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wins.c

/* 
   Unix SMB/CIFS implementation.
   a WINS nsswitch module 
   Copyright (C) Andrew Tridgell 1999
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   
*/

#define NO_SYSLOG

#include "includes.h"
#ifdef HAVE_NS_API_H
#undef VOLATILE

#include <ns_daemon.h>
#endif

#ifndef INADDRSZ
#define INADDRSZ 4
#endif

static int initialised;

extern BOOL AllowDebugChange;

/* Use our own create socket code so we don't recurse.... */

static int wins_lookup_open_socket_in(void)
{
      struct sockaddr_in sock;
      int val=1;
      int res;

      memset((char *)&sock,'\0',sizeof(sock));

#ifdef HAVE_SOCK_SIN_LEN
      sock.sin_len = sizeof(sock);
#endif
      sock.sin_port = 0;
      sock.sin_family = AF_INET;
      sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
      res = socket(AF_INET, SOCK_DGRAM, 0);
      if (res == -1)
            return -1;

      setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
#ifdef SO_REUSEPORT
      setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
#endif /* SO_REUSEPORT */

      /* now we've got a socket - we need to bind it */

      if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
            close(res);
            return(-1);
      }

      set_socket_options(res,"SO_BROADCAST");

      return res;
}


static void nss_wins_init(void)
{
      initialised = 1;
      DEBUGLEVEL = 0;
      AllowDebugChange = False;

      /* needed for lp_xx() functions */
      charset_initialise();

      TimeInit();
      setup_logging("nss_wins",False);
      lp_load(CONFIGFILE,True,False,False);
      load_interfaces();
      codepage_initialise(lp_client_code_page());
}

static struct node_status *lookup_byaddr_backend(char *addr, int *count)
{
      int fd;
      struct in_addr  ip;
      struct nmb_name nname;
      struct node_status *status;

      if (!initialised) {
            nss_wins_init();
      }

      fd = wins_lookup_open_socket_in();
      if (fd == -1)
            return NULL;

      make_nmb_name(&nname, "*", 0);
      ip = *interpret_addr2(addr);
      status = node_status_query(fd,&nname,ip, count);

      close(fd);
      return status;
}

static struct in_addr *lookup_byname_backend(const char *name, int *count)
{
      int fd;
      struct in_addr *ret = NULL;
      struct in_addr  p;
      int j, flags;

      if (!initialised) {
            nss_wins_init();
      }

      *count = 0;

      fd = wins_lookup_open_socket_in();
      if (fd == -1)
            return NULL;

      p = wins_srv_ip();
      if( !is_zero_ip(p) ) {
            ret = name_query(fd,name,0x20,False,True, p, count, &flags);
            goto out;
      }

      if (lp_wins_support()) {
            /* we are our own WINS server */
            ret = name_query(fd,name,0x20,False,True, *interpret_addr2("127.0.0.1"), count, &flags);
            goto out;
      }

      /* uggh, we have to broadcast to each interface in turn */
      for (j=iface_count() - 1;
           j >= 0;
           j--) {
            struct in_addr *bcast = iface_n_bcast(j);
            ret = name_query(fd,name,0x20,True,True,*bcast,count, &flags);
            if (ret) break;
      }

 out:

      close(fd);
      return ret;
}


#ifdef HAVE_NS_API_H
/* IRIX version */

int init(void)
{
      nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
      nss_wins_init();
      return NSD_OK;
}

int lookup(nsd_file_t *rq)
{
      char *map;
      char *key;
      char *addr;
      struct in_addr *ip_list;
      struct node_status *status;
      int i, count, len, size;
      char response[1024];
      BOOL found = False;

      nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
      if (! rq) 
            return NSD_ERROR;

      map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
      if (! map) {
            rq->f_status = NS_FATAL;
            return NSD_ERROR;
      }

      key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
      if (! key || ! *key) {
            rq->f_status = NS_FATAL;
            return NSD_ERROR;
      }

      response[0] = '\0';
      len = sizeof(response) - 2;

