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utility.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.
 */

#define PRINTOPTIONS
#include "telnetd.h"

RCSID("$Id: utility.c,v 1.27 2001/09/03 05:54:17 assar Exp $");

/*
 * utility functions performing io related tasks
 */

/*
 * ttloop
 *
 * A small subroutine to flush the network output buffer, get some
 * data from the network, and pass it through the telnet state
 * machine.  We also flush the pty input buffer (by dropping its data)
 * if it becomes too full.
 *
 * return 0 if OK or 1 if interrupted by a signal.
 */

int
ttloop(void)
{
    DIAG(TD_REPORT, {
      output_data("td: ttloop\r\n");
    });
    if (nfrontp-nbackp)
      netflush();
    ncc = read(net, netibuf, sizeof netibuf);
    if (ncc < 0) {
      if (errno == EINTR)
          return 1;
      syslog(LOG_INFO, "ttloop:  read: %m\n");
      exit(1);
    } else if (ncc == 0) {
      syslog(LOG_INFO, "ttloop:  peer died\n");
      exit(1);
    }
    DIAG(TD_REPORT, {
      output_data("td: ttloop read %d chars\r\n", ncc);
    });
    netip = netibuf;
    telrcv();                 /* state machine */
    if (ncc > 0) {
      pfrontp = pbackp = ptyobuf;
      telrcv();
    }
    return 0;
}  /* end of ttloop */

/*
 * Check a descriptor to see if out of band data exists on it.
 */
int
stilloob(int s)
{
    static struct timeval timeout = { 0 };
    fd_set  excepts;
    int value;

    if (s >= FD_SETSIZE)
      fatal(ourpty, "fd too large");

    do {
      FD_ZERO(&excepts);
      FD_SET(s, &excepts);
      value = select(s+1, 0, 0, &excepts, &timeout);
    } while ((value == -1) && (errno == EINTR));

    if (value < 0) {
      fatalperror(ourpty, "select");
    }
    if (FD_ISSET(s, &excepts)) {
      return 1;
    } else {
      return 0;
    }
}

void
ptyflush(void)
{
    int n;

    if ((n = pfrontp - pbackp) > 0) {
      DIAG((TD_REPORT | TD_PTYDATA), { 
          output_data("td: ptyflush %d chars\r\n", n);
      });
      DIAG(TD_PTYDATA, printdata("pd", pbackp, n));
      n = write(ourpty, pbackp, n);
    }
    if (n < 0) {
      if (errno == EWOULDBLOCK || errno == EINTR)
          return;
      cleanup(0);
    }
    pbackp += n;
    if (pbackp == pfrontp)
      pbackp = pfrontp = ptyobuf;
}

/*
 * nextitem()
 *
 *    Return the address of the next "item" in the TELNET data
 * stream.  This will be the address of the next character if
 * the current address is a user data character, or it will
 * be the address of the character following the TELNET command
 * if the current address is a TELNET IAC ("I Am a Command")
 * character.
 */
char *
nextitem(char *current)
{
    if ((*current&0xff) != IAC) {
      return current+1;
    }
    switch (*(current+1)&0xff) {
    case DO:
    case DONT:
    case WILL:
    case WONT:
      return current+3;
    case SB:{
      /* loop forever looking for the SE */
      char *look = current+2;

      for (;;) {
          if ((*look++&0xff) == IAC) {
            if ((*look++&0xff) == SE) {
                return look;
            }
          }
      }
    }
    default:
      return current+2;
    }
}


/*
 * netclear()
 *
 *    We are about to do a TELNET SYNCH operation.  Clear
 * the path to the network.
 *
 *    Things are a bit tricky since we may have sent the first
 * byte or so of a previous TELNET command into the network.
 * So, we have to scan the network buffer from the beginning
 * until we are up to where we want to be.
 *
 *    A side effect of what we do, just to keep things
 * simple, is to clear the urgent data pointer.  The principal
 * caller should be setting the urgent data pointer AFTER calling
 * us in any case.
 */
void
netclear(void)
{
    char *thisitem, *next;
    char *good;
#define     wewant(p)   ((nfrontp > p) && ((*p&0xff) == IAC) && \
                   ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))

