/globus_gass_transfer-7.2/library/globus_gass_transfer_http.c

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/*
 * Copyright 1999-2006 University of Chicago
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef GLOBUS_DONT_DOCUMENT_INTERNAL
/**
 * @file globus_gass_transfer_http.c http/https Protocol Module Implementation
 *
 * This module implements the http and https URL schemes for the GASS transfer
 * library
 *
 * CVS Information:
 * $Source: /home/globdev/CVS/globus-packages/gass/transfer/source/library/globus_gass_transfer_http.c,v $
 * $Date: 2009/11/11 19:48:37 $
 * $Revision: 1.48 $
 * $Author: bester $
 */
#endif

#include "globus_i_gass_transfer.h"
#include "globus_io.h"
#include "globus_l_gass_transfer_http.h"

#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#ifndef TARGET_ARCH_WIN32
#include <strings.h>
#endif
#include "version.h"

#ifndef GLOBUS_DONT_DOCUMENT_INTERNAL
/*
#define DEBUG_GASS_TRANSFER
*/

typedef struct
{
    globus_gass_transfer_http_listener_proto_t *	l_proto;
    globus_gass_transfer_request_t                      request;
}
globus_l_gass_transfer_failed_kickout_closure_t;

#if defined(DEBUG_GASS_TRANSFER)
static char * globus_l_gass_transfer_http_debug_level="";
/* Debug Levels */
/* 1: Major entry points to the library are displayed */
/* 2: Calls into the gass transfer proto API are displayed */
/* 3: Callbacks are displayed */
/* 4: Callback Registration is displayed */
/* 5: Error returns from lower-level calls */
/* 6: Protocol dumps */
/* 9: Thread safety */
#define debug_printf(level,fmt) \
    if(strchr(globus_l_gass_transfer_http_debug_level, (#level)[0])) \
    {\
        printf fmt;\
    }
#undef globus_l_gass_transfer_http_lock
#undef globus_l_gass_transfer_http_unlock
static int globus_l_gass_lock_line=0;
static int globus_l_gass_lock_tmp=0;
#define MYNAME(x) static char * myname=#x
#define globus_l_gass_transfer_http_lock() \
	printf(strchr(globus_l_gass_transfer_http_debug_level,'9') ? "Thread [%d] acquiring mutex at %s:%d\n" : "", \
               (int) globus_thread_self(), \
	       __FILE__, \
	       __LINE__), \
	fflush(stdout), \
	globus_l_gass_lock_tmp = \
		globus_mutex_lock(&globus_l_gass_transfer_http_mutex), \
	globus_l_gass_lock_line=__LINE__, \
	globus_l_gass_lock_tmp
#define globus_l_gass_transfer_http_unlock() \
        printf(strchr(globus_l_gass_transfer_http_debug_level, '9') ? "Thread [%d] releasing mutex at %s:%d\n" : "", \
               (int) globus_thread_self(), \
	       __FILE__, \
	       __LINE__), \
	fflush(stdout), \
	globus_l_gass_lock_line = 0, \
	globus_mutex_unlock(&globus_l_gass_transfer_http_mutex)
#else
#define debug_printf(level, fmt)
#define MYNAME(x)
#endif

static
void
globus_l_gass_transfer_http_accept_failed_kickout(
    void *                                      arg);

static volatile int globus_l_gass_transfer_http_closing;
#if !defined(GLOBUS_GASS_TRANSFER_HTTP_PARSER_TEST)
int
globus_l_gass_transfer_http_activate(void)
{
    OM_uint32				maj_stat;
    OM_uint32				min_stat;
    gss_name_t 				name;
    gss_cred_id_t		        globus_l_gass_transfer_http_credential =
            GSS_C_NO_CREDENTIAL;
    gss_buffer_desc			name_buffer;
    MYNAME(globus_l_gass_transfer_http_activate);
    
    globus_l_gass_transfer_http_closing = 0;
    name_buffer.value = GLOBUS_NULL;
    name_buffer.length = 0;

#   if defined(DEBUG_GASS_TRANSFER)
    {
        globus_l_gass_transfer_http_debug_level =
	    globus_module_getenv("GLOBUS_GASS_TRANSFER_HTTP_DEBUG_LEVEL");

	if(globus_l_gass_transfer_http_debug_level == GLOBUS_NULL)
	{
	    globus_l_gass_transfer_http_debug_level = "";
	}
    }
#   endif
    
    debug_printf(1, (_GTSL("Entering %s()\n"),myname));
    globus_module_activate(GLOBUS_COMMON_MODULE);
    globus_module_activate(GLOBUS_GSI_GSS_ASSIST_MODULE);
    globus_module_activate(GLOBUS_IO_MODULE);

    globus_mutex_init(&globus_l_gass_transfer_http_mutex,
		      GLOBUS_NULL);
    globus_cond_init(&globus_l_gass_transfer_http_cond,
		     GLOBUS_NULL);

    maj_stat = globus_gss_assist_acquire_cred(
	&min_stat,
	GSS_C_BOTH,
	&globus_l_gass_transfer_http_credential);

    if (maj_stat != GSS_S_COMPLETE)
    {
	goto error_exit;
    }

    maj_stat = gss_inquire_cred(
	&min_stat,
	globus_l_gass_transfer_http_credential,
	&name,
	GLOBUS_NULL,
	GLOBUS_NULL,
	GLOBUS_NULL);

    if (maj_stat != GSS_S_COMPLETE)
    {
	goto error_exit;
    }

    maj_stat = gss_display_name(
	&min_stat,
	name,
	&name_buffer,
	GLOBUS_NULL);

    if (maj_stat != GSS_S_COMPLETE)
    {
	goto error_exit;
    }
    maj_stat = gss_release_name(
	&min_stat,
	&name);
    if (maj_stat != GSS_S_COMPLETE)
    {
	goto error_exit;
    }
	
    globus_l_gass_transfer_http_subject_name = name_buffer.value;

    if (globus_l_gass_transfer_http_credential != GSS_C_NO_CREDENTIAL)
    {
        gss_release_cred(&min_stat, &globus_l_gass_transfer_http_credential);
    }

    debug_printf(1, (_GTSL("Exiting %s()\n"),myname));
    
    return GLOBUS_SUCCESS;

 error_exit:
    if (globus_l_gass_transfer_http_credential != GSS_C_NO_CREDENTIAL)
    {
        gss_release_cred(&min_stat, &globus_l_gass_transfer_http_credential);
    }

    debug_printf(1, (_GTSL("Exiting %s()\n"),myname));

    return GLOBUS_FAILURE;
}

int
globus_l_gass_transfer_http_deactivate(void)
{
    MYNAME(globus_l_gass_transfer_http_deactivate);
    debug_printf(1, (_GTSL("Entering %s()\n"),myname));

    globus_l_gass_transfer_http_lock();
    while(globus_l_gass_transfer_http_closing > 0)
    {
	globus_l_gass_transfer_http_wait();
    }
    globus_l_gass_transfer_http_unlock();
    globus_module_deactivate(GLOBUS_IO_MODULE);
    globus_module_deactivate(GLOBUS_GSI_GSS_ASSIST_MODULE);

    globus_mutex_destroy(&globus_l_gass_transfer_http_mutex);
    globus_cond_destroy(&globus_l_gass_transfer_http_cond);
    globus_free(globus_l_gass_transfer_http_subject_name);

    globus_module_deactivate(GLOBUS_COMMON_MODULE);
    debug_printf(1, (_GTSL("Exiting %s()\n"),myname));
    return GLOBUS_SUCCESS;
}

globus_module_descriptor_t globus_i_gass_transfer_http_module =
{
    "globus_i_gass_transfer_http",
    globus_l_gass_transfer_http_activate,
    globus_l_gass_transfer_http_deactivate,
    GLOBUS_NULL,
    GLOBUS_NULL,
    &local_version
};

