1 /* $NetBSD: fetch.c,v 1.183 2007/12/05 03:46:33 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1997-2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * This code is derived from software contributed to The NetBSD Foundation 11 * by Scott Aaron Bamford. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the NetBSD 24 * Foundation, Inc. and its contributors. 25 * 4. Neither the name of The NetBSD Foundation nor the names of its 26 * contributors may be used to endorse or promote products derived 27 * from this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 30 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 31 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 32 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 33 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 34 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 35 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 36 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 37 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 39 * POSSIBILITY OF SUCH DAMAGE. 40 */ 41 42 #include <sys/cdefs.h> 43 #ifndef lint 44 __RCSID("$NetBSD: fetch.c,v 1.183 2007/12/05 03:46:33 lukem Exp $"); 45 #endif /* not lint */ 46 47 /* 48 * FTP User Program -- Command line file retrieval 49 */ 50 51 #include <sys/types.h> 52 #include <sys/param.h> 53 #include <sys/socket.h> 54 #include <sys/stat.h> 55 #include <sys/time.h> 56 57 #include <netinet/in.h> 58 59 #include <arpa/ftp.h> 60 #include <arpa/inet.h> 61 62 #include <ctype.h> 63 #include <err.h> 64 #include <errno.h> 65 #include <netdb.h> 66 #include <fcntl.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <unistd.h> 71 #include <time.h> 72 73 #include "ftp_var.h" 74 #include "version.h" 75 76 typedef enum { 77 UNKNOWN_URL_T=-1, 78 HTTP_URL_T, 79 FTP_URL_T, 80 FILE_URL_T, 81 CLASSIC_URL_T 82 } url_t; 83 84 void aborthttp(int); 85 #ifndef NO_AUTH 86 static int auth_url(const char *, char **, const char *, const char *); 87 static void base64_encode(const unsigned char *, size_t, unsigned char *); 88 #endif 89 static int go_fetch(const char *); 90 static int fetch_ftp(const char *); 91 static int fetch_url(const char *, const char *, char *, char *); 92 static const char *match_token(const char **, const char *); 93 static int parse_url(const char *, const char *, url_t *, char **, 94 char **, char **, char **, in_port_t *, char **); 95 static void url_decode(char *); 96 97 static int redirect_loop; 98 99 100 #define STRNEQUAL(a,b) (strncasecmp((a), (b), sizeof((b))-1) == 0) 101 #define ISLWS(x) ((x)=='\r' || (x)=='\n' || (x)==' ' || (x)=='\t') 102 #define SKIPLWS(x) do { while (ISLWS((*x))) x++; } while (0) 103 104 105 #define ABOUT_URL "about:" /* propaganda */ 106 #define FILE_URL "file://" /* file URL prefix */ 107 #define FTP_URL "ftp://" /* ftp URL prefix */ 108 #define HTTP_URL "http://" /* http URL prefix */ 109 110 111 /* 112 * Determine if token is the next word in buf (case insensitive). 113 * If so, advance buf past the token and any trailing LWS, and 114 * return a pointer to the token (in buf). Otherwise, return NULL. 115 * token may be preceded by LWS. 116 * token must be followed by LWS or NUL. (I.e, don't partial match). 117 */ 118 static const char * 119 match_token(const char **buf, const char *token) 120 { 121 const char *p, *orig; 122 size_t tlen; 123 124 tlen = strlen(token); 125 p = *buf; 126 SKIPLWS(p); 127 orig = p; 128 if (strncasecmp(p, token, tlen) != 0) 129 return NULL; 130 p += tlen; 131 if (*p != '\0' && !ISLWS(*p)) 132 return NULL; 133 SKIPLWS(p); 134 orig = *buf; 135 *buf = p; 136 return orig; 137 } 138 139 #ifndef NO_AUTH 140 /* 141 * Generate authorization response based on given authentication challenge. 142 * Returns -1 if an error occurred, otherwise 0. 143 * Sets response to a malloc(3)ed string; caller should free. 144 */ 145 static int 146 auth_url(const char *challenge, char **response, const char *guser, 147 const char *gpass) 148 { 149 const char *cp, *scheme, *errormsg; 150 char *ep, *clear, *realm; 151 char user[BUFSIZ], *pass; 152 int rval; 153 size_t len, clen, rlen; 154 155 *response = NULL; 156 clear = realm = NULL; 157 rval = -1; 158 cp = challenge; 159 scheme = "Basic"; /* only support Basic authentication */ 160 161 DPRINTF("auth_url: challenge `%s'\n", challenge); 162 163 if (! match_token(&cp, scheme)) { 164 warnx("Unsupported authentication challenge `%s'", 165 challenge); 166 goto cleanup_auth_url; 167 } 168 169 #define REALM "realm=\"" 170 if (STRNEQUAL(cp, REALM)) 171 cp += sizeof(REALM) - 1; 172 else { 173 warnx("Unsupported authentication challenge `%s'", 174 challenge); 175 goto cleanup_auth_url; 176 } 177 /* XXX: need to improve quoted-string parsing to support \ quoting, etc. */ 178 if ((ep = strchr(cp, '\"')) != NULL) { 179 size_t len = ep - cp; 180 181 realm = (char *)ftp_malloc(len + 1); 182 (void)strlcpy(realm, cp, len + 1); 183 } else { 184 warnx("Unsupported authentication challenge `%s'", 185 challenge); 186 goto cleanup_auth_url; 187 } 188 189 fprintf(ttyout, "Username for `%s': ", realm); 190 if (guser != NULL) { 191 (void)strlcpy(user, guser, sizeof(user)); 192 fprintf(ttyout, "%s\n", user); 193 } else { 194 (void)fflush(ttyout); 195 if (getline(stdin, user, sizeof(user), &errormsg) < 0) { 196 warnx("%s; can't authenticate", errormsg); 197 goto cleanup_auth_url; 198 } 199 } 200 if (gpass != NULL) 201 pass = (char *)gpass; 202 else { 203 pass = getpass("Password: "); 204 if (pass == NULL) { 205 warnx("Can't read password"); 206 goto cleanup_auth_url; 207 } 208 } 209 210 clen = strlen(user) + strlen(pass) + 2; /* user + ":" + pass + "\0" */ 211 clear = (char *)ftp_malloc(clen); 212 (void)strlcpy(clear, user, clen); 213 (void)strlcat(clear, ":", clen); 214 (void)strlcat(clear, pass, clen); 215 if (gpass == NULL) 216 memset(pass, 0, strlen(pass)); 217 218 /* scheme + " " + enc + "\0" */ 219 rlen = strlen(scheme) + 1 + (clen + 2) * 4 / 3 + 1; 220 *response = (char *)ftp_malloc(rlen); 221 (void)strlcpy(*response, scheme, rlen); 222 len = strlcat(*response, " ", rlen); 223 /* use `clen - 1' to not encode the trailing NUL */ 224 base64_encode((unsigned char *)clear, clen - 1, 225 (unsigned char *)*response + len); 226 memset(clear, 0, clen); 227 rval = 0; 228 229 cleanup_auth_url: 230 FREEPTR(clear); 231 FREEPTR(realm); 232 return (rval); 233 } 234 235 /* 236 * Encode len bytes starting at clear using base64 encoding into encoded, 237 * which should be at least ((len + 2) * 4 / 3 + 1) in size. 238 */ 239 static void 240 base64_encode(const unsigned char *clear, size_t len, unsigned char *encoded) 241 { 242 static const unsigned char enc[] = 243 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 244 unsigned char *cp; 245 int i; 246 247 cp = encoded; 248 for (i = 0; i < len; i += 3) { 249 *(cp++) = enc[((clear[i + 0] >> 2))]; 250 *(cp++) = enc[((clear[i + 0] << 4) & 0x30) 251 | ((clear[i + 1] >> 4) & 0x0f)]; 252 *(cp++) = enc[((clear[i + 1] << 2) & 0x3c) 253 | ((clear[i + 2] >> 6) & 0x03)]; 254 *(cp++) = enc[((clear[i + 2] ) & 0x3f)]; 255 } 256 *cp = '\0'; 257 while (i-- > len) 258 *(--cp) = '='; 259 } 260 #endif 261 262 /* 263 * Decode %xx escapes in given string, `in-place'. 