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 /* 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 Smørgrav 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) \ 106 (isdigit((unsigned char)foo[0]) && \ 107 isdigit((unsigned char)foo[1]) && \ 108 isdigit((unsigned char)foo[2]) && \ 109 (foo[3] == ' ' || foo[3] == '\0')) 110 #define isftpinfo(foo) \ 111 (isdigit((unsigned char)foo[0]) && \ 112 isdigit((unsigned char)foo[1]) && \ 113 isdigit((unsigned char)foo[2]) && \ 114 foo[3] == '-') 115 116 /* 117 * Translate IPv4 mapped IPv6 address to IPv4 address 118 */ 119 static void 120 unmappedaddr(struct sockaddr_in6 *sin6) 121 { 122 struct sockaddr_in *sin4; 123 u_int32_t addr; 124 int port; 125 126 if (sin6->sin6_family != AF_INET6 || 127 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 128 return; 129 sin4 = (struct sockaddr_in *)sin6; 130 addr = *(u_int32_t *)(uintptr_t)&sin6->sin6_addr.s6_addr[12]; 131 port = sin6->sin6_port; 132 memset(sin4, 0, sizeof(struct sockaddr_in)); 133 sin4->sin_addr.s_addr = addr; 134 sin4->sin_port = port; 135 sin4->sin_family = AF_INET; 136 sin4->sin_len = sizeof(struct sockaddr_in); 137 } 138 139 /* 140 * Get server response 141 */ 142 static int 143 ftp_chkerr(conn_t *conn) 144 { 145 ssize_t rlen; 146 147 if ((rlen = fetch_getln(conn)) < 0) { 148 fetch_syserr(); 149 return (-1); 150 } 151 152 if (isftpinfo(conn->line)) { 153 while (rlen && !isftpreply(conn->line)) { 154 if ((rlen = fetch_getln(conn)) < 0) { 155 fetch_syserr(); 156 return (-1); 157 } 158 } 159 } 160 161 if (!isftpreply(conn->line)) { 162 ftp_seterr(FTP_PROTOCOL_ERROR); 163 return (-1); 164 } 165 166 conn->err = (conn->line[0] - '0') * 100 167 + (conn->line[1] - '0') * 10 168 + (conn->line[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->line + conn->linelen; 241 src = conn->line + 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 DEBUGF("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 DEBUGF("have: [%.*s|%s]\n", i, pwd, pwd + i); 291 DEBUGF("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 case 'S': 347 break; 348 default: 349 return (FTP_PROTOCOL_ERROR); 350 } 351 if ((e = ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { 352 if (mode == 'S') { 353 /* 354 * Stream mode is supposed to be the default - so 355 * much so that some servers not only do not 356 * support any other mode, but do not support the 357 * MODE command at all. 358 * 359 * If "MODE S" fails, it is unlikely that we 360 * previously succeeded in setting a different 361 * mode. Therefore, we simply hope that the 362 * server is already in the correct mode, and 363 * silently ignore the failure. 364 */ 365 } else { 366 return (e); 367 } 368 } 369 370 switch (type) { 371 case 0: 372 case 'i': 373 type = 'I'; 374 case 'I': 375 break; 376 case 'a': 377 type = 'A'; 378 case 'A': 379 break; 380 case 'd': 381 type = 'D'; 382 case 'D': 383 /* can't handle yet */ 384 default: 385 return (FTP_PROTOCOL_ERROR); 386 } 387 if ((e = ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) 388 return (e); 389 390 return (FTP_OK); 391 } 392 393 /* 394 * Request and parse file stats 395 */ 396 static int 397 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 398 { 399 char *ln; 400 const char *filename; 401 int filenamelen, type; 402 struct tm tm; 403 time_t t; 404 int e; 405 406 us->size = -1; 407 us->atime = us->mtime = 0; 408 409 filename = ftp_filename(file, &filenamelen, &type); 410 411 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 412 ftp_seterr(e); 413 return (-1); 414 } 415 416 e = ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); 417 if (e != FTP_FILE_STATUS) { 418 ftp_seterr(e); 419 return (-1); 420 } 421 for (ln = conn->line + 4; *ln && isspace((unsigned char)*ln); ln++) 422 /* nothing */ ; 423 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 424 