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 if (isftpinfo(conn->buf)) { 152 while (conn->buflen && !isftpreply(conn->buf)) { 153 if ((rlen = fetch_getln(conn)) < 0) { 154 fetch_syserr(); 155 return (-1); 156 } 157 } 158 } 159 160 if (!isftpreply(conn->buf)) { 161 ftp_seterr(FTP_PROTOCOL_ERROR); 162 return (-1); 163 } 164 165 conn->err = (conn->buf[0] - '0') * 100 166 + (conn->buf[1] - '0') * 10 167 + (conn->buf[2] - '0'); 168 169 return (conn->err); 170 } 171 172 /* 173 * Send a command and check reply 174 */ 175 static int 176 ftp_cmd(conn_t *conn, const char *fmt, ...) 177 { 178 va_list ap; 179 size_t len; 180 char *msg; 181 int r; 182 183 va_start(ap, fmt); 184 len = vasprintf(&msg, fmt, ap); 185 va_end(ap); 186 187 if (msg == NULL) { 188 errno = ENOMEM; 189 fetch_syserr(); 190 return (-1); 191 } 192 193 r = fetch_putln(conn, msg, len); 194 free(msg); 195 196 if (r == -1) { 197 fetch_syserr(); 198 return (-1); 199 } 200 201 return (ftp_chkerr(conn)); 202 } 203 204 /* 205 * Return a pointer to the filename part of a path 206 */ 207 static const char * 208 ftp_filename(const char *file, int *len, int *type) 209 { 210 const char *s; 211 212 if ((s = strrchr(file, '/')) == NULL) 213 s = file; 214 else 215 s = s + 1; 216 *len = strlen(s); 217 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 218 *type = s[*len - 1]; 219 *len -= 7; 220 } else { 221 *type = '\0'; 222 } 223 return (s); 224 } 225 226 /* 227 * Get current working directory from the reply to a CWD, PWD or CDUP 228 * command. 229 */ 230 static int 231 ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen) 232 { 233 char *src, *dst, *end; 234 int q; 235 236 if (conn->err != FTP_WORKING_DIRECTORY && 237 conn->err != FTP_FILE_ACTION_OK) 238 return (FTP_PROTOCOL_ERROR); 239 end = conn->buf + conn->buflen; 240 src = conn->buf + 4; 241 if (src >= end || *src++ != '"') 242 return (FTP_PROTOCOL_ERROR); 243 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { 244 if (!q && *src == '"') 245 q = 1; 246 else if (q && *src != '"') 247 break; 248 else if (q) 249 *dst++ = '"', q = 0; 250 else 251 *dst++ = *src; 252 } 253 if (!pwdlen) 254 return (FTP_PROTOCOL_ERROR); 255 *dst = '\0'; 256 #if 0 257 DEBUGF("pwd: [%s]\n", pwd); 258 #endif 259 return (FTP_OK); 260 } 261 262 /* 263 * Change working directory to the directory that contains the specified 264 * file. 265 */ 266 static int 267 ftp_cwd(conn_t *conn, const char *file) 268 { 269 const char *beg, *end; 270 char pwd[PATH_MAX]; 271 int e, i, len; 272 273 /* If no slashes in name, no need to change dirs. */ 274 if ((end = strrchr(file, '/')) == NULL) 275 return (0); 276 if ((e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 277 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 278 ftp_seterr(e); 279 return (-1); 280 } 281 for (;;) { 282 len = strlen(pwd); 283 284 /* Look for a common prefix between PWD and dir to fetch. */ 285 for (i = 0; i <= len && i <= end - file; ++i) 286 if (pwd[i] != file[i]) 287 break; 288 #if 0 289 DEBUGF("have: [%.*s|%s]\n", i, pwd, pwd + i); 290 DEBUGF("want: [%.*s|%s]\n", i, file, file + i); 291 #endif 292 /* Keep going up a dir until we have a matching prefix. */ 293 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) 294 break; 295 if ((e = ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || 296 (e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 297 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 298 ftp_seterr(e); 299 return (-1); 300 } 301 } 302 303 #ifdef FTP_COMBINE_CWDS 304 /* Skip leading slashes, even "////". */ 305 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) 306 /* nothing */ ; 307 308 /* If there is no trailing dir, we're already there. */ 309 if (beg >= end) 310 return (0); 311 312 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 313 e = ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); 314 if (e == FTP_FILE_ACTION_OK) 315 return (0); 316 #endif /* FTP_COMBINE_CWDS */ 317 318 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 319 for (beg = file + i; beg < end; beg = file + i + 1) { 320 while (*beg == '/') 321 ++beg, ++i; 322 for (++i; file + i < end && file[i] != '/'; ++i) 323 /* nothing */ ; 324 e = ftp_cmd(conn, "CWD %.