1 /* $NetBSD: ftp.c,v 1.1.1.2 2008/10/07 15:55:20 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('p'); 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 /* open data socket */ 655 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 656 fetch_syserr(); 657 return (NULL); 658 } 659 660 if (pasv) { 661 unsigned char addr[64]; 662 char *ln, *p; 663 unsigned int i; 664 int port; 665 666 /* send PASV command */ 667 if (verbose) 668 fetch_info("setting passive mode"); 669 switch (sa.ss_family) { 670 case AF_INET: 671 if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 672 goto ouch; 673 break; 674 case AF_INET6: 675 if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 676 if (e == -1) 677 goto ouch; 678 if ((e = ftp_cmd(conn, "LPSV")) != 679 FTP_LPASSIVE_MODE) 680 goto ouch; 681 } 682 break; 683 default: 684 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 685 goto ouch; 686 } 687 688 /* 689 * Find address and port number. The reply to the PASV command 690 * is IMHO the one and only weak point in the FTP protocol. 691 */ 692 ln = conn->buf; 693 switch (e) { 694 case FTP_PASSIVE_MODE: 695 case FTP_LPASSIVE_MODE: 696 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 697 /* nothing */ ; 698 if (!*p) { 699 e = FTP_PROTOCOL_ERROR; 700 goto ouch; 701 } 702 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 703 for (i = 0; *p && i < l; i++, p++) 704 addr[i] = strtol(p, &p, 10); 705 if (i < l) { 706 e = FTP_PROTOCOL_ERROR; 707 goto ouch; 708 } 709 break; 710 case FTP_EPASSIVE_MODE: 711 for (p = ln + 3; *p && *p != '('; p++) 712 /* nothing */ ; 713 if (!*p) { 714 e = FTP_PROTOCOL_ERROR; 715 goto ouch; 716 } 717 ++p; 718 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 719 &port, &addr[3]) != 5 || 720 addr[0] != addr[1] || 721 addr[0] != addr[2] || addr[0] != addr[3]) { 722 e = FTP_PROTOCOL_ERROR; 723 goto ouch; 724 } 725 break; 726 } 727 728 /* seek to required offset */ 729 if (offset) 730 if (ftp_cmd(conn, "REST %lu", (unsigned long)offset) != FTP_FILE_OK) 731 goto sysouch; 732 733 /* construct sockaddr for data socket */ 734 l = sizeof(sa); 735 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 736 goto sysouch; 737 if (sa.ss_family == AF_INET6) 738 unmappedaddr((struct sockaddr_in6 *)&sa, &l); 739 switch (sa.ss_family) { 740 case AF_INET6: 741 sin6 = (struct sockaddr_in6 *)&sa; 742 if (e == FTP_EPASSIVE_MODE) 743 sin6->sin6_port = htons(port); 744 else { 745 memcpy(&sin6->sin6_addr, addr + 2, 16); 746 memcpy(&sin6->sin6_port, addr + 19, 2); 747 } 748 break; 749 case AF_INET: 750 sin4 = (struct sockaddr_in *)&sa; 751 if (e == FTP_EPASSIVE_MODE) 752 sin4->sin_port = htons(port); 753 else { 754 memcpy(&sin4->sin_addr, addr, 4); 755 memcpy(&sin4->sin_port, addr + 4, 2); 756 } 757 break; 758 default: 759 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 760 break; 761 } 762 763 /* connect to data port */ 764 if (verbose) 765 fetch_info("opening data connection"); 766 bindaddr = getenv("FETCH_BIND_ADDRESS"); 767 if (bindaddr != NULL && *bindaddr != '\0' && 768 fetch_bind(sd, sa.ss_family, bindaddr) != 0) 769 goto sysouch; 770 if (connect(sd, (struct sockaddr *)&sa, l) == -1) 771 goto sysouch; 772 773 /* make the server initiate the transfer */ 774 if (verbose) 775 fetch_info("initiating transfer"); 776 if (op_arg) 777 e = ftp_cmd(conn, "%s%s%s", oper, *op_arg ? " " : "", op_arg); 778 else 779 e = ftp_cmd(conn, "%s %.