264 */ 265 static void 266 url_decode(char *url) 267 { 268 unsigned char *p, *q; 269 270 if (EMPTYSTRING(url)) 271 return; 272 p = q = (unsigned char *)url; 273 274 #define HEXTOINT(x) (x - (isdigit(x) ? '0' : (islower(x) ? 'a' : 'A') - 10)) 275 while (*p) { 276 if (p[0] == '%' 277 && p[1] && isxdigit((unsigned char)p[1]) 278 && p[2] && isxdigit((unsigned char)p[2])) { 279 *q++ = HEXTOINT(p[1]) * 16 + HEXTOINT(p[2]); 280 p+=3; 281 } else 282 *q++ = *p++; 283 } 284 *q = '\0'; 285 } 286 287 288 /* 289 * Parse URL of form (per RFC3986): 290 * <type>://[<user>[:<password>]@]<host>[:<port>][/<path>] 291 * Returns -1 if a parse error occurred, otherwise 0. 292 * It's the caller's responsibility to url_decode() the returned 293 * user, pass and path. 294 * 295 * Sets type to url_t, each of the given char ** pointers to a 296 * malloc(3)ed strings of the relevant section, and port to 297 * the number given, or ftpport if ftp://, or httpport if http://. 298 * 299 * XXX: this is not totally RFC3986 compliant; <path> will have the 300 * leading `/' unless it's an ftp:// URL, as this makes things easier 301 * for file:// and http:// URLs. ftp:// URLs have the `/' between the 302 * host and the URL-path removed, but any additional leading slashes 303 * in the URL-path are retained (because they imply that we should 304 * later do "CWD" with a null argument). 305 * 306 * Examples: 307 * input URL output path 308 * --------- ----------- 309 * "http://host" "/" 310 * "http://host/" "/" 311 * "http://host/path" "/path" 312 * "file://host/dir/file" "dir/file" 313 * "ftp://host" "" 314 * "ftp://host/" "" 315 * "ftp://host//" "/" 316 * "ftp://host/dir/file" "dir/file" 317 * "ftp://host//dir/file" "/dir/file" 318 */ 319 static int 320 parse_url(const char *url, const char *desc, url_t *type, 321 char **user, char **pass, char **host, char **port, 322 in_port_t *portnum, char **path) 323 { 324 const char *origurl; 325 char *cp, *ep, *thost, *tport; 326 size_t len; 327 328 if (url == NULL || desc == NULL || type == NULL || user == NULL 329 || pass == NULL || host == NULL || port == NULL || portnum == NULL 330 || path == NULL) 331 errx(1, "parse_url: invoked with NULL argument!"); 332 DPRINTF("parse_url: %s `%s'\n", desc, url); 333 334 origurl = url; 335 *type = UNKNOWN_URL_T; 336 *user = *pass = *host = *port = *path = NULL; 337 *portnum = 0; 338 tport = NULL; 339 340 if (STRNEQUAL(url, HTTP_URL)) { 341 url += sizeof(HTTP_URL) - 1; 342 *type = HTTP_URL_T; 343 *portnum = HTTP_PORT; 344 tport = httpport; 345 } else if (STRNEQUAL(url, FTP_URL)) { 346 url += sizeof(FTP_URL) - 1; 347 *type = FTP_URL_T; 348 *portnum = FTP_PORT; 349 tport = ftpport; 350 } else if (STRNEQUAL(url, FILE_URL)) { 351 url += sizeof(FILE_URL) - 1; 352 *type = FILE_URL_T; 353 } else { 354 warnx("Invalid %s `%s'", desc, url); 355 cleanup_parse_url: 356 FREEPTR(*user); 357 if (*pass != NULL) 358 memset(*pass, 0, strlen(*pass)); 359 FREEPTR(*pass); 360 FREEPTR(*host); 361 FREEPTR(*port); 362 FREEPTR(*path); 363 return (-1); 364 } 365 366 if (*url == '\0') 367 return (0); 368 369 /* find [user[:pass]@]host[:port] */ 370 ep = strchr(url, '/'); 371 if (ep == NULL) 372 thost = ftp_strdup(url); 373 else { 374 len = ep - url; 375 thost = (char *)ftp_malloc(len + 1); 376 (void)strlcpy(thost, url, len + 1); 377 if (*type == FTP_URL_T) /* skip first / for ftp URLs */ 378 ep++; 379 *path = ftp_strdup(ep); 380 } 381 382 cp = strchr(thost, '@'); /* look for user[:pass]@ in URLs */ 383 if (cp != NULL) { 384 if (*type == FTP_URL_T) 385 anonftp = 0; /* disable anonftp */ 386 *user = thost; 387 *cp = '\0'; 388 thost = ftp_strdup(cp + 1); 389 cp = strchr(*user, ':'); 390 if (cp != NULL) { 391 *cp = '\0'; 392 *pass = ftp_strdup(cp + 1); 393 } 394 url_decode(*user); 395 if (*pass) 396 url_decode(*pass); 397 } 398 399 #ifdef INET6 400 /* 401 * Check if thost is an encoded IPv6 address, as per 402 * RFC3986: 403 * `[' ipv6-address ']' 404 */ 405 if (*thost == '[') { 406 cp = thost + 1; 407 if ((ep = strchr(cp, ']')) == NULL || 408 (ep[1] != '\0' && ep[1] != ':')) { 409 warnx("Invalid address `%s' in %s `%s'", 410 thost, desc, origurl); 411 goto cleanup_parse_url; 412 } 413 len = ep - cp; /* change `[xyz]' -> `xyz' */ 414 memmove(thost, thost + 1, len); 415 thost[len] = '\0'; 416 if (! isipv6addr(thost)) { 417 warnx("Invalid IPv6 address `%s' in %s `%s'", 418 thost, desc, origurl); 419 goto cleanup_parse_url; 420 } 421 cp = ep + 1; 422 if (*cp == ':') 423 cp++; 424 else 425 cp = NULL; 426 } else 427 #endif /* INET6 */ 428 if ((cp = strchr(thost, ':')) != NULL) 429 *cp++ = '\0'; 430 *host = thost; 431 432 /* look for [:port] */ 433 if (cp != NULL) { 434 long nport; 435 436 nport = parseport(cp, -1); 437 if (nport == -1) { 438 warnx("Unknown port `%s' in %s `%s'", 439 cp, desc, origurl); 440 goto cleanup_parse_url; 441 } 442 *portnum = nport; 443 tport = cp; 444 } 445 446 if (tport != NULL) 447 *port = ftp_strdup(tport); 448 if (*path == NULL) { 449 const char *emptypath = "/"; 450 if (*type == FTP_URL_T) /* skip first / for ftp URLs */ 451 emptypath++; 452 *path = ftp_strdup(emptypath); 453 } 454 455 DPRINTF("parse_url: user `%s' pass `%s' host %s port %s(%d) " 456 "path `%s'\n", 457 STRorNULL(*user), STRorNULL(*pass), 458 STRorNULL(*host), STRorNULL(*port), 459 *portnum ? *portnum : -1, STRorNULL(*path)); 460 461 return (0); 462 } 463 464 sigjmp_buf httpabort; 465 466 /* 467 * Retrieve URL, via a proxy if necessary, using HTTP. 468 * If proxyenv is set, use that for the proxy, otherwise try ftp_proxy or 469 * http_proxy as appropriate. 