us->size = us->size * 10 + *ln - '0'; 425 if (*ln && !isspace((unsigned char)*ln)) { 426 ftp_seterr(FTP_PROTOCOL_ERROR); 427 us->size = -1; 428 return (-1); 429 } 430 if (us->size == 0) 431 us->size = -1; 432 DEBUGF("size: [%lld]\n", (long long)us->size); 433 434 e = ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); 435 if (e != FTP_FILE_STATUS) { 436 ftp_seterr(e); 437 return (-1); 438 } 439 for (ln = conn->line + 4; *ln && isspace((unsigned char)*ln); ln++) 440 /* nothing */ ; 441 switch (strspn(ln, "0123456789")) { 442 case 14: 443 break; 444 case 15: 445 ln++; 446 ln[0] = '2'; 447 ln[1] = '0'; 448 break; 449 default: 450 ftp_seterr(FTP_PROTOCOL_ERROR); 451 return (-1); 452 } 453 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 454 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 455 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 456 ftp_seterr(FTP_PROTOCOL_ERROR); 457 return (-1); 458 } 459 tm.tm_mon--; 460 tm.tm_year -= 1900; 461 tm.tm_isdst = -1; 462 t = timegm(&tm); 463 if (t == (time_t)-1) 464 t = time(NULL); 465 us->mtime = t; 466 us->atime = t; 467 DEBUGF("last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", 468 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 469 tm.tm_hour, tm.tm_min, tm.tm_sec); 470 return (0); 471 } 472 473 /* 474 * I/O functions for FTP 475 */ 476 struct ftpio { 477 conn_t *cconn; /* Control connection */ 478 conn_t *dconn; /* Data connection */ 479 int dir; /* Direction */ 480 int eof; /* EOF reached */ 481 int err; /* Error code */ 482 }; 483 484 static int ftp_readfn(void *, char *, int); 485 static int ftp_writefn(void *, const char *, int); 486 static fpos_t ftp_seekfn(void *, fpos_t, int); 487 static int ftp_closefn(void *); 488 489 static int 490 ftp_readfn(void *v, char *buf, int len) 491 { 492 struct ftpio *io; 493 int r; 494 495 io = (struct ftpio *)v; 496 if (io == NULL) { 497 errno = EBADF; 498 return (-1); 499 } 500 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 501 errno = EBADF; 502 return (-1); 503 } 504 if (io->err) { 505 errno = io->err; 506 return (-1); 507 } 508 if (io->eof) 509 return (0); 510 r = fetch_read(io->dconn, buf, len); 511 if (r > 0) 512 return (r); 513 if (r == 0) { 514 io->eof = 1; 515 return (0); 516 } 517 if (errno != EINTR) 518 io->err = errno; 519 return (-1); 520 } 521 522 static int 523 ftp_writefn(void *v, const char *buf, int len) 524 { 525 struct ftpio *io; 526 int w; 527 528 io = (struct ftpio *)v; 529 if (io == NULL) { 530 errno = EBADF; 531 return (-1); 532 } 533 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 534 errno = EBADF; 535 return (-1); 536 } 537 if (io->err) { 538 errno = io->err; 539 return (-1); 540 } 541 w = fetch_write(io->dconn, buf, len); 542 if (w >= 0) 543 return (w); 544 if (errno != EINTR) 545 io->err = errno; 546 return (-1); 547 } 548 549 static fpos_t 550 ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 551 { 552 struct ftpio *io; 553 554 io = (struct ftpio *)v; 555 if (io == NULL) { 556 errno = EBADF; 557 return (-1); 558 } 559 errno = ESPIPE; 560 return (-1); 561 } 562 563 static int 564 ftp_closefn(void *v) 565 { 566 struct ftpio *io; 567 int r; 568 569 io = (struct ftpio *)v; 570 if (io == NULL) { 571 errno = EBADF; 572 return (-1); 573 } 574 if (io->dir == -1) 575 return (0); 576 if (io->cconn == NULL || io->dconn == NULL) { 577 errno = EBADF; 578 return (-1); 579 } 580 fetch_close(io->dconn); 581 io->dir = -1; 582 io->dconn = NULL; 583 DEBUGF("Waiting for final status\n"); 584 r = ftp_chkerr(io->cconn); 585 if (io->cconn == cached_connection && io->cconn->ref == 1) 586 cached_connection = NULL; 587 fetch_close(io->cconn); 588 free(io); 589 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 590 } 591 592 static FILE * 593 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 594 { 595 struct ftpio *io; 596 FILE *f; 597 598 if (cconn == NULL || dconn == NULL) 599 return (NULL); 600 if ((io = malloc(sizeof(*io))) == NULL) 601 return (NULL); 602 io->cconn = cconn; 603 io->dconn = dconn; 604 io->dir = mode; 605 io->eof = io->err = 0; 606 f = funopen(io, ftp_readfn, ftp_writefn, ftp_seekfn, ftp_closefn); 607 if (f == NULL) 608 free(io); 609 return (f); 610 } 611 612 /* 613 * Transfer file 614 */ 615 static FILE * 616 ftp_transfer(conn_t *conn, const char *oper, const char *file, 617 int mode, off_t offset, const char *flags) 618 { 619 struct sockaddr_storage sa; 620 struct sockaddr_in6 *sin6; 621 struct sockaddr_in *sin4; 622 const char *bindaddr; 623 const char *filename; 624 int filenamelen, type; 625 int low, pasv, verbose; 626 int e, sd = -1; 627 socklen_t l; 628 char *s; 629 FILE *df; 630 631 /* check flags */ 632 low = CHECK_FLAG('l'); 633 pasv = CHECK_FLAG('p') || !CHECK_FLAG('P'); 634 verbose = CHECK_FLAG('v'); 635 636 /* passive mode */ 637 if ((s = getenv("FTP_PASSIVE_MODE")) != NULL) 638 pasv = (strncasecmp(s, "no", 2) != 0); 639 640 /* isolate filename */ 641 filename = ftp_filename(file, &filenamelen, &type); 642 643 /* set transfer mode and data type */ 644 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 645 goto ouch; 646 647 /* find our own address, bind, and listen */ 648 l = sizeof(sa); 649 if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1) 650 goto sysouch; 651 if (sa.ss_family == AF_INET6) 652 unmappedaddr((struct sockaddr_in6 *)&sa); 653 654 /* open data socket */ 655 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 656 fetch_syserr(); 657 return (NULL); 658 } 659 660 if (pasv) { 661 u_char addr[64]; 662 char *ln, *p; 663 unsigned int i; 664 int port; 665 666 /* send PASV command */ 667 if (verbose) 668 fetch_info("setting passive mode"); 669 switch (sa.ss_family) { 670 case AF_INET: 671 if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 672 goto ouch; 673 break; 674 case AF_INET6: 675 if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 676 if (e == -1) 677 goto ouch; 678 if ((e = ftp_cmd(conn, "LPSV")) != 679 FTP_LPASSIVE_MODE) 680 goto ouch; 681 } 682 break; 683 default: 684 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 685 goto ouch; 686 } 687 688 /* 689 * Find address and port number. The reply to the PASV command 690 * is IMHO the one and only weak point in the FTP protocol. 691 */ 692 ln = conn->line; 693 switch (e) { 694 case FTP_PASSIVE_MODE: 695 case FTP_LPASSIVE_MODE: 696 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 697 /* nothing */ ; 698 if (!*p) { 699 e = FTP_PROTOCOL_ERROR; 700 goto ouch; 701 } 702 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 703 for (i = 0; *p && i < l; i++, p++) { 704 addr[i] = strtol(p, &p, 10); 705 if (*p == '\0' && i < l - 1) 706 break; 707 } 708 if (i < l) { 709 e = FTP_PROTOCOL_ERROR; 710 goto ouch; 711 } 712 break; 713 case FTP_EPASSIVE_MODE: 714 for (p = ln + 3; *p && *p != '('; p++) 715 /* nothing */ ; 716 if (!*p) { 717 e = FTP_PROTOCOL_ERROR; 718 goto ouch; 719 } 720 ++p; 721 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 722 &port, &addr[3]) != 5 || 723 addr[0] != addr[1] || 724 addr[0] != addr[2] || addr[0] != addr[3]) { 725 e = FTP_PROTOCOL_ERROR; 726 goto ouch; 727 } 728 break; 729 } 730 731 /* seek to required offset */ 732 if (offset) 733 if (ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) 734 goto sysouch; 735 736 /* construct sockaddr for data socket */ 737 l = sizeof(sa); 738 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 739 goto sysouch; 740 if (sa.ss_family == AF_INET6) 741 unmappedaddr((struct sockaddr_in6 *)&sa); 742 switch (sa.ss_family) { 743 case AF_INET6: 744 sin6 = (struct sockaddr_in6 *)&sa; 745 if (e == FTP_EPASSIVE_MODE) 746 sin6->sin6_port = htons(port); 747 else { 748 memcpy(&sin6->sin6_addr, addr + 2, 16); 749 