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sys_term.c

/*
 * Copyright (c) 1989, 1993
 *    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.
 */

#include "telnetd.h"

RCSID("$Id: sys_term.c,v 1.104 2001/09/17 02:09:04 assar Exp $");

#if defined(_CRAY) || (defined(__hpux) && !defined(HAVE_UTMPX_H))
# define PARENT_DOES_UTMP
#endif

#ifdef HAVE_UTMP_H
#include <utmp.h>
#endif

#ifdef HAVE_UTMPX_H
#include <utmpx.h>
#endif

#ifdef HAVE_UTMPX_H
struct      utmpx wtmp;
#elif defined(HAVE_UTMP_H)
struct      utmp wtmp;
#endif /* HAVE_UTMPX_H */

#ifdef HAVE_STRUCT_UTMP_UT_HOST
int   utmp_len = sizeof(wtmp.ut_host);
#else
int   utmp_len = MaxHostNameLen;
#endif

#ifndef UTMP_FILE
#ifdef _PATH_UTMP
#define UTMP_FILE _PATH_UTMP
#else
#define UTMP_FILE "/etc/utmp"
#endif
#endif

#if !defined(WTMP_FILE) && defined(_PATH_WTMP)
#define WTMP_FILE _PATH_WTMP
#endif

#ifndef PARENT_DOES_UTMP
#ifdef WTMP_FILE
char  wtmpf[] = WTMP_FILE;
#else
char  wtmpf[]     = "/usr/adm/wtmp";
#endif
char  utmpf[] = UTMP_FILE;
#else /* PARENT_DOES_UTMP */
#ifdef WTMP_FILE
char  wtmpf[] = WTMP_FILE;
#else
char  wtmpf[]     = "/etc/wtmp";
#endif
#endif /* PARENT_DOES_UTMP */

#ifdef HAVE_TMPDIR_H
#include <tmpdir.h>
#endif      /* CRAY */

#ifdef      STREAMSPTY

#ifdef HAVE_SAC_H
#include <sac.h>
#endif

#ifdef HAVE_SYS_STROPTS_H
#include <sys/stropts.h>
#endif

#endif /* STREAMSPTY */

#undef NOERROR

#ifdef      HAVE_SYS_STREAM_H
#ifdef  HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef __hpux
#undef SE
#endif
#include <sys/stream.h>
#endif
#if !(defined(__sgi) || defined(__linux) || defined(_AIX)) && defined(HAVE_SYS_TTY)
#include <sys/tty.h>
#endif
#ifdef      t_erase
#undef      t_erase
#undef      t_kill
#undef      t_intrc
#undef      t_quitc
#undef      t_startc
#undef      t_stopc
#undef      t_eofc
#undef      t_brkc
#undef      t_suspc
#undef      t_dsuspc
#undef      t_rprntc
#undef      t_flushc
#undef      t_werasc
#undef      t_lnextc
#endif

#ifdef HAVE_TERMIOS_H
#include <termios.h>
#else
#ifdef HAVE_TERMIO_H
#include <termio.h>
#endif
#endif

#ifdef HAVE_UTIL_H
#include <util.h>
#endif
#ifdef HAVE_LIBUTIL_H
#include <libutil.h>
#endif

# ifndef    TCSANOW
#  ifdef TCSETS
#   define  TCSANOW           TCSETS
#   define  TCSADRAIN   TCSETSW
#   define  tcgetattr(f, t)   ioctl(f, TCGETS, (char *)t)
#  else
#   ifdef TCSETA
#    define TCSANOW           TCSETA
#    define TCSADRAIN   TCSETAW
#    define tcgetattr(f, t)   ioctl(f, TCGETA, (char *)t)
#   else
#    define TCSANOW           TIOCSETA
#    define TCSADRAIN   TIOCSETAW
#    define tcgetattr(f, t)   ioctl(f, TIOCGETA, (char *)t)
#   endif
#  endif
#  define   tcsetattr(f, a, t)      ioctl(f, a, t)
#  define   cfsetospeed(tp, val)    (tp)->c_cflag &= ~CBAUD; \
(tp)->c_cflag |= (val)
#  define   cfgetospeed(tp)         ((tp)->c_cflag & CBAUD)
#  ifdef CIBAUD
#   define  cfsetispeed(tp, val)    (tp)->c_cflag &= ~CIBAUD; \
     (tp)->c_cflag |= ((val)<<IBSHIFT)
#   define  cfgetispeed(tp)         (((tp)->c_cflag & CIBAUD)>>IBSHIFT)
#  else
#   define  cfsetispeed(tp, val)    (tp)->c_cflag &= ~CBAUD; \
     (tp)->c_cflag |= (val)
#   define  cfgetispeed(tp)         ((tp)->c_cflag & CBAUD)
#  endif
# endif /* TCSANOW */
     struct termios termbuf, termbuf2;    /* pty control structure */
# ifdef  STREAMSPTY
     static int ttyfd = -1;
     int really_stream = 0;
# endif

     const char *new_login = _PATH_LOGIN;

/*
 * init_termbuf()
 * copy_termbuf(cp)
 * set_termbuf()
 *
 * These three routines are used to get and set the "termbuf" structure
 * to and from the kernel.  init_termbuf() gets the current settings.
 * copy_termbuf() hands in a new "termbuf" to write to the kernel, and
 * set_termbuf() writes the structure into the kernel.
 */

     void
     init_termbuf(void)
{
# ifdef  STREAMSPTY
    if (really_stream)
      tcgetattr(ttyfd, &termbuf);
    else
# endif
      tcgetattr(ourpty, &termbuf);
    termbuf2 = termbuf;
}

void
set_termbuf(void)
{
    /*
     * Only make the necessary changes.
       */
    if (memcmp(&termbuf, &termbuf2, sizeof(termbuf)))
# ifdef  STREAMSPTY
      if (really_stream)
          tcsetattr(ttyfd, TCSANOW, &termbuf);
      else
# endif
          tcsetattr(ourpty, TCSANOW, &termbuf);
}


