src/bin/network/ftp/fetch.c

   1 /*      $NetBSD: fetch.c,v 1.158 2005/05/14 15:26:43 lukem Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1997-2004 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
  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 <libutil.h>
  70
  71 #include "ftp_var.h"
  72 #include "version.h"
  73
  74 typedef enum {
  75         UNKNOWN_URL_T=-1,
  76         HTTP_URL_T,
  77         FTP_URL_T,
  78         FILE_URL_T,
  79         CLASSIC_URL_T
  80 } url_t;
  81
  82 void            aborthttp(int);
  83 #ifndef NO_AUTH
  84 static int      auth_url(const char *, char **, const char *, const char *);
  85 static void     base64_encode(const unsigned char *, size_t, unsigned char *);
  86 #endif
  87 static int      go_fetch(const char *);
  88 static int      fetch_ftp(const char *);
  89 static int      fetch_url(const char *, const char *, char *, char *);
  90 static const char *match_token(const char **, const char *);
  91 static int      parse_url(const char *, const char *, url_t *, char **,
  92                             char **, char **, char **, in_port_t *, char **);
  93 static void     url_decode(char *);
  94
  95 static int      redirect_loop;
  96
  97
  98 #define STRNEQUAL(a,b)  (strncasecmp((a), (b), sizeof((b))-1) == 0)
  99 #define ISLWS(x)        ((x)=='\r' || (x)=='\n' || (x)==' ' || (x)=='\t')
 100 #define SKIPLWS(x)      do { while (ISLWS((*x))) x++; } while (0)
 101
 102
 103 #define ABOUT_URL       "about:"        /* propaganda */
 104 #define FILE_URL        "file://"       /* file URL prefix */
 105 #define FTP_URL         "ftp://"        /* ftp URL prefix */
 106 #define HTTP_URL        "http://"       /* http URL prefix */
 107
 108
 109 /*
 110  * Determine if token is the next word in buf (case insensitive).
 111  * If so, advance buf past the token and any trailing LWS, and
 112  * return a pointer to the token (in buf).  Otherwise, return NULL.
 113  * token may be preceeded by LWS.
 114  * token must be followed by LWS or NUL.  (I.e, don't partial match).
 115  */
 116 static const char *
 117 match_token(const char **buf, const char *token)
 118 {
 119         const char      *p, *orig;
 120         size_t          tlen;
 121
 122         tlen = strlen(token);
 123         p = *buf;
 124         SKIPLWS(p);
 125         orig = p;
 126         if (strncasecmp(p, token, tlen) != 0)
 127                 return NULL;
 128         p += tlen;
 129         if (*p != '\0' && !ISLWS(*p))
 130                 return NULL;
 131         SKIPLWS(p);
 132         orig = *buf;
 133         *buf = p;
 134         return orig;
 135 }
 136
 137 #ifndef NO_AUTH
 138 /*
 139  * Generate authorization response based on given authentication challenge.
 140  * Returns -1 if an error occurred, otherwise 0.
 141  * Sets response to a malloc(3)ed string; caller should free.
 142  */
 143 static int
 144 auth_url(const char *challenge, char **response, const char *guser,
 145         const char *gpass)
 146 {
 147         const char      *cp, *scheme;
 148         char            *ep, *clear, *realm;
 149         char             user[BUFSIZ], *pass;
 150         int              rval;
 151         size_t           len, clen, rlen;
 152
 153         *response = NULL;
 154         clear = realm = NULL;
 155         rval = -1;
 156         cp = challenge;
 157         scheme = "Basic";       /* only support Basic authentication */
 158
 159         if (debug)
 160                 fprintf(ttyout, "auth_url: challenge `%s'\n", challenge);
 161
 162         if (! match_token(&cp, scheme)) {
 163                 warnx("Unsupported authentication challenge - `%s'",
 164                     challenge);
 165                 goto cleanup_auth_url;
 166         }
 167
 168 #define REALM "realm=\""
 169         if (STRNEQUAL(cp, REALM))
 170                 cp += sizeof(REALM) - 1;
 171         else {
 172                 warnx("Unsupported authentication challenge - `%s'",
 173                     challenge);
 174                 goto cleanup_auth_url;
 175         }
 176 /* XXX: need to improve quoted-string parsing to support \ quoting, etc. */
 177         if ((ep = strchr(cp, '\"')) != NULL) {
 178                 size_t len = ep - cp;
 179
 180                 realm = (char *)xmalloc(len + 1);
 181                 (void)strlcpy(realm, cp, len + 1);
 182         } else {
 183                 warnx("Unsupported authentication challenge - `%s'",
 184                     challenge);
 185                 goto cleanup_auth_url;
 186         }
 187
 188         fprintf(ttyout, "Username for `%s': ", realm);
 189         if (guser != NULL) {
 190                 (void)strlcpy(user, guser, sizeof(user));
 191                 fprintf(ttyout, "%s\n", user);
 192         } else {
 193                 (void)fflush(ttyout);
 194                 if (fgets(user, sizeof(user) - 1, stdin) == NULL) {
 195                         clearerr(stdin);
 196                         goto cleanup_auth_url;
 197                 }
 198                 user[strlen(user) - 1] = '\0';
 199         }
 200         if (gpass != NULL)
 201                 pass = (char *)gpass;
 202         else
 203                 pass = getpass("Password: ");
 204
 205         clen = strlen(user) + strlen(pass) + 2; /* user + ":" + pass + "\0" */
 206         clear = (char *)xmalloc(clen);
 207         (void)strlcpy(clear, user, clen);
 208         (void)strlcat(clear, ":", clen);
 209         (void)strlcat(clear, pass, clen);
 210         if (gpass == NULL)
 211                 memset(pass, 0, strlen(pass));
 212
 213                                                 /* scheme + " " + enc + "\0" */
 214         rlen = strlen(scheme) + 1 + (clen + 2) * 4 / 3 + 1;
 215         *response = (char *)xmalloc(rlen);
 216         (void)strlcpy(*response, scheme, rlen);
 217         len = strlcat(*response, " ", rlen);
 218                         /* use  `clen - 1'  to not encode the trailing NUL */
 219         base64_encode((unsigned char *)clear, clen - 1,
 220             (unsigned char *)*response + len);
 221         memset(clear, 0, clen);
 222         rval = 0;
 223
 224  cleanup_auth_url:
 225         FREEPTR(clear);
 226         FREEPTR(realm);
 227         return (rval);
 228 }
 229
 230 /*
 231  * Encode len bytes starting at clear using base64 encoding into encoded,
 232  * which should be at least ((len + 2) * 4 / 3 + 1) in size.
