1 /* $NetBSD: ftp.c,v 1.1.1.3 2008/10/29 16:18:14 joerg Exp $ */ 2 /*- 3 * Copyright (c) 1998-2004 Dag-Erling Co�dan Sm�rgrav 4 * Copyright (c) 2008 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 #if HAVE_CONFIG_H 61 #include "config.h" 62 #endif 63 #ifndef NETBSD 64 #include <nbcompat.h> 65 #endif 66 67 #include <sys/types.h> 68 #include <sys/socket.h> 69 70 #include <arpa/inet.h> 71 #include <netinet/in.h> 72 73 #include <ctype.h> 74 #include <errno.h> 75 #include <fcntl.h> 76 #if defined(HAVE_INTTYPES_H) || defined(NETBSD) 77 #include <inttypes.h> 78 #endif 79 #include <stdarg.h> 80 #ifndef NETBSD 81 #include <nbcompat/netdb.h> 82 #include <nbcompat/stdio.h> 83 #else 84 #include <netdb.h> 85 #include <stdio.h> 86 #endif 87 #include <stdlib.h> 88 #include <string.h> 89 #include <time.h> 90 #include <unistd.h> 91 92 #include "fetch.h" 93 #include "common.h" 94 #include "ftperr.h" 95 96 #define FTP_ANONYMOUS_USER "anonymous" 97 98 #define FTP_CONNECTION_ALREADY_OPEN 125 99 #define FTP_OPEN_DATA_CONNECTION 150 100 #define FTP_OK 200 101 #define FTP_FILE_STATUS 213 102 #define FTP_SERVICE_READY 220 103 #define FTP_TRANSFER_COMPLETE 226 104 #define FTP_PASSIVE_MODE 227 105 #define FTP_LPASSIVE_MODE 228 106 #define FTP_EPASSIVE_MODE 229 107 #define FTP_LOGGED_IN 230 108 #define FTP_FILE_ACTION_OK 250 109 #define FTP_DIRECTORY_CREATED 257 /* multiple meanings */ 110 #define FTP_FILE_CREATED 257 /* multiple meanings */ 111 #define FTP_WORKING_DIRECTORY 257 /* multiple meanings */ 112 #define FTP_NEED_PASSWORD 331 113 #define FTP_NEED_ACCOUNT 332 114 #define FTP_FILE_OK 350 115 #define FTP_SYNTAX_ERROR 500 116 #define FTP_PROTOCOL_ERROR 999 117 118 static struct url cached_host; 119 static conn_t *cached_connection; 120 121 #define isftpreply(foo) \ 122 (isdigit((unsigned char)foo[0]) && \ 123 isdigit((unsigned char)foo[1]) && \ 124 isdigit((unsigned char)foo[2]) && \ 125 (foo[3] == ' ' || foo[3] == '\0')) 126 #define isftpinfo(foo) \ 127 (isdigit((unsigned char)foo[0]) && \ 128 isdigit((unsigned char)foo[1]) && \ 129 isdigit((unsigned char)foo[2]) && \ 130 foo[3] == '-') 131 132 /* 133 * Translate IPv4 mapped IPv6 address to IPv4 address 134 */ 135 static void 136 unmappedaddr(struct sockaddr_in6 *sin6, socklen_t *len) 137 { 138 struct sockaddr_in *sin4; 139 uint32_t addr; 140 int port; 141 142 if (sin6->sin6_family != AF_INET6 || 143 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 144 return; 145 sin4 = (struct sockaddr_in *)sin6; 146 addr = *(uint32_t *)&sin6->sin6_addr.s6_addr[12]; 147 port = sin6->sin6_port; 148 memset(sin4, 0, sizeof(struct sockaddr_in)); 149 sin4->sin_addr.s_addr = addr; 150 sin4->sin_port = port; 151 sin4->sin_family = AF_INET; 152 *len = sizeof(struct sockaddr_in); 153 #ifdef HAVE_SA_LEN 154 sin4->sin_len = sizeof(struct sockaddr_in); 155 #endif 156 } 157 158 /* 159 * Get server response 160 */ 161 static int 162 ftp_chkerr(conn_t *conn) 163 { 164 if (fetch_getln(conn) == -1) { 165 fetch_syserr(); 166 return (-1); 167 } 168 if (isftpinfo(conn->buf)) { 169 while (conn->buflen && !isftpreply(conn->buf)) { 170 if (fetch_getln(conn) == -1) { 171 fetch_syserr(); 172 return (-1); 173 } 174 } 175 } 176 177 while (conn->buflen && 178 isspace((unsigned char)conn->buf[conn->buflen - 1])) 179 conn->buflen--; 180 conn->buf[conn->buflen] = '\0'; 181 182 if (!isftpreply(conn->buf)) { 183 ftp_seterr(FTP_PROTOCOL_ERROR); 184 return (-1); 185 } 186 187 conn->err = (conn->buf[0] - '0') * 100 188 + (conn->buf[1] - '0') * 10 189 + (conn->buf[2] - '0'); 190 191 return (conn->err); 192 } 193 194 /* 195 * Send a command and check reply 196 */ 197 static int 198 ftp_cmd(conn_t *conn, const char *fmt, ...) 