source3/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 "includes.h"
  25 #include "winbindd.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_WINBIND
  29
  30 /* Use our own create socket code so we don't recurse.... */
  31
  32 static int wins_lookup_open_socket_in(void)
  33 {
  34         struct sockaddr_in sock;
  35         int val=1;
  36         int res;
  37
  38         memset((char *)&sock,'\0',sizeof(sock));
  39
  40 #ifdef HAVE_SOCK_SIN_LEN
  41         sock.sin_len = sizeof(sock);
  42 #endif
  43         sock.sin_port = 0;
  44         sock.sin_family = AF_INET;
  45         sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
  46         res = socket(AF_INET, SOCK_DGRAM, 0);
  47         if (res == -1)
  48                 return -1;
  49
  50         setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
  51 #ifdef SO_REUSEPORT
  52         setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
  53 #endif /* SO_REUSEPORT */
  54
  55         /* now we've got a socket - we need to bind it */
  56
  57         if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
  58                 close(res);
  59                 return(-1);
  60         }
  61
  62         set_socket_options(res,"SO_BROADCAST");
  63
  64         return res;
  65 }
  66
  67
  68 static struct node_status *lookup_byaddr_backend(char *addr, int *count)
  69 {
  70         int fd;
  71         struct in_addr  ip;
  72         struct nmb_name nname;
  73         struct node_status *status;
  74
  75         fd = wins_lookup_open_socket_in();
  76         if (fd == -1)
  77                 return NULL;
  78
  79         make_nmb_name(&nname, "*", 0);
  80         ip = *interpret_addr2(addr);
  81         status = node_status_query(fd,&nname,ip, count);
  82
  83         close(fd);
  84         return status;
  85 }
  86
  87 static struct in_addr *lookup_byname_backend(const char *name, int *count)
  88 {
  89         int fd;
  90         struct ip_service *ret = NULL;
  91         struct in_addr *return_ip;
  92         int j, i, flags = 0;
  93
  94         *count = 0;
  95
  96         /* always try with wins first */
  97         if (resolve_wins(name,0x20,&ret,count)) {
  98                 if ( count == 0 )
  99                         return NULL;
 100                 if ( (return_ip = (struct in_addr *)malloc((*count)*sizeof(struct in_addr))) == NULL ) {
 101                         free( ret );
 102                         return NULL;
 103                 }
 104
 105                 /* copy the IP addresses */
 106                 for ( i=0; i<(*count); i++ )
 107                         return_ip[i] = ret[i].ip;
 108
 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) break;
 124         }
 125
 126         close(fd);
 127         return return_ip;
 128 }
 129
 130 /* Get hostname from IP  */
 131
 132 enum winbindd_result winbindd_wins_byip(struct winbindd_cli_state *state)
 133 {
 134         fstring response;
 135         int i, count, maxlen, size;
 136         struct node_status *status;
 137
 138         /* Ensure null termination */
 139         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 140
 141         DEBUG(3, ("[%5lu]: wins_byip %s\n", (unsigned long)state->pid,
 142                 state->request.data.winsreq));
 143
 144         *response = '\0';
 145         maxlen = sizeof(response) - 1;
 146
 147         if ((status = lookup_byaddr_backend(state->request.data.winsreq, &count))){
 148             size = strlen(state->request.data.winsreq);
 149             if (size > maxlen) {
 150                 SAFE_FREE(status);
 151                 return WINBINDD_ERROR;
 152             }
 153             fstrcat(response,state->request.data.winsreq);
 154             fstrcat(response,"\t");
 155             for (i = 0; i < count; i++) {
 156                 /* ignore group names */
 157                 if (status[i].flags & 0x80) continue;
 158                 if (status[i].type == 0x20) {
 159                         size = sizeof(status[i].name) + strlen(response);
 160                         if (size > maxlen) {
 161                             SAFE_FREE(status);
 162                             return WINBINDD_ERROR;
 163                         }
 164                         fstrcat(response, status[i].name);
 165                         fstrcat(response, " ");
 166                 }
 167             }
 168             /* make last character a newline */
 169             response[strlen(response)-1] = '\n';
 170             SAFE_FREE(status);
 171         }
 172         fstrcpy(state->response.data.winsresp,response);
 173         return WINBINDD_OK;
 174 }
 175
 176 /* Get IP from hostname */
 177
 178 enum winbindd_result winbindd_wins_byname(struct winbindd_cli_state *state)
 179 {
 180         struct in_addr *ip_list;
 181         int i, count, maxlen, size;
 182         fstring response;
 183         char * addr;
 184
 185         /* Ensure null termination */
 186         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 187
 188         DEBUG(3, ("[%5lu]: wins_byname %s\n", (unsigned long)state->pid,
 189                 state->request.data.winsreq));
 190
 191         *response = '\0';
 192         maxlen = sizeof(response) - 1;
 193
 194         if ((ip_list = lookup_byname_backend(state->request.data.winsreq,&count))){
 195                 for (i = count; i ; i--) {
 196                     addr = inet_ntoa(ip_list[i-1]);
 197                     size = strlen(addr);
 198                     if (size > maxlen) {
 199                         SAFE_FREE(ip_list);
 200                         return WINBINDD_ERROR;
 201                     }
 202                     if (i != 0) {
 203                         /* Clear out the newline character */
 204                         /* But only if there is something in there,
 205                            otherwise we clobber something in the stack */
 206                         if (strlen(response))
 207                                 response[strlen(response)-1] = ' ';
 208                     }
 209                     fstrcat(response,addr);
 210                     fstrcat(response,"\t");
 211                 }
 212                 size = strlen(state->request.data.winsreq) + strlen(response);
 213                 if (size > maxlen) {
 214                     SAFE_FREE(ip_list);
 215                     return WINBINDD_ERROR;
 216                 }
 217                 fstrcat(response,state->request.data.winsreq);
 218                 fstrcat(response,"\n");
 219                 SAFE_FREE(ip_list);
 220         } else
 221                 return WINBINDD_ERROR;
 222
 223         fstrcpy(state->response.data.winsresp,response);
 224
 225         return WINBINDD_OK;
 226 }