source3/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 #ifdef HAVE_NS_API_H
  23 #undef VOLATILE
  24
  25 #include <ns_daemon.h>
  26 #endif
  27
  28 #ifndef INADDRSZ
  29 #define INADDRSZ 4
  30 #endif
  31
  32 static int initialised;
  33
  34 extern BOOL AllowDebugChange;
  35
  36 NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
  37                           char *buffer, size_t buflen, int *h_errnop);
  38 NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
  39                            char *buffer, size_t buflen, int *h_errnop);
  40
  41 /* Use our own create socket code so we don't recurse.... */
  42
  43 static int wins_lookup_open_socket_in(void)
  44 {
  45         struct sockaddr_in sock;
  46         int val=1;
  47         int res;
  48
  49         memset((char *)&sock,'\0',sizeof(sock));
  50
  51 #ifdef HAVE_SOCK_SIN_LEN
  52         sock.sin_len = sizeof(sock);
  53 #endif
  54         sock.sin_port = 0;
  55         sock.sin_family = AF_INET;
  56         sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
  57         res = socket(AF_INET, SOCK_DGRAM, 0);
  58         if (res == -1)
  59                 return -1;
  60
  61         setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
  62 #ifdef SO_REUSEPORT
  63         setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
  64 #endif /* SO_REUSEPORT */
  65
  66         /* now we've got a socket - we need to bind it */
  67
  68         if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
  69                 close(res);
  70                 return(-1);
  71         }
  72
  73         set_socket_options(res,"SO_BROADCAST");
  74
  75         return res;
  76 }
  77
  78
  79 static void nss_wins_init(void)
  80 {
  81         initialised = 1;
  82         DEBUGLEVEL = 0;
  83         AllowDebugChange = False;
  84
  85         TimeInit();
  86         setup_logging("nss_wins",False);
  87         load_case_tables();
  88         lp_load(dyn_CONFIGFILE,True,False,False,True);
  89         load_interfaces();
  90 }
  91
  92 static struct in_addr *lookup_byname_backend(const char *name, int *count)
  93 {
  94         int fd = -1;
  95         struct ip_service *address = NULL;
  96         struct in_addr *ret = NULL;
  97         int j, flags = 0;
  98
  99         if (!initialised) {
 100                 nss_wins_init();
 101         }
 102
 103         *count = 0;
 104
 105         /* always try with wins first */
 106         if (resolve_wins(name,0x00,&address,count)) {
 107                 if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
 108                         free( address );
 109                         return NULL;
 110                 }
 111                 *ret = address[0].ip;
 112                 free( address );
 113                 return ret;
 114         }
 115
 116         fd = wins_lookup_open_socket_in();
 117         if (fd == -1) {
 118                 return NULL;
 119         }
 120
 121         /* uggh, we have to broadcast to each interface in turn */
 122         for (j=iface_count() - 1;j >= 0;j--) {
 123                 struct in_addr *bcast = iface_n_bcast(j);
 124                 ret = name_query(fd,name,0x00,True,True,*bcast,count, &flags, NULL);
 125                 if (ret) break;
 126         }
 127
 128         close(fd);
 129         return ret;
 130 }
 131
 132 #ifdef HAVE_NS_API_H
 133
 134 static NODE_STATUS_STRUCT *lookup_byaddr_backend(char *addr, int *count)
 135 {
 136         int fd;
 137         struct in_addr  ip;
 138         struct nmb_name nname;
 139         NODE_STATUS_STRUCT *status;
 140
 141         if (!initialised) {
 142                 nss_wins_init();
 143         }
 144
 145         fd = wins_lookup_open_socket_in();
 146         if (fd == -1)
 147                 return NULL;
 148
 149         make_nmb_name(&nname, "*", 0);
 150         ip = *interpret_addr2(addr);
 151         status = node_status_query(fd,&nname,ip, count, NULL);
 152
 153         close(fd);
 154         return status;
 155 }
 156
 157 /* IRIX version */
 158
 159 int init(void)
 160 {
 161         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
 162         nss_wins_init();
 163         return NSD_OK;
 164 }
 165
 166 int lookup(nsd_file_t *rq)
 167 {
 168         char *map;
 169         char *key;
 170         char *addr;
 171         struct in_addr *ip_list;
 172         NODE_STATUS_STRUCT *status;
 173         int i, count, len, size;
 174         char response[1024];
 175         BOOL found = False;
 176
 177         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 178         if (! rq)
 179                 return NSD_ERROR;
 180
 181         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 182         if (! map) {
 183                 rq->f_status = NS_FATAL;
 184                 return NSD_ERROR;
 185         }
 186
 187         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 188         if (! key || ! *key) {
 189                 rq->f_status = NS_FATAL;
 190                 return NSD_ERROR;
 191         }
 192
 193         response[0] = '\0';
 194         len = sizeof(response) - 2;
 195
 196         /*
 197          * response needs to be a string of the following format
 198          * ip_address[ ip_address]*\tname[ alias]*
 199          */
 200         if (StrCaseCmp(map,"hosts.byaddr") == 0) {
 201                 if ( status = lookup_byaddr_backend(key, &count)) {
 202                     size = strlen(key) + 1;
 203                     if (size > len) {
 204                         free(status);
 205                         return NSD_ERROR;
 206                     }
 207                     len -= size;
 208                     strncat(response,key,size);
 209                     strncat(response,"\t",1);
 210                     for (i = 0; i < count; i++) {
 211                         /* ignore group names */
