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deps/curl/docs/examples/smtp-authzid.c

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+/***************************************************************************
+ *                                  _   _ ____  _
+ *  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 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 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 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. 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 authorization 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 is not 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 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 will 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;
+}