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 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(0, NULL) != 0) { 355 tftp_log(LOG_ERR, "setgroups failed"); 356 exit(1); 357 } 358 if (setgid(nobody->pw_gid) != 0) { 359 tftp_log(LOG_ERR, "setgid failed"); 360 exit(1); 361 } 362 if (setuid(nobody->pw_uid) != 0) { 363 tftp_log(LOG_ERR, "setuid failed"); 364 exit(1); 365 } 366 if (check_woth == -1) 367 check_woth = 0; 368 } 369 if (check_woth == -1) 370 check_woth = 1; 371 372 len = sizeof(me_sock); 373 if (getsockname(0, (struct sockaddr *)&me_sock, &len) == 0) { 374 switch (me_sock.ss_family) { 375 case AF_INET: 376 ((struct sockaddr_in *)&me_sock)->sin_port = 0; 377 break; 378 case AF_INET6: 379 ((struct sockaddr_in6 *)&me_sock)->sin6_port = 0; 380 break; 381 default: 382 /* unsupported */ 383 break; 384 } 385 } else { 386 memset(&me_sock, 0, sizeof(me_sock)); 387 me_sock.ss_family = peer_sock.ss_family; 388 me_sock.ss_len = peer_sock.ss_len; 389 } 390 close(STDIN_FILENO); 391 close(STDOUT_FILENO); 392 close(STDERR_FILENO); 393 peer = socket(peer_sock.ss_family, SOCK_DGRAM, 0); 394 if (peer < 0) { 395 tftp_log(LOG_ERR, "socket: %s", strerror(errno)); 396 exit(1); 397 } 398 if (bind(peer, (struct sockaddr *)&me_sock, me_sock.ss_len) < 0) { 399 tftp_log(LOG_ERR, "bind: %s", strerror(errno)); 400 exit(1); 401 } 402 403 tp = (struct tftphdr *)recvbuffer; 404 tp->th_opcode = ntohs(tp->th_opcode); 405 if (tp->th_opcode == RRQ) { 406 if (allow_ro) 407 tftp_rrq(peer, tp->th_stuff, (size_t)n - 1); 408 else { 409 tftp_log(LOG_WARNING, 410 "%s read access denied", peername); 411 exit(1); 412 } 413 } else if (tp->th_opcode == WRQ) { 414 if (allow_wo) 415 tftp_wrq(peer, tp->th_stuff, (size_t)n - 1); 416 else { 417 tftp_log(LOG_WARNING, 418 "%s write access denied", peername); 419 exit(1); 420 } 421 } else 422 send_error(peer, EBADOP); 423 exit(1); 424 } 425 426 static void 427 reduce_path(char *fn) 428 { 429 char *slash, *ptr; 430 431 /* Reduce all "/+./" to "/" (just in case we've got "/./../" later */ 432 while ((slash = strstr(fn, "/./")) != NULL) { 433 for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--) 434 ; 435 slash += 2; 436 while (*slash) 437 *++ptr = *++slash; 438 } 439 440 /* Now reduce all "/something/+../" to "/" */ 441 while ((slash = strstr(fn, "/../")) != NULL) { 442 if (slash == fn) 443 break; 444 for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--) 445 ; 446 for (ptr--; ptr >= fn; ptr--) 447 if (*ptr == '/') 448 break; 449 if (ptr < fn) 450 break; 451 slash += 3; 452 while (*slash) 453 *++ptr = *++slash; 454 } 455 } 456 457 static char * 458 parse_header(int peer, char *recvbuffer, size_t size, 459 char **filename, char **mode) 460 { 461 struct formats *pf; 462 char *cp; 463 size_t i; 464 465 *mode = NULL; 466 cp = recvbuffer; 467 468 i = get_field(peer, recvbuffer, size); 469 if (i >= PATH_MAX) { 470 tftp_log(LOG_ERR, "Bad option - filename too long"); 471 send_error(peer, EBADOP); 472 exit(1); 473 } 474 *filename = recvbuffer; 475 tftp_log(LOG_INFO, "Filename: '%s'", *filename); 476 cp += i; 477 478 i = get_field(peer, cp, size); 479 *mode = cp; 480 481 /* Find the file transfer mode */ 482 for (; *cp; cp++) 483 if (isupper((unsigned char)*cp)) 484 *cp = tolower((unsigned char)*cp); 485 for (pf = formats; pf->f_mode; pf++) 486 if (strcmp(pf->f_mode, *mode) == 0) 487 break; 488 if (pf->f_mode == NULL) { 489 tftp_log(LOG_ERR, 490 "Bad option - Unknown transfer mode (%s)", *mode); 491 send_error(peer, EBADOP); 492 exit(1); 493 } 494 tftp_log(LOG_INFO, "Mode: '%s'", *mode); 495 496 return (cp + 1); 497 } 498 499 /* 500 * WRQ - receive a file from the client 501 */ 502 void 503 tftp_wrq(int peer, char *recvbuffer, size_t size) 504 { 505 char *cp; 506 int has_options = 0, ecode; 507 char *filename, *mode; 508 char fnbuf[PATH_MAX]; 509 510 cp = parse_header(peer, recvbuffer, size, &filename, &mode); 511 size -= (cp - recvbuffer) + 1; 512 513 strlcpy(fnbuf, filename, sizeof(fnbuf)); 514 reduce_path(fnbuf); 515 filename = fnbuf; 516 517 if (size > 0) { 518 if (options_rfc_enabled) 519 has_options = !parse_options(peer, cp, size); 520 else 521 tftp_log(LOG_INFO, "Options found but not enabled"); 522 } 523 524 ecode = validate_access(peer, &filename, WRQ); 525 if (ecode == 0) { 526 if (has_options) 527 send_oack(peer); 528 else 529 send_ack(peer, 0); 530 } 531 if (logging) { 532 tftp_log(LOG_INFO, "%s: write request for %s: %s", peername, 533 filename, errtomsg(ecode)); 534 } 535 536 if (ecode) { 537 send_error(peer, ecode); 538 exit(1); 539 } 540 tftp_recvfile(peer, mode); 541 exit(0); 542 } 543 544 /* 545 * RRQ - send a file to the client 546 */ 547 void 548 tftp_rrq(int peer, char *recvbuffer, size_t size) 549 { 550 char *cp; 551 int has_options = 0, ecode; 552 char *filename, *mode; 553 char fnbuf[PATH_MAX]; 554 555 cp = parse_header(peer, recvbuffer, size, &filename, &mode); 556 size -= (cp - recvbuffer) + 1; 557 558 strlcpy(fnbuf, filename, sizeof(fnbuf)); 559 reduce_path(fnbuf); 560 filename = fnbuf; 561 562 if (size > 0) { 563 if (options_rfc_enabled) 564 has_options = !parse_options(peer, cp, size); 565 else 566 tftp_log(LOG_INFO, "Options found but not enabled"); 567 } 568 569 ecode = validate_access(peer, &filename, RRQ); 570 if (ecode == 0) { 571 if (has_options) { 572 int n; 573 char lrecvbuffer[MAXPKTSIZE]; 574 struct tftphdr *rp = (struct tftphdr *)lrecvbuffer; 575 576 send_oack(peer); 577 n = receive_packet(peer, lrecvbuffer, MAXPKTSIZE, 578 NULL, timeoutpacket); 579 if (n < 0) { 580 if (debug & DEBUG_SIMPLE) 581 tftp_log(LOG_DEBUG, "Aborting: %s", 582 rp_strerror(n)); 583 return; 584 } 585 if (rp->th_opcode != ACK) { 586 if (debug & DEBUG_SIMPLE) 587 tftp_log(LOG_DEBUG, 588 "Expected ACK, got %s on OACK", 589 packettype(rp->th_opcode)); 590 return; 591 } 592 } 593 } 594 595 if (logging) 596 tftp_log(LOG_INFO, "%s: read request for %s: %s", peername, 597 filename, errtomsg(ecode)); 598 599 if (ecode) { 600 /* 601 * Avoid storms of naks to a RRQ broadcast for a relative 602 * bootfile pathname from a diskless Sun. 603 */ 604 if (suppress_naks && *filename != '/' && ecode == ENOTFOUND) 605 exit(0); 606 send_error(peer, ecode); 607 exit(1); 608 } 609 tftp_xmitfile(peer, mode); 610 } 611 612 /* 613 * Find the next value for YYYYMMDD.nn when the file to be written should 614 * be unique. Due to the limitations of nn, we will fail if nn reaches 100. 