199 { 200 va_list ap; 201 size_t len; 202 char *msg; 203 int r; 204 205 va_start(ap, fmt); 206 len = vasprintf(&msg, fmt, ap); 207 va_end(ap); 208 209 if (msg == NULL) { 210 errno = ENOMEM; 211 fetch_syserr(); 212 return (-1); 213 } 214 215 r = fetch_putln(conn, msg, len); 216 free(msg); 217 218 if (r == -1) { 219 fetch_syserr(); 220 return (-1); 221 } 222 223 return (ftp_chkerr(conn)); 224 } 225 226 /* 227 * Return a pointer to the filename part of a path 228 */ 229 static const char * 230 ftp_filename(const char *file, int *len, int *type, int subdir) 231 { 232 const char *s; 233 234 if ((s = strrchr(file, '/')) == NULL || subdir) 235 s = file; 236 else 237 s = s + 1; 238 *len = strlen(s); 239 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 240 *type = s[*len - 1]; 241 *len -= 7; 242 } else { 243 *type = '\0'; 244 } 245 return (s); 246 } 247 248 /* 249 * Get current working directory from the reply to a CWD, PWD or CDUP 250 * command. 251 */ 252 static int 253 ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen) 254 { 255 char *src, *dst, *end; 256 int q; 257 258 if (conn->err != FTP_WORKING_DIRECTORY && 259 conn->err != FTP_FILE_ACTION_OK) 260 return (FTP_PROTOCOL_ERROR); 261 end = conn->buf + conn->buflen; 262 src = conn->buf + 4; 263 if (src >= end || *src++ != '"') 264 return (FTP_PROTOCOL_ERROR); 265 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { 266 if (!q && *src == '"') 267 q = 1; 268 else if (q && *src != '"') 269 break; 270 else if (q) 271 *dst++ = '"', q = 0; 272 else 273 *dst++ = *src; 274 } 275 if (!pwdlen) 276 return (FTP_PROTOCOL_ERROR); 277 *dst = '\0'; 278 return (FTP_OK); 279 } 280 281 /* 282 * Change working directory to the directory that contains the specified 283 * file. 284 */ 285 static int 286 ftp_cwd(conn_t *conn, const char *file, int subdir) 287 { 288 const char *beg, *end; 289 char pwd[PATH_MAX]; 290 int e, i, len; 291 292 /* If no slashes in name, no need to change dirs. */ 293 if (subdir) 294 end = file + strlen(file); 295 else if ((end = strrchr(file, '/')) == NULL) 296 return (0); 297 if ((e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 298 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 299 ftp_seterr(e); 300 return (-1); 301 } 302 for (;;) { 303 len = strlen(pwd); 304 305 /* Look for a common prefix between PWD and dir to fetch. */ 306 for (i = 0; i <= len && i <= end - file; ++i) 307 if (pwd[i] != file[i]) 308 break; 309 /* Keep going up a dir until we have a matching prefix. */ 310 if (strcmp(pwd, "/") == 0) 311 break; 312 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) 313 break; 314 if ((e = ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || 315 (e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 316 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 317 ftp_seterr(e); 318 return (-1); 319 } 320 } 321 322 #ifdef FTP_COMBINE_CWDS 323 /* Skip leading slashes, even "////". */ 324 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) 325 /* nothing */ ; 326 327 /* If there is no trailing dir, we're already there. */ 328 if (beg >= end) 329 return (0); 330 331 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 332 e = ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); 333 if (e == FTP_FILE_ACTION_OK) 334 return (0); 335 #endif /* FTP_COMBINE_CWDS */ 336 337 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 338 for (beg = file + i; beg < end; beg = file + i + 1) { 339 while (*beg == '/') 340 ++beg, ++i; 341 for (++i; file + i < end && file[i] != '/'; ++i) 342 /* nothing */ ; 343 e = ftp_cmd(conn, "CWD %.