source/nsswitch/winbindd_wins.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon - WINS related functions
   5
   6    Copyright (C) Andrew Tridgell 1999
   7    Copyright (C) Herb Lewis 2002
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "winbindd.h"
  25
  26 /* Use our own create socket code so we don't recurse.... */
  27
  28 static int wins_lookup_open_socket_in(void)
  29 {
  30         struct sockaddr_in sock;
  31         int val=1;
  32         int res;
  33
  34         memset((char *)&sock,'\0',sizeof(sock));
  35
  36 #ifdef HAVE_SOCK_SIN_LEN
  37         sock.sin_len = sizeof(sock);
  38 #endif
  39         sock.sin_port = 0;
  40         sock.sin_family = AF_INET;
  41         sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
  42         res = socket(AF_INET, SOCK_DGRAM, 0);
  43         if (res == -1)
  44                 return -1;
  45
  46         setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
  47 #ifdef SO_REUSEPORT
  48         setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
  49 #endif /* SO_REUSEPORT */
  50
  51         /* now we've got a socket - we need to bind it */
  52
  53         if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
  54                 close(res);
  55                 return(-1);
  56         }
  57
  58         set_socket_options(res,"SO_BROADCAST");
  59
  60         return res;
  61 }
  62
  63
  64 static struct node_status *lookup_byaddr_backend(char *addr, int *count)
  65 {
  66         int fd;
  67         struct in_addr  ip;
  68         struct nmb_name nname;
  69         struct node_status *status;
  70
  71         fd = wins_lookup_open_socket_in();
  72         if (fd == -1)
  73                 return NULL;
  74
  75         make_nmb_name(&nname, "*", 0);
  76         ip = *interpret_addr2(addr);
  77         status = node_status_query(fd,&nname,ip, count);
  78
  79         close(fd);
  80         return status;
  81 }
  82
  83 static struct in_addr *lookup_byname_backend(const char *name, int *count)
  84 {
  85         int fd;
  86         struct in_addr *ret = NULL;
  87         struct in_addr  p;
  88         int j, flags;
  89
  90         *count = 0;
  91
  92         fd = wins_lookup_open_socket_in();
  93         if (fd == -1)
  94                 return NULL;
  95
  96         p = wins_srv_ip();
  97         if( !is_zero_ip(p) ) {
  98                 ret = name_query(fd,name,0x20,False,True, p, count, &flags);
  99                 goto out;
 100         }
 101
 102         if (lp_wins_support()) {
 103                 /* we are our own WINS server */
 104                 ret = name_query(fd,name,0x20,False,True, *interpret_addr2("127.0.0.1"), count, &flags);
 105                 goto out;
 106         }
 107
 108         /* uggh, we have to broadcast to each interface in turn */
 109         for (j=iface_count() - 1;
 110              j >= 0;
 111              j--) {
 112                 struct in_addr *bcast = iface_n_bcast(j);
 113                 ret = name_query(fd,name,0x20,True,True,*bcast,count, &flags);
 114                 if (ret) break;
 115         }
 116
 117  out:
 118
 119         close(fd);
 120         return ret;
 121 }
 122
 123 /* Get hostname from IP  */
 124
 125 enum winbindd_result winbindd_wins_byip(struct winbindd_cli_state *state)
 126 {
 127         fstring response;
 128         int i, count, maxlen, size;
 129         struct node_status *status;
 130
 131         DEBUG(3, ("[%5d]: wins_byip %s\n", state->pid,
 132                 state->request.data.winsreq));
 133
 134         *response = '\0';
 135         maxlen = sizeof(response) - 1;
 136
 137         if ((status = lookup_byaddr_backend(state->request.data.winsreq, &count))){
 138             size = strlen(state->request.data.winsreq);
 139             if (size > maxlen) {
 140                 SAFE_FREE(status);
 141                 return WINBINDD_ERROR;
 142             }
 143             safe_strcat(response,state->request.data.winsreq,maxlen);
 144             safe_strcat(response,"\t",maxlen);
 145             for (i = 0; i < count; i++) {
 146                 /* ignore group names */
 147                 if (status[i].flags & 0x80) continue;
 148                 if (status[i].type == 0x20) {
 149                         size = sizeof(status[i].name) + strlen(response);
 150                         if (size > maxlen) {
 151                             SAFE_FREE(status);
 152                             return WINBINDD_ERROR;
 153                         }
 154                         safe_strcat(response, status[i].name, maxlen);
 155                         safe_strcat(response, " ", maxlen);
 156                 }
 157             }
 158             /* make last character a newline */
 159             response[strlen(response)-1] = '\n';
 160             SAFE_FREE(status);
 161         }
 162         fstrcpy(state->response.data.winsresp,response);
 163         return WINBINDD_OK;
 164 }
 165
 166 /* Get IP from hostname */
 167
 168 enum winbindd_result winbindd_wins_byname(struct winbindd_cli_state *state)
 169 {
 170         struct in_addr *ip_list;
 171         int i, count, maxlen, size;
 172         fstring response;
 173         char * addr;
 174
 175         DEBUG(3, ("[%5d]: wins_byname %s\n", state->pid,
 176                 state->request.data.winsreq));
 177
 178         *response = '\0';
 179         maxlen = sizeof(response) - 1;
 180
 181         if ((ip_list = lookup_byname_backend(state->request.data.winsreq,&count))){
 182                 for (i = count; i ; i--) {
 183                     addr = inet_ntoa(ip_list[i-1]);
 184                     size = strlen(addr);
 185                     if (size > maxlen) {
 186                         SAFE_FREE(ip_list);
 187                         return WINBINDD_ERROR;
 188                     }
 189                     if (i != 0) {
 190                         /* Clear out the newline character */
 191                         response[strlen(response)-1] = ' ';
 192                     }
 193                     safe_strcat(response,addr,maxlen);
 194                     safe_strcat(response,"\t",maxlen);
 195                 }
 196                 size = strlen(state->request.data.winsreq) + strlen(response);
 197                 if (size > maxlen) {
 198                     SAFE_FREE(ip_list);
 199                     return WINBINDD_ERROR;
 200                 }
 201                 safe_strcat(response,state->request.data.winsreq,maxlen);
 202                 safe_strcat(response,"\n",maxlen);
 203                 SAFE_FREE(ip_list);
 204         } else
 205                 return WINBINDD_ERROR;
 206
 207         fstrcpy(state->response.data.winsresp,response);
 208
 209         return WINBINDD_OK;
 210 }