dahdi-tools/dahdi_cfg.c

/*
 * Configuration program for DAHDI Telephony Interface
 *
 * Written by Mark Spencer <markster@digium.com>
 * Based on previous works, designs, and architectures conceived and
 * written by Jim Dixon <jim@lambdatel.com>.
 *
 * Copyright (C) 2001 Jim Dixon / Zapata Telephony.
 * Copyright (C) 2001-2008 Digium, Inc.
 *
 * All rights reserved.
 *
 * Primary Author: Mark Spencer <markster@digium.com>
 * Radio Support by Jim Dixon <jim@lambdatel.com>
 */

/*
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2 as published by the
 * Free Software Foundation. See the LICENSE file included with
 * this program for more details.
 */

#include <stdio.h> 
#include <getopt.h>
#include <signal.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <semaphore.h>
#include <errno.h>
#include <dirent.h>
#include <stdbool.h>

#include <dahdi/user.h>
#include "tonezone.h"
#include "dahdi_tools_version.h"

#define CONFIG_FILENAME "/etc/dahdi/system.conf"
#define MASTER_DEVICE   "/dev/dahdi/ctl"

#define NUM_SPANS DAHDI_MAX_SPANS

#define NUM_TONES 15

/*! A sanity check for the timing parameter of the span. 
 *
 * Note that each driver using it is still responsible for validating
 * that value.
 */
#define MAX_TIMING 255 

/* Assume no more than 1024 dynamics */
#define NUM_DYNAMIC	1024

static int lineno=0;

static FILE *cf;

static char *filename=CONFIG_FILENAME;

int rxtones[NUM_TONES + 1],rxtags[NUM_TONES + 1],txtones[NUM_TONES + 1];
int bursttime = 0, debouncetime = 0, invertcor = 0, exttone = 0, corthresh = 0;
int txgain = 0, rxgain = 0, deemp = 0, preemp = 0;

int corthreshes[] = {3125,6250,9375,12500,15625,18750,21875,25000,0} ;

static int toneindex = 1;

#define DEBUG_READER (1 << 0)
#define DEBUG_PARSER (1 << 1)
#define DEBUG_APPLY  (1 << 2)
static int debug = 0;

static int errcnt = 0;

static int deftonezone = -1;

static struct dahdi_lineconfig lc[DAHDI_MAX_SPANS];

static struct dahdi_chanconfig cc[DAHDI_MAX_CHANNELS];

static int only_span = 0;
static int restrict_channels = 0;
static int selected_channels[DAHDI_MAX_CHANNELS];
static int declared_spans[DAHDI_MAX_SPANS];

static struct dahdi_attach_echocan ae[DAHDI_MAX_CHANNELS];

static struct dahdi_dynamic_span zds[NUM_DYNAMIC];

static const char *sig[DAHDI_MAX_CHANNELS];		/* Signalling */

static int slineno[DAHDI_MAX_CHANNELS];	/* Line number where signalling specified */

static int fiftysixkhdlc[DAHDI_MAX_CHANNELS];

static int spans=0;

static int dry_run = 0;

static int verbose = 0;

static int force = 0;

static int stopmode = 0;

static int numdynamic = 0;

static char zonestoload[DAHDI_TONE_ZONE_MAX][10];

static int numzones = 0;

static int fd = -1;

static const char *lbostr[] = {
"0 db (CSU)/0-133 feet (DSX-1)",
"133-266 feet (DSX-1)",
"266-399 feet (DSX-1)",
"399-533 feet (DSX-1)",
"533-655 feet (DSX-1)",
"-7.5db (CSU)",
"-15db (CSU)",
"-22.5db (CSU)"
};

static const char *laws[] = {
	"Default",
	"Mu-law",
	"A-law"
};

static bool _are_all_spans_assigned(const char *device_path)
{
	char attribute[1024];
	int res;
	FILE *fp;
	int span_count;
	DIR *dirp;
	struct dirent *dirent;

	snprintf(attribute, sizeof(attribute) - 1,
		 "%s/span_count", device_path);
	fp = fopen(attribute, "r");
	if (NULL == fp) {
		fprintf(stderr, "Failed to open '%s'.\n", attribute);
		return false;
	}
	res = fscanf(fp, "%d", &span_count);
	fclose(fp);

	if (EOF == res) {
		fprintf(stderr, "Failed to read '%s'.\n", attribute);
		return false;
	}

	dirp = opendir(device_path);
	while (span_count) {
		dirent = readdir(dirp);
		if (NULL == dirent)
			break;
		if (!strncmp("span-", dirent->d_name, 5)) {
			--span_count;
		}
	}
	closedir(dirp);
	return (span_count > 0) ? false : true;
}

/**
 * are_all_spans_assigned - Look in sysfs to see if all spans for a device are assigned.
 *
 * Returns true if there are $span_count child spans of all devices, or false
 *  otherwise.
 */
static bool are_all_spans_assigned(void)
{
	DIR *dirp;
	struct dirent *dirent;
	bool res = true;
	char device_path[1024];

	dirp = opendir("/sys/bus/dahdi_devices/devices");
	if (!dirp) {
		/* If we cannot open dahdi_devices, either dahdi isn't loaded,
		 * or we're using an older version of DAHDI that doesn't use
		 * sysfs. */
		return true;
	}

	while (true && res) {

		dirent = readdir(dirp);
		if (NULL == dirent)
			break;

		if (!strcmp(dirent->d_name, ".") ||
		    !strcmp(dirent->d_name, ".."))
			continue;

		snprintf(device_path, sizeof(device_path)-1,
			 "/sys/bus/dahdi_devices/devices/%s", dirent->d_name);
		res = _are_all_spans_assigned(device_path);
	}

	closedir(dirp);
	errno = 0;
	return res;
}

static bool wait_for_all_spans_assigned(unsigned long timeout_sec)
{
	bool all_assigned = are_all_spans_assigned();
	unsigned int timeout = 10*timeout_sec;

	while (!all_assigned && --timeout) {
		usleep(100000);
		all_assigned = are_all_spans_assigned();
	}

	return all_assigned;
}

static const char *sigtype_to_str(const int sig)
{
	switch (sig) {
	case 0:
		return "Unused";
	case DAHDI_SIG_EM:
		return "E & M";
	case DAHDI_SIG_EM_E1:
		return "E & M E1";
	case DAHDI_SIG_FXSLS:
		return "FXS Loopstart";
	case DAHDI_SIG_FXSGS:
		return "FXS Groundstart";
	case DAHDI_SIG_FXSKS:
		return "FXS Kewlstart";
	case DAHDI_SIG_FXOLS:
		return "FXO Loopstart";
	case DAHDI_SIG_FXOGS:
		return "FXO Groundstart";
	case DAHDI_SIG_FXOKS:
		return "FXO Kewlstart";
	case DAHDI_SIG_CAS:
		return "CAS / User";
	case DAHDI_SIG_DACS:
		return "DACS";
	case DAHDI_SIG_DACS_RBS:
		return "DACS w/RBS";
	case DAHDI_SIG_CLEAR:
		return "Clear channel";
	case DAHDI_SIG_SLAVE:
		return "Slave channel";
	case DAHDI_SIG_HDLCRAW:
		return "Raw HDLC";
	case DAHDI_SIG_HDLCNET:
		return "Network HDLC";
	case DAHDI_SIG_HDLCFCS:
		return "HDLC with FCS check";
	case DAHDI_SIG_HARDHDLC:
		return "Hardware assisted D-channel";
	case DAHDI_SIG_MTP2:
		return "MTP2";
	default:
		return "Unknown";
	}
}