#ifdef ENCRYPTION
      thisitem = nclearto > netobuf ? nclearto : netobuf;
#else
      thisitem = netobuf;
#endif

      while ((next = nextitem(thisitem)) <= nbackp) {
          thisitem = next;
      }

      /* Now, thisitem is first before/at boundary. */

#ifdef ENCRYPTION
      good = nclearto > netobuf ? nclearto : netobuf;
#else
      good = netobuf;   /* where the good bytes go */
#endif

      while (nfrontp > thisitem) {
          if (wewant(thisitem)) {
            int length;

            next = thisitem;
            do {
                next = nextitem(next);
            } while (wewant(next) && (nfrontp > next));
            length = next-thisitem;
            memmove(good, thisitem, length);
            good += length;
            thisitem = next;
          } else {
            thisitem = nextitem(thisitem);
          }
      }

      nbackp = netobuf;
      nfrontp = good;         /* next byte to be sent */
      neturg = 0;
}  /* end of netclear */

extern int not42;

/*
 *  netflush
 *          Send as much data as possible to the network,
 *    handling requests for urgent data.
 */
void
netflush(void)
{
    int n;

    if ((n = nfrontp - nbackp) > 0) {
      DIAG(TD_REPORT,
           { n += output_data("td: netflush %d chars\r\n", n);
           });
#ifdef ENCRYPTION
      if (encrypt_output) {
          char *s = nclearto ? nclearto : nbackp;
          if (nfrontp - s > 0) {
            (*encrypt_output)((unsigned char *)s, nfrontp-s);
            nclearto = nfrontp;
          }
      }
#endif
      /*
       * if no urgent data, or if the other side appears to be an
       * old 4.2 client (and thus unable to survive TCP urgent data),
       * write the entire buffer in non-OOB mode.
       */
#if 1 /* remove this to make it work between solaris 2.6 and linux */
      if ((neturg == 0) || (not42 == 0)) {
#endif
          n = write(net, nbackp, n);      /* normal write */
#if 1 /* remove this to make it work between solaris 2.6 and linux */
      } else {
          n = neturg - nbackp;
          /*
           * In 4.2 (and 4.3) systems, there is some question about
           * what byte in a sendOOB operation is the "OOB" data.
           * To make ourselves compatible, we only send ONE byte
           * out of band, the one WE THINK should be OOB (though
           * we really have more the TCP philosophy of urgent data
           * rather than the Unix philosophy of OOB data).
           */
          if (n > 1) {
            n = send(net, nbackp, n-1, 0);      /* send URGENT all by itself */
          } else {
            n = send(net, nbackp, n, MSG_OOB);  /* URGENT data */
          }
      }
#endif
    }
    if (n < 0) {
      if (errno == EWOULDBLOCK || errno == EINTR)
          return;
      cleanup(0);
    }
    nbackp += n;
#ifdef ENCRYPTION
    if (nbackp > nclearto)
      nclearto = 0;
#endif
    if (nbackp >= neturg) {
      neturg = 0;
    }
    if (nbackp == nfrontp) {
      nbackp = nfrontp = netobuf;
#ifdef ENCRYPTION
      nclearto = 0;
#endif
    }
    return;
}


