ftpd.c revision 1.2 
1/*	$OpenBSD: ftpd.c,v 1.2 1996/06/18 10:09:20 downsj Exp $	*/
2/*	$NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $	*/
3
4/*
5 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static char copyright[] =
39"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)ftpd.c	8.4 (Berkeley) 4/16/94";
46#else
47static char rcsid[] = "$NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $";
48#endif
49#endif /* not lint */
50
51/*
52 * FTP server.
53 */
54#include <sys/param.h>
55#include <sys/stat.h>
56#include <sys/ioctl.h>
57#include <sys/socket.h>
58#include <sys/wait.h>
59
60#include <netinet/in.h>
61#include <netinet/in_systm.h>
62#include <netinet/ip.h>
63
64#define	FTP_NAMES
65#include <arpa/ftp.h>
66#include <arpa/inet.h>
67#include <arpa/telnet.h>
68
69#include <ctype.h>
70#include <dirent.h>
71#include <err.h>
72#include <errno.h>
73#include <fcntl.h>
74#include <glob.h>
75#include <limits.h>
76#include <netdb.h>
77#include <pwd.h>
78#include <setjmp.h>
79#include <signal.h>
80#include <stdio.h>
81#include <stdlib.h>
82#include <string.h>
83#include <syslog.h>
84#include <time.h>
85#include <unistd.h>
86#include <utmp.h>
87
88#include "pathnames.h"
89#include "extern.h"
90
91#if __STDC__
92#include <stdarg.h>
93#else
94#include <varargs.h>
95#endif
96
97static char version[] = "Version 6.00";
98
99extern	off_t restart_point;
100extern	char cbuf[];
101
102struct	sockaddr_in ctrl_addr;
103struct	sockaddr_in data_source;
104struct	sockaddr_in data_dest;
105struct	sockaddr_in his_addr;
106struct	sockaddr_in pasv_addr;
107
108int	data;
109jmp_buf	errcatch, urgcatch;
110int	logged_in;
111struct	passwd *pw;
112int	debug;
113int	timeout = 900;    /* timeout after 15 minutes of inactivity */
114int	maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
115int	logging;
116int	guest;
117int	dochroot;
118int	type;
119int	form;
120int	stru;			/* avoid C keyword */
121int	mode;
122int	doutmp = 0;		/* update utmp file */
123int	usedefault = 1;		/* for data transfers */
124int	pdata = -1;		/* for passive mode */
125sig_atomic_t transflag;
126off_t	file_size;
127off_t	byte_count;
128#if !defined(CMASK) || CMASK == 0
129#undef CMASK
130#define CMASK 027
131#endif
132int	defumask = CMASK;		/* default umask value */
133char	tmpline[7];
134char	hostname[MAXHOSTNAMELEN];
135char	remotehost[MAXHOSTNAMELEN];
136static char ttyline[20];
137char	*tty = ttyline;		/* for klogin */
138static struct utmp utmp;	/* for utmp */
139
140#if defined(KERBEROS)
141int	notickets = 1;
142char	*krbtkfile_env = NULL;
143#endif
144
145/*
146 * Timeout intervals for retrying connections
147 * to hosts that don't accept PORT cmds.  This
148 * is a kludge, but given the problems with TCP...
149 */
150#define	SWAITMAX	90	/* wait at most 90 seconds */
151#define	SWAITINT	5	/* interval between retries */
152
153int	swaitmax = SWAITMAX;
154int	swaitint = SWAITINT;
155
156#ifdef HASSETPROCTITLE
157char	proctitle[BUFSIZ];	/* initial part of title */
158#endif /* HASSETPROCTITLE */
159
160#define LOGCMD(cmd, file) \
161	if (logging > 1) \
162	    syslog(LOG_INFO,"%s %s%s", cmd, \
163		*(file) == '/' ? "" : curdir(), file);
164#define LOGCMD2(cmd, file1, file2) \
165	 if (logging > 1) \
166	    syslog(LOG_INFO,"%s %s%s %s%s", cmd, \
167		*(file1) == '/' ? "" : curdir(), file1, \
168		*(file2) == '/' ? "" : curdir(), file2);
169#define LOGBYTES(cmd, file, cnt) \
170	if (logging > 1) { \
171		if (cnt == (off_t)-1) \
172		    syslog(LOG_INFO,"%s %s%s", cmd, \
173			*(file) == '/' ? "" : curdir(), file); \
174		else \
175		    syslog(LOG_INFO, "%s %s%s = %qd bytes", \
176			cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \
177	}
178
179static void	 ack __P((char *));
180static void	 myoob __P((int));
181static int	 checkuser __P((char *, char *));
182static FILE	*dataconn __P((char *, off_t, char *));
183static void	 dolog __P((struct sockaddr_in *));
184static char	*curdir __P((void));
185static void	 end_login __P((void));
186static FILE	*getdatasock __P((char *));
187static char	*gunique __P((char *));
188static void	 lostconn __P((int));
189static int	 receive_data __P((FILE *, FILE *));
190static void	 send_data __P((FILE *, FILE *, off_t));
191static struct passwd *
192		 sgetpwnam __P((char *));
193static char	*sgetsave __P((char *));
194
195static char *
196curdir()
197{
198	static char path[MAXPATHLEN+1+1];	/* path + '/' + '\0' */
199
200	if (getcwd(path, sizeof(path)-2) == NULL)
201		return ("");
202	if (path[1] != '\0')		/* special case for root dir. */
203		strcat(path, "/");
204	/* For guest account, skip / since it's chrooted */
205	return (guest ? path+1 : path);
206}
207
208int
209main(argc, argv, envp)
210	int argc;
211	char *argv[];
212	char **envp;
213{
214	int addrlen, ch, on = 1, tos;
215	char *cp, line[LINE_MAX];
216	FILE *fd;
217
218	/*
219	 * LOG_NDELAY sets up the logging connection immediately,
220	 * necessary for anonymous ftp's that chroot and can't do it later.