470 * Supports HTTP redirects. 471 * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection 472 * is still open (e.g, ftp xfer with trailing /) 473 */ 474 static int 475 fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth) 476 { 477 struct addrinfo hints, *res, *res0 = NULL; 478 int error; 479 char hbuf[NI_MAXHOST]; 480 sigfunc volatile oldintr; 481 sigfunc volatile oldintp; 482 int volatile s; 483 struct stat sb; 484 int volatile ischunked; 485 int volatile isproxy; 486 int volatile rval; 487 int volatile hcode; 488 size_t len; 489 static size_t bufsize; 490 static char *xferbuf; 491 const char *cp, *token; 492 char *ep; 493 char buf[FTPBUFLEN]; 494 const char *errormsg; 495 char *volatile savefile; 496 char *volatile auth; 497 char *volatile location; 498 char *volatile message; 499 char *user, *pass, *host, *port, *path; 500 char *volatile decodedpath; 501 char *puser, *ppass, *useragent; 502 off_t hashbytes, rangestart, rangeend, entitylen; 503 int (*volatile closefunc)(FILE *); 504 FILE *volatile fin; 505 FILE *volatile fout; 506 time_t mtime; 507 url_t urltype; 508 in_port_t portnum; 509 510 DPRINTF("fetch_url: `%s' proxyenv `%s'\n", url, STRorNULL(proxyenv)); 511 512 oldintr = oldintp = NULL; 513 closefunc = NULL; 514 fin = fout = NULL; 515 s = -1; 516 savefile = NULL; 517 auth = location = message = NULL; 518 ischunked = isproxy = hcode = 0; 519 rval = 1; 520 user = pass = host = path = decodedpath = puser = ppass = NULL; 521 522 if (parse_url(url, "URL", &urltype, &user, &pass, &host, &port, 523 &portnum, &path) == -1) 524 goto cleanup_fetch_url; 525 526 if (urltype == FILE_URL_T && ! EMPTYSTRING(host) 527 && strcasecmp(host, "localhost") != 0) { 528 warnx("No support for non local file URL `%s'", url); 529 goto cleanup_fetch_url; 530 } 531 532 if (EMPTYSTRING(path)) { 533 if (urltype == FTP_URL_T) { 534 rval = fetch_ftp(url); 535 goto cleanup_fetch_url; 536 } 537 if (urltype != HTTP_URL_T || outfile == NULL) { 538 warnx("Invalid URL (no file after host) `%s'", url); 539 goto cleanup_fetch_url; 540 } 541 } 542 543 decodedpath = ftp_strdup(path); 544 url_decode(decodedpath); 545 546 if (outfile) 547 savefile = ftp_strdup(outfile); 548 else { 549 cp = strrchr(decodedpath, '/'); /* find savefile */ 550 if (cp != NULL) 551 savefile = ftp_strdup(cp + 1); 552 else 553 savefile = ftp_strdup(decodedpath); 554 } 555 DPRINTF("fetch_url: savefile `%s'\n", savefile); 556 if (EMPTYSTRING(savefile)) { 557 if (urltype == FTP_URL_T) { 558 rval = fetch_ftp(url); 559 goto cleanup_fetch_url; 560 } 561 warnx("No file after directory (you must specify an " 562 "output file) `%s'", url); 563 goto cleanup_fetch_url; 564 } 565 566 restart_point = 0; 567 filesize = -1; 568 rangestart = rangeend = entitylen = -1; 569 mtime = -1; 570 if (restartautofetch) { 571 if (strcmp(savefile, "-") != 0 && *savefile != '|' && 572 stat(savefile, &sb) == 0) 573 restart_point = sb.st_size; 574 } 575 if (urltype == FILE_URL_T) { /* file:// URLs */ 576 direction = "copied"; 577 fin = fopen(decodedpath, "r"); 578 if (fin == NULL) { 579 warn("Can't open `%s'", decodedpath); 580 goto cleanup_fetch_url; 581 } 582 if (fstat(fileno(fin), &sb) == 0) { 583 mtime = sb.st_mtime; 584 filesize = sb.st_size; 585 } 586 if (restart_point) { 587 if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 588 warn("Can't seek to restart `%s'", 589 decodedpath); 590 goto cleanup_fetch_url; 591 } 592 } 593 if (verbose) { 594 fprintf(ttyout, "Copying %s", decodedpath); 595 if (restart_point) 596 fprintf(ttyout, " (restarting at " LLF ")", 597 (LLT)restart_point); 598 fputs("\n", ttyout); 599 } 600 } else { /* ftp:// or http:// URLs */ 601 char *leading; 602 int hasleading; 603 604 if (proxyenv == NULL) { 605 if (urltype == HTTP_URL_T) 606 proxyenv = getoptionvalue("http_proxy"); 607 else if (urltype == FTP_URL_T) 608 proxyenv = getoptionvalue("ftp_proxy"); 609 } 610 direction = "retrieved"; 611 if (! EMPTYSTRING(proxyenv)) { /* use proxy */ 612 url_t purltype; 613 char *phost, *ppath; 614 char *pport, *no_proxy; 615 616 isproxy = 1; 617 618 /* check URL against list of no_proxied sites */ 619 no_proxy = getoptionvalue("no_proxy"); 620 if (! EMPTYSTRING(no_proxy)) { 621 char *np, *np_copy, *np_iter; 622 long np_port; 623 size_t hlen, plen; 624 625 np_iter = np_copy = ftp_strdup(no_proxy); 626 hlen = strlen(host); 627 while ((cp = strsep(&np_iter, " ,")) != NULL) { 628 if (*cp == '\0') 629 continue; 630 if ((np = strrchr(cp, ':')) != NULL) { 631 *np = '\0'; 632 np_port = 633 strtol(np + 1, &ep, 10); 634 if (*ep != '\0') 635 continue; 636 if (np_port != portnum) 637 continue; 638 } 639 plen = strlen(cp); 640 if (hlen < plen) 641 continue; 642 if (strncasecmp(host + hlen - plen, 643 cp, plen) == 0) { 644 isproxy = 0; 645 break; 646 } 647 } 648 FREEPTR(np_copy); 649 if (isproxy == 0 && urltype == FTP_URL_T) { 650 rval = fetch_ftp(url); 651 goto cleanup_fetch_url; 652 } 653 } 654 655 if (isproxy) { 656 if (restart_point) { 657 warnx("Can't restart via proxy URL `%s'", 658 proxyenv); 659 goto cleanup_fetch_url; 660 } 661 if (parse_url(proxyenv, "proxy URL", &purltype, 662 &puser, &ppass, &phost, &pport, &portnum, 663 &ppath) == -1) 664 goto cleanup_fetch_url; 665 666 if ((purltype != HTTP_URL_T 667 && purltype != FTP_URL_T) || 668 EMPTYSTRING(phost) || 669 (! EMPTYSTRING(ppath) 670 && strcmp(ppath, "/") != 0)) { 671 warnx("Malformed proxy URL `%s'", 672 proxyenv); 673 FREEPTR(phost); 674 FREEPTR(pport); 675 FREEPTR(ppath); 676 goto cleanup_fetch_url; 677 } 678 if (isipv6addr(host) && 679 strchr(host, '%') != NULL) { 680 warnx( 681 "Scoped address notation `%s' disallowed via web proxy", 682 host); 683 FREEPTR(phost); 684 FREEPTR(pport); 685 FREEPTR(ppath); 686 goto cleanup_fetch_url; 687 } 688 689 FREEPTR(host); 690 host = phost; 691 FREEPTR(port); 692 port = pport; 693 FREEPTR(path); 694 path = ftp_strdup(url); 695 FREEPTR(ppath); 696 } 697 } /* ! EMPTYSTRING(proxyenv) */ 698 699 memset(&hints, 0, sizeof(hints)); 700 hints.ai_flags = 0; 701 hints.ai_family = family; 702 hints.ai_socktype = SOCK_STREAM; 703 hints.ai_protocol = 0; 704 error = getaddrinfo(host, NULL, &hints, &res0); 705 if (error) { 706 warnx("Can't lookup `%s': %s", host, 707 (error == EAI_SYSTEM) ? strerror(errno) 708 : gai_strerror(error)); 709 goto cleanup_fetch_url; 710 } 711 if (res0->ai_canonname) 712 host = res0->ai_canonname; 713 714 s = -1; 715 for (res = res0; res; res = res->ai_next) { 716 ai_unmapped(res); 717 if (getnameinfo(res->ai_addr, res->ai_addrlen, 718 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 719 strlcpy(hbuf, "?", sizeof(hbuf)); 720 721 if (verbose && res0->ai_next) { 722 fprintf(ttyout, "Trying %s...