cmd/bnu/ct.c

	ct.c revision f48205be61a214698b763ff550ab9e657525104c
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

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

/*
 *
 *  ct [-h] [-v] [-w n] [-x n] [-s speed] telno ...
 *
 *  dials the given telephone number, waits for the
 *  modem to answer, and initiates a login process.
 *
 *  ct uses several routines from uucp:
 *  - getto(flds) takes a vector of fields needed to make
 *    a connection and returns a file descriptor or -1
 *  - rddev( ... ) takes several arguments and returns lines
 *    from the /etc/uucp/Devices that match the type
 *    (in ct the type will be ACU)
 *  - fdig(string) takes a string that is zero or more
 *    alphabetic characters follow by a number (baud rate)
 *    and returns a pointer to the first digit in the string.
 *  - fn_cklock(dev) takes a device name [/dev/]term/11 and
 *    checks whether the appropriate lock file exists. It returns
 *    FAIL if it does.
 *  - rmlock(pointer) removes the lock file.  In ct pointer is
 *    always CNULL (a null pointer) causing rmlock to remove
 *    all lock files associated with this execution of ct.
 */

#include "uucp.h"
#include "sysfiles.h"
#include <pwd.h>
#include <utmpx.h>

#ifdef DATAKIT
#include <dk.h>
extern int dkminor();
#endif

#define ROOT    0
#define SYS 3
#define TTYGID  (gid_t) 7       /* group id for terminal */
#define TTYMOD  (mode_t) 0622
#define DEV "/dev/"
#define TELNOSIZE   32      /* maximum phone # size is 31 */
#define LEGAL   "0123456789-*#="
#define USAGE   "[-h] [-v] [-w n] [-x n] [-s speed] telno ..."
#define LOG "/var/adm/ctlog"
#define TTYMON  "/usr/lib/saf/ttymon"
#define TRUE    1
#define FALSE   0

static
int _Status;        /* exit status of child */

static
pid_t   _Pid = 0;       /* process id of child */

static
char
    _Tty[sizeof DEV+12] = "",  /* /dev/term/xx for connection device */
    *_Dev[D_MAX + 1],   /* Filled in by rddev and used globally */
    _Devbuf[BUFSIZ];    /* buffer for rddev */

static
char
    *_Num,          /* pointer to a phone number */
    *_Flds[7];      /* Filled in as if finds() in uucp did it */

static
time_t  _Log_on,
    _Log_elpsd;

static
FILE    *_Fdl;

extern int  optind;
extern char *optarg, *fdig();
extern  void cleanup();
extern struct passwd  *getpwuid ();

extern int getto(), rddev();
static int gdev(), logproc(), exists();
static void startat(), stopat(), disconnect(), zero();

/*
 * These two dummy routines are needed because the uucp routines
 * used by ct reference them, but they will never be
 * called when executing from ct
 */

/*VARARGS*/
/*ARGSUSED*/
void
assert (s1, s2, i1, s3, i2)
char *s1, *s2, *s3;
int i1, i2;
{ }     /* for ASSERT in gnamef.c */

/*ARGSUSED*/
void
logent (s1, s2)
char *s1, *s2;
{ }     /* so we can load ulockf() */

jmp_buf Sjbuf;          /* used by uucp routines */

int
main (argc, argv)
int argc;
char   *argv[];
{
    int     c;
    int     found = 0,
        errors = 0,
        first = TRUE;
    int     count,
        logprocflag,    /* is there a login process on the line */
            hangup = 1,     /* hangup by default */
            minutes = 0;    /* number of minutes to wait for dialer */
    int     fdl;
    struct termio   termio;
    typedef void (*save_sig)();
    save_sig    save_hup,
        save_quit,
        save_int;
    extern void setservice(), devreset();
    extern int sysaccess();

    save_hup = signal (SIGHUP, cleanup);
    save_quit = signal (SIGQUIT, cleanup);
    save_int = signal (SIGINT, cleanup);
    (void) signal (SIGTERM, cleanup);
    (void) strcpy (Progname, "ct");

    setservice("cu");
    if ( sysaccess(EACCESS_DEVICES) != 0 ) {
    (void) fprintf(stderr, "ct: can't access Devices file\n");
    cleanup(101);
    }

