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;
  63         struct sockaddr_storage *address = NULL;
  64         struct in_addr *ret = NULL;
  65         NTSTATUS status;
  66         const char *p;
  67         size_t nbt_len;
  68         int j;
  69
  70         if (!initialised) {
  71                 nss_wins_init();
  72         }
  73
  74         *count = 0;
  75
  76         nbt_len = strlen(name);
  77         if (nbt_len > MAX_NETBIOSNAME_LEN - 1) {
  78                 return NULL;
  79         }
  80         p = strchr(name, '.');
  81         if (p != NULL) {
  82                 return NULL;
  83         }
  84
  85         frame = talloc_stackframe();
  86         /* always try with wins first */
  87         status = resolve_wins(name, 0x00, talloc_tos(),
  88                               &address, count);
  89         if (NT_STATUS_IS_OK(status)) {
  90                 if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
  91                         TALLOC_FREE(frame);
  92                         return NULL;
  93                 }
  94                 if (address[0].ss_family != AF_INET) {
  95                         free(ret);
  96                         TALLOC_FREE(frame);
  97                         return NULL;
  98                 }
  99                 *ret = ((struct sockaddr_in *)(void *)address)
 100                         ->sin_addr;
 101                 TALLOC_FREE(frame);
 102                 return ret;
 103         }
 104
 105         /* uggh, we have to broadcast to each interface in turn */
 106         for (j=iface_count() - 1;j >= 0;j--) {
 107                 const struct in_addr *bcast = iface_n_bcast_v4(j);
 108                 struct sockaddr_storage ss;
 109                 struct sockaddr_storage *pss;
 110
 111                 if (!bcast) {
 112                         continue;
 113                 }
 114                 in_addr_to_sockaddr_storage(&ss, *bcast);
 115                 status = name_query(name, 0x00, True, True, &ss,
 116                                     talloc_tos(), &pss, count, NULL);
 117                 if (NT_STATUS_IS_OK(status) && (*count > 0)) {
 118                         if ((ret = SMB_MALLOC_P(struct in_addr)) == NULL) {
 119                                 TALLOC_FREE(frame);
 120                                 return NULL;
 121                         }
 122                         *ret = ((struct sockaddr_in *)pss)->sin_addr;
 123                         break;
 124                 }
 125         }
 126         TALLOC_FREE(frame);
 127         return ret;
 128 }
 129
 130 #ifdef HAVE_NS_API_H
 131
 132 static struct node_status *lookup_byaddr_backend(char *addr, int *count)
 133 {
 134         struct sockaddr_storage ss;
 135         struct nmb_name nname;
 136         struct node_status *result;
 137         NTSTATUS status;
 138
 139         if (!initialised) {
 140                 nss_wins_init();
 141         }
 142
 143         make_nmb_name(&nname, "*", 0);
 144         if (!interpret_string_addr(&ss, addr, AI_NUMERICHOST)) {
 145                 return NULL;
 146         }
 147         status = node_status_query(NULL, &nname, &ss, &result, count, NULL);
 148         if (!NT_STATUS_IS_OK(status)) {
 149                 return NULL;
 150         }
 151
 152         return result;
 153 }
 154
 155 /* IRIX version */
 156
 157 int init(void)
 158 {
 159         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
 160         nss_wins_init();
 161         return NSD_OK;
 162 }
 163
 164 int lookup(nsd_file_t *rq)
 165 {
 166         char *map;
 167         char *key;
 168         char *addr;
 169         struct in_addr *ip_list;
 170         struct node_status *status;
 171         int i, count, len, size;
 172         char response[1024];
 173         bool found = False;
 174
 175         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 176         if (! rq)
 177                 return NSD_ERROR;
 178
 179         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 180         if (! map) {
 181                 rq->f_status = NS_FATAL;
 182                 return NSD_ERROR;
 183         }
 184
 185         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 186         if (! key || ! *key) {
 187                 rq->f_status = NS_FATAL;
 188                 return NSD_ERROR;
 189         }
 190
 191         response[0] = '\0';
 192         len = sizeof(response) - 2;
 193
 194         /*
 195          * response needs to be a string of the following format
 196          * ip_address[ ip_address]*\tname[ alias]*
 197          */
 198         if (strcasecmp_m(map,"hosts.byaddr") == 0) {
 199                 if ( status = lookup_byaddr_backend(key, &count)) {
 200                     size = strlen(key) + 1;
 201                     if (size > len) {
 202                         talloc_free(status);
 203                         return NSD_ERROR;
 204                     }
 205                     len -= size;
 206                     strncat(response,key,size);
 207                     strncat(response,"\t",1);
 208                     for (i = 0; i < count; i++) {
 209                         /* ignore group names */
 210                         if (status[i].flags & 0x80) continue;
 211                         if (status[i].type == 0x20) {
 212                                 size = sizeof(status[i].name) + 1;
 213                                 if (size > len) {
 214                                     talloc_free(status);
 215                                     return NSD_ERROR;
 216                                 }
 217                                 len -= size;
 218                                 strncat(response, status[i].name, size);
 219                                 strncat(response, " ", 1);
 220                                 found = True;
 221                         }
 222                     }
 223                     response[strlen(response)-1] = '\n';
 224                     talloc_free(status);
 225                 }
 226         } else if (strcasecmp_m(map,"hosts.byname") == 0) {
 227             if (ip_list = lookup_byname_backend(key, &count)) {
 228                 for (i = count; i ; i--) {
