tftpd.c revision 246139 
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 246139 2013-01-31 00:02:36Z 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 <stdint.h>
69#include <stdio.h>
70#include <stdlib.h>
71#include <string.h>
72#include <syslog.h>
73#include <tcpd.h>
74#include <unistd.h>
75
76#include "tftp-file.h"
77#include "tftp-io.h"
78#include "tftp-utils.h"
79#include "tftp-transfer.h"
80#include "tftp-options.h"
81
82static void	tftp_wrq(int peer, char *, ssize_t);
83static void	tftp_rrq(int peer, char *, ssize_t);
84
85/*
86 * Null-terminated directory prefix list for absolute pathname requests and
87 * search list for relative pathname requests.
88 *
89 * MAXDIRS should be at least as large as the number of arguments that
90 * inetd allows (currently 20).
91 */
92#define MAXDIRS	20
93static struct dirlist {
94	const char	*name;
95	int	len;
96} dirs[MAXDIRS+1];
97static int	suppress_naks;
98static int	logging;
99static int	ipchroot;
100static int	create_new = 0;
101static const char *newfile_format = "%Y%m%d";
102static int	increase_name = 0;
103static mode_t	mask = S_IWGRP | S_IWOTH;
104
105struct formats;
106static void	tftp_recvfile(int peer, const char *mode);
107static void	tftp_xmitfile(int peer, const char *mode);
108static int	validate_access(int peer, char **, int);
109static char	peername[NI_MAXHOST];
110
111static FILE *file;
112
113static struct formats {
114	const char	*f_mode;
115	int	f_convert;
116} formats[] = {
117	{ "netascii",	1 },
118	{ "octet",	0 },
119	{ NULL,		0 }
120};
121
122int
123main(int argc, char *argv[])
124{
125	struct tftphdr *tp;
126	int		peer;
127	socklen_t	peerlen, len;
128	ssize_t		n;
129	int		ch;
130	char		*chroot_dir = NULL;
131	struct passwd	*nobody;
132	const char	*chuser = "nobody";
133	char		recvbuffer[MAXPKTSIZE];
134	int		allow_ro = 1, allow_wo = 1;
135
136	tzset();			/* syslog in localtime */
137	acting_as_client = 0;
138
139	tftp_openlog("tftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
140	while ((ch = getopt(argc, argv, "cCd:F:lnoOp:s:u:U:wW")) != -1) {
141		switch (ch) {
142		case 'c':
143			ipchroot = 1;
144			break;
145		case 'C':
146			ipchroot = 2;
147			break;
148		case 'd':
149			if (atoi(optarg) != 0)
150				debug += atoi(optarg);
151			else
152				debug |= debug_finds(optarg);
153			break;
154		case 'F':
155			newfile_format = optarg;
156			break;
157		case 'l':
158			logging = 1;
159			break;
160		case 'n':
161			suppress_naks = 1;
162			break;
163		case 'o':
164			options_rfc_enabled = 0;
165			break;
166		case 'O':
167			options_extra_enabled = 0;
168			break;
169		case 'p':
170			packetdroppercentage = atoi(optarg);
171			tftp_log(LOG_INFO,
172			    "Randomly dropping %d out of 100 packets",
173			    packetdroppercentage);
174			break;
175		case 's':
176			chroot_dir = optarg;
177			break;
178		case 'u':
179			chuser = optarg;
180			break;
181		case 'U':
182			mask = strtol(optarg, NULL, 0);
183			break;
184		case 'w':
185			create_new = 1;
186			break;
187		case 'W':
188			create_new = 1;
189			increase_name = 1;
190			break;
191		default:
192			tftp_log(LOG_WARNING,
193				"ignoring unknown option -%c", ch);
194		}
195	}
196	if (optind < argc) {
197		struct dirlist *dirp;
198
199		/* Get list of directory prefixes. Skip relative pathnames. */
200		for (dirp = dirs; optind < argc && dirp < &dirs[MAXDIRS];
201		     optind++) {
202			if (argv[optind][0] == '/') {
203				dirp->name = argv[optind];
204				dirp->len  = strlen(dirp->name);
205				dirp++;
206			}
207		}
208	}
209	else if (chroot_dir) {
210		dirs->name = "/";
211		dirs->len = 1;
212	}
213	if (ipchroot > 0 && chroot_dir == NULL) {
214		tftp_log(LOG_ERR, "-c requires -s");
215		exit(1);
216	}
217
