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("$FreeBSD$"); 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 98 static struct url cached_host; 99 static int cached_socket; 100 101 static char *last_reply; 102 static size_t lr_size, lr_length; 103 static int last_code; 104 105 #define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 106 && isdigit(foo[2]) \ 107 && (foo[3] == ' ' || foo[3] == '\0')) 108 #define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 109 && isdigit(foo[2]) && foo[3] == '-') 110 111 /* translate IPv4 mapped IPv6 address to IPv4 address */ 112 static void 113 unmappedaddr(struct sockaddr_in6 *sin6) 114 { 115 struct sockaddr_in *sin4; 116 u_int32_t addr; 117 int port; 118 119 if (sin6->sin6_family != AF_INET6 || 120 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 121 return; 122 sin4 = (struct sockaddr_in *)sin6; 123 addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12]; 124 port = sin6->sin6_port; 125 memset(sin4, 0, sizeof(struct sockaddr_in)); 126 sin4->sin_addr.s_addr = addr; 127 sin4->sin_port = port; 128 sin4->sin_family = AF_INET; 129 sin4->sin_len = sizeof(struct sockaddr_in); 130 } 131 132 /* 133 * Get server response 134 */ 135 static int 136 _ftp_chkerr(int cd) 137 { 138 if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) { 139 _fetch_syserr(); 140 return -1; 141 } 142 if (isftpinfo(last_reply)) { 143 while (lr_length && !isftpreply(last_reply)) { 144 if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) { 145 _fetch_syserr(); 146 return -1; 147 } 148 } 149 } 150 151 while (lr_length && isspace(last_reply[lr_length-1])) 152 lr_length--; 153 last_reply[lr_length] = 0; 154 155 if (!isftpreply(last_reply)) { 156 _ftp_seterr(FTP_PROTOCOL_ERROR); 157 return -1; 158 } 159 160 last_code = (last_reply[0] - '0') * 100 161 + (last_reply[1] - '0') * 10 162 + (last_reply[2] - '0'); 163 164 return last_code; 165 } 166 167 /* 168 * Send a command and check reply 169 */ 170 static int 171 _ftp_cmd(int cd, const char *fmt, ...) 172 { 173 va_list ap; 174 size_t len; 175 char *msg; 176 int r; 177 178 va_start(ap, fmt); 179 len = vasprintf(&msg, fmt, ap); 180 va_end(ap); 181 182 if (msg == NULL) { 183 errno = ENOMEM; 184 _fetch_syserr(); 185 return -1; 186 } 187 188 r = _fetch_putln(cd, msg, len); 189 free(msg); 190 191 if (r == -1) { 192 _fetch_syserr(); 193 return -1; 194 } 195 196 return _ftp_chkerr(cd); 197 } 198 199 /* 200 * Return a pointer to the filename part of a path 201 */ 202 static const char * 203 _ftp_filename(const char *file) 204 { 205 char *s; 206 207 if ((s = strrchr(file, '/')) == NULL) 208 return file; 209 else 210 return s + 1; 211 } 212 213 /* 214 * Change working directory to the directory that contains the 215 * specified file. 216 */ 217 static int 218 _ftp_cwd(int cd, const char *file) 219 { 220 char *s; 221 int e; 222 223 if ((s = strrchr(file, '/')) == NULL || s == file) { 224 e = _ftp_cmd(cd, "CWD /"); 225 } else { 226 e = _ftp_cmd(cd, "CWD %.*s", s - file, file); 227 } 228 if (e != FTP_FILE_ACTION_OK) { 229 _ftp_seterr(e); 230 return -1; 231 } 232 return 0; 233 } 234 235 /* 236 * Request and parse file stats 237 */ 238 static int 239 _ftp_stat(int cd, const char *file, struct url_stat *us) 240 { 241 char *ln; 242 const char *s; 243 struct tm tm; 244 time_t t; 245 int e; 246 247 us->size = -1; 248 us->atime = us->mtime = 0; 249 250 if ((s = strrchr(file, '/')) == NULL) 251 s = file; 252 else 253 ++s; 254 255 if ((e = _ftp_cmd(cd, "SIZE %s", s)) != FTP_FILE_STATUS) { 256 _ftp_seterr(e); 257 return -1; 258 } 259 for (ln = last_reply + 4; *ln && isspace(*ln); ln++) 260 /* nothing */ ; 261 for (us->size = 0; *ln && isdigit(*ln); ln++) 262 us->size = us->size * 10 + *ln - '0'; 263 if (*ln && !isspace(*ln)) { 264 _ftp_seterr(FTP_PROTOCOL_ERROR); 265 us->size = -1; 266 return -1; 267 } 268 if (us->size == 0) 269 us->size = -1; 270 DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", (long long)us->size)); 271 272 