1 /* $NetBSD: ftp.c,v 1.1.1.8 2009/10/15 12:59:59 joerg Exp $ */ 2 /*- 3 * Copyright (c) 1998-2004 Dag-Erling Co�dan Sm�rgrav 4 * Copyright (c) 2008, 2009 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 static struct url cached_host; 124 static conn_t *cached_connection; 125 126 #define isftpreply(foo) \ 127 (isdigit((unsigned char)foo[0]) && \ 128 isdigit((unsigned char)foo[1]) && \ 129 isdigit((unsigned char)foo[2]) && \ 130 (foo[3] == ' ' || foo[3] == '\0')) 131 #define isftpinfo(foo) \ 132 (isdigit((unsigned char)foo[0]) && \ 133 isdigit((unsigned char)foo[1]) && \ 134 isdigit((unsigned char)foo[2]) && \ 135 foo[3] == '-') 136 137 /* 138 * Translate IPv4 mapped IPv6 address to IPv4 address 139 */ 140 static void 141 unmappedaddr(struct sockaddr_in6 *sin6, socklen_t *len) 142 { 143 struct sockaddr_in *sin4; 144 uint32_t addr; 145 int port; 146 147 if (sin6->sin6_family != AF_INET6 || 148 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 149 return; 150 sin4 = (struct sockaddr_in *)sin6; 151 addr = *(uint32_t *)&sin6->sin6_addr.s6_addr[12]; 152 port = sin6->sin6_port; 153 memset(sin4, 0, sizeof(struct sockaddr_in)); 154 sin4->sin_addr.s_addr = addr; 155 sin4->sin_port = port; 156 sin4->sin_family = AF_INET; 157 *len = sizeof(struct sockaddr_in); 158 #ifdef HAVE_SA_LEN 159 sin4->sin_len = sizeof(struct sockaddr_in); 160 #endif 161 } 162 163 /* 164 * Get server response 165 */ 166 static int 167 ftp_chkerr(conn_t *conn) 168 { 169 if (fetch_getln(conn) == -1) { 170 fetch_syserr(); 171 return (-1); 172 } 173 if (isftpinfo(conn->buf)) { 174 while (conn->buflen && !isftpreply(conn->buf)) { 175 if (fetch_getln(conn) == -1) { 176 fetch_syserr(); 177 return (-1); 178 } 179 } 180 } 181 182 while (conn->buflen && 183 isspace((unsigned char)conn->buf[conn->buflen - 1])) 184 conn->buflen--; 185 conn->buf[conn->buflen] = '\0'; 186 187 if (!isftpreply(conn->buf)) { 188 ftp_seterr(FTP_PROTOCOL_ERROR); 189 return (-1); 190 } 191 192 conn->err = (conn->buf[0] - '0') * 100 193 + (conn->buf[1] - '0') * 10 194 + (conn->buf[2] - '0'); 195 196 return (conn->err); 197 } 198 199 /* 200 * Send a command and check reply 201 */ 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 int 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_putln(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, int *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, size_t pwdlen) 259 { 260 char *src, *dst, *end; 261 int q; 262 263 if (conn->err != FTP_WORKING_DIRECTORY && 264 conn->err != FTP_FILE_ACTION_OK) 265 return (FTP_PROTOCOL_ERROR); 266 end = conn->buf + conn->buflen; 267 src = conn->buf + 4; 268 if (src >= end || *src++ != '"') 269 return (FTP_PROTOCOL_ERROR); 270 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { 271 if (!q && *src == '"') 272 q = 1; 273 else if (q && *src != '"') 274 break; 275 else if (q) 276 *dst++ = '"', q = 0; 277 else 278 *dst++ = *src; 279 } 280 if (!pwdlen) 281 return (FTP_PROTOCOL_ERROR); 282 *dst = '\0'; 283 return (FTP_OK); 284 } 285 286 /* 287 * Change working directory to the directory that contains the specified 288 * file. 289 */ 290 static int 291 ftp_cwd(conn_t *conn, const char *file, int subdir) 292 { 293 const char *beg, *end; 294 char pwd[PATH_MAX]; 295 int e, i, len; 296 297 /* If no slashes in name, no need to change dirs. */ 298 if (subdir) 299 end = file + strlen(file); 300 else if ((end = strrchr(file, '/')) == NULL) 301 return (0); 302 if ((e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 303 