text: /*	$NetBSD: ftp.c,v 1.164 2012/07/04 06:09:37 is Exp $	*/
  
  /*-
   * Copyright (c) 1996-2009 The NetBSD Foundation, Inc.
   * All rights reserved.
   *
   * This code is derived from software contributed to The NetBSD Foundation
   * by Luke Mewburn.
   *
   * 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.
   *
   * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
   */
  
  /*
   * 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.
   */
  
  /*
   * Copyright (C) 1997 and 1998 WIDE Project.
   * 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 project 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 PROJECT 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 PROJECT 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 <sys/cdefs.h>
  #ifndef lint
  #if 0
  static char sccsid[] = "@(#)ftp.c	8.6 (Berkeley) 10/27/94";
  #else
  __RCSID("$NetBSD: ftp.c,v 1.164 2012/07/04 06:09:37 is Exp $");
  #endif
  #endif /* not lint */
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <sys/socket.h>
  #include <sys/time.h>
  
  #include <netinet/in.h>
  #include <netinet/in_systm.h>
  #include <netinet/ip.h>
  #include <arpa/inet.h>
  #include <arpa/ftp.h>
  #include <arpa/telnet.h>
  
  #include <assert.h>
  #include <ctype.h>
  #include <err.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <netdb.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <time.h>
  #include <unistd.h>
  #include <stdarg.h>
  
  #include "ftp_var.h"
  
  volatile sig_atomic_t	abrtflag;
  volatile sig_atomic_t	timeoutflag;
  
  sigjmp_buf	ptabort;
  int	ptabflg;
  int	ptflag = 0;
  char	pasv[BUFSIZ];	/* passive port for proxy data connection */
  
  static int empty(FILE *, FILE *, int);
  __dead static void abort_squared(int);
  
  struct sockinet {
  	union sockunion {
  		struct sockaddr_in  su_sin;
  #ifdef INET6
  		struct sockaddr_in6 su_sin6;
  #endif
  	} si_su;
  #if !defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN)
  	int	si_len;
  #endif
  };
  
  #if !defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN)
  # define su_len		si_len
  #else
  # define su_len		si_su.su_sin.sin_len
  #endif
  #define su_family	si_su.su_sin.sin_family
  #define su_port		si_su.su_sin.sin_port
  
  struct sockinet myctladdr, hisctladdr, data_addr;
  
  char *
  hookup(const char *host, const char *port)
  {
  	int s = -1, error;
  	struct addrinfo hints, *res, *res0;
  	static char hostnamebuf[MAXHOSTNAMELEN];
  	socklen_t len;
  	int on = 1;
  
  	memset((char *)&hisctladdr, 0, sizeof (hisctladdr));
  	memset((char *)&myctladdr, 0, sizeof (myctladdr));
  	memset(&hints, 0, sizeof(hints));
  	hints.ai_flags = AI_CANONNAME;
  	hints.ai_family = family;
  	hints.ai_socktype = SOCK_STREAM;
  	hints.ai_protocol = 0;
  	error = getaddrinfo(host, port, &hints, &res0);
  	if (error) {
  		warnx("Can't lookup `%s:%s': %s", host, port,
  		    (error == EAI_SYSTEM) ? strerror(errno)
  					  : gai_strerror(error));
  		code = -1;
  		return (0);
  	}
  
  	if (res0->ai_canonname)
  		(void)strlcpy(hostnamebuf, res0->ai_canonname,
  		    sizeof(hostnamebuf));
  	else
  		(void)strlcpy(hostnamebuf, host, sizeof(hostnamebuf));
  	hostname = hostnamebuf;
  
  	for (res = res0; res; res = res->ai_next) {
  		char hname[NI_MAXHOST], sname[NI_MAXSERV];
  
  		ai_unmapped(res);
  		if (getnameinfo(res->ai_addr, res->ai_addrlen,
  		    hname, sizeof(hname), sname, sizeof(sname),
  		    NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
  			strlcpy(hname, "?", sizeof(hname));
  			strlcpy(sname, "?", sizeof(sname));
  		}
  		if (verbose && res0->ai_next) {
  				/* if we have multiple possibilities */
  			fprintf(ttyout, "Trying %s:%s ...\n", hname, sname);
  		}
  		s = socket(res->ai_family, SOCK_STREAM, res->ai_protocol);
  		if (s < 0) {
  			warn("Can't create socket for connection to `%s:%s'",
  			    hname, sname);
  			continue;
  		}
  		if (ftp_connect(s, res->ai_addr, res->ai_addrlen,
  		    verbose || !res->ai_next) < 0) {
  			close(s);
  			s = -1;
  			continue;
  		}
  
  		/* finally we got one */
  		break;
  	}
  	if (s < 0) {
  		warnx("Can't connect to `%s:%s'", host, port);
  		code = -1;
  		freeaddrinfo(res0);
  		return 0;
  	}
  	memcpy(&hisctladdr.si_su, res->ai_addr, res->ai_addrlen);
  	hisctladdr.su_len = res->ai_addrlen;
  	freeaddrinfo(res0);
  	res0 = res = NULL;
  
  	len = hisctladdr.su_len;
  	if (getsockname(s, (struct sockaddr *)&myctladdr.si_su, &len) == -1) {
  		warn("Can't determine my address of connection to `%s:%s'",
  		    host, port);
  		code = -1;
  		goto bad;
  	}
  	myctladdr.su_len = len;
  
  #ifdef IPTOS_LOWDELAY
  	if (hisctladdr.su_family == AF_INET) {
  		int tos = IPTOS_LOWDELAY;
  		if (setsockopt(s, IPPROTO_IP, IP_TOS,
  				(void *)&tos, sizeof(tos)) == -1) {
  				DWARN("setsockopt %s (ignored)",
  				    "IPTOS_LOWDELAY");
  		}
  	}
  #endif
  	cin = fdopen(s, "r");
  	cout = fdopen(s, "w");
  	if (cin == NULL || cout == NULL) {
  		warnx("Can't fdopen socket");
  		if (cin)
  			(void)fclose(cin);
  		if (cout)
  			(void)fclose(cout);
  		code = -1;
  		goto bad;
  	}
  	if (verbose)
  		fprintf(ttyout, "Connected to %s.\n", hostname);
  	if (getreply(0) > 2) {	/* read startup message from server */
  		if (cin)
  			(void)fclose(cin);
  		if (cout)
  			(void)fclose(cout);
  		code = -1;
  		goto bad;
  	}
  
  	if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE,
  			(void *)&on, sizeof(on)) == -1) {
  		DWARN("setsockopt %s (ignored)", "SO_OOBINLINE");
  	}
  
  	return (hostname);
   bad:
  	(void)close(s);
  	return (NULL);
  }
  
  void
  cmdabort(int notused)
  {
  	int oerrno = errno;
  
  	sigint_raised = 1;
  	alarmtimer(0);
  	if (fromatty)
  		write(fileno(ttyout), "\n", 1);
  	abrtflag++;
  	if (ptflag)
  		siglongjmp(ptabort, 1);
  	errno = oerrno;
  }
  
  void
  cmdtimeout(int notused)
  {
  	int oerrno = errno;
  
  	alarmtimer(0);
  	if (fromatty)
  		write(fileno(ttyout), "\n", 1);
  	timeoutflag++;
  	if (ptflag)
  		siglongjmp(ptabort, 1);
  	errno = oerrno;
  }
  
  /*VARARGS*/
  int
  command(const char *fmt, ...)
  {
  	va_list ap;
  	int r;
  	sigfunc oldsigint;
  
