text: /*
   * Copyright (c) 1985, 1988, 1990, 1992, 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. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * @(#)ftpd.c	8.4 (Berkeley) 4/16/94
   * $FreeBSD: src/libexec/ftpd/ftpd.c,v 1.213 2008/12/23 01:23:09 cperciva Exp $
   */
  
  /*
   * FTP server.
   */
  #include <sys/param.h>
  #include <sys/ioctl.h>
  #include <sys/mman.h>
  #include <sys/socket.h>
  #include <sys/stat.h>
  #include <sys/time.h>
  #include <sys/wait.h>
  
  #include <netinet/in.h>
  #include <netinet/in_systm.h>
  #include <netinet/ip.h>
  #include <netinet/tcp.h>
  
  #define	FTP_NAMES
  #include <arpa/ftp.h>
  #include <arpa/inet.h>
  #include <arpa/telnet.h>
  
  #include <ctype.h>
  #include <dirent.h>
  #include <err.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <glob.h>
  #include <limits.h>
  #include <netdb.h>
  #include <pwd.h>
  #include <grp.h>
  #include <opie.h>
  #include <signal.h>
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <syslog.h>
  #include <time.h>
  #include <unistd.h>
  #include <libutil.h>
  #ifdef	LOGIN_CAP
  #include <login_cap.h>
  #endif
  
  #ifdef USE_PAM
  #include <security/pam_appl.h>
  #endif
  
  #include "pathnames.h"
  #include "extern.h"
  #include "pidfile.h"
  
  #include <stdarg.h>
  
  static char version[] = "Version 6.00LS";
  #undef main
  
  extern	off_t restart_point;
  extern	char cbuf[];
  
  union sockunion ctrl_addr;
  union sockunion data_source;
  union sockunion data_dest;
  union sockunion his_addr;
  union sockunion pasv_addr;
  
  int	daemon_mode;
  int	data;
  int	dataport;
  int	hostinfo = 1;	/* print host-specific info in messages */
  int	logged_in;
  struct	passwd *pw;
  char	*homedir;
  int	ftpdebug;
  int	timeout = 900;    /* timeout after 15 minutes of inactivity */
  int	maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
  int	logging;
  int	restricted_data_ports = 1;
  int	paranoid = 1;	  /* be extra careful about security */
  int	anon_only = 0;    /* Only anonymous ftp allowed */
  int	assumeutf8 = 0;   /* Assume that server file names are in UTF-8 */
  int	guest;
  int	dochroot;
  char	*chrootdir;
  int	dowtmp = 1;
  int	stats;
  int	statfd = -1;
  int	type;
  int	form;
  int	stru;			/* avoid C keyword */
  int	mode;
  int	usedefault = 1;		/* for data transfers */
  int	pdata = -1;		/* for passive mode */
  int	readonly = 0;		/* Server is in readonly mode.	*/
  int	noepsv = 0;		/* EPSV command is disabled.	*/
  int	noretr = 0;		/* RETR command is disabled.	*/
  int	noguestretr = 0;	/* RETR command is disabled for anon users. */
  int	noguestmkd = 0;		/* MKD command is disabled for anon users. */
  int	noguestmod = 1;		/* anon users may not modify existing files. */
  
  off_t	file_size;
  off_t	byte_count;
  #if !defined(CMASK) || CMASK == 0
  #undef CMASK
  #define CMASK 027
  #endif
  int	defumask = CMASK;		/* default umask value */
  char	tmpline[7];
  char	*hostname;
  int	epsvall = 0;
  
  #ifdef VIRTUAL_HOSTING
  char	*ftpuser;
  
  static struct ftphost {
  	struct ftphost	*next;
  	struct addrinfo *hostinfo;
  	char		*hostname;
  	char		*anonuser;
  	char		*statfile;
  	char		*welcome;
  	char		*loginmsg;
  } *thishost, *firsthost;
  
  #endif
  char	remotehost[NI_MAXHOST];
  char	*ident = NULL;
  
  static char	ttyline[20];
  char		*tty = ttyline;		/* for klogin */
  
  #ifdef USE_PAM
  static int	auth_pam(struct passwd**, const char*);
  pam_handle_t	*pamh = NULL;
  #endif
  
  static struct opie	opiedata;
  static char		opieprompt[OPIE_CHALLENGE_MAX+1];
  static int		pwok;
  
  char	*pid_file = NULL; /* means default location to pidfile(3) */
  
  /*
   * Limit number of pathnames that glob can return.
   * A limit of 0 indicates the number of pathnames is unlimited.
   */
  #define MAXGLOBARGS	16384
  #
  
  /*
   * Timeout intervals for retrying connections
   * to hosts that don't accept PORT cmds.  This
   * is a kludge, but given the problems with TCP...
   */
  #define	SWAITMAX	90	/* wait at most 90 seconds */
  #define	SWAITINT	5	/* interval between retries */
  
  int	swaitmax = SWAITMAX;
  int	swaitint = SWAITINT;
  
  #ifdef SETPROCTITLE
  char	proctitle[LINE_MAX];	/* initial part of title */
  #endif /* SETPROCTITLE */
  
  #define LOGCMD(cmd, file)		logcmd((cmd), (file), NULL, -1)
  #define LOGCMD2(cmd, file1, file2)	logcmd((cmd), (file1), (file2), -1)
  #define LOGBYTES(cmd, file, cnt)	logcmd((cmd), (file), NULL, (cnt))
  
  static	volatile sig_atomic_t recvurg;
  static	int transflag;		/* NB: for debugging only */
  
  #define STARTXFER	flagxfer(1)
  #define ENDXFER		flagxfer(0)
  
  #define START_UNSAFE	maskurg(1)
  #define END_UNSAFE	maskurg(0)
  
  /* It's OK to put an `else' clause after this macro. */
  #define CHECKOOB(action)						\
  	if (recvurg) {							\
  		recvurg = 0;						\
  		if (myoob()) {						\
  			ENDXFER;					\
  			action;						\
  		}							\
  	}
  
  #ifdef VIRTUAL_HOSTING
  static void	 inithosts(int);
  static void	 selecthost(union sockunion *);
  #endif
  static void	 ack(char *);
  static void	 sigurg(int);
  static void	 maskurg(int);
  static void	 flagxfer(int);
  static int	 myoob(void);
  static int	 checkuser(char *, char *, int, char **);
  static FILE	*dataconn(char *, off_t, char *);
  static void	 dolog(struct sockaddr *);
  static void	 end_login(void);
  static FILE	*getdatasock(char *);
  static int	 guniquefd(char *, char **);
  static void	 lostconn(int);
  static void	 sigquit(int);
  static int	 receive_data(FILE *, FILE *);
  static int	 send_data(FILE *, FILE *, size_t, off_t, int);
  static struct passwd *
  		 sgetpwnam(char *);
  static char	*sgetsave(char *);
  static void	 reapchild(int);
  static void	 appendf(char **, char *, ...) __printflike(2, 3);
  static void	 logcmd(char *, char *, char *, off_t);
  static void      logxfer(char *, off_t, time_t);
  static char	*doublequote(char *);
  static int	*socksetup(int, char *, const char *);
  
  int
  main(int argc, char *argv[])
  {
  	socklen_t addrlen;
  	int ch, on = 1, tos;
  	char *cp, line[LINE_MAX];
  	FILE *fd;
  	char	*bindname = NULL;
  	const char *bindport = "ftp";
  	int	family = AF_UNSPEC;
  	struct sigaction sa;
  
  	tzset();		/* in case no timezone database in ~ftp */
  	sigemptyset(&sa.sa_mask);
  	sa.sa_flags = SA_RESTART;
  
  	/*
  	 * Prevent diagnostic messages from appearing on stderr.
  	 * We run as a daemon or from inetd; in both cases, there's
  	 * more reason in logging to syslog.
  	 */
  	freopen(_PATH_DEVNULL, "w", stderr);
  	opterr = 0;
  
  	/*
  	 * LOG_NDELAY sets up the logging connection immediately,
  	 * necessary for anonymous ftp's that chroot and can't do it later.
  	 */
  	openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
  
  	while ((ch = getopt(argc, argv,
  	                    "468a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) {
  		switch (ch) {
  		case '4':
  			family = (family == AF_INET6) ? AF_UNSPEC : AF_INET;
  			break;
  
  		case '6':
  			family = (family == AF_INET) ? AF_UNSPEC : AF_INET6;
  			break;
  
  		case '8':
  			assumeutf8 = 1;
  			break;
  
  		case 'a':
  			bindname = optarg;
  			break;
  
  		case 'A':
  			anon_only = 1;
  			break;
  
  		case 'd':
  			ftpdebug++;
  			break;
  
  		case 'D':
  			daemon_mode++;
  			break;
  
  		case 'E':
  			noepsv = 1;
  			break;
  
  		case 'h':
  			hostinfo = 0;
  			break;
  
  		case 'H':
  			hostname = optarg;
  			break;
  
  		case 'l':
  			logging++;	/* > 1 == extra logging */
  			break;
  
  		case 'm':
  			noguestmod = 0;
  			break;
  
  		case 'M':
  			noguestmkd = 1;
  			break;
  
  		case 'o':
  			noretr = 1;
  			break;
  
  		case 'O':
  			noguestretr = 1;
  			break;
  
  		case 'p':
  			pid_file = optarg;
  			break;
  
  		case 'P':
  			bindport = optarg;
  			break;
  
  		case 'r':
  			readonly = 1;
  			break;
  
  		case 'R':
  			paranoid = 0;
  			break;
  
  		case 'S':
  			stats++;
  			break;
  
  		case 't':
  			timeout = atoi(optarg);
  			if (maxtimeout < timeout)
  				maxtimeout = timeout;
  			break;
  
  		case 'T':
  			maxtimeout = atoi(optarg);
  			if (timeout > maxtimeout)
  				timeout = maxtimeout;
  			break;
  
  		case 'u':
  		    {
  			long val = 0;
  
  			val = strtol(optarg, &optarg, 8);
  			if (*optarg != '\0' || val < 0)
  				syslog(LOG_WARNING, "bad value for -u");
  			else
  				defumask = val;
  			break;
  		    }
  		case 'U':
  			restricted_data_ports = 0;
  			break;
  
  		case 'v':
  			ftpdebug++;
  			break;
  
  		case 'W':
  			dowtmp = 0;
  			break;
  
  		default:
  			syslog(LOG_WARNING, "unknown flag -%c ignored", optopt);
  			break;
  		}
  	}
  
  	if (daemon_mode) {
  		int *ctl_sock, fd, maxfd = -1, nfds, i;
  		fd_set defreadfds, readfds;
  		pid_t pid;
  		struct pidfh *pfh;
  
  		if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) {
  			if (errno == EEXIST) {
  				syslog(LOG_ERR, "%s already running, pid %d",
  				       getprogname(), (int)pid);
  				exit(1);
  			}
  			syslog(LOG_WARNING, "pidfile_open: %m");
  		}
  
  		/*
  		 * Detach from parent.
  		 */
  		if (daemon(1, 1) < 0) {
  			syslog(LOG_ERR, "failed to become a daemon");
  			exit(1);
  		}
  
  		if (pfh != NULL && pidfile_write(pfh) == -1)
  			syslog(LOG_WARNING, "pidfile_write: %m");
  
  		sa.sa_handler = reapchild;
  		sigaction(SIGCHLD, &sa, NULL);
  
  #ifdef VIRTUAL_HOSTING
  		inithosts(family);
  #endif
  
  		/*
  		 * Open a socket, bind it to the FTP port, and start
  		 * listening.
  		 */
  		ctl_sock = socksetup(family, bindname, bindport);
  		if (ctl_sock == NULL)
  			exit(1);
  
  		FD_ZERO(&defreadfds);
  		for (i = 1; i <= *ctl_sock; i++) {
  			FD_SET(ctl_sock[i], &defreadfds);
  			if (listen(ctl_sock[i], 32) < 0) {
  				syslog(LOG_ERR, "control listen: %m");
  				exit(1);
  			}
  			if (maxfd < ctl_sock[i])
  				maxfd = ctl_sock[i];
  		}
  