218	umask(mask);
219
220	{
221		int on = 1;
222		if (ioctl(0, FIONBIO, &on) < 0) {
223			tftp_log(LOG_ERR, "ioctl(FIONBIO): %s", strerror(errno));
224			exit(1);
225		}
226	}
227
228	/* Find out who we are talking to and what we are going to do */
229	peerlen = sizeof(peer_sock);
230	n = recvfrom(0, recvbuffer, MAXPKTSIZE, 0,
231	    (struct sockaddr *)&peer_sock, &peerlen);
232	if (n < 0) {
233		tftp_log(LOG_ERR, "recvfrom: %s", strerror(errno));
234		exit(1);
235	}
236	getnameinfo((struct sockaddr *)&peer_sock, peer_sock.ss_len,
237	    peername, sizeof(peername), NULL, 0, NI_NUMERICHOST);
238
239	/*
240	 * Now that we have read the message out of the UDP
241	 * socket, we fork and exit.  Thus, inetd will go back
242	 * to listening to the tftp port, and the next request
243	 * to come in will start up a new instance of tftpd.
244	 *
245	 * We do this so that inetd can run tftpd in "wait" mode.
246	 * The problem with tftpd running in "nowait" mode is that
247	 * inetd may get one or more successful "selects" on the
248	 * tftp port before we do our receive, so more than one
249	 * instance of tftpd may be started up.  Worse, if tftpd
250	 * break before doing the above "recvfrom", inetd would
251	 * spawn endless instances, clogging the system.
252	 */
253	{
254		int i, pid;
255
256		for (i = 1; i < 20; i++) {
257		    pid = fork();
258		    if (pid < 0) {
259				sleep(i);
260				/*
261				 * flush out to most recently sent request.
262				 *
263				 * This may drop some request, but those
264				 * will be resent by the clients when
265				 * they timeout.  The positive effect of
266				 * this flush is to (try to) prevent more
267				 * than one tftpd being started up to service
268				 * a single request from a single client.
269				 */
270				peerlen = sizeof peer_sock;
271				i = recvfrom(0, recvbuffer, MAXPKTSIZE, 0,
272				    (struct sockaddr *)&peer_sock, &peerlen);
273				if (i > 0) {
274					n = i;
275				}
276		    } else {
277				break;
278		    }
279		}
280		if (pid < 0) {
281			tftp_log(LOG_ERR, "fork: %s", strerror(errno));
282			exit(1);
283		} else if (pid != 0) {
284			exit(0);
285		}
286	}
287
288	/*
289	 * See if the client is allowed to talk to me.
290	 * (This needs to be done before the chroot())
291	 */
292	{
293		struct request_info req;
294
295		request_init(&req, RQ_CLIENT_ADDR, peername, 0);
296		request_set(&req, RQ_DAEMON, "tftpd", 0);
297
298		if (hosts_access(&req) == 0) {
299			if (debug&DEBUG_ACCESS)
300				tftp_log(LOG_WARNING,
301				    "Access denied by 'tftpd' entry "
302				    "in /etc/hosts.allow");
303
304			/*
305			 * Full access might be disabled, but maybe the
306			 * client is allowed to do read-only access.
307			 */
308			request_set(&req, RQ_DAEMON, "tftpd-ro", 0);
309			allow_ro = hosts_access(&req);
310
311			request_set(&req, RQ_DAEMON, "tftpd-wo", 0);
312			allow_wo = hosts_access(&req);
313
314			if (allow_ro == 0 && allow_wo == 0) {
315				tftp_log(LOG_WARNING,
316				    "Unauthorized access from %s", peername);
317				exit(1);
318			}
319
320			if (debug&DEBUG_ACCESS) {
321				if (allow_ro)
322					tftp_log(LOG_WARNING,
323					    "But allowed readonly access "
324					    "via 'tftpd-ro' entry");
325				if (allow_wo)
326					tftp_log(LOG_WARNING,
327					    "But allowed writeonly access "
328					    "via 'tftpd-wo' entry");
329			}
330		} else
331			if (debug&DEBUG_ACCESS)
332				tftp_log(LOG_WARNING,
333				    "Full access allowed"
334				    "in /etc/hosts.allow");
335	}
336
337	/*
338	 * Since we exit here, we should do that only after the above
339	 * recvfrom to keep inetd from constantly forking should there
340	 * be a problem.  See the above comment about system clogging.
