1 /*- 2 * Copyright (c) 1998-2011 Dag-Erling Smørgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Portions of this code were taken from or based on ftpio.c: 31 * 32 * ---------------------------------------------------------------------------- 33 * "THE BEER-WARE LICENSE" (Revision 42): 34 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you 35 * can do whatever you want with this stuff. If we meet some day, and you think 36 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 37 * ---------------------------------------------------------------------------- 38 * 39 * Major Changelog: 40 * 41 * Dag-Erling Smørgrav 42 * 9 Jun 1998 43 * 44 * Incorporated into libfetch 45 * 46 * Jordan K. Hubbard 47 * 17 Jan 1996 48 * 49 * Turned inside out. Now returns xfers as new file ids, not as a special 50 * `state' of FTP_t 51 * 52 * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $ 53 * 54 */ 55 56 #include <sys/param.h> 57 #include <sys/socket.h> 58 #include <netinet/in.h> 59 60 #include <ctype.h> 61 #include <err.h> 62 #include <errno.h> 63 #include <fcntl.h> 64 #include <netdb.h> 65 #include <stdarg.h> 66 #include <stdint.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <time.h> 71 #include <unistd.h> 72 73 #include "fetch.h" 74 #include "common.h" 75 #include "ftperr.h" 76 77 #define FTP_ANONYMOUS_USER "anonymous" 78 79 #define FTP_CONNECTION_ALREADY_OPEN 125 80 #define FTP_OPEN_DATA_CONNECTION 150 81 #define FTP_OK 200 82 #define FTP_FILE_STATUS 213 83 #define FTP_SERVICE_READY 220 84 #define FTP_TRANSFER_COMPLETE 226 85 #define FTP_PASSIVE_MODE 227 86 #define FTP_LPASSIVE_MODE 228 87 #define FTP_EPASSIVE_MODE 229 88 #define FTP_LOGGED_IN 230 89 #define FTP_FILE_ACTION_OK 250 90 #define FTP_DIRECTORY_CREATED 257 /* multiple meanings */ 91 #define FTP_FILE_CREATED 257 /* multiple meanings */ 92 #define FTP_WORKING_DIRECTORY 257 /* multiple meanings */ 93 #define FTP_NEED_PASSWORD 331 94 #define FTP_NEED_ACCOUNT 332 95 #define FTP_FILE_OK 350 96 #define FTP_SYNTAX_ERROR 500 97 #define FTP_PROTOCOL_ERROR 999 98 99 static int ftp_cmd(conn_t *, const char *, ...) __printflike(2, 3); 100 static struct url cached_host; 101 static conn_t *cached_connection; 102 103 #define isftpreply(foo) \ 104 (isdigit((unsigned char)foo[0]) && \ 105 isdigit((unsigned char)foo[1]) && \ 106 isdigit((unsigned char)foo[2]) && \ 107 (foo[3] == ' ' || foo[3] == '\0')) 108 #define isftpinfo(foo) \ 109 (isdigit((unsigned char)foo[0]) && \ 110 isdigit((unsigned char)foo[1]) && \ 111 isdigit((unsigned char)foo[2]) && \ 112 foo[3] == '-') 113 114 /* 115 * Translate IPv4 mapped IPv6 address to IPv4 address 116 */ 117 static void 118 unmappedaddr(struct sockaddr_in6 *sin6) 119 { 120 struct sockaddr_in *sin4; 121 u_int32_t addr; 122 int port; 123 124 if (sin6->sin6_family != AF_INET6 || 125 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 126 return; 127 sin4 = (struct sockaddr_in *)sin6; 128 addr = *(u_int32_t *)(uintptr_t)&sin6->sin6_addr.s6_addr[12]; 129 port = sin6->sin6_port; 130 memset(sin4, 0, sizeof(struct sockaddr_in)); 131 sin4->sin_addr.s_addr = addr; 132 sin4->sin_port = port; 133 sin4->sin_family = AF_INET; 134 sin4->sin_len = sizeof(struct sockaddr_in); 135 } 136 137 /* 138 * Get server response 139 */ 140 static int 141 ftp_chkerr(conn_t *conn) 142 { 143 if (fetch_getln(conn) == -1) { 144 fetch_syserr(); 145 return (-1); 146 } 147 if (isftpinfo(conn->buf)) { 148 while (conn->buflen && !isftpreply(conn->buf)) { 149 if (fetch_getln(conn) == -1) { 150 fetch_syserr(); 151 return (-1); 152 } 153 } 154 } 155 156 while (conn->buflen && 157 isspace((unsigned char)conn->buf[conn->buflen - 1])) 158 conn->buflen--; 159 conn->buf[conn->buflen] = '\0'; 160 161 if (!isftpreply(conn->buf)) { 162 ftp_seterr(FTP_PROTOCOL_ERROR); 163 return (-1); 164 } 165 166 conn->err = (conn->buf[0] - '0') * 100 167 + (conn->buf[1] - '0') * 10 168 + (conn->buf[2] - '0'); 169 170 return (conn->err); 171 } 172 173 /* 174 * Send a command and check reply 175 */ 176 static int 177 ftp_cmd(conn_t *conn, const char *fmt, ...) 