 233  */
 234 static void
 235 base64_encode(const unsigned char *clear, size_t len, unsigned char *encoded)
 236 {
 237         static const unsigned char enc[] =
 238             "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 239         unsigned char   *cp;
 240         int      i;
 241
 242         cp = encoded;
 243         for (i = 0; i < len; i += 3) {
 244                 *(cp++) = enc[((clear[i + 0] >> 2))];
 245                 *(cp++) = enc[((clear[i + 0] << 4) & 0x30)
 246                             | ((clear[i + 1] >> 4) & 0x0f)];
 247                 *(cp++) = enc[((clear[i + 1] << 2) & 0x3c)
 248                             | ((clear[i + 2] >> 6) & 0x03)];
 249                 *(cp++) = enc[((clear[i + 2]     ) & 0x3f)];
 250         }
 251         *cp = '\0';
 252         while (i-- > len)
 253                 *(--cp) = '=';
 254 }
 255 #endif
 256
 257 /*
 258  * Decode %xx escapes in given string, `in-place'.
 259  */
 260 static void
 261 url_decode(char *url)
 262 {
 263         unsigned char *p, *q;
 264
 265         if (EMPTYSTRING(url))
 266                 return;
 267         p = q = (unsigned char *)url;
 268
 269 #define HEXTOINT(x) (x - (isdigit(x) ? '0' : (islower(x) ? 'a' : 'A') - 10))
 270         while (*p) {
 271                 if (p[0] == '%'
 272                     && p[1] && isxdigit((unsigned char)p[1])
 273                     && p[2] && isxdigit((unsigned char)p[2])) {
 274                         *q++ = HEXTOINT(p[1]) * 16 + HEXTOINT(p[2]);
 275                         p+=3;
 276                 } else
 277                         *q++ = *p++;
 278         }
 279         *q = '\0';
 280 }
 281
 282
 283 /*
 284  * Parse URL of form:
 285  *      <type>://[<user>[:<password>]@]<host>[:<port>][/<path>]
 286  * Returns -1 if a parse error occurred, otherwise 0.
 287  * It's the caller's responsibility to url_decode() the returned
 288  * user, pass and path.
 289  *
 290  * Sets type to url_t, each of the given char ** pointers to a
 291  * malloc(3)ed strings of the relevant section, and port to
 292  * the number given, or ftpport if ftp://, or httpport if http://.
 293  *
 294  * If <host> is surrounded by `[' and ']', it's parsed as an
 295  * IPv6 address (as per RFC 2732).
 296  *
 297  * XXX: this is not totally RFC 1738 compliant; <path> will have the
 298  * leading `/' unless it's an ftp:// URL, as this makes things easier
 299  * for file:// and http:// URLs. ftp:// URLs have the `/' between the
 300  * host and the URL-path removed, but any additional leading slashes
 301  * in the URL-path are retained (because they imply that we should
 302  * later do "CWD" with a null argument).
 303  *
 304  * Examples:
 305  *       input URL                       output path
 306  *       ---------                       -----------
 307  *      "ftp://host"                    NULL
 308  *      "http://host/"                  NULL
 309  *      "file://host/dir/file"          "dir/file"
 310  *      "ftp://host/"                   ""
 311  *      "ftp://host//"                  NULL
 312  *      "ftp://host//dir/file"          "/dir/file"
 313  */
 314 static int
 315 parse_url(const char *url, const char *desc, url_t *type,
 316                 char **user, char **pass, char **host, char **port,
 317                 in_port_t *portnum, char **path)
 318 {
 319         const char      *origurl;
 320         char            *cp, *ep, *thost, *tport;
 321         size_t           len;
 322
 323         if (url == NULL || desc == NULL || type == NULL || user == NULL
 324             || pass == NULL || host == NULL || port == NULL || portnum == NULL
 325             || path == NULL)
 326                 errx(1, "parse_url: invoked with NULL argument!");
 327
 328         origurl = url;
 329         *type = UNKNOWN_URL_T;
 330         *user = *pass = *host = *port = *path = NULL;
 331         *portnum = 0;
 332         tport = NULL;
 333
 334         if (STRNEQUAL(url, HTTP_URL)) {
 335                 url += sizeof(HTTP_URL) - 1;
 336                 *type = HTTP_URL_T;
 337                 *portnum = HTTP_PORT;
 338                 tport = httpport;
 339         } else if (STRNEQUAL(url, FTP_URL)) {
 340                 url += sizeof(FTP_URL) - 1;
 341                 *type = FTP_URL_T;
 342                 *portnum = FTP_PORT;
 343                 tport = ftpport;
 344         } else if (STRNEQUAL(url, FILE_URL)) {
 345                 url += sizeof(FILE_URL) - 1;
 346                 *type = FILE_URL_T;
 347         } else {
 348                 warnx("Invalid %s `%s'", desc, url);
 349  cleanup_parse_url:
 350                 FREEPTR(*user);
 351                 FREEPTR(*pass);
 352                 FREEPTR(*host);
 353                 FREEPTR(*port);
 354                 FREEPTR(*path);
 355                 return (-1);
 356         }
 357
 358         if (*url == '\0')
 359                 return (0);
 360
 361                         /* find [user[:pass]@]host[:port] */
 362         ep = strchr(url, '/');
 363         if (ep == NULL)
 364                 thost = xstrdup(url);
 365         else {
 366                 len = ep - url;
 367                 thost = (char *)xmalloc(len + 1);
 368                 (void)strlcpy(thost, url, len + 1);
 369                 if (*type == FTP_URL_T) /* skip first / for ftp URLs */
 370                         ep++;
 371                 *path = xstrdup(ep);
 372         }
 373
 374         cp = strchr(thost, '@');        /* look for user[:pass]@ in URLs */
 375         if (cp != NULL) {
 376                 if (*type == FTP_URL_T)
 377                         anonftp = 0;    /* disable anonftp */
 378                 *user = thost;
 379                 *cp = '\0';
 380                 thost = xstrdup(cp + 1);
 381                 cp = strchr(*user, ':');
 382                 if (cp != NULL) {
 383                         *cp = '\0';
 384                         *pass = xstrdup(cp + 1);
 385                 }
 386                 url_decode(*user);
 387                 if (*pass)
 388                         url_decode(*pass);
 389         }
 390
 391 #ifdef INET6
 392                         /*
 393                          * Check if thost is an encoded IPv6 address, as per
 394                          * RFC 2732:
 395                          *      `[' ipv6-address ']'
 396                          */
 397         if (*thost == '[') {
 398                 cp = thost + 1;
 399                 if ((ep = strchr(cp, ']')) == NULL ||
 400                     (ep[1] != '\0' && ep[1] != ':')) {
 401                         warnx("Invalid address `%s' in %s `%s'",
 402                             thost, desc, origurl);
 403                         goto cleanup_parse_url;
 404                 }
 405                 len = ep - cp;          /* change `[xyz]' -> `xyz' */
 406                 memmove(thost, thost + 1, len);
 407                 thost[len] = '\0';
 408                 if (! isipv6addr(thost)) {
 409                         warnx("Invalid IPv6 address `%s' in %s `%s'",
 410                             thost, desc, origurl);
 411                         goto cleanup_parse_url;
 412                 }
 413                 cp = ep + 1;