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 304 ftp_seterr(e); 305 return (-1); 306 } 307 for (;;) { 308 len = strlen(pwd); 309 310 /* Look for a common prefix between PWD and dir to fetch. */ 311 for (i = 0; i <= len && i <= end - file; ++i) 312 if (pwd[i] != file[i]) 313 break; 314 /* Keep going up a dir until we have a matching prefix. */ 315 if (strcmp(pwd, "/") == 0) 316 break; 317 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) 318 break; 319 if ((e = ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || 320 (e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 321 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 322 ftp_seterr(e); 323 return (-1); 324 } 325 } 326 327 #ifdef FTP_COMBINE_CWDS 328 /* Skip leading slashes, even "////". */ 329 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) 330 /* nothing */ ; 331 332 /* If there is no trailing dir, we're already there. */ 333 if (beg >= end) 334 return (0); 335 336 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 337 e = ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); 338 if (e == FTP_FILE_ACTION_OK) 339 return (0); 340 #endif /* FTP_COMBINE_CWDS */ 341 342 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 343 for (beg = file + i; beg < end; beg = file + i + 1) { 344 while (*beg == '/') 345 ++beg, ++i; 346 for (++i; file + i < end && file[i] != '/'; ++i) 347 /* nothing */ ; 348 e = ftp_cmd(conn, "CWD %.*s", file + i - beg, beg); 349 if (e != FTP_FILE_ACTION_OK) { 350 ftp_seterr(e); 351 return (-1); 352 } 353 } 354 return (0); 355 } 356 357 /* 358 * Set transfer mode and data type 359 */ 360 static int 361 ftp_mode_type(conn_t *conn, int mode, int type) 362 { 363 int e; 364 365 switch (mode) { 366 case 0: 367 case 's': 368 mode = 'S'; 369 case 'S': 370 break; 371 default: 372 return (FTP_PROTOCOL_ERROR); 373 } 374 if ((e = ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { 375 if (mode == 'S') { 376 /* 377 * Stream mode is supposed to be the default - so 378 * much so that some servers not only do not 379 * support any other mode, but do not support the 380 * MODE command at all. 381 * 382 * If "MODE S" fails, it is unlikely that we 383 * previously succeeded in setting a different 384 * mode. Therefore, we simply hope that the 385 * server is already in the correct mode, and 386 * silently ignore the failure. 387 */ 388 } else { 389 return (e); 390 } 391 } 392 393 switch (type) { 394 case 0: 395 case 'i': 396 type = 'I'; 397 case 'I': 398 break; 399 case 'a': 400 type = 'A'; 401 case 'A': 402 break; 403 case 'd': 404 type = 'D'; 405 case 'D': 406 /* can't handle yet */ 407 default: 408 return (FTP_PROTOCOL_ERROR); 409 } 410 if ((e = ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) 411 return (e); 412 413 return (FTP_OK); 414 } 415 416 /* 417 * Request and parse file stats 418 */ 419 static int 420 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 421 { 422 char *ln; 423 const char *filename; 424 int filenamelen, type; 425 struct tm tm; 426 time_t t; 427 int e; 428 429 us->size = -1; 430 us->atime = us->mtime = 0; 431 432 filename = ftp_filename(file, &filenamelen, &type, 0); 433 434 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 435 ftp_seterr(e); 436 return (-1); 437 } 438 439 e = ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); 440 if (e != FTP_FILE_STATUS) { 441 ftp_seterr(e); 442 return (-1); 443 } 444 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 445 /* nothing */ ; 446 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 