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 #define NO_SYSLOG
  23
  24 #include "includes.h"
  25 #ifdef HAVE_NS_API_H
  26 #undef VOLATILE
  27
  28 #include <ns_daemon.h>
  29 #endif
  30
  31 #ifndef INADDRSZ
  32 #define INADDRSZ 4
  33 #endif
  34
  35 static int initialised;
  36
  37 extern BOOL AllowDebugChange;
  38
  39 /* Use our own create socket code so we don't recurse.... */
  40
  41 static int wins_lookup_open_socket_in(void)
  42 {
  43         struct sockaddr_in sock;
  44         int val=1;
  45         int res;
  46
  47         memset((char *)&sock,'\0',sizeof(sock));
  48
  49 #ifdef HAVE_SOCK_SIN_LEN
  50         sock.sin_len = sizeof(sock);
  51 #endif
  52         sock.sin_port = 0;
  53         sock.sin_family = AF_INET;
  54         sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
  55         res = socket(AF_INET, SOCK_DGRAM, 0);
  56         if (res == -1)
  57                 return -1;
  58
  59         setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
  60 #ifdef SO_REUSEPORT
  61         setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
  62 #endif /* SO_REUSEPORT */
  63
  64         /* now we've got a socket - we need to bind it */
  65
  66         if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
  67                 close(res);
  68                 return(-1);
  69         }
  70
  71         set_socket_options(res,"SO_BROADCAST");
  72
  73         return res;
  74 }
  75
  76
  77 static void nss_wins_init(void)
  78 {
  79         initialised = 1;
  80         DEBUGLEVEL = 0;
  81         AllowDebugChange = False;
  82
  83         /* needed for lp_xx() functions */
  84         charset_initialise();
  85
  86         TimeInit();
  87         setup_logging("nss_wins",False);
  88         lp_load(CONFIGFILE,True,False,False);
  89         load_interfaces();
  90         codepage_initialise(lp_client_code_page());
  91 }
  92
  93 static struct node_status *lookup_byaddr_backend(char *addr, int *count)
  94 {
  95         int fd;
  96         struct in_addr  ip;
  97         struct nmb_name nname;
  98         struct node_status *status;
  99
 100         if (!initialised) {
 101                 nss_wins_init();
 102         }
 103
 104         fd = wins_lookup_open_socket_in();
 105         if (fd == -1)
 106                 return NULL;
 107
 108         make_nmb_name(&nname, "*", 0);
 109         ip = *interpret_addr2(addr);
 110         status = node_status_query(fd,&nname,ip, count);
 111
 112         close(fd);
 113         return status;
 114 }
 115
 116 static struct in_addr *lookup_byname_backend(const char *name, int *count)
 117 {
 118         int fd;
 119         struct in_addr *ret = NULL;
 120         struct in_addr  p;
 121         int j, flags;
 122
 123         if (!initialised) {
 124                 nss_wins_init();
 125         }
 126
 127         *count = 0;
 128
 129         fd = wins_lookup_open_socket_in();
 130         if (fd == -1)
 131                 return NULL;
 132
 133         p = wins_srv_ip();
 134         if( !is_zero_ip(p) ) {
 135                 ret = name_query(fd,name,0x20,False,True, p, count, &flags);
 136                 goto out;
 137         }
 138
 139         if (lp_wins_support()) {
 140                 /* we are our own WINS server */
 141                 ret = name_query(fd,name,0x20,False,True, *interpret_addr2("127.0.0.1"), count, &flags);
 142                 goto out;
 143         }
 144
 145         /* uggh, we have to broadcast to each interface in turn */
 146         for (j=iface_count() - 1;
 147              j >= 0;
 148              j--) {
 149                 struct in_addr *bcast = iface_n_bcast(j);
 150                 ret = name_query(fd,name,0x20,True,True,*bcast,count, &flags);
 151                 if (ret) break;
 152         }
 153
 154  out:
 155
 156         close(fd);
 157         return ret;
 158 }
 159
 160
 161 #ifdef HAVE_NS_API_H
 162 /* IRIX version */
 163
 164 int init(void)
 165 {
 166         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
 167         nss_wins_init();
 168         return NSD_OK;
 169 }
 170
 171 int lookup(nsd_file_t *rq)
 172 {
 173         char *map;
 174         char *key;
 175         char *addr;
 176         struct in_addr *ip_list;
 177         struct node_status *status;
 178         int i, count, len, size;
 179         char response[1024];
 180         BOOL found = False;
 181
 182         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 183         if (! rq)
 184                 return NSD_ERROR;
 185
 186         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 187         if (! map) {
 188                 rq->f_status = NS_FATAL;
 189                 return NSD_ERROR;
 190         }
 191
 192         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 193         if (! key || ! *key) {
 194                 rq->f_status = NS_FATAL;
 195                 return NSD_ERROR;
 196         }
 197
 198         response[0] = '\0';
 199         len = sizeof(response) - 2;
 200
 201         /*
 202          * response needs to be a string of the following format
 203          * ip_address[ ip_address]*\tname[ alias]*
 204          */