/*
 * writenet
 *
 * Just a handy little function to write a bit of raw data to the net.
 * It will force a transmit of the buffer if necessary
 *
 * arguments
 *    ptr - A pointer to a character string to write
 *    len - How many bytes to write
 */
void
writenet(unsigned char *ptr, int len)
{
    /* flush buffer if no room for new data) */
    while ((&netobuf[BUFSIZ] - nfrontp) < len) {
      /* if this fails, don't worry, buffer is a little big */
      netflush();
    }

    memmove(nfrontp, ptr, len);
    nfrontp += len;
}


/*
 * miscellaneous functions doing a variety of little jobs follow ...
 */


void fatal(int f, char *msg)
{
    char buf[BUFSIZ];

    snprintf(buf, sizeof(buf), "telnetd: %s.\r\n", msg);
#ifdef ENCRYPTION
    if (encrypt_output) {
      /*
       * Better turn off encryption first....
       * Hope it flushes...
       */
      encrypt_send_end();
      netflush();
    }
#endif
    write(f, buf, (int)strlen(buf));
    sleep(1);     /*XXX*/
    exit(1);
}

void
fatalperror_errno(int f, const char *msg, int error)
{
    char buf[BUFSIZ];
    
    snprintf(buf, sizeof(buf), "%s: %s", msg, strerror(error));
    fatal(f, buf);
}

void
fatalperror(int f, const char *msg)
{
    fatalperror_errno(f, msg, errno);
}

char editedhost[32];

void edithost(char *pat, char *host)
{
    char *res = editedhost;

    if (!pat)
      pat = "";
    while (*pat) {
      switch (*pat) {

      case '#':
          if (*host)
            host++;
          break;

      case '@':
          if (*host)
            *res++ = *host++;
          break;

      default:
          *res++ = *pat;
          break;
      }
      if (res == &editedhost[sizeof editedhost - 1]) {
          *res = '\0';
          return;
      }
      pat++;
    }
    if (*host)
      strlcpy (res, host,
                   sizeof editedhost - (res - editedhost));
    else
      *res = '\0';
    editedhost[sizeof editedhost - 1] = '\0';
}

static char *putlocation;

void
putstr(char *s)
{

    while (*s)
      putchr(*s++);
}

void
putchr(int cc)
{
    *putlocation++ = cc;
}

/*
 * This is split on two lines so that SCCS will not see the M
 * between two % signs and expand it...
 */
static char fmtstr[] = { "%l:%M" "%P on %A, %d %B %Y" };

void putf(char *cp, char *where)
{
#ifdef HAVE_UNAME
    struct utsname name;
#endif
    char *slash;
    time_t t;
    char db[100];

    /* if we don't have uname, set these to sensible values */
    char *sysname = "Unix", 
      *machine = "", 
      *release = "",
      *version = ""; 

#ifdef HAVE_UNAME
    uname(&name);
    sysname=name.sysname;
    machine=name.machine;
    release=name.release;
    version=name.version;
#endif

    putlocation = where;

    while (*cp) {
      if (*cp != '%') {
          putchr(*cp++);
          continue;
      }
      switch (*++cp) {

      case 't':
#ifdef      STREAMSPTY
          /* names are like /dev/pts/2 -- we want pts/2 */
          slash = strchr(line+1, '/');
#else
          slash = strrchr(line, '/');
#endif
          if (slash == (char *) 0)
            putstr(line);
          else
            putstr(&slash[1]);
          break;

      case 'h':
          putstr(editedhost);
          break;

      case 's':
          putstr(sysname);
          break;

      case 'm':
          putstr(machine);
          break;

      case 'r':
          putstr(release);
          break;

      case 'v':
          putstr(version);
          break;

      case 'd':
          time(&t);
          strftime(db, sizeof(db), fmtstr, localtime(&t));
          putstr(db);
          break;

      case '%':
          putchr('%');
          break;
      }
      cp++;
    }
}

#ifdef DIAGNOSTICS
/*
 * Print telnet options and commands in plain text, if possible.
 */
void
printoption(char *fmt, int option)
{
    if (TELOPT_OK(option))
      output_data("%s %s\r\n",
                fmt,
                TELOPT(option));
    else if (TELCMD_OK(option))
      output_data("%s %s\r\n",
                fmt,
                TELCMD(option));
    else
      output_data("%s %d\r\n",
                fmt,
                option);
    return;
}

