ftp.c revision 97856
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 97856 2002-06-05 10:05:03Z 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@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 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 <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_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 99static struct url cached_host; 100static conn_t *cached_connection; 101 102#define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 103 && isdigit(foo[2]) \ 104 && (foo[3] == ' ' || foo[3] == '\0')) 105#define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 106 && isdigit(foo[2]) && foo[3] == '-') 107 108/* 109 * Translate IPv4 mapped IPv6 address to IPv4 address 110 */ 111static void 112unmappedaddr(struct sockaddr_in6 *sin6) 113{ 114 struct sockaddr_in *sin4; 115 u_int32_t addr; 116 int port; 117 118 if (sin6->sin6_family != AF_INET6 || 119 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 120 return; 121 sin4 = (struct sockaddr_in *)sin6; 122 addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12]; 123 port = sin6->sin6_port; 124 memset(sin4, 0, sizeof(struct sockaddr_in)); 125 sin4->sin_addr.s_addr = addr; 126 sin4->sin_port = port; 127 sin4->sin_family = AF_INET; 128 sin4->sin_len = sizeof(struct sockaddr_in); 129} 130 131/* 132 * Get server response 133 */ 134static int 135_ftp_chkerr(conn_t *conn) 136{ 137 if (_fetch_getln(conn) == -1) { 138 _fetch_syserr(); 139 return (-1); 140 } 141 if (isftpinfo(conn->buf)) { 142 while (conn->buflen && !isftpreply(conn->buf)) { 143 if (_fetch_getln(conn) == -1) { 144 _fetch_syserr(); 145 return (-1); 146 } 147 } 148 } 149 150 while (conn->buflen && isspace(conn->buf[conn->buflen - 1])) 151 conn->buflen--; 152 conn->buf[conn->buflen] = '\0'; 153 154 if (!isftpreply(conn->buf)) { 155 _ftp_seterr(FTP_PROTOCOL_ERROR); 156 return (-1); 157 } 158 159 conn->err = (conn->buf[0] - '0') * 100 160 + (conn->buf[1] - '0') * 10 161 + (conn->buf[2] - '0'); 162 163 return (conn->err); 164} 165 166/* 167 * Send a command and check reply 168 */ 169static int 170_ftp_cmd(conn_t *conn, const char *fmt, ...) 171{ 172 va_list ap; 173 size_t len; 174 char *msg; 175 int r; 176 177 va_start(ap, fmt); 178 len = vasprintf(&msg, fmt, ap); 179 va_end(ap); 180 181 if (msg == NULL) { 182 errno = ENOMEM; 183 _fetch_syserr(); 184 return (-1); 185 } 186 187 r = _fetch_putln(conn, msg, len); 188 free(msg); 189 190 if (r == -1) { 191 _fetch_syserr(); 192 return (-1); 193 } 194 195 return (_ftp_chkerr(conn)); 196} 197 198/* 199 * Return a pointer to the filename part of a path 200 */ 201static const char * 202_ftp_filename(const char *file) 203{ 204 char *s; 205 206 if ((s = strrchr(file, '/')) == NULL) 207 return (file); 208 else 209 return (s + 1); 210} 211 212/* 213 * Change working directory to the directory that contains the specified 214 * file. 215 */ 216static int 217_ftp_cwd(conn_t *conn, const char *file) 218{ 219 char *s; 220 int e; 221 222 if ((s = strrchr(file, '/')) == NULL || s == file) { 223 e = _ftp_cmd(conn, "CWD /"); 224 } else { 225 e = _ftp_cmd(conn, "CWD %.