  #ifndef NO_DEBUG
  	if (ftp_debug) {
  		fputs("---> ", ttyout);
  		va_start(ap, fmt);
  		if (strncmp("PASS ", fmt, 5) == 0)
  			fputs("PASS XXXX", ttyout);
  		else if (strncmp("ACCT ", fmt, 5) == 0)
  			fputs("ACCT XXXX", ttyout);
  		else
  			vfprintf(ttyout, fmt, ap);
  		va_end(ap);
  		putc('\n', ttyout);
  	}
  #endif
  	if (cout == NULL) {
  		warnx("No control connection for command");
  		code = -1;
  		return (0);
  	}
  
  	abrtflag = 0;
  
  	oldsigint = xsignal(SIGINT, cmdabort);
  
  	va_start(ap, fmt);
  	vfprintf(cout, fmt, ap);
  	va_end(ap);
  	fputs("\r\n", cout);
  	(void)fflush(cout);
  	cpend = 1;
  	r = getreply(!strcmp(fmt, "QUIT"));
  	if (abrtflag && oldsigint != SIG_IGN)
  		(*oldsigint)(SIGINT);
  	(void)xsignal(SIGINT, oldsigint);
  	return (r);
  }
  
  static const char *m421[] = {
  	"remote server timed out. Connection closed",
  	"user interrupt. Connection closed",
  	"remote server has closed connection",
  };
  
  int
  getreply(int expecteof)
  {
  	char current_line[BUFSIZ];	/* last line of previous reply */
  	int c, n, lineno;
  	int dig;
  	int originalcode = 0, continuation = 0;
  	sigfunc oldsigint, oldsigalrm;
  	int pflag = 0;
  	char *cp, *pt = pasv;
  
  	abrtflag = 0;
  	timeoutflag = 0;
  
  	oldsigint = xsignal(SIGINT, cmdabort);
  	oldsigalrm = xsignal(SIGALRM, cmdtimeout);
  
  	for (lineno = 0 ;; lineno++) {
  		dig = n = code = 0;
  		cp = current_line;
  		while (alarmtimer(quit_time ? quit_time : 60),
  		       ((c = getc(cin)) != '\n')) {
  			if (c == IAC) {     /* handle telnet commands */
  				switch (c = getc(cin)) {
  				case WILL:
  				case WONT:
  					c = getc(cin);
  					fprintf(cout, "%c%c%c", IAC, DONT, c);
  					(void)fflush(cout);
  					break;
  				case DO:
  				case DONT:
  					c = getc(cin);
  					fprintf(cout, "%c%c%c", IAC, WONT, c);
  					(void)fflush(cout);
  					break;
  				default:
  					break;
  				}
  				continue;
  			}
  			dig++;
  			if (c == EOF) {
  				/*
  				 * these will get trashed by pswitch()
  				 * in lostpeer()
  				 */
  				int reply_timeoutflag = timeoutflag;
  				int reply_abrtflag = abrtflag;
  
  				alarmtimer(0);
  				if (expecteof && feof(cin)) {
  					(void)xsignal(SIGINT, oldsigint);
  					(void)xsignal(SIGALRM, oldsigalrm);
  					code = 221;
  					return (0);
  				}
  				cpend = 0;
  				lostpeer(0);
  				if (verbose) {
  					size_t midx;
  					if (reply_timeoutflag)
  						midx = 0;
  					else if (reply_abrtflag)
  						midx = 1;
  					else
  						midx = 2;
  					(void)fprintf(ttyout,
  			    "421 Service not available, %s.\n", m421[midx]);
  					(void)fflush(ttyout);
  				}
  				code = 421;
  				(void)xsignal(SIGINT, oldsigint);
  				(void)xsignal(SIGALRM, oldsigalrm);
  				return (4);
  			}
  			if (c != '\r' && (verbose > 0 ||
  			    ((verbose > -1 && n == '5' && dig > 4) &&
  			    (((!n && c < '5') || (n && n < '5'))
  			     || !retry_connect)))) {
  				if (proxflag &&
  				   (dig == 1 || (dig == 5 && verbose == 0)))
  					fprintf(ttyout, "%s:", hostname);
  				(void)putc(c, ttyout);
  			}
  			if (dig < 4 && isdigit(c))
  				code = code * 10 + (c - '0');
  			if (!pflag && (code == 227 || code == 228))
  				pflag = 1;
  			else if (!pflag && code == 229)
  				pflag = 100;
  			if (dig > 4 && pflag == 1 && isdigit(c))
  				pflag = 2;
  			if (pflag == 2) {
  				if (c != '\r' && c != ')') {
  					if (pt < &pasv[sizeof(pasv) - 1])
  						*pt++ = c;
  				} else {
  					*pt = '\0';
  					pflag = 3;
  				}
  			}
  			if (pflag == 100 && c == '(')
  				pflag = 2;
  			if (dig == 4 && c == '-') {
  				if (continuation)
  					code = 0;
  				continuation++;
  			}
  			if (n == 0)
  				n = c;
  			if (cp < &current_line[sizeof(current_line) - 1])
  				*cp++ = c;
  		}
  		if (verbose > 0 || ((verbose > -1 && n == '5') &&
  		    (n < '5' || !retry_connect))) {
  			(void)putc(c, ttyout);
  			(void)fflush(ttyout);
  		}
  		if (cp[-1] == '\r')
  			cp[-1] = '\0';
  		*cp = '\0';
  		if (lineno == 0)
  			(void)strlcpy(reply_string, current_line,
  			    sizeof(reply_string));
  		if (lineno > 0 && code == 0 && reply_callback != NULL)
  			(*reply_callback)(current_line);
  		if (continuation && code != originalcode) {
  			if (originalcode == 0)
  				originalcode = code;
  			continue;
  		}
  		if (n != '1')
  			cpend = 0;
  		alarmtimer(0);
  		(void)xsignal(SIGINT, oldsigint);
  		(void)xsignal(SIGALRM, oldsigalrm);
  		if (code == 421 || originalcode == 421)
  			lostpeer(0);
  		if (abrtflag && oldsigint != cmdabort && oldsigint != SIG_IGN)
  			(*oldsigint)(SIGINT);
  		if (timeoutflag && oldsigalrm != cmdtimeout &&
  		    oldsigalrm != SIG_IGN)
  			(*oldsigalrm)(SIGINT);
  		return (n - '0');
  	}
  }
  
  static int
  empty(FILE *ecin, FILE *din, int sec)
  {
  	int		nr, nfd;
  	struct pollfd	pfd[2];
  
  	nfd = 0;
  	if (ecin) {
  		pfd[nfd].fd = fileno(ecin);
  		pfd[nfd++].events = POLLIN;
  	}
  
  	if (din) {
  		pfd[nfd].fd = fileno(din);
  		pfd[nfd++].events = POLLIN;
  	}
  
  	if ((nr = ftp_poll(pfd, nfd, sec * 1000)) <= 0)
  		return nr;
  
  	nr = 0;
  	nfd = 0;
  	if (ecin)
  		nr |= (pfd[nfd++].revents & POLLIN) ? 1 : 0;
  	if (din)
  		nr |= (pfd[nfd++].revents & POLLIN) ? 2 : 0;
  	return nr;
  }
  
  sigjmp_buf	xferabort;
  
  __dead static void
  abortxfer(int notused)
  {
  	char msgbuf[100];
  	size_t len;
  
  	sigint_raised = 1;
  	alarmtimer(0);
  	mflag = 0;
  	abrtflag = 0;
  	switch (direction[0]) {
  	case 'r':
  		strlcpy(msgbuf, "\nreceive", sizeof(msgbuf));
  		break;
  	case 's':
  		strlcpy(msgbuf, "\nsend", sizeof(msgbuf));
  		break;
  	default:
  		errx(1, "abortxfer: unknown direction `%s'", direction);
  	}
  	len = strlcat(msgbuf, " aborted. Waiting for remote to finish abort.\n",
  	    sizeof(msgbuf));
  	write(fileno(ttyout), msgbuf, len);
  	siglongjmp(xferabort, 1);
  }
  
