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#include <string.h> 23#include <curl/curl.h> 24 25/* This is an example showing how to send mail using libcurl's SMTP 26 * capabilities. It builds on the smtp-mail.c example to demonstrate how to use 27 * libcurl's multi interface. 28 * 29 * Note that this example requires libcurl 7.20.0 or above. 30 */ 31 32#define FROM "<sender@example.com>" 33#define TO "<recipient@example.com>" 34#define CC "<info@example.com>" 35 36#define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000 37 38static const char *payload_text[] = { 39 "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n", 40 "To: " TO "\r\n", 41 "From: " FROM "(Example User)\r\n", 42 "Cc: " CC "(Another example User)\r\n", 43 "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@rfcpedant.example.org>\r\n", 44 "Subject: SMTP multi example message\r\n", 45 "\r\n", /* empty line to divide headers from body, see RFC5322 */ 46 "The body of the message starts here.\r\n", 47 "\r\n", 48 "It could be a lot of lines, could be MIME encoded, whatever.\r\n", 49 "Check RFC5322.\r\n", 50 NULL 51}; 52 53struct upload_status { 54 int lines_read; 55}; 56 57static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp) 58{ 59 struct upload_status *upload_ctx = (struct upload_status *)userp; 60 const char *data; 61 62 if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) { 63 return 0; 64 } 65 66 data = payload_text[upload_ctx->lines_read]; 67 68 if(data) { 69 size_t len = strlen(data); 70 memcpy(ptr, data, len); 71 upload_ctx->lines_read++; 72 73 return len; 74 } 75 76 return 0; 77} 78 79static struct timeval tvnow(void) 80{ 81 struct timeval now; 82 83 /* time() returns the value of time in seconds since the epoch */ 84 now.tv_sec = (long)time(NULL); 85 now.tv_usec = 0; 86 87 return now; 88} 89 90static long tvdiff(struct timeval newer, struct timeval older) 91{ 92 return (newer.tv_sec - older.tv_sec) * 1000 + 93 (newer.tv_usec - older.tv_usec) / 1000; 94} 95 96int main(void) 97{ 98 CURL *curl; 99 CURLM *mcurl; 100 int still_running = 1; 101 struct timeval mp_start; 102 struct curl_slist *recipients = NULL; 103 struct upload_status upload_ctx; 104 105 upload_ctx.lines_read = 0; 106 107 curl_global_init(CURL_GLOBAL_DEFAULT); 108 109 curl = curl_easy_init(); 110 if(!curl) 111 return 1; 112 113 mcurl = curl_multi_init(); 114 if(!mcurl) 115 return 2; 116 117 /* This is the URL for your mailserver */ 118 curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com"); 119 120 /* Note that this option isn't strictly required, omitting it will result in 121 * libcurl sending the MAIL FROM command with empty sender data. All 122 * autoresponses should have an empty reverse-path, and should be directed 123 * to the address in the reverse-path which triggered them. Otherwise, they 124 * could cause an endless loop. See RFC 5321 Section 4.5.5 for more details. 125 */ 126 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM); 127 128 /* Add two recipients, in this particular case they correspond to the 129 * To: and Cc: addressees in the header, but they could be any kind of 130 * recipient. */ 131 recipients = curl_slist_append(recipients, TO); 132 recipients = curl_slist_append(recipients, CC); 133 curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients); 134 135 /* We're using a callback function to specify the payload (the headers and 136 * body of the message). You could just use the CURLOPT_READDATA option to 137 * specify a FILE pointer to read from. */ 138 curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source); 139 curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx); 140 curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L); 141 142 /* Tell the multi stack about our easy handle */ 143 curl_multi_add_handle(mcurl, curl); 144 145 /* Record the start time which we can use later */ 146 mp_start = tvnow(); 147 148 /* We start some action by calling perform right away */ 149 curl_multi_perform(mcurl, &still_running); 150 151 while(still_running) { 152 struct timeval timeout; 153 fd_set fdread; 154 fd_set fdwrite; 155 fd_set fdexcep; 156 int maxfd = -1; 157 int rc; 158 159 long curl_timeo = -1; 160 161 /* Initialise the file descriptors */ 162 FD_ZERO(&fdread); 163 FD_ZERO(&fdwrite); 164 FD_ZERO(&fdexcep); 165 166 /* Set a suitable timeout to play around with */ 167 timeout.tv_sec = 1; 168 timeout.tv_usec = 0; 169 170 curl_multi_timeout(mcurl, &curl_timeo); 171 if(curl_timeo >= 0) { 172 timeout.tv_sec = curl_timeo / 1000; 173 if(timeout.tv_sec > 1) 174 timeout.tv_sec = 1; 175 else 176 timeout.tv_usec = (curl_timeo % 1000) * 1000; 177 } 178 179 /* Get file descriptors from the transfers */ 180 curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd); 181 182 /* In a real-world program you OF COURSE check the return code of the 183 function calls. On success, the value of maxfd is guaranteed to be 184 greater or equal than -1. We call select(maxfd + 1, ...), specially in 185 case of (maxfd == -1), we call select(0, ...), which is basically equal 186 to sleep. */ 187 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 188 189 if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) { 190 fprintf(stderr, 191 "ABORTING: Since it seems that we would have run forever.\n"); 192 break; 193 } 194 195 switch(rc) { 196 case -1: /* select error */ 197 break; 198 case 0: /* timeout */ 199 default: /* action */ 200 curl_multi_perform(mcurl, &still_running); 201 break; 202 } 203 } 204 205 /* Free the list of recipients */ 206 curl_slist_free_all(recipients); 207 208 /* Always cleanup */ 209 curl_multi_remove_handle(mcurl, curl); 210 curl_multi_cleanup(mcurl); 211 curl_easy_cleanup(curl); 212 curl_global_cleanup(); 213 214 return 0; 215} 216