/*
 * spcset(func, valp, valpp)
 *
 * This function takes various special characters (func), and
 * sets *valp to the current value of that character, and
 * *valpp to point to where in the "termbuf" structure that
 * value is kept.
 *
 * It returns the SLC_ level of support for this function.
 */


int
spcset(int func, cc_t *valp, cc_t **valpp)
{

#define     setval(a, b)      *valp = termbuf.c_cc[a]; \
    *valpp = &termbuf.c_cc[a]; \
                           return(b);
#define     defval(a) *valp = ((cc_t)a); *valpp = (cc_t *)0; return(SLC_DEFAULT);

    switch(func) {
    case SLC_EOF:
      setval(VEOF, SLC_VARIABLE);
    case SLC_EC:
      setval(VERASE, SLC_VARIABLE);
    case SLC_EL:
      setval(VKILL, SLC_VARIABLE);
    case SLC_IP:
      setval(VINTR, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
    case SLC_ABORT:
      setval(VQUIT, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
    case SLC_XON:
#ifdef      VSTART
      setval(VSTART, SLC_VARIABLE);
#else
      defval(0x13);
#endif
    case SLC_XOFF:
#ifdef      VSTOP
      setval(VSTOP, SLC_VARIABLE);
#else
      defval(0x11);
#endif
    case SLC_EW:
#ifdef      VWERASE
      setval(VWERASE, SLC_VARIABLE);
#else
      defval(0);
#endif
    case SLC_RP:
#ifdef      VREPRINT
      setval(VREPRINT, SLC_VARIABLE);
#else
      defval(0);
#endif
    case SLC_LNEXT:
#ifdef      VLNEXT
      setval(VLNEXT, SLC_VARIABLE);
#else
      defval(0);
#endif
    case SLC_AO:
#if   !defined(VDISCARD) && defined(VFLUSHO)
# define VDISCARD VFLUSHO
#endif
#ifdef      VDISCARD
      setval(VDISCARD, SLC_VARIABLE|SLC_FLUSHOUT);
#else
      defval(0);
#endif
    case SLC_SUSP:
#ifdef      VSUSP
      setval(VSUSP, SLC_VARIABLE|SLC_FLUSHIN);
#else
      defval(0);
#endif
#ifdef      VEOL
    case SLC_FORW1:
      setval(VEOL, SLC_VARIABLE);
#endif
#ifdef      VEOL2
    case SLC_FORW2:
      setval(VEOL2, SLC_VARIABLE);
#endif
    case SLC_AYT:
#ifdef      VSTATUS
      setval(VSTATUS, SLC_VARIABLE);
#else
      defval(0);
#endif

    case SLC_BRK:
    case SLC_SYNCH:
    case SLC_EOR:
      defval(0);

    default:
      *valp = 0;
      *valpp = 0;
      return(SLC_NOSUPPORT);
    }
}

#ifdef _CRAY
/*
 * getnpty()
 *
 * Return the number of pty's configured into the system.
 */
int
getnpty()
{
#ifdef _SC_CRAY_NPTY
    int numptys;

    if ((numptys = sysconf(_SC_CRAY_NPTY)) != -1)
      return numptys;
    else
#endif /* _SC_CRAY_NPTY */
      return 128;
}
#endif /* CRAY */

/*
 * getpty()
 *
 * Allocate a pty.  As a side effect, the external character
 * array "line" contains the name of the slave side.
 *
 * Returns the file descriptor of the opened pty.
 */

static char Xline[] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
char *line = Xline;

#ifdef      _CRAY
char myline[] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
#endif      /* CRAY */

#if !defined(HAVE_PTSNAME) && defined(STREAMSPTY)
static char *ptsname(int fd)
{
#ifdef HAVE_TTYNAME
    return ttyname(fd);
#else
    return NULL;
#endif
}
#endif

int getpty(int *ptynum)
{
#ifdef __osf__ /* XXX */
    int master;
    int slave;
    if(openpty(&master, &slave, line, 0, 0) == 0){
      close(slave);
      return master;
    }
    return -1;
#else
#ifdef HAVE__GETPTY
    int master, slave;
    char *p;
    p = _getpty(&master, O_RDWR, 0600, 1);
    if(p == NULL)
      return -1;
    strlcpy(line, p, sizeof(Xline));
    return master;
#else

    int p;
    char *cp, *p1, *p2;
    int i;
#if SunOS == 40
    int dummy;
#endif
#if __linux
    int master;
    int slave;
    if(openpty(&master, &slave, line, 0, 0) == 0){
      close(slave);
      return master;
    }
#else
#ifdef      STREAMSPTY
    char *clone[] = { "/dev/ptc", "/dev/ptmx", "/dev/ptm", 
                  "/dev/ptym/clone", 0 };

    char **q;
    for(q=clone; *q; q++){
      p=open(*q, O_RDWR);
      if(p >= 0){
#ifdef HAVE_GRANTPT
          grantpt(p);
#endif
#ifdef HAVE_UNLOCKPT
          unlockpt(p);
#endif
          strlcpy(line, ptsname(p), sizeof(Xline));
          really_stream = 1;
          return p;
      }
    }
#endif /* STREAMSPTY */
#ifndef _CRAY

#ifndef     __hpux
    snprintf(line, sizeof(Xline), "/dev/ptyXX");
    p1 = &line[8];
    p2 = &line[9];
#else
    snprintf(line, sizeof(Xline), "/dev/ptym/ptyXX");
    p1 = &line[13];
    p2 = &line[14];
#endif

      
    for (cp = "pqrstuvwxyzPQRST"; *cp; cp++) {
      struct stat stb;

      *p1 = *cp;
      *p2 = '0';
      /*
       * This stat() check is just to keep us from
       * looping through all 256 combinations if there
       * aren't that many ptys available.
       */
      if (stat(line, &stb) < 0)
          break;
      for (i = 0; i < 16; i++) {
          *p2 = "0123456789abcdef"[i];
          p = open(line, O_RDWR);
          if (p > 0) {
#ifndef     __hpux
            line[5] = 't';
#else
            for (p1 = &line[8]; *p1; p1++)
                *p1 = *(p1+1);
            line[9] = 't';
#endif
            chown(line, 0, 0);
            chmod(line, 0600);
#if SunOS == 40
            if (ioctl(p, TIOCGPGRP, &dummy) == 0
                || errno != EIO) {
                chmod(line, 0666);
                close(p);
                line[5] = 'p';
            } else
#endif /* SunOS == 40 */
                return(p);
          }
      }
    }
#else /* CRAY */
    extern lowpty, highpty;
    struct stat sb;

