/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2017, 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.haxx.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. * ***************************************************************************/ /* <DESC> * SMTP example showing how to send mime e-mails * </DESC> */ #include <stdio.h> #include <string.h> #include <curl/curl.h> /* This is a simple example showing how to send mime mail using libcurl's SMTP * capabilities. For an example of using the multi interface please see * smtp-multi.c. * * Note that this example requires libcurl 7.56.0 or above. */ #define FROM "<sender@example.org>" #define TO "<addressee@example.net>" #define CC "<info@example.org>" static const char *headers_text[] = { "Date: Tue, 22 Aug 2017 14:08:43 +0100", "To: " TO, "From: " FROM " (Example User)", "Cc: " CC " (Another example User)", "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@" "rfcpedant.example.org>", "Subject: example sending a MIME-formatted message", NULL }; static const char inline_text[] = "This is the inline text message of the e-mail.\r\n" "\r\n" " It could be a lot of lines that would be displayed in an e-mail\r\n" "viewer that is not able to handle HTML.\r\n"; static const char inline_html[] = "<html><body>\r\n" "<p>This is the inline <b>HTML</b> message of the e-mail.</p>" "<br />\r\n" "<p>It could be a lot of HTML data that would be displayed by " "e-mail viewers able to handle HTML.</p>" "</body></html>\r\n"; int main(void) { CURL *curl; CURLcode res = CURLE_OK; struct curl_slist *headers = NULL; struct curl_slist *recipients = NULL; struct curl_slist *slist = NULL; curl_mime *mime; curl_mime *alt; curl_mimepart *part; const char **cpp; 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 isn't strictly required, omitting it will result * 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); /* 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); recipients = curl_slist_append(recipients, CC); curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients); /* Build and set the message header list. */ for(cpp = headers_text; *cpp; cpp++) headers = curl_slist_append(headers, *cpp); curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); /* Build the mime message. */ mime = curl_mime_init(curl); /* The inline part is an alternative proposing the html and the text versions of the e-mail. */ alt = curl_mime_init(curl); /* HTML message. */ part = curl_mime_addpart(alt); curl_mime_data(part, inline_html, CURL_ZERO_TERMINATED); curl_mime_type(part, "text/html"); /* Text message. */ part = curl_mime_addpart(alt); curl_mime_data(part, inline_text, CURL_ZERO_TERMINATED); /* Create the inline part. */ part = curl_mime_addpart(mime); curl_mime_subparts(part, alt); curl_mime_type(part, "multipart/alternative"); slist = curl_slist_append(NULL, "Content-Disposition: inline"); curl_mime_headers(part, slist, 1); /* Add the current source program as an attachment. */ part = curl_mime_addpart(mime); curl_mime_filedata(part, "smtp-mime.c"); curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime); /* 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 lists. */ curl_slist_free_all(recipients); curl_slist_free_all(headers); /* curl won't send the QUIT command until you call cleanup, so you should * be able to re-use 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 very 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); /* Free multipart message. */ curl_mime_free(mime); } return (int)res; }