  		/*
  		 * Loop forever accepting connection requests and forking off
  		 * children to handle them.
  		 */
  		while (1) {
  			FD_COPY(&defreadfds, &readfds);
  			nfds = select(maxfd + 1, &readfds, NULL, NULL, 0);
  			if (nfds <= 0) {
  				if (nfds < 0 && errno != EINTR)
  					syslog(LOG_WARNING, "select: %m");
  				continue;
  			}
  
  			pid = -1;
                          for (i = 1; i <= *ctl_sock; i++)
  				if (FD_ISSET(ctl_sock[i], &readfds)) {
  					addrlen = sizeof(his_addr);
  					fd = accept(ctl_sock[i],
  					    (struct sockaddr *)&his_addr,
  					    &addrlen);
  					if (fd == -1) {
  						syslog(LOG_WARNING,
  						       "accept: %m");
  						continue;
  					}
  					switch (pid = fork()) {
  					case 0:
  						/* child */
  						dup2(fd, 0);
  						dup2(fd, 1);
  						close(fd);
  						for (i = 1; i <= *ctl_sock; i++)
  							close(ctl_sock[i]);
  						if (pfh != NULL)
  							pidfile_close(pfh);
  						goto gotchild;
  					case -1:
  						syslog(LOG_WARNING, "fork: %m");
  						/* FALLTHROUGH */
  					default:
  						close(fd);
  					}
  				}
  		}
  	} else {
  		addrlen = sizeof(his_addr);
  		if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
  			syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
  			exit(1);
  		}
  
  #ifdef VIRTUAL_HOSTING
  		if (his_addr.su_family == AF_INET6 &&
  		    IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))
  			family = AF_INET;
  		else
  			family = his_addr.su_family;
  		inithosts(family);
  #endif
  	}
  
  gotchild:
  	sa.sa_handler = SIG_DFL;
  	sigaction(SIGCHLD, &sa, NULL);
  
  	sa.sa_handler = sigurg;
  	sa.sa_flags = 0;		/* don't restart syscalls for SIGURG */
  	sigaction(SIGURG, &sa, NULL);
  
  	sigfillset(&sa.sa_mask);	/* block all signals in handler */
  	sa.sa_flags = SA_RESTART;
  	sa.sa_handler = sigquit;
  	sigaction(SIGHUP, &sa, NULL);
  	sigaction(SIGINT, &sa, NULL);
  	sigaction(SIGQUIT, &sa, NULL);
  	sigaction(SIGTERM, &sa, NULL);
  
  	sa.sa_handler = lostconn;
  	sigaction(SIGPIPE, &sa, NULL);
  
  	addrlen = sizeof(ctrl_addr);
  	if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
  		syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
  		exit(1);
  	}
  	dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
  #ifdef VIRTUAL_HOSTING
  	/* select our identity from virtual host table */
  	selecthost(&ctrl_addr);
  #endif
  #ifdef IP_TOS
  	if (ctrl_addr.su_family == AF_INET)
        {
  	tos = IPTOS_LOWDELAY;
  	if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
  		syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
        }
  #endif
  	/*
  	 * Disable Nagle on the control channel so that we don't have to wait
  	 * for peer's ACK before issuing our next reply.
  	 */
  	if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
  		syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
  
  	data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
  
  	/* set this here so klogin can use it... */
  	snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
  
  	/* Try to handle urgent data inline */
  #ifdef SO_OOBINLINE
  	if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
  		syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
  #endif
  
  #ifdef	F_SETOWN
  	if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
  		syslog(LOG_ERR, "fcntl F_SETOWN: %m");
  #endif
  	dolog((struct sockaddr *)&his_addr);
  	/*
  	 * Set up default state
  	 */
  	data = -1;
  	type = TYPE_A;
  	form = FORM_N;
  	stru = STRU_F;
  	mode = MODE_S;
  	tmpline[0] = '\0';
  
  	/* If logins are disabled, print out the message. */
  	if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
  		while (fgets(line, sizeof(line), fd) != NULL) {
  			if ((cp = strchr(line, '\n')) != NULL)
  				*cp = '\0';
  			lreply(530, "%s", line);
  		}
  		fflush(stdout);
  		fclose(fd);
  		reply(530, "System not available.");
  		exit(0);
  	}
  #ifdef VIRTUAL_HOSTING
  	fd = fopen(thishost->welcome, "r");
  #else
  	fd = fopen(_PATH_FTPWELCOME, "r");
  #endif
  	if (fd != NULL) {
  		while (fgets(line, sizeof(line), fd) != NULL) {
  			if ((cp = strchr(line, '\n')) != NULL)
  				*cp = '\0';
  			lreply(220, "%s", line);
  		}
  		fflush(stdout);
  		fclose(fd);
  		/* reply(220,) must follow */
  	}
  #ifndef VIRTUAL_HOSTING
  	if (hostname == NULL) {
  		if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
  			fatalerror("Ran out of memory.");
  		if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
  			hostname[0] = '\0';
  		hostname[MAXHOSTNAMELEN - 1] = '\0';
  	}
  #endif
  	if (hostinfo)
  		reply(220, "%s FTP server (%s) ready.", hostname, version);
  	else
  		reply(220, "FTP server ready.");
  	for (;;)
  		yyparse();
  	/* NOTREACHED */
  }
  
  static void
  lostconn(int signo)
  {
  
  	if (ftpdebug)
  		syslog(LOG_DEBUG, "lost connection");
  	dologout(1);
  }
  
  static void
  sigquit(int signo)
  {
  
  	syslog(LOG_ERR, "got signal %d", signo);
  	dologout(1);
  }
  
  #ifdef VIRTUAL_HOSTING
  /*
   * read in virtual host tables (if they exist)
   */
  
  static void
  inithosts(int family)
  {
  	int insert;
  	size_t len;
  	FILE *fp;
  	char *cp, *mp, *line;
  	char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
  	struct ftphost *hrp, *lhrp;
  	struct addrinfo hints, *res, *ai;
  
  	/*
  	 * Fill in the default host information
  	 */
  	if (hostname == NULL) {
  		if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
  			fatalerror("Ran out of memory.");
  		if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
  			hostname[0] = '\0';
  		hostname[MAXHOSTNAMELEN - 1] = '\0';
  	}
  	if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
  		fatalerror("Ran out of memory.");
  	hrp->hostname = hostname;
  	hrp->hostinfo = NULL;
  
  	memset(&hints, 0, sizeof(hints));
  	hints.ai_flags = AI_PASSIVE;
  	hints.ai_family = family;
  	hints.ai_socktype = SOCK_STREAM;
  	if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
  		hrp->hostinfo = res;
  	hrp->statfile = _PATH_FTPDSTATFILE;
  	hrp->welcome  = _PATH_FTPWELCOME;
  	hrp->loginmsg = _PATH_FTPLOGINMESG;
  	hrp->anonuser = "ftp";
  	hrp->next = NULL;
  	thishost = firsthost = lhrp = hrp;
  	if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
  		int addrsize, gothost;
  		void *addr;
  		struct hostent *hp;
  
  		while ((line = fgetln(fp, &len)) != NULL) {
  			int	i, hp_error;
  
  			/* skip comments */
  			if (line[0] == '#')
  				continue;
  			if (line[len - 1] == '\n') {
  				line[len - 1] = '\0';
  				mp = NULL;
  			} else {
  				if ((mp = malloc(len + 1)) == NULL)
  					fatalerror("Ran out of memory.");
  				memcpy(mp, line, len);
  				mp[len] = '\0';
  				line = mp;
  			}
  			cp = strtok(line, " \t");
  			/* skip empty lines */
  			if (cp == NULL)
  				goto nextline;
  			vhost = cp;
  
  			/* set defaults */
  			anonuser = "ftp";
  			statfile = _PATH_FTPDSTATFILE;
  			welcome  = _PATH_FTPWELCOME;
  			loginmsg = _PATH_FTPLOGINMESG;
  
  			/*
  			 * Preparse the line so we can use its info
  			 * for all the addresses associated with
  			 * the virtual host name.
  			 * Field 0, the virtual host name, is special:
  			 * it's already parsed off and will be strdup'ed
  			 * later, after we know its canonical form.
  			 */
  			for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
  				if (*cp != '-' && (cp = strdup(cp)))
  					switch (i) {
  					case 1:	/* anon user permissions */
  						anonuser = cp;
  						break;
  					case 2: /* statistics file */
  						statfile = cp;
  						break;
  					case 3: /* welcome message */
  						welcome  = cp;
  						break;
  					case 4: /* login message */
  						loginmsg = cp;
  						break;
  					default: /* programming error */
  						abort();
  						/* NOTREACHED */
  					}
  
  			hints.ai_flags = AI_PASSIVE;
  			hints.ai_family = family;
  			hints.ai_socktype = SOCK_STREAM;
  			if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
  				goto nextline;
  			for (ai = res; ai != NULL && ai->ai_addr != NULL;
  			     ai = ai->ai_next) {
  
  			gothost = 0;
  			for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
  				struct addrinfo *hi;
  
  				for (hi = hrp->hostinfo; hi != NULL;
  				     hi = hi->ai_next)
  					if (hi->ai_addrlen == ai->ai_addrlen &&
  					    memcmp(hi->ai_addr,
  						   ai->ai_addr,
  						   ai->ai_addr->sa_len) == 0) {
  						gothost++;
  						break;
  					}
  				if (gothost)
  					break;
  			}
  			if (hrp == NULL) {
  				if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
  					goto nextline;
  				hrp->hostname = NULL;
  				insert = 1;
  			} else {
  				if (hrp->hostinfo && hrp->hostinfo != res)
  					freeaddrinfo(hrp->hostinfo);
  				insert = 0; /* host already in the chain */
  			}
  			hrp->hostinfo = res;
  
  			/*
  			 * determine hostname to use.
  			 * force defined name if there is a valid alias
  			 * otherwise fallback to primary hostname
  			 */
  			/* XXX: getaddrinfo() can't do alias check */
  			switch(hrp->hostinfo->ai_family) {
  			case AF_INET:
  				addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
  				addrsize = sizeof(struct in_addr);
  				break;
  			case AF_INET6:
  				addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
  				addrsize = sizeof(struct in6_addr);
  				break;
  			default:
  				/* should not reach here */
  				freeaddrinfo(hrp->hostinfo);
  				if (insert)
  					free(hrp); /*not in chain, can free*/
  				else
  					hrp->hostinfo = NULL; /*mark as blank*/
  				goto nextline;
  				/* NOTREACHED */
  			}
  			if ((hp = getipnodebyaddr(addr, addrsize,
  						  hrp->hostinfo->ai_family,
  						  &hp_error)) != NULL) {
  				if (strcmp(vhost, hp->h_name) != 0) {
  					if (hp->h_aliases == NULL)
  						vhost = hp->h_name;
  					else {
  						i = 0;
  						while (hp->h_aliases[i] &&
  						       strcmp(vhost, hp->h_aliases[i]) != 0)
  							++i;
  						if (hp->h_aliases[i] == NULL)
  							vhost = hp->h_name;
  					}
  				}
  			}
  			if (hrp->hostname &&
  			    strcmp(hrp->hostname, vhost) != 0) {
  				free(hrp->hostname);
  				hrp->hostname = NULL;
  			}
  			if (hrp->hostname == NULL &&
  			    (hrp->hostname = strdup(vhost)) == NULL) {
  				freeaddrinfo(hrp->hostinfo);
  				hrp->hostinfo = NULL; /* mark as blank */
  				if (hp)
  					freehostent(hp);
  				goto nextline;
  			}
  			hrp->anonuser = anonuser;
  			hrp->statfile = statfile;
  			hrp->welcome  = welcome;
  			hrp->loginmsg = loginmsg;
  			if (insert) {
  				hrp->next  = NULL;
  				lhrp->next = hrp;
  				lhrp = hrp;
  			}
  			if (hp)
  				freehostent(hp);
  		      }
  nextline:
  			if (mp)
  				free(mp);
  		}
  		fclose(fp);
  	}
  }
  
  static void
  selecthost(union sockunion *su)
  {
  	struct ftphost	*hrp;
  	u_int16_t port;
  #ifdef INET6
  	struct in6_addr *mapped_in6 = NULL;
  #endif
  	struct addrinfo *hi;
  