    for (*ptynum = lowpty; *ptynum <= highpty; (*ptynum)++) {
      snprintf(myline, sizeof(myline), "/dev/pty/%03d", *ptynum);
      p = open(myline, 2);
      if (p < 0)
          continue;
      snprintf(line, sizeof(Xline), "/dev/ttyp%03d", *ptynum);
      /*
       * Here are some shenanigans to make sure that there
       * are no listeners lurking on the line.
       */
      if(stat(line, &sb) < 0) {
          close(p);
          continue;
      }
      if(sb.st_uid || sb.st_gid || sb.st_mode != 0600) {
          chown(line, 0, 0);
          chmod(line, 0600);
          close(p);
          p = open(myline, 2);
          if (p < 0)
            continue;
      }
      /*
       * Now it should be safe...check for accessability.
       */
      if (access(line, 6) == 0)
          return(p);
      else {
          /* no tty side to pty so skip it */
          close(p);
      }
    }
#endif      /* CRAY */
#endif      /* STREAMSPTY */
#endif /* OPENPTY */
    return(-1);
#endif
}


int
tty_isecho(void)
{
    return (termbuf.c_lflag & ECHO);
}

int
tty_flowmode(void)
{
    return((termbuf.c_iflag & IXON) ? 1 : 0);
}

int
tty_restartany(void)
{
    return((termbuf.c_iflag & IXANY) ? 1 : 0);
}

void
tty_setecho(int on)
{
    if (on)
      termbuf.c_lflag |= ECHO;
    else
      termbuf.c_lflag &= ~ECHO;
}

int
tty_israw(void)
{
    return(!(termbuf.c_lflag & ICANON));
}

void
tty_binaryin(int on)
{
    if (on) {
      termbuf.c_iflag &= ~ISTRIP;
    } else {
      termbuf.c_iflag |= ISTRIP;
    }
}

void
tty_binaryout(int on)
{
    if (on) {
      termbuf.c_cflag &= ~(CSIZE|PARENB);
      termbuf.c_cflag |= CS8;
      termbuf.c_oflag &= ~OPOST;
    } else {
      termbuf.c_cflag &= ~CSIZE;
      termbuf.c_cflag |= CS7|PARENB;
      termbuf.c_oflag |= OPOST;
    }
}

int
tty_isbinaryin(void)
{
    return(!(termbuf.c_iflag & ISTRIP));
}

int
tty_isbinaryout(void)
{
    return(!(termbuf.c_oflag&OPOST));
}


int
tty_issofttab(void)
{
# ifdef     OXTABS
    return (termbuf.c_oflag & OXTABS);
# endif
# ifdef     TABDLY
    return ((termbuf.c_oflag & TABDLY) == TAB3);
# endif
}

void
tty_setsofttab(int on)
{
    if (on) {
# ifdef     OXTABS
      termbuf.c_oflag |= OXTABS;
# endif
# ifdef     TABDLY
      termbuf.c_oflag &= ~TABDLY;
      termbuf.c_oflag |= TAB3;
# endif
    } else {
# ifdef     OXTABS
      termbuf.c_oflag &= ~OXTABS;
# endif
# ifdef     TABDLY
      termbuf.c_oflag &= ~TABDLY;
      termbuf.c_oflag |= TAB0;
# endif
    }
}

int
tty_islitecho(void)
{
# ifdef     ECHOCTL
    return (!(termbuf.c_lflag & ECHOCTL));
# endif
# ifdef     TCTLECH
    return (!(termbuf.c_lflag & TCTLECH));
# endif
# if  !defined(ECHOCTL) && !defined(TCTLECH)
    return (0);   /* assumes ctl chars are echoed '^x' */
# endif
}

void
tty_setlitecho(int on)
{
# ifdef     ECHOCTL
    if (on)
      termbuf.c_lflag &= ~ECHOCTL;
    else
      termbuf.c_lflag |= ECHOCTL;
# endif
# ifdef     TCTLECH
    if (on)
      termbuf.c_lflag &= ~TCTLECH;
    else
      termbuf.c_lflag |= TCTLECH;
# endif
}

int
tty_iscrnl(void)
{
    return (termbuf.c_iflag & ICRNL);
}

/*
 * Try to guess whether speeds are "encoded" (4.2BSD) or just numeric (4.4BSD).
 */
#if B4800 != 4800
#define     DECODE_BAUD
#endif

#ifdef      DECODE_BAUD

/*
 * A table of available terminal speeds
 */
struct termspeeds {
    int     speed;
    int     value;
} termspeeds[] = {
    { 0,      B0 },      { 50,    B50 },    { 75,     B75 },
    { 110,    B110 },    { 134,   B134 },   { 150,    B150 },
    { 200,    B200 },    { 300,   B300 },   { 600,    B600 },
    { 1200,   B1200 },   { 1800,  B1800 },  { 2400,   B2400 },
    { 4800,   B4800 },
#ifdef      B7200
    { 7200,  B7200 },
#endif
    { 9600,   B9600 },
#ifdef      B14400
    { 14400,  B14400 },
#endif
#ifdef      B19200
    { 19200,  B19200 },
#endif
#ifdef      B28800
    { 28800,  B28800 },
#endif
#ifdef      B38400
    { 38400,  B38400 },
#endif
#ifdef      B57600
    { 57600,  B57600 },
#endif
#ifdef      B115200
    { 115200, B115200 },
#endif
#ifdef      B230400
    { 230400, B230400 },
#endif
    { -1,     0 }
};
#endif      /* DECODE_BUAD */

void
tty_tspeed(int val)
{
#ifdef      DECODE_BAUD
    struct termspeeds *tp;

    for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
      ;
    if (tp->speed == -1)      /* back up to last valid value */
      --tp;
    cfsetospeed(&termbuf, tp->value);
#else /* DECODE_BUAD */
    cfsetospeed(&termbuf, val);
#endif      /* DECODE_BUAD */
}

void
tty_rspeed(int val)
{
#ifdef      DECODE_BAUD
    struct termspeeds *tp;

    for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
      ;
    if (tp->speed == -1)      /* back up to last valid value */
      --tp;
    cfsetispeed(&termbuf, tp->value);
#else /* DECODE_BAUD */
    cfsetispeed(&termbuf, val);
#endif      /* DECODE_BAUD */
}

