Annotation of embedaddon/curl/docs/examples/smtp-authzid.c, revision 1.1.1.1
1.1 misho 1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
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: * Send e-mail on behalf of another user with SMTP
25: * </DESC>
26: */
27:
28: #include <stdio.h>
29: #include <string.h>
30: #include <curl/curl.h>
31:
32: /*
33: * This is a simple example show how to send an email using libcurl's SMTP
34: * capabilities.
35: *
36: * Note that this example requires libcurl 7.66.0 or above.
37: */
38:
39: /* The libcurl options want plain addresses, the viewable headers in the mail
40: * can very well get a full name as well.
41: */
42: #define FROM_ADDR "<ursel@example.org>"
43: #define SENDER_ADDR "<kurt@example.org>"
44: #define TO_ADDR "<addressee@example.net>"
45:
46: #define FROM_MAIL "Ursel " FROM_ADDR
47: #define SENDER_MAIL "Kurt " SENDER_ADDR
48: #define TO_MAIL "A Receiver " TO_ADDR
49:
50: static const char *payload_text[] = {
51: "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
52: "To: " TO_MAIL "\r\n",
53: "From: " FROM_MAIL "\r\n",
54: "Sender: " SENDER_MAIL "\r\n",
55: "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
56: "rfcpedant.example.org>\r\n",
57: "Subject: SMTP example message\r\n",
58: "\r\n", /* empty line to divide headers from body, see RFC5322 */
59: "The body of the message starts here.\r\n",
60: "\r\n",
61: "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
62: "Check RFC5322.\r\n",
63: NULL
64: };
65:
66: struct upload_status {
67: int lines_read;
68: };
69:
70: static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
71: {
72: struct upload_status *upload_ctx = (struct upload_status *)userp;
73: const char *data;
74:
75: if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
76: return 0;
77: }
78:
79: data = payload_text[upload_ctx->lines_read];
80:
81: if(data) {
82: size_t len = strlen(data);
83: memcpy(ptr, data, len);
84: upload_ctx->lines_read++;
85:
86: return len;
87: }
88:
89: return 0;
90: }
91:
92: int main(void)
93: {
94: CURL *curl;
95: CURLcode res = CURLE_OK;
96: struct curl_slist *recipients = NULL;
97: struct upload_status upload_ctx;
98:
99: upload_ctx.lines_read = 0;
100:
101: curl = curl_easy_init();
102: if(curl) {
103: /* This is the URL for your mailserver. In this example we connect to the
104: smtp-submission port as we require an authenticated connection. */
105: curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com:587");
106:
107: /* Set the username and password */
108: curl_easy_setopt(curl, CURLOPT_USERNAME, "kurt");
109: curl_easy_setopt(curl, CURLOPT_PASSWORD, "xipj3plmq");
110:
111: /* Set the authorisation identity (identity to act as) */
112: curl_easy_setopt(curl, CURLOPT_SASL_AUTHZID, "ursel");
113:
114: /* Force PLAIN authentication */
115: curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=PLAIN");
116:
117: /* Note that this option isn't strictly required, omitting it will result
118: * in libcurl sending the MAIL FROM command with empty sender data. All
119: * autoresponses should have an empty reverse-path, and should be directed
120: * to the address in the reverse-path which triggered them. Otherwise,
121: * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
122: * details.
123: */
124: curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM_ADDR);
125:
126: /* Add a recipient, in this particular case it corresponds to the
127: * To: addressee in the header. */
128: recipients = curl_slist_append(recipients, TO_ADDR);
129: curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
130:
131: /* We're using a callback function to specify the payload (the headers and
132: * body of the message). You could just use the CURLOPT_READDATA option to
133: * specify a FILE pointer to read from. */
134: curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
135: curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
136: curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
137:
138: /* Send the message */
139: res = curl_easy_perform(curl);
140:
141: /* Check for errors */
142: if(res != CURLE_OK)
143: fprintf(stderr, "curl_easy_perform() failed: %s\n",
144: curl_easy_strerror(res));
145:
146: /* Free the list of recipients */
147: curl_slist_free_all(recipients);
148:
149: /* curl won't send the QUIT command until you call cleanup, so you should
150: * be able to re-use this connection for additional messages (setting
151: * CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and calling
152: * curl_easy_perform() again. It may not be a good idea to keep the
153: * connection open for a very long time though (more than a few minutes
154: * may result in the server timing out the connection), and you do want to
155: * clean up in the end.
156: */
157: curl_easy_cleanup(curl);
158: }
159:
160: return (int)res;
161: }
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