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commands.c

/*
 * Copyright (c) 1988, 1990, 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 "telnet_locl.h"

RCSID("$Id: commands.c,v 1.72 2002/08/28 21:04:59 joda Exp $");

#if   defined(IPPROTO_IP) && defined(IP_TOS)
int tos = -1;
#endif      /* defined(IPPROTO_IP) && defined(IP_TOS) */

char  *hostname;
static char _hostname[MaxHostNameLen];

typedef int (*intrtn_t)(int, char**);
static int call(intrtn_t, ...);

typedef struct {
      char  *name;            /* command name */
      char  *help;            /* help string (NULL for no help) */
      int   (*handler)();     /* routine which executes command */
      int   needconnect;      /* Do we need to be connected to execute? */
} Command;

static char line[256];
static char saveline[256];
static int margc;
static char *margv[20];

static void
makeargv()
{
    char *cp, *cp2, c;
    char **argp = margv;

    margc = 0;
    cp = line;
    if (*cp == '!') {         /* Special case shell escape */
      /* save for shell command */
      strlcpy(saveline, line, sizeof(saveline));
      *argp++ = "!";          /* No room in string to get this */
      margc++;
      cp++;
    }
    while ((c = *cp)) {
      int inquote = 0;
      while (isspace(c))
          c = *++cp;
      if (c == '\0')
          break;
      *argp++ = cp;
      margc += 1;
      for (cp2 = cp; c != '\0'; c = *++cp) {
          if (inquote) {
            if (c == inquote) {
                inquote = 0;
                continue;
            }
          } else {
            if (c == '\\') {
                if ((c = *++cp) == '\0')
                  break;
            } else if (c == '"') {
                inquote = '"';
                continue;
            } else if (c == '\'') {
                inquote = '\'';
                continue;
            } else if (isspace(c))
                break;
          }
          *cp2++ = c;
      }
      *cp2 = '\0';
      if (c == '\0')
          break;
      cp++;
    }
    *argp++ = 0;
}

/*
 * Make a character string into a number.
 *
 * Todo:  1.  Could take random integers (12, 0x12, 012, 0b1).
 */

static char
special(char *s)
{
      char c;
      char b;

      switch (*s) {
      case '^':
            b = *++s;
            if (b == '?') {
                c = b | 0x40;       /* DEL */
            } else {
                c = b & 0x1f;
            }
            break;
      default:
            c = *s;
            break;
      }
      return c;
}

/*
 * Construct a control character sequence
 * for a special character.
 */
static char *
control(cc_t c)
{
      static char buf[5];
      /*
       * The only way I could get the Sun 3.5 compiler
       * to shut up about
       *    if ((unsigned int)c >= 0x80)
       * was to assign "c" to an unsigned int variable...
       * Arggg....
       */
      unsigned int uic = (unsigned int)c;

      if (uic == 0x7f)
            return ("^?");
      if (c == (cc_t)_POSIX_VDISABLE) {
            return "off";
      }
      if (uic >= 0x80) {
            buf[0] = '\\';
            buf[1] = ((c>>6)&07) + '0';
            buf[2] = ((c>>3)&07) + '0';
            buf[3] = (c&07) + '0';
            buf[4] = 0;
      } else if (uic >= 0x20) {
            buf[0] = c;
            buf[1] = 0;
      } else {
            buf[0] = '^';
            buf[1] = '@'+c;
            buf[2] = 0;
      }
      return (buf);
}



/*
 *    The following are data structures and routines for
 *    the "send" command.
 *
 */

struct sendlist {
    char    *name;            /* How user refers to it (case independent) */
    char    *help;            /* Help information (0 ==> no help) */
    int           needconnect;      /* Need to be connected */
    int           narg;       /* Number of arguments */
    int           (*handler)();     /* Routine to perform (for special ops) */
    int           nbyte;            /* Number of bytes to send this command */
    int           what;       /* Character to be sent (<0 ==> special) */
};


static int
      send_esc (void),
      send_help (void),
      send_docmd (char *),
      send_dontcmd (char *),
      send_willcmd (char *),
      send_wontcmd (char *);

static struct sendlist Sendlist[] = {
    { "ao", "Send Telnet Abort output",         1, 0, 0, 2, AO },
    { "ayt",      "Send Telnet 'Are You There'",            1, 0, 0, 2, AYT },
    { "brk",      "Send Telnet Break",                1, 0, 0, 2, BREAK },
    { "break",    0,                            1, 0, 0, 2, BREAK },
    { "ec", "Send Telnet Erase Character",            1, 0, 0, 2, EC },
    { "el", "Send Telnet Erase Line",           1, 0, 0, 2, EL },
    { "escape",   "Send current escape character",    1, 0, send_esc, 1, 0 },
    { "ga", "Send Telnet 'Go Ahead' sequence",  1, 0, 0, 2, GA },
    { "ip", "Send Telnet Interrupt Process",    1, 0, 0, 2, IP },
    { "intp",     0,                            1, 0, 0, 2, IP },
    { "interrupt", 0,                           1, 0, 0, 2, IP },
    { "intr",     0,                            1, 0, 0, 2, IP },
    { "nop",      "Send Telnet 'No operation'",       1, 0, 0, 2, NOP },
    { "eor",      "Send Telnet 'End of Record'",            1, 0, 0, 2, EOR },
    { "abort",    "Send Telnet 'Abort Process'",            1, 0, 0, 2, ABORT },
    { "susp",     "Send Telnet 'Suspend Process'",    1, 0, 0, 2, SUSP },
    { "eof",      "Send Telnet End of File Character",      1, 0, 0, 2, xEOF },
    { "synch",    "Perform Telnet 'Synch operation'", 1, 0, dosynch, 2, 0 },
    { "getstatus", "Send request for STATUS",         1, 0, get_status, 6, 0 },
    { "?",  "Display send options",             0, 0, send_help, 0, 0 },
    { "help",     0,                            0, 0, send_help, 0, 0 },
    { "do", 0,                            0, 1, send_docmd, 3, 0 },
    { "dont",     0,                            0, 1, send_dontcmd, 3, 0 },
    { "will",     0,                            0, 1, send_willcmd, 3, 0 },
    { "wont",     0,                            0, 1, send_wontcmd, 3, 0 },
    { 0 }
};

#define     GETSEND(name) ((struct sendlist *) genget(name, (char **) Sendlist, \
                        sizeof(struct sendlist)))

static int
sendcmd(int argc, char **argv)
{
    int count;          /* how many bytes we are going to need to send */
    int i;
    struct sendlist *s; /* pointer to current command */
    int success = 0;
    int needconnect = 0;

    if (argc < 2) {
      printf("need at least one argument for 'send' command\r\n");
      printf("'send ?' for help\r\n");
      return 0;
    }
    /*
     * First, validate all the send arguments.
     * In addition, we see how much space we are going to need, and
     * whether or not we will be doing a "SYNCH" operation (which
     * flushes the network queue).
     */
    count = 0;
    for (i = 1; i < argc; i++) {
      s = GETSEND(argv[i]);
      if (s == 0) {
          printf("Unknown send argument '%s'\r\n'send ?' for help.\r\n",
                  argv[i]);
          return 0;
      } else if (Ambiguous(s)) {
          printf("Ambiguous send argument '%s'\r\n'send ?' for help.\r\n",
                  argv[i]);
          return 0;
      }
      if (i + s->narg >= argc) {
          fprintf(stderr,
          "Need %d argument%s to 'send %s' command.  'send %s ?' for help.\r\n",
            s->narg, s->narg == 1 ? "" : "s", s->name, s->name);
          return 0;
      }
      count += s->nbyte;
      if (s->handler == send_help) {
          send_help();
          return 0;
      }

      i += s->narg;
      needconnect += s->needconnect;
    }
    if (!connected && needconnect) {
      printf("?Need to be connected first.\r\n");
      printf("'send ?' for help\r\n");
      return 0;
    }
    /* Now, do we have enough room? */
    if (NETROOM() < count) {
      printf("There is not enough room in the buffer TO the network\r\n");
      printf("to process your request.  Nothing will be done.\r\n");
      printf("('send synch' will throw away most data in the network\r\n");
      printf("buffer, if this might help.)\r\n");
      return 0;
    }
    /* OK, they are all OK, now go through again and actually send */
    count = 0;
    for (i = 1; i < argc; i++) {
      if ((s = GETSEND(argv[i])) == 0) {
          fprintf(stderr, "Telnet 'send' error - argument disappeared!\r\n");
          quit();
          /*NOTREACHED*/
      }
      if (s->handler) {
          count++;
          success += (*s->handler)((s->narg > 0) ? argv[i+1] : 0,
                          (s->narg > 1) ? argv[i+2] : 0);
          i += s->narg;
      } else {
          NET2ADD(IAC, s->what);
          printoption("SENT", IAC, s->what);
      }
    }
    return (count == success);
}

static int
send_tncmd(void (*func)(), char *cmd, char *name);

static int
send_esc()
{
    NETADD(escape);
    return 1;
}

static int
send_docmd(char *name)
{
    return(send_tncmd(send_do, "do", name));
}

static int
send_dontcmd(char *name)
{
    return(send_tncmd(send_dont, "dont", name));
}

static int
send_willcmd(char *name)
{
    return(send_tncmd(send_will, "will", name));
}

static int
send_wontcmd(char *name)
{
    return(send_tncmd(send_wont, "wont", name));
}

