1 /* $NetBSD: ftp.c,v 1.8 2024/02/02 22:19:05 christos Exp $ */ 2 /*- 3 * Copyright (c) 1998-2004 Dag-Erling Co�dan Sm�rgrav 4 * Copyright (c) 2008, 2009, 2010 Joerg Sonnenberger <joerg@NetBSD.org> 5 * 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 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $FreeBSD: ftp.c,v 1.101 2008/01/23 20:57:59 des Exp $ 31 */ 32 33 /* 34 * Portions of this code were taken from or based on ftpio.c: 35 * 36 * ---------------------------------------------------------------------------- 37 * "THE BEER-WARE LICENSE" (Revision 42): 38 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you 39 * can do whatever you want with this stuff. If we meet some day, and you think 40 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 41 * ---------------------------------------------------------------------------- 42 * 43 * Major Changelog: 44 * 45 * Dag-Erling Co�dan Sm�rgrav 46 * 9 Jun 1998 47 * 48 * Incorporated into libfetch 49 * 50 * Jordan K. Hubbard 51 * 17 Jan 1996 52 * 53 * Turned inside out. Now returns xfers as new file ids, not as a special 54 * `state' of FTP_t 55 * 56 * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $ 57 * 58 */ 59 60 #ifdef __linux__ 61 /* Keep this down to Linux, it can create surprises else where. */ 62 #define _GNU_SOURCE 63 #endif 64 65 #if HAVE_CONFIG_H 66 #include "config.h" 67 #endif 68 #ifndef NETBSD 69 #include <nbcompat.h> 70 #endif 71 72 #include <sys/types.h> 73 #include <sys/socket.h> 74 75 #include <netinet/in.h> 76 #include <arpa/inet.h> 77 78 #include <ctype.h> 79 #include <errno.h> 80 #include <fcntl.h> 81 #if defined(HAVE_INTTYPES_H) || defined(NETBSD) 82 #include <inttypes.h> 83 #endif 84 #include <stdarg.h> 85 #ifndef NETBSD 86 #include <nbcompat/netdb.h> 87 #include <nbcompat/stdio.h> 88 #else 89 #include <netdb.h> 90 #include <stdio.h> 91 #endif 92 #include <stdlib.h> 93 #include <string.h> 94 #include <time.h> 95 #include <unistd.h> 96 97 #include "fetch.h" 98 #include "common.h" 99 #include "ftperr.h" 100 101 #define FTP_ANONYMOUS_USER "anonymous" 102 103 #define FTP_CONNECTION_ALREADY_OPEN 125 104 #define FTP_OPEN_DATA_CONNECTION 150 105 #define FTP_OK 200 106 #define FTP_FILE_STATUS 213 107 #define FTP_SERVICE_READY 220 108 #define FTP_TRANSFER_COMPLETE 226 109 #define FTP_PASSIVE_MODE 227 110 #define FTP_LPASSIVE_MODE 228 111 #define FTP_EPASSIVE_MODE 229 112 #define FTP_LOGGED_IN 230 113 #define FTP_FILE_ACTION_OK 250 114 #define FTP_DIRECTORY_CREATED 257 /* multiple meanings */ 115 #define FTP_FILE_CREATED 257 /* multiple meanings */ 116 #define FTP_WORKING_DIRECTORY 257 /* multiple meanings */ 117 #define FTP_NEED_PASSWORD 331 118 #define FTP_NEED_ACCOUNT 332 119 #define FTP_FILE_OK 350 120 #define FTP_SYNTAX_ERROR 500 121 #define FTP_PROTOCOL_ERROR 999 122 123 #define isftpreply(foo) \ 124 (isdigit((unsigned char)foo[0]) && \ 125 isdigit((unsigned char)foo[1]) && \ 126 isdigit((unsigned char)foo[2]) && \ 127 (foo[3] == ' ' || foo[3] == '\0')) 128 #define isftpinfo(foo) \ 129 (isdigit((unsigned char)foo[0]) && \ 130 isdigit((unsigned char)foo[1]) && \ 131 isdigit((unsigned char)foo[2]) && \ 132 foo[3] == '-') 133 134 /* 135 * Translate IPv4 mapped IPv6 address to IPv4 address 136 */ 137 static void 138 unmappedaddr(struct sockaddr_in6 *sin6, socklen_t *len) 139 { 140 struct sockaddr_in *sin4; 141 uint32_t addr; 142 int port; 143 144 if (sin6->sin6_family != AF_INET6 || 145 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 146 return; 147 sin4 = (struct sockaddr_in *)(void *)sin6; 148 #ifdef s6_addr32 149 addr = sin6->sin6_addr.s6_addr32[3]; 150 #else 151 memcpy(&addr, &sin6->sin6_addr.s6_addr[12], sizeof(addr)); 152 #endif 153 port = sin6->sin6_port; 154 memset(sin4, 0, sizeof(struct sockaddr_in)); 155 sin4->sin_addr.s_addr = addr; 156 sin4->sin_port = port; 157 sin4->sin_family = AF_INET; 158 *len = sizeof(struct sockaddr_in); 159 #ifdef HAVE_SA_LEN 160 sin4->sin_len = sizeof(struct