/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved	*/

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <termio.h>
#include <sys/stat.h>
#include <signal.h>
#include <stdarg.h>

#include "tmstruct.h"
#include "tmextern.h"
#include "ttymon.h"

static	int  nflg = 0;		/* -n seen */
static	int  iflg = 0;		/* -i seen */
static	int  fflg = 0;		/* -f seen */
static	int  lflg = 0;		/* -l seen */

static	void	usage(void);
static	void	check_ref(void);
static	void	add_entry(struct Gdef *) __NORETURN;
static	void	remove_entry(char *);
static	int	copy_file(FILE *, FILE *, int, int);
static	int	verify(char *, int);
static	FILE	*open_temp(char *);

/*
 *	sttydefs - add, remove or check entries in /etc/ttydefs
 *
 *	Usage:	   sttydefs -a ttylabel [-n nextlabel] [-i initail-flags]
 *			    [-f final-flags] [-b]
 *		   sttydefs -r ttylabel
 *		   sttydefs -l [ttylabel]
 *
 */

int
main(int argc, char *argv[])
{
	int c;			/* option letter */
	int errflg = 0;		/* error indicator */
	int  aflg = 0;		/* -a seen */
	int  bflg = 0;		/* -b seen */
	int	ret;
	const char *argtmp;
	char	*nextlabel;
	struct Gdef ttydef, *ptr;

	if (argc == 1)
		usage();

	/* Initialize ttydef structure */
	memset(&ttydef, 0, sizeof (ttydef));

	ptr = &ttydef;
	while ((c = getopt(argc, argv, "a:n:i:f:br:l")) != -1) {
		switch (c) {
		case 'a':
			aflg = TRUE;
			ptr->g_id = optarg;
			break;
		case 'n':
			nflg = TRUE;
			ptr->g_nextid = optarg;
			break;
		case 'i':
			iflg = TRUE;
			ptr->g_iflags = optarg;
			break;
		case 'f':
			fflg = TRUE;
			ptr->g_fflags = optarg;
			break;
		case 'b':
			bflg = TRUE;
			ptr->g_autobaud |= A_FLAG;
			break;
		case 'r':
			if ((argc > 3) || (optind < argc))
				usage();
			remove_entry(optarg);
			break;
		case 'l':
			lflg = TRUE;
			if (argc > 3)
				usage();
			if ((ret = check_version(TTYDEFS_VERS, TTYDEFS)) != 0) {
				if (ret != 2) {
					(void) fprintf(stderr,
					    "%s version number is incorrect "
					    "or missing.\n", TTYDEFS);
					exit(1);
				}
				(void) fprintf(stderr,
				    "sttydefs: can't open %s.\n", TTYDEFS);
				exit(1);
			}
			if (argv[optind] == NULL) {
				read_ttydefs(NULL, TRUE);
				printf("\n");
				check_ref();
			} else {
				if (argc == 3) { /* -l ttylabel */
					if (verify(argv[optind], 0) != 0) {
						errflg++;
						break;
					}
					argtmp = argv[optind];
				} else { /* -lttylabel */
					argtmp = argv[optind] + 2;
				}
				read_ttydefs(argtmp, TRUE);
				if (Ndefs == 0) {
					(void) fprintf(stderr,
					    "ttylabel <%s> not found.\n",
					    argtmp);
					exit(1);
				}
				nextlabel = Gdef[--Ndefs].g_nextid;
				Ndefs = 0;
				read_ttydefs(nextlabel, FALSE);
				if (Ndefs == 0) {
					(void) printf("\nWarning -- nextlabel "
					    "<%s> of <%s> does not reference "
					    "any existing ttylabel.\n",
					    nextlabel, argtmp);
				}
			}
			exit(0);
		case '?':
			errflg++;
			break;
		} /* end switch */
		if (errflg)
			usage();
	} /* end while */
	if (optind < argc)
		usage();

	if (aflg) {
		add_entry(ptr);		/* never return */
	}
	if ((iflg) || (fflg) || (bflg) || (nflg))
		usage();
	return (0);
}