221	 */
222	openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
223	addrlen = sizeof(his_addr);
224	if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
225		syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
226		exit(1);
227	}
228	addrlen = sizeof(ctrl_addr);
229	if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
230		syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
231		exit(1);
232	}
233#ifdef IP_TOS
234	tos = IPTOS_LOWDELAY;
235	if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
236		syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
237#endif
238	data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1);
239	debug = 0;
240
241	/* set this here so klogin can use it... */
242	(void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
243
244	while ((ch = getopt(argc, argv, "dlt:T:u:Uv")) != EOF) {
245		switch (ch) {
246		case 'd':
247			debug = 1;
248			break;
249
250		case 'l':
251			logging++;	/* > 1 == extra logging */
252			break;
253
254		case 't':
255			timeout = atoi(optarg);
256			if (maxtimeout < timeout)
257				maxtimeout = timeout;
258			break;
259
260		case 'T':
261			maxtimeout = atoi(optarg);
262			if (timeout > maxtimeout)
263				timeout = maxtimeout;
264			break;
265
266		case 'u':
267		    {
268			long val = 0;
269
270			val = strtol(optarg, &optarg, 8);
271			if (*optarg != '\0' || val < 0)
272				warnx("bad value for -u");
273			else
274				defumask = val;
275			break;
276		    }
277
278		case 'U':
279			doutmp = 1;
280			break;
281
282		case 'v':
283			debug = 1;
284			break;
285
286		default:
287			warnx("unknown flag -%c ignored", optopt);
288			break;
289		}
290	}
291	(void) freopen(_PATH_DEVNULL, "w", stderr);
292	(void) signal(SIGPIPE, lostconn);
293	(void) signal(SIGCHLD, SIG_IGN);
294	if ((long)signal(SIGURG, myoob) < 0)
295		syslog(LOG_ERR, "signal: %m");
296
297	/* Try to handle urgent data inline */
298#ifdef SO_OOBINLINE
299	if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0)
300		syslog(LOG_ERR, "setsockopt: %m");
301#endif
302
303#ifdef	F_SETOWN
304	if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
305		syslog(LOG_ERR, "fcntl F_SETOWN: %m");
306#endif
307	dolog(&his_addr);
308	/*
309	 * Set up default state
310	 */
311	data = -1;
312	type = TYPE_A;
313	form = FORM_N;
314	stru = STRU_F;
315	mode = MODE_S;
316	tmpline[0] = '\0';
317
318	/* If logins are disabled, print out the message. */
319	if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
320		while (fgets(line, sizeof(line), fd) != NULL) {
321			if ((cp = strchr(line, '\n')) != NULL)
322				*cp = '\0';
323			lreply(530, "%s", line);
324		}
325		(void) fflush(stdout);
326		(void) fclose(fd);
327		reply(530, "System not available.");
328		exit(0);
329	}
330	if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
331		while (fgets(line, sizeof(line), fd) != NULL) {
332			if ((cp = strchr(line, '\n')) != NULL)
333				*cp = '\0';
334			lreply(220, "%s", line);
335		}
336		(void) fflush(stdout);
337		(void) fclose(fd);
338		/* reply(220,) must follow */
339	}
340	(void) gethostname(hostname, sizeof(hostname));
341	reply(220, "%s FTP server (%s) ready.", hostname, version);
342	(void) setjmp(errcatch);
343	for (;;)
344		(void) yyparse();
345	/* NOTREACHED */
346}
347
348static void
349lostconn(signo)
350	int signo;
351{
352
353	if (debug)
354		syslog(LOG_DEBUG, "lost connection");
355	dologout(-1);
356}
357
358/*
359 * Helper function for sgetpwnam().
360 */
361static char *
362sgetsave(s)
363	char *s;
364{
365	char *new = malloc((unsigned) strlen(s) + 1);
366
367	if (new == NULL) {
368		perror_reply(421, "Local resource failure: malloc");
369		dologout(1);
370		/* NOTREACHED */
371	}
372	(void) strcpy(new, s);
373	return (new);
374}
375
376/*
377 * Save the result of a getpwnam.  Used for USER command, since
378 * the data returned must not be clobbered by any other command
379 * (e.g., globbing).
380 */
381static struct passwd *
382sgetpwnam(name)
383	char *name;
384{
385	static struct passwd save;
386	struct passwd *p;
387
388	if ((p = getpwnam(name)) == NULL)
389		return (p);
390	if (save.pw_name) {
391		free(save.pw_name);
392		free(save.pw_passwd);
393		free(save.pw_gecos);
394		free(save.pw_dir);
395		free(save.pw_shell);
396	}
397	save = *p;
398	save.pw_name = sgetsave(p->pw_name);
399	save.pw_passwd = sgetsave(p->pw_passwd);
400	save.pw_gecos = sgetsave(p->pw_gecos);
401	save.pw_dir = sgetsave(p->pw_dir);
402	save.pw_shell = sgetsave(p->pw_shell);
403	return (&save);
404}
405
406static int login_attempts;	/* number of failed login attempts */
407static int askpasswd;		/* had user command, ask for passwd */
408static char curname[10];	/* current USER name */
409
410/*
411 * USER command.
