/* 
   Unix SMB/CIFS implementation.

   Winbind daemon - WINS related functions

   Copyright (C) Andrew Tridgell 1999
   Copyright (C) Herb Lewis 2002
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "winbindd.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

/* 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;

	if (setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val))) {
		close(res);
		return -1;
	}
#ifdef SO_REUSEPORT
	if (setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val))) {
		close(res);
		return -1;
	}
#endif /* SO_REUSEPORT */

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

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

	set_socket_options(res,"SO_BROADCAST");

	return res;
}


static NODE_STATUS_STRUCT *lookup_byaddr_backend(const char *addr, int *count)
{
	int fd;
	struct sockaddr_storage ss;
	struct nmb_name nname;
	NODE_STATUS_STRUCT *status;

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

	make_nmb_name(&nname, "*", 0);
	if (!interpret_string_addr(&ss, addr, AI_NUMERICHOST)) {
		return NULL;
	}
	status = node_status_query(fd, &nname, &ss, count, NULL);

	close(fd);
	return status;
}

static struct sockaddr_storage *lookup_byname_backend(const char *name,
					int *count)
{
	int fd;
	struct ip_service *ret = NULL;
	struct sockaddr_storage *return_ss = NULL;
	int j, i, flags = 0;

	*count = 0;

	/* always try with wins first */
	if (NT_STATUS_IS_OK(resolve_wins(name,0x20,&ret,count))) {
		if ( *count == 0 )
			return NULL;
		if ( (return_ss = SMB_MALLOC_ARRAY(struct sockaddr_storage, *count)) == NULL ) {
			free( ret );
			return NULL;
		}

		/* copy the IP addresses */
		for ( i=0; i<(*count); i++ )
			return_ss[i] = ret[i].ss;

		free( ret );
		return return_ss;
	}

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

	/* uggh, we have to broadcast to each interface in turn */
	for (j=iface_count() - 1;
	     j >= 0;
	     j--) {
		const struct sockaddr_storage *bcast_ss = iface_n_bcast(j);
		if (!bcast_ss) {
			continue;
		}
		return_ss = name_query(fd,name,0x20,True,True,bcast_ss,count, &flags, NULL);
		if (return_ss) {
			break;
		}
	}

	close(fd);
	return return_ss;
}

/* Get hostname from IP  */

void winbindd_wins_byip(struct winbindd_cli_state *state)
{
	fstring response;
	int i, count, maxlen, size;
	NODE_STATUS_STRUCT *status;

	/* Ensure null termination */
	state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';

	DEBUG(3, ("[%5lu]: wins_byip %s\n", (unsigned long)state->pid,
		state->request.data.winsreq));

	*response = '\0';
	maxlen = sizeof(response) - 1;

	if ((status = lookup_byaddr_backend(state->request.data.winsreq, &count))){
	    size = strlen(state->request.data.winsreq);
	    if (size > maxlen) {
		SAFE_FREE(status);
		request_error(state);
		return;
	    }
	    fstrcat(response,state->request.data.winsreq);
	    fstrcat(response,"\t");
	    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) + strlen(response);
			if (size > maxlen) {
			    SAFE_FREE(status);
			    request_error(state);
			    return;
			}
			fstrcat(response, status[i].name);
			fstrcat(response, " ");
		}
	    }
	    /* make last character a newline */
	    response[strlen(response)-1] = '\n';
	    SAFE_FREE(status);
	}
	fstrcpy(state->response.data.winsresp,response);
	request_ok(state);
}

/* Get IP from hostname */

void winbindd_wins_byname(struct winbindd_cli_state *state)
{
	struct sockaddr_storage *ip_list = NULL;
	int i, count, maxlen, size;
	fstring response;
	char addr[INET6_ADDRSTRLEN];

	/* Ensure null termination */
	state->request.data.winsreq[sizeof(state->request.data.winsreq)-1]='\0';

	DEBUG(3, ("[%5lu]: wins_byname %s\n", (unsigned long)state->pid,
		state->request.data.winsreq));

	*response = '\0';
	maxlen = sizeof(response) - 1;

	if ((ip_list = lookup_byname_backend(state->request.data.winsreq,&count))){
		for (i = count; i ; i--) {
			print_sockaddr(addr, sizeof(addr), &ip_list[i-1]);
			size = strlen(addr);
			if (size > maxlen) {
				SAFE_FREE(ip_list);
				request_error(state);
				return;
			}
			if (i != 0) {
				/* Clear out the newline character */
				/* But only if there is something in there,
				otherwise we clobber something in the stack */
				if (strlen(response)) {
					response[strlen(response)-1] = ' ';
				}
			}
			fstrcat(response,addr);
			fstrcat(response,"\t");
		}
		size = strlen(state->request.data.winsreq) + strlen(response);
		if (size > maxlen) {
		    SAFE_FREE(ip_list);
		    request_error(state);
		    return;
		}
		fstrcat(response,state->request.data.winsreq);
		fstrcat(response,"\n");
		SAFE_FREE(ip_list);
	} else {
		request_error(state);
		return;
	}

	fstrcpy(state->response.data.winsresp,response);

	request_ok(state);
}