    /* Set up the _Flds vector as if finds() [from uucico] built it */
    _Flds[F_NAME] = "dummy";        /* never used */
    _Flds[F_TIME] = "Any";      /* never used */
    _Flds[F_TYPE] = "ACU";
    _Flds[F_CLASS] = "1200";        /* default at 1200 */
    _Flds[F_PHONE] = "";            /* filled in by arguments */
    _Flds[F_LOGIN] = "";            /* never used */
    _Flds[6] = NULL;

    while ((c = getopt (argc, argv, "hvw:s:x:")) != EOF) {
    switch (c) {
        case 'h':
        hangup = 0;
        break;

        case 'v':
        Verbose = 1;
        break;

        case 'w':
        minutes = atoi (optarg);
        if (minutes < 1) {
            (void) fprintf(stderr,
            "\tusage: %s %s\n", Progname, USAGE);
            (void) fprintf(stderr, "(-w %s) Wait time must be > 0\n",
            optarg);
            cleanup(101);
        }
        break;

        case 's':
        _Flds[F_CLASS] = optarg;
        break;

        case 'x':
        Debug = atoi(optarg);
        if (Debug < 0 || Debug > 9) {
            (void) fprintf(stderr,
            "\tusage: %s %s\n", Progname, USAGE);
            (void) fprintf(stderr, "(-x %s) value must be 0-9\n",
            optarg);
            cleanup(101);
        }
        break;

        case '?':
        (void) fprintf(stderr, "\tusage: %s %s\n", Progname, USAGE);
        cleanup(101);
        /* NOTREACHED */
    }
    }

    if (optind == argc) {
    (void) fprintf(stderr, "\tusage: %s %s\n", Progname, USAGE);
    (void) fprintf(stderr, "No phone numbers specified!\n");
    cleanup(101);
    }

    /* check for valid phone number(s) */
    for (count = argc - 1; count >= optind; --count) {
    _Num = argv[count];
    if (strlen(_Num) >= (size_t)(TELNOSIZE - 1)) {
        (void) fprintf(stderr, "ct: phone number too long -- %s\n", _Num);
        ++errors;
    }
    if ((int)strspn(_Num, LEGAL) < (int)strlen(_Num)) {
        (void) fprintf(stderr, "ct: bad phone number -- %s\n", _Num);
        ++errors;
    }
    }
    if (errors)
    cleanup(101);

    /************************************************************/
    /*      Begin Loop:  Find an available Dialer       */
    /************************************************************/
    for (count = 0;; count++) { /* count will be wait time after first
                 * time through the loop.
                 * break will be used exit loop.
                 */
    if ( (found = gdev (_Flds)) > 0) {  /* found a dialer */
        (void) fprintf(stdout, "Allocated dialer at %s baud\n",
        _Flds[F_CLASS]);
        break;
    }
    else if (found == 0) {  /* no dialers of that on system */
        (void) fprintf(stdout, "No %s dialers on this system\n",
        fdig(_Flds[F_CLASS]) );
            cleanup(101);
    }

    if (!first) { /* not the first time in loop */
        VERBOSE("%s busy", (found == -1) ? "Dialer is" : "Dialers are");
        VERBOSE(" (%d minute(s))\n", count);
        if (count < minutes) {
            sleep(60);
            continue;
        }
        /* This is the end of the loop - no time left */
        break;
    }