*s", s - file, file); 226 } 227 if (e != FTP_FILE_ACTION_OK) { 228 _ftp_seterr(e); 229 return (-1); 230 } 231 return (0); 232} 233 234/* 235 * Request and parse file stats 236 */ 237static int 238_ftp_stat(conn_t *conn, const char *file, struct url_stat *us) 239{ 240 char *ln; 241 const char *s; 242 struct tm tm; 243 time_t t; 244 int e; 245 246 us->size = -1; 247 us->atime = us->mtime = 0; 248 249 if ((s = strrchr(file, '/')) == NULL) 250 s = file; 251 else 252 ++s; 253 254 if ((e = _ftp_cmd(conn, "SIZE %s", s)) != FTP_FILE_STATUS) { 255 _ftp_seterr(e); 256 return (-1); 257 } 258 for (ln = conn->buf + 4; *ln && isspace(*ln); ln++) 259 /* nothing */ ; 260 for (us->size = 0; *ln && isdigit(*ln); ln++) 261 us->size = us->size * 10 + *ln - '0'; 262 if (*ln && !isspace(*ln)) { 263 _ftp_seterr(FTP_PROTOCOL_ERROR); 264 us->size = -1; 265 return (-1); 266 } 267 if (us->size == 0) 268 us->size = -1; 269 DEBUG(fprintf(stderr, "size: [%lld]\n", (long long)us->size)); 270 271 if ((e = _ftp_cmd(conn, "MDTM %s", s)) != FTP_FILE_STATUS) { 272 _ftp_seterr(e); 273 return (-1); 274 } 275 for (ln = conn->buf + 4; *ln && isspace(*ln); ln++) 276 /* nothing */ ; 277 switch (strspn(ln, "0123456789")) { 278 case 14: 279 break; 280 case 15: 281 ln++; 282 ln[0] = '2'; 283 ln[1] = '0'; 284 break; 285 default: 286 _ftp_seterr(FTP_PROTOCOL_ERROR); 287 return (-1); 288 } 289 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 290 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 291 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 292 _ftp_seterr(FTP_PROTOCOL_ERROR); 293 return (-1); 294 } 295 tm.tm_mon--; 296 tm.tm_year -= 1900; 297 tm.tm_isdst = -1; 298 t = timegm(&tm); 299 if (t == (time_t)-1) 300 t = time(NULL); 301 us->mtime = t; 302 us->atime = t; 303 DEBUG(fprintf(stderr, 304 "last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", 305 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 306 tm.tm_hour, tm.tm_min, tm.tm_sec)); 307 return (0); 308} 309 310/* 311 * I/O functions for FTP 312 */ 313struct ftpio { 314 conn_t *conn; /* Control connection */ 315 int dsd; /* Data socket descriptor */ 316 int dir; /* Direction */ 317 int eof; /* EOF reached */ 318 int err; /* Error code */ 319}; 320 321static int _ftp_readfn(void *, char *, int); 322static int _ftp_writefn(void *, const char *, int); 323static fpos_t _ftp_seekfn(void *, fpos_t, int); 324static int _ftp_closefn(void *); 325 326static int 327_ftp_readfn(void *v, char *buf, int len) 328{ 329 struct ftpio *io; 330 int r; 331 332 io = (struct ftpio *)v; 333 if (io == NULL) { 334 errno = EBADF; 335 return (-1); 336 } 337 if (io->conn == NULL || io->dsd == -1 || io->dir == O_WRONLY) { 338 errno = EBADF; 339 return (-1); 340 } 341 if (io->err) { 342 errno = io->err; 343 return (-1); 344 } 345 if (io->eof) 346 return (0); 347 r = read(io->dsd, buf, len); 348 if (r > 0) 349 return (r); 350 if (r == 0) { 351 io->eof = 1; 352 return (0); 353 } 354 if (errno != EINTR) 355 io->err = errno; 356 return (-1); 357} 358 359static int 360_ftp_writefn(void *v, const char *buf, int len) 361{ 362 struct ftpio *io; 363 int w; 364 365 io = (struct ftpio *)v; 366 if (io == NULL) { 367 errno = EBADF; 368 return (-1); 369 } 370 if (io->conn == NULL || io->dsd == -1 || io->dir == O_RDONLY) { 371 errno = EBADF; 372 return (-1); 373 } 374 if (io->err) { 375 errno = io->err; 376 return (-1); 377 } 378 w = write(io->dsd, buf, len); 379 if (w >= 0) 380 return (w); 381 if (errno != EINTR) 382 io->err = errno; 383 return (-1); 384} 385 386static fpos_t 387_ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 388{ 389 struct ftpio *io; 390 391 io = (struct ftpio *)v; 392 if (io == NULL) { 393 errno = EBADF; 394 return (-1); 395 } 396 errno = ESPIPE; 397 return (-1); 398} 399 400static int 401_ftp_closefn(void *v) 402{ 403 struct ftpio *io; 404 int r; 405 406 io = (struct ftpio *)v; 407 if (io == NULL) { 408 errno = EBADF; 409 return (-1); 410 } 411 if (io->dir == -1) 412 return (0); 413 if (io->conn == NULL || io->dsd == -1) { 414 errno = EBADF; 415 return (-1); 416 } 417 close(io->dsd); 418 io->dir = -1; 419 io->dsd = -1; 420 DEBUG(fprintf(stderr, "Waiting for final status\n")); 421 r = _ftp_chkerr(io->conn); 422 _fetch_close(io->conn); 423 free(io); 424 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 425} 426 427static FILE * 428_ftp_setup(conn_t *conn, int dsd, int mode) 429{ 430 struct ftpio *io; 431 FILE *f; 432 433 if ((io = malloc(sizeof *io)) == NULL) 434 return (NULL); 435 io->conn = conn; 436 io->dsd = dsd; 437 io->dir = mode; 438 io->eof = io->err = 0; 439 f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn); 440 if (f == NULL) 441 free(io); 442 return (f); 443} 444 445/* 446 * Transfer file 447 */ 448static FILE * 449_ftp_transfer(conn_t *conn, const char *oper, const char *file, 450 int mode, off_t offset, const char *flags) 451{ 452 struct sockaddr_storage sa; 453 struct sockaddr_in6 *sin6; 454 struct sockaddr_in *sin4; 455 int low, pasv, verbose; 456 int e, sd = -1; 457 socklen_t l; 458 char *s; 459 FILE *df; 460 461 /* check flags */ 462 low = CHECK_FLAG('l'); 463 pasv = CHECK_FLAG('p'); 464 verbose = CHECK_FLAG('v'); 465 466 /* passive mode */ 467 if (!pasv) 468 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 469 strncasecmp(s, "no", 2) != 0); 470 471 /* find our own address, bind, and listen */ 472 l = sizeof sa; 473 if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1) 474 goto sysouch; 475 if (sa.ss_family == AF_INET6) 476 unmappedaddr((struct sockaddr_in6 *)&sa); 477 478 /* open data socket */ 479 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 480 _fetch_syserr(); 481 return (NULL); 482 } 483 484 if (pasv) { 485 u_char addr[64]; 486 char *ln, *p; 487 unsigned int i; 488 int port; 489 490 /* send PASV command */ 491 if (verbose) 492 _fetch_info("setting passive mode"); 493 switch (sa.ss_family) { 494 case AF_INET: 495 if ((e = _ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) 496 goto ouch; 497 break; 498 case AF_INET6: 499 if ((e = _ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { 500 if (e == -1) 501 goto ouch; 502 if ((e = _ftp_cmd(conn, "LPSV")) != 503 FTP_LPASSIVE_MODE) 504 goto ouch; 505 } 506 break; 507 default: 508 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 509 goto ouch; 510 } 511 512 /* 513 * Find address and port number. The reply to the PASV command 514 * is IMHO the one and only weak point in the FTP protocol. 515 */ 516 ln = conn->buf; 517 switch (e) { 518 case FTP_PASSIVE_MODE: 519 case FTP_LPASSIVE_MODE: 520 for (p = ln + 3; *p && !isdigit(*p); p++) 521 /* nothing */ ; 522 if (!*p) { 523 e = FTP_PROTOCOL_ERROR; 524 goto ouch; 525 } 526 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 527 for (i = 0; *p && i < l; i++, p++) 528 addr[i] = strtol(p, &p, 10); 529 if (i < l) { 530 e = FTP_PROTOCOL_ERROR; 531 goto ouch; 532 } 533 break; 534 case FTP_EPASSIVE_MODE: 535 for (p = ln + 3; *p && *p != '('; p++) 536 /* nothing */ ; 537 if (!*p) { 538 e = FTP_PROTOCOL_ERROR; 539 goto ouch; 540 } 541 ++p; 542 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 543 &port, &addr[3]) != 5 || 544 addr[0] != addr[1] || 545 addr[0] != addr[2] || addr[0] != addr[3]) { 546 e = FTP_PROTOCOL_ERROR; 547 goto ouch; 548 } 549 break; 550 } 551 552 /* seek to required offset */ 553 if (offset) 554 if (_ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) 555 goto sysouch; 556 557 /* construct sockaddr for data socket */ 558 l = sizeof sa; 559 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) 560 goto sysouch; 561 if (sa.ss_family == AF_INET6) 562 unmappedaddr((struct sockaddr_in6 *)&sa); 563 switch (sa.ss_family) { 564 case AF_INET6: 565 sin6 = (struct sockaddr_in6 *)&sa; 566 if (e == FTP_EPASSIVE_MODE) 567 sin6->sin6_port = htons(port); 568 else { 569 bcopy(addr + 2, (char *)&sin6->sin6_addr, 16); 570 