ftp.c revision 90267
1/*- 2 * Copyright (c) 1998 Dag-Erling Co�dan Sm�rgrav 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#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/lib/libfetch/ftp.c 90267 2002-02-05 22:13:51Z des $"); 31 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@login.dknet.dk> 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 Co�dan Sm�rgrav 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 <stdio.h> 70#include <stdlib.h> 71#include <string.h> 72#include <time.h> 73#include <unistd.h> 74 75#include "fetch.h" 76#include "common.h" 77#include "ftperr.h" 78 79#define FTP_ANONYMOUS_USER "anonymous" 80 81#define FTP_CONNECTION_ALREADY_OPEN 125 82#define FTP_OPEN_DATA_CONNECTION 150 83#define FTP_OK 200 84#define FTP_FILE_STATUS 213 85#define FTP_SERVICE_READY 220 86#define FTP_TRANSFER_COMPLETE 226 87#define FTP_PASSIVE_MODE 227 88#define FTP_LPASSIVE_MODE 228 89#define FTP_EPASSIVE_MODE 229 90#define FTP_LOGGED_IN 230 91#define FTP_FILE_ACTION_OK 250 92#define FTP_NEED_PASSWORD 331 93#define FTP_NEED_ACCOUNT 332 94#define FTP_FILE_OK 350 95#define FTP_SYNTAX_ERROR 500 96#define FTP_PROTOCOL_ERROR 999 97 98static struct url cached_host; 99static int cached_socket; 100 101static char *last_reply; 102static size_t lr_size; 103static size_t lr_length; 104static int last_code; 105 106#define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 107 && isdigit(foo[2]) \ 108 && (foo[3] == ' ' || foo[3] == '\0')) 109#define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 110 && isdigit(foo[2]) && foo[3] == '-') 111 112/* 113 * Translate IPv4 mapped IPv6 address to IPv4 address 114 */ 115static void 116unmappedaddr(struct sockaddr_in6 *sin6) 117{ 118 struct sockaddr_in *sin4; 119 u_int32_t addr; 120 int port; 121 122 if (sin6->sin6_family != AF_INET6 || 123 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 124 return; 125 sin4 = (struct sockaddr_in *)sin6; 126 addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12]; 127 port = sin6->sin6_port; 128 memset(sin4, 0, sizeof(struct sockaddr_in)); 129 sin4->sin_addr.s_addr = addr; 130 sin4->sin_port = port; 131 sin4->sin_family = AF_INET; 132 sin4->sin_len = sizeof(struct sockaddr_in); 133} 134 135/* 136 * Get server response 137 */ 138static int 139_ftp_chkerr(int cd) 140{ 141 if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) { 142 _fetch_syserr(); 143 return (-1); 144 } 145 if (isftpinfo(last_reply)) { 146 while (lr_length && !isftpreply(last_reply)) { 147 if (_fetch_getln(cd, &last_reply, 148 &lr_size, &lr_length) == -1) { 149 _fetch_syserr(); 150 return (-1); 151 } 152 } 153 } 154 155 while (lr_length && isspace(last_reply[lr_length-1])) 156 lr_length--; 157 last_reply[lr_length] = 0; 158 159 if (!isftpreply(last_reply)) { 160 _ftp_seterr(FTP_PROTOCOL_ERROR); 161 return (-1); 162 } 163 164 last_code = (last_reply[0] - '0') * 100 165 + (last_reply[1] - '0') * 10 166 + (last_reply[2] - '0'); 167 168 return (last_code); 169} 170 171/* 172 * Send a command and check reply 173 */ 174static int 175_ftp_cmd(int cd, const char *fmt, ...) 176{ 177 va_list ap; 178 size_t len; 179 char *msg; 180 int r; 181 182 va_start(ap, fmt); 183 len = vasprintf(&msg, fmt, ap); 184 va_end(ap); 185 186 if (msg == NULL) { 187 errno = ENOMEM; 188 _fetch_syserr(); 189 return (-1); 190 } 191 192 r = _fetch_putln(cd, msg, len); 193 free(msg); 194 195 if (r == -1) { 196 _fetch_syserr(); 197 return (-1); 198 } 199 200 return (_ftp_chkerr(cd)); 201} 202 203/* 204 * Return a pointer to the filename part of a path 205 */ 206static const char * 207_ftp_filename(const char *file) 208{ 209 char *s; 210 211 if ((s = strrchr(file, '/')) == NULL) 212 return (file); 213 else 214 return (s + 1); 215} 216 217/* 218 * Change working directory to the directory that contains the specified 219 * file. 220 */ 221static int 222_ftp_cwd(int cd, const char *file) 223{ 224 char *s; 225 int e; 226 227 if ((s = strrchr(file, '/')) == NULL || s == file) { 228 e = _ftp_cmd(cd, "CWD /"); 229 } else { 230 e = _ftp_cmd(cd, "CWD %.