sockaddr_in); 161 #endif 162 } 163 164 /* 165 * Get server response 166 */ 167 static int 168 ftp_chkerr(conn_t *conn) 169 { 170 if (fetch_getln(conn) == -1) { 171 fetch_syserr(); 172 return (-1); 173 } 174 if (isftpinfo(conn->buf)) { 175 while (conn->buflen && !isftpreply(conn->buf)) { 176 if (fetch_getln(conn) == -1) { 177 fetch_syserr(); 178 return (-1); 179 } 180 } 181 } 182 183 while (conn->buflen && 184 isspace((unsigned char)conn->buf[conn->buflen - 1])) 185 conn->buflen--; 186 conn->buf[conn->buflen] = '\0'; 187 188 if (!isftpreply(conn->buf)) { 189 ftp_seterr(FTP_PROTOCOL_ERROR); 190 return (-1); 191 } 192 193 conn->err = (conn->buf[0] - '0') * 100 194 + (conn->buf[1] - '0') * 10 195 + (conn->buf[2] - '0'); 196 197 return (conn->err); 198 } 199 200 /* 201 * Send a command and check reply 202 */ 203 LIBFETCH_PRINTFLIKE(2, 3) 204 static int 205 ftp_cmd(conn_t *conn, const char *fmt, ...) 206 { 207 va_list ap; 208 size_t len; 209 char *msg; 210 ssize_t r; 211 212 va_start(ap, fmt); 213 len = vasprintf(&msg, fmt, ap); 214 va_end(ap); 215 216 if (msg == NULL) { 217 errno = ENOMEM; 218 fetch_syserr(); 219 return (-1); 220 } 221 222 r = fetch_write(conn, msg, len); 223 free(msg); 224 225 if (r == -1) { 226 fetch_syserr(); 227 return (-1); 228 } 229 230 return (ftp_chkerr(conn)); 231 } 232 233 /* 234 * Return a pointer to the filename part of a path 235 */ 236 static const char * 237 ftp_filename(const char *file, size_t *len, int *type, int subdir) 238 { 239 const char *s; 240 241 if ((s = strrchr(file, '/')) == NULL || subdir) 242 s = file; 243 else 244 s = s + 1; 245 *len = strlen(s); 246 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 247 *type = s[*len - 1]; 248 *len -= 7; 249 } else { 250 *type = '\0'; 251 } 252 return (s); 253 } 254 255 /* 256 * Get current working directory from the reply to a CWD, PWD or CDUP 257 * command. 258 */ 259 static int 260 ftp_pwd(conn_t *conn, char **pwd) 261 { 262 char *src, *dst, *end; 263 int q; 264 size_t len; 265 266 if (conn->err != FTP_WORKING_DIRECTORY && 267 conn->err != FTP_FILE_ACTION_OK) 268 return (FTP_PROTOCOL_ERROR); 269 end = conn->buf + conn->buflen; 270 src = conn->buf + 4; 271 if (src >= end || *src++ != '"') 272 return (FTP_PROTOCOL_ERROR); 273 len = end - src + 1; 274 *pwd = malloc(len); 275 if (*pwd == NULL) 276 return (FTP_PROTOCOL_ERROR); 277 for (q = 0, dst = *pwd; src < end; ++src) { 278 if (!q && *src == '"') 279 q = 1; 280 else if (q && *src != '"') 281 break; 282 else if (q) 283 *dst++ = '"', q = 0; 284 else 285 *dst++ = *src; 286 } 287 *dst = '\0'; 288 if (**pwd != '/') { 289 free(*pwd); 290 *pwd = NULL; 291 return (FTP_PROTOCOL_ERROR); 292 } 293 return (FTP_OK); 294 } 295 296 /* 297 * Change working directory to the directory that contains the specified 298 * file. 299 */ 300 static int 301 ftp_cwd(conn_t *conn, const char *path, int subdir) 302 { 303 const char *beg, *end; 304 char *pwd, *dst; 305 int e; 306 size_t i, len; 307 308 if (*path != '/') { 309 ftp_seterr(501); 310 return (-1); 311 } 312 ++path; 313 314 /* Simple case: still in the home directory and no directory change. */ 315 if (conn->ftp_home == NULL && strchr(path, '/') == NULL && 316 (!subdir || *path == '\0')) 317 return 0; 318 319 if ((e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || 320 (e = ftp_pwd(conn, &pwd)) != FTP_OK) { 321 ftp_seterr(e); 322 return (-1); 323 } 324 if (conn->ftp_home == NULL && (conn->ftp_home = strdup(pwd)) == NULL) { 325 fetch_syserr(); 326 free(pwd); 327 return (-1); 328 } 329 if (*path == '/') { 330 while (path[1] == '/') 331 ++path; 332 dst = strdup(path); 333 } else if (strcmp(conn->ftp_home, "/") == 0) { 334 dst = strdup(path - 1); 335 } else { 336 if (asprintf(&dst, "%s/%s", conn->ftp_home, path) == -1) 337 dst = NULL; 338 } 339 if (dst == NULL) { 340 fetch_syserr(); 341 free(pwd); 342 return (-1); 343 } 344 345 if (subdir) 346 end = dst + strlen(dst); 347 else 348 end = strrchr(dst, '/'); 349 350 