#ifdef PARENT_DOES_UTMP
extern      struct utmp wtmp;
extern char wtmpf[];

extern void utmp_sig_init (void);
extern void utmp_sig_reset (void);
extern void utmp_sig_wait (void);
extern void utmp_sig_notify (int);
# endif /* PARENT_DOES_UTMP */

#ifdef STREAMSPTY

/* I_FIND seems to live a life of its own */
static int my_find(int fd, char *module)
{
#if defined(I_FIND) && defined(I_LIST)
    static int flag;
    static struct str_list sl;
    int n;
    int i;
  
    if(!flag){
      n = ioctl(fd, I_LIST, 0);
      if(n < 0){
          perror("ioctl(fd, I_LIST, 0)");
          return -1;
      }
      sl.sl_modlist=(struct str_mlist*)malloc(n * sizeof(struct str_mlist));
      sl.sl_nmods = n;
      n = ioctl(fd, I_LIST, &sl);
      if(n < 0){
          perror("ioctl(fd, I_LIST, n)");
          return -1;
      }
      flag = 1;
    }
  
    for(i=0; i<sl.sl_nmods; i++)
      if(!strcmp(sl.sl_modlist[i].l_name, module))
          return 1;
#endif
    return 0;
}

static void maybe_push_modules(int fd, char **modules)
{
    char **p;
    int err;

    for(p=modules; *p; p++){
      err = my_find(fd, *p);
      if(err == 1)
          break;
      if(err < 0 && errno != EINVAL)
          fatalperror(net, "my_find()");
      /* module not pushed or does not exist */
    }
    /* p points to null or to an already pushed module, now push all
       modules before this one */
  
    for(p--; p >= modules; p--){
      err = ioctl(fd, I_PUSH, *p);
      if(err < 0 && errno != EINVAL)
          fatalperror(net, "I_PUSH");
    }
}
#endif

/*
 * getptyslave()
 *
 * Open the slave side of the pty, and do any initialization
 * that is necessary.  The return value is a file descriptor
 * for the slave side.
 */
void getptyslave(void)
{
    int t = -1;

    struct winsize ws;
    /*
     * Opening the slave side may cause initilization of the
     * kernel tty structure.  We need remember the state of
     *      if linemode was turned on
     *      terminal window size
     *      terminal speed
     * so that we can re-set them if we need to.
     */


    /*
     * Make sure that we don't have a controlling tty, and
     * that we are the session (process group) leader.
     */

#ifdef HAVE_SETSID
    if(setsid()<0)
      fatalperror(net, "setsid()");
#else
# ifdef     TIOCNOTTY
    t = open(_PATH_TTY, O_RDWR);
    if (t >= 0) {
      ioctl(t, TIOCNOTTY, (char *)0);
      close(t);
    }
# endif
#endif

# ifdef PARENT_DOES_UTMP
    /*
     * Wait for our parent to get the utmp stuff to get done.
     */
    utmp_sig_wait();
# endif

    t = cleanopen(line);
    if (t < 0)
      fatalperror(net, line);

#ifdef  STREAMSPTY
    ttyfd = t;
        

    /*
     * Not all systems have (or need) modules ttcompat and pckt so
     * don't flag it as a fatal error if they don't exist.
     */

    if (really_stream)
      {
          /* these are the streams modules that we want pushed. note
             that they are in reverse order, ptem will be pushed
             first. maybe_push_modules() will try to push all modules
             before the first one that isn't already pushed. i.e if
             ldterm is pushed, only ttcompat will be attempted.

             all this is because we don't know which modules are
             available, and we don't know which modules are already
             pushed (via autopush, for instance).

             */
           
          char *ttymodules[] = { "ttcompat", "ldterm", "ptem", NULL };
          char *ptymodules[] = { "pckt", NULL };

          maybe_push_modules(t, ttymodules);
          maybe_push_modules(ourpty, ptymodules);
      }
#endif
    /*
     * set up the tty modes as we like them to be.
     */
    init_termbuf();
# ifdef     TIOCSWINSZ
    if (def_row || def_col) {
      memset(&ws, 0, sizeof(ws));
      ws.ws_col = def_col;
      ws.ws_row = def_row;
      ioctl(t, TIOCSWINSZ, (char *)&ws);
    }
# endif

    /*
     * Settings for sgtty based systems
     */

    /*
     * Settings for UNICOS (and HPUX)
     */
# if defined(_CRAY) || defined(__hpux)
    termbuf.c_oflag = OPOST|ONLCR|TAB3;
    termbuf.c_iflag = IGNPAR|ISTRIP|ICRNL|IXON;
    termbuf.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK;
    termbuf.c_cflag = EXTB|HUPCL|CS8;
# endif

    /*
     * Settings for all other termios/termio based
     * systems, other than 4.4BSD.  In 4.4BSD the
     * kernel does the initial terminal setup.
     */
# if !(defined(_CRAY) || defined(__hpux)) && (BSD <= 43)
#  ifndef   OXTABS
#   define OXTABS 0
#  endif
    termbuf.c_lflag |= ECHO;
    termbuf.c_oflag |= ONLCR|OXTABS;
    termbuf.c_iflag |= ICRNL;
    termbuf.c_iflag &= ~IXOFF;
# endif
    tty_rspeed((def_rspeed > 0) ? def_rspeed : 9600);
    tty_tspeed((def_tspeed > 0) ? def_tspeed : 9600);

    /*
     * Set the tty modes, and make this our controlling tty.
     */
    set_termbuf();
    if (login_tty(t) == -1)
      fatalperror(net, "login_tty");
    if (net > 2)
      close(net);
    if (ourpty > 2) {
      close(ourpty);
      ourpty = -1;
    }
}

#ifndef     O_NOCTTY
#define     O_NOCTTY    0
#endif
/*
 * Open the specified slave side of the pty,
 * making sure that we have a clean tty.
 */

int cleanopen(char *line)
{
    int t;

#ifdef STREAMSPTY
    if (!really_stream)
#endif
      {
          /*
           * Make sure that other people can't open the
           * slave side of the connection.
           */
          chown(line, 0, 0);
          chmod(line, 0600);
      }

#ifdef HAVE_REVOKE
    revoke(line);
#endif

    t = open(line, O_RDWR|O_NOCTTY);

    if (t < 0)
      return(-1);