 414                 if (*cp == ':')
 415                         cp++;
 416                 else
 417                         cp = NULL;
 418         } else
 419 #endif /* INET6 */
 420             if ((cp = strchr(thost, ':')) != NULL)
 421                 *cp++ =  '\0';
 422         *host = thost;
 423
 424                         /* look for [:port] */
 425         if (cp != NULL) {
 426                 long    nport;
 427
 428                 nport = parseport(cp, -1);
 429                 if (nport == -1) {
 430                         warnx("Unknown port `%s' in %s `%s'",
 431                             cp, desc, origurl);
 432                         goto cleanup_parse_url;
 433                 }
 434                 *portnum = nport;
 435                 tport = cp;
 436         }
 437
 438         if (tport != NULL)
 439                 *port = xstrdup(tport);
 440         if (*path == NULL)
 441                 *path = xstrdup("/");
 442
 443         if (debug)
 444                 fprintf(ttyout,
 445                     "parse_url: user `%s' pass `%s' host %s port %s(%d) "
 446                     "path `%s'\n",
 447                     *user ? *user : "<null>", *pass ? *pass : "<null>",
 448                     *host ? *host : "<null>", *port ? *port : "<null>",
 449                     *portnum ? *portnum : -1, *path ? *path : "<null>");
 450
 451         return (0);
 452 }
 453
 454 sigjmp_buf      httpabort;
 455
 456 /*
 457  * Retrieve URL, via a proxy if necessary, using HTTP.
 458  * If proxyenv is set, use that for the proxy, otherwise try ftp_proxy or
 459  * http_proxy as appropriate.
 460  * Supports HTTP redirects.
 461  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
 462  * is still open (e.g, ftp xfer with trailing /)
 463  */
 464 static int
 465 fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth)
 466 {
 467         struct addrinfo         hints, *res, *res0 = NULL;
 468         int                     error;
 469         char                    hbuf[NI_MAXHOST];
 470         volatile sigfunc        oldintr, oldintp;
 471         volatile int            s;
 472         struct stat             sb;
 473         int                     ischunked, isproxy, rval, hcode;
 474         size_t                  len;
 475         static size_t           bufsize;
 476         static char             *xferbuf;
 477         const char              *cp, *token;
 478         char                    *ep, *buf, *savefile;
 479         char                    *auth, *location, *message;
 480         char                    *user, *pass, *host, *port, *path, *decodedpath;
 481         char                    *puser, *ppass, *useragent;
 482         off_t                   hashbytes, rangestart, rangeend, entitylen;
 483         int                      (*closefunc)(FILE *);
 484         FILE                    *fin, *fout;
 485         time_t                  mtime;
 486         url_t                   urltype;
 487         in_port_t               portnum;
 488
 489         oldintr = oldintp = NULL;
 490         closefunc = NULL;
 491         fin = fout = NULL;
 492         s = -1;
 493         buf = savefile = NULL;
 494         auth = location = message = NULL;
 495         ischunked = isproxy = hcode = 0;
 496         rval = 1;
 497         user = pass = host = path = decodedpath = puser = ppass = NULL;
 498
 499 #ifdef __GNUC__                 /* shut up gcc warnings */
 500         (void)&closefunc;
 501         (void)&fin;
 502         (void)&fout;
 503         (void)&buf;
 504         (void)&savefile;
 505         (void)&rval;
 506         (void)&isproxy;
 507         (void)&hcode;
 508         (void)&ischunked;
 509         (void)&message;
 510         (void)&location;
 511         (void)&auth;
 512         (void)&decodedpath;
 513 #endif
 514
 515         if (parse_url(url, "URL", &urltype, &user, &pass, &host, &port,
 516             &portnum, &path) == -1)
 517                 goto cleanup_fetch_url;
 518
 519         if (urltype == FILE_URL_T && ! EMPTYSTRING(host)
 520             && strcasecmp(host, "localhost") != 0) {
 521                 warnx("No support for non local file URL `%s'", url);
 522                 goto cleanup_fetch_url;
 523         }
 524
 525         if (EMPTYSTRING(path)) {
 526                 if (urltype == FTP_URL_T) {
 527                         rval = fetch_ftp(url);
 528                         goto cleanup_fetch_url;
 529                 }
 530                 if (urltype != HTTP_URL_T || outfile == NULL)  {
 531                         warnx("Invalid URL (no file after host) `%s'", url);
 532                         goto cleanup_fetch_url;
 533                 }
 534         }
 535
 536         decodedpath = xstrdup(path);
 537         url_decode(decodedpath);
 538
 539         if (outfile)
 540                 savefile = xstrdup(outfile);
 541         else {
 542                 cp = strrchr(decodedpath, '/');         /* find savefile */
 543                 if (cp != NULL)
 544                         savefile = xstrdup(cp + 1);
 545                 else
 546                         savefile = xstrdup(decodedpath);
 547         }
 548         if (EMPTYSTRING(savefile)) {
 549                 if (urltype == FTP_URL_T) {
 550                         rval = fetch_ftp(url);
 551                         goto cleanup_fetch_url;
 552                 }
 553                 warnx("no file after directory (you must specify an "
 554                     "output file) `%s'", url);
 555                 goto cleanup_fetch_url;
 556         } else {
 557                 if (debug)
 558                         fprintf(ttyout, "savefile `%s'\n", savefile);
 559         }
 560
 561         restart_point = 0;
 562         filesize = -1;
 563         rangestart = rangeend = entitylen = -1;
 564         mtime = -1;
 565         if (restartautofetch) {
 566                 if (strcmp(savefile, "-") != 0 && *savefile != '|' &&
 567                     stat(savefile, &sb) == 0)
 568                         restart_point = sb.st_size;
 569         }
 570         if (urltype == FILE_URL_T) {            /* file:// URLs */
 571                 direction = "copied";
 572                 fin = fopen(decodedpath, "r");
 573                 if (fin == NULL) {
 574                         warn("Cannot open file `%s'", decodedpath);
 575                         goto cleanup_fetch_url;
 576                 }
 577                 if (fstat(fileno(fin), &sb) == 0) {
 578                         mtime = sb.st_mtime;
 579                         filesize = sb.st_size;
 580                 }
 581                 if (restart_point) {
 582                         if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
 583                                 warn("Can't lseek to restart `%s'",
 584                                     decodedpath);
 585                                 goto cleanup_fetch_url;
 586                         }
 587                 }
 588                 if (verbose) {
 589                         fprintf(ttyout, "Copying %s", decodedpath);
 590                         if (restart_point)
 591                                 fprintf(ttyout, " (restarting at " LLF ")",
