/rsync/mongoose.c

// Copyright (c) 2004-2013 Sergey Lyubka

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

// THE SOFTWARE.



#if defined(_WIN32)

#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005

#else

#ifdef __linux__

#define _XOPEN_SOURCE 600     // For flockfile() on Linux

#endif

#define _LARGEFILE_SOURCE     // Enable 64-bit file offsets

#define __STDC_FORMAT_MACROS  // <inttypes.h> wants this for C++

#define __STDC_LIMIT_MACROS   // C++ wants that for INT64_MAX

#endif



#if defined (_MSC_VER)

// conditional expression is constant: introduced by FD_SET(..)

#pragma warning (disable : 4127)

// non-constant aggregate initializer: issued due to missing C99 support

#pragma warning (disable : 4204)

#endif



// Disable WIN32_LEAN_AND_MEAN.

// This makes windows.h always include winsock2.h

#ifdef WIN32_LEAN_AND_MEAN

#undef WIN32_LEAN_AND_MEAN

#endif



#if defined(__SYMBIAN32__)

#define NO_SSL // SSL is not supported

#define NO_CGI // CGI is not supported

#define PATH_MAX FILENAME_MAX

#endif // __SYMBIAN32__



#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE

#include <sys/types.h>

#include <sys/stat.h>

#include <errno.h>

#include <signal.h>

#include <fcntl.h>

#endif // !_WIN32_WCE



#include <time.h>

#include <stdlib.h>

#include <stdarg.h>

#include <assert.h>

#include <string.h>

#include <ctype.h>

#include <limits.h>

#include <stddef.h>

#include <stdio.h>

#include <sys/ioctl.h>

int mg_in;

int mg_out;





#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific

#define _WIN32_WINNT 0x0400 // To make it link in VS2005

#include <windows.h>



#ifndef PATH_MAX

#define PATH_MAX MAX_PATH

#endif



#ifndef _WIN32_WCE

#include <process.h>

#include <direct.h>

#include <io.h>

#else // _WIN32_WCE

#define NO_CGI // WinCE has no pipes



typedef long off_t;



#define errno   GetLastError()

#define strerror(x)  _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)

#endif // _WIN32_WCE



#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \

			((uint64_t)((uint32_t)(hi))) << 32))

#define RATE_DIFF 10000000 // 100 nsecs

#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)

#define SYS2UNIX_TIME(lo, hi) \

	(time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)



// Visual Studio 6 does not know __func__ or __FUNCTION__

// The rest of MS compilers use __FUNCTION__, not C99 __func__

// Also use _strtoui64 on modern M$ compilers

#if defined(_MSC_VER) && _MSC_VER < 1300

#define STRX(x) #x

#define STR(x) STRX(x)

#define __func__ __FILE__ ":" STR(__LINE__)

#define strtoull(x, y, z) strtoul(x, y, z)

#define strtoll(x, y, z) strtol(x, y, z)

#else

#define __func__  __FUNCTION__

#define strtoull(x, y, z) _strtoui64(x, y, z)

#define strtoll(x, y, z) _strtoi64(x, y, z)

#endif // _MSC_VER



#define ERRNO   GetLastError()

#define NO_SOCKLEN_T

#define SSL_LIB   "ssleay32.dll"

#define CRYPTO_LIB  "libeay32.dll"

#define O_NONBLOCK  0

#if !defined(EWOULDBLOCK)

#define EWOULDBLOCK  WSAEWOULDBLOCK

#endif // !EWOULDBLOCK

#define _POSIX_

#define INT64_FMT  "I64d"



#define WINCDECL __cdecl

#define SHUT_WR 1

#define snprintf _snprintf

#define vsnprintf _vsnprintf

#define mg_sleep(x) Sleep(x)



#define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)

#define popen(x, y) _popen(x, y)

#define pclose(x) _pclose(x)

#define close(x) _close(x)

#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))

#define RTLD_LAZY  0

#define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z))

#define fdopen(x, y) _fdopen((x), (y))

#define write(x, y, z) _write((x), (y), (unsigned) z)

#define read(x, y, z) _read((x), (y), (unsigned) z)

#define flockfile(x) EnterCriticalSection(&global_log_file_lock)

#define funlockfile(x) LeaveCriticalSection(&global_log_file_lock)

#define sleep(x) Sleep((x) * 1000)

#define va_copy(x, y) x = y



#if !defined(fileno)

#define fileno(x) _fileno(x)

#endif // !fileno MINGW #defines fileno



typedef HANDLE pthread_mutex_t;

typedef struct {HANDLE signal, broadcast;} pthread_cond_t;

typedef DWORD pthread_t;

#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.



static int pthread_mutex_lock(pthread_mutex_t *);

static int pthread_mutex_unlock(pthread_mutex_t *);

static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);

struct file;

static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);



#if defined(HAVE_STDINT)

#include <stdint.h>

#else

typedef unsigned int  uint32_t;

typedef unsigned short  uint16_t;

typedef unsigned __int64 uint64_t;

typedef __int64   int64_t;

#define INT64_MAX  9223372036854775807

#endif // HAVE_STDINT



// POSIX dirent interface

struct dirent {

	char d_name[PATH_MAX];

};



typedef struct DIR {

	HANDLE   handle;

	WIN32_FIND_DATAW info;

	struct dirent  result;

} DIR;



#ifndef HAS_POLL

struct pollfd {

	int fd;

	short events;

	short revents;

};

#define POLLIN 1

#endif





// Mark required libraries

#pragma comment(lib, "Ws2_32.lib")



#else    // UNIX  specific

#include <sys/wait.h>

#include <sys/socket.h>

#include <sys/poll.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <sys/time.h>

#include <stdint.h>

#include <inttypes.h>

#include <netdb.h>



#include <pwd.h>

#include <unistd.h>

#include <dirent.h>

#if !defined(NO_SSL_DL) && !defined(NO_SSL)

#include <dlfcn.h>

#endif

#include <pthread.h>

#if defined(__MACH__)

#define SSL_LIB   "libssl.dylib"

#define CRYPTO_LIB  "libcrypto.dylib"

#else

#if !defined(SSL_LIB)

#define SSL_LIB   "libssl.so"

#endif

#if !defined(CRYPTO_LIB)

#define CRYPTO_LIB  "libcrypto.so"

#endif

#endif

#ifndef O_BINARY

#define O_BINARY  0

#endif // O_BINARY

#define closesocket(a) close(a)

#define mg_mkdir(x, y) mkdir(x, y)

#define mg_remove(x) remove(x)

#define mg_rename(x, y) rename(x, y)

#define mg_sleep(x) usleep((x) * 1000)

#define ERRNO errno

#define INVALID_SOCKET (-1)

#define INT64_FMT PRId64

typedef int SOCKET;

#define WINCDECL



#endif // End of Windows and UNIX specific includes



#include "mongoose.h"



#ifdef USE_LUA

#include <lua.h>

#include <lauxlib.h>

#endif



#define MONGOOSE_VERSION "3.8"

#define PASSWORDS_FILE_NAME ".htpasswd"

#define CGI_ENVIRONMENT_SIZE 4096

#define MAX_CGI_ENVIR_VARS 64

#define MG_BUF_LEN 8192

#define MAX_REQUEST_SIZE 16384

#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))



#ifdef _WIN32

static CRITICAL_SECTION global_log_file_lock;

static pthread_t pthread_self(void) {

	return GetCurrentThreadId();

}

#endif // _WIN32



#ifdef DEBUG_TRACE

#undef DEBUG_TRACE

#define DEBUG_TRACE(x)

#else

#if defined(DEBUG)

#define DEBUG_TRACE(x) do { \

	flockfile(stdout); \

	printf("*** %lu.%p.%s.%d: ", \

			(unsigned long) time(NULL), (void *) pthread_self(), \

			__func__, __LINE__); \

	printf x; \

	putchar('\n'); \

	fflush(stdout); \

	funlockfile(stdout); \

} while (0)

#else

#define DEBUG_TRACE(x)

#endif // DEBUG

#endif // DEBUG_TRACE



// Darwin prior to 7.0 and Win32 do not have socklen_t

#ifdef NO_SOCKLEN_T

typedef int socklen_t;

#endif // NO_SOCKLEN_T

#define _DARWIN_UNLIMITED_SELECT



#if !defined(MSG_NOSIGNAL)

#define MSG_NOSIGNAL 0

#endif



#if !defined(SOMAXCONN)

#define SOMAXCONN 100

#endif



#if !defined(PATH_MAX)

#define PATH_MAX 4096

#endif



static const char *http_500_error = "Internal Server Error";



#if defined(NO_SSL_DL)

#include <openssl/ssl.h>

#else

// SSL loaded dynamically from DLL.

// I put the prototypes here to be independent from OpenSSL source installation.

typedef struct ssl_st SSL;

typedef struct ssl_method_st SSL_METHOD;

typedef struct ssl_ctx_st SSL_CTX;



struct ssl_func {

	const char *name;   // SSL function name

	void  (*ptr)(void); // Function pointer

};



#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)

#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)

#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)

#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)

#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)

#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)

#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)

#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)

#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)

#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)

#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)

#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \

				const char *, int)) ssl_sw[11].ptr)

#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \

				const char *, int)) ssl_sw[12].ptr)

#define SSL_CTX_set_default_passwd_cb \

	(* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)

#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)

#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)

#define SSL_CTX_use_certificate_chain_file \

	(* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)

#define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)

#define SSL_pending (* (int (*)(SSL *)) ssl_sw[18].ptr)

#define SSL_CTX_set_verify (* (void (*)(SSL_CTX *, int, int)) ssl_sw[19].ptr)



#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)

#define CRYPTO_set_locking_callback \

	(* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)

#define CRYPTO_set_id_callback \

	(* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)

#define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)

#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)



// set_ssl_option() function updates this array.

// It loads SSL library dynamically and changes NULLs to the actual addresses

// of respective functions. The macros above (like SSL_connect()) are really

// just calling these functions indirectly via the pointer.

static struct ssl_func ssl_sw[] = {

	{"SSL_free",   NULL},

	{"SSL_accept",   NULL},

	{"SSL_connect",   NULL},

	{"SSL_read",   NULL},

	{"SSL_write",   NULL},

	{"SSL_get_error",  NULL},

	{"SSL_set_fd",   NULL},

	{"SSL_new",   NULL},

	{"SSL_CTX_new",   NULL},

	{"SSLv23_server_method", NULL},

	{"SSL_library_init",  NULL},

	{"SSL_CTX_use_PrivateKey_file", NULL},

	{"SSL_CTX_use_certificate_file",NULL},

	{"SSL_CTX_set_default_passwd_cb",NULL},

	{"SSL_CTX_free",  NULL},

	{"SSL_load_error_strings", NULL},

	{"SSL_CTX_use_certificate_chain_file", NULL},

	{"SSLv23_client_method", NULL},

	{"SSL_pending", NULL},

	{"SSL_CTX_set_verify", NULL},

	{NULL,    NULL}

};



// Similar array as ssl_sw. These functions could be located in different lib.

#if !defined(NO_SSL)

static struct ssl_func crypto_sw[] = {

	{"CRYPTO_num_locks",  NULL},

	{"CRYPTO_set_locking_callback", NULL},

	{"CRYPTO_set_id_callback", NULL},

	{"ERR_get_error",  NULL},

	{"ERR_error_string", NULL},

	{NULL,    NULL}

};

#endif // NO_SSL

#endif // NO_SSL_DL



static const char *month_names[] = {

	"Jan", "Feb", "Mar", "Apr", "May", "Jun",

	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"

};



// Unified socket address. For IPv6 support, add IPv6 address structure

// in the union u.

union usa {

	struct sockaddr sa;

	struct sockaddr_in sin;

#if defined(USE_IPV6)

	struct sockaddr_in6 sin6;

#endif

};



// Describes a string (chunk of memory).

struct vec {

	const char *ptr;

	size_t len;

};



struct file {

	int is_directory;

	time_t modification_time;

	int64_t size;

	FILE *fp;

	const char *membuf;   // Non-NULL if file data is in memory

};

#define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL}



// Describes listening socket, or socket which was accept()-ed by the master

// thread and queued for future handling by the worker thread.

struct socket {

	SOCKET sock;          // Listening socket

	union usa lsa;        // Local socket address

	union usa rsa;        // Remote socket address

	unsigned is_ssl:1;    // Is port SSL-ed

	unsigned ssl_redir:1; // Is port supposed to redirect everything to SSL port

};



// NOTE(lsm): this enum shoulds be in sync with the config_options below.

enum {

	CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,

	PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,

	ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,

	GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,

	EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,

	NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, REQUEST_TIMEOUT,

	NUM_OPTIONS

};



static const char *config_options[] = {

	"C", "cgi_pattern", "**.cgi$|**.pl$|**.php$",

	"E", "cgi_environment", NULL,

	"G", "put_delete_auth_file", NULL,

	"I", "cgi_interpreter", NULL,

	"P", "protect_uri", NULL,

	"R", "authentication_domain", "mydomain.com",

	"S", "ssi_pattern", "**.shtml$|**.shtm$",

	"T", "throttle", NULL,

	"a", "access_log_file", NULL,

	"d", "enable_directory_listing", "yes",

	"e", "error_log_file", NULL,

	"g", "global_auth_file", NULL,

	"i", "index_files",

	"index.html,index.htm,index.cgi,index.shtml,index.php,index.lp",

	"k", "enable_keep_alive", "no",

	"l", "access_control_list", NULL,

	"m", "extra_mime_types", NULL,

	"p", "listening_ports", "8080",

	"r", "document_root",  ".",

	"s", "ssl_certificate", NULL,

	"t", "num_threads", "50",

	"u", "run_as_user", NULL,

	"w", "url_rewrite_patterns", NULL,

	"x", "hide_files_patterns", NULL,

	"z", "request_timeout_ms", "30000",

	NULL

};

#define ENTRIES_PER_CONFIG_OPTION 3



struct mg_context {

	volatile int stop_flag;         // Should we stop event loop

	SSL_CTX *ssl_ctx;               // SSL context

	char *config[NUM_OPTIONS];      // Mongoose configuration parameters

	struct mg_callbacks callbacks;  // User-defined callback function

	void *user_data;                // User-defined data



	struct socket *listening_sockets;

	int num_listening_sockets;



	volatile int num_threads;  // Number of threads

	pthread_mutex_t mutex;     // Protects (max|num)_threads

	pthread_cond_t  cond;      // Condvar for tracking workers terminations



	struct socket queue[20];   // Accepted sockets

	volatile int sq_head;      // Head of the socket queue

	volatile int sq_tail;      // Tail of the socket queue

	pthread_cond_t sq_full;    // Signaled when socket is produced

	pthread_cond_t sq_empty;   // Signaled when socket is consumed

};



struct mg_connection {

	struct mg_request_info request_info;

	struct mg_context *ctx;

	SSL *ssl;                   // SSL descriptor

	SSL_CTX *client_ssl_ctx;    // SSL context for client connections

	struct socket client;       // Connected client

	time_t birth_time;          // Time when request was received

	int64_t num_bytes_sent;     // Total bytes sent to client

	int64_t content_len;        // Content-Length header value

	int64_t consumed_content;   // How many bytes of content have been read

	char *buf;                  // Buffer for received data

	char *path_info;            // PATH_INFO part of the URL

	int must_close;             // 1 if connection must be closed

	int buf_size;               // Buffer size

	int request_len;            // Size of the request + headers in a buffer

	int data_len;               // Total size of data in a buffer

	int status_code;            // HTTP reply status code, e.g. 200

	int throttle;               // Throttling, bytes/sec. <= 0 means no throttle

	time_t last_throttle_time;  // Last time throttled data was sent

	int64_t last_throttle_bytes;// Bytes sent this second

};



const char **mg_get_valid_option_names(void) {

	return config_options;

}



static int is_file_in_memory(struct mg_connection *conn, const char *path,

		struct file *filep) {

	size_t size = 0;

	if ((filep->membuf = conn->ctx->callbacks.open_file == NULL ? NULL :

				conn->ctx->callbacks.open_file(conn, path, &size)) != NULL) {

		// NOTE: override filep->size only on success. Otherwise, it might break

		// constructs like if (!mg_stat() || !mg_fopen()) ...

		filep->size = size;

	}

	return filep->membuf != NULL;

}



static int is_file_opened(const struct file *filep) {

	return filep->membuf != NULL || filep->fp != NULL;

}



static int mg_fopen(struct mg_connection *conn, const char *path,

		const char *mode, struct file *filep) {

	if (!is_file_in_memory(conn, path, filep)) {

#ifdef _WIN32

		wchar_t wbuf[PATH_MAX], wmode[20];

		to_unicode(path, wbuf, ARRAY_SIZE(wbuf));

		MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));

		filep->fp = _wfopen(wbuf, wmode);

#else

		filep->fp = fopen(path, mode);

#endif

	}



	return is_file_opened(filep);

}



static void mg_fclose(struct file *filep) {

	if (filep != NULL && filep->fp != NULL) {

		fclose(filep->fp);

	}

}



static int get_option_index(const char *name) {

	int i;



	for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {

		if (strcmp(config_options[i], name) == 0 ||

				strcmp(config_options[i + 1], name) == 0) {

			return i / ENTRIES_PER_CONFIG_OPTION;

		}

	}

	return -1;

}



const char *mg_get_option(const struct mg_context *ctx, const char *name) {

	int i;

	if ((i = get_option_index(name)) == -1) {

		return NULL;

	} else if (ctx->config[i] == NULL) {

		return "";

	} else {

		return ctx->config[i];

	}

}



static void sockaddr_to_string(char *buf, size_t len,

		const union usa *usa) {

	buf[0] = '\0';

#if defined(USE_IPV6)

	inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?

			(void *) &usa->sin.sin_addr :

			(void *) &usa->sin6.sin6_addr, buf, len);

#elif defined(_WIN32)

	// Only Windoze Vista (and newer) have inet_ntop()

	strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);

#else

	inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);

#endif

}



static void cry(struct mg_connection *conn,

		PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);



// Print error message to the opened error log stream.

static void cry(struct mg_connection *conn, const char *fmt, ...) {

	char buf[MG_BUF_LEN], src_addr[20];

	va_list ap;

	FILE *fp;

	time_t timestamp;



	va_start(ap, fmt);

	(void) vsnprintf(buf, sizeof(buf), fmt, ap);

	va_end(ap);



	// Do not lock when getting the callback value, here and below.

	// I suppose this is fine, since function cannot disappear in the

	// same way string option can.

	if (conn->ctx->callbacks.log_message == NULL ||

			conn->ctx->callbacks.log_message(conn, buf) == 0) {

		fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :

			fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");



		if (fp != NULL) {

			flockfile(fp);

			timestamp = time(NULL);



			sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);

			fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,

					src_addr);



			if (conn->request_info.request_method != NULL) {

				fprintf(fp, "%s %s: ", conn->request_info.request_method,

						conn->request_info.uri);

			}



			fprintf(fp, "%s", buf);

			fputc('\n', fp);

			funlockfile(fp);

			fclose(fp);

		}

	}

}



// Return fake connection structure. Used for logging, if connection

// is not applicable at the moment of logging.

static struct mg_connection *fc(struct mg_context *ctx) {

	static struct mg_connection fake_connection;

	fake_connection.ctx = ctx;

	return &fake_connection;

}



const char *mg_version(void) {

	return MONGOOSE_VERSION;

}



struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {

	return &conn->request_info;

}



static void mg_strlcpy(register char *dst, register const char *src, size_t n) {

	for (; *src != '\0' && n > 1; n--) {

		*dst++ = *src++;

	}

	*dst = '\0';

}



static int lowercase(const char *s) {

	return tolower(* (const unsigned char *) s);

}



static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {

	int diff = 0;



	if (len > 0)

		do {

			diff = lowercase(s1++) - lowercase(s2++);

		} while (diff == 0 && s1[-1] != '\0' && --len > 0);



	return diff;

}



static int mg_strcasecmp(const char *s1, const char *s2) {

	int diff;



	do {

		diff = lowercase(s1++) - lowercase(s2++);

	} while (diff == 0 && s1[-1] != '\0');



	return diff;

}



static char * mg_strndup(const char *ptr, size_t len) {

	char *p;



	if ((p = (char *) malloc(len + 1)) != NULL) {

		mg_strlcpy(p, ptr, len + 1);

	}



	return p;

}



static char * mg_strdup(const char *str) {

	return mg_strndup(str, strlen(str));

}



// Like snprintf(), but never returns negative value, or a value

// that is larger than a supplied buffer.

// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability

// in his audit report.

static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,

		const char *fmt, va_list ap) {

	int n;



	if (buflen == 0)

		return 0;



	n = vsnprintf(buf, buflen, fmt, ap);



	if (n < 0) {

		cry(conn, "vsnprintf error");

		n = 0;

	} else if (n >= (int) buflen) {

		cry(conn, "truncating vsnprintf buffer: [%.*s]",

				n > 200 ? 200 : n, buf);

		n = (int) buflen - 1;

	}

	buf[n] = '\0';



	return n;

}



static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,

		PRINTF_FORMAT_STRING(const char *fmt), ...)

	PRINTF_ARGS(4, 5);



	static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,

			const char *fmt, ...) {

		va_list ap;

		int n;



		va_start(ap, fmt);

		n = mg_vsnprintf(conn, buf, buflen, fmt, ap);

		va_end(ap);



		return n;

	}



// Skip the characters until one of the delimiters characters found.

// 0-terminate resulting word. Skip the delimiter and following whitespaces.

// Advance pointer to buffer to the next word. Return found 0-terminated word.

// Delimiters can be quoted with quotechar.

static char *skip_quoted(char **buf, const char *delimiters,

		const char *whitespace, char quotechar) {

	char *p, *begin_word, *end_word, *end_whitespace;



	begin_word = *buf;

	end_word = begin_word + strcspn(begin_word, delimiters);



	// Check for quotechar

	if (end_word > begin_word) {

		p = end_word - 1;

		while (*p == quotechar) {

			// If there is anything beyond end_word, copy it

			if (*end_word == '\0') {

				*p = '\0';

				break;

			} else {

				size_t end_off = strcspn(end_word + 1, delimiters);

				memmove (p, end_word, end_off + 1);

				p += end_off; // p must correspond to end_word - 1

				end_word += end_off + 1;

			}

		}

		for (p++; p < end_word; p++) {

			*p = '\0';

		}

	}



	if (*end_word == '\0') {

		*buf = end_word;

	} else {

		end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);



		for (p = end_word; p < end_whitespace; p++) {

			*p = '\0';

		}



		*buf = end_whitespace;

	}



	return begin_word;

}



// Simplified version of skip_quoted without quote char

// and whitespace == delimiters

static char *skip(char **buf, const char *delimiters) {

	return skip_quoted(buf, delimiters, delimiters, 0);

}





// Return HTTP header value, or NULL if not found.

static const char *get_header(const struct mg_request_info *ri,

		const char *name) {

	int i;



	for (i = 0; i < ri->num_headers; i++)

		if (!mg_strcasecmp(name, ri->http_headers[i].name))

			return ri->http_headers[i].value;



	return NULL;

}



const char *mg_get_header(const struct mg_connection *conn, const char *name) {

	return get_header(&conn->request_info, name);

}



// A helper function for traversing a comma separated list of values.

// It returns a list pointer shifted to the next value, or NULL if the end

// of the list found.

// Value is stored in val vector. If value has form "x=y", then eq_val

// vector is initialized to point to the "y" part, and val vector length

// is adjusted to point only to "x".

static const char *next_option(const char *list, struct vec *val,

		struct vec *eq_val) {

	if (list == NULL || *list == '\0') {

		// End of the list

		list = NULL;

	} else {

		val->ptr = list;

		if ((list = strchr(val->ptr, ',')) != NULL) {

			// Comma found. Store length and shift the list ptr

			val->len = list - val->ptr;

			list++;

		} else {

			// This value is the last one

			list = val->ptr + strlen(val->ptr);

			val->len = list - val->ptr;

		}



		if (eq_val != NULL) {

			// Value has form "x=y", adjust pointers and lengths

			// so that val points to "x", and eq_val points to "y".

			eq_val->len = 0;

			eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);

			if (eq_val->ptr != NULL) {

				eq_val->ptr++;  // Skip over '=' character

				eq_val->len = val->ptr + val->len - eq_val->ptr;

				val->len = (eq_val->ptr - val->ptr) - 1;

			}

		}

	}



	return list;

}



static int match_prefix(const char *pattern, int pattern_len, const char *str) {

	const char *or_str;

	int i, j, len, res;



	if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {

		res = match_prefix(pattern, or_str - pattern, str);

		return res > 0 ? res :

			match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);

	}



	i = j = 0;

	res = -1;

	for (; i < pattern_len; i++, j++) {

		if (pattern[i] == '?' && str[j] != '\0') {

			continue;

		} else if (pattern[i] == '$') {

			return str[j] == '\0' ? j : -1;

		} else if (pattern[i] == '*') {

			i++;

			if (pattern[i] == '*') {

				i++;

				len = (int) strlen(str + j);

			} else {

				len = (int) strcspn(str + j, "/");

			}

			if (i == pattern_len) {

				return j + len;

			}

			do {

				res = match_prefix(pattern + i, pattern_len - i, str + j + len);

			} while (res == -1 && len-- > 0);

			return res == -1 ? -1 : j + res + len;

		} else if (pattern[i] != str[j]) {

			return -1;

		}

	}

	return j;

}



// HTTP 1.1 assumes keep alive if "Connection:" header is not set

// This function must tolerate situations when connection info is not

// set up, for example if request parsing failed.

static int should_keep_alive(const struct mg_connection *conn) {

	const char *http_version = conn->request_info.http_version;

	const char *header = mg_get_header(conn, "Connection");

	if (conn->must_close ||

			conn->status_code == 401 ||

			mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||

			(header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||

			(header == NULL && http_version && strcmp(http_version, "1.1"))) {

		return 0;

	}

	return 1;

}



static const char *suggest_connection_header(const struct mg_connection *conn) {

	return should_keep_alive(conn) ? "keep-alive" : "close";

}



static void send_http_error(struct mg_connection *, int, const char *,

		PRINTF_FORMAT_STRING(const char *fmt), ...)

	PRINTF_ARGS(4, 5);





	static void send_http_error(struct mg_connection *conn, int status,

			const char *reason, const char *fmt, ...) {

		char buf[MG_BUF_LEN];

		va_list ap;

		int len = 0;



		conn->status_code = status;

		if (conn->ctx->callbacks.http_error == NULL ||

				conn->ctx->callbacks.http_error(conn, status)) {

			buf[0] = '\0';



			// Errors 1xx, 204 and 304 MUST NOT send a body

			if (status > 199 && status != 204 && status != 304) {

				len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);

				buf[len++] = '\n';



				va_start(ap, fmt);

				len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);

				va_end(ap);

			}

			DEBUG_TRACE(("[%s]", buf));



			mg_printf(conn, "HTTP/1.1 %d %s\r\n"

					"Content-Length: %d\r\n"

					"Connection: %s\r\n\r\n", status, reason, len,

					suggest_connection_header(conn));

			conn->num_bytes_sent += mg_printf(conn, "%s", buf);

		}

	}



#if defined(_WIN32) && !defined(__SYMBIAN32__)

static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {

	unused = NULL;

	*mutex = CreateMutex(NULL, FALSE, NULL);

	return *mutex == NULL ? -1 : 0;

}



static int pthread_mutex_destroy(pthread_mutex_t *mutex) {

	return CloseHandle(*mutex) == 0 ? -1 : 0;

}



static int pthread_mutex_lock(pthread_mutex_t *mutex) {

	return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;

}



static int pthread_mutex_unlock(pthread_mutex_t *mutex) {

	return ReleaseMutex(*mutex) == 0 ? -1 : 0;

}



static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {

	unused = NULL;

	cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);

	cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);

	return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;

}



static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {

	HANDLE handles[] = {cv->signal, cv->broadcast};

	ReleaseMutex(*mutex);

	WaitForMultipleObjects(2, handles, FALSE, INFINITE);

	return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;

}



static int pthread_cond_signal(pthread_cond_t *cv) {

	return SetEvent(cv->signal) == 0 ? -1 : 0;

}



static int pthread_cond_broadcast(pthread_cond_t *cv) {

	// Implementation with PulseEvent() has race condition, see

	// http://www.cs.wustl.edu/~schmidt/win32-cv-1.html

	return PulseEvent(cv->broadcast) == 0 ? -1 : 0;

}



static int pthread_cond_destroy(pthread_cond_t *cv) {

	return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;

}



// For Windows, change all slashes to backslashes in path names.

static void change_slashes_to_backslashes(char *path) {

	int i;



	for (i = 0; path[i] != '\0'; i++) {

		if (path[i] == '/')

			path[i] = '\\';

		// i > 0 check is to preserve UNC paths, like \\server\file.txt

		if (path[i] == '\\' && i > 0)

			while (path[i + 1] == '\\' || path[i + 1] == '/')

				(void) memmove(path + i + 1,

						path + i + 2, strlen(path + i + 1));

	}

}



// Encode 'path' which is assumed UTF-8 string, into UNICODE string.

// wbuf and wbuf_len is a target buffer and its length.

static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {

	char buf[PATH_MAX], buf2[PATH_MAX], *p;



	mg_strlcpy(buf, path, sizeof(buf));

	change_slashes_to_backslashes(buf);



	// Point p to the end of the file name

	p = buf + strlen(buf) - 1;



	// Convert to Unicode and back. If doubly-converted string does not

	// match the original, something is fishy, reject.

	memset(wbuf, 0, wbuf_len * sizeof(wchar_t));

	MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);

	WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),

			NULL, NULL);

	if (strcmp(buf, buf2) != 0) {

		wbuf[0] = L'\0';

	}

}



#if defined(_WIN32_WCE)

static time_t time(time_t *ptime) {

	time_t t;

	SYSTEMTIME st;

	FILETIME ft;



	GetSystemTime(&st);

	SystemTimeToFileTime(&st, &ft);

	t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);



	if (ptime != NULL) {

		*ptime = t;

	}



	return t;

}



static struct tm *localtime(const time_t *ptime, struct tm *ptm) {

	int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;

	FILETIME ft, lft;

	SYSTEMTIME st;

	TIME_ZONE_INFORMATION tzinfo;



	if (ptm == NULL) {

		return NULL;

	}



	* (int64_t *) &ft = t;

	FileTimeToLocalFileTime(&ft, &lft);

	FileTimeToSystemTime(&lft, &st);

	ptm->tm_year = st.wYear - 1900;

	ptm->tm_mon = st.wMonth - 1;

	ptm->tm_wday = st.wDayOfWeek;

	ptm->tm_mday = st.wDay;

	ptm->tm_hour = st.wHour;

	ptm->tm_min = st.wMinute;

	ptm->tm_sec = st.wSecond;

	ptm->tm_yday = 0; // hope nobody uses this

	ptm->tm_isdst =

		GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;



	return ptm;

}



static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {

	// FIXME(lsm): fix this.

	return localtime(ptime, ptm);

}



static size_t strftime(char *dst, size_t dst_size, const char *fmt,

		const struct tm *tm) {

	(void) snprintf(dst, dst_size, "implement strftime() for WinCE");

	return 0;

}

#endif



static int mg_rename(const char* oldname, const char* newname) {

	wchar_t woldbuf[PATH_MAX];

	wchar_t wnewbuf[PATH_MAX];



	to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));

	to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));



	return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;

}



// Windows happily opens files with some garbage at the end of file name.

// For example, fopen("a.cgi    ", "r") on Windows successfully opens

// "a.cgi", despite one would expect an error back.

// This function returns non-0 if path ends with some garbage.

static int path_cannot_disclose_cgi(const char *path) {

	static const char *allowed_last_characters = "_-";

	int last = path[strlen(path) - 1];

	return isalnum(last) || strchr(allowed_last_characters, last) != NULL;

}



static int mg_stat(struct mg_connection *conn, const char *path,

		struct file *filep) {

	wchar_t wbuf[PATH_MAX];

	WIN32_FILE_ATTRIBUTE_DATA info;



	if (!is_file_in_memory(conn, path, filep)) {

		to_unicode(path, wbuf, ARRAY_SIZE(wbuf));

		if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {

			filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);

			filep->modification_time = SYS2UNIX_TIME(

					info.ftLastWriteTime.dwLowDateTime,

					info.ftLastWriteTime.dwHighDateTime);

			filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;

			// If file name is fishy, reset the file structure and return error.

			// Note it is important to reset, not just return the error, cause

			// functions like is_file_opened() check the struct.

			if (!filep->is_directory && !path_cannot_disclose_cgi(path)) {

				memset(filep, 0, sizeof(*filep));

			}

		}

	}



	return filep->membuf != NULL || filep->modification_time != 0;

}



static int mg_remove(const char *path) {

	wchar_t wbuf[PATH_MAX];

	to_unicode(path, wbuf, ARRAY_SIZE(wbuf));

	return DeleteFileW(wbuf) ? 0 : -1;

}



static int mg_mkdir(const char *path, int mode) {

	char buf[PATH_MAX];

	wchar_t wbuf[PATH_MAX];



	mode = 0; // Unused

	mg_strlcpy(buf, path, sizeof(buf));

	change_slashes_to_backslashes(buf);



	(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf));



	return CreateDirectoryW(wbuf, NULL) ? 0 : -1;

}



// Implementation of POSIX opendir/closedir/readdir for Windows.

static DIR * opendir(const char *name) {

	DIR *dir = NULL;

	wchar_t wpath[PATH_MAX];

	DWORD attrs;



	if (name == NULL) {

		SetLastError(ERROR_BAD_ARGUMENTS);

	} else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {

		SetLastError(ERROR_NOT_ENOUGH_MEMORY);

	} else {

		to_unicode(name, wpath, ARRAY_SIZE(wpath));

		attrs = GetFileAttributesW(wpath);

		if (attrs != 0xFFFFFFFF &&

				((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {

			(void) wcscat(wpath, L"\\*");

			dir->handle = FindFirstFileW(wpath, &dir->info);

			dir->result.d_name[0] = '\0';

		} else {

			free(dir);

			dir = NULL;

		}

	}



	return dir;

}



static int closedir(DIR *dir) {

	int result = 0;



	if (dir != NULL) {

		if (dir->handle != INVALID_HANDLE_VALUE)

			result = FindClose(dir->handle) ? 0 : -1;



		free(dir);

	} else {

		result = -1;

		SetLastError(ERROR_BAD_ARGUMENTS);

	}



	return result;

}



static struct dirent *readdir(DIR *dir) {

	struct dirent *result = 0;



	if (dir) {

		if (dir->handle != INVALID_HANDLE_VALUE) {

			result = &dir->result;

			(void) WideCharToMultiByte(CP_UTF8, 0,

					dir->info.cFileName, -1, result->d_name,

					sizeof(result->d_name), NULL, NULL);



			if (!FindNextFileW(dir->handle, &dir->info)) {

				(void) FindClose(dir->handle);

				dir->handle = INVALID_HANDLE_VALUE;

			}



		} else {

			SetLastError(ERROR_FILE_NOT_FOUND);

		}

	} else {

		SetLastError(ERROR_BAD_ARGUMENTS);

	}



	return result;

}



#ifndef HAVE_POLL

static int poll(struct pollfd *pfd, int n, int milliseconds) {

	struct timeval tv;

	fd_set set;

	int i, result;



	tv.tv_sec = milliseconds / 1000;

	tv.tv_usec = (milliseconds % 1000) * 1000;

	FD_ZERO(&set);



	for (i = 0; i < n; i++) {

		FD_SET((SOCKET) pfd[i].fd, &set);

		pfd[i].revents = 0;

	}



	if ((result = select(0, &set, NULL, NULL, &tv)) > 0) {

		for (i = 0; i < n; i++) {

			if (FD_ISSET(pfd[i].fd, &set)) {

				pfd[i].revents = POLLIN;

			}

		}

	}



	return result;

}

#endif // HAVE_POLL



#define set_close_on_exec(x) // No FD_CLOEXEC on Windows



int mg_start_thread(mg_thread_func_t f, void *p) {

	return _beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;

}



static HANDLE dlopen(const char *dll_name, int flags) {

	wchar_t wbuf[PATH_MAX];

	flags = 0; // Unused

	to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));

	return LoadLibraryW(wbuf);

}



#if !defined(NO_CGI)

#define SIGKILL 0

static int kill(pid_t pid, int sig_num) {

	(void) TerminateProcess(pid, sig_num);

	(void) CloseHandle(pid);

	return 0;

}



static void trim_trailing_whitespaces(char *s) {

	char *e = s + strlen(s) - 1;

	while (e > s && isspace(* (unsigned char *) e)) {

		*e-- = '\0';

	}

}



static pid_t spawn_process(struct mg_connection *conn, const char *prog,

		char *envblk, char *envp[], int fd_stdin,

		int fd_stdout, const char *dir) {

	HANDLE me;

	char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX],

	     cmdline[PATH_MAX], buf[PATH_MAX];

	struct file file = STRUCT_FILE_INITIALIZER;

	STARTUPINFOA si = { sizeof(si) };

	PROCESS_INFORMATION pi = { 0 };



	envp = NULL; // Unused



	// TODO(lsm): redirect CGI errors to the error log file

	si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;

	si.wShowWindow = SW_HIDE;



	me = GetCurrentProcess();

	DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,

			&si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);

	DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,

			&si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);



	// If CGI file is a script, try to read the interpreter line

	interp = conn->ctx->config[CGI_INTERPRETER];

	if (interp == NULL) {

		buf[0] = buf[1] = '\0';



		// Read the first line of the script into the buffer

		snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);

		if (mg_fopen(conn, cmdline, "r", &file)) {

			p = (char *) file.membuf;

			mg_fgets(buf, sizeof(buf), &file, &p);

			mg_fclose(&file);

			buf[sizeof(buf) - 1] = '\0';

		}



		if (buf[0] == '#' && buf[1] == '!') {

			trim_trailing_whitespaces(buf + 2);

		} else {

			buf[2] = '\0';

		}

		interp = buf + 2;

	}



	if (interp[0] != '\0') {

		GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL);

		interp = full_interp;

	}

	GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL);



	mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s\\%s",

			interp, interp[0] == '\0' ? "" : " ", full_dir, prog);



	DEBUG_TRACE(("Running [%s]", cmdline));

	if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,

				CREATE_NEW_PROCESS_GROUP, envblk, NULL, &si, &pi) == 0) {

		cry(conn, "%s: CreateProcess(%s): %d",

				__func__, cmdline, ERRNO);

		pi.hProcess = (pid_t) -1;

	}



	// Always close these to prevent handle leakage.