*s", s - file, file); 231 } 232 if (e != FTP_FILE_ACTION_OK) { 233 _ftp_seterr(e); 234 return (-1); 235 } 236 return (0); 237} 238 239/* 240 * Request and parse file stats 241 */ 242static int 243_ftp_stat(int cd, const char *file, struct url_stat *us) 244{ 245 char *ln; 246 const char *s; 247 struct tm tm; 248 time_t t; 249 int e; 250 251 us->size = -1; 252 us->atime = us->mtime = 0; 253 254 if ((s = strrchr(file, '/')) == NULL) 255 s = file; 256 else 257 ++s; 258 259 if ((e = _ftp_cmd(cd, "SIZE %s", s)) != FTP_FILE_STATUS) { 260 _ftp_seterr(e); 261 return (-1); 262 } 263 for (ln = last_reply + 4; *ln && isspace(*ln); ln++) 264 /* nothing */ ; 265 for (us->size = 0; *ln && isdigit(*ln); ln++) 266 us->size = us->size * 10 + *ln - '0'; 267 if (*ln && !isspace(*ln)) { 268 _ftp_seterr(FTP_PROTOCOL_ERROR); 269 us->size = -1; 270 return (-1); 271 } 272 if (us->size == 0) 273 us->size = -1; 274 DEBUG(fprintf(stderr, "size: [%lld]\n", (long long)us->size)); 275 276 if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS) { 277 _ftp_seterr(e); 278 return (-1); 279 } 280 for (ln = last_reply + 4; *ln && isspace(*ln); ln++) 281 /* nothing */ ; 282 switch (strspn(ln, "0123456789")) { 283 case 14: 284 break; 285 case 15: 286 ln++; 287 ln[0] = '2'; 288 ln[1] = '0'; 289 break; 290 default: 291 _ftp_seterr(FTP_PROTOCOL_ERROR); 292 return (-1); 293 } 294 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 295 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 296 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 297 _ftp_seterr(FTP_PROTOCOL_ERROR); 298 return (-1); 299 } 300 tm.tm_mon--; 301 tm.tm_year -= 1900; 302 tm.tm_isdst = -1; 303 t = timegm(&tm); 304 if (t == (time_t)-1) 305 t = time(NULL); 306 us->mtime = t; 307 us->atime = t; 308 DEBUG(fprintf(stderr, 309 "last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", 310 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 311 tm.tm_hour, tm.tm_min, tm.tm_sec)); 312 return (0); 313} 314 315/* 316 * I/O functions for FTP 317 */ 318struct ftpio { 319 int csd; /* Control socket descriptor */ 320 int dsd; /* Data socket descriptor */ 321 int dir; /* Direction */ 322 int eof; /* EOF reached */ 323 int err; /* Error code */ 324}; 325 326static int _ftp_readfn(void *, char *, int); 327static int _ftp_writefn(void *, const char *, int); 328static fpos_t _ftp_seekfn(void *, fpos_t, int); 329static int _ftp_closefn(void *); 330 331static int 332_ftp_readfn(void *v, char *buf, int len) 333{ 334 struct ftpio *io; 335 int r; 336 337 io = (struct ftpio *)v; 338 if (io == NULL) { 339 errno = EBADF; 340 return (-1); 341 } 342 if (io->csd == -1 || io->dsd == -1 || io->dir == O_WRONLY) { 343 errno = EBADF; 344 return (-1); 345 } 346 if (io->err) { 347 errno = io->err; 348 return (-1); 349 } 350 if (io->eof) 351 return (0); 352 r = read(io->dsd, buf, len); 353 if (r > 0) 354 return (r); 355 if (r == 0) { 356 io->eof = 1; 357 return (0); 358 } 359 if (errno != EINTR) 360 io->err = errno; 361 return (-1); 362} 363 364static int 365_ftp_writefn(void *v, const char *buf, int len) 366{ 367 struct ftpio *io; 368 int w; 369 370 io = (struct ftpio *)v; 371 if (io == NULL) { 372 errno = EBADF; 373 return (-1); 374 } 375 if (io->csd == -1 || io->dsd == -1 || io->dir == O_RDONLY) { 376 errno = EBADF; 377 return (-1); 378 } 379 if (io->err) { 380 errno = io->err; 381 return (-1); 382 } 383 w = write(io->dsd, buf, len); 384 if (w >= 0) 385 return (w); 386 if (errno != EINTR) 387 io->err = errno; 388 return (-1); 389} 390 391static