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 (*p == '\0' && i < l - 1) 710 break; 711 } 712 if (i < l) { 713 e = FTP_PROTOCOL_ERROR; 714 goto ouch; 715 } 716 break; 717 case FTP_EPASSIVE_MODE: 718 for (p = ln + 3; *p && *p != '('; p++) 719 /* nothing */ ; 720 if (!*p) { 721 e = FTP_PROTOCOL_ERROR; 722 goto ouch; 723 } 724 ++p; 725 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 726 &port, &addr[3]) != 5 || 727 addr[0] != addr[1] || 728 addr[0] != addr[2] || addr[0] != addr[3]) { 729 e = FTP_PROTOCOL_ERROR; 730 goto ouch; 731 } 732 break; 733 } 734 735 /* seek to required offset */ 736 if (offset) 737 if (ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) 738 goto sysouch; 739 740 /* construct sockaddr for data socket */ 741 l = sizeof(sa); 742 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 743 goto sysouch; 744 if (sa.ss_family == AF_INET6) 745 unmappedaddr((struct sockaddr_in6 *)&sa); 746 switch (sa.ss_family) { 747 case AF_INET6: 748 sin6 = (struct sockaddr_in6 *)&sa; 749 if (e == FTP_EPASSIVE_MODE) 750 sin6->sin6_port = htons(port); 751 else { 752 memcpy(&sin6->sin6_addr, addr + 2, 16); 753 memcpy(&sin6->sin6_port, addr + 19, 2); 754 } 755 break; 756 case AF_INET: 757 sin4 = (struct sockaddr_in *)&sa; 758 if (e == FTP_EPASSIVE_MODE) 759 sin4->sin_port = htons(port); 760 else { 761 memcpy(&sin4->sin_addr, addr, 4); 762 memcpy(&sin4->sin_port, addr + 4, 2); 763 } 764 break; 765 default: 766 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 767 break; 768 } 769 770 /* connect to data port */ 771 if (verbose) 772 fetch_info("opening data connection"); 773 bindaddr = getenv("FETCH_BIND_ADDRESS"); 774 if (bindaddr != NULL && *bindaddr != '\0' && 775 (e = fetch_bind(sd, sa.ss_family, bindaddr)) != 0) 776 goto ouch; 777 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 778 goto sysouch; 779 780 /* make the server initiate the transfer */ 781 if (verbose) 782 fetch_info("initiating transfer"); 783 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 784 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 785 goto ouch; 786 787 } else { 788 u_int32_t a; 789 u_short p; 790 int arg, d; 791 char *ap; 792 char hname[INET6_ADDRSTRLEN]; 793 794 switch (sa.ss_family) { 795 case AF_INET6: 796 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 797 #ifdef IPV6_PORTRANGE 798 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 799 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 800 (char *)&arg, sizeof(arg)) == -1) 801 goto sysouch; 802 #endif 803 break; 804 case AF_INET: 805 ((struct sockaddr_in *)&sa)->sin_port = 0; 806 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 807 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 808 (char *)&arg, sizeof(arg)) == -1) 809 goto sysouch; 810 break; 811 } 812 if (verbose) 813 fetch_info("binding data socket"); 814 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 815 goto sysouch; 816 if (listen(sd, 1) == -1) 817 goto sysouch; 818 819 /* find what port we're on and tell the server */ 820 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 821 goto sysouch; 822 switch (sa.ss_family) { 823 case AF_INET: 824 sin4 = (struct sockaddr_in *)&sa; 825 a = ntohl(sin4->sin_addr.s_addr); 826 p = ntohs(sin4->sin_port); 827 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 828 (a >> 24) & 0xff, (a >> 16) & 0xff, 829 (a >> 8) & 0xff, a & 0xff, 830 (p >> 8) & 0xff, p & 0xff); 831 break; 832 case AF_INET6: 833 #define UC(b) (((int)b)&0xff) 834 e = -1; 835 sin6 = (struct sockaddr_in6 *)&sa; 836 sin6->sin6_scope_id = 0; 837 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 838 hname, sizeof(hname), 839 NULL, 0, NI_NUMERICHOST) == 0) { 840 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 841 htons(sin6->sin6_port)); 842 if (e == -1) 843 goto ouch; 844 } 845 if (e != FTP_OK) { 846 ap = (char *)&sin6->sin6_addr; 847 e = ftp_cmd(conn, 848 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 849 6, 16, 850 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 851 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 852 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 853 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 854 2, 855 (ntohs(sin6->sin6_port) >> 8) & 0xff, 856 ntohs(sin6->sin6_port) & 0xff); 857 } 858 break; 859 default: 860 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 861 goto ouch; 862 } 863 if (e != FTP_OK) 864 goto ouch; 865 866 /* seek to required offset */ 867 if (offset) 868 if (ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) 869 goto sysouch; 870 871 /* make the server initiate the transfer */ 872 if (verbose) 873 fetch_info("initiating transfer"); 874 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 875 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 876 goto ouch; 877 878 /* accept the incoming connection and go to town */ 879 if ((d = accept(sd, NULL, NULL)) == -1) 880 goto sysouch; 881 close(sd); 882 sd = d; 883 } 884 885 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 886 goto sysouch; 887 return (df); 888 889 sysouch: 890 fetch_syserr(); 891 if (sd >= 0) 892 close(sd); 893 return (NULL); 894 895 ouch: 896 if (e != -1) 897 ftp_seterr(e); 898 if (sd >= 0) 899 close(sd); 900 return (NULL); 901 } 902 903 /* 904 * Authenticate 905 */ 906 static int 907 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 908 { 909 const char *user, *pwd, *logname; 910 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 911 int e, len; 912 913 /* XXX FTP_AUTH, and maybe .netrc */ 914 915 /* send user name and password */ 916 if (url->user[0] == '\0') 917 fetch_netrc_auth(url); 918 user = url->user; 919 if (*user == '\0') 920 if ((user = getenv("FTP_LOGIN")) != NULL) 921 DEBUGF("FTP_LOGIN=%s\n", user); 922 if (user == NULL || *user == '\0') 923 user = FTP_ANONYMOUS_USER; 924 if (purl && url->port == fetch_default_port(url->scheme)) 925 e = ftp_cmd(conn, "USER %s@%s", user, url->host); 926 else if (purl) 927 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 928 else 929 e = ftp_cmd(conn, "USER %s", user); 930 931 /* did the server request a password? */ 932 if (e == FTP_NEED_PASSWORD) { 933 pwd = url->pwd; 934 if (*pwd == '\0') 935 if ((pwd = getenv("FTP_PASSWORD")) != NULL) 936 DEBUGF("FTP_PASSWORD=%s\n", pwd); 937 if (pwd == NULL || *pwd == '\0') { 938 if ((logname = getlogin()) == NULL) 939 logname = FTP_ANONYMOUS_USER; 940 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 941 len = 0; 942 else if (len > MAXLOGNAME) 943 len = MAXLOGNAME; 944 gethostname(pbuf + len, sizeof(pbuf) - len); 945 pwd = pbuf; 946 } 947 e = ftp_cmd(conn, "PASS %s", pwd); 948 } 949 950 return (e); 951 } 952 953 /* 954 * Log on to FTP server 955 */ 956 static conn_t * 957 ftp_connect(struct url *url, struct url *purl, const char *flags) 958 { 959 conn_t *conn; 960 int e, direct, verbose; 961 #ifdef INET6 962 int af = AF_UNSPEC; 963 #else 964 int af = AF_INET; 965 #endif 966 967 direct = CHECK_FLAG('d'); 968 verbose = CHECK_FLAG('v'); 969 if (CHECK_FLAG('4')) 970 af = AF_INET; 971 else if (CHECK_FLAG('6')) 972 af = AF_INET6; 973 974 if (direct) 975 purl = NULL; 976 977 /* check for proxy */ 978 if (purl) { 979 /* XXX proxy authentication! */ 980 conn = fetch_connect(purl->host, purl->port, af, verbose); 981 } else { 982 /* no proxy, go straight to target */ 983 conn = fetch_connect(url->host, url->port, af, verbose); 984 purl = NULL; 985 } 986 987 /* check connection */ 988 if (conn == NULL) 989 /* fetch_connect() has already set an error code */ 990 return (NULL); 991 992 /* expect welcome message */ 993 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 994 goto fouch; 995 996 /* authenticate */ 997 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 998 goto fouch; 999 1000 /* TODO: Request extended features supported, if any (RFC 3659). */ 1001 1002 /* done */ 1003 return (conn); 1004 1005 fouch: 1006 if (e != -1) 1007 ftp_seterr(e); 1008 fetch_close(conn); 1009 return (NULL); 1010 } 1011 1012 /* 1013 * Disconnect from server 1014 */ 1015 static void 1016 ftp_disconnect(conn_t *conn) 1017 { 1018 (void)ftp_cmd(conn, "QUIT"); 1019 if (conn == cached_connection && conn->ref == 1) 1020 cached_connection = NULL; 1021 fetch_close(conn); 1022 } 1023 1024 /* 1025 * Check if we're already connected 1026 */ 1027 static int 1028 ftp_isconnected(struct url *url) 1029 { 1030 return (cached_connection 1031 && (strcmp(url->host, cached_host.host) == 0) 1032 && (strcmp(url->user, cached_host.user) == 0) 1033 && (strcmp(url->pwd, cached_host.pwd) == 0) 1034 && (url->port == cached_host.port)); 1035 } 1036 1037 /* 1038 * Check the cache, reconnect if no luck 1039 */ 1040 static conn_t * 1041 ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1042 { 1043 conn_t *conn; 1044 int e; 1045 1046 /* set default port */ 1047 if (!url->port) 1048 url->port = fetch_default_port(url->scheme); 1049 1050 /* try to use previously cached connection */ 1051 if (ftp_isconnected(url)) { 1052 e = ftp_cmd(cached_connection, "NOOP"); 1053 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1054 return (fetch_ref(cached_connection)); 1055 } 1056 1057 /* connect to server */ 1058 if ((conn = ftp_connect(url, purl, flags)) == NULL) 1059 return (NULL); 1060 if (cached_connection) 1061 ftp_disconnect(cached_connection); 1062 cached_connection = fetch_ref(conn); 1063 memcpy(&cached_host, url, sizeof(*url)); 1064 return (conn); 1065 } 1066 1067 /* 1068 * Check the proxy settings 1069 */ 1070 static struct url * 1071 ftp_get_proxy(struct url * url, const char *flags) 1072 { 1073 struct url *purl; 1074 char *p; 1075 1076 if (flags != NULL && strchr(flags, 'd') != NULL) 1077 return (NULL); 1078 if (fetch_no_proxy_match(url->host)) 1079 return (NULL); 1080 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1081 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1082 *p && (purl = fetchParseURL(p)) != NULL) { 1083 if (!*purl->scheme) { 1084 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1085 strcpy(purl->scheme, SCHEME_FTP); 1086 else 1087 strcpy(purl->scheme, SCHEME_HTTP); 1088 } 1089 if (!purl->port) 1090 purl->port = fetch_default_proxy_port(purl->scheme); 1091 if (strcmp(purl->scheme, SCHEME_FTP) == 0 || 1092 strcmp(purl->scheme, SCHEME_HTTP) == 0) 1093 return (purl); 1094 fetchFreeURL(purl); 1095 } 1096 return (NULL); 1097 } 1098 1099 /* 1100 * Process an FTP request 1101 */ 1102 FILE * 1103 ftp_request(struct url *url, const char *op, struct url_stat *us, 1104 struct url *purl, const char *flags) 1105 { 1106 conn_t *conn; 1107 int oflag; 1108 1109 /* check if we should use HTTP instead */ 1110 if (purl && (strcmp(purl->scheme, SCHEME_HTTP) == 0 || 1111 strcmp(purl->scheme, SCHEME_HTTPS) == 0)) { 1112 if (strcmp(op, "STAT") == 0) 1113 return (http_request(url, "HEAD", us, purl, flags)); 1114 else if (strcmp(op, "RETR") == 0) 1115 return (http_request(url, "GET", us, purl, flags)); 1116 /* 1117 * Our HTTP code doesn't support PUT requests yet, so try 1118 * a direct connection. 1119 */ 1120 } 1121 1122 /* connect to server */ 1123 conn = ftp_cached_connect(url, purl, flags); 1124 if (purl) 1125 fetchFreeURL(purl); 1126 if (conn == NULL) 1127 return (NULL); 1128 1129 /* change directory */ 1130 if (ftp_cwd(conn, url->doc) == -1) 1131 goto errsock; 1132 1133 /* stat file */ 1134 if (us && ftp_stat(conn, url->doc, us) == -1 1135 && fetchLastErrCode != FETCH_PROTO 1136 && fetchLastErrCode != FETCH_UNAVAIL) 1137 goto errsock; 1138 1139 /* just a stat */ 1140 if (strcmp(op, "STAT") == 0) { 1141 --conn->ref; 1142 ftp_disconnect(conn); 1143 return (FILE *)1; /* bogus return value */ 1144 } 1145 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1146 oflag = O_WRONLY; 1147 else 1148 oflag = O_RDONLY; 1149 1150 /* initiate the transfer */ 1151 return (ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); 1152 1153 errsock: 1154 ftp_disconnect(conn); 1155 return (NULL); 1156 } 1157 1158 /* 1159 * Get and stat file 1160 */ 1161 FILE * 1162 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1163 { 1164 return (ftp_request(url, "RETR", us, ftp_get_proxy(url, flags), flags)); 1165 } 1166 1167 /* 1168 * Get file 1169 */ 1170 FILE * 1171 fetchGetFTP(struct url *url, const char *flags) 1172 { 1173 return (fetchXGetFTP(url, NULL, flags)); 1174 } 1175 1176 /* 1177 * Put file 1178 */ 1179 FILE * 1180 fetchPutFTP(struct url *url, const char *flags) 1181 { 1182 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 1183 ftp_get_proxy(url, flags), flags)); 1184 } 1185 1186 /* 1187 * Get file stats 1188 */ 1189 int 1190 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1191 { 1192 FILE *f; 1193 1194 f = ftp_request(url, "STAT", us, ftp_get_proxy(url, flags), flags); 1195 if (f == NULL) 1196 return (-1); 1197 /* 1198 * When op is "STAT", ftp_request() will return either NULL or 1199 * (FILE *)1, never a valid FILE *, so we mustn't fclose(f) before 1200 * returning, as it would cause a segfault. 1201 */ 1202 return (0); 1203 } 1204 1205 /* 1206 * List a directory 1207 */ 1208 struct url_ent * 1209 fetchListFTP(struct url *url __unused, const char *flags __unused) 1210 { 1211 warnx("fetchListFTP(): not implemented"); 1212 return (NULL); 1213 } 1214