1 /* $NetBSD: ftp.c,v 1.5 2011/08/17 09:19:38 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 addr = *(uint32_t *)(void *)&sin6->sin6_addr.s6_addr[12]; 149 port = sin6->sin6_port; 150 memset(sin4, 0, sizeof(struct sockaddr_in)); 151 sin4->sin_addr.s_addr = addr; 152 sin4->sin_port = port; 153 sin4->sin_family = AF_INET; 154 *len = sizeof(struct sockaddr_in); 155 #ifdef HAVE_SA_LEN 156 sin4->sin_len = sizeof(struct sockaddr_in); 157 #endif 158 } 159 160 /* 161 * Get server response 162 */ 163 static int 164 ftp_chkerr(conn_t *conn) 165 { 166 if (fetch_getln(conn) == -1) { 167 fetch_syserr(); 168 return (-1); 169 } 170 if (isftpinfo(conn->buf)) { 171 while (conn->buflen && !isftpreply(conn->buf)) { 172 if (fetch_getln(conn) == -1) { 173 fetch_syserr(); 174 return (-1); 175 } 176 } 177 } 178 179 while (conn->buflen && 180 isspace((unsigned char)conn->buf[conn->buflen - 1])) 181 conn->buflen--; 182 conn->buf[conn->buflen] = '\0'; 183 184 if (!isftpreply(conn->buf)) { 185 ftp_seterr(FTP_PROTOCOL_ERROR); 186 return (-1); 187 } 188 189 conn->err = (conn->buf[0] - '0') * 100 190 + (conn->buf[1] - '0') * 10 191 + (conn->buf[2] - '0'); 192 193 return (conn->err); 194 } 195 196 /* 197 * Send a command and check reply 198 */ 199 static int 200 ftp_cmd(conn_t *conn, const char *fmt, ...) 201 { 202 va_list ap; 203 size_t len; 204 char *msg; 205 ssize_t r; 206 207 va_start(ap, fmt); 208 len = vasprintf(&msg, fmt, ap); 209 va_end(ap); 210 211 if (msg == NULL) { 212 errno = ENOMEM; 213 fetch_syserr(); 214 return (-1); 215 } 216 217 r = fetch_write(conn, msg, len); 218 free(msg); 219 220 if (r == -1) { 221 fetch_syserr(); 222 return (-1); 223 } 224 225 return (ftp_chkerr(conn)); 226 } 227 228 /* 229 * Return a pointer to the filename part of a path 230 */ 231 static const char * 232 ftp_filename(const char *file, size_t *len, int *type, int subdir) 233 { 234 const char *s; 235 236 if ((s = strrchr(file, '/')) == NULL || subdir) 237 s = file; 238 else 239 s = s + 1; 240 *len = strlen(s); 241 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 242 *type = s[*len - 1]; 243 *len -= 7; 244 } else { 245 *type = '\0'; 246 } 247 return (s); 248 } 249 250 /* 251 * Get current working directory from the reply to a CWD, PWD or CDUP 252 * command. 253 */ 254 static int 255 ftp_pwd(conn_t *conn, char **pwd) 256 { 257 char *src, *dst, *end; 258 int q; 259 size_t len; 260 261 if (conn->err != FTP_WORKING_DIRECTORY && 262 conn->err != FTP_FILE_ACTION_OK) 263 return (FTP_PROTOCOL_ERROR); 264 end = conn->buf + conn->buflen; 265 src = conn->buf + 4; 266 if (src >= end || *src++ != '"') 267 return (FTP_PROTOCOL_ERROR); 268 len = end - src + 1; 269 *pwd = malloc(len); 270 if (*pwd == NULL) 271 return (FTP_PROTOCOL_ERROR); 272 for (q = 0, dst = *pwd; src < end; ++src) { 273 if (!q && *src == '"') 274 q = 1; 275 else if (q && *src != '"') 276 break; 277 else if (q) 278 *dst++ = '"', q = 0; 279 else 280 *dst++ = *src; 281 } 282 *dst = '\0'; 283 if (**pwd != '/') { 284 free(*pwd); 285 *pwd = NULL; 286 return (FTP_PROTOCOL_ERROR); 287 } 288 return (FTP_OK); 289 } 290 291 /* 292 * Change working directory to the directory that contains the specified 293 * file. 294 */ 295 static int 296 ftp_cwd(conn_t *conn, const char *path, int subdir) 297 { 298 const char *beg, *end; 299 char *pwd, *dst; 300 int e; 301 size_t i, len; 302 303 if (*path != '/') { 304 ftp_seterr(501); 305 return (-1); 306 } 307 ++path; 308 309 /* Simple case: still in the home directory