extern char *telopts[];       /* XXX */

static int
send_tncmd(void (*func)(), char *cmd, char *name)
{
    char **cpp;
    int val = 0;

    if (isprefix(name, "help") || isprefix(name, "?")) {
      int col, len;

      printf("Usage: send %s <value|option>\r\n", cmd);
      printf("\"value\" must be from 0 to 255\r\n");
      printf("Valid options are:\r\n\t");

      col = 8;
      for (cpp = telopts; *cpp; cpp++) {
          len = strlen(*cpp) + 3;
          if (col + len > 65) {
            printf("\r\n\t");
            col = 8;
          }
          printf(" \"%s\"", *cpp);
          col += len;
      }
      printf("\r\n");
      return 0;
    }
    cpp = genget(name, telopts, sizeof(char *));
    if (Ambiguous(cpp)) {
      fprintf(stderr,"'%s': ambiguous argument ('send %s ?' for help).\r\n",
                              name, cmd);
      return 0;
    }
    if (cpp) {
      val = cpp - telopts;
    } else {
      char *cp = name;

      while (*cp >= '0' && *cp <= '9') {
          val *= 10;
          val += *cp - '0';
          cp++;
      }
      if (*cp != 0) {
          fprintf(stderr, "'%s': unknown argument ('send %s ?' for help).\r\n",
                              name, cmd);
          return 0;
      } else if (val < 0 || val > 255) {
          fprintf(stderr, "'%s': bad value ('send %s ?' for help).\r\n",
                              name, cmd);
          return 0;
      }
    }
    if (!connected) {
      printf("?Need to be connected first.\r\n");
      return 0;
    }
    (*func)(val, 1);
    return 1;
}

static int
send_help()
{
    struct sendlist *s; /* pointer to current command */
    for (s = Sendlist; s->name; s++) {
      if (s->help)
          printf("%-15s %s\r\n", s->name, s->help);
    }
    return(0);
}

/*
 * The following are the routines and data structures referred
 * to by the arguments to the "toggle" command.
 */

static int
lclchars()
{
    donelclchars = 1;
    return 1;
}

static int
togdebug()
{
#ifndef     NOT43
    if (net > 0 &&
      (SetSockOpt(net, SOL_SOCKET, SO_DEBUG, debug)) < 0) {
          perror("setsockopt (SO_DEBUG)");
    }
#else /* NOT43 */
    if (debug) {
      if (net > 0 && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 0, 0) < 0)
          perror("setsockopt (SO_DEBUG)");
    } else
      printf("Cannot turn off socket debugging\r\n");
#endif      /* NOT43 */
    return 1;
}

#if defined(KRB4) && defined(HAVE_KRB_DISABLE_DEBUG)
#include <krb.h>

static int
togkrbdebug(void)
{
    if(krb_debug)
      krb_enable_debug();
    else
      krb_disable_debug();
    return 1;
}
#endif

static int
togcrlf()
{
    if (crlf) {
      printf("Will send carriage returns as telnet <CR><LF>.\r\n");
    } else {
      printf("Will send carriage returns as telnet <CR><NUL>.\r\n");
    }
    return 1;
}

int binmode;

static int
togbinary(int val)
{
    donebinarytoggle = 1;

    if (val >= 0) {
      binmode = val;
    } else {
      if (my_want_state_is_will(TELOPT_BINARY) &&
                        my_want_state_is_do(TELOPT_BINARY)) {
          binmode = 1;
      } else if (my_want_state_is_wont(TELOPT_BINARY) &&
                        my_want_state_is_dont(TELOPT_BINARY)) {
          binmode = 0;
      }
      val = binmode ? 0 : 1;
    }

    if (val == 1) {
      if (my_want_state_is_will(TELOPT_BINARY) &&
                              my_want_state_is_do(TELOPT_BINARY)) {
          printf("Already operating in binary mode with remote host.\r\n");
      } else {
          printf("Negotiating binary mode with remote host.\r\n");
          tel_enter_binary(3);
      }
    } else {
      if (my_want_state_is_wont(TELOPT_BINARY) &&
                              my_want_state_is_dont(TELOPT_BINARY)) {
          printf("Already in network ascii mode with remote host.\r\n");
      } else {
          printf("Negotiating network ascii mode with remote host.\r\n");
          tel_leave_binary(3);
      }
    }
    return 1;
}

static int
togrbinary(int val)
{
    donebinarytoggle = 1;

    if (val == -1)
      val = my_want_state_is_do(TELOPT_BINARY) ? 0 : 1;

    if (val == 1) {
      if (my_want_state_is_do(TELOPT_BINARY)) {
          printf("Already receiving in binary mode.\r\n");
      } else {
          printf("Negotiating binary mode on input.\r\n");
          tel_enter_binary(1);
      }
    } else {
      if (my_want_state_is_dont(TELOPT_BINARY)) {
          printf("Already receiving in network ascii mode.\r\n");
      } else {
          printf("Negotiating network ascii mode on input.\r\n");
          tel_leave_binary(1);
      }
    }
    return 1;
}

static int
togxbinary(int val)
{
    donebinarytoggle = 1;

    if (val == -1)
      val = my_want_state_is_will(TELOPT_BINARY) ? 0 : 1;

    if (val == 1) {
      if (my_want_state_is_will(TELOPT_BINARY)) {
          printf("Already transmitting in binary mode.\r\n");
      } else {
          printf("Negotiating binary mode on output.\r\n");
          tel_enter_binary(2);
      }
    } else {
      if (my_want_state_is_wont(TELOPT_BINARY)) {
          printf("Already transmitting in network ascii mode.\r\n");
      } else {
          printf("Negotiating network ascii mode on output.\r\n");
          tel_leave_binary(2);
      }
    }
    return 1;
}


static int togglehelp (void);
#if   defined(AUTHENTICATION)
extern int auth_togdebug (int);
#endif
#if   defined(ENCRYPTION)
extern int EncryptAutoEnc (int);
extern int EncryptAutoDec (int);
extern int EncryptDebug (int);
extern int EncryptVerbose (int);
#endif

struct togglelist {
    char    *name;            /* name of toggle */
    char    *help;            /* help message */
    int           (*handler)();     /* routine to do actual setting */
    int           *variable;
    char    *actionexplanation;
};

static struct togglelist Togglelist[] = {
    { "autoflush",
      "flushing of output when sending interrupt characters",
          0,
            &autoflush,
                "flush output when sending interrupt characters" },
    { "autosynch",
      "automatic sending of interrupt characters in urgent mode",
          0,
            &autosynch,
                "send interrupt characters in urgent mode" },
#if   defined(AUTHENTICATION)
    { "autologin",
      "automatic sending of login and/or authentication info",
          0,
            &autologin,
                "send login name and/or authentication information" },
    { "authdebug",
      "authentication debugging",
          auth_togdebug,
            0,
                 "print authentication debugging information" },
#endif
#if   defined(ENCRYPTION)
    { "autoencrypt",
      "automatic encryption of data stream",
          EncryptAutoEnc,
            0,
                "automatically encrypt output" },
    { "autodecrypt",
      "automatic decryption of data stream",
          EncryptAutoDec,
            0,
                "automatically decrypt input" },
    { "verbose_encrypt",
      "verbose encryption output",
          EncryptVerbose,
            0,
                "print verbose encryption output" },
    { "encdebug",
      "encryption debugging",
          EncryptDebug,
            0,
                "print encryption debugging information" },
#endif
#if defined(KRB5)
    { "forward",
      "credentials forwarding",
          kerberos5_set_forward,
            0,
                "forward credentials" },
    { "forwardable",
      "forwardable flag of forwarded credentials",
          kerberos5_set_forwardable,
            0,
                "forward forwardable credentials" },
#endif
   { "skiprc",
      "don't read ~/.telnetrc file",
          0,
            &skiprc,
                "skip reading of ~/.telnetrc file" },
    { "binary",
      "sending and receiving of binary data",
          togbinary,
            0,
                0 },
    { "inbinary",
      "receiving of binary data",
          togrbinary,
            0,
                0 },
    { "outbinary",
      "sending of binary data",
          togxbinary,
            0,
                0 },
    { "crlf",
      "sending carriage returns as telnet <CR><LF>",
          togcrlf,
            &crlf,
                0 },
    { "crmod",
      "mapping of received carriage returns",
          0,
            &crmod,
                "map carriage return on output" },
    { "localchars",
      "local recognition of certain control characters",
          lclchars,
            &localchars,
                "recognize certain control characters" },
    { " ", "", 0 },           /* empty line */
    { "debug",
      "debugging",
          togdebug,
            &debug,
                "turn on socket level debugging" },
#if defined(KRB4) && defined(HAVE_KRB_DISABLE_DEBUG)
    { "krb_debug",
      "kerberos 4 debugging",
      togkrbdebug,
      &krb_debug,
      "turn on kerberos 4 debugging" },
#endif
    { "netdata",
      "printing of hexadecimal network data (debugging)",
          0,
            &netdata,
                "print hexadecimal representation of network traffic" },
    { "prettydump",
      "output of \"netdata\" to user readable format (debugging)",
          0,
            &prettydump,
                "print user readable output for \"netdata\"" },
    { "options",
      "viewing of options processing (debugging)",
          0,
            &showoptions,
                "show option processing" },
    { "termdata",
      "printing of hexadecimal terminal data (debugging)",
          0,
            &termdata,
                "print hexadecimal representation of terminal traffic" },
    { "?",
      0,
          togglehelp },
    { "help",
      0,
          togglehelp },
    { 0 }
};

static int
togglehelp()
{
    struct togglelist *c;

    for (c = Togglelist; c->name; c++) {
      if (c->help) {
          if (*c->help)
            printf("%-15s toggle %s\r\n", c->name, c->help);
          else
            printf("\r\n");
      }
    }
    printf("\r\n");
    printf("%-15s %s\r\n", "?", "display help information");
    return 0;
}

static void
settogglehelp(int set)
{
    struct togglelist *c;

    for (c = Togglelist; c->name; c++) {
      if (c->help) {
          if (*c->help)
            printf("%-15s %s %s\r\n", c->name, set ? "enable" : "disable",
                                    c->help);
          else
            printf("\r\n");
      }
    }
}