for (;;) { 351 len = strlen(pwd); 352 353 /* Look for a common prefix between PWD and dir to fetch. */ 354 for (i = 0; i <= len && i <= (size_t)(end - dst); ++i) 355 if (pwd[i] != dst[i]) 356 break; 357 /* Keep going up a dir until we have a matching prefix. */ 358 if (strcmp(pwd, "/") == 0) 359 break; 360 if (pwd[i] == '\0' && (dst[i - 1] == '/' || dst[i] == '/')) 361 break; 362 free(pwd); 363 if ((e = ftp_cmd(conn, "CDUP\r\n")) != FTP_FILE_ACTION_OK || 364 (e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || 365 (e = ftp_pwd(conn, &pwd)) != FTP_OK) { 366 ftp_seterr(e); 367 free(dst); 368 return (-1); 369 } 370 } 371 free(pwd); 372 373 #ifdef FTP_COMBINE_CWDS 374 /* Skip leading slashes, even "////". */ 375 for (beg = dst + i; beg < end && *beg == '/'; ++beg, ++i) 376 /* nothing */ ; 377 378 /* If there is no trailing dir, we're already there. */ 379 if (beg >= end) { 380 free(dst); 381 return (0); 382 } 383 384 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 385 e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(end - beg), beg); 386 if (e == FTP_FILE_ACTION_OK) { 387 free(dst); 388 return (0); 389 } 390 #endif /* FTP_COMBINE_CWDS */ 391 392 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 393 for (beg = dst + i; beg < end; beg = dst + i + 1) { 394 while (*beg == '/') 395 ++beg, ++i; 396 for (++i; dst + i < end && dst[i] != '/'; ++i) 397 /* nothing */ ; 398 e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(dst + i - beg), beg); 399 if (e != FTP_FILE_ACTION_OK) { 400 free(dst); 401 ftp_seterr(e); 402 return (-1); 403 } 404 } 405 free(dst); 406 return (0); 407 } 408 409 /* 410 * Set transfer mode and data type 411 */ 412 static int 413 ftp_mode_type(conn_t *conn, int mode, int type) 414 { 415 int e; 416 417 switch (mode) { 418 case 0: 419 case 's': 420 mode = 'S'; 421 /*FALLTHROUGH*/ 422 case 'S': 423 break; 424 default: 425 return (FTP_PROTOCOL_ERROR); 426 } 427 if ((e = ftp_cmd(conn, "MODE %c\r\n", mode)) != FTP_OK) { 428 if (mode == 'S') { 429 /* 430 * Stream mode is supposed to be the default - so 431 * much so that some servers not only do not 432 * support any other mode, but do not support the 433 * MODE command at all. 434 * 435 * If "MODE S" fails, it is unlikely that we 436 * previously succeeded in setting a different 437 * mode. Therefore, we simply hope that the 438 * server is already in the correct mode, and 439 * silently ignore the failure. 440 */ 441 } else { 442 return (e); 443 } 444 } 445 446 switch (type) { 447 case 0: 448 case 'i': 449 type = 'I'; 450 /*FALLTHROUGH*/ 451 case 'I': 452 break; 453 case 'a': 454 type = 'A'; 455 /*FALLTHROUGH*/ 456 case 'A': 457 break; 458 case 'd': 459 type = 'D'; 460 /*FALLTHROUGH*/ 461 case 'D': 462 /* can't handle yet */ 463 default: 464 return (FTP_PROTOCOL_ERROR); 465 } 466 if ((e = ftp_cmd(conn, "TYPE %c\r\n", type)) != FTP_OK) 467 return (e); 468 469 return (FTP_OK); 470 } 471 472 /* 473 * Request and parse file stats 474 */ 475 static int 476 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 477 { 478 char *ln; 479 const char *filename; 480 size_t filenamelen; 481 int type; 482 struct tm tm; 483 time_t t; 484 int e; 485 486 us->size = -1; 487 us->atime = us->mtime = 0; 488 489 filename = ftp_filename(file, &filenamelen, &type, 0); 490 491 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 492 ftp_seterr(e); 493 return (-1); 494 } 495 496 e = ftp_cmd(conn, "SIZE %.*s\r\n", (int)filenamelen, filename); 497 if (e != FTP_FILE_STATUS) { 498 ftp_seterr(e); 499 return (-1); 500 } 501 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 502 /* nothing */ ; 503 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 504 us->size = us->size * 10 + *ln - '0'; 505 if (*ln && !isspace((unsigned char)*ln)) { 506 ftp_seterr(FTP_PROTOCOL_ERROR); 507 us->size = -1; 508 return (-1); 509 } 510 if (us->size == 0) 511 us->size = -1; 512 513 e = ftp_cmd(conn, "MDTM %.