/* Protocol Descriptor, which is registered with the GASS system */
globus_gass_transfer_proto_descriptor_t
globus_i_gass_transfer_http_descriptor =
{
    "http",

    /* client-side support */
    globus_l_gass_transfer_http_new_requestattr,
    globus_l_gass_transfer_http_new_request,

    /* server-side support */
    globus_l_gass_transfer_http_new_listenerattr /* new_listenerattr */,
    globus_l_gass_transfer_http_new_listener /* new_listener */
};

globus_gass_transfer_proto_descriptor_t
globus_i_gass_transfer_https_descriptor =
{
    "https",

    /* client-side support */
    globus_l_gass_transfer_http_new_requestattr,
    globus_l_gass_transfer_http_new_request,

    /* server-side support */
    globus_l_gass_transfer_http_new_listenerattr /* new_listenerattr */,
    globus_l_gass_transfer_http_new_listener /* new_listener */
};

/*
 * Function: globus_l_gass_transfer_http_send()
 * 
 * Description: Send a byte array to an HTTP server
 * 
 * Parameters: 
 * 
 * Returns: 
 */
static
void
globus_l_gass_transfer_http_send(
    globus_gass_transfer_request_proto_t *	proto,
    globus_gass_transfer_request_t		request,
    globus_byte_t *				buffer,
    globus_size_t				buffer_length,
    globus_bool_t				last_data)
{
    globus_result_t				result;
    globus_gass_transfer_http_request_proto_t *	new_proto;
    globus_reltime_t                            delay_time;
    MYNAME(globus_l_gass_transfer_http_send);
    
    debug_printf(1, (_GTSL("Entering %s()\n"),myname));
    globus_l_gass_transfer_http_lock();
    new_proto = (globus_gass_transfer_http_request_proto_t *) proto;
    new_proto->last_data = last_data;

    /* We can only process a send if the proto is in the "idle" state */
    globus_assert(new_proto->state == GLOBUS_GASS_TRANSFER_HTTP_STATE_IDLE);

    /* state change to "pending" */
    new_proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_PENDING;

    /* Update the buffers to point to those supplied by the user */
    new_proto->user_buffer = buffer;
    new_proto->user_buflen = buffer_length;

    /* If a a failure occurred, callback with the failure bit set,
     * and close the handle
     */
    if(new_proto->failure_occurred)
    {
	goto fail_exit;
    }

    /* Register the send of the data */
    if(new_proto->chunked)
    {
	globus_size_t			num_iovecs;

	/* send chunk header and footer as an iovec array */
	sprintf((char *) new_proto->iov[0].iov_base,
		"%lx%s",
		(long) new_proto->user_buflen,
		CRLF);
	new_proto->iov[0].iov_len = strlen((char *) new_proto->iov[0].iov_base);

	new_proto->iov[1].iov_base = (void *) new_proto->user_buffer;
	new_proto->iov[1].iov_len = new_proto->user_buflen;

	new_proto->iov[2].iov_base = CRLF;
	new_proto->iov[2].iov_len = 2;

	if(last_data && new_proto->user_buflen != 0)
	{
	    /* last data, need to append a zero-length chunk to
	     * indicate this
	     */
	    num_iovecs = 4;
	}
	else if(last_data && new_proto->user_buflen == 0)
	{
	    /* last data, with a zero-length chunk from the user */
	    new_proto->iov[1].iov_base = CRLF;
	    new_proto->iov[1].iov_len = 2;
	    num_iovecs = 2;
	}
	else
	{
	    /* normal chunk */
	    num_iovecs = 3;
	}

	debug_printf(4, (_GTSL("%s(): Registering writev\n"), myname));
	result = globus_io_register_writev(
	    &new_proto->handle,
	    new_proto->iov,
	    num_iovecs /* 3 iovecs header, body, final CRLF */,
	    globus_l_gass_transfer_http_writev_callback,
	    new_proto);
    }
    else
    {
	/* send data raw */
	debug_printf(4, (_GTSL("%s(): Registering writev\n"), myname));
	result = globus_io_register_write(
	    &new_proto->handle,
	    new_proto->user_buffer,
	    new_proto->user_buflen,
	    globus_l_gass_transfer_http_write_callback,
	    new_proto);
    }

    if(result == GLOBUS_SUCCESS)
    {
	/*
	 * Registration succeeded. Callback to GASS occurs when I/O
	 * completes.
	 */
	globus_l_gass_transfer_http_unlock();

	debug_printf(1, (_GTSL("exiting %s()\n"),myname));
	return;
    }

  fail_exit:
    /* Registration failed, close up handle and signal failure to GASS */
    result = globus_l_gass_transfer_http_register_close(new_proto);

    if (result != GLOBUS_SUCCESS)
    {
        globus_l_gass_transfer_http_close(new_proto);
    }

    GlobusTimeReltimeSet(delay_time, 0, 0);

    debug_printf(4, (_GTSL("%s(): Registering oneshot\n"), myname));
    globus_callback_register_oneshot(
        GLOBUS_NULL,
	&delay_time,
	globus_l_gass_transfer_http_callback_send_callback,
	(void *) new_proto);

    globus_l_gass_transfer_http_unlock();
    debug_printf(1, (_GTSL("exiting %s()\n"),myname));
}
/* globus_l_gass_transfer_http_send() */


/*
 * Function: globus_l_gass_transfer_http_receive()
 * 
 * Description: Schedule the next block of data from the http server
 *              to end up in the provided byte array
 * 
 * Parameters: 
 * 
 * Returns: 
 */
static
void
globus_l_gass_transfer_http_receive(
    globus_gass_transfer_request_proto_t *	proto,
    globus_gass_transfer_request_t		request,
    globus_byte_t *				buffer,
    globus_size_t				buffer_length,
    globus_size_t				wait_for_length)
{
    globus_gass_transfer_http_request_proto_t *		new_proto;
    globus_reltime_t                                    delay_time;
    MYNAME(globus_l_gass_transfer_http_receive);
    
    debug_printf(1, (_GTSL("Entering %s()\n"),myname));
    
    globus_l_gass_transfer_http_lock();
    new_proto = (globus_gass_transfer_http_request_proto_t *) proto;