*s", file + i - beg, beg); 325 if (e != FTP_FILE_ACTION_OK) { 326 ftp_seterr(e); 327 return (-1); 328 } 329 } 330 return (0); 331 } 332 333 /* 334 * Set transfer mode and data type 335 */ 336 static int 337 ftp_mode_type(conn_t *conn, int mode, int type) 338 { 339 int e; 340 341 switch (mode) { 342 case 0: 343 case 's': 344 mode = 'S'; 345 case 'S': 346 break; 347 default: 348 return (FTP_PROTOCOL_ERROR); 349 } 350 if ((e = ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { 351 if (mode == 'S') { 352 /* 353 * Stream mode is supposed to be the default - so 354 * much so that some servers not only do not 355 * support any other mode, but do not support the 356 * MODE command at all. 357 * 358 * If "MODE S" fails, it is unlikely that we 359 * previously succeeded in setting a different 360 * mode. Therefore, we simply hope that the 361 * server is already in the correct mode, and 362 * silently ignore the failure. 363 */ 364 } else { 365 return (e); 366 } 367 } 368 369 switch (type) { 370 case 0: 371 case 'i': 372 type = 'I'; 373 case 'I': 374 break; 375 case 'a': 376 type = 'A'; 377 case 'A': 378 break; 379 case 'd': 380 type = 'D'; 381 case 'D': 382 /* can't handle yet */ 383 default: 384 return (FTP_PROTOCOL_ERROR); 385 } 386 if ((e = ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) 387 return (e); 388 389 return (FTP_OK); 390 } 391 392 /* 393 * Request and parse file stats 394 */ 395 static int 396 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 397 { 398 char *ln; 399 const char *filename; 400 int filenamelen, type; 401 struct tm tm; 402 time_t t; 403 int e; 404 405 us->size = -1; 406 us->atime = us->mtime = 0; 407 408 filename = ftp_filename(file, &filenamelen, &type); 409 410 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 411 ftp_seterr(e); 412 return (-1); 413 } 414 415 e = ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); 416 if (e != FTP_FILE_STATUS) { 417 ftp_seterr(e); 418 return (-1); 419 } 420 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 421 /* nothing */ ; 422 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 423 us->size = us->size * 10 + *ln - '0'; 424 if (*ln && !isspace((unsigned char)*ln)) { 425 ftp_seterr(FTP_PROTOCOL_ERROR); 426 us->size = -1; 427 return (-1); 428 } 429 if (us->size == 0) 430 us->size = -1; 431 DEBUGF("size: [%lld]\n", (long long)us->size); 432 433 e = ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); 434 if (e != FTP_FILE_STATUS) { 435 ftp_seterr(e); 436 return (-1); 437 } 438 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 439 /* nothing */ ; 440 switch (strspn(ln, "0123456789")) { 441 case 14: 442 break; 443 case 15: 444 ln++; 445 ln[0] = '2'; 446 ln[1] = '0'; 447 break; 448 default: 449 ftp_seterr(FTP_PROTOCOL_ERROR); 450 return (-1); 451 } 452 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 453 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 454 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 455 ftp_seterr(FTP_PROTOCOL_ERROR); 456 return (-1); 457 } 458 tm.tm_mon--; 459 tm.tm_year -= 1900; 460 tm.tm_isdst = -1; 461 t = timegm(&tm); 462 if (t == (time_t)-1) 463 t = time(NULL); 464 us->mtime = t; 465 us->atime = t; 466 DEBUGF("last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", 