447 us->size = us->size * 10 + *ln - '0'; 448 if (*ln && !isspace((unsigned char)*ln)) { 449 ftp_seterr(FTP_PROTOCOL_ERROR); 450 us->size = -1; 451 return (-1); 452 } 453 if (us->size == 0) 454 us->size = -1; 455 456 e = ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); 457 if (e != FTP_FILE_STATUS) { 458 ftp_seterr(e); 459 return (-1); 460 } 461 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 462 /* nothing */ ; 463 switch (strspn(ln, "0123456789")) { 464 case 14: 465 break; 466 case 15: 467 ln++; 468 ln[0] = '2'; 469 ln[1] = '0'; 470 break; 471 default: 472 ftp_seterr(FTP_PROTOCOL_ERROR); 473 return (-1); 474 } 475 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 476 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 477 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 478 ftp_seterr(FTP_PROTOCOL_ERROR); 479 return (-1); 480 } 481 tm.tm_mon--; 482 tm.tm_year -= 1900; 483 tm.tm_isdst = -1; 484 t = timegm(&tm); 485 if (t == (time_t)-1) 486 t = time(NULL); 487 us->mtime = t; 488 us->atime = t; 489 490 return (0); 491 } 492 493 /* 494 * I/O functions for FTP 495 */ 496 struct ftpio { 497 conn_t *cconn; /* Control connection */ 498 conn_t *dconn; /* Data connection */ 499 int dir; /* Direction */ 500 int eof; /* EOF reached */ 501 int err; /* Error code */ 502 }; 503 504 static ssize_t ftp_readfn(void *, void *, size_t); 505 static ssize_t ftp_writefn(void *, const void *, size_t); 506 static void ftp_closefn(void *); 507 508 static ssize_t 509 ftp_readfn(void *v, void *buf, size_t len) 510 { 511 struct ftpio *io; 512 int r; 513 514 io = (struct ftpio *)v; 515 if (io == NULL) { 516 errno = EBADF; 517 return (-1); 518 } 519 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 520 errno = EBADF; 521 return (-1); 522 } 523 if (io->err) { 524 errno = io->err; 525 return (-1); 526 } 527 if (io->eof) 528 return (0); 529 r = fetch_read(io->dconn, buf, len); 530 if (r > 0) 531 return (r); 532 if (r == 0) { 533 io->eof = 1; 534 return (0); 535 } 536 if (errno != EINTR) 537 io->err = errno; 538 return (-1); 539 } 540 541 static ssize_t 542 ftp_writefn(void *v, const void *buf, size_t len) 543 { 544 struct ftpio *io; 545 int w; 546 547 io = (struct ftpio *)v; 548 if (io == NULL) { 549 errno = EBADF; 550 return (-1); 551 } 552 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 553 errno = EBADF; 554 return (-1); 555 } 556 if (io->err) { 557 errno = io->err; 558 return (-1); 559 } 560 w = fetch_write(io->dconn, buf, len); 561 if (w >= 0) 562 return (w); 563 if (errno != EINTR) 564 io->err = errno; 565 return (-1); 566 } 567 568 static void 569 ftp_closefn(void *v) 570 { 571 struct ftpio *io; 572 int r; 573 574 io = (struct ftpio *)v; 575 if (io == NULL) { 576 errno = EBADF; 577 return; 578 } 579 if (io->dir == -1) 580 return; 581 if (io->cconn == NULL || io->dconn == NULL) { 582 errno = EBADF; 583 return; 584 } 585 fetch_close(io->dconn); 586 io->dir = -1; 587 io->dconn->is_active = 0; 588 io->dconn = NULL; 589 r = ftp_chkerr(io->cconn); 590 if (io->cconn == cached_connection && io->cconn->ref == 1) { 591 free(cached_host.doc); 592 cached_connection = NULL; 593 } 594 fetch_close(io->cconn); 595 free(io); 596 return; 597 } 598 599 static fetchIO * 600 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 601 { 602 struct ftpio *io; 603 fetchIO *f; 604 605 if (cconn == NULL || dconn == NULL) 606 return (NULL); 607 if ((io = malloc(sizeof(*io))) == NULL) 608 return (NULL); 609 io->cconn = cconn; 610 io->dconn = dconn; 611 io->dir = mode; 612 io->eof = io->err = 0; 613 io->cconn->is_active = 1; 614 f = fetchIO_unopen(io, ftp_readfn, ftp_writefn, ftp_closefn); 615 if (f == NULL) 616 free(io); 617 return (f); 618 } 619 620 /* 621 * Transfer file 622 */ 623 static fetchIO * 624 ftp_transfer(conn_t *conn, const char *oper, const char *file, const char *op_arg, 625 int mode, off_t offset, const char *flags) 626 { 627 union anonymous { 628 struct sockaddr_storage ss; 629 struct sockaddr sa; 630 struct sockaddr_in6 sin6; 631 struct sockaddr_in sin4; 632 } u; 633 const char *bindaddr; 634 const char *filename; 635 int filenamelen, type; 636 int low, pasv, verbose; 637 int e, sd = -1; 638 socklen_t l; 639 char *s; 640 fetchIO *df; 641 642 /* check flags */ 643 low = CHECK_FLAG('l'); 644 pasv = !CHECK_FLAG('a'); 645 verbose = CHECK_FLAG('v'); 646 647 /* passive mode */ 648 if (!pasv) 649 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 650 strncasecmp(s, "no", 2) != 0); 651 652 /* isolate filename */ 653 filename = ftp_filename(file, &filenamelen, &type, op_arg != NULL); 654 655 /* set transfer mode and data type */ 656 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 657 goto ouch; 658 659 /* find our own address, bind, and listen */ 660 l = sizeof(u.ss); 661 if (getsockname(conn->sd, &u.sa, &l) == -1) 662 goto sysouch; 663 if (u.ss.ss_family == AF_INET6) 664 unmappedaddr(&u.sin6, &l); 665 666 retry_mode: 667 668 /* open data socket */ 669 if ((sd = socket(u.ss.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 670 fetch_syserr(); 671 return (NULL); 672 } 673 674 if (pasv) { 675 unsigned char addr[64]; 676 char *ln, *p; 677 unsigned int i; 678 int port; 679 680 /* send PASV command */ 681 if (verbose) 682 fetch_info("setting passive mode"); 683 switch (u.ss.ss_family) { 684 case AF_INET: 685 if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 686 goto ouch; 687 break; 688 case AF_INET6: 689 if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 690 if (e == -1) 691 goto ouch; 692 if ((e = ftp_cmd(conn, "LPSV")) != 693 FTP_LPASSIVE_MODE) 694 goto ouch; 695 } 696 break; 697 default: 698 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 699 goto ouch; 700 } 701 702 /* 703 * Find address and port number. The reply to the PASV command 704 * is IMHO the one and only weak point in the FTP protocol. 705 */ 706 ln = conn->buf; 707 switch (e) { 708 case FTP_PASSIVE_MODE: 709 case FTP_LPASSIVE_MODE: 710 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 711 /* nothing */ ; 712 if (!*p) { 713 e = FTP_PROTOCOL_ERROR; 714 goto ouch; 715 } 716 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 717 for (i = 0; *p && i < l; i++, p++) 718 addr[i] = strtol(p, &p, 10); 719 if (i < l) { 720 e = FTP_PROTOCOL_ERROR; 721 goto ouch; 722 } 723 break; 724 case FTP_EPASSIVE_MODE: 725 for (p = ln + 3; *p && *p != '('; p++) 726 /* nothing */ ; 727 if (!*p) { 728 e = FTP_PROTOCOL_ERROR; 729 goto ouch; 730 } 731 ++p; 732 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 733 &port, &addr[3]) != 5 || 734 addr[0] != addr[1] || 735 addr[0] != addr[2] || addr[0] != addr[3]) { 736 e = FTP_PROTOCOL_ERROR; 737 goto ouch; 738 } 739 break; 740 case FTP_SYNTAX_ERROR: 741 if (verbose) 742 fetch_info("passive mode failed"); 743 /* Close socket and retry with passive mode. */ 744 pasv = 0; 745 close(sd); 746 sd = -1; 747 goto retry_mode; 748 } 749 750 /* seek to required offset */ 751 if (offset) 752 if (ftp_cmd(conn, "REST %lu", (unsigned long)offset) != FTP_FILE_OK) 