ftp/cmds.c - master - niceSOFT/inetutils

ftp/cmds.c
2 715 строк51 KB
Collin Funk
ftp: assume char is 8 bits
13 апр 2026, 01:41
13 апр 2026, 01:411655856
/*
  Copyright (C) 1995-2026 Free Software Foundation, Inc.

  This file is part of GNU Inetutils.

  GNU Inetutils is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or (at
  your option) any later version.

  GNU Inetutils is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see `http://www.gnu.org/licenses/'. */

/*
 * Copyright (c) 1985, 1989, 1993, 1994
 *	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. 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.
 */

/*
 * FTP User Program -- Command Routines.
 */
#include <config.h>

#include <sys/param.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/ftp.h>

#include <ctype.h>
#include <error.h>
#include <errno.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>		/* intmax_t */
#include <string.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
/* Include glob.h last, because it may define "const" which breaks
   system headers on some platforms. */
#include <glob.h>

#ifdef HAVE_READLINE_READLINE_H
# include <readline/readline.h>
#elif defined HAVE_EDITLINE_READLINE_H
# include <editline/readline.h>
#endif
#ifdef HAVE_READLINE_HISTORY_H
# include <readline/history.h>
#elif defined HAVE_EDITLINE_HISTORY_H
# include <editline/history.h>
#endif

#include "ftp_var.h"
#include "attribute.h"
#include "xalloc.h"
#include "xgetcwd.h"

#ifndef DEFPORT
# ifdef IPPORT_FTP
#  define DEFPORT IPPORT_FTP
# else/* !IPPORT_FTP */
#  define DEFPORT 21
# endif
#endif /* !DEFPORT */

/* Returns true if STR is entirely lower case.  */
static int
all_lower (char *str)
{
  while (*str)
    if (isupper (*str++))
      return 0;
  return 1;
}

/* Returns true if STR is entirely upper case.  */
static int
all_upper (char *str)
{
  while (*str)
    if (islower (*str++))
      return 0;
  return 1;
}

/* Destructively converts STR to lower case.  */
static char *
strdown (char *str)
{
  char *p;
  for (p = str; *p; p++)
    if (isupper (*p))
      *p = tolower (*p);
  return str;
}

jmp_buf jabort;
char *mname;
char *home = "/";

char *mapin = 0;
char *mapout = 0;

/*
 * `Another' gets another argument, and stores the new argc and argv.
 * It reverts to the top level (via main.c's intr()) on EOF/error.
 *
 * Returns false if no new arguments have been added.
 */
int
another (int *pargc, char ***pargv, const char *prompt)
{
  char *arg = NULL;
  char *buffer, *new;
  size_t size = 0, len = strlen (line);
  int ret;

  buffer = (char *) malloc (sizeof (char) * (strlen (prompt) + 4));
  if (!buffer)
    intr (0);

  sprintf (buffer, "(%s) ", prompt);

#if HAVE_READLINE
  if (usereadline)
    arg = readline (buffer);
  else
#endif /* HAVE_READLINE */
    {
      char *nl;

      fprintf (stdout, "%s", buffer);
      fflush (stdout);

      if (getline (&arg, &size, stdin) <= 0)
	{
	  free (buffer);
	  free (arg);
	  intr (0);
	}

      nl = strchr (arg, '\n');
      if (nl)
	*nl = '\0';
    }

  free (buffer);

#if HAVE_READLINE
  if (usereadline && arg && *arg)
    add_history (arg);
#endif /* HAVE_READLINE */

  if (!arg)
    intr (0);
  else if (!*arg)
    {
      free (arg);
      return 0;
    }

  new = realloc (line, sizeof (char) *
		 ((linelen ? linelen : len) + strlen (arg) + 2));
  if (!new)
    {
      free (arg);
      intr (0);
    }

  line = new;
  linelen = sizeof (char) * ((linelen ? linelen : len) + strlen (arg) + 2);
  line[len++] = ' ';
  strcpy (&line[len], arg);
  free (arg);

  makeargv ();
  ret = margc > *pargc;
  *pargc = margc;
  *pargv = margv;
  return (ret);
}

/*
 * Connect to peer server and
 * auto-login, if possible.
 */
void
setpeer (int argc, char **argv)
{
  char *host = NULL;
  int port;

  if (connected && command ("NOOP") != COMPLETE)
    disconnect (0, 0);
  else if (connected)
    {
      printf ("Already connected to %s, use close first.\n", hostname);
      code = -1;
      return;
    }

  if (argc < 2)
    {
      if (hostname)
	{
	  host = hostname;
	  argc = 2;
	}
      else
	another (&argc, &argv, "to");
    }

  if (argc < 2 || argc > 3)
    {
      printf ("usage: %s host-name [port]\n", argv[0]);
      code = -1;
      return;
    }

  if (!host)
    host = argv[1];

  if (argc == 3)
    {
      if (isdigit (argv[2][0]) || argv[2][0] == '-')
	port = atoi (argv[2]);
      else
	{
	  struct servent *sp;

	  sp = getservbyname (argv[2], "tcp");
	  port = (sp) ? ntohs (sp->s_port) : 0;
	}

      if (port <= 0 || port > 65535)
	{
	  printf ("%s: bad port -- %s\n", argv[1], argv[2]);
	  printf ("usage: %s host-name [port]\n", argv[0]);
	  code = -1;
	  return;
	}
    }
  else
    {
      struct servent *sp;

      sp = getservbyname ("ftp", "tcp");
      port = (sp) ? ntohs (sp->s_port) : DEFPORT;
    }

  /* After hookup(), the global variable `hostname' contains
   * the canonical host name corresponding to the alias name
   * contained in HOST.  The return value of hookup() is not
   * NULL only if the server has answered our call.  The value
   * of HOST should be preserved for reporting inside login(),
   * which also detects a correct stanza of the netrc file.
   */
  if (hookup (host, port))
    {
      int overbose;

      connected = 1;
      /*
       * Set up defaults for FTP.
       */
      strcpy (typename, "ascii"), type = TYPE_A;
      curtype = TYPE_A;
      strcpy (formname, "non-print"), form = FORM_N;
      strcpy (modename, "stream"), mode = MODE_S;
      strcpy (structname, "file"), stru = STRU_F;
      strcpy (bytename, "8"), bytesize = 8;
      if (autologin)
	login (host);

#if (defined unix || defined __unix || defined __unix__)
/*
 * this ifdef is to keep someone form "porting" this to an incompatible
 * system and not checking this out. This way they have to think about it.
 */
      overbose = verbose;
      if (debug == 0)
	verbose = -1;
      if (command ("SYST") == COMPLETE && overbose)
	{
	  char *cp, c;
	  cp = strchr (reply_string + 4, ' ');
	  if (cp == NULL)
	    cp = strchr (reply_string + 4, '\r');
	  if (cp)
	    {
	      if (cp[-1] == '.')
		cp--;
	      c = *cp;
	      *cp = '\0';
	    }

	  printf ("Remote system type is %s.\n", reply_string + 4);
	  if (cp)
	    *cp = c;
	}
      if (!strncmp (reply_string, "215 UNIX Type: L8", 17))
	{
	  if (proxy)
	    unix_proxy = 1;
	  else
	    unix_server = 1;
	  /*
	   * Set type to 0 (not specified by user),
	   * meaning binary by default, but don't bother
	   * telling server.  We can use binary
	   * for text files unless changed by the user.
	   */
	  type = 0;
	  strcpy (typename, "binary");
	  if (overbose)
	    printf ("Using %s mode to transfer files.\n", typename);
	}
      else
	{
	  if (proxy)
	    unix_proxy = 0;
	  else
	    unix_server = 0;
	  if (overbose && !strncmp (reply_string, "215 TOPS20", 10))
	    printf
	      ("Remember to set tenex mode when transferring binary files from this machine.\n");
	}
      verbose = overbose;
#endif /* (unix || __unix || __unix__) */
    }
}

struct types
{
  char *t_name;
  char *t_mode;
  int t_type;
  char *t_arg;
} types[] = {
  {"ascii", "A", TYPE_A, 0},
  {"binary", "I", TYPE_I, 0},
  {"image", "I", TYPE_I, 0},
  {"ebcdic", "E", TYPE_E, 0},
  {"tenex", "L", TYPE_L, bytename},
  {NULL, NULL, 0, NULL}
};