  #ifdef INET6
  	/*
  	 * XXX IPv4 mapped IPv6 addr consideraton,
  	 * specified in rfc2373.
  	 */
  	if (su->su_family == AF_INET6 &&
  	    IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
  		mapped_in6 = &su->su_sin6.sin6_addr;
  #endif
  
  	hrp = thishost = firsthost;	/* default */
  	port = su->su_port;
  	su->su_port = 0;
  	while (hrp != NULL) {
  	    for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
  		if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
  			thishost = hrp;
  			goto found;
  		}
  #ifdef INET6
  		/* XXX IPv4 mapped IPv6 addr consideraton */
  		if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
  		    (memcmp(&mapped_in6->s6_addr[12],
  			    &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
  			    sizeof(struct in_addr)) == 0)) {
  			thishost = hrp;
  			goto found;
  		}
  #endif
  	    }
  	    hrp = hrp->next;
  	}
  found:
  	su->su_port = port;
  	/* setup static variables as appropriate */
  	hostname = thishost->hostname;
  	ftpuser = thishost->anonuser;
  }
  #endif
  
  /*
   * Helper function for sgetpwnam().
   */
  static char *
  sgetsave(char *s)
  {
  	char *new = malloc(strlen(s) + 1);
  
  	if (new == NULL) {
  		reply(421, "Ran out of memory.");
  		dologout(1);
  		/* NOTREACHED */
  	}
  	strcpy(new, s);
  	return (new);
  }
  
  /*
   * Save the result of a getpwnam.  Used for USER command, since
   * the data returned must not be clobbered by any other command
   * (e.g., globbing).
   * NB: The data returned by sgetpwnam() will remain valid until
   * the next call to this function.  Its difference from getpwnam()
   * is that sgetpwnam() is known to be called from ftpd code only.
   */
  static struct passwd *
  sgetpwnam(char *name)
  {
  	static struct passwd save;
  	struct passwd *p;
  
  	if ((p = getpwnam(name)) == NULL)
  		return (p);
  	if (save.pw_name) {
  		free(save.pw_name);
  		free(save.pw_passwd);
  		free(save.pw_gecos);
  		free(save.pw_dir);
  		free(save.pw_shell);
  	}
  	save = *p;
  	save.pw_name = sgetsave(p->pw_name);
  	save.pw_passwd = sgetsave(p->pw_passwd);
  	save.pw_gecos = sgetsave(p->pw_gecos);
  	save.pw_dir = sgetsave(p->pw_dir);
  	save.pw_shell = sgetsave(p->pw_shell);
  	return (&save);
  }
  
  static int login_attempts;	/* number of failed login attempts */
  static int askpasswd;		/* had user command, ask for passwd */
  static char curname[MAXLOGNAME];	/* current USER name */
  
  /*
   * USER command.
   * Sets global passwd pointer pw if named account exists and is acceptable;
   * sets askpasswd if a PASS command is expected.  If logged in previously,
   * need to reset state.  If name is "ftp" or "anonymous", the name is not in
   * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
   * If account doesn't exist, ask for passwd anyway.  Otherwise, check user
   * requesting login privileges.  Disallow anyone who does not have a standard
   * shell as returned by getusershell().  Disallow anyone mentioned in the file
   * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
   */
  void
  user(char *name)
  {
  	char *cp, *shell;
  
  	if (logged_in) {
  		if (guest) {
  			reply(530, "Can't change user from guest login.");
  			return;
  		} else if (dochroot) {
  			reply(530, "Can't change user from chroot user.");
  			return;
  		}
  		end_login();
  	}
  
  	guest = 0;
  #ifdef VIRTUAL_HOSTING
  	pw = sgetpwnam(thishost->anonuser);
  #else
  	pw = sgetpwnam("ftp");
  #endif
  	if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
  		if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
  		    checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
  			reply(530, "User %s access denied.", name);
  		else if (pw != NULL) {
  			guest = 1;
  			askpasswd = 1;
  			reply(331,
  			"Guest login ok, send your email address as password.");
  		} else
  			reply(530, "User %s unknown.", name);
  		if (!askpasswd && logging)
  			syslog(LOG_NOTICE,
  			    "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
  		return;
  	}
  	if (anon_only != 0) {
  		reply(530, "Sorry, only anonymous ftp allowed.");
  		return;
  	}
  		
  	if ((pw = sgetpwnam(name))) {
  		if ((shell = pw->pw_shell) == NULL || *shell == 0)
  			shell = _PATH_BSHELL;
  		setusershell();
  		while ((cp = getusershell()) != NULL)
  			if (strcmp(cp, shell) == 0)
  				break;
  		endusershell();
  
  		if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
  			reply(530, "User %s access denied.", name);
  			if (logging)
  				syslog(LOG_NOTICE,
  				    "FTP LOGIN REFUSED FROM %s, %s",
  				    remotehost, name);
  			pw = NULL;
  			return;
  		}
  	}
  	if (logging)
  		strncpy(curname, name, sizeof(curname)-1);
  
  	pwok = 0;
  #ifdef USE_PAM
  	/* XXX Kluge! The conversation mechanism needs to be fixed. */
  #endif
  	if (opiechallenge(&opiedata, name, opieprompt) == 0) {
  		pwok = (pw != NULL) &&
  		       opieaccessfile(remotehost) &&
  		       opiealways(pw->pw_dir);
  		reply(331, "Response to %s %s for %s.",
  		      opieprompt, pwok ? "requested" : "required", name);
  	} else {
  		pwok = 1;
  		reply(331, "Password required for %s.", name);
  	}
  	askpasswd = 1;
  	/*
  	 * Delay before reading passwd after first failed
  	 * attempt to slow down passwd-guessing programs.
  	 */
  	if (login_attempts)
  		sleep(login_attempts);
  }
  
  /*
   * Check if a user is in the file "fname",
   * return a pointer to a malloc'd string with the rest
   * of the matching line in "residue" if not NULL.
   */
  static int
  checkuser(char *fname, char *name, int pwset, char **residue)
  {
  	FILE *fd;
  	int found = 0;
  	size_t len;
  	char *line, *mp, *p;
  
  	if ((fd = fopen(fname, "r")) != NULL) {
  		while (!found && (line = fgetln(fd, &len)) != NULL) {
  			/* skip comments */
  			if (line[0] == '#')
  				continue;
  			if (line[len - 1] == '\n') {
  				line[len - 1] = '\0';
  				mp = NULL;
  			} else {
  				if ((mp = malloc(len + 1)) == NULL)
  					fatalerror("Ran out of memory.");
  				memcpy(mp, line, len);
  				mp[len] = '\0';
  				line = mp;
  			}
  			/* avoid possible leading and trailing whitespace */
  			p = strtok(line, " \t");
  			/* skip empty lines */
  			if (p == NULL)
  				goto nextline;
  			/*
  			 * if first chr is '@', check group membership
  			 */
  			if (p[0] == '@') {
  				int i = 0;
  				struct group *grp;
  
  				if (p[1] == '\0') /* single @ matches anyone */
  					found = 1;
  				else {
  					if ((grp = getgrnam(p+1)) == NULL)
  						goto nextline;
  					/*
  					 * Check user's default group
  					 */
  					if (pwset && grp->gr_gid == pw->pw_gid)
  						found = 1;
  					/*
  					 * Check supplementary groups
  					 */
  					while (!found && grp->gr_mem[i])
  						found = strcmp(name,
  							grp->gr_mem[i++])
  							== 0;
  				}
  			}
  			/*
  			 * Otherwise, just check for username match
  			 */
  			else
  				found = strcmp(p, name) == 0;
  			/*
  			 * Save the rest of line to "residue" if matched
  			 */
  			if (found && residue) {
  				if ((p = strtok(NULL, "")) != NULL)
  					p += strspn(p, " \t");
  				if (p && *p) {
  				 	if ((*residue = strdup(p)) == NULL)
  						fatalerror("Ran out of memory.");
  				} else
  					*residue = NULL;
  			}
  nextline:
  			if (mp)
  				free(mp);
  		}
  		fclose(fd);
  	}
  	return (found);
  }
  
  /*
   * Terminate login as previous user, if any, resetting state;
   * used when USER command is given or login fails.
   */
  static void
  end_login(void)
  {
  #ifdef USE_PAM
  	int e;
  #endif
  
  	seteuid(0);
  	if (logged_in && dowtmp)
  		ftpd_logwtmp(ttyline, "", NULL);
  	pw = NULL;
  #ifdef	LOGIN_CAP
  	/* XXX Missing LOGIN_SETMAC */
  	setusercontext(NULL, getpwuid(0), 0,
  		       LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK);
  #endif
  #ifdef USE_PAM
  	if (pamh) {
  		if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS)
  			syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
  		if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS)
  			syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e));
  		if ((e = pam_end(pamh, e)) != PAM_SUCCESS)
  			syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
  		pamh = NULL;
  	}
  #endif
  	logged_in = 0;
  	guest = 0;
  	dochroot = 0;
  }
  
  #ifdef USE_PAM
  
  /*
   * the following code is stolen from imap-uw PAM authentication module and
   * login.c
   */
  #define COPY_STRING(s) (s ? strdup(s) : NULL)
  
  struct cred_t {
  	const char *uname;		/* user name */
  	const char *pass;		/* password */
  };
  typedef struct cred_t cred_t;
  
  static int
  auth_conv(int num_msg, const struct pam_message **msg,
  	  struct pam_response **resp, void *appdata)
  {
  	int i;
  	cred_t *cred = (cred_t *) appdata;
  	struct pam_response *reply;
  
  	reply = calloc(num_msg, sizeof *reply);
  	if (reply == NULL)
  		return PAM_BUF_ERR;
  
  	for (i = 0; i < num_msg; i++) {
  		switch (msg[i]->msg_style) {
  		case PAM_PROMPT_ECHO_ON:	/* assume want user name */
  			reply[i].resp_retcode = PAM_SUCCESS;
  			reply[i].resp = COPY_STRING(cred->uname);
  			/* PAM frees resp. */
  			break;
  		case PAM_PROMPT_ECHO_OFF:	/* assume want password */
  			reply[i].resp_retcode = PAM_SUCCESS;
  			reply[i].resp = COPY_STRING(cred->pass);
  			/* PAM frees resp. */
  			break;
  		case PAM_TEXT_INFO:
  		case PAM_ERROR_MSG:
  			reply[i].resp_retcode = PAM_SUCCESS;
  			reply[i].resp = NULL;
  			break;
  		default:			/* unknown message style */
  			free(reply);
  			return PAM_CONV_ERR;
  		}
  	}
  