 592                                     (LLT)restart_point);
 593                         fputs("\n", ttyout);
 594                 }
 595         } else {                                /* ftp:// or http:// URLs */
 596                 char *leading;
 597                 int hasleading;
 598
 599                 if (proxyenv == NULL) {
 600                         if (urltype == HTTP_URL_T)
 601                                 proxyenv = getoptionvalue("http_proxy");
 602                         else if (urltype == FTP_URL_T)
 603                                 proxyenv = getoptionvalue("ftp_proxy");
 604                 }
 605                 direction = "retrieved";
 606                 if (! EMPTYSTRING(proxyenv)) {                  /* use proxy */
 607                         url_t purltype;
 608                         char *phost, *ppath;
 609                         char *pport, *no_proxy;
 610
 611                         isproxy = 1;
 612
 613                                 /* check URL against list of no_proxied sites */
 614                         no_proxy = getoptionvalue("no_proxy");
 615                         if (! EMPTYSTRING(no_proxy)) {
 616                                 char *np, *np_copy;
 617                                 long np_port;
 618                                 size_t hlen, plen;
 619
 620                                 np_copy = xstrdup(no_proxy);
 621                                 hlen = strlen(host);
 622                                 while ((cp = strsep(&np_copy, " ,")) != NULL) {
 623                                         if (*cp == '\0')
 624                                                 continue;
 625                                         if ((np = strrchr(cp, ':')) != NULL) {
 626                                                 *np = '\0';
 627                                                 np_port =
 628                                                     strtol(np + 1, &ep, 10);
 629                                                 if (*ep != '\0')
 630                                                         continue;
 631                                                 if (np_port != portnum)
 632                                                         continue;
 633                                         }
 634                                         plen = strlen(cp);
 635                                         if (hlen < plen)
 636                                                 continue;
 637                                         if (strncasecmp(host + hlen - plen,
 638                                             cp, plen) == 0) {
 639                                                 isproxy = 0;
 640                                                 break;
 641                                         }
 642                                 }
 643                                 FREEPTR(np_copy);
 644                                 if (isproxy == 0 && urltype == FTP_URL_T) {
 645                                         rval = fetch_ftp(url);
 646                                         goto cleanup_fetch_url;
 647                                 }
 648                         }
 649
 650                         if (isproxy) {
 651                                 if (parse_url(proxyenv, "proxy URL", &purltype,
 652                                     &puser, &ppass, &phost, &pport, &portnum,
 653                                     &ppath) == -1)
 654                                         goto cleanup_fetch_url;
 655
 656                                 if ((purltype != HTTP_URL_T
 657                                      && purltype != FTP_URL_T) ||
 658                                     EMPTYSTRING(phost) ||
 659                                     (! EMPTYSTRING(ppath)
 660                                      && strcmp(ppath, "/") != 0)) {
 661                                         warnx("Malformed proxy URL `%s'",
 662                                             proxyenv);
 663                                         FREEPTR(phost);
 664                                         FREEPTR(pport);
 665                                         FREEPTR(ppath);
 666                                         goto cleanup_fetch_url;
 667                                 }
 668                                 if (isipv6addr(host) &&
 669                                     strchr(host, '%') != NULL) {
 670                                         warnx(
 671 "Scoped address notation `%s' disallowed via web proxy",
 672                                             host);
 673                                         FREEPTR(phost);
 674                                         FREEPTR(pport);
 675                                         FREEPTR(ppath);
 676                                         goto cleanup_fetch_url;
 677                                 }
 678
 679                                 FREEPTR(host);
 680                                 host = phost;
 681                                 FREEPTR(port);
 682                                 port = pport;
 683                                 FREEPTR(path);
 684                                 path = xstrdup(url);
 685                                 FREEPTR(ppath);
 686                         }
 687                 } /* ! EMPTYSTRING(proxyenv) */
 688
 689                 memset(&hints, 0, sizeof(hints));
 690                 hints.ai_flags = 0;
 691                 hints.ai_family = family;
 692                 hints.ai_socktype = SOCK_STREAM;
 693                 hints.ai_protocol = 0;
 694                 error = getaddrinfo(host, NULL, &hints, &res0);
 695                 if (error) {
 696                         warnx("%s", gai_strerror(error));
 697                         goto cleanup_fetch_url;
 698                 }
 699                 if (res0->ai_canonname)
 700                         host = res0->ai_canonname;
 701
 702                 s = -1;
 703                 for (res = res0; res; res = res->ai_next) {
 704                         /*
 705                          * see comment in hookup()
 706                          */
 707                         ai_unmapped(res);
 708                         if (getnameinfo(res->ai_addr, res->ai_addrlen,
 709                             hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
 710                                 strlcpy(hbuf, "invalid", sizeof(hbuf));
 711
 712                         if (verbose && res != res0)
 713                                 fprintf(ttyout, "Trying %s...\n", hbuf);
 714
 715                         ((struct sockaddr_in *)res->ai_addr)->sin_port =
 716                             htons(portnum);
 717                         s = socket(res->ai_family, SOCK_STREAM,
 718                             res->ai_protocol);
 719                         if (s < 0) {
 720                                 warn("Can't create socket");
 721                                 continue;
 722                         }
 723
 724                         if (xconnect(s, res->ai_addr, res->ai_addrlen) < 0) {
 725                                 warn("Connect to address `%s'", hbuf);
 726                                 close(s);
 727                                 s = -1;