412 * Sets global passwd pointer pw if named account exists and is acceptable;
413 * sets askpasswd if a PASS command is expected.  If logged in previously,
414 * need to reset state.  If name is "ftp" or "anonymous", the name is not in
415 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
416 * If account doesn't exist, ask for passwd anyway.  Otherwise, check user
417 * requesting login privileges.  Disallow anyone who does not have a standard
418 * shell as returned by getusershell().  Disallow anyone mentioned in the file
419 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
420 */
421void
422user(name)
423	char *name;
424{
425	char *cp, *shell;
426
427	if (logged_in) {
428		if (guest) {
429			reply(530, "Can't change user from guest login.");
430			return;
431		} else if (dochroot) {
432			reply(530, "Can't change user from chroot user.");
433			return;
434		}
435		end_login();
436	}
437
438	guest = 0;
439	if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
440		if (checkuser(_PATH_FTPUSERS, "ftp") ||
441		    checkuser(_PATH_FTPUSERS, "anonymous"))
442			reply(530, "User %s access denied.", name);
443		else if ((pw = sgetpwnam("ftp")) != NULL) {
444			guest = 1;
445			askpasswd = 1;
446			reply(331,
447			    "Guest login ok, type your name as password.");
448		} else
449			reply(530, "User %s unknown.", name);
450		if (!askpasswd && logging)
451			syslog(LOG_NOTICE,
452			    "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
453		return;
454	}
455	if (pw = sgetpwnam(name)) {
456		if ((shell = pw->pw_shell) == NULL || *shell == 0)
457			shell = _PATH_BSHELL;
458		while ((cp = getusershell()) != NULL)
459			if (strcmp(cp, shell) == 0)
460				break;
461		endusershell();
462
463		if (cp == NULL || checkuser(_PATH_FTPUSERS, name)) {
464			reply(530, "User %s access denied.", name);
465			if (logging)
466				syslog(LOG_NOTICE,
467				    "FTP LOGIN REFUSED FROM %s, %s",
468				    remotehost, name);
469			pw = (struct passwd *) NULL;
470			return;
471		}
472	}
473	if (logging)
474		strncpy(curname, name, sizeof(curname)-1);
475#ifdef SKEY
476	if (!skey_haskey(name)) {
477		char *myskey, *skey_keyinfo __P((char *name));
478
479		myskey = skey_keyinfo(name);
480		reply(331, "Password [%s] for %s required.",
481		    myskey ? myskey : "error getting challenge", name);
482	} else
483#endif
484		reply(331, "Password required for %s.", name);
485
486	askpasswd = 1;
487	/*
488	 * Delay before reading passwd after first failed
489	 * attempt to slow down passwd-guessing programs.
490	 */
491	if (login_attempts)
492		sleep((unsigned) login_attempts);
493}
494
495/*
496 * Check if a user is in the file "fname"
497 */
498static int
499checkuser(fname, name)
500	char *fname;
501	char *name;
502{
503	FILE *fd;
504	int found = 0;
505	char *p, line[BUFSIZ];
506
507	if ((fd = fopen(fname, "r")) != NULL) {
508		while (fgets(line, sizeof(line), fd) != NULL)
509			if ((p = strchr(line, '\n')) != NULL) {
510				*p = '\0';
511				if (line[0] == '#')
512					continue;
513				if (strcmp(line, name) == 0) {
514					found = 1;
515					break;
516				}
517			}
518		(void) fclose(fd);
519	}
520	return (found);
521}
522
523/*
524 * Terminate login as previous user, if any, resetting state;
525 * used when USER command is given or login fails.
526 */
527static void
528end_login()
529{
530
531	(void) seteuid((uid_t)0);
532	if (logged_in) {
533		logwtmp(ttyline, "", "");
534		if (doutmp)
535			logout(utmp.ut_line);
536	}
537	pw = NULL;
538	logged_in = 0;
539	guest = 0;
540	dochroot = 0;
541}
542
543void
544pass(passwd)
545	char *passwd;
546{
547	int rval;
548	FILE *fd;
549
550	if (logged_in || askpasswd == 0) {
551		reply(503, "Login with USER first.");
552		return;
553	}
554	askpasswd = 0;
555	if (!guest) {		/* "ftp" is only account allowed no password */
556		if (pw == NULL) {
557			rval = 1;	/* failure below */
558			goto skip;
559		}
560#if defined(KERBEROS)
561		rval = klogin(pw, "", hostname, passwd);
562		if (rval == 0)
563			goto skip;
564#endif
565#ifdef SKEY
566		if (skey_haskey(pw->pw_name) == 0 &&
567		   (skey_passcheck(pw->pw_name, passwd) != -1)) {
568			rval = 0;
569			goto skip;
570		}
571#endif
572		/* the strcmp does not catch null passwords! */
573		if (pw == NULL || *pw->pw_passwd == '\0' ||
574		    strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) {
575			rval = 1;	 /* failure */
576			goto skip;
577		}
578		rval = 0;
579
580skip:
581		/*
582		 * If rval == 1, the user failed the authentication check
583		 * above.  If rval == 0, either Kerberos or local authentication
584		 * succeeded.
585		 */
586		if (rval) {
587			reply(530, "Login incorrect.");
588			if (logging)
589				syslog(LOG_NOTICE,
590				    "FTP LOGIN FAILED FROM %s, %s",
591				    remotehost, curname);
592			pw = NULL;
593			if (login_attempts++ >= 5) {
594				syslog(LOG_NOTICE,
595				    "repeated login failures from %s",
596				    remotehost);
597				exit(0);
598			}
599			return;
600		}
601	}
602	login_attempts = 0;		/* this time successful */
603	if (setegid((gid_t)pw->pw_gid) < 0) {
604		reply(550, "Can't set gid.");
605		return;
606	}
607	(void) initgroups(pw->pw_name, pw->pw_gid);
608
609	/* open wtmp before chroot */
610	logwtmp(ttyline, pw->pw_name, remotehost);
611
612	/* open utmp before chroot */
613	if (doutmp) {
614		memset((void *)&utmp, 0, sizeof(utmp));
615		(void)time(&utmp.ut_time);
616		(void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name));
617		(void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host));
618		(void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line));
619		login(&utmp);
620	}
621
622	logged_in = 1;
623
624	dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name);
625	if (guest) {
626		/*
627		 * We MUST do a chdir() after the chroot. Otherwise
628		 * the old current directory will be accessible as "."
629		 * outside the new root!
630		 */
631		if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
632			reply(550, "Can't set guest privileges.");
633			goto bad;
634		}
635	} else if (dochroot) {
636		if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
637			reply(550, "Can't change root.");
638			goto bad;
639		}
640	} else if (chdir(pw->pw_dir) < 0) {
641		if (chdir("/") < 0) {
642			reply(530, "User %s: can't change directory to %s.",
643			    pw->pw_name, pw->pw_dir);
644			goto bad;
645		} else
646			lreply(230, "No directory! Logging in with home=/");
647	}
648	if (seteuid((uid_t)pw->pw_uid) < 0) {
649		reply(550, "Can't set uid.");
650		goto bad;
651	}
652	/*
653	 * Display a login message, if it exists.
