/*      $NetBSD: v831.c,v 1.13 2016/06/30 05:56:46 dholland 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)v831.c      8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: v831.c,v 1.13 2016/06/30 05:56:46 dholland Exp $");
#endif /* not lint */

/*
 * Routines for dialing up on Vadic 831
 */
#include "tip.h"

static jmp_buf jmpbuf;
static int child = -1;

static  void    alarmtr(int);
static  int     dialit(char *, char *);
static  char   *sanitize(char *);

int
v831_dialer(char *num, char *acu)
{
        int status, mypid;
        int timelim;

        if (boolean(value(VERBOSE)))
                (void)printf("\nstarting call...");
#ifdef DEBUG
        (void)printf("(acu=%s)\n", acu);
#endif
        if ((AC = open(acu, O_RDWR)) < 0) {
                if (errno == EBUSY)
                        (void)printf("line busy...");
                else
                        (void)printf("acu open error...");
                return (0);
        }
        if (setjmp(jmpbuf)) {
                (void)kill(child, SIGKILL);
                (void)close(AC);
                return (0);
        }
        (void)signal(SIGALRM, alarmtr);
        timelim = 5 * strlen(num);
        (void)alarm((unsigned)(timelim < 30 ? 30 : timelim));
        if ((child = fork()) == 0) {
                /*
                 * ignore this stuff for aborts
                 */
                (void)signal(SIGALRM, SIG_IGN);
                (void)signal(SIGINT, SIG_IGN);
                (void)signal(SIGQUIT, SIG_IGN);
                (void)sleep(2);
                exit(dialit(num, acu) != 'A');
        }
        /*
         * open line - will return on carrier
         */
        if ((FD = open(DV, O_RDWR)) < 0) {
#ifdef DEBUG
                (void)printf("(after open, errno=%d)\n", errno);
#endif
                if (errno == EIO)
                        (void)printf("lost carrier...");
                else
                        (void)printf("dialup line open failed...");
                (void)alarm(0);
                (void)kill(child, SIGKILL);
                (void)close(AC);
                return (0);
        }
        (void)alarm(0);
        (void)signal(SIGALRM, SIG_DFL);
        while ((mypid = wait(&status)) != child && mypid != -1)
                ;
        if (status) {
                (void)close(AC);
                return (0);
        }
        return (1);
}

static void
/*ARGSUSED*/
alarmtr(int dummy __unused)
{

        (void)alarm(0);
        longjmp(jmpbuf, 1);
}

/*
 * Insurance, for some reason we don't seem to be
 *  hanging up...
 */
void
v831_disconnect(void)
{
        struct termios  cntrl;

        (void)sleep(2);
#ifdef DEBUG
        (void)printf("[disconnect: FD=%d]\n", FD);
#endif
        if (FD > 0) {
                (void)ioctl(FD, TIOCCDTR, 0);
                (void)tcgetattr(FD, &cntrl);
                (void)cfsetospeed(&cntrl, 0);
                (void)cfsetispeed(&cntrl, 0);
                (void)tcsetattr(FD, TCSAFLUSH, &cntrl);
                (void)ioctl(FD, TIOCNXCL, NULL);
        }
        (void)close(FD);
}

void
v831_abort(void)
{

#ifdef DEBUG
        (void)printf("[abort: AC=%d]\n", AC);
#endif
        (void)sleep(2);
        if (child > 0)
                (void)kill(child, SIGKILL);
        if (AC > 0)
                (void)ioctl(FD, TIOCNXCL, NULL);
                (void)close(AC);
        if (FD > 0)
                (void)ioctl(FD, TIOCCDTR, 0);
        (void)close(FD);
}

/*
 * Sigh, this probably must be changed at each site.
 */
struct vaconfig {
        const char      *vc_name;
        char    vc_rack;
        char    vc_modem;
} vaconfig[] = {
        { "/dev/cua0",'4','0' },
        { "/dev/cua1",'4','1' },
        { 0, '\0', '\0' }
};

#define pc(x)   (void)(c = x, write(AC,&c,1))
#define ABORT   01
#define SI      017
#define STX     02
#define ETX     03

static int
dialit(char *phonenum, char *acu)
{
        struct vaconfig *vp;
        struct termios cntrl;
        char c;
        int i;

        phonenum = sanitize(phonenum);
#ifdef DEBUG
        (void)printf("(dial phonenum=%s)\n", phonenum);
#endif
        if (*phonenum == '<' && phonenum[1] == 0)
                return ('Z');
        for (vp = vaconfig; vp->vc_name; vp++)
                if (strcmp(vp->vc_name, acu) == 0)
                        break;
        if (vp->vc_name == 0) {
                (void)printf("Unable to locate dialer (%s)\n", acu);
                return ('K');
        }
        (void)tcgetattr(AC, &cntrl);
        (void)cfsetospeed(&cntrl, B2400);
        (void)cfsetispeed(&cntrl, B2400);
        cntrl.c_cflag |= PARODD | PARENB;
        cntrl.c_lflag &= ~(ISIG | ICANON);
        (void)tcsetattr(AC, TCSANOW, &cntrl);
        (void)tcflush(AC, TCIOFLUSH);
        pc(STX);
        pc(vp->vc_rack);
        pc(vp->vc_modem);
        while (*phonenum && *phonenum != '<')
                pc(*phonenum++);
        pc(SI);
        pc(ETX);
        (void)sleep(1);
        i = read(AC, &c, 1);
#ifdef DEBUG
        (void)printf("read %d chars, char=%c, errno %d\n", i, c, errno);
#endif
        if (i != 1)
                c = 'M';
        if (c == 'B' || c == 'G') {
                char cc, oc = c;

                pc(ABORT);
                (void)read(AC, &cc, 1);
#ifdef DEBUG
                (void)printf("abort response=%c\n", cc);
#endif
                c = oc;
                v831_disconnect();
        }
        (void)close(AC);
#ifdef DEBUG
        (void)printf("dialit: returns %c\n", c);
#endif
        return (c);
}

static char *
sanitize(char *s)
{
        static char buf[128];
        char *cp;

        for (cp = buf; *s && buf + sizeof buf - cp > 1; s++) {
                if (!isdigit((unsigned char)*s) && *s != '<' && *s != '_')
                        continue;
                if (*s == '_')
                        *s = '=';
                *cp++ = *s;
        }
        *cp++ = 0;
        return (buf);
}