1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * Trivial file transfer protocol server.
34 *
35 * This version includes many modifications by Jim Guyton
36 * <guyton@rand-unix>.
37 */
38
39 #include <sys/param.h>
40 #include <sys/ioctl.h>
41 #include <sys/socket.h>
42 #include <sys/stat.h>
43 #include <sys/time.h>
44
45 #include <netinet/in.h>
46 #include <arpa/tftp.h>
47
48 #include <ctype.h>
49 #include <errno.h>
50 #include <fcntl.h>
51 #include <netdb.h>
52 #include <pwd.h>
53 #include <stdint.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <syslog.h>
58 #include <time.h>
59 #include <unistd.h>
60
61 #include "tftp-file.h"
62 #include "tftp-io.h"
63 #include "tftp-utils.h"
64 #include "tftp-transfer.h"
65 #include "tftp-options.h"
66
67 #ifdef LIBWRAP
68 #include <tcpd.h>
69 #endif
70
71 static void tftp_wrq(int peer, char *, size_t);
72 static void tftp_rrq(int peer, char *, size_t);
73
74 /*
75 * Null-terminated directory prefix list for absolute pathname requests and
76 * search list for relative pathname requests.
77 *
78 * MAXDIRS should be at least as large as the number of arguments that
79 * inetd allows (currently 20).
80 */
81 #define MAXDIRS 20
82 static struct dirlist {
83 const char *name;
84 size_t len;
85 } dirs[MAXDIRS+1];
86 static int suppress_naks;
87 static int logging;
88 static int ipchroot;
89 static int check_woth = 1;
90 static int create_new = 0;
91 static const char *newfile_format = "%Y%m%d";
92 static int increase_name = 0;
93 static mode_t mask = S_IWGRP | S_IWOTH;
94
95 struct formats;
96 static void tftp_recvfile(int peer, const char *mode);
97 static void tftp_xmitfile(int peer, const char *mode);
98 static int validate_access(int peer, char **, int);
99 static char peername[NI_MAXHOST];
100
101 static FILE *file;
102
103 static struct formats {
104 const char *f_mode;
105 int f_convert;
106 } formats[] = {
107 { "netascii", 1 },
108 { "octet", 0 },
109 { NULL, 0 }
110 };
111
112 int
main(int argc,char * argv[])113 main(int argc, char *argv[])
114 {
115 struct tftphdr *tp;
116 int peer;
117 socklen_t peerlen, len;
118 ssize_t n;
119 int ch;
120 char *chroot_dir = NULL;
121 struct passwd *nobody;
122 const char *chuser = "nobody";
123 char recvbuffer[MAXPKTSIZE];
124 int allow_ro = 1, allow_wo = 1, block = 0, on = 1;
125 pid_t pid;
126
127 tzset(); /* syslog in localtime */
128 acting_as_client = 0;
129
130 tftp_openlog("tftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
131 while ((ch = getopt(argc, argv, "bcCd::F:lnoOp:s:Su:U:wW")) != -1) {
132 switch (ch) {
133 case 'b':
134 block = 1;
135 break;
136 case 'c':
137 ipchroot = 1;
138 break;
139 case 'C':
140 ipchroot = 2;
141 break;
142 case 'd':
143 if (optarg == NULL)
144 debug++;
145 else if (atoi(optarg) != 0)
146 debug += atoi(optarg);
147 else
148 debug |= debug_finds(optarg);
149 break;
150 case 'F':
151 newfile_format = optarg;
152 break;
153 case 'l':
154 logging = 1;
155 break;
156 case 'n':
157 suppress_naks = 1;
158 break;
159 case 'o':
160 options_rfc_enabled = 0;
161 break;
162 case 'O':
163 options_extra_enabled = 0;
164 break;
165 case 'p':
166 packetdroppercentage = (unsigned int)atoi(optarg);
167 tftp_log(LOG_INFO,
168 "Randomly dropping %d out of 100 packets",
169 packetdroppercentage);
170 break;
171 case 's':
172 chroot_dir = optarg;
173 break;
174 case 'S':
175 check_woth = -1;
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 /* Find out who we are talking to and what we are going to do */
220 peerlen = sizeof(peer_sock);
221 n = recvfrom(0, recvbuffer, MAXPKTSIZE, block ? 0 : MSG_DONTWAIT,
222 (struct sockaddr *)&peer_sock, &peerlen);
223 if (n < 0) {
224 tftp_log(LOG_ERR, "recvfrom: %s", strerror(errno));
225 exit(1);
226 }
227 getnameinfo((struct sockaddr *)&peer_sock, peer_sock.ss_len,
228 peername, sizeof(peername), NULL, 0, NI_NUMERICHOST);
229 if ((size_t)n < 4 /* tftphdr */) {
230 tftp_log(LOG_ERR, "Rejecting %zd-byte request from %s",
231 n, peername);
232 exit(1);
233 }
234
235 if (ioctl(0, FIONBIO, &on) < 0) {
236 tftp_log(LOG_ERR, "ioctl(FIONBIO): %s", strerror(errno));
237 exit(1);
238 }
239
240 /*
241 * Now that we have read the message out of the UDP
242 * socket, we fork and exit. Thus, inetd will go back
243 * to listening to the tftp port, and the next request
244 * to come in will start up a new instance of tftpd.