615 * Besides, that is four updates per hour on a file, which is kind of 616 * execessive anyway. 617 */ 618 static int 619 find_next_name(char *filename, int *fd) 620 { 621 /* 622 * GCC "knows" that we might write all of yyyymmdd plus the static 623 * elemenents in the format into into newname and thus complains 624 * unless we reduce the size. This array is still too big, but since 625 * the format is user supplied, it's not clear what a better limit 626 * value would be and this is sufficent to silence the warnings. 627 */ 628 static const int suffix_len = strlen("..00"); 629 char yyyymmdd[MAXPATHLEN - suffix_len]; 630 char newname[MAXPATHLEN]; 631 int i, ret; 632 time_t tval; 633 size_t len, namelen; 634 struct tm lt; 635 636 /* Create the YYYYMMDD part of the filename */ 637 time(&tval); 638 lt = *localtime(&tval); 639 len = strftime(yyyymmdd, sizeof(yyyymmdd), newfile_format, <); 640 if (len == 0) { 641 syslog(LOG_WARNING, 642 "Filename suffix too long (%zu characters maximum)", 643 sizeof(yyyymmdd) - 1); 644 return (EACCESS); 645 } 646 647 /* Make sure the new filename is not too long */ 648 namelen = strlen(filename); 649 if (namelen >= sizeof(newname) - len - suffix_len) { 650 syslog(LOG_WARNING, 651 "Filename too long (%zu characters, %zu maximum)", 652 namelen, 653 sizeof(newname) - len - suffix_len - 1); 654 return (EACCESS); 655 } 656 657 /* Find the first file which doesn't exist */ 658 for (i = 0; i < 100; i++) { 659 ret = snprintf(newname, sizeof(newname), "%s.%s.%02d", 660 filename, yyyymmdd, i); 661 /* 662 * Size checked above so this can't happen, we'd use a 663 * (void) cast, but gcc intentionally ignores that if 664 * snprintf has __attribute__((warn_unused_result)). 665 */ 666 if (ret < 0 || (size_t)ret >= sizeof(newname)) 667 __unreachable(); 668 *fd = open(newname, O_WRONLY | O_CREAT | O_EXCL, 0666); 669 if (*fd > 0) 670 return 0; 671 } 672 673 return (EEXIST); 674 } 675 676 /* 677 * Validate file access. Since we 678 * have no uid or gid, for now require 679 * file to exist and be publicly 680 * readable/writable. 681 * If we were invoked with arguments 682 * from inetd then the file must also be 683 * in one of the given directory prefixes. 684 * Note also, full path name must be 685 * given as we have no login directory. 686 */ 687 int 688 validate_access(int peer, char **filep, int mode) 689 { 690 static char pathname[MAXPATHLEN]; 691 struct stat sb; 692 struct dirlist *dirp; 693 char *filename = *filep; 694 int err, fd; 695 696 /* 697 * Prevent tricksters from getting around the directory restrictions 698 */ 699 if (strncmp(filename, "../", 3) == 0 || 700 strstr(filename, "/../") != NULL) 701 return (EACCESS); 702 703 if (*filename == '/') { 704 /* 705 * Absolute file name: allow the request if it's in one of the 706 * approved locations. 