Internet Info 1994 March/Internet Info CD-ROM (Walnut Creek) (March 1994).iso/networking/terms/tip/libacu/biz31.c

C/C++ Source or Header | 1989-05-13 | 4.4 KB | 233 lines

/*
 * Copyright (c) 1983 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)biz31.c    5.2 (Berkeley) 9/13/88";
#endif /* not lint */

#include "tip.h"

#define MAXRETRY    3        /* sync up retry count */
#define DISCONNECT_CMD    "\21\25\11\24"    /* disconnection string */

static    int sigALRM();
static    int timeout = 0;
static    jmp_buf timeoutbuf;

/*
 * Dial up on a BIZCOMP Model 1031 with either
 *     tone dialing (mod = "f")
 *    pulse dialing (mod = "w")
 */
static int
biz_dialer(num, mod)
    char *num, *mod;
{
    register int connected = 0;

    if (!bizsync(FD)) {
        logent(value(HOST), "", "biz", "out of sync");
        printf("bizcomp out of sync\n");
        delock(uucplock);
        exit(0);
    }
    if (boolean(value(VERBOSE)))
        printf("\nstarting call...");
    echo("#\rk$\r$\n");            /* disable auto-answer */
    echo("$>$.$ #\r");            /* tone/pulse dialing */
    echo(mod);
    echo("$\r$\n");
    echo("$>$.$ #\re$ ");            /* disconnection sequence */
    echo(DISCONNECT_CMD);
    echo("\r$\n$\r$\n");
    echo("$>$.$ #\rr$ ");            /* repeat dial */
    echo(num);
    echo("\r$\n");
    if (boolean(value(VERBOSE)))
        printf("ringing...");
    /*
     * The reply from the BIZCOMP should be:
     *    `^G NO CONNECTION\r\n^G\r\n'    failure
     *    ` CONNECTION\r\n^G'        success
     */
    connected = detect(" ");
#ifdef ACULOG
    if (timeout) {
        char line[80];

        sprintf(line, "%d second dial timeout",
            number(value(DIALTIMEOUT)));
        logent(value(HOST), num, "biz", line);
    }
#endif
    if (!connected)
        flush(" NO CONNECTION\r\n\07\r\n");
    else
        flush("CONNECTION\r\n\07");
    if (timeout)
        biz31_disconnect();    /* insurance */
    return (connected);
}

biz31w_dialer(num, acu)
    char *num, *acu;
{

    return (biz_dialer(num, "w"));
}

biz31f_dialer(num, acu)
    char *num, *acu;
{

    return (biz_dialer(num, "f"));
}

biz31_disconnect()
{

    write(FD, DISCONNECT_CMD, 4);
    sleep(2);
    ioctl(FD, TIOCFLUSH);
}

biz31_abort()
{

    write(FD, "\33", 1);
}

static int
echo(s)
    register char *s;
{
    char c;

    while (c = *s++) switch (c) {

    case '$':
        read(FD, &c, 1);
        s++;
        break;

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

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

static int
sigALRM()
{

    timeout = 1;
    longjmp(timeoutbuf, 1);
}

static int
detect(s)
    register char *s;
{
    char c;
    sigfunc_t (*f)();

    f = signal(SIGALRM, sigALRM);
    timeout = 0;
    while (*s) {
        if (setjmp(timeoutbuf)) {
            printf("\07timeout waiting for reply\n");
            biz31_abort();
            break;
        }
        alarm(number(value(DIALTIMEOUT)));
        read(FD, &c, 1);
        alarm(0);
        if (c != *s++)
            break;
    }
    signal(SIGALRM, f);
    return (timeout == 0);
}

static int
flush(s)
    register char *s;
{
    char c;
    sigfunc_t (*f)();

    f = signal(SIGALRM, sigALRM);
    while (*s++) {
        if (setjmp(timeoutbuf))
            break;
        alarm(10);
        read(FD, &c, 1);
        alarm(0);
    }
    signal(SIGALRM, f);
    timeout = 0;            /* guard against disconnection */
}

/*
 * This convoluted piece of code attempts to get
 *  the bizcomp in sync.  If you don't have the capacity or nread
 *  call there are gory ways to simulate this.
 */
static int
bizsync(fd)
{
#ifdef FIOCAPACITY
    struct capacity b;
#    define chars(b)    ((b).cp_nbytes)
#    define IOCTL    FIOCAPACITY
#endif
#ifdef FIONREAD
    long b;
#    define chars(b)    (b)
#    define IOCTL    FIONREAD
#endif
    register int already = 0;
    char buf[10];

retry:
    if (ioctl(fd, IOCTL, (caddr_t)&b) >= 0 && chars(b) > 0)
        ioctl(fd, TIOCFLUSH);
    write(fd, "\rp>\r", 4);
    sleep(1);
    if (ioctl(fd, IOCTL, (caddr_t)&b) >= 0) {
        if (chars(b) != 10) {
    nono:
            if (already > MAXRETRY)
                return (0);
            write(fd, DISCONNECT_CMD, 4);
            sleep(2);
            already++;
            goto retry;
        } else {
            read(fd, buf, 10);
            if (strncmp(buf, "p >\r\n\r\n>", 8))
                goto nono;
        }
    }
    return (1);
}