tftpd.c revision 213102 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1983, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)tftpd.c	8.1 (Berkeley) 6/4/93";
43#endif
44#endif /* not lint */
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD: head/libexec/tftpd/tftpd.c 213102 2010-09-24 14:44:04Z marius $");
47
48/*
49 * Trivial file transfer protocol server.
50 *
51 * This version includes many modifications by Jim Guyton
52 * <guyton@rand-unix>.
53 */
54
55#include <sys/param.h>
56#include <sys/ioctl.h>
57#include <sys/stat.h>
58#include <sys/socket.h>
59
60#include <netinet/in.h>
61#include <arpa/tftp.h>
62
63#include <ctype.h>
64#include <errno.h>
65#include <fcntl.h>
66#include <netdb.h>
67#include <pwd.h>
68#include <stdio.h>
69#include <stdlib.h>
70#include <string.h>
71#include <syslog.h>
72#include <tcpd.h>
73#include <unistd.h>
74
75#include "tftp-file.h"
76#include "tftp-io.h"
77#include "tftp-utils.h"
78#include "tftp-transfer.h"
79#include "tftp-options.h"
80
81static void	tftp_wrq(int peer, char *, ssize_t);
82static void	tftp_rrq(int peer, char *, ssize_t);
83
84/*
85 * Null-terminated directory prefix list for absolute pathname requests and
86 * search list for relative pathname requests.
87 *
88 * MAXDIRS should be at least as large as the number of arguments that
89 * inetd allows (currently 20).
90 */
91#define MAXDIRS	20
92static struct dirlist {
93	const char	*name;
94	int	len;
95} dirs[MAXDIRS+1];
96static int	suppress_naks;
97static int	logging;
98static int	ipchroot;
99static int	create_new = 0;
100static const char *newfile_format = "%Y%m%d";
101static int	increase_name = 0;
102static mode_t	mask = S_IWGRP | S_IWOTH;
103
104struct formats;
105static void	tftp_recvfile(int peer, const char *mode);
106static void	tftp_xmitfile(int peer, const char *mode);
107static int	validate_access(int peer, char **, int);
108static char	peername[NI_MAXHOST];
109
110FILE *file;
111
112struct formats {
113	const char	*f_mode;
114	int	f_convert;
115} formats[] = {
116	{ "netascii",	1 },
117	{ "octet",	0 },
118	{ NULL,		0 }
119};
120
121int
122main(int argc, char *argv[])
123{
124	struct tftphdr *tp;
125	int		peer;
126	socklen_t	peerlen, len;
127	ssize_t		n;
128	int		ch;
129	char		*chroot_dir = NULL;
130	struct passwd	*nobody;
131	const char	*chuser = "nobody";
132	char		recvbuffer[MAXPKTSIZE];
133	int		allow_ro = 1, allow_wo = 1;
134
135	tzset();			/* syslog in localtime */
136	acting_as_client = 0;
137
138	tftp_openlog("tftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
139	while ((ch = getopt(argc, argv, "cCd:F:lnoOp:s:u:U:wW")) != -1) {
140		switch (ch) {
141		case 'c':
142			ipchroot = 1;
143			break;
144		case 'C':
145			ipchroot = 2;
146			break;
147		case 'd':
148			if (atoi(optarg) != 0)
149				debug += atoi(optarg);
150			else
151				debug |= debug_finds(optarg);
152			break;
153		case 'F':
154			newfile_format = optarg;
155			break;
156		case 'l':
157			logging = 1;
158			break;
159		case 'n':
160			suppress_naks = 1;
161			break;
162		case 'o':
163			options_rfc_enabled = 0;
164			break;
165		case 'O':
166			options_extra_enabled = 0;
167			break;
168		case 'p':
169			packetdroppercentage = atoi(optarg);
170			tftp_log(LOG_INFO,
171			    "Randomly dropping %d out of 100 packets",
172			    packetdroppercentage);
173			break;
174		case 's':
175			chroot_dir = optarg;
176			break;
177		case 'u':
178			chuser = optarg;
179			break;
180		case 'U':
181			mask = strtol(optarg, NULL, 0);