	(void) close(fd_stdin);

	(void) close(fd_stdout);



	(void) CloseHandle(si.hStdOutput);

	(void) CloseHandle(si.hStdInput);

	(void) CloseHandle(pi.hThread);



	return (pid_t) pi.hProcess;

}

#endif // !NO_CGI



static int set_non_blocking_mode(SOCKET sock) {

	unsigned long on = 1;

	return ioctlsocket(sock, FIONBIO, &on);

}



#else

static int mg_stat(struct mg_connection *conn, const char *path,

		struct file *filep) {

	struct stat st;



	if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {

		filep->size = st.st_size;

		filep->modification_time = st.st_mtime;

		filep->is_directory = S_ISDIR(st.st_mode);

	} else {

		filep->modification_time = (time_t) 0;

	}



	return filep->membuf != NULL || filep->modification_time != (time_t) 0;

}



static void set_close_on_exec(int fd) {

	fcntl(fd, F_SETFD, FD_CLOEXEC);

}



int mg_start_thread(mg_thread_func_t func, void *param) {

	pthread_t thread_id;

	pthread_attr_t attr;



	(void) pthread_attr_init(&attr);

	(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

	// TODO(lsm): figure out why mongoose dies on Linux if next line is enabled

	// (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);



	return pthread_create(&thread_id, &attr, func, param);

}



#ifndef NO_CGI

static pid_t spawn_process(struct mg_connection *conn, const char *prog,

		char *envblk, char *envp[], int fd_stdin,

		int fd_stdout, const char *dir) {

	pid_t pid;

	const char *interp;



	(void) envblk;



	if ((pid = fork()) == -1) {

		// Parent

		send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));

	} else if (pid == 0) {

		// Child

		if (chdir(dir) != 0) {

			cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));

		} else if (dup2(fd_stdin, 0) == -1) {

			cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));

		} else if (dup2(fd_stdout, 1) == -1) {

			cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));

		} else {

			(void) dup2(fd_stdout, 2);

			(void) close(fd_stdin);

			(void) close(fd_stdout);



			// After exec, all signal handlers are restored to their default values,

			// with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's

			// implementation, SIGCHLD's handler will leave unchanged after exec

			// if it was set to be ignored. Restore it to default action.

			signal(SIGCHLD, SIG_DFL);



			interp = conn->ctx->config[CGI_INTERPRETER];

			if (interp == NULL) {

				(void) execle(prog, prog, NULL, envp);

				cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));

			} else {

				(void) execle(interp, interp, prog, NULL, envp);

				cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,

						strerror(ERRNO));

			}

		}

		exit(EXIT_FAILURE);

	}



	// Parent. Close stdio descriptors

	(void) close(fd_stdin);

	(void) close(fd_stdout);



	return pid;

}

#endif // !NO_CGI



static int set_non_blocking_mode(SOCKET sock) {

	int flags;



	flags = fcntl(sock, F_GETFL, 0);

	(void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);



	return 0;

}

#endif // _WIN32



// Write data to the IO channel - opened file descriptor, socket or SSL

// descriptor. Return number of bytes written.

static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,

		int64_t len) {

	int64_t sent;

	int n, k;

	sent = 0;

	while (sent < len) {



		// How many bytes we send in this iteration

		k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);



#ifndef NO_SSL

		if (ssl != NULL) {

			n = SSL_write(ssl, buf + sent, k);

		} else

#endif

			if (fp != NULL) {

				n = (int) fwrite(buf + sent, 1, (size_t) k, fp);

				if (ferror(fp))

					n = -1;

			} else {

				n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);

			}



		if (n <= 0)

			break;



		sent += n;

	}

	return sent;

}



/*

   char* read_post_data(char *buf)

   {

   int i =0 , count =0 ;

   char *data ; // char data[65536] ; alternate declaration to have more size







   FILE *fp ; fp = fopen("testpd.txt","a");fprintf(fp,"\nbuf->%s\npd-%s",buf,data);

   fclose(fp);

   while (i < strlen (buf))

   {

   if (buf[i] =='\r' && buf[i+1] =='\n' && buf[i+2] =='\r'  && buf[i+3] == '\n' )

   {

   i= i+4 ;

   while ( buf[i] != '\r' && buf[i+1]!='\n' )

   {

   data[count] = buf[i] ;

   count++;

   i++;

   }

   data[i] = '\0';

   break ;

   }

   else{i++;}

   }//end while

//  fprintf(fp,"\nbuf->%s\npd-%s",buf,data);fclose(fp); 

return data;

}*/



char* read_post_data(char* buf, int len)

{

	FILE * fp4;

	char *temp;

	temp = malloc(20);

	fp4 = fopen("testpost.txt","w");

	fprintf(fp4,"In the read_post_data %s", buf);

	//fclose(fp4);

	int i=0, j=0;

	/*while(buf[i] != '\r' && buf[i+1]!= '\n' && buf[i+2]!= '\r' && buf[i+3]!= '\n')

	  i++;

	  i=i+4;

	  while(buf[i] != '\r' && buf[i+1]!= '\n')

	  {

	  temp[j++] = buf[i++];

	  }

	  temp[j] = '\0';*/



	while (i < strlen (buf))

	{

		if (buf[i] =='\r' && buf[i+1] =='\n' && buf[i+2] =='\r'  && buf[i+3] == '\n' )

		{

			i= i+4 ;

			while ( buf[i] != '\r' && buf[i+1]!='\n' )

			{

				temp[j] = buf[i] ;

				j++;

				i++;

			}

			//temp[i] = '\0';

			break ;

		}

		else{i++;}

	}



	fprintf(fp4,"temp: %s", temp);

	fclose(fp4);

	return temp;

}



// Read from IO channel - opened file descriptor, socket, or SSL descriptor.

// Return negative value on error, or number of bytes read on success.

static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {

	int nread;



	const struct mg_request_info *request_info = mg_get_request_info(conn);

	if (fp != NULL) {

		// Use read() instead of fread(), because if we're reading from the CGI

		// pipe, fread() may block until IO buffer is filled up. We cannot afford

		// to block and must pass all read bytes immediately to the client.

		nread = read(fileno(fp), buf, (size_t) len);

#ifndef NO_SSL

	} else if (conn->ssl != NULL) {

		nread = SSL_read(conn->ssl, buf, len);

#endif

	} else {

		nread = recv(conn->client.sock, buf, (size_t) len, 0);

	}

		return conn->ctx->stop_flag ? -1 : nread;

}



int mg_read(struct mg_connection *conn, void *buf, size_t len) {

	int n, buffered_len, nread;

	const char *body;

	FILE *fp8;

	fp8 = fopen("postdata.txt","a");

	nread = 0;

	if (conn->consumed_content < conn->content_len) {

		// Adjust number of bytes to read.

		int64_t to_read = conn->content_len - conn->consumed_content;

		if (to_read < (int64_t) len) {

			len = (size_t) to_read;

		}



		// Return buffered data

		body = conn->buf + conn->request_len + conn->consumed_content;

		buffered_len = &conn->buf[conn->data_len] - body;

		if (buffered_len > 0) {

			if (len < (size_t) buffered_len) {

				buffered_len = (int) len;

			}

			memcpy(buf, body, (size_t) buffered_len);

			len -= buffered_len;

			conn->consumed_content += buffered_len;

			nread += buffered_len;

			buf = (char *) buf + buffered_len;

		}



		// We have returned all buffered data. Read new data from the remote socket.

		while (len > 0) {

			n = pull(NULL, conn, (char *) buf, (int) len);

			if (n < 0) {

				nread = n;  // Propagate the error

				break;

			} else if (n == 0) {

				break;  // No more data to read

			} else {

				buf = (char *) buf + n;

				conn->consumed_content += n;

				nread += n;

				len -= n;

			}

		}

	}

	fprintf(fp8, "%s", body);

	fprintf(fp8, "buf: %s", buf);

	fclose(fp8);

	return nread;

}



int mg_write(struct mg_connection *conn, const void *buf, size_t len) {

	time_t now;

	int64_t n, total, allowed;

	FILE *fp11;

	fp11 = fopen("mgwrite.txt","a");

	fprintf(fp11," buf: %s",conn->buf );

	fclose(fp11);

	if (conn->throttle > 0) {

		if ((now = time(NULL)) != conn->last_throttle_time) {

			conn->last_throttle_time = now;

			conn->last_throttle_bytes = 0;

		}

		allowed = conn->throttle - conn->last_throttle_bytes;

		if (allowed > (int64_t) len) {

			allowed = len;

		}

		if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,

						(int64_t) allowed)) == allowed) {

			buf = (char *) buf + total;

			conn->last_throttle_bytes += total;

			while (total < (int64_t) len && conn->ctx->stop_flag == 0) {

				allowed = conn->throttle > (int64_t) len - total ?

					(int64_t) len - total : conn->throttle;

				if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,

								(int64_t) allowed)) != allowed) {

					break;

				}

				sleep(1);

				conn->last_throttle_bytes = allowed;

				conn->last_throttle_time = time(NULL);

				buf = (char *) buf + n;

				total += n;

			}

		}

	} else {

		total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,

				(int64_t) len);

	}



	return (int) total;

}



// Print message to buffer. If buffer is large enough to hold the message,

// return buffer. If buffer is to small, allocate large enough buffer on heap,

// and return allocated buffer.

static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {

	va_list ap_copy;

	int len;



	// Windows is not standard-compliant, and vsnprintf() returns -1 if

	// buffer is too small. Also, older versions of msvcrt.dll do not have

	// _vscprintf().  However, if size is 0, vsnprintf() behaves correctly.

	// Therefore, we make two passes: on first pass, get required message length.

	// On second pass, actually print the message.

	va_copy(ap_copy, ap);

	len = vsnprintf(NULL, 0, fmt, ap_copy);



	if (len > (int) size &&

			(size = len + 1) > 0 &&

			(*buf = (char *) malloc(size)) == NULL) {

		len = -1;  // Allocation failed, mark failure

	} else {

		va_copy(ap_copy, ap);

		vsnprintf(*buf, size, fmt, ap_copy);

	}



	return len;

}



int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) {

	char mem[MG_BUF_LEN], *buf = mem;

	int len;

	int i = 0;

	FILE *f9;

	f9 = fopen("mgv.txt","a");

	fprintf(f9,"%s", fmt);

	if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {

		while(i < len)

		{

			if(buf[i] == '\r'  && buf[i+1] == '\n'  && buf[i+2] == '\r' && buf[i+3] == '\n')

			{

				break;

			}

			else{i++;}



		} 

		i = i+4;

		while(i< len)

		{

			buf[i] = buf[i] - 1;

			i++;	

		}





		fprintf(f9,"length before: %d", len);

		len = mg_write(conn, buf, (size_t) len);

	}

	if (buf != mem && buf != NULL) {

		free(buf);

	}

	fprintf(f9,"length written: %d",len);

	fclose(f9);

	return len;

}



int mg_printf(struct mg_connection *conn, const char *fmt, ...) {

	va_list ap;

	va_start(ap, fmt);

	return mg_vprintf(conn, fmt, ap);

}



// URL-decode input buffer into destination buffer.

// 0-terminate the destination buffer. Return the length of decoded data.

// form-url-encoded data differs from URI encoding in a way that it

// uses '+' as character for space, see RFC 1866 section 8.2.1

// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt

static int url_decode(const char *src, int src_len, char *dst,

		int dst_len, int is_form_url_encoded) {

	int i, j, a, b;

#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')



	for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {

		if (src[i] == '%' &&

				isxdigit(* (const unsigned char *) (src + i + 1)) &&

				isxdigit(* (const unsigned char *) (src + i + 2))) {

			a = tolower(* (const unsigned char *) (src + i + 1));

			b = tolower(* (const unsigned char *) (src + i + 2));

			dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));

			i += 2;

		} else if (is_form_url_encoded && src[i] == '+') {

			dst[j] = ' ';

		} else {

			dst[j] = src[i];

		}

	}



	dst[j] = '\0'; // Null-terminate the destination



	return i >= src_len ? j : -1;

}



int mg_get_var(const char *data, size_t data_len, const char *name,

		char *dst, size_t dst_len) {

	const char *p, *e, *s;

	size_t name_len;

	int len;



	if (dst == NULL || dst_len == 0) {

		len = -2;

	} else if (data == NULL || name == NULL || data_len == 0) {

		len = -1;

		dst[0] = '\0';

	} else {

		name_len = strlen(name);

		e = data + data_len;

		len = -1;

		dst[0] = '\0';



		// data is "var1=val1&var2=val2...". Find variable first

		for (p = data; p + name_len < e; p++) {

			if ((p == data || p[-1] == '&') && p[name_len] == '=' &&

					!mg_strncasecmp(name, p, name_len)) {



				// Point p to variable value

				p += name_len + 1;



				// Point s to the end of the value

				s = (const char *) memchr(p, '&', (size_t)(e - p));

				if (s == NULL) {

					s = e;

				}

				assert(s >= p);



				// Decode variable into destination buffer

				len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);



				// Redirect error code from -1 to -2 (destination buffer too small).

				if (len == -1) {

					len = -2;

				}

				break;

			}

		}

	}



	return len;

}



int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,

		char *dst, size_t dst_size) {

	const char *s, *p, *end;

	int name_len, len = -1;



	if (dst == NULL || dst_size == 0) {

		len = -2;

	} else if (cookie_name == NULL ||

			(s = mg_get_header(conn, "Cookie")) == NULL) {

		len = -1;

		dst[0] = '\0';

	} else {

		name_len = (int) strlen(cookie_name);

		end = s + strlen(s);

		dst[0] = '\0';



		for (; (s = strstr(s, cookie_name)) != NULL; s += name_len) {

			if (s[name_len] == '=') {

				s += name_len + 1;

				if ((p = strchr(s, ' ')) == NULL)

					p = end;

				if (p[-1] == ';')

					p--;

				if (*s == '"' && p[-1] == '"' && p > s + 1) {

					s++;

					p--;

				}

				if ((size_t) (p - s) < dst_size) {

					len = p - s;

					mg_strlcpy(dst, s, (size_t) len + 1);

				} else {

					len = -2;

				}

				break;

			}

		}

	}

	return len;

}



static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,

		size_t buf_len, struct file *filep) {

	struct vec a, b;

	const char *rewrite, *uri = conn->request_info.uri;

	char *p;

	int match_len;



	// Using buf_len - 1 because memmove() for PATH_INFO may shift part

	// of the path one byte on the right.

	mg_snprintf(conn, buf, buf_len - 1, "%s%s", conn->ctx->config[DOCUMENT_ROOT],

			uri);



	rewrite = conn->ctx->config[REWRITE];

	while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {

		if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {

			mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,

					uri + match_len);

			break;

		}

	}



	if (!mg_stat(conn, buf, filep)) {

		// Support PATH_INFO for CGI scripts.

		for (p = buf + strlen(buf); p > buf + 1; p--) {

			if (*p == '/') {

				*p = '\0';

				if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],

							strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&

						mg_stat(conn, buf, filep)) {

					// Shift PATH_INFO block one character right, e.g.

					//  "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"

					// conn->path_info is pointing to the local variable "path" declared

					// in handle_request(), so PATH_INFO is not valid after

					// handle_request returns.

					conn->path_info = p + 1;

					memmove(p + 2, p + 1, strlen(p + 1) + 1);  // +1 is for trailing \0

					p[1] = '/';

					break;

				} else {

					*p = '/';

				}

			}

		}

	}

}



// Check whether full request is buffered. Return:

//   -1  if request is malformed

//    0  if request is not yet fully buffered

//   >0  actual request length, including last \r\n\r\n

static int get_request_len(const char *buf, int buflen) {

	const char *s, *e;

	int len = 0;



	for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)

		// Control characters are not allowed but >=128 is.

		if (!isprint(* (const unsigned char *) s) && *s != '\r' &&

				*s != '\n' && * (const unsigned char *) s < 128) {

			len = -1;

			break;  // [i_a] abort scan as soon as one malformed character is found;

			// don't let subsequent \r\n\r\n win us over anyhow

		} else if (s[0] == '\n' && s[1] == '\n') {

			len = (int) (s - buf) + 2;

		} else if (s[0] == '\n' && &s[1] < e &&

				s[1] == '\r' && s[2] == '\n') {

			len = (int) (s - buf) + 3;

		}



	return len;

}



// Convert month to the month number. Return -1 on error, or month number

static int get_month_index(const char *s) {

	size_t i;



	for (i = 0; i < ARRAY_SIZE(month_names); i++)

		if (!strcmp(s, month_names[i]))

			return (int) i;



	return -1;

}



static int num_leap_years(int year) {

	return year / 4 - year / 100 + year / 400;

}



// Parse UTC date-time string, and return the corresponding time_t value.

static time_t parse_date_string(const char *datetime) {

	static const unsigned short days_before_month[] = {

		0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334

	};

	char month_str[32];

	int second, minute, hour, day, month, year, leap_days, days;

	time_t result = (time_t) 0;



	if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",

						&day, month_str, &year, &hour, &minute, &second) == 6) ||

				(sscanf(datetime, "%d %3s %d %d:%d:%d",

					&day, month_str, &year, &hour, &minute, &second) == 6) ||

				(sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",

					&day, month_str, &year, &hour, &minute, &second) == 6) ||

				(sscanf(datetime, "%d-%3s-%d %d:%d:%d",

					&day, month_str, &year, &hour, &minute, &second) == 6)) &&

			year > 1970 &&

			(month = get_month_index(month_str)) != -1) {

		leap_days = num_leap_years(year) - num_leap_years(1970);

		year -= 1970;

		days = year * 365 + days_before_month[month] + (day - 1) + leap_days;

		result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;

	}



	return result;

}



// Protect against directory disclosure attack by removing '..',

// excessive '/' and '\' characters

static void remove_double_dots_and_double_slashes(char *s) {

	char *p = s;



	while (*s != '\0') {

		*p++ = *s++;

		if (s[-1] == '/' || s[-1] == '\\') {

			// Skip all following slashes, backslashes and double-dots

			while (s[0] != '\0') {

				if (s[0] == '/' || s[0] == '\\') {

					s++;

				} else if (s[0] == '.' && s[1] == '.') {

					s += 2;

				} else {

					break;

				}

			}

		}

	}

	*p = '\0';

}



static const struct {

	const char *extension;

	size_t ext_len;

	const char *mime_type;

} builtin_mime_types[] = {

	{".html", 5, "text/html"},

	{".htm", 4, "text/html"},

	{".shtm", 5, "text/html"},

	{".shtml", 6, "text/html"},

	{".css", 4, "text/css"},

	{".js",  3, "application/x-javascript"},

	{".ico", 4, "image/x-icon"},

	{".gif", 4, "image/gif"},

	{".jpg", 4, "image/jpeg"},

	{".jpeg", 5, "image/jpeg"},

	{".png", 4, "image/png"},

	{".svg", 4, "image/svg+xml"},

	{".txt", 4, "text/plain"},

	{".torrent", 8, "application/x-bittorrent"},

	{".wav", 4, "audio/x-wav"},

	{".mp3", 4, "audio/x-mp3"},

	{".mid", 4, "audio/mid"},

	{".m3u", 4, "audio/x-mpegurl"},

	{".ogg", 4, "audio/ogg"},

	{".ram", 4, "audio/x-pn-realaudio"},

	{".xml", 4, "text/xml"},

	{".json",  5, "text/json"},

	{".xslt", 5, "application/xml"},

	{".xsl", 4, "application/xml"},

	{".ra",  3, "audio/x-pn-realaudio"},

	{".doc", 4, "application/msword"},

	{".exe", 4, "application/octet-stream"},

	{".zip", 4, "application/x-zip-compressed"},

	{".xls", 4, "application/excel"},

	{".tgz", 4, "application/x-tar-gz"},

	{".tar", 4, "application/x-tar"},

	{".gz",  3, "application/x-gunzip"},

	{".arj", 4, "application/x-arj-compressed"},

	{".rar", 4, "application/x-arj-compressed"},

	{".rtf", 4, "application/rtf"},

	{".pdf", 4, "application/pdf"},

	{".swf", 4, "application/x-shockwave-flash"},

	{".mpg", 4, "video/mpeg"},

	{".webm", 5, "video/webm"},

	{".mpeg", 5, "video/mpeg"},

	{".mp4", 4, "video/mp4"},

	{".m4v", 4, "video/x-m4v"},

	{".asf", 4, "video/x-ms-asf"},

	{".avi", 4, "video/x-msvideo"},

	{".bmp", 4, "image/bmp"},

	{NULL,  0, NULL}

};



const char *mg_get_builtin_mime_type(const char *path) {

	const char *ext;

	size_t i, path_len;



	path_len = strlen(path);



	for (i = 0; builtin_mime_types[i].extension != NULL; i++) {

		ext = path + (path_len - builtin_mime_types[i].ext_len);

		if (path_len > builtin_mime_types[i].ext_len &&

				mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {

			return builtin_mime_types[i].mime_type;

		}

	}



	return "text/plain";

}



// Look at the "path" extension and figure what mime type it has.

