Annotation of embedaddon/curl/docs/examples/smtp-multi.c, revision 1.1.1.1
1.1 misho 1: /***************************************************************************
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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 using the multi interface
25: * </DESC>
26: */
27:
28: #include <string.h>
29: #include <curl/curl.h>
30:
31: /* This is an example showing how to send mail using libcurl's SMTP
32: * capabilities. It builds on the smtp-mail.c example to demonstrate how to use
33: * libcurl's multi interface.
34: *
35: * Note that this example requires libcurl 7.20.0 or above.
36: */
37:
38: #define FROM "<sender@example.com>"
39: #define TO "<recipient@example.com>"
40: #define CC "<info@example.com>"
41:
42: #define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000
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 multi 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: static struct timeval tvnow(void)
87: {
88: struct timeval now;
89:
90: /* time() returns the value of time in seconds since the epoch */
91: now.tv_sec = (long)time(NULL);
92: now.tv_usec = 0;
93:
94: return now;
95: }
96:
97: static long tvdiff(struct timeval newer, struct timeval older)
98: {
99: return (newer.tv_sec - older.tv_sec) * 1000 +
100: (newer.tv_usec - older.tv_usec) / 1000;
101: }
102:
103: int main(void)
104: {
105: CURL *curl;
106: CURLM *mcurl;
107: int still_running = 1;
108: struct timeval mp_start;
109: struct curl_slist *recipients = NULL;
110: struct upload_status upload_ctx;
111:
112: upload_ctx.lines_read = 0;
113:
114: curl_global_init(CURL_GLOBAL_DEFAULT);
115:
116: curl = curl_easy_init();
117: if(!curl)
118: return 1;
119:
120: mcurl = curl_multi_init();
121: if(!mcurl)
122: return 2;
123:
124: /* This is the URL for your mailserver */
125: curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
126:
127: /* Note that this option isn't strictly required, omitting it will result in
128: * 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, they
131: * could cause an endless loop. See RFC 5321 Section 4.5.5 for more details.
132: */
133: curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
134:
135: /* Add two recipients, in this particular case they correspond to the
136: * To: and Cc: addressees in the header, but they could be any kind of
137: * recipient. */
138: recipients = curl_slist_append(recipients, TO);
139: recipients = curl_slist_append(recipients, CC);
140: curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
141:
142: /* We're using a callback function to specify the payload (the headers and
143: * body of the message). You could just use the CURLOPT_READDATA option to
144: * specify a FILE pointer to read from. */
145: curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
146: curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
147: curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
148:
149: /* Tell the multi stack about our easy handle */
150: curl_multi_add_handle(mcurl, curl);
151:
152: /* Record the start time which we can use later */
153: mp_start = tvnow();
154:
155: /* We start some action by calling perform right away */
156: curl_multi_perform(mcurl, &still_running);
157:
158: while(still_running) {
159: struct timeval timeout;
160: fd_set fdread;
161: fd_set fdwrite;
162: fd_set fdexcep;
163: int maxfd = -1;
164: int rc;
165: CURLMcode mc; /* curl_multi_fdset() return code */
166:
167: long curl_timeo = -1;
168:
169: /* Initialise the file descriptors */
170: FD_ZERO(&fdread);
171: FD_ZERO(&fdwrite);
172: FD_ZERO(&fdexcep);
173:
174: /* Set a suitable timeout to play around with */
175: timeout.tv_sec = 1;
176: timeout.tv_usec = 0;
177:
178: curl_multi_timeout(mcurl, &curl_timeo);
179: if(curl_timeo >= 0) {
180: timeout.tv_sec = curl_timeo / 1000;
181: if(timeout.tv_sec > 1)
182: timeout.tv_sec = 1;
183: else
184: timeout.tv_usec = (curl_timeo % 1000) * 1000;
185: }
186:
187: /* get file descriptors from the transfers */
188: mc = curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd);
189:
190: if(mc != CURLM_OK) {
191: fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
192: break;
193: }
194:
195: /* On success the value of maxfd is guaranteed to be >= -1. We call
196: select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
197: no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
198: to sleep 100ms, which is the minimum suggested value in the
199: curl_multi_fdset() doc. */
200:
201: if(maxfd == -1) {
202: #ifdef _WIN32
203: Sleep(100);
204: rc = 0;
205: #else
206: /* Portable sleep for platforms other than Windows. */
207: struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
208: rc = select(0, NULL, NULL, NULL, &wait);
209: #endif
210: }
211: else {
212: /* Note that on some platforms 'timeout' may be modified by select().
213: If you need access to the original value save a copy beforehand. */
214: rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
215: }
216:
217: if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) {
218: fprintf(stderr,
219: "ABORTING: Since it seems that we would have run forever.\n");
220: break;
221: }
222:
223: switch(rc) {
224: case -1: /* select error */
225: break;
226: case 0: /* timeout */
227: default: /* action */
228: curl_multi_perform(mcurl, &still_running);
229: break;
230: }
231: }
232:
233: /* Free the list of recipients */
234: curl_slist_free_all(recipients);
235:
236: /* Always cleanup */
237: curl_multi_remove_handle(mcurl, curl);
238: curl_multi_cleanup(mcurl);
239: curl_easy_cleanup(curl);
240: curl_global_cleanup();
241:
242: return 0;
243: }
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