1 /* $NetBSD: ftp.c,v 1.7 2014/01/07 02:13:00 joerg 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 void *addrp; 142 uint32_t addr; 143 int port; 144 145 if (sin6->sin6_family != AF_INET6 || 146 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 147 return; 148 sin4 = (struct sockaddr_in *)(void *)sin6; 149 addrp = &sin6->sin6_addr.s6_addr[12]; 150 addr = *(uint32_t *)addrp; 151 port = sin6->sin6_port; 152 memset(sin4, 0, sizeof(struct sockaddr_in)); 153 sin4->sin_addr.s_addr = addr; 154 sin4->sin_port = port; 155 sin4->sin_family = AF_INET; 156 *len = sizeof(struct sockaddr_in); 157 #ifdef HAVE_SA_LEN 158 sin4->sin_len = sizeof(struct sockaddr_in); 159 #endif 160 } 161 162 /* 163 * Get server response 164 */ 165 static int 166 ftp_chkerr(conn_t *conn) 167 { 168 if (fetch_getln(conn) == -1) { 169 fetch_syserr(); 170 return (-1); 171 } 172 if (isftpinfo(conn->buf)) { 173 while (conn->buflen && !isftpreply(conn->buf)) { 174 if (fetch_getln(conn) == -1) { 175 fetch_syserr(); 176 return (-1); 177 } 178 } 179 } 180 181 while (conn->buflen && 182 isspace((unsigned char)conn->buf[conn->buflen - 1])) 183 conn->buflen--; 184 conn->buf[conn->buflen] = '\0'; 185 186 if (!isftpreply(conn->buf)) { 187 ftp_seterr(FTP_PROTOCOL_ERROR); 188 return (-1); 189 } 190 191 conn->err = (conn->buf[0] - '0') * 100 192 + (conn->buf[1] - '0') * 10 193 + (conn->buf[2] - '0'); 194 195 return (conn->err); 196 } 197 198 /* 199 * Send a command and check reply 200 */ 201 __printflike(2, 3) 202 static int 203 ftp_cmd(conn_t *conn, const char *fmt, ...) 204 { 205 va_list ap; 206 size_t len; 207 char *msg; 208 ssize_t r; 209 210 va_start(ap, fmt); 211 len = vasprintf(&msg, fmt, ap); 212 va_end(ap); 213 214 if (msg == NULL) { 215 errno = ENOMEM; 216 fetch_syserr(); 217 return (-1); 218 } 219 220 r = fetch_write(conn, msg, len); 221 free(msg); 222 223 if (r == -1) { 224 fetch_syserr(); 225 return (-1); 226 } 227 228 return (ftp_chkerr(conn)); 229 } 230 231 /* 232 * Return a pointer to the filename part of a path 233 */ 234 static const char * 235 ftp_filename(const char *file, size_t *len, int *type, int subdir) 236 { 237 const char *s; 238 239 if ((s = strrchr(file, '/')) == NULL || subdir) 240 s = file; 241 else 242 s = s + 1; 243 *len = strlen(s); 244 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 245 *type = s[*len - 1]; 246 *len -= 7; 247 } else { 248 *type = '\0'; 249 } 250 return (s); 251 } 252 253 /* 254 * Get current working directory from the reply to a CWD, PWD or CDUP 255 * command. 256 */ 257 static int 258 ftp_pwd(conn_t *conn, char **pwd) 259 { 260 char *src, *dst, *end; 261 int q; 262 size_t len; 263 264 if (conn->err != FTP_WORKING_DIRECTORY && 265 conn->err != FTP_FILE_ACTION_OK) 266 return (FTP_PROTOCOL_ERROR); 267 end = conn->buf + conn->buflen; 268 src = conn->buf + 4; 269 if (src >= end || *src++ != '"') 270 return (FTP_PROTOCOL_ERROR); 271 len = end - src + 1; 272 *pwd = malloc(len); 273 if (*pwd == NULL) 274 return (FTP_PROTOCOL_ERROR); 275 for (q = 0, dst = *pwd; src < end; ++src) { 276 if (!q && *src == '"') 277 q = 1; 278 else if (q && *src != '"') 279 break; 280 else if (q) 281 *dst++ = '"', q = 0; 282 else 283 *dst++ = *src; 284 } 285 *dst = '\0'; 286 if (**pwd != '/') { 287 free(*pwd); 288 *pwd = NULL; 289 return (FTP_PROTOCOL_ERROR); 290 } 291 return (FTP_OK); 292 } 293 294 /* 295 * Change working directory to the directory that contains the specified 296 * file. 297 */ 298 static int 299 ftp_cwd(conn_t *conn, const char *path, int subdir) 300 { 301 const char *beg, *end; 302 char *pwd, *dst; 303 int e; 304 size_t i, len; 305 306 if (*path != '/') { 307 ftp_seterr(501); 308 return (-1); 309 } 310 ++path; 311 312 /* Simple case: still in the home directory and no directory change. */ 313 if (conn->ftp_home == NULL && strchr(path, '/') == NULL && 314 (!subdir || *path == '\0')) 315 return 0; 316 317 if ((e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || 318 (e = ftp_pwd(conn, &pwd)) != FTP_OK) { 319 ftp_seterr(e); 320 return (-1); 321 } 322 if (conn->ftp_home == NULL && (conn->ftp_home = strdup(pwd)) == NULL) { 323 fetch_syserr(); 324 free(pwd); 325 return (-1); 326 } 327 if (*path == '/') { 328 while (path[1] == '/') 329 ++path; 330 dst = strdup(path); 331 } else if (strcmp(conn->ftp_home, "/") == 0) { 332 dst = strdup(path - 1); 333 } else { 334 asprintf(&dst, "%s/%s", conn->ftp_home, path); 335 } 336 if (dst == NULL) { 337 fetch_syserr(); 338 free(pwd); 339 return (-1); 340 } 341 342 if (subdir) 343 end = dst + strlen(dst); 344 else 345 end = strrchr(dst, '/'); 346 347 for (;;) { 348 len = strlen(pwd); 349 350 /* Look for a common prefix between PWD and dir to fetch. */ 351 for (i = 0; i <= len && i <= (size_t)(end - dst); ++i) 352 if (pwd[i] != dst[i]) 353 break; 354 /* Keep going up a dir until we have a matching prefix. */ 355 if (strcmp(pwd, "/") == 0) 356 break; 357 if (pwd[i] == '\0' && (dst[i - 1] == '/' || dst[i] == '/')) 358 break; 359 free(pwd); 360 if ((e = ftp_cmd(conn, "CDUP\r\n")) != FTP_FILE_ACTION_OK || 361 (e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || 362 (e = ftp_pwd(conn, &pwd)) != FTP_OK) { 363 ftp_seterr(e); 364 free(dst); 365 return (-1); 366 } 367 } 368 free(pwd); 369 370 #ifdef FTP_COMBINE_CWDS 371 /* Skip leading slashes, even "////". */ 372 for (beg = dst + i; beg < end && *beg == '/'; ++beg, ++i) 373 /* nothing */ ; 374 375 /* If there is no trailing dir, we're already there. */ 376 if (beg >= end) { 377 free(dst); 378 return (0); 379 } 380 381 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 382 e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(end - beg), beg); 383 if (e == FTP_FILE_ACTION_OK) { 384 free(dst); 385 return (0); 386 } 387 #endif /* FTP_COMBINE_CWDS */ 388 389 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 390 for (beg = dst + i; beg < end; beg = dst + i + 1) { 391 while (*beg == '/') 392 ++beg, ++i; 393 for (++i; dst + i < end && dst[i] != '/'; ++i) 394 /* nothing */ ; 395 e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(dst + i - beg), beg); 396 if (e != FTP_FILE_ACTION_OK) { 397 free(dst); 398 ftp_seterr(e); 399 return (-1); 400 } 401 } 402 free(dst); 403 return (0); 404 } 405 406 /* 407 * Set transfer mode and data type 408 */ 409 static int 410 ftp_mode_type(conn_t *conn, int mode, int type) 411 { 412 int e; 413 414 switch (mode) { 415 case 0: 416 case 's': 417 mode = 'S'; 418 /*FALLTHROUGH*/ 419 case 'S': 420 break; 421 default: 422 return (FTP_PROTOCOL_ERROR); 423 } 424 if ((e = ftp_cmd(conn, "MODE %c\r\n", mode)) != FTP_OK) { 425 if (mode == 'S') { 426 /* 427 * Stream mode is supposed to be the default - so 428 * much so that some servers not only do not 429 * support any other mode, but do not support the 430 * MODE command at all. 431 * 432 * If "MODE S" fails, it is unlikely that we 433 * previously succeeded in setting a different 434 * mode. Therefore, we simply hope that the 435 * server is already in the correct mode, and 436 * silently ignore the failure. 