753 goto sysouch; 754 755 /* construct sockaddr for data socket */ 756 l = sizeof(u.ss); 757 if (getpeername(conn->sd, &u.sa, &l) == -1) 758 goto sysouch; 759 if (u.ss.ss_family == AF_INET6) 760 unmappedaddr(&u.sin6, &l); 761 switch (u.ss.ss_family) { 762 case AF_INET6: 763 if (e == FTP_EPASSIVE_MODE) 764 u.sin6.sin6_port = htons(port); 765 else { 766 memcpy(&u.sin6.sin6_addr, addr + 2, 16); 767 memcpy(&u.sin6.sin6_port, addr + 19, 2); 768 } 769 break; 770 case AF_INET: 771 if (e == FTP_EPASSIVE_MODE) 772 u.sin4.sin_port = htons(port); 773 else { 774 memcpy(&u.sin4.sin_addr, addr, 4); 775 memcpy(&u.sin4.sin_port, addr + 4, 2); 776 } 777 break; 778 default: 779 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 780 break; 781 } 782 783 /* connect to data port */ 784 if (verbose) 785 fetch_info("opening data connection"); 786 bindaddr = getenv("FETCH_BIND_ADDRESS"); 787 if (bindaddr != NULL && *bindaddr != '\0' && 788 fetch_bind(sd, u.ss.ss_family, bindaddr) != 0) 789 goto sysouch; 790 if (connect(sd, &u.sa, l) == -1) 791 goto sysouch; 792 793 /* make the server initiate the transfer */ 794 if (verbose) 795 fetch_info("initiating transfer"); 796 if (op_arg) 797 e = ftp_cmd(conn, "%s%s%s", oper, *op_arg ? " " : "", op_arg); 798 else 799 e = ftp_cmd(conn, "%s %.*s", oper, 800 filenamelen, filename); 801 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 802 goto ouch; 803 804 } else { 805 uint32_t a; 806 uint16_t p; 807 #if defined(IPV6_PORTRANGE) || defined(IP_PORTRANGE) 808 int arg; 809 #endif 810 int d; 811 char *ap; 812 char hname[INET6_ADDRSTRLEN]; 813 814 switch (u.ss.ss_family) { 815 case AF_INET6: 816 u.sin6.sin6_port = 0; 817 #ifdef IPV6_PORTRANGE 818 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 819 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 820 (char *)&arg, sizeof(arg)) == -1) 821 goto sysouch; 822 #endif 823 break; 824 case AF_INET: 825 u.sin4.sin_port = 0; 826 #ifdef IP_PORTRANGE 827 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 828 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 829 (char *)&arg, sizeof(arg)) == -1) 830 goto sysouch; 831 #endif 832 break; 833 } 834 if (verbose) 835 fetch_info("binding data socket"); 836 if (bind(sd, &u.sa, l) == -1) 837 goto sysouch; 838 if (listen(sd, 1) == -1) 839 goto sysouch; 840 841 /* find what port we're on and tell the server */ 842 if (getsockname(sd, &u.sa, &l) == -1) 843 goto sysouch; 844 switch (u.ss.ss_family) { 845 case AF_INET: 846 a = ntohl(u.sin4.sin_addr.s_addr); 847 p = ntohs(u.sin4.sin_port); 848 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 849 (a >> 24) & 0xff, (a >> 16) & 0xff, 850 (a >> 8) & 0xff, a & 0xff, 851 (p >> 8) & 0xff, p & 0xff); 852 break; 853 case AF_INET6: 854 #define UC(b) (((int)b)&0xff) 855 e = -1; 856 u.sin6.sin6_scope_id = 0; 857 if (getnameinfo(&u.sa, l, 858 hname, sizeof(hname), 859 NULL, 0, NI_NUMERICHOST) == 0) { 860 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 861 htons(u.sin6.sin6_port)); 862 if (e == -1) 863 goto ouch; 864 } 865 if (e != FTP_OK) { 866 ap = (char *)&u.sin6.sin6_addr; 867 e = ftp_cmd(conn, 868 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 869 6, 16, 870 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 871 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 872 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 873 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 874 2, 875 (ntohs(u.sin6.sin6_port) >> 8) & 0xff, 876 ntohs(u.sin6.sin6_port) & 0xff); 877 } 878 break; 879 default: 880 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 881 goto ouch; 882 } 883 if (e != FTP_OK) 884 goto ouch; 885 886 /* seek to required offset */ 887 if (offset) 888 if (ftp_cmd(conn, "REST %llu", (unsigned long long)offset) != FTP_FILE_OK) 889 goto sysouch; 890 891 /* make the server initiate the transfer */ 892 if (verbose) 893 fetch_info("initiating transfer"); 894 if (op_arg) 895 e = ftp_cmd(conn, "%s%s%s", oper, *op_arg ? " " : "", op_arg); 896 else 897 e = ftp_cmd(conn, "%s %.