*s", oper, 780 filenamelen, filename); 781 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 782 goto ouch; 783 784 } else { 785 uint32_t a; 786 uint16_t p; 787 #if defined(IPV6_PORTRANGE) || defined(IP_PORTRANGE) 788 int arg; 789 #endif 790 int d; 791 char *ap; 792 char hname[INET6_ADDRSTRLEN]; 793 794 switch (sa.ss_family) { 795 case AF_INET6: 796 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 797 #ifdef IPV6_PORTRANGE 798 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 799 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 800 (char *)&arg, sizeof(arg)) == -1) 801 goto sysouch; 802 #endif 803 break; 804 case AF_INET: 805 ((struct sockaddr_in *)&sa)->sin_port = 0; 806 #ifdef IP_PORTRANGE 807 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 808 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 809 (char *)&arg, sizeof(arg)) == -1) 810 goto sysouch; 811 #endif 812 break; 813 } 814 if (verbose) 815 fetch_info("binding data socket"); 816 if (bind(sd, (struct sockaddr *)&sa, l) == -1) 817 goto sysouch; 818 if (listen(sd, 1) == -1) 819 goto sysouch; 820 821 /* find what port we're on and tell the server */ 822 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 823 goto sysouch; 824 switch (sa.ss_family) { 825 case AF_INET: 826 sin4 = (struct sockaddr_in *)&sa; 827 a = ntohl(sin4->sin_addr.s_addr); 828 p = ntohs(sin4->sin_port); 829 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 830 (a >> 24) & 0xff, (a >> 16) & 0xff, 831 (a >> 8) & 0xff, a & 0xff, 832 (p >> 8) & 0xff, p & 0xff); 833 break; 834 case AF_INET6: 835 #define UC(b) (((int)b)&0xff) 836 e = -1; 837 sin6 = (struct sockaddr_in6 *)&sa; 838 sin6->sin6_scope_id = 0; 839 if (getnameinfo((struct sockaddr *)&sa, l, 840 hname, sizeof(hname), 841 NULL, 0, NI_NUMERICHOST) == 0) { 842 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 843 htons(sin6->sin6_port)); 844 if (e == -1) 845 goto ouch; 846 } 847 if (e != FTP_OK) { 848 ap = (char *)&sin6->sin6_addr; 849 e = ftp_cmd(conn, 850 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 851 6, 16, 852 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 853 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 854 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 855 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 856 2, 857 (ntohs(sin6->sin6_port) >> 8) & 0xff, 858 ntohs(sin6->sin6_port) & 0xff); 859 } 860 break; 861 default: 862 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 863 goto ouch; 864 } 865 if (e != FTP_OK) 866 goto ouch; 867 868 /* seek to required offset */ 869 if (offset) 870 if (ftp_cmd(conn, "REST %llu", (unsigned long long)offset) != FTP_FILE_OK) 871 goto sysouch; 872 873 /* make the server initiate the transfer */ 874 if (verbose) 875 fetch_info("initiating transfer"); 876 if (op_arg) 877 e = ftp_cmd(conn, "%s%s%s", oper, *op_arg ? " " : "", op_arg); 878 else 879 e = ftp_cmd(conn, "%s %.*s", oper, 880 filenamelen, filename); 881 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 882 goto ouch; 883 884 /* accept the incoming connection and go to town */ 885 if ((d = accept(sd, NULL, NULL)) == -1) 886 goto sysouch; 887 close(sd); 888 sd = d; 889 } 890 891 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 892 goto sysouch; 893 return (df); 894 895 sysouch: 896 fetch_syserr(); 897 if (sd >= 0) 898 close(sd); 899 return (NULL); 900 901 ouch: 902 if (e != -1) 903 ftp_seterr(e); 904 if (sd >= 0) 905 close(sd); 906 return (NULL); 907 } 908 909 /* 910 * Authenticate 911 */ 912 static int 913 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 914 { 915 const char *user, *pwd, *login_name; 916 char pbuf[URL_USERLEN + 1 + URL_HOSTLEN + 1]; 917 int e, len; 918 919 /* XXX FTP_AUTH, and maybe .netrc */ 920 921 /* send user name and password */ 922 if (url->user[0] == '\0') 923 fetch_netrc_auth(url); 924 user = url->user; 925 if (*user == '\0') 926 user = getenv("FTP_LOGIN"); 927 if (user == NULL || *user == '\0') 928 user = FTP_ANONYMOUS_USER; 929 if (purl && url->port == fetch_default_port(url->scheme)) 930 e = ftp_cmd(conn, "USER %s@%s", user, url->host); 931 else if (purl) 932 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 933 else 934 e = ftp_cmd(conn, "USER %s", user); 935 936 /* did the server request a password? */ 937 if (e == FTP_NEED_PASSWORD) { 938 pwd = url->pwd; 939 if (*pwd == '\0') 940 pwd = getenv("FTP_PASSWORD"); 941 if (pwd == NULL || *pwd == '\0') { 942 if ((login_name = getlogin()) == 0) 943 login_name = FTP_ANONYMOUS_USER; 944 if ((len = snprintf(pbuf, URL_USERLEN + 2, "%s@", login_name)) < 0) 945 len = 0; 946 else if (len > URL_USERLEN + 1) 947 len = URL_USERLEN + 1; 948 gethostname(pbuf + len, sizeof(pbuf) - len); 949 /* MAXHOSTNAMELEN can differ from URL_HOSTLEN + 1 */ 950 pbuf[sizeof(pbuf) - 1] = '\0'; 951 pwd = pbuf; 952 } 953 e = ftp_cmd(conn, "PASS %s", pwd); 954 } 955 956 return (e); 957 } 958 959 /* 960 * Log on to FTP server 961 */ 962 static conn_t * 963 ftp_connect(struct url *url, struct url *purl, const char *flags) 964 { 965 conn_t *conn; 966 int e, direct, verbose; 967 #ifdef INET6 968 int af = AF_UNSPEC; 969 #else 970 int af = AF_INET; 971 #endif 972 973 direct = CHECK_FLAG('d'); 974 verbose = CHECK_FLAG('v'); 975 if (CHECK_FLAG('4')) 976 af = AF_INET; 977 else if (CHECK_FLAG('6')) 978 af = AF_INET6; 979 980 if (direct) 981 purl = NULL; 982 983 /* check for proxy */ 984 if (purl) { 985 /* XXX proxy authentication! */ 986 conn = fetch_connect(purl->host, purl->port, af, verbose); 987 } else { 988 /* no proxy, go straight to target */ 989 conn = fetch_connect(url->host, url->port, af, verbose); 990 purl = NULL; 991 } 992 993 /* check connection */ 994 if (conn == NULL) 995 /* fetch_connect() has already set an error code */ 996 return (NULL); 997 998 /* expect welcome message */ 999 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 1000 goto fouch; 1001 1002 /* authenticate */ 1003 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 1004 goto fouch; 1005 1006 /* TODO: Request extended features supported, if any (RFC 3659). */ 1007 1008 /* done */ 1009 return (conn); 1010 1011 fouch: 1012 if (e != -1) 1013 ftp_seterr(e); 1014 fetch_close(conn); 1015 return (NULL); 1016 } 1017 1018 /* 1019 * Disconnect from server 1020 */ 1021 static void 1022 ftp_disconnect(conn_t *conn) 1023 { 1024 (void)ftp_cmd(conn, "QUIT"); 1025 if (conn == cached_connection && conn->ref == 1) 1026 cached_connection = NULL; 1027 fetch_close(conn); 1028 } 1029 1030 /* 1031 * Check if we're already connected 1032 */ 1033 static int 1034 ftp_isconnected(struct url *url) 1035 { 1036 return (cached_connection 1037 && (strcmp(url->host, cached_host.host) == 0) 1038 && (strcmp(url->user, cached_host.user) == 0) 1039 && (strcmp(url->pwd, cached_host.pwd) == 0) 1040 && (url->port == cached_host.port)); 1041 } 1042 1043 /* 1044 * Check the cache, reconnect if no luck 1045 */ 1046 static conn_t * 1047 ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1048 { 1049 conn_t *conn; 1050 int e; 1051 1052 /* set default port */ 1053 if (!url->port) 1054 url->port = fetch_default_port(url->scheme); 1055 1056 /* try to use previously cached connection */ 1057 if (ftp_isconnected(url)) { 1058 e = ftp_cmd(cached_connection, "NOOP"); 1059 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1060 return (fetch_ref(cached_connection)); 1061 } 1062 1063 /* connect to server */ 1064 if ((conn = ftp_connect(url, purl, flags)) == NULL) 1065 return (NULL); 1066 if (cached_connection) 1067 ftp_disconnect(cached_connection); 1068 cached_connection = fetch_ref(conn); 1069 memcpy(&cached_host, url, sizeof(*url)); 1070 return (conn); 1071 } 1072 1073 /* 1074 * Check the proxy settings 1075 */ 1076 static struct url * 1077 ftp_get_proxy(struct url * url, const char *flags) 1078 { 1079 struct url *purl; 1080 char *p; 1081 1082 if (flags != NULL && strchr(flags, 'd') != NULL) 1083 return (NULL); 1084 if (fetch_no_proxy_match(url->host)) 1085 return (NULL); 1086 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1087 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1088 *p && (purl = fetchParseURL(p)) != NULL) { 1089 if (!