fpos_t 392_ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 393{ 394 struct ftpio *io; 395 396 io = (struct ftpio *)v; 397 if (io == NULL) { 398 errno = EBADF; 399 return (-1); 400 } 401 errno = ESPIPE; 402 return (-1); 403} 404 405static int 406_ftp_closefn(void *v) 407{ 408 struct ftpio *io; 409 int r; 410 411 io = (struct ftpio *)v; 412 if (io == NULL) { 413 errno = EBADF; 414 return (-1); 415 } 416 if (io->dir == -1) 417 return (0); 418 if (io->csd == -1 || io->dsd == -1) { 419 errno = EBADF; 420 return (-1); 421 } 422 close(io->dsd); 423 io->dir = -1; 424 io->dsd = -1; 425 DEBUG(fprintf(stderr, "Waiting for final status\n")); 426 r = _ftp_chkerr(io->csd); 427 close(io->csd); 428 free(io); 429 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 430} 431 432static FILE * 433_ftp_setup(int csd, int dsd, int mode) 434{ 435 struct ftpio *io; 436 FILE *f; 437 438 if ((io = malloc(sizeof *io)) == NULL) 439 return (NULL); 440 io->csd = dup(csd); 441 io->dsd = dsd; 442 io->dir = mode; 443 io->eof = io->err = 0; 444 f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn); 445 if (f == NULL) 446 free(io); 447 return (f); 448} 449 450/* 451 * Transfer file 452 */ 453static FILE * 454_ftp_transfer(int cd, const char *oper, const char *file, 455 int mode, off_t offset, const char *flags) 456{ 457 struct sockaddr_storage sa; 458 struct sockaddr_in6 *sin6; 459 struct sockaddr_in *sin4; 460 int low, pasv, verbose; 461 int e, sd = -1; 462 socklen_t l; 463 char *s; 464 FILE *df; 465 466 /* check flags */ 467 low = CHECK_FLAG('l'); 468 pasv = CHECK_FLAG('p'); 469 verbose = CHECK_FLAG('v'); 470 471 /* passive mode */ 472 if (!pasv) 473 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 474 strncasecmp(s, "no", 2) != 0); 475 476 /* find our own address, bind, and listen */ 477 l = sizeof sa; 478 if (getsockname(cd, (struct sockaddr *)&sa, &l) == -1) 479 goto sysouch; 480 if (sa.ss_family == AF_INET6) 481 unmappedaddr((struct sockaddr_in6 *)&sa); 482 483 /* open data socket */ 484 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 485 _fetch_syserr(); 486 return (NULL); 487 } 488 489 if (pasv) { 490 u_char addr[64]; 491 char *ln, *p; 492 unsigned int i; 493 int port; 494 495 /* send PASV command */ 496 if (verbose) 497 _fetch_info("setting passive mode"); 498 switch (sa.ss_family) { 499 case AF_INET: 500 if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE) 501 goto ouch; 502 break; 503 case AF_INET6: 504 if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) { 505 if (e == -1) 506 goto ouch; 507 if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE) 508 goto ouch; 509 } 510 break; 511 default: 512 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 513 goto ouch; 514 } 515 516 /* 517 * Find address and port number. The reply to the PASV command 518 * is IMHO the one and only weak point in the FTP protocol. 519 */ 520 ln = last_reply; 521 switch (e) { 522 case FTP_PASSIVE_MODE: 523 case FTP_LPASSIVE_MODE: 524 for (p = ln + 3; *p && !isdigit(*p); p++) 525 /* nothing */ ; 526 if (!*p) { 527 e = FTP_PROTOCOL_ERROR; 528 goto ouch; 529 } 530 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 531 for (i = 0; *p && i < l; i++, p++) 532 addr[i] = strtol(p, &p, 10); 533 if (i < l) { 534 e = FTP_PROTOCOL_ERROR; 535 goto ouch; 536 } 537 break; 538 case FTP_EPASSIVE_MODE: 539 for (p = ln + 3; *p && *p != '('; p++) 540 /* nothing */ ; 541 if (!