*s\r\n", (int)filenamelen, filename); 514 if (e != FTP_FILE_STATUS) { 515 ftp_seterr(e); 516 return (-1); 517 } 518 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 519 /* nothing */ ; 520 switch (strspn(ln, "0123456789")) { 521 case 14: 522 break; 523 case 15: 524 ln++; 525 ln[0] = '2'; 526 ln[1] = '0'; 527 break; 528 default: 529 ftp_seterr(FTP_PROTOCOL_ERROR); 530 return (-1); 531 } 532 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 533 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 534 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 535 ftp_seterr(FTP_PROTOCOL_ERROR); 536 return (-1); 537 } 538 tm.tm_mon--; 539 tm.tm_year -= 1900; 540 tm.tm_isdst = -1; 541 t = timegm(&tm); 542 if (t == (time_t)-1) 543 t = time(NULL); 544 us->mtime = t; 545 us->atime = t; 546 547 return (0); 548 } 549 550 /* 551 * I/O functions for FTP 552 */ 553 struct ftpio { 554 conn_t *cconn; /* Control connection */ 555 conn_t *dconn; /* Data connection */ 556 int dir; /* Direction */ 557 int eof; /* EOF reached */ 558 int err; /* Error code */ 559 }; 560 561 static ssize_t ftp_readfn(void *, void *, size_t); 562 static ssize_t ftp_writefn(void *, const void *, size_t); 563 static void ftp_closefn(void *); 564 565 static ssize_t 566 ftp_readfn(void *v, void *buf, size_t len) 567 { 568 struct ftpio *io; 569 ssize_t r; 570 571 io = (struct ftpio *)v; 572 if (io == NULL) { 573 errno = EBADF; 574 return (-1); 575 } 576 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 577 errno = EBADF; 578 return (-1); 579 } 580 if (io->err) { 581 errno = io->err; 582 return (-1); 583 } 584 if (io->eof) 585 return (0); 586 r = fetch_read(io->dconn, buf, len); 587 if (r > 0) 588 return (r); 589 if (r == 0) { 590 io->eof = 1; 591 return (0); 592 } 593 if (errno != EINTR) 594 io->err = errno; 595 return (-1); 596 } 597 598 static ssize_t 599 ftp_writefn(void *v, const void *buf, size_t len) 600 { 601 struct ftpio *io; 602 ssize_t w; 603 604 io = (struct ftpio *)v; 605 if (io == NULL) { 606 errno = EBADF; 607 return (-1); 608 } 609 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 610 errno = EBADF; 611 return (-1); 612 } 613 if (io->err) { 614 errno = io->err; 615 return (-1); 616 } 617 w = fetch_write(io->dconn, buf, len); 618 if (w >= 0) 619 return (w); 620 if (errno != EINTR) 621 io->err = errno; 622 return (-1); 623 } 624 625 static int 626 ftp_disconnect(conn_t *conn) 627 { 628 ftp_cmd(conn, "QUIT\r\n"); 629 return fetch_close(conn); 630 } 631 632 static void 633 ftp_closefn(void *v) 634 { 635 struct ftpio *io; 636 637 io = (struct ftpio *)v; 638 if (io == NULL) { 639 errno = EBADF; 640 return; 641 } 642 if (io->dir == -1) 643 return; 644 if (io->cconn == NULL || io->dconn == NULL) { 645 errno = EBADF; 646 return; 647 } 648 fetch_close(io->dconn); 649 io->dconn = NULL; 650 io->dir = -1; 651 (void)ftp_chkerr(io->cconn); 652 fetch_cache_put(io->cconn, ftp_disconnect); 653 free(io); 654 return; 655 } 656 657 static fetchIO * 658 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 659 { 660 struct ftpio *io; 661 fetchIO *f; 662 663 if (cconn == NULL || dconn == NULL) 664 return (NULL); 665 if ((io = malloc(sizeof(*io))) == NULL) 666 return (NULL); 667 io->cconn = cconn; 668 io->dconn = dconn; 669 io->dir = mode; 670 io->eof = io->err = 0; 671 f = fetchIO_unopen(io, ftp_readfn, ftp_writefn, ftp_closefn); 672 if (f == NULL) 673 free(io); 674 return (f); 675 } 676 677 /* 678 * Transfer file 679 */ 680 static fetchIO * 681 ftp_transfer(conn_t *conn, const char *oper, const char *file, const char *op_arg, 682 int mode, off_t offset, const char *flags) 683 { 684 union anonymous { 685 struct sockaddr_storage ss; 686 struct sockaddr sa; 687 struct sockaddr_in6 sin6; 688 struct sockaddr_in sin4; 689 } u; 690 const char *bindaddr; 691 const char *filename; 692 size_t filenamelen; 693 int type; 694 int low, pasv, verbose; 695 int e, sd = -1; 696 socklen_t l; 697 char *s; 698 fetchIO *df; 699 700 /* check flags */ 701 low = CHECK_FLAG('l'); 702 pasv = !CHECK_FLAG('a'); 703 verbose = CHECK_FLAG('v'); 704 705 /* passive mode */ 706 if (!pasv) 707 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 708 strncasecmp(s, "no", 2) != 0); 709 710 /* isolate filename */ 711 filename = ftp_filename(file, &filenamelen, &type, op_arg != NULL); 712 713 /* set transfer mode and data type */ 714 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 715 goto ouch; 716 717 /* find our own address, bind, and listen */ 718 l = sizeof(u.ss); 719 if (getsockname(conn->sd, &u.sa, &l) == -1) 720 goto sysouch; 721 if (u.ss.ss_family == AF_INET6) 722 unmappedaddr(&u.sin6, &l); 723 724 retry_mode: 725 726 /* open data socket */ 727 if ((sd = socket(u.ss.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 728 fetch_syserr(); 729 return (NULL); 730 } 731 732 if (pasv) { 733 unsigned char addr[64]; 734 char *ln, *p; 735 unsigned int i; 736 int port; 737 738 /* send PASV command */ 739 if (verbose) 740 fetch_info("setting passive mode"); 741 switch (u.ss.ss_family) { 742 case AF_INET: 743 if ((e = ftp_cmd(conn, "PASV\r\n")) != FTP_PASSIVE_MODE) 744 goto ouch; 745 break; 746 case AF_INET6: 747 if ((e = ftp_cmd(conn, "EPSV\r\n")) != FTP_EPASSIVE_MODE) { 748 if (e == -1) 749 goto ouch; 750 if ((e = ftp_cmd(conn, "LPSV\r\n")) != 751 FTP_LPASSIVE_MODE) 752 goto ouch; 753 } 754 break; 755 default: 756 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 757 goto ouch; 758 } 759 760 /* 761 * Find address and port number. The reply to the PASV command 762 * is IMHO the one and only weak point in the FTP protocol. 763 */ 764 ln = conn->buf; 765 switch (e) { 766 case FTP_PASSIVE_MODE: 767 case FTP_LPASSIVE_MODE: 768 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 769 /* nothing */ ; 770 if (!*p) { 771 e = FTP_PROTOCOL_ERROR; 772 goto ouch; 773 } 774 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 775 for (i = 0; *p && i < l; i++, p++) 776 addr[i] = (unsigned char)strtol(p, &p, 10); 777 if (i < l) { 778 e = FTP_PROTOCOL_ERROR; 779 goto ouch; 780 } 781 break; 782 case FTP_EPASSIVE_MODE: 783 for (p = ln + 3; *p && *p != '('; p++) 784 /* nothing */ ; 785 if (!*p) { 786 e = FTP_PROTOCOL_ERROR; 787 goto ouch; 788 } 789 ++p; 790 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 791 &port, &addr[3]) != 5 || 792 addr[0] != addr[1] || 793 addr[0] != addr[2] || addr[0] != addr[3]) { 794 e = FTP_PROTOCOL_ERROR; 795 goto ouch; 796 } 797 break; 798 case FTP_SYNTAX_ERROR: 799 if (verbose) 800 fetch_info("passive mode failed"); 801 /* Close socket and retry with passive mode. */ 802 pasv = 0; 803 close(sd); 804 sd = -1; 805 goto retry_mode; 806 } 807 808 /* seek to required offset */ 809 if (offset) 810 if (ftp_cmd(conn, "REST %lu\r\n", (unsigned long)offset) != FTP_FILE_OK) 811 goto sysouch; 812 813 /* construct sockaddr for data socket */ 814 l = sizeof(u.ss); 815 if (getpeername(conn->sd, &u.sa, &l) == -1) 816 goto sysouch; 817 if (u.ss.ss_family == AF_INET6) 818 unmappedaddr(&u.sin6, &l); 819 switch (u.ss.ss_family) { 820 case AF_INET6: 821 if (e == FTP_EPASSIVE_MODE) 822 u.sin6.sin6_port = htons(port); 823 else { 824 memcpy(&u.sin6.sin6_addr, addr + 2, 16); 825 memcpy(&u.sin6.sin6_port, addr + 19, 2); 826 } 827 break; 828 case AF_INET: 829 if (e == FTP_EPASSIVE_MODE) 830 u.sin4.sin_port = htons(port); 831 else { 832 memcpy(&u.sin4.sin_addr, addr, 4); 833 memcpy(&u.sin4.sin_port, addr + 4, 2); 834 } 835 break; 836 default: 837 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 838 break; 839 } 840 841 /* connect to data port */ 842 if (verbose) 843 fetch_info("opening data connection"); 844 bindaddr = getenv("FETCH_BIND_ADDRESS"); 845 if (bindaddr != NULL && *bindaddr != '\0' && 846 fetch_bind(sd, u.ss.ss_family, bindaddr) != 0) 847 goto sysouch; 848 if (connect(sd, &u.sa, l) == -1) 849 goto sysouch; 850 851 /* make the server initiate the transfer */ 852 if (verbose) 853 fetch_info("initiating transfer"); 854 if (op_arg) 855 e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); 856 else 857 e = ftp_cmd(conn, "%s %.