/*	$OpenBSD: acu.c,v 1.13 2006/10/18 21:18:59 deraadt Exp $	*/
/*	$NetBSD: acu.c,v 1.4 1996/12/29 10:34:03 cgd Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)acu.c	8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] = "$OpenBSD: acu.c,v 1.13 2006/10/18 21:18:59 deraadt Exp $";
#endif /* not lint */

#include "tip.h"

static acu_t *acu = NOACU;
static int conflag;
static void acuabort(int);
static acu_t *acutype(char *);
static jmp_buf jmpbuf;
/*
 * Establish connection for tip
 *
 * If DU is true, we should dial an ACU whose type is AT.
 * The phone numbers are in PN, and the call unit is in CU.
 *
 * If the PN is an '@', then we consult the PHONES file for
 *   the phone numbers.  This file is /etc/phones, unless overriden
 *   by an exported shell variable.
 *
 * The data base files must be in the format:
 *	host-name[ \t]*phone-number
 *   with the possibility of multiple phone numbers
 *   for a single host acting as a rotary (in the order
 *   found in the file).
 */
char *
con(void)
{
	char *cp = PN;
	char *phnum, string[256];
	FILE *fp;
	volatile int tried = 0;

	if (!DU) {		/* regular connect message */
		if (CM != NOSTR)
			parwrite(FD, CM, size(CM));
		logent(value(HOST), "", DV, "call completed");
		return (NOSTR);
	}
	/*
	 * @ =>'s use data base in PHONES environment variable
	 *        otherwise, use /etc/phones
	 */
	signal(SIGINT, acuabort);
	signal(SIGQUIT, acuabort);
	if (setjmp(jmpbuf)) {
		signal(SIGINT, SIG_IGN);
		signal(SIGQUIT, SIG_IGN);
		printf("\ncall aborted\n");
		logent(value(HOST), "", "", "call aborted");
		if (acu != NOACU) {
			setboolean(value(VERBOSE), FALSE);
			if (conflag)
				disconnect(NOSTR);
			else
				(*acu->acu_abort)();
		}
		return ("interrupt");
	}
	if ((acu = acutype(AT)) == NOACU)
		return ("unknown ACU type");
	if (*cp != '@') {
		while (*cp) {
			phnum = cp;
			cp = strpbrk(cp, ",");
			if (*cp != '\0')
				*cp++ = '\0';

			if (strlen(phnum) == 0)
				continue;

			conflag = (*acu->acu_dialer)(phnum, CU);
			if (conflag)
				break;

			logent(value(HOST), phnum, acu->acu_name, "call failed");
			tried++;
		}
	} else {
		if ((fp = fopen(PH, "r")) == NOFILE) {
			printf("%s: ", PH);
			return ("can't open phone number file");
		}
		while (fgets(string, sizeof(string), fp) != NOSTR) {
			cp = &string[strcspn(string, " \t\n")];
			if (*cp != '\0')
				*cp++ = '\0';

			if (strcmp(string, value(HOST)) != 0)
				continue;

			cp += strspn(cp, " \t\n");
			phnum = cp;
			*(cp + strcspn(cp, ",\n")) = '\0';

			if (strlen(phnum) == 0)
				continue;

			conflag = (*acu->acu_dialer)(phnum, CU);
			if (conflag)
				break;

			logent(value(HOST), phnum, acu->acu_name, "call failed");
			tried++;
		}
		fclose(fp);
	}
	if (conflag) {
		if (CM != NOSTR)
			parwrite(FD, CM, size(CM));
		logent(value(HOST), phnum, acu->acu_name, "call completed");
		return (NOSTR);
	} else if (!tried) {
		logent(value(HOST), "", acu->acu_name, "missing phone number");
		return ("missing phone number");
	} else {
		(*acu->acu_abort)();
		return ("call failed");
	}
}

void
disconnect(char *reason)
{
	if (!conflag) {
		logent(value(HOST), "", DV, "call terminated");
		return;
	}
	if (reason == NOSTR) {
		logent(value(HOST), "", acu->acu_name, "call terminated");
		if (boolean(value(VERBOSE)))
			printf("\r\ndisconnecting...");
	} else
		logent(value(HOST), "", acu->acu_name, reason);
	(*acu->acu_disconnect)();
}

static void
acuabort(int s)
{
	signal(s, SIG_IGN);
	longjmp(jmpbuf, 1);
}

static acu_t *
acutype(char *s)
{
	acu_t *p;
	extern acu_t acutable[];

	for (p = acutable; p->acu_name != '\0'; p++)
		if (!strcmp(s, p->acu_name))
			return (p);
	return (NOACU);
}