\n", hbuf); 723 } 724 725 ((struct sockaddr_in *)res->ai_addr)->sin_port = 726 htons(portnum); 727 s = socket(res->ai_family, SOCK_STREAM, 728 res->ai_protocol); 729 if (s < 0) { 730 warn( 731 "Can't create socket for connection to `%s'", 732 hbuf); 733 continue; 734 } 735 736 if (ftp_connect(s, res->ai_addr, res->ai_addrlen) < 0) { 737 close(s); 738 s = -1; 739 continue; 740 } 741 742 /* success */ 743 break; 744 } 745 746 if (s < 0) { 747 warnx("Can't connect to `%s'", host); 748 goto cleanup_fetch_url; 749 } 750 751 fin = fdopen(s, "r+"); 752 /* 753 * Construct and send the request. 754 */ 755 if (verbose) 756 fprintf(ttyout, "Requesting %s\n", url); 757 leading = " ("; 758 hasleading = 0; 759 if (isproxy) { 760 if (verbose) { 761 fprintf(ttyout, "%svia %s:%s", leading, 762 host, port); 763 leading = ", "; 764 hasleading++; 765 } 766 fprintf(fin, "GET %s HTTP/1.0\r\n", path); 767 if (flushcache) 768 fprintf(fin, "Pragma: no-cache\r\n"); 769 } else { 770 fprintf(fin, "GET %s HTTP/1.1\r\n", path); 771 if (strchr(host, ':')) { 772 char *h, *p; 773 774 /* 775 * strip off IPv6 scope identifier, since it is 776 * local to the node 777 */ 778 h = ftp_strdup(host); 779 if (isipv6addr(h) && 780 (p = strchr(h, '%')) != NULL) { 781 *p = '\0'; 782 } 783 fprintf(fin, "Host: [%s]", h); 784 free(h); 785 } else 786 fprintf(fin, "Host: %s", host); 787 if (portnum != HTTP_PORT) 788 fprintf(fin, ":%u", portnum); 789 fprintf(fin, "\r\n"); 790 fprintf(fin, "Accept: */*\r\n"); 791 fprintf(fin, "Connection: close\r\n"); 792 if (restart_point) { 793 fputs(leading, ttyout); 794 fprintf(fin, "Range: bytes=" LLF "-\r\n", 795 (LLT)restart_point); 796 fprintf(ttyout, "restarting at " LLF, 797 (LLT)restart_point); 798 leading = ", "; 799 hasleading++; 800 } 801 if (flushcache) 802 fprintf(fin, "Cache-Control: no-cache\r\n"); 803 } 804 if ((useragent=getenv("FTPUSERAGENT")) != NULL) { 805 fprintf(fin, "User-Agent: %s\r\n", useragent); 806 } else { 807 fprintf(fin, "User-Agent: %s/%s\r\n", 808 FTP_PRODUCT, FTP_VERSION); 809 } 810 if (wwwauth) { 811 if (verbose) { 812 fprintf(ttyout, "%swith authorization", 813 leading); 814 leading = ", "; 815 hasleading++; 816 } 817 fprintf(fin, "Authorization: %s\r\n", wwwauth); 818 } 819 if (proxyauth) { 820 if (verbose) { 821 fprintf(ttyout, 822 "%swith proxy authorization", leading); 823 leading = ", "; 824 hasleading++; 825 } 826 fprintf(fin, "Proxy-Authorization: %s\r\n", proxyauth); 827 } 828 if (verbose && hasleading) 829 fputs(")\n", ttyout); 830 fprintf(fin, "\r\n"); 831 if (fflush(fin) == EOF) { 832 warn("Writing HTTP request"); 833 goto cleanup_fetch_url; 834 } 835 836 /* Read the response */ 837 len = getline(fin, buf, sizeof(buf), &errormsg); 838 if (len < 0) { 839 if (*errormsg == '\n') 840 errormsg++; 841 warnx("Receiving HTTP reply: %s", errormsg); 842 goto cleanup_fetch_url; 843 } 844 while (len > 0 && (ISLWS(buf[len-1]))) 845 buf[--len] = '\0'; 846 DPRINTF("fetch_url: received `%s'\n", buf); 847 848 /* Determine HTTP response code */ 849 cp = strchr(buf, ' '); 850 if (cp == NULL) 851 goto improper; 852 else 853 cp++; 854 hcode = strtol(cp, &ep, 10); 855 if (*ep != '\0' && !isspace((unsigned char)*ep)) 856 goto improper; 857 message = ftp_strdup(cp); 858 859 /* Read the rest of the header. */ 860 while (1) { 861 len = getline(fin, buf, sizeof(buf), &errormsg); 862 if (len < 0) { 863 if (*errormsg == '\n') 864 errormsg++; 865 warnx("Receiving HTTP reply: %s", errormsg); 866 goto cleanup_fetch_url; 867 } 868 while (len > 0 && (ISLWS(buf[len-1]))) 869 buf[--len] = '\0'; 870 if (len == 0) 871 break; 872 DPRINTF("fetch_url: received `%s'\n", buf); 873 874 /* 875 * Look for some headers 876 */ 877 878 cp = buf; 879 880 if (match_token(&cp, "Content-Length:")) { 881 filesize = STRTOLL(cp, &ep, 10); 882 if (filesize < 0 || *ep != '\0') 883 goto improper; 884 DPRINTF("fetch_url: parsed len as: " LLF "\n", 885 (LLT)filesize); 886 887 } else if (match_token(&cp, "Content-Range:")) { 888 if (! match_token(&cp, "bytes")) 889 goto improper; 890 891 if (*cp == '*') 892 cp++; 893 else { 894 rangestart = STRTOLL(cp, &ep, 10); 895 if (rangestart < 0 || *ep != '-') 896 goto improper; 897 cp = ep + 1; 898 rangeend = STRTOLL(cp, &ep, 10); 899 if (rangeend < 0 || rangeend < rangestart) 900 goto improper; 901 cp = ep; 902 } 903 if (*cp != '/') 904 goto improper; 905 cp++; 906 if (*cp == '*') 907 cp++; 908 else { 909 entitylen = STRTOLL(cp, &ep, 10); 910 if (entitylen < 0) 911 goto improper; 912 cp = ep; 913 } 914 if (*cp != '\0') 915 goto improper; 916 917 #ifndef NO_DEBUG 918 if (ftp_debug) { 919 fprintf(ttyout, "parsed range as: "); 920 if (rangestart == -1) 921 fprintf(ttyout, "*"); 922 else 923 fprintf(ttyout, LLF "-" LLF, 924 (LLT)rangestart, 925 (LLT)rangeend); 926 fprintf(ttyout, "/" LLF "\n", (LLT)entitylen); 927 } 928 #endif 929 if (! restart_point) { 930 warnx( 931 "Received unexpected Content-Range header"); 932 goto cleanup_fetch_url; 933 } 934 935 } else if (match_token(&cp, "Last-Modified:")) { 936 struct tm parsed; 937 char *t; 938 939 memset(&parsed, 0, sizeof(parsed)); 940 /* RFC1123 */ 941 if ((t = strptime(cp, 942 "%a, %d %b %Y %H:%M:%S GMT", 943 &parsed)) 944 /* RFC0850 */ 945 || (t = strptime(cp, 946 "%a, %d-%b-%y %H:%M:%S GMT", 947 &parsed)) 948 /* asctime */ 949 || (t = strptime(cp, 950 "%a, %b %d %H:%M:%S %Y", 951 &parsed))) { 952 parsed.tm_isdst = -1; 953 if (*t == '\0') 954 mtime = timegm(&parsed); 955 #ifndef NO_DEBUG 956 if (ftp_debug && mtime != -1) { 957 fprintf(ttyout, 958 "parsed date as: %s", 959 rfc2822time(localtime(&mtime))); 960 } 961 #endif 962 } 963 964 } else if (match_token(&cp, "Location:")) { 965 location = ftp_strdup(cp); 966 DPRINTF("fetch_url: parsed location as `%s'\n", 967 cp); 968 