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