437 */ 438 } else { 439 return (e); 440 } 441 } 442 443 switch (type) { 444 case 0: 445 case 'i': 446 type = 'I'; 447 /*FALLTHROUGH*/ 448 case 'I': 449 break; 450 case 'a': 451 type = 'A'; 452 /*FALLTHROUGH*/ 453 case 'A': 454 break; 455 case 'd': 456 type = 'D'; 457 /*FALLTHROUGH*/ 458 case 'D': 459 /* can't handle yet */ 460 default: 461 return (FTP_PROTOCOL_ERROR); 462 } 463 if ((e = ftp_cmd(conn, "TYPE %c\r\n", type)) != FTP_OK) 464 return (e); 465 466 return (FTP_OK); 467 } 468 469 /* 470 * Request and parse file stats 471 */ 472 static int 473 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 474 { 475 char *ln; 476 const char *filename; 477 size_t filenamelen; 478 int type; 479 struct tm tm; 480 time_t t; 481 int e; 482 483 us->size = -1; 484 us->atime = us->mtime = 0; 485 486 filename = ftp_filename(file, &filenamelen, &type, 0); 487 488 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 489 ftp_seterr(e); 490 return (-1); 491 } 492 493 e = ftp_cmd(conn, "SIZE %.*s\r\n", (int)filenamelen, filename); 494 if (e != FTP_FILE_STATUS) { 495 ftp_seterr(e); 496 return (-1); 497 } 498 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 499 /* nothing */ ; 500 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 501 us->size = us->size * 10 + *ln - '0'; 502 if (*ln && !isspace((unsigned char)*ln)) { 503 ftp_seterr(FTP_PROTOCOL_ERROR); 504 us->size = -1; 505 return (-1); 506 } 507 if (us->size == 0) 508 us->size = -1; 509 510 e = ftp_cmd(conn, "MDTM %.*s\r\n", (int)filenamelen, filename); 511 if (e != FTP_FILE_STATUS) { 512 ftp_seterr(e); 513 return (-1); 514 } 515 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 516 /* nothing */ ; 517 switch (strspn(ln, "0123456789")) { 518 case 14: 519 break; 520 case 15: 521 ln++; 522 ln[0] = '2'; 523 ln[1] = '0'; 524 break; 525 default: 526 ftp_seterr(FTP_PROTOCOL_ERROR); 527 return (-1); 528 } 529 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 530 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 531 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 532 ftp_seterr(FTP_PROTOCOL_ERROR); 533 return (-1); 534 } 535 tm.tm_mon--; 536 tm.tm_year -= 1900; 537 tm.tm_isdst = -1; 538 t = timegm(&tm); 539 if (t == (time_t)-1) 540 t = time(NULL); 541 us->mtime = t; 542 us->atime = t; 543 544 return (0); 545 } 546 547 /* 548 * I/O functions for FTP 549 */ 550 struct ftpio { 551 conn_t *cconn; /* Control connection */ 552 conn_t *dconn; /* Data connection */ 553 int dir; /* Direction */ 554 int eof; /* EOF reached */ 555 int err; /* Error code */ 556 }; 557 558 static ssize_t ftp_readfn(void *, void *, size_t); 559 static ssize_t ftp_writefn(void *, const void *, size_t); 560 static void ftp_closefn(void *); 561 562 static ssize_t 563 ftp_readfn(void *v, void *buf, size_t len) 564 { 565 struct ftpio *io; 566 ssize_t r; 567 568 io = (struct ftpio *)v; 569 if (io == NULL) { 570 errno = EBADF; 571 return (-1); 572 } 573 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 574 errno = EBADF; 575 return (-1); 576 } 577 if (io->err) { 578 errno = io->err; 579 return (-1); 580 } 581 if (io->eof) 582 return (0); 583 r = fetch_read(io->dconn, buf, len); 584 if (r > 0) 585 return (r); 586 if (r == 0) { 587 io->eof = 1; 588 return (0); 589 } 590 if (errno != EINTR) 591 io->err = errno; 592 return (-1); 593 } 594 595 static ssize_t 596 ftp_writefn(void *v, const void *buf, size_t len) 597 { 598 struct ftpio *io; 599 ssize_t w; 600 601 io = (struct ftpio *)v; 602 if (io == NULL) { 603 errno = EBADF; 604 return (-1); 605 } 606 