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 * $FreeBSD: src/lib/libfetch/ftp.c,v 1.96 2007/04/22 22:33:29 njl Exp $ 29 * $DragonFly: src/lib/libfetch/ftp.c,v 1.4 2007/08/05 21:48:12 swildner Exp $ 30 */ 31 32 /* 33 * Portions of this code were taken from or based on ftpio.c: 34 * 35 * ---------------------------------------------------------------------------- 36 * "THE BEER-WARE LICENSE" (Revision 42): 37 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you 38 * can do whatever you want with this stuff. If we meet some day, and you think 39 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 40 * ---------------------------------------------------------------------------- 41 * 42 * Major Changelog: 43 * 44 * Dag-Erling Co�dan Sm�rgrav 45 * 9 Jun 1998 46 * 47 * Incorporated into libfetch 48 * 49 * Jordan K. Hubbard 50 * 17 Jan 1996 51 * 52 * Turned inside out. Now returns xfers as new file ids, not as a special 53 * `state' of FTP_t 54 * 55 * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $ 56 * 57 */ 58 59 #include <sys/param.h> 60 #include <sys/socket.h> 61 #include <netinet/in.h> 62 63 #include <ctype.h> 64 #include <err.h> 65 #include <errno.h> 66 #include <fcntl.h> 67 #include <netdb.h> 68 #include <stdarg.h> 69 #include <stdint.h> 70 #include <stdio.h> 71 #include <stdlib.h> 72 #include <string.h> 73 #include <time.h> 74 #include <unistd.h> 75 76 #include "fetch.h" 77 #include "common.h" 78 #include "ftperr.h" 79 80 #define FTP_ANONYMOUS_USER "anonymous" 81 82 #define FTP_CONNECTION_ALREADY_OPEN 125 83 #define FTP_OPEN_DATA_CONNECTION 150 84 #define FTP_OK 200 85 #define FTP_FILE_STATUS 213 86 #define FTP_SERVICE_READY 220 87 #define FTP_TRANSFER_COMPLETE 226 88 #define FTP_PASSIVE_MODE 227 89 #define FTP_LPASSIVE_MODE 228 90 #define FTP_EPASSIVE_MODE 229 91 #define FTP_LOGGED_IN 230 92 #define FTP_FILE_ACTION_OK 250 93 #define FTP_DIRECTORY_CREATED 257 /* multiple meanings */ 94 #define FTP_FILE_CREATED 257 /* multiple meanings */ 95 #define FTP_WORKING_DIRECTORY 257 /* multiple meanings */ 96 #define FTP_NEED_PASSWORD 331 97 #define FTP_NEED_ACCOUNT 332 98 #define FTP_FILE_OK 350 99 #define FTP_SYNTAX_ERROR 500 100 #define FTP_PROTOCOL_ERROR 999 101 102 static struct url cached_host; 103 static conn_t *cached_connection; 104 105 #define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 106 && isdigit(foo[2]) \ 107 && (foo[3] == ' ' || foo[3] == '\0')) 108 #define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 109 && isdigit(foo[2]) && foo[3] == '-') 110 111 /* 112 * Translate IPv4 mapped IPv6 address to IPv4 address 113 */ 114 static void 115 unmappedaddr(struct sockaddr_in6 *sin6) 116 { 117 struct sockaddr_in *sin4; 118 u_int32_t addr; 119 int port; 120 121 if (sin6->sin6_family != AF_INET6 || 122 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 123 return; 124 sin4 = (struct sockaddr_in *)sin6; 125 addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12]; 126 port = sin6->sin6_port; 127 memset(sin4, 0, sizeof(struct sockaddr_in)); 128 sin4->sin_addr.s_addr = addr; 129 sin4->sin_port = port; 130 sin4->sin_family = AF_INET; 131 sin4->sin_len = sizeof(struct sockaddr_in); 132 } 133 134 /* 135 * Get server response 136 */ 137 static int 138 _ftp_chkerr(conn_t *conn) 139 { 140 if (_fetch_getln(conn) == -1) { 141 _fetch_syserr(); 142 return (-1); 143 } 144 if (isftpinfo(conn->buf)) { 145 while (conn->buflen && !isftpreply(conn->buf)) { 146 if (_fetch_getln(conn) == -1) { 147 _fetch_syserr(); 148 return (-1); 149 } 150 } 151 } 152 153 while (conn->buflen && isspace(conn->buf[conn->buflen - 1])) 154 conn->buflen--; 155 conn->buf[conn->buflen] = '\0'; 156 157 if (!isftpreply(conn->buf)) { 158 _ftp_seterr(FTP_PROTOCOL_ERROR); 159 return (-1); 160 } 161 162 conn->err = (conn->buf[0] - '0') * 100 163 + (conn->buf[1] - '0') * 10 164 + (conn->buf[2] - '0'); 165 166 return (conn->err); 167 } 168 169 /* 170 * Send a command and check reply 171 */ 172 static int 173 _ftp_cmd(conn_t *conn, const char *fmt, ...) 