    /*
     * Hangup anybody else using this ttyp, then reopen it for
     * ourselves.
     */
# if !(defined(_CRAY) || defined(__hpux)) && (BSD <= 43) && !defined(STREAMSPTY)
    signal(SIGHUP, SIG_IGN);
#ifdef HAVE_VHANGUP
    vhangup();
#else
#endif
    signal(SIGHUP, SIG_DFL);
    t = open(line, O_RDWR|O_NOCTTY);
    if (t < 0)
      return(-1);
# endif
# if  defined(_CRAY) && defined(TCVHUP)
    {
      int i;
      signal(SIGHUP, SIG_IGN);
      ioctl(t, TCVHUP, (char *)0);
      signal(SIGHUP, SIG_DFL);

      i = open(line, O_RDWR);

      if (i < 0)
          return(-1);
      close(t);
      t = i;
    }
# endif     /* defined(CRAY) && defined(TCVHUP) */
    return(t);
}

#if !defined(BSD4_4)

int login_tty(int t)
{
# if defined(TIOCSCTTY) && !defined(__hpux)
    if (ioctl(t, TIOCSCTTY, (char *)0) < 0)
      fatalperror(net, "ioctl(sctty)");
#  ifdef _CRAY
    /*
     * Close the hard fd to /dev/ttypXXX, and re-open through
     * the indirect /dev/tty interface.
     */
    close(t);
    if ((t = open("/dev/tty", O_RDWR)) < 0)
      fatalperror(net, "open(/dev/tty)");
#  endif
# else
    /*
     * We get our controlling tty assigned as a side-effect
     * of opening up a tty device.  But on BSD based systems,
     * this only happens if our process group is zero.  The
     * setsid() call above may have set our pgrp, so clear
     * it out before opening the tty...
     */
#ifdef HAVE_SETPGID
    setpgid(0, 0);
#else
    setpgrp(0, 0); /* if setpgid isn't available, setpgrp
                  probably takes arguments */
#endif
    close(open(line, O_RDWR));
# endif
    if (t != 0)
      dup2(t, 0);
    if (t != 1)
      dup2(t, 1);
    if (t != 2)
      dup2(t, 2);
    if (t > 2)
      close(t);
    return(0);
}
#endif      /* BSD <= 43 */

/*
 * This comes from ../../bsd/tty.c and should not really be here.
 */

/*
 * Clean the tty name.  Return a pointer to the cleaned version.
 */

static char *
clean_ttyname (char *tty)
{
  char *res = tty;

  if (strncmp (res, _PATH_DEV, strlen(_PATH_DEV)) == 0)
    res += strlen(_PATH_DEV);
  if (strncmp (res, "pty/", 4) == 0)
    res += 4;
  if (strncmp (res, "ptym/", 5) == 0)
    res += 5;
  return res;
}

/*
 * Generate a name usable as an `ut_id', typically without `tty'.
 */

#ifdef HAVE_STRUCT_UTMP_UT_ID
static char *
make_id (char *tty)
{
  char *res = tty;
  
  if (strncmp (res, "pts/", 4) == 0)
    res += 4;
  if (strncmp (res, "tty", 3) == 0)
    res += 3;
  return res;
}
#endif

/*
 * startslave(host)
 *
 * Given a hostname, do whatever
 * is necessary to startup the login process on the slave side of the pty.
 */

/* ARGSUSED */
void
startslave(const char *host, const char *utmp_host,
         int autologin, char *autoname)
{
    int i;

#ifdef AUTHENTICATION
    if (!autoname || !autoname[0])
      autologin = 0;

    if (autologin < auth_level) {
      fatal(net, "Authorization failed");
      exit(1);
    }
#endif

    {
      char *tbuf =
          "\r\n*** Connection not encrypted! "
          "Communication may be eavesdropped. ***\r\n";
#ifdef ENCRYPTION
      if (!no_warn && (encrypt_output == 0 || decrypt_input == 0))
#endif
          writenet((unsigned char*)tbuf, strlen(tbuf));
    }
# ifdef     PARENT_DOES_UTMP
    utmp_sig_init();
# endif     /* PARENT_DOES_UTMP */

    if ((i = fork()) < 0)
      fatalperror(net, "fork");
    if (i) {
# ifdef PARENT_DOES_UTMP
      /*
       * Cray parent will create utmp entry for child and send
       * signal to child to tell when done.  Child waits for signal
       * before doing anything important.
       */
      int pid = i;
      void sigjob (int);

      setpgrp();
      utmp_sig_reset();       /* reset handler to default */
      /*
       * Create utmp entry for child
       */
      wtmp.ut_time = time(NULL);
      wtmp.ut_type = LOGIN_PROCESS;
      wtmp.ut_pid = pid;
      strncpy(wtmp.ut_user,  "LOGIN", sizeof(wtmp.ut_user));
      strncpy(wtmp.ut_host,  utmp_host, sizeof(wtmp.ut_host));
      strncpy(wtmp.ut_line,  clean_ttyname(line), sizeof(wtmp.ut_line));
#ifdef HAVE_STRUCT_UTMP_UT_ID
      strncpy(wtmp.ut_id, wtmp.ut_line + 3, sizeof(wtmp.ut_id));
#endif

      pututline(&wtmp);
      endutent();
      if ((i = open(wtmpf, O_WRONLY|O_APPEND)) >= 0) {
          write(i, &wtmp, sizeof(struct utmp));
          close(i);
      }
#ifdef      _CRAY
      signal(WJSIGNAL, sigjob);
#endif
      utmp_sig_notify(pid);
# endif     /* PARENT_DOES_UTMP */
    } else {
      getptyslave();
#if defined(DCE)
      /* if we authenticated via K5, try and join the PAG */
      kerberos5_dfspag();
#endif
      start_login(host, autologin, autoname);
      /*NOTREACHED*/
    }
}

char  *envinit[3];
extern char **environ;

void
init_env(void)
{
    char **envp;

    envp = envinit;
    if ((*envp = getenv("TZ")))
      *envp++ -= 3;
#if defined(_CRAY) || defined(__hpux)
    else
      *envp++ = "TZ=GMT0";
#endif
    *envp = 0;
    environ = envinit;
}