    /* We can only process a receive if the proto is in the "idle" state */
    globus_assert(new_proto->state == GLOBUS_GASS_TRANSFER_HTTP_STATE_IDLE);

    /* state change to "pending" */
    new_proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_PENDING;

    /* Update the buffers to point to those supplied by the user */
    new_proto->user_buffer = buffer;
    new_proto->user_buflen = buffer_length;
    new_proto->user_offset = 0;
    new_proto->user_waitlen = wait_for_length;
    new_proto->oneshot_registered = GLOBUS_TRUE;

    GlobusTimeReltimeSet(delay_time, 0, 0);
    debug_printf(4, (_GTSL("%s(): Registering oneshot\n"), myname));
    globus_callback_register_oneshot(
        GLOBUS_NULL,
	&delay_time,
	globus_l_gass_transfer_http_callback_read_buffered_callback,
	(void *) new_proto);

    globus_l_gass_transfer_http_unlock();
    debug_printf(1, (_GTSL("exiting %s()\n"),myname));
}
/* globus_l_gass_transfer_http_receive() */

/*
 * Function: globus_l_gass_transfer_http_fail()
 * 
 * Description: Cause the given request to fail for client-caused reasons
 * 
 * Parameters: 
 * 
 * Returns: 
 */
static
void
globus_l_gass_transfer_http_fail(
    globus_gass_transfer_request_proto_t *	proto,
    globus_gass_transfer_request_t		request)
{
    globus_gass_transfer_http_request_proto_t *	new_proto;
    globus_bool_t				signalled;
    globus_result_t                             result;
    MYNAME(globus_l_gass_transfer_http_fail);

    debug_printf(1, (_GTSL("entering %s()\n"),myname));

    new_proto = (globus_gass_transfer_http_request_proto_t *) proto;

    globus_l_gass_transfer_http_lock();

    signalled = GLOBUS_FALSE;
    while(!signalled)
    {
	switch(new_proto->state)
	{
	  case GLOBUS_GASS_TRANSFER_HTTP_STATE_PENDING:
	    if(new_proto->oneshot_registered == GLOBUS_TRUE)
	    {
		new_proto->failure_occurred = GLOBUS_TRUE;
		signalled = GLOBUS_TRUE;

		break;
	    }
	    else if(new_proto->oneshot_active)
	    {
		new_proto->failure_occurred = GLOBUS_TRUE;
		while(new_proto->state ==
		      GLOBUS_GASS_TRANSFER_HTTP_STATE_PENDING)
		{
		    globus_l_gass_transfer_http_wait();
		}
		break;
	    }
          case GLOBUS_GASS_TRANSFER_HTTP_STATE_CONNECTING:
          case GLOBUS_GASS_TRANSFER_HTTP_STATE_IDLE:
	    /* We will transition to the closing state, signalling the failure,
	     * and registering the close (which will transition us to the 
	     * done state).
	     */
	    signalled = GLOBUS_TRUE;
	    new_proto->failure_occurred = GLOBUS_TRUE;

	    result = globus_l_gass_transfer_http_register_close(new_proto);

            if (result != GLOBUS_SUCCESS)
            {
                globus_l_gass_transfer_http_close(new_proto);
            }
	    break;

          case GLOBUS_GASS_TRANSFER_HTTP_STATE_CLOSING:
          case GLOBUS_GASS_TRANSFER_HTTP_STATE_DONE:
          case GLOBUS_GASS_TRANSFER_HTTP_STATE_REQUESTING:
          case GLOBUS_GASS_TRANSFER_HTTP_STATE_RESPONDING:
          case GLOBUS_GASS_TRANSFER_HTTP_STATE_REFERRED:
          case GLOBUS_GASS_TRANSFER_HTTP_STATE_DENIED:
	    signalled = GLOBUS_TRUE;
	    new_proto->failure_occurred = GLOBUS_TRUE;
	    break;
        }
    }
    globus_l_gass_transfer_http_unlock();
    debug_printf(1, (_GTSL("Exiting %s()\n"),myname));
}
/* globus_l_gass_transfer_http_fail() */

static
void
globus_l_gass_transfer_http_write_callback(
    void *					callback_arg,
    globus_io_handle_t *			handle,
    globus_result_t 				result,
    globus_byte_t *				buf,
    globus_size_t				nbytes)
{
    globus_gass_transfer_http_request_proto_t *		proto;
    MYNAME(globus_l_gass_transfer_http_write_callback);

    debug_printf(3, (_GTSL("Entering %s()\n"),myname));
    proto = (globus_gass_transfer_http_request_proto_t *) callback_arg;

    globus_l_gass_transfer_http_lock();

    if(result != GLOBUS_SUCCESS ||
	    proto->failure_occurred ||
	    proto->parse_error)
    {
	proto->last_data = GLOBUS_TRUE;
    }

    if(proto->last_data)
    {
	proto->user_offset = nbytes;
	if((proto->type == GLOBUS_GASS_TRANSFER_REQUEST_TYPE_PUT ||
	   proto->type == GLOBUS_GASS_TRANSFER_REQUEST_TYPE_APPEND) &&
	   (!proto->failure_occurred && !proto->parse_error))
	{
	    if(proto->got_response)
	    {
		globus_byte_t * buffer;
		globus_size_t offset;
		globus_gass_transfer_request_t request = proto->request;

		int failed = proto->failure_occurred;

		proto->failure_occurred = GLOBUS_TRUE;
		buffer = proto->user_buffer;
		offset = proto->user_offset;

		result = globus_l_gass_transfer_http_register_close(proto);
                if (result != GLOBUS_SUCCESS)
                {
                    globus_l_gass_transfer_http_close(proto);
                }

		globus_l_gass_transfer_http_unlock();
		globus_gass_transfer_proto_send_complete(request,
							 buffer,
							 offset,
							 failed,
							 GLOBUS_TRUE);
		debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
		return;
	    }
	    else
	    {
		/* the callback to read the response is registered at
		 * the beginning of the send, so we do nothing here,
		 * and wait for the response
		 */
		proto->waiting_for_response = GLOBUS_TRUE;
		globus_l_gass_transfer_http_unlock();

		debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
		return;
	    }
	}
	else
	{
	    globus_gass_transfer_request_t request;
	    globus_byte_t * buf;
	    globus_size_t nbytes_sent;
	    globus_bool_t fail;

	    request = proto->request;
	    buf = proto->user_buffer;
	    nbytes_sent = proto->user_offset;
	    fail = proto->failure_occurred;
	    