 728                                 continue;
 729                         }
 730
 731                         /* success */
 732                         break;
 733                 }
 734
 735                 if (s < 0) {
 736                         warn("Can't connect to %s", host);
 737                         goto cleanup_fetch_url;
 738                 }
 739
 740                 fin = fdopen(s, "r+");
 741                 /*
 742                  * Construct and send the request.
 743                  */
 744                 if (verbose)
 745                         fprintf(ttyout, "Requesting %s\n", url);
 746                 leading = "  (";
 747                 hasleading = 0;
 748                 if (isproxy) {
 749                         if (verbose) {
 750                                 fprintf(ttyout, "%svia %s:%s", leading,
 751                                     host, port);
 752                                 leading = ", ";
 753                                 hasleading++;
 754                         }
 755                         fprintf(fin, "GET %s HTTP/1.0\r\n", path);
 756                         if (flushcache)
 757                                 fprintf(fin, "Pragma: no-cache\r\n");
 758                 } else {
 759                         fprintf(fin, "GET %s HTTP/1.1\r\n", path);
 760                         if (strchr(host, ':')) {
 761                                 char *h, *p;
 762
 763                                 /*
 764                                  * strip off IPv6 scope identifier, since it is
 765                                  * local to the node
 766                                  */
 767                                 h = xstrdup(host);
 768                                 if (isipv6addr(h) &&
 769                                     (p = strchr(h, '%')) != NULL) {
 770                                         *p = '\0';
 771                                 }
 772                                 fprintf(fin, "Host: [%s]", h);
 773                                 free(h);
 774                         } else
 775                                 fprintf(fin, "Host: %s", host);
 776                         if (portnum != HTTP_PORT)
 777                                 fprintf(fin, ":%u", portnum);
 778                         fprintf(fin, "\r\n");
 779                         fprintf(fin, "Accept: */*\r\n");
 780                         fprintf(fin, "Connection: close\r\n");
 781                         if (restart_point) {
 782                                 fputs(leading, ttyout);
 783                                 fprintf(fin, "Range: bytes=" LLF "-\r\n",
 784                                     (LLT)restart_point);
 785                                 fprintf(ttyout, "restarting at " LLF,
 786                                     (LLT)restart_point);
 787                                 leading = ", ";
 788                                 hasleading++;
 789                         }
 790                         if (flushcache)
 791                                 fprintf(fin, "Cache-Control: no-cache\r\n");
 792                 }
 793                 if ((useragent=getenv("FTPUSERAGENT")) != NULL) {
 794                         fprintf(fin, "User-Agent: %s\r\n", useragent);
 795                 } else {
 796                         fprintf(fin, "User-Agent: %s/%s\r\n",
 797                             FTP_PRODUCT, FTP_VERSION);
 798                 }
 799                 if (wwwauth) {
 800                         if (verbose) {
 801                                 fprintf(ttyout, "%swith authorization",
 802                                     leading);
 803                                 leading = ", ";
 804                                 hasleading++;
 805                         }
 806                         fprintf(fin, "Authorization: %s\r\n", wwwauth);
 807                 }
 808                 if (proxyauth) {
 809                         if (verbose) {
 810                                 fprintf(ttyout,
 811                                     "%swith proxy authorization", leading);
 812                                 leading = ", ";
 813                                 hasleading++;
 814                         }
 815                         fprintf(fin, "Proxy-Authorization: %s\r\n", proxyauth);
 816                 }
 817                 if (verbose && hasleading)
 818                         fputs(")\n", ttyout);
 819                 fprintf(fin, "\r\n");
 820                 if (fflush(fin) == EOF) {
 821                         warn("Writing HTTP request");
 822                         goto cleanup_fetch_url;
 823                 }
 824
 825                                 /* Read the response */
 826                 if ((buf = fparseln(fin, &len, NULL, "\0\0\0", 0)) == NULL) {
 827                         warn("Receiving HTTP reply");
 828                         goto cleanup_fetch_url;
 829                 }
 830                 while (len > 0 && (ISLWS(buf[len-1])))
 831                         buf[--len] = '\0';
 832                 if (debug)
 833                         fprintf(ttyout, "received `%s'\n", buf);
 834
 835                                 /* Determine HTTP response code */
 836                 cp = strchr(buf, ' ');
 837                 if (cp == NULL)
 838                         goto improper;
 839                 else
 840                         cp++;
 841                 hcode = strtol(cp, &ep, 10);
 842                 if (*ep != '\0' && !isspace((unsigned char)*ep))
 843                         goto improper;
 844                 message = xstrdup(cp);
 845
 846                                 /* Read the rest of the header. */
 847                 while (1) {
 848                         FREEPTR(buf);
 849                         if ((buf = fparseln(fin, &len, NULL, "\0\0\0", 0))
 850                             == NULL) {
 851                                 warn("Receiving HTTP reply");
 852                                 goto cleanup_fetch_url;
 853                         }
 854                         while (len > 0 && (ISLWS(buf[len-1])))
 855                                 buf[--len] = '\0';
 856                         if (len == 0)
 857                                 break;
 858                         if (debug)
 859                                 fprintf(ttyout, "received `%s'\n", buf);
 860
 861                 /*
 862                  * Look for some headers
 863                  */
 864
 865                         cp = buf;
 866
 867                         if (match_token(&cp, "Content-Length:")) {
 868                                 filesize = STRTOLL(cp, &ep, 10);
 869                                 if (filesize < 0 || *ep != '\0')
 870                                         goto improper;
 871                                 if (debug)
 872                                         fprintf(ttyout,
 873                                             "parsed len as: " LLF "\n",
 874                                             (LLT)filesize);
 875
 876                         } else if (match_token(&cp, "Content-Range:")) {
 877                                 if (! match_token(&cp, "bytes"))