174 { 175 va_list ap; 176 size_t len; 177 char *msg; 178 int r; 179 180 va_start(ap, fmt); 181 len = vasprintf(&msg, fmt, ap); 182 va_end(ap); 183 184 if (msg == NULL) { 185 errno = ENOMEM; 186 _fetch_syserr(); 187 return (-1); 188 } 189 190 r = _fetch_putln(conn, msg, len); 191 free(msg); 192 193 if (r == -1) { 194 _fetch_syserr(); 195 return (-1); 196 } 197 198 return (_ftp_chkerr(conn)); 199 } 200 201 /* 202 * Return a pointer to the filename part of a path 203 */ 204 static const char * 205 _ftp_filename(const char *file, int *len, int *type) 206 { 207 const char *s; 208 209 if ((s = strrchr(file, '/')) == NULL) 210 s = file; 211 else 212 s = s + 1; 213 *len = strlen(s); 214 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 215 *type = s[*len - 1]; 216 *len -= 7; 217 } else { 218 *type = '\0'; 219 } 220 return (s); 221 } 222 223 /* 224 * Get current working directory from the reply to a CWD, PWD or CDUP 225 * command. 226 */ 227 static int 228 _ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen) 229 { 230 char *src, *dst, *end; 231 int q; 232 233 if (conn->err != FTP_WORKING_DIRECTORY && 234 conn->err != FTP_FILE_ACTION_OK) 235 return (FTP_PROTOCOL_ERROR); 236 end = conn->buf + conn->buflen; 237 src = conn->buf + 4; 238 if (src >= end || *src++ != '"') 239 return (FTP_PROTOCOL_ERROR); 240 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { 241 if (!q && *src == '"') 242 q = 1; 243 else if (q && *src != '"') 244 break; 245 else if (q) 246 *dst++ = '"', q = 0; 247 else 248 *dst++ = *src; 249 } 250 if (!pwdlen) 251 return (FTP_PROTOCOL_ERROR); 252 *dst = '\0'; 253 #if 0 254 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); 255 #endif 256 return (FTP_OK); 257 } 258 259 /* 260 * Change working directory to the directory that contains the specified 261 * file. 262 */ 263 static int 264 _ftp_cwd(conn_t *conn, const char *file) 265 { 266 const char *beg, *end; 267 char pwd[PATH_MAX]; 268 int e, i, len; 269 270 /* If no slashes in name, no need to change dirs. */ 271 if ((end = strrchr(file, '/')) == NULL) 272 return (0); 273 if ((e = _ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 274 (e = _ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 275 _ftp_seterr(e); 276 return (-1); 277 } 278 for (;;) { 279 len = strlen(pwd); 280 281 /* Look for a common prefix between PWD and dir to fetch. */ 282 for (i = 0; i <= len && i <= end - file; ++i) 283 if (pwd[i] != file[i]) 284 break; 285 #if 0 286 DEBUG(fprintf(stderr, "have: [%.*s|%s]\n", i, pwd, pwd + i)); 287 DEBUG(fprintf(stderr, "want: [%.*s|%s]\n", i, file, file + i)); 288 #endif 289 /* Keep going up a dir until we have a matching prefix. */ 290 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) 291 break; 292 if ((e = _ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || 293 (e = _ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 294 (e = _ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 295 _ftp_seterr(e); 296 return (-1); 297 } 298 } 299 300 #ifdef FTP_COMBINE_CWDS 301 /* Skip leading slashes, even "////". */ 302 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) 303 /* nothing */ ; 304 305 /* If there is no trailing dir, we're already there. */ 306 if (beg >= end) 307 return (0); 308 309 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 310 e = _ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); 311 if (e == FTP_FILE_ACTION_OK) 312 return (0); 313 #endif /* FTP_COMBINE_CWDS */ 314 315 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 316 for (beg = file + i; beg < end; beg = file + i + 1) { 317 while (*beg == '/') 318 ++beg, ++i; 319 for (++i; file + i < end && file[i] != '/'; ++i) 320 /* nothing */ ; 321 e = _ftp_cmd(conn, "CWD %.