178 { 179 va_list ap; 180 size_t len; 181 char *msg; 182 int r; 183 184 va_start(ap, fmt); 185 len = vasprintf(&msg, fmt, ap); 186 va_end(ap); 187 188 if (msg == NULL) { 189 errno = ENOMEM; 190 fetch_syserr(); 191 return (-1); 192 } 193 194 r = fetch_putln(conn, msg, len); 195 free(msg); 196 197 if (r == -1) { 198 fetch_syserr(); 199 return (-1); 200 } 201 202 return (ftp_chkerr(conn)); 203 } 204 205 /* 206 * Return a pointer to the filename part of a path 207 */ 208 static const char * 209 ftp_filename(const char *file, int *len, int *type) 210 { 211 const char *s; 212 213 if ((s = strrchr(file, '/')) == NULL) 214 s = file; 215 else 216 s = s + 1; 217 *len = strlen(s); 218 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { 219 *type = s[*len - 1]; 220 *len -= 7; 221 } else { 222 *type = '\0'; 223 } 224 return (s); 225 } 226 227 /* 228 * Get current working directory from the reply to a CWD, PWD or CDUP 229 * command. 230 */ 231 static int 232 ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen) 233 { 234 char *src, *dst, *end; 235 int q; 236 237 if (conn->err != FTP_WORKING_DIRECTORY && 238 conn->err != FTP_FILE_ACTION_OK) 239 return (FTP_PROTOCOL_ERROR); 240 end = conn->buf + conn->buflen; 241 src = conn->buf + 4; 242 if (src >= end || *src++ != '"') 243 return (FTP_PROTOCOL_ERROR); 244 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { 245 if (!q && *src == '"') 246 q = 1; 247 else if (q && *src != '"') 248 break; 249 else if (q) 250 *dst++ = '"', q = 0; 251 else 252 *dst++ = *src; 253 } 254 if (!pwdlen) 255 return (FTP_PROTOCOL_ERROR); 256 *dst = '\0'; 257 #if 0 258 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); 259 #endif 260 return (FTP_OK); 261 } 262 263 /* 264 * Change working directory to the directory that contains the specified 265 * file. 266 */ 267 static int 268 ftp_cwd(conn_t *conn, const char *file) 269 { 270 const char *beg, *end; 271 char pwd[PATH_MAX]; 272 int e, i, len; 273 274 /* If no slashes in name, no need to change dirs. */ 275 if ((end = strrchr(file, '/')) == NULL) 276 return (0); 277 if ((e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 278 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 279 ftp_seterr(e); 280 return (-1); 281 } 282 for (;;) { 283 len = strlen(pwd); 284 285 /* Look for a common prefix between PWD and dir to fetch. */ 286 for (i = 0; i <= len && i <= end - file; ++i) 287 if (pwd[i] != file[i]) 288 break; 289 #if 0 290 DEBUG(fprintf(stderr, "have: [%.*s|%s]\n", i, pwd, pwd + i)); 291 DEBUG(fprintf(stderr, "want: [%.*s|%s]\n", i, file, file + i)); 292 #endif 293 /* Keep going up a dir until we have a matching prefix. */ 294 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) 295 break; 296 if ((e = ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || 297 (e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || 298 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { 299 ftp_seterr(e); 300 return (-1); 301 } 302 } 303 304 #ifdef FTP_COMBINE_CWDS 305 /* Skip leading slashes, even "////". */ 306 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) 307 /* nothing */ ; 308 309 /* If there is no trailing dir, we're already there. */ 310 if (beg >= end) 311 return (0); 312 313 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ 314 e = ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); 315 if (e == FTP_FILE_ACTION_OK) 316 return (0); 317 #endif /* FTP_COMBINE_CWDS */ 318 319 /* That didn't work so go back to legacy behavior (multiple CWDs). */ 320 for (beg = file + i; beg < end; beg = file + i + 1) { 321 while (*beg == '/') 322 ++beg, ++i; 323 for (++i; file + i < end && file[i] != '/'; ++i) 324 /* nothing */ ; 325 e = ftp_cmd(conn, "CWD %.