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 if (fetch_getln(conn) == -1) { 146 fetch_syserr(); 147 return (-1); 148 } 149 if (isftpinfo(conn->buf)) { 150 while (conn->buflen && !isftpreply(conn->buf)) { 151 if (fetch_getln(conn) == -1) { 152 fetch_syserr(); 153 return (-1); 154 } 155 } 156 } 157 158 while (conn->buflen && 159 isspace((unsigned char)conn->buf[conn->buflen - 1])) 160 conn->buflen--; 161 conn->buf[conn->buflen] = '\0'; 162 163 if (!isftpreply(conn->buf)) { 164 ftp_seterr(FTP_PROTOCOL_ERROR); 165 return (-1); 166 } 167 168 conn->err = (conn->buf[0] - '0') * 100 169 + (conn->buf[1] - '0') * 10 170 + (conn->buf[2] - '0'); 171 172 return (conn->err); 173 } 174 175 /* 176 * Send a command and check reply 177 */ 178 static int 179 ftp_cmd(conn_t *conn, const char *fmt, ...) 180 { 181 va_list ap; 182 size_t len; 183 char *msg; 184 int r; 185 186 va_start(ap, fmt); 187 len = vasprintf(&msg, fmt, ap); 188 va_end(ap); 189 190 if (msg == NULL) { 191 errno = ENOMEM; 192 fetch_syserr(); 193 return (-1); 194 } 195 196 r = fetch_putln(conn, msg, len); 197 free(msg); 198 199 if (r == -1) { 200 fetch_syserr(); 201 return (-1); 202 } 203 204 return (ftp_chkerr(conn)); 205 } 206 207 /* 208 * Return a pointer to the filename part of a path 209 */ 210 static const char * 211 ftp_filename(const char *file, int *len, int *type) 212 { 213 const char *s; 214 215 if ((s = strrchr(file, '/')) == NULL) 216 s = file; 217 else 218 s = s + 1; 219 *len = strlen(s); 220 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 221 *type = s[*len - 1]; 222 *len -= 7; 223 } else { 224 *type = '\0'; 225 } 226 return (s); 227 } 228 229 /* 230 * Get current working directory from the reply to a CWD, PWD or CDUP 231 * command. 232 */ 233 static int 234 ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen) 235 { 236 char *src, *dst, *end; 237 int q; 238 239 if (conn->err != FTP_WORKING_DIRECTORY && 240 conn->err != FTP_FILE_ACTION_OK) 241 return (FTP_PROTOCOL_ERROR); 242 end = conn->buf + conn->buflen; 243 src = conn->buf + 4; 244 if (src >= end || *src++ != '"') 245 return (FTP_PROTOCOL_ERROR); 246 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { 247 if (!q && *src == '"') 248 q = 1; 249 else if (q && *src != '"') 250 break; 251 else if (q) 252 *dst++ = '"', q = 0; 253 else 254 *dst++ = *src; 255 } 256 if (!pwdlen) 257 return (FTP_PROTOCOL_ERROR); 258 *dst = '\0'; 259 #if 0 260 DEBUGF("pwd: [%s]\n", pwd); 261 #endif 262 return (FTP_OK); 263 } 264 265 /* 266 * Change working directory to the directory that contains the specified 267 * file. 268 */ 269 static int 270 ftp_cwd(conn_t *conn, const char *file) 271 { 272 const char *beg, *end; 273 char pwd[PATH_MAX]; 274 int e, i, len; 275 276 /* If no slashes in name, no need to change dirs. */ 277 if ((end = strrchr(file, '/')) == NULL) 278 return (0); 279 if ((e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 280 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 281 ftp_seterr(e); 282 return (-1); 283 } 284 for (;;) { 285 len = strlen(pwd); 286 287 /* Look for a common prefix between PWD and dir to fetch. */ 288 for (i = 0; i <= len && i <= end - file; ++i) 289 if (pwd[i] != file[i]) 290 break; 291 #if 0 292 DEBUGF("have: [%.*s|%s]\n", i, pwd, pwd + i); 293 DEBUGF("want: [%.