 878                                         goto improper;
 879
 880                                 if (*cp == '*')
 881                                         cp++;
 882                                 else {
 883                                         rangestart = STRTOLL(cp, &ep, 10);
 884                                         if (rangestart < 0 || *ep != '-')
 885                                                 goto improper;
 886                                         cp = ep + 1;
 887                                         rangeend = STRTOLL(cp, &ep, 10);
 888                                         if (rangeend < 0 || rangeend < rangestart)
 889                                                 goto improper;
 890                                         cp = ep;
 891                                 }
 892                                 if (*cp != '/')
 893                                         goto improper;
 894                                 cp++;
 895                                 if (*cp == '*')
 896                                         cp++;
 897                                 else {
 898                                         entitylen = STRTOLL(cp, &ep, 10);
 899                                         if (entitylen < 0)
 900                                                 goto improper;
 901                                         cp = ep;
 902                                 }
 903                                 if (*cp != '\0')
 904                                         goto improper;
 905
 906                                 if (debug) {
 907                                         fprintf(ttyout, "parsed range as: ");
 908                                         if (rangestart == -1)
 909                                                 fprintf(ttyout, "*");
 910                                         else
 911                                                 fprintf(ttyout, LLF "-" LLF,
 912                                                     (LLT)rangestart,
 913                                                     (LLT)rangeend);
 914                                         fprintf(ttyout, "/" LLF "\n", (LLT)entitylen);
 915                                 }
 916                                 if (! restart_point) {
 917                                         warnx(
 918                                     "Received unexpected Content-Range header");
 919                                         goto cleanup_fetch_url;
 920                                 }
 921
 922                         } else if (match_token(&cp, "Last-Modified:")) {
 923                                 struct tm parsed;
 924                                 char *t;
 925
 926                                                         /* RFC 1123 */
 927                                 if ((t = strptime(cp,
 928                                                 "%a, %d %b %Y %H:%M:%S GMT",
 929                                                 &parsed))
 930                                                         /* RFC 850 */
 931                                     || (t = strptime(cp,
 932                                                 "%a, %d-%b-%y %H:%M:%S GMT",
 933                                                 &parsed))
 934                                                         /* asctime */
 935                                     || (t = strptime(cp,
 936                                                 "%a, %b %d %H:%M:%S %Y",
 937                                                 &parsed))) {
 938                                         parsed.tm_isdst = -1;
 939                                         if (*t == '\0')
 940                                                 mtime = timegm(&parsed);
 941                                         if (debug && mtime != -1) {
 942                                                 fprintf(ttyout,
 943                                                     "parsed date as: %s",
 944                                                     ctime(&mtime));
 945                                         }
 946                                 }
 947
 948                         } else if (match_token(&cp, "Location:")) {
 949                                 location = xstrdup(cp);
 950                                 if (debug)
 951                                         fprintf(ttyout,
 952                                             "parsed location as `%s'\n", cp);
 953
 954                         } else if (match_token(&cp, "Transfer-Encoding:")) {
 955                                 if (match_token(&cp, "binary")) {
 956                                         warnx(
 957                         "Bogus transfer encoding - `binary' (fetching anyway)");
 958                                         continue;
 959                                 }
 960                                 if (! (token = match_token(&cp, "chunked"))) {
 961                                         warnx(
 962                                     "Unsupported transfer encoding - `%s'",
 963                                             token);
 964                                         goto cleanup_fetch_url;
 965                                 }
 966                                 ischunked++;
 967                                 if (debug)
 968                                         fprintf(ttyout,
 969                                             "using chunked encoding\n");
 970
 971                         } else if (match_token(&cp, "Proxy-Authenticate:")
 972                                 || match_token(&cp, "WWW-Authenticate:")) {
 973                                 if (! (token = match_token(&cp, "Basic"))) {
 974                                         if (debug)
 975                                                 fprintf(ttyout,
 976                                 "skipping unknown auth scheme `%s'\n",
 977                                                     token);
 978                                         continue;
 979                                 }
 980                                 FREEPTR(auth);
 981                                 auth = xstrdup(token);
 982                                 if (debug)
 983                                         fprintf(ttyout,
 984                                             "parsed auth as `%s'\n", cp);
 985                         }
 986
 987                 }
 988                                 /* finished parsing header */
 989                 FREEPTR(buf);
 990
 991                 switch (hcode) {
 992                 case 200:
 993                         break;
 994                 case 206:
 995                         if (! restart_point) {
 996                                 warnx("Not expecting partial content header");
 997                                 goto cleanup_fetch_url;
 998                         }
 999                         break;
1000                 case 300:
1001                 case 301:
1002                 case 302:
1003                 case 303:
1004                 case 305:
1005                         if (EMPTYSTRING(location)) {
1006                                 warnx(
