fetch.c revision 1.98
1 /* $NetBSD: fetch.c,v 1.98 1999/12/03 06:10:01 itojun Exp $ */ 2 3 /*- 4 * Copyright (c) 1997-1999 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 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __RCSID("$NetBSD: fetch.c,v 1.98 1999/12/03 06:10:01 itojun Exp $"); 42 #endif /* not lint */ 43 44 /* 45 * FTP User Program -- Command line file retrieval 46 */ 47 48 #include <sys/types.h> 49 #include <sys/param.h> 50 #include <sys/socket.h> 51 #include <sys/stat.h> 52 #include <sys/time.h> 53 54 #include <netinet/in.h> 55 56 #include <arpa/ftp.h> 57 #include <arpa/inet.h> 58 59 #include <ctype.h> 60 #include <err.h> 61 #include <errno.h> 62 #include <netdb.h> 63 #include <fcntl.h> 64 #include <stdio.h> 65 #include <stdlib.h> 66 #include <string.h> 67 #include <unistd.h> 68 #include <time.h> 69 #include <util.h> 70 71 #include "ftp_var.h" 72 73 typedef enum { 74 UNKNOWN_URL_T=-1, 75 HTTP_URL_T, 76 FTP_URL_T, 77 FILE_URL_T, 78 CLASSIC_URL_T 79 } url_t; 80 81 void aborthttp __P((int)); 82 static int auth_url __P((const char *, char **, const char *, 83 const char *)); 84 static void base64_encode __P((const char *, size_t, char *)); 85 static int go_fetch __P((const char *)); 86 static int fetch_ftp __P((const char *)); 87 static int fetch_url __P((const char *, const char *, char *, char *)); 88 static int parse_url __P((const char *, const char *, url_t *, char **, 89 char **, char **, char **, in_port_t *, 90 char **)); 91 static void url_decode __P((char *)); 92 93 static int redirect_loop; 94 95 96 #define ABOUT_URL "about:" /* propaganda */ 97 #define FILE_URL "file://" /* file URL prefix */ 98 #define FTP_URL "ftp://" /* ftp URL prefix */ 99 #define HTTP_URL "http://" /* http URL prefix */ 100 101 102 /* 103 * Generate authorization response based on given authentication challenge. 104 * Returns -1 if an error occurred, otherwise 0. 105 * Sets response to a malloc(3)ed string; caller should free. 106 */ 107 static int 108 auth_url(challenge, response, guser, gpass) 109 const char *challenge; 110 char **response; 111 const char *guser; 112 const char *gpass; 113 { 114 char *cp, *ep, *clear, *line, *realm, *scheme; 115 char user[BUFSIZ], *pass; 116 int rval; 117 size_t len, clen, rlen; 118 119 *response = NULL; 120 clear = realm = scheme = NULL; 121 rval = -1; 122 line = xstrdup(challenge); 123 cp = line; 124 125 if (debug) 126 fprintf(ttyout, "auth_url: challenge `%s'\n", challenge); 127 128 scheme = strsep(&cp, " "); 129 #define SCHEME_BASIC "Basic" 130 if (strncasecmp(scheme, SCHEME_BASIC, sizeof(SCHEME_BASIC) - 1) != 0) { 131 warnx("Unsupported WWW Authentication challenge - `%s'", 132 challenge); 133 goto cleanup_auth_url; 134 } 135 cp += strspn(cp, " "); 136 137 #define REALM "realm=\"" 138 if (strncasecmp(cp, REALM, sizeof(REALM) - 1) == 0) 139 cp += sizeof(REALM) - 1; 140 else { 141 warnx("Unsupported WWW Authentication challenge - `%s'", 142 challenge); 143 goto cleanup_auth_url; 144 } 145 if ((ep = strchr(cp, '\"')) != NULL) { 146 size_t len = ep - cp; 147 148 realm = (char *)xmalloc(len + 1); 149 (void)strlcpy(realm, cp, len + 1); 150 } else { 151 warnx("Unsupported WWW Authentication challenge - `%s'", 152 challenge); 153 goto cleanup_auth_url; 154 } 155 156 if (guser != NULL) 157 (void)strlcpy(user, guser, sizeof(user)); 158 else { 159 fprintf(ttyout, "Username for `%s': ", realm); 160 (void)fflush(ttyout); 161 if (fgets(user, sizeof(user) - 1, stdin) == NULL) { 162 clearerr(stdin); 163 goto cleanup_auth_url; 164 } 165 user[strlen(user) - 1] = '\0'; 166 } 167 if (gpass != NULL) 168 pass = (char *)gpass; 169 else 170 pass = getpass("Password: "); 171 172 clen = strlen(user) + strlen(pass) + 2; /* user + ":" + pass + "\0" */ 173 clear = (char *)xmalloc(clen); 174 (void)strlcpy(clear, user, clen); 175 (void)strlcat(clear, ":", clen); 176 (void)strlcat(clear, pass, clen); 177 if (gpass == NULL) 178 memset(pass, 0, strlen(pass)); 179 180 /* scheme + " " + enc + "\0" */ 181 rlen = strlen(scheme) + 1 + (clen + 2) * 4 / 3 + 1; 182 *response = (char *)xmalloc(rlen); 183 (void)strlcpy(*response, scheme, rlen); 184 len = strlcat(*response, " ", rlen); 185 base64_encode(clear, clen, *response + len); 186 memset(clear, 0, clen); 187 rval = 0; 188 189 cleanup_auth_url: 190 FREEPTR(clear); 191 FREEPTR(line); 192 FREEPTR(realm); 193 return (rval); 194 } 195 196 /* 197 * Encode len bytes starting at clear using base64 encoding into encoded, 198 * which should be at least ((len + 2) * 4 / 3 + 1) in size. 199 */ 200 void 201 base64_encode(clear, len, encoded) 202 const char *clear; 203 size_t len; 204 char *encoded; 205 { 206 static const char enc[] = 207 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 208 char *cp; 209 int i; 210 211 cp = encoded; 212 for (i = 0; i < len; i += 3) { 213 *(cp++) = enc[((clear[i + 0] >> 2))]; 214 *(cp++) = enc[((clear[i + 0] << 4) & 0x30) 215 | ((clear[i + 1] >> 4) & 0x0f)]; 216 *(cp++) = enc[((clear[i + 1] << 2) & 0x3c) 217 | ((clear[i + 2] >> 6) & 0x03)]; 218 *(cp++) = enc[((clear[i + 2] ) & 0x3f)]; 219 } 220 *cp = '\0'; 221 while (i-- > len) 222 *(--cp) = '='; 223 } 224 225 /* 226 * Decode %xx escapes in given string, `in-place'. 227 */ 228 static void 229 url_decode(url) 230 char *url; 231 { 232 unsigned char *p, *q; 233 234 if (EMPTYSTRING(url)) 235 return; 236 p = q = (unsigned char *)url; 237 238 #define HEXTOINT(x) (x - (isdigit(x) ? '0' : (islower(x) ? 'a' : 'A') - 10)) 239 while (*p) { 240 if (p[0] == '%' 241 && p[1] && isxdigit((unsigned char)p[1]) 242 && p[2] && isxdigit((unsigned char)p[2])) { 243 *q++ = HEXTOINT(p[1]) * 16 + HEXTOINT(p[2]); 244 p+=3; 245 } else 246 *q++ = *p++; 247 } 248 *q = '\0'; 249 } 250 251 252 /* 253 * Parse URL of form: 254 * <type>://[<user>[:<password>@]]<host>[:<port>][/<path>] 255 * Returns -1 if a parse error occurred, otherwise 0. 