/*
 * Set transfer type.
 */
void
settype (int argc, char **argv)
{
  struct types *p;
  int comret;

  if (argc > 2)
    {
      char *sep;

      printf ("usage: %s [", argv[0]);
      sep = " ";
      for (p = types; p->t_name; p++)
	{
	  printf ("%s%s", sep, p->t_name);
	  sep = " | ";
	}
      printf (" ]\n");
      code = -1;
      return;
    }
  if (argc < 2)
    {
      printf ("Using %s mode to transfer files.\n", typename);
      code = 0;
      return;
    }
  for (p = types; p->t_name; p++)
    if (strcmp (argv[1], p->t_name) == 0)
      break;
  if (p->t_name == 0)
    {
      printf ("%s: unknown mode\n", argv[1]);
      code = -1;
      return;
    }
  if ((p->t_arg != NULL) && (*(p->t_arg) != '\0'))
    comret = command ("TYPE %s %s", p->t_mode, p->t_arg);
  else
    comret = command ("TYPE %s", p->t_mode);
  if (comret == COMPLETE)
    {
      strcpy (typename, p->t_name);
      curtype = type = p->t_type;
    }
}

/*
 * Internal form of settype; changes current type in use with server
 * without changing our notion of the type for data transfers.
 * Used to change to and from ascii for listings.
 */
void
changetype (int newtype, int show)
{
  struct types *p;
  int comret, oldverbose = verbose;

  if (newtype == 0)
    newtype = TYPE_I;
  if (newtype == curtype)
    return;
  if (debug == 0 && show == 0)
    verbose = 0;
  for (p = types; p->t_name; p++)
    if (newtype == p->t_type)
      break;
  if (p->t_name == 0)
    {
      printf ("ftp: internal error: unknown type %d\n", newtype);
      return;
    }
  if (newtype == TYPE_L && bytename[0] != '\0')
    comret = command ("TYPE %s %s", p->t_mode, bytename);
  else
    comret = command ("TYPE %s", p->t_mode);
  if (comret == COMPLETE)
    curtype = newtype;
  verbose = oldverbose;
}

char *stype[] = {
  "type",
  "",
  0
};

/*
 * Set binary transfer type.
 */
void
setbinary (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  stype[1] = "binary";
  settype (2, stype);
}

/*
 * Set ascii transfer type.
 */
void
setascii (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  stype[1] = "ascii";
  settype (2, stype);
}

/*
 * Set tenex transfer type.
 */
void
settenex (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  stype[1] = "tenex";
  settype (2, stype);
}

/*
 * Set file transfer mode.
 */
void
setftmode (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  printf ("We only support %s mode, sorry.\n", modename);
  code = -1;
}

/*
 * Set file transfer format.
 */
void
setform (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  printf ("We only support %s format, sorry.\n", formname);
  code = -1;
}

/*
 * Set file transfer structure.
 */
void
setstruct (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  printf ("We only support %s structure, sorry.\n", structname);
  code = -1;
}

/*
 * Send a single file.
 */
void
put (int argc, char **argv)
{
  char *cmd, *local, *remote;
  int loc = 0;

  if (argc == 2)
    {
      argc++;
      argv[2] = argv[1];
      loc++;
    }
  if (argc < 2 && !another (&argc, &argv, "local-file"))
    goto usage;
  if (argc < 3 && !another (&argc, &argv, "remote-file"))
    {
    usage:
      printf ("usage: %s local-file remote-file\n", argv[0]);
      code = -1;
      return;
    }

  local = globulize (argv[1]);
  if (!local)
    {
      code = -1;
      return;
    }

  /*
   * If "globulize" modifies argv[1], and argv[2] is a copy of
   * the old argv[1], make it a copy of the new argv[1].
   */
  if (loc)
    remote = strdup (local);
  else
    remote = strdup (argv[2]);

  cmd = (argv[0][0] == 'a') ? "APPE" : ((sunique) ? "STOU" : "STOR");
  if (loc && ntflag)
    {
      char *new = dotrans (remote);
      free (remote);
      remote = new;
    }
  if (loc && mapflag)
    {
      char *new = domap (remote);
      if (new != remote)
	{
	  free (remote);
	  remote = new;
	}
    }
  sendrequest (cmd, local, remote,
	       strcmp (argv[1], local) != 0 || strcmp (argv[2], remote) != 0);
  free (local);
  free (remote);
}

/*
 * Send multiple files.
 */
void
mput (int argc, char **argv)
{
  int i;
  sighandler_t oldintr;
  int ointer;

  if (argc < 2 && !another (&argc, &argv, "local-files"))
    {
      printf ("usage: %s local-files\n", argv[0]);
      code = -1;
      return;
    }
  mname = argv[0];
  mflag = 1;
  oldintr = signal (SIGINT, mabort);
  setjmp (jabort);
  if (proxy)
    {
      char *cp;

      while ((cp = remglob (argv, 0)) != NULL)
	{
	  if (*cp == 0)
	    mflag = 0;
	  if (mflag && confirm (argv[0], cp))
	    {
	      char *tp = cp;

	      if (mcase)
		{
		  if (all_upper (tp))
		    tp = strdown (strdup (tp));
		}
	      if (ntflag)
		{
		  char *new = dotrans (tp);
		  if (tp != cp)
		    free (tp);
		  tp = new;
		}
	      if (mapflag)
		{
		  char *new = domap (tp);
		  if (new != tp)
		    {
		      if (tp != cp)
			free (tp);
		      tp = new;
		    }
		}
	      sendrequest ((sunique) ? "STOU" : "STOR",
			   cp, tp, cp != tp || !interactive);
	      if (!mflag && fromatty)
		{
		  ointer = interactive;
		  interactive = 1;
		  if (confirm ("Continue with", "mput"))
		    {
		      mflag++;
		    }
		  interactive = ointer;
		}

	      if (tp != cp)
		free (tp);
	    }

	  free (cp);
	}
      signal (SIGINT, oldintr);
      mflag = 0;
      return;
    }
  for (i = 1; i < argc; i++)
    {
      char **cpp;
      glob_t gl;
      int flags;

      if (!doglob)
	{
	  if (mflag && confirm (argv[0], argv[i]))
	    {
	      char *tp = argv[i];
	      if (ntflag)
		tp = dotrans (tp);
	      if (mapflag)
		{
		  char *new = domap (tp);
		  if (new != tp)
		    {
		      if (tp != argv[i])
			free (tp);
		      tp = new;
		    }
		}
	      sendrequest ((sunique) ? "STOU" : "STOR",
			   argv[i], tp, tp != argv[i] || !interactive);
	      if (!mflag && fromatty)
		{
		  ointer = interactive;
		  interactive = 1;
		  if (confirm ("Continue with", "mput"))
		    {
		      mflag++;
		    }
		  interactive = ointer;
		}
	      if (tp != argv[i])
		free (tp);
	    }
	  continue;
	}