 205         if (strcasecmp(map,"hosts.byaddr") == 0) {
 206                 if ( status = lookup_byaddr_backend(key, &count)) {
 207                     size = strlen(key) + 1;
 208                     if (size > len) {
 209                         free(status);
 210                         return NSD_ERROR;
 211                     }
 212                     len -= size;
 213                     strncat(response,key,size);
 214                     strncat(response,"\t",1);
 215                     for (i = 0; i < count; i++) {
 216                         /* ignore group names */
 217                         if (status[i].flags & 0x80) continue;
 218                         if (status[i].type == 0x20) {
 219                                 size = sizeof(status[i].name) + 1;
 220                                 if (size > len) {
 221                                     free(status);
 222                                     return NSD_ERROR;
 223                                 }
 224                                 len -= size;
 225                                 strncat(response, status[i].name, size);
 226                                 strncat(response, " ", 1);
 227                                 found = True;
 228                         }
 229                     }
 230                     response[strlen(response)-1] = '\n';
 231                     free(status);
 232                 }
 233         } else if (strcasecmp(map,"hosts.byname") == 0) {
 234             if (ip_list = lookup_byname_backend(key, &count)) {
 235                 for (i = count; i ; i--) {
 236                     addr = inet_ntoa(ip_list[i-1]);
 237                     size = strlen(addr) + 1;
 238                     if (size > len) {
 239                         free(ip_list);
 240                         return NSD_ERROR;
 241                     }
 242                     len -= size;
 243                     if (i != 0)
 244                         response[strlen(response)-1] = ' ';
 245                     strncat(response,addr,size);
 246                     strncat(response,"\t",1);
 247                 }
 248                 size = strlen(key) + 1;
 249                 if (size > len) {
 250                     free(ip_list);
 251                     return NSD_ERROR;
 252                 }
 253                 strncat(response,key,size);
 254                 strncat(response,"\n",1);
 255                 found = True;
 256                 free(ip_list);
 257             }
 258         }
 259
 260         if (found) {
 261             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 262             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 263             return NSD_OK;
 264         }
 265         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 266         rq->f_status = NS_NOTFOUND;
 267         return NSD_NEXT;
 268 }
 269
 270 #else
 271 /****************************************************************************
 272 gethostbyname() - we ignore any domain portion of the name and only
 273 handle names that are at most 15 characters long
 274   **************************************************************************/
 275 NSS_STATUS
 276 _nss_wins_gethostbyname_r(const char *name, struct hostent *he,
 277                           char *buffer, size_t buflen, int *errnop,
 278                           int *h_errnop)
 279 {
 280         char **host_addresses;
 281         struct in_addr *ip_list;
 282         int i, count;
 283         size_t namelen = strlen(name) + 1;
 284
 285         memset(he, '\0', sizeof(*he));
 286
 287         ip_list = lookup_byname_backend(name, &count);
 288         if (!ip_list) {
 289                 return NSS_STATUS_NOTFOUND;
 290         }
 291
 292         if (buflen < namelen + (2*count+1)*INADDRSZ) {
 293                 /* no ENOMEM error type?! */
 294                 return NSS_STATUS_NOTFOUND;
 295         }
 296
 297
 298         host_addresses = (char **)buffer;
 299         he->h_addr_list = host_addresses;
 300         host_addresses[count] = NULL;
 301         buffer += (count + 1) * INADDRSZ;
 302         buflen += (count + 1) * INADDRSZ;
 303         he->h_addrtype = AF_INET;
 304         he->h_length = INADDRSZ;
 305
 306         for (i=0;i<count;i++) {
 307                 memcpy(buffer, &ip_list[i].s_addr, INADDRSZ);
 308                 *host_addresses = buffer;
 309                 buffer += INADDRSZ;
 310                 buflen -= INADDRSZ;
 311                 host_addresses++;
 312         }
 313
 314         if (ip_list)
 315                 free(ip_list);
 316
 317         memcpy(buffer, name, namelen);
 318         he->h_name = buffer;
 319
 320         return NSS_STATUS_SUCCESS;
 321 }
 322
 323 NSS_STATUS
 324 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 325                                 char *buffer, size_t buflen, int *errnop,
 326                                 int *h_errnop)
 327 {
 328         if(af!=AF_INET) {
 329                 *h_errnop = NO_DATA;
 330                 *errnop = EAFNOSUPPORT;
 331                 return NSS_STATUS_UNAVAIL;
 332         }
 333
 334         return _nss_wins_gethostbyname_r(name,he,buffer,buflen,errnop,h_errnop);
 335 }
 336
 337
 338
 339 #endif