/src/network/tcp.c
C | 521 lines | 374 code | 79 blank | 68 comment | 109 complexity | 65fcb4c2d901fae1698fa54fe3434cb4 MD5 | raw file
- /*****************************************************************************
- * tcp.c:
- *****************************************************************************
- * Copyright (C) 2004-2005 VLC authors and VideoLAN
- * Copyright (C) 2005-2006 Rémi Denis-Courmont
- * $Id: 6b592e93562188b2d99f3b52ee717384841fdc85 $
- *
- * Authors: Laurent Aimar <fenrir@videolan.org>
- * Rémi Denis-Courmont <rem # videolan.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation; either version 2.1 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <errno.h>
- #include <assert.h>
- #include <unistd.h>
- #ifdef HAVE_POLL
- # include <poll.h>
- #endif
- #include <vlc_network.h>
- #if defined (_WIN32)
- # undef EINPROGRESS
- # define EINPROGRESS WSAEWOULDBLOCK
- # undef EWOULDBLOCK
- # define EWOULDBLOCK WSAEWOULDBLOCK
- # undef EAGAIN
- # define EAGAIN WSAEWOULDBLOCK
- #endif
- #include <vlc_interrupt.h>
- static int SocksNegotiate( vlc_object_t *, int fd, int i_socks_version,
- const char *psz_user, const char *psz_passwd );
- static int SocksHandshakeTCP( vlc_object_t *,
- int fd, int i_socks_version,
- const char *psz_user, const char *psz_passwd,
- const char *psz_host, int i_port );
- extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
- int i_protocol );
- #undef net_Connect
- /*****************************************************************************
- * net_Connect:
- *****************************************************************************
- * Open a network connection.
- * @return socket handler or -1 on error.
- *****************************************************************************/
- int net_Connect( vlc_object_t *p_this, const char *psz_host, int i_port,
- int type, int proto )
- {
- const char *psz_realhost;
- char *psz_socks;
- int i_realport, i_handle = -1;
- psz_socks = var_InheritString( p_this, "socks" );
- if( psz_socks != NULL )
- {
- char *psz = strchr( psz_socks, ':' );
- if( psz )
- *psz++ = '\0';
- psz_realhost = psz_socks;
- i_realport = ( psz != NULL ) ? atoi( psz ) : 1080;
- msg_Dbg( p_this, "net: connecting to %s port %d (SOCKS) "
- "for %s port %d", psz_realhost, i_realport,
- psz_host, i_port );
- /* We only implement TCP with SOCKS */
- switch( type )
- {
- case 0:
- type = SOCK_STREAM;
- case SOCK_STREAM:
- break;
- default:
- msg_Err( p_this, "Socket type not supported through SOCKS" );
- free( psz_socks );
- return -1;
- }
- switch( proto )
- {
- case 0:
- proto = IPPROTO_TCP;
- case IPPROTO_TCP:
- break;
- default:
- msg_Err( p_this, "Transport not supported through SOCKS" );
- free( psz_socks );
- return -1;
- }
- }
- else
- {
- psz_realhost = psz_host;
- i_realport = i_port;
- msg_Dbg( p_this, "net: connecting to %s port %d", psz_realhost,
- i_realport );
- }
- struct addrinfo hints = {
- .ai_socktype = type,
- .ai_protocol = proto,
- .ai_flags = AI_NUMERICSERV | AI_IDN,
- }, *res;
- int val = vlc_getaddrinfo (psz_realhost, i_realport, &hints, &res);
- if (val)
- {
- msg_Err (p_this, "cannot resolve %s port %d : %s", psz_realhost,
- i_realport, gai_strerror (val));
- free( psz_socks );
- return -1;
- }
- free( psz_socks );
- int timeout = var_InheritInteger (p_this, "ipv4-timeout");
- if (timeout < 0)
- timeout = -1;
- for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
- {
- int fd = net_Socket( p_this, ptr->ai_family,
- ptr->ai_socktype, ptr->ai_protocol );
- if( fd == -1 )
- {
- msg_Dbg( p_this, "socket error: %s", vlc_strerror_c(net_errno) );
- continue;
- }
- if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) )
- {
- if( net_errno != EINPROGRESS && errno != EINTR )
- {
- msg_Err( p_this, "connection failed: %s",
- vlc_strerror_c(net_errno) );
- goto next_ai;
- }
- struct pollfd ufd;
- ufd.fd = fd;
- ufd.events = POLLOUT;
- do /* NOTE: timeout screwed up if we catch a signal (EINTR) */
- {
- if (vlc_killed())
- goto next_ai;
- val = vlc_poll_i11e(&ufd, 1, timeout);
- }
- while (val == -1 && errno == EINTR);
- switch (val)
- {
- case -1: /* error */
- msg_Err (p_this, "polling error: %s",
- vlc_strerror_c(net_errno));
- goto next_ai;
- case 0: /* timeout */
- msg_Warn (p_this, "connection timed out");
- goto next_ai;
- }
- /* There is NO WAY around checking SO_ERROR.