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 607 errno = EBADF; 608 return (-1); 609 } 610 if (io->err) { 611 errno = io->err; 612 return (-1); 613 } 614 w = fetch_write(io->dconn, buf, len); 615 if (w >= 0) 616 return (w); 617 if (errno != EINTR) 618 io->err = errno; 619 return (-1); 620 } 621 622 static int 623 ftp_disconnect(conn_t *conn) 624 { 625 ftp_cmd(conn, "QUIT\r\n"); 626 return fetch_close(conn); 627 } 628 629 static void 630 ftp_closefn(void *v) 631 { 632 struct ftpio *io; 633 634 io = (struct ftpio *)v; 635 if (io == NULL) { 636 errno = EBADF; 637 return; 638 } 639 if (io->dir == -1) 640 return; 641 if (io->cconn == NULL || io->dconn == NULL) { 642 errno = EBADF; 643 return; 644 } 645 fetch_close(io->dconn); 646 io->dconn = NULL; 647 io->dir = -1; 648 (void)ftp_chkerr(io->cconn); 649 fetch_cache_put(io->cconn, ftp_disconnect); 650 free(io); 651 return; 652 } 653 654 static fetchIO * 655 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 656 { 657 struct ftpio *io; 658 fetchIO *f; 659 660 if (cconn == NULL || dconn == NULL) 661 return (NULL); 662 if ((io = malloc(sizeof(*io))) == NULL) 663 return (NULL); 664 io->cconn = cconn; 665 io->dconn = dconn; 666 io->dir = mode; 667 io->eof = io->err = 0; 668 f = fetchIO_unopen(io, ftp_readfn, ftp_writefn, ftp_closefn); 669 if (f == NULL) 670 free(io); 671 return (f); 672 } 673 674 /* 675 * Transfer file 676 */ 677 static fetchIO * 678 ftp_transfer(conn_t *conn, const char *oper, const char *file, const char *op_arg, 679 int mode, off_t offset, const char *flags) 680 { 681 union anonymous { 682 struct sockaddr_storage ss; 683 struct sockaddr sa; 684 struct sockaddr_in6 sin6; 685 struct sockaddr_in sin4; 686 } u; 687 const char *bindaddr; 688 const char *filename; 689 size_t filenamelen; 690 int type; 691 int low, pasv, verbose; 692 int e, sd = -1; 693 socklen_t l; 694 char *s; 695 fetchIO *df; 696 697 /* check flags */ 698 low = CHECK_FLAG('l'); 699 pasv = !CHECK_FLAG('a'); 700 verbose = CHECK_FLAG('v'); 701 702 /* passive mode */ 703 if (!pasv) 704 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 705 strncasecmp(s, "no", 2) != 0); 706 707 /* isolate filename */ 708 filename = ftp_filename(file, &filenamelen, &type, op_arg != NULL); 709 710 /* set transfer mode and data type */ 711 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 712 goto ouch; 713 714 /* find our own address, bind, and listen */ 715 l = sizeof(u.ss); 716 if (getsockname(conn->sd, &u.sa, &l) == -1) 717 goto sysouch; 718 if (u.ss.ss_family == AF_INET6) 719 unmappedaddr(&u.sin6, &l); 720 721 retry_mode: 722 723 /* open data socket */ 724 if ((sd = socket(u.ss.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 725 fetch_syserr(); 726 return (NULL); 727 } 728 729 if (pasv) { 730 unsigned char addr[64]; 731 char *ln, *p; 732 unsigned int i; 733 int port; 734 735 /* send PASV command */ 736 if (verbose) 737 fetch_info("setting passive mode"); 738 switch (u.ss.ss_family) { 739 case AF_INET: 740 if ((e = ftp_cmd(conn, "PASV\r\n")) != FTP_PASSIVE_MODE) 741 goto ouch; 742 break; 743 case AF_INET6: 744 if ((e = ftp_cmd(conn, "EPSV\r\n")) != FTP_EPASSIVE_MODE) { 745 if (e == -1) 746 goto ouch; 747 if ((e = ftp_cmd(conn, "LPSV\r\n")) != 748 FTP_LPASSIVE_MODE) 749 goto ouch; 750 } 751 break; 752 default: 753 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 754 goto ouch; 755 } 756 757 /* 758 * Find address and port number. The reply to the PASV command 759 * is IMHO the one and only weak point in the FTP protocol. 