      memset (&gl, 0, sizeof (gl));
      flags = GLOB_NOCHECK;
#ifdef GLOB_BRACE
      flags |= GLOB_BRACE;
#endif
#ifdef GLOB_TILDE
      flags |= GLOB_TILDE;
#endif
#ifdef GLOB_QUOTE
      flags |= GLOB_QUOTE;
#endif
      if (glob (argv[i], flags, NULL, &gl) || gl.gl_pathc == 0)
	{
	  error (0, 0, "%s: not found", argv[i]);
	  globfree (&gl);
	  continue;
	}
      for (cpp = gl.gl_pathv; cpp && *cpp != NULL; cpp++)
	{
	  if (mflag && confirm (argv[0], *cpp))
	    {
	      char *tp = *cpp;
	      if (ntflag)
		tp = dotrans (tp);
	      if (mapflag)
		{
		  char *new = domap (tp);
		  if (new != tp)
		    {
		      if (tp != *cpp)
			free (tp);
		      tp = new;
		    }
		}
	      sendrequest ((sunique) ? "STOU" : "STOR",
			   *cpp, tp, *cpp != tp || !interactive);
	      if (!mflag && fromatty)
		{
		  ointer = interactive;
		  interactive = 1;
		  if (confirm ("Continue with", "mput"))
		    {
		      mflag++;
		    }
		  interactive = ointer;
		}
	      if (tp != *cpp)
		free (tp);
	    }
	}
      globfree (&gl);
    }
  signal (SIGINT, oldintr);
  mflag = 0;
}

void
reget (int argc, char **argv)
{

  getit (argc, argv, 1, "r+w");
}

void
get (int argc, char **argv)
{

  getit (argc, argv, 0, restart_point ? "r+w" : "w");
}

/*
 * Receive one file.
 */
int
getit (int argc, char **argv, int restartit, char *mode)
{
  int loc = 0;
  char *local;

  if (argc == 2)
    {
      argc++;
      argv[2] = argv[1];
      loc++;
    }
  if (argc < 2 && !another (&argc, &argv, "remote-file"))
    goto usage;
  if (argc < 3 && !another (&argc, &argv, "local-file"))
    {
    usage:
      printf ("usage: %s remote-file [ local-file ]\n", argv[0]);
      code = -1;
      return (0);
    }

  local = globulize (argv[2]);
  if (!local)
    {
      code = -1;
      return (0);
    }
  if (loc && mcase && all_upper (local))
    strdown (local);
  if (loc && ntflag)
    {
      char *new = dotrans (local);
      free (local);
      local = new;
    }
  if (loc && mapflag)
    {
      char *new = domap (local);
      if (new != local)
	{
	  free (local);
	  local = new;
	}
    }
  if (restartit)
    {
      struct stat stbuf;
      int ret;

      ret = stat (local, &stbuf);
      if (restartit == 1)
	{
	  if (ret < 0)
	    {
	      error (0, errno, "local: %s", local);
	      free (local);
	      return (0);
	    }
	  restart_point = stbuf.st_size;
	}
      else
	{
	  if (ret == 0)
	    {
	      int overbose;

	      overbose = verbose;
	      if (debug == 0)
		verbose = -1;
	      if (command ("MDTM %s", argv[1]) == COMPLETE)
		{
		  int yy, mo, day, hour, min, sec;
		  struct tm *tm;
		  verbose = overbose;
		  sscanf (reply_string,
			  "%*s %04d%02d%02d%02d%02d%02d",
			  &yy, &mo, &day, &hour, &min, &sec);
		  tm = gmtime (&stbuf.st_mtime);
		  tm->tm_mon++;
		  if (tm->tm_year + 1900 > yy)
		    {
		      free (local);
		      return (1);
		    }
		  if ((tm->tm_year + 1900 == yy &&
		       tm->tm_mon > mo) ||
		      (tm->tm_mon == mo &&
		       tm->tm_mday > day) ||
		      (tm->tm_mday == day &&
		       tm->tm_hour > hour) ||
		      (tm->tm_hour == hour &&
		       tm->tm_min > min) ||
		      (tm->tm_min == min && tm->tm_sec > sec))
		    {
		      free (local);
		      return (1);
		    }
		}
	      else
		{
		  printf ("%s\n", reply_string);
		  verbose = overbose;
		  free (local);
		  return (0);
		}
	    }
	}
    }

  recvrequest ("RETR", local, argv[1], mode, strcmp (local, argv[2]) != 0);
  restart_point = 0;
  free (local);
  return (0);
}

void
mabort (int signo MAYBE_UNUSED)
{
  int ointer;

  printf ("\n");
  fflush (stdout);
  if (mflag && fromatty)
    {
      ointer = interactive;
      interactive = 1;
      if (confirm ("Continue with", mname))
	{
	  interactive = ointer;
	  longjmp (jabort, 0);
	}
      interactive = ointer;
    }
  mflag = 0;
  longjmp (jabort, 0);
}

/*
 * Get multiple files.
 */
void
mget (int argc, char **argv)
{
  sighandler_t oldintr;
  int ointer;
  char *cp, *tp;

  if (argc < 2 && !another (&argc, &argv, "remote-files"))
    {
      printf ("usage: %s remote-files\n", argv[0]);
      code = -1;
      return;
    }
  mname = argv[0];
  mflag = 1;
  oldintr = signal (SIGINT, mabort);
  setjmp (jabort);
  while ((cp = remglob (argv, proxy)) != NULL)
    {
      if (*cp == '\0')
	{
	  mflag = 0;
	  continue;
	}
      if (mflag && confirm (argv[0], cp))
	{
	  tp = cp;
	  if (mcase && !all_lower (tp))
	    tp = strdown (strdup (tp));
	  if (ntflag)
	    {
	      char *new = dotrans (tp);
	      if (tp != cp)
		free (tp);
	      tp = new;
	    }
	  if (mapflag)
	    {
	      char *new = domap (tp);
	      if (new != tp)
		{
		  if (tp != cp)
		    free (tp);
		  tp = new;
		}
	    }
	  recvrequest ("RETR", tp, cp, "w", tp != cp || !interactive);
	  if (!mflag && fromatty)
	    {
	      ointer = interactive;
	      interactive = 1;
	      if (confirm ("Continue with", "mget"))
		{
		  mflag++;
		}
	      interactive = ointer;
	    }
	  if (tp != cp)
	    free (tp);
	}
      free (cp);
    }
  signal (SIGINT, oldintr);
  mflag = 0;
}

char *
remglob (char **argv, int doswitch)
{
  static FILE *ftemp = NULL;
  static char **args;
  int buf_len = 0;
  char *buf = 0;
  int sofar = 0;
  int oldverbose, oldhash;
  int fd;
  char *cp, *mode;

  if (!mflag)
    {
      if (!doglob)
	{
	  args = NULL;
	}
      else
	{
	  if (ftemp)
	    {
	      fclose (ftemp);
	      ftemp = NULL;
	    }
	}
      return (NULL);
    }
  if (!doglob)
    {
      if (args == NULL)
	args = argv;
      if ((cp = *++args) == NULL)
	args = NULL;
      return cp ? strdup (cp) : NULL;
    }
  if (ftemp == NULL)
    {
      char temp[sizeof PATH_TMP + sizeof "XXXXXX"];