654	 * N.B. reply(230,) must follow the message.
655	 */
656	if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) {
657		char *cp, line[LINE_MAX];
658
659		while (fgets(line, sizeof(line), fd) != NULL) {
660			if ((cp = strchr(line, '\n')) != NULL)
661				*cp = '\0';
662			lreply(230, "%s", line);
663		}
664		(void) fflush(stdout);
665		(void) fclose(fd);
666	}
667	if (guest) {
668		reply(230, "Guest login ok, access restrictions apply.");
669#ifdef HASSETPROCTITLE
670		snprintf(proctitle, sizeof(proctitle),
671		    "%s: anonymous/%.*s", remotehost,
672		    sizeof(proctitle) - sizeof(remotehost) -
673		    sizeof(": anonymous/"), passwd);
674		setproctitle(proctitle);
675#endif /* HASSETPROCTITLE */
676		if (logging)
677			syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
678			    remotehost, passwd);
679	} else {
680		reply(230, "User %s logged in.", pw->pw_name);
681#ifdef HASSETPROCTITLE
682		snprintf(proctitle, sizeof(proctitle),
683		    "%s: %s", remotehost, pw->pw_name);
684		setproctitle(proctitle);
685#endif /* HASSETPROCTITLE */
686		if (logging)
687			syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
688			    remotehost, pw->pw_name);
689	}
690	(void) umask(defumask);
691	return;
692bad:
693	/* Forget all about it... */
694	end_login();
695}
696
697void
698retrieve(cmd, name)
699	char *cmd, *name;
700{
701	FILE *fin, *dout;
702	struct stat st;
703	int (*closefunc) __P((FILE *));
704
705	if (cmd == 0) {
706		fin = fopen(name, "r"), closefunc = fclose;
707		st.st_size = 0;
708	} else {
709		char line[BUFSIZ];
710
711		(void) sprintf(line, cmd, name), name = line;
712		fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
713		st.st_size = -1;
714		st.st_blksize = BUFSIZ;
715	}
716	if (fin == NULL) {
717		if (errno != 0) {
718			perror_reply(550, name);
719			if (cmd == 0) {
720				LOGCMD("get", name);
721			}
722		}
723		return;
724	}
725	byte_count = -1;
726	if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) {
727		reply(550, "%s: not a plain file.", name);
728		goto done;
729	}
730	if (restart_point) {
731		if (type == TYPE_A) {
732			off_t i, n;
733			int c;
734
735			n = restart_point;
736			i = 0;
737			while (i++ < n) {
738				if ((c=getc(fin)) == EOF) {
739					perror_reply(550, name);
740					goto done;
741				}
742				if (c == '\n')
743					i++;
744			}
745		} else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
746			perror_reply(550, name);
747			goto done;
748		}
749	}
750	dout = dataconn(name, st.st_size, "w");
751	if (dout == NULL)
752		goto done;
753	send_data(fin, dout, st.st_blksize);
754	(void) fclose(dout);
755	data = -1;
756	pdata = -1;
757done:
758	if (cmd == 0)
759		LOGBYTES("get", name, byte_count);
760	(*closefunc)(fin);
761}
762
763void
764store(name, mode, unique)
765	char *name, *mode;
766	int unique;
767{
768	FILE *fout, *din;
769	struct stat st;
770	int (*closefunc) __P((FILE *));
771
772	if (unique && stat(name, &st) == 0 &&
773	    (name = gunique(name)) == NULL) {
774		LOGCMD(*mode == 'w' ? "put" : "append", name);
775		return;
776	}
777
778	if (restart_point)
779		mode = "r+";
780	fout = fopen(name, mode);
781	closefunc = fclose;
782	if (fout == NULL) {
783		perror_reply(553, name);
784		LOGCMD(*mode == 'w' ? "put" : "append", name);
785		return;
786	}
787	byte_count = -1;
788	if (restart_point) {
789		if (type == TYPE_A) {
790			off_t i, n;
791			int c;
792
793			n = restart_point;
794			i = 0;
795			while (i++ < n) {
796				if ((c=getc(fout)) == EOF) {
797					perror_reply(550, name);
798					goto done;
799				}
800				if (c == '\n')
801					i++;
802			}
803			/*
804			 * We must do this seek to "current" position
805			 * because we are changing from reading to
806			 * writing.
