source/nsswitch/winbindd_wins.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 2.0
   4
   5    Winbind daemon - WINS related functions
   6
   7    Copyright (C) Andrew Tridgell 1999
   8    Copyright (C) Herb Lewis 2002
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "winbindd.h"
  26
  27 /* Use our own create socket code so we don't recurse.... */
  28
  29 static int wins_lookup_open_socket_in(void)
  30 {
  31         struct sockaddr_in sock;
  32         int val=1;
  33         int res;
  34
  35         memset((char *)&sock,'\0',sizeof(sock));
  36
  37 #ifdef HAVE_SOCK_SIN_LEN
  38         sock.sin_len = sizeof(sock);
  39 #endif
  40         sock.sin_port = 0;
  41         sock.sin_family = AF_INET;
  42         sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
  43         res = socket(AF_INET, SOCK_DGRAM, 0);
  44         if (res == -1)
  45                 return -1;
  46
  47         setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
  48 #ifdef SO_REUSEPORT
  49         setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
  50 #endif /* SO_REUSEPORT */
  51
  52         /* now we've got a socket - we need to bind it */
  53
  54         if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
  55                 close(res);
  56                 return(-1);
  57         }
  58
  59         set_socket_options(res,"SO_BROADCAST");
  60
  61         return res;
  62 }
  63
  64
  65 static struct node_status *lookup_byaddr_backend(char *addr, int *count)
  66 {
  67         int fd;
  68         struct in_addr  ip;
  69         struct nmb_name nname;
  70         struct node_status *status;
  71
  72         fd = wins_lookup_open_socket_in();
  73         if (fd == -1)
  74                 return NULL;
  75
  76         make_nmb_name(&nname, "*", 0);
  77         ip = *interpret_addr2(addr);
  78         status = node_status_query(fd,&nname,ip, count);
  79
  80         close(fd);
  81         return status;
  82 }
  83
  84 static struct in_addr *lookup_byname_backend(const char *name, int *count)
  85 {
  86         int fd;
  87         struct in_addr *ret = NULL;
  88         struct in_addr  p;
  89         int j;
  90
  91         *count = 0;
  92
  93         fd = wins_lookup_open_socket_in();
  94         if (fd == -1)
  95                 return NULL;
  96
  97         p = wins_srv_ip();
  98         if( !zero_ip(p) ) {
  99                 ret = name_query(fd,name,0x20,False,True, p, count);
 100                 goto out;
 101         }
 102
 103         if (lp_wins_support()) {
 104                 /* we are our own WINS server */
 105                 ret = name_query(fd,name,0x20,False,True, *interpret_addr2("127.0.0.1"), count);
 106                 goto out;
 107         }
 108
 109         /* uggh, we have to broadcast to each interface in turn */
 110         for (j=iface_count() - 1;
 111              j >= 0;
 112              j--) {
 113                 struct in_addr *bcast = iface_n_bcast(j);
 114                 ret = name_query(fd,name,0x20,True,True,*bcast,count);
 115                 if (ret) break;
 116         }
 117
 118  out:
 119
 120         close(fd);
 121         return ret;
 122 }
 123
 124 /* Get hostname from IP  */
 125
 126 enum winbindd_result winbindd_wins_byip(struct winbindd_cli_state *state)
 127 {
 128         char response[1024];
 129         int i, count, len, size, maxsize;
 130         struct node_status *status;
 131
 132         DEBUG(3, ("[%5d]: wins_byip %s\n", state->pid,
 133                 state->request.data.name));
 134
 135         *response = '\0';
 136         maxsize = len = sizeof(response) - 1;
 137
 138         if ((status = lookup_byaddr_backend(state->request.data.name, &count))){
 139             size = strlen(state->request.data.name) + 1;
 140             if (size > len) {
 141                 SAFE_FREE(status);
 142                 return WINBINDD_ERROR;
 143             }
 144             len -= size;
 145             safe_strcat(response,state->request.data.name,maxsize);
 146             safe_strcat(response,"\t",maxsize);
 147             for (i = 0; i < count; i++) {
 148                 /* ignore group names */
 149                 if (status[i].flags & 0x80) continue;
 150                 if (status[i].type == 0x20) {
 151                         size = sizeof(status[i].name) + 1;
 152                         if (size > len) {
 153                             SAFE_FREE(status);
 154                             return WINBINDD_ERROR;
 155                         }
 156                         len -= size;
 157                         safe_strcat(response, status[i].name, maxsize);
 158                         safe_strcat(response, " ", maxsize);
 159                 }
 160             }
 161             SAFE_FREE(status);
 162         }
 163         fstrcpy(state->response.data.name.name,response);
 164         return WINBINDD_OK;
 165 }
 166
 167 /* Get IP from hostname */
 168
 169 enum winbindd_result winbindd_wins_byname(struct winbindd_cli_state *state)
 170 {
 171         struct in_addr *ip_list;
 172         int i, count, len, size, maxsize;
 173         char response[1024];
 174         char * addr;
 175
 176         DEBUG(3, ("[%5d]: wins_byname %s\n", state->pid,
 177                 state->request.data.name));
 178
 179         *response = '\0';
 180         maxsize = len = sizeof(response) - 1;
 181
 182         if ((ip_list = lookup_byname_backend(state->request.data.name,&count))){
 183                 for (i = count; i ; i--) {
 184                     addr = inet_ntoa(ip_list[i-1]);
 185                     size = strlen(addr) + 1;
 186                     if (size > len) {
 187                         SAFE_FREE(ip_list);
 188                         return WINBINDD_ERROR;
 189                     }
 190                     len -= size;
 191                     safe_strcat(response,addr,maxsize);
 192                     safe_strcat(response," ",maxsize);
 193                 }
 194                 size = strlen(state->request.data.name) + 1;
 195                 if (size > len) {
 196                     SAFE_FREE(ip_list);
 197                     return WINBINDD_ERROR;
 198                 }
 199                 response[strlen(response)-1] = '\t';
 200                 safe_strcat(response,state->request.data.name,maxsize);
 201                 SAFE_FREE(ip_list);
 202         } else
 203                 return WINBINDD_ERROR;
 204
 205         fstrcpy(state->response.data.name.name,response);
 206
 207         return WINBINDD_OK;
 208 }