#define     GETTOGGLE(name) (struct togglelist *) \
            genget(name, (char **) Togglelist, sizeof(struct togglelist))

static int
toggle(int argc, char *argv[])
{
    int retval = 1;
    char *name;
    struct togglelist *c;

    if (argc < 2) {
      fprintf(stderr,
          "Need an argument to 'toggle' command.  'toggle ?' for help.\r\n");
      return 0;
    }
    argc--;
    argv++;
    while (argc--) {
      name = *argv++;
      c = GETTOGGLE(name);
      if (Ambiguous(c)) {
          fprintf(stderr, "'%s': ambiguous argument ('toggle ?' for help).\r\n",
                              name);
          return 0;
      } else if (c == 0) {
          fprintf(stderr, "'%s': unknown argument ('toggle ?' for help).\r\n",
                              name);
          return 0;
      } else {
          if (c->variable) {
            *c->variable = !*c->variable;       /* invert it */
            if (c->actionexplanation) {
                printf("%s %s.\r\n", *c->variable? "Will" : "Won't",
                                          c->actionexplanation);
            }
          }
          if (c->handler) {
            retval &= (*c->handler)(-1);
          }
      }
    }
    return retval;
}

/*
 * The following perform the "set" command.
 */

struct termios new_tc = { 0 };

struct setlist {
    char *name;                     /* name */
    char *help;                     /* help information */
    void (*handler)();
    cc_t *charp;              /* where it is located at */
};

static struct setlist Setlist[] = {
#ifdef      KLUDGELINEMODE
    { "echo",     "character to toggle local echoing on/off", 0, &echoc },
#endif
    { "escape",   "character to escape back to telnet command mode", 0, &escape },
    { "rlogin", "rlogin escape character", 0, &rlogin },
    { "tracefile", "file to write trace information to", SetNetTrace, (cc_t *)NetTraceFile},
    { " ", "" },
    { " ", "The following need 'localchars' to be toggled true", 0, 0 },
    { "flushoutput", "character to cause an Abort Output", 0, &termFlushChar },
    { "interrupt", "character to cause an Interrupt Process", 0, &termIntChar },
    { "quit",     "character to cause an Abort process", 0, &termQuitChar },
    { "eof",      "character to cause an EOF ", 0, &termEofChar },
    { " ", "" },
    { " ", "The following are for local editing in linemode", 0, 0 },
    { "erase",    "character to use to erase a character", 0, &termEraseChar },
    { "kill",     "character to use to erase a line", 0, &termKillChar },
    { "lnext",    "character to use for literal next", 0, &termLiteralNextChar },
    { "susp",     "character to cause a Suspend Process", 0, &termSuspChar },
    { "reprint", "character to use for line reprint", 0, &termRprntChar },
    { "worderase", "character to use to erase a word", 0, &termWerasChar },
    { "start",    "character to use for XON", 0, &termStartChar },
    { "stop",     "character to use for XOFF", 0, &termStopChar },
    { "forw1",    "alternate end of line character", 0, &termForw1Char },
    { "forw2",    "alternate end of line character", 0, &termForw2Char },
    { "ayt",      "alternate AYT character", 0, &termAytChar },
    { 0 }
};

static struct setlist *
getset(char *name)
{
    return (struct setlist *)
            genget(name, (char **) Setlist, sizeof(struct setlist));
}

void
set_escape_char(char *s)
{
      if (rlogin != _POSIX_VDISABLE) {
            rlogin = (s && *s) ? special(s) : _POSIX_VDISABLE;
            printf("Telnet rlogin escape character is '%s'.\r\n",
                              control(rlogin));
      } else {
            escape = (s && *s) ? special(s) : _POSIX_VDISABLE;
            printf("Telnet escape character is '%s'.\r\n", control(escape));
      }
}

static int
setcmd(int argc, char *argv[])
{
    int value;
    struct setlist *ct;
    struct togglelist *c;

    if (argc < 2 || argc > 3) {
      printf("Format is 'set Name Value'\r\n'set ?' for help.\r\n");
      return 0;
    }
    if ((argc == 2) && (isprefix(argv[1], "?") || isprefix(argv[1], "help"))) {
      for (ct = Setlist; ct->name; ct++)
          printf("%-15s %s\r\n", ct->name, ct->help);
      printf("\r\n");
      settogglehelp(1);
      printf("%-15s %s\r\n", "?", "display help information");
      return 0;
    }

    ct = getset(argv[1]);
    if (ct == 0) {
      c = GETTOGGLE(argv[1]);
      if (c == 0) {
          fprintf(stderr, "'%s': unknown argument ('set ?' for help).\r\n",
                  argv[1]);
          return 0;
      } else if (Ambiguous(c)) {
          fprintf(stderr, "'%s': ambiguous argument ('set ?' for help).\r\n",
                  argv[1]);
          return 0;
      }
      if (c->variable) {
          if ((argc == 2) || (strcmp("on", argv[2]) == 0))
            *c->variable = 1;
          else if (strcmp("off", argv[2]) == 0)
            *c->variable = 0;
          else {
            printf("Format is 'set togglename [on|off]'\r\n'set ?' for help.\r\n");
            return 0;
          }
          if (c->actionexplanation) {
            printf("%s %s.\r\n", *c->variable? "Will" : "Won't",
                                          c->actionexplanation);
          }
      }
      if (c->handler)
          (*c->handler)(1);
    } else if (argc != 3) {
      printf("Format is 'set Name Value'\r\n'set ?' for help.\r\n");
      return 0;
    } else if (Ambiguous(ct)) {
      fprintf(stderr, "'%s': ambiguous argument ('set ?' for help).\r\n",
                  argv[1]);
      return 0;
    } else if (ct->handler) {
      (*ct->handler)(argv[2]);
      printf("%s set to \"%s\".\r\n", ct->name, (char *)ct->charp);
    } else {
      if (strcmp("off", argv[2])) {
          value = special(argv[2]);
      } else {
          value = _POSIX_VDISABLE;
      }
      *(ct->charp) = (cc_t)value;
      printf("%s character is '%s'.\r\n", ct->name, control(*(ct->charp)));
    }
    slc_check();
    return 1;
}

static int
unsetcmd(int argc, char *argv[])
{
    struct setlist *ct;
    struct togglelist *c;
    char *name;

    if (argc < 2) {
      fprintf(stderr,
          "Need an argument to 'unset' command.  'unset ?' for help.\r\n");
      return 0;
    }
    if (isprefix(argv[1], "?") || isprefix(argv[1], "help")) {
      for (ct = Setlist; ct->name; ct++)
          printf("%-15s %s\r\n", ct->name, ct->help);
      printf("\r\n");
      settogglehelp(0);
      printf("%-15s %s\r\n", "?", "display help information");
      return 0;
    }

    argc--;
    argv++;
    while (argc--) {
      name = *argv++;
      ct = getset(name);
      if (ct == 0) {
          c = GETTOGGLE(name);
          if (c == 0) {
            fprintf(stderr, "'%s': unknown argument ('unset ?' for help).\r\n",
                  name);
            return 0;
          } else if (Ambiguous(c)) {
            fprintf(stderr, "'%s': ambiguous argument ('unset ?' for help).\r\n",
                  name);
            return 0;
          }
          if (c->variable) {
            *c->variable = 0;
            if (c->actionexplanation) {
                printf("%s %s.\r\n", *c->variable? "Will" : "Won't",
                                          c->actionexplanation);
            }
          }
          if (c->handler)
            (*c->handler)(0);
      } else if (Ambiguous(ct)) {
          fprintf(stderr, "'%s': ambiguous argument ('unset ?' for help).\r\n",
                  name);
          return 0;
      } else if (ct->handler) {
          (*ct->handler)(0);
          printf("%s reset to \"%s\".\r\n", ct->name, (char *)ct->charp);
      } else {
          *(ct->charp) = _POSIX_VDISABLE;
          printf("%s character is '%s'.\r\n", ct->name, control(*(ct->charp)));
      }
    }
    return 1;
}