memcpy(&sin6->sin6_port, addr + 19, 2); 750 } 751 break; 752 case AF_INET: 753 sin4 = (struct sockaddr_in *)&sa; 754 if (e == FTP_EPASSIVE_MODE) 755 sin4->sin_port = htons(port); 756 else { 757 memcpy(&sin4->sin_addr, addr, 4); 758 memcpy(&sin4->sin_port, addr + 4, 2); 759 } 760 break; 761 default: 762 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 763 break; 764 } 765 766 /* connect to data port */ 767 if (verbose) 768 fetch_info("opening data connection"); 769 bindaddr = getenv("FETCH_BIND_ADDRESS"); 770 if (bindaddr != NULL && *bindaddr != '\0' && 771 (e = fetch_bind(sd, sa.ss_family, bindaddr)) != 0) 772 goto ouch; 773 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 774 goto sysouch; 775 776 /* make the server initiate the transfer */ 777 if (verbose) 778 fetch_info("initiating transfer"); 779 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 780 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 781 goto ouch; 782 783 } else { 784 u_int32_t a; 785 u_short p; 786 int arg, d; 787 char *ap; 788 char hname[INET6_ADDRSTRLEN]; 789 790 switch (sa.ss_family) { 791 case AF_INET6: 792 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 793 #ifdef IPV6_PORTRANGE 794 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 795 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 796 (char *)&arg, sizeof(arg)) == -1) 797 goto sysouch; 798 #endif 799 break; 800 case AF_INET: 801 ((struct sockaddr_in *)&sa)->sin_port = 0; 802 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 803 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 804 (char *)&arg, sizeof(arg)) == -1) 805 goto sysouch; 806 break; 807 } 808 if (verbose) 809 fetch_info("binding data socket"); 810 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 811 goto sysouch; 812 if (listen(sd, 1) == -1) 813 goto sysouch; 814 815 /* find what port we're on and tell the server */ 816 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 817 goto sysouch; 818 switch (sa.ss_family) { 819 case AF_INET: 820 sin4 = (struct sockaddr_in *)&sa; 821 a = ntohl(sin4->sin_addr.s_addr); 822 p = ntohs(sin4->sin_port); 823 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 824 (a >> 24) & 0xff, (a >> 16) & 0xff, 825 (a >> 8) & 0xff, a & 0xff, 826 (p >> 8) & 0xff, p & 0xff); 827 break; 828 case AF_INET6: 829 #define UC(b) (((int)b)&0xff) 830 e = -1; 831 sin6 = (struct sockaddr_in6 *)&sa; 832 sin6->sin6_scope_id = 0; 833 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 834 hname, sizeof(hname), 835 NULL, 0, NI_NUMERICHOST) == 0) { 836 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 837 htons(sin6->sin6_port)); 838 if (e == -1) 839 goto ouch; 840 } 841 if (e != FTP_OK) { 842 ap = (char *)&sin6->sin6_addr; 843 e = ftp_cmd(conn, 844 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 845 6, 16, 846 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 847 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 848 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 849 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 850 2, 851 (ntohs(sin6->sin6_port) >> 8) & 0xff, 852 ntohs(sin6->sin6_port) & 0xff); 853 } 854 break; 855 default: 856 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 857 goto ouch; 858 } 859 if (e != FTP_OK) 860 goto ouch; 861 862 /* seek to required offset */ 863 if (offset) 864 if (ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) 865 goto sysouch; 866 867 /* make the server initiate the transfer */ 868 if (verbose) 869 fetch_info("initiating transfer"); 870 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 871 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 872 goto ouch; 873 874 /* accept the incoming connection and go to town */ 875 if ((d = accept(sd, NULL, NULL)) == -1) 876 goto sysouch; 877 close(sd); 878 sd = d; 879 } 880 881 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 