void
printsub(int direction, unsigned char *pointer, int length)
                              /* '<' or '>' */
                              /* where suboption data sits */
                                          /* length of suboption data */
{
    int i = 0;
    unsigned char buf[512];

    if (!(diagnostic & TD_OPTIONS))
      return;

    if (direction) {
      output_data("td: %s suboption ",
                direction == '<' ? "recv" : "send");
      if (length >= 3) {
          int j;

          i = pointer[length-2];
          j = pointer[length-1];

          if (i != IAC || j != SE) {
            output_data("(terminated by ");
            if (TELOPT_OK(i))
                output_data("%s ",
                        TELOPT(i));
            else if (TELCMD_OK(i))
                output_data("%s ",
                        TELCMD(i));
            else
                output_data("%d ",
                        i);
            if (TELOPT_OK(j))
                output_data("%s",
                        TELOPT(j));
            else if (TELCMD_OK(j))
                output_data("%s",
                        TELCMD(j));
            else
                output_data("%d",
                        j);
            output_data(", not IAC SE!) ");
          }
      }
      length -= 2;
    }
    if (length < 1) {
      output_data("(Empty suboption??\?)");
      return;
    }
    switch (pointer[0]) {
    case TELOPT_TTYPE:
      output_data("TERMINAL-TYPE ");
      switch (pointer[1]) {
      case TELQUAL_IS:
          output_data("IS \"%.*s\"",
                  length-2,
                  (char *)pointer+2);
          break;
      case TELQUAL_SEND:
          output_data("SEND");
          break;
      default:
          output_data("- unknown qualifier %d (0x%x).",
                  pointer[1], pointer[1]);
      }
      break;
    case TELOPT_TSPEED:
      output_data("TERMINAL-SPEED");
      if (length < 2) {
          output_data(" (empty suboption??\?)");
          break;
      }
      switch (pointer[1]) {
      case TELQUAL_IS:
          output_data(" IS %.*s", length-2, (char *)pointer+2);
          break;
      default:
          if (pointer[1] == 1)
            output_data(" SEND");
          else
            output_data(" %d (unknown)", pointer[1]);
          for (i = 2; i < length; i++) {
            output_data(" ?%d?", pointer[i]);
          }
          break;
      }
      break;

    case TELOPT_LFLOW:
      output_data("TOGGLE-FLOW-CONTROL");
      if (length < 2) {
          output_data(" (empty suboption??\?)");
          break;
      }
      switch (pointer[1]) {
      case LFLOW_OFF:
          output_data(" OFF");
          break;
      case LFLOW_ON:
          output_data(" ON");
          break;
      case LFLOW_RESTART_ANY:
          output_data(" RESTART-ANY");
          break;
      case LFLOW_RESTART_XON:
          output_data(" RESTART-XON");
          break;
      default:
          output_data(" %d (unknown)",
                  pointer[1]);
      }
      for (i = 2; i < length; i++) {
          output_data(" ?%d?",
                  pointer[i]);
      }
      break;

    case TELOPT_NAWS:
      output_data("NAWS");
      if (length < 2) {
          output_data(" (empty suboption??\?)");
          break;
      }
      if (length == 2) {
          output_data(" ?%d?",
                  pointer[1]);
          break;
      }
      output_data(" %u %u(%u)",
                pointer[1],
                pointer[2],
                (((unsigned int)pointer[1])<<8) + pointer[2]);
      if (length == 4) {
          output_data(" ?%d?",
                  pointer[3]);
          break;
      }
      output_data(" %u %u(%u)",
                pointer[3],
                pointer[4],
                (((unsigned int)pointer[3])<<8) + pointer[4]);
      for (i = 5; i < length; i++) {
          output_data(" ?%d?",
                  pointer[i]);
      }
      break;