// Store mime type in the vector.

static void get_mime_type(struct mg_context *ctx, const char *path,

		struct vec *vec) {

	struct vec ext_vec, mime_vec;

	const char *list, *ext;

	size_t path_len;



	path_len = strlen(path);



	// Scan user-defined mime types first, in case user wants to

	// override default mime types.

	list = ctx->config[EXTRA_MIME_TYPES];

	while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {

		// ext now points to the path suffix

		ext = path + path_len - ext_vec.len;

		if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {

			*vec = mime_vec;

			return;

		}

	}



	vec->ptr = mg_get_builtin_mime_type(path);

	vec->len = strlen(vec->ptr);

}



static int is_big_endian(void) {

	static const int n = 1;

	return ((char *) &n)[0] == 0;

}



#ifndef HAVE_MD5

typedef struct MD5Context {

	uint32_t buf[4];

	uint32_t bits[2];

	unsigned char in[64];

} MD5_CTX;



static void byteReverse(unsigned char *buf, unsigned longs) {

	uint32_t t;



	// Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN

	if (is_big_endian()) {

		do {

			t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |

				((unsigned) buf[1] << 8 | buf[0]);

			* (uint32_t *) buf = t;

			buf += 4;

		} while (--longs);

	}

}



#define F1(x, y, z) (z ^ (x & (y ^ z)))

#define F2(x, y, z) F1(z, x, y)

#define F3(x, y, z) (x ^ y ^ z)

#define F4(x, y, z) (y ^ (x | ~z))



#define MD5STEP(f, w, x, y, z, data, s) \

	( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )



// Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious

// initialization constants.

static void MD5Init(MD5_CTX *ctx) {

	ctx->buf[0] = 0x67452301;

	ctx->buf[1] = 0xefcdab89;

	ctx->buf[2] = 0x98badcfe;

	ctx->buf[3] = 0x10325476;



	ctx->bits[0] = 0;

	ctx->bits[1] = 0;

}



static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {

	register uint32_t a, b, c, d;



	a = buf[0];

	b = buf[1];

	c = buf[2];

	d = buf[3];



	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);

	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);

	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);

	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);

	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);

	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);

	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);

	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);

	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);

	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);

	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);

	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);

	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);

	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);

	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);

	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);



	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);

	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);

	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);

	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);

	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);

	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);

	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);

	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);

	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);

	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);

	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);

	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);

	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);

	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);

	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);

	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);



	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);

	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);

	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);

	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);

	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);

	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);

	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);

	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);

	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);

	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);

	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);

	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);

	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);

	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);

	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);

	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);



	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);

	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);

	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);

	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);

	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);

	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);

	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);

	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);

	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);

	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);

	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);

	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);

	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);

	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);

	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);

	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);



	buf[0] += a;

	buf[1] += b;

	buf[2] += c;

	buf[3] += d;

}



static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {

	uint32_t t;



	t = ctx->bits[0];

	if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)

		ctx->bits[1]++;

	ctx->bits[1] += len >> 29;



	t = (t >> 3) & 0x3f;



	if (t) {

		unsigned char *p = (unsigned char *) ctx->in + t;



		t = 64 - t;

		if (len < t) {

			memcpy(p, buf, len);

			return;

		}

		memcpy(p, buf, t);

		byteReverse(ctx->in, 16);

		MD5Transform(ctx->buf, (uint32_t *) ctx->in);

		buf += t;

		len -= t;

	}



	while (len >= 64) {

		memcpy(ctx->in, buf, 64);

		byteReverse(ctx->in, 16);

		MD5Transform(ctx->buf, (uint32_t *) ctx->in);

		buf += 64;

		len -= 64;

	}



	memcpy(ctx->in, buf, len);

}



static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {

	unsigned count;

	unsigned char *p;



	count = (ctx->bits[0] >> 3) & 0x3F;



	p = ctx->in + count;

	*p++ = 0x80;

	count = 64 - 1 - count;

	if (count < 8) {

		memset(p, 0, count);

		byteReverse(ctx->in, 16);

		MD5Transform(ctx->buf, (uint32_t *) ctx->in);

		memset(ctx->in, 0, 56);

	} else {

		memset(p, 0, count - 8);

	}

	byteReverse(ctx->in, 14);



	((uint32_t *) ctx->in)[14] = ctx->bits[0];

	((uint32_t *) ctx->in)[15] = ctx->bits[1];



	MD5Transform(ctx->buf, (uint32_t *) ctx->in);

	byteReverse((unsigned char *) ctx->buf, 4);

	memcpy(digest, ctx->buf, 16);

	memset((char *) ctx, 0, sizeof(*ctx));

}

#endif // !HAVE_MD5



// Stringify binary data. Output buffer must be twice as big as input,

// because each byte takes 2 bytes in string representation

static void bin2str(char *to, const unsigned char *p, size_t len) {

	static const char *hex = "0123456789abcdef";



	for (; len--; p++) {

		*to++ = hex[p[0] >> 4];

		*to++ = hex[p[0] & 0x0f];

	}

	*to = '\0';

}



// Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.

void mg_md5(char buf[33], ...) {

	unsigned char hash[16];

	const char *p;

	va_list ap;

	MD5_CTX ctx;



	MD5Init(&ctx);



	va_start(ap, buf);

	while ((p = va_arg(ap, const char *)) != NULL) {

		MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));

	}

	va_end(ap);



	MD5Final(hash, &ctx);

	bin2str(buf, hash, sizeof(hash));

}



// Check the user's password, return 1 if OK

static int check_password(const char *method, const char *ha1, const char *uri,

		const char *nonce, const char *nc, const char *cnonce,

		const char *qop, const char *response) {

	char ha2[32 + 1], expected_response[32 + 1];



	// Some of the parameters may be NULL

	if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||

			qop == NULL || response == NULL) {

		return 0;

	}



	// NOTE(lsm): due to a bug in MSIE, we do not compare the URI

	// TODO(lsm): check for authentication timeout

	if (// strcmp(dig->uri, c->ouri) != 0 ||

			strlen(response) != 32

			// || now - strtoul(dig->nonce, NULL, 10) > 3600

	   ) {

		return 0;

	}



	mg_md5(ha2, method, ":", uri, NULL);

	mg_md5(expected_response, ha1, ":", nonce, ":", nc,

			":", cnonce, ":", qop, ":", ha2, NULL);



	return mg_strcasecmp(response, expected_response) == 0;

}



// Use the global passwords file, if specified by auth_gpass option,

// or search for .htpasswd in the requested directory.

static void open_auth_file(struct mg_connection *conn, const char *path,

		struct file *filep) {

	char name[PATH_MAX];

	const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];



	if (gpass != NULL) {

		// Use global passwords file

		if (!mg_fopen(conn, gpass, "r", filep)) {

			cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));

		}

	} else if (mg_stat(conn, path, filep) && filep->is_directory) {

		mg_snprintf(conn, name, sizeof(name), "%s%c%s",

				path, '/', PASSWORDS_FILE_NAME);

		mg_fopen(conn, name, "r", filep);

	} else {

		// Try to find .htpasswd in requested directory.

		for (p = path, e = p + strlen(p) - 1; e > p; e--)

			if (e[0] == '/')

				break;

		mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",

				(int) (e - p), p, '/', PASSWORDS_FILE_NAME);

		mg_fopen(conn, name, "r", filep);

	}

}



// Parsed Authorization header

struct ah {

	char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;

};



// Return 1 on success. Always initializes the ah structure.

static int parse_auth_header(struct mg_connection *conn, char *buf,

		size_t buf_size, struct ah *ah) {

	char *name, *value, *s;

	const char *auth_header;



	(void) memset(ah, 0, sizeof(*ah));

	if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||

			mg_strncasecmp(auth_header, "Digest ", 7) != 0) {

		return 0;

	}



	// Make modifiable copy of the auth header

	(void) mg_strlcpy(buf, auth_header + 7, buf_size);

	s = buf;



	// Parse authorization header

	for (;;) {

		// Gobble initial spaces

		while (isspace(* (unsigned char *) s)) {

			s++;

		}

		name = skip_quoted(&s, "=", " ", 0);

		// Value is either quote-delimited, or ends at first comma or space.

		if (s[0] == '\"') {

			s++;

			value = skip_quoted(&s, "\"", " ", '\\');

			if (s[0] == ',') {

				s++;

			}

		} else {

			value = skip_quoted(&s, ", ", " ", 0);  // IE uses commas, FF uses spaces

		}

		if (*name == '\0') {

			break;

		}



		if (!strcmp(name, "username")) {

			ah->user = value;

		} else if (!strcmp(name, "cnonce")) {

			ah->cnonce = value;

		} else if (!strcmp(name, "response")) {

			ah->response = value;

		} else if (!strcmp(name, "uri")) {

			ah->uri = value;

		} else if (!strcmp(name, "qop")) {

			ah->qop = value;

		} else if (!strcmp(name, "nc")) {

			ah->nc = value;

		} else if (!strcmp(name, "nonce")) {

			ah->nonce = value;

		}

	}



	// CGI needs it as REMOTE_USER

	if (ah->user != NULL) {

		conn->request_info.remote_user = mg_strdup(ah->user);

	} else {

		return 0;

	}



	return 1;

}



static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {

	char *eof;

	size_t len;



	if (filep->membuf != NULL && *p != NULL) {

		eof = memchr(*p, '\n', &filep->membuf[filep->size] - *p);

		len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);

		memcpy(buf, *p, len);

		buf[len] = '\0';

		*p = eof;

		return eof;

	} else if (filep->fp != NULL) {

		return fgets(buf, size, filep->fp);

	} else {

		return NULL;

	}

}



// Authorize against the opened passwords file. Return 1 if authorized.

static int authorize(struct mg_connection *conn, struct file *filep) {

	struct ah ah;

	char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;



	if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {

		return 0;

	}



	// Loop over passwords file

	p = (char *) filep->membuf;

	while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {

		if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {

			continue;

		}



		if (!strcmp(ah.user, f_user) &&

				!strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))

			return check_password(conn->request_info.request_method, ha1, ah.uri,

					ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);

	}



	return 0;

}



// Return 1 if request is authorised, 0 otherwise.

static int check_authorization(struct mg_connection *conn, const char *path) {

	char fname[PATH_MAX];

	struct vec uri_vec, filename_vec;

	const char *list;

	struct file file = STRUCT_FILE_INITIALIZER;

	int authorized = 1;



	list = conn->ctx->config[PROTECT_URI];

	while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {

		if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {

			mg_snprintf(conn, fname, sizeof(fname), "%.*s",

					(int) filename_vec.len, filename_vec.ptr);

			if (!mg_fopen(conn, fname, "r", &file)) {

				cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));

			}

			break;

		}

	}



	if (!is_file_opened(&file)) {

		open_auth_file(conn, path, &file);

	}



	if (is_file_opened(&file)) {

		authorized = authorize(conn, &file);

		mg_fclose(&file);

	}



	return authorized;

}



static void send_authorization_request(struct mg_connection *conn) {

	conn->status_code = 401;

	mg_printf(conn,

			"HTTP/1.1 401 Unauthorized\r\n"

			"Content-Length: 0\r\n"

			"WWW-Authenticate: Digest qop=\"auth\", "

			"realm=\"%s\", nonce=\"%lu\"\r\n\r\n",

			conn->ctx->config[AUTHENTICATION_DOMAIN],

			(unsigned long) time(NULL));

}



static int is_authorized_for_put(struct mg_connection *conn) {

	struct file file = STRUCT_FILE_INITIALIZER;

	const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];

	int ret = 0;



	if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {

		ret = authorize(conn, &file);

		mg_fclose(&file);

	}



	return ret;

}



int mg_modify_passwords_file(const char *fname, const char *domain,

		const char *user, const char *pass) {

	int found;

	char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];

	FILE *fp, *fp2;



	found = 0;

	fp = fp2 = NULL;



	// Regard empty password as no password - remove user record.

	if (pass != NULL && pass[0] == '\0') {

		pass = NULL;

	}



	(void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);



	// Create the file if does not exist

	if ((fp = fopen(fname, "a+")) != NULL) {

		(void) fclose(fp);

	}



	// Open the given file and temporary file

	if ((fp = fopen(fname, "r")) == NULL) {

		return 0;

	} else if ((fp2 = fopen(tmp, "w+")) == NULL) {

		fclose(fp);

		return 0;

	}



	// Copy the stuff to temporary file

	while (fgets(line, sizeof(line), fp) != NULL) {

		if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {

			continue;

		}



		if (!strcmp(u, user) && !strcmp(d, domain)) {

			found++;

			if (pass != NULL) {

				mg_md5(ha1, user, ":", domain, ":", pass, NULL);

				fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);

			}

		} else {

			fprintf(fp2, "%s", line);

		}

	}



	// If new user, just add it

	if (!found && pass != NULL) {

		mg_md5(ha1, user, ":", domain, ":", pass, NULL);

		fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);

	}



	// Close files

	fclose(fp);

	fclose(fp2);



	// Put the temp file in place of real file

	remove(fname);

	rename(tmp, fname);



	return 1;

}



struct de {

	struct mg_connection *conn;

	char *file_name;

	struct file file;

};



static void url_encode(const char *src, char *dst, size_t dst_len) {

	static const char *dont_escape = "._-$,;~()";

	static const char *hex = "0123456789abcdef";

	const char *end = dst + dst_len - 1;



	for (; *src != '\0' && dst < end; src++, dst++) {

		if (isalnum(*(const unsigned char *) src) ||

				strchr(dont_escape, * (const unsigned char *) src) != NULL) {

			*dst = *src;

		} else if (dst + 2 < end) {

			dst[0] = '%';

			dst[1] = hex[(* (const unsigned char *) src) >> 4];

			dst[2] = hex[(* (const unsigned char *) src) & 0xf];

			dst += 2;

		}

	}



	*dst = '\0';

}



static void print_dir_entry(struct de *de) {

	char size[64], mod[64], href[PATH_MAX];



	if (de->file.is_directory) {

		mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");

	} else {

		// We use (signed) cast below because MSVC 6 compiler cannot

		// convert unsigned __int64 to double. Sigh.

		if (de->file.size < 1024) {

			mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);

		} else if (de->file.size < 0x100000) {

			mg_snprintf(de->conn, size, sizeof(size),

					"%.1fk", (double) de->file.size / 1024.0);

		} else if (de->file.size < 0x40000000) {

			mg_snprintf(de->conn, size, sizeof(size),

					"%.1fM", (double) de->file.size / 1048576);

		} else {

			mg_snprintf(de->conn, size, sizeof(size),

					"%.1fG", (double) de->file.size / 1073741824);

		}

	}

	strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",

			localtime(&de->file.modification_time));

	url_encode(de->file_name, href, sizeof(href));

	de->conn->num_bytes_sent += mg_printf(de->conn,

			"<tr><td><a href=\"%s%s%s\">%s%s</a></td>"

			"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",

			de->conn->request_info.uri, href, de->file.is_directory ? "/" : "",

			de->file_name, de->file.is_directory ? "/" : "", mod, size);

}



// This function is called from send_directory() and used for

// sorting directory entries by size, or name, or modification time.

// On windows, __cdecl specification is needed in case if project is built

// with __stdcall convention. qsort always requires __cdels callback.

static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {

	const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;

	const char *query_string = a->conn->request_info.query_string;

	int cmp_result = 0;



	if (query_string == NULL) {

		query_string = "na";

	}



	if (a->file.is_directory && !b->file.is_directory) {

		return -1;  // Always put directories on top

	} else if (!a->file.is_directory && b->file.is_directory) {

		return 1;   // Always put directories on top

	} else if (*query_string == 'n') {

		cmp_result = strcmp(a->file_name, b->file_name);

	} else if (*query_string == 's') {

		cmp_result = a->file.size == b->file.size ? 0 :

			a->file.size > b->file.size ? 1 : -1;

	} else if (*query_string == 'd') {

		cmp_result = a->file.modification_time == b->file.modification_time ? 0 :

			a->file.modification_time > b->file.modification_time ? 1 : -1;

	}



	return query_string[1] == 'd' ? -cmp_result : cmp_result;

}



static int must_hide_file(struct mg_connection *conn, const char *path) {

	const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";

	const char *pattern = conn->ctx->config[HIDE_FILES];

	return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||

		(pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);

}



static int scan_directory(struct mg_connection *conn, const char *dir,

		void *data, void (*cb)(struct de *, void *)) {

	char path[PATH_MAX];

	struct dirent *dp;

	DIR *dirp;

	struct de de;



	if ((dirp = opendir(dir)) == NULL) {

		return 0;

	} else {

		de.conn = conn;



		while ((dp = readdir(dirp)) != NULL) {

			// Do not show current dir and hidden files

			if (!strcmp(dp->d_name, ".") ||

					!strcmp(dp->d_name, "..") ||

					must_hide_file(conn, dp->d_name)) {

				continue;

			}



			mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);



			// If we don't memset stat structure to zero, mtime will have

			// garbage and strftime() will segfault later on in

			// print_dir_entry(). memset is required only if mg_stat()

			// fails. For more details, see

			// http://code.google.com/p/mongoose/issues/detail?id=79

			memset(&de.file, 0, sizeof(de.file));

			mg_stat(conn, path, &de.file);



			de.file_name = dp->d_name;

			cb(&de, data);

		}

		(void) closedir(dirp);

	}

	return 1;

}



struct dir_scan_data {

	struct de *entries;

	int num_entries;

	int arr_size;

};



static void dir_scan_callback(struct de *de, void *data) {

	struct dir_scan_data *dsd = (struct dir_scan_data *) data;



	if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {

		dsd->arr_size *= 2;

		dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *

				sizeof(dsd->entries[0]));

	}

	if (dsd->entries == NULL) {

		// TODO(lsm): propagate an error to the caller

		dsd->num_entries = 0;

	} else {

		dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);

		dsd->entries[dsd->num_entries].file = de->file;

		dsd->entries[dsd->num_entries].conn = de->conn;

		dsd->num_entries++;

	}

}



static void handle_directory_request(struct mg_connection *conn,

		const char *dir) {

	int i, sort_direction;

	struct dir_scan_data data = { NULL, 0, 128 };



	if (!scan_directory(conn, dir, &data, dir_scan_callback)) {

		send_http_error(conn, 500, "Cannot open directory",

				"Error: opendir(%s): %s", dir, strerror(ERRNO));

		return;

	}



	sort_direction = conn->request_info.query_string != NULL &&

		conn->request_info.query_string[1] == 'd' ? 'a' : 'd';



	conn->must_close = 1;

	mg_printf(conn, "%s",

			"HTTP/1.1 200 OK\r\n"

			"Connection: close\r\n"

			"Content-Type: text/html; charset=utf-8\r\n\r\n");



	conn->num_bytes_sent += mg_printf(conn,

			"<html><head><title>Index of %s</title>"

			"<style>th {text-align: left;}</style></head>"

			"<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"

			"<tr><th><a href=\"?n%c\">Name</a></th>"

			"<th><a href=\"?d%c\">Modified</a></th>"

			"<th><a href=\"?s%c\">Size</a></th></tr>"

			"<tr><td colspan=\"3\"><hr></td></tr>",

			conn->request_info.uri, conn->request_info.uri,

			sort_direction, sort_direction, sort_direction);



	// Print first entry - link to a parent directory

	conn->num_bytes_sent += mg_printf(conn,

			"<tr><td><a href=\"%s%s\">%s</a></td>"

			"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",

			conn->request_info.uri, "..", "Parent directory", "-", "-");



	// Sort and print directory entries

	qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),

			compare_dir_entries);

	for (i = 0; i < data.num_entries; i++) {

		print_dir_entry(&data.entries[i]);

		free(data.entries[i].file_name);

	}

	free(data.entries);



	conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");

	conn->status_code = 200;

}



// Send len bytes from the opened file to the client.

static void send_file_data(struct mg_connection *conn, struct file *filep,

		int64_t offset, int64_t len) {

	char buf[MG_BUF_LEN];

	int to_read, num_read, num_written;



	if (len > 0 && filep->membuf != NULL && filep->size > 0) {

		if (len > filep->size - offset) {

			len = filep->size - offset;

		}

		mg_write(conn, filep->membuf + offset, (size_t) len);

	} else if (len > 0 && filep->fp != NULL) {

		fseeko(filep->fp, offset, SEEK_SET);

		while (len > 0) {

			// Calculate how much to read from the file in the buffer

			to_read = sizeof(buf);

			if ((int64_t) to_read > len) {

				to_read = (int) len;