256 * It's the caller's responsibility to url_decode() the returned 257 * user, pass and path. 258 * 259 * Sets type to url_t, each of the given char ** pointers to a 260 * malloc(3)ed strings of the relevant section, and port to 261 * the number given, or ftpport if ftp://, or httpport if http://. 262 * 263 * If <host> is surrounded by `[' and ']', it's parsed as an 264 * IPv6 address (as per draft-ietf-ipngwg-url-literal-01.txt). 265 * 266 * XXX: this is not totally RFC 1738 compliant; <path> will have the 267 * leading `/' unless it's an ftp:// URL, as this makes things easier 268 * for file:// and http:// URLs. ftp:// URLs have the `/' between the 269 * host and the url-path removed, but any additional leading slashes 270 * in the url-path are retained (because they imply that we should 271 * later do "CWD" with a null argument). 272 * 273 * Examples: 274 * input url output path 275 * --------- ----------- 276 * "ftp://host" NULL 277 * "http://host/" NULL 278 * "file://host/dir/file" "dir/file" 279 * "ftp://host/" "" 280 * "ftp://host//" NULL 281 * "ftp://host//dir/file" "/dir/file" 282 */ 283 static int 284 parse_url(url, desc, type, user, pass, host, port, portnum, path) 285 const char *url; 286 const char *desc; 287 url_t *type; 288 char **user; 289 char **pass; 290 char **host; 291 char **port; 292 in_port_t *portnum; 293 char **path; 294 { 295 const char *origurl; 296 char *cp, *ep, *thost, *tport; 297 size_t len; 298 299 if (url == NULL || desc == NULL || type == NULL || user == NULL 300 || pass == NULL || host == NULL || port == NULL || portnum == NULL 301 || path == NULL) 302 errx(1, "parse_url: invoked with NULL argument!"); 303 304 origurl = url; 305 *type = UNKNOWN_URL_T; 306 *user = *pass = *host = *port = *path = NULL; 307 *portnum = 0; 308 tport = NULL; 309 310 if (strncasecmp(url, HTTP_URL, sizeof(HTTP_URL) - 1) == 0) { 311 url += sizeof(HTTP_URL) - 1; 312 *type = HTTP_URL_T; 313 *portnum = HTTP_PORT; 314 tport = httpport; 315 } else if (strncasecmp(url, FTP_URL, sizeof(FTP_URL) - 1) == 0) { 316 url += sizeof(FTP_URL) - 1; 317 *type = FTP_URL_T; 318 *portnum = FTP_PORT; 319 tport = ftpport; 320 } else if (strncasecmp(url, FILE_URL, sizeof(FILE_URL) - 1) == 0) { 321 url += sizeof(FILE_URL) - 1; 322 *type = FILE_URL_T; 323 } else { 324 warnx("Invalid %s `%s'", desc, url); 325 cleanup_parse_url: 326 FREEPTR(*user); 327 FREEPTR(*pass); 328 FREEPTR(*host); 329 FREEPTR(*port); 330 FREEPTR(*path); 331 return (-1); 332 } 333 334 if (*url == '\0') 335 return (0); 336 337 /* find [user[:pass]@]host[:port] */ 338 ep = strchr(url, '/'); 339 if (ep == NULL) 340 thost = xstrdup(url); 341 else { 342 len = ep - url; 343 thost = (char *)xmalloc(len + 1); 344 (void)strlcpy(thost, url, len + 1); 345 if (*type == FTP_URL_T) /* skip first / for ftp URLs */ 346 ep++; 347 *path = xstrdup(ep); 348 } 349 350 cp = strchr(thost, '@'); /* look for user[:pass]@ in URLs */ 351 if (cp != NULL) { 352 if (*type == FTP_URL_T) 353 anonftp = 0; /* disable anonftp */ 354 *user = thost; 355 *cp = '\0'; 356 thost = xstrdup(cp + 1); 357 cp = strchr(*user, ':'); 358 if (cp != NULL) { 359 *cp = '\0'; 360 *pass = xstrdup(cp + 1); 361 } 362 } 363 364 #ifdef INET6 365 /* 366 * Check if thost is an encoded IPv6 address, as per 367 * draft-ietf-ipngwg-url-literal-01.txt: 368 * `[' ipv6-address ']' 369 */ 370 if (*thost == '[') { 371 cp = thost + 1; 372 if ((ep = strchr(cp, ']')) == NULL || 373 (ep[1] != '\0' && ep[1] != '\0')) { 374 warnx("Invalid address `%s' in %s `%s'", 375 thost, desc, origurl); 376 goto cleanup_parse_url; 377 } 378 len = ep - cp; /* change `[xxx]' -> `xxx' */ 379 memmove(thost, thost + 1, len); 380 thost[len] = '\0'; 381 if (! isipv6addr(thost)) { 382 warnx("Invalid IPv6 address `%s' in %s `%s'", 383 thost, desc, origurl); 384 goto cleanup_parse_url; 385 } 386 cp = ep + 1; 387 if (*cp == ':') 388 cp++; 389 else 390 cp = NULL; 391 } else 392 #endif /* INET6 */ 393 if ((cp = strchr(thost, ':')) != NULL) 394 *cp++ = '\0'; 395 *host = thost; 396 397 /* look for [:port] */ 398 if (cp != NULL) { 399 long nport; 400 401 nport = strtol(cp, &ep, 10); 402 if (*ep != '\0' && ep == cp) { 403 struct servent *svp; 404 405 svp = getservbyname(cp, "tcp"); 406 if (svp == NULL) { 407 warnx("Unknown port `%s' in %s `%s'", 408 cp, desc, origurl); 409 goto cleanup_parse_url; 410 } else 411 nport = ntohs(svp->s_port); 412 } else if (nport < 1 || nport > MAX_IN_PORT_T || *ep != '\0') { 413 warnx("Invalid port `%s' in %s `%s'", cp, desc, 414 origurl); 415 goto cleanup_parse_url; 416 } 417 *portnum = nport; 418 tport = cp; 419 } 420 421 if (tport != NULL) 422 *port = xstrdup(tport); 423 if (*path == NULL) 424 *path = xstrdup(""); 425 426 if (debug) 427 fprintf(ttyout, 428 "parse_url: user `%s' pass `%s' host %s:%s(%d) path `%s'\n", 429 *user ? *user : "<null>", *pass ? *pass : "<null>", 430 *host ? *host : "<null>", *port ? *port : "<null>", 431 *portnum ? *portnum : -1, *path ? *path : "<null>"); 432 433 return (0); 434 } 435 436 sigjmp_buf httpabort; 437 438 /* 439 * Retrieve URL, via a proxy if necessary, using HTTP. 440 * If proxyenv is set, use that for the proxy, otherwise try ftp_proxy or 441 * http_proxy as appropriate. 442 * Supports HTTP redirects. 