	    
	    /* need to register the close, and callback to the user */
	    result = globus_l_gass_transfer_http_register_close(proto);
            if (result != GLOBUS_SUCCESS)
            {
                globus_l_gass_transfer_http_close(proto);
            }
	    
	    globus_l_gass_transfer_http_unlock();

	    globus_gass_transfer_proto_send_complete(
		request,
		buf,
		nbytes_sent,
		fail,
		GLOBUS_TRUE);
	    debug_printf(3, (_GTSL("Exiting %s()\n"),myname));

	    return;
	}
    }
    else
    {
	globus_gass_transfer_request_t request;
	globus_byte_t * buf;
	globus_bool_t fail;
	globus_bool_t last_data;
	    
	proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_IDLE;

	request = proto->request;
	buf = proto->user_buffer;
	fail = proto->failure_occurred;
	last_data = proto->last_data;
	

	globus_l_gass_transfer_http_unlock();
	globus_gass_transfer_proto_send_complete(request,
						 buf,
						 nbytes,
						 fail,
						 last_data);
    }
    debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
    return;
}
/* globus_l_gass_transfer_http_write_callback() */

static
void
globus_l_gass_transfer_http_writev_callback(
    void *					callback_arg,
    globus_io_handle_t *			handle,
    globus_result_t 				result,
    struct iovec *				iov,
    globus_size_t				iovcnt,
    globus_size_t				nbytes)
{
    globus_gass_transfer_http_request_proto_t *		proto;
    MYNAME(globus_l_gass_transfer_http_writev_callback);

    debug_printf(3, (_GTSL("Entering %s()\n"),myname));
    proto = (globus_gass_transfer_http_request_proto_t *) callback_arg;

    globus_l_gass_transfer_http_lock();

    if(result != GLOBUS_SUCCESS ||
	    proto->failure_occurred ||
	    proto->parse_error)
    {
	proto->last_data = GLOBUS_TRUE;
    }

    if(proto->last_data)
    {
	proto->user_offset = nbytes - iov[0].iov_len - iov[2].iov_len;

	if((proto->type == GLOBUS_GASS_TRANSFER_REQUEST_TYPE_PUT ||
	   proto->type == GLOBUS_GASS_TRANSFER_REQUEST_TYPE_APPEND) &&
	   (!proto->failure_occurred && !proto->parse_error))
	{
	    if(proto->got_response)
	    {
		globus_byte_t * buffer;
		globus_size_t offset;
		int failed = proto->failure_occurred;
		globus_gass_transfer_request_t request = proto->request;

		buffer = proto->user_buffer;
		offset = proto->user_offset;

		result = globus_l_gass_transfer_http_register_close(proto);
                if (result != GLOBUS_SUCCESS)
                {
                    globus_l_gass_transfer_http_close(proto);
                }

		globus_l_gass_transfer_http_unlock();
		globus_gass_transfer_proto_send_complete(request,
							 buffer,
							 offset,
							 failed,
							 GLOBUS_TRUE);
		debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
		return;
	    }
	    else
	    {
		/* the callback to read the response is registered at
		 * the beginning of the send, so we do nothing here,
		 * and wait for the response
		 */
		proto->waiting_for_response = GLOBUS_TRUE;
		globus_l_gass_transfer_http_unlock();

		debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
		return;
	    }
	}
	else
	{
	    globus_gass_transfer_request_t request;
	    globus_byte_t *buf;
	    globus_size_t nbytes_sent;
	    globus_bool_t fail;

	    request = proto->request;
	    buf = proto->user_buffer;
	    nbytes_sent = proto->user_offset;
	    fail = proto->failure_occurred;

	    /* need to register the close, and callback to the user */
	    result = globus_l_gass_transfer_http_register_close(proto);
            if (result != GLOBUS_SUCCESS)
            {
                globus_l_gass_transfer_http_close(proto);
            }

	    globus_l_gass_transfer_http_unlock();
	    globus_gass_transfer_proto_send_complete(
		request,
		buf,
		nbytes_sent,
		fail,
		GLOBUS_TRUE);
	    debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
	    return;
	}
    }
    else
    {
	globus_gass_transfer_request_t request;
	globus_byte_t *buf;
	globus_size_t nbytes_sent;
	globus_bool_t fail;
	
	request = proto->request;
	buf = proto->user_buffer;
	nbytes_sent = nbytes - iov[0].iov_len - iov[2].iov_len,
	fail = proto->failure_occurred;

	proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_IDLE;

	globus_l_gass_transfer_http_unlock();
	globus_gass_transfer_proto_send_complete(request,
						 buf,
						 nbytes_sent,
						 fail,
						 GLOBUS_FALSE);
	debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
	return;
    }
}
/* globus_l_gass_transfer_http_writev_callback() */

/*
 * Function: globus_l_gass_transfer_http_read_callack()
 * 
 * Description: Callback when the read of from the connection to the active
 *              buffer has completed or failed.
 * 
 * Parameters: 
 * 
 * Returns: 
 */
static
void
globus_l_gass_transfer_http_read_callback(
    void *					callback_arg,
    globus_io_handle_t *			handle,
    globus_result_t				result,
    globus_byte_t *				buf,
    globus_size_t				nbytes)
{
    globus_object_t *                           err = GLOBUS_NULL;
    globus_gass_transfer_http_request_proto_t * proto;
    globus_gass_transfer_request_t              request;
    globus_bool_t                               last_data = GLOBUS_FALSE;
    globus_bool_t                               failure = GLOBUS_FALSE;
    globus_size_t                               offset = 0;
	
    MYNAME(globus_l_gass_transfer_http_read_callback);
    
    debug_printf(3, (_GTSL("Entering %s()\n"),myname));
    
    proto = (globus_gass_transfer_http_request_proto_t *) callback_arg;

    if(result != GLOBUS_SUCCESS)
    {
        char * tmpstr;

	err = globus_error_get(result);
	tmpstr = globus_object_printable_to_string(err);
	debug_printf(5, (_GTSL("%s(): Error: %s\n"), myname, tmpstr));
	globus_libc_free(tmpstr);
    }

    globus_l_gass_transfer_http_lock();

    proto->user_offset += nbytes;
    proto->handled += nbytes;
    if(nbytes > proto->user_waitlen)
    {
	proto->user_waitlen = 0;
    }
    else
    {
	proto->user_waitlen -= nbytes;
    }

    if(proto->chunked)
    {
	proto->chunk_left -= nbytes;
    }

    if(result != GLOBUS_SUCCESS &&
       globus_io_eof(err))
    {
	proto->eof_read = GLOBUS_TRUE;
    }
    else if(result != GLOBUS_SUCCESS ||
	    proto->failure_occurred ||
	    proto->parse_error)
    {
	proto->recv_state = GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR;
    }

    if(proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_UNTIL_EOF &&
       proto->eof_read == GLOBUS_TRUE)
    {
	proto->recv_state = GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF;
    }
    else if(proto->recv_state ==
	        GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_UNTIL_LENGTH &&
	    proto->handled == proto->length)
    {
	proto->recv_state = GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF;
    }
    else if(proto->recv_state ==
	        GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_UNTIL_LENGTH &&
	    proto->eof_read == GLOBUS_TRUE &&
	    proto->handled < proto->length)
    {
	proto->recv_state = GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR;
    }
    else if(nbytes==0 && proto->eof_read)
    {
        proto->failure_occurred = GLOBUS_TRUE;
	proto->recv_state = GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR;
    }