*s", (int)(file + i - beg), beg); 326 if (e != FTP_FILE_ACTION_OK) { 327 ftp_seterr(e); 328 return (-1); 329 } 330 } 331 return (0); 332 } 333 334 /* 335 * Set transfer mode and data type 336 */ 337 static int 338 ftp_mode_type(conn_t *conn, int mode, int type) 339 { 340 int e; 341 342 switch (mode) { 343 case 0: 344 case 's': 345 mode = 'S'; 346 case 'S': 347 break; 348 default: 349 return (FTP_PROTOCOL_ERROR); 350 } 351 if ((e = ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { 352 if (mode == 'S') { 353 /* 354 * Stream mode is supposed to be the default - so 355 * much so that some servers not only do not 356 * support any other mode, but do not support the 357 * MODE command at all. 358 * 359 * If "MODE S" fails, it is unlikely that we 360 * previously succeeded in setting a different 361 * mode. Therefore, we simply hope that the 362 * server is already in the correct mode, and 363 * silently ignore the failure. 364 */ 365 } else { 366 return (e); 367 } 368 } 369 370 switch (type) { 371 case 0: 372 case 'i': 373 type = 'I'; 374 case 'I': 375 break; 376 case 'a': 377 type = 'A'; 378 case 'A': 379 break; 380 case 'd': 381 type = 'D'; 382 case 'D': 383 /* can't handle yet */ 384 default: 385 return (FTP_PROTOCOL_ERROR); 386 } 387 if ((e = ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) 388 return (e); 389 390 return (FTP_OK); 391 } 392 393 /* 394 * Request and parse file stats 395 */ 396 static int 397 ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 398 { 399 char *ln; 400 const char *filename; 401 int filenamelen, type; 402 struct tm tm; 403 time_t t; 404 int e; 405 406 us->size = -1; 407 us->atime = us->mtime = 0; 408 409 filename = ftp_filename(file, &filenamelen, &type); 410 411 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { 412 ftp_seterr(e); 413 return (-1); 414 } 415 416 e = ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); 417 if (e != FTP_FILE_STATUS) { 418 ftp_seterr(e); 419 return (-1); 420 } 421 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 422 /* nothing */ ; 423 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) 424 us->size = us->size * 10 + *ln - '0'; 425 if (*ln && !isspace((unsigned char)*ln)) { 426 ftp_seterr(FTP_PROTOCOL_ERROR); 427 us->size = -1; 428 return (-1); 429 } 430 if (us->size == 0) 431 us->size = -1; 432 DEBUG(fprintf(stderr, "size: [%lld]\n", (long long)us->size)); 433 434 e = ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); 435 if (e != FTP_FILE_STATUS) { 436 ftp_seterr(e); 437 return (-1); 438 } 439 for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) 440 /* nothing */ ; 441 switch (strspn(ln, "0123456789")) { 442 case 14: 443 break; 444 case 15: 445 ln++; 446 ln[0] = '2'; 447 ln[1] = '0'; 448 break; 449 default: 450 ftp_seterr(FTP_PROTOCOL_ERROR); 451 return (-1); 452 } 453 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 454 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 455 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 456 ftp_seterr(FTP_PROTOCOL_ERROR); 457 return (-1); 458 } 459 tm.tm_mon--; 460 tm.tm_year -= 1900; 461 tm.tm_isdst = -1; 462 t = timegm(&tm); 463 if (t == (time_t)-1) 464 t = time(NULL); 465 us->mtime = t; 466 us->atime = t; 467 DEBUG(fprintf(stderr, 468 "last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", 