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 3 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, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "includes.h"
  22 #include "nsswitch/winbind_nss.h"
  23
  24 #ifdef HAVE_NS_API_H
  25
  26 #include <ns_daemon.h>
  27 #endif
  28
  29 #if HAVE_PTHREAD_H
  30 #include <pthread.h>
  31 #endif
  32
  33 #if HAVE_PTHREAD
  34 static pthread_mutex_t wins_nss_mutex = PTHREAD_MUTEX_INITIALIZER;
  35 #endif
  36
  37 #ifndef INADDRSZ
  38 #define INADDRSZ 4
  39 #endif
  40
  41 static int initialised;
  42
  43 NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
  44                           char *buffer, size_t buflen, int *h_errnop);
  45 NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
  46                            char *buffer, size_t buflen, int *h_errnop);
  47
  48 static void nss_wins_init(void)
  49 {
  50         initialised = 1;
  51         load_case_tables_library();
  52         lp_set_cmdline("log level", "0");
  53
  54         TimeInit();
  55         setup_logging("nss_wins",False);
  56         lp_load(get_dyn_CONFIGFILE(),True,False,False,True);
  57         load_interfaces();
  58 }
  59
  60 static struct in_addr *lookup_byname_backend(const char *name, int *count)
  61 {
  62         TALLOC_CTX *frame = talloc_stackframe();
  63         struct ip_service *address = NULL;
  64         struct in_addr *ret = NULL;
  65         int j;
  66
  67         if (!initialised) {
  68                 nss_wins_init();
  69         }
  70
  71         *count = 0;
  72
  73         /* always try with wins first */
  74         if (NT_STATUS_IS_OK(resolve_wins(name,0x00,&address,count))) {
  75                 if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
  76                         free( address );
  77                         TALLOC_FREE(frame);
  78                         return NULL;
  79                 }
  80                 if (address[0].ss.ss_family != AF_INET) {
  81                         free(address);
  82                         free(ret);
  83                         TALLOC_FREE(frame);
  84                         return NULL;
  85                 }
  86                 *ret = ((struct sockaddr_in *)(void *)&address[0].ss)
  87                         ->sin_addr;
  88                 free( address );
  89                 TALLOC_FREE(frame);
  90                 return ret;
  91         }
  92
  93         /* uggh, we have to broadcast to each interface in turn */
  94         for (j=iface_count() - 1;j >= 0;j--) {
  95                 const struct in_addr *bcast = iface_n_bcast_v4(j);
  96                 struct sockaddr_storage ss;
  97                 struct sockaddr_storage *pss;
  98                 NTSTATUS status;
  99
 100                 if (!bcast) {
 101                         continue;
 102                 }
 103                 in_addr_to_sockaddr_storage(&ss, *bcast);
 104                 status = name_query(name, 0x00, True, True, &ss,
 105                                     talloc_tos(), &pss, count, NULL);
 106                 if (NT_STATUS_IS_OK(status) && (*count > 0)) {
 107                         if ((ret = SMB_MALLOC_P(struct in_addr)) == NULL) {
 108                                 TALLOC_FREE(frame);
 109                                 return NULL;
 110                         }
 111                         *ret = ((struct sockaddr_in *)pss)->sin_addr;
 112                         break;
 113                 }
 114         }
 115         TALLOC_FREE(frame);
 116         return ret;
 117 }
 118
 119 #ifdef HAVE_NS_API_H
 120
 121 static struct node_status *lookup_byaddr_backend(char *addr, int *count)
 122 {
 123         struct sockaddr_storage ss;
 124         struct nmb_name nname;
 125         struct node_status *result;
 126         NTSTATUS status;
 127
 128         if (!initialised) {
 129                 nss_wins_init();
 130         }
 131
 132         make_nmb_name(&nname, "*", 0);
 133         if (!interpret_string_addr(&ss, addr, AI_NUMERICHOST)) {
 134                 return NULL;
 135         }
 136         status = node_status_query(NULL, &nname, &ss, &result, count, NULL);
 137         if (!NT_STATUS_IS_OK(status)) {
 138                 return NULL;
 139         }
 140
 141         return result;
 142 }
 143
 144 /* IRIX version */
 145
 146 int init(void)
 147 {
 148         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