245 *
246 * We do this so that inetd can run tftpd in "wait" mode.
247 * The problem with tftpd running in "nowait" mode is that
248 * inetd may get one or more successful "selects" on the
249 * tftp port before we do our receive, so more than one
250 * instance of tftpd may be started up. Worse, if tftpd
251 * break before doing the above "recvfrom", inetd would
252 * spawn endless instances, clogging the system.
253 */
254 pid = fork();
255 if (pid < 0) {
256 tftp_log(LOG_ERR, "fork: %s", strerror(errno));
257 exit(1);
258 } else if (pid != 0) {
259 exit(0);
260 }
261 /* child */
262
263 #ifdef LIBWRAP
264 /*
265 * See if the client is allowed to talk to me.
266 * (This needs to be done before the chroot())
267 */
268 {
269 struct request_info req;
270
271 request_init(&req, RQ_CLIENT_ADDR, peername, 0);
272 request_set(&req, RQ_DAEMON, "tftpd", 0);
273
274 if (hosts_access(&req) == 0) {
275 if (debug & DEBUG_ACCESS)
276 tftp_log(LOG_WARNING,
277 "Access denied by 'tftpd' entry "
278 "in /etc/hosts.allow");
279
280 /*
281 * Full access might be disabled, but maybe the
282 * client is allowed to do read-only access.
283 */
284 request_set(&req, RQ_DAEMON, "tftpd-ro", 0);
285 allow_ro = hosts_access(&req);
286
287 request_set(&req, RQ_DAEMON, "tftpd-wo", 0);
288 allow_wo = hosts_access(&req);
289
290 if (allow_ro == 0 && allow_wo == 0) {
291 tftp_log(LOG_WARNING,
292 "Unauthorized access from %s", peername);
293 exit(1);
294 }
295
296 if (debug & DEBUG_ACCESS) {
297 if (allow_ro)
298 tftp_log(LOG_WARNING,
299 "But allowed readonly access "
300 "via 'tftpd-ro' entry");
301 if (allow_wo)
302 tftp_log(LOG_WARNING,
303 "But allowed writeonly access "
304 "via 'tftpd-wo' entry");
305 }
306 } else
307 if (debug & DEBUG_ACCESS)
308 tftp_log(LOG_WARNING,
309 "Full access allowed"
310 "in /etc/hosts.allow");
311 }
312 #endif
313
314 /*
315 * Since we exit here, we should do that only after the above
316 * recvfrom to keep inetd from constantly forking should there
317 * be a problem. See the above comment about system clogging.