*p) { 542 e = FTP_PROTOCOL_ERROR; 543 goto ouch; 544 } 545 ++p; 546 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 547 &port, &addr[3]) != 5 || 548 addr[0] != addr[1] || 549 addr[0] != addr[2] || addr[0] != addr[3]) { 550 e = FTP_PROTOCOL_ERROR; 551 goto ouch; 552 } 553 break; 554 } 555 556 /* seek to required offset */ 557 if (offset) 558 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK) 559 goto sysouch; 560 561 /* construct sockaddr for data socket */ 562 l = sizeof sa; 563 if (getpeername(cd, (struct sockaddr *)&sa, &l) == -1) 564 goto sysouch; 565 if (sa.ss_family == AF_INET6) 566 unmappedaddr((struct sockaddr_in6 *)&sa); 567 switch (sa.ss_family) { 568 case AF_INET6: 569 sin6 = (struct sockaddr_in6 *)&sa; 570 if (e == FTP_EPASSIVE_MODE) 571 sin6->sin6_port = htons(port); 572 else { 573 bcopy(addr + 2, (char *)&sin6->sin6_addr, 16); 574 bcopy(addr + 19, (char *)&sin6->sin6_port, 2); 575 } 576 break; 577 case AF_INET: 578 sin4 = (struct sockaddr_in *)&sa; 579 if (e == FTP_EPASSIVE_MODE) 580 sin4->sin_port = htons(port); 581 else { 582 bcopy(addr, (char *)&sin4->sin_addr, 4); 583 bcopy(addr + 4, (char *)&sin4->sin_port, 2); 584 } 585 break; 586 default: 587 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 588 break; 589 } 590 591 /* connect to data port */ 592 if (verbose) 593 _fetch_info("opening data connection"); 594 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 595 goto sysouch; 596 597 /* make the server initiate the transfer */ 598 if (verbose) 599 _fetch_info("initiating transfer"); 600 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file)); 601 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 602 goto ouch; 603 604 } else { 605 u_int32_t a; 606 u_short p; 607 int arg, d; 608 char *ap; 609 char hname[INET6_ADDRSTRLEN]; 610 611 switch (sa.ss_family) { 612 case AF_INET6: 613 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 614#ifdef IPV6_PORTRANGE 615 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 616 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 617 (char *)&arg, sizeof(arg)) == -1) 618 goto sysouch; 619#endif 620 break; 621 case AF_INET: 622 ((struct sockaddr_in *)&sa)->sin_port = 0; 623 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 624 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 625 (char *)&arg, sizeof arg) == -1) 626 goto sysouch; 627 break; 628 } 629 if (verbose) 630 _fetch_info("binding data socket"); 631 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 632 goto sysouch; 633 if (listen(sd, 1) == -1) 634 goto sysouch; 635 636 /* find what port we're on and tell the server */ 637 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 638 goto sysouch; 639 switch (sa.ss_family) { 640 case AF_INET: 641 sin4 = (struct sockaddr_in *)&sa; 642 a = ntohl(sin4->sin_addr.s_addr); 643 p = ntohs(sin4->sin_port); 644 e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d", 645 (a >> 24) & 0xff, (a >> 16) & 0xff, 646 (a >> 8) & 0xff, a & 0xff, 647 (p >> 8) & 0xff, p & 0xff); 648 break; 649 case AF_INET6: 650#define UC(b) (((int)b)&0xff) 651 e = -1; 652 sin6 = (struct sockaddr_in6 *)&sa; 653 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 654 hname, sizeof(hname), 655 NULL, 0, NI_NUMERICHOST) == 0) { 656 e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname, 657 htons(sin6->sin6_port)); 658 if (e == -1) 659 goto ouch; 660 } 661 if (e != FTP_OK) { 662 ap = (char *)&sin6->sin6_addr; 663 e = _ftp_cmd(cd, 664 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 665 6, 16, 666 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 667 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 668 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 669 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 670 2, 671 (ntohs(sin6->sin6_port) >> 8) & 0xff, 672 ntohs(sin6->sin6_port) & 0xff); 673 } 674 break; 675 default: 676 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 677 goto ouch; 678 } 679 if (e != FTP_OK) 680 goto ouch; 681 682 /* seek to required offset */ 683 if (offset) 684 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK) 685 goto sysouch; 686 687 /* make the server initiate the