and no directory change. */ 310 if (conn->ftp_home == NULL && strchr(path, '/') == NULL && 311 (!subdir || *path == '\0')) 312 return 0; 313 314 if ((e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || 315 (e = ftp_pwd(conn, &pwd)) != FTP_OK) { 316 ftp_seterr(e); 317 return (-1); 318 } 319 if (conn->ftp_home == NULL && (conn->ftp_home = strdup(pwd)) == NULL) { 320 fetch_syserr(); 321 free(pwd); 322 return (-1); 323 } 324 if (*path == '/') { 325 while (path[1] == '/') 326 ++path; 327 dst = strdup(path); 328 } else if (strcmp(conn->ftp_home, "/") == 0) { 329 dst = strdup(path - 1); 330 } else { 331 asprintf(&dst, "%s/%s", conn->ftp_home, path); 332 } 333 if (dst == NULL) { 334 fetch_syserr(); 335 free(pwd); 336 return (-1); 337 } 338 339 if (subdir) 340 end = dst + strlen(dst); 341 else 342 end = strrchr(dst, '/'); 343 344 for (;;) { 345 len = strlen(pwd); 346 347 /* Look for a common prefix between PWD and dir to fetch. */ 348 for (i = 0; i <= len && i <= (size_t)(end - dst); ++i) 349 if (pwd[i] != dst[i]) 350 break; 351 /* Keep going up a dir until we have a matching prefix. */ 352 if (strcmp(pwd, "/") == 0) 353 break; 354 if (pwd[i] == '\0' && (dst[i - 1] == '/' || dst[i] == '/')) 355 break; 356 free(pwd); 357 if ((e = ftp_cmd(conn, "CDUP\r\n")) != FTP_FILE_ACTION_OK || 358 (e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || 359 (e = ftp_pwd(conn, &pwd)) != FTP_OK) { 360 ftp_seterr(e); 361 free(dst); 362 return (-1); 363 } 364 } 365 free(pwd); 366 367 #ifdef FTP_COMBINE_CWDS 368 /* Skip leading slashes, even "////". */ 369 for (beg = dst + i; beg < end && *beg == '/'; ++beg, ++i) 370 /* nothing */ ; 371 372 /* If there is no trailing dir, we're already there. */ 373 if (beg >= end) { 374 free(dst); 375 return (0); 376 } 377 378 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 379 e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(end - beg), beg); 380 if (e == FTP_FILE_ACTION_OK) { 381 free(dst); 382 return (0); 383 } 384 #endif /* FTP_COMBINE_CWDS */ 385 386 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 387 for (beg = dst + i; beg < end; beg = dst + i + 1) { 388 while (*beg == '/') 389 ++beg, ++i; 390 for (++i; dst + i < end && dst[i] != '/'; ++i) 391 /* nothing */ ; 392 e = ftp_cmd(conn, "CWD %.*s\r\n", dst + i - beg, beg); 393 if (e != FTP_FILE_ACTION_OK) { 394 free(dst); 395 ftp_seterr(e); 396 return (-1); 397 } 398 } 399 free(dst); 400 return (0); 401 } 402 403 /* 404 * Set transfer mode and data type 405 */ 406 static int 407 ftp_mode_type(conn_t *conn, int mode, int type) 408 { 409 int e; 410 411 switch (mode) { 412 case 0: 413 case 's': 414 mode = 'S'; 415 /*FALLTHROUGH*/ 416 case 'S': 417 break; 418 default: 419 return (FTP_PROTOCOL_ERROR); 420 } 421 if ((e = ftp_cmd(conn, "MODE %c\r\n", mode)) != FTP_OK) { 422 if (mode == 'S') { 423 /* 424 * Stream mode is supposed to be the default - so 425 * much so that some servers not only do not 426 * support any other mode, but do not support the 427 * MODE command at all. 428 * 429 * If "MODE S" fails, it is unlikely that we 430 * previously succeeded in setting a different 431 * mode. Therefore, we simply hope that the 432 * server is already in the correct mode, and 433 * silently ignore the failure. 