/*
 * The following are the data structures and routines for the
 * 'mode' command.
 */
#ifdef      KLUDGELINEMODE

static int
dokludgemode(void)
{
    kludgelinemode = 1;
    send_wont(TELOPT_LINEMODE, 1);
    send_dont(TELOPT_SGA, 1);
    send_dont(TELOPT_ECHO, 1);
    return 1;
}
#endif

static int
dolinemode()
{
#ifdef      KLUDGELINEMODE
    if (kludgelinemode)
      send_dont(TELOPT_SGA, 1);
#endif
    send_will(TELOPT_LINEMODE, 1);
    send_dont(TELOPT_ECHO, 1);
    return 1;
}

static int
docharmode()
{
#ifdef      KLUDGELINEMODE
    if (kludgelinemode)
      send_do(TELOPT_SGA, 1);
    else
#endif
    send_wont(TELOPT_LINEMODE, 1);
    send_do(TELOPT_ECHO, 1);
    return 1;
}

static int
dolmmode(int bit, int on)
{
    unsigned char c;

    if (my_want_state_is_wont(TELOPT_LINEMODE)) {
      printf("?Need to have LINEMODE option enabled first.\r\n");
      printf("'mode ?' for help.\r\n");
      return 0;
    }

    if (on)
      c = (linemode | bit);
    else
      c = (linemode & ~bit);
    lm_mode(&c, 1, 1);
    return 1;
}

static int
tn_setmode(int bit)
{
    return dolmmode(bit, 1);
}

static int
tn_clearmode(int bit)
{
    return dolmmode(bit, 0);
}

struct modelist {
      char  *name;            /* command name */
      char  *help;            /* help string */
      int   (*handler)();     /* routine which executes command */
      int   needconnect;      /* Do we need to be connected to execute? */
      int   arg1;
};

static int modehelp(void);

static struct modelist ModeList[] = {
    { "character", "Disable LINEMODE option",   docharmode, 1 },
#ifdef      KLUDGELINEMODE
    { "",   "(or disable obsolete line-by-line mode)", 0 },
#endif
    { "line",     "Enable LINEMODE option",     dolinemode, 1 },
#ifdef      KLUDGELINEMODE
    { "",   "(or enable obsolete line-by-line mode)", 0 },
#endif
    { "", "", 0 },
    { "",   "These require the LINEMODE option to be enabled", 0 },
    { "isig",     "Enable signal trapping",     tn_setmode, 1, MODE_TRAPSIG },
    { "+isig",    0,                      tn_setmode, 1, MODE_TRAPSIG },
    { "-isig",    "Disable signal trapping",    tn_clearmode, 1, MODE_TRAPSIG },
    { "edit",     "Enable character editing",   tn_setmode, 1, MODE_EDIT },
    { "+edit",    0,                      tn_setmode, 1, MODE_EDIT },
    { "-edit",    "Disable character editing",  tn_clearmode, 1, MODE_EDIT },
    { "softtabs", "Enable tab expansion", tn_setmode, 1, MODE_SOFT_TAB },
    { "+softtabs", 0,                     tn_setmode, 1, MODE_SOFT_TAB },
    { "-softtabs", "Disable tab expansion",     tn_clearmode, 1, MODE_SOFT_TAB },
    { "litecho", "Enable literal character echo", tn_setmode, 1, MODE_LIT_ECHO },
    { "+litecho", 0,                      tn_setmode, 1, MODE_LIT_ECHO },
    { "-litecho", "Disable literal character echo", tn_clearmode, 1, MODE_LIT_ECHO },
    { "help",     0,                      modehelp, 0 },
#ifdef      KLUDGELINEMODE
    { "kludgeline", 0,                    dokludgemode, 1 },
#endif
    { "", "", 0 },
    { "?",  "Print help information",     modehelp, 0 },
    { 0 },
};


static int
modehelp(void)
{
    struct modelist *mt;

    printf("format is:  'mode Mode', where 'Mode' is one of:\r\n\r\n");
    for (mt = ModeList; mt->name; mt++) {
      if (mt->help) {
          if (*mt->help)
            printf("%-15s %s\r\n", mt->name, mt->help);
          else
            printf("\r\n");
      }
    }
    return 0;
}

#define     GETMODECMD(name) (struct modelist *) \
            genget(name, (char **) ModeList, sizeof(struct modelist))

static int
modecmd(int argc, char **argv)
{
    struct modelist *mt;

    if (argc != 2) {
      printf("'mode' command requires an argument\r\n");
      printf("'mode ?' for help.\r\n");
    } else if ((mt = GETMODECMD(argv[1])) == 0) {
      fprintf(stderr, "Unknown mode '%s' ('mode ?' for help).\r\n", argv[1]);
    } else if (Ambiguous(mt)) {
      fprintf(stderr, "Ambiguous mode '%s' ('mode ?' for help).\r\n", argv[1]);
    } else if (mt->needconnect && !connected) {
      printf("?Need to be connected first.\r\n");
      printf("'mode ?' for help.\r\n");
    } else if (mt->handler) {
      return (*mt->handler)(mt->arg1);
    }
    return 0;
}

/*
 * The following data structures and routines implement the
 * "display" command.
 */

static int
display(int argc, char *argv[])
{
    struct togglelist *tl;
    struct setlist *sl;

#define     dotog(tl)   if (tl->variable && tl->actionexplanation) { \
                      if (*tl->variable) { \
                        printf("will"); \
                      } else { \
                        printf("won't"); \
                      } \
                      printf(" %s.\r\n", tl->actionexplanation); \
                  }

#define     doset(sl)   if (sl->name && *sl->name != ' ') { \
                  if (sl->handler == 0) \
                      printf("%-15s [%s]\r\n", sl->name, control(*sl->charp)); \
                  else \
                      printf("%-15s \"%s\"\r\n", sl->name, (char *)sl->charp); \
                }

    if (argc == 1) {
      for (tl = Togglelist; tl->name; tl++) {
          dotog(tl);
      }
      printf("\r\n");
      for (sl = Setlist; sl->name; sl++) {
          doset(sl);
      }
    } else {
      int i;

      for (i = 1; i < argc; i++) {
          sl = getset(argv[i]);
          tl = GETTOGGLE(argv[i]);
          if (Ambiguous(sl) || Ambiguous(tl)) {
            printf("?Ambiguous argument '%s'.\r\n", argv[i]);
            return 0;
          } else if (!sl && !tl) {
            printf("?Unknown argument '%s'.\r\n", argv[i]);
            return 0;
          } else {
            if (tl) {
                dotog(tl);
            }
            if (sl) {
                doset(sl);
            }
          }
      }
    }
/*@*/optionstatus();
#if   defined(ENCRYPTION)
    EncryptStatus();
#endif
    return 1;
#undef      doset
#undef      dotog
}

/*
 * The following are the data structures, and many of the routines,
 * relating to command processing.
 */

/*
 * Set the escape character.
 */
static int
setescape(int argc, char *argv[])
{
      char *arg;
      char buf[50];

      printf(
          "Deprecated usage - please use 'set escape%s%s' in the future.\r\n",
                        (argc > 2)? " ":"", (argc > 2)? argv[1]: "");
      if (argc > 2)
            arg = argv[1];
      else {
            printf("new escape character: ");
            fgets(buf, sizeof(buf), stdin);
            arg = buf;
      }
      if (arg[0] != '\0')
            escape = arg[0];
      printf("Escape character is '%s'.\r\n", control(escape));

      fflush(stdout);
      return 1;
}

static int
togcrmod()
{
    crmod = !crmod;
    printf("Deprecated usage - please use 'toggle crmod' in the future.\r\n");
    printf("%s map carriage return on output.\r\n", crmod ? "Will" : "Won't");
    fflush(stdout);
    return 1;
}

static int
telnetsuspend()
{
#ifdef      SIGTSTP
    setcommandmode();
    {
      long oldrows, oldcols, newrows, newcols, err;

      err = (TerminalWindowSize(&oldrows, &oldcols) == 0) ? 1 : 0;
      kill(0, SIGTSTP);
      /*
       * If we didn't get the window size before the SUSPEND, but we
       * can get them now (?), then send the NAWS to make sure that
       * we are set up for the right window size.
       */
      if (TerminalWindowSize(&newrows, &newcols) && connected &&
          (err || ((oldrows != newrows) || (oldcols != newcols)))) {
            sendnaws();
      }
    }
    /* reget parameters in case they were changed */
    TerminalSaveState();
    setconnmode(0);
#else
    printf("Suspend is not supported.  Try the '!' command instead\r\n");
#endif
    return 1;
}

static int
shell(int argc, char **argv)
{
    long oldrows, oldcols, newrows, newcols, err;

    setcommandmode();

    err = (TerminalWindowSize(&oldrows, &oldcols) == 0) ? 1 : 0;
    switch(fork()) {
    case -1:
      perror("Fork failed\r\n");
      break;

    case 0:
      {
          /*
           * Fire up the shell in the child.
           */
          char *shellp, *shellname;

          shellp = getenv("SHELL");
          if (shellp == NULL)
            shellp = "/bin/sh";
          if ((shellname = strrchr(shellp, '/')) == 0)
            shellname = shellp;
          else
            shellname++;
          if (argc > 1)
            execl(shellp, shellname, "-c", &saveline[1], 0);
          else
            execl(shellp, shellname, 0);
          perror("Execl");
          _exit(1);
      }
    default:
          wait((int *)0);     /* Wait for the shell to complete */

          if (TerminalWindowSize(&newrows, &newcols) && connected &&
            (err || ((oldrows != newrows) || (oldcols != newcols)))) {
                sendnaws();
          }
          break;
    }
    return 1;
}

static int
bye(int argc, char **argv)
{
    if (connected) {
      shutdown(net, 2);
      printf("Connection closed.\r\n");
      NetClose(net);
      connected = 0;
      resettermname = 1;
#if   defined(AUTHENTICATION) || defined(ENCRYPTION)
      auth_encrypt_connect(connected);
#endif
      /* reset options */
      tninit();
    }
    if ((argc != 2) || (strcmp(argv[1], "fromquit") != 0)) 
      longjmp(toplevel, 1);
    return 0;     /* NOTREACHED */
}

int
quit(void)
{
      call(bye, "bye", "fromquit", 0);
      Exit(0);
      return 0; /*NOTREACHED*/
}

static int
logout()
{
      send_do(TELOPT_LOGOUT, 1);
      netflush();
      return 1;
}