969 } else if (match_token(&cp, "Transfer-Encoding:")) { 970 if (match_token(&cp, "binary")) { 971 warnx( 972 "Bogus transfer encoding `binary' (fetching anyway)"); 973 continue; 974 } 975 if (! (token = match_token(&cp, "chunked"))) { 976 warnx( 977 "Unsupported transfer encoding `%s'", 978 token); 979 goto cleanup_fetch_url; 980 } 981 ischunked++; 982 DPRINTF("fetch_url: using chunked encoding\n"); 983 984 } else if (match_token(&cp, "Proxy-Authenticate:") 985 || match_token(&cp, "WWW-Authenticate:")) { 986 if (! (token = match_token(&cp, "Basic"))) { 987 DPRINTF( 988 "fetch_url: skipping unknown auth scheme `%s'\n", 989 token); 990 continue; 991 } 992 FREEPTR(auth); 993 auth = ftp_strdup(token); 994 DPRINTF("fetch_url: parsed auth as `%s'\n", cp); 995 } 996 997 } 998 /* finished parsing header */ 999 1000 switch (hcode) { 1001 case 200: 1002 break; 1003 case 206: 1004 if (! restart_point) { 1005 warnx("Not expecting partial content header"); 1006 goto cleanup_fetch_url; 1007 } 1008 break; 1009 case 300: 1010 case 301: 1011 case 302: 1012 case 303: 1013 case 305: 1014 case 307: 1015 if (EMPTYSTRING(location)) { 1016 warnx( 1017 "No redirection Location provided by server"); 1018 goto cleanup_fetch_url; 1019 } 1020 if (redirect_loop++ > 5) { 1021 warnx("Too many redirections requested"); 1022 goto cleanup_fetch_url; 1023 } 1024 if (hcode == 305) { 1025 if (verbose) 1026 fprintf(ttyout, "Redirected via %s\n", 1027 location); 1028 rval = fetch_url(url, location, 1029 proxyauth, wwwauth); 1030 } else { 1031 if (verbose) 1032 fprintf(ttyout, "Redirected to %s\n", 1033 location); 1034 rval = go_fetch(location); 1035 } 1036 goto cleanup_fetch_url; 1037 #ifndef NO_AUTH 1038 case 401: 1039 case 407: 1040 { 1041 char **authp; 1042 char *auser, *apass; 1043 1044 if (hcode == 401) { 1045 authp = &wwwauth; 1046 auser = user; 1047 apass = pass; 1048 } else { 1049 authp = &proxyauth; 1050 auser = puser; 1051 apass = ppass; 1052 } 1053 if (verbose || *authp == NULL || 1054 auser == NULL || apass == NULL) 1055 fprintf(ttyout, "%s\n", message); 1056 if (EMPTYSTRING(auth)) { 1057 warnx( 1058 "No authentication challenge provided by server"); 1059 goto cleanup_fetch_url; 1060 } 1061 if (*authp != NULL) { 1062 char reply[10]; 1063 1064 fprintf(ttyout, 1065 "Authorization failed. Retry (y/n)? "); 1066 if (getline(stdin, reply, sizeof(reply), NULL) 1067 < 0) { 1068 goto cleanup_fetch_url; 1069 } 1070 if (tolower((unsigned char)reply[0]) != 'y') 1071 goto cleanup_fetch_url; 1072 auser = NULL; 1073 apass = NULL; 1074 } 1075 if (auth_url(auth, authp, auser, apass) == 0) { 1076 rval = fetch_url(url, proxyenv, 1077 proxyauth, wwwauth); 1078 memset(*authp, 0, strlen(*authp)); 1079 FREEPTR(*authp); 1080 } 1081 goto cleanup_fetch_url; 1082 } 1083 #endif 1084 default: 1085 if (message) 1086 warnx("Error retrieving file `%s'", message); 1087 else 1088 warnx("Unknown error retrieving file"); 1089 goto cleanup_fetch_url; 1090 } 1091 } /* end of ftp:// or http:// specific setup */ 1092 1093 /* Open the output file. */ 1094 if (strcmp(savefile, "-") == 0) { 1095 fout = stdout; 1096 } else if (*savefile == '|') { 1097 oldintp = xsignal(SIGPIPE, SIG_IGN); 1098 fout = popen(savefile + 1, "w"); 1099 if (fout == NULL) { 1100 warn("Can't execute `%s'", savefile + 1); 1101 goto cleanup_fetch_url; 1102 } 1103 closefunc = pclose; 1104 } else { 1105 if ((rangeend != -1 && rangeend <= restart_point) || 1106 (rangestart == -1 && filesize != -1 && filesize <= restart_point)) { 1107 /* already done */ 1108 if (verbose) 1109 fprintf(ttyout, "already done\n"); 1110 rval = 0; 1111 goto cleanup_fetch_url; 1112 } 1113 if (restart_point && rangestart != -1) { 1114 if (entitylen != -1) 1115 filesize = entitylen; 1116 if (rangestart != restart_point) { 1117 warnx( 1118 "Size of `%s' differs from save file `%s'", 1119 url, savefile); 1120 goto cleanup_fetch_url; 1121 } 1122 fout = fopen(savefile, "a"); 1123 } else 1124 fout = fopen(savefile, "w"); 1125 if (fout == NULL) { 1126 warn("Can't open `%s'", savefile); 1127 goto cleanup_fetch_url; 1128 } 1129 closefunc = fclose; 1130 } 1131 1132 /* Trap signals */ 1133 if (sigsetjmp(httpabort, 1)) 1134 goto cleanup_fetch_url; 1135 (void)xsignal(SIGQUIT, psummary); 1136 oldintr = xsignal(SIGINT, aborthttp); 1137 1138 if (rcvbuf_size > bufsize) { 1139 if (xferbuf) 1140 (void)free(xferbuf); 1141 bufsize = rcvbuf_size; 1142 xferbuf = ftp_malloc(bufsize); 1143 } 1144 1145 bytes = 0; 1146 hashbytes = mark; 1147 progressmeter(-1); 1148 1149 /* Finally, suck down the file. */ 1150 do { 1151 long chunksize; 1152 short lastchunk; 1153 1154 chunksize = 0; 1155 lastchunk = 0; 1156 /* read chunk-size */ 1157 if (ischunked) { 1158 if (fgets(xferbuf, bufsize, fin) == NULL) { 1159 warnx("Unexpected EOF reading chunk-size"); 1160 goto cleanup_fetch_url; 1161 } 1162 errno = 0; 1163 chunksize = strtol(xferbuf, &ep, 16); 1164 if (ep == xferbuf) { 1165 warnx("Invalid chunk-size"); 1166 goto cleanup_fetch_url; 1167 } 1168 if (errno == ERANGE || chunksize < 0) { 1169 errno = ERANGE; 1170 warn("Chunk-size `%.*s'", 1171 (int)(ep-xferbuf), xferbuf); 1172 goto cleanup_fetch_url; 1173 } 1174 1175 /* 1176 * XXX: Work around bug in Apache 1.3.9 and 1177 * 1.3.11, which incorrectly put trailing 1178 * space after the chunk-size. 1179 */ 1180 while (*ep == ' ') 1181 ep++; 1182 1183 /* skip [ chunk-ext ] */ 1184 if (*ep == ';') { 1185 while (*ep && *ep != '\r') 1186 ep++; 1187 } 1188 1189 if (strcmp(ep, "\r\n") != 0) { 1190 warnx("Unexpected data following chunk-size"); 1191 goto cleanup_fetch_url; 1192 } 1193 DPRINTF("fetch_url: got chunk-size of " LLF "\n", 1194 (LLT)chunksize); 1195 if (chunksize == 0) { 1196 lastchunk = 1; 1197 goto chunkdone; 1198 } 1199 } 1200 /* transfer file or chunk */ 1201 while (1) { 1202 struct timeval then, now, td; 1203 off_t bufrem; 1204 1205 if (rate_get) 1206 (void)gettimeofday(&then, NULL); 1207 bufrem = rate_get ? rate_get : bufsize; 1208 if (ischunked) 1209 bufrem = MIN(chunksize, bufrem); 1210 while (bufrem > 0) { 1211 len = fread(xferbuf, sizeof(char), 1212 MIN(bufsize, bufrem), fin); 1213 if (len <= 0) 1214 goto chunkdone; 1215 bytes += len; 1216 bufrem -= len; 1217 if (fwrite(xferbuf, sizeof(char), len, fout) 1218 != len) { 1219 warn("Writing `%s'", savefile); 1220 goto cleanup_fetch_url; 