 212                         if (status[i].flags & 0x80) continue;
 213                         if (status[i].type == 0x20) {
 214                                 size = sizeof(status[i].name) + 1;
 215                                 if (size > len) {
 216                                     free(status);
 217                                     return NSD_ERROR;
 218                                 }
 219                                 len -= size;
 220                                 strncat(response, status[i].name, size);
 221                                 strncat(response, " ", 1);
 222                                 found = True;
 223                         }
 224                     }
 225                     response[strlen(response)-1] = '\n';
 226                     free(status);
 227                 }
 228         } else if (StrCaseCmp(map,"hosts.byname") == 0) {
 229             if (ip_list = lookup_byname_backend(key, &count)) {
 230                 for (i = count; i ; i--) {
 231                     addr = inet_ntoa(ip_list[i-1]);
 232                     size = strlen(addr) + 1;
 233                     if (size > len) {
 234                         free(ip_list);
 235                         return NSD_ERROR;
 236                     }
 237                     len -= size;
 238                     if (i != 0)
 239                         response[strlen(response)-1] = ' ';
 240                     strncat(response,addr,size);
 241                     strncat(response,"\t",1);
 242                 }
 243                 size = strlen(key) + 1;
 244                 if (size > len) {
 245                     free(ip_list);
 246                     return NSD_ERROR;
 247                 }
 248                 strncat(response,key,size);
 249                 strncat(response,"\n",1);
 250                 found = True;
 251                 free(ip_list);
 252             }
 253         }
 254
 255         if (found) {
 256             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 257             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 258             return NSD_OK;
 259         }
 260         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 261         rq->f_status = NS_NOTFOUND;
 262         return NSD_NEXT;
 263 }
 264
 265 #else
 266
 267 /* Allocate some space from the nss static buffer.  The buffer and buflen
 268    are the pointers passed in by the C library to the _nss_*_*
 269    functions. */
 270
 271 static char *get_static(char **buffer, size_t *buflen, int len)
 272 {
 273         char *result;
 274
 275         /* Error check.  We return false if things aren't set up right, or
 276            there isn't enough buffer space left. */
 277
 278         if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
 279                 return NULL;
 280         }
 281
 282         /* Return an index into the static buffer */
 283
 284         result = *buffer;
 285         *buffer += len;
 286         *buflen -= len;
 287
 288         return result;
 289 }
 290
 291 /****************************************************************************
 292 gethostbyname() - we ignore any domain portion of the name and only
 293 handle names that are at most 15 characters long
 294   **************************************************************************/
 295 NSS_STATUS
 296 _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
 297                           char *buffer, size_t buflen, int *h_errnop)
 298 {
 299         struct in_addr *ip_list;
 300         int i, count;
 301         fstring name;
 302         size_t namelen;
 303
 304         memset(he, '\0', sizeof(*he));
 305         fstrcpy(name, hostname);
 306
 307         /* Do lookup */
 308
 309         ip_list = lookup_byname_backend(name, &count);
 310
 311         if (!ip_list)
 312                 return NSS_STATUS_NOTFOUND;
 313
 314         /* Copy h_name */
 315
 316         namelen = strlen(name) + 1;
 317
 318         if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL)
 319                 return NSS_STATUS_TRYAGAIN;
 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                 return NSS_STATUS_TRYAGAIN;
 330
 331         if ((he->h_addr_list = (char **)get_static(
 332                      &buffer, &buflen, (count + 1) * sizeof(char *))) == NULL)
 333                 return NSS_STATUS_TRYAGAIN;
 334
 335         for (i = 0; i < count; i++) {
 336                 if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
 337                                                      INADDRSZ)) == NULL)
 338                         return NSS_STATUS_TRYAGAIN;
 339                 memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
 340         }
 341
 342         he->h_addr_list[count] = NULL;
 343
 344         if (ip_list)
 345                 free(ip_list);
 346
 347         /* Set h_addr_type and h_length */
 348
 349         he->h_addrtype = AF_INET;
 350         he->h_length = INADDRSZ;
 351
 352         /* Set h_aliases */
 353
 354         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 355                 i = sizeof(char*) - i;
 356
 357         if (get_static(&buffer, &buflen, i) == NULL)
 358                 return NSS_STATUS_TRYAGAIN;
 359
 360         if ((he->h_aliases = (char **)get_static(
 361                      &buffer, &buflen, sizeof(char *))) == NULL)
 362                 return NSS_STATUS_TRYAGAIN;
 363
 364         he->h_aliases[0] = NULL;
 365
 366         return NSS_STATUS_SUCCESS;
 367 }
 368
 369
 370 NSS_STATUS
 371 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 372                            char *buffer, size_t buflen, int *h_errnop)
 373 {
 374         if(af!=AF_INET) {
 375                 *h_errnop = NO_DATA;
 376                 return NSS_STATUS_UNAVAIL;
 377         }
 378
 379         return _nss_wins_gethostbyname_r(
 380                 name, he, buffer, buflen, h_errnop);
 381 }
 382 #endif