/*
 * The SLC command.
 */

struct slclist {
      char  *name;
      char  *help;
      void  (*handler)();
      int   arg;
};

static void slc_help(void);

struct slclist SlcList[] = {
    { "export",   "Use local special character definitions",
                                    slc_mode_export,  0 },
    { "import",   "Use remote special character definitions",
                                    slc_mode_import,  1 },
    { "check",    "Verify remote special character definitions",
                                    slc_mode_import,  0 },
    { "help",     0,                      slc_help,         0 },
    { "?",  "Print help information",     slc_help,         0 },
    { 0 },
};

static void
slc_help(void)
{
    struct slclist *c;

    for (c = SlcList; c->name; c++) {
      if (c->help) {
          if (*c->help)
            printf("%-15s %s\r\n", c->name, c->help);
          else
            printf("\r\n");
      }
    }
}

static struct slclist *
getslc(char *name)
{
    return (struct slclist *)
            genget(name, (char **) SlcList, sizeof(struct slclist));
}

static int
slccmd(int argc, char **argv)
{
    struct slclist *c;

    if (argc != 2) {
      fprintf(stderr,
          "Need an argument to 'slc' command.  'slc ?' for help.\r\n");
      return 0;
    }
    c = getslc(argv[1]);
    if (c == 0) {
      fprintf(stderr, "'%s': unknown argument ('slc ?' for help).\r\n",
                        argv[1]);
      return 0;
    }
    if (Ambiguous(c)) {
      fprintf(stderr, "'%s': ambiguous argument ('slc ?' for help).\r\n",
                        argv[1]);
      return 0;
    }
    (*c->handler)(c->arg);
    slcstate();
    return 1;
}

/*
 * The ENVIRON command.
 */

struct envlist {
      char  *name;
      char  *help;
      void  (*handler)();
      int   narg;
};

static void env_help (void);

struct envlist EnvList[] = {
    { "define",   "Define an environment variable",
                                    (void (*)())env_define, 2 },
    { "undefine", "Undefine an environment variable",
                                    env_undefine,     1 },
    { "export",   "Mark an environment variable for automatic export",
                                    env_export, 1 },
    { "unexport", "Don't mark an environment variable for automatic export",
                                    env_unexport,     1 },
    { "send",     "Send an environment variable", env_send, 1 },
    { "list",     "List the current environment variables",
                                    env_list,   0 },
    { "help",     0,                      env_help,         0 },
    { "?",  "Print help information",     env_help,         0 },
    { 0 },
};

static void
env_help()
{
    struct envlist *c;

    for (c = EnvList; c->name; c++) {
      if (c->help) {
          if (*c->help)
            printf("%-15s %s\r\n", c->name, c->help);
          else
            printf("\r\n");
      }
    }
}

static struct envlist *
getenvcmd(char *name)
{
    return (struct envlist *)
            genget(name, (char **) EnvList, sizeof(struct envlist));
}

static int
env_cmd(int argc, char **argv)
{
    struct envlist *c;

    if (argc < 2) {
      fprintf(stderr,
          "Need an argument to 'environ' command.  'environ ?' for help.\r\n");
      return 0;
    }
    c = getenvcmd(argv[1]);
    if (c == 0) {
      fprintf(stderr, "'%s': unknown argument ('environ ?' for help).\r\n",
                        argv[1]);
      return 0;
    }
    if (Ambiguous(c)) {
      fprintf(stderr, "'%s': ambiguous argument ('environ ?' for help).\r\n",
                        argv[1]);
      return 0;
    }
    if (c->narg + 2 != argc) {
      fprintf(stderr,
          "Need %s%d argument%s to 'environ %s' command.  'environ ?' for help.\r\n",
            c->narg < argc + 2 ? "only " : "",
            c->narg, c->narg == 1 ? "" : "s", c->name);
      return 0;
    }
    (*c->handler)(argv[2], argv[3]);
    return 1;
}

struct env_lst {
      struct env_lst *next;   /* pointer to next structure */
      struct env_lst *prev;   /* pointer to previous structure */
      unsigned char *var;     /* pointer to variable name */
      unsigned char *value;   /* pointer to variable value */
      int export;       /* 1 -> export with default list of variables */
      int welldefined;  /* A well defined variable */
};

struct env_lst envlisthead;

struct env_lst *
env_find(unsigned char *var)
{
      struct env_lst *ep;

      for (ep = envlisthead.next; ep; ep = ep->next) {
            if (strcmp((char *)ep->var, (char *)var) == 0)
                  return(ep);
      }
      return(NULL);
}

#ifdef IRIX4
#define environ _environ
#endif

void
env_init(void)
{
      char **epp, *cp;
      struct env_lst *ep;

      for (epp = environ; *epp; epp++) {
            if ((cp = strchr(*epp, '='))) {
                  *cp = '\0';
                  ep = env_define((unsigned char *)*epp,
                              (unsigned char *)cp+1);
                  ep->export = 0;
                  *cp = '=';
            }
      }
      /*
       * Special case for DISPLAY variable.  If it is ":0.0" or
       * "unix:0.0", we have to get rid of "unix" and insert our
       * hostname.
       */
      if ((ep = env_find((unsigned char*)"DISPLAY"))
          && (*ep->value == ':'
          || strncmp((char *)ep->value, "unix:", 5) == 0)) {
            char hbuf[256+1];
            char *cp2 = strchr((char *)ep->value, ':');

            /* XXX - should be k_gethostname? */
            gethostname(hbuf, 256);
            hbuf[256] = '\0';

            /* If this is not the full name, try to get it via DNS */
            if (strchr(hbuf, '.') == 0) {
                  struct addrinfo hints, *ai, *a;
                  int error;

                  memset (&hints, 0, sizeof(hints));
                  hints.ai_flags = AI_CANONNAME;

                  error = getaddrinfo (hbuf, NULL, &hints, &ai);
                  if (error == 0) {
                        for (a = ai; a != NULL; a = a->ai_next)
                              if (a->ai_canonname != NULL) {
                                    strlcpy (hbuf,
                                           ai->ai_canonname,
                                           256);
                                    break;
                              }
                        freeaddrinfo (ai);
                  }
            }

            asprintf (&cp, "%s%s", hbuf, cp2);
            free (ep->value);
            ep->value = (unsigned char *)cp;
      }
      /*
       * If USER is not defined, but LOGNAME is, then add
       * USER with the value from LOGNAME.  By default, we
       * don't export the USER variable.
       */
      if ((env_find((unsigned char*)"USER") == NULL) && 
          (ep = env_find((unsigned char*)"LOGNAME"))) {
            env_define((unsigned char *)"USER", ep->value);
            env_unexport((unsigned char *)"USER");
      }
      env_export((unsigned char *)"DISPLAY");
      env_export((unsigned char *)"PRINTER");
      env_export((unsigned char *)"XAUTHORITY");
}

struct env_lst *
env_define(unsigned char *var, unsigned char *value)
{
      struct env_lst *ep;

      if ((ep = env_find(var))) {
            if (ep->var)
                  free(ep->var);
            if (ep->value)
                  free(ep->value);
      } else {
            ep = (struct env_lst *)malloc(sizeof(struct env_lst));
            ep->next = envlisthead.next;
            envlisthead.next = ep;
            ep->prev = &envlisthead;
            if (ep->next)
                  ep->next->prev = ep;
      }
      ep->welldefined = opt_welldefined((char *)var);
      ep->export = 1;
      ep->var = (unsigned char *)strdup((char *)var);
      ep->value = (unsigned char *)strdup((char *)value);
      return(ep);
}

void
env_undefine(unsigned char *var)
{
      struct env_lst *ep;

      if ((ep = env_find(var))) {
            ep->prev->next = ep->next;
            if (ep->next)
                  ep->next->prev = ep->prev;
            if (ep->var)
                  free(ep->var);
            if (ep->value)
                  free(ep->value);
            free(ep);
      }
}

void
env_export(unsigned char *var)
{
      struct env_lst *ep;

      if ((ep = env_find(var)))
            ep->export = 1;
}

void
env_unexport(unsigned char *var)
{
      struct env_lst *ep;

      if ((ep = env_find(var)))
            ep->export = 0;
}

void
env_send(unsigned char *var)
{
      struct env_lst *ep;

      if (my_state_is_wont(TELOPT_NEW_ENVIRON)
#ifdef      OLD_ENVIRON
          && my_state_is_wont(TELOPT_OLD_ENVIRON)
#endif
            ) {
            fprintf(stderr,
                "Cannot send '%s': Telnet ENVIRON option not enabled\r\n",
                                                      var);
            return;
      }
      ep = env_find(var);
      if (ep == 0) {
            fprintf(stderr, "Cannot send '%s': variable not defined\r\n",
                                                      var);
            return;
      }
      env_opt_start_info();
      env_opt_add(ep->var);
      env_opt_end(0);
}

void
env_list(void)
{
      struct env_lst *ep;

      for (ep = envlisthead.next; ep; ep = ep->next) {
            printf("%c %-20s %s\r\n", ep->export ? '*' : ' ',
                              ep->var, ep->value);
      }
}

