source4/nsswitch/wins.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    a WINS nsswitch module
   4    Copyright (C) Andrew Tridgell 1999
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20 */
  21
  22 #include "includes.h"
  23 #ifdef HAVE_NS_API_H
  24 #undef VOLATILE
  25
  26 #include <ns_daemon.h>
  27 #endif
  28
  29 #ifndef INADDRSZ
  30 #define INADDRSZ 4
  31 #endif
  32
  33 static int initialised;
  34
  35 extern BOOL AllowDebugChange;
  36
  37 /* Use our own create socket code so we don't recurse.... */
  38
  39 static int wins_lookup_open_socket_in(void)
  40 {
  41         struct sockaddr_in sock;
  42         int val=1;
  43         int res;
  44
  45         memset((char *)&sock,'\0',sizeof(sock));
  46
  47 #ifdef HAVE_SOCK_SIN_LEN
  48         sock.sin_len = sizeof(sock);
  49 #endif
  50         sock.sin_port = 0;
  51         sock.sin_family = AF_INET;
  52         sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
  53         res = socket(AF_INET, SOCK_DGRAM, 0);
  54         if (res == -1)
  55                 return -1;
  56
  57         setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
  58 #ifdef SO_REUSEPORT
  59         setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
  60 #endif /* SO_REUSEPORT */
  61
  62         /* now we've got a socket - we need to bind it */
  63
  64         if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
  65                 close(res);
  66                 return(-1);
  67         }
  68
  69         set_socket_options(res,"SO_BROADCAST");
  70
  71         return res;
  72 }
  73
  74
  75 static void nss_wins_init(void)
  76 {
  77         initialised = 1;
  78         DEBUGLEVEL = 0;
  79         AllowDebugChange = False;
  80
  81         TimeInit();
  82         setup_logging("nss_wins",DEBUG_FILE);
  83         lp_load(dyn_CONFIGFILE,True,False,False);
  84         load_interfaces();
  85 }
  86
  87 static struct node_status *lookup_byaddr_backend(char *addr, int *count)
  88 {
  89         int fd;
  90         struct in_addr  ip;
  91         struct nmb_name nname;
  92         struct node_status *status;
  93
  94         if (!initialised) {
  95                 nss_wins_init();
  96         }
  97
  98         fd = wins_lookup_open_socket_in();
  99         if (fd == -1)
 100                 return NULL;
 101
 102         make_nmb_name(&nname, "*", 0);
 103         ip = *interpret_addr2(addr);
 104         status = node_status_query(fd,&nname,ip, count);
 105
 106         close(fd);
 107         return status;
 108 }
 109
 110 static struct in_addr *lookup_byname_backend(const char *name, int *count)
 111 {
 112         int fd = -1;
 113         struct in_addr *ret = NULL;
 114         struct in_addr  p;
 115         int j, flags = 0;
 116
 117         if (!initialised) {
 118                 nss_wins_init();
 119         }
 120
 121         *count = 0;
 122
 123         /* always try with wins first */
 124         if (resolve_wins(name,0x20,&ret,count)) {
 125                 return ret;
 126         }
 127
 128         fd = wins_lookup_open_socket_in();
 129         if (fd == -1) {
 130                 return NULL;
 131         }
 132
 133         /* uggh, we have to broadcast to each interface in turn */
 134         for (j=iface_count() - 1;j >= 0;j--) {
 135                 struct in_addr *bcast = iface_n_bcast(j);
 136                 ret = name_query(fd,name,0x20,True,True,*bcast,count, &flags, NULL);
 137                 if (ret) break;
 138         }
 139
 140 out:
 141         close(fd);
 142         return ret;
 143 }
 144
 145
 146 #ifdef HAVE_NS_API_H
 147 /* IRIX version */
 148
 149 int init(void)
 150 {
 151         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
 152         nss_wins_init();
 153         return NSD_OK;
 154 }
 155
 156 int lookup(nsd_file_t *rq)
 157 {
 158         char *map;
 159         char *key;
 160         char *addr;
 161         struct in_addr *ip_list;
 162         struct node_status *status;
 163         int i, count, len, size;
 164         char response[1024];
 165         BOOL found = False;
 166
 167         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 168         if (! rq)
 169                 return NSD_ERROR;
 170
 171         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 172         if (! map) {
 173                 rq->f_status = NS_FATAL;
 174                 return NSD_ERROR;
 175         }
 176
 177         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 178         if (! key || ! *key) {
 179                 rq->f_status = NS_FATAL;
 180                 return NSD_ERROR;
 181         }
 182
 183         response[0] = '\0';
 184         len = sizeof(response) - 2;
 185
 186         /*
 187          * response needs to be a string of the following format
 188          * ip_address[ ip_address]*\tname[ alias]*
 189          */
 190         if (strcasecmp(map,"hosts.byaddr") == 0) {
 191                 if ( status = lookup_byaddr_backend(key, &count)) {
 192                     size = strlen(key) + 1;