  	*resp = reply;
  	return PAM_SUCCESS;
  }
  
  /*
   * Attempt to authenticate the user using PAM.  Returns 0 if the user is
   * authenticated, or 1 if not authenticated.  If some sort of PAM system
   * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
   * function returns -1.  This can be used as an indication that we should
   * fall back to a different authentication mechanism.
   */
  static int
  auth_pam(struct passwd **ppw, const char *pass)
  {
  	const char *tmpl_user;
  	const void *item;
  	int rval;
  	int e;
  	cred_t auth_cred = { (*ppw)->pw_name, pass };
  	struct pam_conv conv = { &auth_conv, &auth_cred };
  
  	e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
  	if (e != PAM_SUCCESS) {
  		/*
  		 * In OpenPAM, it's OK to pass NULL to pam_strerror()
  		 * if context creation has failed in the first place.
  		 */
  		syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e));
  		return -1;
  	}
  
  	e = pam_set_item(pamh, PAM_RHOST, remotehost);
  	if (e != PAM_SUCCESS) {
  		syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
  			pam_strerror(pamh, e));
  		if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
  			syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
  		}
  		pamh = NULL;
  		return -1;
  	}
  
  	e = pam_authenticate(pamh, 0);
  	switch (e) {
  	case PAM_SUCCESS:
  		/*
  		 * With PAM we support the concept of a "template"
  		 * user.  The user enters a login name which is
  		 * authenticated by PAM, usually via a remote service
  		 * such as RADIUS or TACACS+.  If authentication
  		 * succeeds, a different but related "template" name
  		 * is used for setting the credentials, shell, and
  		 * home directory.  The name the user enters need only
  		 * exist on the remote authentication server, but the
  		 * template name must be present in the local password
  		 * database.
  		 *
  		 * This is supported by two various mechanisms in the
  		 * individual modules.  However, from the application's
  		 * point of view, the template user is always passed
  		 * back as a changed value of the PAM_USER item.
  		 */
  		if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
  		    PAM_SUCCESS) {
  			tmpl_user = (const char *) item;
  			if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
  				*ppw = getpwnam(tmpl_user);
  		} else
  			syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
  			    pam_strerror(pamh, e));
  		rval = 0;
  		break;
  
  	case PAM_AUTH_ERR:
  	case PAM_USER_UNKNOWN:
  	case PAM_MAXTRIES:
  		rval = 1;
  		break;
  
  	default:
  		syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
  		rval = -1;
  		break;
  	}
  
  	if (rval == 0) {
  		e = pam_acct_mgmt(pamh, 0);
  		if (e != PAM_SUCCESS) {
  			syslog(LOG_ERR, "pam_acct_mgmt: %s",
  						pam_strerror(pamh, e));
  			rval = 1;
  		}
  	}
  
  	if (rval != 0) {
  		if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
  			syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
  		}
  		pamh = NULL;
  	}
  	return rval;
  }
  
  #endif /* USE_PAM */
  
  void
  pass(char *passwd)
  {
  	int rval;
  	FILE *fd;
  #ifdef	LOGIN_CAP
  	login_cap_t *lc = NULL;
  #endif
  #ifdef USE_PAM
  	int e;
  #endif
  	char *residue = NULL;
  	char *xpasswd;
  
  	if (logged_in || askpasswd == 0) {
  		reply(503, "Login with USER first.");
  		return;
  	}
  	askpasswd = 0;
  	if (!guest) {		/* "ftp" is only account allowed no password */
  		if (pw == NULL) {
  			rval = 1;	/* failure below */
  			goto skip;
  		}
  #ifdef USE_PAM
  		rval = auth_pam(&pw, passwd);
  		if (rval >= 0) {
  			opieunlock();
  			goto skip;
  		}
  #endif
  		if (opieverify(&opiedata, passwd) == 0)
  			xpasswd = pw->pw_passwd;
  		else if (pwok) {
  			xpasswd = crypt(passwd, pw->pw_passwd);
  			if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0')
  				xpasswd = ":";
  		} else {
  			rval = 1;
  			goto skip;
  		}
  		rval = strcmp(pw->pw_passwd, xpasswd);
  		if (pw->pw_expire && time(NULL) >= pw->pw_expire)
  			rval = 1;	/* failure */
  skip:
  		/*
  		 * If rval == 1, the user failed the authentication check
  		 * above.  If rval == 0, either PAM or local authentication
  		 * succeeded.
  		 */
  		if (rval) {
  			reply(530, "Login incorrect.");
  			if (logging) {
  				syslog(LOG_NOTICE,
  				    "FTP LOGIN FAILED FROM %s",
  				    remotehost);
  				syslog(LOG_AUTHPRIV | LOG_NOTICE,
  				    "FTP LOGIN FAILED FROM %s, %s",
  				    remotehost, curname);
  			}
  			pw = NULL;
  			if (login_attempts++ >= 5) {
  				syslog(LOG_NOTICE,
  				    "repeated login failures from %s",
  				    remotehost);
  				exit(0);
  			}
  			return;
  		}
  	}
  	login_attempts = 0;		/* this time successful */
  	if (setegid(pw->pw_gid) < 0) {
  		reply(550, "Can't set gid.");
  		return;
  	}
  	/* May be overridden by login.conf */
  	umask(defumask);
  #ifdef	LOGIN_CAP
  	if ((lc = login_getpwclass(pw)) != NULL) {
  		char	remote_ip[NI_MAXHOST];
  
  		if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
  			remote_ip, sizeof(remote_ip) - 1, NULL, 0,
  			NI_NUMERICHOST))
  				*remote_ip = 0;
  		remote_ip[sizeof(remote_ip) - 1] = 0;
  		if (!auth_hostok(lc, remotehost, remote_ip)) {
  			syslog(LOG_INFO|LOG_AUTH,
  			    "FTP LOGIN FAILED (HOST) as %s: permission denied.",
  			    pw->pw_name);
  			reply(530, "Permission denied.");
  			pw = NULL;
  			return;
  		}
  		if (!auth_timeok(lc, time(NULL))) {
  			reply(530, "Login not available right now.");
  			pw = NULL;
  			return;
  		}
  	}
  	/* XXX Missing LOGIN_SETMAC */
  	setusercontext(lc, pw, 0,
  		LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
  		LOGIN_SETRESOURCES|LOGIN_SETUMASK);
  #else
  	setlogin(pw->pw_name);
  	initgroups(pw->pw_name, pw->pw_gid);
  #endif
  
  #ifdef USE_PAM
  	if (pamh) {
  		if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
  			syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e));
  		} else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) {
  			syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
  		}
  	}
  #endif
  
  	/* open wtmp before chroot */
  	if (dowtmp)
  		ftpd_logwtmp(ttyline, pw->pw_name,
  		    (struct sockaddr *)&his_addr);
  	logged_in = 1;
  
  	if (guest && stats && statfd < 0)
  #ifdef VIRTUAL_HOSTING
  		statfd = open(thishost->statfile, O_WRONLY|O_APPEND);
  #else
  		statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND);
  #endif
  		if (statfd < 0)
  			stats = 0;
  
  	dochroot =
  		checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
  #ifdef	LOGIN_CAP	/* Allow login.conf configuration as well */
  		|| login_getcapbool(lc, "ftp-chroot", 0)
  #endif
  	;
  	chrootdir = NULL;
  	/*
  	 * For a chrooted local user,
  	 * a) see whether ftpchroot(5) specifies a chroot directory,
  	 * b) extract the directory pathname from the line,
  	 * c) expand it to the absolute pathname if necessary.
  	 */
  	if (dochroot && residue &&
  	    (chrootdir = strtok(residue, " \t")) != NULL) {
  		if (chrootdir[0] != '/')
  			asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
  		else
  			chrootdir = strdup(chrootdir); /* make it permanent */
  		if (chrootdir == NULL)
  			fatalerror("Ran out of memory.");
  	}
  	if (guest || dochroot) {
  		/*
  		 * If no chroot directory set yet, use the login directory.
  		 * Copy it so it can be modified while pw->pw_dir stays intact.
  		 */
  		if (chrootdir == NULL &&
  		    (chrootdir = strdup(pw->pw_dir)) == NULL)
  			fatalerror("Ran out of memory.");
  		/*
  		 * Check for the "/chroot/./home" syntax,
  		 * separate the chroot and home directory pathnames.
  		 */
  		if ((homedir = strstr(chrootdir, "/./")) != NULL) {
  			*(homedir++) = '\0';	/* wipe '/' */
  			homedir++;		/* skip '.' */
  		} else {
  			/*
  			 * We MUST do a chdir() after the chroot. Otherwise
  			 * the old current directory will be accessible as "."
  			 * outside the new root!
  			 */
  			homedir = "/";
  		}
  		/*
  		 * Finally, do chroot()
  		 */
  		if (chroot(chrootdir) < 0) {
  			reply(550, "Can't change root.");
  			goto bad;
  		}
  	} else	/* real user w/o chroot */
  		homedir = pw->pw_dir;
  	/*
  	 * Set euid *before* doing chdir() so
  	 * a) the user won't be carried to a directory that he couldn't reach
  	 *    on his own due to no permission to upper path components,
  	 * b) NFS mounted homedirs w/restrictive permissions will be accessible
  	 *    (uid 0 has no root power over NFS if not mapped explicitly.)
  	 */
  	if (seteuid(pw->pw_uid) < 0) {
  		reply(550, "Can't set uid.");
  		goto bad;
  	}
  	if (chdir(homedir) < 0) {
  		if (guest || dochroot) {
  			reply(550, "Can't change to base directory.");
  			goto bad;
  		} else {
  			if (chdir("/") < 0) {
  				reply(550, "Root is inaccessible.");
  				goto bad;
  			}
  			lreply(230, "No directory! Logging in with home=/.");
  		}
  	}
  
  	/*
  	 * Display a login message, if it exists.
  	 * N.B. reply(230,) must follow the message.
  	 */
  #ifdef VIRTUAL_HOSTING
  	fd = fopen(thishost->loginmsg, "r");
  #else
  	fd = fopen(_PATH_FTPLOGINMESG, "r");
  #endif
  	if (fd != NULL) {
  		char *cp, line[LINE_MAX];
  
  		while (fgets(line, sizeof(line), fd) != NULL) {
  			if ((cp = strchr(line, '\n')) != NULL)
  				*cp = '\0';
  			lreply(230, "%s", line);
  		}
  		fflush(stdout);
  		fclose(fd);
  	}
  	if (guest) {
  		if (ident != NULL)
  			free(ident);
  		ident = strdup(passwd);
  		if (ident == NULL)
  			fatalerror("Ran out of memory.");
  
  		reply(230, "Guest login ok, access restrictions apply.");
  #ifdef SETPROCTITLE
  #ifdef VIRTUAL_HOSTING
  		if (thishost != firsthost)
  			snprintf(proctitle, sizeof(proctitle),
  				 "%s: anonymous(%s)/%s", remotehost, hostname,
  				 passwd);
  		else
  #endif
  			snprintf(proctitle, sizeof(proctitle),
  				 "%s: anonymous/%s", remotehost, passwd);
  		setproctitle("%s", proctitle);
  #endif /* SETPROCTITLE */
  		if (logging)
  			syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
  			    remotehost, passwd);
  	} else {
  		if (dochroot)
  			reply(230, "User %s logged in, "
  				   "access restrictions apply.", pw->pw_name);
  		else
  			reply(230, "User %s logged in.", pw->pw_name);
  