*s", file + i - beg, beg); 344 if (e != FTP_FILE_ACTION_OK) { 345 ftp_seterr(e); 346 return (-1); 347 } 348 } 349 return (0); 350 } 351 352 /* 353 * Set transfer mode and data type 354 */ 355 static int 356 ftp_mode_type(conn_t *conn, int mode, int type) 357 { 358 int e; 359 360 switch (mode) { 361 case 0: 362 case 's': 363 mode = 'S'; 364 case 'S': 365 break; 366 default: 367 return (FTP_PROTOCOL_ERROR); 368 } 369 if ((e = ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { 370 if (mode == 'S') { 371 /* 372 * Stream mode is supposed to be the default - so 373 * much so that some servers not only do not 374 * support any other mode, but do not support the 375 * MODE command at all. 376 * 377 * If "MODE S" fails, it is unlikely that we 378 * previously succeeded in setting a different 379 * mode. Therefore, we simply hope that the 380 * server is already in the correct mode, and 381 * silently ignore the failure. 382 */ 383 } else { 384 return (e); 385 } 386 } 387 388 switch (type) { 389 case 0: 390 case 'i': 391 type = 'I'; 392 case 'I': 393 break; 394 case 'a': 395 type = 'A'; 396 case 'A': 397 break; 398 case 'd': 399 type = 'D'; 400 case 'D': 401 /* can't handle yet */ 402 default: 403 return (FTP_PROTOCOL_ERROR); 404 } 405 if ((e = ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) 406 return (e); 407 408 return (FTP_OK); 409 } 410 411 /* 412 * Request and parse file stats 413 */ 414 static int 415 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 416 { 417 char *ln; 418 const char *filename; 419 int filenamelen, type; 420 struct tm tm; 421 time_t t; 422 int e; 423 424 us->size = -1; 425 us->atime = us->mtime = 0; 426 427 filename = ftp_filename(file, &filenamelen, &type, 0); 428 429 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 430 ftp_seterr(e); 431 return (-1); 432 } 433 434 e = ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); 435 if (e != FTP_FILE_STATUS) { 436 ftp_seterr(e); 437 return (-1); 438 } 439 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 440 /* nothing */ ; 441 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 442 us->size = us->size * 10 + *ln - '0'; 443 if (*ln && !isspace((unsigned char)*ln)) { 444 ftp_seterr(FTP_PROTOCOL_ERROR); 445 us->size = -1; 446 return (-1); 447 } 448 if (us->size == 0) 449 us->size = -1; 450 451 e = ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); 452 if (e != FTP_FILE_STATUS) { 453 ftp_seterr(e); 454 return (-1); 455 } 456 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 457 /* nothing */ ; 458 switch (strspn(ln, "0123456789")) { 459 case 14: 460 break; 461 case 15: 462 ln++; 463 ln[0] = '2'; 464 ln[1] = '0'; 465 break; 466 default: 467 ftp_seterr(FTP_PROTOCOL_ERROR); 468 return (-1); 469 } 470 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 471 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 472 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 473 ftp_seterr(FTP_PROTOCOL_ERROR); 474 return (-1); 475 } 476 tm.tm_mon--; 477 tm.tm_year -= 1900; 478 tm.tm_isdst = -1; 479 t = timegm(&tm); 480 if (t == (time_t)-1) 481 t = time(NULL); 482 us->mtime = t; 483 us->atime = t; 484 485 return (0); 486 } 487 488 /* 489 * I/O functions for FTP 490 */ 491 struct ftpio { 492 conn_t *cconn; /* Control connection */ 493 conn_t *dconn; /* Data connection */ 494 int dir; /* Direction */ 495 int eof; /* EOF reached */ 496 int err; /* Error code */ 497 }; 498 499 static ssize_t ftp_readfn(void *, void *, size_t); 500 static ssize_t ftp_writefn(void *, const void *, size_t); 501 static void ftp_closefn(void *); 502 503 static ssize_t 504 ftp_readfn(void *v, void *buf, size_t len) 505 { 506 struct ftpio *io; 507 int r; 508 509 io = (struct ftpio *)v; 510 if (io == NULL) { 511 errno = EBADF; 512 return (-1); 513 } 514 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 515 errno = EBADF; 516 return (-1); 517 } 518 if (io->err) { 519 errno = io->err; 520 return (-1); 521 } 522 if (io->eof) 523 