static void clear_fields()
{

	memset(rxtones,0,sizeof(rxtones));
	memset(rxtags,0,sizeof(rxtags));
	memset(txtones,0,sizeof(txtones));
	bursttime = 0;
	debouncetime = 0;
	invertcor = 0;
	exttone = 0;
	txgain = 0;
	rxgain = 0;
	deemp = 0;
	preemp = 0;
}

static int error(char *fmt, ...) __attribute__ ((format(printf, 1, 2)));

static int error(char *fmt, ...)
{
	int res;
	static int shown=0;
	va_list ap;
	if (!shown) {
		fprintf(stderr, "Notice: Configuration file is %s\n", filename);
		shown++;
	}
	res = fprintf(stderr, "line %d: ", lineno);
	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	errcnt++;
	return res;
}

static char *trim(char *buf)
{
	size_t len;

	while (*buf && (*buf < 33)) {
		buf++;
	}

	len = strlen(buf);

	while (len && buf[len-1] < 33) {
		buf[--len] = '\0';
	}

	return buf;
}

static int skip_channel(int x)
{
	if (restrict_channels) {
		if (!selected_channels[x])
			return 1;
	} else {
		if (only_span && !declared_spans[only_span]) {
			fprintf(stderr,
				"Error: analog span %d given to '-S', without '-C' restriction.\n",
				only_span);
			exit(1);
		}
	}
	return 0;
}

static int parseargs(char *input, char *output[], int maxargs, char sep)
{
	char *c;
	int pos=0;
	c = input;
	output[pos++] = c;
	while(*c) {
		while(*c && (*c != sep)) c++;
		if (*c) {
			*c = '\0';
			c++;
			while(*c && (*c < 33)) c++;
			if (*c)  {
				if (pos >= maxargs)
					return -1;
				output[pos] = c;
				trim(output[pos]);
				pos++;
				output[pos] = NULL;
				/* Return error if we have too many */
			} else
				return pos;
		}
	}
	return pos;
}

int dspanconfig(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int chans;
	int timing;
	res = parseargs(args, realargs, 4, ',');
	if (res != 4) {
		error("Incorrect number of arguments to 'dynamic' (should be <driver>,<address>,<num channels>, <timing>)\n");
		return -1;
	}
	res = sscanf(realargs[2], "%d", &chans);
	if ((res == 1) && (chans < 1))
		res = -1;
	if (res != 1) {
		error("Invalid number of channels '%s', should be a number > 0.\n", realargs[2]);
		return -1;
	}

	res = sscanf(realargs[3], "%d", &timing);
	if ((res == 1) && (timing < 0))
		res = -1;
	if (res != 1) {
		error("Invalid timing '%s', should be a number > 0.\n", realargs[3]);
		return -1;
	}


	dahdi_copy_string(zds[numdynamic].driver, realargs[0], sizeof(zds[numdynamic].driver));
	dahdi_copy_string(zds[numdynamic].addr, realargs[1], sizeof(zds[numdynamic].addr));
	zds[numdynamic].numchans = chans;
	zds[numdynamic].timing = timing;
	
	numdynamic++;
	return 0;
}

int spanconfig(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int argc;
	int span;
	int timing;
	int i;
	argc = res = parseargs(args, realargs, 9, ',');
	if ((res < 5) || (res > 9)) {
		error("Incorrect number of arguments to 'span' (should be <spanno>,<timing>,<lbo>,<framing>,<coding>[, crc4 | yellow [, yellow]])\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &span);
	if (res != 1) {
		error("Span number should be a valid span number, not '%s'\n", realargs[0]);
		return -1;
	}
	declared_spans[span] = 1;
	res = sscanf(realargs[1], "%d", &timing);
	if ((res != 1) || (timing < 0) || (timing > MAX_TIMING)) {
		error("Timing should be a number from 0 to %d, not '%s'\n", 
				MAX_TIMING,  realargs[1]);
		return -1;
	}
	res = sscanf(realargs[2], "%d", &lc[spans].lbo);
	if (res != 1) {
		error("Line build-out (LBO) should be a number from 0 to 7 (usually 0) not '%s'\n", realargs[2]);
		return -1;
	}
	if ((lc[spans].lbo < 0) || (lc[spans].lbo > 7)) {
		error("Line build-out should be in the range 0 to 7, not %d\n", lc[spans].lbo);
		return -1;
	}
	if (!strcasecmp(realargs[3], "d4")) {
		lc[spans].lineconfig |= DAHDI_CONFIG_D4;
		lc[spans].lineconfig &= ~DAHDI_CONFIG_ESF;
		lc[spans].lineconfig &= ~DAHDI_CONFIG_CCS;
	} else if (!strcasecmp(realargs[3], "esf")) {
		lc[spans].lineconfig |= DAHDI_CONFIG_ESF;
		lc[spans].lineconfig &= ~DAHDI_CONFIG_D4;
		lc[spans].lineconfig &= ~DAHDI_CONFIG_CCS;
	} else if (!strcasecmp(realargs[3], "ccs")) {
		lc[spans].lineconfig |= DAHDI_CONFIG_CCS;
		lc[spans].lineconfig &= ~(DAHDI_CONFIG_ESF | DAHDI_CONFIG_D4);
	} else if (!strcasecmp(realargs[3], "cas")) {
		lc[spans].lineconfig &= ~DAHDI_CONFIG_CCS;
		lc[spans].lineconfig &= ~(DAHDI_CONFIG_ESF | DAHDI_CONFIG_D4);
	} else {
		error("Framing(T1)/Signalling(E1) must be one of 'd4', 'esf', 'cas' or 'ccs', not '%s'\n", realargs[3]);
		return -1;
	}
	if (!strcasecmp(realargs[4], "ami")) {
		lc[spans].lineconfig &= ~(DAHDI_CONFIG_B8ZS | DAHDI_CONFIG_HDB3);
		lc[spans].lineconfig |= DAHDI_CONFIG_AMI;
	} else if (!strcasecmp(realargs[4], "b8zs")) {
		lc[spans].lineconfig |= DAHDI_CONFIG_B8ZS;
		lc[spans].lineconfig &= ~(DAHDI_CONFIG_AMI | DAHDI_CONFIG_HDB3);
	} else if (!strcasecmp(realargs[4], "hdb3")) {
		lc[spans].lineconfig |= DAHDI_CONFIG_HDB3;
		lc[spans].lineconfig &= ~(DAHDI_CONFIG_AMI | DAHDI_CONFIG_B8ZS);
	} else {
		error("Coding must be one of 'ami', 'b8zs' or 'hdb3', not '%s'\n", realargs[4]);
		return -1;
	}
	for (i = 5; i < argc; i++) {
		if (!strcasecmp(realargs[i], "yellow"))
			lc[spans].lineconfig |= DAHDI_CONFIG_NOTOPEN;
		else if (!strcasecmp(realargs[i], "crc4"))
			lc[spans].lineconfig |= DAHDI_CONFIG_CRC4;
		else if (!strcasecmp(realargs[i], "nt"))
			lc[spans].lineconfig |= DAHDI_CONFIG_NTTE;
		else if (!strcasecmp(realargs[i], "te"))
			lc[spans].lineconfig &= ~DAHDI_CONFIG_NTTE;
		else if (!strcasecmp(realargs[i], "term"))
			lc[spans].lineconfig |= DAHDI_CONFIG_TERM;
		else {
			error("Remaining arguments may be any of: 'yellow', 'crc4', 'nt', 'te', 'term', not '%s'\n", realargs[i]);
			return -1;
		}

