source/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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20 */
  21
  22 #include "includes.h"
  23 #ifdef HAVE_NS_API_H
  24 #undef VOLATILE
  25
  26 #include <ns_daemon.h>
  27 #endif
  28
  29 #ifndef INADDRSZ
  30 #define INADDRSZ 4
  31 #endif
  32
  33 static int initialised;
  34
  35 extern BOOL AllowDebugChange;
  36
  37 /* Use our own create socket code so we don't recurse.... */
  38
  39 static int wins_lookup_open_socket_in(void)
  40 {
  41         struct sockaddr_in sock;
  42         int val=1;
  43         int res;
  44
  45         memset((char *)&sock,'\0',sizeof(sock));
  46
  47 #ifdef HAVE_SOCK_SIN_LEN
  48         sock.sin_len = sizeof(sock);
  49 #endif
  50         sock.sin_port = 0;
  51         sock.sin_family = AF_INET;
  52         sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
  53         res = socket(AF_INET, SOCK_DGRAM, 0);
  54         if (res == -1)
  55                 return -1;
  56
  57         setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
  58 #ifdef SO_REUSEPORT
  59         setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
  60 #endif /* SO_REUSEPORT */
  61
  62         /* now we've got a socket - we need to bind it */
  63
  64         if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
  65                 close(res);
  66                 return(-1);
  67         }
  68
  69         set_socket_options(res,"SO_BROADCAST");
  70
  71         return res;
  72 }
  73
  74
  75 static void nss_wins_init(void)
  76 {
  77         initialised = 1;
  78         DEBUGLEVEL = 0;
  79         AllowDebugChange = False;
  80
  81         TimeInit();
  82         setup_logging("nss_wins",False);
  83         load_case_tables();
  84         lp_load(dyn_CONFIGFILE,True,False,False,True);
  85         load_interfaces();
  86 }
  87
  88 static struct in_addr *lookup_byname_backend(const char *name, int *count)
  89 {
  90         int fd = -1;
  91         struct ip_service *address = NULL;
  92         struct in_addr *ret = NULL;
  93         int j, flags = 0;
  94
  95         if (!initialised) {
  96                 nss_wins_init();
  97         }
  98
  99         *count = 0;
 100
 101         /* always try with wins first */
 102         if (resolve_wins(name,0x00,&address,count)) {
 103                 if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
 104                         free( address );
 105                         return NULL;
 106                 }
 107                 *ret = address[0].ip;
 108                 free( address );
 109                 return ret;
 110         }
 111
 112         fd = wins_lookup_open_socket_in();
 113         if (fd == -1) {
 114                 return NULL;
 115         }
 116
 117         /* uggh, we have to broadcast to each interface in turn */
 118         for (j=iface_count() - 1;j >= 0;j--) {
 119                 struct in_addr *bcast = iface_n_bcast(j);
 120                 ret = name_query(fd,name,0x00,True,True,*bcast,count, &flags, NULL);
 121                 if (ret) break;
 122         }
 123
 124         close(fd);
 125         return ret;
 126 }
 127
 128 #ifdef HAVE_NS_API_H
 129
 130 static NODE_STATUS_STRUCT *lookup_byaddr_backend(char *addr, int *count)
 131 {
 132         int fd;
 133         struct in_addr  ip;
 134         struct nmb_name nname;
 135         NODE_STATUS_STRUCT *status;
 136
 137         if (!initialised) {
 138                 nss_wins_init();
 139         }
 140
 141         fd = wins_lookup_open_socket_in();
 142         if (fd == -1)
 143                 return NULL;
 144
 145         make_nmb_name(&nname, "*", 0);
 146         ip = *interpret_addr2(addr);
 147         status = node_status_query(fd,&nname,ip, count, NULL);
 148
 149         close(fd);
 150         return status;
 151 }
 152
 153 /* IRIX version */
 154
 155 int init(void)
 156 {
 157         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
 158         nss_wins_init();
 159         return NSD_OK;
 160 }
 161
 162 int lookup(nsd_file_t *rq)
 163 {
 164         char *map;
 165         char *key;
 166         char *addr;
 167         struct in_addr *ip_list;
 168         NODE_STATUS_STRUCT *status;
 169         int i, count, len, size;
 170         char response[1024];
 171         BOOL found = False;
 172
 173         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 174         if (! rq)
 175                 return NSD_ERROR;
 176
 177         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 178         if (! map) {
 179                 rq->f_status = NS_FATAL;
 180                 return NSD_ERROR;
 181         }
 182
 183         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 184         if (! key || ! *key) {
 185                 rq->f_status = NS_FATAL;
 186                 return NSD_ERROR;
 187         }
 188
 189         response[0] = '\0';
 190         len = sizeof(response) - 2;
 191
 192         /*
 193          * response needs to be a string of the following format
 194          * ip_address[ ip_address]*\tname[ alias]*
 195          */
 196         if (StrCaseCmp(map,"hosts.byaddr") == 0) {
 197                 if ( status = lookup_byaddr_backend(key, &count)) {
 198                     size = strlen(key) + 1;
 199                     if (size > len) {
 200                         free(status);
 201                         return NSD_ERROR;
 202                     }
 203                     len -= size;
 204                     strncat(response,key,size);
 205                     strncat(response,"\t",1);
 206                     for (i = 0; i < count; i++) {
 207                         /* ignore group names */
 208                         if (status[i].flags & 0x80) continue;
 209                         if (status[i].type == 0x20) {