467 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 468 tm.tm_hour, tm.tm_min, tm.tm_sec); 469 return (0); 470 } 471 472 /* 473 * I/O functions for FTP 474 */ 475 struct ftpio { 476 conn_t *cconn; /* Control connection */ 477 conn_t *dconn; /* Data connection */ 478 int dir; /* Direction */ 479 int eof; /* EOF reached */ 480 int err; /* Error code */ 481 }; 482 483 static int ftp_readfn(void *, char *, int); 484 static int ftp_writefn(void *, const char *, int); 485 static fpos_t ftp_seekfn(void *, fpos_t, int); 486 static int ftp_closefn(void *); 487 488 static int 489 ftp_readfn(void *v, char *buf, int len) 490 { 491 struct ftpio *io; 492 int r; 493 494 io = (struct ftpio *)v; 495 if (io == NULL) { 496 errno = EBADF; 497 return (-1); 498 } 499 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 500 errno = EBADF; 501 return (-1); 502 } 503 if (io->err) { 504 errno = io->err; 505 return (-1); 506 } 507 if (io->eof) 508 return (0); 509 r = fetch_read(io->dconn, buf, len); 510 if (r > 0) 511 return (r); 512 if (r == 0) { 513 io->eof = 1; 514 return (0); 515 } 516 if (errno != EINTR) 517 io->err = errno; 518 return (-1); 519 } 520 521 static int 522 ftp_writefn(void *v, const char *buf, int len) 523 { 524 struct ftpio *io; 525 int w; 526 527 io = (struct ftpio *)v; 528 if (io == NULL) { 529 errno = EBADF; 530 return (-1); 531 } 532 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 533 errno = EBADF; 534 return (-1); 535 } 536 if (io->err) { 537 errno = io->err; 538 return (-1); 539 } 540 w = fetch_write(io->dconn, buf, len); 541 if (w >= 0) 542 return (w); 543 if (errno != EINTR) 544 io->err = errno; 545 return (-1); 546 } 547 548 static fpos_t 549 ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 550 { 551 struct ftpio *io; 552 553 io = (struct ftpio *)v; 554 if (io == NULL) { 555 errno = EBADF; 556 return (-1); 557 } 558 errno = ESPIPE; 559 return (-1); 560 } 561 562 static int 563 ftp_closefn(void *v) 564 { 565 struct ftpio *io; 566 int r; 567 568 io = (struct ftpio *)v; 569 if (io == NULL) { 570 errno = EBADF; 571 return (-1); 572 } 573 if (io->dir == -1) 574 return (0); 575 if (io->cconn == NULL || io->dconn == NULL) { 576 errno = EBADF; 577 return (-1); 578 } 579 fetch_close(io->dconn); 580 io->dir = -1; 581 io->dconn = NULL; 582 DEBUGF("Waiting for final status\n"); 583 r = ftp_chkerr(io->cconn); 584 if (io->cconn == cached_connection && io->cconn->ref == 1) 585 cached_connection = NULL; 586 fetch_close(io->cconn); 587 free(io); 588 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 589 } 590 591 static FILE * 592 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 593 { 594 struct ftpio *io; 595 FILE *f; 596 597 if (cconn == NULL || dconn == NULL) 598 return (NULL); 599 if ((io = malloc(sizeof(*io))) == NULL) 600 return (NULL); 601 io->cconn = cconn; 602 io->dconn = dconn; 603 io->dir = mode; 604 io->eof = io->err = 0; 605 f = funopen(io, ftp_readfn, ftp_writefn, ftp_seekfn, ftp_closefn); 606 if (f == NULL) 607 free(io); 608 return (f); 609 } 610 611 /* 612 * Transfer file 613 */ 614 static FILE * 615 ftp_transfer(conn_t *conn, const char *oper, const char *file, 616 int mode, off_t offset, const char *flags) 617 { 618 struct sockaddr_storage sa; 619 struct sockaddr_in6 *sin6; 620 struct sockaddr_in *sin4; 621 const char *bindaddr; 622 const char *filename; 623 int filenamelen, type; 624 int low, pasv, verbose; 625 int e, sd = -1; 626 socklen_t l; 627 char *s; 628 FILE *df; 629 630 /* check flags */ 631 low = CHECK_FLAG('l'); 632 pasv = CHECK_FLAG('p') || !CHECK_FLAG('P'); 633 verbose = CHECK_FLAG('v'); 634 635 /* passive mode */ 636 if ((s = getenv("FTP_PASSIVE_MODE")) != NULL) 637 