434 */ 435 } else { 436 return (e); 437 } 438 } 439 440 switch (type) { 441 case 0: 442 case 'i': 443 type = 'I'; 444 /*FALLTHROUGH*/ 445 case 'I': 446 break; 447 case 'a': 448 type = 'A'; 449 /*FALLTHROUGH*/ 450 case 'A': 451 break; 452 case 'd': 453 type = 'D'; 454 /*FALLTHROUGH*/ 455 case 'D': 456 /* can't handle yet */ 457 default: 458 return (FTP_PROTOCOL_ERROR); 459 } 460 if ((e = ftp_cmd(conn, "TYPE %c\r\n", type)) != FTP_OK) 461 return (e); 462 463 return (FTP_OK); 464 } 465 466 /* 467 * Request and parse file stats 468 */ 469 static int 470 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 471 { 472 char *ln; 473 const char *filename; 474 size_t filenamelen; 475 int type; 476 struct tm tm; 477 time_t t; 478 int e; 479 480 us->size = -1; 481 us->atime = us->mtime = 0; 482 483 filename = ftp_filename(file, &filenamelen, &type, 0); 484 485 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 486 ftp_seterr(e); 487 return (-1); 488 } 489 490 e = ftp_cmd(conn, "SIZE %.*s\r\n", filenamelen, filename); 491 if (e != FTP_FILE_STATUS) { 492 ftp_seterr(e); 493 return (-1); 494 } 495 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 496 /* nothing */ ; 497 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 498 us->size = us->size * 10 + *ln - '0'; 499 if (*ln && !isspace((unsigned char)*ln)) { 500 ftp_seterr(FTP_PROTOCOL_ERROR); 501 us->size = -1; 502 return (-1); 503 } 504 if (us->size == 0) 505 us->size = -1; 506 507 e = ftp_cmd(conn, "MDTM %.*s\r\n", filenamelen, filename); 508 if (e != FTP_FILE_STATUS) { 509 ftp_seterr(e); 510 return (-1); 511 } 512 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 513 /* nothing */ ; 514 switch (strspn(ln, "0123456789")) { 515 case 14: 516 break; 517 case 15: 518 ln++; 519 ln[0] = '2'; 520 ln[1] = '0'; 521 break; 522 default: 523 ftp_seterr(FTP_PROTOCOL_ERROR); 524 return (-1); 525 } 526 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 527 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 528 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 529 ftp_seterr(FTP_PROTOCOL_ERROR); 530 return (-1); 531 } 532 tm.tm_mon--; 533 tm.tm_year -= 1900; 534 tm.tm_isdst = -1; 535 t = timegm(&tm); 536 if (t == (time_t)-1) 537 t = time(NULL); 538 us->mtime = t; 539 us->atime = t; 540 541 return (0); 542 } 543 544 /* 545 * I/O functions for FTP 546 */ 547 struct ftpio { 548 conn_t *cconn; /* Control connection */ 549 conn_t *dconn; /* Data connection */ 550 int dir; /* Direction */ 551 int eof; /* EOF reached */ 552 int err; /* Error code */ 553 }; 554 555 static ssize_t ftp_readfn(void *, void *, size_t); 556 static ssize_t ftp_writefn(void *, const void *, size_t); 557 static void ftp_closefn(void *); 558 559 static ssize_t 560 ftp_readfn(void *v, void *buf, size_t len) 561 { 562 struct ftpio *io; 563 ssize_t r; 564 565 io = (struct ftpio *)v; 566 if (io == NULL) { 567 errno = EBADF; 568 return (-1); 569 } 570 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 571 errno = EBADF; 572 return (-1); 573 } 574 if (io->err) { 575 errno = io->err; 576 return (-1); 577 } 578 if (io->eof) 579 return (0); 580 r = fetch_read(io->dconn, buf, len); 581 if (r > 0) 582 return (r); 583 if (r == 0) { 584 io->eof = 1; 585 return (0); 586 } 587 if (errno != EINTR) 588 io->err = errno; 589 return (-1); 590 } 591 592 static ssize_t 593 ftp_writefn(void *v, const void *buf, size_t len) 594 { 595 struct ftpio *io; 596 ssize_t w; 597 598 io = (struct ftpio *)v; 599 if (io == NULL) { 600 errno = EBADF; 601 return (-1); 602 } 603 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 604 errno = EBADF; 605 return (-1); 606 } 607 if (io->err) { 608 errno = io->err; 609 return (-1); 610 } 611 w = fetch_write(io->dconn, buf, len); 