transfer */ 688 if (verbose) 689 _fetch_info("initiating transfer"); 690 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file)); 691 if (e != FTP_OPEN_DATA_CONNECTION) 692 goto ouch; 693 694 /* accept the incoming connection and go to town */ 695 if ((d = accept(sd, NULL, NULL)) == -1) 696 goto sysouch; 697 close(sd); 698 sd = d; 699 } 700 701 if ((df = _ftp_setup(cd, sd, mode)) == NULL) 702 goto sysouch; 703 return (df); 704 705sysouch: 706 _fetch_syserr(); 707 if (sd >= 0) 708 close(sd); 709 return (NULL); 710 711ouch: 712 if (e != -1) 713 _ftp_seterr(e); 714 if (sd >= 0) 715 close(sd); 716 return (NULL); 717} 718 719/* 720 * Authenticate 721 */ 722static int 723_ftp_authenticate(int cd, struct url *url, struct url *purl) 724{ 725 const char *user, *pwd, *logname; 726 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 727 int e, len; 728 729 /* XXX FTP_AUTH, and maybe .netrc */ 730 731 /* send user name and password */ 732 user = url->user; 733 if (!user || !*user) 734 user = getenv("FTP_LOGIN"); 735 if (!user || !*user) 736 user = FTP_ANONYMOUS_USER; 737 if (purl && url->port == _fetch_default_port(url->scheme)) 738 e = _ftp_cmd(cd, "USER %s@%s", user, url->host); 739 else if (purl) 740 e = _ftp_cmd(cd, "USER %s@%s@%d", user, url->host, url->port); 741 else 742 e = _ftp_cmd(cd, "USER %s", user); 743 744 /* did the server request a password? */ 745 if (e == FTP_NEED_PASSWORD) { 746 pwd = url->pwd; 747 if (!pwd || !*pwd) 748 pwd = getenv("FTP_PASSWORD"); 749 if (!pwd || !*pwd) { 750 if ((logname = getlogin()) == 0) 751 logname = FTP_ANONYMOUS_USER; 752 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 753 len = 0; 754 else if (len > MAXLOGNAME) 755 len = MAXLOGNAME; 756 gethostname(pbuf + len, sizeof pbuf - len); 757 pwd = pbuf; 758 } 759 e = _ftp_cmd(cd, "PASS %s", pwd); 760 } 761 762 return (e); 763} 764 765/* 766 * Log on to FTP server 767 */ 768static int 769_ftp_connect(struct url *url, struct url *purl, const char *flags) 770{ 771 int cd, e, direct, verbose; 772#ifdef INET6 773 int af = AF_UNSPEC; 774#else 775 int af = AF_INET; 776#endif 777 778 direct = CHECK_FLAG('d'); 779 verbose = CHECK_FLAG('v'); 780 if (CHECK_FLAG('4')) 781 af = AF_INET; 782 else if (CHECK_FLAG('6')) 783 af = AF_INET6; 784 785 if (direct) 786 purl = NULL; 787 788 /* check for proxy */ 789 if (purl) { 790 /* XXX proxy authentication! */ 791 cd = _fetch_connect(purl->host, purl->port, af, verbose); 792 } else { 793 /* no proxy, go straight to target */ 794 cd = _fetch_connect(url->host, url->port, af, verbose); 795 purl = NULL; 796 } 797 798 /* check connection */ 799 if (cd == -1) { 800 _fetch_syserr(); 801 return (NULL); 802 } 803 804 /* expect welcome message */ 805 if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY) 806 goto fouch; 807 808 /* authenticate */ 809 if ((e = _ftp_authenticate(cd, url, purl)) != FTP_LOGGED_IN) 810 goto fouch; 811 812 /* might as well select mode and type at once */ 813#ifdef FTP_FORCE_STREAM_MODE 814 if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */ 815 goto fouch; 816#endif 817 if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */ 818 goto fouch; 819 820 /* done */ 821 return (cd); 822 823fouch: 824 if (e != -1) 825 _ftp_seterr(e); 826 close(cd); 827 return (NULL); 828} 829 830/* 831 * Disconnect from server 832 */ 833static void 834_ftp_disconnect(int cd) 835{ 836 (void)_ftp_cmd(cd, "QUIT"); 837 close(cd); 838} 839 840/* 841 * Check if we're already connected 842 */ 843static int 844_ftp_isconnected(struct url *url) 845{ 846 return (cached_socket 847 && (strcmp(url->host, cached_host.host) == 0) 848 && (strcmp(url->user, cached_host.user) == 0) 849 && (strcmp(url->pwd, cached_host.pwd) == 0) 850 && (url->port == cached_host.port)); 851} 852 853/* 854 * Check the