source3/winbindd/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 (NT_STATUS_IS_OK(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                 const struct in_addr *bcast = iface_n_bcast_v4(j);
 122                 if (!bcast) {
 123                         continue;
 124                 }
 125                 return_ip = name_query(fd,name,0x20,True,True,*bcast,count, &flags, NULL);
 126                 if (return_ip) {
 127                         break;
 128                 }
 129         }
 130
 131         close(fd);
 132         return return_ip;
 133 }
 134
 135 /* Get hostname from IP  */
 136
 137 void winbindd_wins_byip(struct winbindd_cli_state *state)
 138 {
 139         fstring response;
 140         int i, count, maxlen, size;
 141         NODE_STATUS_STRUCT *status;
 142
 143         /* Ensure null termination */
 144         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 145
 146         DEBUG(3, ("[%5lu]: wins_byip %s\n", (unsigned long)state->pid,
 147                 state->request.data.winsreq));
 148
 149         *response = '\0';
 150         maxlen = sizeof(response) - 1;
 151
 152         if ((status = lookup_byaddr_backend(state->request.data.winsreq, &count))){
 153             size = strlen(state->request.data.winsreq);
 154             if (size > maxlen) {
 155                 SAFE_FREE(status);
 156                 request_error(state);
 157                 return;
 158             }
 159             fstrcat(response,state->request.data.winsreq);
 160             fstrcat(response,"\t");
 161             for (i = 0; i < count; i++) {
 162                 /* ignore group names */
 163                 if (status[i].flags & 0x80) continue;
 164                 if (status[i].type == 0x20) {
 165                         size = sizeof(status[i].name) + strlen(response);
 166                         if (size > maxlen) {
 167                             SAFE_FREE(status);
 168                             request_error(state);
 169                             return;
 170                         }
 171                         fstrcat(response, status[i].name);
 172                         fstrcat(response, " ");
 173                 }
 174             }
 175             /* make last character a newline */
 176             response[strlen(response)-1] = '\n';
 177             SAFE_FREE(status);
 178         }
 179         fstrcpy(state->response.data.winsresp,response);
 180         request_ok(state);
 181 }
 182
 183 /* Get IP from hostname */
 184
 185 void winbindd_wins_byname(struct winbindd_cli_state *state)
 186 {
 187         struct in_addr *ip_list;
 188         int i, count, maxlen, size;
 189         fstring response;
 190         char * addr;
 191
 192         /* Ensure null termination */
 193         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 194
 195         DEBUG(3, ("[%5lu]: wins_byname %s\n", (unsigned long)state->pid,
 196                 state->request.data.winsreq));
 197
 198         *response = '\0';
 199         maxlen = sizeof(response) - 1;
 200
 201         if ((ip_list = lookup_byname_backend(state->request.data.winsreq,&count))){
 202                 for (i = count; i ; i--) {
 203                     addr = inet_ntoa(ip_list[i-1]);
 204                     size = strlen(addr);
 205                     if (size > maxlen) {
 206                         SAFE_FREE(ip_list);
 207                         request_error(state);
 208                         return;
 209                     }
 210                     if (i != 0) {
 211                         /* Clear out the newline character */
 212                         /* But only if there is something in there,
 213                            otherwise we clobber something in the stack */
 214                         if (strlen(response))
 215                                 response[strlen(response)-1] = ' ';
 216                     }
 217                     fstrcat(response,addr);
 218                     fstrcat(response,"\t");
 219                 }
 220                 size = strlen(state->request.data.winsreq) + strlen(response);
 221                 if (size > maxlen) {
 222                     SAFE_FREE(ip_list);
 223                     request_error(state);
 224                     return;
 225                 }
 226                 fstrcat(response,state->request.data.winsreq);
 227                 fstrcat(response,"\n");
 228                 SAFE_FREE(ip_list);
 229         } else {
 230                 request_error(state);
 231                 return;
 232         }
 233
 234         fstrcpy(state->response.data.winsresp,response);
 235
 236         request_ok(state);
 237 }