1 /* $NetBSD: ftp.c,v 1.1.1.10 2010/01/30 21:26:13 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 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 *)sin6; 148 addr = *(uint32_t *)&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 int 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, int *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, size_t pwdlen) 256 { 257 char *src, *dst, *end; 258 int q; 259 260 if (conn->err != FTP_WORKING_DIRECTORY && 261 conn->err != FTP_FILE_ACTION_OK) 262 return (FTP_PROTOCOL_ERROR); 263 end = conn->buf + conn->buflen; 264 src = conn->buf + 4; 265 if (src >= end || *src++ != '"') 266 return (FTP_PROTOCOL_ERROR); 267 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { 268 if (!q && *src == '"') 269 q = 1; 270 else if (q && *src != '"') 271 break; 272 else if (q) 273 *dst++ = '"', q = 0; 274 else 275 *dst++ = *src; 276 } 277 if (!pwdlen) 278 return (FTP_PROTOCOL_ERROR); 279 *dst = '\0'; 280 return (FTP_OK); 281 } 282 283 /* 284 * Change working directory to the directory that contains the specified 285 * file. 286 */ 287 static int 288 ftp_cwd(conn_t *conn, const char *file, int subdir) 289 { 290 const char *beg, *end; 291 char pwd[PATH_MAX]; 292 int e, i, len; 293 294 /* If no slashes in name, no need to change dirs. */ 295 if (subdir) 296 end = file + strlen(file); 297 else if ((end = strrchr(file, '/')) == NULL) 298 return (0); 299 if ((e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || 300 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 301 ftp_seterr(e); 302 return (-1); 303 } 304 for (;;) { 305 len = strlen(pwd); 306 307 /* Look for a common prefix between PWD and dir to fetch. */ 308 for (i = 0; i <= len && i <= end - file; ++i) 309 if (pwd[i] != file[i]) 310 break; 311 /* Keep going up a dir until we have a matching prefix. */ 312 if (strcmp(pwd, "/") == 0) 313 break; 314 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) 315 break; 316 if ((e = ftp_cmd(conn, "CDUP\r\n")) != FTP_FILE_ACTION_OK || 317 (e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || 318 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 319 ftp_seterr(e); 320 return (-1); 321 } 322 } 323 324 #ifdef FTP_COMBINE_CWDS 325 /* Skip leading slashes, even "////". */ 326 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) 327 /* nothing */ ; 328 329 /* If there is no trailing dir, we're already there. */ 330 if (beg >= end) 331 return (0); 332 333 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 334 e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(end - beg), beg); 335 if (e == FTP_FILE_ACTION_OK) 336 return (0); 337 #endif /* FTP_COMBINE_CWDS */ 338 339 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 340 for (beg = file + i; beg < end; beg = file + i + 1) { 341 while (*beg == '/') 342 ++beg, ++i; 343 for (++i; file + i < end && file[i] != '/'; ++i) 344 /* nothing */ ; 345 e = ftp_cmd(conn, "CWD %.*s\r\n", file + i - beg, beg); 346 if (e != FTP_FILE_ACTION_OK) { 347 ftp_seterr(e); 348 return (-1); 349 } 350 } 351 return (0); 352 } 353 354 /* 355 * Set transfer mode and data type 356 */ 357 static int 358 ftp_mode_type(conn_t *conn, int mode, int type) 359 { 360 int e; 361 362 switch (mode) { 363 case 0: 364 case 's': 365 mode = 'S'; 366 case 'S': 367 break; 368 default: 369 return (FTP_PROTOCOL_ERROR); 370 } 371 if ((e = ftp_cmd(conn, "MODE %c\r\n", mode)) != FTP_OK) { 372 if (mode == 'S') { 373 /* 374 * Stream mode is supposed to be the default - so 375 * much so that some servers not only do not 376 * support any other mode, but do not support the 377 * MODE command at all. 378 * 379 * If "MODE S" fails, it is unlikely that we 380 * previously succeeded in setting a different 381 * mode. Therefore, we simply hope that the 382 * server is already in the correct mode, and 383 * silently ignore the failure. 