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/*
23 * This is an example demonstrating how an application can pass in a custom
24 * socket to libcurl to use. This example also handles the connect itself.
25 */
26#include <stdio.h>
27#include <string.h>
28#include <stdlib.h>
29#include <curl/curl.h>
30
31#ifdef WIN32
32#include <windows.h>
33#include <winsock2.h>
34#include <ws2tcpip.h>
35#define close closesocket
36#else
37#include <sys/types.h>        /*  socket types              */
38#include <sys/socket.h>       /*  socket definitions        */
39#include <netinet/in.h>
40#include <arpa/inet.h>        /*  inet (3) funtions         */
41#include <unistd.h>           /*  misc. UNIX functions      */
42#endif
43
44#include <errno.h>
45
46/* The IP address and port number to connect to */
47#define IPADDR "127.0.0.1"
48#define PORTNUM 80
49
50#ifndef INADDR_NONE
51#define INADDR_NONE 0xffffffff
52#endif
53
54static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)
55{
56  int written = fwrite(ptr, size, nmemb, (FILE *)stream);
57  return written;
58}
59
60static curl_socket_t opensocket(void *clientp,
61                                curlsocktype purpose,
62                                struct curl_sockaddr *address)
63{
64  curl_socket_t sockfd;
65  (void)purpose;
66  (void)address;
67  sockfd = *(curl_socket_t *)clientp;
68  /* the actual externally set socket is passed in via the OPENSOCKETDATA
69     option */
70  return sockfd;
71}
72
73static int sockopt_callback(void *clientp, curl_socket_t curlfd,
74                            curlsocktype purpose)
75{
76  (void)clientp;
77  (void)curlfd;
78  (void)purpose;
79  /* This return code was added in libcurl 7.21.5 */
80  return CURL_SOCKOPT_ALREADY_CONNECTED;
81}
82
83int main(void)
84{
85  CURL *curl;
86  CURLcode res;
87  struct sockaddr_in servaddr;  /*  socket address structure  */
88  curl_socket_t sockfd;
89
90#ifdef WIN32
91  WSADATA wsaData;
92  int initwsa;
93
94  if((initwsa = WSAStartup(MAKEWORD(2,0), &wsaData)) != 0) {
95    printf("WSAStartup failed: %d\n", initwsa);
96    return 1;
97  }
98#endif
99
100  curl = curl_easy_init();
101  if(curl) {
102    /*
103     * Note that libcurl will internally think that you connect to the host
104     * and port that you specify in the URL option.
105     */
106    curl_easy_setopt(curl, CURLOPT_URL, "http://99.99.99.99:9999");
107
108    /* Create the socket "manually" */
109    if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) == CURL_SOCKET_BAD ) {
110      printf("Error creating listening socket.\n");
111      return 3;
112    }
113
114    memset(&servaddr, 0, sizeof(servaddr));
115    servaddr.sin_family = AF_INET;
116    servaddr.sin_port   = htons(PORTNUM);
117
118    if (INADDR_NONE == (servaddr.sin_addr.s_addr = inet_addr(IPADDR)))
119      return 2;
120
121    if(connect(sockfd,(struct sockaddr *) &servaddr, sizeof(servaddr)) ==
122       -1) {
123      close(sockfd);
124      printf("client error: connect: %s\n", strerror(errno));
125      return 1;
126    }
127
128    /* no progress meter please */
129    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L);
130
131    /* send all data to this function  */
132    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
133
134    /* call this function to get a socket */
135    curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket);
136    curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sockfd);
137
138    /* call this function to set options for the socket */
139    curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
140
141    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
142
143    res = curl_easy_perform(curl);
144
145    curl_easy_cleanup(curl);
146
147    if(res) {
148      printf("libcurl error: %d\n", res);
149      return 4;
150    }
151  }
152  return 0;
153}
154