			}



			// Read from file, exit the loop on error

			if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {

				break;

			}



			// Send read bytes to the client, exit the loop on error

			if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {

				break;

			}



			// Both read and were successful, adjust counters

			conn->num_bytes_sent += num_written;

			len -= num_written;

		}

	}

}



static int parse_range_header(const char *header, int64_t *a, int64_t *b) {

	return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);

}



static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {

	strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));

}



static void construct_etag(char *buf, size_t buf_len,

		const struct file *filep) {

	snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",

			(unsigned long) filep->modification_time, filep->size);

}



static void fclose_on_exec(struct file *filep) {

	if (filep != NULL && filep->fp != NULL) {

#ifndef _WIN32

		fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);

#endif

	}

}



static void handle_file_request(struct mg_connection *conn, const char *path,

		struct file *filep) {

	char date[64], lm[64], etag[64], range[64];

	const char *msg = "OK", *hdr;

	time_t curtime = time(NULL);

	int64_t cl, r1, r2;

	struct vec mime_vec;

	int n;



	get_mime_type(conn->ctx, path, &mime_vec);

	cl = filep->size;

	conn->status_code = 200;

	range[0] = '\0';



	if (!mg_fopen(conn, path, "rb", filep)) {

		send_http_error(conn, 500, http_500_error,

				"fopen(%s): %s", path, strerror(ERRNO));

		return;

	}

	fclose_on_exec(filep);



	// If Range: header specified, act accordingly

	r1 = r2 = 0;

	hdr = mg_get_header(conn, "Range");

	if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&

			r1 >= 0 && r2 > 0) {

		conn->status_code = 206;

		cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;

		mg_snprintf(conn, range, sizeof(range),

				"Content-Range: bytes "

				"%" INT64_FMT "-%"

				INT64_FMT "/%" INT64_FMT "\r\n",

				r1, r1 + cl - 1, filep->size);

		msg = "Partial Content";

	}



	// Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to

	// http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3

	gmt_time_string(date, sizeof(date), &curtime);

	gmt_time_string(lm, sizeof(lm), &filep->modification_time);

	construct_etag(etag, sizeof(etag), filep);



	(void) mg_printf(conn,

			"HTTP/1.1 %d %s\r\n"

			"Date: %s\r\n"

			"Last-Modified: %s\r\n"

			"Etag: %s\r\n"

			"Content-Type: %.*s\r\n"

			"Content-Length: %" INT64_FMT "\r\n"

			"Connection: %s\r\n"

			"Accept-Ranges: bytes\r\n"

			"%s\r\n",

			conn->status_code, msg, date, lm, etag, (int) mime_vec.len,

			mime_vec.ptr, cl, suggest_connection_header(conn), range);



	if (strcmp(conn->request_info.request_method, "HEAD") != 0) {

		send_file_data(conn, filep, r1, cl);

	}

	mg_fclose(filep);

}



void mg_send_file(struct mg_connection *conn, const char *path) {

	struct file file = STRUCT_FILE_INITIALIZER;

	if (mg_stat(conn, path, &file)) {

		handle_file_request(conn, path, &file);

	} else {

		send_http_error(conn, 404, "Not Found", "%s", "File not found");

	}

}





// Parse HTTP headers from the given buffer, advance buffer to the point

// where parsing stopped.

static void parse_http_headers(char **buf, struct mg_request_info *ri) {

	int i;



	for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {

		ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);

		ri->http_headers[i].value = skip(buf, "\r\n");

		if (ri->http_headers[i].name[0] == '\0')

			break;

		ri->num_headers = i + 1;

	}

}



static int is_valid_http_method(const char *method) {

	return !strcmp(method, "GET") || !strcmp(method, "POST") ||

		!strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||

		!strcmp(method, "PUT") || !strcmp(method, "DELETE") ||

		!strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");

}



// Parse HTTP request, fill in mg_request_info structure.

// This function modifies the buffer by NUL-terminating

// HTTP request components, header names and header values.

static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {

	int is_request, request_length = get_request_len(buf, len);

	if (request_length > 0) {

		// Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port

		ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;

		ri->num_headers = 0;



		buf[request_length - 1] = '\0';



		// RFC says that all initial whitespaces should be ingored

		while (*buf != '\0' && isspace(* (unsigned char *) buf)) {

			buf++;

		}

		ri->request_method = skip(&buf, " ");

		ri->uri = skip(&buf, " ");

		ri->http_version = skip(&buf, "\r\n");

		if (((is_request = is_valid_http_method(ri->request_method)) &&

					memcmp(ri->http_version, "HTTP/", 5) != 0) ||

				(!is_request && memcmp(ri->request_method, "HTTP/", 5)) != 0) {

			request_length = -1;

		} else {

			if (is_request) {

				ri->http_version += 5;

			}

			parse_http_headers(&buf, ri);

		}

	}

	return request_length;

}



// Keep reading the input (either opened file descriptor fd, or socket sock,

// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the

// buffer (which marks the end of HTTP request). Buffer buf may already

// have some data. The length of the data is stored in nread.

// Upon every read operation, increase nread by the number of bytes read.

static int read_request(FILE *fp, struct mg_connection *conn,

		char *buf, int bufsiz, int *nread) {

	int request_len, n = 0;

	FILE *f9;

	f9 = fopen("read_req.txt","a");

	fprintf(f9,"  Am in read req");

	request_len = get_request_len(buf, *nread);

	while (*nread < bufsiz && request_len == 0 &&

			(n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {

		*nread += n;

		assert(*nread <= bufsiz);

		request_len = get_request_len(buf, *nread);

	}

	fprintf(f9,"\n buf: %s",buf);

	fprintf(f9, "data_len: %s length:%d req_length: %d data_len: %d buf_size: %d",conn->buf, conn->content_len, conn-> request_len, conn-> data_len, conn-> buf_size);

	fclose(f9);

	return request_len <= 0 && n <= 0 ? -1 : request_len;

}



// For given directory path, substitute it to valid index file.

// Return 0 if index file has been found, -1 if not found.

// If the file is found, it's stats is returned in stp.

static int substitute_index_file(struct mg_connection *conn, char *path,

		size_t path_len, struct file *filep) {

	const char *list = conn->ctx->config[INDEX_FILES];

	struct file file = STRUCT_FILE_INITIALIZER;

	struct vec filename_vec;

	size_t n = strlen(path);

	int found = 0;



	// The 'path' given to us points to the directory. Remove all trailing

	// directory separator characters from the end of the path, and

	// then append single directory separator character.

	while (n > 0 && path[n - 1] == '/') {

		n--;

	}

	path[n] = '/';



	// Traverse index files list. For each entry, append it to the given

	// path and see if the file exists. If it exists, break the loop

	while ((list = next_option(list, &filename_vec, NULL)) != NULL) {



		// Ignore too long entries that may overflow path buffer

		if (filename_vec.len > path_len - (n + 2))

			continue;



		// Prepare full path to the index file

		mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);



		// Does it exist?

		if (mg_stat(conn, path, &file)) {

			// Yes it does, break the loop

			*filep = file;

			found = 1;

			break;

		}

	}



	// If no index file exists, restore directory path

	if (!found) {

		path[n] = '\0';

	}



	return found;

}



// Return True if we should reply 304 Not Modified.

static int is_not_modified(const struct mg_connection *conn,

		const struct file *filep) {

	char etag[64];

	const char *ims = mg_get_header(conn, "If-Modified-Since");

	const char *inm = mg_get_header(conn, "If-None-Match");

	construct_etag(etag, sizeof(etag), filep);

	return (inm != NULL && !mg_strcasecmp(etag, inm)) ||

		(ims != NULL && filep->modification_time <= parse_date_string(ims));

}



static int forward_body_data(struct mg_connection *conn, FILE *fp,

		SOCKET sock, SSL *ssl) {

	const char *expect, *body;

	char buf[MG_BUF_LEN];

	int to_read, nread, buffered_len, success = 0;



	expect = mg_get_header(conn, "Expect");

	assert(fp != NULL);



	if (conn->content_len == -1) {

		send_http_error(conn, 411, "Length Required", "%s", "");

	} else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {

		send_http_error(conn, 417, "Expectation Failed", "%s", "");

	} else {

		if (expect != NULL) {

			(void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");

		}



		body = conn->buf + conn->request_len + conn->consumed_content;

		buffered_len = &conn->buf[conn->data_len] - body;

		assert(buffered_len >= 0);

		assert(conn->consumed_content == 0);



		if (buffered_len > 0) {

			if ((int64_t) buffered_len > conn->content_len) {

				buffered_len = (int) conn->content_len;

			}

			push(fp, sock, ssl, body, (int64_t) buffered_len);

			conn->consumed_content += buffered_len;

		}



		nread = 0;

		while (conn->consumed_content < conn->content_len) {

			to_read = sizeof(buf);

			if ((int64_t) to_read > conn->content_len - conn->consumed_content) {

				to_read = (int) (conn->content_len - conn->consumed_content);

			}

			nread = pull(NULL, conn, buf, to_read);

			if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {

				break;

			}

			conn->consumed_content += nread;

		}



		if (conn->consumed_content == conn->content_len) {

			success = nread >= 0;

		}



		// Each error code path in this function must send an error

		if (!success) {

			send_http_error(conn, 577, http_500_error, "%s", "");

		}

	}



	return success;

}



#if !defined(NO_CGI)

// This structure helps to create an environment for the spawned CGI program.

// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,

// last element must be NULL.

// However, on Windows there is a requirement that all these VARIABLE=VALUE\0

// strings must reside in a contiguous buffer. The end of the buffer is

// marked by two '\0' characters.

// We satisfy both worlds: we create an envp array (which is vars), all

// entries are actually pointers inside buf.

struct cgi_env_block {

	struct mg_connection *conn;

	char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer

	int len; // Space taken

	char *vars[MAX_CGI_ENVIR_VARS]; // char **envp

	int nvars; // Number of variables

};



static char *addenv(struct cgi_env_block *block,

		PRINTF_FORMAT_STRING(const char *fmt), ...)

	PRINTF_ARGS(2, 3);



	// Append VARIABLE=VALUE\0 string to the buffer, and add a respective

	// pointer into the vars array.

	static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {

		int n, space;

		char *added;

		va_list ap;



		// Calculate how much space is left in the buffer

		space = sizeof(block->buf) - block->len - 2;

		assert(space >= 0);



		// Make a pointer to the free space int the buffer

		added = block->buf + block->len;



		// Copy VARIABLE=VALUE\0 string into the free space

		va_start(ap, fmt);

		n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);

		va_end(ap);



		// Make sure we do not overflow buffer and the envp array

		if (n > 0 && n + 1 < space &&

				block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {

			// Append a pointer to the added string into the envp array

			block->vars[block->nvars++] = added;

			// Bump up used length counter. Include \0 terminator

			block->len += n + 1;

		} else {

			cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);

		}



		return added;

	}



static void prepare_cgi_environment(struct mg_connection *conn,

		const char *prog,

		struct cgi_env_block *blk) {

	const char *s, *slash;

	struct vec var_vec;

	char *p, src_addr[20];

	int  i;



	blk->len = blk->nvars = 0;

	blk->conn = conn;

	sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);



	addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);

	addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);

	addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);



	// Prepare the environment block

	addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");

	addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");

	addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP



	// TODO(lsm): fix this for IPv6 case

	addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));



	addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);

	addenv(blk, "REMOTE_ADDR=%s", src_addr);

	addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);

	addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);



	// SCRIPT_NAME

	assert(conn->request_info.uri[0] == '/');

	slash = strrchr(conn->request_info.uri, '/');

	if ((s = strrchr(prog, '/')) == NULL)

		s = prog;

	addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),

			conn->request_info.uri, s);



	addenv(blk, "SCRIPT_FILENAME=%s", prog);

	addenv(blk, "PATH_TRANSLATED=%s", prog);

	addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");



	if ((s = mg_get_header(conn, "Content-Type")) != NULL)

		addenv(blk, "CONTENT_TYPE=%s", s);



	if (conn->request_info.query_string != NULL)

		addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);



	if ((s = mg_get_header(conn, "Content-Length")) != NULL)

		addenv(blk, "CONTENT_LENGTH=%s", s);



	if ((s = getenv("PATH")) != NULL)

		addenv(blk, "PATH=%s", s);



	if (conn->path_info != NULL) {

		addenv(blk, "PATH_INFO=%s", conn->path_info);

	}



#if defined(_WIN32)

	if ((s = getenv("COMSPEC")) != NULL) {

		addenv(blk, "COMSPEC=%s", s);

	}

	if ((s = getenv("SYSTEMROOT")) != NULL) {

		addenv(blk, "SYSTEMROOT=%s", s);

	}

	if ((s = getenv("SystemDrive")) != NULL) {

		addenv(blk, "SystemDrive=%s", s);

	}

#else

	if ((s = getenv("LD_LIBRARY_PATH")) != NULL)

		addenv(blk, "LD_LIBRARY_PATH=%s", s);

#endif // _WIN32



	if ((s = getenv("PERLLIB")) != NULL)

		addenv(blk, "PERLLIB=%s", s);



	if (conn->request_info.remote_user != NULL) {

		addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);

		addenv(blk, "%s", "AUTH_TYPE=Digest");

	}



	// Add all headers as HTTP_* variables

	for (i = 0; i < conn->request_info.num_headers; i++) {

		p = addenv(blk, "HTTP_%s=%s",

				conn->request_info.http_headers[i].name,

				conn->request_info.http_headers[i].value);



		// Convert variable name into uppercase, and change - to _

		for (; *p != '=' && *p != '\0'; p++) {

			if (*p == '-')

				*p = '_';

			*p = (char) toupper(* (unsigned char *) p);

		}

	}



	// Add user-specified variables

	s = conn->ctx->config[CGI_ENVIRONMENT];

	while ((s = next_option(s, &var_vec, NULL)) != NULL) {

		addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);

	}



	blk->vars[blk->nvars++] = NULL;

	blk->buf[blk->len++] = '\0';



	assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));

	assert(blk->len > 0);

	assert(blk->len < (int) sizeof(blk->buf));

}



static void handle_cgi_request(struct mg_connection *conn, const char *prog) {

	int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];

	const char *status, *status_text;

	char buf[16384], *pbuf, dir[PATH_MAX], *p;

	struct mg_request_info ri;

	struct cgi_env_block blk;

	FILE *in, *out;

	struct file fout = STRUCT_FILE_INITIALIZER;

	pid_t pid;



	prepare_cgi_environment(conn, prog, &blk);



	// CGI must be executed in its own directory. 'dir' must point to the

	// directory containing executable program, 'p' must point to the

	// executable program name relative to 'dir'.

	(void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);

	if ((p = strrchr(dir, '/')) != NULL) {

		*p++ = '\0';

	} else {

		dir[0] = '.', dir[1] = '\0';

		p = (char *) prog;

	}



	pid = (pid_t) -1;

	fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;

	in = out = NULL;



	if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {

		send_http_error(conn, 500, http_500_error,

				"Cannot create CGI pipe: %s", strerror(ERRNO));

		goto done;

	}



	pid = spawn_process(conn, p, blk.buf, blk.vars, fd_stdin[0], fd_stdout[1],

			dir);

	// spawn_process() must close those!

	// If we don't mark them as closed, close() attempt before

	// return from this function throws an exception on Windows.

	// Windows does not like when closed descriptor is closed again.

	fd_stdin[0] = fd_stdout[1] = -1;



	if (pid == (pid_t) -1) {

		send_http_error(conn, 500, http_500_error,

				"Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));

		goto done;

	}



	if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||

			(out = fdopen(fd_stdout[0], "rb")) == NULL) {

		send_http_error(conn, 500, http_500_error,

				"fopen: %s", strerror(ERRNO));

		goto done;

	}



	setbuf(in, NULL);

	setbuf(out, NULL);

	fout.fp = out;



	// Send POST data to the CGI process if needed

	if (!strcmp(conn->request_info.request_method, "POST") &&

			!forward_body_data(conn, in, INVALID_SOCKET, NULL)) {

		goto done;

	}



	// Close so child gets an EOF.

	fclose(in);

	in = NULL;

	fd_stdin[1] = -1;



	// Now read CGI reply into a buffer. We need to set correct

	// status code, thus we need to see all HTTP headers first.

	// Do not send anything back to client, until we buffer in all

	// HTTP headers.

	data_len = 0;

	headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);

	if (headers_len <= 0) {

		send_http_error(conn, 500, http_500_error,

				"CGI program sent malformed or too big (>%u bytes) "

				"HTTP headers: [%.*s]",

				(unsigned) sizeof(buf), data_len, buf);

		goto done;

	}

	pbuf = buf;

	buf[headers_len - 1] = '\0';

	parse_http_headers(&pbuf, &ri);



	// Make up and send the status line

	status_text = "OK";

	if ((status = get_header(&ri, "Status")) != NULL) {

		conn->status_code = atoi(status);

		status_text = status;

		while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {

			status_text++;

		}

	} else if (get_header(&ri, "Location") != NULL) {

		conn->status_code = 302;

	} else {

		conn->status_code = 200;

	}

	if (get_header(&ri, "Connection") != NULL &&

			!mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {

		conn->must_close = 1;

	}

	(void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,

			status_text);



	// Send headers

	for (i = 0; i < ri.num_headers; i++) {

		mg_printf(conn, "%s: %s\r\n",

				ri.http_headers[i].name, ri.http_headers[i].value);

	}

	mg_write(conn, "\r\n", 2);



	// Send chunk of data that may have been read after the headers

	conn->num_bytes_sent += mg_write(conn, buf + headers_len,

			(size_t)(data_len - headers_len));



	// Read the rest of CGI output and send to the client

	send_file_data(conn, &fout, 0, INT64_MAX);



done:

	if (pid != (pid_t) -1) {

		kill(pid, SIGKILL);

	}

	if (fd_stdin[0] != -1) {

		close(fd_stdin[0]);

	}

	if (fd_stdout[1] != -1) {

		close(fd_stdout[1]);

	}



	if (in != NULL) {

		fclose(in);

	} else if (fd_stdin[1] != -1) {

		close(fd_stdin[1]);

	}



	if (out != NULL) {

		fclose(out);

	} else if (fd_stdout[0] != -1) {

		close(fd_stdout[0]);

	}

}

#endif // !NO_CGI



// For a given PUT path, create all intermediate subdirectories

// for given path. Return 0 if the path itself is a directory,

// or -1 on error, 1 if OK.

static int put_dir(struct mg_connection *conn, const char *path) {

	char buf[PATH_MAX];

	const char *s, *p;

	struct file file = STRUCT_FILE_INITIALIZER;

	int len, res = 1;



	for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {

		len = p - path;

		if (len >= (int) sizeof(buf)) {

			res = -1;

			break;

		}

		memcpy(buf, path, len);

		buf[len] = '\0';



		// Try to create intermediate directory

		DEBUG_TRACE(("mkdir(%s)", buf));

		if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {

			res = -1;

			break;

		}



		// Is path itself a directory?

		if (p[1] == '\0') {

			res = 0;

		}

	}



	return res;

}



static void put_file(struct mg_connection *conn, const char *path) {

	struct file file = STRUCT_FILE_INITIALIZER;

	const char *range;

	int64_t r1, r2;

	int rc;



	conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;



	if ((rc = put_dir(conn, path)) == 0) {

		mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);

	} else if (rc == -1) {

		send_http_error(conn, 500, http_500_error,

				"put_dir(%s): %s", path, strerror(ERRNO));

	} else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {

		mg_fclose(&file);

		send_http_error(conn, 500, http_500_error,

				"fopen(%s): %s", path, strerror(ERRNO));

	} else {

		fclose_on_exec(&file);

		range = mg_get_header(conn, "Content-Range");

		r1 = r2 = 0;

		if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {

			conn->status_code = 206;

			fseeko(file.fp, r1, SEEK_SET);

		}

		if (forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {

			mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);

		}

		mg_fclose(&file);

	}

}



static void send_ssi_file(struct mg_connection *, const char *,

		struct file *, int);



static void do_ssi_include(struct mg_connection *conn, const char *ssi,

		char *tag, int include_level) {

	char file_name[MG_BUF_LEN], path[PATH_MAX], *p;

	struct file file = STRUCT_FILE_INITIALIZER;