760 */ 761 ln = conn->buf; 762 switch (e) { 763 case FTP_PASSIVE_MODE: 764 case FTP_LPASSIVE_MODE: 765 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 766 /* nothing */ ; 767 if (!*p) { 768 e = FTP_PROTOCOL_ERROR; 769 goto ouch; 770 } 771 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 772 for (i = 0; *p && i < l; i++, p++) 773 addr[i] = (unsigned char)strtol(p, &p, 10); 774 if (i < l) { 775 e = FTP_PROTOCOL_ERROR; 776 goto ouch; 777 } 778 break; 779 case FTP_EPASSIVE_MODE: 780 for (p = ln + 3; *p && *p != '('; p++) 781 /* nothing */ ; 782 if (!*p) { 783 e = FTP_PROTOCOL_ERROR; 784 goto ouch; 785 } 786 ++p; 787 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 788 &port, &addr[3]) != 5 || 789 addr[0] != addr[1] || 790 addr[0] != addr[2] || addr[0] != addr[3]) { 791 e = FTP_PROTOCOL_ERROR; 792 goto ouch; 793 } 794 break; 795 case FTP_SYNTAX_ERROR: 796 if (verbose) 797 fetch_info("passive mode failed"); 798 /* Close socket and retry with passive mode. */ 799 pasv = 0; 800 close(sd); 801 sd = -1; 802 goto retry_mode; 803 } 804 805 /* seek to required offset */ 806 if (offset) 807 if (ftp_cmd(conn, "REST %lu\r\n", (unsigned long)offset) != FTP_FILE_OK) 808 goto sysouch; 809 810 /* construct sockaddr for data socket */ 811 l = sizeof(u.ss); 812 if (getpeername(conn->sd, &u.sa, &l) == -1) 813 goto sysouch; 814 if (u.ss.ss_family == AF_INET6) 815 unmappedaddr(&u.sin6, &l); 816 switch (u.ss.ss_family) { 817 case AF_INET6: 818 if (e == FTP_EPASSIVE_MODE) 819 u.sin6.sin6_port = htons(port); 820 else { 821 memcpy(&u.sin6.sin6_addr, addr + 2, 16); 822 memcpy(&u.sin6.sin6_port, addr + 19, 2); 823 } 824 break; 825 case AF_INET: 826 if (e == FTP_EPASSIVE_MODE) 827 u.sin4.sin_port = htons(port); 828 else { 829 memcpy(&u.sin4.sin_addr, addr, 4); 830 memcpy(&u.sin4.sin_port, addr + 4, 2); 831 } 832 break; 833 default: 834 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 835 break; 836 } 837 838 /* connect to data port */ 839 if (verbose) 840 fetch_info("opening data connection"); 841 bindaddr = getenv("FETCH_BIND_ADDRESS"); 842 if (bindaddr != NULL && *bindaddr != '\0' && 843 fetch_bind(sd, u.ss.ss_family, bindaddr) != 0) 844 goto sysouch; 845 if (connect(sd, &u.sa, l) == -1) 846 goto sysouch; 847 848 /* make the server initiate the transfer */ 849 if (verbose) 850 fetch_info("initiating transfer"); 851 if (op_arg) 852 e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); 853 else 854 e = ftp_cmd(conn, "%s %.*s\r\n", oper, 855 (int)filenamelen, filename); 856 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 857 goto ouch; 858 859 } else { 860 uint32_t a; 861 uint16_t p; 862 #if defined(IPV6_PORTRANGE) || defined(IP_PORTRANGE) 863 int arg; 864 #endif 865 int d; 866 char hname[INET6_ADDRSTRLEN]; 867 868 switch (u.ss.ss_family) { 869 case AF_INET6: 870 u.sin6.sin6_port = 0; 871 #ifdef IPV6_PORTRANGE 872 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 873 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 874 &arg, (socklen_t)sizeof(arg)) == -1) 875 goto sysouch; 876 #endif 877 break; 878 case AF_INET: 879 u.sin4.sin_port = 0; 880 #ifdef IP_PORTRANGE 881 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 882 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 883 &arg, (socklen_t)sizeof(arg)) == -1) 884 goto sysouch; 885 #endif 886 break; 887 } 888 if (verbose) 889 fetch_info("binding data socket"); 890 if (bind(sd, &u.sa, l) == -1) 891 goto sysouch; 892 if (listen(sd, 1) == -1) 893 goto sysouch; 894 895 /* find what port we're on and tell the server */ 