      strcpy (temp, PATH_TMP);
      strcat (temp, "XXXXXX");
#ifdef HAVE_MKSTEMP
      fd = mkstemp (temp);
#else
      if (mktemp (temp) != NULL)
	fd = open (temp, O_CREAT | O_EXCL | O_RDWR, 0600);
      else
	fd = -1;
#endif
      if (fd < 0)
	{
	  printf ("unable to create temporary file %s: %s\n", temp,
		  strerror (errno));
	  return (NULL);
	}
      close (fd);

      oldverbose = verbose, verbose = 0;
      oldhash = hash, hash = 0;
      if (doswitch)
	{
	  pswitch (!proxy);
	}
      for (mode = "w"; *++argv != NULL; mode = "a")
	recvrequest ("NLST", temp, *argv, mode, 0);
      if (doswitch)
	{
	  pswitch (!proxy);
	}
      verbose = oldverbose;
      hash = oldhash;
      ftemp = fopen (temp, "r");
      unlink (temp);
      if (ftemp == NULL)
	{
	  printf ("can't find list of remote files, oops\n");
	  return (NULL);
	}
    }

  buf_len = 100;		/* Any old size */
  buf = malloc (buf_len + 1);

  sofar = 0;
  for (;;)
    {
      if (!buf)
	{
	  printf ("malloc failure\n");
	  return 0;
	}
      if (!fgets (buf + sofar, buf_len - sofar, ftemp))
	{
	  fclose (ftemp);
	  ftemp = NULL;
	  free (buf);
	  return 0;
	}

      sofar = strlen (buf);
      if (buf[sofar - 1] == '\n')
	{
	  buf[sofar - 1] = '\0';
	  return buf;
	}

      /* Make more room and read some more... */
      buf_len += buf_len;
      buf = realloc (buf, buf_len);
    }
}

char *
onoff (int val)
{
  return (val ? "on" : "off");
}

/*
 * Show status.
 */
void
status (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{
  int i;

  if (connected)
    printf ("Connected to %s.\n", hostname);
  else
    printf ("Not connected.\n");
  printf ("Connection addressing: %s\n",
	  (usefamily == AF_UNSPEC) ? "any"
	  : (usefamily == AF_INET6) ? "IPv6" : "IPv4");
  if (!proxy)
    {
      pswitch (1);
      if (connected)
	{
	  printf ("Connected for proxy commands to %s.\n", hostname);
	}
      else
	{
	  printf ("No proxy connection.\n");
	}
      pswitch (0);
    }
  printf ("Mode: %s; Type: %s; Form: %s; Structure: %s\n",
	  modename, typename, formname, structname);
  printf ("Verbose: %s; Bell: %s; Prompting: %s; Globbing: %s\n",
	  onoff (verbose), onoff (bell), onoff (interactive), onoff (doglob));
  printf ("Store unique: %s; Receive unique: %s\n", onoff (sunique),
	  onoff (runique));
  printf ("Case: %s; CR stripping: %s\n", onoff (mcase), onoff (crflag));
  if (ntflag)
    {
      printf ("Ntrans: (in) %s (out) %s\n", ntin, ntout);
    }
  else
    {
      printf ("Ntrans: off\n");
    }
  if (mapflag)
    {
      printf ("Nmap: (in) %s (out) %s\n", mapin, mapout);
    }
  else
    {
      printf ("Nmap: off\n");
    }
  printf ("Hash mark printing: %s; Use of PORT cmds: %s\n",
	  onoff (hash), onoff (sendport));
  printf ("Use of EPRT/EPSV for IPv4: %s\n", onoff (doepsv4));
  if (macnum > 0)
    {
      printf ("Macros:\n");
      for (i = 0; i < macnum; i++)
	{
	  printf ("\t%s\n", macros[i].mac_name);
	}
    }
  code = 0;
}

/*
 * Set beep on cmd completed mode.
 */
void
setbell (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  bell = !bell;
  printf ("Bell mode %s.\n", onoff (bell));
  code = bell;
}

/*
 * Turn on packet tracing.
 */
void
settrace (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  trace = !trace;
  printf ("Packet tracing %s.\n", onoff (trace));
  code = trace;
}

/*
 * Toggle hash mark printing during transfers.
 *
 * Parse multipliers 'k', 'K', 'm', 'M', and
 * 'g', 'G' to simplify the size step.
 *
 * With a numerical argument, hash marking is
 * made active, and the step size is updated.
 * Toggle state only in absence of an argument.
 */
void
sethash (int argc MAYBE_UNUSED, char **argv)
{
  char *p = argv[1];

  /* P is NULL when no argument was passed with `hash'.  */
  while (p && isdigit (*p))
    p++;

  if (argv[1] != NULL)
    sscanf (argv[1], "%d", &hashbytes);

  /* Apply a multiplier only if a numerical part exists.  */
  if (argv[1] && isdigit (*argv[1]))
    {
      hash = 1;			/* Enforce markers.  */

      switch (*p)
	{
	case 'g':
	case 'G':
	  hashbytes *= 1024 * 1024 * 1024;
	  break;
	case 'm':
	case 'M':
	  hashbytes *= 1024 * 1024;
	  break;
	case 'k':
	case 'K':
	  hashbytes *= 1024;
	}
    }

  if (hashbytes <= 0)
    hashbytes = 1024;

  if (!argv[1])			/* Toggle when argument is absent.  */
    hash = !hash;

  printf ("Hash mark printing %s", onoff (hash));
  if (hash)
    printf (" (%d bytes/hash mark)", hashbytes);
  printf (".\n");

  code = hash;
}

/*
 * Turn on printing of server echo's.
 */
void
setverbose (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  verbose = !verbose;
  printf ("Verbose mode %s.\n", onoff (verbose));
  code = verbose;
}

/*
 * Allow any address family.
 */
void
setipany (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{
  usefamily = AF_UNSPEC;
  printf ("Selecting addresses: %s.\n", "any");
  code = usefamily;
}

/*
 * Restrict to IPv4 addresses.
 */
void
setipv4 (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{
  usefamily = AF_INET;
  printf ("Selecting addresses: %s.\n", "IPv4");
  code = usefamily;
}

/*
 * Restrict to IPv6 addresses.
 */
void
setipv6 (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{
  usefamily = AF_INET6;
  printf ("Selecting addresses: %s.\n", "IPv6");
  code = usefamily;
}

/*
 * Toggle use of EPRT/EPRT for IPv4.
 */
void
setepsv4 (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  doepsv4 = !doepsv4;
  printf ("Use of EPRT/EPSV for IPv4: %s.\n", onoff (doepsv4));
  code = doepsv4;
}

/*
 * Toggle PORT cmd use before each data connection.
 */
void
setport (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  sendport = !sendport;
  printf ("Use of PORT cmds %s.\n", onoff (sendport));
  code = sendport;
}

/*
 * Turn on interactive prompting
 * during mget, mput, and mdelete.
 */
void
setprompt (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  interactive = !interactive;
  printf ("Interactive mode %s.\n", onoff (interactive));
  code = interactive;
}

/*
 * Toggle metacharacter interpretation
 * on local file names.
 */
void
setglob (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  doglob = !doglob;
  printf ("Globbing %s.\n", onoff (doglob));
  code = doglob;
}

