1 /*- 2 * Copyright (c) 1998-2004 Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "free2net.h" 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD: src/lib/libfetch/ftp.c,v 1.91.2.2 2007/05/16 07:04:02 njl Exp $"); 33 34 /* 35 * Portions of this code were taken from or based on ftpio.c: 36 * 37 * ---------------------------------------------------------------------------- 38 * "THE BEER-WARE LICENSE" (Revision 42): 39 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you 40 * can do whatever you want with this stuff. If we meet some day, and you think 41 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 42 * ---------------------------------------------------------------------------- 43 * 44 * Major Changelog: 45 * 46 * Dag-Erling Co�dan Sm�rgrav 47 * 9 Jun 1998 48 * 49 * Incorporated into libfetch 50 * 51 * Jordan K. Hubbard 52 * 17 Jan 1996 53 * 54 * Turned inside out. Now returns xfers as new file ids, not as a special 55 * `state' of FTP_t 56 * 57 * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $ 58 * 59 */ 60 61 #include <sys/param.h> 62 #include <sys/socket.h> 63 #include <netinet/in.h> 64 65 #include <ctype.h> 66 #include <err.h> 67 #include <errno.h> 68 #include <fcntl.h> 69 #include <netdb.h> 70 #include <stdarg.h> 71 #include <stdint.h> 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <time.h> 76 #include <unistd.h> 77 78 #include "fetch.h" 79 #include "common.h" 80 #include "ftperr.h" 81 82 #define FTP_ANONYMOUS_USER "anonymous" 83 84 #define FTP_CONNECTION_ALREADY_OPEN 125 85 #define FTP_OPEN_DATA_CONNECTION 150 86 #define FTP_OK 200 87 #define FTP_FILE_STATUS 213 88 #define FTP_SERVICE_READY 220 89 #define FTP_TRANSFER_COMPLETE 226 90 #define FTP_PASSIVE_MODE 227 91 #define FTP_LPASSIVE_MODE 228 92 #define FTP_EPASSIVE_MODE 229 93 #define FTP_LOGGED_IN 230 94 #define FTP_FILE_ACTION_OK 250 95 #define FTP_DIRECTORY_CREATED 257 /* multiple meanings */ 96 #define FTP_FILE_CREATED 257 /* multiple meanings */ 97 #define FTP_WORKING_DIRECTORY 257 /* multiple meanings */ 98 #define FTP_NEED_PASSWORD 331 99 #define FTP_NEED_ACCOUNT 332 100 #define FTP_FILE_OK 350 101 #define FTP_SYNTAX_ERROR 500 102 #define FTP_PROTOCOL_ERROR 999 103 104 static struct url cached_host; 105 static conn_t *cached_connection; 106 107 #define isftpreply(foo) (isdigit((unsigned)foo[0]) && \ 108 isdigit((unsigned)foo[1]) && \ 109 isdigit((unsigned)foo[2]) && \ 110 (foo[3] == ' ' || foo[3] == '\0')) 111 #define isftpinfo(foo) (isdigit((unsigned)foo[0]) && \ 112 isdigit((unsigned)foo[1]) && \ 113 isdigit((unsigned)foo[2]) && foo[3] == '-') 114 115 /* 116 * Translate IPv4 mapped IPv6 address to IPv4 address 117 */ 118 static void 119 unmappedaddr(struct sockaddr_in6 *sin6) 120 { 121 struct sockaddr_in *sin4; 122 u_int32_t addr; 123 int port; 124 125 if (sin6->sin6_family != AF_INET6 || 126 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 127 return; 128 sin4 = (struct sockaddr_in *)(void *)sin6; 129 addr = *(u_int32_t *)(void *)&sin6->sin6_addr.s6_addr[12]; 130 port = sin6->sin6_port; 131 memset(sin4, 0, sizeof(struct sockaddr_in)); 132 sin4->sin_addr.s_addr = addr; 133 sin4->sin_port = port; 134 sin4->sin_family = AF_INET; 135 sin4->sin_len = sizeof(struct sockaddr_in); 136 } 137 138 /* 139 * Get server response 140 */ 141 static int 142 _ftp_chkerr(conn_t *conn) 143 { 144 if (_fetch_getln(conn) == -1) { 145 _fetch_syserr(); 146 return (-1); 147 } 148 if (isftpinfo(conn->buf)) { 149 while (conn->buflen && !isftpreply(conn->buf)) { 150 if (_fetch_getln(conn) == -1) { 151 _fetch_syserr(); 152 return (-1); 153 } 154 } 155 } 156 157 while (conn->buflen && isspace((unsigned)conn->buf[conn->buflen - 1])) 158 conn->buflen--; 159 conn->buf[conn->buflen] = '\0'; 160 161 if (!isftpreply(conn->buf)) { 162 _ftp_seterr(FTP_PROTOCOL_ERROR); 163 return (-1); 164 } 165 166 conn->err = (conn->buf[0] - '0') * 100 167 + (conn->buf[1] - '0') * 10 168 + (conn->buf[2] - '0'); 169 170 return (conn->err); 171 } 172 173 /* 174 * Send a command and check reply 175 */ 176 static int 177 _ftp_cmd(conn_t *conn, const char *fmt, ...) 