1007                                 "No redirection Location provided by server");
1008                                 goto cleanup_fetch_url;
1009                         }
1010                         if (redirect_loop++ > 5) {
1011                                 warnx("Too many redirections requested");
1012                                 goto cleanup_fetch_url;
1013                         }
1014                         if (hcode == 305) {
1015                                 if (verbose)
1016                                         fprintf(ttyout, "Redirected via %s\n",
1017                                             location);
1018                                 rval = fetch_url(url, location,
1019                                     proxyauth, wwwauth);
1020                         } else {
1021                                 if (verbose)
1022                                         fprintf(ttyout, "Redirected to %s\n",
1023                                             location);
1024                                 rval = go_fetch(location);
1025                         }
1026                         goto cleanup_fetch_url;
1027 #ifndef NO_AUTH
1028                 case 401:
1029                 case 407:
1030                     {
1031                         char **authp;
1032                         char *auser, *apass;
1033
1034                         if (hcode == 401) {
1035                                 authp = &wwwauth;
1036                                 auser = user;
1037                                 apass = pass;
1038                         } else {
1039                                 authp = &proxyauth;
1040                                 auser = puser;
1041                                 apass = ppass;
1042                         }
1043                         if (verbose || *authp == NULL ||
1044                             auser == NULL || apass == NULL)
1045                                 fprintf(ttyout, "%s\n", message);
1046                         if (EMPTYSTRING(auth)) {
1047                                 warnx(
1048                             "No authentication challenge provided by server");
1049                                 goto cleanup_fetch_url;
1050                         }
1051                         if (*authp != NULL) {
1052                                 char reply[10];
1053
1054                                 fprintf(ttyout,
1055                                     "Authorization failed. Retry (y/n)? ");
1056                                 if (fgets(reply, sizeof(reply), stdin)
1057                                     == NULL) {
1058                                         clearerr(stdin);
1059                                         goto cleanup_fetch_url;
1060                                 }
1061                                 if (tolower((unsigned char)reply[0]) != 'y')
1062                                         goto cleanup_fetch_url;
1063                                 auser = NULL;
1064                                 apass = NULL;
1065                         }
1066                         if (auth_url(auth, authp, auser, apass) == 0) {
1067                                 rval = fetch_url(url, proxyenv,
1068                                     proxyauth, wwwauth);
1069                                 memset(*authp, 0, strlen(*authp));
1070                                 FREEPTR(*authp);
1071                         }
1072                         goto cleanup_fetch_url;
1073                     }
1074 #endif
1075                 default:
1076                         if (message)
1077                                 warnx("Error retrieving file - `%s'", message);
1078                         else
1079                                 warnx("Unknown error retrieving file");
1080                         goto cleanup_fetch_url;
1081                 }
1082         }               /* end of ftp:// or http:// specific setup */
1083
1084                         /* Open the output file. */
1085         if (strcmp(savefile, "-") == 0) {
1086                 fout = stdout;
1087         } else if (*savefile == '|') {
1088                 oldintp = xsignal(SIGPIPE, SIG_IGN);
1089                 fout = popen(savefile + 1, "w");
1090                 if (fout == NULL) {
1091                         warn("Can't run `%s'", savefile + 1);
1092                         goto cleanup_fetch_url;
1093                 }
1094                 closefunc = pclose;
1095         } else {
1096                 if ((rangeend != -1 && rangeend <= restart_point) ||
1097                     (rangestart == -1 && filesize != -1 && filesize <= restart_point)) {
1098                         /* already done */
1099                         if (verbose)
1100                                 fprintf(ttyout, "already done\n");
1101                         rval = 0;
1102                         goto cleanup_fetch_url;
1103                 }
1104                 if (restart_point && rangestart != -1) {
1105                         if (entitylen != -1)
1106                                 filesize = entitylen;
1107                         if (rangestart != restart_point) {
1108                                 warnx(
1109                                     "Size of `%s' differs from save file `%s'",
1110                                     url, savefile);
1111                                 goto cleanup_fetch_url;
1112                         }
1113                         fout = fopen(savefile, "a");
1114                 } else
1115                         fout = fopen(savefile, "w");
1116                 if (fout == NULL) {
1117                         warn("Can't open `%s'", savefile);
1118                         goto cleanup_fetch_url;
1119                 }
1120                 closefunc = fclose;
1121         }
1122
1123                         /* Trap signals */
1124         if (sigsetjmp(httpabort, 1))
1125                 goto cleanup_fetch_url;
1126         (void)xsignal(SIGQUIT, psummary);
1127         oldintr = xsignal(SIGINT, aborthttp);
1128
1129         if (rcvbuf_size > bufsize) {
1130                 if (xferbuf)
1131                         (void)free(xferbuf);
1132                 bufsize = rcvbuf_size;
1133                 xferbuf = xmalloc(bufsize);
1134         }
1135
1136         bytes = 0;
1137         hashbytes = mark;
1138         progressmeter(-1);
1139
1140                         /* Finally, suck down the file. */
1141         do {
1142                 long chunksize;
1143
1144                 chunksize = 0;
1145                                         /* read chunksize */
1146                 if (ischunked) {
1147                         if (fgets(xferbuf, bufsize, fin) == NULL) {
1148                                 warnx("Unexpected EOF reading chunksize");
1149                                 goto cleanup_fetch_url;
1150                         }
1151                         chunksize = strtol(xferbuf, &ep, 16);
1152
1153                                 /*
1154                                  * XXX: Work around bug in Apache 1.3.9 and
1155                                  *      1.3.11, which incorrectly put trailing
1156                                  *      space after the chunksize.