	}
	lc[spans].span = span;
	lc[spans].sync = timing;
	/* Valid span */
	spans++;
	return 0;
}

int apply_channels(int chans[], char *argstr)
{
	char *args[DAHDI_MAX_CHANNELS+1];
	char *range[3];
	int res,x, res2,y;
	int chan;
	int start, finish;
	char argcopy[256];
	res = parseargs(argstr, args, DAHDI_MAX_CHANNELS, ',');
	if (res < 0) {
		error("Too many arguments...  Max is %d\n", DAHDI_MAX_CHANNELS);
		return -1;
	}
	for (x=0;x<res;x++) {
		if (strchr(args[x], '-')) {
			/* It's a range */
			dahdi_copy_string(argcopy, args[x], sizeof(argcopy));
			res2 = parseargs(argcopy, range, 2, '-');
			if (res2 != 2) {
				error("Syntax error in range '%s'.  Should be <val1>-<val2>.\n", args[x]);
				return -1;
			}
			res2 =sscanf(range[0], "%d", &start);
			if (res2 != 1) {
				error("Syntax error.  Start of range '%s' should be a number from 1 to %d\n", args[x], DAHDI_MAX_CHANNELS - 1);
				return -1;
			} else if ((start < 1) || (start >= DAHDI_MAX_CHANNELS)) {
				error("Start of range '%s' must be between 1 and %d (not '%d')\n", args[x], DAHDI_MAX_CHANNELS - 1, start);
				return -1;
			}
			res2 =sscanf(range[1], "%d", &finish);
			if (res2 != 1) {
				error("Syntax error.  End of range '%s' should be a number from 1 to %d\n", args[x], DAHDI_MAX_CHANNELS - 1);
				return -1;
			} else if ((finish < 1) || (finish >= DAHDI_MAX_CHANNELS)) {
				error("end of range '%s' must be between 1 and %d (not '%d')\n", args[x], DAHDI_MAX_CHANNELS - 1, finish);
				return -1;
			}
			if (start > finish) {
				error("Range '%s' should start before it ends\n", args[x]);
				return -1;
			}
			for (y=start;y<=finish;y++)
				chans[y]=1;
		} else {
			/* It's a single channel */
			res2 =sscanf(args[x], "%d", &chan);
			if (res2 != 1) {
				error("Syntax error.  Channel should be a number from 1 to %d, not '%s'\n", DAHDI_MAX_CHANNELS - 1, args[x]);
				return -1;
			} else if ((chan < 1) || (chan >= DAHDI_MAX_CHANNELS)) {
				error("Channel must be between 1 and %d (not '%d')\n", DAHDI_MAX_CHANNELS - 1, chan);
				return -1;
			}
			chans[chan]=1;
		}		
	}
	return res;
}

int parse_idle(int *i, char *s)
{
	char a,b,c,d;
	if (s) {
		if (sscanf(s, "%c%c%c%c", &a,&b,&c,&d) == 4) {
			if (((a == '0') || (a == '1')) && ((b == '0') || (b == '1')) && ((c == '0') || (c == '1')) && ((d == '0') || (d == '1'))) {
				*i = 0;
				if (a == '1') 
					*i |= DAHDI_ABIT;
				if (b == '1')
					*i |= DAHDI_BBIT;
				if (c == '1')
					*i |= DAHDI_CBIT;
				if (d == '1')
					*i |= DAHDI_DBIT;
				return 0;
			}
		}
	}
	error("CAS Signalling requires idle definition in the form ':xxxx' at the end of the channel definition, where xxxx represent the a, b, c, and d bits\n");
	return -1;
}

static int parse_channel(char *channel, int *startchan)
{
	if (!channel || (sscanf(channel, "%d", startchan) != 1) || 
		(*startchan < 1)) {
		error("DACS requires a starting channel in the form ':x' where x is the channel\n");
		return -1;
	}
	return 0;
}