    /**************************************************************/
    /* First time through loop - get wait minutes if no -w option */
    /**************************************************************/
    first = FALSE;
    (void) fprintf(stdout, "The (%d) %s dialer%s busy\n", -found,
        _Flds[F_CLASS], (found == -1 ? " is" : "s are"));
    if (minutes) {  /* -w already set wait minutes */
        (void) fprintf(stdout, "Waiting for %d minute%s\n", minutes,
        (minutes > 1 ? "s" : "") );
        sleep(60);
        continue;
    }

    if (!isatty(0) )  {  /* not a terminal - get out */
        cleanup(101);
    }

    /* Ask user if she/he wants to wait */
    (void) fputs("Do you want to wait for dialer? (y for yes): ", stdout);
    if ((c = getchar ()) == EOF || tolower (c) != 'y')
        cleanup(101);
    while ( (c = getchar()) != EOF && c != '\n')
        ;

    (void) fputs ("Time, in minutes? ", stdout);
    (void) scanf ("%d", &minutes);
    while ( (c = getchar()) != EOF && c != '\n')
        ;

    if (minutes <= 0)
        cleanup(101);

    (void) fputs ("Waiting for dialer\n", stdout);
    sleep(60);
    continue;

    }
    /************************************************************/
    /*      End Loop:  Find an available Dialer     */
    /************************************************************/

    /* check why loop terminated */
    if (found < 0) {    /* no dialer found - get out */
        (void) fputs("*** TIMEOUT ***\n", stdout);
        cleanup(101);
    }

    (void) signal(SIGHUP, SIG_IGN);
    /* found a dialer. now try to call */
    if (!isatty(0))
        hangup = 0;

    if (hangup) {  /* -h option not specified */
    do {
            (void) fputs ("Confirm hang-up? (y/n): ", stdout);
        switch (c=tolower(getchar())) {
       case EOF:
       case 'n':
            cleanup(101);
            break;
       case 'y':
            break;
        default:
            while ( c != EOF && c != '\n' )
            c=getchar();
            break;
        }
    } while (c != 'y');

    /* close stderr if it is not redirected */
        if ( isatty(2) ) {
            Verbose = 0;
        Debug = 0;
            (void) close (2);
    }

    (void) ioctl (0, TCGETA, &termio);
        termio.c_cflag = 0; /* speed to zero for hangup */
        (void) ioctl (0, TCSETAW, &termio);  /* hang up terminal */
        (void) sleep (5);
    }
    (void) close(0);
    (void) close(1);

    /* Try each phone number until a connection is made, or non work */
    for (count = optind; count < argc; count++) {
    /* call getto routine to make connection */
    _Flds[F_PHONE] = argv[count];
    rmlock(CNULL);  /* remove temporary lock set by gdev */
    devreset();
    fdl = getto(_Flds);
    if (fdl >= 0) {
        /*
         * If there is a login process on the line, get rid
         * of the lock file quickly so that when the process
         * reads the first character, the lock file will be gone
         * indicating that the process should handle the data.
         */
        if ( (logprocflag = logproc(Dc)) ) /* really an assignment! */
        rmlock(CNULL);

        _Fdl = fdopen(fdl, "r+");
        (void) sprintf(_Tty, "%s%s", DEV, Dc);
        /* NOTE:  Dc is set in the caller routines */
        break;
    }
    }

    /* check why the loop ended (connected or no more numbers to try) */
    if (count == argc)
    cleanup(101);

    /****** Successfully made connection ******/
    VERBOSE("Connected\n%s", "");

#ifdef  DATAKIT
    if (!strcmp(_Dev[D_CALLER], "DK")) {
        strcpy(_Tty, dtnamer(dkminor(fdl)));
        strcpy(Dc, (strrchr(_Tty, '/')+1));
        if ((_Fdl = fopen(_Tty, "r+")) == NULL) {
            (void) fprintf(stderr, "ct: Cannot open %s, errno %d\n",
                _Tty, errno);
            cleanup(101);
        }
    }
#endif