341	 */
342	if (chroot_dir) {
343		if (ipchroot > 0) {
344			char *tempchroot;
345			struct stat sb;
346			int statret;
347			struct sockaddr_storage ss;
348			char hbuf[NI_MAXHOST];
349
350			statret = -1;
351			memcpy(&ss, &peer_sock, peer_sock.ss_len);
352			unmappedaddr((struct sockaddr_in6 *)&ss);
353			getnameinfo((struct sockaddr *)&ss, ss.ss_len,
354				    hbuf, sizeof(hbuf), NULL, 0,
355				    NI_NUMERICHOST);
356			asprintf(&tempchroot, "%s/%s", chroot_dir, hbuf);
357			if (ipchroot == 2)
358				statret = stat(tempchroot, &sb);
359			if (ipchroot == 1 ||
360			    (statret == 0 && (sb.st_mode & S_IFDIR)))
361				chroot_dir = tempchroot;
362		}
363		/* Must get this before chroot because /etc might go away */
364		if ((nobody = getpwnam(chuser)) == NULL) {
365			tftp_log(LOG_ERR, "%s: no such user", chuser);
366			exit(1);
367		}
368		if (chroot(chroot_dir)) {
369			tftp_log(LOG_ERR, "chroot: %s: %s",
370			    chroot_dir, strerror(errno));
371			exit(1);
372		}
373		chdir("/");
374		setgroups(1, &nobody->pw_gid);
375		if (setuid(nobody->pw_uid) != 0) {
376			tftp_log(LOG_ERR, "setuid failed");
377			exit(1);
378		}
379	}
380
381	len = sizeof(me_sock);
382	if (getsockname(0, (struct sockaddr *)&me_sock, &len) == 0) {
383		switch (me_sock.ss_family) {
384		case AF_INET:
385			((struct sockaddr_in *)&me_sock)->sin_port = 0;
386			break;
387		case AF_INET6:
388			((struct sockaddr_in6 *)&me_sock)->sin6_port = 0;
389			break;
390		default:
391			/* unsupported */
392			break;
393		}
394	} else {
395		memset(&me_sock, 0, sizeof(me_sock));
396		me_sock.ss_family = peer_sock.ss_family;
397		me_sock.ss_len = peer_sock.ss_len;
398	}
399	close(0);
400	close(1);
401	peer = socket(peer_sock.ss_family, SOCK_DGRAM, 0);
402	if (peer < 0) {
403		tftp_log(LOG_ERR, "socket: %s", strerror(errno));
404		exit(1);
405	}
406	if (bind(peer, (struct sockaddr *)&me_sock, me_sock.ss_len) < 0) {
407		tftp_log(LOG_ERR, "bind: %s", strerror(errno));
408		exit(1);
409	}
410
411	tp = (struct tftphdr *)recvbuffer;
412	tp->th_opcode = ntohs(tp->th_opcode);
413	if (tp->th_opcode == RRQ) {
414		if (allow_ro)
415			tftp_rrq(peer, tp->th_stuff, n - 1);
416		else {
417			tftp_log(LOG_WARNING,
418			    "%s read access denied", peername);
419			exit(1);
420		}
421	}
422	if (tp->th_opcode == WRQ) {
423		if (allow_wo)
424			tftp_wrq(peer, tp->th_stuff, n - 1);
425		else {
426			tftp_log(LOG_WARNING,
427			    "%s write access denied", peername);
428			exit(1);
429		}
430	}
431	exit(1);
432}
433
434static void
435reduce_path(char *fn)
436{
437	char *slash, *ptr;
438
439	/* Reduce all "/+./" to "/" (just in case we've got "/./../" later */
440	while ((slash = strstr(fn, "/./")) != NULL) {
441		for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
442			;
443		slash += 2;
444		while (*slash)
445			*++ptr = *++slash;
446	}
447
448	/* Now reduce all "/something/+../" to "/" */
449	while ((slash = strstr(fn, "/../")) != NULL) {
450		if (slash == fn)
451			break;
452		for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
453			;
454		for (ptr--; ptr >= fn; ptr--)
455			if (*ptr == '/')
456				break;
457		if (ptr < fn)
458			break;
459		slash += 3;
460		while (*slash)
461			*++ptr = *++slash;
462	}
463}
464
465static char *
466parse_header(int peer, char *recvbuffer, ssize_t size,
467	char **filename, char **mode)
468{
