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comparison mupdf-source/thirdparty/curl/docs/examples/smtp-tls.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2016, 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 using TLS
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 mail using libcurl's SMTP
33 * capabilities. It builds on the smtp-mail.c example to add authentication
34 * and, more importantly, transport security to protect the authentication
35 * details from being snooped.
36 *
37 * Note that this example requires libcurl 7.20.0 or above.
38 */
39
40 #define FROM "<sender@example.org>"
41 #define TO "<addressee@example.net>"
42 #define CC "<info@example.org>"
43
44 static const char *payload_text[] = {
45 "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
46 "To: " TO "\r\n",
47 "From: " FROM " (Example User)\r\n",
48 "Cc: " CC " (Another example User)\r\n",
49 "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
50 "rfcpedant.example.org>\r\n",
51 "Subject: SMTP TLS example message\r\n",
52 "\r\n", /* empty line to divide headers from body, see RFC5322 */
53 "The body of the message starts here.\r\n",
54 "\r\n",
55 "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
56 "Check RFC5322.\r\n",
57 NULL
58 };
59
60 struct upload_status {
61 int lines_read;
62 };
63
64 static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
65 {
66 struct upload_status *upload_ctx = (struct upload_status *)userp;
67 const char *data;
68
69 if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
70 return 0;
71 }
72
73 data = payload_text[upload_ctx->lines_read];
74
75 if(data) {
76 size_t len = strlen(data);
77 memcpy(ptr, data, len);
78 upload_ctx->lines_read++;
79
80 return len;
81 }
82
83 return 0;
84 }
85
86 int main(void)
87 {
88 CURL *curl;
89 CURLcode res = CURLE_OK;
90 struct curl_slist *recipients = NULL;
91 struct upload_status upload_ctx;
92
93 upload_ctx.lines_read = 0;
94
95 curl = curl_easy_init();
96 if(curl) {
97 /* Set username and password */
98 curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
99 curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
100
101 /* This is the URL for your mailserver. Note the use of port 587 here,
102 * instead of the normal SMTP port (25). Port 587 is commonly used for
103 * secure mail submission (see RFC4403), but you should use whatever
104 * matches your server configuration. */
105 curl_easy_setopt(curl, CURLOPT_URL, "smtp://mainserver.example.net:587");
106
107 /* In this example, we'll start with a plain text connection, and upgrade
108 * to Transport Layer Security (TLS) using the STARTTLS command. Be careful
109 * of using CURLUSESSL_TRY here, because if TLS upgrade fails, the transfer
110 * will continue anyway - see the security discussion in the libcurl
111 * tutorial for more details. */
112 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
113
114 /* If your server doesn't have a valid certificate, then you can disable
115 * part of the Transport Layer Security protection by setting the
116 * CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST options to 0 (false).
117 * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
118 * curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
119 * That is, in general, a bad idea. It is still better than sending your
120 * authentication details in plain text though. Instead, you should get
121 * the issuer certificate (or the host certificate if the certificate is
122 * self-signed) and add it to the set of certificates that are known to
123 * libcurl using CURLOPT_CAINFO and/or CURLOPT_CAPATH. See docs/SSLCERTS
124 * for more information. */
125 curl_easy_setopt(curl, CURLOPT_CAINFO, "/path/to/certificate.pem");
126
127 /* Note that this option isn't strictly required, omitting it will result
128 * in libcurl sending the MAIL FROM command with empty sender data. All
129 * autoresponses should have an empty reverse-path, and should be directed
130 * to the address in the reverse-path which triggered them. Otherwise,
131 * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
132 * details.
133 */
134 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
135
136 /* Add two recipients, in this particular case they correspond to the
137 * To: and Cc: addressees in the header, but they could be any kind of
138 * recipient. */
139 recipients = curl_slist_append(recipients, TO);
140 recipients = curl_slist_append(recipients, CC);
141 curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
142
143 /* We're using a callback function to specify the payload (the headers and
144 * body of the message). You could just use the CURLOPT_READDATA option to
145 * specify a FILE pointer to read from. */
146 curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
147 curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
148 curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
149
150 /* Since the traffic will be encrypted, it is very useful to turn on debug
151 * information within libcurl to see what is happening during the transfer.
152 */
153 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
154
155 /* Send the message */
156 res = curl_easy_perform(curl);
157
158 /* Check for errors */
159 if(res != CURLE_OK)
160 fprintf(stderr, "curl_easy_perform() failed: %s\n",
161 curl_easy_strerror(res));
162
163 /* Free the list of recipients */
164 curl_slist_free_all(recipients);
165
166 /* Always cleanup */
167 curl_easy_cleanup(curl);
168 }
169
170 return (int)res;
171 }