    case TELOPT_LINEMODE:
      output_data("LINEMODE ");
      if (length < 2) {
          output_data(" (empty suboption??\?)");
          break;
      }
      switch (pointer[1]) {
      case WILL:
          output_data("WILL ");
          goto common;
      case WONT:
          output_data("WONT ");
          goto common;
      case DO:
          output_data("DO ");
          goto common;
      case DONT:
          output_data("DONT ");
      common:
          if (length < 3) {
            output_data("(no option??\?)");
            break;
          }
          switch (pointer[2]) {
          case LM_FORWARDMASK:
            output_data("Forward Mask");
            for (i = 3; i < length; i++) {
                output_data(" %x", pointer[i]);
            }
            break;
          default:
            output_data("%d (unknown)",
                      pointer[2]);
            for (i = 3; i < length; i++) {
                output_data(" %d",
                        pointer[i]);
            }
            break;
          }
          break;

      case LM_SLC:
          output_data("SLC");
          for (i = 2; i < length - 2; i += 3) {
            if (SLC_NAME_OK(pointer[i+SLC_FUNC]))
                output_data(" %s",
                        SLC_NAME(pointer[i+SLC_FUNC]));
            else
                output_data(" %d",
                        pointer[i+SLC_FUNC]);
            switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
            case SLC_NOSUPPORT:
                output_data(" NOSUPPORT");
                break;
            case SLC_CANTCHANGE:
                output_data(" CANTCHANGE");
                break;
            case SLC_VARIABLE:
                output_data(" VARIABLE");
                break;
            case SLC_DEFAULT:
                output_data(" DEFAULT");
                break;
            }
            output_data("%s%s%s",
                      pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
                      pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
                      pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
            if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
                                  SLC_FLUSHOUT| SLC_LEVELBITS)) {
                output_data("(0x%x)",
                        pointer[i+SLC_FLAGS]);
            }
            output_data(" %d;",
                      pointer[i+SLC_VALUE]);
            if ((pointer[i+SLC_VALUE] == IAC) &&
                (pointer[i+SLC_VALUE+1] == IAC))
                i++;
          }
          for (; i < length; i++) {
            output_data(" ?%d?",
                      pointer[i]);
          }
          break;

      case LM_MODE:
          output_data("MODE ");
          if (length < 3) {
            output_data("(no mode??\?)");
            break;
          }
          {
            char tbuf[32];
            snprintf(tbuf,
                   sizeof(tbuf),
                   "%s%s%s%s%s",
                   pointer[2]&MODE_EDIT ? "|EDIT" : "",
                   pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
                   pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
                   pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
                   pointer[2]&MODE_ACK ? "|ACK" : "");
            output_data("%s",
                      tbuf[1] ? &tbuf[1] : "0");
          }
          if (pointer[2]&~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK)) {
            output_data(" (0x%x)",
                      pointer[2]);
          }
          for (i = 3; i < length; i++) {
            output_data(" ?0x%x?",
                   pointer[i]);
          }
          break;
      default:
          output_data("%d (unknown)",
                  pointer[1]);
          for (i = 2; i < length; i++) {
            output_data(" %d", pointer[i]);
          }
      }
      break;

    case TELOPT_STATUS: {
      char *cp;
      int j, k;

      output_data("STATUS");

      switch (pointer[1]) {
      default:
          if (pointer[1] == TELQUAL_SEND)
            output_data(" SEND");
          else
            output_data(" %d (unknown)",
                      pointer[1]);
          for (i = 2; i < length; i++) {
            output_data(" ?%d?",
                      pointer[i]);
          }
          break;
      case TELQUAL_IS:
          output_data(" IS\r\n");

          for (i = 2; i < length; i++) {
            switch(pointer[i]) {
            case DO:    cp = "DO"; goto common2;
            case DONT:  cp = "DONT"; goto common2;
            case WILL:  cp = "WILL"; goto common2;
            case WONT:  cp = "WONT"; goto common2;
            common2:
            i++;
            if (TELOPT_OK(pointer[i]))
                output_data(" %s %s",
                        cp,
                        TELOPT(pointer[i]));
            else
                output_data(" %s %d",
                        cp,
                        pointer[i]);