    /* ignore some signals if they were ignored upon invocation of ct */
    /* or else, have them go to graceful disconnect */
    if (save_hup == SIG_IGN)
    (void) signal (SIGHUP, SIG_IGN);
    else
    (void) signal (SIGHUP, disconnect);

    if (save_quit == SIG_IGN)
    (void) signal (SIGQUIT, SIG_IGN);
    else
    (void) signal (SIGQUIT, disconnect);

    if (save_int == SIG_IGN)
    (void) signal (SIGINT, SIG_IGN);
    else
    (void) signal (SIGINT, disconnect);

    (void) signal (SIGTERM, disconnect);
    (void) signal (SIGALRM, disconnect);

    (void) sleep (2);       /* time for phone line/modem to settle */

    _Log_on = time ((time_t *) 0);

    /*
     * if there is a login process on this line,
     * tell the user to hit a carriage return to make
     * the waiting process get past the inital read,
     * Then exit.
     */
    if (logprocflag) {  /* there is a login process on the line */
    (void) fputs("Hit carriage return ", _Fdl);
    (void) fclose(_Fdl);
    CDEBUG(4, "there is a login process; exit\n%s", "");
    exit(0);
    }

    CDEBUG(4, "start login process (%s ", TTYMON);
    CDEBUG(4, "-g -h -t 60 -l %s)\n", fdig(_Flds[F_CLASS]));
    for (;;) {
    pid_t w_ret;
    switch(_Pid = fork()) {
    case -1:    /* fork failed */
        if ((!hangup || Verbose))
        (void) fputs ("ct: can't fork for login process\n", stderr);
        cleanup(101);
        /*NOTREACHED*/

    case 0:     /* child process */
        startat ();
        (void) close(2);
        /* ttymon will use open fd 0 for connection */
        if ( fdl != 0 ) {
        (void) close(0);
        dup(fdl);
        }
        (void) signal(SIGHUP, SIG_DFL);  /* so child will exit on hangup */
        (void) execl(TTYMON, "ttymon", "-g", "-h", "-t", "60",
            "-l", fdig(_Flds[F_CLASS]), (char *) 0);
        /* exec failed */
        cleanup(101);
        /*NOTREACHED*/

    default:    /* parent process */
        break;
    }

    /* Parent process */

    while ((w_ret = wait(&_Status)) != _Pid)
        if (w_ret == -1 && errno != EINTR) {
        VERBOSE("ct: wait failed errno=%d\n", errno);
        cleanup(101);
        }
    if ((_Status & 0xff00) < 0) {
        if (!hangup)
        VERBOSE("ct: can't exec login process\n%s", "");
        cleanup(101);
    }

    stopat(_Flds[F_PHONE]);

        rewind (_Fdl);  /* flush line */
        (void) fputs ("\nReconnect? ", _Fdl);

        rewind (_Fdl);
        (void) alarm (20);
        c = getc (_Fdl);

        if (c == EOF || tolower (c) == 'n')
        disconnect (0); /* normal disconnect */
        while ( (c = getc(_Fdl)) != EOF && c != '\n')
            ;
        (void) alarm (0);
    }
}

static void
disconnect (code)
{
    struct termio   termio;

    (void) alarm(0);
    (void) signal (SIGALRM, SIG_IGN);
    (void) signal (SIGINT, SIG_IGN);
    (void) signal (SIGTERM, SIG_IGN);

    _Log_elpsd = time ((time_t *) 0) - _Log_on;

    (void) ioctl (fileno(_Fdl), TCGETA, &termio);
    termio.c_cflag = 0;             /* speed to zero for hangup */
    (void) ioctl (fileno(_Fdl), TCSETAW, &termio);  /* hang up terminal */
    (void) fclose (_Fdl);

    DEBUG(5, "Disconnect(%d)\n", code);
    VERBOSE("Disconnected\n%s", "");