443 * Returns -1 on failure, 0 on completed xfer, 1 if ftp connection 444 * is still open (e.g, ftp xfer with trailing /) 445 */ 446 static int 447 fetch_url(url, proxyenv, proxyauth, wwwauth) 448 const char *url; 449 const char *proxyenv; 450 char *proxyauth; 451 char *wwwauth; 452 { 453 #ifdef NI_NUMERICHOST 454 struct addrinfo hints, *res, *res0 = NULL; 455 int error; 456 const char *reason; 457 char hbuf[NI_MAXHOST]; 458 #else 459 struct sockaddr_in sin; 460 struct hostent *hp = NULL; 461 #endif 462 volatile sig_t oldintr, oldintp; 463 volatile int s; 464 struct stat sb; 465 int ischunked, isproxy, rval, hcode; 466 size_t len; 467 static size_t bufsize; 468 static char *xferbuf; 469 char *cp, *ep, *buf, *savefile; 470 char *auth, *location, *message; 471 char *user, *pass, *host, *port, *path, *decodedpath; 472 char *puser, *ppass; 473 off_t hashbytes, rangestart, rangeend, entitylen; 474 int (*closefunc) __P((FILE *)); 475 FILE *fin, *fout; 476 time_t mtime; 477 url_t urltype; 478 in_port_t portnum; 479 480 oldintr = oldintp = NULL; 481 closefunc = NULL; 482 fin = fout = NULL; 483 s = -1; 484 buf = savefile = NULL; 485 auth = location = message = NULL; 486 ischunked = isproxy = hcode = 0; 487 rval = 1; 488 user = pass = host = path = decodedpath = puser = ppass = NULL; 489 490 #ifdef __GNUC__ /* shut up gcc warnings */ 491 (void)&closefunc; 492 (void)&fin; 493 (void)&fout; 494 (void)&buf; 495 (void)&savefile; 496 (void)&rval; 497 (void)&isproxy; 498 (void)&hcode; 499 (void)&ischunked; 500 (void)&message; 501 (void)&location; 502 (void)&auth; 503 (void)&decodedpath; 504 #endif 505 506 if (parse_url(url, "URL", &urltype, &user, &pass, &host, &port, 507 &portnum, &path) == -1) 508 goto cleanup_fetch_url; 509 510 if (urltype == FILE_URL_T && ! EMPTYSTRING(host) 511 && strcasecmp(host, "localhost") != 0) { 512 warnx("No support for non local file URL `%s'", url); 513 goto cleanup_fetch_url; 514 } 515 516 if (EMPTYSTRING(path)) { 517 if (urltype == FTP_URL_T) { 518 rval = fetch_ftp(url); 519 goto cleanup_fetch_url; 520 } 521 if (urltype != HTTP_URL_T || outfile == NULL) { 522 warnx("Invalid URL (no file after host) `%s'", url); 523 goto cleanup_fetch_url; 524 } 525 } 526 527 decodedpath = xstrdup(path); 528 url_decode(decodedpath); 529 530 if (outfile) 531 savefile = xstrdup(outfile); 532 else { 533 cp = strrchr(decodedpath, '/'); /* find savefile */ 534 if (cp != NULL) 535 savefile = xstrdup(cp + 1); 536 else 537 savefile = xstrdup(decodedpath); 538 } 539 if (EMPTYSTRING(savefile)) { 540 if (urltype == FTP_URL_T) { 541 rval = fetch_ftp(url); 542 goto cleanup_fetch_url; 543 } 544 warnx("Invalid URL (no file after directory) `%s'", url); 545 goto cleanup_fetch_url; 546 } else { 547 if (debug) 548 fprintf(ttyout, "got savefile as `%s'\n", savefile); 549 } 550 551 restart_point = 0; 552 filesize = -1; 553 rangestart = rangeend = entitylen = -1; 554 mtime = -1; 555 if (restartautofetch) { 556 if (strcmp(savefile, "-") != 0 && *savefile != '|' && 557 stat(savefile, &sb) == 0) 558 restart_point = sb.st_size; 559 } 560 if (urltype == FILE_URL_T) { /* file:// URLs */ 561 direction = "copied"; 562 fin = fopen(decodedpath, "r"); 563 if (fin == NULL) { 564 warn("Cannot open file `%s'", decodedpath); 565 goto cleanup_fetch_url; 566 } 567 if (fstat(fileno(fin), &sb) == 0) { 568 mtime = sb.st_mtime; 569 filesize = sb.st_size; 570 } 571 if (restart_point) { 572 if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 573 warn("Can't lseek to restart `%s'", 574 decodedpath); 575 goto cleanup_fetch_url; 576 } 577 } 578 if (verbose) { 579 fprintf(ttyout, "Copying %s", decodedpath); 580 if (restart_point) 581 #ifndef NO_QUAD 582 fprintf(ttyout, " (restarting at %lld)", 583 (long long)restart_point); 584 #else 585 fprintf(ttyout, " (restarting at %ld)", 586 (long)restart_point); 587 #endif 588 fputs("\n", ttyout); 589 } 590 } else { /* ftp:// or http:// URLs */ 591 char *leading; 592 int hasleading; 593 594 if (proxyenv == NULL) { 595 if (urltype == HTTP_URL_T) 596 proxyenv = getoptionvalue("http_proxy"); 597 else if (urltype == FTP_URL_T) 598 proxyenv = getoptionvalue("ftp_proxy"); 599 } 600 direction = "retrieved"; 601 if (! EMPTYSTRING(proxyenv)) { /* use proxy */ 602 url_t purltype; 603 char *phost, *ppath; 604 char *pport, *no_proxy; 605 606 isproxy = 1; 607 608 /* check URL against list of no_proxied sites */ 609 no_proxy = getoptionvalue("no_proxy"); 610 if (! EMPTYSTRING(no_proxy)) { 611 char *np, *np_copy; 612 long np_port; 613 size_t hlen, plen; 614 615 np_copy = xstrdup(no_proxy); 616 hlen = strlen(host); 617 while ((cp = strsep(&np_copy, " ,")) != NULL) { 618 if (*cp == '\0') 619 continue; 620 if ((np = strrchr(cp, ':')) != NULL) { 621 *np = '\0'; 622 np_port = 623 strtol(np + 1, &ep, 10); 624 if (*ep != '\0') 625 continue; 626 if (np_port != portnum) 627 continue; 628 } 629 plen = strlen(cp); 630 if (strncasecmp(host + hlen - plen, 631 cp, plen) == 0) { 632 isproxy = 0; 633 break; 634 } 635 } 636 FREEPTR(np_copy); 637 } 638 639 if (isproxy) { 640 if (parse_url(proxyenv, "proxy URL", &purltype, 641 &puser, &ppass, &phost, &pport, &portnum, 642 &ppath) == -1) 643 goto cleanup_fetch_url; 644 645 if ((purltype != HTTP_URL_T 646 && purltype != FTP_URL_T) || 647 EMPTYSTRING(phost) || 648 (! EMPTYSTRING(ppath) 649 && strcmp(ppath, "/") != 0)) { 650 warnx("Malformed proxy URL `%s'", 651 proxyenv); 652 FREEPTR(phost); 653 FREEPTR(pport); 654 FREEPTR(ppath); 655 goto cleanup_fetch_url; 656 } 657 658 FREEPTR(host); 659 host = phost; 660 FREEPTR(port); 661 port = pport; 662 FREEPTR(path); 663 path = xstrdup(url); 664 FREEPTR(ppath); 665 } 666 } /* ! EMPTYSTRING(proxyenv) */ 667 668 #ifndef NI_NUMERICHOST 669 memset(&sin, 0, sizeof(sin)); 670 sin.sin_family = AF_INET; 671 672 if (isdigit((unsigned char)host[0])) { 673 if (inet_aton(host, &sin.sin_addr) == 0) { 674 warnx("Invalid IP address `%s'", host); 675 goto cleanup_fetch_url; 676 } 677 } else { 678 hp = gethostbyname(host); 679 if (hp == NULL) { 680 warnx("%s: %s", host, hstrerror(h_errno)); 681 goto cleanup_fetch_url; 682 } 683 if (hp->h_addrtype != AF_INET) { 684 warnx("`%s': not an Internet address?", host); 685 goto cleanup_fetch_url; 686 } 687 if (hp->h_length > sizeof(sin.sin_addr)) 688 hp->h_length = sizeof(sin.sin_addr); 689 memcpy(&sin.sin_addr, hp->h_addr, hp->h_length); 690 } 691 sin.sin_port = htons(portnum); 692 693 s = socket(AF_INET, SOCK_STREAM, 0); 694 if (s == -1) { 695 warn("Can't create socket"); 696 goto cleanup_fetch_url; 697 } 698 699 while (xconnect(s, (struct sockaddr *)&sin, 700 sizeof(sin)) == -1) { 701 if (errno == EINTR) 702 continue; 703 if (hp && hp->h_addr_list[1]) { 704 int oerrno = errno; 705 char *ia; 706 707 ia = inet_ntoa(sin.sin_addr); 708 errno = oerrno; 709 warn("Connect to address `%s'", ia); 710 hp->h_addr_list++; 711 memcpy(&sin.sin_addr, hp->h_addr_list[0], 712 (size_t)hp->h_length); 713 if (verbose) 714 fprintf(ttyout, "Trying %s...