return (0); 524 r = fetch_read(io->dconn, buf, len); 525 if (r > 0) 526 return (r); 527 if (r == 0) { 528 io->eof = 1; 529 return (0); 530 } 531 if (errno != EINTR) 532 io->err = errno; 533 return (-1); 534 } 535 536 static ssize_t 537 ftp_writefn(void *v, const void *buf, size_t len) 538 { 539 struct ftpio *io; 540 int w; 541 542 io = (struct ftpio *)v; 543 if (io == NULL) { 544 errno = EBADF; 545 return (-1); 546 } 547 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 548 errno = EBADF; 549 return (-1); 550 } 551 if (io->err) { 552 errno = io->err; 553 return (-1); 554 } 555 w = fetch_write(io->dconn, buf, len); 556 if (w >= 0) 557 return (w); 558 if (errno != EINTR) 559 io->err = errno; 560 return (-1); 561 } 562 563 static void 564 ftp_closefn(void *v) 565 { 566 struct ftpio *io; 567 int r; 568 569 io = (struct ftpio *)v; 570 if (io == NULL) { 571 errno = EBADF; 572 return; 573 } 574 if (io->dir == -1) 575 return; 576 if (io->cconn == NULL || io->dconn == NULL) { 577 errno = EBADF; 578 return; 579 } 580 fetch_close(io->dconn); 581 io->dir = -1; 582 io->dconn = NULL; 583 r = ftp_chkerr(io->cconn); 584 if (io->cconn == cached_connection && io->cconn->ref == 1) 585 cached_connection = NULL; 586 fetch_close(io->cconn); 587 free(io); 588 return; 589 } 590 591 static fetchIO * 592 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 593 { 594 struct ftpio *io; 595 fetchIO *f; 596 597 if (cconn == NULL || dconn == NULL) 598 return (NULL); 599 if ((io = malloc(sizeof(*io))) == NULL) 600 return (NULL); 601 io->cconn = cconn; 602 io->dconn = dconn; 603 io->dir = mode; 604 io->eof = io->err = 0; 605 f = fetchIO_unopen(io, ftp_readfn, ftp_writefn, ftp_closefn); 606 if (f == NULL) 607 free(io); 608 return (f); 609 } 610 611 /* 612 * Transfer file 613 */ 614 static fetchIO * 615 ftp_transfer(conn_t *conn, const char *oper, const char *file, const char *op_arg, 616 int mode, off_t offset, const char *flags) 617 { 618 struct sockaddr_storage sa; 619 struct sockaddr_in6 *sin6; 620 struct sockaddr_in *sin4; 621 const char *bindaddr; 622 const char *filename; 623 int filenamelen, type; 624 int low, pasv, verbose; 625 int e, sd = -1; 626 socklen_t l; 627 char *s; 628 fetchIO *df; 629 630 /* check flags */ 631 low = CHECK_FLAG('l'); 632 pasv = !CHECK_FLAG('a'); 633 verbose = CHECK_FLAG('v'); 634 635 /* passive mode */ 636 if (!pasv) 637 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 638 strncasecmp(s, "no", 2) != 0); 639 640 /* isolate filename */ 641 filename = ftp_filename(file, &filenamelen, &type, op_arg != NULL); 642 643 /* set transfer mode and data type */ 644 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 645 goto ouch; 646 647 /* find our own address, bind, and listen */ 648 l = sizeof(sa); 649 if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1) 650 goto sysouch; 651 if (sa.ss_family == AF_INET6) 652 unmappedaddr((struct sockaddr_in6 *)&sa, &l); 653 654 retry_mode: 655 656 /* open data socket */ 657 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 658 fetch_syserr(); 659 return (NULL); 660 } 661 662 if (pasv) { 663 unsigned char addr[64]; 664 char *ln, *p; 665 unsigned int i; 666 int port; 667 668 /* send PASV command */ 669 if (verbose) 670 fetch_info("setting passive mode"); 671 switch (sa.ss_family) { 672 case AF_INET: 673 if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 674 goto ouch; 675 break; 676 case AF_INET6: 677 if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 678 if (e == -1) 679 goto ouch; 680 if ((e = ftp_cmd(conn, "LPSV")) != 681 FTP_LPASSIVE_MODE) 682 goto ouch; 683 } 684 break; 685 default: 686 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 687 goto ouch; 688 } 689 690 /* 691 * Find address and port number. The reply to the PASV command 692 * is IMHO the one and only weak point in the FTP protocol. 