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