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-/***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2019, 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>
- * Send e-mail on behalf of another user with SMTP
- * </DESC>
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <curl/curl.h>
-
-/*
- * This is a simple example show how to send an email using libcurl's SMTP
- * capabilities.
- *
- * Note that this example requires libcurl 7.66.0 or above.
- */
-
-/* The libcurl options want plain addresses, the viewable headers in the mail
- * can very well get a full name as well.
- */
-#define FROM_ADDR "<ursel@example.org>"
-#define SENDER_ADDR "<kurt@example.org>"
-#define TO_ADDR "<addressee@example.net>"
-
-#define FROM_MAIL "Ursel " FROM_ADDR
-#define SENDER_MAIL "Kurt " SENDER_ADDR
-#define TO_MAIL "A Receiver " TO_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",
- "Sender: " SENDER_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 RFC5322 */
- "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 RFC5322.\r\n",
- NULL
-};
-
-struct upload_status {
- int lines_read;
-};
-
-static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
-{
- struct upload_status *upload_ctx = (struct upload_status *)userp;
- const char *data;
-
- if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
- return 0;
- }
-
- data = payload_text[upload_ctx->lines_read];
-
- if(data) {
- size_t len = strlen(data);
- memcpy(ptr, data, len);
- upload_ctx->lines_read++;
-
- return len;
- }
-
- return 0;
-}
-
-int main(void)
-{
- CURL *curl;
- CURLcode res = CURLE_OK;
- struct curl_slist *recipients = NULL;
- struct upload_status upload_ctx;
-
- upload_ctx.lines_read = 0;
-
- curl = curl_easy_init();
- if(curl) {
- /* This is the URL for your mailserver. In this example we connect to the
- smtp-submission port as we require an authenticated connection. */
- curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com:587");
-
- /* Set the username and password */
- curl_easy_setopt(curl, CURLOPT_USERNAME, "kurt");
- curl_easy_setopt(curl, CURLOPT_PASSWORD, "xipj3plmq");
-
- /* Set the authorisation identity (identity to act as) */
- curl_easy_setopt(curl, CURLOPT_SASL_AUTHZID, "ursel");
-
- /* Force PLAIN authentication */
- curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=PLAIN");
-
- /* 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_ADDR);
-
- /* Add a recipient, in this particular case it corresponds to the
- * To: addressee in the header. */
- recipients = curl_slist_append(recipients, TO_ADDR);
- curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
-
- /* We're 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 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);
- }
-
- return (int)res;
-}