pasv = (strncasecmp(s, "no", 2) != 0); 638 639 /* isolate filename */ 640 filename = ftp_filename(file, &filenamelen, &type); 641 642 /* set transfer mode and data type */ 643 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 644 goto ouch; 645 646 /* find our own address, bind, and listen */ 647 l = sizeof(sa); 648 if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1) 649 goto sysouch; 650 if (sa.ss_family == AF_INET6) 651 unmappedaddr((struct sockaddr_in6 *)&sa); 652 653 /* open data socket */ 654 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 655 fetch_syserr(); 656 return (NULL); 657 } 658 659 if (pasv) { 660 u_char addr[64]; 661 char *ln, *p; 662 unsigned int i; 663 int port; 664 665 /* send PASV command */ 666 if (verbose) 667 fetch_info("setting passive mode"); 668 switch (sa.ss_family) { 669 case AF_INET: 670 if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 671 goto ouch; 672 break; 673 case AF_INET6: 674 if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 675 if (e == -1) 676 goto ouch; 677 if ((e = ftp_cmd(conn, "LPSV")) != 678 FTP_LPASSIVE_MODE) 679 goto ouch; 680 } 681 break; 682 default: 683 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 684 goto ouch; 685 } 686 687 /* 688 * Find address and port number. The reply to the PASV command 689 * is IMHO the one and only weak point in the FTP protocol. 690 */ 691 ln = conn->buf; 692 switch (e) { 693 case FTP_PASSIVE_MODE: 694 case FTP_LPASSIVE_MODE: 695 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 696 /* nothing */ ; 697 if (!*p) { 698 e = FTP_PROTOCOL_ERROR; 699 goto ouch; 700 } 701 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 702 for (i = 0; *p && i < l; i++, p++) { 703 addr[i] = strtol(p, &p, 10); 704 if (*p == '\0' && i < l - 1) 705 break; 706 } 707 if (i < l) { 708 e = FTP_PROTOCOL_ERROR; 709 goto ouch; 710 } 711 break; 712 case FTP_EPASSIVE_MODE: 713 for (p = ln + 3; *p && *p != '('; p++) 714 /* nothing */ ; 715 if (!*p) { 716 e = FTP_PROTOCOL_ERROR; 717 goto ouch; 718 } 719 ++p; 720 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 721 &port, &addr[3]) != 5 || 722 addr[0] != addr[1] || 723 addr[0] != addr[2] || addr[0] != addr[3]) { 724 e = FTP_PROTOCOL_ERROR; 725 goto ouch; 726 } 727 break; 728 } 729 730 /* seek to required offset */ 731 if (offset) 732 if (ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) 733 goto sysouch; 734 735 /* construct sockaddr for data socket */ 736 l = sizeof(sa); 737 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 738 goto sysouch; 739 if (sa.ss_family == AF_INET6) 740 unmappedaddr((struct sockaddr_in6 *)&sa); 741 switch (sa.ss_family) { 742 case AF_INET6: 743 sin6 = (struct sockaddr_in6 *)&sa; 744 if (e == FTP_EPASSIVE_MODE) 745 sin6->sin6_port = htons(port); 746 else { 747 memcpy(&sin6->sin6_addr, addr + 2, 16); 748 memcpy(&sin6->sin6_port, addr + 19, 2); 749 } 750 break; 751 case AF_INET: 752 sin4 = (struct sockaddr_in *)&sa; 753 if (e == FTP_EPASSIVE_MODE) 754 sin4->sin_port = htons(port); 755 else { 756 memcpy(&sin4->sin_addr, addr, 4); 757 memcpy(&sin4->sin_port, addr + 4, 2); 758 } 759 break; 760 default: 761 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 762 break; 763 } 764 765 /* connect to data port */ 766 if (verbose) 767 fetch_info("opening data connection"); 768 bindaddr = getenv("FETCH_BIND_ADDRESS"); 769 if (bindaddr != NULL && *bindaddr != '\0' && 770 (e = fetch_bind(sd, sa.ss_family, bindaddr)) != 0) 771 goto ouch; 772 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 773 goto sysouch; 774 775 /* make the server initiate the transfer */ 776 if (verbose) 777 fetch_info("initiating transfer"); 778 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 779 