1221 } 1222 if (hash && !progress) { 1223 while (bytes >= hashbytes) { 1224 (void)putc('#', ttyout); 1225 hashbytes += mark; 1226 } 1227 (void)fflush(ttyout); 1228 } 1229 if (ischunked) { 1230 chunksize -= len; 1231 if (chunksize <= 0) 1232 break; 1233 } 1234 } 1235 if (rate_get) { 1236 while (1) { 1237 (void)gettimeofday(&now, NULL); 1238 timersub(&now, &then, &td); 1239 if (td.tv_sec > 0) 1240 break; 1241 usleep(1000000 - td.tv_usec); 1242 } 1243 } 1244 if (ischunked && chunksize <= 0) 1245 break; 1246 } 1247 /* read CRLF after chunk*/ 1248 chunkdone: 1249 if (ischunked) { 1250 if (fgets(xferbuf, bufsize, fin) == NULL) { 1251 warnx("Unexpected EOF reading chunk CRLF"); 1252 goto cleanup_fetch_url; 1253 } 1254 if (strcmp(xferbuf, "\r\n") != 0) { 1255 warnx("Unexpected data following chunk"); 1256 goto cleanup_fetch_url; 1257 } 1258 if (lastchunk) 1259 break; 1260 } 1261 } while (ischunked); 1262 1263 /* XXX: deal with optional trailer & CRLF here? */ 1264 1265 if (hash && !progress && bytes > 0) { 1266 if (bytes < mark) 1267 (void)putc('#', ttyout); 1268 (void)putc('\n', ttyout); 1269 } 1270 if (ferror(fin)) { 1271 warn("Reading file"); 1272 goto cleanup_fetch_url; 1273 } 1274 progressmeter(1); 1275 (void)fflush(fout); 1276 if (closefunc == fclose && mtime != -1) { 1277 struct timeval tval[2]; 1278 1279 (void)gettimeofday(&tval[0], NULL); 1280 tval[1].tv_sec = mtime; 1281 tval[1].tv_usec = 0; 1282 (*closefunc)(fout); 1283 fout = NULL; 1284 1285 if (utimes(savefile, tval) == -1) { 1286 fprintf(ttyout, 1287 "Can't change modification time to %s", 1288 rfc2822time(localtime(&mtime))); 1289 } 1290 } 1291 if (bytes > 0) 1292 ptransfer(0); 1293 bytes = 0; 1294 1295 rval = 0; 1296 goto cleanup_fetch_url; 1297 1298 improper: 1299 warnx("Improper response from `%s'", host); 1300 1301 cleanup_fetch_url: 1302 if (oldintr) 1303 (void)xsignal(SIGINT, oldintr); 1304 if (oldintp) 1305 (void)xsignal(SIGPIPE, oldintp); 1306 if (fin != NULL) 1307 fclose(fin); 1308 else if (s != -1) 1309 close(s); 1310 if (closefunc != NULL && fout != NULL) 1311 (*closefunc)(fout); 1312 if (res0) 1313 freeaddrinfo(res0); 1314 FREEPTR(savefile); 1315 FREEPTR(user); 1316 if (pass != NULL) 1317 memset(pass, 0, strlen(pass)); 1318 FREEPTR(pass); 1319 FREEPTR(host); 1320 FREEPTR(port); 1321 FREEPTR(path); 1322 FREEPTR(decodedpath); 1323 FREEPTR(puser); 1324 if (ppass != NULL) 1325 memset(ppass, 0, strlen(ppass)); 1326 FREEPTR(ppass); 1327 FREEPTR(auth); 1328 FREEPTR(location); 1329 FREEPTR(message); 1330 return (rval); 1331 } 1332 1333 /* 1334 * Abort a HTTP retrieval 1335 */ 1336 void 1337 aborthttp(int notused) 1338 { 1339 char msgbuf[100]; 1340 size_t len; 1341 1342 sigint_raised = 1; 1343 alarmtimer(0); 1344 len = strlcpy(msgbuf, "\nHTTP fetch aborted.\n", sizeof(msgbuf)); 1345 write(fileno(ttyout), msgbuf, len); 1346 siglongjmp(httpabort, 1); 1347 } 1348 1349 /* 1350 * Retrieve ftp URL or classic ftp argument using FTP. 1351 * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection 1352 * is still open (e.g, ftp xfer with trailing /) 1353 */ 1354 static int 1355 fetch_ftp(const char *url) 1356 { 1357 char *cp, *xargv[5], rempath[MAXPATHLEN]; 1358 char *host, *path, *dir, *file, *user, *pass; 1359 char *port; 1360 int dirhasglob, filehasglob, rval, type, xargc; 1361 int oanonftp, oautologin; 1362 in_port_t portnum; 1363 url_t urltype; 1364 1365 DPRINTF("fetch_ftp: `%s'\n", url); 1366 host = path = dir = file = user = pass = NULL; 1367 port = NULL; 1368 rval = 1; 1369 type = TYPE_I; 1370 1371 if (STRNEQUAL(url, FTP_URL)) { 1372 if ((parse_url(url, "URL", &urltype, &user, &pass, 1373 &host, &port, &portnum, &path) == -1) || 1374 (user != NULL && *user == '\0') || 1375 EMPTYSTRING(host)) { 1376 warnx("Invalid URL `%s'", url); 1377 goto cleanup_fetch_ftp; 1378 } 1379 /* 1380 * Note: Don't url_decode(path) here. We need to keep the 1381 * distinction between "/" and "%2F" until later. 1382 */ 1383 1384 /* check for trailing ';type=[aid]' */ 1385 if (! EMPTYSTRING(path) && (cp = strrchr(path, ';')) != NULL) { 1386 if (strcasecmp(cp, ";type=a") == 0) 1387 type = TYPE_A; 1388 else if (strcasecmp(cp, ";type=i") == 0) 1389 type = TYPE_I; 1390 else if (strcasecmp(cp, ";type=d") == 0) { 1391 warnx( 1392 "Directory listing via a URL is not supported"); 1393 goto cleanup_fetch_ftp; 1394 } else { 1395 warnx("Invalid suffix `%s' in URL `%s'", cp, 1396 url); 1397 goto cleanup_fetch_ftp; 1398 } 1399 *cp = 0; 1400 } 1401 } else { /* classic style `[user@]host:[file]' */ 1402 urltype = CLASSIC_URL_T; 1403 host = ftp_strdup(url); 1404 cp = strchr(host, '@'); 1405 if (cp != NULL) { 1406 *cp = '\0'; 1407 user = host; 1408 anonftp = 0; /* disable anonftp */ 1409 host = ftp_strdup(cp + 1); 1410 } 1411 cp = strchr(host, ':'); 1412 if (cp != NULL) { 1413 *cp = '\0'; 1414 path = ftp_strdup(cp + 1); 1415 } 1416 } 1417 if (EMPTYSTRING(host)) 1418 goto cleanup_fetch_ftp; 1419 1420 /* Extract the file and (if present) directory name. */ 1421 dir = path; 1422 if (! EMPTYSTRING(dir)) { 1423 /* 1424 * If we are dealing with classic `[user@]host:[path]' syntax, 1425 * then a path of the form `/file' (resulting from input of the 1426 * form `host:/file') means that we should do "CWD /" before 1427 * retrieving the file. So we set dir="/" and file="file". 1428 * 1429 * But if we are dealing with URLs like `ftp://host/path' then 1430 * a path of the form `/file' (resulting from a URL of the form 1431 * `ftp://host//file') means that we should do `CWD ' (with an 1432 * empty argument) before retrieving the file. So we set 1433 * dir="" and file="file". 1434 * 1435 * If the path does not contain / at all, we set dir=NULL. 1436 * (We get a path without any slashes if we are dealing with 1437 * classic `[user@]host:[file]' or URL `ftp://host/file'.) 1438 * 1439 * In all other cases, we set dir to a string that does not 1440 * include the final '/' that separates the dir part from the 1441 * file part of the path. (This will be the empty string if 1442 * and only if we are dealing with a path of the form `/file' 1443 * resulting from an URL of the form `ftp://host//file'.) 