151 lines
4.9 KiB
C
151 lines
4.9 KiB
C
/***************************************************************************
|
|
* _ _ ____ _
|
|
* Project ___| | | | _ \| |
|
|
* / __| | | | |_) | |
|
|
* | (__| |_| | _ <| |___
|
|
* \___|\___/|_| \_\_____|
|
|
*
|
|
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
*
|
|
* This software is licensed as described in the file COPYING, which
|
|
* you should have received as part of this distribution. The terms
|
|
* are also available at https://curl.se/docs/copyright.html.
|
|
*
|
|
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|
* copies of the Software, and permit persons to whom the Software is
|
|
* furnished to do so, under the terms of the COPYING file.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
* SPDX-License-Identifier: curl
|
|
*
|
|
***************************************************************************/
|
|
|
|
/* <DESC>
|
|
* Send email with SMTP
|
|
* </DESC>
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <curl/curl.h>
|
|
|
|
/*
|
|
* For an SMTP example using the multi interface please see smtp-multi.c.
|
|
*/
|
|
|
|
/* The libcurl options want plain addresses, the viewable headers in the mail
|
|
* can get a full name as well.
|
|
*/
|
|
#define FROM_ADDR "<sender@example.org>"
|
|
#define TO_ADDR "<addressee@example.net>"
|
|
#define CC_ADDR "<info@example.org>"
|
|
|
|
#define FROM_MAIL "Sender Person " FROM_ADDR
|
|
#define TO_MAIL "A Receiver " TO_ADDR
|
|
#define CC_MAIL "John CC Smith " CC_ADDR
|
|
|
|
static const char *payload_text =
|
|
"Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n"
|
|
"To: " TO_MAIL "\r\n"
|
|
"From: " FROM_MAIL "\r\n"
|
|
"Cc: " CC_MAIL "\r\n"
|
|
"Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
|
|
"rfcpedant.example.org>\r\n"
|
|
"Subject: SMTP example message\r\n"
|
|
"\r\n" /* empty line to divide headers from body, see RFC 5322 */
|
|
"The body of the message starts here.\r\n"
|
|
"\r\n"
|
|
"It could be a lot of lines, could be MIME encoded, whatever.\r\n"
|
|
"Check RFC 5322.\r\n";
|
|
|
|
struct upload_status {
|
|
size_t bytes_read;
|
|
};
|
|
|
|
static size_t payload_source(char *ptr, size_t size, size_t nmemb, void *userp)
|
|
{
|
|
struct upload_status *upload_ctx = (struct upload_status *)userp;
|
|
const char *data;
|
|
size_t room = size * nmemb;
|
|
|
|
if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
|
|
return 0;
|
|
}
|
|
|
|
data = &payload_text[upload_ctx->bytes_read];
|
|
|
|
if(data) {
|
|
size_t len = strlen(data);
|
|
if(room < len)
|
|
len = room;
|
|
memcpy(ptr, data, len);
|
|
upload_ctx->bytes_read += len;
|
|
|
|
return len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
CURL *curl;
|
|
CURLcode res = CURLE_OK;
|
|
struct curl_slist *recipients = NULL;
|
|
struct upload_status upload_ctx = { 0 };
|
|
|
|
curl = curl_easy_init();
|
|
if(curl) {
|
|
/* This is the URL for your mailserver */
|
|
curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
|
|
|
|
/* Note that this option is not strictly required, omitting it results in
|
|
* libcurl sending the MAIL FROM command with empty sender data. All
|
|
* autoresponses should have an empty reverse-path, and should be directed
|
|
* to the address in the reverse-path which triggered them. Otherwise,
|
|
* they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
|
|
* details.
|
|
*/
|
|
curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM_ADDR);
|
|
|
|
/* Add two recipients, in this particular case they correspond to the
|
|
* To: and Cc: addressees in the header, but they could be any kind of
|
|
* recipient. */
|
|
recipients = curl_slist_append(recipients, TO_ADDR);
|
|
recipients = curl_slist_append(recipients, CC_ADDR);
|
|
curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
|
|
|
|
/* We are using a callback function to specify the payload (the headers and
|
|
* body of the message). You could just use the CURLOPT_READDATA option to
|
|
* specify a FILE pointer to read from. */
|
|
curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
|
|
curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
|
|
curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
|
|
|
|
/* Send the message */
|
|
res = curl_easy_perform(curl);
|
|
|
|
/* Check for errors */
|
|
if(res != CURLE_OK)
|
|
fprintf(stderr, "curl_easy_perform() failed: %s\n",
|
|
curl_easy_strerror(res));
|
|
|
|
/* Free the list of recipients */
|
|
curl_slist_free_all(recipients);
|
|
|
|
/* curl does not send the QUIT command until you call cleanup, so you
|
|
* should be able to reuse this connection for additional messages
|
|
* (setting CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and
|
|
* calling curl_easy_perform() again. It may not be a good idea to keep
|
|
* the connection open for a long time though (more than a few minutes may
|
|
* result in the server timing out the connection), and you do want to
|
|
* clean up in the end.
|
|
*/
|
|
curl_easy_cleanup(curl);
|
|
}
|
|
|
|
return (int)res;
|
|
}
|