318 */
319 if (chroot_dir) {
320 if (ipchroot > 0) {
321 char *tempchroot;
322 struct stat sb;
323 int statret;
324 struct sockaddr_storage ss;
325 char hbuf[NI_MAXHOST];
326
327 statret = -1;
328 memcpy(&ss, &peer_sock, peer_sock.ss_len);
329 unmappedaddr((struct sockaddr_in6 *)&ss);
330 getnameinfo((struct sockaddr *)&ss, ss.ss_len,
331 hbuf, sizeof(hbuf), NULL, 0,
332 NI_NUMERICHOST);
333 asprintf(&tempchroot, "%s/%s", chroot_dir, hbuf);
334 if (ipchroot == 2)
335 statret = stat(tempchroot, &sb);
336 if (ipchroot == 1 ||
337 (statret == 0 && (sb.st_mode & S_IFDIR)))
338 chroot_dir = tempchroot;
339 }
340 /* Must get this before chroot because /etc might go away */
341 if ((nobody = getpwnam(chuser)) == NULL) {
342 tftp_log(LOG_ERR, "%s: no such user", chuser);
343 exit(1);
344 }
345 if (chroot(chroot_dir)) {
346 tftp_log(LOG_ERR, "chroot: %s: %s",
347 chroot_dir, strerror(errno));
348 exit(1);
349 }
350 if (chdir("/") != 0) {
351 tftp_log(LOG_ERR, "chdir: %s", strerror(errno));
352 exit(1);
353 }
354 if (setgroups(1, &nobody->pw_gid) != 0) {
355 tftp_log(LOG_ERR, "setgroups failed");
356 exit(1);
357 }
358 if (setuid(nobody->pw_uid) != 0) {
359 tftp_log(LOG_ERR, "setuid failed");
360 exit(1);
361 }
362 if (check_woth == -1)
363 check_woth = 0;
364 }
365 if (check_woth == -1)
366 check_woth = 1;
367
368 len = sizeof(me_sock);
369 if (getsockname(0, (struct sockaddr *)&me_sock, &len) == 0) {
370 switch (me_sock.ss_family) {
371 case AF_INET:
372 ((struct sockaddr_in *)&me_sock)->sin_port = 0;
373 break;
374 case AF_INET6:
375 ((struct sockaddr_in6 *)&me_sock)->sin6_port = 0;
376 break;
377 default:
378 /* unsupported */
379 break;
380 }
381 } else {
382 memset(&me_sock, 0, sizeof(me_sock));
383 me_sock.ss_family = peer_sock.ss_family;
384 me_sock.ss_len = peer_sock.ss_len;
385 }
386 close(STDIN_FILENO);
387 close(STDOUT_FILENO);
388 close(STDERR_FILENO);
389 peer = socket(peer_sock.ss_family, SOCK_DGRAM, 0);
390 if (peer < 0) {
391 tftp_log(LOG_ERR, "socket: %s", strerror(errno));
392 exit(1);
393 }
394 if (bind(peer, (struct sockaddr *)&me_sock, me_sock.ss_len) < 0) {
395 tftp_log(LOG_ERR, "bind: %s", strerror(errno));
396 exit(1);
397 }
398
399 tp = (struct tftphdr *)recvbuffer;
400 tp->th_opcode = ntohs(tp->th_opcode);
401 if (tp->th_opcode == RRQ) {
402 if (allow_ro)
403 tftp_rrq(peer, tp->th_stuff, (size_t)n - 1);
404 else {
405 tftp_log(LOG_WARNING,
406 "%s read access denied", peername);
407 exit(1);
408 }
409 } else if (tp->th_opcode == WRQ) {
410 if (allow_wo)
411 tftp_wrq(peer, tp->th_stuff, (size_t)n - 1);
412 else {
413 tftp_log(LOG_WARNING,
414 "%s write access denied", peername);
415 exit(1);
416 }
417 } else
418 send_error(peer, EBADOP);
419 exit(1);
420 }
421
422 static void
reduce_path(char * fn)423 reduce_path(char *fn)
424 {
425 char *slash, *ptr;
426
427 /* Reduce all "/+./" to "/" (just in case we've got "/./../" later */
428 while ((slash = strstr(fn, "/./")) != NULL) {
429 for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
430 ;
431 slash += 2;
432 while (*slash)
433 *++ptr = *++slash;
434 }
435
436 /* Now reduce all "/something/+../" to "/" */
437 while ((slash = strstr(fn, "/../")) != NULL) {
438 if (slash == fn)
439 break;
440 for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
441 ;
442 for (ptr--; ptr >= fn; ptr--)
443 if (*ptr == '/')
444 break;
445 if (ptr < fn)
446 break;
447 slash += 3;
448 while (*slash)
449 *++ptr = *++slash;
450 }
451 }
452
453 static char *
parse_header(int peer,char * recvbuffer,size_t size,char ** filename,char ** mode)454 parse_header(int peer, char *recvbuffer, size_t size,