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 780 goto ouch; 781 782 } else { 783 u_int32_t a; 784 u_short p; 785 int arg, d; 786 char *ap; 787 char hname[INET6_ADDRSTRLEN]; 788 789 switch (sa.ss_family) { 790 case AF_INET6: 791 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 792 #ifdef IPV6_PORTRANGE 793 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 794 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 795 (char *)&arg, sizeof(arg)) == -1) 796 goto sysouch; 797 #endif 798 break; 799 case AF_INET: 800 ((struct sockaddr_in *)&sa)->sin_port = 0; 801 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 802 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 803 (char *)&arg, sizeof(arg)) == -1) 804 goto sysouch; 805 break; 806 } 807 if (verbose) 808 fetch_info("binding data socket"); 809 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 810 goto sysouch; 811 if (listen(sd, 1) == -1) 812 goto sysouch; 813 814 /* find what port we're on and tell the server */ 815 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 816 goto sysouch; 817 switch (sa.ss_family) { 818 case AF_INET: 819 sin4 = (struct sockaddr_in *)&sa; 820 a = ntohl(sin4->sin_addr.s_addr); 821 p = ntohs(sin4->sin_port); 822 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 823 (a >> 24) & 0xff, (a >> 16) & 0xff, 824 (a >> 8) & 0xff, a & 0xff, 825 (p >> 8) & 0xff, p & 0xff); 826 break; 827 case AF_INET6: 828 #define UC(b) (((int)b)&0xff) 829 e = -1; 830 sin6 = (struct sockaddr_in6 *)&sa; 831 sin6->sin6_scope_id = 0; 832 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 833 hname, sizeof(hname), 834 NULL, 0, NI_NUMERICHOST) == 0) { 835 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 836 htons(sin6->sin6_port)); 837 if (e == -1) 838 goto ouch; 839 } 840 if (e != FTP_OK) { 841 ap = (char *)&sin6->sin6_addr; 842 e = ftp_cmd(conn, 843 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 844 6, 16, 845 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 846 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 847 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 848 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 849 2, 850 (ntohs(sin6->sin6_port) >> 8) & 0xff, 851 ntohs(sin6->sin6_port) & 0xff); 852 } 853 break; 854 default: 855 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 856 goto ouch; 857 } 858 if (e != FTP_OK) 859 goto ouch; 860 861 /* seek to required offset */ 862 if (offset) 863 if (ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) 864 goto sysouch; 865 866 /* make the server initiate the transfer */ 867 if (verbose) 868 fetch_info("initiating transfer"); 869 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 870 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 871 goto ouch; 872 873 /* accept the incoming connection and go to town */ 874 if ((d = accept(sd, NULL, NULL)) == -1) 875 goto sysouch; 876 close(sd); 877 sd = d; 878 } 879 880 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 881 goto sysouch; 882 return (df); 883 884 sysouch: 885 fetch_syserr(); 886 if (sd >= 0) 887 close(sd); 888 return (NULL); 889 890 ouch: 891 if (e != -1) 892 ftp_seterr(e); 893 if (sd >= 0) 894 close(sd); 895 return (NULL); 896 } 897 898 /* 899 * Authenticate 900 */ 901 static int 902 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 903 { 904 const char *user, *pwd, *logname; 905 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 906 int e, len; 907 908 /* XXX FTP_AUTH, and maybe .netrc */ 909 910 /* send user name and password */ 911 if (url->user[0] == '\0') 912 fetch_netrc_auth(url); 913 user = url->user; 914 if (*user == '\0') 915 if ((user = getenv("FTP_LOGIN")) != NULL) 916 DEBUGF("FTP_LOGIN=%s\n", user); 917 