      /* 
       * response needs to be a string of the following format
       * ip_address[ ip_address]*\tname[ alias]*
       */
      if (strcasecmp(map,"hosts.byaddr") == 0) {
            if ( status = lookup_byaddr_backend(key, &count)) {
                size = strlen(key) + 1;
                if (size > len) {
                  free(status);
                  return NSD_ERROR;
                }
                len -= size;
                strncat(response,key,size);
                strncat(response,"\t",1);
                for (i = 0; i < count; i++) {
                  /* ignore group names */
                  if (status[i].flags & 0x80) continue;
                  if (status[i].type == 0x20) {
                        size = sizeof(status[i].name) + 1;
                        if (size > len) {
                            free(status);
                            return NSD_ERROR;
                        }
                        len -= size;
                        strncat(response, status[i].name, size);
                        strncat(response, " ", 1);
                        found = True;
                  }
                }
                response[strlen(response)-1] = '\n';
                free(status);
            }
      } else if (strcasecmp(map,"hosts.byname") == 0) {
          if (ip_list = lookup_byname_backend(key, &count)) {
            for (i = count; i ; i--) {
                addr = inet_ntoa(ip_list[i-1]);
                size = strlen(addr) + 1;
                if (size > len) {
                  free(ip_list);
                  return NSD_ERROR;
                }
                len -= size;
                if (i != 0)
                  response[strlen(response)-1] = ' ';
                strncat(response,addr,size);
                strncat(response,"\t",1);
            }
            size = strlen(key) + 1;
            if (size > len) {
                free(ip_list);
                return NSD_ERROR;
            }   
            strncat(response,key,size);
            strncat(response,"\n",1);
            found = True;
            free(ip_list);
          }
      }

      if (found) {
          nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
          nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
          return NSD_OK;
      }
      nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
      rq->f_status = NS_NOTFOUND;
      return NSD_NEXT;
}

#else
/****************************************************************************
gethostbyname() - we ignore any domain portion of the name and only
handle names that are at most 15 characters long
  **************************************************************************/
NSS_STATUS
_nss_wins_gethostbyname_r(const char *name, struct hostent *he,
                    char *buffer, size_t buflen, int *errnop,
                    int *h_errnop)
{
      char **host_addresses;
      struct in_addr *ip_list;
      int i, count;
      size_t namelen = strlen(name) + 1;
            
      memset(he, '\0', sizeof(*he));

      ip_list = lookup_byname_backend(name, &count);
      if (!ip_list) {
            return NSS_STATUS_NOTFOUND;
      }

      if (buflen < namelen + (2*count+1)*INADDRSZ) {
            /* no ENOMEM error type?! */
            return NSS_STATUS_NOTFOUND;
      }


      host_addresses = (char **)buffer;
      he->h_addr_list = host_addresses;
      host_addresses[count] = NULL;
      buffer += (count + 1) * INADDRSZ;
      buflen += (count + 1) * INADDRSZ;
      he->h_addrtype = AF_INET;
      he->h_length = INADDRSZ;

      for (i=0;i<count;i++) {
            memcpy(buffer, &ip_list[i].s_addr, INADDRSZ);
            *host_addresses = buffer;
            buffer += INADDRSZ;
            buflen -= INADDRSZ;
            host_addresses++;
      }

      if (ip_list)
            free((char *)ip_list);

      memcpy(buffer, name, namelen);
      he->h_name = buffer;

      return NSS_STATUS_SUCCESS;
}

NSS_STATUS
_nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
                        char *buffer, size_t buflen, int *errnop,
                        int *h_errnop)
{
      if(af!=AF_INET) {
            *h_errnop = NO_DATA;
            *errnop = EAFNOSUPPORT;
            return NSS_STATUS_UNAVAIL;
      }

      return _nss_wins_gethostbyname_r(name,he,buffer,buflen,errnop,h_errnop);
}



#endif

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