707 */ 708 for (dirp = dirs; dirp->name != NULL; dirp++) { 709 if (dirp->len == 1) 710 /* Only "/" can have len 1 */ 711 break; 712 if (strncmp(filename, dirp->name, dirp->len) == 0 && 713 filename[dirp->len] == '/') 714 break; 715 } 716 /* If directory list is empty, allow access to any file */ 717 if (dirp->name == NULL && dirp != dirs) 718 return (EACCESS); 719 if (stat(filename, &sb) != 0) 720 return (errno == ENOENT ? ENOTFOUND : EACCESS); 721 if (!S_ISREG(sb.st_mode)) 722 return (ENOTFOUND); 723 if (mode == RRQ) { 724 if ((sb.st_mode & S_IROTH) == 0) 725 return (EACCESS); 726 } else { 727 if (check_woth && (sb.st_mode & S_IWOTH) == 0) 728 return (EACCESS); 729 } 730 } else { 731 /* 732 * Relative file name: search the approved locations for it. 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, &sb) != 0) 742 continue; 743 if (!S_ISREG(sb.st_mode)) 744 continue; 745 err = EACCESS; 746 if (mode == RRQ) { 747 if ((sb.st_mode & S_IROTH) == 0) 748 continue; 749 } else { 750 if (check_woth && (sb.st_mode & S_IWOTH) == 0) 751 continue; 752 } 753 break; 754 } 755 if (dirp->name != NULL) 756 *filep = filename = pathname; 757 else if (mode == RRQ) 758 return (err); 759 else if (err != ENOTFOUND || !create_new) 760 return (err); 761 } 762 763 /* 764 * This option is handled here because it (might) require(s) the 765 * size of the file. 766 */ 767 option_tsize(peer, NULL, mode, &sb); 768 769 if (mode == RRQ) { 770 fd = open(filename, O_RDONLY); 771 } else if (create_new) { 772 if (increase_name) { 773 err = find_next_name(filename, &fd); 774 if (err > 0) 775 return (err + 100); 776 } else { 777 fd = open(filename, 778 O_WRONLY | O_TRUNC | O_CREAT, 779 S_IRUSR | S_IWUSR | S_IRGRP | 780 S_IWGRP | S_IROTH | S_IWOTH ); 781 } 782 } else { 783 fd = open(filename, O_WRONLY | O_TRUNC); 784 } 785 if (fd < 0) 786 return (errno + 100); 787 file = fdopen(fd, mode == RRQ ? "r" : "w"); 788 if (file == NULL) { 789 close(fd); 790 return (errno + 100); 791 } 792 return (0); 793 } 794 795 static void 796 tftp_xmitfile(int peer, const char *mode) 797 { 798 uint16_t block; 799 time_t now; 800 struct tftp_stats ts; 801 802 memset(&ts, 0, sizeof(ts)); 803 now = time(NULL); 804 if (debug & DEBUG_SIMPLE) 805 tftp_log(LOG_DEBUG, "Transmitting file"); 806 807 read_init(0, file, mode); 808 block = 1; 809 tftp_send(peer, &block, &ts); 810 read_close(); 811 if (debug & DEBUG_SIMPLE) 812 tftp_log(LOG_INFO, "Sent %jd bytes in %jd seconds", 813 (intmax_t)ts.amount, (intmax_t)time(NULL) - now); 814 } 815 816 static void 817 tftp_recvfile(int peer, const char *mode) 818 { 819 uint16_t block; 820 struct timeval now1, now2; 821 struct tftp_stats ts; 822 823 gettimeofday(&now1, NULL); 824 if (debug & DEBUG_SIMPLE) 825 tftp_log(LOG_DEBUG, "Receiving file"); 826 827 write_init(0, file, mode); 828 829 block = 0; 830 tftp_receive(peer, &block, &ts, NULL, 0); 831 832 gettimeofday(&now2, NULL); 833 834 if (debug & DEBUG_SIMPLE) { 835 double f; 836 if (now1.tv_usec > now2.tv_usec) { 837 now2.tv_usec += 1000000; 838 now2.tv_sec--; 839 } 840 841 f = now2.tv_sec - now1.tv_sec + 842 (now2.tv_usec - now1.tv_usec) / 100000.0; 843 tftp_log(LOG_INFO, 844 "Download of %jd bytes in %d blocks completed after %0.1f seconds\n", 845 (intmax_t)ts.amount, block, f); 846 } 847 848 return; 849 } 850