*s\r\n", oper, 858 (int)filenamelen, filename); 859 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 860 goto ouch; 861 862 } else { 863 uint32_t a; 864 uint16_t p; 865 #if defined(IPV6_PORTRANGE) || defined(IP_PORTRANGE) 866 int arg; 867 #endif 868 int d; 869 char hname[INET6_ADDRSTRLEN]; 870 871 switch (u.ss.ss_family) { 872 case AF_INET6: 873 u.sin6.sin6_port = 0; 874 #ifdef IPV6_PORTRANGE 875 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 876 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 877 &arg, (socklen_t)sizeof(arg)) == -1) 878 goto sysouch; 879 #endif 880 break; 881 case AF_INET: 882 u.sin4.sin_port = 0; 883 #ifdef IP_PORTRANGE 884 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 885 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 886 &arg, (socklen_t)sizeof(arg)) == -1) 887 goto sysouch; 888 #endif 889 break; 890 } 891 if (verbose) 892 fetch_info("binding data socket"); 893 if (bind(sd, &u.sa, l) == -1) 894 goto sysouch; 895 if (listen(sd, 1) == -1) 896 goto sysouch; 897 898 /* find what port we're on and tell the server */ 899 if (getsockname(sd, &u.sa, &l) == -1) 900 goto sysouch; 901 switch (u.ss.ss_family) { 902 case AF_INET: 903 a = ntohl(u.sin4.sin_addr.s_addr); 904 p = ntohs(u.sin4.sin_port); 905 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d\r\n", 906 (a >> 24) & 0xff, (a >> 16) & 0xff, 907 (a >> 8) & 0xff, a & 0xff, 908 ((unsigned int)p >> 8) & 0xff, p & 0xff); 909 break; 910 case AF_INET6: 911 e = -1; 912 u.sin6.sin6_scope_id = 0; 913 if (getnameinfo(&u.sa, l, 914 hname, (socklen_t)sizeof(hname), 915 NULL, 0, NI_NUMERICHOST) == 0) { 916 e = ftp_cmd(conn, "EPRT |%d|%s|%d|\r\n", 2, hname, 917 htons(u.sin6.sin6_port)); 918 if (e == -1) 919 goto ouch; 920 } 921 if (e != FTP_OK) { 922 uint8_t aa[sizeof(u.sin6.sin6_addr)]; 923 memcpy(aa, &u.sin6.sin6_addr, sizeof(aa)); 924 p = ntohs(u.sin6.sin6_port); 925 e = ftp_cmd(conn, 926 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d\r\n", 927 6, 16, 928 aa[ 0], aa[ 1], aa[ 2], aa[ 3], 929 aa[ 4], aa[ 5], aa[ 6], aa[ 7], 930 aa[ 8], aa[ 9], aa[10], aa[11], 931 aa[12], aa[13], aa[14], aa[15], 932 2, 933 ((unsigned int)p >> 8) & 0xff, p & 0xff); 934 } 935 break; 936 default: 937 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 938 goto ouch; 939 } 940 if (e != FTP_OK) 941 goto ouch; 942 943 /* seek to required offset */ 944 if (offset) 945 if (ftp_cmd(conn, "REST %llu\r\n", (unsigned long long)offset) != FTP_FILE_OK) 946 goto sysouch; 947 948 /* make the server initiate the transfer */ 949 if (verbose) 950 fetch_info("initiating transfer"); 951 if (op_arg) 952 e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); 953 else 954 e = ftp_cmd(conn, "%s %.*s\r\n", oper, 955 (int)filenamelen, filename); 956 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 957 goto ouch; 958 959 /* accept the incoming connection and go to town */ 960 if ((d = accept(sd, NULL, NULL)) == -1) 961 goto sysouch; 962 close(sd); 963 sd = d; 964 } 965 966 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 967 goto sysouch; 968 return (df); 969 970 sysouch: 971 fetch_syserr(); 972 if (sd >= 0) 973 close(sd); 974 return (NULL); 975 976 ouch: 977 if (e != -1) 978 ftp_seterr(e); 979 if (sd >= 0) 980 close(sd); 981 return (NULL); 982 } 983 984 /* 985 * Authenticate 986 */ 987 static int 988 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 989 { 990 const char *user, *pwd, *login_name; 991 char pbuf[URL_USERLEN + 1 + URL_HOSTLEN + 1]; 992 int e, len; 993 994 /* XXX FTP_AUTH, and maybe .netrc */ 995 996 /* send user name and password */ 997 if (url->user[0] == '\0') 998 fetch_netrc_auth(url); 999 user = url->user; 1000 if (*user == '\0') 1001 user = getenv("FTP_LOGIN"); 1002 if (user == NULL || *user == '\0') 1003 user = FTP_ANONYMOUS_USER; 1004 if (purl && url->port == fetch_default_port(url->scheme)) 1005 e = ftp_cmd(conn, "USER %s@%s\r\n", user, url->host); 1006 else if (purl) 1007 e = ftp_cmd(conn, "USER %s@%s@%d\r\n", user, url->host, url->port); 1008 else 1009 e = ftp_cmd(conn, "USER %s\r\n", user); 1010 1011 /* did the server request a password? */ 1012 if (e == FTP_NEED_PASSWORD) { 1013 pwd = url->pwd; 1014 if (*pwd == '\0') 1015 pwd = getenv("FTP_PASSWORD"); 1016 if (pwd == NULL || *pwd == '\0') { 1017 if ((login_name = getlogin()) == 0) 1018 login_name = FTP_ANONYMOUS_USER; 1019 if ((len = snprintf(pbuf, URL_USERLEN + 2, "%s@", login_name)) < 0) 1020 len = 0; 1021 else if (len > URL_USERLEN + 1) 1022 len = URL_USERLEN + 1; 1023 gethostname(pbuf + len, sizeof(pbuf) - len); 1024 /* MAXHOSTNAMELEN can differ from URL_HOSTLEN + 1 */ 1025 pbuf[sizeof(pbuf) - 1] = '\0'; 1026 pwd = pbuf; 1027 } 1028 e = ftp_cmd(conn, "PASS %s\r\n", pwd); 1029 } 1030 1031 return (e); 1032 } 1033 1034 /* 1035 * Log on to FTP server 1036 */ 1037 static conn_t * 1038 ftp_connect(struct url *url, struct url *purl, const char *flags) 1039 { 1040 conn_t *conn; 1041 int e, direct, verbose; 1042 #ifdef INET6 1043 int af = AF_UNSPEC; 1044 #else 1045 int af = AF_INET; 1046 #endif 1047 1048 direct = CHECK_FLAG('d'); 1049 verbose = CHECK_FLAG('v'); 1050 if (CHECK_FLAG('4')) 1051 af = AF_INET; 1052 else if (CHECK_FLAG('6')) 1053 af = AF_INET6; 1054 1055 if (direct) 1056 purl = NULL; 1057 1058 /* check for proxy */ 1059 if (purl) { 1060 /* XXX proxy authentication! */ 1061 /* XXX connetion caching */ 1062 if (!purl->port) 1063 purl->port = fetch_default_port(purl->scheme); 1064 1065 conn = fetch_connect(purl, af, verbose); 1066 } else { 1067 /* no proxy, go straight to target */ 1068 if (!url->port) 1069 url->port = fetch_default_port(url->scheme); 1070 1071 while ((conn = fetch_cache_get(url, af)) != NULL) { 1072 e = ftp_cmd(conn, "NOOP\r\n"); 1073 if (e == FTP_OK) 1074 return conn; 1075 fetch_close(conn); 1076 } 1077 conn = fetch_connect(url, af, verbose); 1078 purl = NULL; 1079 } 1080 1081 /* check connection */ 1082 if (conn == NULL) 1083 /* fetch_connect() has already set an error code */ 1084 return (NULL); 1085 1086 /* expect welcome message */ 1087 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 1088 goto fouch; 1089 1090 /* authenticate */ 1091 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 1092 goto fouch; 1093 1094 /* TODO: Request extended features supported, if any (RFC 3659). */ 1095 1096 /* done */ 1097 return (conn); 1098 1099 fouch: 1100 if (e != -1) 1101 ftp_seterr(e); 1102 fetch_close(conn); 1103 return (NULL); 1104 } 1105 1106 /* 1107 * Check the proxy settings 1108 */ 1109 static struct url * 1110 ftp_get_proxy(struct url * url, const char *flags) 1111 { 1112 struct url *purl; 1113 char *p, *fp, *FP, *hp, *HP; 1114 1115 if (flags != NULL && strchr(flags, 'd') != NULL) 1116 return NULL; 1117 if (fetch_no_proxy_match(url->host)) 1118 return NULL; 1119 1120 FP = getenv("FTP_PROXY"); 1121 fp = getenv("ftp_proxy"); 1122 HP = getenv("HTTP_PROXY"); 1123 hp = getenv("http_proxy"); 1124 1125 if ((((p = FP) || (p = fp) || (p = HP) || (p = hp))) && 1126 *p && (purl = fetchParseURL(p)) != NULL) { 1127 if (!*purl->scheme) { 1128 if (fp || FP) 1129 strcpy(purl->scheme, SCHEME_FTP); 1130 else 1131 strcpy(purl->scheme, SCHEME_HTTP); 1132 } 1133 if (!purl->port) 1134 purl->port = fetch_default_proxy_port(purl->scheme); 1135 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1136 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1137 return purl; 1138 fetchFreeURL(purl); 1139 } 1140 return NULL; 1141 } 1142 1143 /* 1144 * Process an FTP request 1145 */ 1146 fetchIO * 1147 ftp_request(struct url *url, const char *op, const char *op_arg, 1148 struct url_stat *us, struct url *purl, const char *flags) 1149 { 1150 fetchIO *f; 1151 char *path; 1152 conn_t *conn; 1153 int if_modified_since, oflag; 1154 struct url_stat local_us; 1155 1156 /* check if we should use HTTP instead */ 1157 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1158 if (strcmp(op, "STAT") == 0) 1159 return (http_request(url, "HEAD", us, purl, flags)); 1160 else if (strcmp(op, "RETR") == 0) 1161 return (http_request(url, "GET", us, purl, flags)); 1162 /* 1163 * Our HTTP code doesn't support PUT requests yet, so try 1164 * a direct connection. 