    if((proto->type == GLOBUS_GASS_TRANSFER_REQUEST_TYPE_PUT ||
       proto->type == GLOBUS_GASS_TRANSFER_REQUEST_TYPE_APPEND) &&
       proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF)
    {
	char  *					response;
	globus_size_t				response_len=0;
	globus_size_t				offset;


	response_len += 1;
	response_len += strlen(GLOBUS_L_GENERIC_RESPONSE);
	response_len += 3;
	response_len += strlen(GLOBUS_L_OK);
	response_len += 2;
	response = globus_malloc(response_len);

	proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_RESPONDING;
	offset = sprintf(response,
		GLOBUS_L_GENERIC_RESPONSE,
		0,
		200,
		GLOBUS_L_OK);
	offset += sprintf(response + offset,
			  CRLF);

	debug_printf(4,(_GTSL("%s(): Registering write\n"),myname));
	globus_io_register_write(&proto->handle,
				 (globus_byte_t *) response,
				 strlen(response),
				 globus_l_gass_transfer_http_write_response,
				 proto);
    }
    /* Register the socket for closing if we're done reading from it */
    else if(proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF ||
       proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR)
    {
	failure = proto->failure_occurred;
	buf = proto->user_buffer;
	offset = proto->user_offset;
	request = proto->request;
        last_data = GLOBUS_TRUE;

	if(proto->state != GLOBUS_GASS_TRANSFER_HTTP_STATE_CLOSING)
	{
	    result = globus_l_gass_transfer_http_register_close(proto);
            if (result != GLOBUS_SUCCESS)
            {
                globus_l_gass_transfer_http_close(proto);
            }
	}
	globus_l_gass_transfer_http_unlock();
	debug_printf(2, (_GTSL("calling globus_gass_transfer_proto_receive_complete()")));
	globus_gass_transfer_proto_receive_complete(request,
						    buf,
						    offset,
						    failure,
						    last_data);
        goto out;
    }

    if(proto->user_waitlen == 0 ||
       proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF ||
       proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR)
    {
	/*
	 * Received the required minimum of data from connection, an
	 * error, or the end-of file, signal this to GASS
	 */
	if(proto->state == GLOBUS_GASS_TRANSFER_HTTP_STATE_PENDING)
	{
	    proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_IDLE;
	}
	if(proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF ||
	   proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR)
	{
	    last_data = GLOBUS_TRUE;
	}

	failure = proto->failure_occurred;
	buf = proto->user_buffer;
	offset = proto->user_offset;
	request = proto->request;

	globus_l_gass_transfer_http_unlock();
	debug_printf(2, (_GTSL("calling globus_gass_transfer_proto_receive_complete()")));
	globus_gass_transfer_proto_receive_complete(request,
						    buf,
						    offset,
						    failure,
						    last_data);
    }
    else
    {
	result = globus_l_gass_transfer_http_register_read(proto);

	globus_l_gass_transfer_http_unlock();
    }

out:
    if(err)
    {
	globus_object_free(err);
    }

    debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
    return;
}
/* globus_l_gass_transfer_http_read_callback() */

/*
 * Function: globus_l_gass_transfer_http_read_buffered_callack()
 * 
 * Description: Callback when the read of from the http to the
 *              response buffer has completed or failed.
 * 
 * Parameters: 
 * 
 * Returns: 
 */
static
void
globus_l_gass_transfer_http_read_buffered_callback(
    void *					callback_arg,
    globus_io_handle_t *			handle,
    globus_result_t				result,
    globus_byte_t *				buf,
    globus_size_t				nbytes)
{
    globus_object_t *				err = GLOBUS_NULL;
    globus_gass_transfer_http_request_proto_t *		proto;
    MYNAME(globus_l_gass_transfer_http_read_buffered_callback);

    debug_printf(3, (_GTSL("Entering %s()\n"),myname));

    proto = (globus_gass_transfer_http_request_proto_t *) callback_arg;

    if(result != GLOBUS_SUCCESS)
    {
        char * tmpstr;

	err = globus_error_get(result);
	tmpstr = globus_object_printable_to_string(err);
	debug_printf(5, (_GTSL("%s(): %s\n"), myname, tmpstr));
	globus_libc_free(tmpstr);
    }

    globus_l_gass_transfer_http_lock();

    proto->response_offset += nbytes;

    if(result != GLOBUS_SUCCESS &&
       globus_io_eof(err))
    {
	proto->eof_read = GLOBUS_TRUE;
    }
    else if(result != GLOBUS_SUCCESS)
    {
	proto->recv_state = GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR;
    }

    /*
     * Copy the document from the response buffer to the user-supplied
     * buffer, translating end-of-line if necessary, and handling any
     * chunk header/footer information
     */
    globus_l_gass_transfer_http_handle_chunk(proto);

    if(proto->failure_occurred)
    {
	proto->recv_state = GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR;
    }

    /* successful read for server, send response */
    if((proto->type == GLOBUS_GASS_TRANSFER_REQUEST_TYPE_PUT ||
	proto->type == GLOBUS_GASS_TRANSFER_REQUEST_TYPE_APPEND) &&
       proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF &&
       proto->recv_state != GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR)
    {
	char  *					response;
	globus_size_t				response_len=0;
	globus_size_t				offset;


	response_len += 1;
	response_len += strlen(GLOBUS_L_GENERIC_RESPONSE);
	response_len += 3;
	response_len += strlen(GLOBUS_L_OK);
	response_len += 2;
	response = globus_malloc(response_len);

	proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_RESPONDING;
	offset = sprintf(response,
		GLOBUS_L_GENERIC_RESPONSE,
		0,
		200,
		GLOBUS_L_OK);
	offset += sprintf(response + offset,
			  CRLF);

	debug_printf(4,(_GTSL("%s(): Registering write\n"),myname));
	globus_io_register_write(&proto->handle,
				 (globus_byte_t *) response,
				 strlen(response),
				 globus_l_gass_transfer_http_write_response,
				 proto);
    }
    /* Register the socket for closing if we're done reading from it */
    else if(proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF ||
	    proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR)
    {
	if(proto->state != GLOBUS_GASS_TRANSFER_HTTP_STATE_CLOSING)
	{
	    result = globus_l_gass_transfer_http_register_close(proto);
            if (result != GLOBUS_SUCCESS)
            {
                globus_l_gass_transfer_http_close(proto);
            }
	}
    }
    if(proto->user_waitlen == 0 ||
       proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF ||
       proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR)
    {
	globus_gass_transfer_request_t		request;
	globus_bool_t				last_data = GLOBUS_FALSE;
	globus_bool_t				failure ;
	globus_byte_t *				buf;
	globus_size_t				offset;
	/*
	 * Received the required minimum of data from connection, an
	 * error, or the end-of file, signal this to GASS
	 */
	if(proto->state == GLOBUS_GASS_TRANSFER_HTTP_STATE_PENDING)
	{
	    proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_IDLE;
	}
	if(proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_EOF ||
	   proto->recv_state == GLOBUS_GASS_TRANSFER_HTTP_RECV_STATE_ERROR)
	{
	    last_data = GLOBUS_TRUE;
	}