384 */ 385 } else { 386 return (e); 387 } 388 } 389 390 switch (type) { 391 case 0: 392 case 'i': 393 type = 'I'; 394 case 'I': 395 break; 396 case 'a': 397 type = 'A'; 398 case 'A': 399 break; 400 case 'd': 401 type = 'D'; 402 case 'D': 403 /* can't handle yet */ 404 default: 405 return (FTP_PROTOCOL_ERROR); 406 } 407 if ((e = ftp_cmd(conn, "TYPE %c\r\n", type)) != FTP_OK) 408 return (e); 409 410 return (FTP_OK); 411 } 412 413 /* 414 * Request and parse file stats 415 */ 416 static int 417 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 418 { 419 char *ln; 420 const char *filename; 421 int filenamelen, type; 422 struct tm tm; 423 time_t t; 424 int e; 425 426 us->size = -1; 427 us->atime = us->mtime = 0; 428 429 filename = ftp_filename(file, &filenamelen, &type, 0); 430 431 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 432 ftp_seterr(e); 433 return (-1); 434 } 435 436 e = ftp_cmd(conn, "SIZE %.*s\r\n", filenamelen, filename); 437 if (e != FTP_FILE_STATUS) { 438 ftp_seterr(e); 439 return (-1); 440 } 441 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 442 /* nothing */ ; 443 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 444 us->size = us->size * 10 + *ln - '0'; 445 if (*ln && !isspace((unsigned char)*ln)) { 446 ftp_seterr(FTP_PROTOCOL_ERROR); 447 us->size = -1; 448 return (-1); 449 } 450 if (us->size == 0) 451 us->size = -1; 452 453 e = ftp_cmd(conn, "MDTM %.*s\r\n", filenamelen, filename); 454 if (e != FTP_FILE_STATUS) { 455 ftp_seterr(e); 456 return (-1); 457 } 458 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 459 /* nothing */ ; 460 switch (strspn(ln, "0123456789")) { 461 case 14: 462 break; 463 case 15: 464 ln++; 465 ln[0] = '2'; 466 ln[1] = '0'; 467 break; 468 default: 469 ftp_seterr(FTP_PROTOCOL_ERROR); 470 return (-1); 471 } 472 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 473 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 474 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 475 ftp_seterr(FTP_PROTOCOL_ERROR); 476 return (-1); 477 } 478 tm.tm_mon--; 479 tm.tm_year -= 1900; 480 tm.tm_isdst = -1; 481 t = timegm(&tm); 482 if (t == (time_t)-1) 483 t = time(NULL); 484 us->mtime = t; 485 us->atime = t; 486 487 return (0); 488 } 489 490 /* 491 * I/O functions for FTP 492 */ 493 struct ftpio { 494 conn_t *cconn; /* Control connection */ 495 conn_t *dconn; /* Data connection */ 496 int dir; /* Direction */ 497 int eof; /* EOF reached */ 498 int err; /* Error code */ 499 }; 500 501 static ssize_t ftp_readfn(void *, void *, size_t); 502 static ssize_t ftp_writefn(void *, const void *, size_t); 503 static void ftp_closefn(void *); 504 505 static ssize_t 506 ftp_readfn(void *v, void *buf, size_t len) 507 { 508 struct ftpio *io; 509 int r; 510 511 io = (struct ftpio *)v; 512 if (io == NULL) { 513 errno = EBADF; 514 return (-1); 515 } 516 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 517 errno = EBADF; 518 return (-1); 519 } 520 if (io->err) { 521 errno = io->err; 522 return (-1); 523 } 524 if (io->eof) 525 return (0); 526 r = fetch_read(io->dconn, buf, len); 527 if (r > 0) 528 return (r); 529 if (r == 0) { 530 io->eof = 1; 531 return (0); 532 } 533 if (errno != EINTR) 534 io->err = errno; 535 return (-1); 536 } 537 538 static