1 /*- 2 * SPDX-License-Identifier: (BSD-3-Clause AND Beerware) 3 * 4 * Copyright (c) 1998-2011 Dag-Erling Smørgrav 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 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 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 Smørgrav 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) \ 108 (isdigit((unsigned char)foo[0]) && \ 109 isdigit((unsigned char)foo[1]) && \ 110 isdigit((unsigned char)foo[2]) && \ 111 (foo[3] == ' ' || foo[3] == '\0')) 112 #define isftpinfo(foo) \ 113 (isdigit((unsigned char)foo[0]) && \ 114 isdigit((unsigned char)foo[1]) && \ 115 isdigit((unsigned char)foo[2]) && \ 116 foo[3] == '-') 117 118 /* 119 * Translate IPv4 mapped IPv6 address to IPv4 address 120 */ 121 static void 122 unmappedaddr(struct sockaddr_in6 *sin6) 123 { 124 struct sockaddr_in *sin4; 125 u_int32_t addr; 126 int port; 127 128 if (sin6->sin6_family != AF_INET6 || 129 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 130 return; 131 sin4 = (struct sockaddr_in *)sin6; 132 addr = *(u_int32_t *)(uintptr_t)&sin6->sin6_addr.s6_addr[12]; 133 port = sin6->sin6_port; 134 memset(sin4, 0, sizeof(struct sockaddr_in)); 135 sin4->sin_addr.s_addr = addr; 136 sin4->sin_port = port; 137 sin4->sin_family = AF_INET; 138 sin4->sin_len = sizeof(struct sockaddr_in); 139 } 140 141 /* 142 * Get server response 143 */ 144 static int 145 ftp_chkerr(conn_t *conn) 146 { 147 if (fetch_getln(conn) == -1) { 148 fetch_syserr(); 149 return (-1); 150 } 151 if (isftpinfo(conn->buf)) { 152 while (conn->buflen && !isftpreply(conn->buf)) { 153 if (fetch_getln(conn) == -1) { 154 fetch_syserr(); 155 return (-1); 156 } 157 } 158 } 159 160 while (conn->buflen && 161 isspace((unsigned char)conn->buf[conn->buflen - 1])) 162 conn->buflen--; 163 conn->buf[conn->buflen] = '\0'; 164 165 if (!isftpreply(conn->buf)) { 166 ftp_seterr(FTP_PROTOCOL_ERROR); 167 return (-1); 168 } 169 170 conn->err = (conn->buf[0] - '0') * 100 171 + (conn->buf[1] - '0') * 10 172 + (conn->buf[2] - '0'); 173 174 return (conn->err); 175 } 176 177 /* 178 * Send a command and check reply 179 */ 180 static int 181 ftp_cmd(conn_t *conn, const char *fmt, ...) 182 { 183 va_list ap; 184 size_t len; 185 char *msg; 186 int r; 187 188 va_start(ap, fmt); 189 len = vasprintf(&msg, fmt, ap); 190 va_end(ap); 191 192 if (msg == NULL) { 193 errno = ENOMEM; 194 fetch_syserr(); 195 return (-1); 196 } 197 198 r = fetch_putln(conn, msg, len); 199 free(msg); 200 201 if (r == -1) { 202 fetch_syserr(); 203 return (-1); 204 } 205 206 return (ftp_chkerr(conn)); 207 } 208 209 /* 210 * Return a pointer to the filename part of a path 211 */ 212 static const char * 213 ftp_filename(const char *file, int *len, int *type) 214 { 215 const char *s; 216 217 if ((s = strrchr(file, '/')) == NULL) 218 s = file; 219 else 220 s = s + 1; 221 *len = strlen(s); 222 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 223 *type = s[*len - 1]; 224 *len -= 7; 225 } else { 226 *type = '\0'; 227 } 228 return (s); 229 } 230 231 /* 232 * Get current working directory from the reply to a CWD, PWD or CDUP 233 * command. 