807			 */
808			if (fseek(fout, 0L, L_INCR) < 0) {
809				perror_reply(550, name);
810				goto done;
811			}
812		} else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
813			perror_reply(550, name);
814			goto done;
815		}
816	}
817	din = dataconn(name, (off_t)-1, "r");
818	if (din == NULL)
819		goto done;
820	if (receive_data(din, fout) == 0) {
821		if (unique)
822			reply(226, "Transfer complete (unique file name:%s).",
823			    name);
824		else
825			reply(226, "Transfer complete.");
826	}
827	(void) fclose(din);
828	data = -1;
829	pdata = -1;
830done:
831	LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
832	(*closefunc)(fout);
833}
834
835static FILE *
836getdatasock(mode)
837	char *mode;
838{
839	int on = 1, s, t, tries;
840
841	if (data >= 0)
842		return (fdopen(data, mode));
843	(void) seteuid((uid_t)0);
844	s = socket(AF_INET, SOCK_STREAM, 0);
845	if (s < 0)
846		goto bad;
847	if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
848	    (char *) &on, sizeof(on)) < 0)
849		goto bad;
850	/* anchor socket to avoid multi-homing problems */
851	data_source.sin_len = sizeof(struct sockaddr_in);
852	data_source.sin_family = AF_INET;
853	data_source.sin_addr = ctrl_addr.sin_addr;
854	for (tries = 1; ; tries++) {
855		if (bind(s, (struct sockaddr *)&data_source,
856		    sizeof(data_source)) >= 0)
857			break;
858		if (errno != EADDRINUSE || tries > 10)
859			goto bad;
860		sleep(tries);
861	}
862	(void) seteuid((uid_t)pw->pw_uid);
863#ifdef IP_TOS
864	on = IPTOS_THROUGHPUT;
865	if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
866		syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
867#endif
868	return (fdopen(s, mode));
869bad:
870	/* Return the real value of errno (close may change it) */
871	t = errno;
872	(void) seteuid((uid_t)pw->pw_uid);
873	(void) close(s);
874	errno = t;
875	return (NULL);
876}
877
878static FILE *
879dataconn(name, size, mode)
880	char *name;
881	off_t size;
882	char *mode;
883{
884	char sizebuf[32];
885	FILE *file;
886	int retry = 0, tos;
887
888	file_size = size;
889	byte_count = 0;
890	if (size != (off_t) -1)
891		(void) sprintf(sizebuf, " (%qd bytes)", size);
892	else
893		(void) strcpy(sizebuf, "");
894	if (pdata >= 0) {
895		struct sockaddr_in from;
896		int s, fromlen = sizeof(from);
897
898		s = accept(pdata, (struct sockaddr *)&from, &fromlen);
899		if (s < 0) {
900			reply(425, "Can't open data connection.");
901			(void) close(pdata);
902			pdata = -1;
903			return (NULL);
904		}
905		(void) close(pdata);
906		pdata = s;
907#ifdef IP_TOS
908		tos = IPTOS_THROUGHPUT;
909		(void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos,
910		    sizeof(int));
911#endif
912		reply(150, "Opening %s mode data connection for '%s'%s.",
913		     type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
914		return (fdopen(pdata, mode));
915	}
916	if (data >= 0) {
917		reply(125, "Using existing data connection for '%s'%s.",
918		    name, sizebuf);
919		usedefault = 1;
920		return (fdopen(data, mode));
921	}
922	if (usedefault)
923		data_dest = his_addr;
924	usedefault = 1;
925	file = getdatasock(mode);
926	if (file == NULL) {
927		reply(425, "Can't create data socket (%s,%d): %s.",
928		    inet_ntoa(data_source.sin_addr),
929		    ntohs(data_source.sin_port), strerror(errno));
930		return (NULL);
931	}
932	data = fileno(file);
933	while (connect(data, (struct sockaddr *)&data_dest,
934	    sizeof(data_dest)) < 0) {
935		if (errno == EADDRINUSE && retry < swaitmax) {
936			sleep((unsigned) swaitint);
937			retry += swaitint;
938			continue;
939		}
940		perror_reply(425, "Can't build data connection");
941		(void) fclose(file);
942		data = -1;
943		return (NULL);
944	}
945	reply(150, "Opening %s mode data connection for '%s'%s.",
946	     type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
947	return (file);
948}
949
950/*
951 * Tranfer the contents of "instr" to "outstr" peer using the appropriate
952 * encapsulation of the data subject * to Mode, Structure, and Type.
953 *
954 * NB: Form isn't handled.
955 */
956static void
957send_data(instr, outstr, blksize)
958	FILE *instr, *outstr;
959	off_t blksize;
960{
961	int c, cnt, filefd, netfd;
962	char *buf;
963
964	transflag++;
965	if (setjmp(urgcatch)) {
966		transflag = 0;
967		return;
968	}
969	switch (type) {
970
971	case TYPE_A:
972		while ((c = getc(instr)) != EOF) {
973			byte_count++;
974			if (c == '\n') {
975				if (ferror(outstr))
976					goto data_err;
977				(void) putc('\r', outstr);
978			}
979			(void) putc(c, outstr);
980		}
981		fflush(outstr);
982		transflag = 0;
983		if (ferror(instr))
984			goto file_err;
985		if (ferror(outstr))
986			goto data_err;
987		reply(226, "Transfer complete.");
988		return;
989
990	case TYPE_I:
991	case TYPE_L:
992		if ((buf = malloc((u_int)blksize)) == NULL) {
993			transflag = 0;
994			perror_reply(451, "Local resource failure: malloc");
995			return;
996		}
997		netfd = fileno(outstr);
998		filefd = fileno(instr);
999		while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 &&
1000		    write(netfd, buf, cnt) == cnt)
1001			byte_count += cnt;
1002		transflag = 0;
1003		(void)free(buf);
1004		if (cnt != 0) {
1005			if (cnt < 0)
1006				goto file_err;
1007			goto data_err;
1008		}
1009		reply(226, "Transfer complete.");
1010		return;
1011	default:
1012		transflag = 0;
1013		reply(550, "Unimplemented TYPE %d in send_data", type);
1014		return;
1015	}
1016
1017data_err:
1018	transflag = 0;
1019	perror_reply(426, "Data connection");
1020	return;
1021
1022file_err:
1023	transflag = 0;
1024	perror_reply(551, "Error on input file");
1025}
1026
1027/*
1028 * Transfer data from peer to "outstr" using the appropriate encapulation of
1029 * the data subject to Mode, Structure, and Type.
1030 *
1031 * N.B.: Form isn't handled.
