ftp.c revision 67055
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 * $FreeBSD: head/lib/libfetch/ftp.c 67055 2000-10-13 09:36:46Z des $ 29 */ 30 31/* 32 * Portions of this code were taken from or based on ftpio.c: 33 * 34 * ---------------------------------------------------------------------------- 35 * "THE BEER-WARE LICENSE" (Revision 42): 36 * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you 37 * can do whatever you want with this stuff. If we meet some day, and you think 38 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 39 * ---------------------------------------------------------------------------- 40 * 41 * Major Changelog: 42 * 43 * Dag-Erling Co�dan Sm�rgrav 44 * 9 Jun 1998 45 * 46 * Incorporated into libfetch 47 * 48 * Jordan K. Hubbard 49 * 17 Jan 1996 50 * 51 * Turned inside out. Now returns xfers as new file ids, not as a special 52 * `state' of FTP_t 53 * 54 * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $ 55 * 56 */ 57 58#include <sys/param.h> 59#include <sys/socket.h> 60#include <netinet/in.h> 61 62#include <ctype.h> 63#include <errno.h> 64#include <netdb.h> 65#include <stdarg.h> 66#include <stdio.h> 67#include <stdlib.h> 68#include <string.h> 69#include <time.h> 70#include <unistd.h> 71 72#include "fetch.h" 73#include "common.h" 74#include "ftperr.h" 75 76#define FTP_ANONYMOUS_USER "ftp" 77#define FTP_ANONYMOUS_PASSWORD "ftp" 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_PASSIVE_MODE 227 85#define FTP_LPASSIVE_MODE 228 86#define FTP_EPASSIVE_MODE 229 87#define FTP_LOGGED_IN 230 88#define FTP_FILE_ACTION_OK 250 89#define FTP_NEED_PASSWORD 331 90#define FTP_NEED_ACCOUNT 332 91#define FTP_FILE_OK 350 92#define FTP_SYNTAX_ERROR 500 93#define FTP_PROTOCOL_ERROR 999 94 95static struct url cached_host; 96static int cached_socket; 97 98static char *last_reply; 99static size_t lr_size, lr_length; 100static int last_code; 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/* translate IPv4 mapped IPv6 address to IPv4 address */ 109static void 110unmappedaddr(struct sockaddr_in6 *sin6) 111{ 112 struct sockaddr_in *sin4; 113 u_int32_t addr; 114 int port; 115 116 if (sin6->sin6_family != AF_INET6 || 117 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 118 return; 119 sin4 = (struct sockaddr_in *)sin6; 120 addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12]; 121 port = sin6->sin6_port; 122 memset(sin4, 0, sizeof(struct sockaddr_in)); 123 sin4->sin_addr.s_addr = addr; 124 sin4->sin_port = port; 125 sin4->sin_family = AF_INET; 126 sin4->sin_len = sizeof(struct sockaddr_in); 127} 128 129/* 130 * Get server response 131 */ 132static int 133_ftp_chkerr(int cd) 134{ 135 if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) { 136 _fetch_syserr(); 137 return -1; 138 } 139 if (isftpinfo(last_reply)) { 140 while (!isftpreply(last_reply)) { 141 if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) { 142 _fetch_syserr(); 143 return -1; 144 } 145 } 146 } 147 148 while (lr_length && isspace(last_reply[lr_length-1])) 149 lr_length--; 150 last_reply[lr_length] = 0; 151 152 if (!isftpreply(last_reply)) { 153 _ftp_seterr(FTP_PROTOCOL_ERROR); 154 return -1; 155 } 156 157 last_code = (last_reply[0] - '0') * 100 158 + (last_reply[1] - '0') * 10 159 + (last_reply[2] - '0'); 160 161 return last_code; 162} 163 164/* 165 * Send a command and check reply 166 */ 167static int 168_ftp_cmd(int cd, char *fmt, ...) 