1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
24 #include <curl/curl.h>
26 /* This is a simple example showing how to send mail using libcurl's SMTP
27 * capabilities. It builds on the smtp-mail.c example to add authentication
28 * and, more importantly, transport security to protect the authentication
29 * details from being snooped.
31 * Note that this example requires libcurl 7.20.0 or above.
34 #define FROM "<sender@example.org>"
35 #define TO "<addressee@example.net>"
36 #define CC "<info@example.org>"
38 static const char *payload_text[] = {
39 "Date: Mon, 29 Nov 2010 21:54:29 +1100\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 SSL 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",
48 "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
53 struct upload_status {
57 static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
59 struct upload_status *upload_ctx = (struct upload_status *)userp;
62 if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
66 data = payload_text[upload_ctx->lines_read];
69 size_t len = strlen(data);
70 memcpy(ptr, data, len);
71 upload_ctx->lines_read++;
82 CURLcode res = CURLE_OK;
83 struct curl_slist *recipients = NULL;
84 struct upload_status upload_ctx;
86 upload_ctx.lines_read = 0;
88 curl = curl_easy_init();
90 /* Set username and password */
91 curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
92 curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
94 /* This is the URL for your mailserver. Note the use of smtps:// rather
95 * than smtp:// to request a SSL based connection. */
96 curl_easy_setopt(curl, CURLOPT_URL, "smtps://mainserver.example.net");
98 /* If you want to connect to a site who isn't using a certificate that is
99 * signed by one of the certs in the CA bundle you have, you can skip the
100 * verification of the server's certificate. This makes the connection
103 * If you have a CA cert for the server stored someplace else than in the
104 * default bundle, then the CURLOPT_CAPATH option might come handy for
106 #ifdef SKIP_PEER_VERIFICATION
107 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
110 /* If the site you're connecting to uses a different host name that what
111 * they have mentioned in their server certificate's commonName (or
112 * subjectAltName) fields, libcurl will refuse to connect. You can skip
113 * this check, but this will make the connection less secure. */
114 #ifdef SKIP_HOSTNAME_VERFICATION
115 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
118 /* Note that this option isn't strictly required, omitting it will result in
119 * libcurl sending the MAIL FROM command with empty sender data. All
120 * autoresponses should have an empty reverse-path, and should be directed
121 * to the address in the reverse-path which triggered them. Otherwise, they
122 * could cause an endless loop. See RFC 5321 Section 4.5.5 for more details.
124 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
126 /* Add two recipients, in this particular case they correspond to the
127 * To: and Cc: addressees in the header, but they could be any kind of
129 recipients = curl_slist_append(recipients, TO);
130 recipients = curl_slist_append(recipients, CC);
131 curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
133 /* We're using a callback function to specify the payload (the headers and
134 * body of the message). You could just use the CURLOPT_READDATA option to
135 * specify a FILE pointer to read from. */
136 curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
137 curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
138 curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
140 /* Since the traffic will be encrypted, it is very useful to turn on debug
141 * information within libcurl to see what is happening during the
143 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
145 /* Send the message */
146 res = curl_easy_perform(curl);
148 /* Check for errors */
150 fprintf(stderr, "curl_easy_perform() failed: %s\n",
151 curl_easy_strerror(res));
153 /* Free the list of recipients */
154 curl_slist_free_all(recipients);
157 curl_easy_cleanup(curl);