static int chanconfig(char *keyword, char *args)
{
	int chans[DAHDI_MAX_CHANNELS];
	int res = 0;
	int x;
	int master=0;
	int dacschan = 0;
	char *idle;
	bzero(chans, sizeof(chans));
	strtok(args, ":");
	idle = strtok(NULL, ":");
	if (!strcasecmp(keyword, "dacs") || !strcasecmp(keyword, "dacsrbs")) {
		res = parse_channel(idle, &dacschan);
	}
	if (!res)
		res = apply_channels(chans, args);
	if (res <= 0)
		return -1;
	for (x=1;x<DAHDI_MAX_CHANNELS;x++) {
		if (chans[x]) {
			if (slineno[x]) {
				error("Channel %d already configured as '%s' at line %d\n", x, sig[x], slineno[x]);
				continue;
			}
			if ((!strcasecmp(keyword, "dacs") || !strcasecmp(keyword, "dacsrbs")) && slineno[dacschan]) {
				error("DACS Destination channel %d already configured as '%s' at line %d\n", dacschan, sig[dacschan], slineno[dacschan]);
				continue;
			} else {
				cc[dacschan].chan = dacschan;
				cc[dacschan].master = dacschan;
				slineno[dacschan] = lineno;
			}
			cc[x].chan = x;
			cc[x].master = x;
			slineno[x] = lineno;
			if (!strcasecmp(keyword, "e&m")) {
				cc[x].sigtype = DAHDI_SIG_EM;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "e&me1")) {
				cc[x].sigtype = DAHDI_SIG_EM_E1;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "fxsls")) {
				cc[x].sigtype = DAHDI_SIG_FXSLS;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "fxsgs")) {
				cc[x].sigtype = DAHDI_SIG_FXSGS;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "fxsks")) {
				cc[x].sigtype = DAHDI_SIG_FXSKS;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "fxols")) {
				cc[x].sigtype = DAHDI_SIG_FXOLS;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "fxogs")) {
				cc[x].sigtype = DAHDI_SIG_FXOGS;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "fxoks")) {
				cc[x].sigtype = DAHDI_SIG_FXOKS;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "cas") || !strcasecmp(keyword, "user")) {
				if (parse_idle(&cc[x].idlebits, idle))
					return -1;
				cc[x].sigtype = DAHDI_SIG_CAS;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "dacs")) {
				/* Setup channel for monitor */
				cc[x].idlebits = dacschan;
				cc[x].sigtype = DAHDI_SIG_DACS;
				sig[x] = sigtype_to_str(cc[x].sigtype);
				/* Setup inverse */
				cc[dacschan].idlebits = x;
				cc[dacschan].sigtype = DAHDI_SIG_DACS;
				sig[x] = sigtype_to_str(cc[dacschan].sigtype);
				dacschan++;
			} else if (!strcasecmp(keyword, "dacsrbs")) {
				/* Setup channel for monitor */
				cc[x].idlebits = dacschan;
				cc[x].sigtype = DAHDI_SIG_DACS_RBS;
				sig[x] = sigtype_to_str(cc[x].sigtype);
				/* Setup inverse */
				cc[dacschan].idlebits = x;
				cc[dacschan].sigtype = DAHDI_SIG_DACS_RBS;
				sig[x] = sigtype_to_str(cc[dacschan].sigtype);
				dacschan++;
			} else if (!strcasecmp(keyword, "unused")) {
				cc[x].sigtype = 0;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "indclear") || !strcasecmp(keyword, "bchan")) {
				cc[x].sigtype = DAHDI_SIG_CLEAR;
				sig[x] = sigtype_to_str(cc[x].sigtype);
			} else if (!strcasecmp(keyword, "clear")) {
				sig[x] = sigtype_to_str(DAHDI_SIG_CLEAR);
				if (master) {
					cc[x].sigtype = DAHDI_SIG_SLAVE;
					cc[x].master = master;
				} else {
					cc[x].sigtype = DAHDI_SIG_CLEAR;
					master = x;
				}
			} else if (!strcasecmp(keyword, "rawhdlc")) {
				sig[x] = sigtype_to_str(DAHDI_SIG_HDLCRAW);
				if (master) {
					cc[x].sigtype = DAHDI_SIG_SLAVE;
					cc[x].master = master;
				} else {
					cc[x].sigtype = DAHDI_SIG_HDLCRAW;
					master = x;
				}
			} else if (!strcasecmp(keyword, "nethdlc")) {
				sig[x] = sigtype_to_str(DAHDI_SIG_HDLCNET);
				memset(cc[x].netdev_name, 0, sizeof(cc[x].netdev_name));
				if (master) {
					cc[x].sigtype = DAHDI_SIG_SLAVE;
					cc[x].master = master;
				} else {
					cc[x].sigtype = DAHDI_SIG_HDLCNET;
					if (idle) {
					    dahdi_copy_string(cc[x].netdev_name, idle, sizeof(cc[x].netdev_name));
					}
					master = x;
				}
			} else if (!strcasecmp(keyword, "fcshdlc")) {
				sig[x] = sigtype_to_str(DAHDI_SIG_HDLCFCS);
				if (master) {
					cc[x].sigtype = DAHDI_SIG_SLAVE;
					cc[x].master = master;
				} else {
					cc[x].sigtype = DAHDI_SIG_HDLCFCS;
					master = x;
				}
			} else if (!strcasecmp(keyword, "dchan")) {
				sig[x] = "D-channel";
				cc[x].sigtype = DAHDI_SIG_HDLCFCS;
			} else if (!strcasecmp(keyword, "hardhdlc")) {
				sig[x] = "Hardware assisted D-channel";
				cc[x].sigtype = DAHDI_SIG_HARDHDLC;
			} else if (!strcasecmp(keyword, "mtp2")) {
				sig[x] = "MTP2";
				cc[x].sigtype = DAHDI_SIG_MTP2;
			} else {
				fprintf(stderr, "Huh? (%s)\n", keyword);
			}

			if (cc[x].sigtype != DAHDI_SIG_CAS &&
			    cc[x].sigtype != DAHDI_SIG_DACS &&
			    cc[x].sigtype != DAHDI_SIG_DACS_RBS) {
				if (NULL != idle) {
					fprintf(stderr, "WARNING: idlebits are not valid on %s channels.\n", sig[x]);
				}
			}
		}
	}
	return 0;
}

static int setlaw(char *keyword, char *args)
{
	int res;
	int law;
	int x;
	int chans[DAHDI_MAX_CHANNELS];

	bzero(chans, sizeof(chans));
	res = apply_channels(chans, args);
	if (res <= 0)
		return -1;
	if (!strcasecmp(keyword, "alaw")) {
		law = DAHDI_LAW_ALAW;
	} else if (!strcasecmp(keyword, "mulaw")) {
		law = DAHDI_LAW_MULAW;
	} else if (!strcasecmp(keyword, "deflaw")) {
		law = DAHDI_LAW_DEFAULT;
	} else {
		fprintf(stderr, "Huh??? Don't know about '%s' law\n", keyword);
		return -1;
	}
	for (x=0;x<DAHDI_MAX_CHANNELS;x++) {
		if (chans[x])
			cc[x].deflaw = law;
	}
	return 0;
}

static int setfiftysixkhdlc(char *keyword, char *args)
{
	int res;

	res = apply_channels(fiftysixkhdlc, args);
	if (res <= 0)
		return -1;

	return 0;
}

static int apply_fiftysix(void)
{
	int x;
	int rate;
	int chanfd;

	for (x = 1; x < DAHDI_MAX_CHANNELS; x++) {
		if (skip_channel(x) || !cc[x].sigtype)
			continue;

		chanfd = open("/dev/dahdi/channel", O_RDWR);
		if (chanfd == -1) {
			fprintf(stderr, 
			    "Couldn't open /dev/dahdi/channel: %s\n", 
			    strerror(errno));
			return -1;	
		}

		if (ioctl(chanfd, DAHDI_SPECIFY, &x)) {
			close(chanfd);
			continue;
		}

		if (fiftysixkhdlc[x]) {
			printf("Setting channel %d to 56K mode (only valid on HDLC channels)\n", x);
			rate = 56;
		} else {
			rate = 64;
		}

		if (ioctl(chanfd, DAHDI_HDLC_RATE, &rate)) {
			fprintf(stderr, "Error setting HDLC rate\n");
			exit(-1);
		}
		close(chanfd);
	}
	return 0;
}

static int setechocan(char *keyword, char *args)
{
	int res;
	int chans[DAHDI_MAX_CHANNELS] = { 0, };
	char *echocan, *chanlist;
	unsigned int x;

	echocan = strtok(args, ",");

	while ((chanlist = strtok(NULL, ","))) {
		res = apply_channels(chans, chanlist);
		if (res <= 0) {
			return -1;
		}
	}

	for (x = 0; x < DAHDI_MAX_CHANNELS; x++) {
		if (chans[x]) {
			dahdi_copy_string(ae[x].echocan, echocan, sizeof(ae[x].echocan));
		}
	}

	return 0;
}

static int registerzone(char *keyword, char *args)
{
	if (numzones >= DAHDI_TONE_ZONE_MAX) {
		error("Too many tone zones specified\n");
		return 0;
	}
	dahdi_copy_string(zonestoload[numzones++], args, sizeof(zonestoload[0]));
	return 0;
}

static int defaultzone(char *keyword, char *args)
{
	struct tone_zone *z;
	if (!(z = tone_zone_find(args))) {
		error("No such tone zone known: %s\n", args);
		return 0;
	}
	deftonezone = z->zone;
	return 0;
}

#if 0
static int unimplemented(char *keyword, char *args)
{
	fprintf(stderr, "Warning: '%s' is not yet implemented\n", keyword);
	return 0;
}
#endif