    /* For normal disconnect or timeout on "Reconnect?" message,
       we already cleaned up above */

    if ((code != 0) && (code != SIGALRM))
    stopat(_Flds[F_PHONE]);

    cleanup(code);
}

/*
 * clean and exit with "code" status
 */
void
cleanup (code)
int    code;
{
    CDEBUG(5, "cleanup(%d)\n", code);
    rmlock (CNULL);
    if (*_Tty != '\0') {
    CDEBUG(5, "chmod/chown %s\n", _Tty);
    if (chown(_Tty , UUCPUID, TTYGID) < 0 ) {
        CDEBUG(5, "Can't chown to uid=%u, ", UUCPUID);
        CDEBUG(5, "gid=%u\n", TTYGID);
    }
    if (chmod(_Tty , TTYMOD) < 0) {
        CDEBUG(5, "Can't chmod to %lo\n", (unsigned long) TTYMOD);
    }
    }
    if (_Pid) { /* kill the child process */
    (void) signal(SIGHUP, SIG_IGN);
    (void) signal(SIGQUIT, SIG_IGN);
    (void) kill (_Pid, SIGKILL);
    }
    exit (code);
}

/*  gdev()
 * Find an available line with a dialer on it.
 * Set a temporary lock file for the line.
 * Return:
 *  >0 - got a dialer
 *  <0 - failed - return the number of possible dialers
 *  0 - not dialers of requested class on the system.
 */

static int
gdev (flds)
char   *flds[];
{
    int count = 0;
    extern void devreset();

    devreset();
    while (rddev ("ACU", _Dev, _Devbuf, D_MAX) != FAIL) {
    /* check caller type */
    if (!EQUALS (flds[F_TYPE] /* "ACU" */, _Dev[D_TYPE]))
        continue;
    /* check class, check (and possibly set) speed */
    if (!EQUALS (flds[F_CLASS] /* speed */, _Dev[D_CLASS]))
        continue;
    count++;

    if (fn_cklock(_Dev[D_LINE]) == FAIL)
        continue;

    /* found available dialer and set temporary lock */
    return (count);

    }
    return (- count);
}

/*
 * Check if there is a login process active on this line.
 * Return:
 *  0 - there is no login process on this line
 *  1 - found a login process on this line
 */

static int
logproc(line)
char *line;
{
    struct utmpx   *u;

    while ((u = getutxent()) != NULL) {
    if (u->ut_type == LOGIN_PROCESS
        && EQUALS(u->ut_line, line)
        && EQUALS(u->ut_user, "LOGIN") ) {
        CDEBUG(7, "ut_line %s, ", u->ut_line);
        CDEBUG(7, "ut_user %s, ", u->ut_user);
        CDEBUG(7, "ut_id %.4s, ", u->ut_id);
        CDEBUG(7, "ut_pid %d\n", u->ut_pid);

        /* see if the process is still active */
        if (kill(u->ut_pid, 0) == 0 || errno == EPERM) {
            CDEBUG(4, "process still active\n%s", "");
            return(1);
        }
    }
    }
    return(0);
}

/*
 * Create an entry in utmpx file if one does not already exist.
 */
static void
startat ()
{
    struct utmpx utmpxbuf, *u;
    int fd;

/*  Set up the prototype for the utmpx structure we want to write.  */

    u = &utmpxbuf;
    zero (&u -> ut_user[0], sizeof (u -> ut_user));
    zero (&u -> ut_line[0], sizeof (u -> ut_line));

/*  Fill in the various fields of the utmpx structure.      */

    u -> ut_id[0] = 'c';
    u -> ut_id[1] = 't';
    u -> ut_id[2] = _Tty[strlen(_Tty)-2];
    u -> ut_id[3] = _Tty[strlen(_Tty)-1];
    u -> ut_pid = getpid ();

    u -> ut_exit.e_termination = 0;
    u -> ut_exit.e_exit = 0;
    u -> ut_type = INIT_PROCESS;
    time (&u -> ut_xtime);
    setutxent ();       /* Start at beginning of utmpx file. */