if (user == NULL || *user == '\0') 918 user = FTP_ANONYMOUS_USER; 919 if (purl && url->port == fetch_default_port(url->scheme)) 920 e = ftp_cmd(conn, "USER %s@%s", user, url->host); 921 else if (purl) 922 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 923 else 924 e = ftp_cmd(conn, "USER %s", user); 925 926 /* did the server request a password? */ 927 if (e == FTP_NEED_PASSWORD) { 928 pwd = url->pwd; 929 if (*pwd == '\0') 930 if ((pwd = getenv("FTP_PASSWORD")) != NULL) 931 DEBUGF("FTP_PASSWORD=%s\n", pwd); 932 if (pwd == NULL || *pwd == '\0') { 933 if ((logname = getlogin()) == NULL) 934 logname = FTP_ANONYMOUS_USER; 935 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 936 len = 0; 937 else if (len > MAXLOGNAME) 938 len = MAXLOGNAME; 939 gethostname(pbuf + len, sizeof(pbuf) - len); 940 pwd = pbuf; 941 } 942 e = ftp_cmd(conn, "PASS %s", pwd); 943 } 944 945 return (e); 946 } 947 948 /* 949 * Log on to FTP server 950 */ 951 static conn_t * 952 ftp_connect(struct url *url, struct url *purl, const char *flags) 953 { 954 conn_t *conn; 955 int e, direct, verbose; 956 #ifdef INET6 957 int af = AF_UNSPEC; 958 #else 959 int af = AF_INET; 960 #endif 961 962 direct = CHECK_FLAG('d'); 963 verbose = CHECK_FLAG('v'); 964 if (CHECK_FLAG('4')) 965 af = AF_INET; 966 else if (CHECK_FLAG('6')) 967 af = AF_INET6; 968 969 if (direct) 970 purl = NULL; 971 972 /* check for proxy */ 973 if (purl) { 974 /* XXX proxy authentication! */ 975 conn = fetch_connect(purl->host, purl->port, af, verbose); 976 } else { 977 /* no proxy, go straight to target */ 978 conn = fetch_connect(url->host, url->port, af, verbose); 979 purl = NULL; 980 } 981 982 /* check connection */ 983 if (conn == NULL) 984 /* fetch_connect() has already set an error code */ 985 return (NULL); 986 987 /* expect welcome message */ 988 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 989 goto fouch; 990 991 /* authenticate */ 992 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 993 goto fouch; 994 995 /* TODO: Request extended features supported, if any (RFC 3659). */ 996 997 /* done */ 998 return (conn); 999 1000 fouch: 1001 if (e != -1) 1002 ftp_seterr(e); 1003 fetch_close(conn); 1004 return (NULL); 1005 } 1006 1007 /* 1008 * Disconnect from server 1009 */ 1010 static void 1011 ftp_disconnect(conn_t *conn) 1012 { 1013 (void)ftp_cmd(conn, "QUIT"); 1014 if (conn == cached_connection && conn->ref == 1) 1015 cached_connection = NULL; 1016 fetch_close(conn); 1017 } 1018 1019 /* 1020 * Check if we're already connected 1021 */ 1022 static int 1023 ftp_isconnected(struct url *url) 1024 { 1025 return (cached_connection 1026 && (strcmp(url->host, cached_host.host) == 0) 1027 && (strcmp(url->user, cached_host.user) == 0) 1028 && (strcmp(url->pwd, cached_host.pwd) == 0) 1029 && (url->port == cached_host.port)); 1030 } 1031 1032 /* 1033 * Check the cache, reconnect if no luck 1034 */ 1035 static conn_t * 1036 ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1037 { 1038 conn_t *conn; 1039 int e; 1040 1041 /* set default port */ 1042 if (!url->port) 1043 url->port = fetch_default_port(url->scheme); 1044 1045 /* try to use previously cached connection */ 1046 if (ftp_isconnected(url)) { 1047 e = ftp_cmd(cached_connection, "NOOP"); 1048 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1049 return (fetch_ref(cached_connection)); 1050 } 1051 1052 /* connect to server */ 1053 if ((conn = ftp_connect(url, purl, flags)) == NULL) 1054 return (NULL); 1055 if (cached_connection) 1056 ftp_disconnect(cached_connection); 1057 cached_connection = fetch_ref(conn); 1058 memcpy(&cached_host, url, sizeof(*url)); 1059 return (conn); 1060 } 1061 1062 /* 1063 * Check the proxy settings 1064 */ 1065 static struct url * 1066 ftp_get_proxy(struct url * url, const char *flags) 1067 { 1068 struct url *purl; 1069 char *p; 1070 1071 if (flags != NULL && strchr(flags, 'd') != NULL) 1072 return (NULL); 1073 if (fetch_no_proxy_match(url->host)) 1074 return (NULL); 1075 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1076 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1077 *p && (purl = fetchParseURL(p)) != NULL) { 1078 if (!