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