bcopy(addr + 19, (char *)&sin6->sin6_port, 2); 571 } 572 break; 573 case AF_INET: 574 sin4 = (struct sockaddr_in *)&sa; 575 if (e == FTP_EPASSIVE_MODE) 576 sin4->sin_port = htons(port); 577 else { 578 bcopy(addr, (char *)&sin4->sin_addr, 4); 579 bcopy(addr + 4, (char *)&sin4->sin_port, 2); 580 } 581 break; 582 default: 583 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 584 break; 585 } 586 587 /* connect to data port */ 588 if (verbose) 589 _fetch_info("opening data connection"); 590 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 591 goto sysouch; 592 593 /* make the server initiate the transfer */ 594 if (verbose) 595 _fetch_info("initiating transfer"); 596 e = _ftp_cmd(conn, "%s %s", oper, _ftp_filename(file)); 597 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 598 goto ouch; 599 600 } else { 601 u_int32_t a; 602 u_short p; 603 int arg, d; 604 char *ap; 605 char hname[INET6_ADDRSTRLEN]; 606 607 switch (sa.ss_family) { 608 case AF_INET6: 609 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 610#ifdef IPV6_PORTRANGE 611 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 612 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 613 (char *)&arg, sizeof(arg)) == -1) 614 goto sysouch; 615#endif 616 break; 617 case AF_INET: 618 ((struct sockaddr_in *)&sa)->sin_port = 0; 619 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 620 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 621 (char *)&arg, sizeof arg) == -1) 622 goto sysouch; 623 break; 624 } 625 if (verbose) 626 _fetch_info("binding data socket"); 627 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 628 goto sysouch; 629 if (listen(sd, 1) == -1) 630 goto sysouch; 631 632 /* find what port we're on and tell the server */ 633 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 634 goto sysouch; 635 switch (sa.ss_family) { 636 case AF_INET: 637 sin4 = (struct sockaddr_in *)&sa; 638 a = ntohl(sin4->sin_addr.s_addr); 639 p = ntohs(sin4->sin_port); 640 e = _ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", 641 (a >> 24) & 0xff, (a >> 16) & 0xff, 642 (a >> 8) & 0xff, a & 0xff, 643 (p >> 8) & 0xff, p & 0xff); 644 break; 645 case AF_INET6: 646#define UC(b) (((int)b)&0xff) 647 e = -1; 648 sin6 = (struct sockaddr_in6 *)&sa; 649 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 650 hname, sizeof(hname), 651 NULL, 0, NI_NUMERICHOST) == 0) { 652 e = _ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, 653 htons(sin6->sin6_port)); 654 if (e == -1) 655 goto ouch; 656 } 657 if (e != FTP_OK) { 658 ap = (char *)&sin6->sin6_addr; 659 e = _ftp_cmd(conn, 660 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 661 6, 16, 662 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 663 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 664 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 665 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 666 2, 667 (ntohs(sin6->sin6_port) >> 8) & 0xff, 668 ntohs(sin6->sin6_port) & 0xff); 669 } 670 break; 671 default: 672 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 673 goto ouch; 674 } 675 if (e != FTP_OK) 676 goto ouch; 677 678 /* seek to required offset */ 679 if (offset) 680 if (_ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) 681 goto sysouch; 682 683 /* make the server initiate the transfer */ 684 if (verbose) 685 _fetch_info("initiating transfer"); 686 e = _ftp_cmd(conn, "%s %s", oper, _ftp_filename(file)); 687 if (e != FTP_OPEN_DATA_CONNECTION) 688 goto ouch; 689 690 /* accept the incoming connection and go to town */ 691 if ((d = accept(sd, NULL, NULL)) == -1) 692 goto sysouch; 693 close(sd); 694 sd = d; 695 } 696 697 if ((df = _ftp_setup(conn, sd, mode)) == NULL) 698 goto sysouch; 699 return (df); 700 701sysouch: 702 _fetch_syserr(); 703 if (sd >= 0) 704 close(sd); 705 return (NULL); 706 707ouch: 708 if (e != -1) 709 _ftp_seterr(e); 710 if (sd >= 0) 711 close(sd); 712 return (NULL); 713} 714 715/* 716 * Authenticate 717 */ 718static int 719_ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) 720{ 721 const char *user, *pwd, *logname; 722 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 723 int e, len; 724 725 /* XXX FTP_AUTH, and maybe .netrc */ 726 727 /* send user name and password */ 728 user = url->user; 729 if (!user || !*user) 730 user = getenv("FTP_LOGIN"); 731 if (!user || !*user) 732 user = FTP_ANONYMOUS_USER; 733 if (purl && url->port == _fetch_default_port(url->scheme)) 734 e = _ftp_cmd(conn, "USER %s@%s", user, url->host); 735 else if (purl) 736 e = _ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); 737 else 738 e = _ftp_cmd(conn, "USER %s", user); 739 740 /* did the server request a password? */ 741 if (e == FTP_NEED_PASSWORD) { 742 pwd = url->pwd; 743 if (!pwd || !*pwd) 744 pwd = getenv("FTP_PASSWORD"); 745 if (!pwd || !*pwd) { 746 if ((logname = getlogin()) == 0) 747 logname = FTP_ANONYMOUS_USER; 748 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 749 len = 0; 750 else if (len > MAXLOGNAME) 751 len = MAXLOGNAME; 752 gethostname(pbuf + len, sizeof pbuf - len); 753 pwd = pbuf; 754 } 755 e = _ftp_cmd(conn, "PASS %s", pwd); 756 } 757 758 return (e); 759} 760 761/* 762 * Log on to FTP server 763 */ 764static conn_t * 765_ftp_connect(struct url *url, struct url *purl, const char *flags) 766{ 767 conn_t *conn; 768 int e, direct, verbose; 769#ifdef INET6 770 int af = AF_UNSPEC; 771#else 772 int af = AF_INET; 773#endif 774 775 direct = CHECK_FLAG('d'); 776 verbose = CHECK_FLAG('v'); 777 if (CHECK_FLAG('4')) 778 af = AF_INET; 779 else if (CHECK_FLAG('6')) 780 af = AF_INET6; 781 782 if (direct) 783 purl = NULL; 784 785 /* check for proxy */ 786 if (purl) { 787 /* XXX proxy authentication! */ 788 conn = _fetch_connect(purl->host, purl->port, af, verbose); 789 } else { 790 /* no proxy, go straight to target */ 791 conn = _fetch_connect(url->host, url->port, af, verbose); 792 purl = NULL; 793 } 794 795 /* check connection */ 796 if (conn == NULL) { 797 _fetch_syserr(); 798 return (NULL); 799 } 800 801 /* expect welcome message */ 802 if ((e = _ftp_chkerr(conn)) != FTP_SERVICE_READY) 803 goto fouch; 804 805 /* authenticate */ 806 if ((e = _ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) 807 goto fouch; 808 809 /* might as well select mode and type at once */ 810#ifdef FTP_FORCE_STREAM_MODE 811 if ((e = _ftp_cmd(conn, "MODE S")) != FTP_OK) /* default is S */ 812 goto fouch; 813#endif 814 if ((e = _ftp_cmd(conn, "TYPE I")) != FTP_OK) /* default is A */ 815 goto fouch; 816 817 /* done */ 818 return (conn); 819 820fouch: 821 if (e != -1) 822 _ftp_seterr(e); 823 _fetch_close(conn); 824 return (NULL); 825} 826 827/* 828 * Disconnect from server 829 */ 830static void 831_ftp_disconnect(conn_t *conn) 832{ 833 (void)_ftp_cmd(conn, "QUIT"); 834 _fetch_close(conn); 835} 836 837/* 838 * Check if we're already connected 839 */ 840static int 841_ftp_isconnected(struct url *url) 842{ 843 return (cached_connection 844 && (strcmp(url->host, cached_host.host) == 0) 845 && (strcmp(url->user, cached_host.user) == 0) 846 && (strcmp(url->pwd, cached_host.pwd) == 0) 847 && (url->port == cached_host.port)); 848} 849 850/* 851 * Check the cache, reconnect if no luck 852 */ 853static conn_t * 854_ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 855{ 856 conn_t *conn; 857 int e; 858 859 /* set default port */ 