 229                     addr = inet_ntoa(ip_list[i-1]);
 230                     size = strlen(addr) + 1;
 231                     if (size > len) {
 232                         free(ip_list);
 233                         return NSD_ERROR;
 234                     }
 235                     len -= size;
 236                     if (i != 0)
 237                         response[strlen(response)-1] = ' ';
 238                     strncat(response,addr,size);
 239                     strncat(response,"\t",1);
 240                 }
 241                 size = strlen(key) + 1;
 242                 if (size > len) {
 243                     free(ip_list);
 244                     return NSD_ERROR;
 245                 }
 246                 strncat(response,key,size);
 247                 strncat(response,"\n",1);
 248                 found = True;
 249                 free(ip_list);
 250             }
 251         }
 252
 253         if (found) {
 254             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 255             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 256             return NSD_OK;
 257         }
 258         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 259         rq->f_status = NS_NOTFOUND;
 260         return NSD_NEXT;
 261 }
 262
 263 #else
 264
 265 /* Allocate some space from the nss static buffer.  The buffer and buflen
 266    are the pointers passed in by the C library to the _nss_*_*
 267    functions. */
 268
 269 static char *get_static(char **buffer, size_t *buflen, int len)
 270 {
 271         char *result;
 272
 273         /* Error check.  We return false if things aren't set up right, or
 274            there isn't enough buffer space left. */
 275
 276         if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
 277                 return NULL;
 278         }
 279
 280         /* Return an index into the static buffer */
 281
 282         result = *buffer;
 283         *buffer += len;
 284         *buflen -= len;
 285
 286         return result;
 287 }
 288
 289 /****************************************************************************
 290 gethostbyname() - we ignore any domain portion of the name and only
 291 handle names that are at most 15 characters long
 292   **************************************************************************/
 293 NSS_STATUS
 294 _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
 295                           char *buffer, size_t buflen, int *h_errnop)
 296 {
 297         NSS_STATUS nss_status = NSS_STATUS_SUCCESS;
 298         struct in_addr *ip_list;
 299         int i, count;
 300         fstring name;
 301         size_t namelen;
 302         TALLOC_CTX *frame;
 303
 304 #if HAVE_PTHREAD
 305         pthread_mutex_lock(&wins_nss_mutex);
 306 #endif
 307
 308         frame = talloc_stackframe();
 309
 310         memset(he, '\0', sizeof(*he));
 311         fstrcpy(name, hostname);
 312
 313         /* Do lookup */
 314
 315         ip_list = lookup_byname_backend(name, &count);
 316
 317         if (!ip_list) {
 318                 nss_status = NSS_STATUS_NOTFOUND;
 319                 goto out;
 320         }
 321
 322         /* Copy h_name */
 323
 324         namelen = strlen(name) + 1;
 325
 326         if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL) {
 327                 free(ip_list);
 328                 nss_status = NSS_STATUS_TRYAGAIN;
 329                 goto out;
 330         }
 331
 332         memcpy(he->h_name, name, namelen);
 333
 334         /* Copy h_addr_list, align to pointer boundary first */
 335
 336         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 337                 i = sizeof(char*) - i;
 338
 339         if (get_static(&buffer, &buflen, i) == NULL) {
 340                 free(ip_list);
 341                 nss_status = NSS_STATUS_TRYAGAIN;
 342                 goto out;
 343         }
 344
 345         if ((he->h_addr_list = (char **)get_static(
 346                      &buffer, &buflen, (count + 1) * sizeof(char *))) == NULL) {
 347                 free(ip_list);
 348                 nss_status = NSS_STATUS_TRYAGAIN;
 349                 goto out;
 350         }
 351
 352         for (i = 0; i < count; i++) {
 353                 if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
 354                                                      INADDRSZ)) == NULL) {
 355                         free(ip_list);
 356                         nss_status = NSS_STATUS_TRYAGAIN;
 357                         goto out;
 358                 }
 359                 memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
 360         }
 361
 362         he->h_addr_list[count] = NULL;
 363
 364         free(ip_list);
 365
 366         /* Set h_addr_type and h_length */
 367
 368         he->h_addrtype = AF_INET;
 369         he->h_length = INADDRSZ;
 370
 371         /* Set h_aliases */
 372
 373         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 374                 i = sizeof(char*) - i;
 375
 376         if (get_static(&buffer, &buflen, i) == NULL) {
 377                 nss_status = NSS_STATUS_TRYAGAIN;
 378                 goto out;
 379         }
 380
 381         if ((he->h_aliases = (char **)get_static(
 382                      &buffer, &buflen, sizeof(char *))) == NULL) {
 383                 nss_status = NSS_STATUS_TRYAGAIN;
 384                 goto out;
 385         }
 386
 387         he->h_aliases[0] = NULL;
 388
 389         nss_status = NSS_STATUS_SUCCESS;
 390
 391   out:
 392
 393         TALLOC_FREE(frame);
 394
 395 #if HAVE_PTHREAD
 396         pthread_mutex_unlock(&wins_nss_mutex);
 397 #endif
 398         return nss_status;
 399 }
 400
 401
 402 NSS_STATUS
 403 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 404                            char *buffer, size_t buflen, int *h_errnop)
 405 {
 406         NSS_STATUS nss_status;
 407
 408         if(af!=AF_INET) {
 409                 *h_errnop = NO_DATA;
 410                 nss_status = NSS_STATUS_UNAVAIL;
 411         } else {
 412                 nss_status = _nss_wins_gethostbyname_r(
 413                                 name, he, buffer, buflen, h_errnop);
 414         }
 415         return nss_status;
 416 }
 417 #endif