178 { 179 va_list ap; 180 size_t len; 181 char *msg; 182 int r; 183 184 va_start(ap, fmt); 185 len = vasprintf(&msg, fmt, ap); 186 va_end(ap); 187 188 if (msg == NULL) { 189 errno = ENOMEM; 190 _fetch_syserr(); 191 return (-1); 192 } 193 194 r = _fetch_putln(conn, msg, len); 195 free(msg); 196 197 if (r == -1) { 198 _fetch_syserr(); 199 return (-1); 200 } 201 202 return (_ftp_chkerr(conn)); 203 } 204 205 /* 206 * Return a pointer to the filename part of a path 207 */ 208 static const char * 209 _ftp_filename(const char *file, int *len, int *type) 210 { 211 const char *s; 212 213 if ((s = strrchr(file, '/')) == NULL) 214 s = file; 215 else 216 s = s + 1; 217 *len = strlen(s); 218 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 219 *type = s[*len - 1]; 220 *len -= 7; 221 } else { 222 *type = '\0'; 223 } 224 return (s); 225 } 226 227 /* 228 * Get current working directory from the reply to a CWD, PWD or CDUP 229 * command. 230 */ 231 static int 232 _ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen) 233 { 234 char *src, *dst, *end; 235 int q; 236 237 if (conn->err != FTP_WORKING_DIRECTORY && 238 conn->err != FTP_FILE_ACTION_OK) 239 return (FTP_PROTOCOL_ERROR); 240 end = conn->buf + conn->buflen; 241 src = conn->buf + 4; 242 if (src >= end || *src++ != '"') 243 return (FTP_PROTOCOL_ERROR); 244 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { 245 if (!q && *src == '"') 246 q = 1; 247 else if (q && *src != '"') 248 break; 249 else if (q) 250 *dst++ = '"', q = 0; 251 else 252 *dst++ = *src; 253 } 254 if (!pwdlen) 255 return (FTP_PROTOCOL_ERROR); 256 *dst = '\0'; 257 #if 0 258 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); 259 #endif 260 return (FTP_OK); 261 } 262 263 /* 264 * Change working directory to the directory that contains the specified 265 * file. 266 */ 267 static int 268 _ftp_cwd(conn_t *conn, const char *file) 269 { 270 const char *beg, *end; 271 char pwd[PATH_MAX]; 272 int e, i, len; 273 274 /* If no slashes in name, no need to change dirs. */ 275 if ((end = strrchr(file, '/')) == NULL) 276 return (0); 277 if ((e = _ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 278 (e = _ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 279 _ftp_seterr(e); 280 return (-1); 281 } 282 for (;;) { 283 len = strlen(pwd); 284 285 /* Look for a common prefix between PWD and dir to fetch. */ 286 for (i = 0; i <= len && i <= end - file; ++i) 287 if (pwd[i] != file[i]) 288 break; 289 #if 0 290 DEBUG(fprintf(stderr, "have: [%.*s|%s]\n", i, pwd, pwd + i)); 291 DEBUG(fprintf(stderr, "want: [%.*s|%s]\n", i, file, file + i)); 292 #endif 293 /* Keep going up a dir until we have a matching prefix. */ 294 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) 295 break; 296 if ((e = _ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || 297 (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 } 303 304 #ifdef FTP_COMBINE_CWDS 305 /* Skip leading slashes, even "////". */ 306 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) 307 /* nothing */ ; 308 309 /* If there is no trailing dir, we're already there. */ 310 if (beg >= end) 311 return (0); 312 313 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 314 e = _ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); 315 if (e == FTP_FILE_ACTION_OK) 316 return (0); 317 #endif /* FTP_COMBINE_CWDS */ 318 319 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 320 for (beg = file + i; beg < end; beg = file + i + 1) { 321 while (*beg == '/') 322 ++beg, ++i; 323 for (++i; file + i < end && file[i] != '/'; ++i) 324 /* nothing */ ; 325 e = _ftp_cmd(conn, "CWD %.