*s", file + i - beg, beg); 322 if (e != FTP_FILE_ACTION_OK) { 323 _ftp_seterr(e); 324 return (-1); 325 } 326 } 327 return (0); 328 } 329 330 /* 331 * Set transfer mode and data type 332 */ 333 static int 334 _ftp_mode_type(conn_t *conn, int mode, int type) 335 { 336 int e; 337 338 switch (mode) { 339 case 0: 340 case 's': 341 mode = 'S'; 342 case 'S': 343 break; 344 default: 345 return (FTP_PROTOCOL_ERROR); 346 } 347 if ((e = _ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { 348 if (mode == 'S') { 349 /* 350 * Stream mode is supposed to be the default - so 351 * much so that some servers not only do not 352 * support any other mode, but do not support the 353 * MODE command at all. 354 * 355 * If "MODE S" fails, it is unlikely that we 356 * previously succeeded in setting a different 357 * mode. Therefore, we simply hope that the 358 * server is already in the correct mode, and 359 * silently ignore the failure. 360 */ 361 } else { 362 return (e); 363 } 364 } 365 366 switch (type) { 367 case 0: 368 case 'i': 369 type = 'I'; 370 case 'I': 371 break; 372 case 'a': 373 type = 'A'; 374 case 'A': 375 break; 376 case 'd': 377 type = 'D'; 378 case 'D': 379 /* can't handle yet */ 380 default: 381 return (FTP_PROTOCOL_ERROR); 382 } 383 if ((e = _ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) 384 return (e); 385 386 return (FTP_OK); 387 } 388 389 /* 390 * Request and parse file stats 391 */ 392 static int 393 _ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 394 { 395 char *ln; 396 const char *filename; 397 int filenamelen, type; 398 struct tm tm; 399 time_t t; 400 int e; 401 402 us->size = -1; 403 us->atime = us->mtime = 0; 404 405 filename = _ftp_filename(file, &filenamelen, &type); 406 407 if ((e = _ftp_mode_type(conn, 0, type)) != FTP_OK) { 408 _ftp_seterr(e); 409 return (-1); 410 } 411 412 e = _ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); 413 if (e != FTP_FILE_STATUS) { 414 _ftp_seterr(e); 415 return (-1); 416 } 417 for (ln = conn->buf + 4; *ln && isspace(*ln); ln++) 418 /* nothing */ ; 419 for (us->size = 0; *ln && isdigit(*ln); ln++) 420 us->size = us->size * 10 + *ln - '0'; 421 if (*ln && !isspace(*ln)) { 422 _ftp_seterr(FTP_PROTOCOL_ERROR); 423 us->size = -1; 424 return (-1); 425 } 426 if (us->size == 0) 427 us->size = -1; 428 DEBUG(fprintf(stderr, "size: [%lld]\n", (long long)us->size)); 429 430 e = _ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); 431 if (e != FTP_FILE_STATUS) { 432 _ftp_seterr(e); 433 return (-1); 434 } 435 for (ln = conn->buf + 4; *ln && isspace(*ln); ln++) 436 /* nothing */ ; 437 switch (strspn(ln, "0123456789")) { 438 case 14: 439 break; 440 case 15: 441 ln++; 442 ln[0] = '2'; 443 ln[1] = '0'; 444 break; 445 default: 446 _ftp_seterr(FTP_PROTOCOL_ERROR); 447 return (-1); 448 } 449 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 450 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 451 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 452 _ftp_seterr(FTP_PROTOCOL_ERROR); 453 return (-1); 454 } 455 tm.tm_mon--; 456 tm.tm_year -= 1900; 457 tm.tm_isdst = -1; 458 t = timegm(&tm); 459 if (t == (time_t)-1) 460 t = time(NULL); 461 us->mtime = t; 462 us->atime = t; 463 DEBUG(fprintf(stderr, 464 "last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", 465 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 466 tm.tm_hour, tm.tm_min, tm.tm_sec)); 467 return (0); 468 } 469 470 /* 471 * I/O functions for FTP 472 */ 473 struct ftpio { 474 conn_t *cconn; /* Control connection */ 475 conn_t *dconn; /* Data connection */ 476 int dir; /* Direction */ 477 int eof; /* EOF reached */ 478 int err; /* Error code */ 479 }; 480 481 static int _ftp_readfn(void *, char *, int); 482 static int _ftp_writefn(void *, const char *, int); 483 static fpos_t _ftp_seekfn(void *, fpos_t, int); 484 static int _ftp_closefn(void *); 485 486 static int 487 _ftp_readfn(void *v, char *buf, int len) 488 { 489 struct ftpio *io; 490 int r; 491 492 io = (struct ftpio *)v; 493 if (io == NULL) { 494 errno = EBADF; 495 return (-1); 496 } 497 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 498 errno = EBADF; 499 return (-1); 500 } 501 if (io->err) { 502 errno = io->err; 503 return (-1); 504 } 505 if (io->eof) 506 return (0); 507 r = _fetch_read(io->dconn, buf, len); 508 if (r > 0) 509 return (r); 510 if (r == 0) { 511 io->eof = 1; 512 return (0); 513 } 514 if (errno != EINTR) 515 io->err = errno; 516 return (-1); 517 } 518 519 static int 520 _ftp_writefn(void *v, const char *buf, int len) 521 { 522 struct ftpio *io; 523 int w; 524 525 io = (struct ftpio *)v; 526 if (io == NULL) { 527 errno = EBADF; 528 return (-1); 529 } 530 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 531 errno = EBADF; 532 return (-1); 533 } 534 if (io->err) { 535 errno = io->err; 536 return (-1); 537 } 538 w = _fetch_write(io->dconn, buf, len); 539 if (w >= 0) 540 return (w); 541 if (errno != EINTR) 542 io->err = errno; 543 return (-1); 544 } 545 546 static fpos_t 547 _ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 548 { 549 struct ftpio *io; 550 551 io = (struct ftpio *)v; 552 if (io == NULL) { 553 errno = EBADF; 554 return (-1); 555 } 556 errno = ESPIPE; 557 return (-1); 558 } 559 560 static int 561 _ftp_closefn(void *v) 562 { 563 struct ftpio *io; 564 int r; 565 566 io = (struct ftpio *)v; 567 if (io == NULL) { 568 errno = EBADF; 569 return (-1); 570 } 571 if (io->dir == -1) 572 return (0); 573 if (io->cconn == NULL || io->dconn == NULL) { 574 errno = EBADF; 575 return (-1); 576 } 577 _fetch_close(io->dconn); 578 io->dir = -1; 579 io->dconn = NULL; 580 DEBUG(fprintf(stderr, "Waiting for final status\n")); 581 r = _ftp_chkerr(io->cconn); 582 if (io->cconn == cached_connection && io->cconn->ref == 1) 583 cached_connection = NULL; 584 _fetch_close(io->cconn); 585 free(io); 586 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 587 } 588 589 static FILE * 590 _ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 591 { 592 struct ftpio *io; 593 FILE *f; 594 595 if (cconn == NULL || dconn == NULL) 596 return (NULL); 597 if ((io = malloc(sizeof(*io))) == NULL) 598 return (NULL); 599 io->cconn = cconn; 600 io->dconn = dconn; 601 io->dir = mode; 602 io->eof = io->err = 0; 603 f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn); 604 if (f == NULL) 605 free(io); 606 return (f); 607 } 608 609 /* 610 * Transfer file 611 */ 612 static FILE * 613 _ftp_transfer(conn_t *conn, const char *oper, const char *file, 614 int mode, off_t offset, const char *flags) 615 { 616 struct sockaddr_storage sa; 617 struct sockaddr_in6 *sin6; 618 struct sockaddr_in *sin4; 619 const char *bindaddr; 620 const char *filename; 621 int filenamelen, type; 622 int low, pasv, verbose; 623 int e, sd = -1; 624 socklen_t l; 625 char *s; 626 FILE *df; 627 628 /* check flags */ 629 low = CHECK_FLAG('l'); 