612 if (w >= 0) 613 return (w); 614 if (errno != EINTR) 615 io->err = errno; 616 return (-1); 617 } 618 619 static int 620 ftp_disconnect(conn_t *conn) 621 { 622 ftp_cmd(conn, "QUIT\r\n"); 623 return fetch_close(conn); 624 } 625 626 static void 627 ftp_closefn(void *v) 628 { 629 struct ftpio *io; 630 631 io = (struct ftpio *)v; 632 if (io == NULL) { 633 errno = EBADF; 634 return; 635 } 636 if (io->dir == -1) 637 return; 638 if (io->cconn == NULL || io->dconn == NULL) { 639 errno = EBADF; 640 return; 641 } 642 fetch_close(io->dconn); 643 io->dconn = NULL; 644 io->dir = -1; 645 (void)ftp_chkerr(io->cconn); 646 fetch_cache_put(io->cconn, ftp_disconnect); 647 free(io); 648 return; 649 } 650 651 static fetchIO * 652 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 653 { 654 struct ftpio *io; 655 fetchIO *f; 656 657 if (cconn == NULL || dconn == NULL) 658 return (NULL); 659 if ((io = malloc(sizeof(*io))) == NULL) 660 return (NULL); 661 io->cconn = cconn; 662 io->dconn = dconn; 663 io->dir = mode; 664 io->eof = io->err = 0; 665 f = fetchIO_unopen(io, ftp_readfn, ftp_writefn, ftp_closefn); 666 if (f == NULL) 667 free(io); 668 return (f); 669 } 670 671 /* 672 * Transfer file 673 */ 674 static fetchIO * 675 ftp_transfer(conn_t *conn, const char *oper, const char *file, const char *op_arg, 676 int mode, off_t offset, const char *flags) 677 { 678 union anonymous { 679 struct sockaddr_storage ss; 680 struct sockaddr sa; 681 struct sockaddr_in6 sin6; 682 struct sockaddr_in sin4; 683 } u; 684 const char *bindaddr; 685 const char *filename; 686 size_t filenamelen; 687 int type; 688 int low, pasv, verbose; 689 int e, sd = -1; 690 socklen_t l; 691 char *s; 692 fetchIO *df; 693 694 /* check flags */ 695 low = CHECK_FLAG('l'); 696 pasv = !CHECK_FLAG('a'); 697 verbose = CHECK_FLAG('v'); 698 699 /* passive mode */ 700 if (!pasv) 701 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 702 strncasecmp(s, "no", 2) != 0); 703 704 /* isolate filename */ 705 filename = ftp_filename(file, &filenamelen, &type, op_arg != NULL); 706 707 /* set transfer mode and data type */ 708 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 709 goto ouch; 710 711 /* find our own address, bind, and listen */ 712 l = sizeof(u.ss); 713 if (getsockname(conn->sd, &u.sa, &l) == -1) 714 goto sysouch; 715 if (u.ss.ss_family == AF_INET6) 716 unmappedaddr(&u.sin6, &l); 717 718 retry_mode: 719 720 /* open data socket */ 721 if ((sd = socket(u.ss.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 722 fetch_syserr(); 723 return (NULL); 724 } 725 726 if (pasv) { 727 unsigned char addr[64]; 728 char *ln, *p; 729 unsigned int i; 730 int port; 731 732 /* send PASV command */ 733 if (verbose) 734 fetch_info("setting passive mode"); 735 switch (u.ss.ss_family) { 736 case AF_INET: 737 if ((e = ftp_cmd(conn, "PASV\r\n")) != FTP_PASSIVE_MODE) 738 goto ouch; 739 break; 740 case AF_INET6: 741 if ((e = ftp_cmd(conn, "EPSV\r\n")) != FTP_EPASSIVE_MODE) { 742 if (e == -1) 743 goto ouch; 744 if ((e = ftp_cmd(conn, "LPSV\r\n")) != 745 FTP_LPASSIVE_MODE) 746 goto ouch; 747 } 748 break; 749 default: 750 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 751 goto ouch; 752 } 753 754 /* 755 * Find address and port number. The reply to the PASV command 756 * is IMHO the one and only weak point in the FTP protocol. 757 */ 758 ln = conn->buf; 759 switch (e) { 760 case FTP_PASSIVE_MODE: 761 case FTP_LPASSIVE_MODE: 762 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 763 /* nothing */ ; 764 if (!