  /*
   * Read data from infd & write to outfd, using buf/bufsize as the temporary
   * buffer, dealing with short writes.
   * If rate_limit != 0, rate-limit the transfer.
   * If hash_interval != 0, fputc('c', ttyout) every hash_interval bytes.
   * Updates global variables: bytes.
   * Returns 0 if ok, 1 if there was a read error, 2 if there was a write error.
   * In the case of error, errno contains the appropriate error code.
   */
  static int
  copy_bytes(int infd, int outfd, char *buf, size_t bufsize,
  	int rate_limit, int hash_interval)
  {
  	volatile off_t	hashc;
  	ssize_t		inc, outc;
  	char		*bufp;
  	struct timeval	tvthen, tvnow, tvdiff;
  	off_t		bufrem, bufchunk;
  	int		serr;
  
  	hashc = hash_interval;
  	if (rate_limit)
  		bufchunk = rate_limit;
  	else
  		bufchunk = bufsize;
  
  	while (1) {
  		if (rate_limit) {
  			(void)gettimeofday(&tvthen, NULL);
  		}
  		errno = 0;
  		inc = outc = 0;
  					/* copy bufchunk at a time */
  		bufrem = bufchunk;
  		while (bufrem > 0) {
  			inc = read(infd, buf, MIN((off_t)bufsize, bufrem));
  			if (inc <= 0)
  				goto copy_done;
  			bytes += inc;
  			bufrem -= inc;
  			bufp = buf;
  			while (inc > 0) {
  				outc = write(outfd, bufp, inc);
  				if (outc < 0)
  					goto copy_done;
  				inc -= outc;
  				bufp += outc;
  			}
  			if (hash_interval) {
  				while (bytes >= hashc) {
  					(void)putc('#', ttyout);
  					hashc += hash_interval;
  				}
  				(void)fflush(ttyout);
  			}
  		}
  		if (rate_limit) {	/* rate limited; wait if necessary */
  			while (1) {
  				(void)gettimeofday(&tvnow, NULL);
  				timersub(&tvnow, &tvthen, &tvdiff);
  				if (tvdiff.tv_sec > 0)
  					break;
  				usleep(1000000 - tvdiff.tv_usec);
  			}
  		}
  	}
  
   copy_done:
  	serr = errno;
  	if (hash_interval && bytes > 0) {
  		if (bytes < hash_interval)
  			(void)putc('#', ttyout);
  		(void)putc('\n', ttyout);
  		(void)fflush(ttyout);
  	}
  	errno = serr;
  	if (inc == -1)
  		return 1;
  	if (outc == -1)
  		return 2;
  
  	return 0;
  }
  
  void
  sendrequest(const char *cmd, const char *local, const char *remote,
  	    int printnames)
  {
  	struct stat st;
  	int c;
  	FILE *volatile fin;
  	FILE *volatile dout;
  	int (*volatile closefunc)(FILE *);
  	sigfunc volatile oldintr;
  	sigfunc volatile oldintp;
  	off_t volatile hashbytes;
  	int hash_interval;
  	const char *lmode;
  	static size_t bufsize;
  	static char *buf;
  	int oprogress;
  
  	hashbytes = mark;
  	direction = "sent";
  	dout = NULL;
  	bytes = 0;
  	filesize = -1;
  	oprogress = progress;
  	if (verbose && printnames) {
  		if (*local != '-')
  			fprintf(ttyout, "local: %s ", local);
  		if (remote)
  			fprintf(ttyout, "remote: %s\n", remote);
  	}
  	if (proxy) {
  		proxtrans(cmd, local, remote);
  		return;
  	}
  	if (curtype != type)
  		changetype(type, 0);
  	closefunc = NULL;
  	oldintr = NULL;
  	oldintp = NULL;
  	lmode = "w";
  	if (sigsetjmp(xferabort, 1)) {
  		while (cpend)
  			(void)getreply(0);
  		code = -1;
  		goto cleanupsend;
  	}
  	(void)xsignal(SIGQUIT, psummary);
  	oldintr = xsignal(SIGINT, abortxfer);
  	if (strcmp(local, "-") == 0) {
  		fin = stdin;
  		progress = 0;
  	} else if (*local == '|') {
  		oldintp = xsignal(SIGPIPE, SIG_IGN);
  		fin = popen(local + 1, "r");
  		if (fin == NULL) {
  			warn("Can't execute `%s'", local + 1);
  			code = -1;
  			goto cleanupsend;
  		}
  		progress = 0;
  		closefunc = pclose;
  	} else {
  		fin = fopen(local, "r");
  		if (fin == NULL) {
  			warn("Can't open `%s'", local);
  			code = -1;
  			goto cleanupsend;
  		}
  		closefunc = fclose;
  		if (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode)) {
  			fprintf(ttyout, "%s: not a plain file.\n", local);
  			code = -1;
  			goto cleanupsend;
  		}
  		filesize = st.st_size;
  	}
  	if (initconn()) {
  		code = -1;
  		goto cleanupsend;
  	}
  	if (sigsetjmp(xferabort, 1))
  		goto abort;
  
  	if (restart_point &&
  	    (strcmp(cmd, "STOR") == 0 || strcmp(cmd, "APPE") == 0)) {
  		int rc;
  
  		rc = -1;
  		switch (curtype) {
  		case TYPE_A:
  			rc = fseeko(fin, restart_point, SEEK_SET);
  			break;
  		case TYPE_I:
  		case TYPE_L:
  			rc = lseek(fileno(fin), restart_point, SEEK_SET);
  			break;
  		}
  		if (rc < 0) {
  			warn("Can't seek to restart `%s'", local);
  			goto cleanupsend;
  		}
  		if (command("REST " LLF, (LLT)restart_point) != CONTINUE)
  			goto cleanupsend;
  		lmode = "r+";
  	}
  	if (remote) {
  		if (command("%s %s", cmd, remote) != PRELIM)
  			goto cleanupsend;
  	} else {
  		if (command("%s", cmd) != PRELIM)
  			goto cleanupsend;
  	}
  	dirchange = 1;
  	dout = dataconn(lmode);
  	if (dout == NULL)
  		goto abort;
  
  	assert(sndbuf_size > 0);
  	if ((size_t)sndbuf_size > bufsize) {
  		if (buf)
  			(void)free(buf);
  		bufsize = sndbuf_size;
  		buf = ftp_malloc(bufsize);
  	}
  
  	progressmeter(-1);
  	oldintp = xsignal(SIGPIPE, SIG_IGN);
  	hash_interval = (hash && (!progress || filesize < 0)) ? mark : 0;
  
  	switch (curtype) {
  
  	case TYPE_I:
  	case TYPE_L:
  		c = copy_bytes(fileno(fin), fileno(dout), buf, bufsize,
  			       rate_put, hash_interval);
  		if (c == 1) {
  			warn("Reading `%s'", local);
  		} else if (c == 2) {
  			if (errno != EPIPE)
  				warn("Writing to network");
  			bytes = -1;
  		}
  		break;
  
  	case TYPE_A:
  		while ((c = getc(fin)) != EOF) {
  			if (c == '\n') {
  				while (hash_interval && bytes >= hashbytes) {
  					(void)putc('#', ttyout);
  					(void)fflush(ttyout);
  					hashbytes += mark;
  				}
  				if (ferror(dout))
  					break;
  				(void)putc('\r', dout);
  				bytes++;
  			}
  			(void)putc(c, dout);
  			bytes++;
  #if 0	/* this violates RFC 959 */
  			if (c == '\r') {
  				(void)putc('\0', dout);
  				bytes++;
  			}
  #endif
  		}
  		if (hash_interval) {
  			if (bytes < hashbytes)
  				(void)putc('#', ttyout);
  			(void)putc('\n', ttyout);
  		}
  		if (ferror(fin))
  			warn("Reading `%s'", local);
  		if (ferror(dout)) {
  			if (errno != EPIPE)
  				warn("Writing to network");
  			bytes = -1;
  		}
  		break;
  	}
  
  	progressmeter(1);
  	if (closefunc != NULL) {
  		(*closefunc)(fin);
  		fin = NULL;
  	}
  	(void)fclose(dout);
  	dout = NULL;
  	(void)getreply(0);
  	if (bytes > 0)
  		ptransfer(0);
  	goto cleanupsend;
  
   abort:
  	(void)xsignal(SIGINT, oldintr);
  	oldintr = NULL;
  	if (!cpend) {
  		code = -1;
  		goto cleanupsend;
  	}
  	if (data >= 0) {
  		(void)close(data);
  		data = -1;
  	}
  	if (dout) {
  		(void)fclose(dout);
  		dout = NULL;
  	}
  	(void)getreply(0);
  	code = -1;
  	if (bytes > 0)
  		ptransfer(0);
  
   cleanupsend:
  	if (oldintr)
  		(void)xsignal(SIGINT, oldintr);
  	if (oldintp)
  		(void)xsignal(SIGPIPE, oldintp);
  	if (data >= 0) {
  		(void)close(data);
  		data = -1;
  	}
  	if (closefunc != NULL && fin != NULL)
  		(*closefunc)(fin);
  	if (dout)
  		(void)fclose(dout);
  	progress = oprogress;
  	restart_point = 0;
  	bytes = 0;
  }
  