/*
 *	verify	- to check if arg is valid
 *		- i.e. arg cannot start with '-' and
 *		  arg must not longer than maxarglen
 *		- return 0 if ok. Otherwise return -1
 */
static	int
verify(char *arg, int maxarglen)
{
	if (*arg == '-') {
		(void) fprintf(stderr, "Invalid argument -- %s.\n", arg);
		return (-1);
	}
	if ((maxarglen) && ((int)strlen(arg) > maxarglen)) {
		arg[maxarglen] = '\0';
		(void) fprintf(stderr, "string too long, truncated to %s.\n",
		    arg);
		return (-1);
	}
	return (0);
}

/*
 * usage - print out a usage message
 */

static	void
usage(void)
{
	(void) fprintf(stderr, "Usage:\tsttydefs -a ttylabel [-n nextlabel] "
	    "[-i initial-flags]\n\t\t [-f final-flags] [-b]\n");
	(void) fprintf(stderr, "\tsttydefs -r ttylabel\n");
	(void) fprintf(stderr, "\tsttydefs -l [ttylabel]\n");
	exit(2);
}

/*
 *	add_entry - add an entry to /etc/ttydefs
 */

static	void
add_entry(struct Gdef *ttydef)
{
	FILE *fp;
	int	errflg = 0;
	char tbuf[BUFSIZ], *tp;
	int  add_version = FALSE;

	if (getuid()) {
		(void) fprintf(stderr, "User not privileged for operation.\n");
		exit(1);
	}
	tp = tbuf;
	*tp = '\0';
	if ((fp = fopen(TTYDEFS, "r")) != NULL) {
		if (check_version(TTYDEFS_VERS, TTYDEFS) != 0) {
			(void) fprintf(stderr,
			    "%s version number is incorrect or missing.\n",
			    TTYDEFS);
			exit(1);
		}
		if (find_label(fp, ttydef->g_id)) {
			(void) fclose(fp);
			(void) fprintf(stderr,
			    "Invalid request -- ttylabel <%s> already "
			    "exists.\n",
			    ttydef->g_id);
			exit(1);
		}
		(void) fclose(fp);
	} else  {
		add_version = TRUE;
	}
	if ((fp = fopen(TTYDEFS, "a+")) == NULL) {
		(void) fprintf(stderr, "Could not open \"%s\": %s", TTYDEFS,
		    strerror(errno));
		exit(1);
	}

	if (add_version) {
		(void) fprintf(fp, "# VERSION=%d\n", TTYDEFS_VERS);
	}


	/* if optional fields are not provided, set to default */
	if (!iflg)
		ttydef->g_iflags = DEFAULT.g_iflags;
	else
		if (check_flags(ttydef->g_iflags) != 0)
			errflg++;
	if (!fflg)
		ttydef->g_fflags = DEFAULT.g_fflags;
	else
		if (check_flags(ttydef->g_fflags) != 0)
			errflg++;
	if (errflg)
		exit(1);

	if (!nflg)
		ttydef->g_nextid = ttydef->g_id;

	if (ttydef->g_autobaud & A_FLAG)  {
		(void) fprintf(fp, "%s:%s:%s:A:%s\n", ttydef->g_id,
		    ttydef->g_iflags, ttydef->g_fflags, ttydef->g_nextid);
	} else {
		(void) fprintf(fp, "%s:%s:%s::%s\n", ttydef->g_id,
		    ttydef->g_iflags, ttydef->g_fflags, ttydef->g_nextid);
	}
	(void) fclose(fp);
	exit(0);
}

static	void
remove_entry(char *ttylabel)
{
	FILE *tfp;		/* file pointer for temp file */
	int line;		/* line number entry is on */
	FILE *fp;		/* scratch file pointer */
	char *tname = "/etc/.ttydefs";

