1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22/* An example of curl_easy_send() and curl_easy_recv() usage. */
23
24#include <stdio.h>
25#include <string.h>
26#include <curl/curl.h>
27
28/* Auxiliary function that waits on the socket. */
29static int wait_on_socket(curl_socket_t sockfd, int for_recv, long timeout_ms)
30{
31  struct timeval tv;
32  fd_set infd, outfd, errfd;
33  int res;
34
35  tv.tv_sec = timeout_ms / 1000;
36  tv.tv_usec= (timeout_ms % 1000) * 1000;
37
38  FD_ZERO(&infd);
39  FD_ZERO(&outfd);
40  FD_ZERO(&errfd);
41
42  FD_SET(sockfd, &errfd); /* always check for error */
43
44  if(for_recv)
45  {
46    FD_SET(sockfd, &infd);
47  }
48  else
49  {
50    FD_SET(sockfd, &outfd);
51  }
52
53  /* select() returns the number of signalled sockets or -1 */
54  res = select(sockfd + 1, &infd, &outfd, &errfd, &tv);
55  return res;
56}
57
58int main(void)
59{
60  CURL *curl;
61  CURLcode res;
62  /* Minimalistic http request */
63  const char *request = "GET / HTTP/1.0\r\nHost: example.com\r\n\r\n";
64  curl_socket_t sockfd; /* socket */
65  long sockextr;
66  size_t iolen;
67  curl_off_t nread;
68
69  curl = curl_easy_init();
70  if(curl) {
71    curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
72    /* Do not do the transfer - only connect to host */
73    curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
74    res = curl_easy_perform(curl);
75
76    if(CURLE_OK != res)
77    {
78      printf("Error: %s\n", strerror(res));
79      return 1;
80    }
81
82    /* Extract the socket from the curl handle - we'll need it for waiting.
83     * Note that this API takes a pointer to a 'long' while we use
84     * curl_socket_t for sockets otherwise.
85     */
86    res = curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, &sockextr);
87
88    if(CURLE_OK != res)
89    {
90      printf("Error: %s\n", curl_easy_strerror(res));
91      return 1;
92    }
93
94    sockfd = sockextr;
95
96    /* wait for the socket to become ready for sending */
97    if(!wait_on_socket(sockfd, 0, 60000L))
98    {
99      printf("Error: timeout.\n");
100      return 1;
101    }
102
103    puts("Sending request.");
104    /* Send the request. Real applications should check the iolen
105     * to see if all the request has been sent */
106    res = curl_easy_send(curl, request, strlen(request), &iolen);
107
108    if(CURLE_OK != res)
109    {
110      printf("Error: %s\n", curl_easy_strerror(res));
111      return 1;
112    }
113    puts("Reading response.");
114
115    /* read the response */
116    for(;;)
117    {
118      char buf[1024];
119
120      wait_on_socket(sockfd, 1, 60000L);
121      res = curl_easy_recv(curl, buf, 1024, &iolen);
122
123      if(CURLE_OK != res)
124        break;
125
126      nread = (curl_off_t)iolen;
127
128      printf("Received %" CURL_FORMAT_CURL_OFF_T " bytes.\n", nread);
129    }
130
131    /* always cleanup */
132    curl_easy_cleanup(curl);
133  }
134  return 0;
135}
136