	if(err)
	{
	    globus_object_free(err);
	    err = GLOBUS_NULL;
	}

	proto->oneshot_active = GLOBUS_FALSE;
	failure = proto->failure_occurred;
	buf = proto->user_buffer;
	offset = proto->user_offset;
	request = proto->request;

	globus_l_gass_transfer_http_signal();
	globus_l_gass_transfer_http_unlock();

	debug_printf(2, (_GTSL("calling globus_gass_transfer_proto_receive_complete()\n")));
	globus_gass_transfer_proto_receive_complete(request,
						    buf,
						    offset,
						    failure,
						    last_data);
        debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
	return;
    }
    else
    {
	result = globus_l_gass_transfer_http_register_read(proto);
    }

    if(result != GLOBUS_SUCCESS)
    {
        goto error_exit;
    }

    proto->oneshot_active = GLOBUS_FALSE;

    globus_l_gass_transfer_http_unlock();
    if(err)
    {
	globus_object_free(err);
    }
    debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
    return;

  error_exit:
    proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_CLOSING;
    proto->failure_occurred = GLOBUS_TRUE;
    proto->oneshot_active = GLOBUS_FALSE;
    proto->oneshot_active = GLOBUS_FALSE;

		    
    result = globus_l_gass_transfer_http_register_close(proto);

    if(err)
    {
	globus_object_free(err);
    }

    {
	globus_gass_transfer_request_t request;
	globus_byte_t *buf;
	globus_size_t offset;

	request = proto->request;
	buf = proto->user_buffer;
	offset = proto->user_offset;

        /* register close failed, act as though it was closed */
        if (result != GLOBUS_SUCCESS)
        {
            globus_l_gass_transfer_http_close(proto);
        }
	globus_l_gass_transfer_http_unlock();
	debug_printf(2, (_GTSL("calling globus_gass_transfer_proto_receive_complete()")));
	globus_gass_transfer_proto_receive_complete(request,
						    buf,
						    offset,
						    GLOBUS_TRUE,
						    GLOBUS_TRUE);
    }
    debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
    return;
}
/* globus_l_gass_transfer_http_read_buffered_callback() */

/*
 * Function: globus_l_gass_transfer_http_close_callback()
 *
 * Description: Called upon completion of close()ing the file handle,
 *              Will free the proto instance if the client has called
 *              the "done" function
 *
 *
 * Parameters:
 *
 * Returns:
 */
static
void
globus_l_gass_transfer_http_close_callback(
    void *					callback_arg,
    globus_io_handle_t *			handle,
    globus_result_t				result)
{
    globus_gass_transfer_http_request_proto_t *		proto;
    MYNAME(globus_l_gass_transfer_http_close_callback);

    debug_printf(3, (_GTSL("Entering %s()\n"),myname));
    proto = (globus_gass_transfer_http_request_proto_t *) callback_arg;

    globus_l_gass_transfer_http_lock();
    globus_l_gass_transfer_http_close(proto);
    globus_l_gass_transfer_http_unlock();
}
/* globus_l_gass_transfer_http_close_callback() */

/*
 * Function: globus_l_gass_transfer_http_close()
 *
 * Description: must be called with the mutex locked
 *
 *
 * Parameters:
 *
 * Returns:
 */
static
void
globus_l_gass_transfer_http_close(
    globus_gass_transfer_http_request_proto_t *		proto)
{
    proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_DONE;

    if(proto->destroy_called)
    {
	globus_l_gass_transfer_http_proto_destroy(proto);
    }
    globus_l_gass_transfer_http_closing--;

    globus_l_gass_transfer_http_signal();
}
/* globus_l_gass_transfer_http_close() */

/*
 * Function: globus_l_gass_transfer_http_register_close()
 *
 * Description: must be called with the mutex locked
 *
 *
 * Parameters:
 *
 * Returns:
 */
static
globus_result_t
globus_l_gass_transfer_http_register_close(
    globus_gass_transfer_http_request_proto_t *		proto)
{
    globus_result_t result;
    MYNAME(globus_l_gass_transfer_http_register_close);
    
    proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_CLOSING;

    globus_l_gass_transfer_http_closing++;
    
    debug_printf(4,(_GTSL("%s(): registering close on %p\n"), myname, &proto->handle));
    result = globus_io_register_close(
	&proto->handle,
	globus_l_gass_transfer_http_close_callback,
	proto);

    return result;
}
/* globus_l_gass_transfer_http_register_close() */

/*
 * Function: globus_l_gass_transfer_http_listener_close_callback()
 *
 * Description:
 *
 * Parameters:
 *
 * Returns:
 */
static
void
globus_l_gass_transfer_http_listener_close_callback(
    void *				callback_arg,
    globus_io_handle_t *		handle,
    globus_result_t			result)
{
    globus_gass_transfer_http_listener_proto_t *
					proto;
    MYNAME(globus_l_gass_transfer_http_listener_close_callback);

    debug_printf(3, (_GTSL("Entering %s()\n"),myname));
    proto = (globus_gass_transfer_http_listener_proto_t *) callback_arg;

    globus_l_gass_transfer_http_lock();
    globus_l_gass_transfer_http_listener_close(proto);
    globus_l_gass_transfer_http_unlock();
    debug_printf(3, (_GTSL("Exiting %s()\n"),myname));    
}
/* globus_l_gass_transfer_http_listener_close_callback() */

/*
 * Function: globus_l_gass_transfer_http_listener_close()
 *
 * Description: must be called with the mutex locked
 *
 * Parameters:
 *
 * Returns:
 */
static
void
globus_l_gass_transfer_http_listener_close(
    globus_gass_transfer_http_listener_proto_t * proto)
{
    proto->state = GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSED;

    if(proto->destroy_called)
    {
	globus_l_gass_transfer_http_listener_proto_destroy(proto);
    }
    globus_l_gass_transfer_http_closing--;

    globus_l_gass_transfer_http_signal();
}
/* globus_l_gass_transfer_http_listener_close() */

static
void
globus_l_gass_transfer_http_register_listener_close(
    globus_gass_transfer_http_listener_proto_t * proto)
{
    globus_result_t result;
    MYNAME(globus_l_gass_transfer_http_register_listener_close);
    globus_l_gass_transfer_http_closing++;

    debug_printf(4,(_GTSL("%s(): registering close on %p\n"), myname, &proto->handle));
    result = globus_io_register_close(
	&proto->handle,
	globus_l_gass_transfer_http_listener_close_callback,
	proto);

    globus_assert(result == GLOBUS_SUCCESS);

    if(result != GLOBUS_SUCCESS)
    {
	globus_l_gass_transfer_http_listener_close(proto);
    }
}
/* globus_l_gass_transfer_http_register_listener_close() */
  