469	char	*cp;
470	int	i;
471	struct formats *pf;
472
473	*mode = NULL;
474	cp = recvbuffer;
475
476	i = get_field(peer, recvbuffer, size);
477	if (i >= PATH_MAX) {
478		tftp_log(LOG_ERR, "Bad option - filename too long");
479		send_error(peer, EBADOP);
480		exit(1);
481	}
482	*filename = recvbuffer;
483	tftp_log(LOG_INFO, "Filename: '%s'", *filename);
484	cp += i;
485
486	i = get_field(peer, cp, size);
487	*mode = cp;
488	cp += i;
489
490	/* Find the file transfer mode */
491	for (cp = *mode; *cp; cp++)
492		if (isupper(*cp))
493			*cp = tolower(*cp);
494	for (pf = formats; pf->f_mode; pf++)
495		if (strcmp(pf->f_mode, *mode) == 0)
496			break;
497	if (pf->f_mode == NULL) {
498		tftp_log(LOG_ERR,
499		    "Bad option - Unknown transfer mode (%s)", *mode);
500		send_error(peer, EBADOP);
501		exit(1);
502	}
503	tftp_log(LOG_INFO, "Mode: '%s'", *mode);
504
505	return (cp + 1);
506}
507
508/*
509 * WRQ - receive a file from the client
510 */
511void
512tftp_wrq(int peer, char *recvbuffer, ssize_t size)
513{
514	char *cp;
515	int has_options = 0, ecode;
516	char *filename, *mode;
517	char fnbuf[PATH_MAX];
518
519	cp = parse_header(peer, recvbuffer, size, &filename, &mode);
520	size -= (cp - recvbuffer) + 1;
521
522	strcpy(fnbuf, filename);
523	reduce_path(fnbuf);
524	filename = fnbuf;
525
526	if (size > 0) {
527		if (options_rfc_enabled)
528			has_options = !parse_options(peer, cp, size);
529		else
530			tftp_log(LOG_INFO, "Options found but not enabled");
531	}
532
533	ecode = validate_access(peer, &filename, WRQ);
534	if (ecode == 0) {
535		if (has_options)
536			send_oack(peer);
537		else
538			send_ack(peer, 0);
539	}
540	if (logging) {
541		tftp_log(LOG_INFO, "%s: write request for %s: %s", peername,
542			    filename, errtomsg(ecode));
543	}
544
545	tftp_recvfile(peer, mode);
546	exit(0);
547}
548
549/*
550 * RRQ - send a file to the client
551 */
552void
553tftp_rrq(int peer, char *recvbuffer, ssize_t size)
554{
555	char *cp;
556	int has_options = 0, ecode;
557	char *filename, *mode;
558	char	fnbuf[PATH_MAX];
559
560	cp = parse_header(peer, recvbuffer, size, &filename, &mode);
561	size -= (cp - recvbuffer) + 1;
562
563	strcpy(fnbuf, filename);
564	reduce_path(fnbuf);
565	filename = fnbuf;
566
567	if (size > 0) {
568		if (options_rfc_enabled)
569			has_options = !parse_options(peer, cp, size);
570		else
571			tftp_log(LOG_INFO, "Options found but not enabled");
572	}
573
574	ecode = validate_access(peer, &filename, RRQ);
575	if (ecode == 0) {
576		if (has_options) {
577			int n;
578			char lrecvbuffer[MAXPKTSIZE];
579			struct tftphdr *rp = (struct tftphdr *)lrecvbuffer;
580
581			send_oack(peer);
582			n = receive_packet(peer, lrecvbuffer, MAXPKTSIZE,
583				NULL, timeoutpacket);
584			if (n < 0) {
585				if (debug&DEBUG_SIMPLE)
586					tftp_log(LOG_DEBUG, "Aborting: %s",
587					    rp_strerror(n));
588				return;
589			}
590			if (rp->th_opcode != ACK) {
591				if (debug&DEBUG_SIMPLE)
592					tftp_log(LOG_DEBUG,
593					    "Expected ACK, got %s on OACK",
594					    packettype(rp->th_opcode));
595				return;
596			}
597		}
598	}
599
600	if (logging)
601		tftp_log(LOG_INFO, "%s: read request for %s: %s", peername,
602			    filename, errtomsg(ecode));
603
604	if (ecode) {
605		/*
606		 * Avoid storms of naks to a RRQ broadcast for a relative
607		 * bootfile pathname from a diskless Sun.
