mirror of
https://github.com/samba-team/samba.git
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e674581416
(This used to be commit 20c5f042e3
)
325 lines
7.0 KiB
C
325 lines
7.0 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 2.0
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a WINS nsswitch module
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Copyright (C) Andrew Tridgell 1999
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define NO_SYSLOG
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#include "includes.h"
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#ifdef HAVE_NS_API_H
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#undef VOLATILE
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#include <ns_daemon.h>
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#endif
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#ifndef INADDRSZ
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#define INADDRSZ 4
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#endif
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static int initialised;
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extern BOOL AllowDebugChange;
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/* Use our own create socket code so we don't recurse.... */
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static int wins_lookup_open_socket_in(void)
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{
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struct sockaddr_in sock;
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int val=1;
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int res;
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memset((char *)&sock,'\0',sizeof(sock));
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#ifdef HAVE_SOCK_SIN_LEN
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sock.sin_len = sizeof(sock);
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#endif
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sock.sin_port = 0;
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sock.sin_family = AF_INET;
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sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
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res = socket(AF_INET, SOCK_DGRAM, 0);
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if (res == -1)
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return -1;
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setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
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#ifdef SO_REUSEPORT
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setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
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#endif /* SO_REUSEPORT */
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/* now we've got a socket - we need to bind it */
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if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
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close(res);
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return(-1);
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}
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set_socket_options(res,"SO_BROADCAST");
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return res;
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}
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static void nss_wins_init(void)
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{
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initialised = 1;
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DEBUGLEVEL = 0;
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AllowDebugChange = False;
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/* needed for lp_xx() functions */
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charset_initialise();
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TimeInit();
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setup_logging("nss_wins",False);
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lp_load(dyn_CONFIGFILE,True,False,False);
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load_interfaces();
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codepage_initialise(lp_client_code_page());
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}
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static struct node_status *lookup_byaddr_backend(char *addr, int *count)
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{
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int fd;
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struct in_addr ip;
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struct nmb_name nname;
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struct node_status *status;
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if (!initialised) {
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nss_wins_init();
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}
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fd = wins_lookup_open_socket_in();
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if (fd == -1)
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return NULL;
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make_nmb_name(&nname, "*", 0);
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ip = *interpret_addr2(addr);
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status = node_status_query(fd,&nname,ip, count);
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close(fd);
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return status;
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}
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static struct in_addr *lookup_byname_backend(const char *name, int *count)
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{
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int fd;
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struct in_addr *ret = NULL;
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struct in_addr p;
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int j;
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if (!initialised) {
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nss_wins_init();
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}
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*count = 0;
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fd = wins_lookup_open_socket_in();
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if (fd == -1)
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return NULL;
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p = wins_srv_ip();
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if( !is_zero_ip(p) ) {
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ret = name_query(fd,name,0x20,False,True, p, count);
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goto out;
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}
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if (lp_wins_support()) {
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/* we are our own WINS server */
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ret = name_query(fd,name,0x20,False,True, *interpret_addr2("127.0.0.1"), count);
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goto out;
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}
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/* uggh, we have to broadcast to each interface in turn */
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for (j=iface_count() - 1;
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j >= 0;
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j--) {
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struct in_addr *bcast = iface_n_bcast(j);
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ret = name_query(fd,name,0x20,True,True,*bcast,count);
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if (ret) break;
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}
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out:
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close(fd);
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return ret;
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}
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#ifdef HAVE_NS_API_H
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/* IRIX version */
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int init(void)
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{
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nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
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nss_wins_init();
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return NSD_OK;
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}
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int lookup(nsd_file_t *rq)
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{
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char *map;
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char *key;
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char *addr;
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struct in_addr *ip_list;
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struct node_status *status;
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int i, count, len, size;
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char response[1024];
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BOOL found = False;
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nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
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if (! rq)
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return NSD_ERROR;
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map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
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if (! map) {
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rq->f_status = NS_FATAL;
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return NSD_ERROR;
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}
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key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
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if (! key || ! *key) {
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rq->f_status = NS_FATAL;
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return NSD_ERROR;
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}
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response[0] = '\0';
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len = sizeof(response) - 2;
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/*
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* response needs to be a string of the following format
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* ip_address[ ip_address]*\tname[ alias]*
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*/
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if (strcasecmp(map,"hosts.byaddr") == 0) {
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if ( status = lookup_byaddr_backend(key, &count)) {
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size = strlen(key) + 1;
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if (size > len) {
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free(status);
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return NSD_ERROR;
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}
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len -= size;
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strncat(response,key,size);
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strncat(response,"\t",1);
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for (i = 0; i < count; i++) {
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/* ignore group names */
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if (status[i].flags & 0x80) continue;
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if (status[i].type == 0x20) {
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size = sizeof(status[i].name) + 1;
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if (size > len) {
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free(status);
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return NSD_ERROR;
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}
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len -= size;
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strncat(response, status[i].name, size);
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strncat(response, " ", 1);
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found = True;
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}
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}
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response[strlen(response)-1] = '\n';
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free(status);
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}
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} else if (strcasecmp(map,"hosts.byname") == 0) {
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if (ip_list = lookup_byname_backend(key, &count)) {
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for (i = count; i ; i--) {
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addr = inet_ntoa(ip_list[i-1]);
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size = strlen(addr) + 1;
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if (size > len) {
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free(ip_list);
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return NSD_ERROR;
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}
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len -= size;
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if (i != 0)
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response[strlen(response)-1] = ' ';
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strncat(response,addr,size);
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strncat(response,"\t",1);
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}
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size = strlen(key) + 1;
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if (size > len) {
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free(ip_list);
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return NSD_ERROR;
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}
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strncat(response,key,size);
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strncat(response,"\n",1);
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found = True;
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free(ip_list);
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}
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}
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if (found) {
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nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
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nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
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return NSD_OK;
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}
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nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
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rq->f_status = NS_NOTFOUND;
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return NSD_NEXT;
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}
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#else
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/****************************************************************************
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gethostbyname() - we ignore any domain portion of the name and only
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handle names that are at most 15 characters long
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**************************************************************************/
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NSS_STATUS
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_nss_wins_gethostbyname_r(const char *name, struct hostent *he,
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char *buffer, size_t buflen, int *errnop,
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int *h_errnop)
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{
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char **host_addresses;
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struct in_addr *ip_list;
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int i, count;
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size_t namelen = strlen(name) + 1;
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memset(he, '\0', sizeof(*he));
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ip_list = lookup_byname_backend(name, &count);
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if (!ip_list) {
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return NSS_STATUS_NOTFOUND;
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}
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if (buflen < namelen + (2*count+1)*INADDRSZ) {
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/* no ENOMEM error type?! */
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return NSS_STATUS_NOTFOUND;
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}
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host_addresses = (char **)buffer;
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he->h_addr_list = host_addresses;
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host_addresses[count] = NULL;
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buffer += (count + 1) * INADDRSZ;
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buflen += (count + 1) * INADDRSZ;
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he->h_addrtype = AF_INET;
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he->h_length = INADDRSZ;
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for (i=0;i<count;i++) {
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memcpy(buffer, &ip_list[i].s_addr, INADDRSZ);
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*host_addresses = buffer;
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buffer += INADDRSZ;
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buflen -= INADDRSZ;
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host_addresses++;
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}
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if (ip_list)
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free(ip_list);
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memcpy(buffer, name, namelen);
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he->h_name = buffer;
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return NSS_STATUS_SUCCESS;
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}
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#endif
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