	// sscanf() is safe here, since send_ssi_file() also uses buffer

	// of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.

	if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {

		// File name is relative to the webserver root

		(void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",

				conn->ctx->config[DOCUMENT_ROOT], '/', file_name);

	} else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {

		// File name is relative to the webserver working directory

		// or it is absolute system path

		(void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);

	} else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {

		// File name is relative to the currect document

		(void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);

		if ((p = strrchr(path, '/')) != NULL) {

			p[1] = '\0';

		}

		(void) mg_snprintf(conn, path + strlen(path),

				sizeof(path) - strlen(path), "%s", file_name);

	} else {

		cry(conn, "Bad SSI #include: [%s]", tag);

		return;

	}



	if (!mg_fopen(conn, path, "rb", &file)) {

		cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",

				tag, path, strerror(ERRNO));

	} else {

		fclose_on_exec(&file);

		if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],

					strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {

			send_ssi_file(conn, path, &file, include_level + 1);

		} else {

			send_file_data(conn, &file, 0, INT64_MAX);

		}

		mg_fclose(&file);

	}

}



#if !defined(NO_POPEN)

static void do_ssi_exec(struct mg_connection *conn, char *tag) {

	char cmd[MG_BUF_LEN];

	struct file file = STRUCT_FILE_INITIALIZER;



	if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {

		cry(conn, "Bad SSI #exec: [%s]", tag);

	} else if ((file.fp = popen(cmd, "r")) == NULL) {

		cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));

	} else {

		send_file_data(conn, &file, 0, INT64_MAX);

		pclose(file.fp);

	}

}

#endif // !NO_POPEN



static int mg_fgetc(struct file *filep, int offset) {

	if (filep->membuf != NULL && offset >=0 && offset < filep->size) {

		return ((unsigned char *) filep->membuf)[offset];

	} else if (filep->fp != NULL) {

		return fgetc(filep->fp);

	} else {

		return EOF;

	}

}



static void send_ssi_file(struct mg_connection *conn, const char *path,

		struct file *filep, int include_level) {

	char buf[MG_BUF_LEN];

	int ch, offset, len, in_ssi_tag;



	if (include_level > 10) {

		cry(conn, "SSI #include level is too deep (%s)", path);

		return;

	}



	in_ssi_tag = len = offset = 0;

	while ((ch = mg_fgetc(filep, offset)) != EOF) {

		if (in_ssi_tag && ch == '>') {

			in_ssi_tag = 0;

			buf[len++] = (char) ch;

			buf[len] = '\0';

			assert(len <= (int) sizeof(buf));

			if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {

				// Not an SSI tag, pass it

				(void) mg_write(conn, buf, (size_t) len);

			} else {

				if (!memcmp(buf + 5, "include", 7)) {

					do_ssi_include(conn, path, buf + 12, include_level);

#if !defined(NO_POPEN)

				} else if (!memcmp(buf + 5, "exec", 4)) {

					do_ssi_exec(conn, buf + 9);

#endif // !NO_POPEN

				} else {

					cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);

				}

			}

			len = 0;

		} else if (in_ssi_tag) {

			if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {

				// Not an SSI tag

				in_ssi_tag = 0;

			} else if (len == (int) sizeof(buf) - 2) {

				cry(conn, "%s: SSI tag is too large", path);

				len = 0;

			}

			buf[len++] = ch & 0xff;

		} else if (ch == '<') {

			in_ssi_tag = 1;

			if (len > 0) {

				mg_write(conn, buf, (size_t) len);

			}

			len = 0;

			buf[len++] = ch & 0xff;

		} else {

			buf[len++] = ch & 0xff;

			if (len == (int) sizeof(buf)) {

				mg_write(conn, buf, (size_t) len);

				len = 0;

			}

		}

	}



	// Send the rest of buffered data

	if (len > 0) {

		mg_write(conn, buf, (size_t) len);

	}

}



static void handle_ssi_file_request(struct mg_connection *conn,

		const char *path) {

	struct file file = STRUCT_FILE_INITIALIZER;



	if (!mg_fopen(conn, path, "rb", &file)) {

		send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,

				strerror(ERRNO));

	} else {

		conn->must_close = 1;

		fclose_on_exec(&file);

		mg_printf(conn, "HTTP/1.1 200 OK\r\n"

				"Content-Type: text/html\r\nConnection: %s\r\n\r\n",

				suggest_connection_header(conn));

		send_ssi_file(conn, path, &file, 0);

		mg_fclose(&file);

	}

}



static void send_options(struct mg_connection *conn) {

	conn->status_code = 200;



	mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"

			"Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n"

			"DAV: 1\r\n\r\n");

}



// Writes PROPFIND properties for a collection element

static void print_props(struct mg_connection *conn, const char* uri,

		struct file *filep) {

	char mtime[64];

	gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);

	conn->num_bytes_sent += mg_printf(conn,

			"<d:response>"

			"<d:href>%s</d:href>"

			"<d:propstat>"

			"<d:prop>"

			"<d:resourcetype>%s</d:resourcetype>"

			"<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"

			"<d:getlastmodified>%s</d:getlastmodified>"

			"</d:prop>"

			"<d:status>HTTP/1.1 200 OK</d:status>"

			"</d:propstat>"

			"</d:response>\n",

			uri,

			filep->is_directory ? "<d:collection/>" : "",

			filep->size,

			mtime);

}



static void print_dav_dir_entry(struct de *de, void *data) {

	char href[PATH_MAX];

	struct mg_connection *conn = (struct mg_connection *) data;

	mg_snprintf(conn, href, sizeof(href), "%s%s",

			conn->request_info.uri, de->file_name);

	print_props(conn, href, &de->file);

}



static void handle_propfind(struct mg_connection *conn, const char *path,

		struct file *filep) {

	const char *depth = mg_get_header(conn, "Depth");



	conn->must_close = 1;

	conn->status_code = 207;

	mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"

			"Connection: close\r\n"

			"Content-Type: text/xml; charset=utf-8\r\n\r\n");



	conn->num_bytes_sent += mg_printf(conn,

			"<?xml version=\"1.0\" encoding=\"utf-8\"?>"

			"<d:multistatus xmlns:d='DAV:'>\n");



	// Print properties for the requested resource itself

	print_props(conn, conn->request_info.uri, filep);



	// If it is a directory, print directory entries too if Depth is not 0

	if (filep->is_directory &&

			!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&

			(depth == NULL || strcmp(depth, "0") != 0)) {

		scan_directory(conn, path, conn, &print_dav_dir_entry);

	}



	conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");

}



#if defined(USE_WEBSOCKET)



// START OF SHA-1 code

// Copyright(c) By Steve Reid <steve@edmweb.com>

#define SHA1HANDSOFF

#if defined(__sun)

#include "solarisfixes.h"

#endif



union char64long16 { unsigned char c[64]; uint32_t l[16]; };



#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))



static uint32_t blk0(union char64long16 *block, int i) {

	// Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN

	if (!is_big_endian()) {

		block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |

			(rol(block->l[i], 8) & 0x00FF00FF);

	}

	return block->l[i];

}



#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \

			^block->l[(i+2)&15]^block->l[i&15],1))

#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);

#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);

#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);

#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);

#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);



typedef struct {

	uint32_t state[5];

	uint32_t count[2];

	unsigned char buffer[64];

} SHA1_CTX;



static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {

	uint32_t a, b, c, d, e;

	union char64long16 block[1];



	memcpy(block, buffer, 64);

	a = state[0];

	b = state[1];

	c = state[2];

	d = state[3];

	e = state[4];

	R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);

	R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);

	R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);

	R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);

	R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);

	R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);

	R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);

	R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);

	R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);

	R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);

	R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);

	R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);

	R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);

	R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);

	R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);

	R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);

	R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);

	R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);

	R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);

	R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);

	state[0] += a;

	state[1] += b;

	state[2] += c;

	state[3] += d;

	state[4] += e;

	a = b = c = d = e = 0;

	memset(block, '\0', sizeof(block));

}



static void SHA1Init(SHA1_CTX* context) {

	context->state[0] = 0x67452301;

	context->state[1] = 0xEFCDAB89;

	context->state[2] = 0x98BADCFE;

	context->state[3] = 0x10325476;

	context->state[4] = 0xC3D2E1F0;

	context->count[0] = context->count[1] = 0;

}



static void SHA1Update(SHA1_CTX* context, const unsigned char* data,

		uint32_t len) {

	uint32_t i, j;



	j = context->count[0];

	if ((context->count[0] += len << 3) < j)

		context->count[1]++;

	context->count[1] += (len>>29);

	j = (j >> 3) & 63;

	if ((j + len) > 63) {

		memcpy(&context->buffer[j], data, (i = 64-j));

		SHA1Transform(context->state, context->buffer);

		for ( ; i + 63 < len; i += 64) {

			SHA1Transform(context->state, &data[i]);

		}

		j = 0;

	}

	else i = 0;

	memcpy(&context->buffer[j], &data[i], len - i);

}



static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {

	unsigned i;

	unsigned char finalcount[8], c;



	for (i = 0; i < 8; i++) {

		finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]

					>> ((3-(i & 3)) * 8) ) & 255);

	}

	c = 0200;

	SHA1Update(context, &c, 1);

	while ((context->count[0] & 504) != 448) {

		c = 0000;

		SHA1Update(context, &c, 1);

	}

	SHA1Update(context, finalcount, 8);

	for (i = 0; i < 20; i++) {

		digest[i] = (unsigned char)

			((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);

	}

	memset(context, '\0', sizeof(*context));

	memset(&finalcount, '\0', sizeof(finalcount));

}

// END OF SHA1 CODE



static void base64_encode(const unsigned char *src, int src_len, char *dst) {

	static const char *b64 =

		"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

	int i, j, a, b, c;



	for (i = j = 0; i < src_len; i += 3) {

		a = src[i];

		b = i + 1 >= src_len ? 0 : src[i + 1];

		c = i + 2 >= src_len ? 0 : src[i + 2];



		dst[j++] = b64[a >> 2];

		dst[j++] = b64[((a & 3) << 4) | (b >> 4)];

		if (i + 1 < src_len) {

			dst[j++] = b64[(b & 15) << 2 | (c >> 6)];

		}

		if (i + 2 < src_len) {

			dst[j++] = b64[c & 63];

		}

	}

	while (j % 4 != 0) {

		dst[j++] = '=';

	}

	dst[j++] = '\0';

}



static void send_websocket_handshake(struct mg_connection *conn) {

	static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";

	char buf[100], sha[20], b64_sha[sizeof(sha) * 2];

	SHA1_CTX sha_ctx;



	mg_snprintf(conn, buf, sizeof(buf), "%s%s",

			mg_get_header(conn, "Sec-WebSocket-Key"), magic);

	SHA1Init(&sha_ctx);

	SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));

	SHA1Final((unsigned char *) sha, &sha_ctx);

	base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);

	mg_printf(conn, "%s%s%s",

			"HTTP/1.1 101 Switching Protocols\r\n"

			"Upgrade: websocket\r\n"

			"Connection: Upgrade\r\n"

			"Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");

}



static void read_websocket(struct mg_connection *conn) {

	unsigned char *buf = (unsigned char *) conn->buf + conn->request_len;

	int n, len, mask_len, body_len, discard_len;



	for (;;) {

		if ((body_len = conn->data_len - conn->request_len) >= 2) {

			len = buf[1] & 127;

			mask_len = buf[1] & 128 ? 4 : 0;

			if (len < 126) {

				conn->content_len = 2 + mask_len + len;

			} else if (len == 126 && body_len >= 4) {

				conn->content_len = 4 + mask_len + ((((int) buf[2]) << 8) + buf[3]);

			} else if (body_len >= 10) {

				conn->content_len = 10 + mask_len +

					(((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) +

					htonl(* (uint32_t *) &buf[6]);

			}

		}



		if (conn->content_len > 0) {

			if (conn->ctx->callbacks.websocket_data != NULL &&

					conn->ctx->callbacks.websocket_data(conn) == 0) {

				break;  // Callback signalled to exit

			}

			discard_len = conn->content_len > body_len ?

				body_len : (int) conn->content_len;

			memmove(buf, buf + discard_len, conn->data_len - discard_len);

			conn->data_len -= discard_len;

			conn->content_len = conn->consumed_content = 0;

		} else {

			n = pull(NULL, conn, conn->buf + conn->data_len,

					conn->buf_size - conn->data_len);

			if (n <= 0) {

				break;

			}

			conn->data_len += n;

		}

	}

}



static void handle_websocket_request(struct mg_connection *conn) {

	if (strcmp(mg_get_header(conn, "Sec-WebSocket-Version"), "13") != 0) {

		send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");

	} else if (conn->ctx->callbacks.websocket_connect != NULL &&

			conn->ctx->callbacks.websocket_connect(conn) != 0) {

		// Callback has returned non-zero, do not proceed with handshake

	} else {

		send_websocket_handshake(conn);

		if (conn->ctx->callbacks.websocket_ready != NULL) {

			conn->ctx->callbacks.websocket_ready(conn);

		}

		read_websocket(conn);

	}

}



static int is_websocket_request(const struct mg_connection *conn) {

	const char *host, *upgrade, *connection, *version, *key;



	host = mg_get_header(conn, "Host");

	upgrade = mg_get_header(conn, "Upgrade");

	connection = mg_get_header(conn, "Connection");

	key = mg_get_header(conn, "Sec-WebSocket-Key");

	version = mg_get_header(conn, "Sec-WebSocket-Version");



	return host != NULL && upgrade != NULL && connection != NULL &&

		key != NULL && version != NULL &&

		strstr(upgrade, "websocket") != NULL &&

		strstr(connection, "Upgrade") != NULL;

}

#endif // !USE_WEBSOCKET



static int isbyte(int n) {

	return n >= 0 && n <= 255;

}



static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {

	int n, a, b, c, d, slash = 32, len = 0;



	if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||

				sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&

			isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&

			slash >= 0 && slash < 33) {

		len = n;

		*net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;

		*mask = slash ? 0xffffffffU << (32 - slash) : 0;

	}



	return len;

}



static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {

	int throttle = 0;

	struct vec vec, val;

	uint32_t net, mask;

	char mult;

	double v;



	while ((spec = next_option(spec, &vec, &val)) != NULL) {

		mult = ',';

		if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||

				(lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {

			continue;

		}

		v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;

		if (vec.len == 1 && vec.ptr[0] == '*') {

			throttle = (int) v;

		} else if (parse_net(vec.ptr, &net, &mask) > 0) {

			if ((remote_ip & mask) == net) {

				throttle = (int) v;

			}

		} else if (match_prefix(vec.ptr, vec.len, uri) > 0) {

			throttle = (int) v;

		}

	}



	return throttle;

}



static uint32_t get_remote_ip(const struct mg_connection *conn) {

	return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);

}



#ifdef USE_LUA



#ifdef _WIN32

static void *mmap(void *addr, int64_t len, int prot, int flags, int fd,

		int offset) {

	HANDLE fh = (HANDLE) _get_osfhandle(fd);

	HANDLE mh = CreateFileMapping(fh, 0, PAGE_READONLY, 0, 0, 0);

	void *p = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, (size_t) len);

	CloseHandle(fh);

	CloseHandle(mh);

	return p;

}

#define munmap(x, y)  UnmapViewOfFile(x)

#define MAP_FAILED NULL

#define MAP_PRIVATE 0

#define PROT_READ 0

#else

#include <sys/mman.h>

#endif



static void lsp(struct mg_connection *conn, const char *p, int64_t len,

		lua_State *L) {

	int i, j, pos = 0;



	for (i = 0; i < len; i++) {

		if (p[i] == '<' && p[i + 1] == '?') {

			for (j = i + 1; j < len ; j++) {

				if (p[j] == '?' && p[j + 1] == '>') {

					mg_write(conn, p + pos, i - pos);

					if (luaL_loadbuffer(L, p + (i + 2), j - (i + 2), "") == LUA_OK) {

						lua_pcall(L, 0, LUA_MULTRET, 0);

					}

					pos = j + 2;

					i = pos - 1;

					break;

				}

			}

		}

	}



	if (i > pos) {

		mg_write(conn, p + pos, i - pos);

	}

}



static int lsp_mg_print(lua_State *L) {

	int i, num_args;

	const char *str;

	size_t size;

	struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));



	num_args = lua_gettop(L);

	for (i = 1; i <= num_args; i++) {

		if (lua_isstring(L, i)) {

			str = lua_tolstring(L, i, &size);

			mg_write(conn, str, size);

		}

	}



	return 0;

}



static int lsp_mg_read(lua_State *L) {

	struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));

	char buf[1024];

	int len = mg_read(conn, buf, sizeof(buf));



	lua_settop(L, 0);

	lua_pushlstring(L, buf, len);



	return 1;

}



static void reg_string(struct lua_State *L, const char *name, const char *val) {

	lua_pushstring(L, name);

	lua_pushstring(L, val);

	lua_rawset(L, -3);

}



static void reg_int(struct lua_State *L, const char *name, int val) {

	lua_pushstring(L, name);

	lua_pushinteger(L, val);

	lua_rawset(L, -3);

}



static void prepare_lua_environment(struct mg_connection *conn, lua_State *L) {

	const struct mg_request_info *ri = mg_get_request_info(conn);

	extern void luaL_openlibs(lua_State *);

	int i;



	luaL_openlibs(L);

#ifdef USE_LUA_SQLITE3

	{ extern int luaopen_lsqlite3(lua_State *); luaopen_lsqlite3(L); }

#endif



	// Register "print" function which calls mg_write()

	lua_pushlightuserdata(L, conn);

	lua_pushcclosure(L, lsp_mg_print, 1);

	lua_setglobal(L, "print");



	// Register mg_read()

	lua_pushlightuserdata(L, conn);

	lua_pushcclosure(L, lsp_mg_read, 1);

	lua_setglobal(L, "read");



	// Export request_info

	lua_newtable(L);

	reg_string(L, "request_method", ri->request_method);

	reg_string(L, "uri", ri->uri);

	reg_string(L, "http_version", ri->http_version);

	reg_string(L, "query_string", ri->query_string);

	reg_int(L, "remote_ip", ri->remote_ip);

	reg_int(L, "remote_port", ri->remote_port);

	reg_int(L, "num_headers", ri->num_headers);

	lua_pushstring(L, "http_headers");

	lua_newtable(L);

	for (i = 0; i < ri->num_headers; i++) {

		reg_string(L, ri->http_headers[i].name, ri->http_headers[i].value);

	}

	lua_rawset(L, -3);

	lua_setglobal(L, "request_info");

}



static void handle_lsp_request(struct mg_connection *conn, const char *path,

		struct file *filep) {

	void *p = NULL;

	lua_State *L = NULL;



	if (!mg_stat(conn, path, filep) || !mg_fopen(conn, path, "r", filep)) {

		send_http_error(conn, 404, "Not Found", "%s", "File not found");

	} else if (filep->membuf == NULL &&

			(p = mmap(NULL, (size_t) filep->size, PROT_READ, MAP_PRIVATE,

				  fileno(filep->fp), 0)) == MAP_FAILED) {

		send_http_error(conn, 500, http_500_error, "mmap(%s, %zu, %d): %s", path,

				(size_t) filep->size, fileno(filep->fp), strerror(errno));

	} else if ((L = luaL_newstate()) == NULL) {

		send_http_error(conn, 500, http_500_error, "%s", "luaL_newstate failed");

	} else {

		// We're not sending HTTP headers here, Lua page must do it.

		prepare_lua_environment(conn, L);

		if (conn->ctx->callbacks.init_lua != NULL) {

			conn->ctx->callbacks.init_lua(conn, L);

		}

		lsp(conn, filep->membuf == NULL ? p : filep->membuf, filep->size, L);

	}



	if (L) lua_close(L);

	if (p) munmap(p, filep->size);

	mg_fclose(filep);

}

#endif // USE_LUA



int mg_upload(struct mg_connection *conn, const char *destination_dir) {

	const char *content_type_header, *boundary_start;

	char buf[MG_BUF_LEN], path[PATH_MAX], fname[1024], boundary[100], *s;