*s", oper, 898 filenamelen, filename); 899 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 900 goto ouch; 901 902 /* accept the incoming connection and go to town */ 903 if ((d = accept(sd, NULL, NULL)) == -1) 904 goto sysouch; 905 close(sd); 906 sd = d; 907 } 908 909 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 910 goto sysouch; 911 return (df); 912 913 sysouch: 914 fetch_syserr(); 915 if (sd >= 0) 916 close(sd); 917 return (NULL); 918 919 ouch: 920 if (e != -1) 921 ftp_seterr(e); 922 if (sd >= 0) 923 close(sd); 924 return (NULL); 925 } 926 927 /* 928 * Authenticate 929 */ 930 static int 931 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 932 { 933 const char *user, *pwd, *login_name; 934 char pbuf[URL_USERLEN + 1 + URL_HOSTLEN + 1]; 935 int e, len; 936 937 /* XXX FTP_AUTH, and maybe .netrc */ 938 939 /* send user name and password */ 940 if (url->user[0] == '\0') 941 fetch_netrc_auth(url); 942 user = url->user; 943 if (*user == '\0') 944 user = getenv("FTP_LOGIN"); 945 if (user == NULL || *user == '\0') 946 user = FTP_ANONYMOUS_USER; 947 if (purl && url->port == fetch_default_port(url->scheme)) 948 e = ftp_cmd(conn, "USER %s@%s", user, url->host); 949 else if (purl) 950 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 951 else 952 e = ftp_cmd(conn, "USER %s", user); 953 954 /* did the server request a password? */ 955 if (e == FTP_NEED_PASSWORD) { 956 pwd = url->pwd; 957 if (*pwd == '\0') 958 pwd = getenv("FTP_PASSWORD"); 959 if (pwd == NULL || *pwd == '\0') { 960 if ((login_name = getlogin()) == 0) 961 login_name = FTP_ANONYMOUS_USER; 962 if ((len = snprintf(pbuf, URL_USERLEN + 2, "%s@", login_name)) < 0) 963 len = 0; 964 else if (len > URL_USERLEN + 1) 965 len = URL_USERLEN + 1; 966 gethostname(pbuf + len, sizeof(pbuf) - len); 967 /* MAXHOSTNAMELEN can differ from URL_HOSTLEN + 1 */ 968 pbuf[sizeof(pbuf) - 1] = '\0'; 969 pwd = pbuf; 970 } 971 e = ftp_cmd(conn, "PASS %s", pwd); 972 } 973 974 return (e); 975 } 976 977 /* 978 * Log on to FTP server 979 */ 980 static conn_t * 981 ftp_connect(struct url *url, struct url *purl, const char *flags) 982 { 983 conn_t *conn; 984 int e, direct, verbose; 985 #ifdef INET6 986 int af = AF_UNSPEC; 987 #else 988 int af = AF_INET; 989 #endif 990 991 direct = CHECK_FLAG('d'); 992 verbose = CHECK_FLAG('v'); 993 if (CHECK_FLAG('4')) 994 af = AF_INET; 995 else if (CHECK_FLAG('6')) 996 af = AF_INET6; 997 998 if (direct) 999 purl = NULL; 1000 1001 /* check for proxy */ 1002 if (purl) { 1003 /* XXX proxy authentication! */ 1004 conn = fetch_connect(purl->host, purl->port, af, verbose); 1005 } else { 1006 /* no proxy, go straight to target */ 1007 conn = fetch_connect(url->host, url->port, af, verbose); 1008 purl = NULL; 1009 } 1010 1011 /* check connection */ 1012 if (conn == NULL) 1013 /* fetch_connect() has already set an error code */ 1014 return (NULL); 1015 1016 /* expect welcome message */ 1017 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 1018 goto fouch; 1019 