quickjs-tart

quickjs-based runtime for wallet-core logic
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smtp-authzid.c (5465B)

      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
      9  *
     10  * This software is licensed as described in the file COPYING, which
     11  * you should have received as part of this distribution. The terms
     12  * are also available at https://curl.se/docs/copyright.html.
     13  *
     14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
     15  * copies of the Software, and permit persons to whom the Software is
     16  * furnished to do so, under the terms of the COPYING file.
     17  *
     18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
     19  * KIND, either express or implied.
     20  *
     21  * SPDX-License-Identifier: curl
     22  *
     23  ***************************************************************************/
     24 
     25 /* <DESC>
     26  * Send email on behalf of another user with SMTP
     27  * </DESC>
     28  */
     29 
     30 #include <stdio.h>
     31 #include <string.h>
     32 #include <curl/curl.h>
     33 
     34 /*
     35  * This is a simple example show how to send an email using libcurl's SMTP
     36  * capabilities.
     37  *
     38  * Note that this example requires libcurl 7.66.0 or above.
     39  */
     40 
     41 /* The libcurl options want plain addresses, the viewable headers in the mail
     42  * can get a full name as well.
     43  */
     44 #define FROM_ADDR    "<ursel@example.org>"
     45 #define SENDER_ADDR  "<kurt@example.org>"
     46 #define TO_ADDR      "<addressee@example.net>"
     47 
     48 #define FROM_MAIL    "Ursel " FROM_ADDR
     49 #define SENDER_MAIL  "Kurt " SENDER_ADDR
     50 #define TO_MAIL      "A Receiver " TO_ADDR
     51 
     52 static const char *payload_text =
     53   "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n"
     54   "To: " TO_MAIL "\r\n"
     55   "From: " FROM_MAIL "\r\n"
     56   "Sender: " SENDER_MAIL "\r\n"
     57   "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
     58   "rfcpedant.example.org>\r\n"
     59   "Subject: SMTP example message\r\n"
     60   "\r\n" /* empty line to divide headers from body, see RFC 5322 */
     61   "The body of the message starts here.\r\n"
     62   "\r\n"
     63   "It could be a lot of lines, could be MIME encoded, whatever.\r\n"
     64   "Check RFC 5322.\r\n";
     65 
     66 struct upload_status {
     67   size_t bytes_read;
     68 };
     69 
     70 static size_t payload_source(char *ptr, size_t size, size_t nmemb, void *userp)
     71 {
     72   struct upload_status *upload_ctx = (struct upload_status *)userp;
     73   const char *data;
     74   size_t room = size * nmemb;
     75 
     76   if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
     77     return 0;
     78   }
     79 
     80   data = &payload_text[upload_ctx->bytes_read];
     81 
     82   if(data) {
     83     size_t len = strlen(data);
     84     if(room < len)
     85       len = room;
     86     memcpy(ptr, data, len);
     87     upload_ctx->bytes_read += len;
     88 
     89     return len;
     90   }
     91 
     92   return 0;
     93 }
     94 
     95 int main(void)
     96 {
     97   CURL *curl;
     98   CURLcode res = CURLE_OK;
     99   struct curl_slist *recipients = NULL;
    100   struct upload_status upload_ctx = { 0 };
    101 
    102   curl = curl_easy_init();
    103   if(curl) {
    104     /* This is the URL for your mailserver. In this example we connect to the
    105        smtp-submission port as we require an authenticated connection. */
    106     curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com:587");
    107 
    108     /* Set the username and password */
    109     curl_easy_setopt(curl, CURLOPT_USERNAME, "kurt");
    110     curl_easy_setopt(curl, CURLOPT_PASSWORD, "xipj3plmq");
    111 
    112     /* Set the authorization identity (identity to act as) */
    113     curl_easy_setopt(curl, CURLOPT_SASL_AUTHZID, "ursel");
    114 
    115     /* Force PLAIN authentication */
    116     curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=PLAIN");
    117 
    118     /* Note that this option is not strictly required, omitting it results in
    119      * libcurl sending the MAIL FROM command with empty sender data. All
    120      * autoresponses should have an empty reverse-path, and should be directed
    121      * to the address in the reverse-path which triggered them. Otherwise,
    122      * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
    123      * details.
    124      */
    125     curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM_ADDR);
    126 
    127     /* Add a recipient, in this particular case it corresponds to the
    128      * To: addressee in the header. */
    129     recipients = curl_slist_append(recipients, TO_ADDR);
    130     curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
    131 
    132     /* We are using a callback function to specify the payload (the headers and
    133      * body of the message). You could just use the CURLOPT_READDATA option to
    134      * specify a FILE pointer to read from. */
    135     curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
    136     curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
    137     curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
    138 
    139     /* Send the message */
    140     res = curl_easy_perform(curl);
    141 
    142     /* Check for errors */
    143     if(res != CURLE_OK)
    144       fprintf(stderr, "curl_easy_perform() failed: %s\n",
    145               curl_easy_strerror(res));
    146 
    147     /* Free the list of recipients */
    148     curl_slist_free_all(recipients);
    149 
    150     /* curl does not send the QUIT command until you call cleanup, so you
    151      * should be able to reuse this connection for additional messages
    152      * (setting CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and
    153      * calling curl_easy_perform() again. It may not be a good idea to keep
    154      * the connection open for a long time though (more than a few minutes may
    155      * result in the server timing out the connection), and you do want to
    156      * clean up in the end.
    157      */
    158     curl_easy_cleanup(curl);
    159   }
    160 
    161   return (int)res;
    162 }