/*
 * 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   */
/*
 * Copyright (c) 2016 by Delphix. All rights reserved.
 */

/*
 *
 *      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

int     Dologin = 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 they want 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(int 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;
}