234 */ 235 static int 236 ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen) 237 { 238 char *src, *dst, *end; 239 int q; 240 241 if (conn->err != FTP_WORKING_DIRECTORY && 242 conn->err != FTP_FILE_ACTION_OK) 243 return (FTP_PROTOCOL_ERROR); 244 end = conn->buf + conn->buflen; 245 src = conn->buf + 4; 246 if (src >= end || *src++ != '"') 247 return (FTP_PROTOCOL_ERROR); 248 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { 249 if (!q && *src == '"') 250 q = 1; 251 else if (q && *src != '"') 252 break; 253 else if (q) 254 *dst++ = '"', q = 0; 255 else 256 *dst++ = *src; 257 } 258 if (!pwdlen) 259 return (FTP_PROTOCOL_ERROR); 260 *dst = '\0'; 261 #if 0 262 DEBUGF("pwd: [%s]\n", pwd); 263 #endif 264 return (FTP_OK); 265 } 266 267 /* 268 * Change working directory to the directory that contains the specified 269 * file. 270 */ 271 static int 272 ftp_cwd(conn_t *conn, const char *file) 273 { 274 const char *beg, *end; 275 char pwd[PATH_MAX]; 276 int e, i, len; 277 278 /* If no slashes in name, no need to change dirs. */ 279 if ((end = strrchr(file, '/')) == NULL) 280 return (0); 281 if ((e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 282 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 283 ftp_seterr(e); 284 return (-1); 285 } 286 for (;;) { 287 len = strlen(pwd); 288 289 /* Look for a common prefix between PWD and dir to fetch. */ 290 for (i = 0; i <= len && i <= end - file; ++i) 291 if (pwd[i] != file[i]) 292 break; 293 #if 0 294 DEBUGF("have: [%.*s|%s]\n", i, pwd, pwd + i); 295 DEBUGF("want: [%.*s|%s]\n", i, file, file + i); 296 #endif 297 /* Keep going up a dir until we have a matching prefix. */ 298 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) 299 break; 300 if ((e = ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || 301 (e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 302 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 303 ftp_seterr(e); 304 return (-1); 305 } 306 } 307 308 #ifdef FTP_COMBINE_CWDS 309 /* Skip leading slashes, even "////". */ 310 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) 311 /* nothing */ ; 312 313 /* If there is no trailing dir, we're already there. */ 314 if (beg >= end) 315 return (0); 316 317 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 318 e = ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); 319 if (e == FTP_FILE_ACTION_OK) 320 return (0); 321 #endif /* FTP_COMBINE_CWDS */ 322 323 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 324 for (beg = file + i; beg < end; beg = file + i + 1) { 325 while (*beg == '/') 326 ++beg, ++i; 327 for (++i; file + i < end && file[i] != '/'; ++i) 328 /* nothing */ ; 329 e = ftp_cmd(conn, "CWD %.*s", file + i - beg, beg); 330 if (e != FTP_FILE_ACTION_OK) { 331 ftp_seterr(e); 332 return (-1); 333 } 334 } 335 return (0); 336 } 337 338 /* 339 * Set transfer mode and data type 340 */ 341 static int 342 ftp_mode_type(conn_t *conn, int mode, int type) 343 { 344 int e; 345 346 switch (mode) { 347 case 0: 348 case 's': 349 mode = 'S'; 350 case 'S': 351 break; 352 default: 353 return (FTP_PROTOCOL_ERROR); 354 } 355 if ((e = ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { 356 if (mode == 'S') { 357 /* 358 * Stream mode is supposed to be the default - so 359 * much so that some servers not only do not 360 * support any other mode, but do not support the 361 * MODE command at all. 362 * 363 * If "MODE S" fails, it is unlikely that we 364 * previously succeeded in setting a different 365 * mode. Therefore, we simply hope that the 366 * server is already in the correct mode, and 367 * silently ignore the failure. 