 149         nss_wins_init();
 150         return NSD_OK;
 151 }
 152
 153 int lookup(nsd_file_t *rq)
 154 {
 155         char *map;
 156         char *key;
 157         char *addr;
 158         struct in_addr *ip_list;
 159         struct node_status *status;
 160         int i, count, len, size;
 161         char response[1024];
 162         bool found = False;
 163
 164         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 165         if (! rq)
 166                 return NSD_ERROR;
 167
 168         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 169         if (! map) {
 170                 rq->f_status = NS_FATAL;
 171                 return NSD_ERROR;
 172         }
 173
 174         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 175         if (! key || ! *key) {
 176                 rq->f_status = NS_FATAL;
 177                 return NSD_ERROR;
 178         }
 179
 180         response[0] = '\0';
 181         len = sizeof(response) - 2;
 182
 183         /*
 184          * response needs to be a string of the following format
 185          * ip_address[ ip_address]*\tname[ alias]*
 186          */
 187         if (strcasecmp_m(map,"hosts.byaddr") == 0) {
 188                 if ( status = lookup_byaddr_backend(key, &count)) {
 189                     size = strlen(key) + 1;
 190                     if (size > len) {
 191                         talloc_free(status);
 192                         return NSD_ERROR;
 193                     }
 194                     len -= size;
 195                     strncat(response,key,size);
 196                     strncat(response,"\t",1);
 197                     for (i = 0; i < count; i++) {
 198                         /* ignore group names */
 199                         if (status[i].flags & 0x80) continue;
 200                         if (status[i].type == 0x20) {
 201                                 size = sizeof(status[i].name) + 1;
 202                                 if (size > len) {
 203                                     talloc_free(status);
 204                                     return NSD_ERROR;
 205                                 }
 206                                 len -= size;
 207                                 strncat(response, status[i].name, size);
 208                                 strncat(response, " ", 1);
 209                                 found = True;
 210                         }
 211                     }
 212                     response[strlen(response)-1] = '\n';
 213                     talloc_free(status);
 214                 }
 215         } else if (strcasecmp_m(map,"hosts.byname") == 0) {
 216             if (ip_list = lookup_byname_backend(key, &count)) {
 217                 for (i = count; i ; i--) {
 218                     addr = inet_ntoa(ip_list[i-1]);
 219                     size = strlen(addr) + 1;
 220                     if (size > len) {
 221                         free(ip_list);
 222                         return NSD_ERROR;
 223                     }
 224                     len -= size;
 225                     if (i != 0)
 226                         response[strlen(response)-1] = ' ';
 227                     strncat(response,addr,size);
 228                     strncat(response,"\t",1);
 229                 }
 230                 size = strlen(key) + 1;
 231                 if (size > len) {
 232                     free(ip_list);
 233                     return NSD_ERROR;
 234                 }
 235                 strncat(response,key,size);
 236                 strncat(response,"\n",1);
 237                 found = True;
 238                 free(ip_list);
 239             }
 240         }
 241
 242         if (found) {
 243             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 244             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 245             return NSD_OK;
 246         }
 247         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 248         rq->f_status = NS_NOTFOUND;
 249         return NSD_NEXT;
 250 }
 251
 252 #else
 253
 254 /* Allocate some space from the nss static buffer.  The buffer and buflen
 255    are the pointers passed in by the C library to the _nss_*_*
 256    functions. */
 257
 258 static char *get_static(char **buffer, size_t *buflen, int len)
 259 {
 260         char *result;
 261
 262         /* Error check.  We return false if things aren't set up right, or
