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/* routines that interface with pluto to get policy information
* Copyright (C) 2003 Michael Richardson <mcr@freeswan.org>
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*
* RCSID $Id: policyquery.c,v 1.2.24.1 2005/07/26 01:51:36 ken Exp $
*/
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <openswan.h>
#include <openswan/ipsec_policy.h>
#include "libipsecpolicy.h"
static int policy_query_socket = -1;
static u_int32_t policy_seq = 1;
u_int32_t ipsec_policy_seq(void)
{
return ++policy_seq;
}
err_t ipsec_policy_init(void)
{
struct sockaddr_un sn;
if(policy_query_socket != -1) {
return NULL;
}
policy_query_socket = socket(PF_UNIX, SOCK_STREAM, 0);
if(policy_query_socket == -1) {
return "failed to open policy socket";
}
/* now connect it */
sn.sun_family = AF_UNIX;
strcpy(sn.sun_path, IPSEC_POLICY_SOCKET);
if(connect(policy_query_socket, (struct sockaddr *)&sn, sizeof(sn)) != 0) {
int saveerrno = errno;
close(policy_query_socket);
policy_query_socket=-1;
errno = saveerrno;
return "failed to connect policy socket";
}
/* okay, I think we are done */
return NULL;
}
err_t ipsec_policy_final(void)
{
if(policy_query_socket != -1) {
close(policy_query_socket);
policy_query_socket = -1;
}
return NULL;
}
err_t ipsec_policy_readmsg(int policysock,
unsigned char *buf,
size_t buflen)
{
struct ipsec_policy_msg_head ipmh;
if(read(policysock, &ipmh, sizeof(ipmh))
!= sizeof(ipmh)) {
return "read failed";
}
/* got the header, sanitize it, and find out how much more to read */
switch(ipmh.ipm_version) {
case IPSEC_POLICY_MSG_REVISION:
break;
default:
/* XXX go deal with older versions, error for now */
fprintf(stderr, "Bad magic header: %u\n", ipmh.ipm_version);
return "bad policy msg version magic";
}
if(ipmh.ipm_msg_len > buflen) {
return "buffer too small for this message";
}
buflen = ipmh.ipm_msg_len;
memcpy(buf, &ipmh, sizeof(ipmh));
buf += sizeof(ipmh);
buflen -= sizeof(ipmh);
if(read(policysock, buf, buflen) != buflen) {
return "short read from socket";
}
return NULL;
}
err_t ipsec_policy_sendrecv(unsigned char *buf,
size_t buflen)
{
err_t ret;
ipsec_policy_init();
if(write(policy_query_socket, buf, buflen)
!= buflen) {
return "write failed";
}
ret = ipsec_policy_readmsg(policy_query_socket,
buf, buflen);
ipsec_policy_final();
return ret;
}
err_t ipsec_policy_lookup(int fd, struct ipsec_policy_cmd_query *result)
{
int len;
/* clear it out */
memset(result, 0, sizeof(*result));
/* setup it up */
result->head.ipm_version = IPSEC_POLICY_MSG_REVISION;
result->head.ipm_msg_len = sizeof(*result);
result->head.ipm_msg_type = IPSEC_CMD_QUERY_HOSTPAIR;
result->head.ipm_msg_seq = ipsec_policy_seq();
/* suck out the data on the sockets */
len = sizeof(result->query_local);
if(getsockname(fd, (struct sockaddr *)&result->query_local, &len) != 0) {
return "getsockname failed";
}
len = sizeof(result->query_remote);
if(getpeername(fd, (struct sockaddr *)&result->query_remote, &len) != 0) {
return "getpeername failed";
}
return ipsec_policy_sendrecv((unsigned char *)result, sizeof(*result));
}
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