source3/nsswitch/wins.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 2.0
   4    a WINS nsswitch module
   5    Copyright (C) Andrew Tridgell 1999
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 */
  22
  23 #define NO_SYSLOG
  24
  25 #include "includes.h"
  26 #include <nss.h>
  27
  28 extern int DEBUGLEVEL;
  29
  30 #ifndef INADDRSZ
  31 #define INADDRSZ 4
  32 #endif
  33
  34 struct in_addr *lookup_backend(const char *name, int *count)
  35 {
  36         int fd;
  37         static int initialised;
  38         struct in_addr *ret;
  39         struct in_addr  p;
  40         int j;
  41
  42         if (!initialised) {
  43                 initialised = 1;
  44                 DEBUGLEVEL = 0;
  45                 TimeInit();
  46                 setup_logging("nss_wins",True);
  47                 charset_initialise();
  48                 lp_load(CONFIGFILE,True,False,False);
  49                 load_interfaces();
  50         }
  51
  52         *count = 0;
  53
  54         fd = open_socket_in(SOCK_DGRAM,0, 3, interpret_addr("0.0.0.0"), True);
  55         if (fd == -1) return NULL;
  56
  57         set_socket_options(fd,"SO_BROADCAST");
  58
  59 /* The next four lines commented out by JHT
  60    and replaced with the four lines following */
  61 /*      if( !zero_ip( wins_ip ) ) {
  62  *              ret = name_query( fd, name, 0x20, False, True, wins_src_ip(), count );
  63  *              goto out;
  64  *      }
  65  */
  66         p = wins_srv_ip();
  67         if( !zero_ip(p) ) {
  68                 ret = name_query(fd,name,0x20,False,True, p, count);
  69                 goto out;
  70         }
  71
  72         if (lp_wins_support()) {
  73                 /* we are our own WINS server */
  74                 ret = name_query(fd,name,0x20,False,True, *interpret_addr2("127.0.0.1"), count);
  75                 goto out;
  76         }
  77
  78         /* uggh, we have to broadcast to each interface in turn */
  79         for (j=iface_count() - 1;
  80              j >= 0;
  81              j--) {
  82                 struct in_addr *bcast = iface_n_bcast(j);
  83                 ret = name_query(fd,name,0x20,True,True,*bcast,count);
  84                 if (ret) break;
  85         }
  86
  87  out:
  88         close(fd);
  89         return ret;
  90 }
  91
  92
  93 /****************************************************************************
  94 gethostbyname() - we ignore any domain portion of the name and only
  95 handle names that are at most 15 characters long
  96   **************************************************************************/
  97 enum nss_status
  98 _nss_wins_gethostbyname_r(const char *name, struct hostent *he,
  99                           char *buffer, size_t buflen, int *errnop,
 100                           int *h_errnop)
 101 {
 102         char **host_addresses;
 103         struct in_addr *ip_list;
 104         int i, count;
 105
 106         ip_list = lookup_backend(name, &count);
 107         if (!ip_list) {
 108                 return NSS_STATUS_NOTFOUND;
 109         }
 110
 111         if (buflen < (2*count+1)*INADDRSZ) {
 112                 /* no ENOMEM error type?! */
 113                 return NSS_STATUS_NOTFOUND;
 114         }
 115
 116
 117         host_addresses = (char **)buffer;
 118         he->h_addr_list = host_addresses;
 119         host_addresses[count] = NULL;
 120         buffer += (count + 1) * INADDRSZ;
 121         buflen += (count + 1) * INADDRSZ;
 122         he->h_addrtype = AF_INET;
 123         he->h_length = INADDRSZ;
 124
 125         for (i=0;i<count;i++) {
 126                 memcpy(buffer, &ip_list[i].s_addr, INADDRSZ);
 127                 *host_addresses = buffer;
 128                 buffer += INADDRSZ;
 129                 buflen -= INADDRSZ;
 130                 host_addresses++;
 131         }
 132
 133         if (ip_list) free(ip_list);
 134
 135         return NSS_STATUS_SUCCESS;
 136 }