unsigned char *
env_default(int init, int welldefined)
{
      static struct env_lst *nep = NULL;

      if (init) {
            nep = &envlisthead;
            return NULL;
      }
      if (nep) {
            while ((nep = nep->next)) {
                  if (nep->export && (nep->welldefined == welldefined))
                        return(nep->var);
            }
      }
      return(NULL);
}

unsigned char *
env_getvalue(unsigned char *var)
{
      struct env_lst *ep;

      if ((ep = env_find(var)))
            return(ep->value);
      return(NULL);
}


#if   defined(AUTHENTICATION)
/*
 * The AUTHENTICATE command.
 */

struct authlist {
      char  *name;
      char  *help;
      int   (*handler)();
      int   narg;
};

static int
      auth_help (void);

struct authlist AuthList[] = {
    { "status",   "Display current status of authentication information",
                                    auth_status,      0 },
    { "disable", "Disable an authentication type ('auth disable ?' for more)",
                                    auth_disable,     1 },
    { "enable", "Enable an authentication type ('auth enable ?' for more)",
                                    auth_enable,      1 },
    { "help",     0,                      auth_help,        0 },
    { "?",  "Print help information",     auth_help,        0 },
    { 0 },
};

static int
auth_help()
{
    struct authlist *c;

    for (c = AuthList; c->name; c++) {
      if (c->help) {
          if (*c->help)
            printf("%-15s %s\r\n", c->name, c->help);
          else
            printf("\r\n");
      }
    }
    return 0;
}

static int
auth_cmd(int argc, char **argv)
{
    struct authlist *c;

    if (argc < 2) {
      fprintf(stderr,
          "Need an argument to 'auth' command.  'auth ?' for help.\r\n");
      return 0;
    }

    c = (struct authlist *)
            genget(argv[1], (char **) AuthList, sizeof(struct authlist));
    if (c == 0) {
      fprintf(stderr, "'%s': unknown argument ('auth ?' for help).\r\n",
                        argv[1]);
      return 0;
    }
    if (Ambiguous(c)) {
      fprintf(stderr, "'%s': ambiguous argument ('auth ?' for help).\r\n",
                        argv[1]);
      return 0;
    }
    if (c->narg + 2 != argc) {
      fprintf(stderr,
          "Need %s%d argument%s to 'auth %s' command.  'auth ?' for help.\r\n",
            c->narg < argc + 2 ? "only " : "",
            c->narg, c->narg == 1 ? "" : "s", c->name);
      return 0;
    }
    return((*c->handler)(argv[2], argv[3]));
}
#endif


#if   defined(ENCRYPTION)
/*
 * The ENCRYPT command.
 */

struct encryptlist {
      char  *name;
      char  *help;
      int   (*handler)();
      int   needconnect;
      int   minarg;
      int   maxarg;
};

static int
      EncryptHelp (void);

struct encryptlist EncryptList[] = {
    { "enable", "Enable encryption. ('encrypt enable ?' for more)",
                                    EncryptEnable, 1, 1, 2 },
    { "disable", "Disable encryption. ('encrypt enable ?' for more)",
                                    EncryptDisable, 0, 1, 2 },
    { "type", "Set encryptiong type. ('encrypt type ?' for more)",
                                    EncryptType, 0, 1, 1 },
    { "start", "Start encryption. ('encrypt start ?' for more)",
                                    EncryptStart, 1, 0, 1 },
    { "stop", "Stop encryption. ('encrypt stop ?' for more)",
                                    EncryptStop, 1, 0, 1 },
    { "input", "Start encrypting the input stream",
                                    EncryptStartInput, 1, 0, 0 },
    { "-input", "Stop encrypting the input stream",
                                    EncryptStopInput, 1, 0, 0 },
    { "output", "Start encrypting the output stream",
                                    EncryptStartOutput, 1, 0, 0 },
    { "-output", "Stop encrypting the output stream",
                                    EncryptStopOutput, 1, 0, 0 },

    { "status",   "Display current status of authentication information",
                                    EncryptStatus,    0, 0, 0 },
    { "help",     0,                      EncryptHelp,      0, 0, 0 },
    { "?",  "Print help information",     EncryptHelp,      0, 0, 0 },
    { 0 },
};

static int
EncryptHelp()
{
    struct encryptlist *c;

    for (c = EncryptList; c->name; c++) {
      if (c->help) {
          if (*c->help)
            printf("%-15s %s\r\n", c->name, c->help);
          else
            printf("\r\n");
      }
    }
    return 0;
}

static int
encrypt_cmd(int argc, char **argv)
{
    struct encryptlist *c;

    c = (struct encryptlist *)
            genget(argv[1], (char **) EncryptList, sizeof(struct encryptlist));
    if (c == 0) {
        fprintf(stderr, "'%s': unknown argument ('encrypt ?' for help).\r\n",
                        argv[1]);
        return 0;
    }
    if (Ambiguous(c)) {
        fprintf(stderr, "'%s': ambiguous argument ('encrypt ?' for help).\r\n",
                        argv[1]);
        return 0;
    }
    argc -= 2;
    if (argc < c->minarg || argc > c->maxarg) {
      if (c->minarg == c->maxarg) {
          fprintf(stderr, "Need %s%d argument%s ",
            c->minarg < argc ? "only " : "", c->minarg,
            c->minarg == 1 ? "" : "s");
      } else {
          fprintf(stderr, "Need %s%d-%d arguments ",
            c->maxarg < argc ? "only " : "", c->minarg, c->maxarg);
      }
      fprintf(stderr, "to 'encrypt %s' command.  'encrypt ?' for help.\r\n",
            c->name);
      return 0;
    }
    if (c->needconnect && !connected) {
      if (!(argc && (isprefix(argv[2], "help") || isprefix(argv[2], "?")))) {
          printf("?Need to be connected first.\r\n");
          return 0;
      }
    }
    return ((*c->handler)(argc > 0 ? argv[2] : 0,
                  argc > 1 ? argv[3] : 0,
                  argc > 2 ? argv[4] : 0));
}
#endif


/*
 * Print status about the connection.
 */

static int
status(int argc, char **argv)
{
    if (connected) {
      printf("Connected to %s.\r\n", hostname);
      if ((argc < 2) || strcmp(argv[1], "notmuch")) {
          int mode = getconnmode();

          if (my_want_state_is_will(TELOPT_LINEMODE)) {
            printf("Operating with LINEMODE option\r\n");
            printf("%s line editing\r\n", (mode&MODE_EDIT) ? "Local" : "No");
            printf("%s catching of signals\r\n",
                              (mode&MODE_TRAPSIG) ? "Local" : "No");
            slcstate();
#ifdef      KLUDGELINEMODE
          } else if (kludgelinemode && my_want_state_is_dont(TELOPT_SGA)) {
            printf("Operating in obsolete linemode\r\n");
#endif
          } else {
            printf("Operating in single character mode\r\n");
            if (localchars)
                printf("Catching signals locally\r\n");
          }
          printf("%s character echo\r\n", (mode&MODE_ECHO) ? "Local" : "Remote");
          if (my_want_state_is_will(TELOPT_LFLOW))
            printf("%s flow control\r\n", (mode&MODE_FLOW) ? "Local" : "No");
#if   defined(ENCRYPTION)
          encrypt_display();
#endif
      }
    } else {
      printf("No connection.\r\n");
    }
    printf("Escape character is '%s'.\r\n", control(escape));
    fflush(stdout);
    return 1;
}

#ifdef      SIGINFO
/*
 * Function that gets called when SIGINFO is received.
 */
RETSIGTYPE
ayt_status(int ignore)
{
    call(status, "status", "notmuch", 0);
}
#endif

static Command *getcmd(char *name);

static void
cmdrc(char *m1, char *m2)
{
    static char rcname[128];
    Command *c;
    FILE *rcfile;
    int gotmachine = 0;
    int l1 = strlen(m1);
    int l2 = strlen(m2);
    char m1save[64];

    if (skiprc)
      return;

    strlcpy(m1save, m1, sizeof(m1save));
    m1 = m1save;

    if (rcname[0] == 0) {
      char *home = getenv("HOME");

      snprintf (rcname, sizeof(rcname), "%s/.telnetrc",
              home ? home : "");
    }

    if ((rcfile = fopen(rcname, "r")) == 0) {
      return;
    }

    for (;;) {
      if (fgets(line, sizeof(line), rcfile) == NULL)
          break;
      if (line[0] == 0)
          break;
      if (line[0] == '#')
          continue;
      if (gotmachine) {
          if (!isspace(line[0]))
            gotmachine = 0;
      }
      if (gotmachine == 0) {
          if (isspace(line[0]))
            continue;
          if (strncasecmp(line, m1, l1) == 0)
            strncpy(line, &line[l1], sizeof(line) - l1);
          else if (strncasecmp(line, m2, l2) == 0)
            strncpy(line, &line[l2], sizeof(line) - l2);
          else if (strncasecmp(line, "DEFAULT", 7) == 0)
            strncpy(line, &line[7], sizeof(line) - 7);
          else
            continue;
          if (line[0] != ' ' && line[0] != '\t' && line[0] != '\n')
            continue;
          gotmachine = 1;
      }
      makeargv();
      if (margv[0] == 0)
          continue;
      c = getcmd(margv[0]);
      if (Ambiguous(c)) {
          printf("?Ambiguous command: %s\r\n", margv[0]);
          continue;
      }
      if (c == 0) {
          printf("?Invalid command: %s\r\n", margv[0]);
          continue;
      }
      /*
       * This should never happen...
       */
      if (c->needconnect && !connected) {
          printf("?Need to be connected first for %s.\r\n", margv[0]);
          continue;
      }
      (*c->handler)(margc, margv);
    }
    fclose(rcfile);
}

int
tn(int argc, char **argv)
{
    struct servent *sp = 0;
    char *cmd, *hostp = 0, *portp = 0;
    char *user = 0;
    int port = 0;