182			break;
183		case 'w':
184			create_new = 1;
185			break;
186		case 'W':
187			create_new = 1;
188			increase_name = 1;
189			break;
190		default:
191			tftp_log(LOG_WARNING,
192				"ignoring unknown option -%c", ch);
193		}
194	}
195	if (optind < argc) {
196		struct dirlist *dirp;
197
198		/* Get list of directory prefixes. Skip relative pathnames. */
199		for (dirp = dirs; optind < argc && dirp < &dirs[MAXDIRS];
200		     optind++) {
201			if (argv[optind][0] == '/') {
202				dirp->name = argv[optind];
203				dirp->len  = strlen(dirp->name);
204				dirp++;
205			}
206		}
207	}
208	else if (chroot_dir) {
209		dirs->name = "/";
210		dirs->len = 1;
211	}
212	if (ipchroot > 0 && chroot_dir == NULL) {
213		tftp_log(LOG_ERR, "-c requires -s");
214		exit(1);
215	}
216
217	umask(mask);
218
219	{
220		int on = 1;
221		if (ioctl(0, FIONBIO, &on) < 0) {
222			tftp_log(LOG_ERR, "ioctl(FIONBIO): %s", strerror(errno));
223			exit(1);
224		}
225	}
226
227	/* Find out who we are talking to and what we are going to do */
228	peerlen = sizeof(peer_sock);
229	n = recvfrom(0, recvbuffer, MAXPKTSIZE, 0,
230	    (struct sockaddr *)&peer_sock, &peerlen);
231	if (n < 0) {
232		tftp_log(LOG_ERR, "recvfrom: %s", strerror(errno));
233		exit(1);
234	}
235	getnameinfo((struct sockaddr *)&peer_sock, peer_sock.ss_len,
236	    peername, sizeof(peername), NULL, 0, NI_NUMERICHOST);
237
238	/*
239	 * Now that we have read the message out of the UDP
240	 * socket, we fork and exit.  Thus, inetd will go back
241	 * to listening to the tftp port, and the next request
242	 * to come in will start up a new instance of tftpd.
243	 *
244	 * We do this so that inetd can run tftpd in "wait" mode.
245	 * The problem with tftpd running in "nowait" mode is that
246	 * inetd may get one or more successful "selects" on the
247	 * tftp port before we do our receive, so more than one
248	 * instance of tftpd may be started up.  Worse, if tftpd
249	 * break before doing the above "recvfrom", inetd would
250	 * spawn endless instances, clogging the system.
251	 */
252	{
253		int i, pid;
254
255		for (i = 1; i < 20; i++) {
256		    pid = fork();
257		    if (pid < 0) {
258				sleep(i);
259				/*
260				 * flush out to most recently sent request.
261				 *
262				 * This may drop some request, but those
263				 * will be resent by the clients when
264				 * they timeout.  The positive effect of
265				 * this flush is to (try to) prevent more
266				 * than one tftpd being started up to service
267				 * a single request from a single client.
268				 */
269				peerlen = sizeof peer_sock;
270				i = recvfrom(0, recvbuffer, MAXPKTSIZE, 0,
271				    (struct sockaddr *)&peer_sock, &peerlen);
272				if (i > 0) {
273					n = i;
274				}
275		    } else {
276				break;
277		    }
278		}
279		if (pid < 0) {
280			tftp_log(LOG_ERR, "fork: %s", strerror(errno));
281			exit(1);
282		} else if (pid != 0) {
283			exit(0);
284		}
285	}
286
287	/*
288	 * See if the client is allowed to talk to me.
289	 * (This needs to be done before the chroot())
290	 */
291	{
292		struct request_info req;
293
294		request_init(&req, RQ_CLIENT_ADDR, peername, 0);
295		request_set(&req, RQ_DAEMON, "tftpd", 0);
296
297		if (hosts_access(&req) == 0) {
298			if (debug&DEBUG_ACCESS)
299				tftp_log(LOG_WARNING,
300				    "Access denied by 'tftpd' entry "
301				    "in /etc/hosts.allow");
302
303			/*
304			 * Full access might be disabled, but maybe the
305			 * client is allowed to do read-only access.