455 char **filename, char **mode)
456 {
457 struct formats *pf;
458 char *cp;
459 size_t i;
460
461 *mode = NULL;
462 cp = recvbuffer;
463
464 i = get_field(peer, recvbuffer, size);
465 if (i >= PATH_MAX) {
466 tftp_log(LOG_ERR, "Bad option - filename too long");
467 send_error(peer, EBADOP);
468 exit(1);
469 }
470 *filename = recvbuffer;
471 tftp_log(LOG_INFO, "Filename: '%s'", *filename);
472 cp += i;
473
474 i = get_field(peer, cp, size);
475 *mode = cp;
476
477 /* Find the file transfer mode */
478 for (; *cp; cp++)
479 if (isupper((unsigned char)*cp))
480 *cp = tolower((unsigned char)*cp);
481 for (pf = formats; pf->f_mode; pf++)
482 if (strcmp(pf->f_mode, *mode) == 0)
483 break;
484 if (pf->f_mode == NULL) {
485 tftp_log(LOG_ERR,
486 "Bad option - Unknown transfer mode (%s)", *mode);
487 send_error(peer, EBADOP);
488 exit(1);
489 }
490 tftp_log(LOG_INFO, "Mode: '%s'", *mode);
491
492 return (cp + 1);
493 }
494
495 /*
496 * WRQ - receive a file from the client
497 */
498 void
tftp_wrq(int peer,char * recvbuffer,size_t size)499 tftp_wrq(int peer, char *recvbuffer, size_t size)
500 {
501 char *cp;
502 int has_options = 0, ecode;
503 char *filename, *mode;
504 char fnbuf[PATH_MAX];
505
506 cp = parse_header(peer, recvbuffer, size, &filename, &mode);
507 size -= (cp - recvbuffer) + 1;
508
509 strlcpy(fnbuf, filename, sizeof(fnbuf));
510 reduce_path(fnbuf);
511 filename = fnbuf;
512
513 if (size > 0) {
514 if (options_rfc_enabled)
515 has_options = !parse_options(peer, cp, size);
516 else
517 tftp_log(LOG_INFO, "Options found but not enabled");
518 }
519
520 ecode = validate_access(peer, &filename, WRQ);
521 if (ecode == 0) {
522 if (has_options)
523 send_oack(peer);
524 else
525 send_ack(peer, 0);
526 }
527 if (logging) {
528 tftp_log(LOG_INFO, "%s: write request for %s: %s", peername,
529 filename, errtomsg(ecode));
530 }
531
532 if (ecode) {
533 send_error(peer, ecode);
534 exit(1);
535 }
536 tftp_recvfile(peer, mode);
537 exit(0);
538 }
539
540 /*
541 * RRQ - send a file to the client
542 */
543 void
tftp_rrq(int peer,char * recvbuffer,size_t size)544 tftp_rrq(int peer, char *recvbuffer, size_t size)
545 {
546 char *cp;
547 int has_options = 0, ecode;
548 char *filename, *mode;
549 char fnbuf[PATH_MAX];
550
551 cp = parse_header(peer, recvbuffer, size, &filename, &mode);
552 size -= (cp - recvbuffer) + 1;
553
554 strlcpy(fnbuf, filename, sizeof(fnbuf));
555 reduce_path(fnbuf);
556 filename = fnbuf;
557
558 if (size > 0) {
559 if (options_rfc_enabled)
560 has_options = !parse_options(peer, cp, size);
561 else
562 tftp_log(LOG_INFO, "Options found but not enabled");
563 }
564
565 ecode = validate_access(peer, &filename, RRQ);
566 if (ecode == 0) {
567 if (has_options) {
568 int n;
569 char lrecvbuffer[MAXPKTSIZE];
570 struct tftphdr *rp = (struct tftphdr *)lrecvbuffer;
571
572 send_oack(peer);
573 n = receive_packet(peer, lrecvbuffer, MAXPKTSIZE,
574 NULL, timeoutpacket);
575 if (n < 0) {
576 if (debug & DEBUG_SIMPLE)
577 tftp_log(LOG_DEBUG, "Aborting: %s",
578 rp_strerror(n));
579 return;
580 }
581 if (rp->th_opcode != ACK) {
582 if (debug & DEBUG_SIMPLE)
583 tftp_log(LOG_DEBUG,
584 "Expected ACK, got %s on OACK",
585 packettype(rp->th_opcode));
586 return;
587 }
588 }
589 }
590
591 if (logging)
592 tftp_log(LOG_INFO, "%s: read request for %s: %s", peername,
593 filename, errtomsg(ecode));
594
595 if (ecode) {
596 /*
597 * Avoid storms of naks to a RRQ broadcast for a relative
598 * bootfile pathname from a diskless Sun.