\n", 715 inet_ntoa(sin.sin_addr)); 716 (void)close(s); 717 s = socket(AF_INET, SOCK_STREAM, 0); 718 if (s < 0) { 719 warn("Can't create socket"); 720 goto cleanup_fetch_url; 721 } 722 continue; 723 } 724 warn("Can't connect to `%s'", host); 725 goto cleanup_fetch_url; 726 } 727 #else 728 memset(&hints, 0, sizeof(hints)); 729 hints.ai_flags = 0; 730 hints.ai_family = AF_UNSPEC; 731 hints.ai_socktype = SOCK_STREAM; 732 hints.ai_protocol = 0; 733 error = getaddrinfo(host, port, &hints, &res0); 734 if (error) { 735 warnx(gai_strerror(error)); 736 goto cleanup_fetch_url; 737 } 738 if (res0->ai_canonname) 739 host = res0->ai_canonname; 740 741 reason = NULL; 742 s = -1; 743 for (res = res0; res; res = res->ai_next) { 744 if (getnameinfo(res->ai_addr, res->ai_addrlen, 745 hbuf, sizeof(hbuf), NULL, 0, 746 NI_NUMERICHOST) != 0) 747 strncpy(hbuf, "invalid", sizeof(hbuf)); 748 749 if (verbose && res != res0) 750 fprintf(ttyout, "Trying %s...\n", hbuf); 751 752 s = socket(res->ai_family, res->ai_socktype, 753 res->ai_protocol); 754 if (s < 0) { 755 reason = "socket"; 756 warn("Can't create socket"); 757 continue; 758 } 759 760 if (xconnect(s, res->ai_addr, res->ai_addrlen) < 0) { 761 reason = "connect"; 762 warn("Connect to address `%s'", hbuf); 763 close(s); 764 s = -1; 765 continue; 766 } 767 768 /* success */ 769 break; 770 } 771 freeaddrinfo(res0); 772 773 if (s < 0) { 774 warn("Can't connect to %s", host); 775 goto cleanup_fetch_url; 776 } 777 #endif 778 779 fin = fdopen(s, "r+"); 780 /* 781 * Construct and send the request. 782 */ 783 if (verbose) 784 fprintf(ttyout, "Requesting %s\n", url); 785 leading = " ("; 786 hasleading = 0; 787 if (isproxy) { 788 if (verbose) { 789 fprintf(ttyout, "%svia %s:%s", leading, 790 host, port); 791 leading = ", "; 792 hasleading++; 793 } 794 fprintf(fin, "GET %s HTTP/1.0\r\n", path); 795 if (flushcache) 796 fprintf(fin, "Pragma: no-cache\r\n"); 797 } else { 798 fprintf(fin, "GET %s HTTP/1.1\r\n", path); 799 fprintf(fin, "Host: %s:%d\r\n", host, portnum); 800 fprintf(fin, "Accept: */*\r\n"); 801 fprintf(fin, "Connection: close\r\n"); 802 if (restart_point) { 803 fputs(leading, ttyout); 804 #ifndef NO_QUAD 805 fprintf(fin, "Range: bytes=%lld-\r\n", 806 (long long)restart_point); 807 fprintf(ttyout, "restarting at %lld", 808 (long long)restart_point); 809 #else 810 fprintf(fin, "Range: bytes=%ld-\r\n", 811 (long)restart_point); 812 fprintf(ttyout, "restarting at %ld", 813 (long)restart_point); 814 #endif 815 leading = ", "; 816 hasleading++; 817 } 818 if (flushcache) 819 fprintf(fin, "Cache-Control: no-cache\r\n"); 820 } 821 fprintf(fin, "User-Agent: %s/%s\r\n", FTP_PRODUCT, FTP_VERSION); 822 if (wwwauth) { 823 if (verbose) { 824 fprintf(ttyout, "%swith authorization", 825 leading); 826 leading = ", "; 827 hasleading++; 828 } 829 fprintf(fin, "Authorization: %s\r\n", wwwauth); 830 } 831 if (proxyauth) { 832 if (verbose) { 833 fprintf(ttyout, 834 "%swith proxy authorization", leading); 835 leading = ", "; 836 hasleading++; 837 } 838 fprintf(fin, "Proxy-Authorization: %s\r\n", proxyauth); 839 } 840 if (verbose && hasleading) 841 fputs(")\n", ttyout); 842 fprintf(fin, "\r\n"); 843 if (fflush(fin) == EOF) { 844 warn("Writing HTTP request"); 845 goto cleanup_fetch_url; 846 } 847 848 /* Read the response */ 849 if ((buf = fparseln(fin, &len, NULL, "\0\0\0", 0)) == NULL) { 850 warn("Receiving HTTP reply"); 851 goto cleanup_fetch_url; 852 } 853 while (len > 0 && (buf[len-1] == '\r' || buf[len-1] == '\n')) 854 buf[--len] = '\0'; 855 if (debug) 856 fprintf(ttyout, "received `%s'\n", buf); 857 858 /* Determine HTTP response code */ 859 cp = strchr(buf, ' '); 860 if (cp == NULL) 861 goto improper; 862 else 863 cp++; 864 hcode = strtol(cp, &ep, 10); 865 if (*ep != '\0' && !isspace((unsigned char)*ep)) 866 goto improper; 867 message = xstrdup(cp); 868 869 /* Read the rest of the header. */ 870 FREEPTR(buf); 871 while (1) { 872 if ((buf = fparseln(fin, &len, NULL, "\0\0\0", 0)) 873 == NULL) { 874 warn("Receiving HTTP reply"); 875 goto cleanup_fetch_url; 876 } 877 while (len > 0 && 878 (buf[len-1] == '\r' || buf[len-1] == '\n')) 879 buf[--len] = '\0'; 880 if (len == 0) 881 break; 882 if (debug) 883 fprintf(ttyout, "received `%s'\n", buf); 884 885 /* Look for some headers */ 886 cp = buf; 887 888 #define CONTENTLEN "Content-Length: " 889 if (strncasecmp(cp, CONTENTLEN, 890 sizeof(CONTENTLEN) - 1) == 0) { 891 cp += sizeof(CONTENTLEN) - 1; 892 #ifndef NO_QUAD 893 filesize = strtoq(cp, &ep, 10); 894 #else 895 filesize = strtol(cp, &ep, 10); 896 #endif 897 if (filesize < 0 || *ep != '\0') 898 goto improper; 899 if (debug) 900 #ifndef NO_QUAD 901 fprintf(ttyout, "parsed len as: %lld\n", 902 (long long)filesize); 903 #else 904 fprintf(ttyout, "parsed len as: %ld\n", 905 (long)filesize); 906 #endif 907 908 #define CONTENTRANGE "Content-Range: bytes " 909 } else if (strncasecmp(cp, CONTENTRANGE, 910 sizeof(CONTENTRANGE) - 1) == 0) { 911 cp += sizeof(CONTENTRANGE) - 1; 912 #ifndef NO_QUAD 913 rangestart = strtoq(cp, &ep, 10); 914 #else 915 rangestart = strtol(cp, &ep, 10); 916 #endif 917 if (rangestart < 0 || *ep != '-') 918 goto improper; 919 cp = ep + 1; 920 921 #ifndef NO_QUAD 922 rangeend = strtoq(cp, &ep, 10); 923 #else 924 rangeend = strtol(cp, &ep, 10); 925 #endif 926 if (rangeend < 0 || *ep != '/' || 927 rangeend < rangestart) 928 goto improper; 929 cp = ep + 1; 930 931 #ifndef NO_QUAD 932 entitylen = strtoq(cp, &ep, 10); 933 #else 934 entitylen = strtol(cp, &ep, 10); 935 #endif 936 if (entitylen < 0 || *ep != '\0') 937 goto improper; 938 939 if (debug) 940 #ifndef NO_QUAD 941 fprintf(ttyout, 942 "parsed range as: %lld-%lld/%lld\n", 943 (long long)rangestart, 944 (long long)rangeend, 945 (long long)entitylen); 946 #else 947 fprintf(ttyout, 948 "parsed range as: %ld-%ld/%ld\n", 949 (long)rangestart, 950 (long)rangeend, 951 (long)entitylen); 952 #endif 953 if (! restart_point) { 954 warnx( 955 "Received unexpected Content-Range header"); 956 goto cleanup_fetch_url; 957 } 958 959 #define LASTMOD "Last-Modified: " 960 } else if (strncasecmp(cp, LASTMOD, 961 sizeof(LASTMOD) - 1) == 0) { 962 struct tm parsed; 963 char *t; 964 965 cp += sizeof(LASTMOD) - 1; 966 /* RFC 1123 */ 967 if ((t = strptime(cp, 968 "%a, %d %b %Y %H:%M:%S GMT", 969 &parsed)) 970 /* RFC 850 */ 971 || (t = strptime(cp, 972 "%a, %d-%b-%y %H:%M:%S GMT", 973 &parsed)) 974 /* asctime */ 975 || (t = strptime(cp, 976 "%a, %b %d %H:%M:%S %Y", 977 &parsed))) { 978 parsed.tm_isdst = -1; 979 if (*t == '\0') 980 mtime = timegm(&parsed); 981 if (debug && mtime != -1) { 982 fprintf(ttyout, 983 "parsed date as: %s", 984 ctime(&mtime)); 985 } 986 } 987 988 #define LOCATION "Location: " 989 } else if (strncasecmp(cp, LOCATION, 990 sizeof(LOCATION) - 1) == 0) { 991 cp += sizeof(LOCATION) - 1; 992 location = xstrdup(cp); 993 if (debug) 994 fprintf(ttyout, 995 "parsed location as: %s\n", cp); 996 997 #define TRANSENC "Transfer-Encoding: " 998 } else if (strncasecmp(cp, TRANSENC, 999 sizeof(TRANSENC) - 1) == 0) { 1000 cp += sizeof(TRANSENC) - 1; 1001 if (strcasecmp(cp, "chunked") != 0) { 1002 warnx( 1003 "Unsupported transfer encoding - `%s'", 1004 cp); 1005 goto cleanup_fetch_url; 1006 } 1007 ischunked++; 1008 if (debug) 1009 fprintf(ttyout, 1010 "using chunked encoding\n"); 1011 1012 #define PROXYAUTH "Proxy-Authenticate: " 1013 } else if (strncasecmp(cp, PROXYAUTH, 1014 sizeof(PROXYAUTH) - 1) == 0) { 1015 cp += sizeof(PROXYAUTH) - 1; 1016 FREEPTR(auth); 1017 auth = xstrdup(cp); 1018 if (debug) 1019 fprintf(ttyout, 1020 "parsed proxy-auth as: %s\n", cp); 1021 1022 #define WWWAUTH "WWW-Authenticate: " 1023 } else if (strncasecmp(cp, WWWAUTH, 1024 sizeof(WWWAUTH) - 1) == 0) { 1025 cp += sizeof(WWWAUTH) - 1; 1026 FREEPTR(auth); 1027 auth = xstrdup(cp); 1028 if (debug) 1029 fprintf(ttyout, 1030 "parsed www-auth as: %s\n", cp); 1031 1032 } 1033 1034 } 1035 /* finished parsing header */ 1036 FREEPTR(buf); 1037 1038 switch (hcode) { 1039 case 200: 1040 break; 1041 case 206: 1042 if (! restart_point) { 1043 warnx("Not expecting partial content header"); 1044 goto cleanup_fetch_url; 1045 } 1046 break; 1047 case 300: 1048 case 301: 1049 case 302: 1050 case 303: 1051 case 305: 1052 if (EMPTYSTRING(location)) { 1053 warnx( 1054 "No redirection Location provided by server"); 1055 goto cleanup_fetch_url; 1056 } 1057 if (redirect_loop++ > 5) { 1058 warnx("Too many redirections requested"); 1059 goto cleanup_fetch_url; 1060 } 1061 if (hcode == 305) { 1062 if (verbose) 1063 fprintf(ttyout, "Redirected via %s\n", 1064 location); 1065 rval = fetch_url(url, location, 1066 proxyauth, wwwauth); 1067 } else { 1068 if (verbose) 1069 fprintf(ttyout, "Redirected to %s\n", 1070 location); 1071 rval = go_fetch(location); 1072 } 1073 goto cleanup_fetch_url; 1074 case 401: 1075 case 407: 1076 { 1077 char **authp; 1078 char *auser, *apass; 1079 1080 fprintf(ttyout, "%s\n", message); 1081 if (EMPTYSTRING(auth)) { 1082 warnx( 1083 "No authentication challenge provided by server"); 1084 goto cleanup_fetch_url; 1085 } 1086 if (hcode == 401) { 1087 authp = &wwwauth; 1088 auser = user; 1089 apass = pass; 1090 } else { 1091 authp = &proxyauth; 1092 auser = puser; 1093 apass = ppass; 1094 } 1095 if (*authp != NULL) { 1096 char reply[10]; 1097 1098 fprintf(ttyout, 1099 "Authorization failed. Retry (y/n)? "); 1100 if (fgets(reply, sizeof(reply), stdin) 1101 == NULL) { 1102 clearerr(stdin); 1103 goto cleanup_fetch_url; 1104 } else { 1105 if (tolower(reply[0]) != 'y') 1106 goto cleanup_fetch_url; 1107 } 1108 auser = NULL; 1109 apass = NULL; 1110 } 1111 if (auth_url(auth, authp, auser, apass) == 0) { 1112 rval = fetch_url(url, proxyenv, 1113 proxyauth, wwwauth); 1114 memset(*authp, 0, strlen(*authp)); 1115 FREEPTR(*authp); 1116 } 1117 goto cleanup_fetch_url; 1118 } 1119 default: 1120 if (message) 1121 warnx("Error retrieving file - `%s'", message); 1122 else 1123 warnx("Unknown error retrieving file"); 1124 goto cleanup_fetch_url; 1125 } 1126 } /* end of ftp:// or http:// specific setup */ 1127 1128 /* Open the output file. */ 1129 if (strcmp(savefile, "-") == 0) { 1130 fout = stdout; 1131 } else if (*savefile == '|') { 1132 oldintp = xsignal(SIGPIPE, SIG_IGN); 1133 fout = popen(savefile + 1, "w"); 1134 if (fout == NULL) { 1135 warn("Can't run `%s'", savefile + 1); 1136 goto cleanup_fetch_url; 1137 } 1138 closefunc = pclose; 1139 } else { 1140 if (restart_point){ 1141 if (entitylen != -1) 1142 filesize = entitylen; 1143 if (rangestart != -1 && rangestart != restart_point) { 1144 warnx( 1145 "Size of `%s' differs from save file `%s'", 1146 url, savefile); 1147 goto cleanup_fetch_url; 1148 } 1149 fout = fopen(savefile, "a"); 1150 } else 1151 fout = fopen(savefile, "w"); 1152 if (fout == NULL) { 1153 warn("Can't open `%s'", savefile); 1154 goto cleanup_fetch_url; 1155 } 1156 closefunc = fclose; 1157 } 1158 1159 /* Trap signals */ 1160 if (sigsetjmp(httpabort, 1)) 1161 goto cleanup_fetch_url; 1162 (void)xsignal(SIGQUIT, psummary); 1163 oldintr = xsignal(SIGINT, aborthttp); 1164 1165 if (rcvbuf_size > bufsize) { 1166 if (xferbuf) 1167 (void)free(xferbuf); 1168 bufsize = rcvbuf_size; 1169 xferbuf = xmalloc(bufsize); 