608		 */
609		if (suppress_naks && *filename != '/' && ecode == ENOTFOUND)
610			exit(0);
611		send_error(peer, ecode);
612		exit(1);
613	}
614	tftp_xmitfile(peer, mode);
615}
616
617/*
618 * Find the next value for YYYYMMDD.nn when the file to be written should
619 * be unique. Due to the limitations of nn, we will fail if nn reaches 100.
620 * Besides, that is four updates per hour on a file, which is kind of
621 * execessive anyway.
622 */
623static int
624find_next_name(char *filename, int *fd)
625{
626	int i;
627	time_t tval;
628	size_t len;
629	struct tm lt;
630	char yyyymmdd[MAXPATHLEN];
631	char newname[MAXPATHLEN];
632
633	/* Create the YYYYMMDD part of the filename */
634	time(&tval);
635	lt = *localtime(&tval);
636	len = strftime(yyyymmdd, sizeof(yyyymmdd), newfile_format, &lt);
637	if (len == 0) {
638		syslog(LOG_WARNING,
639			"Filename suffix too long (%d characters maximum)",
640			MAXPATHLEN);
641		return (EACCESS);
642	}
643
644	/* Make sure the new filename is not too long */
645	if (strlen(filename) > MAXPATHLEN - len - 5) {
646		syslog(LOG_WARNING,
647			"Filename too long (%zd characters, %zd maximum)",
648			strlen(filename), MAXPATHLEN - len - 5);
649		return (EACCESS);
650	}
651
652	/* Find the first file which doesn't exist */
653	for (i = 0; i < 100; i++) {
654		sprintf(newname, "%s.%s.%02d", filename, yyyymmdd, i);
655		*fd = open(newname,
656		    O_WRONLY | O_CREAT | O_EXCL,
657		    S_IRUSR | S_IWUSR | S_IRGRP |
658		    S_IWGRP | S_IROTH | S_IWOTH);
659		if (*fd > 0)
660			return 0;
661	}
662
663	return (EEXIST);
664}
665
666/*
667 * Validate file access.  Since we
668 * have no uid or gid, for now require
669 * file to exist and be publicly
670 * readable/writable.
671 * If we were invoked with arguments
672 * from inetd then the file must also be
673 * in one of the given directory prefixes.
674 * Note also, full path name must be
675 * given as we have no login directory.
676 */
677int
678validate_access(int peer, char **filep, int mode)
679{
680	struct stat stbuf;
681	int	fd;
682	int	error;
683	struct dirlist *dirp;
684	static char pathname[MAXPATHLEN];
685	char *filename = *filep;
686
687	/*
688	 * Prevent tricksters from getting around the directory restrictions
689	 */
690	if (strstr(filename, "/../"))
691		return (EACCESS);
692
693	if (*filename == '/') {
694		/*
695		 * Allow the request if it's in one of the approved locations.
696		 * Special case: check the null prefix ("/") by looking
697		 * for length = 1 and relying on the arg. processing that
698		 * it's a /.
699		 */
700		for (dirp = dirs; dirp->name != NULL; dirp++) {
701			if (dirp->len == 1 ||
702			    (!strncmp(filename, dirp->name, dirp->len) &&
703			     filename[dirp->len] == '/'))
704				    break;
705		}
706		/* If directory list is empty, allow access to any file */
707		if (dirp->name == NULL && dirp != dirs)
708			return (EACCESS);
709		if (stat(filename, &stbuf) < 0)
710			return (errno == ENOENT ? ENOTFOUND : EACCESS);
711		if ((stbuf.st_mode & S_IFMT) != S_IFREG)
712			return (ENOTFOUND);
713		if (mode == RRQ) {
714			if ((stbuf.st_mode & S_IROTH) == 0)
715				return (EACCESS);
716		} else {
717			if ((stbuf.st_mode & S_IWOTH) == 0)
718				return (EACCESS);
719		}
720	} else {
721		int err;
722
723		/*
724		 * Relative file name: search the approved locations for it.