            output_data("\r\n");
            break;

            case SB:
                output_data(" SB ");
                i++;
                j = k = i;
                while (j < length) {
                  if (pointer[j] == SE) {
                      if (j+1 == length)
                        break;
                      if (pointer[j+1] == SE)
                        j++;
                      else
                        break;
                  }
                  pointer[k++] = pointer[j++];
                }
                printsub(0, &pointer[i], k - i);
                if (i < length) {
                  output_data(" SE");
                  i = j;
                } else
                  i = j - 1;

                output_data("\r\n");

                break;

            default:
                output_data(" %d",
                        pointer[i]);
                break;
            }
          }
          break;
      }
      break;
    }

    case TELOPT_XDISPLOC:
      output_data("X-DISPLAY-LOCATION ");
      switch (pointer[1]) {
      case TELQUAL_IS:
          output_data("IS \"%.*s\"",
                  length-2,
                  (char *)pointer+2);
          break;
      case TELQUAL_SEND:
          output_data("SEND");
          break;
      default:
          output_data("- unknown qualifier %d (0x%x).",
                  pointer[1], pointer[1]);
      }
      break;

    case TELOPT_NEW_ENVIRON:
      output_data("NEW-ENVIRON ");
      goto env_common1;
    case TELOPT_OLD_ENVIRON:
      output_data("OLD-ENVIRON");
    env_common1:
      switch (pointer[1]) {
      case TELQUAL_IS:
          output_data("IS ");
          goto env_common;
      case TELQUAL_SEND:
          output_data("SEND ");
          goto env_common;
      case TELQUAL_INFO:
          output_data("INFO ");
      env_common:
          {
            int noquote = 2;
            for (i = 2; i < length; i++ ) {
                switch (pointer[i]) {
                case NEW_ENV_VAR:
                  output_data("\" VAR " + noquote);
                  noquote = 2;
                  break;

                case NEW_ENV_VALUE:
                  output_data("\" VALUE " + noquote);
                  noquote = 2;
                  break;

                case ENV_ESC:
                  output_data("\" ESC " + noquote);
                  noquote = 2;
                  break;

                case ENV_USERVAR:
                  output_data("\" USERVAR " + noquote);
                  noquote = 2;
                  break;

                default:
                  if (isprint(pointer[i]) && pointer[i] != '"') {
                      if (noquote) {
                        output_data ("\"");
                        noquote = 0;
                      }
                      output_data ("%c", pointer[i]);
                  } else {
                      output_data("\" %03o " + noquote,
                              pointer[i]);
                      noquote = 2;
                  }
                  break;
                }
            }
            if (!noquote)
                output_data ("\"");
            break;
          }
      }
      break;

#ifdef AUTHENTICATION
    case TELOPT_AUTHENTICATION:
      output_data("AUTHENTICATION");

      if (length < 2) {
          output_data(" (empty suboption??\?)");
          break;
      }
      switch (pointer[1]) {
      case TELQUAL_REPLY:
      case TELQUAL_IS:
          output_data(" %s ",
                  (pointer[1] == TELQUAL_IS) ?
                  "IS" : "REPLY");
          if (AUTHTYPE_NAME_OK(pointer[2]))
            output_data("%s ",
                      AUTHTYPE_NAME(pointer[2]));
          else
            output_data("%d ",
                      pointer[2]);
          if (length < 3) {
            output_data("(partial suboption??\?)");
            break;
          }
          output_data("%s|%s",
                  ((pointer[3] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
                  "CLIENT" : "SERVER",
                  ((pointer[3] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
                  "MUTUAL" : "ONE-WAY");

          auth_printsub(&pointer[1], length - 1, buf, sizeof(buf));
          output_data("%s",
                  buf);
          break;