169{ 170 va_list ap; 171 size_t len; 172 char *msg; 173 int r; 174 175 va_start(ap, fmt); 176 len = vasprintf(&msg, fmt, ap); 177 va_end(ap); 178 179 if (msg == NULL) { 180 errno = ENOMEM; 181 _fetch_syserr(); 182 return -1; 183 } 184 185 r = _fetch_putln(cd, msg, len); 186 free(msg); 187 188 if (r == -1) { 189 _fetch_syserr(); 190 return -1; 191 } 192 193 return _ftp_chkerr(cd); 194} 195 196/* 197 * Return a pointer to the filename part of a path 198 */ 199static char * 200_ftp_filename(char *file) 201{ 202 char *s; 203 204 if ((s = strrchr(file, '/')) == NULL) 205 return file; 206 else 207 return s + 1; 208} 209 210/* 211 * Change working directory to the directory that contains the 212 * specified file. 213 */ 214static int 215_ftp_cwd(int cd, char *file) 216{ 217 char *s; 218 int e; 219 220 if ((s = strrchr(file, '/')) == NULL || s == file) { 221 e = _ftp_cmd(cd, "CWD /"); 222 } else { 223 e = _ftp_cmd(cd, "CWD %.*s", s - file, file); 224 } 225 if (e != FTP_FILE_ACTION_OK) { 226 _ftp_seterr(e); 227 return -1; 228 } 229 return 0; 230} 231 232/* 233 * Request and parse file stats 234 */ 235static int 236_ftp_stat(int cd, char *file, struct url_stat *us) 237{ 238 char *ln, *s; 239 struct tm tm; 240 time_t t; 241 int e; 242 243 us->size = -1; 244 us->atime = us->mtime = 0; 245 246 if ((s = strrchr(file, '/')) == NULL) 247 s = file; 248 else 249 ++s; 250 251 if ((e = _ftp_cmd(cd, "SIZE %s", s)) != FTP_FILE_STATUS) { 252 _ftp_seterr(e); 253 return -1; 254 } 255 for (ln = last_reply + 4; *ln && isspace(*ln); ln++) 256 /* nothing */ ; 257 for (us->size = 0; *ln && isdigit(*ln); ln++) 258 us->size = us->size * 10 + *ln - '0'; 259 if (*ln && !isspace(*ln)) { 260 _ftp_seterr(FTP_PROTOCOL_ERROR); 261 return -1; 262 } 263 if (us->size == 0) 264 us->size = -1; 265 DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size)); 266 267 if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS) { 268 _ftp_seterr(e); 269 return -1; 270 } 271 for (ln = last_reply + 4; *ln && isspace(*ln); ln++) 272 /* nothing */ ; 273 switch (strspn(ln, "0123456789")) { 274 case 14: 275 break; 276 case 15: 277 ln++; 278 ln[0] = '2'; 279 ln[1] = '0'; 280 break; 281 default: 282 _ftp_seterr(FTP_PROTOCOL_ERROR); 283 return -1; 284 } 285 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 286 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 287 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 288 _ftp_seterr(FTP_PROTOCOL_ERROR); 289 return -1; 290 } 291 tm.tm_mon--; 292 tm.tm_year -= 1900; 293 tm.tm_isdst = -1; 294 t = timegm(&tm); 295 if (t == (time_t)-1) 296 t = time(NULL); 297 us->mtime = t; 298 us->atime = t; 299 DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d " 300 "%02d:%02d:%02d\033[m]\n", 301 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 302 tm.tm_hour, tm.tm_min, tm.tm_sec)); 303 return 0; 304} 305 306/* 307 * Transfer file 308 */ 309static FILE * 310_ftp_transfer(int cd, char *oper, char *file, 311 char *mode, off_t offset, char *flags) 312{ 313 struct sockaddr_storage sin; 314 struct sockaddr_in6 *sin6; 315 struct sockaddr_in *sin4; 316 int pasv, high, verbose; 317 int e, sd = -1; 318 socklen_t l; 319 char *s; 320 FILE *df; 321 322 /* check flags */ 323 pasv = (flags && strchr(flags, 'p')); 324 high = (flags && strchr(flags, 'h')); 325 verbose = (flags && strchr(flags, 'v')); 326 327 /* passive mode */ 328 if (!pasv && (s = getenv("FTP_PASSIVE_MODE")) != NULL) 329 pasv = (strncasecmp(s, "no", 2) != 0); 330 331 /* find our own address, bind, and listen */ 332 l = sizeof sin; 333 