    /* clear the socket address prior to use */

    if (connected) {
      printf("?Already connected to %s\r\n", hostname);
      return 0;
    }
    if (argc < 2) {
      strlcpy(line, "open ", sizeof(line));
      printf("(to) ");
      fgets(&line[strlen(line)], sizeof(line) - strlen(line), stdin);
      makeargv();
      argc = margc;
      argv = margv;
    }
    cmd = *argv;
    --argc; ++argv;
    while (argc) {
      if (strcmp(*argv, "help") == 0 || isprefix(*argv, "?"))
          goto usage;
      if (strcmp(*argv, "-l") == 0) {
          --argc; ++argv;
          if (argc == 0)
            goto usage;
          user = strdup(*argv++);
          --argc;
          continue;
      }
      if (strcmp(*argv, "-a") == 0) {
          --argc; ++argv;
          autologin = 1;
          continue;
      }
      if (hostp == 0) {
          hostp = *argv++;
          --argc;
          continue;
      }
      if (portp == 0) {
          portp = *argv++;
          --argc;
          continue;
      }
    usage:
      printf("usage: %s [-l user] [-a] host-name [port]\r\n", cmd);
      return 0;
    }
    if (hostp == 0)
      goto usage;

    strlcpy (_hostname, hostp, sizeof(_hostname));
    hostp = _hostname;
    if (hostp[0] == '@' || hostp[0] == '!') {
      char *p;
      hostname = NULL;
      for (p = hostp + 1; *p; p++) {
          if (*p == ',' || *p == '@')
            hostname = p;
      }
      if (hostname == NULL) {
          fprintf(stderr, "%s: bad source route specification\n", hostp);
          return 0;
      }
      *hostname++ = '\0';
    } else
      hostname = hostp;

    if (portp) {
      if (*portp == '-') {
          portp++;
          telnetport = 1;
      } else
          telnetport = 0;
      port = atoi(portp);
      if (port == 0) {
          sp = roken_getservbyname(portp, "tcp");
          if (sp)
            port = sp->s_port;
          else {
            printf("%s: bad port number\r\n", portp);
            return 0;
          }
      } else {
          port = htons(port);
      }
    } else {
      if (sp == 0) {
          sp = roken_getservbyname("telnet", "tcp");
          if (sp == 0) {
            fprintf(stderr, "telnet: tcp/telnet: unknown service\r\n");
            return 0;
          }
          port = sp->s_port;
      }
      telnetport = 1;
    }

    {
      struct addrinfo *ai, *a, hints;
      int error;
      char portstr[NI_MAXSERV];

      memset (&hints, 0, sizeof(hints));
      hints.ai_socktype = SOCK_STREAM;
      hints.ai_protocol = IPPROTO_TCP;
      hints.ai_flags    = AI_CANONNAME;

      snprintf (portstr, sizeof(portstr), "%u", ntohs(port));

      error = getaddrinfo (hostname, portstr, &hints, &ai);
      if (error) {
          fprintf (stderr, "%s: %s\r\n", hostname, gai_strerror (error));
          return 0;
      }

      for (a = ai; a != NULL && connected == 0; a = a->ai_next) {
          char addrstr[256];

          if (a->ai_canonname != NULL)
            strlcpy (_hostname, a->ai_canonname, sizeof(_hostname));

          if (getnameinfo (a->ai_addr, a->ai_addrlen,
                       addrstr, sizeof(addrstr),
                       NULL, 0, NI_NUMERICHOST) != 0)
            strlcpy (addrstr, "unknown address", sizeof(addrstr));
                       
          printf("Trying %s...\r\n", addrstr);

          net = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
          if (net < 0) {
            warn ("socket");
            continue;
          }

#if   defined(IP_OPTIONS) && defined(IPPROTO_IP) && defined(HAVE_SETSOCKOPT)
      if (hostp[0] == '@' || hostp[0] == '!') {
          char *srp = 0;
          int srlen;
          int proto, opt;

          if ((srlen = sourceroute(a, hostp, &srp, &proto, &opt)) < 0) {
            (void) NetClose(net);
            net = -1;
            continue;
          }
          if (srp && setsockopt(net, proto, opt, srp, srlen) < 0)
            perror("setsockopt (source route)");
      }
#endif

#if   defined(IPPROTO_IP) && defined(IP_TOS)
          if (a->ai_family == AF_INET) {
# if  defined(HAVE_GETTOSBYNAME)
            struct tosent *tp;
            if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
                tos = tp->t_tos;
# endif
            if (tos < 0)
                tos = 020;    /* Low Delay bit */
            if (tos
                && (setsockopt(net, IPPROTO_IP, IP_TOS,
                           (void *)&tos, sizeof(int)) < 0)
                && (errno != ENOPROTOOPT))
                perror("telnet: setsockopt (IP_TOS) (ignored)");
          }
#endif      /* defined(IPPROTO_IP) && defined(IP_TOS) */
          if (debug && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0) {
            perror("setsockopt (SO_DEBUG)");
          }

          if (connect (net, a->ai_addr, a->ai_addrlen) < 0) {
            fprintf (stderr, "telnet: connect to address %s: %s\n",
                   addrstr, strerror(errno));
            NetClose(net);
            if (a->ai_next != NULL) {
                continue;
            } else {
                freeaddrinfo (ai);
                return 0;
            }
          }
          ++connected;
#if   defined(AUTHENTICATION) || defined(ENCRYPTION)
          auth_encrypt_connect(connected);
#endif
      }
      freeaddrinfo (ai);
      if (connected == 0)
          return 0;
    }
    cmdrc(hostp, hostname);
    set_forward_options();
    if (autologin && user == NULL)
      user = (char *)get_default_username ();
    if (user) {
      env_define((unsigned char *)"USER", (unsigned char *)user);
      env_export((unsigned char *)"USER");
    }
    call(status, "status", "notmuch", 0);
    if (setjmp(peerdied) == 0)
      my_telnet((char *)user);
    NetClose(net);
    ExitString("Connection closed by foreign host.\r\n",1);
    /*NOTREACHED*/
    return 0;
}

#define HELPINDENT ((int)sizeof ("connect"))

static char
      openhelp[] =      "connect to a site",
      closehelp[] =     "close current connection",
      logouthelp[] =    "forcibly logout remote user and close the connection",
      quithelp[] =      "exit telnet",
      statushelp[] =    "print status information",
      helphelp[] =      "print help information",
      sendhelp[] =      "transmit special characters ('send ?' for more)",
      sethelp[] =       "set operating parameters ('set ?' for more)",
      unsethelp[] =     "unset operating parameters ('unset ?' for more)",
      togglestring[] ="toggle operating parameters ('toggle ?' for more)",
      slchelp[] = "change state of special charaters ('slc ?' for more)",
      displayhelp[] =   "display operating parameters",
#if   defined(AUTHENTICATION)
      authhelp[] =      "turn on (off) authentication ('auth ?' for more)",
#endif
#if   defined(ENCRYPTION)
      encrypthelp[] =   "turn on (off) encryption ('encrypt ?' for more)",
#endif
      zhelp[] =   "suspend telnet",
      shellhelp[] =     "invoke a subshell",
      envhelp[] = "change environment variables ('environ ?' for more)",
      modestring[] = "try to enter line or character mode ('mode ?' for more)";

static int help(int argc, char **argv);

static Command cmdtab[] = {
      { "close",  closehelp,  bye,        1 },
      { "logout", logouthelp, logout,           1 },
      { "display",      displayhelp,      display,    0 },
      { "mode",   modestring, modecmd,    0 },
      { "open",   openhelp,   tn,         0 },
      { "quit",   quithelp,   quit,       0 },
      { "send",   sendhelp,   sendcmd,    0 },
      { "set",    sethelp,    setcmd,           0 },
      { "unset",  unsethelp,  unsetcmd,   0 },
      { "status", statushelp, status,           0 },
      { "toggle", togglestring,     toggle,           0 },
      { "slc",    slchelp,    slccmd,           0 },
#if   defined(AUTHENTICATION)
      { "auth",   authhelp,   auth_cmd,   0 },
#endif
#if   defined(ENCRYPTION)
      { "encrypt",      encrypthelp,      encrypt_cmd,      0 },
#endif
      { "z",            zhelp,            telnetsuspend,    0 },
      { "!",            shellhelp,  shell,            0 },
      { "environ",      envhelp,    env_cmd,    0 },
      { "?",            helphelp,   help,       0 },
      { 0,            0,              0,              0 }
};

static char crmodhelp[] =     "deprecated command -- use 'toggle crmod' instead";
static char escapehelp[] =    "deprecated command -- use 'set escape' instead";

static Command cmdtab2[] = {
      { "help",   0,          help,       0 },
      { "escape", escapehelp, setescape,  0 },
      { "crmod",  crmodhelp,  togcrmod,   0 },
      { 0,            0,            0,          0 }
};