/*
 * scrub_env()
 *
 * We only accept the environment variables listed below.
 */

static void
scrub_env(void)
{
    static const char *reject[] = {
      "TERMCAP=/",
      NULL
    };

    static const char *accept[] = {
      "XAUTH=", "XAUTHORITY=", "DISPLAY=",
      "TERM=",
      "EDITOR=",
      "PAGER=",
      "PRINTER=",
      "LOGNAME=",
      "POSIXLY_CORRECT=",
      "TERMCAP=",
      NULL
    };

    char **cpp, **cpp2;
    const char **p;
  
    for (cpp2 = cpp = environ; *cpp; cpp++) {
      int reject_it = 0;

      for(p = reject; *p; p++)
          if(strncmp(*cpp, *p, strlen(*p)) == 0) {
            reject_it = 1;
            break;
          }
      if (reject_it)
          continue;

      for(p = accept; *p; p++)
          if(strncmp(*cpp, *p, strlen(*p)) == 0)
            break;
      if(*p != NULL)
          *cpp2++ = *cpp;
    }
    *cpp2 = NULL;
}


struct arg_val {
    int size;
    int argc;
    const char **argv;
};

static void addarg(struct arg_val*, const char*);

/*
 * start_login(host)
 *
 * Assuming that we are now running as a child processes, this
 * function will turn us into the login process.
 */

void
start_login(const char *host, int autologin, char *name)
{
    struct arg_val argv;
    char *user;
    int save_errno;

#ifdef HAVE_UTMPX_H
    int pid = getpid();
    struct utmpx utmpx;
    char *clean_tty;

    /*
     * Create utmp entry for child
     */

    clean_tty = clean_ttyname(line);
    memset(&utmpx, 0, sizeof(utmpx));
    strncpy(utmpx.ut_user,  ".telnet", sizeof(utmpx.ut_user));
    strncpy(utmpx.ut_line,  clean_tty, sizeof(utmpx.ut_line));
#ifdef HAVE_STRUCT_UTMP_UT_ID
    strncpy(utmpx.ut_id, make_id(clean_tty), sizeof(utmpx.ut_id));
#endif
    utmpx.ut_pid = pid;
      
    utmpx.ut_type = LOGIN_PROCESS;

    gettimeofday (&utmpx.ut_tv, NULL);
    if (pututxline(&utmpx) == NULL)
      fatal(net, "pututxline failed");
#endif

    scrub_env();
      
    /*
     * -h : pass on name of host.
     *            WARNING:  -h is accepted by login if and only if
     *                  getuid() == 0.
     * -p : don't clobber the environment (so terminal type stays set).
     *
     * -f : force this login, he has already been authenticated
     */

    /* init argv structure */ 
    argv.size=0;
    argv.argc=0;
    argv.argv=malloc(0); /*so we can call realloc later */
    addarg(&argv, "login");
    addarg(&argv, "-h");
    addarg(&argv, host);
    addarg(&argv, "-p");
    if(name[0])
      user = name;
    else
      user = getenv("USER");
#ifdef AUTHENTICATION
    if (auth_level < 0 || autologin != AUTH_VALID) {
      if(!no_warn) {
          printf("User not authenticated. ");
          if (require_otp)
            printf("Using one-time password\r\n");
          else
            printf("Using plaintext username and password\r\n");
      }
      if (require_otp) {
          addarg(&argv, "-a");
          addarg(&argv, "otp");
      }
      if(log_unauth) 
          syslog(LOG_INFO, "unauthenticated access from %s (%s)", 
               host, user ? user : "unknown user");
    }
    if (auth_level >= 0 && autologin == AUTH_VALID)
      addarg(&argv, "-f");
#endif
    if(user){
      addarg(&argv, "--");
      addarg(&argv, strdup(user));
    }
    if (getenv("USER")) {
      /*
       * Assume that login will set the USER variable
       * correctly.  For SysV systems, this means that
       * USER will no longer be set, just LOGNAME by
       * login.  (The problem is that if the auto-login
       * fails, and the user then specifies a different
       * account name, he can get logged in with both
       * LOGNAME and USER in his environment, but the
       * USER value will be wrong.
       */
      unsetenv("USER");
    }
    closelog();
    /*
     * This sleep(1) is in here so that telnetd can
     * finish up with the tty.  There's a race condition
     * the login banner message gets lost...
     */
    sleep(1);

    execv(new_login, argv.argv);
    save_errno = errno;
    syslog(LOG_ERR, "%s: %m\n", new_login);
    fatalperror_errno(net, new_login, save_errno);
    /*NOTREACHED*/
}

static void
addarg(struct arg_val *argv, const char *val)
{
    if(argv->size <= argv->argc+1) {
      argv->argv = realloc(argv->argv, sizeof(char*) * (argv->size + 10));
      if (argv->argv == NULL)
          fatal (net, "realloc: out of memory");
      argv->size+=10;
    }
    argv->argv[argv->argc++] = val;
    argv->argv[argv->argc]   = NULL;
}


/*
 * rmut()
 *
 * This is the function called by cleanup() to
 * remove the utmp entry for this person.
 */

#ifdef HAVE_UTMPX_H
static void
rmut(void)
{
    struct utmpx utmpx, *non_save_utxp;
    char *clean_tty = clean_ttyname(line);

    /*
     * This updates the utmpx and utmp entries and make a wtmp/x entry
     */

    setutxent();
    memset(&utmpx, 0, sizeof(utmpx));
    strncpy(utmpx.ut_line, clean_tty, sizeof(utmpx.ut_line));
    utmpx.ut_type = LOGIN_PROCESS;
    non_save_utxp = getutxline(&utmpx);
    if (non_save_utxp) {
      struct utmpx *utxp;
      char user0;

      utxp = malloc(sizeof(struct utmpx));
      *utxp = *non_save_utxp;
      user0 = utxp->ut_user[0];
      utxp->ut_user[0] = '\0';
      utxp->ut_type = DEAD_PROCESS;
#ifdef HAVE_STRUCT_UTMPX_UT_EXIT
#ifdef _STRUCT___EXIT_STATUS
      utxp->ut_exit.__e_termination = 0;
      utxp->ut_exit.__e_exit = 0;
#elif defined(__osf__) /* XXX */
      utxp->ut_exit.ut_termination = 0;
      utxp->ut_exit.ut_exit = 0;
#else 
      utxp->ut_exit.e_termination = 0;
      utxp->ut_exit.e_exit = 0;
#endif
#endif
      gettimeofday(&utxp->ut_tv, NULL);
      pututxline(utxp);
#ifdef WTMPX_FILE
      utxp->ut_user[0] = user0;
      updwtmpx(WTMPX_FILE, utxp);
#elif defined(WTMP_FILE)
      /* This is a strange system with a utmpx and a wtmp! */
      {
        int f = open(wtmpf, O_WRONLY|O_APPEND);
        struct utmp wtmp;
        if (f >= 0) {
          strncpy(wtmp.ut_line,  clean_tty, sizeof(wtmp.ut_line));
          strncpy(wtmp.ut_name,  "", sizeof(wtmp.ut_name));
#ifdef HAVE_STRUCT_UTMP_UT_HOST
          strncpy(wtmp.ut_host,  "", sizeof(wtmp.ut_host));
#endif
          wtmp.ut_time = time(NULL);
          write(f, &wtmp, sizeof(wtmp));
          close(f);
        }
      }
#endif
      free (utxp);
    }
    endutxent();
}  /* end of rmut */
#endif

