1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2011, 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 <arpa/inet.h> /* inet (3) funtions */ 40#include <unistd.h> /* misc. UNIX functions */ 41#endif 42 43#include <errno.h> 44 45/* The IP address and port number to connect to */ 46#define IPADDR "127.0.0.1" 47#define PORTNUM 80 48 49static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream) 50{ 51 int written = fwrite(ptr, size, nmemb, (FILE *)stream); 52 return written; 53} 54 55static curl_socket_t opensocket(void *clientp, 56 curlsocktype purpose, 57 struct curl_sockaddr *address) 58{ 59 curl_socket_t sockfd = *(curl_socket_t *)clientp; 60 /* the actual externally set socket is passed in via the OPENSOCKETDATA 61 option */ 62 return sockfd; 63} 64 65static int sockopt_callback(void *clientp, curl_socket_t curlfd, 66 curlsocktype purpose) 67{ 68 /* This return code was added in libcurl 7.21.5 */ 69 return CURL_SOCKOPT_ALREADY_CONNECTED; 70} 71 72int main(void) 73{ 74 CURL *curl; 75 CURLcode res; 76 struct sockaddr_in servaddr; /* socket address structure */ 77 curl_socket_t sockfd; 78 79#ifdef WIN32 80 WSADATA wsaData; 81 int initwsa; 82 83 if((initwsa = WSAStartup(MAKEWORD(2,0), &wsaData)) != 0) { 84 printf("WSAStartup failed: %d\n", initwsa); 85 return 1; 86 } 87#endif 88 89 curl = curl_easy_init(); 90 if(curl) { 91 /* 92 * Note that libcurl will internally think that you connect to the host 93 * and port that you specify in the URL option. 94 */ 95 curl_easy_setopt(curl, CURLOPT_URL, "http://99.99.99.99:9999"); 96 97 /* Create the socket "manually" */ 98 if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ) { 99 printf("Error creating listening socket.\n"); 100 return 3; 101 } 102 103 memset(&servaddr, 0, sizeof(servaddr)); 104 servaddr.sin_family = AF_INET; 105 servaddr.sin_port = htons(PORTNUM); 106 107 if (INADDR_NONE == (servaddr.sin_addr.s_addr = inet_addr(IPADDR))) 108 return 2; 109 110 if(connect(sockfd,(struct sockaddr *) &servaddr, sizeof(servaddr)) == 111 -1) { 112 close(sockfd); 113 printf("client error: connect: %s\n", strerror(errno)); 114 return 1; 115 } 116 117 /* no progress meter please */ 118 curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L); 119 120 /* send all data to this function */ 121 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data); 122 123 /* call this function to get a socket */ 124 curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket); 125 curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sockfd); 126 127 /* call this function to set options for the socket */ 128 curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback); 129 130 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1); 131 132 res = curl_easy_perform(curl); 133 134 curl_easy_cleanup(curl); 135 136 if(res) { 137 printf("libcurl error: %d\n", res); 138 return 4; 139 } 140 } 141 return 0; 142} 143