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(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 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 * 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 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 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 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 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 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 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