1444 */ 1445 cp = strrchr(dir, '/'); 1446 if (cp == dir && urltype == CLASSIC_URL_T) { 1447 file = cp + 1; 1448 dir = "/"; 1449 } else if (cp != NULL) { 1450 *cp++ = '\0'; 1451 file = cp; 1452 } else { 1453 file = dir; 1454 dir = NULL; 1455 } 1456 } else 1457 dir = NULL; 1458 if (urltype == FTP_URL_T && file != NULL) { 1459 url_decode(file); 1460 /* but still don't url_decode(dir) */ 1461 } 1462 DPRINTF("fetch_ftp: user `%s' pass `%s' host %s port %s " 1463 "path `%s' dir `%s' file `%s'\n", 1464 STRorNULL(user), STRorNULL(pass), 1465 STRorNULL(host), STRorNULL(port), 1466 STRorNULL(path), STRorNULL(dir), STRorNULL(file)); 1467 1468 dirhasglob = filehasglob = 0; 1469 if (doglob && urltype == CLASSIC_URL_T) { 1470 if (! EMPTYSTRING(dir) && strpbrk(dir, "*?[]{}") != NULL) 1471 dirhasglob = 1; 1472 if (! EMPTYSTRING(file) && strpbrk(file, "*?[]{}") != NULL) 1473 filehasglob = 1; 1474 } 1475 1476 /* Set up the connection */ 1477 oanonftp = anonftp; 1478 if (connected) 1479 disconnect(0, NULL); 1480 anonftp = oanonftp; 1481 xargv[0] = (char *)getprogname(); /* XXX discards const */ 1482 xargv[1] = host; 1483 xargv[2] = NULL; 1484 xargc = 2; 1485 if (port) { 1486 xargv[2] = port; 1487 xargv[3] = NULL; 1488 xargc = 3; 1489 } 1490 oautologin = autologin; 1491 /* don't autologin in setpeer(), use ftp_login() below */ 1492 autologin = 0; 1493 setpeer(xargc, xargv); 1494 autologin = oautologin; 1495 if ((connected == 0) || 1496 (connected == 1 && !ftp_login(host, user, pass))) { 1497 warnx("Can't connect or login to host `%s'", host); 1498 goto cleanup_fetch_ftp; 1499 } 1500 1501 switch (type) { 1502 case TYPE_A: 1503 setascii(1, xargv); 1504 break; 1505 case TYPE_I: 1506 setbinary(1, xargv); 1507 break; 1508 default: 1509 errx(1, "fetch_ftp: unknown transfer type %d", type); 1510 } 1511 1512 /* 1513 * Change directories, if necessary. 1514 * 1515 * Note: don't use EMPTYSTRING(dir) below, because 1516 * dir=="" means something different from dir==NULL. 1517 */ 1518 if (dir != NULL && !dirhasglob) { 1519 char *nextpart; 1520 1521 /* 1522 * If we are dealing with a classic `[user@]host:[path]' 1523 * (urltype is CLASSIC_URL_T) then we have a raw directory 1524 * name (not encoded in any way) and we can change 1525 * directories in one step. 1526 * 1527 * If we are dealing with an `ftp://host/path' URL 1528 * (urltype is FTP_URL_T), then RFC3986 says we need to 1529 * send a separate CWD command for each unescaped "/" 1530 * in the path, and we have to interpret %hex escaping 1531 * *after* we find the slashes. It's possible to get 1532 * empty components here, (from multiple adjacent 1533 * slashes in the path) and RFC3986 says that we should 1534 * still do `CWD ' (with a null argument) in such cases. 1535 * 1536 * Many ftp servers don't support `CWD ', so if there's an 1537 * error performing that command, bail out with a descriptive 1538 * message. 1539 * 1540 * Examples: 1541 * 1542 * host: dir="", urltype=CLASSIC_URL_T 1543 * logged in (to default directory) 1544 * host:file dir=NULL, urltype=CLASSIC_URL_T 1545 * "RETR file" 1546 * host:dir/ dir="dir", urltype=CLASSIC_URL_T 1547 * "CWD dir", logged in 1548 * ftp://host/ dir="", urltype=FTP_URL_T 1549 * logged in (to default directory) 1550 * ftp://host/dir/ dir="dir", urltype=FTP_URL_T 1551 * "CWD dir", logged in 1552 * ftp://host/file dir=NULL, urltype=FTP_URL_T 1553 * "RETR file" 1554 * ftp://host//file dir="", urltype=FTP_URL_T 1555 * "CWD ", "RETR file" 1556 * host:/file dir="/", urltype=CLASSIC_URL_T 1557 * "CWD /", "RETR file" 1558 * ftp://host///file dir="/", urltype=FTP_URL_T 1559 * "CWD ", "CWD ", "RETR file" 1560 * ftp://host/%2F/file dir="%2F", urltype=FTP_URL_T 1561 * "CWD /", "RETR file" 1562 * ftp://host/foo/file dir="foo", urltype=FTP_URL_T 1563 * "CWD foo", "RETR file" 1564 * ftp://host/foo/bar/file dir="foo/bar" 1565 * "CWD foo", "CWD bar", "RETR file" 1566 * ftp://host//foo/bar/file dir="/foo/bar" 1567 * "CWD ", "CWD foo", "CWD bar", "RETR file" 1568 * ftp://host/foo//bar/file dir="foo//bar" 1569 * "CWD foo", "CWD ", "CWD bar", "RETR file" 1570 * ftp://host/%2F/foo/bar/file dir="%2F/foo/bar" 1571 * "CWD /", "CWD foo", "CWD bar", "RETR file" 1572 * ftp://host/%2Ffoo/bar/file dir="%2Ffoo/bar" 1573 * "CWD /foo", "CWD bar", "RETR file" 1574 * ftp://host/%2Ffoo%2Fbar/file dir="%2Ffoo%2Fbar" 1575 * "CWD /foo/bar", "RETR file" 1576 * ftp://host/%2Ffoo%2Fbar%2Ffile dir=NULL 1577 * "RETR /foo/bar/file" 1578 * 1579 * Note that we don't need `dir' after this point. 1580 */ 1581 do { 1582 if (urltype == FTP_URL_T) { 1583 nextpart = strchr(dir, '/'); 1584 if (nextpart) { 1585 *nextpart = '\0'; 1586 nextpart++; 1587 } 1588 url_decode(dir); 1589 } else 1590 nextpart = NULL; 1591 DPRINTF("fetch_ftp: dir `%s', nextpart `%s'\n", 1592 STRorNULL(dir), STRorNULL(nextpart)); 1593 if (urltype == FTP_URL_T || *dir != '\0') { 1594 xargv[0] = "cd"; 1595 xargv[1] = dir; 1596 xargv[2] = NULL; 1597 dirchange = 0; 1598 cd(2, xargv); 1599 if (! dirchange) { 1600 if (*dir == '\0' && code == 500) 1601 fprintf(stderr, 1602 "\n" 1603 "ftp: The `CWD ' command (without a directory), which is required by\n" 1604 " RFC3986 to support the empty directory in the URL pathname (`//'),\n" 1605 " conflicts with the server's conformance to RFC0959.\n" 1606 " Try the same URL without the `//' in the URL pathname.\n" 1607 "\n"); 1608 goto cleanup_fetch_ftp; 1609 } 1610 } 1611 dir = nextpart; 1612 } while (dir != NULL); 1613 } 1614 1615 if (EMPTYSTRING(file)) { 1616 rval = -1; 1617 goto cleanup_fetch_ftp; 1618 } 1619 1620 if (dirhasglob) { 1621 (void)strlcpy(rempath, dir, sizeof(rempath)); 1622 (void)strlcat(rempath, "/", sizeof(rempath)); 1623 (void)strlcat(rempath, file, sizeof(rempath)); 1624 file = rempath; 1625 } 1626 1627 /* Fetch the file(s). */ 1628 xargc = 2; 1629 xargv[0] = "get"; 1630 xargv[1] = file; 1631 xargv[2] = NULL; 1632 if (dirhasglob || filehasglob) { 1633 int ointeractive; 1634 1635 ointeractive = interactive; 1636 interactive = 0; 1637 if (restartautofetch) 1638 xargv[0] = "mreget"; 1639 else 1640 xargv[0] = "mget"; 1641 mget(xargc, xargv); 1642 interactive = ointeractive; 1643 } else { 1644 if (outfile == NULL) { 1645 cp = strrchr(file, '/'); /* find savefile */ 1646 if (cp != NULL) 1647 outfile = cp + 1; 1648 else 1649 outfile = file; 1650 } 1651 xargv[2] = (char *)outfile; 1652 xargv[3] = NULL; 1653 xargc++; 1654 if (restartautofetch) 1655 reget(xargc, xargv); 1656 else 1657 get(xargc, xargv); 1658 } 1659 1660 if ((code / 100) == COMPLETE) 1661 rval = 0; 1662 1663 cleanup_fetch_ftp: 1664 FREEPTR(port); 1665 FREEPTR(host); 1666 FREEPTR(path); 1667 FREEPTR(user); 1668 if (pass) 1669 memset(pass, 0, strlen(pass)); 1670 FREEPTR(pass); 1671 return (rval); 1672 } 1673 1674 /* 1675 * Retrieve the given file to outfile. 