599 */
600 if (suppress_naks && *filename != '/' && ecode == ENOTFOUND)
601 exit(0);
602 send_error(peer, ecode);
603 exit(1);
604 }
605 tftp_xmitfile(peer, mode);
606 }
607
608 /*
609 * Find the next value for YYYYMMDD.nn when the file to be written should
610 * be unique. Due to the limitations of nn, we will fail if nn reaches 100.
611 * Besides, that is four updates per hour on a file, which is kind of
612 * execessive anyway.
613 */
614 static int
find_next_name(char * filename,int * fd)615 find_next_name(char *filename, int *fd)
616 {
617 /*
618 * GCC "knows" that we might write all of yyyymmdd plus the static
619 * elemenents in the format into into newname and thus complains
620 * unless we reduce the size. This array is still too big, but since
621 * the format is user supplied, it's not clear what a better limit
622 * value would be and this is sufficent to silence the warnings.
623 */
624 static const int suffix_len = strlen("..00");
625 char yyyymmdd[MAXPATHLEN - suffix_len];
626 char newname[MAXPATHLEN];
627 int i, ret;
628 time_t tval;
629 size_t len, namelen;
630 struct tm lt;
631
632 /* Create the YYYYMMDD part of the filename */
633 time(&tval);
634 lt = *localtime(&tval);
635 len = strftime(yyyymmdd, sizeof(yyyymmdd), newfile_format, <);
636 if (len == 0) {
637 syslog(LOG_WARNING,
638 "Filename suffix too long (%zu characters maximum)",
639 sizeof(yyyymmdd) - 1);
640 return (EACCESS);
641 }
642
643 /* Make sure the new filename is not too long */
644 namelen = strlen(filename);
645 if (namelen >= sizeof(newname) - len - suffix_len) {
646 syslog(LOG_WARNING,
647 "Filename too long (%zu characters, %zu maximum)",
648 namelen,
649 sizeof(newname) - len - suffix_len - 1);
650 return (EACCESS);
651 }
652
653 /* Find the first file which doesn't exist */
654 for (i = 0; i < 100; i++) {
655 ret = snprintf(newname, sizeof(newname), "%s.%s.%02d",
656 filename, yyyymmdd, i);
657 /*
658 * Size checked above so this can't happen, we'd use a
659 * (void) cast, but gcc intentionally ignores that if
660 * snprintf has __attribute__((warn_unused_result)).
661 */
662 if (ret < 0 || (size_t)ret >= sizeof(newname))
663 __unreachable();
664 *fd = open(newname, O_WRONLY | O_CREAT | O_EXCL, 0666);
665 if (*fd > 0)
666 return 0;
667 }
668
669 return (EEXIST);
670 }
671
672 /*
673 * Validate file access. Since we
674 * have no uid or gid, for now require
675 * file to exist and be publicly
676 * readable/writable.
677 * If we were invoked with arguments
678 * from inetd then the file must also be
679 * in one of the given directory prefixes.
680 * Note also, full path name must be
681 * given as we have no login directory.
682 */
683 int
validate_access(int peer,char ** filep,int mode)684 validate_access(int peer, char **filep, int mode)
685 {
686 static char pathname[MAXPATHLEN];
687 struct stat sb;
688 struct dirlist *dirp;
689 char *filename = *filep;
690 int err, fd;
691
692 /*
693 * Prevent tricksters from getting around the directory restrictions
694 */
695 if (strncmp(filename, "../", 3) == 0 ||
696 strstr(filename, "/../") != NULL)
697 return (EACCESS);
698
699 if (*filename == '/') {
700 /*
701 * Absolute file name: allow the request if it's in one of the
702 * approved locations.
