/* $Id: iprofd.c,v 1.4 1998/04/28 08:34:23 paul Exp $

 * Daemon for saving ttyIx-profiles to a file.
 *
 * Copyright 1994,95 by Fritz Elfert (fritz@wuemaus.franken.de)
 * Copyright 1995 Thinking Objects Software GmbH Wuerzburg
 *
 * This file is part of Isdn4Linux.
 *
 * 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, 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.
 *
 * $Log: iprofd.c,v $
 * Revision 1.4  1998/04/28 08:34:23  paul
 * Fixed compiler warnings from egcs.
 *
 * Revision 1.3  1998/04/24 09:19:23  paul
 * Ignore empty file when starting up instead of generating error message
 * about wrong signature, there is _no_ signature! iprofd writes new data
 * anyway in that case.
 *
 * Revision 1.2  1997/02/21 13:18:27  fritz
 * Reformatted, changed some error-messages.
 *
 * Revision 1.1  1997/02/17 00:09:12  fritz
 * New CVS tree
 *
 */

#define SIGNATURE "iprofd%02x"
#define SIGLEN 9

#include <sys/types.h>
#include <sys/fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <signal.h>
#include <linux/isdn.h>

typedef unsigned char uchar;

int isdnctrl_fd;
char *modemsettings;

#define BUFSZ ((ISDN_MODEM_ANZREG+ISDN_MSNLEN)*ISDN_MAX_CHANNELS)

void
dumpModem(int dummy)
{
	int fd;
	int len;
	char buffer[BUFSZ];
	char signature[SIGLEN];

	if ((len = ioctl(isdnctrl_fd, IIOCGETPRF, &buffer)) < 0) {
		perror("ioctl IIOCGETPRF");
		exit(-1);
	}
	fd = open(modemsettings, O_WRONLY | O_CREAT | O_TRUNC, 0644);
	if (fd < 0) {
		perror(modemsettings);
		exit(-1);
	}
	sprintf(signature, SIGNATURE, TTY_DV);
	write(fd, signature, sizeof(signature));
	write(fd, buffer, len);
	close(fd);
	signal(SIGIO, dumpModem);
}

void
readModem(void)
{
	int len;
	int fd;
	char buffer[BUFSZ];
	char signature[SIGLEN];

	sprintf(signature, SIGNATURE, TTY_DV);
	fd = open(modemsettings, O_RDONLY);
	if (fd < 0)
		return;
	len = read(fd, buffer, sizeof(signature));
	if (len < 0) {
		perror(modemsettings);
		exit(-1);
	}
    if (len == 0) {     /* empty file, ignore it */
        close(fd);
        return;
    }
	if (strcmp(buffer, signature)) {
		fprintf(stderr, "Version of iprofd (%d) does NOT match\n", TTY_DV);
		fprintf(stderr, "signature of saved data!\n");
		fprintf(stderr, "Profiles NOT restored, use AT&W0 to update data.\n");
		close(fd);
		return;
	}
	len = read(fd, buffer, BUFSZ);
	if (len < 0) {
		perror(modemsettings);
		exit(-1);
	}
	close(fd);
	if (ioctl(isdnctrl_fd, IIOCSETPRF, &buffer) < 0) {
		perror("ioctl IIOCSETPRF");
		exit(-1);
	}
}

void
usage(void)
{
	fprintf(stderr, "usage: iprofd <IsdnModemProfile>\n");
	exit(-1);
}

int
main(int argc, char **argv)
{

	int data_version;

	if (argc != 2)
		usage();
	modemsettings = argv[1];
	isdnctrl_fd = open("/dev/isdninfo", O_RDWR);
	if (isdnctrl_fd < 0) {
		perror("/dev/isdninfo");
		exit(-1);
	}
	data_version = ioctl(isdnctrl_fd, IIOCGETDVR, 0);
	if (data_version < 0) {
		fprintf(stderr, "Could not get version of kernel modem-profile!\n");
		fprintf(stderr, "Make sure, you are using the correct version.\n");
		fprintf(stderr, "(Try recompiling iprofd).\n");
		exit(-1);
	}
	close(isdnctrl_fd);
	data_version &= 0xff;
	if (data_version != TTY_DV) {
		fprintf(stderr, "Version of kernel modem-profile (%d) does NOT match\n",
			data_version);
		fprintf(stderr, "version of iprofd (%d)!\n", TTY_DV);
		fprintf(stderr, "Make sure, you are using the correct version.\n");
		fprintf(stderr, "(Try recompiling iprofd).\n");
		exit(-1);
	}
	isdnctrl_fd = open("/dev/isdnctrl", O_RDONLY);
	if (isdnctrl_fd < 0) {
		perror("/dev/isdninfo");
		exit(-1);
	}
	readModem();
	switch (fork()) {
		case -1:
			perror("fork");
			exit(-1);
			break;
		case 0:
			dumpModem(0);
			if (ioctl(isdnctrl_fd, IIOCSIGPRF, 0)) {
				perror("ioctl IIOCSIGPRF");
				exit(-1);
			}
			while (1)
				sleep(1000);
			break;
		default:
			break;
	}
	return 0;
}