/* Radio functions */

int ctcss(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int rxtone;
	int rxtag;
	int txtone;
	int isdcs = 0;
	res = parseargs(args, realargs, 3, ',');
	if (res != 3) {
		error("Incorrect number of arguments to 'ctcss' (should be <rxtone>,<rxtag>,<txtone>)\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &rxtone);
	if ((res == 1) && (rxtone < 1))
		res = -1;
	if (res != 1) {
		error("Invalid rxtone '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}
	res = sscanf(realargs[1], "%d", &rxtag);
	if ((res == 1) && (rxtag < 0))
		res = -1;
	if (res != 1) {
		error("Invalid rxtag '%s', should be a number > 0.\n", realargs[1]);
		return -1;
	}
	if ((*realargs[2] == 'D') || (*realargs[2] == 'd'))
	{
		realargs[2]++;
		isdcs = 0x8000;
	}
	res = sscanf(realargs[2], "%d", &txtone);
	if ((res == 1) && (rxtag < 0))
		res = -1;
	if (res != 1) {
		error("Invalid txtone '%s', should be a number > 0.\n", realargs[2]);
		return -1;
	}

	if (toneindex >= NUM_TONES)
	{
		error("Cannot specify more then %d CTCSS tones\n",NUM_TONES);
		return -1;
	}
	rxtones[toneindex] = rxtone;
	rxtags[toneindex] = rxtag;
	txtones[toneindex] = txtone | isdcs;
	toneindex++;
	return 0;
}

int dcsrx(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int rxtone;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'dcsrx' (should be <rxtone>)\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &rxtone);
	if ((res == 1) && (rxtone < 1))
		res = -1;
	if (res != 1) {
		error("Invalid rxtone '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}

	rxtones[0] = rxtone;
	return 0;
}

int tx(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int txtone;
	int isdcs = 0;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'tx' (should be <txtone>)\n");
		return -1;
	}
	if ((*realargs[0] == 'D') || (*realargs[0] == 'd'))
	{
		realargs[0]++;
		isdcs = 0x8000;
	}
	res = sscanf(realargs[0], "%d", &txtone);
	if ((res == 1) && (txtone < 1))
		res = -1;
	if (res != 1) {
		error("Invalid tx (tone) '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}

	txtones[0] = txtone | isdcs;
	return 0;
}

int debounce_time(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int val;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'debouncetime' (should be <value>)\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &val);
	if ((res == 1) && (val < 1))
		res = -1;
	if (res != 1) {
		error("Invalid value '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}

	debouncetime = val;
	return 0;
}

int burst_time(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int val;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'bursttime' (should be <value>)\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &val);
	if ((res == 1) && (val < 1))
		res = -1;
	if (res != 1) {
		error("Invalid value '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}

	bursttime = val;
	return 0;
}

int tx_gain(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int val;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'txgain' (should be <value>)\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &val);
	if (res != 1) {
		error("Invalid value '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}

	txgain = val;
	return 0;
}

int rx_gain(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int val;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'rxgain' (should be <value>)\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &val);
	if (res != 1) {
		error("Invalid value '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}

	rxgain = val;
	return 0;
}

int de_emp(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int val;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'de-emp' (should be <value>)\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &val);
	if ((res == 1) && (val < 1))
		res = -1;
	if (res != 1) {
		error("Invalid value '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}

	deemp = val;
	return 0;
}

int pre_emp(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int val;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'pre_emp' (should be <value>)\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &val);
	if ((res == 1) && (val < 1))
		res = -1;
	if (res != 1) {
		error("Invalid value '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}

	preemp = val;
	return 0;
}

int invert_cor(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int val;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'invertcor' (should be <value>)\n");
		return -1;
	}
	if ((*realargs[0] == 'y') || (*realargs[0] == 'Y')) val = 1;
	else if ((*realargs[0] == 'n') || (*realargs[0] == 'N')) val = 0;
	else
	{
		res = sscanf(realargs[0], "%d", &val);
		if ((res == 1) && (val < 0))
			res = -1;
		if (res != 1) {
			error("Invalid value '%s', should be a number > 0.\n", realargs[0]);
			return -1;
		}
	}
	invertcor = (val > 0);
	return 0;
}

int ext_tone(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int val;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'exttone' (should be <value>)\n");
		return -1;
	}
	if ((*realargs[0] == 'y') || (*realargs[0] == 'Y')) val = 1;
	else if ((*realargs[0] == 'n') || (*realargs[0] == 'N')) val = 0;
	else if ((*realargs[0] == 'i') || (*realargs[0] == 'I')) val = 2;
	else
	{
		res = sscanf(realargs[0], "%d", &val);
		if ((res == 1) && (val < 0))
			res = -1;
		if (val > 2) res = -1;
		if (res != 1) {
			error("Invalid value '%s', should be a number > 0.\n", realargs[0]);
			return -1;
		}
	}
	exttone = val;
	return 0;
}

int cor_thresh(char *keyword, char *args)
{
	static char *realargs[10];
	int res;
	int val;
	int x = 0;
	res = parseargs(args, realargs, 1, ',');
	if (res != 1) {
		error("Incorrect number of arguments to 'corthresh' (should be <value>)\n");
		return -1;
	}
	res = sscanf(realargs[0], "%d", &val);
	if ((res == 1) && (val < 1))
		res = -1;
	for(x = 0; corthreshes[x]; x++)
	{
		if (corthreshes[x] == val) break;
	}
	if (!corthreshes[x]) res = -1;
	if (res != 1) {
		error("Invalid value '%s', should be a number > 0.\n", realargs[0]);
		return -1;
	}
	corthresh = x + 1;
	return 0;
}

static int rad_chanconfig(char *keyword, char *args)
{
	int chans[DAHDI_MAX_CHANNELS];
	int res = 0;
	int x,i,n;
	struct dahdi_radio_param p;
	int chanfd;

	toneindex = 1;
	bzero(chans, sizeof(chans));
	res = apply_channels(chans, args);
	if (res <= 0)
		return -1;
	for (x=1;x<DAHDI_MAX_CHANNELS;x++) {
		if (chans[x]) {
			const char *CHANNEL_FILENAME = "/dev/dahdi/channel";
			chanfd = open(CHANNEL_FILENAME, O_RDWR);
			if (-1 == chanfd) {
				error("Failed to open '%s'.\n", CHANNEL_FILENAME);
				exit(-1);
			}

			res = ioctl(chanfd, DAHDI_SPECIFY, &x);
			if (res) {
				error("Failed to open channel %d.\n", x);
				close(chanfd);
				continue;
			}
			p.radpar = DAHDI_RADPAR_NUMTONES;
			if (ioctl(chanfd,DAHDI_RADIO_GETPARAM,&p) == -1)
				n = 0;
			else
				n = p.data;