  void
  recvrequest(const char *cmd, const char *volatile local, const char *remote,
  	    const char *lmode, int printnames, int ignorespecial)
  {
  	FILE *volatile fout;
  	FILE *volatile din;
  	int (*volatile closefunc)(FILE *);
  	sigfunc volatile oldintr;
  	sigfunc volatile oldintp;
  	int c, d;
  	int volatile is_retr;
  	int volatile tcrflag;
  	int volatile bare_lfs;
  	static size_t bufsize;
  	static char *buf;
  	off_t volatile hashbytes;
  	int hash_interval;
  	struct stat st;
  	time_t mtime;
  	struct timeval tval[2];
  	int oprogress;
  	int opreserve;
  
  	fout = NULL;
  	din = NULL;
  	hashbytes = mark;
  	direction = "received";
  	bytes = 0;
  	bare_lfs = 0;
  	filesize = -1;
  	oprogress = progress;
  	opreserve = preserve;
  	is_retr = (strcmp(cmd, "RETR") == 0);
  	if (is_retr && verbose && printnames) {
  		if (ignorespecial || *local != '-')
  			fprintf(ttyout, "local: %s ", local);
  		if (remote)
  			fprintf(ttyout, "remote: %s\n", remote);
  	}
  	if (proxy && is_retr) {
  		proxtrans(cmd, local, remote);
  		return;
  	}
  	closefunc = NULL;
  	oldintr = NULL;
  	oldintp = NULL;
  	tcrflag = !crflag && is_retr;
  	if (sigsetjmp(xferabort, 1)) {
  		while (cpend)
  			(void)getreply(0);
  		code = -1;
  		goto cleanuprecv;
  	}
  	(void)xsignal(SIGQUIT, psummary);
  	oldintr = xsignal(SIGINT, abortxfer);
  	if (ignorespecial || (strcmp(local, "-") && *local != '|')) {
  		if (access(local, W_OK) < 0) {
  			char *dir = strrchr(local, '/');
  
  			if (errno != ENOENT && errno != EACCES) {
  				warn("Can't access `%s'", local);
  				code = -1;
  				goto cleanuprecv;
  			}
  			if (dir != NULL)
  				*dir = 0;
  			d = access(dir == local ? "/" :
  			    dir ? local : ".", W_OK);
  			if (dir != NULL)
  				*dir = '/';
  			if (d < 0) {
  				warn("Can't access `%s'", local);
  				code = -1;
  				goto cleanuprecv;
  			}
  			if (!runique && errno == EACCES &&
  			    chmod(local, (S_IRUSR|S_IWUSR)) < 0) {
  				warn("Can't chmod `%s'", local);
  				code = -1;
  				goto cleanuprecv;
  			}
  			if (runique && errno == EACCES &&
  			   (local = gunique(local)) == NULL) {
  				code = -1;
  				goto cleanuprecv;
  			}
  		}
  		else if (runique && (local = gunique(local)) == NULL) {
  			code = -1;
  			goto cleanuprecv;
  		}
  	}
  	if (!is_retr) {
  		if (curtype != TYPE_A)
  			changetype(TYPE_A, 0);
  	} else {
  		if (curtype != type)
  			changetype(type, 0);
  		filesize = remotesize(remote, 0);
  		if (code == 421 || code == -1)
  			goto cleanuprecv;
  	}
  	if (initconn()) {
  		code = -1;
  		goto cleanuprecv;
  	}
  	if (sigsetjmp(xferabort, 1))
  		goto abort;
  	if (is_retr && restart_point &&
  	    command("REST " LLF, (LLT) restart_point) != CONTINUE)
  		goto cleanuprecv;
  	if (! EMPTYSTRING(remote)) {
  		if (command("%s %s", cmd, remote) != PRELIM)
  			goto cleanuprecv;
  	} else {
  		if (command("%s", cmd) != PRELIM)
  			goto cleanuprecv;
  	}
  	din = dataconn("r");
  	if (din == NULL)
  		goto abort;
  	if (!ignorespecial && strcmp(local, "-") == 0) {
  		fout = stdout;
  		progress = 0;
  		preserve = 0;
  	} else if (!ignorespecial && *local == '|') {
  		oldintp = xsignal(SIGPIPE, SIG_IGN);
  		fout = popen(local + 1, "w");
  		if (fout == NULL) {
  			warn("Can't execute `%s'", local+1);
  			goto abort;
  		}
  		progress = 0;
  		preserve = 0;
  		closefunc = pclose;
  	} else {
  		fout = fopen(local, lmode);
  		if (fout == NULL) {
  			warn("Can't open `%s'", local);
  			goto abort;
  		}
  		closefunc = fclose;
  	}
  
  	if (fstat(fileno(fout), &st) != -1 && !S_ISREG(st.st_mode)) {
  		progress = 0;
  		preserve = 0;
  	}
  	assert(rcvbuf_size > 0);
  	if ((size_t)rcvbuf_size > bufsize) {
  		if (buf)
  			(void)free(buf);
  		bufsize = rcvbuf_size;
  		buf = ftp_malloc(bufsize);
  	}
  
  	progressmeter(-1);
  	hash_interval = (hash && (!progress || filesize < 0)) ? mark : 0;
  
  	switch (curtype) {
  
  	case TYPE_I:
  	case TYPE_L:
  		if (is_retr && restart_point &&
  		    lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
  			warn("Can't seek to restart `%s'", local);
  			goto cleanuprecv;
  		}
  		c = copy_bytes(fileno(din), fileno(fout), buf, bufsize,
  			       rate_get, hash_interval);
  		if (c == 1) {
  			if (errno != EPIPE)
  				warn("Reading from network");
  			bytes = -1;
  		} else if (c == 2) {
  			warn("Writing `%s'", local);
  		}
  		break;
  
  	case TYPE_A:
  		if (is_retr && restart_point) {
  			int ch;
  			off_t i;
  
  			if (fseeko(fout, (off_t)0, SEEK_SET) < 0)
  				goto done;
  			for (i = 0; i++ < restart_point;) {
  				if ((ch = getc(fout)) == EOF)
  					goto done;
  				if (ch == '\n')
  					i++;
  			}
  			if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) {
   done:
  				warn("Can't seek to restart `%s'", local);
  				goto cleanuprecv;
  			}
  		}
  		while ((c = getc(din)) != EOF) {
  			if (c == '\n')
  				bare_lfs++;
  			while (c == '\r') {
  				while (hash_interval && bytes >= hashbytes) {
  					(void)putc('#', ttyout);
  					(void)fflush(ttyout);
  					hashbytes += mark;
  				}
  				bytes++;
  				if ((c = getc(din)) != '\n' || tcrflag) {
  					if (ferror(fout))
  						goto break2;
  					(void)putc('\r', fout);
  					if (c == '\0') {
  						bytes++;
  						goto contin2;
  					}
  					if (c == EOF)
  						goto contin2;
  				}
  			}
  			(void)putc(c, fout);
  			bytes++;
  	contin2:	;
  		}
   break2:
  		if (hash_interval) {
  			if (bytes < hashbytes)
  				(void)putc('#', ttyout);
  			(void)putc('\n', ttyout);
  		}
  		if (ferror(din)) {
  			if (errno != EPIPE)
  				warn("Reading from network");
  			bytes = -1;
  		}
  		if (ferror(fout))
  			warn("Writing `%s'", local);
  		break;
  	}
  
  	progressmeter(1);
  	if (closefunc != NULL) {
  		(*closefunc)(fout);
  		fout = NULL;
  	}
  	(void)fclose(din);
  	din = NULL;
  	(void)getreply(0);
  	if (bare_lfs) {
  		fprintf(ttyout,
  		    "WARNING! %d bare linefeeds received in ASCII mode.\n",
  		    bare_lfs);
  		fputs("File may not have transferred correctly.\n", ttyout);
  	}
  	if (bytes >= 0 && is_retr) {
  		if (bytes > 0)
  			ptransfer(0);
  		if (preserve && (closefunc == fclose)) {
  			mtime = remotemodtime(remote, 0);
  			if (mtime != -1) {
  				(void)gettimeofday(&tval[0], NULL);
  				tval[1].tv_sec = mtime;
  				tval[1].tv_usec = 0;
  				if (utimes(local, tval) == -1) {
  					fprintf(ttyout,
  				"Can't change modification time on %s to %s",
  					    local,
  					    rfc2822time(localtime(&mtime)));
  				}
  			}
  		}
  	}
  	goto cleanuprecv;
  