#if !defined(HAVE_UTMPX_H) && !(defined(_CRAY) || defined(__hpux)) && BSD <= 43
static void
rmut(void)
{
    int f;
    int found = 0;
    struct utmp *u, *utmp;
    int nutmp;
    struct stat statbf;
    char *clean_tty = clean_ttyname(line);

    f = open(utmpf, O_RDWR);
    if (f >= 0) {
      fstat(f, &statbf);
      utmp = (struct utmp *)malloc((unsigned)statbf.st_size);
      if (!utmp)
          syslog(LOG_ERR, "utmp malloc failed");
      if (statbf.st_size && utmp) {
          nutmp = read(f, utmp, (int)statbf.st_size);
          nutmp /= sizeof(struct utmp);

          for (u = utmp ; u < &utmp[nutmp] ; u++) {
            if (strncmp(u->ut_line,
                      clean_tty,
                      sizeof(u->ut_line)) ||
                u->ut_name[0]==0)
                continue;
            lseek(f, ((long)u)-((long)utmp), L_SET);
            strncpy(u->ut_name,  "", sizeof(u->ut_name));
#ifdef HAVE_STRUCT_UTMP_UT_HOST
            strncpy(u->ut_host,  "", sizeof(u->ut_host));
#endif
            u->ut_time = time(NULL);
            write(f, u, sizeof(wtmp));
            found++;
          }
      }
      close(f);
    }
    if (found) {
      f = open(wtmpf, O_WRONLY|O_APPEND);
      if (f >= 0) {
          strncpy(wtmp.ut_line,  clean_tty, sizeof(wtmp.ut_line));
          strncpy(wtmp.ut_name,  "", sizeof(wtmp.ut_name));
#ifdef HAVE_STRUCT_UTMP_UT_HOST
          strncpy(wtmp.ut_host,  "", sizeof(wtmp.ut_host));
#endif
          wtmp.ut_time = time(NULL);
          write(f, &wtmp, sizeof(wtmp));
          close(f);
      }
    }
    chmod(line, 0666);
    chown(line, 0, 0);
    line[strlen("/dev/")] = 'p';
    chmod(line, 0666);
    chown(line, 0, 0);
}  /* end of rmut */
#endif      /* CRAY */

#if defined(__hpux) && !defined(HAVE_UTMPX_H)
static void
rmut (char *line)
{
    struct utmp utmp;
    struct utmp *utptr;
    int fd;             /* for /etc/wtmp */

    utmp.ut_type = USER_PROCESS;
    strncpy(utmp.ut_line, clean_ttyname(line), sizeof(utmp.ut_line));
    setutent();
    utptr = getutline(&utmp);
    /* write it out only if it exists */
    if (utptr) {
      utptr->ut_type = DEAD_PROCESS;
      utptr->ut_time = time(NULL);
      pututline(utptr);
      /* set wtmp entry if wtmp file exists */
      if ((fd = open(wtmpf, O_WRONLY | O_APPEND)) >= 0) {
          write(fd, utptr, sizeof(utmp));
          close(fd);
      }
    }
    endutent();

    chmod(line, 0666);
    chown(line, 0, 0);
    line[14] = line[13];
    line[13] = line[12];
    line[8] = 'm';
    line[9] = '/';
    line[10] = 'p';
    line[11] = 't';
    line[12] = 'y';
    chmod(line, 0666);
    chown(line, 0, 0);
}
#endif

/*
 * cleanup()
 *
 * This is the routine to call when we are all through, to
 * clean up anything that needs to be cleaned up.
 */

#ifdef PARENT_DOES_UTMP

void
cleanup(int sig)
{
#ifdef _CRAY
    static int incleanup = 0;
    int t;
    int child_status; /* status of child process as returned by waitpid */
    int flags = WNOHANG|WUNTRACED;
    
    /*
     * 1: Pick up the zombie, if we are being called
     *    as the signal handler.
     * 2: If we are a nested cleanup(), return.
     * 3: Try to clean up TMPDIR.
     * 4: Fill in utmp with shutdown of process.
     * 5: Close down the network and pty connections.
     * 6: Finish up the TMPDIR cleanup, if needed.
     */
    if (sig == SIGCHLD) {
      while (waitpid(-1, &child_status, flags) > 0)
          ; /* VOID */
      /* Check if the child process was stopped
       * rather than exited.  We want cleanup only if
       * the child has died.
       */
      if (WIFSTOPPED(child_status)) {
          return;
      }
    }
    t = sigblock(sigmask(SIGCHLD));
    if (incleanup) {
      sigsetmask(t);
      return;
    }
    incleanup = 1;
    sigsetmask(t);
    
    t = cleantmp(&wtmp);
    setutent();   /* just to make sure */
#endif /* CRAY */
    rmut(line);
    close(ourpty);
    shutdown(net, 2);
#ifdef _CRAY
    if (t == 0)
      cleantmp(&wtmp);
#endif /* CRAY */
    exit(1);
}

#else /* PARENT_DOES_UTMP */

void
cleanup(int sig)
{
#if defined(HAVE_UTMPX_H) || !defined(HAVE_LOGWTMP)
    rmut();
#ifdef HAVE_VHANGUP
#ifndef __sgi
    vhangup(); /* XXX */
#endif
#endif
#else
    char *p;
    
    p = line + sizeof("/dev/") - 1;
    if (logout(p))
      logwtmp(p, "", "");
    chmod(line, 0666);
    chown(line, 0, 0);
    *p = 'p';
    chmod(line, 0666);
    chown(line, 0, 0);
#endif
    shutdown(net, 2);
    exit(1);
}

