Annotation of embedaddon/curl/docs/examples/smtp-ssl.c, revision 1.1.1.1
1.1 misho 1: /***************************************************************************
2: * _ _ ____ _
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6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2019, 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 SSL
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 SSL 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 smtps:// rather
102: * than smtp:// to request a SSL based connection. */
103: curl_easy_setopt(curl, CURLOPT_URL, "smtps://mainserver.example.net");
104:
105: /* If you want to connect to a site who isn't using a certificate that is
106: * signed by one of the certs in the CA bundle you have, you can skip the
107: * verification of the server's certificate. This makes the connection
108: * A LOT LESS SECURE.
109: *
110: * If you have a CA cert for the server stored someplace else than in the
111: * default bundle, then the CURLOPT_CAPATH option might come handy for
112: * you. */
113: #ifdef SKIP_PEER_VERIFICATION
114: curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
115: #endif
116:
117: /* If the site you're connecting to uses a different host name that what
118: * they have mentioned in their server certificate's commonName (or
119: * subjectAltName) fields, libcurl will refuse to connect. You can skip
120: * this check, but this will make the connection less secure. */
121: #ifdef SKIP_HOSTNAME_VERIFICATION
122: curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
123: #endif
124:
125: /* Note that this option isn't strictly required, omitting it will result
126: * in libcurl sending the MAIL FROM command with empty sender data. All
127: * autoresponses should have an empty reverse-path, and should be directed
128: * to the address in the reverse-path which triggered them. Otherwise,
129: * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
130: * details.
131: */
132: curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
133:
134: /* Add two recipients, in this particular case they correspond to the
135: * To: and Cc: addressees in the header, but they could be any kind of
136: * recipient. */
137: recipients = curl_slist_append(recipients, TO);
138: recipients = curl_slist_append(recipients, CC);
139: curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
140:
141: /* We're using a callback function to specify the payload (the headers and
142: * body of the message). You could just use the CURLOPT_READDATA option to
143: * specify a FILE pointer to read from. */
144: curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
145: curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
146: curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
147:
148: /* Since the traffic will be encrypted, it is very useful to turn on debug
149: * information within libcurl to see what is happening during the
150: * transfer */
151: curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
152:
153: /* Send the message */
154: res = curl_easy_perform(curl);
155:
156: /* Check for errors */
157: if(res != CURLE_OK)
158: fprintf(stderr, "curl_easy_perform() failed: %s\n",
159: curl_easy_strerror(res));
160:
161: /* Free the list of recipients */
162: curl_slist_free_all(recipients);
163:
164: /* Always cleanup */
165: curl_easy_cleanup(curl);
166: }
167:
168: return (int)res;
169: }
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