lib/hostip.c

   1 /*****************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  *  The contents of this file are subject to the Mozilla Public License
   9  *  Version 1.0 (the "License"); you may not use this file except in
  10  *  compliance with the License. You may obtain a copy of the License at
  11  *  http://www.mozilla.org/MPL/
  12  *
  13  *  Software distributed under the License is distributed on an "AS IS"
  14  *  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
  15  *  License for the specific language governing rights and limitations
  16  *  under the License.
  17  *
  18  *  The Original Code is Curl.
  19  *
  20  *  The Initial Developer of the Original Code is Daniel Stenberg.
  21  *
  22  *  Portions created by the Initial Developer are Copyright (C) 1998.
  23  *  All Rights Reserved.
  24  *
  25  * ------------------------------------------------------------
  26  * Main author:
  27  * - Daniel Stenberg <Daniel.Stenberg@haxx.nu>
  28  *
  29  *      http://curl.haxx.nu
  30  *
  31  * $Source: /cvsroot/curl/curl/lib/hostip.c,v $
  32  * $Revision: 1.1.1.1 $
  33  * $Date: 1999-12-29 14:21:31 $
  34  * $Author: bagder $
  35  * $State: Exp $
  36  * $Locker:  $
  37  *
  38  * ------------------------------------------------------------
  39  ****************************************************************************/
  40
  41 #include <string.h>
  42
  43 #include "setup.h"
  44
  45 #if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
  46 #include <winsock.h>
  47 #else
  48 #ifdef HAVE_SYS_TYPES_H
  49 #include <sys/types.h>
  50 #endif
  51 #ifdef HAVE_SYS_SOCKET_H
  52 #include <sys/socket.h>
  53 #endif
  54 #include <netinet/in.h>
  55 #include <netdb.h>
  56 #ifdef HAVE_ARPA_INET_H
  57 #include <arpa/inet.h>
  58 #endif
  59 #endif
  60
  61 #include "urldata.h"
  62 #include "sendf.h"
  63
  64 /* --- resolve name or IP-number --- */
  65
  66 char *MakeIP(unsigned long num)
  67 {
  68 #ifdef HAVE_INET_NTOA
  69   struct in_addr in;
  70
  71   in.s_addr = htonl(num);
  72   return (inet_ntoa(in));
  73 #else
  74   static char addr[128];
  75   unsigned char *paddr;
  76
  77   num = htonl(num);  /* htonl() added to avoid endian probs */
  78   paddr = (unsigned char *)&num;
  79   sprintf(addr, "%u.%u.%u.%u", paddr[0], paddr[1], paddr[2], paddr[3]);
  80   return (addr);
  81 #endif
  82 }
  83
  84 /* Stolen from Dancer source code, written by
  85    Bjorn Reese <breese@imada.ou.dk> */
  86 #ifndef INADDR_NONE
  87 #define INADDR_NONE (unsigned long) ~0
  88 #endif
  89 struct hostent *GetHost(struct UrlData *data, char *hostname)
  90 {
  91   struct hostent *h = NULL;
  92   unsigned long in;
  93   static struct hostent he;
  94   static char name[MAXHOSTNAMELEN];
  95   static char *addrlist[2];
  96   static struct in_addr addrentry;
  97
  98   if ( (in=inet_addr(hostname)) != INADDR_NONE ) {
  99     addrentry.s_addr = in;
 100     addrlist[0] = (char *)&addrentry;
 101     addrlist[1] = NULL;
 102     he.h_name = strncpy(name, MakeIP(ntohl(in)), MAXHOSTNAMELEN);
 103     he.h_addrtype = AF_INET;
 104     he.h_length = sizeof(struct in_addr);
 105     he.h_addr_list = addrlist;
 106     h = &he;
 107   } else if ( (h=gethostbyname(hostname)) == NULL ) {
 108     infof(data, "gethostbyname(2) failed for %s\n", hostname);
 109   }
 110   return (h);
 111 }