1676 * Supports arguments of the form: 1677 * "host:path", "ftp://host/path" if $ftpproxy, call fetch_url() else 1678 * call fetch_ftp() 1679 * "http://host/path" call fetch_url() to use HTTP 1680 * "file:///path" call fetch_url() to copy 1681 * "about:..." print a message 1682 * 1683 * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection 1684 * is still open (e.g, ftp xfer with trailing /) 1685 */ 1686 static int 1687 go_fetch(const char *url) 1688 { 1689 char *proxy; 1690 1691 #ifndef NO_ABOUT 1692 /* 1693 * Check for about:* 1694 */ 1695 if (STRNEQUAL(url, ABOUT_URL)) { 1696 url += sizeof(ABOUT_URL) -1; 1697 if (strcasecmp(url, "ftp") == 0 || 1698 strcasecmp(url, "tnftp") == 0) { 1699 fputs( 1700 "This version of ftp has been enhanced by Luke Mewburn <lukem@NetBSD.org>\n" 1701 "for the NetBSD project. Execute `man ftp' for more details.\n", ttyout); 1702 } else if (strcasecmp(url, "lukem") == 0) { 1703 fputs( 1704 "Luke Mewburn is the author of most of the enhancements in this ftp client.\n" 1705 "Please email feedback to <lukem@NetBSD.org>.\n", ttyout); 1706 } else if (strcasecmp(url, "netbsd") == 0) { 1707 fputs( 1708 "NetBSD is a freely available and redistributable UNIX-like operating system.\n" 1709 "For more information, see http://www.NetBSD.org/\n", ttyout); 1710 } else if (strcasecmp(url, "version") == 0) { 1711 fprintf(ttyout, "Version: %s %s%s\n", 1712 FTP_PRODUCT, FTP_VERSION, 1713 #ifdef INET6 1714 "" 1715 #else 1716 " (-IPv6)" 1717 #endif 1718 ); 1719 } else { 1720 fprintf(ttyout, "`%s' is an interesting topic.\n", url); 1721 } 1722 fputs("\n", ttyout); 1723 return (0); 1724 } 1725 #endif 1726 1727 /* 1728 * Check for file:// and http:// URLs. 1729 */ 1730 if (STRNEQUAL(url, HTTP_URL) || STRNEQUAL(url, FILE_URL)) 1731 return (fetch_url(url, NULL, NULL, NULL)); 1732 1733 /* 1734 * Try FTP URL-style and host:file arguments next. 1735 * If ftpproxy is set with an FTP URL, use fetch_url() 1736 * Othewise, use fetch_ftp(). 1737 */ 1738 proxy = getoptionvalue("ftp_proxy"); 1739 if (!EMPTYSTRING(proxy) && STRNEQUAL(url, FTP_URL)) 1740 return (fetch_url(url, NULL, NULL, NULL)); 1741 1742 return (fetch_ftp(url)); 1743 } 1744 1745 /* 1746 * Retrieve multiple files from the command line, 1747 * calling go_fetch() for each file. 1748 * 1749 * If an ftp path has a trailing "/", the path will be cd-ed into and 1750 * the connection remains open, and the function will return -1 1751 * (to indicate the connection is alive). 1752 * If an error occurs the return value will be the offset+1 in 1753 * argv[] of the file that caused a problem (i.e, argv[x] 1754 * returns x+1) 1755 * Otherwise, 0 is returned if all files retrieved successfully. 1756 */ 1757 int 1758 auto_fetch(int argc, char *argv[]) 1759 { 1760 volatile int argpos, rval; 1761 1762 argpos = rval = 0; 1763 1764 if (sigsetjmp(toplevel, 1)) { 1765 if (connected) 1766 disconnect(0, NULL); 1767 if (rval > 0) 1768 rval = argpos + 1; 1769 return (rval); 1770 } 1771 (void)xsignal(SIGINT, intr); 1772 (void)xsignal(SIGPIPE, lostpeer); 1773 1774 /* 1775 * Loop through as long as there's files to fetch. 1776 */ 1777 for (; (rval == 0) && (argpos < argc); argpos++) { 1778 if (strchr(argv[argpos], ':') == NULL) 1779 break; 1780 redirect_loop = 0; 1781 if (!anonftp) 1782 anonftp = 2; /* Handle "automatic" transfers. */ 1783 rval = go_fetch(argv[argpos]); 1784 if (outfile != NULL && strcmp(outfile, "-") != 0 1785 && outfile[0] != '|') 1786 outfile = NULL; 1787 if (rval > 0) 1788 rval = argpos + 1; 1789 } 1790 1791 if (connected && rval != -1) 1792 disconnect(0, NULL); 1793 return (rval); 1794 } 1795 1796 1797 /* 1798 * Upload multiple files from the command line. 1799 * 1800 * If an error occurs the return value will be the offset+1 in 1801 * argv[] of the file that caused a problem (i.e, argv[x] 1802 * returns x+1) 1803 * Otherwise, 0 is returned if all files uploaded successfully. 1804 */ 1805 int 1806 auto_put(int argc, char **argv, const char *uploadserver) 1807 { 1808 char *uargv[4], *path, *pathsep; 1809 int uargc, rval, argpos; 1810 size_t len; 1811 1812 uargc = 0; 1813 uargv[uargc++] = "mput"; 1814 uargv[uargc++] = argv[0]; 1815 uargv[2] = uargv[3] = NULL; 1816 pathsep = NULL; 1817 rval = 1; 1818 1819 DPRINTF("auto_put: target `%s'\n", uploadserver); 1820 1821 path = ftp_strdup(uploadserver); 1822 len = strlen(path); 1823 if (path[len - 1] != '/' && path[len - 1] != ':') { 1824 /* 1825 * make sure we always pass a directory to auto_fetch 1826 */ 1827 if (argc > 1) { /* more than one file to upload */ 1828 len = strlen(uploadserver) + 2; /* path + "/" + "\0" */ 1829 free(path); 1830 path = (char *)ftp_malloc(len); 1831 (void)strlcpy(path, uploadserver, len); 1832 (void)strlcat(path, "/", len); 1833 } else { /* single file to upload */ 1834 uargv[0] = "put"; 1835 pathsep = strrchr(path, '/'); 1836 if (pathsep == NULL) { 1837 pathsep = strrchr(path, ':'); 1838 if (pathsep == NULL) { 1839 warnx("Invalid URL `%s'", path); 1840 goto cleanup_auto_put; 1841 } 1842 pathsep++; 1843 uargv[2] = ftp_strdup(pathsep); 1844 pathsep[0] = '/'; 1845 } else 1846 uargv[2] = ftp_strdup(pathsep + 1); 1847 pathsep[1] = '\0'; 1848 uargc++; 1849 } 1850 } 1851 DPRINTF("auto_put: URL `%s' argv[2] `%s'\n", 1852 path, STRorNULL(uargv[2])); 1853 1854 /* connect and cwd */ 1855 rval = auto_fetch(1, &path); 1856 if(rval >= 0) 1857 goto cleanup_auto_put; 1858 1859 rval = 0; 1860 1861 /* target filename provided; upload 1 file */ 1862 /* XXX : is this the best way? */ 1863 if (uargc == 3) { 1864 uargv[1] = argv[0]; 1865 put(uargc, uargv); 1866 if ((code / 100) != COMPLETE) 1867 rval = 1; 1868 } else { /* otherwise a target dir: upload all files to it */ 1869 for(argpos = 0; argv[argpos] != NULL; argpos++) { 1870 uargv[1] = argv[argpos]; 1871 mput(uargc, uargv); 1872 if ((code / 100) != COMPLETE) { 1873 rval = argpos + 1; 1874 break; 1875 } 1876 } 1877 } 1878 1879 cleanup_auto_put: 1880 free(path); 1881 FREEPTR(uargv[2]); 1882 return (rval); 1883 } 1884