*s|%s]\n", i, file, file + i); 294 #endif 295 /* Keep going up a dir until we have a matching prefix. */ 296 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) 297 break; 298 if ((e = ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || 299 (e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 300 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 301 ftp_seterr(e); 302 return (-1); 303 } 304 } 305 306 #ifdef FTP_COMBINE_CWDS 307 /* Skip leading slashes, even "////". */ 308 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) 309 /* nothing */ ; 310 311 /* If there is no trailing dir, we're already there. */ 312 if (beg >= end) 313 return (0); 314 315 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 316 e = ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); 317 if (e == FTP_FILE_ACTION_OK) 318 return (0); 319 #endif /* FTP_COMBINE_CWDS */ 320 321 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 322 for (beg = file + i; beg < end; beg = file + i + 1) { 323 while (*beg == '/') 324 ++beg, ++i; 325 for (++i; file + i < end && file[i] != '/'; ++i) 326 /* nothing */ ; 327 e = ftp_cmd(conn, "CWD %.*s", file + i - beg, beg); 328 if (e != FTP_FILE_ACTION_OK) { 329 ftp_seterr(e); 330 return (-1); 331 } 332 } 333 return (0); 334 } 335 336 /* 337 * Set transfer mode and data type 338 */ 339 static int 340 ftp_mode_type(conn_t *conn, int mode, int type) 341 { 342 int e; 343 344 switch (mode) { 345 case 0: 346 case 's': 347 mode = 'S'; 348 case 'S': 349 break; 350 default: 351 return (FTP_PROTOCOL_ERROR); 352 } 353 if ((e = ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { 354 if (mode == 'S') { 355 /* 356 * Stream mode is supposed to be the default - so 357 * much so that some servers not only do not 358 * support any other mode, but do not support the 359 * MODE command at all. 360 * 361 * If "MODE S" fails, it is unlikely that we 362 * previously succeeded in setting a different 363 * mode. Therefore, we simply hope that the 364 * server is already in the correct mode, and 365 * silently ignore the failure. 366 */ 367 } else { 368 return (e); 369 } 370 } 371 372 switch (type) { 373 case 0: 374 case 'i': 375 type = 'I'; 376 case 'I': 377 break; 378 case 'a': 379 type = 'A'; 380 case 'A': 381 break; 382 case 'd': 383 type = 'D'; 384 case 'D': 385 /* can't handle yet */ 386 default: 387 return (FTP_PROTOCOL_ERROR); 388 } 389 if ((e = ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) 390 return (e); 391 392 return (FTP_OK); 393 } 394 395 /* 396 * Request and parse file stats 397 */ 398 static int 399 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 400 { 401 char *ln; 402 const char *filename; 403 int filenamelen, type; 404 struct tm tm; 405 time_t t; 406 int e; 407 408 us->size = -1; 409 us->atime = us->mtime = 0; 410 411 filename = ftp_filename(file, &filenamelen, &type); 412 413 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 414 ftp_seterr(e); 415 return (-1); 416 } 417 418 e = ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); 419 if (e != FTP_FILE_STATUS) { 420 ftp_seterr(e); 421 return (-1); 422 } 423 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 424 /* nothing */ ; 425 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 426 us->size = us->size * 10 + *ln - '0'; 427 if (*ln && !isspace((unsigned char)*ln)) { 428 ftp_seterr(FTP_PROTOCOL_ERROR); 429 us->size = -1; 430 return (-1); 431 } 432 if (us->size == 0) 433 us->size = -1; 434 DEBUGF("size: [%lld]\n", (long long)us->size); 435 436 e = ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); 437 if (e != FTP_FILE_STATUS) { 438 ftp_seterr(e); 439 return (-1); 440 } 441 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 442 /* nothing */ ; 443 switch (strspn(ln, "0123456789")) { 444 case 14: 445 break; 446 case 15: 447 ln++; 448 ln[0] = '2'; 449 ln[1] = '0'; 450 break; 451 default: 452 ftp_seterr(FTP_PROTOCOL_ERROR); 453 return (-1); 454 } 455 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 456 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 457 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 458 ftp_seterr(FTP_PROTOCOL_ERROR); 459 return (-1); 460 } 461 tm.tm_mon--; 462 tm.tm_year -= 1900; 463 tm.tm_isdst = -1; 464 t = timegm(&tm); 465 if (t == (time_t)-1) 466 t = time(NULL); 467 us->mtime = t; 468 us->atime = t; 469 DEBUGF("last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", 470 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 471 tm.tm_hour, tm.tm_min, tm.tm_sec); 472 return (0); 473 } 474 475 /* 476 * I/O functions for FTP 477 */ 478 struct ftpio { 479 conn_t *cconn; /* Control connection */ 480 conn_t *dconn; /* Data connection */ 481 int dir; /* Direction */ 482 int eof; /* EOF reached */ 483 int err; /* Error code */ 484 }; 485 486 static int ftp_readfn(void *, char *, int); 487 static int ftp_writefn(void *, const char *, int); 488 static fpos_t ftp_seekfn(void *, fpos_t, int); 489 static int ftp_closefn(void *); 490 491 static int 492 ftp_readfn(void *v, char *buf, int len) 493 { 494 struct ftpio *io; 495 int r; 496 497 io = (struct ftpio *)v; 498 if (io == NULL) { 499 errno = EBADF; 500 return (-1); 501 } 502 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 503 errno = EBADF; 504 return (-1); 505 } 506 if (io->err) { 507 errno = io->err; 508 return (-1); 509 } 510 if (io->eof) 511 return (0); 512 r = fetch_read(io->dconn, buf, len); 513 if (r > 0) 514 return (r); 515 if (r == 0) { 516 io->eof = 1; 517 return (0); 518 } 519 if (errno != EINTR) 520 io->err = errno; 521 return (-1); 522 } 523 524 static int 525 ftp_writefn(void *v, const char *buf, int len) 526 { 527 struct ftpio *io; 528 int w; 529 530 io = (struct ftpio *)v; 531 if (io == NULL) { 532 errno = EBADF; 533 return (-1); 534 } 535 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 536 errno = EBADF; 537 return (-1); 538 } 539 if (io->err) { 540 errno = io->err; 541 return (-1); 542 } 543 w = fetch_write(io->dconn, buf, len); 544 if (w >= 0) 545 return (w); 546 if (errno != EINTR) 547 io->err = errno; 548 return (-1); 549 } 550 551 static fpos_t 552 ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 553 { 554 struct ftpio *io; 555 556 io = (struct ftpio *)v; 557 if (io == NULL) { 558 errno = EBADF; 559 return (-1); 560 } 561 errno = ESPIPE; 562 return (-1); 563 } 564 565 static int 566 ftp_closefn(void *v) 567 { 568 struct ftpio *io; 569 int r; 570 571 io = (struct ftpio *)v; 572 if (io == NULL) { 573 errno = EBADF; 574 return (-1); 575 } 576 if (io->dir == -1) 577 return (0); 578 if (io->cconn == NULL || io->dconn == NULL) { 579 errno = EBADF; 580 return (-1); 581 } 582 fetch_close(io->dconn); 583 io->dir = -1; 584 io->dconn = NULL; 585 DEBUGF("Waiting for final status\n"); 586 r = ftp_chkerr(io->cconn); 587 if (io->cconn == cached_connection && io->cconn->ref == 1) 588 cached_connection = NULL; 589 fetch_close(io->cconn); 590 free(io); 591 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 592 } 593 594 static FILE * 595 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 596 { 597 struct ftpio *io; 598 FILE *f; 599 600 if (cconn == NULL || dconn == NULL) 601 return (NULL); 602 if ((io = malloc(sizeof(*io))) == NULL) 603 return (NULL); 604 io->cconn = cconn; 605 io->dconn = dconn; 606 io->dir = mode; 607 io->eof = io->err = 0; 608 f = funopen(io, ftp_readfn, ftp_writefn, ftp_seekfn, ftp_closefn); 609 if (f == NULL) 610 free(io); 611 return (f); 612 } 613 614 /* 615 * Transfer file 616 */ 617 static FILE * 618 ftp_transfer(conn_t *conn, const char *oper, const char *file, 619 int mode, off_t offset, const char *flags) 620 { 621 struct sockaddr_storage sa; 622 struct sockaddr_in6 *sin6; 623 struct sockaddr_in *sin4; 624 const char *bindaddr; 625 const char *filename; 626 int filenamelen, type; 627 int low, pasv, verbose; 628 int e, sd = -1; 629 socklen_t l; 630 char *s; 631 FILE *df; 632 633 /* check flags */ 634 low = CHECK_FLAG('l'); 635 pasv = CHECK_FLAG('p') || !CHECK_FLAG('P'); 