1170 } 1171 1172 bytes = 0; 1173 hashbytes = mark; 1174 progressmeter(-1); 1175 1176 /* Finally, suck down the file. */ 1177 do { 1178 long chunksize; 1179 1180 chunksize = 0; 1181 /* read chunksize */ 1182 if (ischunked) { 1183 if (fgets(xferbuf, bufsize, fin) == NULL) { 1184 warnx("Unexpected EOF reading chunksize"); 1185 goto cleanup_fetch_url; 1186 } 1187 chunksize = strtol(xferbuf, &ep, 16); 1188 if (strcmp(ep, "\r\n") != 0) { 1189 warnx("Unexpected data following chunksize"); 1190 goto cleanup_fetch_url; 1191 } 1192 if (debug) 1193 fprintf(ttyout, 1194 #ifndef NO_QUAD 1195 "got chunksize of %lld\n", 1196 (long long)chunksize); 1197 #else 1198 "got chunksize of %ld\n", 1199 (long)chunksize); 1200 #endif 1201 if (chunksize == 0) 1202 break; 1203 } 1204 /* transfer file or chunk */ 1205 while (1) { 1206 struct timeval then, now, td; 1207 off_t bufrem; 1208 1209 if (rate_get) 1210 (void)gettimeofday(&then, NULL); 1211 bufrem = rate_get ? rate_get : bufsize; 1212 while (bufrem > 0) { 1213 len = fread(xferbuf, sizeof(char), 1214 ischunked ? MIN(chunksize, bufrem) 1215 : bufsize, fin); 1216 if (len <= 0) 1217 goto chunkdone; 1218 bytes += len; 1219 bufrem -= len; 1220 if (fwrite(xferbuf, sizeof(char), len, fout) 1221 != len) { 1222 warn("Writing `%s'", savefile); 1223 goto cleanup_fetch_url; 1224 } 1225 } 1226 if (hash && !progress) { 1227 while (bytes >= hashbytes) { 1228 (void)putc('#', ttyout); 1229 hashbytes += mark; 1230 } 1231 (void)fflush(ttyout); 1232 } 1233 if (ischunked) { 1234 chunksize -= len; 1235 if (chunksize <= 0) 1236 goto chunkdone; 1237 } 1238 if (rate_get) { 1239 while (1) { 1240 (void)gettimeofday(&now, NULL); 1241 timersub(&now, &then, &td); 1242 if (td.tv_sec > 0) 1243 break; 1244 usleep(1000000 - td.tv_usec); 1245 } 1246 } 1247 } 1248 /* read CRLF after chunk*/ 1249 chunkdone: 1250 if (ischunked) { 1251 if (fgets(xferbuf, bufsize, fin) == NULL) 1252 break; 1253 if (strcmp(xferbuf, "\r\n") != 0) { 1254 warnx("Unexpected data following chunk"); 1255 goto cleanup_fetch_url; 1256 } 1257 } 1258 } while (ischunked); 1259 if (hash && !progress && bytes > 0) { 1260 if (bytes < mark) 1261 (void)putc('#', ttyout); 1262 (void)putc('\n', ttyout); 1263 } 1264 if (ferror(fin)) { 1265 warn("Reading file"); 1266 goto cleanup_fetch_url; 1267 } 1268 progressmeter(1); 1269 bytes = 0; 1270 (void)fflush(fout); 1271 if (closefunc == fclose && mtime != -1) { 1272 struct timeval tval[2]; 1273 1274 (void)gettimeofday(&tval[0], NULL); 1275 tval[1].tv_sec = mtime; 1276 tval[1].tv_usec = 0; 1277 (*closefunc)(fout); 1278 fout = NULL; 1279 1280 if (utimes(savefile, tval) == -1) { 1281 fprintf(ttyout, 1282 "Can't change modification time to %s", 1283 asctime(localtime(&mtime))); 1284 } 1285 } 1286 if (bytes > 0) 1287 ptransfer(0); 1288 1289 rval = 0; 1290 goto cleanup_fetch_url; 1291 1292 improper: 1293 warnx("Improper response from `%s'", host); 1294 1295 cleanup_fetch_url: 1296 if (oldintr) 1297 (void)xsignal(SIGINT, oldintr); 1298 if (oldintp) 1299 (void)xsignal(SIGPIPE, oldintp); 1300 if (fin != NULL) 1301 fclose(fin); 1302 else if (s != -1) 1303 close(s); 1304 if (closefunc != NULL && fout != NULL) 1305 (*closefunc)(fout); 1306 #ifdef NI_NUMERICHOST 1307 if (res != NULL) 1308 freeaddrinfo(res); 1309 #endif 1310 FREEPTR(savefile); 1311 FREEPTR(user); 1312 FREEPTR(pass); 1313 FREEPTR(host); 1314 FREEPTR(port); 1315 FREEPTR(path); 1316 FREEPTR(decodedpath); 1317 FREEPTR(puser); 1318 FREEPTR(ppass); 1319 FREEPTR(buf); 1320 FREEPTR(auth); 1321 FREEPTR(location); 1322 FREEPTR(message); 1323 return (rval); 1324 } 1325 1326 /* 1327 * Abort a HTTP retrieval 1328 */ 1329 void 1330 aborthttp(notused) 1331 int notused; 1332 { 1333 char msgbuf[100]; 1334 int len; 1335 1336 alarmtimer(0); 1337 len = strlcpy(msgbuf, "\nHTTP fetch aborted.\n", sizeof(msgbuf)); 1338 write(fileno(ttyout), msgbuf, len); 1339 siglongjmp(httpabort, 1); 1340 } 1341 1342 /* 1343 * Retrieve ftp URL or classic ftp argument using FTP. 1344 * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection 1345 * is still open (e.g, ftp xfer with trailing /) 1346 */ 1347 static int 1348 fetch_ftp(url) 1349 const char *url; 1350 { 1351 char *cp, *xargv[5], rempath[MAXPATHLEN]; 1352 char *host, *path, *dir, *file, *user, *pass; 1353 char *port; 1354 int dirhasglob, filehasglob, oautologin, rval, type, xargc; 1355 in_port_t portnum; 1356 url_t urltype; 1357 1358 host = path = dir = file = user = pass = NULL; 1359 port = NULL; 1360 rval = 1; 1361 type = TYPE_I; 1362 1363 if (strncasecmp(url, FTP_URL, sizeof(FTP_URL) - 1) == 0) { 1364 if ((parse_url(url, "URL", &urltype, &user, &pass, 1365 &host, &port, &portnum, &path) == -1) || 1366 (user != NULL && *user == '\0') || 1367 (pass != NULL && *pass == '\0') || 1368 EMPTYSTRING(host)) { 1369 warnx("Invalid URL `%s'", url); 1370 goto cleanup_fetch_ftp; 1371 } 1372 url_decode(user); 1373 url_decode(pass); 1374 /* 1375 * Note: Don't url_decode(path) here. We need to keep the 1376 * distinction between "/" and "%2F" until later. 1377 */ 1378 1379 /* check for trailing ';type=[aid]' */ 1380 if (! EMPTYSTRING(path) && (cp = strrchr(path, ';')) != NULL) { 1381 if (strcasecmp(cp, ";type=a") == 0) 1382 type = TYPE_A; 1383 else if (strcasecmp(cp, ";type=i") == 0) 1384 type = TYPE_I; 1385 else if (strcasecmp(cp, ";type=d") == 0) { 1386 warnx( 1387 "Directory listing via a URL is not supported"); 1388 goto cleanup_fetch_ftp; 1389 } else { 1390 warnx("Invalid suffix `%s' in URL `%s'", cp, 1391 url); 1392 goto cleanup_fetch_ftp; 1393 } 1394 *cp = 0; 1395 } 1396 } else { /* classic style `[user@]host:[file]' */ 1397 urltype = CLASSIC_URL_T; 1398 host = xstrdup(url); 1399 cp = strchr(host, '@'); 1400 if (cp != NULL) { 1401 *cp = '\0'; 1402 user = host; 1403 anonftp = 0; /* disable anonftp */ 1404 host = xstrdup(cp + 1); 1405 } 1406 cp = strchr(host, ':'); 1407 if (cp != NULL) { 1408 *cp = '\0'; 1409 path = xstrdup(cp + 1); 1410 } 1411 } 1412 if (EMPTYSTRING(host)) 1413 goto cleanup_fetch_ftp; 1414 1415 /* Extract the file and (if present) directory name. */ 1416 dir = path; 1417 if (! EMPTYSTRING(dir)) { 1418 /* 1419 * If we are dealing with classic `[user@]host:[path]' syntax, 1420 * then a path of the form `/file' (resulting from input of the 1421 * form `host:/file') means that we should do "CWD /" before 1422 * retrieving the file. So we set dir="/" and file="file". 