 210                                 size = sizeof(status[i].name) + 1;
 211                                 if (size > len) {
 212                                     free(status);
 213                                     return NSD_ERROR;
 214                                 }
 215                                 len -= size;
 216                                 strncat(response, status[i].name, size);
 217                                 strncat(response, " ", 1);
 218                                 found = True;
 219                         }
 220                     }
 221                     response[strlen(response)-1] = '\n';
 222                     free(status);
 223                 }
 224         } else if (StrCaseCmp(map,"hosts.byname") == 0) {
 225             if (ip_list = lookup_byname_backend(key, &count)) {
 226                 for (i = count; i ; i--) {
 227                     addr = inet_ntoa(ip_list[i-1]);
 228                     size = strlen(addr) + 1;
 229                     if (size > len) {
 230                         free(ip_list);
 231                         return NSD_ERROR;
 232                     }
 233                     len -= size;
 234                     if (i != 0)
 235                         response[strlen(response)-1] = ' ';
 236                     strncat(response,addr,size);
 237                     strncat(response,"\t",1);
 238                 }
 239                 size = strlen(key) + 1;
 240                 if (size > len) {
 241                     free(ip_list);
 242                     return NSD_ERROR;
 243                 }
 244                 strncat(response,key,size);
 245                 strncat(response,"\n",1);
 246                 found = True;
 247                 free(ip_list);
 248             }
 249         }
 250
 251         if (found) {
 252             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 253             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 254             return NSD_OK;
 255         }
 256         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 257         rq->f_status = NS_NOTFOUND;
 258         return NSD_NEXT;
 259 }
 260
 261 #else
 262
 263 /* Allocate some space from the nss static buffer.  The buffer and buflen
 264    are the pointers passed in by the C library to the _nss_*_*
 265    functions. */
 266
 267 static char *get_static(char **buffer, size_t *buflen, int len)
 268 {
 269         char *result;
 270
 271         /* Error check.  We return false if things aren't set up right, or
 272            there isn't enough buffer space left. */
 273
 274         if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
 275                 return NULL;
 276         }
 277
 278         /* Return an index into the static buffer */
 279
 280         result = *buffer;
 281         *buffer += len;
 282         *buflen -= len;
 283
 284         return result;
 285 }
 286
 287 /****************************************************************************
 288 gethostbyname() - we ignore any domain portion of the name and only
 289 handle names that are at most 15 characters long
 290   **************************************************************************/
 291 NSS_STATUS
 292 _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
 293                           char *buffer, size_t buflen, int *h_errnop)
 294 {
 295         struct in_addr *ip_list;
 296         int i, count;
 297         fstring name;
 298         size_t namelen;
 299
 300         memset(he, '\0', sizeof(*he));
 301         fstrcpy(name, hostname);
 302
 303         /* Do lookup */
 304
 305         ip_list = lookup_byname_backend(name, &count);
 306
 307         if (!ip_list)
 308                 return NSS_STATUS_NOTFOUND;
 309
 310         /* Copy h_name */
 311
 312         namelen = strlen(name) + 1;
 313
 314         if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL)
 315                 return NSS_STATUS_TRYAGAIN;
 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                 return NSS_STATUS_TRYAGAIN;
 326
 327         if ((he->h_addr_list = (char **)get_static(
 328                      &buffer, &buflen, (count + 1) * sizeof(char *))) == NULL)
 329                 return NSS_STATUS_TRYAGAIN;
 330
 331         for (i = 0; i < count; i++) {
 332                 if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
 333                                                      INADDRSZ)) == NULL)
 334                         return NSS_STATUS_TRYAGAIN;
 335                 memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
 336         }
 337
 338         he->h_addr_list[count] = NULL;
 339
 340         if (ip_list)
 341                 free(ip_list);
 342
 343         /* Set h_addr_type and h_length */
 344
 345         he->h_addrtype = AF_INET;
 346         he->h_length = INADDRSZ;
 347
 348         /* Set h_aliases */
 349
 350         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 351                 i = sizeof(char*) - i;
 352
 353         if (get_static(&buffer, &buflen, i) == NULL)
 354                 return NSS_STATUS_TRYAGAIN;
 355
 356         if ((he->h_aliases = (char **)get_static(
 357                      &buffer, &buflen, sizeof(char *))) == NULL)
 358                 return NSS_STATUS_TRYAGAIN;
 359
 360         he->h_aliases[0] = NULL;
 361
 362         return NSS_STATUS_SUCCESS;
 363 }
 364
 365
 366 NSS_STATUS
 367 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 368                            char *buffer, size_t buflen, int *h_errnop)
 369 {
 370         if(af!=AF_INET) {
 371                 *h_errnop = NO_DATA;
 372                 return NSS_STATUS_UNAVAIL;
 373         }
 374
 375         return _nss_wins_gethostbyname_r(
 376                 name, he, buffer, buflen, h_errnop);
 377 }
 378 #endif