469 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 470 tm.tm_hour, tm.tm_min, tm.tm_sec)); 471 return (0); 472 } 473 474 /* 475 * I/O functions for FTP 476 */ 477 struct ftpio { 478 conn_t *cconn; /* Control connection */ 479 conn_t *dconn; /* Data connection */ 480 int dir; /* Direction */ 481 int eof; /* EOF reached */ 482 int err; /* Error code */ 483 }; 484 485 static int ftp_readfn(void *, char *, int); 486 static int ftp_writefn(void *, const char *, int); 487 static fpos_t ftp_seekfn(void *, fpos_t, int); 488 static int ftp_closefn(void *); 489 490 static int 491 ftp_readfn(void *v, char *buf, int len) 492 { 493 struct ftpio *io; 494 int r; 495 496 io = (struct ftpio *)v; 497 if (io == NULL) { 498 errno = EBADF; 499 return (-1); 500 } 501 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { 502 errno = EBADF; 503 return (-1); 504 } 505 if (io->err) { 506 errno = io->err; 507 return (-1); 508 } 509 if (io->eof) 510 return (0); 511 r = fetch_read(io->dconn, buf, len); 512 if (r > 0) 513 return (r); 514 if (r == 0) { 515 io->eof = 1; 516 return (0); 517 } 518 if (errno != EINTR) 519 io->err = errno; 520 return (-1); 521 } 522 523 static int 524 ftp_writefn(void *v, const char *buf, int len) 525 { 526 struct ftpio *io; 527 int w; 528 529 io = (struct ftpio *)v; 530 if (io == NULL) { 531 errno = EBADF; 532 return (-1); 533 } 534 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { 535 errno = EBADF; 536 return (-1); 537 } 538 if (io->err) { 539 errno = io->err; 540 return (-1); 541 } 542 w = fetch_write(io->dconn, buf, len); 543 if (w >= 0) 544 return (w); 545 if (errno != EINTR) 546 io->err = errno; 547 return (-1); 548 } 549 550 static fpos_t 551 ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 552 { 553 struct ftpio *io; 554 555 io = (struct ftpio *)v; 556 if (io == NULL) { 557 errno = EBADF; 558 return (-1); 559 } 560 errno = ESPIPE; 561 return (-1); 562 } 563 564 static int 565 ftp_closefn(void *v) 566 { 567 struct ftpio *io; 568 int r; 569 570 io = (struct ftpio *)v; 571 if (io == NULL) { 572 errno = EBADF; 573 return (-1); 574 } 575 if (io->dir == -1) 576 return (0); 577 if (io->cconn == NULL || io->dconn == NULL) { 578 errno = EBADF; 579 return (-1); 580 } 581 fetch_close(io->dconn); 582 io->dir = -1; 583 io->dconn = NULL; 584 DEBUG(fprintf(stderr, "Waiting for final status\n")); 585 r = ftp_chkerr(io->cconn); 586 if (io->cconn == cached_connection && io->cconn->ref == 1) 587 cached_connection = NULL; 588 fetch_close(io->cconn); 589 free(io); 590 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 591 } 592 593 static FILE * 594 ftp_setup(conn_t *cconn, conn_t *dconn, int mode) 595 { 596 struct ftpio *io; 597 FILE *f; 598 599 if (cconn == NULL || dconn == NULL) 600 return (NULL); 601 if ((io = malloc(sizeof(*io))) == NULL) 602 return (NULL); 603 io->cconn = cconn; 604 io->dconn = dconn; 605 io->dir = mode; 606 io->eof = io->err = 0; 607 f = funopen(io, ftp_readfn, ftp_writefn, ftp_seekfn, ftp_closefn); 608 if (f == NULL) 609 free(io); 610 return (f); 611 } 612 613 /* 614 * Transfer file 615 */ 616 static FILE * 617 ftp_transfer(conn_t *conn, const char *oper, const char *file, 618 int mode, off_t offset, const char *flags) 619 { 620 struct sockaddr_storage sa; 621 struct sockaddr_in6 *sin6; 622 struct sockaddr_in *sin4; 623 const char *bindaddr; 624 const char *filename; 625 int filenamelen, type; 626 int low, pasv, verbose; 627 int e, sd = -1; 628 socklen_t l; 629 char *s; 630 FILE *df; 631 632 /* check flags */ 633 low = CHECK_FLAG('l'); 634 pasv = CHECK_FLAG('p') || !CHECK_FLAG('P'); 635 verbose = CHECK_FLAG('v'); 636 637 /* passive mode */ 638 if ((s = getenv("FTP_PASSIVE_MODE")) != NULL) 639 pasv = (strncasecmp(s, "no", 2) != 0); 640 641 /* isolate filename */ 642 filename = ftp_filename(file, &filenamelen, &type); 643 644 /* set transfer mode and data type */ 645 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) 646 goto ouch; 647 648 /* find our own address, bind, and listen */ 649 l = sizeof(sa); 650 if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1) 651 goto sysouch; 652 if (sa.ss_family == AF_INET6) 653 unmappedaddr((struct sockaddr_in6 *)&sa); 654 655 /* open data socket */ 656 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 657 fetch_syserr(); 658 return (NULL); 659 } 660 661 if (pasv) { 662 u_char addr[64]; 663 char *ln, *p; 664 unsigned int i; 665 int port; 666 667 /* send PASV command */ 668 if (verbose) 669 fetch_info("setting passive mode"); 670 switch (sa.ss_family) { 671 case AF_INET: 672 if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 673 goto ouch; 674 break; 675 case AF_INET6: 676 if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 677 if (e == -1) 678 goto ouch; 679 if ((e = ftp_cmd(conn, "LPSV")) != 680 FTP_LPASSIVE_MODE) 681 goto ouch; 682 } 683 break; 684 default: 685 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 686 goto ouch; 687 } 688 689 /* 690 * Find address and port number. The reply to the PASV command 691 * is IMHO the one and only weak point in the FTP protocol. 692 */ 693 ln = conn->buf; 694 switch (e) { 695 case FTP_PASSIVE_MODE: 696 case FTP_LPASSIVE_MODE: 697 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) 698 /* nothing */ ; 699 if (!*p) { 700 e = FTP_PROTOCOL_ERROR; 701 goto ouch; 702 } 703 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 704 for (i = 0; *p && i < l; i++, p++) 705 addr[i] = strtol(p, &p, 10); 706 if (i < l) { 707 e = FTP_PROTOCOL_ERROR; 708 goto ouch; 709 } 710 break; 711 case FTP_EPASSIVE_MODE: 712 for (p = ln + 3; *p && *p != '('; p++) 713 /* nothing */ ; 714 if (!*p) { 715 e = FTP_PROTOCOL_ERROR; 716 goto ouch; 717 } 718 ++p; 719 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 720 &port, &addr[3]) != 5 || 721 addr[0] != addr[1] || 722 addr[0] != addr[2] || addr[0] != addr[3]) { 723 e = FTP_PROTOCOL_ERROR; 724 goto ouch; 725 } 726 break; 727 } 728 729 /* seek to required offset */ 730 if (offset) 731 if (ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) 732 goto sysouch; 733 734 /* construct sockaddr for data socket */ 735 l = sizeof(sa); 736 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 737 goto sysouch; 738 if (sa.ss_family == AF_INET6) 739 unmappedaddr((struct sockaddr_in6 *)&sa); 740 switch (sa.ss_family) { 741 case AF_INET6: 742 sin6 = (struct sockaddr_in6 *)&sa; 743 if (e == FTP_EPASSIVE_MODE) 744 sin6->sin6_port = htons(port); 745 else { 746 memcpy(&sin6->sin6_addr, addr + 2, 16); 747 memcpy(&sin6->sin6_port, addr + 19, 2); 748 } 749 break; 750 case AF_INET: 751 sin4 = (struct sockaddr_in *)&sa; 752 if (e == FTP_EPASSIVE_MODE) 753 sin4->sin_port = htons(port); 754 else { 755 memcpy(&sin4->sin_addr, addr, 4); 756 memcpy(&sin4->sin_port, addr + 4, 2); 757 } 758 break; 759 default: 760 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 761 break; 762 } 763 764 /* connect to data port */ 765 if (verbose) 766 fetch_info("opening data connection"); 767 bindaddr = getenv("FETCH_BIND_ADDRESS"); 768 if (bindaddr != NULL && *bindaddr != '\0' && 769 fetch_bind(sd, sa.ss_family, bindaddr) != 0) 770 goto sysouch; 771 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 772 goto sysouch; 773 774 /* make the server initiate the transfer */ 775 if (verbose) 776 fetch_info("initiating transfer"); 777 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 