ssize_t 539 ftp_writefn(void *v, const void *buf, size_t len) 540 { 541 struct ftpio *io; 542 int w; 543 544 io = (struct ftpio *)v; 545 if (io == NULL) { 546 errno = EBADF; 547 return (-1); 548 } 549 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 550 errno = EBADF; 551 return (-1); 552 } 553 if (io->err) { 554 errno = io->err; 555 return (-1); 556 } 557 w = fetch_write(io->dconn, buf, len); 558 if (w >= 0) 559 return (w); 560 if (errno != EINTR) 561 io->err = errno; 562 return (-1); 563 } 564 565 static int 566 ftp_disconnect(conn_t *conn) 567 { 568 ftp_cmd(conn, "QUIT\r\n"); 569 return fetch_close(conn); 570 } 571 572 static void 573 ftp_closefn(void *v) 574 { 575 struct ftpio *io; 576 int r; 577 578 io = (struct ftpio *)v; 579 if (io == NULL) { 580 errno = EBADF; 581 return; 582 } 583 if (io->dir == -1) 584 return; 585 if (io->cconn == NULL || io->dconn == NULL) { 586 errno = EBADF; 587 return; 588 } 589 fetch_close(io->dconn); 590 io->dconn = NULL; 591 io->dir = -1; 592 r = ftp_chkerr(io->cconn); 593 fetch_cache_put(io->cconn, ftp_disconnect); 594 free(io); 595 return; 596 } 597 598 static fetchIO * 599 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 600 { 601 struct ftpio *io; 602 fetchIO *f; 603 604 if (cconn == NULL || dconn == NULL) 605 return (NULL); 606 if ((io = malloc(sizeof(*io))) == NULL) 607 return (NULL); 608 io->cconn = cconn; 609 io->dconn = dconn; 610 io->dir = mode; 611 io->eof = io->err = 0; 612 f = fetchIO_unopen(io, ftp_readfn, ftp_writefn, ftp_closefn); 613 if (f == NULL) 614 free(io); 615 return (f); 616 } 617 618 /* 619 * Transfer file 620 */ 621 static fetchIO * 622 ftp_transfer(conn_t *conn, const char *oper, const char *file, const char *op_arg, 623 int mode, off_t offset, const char *flags) 624 { 625 union anonymous { 626 struct sockaddr_storage ss; 627 struct sockaddr sa; 628 struct sockaddr_in6 sin6; 629 struct sockaddr_in sin4; 630 } u; 631 const char *bindaddr; 632 const char *filename; 633 int filenamelen, type; 634 int low, pasv, verbose; 635 int e, sd = -1; 636 socklen_t l; 637 char *s; 638 fetchIO *df; 639 640 /* check flags */ 641 low = CHECK_FLAG('l'); 642 pasv = !CHECK_FLAG('a'); 643 verbose = CHECK_FLAG('v'); 644 645 /* passive mode */ 646 if (!pasv) 647 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 648 strncasecmp(s, "no", 2) != 0); 649 650 /* isolate filename */ 651 filename = ftp_filename(file, &filenamelen, &type, op_arg != NULL); 652 653 /* set transfer mode and data type */ 654 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 655 goto ouch; 656 657 /* find our own address, bind, and listen */ 658 l = sizeof(u.ss); 659 if (getsockname(conn->sd, &u.sa, &l) == -1) 660 goto sysouch; 661 if (u.ss.ss_family == AF_INET6) 662 unmappedaddr(&u.sin6, &l); 663 664 retry_mode: 665 666 /* open data socket */ 667 if ((sd = socket(u.ss.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 668 fetch_syserr(); 669 return (NULL); 670 } 671 672 if (pasv) { 673 unsigned char addr[64]; 674 char *ln, *p; 675 unsigned int i; 676 int port; 677 678 /* send PASV command */ 679 if (verbose) 680 fetch_info("setting passive mode"); 681 switch (u.ss.ss_family) { 682 case AF_INET: 683 if ((e = ftp_cmd(conn, "PASV\r\n")) != FTP_PASSIVE_MODE) 684 goto ouch; 685 break; 686 case AF_INET6: 687 if ((e = ftp_cmd(conn, "EPSV\r\n")) != FTP_EPASSIVE_MODE) { 688 if (e == -1) 689 goto ouch; 690 if ((e = ftp_cmd(conn, "LPSV\r\n")) != 691 FTP_LPASSIVE_MODE) 692 goto ouch; 693 } 694 break; 695 default: 696 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 697 goto ouch; 698 } 699 700 /* 701 * Find address and port number. The reply to the PASV command 702 * is IMHO the one and only weak point in the FTP protocol. 