   abort:
  			/*
  			 * abort using RFC 959 recommended IP,SYNC sequence
  			 */
  	if (! sigsetjmp(xferabort, 1)) {
  			/* this is the first call */
  		(void)xsignal(SIGINT, abort_squared);
  		if (!cpend) {
  			code = -1;
  			goto cleanuprecv;
  		}
  		abort_remote(din);
  	}
  	code = -1;
  	if (bytes > 0)
  		ptransfer(0);
  
   cleanuprecv:
  	if (oldintr)
  		(void)xsignal(SIGINT, oldintr);
  	if (oldintp)
  		(void)xsignal(SIGPIPE, oldintp);
  	if (data >= 0) {
  		(void)close(data);
  		data = -1;
  	}
  	if (closefunc != NULL && fout != NULL)
  		(*closefunc)(fout);
  	if (din)
  		(void)fclose(din);
  	progress = oprogress;
  	preserve = opreserve;
  	bytes = 0;
  }
  
  /*
   * Need to start a listen on the data channel before we send the command,
   * otherwise the server's connect may fail.
   */
  int
  initconn(void)
  {
  	char *p, *a;
  	int result, tmpno = 0;
  	int on = 1;
  	int error;
  	unsigned int addr[16], port[2];
  	unsigned int af, hal, pal;
  	socklen_t len;
  	const char *pasvcmd = NULL;
  	int overbose;
  
  #ifdef INET6
  #ifndef NO_DEBUG
  	if (myctladdr.su_family == AF_INET6 && ftp_debug &&
  	    (IN6_IS_ADDR_LINKLOCAL(&myctladdr.si_su.su_sin6.sin6_addr) ||
  	     IN6_IS_ADDR_SITELOCAL(&myctladdr.si_su.su_sin6.sin6_addr))) {
  		warnx("Use of scoped addresses can be troublesome");
  	}
  #endif
  #endif
  
   reinit:
  	if (passivemode) {
  		data_addr = myctladdr;
  		data = socket(data_addr.su_family, SOCK_STREAM, 0);
  		if (data < 0) {
  			warn("Can't create socket for data connection");
  			return (1);
  		}
  		if ((options & SO_DEBUG) &&
  		    setsockopt(data, SOL_SOCKET, SO_DEBUG,
  				(void *)&on, sizeof(on)) == -1) {
  			DWARN("setsockopt %s (ignored)", "SO_DEBUG");
  		}
  		result = COMPLETE + 1;
  		switch (data_addr.su_family) {
  		case AF_INET:
  			if (epsv4 && !epsv4bad) {
  				pasvcmd = "EPSV";
  				overbose = verbose;
  				if (ftp_debug == 0)
  					verbose = -1;
  				result = command("EPSV");
  				verbose = overbose;
  				if (verbose > 0 &&
  				    (result == COMPLETE || !connected))
  					fprintf(ttyout, "%s\n", reply_string);
  				if (!connected)
  					return (1);
  				/*
  				 * this code is to be friendly with broken
  				 * BSDI ftpd
  				 */
  				if (code / 10 == 22 && code != 229) {
  					fputs(
  "wrong server: return code must be 229\n",
  						ttyout);
  					result = COMPLETE + 1;
  				}
  				if (result != COMPLETE) {
  					epsv4bad = 1;
  					DPRINTF("disabling epsv4 for this "
  					    "connection\n");
  				}
  			}
  			if (result != COMPLETE) {
  				pasvcmd = "PASV";
  				result = command("PASV");
  				if (!connected)
  					return (1);
  			}
  			break;
  #ifdef INET6
  		case AF_INET6:
  			if (epsv6 && !epsv6bad) {
  				pasvcmd = "EPSV";
  				overbose = verbose;
  				if (ftp_debug == 0)
  					verbose = -1;
  				result = command("EPSV");
  				verbose = overbose;
  				if (verbose > 0 &&
  				    (result == COMPLETE || !connected))
  					fprintf(ttyout, "%s\n", reply_string);
  				if (!connected)
  					return (1);
  				/*
  				 * this code is to be friendly with
  				 * broken BSDI ftpd
  				 */
  				if (code / 10 == 22 && code != 229) {
  					fputs(
  						"wrong server: return code must be 229\n",
  						ttyout);
  					result = COMPLETE + 1;
  				}
  				if (result != COMPLETE) {
  					epsv6bad = 1;
  					DPRINTF("disabling epsv6 for this "
  					    "connection\n");
  				}
  			}
  			if (result != COMPLETE) {
  				pasvcmd = "LPSV";
  				result = command("LPSV");
  			}
  			if (!connected)
  				return (1);
  			break;
  #endif
  		default:
  			result = COMPLETE + 1;
  			break;
  		}
  		if (result != COMPLETE) {
  			if (activefallback) {
  				(void)close(data);
  				data = -1;
  				passivemode = 0;
  #if 0
  				activefallback = 0;
  #endif
  				goto reinit;
  			}
  			fputs("Passive mode refused.\n", ttyout);
  			goto bad;
  		}
  
  #define	pack2(var, off) \
  	(((var[(off) + 0] & 0xff) << 8) | ((var[(off) + 1] & 0xff) << 0))
  #define	pack4(var, off) \
  	(((var[(off) + 0] & 0xff) << 24) | ((var[(off) + 1] & 0xff) << 16) | \
  	 ((var[(off) + 2] & 0xff) << 8) | ((var[(off) + 3] & 0xff) << 0))
  #define	UC(b)	(((int)b)&0xff)
  
  		/*
  		 * What we've got at this point is a string of comma separated
  		 * one-byte unsigned integer values, separated by commas.
  		 */
  		if (strcmp(pasvcmd, "PASV") == 0) {
  			if (data_addr.su_family != AF_INET) {
  				fputs(
      "Passive mode AF mismatch. Shouldn't happen!\n", ttyout);
  				error = 1;
  				goto bad;
  			}
  			if (code / 10 == 22 && code != 227) {
  				fputs("wrong server: return code must be 227\n",
  					ttyout);
  				error = 1;
  				goto bad;
  			}
  			error = sscanf(pasv, "%u,%u,%u,%u,%u,%u",
  					&addr[0], &addr[1], &addr[2], &addr[3],
  					&port[0], &port[1]);
  			if (error != 6) {
  				fputs(
  "Passive mode address scan failure. Shouldn't happen!\n", ttyout);
  				error = 1;
  				goto bad;
  			}
  			error = 0;
  			memset(&data_addr, 0, sizeof(data_addr));
  			data_addr.su_family = AF_INET;
  			data_addr.su_len = sizeof(struct sockaddr_in);
  			data_addr.si_su.su_sin.sin_addr.s_addr =
  			    htonl(pack4(addr, 0));
  			data_addr.su_port = htons(pack2(port, 0));
  		} else if (strcmp(pasvcmd, "LPSV") == 0) {
  			if (code / 10 == 22 && code != 228) {
  				fputs("wrong server: return code must be 228\n",
  					ttyout);
  				error = 1;
  				goto bad;
  			}
  			switch (data_addr.su_family) {
  			case AF_INET:
  				error = sscanf(pasv,
  "%u,%u,%u,%u,%u,%u,%u,%u,%u",
  					&af, &hal,
  					&addr[0], &addr[1], &addr[2], &addr[3],
  					&pal, &port[0], &port[1]);
  				if (error != 9) {
  					fputs(
  "Passive mode address scan failure. Shouldn't happen!\n", ttyout);
  					error = 1;
  					goto bad;
  				}
  				if (af != 4 || hal != 4 || pal != 2) {
  					fputs(
  "Passive mode AF mismatch. Shouldn't happen!\n", ttyout);
  					error = 1;
  					goto bad;
  				}
  