if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1) 334 goto sysouch; 335 if (sin.ss_family == AF_INET6) 336 unmappedaddr((struct sockaddr_in6 *)&sin); 337 338 /* open data socket */ 339 if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 340 _fetch_syserr(); 341 return NULL; 342 } 343 344 if (pasv) { 345 u_char addr[64]; 346 char *ln, *p; 347 int i; 348 int port; 349 350 /* send PASV command */ 351 if (verbose) 352 _fetch_info("setting passive mode"); 353 switch (sin.ss_family) { 354 case AF_INET: 355 if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE) 356 goto ouch; 357 break; 358 case AF_INET6: 359 if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) { 360 if (e == -1) 361 goto ouch; 362 if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE) 363 goto ouch; 364 } 365 break; 366 default: 367 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 368 goto ouch; 369 } 370 371 /* 372 * Find address and port number. The reply to the PASV command 373 * is IMHO the one and only weak point in the FTP protocol. 374 */ 375 ln = last_reply; 376 switch (e) { 377 case FTP_PASSIVE_MODE: 378 case FTP_LPASSIVE_MODE: 379 for (p = ln + 3; *p && !isdigit(*p); p++) 380 /* nothing */ ; 381 if (!*p) { 382 e = FTP_PROTOCOL_ERROR; 383 goto ouch; 384 } 385 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 386 for (i = 0; *p && i < l; i++, p++) 387 addr[i] = strtol(p, &p, 10); 388 if (i < l) { 389 e = FTP_PROTOCOL_ERROR; 390 goto ouch; 391 } 392 break; 393 case FTP_EPASSIVE_MODE: 394 for (p = ln + 3; *p && *p != '('; p++) 395 /* nothing */ ; 396 if (!*p) { 397 e = FTP_PROTOCOL_ERROR; 398 goto ouch; 399 } 400 ++p; 401 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 402 &port, &addr[3]) != 5 || 403 addr[0] != addr[1] || 404 addr[0] != addr[2] || addr[0] != addr[3]) { 405 e = FTP_PROTOCOL_ERROR; 406 goto ouch; 407 } 408 break; 409 } 410 411 /* seek to required offset */ 412 if (offset) 413 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK) 414 goto sysouch; 415 416 /* construct sockaddr for data socket */ 417 l = sizeof sin; 418 if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1) 419 goto sysouch; 420 if (sin.ss_family == AF_INET6) 421 unmappedaddr((struct sockaddr_in6 *)&sin); 422 switch (sin.ss_family) { 423 case AF_INET6: 424 sin6 = (struct sockaddr_in6 *)&sin; 425 if (e == FTP_EPASSIVE_MODE) 426 sin6->sin6_port = htons(port); 427 else { 428 bcopy(addr + 2, (char *)&sin6->sin6_addr, 16); 429 bcopy(addr + 19, (char *)&sin6->sin6_port, 2); 430 } 431 break; 432 case AF_INET: 433 sin4 = (struct sockaddr_in *)&sin; 434 if (e == FTP_EPASSIVE_MODE) 435 sin4->sin_port = htons(port); 436 else { 437 bcopy(addr, (char *)&sin4->sin_addr, 4); 438 bcopy(addr + 4, (char *)&sin4->sin_port, 2); 439 } 440 break; 441 default: 442 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 443 break; 444 } 445 446 /* connect to data port */ 447 if (verbose) 448 _fetch_info("opening data connection"); 449 if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1) 450 goto sysouch; 451 452 /* make the server initiate the transfer */ 453 if (verbose) 454 _fetch_info("initiating transfer"); 455 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file)); 456 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 457 goto ouch; 458 459 } else { 460 u_int32_t a; 461 u_short p; 462 int arg, d; 463 char *ap; 464 char hname[INET6_ADDRSTRLEN]; 465 466 switch (sin.ss_family) { 467 case AF_INET6: 468 ((struct sockaddr_in6 *)&sin)->sin6_port = 0; 469#ifdef IPV6_PORTRANGE 470 arg = high ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT; 471 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 472 (char *)&arg, sizeof(arg)) == -1) 473 goto sysouch; 474#endif 475 break; 476 case AF_INET: 477 ((struct sockaddr_in *)&sin)->sin_port = 0; 478 arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 479 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 480 (char *)&arg, sizeof arg) == -1) 481 goto sysouch; 482 break; 483 } 484 if (verbose) 485 _fetch_info("binding data socket"); 486 if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1) 487 goto sysouch; 488 if (listen(sd, 1) == -1) 489 goto sysouch; 490 491 /* find what port we're on and tell the server */ 492 if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1) 493 goto sysouch; 494 switch (sin.ss_family) { 495 case AF_INET: 496 sin4 = (struct sockaddr_in *)&sin; 497 a = ntohl(sin4->sin_addr.s_addr); 498 p = ntohs(sin4->sin_port); 499 e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d", 500 (a >> 24) & 0xff, (a >> 16) & 0xff, 501 (a >> 8) & 0xff, a & 0xff, 502 (p >> 8) & 0xff, p & 0xff); 503 break; 504 case AF_INET6: 505#define UC(b) (((int)b)&0xff) 506 e = -1; 507 sin6 = (struct sockaddr_in6 *)&sin; 508 if (getnameinfo((struct sockaddr *)&sin, sin.ss_len, 509 hname, sizeof(hname), 510 NULL, 0, NI_NUMERICHOST) == 0) { 511 e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname, 512 htons(sin6->sin6_port)); 513 if (e == -1) 514 goto ouch; 515 } 516 if (e != FTP_OK) { 517 ap = (char *)&sin6->sin6_addr; 518 e = _ftp_cmd(cd, 519 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 520 6, 16, 521 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 522 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 523 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 524 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 525 2, 526 (ntohs(sin6->sin6_port) >> 8) & 0xff, 527 ntohs(sin6->sin6_port) & 0xff); 528 } 529 break; 530 default: 531 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 532 goto ouch; 533 } 534 if (e != FTP_OK) 535 goto ouch; 536 537 /* seek to required offset */ 538 if (offset) 539 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK) 540 goto sysouch; 541 542 /* make the server initiate the transfer */ 543 if (verbose) 544 _fetch_info("initiating transfer"); 545 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file)); 546 if (e != FTP_OPEN_DATA_CONNECTION) 547 goto ouch; 548 549 /* accept the incoming connection and go to town */ 550 if ((d = accept(sd, NULL, NULL)) == -1) 551 goto sysouch; 552 close(sd); 553 sd = d; 554 } 555 556 if ((df = fdopen(sd, mode)) == NULL) 557 goto sysouch; 558 return df; 559 560sysouch: 561 _fetch_syserr(); 562 if (sd >= 0) 563 close(sd); 564 return NULL; 565 566ouch: 567 if (e != -1) 568 _ftp_seterr(e); 569 if (sd >= 0) 570 close(sd); 571 return NULL; 572} 573 574/* 575 * Return default port 576 */ 577static int 578_ftp_default_port(void) 579{ 580 struct servent *se; 581 582 if ((se = getservbyname(SCHEME_FTP, "tcp")) != NULL) 583 return ntohs(se->s_port); 584 return FTP_DEFAULT_PORT; 585} 586 587/* 588 * Log on to FTP server 589 */ 590static int 591_ftp_connect(struct url *url, struct url *purl, char *flags) 592{ 593 int cd, e, direct, verbose; 594#ifdef INET6 595 int af = AF_UNSPEC; 596#else 597 int af = AF_INET; 598#endif 599 const char *logname; 600 char *user, *pwd; 601 char localhost[MAXHOSTNAMELEN]; 602 