630 pasv = CHECK_FLAG('p'); 631 verbose = CHECK_FLAG('v'); 632 633 /* passive mode */ 634 if (!pasv) 635 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 636 strncasecmp(s, "no", 2) != 0); 637 638 /* isolate filename */ 639 filename = _ftp_filename(file, &filenamelen, &type); 640 641 /* set transfer mode and data type */ 642 if ((e = _ftp_mode_type(conn, 0, type)) != FTP_OK) 643 goto ouch; 644 645 /* find our own address, bind, and listen */ 646 l = sizeof(sa); 647 if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1) 648 goto sysouch; 649 if (sa.ss_family == AF_INET6) 650 unmappedaddr((struct sockaddr_in6 *)&sa); 651 652 /* open data socket */ 653 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 654 _fetch_syserr(); 655 return (NULL); 656 } 657 658 if (pasv) { 659 u_char addr[64]; 660 char *ln, *p; 661 unsigned int i; 662 int port; 663 664 /* send PASV command */ 665 if (verbose) 666 _fetch_info("setting passive mode"); 667 switch (sa.ss_family) { 668 case AF_INET: 669 if ((e = _ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 670 goto ouch; 671 break; 672 case AF_INET6: 673 if ((e = _ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 674 if (e == -1) 675 goto ouch; 676 if ((e = _ftp_cmd(conn, "LPSV")) != 677 FTP_LPASSIVE_MODE) 678 goto ouch; 679 } 680 break; 681 default: 682 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 683 goto ouch; 684 } 685 686 /* 687 * Find address and port number. The reply to the PASV command 688 * is IMHO the one and only weak point in the FTP protocol. 689 */ 690 ln = conn->buf; 691 switch (e) { 692 case FTP_PASSIVE_MODE: 693 case FTP_LPASSIVE_MODE: 694 for (p = ln + 3; *p && !isdigit(*p); p++) 695 /* nothing */ ; 696 if (!*p) { 697 e = FTP_PROTOCOL_ERROR; 698 goto ouch; 699 } 700 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 701 for (i = 0; *p && i < l; i++, p++) 702 addr[i] = strtol(p, &p, 10); 703 if (i < l) { 704 e = FTP_PROTOCOL_ERROR; 705 goto ouch; 706 } 707 break; 708 case FTP_EPASSIVE_MODE: 709 for (p = ln + 3; *p && *p != '('; p++) 710 /* nothing */ ; 711 if (!*p) { 712 e = FTP_PROTOCOL_ERROR; 713 goto ouch; 714 } 715 ++p; 716 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 717 &port, &addr[3]) != 5 || 718 addr[0] != addr[1] || 719 addr[0] != addr[2] || addr[0] != addr[3]) { 720 e = FTP_PROTOCOL_ERROR; 721 goto ouch; 722 } 723 break; 724 } 725 726 /* seek to required offset */ 727 if (offset) 728 if (_ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) 729 goto sysouch; 730 731 /* construct sockaddr for data socket */ 732 l = sizeof(sa); 733 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 734 goto sysouch; 735 if (sa.ss_family == AF_INET6) 736 unmappedaddr((struct sockaddr_in6 *)&sa); 737 switch (sa.ss_family) { 738 case AF_INET6: 739 sin6 = (struct sockaddr_in6 *)&sa; 740 if (e == FTP_EPASSIVE_MODE) 741 sin6->sin6_port = htons(port); 742 else { 743 bcopy(addr + 2, (char *)&sin6->sin6_addr, 16); 744 bcopy(addr + 19, (char *)&sin6->sin6_port, 2); 745 } 746 break; 747 case AF_INET: 748 sin4 = (struct sockaddr_in *)&sa; 749 if (e == FTP_EPASSIVE_MODE) 750 sin4->sin_port = htons(port); 751 else { 752 bcopy(addr, (char *)&sin4->sin_addr, 4); 753 bcopy(addr + 4, (char *)&sin4->sin_port, 2); 754 } 755 break; 756 default: 757 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 758 break; 759 } 760 761 /* connect to data port */ 762 if (verbose) 763 _fetch_info("opening data connection"); 764 bindaddr = getenv("FETCH_BIND_ADDRESS"); 765 if (bindaddr != NULL && *bindaddr != '\0' && 766 _fetch_bind(sd, sa.ss_family, bindaddr) != 0) 767 goto sysouch; 768 