306			 */
307			request_set(&req, RQ_DAEMON, "tftpd-ro", 0);
308			allow_ro = hosts_access(&req);
309
310			request_set(&req, RQ_DAEMON, "tftpd-wo", 0);
311			allow_wo = hosts_access(&req);
312
313			if (allow_ro == 0 && allow_wo == 0) {
314				tftp_log(LOG_WARNING,
315				    "Unauthorized access from %s", peername);
316				exit(1);
317			}
318
319			if (debug&DEBUG_ACCESS) {
320				if (allow_ro)
321					tftp_log(LOG_WARNING,
322					    "But allowed readonly access "
323					    "via 'tftpd-ro' entry");
324				if (allow_wo)
325					tftp_log(LOG_WARNING,
326					    "But allowed writeonly access "
327					    "via 'tftpd-wo' entry");
328			}
329		} else
330			if (debug&DEBUG_ACCESS)
331				tftp_log(LOG_WARNING,
332				    "Full access allowed"
333				    "in /etc/hosts.allow");
334	}
335
336	/*
337	 * Since we exit here, we should do that only after the above
338	 * recvfrom to keep inetd from constantly forking should there
339	 * be a problem.  See the above comment about system clogging.
340	 */
341	if (chroot_dir) {
342		if (ipchroot > 0) {
343			char *tempchroot;
344			struct stat sb;
345			int statret;
346			struct sockaddr_storage ss;
347			char hbuf[NI_MAXHOST];
348
349			statret = -1;
350			memcpy(&ss, &peer_sock, peer_sock.ss_len);
351			unmappedaddr((struct sockaddr_in6 *)&ss);
352			getnameinfo((struct sockaddr *)&ss, ss.ss_len,
353				    hbuf, sizeof(hbuf), NULL, 0,
354				    NI_NUMERICHOST);
355			asprintf(&tempchroot, "%s/%s", chroot_dir, hbuf);
356			if (ipchroot == 2)
357				statret = stat(tempchroot, &sb);
358			if (ipchroot == 1 ||
359			    (statret == 0 && (sb.st_mode & S_IFDIR)))
360				chroot_dir = tempchroot;
361		}
362		/* Must get this before chroot because /etc might go away */
363		if ((nobody = getpwnam(chuser)) == NULL) {
364			tftp_log(LOG_ERR, "%s: no such user", chuser);
365			exit(1);
366		}
367		if (chroot(chroot_dir)) {
368			tftp_log(LOG_ERR, "chroot: %s: %s",
369			    chroot_dir, strerror(errno));
370			exit(1);
371		}
372		chdir("/");
373		setgroups(1, &nobody->pw_gid);
374		setuid(nobody->pw_uid);
375	}
376
377	len = sizeof(me_sock);
378	if (getsockname(0, (struct sockaddr *)&me_sock, &len) == 0) {
379		switch (me_sock.ss_family) {
380		case AF_INET:
381			((struct sockaddr_in *)&me_sock)->sin_port = 0;
382			break;
383		case AF_INET6:
384			((struct sockaddr_in6 *)&me_sock)->sin6_port = 0;
385			break;
386		default:
387			/* unsupported */
388			break;
389		}
390	} else {
391		memset(&me_sock, 0, sizeof(me_sock));
392		me_sock.ss_family = peer_sock.ss_family;
393		me_sock.ss_len = peer_sock.ss_len;
394	}
395	close(0);
396	close(1);
397	peer = socket(peer_sock.ss_family, SOCK_DGRAM, 0);
398	if (peer < 0) {
399		tftp_log(LOG_ERR, "socket: %s", strerror(errno));
400		exit(1);
401	}
402	if (bind(peer, (struct sockaddr *)&me_sock, me_sock.ss_len) < 0) {
403		tftp_log(LOG_ERR, "bind: %s", strerror(errno));
404		exit(1);
405	}
406
407	tp = (struct tftphdr *)recvbuffer;
408	tp->th_opcode = ntohs(tp->th_opcode);
409	if (tp->th_opcode == RRQ) {
410		if (allow_ro)
411			tftp_rrq(peer, tp->th_stuff, n - 1);
412		else {
413			tftp_log(LOG_WARNING,
414			    "%s read access denied", peername);
415			exit(1);
416		}
417	}
418	if (tp->th_opcode == WRQ) {
419		if (allow_wo)
420			tftp_wrq(peer, tp->th_stuff, n - 1);
421		else {
422			tftp_log(LOG_WARNING,
423			    "%s write access denied", peername);
424			exit(1);
425		}
426	}
427	exit(1);
428}
429
430static void
431reduce_path(char *fn)
432{
433	char *slash, *ptr;
434
435	/* Reduce all "/+./" to "/" (just in case we've got "/./../" later */
436	while ((slash = strstr(fn, "/./")) != NULL) {
437		for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
438			;
439		slash += 2;
440		while (*slash)
441			*++ptr = *++slash;
442	}
443
444	/* Now reduce all "/something/+../" to "/" */