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 603 604 direct = (flags && strchr(flags, 'd')); 605 verbose = (flags && strchr(flags, 'v')); 606 if ((flags && strchr(flags, '4'))) 607 af = AF_INET; 608 else if ((flags && strchr(flags, '6'))) 609 af = AF_INET6; 610 611 if (direct) 612 purl = NULL; 613 614 /* check for proxy */ 615 if (purl) { 616 /* XXX proxy authentication! */ 617 cd = _fetch_connect(purl->host, purl->port, af, verbose); 618 } else { 619 /* no proxy, go straight to target */ 620 cd = _fetch_connect(url->host, url->port, af, verbose); 621 purl = NULL; 622 } 623 624 /* check connection */ 625 if (cd == -1) { 626 _fetch_syserr(); 627 return NULL; 628 } 629 630 /* expect welcome message */ 631 if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY) 632 goto fouch; 633 634 /* XXX FTP_AUTH, and maybe .netrc */ 635 636 /* send user name and password */ 637 user = url->user; 638 if (!user || !*user) 639 user = FTP_ANONYMOUS_USER; 640 if (purl && url->port == FTP_DEFAULT_PORT) 641 e = _ftp_cmd(cd, "USER %s@%s", user, url->host); 642 else if (purl) 643 e = _ftp_cmd(cd, "USER %s@%s@%d", user, url->host, url->port); 644 else 645 e = _ftp_cmd(cd, "USER %s", user); 646 647 /* did the server request a password? */ 648 if (e == FTP_NEED_PASSWORD) { 649 pwd = url->pwd; 650 if (!pwd || !*pwd) 651 pwd = getenv("FTP_PASSWORD"); 652 if (!pwd || !*pwd) { 653 if ((logname = getlogin()) == 0) 654 logname = FTP_ANONYMOUS_PASSWORD; 655 gethostname(localhost, sizeof localhost); 656 snprintf(pbuf, sizeof pbuf, "%s@%s", logname, localhost); 657 pwd = pbuf; 658 } 659 e = _ftp_cmd(cd, "PASS %s", pwd); 660 } 661 662 /* did the server request an account? */ 663 if (e == FTP_NEED_ACCOUNT) 664 goto fouch; 665 666 /* we should be done by now */ 667 if (e != FTP_LOGGED_IN) 668 goto fouch; 669 670 /* might as well select mode and type at once */ 671#ifdef FTP_FORCE_STREAM_MODE 672 if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */ 673 goto fouch; 674#endif 675 if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */ 676 goto fouch; 677 678 /* done */ 679 return cd; 680 681fouch: 682 if (e != -1) 683 _ftp_seterr(e); 684 close(cd); 685 return NULL; 686} 687 688/* 689 * Disconnect from server 690 */ 691static void 692_ftp_disconnect(int cd) 693{ 694 (void)_ftp_cmd(cd, "QUIT"); 695 close(cd); 696} 697 698/* 699 * Check if we're already connected 700 */ 701static int 702_ftp_isconnected(struct url *url) 703{ 704 return (cached_socket 705 && (strcmp(url->host, cached_host.host) == 0) 706 && (strcmp(url->user, cached_host.user) == 0) 707 && (strcmp(url->pwd, cached_host.pwd) == 0) 708 && (url->port == cached_host.port)); 709} 710 711/* 712 * Check the cache, reconnect if no luck 713 */ 714static int 715_ftp_cached_connect(struct url *url, struct url *purl, char *flags) 716{ 717 int e, cd; 718 719 cd = -1; 720 721 /* set default port */ 722 if (!url->port) 723 url->port = _ftp_default_port(); 724 725 /* try to use previously cached connection */ 726 if (_ftp_isconnected(url)) { 727 e = _ftp_cmd(cached_socket, "NOOP"); 728 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 729 return cached_socket; 730 } 731 732 /* connect to server */ 733 if ((cd = _ftp_connect(url, purl, flags)) == -1) 734 return -1; 735 if (cached_socket) 736 _ftp_disconnect(cached_socket); 737 cached_socket = cd; 738 memcpy(&cached_host, url, sizeof *url); 739 return cd; 740} 741 742/* 743 * Check the proxy settings 744 */ 745static struct url * 746_ftp_get_proxy(void) 747{ 748 struct url *purl; 749 char *p; 750 751 if (((p = getenv("FTP_PROXY")) || (p = getenv("HTTP_PROXY"))) && 752 *p && (purl = fetchParseURL(p)) != NULL) { 753 if (!