636 verbose = CHECK_FLAG('v'); 637 638 /* passive mode */ 639 if ((s = getenv("FTP_PASSIVE_MODE")) != NULL) 640 pasv = (strncasecmp(s, "no", 2) != 0); 641 642 /* isolate filename */ 643 filename = ftp_filename(file, &filenamelen, &type); 644 645 /* set transfer mode and data type */ 646 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 647 goto ouch; 648 649 /* find our own address, bind, and listen */ 650 l = sizeof(sa); 651 if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1) 652 goto sysouch; 653 if (sa.ss_family == AF_INET6) 654 unmappedaddr((struct sockaddr_in6 *)&sa); 655 656 /* open data socket */ 657 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 658 fetch_syserr(); 659 return (NULL); 660 } 661 662 if (pasv) { 663 u_char addr[64]; 664 char *ln, *p; 665 unsigned int i; 666 int port; 667 668 /* send PASV command */ 669 if (verbose) 670 fetch_info("setting passive mode"); 671 switch (sa.ss_family) { 672 case AF_INET: 673 if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 674 goto ouch; 675 break; 676 case AF_INET6: 677 if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 678 if (e == -1) 679 goto ouch; 680 if ((e = ftp_cmd(conn, "LPSV")) != 681 FTP_LPASSIVE_MODE) 682 goto ouch; 683 } 684 break; 685 default: 686 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 687 goto ouch; 688 } 689 690 /* 691 * Find address and port number. The reply to the PASV command 692 * is IMHO the one and only weak point in the FTP protocol. 693 */ 694 ln = conn->buf; 695 switch (e) { 696 case FTP_PASSIVE_MODE: 697 case FTP_LPASSIVE_MODE: 698 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 699 /* nothing */ ; 700 if (!*p) { 701 e = FTP_PROTOCOL_ERROR; 702 goto ouch; 703 } 704 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 705 for (i = 0; *p && i < l; i++, p++) { 706 addr[i] = strtol(p, &p, 10); 707 if (*p == '\0' && i < l - 1) 708 break; 709 } 710 if (i < l) { 711 e = FTP_PROTOCOL_ERROR; 712 goto ouch; 713 } 714 break; 715 case FTP_EPASSIVE_MODE: 716 for (p = ln + 3; *p && *p != '('; p++) 717 /* nothing */ ; 718 if (!*p) { 719 e = FTP_PROTOCOL_ERROR; 720 goto ouch; 721 } 722 ++p; 723 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 724 &port, &addr[3]) != 5 || 725 addr[0] != addr[1] || 726 addr[0] != addr[2] || addr[0] != addr[3]) { 727 e = FTP_PROTOCOL_ERROR; 728 goto ouch; 729 } 730 break; 731 } 732 733 /* seek to required offset */ 734 if (offset) 735 if (ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) 736 goto sysouch; 737 738 /* construct sockaddr for data socket */ 739 l = sizeof(sa); 740 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 741 goto sysouch; 742 if (sa.ss_family == AF_INET6) 743 unmappedaddr((struct sockaddr_in6 *)&sa); 744 switch (sa.ss_family) { 745 case AF_INET6: 746 sin6 = (struct sockaddr_in6 *)&sa; 747 if (e == FTP_EPASSIVE_MODE) 748 sin6->sin6_port = htons(port); 749 else { 750 memcpy(&sin6->sin6_addr, addr + 2, 16); 751 memcpy(&sin6->sin6_port, addr + 19, 2); 752 } 753 break; 754 case AF_INET: 755 sin4 = (struct sockaddr_in *)&sa; 756 if (e == FTP_EPASSIVE_MODE) 757 sin4->sin_port = htons(port); 758 else { 759 memcpy(&sin4->sin_addr, addr, 4); 760 memcpy(&sin4->sin_port, addr + 4, 2); 761 } 762 break; 763 default: 764 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 765 break; 766 } 767 768 /* connect to data port */ 769 if (verbose) 770 fetch_info("opening data connection"); 771 bindaddr = getenv("FETCH_BIND_ADDRESS"); 772 if (bindaddr != NULL && *bindaddr != '\0' && 773 (e = fetch_bind(sd, sa.ss_family, bindaddr)) != 0) 774 goto ouch; 775 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 776 goto sysouch; 777 778 /* make the server initiate the transfer */ 779 if (verbose) 780 