/*
 * Call routine with argc, argv set from args (terminated by 0).
 */

static int
call(intrtn_t routine, ...)
{
    va_list ap;
    char *args[100];
    int argno = 0;

    va_start(ap, routine);
    while ((args[argno++] = va_arg(ap, char *)) != 0);
    va_end(ap);
    return (*routine)(argno-1, args);
}


static Command
*getcmd(char *name)
{
    Command *cm;

    if ((cm = (Command *) genget(name, (char **) cmdtab, sizeof(Command))))
      return cm;
    return (Command *) genget(name, (char **) cmdtab2, sizeof(Command));
}

void
command(int top, char *tbuf, int cnt)
{
    Command *c;

    setcommandmode();
    if (!top) {
      putchar('\n');
    } else {
      signal(SIGINT, SIG_DFL);
      signal(SIGQUIT, SIG_DFL);
    }
    for (;;) {
      if (rlogin == _POSIX_VDISABLE)
            printf("%s> ", prompt);
      if (tbuf) {
          char *cp;
          cp = line;
          while (cnt > 0 && (*cp++ = *tbuf++) != '\n')
            cnt--;
          tbuf = 0;
          if (cp == line || *--cp != '\n' || cp == line)
            goto getline;
          *cp = '\0';
          if (rlogin == _POSIX_VDISABLE)
            printf("%s\r\n", line);
      } else {
      getline:
          if (rlogin != _POSIX_VDISABLE)
            printf("%s> ", prompt);
          if (fgets(line, sizeof(line), stdin) == NULL) {
            if (feof(stdin) || ferror(stdin)) {
                quit();
                /*NOTREACHED*/
            }
            break;
          }
      }
      if (line[0] == 0)
          break;
      makeargv();
      if (margv[0] == 0) {
          break;
      }
      c = getcmd(margv[0]);
      if (Ambiguous(c)) {
          printf("?Ambiguous command\r\n");
          continue;
      }
      if (c == 0) {
          printf("?Invalid command\r\n");
          continue;
      }
      if (c->needconnect && !connected) {
          printf("?Need to be connected first.\r\n");
          continue;
      }
      if ((*c->handler)(margc, margv)) {
          break;
      }
    }
    if (!top) {
      if (!connected) {
          longjmp(toplevel, 1);
          /*NOTREACHED*/
      }
      setconnmode(0);
    }
}

/*
 * Help command.
 */
static int
help(int argc, char **argv)
{
      Command *c;

      if (argc == 1) {
            printf("Commands may be abbreviated.  Commands are:\r\n\r\n");
            for (c = cmdtab; c->name; c++)
                  if (c->help) {
                        printf("%-*s\t%s\r\n", HELPINDENT, c->name,
                                                    c->help);
                  }
            return 0;
      }
      while (--argc > 0) {
            char *arg;
            arg = *++argv;
            c = getcmd(arg);
            if (Ambiguous(c))
                  printf("?Ambiguous help command %s\r\n", arg);
            else if (c == (Command *)0)
                  printf("?Invalid help command %s\r\n", arg);
            else
                  printf("%s\r\n", c->help);
      }
      return 0;
}


#if   defined(IP_OPTIONS) && defined(IPPROTO_IP)

/*
 * Source route is handed in as
 *    [!]@hop1@hop2...@dst
 *
 * If the leading ! is present, it is a strict source route, otherwise it is
 * assmed to be a loose source route.  Note that leading ! is effective
 * only for IPv4 case.
 *
 * We fill in the source route option as
 *    hop1,hop2,hop3...dest
 * and return a pointer to hop1, which will
 * be the address to connect() to.
 *
 * Arguments:
 *    ai:   The address (by struct addrinfo) for the final destination.
 *
 *    arg:  Pointer to route list to decipher
 *
 *    cpp:  Pointer to a pointer, so that sourceroute() can return
 *          the address of result buffer (statically alloc'ed).
 *
 *    protop/optp:
 *          Pointer to an integer.  The pointed variable
 *    lenp: pointer to an integer that contains the
 *          length of *cpp if *cpp != NULL.
 *
 * Return values:
 *
 *    Returns the length of the option pointed to by *cpp.  If the
 *    return value is -1, there was a syntax error in the
 *    option, either arg contained unknown characters or too many hosts,
 *    or hostname cannot be resolved.
 *
 *    The caller needs to pass return value (len), *cpp, *protop and *optp
 *    to setsockopt(2).
 *
 *    *cpp: Points to the result buffer.  The region is statically
 *          allocated by the function.
 *
 *    *protop:
 *          protocol # to be passed to setsockopt(2).
 *
 *    *optp:      option # to be passed to setsockopt(2).
 *
 */
int
sourceroute(struct addrinfo *ai,
          char *arg,
          char **cpp,
          int *protop,
          int *optp)
{
      char *cp, *cp2, *lsrp = NULL, *lsrep = NULL;
      struct addrinfo hints, *res;
      int len, error;
      struct sockaddr_in *sin;
      register char c;
      static char lsr[44];
#ifdef INET6
      struct cmsghdr *cmsg = NULL;
      struct sockaddr_in6 *sin6;
      static char rhbuf[1024];
#endif

      /*
       * Verify the arguments.
       */
      if (cpp == NULL)
            return -1;

      cp = arg;

      *cpp = NULL;
      switch (ai->ai_family) {
      case AF_INET:
            lsrp = lsr;
            lsrep = lsrp + sizeof(lsr);

            /*
             * Next, decide whether we have a loose source
             * route or a strict source route, and fill in
             * the begining of the option.
             */
            if (*cp == '!') {
                  cp++;
                  *lsrp++ = IPOPT_SSRR;
            } else
                  *lsrp++ = IPOPT_LSRR;
            if (*cp != '@')
                  return -1;
            lsrp++;           /* skip over length, we'll fill it in later */
            *lsrp++ = 4;
            cp++;
            *protop = IPPROTO_IP;
            *optp = IP_OPTIONS;
            break;
#ifdef INET6
      case AF_INET6:
/* this needs to be updated for rfc2292bis */
#ifdef IPV6_PKTOPTIONS
            cmsg = inet6_rthdr_init(rhbuf, IPV6_RTHDR_TYPE_0);
            if (*cp != '@')
                  return -1;
            cp++;
            *protop = IPPROTO_IPV6;
            *optp = IPV6_PKTOPTIONS;
            break;
#else
            return -1;
#endif
#endif
      default:
            return -1;
      }

      memset(&hints, 0, sizeof(hints));
      hints.ai_family = ai->ai_family;
      hints.ai_socktype = SOCK_STREAM;

      for (c = 0;;) {
            if (c == ':')
                  cp2 = 0;
            else for (cp2 = cp; (c = *cp2) != '\0'; cp2++) {
                  if (c == ',') {
                        *cp2++ = '\0';
                        if (*cp2 == '@')
                              cp2++;
                  } else if (c == '@') {
                        *cp2++ = '\0';
                  }
#if 0 /*colon conflicts with IPv6 address*/
                  else if (c == ':') {
                        *cp2++ = '\0';
                  }
#endif
                  else
                        continue;
                  break;
            }
            if (!c)
                  cp2 = 0;

            error = getaddrinfo(cp, NULL, &hints, &res);
            if (error) {
                  fprintf(stderr, "%s: %s\n", cp, gai_strerror(error));
                  return -1;
            }
            if (ai->ai_family != res->ai_family) {
                  freeaddrinfo(res);
                  return -1;
            }
            if (ai->ai_family == AF_INET) {
                  /*
                   * Check to make sure there is space for address
                   */
                  if (lsrp + 4 > lsrep) {
                        freeaddrinfo(res);
                        return -1;
                  }
                  sin = (struct sockaddr_in *)res->ai_addr;
                  memcpy(lsrp, &sin->sin_addr, sizeof(struct in_addr));
                  lsrp += sizeof(struct in_addr);
            }
#ifdef INET6
            else if (ai->ai_family == AF_INET6) {
                  sin6 = (struct sockaddr_in6 *)res->ai_addr;
                  inet6_rthdr_add(cmsg, &sin6->sin6_addr,
                        IPV6_RTHDR_LOOSE);
            }
#endif
            else {
                  freeaddrinfo(res);
                  return -1;
            }
            freeaddrinfo(res);
            if (cp2)
                  cp = cp2;
            else
                  break;
      }
      if (ai->ai_family == AF_INET) {
            /* record the last hop */
            if (lsrp + 4 > lsrep)
                  return -1;
            sin = (struct sockaddr_in *)ai->ai_addr;
            memcpy(lsrp, &sin->sin_addr, sizeof(struct in_addr));
            lsrp += sizeof(struct in_addr);
#ifndef     sysV88
            lsr[IPOPT_OLEN] = lsrp - lsr;
            if (lsr[IPOPT_OLEN] <= 7 || lsr[IPOPT_OLEN] > 40)
                  return -1;
            *lsrp++ = IPOPT_NOP;    /*32bit word align*/
            len = lsrp - lsr;
            *cpp = lsr;
#else
            ipopt.io_len = lsrp - lsr;
            if (ipopt.io_len <= 5)  /*is 3 better?*/
                  return -1;
            *cpp = (char 8)&ipopt;
#endif
      }
#ifdef INET6
      else if (ai->ai_family == AF_INET6) {
            inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE);
            len = cmsg->cmsg_len;
            *cpp = rhbuf;
      }
#endif
      else
            return -1;
      return len;
}
#endif

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