/*
 * Set debugging mode on/off and/or
 * set level of debugging.
 */
void
setdebug (int argc, char **argv)
{
  int val;

  if (argc > 1)
    {
      val = atoi (argv[1]);
      if (val < 0)
	{
	  printf ("%s: bad debugging value.\n", argv[1]);
	  code = -1;
	  return;
	}
    }
  else
    val = !debug;
  debug = val;
  if (debug)
    options |= SO_DEBUG;
  else
    options &= ~SO_DEBUG;
  printf ("Debugging %s (debug=%d).\n", onoff (debug), debug);
  code = debug > 0;
}

/*
 * Set current working directory
 * on remote machine.
 */
void
cd (int argc, char **argv)
{

  if (argc < 2 && !another (&argc, &argv, "remote-directory"))
    {
      printf ("usage: %s remote-directory\n", argv[0]);
      code = -1;
      return;
    }
  if (command ("CWD %s", argv[1]) == ERROR && code == 500)
    {
      if (verbose)
	printf ("CWD command not recognized, trying XCWD\n");
      command ("XCWD %s", argv[1]);
    }
}

/*
 * Set current working directory
 * on local machine.
 */
void
lcd (int argc, char **argv)
{
  char *dir;

  if (argc < 2)
    argc++, argv[1] = home;
  if (argc != 2)
    {
      printf ("usage: %s local-directory\n", argv[0]);
      code = -1;
      return;
    }

  dir = globulize (argv[1]);
  if (!dir)
    {
      code = -1;
      return;
    }

  if (chdir (dir) < 0)
    {
      error (0, errno, "dir: %s", dir);
      free (dir);
      code = -1;
      return;
    }

  free (dir);

  dir = xgetcwd ();
  if (dir)
    {
      printf ("Local directory now %s\n", dir);
      free (dir);
    }
  else
    error (0, errno, "getcwd");
  code = 0;
}

/*
 * Delete a single file.
 */
void
delete (int argc, char **argv)
{

  if (argc < 2 && !another (&argc, &argv, "remote-file"))
    {
      printf ("usage: %s remote-file\n", argv[0]);
      code = -1;
      return;
    }
  command ("DELE %s", argv[1]);
}

/*
 * Delete multiple files.
 */
void
mdelete (int argc, char **argv)
{
  sighandler_t oldintr;
  int ointer;
  char *cp;

  if (argc < 2 && !another (&argc, &argv, "remote-files"))
    {
      printf ("usage: %s remote-files\n", argv[0]);
      code = -1;
      return;
    }
  mname = argv[0];
  mflag = 1;
  oldintr = signal (SIGINT, mabort);
  setjmp (jabort);
  while ((cp = remglob (argv, 0)) != NULL)
    {
      if (*cp == '\0')
	{
	  mflag = 0;
	  continue;
	}
      if (mflag && confirm (argv[0], cp))
	{
	  command ("DELE %s", cp);
	  if (!mflag && fromatty)
	    {
	      ointer = interactive;
	      interactive = 1;
	      if (confirm ("Continue with", "mdelete"))
		{
		  mflag++;
		}
	      interactive = ointer;
	    }
	}
      free (cp);
    }
  signal (SIGINT, oldintr);
  mflag = 0;
}

/*
 * Rename a remote file.
 */
void
renamefile (int argc, char **argv)
{

  if (argc < 2 && !another (&argc, &argv, "from-name"))
    goto usage;
  if (argc < 3 && !another (&argc, &argv, "to-name"))
    {
    usage:
      printf ("%s from-name to-name\n", argv[0]);
      code = -1;
      return;
    }
  if (command ("RNFR %s", argv[1]) == CONTINUE)
    command ("RNTO %s", argv[2]);
}

/*
 * Get a directory listing
 * of remote files.
 */
void
ls (int argc, char **argv)
{
  char *cmd, *dest;

  if (argc < 2)
    argc++, argv[1] = NULL;
  if (argc < 3)
    argc++, argv[2] = "-";
  if (argc > 3)
    {
      printf ("usage: %s remote-directory local-file\n", argv[0]);
      code = -1;
      return;
    }
  cmd = argv[0][0] == 'n' ? "NLST" : "LIST";

  if (strcmp (argv[2], "-") != 0)
    {
      dest = globulize (argv[2]);
      if (!dest)
	{
	  code = -1;
	  return;
	}
      if (*dest != '|' && !confirm ("output to local-file:", dest))
	{
	  code = -1;
	  goto out;
	}
    }
  else
    dest = 0;

  recvrequest (cmd, dest ? dest : "-", argv[1], "w", 0);
out:
  free (dest);
}

/*
 * Get a directory listing
 * of multiple remote files.
 */
void
mls (int argc, char **argv)
{
  sighandler_t oldintr;
  int ointer, i;
  char *cmd, mode[1], *dest;

  if (argc < 2 && !another (&argc, &argv, "remote-files"))
    goto usage;
  if (argc < 3 && !another (&argc, &argv, "local-file"))
    {
    usage:
      printf ("usage: %s remote-files local-file\n", argv[0]);
      code = -1;
      return;
    }

  dest = argv[argc - 1];
  argv[argc - 1] = NULL;
  if (strcmp (dest, "-") && *dest != '|')
    {
      dest = globulize (dest);
      if (!dest)
	{
	  code = -1;
	  return;
	}
      if (!confirm ("output to local-file:", dest))
	{
	  code = -1;
	  free (dest);
	  return;
	}
    }
  else
    dest = strdup (dest);

  cmd = argv[0][1] == 'l' ? "NLST" : "LIST";
  mname = argv[0];
  mflag = 1;
  oldintr = signal (SIGINT, mabort);
  setjmp (jabort);
  for (i = 1; mflag && i < argc - 1; ++i)
    {
      *mode = (i == 1) ? 'w' : 'a';
      recvrequest (cmd, dest, argv[i], mode, 0);
      if (!mflag && fromatty)
	{
	  ointer = interactive;
	  interactive = 1;
	  if (confirm ("Continue with", argv[0]))
	    {
	      mflag++;
	    }
	  interactive = ointer;
	}
    }

  signal (SIGINT, oldintr);
  mflag = 0;
  free (dest);
}

/*
 * Do a shell escape
 */
void
shell (int argc, char **argv MAYBE_UNUSED)
{
  pid_t pid;
  sighandler_t old1, old2;
  char shellnam[40], *shell, *namep;

  old1 = signal (SIGINT, SIG_IGN);
  old2 = signal (SIGQUIT, SIG_IGN);
  if ((pid = fork ()) == 0)
    {
      for (pid = 3; pid < 20; pid++)
	close (pid);
      signal (SIGINT, SIG_DFL);
      signal (SIGQUIT, SIG_DFL);
      shell = getenv ("SHELL");
      if (shell == NULL)
	shell = PATH_BSHELL;
      namep = strrchr (shell, '/');
      if (namep == NULL)
	namep = shell;		/* No slash in this name.  */
      else
	namep++;		/* Skip the slash character.  */
      strcpy (shellnam, "-");
      strncat (shellnam, namep, sizeof (shellnam) - 2);
      if (strcmp (namep, "sh") != 0)
	shellnam[0] = '+';
      if (debug)
	{
	  printf ("%s\n", shell);
	  fflush (stdout);
	}
      if (argc > 1)
	{
	  execl (shell, shellnam, "-c", altarg, (char *) 0);
	}
      else
	{
	  execl (shell, shellnam, (char *) 0);
	}
      error (0, errno, "shell");
      code = -1;
      exit (EXIT_FAILURE);
    }
  if (pid > 0)
    while (wait (0) != pid)
      ;
  signal (SIGINT, old1);
  signal (SIGQUIT, old2);
  if (pid == -1)
    {
      error (0, errno, "Try again later");
      code = -1;
    }
  else
    {
      code = 0;
    }
}