693 */ 694 ln = conn->buf; 695 switch (e) { 696 case FTP_PASSIVE_MODE: 697 case FTP_LPASSIVE_MODE: 698 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 699 /* nothing */ ; 700 if (!*p) { 701 e = FTP_PROTOCOL_ERROR; 702 goto ouch; 703 } 704 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 705 for (i = 0; *p && i < l; i++, p++) 706 addr[i] = strtol(p, &p, 10); 707 if (i < l) { 708 e = FTP_PROTOCOL_ERROR; 709 goto ouch; 710 } 711 break; 712 case FTP_EPASSIVE_MODE: 713 for (p = ln + 3; *p && *p != '('; p++) 714 /* nothing */ ; 715 if (!*p) { 716 e = FTP_PROTOCOL_ERROR; 717 goto ouch; 718 } 719 ++p; 720 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 721 &port, &addr[3]) != 5 || 722 addr[0] != addr[1] || 723 addr[0] != addr[2] || addr[0] != addr[3]) { 724 e = FTP_PROTOCOL_ERROR; 725 goto ouch; 726 } 727 break; 728 case FTP_SYNTAX_ERROR: 729 if (verbose) 730 fetch_info("passive mode failed"); 731 /* Close socket and retry with passive mode. */ 732 pasv = 0; 733 close(sd); 734 sd = -1; 735 goto retry_mode; 736 } 737 738 /* seek to required offset */ 739 if (offset) 740 if (ftp_cmd(conn, "REST %lu", (unsigned long)offset) != FTP_FILE_OK) 741 goto sysouch; 742 743 /* construct sockaddr for data socket */ 744 l = sizeof(sa); 745 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 746 goto sysouch; 747 if (sa.ss_family == AF_INET6) 748 unmappedaddr((struct sockaddr_in6 *)&sa, &l); 749 switch (sa.ss_family) { 750 case AF_INET6: 751 sin6 = (struct sockaddr_in6 *)&sa; 752 if (e == FTP_EPASSIVE_MODE) 753 sin6->sin6_port = htons(port); 754 else { 755 memcpy(&sin6->sin6_addr, addr + 2, 16); 756 memcpy(&sin6->sin6_port, addr + 19, 2); 757 } 758 break; 759 case AF_INET: 760 sin4 = (struct sockaddr_in *)&sa; 761 if (e == FTP_EPASSIVE_MODE) 762 sin4->sin_port = htons(port); 763 else { 764 memcpy(&sin4->sin_addr, addr, 4); 765 memcpy(&sin4->sin_port, addr + 4, 2); 766 } 767 break; 768 default: 769 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 770 break; 771 } 772 773 /* connect to data port */ 774 if (verbose) 775 fetch_info("opening data connection"); 776 bindaddr = getenv("FETCH_BIND_ADDRESS"); 777 if (bindaddr != NULL && *bindaddr != '\0' && 778 fetch_bind(sd, sa.ss_family, bindaddr) != 0) 779 goto sysouch; 780 if (connect(sd, (struct sockaddr *)&sa, l) == -1) 781 goto sysouch; 782 783 /* make the server initiate the transfer */ 784 if (verbose) 785 fetch_info("initiating transfer"); 786 if (op_arg) 787 e = ftp_cmd(conn, "%s%s%s", oper, *op_arg ? " " : "", op_arg); 788 else 789 e = ftp_cmd(conn, "%s %.*s", oper, 790 filenamelen, filename); 791 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 792 goto ouch; 793 794 } else { 795 uint32_t a; 796 uint16_t p; 797 #if defined(IPV6_PORTRANGE) || defined(IP_PORTRANGE) 798 int arg; 799 #endif 800 int d; 801 char *ap; 802 char hname[INET6_ADDRSTRLEN]; 803 804 switch (sa.ss_family) { 805 case AF_INET6: 806 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 807 #ifdef IPV6_PORTRANGE 808 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 809 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 810 (char *)&arg, sizeof(arg)) == -1) 811 goto sysouch; 812 #endif 813 break; 814 case AF_INET: 815 ((struct sockaddr_in *)&sa)->sin_port = 0; 816 #ifdef IP_PORTRANGE 817 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 818 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 819 (char *)&arg, sizeof(arg)) == -1) 820 goto sysouch; 821 #endif 822 break; 823 } 824 if (verbose) 825 fetch_info("binding data socket"); 826 if (bind(sd, (struct sockaddr *)&sa, l) == -1) 827 goto sysouch; 828 if (listen(sd, 1) == -1) 829 goto