882 goto sysouch; 883 return (df); 884 885 sysouch: 886 fetch_syserr(); 887 if (sd >= 0) 888 close(sd); 889 return (NULL); 890 891 ouch: 892 if (e != -1) 893 ftp_seterr(e); 894 if (sd >= 0) 895 close(sd); 896 return (NULL); 897 } 898 899 /* 900 * Authenticate 901 */ 902 static int 903 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 904 { 905 const char *user, *pwd, *logname; 906 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 907 int e, len; 908 909 /* XXX FTP_AUTH, and maybe .netrc */ 910 911 /* send user name and password */ 912 if (url->user[0] == '\0') 913 fetch_netrc_auth(url); 914 user = url->user; 915 if (*user == '\0') 916 if ((user = getenv("FTP_LOGIN")) != NULL) 917 DEBUGF("FTP_LOGIN=%s\n", user); 918 if (user == NULL || *user == '\0') 919 user = FTP_ANONYMOUS_USER; 920 if (purl && url->port == fetch_default_port(url->scheme)) 921 e = ftp_cmd(conn, "USER %s@%s", user, url->host); 922 else if (purl) 923 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 924 else 925 e = ftp_cmd(conn, "USER %s", user); 926 927 /* did the server request a password? */ 928 if (e == FTP_NEED_PASSWORD) { 929 pwd = url->pwd; 930 if (*pwd == '\0') 931 if ((pwd = getenv("FTP_PASSWORD")) != NULL) 932 DEBUGF("FTP_PASSWORD=%s\n", pwd); 933 if (pwd == NULL || *pwd == '\0') { 934 if ((logname = getlogin()) == NULL) 935 logname = FTP_ANONYMOUS_USER; 936 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 937 len = 0; 938 else if (len > MAXLOGNAME) 939 len = MAXLOGNAME; 940 gethostname(pbuf + len, sizeof(pbuf) - len); 941 pwd = pbuf; 942 } 943 e = ftp_cmd(conn, "PASS %s", pwd); 944 } 945 946 return (e); 947 } 948 949 /* 950 * Log on to FTP server 951 */ 952 static conn_t * 953 ftp_connect(struct url *url, struct url *purl, const char *flags) 954 { 955 conn_t *conn; 956 int e, direct, verbose; 957 #ifdef INET6 958 int af = AF_UNSPEC; 959 #else 960 int af = AF_INET; 961 #endif 962 963 direct = CHECK_FLAG('d'); 964 verbose = CHECK_FLAG('v'); 965 if (CHECK_FLAG('4')) 966 af = AF_INET; 967 else if (CHECK_FLAG('6')) 968 af = AF_INET6; 969 970 if (direct) 971 purl = NULL; 972 973 /* check for proxy */ 974 if (purl) { 975 /* XXX proxy authentication! */ 976 conn = fetch_connect(purl->host, purl->port, af, verbose); 977 } else { 978 /* no proxy, go straight to target */ 979 conn = fetch_connect(url->host, url->port, af, verbose); 980 purl = NULL; 981 } 982 983 /* check connection */ 984 if (conn == NULL) 985 /* fetch_connect() has already set an error code */ 986 return (NULL); 987 988 /* expect welcome message */ 989 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 990 goto fouch; 991 992 /* authenticate */ 993 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 994 goto fouch; 995 996 /* TODO: Request extended features supported, if any (RFC 3659). */ 997 998 /* done */ 999 return (conn); 1000 1001 fouch: 1002 if (e != -1) 1003 ftp_seterr(e); 1004 fetch_close(conn); 1005 return (NULL); 1006 } 1007 1008 /* 1009 * Disconnect from server 1010 */ 1011 static void 1012 ftp_disconnect(conn_t *conn) 1013 { 1014 (void)ftp_cmd(conn, "QUIT"); 1015 if (conn == cached_connection && conn->ref == 1) 1016 cached_connection = NULL; 1017 fetch_close(conn); 1018 } 1019 1020 /* 1021 * Check if we're already connected 1022 */ 1023 static int 1024 ftp_isconnected(struct url *url) 1025 { 1026 return (cached_connection 1027 && (strcmp(url->host, cached_host.host) == 0) 1028 && (strcmp(url->user, cached_host.user) == 0) 1029 && (strcmp(url->pwd, cached_host.pwd) == 0) 1030 && (url->port == cached_host.port)); 1031 } 1032 1033 /* 1034 * Check the cache, reconnect if no luck 1035 */ 1036 static conn_t * 1037 ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1038 { 1039 conn_t *conn; 1040 int e; 1041 1042 /* set default port */ 1043 if (!url->port) 1044 url->port = fetch_default_port(url->scheme); 