usr.bin/tip/aculib/courier.c

/*
 * Copyright (c) 1986 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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
static char sccsid[] = "@(#)courier.c   5.7 (Berkeley) 3/2/91";
#endif /* not lint */

/*
 * Routines for calling up on a Courier modem.
 * Derived from Hayes driver.
 */
#include "tip.h"
#include <stdio.h>

#define MAXRETRY        5

static  void sigALRM();
static  int timeout = 0;
static  int connected = 0;
static  jmp_buf timeoutbuf, intbuf;
static  int coursync();

cour_dialer(num, acu)
        register char *num;
        char *acu;
{
        register char *cp;
#ifdef ACULOG
        char line[80];
#endif
        static int cour_connect(), cour_swallow();

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

        ioctl(FD, TIOCHPCL, 0);
        /*
         * Get in synch.
         */
        if (!coursync()) {
badsynch:
                printf("can't synchronize with courier\n");
#ifdef ACULOG
                logent(value(HOST), num, "courier", "can't synch up");
#endif
                return (0);
        }
        cour_write(FD, "AT E0\r", 6);   /* turn off echoing */
        sleep(1);
#ifdef DEBUG
        if (boolean(value(VERBOSE)))
                verbose_read();
#endif
        ioctl(FD, TIOCFLUSH, 0);        /* flush any clutter */
        cour_write(FD, "AT C1 E0 H0 Q0 X6 V1\r", 21);
        if (!cour_swallow("\r\nOK\r\n"))
                goto badsynch;
        fflush(stdout);
        cour_write(FD, "AT D", 4);
        for (cp = num; *cp; cp++)
                if (*cp == '=')
                        *cp = ',';
        cour_write(FD, num, strlen(num));
        cour_write(FD, "\r", 1);
        connected = cour_connect();
#ifdef ACULOG
        if (timeout) {
                sprintf(line, "%d second dial timeout",
                        number(value(DIALTIMEOUT)));
                logent(value(HOST), num, "cour", line);
        }
#endif
        if (timeout)
                cour_disconnect();
        return (connected);
}

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

cour_abort()
{
        cour_write(FD, "\r", 1);        /* send anything to abort the call */
        cour_disconnect();
}

static void
sigALRM()
{
        printf("\07timeout waiting for reply\n");
        timeout = 1;
        longjmp(timeoutbuf, 1);
}

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

        f = signal(SIGALRM, sigALRM);
        timeout = 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);
}

struct baud_msg {
        char *msg;
        int baud;
} baud_msg[] = {
        "",             B300,
        " 1200",        B1200,
        " 2400",        B2400,
        0,              0,
};

static int
cour_connect()
{
        char c;
        int nc, nl, n;
        struct sgttyb sb;
        char dialer_buf[64];
        struct baud_msg *bm;
        sig_t f;

        if (cour_swallow("\r\n") == 0)
                return (0);
        f = signal(SIGALRM, sigALRM);
again:
        nc = 0; nl = sizeof(dialer_buf)-1;
        bzero(dialer_buf, sizeof(dialer_buf));
        timeout = 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 (cour_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 = baud_msg ; bm->msg ; bm++)
                                if (strcmp(bm->msg,
                                    dialer_buf+sizeof("CONNECT")-1) == 0) {
                                        if (ioctl(FD, TIOCGETP, &sb) < 0) {
                                                perror("TIOCGETP");
                                                goto error;
                                        }
                                        sb.sg_ispeed = sb.sg_ospeed = bm->baud;
                                        if (ioctl(FD, TIOCSETP, &sb) < 0) {
                                                perror("TIOCSETP");
                                                goto error;
                                        }
                                        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
        }
error1:
        printf("%s\r\n", dialer_buf);
error:
        signal(SIGALRM, f);
        return (0);
}

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

        while (already++ < MAXRETRY) {
                ioctl(FD, TIOCFLUSH, 0);        /* flush any clutter */
                cour_write(FD, "\rAT Z\r", 6);  /* reset modem */
                bzero(buf, sizeof(buf));
                sleep(1);
                ioctl(FD, FIONREAD, &len);
                if (len) {
                        len = read(FD, buf, sizeof(buf));
#ifdef DEBUG
                        buf[len] = '\0';
                        printf("coursync: (\"%s\")\n\r", buf);
#endif
                        if (index(buf, '0') ||
                           (index(buf, 'O') && index(buf, 'K')))
                                return(1);
                }
                /*
                 * If not strapped for DTR control,
                 * try to get command mode.
                 */
                sleep(1);
                cour_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);
        }
        cour_write(FD, "\rAT Z\r", 6);
        return (0);
}

cour_write(fd, cp, n)
int fd;
char *cp;
int n;
{
        struct sgttyb sb;
#ifdef notdef
        if (boolean(value(VERBOSE)))
                write(1, cp, n);
#endif
        ioctl(fd, TIOCGETP, &sb);
        ioctl(fd, TIOCSETP, &sb);
        cour_nap();
        for ( ; n-- ; cp++) {
                write(fd, cp, 1);
                ioctl(fd, TIOCGETP, &sb);
                ioctl(fd, TIOCSETP, &sb);
                cour_nap();
        }
}

#ifdef DEBUG
verbose_read()
{
        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

/*
 * Code stolen from /usr/src/lib/libc/gen/sleep.c
 */
#define mask(s) (1<<((s)-1))
#define setvec(vec, a) \
        vec.sv_handler = a; vec.sv_mask = vec.sv_onstack = 0

static napms = 50; /* Give the courier 50 milliseconds between characters */

static int ringring;

cour_nap()
{

        static void cour_napx();
        int omask;
        struct itimerval itv, oitv;
        register struct itimerval *itp = &itv;
        struct sigvec vec, ovec;

        timerclear(&itp->it_interval);
        timerclear(&itp->it_value);
        if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
                return;
        setvec(ovec, SIG_DFL);
        omask = sigblock(mask(SIGALRM));
        itp->it_value.tv_sec = napms/1000;
        itp->it_value.tv_usec = ((napms%1000)*1000);
        setvec(vec, cour_napx);
        ringring = 0;
        (void) sigvec(SIGALRM, &vec, &ovec);
        (void) setitimer(ITIMER_REAL, itp, (struct itimerval *)0);
        while (!ringring)
                sigpause(omask &~ mask(SIGALRM));
        (void) sigvec(SIGALRM, &ovec, (struct sigvec *)0);
        (void) setitimer(ITIMER_REAL, &oitv, (struct itimerval *)0);
        (void) sigsetmask(omask);
}

static void
cour_napx()
{
        ringring = 1;
}