if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS) { 273 _ftp_seterr(e); 274 return -1; 275 } 276 for (ln = last_reply + 4; *ln && isspace(*ln); ln++) 277 /* nothing */ ; 278 switch (strspn(ln, "0123456789")) { 279 case 14: 280 break; 281 case 15: 282 ln++; 283 ln[0] = '2'; 284 ln[1] = '0'; 285 break; 286 default: 287 _ftp_seterr(FTP_PROTOCOL_ERROR); 288 return -1; 289 } 290 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 291 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 292 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 293 _ftp_seterr(FTP_PROTOCOL_ERROR); 294 return -1; 295 } 296 tm.tm_mon--; 297 tm.tm_year -= 1900; 298 tm.tm_isdst = -1; 299 t = timegm(&tm); 300 if (t == (time_t)-1) 301 t = time(NULL); 302 us->mtime = t; 303 us->atime = t; 304 DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d " 305 "%02d:%02d:%02d\033[m]\n", 306 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 307 tm.tm_hour, tm.tm_min, tm.tm_sec)); 308 return 0; 309 } 310 311 /* 312 * I/O functions for FTP 313 */ 314 struct ftpio { 315 int csd; /* Control socket descriptor */ 316 int dsd; /* Data socket descriptor */ 317 int dir; /* Direction */ 318 int eof; /* EOF reached */ 319 int err; /* Error code */ 320 }; 321 322 static int _ftp_readfn(void *, char *, int); 323 static int _ftp_writefn(void *, const char *, int); 324 static fpos_t _ftp_seekfn(void *, fpos_t, int); 325 static int _ftp_closefn(void *); 326 327 static int 328 _ftp_readfn(void *v, char *buf, int len) 329 { 330 struct ftpio *io; 331 int r; 332 333 io = (struct ftpio *)v; 334 if (io == NULL) { 335 errno = EBADF; 336 return -1; 337 } 338 if (io->csd == -1 || io->dsd == -1 || io->dir == O_WRONLY) { 339 errno = EBADF; 340 return -1; 341 } 342 if (io->err) { 343 errno = io->err; 344 return -1; 345 } 346 if (io->eof) 347 return 0; 348 r = read(io->dsd, buf, len); 349 if (r > 0) 350 return r; 351 if (r == 0) { 352 io->eof = 1; 353 return 0; 354 } 355 if (errno != EINTR) 356 io->err = errno; 357 return -1; 358 } 359 360 static int 361 _ftp_writefn(void *v, const char *buf, int len) 362 { 363 struct ftpio *io; 364 int w; 365 366 io = (struct ftpio *)v; 367 if (io == NULL) { 368 errno = EBADF; 369 return -1; 370 } 371 if (io->csd == -1 || io->dsd == -1 || io->dir == O_RDONLY) { 372 errno = EBADF; 373 return -1; 374 } 375 if (io->err) { 376 errno = io->err; 377 return -1; 378 } 379 w = write(io->dsd, buf, len); 380 if (w >= 0) 381 return w; 382 if (errno != EINTR) 383 io->err = errno; 384 return -1; 385 } 386 387 static fpos_t 388 _ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 389 { 390 struct ftpio *io; 391 392 io = (struct ftpio *)v; 393 if (io == NULL) { 394 errno = EBADF; 395 return -1; 396 } 397 errno = ESPIPE; 398 return -1; 399 } 400 401 static int 402 _ftp_closefn(void *v) 403 { 404 struct ftpio *io; 405 int r; 406 407 io = (struct ftpio *)v; 408 if (io == NULL) { 409 errno = EBADF; 410 return -1; 411 } 412 if (io->dir == -1) 413 return 0; 414 if (io->csd == -1 || io->dsd == -1) { 415 errno = EBADF; 416 return -1; 417 } 418 close(io->dsd); 419 io->dir = -1; 420 io->dsd = -1; 421 DEBUG(fprintf(stderr, "Waiting for final status\n")); 422 r = _ftp_chkerr(io->csd); 423 close(io->csd); 424 free(io); 425 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 426 } 427 428 static FILE * 429 _ftp_setup(int csd, int dsd, int mode) 430 { 431 struct ftpio *io; 432 FILE *f; 433 434 if ((io = malloc(sizeof *io)) == NULL) 435 return NULL; 436 io->csd = dup(csd); 437 io->dsd = dsd; 438 io->dir = mode; 439 io->eof = io->err = 0; 440 f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn); 441 if (f == NULL) 442 free(io); 443 return f; 444 } 445 446 /* 447 * Transfer file 448 */ 449 static FILE * 450 _ftp_transfer(int cd, const char *oper, const char *file, 451 int mode, off_t offset, const char *flags) 452 { 453 struct sockaddr_storage sa; 454 struct sockaddr_in6 *sin6; 455 struct sockaddr_in *sin4; 456 int low, pasv, verbose; 457 int e, sd = -1; 458 socklen_t l; 459 char *s; 460 FILE *df; 461 462 /* check flags */ 463 low = CHECK_FLAG('l'); 464 pasv = CHECK_FLAG('p'); 465 verbose = CHECK_FLAG('v'); 466 467 /* passive mode */ 468 if (!pasv) 469 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 470 strncasecmp(s, "no", 2) != 0); 471 472 /* find our own address, bind, and listen */ 473 l = sizeof sa; 474 if (getsockname(cd, (struct sockaddr *)&sa, &l) == -1) 475 goto sysouch; 476 if (sa.ss_family == AF_INET6) 477 unmappedaddr((struct sockaddr_in6 *)&sa); 478 479 /* open data socket */ 480 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 481 _fetch_syserr(); 482 return NULL; 483 } 484 485 if (pasv) { 486 u_char addr[64]; 487 char *ln, *p; 488 unsigned int i; 489 int port; 490 491 /* send PASV command */ 492 if (verbose) 493 _fetch_info("setting passive mode"); 494 switch (sa.ss_family) { 495 case AF_INET: 496 if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE) 497 goto ouch; 498 break; 499 case AF_INET6: 500 if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) { 501 if (e == -1) 502 goto ouch; 503 if ((e = _ftp_cmd(cd, "LPSV")) != 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 = last_reply; 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(cd, "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(cd, (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(cd, "%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(cd, "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(cd, "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(cd, 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(cd, "REST %lu", (u_long)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(cd, "%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(cd, sd, mode)) == NULL) 698 goto sysouch; 699 return df; 700 701 sysouch: 702 _fetch_syserr(); 703 if (sd >= 0) 704 close(sd); 705 return NULL; 706 707 ouch: 708 if (e != -1) 709 _ftp_seterr(e); 710 if (sd >= 0) 711 close(sd); 712 return NULL; 713 } 714 715 /* 716 * Authenticate 717 */ 718 static int 719 _ftp_authenticate(int cd, 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(cd, "USER %s@%s", user, url->host); 735 else if (purl) 736 e = _ftp_cmd(cd, "USER %s@%s@%d", user, url->host, url->port); 737 else 738 e = _ftp_cmd(cd, "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(cd, "PASS %s", pwd); 756 } 757 758 return e; 759 } 760 761 /* 762 * Log on to FTP server 763 */ 764 static int 765 _ftp_connect(struct url *url, struct url *purl, const char *flags) 766 { 767 int cd, e, direct, verbose; 768 #ifdef INET6 769 int af = AF_UNSPEC; 770 #else 771 int af = AF_INET; 772 #endif 773 774 direct = CHECK_FLAG('d'); 775 verbose = CHECK_FLAG('v'); 776 if (CHECK_FLAG('4')) 777 af = AF_INET; 778 else if (CHECK_FLAG('6')) 779 af = AF_INET6; 780 781 if (direct) 782 purl = NULL; 783 784 /* check for proxy */ 785 if (purl) { 786 /* XXX proxy authentication! */ 787 cd = _fetch_connect(purl->host, purl->port, af, verbose); 788 } else { 789 /* no proxy, go straight to target */ 790 cd = _fetch_connect(url->host, url->port, af, verbose); 791 purl = NULL; 792 } 793 794 /* check connection */ 795 if (cd == -1) { 796 _fetch_syserr(); 797 return NULL; 798 } 799 800 /* expect welcome message */ 801 if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY) 802 goto fouch; 803 804 /* authenticate */ 805 if ((e = _ftp_authenticate(cd, url, purl)) != FTP_LOGGED_IN) 806 goto fouch; 807 808 /* might as well select mode and type at once */ 809 #ifdef FTP_FORCE_STREAM_MODE 810 if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */ 811 goto fouch; 812 #endif 813 if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */ 814 goto fouch; 815 816 /* done */ 817 return cd; 818 819 fouch: 820 if (e != -1) 821 _ftp_seterr(e); 822 close(cd); 823 return NULL; 824 } 825 826 /* 827 * Disconnect from server 828 */ 829 static void 830 _ftp_disconnect(int cd) 831 { 832 (void)_ftp_cmd(cd, "QUIT"); 833 close(cd); 834 } 835 836 /* 837 * Check if we're already connected 838 */ 