1423 * 1424 * But if we are dealing with URLs like `ftp://host/path' then 1425 * a path of the form `/file' (resulting from a URL of the form 1426 * `ftp://host//file') means that we should do `CWD ' (with an 1427 * empty argument) before retrieving the file. So we set 1428 * dir="" and file="file". 1429 * 1430 * If the path does not contain / at all, we set dir=NULL. 1431 * (We get a path without any slashes if we are dealing with 1432 * classic `[user@]host:[file]' or URL `ftp://host/file'.) 1433 * 1434 * In all other cases, we set dir to a string that does not 1435 * include the final '/' that separates the dir part from the 1436 * file part of the path. (This will be the empty string if 1437 * and only if we are dealing with a path of the form `/file' 1438 * resulting from an URL of the form `ftp://host//file'.) 1439 */ 1440 cp = strrchr(dir, '/'); 1441 if (cp == dir && urltype == CLASSIC_URL_T) { 1442 file = cp + 1; 1443 dir = "/"; 1444 } else if (cp != NULL) { 1445 *cp++ = '\0'; 1446 file = cp; 1447 } else { 1448 file = dir; 1449 dir = NULL; 1450 } 1451 } else 1452 dir = NULL; 1453 if (urltype == FTP_URL_T && file != NULL) { 1454 url_decode(file); 1455 /* but still don't url_decode(dir) */ 1456 } 1457 if (debug) 1458 fprintf(ttyout, 1459 "fetch_ftp: user `%s' pass `%s' host %s:%s path `%s' dir `%s' file `%s'\n", 1460 user ? user : "<null>", pass ? pass : "<null>", 1461 host ? host : "<null>", port ? port : "<null>", 1462 path ? path : "<null>", 1463 dir ? dir : "<null>", file ? file : "<null>"); 1464 1465 dirhasglob = filehasglob = 0; 1466 if (doglob && urltype == CLASSIC_URL_T) { 1467 if (! EMPTYSTRING(dir) && strpbrk(dir, "*?[]{}") != NULL) 1468 dirhasglob = 1; 1469 if (! EMPTYSTRING(file) && strpbrk(file, "*?[]{}") != NULL) 1470 filehasglob = 1; 1471 } 1472 1473 /* Set up the connection */ 1474 if (connected) 1475 disconnect(0, NULL); 1476 xargv[0] = __progname; 1477 xargv[1] = host; 1478 xargv[2] = NULL; 1479 xargc = 2; 1480 if (port) { 1481 xargv[2] = port; 1482 xargv[3] = NULL; 1483 xargc = 3; 1484 } 1485 oautologin = autologin; 1486 if (user != NULL) 1487 autologin = 0; 1488 setpeer(xargc, xargv); 1489 autologin = oautologin; 1490 if ((connected == 0) || ((connected == 1) 1491 && !ftp_login(host, user, pass))) { 1492 warnx("Can't connect or login to host `%s'", host); 1493 goto cleanup_fetch_ftp; 1494 } 1495 1496 switch (type) { 1497 case TYPE_A: 1498 setascii(0, NULL); 1499 break; 1500 case TYPE_I: 1501 setbinary(0, NULL); 1502 break; 1503 default: 1504 errx(1, "fetch_ftp: unknown transfer type %d", type); 1505 } 1506 1507 /* 1508 * Change directories, if necessary. 1509 * 1510 * Note: don't use EMPTYSTRING(dir) below, because 1511 * dir=="" means something different from dir==NULL. 1512 */ 1513 if (dir != NULL && !dirhasglob) { 1514 char *nextpart; 1515 1516 /* 1517 * If we are dealing with a classic `[user@]host:[path]' 1518 * (urltype is CLASSIC_URL_T) then we have a raw directory 1519 * name (not encoded in any way) and we can change 1520 * directories in one step. 1521 * 1522 * If we are dealing with an `ftp://host/path' URL 1523 * (urltype is FTP_URL_T), then RFC 1738 says we need to 1524 * send a separate CWD command for each unescaped "/" 1525 * in the path, and we have to interpret %hex escaping 1526 * *after* we find the slashes. It's possible to get 1527 * empty components here, (from multiple adjacent 1528 * slashes in the path) and RFC 1738 says that we should 1529 * still do `CWD ' (with a null argument) in such cases. 1530 * 1531 * Many ftp servers don't support `CWD ', so if there's an 1532 * error performing that command, bail out with a descriptive 1533 * message. 1534 * 1535 * Examples: 1536 * 1537 * host: dir="", urltype=CLASSIC_URL_T 1538 * logged in (to default directory) 1539 * host:file dir=NULL, urltype=CLASSIC_URL_T 1540 * "RETR file" 1541 * host:dir/ dir="dir", urltype=CLASSIC_URL_T 1542 * "CWD dir", logged in 1543 * ftp://host/ dir="", urltype=FTP_URL_T 1544 * logged in (to default directory) 1545 * ftp://host/dir/ dir="dir", urltype=FTP_URL_T 1546 * "CWD dir", logged in 1547 * ftp://host/file dir=NULL, urltype=FTP_URL_T 1548 * "RETR file" 1549 * ftp://host//file dir="", urltype=FTP_URL_T 1550 * "CWD ", "RETR file" 1551 * host:/file dir="/", urltype=CLASSIC_URL_T 1552 * "CWD /", "RETR file" 1553 * ftp://host///file dir="/", urltype=FTP_URL_T 1554 * "CWD ", "CWD ", "RETR file" 1555 * ftp://host/%2F/file dir="%2F", urltype=FTP_URL_T 1556 * "CWD /", "RETR file" 1557 * ftp://host/foo/file dir="foo", urltype=FTP_URL_T 1558 * "CWD foo", "RETR file" 1559 * ftp://host/foo/bar/file dir="foo/bar" 1560 * "CWD foo", "CWD bar", "RETR file" 1561 * ftp://host//foo/bar/file dir="/foo/bar" 1562 * "CWD ", "CWD foo", "CWD bar", "RETR file" 1563 * ftp://host/foo//bar/file dir="foo//bar" 1564 * "CWD foo", "CWD ", "CWD bar", "RETR file" 1565 * ftp://host/%2F/foo/bar/file dir="%2F/foo/bar" 1566 * "CWD /", "CWD foo", "CWD bar", "RETR file" 1567 * ftp://host/%2Ffoo/bar/file dir="%2Ffoo/bar" 1568 * "CWD /foo", "CWD bar", "RETR file" 1569 * ftp://host/%2Ffoo%2Fbar/file dir="%2Ffoo%2Fbar" 1570 * "CWD /foo/bar", "RETR file" 1571 * ftp://host/%2Ffoo%2Fbar%2Ffile dir=NULL 1572 * "RETR /foo/bar/file" 1573 * 1574 * Note that we don't need `dir' after this point. 