1165 */ 1166 } 1167 1168 /* connect to server */ 1169 conn = ftp_connect(url, purl, flags); 1170 if (purl) 1171 fetchFreeURL(purl); 1172 if (conn == NULL) 1173 return (NULL); 1174 1175 if ((path = fetchUnquotePath(url)) == NULL) { 1176 fetch_close(conn); 1177 fetch_syserr(); 1178 return NULL; 1179 } 1180 1181 /* change directory */ 1182 if (ftp_cwd(conn, path, op_arg != NULL) == -1) { 1183 fetch_close(conn); 1184 free(path); 1185 return (NULL); 1186 } 1187 1188 if_modified_since = CHECK_FLAG('i'); 1189 if (if_modified_since && us == NULL) 1190 us = &local_us; 1191 1192 /* stat file */ 1193 if (us && ftp_stat(conn, path, us) == -1 1194 && fetchLastErrCode != FETCH_PROTO 1195 && fetchLastErrCode != FETCH_UNAVAIL) { 1196 fetch_close(conn); 1197 free(path); 1198 return (NULL); 1199 } 1200 1201 if (if_modified_since && url->last_modified > 0 && 1202 url->last_modified >= us->mtime) { 1203 fetch_cache_put(conn, ftp_disconnect); 1204 free(path); 1205 fetchLastErrCode = FETCH_UNCHANGED; 1206 snprintf(fetchLastErrString, MAXERRSTRING, "Unchanged"); 1207 return NULL; 1208 } 1209 1210 /* just a stat */ 1211 if (strcmp(op, "STAT") == 0) { 1212 fetch_cache_put(conn, ftp_disconnect); 1213 free(path); 1214 return fetchIO_unopen(NULL, NULL, NULL, NULL); 1215 } 1216 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1217 oflag = O_WRONLY; 1218 else 1219 oflag = O_RDONLY; 1220 1221 /* initiate the transfer */ 1222 f = (ftp_transfer(conn, op, path, op_arg, oflag, url->offset, flags)); 1223 free(path); 1224 return f; 1225 } 1226 1227 /* 1228 * Get and stat file 1229 */ 1230 fetchIO * 1231 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1232 { 1233 return (ftp_request(url, "RETR", NULL, us, ftp_get_proxy(url, flags), flags)); 1234 } 1235 1236 /* 1237 * Get file 1238 */ 1239 fetchIO * 1240 fetchGetFTP(struct url *url, const char *flags) 1241 { 1242 return (fetchXGetFTP(url, NULL, flags)); 1243 } 1244 1245 /* 1246 * Put file 1247 */ 1248 fetchIO * 1249 fetchPutFTP(struct url *url, const char *flags) 1250 { 1251 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, NULL, 1252 ftp_get_proxy(url, flags), flags)); 1253 } 1254 1255 /* 1256 * Get file stats 1257 */ 1258 int 1259 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1260 { 1261 fetchIO *f; 1262 1263 f = ftp_request(url, "STAT", NULL, us, ftp_get_proxy(url, flags), flags); 1264 if (f == NULL) 1265 return (-1); 1266 fetchIO_close(f); 1267 return (0); 1268 } 1269 1270 /* 1271 * List a directory 1272 */ 1273 int 1274 fetchListFTP(struct url_list *ue, struct url *url, const char *pattern, const char *flags) 1275 { 1276 fetchIO *f; 1277 char buf[2 * PATH_MAX], *eol, *eos; 1278 ssize_t len; 1279 size_t cur_off; 1280 int ret; 1281 1282 /* XXX What about proxies? */ 1283 if (pattern == NULL || strcmp(pattern, "*") == 0) 1284 pattern = ""; 1285 f = ftp_request(url, "NLST", pattern, NULL, ftp_get_proxy(url, flags), flags); 1286 if (f == NULL) 1287 return -1; 1288 1289 cur_off = 0; 1290 ret = 0; 1291 1292 while ((len = fetchIO_read(f, buf + cur_off, sizeof(buf) - cur_off)) > 0) { 1293 cur_off += len; 1294 while ((eol = memchr(buf, '\n', cur_off)) != NULL) { 1295 if (len == eol - buf) 1296 break; 1297 if (eol != buf) { 1298 if (eol[-1] == '\r') 1299 eos = eol - 1; 1300 else 1301 eos = eol; 1302 *eos = '\0'; 1303 ret = fetch_add_entry(ue, url, buf, 0); 1304 if (ret) 1305 break; 1306 cur_off -= eol - buf + 1; 1307 memmove(buf, eol + 1, cur_off); 1308 } 1309 } 1310 if (ret) 1311 break; 1312 } 1313 if (cur_off != 0 || len < 0) { 1314 /* Not RFC conform, bail out. */ 1315 fetchIO_close(f); 1316 return -1; 1317 } 1318 fetchIO_close(f); 1319 return ret; 1320 } 1321