*s", file + i - beg, beg); 326 if (e != FTP_FILE_ACTION_OK) { 327 _ftp_seterr(e); 328 return (-1); 329 } 330 } 331 return (0); 332 } 333 334 /* 335 * Set transfer mode and data type 336 */ 337 static int 338 _ftp_mode_type(conn_t *conn, int mode, int type) 339 { 340 int e; 341 342 switch (mode) { 343 case 0: 344 case 's': 345 mode = 'S'; 346 /* FALLTHROUGH */ 347 case 'S': 348 break; 349 default: 350 return (FTP_PROTOCOL_ERROR); 351 } 352 if ((e = _ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { 353 if (mode == 'S') { 354 /* 355 * Stream mode is supposed to be the default - so 356 * much so that some servers not only do not 357 * support any other mode, but do not support the 358 * MODE command at all. 359 * 360 * If "MODE S" fails, it is unlikely that we 361 * previously succeeded in setting a different 362 * mode. Therefore, we simply hope that the 363 * server is already in the correct mode, and 364 * silently ignore the failure. 365 */ 366 } else { 367 return (e); 368 } 369 } 370 371 switch (type) { 372 case 0: 373 case 'i': 374 type = 'I'; 375 /* FALLTHROUGH */ 376 case 'I': 377 break; 378 case 'a': 379 type = 'A'; 380 /* FALLTHROUGH */ 381 case 'A': 382 break; 383 case 'd': 384 type = 'D'; 385 /* FALLTHROUGH */ 386 case 'D': 387 /* can't handle yet */ 388 default: 389 return (FTP_PROTOCOL_ERROR); 390 } 391 if ((e = _ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) 392 return (e); 393 394 return (FTP_OK); 395 } 396 397 /* 398 * Request and parse file stats 399 */ 400 static int 401 _ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 402 { 403 char *ln; 404 const char *filename; 405 int filenamelen, type; 406 struct tm tm; 407 time_t t; 408 int e; 409 410 us->size = -1; 411 us->atime = us->mtime = 0; 412 413 filename = _ftp_filename(file, &filenamelen, &type); 414 415 if ((e = _ftp_mode_type(conn, 0, type)) != FTP_OK) { 416 _ftp_seterr(e); 417 return (-1); 418 } 419 420 e = _ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); 421 if (e != FTP_FILE_STATUS) { 422 _ftp_seterr(e); 423 return (-1); 424 } 425 for (ln = conn->buf + 4; *ln && isspace((unsigned)*ln); ln++) 426 /* nothing */ ; 427 for (us->size = 0; *ln && isdigit((unsigned)*ln); ln++) 428 us->size = us->size * 10 + *ln - '0'; 429 if (*ln && !isspace((unsigned)*ln)) { 430 _ftp_seterr(FTP_PROTOCOL_ERROR); 431 us->size = -1; 432 return (-1); 433 } 434 if (us->size == 0) 435 us->size = -1; 436 DEBUG(fprintf(stderr, "size: [%lld]\n", (long long)us->size)); 437 438 e = _ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); 439 if (e != FTP_FILE_STATUS) { 440 _ftp_seterr(e); 441 return (-1); 442 } 443 for (ln = conn->buf + 4; *ln && isspace((unsigned)*ln); ln++) 444 /* nothing */ ; 445 switch (strspn(ln, "0123456789")) { 446 case 14: 447 break; 448 case 15: 449 ln++; 450 ln[0] = '2'; 451 ln[1] = '0'; 452 break; 453 default: 454 _ftp_seterr(FTP_PROTOCOL_ERROR); 455 return (-1); 456 } 457 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 458 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 459 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 460 _ftp_seterr(FTP_PROTOCOL_ERROR); 461 return (-1); 462 } 463 tm.tm_mon--; 464 tm.tm_year -= 1900; 465 tm.tm_isdst = -1; 466 t = timegm(&tm); 467 if (t == (time_t)-1) 468 t = time(NULL); 469 us->mtime = t; 470 us->atime = t; 471 DEBUG(fprintf(stderr, 472 "last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", 473 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 474 tm.tm_hour, tm.tm_min, tm.tm_sec)); 475 return (0); 476 } 477 478 /* 479 * I/O functions for FTP 480 */ 481 struct ftpio { 482 conn_t *cconn; /* Control connection */ 483 conn_t *dconn; /* Data connection */ 484 int dir; /* Direction */ 485 int eof; /* EOF reached */ 486 int err; /* Error code */ 487 }; 488 489 static int _ftp_readfn(void *, char *, int); 490 static int _ftp_writefn(void *, const char *, int); 491 static fpos_t _ftp_seekfn(void *, fpos_t, int); 492 static int _ftp_closefn(void *); 493 494 static int 495 _ftp_readfn(void *v, char *buf, int len) 496 { 497 struct ftpio *io; 498 int r; 499 500 io = (struct ftpio *)v; 501 if (io == NULL) { 502 errno = EBADF; 503 return (-1); 504 } 505 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 506 errno = EBADF; 507 return (-1); 508 } 509 if (io->err) { 510 errno = io->err; 511 return (-1); 512 } 513 if (io->eof) 514 return (0); 515 r = _fetch_read(io->dconn, buf, (unsigned)len); 516 if (r > 0) 517 return (r); 518 if (r == 0) { 519 io->eof = 1; 520 return (0); 521 } 522 if (errno != EINTR) 523 io->err = errno; 524 return (-1); 525 } 526 527 static int 528 _ftp_writefn(void *v, const char *buf, int len) 529 { 530 struct ftpio *io; 531 int w; 532 533 io = (struct ftpio *)v; 534 if (io == NULL) { 535 errno = EBADF; 536 return (-1); 537 } 538 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 539 errno = EBADF; 540 return (-1); 541 } 542 if (io->err) { 543 errno = io->err; 544 return (-1); 545 } 546 w = _fetch_write(io->dconn, buf, (unsigned)len); 547 if (w >= 0) 548 return (w); 549 if (errno != EINTR) 550 io->err = errno; 551 return (-1); 552 } 553 554 /* ARGSUSED1 */ 555 static fpos_t 556 _ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 557 { 558 struct ftpio *io; 559 560 io = (struct ftpio *)v; 561 if (io == NULL) { 562 errno = EBADF; 563 return (-1); 564 } 565 errno = ESPIPE; 566 return (-1); 567 } 568 569 static int 570 _ftp_closefn(void *v) 571 { 572 struct ftpio *io; 573 int r; 574 575 io = (struct ftpio *)v; 576 if (io == NULL) { 577 errno = EBADF; 578 return (-1); 579 } 580 if (io->dir == -1) 581 return (0); 582 if (io->cconn == NULL || io->dconn == NULL) { 583 errno = EBADF; 584 return (-1); 585 } 586 _fetch_close(io->dconn); 587 io->dir = -1; 588 io->dconn = NULL; 589 DEBUG(fprintf(stderr, "Waiting for final status\n")); 590 r = _ftp_chkerr(io->cconn); 591 if (io->cconn == cached_connection && io->cconn->ref == 1) 592 cached_connection = NULL; 593 _fetch_close(io->cconn); 594 free(io); 595 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 596 } 597 598 static FILE * 599 _ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 600 { 601 struct ftpio *io; 602 FILE *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 = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn); 613 if (f == NULL) 614 free(io); 615 return (f); 616 } 617 618 /* 619 * Transfer file 620 */ 621 static FILE * 622 _ftp_transfer(conn_t *conn, const char *oper, const char *file, 623 int mode, off_t offset, const char *flags) 624 { 625 struct sockaddr_storage sa; 626 struct sockaddr_in6 *sin6; 627 struct sockaddr_in *sin4; 628 const char *bindaddr; 629 const char *filename; 630 int filenamelen, type; 631 int low, pasv, verbose; 632 int e, sd = -1; 633 socklen_t l; 634 char *s; 635 FILE *df; 636 637 /* check flags */ 638 low = CHECK_FLAG('l'); 639 pasv = CHECK_FLAG('p'); 640 verbose = CHECK_FLAG('v'); 641 642 /* passive mode */ 643 if (!pasv) 