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 NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
  38                           char *buffer, size_t buflen, int *h_errnop);
  39 NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
  40                            char *buffer, size_t buflen, int *h_errnop);
  41
  42 /* Use our own create socket code so we don't recurse.... */
  43
  44 static int wins_lookup_open_socket_in(void)
  45 {
  46         struct sockaddr_in sock;
  47         int val=1;
  48         int res;
  49
  50         memset((char *)&sock,'\0',sizeof(sock));
  51
  52 #ifdef HAVE_SOCK_SIN_LEN
  53         sock.sin_len = sizeof(sock);
  54 #endif
  55         sock.sin_port = 0;
  56         sock.sin_family = AF_INET;
  57         sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
  58         res = socket(AF_INET, SOCK_DGRAM, 0);
  59         if (res == -1)
  60                 return -1;
  61
  62         setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
  63 #ifdef SO_REUSEPORT
  64         setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
  65 #endif /* SO_REUSEPORT */
  66
  67         /* now we've got a socket - we need to bind it */
  68
  69         if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
  70                 close(res);
  71                 return(-1);
  72         }
  73
  74         set_socket_options(res,"SO_BROADCAST");
  75
  76         return res;
  77 }
  78
  79
  80 static void nss_wins_init(void)
  81 {
  82         initialised = 1;
  83         DEBUGLEVEL = 0;
  84         AllowDebugChange = False;
  85
  86         TimeInit();
  87         setup_logging("nss_wins",False);
  88         load_case_tables();
  89         lp_load(dyn_CONFIGFILE,True,False,False,True);
  90         load_interfaces();
  91 }
  92
  93 static struct in_addr *lookup_byname_backend(const char *name, int *count)
  94 {
  95         int fd = -1;
  96         struct ip_service *address = NULL;
  97         struct in_addr *ret = NULL;
  98         int j, flags = 0;
  99
 100         if (!initialised) {
 101                 nss_wins_init();
 102         }
 103
 104         *count = 0;
 105
 106         /* always try with wins first */
 107         if (resolve_wins(name,0x00,&address,count)) {
 108                 if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
 109                         free( address );
 110                         return NULL;
 111                 }
 112                 *ret = address[0].ip;
 113                 free( address );
 114                 return ret;
 115         }
 116
 117         fd = wins_lookup_open_socket_in();
 118         if (fd == -1) {
 119                 return NULL;
 120         }
 121
 122         /* uggh, we have to broadcast to each interface in turn */
 123         for (j=iface_count() - 1;j >= 0;j--) {
 124                 struct in_addr *bcast = iface_n_bcast(j);
 125                 ret = name_query(fd,name,0x00,True,True,*bcast,count, &flags, NULL);
 126                 if (ret) break;
 127         }
 128
 129         close(fd);
 130         return ret;
 131 }
 132
 133 #ifdef HAVE_NS_API_H
 134
 135 static NODE_STATUS_STRUCT *lookup_byaddr_backend(char *addr, int *count)
 136 {
 137         int fd;
 138         struct in_addr  ip;
 139         struct nmb_name nname;
 140         NODE_STATUS_STRUCT *status;
 141
 142         if (!initialised) {
 143                 nss_wins_init();
 144         }
 145
 146         fd = wins_lookup_open_socket_in();
 147         if (fd == -1)
 148                 return NULL;
 149
 150         make_nmb_name(&nname, "*", 0);
 151         ip = *interpret_addr2(addr);
 152         status = node_status_query(fd,&nname,ip, count, NULL);
 153
 154         close(fd);
 155         return status;
 156 }
 157
 158 /* IRIX version */
 159
 160 int init(void)
 161 {
 162         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
 163         nss_wins_init();
 164         return NSD_OK;
 165 }
 166
 167 int lookup(nsd_file_t *rq)
 168 {
 169         char *map;
 170         char *key;
 171         char *addr;
 172         struct in_addr *ip_list;
 173         NODE_STATUS_STRUCT *status;
 174         int i, count, len, size;
 175         char response[1024];
 176         BOOL found = False;
 177
 178         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 179         if (! rq)
 180                 return NSD_ERROR;
 181
 182         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 183         if (! map) {
 184                 rq->f_status = NS_FATAL;
 185                 return NSD_ERROR;
 186         }
 187
 188         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 189         if (! key || ! *key) {
 190                 rq->f_status = NS_FATAL;
 191                 return NSD_ERROR;
 192         }
 193
 194         response[0] = '\0';
 195         len = sizeof(response) - 2;
 196
 197         /*
 198          * response needs to be a string of the following format
 199          * ip_address[ ip_address]*\tname[ alias]*
 200          */
 201         if (StrCaseCmp(map,"hosts.byaddr") == 0) {
 202                 if ( status = lookup_byaddr_backend(key, &count)) {
 203                     size = strlen(key) + 1;
 204                     if (size > len) {
 205                         free(status);
 206                         return NSD_ERROR;
 207                     }
 208                     len -= size;
 209                     strncat(response,key,size);
 210                     strncat(response,"\t",1);
 211                     for (i = 0; i < count; i++) {
 212                         /* ignore group names */
 213                         if (status[i].flags & 0x80) continue;
 214                         if (status[i].type == 0x20) {
 215                                 size = sizeof(status[i].name) + 1;
 216                                 if (size > len) {
 217                                     free(status);
