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 3 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, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  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 NODE_STATUS_STRUCT *lookup_byaddr_backend(char *addr, int *count)
  68 {
  69         int fd;
  70         struct in_addr  ip;
  71         struct nmb_name nname;
  72         NODE_STATUS_STRUCT *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, NULL);
  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 ip_service *ret = NULL;
  90         struct in_addr *return_ip = NULL;
  91         int j, i, flags = 0;
  92
  93         *count = 0;
  94
  95         /* always try with wins first */
  96         if (resolve_wins(name,0x20,&ret,count)) {
  97                 if ( *count == 0 )
  98                         return NULL;
  99                 if ( (return_ip = SMB_MALLOC_ARRAY(struct in_addr, *count)) == NULL ) {
 100                         free( ret );
 101                         return NULL;
 102                 }
 103
 104                 /* copy the IP addresses */
 105                 for ( i=0; i<(*count); i++ )
 106                         return_ip[i] = ret[i].ip;
 107
 108                 free( ret );
 109                 return return_ip;
 110         }
 111
 112         fd = wins_lookup_open_socket_in();
 113         if (fd == -1) {
 114                 return NULL;
 115         }
 116
 117         /* uggh, we have to broadcast to each interface in turn */
 118         for (j=iface_count() - 1;
 119              j >= 0;
 120              j--) {
 121                 struct in_addr *bcast = iface_n_bcast(j);
 122                 return_ip = name_query(fd,name,0x20,True,True,*bcast,count, &flags, NULL);
 123                 if (return_ip) {
 124                         break;
 125                 }
 126         }
 127
 128         close(fd);
 129         return return_ip;
 130 }
 131
 132 /* Get hostname from IP  */
 133
 134 void winbindd_wins_byip(struct winbindd_cli_state *state)
 135 {
 136         fstring response;
 137         int i, count, maxlen, size;
 138         NODE_STATUS_STRUCT *status;
 139
 140         /* Ensure null termination */
 141         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 142
 143         DEBUG(3, ("[%5lu]: wins_byip %s\n", (unsigned long)state->pid,
 144                 state->request.data.winsreq));
 145
 146         *response = '\0';
 147         maxlen = sizeof(response) - 1;
 148
 149         if ((status = lookup_byaddr_backend(state->request.data.winsreq, &count))){
 150             size = strlen(state->request.data.winsreq);
 151             if (size > maxlen) {
 152                 SAFE_FREE(status);
 153                 request_error(state);
 154                 return;
 155             }
 156             fstrcat(response,state->request.data.winsreq);
 157             fstrcat(response,"\t");
 158             for (i = 0; i < count; i++) {
 159                 /* ignore group names */
 160                 if (status[i].flags & 0x80) continue;
 161                 if (status[i].type == 0x20) {
 162                         size = sizeof(status[i].name) + strlen(response);
 163                         if (size > maxlen) {
 164                             SAFE_FREE(status);
 165                             request_error(state);
 166                             return;
 167                         }
 168                         fstrcat(response, status[i].name);
 169                         fstrcat(response, " ");
 170                 }
 171             }
 172             /* make last character a newline */
 173             response[strlen(response)-1] = '\n';
 174             SAFE_FREE(status);
 175         }
 176         fstrcpy(state->response.data.winsresp,response);
 177         request_ok(state);
 178 }
 179
 180 /* Get IP from hostname */
 181
 182 void winbindd_wins_byname(struct winbindd_cli_state *state)
 183 {
 184         struct in_addr *ip_list;
 185         int i, count, maxlen, size;
 186         fstring response;
 187         char * addr;
 188
 189         /* Ensure null termination */
 190         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 191
 192         DEBUG(3, ("[%5lu]: wins_byname %s\n", (unsigned long)state->pid,
 193                 state->request.data.winsreq));
 194
 195         *response = '\0';
 196         maxlen = sizeof(response) - 1;
 197
 198         if ((ip_list = lookup_byname_backend(state->request.data.winsreq,&count))){
 199                 for (i = count; i ; i--) {
 200                     addr = inet_ntoa(ip_list[i-1]);
 201                     size = strlen(addr);
 202                     if (size > maxlen) {
 203                         SAFE_FREE(ip_list);
 204                         request_error(state);
 205                         return;
 206                     }
 207                     if (i != 0) {
 208                         /* Clear out the newline character */
 209                         /* But only if there is something in there,
 210                            otherwise we clobber something in the stack */
 211                         if (strlen(response))
 212                                 response[strlen(response)-1] = ' ';
 213                     }
 214                     fstrcat(response,addr);
 215                     fstrcat(response,"\t");
 216                 }
 217                 size = strlen(state->request.data.winsreq) + strlen(response);
 218                 if (size > maxlen) {
 219                     SAFE_FREE(ip_list);
 220                     request_error(state);
 221                     return;
 222                 }
 223                 fstrcat(response,state->request.data.winsreq);
 224                 fstrcat(response,"\n");
 225                 SAFE_FREE(ip_list);
 226         } else {
 227                 request_error(state);
 228                 return;
 229         }
 230
 231         fstrcpy(state->response.data.winsresp,response);
 232
 233         request_ok(state);
 234 }