/*
 * Function: globus_l_gass_transfer_http_listener_proto_destroy()
 *
 * Description:
 *
 * Parameters:
 *
 * Returns:
 */
static
void
globus_l_gass_transfer_http_listener_proto_destroy(
    globus_gass_transfer_http_listener_proto_t *
					proto)
{
    globus_free(proto);
}
/* globus_l_gass_transfer_http_listener_proto_destroy() */

/*
 * Function: globus_l_gass_transfer_http_destroy()
 *
 * Description:
 *
 * Parameters:
 *
 * Returns:
 */
static
void
globus_l_gass_transfer_http_destroy(
    globus_gass_transfer_request_proto_t *	proto,
    globus_gass_transfer_request_t		request)
{
    globus_gass_transfer_http_request_proto_t *		new_proto;
    MYNAME(globus_l_gass_transfer_http_destroy);

    debug_printf(1, (_GTSL("entering %s()\n"),myname));
    new_proto = (globus_gass_transfer_http_request_proto_t *) proto;

    globus_l_gass_transfer_http_lock();
    if(new_proto->state == GLOBUS_GASS_TRANSFER_HTTP_STATE_CLOSING ||
       new_proto->state == GLOBUS_GASS_TRANSFER_HTTP_STATE_REFERRED ||
       new_proto->state == GLOBUS_GASS_TRANSFER_HTTP_STATE_RESPONDING ||
       new_proto->state == GLOBUS_GASS_TRANSFER_HTTP_STATE_DENIED)
    {
	new_proto->destroy_called=GLOBUS_TRUE;
    }
    else if(new_proto->state == GLOBUS_GASS_TRANSFER_HTTP_STATE_DONE)
    {
	globus_l_gass_transfer_http_proto_destroy(new_proto);
    }
    globus_l_gass_transfer_http_unlock();
    debug_printf(1, (_GTSL("exiting %s()\n"),myname));
}
/* globus_l_gass_transfer_http_destroy() */

/*
 * Function: globus_l_gass_transfer_http_listener_destroy()
 *
 * Description:
 *
 * Parameters:
 *
 * Returns:
 */
static
void
globus_l_gass_transfer_http_listener_destroy(
    globus_gass_transfer_listener_proto_t *	proto,
    globus_gass_transfer_listener_t		listener)
{
    globus_gass_transfer_http_listener_proto_t *new_proto;
    MYNAME(globus_l_gass_transfer_http_listener_destroy);

    debug_printf(1, (_GTSL("entering %s()\n"),myname));
    new_proto = (globus_gass_transfer_http_listener_proto_t *) proto;

    globus_l_gass_transfer_http_lock();
    if(new_proto->state != GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSED)
    {
	new_proto->destroy_called=GLOBUS_TRUE;
    }
    else
    {
	globus_l_gass_transfer_http_listener_proto_destroy(new_proto);
    }
    globus_l_gass_transfer_http_unlock();
    debug_printf(1, (_GTSL("exiting %s()\n"),myname));
}
/* globus_l_gass_transfer_http_listener_destroy() */

/*
 * Function: globus_l_gass_transfer_http_listen()
 *
 * Description:
 *
 * Parameters:
 *
 * Returns:
 */
static
void
globus_l_gass_transfer_http_listen(
    globus_gass_transfer_listener_proto_t *	proto,
    globus_gass_transfer_listener_t		listener)
{
    globus_gass_transfer_http_listener_proto_t *new_proto;
    globus_result_t				result;
    globus_reltime_t                            delay_time;
    MYNAME(globus_l_gass_transfer_http_listen);

    debug_printf(1, (_GTSL("entering %s()\n"),myname));
    new_proto = (globus_gass_transfer_http_listener_proto_t *) proto;

    globus_l_gass_transfer_http_lock();

    debug_printf(4,(_GTSL("%s(): registering listen on %p\n"),
		    myname,
		    &new_proto->handle));
    result = globus_io_tcp_register_listen(
	&new_proto->handle,
	globus_l_gass_transfer_http_listen_callback,
	(void *) new_proto);

    if(result != GLOBUS_SUCCESS)
    {
        GlobusTimeReltimeSet(delay_time, 0, 0);
	debug_printf(4,(_GTSL("%s(): registering oneshot because listen failed\n"),
		    myname));
	globus_callback_register_oneshot(
	    GLOBUS_NULL,
	    &delay_time,
	    globus_l_gass_transfer_http_callback_listen_callback,
	    (void *) new_proto);
	
    }
    else
    {
	new_proto->state = GLOBUS_GASS_TRANSFER_HTTP_LISTENER_LISTENING;
    }
    globus_l_gass_transfer_http_unlock();
    debug_printf(1, (_GTSL("exiting %s()\n"),myname));
}
/* globus_l_gass_transfer_http_listen() */

static
void
globus_l_gass_transfer_http_listen_callback(
    void *					callback_arg,
    globus_io_handle_t *			handle,
    globus_result_t				result)
{
    globus_gass_transfer_http_listener_proto_t *proto;
    globus_gass_transfer_listener_t		listener;
    MYNAME(globus_l_gass_transfer_http_listen_callback);
    
    debug_printf(3, (_GTSL("Entering %s()\n"),myname));    

    proto = (globus_gass_transfer_http_listener_proto_t *) callback_arg;
    globus_l_gass_transfer_http_lock();

    switch(proto->state)
    {
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_LISTENING:
	proto->state = GLOBUS_GASS_TRANSFER_HTTP_LISTENER_READY;
	break;
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSING1:
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSED:
	break;
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_STARTING:
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_ACCEPTING:
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_READY:
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSING2:
	globus_assert(proto->state != GLOBUS_GASS_TRANSFER_HTTP_LISTENER_STARTING);
	globus_assert(proto->state != GLOBUS_GASS_TRANSFER_HTTP_LISTENER_ACCEPTING);
	globus_assert(proto->state != GLOBUS_GASS_TRANSFER_HTTP_LISTENER_READY);
	globus_assert(proto->state != GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSING2);
    }

    listener = proto->listener;
    globus_l_gass_transfer_http_unlock();

    debug_printf(2, (_GTSL("calling globus_gass_transfer_proto_listener_ready()")));
    globus_gass_transfer_proto_listener_ready(listener);
    debug_printf(3, (_GTSL("Exiting %s()\n"),myname));
}
/* globus_l_gass_transfer_http_listen_callback() */

static
void
globus_l_gass_transfer_http_accept_callback(
    void *					callback_arg,
    globus_io_handle_t *			handle,
    globus_result_t				result)
{
    globus_gass_transfer_http_listener_proto_t *l;
    MYNAME(globus_l_gass_transfer_http_accept_callback);
    
    debug_printf(3, (_GTSL("Entering %s()\n"),myname));
    globus_l_gass_transfer_http_lock();

    fflush(stdout);