703 */ 704 ln = conn->buf; 705 switch (e) { 706 case FTP_PASSIVE_MODE: 707 case FTP_LPASSIVE_MODE: 708 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 709 /* nothing */ ; 710 if (!*p) { 711 e = FTP_PROTOCOL_ERROR; 712 goto ouch; 713 } 714 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 715 for (i = 0; *p && i < l; i++, p++) 716 addr[i] = strtol(p, &p, 10); 717 if (i < l) { 718 e = FTP_PROTOCOL_ERROR; 719 goto ouch; 720 } 721 break; 722 case FTP_EPASSIVE_MODE: 723 for (p = ln + 3; *p && *p != '('; p++) 724 /* nothing */ ; 725 if (!*p) { 726 e = FTP_PROTOCOL_ERROR; 727 goto ouch; 728 } 729 ++p; 730 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 731 &port, &addr[3]) != 5 || 732 addr[0] != addr[1] || 733 addr[0] != addr[2] || addr[0] != addr[3]) { 734 e = FTP_PROTOCOL_ERROR; 735 goto ouch; 736 } 737 break; 738 case FTP_SYNTAX_ERROR: 739 if (verbose) 740 fetch_info("passive mode failed"); 741 /* Close socket and retry with passive mode. */ 742 pasv = 0; 743 close(sd); 744 sd = -1; 745 goto retry_mode; 746 } 747 748 /* seek to required offset */ 749 if (offset) 750 if (ftp_cmd(conn, "REST %lu\r\n", (unsigned long)offset) != FTP_FILE_OK) 751 goto sysouch; 752 753 /* construct sockaddr for data socket */ 754 l = sizeof(u.ss); 755 if (getpeername(conn->sd, &u.sa, &l) == -1) 756 goto sysouch; 757 if (u.ss.ss_family == AF_INET6) 758 unmappedaddr(&u.sin6, &l); 759 switch (u.ss.ss_family) { 760 case AF_INET6: 761 if (e == FTP_EPASSIVE_MODE) 762 u.sin6.sin6_port = htons(port); 763 else { 764 memcpy(&u.sin6.sin6_addr, addr + 2, 16); 765 memcpy(&u.sin6.sin6_port, addr + 19, 2); 766 } 767 break; 768 case AF_INET: 769 if (e == FTP_EPASSIVE_MODE) 770 u.sin4.sin_port = htons(port); 771 else { 772 memcpy(&u.sin4.sin_addr, addr, 4); 773 memcpy(&u.sin4.sin_port, addr + 4, 2); 774 } 775 break; 776 default: 777 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 778 break; 779 } 780 781 /* connect to data port */ 782 if (verbose) 783 fetch_info("opening data connection"); 784 bindaddr = getenv("FETCH_BIND_ADDRESS"); 785 if (bindaddr != NULL && *bindaddr != '\0' && 786 fetch_bind(sd, u.ss.ss_family, bindaddr) != 0) 787 goto sysouch; 788 if (connect(sd, &u.sa, l) == -1) 789 goto sysouch; 790 791 /* make the server initiate the transfer */ 792 if (verbose) 793 fetch_info("initiating transfer"); 794 if (op_arg) 795 e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); 796 else 797 e = ftp_cmd(conn, "%s %.*s\r\n", oper, 798 filenamelen, filename); 799 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 800 goto ouch; 801 802 } else { 803 uint32_t a; 804 uint16_t p; 805 #if defined(IPV6_PORTRANGE) || defined(IP_PORTRANGE) 806 int arg; 807 #endif 808 int d; 809 char *ap; 810 char hname[INET6_ADDRSTRLEN]; 811 812 switch (u.ss.ss_family) { 813 case AF_INET6: 814 u.sin6.sin6_port = 0; 815 #ifdef IPV6_PORTRANGE 816 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 817 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 818 (char *)&arg, sizeof(arg)) == -1) 819 goto sysouch; 820 #endif 821 break; 822 case AF_INET: 823 u.sin4.sin_port = 0; 824 #ifdef IP_PORTRANGE 825 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 826 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 827 (char *)&arg, sizeof(arg)) == -1) 828 goto sysouch; 829 #endif 830 break; 831 } 832 if (verbose) 833 fetch_info("binding data socket"); 834 