778 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 779 goto ouch; 780 781 } else { 782 u_int32_t a; 783 u_short p; 784 int arg, d; 785 char *ap; 786 char hname[INET6_ADDRSTRLEN]; 787 788 switch (sa.ss_family) { 789 case AF_INET6: 790 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 791 #ifdef IPV6_PORTRANGE 792 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 793 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 794 (char *)&arg, sizeof(arg)) == -1) 795 goto sysouch; 796 #endif 797 break; 798 case AF_INET: 799 ((struct sockaddr_in *)&sa)->sin_port = 0; 800 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 801 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 802 (char *)&arg, sizeof(arg)) == -1) 803 goto sysouch; 804 break; 805 } 806 if (verbose) 807 fetch_info("binding data socket"); 808 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 809 goto sysouch; 810 if (listen(sd, 1) == -1) 811 goto sysouch; 812 813 /* find what port we're on and tell the server */ 814 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 815 goto sysouch; 816 switch (sa.ss_family) { 817 case AF_INET: 818 sin4 = (struct sockaddr_in *)&sa; 819 a = ntohl(sin4->sin_addr.s_addr); 820 p = ntohs(sin4->sin_port); 821 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 822 (a >> 24) & 0xff, (a >> 16) & 0xff, 823 (a >> 8) & 0xff, a & 0xff, 824 (p >> 8) & 0xff, p & 0xff); 825 break; 826 case AF_INET6: 827 #define UC(b) (((int)b)&0xff) 828 e = -1; 829 sin6 = (struct sockaddr_in6 *)&sa; 830 sin6->sin6_scope_id = 0; 831 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 832 hname, sizeof(hname), 833 NULL, 0, NI_NUMERICHOST) == 0) { 834 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 835 htons(sin6->sin6_port)); 836 if (e == -1) 837 goto ouch; 838 } 839 if (e != FTP_OK) { 840 ap = (char *)&sin6->sin6_addr; 841 e = ftp_cmd(conn, 842 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 843 6, 16, 844 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 845 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 846 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 847 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 848 2, 849 (ntohs(sin6->sin6_port) >> 8) & 0xff, 850 ntohs(sin6->sin6_port) & 0xff); 851 } 852 break; 853 default: 854 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 855 goto ouch; 856 } 857 if (e != FTP_OK) 858 goto ouch; 859 860 /* seek to required offset */ 861 if (offset) 862 if (ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) 863 goto sysouch; 864 865 /* make the server initiate the transfer */ 866 if (verbose) 867 fetch_info("initiating transfer"); 868 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 869 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 870 goto ouch; 871 872 /* accept the incoming connection and go to town */ 873 if ((d = accept(sd, NULL, NULL)) == -1) 874 goto sysouch; 875 close(sd); 876 sd = d; 877 } 878 879 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) 880 goto sysouch; 881 return (df); 882 883 sysouch: 884 fetch_syserr(); 885 if (sd >= 0) 886 close(sd); 887 return (NULL); 888 889 ouch: 890 if (e != -1) 891 ftp_seterr(e); 892 if (sd >= 0) 893 close(sd); 894 return (NULL); 895 } 896 897 /* 898 * Authenticate 899 */ 900 static int 901 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 902 { 903 const char *user, *pwd, *logname; 904 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 905 int e, len; 906 907 /* XXX FTP_AUTH, and maybe .netrc */ 908 909 /* send user name and password */ 910 if (url->user[0] == '\0') 911 fetch_netrc_auth(url); 912 user = url->user; 913 if (*user == '\0') 914 user = getenv("FTP_LOGIN"); 