			if (n)
			{
				p.radpar = DAHDI_RADPAR_INITTONE;
				if (ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p) == -1) {
					error("Cannot init tones for channel %d\n",x);
				}
				if (!rxtones[0]) for(i = 1; i <= n; i++)
				{
					if (rxtones[i])
					{
						p.radpar = DAHDI_RADPAR_RXTONE;
						p.index = i;
						p.data = rxtones[i];
						if (ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p) == -1)
							error("Cannot set rxtone on channel %d\n",x);
					}
					if (rxtags[i])
					{
						p.radpar = DAHDI_RADPAR_RXTONECLASS;
						p.index = i;
						p.data = rxtags[i];
						if (ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p) == -1)
							error("Cannot set rxtag on channel %d\n",x);
					}
					if (txtones[i])
					{
						p.radpar = DAHDI_RADPAR_TXTONE;
						p.index = i;
						p.data = txtones[i];
						if (ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p) == -1)
							error("Cannot set txtone on channel %d\n",x);
					}
				} else { /* if we may have DCS receive */
					if (rxtones[0])
					{
						p.radpar = DAHDI_RADPAR_RXTONE;
						p.index = 0;
						p.data = rxtones[0];
						if (ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p) == -1)
							error("Cannot set DCS rxtone on channel %d\n",x);
					}
				}
				if (txtones[0])
				{
					p.radpar = DAHDI_RADPAR_TXTONE;
					p.index = 0;
					p.data = txtones[0];
					if (ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p) == -1)
						error("Cannot set default txtone on channel %d\n",x);
				}
			}
			if (debouncetime)
			{
				p.radpar = DAHDI_RADPAR_DEBOUNCETIME;
				p.data = debouncetime;
				if (ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p) == -1)
					error("Cannot set debouncetime on channel %d\n",x);
			}
			if (bursttime)
			{
				p.radpar = DAHDI_RADPAR_BURSTTIME;
				p.data = bursttime;
				if (ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p) == -1)
					error("Cannot set bursttime on channel %d\n",x);
			}
			p.radpar = DAHDI_RADPAR_DEEMP;
			p.data = deemp;
			ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p);
			p.radpar = DAHDI_RADPAR_PREEMP;
			p.data = preemp;
			ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p);
			p.radpar = DAHDI_RADPAR_TXGAIN;
			p.data = txgain;
			ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p);
			p.radpar = DAHDI_RADPAR_RXGAIN;
			p.data = rxgain;
			ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p);
			p.radpar = DAHDI_RADPAR_INVERTCOR;
			p.data = invertcor;
			ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p);
			p.radpar = DAHDI_RADPAR_EXTRXTONE;
			p.data = exttone;
			ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p);
			if (corthresh)
			{
				p.radpar = DAHDI_RADPAR_CORTHRESH;
				p.data = corthresh - 1;
				if (ioctl(chanfd,DAHDI_RADIO_SETPARAM,&p) == -1)
					error("Cannot set corthresh on channel %d\n",x);
			}

			close(chanfd);
		}
	}
	clear_fields();
	return 0;
}

/* End Radio functions */

static void printconfig(int fd)
{
	int x,y;
	int ps;
	int configs=0;
	struct dahdi_versioninfo vi;

	strcpy(vi.version, "Unknown");
	strcpy(vi.echo_canceller, "Unknown");

	if (ioctl(fd, DAHDI_GETVERSION, &vi))
		error("Unable to read DAHDI version information.\n");

	printf("\nDAHDI Version: %s\n"
	       "Echo Canceller(s): %s\n"
	       "Configuration\n"
	       "======================\n\n", vi.version, vi.echo_canceller);
	for (x = 0; x < spans; x++) {
		if (only_span && only_span != lc[x].span)
			continue;
		printf("SPAN %d: %3s/%4s Build-out: %s\n",
		       lc[x].span,
		       (lc[x].lineconfig & DAHDI_CONFIG_D4 ? "D4" :
			lc[x].lineconfig & DAHDI_CONFIG_ESF ? "ESF" :
			lc[x].lineconfig & DAHDI_CONFIG_CCS ? "CCS" : "CAS"),
		       (lc[x].lineconfig & DAHDI_CONFIG_AMI ? "AMI" :
			lc[x].lineconfig & DAHDI_CONFIG_B8ZS ? "B8ZS" :
			lc[x].lineconfig & DAHDI_CONFIG_HDB3 ? "HDB3" : "???"),
		       lbostr[lc[x].lbo]);
	}
	for (x=0;x<numdynamic;x++) {
		printf("Dynamic span %d: driver %s, addr %s, channels %d, timing %d\n",
		       x +1, zds[x].driver, zds[x].addr, zds[x].numchans, zds[x].timing);
	}
	if (verbose > 1) {
		printf("\nChannel map:\n\n");
		for (x=1;x<DAHDI_MAX_CHANNELS;x++) {
			if (skip_channel(x))
				continue;
			if ((cc[x].sigtype != DAHDI_SIG_SLAVE) && (cc[x].sigtype)) {
				configs++;
				ps = 0;
				if ((cc[x].sigtype & __DAHDI_SIG_DACS) == __DAHDI_SIG_DACS)
					printf("Channel %02d %s to %02d", x, sig[x], cc[x].idlebits);
				else {
					printf("Channel %02d: %s (%s)", x, sig[x], laws[cc[x].deflaw]);
					printf(" (Echo Canceler: %s)", ae[x].echocan[0] ? ae[x].echocan : "none");
					for (y=1;y<DAHDI_MAX_CHANNELS;y++) {
						if (cc[y].master == x)  {
							printf("%s%02d", ps++ ? " " : " (Slaves: ", y);
						}
					}
				}
				if (ps)
					printf(")\n");
				else
					printf("\n");
			} else
				if (cc[x].sigtype) configs++;
		}
	} else {
		for (x=1;x<DAHDI_MAX_CHANNELS;x++) {
			if (skip_channel(x))
				continue;
			if (cc[x].sigtype)
				configs++;
		}
	}
	printf("\n%d channels to configure.\n\n", configs);
}

static struct handler {
	char *keyword;
	int (*func)(char *keyword, char *args);
} handlers[] = {
	{ "span", spanconfig },
	{ "dynamic", dspanconfig },
	{ "loadzone", registerzone },
	{ "defaultzone", defaultzone },
	{ "e&m", chanconfig },
	{ "e&me1", chanconfig },
	{ "fxsls", chanconfig },
	{ "fxsgs", chanconfig },
	{ "fxsks", chanconfig },
	{ "fxols", chanconfig },
	{ "fxogs", chanconfig },
	{ "fxoks", chanconfig },
	{ "rawhdlc", chanconfig },
	{ "nethdlc", chanconfig },
	{ "fcshdlc", chanconfig },
	{ "hardhdlc", chanconfig },
	{ "mtp2", chanconfig },
	{ "dchan", chanconfig },
	{ "bchan", chanconfig },
	{ "indclear", chanconfig },
	{ "clear", chanconfig },
	{ "unused", chanconfig },
	{ "cas", chanconfig },
	{ "dacs", chanconfig },
	{ "dacsrbs", chanconfig },
	{ "user", chanconfig },
	{ "alaw", setlaw },
	{ "mulaw", setlaw },
	{ "deflaw", setlaw },
	{ "ctcss", ctcss },
	{ "dcsrx", dcsrx },
	{ "rxdcs", dcsrx },
	{ "tx", tx },
	{ "debouncetime", debounce_time },
	{ "bursttime", burst_time },
	{ "exttone", ext_tone },
	{ "invertcor", invert_cor },
	{ "corthresh", cor_thresh },
	{ "rxgain", rx_gain },
	{ "txgain", tx_gain },
	{ "deemp", de_emp },
	{ "preemp", pre_emp },
	{ "channel", rad_chanconfig },
	{ "channels", rad_chanconfig },
	{ "echocanceller", setechocan },
	{ "56k", setfiftysixkhdlc },
};