    l = (globus_gass_transfer_http_listener_proto_t *) callback_arg;

    switch(l->state)
    {
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_ACCEPTING:
	l->request->response_buffer = globus_malloc(GLOBUS_L_GASS_RESPONSE_LEN *
							sizeof(globus_byte_t));
	l->request->response_buflen = GLOBUS_L_GASS_RESPONSE_LEN;
	l->request->response_offset = 0;
	l->request->parsed_offset = 0;

	if(result != GLOBUS_SUCCESS)
	{
	    globus_l_gass_transfer_http_unlock();
	    globus_l_gass_transfer_http_request_callback(
		l,
		&l->request->handle,
		result,
		l->request->response_buffer,
		0);
            debug_printf(3, (_GTSL("Exiting globus_l_gass_transfer_http_accept_callback()\n")));        
	    return;
	}
	else
	{
            debug_printf(4, (_GTSL("%s(): Registering read on %p\n"),
			     myname,
			     &l->request->handle));        
	    globus_io_register_read(&l->request->handle,
				    l->request->response_buffer,
				    l->request->response_buflen,
				    1,
				    globus_l_gass_transfer_http_request_callback,
				    l);
	}
	break;

      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSING2:
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSED:
	globus_l_gass_transfer_http_unlock();
	globus_gass_transfer_proto_new_listener_request(l->listener,
							l->request->request,
							GLOBUS_NULL);
	globus_l_gass_transfer_http_lock();
	/* should destroy the proto->request here? */
	break;
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_STARTING:
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_LISTENING:
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_READY:
      case GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSING1:
	globus_assert(l->state != GLOBUS_GASS_TRANSFER_HTTP_LISTENER_STARTING);
	globus_assert(l->state != GLOBUS_GASS_TRANSFER_HTTP_LISTENER_LISTENING);
	globus_assert(l->state != GLOBUS_GASS_TRANSFER_HTTP_LISTENER_READY);
	globus_assert(l->state != GLOBUS_GASS_TRANSFER_HTTP_LISTENER_CLOSING1);
    }
    globus_l_gass_transfer_http_unlock();
    debug_printf(3, (_GTSL("Exiting %s()\n"), myname));        
}
/* globus_l_gass_transfer_http_accept_callback() */

static
void
globus_l_gass_transfer_http_request_refer(
    globus_gass_transfer_request_proto_t *	rproto,
    globus_gass_transfer_request_t		request)
{
    globus_gass_transfer_http_request_proto_t *	proto;
    globus_gass_transfer_referral_t 		referral;
    int						rc;
    char *					referral_string;
    globus_size_t				referral_count;
    globus_size_t				body_count=0; /* :) */
    globus_size_t				offset;
    globus_size_t				x;
    globus_size_t				i;
    globus_size_t				digits = 0;
    MYNAME(globus_l_gass_transfer_http_request_refer);
    
    globus_l_gass_transfer_http_lock();
    proto = (globus_gass_transfer_http_request_proto_t *) rproto;

    rc = globus_gass_transfer_request_get_referral(request,
						   &referral);

    /* HTTP/1.1 302 Document Moved CRLF
     * Location: referral.url[0] CRLF
     * Content-Length: $body_count CRLF
     * Content-Type: text/html CRLF
     * CRLF
     * <html><head><title>300 Multiple Choices</title></head><body>
     * <a href="<referral.url[1]>">referral.url[1]</a><br>
     * ..
     * <a href="<referral.url[i]>">referral.url[i]</a><br>
     * </body></html>
     */
    referral_count = 1;
    referral_count += strlen(GLOBUS_L_REFER_RESPONSE);
    referral_count += strlen(GLOBUS_L_LOCATION_HEADER);
    referral_count += 2;
    referral_count += strlen(GLOBUS_L_CONTENT_LENGTH_HEADER);

    referral_count += strlen(GLOBUS_L_HTML_HEADER);

    referral_count += strlen(referral.url[0]);

    body_count += strlen(GLOBUS_L_HTML_REFERRAL_BODY_HEAD);
    body_count += strlen(GLOBUS_L_HTML_REFERRAL_BODY_TAIL);
    for(i = 0 ; i < referral.count; i++)
    {
	body_count += strlen(GLOBUS_L_HTML_HREF);
	body_count += strlen(referral.url[i]);
	body_count += strlen(referral.url[i]);
    }

    /* count the number of decimal digits in the body */
    x=body_count;
    do
    {
	digits++;
	x /= 10;
    } while(x > 0);

    referral_count += digits;

    referral_string = globus_malloc(referral_count + body_count);

    offset = sprintf(referral_string,
		     GLOBUS_L_REFER_RESPONSE);
    offset += sprintf(referral_string + offset,
		      GLOBUS_L_LOCATION_HEADER,
		      referral.url[0]);

    offset += sprintf(referral_string + offset,
		      GLOBUS_L_HTML_HEADER);
    offset += sprintf(referral_string + offset,
		      GLOBUS_L_CONTENT_LENGTH_HEADER,
		      (long) body_count);
    offset += sprintf(referral_string + offset,
		      CRLF);

    offset += sprintf(referral_string + offset,
		      GLOBUS_L_HTML_REFERRAL_BODY_HEAD);
    for(i = 0 ; i < referral.count; i++)
    {
	offset += sprintf(referral_string + offset,
			  GLOBUS_L_HTML_HREF,
			  referral.url[i],
			  referral.url[i]);
    }
    offset += sprintf(referral_string + offset,
		      GLOBUS_L_HTML_REFERRAL_BODY_TAIL);

    proto->state = GLOBUS_GASS_TRANSFER_HTTP_STATE_REFERRED;

    globus_gass_transfer_referral_destroy(&referral);

    debug_printf(4, (_GTSL("%s(): Registering write on %p\n"),
		     myname,
		     &proto->handle));        
    globus_io_register_write(&proto->handle,
			     (globus_byte_t *) referral_string,
			     strlen(referral_string),
			     globus_l_gass_transfer_http_write_response,
			     proto);

    globus_l_gass_transfer_http_unlock();
}
/* globus_l_gass_transfer_http_request_refer() */

static
void
globus_l_gass_transfer_http_request_deny(
    globus_gass_transfer_request_proto_t *	rproto,
    globus_gass_transfer_request_t		request)
{
    globus_gass_transfer_http_request_proto_t *	proto;
    char *					deny_string;
    globus_size_t				deny_count;
    globus_size_t				body_count=0; /* :) */
    globus_size_t				offset;
    globus_size_t				x;
    globus_size_t				digits = 0;
    int						reason;
    char *					message;
    MYNAME(globus_l_gass_transfer_http_request_deny);
    
    globus_l_gass_transfer_http_lock();
    proto = (globus_gass_transfer_http_request_proto_t *) rproto;

    reason = globus_gass_transfer_request_get_denial_reason(request);

    if(reason < 400 ||
       reason >= 600)
    {
	reason = 500;
	message = globus_libc_strdup(GLOBUS_L_…