445	while ((slash = strstr(fn, "/../")) != NULL) {
446		if (slash == fn)
447			break;
448		for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
449			;
450		for (ptr--; ptr >= fn; ptr--)
451			if (*ptr == '/')
452				break;
453		if (ptr < fn)
454			break;
455		slash += 3;
456		while (*slash)
457			*++ptr = *++slash;
458	}
459}
460
461static char *
462parse_header(int peer, char *recvbuffer, ssize_t size,
463	char **filename, char **mode)
464{
465	char	*cp;
466	int	i;
467	struct formats *pf;
468
469	*mode = NULL;
470	cp = recvbuffer;
471
472	i = get_field(peer, recvbuffer, size);
473	if (i >= PATH_MAX) {
474		tftp_log(LOG_ERR, "Bad option - filename too long");
475		send_error(peer, EBADOP);
476		exit(1);
477	}
478	*filename = recvbuffer;
479	tftp_log(LOG_INFO, "Filename: '%s'", *filename);
480	cp += i;
481
482	i = get_field(peer, cp, size);
483	*mode = cp;
484	cp += i;
485
486	/* Find the file transfer mode */
487	for (cp = *mode; *cp; cp++)
488		if (isupper(*cp))
489			*cp = tolower(*cp);
490	for (pf = formats; pf->f_mode; pf++)
491		if (strcmp(pf->f_mode, *mode) == 0)
492			break;
493	if (pf->f_mode == NULL) {
494		tftp_log(LOG_ERR,
495		    "Bad option - Unknown transfer mode (%s)", *mode);
496		send_error(peer, EBADOP);
497		exit(1);
498	}
499	tftp_log(LOG_INFO, "Mode: '%s'", *mode);
500
501	return (cp + 1);
502}
503
504/*
505 * WRQ - receive a file from the client
506 */
507void
508tftp_wrq(int peer, char *recvbuffer, ssize_t size)
509{
510	char *cp;
511	int has_options = 0, ecode;
512	char *filename, *mode;
513	char fnbuf[PATH_MAX];
514
515	cp = parse_header(peer, recvbuffer, size, &filename, &mode);
516	size -= (cp - recvbuffer) + 1;
517
518	strcpy(fnbuf, filename);
519	reduce_path(fnbuf);
520	filename = fnbuf;
521
522	if (size > 0) {
523		if (options_rfc_enabled)
524			has_options = !parse_options(peer, cp, size);
525		else
526			tftp_log(LOG_INFO, "Options found but not enabled");
527	}
528
529	ecode = validate_access(peer, &filename, WRQ);
530	if (ecode == 0) {
531		if (has_options)
532			send_oack(peer);
533		else
534			send_ack(peer, 0);
535	}
536	if (logging) {
537		tftp_log(LOG_INFO, "%s: write request for %s: %s", peername,
538			    filename, errtomsg(ecode));
539	}
540
541	tftp_recvfile(peer, mode);
542	exit(0);
543}
544
545/*
546 * RRQ - send a file to the client
547 */
548void
549tftp_rrq(int peer, char *recvbuffer, ssize_t size)
550{
551	char *cp;
552	int has_options = 0, ecode;
553	char *filename, *mode;
554	char	fnbuf[PATH_MAX];
555
556	cp = parse_header(peer, recvbuffer, size, &filename, &mode);
557	size -= (cp - recvbuffer) + 1;
558
559	strcpy(fnbuf, filename);
560	reduce_path(fnbuf);
561	filename = fnbuf;
562
563	if (size > 0) {
564		if (options_rfc_enabled)
565			has_options = !parse_options(peer, cp, size);
566		else
567			tftp_log(LOG_INFO, "Options found but not enabled");
568	}
569
570	ecode = validate_access(peer, &filename, RRQ);
571	if (ecode == 0) {
572		if (has_options) {
573			int n;
574			char lrecvbuffer[MAXPKTSIZE];
575			struct tftphdr *rp = (struct tftphdr *)lrecvbuffer;
576
577			send_oack(peer);
578			n = receive_packet(peer, lrecvbuffer, MAXPKTSIZE,
579				NULL, timeoutpacket);
580			if (n < 0) {
581				if (debug&DEBUG_SIMPLE)
582					tftp_log(LOG_DEBUG, "Aborting: %s",
583					    rp_strerror(n));
584				return;
585			}
586			if (rp->th_opcode != ACK) {
587				if (debug&DEBUG_SIMPLE)
588					tftp_log(LOG_DEBUG,
589					    "Expected ACK, got %s on OACK",
590					    packettype(rp->th_opcode));
591				return;
592			}
593		}
594	}
595
596	if (logging)
597		tftp_log(LOG_INFO, "%s: read request for %s: %s", peername,
598			    filename, errtomsg(ecode));
599
600	if (ecode) {
601		/*
602		 * Avoid storms of naks to a RRQ broadcast for a relative
603		 * bootfile pathname from a diskless Sun.