725		 * Don't allow write requests that avoid directory
726		 * restrictions.
727		 */
728
729		if (!strncmp(filename, "../", 3))
730			return (EACCESS);
731
732		/*
733		 * If the file exists in one of the directories and isn't
734		 * readable, continue looking. However, change the error code
735		 * to give an indication that the file exists.
736		 */
737		err = ENOTFOUND;
738		for (dirp = dirs; dirp->name != NULL; dirp++) {
739			snprintf(pathname, sizeof(pathname), "%s/%s",
740				dirp->name, filename);
741			if (stat(pathname, &stbuf) == 0 &&
742			    (stbuf.st_mode & S_IFMT) == S_IFREG) {
743				if ((stbuf.st_mode & S_IROTH) != 0) {
744					break;
745				}
746				err = EACCESS;
747			}
748		}
749		if (dirp->name != NULL)
750			*filep = filename = pathname;
751		else if (mode == RRQ)
752			return (err);
753	}
754
755	/*
756	 * This option is handled here because it (might) require(s) the
757	 * size of the file.
758	 */
759	option_tsize(peer, NULL, mode, &stbuf);
760
761	if (mode == RRQ)
762		fd = open(filename, O_RDONLY);
763	else {
764		if (create_new) {
765			if (increase_name) {
766				error = find_next_name(filename, &fd);
767				if (error > 0)
768					return (error + 100);
769			} else
770				fd = open(filename,
771				    O_WRONLY | O_TRUNC | O_CREAT,
772				    S_IRUSR | S_IWUSR | S_IRGRP |
773				    S_IWGRP | S_IROTH | S_IWOTH );
774		} else
775			fd = open(filename, O_WRONLY | O_TRUNC);
776	}
777	if (fd < 0)
778		return (errno + 100);
779	file = fdopen(fd, (mode == RRQ)? "r":"w");
780	if (file == NULL) {
781		close(fd);
782		return (errno + 100);
783	}
784	return (0);
785}
786
787static void
788tftp_xmitfile(int peer, const char *mode)
789{
790	uint16_t block;
791	time_t now;
792	struct tftp_stats ts;
793
794	now = time(NULL);
795	if (debug&DEBUG_SIMPLE)
796		tftp_log(LOG_DEBUG, "Transmitting file");
797
798	read_init(0, file, mode);
799	block = 1;
800	tftp_send(peer, &block, &ts);
801	read_close();
802	if (debug&DEBUG_SIMPLE)
803		tftp_log(LOG_INFO, "Sent %jd bytes in %jd seconds",
804		    (intmax_t)ts.amount, (intmax_t)time(NULL) - now);
805}
806
807static void
808tftp_recvfile(int peer, const char *mode)
809{
810	uint16_t block;
811	struct timeval now1, now2;
812	struct tftp_stats ts;
813
814	gettimeofday(&now1, NULL);
815	if (debug&DEBUG_SIMPLE)
816		tftp_log(LOG_DEBUG, "Receiving file");
817
818	write_init(0, file, mode);
819
820	block = 0;
821	tftp_receive(peer, &block, &ts, NULL, 0);
822
823	write_close();
824	gettimeofday(&now2, NULL);
825
826	if (debug&DEBUG_SIMPLE) {
827		double f;
828		if (now1.tv_usec > now2.tv_usec) {
829			now2.tv_usec += 1000000;
830			now2.tv_sec--;
831		}
832
833		f = now2.tv_sec - now1.tv_sec +
834		    (now2.tv_usec - now1.tv_usec) / 100000.0;
835		tftp_log(LOG_INFO,
836		    "Download of %jd bytes in %d blocks completed after %0.1f seconds\n",
837		    (intmax_t)ts.amount, block, f);
838	}
839
840	return;
841}
842