368 */ 369 } else { 370 return (e); 371 } 372 } 373 374 switch (type) { 375 case 0: 376 case 'i': 377 type = 'I'; 378 case 'I': 379 break; 380 case 'a': 381 type = 'A'; 382 case 'A': 383 break; 384 case 'd': 385 type = 'D'; 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 char)*ln); ln++) 426 /* nothing */ ; 427 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 428 us->size = us->size * 10 + *ln - '0'; 429 if (*ln && !isspace((unsigned char)*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 DEBUGF("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 char)*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 DEBUGF("last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", 472 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 473 tm.tm_hour, tm.tm_min, tm.tm_sec); 474 return (0); 475 } 476 477 /* 478 * I/O functions for FTP 479 */ 480 struct ftpio { 481 conn_t *cconn; /* Control connection */ 482 conn_t *dconn; /* Data connection */ 483 int dir; /* Direction */ 484 int eof; /* EOF reached */ 485 int err; /* Error code */ 486 }; 487 488 static int ftp_readfn(void *, char *, int); 489 static int ftp_writefn(void *, const char *, int); 490 static fpos_t ftp_seekfn(void *, fpos_t, int); 491 static int ftp_closefn(void *); 492 493 static int 494 ftp_readfn(void *v, char *buf, int len) 495 { 496 struct ftpio *io; 497 int r; 498 499 io = (struct ftpio *)v; 500 if (io == NULL) { 501 errno = EBADF; 502 return (-1); 503 } 504 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 505 errno = EBADF; 506 return (-1); 507 } 508 if (io->err) { 509 errno = io->err; 510 return (-1); 511 } 512 if (io->eof) 513 return (0); 514 r = fetch_read(io->dconn, buf, len); 515 if (r > 0) 516 return (r); 517 if (r == 0) { 518 io->eof = 1; 519 return (0); 520 } 521 if (errno != EINTR) 522 io->err = errno; 523 return (-1); 524 } 525 526 static int 527 ftp_writefn(void *v, const char *buf, int len) 528 { 529 struct ftpio *io; 530 int w; 531 532 io = (struct ftpio *)v; 533 if (io == NULL) { 534 errno = EBADF; 535 return (-1); 536 } 537 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 538 errno = EBADF; 539 return (-1); 540 } 541 if (io->err) { 542 errno = io->err; 543 return (-1); 544 } 545 w = fetch_write(io->dconn, buf, len); 546 if (w >= 0) 547 return (w); 548 if (errno != EINTR) 549 io->err = errno; 550 return (-1); 551 } 552 553 static fpos_t 554 ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 555 { 556 struct ftpio *io; 557 558 io = (struct ftpio *)v; 559 if (io == NULL) { 560 errno = EBADF; 561 return (-1); 562 } 563 errno = ESPIPE; 564 return (-1); 565 } 566 567 static int 568 ftp_closefn(void *v) 569 { 570 struct ftpio *io; 571 int r; 572 573 io = (struct ftpio *)v; 574 if (io == NULL) { 575 errno = EBADF; 576 return (-1); 577 } 578 if (io->dir == -1) 579 return (0); 580 if (io->cconn == NULL || io->dconn == NULL) { 581 errno = EBADF; 582 return (-1); 583 } 584 fetch_close(io->dconn); 585 io->dir = -1; 586 io->dconn = NULL; 587 DEBUGF("Waiting for final status\n"); 588 r = ftp_chkerr(io->cconn); 589 if (io->cconn == cached_connection && io->cconn->ref == 1) 590 cached_connection = NULL; 591 fetch_close(io->cconn); 592 free(io); 593 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 594 } 595 596 static FILE * 597 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 598 { 599 struct ftpio *io; 600 FILE *f; 601 602 if (cconn == NULL || dconn == NULL) 603 return (NULL); 604 if ((io = malloc(sizeof(*io))) == NULL) 605 return (NULL); 606 io->cconn = cconn; 607 io->dconn = dconn; 608 io->dir = mode; 609 io->eof = io->err = 0; 610 f = funopen(io, ftp_readfn, ftp_writefn, ftp_seekfn, ftp_closefn); 611 if (f == NULL) 612 free(io); 613 return (f); 614 } 615 616 /* 617 * Transfer file 618 */ 619 static FILE * 620 ftp_transfer(conn_t *conn, const char *oper, const char *file, 621 int mode, off_t offset, const char *flags) 622 { 623 struct sockaddr_storage sa; 624 struct sockaddr_in6 *sin6; 625 struct sockaddr_in *sin4; 626 const char *bindaddr; 627 const char *filename; 628 int filenamelen, type; 