  				error = 0;
  				memset(&data_addr, 0, sizeof(data_addr));
  				data_addr.su_family = AF_INET;
  				data_addr.su_len = sizeof(struct sockaddr_in);
  				data_addr.si_su.su_sin.sin_addr.s_addr =
  				    htonl(pack4(addr, 0));
  				data_addr.su_port = htons(pack2(port, 0));
  				break;
  #ifdef INET6
  			case AF_INET6:
  				error = sscanf(pasv,
  "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u",
  					&af, &hal,
  					&addr[0], &addr[1], &addr[2], &addr[3],
  					&addr[4], &addr[5], &addr[6], &addr[7],
  					&addr[8], &addr[9], &addr[10],
  					&addr[11], &addr[12], &addr[13],
  					&addr[14], &addr[15],
  					&pal, &port[0], &port[1]);
  				if (error != 21) {
  					fputs(
  "Passive mode address scan failure. Shouldn't happen!\n", ttyout);
  					error = 1;
  					goto bad;
  				}
  				if (af != 6 || hal != 16 || pal != 2) {
  					fputs(
  "Passive mode AF mismatch. Shouldn't happen!\n", ttyout);
  					error = 1;
  					goto bad;
  				}
  
  				error = 0;
  				memset(&data_addr, 0, sizeof(data_addr));
  				data_addr.su_family = AF_INET6;
  				data_addr.su_len = sizeof(struct sockaddr_in6);
  			    {
  				size_t i;
  				for (i = 0; i < sizeof(struct in6_addr); i++) {
  					data_addr.si_su.su_sin6.sin6_addr.s6_addr[i] =
  					    UC(addr[i]);
  				}
  			    }
  				data_addr.su_port = htons(pack2(port, 0));
  				break;
  #endif
  			default:
  				error = 1;
  			}
  		} else if (strcmp(pasvcmd, "EPSV") == 0) {
  			char delim[4];
  
  			port[0] = 0;
  			if (code / 10 == 22 && code != 229) {
  				fputs("wrong server: return code must be 229\n",
  					ttyout);
  				error = 1;
  				goto bad;
  			}
  			if (sscanf(pasv, "%c%c%c%d%c", &delim[0],
  					&delim[1], &delim[2], &port[1],
  					&delim[3]) != 5) {
  				fputs("parse error!\n", ttyout);
  				error = 1;
  				goto bad;
  			}
  			if (delim[0] != delim[1] || delim[0] != delim[2]
  			 || delim[0] != delim[3]) {
  				fputs("parse error!\n", ttyout);
  				error = 1;
  				goto bad;
  			}
  			data_addr = hisctladdr;
  			data_addr.su_port = htons(port[1]);
  		} else
  			goto bad;
  
  		if (ftp_connect(data, (struct sockaddr *)&data_addr.si_su,
  		    data_addr.su_len, 1) < 0) {
  			if (activefallback) {
  				(void)close(data);
  				data = -1;
  				passivemode = 0;
  #if 0
  				activefallback = 0;
  #endif
  				goto reinit;
  			}
  			goto bad;
  		}
  #ifdef IPTOS_THROUGHPUT
  		if (data_addr.su_family == AF_INET) {
  			on = IPTOS_THROUGHPUT;
  			if (setsockopt(data, IPPROTO_IP, IP_TOS,
  					(void *)&on, sizeof(on)) == -1) {
  				DWARN("setsockopt %s (ignored)",
  				    "IPTOS_THROUGHPUT");
  			}
  		}
  #endif
  		return (0);
  	}
  
   noport:
  	data_addr = myctladdr;
  	if (sendport)
  		data_addr.su_port = 0;	/* let system pick one */
  	if (data != -1)
  		(void)close(data);
  	data = socket(data_addr.su_family, SOCK_STREAM, 0);
  	if (data < 0) {
  		warn("Can't create socket for data connection");
  		if (tmpno)
  			sendport = 1;
  		return (1);
  	}
  	if (!sendport)
  		if (setsockopt(data, SOL_SOCKET, SO_REUSEADDR,
  				(void *)&on, sizeof(on)) == -1) {
  			warn("Can't set SO_REUSEADDR on data connection");
  			goto bad;
  		}
  	if (bind(data, (struct sockaddr *)&data_addr.si_su,
  	    data_addr.su_len) < 0) {
  		warn("Can't bind for data connection");
  		goto bad;
  	}
  	if ((options & SO_DEBUG) &&
  	    setsockopt(data, SOL_SOCKET, SO_DEBUG,
  			(void *)&on, sizeof(on)) == -1) {
  		DWARN("setsockopt %s (ignored)", "SO_DEBUG");
  	}
  	len = sizeof(data_addr.si_su);
  	memset((char *)&data_addr, 0, sizeof (data_addr));
  	if (getsockname(data, (struct sockaddr *)&data_addr.si_su, &len) == -1) {
  		warn("Can't determine my address of data connection");
  		goto bad;
  	}
  	data_addr.su_len = len;
  	if (ftp_listen(data, 1) < 0)
  		warn("Can't listen to data connection");
  
  	if (sendport) {
  		char hname[NI_MAXHOST], sname[NI_MAXSERV];
  		struct sockinet tmp;
  
  		switch (data_addr.su_family) {
  		case AF_INET:
  			if (!epsv4 || epsv4bad) {
  				result = COMPLETE + 1;
  				break;
  			}
  			/* FALLTHROUGH */
  #ifdef INET6
  		case AF_INET6:
  			if (!epsv6 || epsv6bad) {
  				result = COMPLETE + 1;
  				break;
  			}
  #endif
  			af = (data_addr.su_family == AF_INET) ? 1 : 2;
  			tmp = data_addr;
  #ifdef INET6
  			if (tmp.su_family == AF_INET6)
  				tmp.si_su.su_sin6.sin6_scope_id = 0;
  #endif
  			if (getnameinfo((struct sockaddr *)&tmp.si_su,
  			    tmp.su_len, hname, sizeof(hname), sname,
  			    sizeof(sname), NI_NUMERICHOST | NI_NUMERICSERV)) {
  				result = ERROR;
  			} else {
  				overbose = verbose;
  				if (ftp_debug == 0)
  					verbose = -1;
  				result = command("EPRT |%u|%s|%s|", af, hname,
  				    sname);
  				verbose = overbose;
  				if (verbose > 0 &&
  				    (result == COMPLETE || !connected))
  					fprintf(ttyout, "%s\n", reply_string);
  				if (!connected)
  					return (1);
  				if (result != COMPLETE) {
  					epsv4bad = 1;
  					DPRINTF("disabling epsv4 for this "
  					    "connection\n");
  				}
  			}
  			break;
  		default:
  			result = COMPLETE + 1;
  			break;
  		}
  		if (result == COMPLETE)
  			goto skip_port;
  
  		switch (data_addr.su_family) {
  		case AF_INET:
  			a = (char *)&data_addr.si_su.su_sin.sin_addr;
  			p = (char *)&data_addr.su_port;
  			result = command("PORT %d,%d,%d,%d,%d,%d",
  				 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
  				 UC(p[0]), UC(p[1]));
  			break;
  #ifdef INET6
  		case AF_INET6: {
  			uint8_t ua[sizeof(data_addr.si_su.su_sin6.sin6_addr)];
  			uint8_t up[sizeof(data_addr.su_port)];
  
  			memcpy(ua, &data_addr.si_su.su_sin6.sin6_addr,
  			    sizeof(ua));
  			memcpy(up, &data_addr.su_port, sizeof(up));
  			
  			result = command(
  	"LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
  				 6, 16,
  				  ua[0],  ua[1],  ua[2],  ua[3],
  				  ua[4],  ua[5],  ua[6],  ua[7],
  				  ua[8],  ua[9], ua[10], ua[11],
  				 ua[12], ua[13], ua[14], ua[15],
  				 2,
  				 up[0], up[1]);
  			break;
  		}
  #endif
  		default:
  			result = COMPLETE + 1; /* xxx */
  		}
  		if (!connected)
  			return (1);
  	skip_port:
  
  		if (result == ERROR && sendport == -1) {
  			sendport = 0;
  			tmpno = 1;
  			goto noport;
  		}
  		return (result != COMPLETE);
  	}
  	if (tmpno)
  		sendport = 1;
  #ifdef IPTOS_THROUGHPUT
  	if (data_addr.su_family == AF_INET) {
  		on = IPTOS_THROUGHPUT;
  		if (setsockopt(data, IPPROTO_IP, IP_TOS,
  				(void *)&on, sizeof(on)) == -1) {
  			DWARN("setsockopt %s (ignored)", "IPTOS_THROUGHPUT");
  		}
  	}
  #endif
  	return (0);
   bad:
  	(void)close(data);
  	data = -1;
  	if (tmpno)
  		sendport = 1;
  	return (1);
  }
  