	FILE *fp;

	int bl, n, i, j, headers_len, boundary_len, len = 0, num_uploaded_files = 0;



	// Request looks like this:

	//

	// POST /upload HTTP/1.1

	// Host: 127.0.0.1:8080

	// Content-Length: 244894

	// Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr

	//

	// ------WebKitFormBoundaryRVr

	// Content-Disposition: form-data; name="file"; filename="accum.png"

	// Content-Type: image/png

	//

	//  <89>PNG

	//  <PNG DATA>

	// ------WebKitFormBoundaryRVr



	// Extract boundary string from the Content-Type header

	if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||

			(boundary_start = strstr(content_type_header, "boundary=")) == NULL ||

			(sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&

			 sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||

			boundary[0] == '\0') {

		return num_uploaded_files;

	}



	boundary_len = strlen(boundary);

	bl = boundary_len + 4;  // \r\n--<boundary>

	for (;;) {

		// Pull in headers

		assert(len >= 0 && len <= (int) sizeof(buf));

		while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {

			len += n;

		}

		if ((headers_len = get_request_len(buf, len)) <= 0) {

			break;

		}



		// Fetch file name.

		fname[0] = '\0';

		for (i = j = 0; i < headers_len; i++) {

			if (buf[i] == '\r' && buf[i + 1] == '\n') {

				buf[i] = buf[i + 1] = '\0';

				// TODO(lsm): don't expect filename to be the 3rd field,

				// parse the header properly instead.

				sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",

						fname);

				j = i + 2;

			}

		}



		// Give up if the headers are not what we expect

		if (fname[0] == '\0') {

			break;

		}



		// Move data to the beginning of the buffer

		assert(len >= headers_len);

		memmove(buf, &buf[headers_len], len - headers_len);

		len -= headers_len;



		// We open the file with exclusive lock held. This guarantee us

		// there is no other thread can save into the same file simultaneously.

		fp = NULL;

		// Construct destination file name. Do not allow paths to have slashes.

		if ((s = strrchr(fname, '/')) == NULL) {

			s = fname;

		}

		// Open file in binary mode. TODO: set an exclusive lock.

		snprintf(path, sizeof(path), "%s/%s", destination_dir, s);

		if ((fp = fopen(path, "wb")) == NULL) {

			break;

		}



		// Read POST data, write into file until boundary is found.

		n = 0;

		do {

			len += n;

			for (i = 0; i < len - bl; i++) {

				if (!memcmp(&buf[i], "\r\n--", 4) &&

						!memcmp(&buf[i + 4], boundary, boundary_len)) {

					// Found boundary, that's the end of file data.

					fwrite(buf, 1, i, fp);

					fflush(fp);

					num_uploaded_files++;

					if (conn->ctx->callbacks.upload != NULL) {

						conn->ctx->callbacks.upload(conn, path);

					}

					memmove(buf, &buf[i + bl], len - (i + bl));

					len -= i + bl;

					break;

				}

			}

			if (len > bl) {

				fwrite(buf, 1, len - bl, fp);

				memmove(buf, &buf[len - bl], bl);

				len = bl;

			}

		} while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);

		fclose(fp);

	}



	return num_uploaded_files;

}



static int is_put_or_delete_request(const struct mg_connection *conn) {

	const char *s = conn->request_info.request_method;

	return s != NULL && (!strcmp(s, "PUT") || !strcmp(s, "DELETE"));

}



static int get_first_ssl_listener_index(const struct mg_context *ctx) {

	int i, index = -1;

	for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {

		index = ctx->listening_sockets[i].is_ssl ? i : -1;

	}

	return index;

}



static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {

	char host[1025];

	const char *host_header;



	if ((host_header = mg_get_header(conn, "Host")) == NULL ||

			sscanf(host_header, "%1024[^:]", host) == 0) {

		// Cannot get host from the Host: header. Fallback to our IP address.

		sockaddr_to_string(host, sizeof(host), &conn->client.lsa);

	}



	mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",

			host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].

				lsa.sin.sin_port), conn->request_info.uri);

}



// This is the heart of the Mongoose's logic.

// This function is called when the request is read, parsed and validated,

// and Mongoose must decide what action to take: serve a file, or

// a directory, or call embedded function, etcetera.

static void handle_request(struct mg_connection *conn) {

	struct mg_request_info *ri = &conn->request_info;

	char path[PATH_MAX];

	int uri_len, ssl_index;

	struct file file = STRUCT_FILE_INITIALIZER;



	if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {

		* ((char *) conn->request_info.query_string++) = '\0';

	}

	uri_len = (int) strlen(ri->uri);

	url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);

	remove_double_dots_and_double_slashes((char *) ri->uri);

	convert_uri_to_file_name(conn, path, sizeof(path), &file);

	conn->throttle = set_throttle(conn->ctx->config[THROTTLE],

			get_remote_ip(conn), ri->uri);



	DEBUG_TRACE(("%s", ri->uri));

	// Perform redirect and auth checks before calling begin_request() handler.

	// Otherwise, begin_request() would need to perform auth checks and redirects.

	if (!conn->client.is_ssl && conn->client.ssl_redir &&

			(ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {

		redirect_to_https_port(conn, ssl_index);

	} else if (!is_put_or_delete_request(conn) &&

			!check_authorization(conn, path)) {

		send_authorization_request(conn);

	} else if (conn->ctx->callbacks.begin_request != NULL &&

			conn->ctx->callbacks.begin_request(conn)) {

		// Do nothing, callback has served the request

#if defined(USE_WEBSOCKET)

	} else if (is_websocket_request(conn)) {

		handle_websocket_request(conn);

#endif

	} else if (!strcmp(ri->request_method, "OPTIONS")) {

		send_options(conn);

	} else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {

		send_http_error(conn, 404, "Not Found", "Not Found");

	} else if (is_put_or_delete_request(conn) &&

			(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||

			 is_authorized_for_put(conn) != 1)) {

		send_authorization_request(conn);

	} else if (!strcmp(ri->request_method, "PUT")) {

		put_file(conn, path);

	} else if (!strcmp(ri->request_method, "DELETE")) {

		if (mg_remove(path) == 0) {

			send_http_error(conn, 200, "OK", "%s", "");

		} else {

			send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,

					strerror(ERRNO));

		}

	} else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||

			must_hide_file(conn, path)) {

		send_http_error(conn, 404, "Not Found", "%s", "File not found");

	} else if (file.is_directory && ri->uri[uri_len - 1] != '/') {

		mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"

				"Location: %s/\r\n\r\n", ri->uri);

	} else if (!strcmp(ri->request_method, "PROPFIND")) {

		handle_propfind(conn, path, &file);

	} else if (file.is_directory &&

			!substitute_index_file(conn, path, sizeof(path), &file)) {

		if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {

			handle_directory_request(conn, path);

		} else {

			send_http_error(conn, 403, "Directory Listing Denied",

					"Directory listing denied");

		}

#ifdef USE_LUA

	} else if (match_prefix("**.lp$", 6, path) > 0) {

		handle_lsp_request(conn, path, &file);

#endif

#if !defined(NO_CGI)

	} else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],

				strlen(conn->ctx->config[CGI_EXTENSIONS]),

				path) > 0) {

		if (strcmp(ri->request_method, "POST") &&

				strcmp(ri->request_method, "HEAD") &&

				strcmp(ri->request_method, "GET")) {

			send_http_error(conn, 501, "Not Implemented",

					"Method %s is not implemented", ri->request_method);

		} else {

			handle_cgi_request(conn, path);

		}

#endif // !NO_CGI

	} else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],

				strlen(conn->ctx->config[SSI_EXTENSIONS]),

				path) > 0) {

		handle_ssi_file_request(conn, path);

	} else if (is_not_modified(conn, &file)) {

		send_http_error(conn, 304, "Not Modified", "%s", "");

	} else {

		handle_file_request(conn, path, &file);

	}

}



static void close_all_listening_sockets(struct mg_context *ctx) {

	int i;

	for (i = 0; i < ctx->num_listening_sockets; i++) {

		closesocket(ctx->listening_sockets[i].sock);

	}

	free(ctx->listening_sockets);

}



// Valid listening port specification is: [ip_address:]port[s]

// Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s

// TODO(lsm): add parsing of the IPv6 address

static int parse_port_string(const struct vec *vec, struct socket *so) {

	int a, b, c, d, port, len;



	// MacOS needs that. If we do not zero it, subsequent bind() will fail.

	// Also, all-zeroes in the socket address means binding to all addresses

	// for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).

	memset(so, 0, sizeof(*so));



	if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {

		// Bind to a specific IPv4 address

		so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);

	} else if (sscanf(vec->ptr, "%d%n", &port, &len) != 1 ||

			len <= 0 ||

			len > (int) vec->len ||

			(vec->ptr[len] && vec->ptr[len] != 's' &&

			 vec->ptr[len] != 'r' && vec->ptr[len] != ',')) {

		return 0;

	}



	so->is_ssl = vec->ptr[len] == 's';

	so->ssl_redir = vec->ptr[len] == 'r';

#if defined(USE_IPV6)

	so->lsa.sin6.sin6_family = AF_INET6;

	so->lsa.sin6.sin6_port = htons((uint16_t) port);

#else

	so->lsa.sin.sin_family = AF_INET;

	so->lsa.sin.sin_port = htons((uint16_t) port);

#endif



	return 1;

}



static int set_ports_option(struct mg_context *ctx) {

	const char *list = ctx->config[LISTENING_PORTS];

	int on = 1, success = 1;

	struct vec vec;

	struct socket so;



	while (success && (list = next_option(list, &vec, NULL)) != NULL) {

		if (!parse_port_string(&vec, &so)) {

			cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",

					__func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");

			success = 0;

		} else if (so.is_ssl && ctx->ssl_ctx == NULL) {

			cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");

			success = 0;

		} else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==

				INVALID_SOCKET ||

				// On Windows, SO_REUSEADDR is recommended only for

				// broadcast UDP sockets

				setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,

					(void *) &on, sizeof(on)) != 0 ||

				bind(so.sock, &so.lsa.sa, sizeof(so.lsa)) != 0 ||

				listen(so.sock, SOMAXCONN) != 0) {

			cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,

					(int) vec.len, vec.ptr, strerror(ERRNO));

			closesocket(so.sock);

			success = 0;

		} else {

			set_close_on_exec(so.sock);

			// TODO: handle realloc failure

			ctx->listening_sockets = realloc(ctx->listening_sockets,

					(ctx->num_listening_sockets + 1) *

					sizeof(ctx->listening_sockets[0]));

			ctx->listening_sockets[ctx->num_listening_sockets] = so;

			ctx->num_listening_sockets++;

		}

	}



	if (!success) {

		close_all_listening_sockets(ctx);

	}



	return success;

}



static void log_header(const struct mg_connection *conn, const char *header,

		FILE *fp) {

	const char *header_value;



	if ((header_value = mg_get_header(conn, header)) == NULL) {

		(void) fprintf(fp, "%s", " -");

	} else {

		(void) fprintf(fp, " \"%s\"", header_value);

	}

}



static void log_access(const struct mg_connection *conn) {

	const struct mg_request_info *ri;

	FILE *fp;

	char date[64], src_addr[20];



	fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ?  NULL :

		fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");



	if (fp == NULL)

		return;



	strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",

			localtime(&conn->birth_time));



	ri = &conn->request_info;

	flockfile(fp);



	sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);

	fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,

			src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,

			ri->request_method ? ri->request_method : "-",

			ri->uri ? ri->uri : "-", ri->http_version,

			conn->status_code, conn->num_bytes_sent);

	log_header(conn, "Referer", fp);

	log_header(conn, "User-Agent", fp);

	fputc('\n', fp);

	fflush(fp);



	funlockfile(fp);

	fclose(fp);

}



// Verify given socket address against the ACL.

// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.

static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {

	int allowed, flag;

	uint32_t net, mask;

	struct vec vec;

	const char *list = ctx->config[ACCESS_CONTROL_LIST];



	// If any ACL is set, deny by default

	allowed = list == NULL ? '+' : '-';



	while ((list = next_option(list, &vec, NULL)) != NULL) {

		flag = vec.ptr[0];

		if ((flag != '+' && flag != '-') ||

				parse_net(&vec.ptr[1], &net, &mask) == 0) {

			cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);

			return -1;

		}



		if (net == (remote_ip & mask)) {

			allowed = flag;

		}

	}



	return allowed == '+';

}



#if !defined(_WIN32)

static int set_uid_option(struct mg_context *ctx) {

	struct passwd *pw;

	const char *uid = ctx->config[RUN_AS_USER];

	int success = 0;



	if (uid == NULL) {

		success = 1;

	} else {

		if ((pw = getpwnam(uid)) == NULL) {

			cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);

		} else if (setgid(pw->pw_gid) == -1) {

			cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));

		} else if (setuid(pw->pw_uid) == -1) {

			cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));

		} else {

			success = 1;

		}

	}



	return success;

}

#endif // !_WIN32



#if !defined(NO_SSL)

static pthread_mutex_t *ssl_mutexes;



static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {

	return (conn->ssl = SSL_new(s)) != NULL &&

		SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&

		func(conn->ssl) == 1;

}



// Return OpenSSL error message

static const char *ssl_error(void) {

	unsigned long err;

	err = ERR_get_error();

	return err == 0 ? "" : ERR_error_string(err, NULL);

}



static void ssl_locking_callback(int mode, int mutex_num, const char *file,

		int line) {

	(void) line;

	(void) file;



	if (mode & 1) {  // 1 is CRYPTO_LOCK

		(void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);

	} else {

		(void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);

	}

}



static unsigned long ssl_id_callback(void) {

	return (unsigned long) pthread_self();

}



#if !defined(NO_SSL_DL)

static int load_dll(struct mg_context *ctx, const char *dll_name,

		struct ssl_func *sw) {

	union {void *p; void (*fp)(void);} u;

	void  *dll_handle;

	struct ssl_func *fp;



	if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {

		cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);

		return 0;

	}



	for (fp = sw; fp->name != NULL; fp++) {

#ifdef _WIN32

		// GetProcAddress() returns pointer to function

		u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);

#else

		// dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to

		// function pointers. We need to use a union to make a cast.

		u.p = dlsym(dll_handle, fp->name);

#endif // _WIN32

		if (u.fp == NULL) {

			cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);

			return 0;

		} else {

			fp->ptr = u.fp;

		}

	}



	return 1;

}

#endif // NO_SSL_DL



// Dynamically load SSL library. Set up ctx->ssl_ctx pointer.

static int set_ssl_option(struct mg_context *ctx) {

	int i, size;

	const char *pem;



	// If PEM file is not specified, skip SSL initialization.

	if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL) {

		return 1;

	}



#if !defined(NO_SSL_DL)

	if (!load_dll(ctx, SSL_LIB, ssl_sw) ||

			!load_dll(ctx, CRYPTO_LIB, crypto_sw)) {

		return 0;

	}

#endif // NO_SSL_DL



	// Initialize SSL library

	SSL_library_init();

	SSL_load_error_strings();



	if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {

		cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());

		return 0;

	}



	// If user callback returned non-NULL, that means that user callback has

	// set up certificate itself. In this case, skip sertificate setting.

	if ((ctx->callbacks.init_ssl == NULL ||

				!ctx->callbacks.init_ssl(ctx->ssl_ctx)) &&

			(SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0 ||

			 SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0)) {

		cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());

		return 0;

	}



	if (pem != NULL) {

		(void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);

	}



	// Initialize locking callbacks, needed for thread safety.

	// http://www.openssl.org/support/faq.html#PROG1

	size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();

	if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {

		cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());

		return 0;

	}



	for (i = 0; i < CRYPTO_num_locks(); i++) {

		pthread_mutex_init(&ssl_mutexes[i], NULL);

	}



	CRYPTO_set_locking_callback(&ssl_locking_callback);

	CRYPTO_set_id_callback(&ssl_id_callback);



	return 1;

}



static void uninitialize_ssl(struct mg_context *ctx) {

	int i;

	if (ctx->ssl_ctx != NULL) {

		CRYPTO_set_locking_callback(NULL);

		for (i = 0; i < CRYPTO_num_locks(); i++) {

			pthread_mutex_destroy(&ssl_mutexes[i]);

		}

		CRYPTO_set_locking_callback(NULL);

		CRYPTO_set_id_callback(NULL);

	}

}

#endif // !NO_SSL



static int set_gpass_option(struct mg_context *ctx) {

	struct file file = STRUCT_FILE_INITIALIZER;

	const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];

	if (path != NULL && !mg_stat(fc(ctx), path, &file)) {

		cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));

		return 0;

	}

	return 1;

}



static int set_acl_option(struct mg_context *ctx) {

	return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;

}



static void reset_per_request_attributes(struct mg_connection *conn) {

	conn->path_info = NULL;

	conn->num_bytes_sent = conn->consumed_content = 0;

	conn->status_code = -1;

	conn->must_close = conn->request_len = conn->throttle = 0;

}



static void close_socket_gracefully(struct mg_connection *conn) {

#if defined(_WIN32)

	char buf[MG_BUF_LEN];

	int n;

#endif

	struct linger linger;



	// Set linger option to avoid socket hanging out after close. This prevent

	// ephemeral port exhaust problem under high QPS.

	linger.l_onoff = 1;

	linger.l_linger = 1;

	setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,

			(char *) &linger, sizeof(linger));



	// Send FIN to the client

	shutdown(conn->client.sock, SHUT_WR);

	set_non_blocking_mode(conn->client.sock);



#if defined(_WIN32)

	// Read and discard pending incoming data. If we do not do that and close the

	// socket, the data in the send buffer may be discarded. This

	// behaviour is seen on Windows, when client keeps sending data

	// when server decides to close the connection; then when client

	// does recv() it gets no data back.

	do {

		n = pull(NULL, conn, buf, sizeof(buf));

	} while (n > 0);

#endif



	// Now we know that our FIN is ACK-ed, safe to close

	closesocket(conn->client.sock);

}



static void close_connection(struct mg_connection *conn) {

	conn->must_close = 1;

	if (conn->client.sock != INVALID_SOCKET) {

		close_socket_gracefully(conn);

	}

#ifndef NO_SSL

	// Must be done AFTER socket is closed

	if (conn->ssl != NULL) {

		SSL_free(conn->ssl);

	}

#endif

}



void mg_close_connection(struct mg_connection *conn) {

#ifndef NO_SSL

	if (conn->client_ssl_ctx != NULL) {

		SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);

	}

#endif

	close_connection(conn);

	free(conn);

}



struct mg_connection *mg_connect(const char *host, int port, int use_ssl,

		char *ebuf, size_t ebuf_len) {

	static struct mg_context fake_ctx;

	struct mg_connection *conn = NULL;

	struct sockaddr_in sin;

	struct hostent *he;

	int sock;



	if (host == NULL) {

		snprintf(ebuf, ebuf_len, "%s", "NULL host");

	} else if (use_ssl && SSLv23_client_method == NULL) {

		snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized");

	} else if ((he = gethostbyname(host)) == NULL) {

		snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO));

	} else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {

		snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO));

	} else {

		sin.sin_family = AF_INET;

		sin.sin_port = htons((uint16_t) port);

		sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];

		if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {

			snprintf(ebuf, ebuf_len, "connect(%s:%d): %s",

					host, port, strerror(ERRNO));

			closesocket(sock);

		} else if ((conn = (struct mg_connection *)

					calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {

			snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));

			closesocket(sock);

#ifndef NO_SSL

		} else if (use_ssl && (conn->client_ssl_ctx =

					SSL_CTX_new(SSLv23_client_method())) == NULL) {

			snprintf(ebuf, ebuf_len, "SSL_CTX_new error");

			closesocket(sock);

			free(conn);

			conn = NULL;

#endif // NO_SSL

		} else {

			conn->buf_size = MAX_REQUEST_SIZE;

			conn->buf = (char *) (conn + 1);

			conn->ctx = &fake_ctx;

			conn->client.sock = sock;

			conn->client.rsa.sin = sin;

			conn->client.is_ssl = use_ssl;

#ifndef NO_SSL

			if (use_ssl) {

				// SSL_CTX_set_verify call is needed to switch off server certificate

				// checking, which is off by default in OpenSSL and on in yaSSL.

				SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);

				sslize(conn, conn->client_ssl_ctx, SSL_connect);

			}

#endif

		}

	}



	return conn;

}



static int is_valid_uri(const char *uri) {

	// Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2

	// URI can be an asterisk (*) or should start with slash.

	return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');

}

static getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {

	const char *cl;

	FILE *f7;

<<<<<<< HEAD
	char *post_buf = NULL, *compare = "-11";

=======
	char *post_buf = NULL, *compare = "-111";

>>>>>>> origin/master
	int write_result;

	f7 = fopen("getreq.txt","a");

	fprintf(f7," In the getreq");

	ebuf[0] = '\0';

	reset_per_request_attributes(conn);

	conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,

			&conn->data_len);

	assert(conn->request_len < 0 || conn->data_len >= conn->request_len);



//	fprintf(f7,"\n length:%d \nbuf: %s , \ndata_len:%d\n request_len: %d \n userdata: %s",conn->content_len, conn->buf, conn->data_len, conn-> request_len, (char*)conn->request_info.user_data );



//	fprintf(f7,"new POST DATA: %s", conn->buf+(conn->request_len));

	post_buf = malloc((conn->data_len) - (conn->request_len));

	memcpy(post_buf, conn->buf+(conn->request_len), (conn->data_len) - (conn->request_len));

	fprintf(f7, " after memcpy: %s and data_len: %d , request_len: %d",post_buf, conn->data_len,conn->request_len ); 

	if (conn->request_len == 0 && conn->data_len == conn->buf_size) {

		snprintf(ebuf, ebuf_len, "%s", "Request Too Large");

	} if (conn->request_len <= 0) {

		snprintf(ebuf, ebuf_len, "%s", "Client closed connection");

	} else if (parse_http_message(conn->buf, conn->buf_size,

				&conn->request_info) <= 0) {

		snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);

	} else {

		// Request is valid

		if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {

			conn->content_len = strtoll(cl, NULL, 10);

		} else if (!mg_strcasecmp(conn->request_info.request_method, "POST") ||

				!mg_strcasecmp(conn->request_info.request_method, "PUT")) {

			conn->content_len = -1;

		} else {

			conn->content_len = 0;

		}

		conn->birth_time = time(NULL);

	}

//	fprintf(f7,"\n length:%d \nbuf: %s , \ndata_len:%d\n request_len: %d \n userdata: %s",conn->content_len, conn->buf, conn->data_len, conn-> request_len, (char*)conn->request_info.user_data );

      	fprintf(f7,"content_length: %d", conn-> content_len); 

	if( (memcmp(post_buf, compare,4)) == 0 ){

		free(post_buf);

		fprintf(f7,"And it is\n");

		}

	else{

		write_result = write(mg_out, post_buf, (conn->data_len ) - (conn->request_len));

		if(write_result >= 0)

		{

			free(post_buf);

			fprintf(f7,"Wriiten successfully  %d bytes\n", write_result);

		}

		if(write_result == -1){

			free(post_buf);

			fprintf(f7,"An Error occured while writting to rsync server");

			}

		}

		fclose(f7);

	return ebuf[0] == '\0';

}



struct mg_connection *mg_download(const char *host, int port, int use_ssl,

		char *ebuf, size_t ebuf_len,

		const char *fmt, ...) {

	struct mg_connection *conn;

	va_list ap;



	va_start(ap, fmt);

	ebuf[0] = '\0';

	if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {

	} else if (mg_vprintf(conn, fmt, ap) <= 0) {

		snprintf(ebuf, ebuf_len, "%s", "Error sending request");

	} else {

		getreq(conn, ebuf, ebuf_len);

	}

	if (ebuf[0] != '\0' && conn != NULL) {

		mg_close_connection(conn);

		conn = NULL;

	}



	return conn;

}



static void process_new_connection(struct mg_connection *conn) {

	struct mg_request_info *ri = &conn->request_info;

	int keep_alive_enabled, keep_alive, discard_len;

	char ebuf[100];



	keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");

	keep_alive = 0;



	// Important: on new connection, reset the receiving buffer. Credit goes

	// to crule42.

	conn->data_len = 0;

	do {

		if (!getreq(conn, ebuf, sizeof(ebuf))) {

			send_http_error(conn, 500, "Server Error", "%s", ebuf);

		} else if (!is_valid_uri(conn->request_info.uri)) {

			snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);

			send_http_error(conn, 400, "Bad Request", "%s", ebuf);

		} else if (strcmp(ri->http_version, "1.0") &&

				strcmp(ri->http_version, "1.1")) {

			snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);

			send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);

		}



		if (ebuf[0] == '\0') {

			handle_request(conn);

			if (conn->ctx->callbacks.end_request != NULL) {

				conn->ctx->callbacks.end_request(conn, conn->status_code);

			}

			log_access(conn);

		}

		if (ri->remote_user != NULL) {

			free((void *) ri->remote_user);

		}



		// NOTE(lsm): order is important here. should_keep_alive() call

		// is using parsed request, which will be invalid after memmove's below.

		// Therefore, memorize should_keep_alive() result now for later use

		// in loop exit condition.

		keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&

			conn->content_len >= 0 && should_keep_alive(conn);



		// Discard all buffered data for this request

		discard_len = conn->content_len >= 0 && conn->request_len > 0 &&

			conn->request_len + conn->content_len < (int64_t) conn->data_len ?

			(int) (conn->request_len + conn->content_len) : conn->data_len;

		assert(discard_len >= 0);

		memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);

		conn->data_len -= discard_len;

		assert(conn->data_len >= 0);

		assert(conn->data_len <= conn->buf_size);

	} while (keep_alive);

}



// Worker threads take accepted socket from the queue

static int consume_socket(struct mg_context *ctx, struct socket *sp) {

	(void) pthread_mutex_lock(&ctx->mutex);

	DEBUG_TRACE(("going idle"));



	// If the queue is empty, wait. We're idle at this point.

	while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {

		pthread_cond_wait(&ctx->sq_full, &ctx->mutex);

	}



	// If we're stopping, sq_head may be equal to sq_tail.

	if (ctx->sq_head > ctx->sq_tail) {

		// Copy socket from the queue and increment tail

		*sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];

		ctx->sq_tail++;

		DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));



		// Wrap pointers if needed

		while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {

			ctx->sq_tail -= ARRAY_SIZE(ctx->queue);

			ctx->sq_head -= ARRAY_SIZE(ctx->queue);

		}

	}



	(void) pthread_cond_signal(&ctx->sq_empty);

	(void) pthread_mutex_unlock(&ctx->mutex);



	return !ctx->stop_flag;

}



static void *worker_thread(void *thread_func_param) {

	struct mg_context *ctx = thread_func_param;

	struct mg_connection *conn;



	conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);

	if (conn == NULL) {

		cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");

	} else {

		conn->buf_size = MAX_REQUEST_SIZE;

		conn->buf = (char *) (conn + 1);

		conn->ctx = ctx;

		conn->request_info.user_data = ctx->user_data;



		// Call consume_socket() even when ctx->stop_flag > 0, to let it signal

		// sq_empty condvar to wake up the master waiting in produce_socket()

		while (consume_socket(ctx, &conn->client)) {

			conn->birth_time = time(NULL);



			// Fill in IP, port info early so even if SSL setup below fails,

			// error handler would have the corresponding info.

			// Thanks to Johannes Winkelmann for the patch.

			// TODO(lsm): Fix IPv6 case

			conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);

			memcpy(&conn->request_info.remote_ip,

					&conn->client.rsa.sin.sin_addr.s_addr, 4);

			conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);

			conn->request_info.is_ssl = conn->client.is_ssl;



			if (!conn->client.is_ssl

#ifndef NO_SSL

					|| sslize(conn, conn->ctx->ssl_ctx, SSL_accept)

#endif

			   ) {

				process_new_connection(conn);

			}



			close_connection(conn);

		}

		free(conn);

	}



	// Signal master that we're done with connection and exiting

	(void) pthread_mutex_lock(&ctx->mutex);

	ctx->num_threads--;

	(void) pthread_cond_signal(&ctx->cond);

	assert(ctx->num_threads >= 0);

	(void) pthread_mutex_unlock(&ctx->mutex);



	DEBUG_TRACE(("exiting"));

	return NULL;

}



// Master thread adds accepted socket to a queue

static void produce_socket(struct mg_context *ctx, const struct socket *sp) {

	(void) pthread_mutex_lock(&ctx->mutex);



	// If the queue is full, wait

	while (ctx->stop_flag == 0 &&

			ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {

		(void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);

	}



	if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {

		// Copy socket to the queue and increment head

		ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;

		ctx->sq_head++;

		DEBUG_TRACE(("queued socket %d", sp->sock));

	}



	(void) pthread_cond_signal(&ctx->sq_full);

	(void) pthread_mutex_unlock(&ctx->mutex);

}



static int set_sock_timeout(SOCKET sock, int milliseconds) {

#ifdef _WIN32

	DWORD t = milliseconds;

#else

	struct timeval t;

	t.tv_sec = milliseconds / 1000;

	t.tv_usec = (milliseconds * 1000) % 1000000;

#endif

	return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||

		setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));

}



static void accept_new_connection(const struct socket *listener,

		struct mg_context *ctx) {

	struct socket so;

	char src_addr[20];

	socklen_t len = sizeof(so.rsa);

	int on = 1;



	if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {

	} else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {

		sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);

		cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);

		closesocket(so.sock);

	} else {

		// Put so socket structure into the queue

		DEBUG_TRACE(("Accepted socket %d", (int) so.sock));

		so.is_ssl = listener->is_ssl;

		so.ssl_redir = listener->ssl_redir;

		getsockname(so.sock, &so.lsa.sa, &len);

		// Set TCP keep-alive. This is needed because if HTTP-level keep-alive

		// is enabled, and client resets the connection, server won't get

		// TCP FIN or RST and will keep the connection open forever. With TCP

		// keep-alive, next keep-alive handshake will figure out that the client

		// is down and will close the server end.

		// Thanks to Igor Klopov who suggested the patch.

		setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));

		set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));

		produce_socket(ctx, &so);

	}

}



static void *master_thread(void *thread_func_param) {

	struct mg_context *ctx = thread_func_param;

	struct pollfd *pfd;

	int i;



	// Increase priority of the master thread

#if defined(_WIN32)

	SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);

#endif



#if defined(ISSUE_317)

	struct sched_param sched_param;

	sched_param.sched_priority = sched_get_priority_max(SCHED_RR);

	pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);

#endif



	pfd = calloc(ctx->num_listening_sockets, sizeof(pfd[0]));

	while (ctx->stop_flag == 0) {

		for (i = 0; i < ctx->num_listening_sockets; i++) {

			pfd[i].fd = ctx->listening_sockets[i].sock;

			pfd[i].events = POLLIN;

		}



		if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {

			for (i = 0; i < ctx->num_listening_sockets; i++) {

				if (ctx->stop_flag == 0 && pfd[i].revents == POLLIN) {

					accept_new_connection(&ctx->listening_sockets[i], ctx);

				}

			}

		}

	}

	free(pfd);

	DEBUG_TRACE(("stopping workers"));



	// Stop signal received: somebody called mg_stop. Quit.

	close_all_listening_sockets(ctx);



	// Wakeup workers that are waiting for connections to handle.

	pthread_cond_broadcast(&ctx->sq_full);



	// Wait until all threads finish

	(void) pthread_mutex_lock(&ctx->mutex);

	while (ctx->num_threads > 0) {

		(void) pthread_cond_wait(&ctx->cond, &ctx->mutex);

	}

	(void) pthread_mutex_unlock(&ctx->mutex);



	// All threads exited, no sync is needed. Destroy mutex and condvars

	(void) pthread_mutex_destroy(&ctx->mutex);

	(void) pthread_cond_destroy(&ctx->cond);

	(void) pthread_cond_destroy(&ctx->sq_empty);

	(void) pthread_cond_destroy(&ctx->sq_full);



#if !defined(NO_SSL)

	uninitialize_ssl(ctx);

#endif

	DEBUG_TRACE(("exiting"));



	// Signal mg_stop() that we're done.

	// WARNING: This must be the very last thing this

	// thread does, as ctx becomes invalid after this line.

	ctx->stop_flag = 2;

	return NULL;

}



static void free_context(struct mg_context *ctx) {

	int i;



	// Deallocate config parameters

	for (i = 0; i < NUM_OPTIONS; i++) {

		if (ctx->config[i] != NULL)

			free(ctx->config[i]);

	}



#ifndef NO_SSL

	// Deallocate SSL context

	if (ctx->ssl_ctx != NULL) {

		SSL_CTX_free(ctx->ssl_ctx);

	}

	if (ssl_mutexes != NULL) {

		free(ssl_mutexes);

		ssl_mutexes = NULL;

	}

#endif // !NO_SSL



	// Deallocate context itself

	free(ctx);

}



void mg_stop(struct mg_context *ctx) {

	ctx->stop_flag = 1;



	// Wait until mg_fini() stops

	while (ctx->stop_flag != 2) {

		(void) mg_sleep(10);

	}

	free_context(ctx);



#if defined(_WIN32) && !defined(__SYMBIAN32__)

	(void) WSACleanup();

#endif // _WIN32

}



struct mg_context *mg_start(const struct mg_callbacks *callbacks,

		void *user_data,

		const char **options) {

	struct mg_context *ctx;

	const char *name, *value, *default_value;

	int i;



#if defined(_WIN32) && !defined(__SYMBIAN32__)

	WSADATA data;

	WSAStartup(MAKEWORD(2,2), &data);

	InitializeCriticalSection(&global_log_file_lock);

#endif // _WIN32



	// Allocate context and initialize reasonable general case defaults.

	// TODO(lsm): do proper error handling here.

	if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {

		return NULL;

	}

	ctx->callbacks = *callbacks;

	ctx->user_data = user_data;



	while (options && (name = *options++) != NULL) {

		if ((i = get_option_index(name)) == -1) {

			cry(fc(ctx), "Invalid option: %s", name);

			free_context(ctx);

			return NULL;

		} else if ((value = *options++) == NULL) {

			cry(fc(ctx), "%s: option value cannot be NULL", name);

			free_context(ctx);

			return NULL;

		}

		if (ctx->config[i] != NULL) {

			cry(fc(ctx), "warning: %s: duplicate option", name);

			free(ctx->config[i]);

		}

		ctx->config[i] = mg_strdup(value);

		DEBUG_TRACE(("[%s] -> [%s]", name, value));

	}



	// Set default value if needed

	for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) {

		default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2];

		if (ctx->config[i] == NULL && default_value != NULL) {

			ctx->config[i] = mg_strdup(default_value);

			DEBUG_TRACE(("Setting default: [%s] -> [%s]",

						config_options[i * ENTRIES_PER_CONFIG_OPTION + 1],

						default_value));

		}

	}



	// NOTE(lsm): order is important here. SSL certificates must

	// be initialized before listening ports. UID must be set last.

	if (!set_gpass_option(ctx) ||

#if !defined(NO_SSL)

			!set_ssl_option(ctx) ||

#endif

			!set_ports_option(ctx) ||

#if !defined(_WIN32)

			!set_uid_option(ctx) ||

#endif

			!set_acl_option(ctx)) {

		free_context(ctx);

		return NULL;

	}



#if !defined(_WIN32) && !defined(__SYMBIAN32__)

	// Ignore SIGPIPE signal, so if browser cancels the request, it

	// won't kill the whole process.

	(void) signal(SIGPIPE, SIG_IGN);

	// Also ignoring SIGCHLD to let the OS to reap zombies properly.

	(void) signal(SIGCHLD, SIG_IGN);

#endif // !_WIN32



	(void) pthread_mutex_init(&ctx->mutex, NULL);

	(void) pthread_cond_init(&ctx->cond, NULL);

	(void) pthread_cond_init(&ctx->sq_empty, NULL);

	(void) pthread_cond_init(&ctx->sq_full, NULL);



	// Start master (listening) thread

	mg_start_thread(master_thread, ctx);



	// Start worker threads

	for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {

		if (mg_start_thread(worker_thread, ctx) != 0) {

			cry(fc(ctx), "Cannot start worker thread: %d", ERRNO);

		} else {

			ctx->num_threads++;

		}

	}



	return ctx;

}





static int begin_request_handler(struct mg_connection *conn) {

	const struct mg_request_info *request_info = mg_get_request_info(conn);



	FILE *fp;

	int count =0, read_result = 0, ioctl_result = -1;

<<<<<<< HEAD
	char buf[70000], byte = '\0';

	int i = 0, n_read = 0, post_data_len = 0;

	fp = fopen("testhello.txt","a");

 	set_nonblocking(mg_in);

        ioctl_result = ioctl(mg_in, FIONREAD, &count); 



	if(ioctl_result != 0)

		fprintf(fp,"\n Error in ioctl call");

	else 

		fprintf(fp,"\n NO Error in ioctl call");



	if(count == 0)

	{

		//buf = malloc(4);

		//buf = "-111";

		strcpy(buf,"-11");

		post_data_len = 4;

	}

	else{

		//buf = malloc(count);

		read_result = read(mg_in,buf, count );

		if(read_result == -1)

			fprintf(fp,"\n Error while reading from rsync server in http server");

		else

			post_data_len = count;

	}

	fprintf(fp,"count after: %d and  read returns: %d", count, read_result);



	while(i < post_data_len)

	{

=======
	char buf[1024], byte = '\0';

	int i = 0, n_read = 0, post_data_len = 0;

	fp = fopen("testhello.txt","a");

 	set_nonblocking(mg_in);

	/*if((read(mg_in, &byte, 1)) == 1)

	{

		ioctl(mg_in, FIONREAD, &count);

		buf = malloc(count+1);

		buf[0] = byte;

		n_read = read(mg_in, buf+1, count);



	}*/

        ioctl_result = ioctl(mg_in, FIONREAD, &count); 



	if(ioctl_result != 0)

		fprintf(fp,"\n Error in ioctl call");

	else 

		fprintf(fp,"\n NO Error in ioctl call");



	if(count == 0)

	{

		//buf = malloc(4);

		//buf = "-111";

		strcpy(buf,"-111");

		post_data_len = 4;

	}

	else{

		//buf = malloc(count);

		read_result = read(mg_in,buf, count );

		if(read_result == -1)

			fprintf(fp,"\n Error while reading from rsync server in http server");

		else

			post_data_len = count;

	}

	fprintf(fp,"count after: %d and  read returns: %d", count, read_result);



	while(i < post_data_len)

	{

>>>>>>> origin/master
		buf[i] = buf[i] + 1;

		i++;

	}



	fprintf(fp,"\nbuf: %s and size: %d ", buf, count);

	fclose(fp);



	mg_printf(conn,

			"HTTP/1.1 200 OK\r\n"

			"Content-Type: text/plain\r\n"

			"Content-Length: %d\r\n"        // Always set Content-Length

			"\r\n"

			"%s",

			post_data_len, buf);

	//free(buf);

	return 1;

}



void mg_main(int port,int mg_fd_in ,int mg_fd_out) {



	int portn ;

	portn = port;

	int exit_mongoose =0;

	mg_in = mg_fd_in ;

	mg_out = mg_fd_out ;



	struct mg_context *ctx;

	struct mg_callbacks callbacks;



	char  portnostr[6] ;

	snprintf(portnostr,sizeof(portnostr),"%d",portn);

<<<<<<< HEAD
	const char *options[] = {"listening_ports","8080s","ssl_certificate","/home/ajay/server.pem", NULL};

=======
	const char *options[] = {"listening_ports","8080", NULL};

>>>>>>> origin/master


	memset(&callbacks, 0, sizeof(callbacks));

	callbacks.begin_request = begin_request_handler;



	// Start the web server.

	ctx = mg_start(&callbacks, NULL, options);



	while (!exit_mongoose);

	//getchar();  // Wait until user hits "enter"

	mg_stop(ctx);

	return 0;

}