644 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 645 strncasecmp(s, "no", 2) != 0); 646 647 /* isolate filename */ 648 filename = _ftp_filename(file, &filenamelen, &type); 649 650 /* set transfer mode and data type */ 651 if ((e = _ftp_mode_type(conn, 0, type)) != FTP_OK) 652 goto ouch; 653 654 /* find our own address, bind, and listen */ 655 l = sizeof(sa); 656 if (getsockname(conn->sd, (struct sockaddr *)(void *)&sa, &l) == -1) 657 goto sysouch; 658 if (sa.ss_family == AF_INET6) 659 unmappedaddr((struct sockaddr_in6 *)(void *)&sa); 660 661 /* open data socket */ 662 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 663 _fetch_syserr(); 664 return (NULL); 665 } 666 667 if (pasv) { 668 u_char addr[64]; 669 char *ln, *p; 670 unsigned int i; 671 int port; 672 673 /* send PASV command */ 674 if (verbose) 675 _fetch_info("setting passive mode"); 676 switch (sa.ss_family) { 677 case AF_INET: 678 if ((e = _ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 679 goto ouch; 680 break; 681 case AF_INET6: 682 if ((e = _ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 683 if (e == -1) 684 goto ouch; 685 if ((e = _ftp_cmd(conn, "LPSV")) != 686 FTP_LPASSIVE_MODE) 687 goto ouch; 688 } 689 break; 690 default: 691 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 692 goto ouch; 693 } 694 695 /* 696 * Find address and port number. The reply to the PASV command 697 * is IMHO the one and only weak point in the FTP protocol. 698 */ 699 ln = conn->buf; 700 switch (e) { 701 case FTP_PASSIVE_MODE: 702 case FTP_LPASSIVE_MODE: 703 for (p = ln + 3; *p && !isdigit((unsigned)*p); p++) 704 /* nothing */ ; 705 if (!*p) { 706 e = FTP_PROTOCOL_ERROR; 707 goto ouch; 708 } 709 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 710 for (i = 0; *p && i < l; i++, p++) 711 addr[i] = (unsigned char) strtol(p, &p, 10); 712 if (i < l) { 713 e = FTP_PROTOCOL_ERROR; 714 goto ouch; 715 } 716 break; 717 case FTP_EPASSIVE_MODE: 718 for (p = ln + 3; *p && *p != '('; p++) 719 /* nothing */ ; 720 if (!*p) { 721 e = FTP_PROTOCOL_ERROR; 722 goto ouch; 723 } 724 ++p; 725 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 726 &port, &addr[3]) != 5 || 727 addr[0] != addr[1] || 728 addr[0] != addr[2] || addr[0] != addr[3]) { 729 e = FTP_PROTOCOL_ERROR; 730 goto ouch; 731 } 732 break; 733 } 734 735 /* seek to required offset */ 736 if (offset) 737 if (_ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) 738 goto sysouch; 739 740 /* construct sockaddr for data socket */ 741 l = sizeof(sa); 742 if (getpeername(conn->sd, (struct sockaddr *)(void *)&sa, &l) == -1) 743 goto sysouch; 744 if (sa.ss_family == AF_INET6) 745 unmappedaddr((struct sockaddr_in6 *)(void *)&sa); 746 switch (sa.ss_family) { 747 case AF_INET6: 748 sin6 = (struct sockaddr_in6 *)(void *)&sa; 749 if (e == FTP_EPASSIVE_MODE) 750 sin6->sin6_port = htons(port); 751 else { 752 bcopy(addr + 2, (char *)(void *)&sin6->sin6_addr, 16); 753 bcopy(addr + 19, (char *)(void *)&sin6->sin6_port, 2); 754 } 755 break; 756 case AF_INET: 757 sin4 = (struct sockaddr_in *)(void *)&sa; 758 if (e == FTP_EPASSIVE_MODE) 759 sin4->sin_port = htons(port); 760 else { 761 bcopy(addr, (char *)(void *)&sin4->sin_addr, 4); 762 bcopy(addr + 4, (char *)(void *)&sin4->sin_port, 2); 763 } 764 break; 765 default: 766 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 767 break; 768 } 769 770 /* connect to data port */ 771 if (verbose) 772 _fetch_info("opening data connection"); 773 bindaddr = getenv("FETCH_BIND_ADDRESS"); 774 if (bindaddr != NULL && *bindaddr != '\0' && 775 _fetch_bind(sd, sa.ss_family, bindaddr) != 0) 776 goto sysouch; 777 if (connect(sd, (struct