firebird-mirror/src/utilities/relay.cpp

/*
 *	PROGRAM:	UNIX signal relay program
 *	MODULE:		relay.c
 *	DESCRIPTION:	Signal relay program
 *
 * The contents of this file are subject to the Interbase Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy
 * of the License at http://www.Inprise.com/IPL.html
 *
 * Software distributed under the License is distributed on an
 * "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code was created by Inprise Corporation
 * and its predecessors. Portions created by Inprise Corporation are
 * Copyright (C) Inprise Corporation.
 *
 * All Rights Reserved.
 * Contributor(s): ______________________________________.
 */

#include "../jrd/ib_stdio.h"
#include <sys/param.h>
#include <signal.h>

#include "../jrd/common.h"
#include "../jrd/license.h"

#include <stdlib.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifndef NOFILE
#define NOFILE		20
#endif


int CLIB_ROUTINE main( int argc, char **argv)
{
/**************************************
 *
 *	m a i n
 *
 **************************************
 *
 * Functional description
 *	Wait on a pipe for a message, then forward a signal.
 *
 **************************************/
	SLONG msg[3];
	int fd, n;
	TEXT **end, *p, c;

#ifndef DEBUG
	if (setreuid(0, 0) < 0)
		ib_printf("gds_relay: couldn't set uid to superuser\n");
	SETPGRP;
	signal(SIGINT, SIG_IGN);
	signal(SIGQUIT, SIG_IGN);
#endif

/* Get the file descriptor ID - if it is present - make sure it's valid */
	if (argc < 2 || (!(fd = atoi(argv[1])) && strcmp(argv[1], "0")))
		fd = -1;

	end = argv + argc;
	while (argv < end) {
		p = *argv++;
		if (*p++ == '-')
			while (c = *p++)
				switch (UPPER(c)) {
				case 'Z':
					ib_printf("Interbase relay version %s\n", GDS_VERSION);
					exit(FINI_OK);
				}
	}

	if (fd == -1)
		exit(FINI_OK);

/* Close all files, except for the pipe input */
	for (n = 0; n < NOFILE; n++)
#ifdef DEV_BUILD
		/* Don't close ib_stderr - we might need to report something */
		if ((n != fd) && (n != 2))
#else
		if (n != fd)
#endif
			close(n);

	while (read(fd, msg, sizeof(msg)) == sizeof(msg)) {
#ifdef DEV_BUILD
		/* This is #ifdef for DEV_BUILD just in case a V3 client will
		 * attempt communication with this V4 version.
		 */
		if (msg[2] != (msg[0] ^ msg[1])) {
			ib_fprintf(ib_stderr, "gds_relay received inconsistant message");
		}
#endif
		if (kill(msg[0], msg[1])) {
#ifdef DEV_BUILD
			ib_fprintf(ib_stderr, "gds_relay error on kill()");
#endif
		};
	}

	exit(FINI_OK);
}