  FILE *
  dataconn(const char *lmode)
  {
  	struct sockinet	from;
  	int		s, flags, rv, timeout;
  	struct timeval	endtime, now, td;
  	struct pollfd	pfd[1];
  	socklen_t	fromlen;
  
  	if (passivemode)	/* passive data connection */
  		return (fdopen(data, lmode));
  
  				/* active mode data connection */
  
  	if ((flags = fcntl(data, F_GETFL, 0)) == -1)
  		goto dataconn_failed;		/* get current socket flags  */
  	if (fcntl(data, F_SETFL, flags | O_NONBLOCK) == -1)
  		goto dataconn_failed;		/* set non-blocking connect */
  
  		/* NOTE: we now must restore socket flags on successful exit */
  
  				/* limit time waiting on listening socket */
  	pfd[0].fd = data;
  	pfd[0].events = POLLIN;
  	(void)gettimeofday(&endtime, NULL);	/* determine end time */
  	endtime.tv_sec += (quit_time > 0) ? quit_time: 60;
  						/* without -q, default to 60s */
  	do {
  		(void)gettimeofday(&now, NULL);
  		timersub(&endtime, &now, &td);
  		timeout = td.tv_sec * 1000 + td.tv_usec/1000;
  		if (timeout < 0)
  			timeout = 0;
  		rv = ftp_poll(pfd, 1, timeout);
  	} while (rv == -1 && errno == EINTR);	/* loop until poll ! EINTR */
  	if (rv == -1) {
  		warn("Can't poll waiting before accept");
  		goto dataconn_failed;
  	}
  	if (rv == 0) {
  		warnx("Poll timeout waiting before accept");
  		goto dataconn_failed;
  	}
  
  				/* (non-blocking) accept the connection */
  	fromlen = myctladdr.su_len;
  	do {
  		s = accept(data, (struct sockaddr *) &from.si_su, &fromlen);
  	} while (s == -1 && errno == EINTR);	/* loop until accept ! EINTR */
  	if (s == -1) {
  		warn("Can't accept data connection");
  		goto dataconn_failed;
  	}
  
  	(void)close(data);
  	data = s;
  	if (fcntl(data, F_SETFL, flags) == -1)	/* restore socket flags */
  		goto dataconn_failed;
  
  #ifdef IPTOS_THROUGHPUT
  	if (from.su_family == AF_INET) {
  		int tos = IPTOS_THROUGHPUT;
  		if (setsockopt(s, IPPROTO_IP, IP_TOS,
  				(void *)&tos, sizeof(tos)) == -1) {
  			DWARN("setsockopt %s (ignored)", "IPTOS_THROUGHPUT");
  		}
  	}
  #endif
  	return (fdopen(data, lmode));
  
   dataconn_failed:
  	(void)close(data);
  	data = -1;
  	return (NULL);
  }
  
  void
  psabort(int notused)
  {
  	int oerrno = errno;
  
  	sigint_raised = 1;
  	alarmtimer(0);
  	abrtflag++;
  	errno = oerrno;
  }
  
  void
  pswitch(int flag)
  {
  	sigfunc oldintr;
  	static struct comvars {
  		int connect;
  		char name[MAXHOSTNAMELEN];
  		struct sockinet mctl;
  		struct sockinet hctl;
  		FILE *in;
  		FILE *out;
  		int tpe;
  		int curtpe;
  		int cpnd;
  		int sunqe;
  		int runqe;
  		int mcse;
  		int ntflg;
  		char nti[17];
  		char nto[17];
  		int mapflg;
  		char mi[MAXPATHLEN];
  		char mo[MAXPATHLEN];
  	} proxstruct, tmpstruct;
  	struct comvars *ip, *op;
  
  	abrtflag = 0;
  	oldintr = xsignal(SIGINT, psabort);
  	if (flag) {
  		if (proxy)
  			return;
  		ip = &tmpstruct;
  		op = &proxstruct;
  		proxy++;
  	} else {
  		if (!proxy)
  			return;
  		ip = &proxstruct;
  		op = &tmpstruct;
  		proxy = 0;
  	}
  	ip->connect = connected;
  	connected = op->connect;
  	if (hostname)
  		(void)strlcpy(ip->name, hostname, sizeof(ip->name));
  	else
  		ip->name[0] = '\0';
  	hostname = op->name;
  	ip->hctl = hisctladdr;
  	hisctladdr = op->hctl;
  	ip->mctl = myctladdr;
  	myctladdr = op->mctl;
  	ip->in = cin;
  	cin = op->in;
  	ip->out = cout;
  	cout = op->out;
  	ip->tpe = type;
  	type = op->tpe;
  	ip->curtpe = curtype;
  	curtype = op->curtpe;
  	ip->cpnd = cpend;
  	cpend = op->cpnd;
  	ip->sunqe = sunique;
  	sunique = op->sunqe;
  	ip->runqe = runique;
  	runique = op->runqe;
  	ip->mcse = mcase;
  	mcase = op->mcse;
  	ip->ntflg = ntflag;
  	ntflag = op->ntflg;
  	(void)strlcpy(ip->nti, ntin, sizeof(ip->nti));
  	(void)strlcpy(ntin, op->nti, sizeof(ntin));
  	(void)strlcpy(ip->nto, ntout, sizeof(ip->nto));
  	(void)strlcpy(ntout, op->nto, sizeof(ntout));
  	ip->mapflg = mapflag;
  	mapflag = op->mapflg;
  	(void)strlcpy(ip->mi, mapin, sizeof(ip->mi));
  	(void)strlcpy(mapin, op->mi, sizeof(mapin));
  	(void)strlcpy(ip->mo, mapout, sizeof(ip->mo));
  	(void)strlcpy(mapout, op->mo, sizeof(mapout));
  	(void)xsignal(SIGINT, oldintr);
  	if (abrtflag) {
  		abrtflag = 0;
  		(*oldintr)(SIGINT);
  	}
  }
  
  __dead static void
  abortpt(int notused)
  {
  
  	sigint_raised = 1;
  	alarmtimer(0);
  	if (fromatty)
  		write(fileno(ttyout), "\n", 1);
  	ptabflg++;
  	mflag = 0;
  	abrtflag = 0;
  	siglongjmp(ptabort, 1);
  }
  
  void
  proxtrans(const char *cmd, const char *local, const char *remote)
  {
  	sigfunc volatile oldintr;
  	int prox_type, nfnd;
  	int volatile secndflag;
  	const char *volatile cmd2;
  