sockaddr *)(void *)&sa, (unsigned)sa.ss_len) == -1) 778 goto sysouch; 779 780 /* make the server initiate the transfer */ 781 if (verbose) 782 _fetch_info("initiating transfer"); 783 e = _ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 784 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 785 goto ouch; 786 787 } else { 788 u_int32_t a; 789 u_short p; 790 int arg, d; 791 char *ap; 792 char hname[INET6_ADDRSTRLEN]; 793 794 switch (sa.ss_family) { 795 case AF_INET6: 796 ((struct sockaddr_in6 *)(void *)&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 *)(void *)&arg, sizeof(arg)) == -1) 801 goto sysouch; 802 #endif 803 break; 804 case AF_INET: 805 ((struct sockaddr_in *)(void *)&sa)->sin_port = 0; 806 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 807 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 808 (char *)(void *)&arg, sizeof(arg)) == -1) 809 goto sysouch; 810 break; 811 } 812 if (verbose) 813 _fetch_info("binding data socket"); 814 if (bind(sd, (struct sockaddr *)(void *)&sa, (unsigned) sa.ss_len) == -1) 815 goto sysouch; 816 if (listen(sd, 1) == -1) 817 goto sysouch; 818 819 /* find what port we're on and tell the server */ 820 if (getsockname(sd, (struct sockaddr *)(void *)&sa, &l) == -1) 821 goto sysouch; 822 switch (sa.ss_family) { 823 case AF_INET: 824 sin4 = (struct sockaddr_in *)(void *)&sa; 825 a = ntohl(sin4->sin_addr.s_addr); 826 p = ntohs(sin4->sin_port); 827 e = _ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 828 (a >> 24) & 0xff, (a >> 16) & 0xff, 829 (a >> 8) & 0xff, a & 0xff, 830 ((unsigned)p >> 8) & 0xff, p & 0xff); 831 break; 832 case AF_INET6: 833 #define UC(b) (((int)b)&0xff) 834 e = -1; 835 sin6 = (struct sockaddr_in6 *)(void *)&sa; 836 sin6->sin6_scope_id = 0; 837 if (getnameinfo((struct sockaddr *)(void *)&sa, 838 (unsigned)sa.ss_len, 839 hname, sizeof(hname), 840 NULL, 0, NI_NUMERICHOST) == 0) { 841 e = _ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 842 htons(sin6->sin6_port)); 843 if (e == -1) 844 goto ouch; 845 } 846 if (e != FTP_OK) { 847 ap = (char *)(void *)&sin6->sin6_addr; 848 e = _ftp_cmd(conn, 849 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 850 6, 16, 851 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 852 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 853 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 854 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 855 2, 856 ((unsigned)ntohs(sin6->sin6_port) >> 8) & 0xff, 857 ntohs(sin6->sin6_port) & 0xff); 858 } 859 break; 860 default: 861 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 862 goto ouch; 863 } 864 if (e != FTP_OK) 865 goto ouch; 866 867 /* seek to required offset */ 868 if (offset) 869 if (_ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) 870 goto sysouch; 871 872 /* make the server initiate the transfer */ 873 if (verbose) 874 _fetch_info("initiating transfer"); 875 e = _ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 876 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 877 goto ouch; 878 879 /* accept the incoming connection and go to town */ 880 if ((d = accept(sd, NULL, NULL)) == -1) 881 goto sysouch; 882 close(sd); 883 sd = d; 884 } 885 886 if ((df = _ftp_setup(conn, _fetch_reopen(sd), mode)) == NULL) 887 goto sysouch; 888 return (df); 889 890 sysouch: 891 _fetch_syserr(); 892 if (sd >= 0) 893 close(sd); 894 return (NULL); 895 896 ouch: 897 if (e != -1) 898 _ftp_seterr(e); 899 if (sd >= 0) 900 close(sd); 901 return (NULL); 902 } 903 904 /* 905 * Authenticate 906 */ 907 static int 908 _ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 909 { 910 const char *user, *pwd, *logname; 911 