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/*
Unix SMB/Netbios implementation.
Version 2.0
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"
#include <nss.h>
extern int DEBUGLEVEL;
#ifndef INADDRSZ
#define INADDRSZ 4
#endif
/* 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)
return(-1);
return res;
}
struct in_addr *lookup_backend(const char *name, int *count)
{
int fd;
static int initialised;
struct in_addr *ret;
struct in_addr p;
int j;
if (!initialised) {
initialised = 1;
DEBUGLEVEL = 0;
TimeInit();
setup_logging("nss_wins",True);
charset_initialise();
lp_load(CONFIGFILE,True,False,False);
load_interfaces();
}
*count = 0;
fd = wins_lookup_open_socket_in();
if (fd == -1)
return NULL;
set_socket_options(fd,"SO_BROADCAST");
/* The next four lines commented out by JHT
and replaced with the four lines following */
/* if( !zero_ip( wins_ip ) ) {
* ret = name_query( fd, name, 0x20, False, True, wins_src_ip(), count );
* goto out;
* }
*/
p = wins_srv_ip();
if( !zero_ip(p) ) {
ret = name_query(fd,name,0x20,False,True, p, count);
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);
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);
if (ret) break;
}
out:
close(fd);
return ret;
}
/****************************************************************************
gethostbyname() - we ignore any domain portion of the name and only
handle names that are at most 15 characters long
**************************************************************************/
enum 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_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(ip_list);
memcpy(buffer, name, namelen);
he->h_name = buffer;
return NSS_STATUS_SUCCESS;
}
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