1575 */ 1576 do { 1577 if (urltype == FTP_URL_T) { 1578 nextpart = strchr(dir, '/'); 1579 if (nextpart) { 1580 *nextpart = '\0'; 1581 nextpart++; 1582 } 1583 url_decode(dir); 1584 } else 1585 nextpart = NULL; 1586 if (debug) 1587 fprintf(ttyout, "dir `%s', nextpart `%s'\n", 1588 dir ? dir : "<null>", 1589 nextpart ? nextpart : "<null>"); 1590 if (urltype == FTP_URL_T || *dir != '\0') { 1591 xargv[0] = "cd"; 1592 xargv[1] = dir; 1593 xargv[2] = NULL; 1594 dirchange = 0; 1595 cd(2, xargv); 1596 if (! dirchange) { 1597 if (*dir == '\0' && code == 500) 1598 fprintf(stderr, 1599 "\n" 1600 "ftp: The `CWD ' command (without a directory), which is required by\n" 1601 " RFC 1738 to support the empty directory in the URL pathname (`//'),\n" 1602 " conflicts with the server's conformance to RFC 959.\n" 1603 " Try the same URL without the `//' in the URL pathname.\n" 1604 "\n"); 1605 goto cleanup_fetch_ftp; 1606 } 1607 } 1608 dir = nextpart; 1609 } while (dir != NULL); 1610 } 1611 1612 if (EMPTYSTRING(file)) { 1613 rval = -1; 1614 goto cleanup_fetch_ftp; 1615 } 1616 1617 if (dirhasglob) { 1618 (void)strlcpy(rempath, dir, sizeof(rempath)); 1619 (void)strlcat(rempath, "/", sizeof(rempath)); 1620 (void)strlcat(rempath, file, sizeof(rempath)); 1621 file = rempath; 1622 } 1623 1624 /* Fetch the file(s). */ 1625 xargc = 2; 1626 xargv[0] = "get"; 1627 xargv[1] = file; 1628 xargv[2] = NULL; 1629 if (dirhasglob || filehasglob) { 1630 int ointeractive; 1631 1632 ointeractive = interactive; 1633 interactive = 0; 1634 xargv[0] = "mget"; 1635 mget(xargc, xargv); 1636 interactive = ointeractive; 1637 } else { 1638 if (outfile == NULL) { 1639 cp = strrchr(file, '/'); /* find savefile */ 1640 if (cp != NULL) 1641 outfile = cp + 1; 1642 else 1643 outfile = file; 1644 } 1645 xargv[2] = (char *)outfile; 1646 xargv[3] = NULL; 1647 xargc++; 1648 if (restartautofetch) 1649 reget(xargc, xargv); 1650 else 1651 get(xargc, xargv); 1652 } 1653 1654 if ((code / 100) == COMPLETE) 1655 rval = 0; 1656 1657 cleanup_fetch_ftp: 1658 FREEPTR(host); 1659 FREEPTR(path); 1660 FREEPTR(user); 1661 FREEPTR(pass); 1662 return (rval); 1663 } 1664 1665 /* 1666 * Retrieve the given file to outfile. 1667 * Supports arguments of the form: 1668 * "host:path", "ftp://host/path" if $ftpproxy, call fetch_url() else 1669 * call fetch_ftp() 1670 * "http://host/path" call fetch_url() to use HTTP 1671 * "file:///path" call fetch_url() to copy 1672 * "about:..." print a message 1673 * 1674 * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection 1675 * is still open (e.g, ftp xfer with trailing /) 1676 */ 1677 static int 1678 go_fetch(url) 1679 const char *url; 1680 { 1681 char *proxy; 1682 1683 /* 1684 * Check for about:* 1685 */ 1686 if (strncasecmp(url, ABOUT_URL, sizeof(ABOUT_URL) - 1) == 0) { 1687 url += sizeof(ABOUT_URL) -1; 1688 if (strcasecmp(url, "ftp") == 0) { 1689 fputs( 1690 "This version of ftp has been enhanced by Luke Mewburn <lukem (at) netbsd.org>\n" 1691 "for the NetBSD project. Execute `man ftp' for more details.\n", ttyout); 1692 } else if (strcasecmp(url, "lukem") == 0) { 1693 fputs( 1694 "Luke Mewburn is the author of most of the enhancements in this ftp client.\n" 1695 "Please email feedback to <lukem (at) netbsd.org>.\n", ttyout); 1696 } else if (strcasecmp(url, "netbsd") == 0) { 1697 fputs( 1698 "NetBSD is a freely available and redistributable UNIX-like operating system.\n" 1699 "For more information, see http://www.netbsd.org/index.html\n", ttyout); 1700 } else if (strcasecmp(url, "version") == 0) { 1701 fprintf(ttyout, "Version: %s %s\n", 1702 FTP_PRODUCT, FTP_VERSION); 1703 } else { 1704 fprintf(ttyout, "`%s' is an interesting topic.\n", url); 1705 } 1706 fputs("\n", ttyout); 1707 return (0); 1708 } 1709 1710 /* 1711 * Check for file:// and http:// URLs. 1712 */ 1713 if (strncasecmp(url, HTTP_URL, sizeof(HTTP_URL) - 1) == 0 || 1714 strncasecmp(url, FILE_URL, sizeof(FILE_URL) - 1) == 0) 1715 return (fetch_url(url, NULL, NULL, NULL)); 1716 1717 /* 1718 * Try FTP URL-style and host:file arguments next. 1719 * If ftpproxy is set with an FTP URL, use fetch_url() 1720 * Othewise, use fetch_ftp(). 1721 */ 1722 proxy = getoptionvalue("ftp_proxy"); 1723 if (!EMPTYSTRING(proxy) && 1724 strncasecmp(url, FTP_URL, sizeof(FTP_URL) - 1) == 0) 1725 return (fetch_url(url, NULL, NULL, NULL)); 1726 1727 return (fetch_ftp(url)); 1728 } 1729 1730 /* 1731 * Retrieve multiple files from the command line, 1732 * calling go_fetch() for each file. 1733 * 1734 * If an ftp path has a trailing "/", the path will be cd-ed into and 1735 * the connection remains open, and the function will return -1 1736 * (to indicate the connection is alive). 1737 * If an error occurs the return value will be the offset+1 in 1738 * argv[] of the file that caused a problem (i.e, argv[x] 1739 * returns x+1) 1740 * Otherwise, 0 is returned if all files retrieved successfully. 1741 */ 1742 int 1743 auto_fetch(argc, argv) 1744 int argc; 1745 char *argv[]; 1746 { 1747 volatile int argpos; 1748 int rval; 1749 1750 argpos = 0; 1751 1752 if (sigsetjmp(toplevel, 1)) { 1753 if (connected) 1754 disconnect(0, NULL); 1755 return (argpos + 1); 1756 } 1757 (void)xsignal(SIGINT, intr); 1758 (void)xsignal(SIGPIPE, lostpeer); 1759 1760 /* 1761 * Loop through as long as there's files to fetch. 1762 */ 1763 for (rval = 0; (rval == 0) && (argpos < argc); argpos++) { 1764 if (strchr(argv[argpos], ':') == NULL) 1765 break; 1766 redirect_loop = 0; 1767 if (!anonftp) 1768 anonftp = 2; /* Handle "automatic" transfers. */ 1769 rval = go_fetch(argv[argpos]); 1770 if (outfile != NULL && strcmp(outfile, "-") != 0 1771 && outfile[0] != '|') 1772 outfile = NULL; 1773 if (rval > 0) 1774 rval = argpos + 1; 1775 } 1776 1777 if (connected && rval != -1) 1778 disconnect(0, NULL); 1779 return (rval); 1780 } 1781
Indexes created Tue Sep 23 14:10:03 GMT 2025