*purl->scheme) 754 strcpy(purl->scheme, SCHEME_FTP); 755 if (!purl->port) 756 purl->port = _ftp_default_port(); 757 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 758 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 759 return purl; 760 fetchFreeURL(purl); 761 } 762 return NULL; 763} 764 765/* 766 * Get and stat file 767 */ 768FILE * 769fetchXGetFTP(struct url *url, struct url_stat *us, char *flags) 770{ 771 struct url *purl; 772 int cd; 773 774 /* get the proxy URL, and check if we should use HTTP instead */ 775 if (!strchr(flags, 'd') && (purl = _ftp_get_proxy()) != NULL) { 776 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 777 return _http_request(url, "GET", us, purl, flags); 778 } else { 779 purl = NULL; 780 } 781 782 /* connect to server */ 783 cd = _ftp_cached_connect(url, purl, flags); 784 if (purl) 785 fetchFreeURL(purl); 786 if (cd == NULL) 787 return NULL; 788 789 /* change directory */ 790 if (_ftp_cwd(cd, url->doc) == -1) 791 return NULL; 792 793 /* stat file */ 794 if (us && _ftp_stat(cd, url->doc, us) == -1 795 && fetchLastErrCode != FETCH_PROTO 796 && fetchLastErrCode != FETCH_UNAVAIL) 797 return NULL; 798 799 /* initiate the transfer */ 800 return _ftp_transfer(cd, "RETR", url->doc, "r", url->offset, flags); 801} 802 803/* 804 * Get file 805 */ 806FILE * 807fetchGetFTP(struct url *url, char *flags) 808{ 809 return fetchXGetFTP(url, NULL, flags); 810} 811 812/* 813 * Put file 814 */ 815FILE * 816fetchPutFTP(struct url *url, char *flags) 817{ 818 struct url *purl; 819 int cd; 820 821 /* get the proxy URL, and check if we should use HTTP instead */ 822 if (!strchr(flags, 'd') && (purl = _ftp_get_proxy()) != NULL) { 823 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 824 /* XXX HTTP PUT is not implemented, so try without the proxy */ 825 purl = NULL; 826 } else { 827 purl = NULL; 828 } 829 830 /* connect to server */ 831 cd = _ftp_cached_connect(url, purl, flags); 832 if (purl) 833 fetchFreeURL(purl); 834 if (cd == NULL) 835 return NULL; 836 837 /* change directory */ 838 if (_ftp_cwd(cd, url->doc) == -1) 839 return NULL; 840 841 /* initiate the transfer */ 842 return _ftp_transfer(cd, (flags && strchr(flags, 'a')) ? "APPE" : "STOR", 843 url->doc, "w", url->offset, flags); 844} 845 846/* 847 * Get file stats 848 */ 849int 850fetchStatFTP(struct url *url, struct url_stat *us, char *flags) 851{ 852 struct url *purl; 853 int cd; 854 855 /* get the proxy URL, and check if we should use HTTP instead */ 856 if (!strchr(flags, 'd') && (purl = _ftp_get_proxy()) != NULL) { 857 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 858 FILE *f; 859 860 if ((f = _http_request(url, "HEAD", us, purl, flags)) == NULL) 861 return -1; 862 fclose(f); 863 return 0; 864 } 865 } else { 866 purl = NULL; 867 } 868 869 /* connect to server */ 870 cd = _ftp_cached_connect(url, purl, flags); 871 if (purl) 872 fetchFreeURL(purl); 873 if (cd == NULL) 874 return NULL; 875 876 /* change directory */ 877 if (_ftp_cwd(cd, url->doc) == -1) 878 return -1; 879 880 /* stat file */ 881 return _ftp_stat(cd, url->doc, us); 882} 883 884/* 885 * List a directory 886 */ 887extern void warnx(char *, ...); 888struct url_ent * 889fetchListFTP(struct url *url, char *flags) 890{ 891 warnx("fetchListFTP(): not implemented"); 892 return NULL; 893} 894