/*
 * Send new user information (re-login)
 */
void
user (int argc, char **argv)
{
  char acct[80];
  int n, aflag = 0;

  if (argc < 2)
    another (&argc, &argv, "username");
  if (argc < 2 || argc > 4)
    {
      printf ("usage: %s username [password] [account]\n", argv[0]);
      code = -1;
      return;
    }
  n = command ("USER %s", argv[1]);
  if (n == CONTINUE)
    {
      /* Is this a case of challenge-response?
       * RFC 2228 stipulates code 336 for this.
       * Suppress message in verbose mode, since
       * it has already been displayed.
       */
      if (code == 336 && !verbose)
	printf ("%s\n", reply_string + strlen ("336 "));
      /* In addition, any password given on the
       * command line is irrelevant, so ignore it.
       */
      if (argc < 3 || code == 336)
	argv[2] = getpass ("Password: ");
      if (argc < 3)
	argc++;
      n = command ("PASS %s", argv[2]);
      if (argv[2])
	memset (argv[2], 0, strlen (argv[2]));
    }
  if (n == CONTINUE)
    {
      if (argc < 4)
	{
	  printf ("Account: ");
	  fflush (stdout);
	  if (fgets (acct, sizeof (acct) - 1, stdin))
	    acct[strlen (acct) - 1] = '\0';	/* Erase newline.  */
	  else
	    acct[0] = '\0';	/* Set empty name.  */
	  argv[3] = acct;
	  argc++;
	}
      n = command ("ACCT %s", argv[3]);
      aflag++;
    }
  if (n != COMPLETE)
    {
      fprintf (stdout, "Login failed.\n");
      return;
    }
  if (!aflag && argc == 4)
    {
      command ("ACCT %s", argv[3]);
    }
}

/*
 * Print working directory.
 */
void
pwd (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{
  int oldverbose = verbose;

  /*
   * If we aren't verbose, this doesn't do anything!
   */
  verbose = 1;
  if (command ("PWD") == ERROR && code == 500)
    {
      printf ("PWD command not recognized, trying XPWD\n");
      command ("XPWD");
    }
  verbose = oldverbose;
}

/*
 * Print local working directory.
 */
void
lpwd (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{
  char *dir = xgetcwd ();

  if (dir)
    {
      printf ("Local directory is %s\n", dir);
      free (dir);
    }
  else
    error (0, errno, "getcwd");

  code = 0;
}

/*
 * Make a directory.
 */
void
makedir (int argc, char **argv)
{

  if (argc < 2 && !another (&argc, &argv, "directory-name"))
    {
      printf ("usage: %s directory-name\n", argv[0]);
      code = -1;
      return;
    }
  if (command ("MKD %s", argv[1]) == ERROR && code == 500)
    {
      if (verbose)
	printf ("MKD command not recognized, trying XMKD\n");
      command ("XMKD %s", argv[1]);
    }
}

/*
 * Remove a directory.
 */
void
removedir (int argc, char **argv)
{

  if (argc < 2 && !another (&argc, &argv, "directory-name"))
    {
      printf ("usage: %s directory-name\n", argv[0]);
      code = -1;
      return;
    }
  if (command ("RMD %s", argv[1]) == ERROR && code == 500)
    {
      if (verbose)
	printf ("RMD command not recognized, trying XRMD\n");
      command ("XRMD %s", argv[1]);
    }
}

/*
 * Send a line, verbatim, to the remote machine.
 */
void
quote (int argc, char **argv)
{

  if (argc < 2 && !another (&argc, &argv, "command line to send"))
    {
      printf ("usage: %s line-to-send\n", argv[0]);
      code = -1;
      return;
    }
  quote1 ("", argc, argv);
}

/*
 * Send a SITE command to the remote machine.  The line
 * is sent verbatim to the remote machine, except that the
 * word "SITE" is added at the front.
 */
void
site (int argc, char **argv)
{

  if (argc < 2 && !another (&argc, &argv, "arguments to SITE command"))
    {
      printf ("usage: %s line-to-send\n", argv[0]);
      code = -1;
      return;
    }
  quote1 ("SITE ", argc, argv);
}

/*
 * Turn argv[1..argc) into a space-separated string, then prepend initial text.
 * Send the result as a one-line command and get response.
 */
void
quote1 (char *initial, int argc, char **argv)
{
  int i, len;
  char buf[BUFSIZ];		/* must be >= sizeof(line) */

  strcpy (buf, initial);
  if (argc > 1)
    {
      len = strlen (buf);
      len += strlen (strcpy (&buf[len], argv[1]));
      for (i = 2; i < argc; i++)
	{
	  buf[len++] = ' ';
	  len += strlen (strcpy (&buf[len], argv[i]));
	}
    }
  if (command (buf) == PRELIM)
    {
      while (getreply (0) == PRELIM)
	continue;
    }
}

void
do_chmod (int argc, char **argv)
{

  if (argc < 2 && !another (&argc, &argv, "mode"))
    goto usage;
  if (argc < 3 && !another (&argc, &argv, "file-name"))
    {
    usage:
      printf ("usage: %s mode file-name\n", argv[0]);
      code = -1;
      return;
    }
  command ("SITE CHMOD %s %s", argv[1], argv[2]);
}

void
do_umask (int argc, char **argv)
{
  int oldverbose = verbose;

  verbose = 1;
  command (argc == 1 ? "SITE UMASK" : "SITE UMASK %s", argv[1]);
  verbose = oldverbose;
}

void
site_idle (int argc, char **argv)
{
  int oldverbose = verbose;

  verbose = 1;
  command (argc == 1 ? "SITE IDLE" : "SITE IDLE %s", argv[1]);
  verbose = oldverbose;
}

/*
 * Ask the other side for help.
 */
void
rmthelp (int argc, char **argv)
{
  int oldverbose = verbose;

  verbose = 1;
  command (argc == 1 ? "HELP" : "HELP %s", argv[1]);
  verbose = oldverbose;
}

/*
 * Terminate session and exit.
 */
void
quit (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  if (connected)
    disconnect (0, 0);
  pswitch (1);
  if (connected)
    {
      disconnect (0, 0);
    }
  exit (EXIT_SUCCESS);
}