  	oldintr = NULL;
  	secndflag = 0;
  	if (strcmp(cmd, "RETR"))
  		cmd2 = "RETR";
  	else
  		cmd2 = runique ? "STOU" : "STOR";
  	if ((prox_type = type) == 0) {
  		if (unix_server && unix_proxy)
  			prox_type = TYPE_I;
  		else
  			prox_type = TYPE_A;
  	}
  	if (curtype != prox_type)
  		changetype(prox_type, 1);
  	if (command("PASV") != COMPLETE) {
  		fputs("proxy server does not support third party transfers.\n",
  		    ttyout);
  		return;
  	}
  	pswitch(0);
  	if (!connected) {
  		fputs("No primary connection.\n", ttyout);
  		pswitch(1);
  		code = -1;
  		return;
  	}
  	if (curtype != prox_type)
  		changetype(prox_type, 1);
  	if (command("PORT %s", pasv) != COMPLETE) {
  		pswitch(1);
  		return;
  	}
  	if (sigsetjmp(ptabort, 1))
  		goto abort;
  	oldintr = xsignal(SIGINT, abortpt);
  	if ((restart_point &&
  	    (command("REST " LLF, (LLT) restart_point) != CONTINUE))
  	    || (command("%s %s", cmd, remote) != PRELIM)) {
  		(void)xsignal(SIGINT, oldintr);
  		pswitch(1);
  		return;
  	}
  	sleep(2);
  	pswitch(1);
  	secndflag++;
  	if ((restart_point &&
  	    (command("REST " LLF, (LLT) restart_point) != CONTINUE))
  	    || (command("%s %s", cmd2, local) != PRELIM))
  		goto abort;
  	ptflag++;
  	(void)getreply(0);
  	pswitch(0);
  	(void)getreply(0);
  	(void)xsignal(SIGINT, oldintr);
  	pswitch(1);
  	ptflag = 0;
  	fprintf(ttyout, "local: %s remote: %s\n", local, remote);
  	return;
   abort:
  	if (sigsetjmp(xferabort, 1)) {
  		(void)xsignal(SIGINT, oldintr);
  		return;
  	}
  	(void)xsignal(SIGINT, abort_squared);
  	ptflag = 0;
  	if (strcmp(cmd, "RETR") && !proxy)
  		pswitch(1);
  	else if (!strcmp(cmd, "RETR") && proxy)
  		pswitch(0);
  	if (!cpend && !secndflag) {  /* only here if cmd = "STOR" (proxy=1) */
  		if (command("%s %s", cmd2, local) != PRELIM) {
  			pswitch(0);
  			if (cpend)
  				abort_remote(NULL);
  		}
  		pswitch(1);
  		if (ptabflg)
  			code = -1;
  		(void)xsignal(SIGINT, oldintr);
  		return;
  	}
  	if (cpend)
  		abort_remote(NULL);
  	pswitch(!proxy);
  	if (!cpend && !secndflag) {  /* only if cmd = "RETR" (proxy=1) */
  		if (command("%s %s", cmd2, local) != PRELIM) {
  			pswitch(0);
  			if (cpend)
  				abort_remote(NULL);
  			pswitch(1);
  			if (ptabflg)
  				code = -1;
  			(void)xsignal(SIGINT, oldintr);
  			return;
  		}
  	}
  	if (cpend)
  		abort_remote(NULL);
  	pswitch(!proxy);
  	if (cpend) {
  		if ((nfnd = empty(cin, NULL, 10)) <= 0) {
  			if (nfnd < 0)
  				warn("Error aborting proxy command");
  			if (ptabflg)
  				code = -1;
  			lostpeer(0);
  		}
  		(void)getreply(0);
  		(void)getreply(0);
  	}
  	if (proxy)
  		pswitch(0);
  	pswitch(1);
  	if (ptabflg)
  		code = -1;
  	(void)xsignal(SIGINT, oldintr);
  }
  
  void
  reset(int argc, char *argv[])
  {
  	int nfnd = 1;
  
  	if (argc == 0 && argv != NULL) {
  		UPRINTF("usage: %s\n", argv[0]);
  		code = -1;
  		return;
  	}
  	while (nfnd > 0) {
  		if ((nfnd = empty(cin, NULL, 0)) < 0) {
  			warn("Error resetting connection");
  			code = -1;
  			lostpeer(0);
  		} else if (nfnd)
  			(void)getreply(0);
  	}
  }
  
  char *
  gunique(const char *local)
  {
  	static char new[MAXPATHLEN];
  	char *cp = strrchr(local, '/');
  	int d, count=0, len;
  	char ext = '1';
  
  	if (cp)
  		*cp = '\0';
  	d = access(cp == local ? "/" : cp ? local : ".", W_OK);
  	if (cp)
  		*cp = '/';
  	if (d < 0) {
  		warn("Can't access `%s'", local);
  		return (NULL);
  	}
  	len = strlcpy(new, local, sizeof(new));
  	cp = &new[len];
  	*cp++ = '.';
  	while (!d) {
  		if (++count == 100) {
  			fputs("runique: can't find unique file name.\n",
  			    ttyout);
  			return (NULL);
  		}
  		*cp++ = ext;
  		*cp = '\0';
  		if (ext == '9')
  			ext = '0';
  		else
  			ext++;
  		if ((d = access(new, F_OK)) < 0)
  			break;
  		if (ext != '0')
  			cp--;
  		else if (*(cp - 2) == '.')
  			*(cp - 1) = '1';
  		else {
  			*(cp - 2) = *(cp - 2) + 1;
  			cp--;
  		}
  	}
  	return (new);
  }
  
  /*
   * abort_squared --
   *	aborts abort_remote(). lostpeer() is called because if the user is
   *	too impatient to wait or there's another problem then ftp really
   *	needs to get back to a known state.
   */
  static void
  abort_squared(int dummy)
  {
  	char msgbuf[100];
  	size_t len;
  
  	sigint_raised = 1;
  	alarmtimer(0);
  	len = strlcpy(msgbuf, "\nremote abort aborted; closing connection.\n",
  	    sizeof(msgbuf));
  	write(fileno(ttyout), msgbuf, len);
  	lostpeer(0);
  	siglongjmp(xferabort, 1);
  }
  
  void
  abort_remote(FILE *din)
  {
  	char buf[BUFSIZ];
  	int nfnd;
  
  	if (cout == NULL) {
  		warnx("Lost control connection for abort");
  		if (ptabflg)
  			code = -1;
  		lostpeer(0);
  		return;
  	}
  	/*
  	 * send IAC in urgent mode instead of DM because 4.3BSD places oob mark
  	 * after urgent byte rather than before as is protocol now
  	 */
  	buf[0] = IAC;
  	buf[1] = IP;
  	buf[2] = IAC;
  	if (send(fileno(cout), buf, 3, MSG_OOB) != 3)
  		warn("Can't send abort message");
  	fprintf(cout, "%cABOR\r\n", DM);
  	(void)fflush(cout);
  	if ((nfnd = empty(cin, din, 10)) <= 0) {
  		if (nfnd < 0)
  			warn("Can't send abort message");
  		if (ptabflg)
  			code = -1;
  		lostpeer(0);
  	}
  	if (din && (nfnd & 2)) {
  		while (read(fileno(din), buf, BUFSIZ) > 0)
  			continue;
  	}
  	if (getreply(0) == ERROR && code == 552) {
  		/* 552 needed for nic style abort */
  		(void)getreply(0);
  	}
  	(void)getreply(0);
  }
  
  /*
   * Ensure that ai->ai_addr is NOT an IPv4 mapped address.
   * IPv4 mapped address complicates too many things in FTP
   * protocol handling, as FTP protocol is defined differently
   * between IPv4 and IPv6.
   *
   * This may not be the best way to handle this situation,
   * since the semantics of IPv4 mapped address is defined in
   * the kernel.  There are configurations where we should use
   * IPv4 mapped address as native IPv6 address, not as
   * "an IPv6 address that embeds IPv4 address" (namely, SIIT).
   *
   * More complete solution would be to have an additional
   * getsockopt to grab "real" peername/sockname.  "real"
   * peername/sockname will be AF_INET if IPv4 mapped address
   * is used to embed IPv4 address, and will be AF_INET6 if
   * we use it as native.  What a mess!
   */
  void
  ai_unmapped(struct addrinfo *ai)
  {
  #ifdef INET6
  	struct sockaddr_in6 *sin6;
  	struct sockaddr_in sin;
  	socklen_t len;
  
  	if (ai->ai_family != AF_INET6)
  		return;
  	if (ai->ai_addrlen != sizeof(struct sockaddr_in6) ||
  	    sizeof(sin) > ai->ai_addrlen)
  		return;
  	sin6 = (struct sockaddr_in6 *)ai->ai_addr;
  	if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
  		return;
  
  	memset(&sin, 0, sizeof(sin));
  	sin.sin_family = AF_INET;
  	len = sizeof(struct sockaddr_in);
  	memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
  	    sizeof(sin.sin_addr));
  	sin.sin_port = sin6->sin6_port;
  
  	ai->ai_family = AF_INET;
  #if defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN)
  	sin.sin_len = len;
  #endif
  	memcpy(ai->ai_addr, &sin, len);
  	ai->ai_addrlen = len;
  #endif
  }
  
  #ifdef NO_USAGE
  void
  xusage(void)
  {
  	fputs("Usage error\n", ttyout);
  }
  #endif
  