  #ifdef SETPROCTITLE
  		snprintf(proctitle, sizeof(proctitle),
  			 "%s: user/%s", remotehost, pw->pw_name);
  		setproctitle("%s", proctitle);
  #endif /* SETPROCTITLE */
  		if (logging)
  			syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
  			    remotehost, pw->pw_name);
  	}
  	if (logging && (guest || dochroot))
  		syslog(LOG_INFO, "session root changed to %s", chrootdir);
  #ifdef	LOGIN_CAP
  	login_close(lc);
  #endif
  	if (residue)
  		free(residue);
  	return;
  bad:
  	/* Forget all about it... */
  #ifdef	LOGIN_CAP
  	login_close(lc);
  #endif
  	if (residue)
  		free(residue);
  	end_login();
  }
  
  void
  retrieve(char *cmd, char *name)
  {
  	FILE *fin, *dout;
  	struct stat st;
  	int (*closefunc)(FILE *);
  	time_t start;
  
  	if (cmd == NULL) {
  		fin = fopen(name, "r"), closefunc = fclose;
  		st.st_size = 0;
  	} else {
  		char line[BUFSIZ];
  
  		snprintf(line, sizeof(line), cmd, name), name = line;
  		fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
  		st.st_size = -1;
  		st.st_blksize = BUFSIZ;
  	}
  	if (fin == NULL) {
  		if (errno != 0) {
  			perror_reply(550, name);
  			if (cmd == NULL) {
  				LOGCMD("get", name);
  			}
  		}
  		return;
  	}
  	byte_count = -1;
  	if (cmd == NULL) {
  		if (fstat(fileno(fin), &st) < 0) {
  			perror_reply(550, name);
  			goto done;
  		}
  		if (!S_ISREG(st.st_mode)) {
  			/*
  			 * Never sending a raw directory is a workaround
  			 * for buggy clients that will attempt to RETR
  			 * a directory before listing it, e.g., Mozilla.
  			 * Preventing a guest from getting irregular files
  			 * is a simple security measure.
  			 */
  			if (S_ISDIR(st.st_mode) || guest) {
  				reply(550, "%s: not a plain file.", name);
  				goto done;
  			}
  			st.st_size = -1;
  			/* st.st_blksize is set for all descriptor types */
  		}
  	}
  	if (restart_point) {
  		if (type == TYPE_A) {
  			off_t i, n;
  			int c;
  
  			n = restart_point;
  			i = 0;
  			while (i++ < n) {
  				if ((c=getc(fin)) == EOF) {
  					perror_reply(550, name);
  					goto done;
  				}
  				if (c == '\n')
  					i++;
  			}
  		} else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
  			perror_reply(550, name);
  			goto done;
  		}
  	}
  	dout = dataconn(name, st.st_size, "w");
  	if (dout == NULL)
  		goto done;
  	time(&start);
  	send_data(fin, dout, st.st_blksize, st.st_size,
  		  restart_point == 0 && cmd == NULL && S_ISREG(st.st_mode));
  	if (cmd == NULL && guest && stats && byte_count > 0)
  		logxfer(name, byte_count, start);
  	fclose(dout);
  	data = -1;
  	pdata = -1;
  done:
  	if (cmd == NULL)
  		LOGBYTES("get", name, byte_count);
  	(*closefunc)(fin);
  }
  
  void
  store(char *name, char *mode, int unique)
  {
  	int fd;
  	FILE *fout, *din;
  	int (*closefunc)(FILE *);
  
  	if (*mode == 'a') {		/* APPE */
  		if (unique) {
  			/* Programming error */
  			syslog(LOG_ERR, "Internal: unique flag to APPE");
  			unique = 0;
  		}
  		if (guest && noguestmod) {
  			reply(550, "Appending to existing file denied.");
  			goto err;
  		}
  		restart_point = 0;	/* not affected by preceding REST */
  	}
  	if (unique)			/* STOU overrides REST */
  		restart_point = 0;
  	if (guest && noguestmod) {
  		if (restart_point) {	/* guest STOR w/REST */
  			reply(550, "Modifying existing file denied.");
  			goto err;
  		} else			/* treat guest STOR as STOU */
  			unique = 1;
  	}
  
  	if (restart_point)
  		mode = "r+";	/* so ASCII manual seek can work */
  	if (unique) {
  		if ((fd = guniquefd(name, &name)) < 0)
  			goto err;
  		fout = fdopen(fd, mode);
  	} else
  		fout = fopen(name, mode);
  	closefunc = fclose;
  	if (fout == NULL) {
  		perror_reply(553, name);
  		goto err;
  	}
  	byte_count = -1;
  	if (restart_point) {
  		if (type == TYPE_A) {
  			off_t i, n;
  			int c;
  
  			n = restart_point;
  			i = 0;
  			while (i++ < n) {
  				if ((c=getc(fout)) == EOF) {
  					perror_reply(550, name);
  					goto done;
  				}
  				if (c == '\n')
  					i++;
  			}
  			/*
  			 * We must do this seek to "current" position
  			 * because we are changing from reading to
  			 * writing.
  			 */
  			if (fseeko(fout, 0, SEEK_CUR) < 0) {
  				perror_reply(550, name);
  				goto done;
  			}
  		} else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
  			perror_reply(550, name);
  			goto done;
  		}
  	}
  	din = dataconn(name, -1, "r");
  	if (din == NULL)
  		goto done;
  	if (receive_data(din, fout) == 0) {
  		if (unique)
  			reply(226, "Transfer complete (unique file name:%s).",
  			    name);
  		else
  			reply(226, "Transfer complete.");
  	}
  	fclose(din);
  	data = -1;
  	pdata = -1;
  done:
  	LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
  	(*closefunc)(fout);
  	return;
  err:
  	LOGCMD(*mode == 'a' ? "append" : "put" , name);
  	return;
  }
  
  static FILE *
  getdatasock(char *mode)
  {
  	int on = 1, s, t, tries;
  
  	if (data >= 0)
  		return (fdopen(data, mode));
  
  	s = socket(data_dest.su_family, SOCK_STREAM, 0);
  	if (s < 0)
  		goto bad;
  	if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
  		syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
  	/* anchor socket to avoid multi-homing problems */
  	data_source = ctrl_addr;
  	data_source.su_port = htons(dataport);
  	seteuid(0);
  	for (tries = 1; ; tries++) {
  		/*
  		 * We should loop here since it's possible that
  		 * another ftpd instance has passed this point and is
  		 * trying to open a data connection in active mode now.
  		 * Until the other connection is opened, we'll be getting
  		 * EADDRINUSE because no SOCK_STREAM sockets in the system
  		 * can share both local and remote addresses, localIP:20
  		 * and *:* in this case.
  		 */
  		if (bind(s, (struct sockaddr *)&data_source,
  		    data_source.su_len) >= 0)
  			break;
  		if (errno != EADDRINUSE || tries > 10)
  			goto bad;
  		sleep(tries);
  	}
  	seteuid(pw->pw_uid);
  #ifdef IP_TOS
  	if (data_source.su_family == AF_INET)
        {
  	on = IPTOS_THROUGHPUT;
  	if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
  		syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
        }
  #endif
  #ifdef TCP_NOPUSH
  	/*
  	 * Turn off push flag to keep sender TCP from sending short packets
  	 * at the boundaries of each write().
  	 */
  	on = 1;
  	if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
  		syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
  #endif
  	return (fdopen(s, mode));
  bad:
  	/* Return the real value of errno (close may change it) */
  	t = errno;
  	seteuid(pw->pw_uid);
  	close(s);
  	errno = t;
  	return (NULL);
  }
  
  static FILE *
  dataconn(char *name, off_t size, char *mode)
  {
  	char sizebuf[32];
  	FILE *file;
  	int retry = 0, tos, conerrno;
  
  	file_size = size;
  	byte_count = 0;
  	if (size != -1)
  		snprintf(sizebuf, sizeof(sizebuf),
  				" (%jd bytes)", (intmax_t)size);
  	else
  		*sizebuf = '\0';
  	if (pdata >= 0) {
  		union sockunion from;
  		socklen_t fromlen = ctrl_addr.su_len;
  		int flags, s;
  		struct timeval timeout;
  		fd_set set;
  
  		FD_ZERO(&set);
  		FD_SET(pdata, &set);
  
  		timeout.tv_usec = 0;
  		timeout.tv_sec = 120;
  
  		/*
  		 * Granted a socket is in the blocking I/O mode,
  		 * accept() will block after a successful select()
  		 * if the selected connection dies in between.
  		 * Therefore set the non-blocking I/O flag here.
  		 */
  		if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
  		    fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
  			goto pdata_err;
  		if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 ||
  		    (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
  			goto pdata_err;
  		close(pdata);
  		pdata = s;
  		/*
  		 * Unset the inherited non-blocking I/O flag
  		 * on the child socket so stdio can work on it.
  		 */
  		if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
  		    fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
  			goto pdata_err;
  #ifdef IP_TOS
  		if (from.su_family == AF_INET)
  	      {
  		tos = IPTOS_THROUGHPUT;
  		if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
  			syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
  	      }
  #endif
  		reply(150, "Opening %s mode data connection for '%s'%s.",
  		     type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
  		return (fdopen(pdata, mode));
  pdata_err:
  		reply(425, "Can't open data connection.");
  		close(pdata);
  		pdata = -1;
  		return (NULL);
  	}
  	if (data >= 0) {
  		reply(125, "Using existing data connection for '%s'%s.",
  		    name, sizebuf);
  		usedefault = 1;
  		return (fdopen(data, mode));
  	}
  	if (usedefault)
  		data_dest = his_addr;
  	usedefault = 1;
  	do {
  		file = getdatasock(mode);
  		if (file == NULL) {
  			char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV];
  
  			if (getnameinfo((struct sockaddr *)&data_source,
  				data_source.su_len,
  				hostbuf, sizeof(hostbuf) - 1,
  				portbuf, sizeof(portbuf) - 1,
  				NI_NUMERICHOST|NI_NUMERICSERV))
  					*hostbuf = *portbuf = 0;
  			hostbuf[sizeof(hostbuf) - 1] = 0;
  			portbuf[sizeof(portbuf) - 1] = 0;
  			reply(425, "Can't create data socket (%s,%s): %s.",
  				hostbuf, portbuf, strerror(errno));
  			return (NULL);
  		}
  		data = fileno(file);
  		conerrno = 0;
  		if (connect(data, (struct sockaddr *)&data_dest,
  		    data_dest.su_len) == 0)
  			break;
  		conerrno = errno;
  		fclose(file);
  		data = -1;
  		if (conerrno == EADDRINUSE) {
  			sleep(swaitint);
  			retry += swaitint;
  		} else {
  			break;
  		}
  	} while (retry <= swaitmax);
  	if (conerrno != 0) {
  		reply(425, "Can't build data connection: %s.",
  			   strerror(conerrno));
  		return (NULL);
  	}
  	reply(150, "Opening %s mode data connection for '%s'%s.",
  	     type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
  	return (file);
  }
  
  /*
   * A helper macro to avoid code duplication
   * in send_data() and receive_data().
   *
   * XXX We have to block SIGURG during putc() because BSD stdio
   * is unable to restart interrupted write operations and hence
   * the entire buffer contents will be lost as soon as a write()
   * call indicates EINTR to stdio.
   */
  #define FTPD_PUTC(ch, file, label)					\
  	do {								\
  		int ret;						\
  									\
  		do {							\
  			START_UNSAFE;					\
  			ret = putc((ch), (file));			\
  			END_UNSAFE;					\
  			CHECKOOB(return (-1))				\
  			else if (ferror(file))				\
  				goto label;				\
  			clearerr(file);					\
  		} while (ret == EOF);					\
  	} while (0)
  
  /*
   * Tranfer the contents of "instr" to "outstr" peer using the appropriate
   * encapsulation of the data subject to Mode, Structure, and Type.
   *
   * NB: Form isn't handled.
   */
  static int
  send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg)
  {
  	int c, cp, filefd, netfd;
  	char *buf;
  