 193                     if (size > len) {
 194                         free(status);
 195                         return NSD_ERROR;
 196                     }
 197                     len -= size;
 198                     strncat(response,key,size);
 199                     strncat(response,"\t",1);
 200                     for (i = 0; i < count; i++) {
 201                         /* ignore group names */
 202                         if (status[i].flags & 0x80) continue;
 203                         if (status[i].type == 0x20) {
 204                                 size = sizeof(status[i].name) + 1;
 205                                 if (size > len) {
 206                                     free(status);
 207                                     return NSD_ERROR;
 208                                 }
 209                                 len -= size;
 210                                 strncat(response, status[i].name, size);
 211                                 strncat(response, " ", 1);
 212                                 found = True;
 213                         }
 214                     }
 215                     response[strlen(response)-1] = '\n';
 216                     free(status);
 217                 }
 218         } else if (strcasecmp(map,"hosts.byname") == 0) {
 219             if (ip_list = lookup_byname_backend(key, &count)) {
 220                 for (i = count; i ; i--) {
 221                     addr = inet_ntoa(ip_list[i-1]);
 222                     size = strlen(addr) + 1;
 223                     if (size > len) {
 224                         free(ip_list);
 225                         return NSD_ERROR;
 226                     }
 227                     len -= size;
 228                     if (i != 0)
 229                         response[strlen(response)-1] = ' ';
 230                     strncat(response,addr,size);
 231                     strncat(response,"\t",1);
 232                 }
 233                 size = strlen(key) + 1;
 234                 if (size > len) {
 235                     free(ip_list);
 236                     return NSD_ERROR;
 237                 }
 238                 strncat(response,key,size);
 239                 strncat(response,"\n",1);
 240                 found = True;
 241                 free(ip_list);
 242             }
 243         }
 244
 245         if (found) {
 246             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 247             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 248             return NSD_OK;
 249         }
 250         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 251         rq->f_status = NS_NOTFOUND;
 252         return NSD_NEXT;
 253 }
 254
 255 #else
 256 /****************************************************************************
 257 gethostbyname() - we ignore any domain portion of the name and only
 258 handle names that are at most 15 characters long
 259   **************************************************************************/
 260 NSS_STATUS
 261 _nss_wins_gethostbyname_r(const char *name, struct hostent *he,
 262                           char *buffer, size_t buflen, int *errnop,
 263                           int *h_errnop)
 264 {
 265         char **host_addresses;
 266         struct in_addr *ip_list;
 267         int i, count;
 268         size_t namelen = strlen(name) + 1;
 269
 270         memset(he, '\0', sizeof(*he));
 271
 272         ip_list = lookup_byname_backend(name, &count);
 273         if (!ip_list) {
 274                 return NSS_STATUS_NOTFOUND;
 275         }
 276
 277         if (buflen < namelen + (2*count+1)*INADDRSZ) {
 278                 /* no ENOMEM error type?! */
 279                 return NSS_STATUS_NOTFOUND;
 280         }
 281
 282
 283         host_addresses = (char **)buffer;
 284         he->h_addr_list = host_addresses;
 285         host_addresses[count] = NULL;
 286         buffer += (count + 1) * INADDRSZ;
 287         buflen += (count + 1) * INADDRSZ;
 288         he->h_addrtype = AF_INET;
 289         he->h_length = INADDRSZ;
 290
 291         for (i=0;i<count;i++) {
 292                 memcpy(buffer, &ip_list[i].s_addr, INADDRSZ);
 293                 *host_addresses = buffer;
 294                 buffer += INADDRSZ;
 295                 buflen -= INADDRSZ;
 296                 host_addresses++;
 297         }
 298
 299         if (ip_list)
 300                 free(ip_list);
 301
 302         memcpy(buffer, name, namelen);
 303         he->h_name = buffer;
 304
 305         return NSS_STATUS_SUCCESS;
 306 }
 307
 308
 309 NSS_STATUS
 310 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 311                                 char *buffer, size_t buflen, int *errnop,
 312                                 int *h_errnop)
 313 {
 314         if(af!=AF_INET) {
 315                 *h_errnop = NO_DATA;
 316                 *errnop = EAFNOSUPPORT;
 317                 return NSS_STATUS_UNAVAIL;
 318         }
 319
 320         return _nss_wins_gethostbyname_r(name,he,buffer,buflen,errnop,h_errnop);
 321 }
 322 #endif