      case TELQUAL_SEND:
          i = 2;
          output_data(" SEND ");
          while (i < length) {
            if (AUTHTYPE_NAME_OK(pointer[i]))
                output_data("%s ",
                        AUTHTYPE_NAME(pointer[i]));
            else
                output_data("%d ",
                        pointer[i]);
            if (++i >= length) {
                output_data("(partial suboption??\?)");
                break;
            }
            output_data("%s|%s ",
                      ((pointer[i] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
                      "CLIENT" : "SERVER",
                      ((pointer[i] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
                      "MUTUAL" : "ONE-WAY");
            ++i;
          }
          break;

      case TELQUAL_NAME:
          i = 2;
          output_data(" NAME \"%.*s\"",
                  length - 2,
                  pointer);
          break;

      default:
          for (i = 2; i < length; i++) {
            output_data(" ?%d?",
                      pointer[i]);
          }
          break;
      }
      break;
#endif

#ifdef ENCRYPTION
    case TELOPT_ENCRYPT:
      output_data("ENCRYPT");
      if (length < 2) {
          output_data(" (empty suboption?)");
          break;
      }
      switch (pointer[1]) {
      case ENCRYPT_START:
          output_data(" START");
          break;

      case ENCRYPT_END:
          output_data(" END");
          break;

      case ENCRYPT_REQSTART:
          output_data(" REQUEST-START");
          break;

      case ENCRYPT_REQEND:
          output_data(" REQUEST-END");
          break;

      case ENCRYPT_IS:
      case ENCRYPT_REPLY:
          output_data(" %s ",
                  (pointer[1] == ENCRYPT_IS) ?
                  "IS" : "REPLY");
          if (length < 3) {
            output_data(" (partial suboption?)");
            break;
          }
          if (ENCTYPE_NAME_OK(pointer[2]))
            output_data("%s ",
                      ENCTYPE_NAME(pointer[2]));
          else
            output_data(" %d (unknown)",
                      pointer[2]);

          encrypt_printsub(&pointer[1], length - 1, buf, sizeof(buf));
          output_data("%s",
                  buf);
          break;

      case ENCRYPT_SUPPORT:
          i = 2;
          output_data(" SUPPORT ");
          while (i < length) {
            if (ENCTYPE_NAME_OK(pointer[i]))
                output_data("%s ",
                        ENCTYPE_NAME(pointer[i]));
            else
                output_data("%d ",
                        pointer[i]);
            i++;
          }
          break;

      case ENCRYPT_ENC_KEYID:
          output_data(" ENC_KEYID %d", pointer[1]);
          goto encommon;

      case ENCRYPT_DEC_KEYID:
          output_data(" DEC_KEYID %d", pointer[1]);
          goto encommon;

      default:
          output_data(" %d (unknown)", pointer[1]);
      encommon:
          for (i = 2; i < length; i++) {
            output_data(" %d", pointer[i]);
          }
          break;
      }
      break;
#endif

    default:
      if (TELOPT_OK(pointer[0]))
          output_data("%s (unknown)",
                  TELOPT(pointer[0]));
      else
          output_data("%d (unknown)",
                  pointer[i]);
      for (i = 1; i < length; i++) {
          output_data(" %d", pointer[i]);
      }
      break;
    }
    output_data("\r\n");
}

/*
 * Dump a data buffer in hex and ascii to the output data stream.
 */
void
printdata(char *tag, char *ptr, int cnt)
{
    int i;
    char xbuf[30];

    while (cnt) {
      /* flush net output buffer if no room for new data) */
      if ((&netobuf[BUFSIZ] - nfrontp) < 80) {
          netflush();
      }

      /* add a line of output */
      output_data("%s: ", tag);
      for (i = 0; i < 20 && cnt; i++) {
          output_data("%02x", *ptr);
          if (isprint((unsigned char)*ptr)) {
            xbuf[i] = *ptr;
          } else {
            xbuf[i] = '.';
          }
          if (i % 2) {
            output_data(" ");
          }
          cnt--;
          ptr++;
      }
      xbuf[i] = '\0';
      output_data(" %s\r\n", xbuf);
    }
}
#endif /* DIAGNOSTICS */

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