1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel (at) 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 (at) example.com>" 33 #define TO "<recipient (at) example.com>" 34 #define CC "<info (at) example.com>" 35 36 #define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000 37 38 static 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 (at) 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 53 struct upload_status { 54 int lines_read; 55 }; 56 57 static 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 79 static 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 90 static 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 96 int 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 CURLMcode mc; /* curl_multi_fdset() return code */ 159 160 long curl_timeo = -1; 161 162 /* Initialise the file descriptors */ 163 FD_ZERO(&fdread); 164 FD_ZERO(&fdwrite); 165 FD_ZERO(&fdexcep); 166 167 /* Set a suitable timeout to play around with */ 168 timeout.tv_sec = 1; 169 timeout.tv_usec = 0; 170 171 curl_multi_timeout(mcurl, &curl_timeo); 172 if(curl_timeo >= 0) { 173 timeout.tv_sec = curl_timeo / 1000; 174 if(timeout.tv_sec > 1) 175 timeout.tv_sec = 1; 176 else 177 timeout.tv_usec = (curl_timeo % 1000) * 1000; 178 } 179 180 /* get file descriptors from the transfers */ 181 mc = curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd); 182 183 if(mc != CURLM_OK) 184 { 185 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); 186 break; 187 } 188 189 /* On success the value of maxfd is guaranteed to be >= -1. We call 190 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are 191 no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- 192 to sleep 100ms, which is the minimum suggested value in the 193 curl_multi_fdset() doc. */ 194 195 if(maxfd == -1) { 196 #ifdef _WIN32 197 Sleep(100); 198 rc = 0; 199 #else 200 /* Portable sleep for platforms other than Windows. */ 201 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 202 rc = select(0, NULL, NULL, NULL, &wait); 203 #endif 204 } 205 else { 206 /* Note that on some platforms 'timeout' may be modified by select(). 207 If you need access to the original value save a copy beforehand. */ 208 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 209 } 210 211 if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) { 212 fprintf(stderr, 213 "ABORTING: Since it seems that we would have run forever.\n"); 214 break; 215 } 216 217 switch(rc) { 218 case -1: /* select error */ 219 break; 220 case 0: /* timeout */ 221 default: /* action */ 222 curl_multi_perform(mcurl, &still_running); 223 break; 224 } 225 } 226 227 /* Free the list of recipients */ 228 curl_slist_free_all(recipients); 229 230 /* Always cleanup */ 231 curl_multi_remove_handle(mcurl, curl); 232 curl_multi_cleanup(mcurl); 233 curl_easy_cleanup(curl); 234 curl_global_cleanup(); 235 236 return 0; 237 } 238