915 if (user == NULL || *user == '\0') 916 user = FTP_ANONYMOUS_USER; 917 if (purl && url->port == fetch_default_port(url->scheme)) 918 e = ftp_cmd(conn, "USER %s@%s", user, url->host); 919 else if (purl) 920 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 921 else 922 e = ftp_cmd(conn, "USER %s", user); 923 924 /* did the server request a password? */ 925 if (e == FTP_NEED_PASSWORD) { 926 pwd = url->pwd; 927 if (*pwd == '\0') 928 pwd = getenv("FTP_PASSWORD"); 929 if (pwd == NULL || *pwd == '\0') { 930 if ((logname = getlogin()) == NULL) 931 logname = FTP_ANONYMOUS_USER; 932 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 933 len = 0; 934 else if (len > MAXLOGNAME) 935 len = MAXLOGNAME; 936 gethostname(pbuf + len, sizeof(pbuf) - len); 937 pwd = pbuf; 938 } 939 e = ftp_cmd(conn, "PASS %s", pwd); 940 } 941 942 return (e); 943 } 944 945 /* 946 * Log on to FTP server 947 */ 948 static conn_t * 949 ftp_connect(struct url *url, struct url *purl, const char *flags) 950 { 951 conn_t *conn; 952 int e, direct, verbose; 953 #ifdef INET6 954 int af = AF_UNSPEC; 955 #else 956 int af = AF_INET; 957 #endif 958 959 direct = CHECK_FLAG('d'); 960 verbose = CHECK_FLAG('v'); 961 if (CHECK_FLAG('4')) 962 af = AF_INET; 963 else if (CHECK_FLAG('6')) 964 af = AF_INET6; 965 966 if (direct) 967 purl = NULL; 968 969 /* check for proxy */ 970 if (purl) { 971 /* XXX proxy authentication! */ 972 conn = fetch_connect(purl->host, purl->port, af, verbose); 973 } else { 974 /* no proxy, go straight to target */ 975 conn = fetch_connect(url->host, url->port, af, verbose); 976 purl = NULL; 977 } 978 979 /* check connection */ 980 if (conn == NULL) 981 /* fetch_connect() has already set an error code */ 982 return (NULL); 983 984 /* expect welcome message */ 985 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) 986 goto fouch; 987 988 /* authenticate */ 989 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 990 goto fouch; 991 992 /* TODO: Request extended features supported, if any (RFC 3659). */ 993 994 /* done */ 995 return (conn); 996 997 fouch: 998 if (e != -1) 999 ftp_seterr(e); 1000 fetch_close(conn); 1001 return (NULL); 1002 } 1003 1004 /* 1005 * Disconnect from server 1006 */ 1007 static void 1008 ftp_disconnect(conn_t *conn) 1009 { 1010 (void)ftp_cmd(conn, "QUIT"); 1011 if (conn == cached_connection && conn->ref == 1) 1012 cached_connection = NULL; 1013 fetch_close(conn); 1014 } 1015 1016 /* 1017 * Check if we're already connected 1018 */ 1019 static int 1020 ftp_isconnected(struct url *url) 1021 { 1022 return (cached_connection 1023 && (strcmp(url->host, cached_host.host) == 0) 1024 && (strcmp(url->user, cached_host.user) == 0) 1025 && (strcmp(url->pwd, cached_host.pwd) == 0) 1026 && (url->port == cached_host.port)); 1027 } 1028 1029 /* 1030 * Check the cache, reconnect if no luck 1031 */ 1032 static conn_t * 1033 ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 1034 { 1035 conn_t *conn; 1036 int e; 1037 1038 /* set default port */ 1039 if (!url->port) 1040 url->port = fetch_default_port(url->scheme); 1041 1042 /* try to use previously cached connection */ 1043 if (ftp_isconnected(url)) { 1044 e = ftp_cmd(cached_connection, "NOOP"); 1045 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 1046 return (fetch_ref(cached_connection)); 1047 } 1048 1049 /* connect to server */ 1050 if ((conn = ftp_connect(url, purl, flags)) == NULL) 1051 return (NULL); 1052 if (cached_connection) 1053 ftp_disconnect(cached_connection); 1054 cached_connection = fetch_ref(conn); 1055 memcpy(&cached_host, url, sizeof(*url)); 1056 return (conn); 1057 } 1058 1059 /* 1060 * Check the proxy settings 1061 */ 1062 static struct url * 1063 ftp_get_proxy(struct url * url, const char *flags) 1064 { 1065 struct url *purl; 1066 char *p; 1067 1068 if (flags != NULL && strchr(flags, 'd') != NULL) 1069 return (NULL); 1070 if (fetch_no_proxy_match(url->host)) 1071 return (NULL); 1072 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 1073 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1074 *p && (purl = fetchParseURL(p)) != NULL) { 1075 if (!