2023-12-11 20:30:44 -05:00
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/* <DESC>
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* Send SMTP mime emails
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* </DESC>
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*/
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#include <stdio.h>
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#include <string.h>
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#include <curl/curl.h>
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/* This is a simple example showing how to send mime mail using libcurl's SMTP
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* capabilities. For an example of using the multi interface please see
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* smtp-multi.c.
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*
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* Note that this example requires libcurl 7.56.0 or above.
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*/
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#define FROM "<sender@example.org>"
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#define TO "<addressee@example.net>"
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#define CC "<info@example.org>"
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static const char *headers_text[] = {
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"Date: Tue, 22 Aug 2017 14:08:43 +0100",
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"To: " TO,
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"From: " FROM " (Example User)",
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"Cc: " CC " (Another example User)",
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"Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
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"rfcpedant.example.org>",
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"Subject: example sending a MIME-formatted message",
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NULL
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};
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static const char inline_text[] =
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"This is the inline text message of the email.\r\n"
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"\r\n"
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" It could be a lot of lines that would be displayed in an email\r\n"
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"viewer that is not able to handle HTML.\r\n";
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static const char inline_html[] =
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"<html><body>\r\n"
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"<p>This is the inline <b>HTML</b> message of the email.</p>"
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"<br />\r\n"
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"<p>It could be a lot of HTML data that would be displayed by "
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"email viewers able to handle HTML.</p>"
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"</body></html>\r\n";
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int main(void)
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{
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CURL *curl;
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CURLcode res = CURLE_OK;
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curl = curl_easy_init();
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if(curl) {
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struct curl_slist *headers = NULL;
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struct curl_slist *recipients = NULL;
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struct curl_slist *slist = NULL;
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curl_mime *mime;
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curl_mime *alt;
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curl_mimepart *part;
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const char **cpp;
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/* This is the URL for your mailserver */
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curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
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2024-05-15 15:20:32 -04:00
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/* Note that this option is not strictly required, omitting it results in
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* libcurl sending the MAIL FROM command with empty sender data. All
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* autoresponses should have an empty reverse-path, and should be directed
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* to the address in the reverse-path which triggered them. Otherwise,
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* they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
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* details.
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*/
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curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
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/* Add two recipients, in this particular case they correspond to the
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* To: and Cc: addressees in the header, but they could be any kind of
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* recipient. */
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recipients = curl_slist_append(recipients, TO);
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recipients = curl_slist_append(recipients, CC);
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curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
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/* allow one of the recipients to fail and still consider it okay */
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curl_easy_setopt(curl, CURLOPT_MAIL_RCPT_ALLOWFAILS, 1L);
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/* Build and set the message header list. */
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for(cpp = headers_text; *cpp; cpp++)
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headers = curl_slist_append(headers, *cpp);
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curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
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/* Build the mime message. */
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mime = curl_mime_init(curl);
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/* The inline part is an alternative proposing the html and the text
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versions of the email. */
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alt = curl_mime_init(curl);
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/* HTML message. */
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part = curl_mime_addpart(alt);
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curl_mime_data(part, inline_html, CURL_ZERO_TERMINATED);
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curl_mime_type(part, "text/html");
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/* Text message. */
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part = curl_mime_addpart(alt);
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curl_mime_data(part, inline_text, CURL_ZERO_TERMINATED);
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/* Create the inline part. */
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part = curl_mime_addpart(mime);
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curl_mime_subparts(part, alt);
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curl_mime_type(part, "multipart/alternative");
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slist = curl_slist_append(NULL, "Content-Disposition: inline");
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curl_mime_headers(part, slist, 1);
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/* Add the current source program as an attachment. */
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part = curl_mime_addpart(mime);
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curl_mime_filedata(part, "smtp-mime.c");
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curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);
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/* Send the message */
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res = curl_easy_perform(curl);
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/* Check for errors */
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if(res != CURLE_OK)
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fprintf(stderr, "curl_easy_perform() failed: %s\n",
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curl_easy_strerror(res));
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/* Free lists. */
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curl_slist_free_all(recipients);
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curl_slist_free_all(headers);
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2024-05-15 15:20:32 -04:00
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/* curl does not send the QUIT command until you call cleanup, so you
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* should be able to reuse this connection for additional messages
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* (setting CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and
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* calling curl_easy_perform() again. It may not be a good idea to keep
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* the connection open for a long time though (more than a few minutes may
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* result in the server timing out the connection), and you do want to
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* clean up in the end.
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*/
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curl_easy_cleanup(curl);
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/* Free multipart message. */
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curl_mime_free(mime);
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}
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return (int)res;
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}
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