if (bind(sd, &u.sa, l) == -1) 835 goto sysouch; 836 if (listen(sd, 1) == -1) 837 goto sysouch; 838 839 /* find what port we're on and tell the server */ 840 if (getsockname(sd, &u.sa, &l) == -1) 841 goto sysouch; 842 switch (u.ss.ss_family) { 843 case AF_INET: 844 a = ntohl(u.sin4.sin_addr.s_addr); 845 p = ntohs(u.sin4.sin_port); 846 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d\r\n", 847 (a >> 24) & 0xff, (a >> 16) & 0xff, 848 (a >> 8) & 0xff, a & 0xff, 849 (p >> 8) & 0xff, p & 0xff); 850 break; 851 case AF_INET6: 852 #define UC(b) (((int)b)&0xff) 853 e = -1; 854 u.sin6.sin6_scope_id = 0; 855 if (getnameinfo(&u.sa, l, 856 hname, sizeof(hname), 857 NULL, 0, NI_NUMERICHOST) == 0) { 858 e = ftp_cmd(conn, "EPRT |%d|%s|%d|\r\n", 2, hname, 859 htons(u.sin6.sin6_port)); 860 if (e == -1) 861 goto ouch; 862 } 863 if (e != FTP_OK) { 864 ap = (char *)&u.sin6.sin6_addr; 865 e = ftp_cmd(conn, 866 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d\r\n", 867 6, 16, 868 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 869 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 870 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 871 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 872 2, 873 (ntohs(u.sin6.sin6_port) >> 8) & 0xff, 874 ntohs(u.sin6.sin6_port) & 0xff); 875 } 876 break; 877 default: 878 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 879 goto ouch; 880 } 881 if (e != FTP_OK) 882 goto ouch; 883 884 /* seek to required offset */ 885 if (offset) 886 if (ftp_cmd(conn, "REST %llu\r\n", (unsigned long long)offset) != FTP_FILE_OK) 887 goto sysouch; 888 889 /* make the server initiate the transfer */ 890 if (verbose) 891 fetch_info("initiating transfer"); 892 if (op_arg) 893 e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); 894 else 895 e = ftp_cmd(conn, "%s %.*s\r\n", oper, 896 filenamelen, filename); 897 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 898 goto ouch; 899 900 /* accept the incoming connection and go to town */ 901 if ((d = accept(sd, NULL, NULL)) == -1) 902 goto sysouch; 903 close(sd); 904 sd = d; 905 } 906 907 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 908 goto sysouch; 909 return (df); 910 911 sysouch: 912 fetch_syserr(); 913 if (sd >= 0) 914 close(sd); 915 return (NULL); 916 917 ouch: 918 if (e != -1) 919 ftp_seterr(e); 920 if (sd >= 0) 921 close(sd); 922 return (NULL); 923 } 924 925 /* 926 * Authenticate 927 */ 928 static int 929 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 930 { 931 const char *user, *pwd, *login_name; 932 char pbuf[URL_USERLEN + 1 + URL_HOSTLEN + 1]; 933 int e, len; 934 935 /* XXX FTP_AUTH, and maybe .netrc */ 936 937 /* send user name and password */ 938 if (url->user[0] == '\0') 939 fetch_netrc_auth(url); 940 user = url->user; 941 if (*user == '\0') 942 user = getenv("FTP_LOGIN"); 943 if (user == NULL || *user == '\0') 944 user = FTP_ANONYMOUS_USER; 945 if (purl && url->port == fetch_default_port(url->scheme)) 946 e = ftp_cmd(conn, "USER %s@%s\r\n", user, url->host); 947 else if (purl) 948 e = ftp_cmd(conn, "USER %s@%s@%d\r\n", user, url->host, url->port); 949 else 950 e = ftp_cmd(conn, "USER %s\r\n", user); 951 952 /* did the server request a password? */ 953 if (e == FTP_NEED_PASSWORD) { 954 pwd = url->pwd; 955 if (*pwd == '\0') 956 pwd = getenv("FTP_PASSWORD"); 957 if (pwd == NULL || *pwd == '\0') { 958 if ((login_name = getlogin()) == 0) 959 login_name = FTP_ANONYMOUS_USER; 960 if ((len = snprintf(pbuf, URL_USERLEN + 2, "%s@", login_name)) < 0) 961 len = 0; 962 else if (len > URL_USERLEN + 1) 963 len = URL_USERLEN + 1; 964 gethostname(pbuf + len, sizeof(pbuf) - len); 965 /* MAXHOSTNAMELEN can differ from URL_HOSTLEN + 1 */ 966 pbuf[sizeof(pbuf) - 1] = '\0'; 967 pwd = pbuf; 968 } 969 e = ftp_cmd(conn, "PASS %s\r\n", pwd); 970 } 971 972 return (e); 973 } 974 975 /* 976 * Log on to FTP server 977 */ 978 static conn_t * 979 ftp_connect(struct url *url, struct url *purl, const char *flags) 980 { 981 conn_t *conn; 982 int e, direct, verbose; 983 #ifdef INET6 984 int af = AF_UNSPEC; 985 #else 986 int af = AF_INET; 987 #endif 988 989 direct = CHECK_FLAG('d'); 990 verbose = CHECK_FLAG('v'); 991 if (CHECK_FLAG('4')) 992 af = AF_INET; 993 else if (CHECK_FLAG('6')) 994 af = AF_INET6; 995 996 if (direct) 997 purl = NULL; 998 999 /* check for proxy */ 1000 if (purl) { 1001 /* XXX proxy authentication! */ 1002 /* XXX connetion caching */ 1003 if (!purl->port) 1004 purl->port = fetch_default_port(purl->scheme); 1005 1006 conn = fetch_connect(purl, af, verbose); 1007 } else { 1008 /* no proxy, go straight to target */ 1009 if (!url->port) 1010 url->port = fetch_default_port(url->scheme); 1011 1012 while ((conn = fetch_cache_get(url, af)) != NULL) { 1013 e = ftp_cmd(conn, "NOOP\r\n"); 1014 if (e == FTP_OK) 1015 return conn; 1016 fetch_close(conn); 1017 } 1018 conn = fetch_connect(url, af, verbose); 1019 purl = NULL; 1020 } 1021 1022 /* check connection */ 1023 if (conn == NULL) 1024 /* fetch_connect() has already set an error code */ 1025 return (NULL); 1026 1027 /* expect welcome message */ 1028 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 1029 goto fouch; 1030 1031 /* authenticate */ 1032 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 1033 goto fouch; 1034 1035 /* TODO: Request extended features supported, if any (RFC 3659). */ 1036 1037 /* done */ 1038 return (conn); 1039 1040 fouch: 1041 if (e != -1) 1042 ftp_seterr(e); 1043 fetch_close(conn); 1044 return (NULL); 1045 } 1046 1047 /* 1048 * Check the proxy settings 1049 */ 1050 static struct url * 1051 ftp_get_proxy(struct url * url, const char *flags) 1052 { 1053 struct url *purl; 1054 char *p; 1055 1056 if (flags != NULL && strchr(flags, 'd') != NULL) 1057 return (NULL); 1058 if (fetch_no_proxy_match(url->host)) 1059 return (NULL); 1060 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1061 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1062 *p && (purl = fetchParseURL(p)) != NULL) { 1063 if (!*purl->scheme) { 1064 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1065 strcpy(purl->scheme, SCHEME_FTP); 1066 else 1067 strcpy(purl->scheme, SCHEME_HTTP); 1068 } 1069 if (!purl->port) 1070 purl->port = fetch_default_proxy_port(purl->scheme); 1071 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1072 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1073 return (purl); 1074 fetchFreeURL(purl); 1075 } 1076 return (NULL); 1077 } 1078 1079 /* 1080 * Process an FTP request 1081 */ 1082 fetchIO * 1083 ftp_request(struct url *url, const char *op, const char *op_arg, 1084 struct url_stat *us, struct url *purl, const char *flags) 1085 { 1086 fetchIO *f; 1087 char *path; 1088 conn_t *conn; 1089 int if_modified_since, oflag; 1090 struct url_stat local_us; 1091 1092 /* check if we should use HTTP instead */ 1093 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1094 if (strcmp(op, "STAT") == 0) 1095 return (http_request(url, "HEAD", us, purl, flags)); 1096 else if (strcmp(op, "RETR") == 0) 1097 return (http_request(url, "GET", us, purl, flags)); 1098 /* 1099 * Our HTTP code doesn't support PUT requests yet, so try 1100 * a direct connection. 