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 769 goto sysouch; 770 771 /* make the server initiate the transfer */ 772 if (verbose) 773 _fetch_info("initiating transfer"); 774 e = _ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 775 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 776 goto ouch; 777 778 } else { 779 u_int32_t a; 780 u_short p; 781 int arg, d; 782 char *ap; 783 char hname[INET6_ADDRSTRLEN]; 784 785 switch (sa.ss_family) { 786 case AF_INET6: 787 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 788 #ifdef IPV6_PORTRANGE 789 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 790 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 791 (char *)&arg, sizeof(arg)) == -1) 792 goto sysouch; 793 #endif 794 break; 795 case AF_INET: 796 ((struct sockaddr_in *)&sa)->sin_port = 0; 797 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 798 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 799 (char *)&arg, sizeof(arg)) == -1) 800 goto sysouch; 801 break; 802 } 803 if (verbose) 804 _fetch_info("binding data socket"); 805 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 806 goto sysouch; 807 if (listen(sd, 1) == -1) 808 goto sysouch; 809 810 /* find what port we're on and tell the server */ 811 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 812 goto sysouch; 813 switch (sa.ss_family) { 814 case AF_INET: 815 sin4 = (struct sockaddr_in *)&sa; 816 a = ntohl(sin4->sin_addr.s_addr); 817 p = ntohs(sin4->sin_port); 818 e = _ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 819 (a >> 24) & 0xff, (a >> 16) & 0xff, 820 (a >> 8) & 0xff, a & 0xff, 821 (p >> 8) & 0xff, p & 0xff); 822 break; 823 case AF_INET6: 824 #define UC(b) (((int)b)&0xff) 825 e = -1; 826 sin6 = (struct sockaddr_in6 *)&sa; 827 sin6->sin6_scope_id = 0; 828 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 829 hname, sizeof(hname), 830 NULL, 0, NI_NUMERICHOST) == 0) { 831 e = _ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 832 htons(sin6->sin6_port)); 833 if (e == -1) 834 goto ouch; 835 } 836 if (e != FTP_OK) { 837 ap = (char *)&sin6->sin6_addr; 838 e = _ftp_cmd(conn, 839 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 840 6, 16, 841 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 842 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 843 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 844 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 845 2, 846 (ntohs(sin6->sin6_port) >> 8) & 0xff, 847 ntohs(sin6->sin6_port) & 0xff); 848 } 849 break; 850 default: 851 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 852 goto ouch; 853 } 854 if (e != FTP_OK) 855 goto ouch; 856 857 /* seek to required offset */ 858 if (offset) 859 if (_ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) 860 goto sysouch; 861 862 /* make the server initiate the transfer */ 863 if (verbose) 864 _fetch_info("initiating transfer"); 865 e = _ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 866 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 867 goto ouch; 868 869 /* accept the incoming connection and go to town */ 870 if ((d = accept(sd, NULL, NULL)) == -1) 871 goto sysouch; 872 close(sd); 873 sd = d; 874 } 875 876 if ((df = _ftp_setup(conn, _fetch_reopen(sd), mode)) == NULL) 877 goto sysouch; 878 return (df); 879 880 sysouch: 881 _fetch_syserr(); 882 if (sd >= 0) 883 close(sd); 884 return (NULL); 885 886 ouch: 887 if (e != -1) 888 _ftp_seterr(e); 889 if (sd >= 0) 890 close(sd); 891 return (NULL); 892 } 893 894 /* 895 * Authenticate 896 */ 897 static int 898 _ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 899 { 900 const char *user, *pwd, *logname; 901 