fetch_info("initiating transfer"); 781 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 782 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 783 goto ouch; 784 785 } else { 786 u_int32_t a; 787 u_short p; 788 int arg, d; 789 char *ap; 790 char hname[INET6_ADDRSTRLEN]; 791 792 switch (sa.ss_family) { 793 case AF_INET6: 794 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 795 #ifdef IPV6_PORTRANGE 796 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 797 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 798 (char *)&arg, sizeof(arg)) == -1) 799 goto sysouch; 800 #endif 801 break; 802 case AF_INET: 803 ((struct sockaddr_in *)&sa)->sin_port = 0; 804 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 805 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 806 (char *)&arg, sizeof(arg)) == -1) 807 goto sysouch; 808 break; 809 } 810 if (verbose) 811 fetch_info("binding data socket"); 812 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 813 goto sysouch; 814 if (listen(sd, 1) == -1) 815 goto sysouch; 816 817 /* find what port we're on and tell the server */ 818 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 819 goto sysouch; 820 switch (sa.ss_family) { 821 case AF_INET: 822 sin4 = (struct sockaddr_in *)&sa; 823 a = ntohl(sin4->sin_addr.s_addr); 824 p = ntohs(sin4->sin_port); 825 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 826 (a >> 24) & 0xff, (a >> 16) & 0xff, 827 (a >> 8) & 0xff, a & 0xff, 828 (p >> 8) & 0xff, p & 0xff); 829 break; 830 case AF_INET6: 831 #define UC(b) (((int)b)&0xff) 832 e = -1; 833 sin6 = (struct sockaddr_in6 *)&sa; 834 sin6->sin6_scope_id = 0; 835 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 836 hname, sizeof(hname), 837 NULL, 0, NI_NUMERICHOST) == 0) { 838 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 839 htons(sin6->sin6_port)); 840 if (e == -1) 841 goto ouch; 842 } 843 if (e != FTP_OK) { 844 ap = (char *)&sin6->sin6_addr; 845 e = ftp_cmd(conn, 846 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 847 6, 16, 848 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 849 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 850 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 851 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 852 2, 853 (ntohs(sin6->sin6_port) >> 8) & 0xff, 854 ntohs(sin6->sin6_port) & 0xff); 855 } 856 break; 857 default: 858 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 859 goto ouch; 860 } 861 if (e != FTP_OK) 862 goto ouch; 863 864 /* seek to required offset */ 865 if (offset) 866 if (ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) 867 goto sysouch; 868 869 /* make the server initiate the transfer */ 870 if (verbose) 871 fetch_info("initiating transfer"); 872 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 873 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 874 goto ouch; 875 876 /* accept the incoming connection and go to town */ 877 if ((d = accept(sd, NULL, NULL)) == -1) 878 goto sysouch; 879 close(sd); 880 sd = d; 881 } 882 883 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 884 goto sysouch; 885 return (df); 886 887 sysouch: 888 fetch_syserr(); 889 if (sd >= 0) 890 close(sd); 891 return (NULL); 892 893 ouch: 894 if (e != -1) 895 ftp_seterr(e); 896 if (sd >= 0) 897 close(sd); 898 return (NULL); 899 } 900 901 /* 902 * Authenticate 903 */ 904 static int 905 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 906 { 907 const char *user, *pwd, *logname; 908 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 909 int e, len; 910 911 /* XXX FTP_AUTH, and maybe .netrc */ 912 913 /* send user name and password */ 914 if (url->user[0] == '\0') 915 fetch_netrc_auth(url); 916 user = url->user; 917 if (*user == '\0') 918 if ((user = getenv("FTP_LOGIN")) != NULL) 919 DEBUGF("FTP_LOGIN=%s\n", user); 920 if (user == NULL || *user == '\0') 921 user = FTP_ANONYMOUS_USER; 922 if (purl && url->port == fetch_default_port(url->scheme)) 923 e = ftp_cmd(conn, "USER %s@%s", user, url->host); 924 else if (purl) 925 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 926 else 927 e = ftp_cmd(conn, "USER %s", user); 928 929 /* did the server request a password? */ 930 if (e == FTP_NEED_PASSWORD) { 931 pwd = url->pwd; 932 if (*pwd == '\0') 933 if ((pwd = getenv("FTP_PASSWORD")) != NULL) 934 DEBUGF("FTP_PASSWORD=%s\n", pwd); 935 if (pwd == NULL || *pwd == '\0') { 936 if ((logname = getlogin()) == NULL) 937 logname = FTP_ANONYMOUS_USER; 938 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 939 len = 0; 940 else if (len > MAXLOGNAME) 941 len = MAXLOGNAME; 942 gethostname(pbuf + len, sizeof(pbuf) - len); 943 pwd = pbuf; 944 } 945 e = ftp_cmd(conn, "PASS %s", pwd); 946 } 947 948 return (e); 949 } 950 951 /* 952 * Log on to FTP server 953 */ 954 static conn_t * 955 ftp_connect(struct url *url, struct url *purl, const char *flags) 956 { 957 conn_t *conn; 958 int e, direct, verbose; 959 #ifdef INET6 960 int af = AF_UNSPEC; 961 #else 962 int af = AF_INET; 963 #endif 964 965 direct = CHECK_FLAG('d'); 966 verbose = CHECK_FLAG('v'); 967 if (CHECK_FLAG('4')) 968 af = AF_INET; 969 else if (CHECK_FLAG('6')) 970 af = AF_INET6; 971 972 if (direct) 973 purl = NULL; 974 975 /* check for proxy */ 976 if (purl) { 977 /* XXX proxy authentication! */ 978 conn = fetch_connect(purl->host, purl->port, af, verbose); 979 } else { 980 /* no proxy, go straight to target */ 981 conn = fetch_connect(url->host, url->port, af, verbose); 982 purl = NULL; 983 } 984 985 /* check connection */ 986 if (conn == NULL) 987 /* fetch_connect() has already set an error code */ 988 return (NULL); 989 990 /* expect welcome message */ 991 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 992 goto fouch; 993 994 /* authenticate */ 995 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 996 goto fouch; 997 998 /* TODO: Request extended features supported, if any (RFC 3659). */ 999 1000 /* done */ 1001 return (conn); 1002 1003 fouch: 1004 if (e != -1) 1005 ftp_seterr(e); 1006 fetch_close(conn); 1007 return (NULL); 1008 } 1009 1010 /* 1011 * Disconnect from server 1012 */ 1013 static void 1014 ftp_disconnect(conn_t *conn) 1015 { 1016 (void)ftp_cmd(conn, "QUIT"); 1017 if (conn == cached_connection && conn->ref == 1) 1018 cached_connection = NULL; 1019 fetch_close(conn); 1020 } 1021 1022 /* 1023 * Check if we're already connected 1024 */ 1025 static int 1026 ftp_isconnected(struct url *url) 1027 { 1028 return (cached_connection 1029 && (strcmp(url->host, cached_host.host) == 0) 1030 && (strcmp(url->user, cached_host.user) == 0) 1031 && (strcmp(url->pwd, cached_host.pwd) == 0) 1032 && (url->port == cached_host.port)); 1033 } 1034 1035 /* 1036 * Check the cache, reconnect if no luck 1037 */ 1038 static conn_t * 1039 ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1040 { 1041 conn_t *conn; 1042 int e; 1043 1044 /* set default port */ 1045 if (!url->port) 1046 url->port = fetch_default_port(url->scheme); 1047 1048 /* try to use previously cached connection */ 1049 if (ftp_isconnected(url)) { 1050 e = ftp_cmd(cached_connection, "NOOP"); 1051 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1052 return (fetch_ref(cached_connection)); 1053 } 1054 1055 /* connect to server */ 1056 if ((conn = ftp_connect(url, purl, flags)) == NULL) 1057 return (NULL); 1058 if (cached_connection) 1059 ftp_disconnect(cached_connection); 1060 cached_connection = fetch_ref(conn); 1061 memcpy(&cached_host, url, sizeof(*url)); 1062 return (conn); 1063 } 1064 1065 /* 1066 * Check the proxy settings 1067 */ 1068 static struct url * 1069 ftp_get_proxy(struct url * url, const char *flags) 1070 { 1071 struct url *purl; 1072 char *p; 1073 1074 if (flags != NULL && strchr(flags, 'd') != NULL) 1075 return (NULL); 1076 if (fetch_no_proxy_match(url->host)) 1077 return (NULL); 1078 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1079 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1080 *p && (purl = fetchParseURL(p)) != NULL) { 1081 if (!