/*      $OpenBSD: acu.c,v 1.12 2006/03/17 14:43:06 moritz Exp $ */
/*      $NetBSD: acu.c,v 1.4 1996/12/29 10:34:03 cgd Exp $      */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */

#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 overridden
 *   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 *fd;
        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 += strcspn(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 ((fd = fopen(PH, "r")) == NOFILE) {
                        printf("%s: ", PH);
                        return ("can't open phone number file");
                }
                while (fgets(string, sizeof(string), fd) != 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(fd);
        }
        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 != NULL; p++)
                if (!strcmp(s, p->acu_name))
                        return (p);
        return (NOACU);
}