*purl->scheme) { 1090 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1091 strcpy(purl->scheme, SCHEME_FTP); 1092 else 1093 strcpy(purl->scheme, SCHEME_HTTP); 1094 } 1095 if (!purl->port) 1096 purl->port = fetch_default_proxy_port(purl->scheme); 1097 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1098 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1099 return (purl); 1100 fetchFreeURL(purl); 1101 } 1102 return (NULL); 1103 } 1104 1105 /* 1106 * Process an FTP request 1107 */ 1108 fetchIO * 1109 ftp_request(struct url *url, const char *op, const char *op_arg, 1110 struct url_stat *us, struct url *purl, const char *flags) 1111 { 1112 fetchIO *f; 1113 char *path; 1114 conn_t *conn; 1115 int oflag; 1116 1117 /* check if we should use HTTP instead */ 1118 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1119 if (strcmp(op, "STAT") == 0) 1120 return (http_request(url, "HEAD", us, purl, flags)); 1121 else if (strcmp(op, "RETR") == 0) 1122 return (http_request(url, "GET", us, purl, flags)); 1123 /* 1124 * Our HTTP code doesn't support PUT requests yet, so try 1125 * a direct connection. 1126 */ 1127 } 1128 1129 /* connect to server */ 1130 conn = ftp_cached_connect(url, purl, flags); 1131 if (purl) 1132 fetchFreeURL(purl); 1133 if (conn == NULL) 1134 return (NULL); 1135 1136 if ((path = fetchUnquotePath(url)) == NULL) { 1137 fetch_syserr(); 1138 return NULL; 1139 } 1140 1141 /* change directory */ 1142 if (ftp_cwd(conn, path, op_arg != NULL) == -1) { 1143 free(path); 1144 return (NULL); 1145 } 1146 1147 /* stat file */ 1148 if (us && ftp_stat(conn, path, us) == -1 1149 && fetchLastErrCode != FETCH_PROTO 1150 && fetchLastErrCode != FETCH_UNAVAIL) { 1151 free(path); 1152 return (NULL); 1153 } 1154 1155 /* just a stat */ 1156 if (strcmp(op, "STAT") == 0) 1157 return fetchIO_unopen(NULL, NULL, NULL, NULL); 1158 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1159 oflag = O_WRONLY; 1160 else 1161 oflag = O_RDONLY; 1162 1163 /* initiate the transfer */ 1164 f = (ftp_transfer(conn, op, path, op_arg, oflag, url->offset, flags)); 1165 free(path); 1166 return f; 1167 } 1168 1169 /* 1170 * Get and stat file 1171 */ 1172 fetchIO * 1173 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1174 { 1175 return (ftp_request(url, "RETR", NULL, us, ftp_get_proxy(url, flags), flags)); 1176 } 1177 1178 /* 1179 * Get file 1180 */ 1181 fetchIO * 1182 fetchGetFTP(struct url *url, const char *flags) 1183 { 1184 return (fetchXGetFTP(url, NULL, flags)); 1185 } 1186 1187 /* 1188 * Put file 1189 */ 1190 fetchIO * 1191 fetchPutFTP(struct url *url, const char *flags) 1192 { 1193 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, NULL, 1194 ftp_get_proxy(url, flags), flags)); 1195 } 1196 1197 /* 1198 * Get file stats 1199 */ 1200 int 1201 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1202 { 1203 fetchIO *f; 1204 1205 f = ftp_request(url, "STAT", NULL, us, ftp_get_proxy(url, flags), flags); 1206 if (f == NULL) 1207 return (-1); 1208 fetchIO_close(f); 1209 return (0); 1210 } 1211 1212 /* 1213 * List a directory 1214 */ 1215 int 1216 fetchListFTP(struct url_list *ue, struct url *url, const char *pattern, const char *flags) 1217 { 1218 fetchIO *f; 1219 char buf[2 * PATH_MAX], *eol, *eos; 1220 ssize_t len; 1221 size_t cur_off; 1222 1223 /* XXX What about proxies? */ 1224 if (pattern == NULL || strcmp(pattern, "*") == 0) 1225 pattern = ""; 1226 f = ftp_request(url, "NLST", pattern, NULL, ftp_get_proxy(url, flags), flags); 1227 if (f == NULL) 1228 return -1; 1229 1230 cur_off = 0; 1231 while ((len = fetchIO_read(f, buf + cur_off, sizeof(buf) - cur_off)) > 0) { 1232 cur_off += len; 1233 while ((eol = memchr(buf, '\n', cur_off)) != NULL) { 1234 if (len == eol - buf) 1235 break; 1236 if (eol != buf) { 1237 if (eol[-1] == '\r') 1238 eos = eol - 1; 1239 else 1240 eos = eol; 1241 *eos = '\0'; 1242 fetch_add_entry(ue, url, buf, 0); 1243 cur_off -= eol - buf + 1; 1244 memmove(buf, eol + 1, cur_off); 1245 } 1246 } 1247 } 1248 if (cur_off != 0 || len < 0) { 1249 /* Not RFC conform, bail out. */ 1250 fetchIO_close(f); 1251 return -1; 1252 } 1253 fetchIO_close(f); 1254 return 0; 1255 } 1256