1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2014, 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
write_data(void * ptr,size_t size,size_t nmemb,void * stream)54 static 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
opensocket(void * clientp,curlsocktype purpose,struct curl_sockaddr * address)60 static 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
sockopt_callback(void * clientp,curl_socket_t curlfd,curlsocktype purpose)73 static 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
main(void)83 int 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