cache, reconnect if no luck 855 */ 856static int 857_ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 858{ 859 int e, cd; 860 861 cd = -1; 862 863 /* set default port */ 864 if (!url->port) 865 url->port = _fetch_default_port(url->scheme); 866 867 /* try to use previously cached connection */ 868 if (_ftp_isconnected(url)) { 869 e = _ftp_cmd(cached_socket, "NOOP"); 870 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 871 return (cached_socket); 872 } 873 874 /* connect to server */ 875 if ((cd = _ftp_connect(url, purl, flags)) == -1) 876 return (-1); 877 if (cached_socket) 878 _ftp_disconnect(cached_socket); 879 cached_socket = cd; 880 memcpy(&cached_host, url, sizeof *url); 881 return (cd); 882} 883 884/* 885 * Check the proxy settings 886 */ 887static struct url * 888_ftp_get_proxy(void) 889{ 890 struct url *purl; 891 char *p; 892 893 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 894 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 895 *p && (purl = fetchParseURL(p)) != NULL) { 896 if (!*purl->scheme) { 897 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 898 strcpy(purl->scheme, SCHEME_FTP); 899 else 900 strcpy(purl->scheme, SCHEME_HTTP); 901 } 902 if (!purl->port) 903 purl->port = _fetch_default_proxy_port(purl->scheme); 904 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 905 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 906 return (purl); 907 fetchFreeURL(purl); 908 } 909 return (NULL); 910} 911 912/* 913 * Process an FTP request 914 */ 915FILE * 916_ftp_request(struct url *url, const char *op, struct url_stat *us, 917 struct url *purl, const char *flags) 918{ 919 int cd, oflag; 920 921 /* check if we should use HTTP instead */ 922 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 923 if (strcmp(op, "STAT") == 0) 924 return (_http_request(url, "HEAD", us, purl, flags)); 925 else if (strcmp(op, "RETR") == 0) 926 return (_http_request(url, "GET", us, purl, flags)); 927 /* 928 * Our HTTP code doesn't support PUT requests yet, so try 929 * a direct connection. 930 */ 931 } 932 933 /* connect to server */ 934 cd = _ftp_cached_connect(url, purl, flags); 935 if (purl) 936 fetchFreeURL(purl); 937 if (cd == NULL) 938 return (NULL); 939 940 /* change directory */ 941 if (_ftp_cwd(cd, url->doc) == -1) 942 return (NULL); 943 944 /* stat file */ 945 if (us && _ftp_stat(cd, url->doc, us) == -1 946 && fetchLastErrCode != FETCH_PROTO 947 && fetchLastErrCode != FETCH_UNAVAIL) 948 return (NULL); 949 950 /* just a stat */ 951 if (strcmp(op, "STAT") == 0) 952 return (FILE *)1; /* bogus return value */ 953 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 954 oflag = O_WRONLY; 955 else 956 oflag = O_RDONLY; 957 958 /* initiate the transfer */ 959 return (_ftp_transfer(cd, op, url->doc, oflag, url->offset, flags)); 960} 961 962/* 963 * Get and stat file 964 */ 965FILE * 966fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 967{ 968 return (_ftp_request(url, "RETR", us, _ftp_get_proxy(), flags)); 969} 970 971/* 972 * Get file 973 */ 974FILE * 975fetchGetFTP(struct url *url, const char *flags) 976{ 977 return (fetchXGetFTP(url, NULL, flags)); 978} 979 980/* 981 * Put file 982 */ 983FILE * 984fetchPutFTP(struct url *url, const char *flags) 985{ 986 987 return _ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 988 _ftp_get_proxy(), flags); 989} 990 991/* 992 * Get file stats 993 */ 994int 995fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 996{ 997 998 if (_ftp_request(url, "STAT", us, _ftp_get_proxy(), flags) == NULL) 999 return (-1); 1000 return (0); 1001} 1002 1003/* 1004 * List a directory 1005 */ 1006struct url_ent * 1007fetchListFTP(struct url *url __unused, const char *flags __unused) 1008{ 1009 warnx("fetchListFTP(): not implemented"); 1010 return (NULL); 1011} 1012