860 if (!url->port) 861 url->port = _fetch_default_port(url->scheme); 862 863 /* try to use previously cached connection */ 864 if (_ftp_isconnected(url)) { 865 e = _ftp_cmd(cached_connection, "NOOP"); 866 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 867 return (cached_connection); 868 } 869 870 /* connect to server */ 871 if ((conn = _ftp_connect(url, purl, flags)) == NULL) 872 return (NULL); 873 if (cached_connection) 874 _ftp_disconnect(cached_connection); 875 cached_connection = conn; 876 memcpy(&cached_host, url, sizeof *url); 877 return (conn); 878} 879 880/* 881 * Check the proxy settings 882 */ 883static struct url * 884_ftp_get_proxy(void) 885{ 886 struct url *purl; 887 char *p; 888 889 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 890 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 891 *p && (purl = fetchParseURL(p)) != NULL) { 892 if (!*purl->scheme) { 893 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 894 strcpy(purl->scheme, SCHEME_FTP); 895 else 896 strcpy(purl->scheme, SCHEME_HTTP); 897 } 898 if (!purl->port) 899 purl->port = _fetch_default_proxy_port(purl->scheme); 900 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 901 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 902 return (purl); 903 fetchFreeURL(purl); 904 } 905 return (NULL); 906} 907 908/* 909 * Process an FTP request 910 */ 911FILE * 912_ftp_request(struct url *url, const char *op, struct url_stat *us, 913 struct url *purl, const char *flags) 914{ 915 conn_t *conn; 916 int oflag; 917 918 /* check if we should use HTTP instead */ 919 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 920 if (strcmp(op, "STAT") == 0) 921 return (_http_request(url, "HEAD", us, purl, flags)); 922 else if (strcmp(op, "RETR") == 0) 923 return (_http_request(url, "GET", us, purl, flags)); 924 /* 925 * Our HTTP code doesn't support PUT requests yet, so try 926 * a direct connection. 927 */ 928 } 929 930 /* connect to server */ 931 conn = _ftp_cached_connect(url, purl, flags); 932 if (purl) 933 fetchFreeURL(purl); 934 if (conn == NULL) 935 return (NULL); 936 937 /* change directory */ 938 if (_ftp_cwd(conn, url->doc) == -1) 939 return (NULL); 940 941 /* stat file */ 942 if (us && _ftp_stat(conn, url->doc, us) == -1 943 && fetchLastErrCode != FETCH_PROTO 944 && fetchLastErrCode != FETCH_UNAVAIL) 945 return (NULL); 946 947 /* just a stat */ 948 if (strcmp(op, "STAT") == 0) 949 return (FILE *)1; /* bogus return value */ 950 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) 951 oflag = O_WRONLY; 952 else 953 oflag = O_RDONLY; 954 955 /* initiate the transfer */ 956 return (_ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); 957} 958 959/* 960 * Get and stat file 961 */ 962FILE * 963fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 964{ 965 return (_ftp_request(url, "RETR", us, _ftp_get_proxy(), flags)); 966} 967 968/* 969 * Get file 970 */ 971FILE * 972fetchGetFTP(struct url *url, const char *flags) 973{ 974 return (fetchXGetFTP(url, NULL, flags)); 975} 976 977/* 978 * Put file 979 */ 980FILE * 981fetchPutFTP(struct url *url, const char *flags) 982{ 983 984 return _ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 985 _ftp_get_proxy(), flags); 986} 987 988/* 989 * Get file stats 990 */ 991int 992fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 993{ 994 995 if (_ftp_request(url, "STAT", us, _ftp_get_proxy(), flags) == NULL) 996 return (-1); 997 return (0); 998} 999 1000/* 1001 * List a directory 1002 */ 1003struct url_ent * 1004fetchListFTP(struct url *url __unused, const char *flags __unused) 1005{ 1006 warnx("fetchListFTP(): not implemented"); 1007 return (NULL); 1008} 1009