static char *readline()
{
	static char buf[256];
	char *c;
	do {
		if (!fgets(buf, sizeof(buf), cf)) 
			return NULL;
		/* Strip comments */
		c = strchr(buf, '#');
		if (c)
			*c = '\0';
		trim(buf);
		lineno++;
	} while (!strlen(buf));
	return buf;
}

static void usage(char *argv0, int exitcode)
{
	char *c;
	c = strrchr(argv0, '/');
	if (!c)
		c = argv0;
	else
		c++;
	fprintf(stderr, "%s\n", dahdi_tools_version);
	fprintf(stderr, 
		"Usage: %s [options]\n"
		"    Valid options are:\n"
		"  -c <filename>     -- Use <filename> instead of " CONFIG_FILENAME "\n"
		"  -d [level]        -- Generate debugging output. (Default level is 1.)\n"
		"  -f                -- Always reconfigure every channel\n"
		"  -h                -- Generate this help statement\n"
		"  -s                -- Shutdown spans only\n"
		"  -t                -- Test mode only, do not apply\n"
		"  -C <chan_list>    -- Only configure specified channels\n"
		"  -S <spanno>       -- Only configure specified span\n"
		"  -v                -- Verbose (more -v's means more verbose)\n"
	,c);
	exit(exitcode);
}

static int chan_restrict(char *str)
{
	if (apply_channels(selected_channels, str) < 0)
		return 0;
	restrict_channels = 1;
	return 1;
}

static int span_restrict(char *str)
{
	long	spanno;
	char	*endptr;

	spanno = strtol(str, &endptr, 10);
	if (endptr == str) {
		fprintf(stderr, "Missing valid span number after '-S'\n");
		return 0;
	}
	if (*endptr != '\0') {
		fprintf(stderr, "Extra garbage after span number in '-S'\n");
		return 0;
	}
	only_span = spanno;
	return 1;
}

static const char *SEM_NAME = "dahdi_cfg";
static sem_t *lock = SEM_FAILED;

static void signal_handler(int signal)
{
	if (SEM_FAILED != lock) {
		sem_unlink(SEM_NAME);
	}
	/* The default handler should have been restored before this handler was
	 * called, so we can let the "normal" processing finish the cleanup. */
	raise(signal);
}

int main(int argc, char *argv[])
{
	int c;
	char *buf;
	char *key, *value;
	int x,found;
	int exit_code = 0;
	struct sigaction act;

	while((c = getopt(argc, argv, "fthc:vsd::C:S:")) != -1) {
		switch(c) {
		case 'c':
			filename=optarg;
			break;
		case 'h':
			usage(argv[0], 0);
			break;
		case '?':
			usage(argv[0], 1);
			break;
		case 'v':
			verbose++;
			break;
		case 'f':
			force++;
			break;
		case 't':
			dry_run = 1;
			break;
		case 's':
			stopmode = 1;
			break;
		case 'C':
			if (!chan_restrict(optarg))
				usage(argv[0], 1);
			break;
		case 'S':
			if (!span_restrict(optarg))
				usage(argv[0], 1);
			break;
		case 'd':
			if (optarg)
				debug = atoi(optarg);
			else
				debug = 1;	
			break;
		}
	}
	
	if (verbose) {
		fprintf(stderr, "%s\n", dahdi_tools_version);
	}

	if (!restrict_channels && only_span) {
		error("-S requires -C\n");
		goto finish;
	}
	if (!restrict_channels && !only_span) {
		bool all_assigned = wait_for_all_spans_assigned(5);

		if (!all_assigned) {
			fprintf(stderr,
				"Timeout waiting for all spans to be assigned.\n");
		}
	}

	if (fd == -1) fd = open(MASTER_DEVICE, O_RDWR);
	if (fd < 0) {
		error("Unable to open master device '%s'\n", MASTER_DEVICE);
		goto finish;
	}
	if (strcmp(filename, "-") == 0)
		cf = fdopen(STDIN_FILENO, "r");
	else
		cf = fopen(filename, "r");
	if (cf) {
		while((buf = readline())) {
			if (*buf == 10) /* skip new line */
				continue;

			if (debug & DEBUG_READER) 
				fprintf(stderr, "Line %d: %s\n", lineno, buf);

			if ((value = strchr(buf, '='))) {
				*value++ = '\0';
				value = trim(value);
				key = trim(buf);
			}

			if (!value || !*value || !*key) {
				error("Syntax error. Should be <keyword>=<value>\n");
				continue;
			}

			if (debug & DEBUG_PARSER)
				fprintf(stderr, "Keyword: [%s], Value: [%s]\n", key, value);

			found = 0;
			for (x = 0; x < sizeof(handlers) / sizeof(handlers[0]); x++) {
				if (!strcasecmp(key, handlers[x].keyword)) {
					found++;
					handlers[x].func(key, value);
					break;
				}
			}

			if (!found) 
				error("Unknown keyword '%s'\n", key);
		}
		if (debug & DEBUG_READER)
			fprintf(stderr, "<End of File>\n");
		/* fclose(cf); // causes seg fault (double free) */
	} else {
		error("Unable to open configuration file '%s'\n", filename);
	}

finish:
	if (errcnt) {
		fprintf(stderr, "\n%d error(s) detected\n\n", errcnt);
		exit(1);
	}
	if (verbose) {
		printconfig(fd);
	}

	if (dry_run)
		exit(0);
	
	if (debug & DEBUG_APPLY) {
		printf("About to open Master device\n");
		fflush(stdout);
	}

	sigemptyset(&act.sa_mask);
	act.sa_handler = signal_handler;
	act.sa_flags = SA_RESETHAND;

	if (sigaction(SIGTERM, &act, NULL) == -1) {
		perror("Failed to install SIGTERM handler.");
		exit(1);
	}
	if (sigaction(SIGINT, &act, NULL) == -1) {
		perror("Failed to install SIGINT handler.");
		exit(1);
	}

	lock = sem_open(SEM_NAME, O_CREAT, O_RDWR, 1);
	if (SEM_FAILED == lock) {
		perror("Unable to create 'dahdi_cfg' mutex");
		exit_code = 1;
		goto release_sem;
	}

	if (-1 == sem_wait(lock)) {
		perror("Failed to wait for 'dahdi_cfg' mutex");
		exit_code = 1;
		goto unlink_sem;
	}

	if (!restrict_channels && !only_span) {
		for (x=0;x<numdynamic;x++) {
			/* destroy them all */
			ioctl(fd, DAHDI_DYNAMIC_DESTROY, &zds[x]);
		}
	}

	if (stopmode) {
		for (x=0;x<spans;x++) {
			if (only_span && lc[x].span != only_span)
				continue;
			if (ioctl(fd, DAHDI_SHUTDOWN, &lc[x].span)) {
				fprintf(stderr, "DAHDI shutdown failed: %s\n", strerror(errno));
				close(fd);
				exit_code = 1;
				goto release_sem;
			}
		}
		exit_code = 1;
		goto release_sem;
	}
	for (x=0;x<spans;x++) {
		if (only_span && lc[x].span != only_span)
			continue;
		if (ioctl(fd, DAHDI_SPANCONFIG, lc + x)) {
			fprintf(stderr, "DAHDI_SPANCONFIG failed on span %d: %s (%d)\n", lc[x].span, strerror(errno), errno);
			close(fd);
			exit_code = 1;
			goto release_sem;
		}
	}

