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 "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, NULL);
  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 = NULL;
  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 = SMB_MALLOC_ARRAY(struct in_addr, *count)) == 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                 free( ret );
 110                 return return_ip;
 111         }
 112
 113         fd = wins_lookup_open_socket_in();
 114         if (fd == -1) {
 115                 return NULL;
 116         }
 117
 118         /* uggh, we have to broadcast to each interface in turn */
 119         for (j=iface_count() - 1;
 120              j >= 0;
 121              j--) {
 122                 struct in_addr *bcast = iface_n_bcast(j);
 123                 return_ip = name_query(fd,name,0x20,True,True,*bcast,count, &flags, NULL);
 124                 if (return_ip) {
 125                         break;
 126                 }
 127         }
 128
 129         close(fd);
 130         return return_ip;
 131 }
 132
 133 /* Get hostname from IP  */
 134
 135 enum winbindd_result winbindd_wins_byip(struct winbindd_cli_state *state)
 136 {
 137         fstring response;
 138         int i, count, maxlen, size;
 139         struct node_status *status;
 140
 141         /* Ensure null termination */
 142         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 143
 144         DEBUG(3, ("[%5lu]: wins_byip %s\n", (unsigned long)state->pid,
 145                 state->request.data.winsreq));
 146
 147         *response = '\0';
 148         maxlen = sizeof(response) - 1;
 149
 150         if ((status = lookup_byaddr_backend(state->request.data.winsreq, &count))){
 151             size = strlen(state->request.data.winsreq);
 152             if (size > maxlen) {
 153                 SAFE_FREE(status);
 154                 return WINBINDD_ERROR;
 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                             return WINBINDD_ERROR;
 166                         }
 167                         fstrcat(response, status[i].name);
 168                         fstrcat(response, " ");
 169                 }
 170             }
 171             /* make last character a newline */
 172             response[strlen(response)-1] = '\n';
 173             SAFE_FREE(status);
 174         }
 175         fstrcpy(state->response.data.winsresp,response);
 176         return WINBINDD_OK;
 177 }
 178
 179 /* Get IP from hostname */
 180
 181 enum winbindd_result winbindd_wins_byname(struct winbindd_cli_state *state)
 182 {
 183         struct in_addr *ip_list;
 184         int i, count, maxlen, size;
 185         fstring response;
 186         char * addr;
 187
 188         /* Ensure null termination */
 189         state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';
 190
 191         DEBUG(3, ("[%5lu]: wins_byname %s\n", (unsigned long)state->pid,
 192                 state->request.data.winsreq));
 193
 194         *response = '\0';
 195         maxlen = sizeof(response) - 1;
 196
 197         if ((ip_list = lookup_byname_backend(state->request.data.winsreq,&count))){
 198                 for (i = count; i ; i--) {
 199                     addr = inet_ntoa(ip_list[i-1]);
 200                     size = strlen(addr);
 201                     if (size > maxlen) {
 202                         SAFE_FREE(ip_list);
 203                         return WINBINDD_ERROR;
 204                     }
 205                     if (i != 0) {
 206                         /* Clear out the newline character */
 207                         /* But only if there is something in there,
 208                            otherwise we clobber something in the stack */
 209                         if (strlen(response))
 210                                 response[strlen(response)-1] = ' ';
 211                     }
 212                     fstrcat(response,addr);
 213                     fstrcat(response,"\t");
 214                 }
 215                 size = strlen(state->request.data.winsreq) + strlen(response);
 216                 if (size > maxlen) {
 217                     SAFE_FREE(ip_list);
 218                     return WINBINDD_ERROR;
 219                 }
 220                 fstrcat(response,state->request.data.winsreq);
 221                 fstrcat(response,"\n");
 222                 SAFE_FREE(ip_list);
 223         } else
 224                 return WINBINDD_ERROR;
 225
 226         fstrcpy(state->response.data.winsresp,response);
 227
 228         return WINBINDD_OK;
 229 }