  	STARTXFER;
  
  	switch (type) {
  
  	case TYPE_A:
  		cp = EOF;
  		for (;;) {
  			c = getc(instr);
  			CHECKOOB(return (-1))
  			else if (c == EOF && ferror(instr))
  				goto file_err;
  			if (c == EOF) {
  				if (ferror(instr)) {	/* resume after OOB */
  					clearerr(instr);
  					continue;
  				}
  				if (feof(instr))	/* EOF */
  					break;
  				syslog(LOG_ERR, "Internal: impossible condition"
  						" on file after getc()");
  				goto file_err;
  			}
  			if (c == '\n' && cp != '\r') {
  				FTPD_PUTC('\r', outstr, data_err);
  				byte_count++;
  			}
  			FTPD_PUTC(c, outstr, data_err);
  			byte_count++;
  			cp = c;
  		}
  #ifdef notyet	/* BSD stdio isn't ready for that */
  		while (fflush(outstr) == EOF) {
  			CHECKOOB(return (-1))
  			else
  				goto data_err;
  			clearerr(outstr);
  		}
  		ENDXFER;
  #else
  		ENDXFER;
  		if (fflush(outstr) == EOF)
  			goto data_err;
  #endif
  		reply(226, "Transfer complete.");
  		return (0);
  
  	case TYPE_I:
  	case TYPE_L:
  		/*
  		 * isreg is only set if we are not doing restart and we
  		 * are sending a regular file
  		 */
  		netfd = fileno(outstr);
  		filefd = fileno(instr);
  
  		if (isreg) {
  			char *msg = "Transfer complete.";
  			off_t cnt, offset;
  			int err;
  
  			cnt = offset = 0;
  
  			while (filesize > 0) {
  				err = sendfile(filefd, netfd, offset, 0,
  					       NULL, &cnt, 0);
  				/*
  				 * Calculate byte_count before OOB processing.
  				 * It can be used in myoob() later.
  				 */
  				byte_count += cnt;
  				offset += cnt;
  				filesize -= cnt;
  				CHECKOOB(return (-1))
  				else if (err == -1) {
  					if (errno != EINTR &&
  					    cnt == 0 && offset == 0)
  						goto oldway;
  					goto data_err;
  				}
  				if (err == -1)	/* resume after OOB */
  					continue;
  				/*
  				 * We hit the EOF prematurely.
  				 * Perhaps the file was externally truncated.
  				 */
  				if (cnt == 0) {
  					msg = "Transfer finished due to "
  					      "premature end of file.";
  					break;
  				}
  			}
  			ENDXFER;
  			reply(226, msg);
  			return (0);
  		}
  
  oldway:
  		if ((buf = malloc(blksize)) == NULL) {
  			ENDXFER;
  			reply(451, "Ran out of memory.");
  			return (-1);
  		}
  
  		for (;;) {
  			int cnt, len;
  			char *bp;
  
  			cnt = read(filefd, buf, blksize);
  			CHECKOOB(free(buf); return (-1))
  			else if (cnt < 0) {
  				free(buf);
  				goto file_err;
  			}
  			if (cnt < 0)	/* resume after OOB */
  				continue;
  			if (cnt == 0)	/* EOF */
  				break;
  			for (len = cnt, bp = buf; len > 0;) {
  				cnt = write(netfd, bp, len);
  				CHECKOOB(free(buf); return (-1))
  				else if (cnt < 0) {
  					free(buf);
  					goto data_err;
  				}
  				if (cnt <= 0)
  					continue;
  				len -= cnt;
  				bp += cnt;
  				byte_count += cnt;
  			}
  		}
  		ENDXFER;
  		free(buf);
  		reply(226, "Transfer complete.");
  		return (0);
  	default:
  		ENDXFER;
  		reply(550, "Unimplemented TYPE %d in send_data.", type);
  		return (-1);
  	}
  
  data_err:
  	ENDXFER;
  	perror_reply(426, "Data connection");
  	return (-1);
  
  file_err:
  	ENDXFER;
  	perror_reply(551, "Error on input file");
  	return (-1);
  }
  
  /*
   * Transfer data from peer to "outstr" using the appropriate encapulation of
   * the data subject to Mode, Structure, and Type.
   *
   * N.B.: Form isn't handled.
   */
  static int
  receive_data(FILE *instr, FILE *outstr)
  {
  	int c, cp;
  	int bare_lfs = 0;
  
  	STARTXFER;
  
  	switch (type) {
  
  	case TYPE_I:
  	case TYPE_L:
  		for (;;) {
  			int cnt, len;
  			char *bp;
  			char buf[BUFSIZ];
  
  			cnt = read(fileno(instr), buf, sizeof(buf));
  			CHECKOOB(return (-1))
  			else if (cnt < 0)
  				goto data_err;
  			if (cnt < 0)	/* resume after OOB */
  				continue;
  			if (cnt == 0)	/* EOF */
  				break;
  			for (len = cnt, bp = buf; len > 0;) {
  				cnt = write(fileno(outstr), bp, len);
  				CHECKOOB(return (-1))
  				else if (cnt < 0)
  					goto file_err;
  				if (cnt <= 0)
  					continue;
  				len -= cnt;
  				bp += cnt;
  				byte_count += cnt;
  			}
  		}
  		ENDXFER;
  		return (0);
  
  	case TYPE_E:
  		ENDXFER;
  		reply(553, "TYPE E not implemented.");
  		return (-1);
  
  	case TYPE_A:
  		cp = EOF;
  		for (;;) {
  			c = getc(instr);
  			CHECKOOB(return (-1))
  			else if (c == EOF && ferror(instr))
  				goto data_err;
  			if (c == EOF && ferror(instr)) { /* resume after OOB */
  				clearerr(instr);
  				continue;
  			}
  
  			if (cp == '\r') {
  				if (c != '\n')
  					FTPD_PUTC('\r', outstr, file_err);
  			} else
  				if (c == '\n')
  					bare_lfs++;
  			if (c == '\r') {
  				byte_count++;
  				cp = c;
  				continue;
  			}
  
  			/* Check for EOF here in order not to lose last \r. */
  			if (c == EOF) {
  				if (feof(instr))	/* EOF */
  					break;
  				syslog(LOG_ERR, "Internal: impossible condition"
  						" on data stream after getc()");
  				goto data_err;
  			}
  
  			byte_count++;
  			FTPD_PUTC(c, outstr, file_err);
  			cp = c;
  		}
  #ifdef notyet	/* BSD stdio isn't ready for that */
  		while (fflush(outstr) == EOF) {
  			CHECKOOB(return (-1))
  			else
  				goto file_err;
  			clearerr(outstr);
  		}
  		ENDXFER;
  #else
  		ENDXFER;
  		if (fflush(outstr) == EOF)
  			goto file_err;
  #endif
  		if (bare_lfs) {
  			lreply(226,
  		"WARNING! %d bare linefeeds received in ASCII mode.",
  			    bare_lfs);
  		printf("   File may not have transferred correctly.\r\n");
  		}
  		return (0);
  	default:
  		ENDXFER;
  		reply(550, "Unimplemented TYPE %d in receive_data.", type);
  		return (-1);
  	}
  
  data_err:
  	ENDXFER;
  	perror_reply(426, "Data connection");
  	return (-1);
  
  file_err:
  	ENDXFER;
  	perror_reply(452, "Error writing to file");
  	return (-1);
  }
  
  void
  statfilecmd(char *filename)
  {
  	FILE *fin;
  	int atstart;
  	int c, code;
  	char line[LINE_MAX];
  	struct stat st;
  
  	code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
  	snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
  	fin = ftpd_popen(line, "r");
  	lreply(code, "Status of %s:", filename);
  	atstart = 1;
  	while ((c = getc(fin)) != EOF) {
  		if (c == '\n') {
  			if (ferror(stdout)){
  				perror_reply(421, "Control connection");
  				ftpd_pclose(fin);
  				dologout(1);
  				/* NOTREACHED */
  			}
  			if (ferror(fin)) {
  				perror_reply(551, filename);
  				ftpd_pclose(fin);
  				return;
  			}
  			putc('\r', stdout);
  		}
  		/*
  		 * RFC 959 says neutral text should be prepended before
  		 * a leading 3-digit number followed by whitespace, but
  		 * many ftp clients can be confused by any leading digits,
  		 * as a matter of fact.
  		 */
  		if (atstart && isdigit(c))
  			putc(' ', stdout);
  		putc(c, stdout);
  		atstart = (c == '\n');
  	}
  	ftpd_pclose(fin);
  	reply(code, "End of status.");
  }
  
  void
  statcmd(void)
  {
  	union sockunion *su;
  	u_char *a, *p;
  	char hname[NI_MAXHOST];
  	int ispassive;
  
  	if (hostinfo) {
  		lreply(211, "%s FTP server status:", hostname);
  		printf("     %s\r\n", version);
  	} else
  		lreply(211, "FTP server status:");
  	printf("     Connected to %s", remotehost);
  	if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
  			 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
  		hname[sizeof(hname) - 1] = 0;
  		if (strcmp(hname, remotehost) != 0)
  			printf(" (%s)", hname);
  	}
  	printf("\r\n");
  	if (logged_in) {
  		if (guest)
  			printf("     Logged in anonymously\r\n");
  		else
  			printf("     Logged in as %s\r\n", pw->pw_name);
  	} else if (askpasswd)
  		printf("     Waiting for password\r\n");
  	else
  		printf("     Waiting for user name\r\n");
  	printf("     TYPE: %s", typenames[type]);
  	if (type == TYPE_A || type == TYPE_E)
  		printf(", FORM: %s", formnames[form]);
  	if (type == TYPE_L)
  #if CHAR_BIT == 8
  		printf(" %d", CHAR_BIT);
  #else
  		printf(" %d", bytesize);	/* need definition! */
  #endif
  	printf("; STRUcture: %s; transfer MODE: %s\r\n",
  	    strunames[stru], modenames[mode]);
  	if (data != -1)
  		printf("     Data connection open\r\n");
  	else if (pdata != -1) {
  		ispassive = 1;
  		su = &pasv_addr;
  		goto printaddr;
  	} else if (usedefault == 0) {
  		ispassive = 0;
  		su = &data_dest;
  printaddr:
  #define UC(b) (((int) b) & 0xff)
  		if (epsvall) {
  			printf("     EPSV only mode (EPSV ALL)\r\n");
  			goto epsvonly;
  		}
  
  		/* PORT/PASV */
  		if (su->su_family == AF_INET) {
  			a = (u_char *) &su->su_sin.sin_addr;
  			p = (u_char *) &su->su_sin.sin_port;
  			printf("     %s (%d,%d,%d,%d,%d,%d)\r\n",
  				ispassive ? "PASV" : "PORT",
  				UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
  				UC(p[0]), UC(p[1]));
  		}
  
  		/* LPRT/LPSV */
  	    {
  		int alen, af, i;
  
  		switch (su->su_family) {
  		case AF_INET:
  			a = (u_char *) &su->su_sin.sin_addr;
  			p = (u_char *) &su->su_sin.sin_port;
  			alen = sizeof(su->su_sin.sin_addr);
  			af = 4;
  			break;
  		case AF_INET6:
  			a = (u_char *) &su->su_sin6.sin6_addr;
  			p = (u_char *) &su->su_sin6.sin6_port;
  			alen = sizeof(su->su_sin6.sin6_addr);
  			af = 6;
  			break;
  		default:
  			af = 0;
  			break;
  		}
  		if (af) {
  			printf("     %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
  				af, alen);
  			for (i = 0; i < alen; i++)
  				printf("%d,", UC(a[i]));
  			printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
  		}
  	    }
  
  epsvonly:;
  		/* EPRT/EPSV */
  	    {
  		int af;
  
  		switch (su->su_family) {
  		case AF_INET:
  			af = 1;
  			break;
  		case AF_INET6:
  			af = 2;
  			break;
  		default:
  			af = 0;
  			break;
  		}
  		if (af) {
  			union sockunion tmp;
  
  			tmp = *su;
  			if (tmp.su_family == AF_INET6)
  				tmp.su_sin6.sin6_scope_id = 0;
  			if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
  					hname, sizeof(hname) - 1, NULL, 0,
  					NI_NUMERICHOST)) {
  				hname[sizeof(hname) - 1] = 0;
  				printf("     %s |%d|%s|%d|\r\n",
  					ispassive ? "EPSV" : "EPRT",
  					af, hname, htons(tmp.su_port));
  			}
  		}
  	    }
  #undef UC
  	} else
  		printf("     No data connection\r\n");
  	reply(211, "End of status.");
  }
  
  void
  fatalerror(char *s)
  {
  
  	reply(451, "Error in server: %s", s);
  	reply(221, "Closing connection due to server error.");
  	dologout(0);
  	/* NOTREACHED */
  }
  
  void
  reply(int n, const char *fmt, ...)
  {
  	va_list ap;
  
  	printf("%d ", n);
  	va_start(ap, fmt);
  	vprintf(fmt, ap);
  	va_end(ap);
  	printf("\r\n");
  	fflush(stdout);
  	if (ftpdebug) {
  		syslog(LOG_DEBUG, "<--- %d ", n);
  		va_start(ap, fmt);
  		vsyslog(LOG_DEBUG, fmt, ap);
  		va_end(ap);
  	}
  }
  
  void
  lreply(int n, const char *fmt, ...)
  {
  	va_list ap;
  
  	printf("%d- ", n);
  	va_start(ap, fmt);
  	vprintf(fmt, ap);
  	va_end(ap);
  	printf("\r\n");
  	fflush(stdout);
  	if (ftpdebug) {
  		syslog(LOG_DEBUG, "<--- %d- ", n);
  		va_start(ap, fmt);
  		vsyslog(LOG_DEBUG, fmt, ap);
  		va_end(ap);
  	}
  }
  
  static void
  ack(char *s)
  {
  
  	reply(250, "%s command successful.", s);
  }
  
  void
  nack(char *s)
  {
  
  	reply(502, "%s command not implemented.", s);
  }
  
  /* ARGSUSED */
  void
  yyerror(char *s)
  {
  	char *cp;
  
  	if ((cp = strchr(cbuf,'\n')))
  		*cp = '\0';
  	reply(500, "%s: command not understood.", cbuf);
  }
  
  void
  delete(char *name)
  {
  	struct stat st;
  