- * Don't ifdef it out!!! */
- if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &val,
- &(socklen_t){ sizeof (val) }) || val)
- {
- msg_Err (p_this, "connection failed: %s",
- vlc_strerror_c(val));
- goto next_ai;
- }
- }
- msg_Dbg( p_this, "connection succeeded (socket = %d)", fd );
- i_handle = fd; /* success! */
- break;
- next_ai: /* failure */
- net_Close( fd );
- }
- freeaddrinfo( res );
- if( i_handle == -1 )
- return -1;
- if( psz_socks != NULL )
- {
- /* NOTE: psz_socks already free'd! */
- char *psz_user = var_InheritString( p_this, "socks-user" );
- char *psz_pwd = var_InheritString( p_this, "socks-pwd" );
- if( SocksHandshakeTCP( p_this, i_handle, 5, psz_user, psz_pwd,
- psz_host, i_port ) )
- {
- msg_Err( p_this, "SOCKS handshake failed" );
- net_Close( i_handle );
- i_handle = -1;
- }
- free( psz_user );
- free( psz_pwd );
- }
- return i_handle;
- }
- int net_AcceptSingle (vlc_object_t *obj, int lfd)
- {
- int fd = vlc_accept (lfd, NULL, NULL, true);
- if (fd == -1)
- {
- if (net_errno != EAGAIN)
- #if (EAGAIN != EWOULDBLOCK)
- if (net_errno != EWOULDBLOCK)
- #endif
- msg_Err (obj, "accept failed (from socket %d): %s", lfd,
- vlc_strerror_c(net_errno));
- return -1;
- }
- msg_Dbg (obj, "accepted socket %d (from socket %d)", fd, lfd);
- setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof(int));
- return fd;
- }
- #undef net_Accept
- /**
- * Accepts an new connection on a set of listening sockets.
- * If there are no pending connections, this function will wait.
- * @note If the thread needs to handle events other than incoming connections,
- * you need to use poll() and net_AcceptSingle() instead.
- *
- * @param p_this VLC object for logging and object kill signal
- * @param pi_fd listening socket set
- * @return -1 on error (may be transient error due to network issues),
- * a new socket descriptor on success.
- */
- int net_Accept (vlc_object_t *p_this, int *pi_fd)
- {
- assert (pi_fd != NULL);
- unsigned n = 0;
- while (pi_fd[n] != -1)
- n++;
- struct pollfd ufd[n];
- /* Initialize file descriptor set */
- for (unsigned i = 0; i < n; i++)
- {
- ufd[i].fd = pi_fd[i];
- ufd[i].events = POLLIN;
- }
- for (;;)
- {
- while (poll (ufd, n, -1) == -1)
- {
- if (net_errno != EINTR)
- {
- msg_Err (p_this, "poll error: %s", vlc_strerror_c(net_errno));
- return -1;
- }
- }
- for (unsigned i = 0; i < n; i++)
- {
- if (ufd[i].revents == 0)
- continue;
- int sfd = ufd[i].fd;
- int fd = net_AcceptSingle (p_this, sfd);
- if (fd == -1)
- continue;
- /*
- * Move listening socket to the end to let the others in the
- * set a chance next time.
- */
- memmove (pi_fd + i, pi_fd + i + 1, n - (i + 1));
- pi_fd[n - 1] = sfd;
- return fd;
- }
- }
- return -1;
- }
- /*****************************************************************************
- * SocksNegotiate:
- *****************************************************************************
- * Negotiate authentication with a SOCKS server.
- *****************************************************************************/
- static int SocksNegotiate( vlc_object_t *p_obj,
- int fd, int i_socks_version,
- const char *psz_socks_user,
- const char *psz_socks_passwd )
- {
- uint8_t buffer[128+2*256];
- int i_len;
- bool b_auth = false;
- if( i_socks_version != 5 )
- return VLC_SUCCESS;
- /* We negotiate authentication */
- buffer[0] = i_socks_version; /* SOCKS version */
- if( psz_socks_user != NULL && psz_socks_passwd != NULL )
- {
- buffer[1] = 2; /* Number of methods */
- buffer[2] = 0x00; /* - No auth required */
- buffer[3] = 0x02; /* - USer/Password */
- i_len = 4;
- b_auth = true;
- }
- else
- {
- buffer[1] = 1; /* Number of methods */
- buffer[2] = 0x00; /* - No auth required */
- i_len = 3;
- }
- if( net_Write( p_obj, fd, buffer, i_len ) != i_len )
- return VLC_EGENERIC;
- if( net_Read( p_obj, fd, buffer, 2) != 2 )
- return VLC_EGENERIC;
- msg_Dbg( p_obj, "socks: v=%d method=%x", buffer[0], buffer[1] );
- if( buffer[1] == 0x00 )
- {
