tip/aculib/ventel.c

	ventel.c revision 8d489c7a815fcac696803219572e95aa01532b0f
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * Routines for calling up on a Ventel Modem
 * Define VENNOECHO if the Ventel is strapped for "no echo".
 */
#include "tip.h"

#define MAXRETRY    5

static int  vensync(int);
static int  gobble(char);
static void echo(char *);
static void sigALRM(void);
static int  timeout = 0;
static sigjmp_buf   timeoutbuf;

void    ven_disconnect(void);

/* ARGSUSED */
int
ven_dialer(char *num, char *acu)
{
    char *cp;
    int connected = 0;
    struct termios buf;
#ifdef ACULOG
    char line[80];
#endif
    /*
     * Get in synch with a couple of carriage returns
     */
    if (!vensync(FD)) {
        (void) printf("can't synchronize with ventel\n");
#ifdef ACULOG
        logent(value(HOST), num, "ventel", "can't synch up");
#endif
        return (0);
    }
    if (boolean(value(VERBOSE)))
        (void) printf("\ndialing...");
    (void) fflush(stdout);
    (void) ioctl(FD, TCGETS, &buf);
    buf.c_cflag |= HUPCL;
    (void) ioctl(FD, TCSETSF, &buf);
#ifdef VENNOECHO
    echo("#k$\r$\n$D$I$A$L$:$ ");
    for (cp = num; *cp; cp++) {
        (void) sleep(1);
        (void) write(FD, cp, 1);
    }
    echo("\r$\n");
#else
    echo("k$\r$\n$D$I$A$L$:$ <");
    for (cp = num; *cp; cp++) {
        char c;

        (void) sleep(1);
        (void) write(FD, cp, 1);
        (void) read(FD, &c, 1);
    }
    echo(">\r$\n");
#endif
    if (gobble('\n'))
        connected = gobble('!');
    (void) ioctl(FD, TCFLSH, TCIOFLUSH);
#ifdef ACULOG
    if (timeout) {
        (void) sprintf(line, "%d second dial timeout",
            number(value(DIALTIMEOUT)));
        logent(value(HOST), num, "ventel", line);
    }
#endif
    if (timeout)
        ven_disconnect();   /* insurance */
    return (connected);
}

void
ven_disconnect(void)
{

    (void) close(FD);
}

void
ven_abort(void)
{

    (void) write(FD, "\03", 1);
    (void) close(FD);
}

static void
echo(char *s)
{
    char c;

    while (c = *s++) {
        switch (c) {
        case '$':
            (void) read(FD, &c, 1);
            s++;
            break;

        case '#':
            c = *s++;
            (void) write(FD, &c, 1);
            break;

        default:
            (void) write(FD, &c, 1);
            (void) read(FD, &c, 1);
        }
    }
}

static void
sigALRM(void)
{

    (void) printf("\07timeout waiting for reply\n");
    timeout = 1;
    siglongjmp(timeoutbuf, 1);
}

static int
gobble(char match)
{
    char c;
    sig_handler_t f;

    f = signal(SIGALRM, (sig_handler_t)sigALRM);
    timeout = 0;
    do {
        if (sigsetjmp(timeoutbuf, 1)) {
            (void) signal(SIGALRM, f);
            return (0);
        }
        (void) alarm(number(value(DIALTIMEOUT)));
        (void) read(FD, &c, 1);
        (void) alarm(0);
        c &= 0177;
#ifdef notdef
        if (boolean(value(VERBOSE)))
            (void) putchar(c);
#endif
    } while (c != '\n' && c != match);
    (void) signal(SIGALRM, SIG_DFL);
    return (c == match);
}

#define min(a, b)   (((a) > (b)) ? (b) : (a))
/*
 * This convoluted piece of code attempts to get
 * the ventel in sync.  If you don't have FIONREAD
 * there are gory ways to simulate this.
 */
static int
vensync(int fd)
{
    int already = 0, nread;
    char buf[60];
    int dtr = TIOCM_DTR;

    /*
     * Toggle DTR to force anyone off that might have left
     * the modem connected, and insure a consistent state
     * to start from.
     *
     * If you don't have the ioctl calls to diddle directly
     * with DTR, you can always try setting the baud rate to 0.
     */
    (void) ioctl(FD, TIOCMBIC, &dtr);
    (void) sleep(2);
    (void) ioctl(FD, TIOCMBIS, &dtr);
    while (already < MAXRETRY) {
        /*
         * After reseting the modem, send it two \r's to
         * autobaud on. Make sure to delay between them
         * so the modem can frame the incoming characters.
         */
        (void) write(fd, "\r", 1);
#ifdef VMUNIX
        {
#include <sys/time.h>
        struct timeval tv = {0, 500000};

        (void) select(0, 0, 0, 0, &tv);
        }
#else
        (void) sleep(1);
#endif
        (void) write(fd, "\r", 1);
        (void) sleep(3);
        if (ioctl(fd, FIONREAD, (caddr_t)&nread) < 0) {
            perror("tip: ioctl");
            continue;
        }
        while (nread > 0) {
            (void) read(fd, buf, min(nread, 60));
            if ((buf[nread - 1] & 0177) == '$')
                return (1);
            nread -= min(nread, 60);
        }
        (void) sleep(1);
        already++;
    }
    return (0);
}