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