896 if (getsockname(sd, &u.sa, &l) == -1) 897 goto sysouch; 898 switch (u.ss.ss_family) { 899 case AF_INET: 900 a = ntohl(u.sin4.sin_addr.s_addr); 901 p = ntohs(u.sin4.sin_port); 902 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d\r\n", 903 (a >> 24) & 0xff, (a >> 16) & 0xff, 904 (a >> 8) & 0xff, a & 0xff, 905 ((unsigned int)p >> 8) & 0xff, p & 0xff); 906 break; 907 case AF_INET6: 908 e = -1; 909 u.sin6.sin6_scope_id = 0; 910 if (getnameinfo(&u.sa, l, 911 hname, (socklen_t)sizeof(hname), 912 NULL, 0, NI_NUMERICHOST) == 0) { 913 e = ftp_cmd(conn, "EPRT |%d|%s|%d|\r\n", 2, hname, 914 htons(u.sin6.sin6_port)); 915 if (e == -1) 916 goto ouch; 917 } 918 if (e != FTP_OK) { 919 uint8_t aa[sizeof(u.sin6.sin6_addr)]; 920 memcpy(aa, &u.sin6.sin6_addr, sizeof(aa)); 921 p = ntohs(u.sin6.sin6_port); 922 e = ftp_cmd(conn, 923 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d\r\n", 924 6, 16, 925 aa[ 0], aa[ 1], aa[ 2], aa[ 3], 926 aa[ 4], aa[ 5], aa[ 6], aa[ 7], 927 aa[ 8], aa[ 9], aa[10], aa[11], 928 aa[12], aa[13], aa[14], aa[15], 929 2, 930 ((unsigned int)p >> 8) & 0xff, p & 0xff); 931 } 932 break; 933 default: 934 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 935 goto ouch; 936 } 937 if (e != FTP_OK) 938 goto ouch; 939 940 /* seek to required offset */ 941 if (offset) 942 if (ftp_cmd(conn, "REST %llu\r\n", (unsigned long long)offset) != FTP_FILE_OK) 943 goto sysouch; 944 945 /* make the server initiate the transfer */ 946 if (verbose) 947 fetch_info("initiating transfer"); 948 if (op_arg) 949 e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); 950 else 951 e = ftp_cmd(conn, "%s %.*s\r\n", oper, 952 (int)filenamelen, filename); 953 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 954 goto ouch; 955 956 /* accept the incoming connection and go to town */ 957 if ((d = accept(sd, NULL, NULL)) == -1) 958 goto sysouch; 959 close(sd); 960 sd = d; 961 } 962 963 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 964 goto sysouch; 965 return (df); 966 967 sysouch: 968 fetch_syserr(); 969 if (sd >= 0) 970 close(sd); 971 return (NULL); 972 973 ouch: 974 if (e != -1) 975 ftp_seterr(e); 976 if (sd >= 0) 977 close(sd); 978 return (NULL); 979 } 980 981 /* 982 * Authenticate 983 */ 984 static int 985 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 986 { 987 const char *user, *pwd, *login_name; 988 char pbuf[URL_USERLEN + 1 + URL_HOSTLEN + 1]; 989 int e, len; 990 991 /* XXX FTP_AUTH, and maybe .netrc */ 992 993 /* send user name and password */ 994 if (url->user[0] == '\0') 995 fetch_netrc_auth(url); 996 user = url->user; 997 if (*user == '\0') 998 user = getenv("FTP_LOGIN"); 999 if (user == NULL || *user == '\0') 1000 user = FTP_ANONYMOUS_USER; 1001 if (purl && url->port == fetch_default_port(url->scheme)) 1002 e = ftp_cmd(conn, "USER %s@%s\r\n", user, url->host); 1003 else if (purl) 1004 e = ftp_cmd(conn, "USER %s@%s@%d\r\n", user, url->host, url->port); 1005 else 1006 e = ftp_cmd(conn, "USER %s\r\n", user); 1007 1008 /* did the server request a password? */ 1009 if (e == FTP_NEED_PASSWORD) { 1010 pwd = url->pwd; 1011 if (*pwd == '\0') 1012 pwd = getenv("FTP_PASSWORD"); 1013 if (pwd == NULL || *pwd == '\0') { 1014 if ((login_name = getlogin()) == 0) 1015 login_name = FTP_ANONYMOUS_USER; 1016 if ((len = snprintf(pbuf, URL_USERLEN + 2, "%s@", login_name)) < 0) 1017 len = 0; 1018 else if (len > URL_USERLEN + 1) 1019 len = URL_USERLEN + 1; 1020 gethostname(pbuf + len, sizeof(pbuf) - len); 1021 /* MAXHOSTNAMELEN can differ from URL_HOSTLEN + 1 */ 1022 pbuf[sizeof(pbuf) - 1] = '\0'; 1023 pwd = pbuf; 1024 } 1025 e = ftp_cmd(conn, "PASS %s\r\n", pwd); 1026 } 1027 1028 return (e); 1029 } 1030 1031 /* 1032 * Log on to FTP server 1033 */ 1034 static conn_t * 1035 ftp_connect(struct url *url, struct url *purl, const char *flags) 1036 { 1037 conn_t *conn; 1038 int e, direct, verbose; 1039 #ifdef INET6 1040 int af = AF_UNSPEC; 1041 #else 1042 int af = AF_INET; 1043 #endif 1044 1045 direct = CHECK_FLAG('d'); 1046 verbose = CHECK_FLAG('v'); 1047 if (CHECK_FLAG('4')) 1048 af = AF_INET; 1049 else if (CHECK_FLAG('6')) 1050 af = AF_INET6; 1051 1052 if (direct) 1053 purl = NULL; 1054 1055 /* check for proxy */ 1056 if (purl) { 1057 /* XXX proxy authentication! */ 1058 /* XXX connetion caching */ 1059 if (!purl->port) 1060 purl->port = fetch_default_port(purl->scheme); 1061 1062 conn = fetch_connect(purl, af, verbose); 1063 } else { 1064 /* no proxy, go straight to target */ 1065 if (!url->port) 1066 url->port = fetch_default_port(url->scheme); 1067 1068 while ((conn = fetch_cache_get(url, af)) != NULL) { 1069 e = ftp_cmd(conn, "NOOP\r\n"); 1070 if (e == FTP_OK) 1071 return conn; 1072 fetch_close(conn); 1073 } 1074 conn = fetch_connect(url, af, verbose); 1075 purl = NULL; 1076 } 1077 1078 /* check connection */ 1079 if (conn == NULL) 1080 /* fetch_connect() has already set an error code */ 1081 return (NULL); 1082 1083 /* expect welcome message */ 1084 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 1085 goto fouch; 1086 1087 /* authenticate */ 1088 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 1089 goto fouch; 1090 1091 /* TODO: Request extended features supported, if any (RFC 3659). */ 1092 1093 /* done */ 1094 return (conn); 1095 1096 fouch: 1097 if (e != -1) 1098 ftp_seterr(e); 1099 fetch_close(conn); 1100 return (NULL); 1101 } 1102 1103 /* 1104 * Check the proxy settings 1105 */ 1106 static struct url * 1107 ftp_get_proxy(struct url * url, const char *flags) 1108 { 1109 struct url *purl; 1110 char *p, *fp, *FP, *hp, *HP; 1111 1112 if (flags != NULL && strchr(flags, 'd') != NULL) 1113 return NULL; 1114 if (fetch_no_proxy_match(url->host)) 1115 return NULL; 1116 1117 FP = getenv("FTP_PROXY"); 1118 fp = getenv("ftp_proxy"); 1119 HP = getenv("HTTP_PROXY"); 1120 hp = getenv("http_proxy"); 1121 1122 if ((((p = FP) || (p = fp) || (p = HP) || (p = hp))) && 1123 *p && (purl = fetchParseURL(p)) != NULL) { 1124 if (!*purl->scheme) { 1125 if (fp || FP) 1126 strcpy(purl->scheme, SCHEME_FTP); 1127 else 1128 strcpy(purl->scheme, SCHEME_HTTP); 1129 } 1130 if (!purl->port) 1131 purl->port = fetch_default_proxy_port(purl->scheme); 1132 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1133 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1134 return purl; 1135 fetchFreeURL(purl); 1136 } 1137 return NULL; 1138 } 1139 1140 /* 1141 * Process an FTP request 1142 */ 1143 fetchIO * 1144 ftp_request(struct url *url, const char *op, const char *op_arg, 1145 struct url_stat *us, struct url *purl, const char *flags) 1146 { 1147 fetchIO *f; 1148 char *path; 1149 conn_t *conn; 1150 int if_modified_since, oflag; 1151 struct url_stat local_us; 1152 1153 /* check if we should use HTTP instead */ 1154 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1155 if (strcmp(op, "STAT") == 0) 1156 return (http_request(url, "HEAD", us, purl, flags)); 1157 else if (strcmp(op, "RETR") == 0) 1158 return (http_request(url, "GET", us, purl, flags)); 1159 /* 1160 * Our HTTP code doesn't support PUT requests yet, so try 1161 * a direct connection. 