 263            there isn't enough buffer space left. */
 264
 265         if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
 266                 return NULL;
 267         }
 268
 269         /* Return an index into the static buffer */
 270
 271         result = *buffer;
 272         *buffer += len;
 273         *buflen -= len;
 274
 275         return result;
 276 }
 277
 278 /****************************************************************************
 279 gethostbyname() - we ignore any domain portion of the name and only
 280 handle names that are at most 15 characters long
 281   **************************************************************************/
 282 NSS_STATUS
 283 _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
 284                           char *buffer, size_t buflen, int *h_errnop)
 285 {
 286         NSS_STATUS nss_status = NSS_STATUS_SUCCESS;
 287         struct in_addr *ip_list;
 288         int i, count;
 289         fstring name;
 290         size_t namelen;
 291         TALLOC_CTX *frame;
 292
 293 #if HAVE_PTHREAD
 294         pthread_mutex_lock(&wins_nss_mutex);
 295 #endif
 296
 297         frame = talloc_stackframe();
 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                 nss_status = NSS_STATUS_NOTFOUND;
 308                 goto out;
 309         }
 310
 311         /* Copy h_name */
 312
 313         namelen = strlen(name) + 1;
 314
 315         if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL) {
 316                 free(ip_list);
 317                 nss_status = NSS_STATUS_TRYAGAIN;
 318                 goto out;
 319         }
 320
 321         memcpy(he->h_name, name, namelen);
 322
 323         /* Copy h_addr_list, align to pointer boundary first */
 324
 325         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 326                 i = sizeof(char*) - i;
 327
 328         if (get_static(&buffer, &buflen, i) == NULL) {
 329                 free(ip_list);
 330                 nss_status = NSS_STATUS_TRYAGAIN;
 331                 goto out;
 332         }
 333
 334         if ((he->h_addr_list = (char **)get_static(
 335                      &buffer, &buflen, (count + 1) * sizeof(char *))) == NULL) {
 336                 free(ip_list);
 337                 nss_status = NSS_STATUS_TRYAGAIN;
 338                 goto out;
 339         }
 340
 341         for (i = 0; i < count; i++) {
 342                 if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
 343                                                      INADDRSZ)) == NULL) {
 344                         free(ip_list);
 345                         nss_status = NSS_STATUS_TRYAGAIN;
 346                         goto out;
 347                 }
 348                 memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
 349         }
 350
 351         he->h_addr_list[count] = NULL;
 352
 353         free(ip_list);
 354
 355         /* Set h_addr_type and h_length */
 356
 357         he->h_addrtype = AF_INET;
 358         he->h_length = INADDRSZ;
 359
 360         /* Set h_aliases */
 361
 362         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 363                 i = sizeof(char*) - i;
 364
 365         if (get_static(&buffer, &buflen, i) == NULL) {
 366                 nss_status = NSS_STATUS_TRYAGAIN;
 367                 goto out;
 368         }
 369
 370         if ((he->h_aliases = (char **)get_static(
 371                      &buffer, &buflen, sizeof(char *))) == NULL) {
 372                 nss_status = NSS_STATUS_TRYAGAIN;
 373                 goto out;
 374         }
 375
 376         he->h_aliases[0] = NULL;
 377
 378         nss_status = NSS_STATUS_SUCCESS;
 379
 380   out:
 381
 382         TALLOC_FREE(frame);
 383
 384 #if HAVE_PTHREAD
 385         pthread_mutex_unlock(&wins_nss_mutex);
 386 #endif
 387         return nss_status;
 388 }
 389
 390
 391 NSS_STATUS
 392 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 393                            char *buffer, size_t buflen, int *h_errnop)
 394 {
 395         NSS_STATUS nss_status;
 396
 397         if(af!=AF_INET) {
 398                 *h_errnop = NO_DATA;
 399                 nss_status = NSS_STATUS_UNAVAIL;
 400         } else {
 401                 nss_status = _nss_wins_gethostbyname_r(
 402                                 name, he, buffer, buflen, h_errnop);
 403         }
 404         return nss_status;
 405 }
 406 #endif