*purl->scheme) { 1079 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1080 strcpy(purl->scheme, SCHEME_FTP); 1081 else 1082 strcpy(purl->scheme, SCHEME_HTTP); 1083 } 1084 if (!purl->port) 1085 purl->port = fetch_default_proxy_port(purl->scheme); 1086 if (strcmp(purl->scheme, SCHEME_FTP) == 0 || 1087 strcmp(purl->scheme, SCHEME_HTTP) == 0) 1088 return (purl); 1089 fetchFreeURL(purl); 1090 } 1091 return (NULL); 1092 } 1093 1094 /* 1095 * Process an FTP request 1096 */ 1097 FILE * 1098 ftp_request(struct url *url, const char *op, struct url_stat *us, 1099 struct url *purl, const char *flags) 1100 { 1101 conn_t *conn; 1102 int oflag; 1103 1104 /* check if we should use HTTP instead */ 1105 if (purl && (strcmp(purl->scheme, SCHEME_HTTP) == 0 || 1106 strcmp(purl->scheme, SCHEME_HTTPS) == 0)) { 1107 if (strcmp(op, "STAT") == 0) 1108 return (http_request(url, "HEAD", us, purl, flags)); 1109 else if (strcmp(op, "RETR") == 0) 1110 return (http_request(url, "GET", us, purl, flags)); 1111 /* 1112 * Our HTTP code doesn't support PUT requests yet, so try 1113 * a direct connection. 1114 */ 1115 } 1116 1117 /* connect to server */ 1118 conn = ftp_cached_connect(url, purl, flags); 1119 if (purl) 1120 fetchFreeURL(purl); 1121 if (conn == NULL) 1122 return (NULL); 1123 1124 /* change directory */ 1125 if (ftp_cwd(conn, url->doc) == -1) 1126 goto errsock; 1127 1128 /* stat file */ 1129 if (us && ftp_stat(conn, url->doc, us) == -1 1130 && fetchLastErrCode != FETCH_PROTO 1131 && fetchLastErrCode != FETCH_UNAVAIL) 1132 goto errsock; 1133 1134 /* just a stat */ 1135 if (strcmp(op, "STAT") == 0) { 1136 fetch_deref(conn); 1137 ftp_disconnect(conn); 1138 return (FILE *)1; /* bogus return value */ 1139 } 1140 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1141 oflag = O_WRONLY; 1142 else 1143 oflag = O_RDONLY; 1144 1145 /* initiate the transfer */ 1146 return (ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); 1147 1148 errsock: 1149 ftp_disconnect(conn); 1150 return (NULL); 1151 } 1152 1153 /* 1154 * Get and stat file 1155 */ 1156 FILE * 1157 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1158 { 1159 return (ftp_request(url, "RETR", us, ftp_get_proxy(url, flags), flags)); 1160 } 1161 1162 /* 1163 * Get file 1164 */ 1165 FILE * 1166 fetchGetFTP(struct url *url, const char *flags) 1167 { 1168 return (fetchXGetFTP(url, NULL, flags)); 1169 } 1170 1171 /* 1172 * Put file 1173 */ 1174 FILE * 1175 fetchPutFTP(struct url *url, const char *flags) 1176 { 1177 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 1178 ftp_get_proxy(url, flags), flags)); 1179 } 1180 1181 /* 1182 * Get file stats 1183 */ 1184 int 1185 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1186 { 1187 FILE *f; 1188 1189 f = ftp_request(url, "STAT", us, ftp_get_proxy(url, flags), flags); 1190 if (f == NULL) 1191 return (-1); 1192 /* 1193 * When op is "STAT", ftp_request() will return either NULL or 1194 * (FILE *)1, never a valid FILE *, so we mustn't fclose(f) before 1195 * returning, as it would cause a segfault. 1196 */ 1197 return (0); 1198 } 1199 1200 /* 1201 * List a directory 1202 */ 1203 struct url_ent * 1204 fetchListFTP(struct url *url __unused, const char *flags __unused) 1205 { 1206 warnx("fetchListFTP(): not implemented"); 1207 return (NULL); 1208 } 1209