resolve.c

THIS IS HTTP CURL Example

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2006, Daniel Stenberg, <[e-mail]>, 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.
 *
 * $Id: resolve.c,v 1.7 2006-10-11 16:01:20 yangtse Exp $
 ***************************************************************************/

/* Purpose
 *
 * Resolve the given name, using system name resolve functions (NOT any
 * function provided by libcurl). Used to see if the name exists and thus if
 * we can allow a test case to use it for testing.
 *
 * Like if 'localhost' actual exists etc.
 *
 */
#include "setup.h" /* portability help from the lib directory */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <signal.h>
#include <time.h>
#include <ctype.h>
#include <sys/time.h>
#include <sys/types.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef _XOPEN_SOURCE_EXTENDED
/* This define is "almost" required to build on HPUX 11 */
#include <arpa/inet.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif

#define ENABLE_CURLX_PRINTF
/* make the curlx header define all printf() functions to use the curlx_*
   versions instead */
#include "curlx.h" /* from the private lib dir */
#include "util.h"

/* include memdebug.h last */
#include "memdebug.h"

char use_ipv6=FALSE;

const char *serverlogfile=""; /* for a util.c function we don't use */

int main(int argc, char *argv[])
{
  int arg=1;
  char *host;
  int rc;

  while(argc>arg) {
    if(!strcmp("--version", argv[arg])) {
      printf("resolve IPv4%s\n",
#ifdef ENABLE_IPV6
             "/IPv6"
#else
             ""
#endif
             );
      return 0;
    }
    else if(!strcmp("--ipv6", argv[arg])) {
#ifdef ENABLE_IPV6
      use_ipv6=TRUE;
#endif
      arg++;
    }
    else if(!strcmp("--ipv4", argv[arg])) {
      /* for completeness, we support this option as well */
      use_ipv6=FALSE;
      arg++;
    }
    else {
      host = argv[arg++];
    }
  }
  if(!host) {
    puts("Usage: resolve [option] <host>\n"
         " --version\n"
         " --ipv4\n"
         " --ipv6");
    return 0;
  }

#ifdef WIN32
  win32_init();
  atexit(win32_cleanup);
#endif

#ifdef ENABLE_IPV6
  if(!use_ipv6)
#endif
  {
    /* gethostbyname() resolve */
    struct hostent *he;

    he = gethostbyname(host);

    rc = !he;
  }
#ifdef ENABLE_IPV6
  else {
    /* getaddrinfo() resolve */
    struct addrinfo *ai;
    struct addrinfo hints;

    memset(&hints, 0, sizeof(hints));
    hints.ai_family = PF_INET6;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = AI_CANONNAME;
    rc = (getaddrinfo)(host, "80", &hints, &ai);

  }
#endif
  if(rc)
    printf("Resolving '%s' didn't work\n", host);

  return !rc?0:1;
}