	if (getuid()) {
		(void) fprintf(stderr, "User not privileged for operation.\n");
		exit(1);
	}
	fp = fopen(TTYDEFS, "r");
	if (fp == NULL) {
		(void) fprintf(stderr, "Could not open \"%s\": %s", TTYDEFS,
		    strerror(errno));
		exit(1);
	}
	if (check_version(TTYDEFS_VERS, TTYDEFS) != 0) {
		(void) fprintf(stderr,
		    "%s version number is incorrect or missing.\n", TTYDEFS);
		exit(1);
	}
	if ((line = find_label(fp, ttylabel)) == 0) {
		(void) fprintf(stderr,
		    "Invalid request, ttylabel <%s> does not exist.\n",
		    ttylabel);
		exit(1);
	}
	tfp = open_temp(tname);
	if (line != 1)
		if (copy_file(fp, tfp, 1, line - 1)) {
			(void) fprintf(stderr, "Error accessing temp file.\n");
			exit(1);
		}
	if (copy_file(fp, tfp, line + 1, -1)) {
		(void) fprintf(stderr, "Error accessing temp file.\n");
		exit(1);
	}
	(void) fclose(fp);
	if (fclose(tfp) == EOF) {
		(void) unlink(tname);
		(void) fprintf(stderr, "Error closing temp file.\n");
		exit(1);
	}
	(void) unlink(TTYDEFS);
	if (rename(tname, TTYDEFS) != 0) {
		perror("Rename failed");
		(void) unlink(tname);
		exit(1);
	}
	exit(0);
}

/*
 * open_temp - open up a temp file
 *
 *	args:	tname - temp file name
 */

static	FILE *
open_temp(char *tname)
{
	FILE *fp;			/* fp associated with tname */
	struct sigaction sigact;	/* for signal handling */

	sigact.sa_flags = 0;
	sigact.sa_handler = SIG_IGN;
	(void) sigemptyset(&sigact.sa_mask);
	(void) sigaddset(&sigact.sa_mask, SIGHUP);
	(void) sigaddset(&sigact.sa_mask, SIGINT);
	(void) sigaddset(&sigact.sa_mask, SIGQUIT);
	(void) sigaction(SIGHUP, &sigact, NULL);
	(void) sigaction(SIGINT, &sigact, NULL);
	(void) sigaction(SIGQUIT, &sigact, NULL);
	(void) umask(0333);
	if (access(tname, 0) != -1) {
		(void) fprintf(stderr, "tempfile busy; try again later.\n");
		exit(1);
	}
	fp = fopen(tname, "w");
	if (fp == NULL) {
		perror("Cannot create tempfile");
		exit(1);
	}
	return (fp);
}

/*
 * copy_file - copy information from one file to another, return 0 on
 *	success, -1 on failure
 *
 *	args:	fp - source file's file pointer
 *		tfp - destination file's file pointer
 *		start - starting line number
 *		finish - ending line number (-1 indicates entire file)
 */


static	int
copy_file(FILE *fp, FILE *tfp, int start, int finish)
{
	int i;		/* loop variable */
	char dummy[BUFSIZ];	/* scratch buffer */

/*
 * always start from the beginning because line numbers are absolute
 */

	rewind(fp);

/*
 * get to the starting point of interest
 */

	if (start != 1) {
		for (i = 1; i < start; i++)
			if (!fgets(dummy, BUFSIZ, fp))
				return (-1);
	}

/*
 * copy as much as was requested
 */

	if (finish != -1) {
		for (i = start; i <= finish; i++) {
			if (!fgets(dummy, BUFSIZ, fp))
				return (-1);
			if (fputs(dummy, tfp) == EOF)
				return (-1);
		}
	} else {
		for (;;) {
			if (fgets(dummy, BUFSIZ, fp) == NULL) {
				if (feof(fp))
					break;
				else
					return (-1);
			}
			if (fputs(dummy, tfp) == EOF)
				return (-1);
		}
	}
	return (0);
}

/*
 *	check_ref	- to check if nextlabel are referencing
 *			  existing ttylabel
 */
static	void
check_ref(void)
{
	int	i;
	struct	Gdef	*np;

	np = &Gdef[0];
	for (i = 0; i < Ndefs; i++, np++) {
		if (find_def(np->g_nextid) == NULL) {
			(void) printf("Warning -- nextlabel <%s> of <%s> "
			    "does not reference any existing ttylabel.\n",
			    np->g_nextid, np->g_id);
		}
	}
}

/*
 *	log	- print a message to stdout
 */

void
log(const char *msg, ...)
{
	va_list ap;
	if (lflg) {
		va_start(ap, msg);
		(void) vprintf(msg, ap);
		va_end(ap);
		(void) printf("\n");
	} else {
		va_start(ap, msg);
		(void) vfprintf(stderr, msg, ap);
		va_end(ap);
		(void) fprintf(stderr, "\n");
	}
}