sysouch; 830 831 /* find what port we're on and tell the server */ 832 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 833 goto sysouch; 834 switch (sa.ss_family) { 835 case AF_INET: 836 sin4 = (struct sockaddr_in *)&sa; 837 a = ntohl(sin4->sin_addr.s_addr); 838 p = ntohs(sin4->sin_port); 839 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 840 (a >> 24) & 0xff, (a >> 16) & 0xff, 841 (a >> 8) & 0xff, a & 0xff, 842 (p >> 8) & 0xff, p & 0xff); 843 break; 844 case AF_INET6: 845 #define UC(b) (((int)b)&0xff) 846 e = -1; 847 sin6 = (struct sockaddr_in6 *)&sa; 848 sin6->sin6_scope_id = 0; 849 if (getnameinfo((struct sockaddr *)&sa, l, 850 hname, sizeof(hname), 851 NULL, 0, NI_NUMERICHOST) == 0) { 852 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 853 htons(sin6->sin6_port)); 854 if (e == -1) 855 goto ouch; 856 } 857 if (e != FTP_OK) { 858 ap = (char *)&sin6->sin6_addr; 859 e = ftp_cmd(conn, 860 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 861 6, 16, 862 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 863 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 864 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 865 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 866 2, 867 (ntohs(sin6->sin6_port) >> 8) & 0xff, 868 ntohs(sin6->sin6_port) & 0xff); 869 } 870 break; 871 default: 872 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 873 goto ouch; 874 } 875 if (e != FTP_OK) 876 goto ouch; 877 878 /* seek to required offset */ 879 if (offset) 880 if (ftp_cmd(conn, "REST %llu", (unsigned long long)offset) != FTP_FILE_OK) 881 goto sysouch; 882 883 /* make the server initiate the transfer */ 884 if (verbose) 885 fetch_info("initiating transfer"); 886 if (op_arg) 887 e = ftp_cmd(conn, "%s%s%s", oper, *op_arg ? " " : "", op_arg); 888 else 889 e = ftp_cmd(conn, "%s %.*s", oper, 890 filenamelen, filename); 891 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 892 goto ouch; 893 894 /* accept the incoming connection and go to town */ 895 if ((d = accept(sd, NULL, NULL)) == -1) 896 goto sysouch; 897 close(sd); 898 sd = d; 899 } 900 901 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 902 goto sysouch; 903 return (df); 904 905 sysouch: 906 fetch_syserr(); 907 if (sd >= 0) 908 close(sd); 909 return (NULL); 910 911 ouch: 912 if (e != -1) 913 ftp_seterr(e); 914 if (sd >= 0) 915 close(sd); 916 return (NULL); 917 } 918 919 /* 920 * Authenticate 921 */ 922 static int 923 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 924 { 925 const char *user, *pwd, *login_name; 926 char pbuf[URL_USERLEN + 1 + URL_HOSTLEN + 1]; 927 int e, len; 928 929 /* XXX FTP_AUTH, and maybe .netrc */ 930 931 /* send user name and password */ 932 if (url->user[0] == '\0') 933 fetch_netrc_auth(url); 934 user = url->user; 935 if (*user == '\0') 936 user = getenv("FTP_LOGIN"); 937 if (user == NULL || *user == '\0') 938 user = FTP_ANONYMOUS_USER; 939 if (purl && url->port == fetch_default_port(url->scheme)) 940 e = ftp_cmd(conn, "USER %s@%s", user, url->host); 941 else if (purl) 942 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 943 else 944 e = ftp_cmd(conn, "USER %s", user); 945 946 /* did the server request a password? */ 947 if (e == FTP_NEED_PASSWORD) { 948 pwd = url->pwd; 949 if (*pwd == '\0') 950 pwd = getenv("FTP_PASSWORD"); 951 if (pwd == NULL || *pwd == '\0') { 952 if ((login_name = getlogin()) == 0) 953 login_name = FTP_ANONYMOUS_USER; 954 if ((len = snprintf(pbuf, URL_USERLEN + 2, "%s@", login_name)) < 0) 955 len = 0; 956 else if (len > URL_USERLEN + 1) 957 len = URL_USERLEN + 1; 958 gethostname(pbuf + len, sizeof(pbuf) - len); 959 /* MAXHOSTNAMELEN can differ from URL_HOSTLEN + 1 */ 960 pbuf[sizeof(pbuf) - 1] = '\0'; 961 pwd = pbuf; 962 } 963 e = ftp_cmd(conn, "PASS %s", pwd); 964 } 965 966 return (e); 967 } 968 969 /* 970 * Log on to FTP server 971 */ 972 static conn_t * 973 ftp_connect(struct url *url, struct url *purl, const char *flags) 974 { 975 conn_t *conn; 976 int e, direct, verbose; 977 #ifdef INET6 978 int af = AF_UNSPEC; 979 #else 980 int af = AF_INET; 981 #endif 982 983 direct = CHECK_FLAG('d'); 984 verbose = CHECK_FLAG('v'); 985 if (CHECK_FLAG('4')) 986 af = AF_INET; 987 else if (CHECK_FLAG('6')) 988 af = AF_INET6; 989 990 if (direct) 991 purl = NULL; 992 993 /* check for proxy */ 994 if (purl) { 995 /* XXX proxy authentication! */ 996 conn = fetch_connect(purl->host, purl->port, af, verbose); 997 } else { 998 /* no proxy, go straight to target */ 999 conn = fetch_connect(url->host, url->port, af, verbose); 1000 purl = NULL; 1001 } 1002 1003 /* check connection */ 1004 if (conn == NULL) 1005 /* fetch_connect() has already set an error code */ 1006 return (NULL); 1007 1008 /* expect welcome message */ 1009 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 1010 goto fouch; 1011 1012 /* authenticate */ 1013 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 1014 goto fouch; 1015 1016 /* TODO: Request extended features supported, if any (RFC 3659). */ 1017 1018 /* done */ 1019 return (conn); 1020 1021 fouch: 1022 if (e != -1) 1023 ftp_seterr(e); 1024 fetch_close(conn); 1025 return (NULL); 1026 } 1027 1028 /* 1029 * Disconnect from server 1030 */ 1031 static void 1032 ftp_disconnect(conn_t *conn) 1033 { 1034 (void)ftp_cmd(conn, "QUIT"); 1035 if (conn == cached_connection && conn->ref == 1) 1036 cached_connection = NULL; 1037 fetch_close(conn); 1038 } 1039 1040 /* 1041 * Check if we're already connected 1042 */ 1043 static int 1044 ftp_isconnected(struct url *url) 1045 { 1046 return (cached_connection 1047 && (strcmp(url->host, cached_host.host) == 0) 1048 && (strcmp(url->user, cached_host.user) == 0) 1049 && (strcmp(url->pwd, cached_host.pwd) == 0) 1050 && (url->port == cached_host.port)); 1051 } 1052 1053 /* 1054 * Check the cache, reconnect if no luck 1055 */ 1056 static conn_t * 1057 ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1058 { 1059 conn_t *conn; 1060 int e; 1061 1062 /* set default port */ 1063 if (!url->port) 1064 url->port = fetch_default_port(url->scheme); 1065 1066 /* try to use previously cached connection */ 1067 if (ftp_isconnected(url)) { 1068 e = ftp_cmd(cached_connection, "NOOP"); 1069 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1070 return (fetch_ref(cached_connection)); 1071 } 1072 1073 /* connect to server */ 1074 if ((conn = ftp_connect(url, purl, flags)) == NULL) 1075 return (NULL); 1076 if (cached_connection) 1077 ftp_disconnect(cached_connection); 1078 cached_connection = fetch_ref(conn); 1079 memcpy(&cached_host, url, sizeof(*url)); 1080 return (conn); 1081 } 1082 1083 /* 1084 * Check the proxy settings 1085 */ 1086 static struct url * 1087 ftp_get_proxy(struct url * url, const char *flags) 1088 { 1089 struct url *purl; 1090 char *p; 1091 1092 if (flags != NULL && strchr(flags, 'd') != NULL) 1093 return (NULL); 1094 if (fetch_no_proxy_match(url->host)) 1095 return (NULL); 1096 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1097 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1098 *p && (purl = fetchParseURL(p)) != NULL) { 1099 if (!