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 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_WINBIND
  28
  29 /* Use our own create socket code so we don't recurse.... */
  30
  31 static int wins_lookup_open_socket_in(void)
  32 {
  33         struct sockaddr_in sock;
  34         int val=1;
  35         int res;
  36
  37         memset((char *)&sock,'\0',sizeof(sock));
  38
  39 #ifdef HAVE_SOCK_SIN_LEN
  40         sock.sin_len = sizeof(sock);
  41 #endif
  42         sock.sin_port = 0;
  43         sock.sin_family = AF_INET;
  44         sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
  45         res = socket(AF_INET, SOCK_DGRAM, 0);
  46         if (res == -1)
  47                 return -1;
  48
  49         setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
  50 #ifdef SO_REUSEPORT
  51         setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
  52 #endif /* SO_REUSEPORT */
  53
  54         /* now we've got a socket - we need to bind it */
  55
  56         if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
  57                 close(res);
  58                 return(-1);
  59         }
  60
  61         set_socket_options(res,"SO_BROADCAST");
  62
  63         return res;
  64 }
  65
  66
  67 static struct node_status *lookup_byaddr_backend(char *addr, int *count)
  68 {
  69         int fd;
  70         struct in_addr  ip;
  71         struct nmb_name nname;
  72         struct node_status *status;
  73
  74         fd = wins_lookup_open_socket_in();
  75         if (fd == -1)
  76                 return NULL;
  77
  78         make_nmb_name(&nname, "*", 0);
  79         ip = *interpret_addr2(addr);
  80         status = node_status_query(fd,&nname,ip, count);
  81
  82         close(fd);
  83         return status;
  84 }
  85
  86 static struct in_addr *lookup_byname_backend(const char *name, int *count)
  87 {
  88         int fd;
  89         struct in_addr *ret = NULL;
  90         int j, flags = 0;
  91
  92         *count = 0;
  93
  94         /* always try with wins first */
  95         if (resolve_wins(name,0x20,&ret,count)) {
  96                 return ret;
  97         }
  98
  99         fd = wins_lookup_open_socket_in();
 100         if (fd == -1) {
 101                 return NULL;
 102         }
 103
 104         /* uggh, we have to broadcast to each interface in turn */
 105         for (j=iface_count() - 1;
 106              j >= 0;
 107              j--) {
 108                 struct in_addr *bcast = iface_n_bcast(j);
 109                 ret = name_query(fd,name,0x20,True,True,*bcast,count, &flags, NULL);
 110                 if (ret) break;
 111         }
 112
 113         close(fd);
 114         return ret;
 115 }
 116
 117 /* Get hostname from IP  */
 118
 119 enum winbindd_result winbindd_wins_byip(struct winbindd_cli_state *state)
 120 {
 121         fstring response;
 122         int i, count, maxlen, size;
 123         struct node_status *status;
 124
 125         /* Ensure null termination */
 126         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 127
 128         DEBUG(3, ("[%5d]: wins_byip %s\n", state->pid,
 129                 state->request.data.winsreq));
 130
 131         *response = '\0';
 132         maxlen = sizeof(response) - 1;
 133
 134         if ((status = lookup_byaddr_backend(state->request.data.winsreq, &count))){
 135             size = strlen(state->request.data.winsreq);
 136             if (size > maxlen) {
 137                 SAFE_FREE(status);
 138                 return WINBINDD_ERROR;
 139             }
 140             safe_strcat(response,state->request.data.winsreq,maxlen);
 141             safe_strcat(response,"\t",maxlen);
 142             for (i = 0; i < count; i++) {
 143                 /* ignore group names */
 144                 if (status[i].flags & 0x80) continue;
 145                 if (status[i].type == 0x20) {
 146                         size = sizeof(status[i].name) + strlen(response);
 147                         if (size > maxlen) {
 148                             SAFE_FREE(status);
 149                             return WINBINDD_ERROR;
 150                         }
 151                         safe_strcat(response, status[i].name, maxlen);
 152                         safe_strcat(response, " ", maxlen);
 153                 }
 154             }
 155             /* make last character a newline */
 156             response[strlen(response)-1] = '\n';
 157             SAFE_FREE(status);
 158         }
 159         fstrcpy(state->response.data.winsresp,response);
 160         return WINBINDD_OK;
 161 }
 162
 163 /* Get IP from hostname */
 164
 165 enum winbindd_result winbindd_wins_byname(struct winbindd_cli_state *state)
 166 {
 167         struct in_addr *ip_list;
 168         int i, count, maxlen, size;
 169         fstring response;
 170         char * addr;
 171
 172         /* Ensure null termination */
 173         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 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 }