*p) { 765 e = FTP_PROTOCOL_ERROR; 766 goto ouch; 767 } 768 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 769 for (i = 0; *p && i < l; i++, p++) 770 addr[i] = (unsigned char)strtol(p, &p, 10); 771 if (i < l) { 772 e = FTP_PROTOCOL_ERROR; 773 goto ouch; 774 } 775 break; 776 case FTP_EPASSIVE_MODE: 777 for (p = ln + 3; *p && *p != '('; p++) 778 /* nothing */ ; 779 if (!*p) { 780 e = FTP_PROTOCOL_ERROR; 781 goto ouch; 782 } 783 ++p; 784 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 785 &port, &addr[3]) != 5 || 786 addr[0] != addr[1] || 787 addr[0] != addr[2] || addr[0] != addr[3]) { 788 e = FTP_PROTOCOL_ERROR; 789 goto ouch; 790 } 791 break; 792 case FTP_SYNTAX_ERROR: 793 if (verbose) 794 fetch_info("passive mode failed"); 795 /* Close socket and retry with passive mode. */ 796 pasv = 0; 797 close(sd); 798 sd = -1; 799 goto retry_mode; 800 } 801 802 /* seek to required offset */ 803 if (offset) 804 if (ftp_cmd(conn, "REST %lu\r\n", (unsigned long)offset) != FTP_FILE_OK) 805 goto sysouch; 806 807 /* construct sockaddr for data socket */ 808 l = sizeof(u.ss); 809 if (getpeername(conn->sd, &u.sa, &l) == -1) 810 goto sysouch; 811 if (u.ss.ss_family == AF_INET6) 812 unmappedaddr(&u.sin6, &l); 813 switch (u.ss.ss_family) { 814 case AF_INET6: 815 if (e == FTP_EPASSIVE_MODE) 816 u.sin6.sin6_port = htons(port); 817 else { 818 memcpy(&u.sin6.sin6_addr, addr + 2, 16); 819 memcpy(&u.sin6.sin6_port, addr + 19, 2); 820 } 821 break; 822 case AF_INET: 823 if (e == FTP_EPASSIVE_MODE) 824 u.sin4.sin_port = htons(port); 825 else { 826 memcpy(&u.sin4.sin_addr, addr, 4); 827 memcpy(&u.sin4.sin_port, addr + 4, 2); 828 } 829 break; 830 default: 831 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 832 break; 833 } 834 835 /* connect to data port */ 836 if (verbose) 837 fetch_info("opening data connection"); 838 bindaddr = getenv("FETCH_BIND_ADDRESS"); 839 if (bindaddr != NULL && *bindaddr != '\0' && 840 fetch_bind(sd, u.ss.ss_family, bindaddr) != 0) 841 goto sysouch; 842 if (connect(sd, &u.sa, l) == -1) 843 goto sysouch; 844 845 /* make the server initiate the transfer */ 846 if (verbose) 847 fetch_info("initiating transfer"); 848 if (op_arg) 849 e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); 850 else 851 e = ftp_cmd(conn, "%s %.*s\r\n", oper, 852 filenamelen, filename); 853 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 854 goto ouch; 855 856 } else { 857 uint32_t a; 858 uint16_t p; 859 #if defined(IPV6_PORTRANGE) || defined(IP_PORTRANGE) 860 int arg; 861 #endif 862 int d; 863 char hname[INET6_ADDRSTRLEN]; 864 865 switch (u.ss.ss_family) { 866 case AF_INET6: 867 u.sin6.sin6_port = 0; 868 #ifdef IPV6_PORTRANGE 869 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 870 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 871 &arg, (socklen_t)sizeof(arg)) == -1) 872 goto sysouch; 873 #endif 874 break; 875 case AF_INET: 876 u.sin4.sin_port = 0; 877 #ifdef IP_PORTRANGE 878 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 879 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 880 &arg, (socklen_t)sizeof(arg)) == -1) 881 goto sysouch; 882 #endif 883 break; 884 } 885 if (verbose) 886 fetch_info("binding data socket"); 887 if (bind(sd, &u.sa, l) == -1) 888 goto sysouch; 889 if (listen(sd, 1) == -1) 890 goto sysouch; 891 892 /* find what port we're on and tell the server */ 893 if (getsockname(sd, &u.sa, &l) == -1) 894 goto sysouch; 895 switch (u.ss.ss_family) { 896 case