*purl->scheme) { 1100 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1101 strcpy(purl->scheme, SCHEME_FTP); 1102 else 1103 strcpy(purl->scheme, SCHEME_HTTP); 1104 } 1105 if (!purl->port) 1106 purl->port = fetch_default_proxy_port(purl->scheme); 1107 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1108 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1109 return (purl); 1110 fetchFreeURL(purl); 1111 } 1112 return (NULL); 1113 } 1114 1115 /* 1116 * Process an FTP request 1117 */ 1118 fetchIO * 1119 ftp_request(struct url *url, const char *op, const char *op_arg, 1120 struct url_stat *us, struct url *purl, const char *flags) 1121 { 1122 fetchIO *f; 1123 char *path; 1124 conn_t *conn; 1125 int oflag; 1126 1127 /* check if we should use HTTP instead */ 1128 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1129 if (strcmp(op, "STAT") == 0) 1130 return (http_request(url, "HEAD", us, purl, flags)); 1131 else if (strcmp(op, "RETR") == 0) 1132 return (http_request(url, "GET", us, purl, flags)); 1133 /* 1134 * Our HTTP code doesn't support PUT requests yet, so try 1135 * a direct connection. 1136 */ 1137 } 1138 1139 /* connect to server */ 1140 conn = ftp_cached_connect(url, purl, flags); 1141 if (purl) 1142 fetchFreeURL(purl); 1143 if (conn == NULL) 1144 return (NULL); 1145 1146 if ((path = fetchUnquotePath(url)) == NULL) { 1147 fetch_syserr(); 1148 return NULL; 1149 } 1150 1151 /* change directory */ 1152 if (ftp_cwd(conn, path, op_arg != NULL) == -1) { 1153 free(path); 1154 return (NULL); 1155 } 1156 1157 /* stat file */ 1158 if (us && ftp_stat(conn, path, us) == -1 1159 && fetchLastErrCode != FETCH_PROTO 1160 && fetchLastErrCode != FETCH_UNAVAIL) { 1161 free(path); 1162 return (NULL); 1163 } 1164 1165 /* just a stat */ 1166 if (strcmp(op, "STAT") == 0) 1167 return fetchIO_unopen(NULL, NULL, NULL, NULL); 1168 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1169 oflag = O_WRONLY; 1170 else 1171 oflag = O_RDONLY; 1172 1173 /* initiate the transfer */ 1174 f = (ftp_transfer(conn, op, path, op_arg, oflag, url->offset, flags)); 1175 free(path); 1176 return f; 1177 } 1178 1179 /* 1180 * Get and stat file 1181 */ 1182 fetchIO * 1183 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1184 { 1185 return (ftp_request(url, "RETR", NULL, us, ftp_get_proxy(url, flags), flags)); 1186 } 1187 1188 /* 1189 * Get file 1190 */ 1191 fetchIO * 1192 fetchGetFTP(struct url *url, const char *flags) 1193 { 1194 return (fetchXGetFTP(url, NULL, flags)); 1195 } 1196 1197 /* 1198 * Put file 1199 */ 1200 fetchIO * 1201 fetchPutFTP(struct url *url, const char *flags) 1202 { 1203 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, NULL, 1204 ftp_get_proxy(url, flags), flags)); 1205 } 1206 1207 /* 1208 * Get file stats 1209 */ 1210 int 1211 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1212 { 1213 fetchIO *f; 1214 1215 f = ftp_request(url, "STAT", NULL, us, ftp_get_proxy(url, flags), flags); 1216 if (f == NULL) 1217 return (-1); 1218 fetchIO_close(f); 1219 return (0); 1220 } 1221 1222 /* 1223 * List a directory 1224 */ 1225 int 1226 fetchListFTP(struct url_list *ue, struct url *url, const char *pattern, const char *flags) 1227 { 1228 fetchIO *f; 1229 char buf[2 * PATH_MAX], *eol, *eos; 1230 ssize_t len; 1231 size_t cur_off; 1232 1233 /* XXX What about proxies? */ 1234 if (pattern == NULL || strcmp(pattern, "*") == 0) 1235 pattern = ""; 1236 f = ftp_request(url, "NLST", pattern, NULL, ftp_get_proxy(url, flags), flags); 1237 if (f == NULL) 1238 return -1; 1239 1240 cur_off = 0; 1241 while ((len = fetchIO_read(f, buf + cur_off, sizeof(buf) - cur_off)) > 0) { 1242 cur_off += len; 1243 while ((eol = memchr(buf, '\n', cur_off)) != NULL) { 1244 if (len == eol - buf) 1245 break; 1246 if (eol != buf) { 1247 if (eol[-1] == '\r') 1248 eos = eol - 1; 1249 else 1250 eos = eol; 1251 *eos = '\0'; 1252 fetch_add_entry(ue, url, buf, 0); 1253 cur_off -= eol - buf + 1; 1254 memmove(buf, eol + 1, cur_off); 1255 } 1256 } 1257 } 1258 if (cur_off != 0 || len < 0) { 1259 /* Not RFC conform, bail out. */ 1260 fetchIO_close(f); 1261 return -1; 1262 } 1263 fetchIO_close(f); 1264 return 0; 1265 } 1266