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         TimeInit();
  84         setup_logging("nss_wins",False);
  85         lp_load(dyn_CONFIGFILE,True,False,False);
  86         load_interfaces();
  87 }
  88
  89 static struct node_status *lookup_byaddr_backend(char *addr, int *count)
  90 {
  91         int fd;
  92         struct in_addr  ip;
  93         struct nmb_name nname;
  94         struct node_status *status;
  95
  96         if (!initialised) {
  97                 nss_wins_init();
  98         }
  99
 100         fd = wins_lookup_open_socket_in();
 101         if (fd == -1)
 102                 return NULL;
 103
 104         make_nmb_name(&nname, "*", 0);
 105         ip = *interpret_addr2(addr);
 106         status = node_status_query(fd,&nname,ip, count);
 107
 108         close(fd);
 109         return status;
 110 }
 111
 112 static struct in_addr *lookup_byname_backend(const char *name, int *count)
 113 {
 114         int fd = -1;
 115         struct in_addr *ret = NULL;
 116         struct in_addr  p;
 117         int j, flags = 0;
 118
 119         if (!initialised) {
 120                 nss_wins_init();
 121         }
 122
 123         *count = 0;
 124
 125         /* always try with wins first */
 126         if (resolve_wins(name,0x20,&ret,count)) {
 127                 return ret;
 128         }
 129
 130         fd = wins_lookup_open_socket_in();
 131         if (fd == -1) {
 132                 return NULL;
 133         }
 134
 135         /* uggh, we have to broadcast to each interface in turn */
 136         for (j=iface_count() - 1;j >= 0;j--) {
 137                 struct in_addr *bcast = iface_n_bcast(j);
 138                 ret = name_query(fd,name,0x20,True,True,*bcast,count, &flags, NULL);
 139                 if (ret) break;
 140         }
 141
 142 out:
 143         close(fd);
 144         return ret;
 145 }
 146
 147
 148 #ifdef HAVE_NS_API_H
 149 /* IRIX version */
 150
 151 int init(void)
 152 {
 153         nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
 154         nss_wins_init();
 155         return NSD_OK;
 156 }
 157
 158 int lookup(nsd_file_t *rq)
 159 {
 160         char *map;
 161         char *key;
 162         char *addr;
 163         struct in_addr *ip_list;
 164         struct node_status *status;
 165         int i, count, len, size;
 166         char response[1024];
 167         BOOL found = False;
 168
 169         nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
 170         if (! rq)
 171                 return NSD_ERROR;
 172
 173         map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
 174         if (! map) {
 175                 rq->f_status = NS_FATAL;
 176                 return NSD_ERROR;
 177         }
 178
 179         key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
 180         if (! key || ! *key) {
 181                 rq->f_status = NS_FATAL;
 182                 return NSD_ERROR;
 183         }
 184
 185         response[0] = '\0';
 186         len = sizeof(response) - 2;
 187
 188         /*
 189          * response needs to be a string of the following format
 190          * ip_address[ ip_address]*\tname[ alias]*
 191          */
 192         if (strcasecmp(map,"hosts.byaddr") == 0) {
 193                 if ( status = lookup_byaddr_backend(key, &count)) {
 194                     size = strlen(key) + 1;
 195                     if (size > len) {
 196                         free(status);
 197                         return NSD_ERROR;
 198                     }
 199                     len -= size;
 200                     strncat(response,key,size);
 201                     strncat(response,"\t",1);
 202                     for (i = 0; i < count; i++) {
 203                         /* ignore group names */
 204                         if (status[i].flags & 0x80) continue;
 205                         if (status[i].type == 0x20) {
 206                                 size = sizeof(status[i].name) + 1;
 207                                 if (size > len) {
 208                                     free(status);
 209                                     return NSD_ERROR;
 210                                 }
 211                                 len -= size;
 212                                 strncat(response, status[i].name, size);
 213                                 strncat(response, " ", 1);
 214                                 found = True;
 215                         }
 216                     }
 217                     response[strlen(response)-1] = '\n';
 218                     free(status);
 219                 }
 220         } else if (strcasecmp(map,"hosts.byname") == 0) {
 221             if (ip_list = lookup_byname_backend(key, &count)) {
 222                 for (i = count; i ; i--) {
 223                     addr = inet_ntoa(ip_list[i-1]);
 224                     size = strlen(addr) + 1;
 225                     if (size > len) {
 226                         free(ip_list);
 227                         return NSD_ERROR;
 228                     }
 229                     len -= size;
 230                     if (i != 0)
 231                         response[strlen(response)-1] = ' ';
 232                     strncat(response,addr,size);
 233                     strncat(response,"\t",1);
 234                 }
 235                 size = strlen(key) + 1;
 236                 if (size > len) {
 237                     free(ip_list);
 238                     return NSD_ERROR;
 239                 }
 240                 strncat(response,key,size);
 241                 strncat(response,"\n",1);
 242                 found = True;
 243                 free(ip_list);
 244             }
 245         }
 246
 247         if (found) {
 248             nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
 249             nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
 250             return NSD_OK;
 251         }
 252         nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
 253         rq->f_status = NS_NOTFOUND;
 254         return NSD_NEXT;
 255 }
 256
 257 #else
 258 /****************************************************************************
 259 gethostbyname() - we ignore any domain portion of the name and only
 260 handle names that are at most 15 characters long
 261   **************************************************************************/
 262 NSS_STATUS
 263 _nss_wins_gethostbyname_r(const char *name, struct hostent *he,
 264                           char *buffer, size_t buflen, int *errnop,
 265                           int *h_errnop)
 266 {
 267         char **host_addresses;
 268         struct in_addr *ip_list;
 269         int i, count;
 270         size_t namelen = strlen(name) + 1;
 271
 272         memset(he, '\0', sizeof(*he));
 273
 274         ip_list = lookup_byname_backend(name, &count);
 275         if (!ip_list) {
 276                 return NSS_STATUS_NOTFOUND;
 277         }
 278
 279         if (buflen < namelen + (2*count+1)*INADDRSZ) {
 280                 /* no ENOMEM error type?! */
 281                 return NSS_STATUS_NOTFOUND;
 282         }
 283
 284
 285         host_addresses = (char **)buffer;
 286         he->h_addr_list = host_addresses;
 287         host_addresses[count] = NULL;
 288         buffer += (count + 1) * INADDRSZ;
 289         buflen += (count + 1) * INADDRSZ;
 290         he->h_addrtype = AF_INET;
 291         he->h_length = INADDRSZ;
 292
 293         for (i=0;i<count;i++) {
 294                 memcpy(buffer, &ip_list[i].s_addr, INADDRSZ);
 295                 *host_addresses = buffer;
 296                 buffer += INADDRSZ;
 297                 buflen -= INADDRSZ;
 298                 host_addresses++;
 299         }
 300
 301         if (ip_list)
 302                 free(ip_list);
 303
 304         memcpy(buffer, name, namelen);
 305         he->h_name = buffer;
 306
 307         return NSS_STATUS_SUCCESS;
 308 }
 309
 310
 311 NSS_STATUS
 312 _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
 313                                 char *buffer, size_t buflen, int *errnop,
 314                                 int *h_errnop)
 315 {
 316         if(af!=AF_INET) {
 317                 *h_errnop = NO_DATA;
 318                 *errnop = EAFNOSUPPORT;
 319                 return NSS_STATUS_UNAVAIL;
 320         }
 321
 322         return _nss_wins_gethostbyname_r(name,he,buffer,buflen,errnop,h_errnop);
 323 }
 324 #endif