1032 */
1033static int
1034receive_data(instr, outstr)
1035	FILE *instr, *outstr;
1036{
1037	int c;
1038	int cnt, bare_lfs = 0;
1039	char buf[BUFSIZ];
1040
1041	transflag++;
1042	if (setjmp(urgcatch)) {
1043		transflag = 0;
1044		return (-1);
1045	}
1046	switch (type) {
1047
1048	case TYPE_I:
1049	case TYPE_L:
1050		while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) {
1051			if (write(fileno(outstr), buf, cnt) != cnt)
1052				goto file_err;
1053			byte_count += cnt;
1054		}
1055		if (cnt < 0)
1056			goto data_err;
1057		transflag = 0;
1058		return (0);
1059
1060	case TYPE_E:
1061		reply(553, "TYPE E not implemented.");
1062		transflag = 0;
1063		return (-1);
1064
1065	case TYPE_A:
1066		while ((c = getc(instr)) != EOF) {
1067			byte_count++;
1068			if (c == '\n')
1069				bare_lfs++;
1070			while (c == '\r') {
1071				if (ferror(outstr))
1072					goto data_err;
1073				if ((c = getc(instr)) != '\n') {
1074					(void) putc ('\r', outstr);
1075					if (c == '\0' || c == EOF)
1076						goto contin2;
1077				}
1078			}
1079			(void) putc(c, outstr);
1080	contin2:	;
1081		}
1082		fflush(outstr);
1083		if (ferror(instr))
1084			goto data_err;
1085		if (ferror(outstr))
1086			goto file_err;
1087		transflag = 0;
1088		if (bare_lfs) {
1089			lreply(226,
1090		"WARNING! %d bare linefeeds received in ASCII mode",
1091			    bare_lfs);
1092		(void)printf("   File may not have transferred correctly.\r\n");
1093		}
1094		return (0);
1095	default:
1096		reply(550, "Unimplemented TYPE %d in receive_data", type);
1097		transflag = 0;
1098		return (-1);
1099	}
1100
1101data_err:
1102	transflag = 0;
1103	perror_reply(426, "Data Connection");
1104	return (-1);
1105
1106file_err:
1107	transflag = 0;
1108	perror_reply(452, "Error writing file");
1109	return (-1);
1110}
1111
1112void
1113statfilecmd(filename)
1114	char *filename;
1115{
1116	FILE *fin;
1117	int c;
1118	char line[LINE_MAX];
1119
1120	(void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename);
1121	fin = ftpd_popen(line, "r");
1122	lreply(211, "status of %s:", filename);
1123	while ((c = getc(fin)) != EOF) {
1124		if (c == '\n') {
1125			if (ferror(stdout)){
1126				perror_reply(421, "control connection");
1127				(void) ftpd_pclose(fin);
1128				dologout(1);
1129				/* NOTREACHED */
1130			}
1131			if (ferror(fin)) {
1132				perror_reply(551, filename);
1133				(void) ftpd_pclose(fin);
1134				return;
1135			}
1136			(void) putc('\r', stdout);
1137		}
1138		(void) putc(c, stdout);
1139	}
1140	(void) ftpd_pclose(fin);
1141	reply(211, "End of Status");
1142}
1143
1144void
1145statcmd()
1146{
1147	struct sockaddr_in *sin;
1148	u_char *a, *p;
1149
1150	lreply(211, "%s FTP server status:", hostname, version);
1151	printf("     %s\r\n", version);
1152	printf("     Connected to %s", remotehost);
1153	if (!isdigit(remotehost[0]))
1154		printf(" (%s)", inet_ntoa(his_addr.sin_addr));
1155	printf("\r\n");
1156	if (logged_in) {
1157		if (guest)
1158			printf("     Logged in anonymously\r\n");
1159		else
1160			printf("     Logged in as %s\r\n", pw->pw_name);
1161	} else if (askpasswd)
1162		printf("     Waiting for password\r\n");
1163	else
1164		printf("     Waiting for user name\r\n");
1165	printf("     TYPE: %s", typenames[type]);
1166	if (type == TYPE_A || type == TYPE_E)
1167		printf(", FORM: %s", formnames[form]);
1168	if (type == TYPE_L)
1169#if NBBY == 8
1170		printf(" %d", NBBY);
1171#else
1172		printf(" %d", bytesize);	/* need definition! */
1173#endif
1174	printf("; STRUcture: %s; transfer MODE: %s\r\n",
1175	    strunames[stru], modenames[mode]);
1176	if (data != -1)
1177		printf("     Data connection open\r\n");
1178	else if (pdata != -1) {
1179		printf("     in Passive mode");
1180		sin = &pasv_addr;
1181		goto printaddr;
1182	} else if (usedefault == 0) {
1183		printf("     PORT");
1184		sin = &data_dest;
1185printaddr:
1186		a = (u_char *) &sin->sin_addr;
1187		p = (u_char *) &sin->sin_port;
1188#define UC(b) (((int) b) & 0xff)
1189		printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]),
1190			UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
1191#undef UC
1192	} else
1193		printf("     No data connection\r\n");
1194	reply(211, "End of status");
1195}
1196
1197void
1198fatal(s)
1199	char *s;
1200{
1201
1202	reply(451, "Error in server: %s\n", s);
1203	reply(221, "Closing connection due to server error.");
1204	dologout(0);
1205	/* NOTREACHED */
1206}
1207
1208void
1209#if __STDC__
1210reply(int n, const char *fmt, ...)
1211#else
1212reply(n, fmt, va_alist)
1213	int n;
1214	char *fmt;
1215        va_dcl
1216#endif
1217{
1218	va_list ap;
1219#if __STDC__
1220	va_start(ap, fmt);
1221#else
1222	va_start(ap);
1223#endif
1224	(void)printf("%d ", n);
1225	(void)vprintf(fmt, ap);
1226	(void)printf("\r\n");
1227	(void)fflush(stdout);
1228	if (debug) {
1229		syslog(LOG_DEBUG, "<--- %d ", n);
1230		vsyslog(LOG_DEBUG, fmt, ap);
1231	}
1232}
1233
1234void
1235#if __STDC__
1236lreply(int n, const char *fmt, ...)
