/*      $OpenBSD: t3000.c,v 1.14 2006/03/17 19:17:13 moritz Exp $       */
/*      $NetBSD: t3000.c,v 1.5 1997/02/11 09:24:18 mrg Exp $    */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992, 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.
 */

/*
 * Routines for calling up on a Telebit T3000 modem.
 * Derived from Courier driver.
 */
#include "tip.h"

#include <sys/ioctl.h>
#include <stdio.h>

#define MAXRETRY        5

static  int dialtimeout = 0;
static  int connected = 0;
static  jmp_buf timeoutbuf;

static void     sigALRM(int);
static int      t3000_swallow(char *);
static int      t3000_connect(void);
static int      t3000_sync(void);
static void     t3000_write(int, char *, int);
static void     t3000_nap(void);
#ifdef DEBUG
static void     t3000_verbose_read(void);
#endif

int
t3000_dialer(char *num, char *acu)
{
        char *cp;
        struct termios cntrl;
#ifdef ACULOG
        char line[80];
#endif

        if (boolean(value(VERBOSE)))
                printf("Using \"%s\"\n", acu);

        tcgetattr(FD, &cntrl);
        cntrl.c_cflag |= HUPCL;
        tcsetattr(FD, TCSANOW, &cntrl);
        /*
         * Get in synch.
         */
        if (!t3000_sync()) {
badsynch:
                printf("can't synchronize with t3000\n");
#ifdef ACULOG
                logent(value(HOST), num, "t3000", "can't synch up");
#endif
                return (0);
        }
        t3000_write(FD, "AT E0\r", 6);  /* turn off echoing */
        sleep(1);
#ifdef DEBUG
        if (boolean(value(VERBOSE)))
                t3000_verbose_read();
#endif
        tcflush(FD, TCIOFLUSH);
        t3000_write(FD, "AT E0 H0 Q0 X4 V1\r", 18);
        if (!t3000_swallow("\r\nOK\r\n"))
                goto badsynch;
        fflush(stdout);
        t3000_write(FD, "AT D", 4);
        for (cp = num; *cp; cp++)
                if (*cp == '=')
                        *cp = ',';
        t3000_write(FD, num, strlen(num));
        t3000_write(FD, "\r", 1);
        connected = t3000_connect();
#ifdef ACULOG
        if (dialtimeout) {
                (void)snprintf(line, sizeof line, "%ld second dial timeout",
                        number(value(DIALTIMEOUT)));
                logent(value(HOST), num, "t3000", line);
        }
#endif
        if (dialtimeout)
                t3000_disconnect();
        return (connected);
}

void
t3000_disconnect(void)
{
         /* first hang up the modem*/
        ioctl(FD, TIOCCDTR, 0);
        sleep(1);
        ioctl(FD, TIOCSDTR, 0);
        t3000_sync();                           /* reset */
        close(FD);
}

void
t3000_abort(void)
{
        t3000_write(FD, "\r", 1);       /* send anything to abort the call */
        t3000_disconnect();
}

/*ARGSUSED*/
static void
sigALRM(int signo)
{
        printf("\07timeout waiting for reply\n");
        dialtimeout = 1;
        longjmp(timeoutbuf, 1);
}

static int
t3000_swallow(char *match)
{
        sig_t f;
        char c;

        f = signal(SIGALRM, sigALRM);
        dialtimeout = 0;
        do {
                if (*match =='\0') {
                        signal(SIGALRM, f);
                        return (1);
                }
                if (setjmp(timeoutbuf)) {
                        signal(SIGALRM, f);
                        return (0);
                }
                alarm(number(value(DIALTIMEOUT)));
                read(FD, &c, 1);
                alarm(0);
                c &= 0177;
#ifdef DEBUG
                if (boolean(value(VERBOSE)))
                        putchar(c);
#endif
        } while (c == *match++);
#ifdef DEBUG
        if (boolean(value(VERBOSE)))
                fflush(stdout);
#endif
        signal(SIGALRM, SIG_DFL);
        return (0);
}

