http.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/

#include "setup.h"

#ifndef CURL_DISABLE_HTTP

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "formdata.h"
#include "progress.h"
#include "curl_base64.h"
#include "cookie.h"
#include "strequal.h"
#include "sslgen.h"
#include "http_digest.h"
#include "curl_ntlm.h"
#include "curl_ntlm_wb.h"
#include "http_negotiate.h"
#include "url.h"
#include "share.h"
#include "hostip.h"
#include "http.h"
#include "curl_memory.h"
#include "select.h"
#include "parsedate.h" /* for the week day and month names */
#include "strtoofft.h"
#include "multiif.h"
#include "rawstr.h"
#include "content_encoding.h"
#include "http_proxy.h"
#include "warnless.h"
#include "non-ascii.h"

#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>

/* The last #include file should be: */
#include "memdebug.h"

/*
 * Forward declarations.
 */

static int http_getsock_do(struct connectdata *conn,
                           curl_socket_t *socks,
                           int numsocks);
static int http_should_fail(struct connectdata *conn);

#ifdef USE_SSL
static CURLcode https_connecting(struct connectdata *conn, bool *done);
static int https_getsock(struct connectdata *conn,
                         curl_socket_t *socks,
                         int numsocks);
#else
#define https_connecting(x,y) CURLE_COULDNT_CONNECT
#endif

/*
 * HTTP handler interface.
 */
const struct Curl_handler Curl_handler_http = {
  "HTTP",                               /* scheme */
  ZERO_NULL,                            /* setup_connection */
  Curl_http,                            /* do_it */
  Curl_http_done,                       /* done */
  ZERO_NULL,                            /* do_more */
  Curl_http_connect,                    /* connect_it */
  ZERO_NULL,                            /* connecting */
  ZERO_NULL,                            /* doing */
  ZERO_NULL,                            /* proto_getsock */
  http_getsock_do,                      /* doing_getsock */
  ZERO_NULL,                            /* domore_getsock */
  ZERO_NULL,                            /* perform_getsock */
  ZERO_NULL,                            /* disconnect */
  ZERO_NULL,                            /* readwrite */
  PORT_HTTP,                            /* defport */
  CURLPROTO_HTTP,                       /* protocol */
  PROTOPT_NONE                          /* flags */
};

#ifdef USE_SSL
/*
 * HTTPS handler interface.
 */
const struct Curl_handler Curl_handler_https = {
  "HTTPS",                              /* scheme */
  ZERO_NULL,                            /* setup_connection */
  Curl_http,                            /* do_it */
  Curl_http_done,                       /* done */
  ZERO_NULL,                            /* do_more */
  Curl_http_connect,                    /* connect_it */
  https_connecting,                     /* connecting */
  ZERO_NULL,                            /* doing */
  https_getsock,                        /* proto_getsock */
  http_getsock_do,                      /* doing_getsock */
  ZERO_NULL,                            /* domore_getsock */
  ZERO_NULL,                            /* perform_getsock */
  ZERO_NULL,                            /* disconnect */
  ZERO_NULL,                            /* readwrite */
  PORT_HTTPS,                           /* defport */
  CURLPROTO_HTTP | CURLPROTO_HTTPS,     /* protocol */
  PROTOPT_SSL                           /* flags */
};
#endif


/*
 * checkheaders() checks the linked list of custom HTTP headers for a
 * particular header (prefix).
 *
 * Returns a pointer to the first matching header or NULL if none matched.
 */
char *Curl_checkheaders(struct SessionHandle *data, const char *thisheader)
{
  struct curl_slist *head;
  size_t thislen = strlen(thisheader);

  for(head = data->set.headers; head; head=head->next) {
    if(Curl_raw_nequal(head->data, thisheader, thislen))
      return head->data;
  }
  return NULL;
}

/*
 * Strip off leading and trailing whitespace from the value in the
 * given HTTP header line and return a strdupped copy. Returns NULL in
 * case of allocation failure. Returns an empty string if the header value
 * consists entirely of whitespace.
 */
static char *copy_header_value(const char *h)
{
  const char *start;
  const char *end;
  char *value;
  size_t len;

  DEBUGASSERT(h);

  /* Find the end of the header name */
  while(*h && (*h != ':'))
    ++h;

  if(*h)
    /* Skip over colon */
    ++h;

  /* Find the first non-space letter */
  start = h;
  while(*start && ISSPACE(*start))
    start++;