629 int low, pasv, verbose; 630 int e, sd = -1; 631 socklen_t l; 632 char *s; 633 FILE *df; 634 635 /* check flags */ 636 low = CHECK_FLAG('l'); 637 pasv = CHECK_FLAG('p') || !CHECK_FLAG('P'); 638 verbose = CHECK_FLAG('v'); 639 640 /* passive mode */ 641 if ((s = getenv("FTP_PASSIVE_MODE")) != NULL) 642 pasv = (strncasecmp(s, "no", 2) != 0); 643 644 /* isolate filename */ 645 filename = ftp_filename(file, &filenamelen, &type); 646 647 /* set transfer mode and data type */ 648 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 649 goto ouch; 650 651 /* find our own address, bind, and listen */ 652 l = sizeof(sa); 653 if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1) 654 goto sysouch; 655 if (sa.ss_family == AF_INET6) 656 unmappedaddr((struct sockaddr_in6 *)&sa); 657 658 /* open data socket */ 659 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 660 fetch_syserr(); 661 return (NULL); 662 } 663 664 if (pasv) { 665 u_char addr[64]; 666 char *ln, *p; 667 unsigned int i; 668 int port; 669 670 /* send PASV command */ 671 if (verbose) 672 fetch_info("setting passive mode"); 673 switch (sa.ss_family) { 674 case AF_INET: 675 if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 676 goto ouch; 677 break; 678 case AF_INET6: 679 if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 680 if (e == -1) 681 goto ouch; 682 if ((e = ftp_cmd(conn, "LPSV")) != 683 FTP_LPASSIVE_MODE) 684 goto ouch; 685 } 686 break; 687 default: 688 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 689 goto ouch; 690 } 691 692 /* 693 * Find address and port number. The reply to the PASV command 694 * is IMHO the one and only weak point in the FTP protocol. 695 */ 696 ln = conn->buf; 697 switch (e) { 698 case FTP_PASSIVE_MODE: 699 case FTP_LPASSIVE_MODE: 700 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 701 /* nothing */ ; 702 if (!*p) { 703 e = FTP_PROTOCOL_ERROR; 704 goto ouch; 705 } 706 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 707 for (i = 0; *p && i < l; i++, p++) 708 addr[i] = strtol(p, &p, 10); 709 if (i < l) { 710 e = FTP_PROTOCOL_ERROR; 711 goto ouch; 712 } 713 break; 714 case FTP_EPASSIVE_MODE: 715 for (p = ln + 3; *p && *p != '('; p++) 716 /* nothing */ ; 717 if (!*p) { 718 e = FTP_PROTOCOL_ERROR; 719 goto ouch; 720 } 721 ++p; 722 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 723 &port, &addr[3]) != 5 || 724 addr[0] != addr[1] || 725 addr[0] != addr[2] || addr[0] != addr[3]) { 726 e = FTP_PROTOCOL_ERROR; 727 goto ouch; 728 } 729 break; 730 } 731 732 /* seek to required offset */ 733 if (offset) 734 if (ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) 735 goto sysouch; 736 737 /* construct sockaddr for data socket */ 738 l = sizeof(sa); 739 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 740 goto sysouch; 741 if (sa.ss_family == AF_INET6) 742 unmappedaddr((struct sockaddr_in6 *)&sa); 743 switch (sa.ss_family) { 744 case AF_INET6: 745 sin6 = (struct sockaddr_in6 *)&sa; 746 if (e == FTP_EPASSIVE_MODE) 747 sin6->sin6_port = htons(port); 748 else { 749 memcpy(&sin6->sin6_addr, addr + 2, 16); 750 memcpy(&sin6->sin6_port, addr + 19, 2); 751 } 752 break; 753 case AF_INET: 754 sin4 = (struct sockaddr_in *)&sa; 755 if (e == FTP_EPASSIVE_MODE) 756 sin4->sin_port = htons(port); 757 else { 758 memcpy(&sin4->sin_addr, addr, 4); 759 memcpy(&sin4->sin_port, addr + 4, 2); 760 } 761 break; 762 default: 763 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 764 break; 765 } 766 767 /* connect to data port */ 768 if (verbose) 769 fetch_info("opening data connection"); 770 bindaddr = getenv("FETCH_BIND_ADDRESS"); 