  	LOGCMD("delete", name);
  	if (lstat(name, &st) < 0) {
  		perror_reply(550, name);
  		return;
  	}
  	if (S_ISDIR(st.st_mode)) {
  		if (rmdir(name) < 0) {
  			perror_reply(550, name);
  			return;
  		}
  		goto done;
  	}
  	if (guest && noguestmod) {
  		reply(550, "Operation not permitted.");
  		return;
  	}
  	if (unlink(name) < 0) {
  		perror_reply(550, name);
  		return;
  	}
  done:
  	ack("DELE");
  }
  
  void
  cwd(char *path)
  {
  
  	if (chdir(path) < 0)
  		perror_reply(550, path);
  	else
  		ack("CWD");
  }
  
  void
  makedir(char *name)
  {
  	char *s;
  
  	LOGCMD("mkdir", name);
  	if (guest && noguestmkd)
  		reply(550, "Operation not permitted.");
  	else if (mkdir(name, 0777) < 0)
  		perror_reply(550, name);
  	else {
  		if ((s = doublequote(name)) == NULL)
  			fatalerror("Ran out of memory.");
  		reply(257, "\"%s\" directory created.", s);
  		free(s);
  	}
  }
  
  void
  removedir(char *name)
  {
  
  	LOGCMD("rmdir", name);
  	if (rmdir(name) < 0)
  		perror_reply(550, name);
  	else
  		ack("RMD");
  }
  
  void
  pwd(void)
  {
  	char *s, path[MAXPATHLEN + 1];
  
  	if (getcwd(path, sizeof(path)) == NULL)
  		perror_reply(550, "Get current directory");
  	else {
  		if ((s = doublequote(path)) == NULL)
  			fatalerror("Ran out of memory.");
  		reply(257, "\"%s\" is current directory.", s);
  		free(s);
  	}
  }
  
  char *
  renamefrom(char *name)
  {
  	struct stat st;
  
  	if (guest && noguestmod) {
  		reply(550, "Operation not permitted.");
  		return (NULL);
  	}
  	if (lstat(name, &st) < 0) {
  		perror_reply(550, name);
  		return (NULL);
  	}
  	reply(350, "File exists, ready for destination name.");
  	return (name);
  }
  
  void
  renamecmd(char *from, char *to)
  {
  	struct stat st;
  
  	LOGCMD2("rename", from, to);
  
  	if (guest && (stat(to, &st) == 0)) {
  		reply(550, "%s: permission denied.", to);
  		return;
  	}
  
  	if (rename(from, to) < 0)
  		perror_reply(550, "rename");
  	else
  		ack("RNTO");
  }
  
  static void
  dolog(struct sockaddr *who)
  {
  	char who_name[NI_MAXHOST];
  
  	realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
  	remotehost[sizeof(remotehost) - 1] = 0;
  	if (getnameinfo(who, who->sa_len,
  		who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST))
  			*who_name = 0;
  	who_name[sizeof(who_name) - 1] = 0;
  
  #ifdef SETPROCTITLE
  #ifdef VIRTUAL_HOSTING
  	if (thishost != firsthost)
  		snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
  			 remotehost, hostname);
  	else
  #endif
  		snprintf(proctitle, sizeof(proctitle), "%s: connected",
  			 remotehost);
  	setproctitle("%s", proctitle);
  #endif /* SETPROCTITLE */
  
  	if (logging) {
  #ifdef VIRTUAL_HOSTING
  		if (thishost != firsthost)
  			syslog(LOG_INFO, "connection from %s (%s) to %s",
  			       remotehost, who_name, hostname);
  		else
  #endif
  			syslog(LOG_INFO, "connection from %s (%s)",
  			       remotehost, who_name);
  	}
  }
  
  /*
   * Record logout in wtmp file
   * and exit with supplied status.
   */
  void
  dologout(int status)
  {
  
  	if (logged_in && dowtmp) {
  		seteuid(0);
  		ftpd_logwtmp(ttyline, "", NULL);
  	}
  	/* beware of flushing buffers after a SIGPIPE */
  	_exit(status);
  }
  
  static void
  sigurg(int signo)
  {
  
  	recvurg = 1;
  }
  
  static void
  maskurg(int flag)
  {
  	int oerrno;
  	sigset_t sset;
  
  	if (!transflag) {
  		syslog(LOG_ERR, "Internal: maskurg() while no transfer");
  		return;
  	}
  	oerrno = errno;
  	sigemptyset(&sset);
  	sigaddset(&sset, SIGURG);
  	sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL);
  	errno = oerrno;
  }
  
  static void
  flagxfer(int flag)
  {
  
  	if (flag) {
  		if (transflag)
  			syslog(LOG_ERR, "Internal: flagxfer(1): "
  					"transfer already under way");
  		transflag = 1;
  		maskurg(0);
  		recvurg = 0;
  	} else {
  		if (!transflag)
  			syslog(LOG_ERR, "Internal: flagxfer(0): "
  					"no active transfer");
  		maskurg(1);
  		transflag = 0;
  	}
  }
  
  /*
   * Returns 0 if OK to resume or -1 if abort requested.
   */
  static int
  myoob(void)
  {
  	char *cp;
  	int ret;
  
  	if (!transflag) {
  		syslog(LOG_ERR, "Internal: myoob() while no transfer");
  		return (0);
  	}
  	cp = tmpline;
  	ret = getline(cp, 7, stdin);
  	if (ret == -1) {
  		reply(221, "You could at least say goodbye.");
  		dologout(0);
  	} else if (ret == -2) {
  		/* Ignore truncated command. */
  		return (0);
  	}
  	upper(cp);
  	if (strcmp(cp, "ABOR\r\n") == 0) {
  		tmpline[0] = '\0';
  		reply(426, "Transfer aborted. Data connection closed.");
  		reply(226, "Abort successful.");
  		return (-1);
  	}
  	if (strcmp(cp, "STAT\r\n") == 0) {
  		tmpline[0] = '\0';
  		if (file_size != -1)
  			reply(213, "Status: %jd of %jd bytes transferred.",
  				   (intmax_t)byte_count, (intmax_t)file_size);
  		else
  			reply(213, "Status: %jd bytes transferred.",
  				   (intmax_t)byte_count);
  	}
  	return (0);
  }
  
  /*
   * Note: a response of 425 is not mentioned as a possible response to
   *	the PASV command in RFC959. However, it has been blessed as
   *	a legitimate response by Jon Postel in a telephone conversation
   *	with Rick Adams on 25 Jan 89.
   */
  void
  passive(void)
  {
  	socklen_t len;
  	int on;
  	char *p, *a;
  
  	if (pdata >= 0)		/* close old port if one set */
  		close(pdata);
  
  	pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
  	if (pdata < 0) {
  		perror_reply(425, "Can't open passive connection");
  		return;
  	}
  	on = 1;
  	if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
  		syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
  
  	seteuid(0);
  
  #ifdef IP_PORTRANGE
  	if (ctrl_addr.su_family == AF_INET) {
  	    on = restricted_data_ports ? IP_PORTRANGE_HIGH
  				       : IP_PORTRANGE_DEFAULT;
  
  	    if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
  			    &on, sizeof(on)) < 0)
  		    goto pasv_error;
  	}
  #endif
  #ifdef IPV6_PORTRANGE
  	if (ctrl_addr.su_family == AF_INET6) {
  	    on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
  				       : IPV6_PORTRANGE_DEFAULT;
  
  	    if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
  			    &on, sizeof(on)) < 0)
  		    goto pasv_error;
  	}
  #endif
  
  	pasv_addr = ctrl_addr;
  	pasv_addr.su_port = 0;
  	if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
  		goto pasv_error;
  
  	seteuid(pw->pw_uid);
  
  	len = sizeof(pasv_addr);
  	if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
  		goto pasv_error;
  	if (listen(pdata, 1) < 0)
  		goto pasv_error;
  	if (pasv_addr.su_family == AF_INET)
  		a = (char *) &pasv_addr.su_sin.sin_addr;
  	else if (pasv_addr.su_family == AF_INET6 &&
  		 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
  		a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
  	else
  		goto pasv_error;
  		
  	p = (char *) &pasv_addr.su_port;
  
  #define UC(b) (((int) b) & 0xff)
  
  	reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
  		UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
  	return;
  
  pasv_error:
  	seteuid(pw->pw_uid);
  	close(pdata);
  	pdata = -1;
  	perror_reply(425, "Can't open passive connection");
  	return;
  }
  
  /*
   * Long Passive defined in RFC 1639.
   *     228 Entering Long Passive Mode
   *         (af, hal, h1, h2, h3,..., pal, p1, p2...)
   */
  
  void
  long_passive(char *cmd, int pf)
  {
  	socklen_t len;
  	int on;
  	char *p, *a;
  
  	if (pdata >= 0)		/* close old port if one set */
  		close(pdata);
  
  	if (pf != PF_UNSPEC) {
  		if (ctrl_addr.su_family != pf) {
  			switch (ctrl_addr.su_family) {
  			case AF_INET:
  				pf = 1;
  				break;
  			case AF_INET6:
  				pf = 2;
  				break;
  			default:
  				pf = 0;
  				break;
  			}
  			/*
  			 * XXX
  			 * only EPRT/EPSV ready clients will understand this
  			 */
  			if (strcmp(cmd, "EPSV") == 0 && pf) {
  				reply(522, "Network protocol mismatch, "
  					"use (%d)", pf);
  			} else
  				reply(501, "Network protocol mismatch."); /*XXX*/
  
  			return;
  		}
  	}
  		
  	pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
  	if (pdata < 0) {
  		perror_reply(425, "Can't open passive connection");
  		return;
  	}
  	on = 1;
  	if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
  		syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
  
  	seteuid(0);
  
  	pasv_addr = ctrl_addr;
  	pasv_addr.su_port = 0;
  	len = pasv_addr.su_len;
  
  #ifdef IP_PORTRANGE
  	if (ctrl_addr.su_family == AF_INET) {
  	    on = restricted_data_ports ? IP_PORTRANGE_HIGH
  				       : IP_PORTRANGE_DEFAULT;
  
  	    if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
  			    &on, sizeof(on)) < 0)
  		    goto pasv_error;
  	}
  #endif
  #ifdef IPV6_PORTRANGE
  	if (ctrl_addr.su_family == AF_INET6) {
  	    on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
  				       : IPV6_PORTRANGE_DEFAULT;
  
  	    if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
  			    &on, sizeof(on)) < 0)
  		    goto pasv_error;
  	}
  #endif
  
  	if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
  		goto pasv_error;
  
  	seteuid(pw->pw_uid);
  
  	if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
  		goto pasv_error;
  	if (listen(pdata, 1) < 0)
  		goto pasv_error;
  