*purl->scheme) { 1076 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 1077 strcpy(purl->scheme, SCHEME_FTP); 1078 else 1079 strcpy(purl->scheme, SCHEME_HTTP); 1080 } 1081 if (!purl->port) 1082 purl->port = fetch_default_proxy_port(purl->scheme); 1083 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 1084 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1085 return (purl); 1086 fetchFreeURL(purl); 1087 } 1088 return (NULL); 1089 } 1090 1091 /* 1092 * Process an FTP request 1093 */ 1094 FILE * 1095 ftp_request(struct url *url, const char *op, struct url_stat *us, 1096 struct url *purl, const char *flags) 1097 { 1098 conn_t *conn; 1099 int oflag; 1100 1101 /* check if we should use HTTP instead */ 1102 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1103 if (strcmp(op, "STAT") == 0) 1104 return (http_request(url, "HEAD", us, purl, flags)); 1105 else if (strcmp(op, "RETR") == 0) 1106 return (http_request(url, "GET", us, purl, flags)); 1107 /* 1108 * Our HTTP code doesn't support PUT requests yet, so try 1109 * a direct connection. 1110 */ 1111 } 1112 1113 /* connect to server */ 1114 conn = ftp_cached_connect(url, purl, flags); 1115 if (purl) 1116 fetchFreeURL(purl); 1117 if (conn == NULL) 1118 return (NULL); 1119 1120 /* change directory */ 1121 if (ftp_cwd(conn, url->doc) == -1) 1122 goto errsock; 1123 1124 /* stat file */ 1125 if (us && ftp_stat(conn, url->doc, us) == -1 1126 && fetchLastErrCode != FETCH_PROTO 1127 && fetchLastErrCode != FETCH_UNAVAIL) 1128 goto errsock; 1129 1130 /* just a stat */ 1131 if (strcmp(op, "STAT") == 0) { 1132 --conn->ref; 1133 ftp_disconnect(conn); 1134 return (FILE *)1; /* bogus return value */ 1135 } 1136 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 1137 oflag = O_WRONLY; 1138 else 1139 oflag = O_RDONLY; 1140 1141 /* initiate the transfer */ 1142 return (ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); 1143 1144 errsock: 1145 ftp_disconnect(conn); 1146 return (NULL); 1147 } 1148 1149 /* 1150 * Get and stat file 1151 */ 1152 FILE * 1153 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 1154 { 1155 return (ftp_request(url, "RETR", us, ftp_get_proxy(url, flags), flags)); 1156 } 1157 1158 /* 1159 * Get file 1160 */ 1161 FILE * 1162 fetchGetFTP(struct url *url, const char *flags) 1163 { 1164 return (fetchXGetFTP(url, NULL, flags)); 1165 } 1166 1167 /* 1168 * Put file 1169 */ 1170 FILE * 1171 fetchPutFTP(struct url *url, const char *flags) 1172 { 1173 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 1174 ftp_get_proxy(url, flags), flags)); 1175 } 1176 1177 /* 1178 * Get file stats 1179 */ 1180 int 1181 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 1182 { 1183 FILE *f; 1184 1185 f = ftp_request(url, "STAT", us, ftp_get_proxy(url, flags), flags); 1186 if (f == NULL) 1187 return (-1); 1188 /* 1189 * When op is "STAT", ftp_request() will return either NULL or 1190 * (FILE *)1, never a valid FILE *, so we mustn't fclose(f) before 1191 * returning, as it would cause a segfault. 1192 */ 1193 return (0); 1194 } 1195 1196 /* 1197 * List a directory 1198 */ 1199 struct url_ent * 1200 fetchListFTP(struct url *url __unused, const char *flags __unused) 1201 { 1202 warnx("fetchListFTP(): not implemented"); 1203 return (NULL); 1204 } 1205