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 912 int e, len; 913 914 /* XXX FTP_AUTH, and maybe .netrc */ 915 916 /* send user name and password */ 917 if (url->user[0] == '\0') 918 _fetch_netrc_auth(url); 919 user = url->user; 920 if (*user == '\0') 921 user = getenv("FTP_LOGIN"); 922 if (user == NULL || *user == '\0') 923 user = FTP_ANONYMOUS_USER; 924 if (purl && url->port == _fetch_default_port(url->scheme)) 925 e = _ftp_cmd(conn, "USER %s@%s", user, url->host); 926 else if (purl) 927 e = _ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 928 else 929 e = _ftp_cmd(conn, "USER %s", user); 930 931 /* did the server request a password? */ 932 if (e == FTP_NEED_PASSWORD) { 933 pwd = url->pwd; 934 if (*pwd == '\0') 935 pwd = getenv("FTP_PASSWORD"); 936 if (pwd == NULL || *pwd == '\0') { 937 if ((logname = getlogin()) == 0) 938 logname = FTP_ANONYMOUS_USER; 939 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 940 len = 0; 941 else if (len > MAXLOGNAME) 942 len = MAXLOGNAME; 943 gethostname(pbuf + len, sizeof(pbuf) - len); 944 pwd = pbuf; 945 } 946 e = _ftp_cmd(conn, "PASS %s", pwd); 947 } 948 949 return (e); 950 } 951 952 /* 953 * Log on to FTP server 954 */ 955 static conn_t * 956 _ftp_connect(struct url *url, struct url *purl, const char *flags) 957 { 958 conn_t *conn; 959 int e, direct, verbose; 960 #ifdef INET6 961 int af = AF_UNSPEC; 962 #else 963 int af = AF_INET; 964 #endif 965 966 direct = CHECK_FLAG('d'); 967 verbose = CHECK_FLAG('v'); 968 if (CHECK_FLAG('4')) 969 af = AF_INET; 970 else if (CHECK_FLAG('6')) 971 af = AF_INET6; 972 973 if (direct) 974 purl = NULL; 975 976 /* check for proxy */ 977 if (purl) { 978 /* XXX proxy authentication! */ 979 conn = _fetch_connect(purl->host, purl->port, af, verbose); 980 } else { 981 /* no proxy, go straight to target */ 982 conn = _fetch_connect(url->host, url->port, af, verbose); 983 purl = NULL; 984 } 985 986 /* check connection */ 987 if (conn == NULL) 988 /* _fetch_connect() has already set an error code */ 989 return (NULL); 990 991 /* expect welcome message */ 992 if ((e = _ftp_chkerr(conn)) != FTP_SERVICE_READY) 993 goto fouch; 994 995 /* authenticate */ 996 if ((e = _ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 997 goto fouch; 998 999 /* TODO: Request extended features supported, if any (RFC 3659). */ 1000 1001 /* done */ 1002 return (conn); 1003 1004 fouch: 1005 if (e != -1) 1006 _ftp_seterr(e); 1007 _fetch_close(conn); 1008 return (NULL); 1009 } 1010 1011 /* 1012 * Disconnect from server 1013 */ 1014 static void 1015 _ftp_disconnect(conn_t *conn) 1016 { 1017 (void)_ftp_cmd(conn, "QUIT"); 1018 if (conn == cached_connection && conn->ref == 1) 1019 cached_connection = NULL; 1020 _fetch_close(conn); 1021 } 1022 1023 /* 1024 * Check if we're already connected 1025 */ 1026 static int 1027 _ftp_isconnected(struct url *url) 1028 { 1029 return (cached_connection 1030 && (strcmp(url->host, cached_host.host) == 0) 1031 && (strcmp(url->user, cached_host.user) == 0) 1032 && (strcmp(url->pwd, cached_host.pwd) == 0) 1033 && (url->port == cached_host.port)); 1034 } 1035 1036 /* 1037 * Check the cache, reconnect if no luck 1038 */ 1039 static conn_t * 1040 _ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1041 { 1042 conn_t *conn; 1043 int e; 1044 1045 /* set default port */ 1046 if (!url->port) 1047 url->port = _fetch_default_port(url->scheme); 1048 1049 /* try to use previously cached connection */ 1050 if (_ftp_isconnected(url)) { 1051 e = _ftp_cmd(cached_connection, "NOOP"); 1052 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1053 return (_fetch_ref(cached_connection)); 1054 } 1055 1056 /* connect to server */ 1057 if ((conn = _ftp_connect(url, purl, flags)) == NULL) 1058 return (NULL); 1059 if (cached_connection) 1060 _ftp_disconnect(cached_connection); 1061 cached_connection = _fetch_ref(conn); 1062 memcpy(&cached_host, url, sizeof(*url)); 1063 return (conn); 1064 } 1065 1066 /* 1067 * Check the proxy settings 1068 */ 1069 static struct url * 1070 _ftp_get_proxy(const char *flags) 1071 { 1072 struct url *purl; 1073 char *p; 1074 1075 if (flags != NULL && strchr(flags, 'd') != NULL) 1076 return (NULL); 1077 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1078 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1079 *p && (purl = fetchParseURL(p)) != NULL) { 1080 if (!*purl->scheme) { 1081 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1082 strcpy(purl->scheme, SCHEME_FTP); 1083 else 1084 strcpy(purl->scheme, SCHEME_HTTP); 1085 } 1086 if (!purl->port) 1087 purl->port = _fetch_default_proxy_port(purl->scheme); 1088 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1089 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1090 return (purl); 1091 fetchFreeURL(purl); 1092 } 1093 return (NULL); 1094 } 1095 1096 /* 1097 * Process an FTP request 1098 */ 1099 FILE * 1100 _ftp_request(struct url *url, const char *op, struct url_stat *us, 1101 struct url *purl, const char *flags) 1102 { 1103 conn_t *conn; 1104 int oflag; 1105 1106 /* check if we should use HTTP instead */ 1107 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1108 if (strcmp(op, "STAT") == 0) 1109 return (_http_request(url, "HEAD", us, purl, flags)); 1110 else if (strcmp(op, "RETR") == 0) 1111 return (_http_request(url, "GET", us, purl, flags)); 1112 /* 1113 * Our HTTP code doesn't support PUT requests yet, so try 1114 * a direct connection. 1115 */ 1116 } 1117 1118 /* connect to server */ 1119 conn = _ftp_cached_connect(url, purl, flags); 1120 if (purl) 1121 fetchFreeURL(purl); 1122 if (conn == NULL) 1123 return (NULL); 1124 1125 /* change directory */ 1126 if (_ftp_cwd(conn, url->doc) == -1) 1127 return (NULL); 1128 1129 /* stat file */ 1130 if (us && _ftp_stat(conn, url->doc, us) == -1 1131 && fetchLastErrCode != FETCH_PROTO 1132 && fetchLastErrCode != FETCH_UNAVAIL) 1133 return (NULL); 1134 1135 /* just a stat */ 1136 if (strcmp(op, "STAT") == 0) 1137 return (FILE *)1; /* bogus return value */ 1138 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1139 oflag = O_WRONLY; 1140 else 1141 oflag = O_RDONLY; 1142 1143 /* initiate the transfer */ 1144 return (_ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); 1145 } 1146 1147 /* 1148 * Get and stat file 1149 */ 1150 FILE * 1151 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1152 { 1153 return (_ftp_request(url, "RETR", us, _ftp_get_proxy(flags), flags)); 1154 } 1155 1156 /* 1157 * Get file 1158 */ 1159 FILE * 1160 fetchGetFTP(struct url *url, const char *flags) 1161 { 1162 return (fetchXGetFTP(url, NULL, flags)); 1163 } 1164 1165 /* 1166 * Put file 1167 */ 1168 FILE * 1169 fetchPutFTP(struct url *url, const char *flags) 1170 { 1171 1172 return (_ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 1173 _ftp_get_proxy(flags), flags)); 1174 } 1175 1176 /* 1177 * Get file stats 1178 */ 1179 int 1180 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1181 { 1182 FILE *f; 1183 1184 f = _ftp_request(url, "STAT", us, _ftp_get_proxy(flags), flags); 1185 if (f == NULL) 1186 return (-1); 1187 return (0); 1188 } 1189 1190 /* 1191 * List a directory 1192 */ 1193 /* ARGSUSED0 */ 1194 struct url_ent * 1195 fetchListFTP(struct url *url __unused, const char *flags __unused) 1196 { 1197 warnx("fetchListFTP(): not implemented"); 1198 return (NULL); 1199 } 1200