/*
 * Terminate session, but don't exit.
 */
void
disconnect (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  if (!connected)
    return;
  command ("QUIT");
  if (cout)
    {
      fclose (cout);
    }
  cout = NULL;
  connected = 0;
  data = -1;
  if (!proxy)
    {
      macnum = 0;
    }
}

int
confirm (char *cmd, char *file)
{
  char input[BUFSIZ];

  if (!interactive)
    return (1);
  printf ("%s %s? ", cmd, file);
  fflush (stdout);
  if (fgets (input, sizeof input, stdin) == NULL)
    return (0);
  return (*input != 'n' && *input != 'N');
}

void
fatal (char *msg)
{

  error (EXIT_FAILURE, 0, "%s", msg);
}

/*
 * Glob a local file name specification with
 * the expectation of a single return value.
 * Can't control multiple values being expanded
 * from the expression, we return only the first.
 */
char *
globulize (char *cp)
{
  glob_t gl;
  int flags;

  if (!doglob)
    return strdup (cp);

  flags = GLOB_BRACE | GLOB_NOCHECK | GLOB_TILDE;
#ifdef GLOB_QUOTE
  flags |= GLOB_QUOTE;
#endif

  memset (&gl, 0, sizeof (gl));
  if (glob (cp, flags, NULL, &gl) || gl.gl_pathc == 0)
    {
      error (0, 0, "%s: not found", cp);
      globfree (&gl);
      return (0);
    }

  cp = strdup (gl.gl_pathv[0]);
  globfree (&gl);

  return cp;
}

void
account (int argc, char **argv)
{
  char acct[50], *ap;

  if (argc > 1)
    {
      ++argv;
      --argc;
      strncpy (acct, *argv, sizeof (acct) - 1);
      acct[sizeof (acct) - 1] = '\0';
      while (argc > 1)
	{
	  --argc;
	  ++argv;
	  strncat (acct, *argv, (sizeof (acct) - 1) - strlen (acct));
	}
      ap = acct;
    }
  else
    {
      ap = getpass ("Account:");
    }
  command ("ACCT %s", ap);
  if (ap)
    memset (ap, 0, strlen (ap));
}

jmp_buf abortprox;

void
proxabort (int sig MAYBE_UNUSED)
{

  if (!proxy)
    {
      pswitch (1);
    }
  if (connected)
    {
      proxflag = 1;
    }
  else
    {
      proxflag = 0;
    }
  pswitch (0);
  longjmp (abortprox, 1);
}

void
doproxy (int argc, char **argv)
{
  struct cmd *c;
  sighandler_t oldintr;

  if (argc < 2 && !another (&argc, &argv, "command"))
    {
      printf ("usage: %s command\n", argv[0]);
      code = -1;
      return;
    }
  c = getcmd (argv[1]);
  if (c == (struct cmd *) -1)
    {
      printf ("?Ambiguous command\n");
      fflush (stdout);
      code = -1;
      return;
    }
  if (c == 0)
    {
      printf ("?Invalid command\n");
      fflush (stdout);
      code = -1;
      return;
    }
  if (!c->c_proxy)
    {
      printf ("?Invalid proxy command\n");
      fflush (stdout);
      code = -1;
      return;
    }
  if (setjmp (abortprox))
    {
      code = -1;
      return;
    }
  oldintr = signal (SIGINT, proxabort);
  pswitch (1);
  if (c->c_conn && !connected)
    {
      printf ("Not connected\n");
      fflush (stdout);
      pswitch (0);
      signal (SIGINT, oldintr);
      code = -1;
      return;
    }
  (*c->c_handler) (argc - 1, argv + 1);
  if (connected)
    {
      proxflag = 1;
    }
  else
    {
      proxflag = 0;
    }
  pswitch (0);
  signal (SIGINT, oldintr);
}

void
setcase (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  mcase = !mcase;
  printf ("Case mapping %s.\n", onoff (mcase));
  code = mcase;
}

void
setcr (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  crflag = !crflag;
  printf ("Carriage Return stripping %s.\n", onoff (crflag));
  code = crflag;
}

void
setntrans (int argc, char **argv)
{
  if (argc == 1)
    {
      ntflag = 0;
      printf ("Ntrans off.\n");
      code = ntflag;
      return;
    }
  ntflag++;
  code = ntflag;
  strncpy (ntin, argv[1], sizeof (ntin) - 1);
  ntin[sizeof (ntin) - 1] = '\0';
  if (argc == 2)
    {
      ntout[0] = '\0';
      return;
    }
  strncpy (ntout, argv[2], sizeof (ntout) - 1);
  ntout[sizeof (ntout) - 1] = '\0';
}

/* NOTE: dotrans() always returns a newly allocated string.
 */

char *
dotrans (char *name)
{
  char *new = xmalloc (strlen (name) + 1);
  char *cp1, *cp2 = new;
  size_t i, ostop, found;

  for (ostop = 0; *(ntout + ostop) && ostop < sizeof (ntout) - 1; ostop++)
    continue;
  for (cp1 = name; *cp1; cp1++)
    {
      found = 0;
      for (i = 0; *(ntin + i) && i < sizeof (ntin) - 1; i++)
	{
	  if (*cp1 == *(ntin + i))
	    {
	      found++;
	      if (i < ostop)
		{
		  *cp2++ = *(ntout + i);
		}
	      break;
	    }
	}
      if (!found)
	{
	  *cp2++ = *cp1;
	}
    }
  *cp2 = '\0';
  return (new);
}

void
setpassive (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  passivemode = !passivemode;
  printf ("Passive mode %s.\n", onoff (passivemode));
  code = passivemode;
}

void
setnmap (int argc, char **argv)
{
  char *cp;

  if (argc == 1)
    {
      mapflag = 0;
      printf ("Nmap off.\n");
      code = mapflag;
      return;
    }
  if (argc < 3 && !another (&argc, &argv, "mapout"))
    {
      printf ("Usage: %s [mapin mapout]\n", argv[0]);
      code = -1;
      return;
    }
  mapflag = 1;
  code = 1;
  cp = altarg;
  while (*cp && !isblank (*cp))
    cp++;
  if (proxy)
    {
      while (*cp && isblank (*cp))
	cp++;
      altarg = cp;
      while (*cp && !isblank (*cp))
	cp++;
    }
  *cp = '\0';

  free (mapin);
  mapin = strdup (altarg);

  do
    cp++;
  while (*cp && isblank (*cp));
  free (mapout);
  mapout = strdup (cp);
}

static int
cp_subst (char **from_p, char **to_p, int *toks, char **tp, char **te,
	  char *tok0, char **buf_p, int *buf_len_p)
{
  int toknum;
  char *src;
  size_t src_len;

  if (*++(*from_p) == '0')
    {
      src = tok0;
      src_len = strlen (tok0);
    }
  else if (toks[toknum = **from_p - '1'])
    {
      src = tp[toknum];
      src_len = te[toknum] - src;
    }
  else
    return 0;

  if (src_len > strlen ("$2"))
    {
      /* This substitution will be longer than the original text.
       * Allocate a larger buffer and update the cursor, pointing
       * within the new memory area.
       */
      size_t offset = *to_p - *buf_p;

      *buf_len_p += src_len - strlen ("$2");
      *buf_p = realloc (*buf_p, *buf_len_p);
      *to_p = *buf_p + offset;
    }

  while (src_len--)
    *(*to_p)++ = *src++;

  return 1;
}

/* NOTE: domap() can return a newly allocated string,
 * but need not do so every time.
 */

char *
domap (char *name)
{
  /* The string `mapout' will have its tokens expanded,
   * but is essentially the minimal output string.
   * Some brackets and some alternate strings might
   * need to be suppressed.
   */
  int buf_len = strlen (mapout) + 1;
  char *buf = xmalloc (buf_len);
  char *cp1 = name, *cp2 = mapin;
  char *tp[9], *te[9];
  int i, toks[9], toknum = 0, match = 1;

  for (i = 0; i < 9; ++i)
    {
      toks[i] = 0;
    }

  /* Tokenize the input pattern against incoming file name.
   */
  while (match && *cp1 && *cp2)
    {
      switch (*cp2)
	{
	case '\\':
	  if (*++cp2 != *cp1)
	    {
	      match = 0;
	    }
	  break;
	case '$':
	  if (*(cp2 + 1) >= '1' && (*cp2 + 1) <= '9')
	    {
	      if (*cp1 != *(++cp2 + 1))	/* Break at delimiter.  */
		{
		  toks[toknum = *cp2 - '1']++;
		  tp[toknum] = cp1;
		  while (*++cp1 && *(cp2 + 1) != *cp1)
		    ;
		  te[toknum] = cp1;
		}
	      cp2++;
	      break;
	    }
	  /* Fall through, as '$' must be used verbatim.  */
	  /* FALLTHROUGH */
	default:
	  if (*cp2 != *cp1)
	    {
	      match = 0;
	    }
	  break;
	}
      if (match && *cp1)
	{
	  cp1++;
	}
      if (match && *cp2)
	{
	  cp2++;
	}
    }
  if (!match && *cp1)		/* last token mismatch */
    {
      toks[toknum] = 0;
    }