1020 /* authenticate */ 1021 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 1022 goto fouch; 1023 1024 /* TODO: Request extended features supported, if any (RFC 3659). */ 1025 1026 /* done */ 1027 return (conn); 1028 1029 fouch: 1030 if (e != -1) 1031 ftp_seterr(e); 1032 fetch_close(conn); 1033 return (NULL); 1034 } 1035 1036 /* 1037 * Disconnect from server 1038 */ 1039 static void 1040 ftp_disconnect(conn_t *conn) 1041 { 1042 (void)ftp_cmd(conn, "QUIT"); 1043 if (conn == cached_connection && conn->ref == 1) { 1044 free(cached_host.doc); 1045 cached_host.doc = NULL; 1046 cached_connection = NULL; 1047 } 1048 fetch_close(conn); 1049 } 1050 1051 /* 1052 * Check if we're already connected 1053 */ 1054 static int 1055 ftp_isconnected(struct url *url) 1056 { 1057 return (cached_connection 1058 && (cached_connection->is_active == 0) 1059 && (strcmp(url->host, cached_host.host) == 0) 1060 && (strcmp(url->user, cached_host.user) == 0) 1061 && (strcmp(url->pwd, cached_host.pwd) == 0) 1062 && (url->port == cached_host.port)); 1063 } 1064 1065 /* 1066 * Check the cache, reconnect if no luck 1067 */ 1068 static conn_t * 1069 ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1070 { 1071 char *doc; 1072 conn_t *conn; 1073 int e; 1074 1075 /* set default port */ 1076 if (!url->port) 1077 url->port = fetch_default_port(url->scheme); 1078 1079 /* try to use previously cached connection */ 1080 if (ftp_isconnected(url)) { 1081 e = ftp_cmd(cached_connection, "NOOP"); 1082 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1083 return (fetch_ref(cached_connection)); 1084 } 1085 1086 /* connect to server */ 1087 if ((conn = ftp_connect(url, purl, flags)) == NULL) 1088 return (NULL); 1089 doc = strdup(url->doc); 1090 if (doc != NULL) { 1091 if (cached_connection) 1092 ftp_disconnect(cached_connection); 1093 cached_connection = fetch_ref(conn); 1094 memcpy(&cached_host, url, sizeof(*url)); 1095 cached_host.doc = doc; 1096 } 1097 return (conn); 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; 1108 1109 if (flags != NULL && strchr(flags, 'd') != NULL) 1110 return (NULL); 1111 if (fetch_no_proxy_match(url->host)) 1112 return (NULL); 1113 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1114 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1115 *p && (purl = fetchParseURL(p)) != NULL) { 1116 if (!*purl->scheme) { 1117 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1118 strcpy(purl->scheme, SCHEME_FTP); 1119 else 1120 strcpy(purl->scheme, SCHEME_HTTP); 1121 } 1122 if (!purl->port) 1123 purl->port = fetch_default_proxy_port(purl->scheme); 1124 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1125 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1126 return (purl); 1127 fetchFreeURL(purl); 1128 } 1129 return (NULL); 1130 } 1131 1132 /* 1133 * Process an FTP request 1134 */ 1135 fetchIO * 1136 ftp_request(struct url *url, const char *op, const char *op_arg, 1137 struct url_stat *us, struct url *purl, const char *flags) 1138 { 1139 fetchIO *f; 1140 char *path; 1141 conn_t *conn; 1142 int if_modified_since, oflag; 1143 struct url_stat local_us; 1144 1145 /* check if we should use HTTP instead */ 1146 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1147 if (strcmp(op, "STAT") == 0) 1148 return (http_request(url, "HEAD", us, purl, flags)); 1149 else if (strcmp(op, "RETR") == 0) 1150 return (http_request(url, "GET", us, purl, flags)); 1151 /* 1152 * Our HTTP code doesn't support PUT requests yet, so try 1153 * a direct connection. 