#ifndef B19200          /* XXX */
#define B19200  EXTA
#define B38400  EXTB
#endif

struct tbaud_msg {
        char *msg;
        int baud;
        int baud2;
} tbaud_msg[] = {
        { "",           B300,   0 },
        { " 1200",      B1200,  0 },
        { " 2400",      B2400,  0 },
        { " 4800",      B4800,  0 },
        { " 9600",      B9600,  0 },
        { " 14400",     B19200, B9600 },
        { " 19200",     B19200, B9600 },
        { " 38400",     B38400, B9600 },
        { " 57600",     B38400, B9600 },
        { " 7512",      B9600,  0 },
        { " 1275",      B2400,  0 },
        { " 7200",      B9600,  0 },
        { " 12000",     B19200, B9600 },
        { 0,            0,      0 },
};

static int
t3000_connect(void)
{
        char c;
        int nc, nl, n;
        char dialer_buf[64];
        struct tbaud_msg *bm;
        sig_t f;

        if (t3000_swallow("\r\n") == 0)
                return (0);
        f = signal(SIGALRM, sigALRM);
again:
        nc = 0; nl = sizeof(dialer_buf)-1;
        bzero(dialer_buf, sizeof(dialer_buf));
        dialtimeout = 0;
        for (nc = 0, nl = sizeof(dialer_buf)-1 ; nl > 0 ; nc++, nl--) {
                if (setjmp(timeoutbuf))
                        break;
                alarm(number(value(DIALTIMEOUT)));
                n = read(FD, &c, 1);
                alarm(0);
                if (n <= 0)
                        break;
                c &= 0x7f;
                if (c == '\r') {
                        if (t3000_swallow("\n") == 0)
                                break;
                        if (!dialer_buf[0])
                                goto again;
                        if (strcmp(dialer_buf, "RINGING") == 0 &&
                            boolean(value(VERBOSE))) {
#ifdef DEBUG
                                printf("%s\r\n", dialer_buf);
#endif
                                goto again;
                        }
                        if (strncmp(dialer_buf, "CONNECT",
                                    sizeof("CONNECT")-1) != 0)
                                break;
                        for (bm = tbaud_msg ; bm->msg ; bm++)
                                if (strcmp(bm->msg,
                                    dialer_buf+sizeof("CONNECT")-1) == 0) {
                                        struct termios  cntrl;

                                        tcgetattr(FD, &cntrl);
                                        cfsetospeed(&cntrl, bm->baud);
                                        cfsetispeed(&cntrl, bm->baud);
                                        tcsetattr(FD, TCSAFLUSH, &cntrl);
                                        signal(SIGALRM, f);
#ifdef DEBUG
                                        if (boolean(value(VERBOSE)))
                                                printf("%s\r\n", dialer_buf);
#endif
                                        return (1);
                                }
                        break;
                }
                dialer_buf[nc] = c;
#ifdef notdef
                if (boolean(value(VERBOSE)))
                        putchar(c);
#endif
        }
        printf("%s\r\n", dialer_buf);
        signal(SIGALRM, f);
        return (0);
}

/*
 * This convoluted piece of code attempts to get
 * the t3000 in sync.
 */
static int
t3000_sync(void)
{
        int already = 0;
        int len;
        char buf[40];

        while (already++ < MAXRETRY) {
                tcflush(FD, TCIOFLUSH);
                t3000_write(FD, "\rAT Z\r", 6); /* reset modem */
                bzero(buf, sizeof(buf));
                sleep(2);
                ioctl(FD, FIONREAD, &len);
#if 1
if (len == 0) len = 1;
#endif
                if (len) {
                        len = read(FD, buf, sizeof(buf));
#ifdef DEBUG
                        buf[len] = '\0';
                        printf("t3000_sync: (\"%s\")\n\r", buf);
#endif
                        if (strchr(buf, '0') || 
                           (strchr(buf, 'O') && strchr(buf, 'K')))
                                return(1);
                }
                /*
                 * If not strapped for DTR control,
                 * try to get command mode.
                 */
                sleep(1);
                t3000_write(FD, "+++", 3);
                sleep(1);
                /*
                 * Toggle DTR to force anyone off that might have left
                 * the modem connected.
                 */
                ioctl(FD, TIOCCDTR, 0);
                sleep(1);
                ioctl(FD, TIOCSDTR, 0);
        }
        t3000_write(FD, "\rAT Z\r", 6);
        return (0);
}

static void
t3000_write(int fd, char *cp, int n)
{
#ifdef notdef
        if (boolean(value(VERBOSE)))
                write(1, cp, n);
#endif
        tcdrain(fd);
        t3000_nap();
        for ( ; n-- ; cp++) {
                write(fd, cp, 1);
                tcdrain(fd);
                t3000_nap();
        }
}

#ifdef DEBUG
static void
t3000_verbose_read(void)
{
        int n = 0;
        char buf[BUFSIZ];

        if (ioctl(FD, FIONREAD, &n) < 0)
                return;
        if (n <= 0)
                return;
        if (read(FD, buf, n) != n)
                return;
        write(1, buf, n);
}
#endif

/* Give the t3000 50 milliseconds between characters */
static void
t3000_nap(void)
{
        struct timespec ts;

        ts.tv_sec = 0;
        ts.tv_nsec = 50 * 1000000;

        nanosleep(&ts, NULL);
}