*purl->scheme) { 1082 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1083 strcpy(purl->scheme, SCHEME_FTP); 1084 else 1085 strcpy(purl->scheme, SCHEME_HTTP); 1086 } 1087 if (!purl->port) 1088 purl->port = fetch_default_proxy_port(purl->scheme); 1089 if (strcmp(purl->scheme, SCHEME_FTP) == 0 || 1090 strcmp(purl->scheme, SCHEME_HTTP) == 0) 1091 return (purl); 1092 fetchFreeURL(purl); 1093 } 1094 return (NULL); 1095 } 1096 1097 /* 1098 * Process an FTP request 1099 */ 1100 FILE * 1101 ftp_request(struct url *url, const char *op, struct url_stat *us, 1102 struct url *purl, const char *flags) 1103 { 1104 conn_t *conn; 1105 int oflag; 1106 1107 /* check if we should use HTTP instead */ 1108 if (purl && (strcmp(purl->scheme, SCHEME_HTTP) == 0 || 1109 strcmp(purl->scheme, SCHEME_HTTPS) == 0)) { 1110 if (strcmp(op, "STAT") == 0) 1111 return (http_request(url, "HEAD", us, purl, flags)); 1112 else if (strcmp(op, "RETR") == 0) 1113 return (http_request(url, "GET", us, purl, flags)); 1114 /* 1115 * Our HTTP code doesn't support PUT requests yet, so try 1116 * a direct connection. 1117 */ 1118 } 1119 1120 /* connect to server */ 1121 conn = ftp_cached_connect(url, purl, flags); 1122 if (purl) 1123 fetchFreeURL(purl); 1124 if (conn == NULL) 1125 return (NULL); 1126 1127 /* change directory */ 1128 if (ftp_cwd(conn, url->doc) == -1) 1129 goto errsock; 1130 1131 /* stat file */ 1132 if (us && ftp_stat(conn, url->doc, us) == -1 1133 && fetchLastErrCode != FETCH_PROTO 1134 && fetchLastErrCode != FETCH_UNAVAIL) 1135 goto errsock; 1136 1137 /* just a stat */ 1138 if (strcmp(op, "STAT") == 0) { 1139 --conn->ref; 1140 ftp_disconnect(conn); 1141 return (FILE *)1; /* bogus return value */ 1142 } 1143 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1144 oflag = O_WRONLY; 1145 else 1146 oflag = O_RDONLY; 1147 1148 /* initiate the transfer */ 1149 return (ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); 1150 1151 errsock: 1152 ftp_disconnect(conn); 1153 return (NULL); 1154 } 1155 1156 /* 1157 * Get and stat file 1158 */ 1159 FILE * 1160 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1161 { 1162 return (ftp_request(url, "RETR", us, ftp_get_proxy(url, flags), flags)); 1163 } 1164 1165 /* 1166 * Get file 1167 */ 1168 FILE * 1169 fetchGetFTP(struct url *url, const char *flags) 1170 { 1171 return (fetchXGetFTP(url, NULL, flags)); 1172 } 1173 1174 /* 1175 * Put file 1176 */ 1177 FILE * 1178 fetchPutFTP(struct url *url, const char *flags) 1179 { 1180 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 1181 ftp_get_proxy(url, flags), flags)); 1182 } 1183 1184 /* 1185 * Get file stats 1186 */ 1187 int 1188 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1189 { 1190 FILE *f; 1191 1192 f = ftp_request(url, "STAT", us, ftp_get_proxy(url, flags), flags); 1193 if (f == NULL) 1194 return (-1); 1195 /* 1196 * When op is "STAT", ftp_request() will return either NULL or 1197 * (FILE *)1, never a valid FILE *, so we mustn't fclose(f) before 1198 * returning, as it would cause a segfault. 1199 */ 1200 return (0); 1201 } 1202 1203 /* 1204 * List a directory 1205 */ 1206 struct url_ent * 1207 fetchListFTP(struct url *url __unused, const char *flags __unused) 1208 { 1209 warnx("fetchListFTP(): not implemented"); 1210 return (NULL); 1211 } 1212