771 if (bindaddr != NULL && *bindaddr != '\0' && 772 (e = fetch_bind(sd, sa.ss_family, bindaddr)) != 0) 773 goto ouch; 774 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 775 goto sysouch; 776 777 /* make the server initiate the transfer */ 778 if (verbose) 779 fetch_info("initiating transfer"); 780 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 781 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 782 goto ouch; 783 784 } else { 785 u_int32_t a; 786 u_short p; 787 int arg, d; 788 char *ap; 789 char hname[INET6_ADDRSTRLEN]; 790 791 switch (sa.ss_family) { 792 case AF_INET6: 793 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 794 #ifdef IPV6_PORTRANGE 795 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 796 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 797 (char *)&arg, sizeof(arg)) == -1) 798 goto sysouch; 799 #endif 800 break; 801 case AF_INET: 802 ((struct sockaddr_in *)&sa)->sin_port = 0; 803 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 804 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 805 (char *)&arg, sizeof(arg)) == -1) 806 goto sysouch; 807 break; 808 } 809 if (verbose) 810 fetch_info("binding data socket"); 811 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 812 goto sysouch; 813 if (listen(sd, 1) == -1) 814 goto sysouch; 815 816 /* find what port we're on and tell the server */ 817 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 818 goto sysouch; 819 switch (sa.ss_family) { 820 case AF_INET: 821 sin4 = (struct sockaddr_in *)&sa; 822 a = ntohl(sin4->sin_addr.s_addr); 823 p = ntohs(sin4->sin_port); 824 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 825 (a >> 24) & 0xff, (a >> 16) & 0xff, 826 (a >> 8) & 0xff, a & 0xff, 827 (p >> 8) & 0xff, p & 0xff); 828 break; 829 case AF_INET6: 830 #define UC(b) (((int)b)&0xff) 831 e = -1; 832 sin6 = (struct sockaddr_in6 *)&sa; 833 sin6->sin6_scope_id = 0; 834 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 835 hname, sizeof(hname), 836 NULL, 0, NI_NUMERICHOST) == 0) { 837 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 838 htons(sin6->sin6_port)); 839 if (e == -1) 840 goto ouch; 841 } 842 if (e != FTP_OK) { 843 ap = (char *)&sin6->sin6_addr; 844 e = ftp_cmd(conn, 845 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 846 6, 16, 847 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 848 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 849 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 850 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 851 2, 852 (ntohs(sin6->sin6_port) >> 8) & 0xff, 853 ntohs(sin6->sin6_port) & 0xff); 854 } 855 break; 856 default: 857 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 858 goto ouch; 859 } 860 if (e != FTP_OK) 861 goto ouch; 862 863 /* seek to required offset */ 864 if (offset) 865 if (ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) 866 goto sysouch; 867 868 /* make the server initiate the transfer */ 869 if (verbose) 870 fetch_info("initiating transfer"); 871 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 872 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 873 goto ouch; 874 875 /* accept the incoming connection and go to town */ 876 if ((d = accept(sd, NULL, NULL)) == -1) 877 goto sysouch; 878 close(sd); 879 sd = d; 880 } 881 882 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 883 goto sysouch; 884 return (df); 885 886 sysouch: 887 fetch_syserr(); 888 if (sd >= 0) 889 close(sd); 890 return (NULL); 891 892 ouch: 893 if (e != -1) 894 ftp_seterr(e); 895 if (sd >= 0) 896 close(sd); 897 return (NULL); 898 } 