1237#else
1238lreply(n, fmt, va_alist)
1239	int n;
1240	char *fmt;
1241        va_dcl
1242#endif
1243{
1244	va_list ap;
1245#if __STDC__
1246	va_start(ap, fmt);
1247#else
1248	va_start(ap);
1249#endif
1250	(void)printf("%d- ", n);
1251	(void)vprintf(fmt, ap);
1252	(void)printf("\r\n");
1253	(void)fflush(stdout);
1254	if (debug) {
1255		syslog(LOG_DEBUG, "<--- %d- ", n);
1256		vsyslog(LOG_DEBUG, fmt, ap);
1257	}
1258}
1259
1260static void
1261ack(s)
1262	char *s;
1263{
1264
1265	reply(250, "%s command successful.", s);
1266}
1267
1268void
1269nack(s)
1270	char *s;
1271{
1272
1273	reply(502, "%s command not implemented.", s);
1274}
1275
1276/* ARGSUSED */
1277void
1278yyerror(s)
1279	char *s;
1280{
1281	char *cp;
1282
1283	if (cp = strchr(cbuf,'\n'))
1284		*cp = '\0';
1285	reply(500, "'%s': command not understood.", cbuf);
1286}
1287
1288void
1289delete(name)
1290	char *name;
1291{
1292	struct stat st;
1293
1294	LOGCMD("delete", name);
1295	if (stat(name, &st) < 0) {
1296		perror_reply(550, name);
1297		return;
1298	}
1299	if ((st.st_mode&S_IFMT) == S_IFDIR) {
1300		if (rmdir(name) < 0) {
1301			perror_reply(550, name);
1302			return;
1303		}
1304		goto done;
1305	}
1306	if (unlink(name) < 0) {
1307		perror_reply(550, name);
1308		return;
1309	}
1310done:
1311	ack("DELE");
1312}
1313
1314void
1315cwd(path)
1316	char *path;
1317{
1318
1319	if (chdir(path) < 0)
1320		perror_reply(550, path);
1321	else
1322		ack("CWD");
1323}
1324
1325void
1326makedir(name)
1327	char *name;
1328{
1329
1330	LOGCMD("mkdir", name);
1331	if (mkdir(name, 0777) < 0)
1332		perror_reply(550, name);
1333	else
1334		reply(257, "MKD command successful.");
1335}
1336
1337void
1338removedir(name)
1339	char *name;
1340{
1341
1342	LOGCMD("rmdir", name);
1343	if (rmdir(name) < 0)
1344		perror_reply(550, name);
1345	else
1346		ack("RMD");
1347}
1348
1349void
1350pwd()
1351{
1352	char path[MAXPATHLEN + 1];
1353
1354	if (getwd(path) == (char *)NULL)
1355		reply(550, "%s.", path);
1356	else
1357		reply(257, "\"%s\" is current directory.", path);
1358}
1359
1360char *
1361renamefrom(name)
1362	char *name;
1363{
1364	struct stat st;
1365
1366	if (stat(name, &st) < 0) {
1367		perror_reply(550, name);
1368		return ((char *)0);
1369	}
1370	reply(350, "File exists, ready for destination name");
1371	return (name);
1372}
1373
1374void
1375renamecmd(from, to)
1376	char *from, *to;
1377{
1378
1379	LOGCMD2("rename", from, to);
1380	if (rename(from, to) < 0)
1381		perror_reply(550, "rename");
1382	else
1383		ack("RNTO");
1384}
1385
1386static void
1387dolog(sin)
1388	struct sockaddr_in *sin;
1389{
1390	struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
1391		sizeof(struct in_addr), AF_INET);
1392
1393	if (hp)
1394		(void) strncpy(remotehost, hp->h_name, sizeof(remotehost));
1395	else
1396		(void) strncpy(remotehost, inet_ntoa(sin->sin_addr),
1397		    sizeof(remotehost));
1398#ifdef HASSETPROCTITLE
1399	snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
1400	setproctitle(proctitle);
1401#endif /* HASSETPROCTITLE */
1402
1403	if (logging)
1404		syslog(LOG_INFO, "connection from %s", remotehost);
1405}
1406
1407/*
1408 * Record logout in wtmp file
1409 * and exit with supplied status.
1410 */
1411void
1412dologout(status)
1413	int status;
1414{
1415
1416	if (logged_in) {
1417		(void) seteuid((uid_t)0);
1418		logwtmp(ttyline, "", "");
1419		if (doutmp)
1420			logout(utmp.ut_line);
1421#if defined(KERBEROS)
1422		if (!notickets && krbtkfile_env)
1423			unlink(krbtkfile_env);
1424#endif
1425	}
1426	/* beware of flushing buffers after a SIGPIPE */
1427	_exit(status);
1428}
1429
1430static void
1431myoob(signo)
1432	int signo;
1433{
1434	char *cp;
1435
1436	/* only process if transfer occurring */
1437	if (!transflag)
1438		return;
1439	cp = tmpline;
1440	if (getline(cp, 7, stdin) == NULL) {
1441		reply(221, "You could at least say goodbye.");
1442		dologout(0);
1443	}
1444	upper(cp);
1445	if (strcmp(cp, "ABOR\r\n") == 0) {
1446		tmpline[0] = '\0';
1447		reply(426, "Transfer aborted. Data connection closed.");
1448		reply(226, "Abort successful");
1449		longjmp(urgcatch, 1);
1450	}
1451	if (strcmp(cp, "STAT\r\n") == 0) {
1452		if (file_size != (off_t) -1)
1453			reply(213, "Status: %qd of %qd bytes transferred",
1454			    byte_count, file_size);
1455		else
1456			reply(213, "Status: %qd bytes transferred", byte_count);
1457	}
1458}
1459
1460/*
1461 * Note: a response of 425 is not mentioned as a possible response to
1462 *	the PASV command in RFC959. However, it has been blessed as
1463 *	a legitimate response by Jon Postel in a telephone conversation
1464 *	with Rick Adams on 25 Jan 89.
1465 */
1466void
1467passive()
1468{
1469	int len;
1470	char *p, *a;
1471
1472	pdata = socket(AF_INET, SOCK_STREAM, 0);
1473	if (pdata < 0) {
1474		perror_reply(425, "Can't open passive connection");
1475		return;
1476	}
1477	pasv_addr = ctrl_addr;
1478	pasv_addr.sin_port = 0;
1479	(void) seteuid((uid_t)0);
1480	if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) {
1481		(void) seteuid((uid_t)pw->pw_uid);
1482		goto pasv_error;
1483	}
1484	(void) seteuid((uid_t)pw->pw_uid);
1485	len = sizeof(pasv_addr);
1486	if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
1487		goto pasv_error;
1488	if (listen(pdata, 1) < 0)
1489		goto pasv_error;
1490	a = (char *) &pasv_addr.sin_addr;
1491	p = (char *) &pasv_addr.sin_port;
1492
1493#define UC(b) (((int) b) & 0xff)
1494
1495	reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
1496		UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
1497	return;
1498
1499pasv_error:
1500	(void) close(pdata);
1501	pdata = -1;
1502	perror_reply(425, "Can't open passive connection");
1503	return;
1504}
1505
1506/*
1507 * Generate unique name for file with basename "local".
