source/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",False);
  83         lp_load(dyn_CONFIGFILE,True,False,False);
  84         load_interfaces();
  85 }
  86
  87 static struct in_addr *lookup_byname_backend(const char *name, int *count)
  88 {
  89         int fd = -1;
  90         struct ip_service *address = NULL;
  91         struct in_addr *ret = NULL;
  92         int j, flags = 0;
  93
  94         if (!initialised) {
  95                 nss_wins_init();
  96         }
  97
  98         *count = 0;
  99
 100         /* always try with wins first */
 101         if (resolve_wins(name,0x00,&address,count)) {
 102                 if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
 103                         free( address );
 104                         return NULL;
 105                 }
 106                 *ret = address[0].ip;
 107                 free( address );
 108                 return ret;
 109         }
 110
 111         fd = wins_lookup_open_socket_in();
 112         if (fd == -1) {
 113                 return NULL;
 114         }
 115
 116         /* uggh, we have to broadcast to each interface in turn */
 117         for (j=iface_count() - 1;j >= 0;j--) {
 118                 struct in_addr *bcast = iface_n_bcast(j);
 119                 ret = name_query(fd,name,0x00,True,True,*bcast,count, &flags, NULL);
 120                 if (ret) break;
 121         }
 122
 123         close(fd);
 124         return ret;
 125 }
 126
 127 #ifdef HAVE_NS_API_H
 128
 129 static NODE_STATUS_STRUCT *lookup_byaddr_backend(char *addr, int *count)
 130 {
 131         int fd;
 132         struct in_addr  ip;
 133         struct nmb_name nname;
 134         NODE_STATUS_STRUCT *status;
 135
 136         if (!initialised) {
 137                 nss_wins_init();
 138         }
 139
 140         fd = wins_lookup_open_socket_in();
 141         if (fd == -1)
 142                 return NULL;
 143
 144         make_nmb_name(&nname, "*", 0);
 145         ip = *interpret_addr2(addr);
 146         status = node_status_query(fd,&nname,ip, count, NULL);
 147
 148         close(fd);
 149         return status;
 150 }
 151
 152 /* IRIX version */
 153
 154 int init(void)
 155 {
 156         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
 157         nss_wins_init();
 158         return NSD_OK;
 159 }
 160
 161 int lookup(nsd_file_t *rq)
 162 {
 163         char *map;
 164         char *key;
 165         char *addr;
 166         struct in_addr *ip_list;
 167         NODE_STATUS_STRUCT *status;
 168         int i, count, len, size;
 169         char response[1024];
 170         BOOL found = False;
 171
 172         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 173         if (! rq)
 174                 return NSD_ERROR;
 175
 176         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 177         if (! map) {
 178                 rq->f_status = NS_FATAL;
 179                 return NSD_ERROR;
 180         }
 181
 182         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 183         if (! key || ! *key) {
 184                 rq->f_status = NS_FATAL;
 185                 return NSD_ERROR;
 186         }
 187
 188         response[0] = '\0';
 189         len = sizeof(response) - 2;
 190
 191         /*
 192          * response needs to be a string of the following format
 193          * ip_address[ ip_address]*\tname[ alias]*
 194          */
 195         if (StrCaseCmp(map,"hosts.byaddr") == 0) {
 196                 if ( status = lookup_byaddr_backend(key, &count)) {
 197                     size = strlen(key) + 1;
 198                     if (size > len) {
 199                         free(status);
 200                         return NSD_ERROR;
 201                     }
 202                     len -= size;
 203                     strncat(response,key,size);
 204                     strncat(response,"\t",1);
 205                     for (i = 0; i < count; i++) {
 206                         /* ignore group names */
 207                         if (status[i].flags & 0x80) continue;
 208                         if (status[i].type == 0x20) {
 209                                 size = sizeof(status[i].name) + 1;
 210                                 if (size > len) {
 211                                     free(status);
 212                                     return NSD_ERROR;
 213                                 }
 214                                 len -= size;
 215                                 strncat(response, status[i].name, size);
 216                                 strncat(response, " ", 1);
 217                                 found = True;
 218                         }
 219                     }
 220                     response[strlen(response)-1] = '\n';
 221                     free(status);
 222                 }
 223         } else if (StrCaseCmp(map,"hosts.byname") == 0) {
 224             if (ip_list = lookup_byname_backend(key, &count)) {
 225                 for (i = count; i ; i--) {
 226                     addr = inet_ntoa(ip_list[i-1]);
 227                     size = strlen(addr) + 1;