899 900 /* 901 * Authenticate 902 */ 903 static int 904 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 905 { 906 const char *user, *pwd, *logname; 907 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 908 int e, len; 909 910 /* XXX FTP_AUTH, and maybe .netrc */ 911 912 /* send user name and password */ 913 if (url->user[0] == '\0') 914 fetch_netrc_auth(url); 915 user = url->user; 916 if (*user == '\0') 917 if ((user = getenv("FTP_LOGIN")) != NULL) 918 DEBUGF("FTP_LOGIN=%s\n", user); 919 if (user == NULL || *user == '\0') 920 user = FTP_ANONYMOUS_USER; 921 if (purl && url->port == fetch_default_port(url->scheme)) 922 e = ftp_cmd(conn, "USER %s@%s", user, url->host); 923 else if (purl) 924 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 925 else 926 e = ftp_cmd(conn, "USER %s", user); 927 928 /* did the server request a password? */ 929 if (e == FTP_NEED_PASSWORD) { 930 pwd = url->pwd; 931 if (*pwd == '\0') 932 if ((pwd = getenv("FTP_PASSWORD")) != NULL) 933 DEBUGF("FTP_PASSWORD=%s\n", pwd); 934 if (pwd == NULL || *pwd == '\0') { 935 if ((logname = getlogin()) == NULL) 936 logname = FTP_ANONYMOUS_USER; 937 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 938 len = 0; 939 else if (len > MAXLOGNAME) 940 len = MAXLOGNAME; 941 gethostname(pbuf + len, sizeof(pbuf) - len); 942 pwd = pbuf; 943 } 944 e = ftp_cmd(conn, "PASS %s", pwd); 945 } 946 947 return (e); 948 } 949 950 /* 951 * Log on to FTP server 952 */ 953 static conn_t * 954 ftp_connect(struct url *url, struct url *purl, const char *flags) 955 { 956 conn_t *conn; 957 int e, direct, verbose; 958 #ifdef INET6 959 int af = AF_UNSPEC; 960 #else 961 int af = AF_INET; 962 #endif 963 964 direct = CHECK_FLAG('d'); 965 verbose = CHECK_FLAG('v'); 966 if (CHECK_FLAG('4')) 967 af = AF_INET; 968 else if (CHECK_FLAG('6')) 969 af = AF_INET6; 970 971 if (direct) 972 purl = NULL; 973 974 /* check for proxy */ 975 if (purl) { 976 /* XXX proxy authentication! */ 977 conn = fetch_connect(purl->host, purl->port, af, verbose); 978 } else { 979 /* no proxy, go straight to target */ 980 conn = fetch_connect(url->host, url->port, af, verbose); 981 purl = NULL; 982 } 983 984 /* check connection */ 985 if (conn == NULL) 986 /* fetch_connect() has already set an error code */ 987 return (NULL); 988 989 /* expect welcome message */ 990 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 991 goto fouch; 992 993 /* authenticate */ 994 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 995 goto fouch; 996 997 /* TODO: Request extended features supported, if any (RFC 3659). */ 998 999 /* done */ 1000 return (conn); 1001 1002 fouch: 1003 if (e != -1) 1004 ftp_seterr(e); 1005 fetch_close(conn); 1006 return (NULL); 1007 } 1008 1009 /* 1010 * Disconnect from server 1011 */ 1012 static void 1013 ftp_disconnect(conn_t *conn) 1014 { 1015 (void)ftp_cmd(conn, "QUIT"); 1016 if (conn == cached_connection && conn->ref == 1) 1017 cached_connection = NULL; 1018 fetch_close(conn); 1019 } 1020 1021 /* 1022 * Check if we're already connected 1023 */ 1024 static int 1025 ftp_isconnected(struct url *url) 1026 { 1027 return (cached_connection 1028 && (strcmp(url->host, cached_host.host) == 0) 1029 && (strcmp(url->user, cached_host.user) == 0) 1030 && (strcmp(url->pwd, cached_host.pwd) == 0) 1031 && (url->port == cached_host.port)); 1032 } 1033 1034 /* 1035 * Check the cache, reconnect if no luck 1036 */ 1037 static conn_t * 1038 ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1039 { 1040 conn_t *conn; 1041 int e; 1042 1043 /* set default port */ 1044 if (!url->port) 1045 url->port = fetch_default_port(url->scheme); 1046 1047 /* try to use previously cached connection */ 1048 if (ftp_isconnected(url)) { 1049 e = ftp_cmd(cached_connection, "NOOP"); 1050 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1051 return (fetch_ref(cached_connection)); 1052 } 1053 1054 /* connect to server */ 1055 if ((conn = ftp_connect(url, purl, flags)) == NULL) 1056 return (NULL); 1057 if (cached_connection) 1058 ftp_disconnect(cached_connection); 1059 cached_connection = fetch_ref(conn); 1060 memcpy(&cached_host, url, sizeof(*url)); 1061 return (conn); 1062 } 1063 1064 /* 1065 * Check the proxy settings 1066 */ 1067 static struct url * 1068 ftp_get_proxy(struct url * url, const char *flags) 1069 { 1070 struct url *purl; 1071 char *p; 1072 1073 if (flags != NULL && strchr(flags, 'd') != NULL) 1074 return (NULL); 1075 if (fetch_no_proxy_match(url->host)) 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 (strcmp(purl->scheme, SCHEME_FTP) == 0 || 1089 strcmp(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 && (strcmp(purl->scheme, SCHEME_HTTP) == 0 || 1108 strcmp(purl->scheme, SCHEME_HTTPS) == 0)) { 1109 if (strcmp(op, "STAT") == 0) 1110 return (http_request(url, "HEAD", us, purl, flags)); 1111 else if (strcmp(op, "RETR") == 0) 1112 return (http_request(url, "GET", us, purl, flags)); 1113 /* 1114 * Our HTTP code doesn't support PUT requests yet, so try 1115 * a direct connection. 1116 */ 1117 } 1118 1119 /* connect to server */ 1120 conn = ftp_cached_connect(url, purl, flags); 1121 if (purl) 1122 fetchFreeURL(purl); 1123 if (conn == NULL) 1124 return (NULL); 1125 1126 /* change directory */ 1127 if (ftp_cwd(conn, url->doc) == -1) 1128 goto errsock; 1129 1130 /* stat file */ 1131 if (us && ftp_stat(conn, url->doc, us) == -1 1132 && fetchLastErrCode != FETCH_PROTO 1133 && fetchLastErrCode != FETCH_UNAVAIL) 1134 goto errsock; 1135 1136 /* just a stat */ 1137 if (strcmp(op, "STAT") == 0) { 1138 --conn->ref; 1139 ftp_disconnect(conn); 1140 return (FILE *)1; /* bogus return value */ 1141 } 1142 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1143 oflag = O_WRONLY; 1144 else 1145 oflag = O_RDONLY; 1146 1147 /* initiate the transfer */ 1148 return (ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); 1149 1150 errsock: 1151 ftp_disconnect(conn); 1152 return (NULL); 1153 } 1154 1155 /* 1156 * Get and stat file 1157 */ 1158 FILE * 1159 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1160 { 1161 return (ftp_request(url, "RETR", us, ftp_get_proxy(url, flags), flags)); 1162 } 1163 1164 /* 1165 * Get file 1166 */ 1167 FILE * 1168 fetchGetFTP(struct url *url, const char *flags) 1169 { 1170 return (fetchXGetFTP(url, NULL, flags)); 1171 } 1172 1173 /* 1174 * Put file 1175 */ 1176 FILE * 1177 fetchPutFTP(struct url *url, const char *flags) 1178 { 1179 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 1180 ftp_get_proxy(url, flags), flags)); 1181 } 1182 1183 /* 1184 * Get file stats 1185 */ 1186 int 1187 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1188 { 1189 FILE *f; 1190 1191 f = ftp_request(url, "STAT", us, ftp_get_proxy(url, flags), flags); 1192 if (f == NULL) 1193 return (-1); 1194 /* 1195 * When op is "STAT", ftp_request() will return either NULL or 1196 * (FILE *)1, never a valid FILE *, so we mustn't fclose(f) before 1197 * returning, as it would cause a segfault. 1198 */ 1199 return (0); 1200 } 1201 1202 /* 1203 * List a directory 1204 */ 1205 struct url_ent * 1206 fetchListFTP(struct url *url __unused, const char *flags __unused) 1207 { 1208 warnx("fetchListFTP(): not implemented"); 1209 return (NULL); 1210 } 1211