1154 */ 1155 } 1156 1157 /* connect to server */ 1158 conn = ftp_cached_connect(url, purl, flags); 1159 if (purl) 1160 fetchFreeURL(purl); 1161 if (conn == NULL) 1162 return (NULL); 1163 1164 if ((path = fetchUnquotePath(url)) == NULL) { 1165 fetch_syserr(); 1166 return NULL; 1167 } 1168 1169 /* change directory */ 1170 if (ftp_cwd(conn, path, op_arg != NULL) == -1) { 1171 free(path); 1172 return (NULL); 1173 } 1174 1175 if_modified_since = CHECK_FLAG('i'); 1176 if (if_modified_since && us == NULL) 1177 us = &local_us; 1178 1179 /* stat file */ 1180 if (us && ftp_stat(conn, path, us) == -1 1181 && fetchLastErrCode != FETCH_PROTO 1182 && fetchLastErrCode != FETCH_UNAVAIL) { 1183 free(path); 1184 return (NULL); 1185 } 1186 1187 if (if_modified_since && url->last_modified > 0 && 1188 url->last_modified >= us->mtime) { 1189 free(path); 1190 fetchLastErrCode = FETCH_UNCHANGED; 1191 snprintf(fetchLastErrString, MAXERRSTRING, "Unchanged"); 1192 return NULL; 1193 } 1194 1195 /* just a stat */ 1196 if (strcmp(op, "STAT") == 0) { 1197 free(path); 1198 return fetchIO_unopen(NULL, NULL, NULL, NULL); 1199 } 1200 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1201 oflag = O_WRONLY; 1202 else 1203 oflag = O_RDONLY; 1204 1205 /* initiate the transfer */ 1206 f = (ftp_transfer(conn, op, path, op_arg, oflag, url->offset, flags)); 1207 free(path); 1208 return f; 1209 } 1210 1211 /* 1212 * Get and stat file 1213 */ 1214 fetchIO * 1215 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1216 { 1217 return (ftp_request(url, "RETR", NULL, us, ftp_get_proxy(url, flags), flags)); 1218 } 1219 1220 /* 1221 * Get file 1222 */ 1223 fetchIO * 1224 fetchGetFTP(struct url *url, const char *flags) 1225 { 1226 return (fetchXGetFTP(url, NULL, flags)); 1227 } 1228 1229 /* 1230 * Put file 1231 */ 1232 fetchIO * 1233 fetchPutFTP(struct url *url, const char *flags) 1234 { 1235 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, NULL, 1236 ftp_get_proxy(url, flags), flags)); 1237 } 1238 1239 /* 1240 * Get file stats 1241 */ 1242 int 1243 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1244 { 1245 fetchIO *f; 1246 1247 f = ftp_request(url, "STAT", NULL, us, ftp_get_proxy(url, flags), flags); 1248 if (f == NULL) 1249 return (-1); 1250 fetchIO_close(f); 1251 return (0); 1252 } 1253 1254 /* 1255 * List a directory 1256 */ 1257 int 1258 fetchListFTP(struct url_list *ue, struct url *url, const char *pattern, const char *flags) 1259 { 1260 fetchIO *f; 1261 char buf[2 * PATH_MAX], *eol, *eos; 1262 ssize_t len; 1263 size_t cur_off; 1264 int ret; 1265 1266 /* XXX What about proxies? */ 1267 if (pattern == NULL || strcmp(pattern, "*") == 0) 1268 pattern = ""; 1269 f = ftp_request(url, "NLST", pattern, NULL, ftp_get_proxy(url, flags), flags); 1270 if (f == NULL) 1271 return -1; 1272 1273 cur_off = 0; 1274 ret = 0; 1275 1276 while ((len = fetchIO_read(f, buf + cur_off, sizeof(buf) - cur_off)) > 0) { 1277 cur_off += len; 1278 while ((eol = memchr(buf, '\n', cur_off)) != NULL) { 1279 if (len == eol - buf) 1280 break; 1281 if (eol != buf) { 1282 if (eol[-1] == '\r') 1283 eos = eol - 1; 1284 else 1285 eos = eol; 1286 *eos = '\0'; 1287 ret = fetch_add_entry(ue, url, buf, 0); 1288 if (ret) 1289 break; 1290 cur_off -= eol - buf + 1; 1291 memmove(buf, eol + 1, cur_off); 1292 } 1293 } 1294 if (ret) 1295 break; 1296 } 1297 if (cur_off != 0 || len < 0) { 1298 /* Not RFC conform, bail out. */ 1299 fetchIO_close(f); 1300 return -1; 1301 } 1302 fetchIO_close(f); 1303 return ret; 1304 } 1305