AF_INET: 897 a = ntohl(u.sin4.sin_addr.s_addr); 898 p = ntohs(u.sin4.sin_port); 899 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d\r\n", 900 (a >> 24) & 0xff, (a >> 16) & 0xff, 901 (a >> 8) & 0xff, a & 0xff, 902 ((unsigned int)p >> 8) & 0xff, p & 0xff); 903 break; 904 case AF_INET6: 905 e = -1; 906 u.sin6.sin6_scope_id = 0; 907 if (getnameinfo(&u.sa, l, 908 hname, (socklen_t)sizeof(hname), 909 NULL, 0, NI_NUMERICHOST) == 0) { 910 e = ftp_cmd(conn, "EPRT |%d|%s|%d|\r\n", 2, hname, 911 htons(u.sin6.sin6_port)); 912 if (e == -1) 913 goto ouch; 914 } 915 if (e != FTP_OK) { 916 uint8_t aa[sizeof(u.sin6.sin6_addr)]; 917 memcpy(aa, &u.sin6.sin6_addr, sizeof(aa)); 918 p = ntohs(u.sin6.sin6_port); 919 e = ftp_cmd(conn, 920 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d\r\n", 921 6, 16, 922 aa[ 0], aa[ 1], aa[ 2], aa[ 3], 923 aa[ 4], aa[ 5], aa[ 6], aa[ 7], 924 aa[ 8], aa[ 9], aa[10], aa[11], 925 aa[12], aa[13], aa[14], aa[15], 926 2, 927 ((unsigned int)p >> 8) & 0xff, p & 0xff); 928 } 929 break; 930 default: 931 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 932 goto ouch; 933 } 934 if (e != FTP_OK) 935 goto ouch; 936 937 /* seek to required offset */ 938 if (offset) 939 if (ftp_cmd(conn, "REST %llu\r\n", (unsigned long long)offset) != FTP_FILE_OK) 940 goto sysouch; 941 942 /* make the server initiate the transfer */ 943 if (verbose) 944 fetch_info("initiating transfer"); 945 if (op_arg) 946 e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); 947 else 948 e = ftp_cmd(conn, "%s %.*s\r\n", oper, 949 filenamelen, filename); 950 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 951 goto ouch; 952 953 /* accept the incoming connection and go to town */ 954 if ((d = accept(sd, NULL, NULL)) == -1) 955 goto sysouch; 956 close(sd); 957 sd = d; 958 } 959 960 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 961 goto sysouch; 962 return (df); 963 964 sysouch: 965 fetch_syserr(); 966 if (sd >= 0) 967 close(sd); 968 return (NULL); 969 970 ouch: 971 if (e != -1) 972 ftp_seterr(e); 973 if (sd >= 0) 974 close(sd); 975 return (NULL); 976 } 977 978 /* 979 * Authenticate 980 */ 981 static int 982 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 983 { 984 const char *user, *pwd, *login_name; 985 char pbuf[URL_USERLEN + 1 + URL_HOSTLEN + 1]; 986 int e, len; 987 988 /* XXX FTP_AUTH, and maybe .netrc */ 989 990 /* send user name and password */ 991 if (url->user[0] == '\0') 992 fetch_netrc_auth(url); 993 user = url->user; 994 if (*user == '\0') 995 user = getenv("FTP_LOGIN"); 996 if (user == NULL || *user == '\0') 997 user = FTP_ANONYMOUS_USER; 998 if (purl && url->port == fetch_default_port(url->scheme)) 999 e = ftp_cmd(conn, "USER %s@%s\r\n", user, url->host); 1000 else if (purl) 1001 e = ftp_cmd(conn, "USER %s@%s@%d\r\n", user, url->host, url->port); 1002 else 1003 e = ftp_cmd(conn, "USER %s\r\n", user); 1004 1005 /* did the server request a password? */ 1006 if (e == FTP_NEED_PASSWORD) { 1007 pwd = url->pwd; 1008 if (*pwd == '\0') 1009 pwd = getenv("FTP_PASSWORD"); 1010 if (pwd == NULL || *pwd == '\0') { 1011 if ((login_name = getlogin()) == 0) 1012 login_name = FTP_ANONYMOUS_USER; 1013 if ((len = snprintf(pbuf, URL_USERLEN + 2, "%s@", login_name)) < 0) 1014 len = 0; 1015 else if (len > URL_USERLEN + 1) 1016 len = URL_USERLEN + 1; 1017 gethostname(pbuf + len, sizeof(pbuf) - len); 1018 /* MAXHOSTNAMELEN can differ from URL_HOSTLEN + 1 */ 1019 pbuf[sizeof(pbuf) - 1] = '\0'; 1020 pwd = pbuf; 1021 } 1022 e = ftp_cmd(conn, "PASS %s\r\n", pwd); 1023 } 1024 1025 return (e); 1026 } 1027 1028 /* 1029 * Log on to FTP server 1030 */ 1031 static conn_t * 1032 ftp_connect(struct url *url, struct url *purl, const char *flags) 1033 { 1034 conn_t *conn; 1035 int e, direct, verbose; 1036 #ifdef INET6 1037 int af = AF_UNSPEC; 1038 #else 1039 int af = AF_INET; 1040 #endif 1041 1042 direct = CHECK_FLAG('d'); 1043 verbose = CHECK_FLAG('v'); 1044 if (CHECK_FLAG('4')) 1045 af = AF_INET; 1046 else if (CHECK_FLAG('6')) 1047 af = AF_INET6; 1048 1049 if (direct) 1050 purl = NULL; 1051 1052 /* check for proxy */ 1053 if (purl) { 1054 /* XXX proxy authentication! */ 1055 /* XXX connetion caching */ 1056 if (!purl->port) 1057 purl->port = fetch_default_port(purl->scheme); 1058 1059 conn = fetch_connect(purl, af, verbose); 1060 } else { 1061 /* no proxy, go straight to target */ 1062 if (!url->port) 1063 url->port = fetch_default_port(url->scheme); 1064 1065 while ((conn = fetch_cache_get(url, af)) != NULL) { 1066 e = ftp_cmd(conn, "NOOP\r\n"); 1067 if (e == FTP_OK) 1068 return conn; 1069 fetch_close(conn); 1070 } 1071 conn = fetch_connect(url, af, verbose); 1072 purl = NULL; 1073 } 1074 1075 /* check connection */ 1076 if (conn == NULL) 1077 /* fetch_connect() has already set an error code */ 1078 return (NULL); 1079 1080 /* expect welcome message */ 1081 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 1082 goto fouch; 1083 1084 /* authenticate */ 1085 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 1086 goto fouch; 1087 1088 /* TODO: Request extended features supported, if any (RFC 3659). */ 1089 1090 /* done */ 1091 return (conn); 1092 1093 fouch: 1094 if (e != -1) 1095 ftp_seterr(e); 1096 fetch_close(conn); 1097 return (NULL); 1098 } 1099 1100 /* 1101 * Check the proxy settings 1102 */ 1103 static struct url * 1104 ftp_get_proxy(struct url * url, const char *flags) 1105 { 1106 struct url *purl; 1107 char *p, *fp, *FP, *hp, *HP; 1108 1109 if (flags != NULL && strchr(flags, 'd') != NULL) 1110 return NULL; 1111 if (fetch_no_proxy_match(url->host)) 1112 return NULL; 1113 1114 FP = getenv("FTP_PROXY"); 1115 fp = getenv("ftp_proxy"); 1116 HP = getenv("HTTP_PROXY"); 1117 hp = getenv("http_proxy"); 1118 1119 if ((((p = FP) || (p = fp) || (p = HP) || (p = hp))) && 1120 *p && (purl = fetchParseURL(p)) != NULL) { 1121 if (!*purl->scheme) { 1122 if (fp || FP) 1123 strcpy(purl->scheme, SCHEME_FTP); 1124 else 1125 strcpy(purl->scheme, SCHEME_HTTP); 1126 } 1127 if (!purl->port) 1128 purl->port = fetch_default_proxy_port(purl->scheme); 1129 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1130 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1131 return purl; 1132 fetchFreeURL(purl); 1133 } 1134 return NULL; 1135 } 1136 1137 /* 1138 * Process an FTP request 1139 */ 1140 fetchIO * 1141 ftp_request(struct url *url, const char *op, const char *op_arg, 1142 struct url_stat *us, struct url *purl, const char *flags) 1143 { 1144 fetchIO *f; 1145 char *path; 1146 conn_t *conn; 1147 int if_modified_since, oflag; 1148 struct url_stat local_us; 1149 1150 /* check if we should use HTTP instead */ 1151 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1152 if (strcmp(op, "STAT") == 0) 1153 return (http_request(url, "HEAD", us, purl, flags)); 1154 else if (strcmp(op, "RETR") == 0) 1155 return (http_request(url, "GET", us, purl, flags)); 1156 /* 1157 * Our HTTP code doesn't support PUT requests yet, so try 1158 * a direct connection. 