	if (!restrict_channels && !only_span) {

		sem_post(lock);

		for (x=0;x<numdynamic;x++) {
			if (ioctl(fd, DAHDI_DYNAMIC_CREATE, &zds[x])) {
				fprintf(stderr, "DAHDI dynamic span creation failed: %s\n", strerror(errno));
				close(fd);
				exit_code = 1;
				goto release_sem;
			}
			wait_for_all_spans_assigned(1);
		}

		if (-1 == sem_wait(lock)) {
			perror("Failed to wait for 'dahdi_cfg' mutex after creating dynamic spans");
			exit_code = 1;
			goto unlink_sem;
		}
	}

	for (x=1;x<DAHDI_MAX_CHANNELS;x++) {
		struct dahdi_params current_state;
		int master;
		int needupdate = force;

		if (skip_channel(x)) {
			if (debug & DEBUG_APPLY) {
				printf("Skip device %d\n", x);
				fflush(stdout);
			}
			continue;
		}
		if (debug & DEBUG_APPLY) {
			printf("Configuring device %d\n", x);
			fflush(stdout);
		}
		if (!cc[x].sigtype)
			continue;
		
		if (!needupdate) {
			memset(&current_state, 0, sizeof(current_state));
			current_state.channo = cc[x].chan | DAHDI_GET_PARAMS_RETURN_MASTER;
			if (ioctl(fd, DAHDI_GET_PARAMS, &current_state))
				needupdate = 1;
		}
		
		if (!needupdate) {
			master = current_state.channo >> 16;
			
			if (cc[x].sigtype != current_state.sigtype) {
				needupdate++;
				if (verbose > 1)
					printf("Changing signalling on channel %d from %s to %s\n",
					       cc[x].chan, sigtype_to_str(current_state.sigtype),
					       sigtype_to_str(cc[x].sigtype));
			}
			
			if ((cc[x].deflaw != DAHDI_LAW_DEFAULT) && (cc[x].deflaw != current_state.curlaw)) {
				needupdate++;
				if (verbose > 1)
					printf("Changing law on channel %d from %s to %s\n",
					       cc[x].chan, laws[current_state.curlaw],
					       laws[cc[x].deflaw]);
			}
			
			if (cc[x].master != master) {
				needupdate++;
				if (verbose > 1)
					printf("Changing master of channel %d from %d to %d\n",
					       cc[x].chan, master,
					       cc[x].master);
			}
			
			if (cc[x].idlebits != current_state.idlebits) {
				needupdate++;
				if (verbose > 1)
					printf("Changing idle bits of channel %d from %d to %d\n",
					       cc[x].chan, current_state.idlebits,
					       cc[x].idlebits);
			}
		}
		
		if (needupdate && ioctl(fd, DAHDI_CHANCONFIG, &cc[x])) {
			fprintf(stderr, "DAHDI_CHANCONFIG failed on channel %d: %s (%d)\n", x, strerror(errno), errno);
			if (errno == EINVAL) {
				/* give helpful suggestions on signaling errors */
				fprintf(stderr, "Selected signaling not "
						"supported\n");
				fprintf(stderr, "Possible causes:\n");
				switch(cc[x].sigtype) {
				case DAHDI_SIG_FXOKS:
				case DAHDI_SIG_FXOLS:
				case DAHDI_SIG_FXOGS:
					fprintf(stderr, "\tFXO signaling is "
						"being used on a FXO interface"
						" (use a FXS signaling variant"
						")\n");
					fprintf(stderr, "\tRBS signaling is "
						"being used on a E1 CCS span"
						"\n");
					break;
				case DAHDI_SIG_FXSKS:
				case DAHDI_SIG_FXSLS:
				case DAHDI_SIG_FXSGS:
					fprintf(stderr, "\tFXS signaling is "
						"being used on a FXS interface"
						" (use a FXO signaling variant"
						")\n");
					fprintf(stderr, "\tRBS signaling is "
						"being used on a E1 CCS span"
						"\n");
					break;
				case DAHDI_SIG_EM:
					fprintf(stderr, "\te&m signaling is "
						"being used on a E1 line (use"
						" e&me1)\n");
					break;
				case DAHDI_SIG_EM_E1:
					fprintf(stderr, "\te&me1 signaling is "
						"being used on a T1 line (use "
						"e&m)\n");
					fprintf(stderr, "\tRBS signaling is "
						"being used on a E1 CCS span"
						"\n");
					break;
				case DAHDI_SIG_HARDHDLC:
					fprintf(stderr, "\thardhdlc is being "
						"used on a TE12x (use dchan)\n"
						);
					break;
				case DAHDI_SIG_HDLCFCS:
					fprintf(stderr, "\tdchan is being used"
						" on a BRI span (use hardhdlc)"
						"\n");
					break;
				default:
					break;
				}
				fprintf(stderr, "\tSignaling is being assigned"
					" to channel 16 of an E1 CAS span\n");
			}
			close(fd);
			exit_code = 1;
			goto release_sem;
		}

		ae[x].chan = x;
		if (verbose) {
			printf("Setting echocan for channel %d to %s\n", ae[x].chan, ae[x].echocan[0] ? ae[x].echocan : "none");
		}

		if (ioctl(fd, DAHDI_ATTACH_ECHOCAN, &ae[x])) {
			fprintf(stderr, "DAHDI_ATTACH_ECHOCAN failed on channel %d: %s (%d)\n", x, strerror(errno), errno);
			close(fd);
			exit_code = 1;
			goto release_sem;
		}
	}
	if (0 == numzones) {
		/* Default to the us zone if one wasn't specified. */
		dahdi_copy_string(zonestoload[numzones++], "us", sizeof(zonestoload[0]));
		deftonezone = 0;
	}

	for (x=0;x<numzones;x++) {
		if (debug & DEBUG_APPLY) {
			printf("Loading tone zone for %s\n", zonestoload[x]);
			fflush(stdout);
		}
		if (tone_zone_register(fd, zonestoload[x])) {
			if (errno != EBUSY)
				error("Unable to register tone zone '%s'\n", zonestoload[x]);
		}
	}
	if (debug & DEBUG_APPLY) {
		printf("Doing startup\n");
		fflush(stdout);
	}
	if (deftonezone > -1) {
		if (ioctl(fd, DAHDI_DEFAULTZONE, &deftonezone)) {
			fprintf(stderr, "DAHDI_DEFAULTZONE failed: %s (%d)\n", strerror(errno), errno);
			close(fd);
			exit_code = 1;
			goto release_sem;
		}
	}
	for (x=0;x<spans;x++) {
		if (only_span && lc[x].span != only_span)
			continue;
		if (ioctl(fd, DAHDI_STARTUP, &lc[x].span)) {
			fprintf(stderr, "DAHDI startup failed: %s\n", strerror(errno));
			close(fd);
			exit_code = 1;
			goto release_sem;
		}
	}
	exit_code = apply_fiftysix();

release_sem:
	if (SEM_FAILED != lock)
		sem_post(lock);

unlink_sem:
	if (SEM_FAILED != lock)
		sem_unlink(SEM_NAME);
	exit(exit_code);
}