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smtp-multi.c

Download smtp-multi.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2011, 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 http://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.
 *
 ***************************************************************************/ 
/* This is an example application source code sending SMTP mail using the
 * multi interface.
 */ 
 
#include <string.h>
#include <curl/curl.h>
 
/*
 * This is the list of basic details you need to tweak to get things right.
 */ 
#define USERNAME "user@example.com"
#define PASSWORD "123qwerty"
#define SMTPSERVER "smtp.example.com"
#define SMTPPORT ":587" 
#define RECIPIENT "<recipient@example.com>"
#define MAILFROM "<realuser@example.com>"
 
#define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000
 
/* Note that you should include the actual meta data headers here as well if
   you want the mail to have a Subject, another From:, show a To: or whatever
   you think your mail should feature! */ 
static const char *text[]={
  "one\n",
  "two\n",
  "three\n",
  " Hello, this is CURL email SMTP\n",
  NULL
};
 
struct WriteThis {
  int counter;
};
 
static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
{
  struct WriteThis *pooh = (struct WriteThis *)userp;
  const char *data;
 
  if(size*nmemb < 1)
    return 0;
 
  data = text[pooh->counter];
 
  if(data) {
    size_t len = strlen(data);
    memcpy(ptr, data, len);
    pooh->counter++; /* advance pointer */ 
    return len;
  }
  return 0;                         /* no more data left to deliver */ 
}
 
static struct timeval tvnow(void)
{
  /*
  ** time() returns the value of time in seconds since the Epoch.
  */ 
  struct timeval now;
  now.tv_sec = (long)time(NULL);
  now.tv_usec = 0;
  return now;
}
 
static long tvdiff(struct timeval newer, struct timeval older)
{
  return (newer.tv_sec-older.tv_sec)*1000+
    (newer.tv_usec-older.tv_usec)/1000;
}
 
int main(void)
{
   CURL *curl;
   CURLM *mcurl;
   int still_running = 1;
   struct timeval mp_start;
   struct WriteThis pooh;
   struct curl_slist* rcpt_list = NULL;
 
   pooh.counter = 0;
 
   curl_global_init(CURL_GLOBAL_DEFAULT);
 
   curl = curl_easy_init();
   if(!curl)
     return 1;
 
   mcurl = curl_multi_init();
   if(!mcurl)
     return 2;
 
   rcpt_list = curl_slist_append(rcpt_list, RECIPIENT);
   /* more addresses can be added here
      rcpt_list = curl_slist_append(rcpt_list, "<others@example.com>");
   */ 
 
   curl_easy_setopt(curl, CURLOPT_URL, "smtp://" SMTPSERVER SMTPPORT);
   curl_easy_setopt(curl, CURLOPT_USERNAME, USERNAME);
   curl_easy_setopt(curl, CURLOPT_PASSWORD, PASSWORD);
   curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
   curl_easy_setopt(curl, CURLOPT_MAIL_FROM, MAILFROM);
   curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, rcpt_list);
   curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
   curl_easy_setopt(curl, CURLOPT_READDATA, &pooh);
   curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
   curl_easy_setopt(curl, CURLOPT_SSLVERSION, 0L);
   curl_easy_setopt(curl, CURLOPT_SSL_SESSIONID_CACHE, 0L);
   curl_multi_add_handle(mcurl, curl);
 
   mp_start = tvnow();
 
  /* we start some action by calling perform right away */ 
  curl_multi_perform(mcurl, &still_running);
 
  while(still_running) {
    struct timeval timeout;
    int rc; /* select() return code */ 
 
    fd_set fdread;
    fd_set fdwrite;
    fd_set fdexcep;
    int maxfd = -1;
 
    long curl_timeo = -1;
 
    FD_ZERO(&fdread);
    FD_ZERO(&fdwrite);
    FD_ZERO(&fdexcep);
 
    /* set a suitable timeout to play around with */ 
    timeout.tv_sec = 1;
    timeout.tv_usec = 0;
 
    curl_multi_timeout(mcurl, &curl_timeo);
    if(curl_timeo >= 0) {
      timeout.tv_sec = curl_timeo / 1000;
      if(timeout.tv_sec > 1)
        timeout.tv_sec = 1;
      else
        timeout.tv_usec = (curl_timeo % 1000) * 1000;
    }
 
    /* get file descriptors from the transfers */ 
    curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd);
 
    /* In a real-world program you OF COURSE check the return code of the
       function calls.  On success, the value of maxfd is guaranteed to be
       greater or equal than -1.  We call select(maxfd + 1, ...), specially in
       case of (maxfd == -1), we call select(0, ...), which is basically equal
       to sleep. */ 
 
    rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
 
    if (tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) {
      fprintf(stderr, "ABORTING TEST, since it seems "
              "that it would have run forever.\n");
      break;
    }
 
    switch(rc) {
    case -1:
      /* select error */ 
      break;
    case 0: /* timeout */ 
    default: /* action */ 
      curl_multi_perform(mcurl, &still_running);
      break;
    }
  }
 
  curl_slist_free_all(rcpt_list);
  curl_multi_remove_handle(mcurl, curl);
  curl_multi_cleanup(mcurl);
  curl_easy_cleanup(curl);
  curl_global_cleanup();
  return 0;
}