1159 */ 1160 } 1161 1162 /* connect to server */ 1163 conn = ftp_connect(url, purl, flags); 1164 if (purl) 1165 fetchFreeURL(purl); 1166 if (conn == NULL) 1167 return (NULL); 1168 1169 if ((path = fetchUnquotePath(url)) == NULL) { 1170 fetch_syserr(); 1171 return NULL; 1172 } 1173 1174 /* change directory */ 1175 if (ftp_cwd(conn, path, op_arg != NULL) == -1) { 1176 free(path); 1177 return (NULL); 1178 } 1179 1180 if_modified_since = CHECK_FLAG('i'); 1181 if (if_modified_since && us == NULL) 1182 us = &local_us; 1183 1184 /* stat file */ 1185 if (us && ftp_stat(conn, path, us) == -1 1186 && fetchLastErrCode != FETCH_PROTO 1187 && fetchLastErrCode != FETCH_UNAVAIL) { 1188 free(path); 1189 return (NULL); 1190 } 1191 1192 if (if_modified_since && url->last_modified > 0 && 1193 url->last_modified >= us->mtime) { 1194 free(path); 1195 fetchLastErrCode = FETCH_UNCHANGED; 1196 snprintf(fetchLastErrString, MAXERRSTRING, "Unchanged"); 1197 return NULL; 1198 } 1199 1200 /* just a stat */ 1201 if (strcmp(op, "STAT") == 0) { 1202 free(path); 1203 return fetchIO_unopen(NULL, NULL, NULL, NULL); 1204 } 1205 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1206 oflag = O_WRONLY; 1207 else 1208 oflag = O_RDONLY; 1209 1210 /* initiate the transfer */ 1211 f = (ftp_transfer(conn, op, path, op_arg, oflag, url->offset, flags)); 1212 free(path); 1213 return f; 1214 } 1215 1216 /* 1217 * Get and stat file 1218 */ 1219 fetchIO * 1220 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1221 { 1222 return (ftp_request(url, "RETR", NULL, us, ftp_get_proxy(url, flags), flags)); 1223 } 1224 1225 /* 1226 * Get file 1227 */ 1228 fetchIO * 1229 fetchGetFTP(struct url *url, const char *flags) 1230 { 1231 return (fetchXGetFTP(url, NULL, flags)); 1232 } 1233 1234 /* 1235 * Put file 1236 */ 1237 fetchIO * 1238 fetchPutFTP(struct url *url, const char *flags) 1239 { 1240 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, NULL, 1241 ftp_get_proxy(url, flags), flags)); 1242 } 1243 1244 /* 1245 * Get file stats 1246 */ 1247 int 1248 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1249 { 1250 fetchIO *f; 1251 1252 f = ftp_request(url, "STAT", NULL, us, ftp_get_proxy(url, flags), flags); 1253 if (f == NULL) 1254 return (-1); 1255 fetchIO_close(f); 1256 return (0); 1257 } 1258 1259 /* 1260 * List a directory 1261 */ 1262 int 1263 fetchListFTP(struct url_list *ue, struct url *url, const char *pattern, const char *flags) 1264 { 1265 fetchIO *f; 1266 char buf[2 * PATH_MAX], *eol, *eos; 1267 ssize_t len; 1268 size_t cur_off; 1269 int ret; 1270 1271 /* XXX What about proxies? */ 1272 if (pattern == NULL || strcmp(pattern, "*") == 0) 1273 pattern = ""; 1274 f = ftp_request(url, "NLST", pattern, NULL, ftp_get_proxy(url, flags), flags); 1275 if (f == NULL) 1276 return -1; 1277 1278 cur_off = 0; 1279 ret = 0; 1280 1281 while ((len = fetchIO_read(f, buf + cur_off, sizeof(buf) - cur_off)) > 0) { 1282 cur_off += len; 1283 while ((eol = memchr(buf, '\n', cur_off)) != NULL) { 1284 if (len == eol - buf) 1285 break; 1286 if (eol != buf) { 1287 if (eol[-1] == '\r') 1288 eos = eol - 1; 1289 else 1290 eos = eol; 1291 *eos = '\0'; 1292 ret = fetch_add_entry(ue, url, buf, 0); 1293 if (ret) 1294 break; 1295 cur_off -= eol - buf + 1; 1296 memmove(buf, eol + 1, cur_off); 1297 } 1298 } 1299 if (ret) 1300 break; 1301 } 1302 if (cur_off != 0 || len < 0) { 1303 /* Not RFC conform, bail out. */ 1304 fetchIO_close(f); 1305 return -1; 1306 } 1307 fetchIO_close(f); 1308 return ret; 1309 } 1310