  #define UC(b) (((int) b) & 0xff)
  
  	if (strcmp(cmd, "LPSV") == 0) {
  		p = (char *)&pasv_addr.su_port;
  		switch (pasv_addr.su_family) {
  		case AF_INET:
  			a = (char *) &pasv_addr.su_sin.sin_addr;
  		v4_reply:
  			reply(228,
  "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
  			      4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
  			      2, UC(p[0]), UC(p[1]));
  			return;
  		case AF_INET6:
  			if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
  				a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
  				goto v4_reply;
  			}
  			a = (char *) &pasv_addr.su_sin6.sin6_addr;
  			reply(228,
  "Entering Long Passive Mode "
  "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
  			      6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
  			      UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
  			      UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
  			      UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
  			      2, UC(p[0]), UC(p[1]));
  			return;
  		}
  	} else if (strcmp(cmd, "EPSV") == 0) {
  		switch (pasv_addr.su_family) {
  		case AF_INET:
  		case AF_INET6:
  			reply(229, "Entering Extended Passive Mode (|||%d|)",
  				ntohs(pasv_addr.su_port));
  			return;
  		}
  	} else {
  		/* more proper error code? */
  	}
  
  pasv_error:
  	seteuid(pw->pw_uid);
  	close(pdata);
  	pdata = -1;
  	perror_reply(425, "Can't open passive connection");
  	return;
  }
  
  /*
   * Generate unique name for file with basename "local"
   * and open the file in order to avoid possible races.
   * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
   * Return descriptor to the file, set "name" to its name.
   *
   * Generates failure reply on error.
   */
  static int
  guniquefd(char *local, char **name)
  {
  	static char new[MAXPATHLEN];
  	struct stat st;
  	char *cp;
  	int count;
  	int fd;
  
  	cp = strrchr(local, '/');
  	if (cp)
  		*cp = '\0';
  	if (stat(cp ? local : ".", &st) < 0) {
  		perror_reply(553, cp ? local : ".");
  		return (-1);
  	}
  	if (cp) {
  		/*
  		 * Let not overwrite dirname with counter suffix.
  		 * -4 is for /nn\0
  		 * In this extreme case dot won't be put in front of suffix.
  		 */
  		if (strlen(local) > sizeof(new) - 4) {
  			reply(553, "Pathname too long.");
  			return (-1);
  		}
  		*cp = '/';
  	}
  	/* -4 is for the .nn<null> we put on the end below */
  	snprintf(new, sizeof(new) - 4, "%s", local);
  	cp = new + strlen(new);
  	/* 
  	 * Don't generate dotfile unless requested explicitly.
  	 * This covers the case when basename gets truncated off
  	 * by buffer size.
  	 */
  	if (cp > new && cp[-1] != '/')
  		*cp++ = '.';
  	for (count = 0; count < 100; count++) {
  		/* At count 0 try unmodified name */
  		if (count)
  			sprintf(cp, "%d", count);
  		if ((fd = open(count ? new : local,
  		    O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
  			*name = count ? new : local;
  			return (fd);
  		}
  		if (errno != EEXIST) {
  			perror_reply(553, count ? new : local);
  			return (-1);
  		}
  	}
  	reply(452, "Unique file name cannot be created.");
  	return (-1);
  }
  
  /*
   * Format and send reply containing system error number.
   */
  void
  perror_reply(int code, char *string)
  {
  
  	reply(code, "%s: %s.", string, strerror(errno));
  }
  
  static char *onefile[] = {
  	"",
  	0
  };
  
  void
  send_file_list(char *whichf)
  {
  	struct stat st;
  	DIR *dirp = NULL;
  	struct dirent *dir;
  	FILE *dout = NULL;
  	char **dirlist, *dirname;
  	int simple = 0;
  	int freeglob = 0;
  	glob_t gl;
  
  	if (strpbrk(whichf, "~{[*?") != NULL) {
  		int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
  
  		memset(&gl, 0, sizeof(gl));
  		gl.gl_matchc = MAXGLOBARGS;
  		/*flags |= GLOB_LIMIT;*/
  		freeglob = 1;
  		if (glob(whichf, flags, 0, &gl)) {
  			reply(550, "No matching files found.");
  			goto out;
  		} else if (gl.gl_pathc == 0) {
  			errno = ENOENT;
  			perror_reply(550, whichf);
  			goto out;
  		}
  		dirlist = gl.gl_pathv;
  	} else {
  		onefile[0] = whichf;
  		dirlist = onefile;
  		simple = 1;
  	}
  
  	while ((dirname = *dirlist++)) {
  		if (stat(dirname, &st) < 0) {
  			/*
  			 * If user typed "ls -l", etc, and the client
  			 * used NLST, do what the user meant.
  			 */
  			if (dirname[0] == '-' && *dirlist == NULL &&
  			    dout == NULL)
  				retrieve(_PATH_LS " %s", dirname);
  			else
  				perror_reply(550, whichf);
  			goto out;
  		}
  
  		if (S_ISREG(st.st_mode)) {
  			if (dout == NULL) {
  				dout = dataconn("file list", -1, "w");
  				if (dout == NULL)
  					goto out;
  				STARTXFER;
  			}
  			START_UNSAFE;
  			fprintf(dout, "%s%s\n", dirname,
  				type == TYPE_A ? "\r" : "");
  			END_UNSAFE;
  			if (ferror(dout))
  				goto data_err;
  			byte_count += strlen(dirname) +
  				      (type == TYPE_A ? 2 : 1);
  			CHECKOOB(goto abrt);
  			continue;
  		} else if (!S_ISDIR(st.st_mode))
  			continue;
  
  		if ((dirp = opendir(dirname)) == NULL)
  			continue;
  
  		while ((dir = readdir(dirp)) != NULL) {
  			char nbuf[MAXPATHLEN];
  
  			CHECKOOB(goto abrt);
  
  			if (strcmp(dir->d_name, ".") == 0)
  				continue;
  			if (strcmp(dir->d_name, "..") == 0)
  				continue;
  
  			snprintf(nbuf, sizeof(nbuf),
  				"%s/%s", dirname, dir->d_name);
  
  			/*
  			 * We have to do a stat to insure it's
  			 * not a directory or special file.
  			 */
  			if (simple || (stat(nbuf, &st) == 0 &&
  			    S_ISREG(st.st_mode))) {
  				if (dout == NULL) {
  					dout = dataconn("file list", -1, "w");
  					if (dout == NULL)
  						goto out;
  					STARTXFER;
  				}
  				START_UNSAFE;
  				if (nbuf[0] == '.' && nbuf[1] == '/')
  					fprintf(dout, "%s%s\n", &nbuf[2],
  						type == TYPE_A ? "\r" : "");
  				else
  					fprintf(dout, "%s%s\n", nbuf,
  						type == TYPE_A ? "\r" : "");
  				END_UNSAFE;
  				if (ferror(dout))
  					goto data_err;
  				byte_count += strlen(nbuf) +
  					      (type == TYPE_A ? 2 : 1);
  				CHECKOOB(goto abrt);
  			}
  		}
  		closedir(dirp);
  		dirp = NULL;
  	}
  
  	if (dout == NULL)
  		reply(550, "No files found.");
  	else if (ferror(dout))
  data_err:	perror_reply(550, "Data connection");
  	else
  		reply(226, "Transfer complete.");
  out:
  	if (dout) {
  		ENDXFER;
  abrt:
  		fclose(dout);
  		data = -1;
  		pdata = -1;
  	}
  	if (dirp)
  		closedir(dirp);
  	if (freeglob) {
  		freeglob = 0;
  		globfree(&gl);
  	}
  }
  
  void
  reapchild(int signo)
  {
  	while (waitpid(-1, NULL, WNOHANG) > 0);
  }
  
  static void
  appendf(char **strp, char *fmt, ...)
  {
  	va_list ap;
  	char *ostr, *p;
  
  	va_start(ap, fmt);
  	vasprintf(&p, fmt, ap);
  	va_end(ap);
  	if (p == NULL)
  		fatalerror("Ran out of memory.");
  	if (*strp == NULL)
  		*strp = p;
  	else {
  		ostr = *strp;
  		asprintf(strp, "%s%s", ostr, p);
  		if (*strp == NULL)
  			fatalerror("Ran out of memory.");
  		free(ostr);
  	}
  }
  
  static void
  logcmd(char *cmd, char *file1, char *file2, off_t cnt)
  {
  	char *msg = NULL;
  	char wd[MAXPATHLEN + 1];
  
  	if (logging <= 1)
  		return;
  
  	if (getcwd(wd, sizeof(wd) - 1) == NULL)
  		strcpy(wd, strerror(errno));
  
  	appendf(&msg, "%s", cmd);
  	if (file1)
  		appendf(&msg, " %s", file1);
  	if (file2)
  		appendf(&msg, " %s", file2);
  	if (cnt >= 0)
  		appendf(&msg, " = %jd bytes", (intmax_t)cnt);
  	appendf(&msg, " (wd: %s", wd);
  	if (guest || dochroot)
  		appendf(&msg, "; chrooted");
  	appendf(&msg, ")");
  	syslog(LOG_INFO, "%s", msg);
  	free(msg);
  }
  
  static void
  logxfer(char *name, off_t size, time_t start)
  {
  	char buf[MAXPATHLEN + 1024];
  	char path[MAXPATHLEN + 1];
  	time_t now;
  
  	if (statfd >= 0) {
  		time(&now);
  		if (realpath(name, path) == NULL) {
  			syslog(LOG_NOTICE, "realpath failed on %s: %m", path);
  			return;
  		}
  		snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n",
  			ctime(&now)+4, ident, remotehost,
  			path, (intmax_t)size,
  			(long)(now - start + (now == start)));
  		write(statfd, buf, strlen(buf));
  	}
  }
  
  static char *
  doublequote(char *s)
  {
  	int n;
  	char *p, *s2;
  
  	for (p = s, n = 0; *p; p++)
  		if (*p == '"')
  			n++;
  
  	if ((s2 = malloc(p - s + n + 1)) == NULL)
  		return (NULL);
  
  	for (p = s2; *s; s++, p++) {
  		if ((*p = *s) == '"')
  			*(++p) = '"';
  	}
  	*p = '\0';
  
  	return (s2);
  }
  
  /* setup server socket for specified address family */
  /* if af is PF_UNSPEC more than one socket may be returned */
  /* the returned list is dynamically allocated, so caller needs to free it */
  static int *
  socksetup(int af, char *bindname, const char *bindport)
  {
  	struct addrinfo hints, *res, *r;
  	int error, maxs, *s, *socks;
  	const int on = 1;
  
  	memset(&hints, 0, sizeof(hints));
  	hints.ai_flags = AI_PASSIVE;
  	hints.ai_family = af;
  	hints.ai_socktype = SOCK_STREAM;
  	error = getaddrinfo(bindname, bindport, &hints, &res);
  	if (error) {
  		syslog(LOG_ERR, "%s", gai_strerror(error));
  		if (error == EAI_SYSTEM)
  			syslog(LOG_ERR, "%s", strerror(errno));
  		return NULL;
  	}
  
  	/* Count max number of sockets we may open */
  	for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
  		;
  	socks = malloc((maxs + 1) * sizeof(int));
  	if (!socks) {
  		freeaddrinfo(res);
  		syslog(LOG_ERR, "couldn't allocate memory for sockets");
  		return NULL;
  	}
  
  	*socks = 0;   /* num of sockets counter at start of array */
  	s = socks + 1;
  	for (r = res; r; r = r->ai_next) {
  		*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
  		if (*s < 0) {
  			syslog(LOG_DEBUG, "control socket: %m");
  			continue;
  		}
  		if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
  		    &on, sizeof(on)) < 0)
  			syslog(LOG_WARNING,
  			    "control setsockopt (SO_REUSEADDR): %m");
  		if (r->ai_family == AF_INET6) {
  			if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
  			    &on, sizeof(on)) < 0)
  				syslog(LOG_WARNING,
  				    "control setsockopt (IPV6_V6ONLY): %m");
  		}
  		if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
  			syslog(LOG_DEBUG, "control bind: %m");
  			close(*s);
  			continue;
  		}
  		(*socks)++;
  		s++;
  	}
  
  	if (res)
  		freeaddrinfo(res);
  
  	if (*socks == 0) {
  		syslog(LOG_ERR, "control socket: Couldn't bind to any socket");
  		free(socks);
  		return NULL;
  	}
  	return(socks);
  }
  