1101 */ 1102 } 1103 1104 /* connect to server */ 1105 conn = ftp_connect(url, purl, flags); 1106 if (purl) 1107 fetchFreeURL(purl); 1108 if (conn == NULL) 1109 return (NULL); 1110 1111 if ((path = fetchUnquotePath(url)) == NULL) { 1112 fetch_syserr(); 1113 return NULL; 1114 } 1115 1116 /* change directory */ 1117 if (ftp_cwd(conn, path, op_arg != NULL) == -1) { 1118 free(path); 1119 return (NULL); 1120 } 1121 1122 if_modified_since = CHECK_FLAG('i'); 1123 if (if_modified_since && us == NULL) 1124 us = &local_us; 1125 1126 /* stat file */ 1127 if (us && ftp_stat(conn, path, us) == -1 1128 && fetchLastErrCode != FETCH_PROTO 1129 && fetchLastErrCode != FETCH_UNAVAIL) { 1130 free(path); 1131 return (NULL); 1132 } 1133 1134 if (if_modified_since && url->last_modified > 0 && 1135 url->last_modified >= us->mtime) { 1136 free(path); 1137 fetchLastErrCode = FETCH_UNCHANGED; 1138 snprintf(fetchLastErrString, MAXERRSTRING, "Unchanged"); 1139 return NULL; 1140 } 1141 1142 /* just a stat */ 1143 if (strcmp(op, "STAT") == 0) { 1144 free(path); 1145 return fetchIO_unopen(NULL, NULL, NULL, NULL); 1146 } 1147 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1148 oflag = O_WRONLY; 1149 else 1150 oflag = O_RDONLY; 1151 1152 /* initiate the transfer */ 1153 f = (ftp_transfer(conn, op, path, op_arg, oflag, url->offset, flags)); 1154 free(path); 1155 return f; 1156 } 1157 1158 /* 1159 * Get and stat file 1160 */ 1161 fetchIO * 1162 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1163 { 1164 return (ftp_request(url, "RETR", NULL, us, ftp_get_proxy(url, flags), flags)); 1165 } 1166 1167 /* 1168 * Get file 1169 */ 1170 fetchIO * 1171 fetchGetFTP(struct url *url, const char *flags) 1172 { 1173 return (fetchXGetFTP(url, NULL, flags)); 1174 } 1175 1176 /* 1177 * Put file 1178 */ 1179 fetchIO * 1180 fetchPutFTP(struct url *url, const char *flags) 1181 { 1182 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, NULL, 1183 ftp_get_proxy(url, flags), flags)); 1184 } 1185 1186 /* 1187 * Get file stats 1188 */ 1189 int 1190 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1191 { 1192 fetchIO *f; 1193 1194 f = ftp_request(url, "STAT", NULL, us, ftp_get_proxy(url, flags), flags); 1195 if (f == NULL) 1196 return (-1); 1197 fetchIO_close(f); 1198 return (0); 1199 } 1200 1201 /* 1202 * List a directory 1203 */ 1204 int 1205 fetchListFTP(struct url_list *ue, struct url *url, const char *pattern, const char *flags) 1206 { 1207 fetchIO *f; 1208 char buf[2 * PATH_MAX], *eol, *eos; 1209 ssize_t len; 1210 size_t cur_off; 1211 int ret; 1212 1213 /* XXX What about proxies? */ 1214 if (pattern == NULL || strcmp(pattern, "*") == 0) 1215 pattern = ""; 1216 f = ftp_request(url, "NLST", pattern, NULL, ftp_get_proxy(url, flags), flags); 1217 if (f == NULL) 1218 return -1; 1219 1220 cur_off = 0; 1221 ret = 0; 1222 1223 while ((len = fetchIO_read(f, buf + cur_off, sizeof(buf) - cur_off)) > 0) { 1224 cur_off += len; 1225 while ((eol = memchr(buf, '\n', cur_off)) != NULL) { 1226 if (len == eol - buf) 1227 break; 1228 if (eol != buf) { 1229 if (eol[-1] == '\r') 1230 eos = eol - 1; 1231 else 1232 eos = eol; 1233 *eos = '\0'; 1234 ret = fetch_add_entry(ue, url, buf, 0); 1235 if (ret) 1236 break; 1237 cur_off -= eol - buf + 1; 1238 memmove(buf, eol + 1, cur_off); 1239 } 1240 } 1241 if (ret) 1242 break; 1243 } 1244 if (cur_off != 0 || len < 0) { 1245 /* Not RFC conform, bail out. */ 1246 fetchIO_close(f); 1247 return -1; 1248 } 1249 fetchIO_close(f); 1250 return ret; 1251 } 1252