  /* Back substitute tokens into output template
   * string `mapout'.  All fixed characters were
   * already accounted for in presetting BUF_LEN.
   */
  cp1 = buf;
  *cp1 = '\0';
  cp2 = mapout;
  while (*cp2)
    {
      match = 0;
      switch (*cp2)
	{
	case '\\':
	  if (*(cp2 + 1))
	    {
	      *cp1++ = *++cp2;
	    }
	  break;
	case '[':
	LOOP:
	  if (*++cp2 == '$' && isdigit (*(cp2 + 1)))
	    {
	      if (cp_subst (&cp2, &cp1, toks, tp, te, name, &buf, &buf_len))
		match = 1;
	    }
	  else
	    {
	      while (*cp2 && *cp2 != ',' && *cp2 != ']')
		{
		  if (*cp2 == '\\')
		    {
		      cp2++;
		    }
		  else if (*cp2 == '$' && isdigit (*(cp2 + 1)))
		    {
		      if (cp_subst (&cp2,
				    &cp1, toks, tp, te, name, &buf, &buf_len))
			match = 1;
		    }
		  else if (*cp2)
		    *cp1++ = *cp2++;
		}
	      if (!*cp2)
		{
		  printf ("nmap: unbalanced brackets\n");
		  return (name);
		}
	      match = 1;
	      cp2--;
	    }
	  if (match)
	    {
	      /* Skip over all alternate text.  */
	      while (*++cp2 && *cp2 != ']')
		{
		  if (*cp2 == '\\' && *(cp2 + 1))
		    {
		      cp2++;
		    }
		}
	      if (!*cp2)
		{
		  printf ("nmap: unbalanced brackets\n");
		  return (name);
		}
	      break;
	    }
	  switch (*++cp2)
	    {
	    case ',':
	      goto LOOP;
	    case ']':
	      break;
	    default:
	      cp2--;
	      goto LOOP;
	    }
	  break;
	case '$':
	  if (isdigit (*(cp2 + 1)))
	    {
	      if (cp_subst (&cp2, &cp1, toks, tp, te, name, &buf, &buf_len))
		match = 1;
	      break;
	    }
	  /* intentional fall through */
	default:
	  *cp1++ = *cp2;
	  break;
	}
      cp2++;
    }
  *cp1 = '\0';

  if (!*buf)
    strcpy (buf, name);

  return buf;
}

void
setsunique (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  sunique = !sunique;
  printf ("Store unique %s.\n", onoff (sunique));
  code = sunique;
}

void
setrunique (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  runique = !runique;
  printf ("Receive unique %s.\n", onoff (runique));
  code = runique;
}

/* change directory to parent directory */
void
cdup (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  if (command ("CDUP") == ERROR && code == 500)
    {
      if (verbose)
	printf ("CDUP command not recognized, trying XCUP\n");
      command ("XCUP");
    }
}

/* restart transfer at specific point */
void
restart (int argc, char **argv)
{

  if (argc != 2)
    printf ("restart: offset not specified\n");
  else
    {
      restart_point = atoll (argv[1]);
      printf ("restarting at %jd. %s\n", (intmax_t) restart_point,
	      "execute get, put or append to initiate transfer");
    }
}

/* show remote system type */
void
syst (int argc MAYBE_UNUSED, char **argv MAYBE_UNUSED)
{

  command ("SYST");
}

void
macdef (int argc, char **argv)
{
  char *tmp;
  int c;

  if (macnum == 16)
    {
      printf ("Limit of 16 macros have already been defined\n");
      code = -1;
      return;
    }
  if (argc < 2 && !another (&argc, &argv, "macro name"))
    {
      printf ("Usage: %s macro_name\n", argv[0]);
      code = -1;
      return;
    }
  if (interactive)
    {
      printf ("Enter macro line by line, terminating it with a null line\n");
    }
  strncpy (macros[macnum].mac_name, argv[1],
	   sizeof (macros[macnum].mac_name) - 1);
  if (macnum == 0)
    {
      macros[macnum].mac_start = macbuf;
    }
  else
    {
      macros[macnum].mac_start = macros[macnum - 1].mac_end + 1;
    }
  tmp = macros[macnum].mac_start;
  while (tmp < macbuf + sizeof (macbuf))
    {
      if ((c = getchar ()) == EOF)
	{
	  printf ("macdef:end of file encountered\n");
	  code = -1;
	  return;
	}
      if ((*tmp = c) == '\n')
	{
	  if (tmp == macros[macnum].mac_start)
	    {
	      macros[macnum++].mac_end = tmp;
	      code = 0;
	      return;
	    }
	  if (*(tmp - 1) == '\0')
	    {
	      macros[macnum++].mac_end = tmp - 1;
	      code = 0;
	      return;
	    }
	  *tmp = '\0';
	}
      tmp++;
    }
  while (1)
    {
      while ((c = getchar ()) != '\n' && c != EOF)
	/* LOOP */ ;
      if (c == EOF || getchar () == '\n')
	{
	  printf ("Macro not defined - 4k buffer exceeded\n");
	  code = -1;
	  return;
	}
    }
}

/*
 * get size of file on remote machine
 */
void
sizecmd (int argc, char **argv)
{

  if (argc < 2 && !another (&argc, &argv, "filename"))
    {
      printf ("usage: %s filename\n", argv[0]);
      code = -1;
      return;
    }
  command ("SIZE %s", argv[1]);
}

/*
 * get last modification time of file on remote machine
 */
void
modtime (int argc, char **argv)
{
  int overbose;

  if (argc < 2 && !another (&argc, &argv, "filename"))
    {
      printf ("usage: %s filename\n", argv[0]);
      code = -1;
      return;
    }
  overbose = verbose;
  if (debug == 0)
    verbose = -1;
  if (command ("MDTM %s", argv[1]) == COMPLETE)
    {
      int yy, mo, day, hour, min, sec;
      sscanf (reply_string, "%*s %04d%02d%02d%02d%02d%02d", &yy, &mo,
	      &day, &hour, &min, &sec);
      /* might want to print this in local time */
      printf ("%s\t%02d/%02d/%04d %02d:%02d:%02d GMT\n", argv[1],
	      mo, day, yy, hour, min, sec);
    }
  else
    printf ("%s\n", reply_string);
  verbose = overbose;
}

/*
 * show status on remote machine
 */
void
rmtstatus (int argc, char **argv)
{

  command (argc > 1 ? "STAT %s" : "STAT", argv[1]);
}

/*
 * get file if modtime is more recent than current file
 */
void
newer (int argc, char **argv)
{

  if (getit (argc, argv, -1, "w"))
    printf ("Local file \"%s\" is newer than remote file \"%s\"\n",
	    argv[2], argv[1]);
}