1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2017, 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 https://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 /* <DESC>
24 * SMTP example showing how to send mime e-mails
25 * </DESC>
26 */
27
28 #include <stdio.h>
29 #include <string.h>
30 #include <curl/curl.h>
31
32 /* This is a simple example showing how to send mime mail using libcurl's SMTP
33 * capabilities. For an example of using the multi interface please see
34 * smtp-multi.c.
35 *
36 * Note that this example requires libcurl 7.56.0 or above.
37 */
38
39 #define FROM "<sender@example.org>"
40 #define TO "<addressee@example.net>"
41 #define CC "<info@example.org>"
42
43 static const char *headers_text[] = {
44 "Date: Tue, 22 Aug 2017 14:08:43 +0100",
45 "To: " TO,
46 "From: " FROM " (Example User)",
47 "Cc: " CC " (Another example User)",
48 "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
49 "rfcpedant.example.org>",
50 "Subject: example sending a MIME-formatted message",
51 NULL
52 };
53
54 static const char inline_text[] =
55 "This is the inline text message of the e-mail.\r\n"
56 "\r\n"
57 " It could be a lot of lines that would be displayed in an e-mail\r\n"
58 "viewer that is not able to handle HTML.\r\n";
59
60 static const char inline_html[] =
61 "<html><body>\r\n"
62 "<p>This is the inline <b>HTML</b> message of the e-mail.</p>"
63 "<br />\r\n"
64 "<p>It could be a lot of HTML data that would be displayed by "
65 "e-mail viewers able to handle HTML.</p>"
66 "</body></html>\r\n";
67
68
main(void)69 int main(void)
70 {
71 CURL *curl;
72 CURLcode res = CURLE_OK;
73 struct curl_slist *headers = NULL;
74 struct curl_slist *recipients = NULL;
75 struct curl_slist *slist = NULL;
76 curl_mime *mime;
77 curl_mime *alt;
78 curl_mimepart *part;
79 const char **cpp;
80
81 curl = curl_easy_init();
82 if(curl) {
83 /* This is the URL for your mailserver */
84 curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
85
86 /* Note that this option isn't strictly required, omitting it will result
87 * in libcurl sending the MAIL FROM command with empty sender data. All
88 * autoresponses should have an empty reverse-path, and should be directed
89 * to the address in the reverse-path which triggered them. Otherwise,
90 * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
91 * details.
92 */
93 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
94
95 /* Add two recipients, in this particular case they correspond to the
96 * To: and Cc: addressees in the header, but they could be any kind of
97 * recipient. */
98 recipients = curl_slist_append(recipients, TO);
99 recipients = curl_slist_append(recipients, CC);
100 curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
101
102 /* Build and set the message header list. */
103 for(cpp = headers_text; *cpp; cpp++)
104 headers = curl_slist_append(headers, *cpp);
105 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
106
107 /* Build the mime message. */
108 mime = curl_mime_init(curl);
109
110 /* The inline part is an alternative proposing the html and the text
111 versions of the e-mail. */
112 alt = curl_mime_init(curl);
113
114 /* HTML message. */
115 part = curl_mime_addpart(alt);
116 curl_mime_data(part, inline_html, CURL_ZERO_TERMINATED);
117 curl_mime_type(part, "text/html");
118
119 /* Text message. */
120 part = curl_mime_addpart(alt);
121 curl_mime_data(part, inline_text, CURL_ZERO_TERMINATED);
122
123 /* Create the inline part. */
124 part = curl_mime_addpart(mime);
125 curl_mime_subparts(part, alt);
126 curl_mime_type(part, "multipart/alternative");
127 slist = curl_slist_append(NULL, "Content-Disposition: inline");
128 curl_mime_headers(part, slist, 1);
129
130 /* Add the current source program as an attachment. */
131 part = curl_mime_addpart(mime);
132 curl_mime_filedata(part, "smtp-mime.c");
133 curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);
134
135 /* Send the message */
136 res = curl_easy_perform(curl);
137
138 /* Check for errors */
139 if(res != CURLE_OK)
140 fprintf(stderr, "curl_easy_perform() failed: %s\n",
141 curl_easy_strerror(res));
142
143 /* Free lists. */
144 curl_slist_free_all(recipients);
145 curl_slist_free_all(headers);
146
147 /* curl won't send the QUIT command until you call cleanup, so you should
148 * be able to re-use this connection for additional messages (setting
149 * CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and calling
150 * curl_easy_perform() again. It may not be a good idea to keep the
151 * connection open for a very long time though (more than a few minutes
152 * may result in the server timing out the connection), and you do want to
153 * clean up in the end.
154 */
155 curl_easy_cleanup(curl);
156
157 /* Free multipart message. */
158 curl_mime_free(mime);
159 }
160
161 return (int)res;
162 }
163