703 */
704 for (dirp = dirs; dirp->name != NULL; dirp++) {
705 if (dirp->len == 1)
706 /* Only "/" can have len 1 */
707 break;
708 if (strncmp(filename, dirp->name, dirp->len) == 0 &&
709 filename[dirp->len] == '/')
710 break;
711 }
712 /* If directory list is empty, allow access to any file */
713 if (dirp->name == NULL && dirp != dirs)
714 return (EACCESS);
715 if (stat(filename, &sb) != 0)
716 return (errno == ENOENT ? ENOTFOUND : EACCESS);
717 if (!S_ISREG(sb.st_mode))
718 return (ENOTFOUND);
719 if (mode == RRQ) {
720 if ((sb.st_mode & S_IROTH) == 0)
721 return (EACCESS);
722 } else {
723 if (check_woth && (sb.st_mode & S_IWOTH) == 0)
724 return (EACCESS);
725 }
726 } else {
727 /*
728 * Relative file name: search the approved locations for it.
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, &sb) != 0)
738 continue;
739 if (!S_ISREG(sb.st_mode))
740 continue;
741 err = EACCESS;
742 if (mode == RRQ) {
743 if ((sb.st_mode & S_IROTH) == 0)
744 continue;
745 } else {
746 if (check_woth && (sb.st_mode & S_IWOTH) == 0)
747 continue;
748 }
749 break;
750 }
751 if (dirp->name != NULL)
752 *filep = filename = pathname;
753 else if (mode == RRQ)
754 return (err);
755 else if (err != ENOTFOUND || !create_new)
756 return (err);
757 }
758
759 /*
760 * This option is handled here because it (might) require(s) the
761 * size of the file.
762 */
763 option_tsize(peer, NULL, mode, &sb);
764
765 if (mode == RRQ) {
766 fd = open(filename, O_RDONLY);
767 } else if (create_new) {
768 if (increase_name) {
769 err = find_next_name(filename, &fd);
770 if (err > 0)
771 return (err + 100);
772 } else {
773 fd = open(filename,
774 O_WRONLY | O_TRUNC | O_CREAT,
775 S_IRUSR | S_IWUSR | S_IRGRP |
776 S_IWGRP | S_IROTH | S_IWOTH );
777 }
778 } else {
779 fd = open(filename, O_WRONLY | O_TRUNC);
780 }
781 if (fd < 0)
782 return (errno + 100);
783 file = fdopen(fd, mode == RRQ ? "r" : "w");
784 if (file == NULL) {
785 close(fd);
786 return (errno + 100);
787 }
788 return (0);
789 }
790
791 static void
tftp_xmitfile(int peer,const char * mode)792 tftp_xmitfile(int peer, const char *mode)
793 {
794 uint16_t block;
795 time_t now;
796 struct tftp_stats ts;
797
798 memset(&ts, 0, sizeof(ts));
799 now = time(NULL);
800 if (debug & DEBUG_SIMPLE)
801 tftp_log(LOG_DEBUG, "Transmitting file");
802
803 read_init(0, file, mode);
804 block = 1;
805 tftp_send(peer, &block, &ts);
806 read_close();
807 if (debug & DEBUG_SIMPLE)
808 tftp_log(LOG_INFO, "Sent %jd bytes in %jd seconds",
809 (intmax_t)ts.amount, (intmax_t)time(NULL) - now);
810 }
811
812 static void
tftp_recvfile(int peer,const char * mode)813 tftp_recvfile(int peer, const char *mode)
814 {
815 uint16_t block;
816 struct timeval now1, now2;
817 struct tftp_stats ts;
818
819 gettimeofday(&now1, NULL);
820 if (debug & DEBUG_SIMPLE)
821 tftp_log(LOG_DEBUG, "Receiving file");
822
823 write_init(0, file, mode);
824
825 block = 0;
826 tftp_receive(peer, &block, &ts, NULL, 0);
827
828 gettimeofday(&now2, NULL);
829
830 if (debug & DEBUG_SIMPLE) {
831 double f;
832 if (now1.tv_usec > now2.tv_usec) {
833 now2.tv_usec += 1000000;
834 now2.tv_sec--;
835 }
836
837 f = now2.tv_sec - now1.tv_sec +
838 (now2.tv_usec - now1.tv_usec) / 100000.0;
839 tftp_log(LOG_INFO,
840 "Download of %jd bytes in %d blocks completed after %0.1f seconds\n",
841 (intmax_t)ts.amount, block, f);
842 }
843
844 return;
845 }
846