604		 */
605		if (suppress_naks && *filename != '/' && ecode == ENOTFOUND)
606			exit(0);
607		send_error(peer, ecode);
608		exit(1);
609	}
610	tftp_xmitfile(peer, mode);
611}
612
613/*
614 * Find the next value for YYYYMMDD.nn when the file to be written should
615 * be unique. Due to the limitations of nn, we will fail if nn reaches 100.
616 * Besides, that is four updates per hour on a file, which is kind of
617 * execessive anyway.
618 */
619static int
620find_next_name(char *filename, int *fd)
621{
622	int i;
623	time_t tval;
624	size_t len;
625	struct tm lt;
626	char yyyymmdd[MAXPATHLEN];
627	char newname[MAXPATHLEN];
628
629	/* Create the YYYYMMDD part of the filename */
630	time(&tval);
631	lt = *localtime(&tval);
632	len = strftime(yyyymmdd, sizeof(yyyymmdd), newfile_format, &lt);
633	if (len == 0) {
634		syslog(LOG_WARNING,
635			"Filename suffix too long (%d characters maximum)",
636			MAXPATHLEN);
637		return (EACCESS);
638	}
639
640	/* Make sure the new filename is not too long */
641	if (strlen(filename) > MAXPATHLEN - len - 5) {
642		syslog(LOG_WARNING,
643			"Filename too long (%zd characters, %zd maximum)",
644			strlen(filename), MAXPATHLEN - len - 5);
645		return (EACCESS);
646	}
647
648	/* Find the first file which doesn't exist */
649	for (i = 0; i < 100; i++) {
650		sprintf(newname, "%s.%s.%02d", filename, yyyymmdd, i);
651		*fd = open(newname,
652		    O_WRONLY | O_CREAT | O_EXCL,
653		    S_IRUSR | S_IWUSR | S_IRGRP |
654		    S_IWGRP | S_IROTH | S_IWOTH);
655		if (*fd > 0)
656			return 0;
657	}
658
659	return (EEXIST);
660}
661
662/*
663 * Validate file access.  Since we
664 * have no uid or gid, for now require
665 * file to exist and be publicly
666 * readable/writable.
667 * If we were invoked with arguments
668 * from inetd then the file must also be
669 * in one of the given directory prefixes.
670 * Note also, full path name must be
671 * given as we have no login directory.
672 */
673int
674validate_access(int peer, char **filep, int mode)
675{
676	struct stat stbuf;
677	int	fd;
678	int	error;
679	struct dirlist *dirp;
680	static char pathname[MAXPATHLEN];
681	char *filename = *filep;
682
683	/*
684	 * Prevent tricksters from getting around the directory restrictions
685	 */
686	if (strstr(filename, "/../"))
687		return (EACCESS);
688
689	if (*filename == '/') {
690		/*
691		 * Allow the request if it's in one of the approved locations.
692		 * Special case: check the null prefix ("/") by looking
693		 * for length = 1 and relying on the arg. processing that
694		 * it's a /.