- msg_Dbg( p_obj, "socks: no authentication required" );
- }
- else if( buffer[1] == 0x02 )
- {
- int i_len1 = __MIN( strlen(psz_socks_user), 255 );
- int i_len2 = __MIN( strlen(psz_socks_passwd), 255 );
- msg_Dbg( p_obj, "socks: username/password authentication" );
- /* XXX: we don't support user/pwd > 255 (truncated)*/
- buffer[0] = i_socks_version; /* Version */
- buffer[1] = i_len1; /* User length */
- memcpy( &buffer[2], psz_socks_user, i_len1 );
- buffer[2+i_len1] = i_len2; /* Password length */
- memcpy( &buffer[2+i_len1+1], psz_socks_passwd, i_len2 );
- i_len = 3 + i_len1 + i_len2;
- if( net_Write( p_obj, fd, buffer, i_len ) != i_len )
- return VLC_EGENERIC;
- if( net_Read( p_obj, fd, buffer, 2 ) != 2 )
- return VLC_EGENERIC;
- msg_Dbg( p_obj, "socks: v=%d status=%x", buffer[0], buffer[1] );
- if( buffer[1] != 0x00 )
- {
- msg_Err( p_obj, "socks: authentication rejected" );
- return VLC_EGENERIC;
- }
- }
- else
- {
- if( b_auth )
- msg_Err( p_obj, "socks: unsupported authentication method %x",
- buffer[0] );
- else
- msg_Err( p_obj, "socks: authentication needed" );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * SocksHandshakeTCP:
- *****************************************************************************
- * Open a TCP connection using a SOCKS server and return a handle (RFC 1928)
- *****************************************************************************/
- static int SocksHandshakeTCP( vlc_object_t *p_obj,
- int fd,
- int i_socks_version,
- const char *psz_user, const char *psz_passwd,
- const char *psz_host, int i_port )
- {
- uint8_t buffer[128+2*256];
- if( i_socks_version != 4 && i_socks_version != 5 )
- {
- msg_Warn( p_obj, "invalid socks protocol version %d", i_socks_version );
- i_socks_version = 5;
- }
- if( i_socks_version == 5 &&
- SocksNegotiate( p_obj, fd, i_socks_version,
- psz_user, psz_passwd ) )
- return VLC_EGENERIC;
- if( i_socks_version == 4 )
- {
- /* v4 only support ipv4 */
- static const struct addrinfo hints = {
- .ai_family = AF_INET,
- .ai_socktype = SOCK_STREAM,
- .ai_protocol = IPPROTO_TCP,
- .ai_flags = AI_IDN,
- };
- struct addrinfo *res;
- if (vlc_getaddrinfo (psz_host, 0, &hints, &res))
- return VLC_EGENERIC;
- buffer[0] = i_socks_version;
- buffer[1] = 0x01; /* CONNECT */
- SetWBE( &buffer[2], i_port ); /* Port */
- memcpy (&buffer[4], /* Address */
- &((struct sockaddr_in *)(res->ai_addr))->sin_addr, 4);
- freeaddrinfo (res);
- buffer[8] = 0; /* Empty user id */
- if( net_Write( p_obj, fd, buffer, 9 ) != 9 )
- return VLC_EGENERIC;
- if( net_Read( p_obj, fd, buffer, 8 ) != 8 )
- return VLC_EGENERIC;
- msg_Dbg( p_obj, "socks: v=%d cd=%d",
- buffer[0], buffer[1] );
- if( buffer[1] != 90 )
- return VLC_EGENERIC;
- }
- else if( i_socks_version == 5 )
- {
- int i_hlen = __MIN(strlen( psz_host ), 255);
- int i_len;
- buffer[0] = i_socks_version; /* Version */
- buffer[1] = 0x01; /* Cmd: connect */
- buffer[2] = 0x00; /* Reserved */
- buffer[3] = 3; /* ATYP: for now domainname */
- buffer[4] = i_hlen;
- memcpy( &buffer[5], psz_host, i_hlen );
- SetWBE( &buffer[5+i_hlen], i_port );
- i_len = 5 + i_hlen + 2;
- if( net_Write( p_obj, fd, buffer, i_len ) != i_len )
- return VLC_EGENERIC;
- /* Read the header */
- if( net_Read( p_obj, fd, buffer, 5 ) != 5 )
- return VLC_EGENERIC;
- msg_Dbg( p_obj, "socks: v=%d rep=%d atyp=%d",
- buffer[0], buffer[1], buffer[3] );
- if( buffer[1] != 0x00 )
- {
- msg_Err( p_obj, "socks: CONNECT request failed" );
- return VLC_EGENERIC;
- }
- /* Read the remaining bytes */
- if( buffer[3] == 0x01 )
- i_len = 4-1 + 2;
- else if( buffer[3] == 0x03 )
- i_len = buffer[4] + 2;
- else if( buffer[3] == 0x04 )
- i_len = 16-1+2;
- else
- return VLC_EGENERIC;
- if( net_Read( p_obj, fd, buffer, i_len ) != i_len )
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- void net_ListenClose( int *pi_fd )
- {
- if( pi_fd != NULL )
- {
- int *pi;
- for( pi = pi_fd; *pi != -1; pi++ )
- net_Close( *pi );
- free( pi_fd );
- }
- }