/*  For INIT_PROCESSes put in the name of the program in the    */
/*  "ut_user" field.                        */

    strncpy (&u -> ut_user[0], "ttymon", sizeof (u -> ut_user));
    strncpy (&u -> ut_line[0], Dc, sizeof (u -> ut_line));

/*  Write out the updated entry to utmpx file.          */
    pututxline (u);

/*  Now attempt to add to the end of the wtmpx file.  Do not create */
/*  if it doesn't already exist. Do not overwrite any info already  */
/*  in file.                            */

    if ((fd = open(WTMPX_FILE, O_WRONLY | O_APPEND)) != -1) {
    (void) write(fd, u, sizeof(*u));
    (void) close(fd);
    }
    endutxent ();
    return;
}

/*
 * Change utmpx file entry to "dead".
 * Make entry in ct log.
 */

static void
stopat (num)
char   *num;
{
    struct utmpx utmpxbuf, *u;
    int fd;
    FILE * fp;

/*  Set up the prototype for the utmpx structure we want to write.  */

    setutxent();
    u = &utmpxbuf;
    zero (&u -> ut_user[0], sizeof (u -> ut_user));
    zero (&u -> ut_line[0], sizeof (u -> ut_line));

/*  Fill in the various fields of the utmpx structure.      */

    u -> ut_id[0] = 'c';
    u -> ut_id[1] = 't';
    u -> ut_id[2] = _Tty[strlen(_Tty)-2];
    u -> ut_id[3] = _Tty[strlen(_Tty)-1];
    u -> ut_pid = (pid_t) _Pid;
    u -> ut_type = USER_PROCESS;

/*  Find the old entry in the utmpx file with the user name and */
/*  copy it back.                           */

    if (u = getutxid (u)) {
    utmpxbuf = *u;
    u = &utmpxbuf;
    }

    u -> ut_exit.e_termination = _Status & 0xff;
    u -> ut_exit.e_exit = (_Status >> 8) & 0xff;
    u -> ut_type = DEAD_PROCESS;
    time (&u -> ut_xtime);

/*  Write out the updated entry to utmpx file.          */

    pututxline (u);

/*  Now attempt to add to the end of the wtmpx file.  Do not create */
/*  if it doesn't already exist. Do not overwrite any info already  */
/*  in file.                            */

    if ((fd = open(WTMPX_FILE, O_WRONLY | O_APPEND)) != -1) {
    (void) write(fd, u, sizeof(*u));
    (void) close(fd);
    }
    endutxent ();

/*  Do the log accounting                   */

    if (exists (LOG) && (fp = fopen (LOG, "a")) != NULL) {
    char   *aptr;
    int     hrs,
            mins,
            secs;

    /* ignore user set TZ for logfile purposes */
    if ( (aptr = getenv ("TZ")) != NULL )
        *aptr = '\0';

    (aptr = ctime (&_Log_on))[16] = '\0';
    hrs = _Log_elpsd / 3600;
    mins = (_Log_elpsd %= 3600) / 60;
    secs = _Log_elpsd % 60;
    (void) fprintf(fp, "%-8s ", getpwuid (getuid ()) -> pw_name);
    (void) fprintf(fp, "(%4s)  %s ", fdig(_Flds[F_CLASS]), aptr);
    if (hrs)
        (void) fprintf(fp, "%2d:%.2d", hrs, mins);
    else
        (void) fprintf(fp, "   %2d", mins);
    (void) fprintf(fp, ":%.2d  %s\n", secs, num);
    (void) fclose (fp);
    }
    return;
}

static int
exists (file)
char   *file;
{
    struct stat statb;

    if (stat (file, &statb) == -1 && errno == ENOENT)
    return (0);
    return (1);
}

static void
zero (adr, size)
char  *adr;
int    size;
{
    while (size--)
    *adr++ = '\0';
    return;
}