 218                                     return NSD_ERROR;
 219                                 }
 220                                 len -= size;
 221                                 strncat(response, status[i].name, size);
 222                                 strncat(response, " ", 1);
 223                                 found = True;
 224                         }
 225                     }
 226                     response[strlen(response)-1] = '\n';
 227                     free(status);
 228                 }
 229         } else if (StrCaseCmp(map,"hosts.byname") == 0) {
 230             if (ip_list = lookup_byname_backend(key, &count)) {
 231                 for (i = count; i ; i--) {
 232                     addr = inet_ntoa(ip_list[i-1]);
 233                     size = strlen(addr) + 1;
 234                     if (size > len) {
 235                         free(ip_list);
 236                         return NSD_ERROR;
 237                     }
 238                     len -= size;
 239                     if (i != 0)
 240                         response[strlen(response)-1] = ' ';
 241                     strncat(response,addr,size);
 242                     strncat(response,"\t",1);
 243                 }
 244                 size = strlen(key) + 1;
 245                 if (size > len) {
 246                     free(ip_list);
 247                     return NSD_ERROR;
 248                 }
 249                 strncat(response,key,size);
 250                 strncat(response,"\n",1);
 251                 found = True;
 252                 free(ip_list);
 253             }
 254         }
 255
 256         if (found) {
 257             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 258             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 259             return NSD_OK;
 260         }
 261         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 262         rq->f_status = NS_NOTFOUND;
 263         return NSD_NEXT;
 264 }
 265
 266 #else
 267
 268 /* Allocate some space from the nss static buffer.  The buffer and buflen
 269    are the pointers passed in by the C library to the _nss_*_*
 270    functions. */
 271
 272 static char *get_static(char **buffer, size_t *buflen, int len)
 273 {
 274         char *result;
 275
 276         /* Error check.  We return false if things aren't set up right, or
 277            there isn't enough buffer space left. */
 278
 279         if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
 280                 return NULL;
 281         }
 282
 283         /* Return an index into the static buffer */
 284
 285         result = *buffer;
 286         *buffer += len;
 287         *buflen -= len;
 288
 289         return result;
 290 }
 291
 292 /****************************************************************************
 293 gethostbyname() - we ignore any domain portion of the name and only
 294 handle names that are at most 15 characters long
 295   **************************************************************************/
 296 NSS_STATUS
 297 _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
 298                           char *buffer, size_t buflen, int *h_errnop)
 299 {
 300         struct in_addr *ip_list;
 301         int i, count;
 302         fstring name;
 303         size_t namelen;
 304
 305         memset(he, '\0', sizeof(*he));
 306         fstrcpy(name, hostname);
 307
 308         /* Do lookup */
 309
 310         ip_list = lookup_byname_backend(name, &count);
 311
 312         if (!ip_list)
 313                 return NSS_STATUS_NOTFOUND;
 314
 315         /* Copy h_name */
 316
 317         namelen = strlen(name) + 1;
 318
 319         if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL)
 320                 return NSS_STATUS_TRYAGAIN;
 321
 322         memcpy(he->h_name, name, namelen);
 323
 324         /* Copy h_addr_list, align to pointer boundary first */
 325
 326         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 327                 i = sizeof(char*) - i;
 328
 329         if (get_static(&buffer, &buflen, i) == NULL)
 330                 return NSS_STATUS_TRYAGAIN;
 331
 332         if ((he->h_addr_list = (char **)get_static(
 333                      &buffer, &buflen, (count + 1) * sizeof(char *))) == NULL)
 334                 return NSS_STATUS_TRYAGAIN;
 335
 336         for (i = 0; i < count; i++) {
 337                 if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
 338                                                      INADDRSZ)) == NULL)
 339                         return NSS_STATUS_TRYAGAIN;
 340                 memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
 341         }
 342
 343         he->h_addr_list[count] = NULL;
 344
 345         if (ip_list)
 346                 free(ip_list);
 347
 348         /* Set h_addr_type and h_length */
 349
 350         he->h_addrtype = AF_INET;
 351         he->h_length = INADDRSZ;
 352
 353         /* Set h_aliases */
 354
 355         if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
 356                 i = sizeof(char*) - i;
 357
 358         if (get_static(&buffer, &buflen, i) == NULL)
 359                 return NSS_STATUS_TRYAGAIN;
 360
 361         if ((he->h_aliases = (char **)get_static(
 362                      &buffer, &buflen, sizeof(char *))) == NULL)
 363                 return NSS_STATUS_TRYAGAIN;
 364
 365         he->h_aliases[0] = NULL;
 366
 367         return NSS_STATUS_SUCCESS;
 368 }
 369
 370
 371 NSS_STATUS
 372 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 373                            char *buffer, size_t buflen, int *h_errnop)
 374 {
 375         if(af!=AF_INET) {
 376                 *h_errnop = NO_DATA;
 377                 return NSS_STATUS_UNAVAIL;
 378         }
 379
 380         return _nss_wins_gethostbyname_r(
 381                 name, he, buffer, buflen, h_errnop);
 382 }
 383 #endif