1045 1046 /* try to use previously cached connection */ 1047 if (ftp_isconnected(url)) { 1048 e = ftp_cmd(cached_connection, "NOOP"); 1049 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1050 return (fetch_ref(cached_connection)); 1051 } 1052 1053 /* connect to server */ 1054 if ((conn = ftp_connect(url, purl, flags)) == NULL) 1055 return (NULL); 1056 if (cached_connection) 1057 ftp_disconnect(cached_connection); 1058 cached_connection = fetch_ref(conn); 1059 memcpy(&cached_host, url, sizeof(*url)); 1060 return (conn); 1061 } 1062 1063 /* 1064 * Check the proxy settings 1065 */ 1066 static struct url * 1067 ftp_get_proxy(struct url * url, const char *flags) 1068 { 1069 struct url *purl; 1070 char *p; 1071 1072 if (flags != NULL && strchr(flags, 'd') != NULL) 1073 return (NULL); 1074 if (fetch_no_proxy_match(url->host)) 1075 return (NULL); 1076 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1077 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1078 *p && (purl = fetchParseURL(p)) != NULL) { 1079 if (!*purl->scheme) { 1080 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1081 strcpy(purl->scheme, SCHEME_FTP); 1082 else 1083 strcpy(purl->scheme, SCHEME_HTTP); 1084 } 1085 if (!purl->port) 1086 purl->port = fetch_default_proxy_port(purl->scheme); 1087 if (strcmp(purl->scheme, SCHEME_FTP) == 0 || 1088 strcmp(purl->scheme, SCHEME_HTTP) == 0) 1089 return (purl); 1090 fetchFreeURL(purl); 1091 } 1092 return (NULL); 1093 } 1094 1095 /* 1096 * Process an FTP request 1097 */ 1098 FILE * 1099 ftp_request(struct url *url, const char *op, struct url_stat *us, 1100 struct url *purl, const char *flags) 1101 { 1102 conn_t *conn; 1103 int oflag; 1104 1105 /* check if we should use HTTP instead */ 1106 if (purl && (strcmp(purl->scheme, SCHEME_HTTP) == 0 || 1107 strcmp(purl->scheme, SCHEME_HTTPS) == 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 goto errsock; 1128 1129 /* stat file */ 1130 if (us && ftp_stat(conn, url->doc, us) == -1 1131 && fetchLastErrCode != FETCH_PROTO 1132 && fetchLastErrCode != FETCH_UNAVAIL) 1133 goto errsock; 1134 1135 /* just a stat */ 1136 if (strcmp(op, "STAT") == 0) { 1137 fetch_deref(conn); 1138 ftp_disconnect(conn); 1139 return (FILE *)1; /* bogus return value */ 1140 } 1141 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1142 oflag = O_WRONLY; 1143 else 1144 oflag = O_RDONLY; 1145 1146 /* initiate the transfer */ 1147 return (ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); 1148 1149 errsock: 1150 ftp_disconnect(conn); 1151 return (NULL); 1152 } 1153 1154 /* 1155 * Get and stat file 1156 */ 1157 FILE * 1158 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1159 { 1160 return (ftp_request(url, "RETR", us, ftp_get_proxy(url, flags), flags)); 1161 } 1162 1163 /* 1164 * Get file 1165 */ 1166 FILE * 1167 fetchGetFTP(struct url *url, const char *flags) 1168 { 1169 return (fetchXGetFTP(url, NULL, flags)); 1170 } 1171 1172 /* 1173 * Put file 1174 */ 1175 FILE * 1176 fetchPutFTP(struct url *url, const char *flags) 1177 { 1178 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 1179 ftp_get_proxy(url, flags), flags)); 1180 } 1181 1182 /* 1183 * Get file stats 1184 */ 1185 int 1186 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1187 { 1188 FILE *f; 1189 1190 f = ftp_request(url, "STAT", us, ftp_get_proxy(url, flags), flags); 1191 if (f == NULL) 1192 return (-1); 1193 /* 1194 * When op is "STAT", ftp_request() will return either NULL or 1195 * (FILE *)1, never a valid FILE *, so we mustn't fclose(f) before 1196 * returning, as it would cause a segfault. 1197 */ 1198 return (0); 1199 } 1200 1201 /* 1202 * List a directory 1203 */ 1204 struct url_ent * 1205 fetchListFTP(struct url *url __unused, const char *flags __unused) 1206 { 1207 warnx("fetchListFTP(): not implemented"); 1208 return (NULL); 1209 } 1210