695		 */
696		for (dirp = dirs; dirp->name != NULL; dirp++) {
697			if (dirp->len == 1 ||
698			    (!strncmp(filename, dirp->name, dirp->len) &&
699			     filename[dirp->len] == '/'))
700				    break;
701		}
702		/* If directory list is empty, allow access to any file */
703		if (dirp->name == NULL && dirp != dirs)
704			return (EACCESS);
705		if (stat(filename, &stbuf) < 0)
706			return (errno == ENOENT ? ENOTFOUND : EACCESS);
707		if ((stbuf.st_mode & S_IFMT) != S_IFREG)
708			return (ENOTFOUND);
709		if (mode == RRQ) {
710			if ((stbuf.st_mode & S_IROTH) == 0)
711				return (EACCESS);
712		} else {
713			if ((stbuf.st_mode & S_IWOTH) == 0)
714				return (EACCESS);
715		}
716	} else {
717		int err;
718
719		/*
720		 * Relative file name: search the approved locations for it.
721		 * Don't allow write requests that avoid directory
722		 * restrictions.
723		 */
724
725		if (!strncmp(filename, "../", 3))
726			return (EACCESS);
727
728		/*
729		 * If the file exists in one of the directories and isn't
730		 * readable, continue looking. However, change the error code
731		 * to give an indication that the file exists.
732		 */
733		err = ENOTFOUND;
734		for (dirp = dirs; dirp->name != NULL; dirp++) {
735			snprintf(pathname, sizeof(pathname), "%s/%s",
736				dirp->name, filename);
737			if (stat(pathname, &stbuf) == 0 &&
738			    (stbuf.st_mode & S_IFMT) == S_IFREG) {
739				if ((stbuf.st_mode & S_IROTH) != 0) {
740					break;
741				}
742				err = EACCESS;
743			}
744		}
745		if (dirp->name != NULL)
746			*filep = filename = pathname;
747		else if (mode == RRQ)
748			return (err);
749	}
750
751	/*
752	 * This option is handled here because it (might) require(s) the
753	 * size of the file.
754	 */
755	option_tsize(peer, NULL, mode, &stbuf);
756
757	if (mode == RRQ)
758		fd = open(filename, O_RDONLY);
759	else {
760		if (create_new) {
761			if (increase_name) {
762				error = find_next_name(filename, &fd);
763				if (error > 0)
764					return (error + 100);
765			} else
766				fd = open(filename,
767				    O_WRONLY | O_TRUNC | O_CREAT,
768				    S_IRUSR | S_IWUSR | S_IRGRP |
769				    S_IWGRP | S_IROTH | S_IWOTH );
770		} else
771			fd = open(filename, O_WRONLY | O_TRUNC);
772	}
773	if (fd < 0)
774		return (errno + 100);
775	file = fdopen(fd, (mode == RRQ)? "r":"w");
776	if (file == NULL) {
777		close(fd);
778		return (errno + 100);
779	}
780	return (0);
781}
782
783static void
784tftp_xmitfile(int peer, const char *mode)
785{
786	uint16_t block;
787	time_t now;
788	struct tftp_stats ts;
789
790	now = time(NULL);
791	if (debug&DEBUG_SIMPLE)
792		tftp_log(LOG_DEBUG, "Transmitting file");
793
794	read_init(0, file, mode);
795	block = 1;
796	tftp_send(peer, &block, &ts);
797	read_close();
798	if (debug&DEBUG_SIMPLE)
799		tftp_log(LOG_INFO, "Sent %d bytes in %d seconds",
800		    ts.amount, time(NULL) - now);
801}
802
803static void
804tftp_recvfile(int peer, const char *mode)
805{
806	uint16_t block;
807	struct timeval now1, now2;
808	struct tftp_stats ts;
809
810	gettimeofday(&now1, NULL);
811	if (debug&DEBUG_SIMPLE)
812		tftp_log(LOG_DEBUG, "Receiving file");
813
814	write_init(0, file, mode);
815
816	block = 0;
817	tftp_receive(peer, &block, &ts, NULL, 0);
818
819	write_close();
820	gettimeofday(&now2, NULL);
821
822	if (debug&DEBUG_SIMPLE) {
823		double f;
824		if (now1.tv_usec > now2.tv_usec) {
825			now2.tv_usec += 1000000;
826			now2.tv_sec--;
827		}
828
829		f = now2.tv_sec - now1.tv_sec +
830		    (now2.tv_usec - now1.tv_usec) / 100000.0;
831		tftp_log(LOG_INFO,
832		    "Download of %d bytes in %d blocks completed after %0.1f seconds\n",
833		    ts.amount, block, f);
834	}
835
836	return;
837}
838