1162 */ 1163 } 1164 1165 /* connect to server */ 1166 conn = ftp_connect(url, purl, flags); 1167 if (purl) 1168 fetchFreeURL(purl); 1169 if (conn == NULL) 1170 return (NULL); 1171 1172 if ((path = fetchUnquotePath(url)) == NULL) { 1173 fetch_syserr(); 1174 return NULL; 1175 } 1176 1177 /* change directory */ 1178 if (ftp_cwd(conn, path, op_arg != NULL) == -1) { 1179 free(path); 1180 return (NULL); 1181 } 1182 1183 if_modified_since = CHECK_FLAG('i'); 1184 if (if_modified_since && us == NULL) 1185 us = &local_us; 1186 1187 /* stat file */ 1188 if (us && ftp_stat(conn, path, us) == -1 1189 && fetchLastErrCode != FETCH_PROTO 1190 && fetchLastErrCode != FETCH_UNAVAIL) { 1191 free(path); 1192 return (NULL); 1193 } 1194 1195 if (if_modified_since && url->last_modified > 0 && 1196 url->last_modified >= us->mtime) { 1197 free(path); 1198 fetchLastErrCode = FETCH_UNCHANGED; 1199 snprintf(fetchLastErrString, MAXERRSTRING, "Unchanged"); 1200 return NULL; 1201 } 1202 1203 /* just a stat */ 1204 if (strcmp(op, "STAT") == 0) { 1205 free(path); 1206 return fetchIO_unopen(NULL, NULL, NULL, NULL); 1207 } 1208 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1209 oflag = O_WRONLY; 1210 else 1211 oflag = O_RDONLY; 1212 1213 /* initiate the transfer */ 1214 f = (ftp_transfer(conn, op, path, op_arg, oflag, url->offset, flags)); 1215 free(path); 1216 return f; 1217 } 1218 1219 /* 1220 * Get and stat file 1221 */ 1222 fetchIO * 1223 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1224 { 1225 return (ftp_request(url, "RETR", NULL, us, ftp_get_proxy(url, flags), flags)); 1226 } 1227 1228 /* 1229 * Get file 1230 */ 1231 fetchIO * 1232 fetchGetFTP(struct url *url, const char *flags) 1233 { 1234 return (fetchXGetFTP(url, NULL, flags)); 1235 } 1236 1237 /* 1238 * Put file 1239 */ 1240 fetchIO * 1241 fetchPutFTP(struct url *url, const char *flags) 1242 { 1243 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, NULL, 1244 ftp_get_proxy(url, flags), flags)); 1245 } 1246 1247 /* 1248 * Get file stats 1249 */ 1250 int 1251 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1252 { 1253 fetchIO *f; 1254 1255 f = ftp_request(url, "STAT", NULL, us, ftp_get_proxy(url, flags), flags); 1256 if (f == NULL) 1257 return (-1); 1258 fetchIO_close(f); 1259 return (0); 1260 } 1261 1262 /* 1263 * List a directory 1264 */ 1265 int 1266 fetchListFTP(struct url_list *ue, struct url *url, const char *pattern, const char *flags) 1267 { 1268 fetchIO *f; 1269 char buf[2 * PATH_MAX], *eol, *eos; 1270 ssize_t len; 1271 size_t cur_off; 1272 int ret; 1273 1274 /* XXX What about proxies? */ 1275 if (pattern == NULL || strcmp(pattern, "*") == 0) 1276 pattern = ""; 1277 f = ftp_request(url, "NLST", pattern, NULL, ftp_get_proxy(url, flags), flags); 1278 if (f == NULL) 1279 return -1; 1280 1281 cur_off = 0; 1282 ret = 0; 1283 1284 while ((len = fetchIO_read(f, buf + cur_off, sizeof(buf) - cur_off)) > 0) { 1285 cur_off += len; 1286 while ((eol = memchr(buf, '\n', cur_off)) != NULL) { 1287 if (len == eol - buf) 1288 break; 1289 if (eol != buf) { 1290 if (eol[-1] == '\r') 1291 eos = eol - 1; 1292 else 1293 eos = eol; 1294 *eos = '\0'; 1295 ret = fetch_add_entry(ue, url, buf, 0); 1296 if (ret) 1297 break; 1298 cur_off -= eol - buf + 1; 1299 memmove(buf, eol + 1, cur_off); 1300 } 1301 } 1302 if (ret) 1303 break; 1304 } 1305 if (cur_off != 0 || len < 0) { 1306 /* Not RFC conform, bail out. */ 1307 fetchIO_close(f); 1308 return -1; 1309 } 1310 fetchIO_close(f); 1311 return ret; 1312 } 1313