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 902 int e, len; 903 904 /* XXX FTP_AUTH, and maybe .netrc */ 905 906 /* send user name and password */ 907 if (url->user[0] == '\0') 908 _fetch_netrc_auth(url); 909 user = url->user; 910 if (*user == '\0') 911 user = getenv("FTP_LOGIN"); 912 if (user == NULL || *user == '\0') 913 user = FTP_ANONYMOUS_USER; 914 if (purl && url->port == _fetch_default_port(url->scheme)) 915 e = _ftp_cmd(conn, "USER %s@%s", user, url->host); 916 else if (purl) 917 e = _ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 918 else 919 e = _ftp_cmd(conn, "USER %s", user); 920 921 /* did the server request a password? */ 922 if (e == FTP_NEED_PASSWORD) { 923 pwd = url->pwd; 924 if (*pwd == '\0') 925 pwd = getenv("FTP_PASSWORD"); 926 if (pwd == NULL || *pwd == '\0') { 927 if ((logname = getlogin()) == 0) 928 logname = FTP_ANONYMOUS_USER; 929 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 930 len = 0; 931 else if (len > MAXLOGNAME) 932 len = MAXLOGNAME; 933 gethostname(pbuf + len, sizeof(pbuf) - len); 934 pwd = pbuf; 935 } 936 e = _ftp_cmd(conn, "PASS %s", pwd); 937 } 938 939 return (e); 940 } 941 942 /* 943 * Log on to FTP server 944 */ 945 static conn_t * 946 _ftp_connect(struct url *url, struct url *purl, const char *flags) 947 { 948 conn_t *conn; 949 int e, direct, verbose; 950 #ifdef INET6 951 int af = AF_UNSPEC; 952 #else 953 int af = AF_INET; 954 #endif 955 956 direct = CHECK_FLAG('d'); 957 verbose = CHECK_FLAG('v'); 958 if (CHECK_FLAG('4')) 959 af = AF_INET; 960 else if (CHECK_FLAG('6')) 961 af = AF_INET6; 962 963 if (direct) 964 purl = NULL; 965 966 /* check for proxy */ 967 if (purl) { 968 /* XXX proxy authentication! */ 969 conn = _fetch_connect(purl->host, purl->port, af, verbose); 970 } else { 971 /* no proxy, go straight to target */ 972 conn = _fetch_connect(url->host, url->port, af, verbose); 973 purl = NULL; 974 } 975 976 /* check connection */ 977 if (conn == NULL) 978 /* _fetch_connect() has already set an error code */ 979 return (NULL); 980 981 /* expect welcome message */ 982 if ((e = _ftp_chkerr(conn)) != FTP_SERVICE_READY) 983 goto fouch; 984 985 /* authenticate */ 986 if ((e = _ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 987 goto fouch; 988 989 /* TODO: Request extended features supported, if any (RFC 3659). */ 990 991 /* done */ 992 return (conn); 993 994 fouch: 995 if (e != -1) 996 _ftp_seterr(e); 997 _fetch_close(conn); 998 return (NULL); 999 } 1000 1001 /* 1002 * Disconnect from server 1003 */ 1004 static void 1005 _ftp_disconnect(conn_t *conn) 1006 { 1007 (void)_ftp_cmd(conn, "QUIT"); 1008 if (conn == cached_connection && conn->ref == 1) 1009 cached_connection = NULL; 1010 _fetch_close(conn); 1011 } 1012 1013 /* 1014 * Check if we're already connected 1015 */ 1016 static int 1017 _ftp_isconnected(struct url *url) 1018 { 1019 return (cached_connection 1020 && (strcmp(url->host, cached_host.host) == 0) 1021 && (strcmp(url->user, cached_host.user) == 0) 1022 && (strcmp(url->pwd, cached_host.pwd) == 0) 1023 && (url->port == cached_host.port)); 1024 } 1025 1026 /* 1027 * Check the cache, reconnect if no luck 1028 */ 1029 static conn_t * 1030 _ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1031 { 1032 conn_t *conn; 1033 int e; 1034 1035 /* set default port */ 1036 if (!url->port) 1037 url->port = _fetch_default_port(url->scheme); 1038 1039 /* try to use previously cached connection */ 1040 if (_ftp_isconnected(url)) { 1041 e = _ftp_cmd(cached_connection, "NOOP"); 1042 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1043 return (_fetch_ref(cached_connection)); 1044 } 1045 1046 /* connect to