 228                     if (size > len) {
 229                         free(ip_list);
 230                         return NSD_ERROR;
 231                     }
 232                     len -= size;
 233                     if (i != 0)
 234                         response[strlen(response)-1] = ' ';
 235                     strncat(response,addr,size);
 236                     strncat(response,"\t",1);
 237                 }
 238                 size = strlen(key) + 1;
 239                 if (size > len) {
 240                     free(ip_list);
 241                     return NSD_ERROR;
 242                 }
 243                 strncat(response,key,size);
 244                 strncat(response,"\n",1);
 245                 found = True;
 246                 free(ip_list);
 247             }
 248         }
 249
 250         if (found) {
 251             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 252             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 253             return NSD_OK;
 254         }
 255         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 256         rq->f_status = NS_NOTFOUND;
 257         return NSD_NEXT;
 258 }
 259
 260 #else
 261
 262 /* Allocate some space from the nss static buffer.  The buffer and buflen
 263    are the pointers passed in by the C library to the _nss_*_*
 264    functions. */
 265
 266 static char *get_static(char **buffer, size_t *buflen, int len)
 267 {
 268         char *result;
 269
 270         /* Error check.  We return false if things aren't set up right, or
 271            there isn't enough buffer space left. */
 272
 273         if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
 274                 return NULL;
 275         }
 276
 277         /* Return an index into the static buffer */
 278
 279         result = *buffer;
 280         *buffer += len;
 281         *buflen -= len;
 282
 283         return result;
 284 }
 285
 286 /****************************************************************************
 287 gethostbyname() - we ignore any domain portion of the name and only
 288 handle names that are at most 15 characters long
 289   **************************************************************************/
 290 NSS_STATUS
 291 _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
 292                           char *buffer, size_t buflen, int *h_errnop)
 293 {
 294         struct in_addr *ip_list;
 295         int i, count;
 296         fstring name;
 297         size_t namelen;
 298
 299         memset(he, '\0', sizeof(*he));
 300         fstrcpy(name, hostname);
 301
 302         /* Do lookup */
 303
 304         ip_list = lookup_byname_backend(name, &count);
 305
 306         if (!ip_list)
 307                 return NSS_STATUS_NOTFOUND;
 308
 309         /* Copy h_name */
 310
 311         namelen = strlen(name) + 1;
 312
 313         if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL)
 314                 return NSS_STATUS_TRYAGAIN;
 315
 316         memcpy(he->h_name, name, namelen);
 317
 318         /* Copy h_addr_list, align to pointer boundary first */
 319
 320         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 321                 i = sizeof(char*) - i;
 322
 323         if (get_static(&buffer, &buflen, i) == NULL)
 324                 return NSS_STATUS_TRYAGAIN;
 325
 326         if ((he->h_addr_list = (char **)get_static(
 327                      &buffer, &buflen, (count + 1) * sizeof(char *))) == NULL)
 328                 return NSS_STATUS_TRYAGAIN;
 329
 330         for (i = 0; i < count; i++) {
 331                 if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
 332                                                      INADDRSZ)) == NULL)
 333                         return NSS_STATUS_TRYAGAIN;
 334                 memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
 335         }
 336
 337         he->h_addr_list[count] = NULL;
 338
 339         if (ip_list)
 340                 free(ip_list);
 341
 342         /* Set h_addr_type and h_length */
 343
 344         he->h_addrtype = AF_INET;
 345         he->h_length = INADDRSZ;
 346
 347         /* Set h_aliases */
 348
 349         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 350                 i = sizeof(char*) - i;
 351
 352         if (get_static(&buffer, &buflen, i) == NULL)
 353                 return NSS_STATUS_TRYAGAIN;
 354
 355         if ((he->h_aliases = (char **)get_static(
 356                      &buffer, &buflen, sizeof(char *))) == NULL)
 357                 return NSS_STATUS_TRYAGAIN;
 358
 359         he->h_aliases[0] = NULL;
 360
 361         return NSS_STATUS_SUCCESS;
 362 }
 363
 364
 365 NSS_STATUS
 366 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 367                            char *buffer, size_t buflen, int *h_errnop)
 368 {
 369         if(af!=AF_INET) {
 370                 *h_errnop = NO_DATA;
 371                 return NSS_STATUS_UNAVAIL;
 372         }
 373
 374         return _nss_wins_gethostbyname_r(
 375                 name, he, buffer, buflen, h_errnop);
 376 }
 377 #endif