839 static int 840 _ftp_isconnected(struct url *url) 841 { 842 return (cached_socket 843 && (strcmp(url->host, cached_host.host) == 0) 844 && (strcmp(url->user, cached_host.user) == 0) 845 && (strcmp(url->pwd, cached_host.pwd) == 0) 846 && (url->port == cached_host.port)); 847 } 848 849 /* 850 * Check the cache, reconnect if no luck 851 */ 852 static int 853 _ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 854 { 855 int e, cd; 856 857 cd = -1; 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_socket, "NOOP"); 866 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 867 return cached_socket; 868 } 869 870 /* connect to server */ 871 if ((cd = _ftp_connect(url, purl, flags)) == -1) 872 return -1; 873 if (cached_socket) 874 _ftp_disconnect(cached_socket); 875 cached_socket = cd; 876 memcpy(&cached_host, url, sizeof *url); 877 return cd; 878 } 879 880 /* 881 * Check the proxy settings 882 */ 883 static 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 * Get and stat file 910 */ 911 FILE * 912 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 913 { 914 struct url *purl; 915 int cd; 916 917 /* get the proxy URL, and check if we should use HTTP instead */ 918 if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) { 919 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 920 return _http_request(url, "GET", us, purl, flags); 921 } else { 922 purl = NULL; 923 } 924 925 /* connect to server */ 926 cd = _ftp_cached_connect(url, purl, flags); 927 if (purl) 928 fetchFreeURL(purl); 929 if (cd == NULL) 930 return NULL; 931 932 /* change directory */ 933 if (_ftp_cwd(cd, url->doc) == -1) 934 return NULL; 935 936 /* stat file */ 937 if (us && _ftp_stat(cd, url->doc, us) == -1 938 && fetchLastErrCode != FETCH_PROTO 939 && fetchLastErrCode != FETCH_UNAVAIL) 940 return NULL; 941 942 /* initiate the transfer */ 943 return _ftp_transfer(cd, "RETR", url->doc, O_RDONLY, url->offset, flags); 944 } 945 946 /* 947 * Get file 948 */ 949 FILE * 950 fetchGetFTP(struct url *url, const char *flags) 951 { 952 return fetchXGetFTP(url, NULL, flags); 953 } 954 955 /* 956 * Put file 957 */ 958 FILE * 959 fetchPutFTP(struct url *url, const char *flags) 960 { 961 struct url *purl; 962 int cd; 963 964 /* get the proxy URL, and check if we should use HTTP instead */ 965 if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) { 966 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 967 /* XXX HTTP PUT is not implemented, so try without the proxy */ 968 purl = NULL; 969 } else { 970 purl = NULL; 971 } 972 973 /* connect to server */ 974 cd = _ftp_cached_connect(url, purl, flags); 975 if (purl) 976 fetchFreeURL(purl); 977 if (cd == NULL) 978 return NULL; 979 980 /* change directory */ 981 if (_ftp_cwd(cd, url->doc) == -1) 982 return NULL; 983 984 /* initiate the transfer */ 985 return _ftp_transfer(cd, CHECK_FLAG('a') ? "APPE" : "STOR", 986 url->doc, O_WRONLY, url->offset, flags); 987 } 988 989 /* 990 * Get file stats 991 */ 992 int 993 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 994 { 995 struct url *purl; 996 int cd; 997 998 /* get the proxy URL, and check if we should use HTTP instead */ 999 if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) { 1000 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 1001 FILE *f; 1002 1003 if ((f = _http_request(url, "HEAD", us, purl, flags)) == NULL) 1004 return -1; 1005 fclose(f); 1006 return 0; 1007 } 1008 } else { 1009 purl = NULL; 1010 } 1011 1012 /* connect to server */ 1013 cd = _ftp_cached_connect(url, purl, flags); 1014 if (purl) 1015 fetchFreeURL(purl); 1016 if (cd == NULL) 1017 return NULL; 1018 1019 /* change directory */ 1020 if (_ftp_cwd(cd, url->doc) == -1) 1021 return -1; 1022 1023 /* stat file */ 1024 return _ftp_stat(cd, url->doc, us); 1025 } 1026 1027 /* 1028 * List a directory 1029 */ 1030 struct url_ent * 1031 fetchListFTP(struct url *url __unused, const char *flags __unused) 1032 { 1033 warnx("fetchListFTP(): not implemented"); 1034 return NULL; 1035 } 1036