server */ 1047 if ((conn = _ftp_connect(url, purl, flags)) == NULL) 1048 return (NULL); 1049 if (cached_connection) 1050 _ftp_disconnect(cached_connection); 1051 cached_connection = _fetch_ref(conn); 1052 memcpy(&cached_host, url, sizeof(*url)); 1053 return (conn); 1054 } 1055 1056 /* 1057 * Check the proxy settings 1058 */ 1059 static struct url * 1060 _ftp_get_proxy(const char *flags) 1061 { 1062 struct url *purl; 1063 char *p; 1064 1065 if (flags != NULL && strchr(flags, 'd') != NULL) 1066 return (NULL); 1067 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1068 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1069 *p && (purl = fetchParseURL(p)) != NULL) { 1070 if (!*purl->scheme) { 1071 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1072 strcpy(purl->scheme, SCHEME_FTP); 1073 else 1074 strcpy(purl->scheme, SCHEME_HTTP); 1075 } 1076 if (!purl->port) 1077 purl->port = _fetch_default_proxy_port(purl->scheme); 1078 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1079 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1080 return (purl); 1081 fetchFreeURL(purl); 1082 } 1083 return (NULL); 1084 } 1085 1086 /* 1087 * Process an FTP request 1088 */ 1089 FILE * 1090 _ftp_request(struct url *url, const char *op, struct url_stat *us, 1091 struct url *purl, const char *flags) 1092 { 1093 conn_t *conn; 1094 int oflag; 1095 1096 /* check if we should use HTTP instead */ 1097 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1098 if (strcmp(op, "STAT") == 0) 1099 return (_http_request(url, "HEAD", us, purl, flags)); 1100 else if (strcmp(op, "RETR") == 0) 1101 return (_http_request(url, "GET", us, purl, flags)); 1102 /* 1103 * Our HTTP code doesn't support PUT requests yet, so try 1104 * a direct connection. 1105 */ 1106 } 1107 1108 /* connect to server */ 1109 conn = _ftp_cached_connect(url, purl, flags); 1110 if (purl) 1111 fetchFreeURL(purl); 1112 if (conn == NULL) 1113 return (NULL); 1114 1115 /* change directory */ 1116 if (_ftp_cwd(conn, url->doc) == -1) 1117 return (NULL); 1118 1119 /* stat file */ 1120 if (us && _ftp_stat(conn, url->doc, us) == -1 1121 && fetchLastErrCode != FETCH_PROTO 1122 && fetchLastErrCode != FETCH_UNAVAIL) 1123 return (NULL); 1124 1125 /* just a stat */ 1126 if (strcmp(op, "STAT") == 0) 1127 return (FILE *)1; /* bogus return value */ 1128 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1129 oflag = O_WRONLY; 1130 else 1131 oflag = O_RDONLY; 1132 1133 /* initiate the transfer */ 1134 return (_ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); 1135 } 1136 1137 /* 1138 * Get and stat file 1139 */ 1140 FILE * 1141 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1142 { 1143 return (_ftp_request(url, "RETR", us, _ftp_get_proxy(flags), flags)); 1144 } 1145 1146 /* 1147 * Get file 1148 */ 1149 FILE * 1150 fetchGetFTP(struct url *url, const char *flags) 1151 { 1152 return (fetchXGetFTP(url, NULL, flags)); 1153 } 1154 1155 /* 1156 * Put file 1157 */ 1158 FILE * 1159 fetchPutFTP(struct url *url, const char *flags) 1160 { 1161 1162 return (_ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 1163 _ftp_get_proxy(flags), flags)); 1164 } 1165 1166 /* 1167 * Get file stats 1168 */ 1169 int 1170 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1171 { 1172 FILE *f; 1173 1174 f = _ftp_request(url, "STAT", us, _ftp_get_proxy(flags), flags); 1175 if (f == NULL) 1176 return (-1); 1177 return (0); 1178 } 1179 1180 /* 1181 * List a directory 1182 */ 1183 struct url_ent * 1184 fetchListFTP(struct url *url __unused, const char *flags __unused) 1185 { 1186 warnx("fetchListFTP(): not implemented"); 1187 return (NULL); 1188 } 1189