#endif /* PARENT_DOES_UTMP */

#ifdef PARENT_DOES_UTMP
/*
 * _utmp_sig_rcv
 * utmp_sig_init
 * utmp_sig_wait
 *    These three functions are used to coordinate the handling of
 *    the utmp file between the server and the soon-to-be-login shell.
 *    The server actually creates the utmp structure, the child calls
 *    utmp_sig_wait(), until the server calls utmp_sig_notify() and
 *    signals the future-login shell to proceed.
 */
static int caught=0;          /* NZ when signal intercepted */
static void (*func)();        /* address of previous handler */

void
_utmp_sig_rcv(sig)
     int sig;
{
    caught = 1;
    signal(SIGUSR1, func);
}

void
utmp_sig_init()
{
    /*
     * register signal handler for UTMP creation
     */
    if ((int)(func = signal(SIGUSR1, _utmp_sig_rcv)) == -1)
      fatalperror(net, "telnetd/signal");
}

void
utmp_sig_reset()
{
    signal(SIGUSR1, func);    /* reset handler to default */
}

# ifdef __hpux
# define sigoff() /* do nothing */
# define sigon() /* do nothing */
# endif

void
utmp_sig_wait()
{
    /*
     * Wait for parent to write our utmp entry.
       */
    sigoff();
    while (caught == 0) {
      pause();    /* wait until we get a signal (sigon) */
      sigoff();   /* turn off signals while we check caught */
    }
    sigon();            /* turn on signals again */
}

void
utmp_sig_notify(pid)
{
    kill(pid, SIGUSR1);
}

#ifdef _CRAY
static int gotsigjob = 0;

      /*ARGSUSED*/
void
sigjob(sig)
     int sig;
{
    int jid;
    struct jobtemp *jp;

    while ((jid = waitjob(NULL)) != -1) {
      if (jid == 0) {
          return;
      }
      gotsigjob++;
      jobend(jid, NULL, NULL);
    }
}

/*
 *    jid_getutid:
 *          called by jobend() before calling cleantmp()
 *          to find the correct $TMPDIR to cleanup.
 */

struct utmp *
jid_getutid(jid)
     int jid;
{
    struct utmp *cur = NULL;

    setutent();   /* just to make sure */
    while (cur = getutent()) {
      if ( (cur->ut_type != NULL) && (jid == cur->ut_jid) ) {
          return(cur);
      }
    }

    return(0);
}

/*
 * Clean up the TMPDIR that login created.
 * The first time this is called we pick up the info
 * from the utmp.  If the job has already gone away,
 * then we'll clean up and be done.  If not, then
 * when this is called the second time it will wait
 * for the signal that the job is done.
 */
int
cleantmp(wtp)
     struct utmp *wtp;
{
    struct utmp *utp;
    static int first = 1;
    int mask, omask, ret;
    extern struct utmp *getutid (const struct utmp *_Id);


    mask = sigmask(WJSIGNAL);

    if (first == 0) {
      omask = sigblock(mask);
      while (gotsigjob == 0)
          sigpause(omask);
      return(1);
    }
    first = 0;
    setutent();   /* just to make sure */

    utp = getutid(wtp);
    if (utp == 0) {
      syslog(LOG_ERR, "Can't get /etc/utmp entry to clean TMPDIR");
      return(-1);
    }
    /*
     * Nothing to clean up if the user shell was never started.
     */
    if (utp->ut_type != USER_PROCESS || utp->ut_jid == 0)
      return(1);

    /*
     * Block the WJSIGNAL while we are in jobend().
     */
    omask = sigblock(mask);
    ret = jobend(utp->ut_jid, utp->ut_tpath, utp->ut_user);
    sigsetmask(omask);
    return(ret);
}

int
jobend(jid, path, user)
     int jid;
     char *path;
     char *user;
{
    static int saved_jid = 0;
    static int pty_saved_jid = 0;
    static char saved_path[sizeof(wtmp.ut_tpath)+1];
    static char saved_user[sizeof(wtmp.ut_user)+1];

    /*
     * this little piece of code comes into play
     * only when ptyreconnect is used to reconnect
     * to an previous session.
     *
     * this is the only time when the
     * "saved_jid != jid" code is executed.
     */

    if ( saved_jid && saved_jid != jid ) {
      if (!path) {      /* called from signal handler */
          pty_saved_jid = jid;
      } else {
          pty_saved_jid = saved_jid;
      }
    }

    if (path) {
      strncpy(saved_path, path, sizeof(wtmp.ut_tpath));
      strncpy(saved_user, user, sizeof(wtmp.ut_user));
      saved_path[sizeof(saved_path)] = '\0';
      saved_user[sizeof(saved_user)] = '\0';
    }
    if (saved_jid == 0) {
      saved_jid = jid;
      return(0);
    }

    /* if the jid has changed, get the correct entry from the utmp file */

    if ( saved_jid != jid ) {
      struct utmp *utp = NULL;
      struct utmp *jid_getutid();

      utp = jid_getutid(pty_saved_jid);

      if (utp == 0) {
          syslog(LOG_ERR, "Can't get /etc/utmp entry to clean TMPDIR");
          return(-1);
      }

      cleantmpdir(jid, utp->ut_tpath, utp->ut_user);
      return(1);
    }

    cleantmpdir(jid, saved_path, saved_user);
    return(1);
}

/*
 * Fork a child process to clean up the TMPDIR
 */
cleantmpdir(jid, tpath, user)
     int jid;
     char *tpath;
     char *user;
{
    switch(fork()) {
    case -1:
      syslog(LOG_ERR, "TMPDIR cleanup(%s): fork() failed: %m\n",
             tpath);
      break;
    case 0:
      execl(CLEANTMPCMD, CLEANTMPCMD, user, tpath, 0);
      syslog(LOG_ERR, "TMPDIR cleanup(%s): execl(%s) failed: %m\n",
             tpath, CLEANTMPCMD);
      exit(1);
    default:
      /*
       * Forget about child.  We will exit, and
       * /etc/init will pick it up.
       */
      break;
    }
}
#endif /* CRAY */
#endif      /* defined(PARENT_DOES_UTMP) */

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