1508 * The file named "local" is already known to exist.
1509 * Generates failure reply on error.
1510 */
1511static char *
1512gunique(local)
1513	char *local;
1514{
1515	static char new[MAXPATHLEN];
1516	struct stat st;
1517	int count;
1518	char *cp;
1519
1520	cp = strrchr(local, '/');
1521	if (cp)
1522		*cp = '\0';
1523	if (stat(cp ? local : ".", &st) < 0) {
1524		perror_reply(553, cp ? local : ".");
1525		return ((char *) 0);
1526	}
1527	if (cp)
1528		*cp = '/';
1529	(void) strcpy(new, local);
1530	cp = new + strlen(new);
1531	*cp++ = '.';
1532	for (count = 1; count < 100; count++) {
1533		(void)sprintf(cp, "%d", count);
1534		if (stat(new, &st) < 0)
1535			return (new);
1536	}
1537	reply(452, "Unique file name cannot be created.");
1538	return (NULL);
1539}
1540
1541/*
1542 * Format and send reply containing system error number.
1543 */
1544void
1545perror_reply(code, string)
1546	int code;
1547	char *string;
1548{
1549
1550	reply(code, "%s: %s.", string, strerror(errno));
1551}
1552
1553static char *onefile[] = {
1554	"",
1555	0
1556};
1557
1558void
1559send_file_list(whichf)
1560	char *whichf;
1561{
1562	struct stat st;
1563	DIR *dirp = NULL;
1564	struct dirent *dir;
1565	FILE *dout = NULL;
1566	char **dirlist, *dirname;
1567	int simple = 0;
1568	int freeglob = 0;
1569	glob_t gl;
1570
1571	if (strpbrk(whichf, "~{[*?") != NULL) {
1572		int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
1573
1574		memset(&gl, 0, sizeof(gl));
1575		freeglob = 1;
1576		if (glob(whichf, flags, 0, &gl)) {
1577			reply(550, "not found");
1578			goto out;
1579		} else if (gl.gl_pathc == 0) {
1580			errno = ENOENT;
1581			perror_reply(550, whichf);
1582			goto out;
1583		}
1584		dirlist = gl.gl_pathv;
1585	} else {
1586		onefile[0] = whichf;
1587		dirlist = onefile;
1588		simple = 1;
1589	}
1590
1591	if (setjmp(urgcatch)) {
1592		transflag = 0;
1593		goto out;
1594	}
1595	while (dirname = *dirlist++) {
1596		if (stat(dirname, &st) < 0) {
1597			/*
1598			 * If user typed "ls -l", etc, and the client
1599			 * used NLST, do what the user meant.
1600			 */
1601			if (dirname[0] == '-' && *dirlist == NULL &&
1602			    transflag == 0) {
1603				retrieve("/bin/ls %s", dirname);
1604				goto out;
1605			}
1606			perror_reply(550, whichf);
1607			if (dout != NULL) {
1608				(void) fclose(dout);
1609				transflag = 0;
1610				data = -1;
1611				pdata = -1;
1612			}
1613			goto out;
1614		}
1615
1616		if (S_ISREG(st.st_mode)) {
1617			if (dout == NULL) {
1618				dout = dataconn("file list", (off_t)-1, "w");
1619				if (dout == NULL)
1620					goto out;
1621				transflag++;
1622			}
1623			fprintf(dout, "%s%s\n", dirname,
1624				type == TYPE_A ? "\r" : "");
1625			byte_count += strlen(dirname) + 1;
1626			continue;
1627		} else if (!S_ISDIR(st.st_mode))
1628			continue;
1629
1630		if ((dirp = opendir(dirname)) == NULL)
1631			continue;
1632
1633		while ((dir = readdir(dirp)) != NULL) {
1634			char nbuf[MAXPATHLEN];
1635
1636			if (dir->d_name[0] == '.' && dir->d_namlen == 1)
1637				continue;
1638			if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
1639			    dir->d_namlen == 2)
1640				continue;
1641
1642			sprintf(nbuf, "%s/%s", dirname, dir->d_name);
1643
1644			/*
1645			 * We have to do a stat to insure it's
1646			 * not a directory or special file.
1647			 */
1648			if (simple || (stat(nbuf, &st) == 0 &&
1649			    S_ISREG(st.st_mode))) {
1650				if (dout == NULL) {
1651					dout = dataconn("file list", (off_t)-1,
1652						"w");
1653					if (dout == NULL)
1654						goto out;
1655					transflag++;
1656				}
1657				if (nbuf[0] == '.' && nbuf[1] == '/')
1658					fprintf(dout, "%s%s\n", &nbuf[2],
1659						type == TYPE_A ? "\r" : "");
1660				else
1661					fprintf(dout, "%s%s\n", nbuf,
1662						type == TYPE_A ? "\r" : "");
1663				byte_count += strlen(nbuf) + 1;
1664			}
1665		}
1666		(void) closedir(dirp);
1667	}
1668
1669	if (dout == NULL)
1670		reply(550, "No files found.");
1671	else if (ferror(dout) != 0)
1672		perror_reply(550, "Data connection");
1673	else
1674		reply(226, "Transfer complete.");
1675
1676	transflag = 0;
1677	if (dout != NULL)
1678		(void) fclose(dout);
1679	data = -1;
1680	pdata = -1;
1681out:
1682	if (freeglob) {
1683		freeglob = 0;
1684		globfree(&gl);
1685	}
1686}
1687