1157                                  */
1158                         while (*ep == ' ')
1159                                 ep++;
1160
1161                         if (strcmp(ep, "\r\n") != 0) {
1162                                 warnx("Unexpected data following chunksize");
1163                                 goto cleanup_fetch_url;
1164                         }
1165                         if (debug)
1166                                 fprintf(ttyout, "got chunksize of " LLF "\n",
1167                                     (LLT)chunksize);
1168                         if (chunksize == 0)
1169                                 break;
1170                 }
1171                                         /* transfer file or chunk */
1172                 while (1) {
1173                         struct timeval then, now, td;
1174                         off_t bufrem;
1175
1176                         if (rate_get)
1177                                 (void)gettimeofday(&then, NULL);
1178                         bufrem = rate_get ? rate_get : bufsize;
1179                         if (ischunked)
1180                                 bufrem = MIN(chunksize, bufrem);
1181                         while (bufrem > 0) {
1182                                 len = fread(xferbuf, sizeof(char),
1183                                     MIN(bufsize, bufrem), fin);
1184                                 if (len <= 0)
1185                                         goto chunkdone;
1186                                 bytes += len;
1187                                 bufrem -= len;
1188                                 if (fwrite(xferbuf, sizeof(char), len, fout)
1189                                     != len) {
1190                                         warn("Writing `%s'", savefile);
1191                                         goto cleanup_fetch_url;
1192                                 }
1193                                 if (hash && !progress) {
1194                                         while (bytes >= hashbytes) {
1195                                                 (void)putc('#', ttyout);
1196                                                 hashbytes += mark;
1197                                         }
1198                                         (void)fflush(ttyout);
1199                                 }
1200                                 if (ischunked) {
1201                                         chunksize -= len;
1202                                         if (chunksize <= 0)
1203                                                 break;
1204                                 }
1205                         }
1206                         if (rate_get) {
1207                                 while (1) {
1208                                         (void)gettimeofday(&now, NULL);
1209                                         timersub(&now, &then, &td);
1210                                         if (td.tv_sec > 0)
1211                                                 break;
1212                                         usleep(1000000 - td.tv_usec);
1213                                 }
1214                         }
1215                         if (ischunked && chunksize <= 0)
1216                                 break;
1217                 }
1218                                         /* read CRLF after chunk*/
1219  chunkdone:
1220                 if (ischunked) {
1221                         if (fgets(xferbuf, bufsize, fin) == NULL)
1222                                 break;
1223                         if (strcmp(xferbuf, "\r\n") != 0) {
1224                                 warnx("Unexpected data following chunk");
1225                                 goto cleanup_fetch_url;
1226                         }
1227                 }
1228         } while (ischunked);
1229         if (hash && !progress && bytes > 0) {
1230                 if (bytes < mark)
1231                         (void)putc('#', ttyout);
1232                 (void)putc('\n', ttyout);
1233         }
1234         if (ferror(fin)) {
1235                 warn("Reading file");
1236                 goto cleanup_fetch_url;
1237         }
1238         progressmeter(1);
1239         (void)fflush(fout);
1240         if (closefunc == fclose && mtime != -1) {
1241                 struct timeval tval[2];
1242
1243                 (void)gettimeofday(&tval[0], NULL);
1244                 tval[1].tv_sec = mtime;
1245                 tval[1].tv_usec = 0;
1246                 (*closefunc)(fout);
1247                 fout = NULL;
1248
1249                 if (utimes(savefile, tval) == -1) {
1250                         fprintf(ttyout,
1251                             "Can't change modification time to %s",
1252                             asctime(localtime(&mtime)));
1253                 }
1254         }
1255         if (bytes > 0)
1256                 ptransfer(0);
1257         bytes = 0;
1258
1259         rval = 0;
1260         goto cleanup_fetch_url;
1261
1262  improper:
1263         warnx("Improper response from `%s'", host);
1264
1265  cleanup_fetch_url:
1266         if (oldintr)
1267                 (void)xsignal(SIGINT, oldintr);
1268         if (oldintp)
1269                 (void)xsignal(SIGPIPE, oldintp);
1270         if (fin != NULL)
1271                 fclose(fin);
1272         else if (s != -1)
1273                 close(s);
1274         if (closefunc != NULL && fout != NULL)
1275                 (*closefunc)(fout);
1276         if (res0)
1277                 freeaddrinfo(res0);
1278         FREEPTR(savefile);
1279         FREEPTR(user);
1280         FREEPTR(pass);
1281         FREEPTR(host);
1282         FREEPTR(port);
1283         FREEPTR(path);
1284         FREEPTR(decodedpath);
1285         FREEPTR(puser);
1286         FREEPTR(ppass);
1287         FREEPTR(buf);
1288         FREEPTR(auth);
1289         FREEPTR(location);
1290         FREEPTR(message);
1291         return (rval);
1292 }
1293
1294 /*
1295  * Abort a HTTP retrieval
1296  */
1297 void
1298 aborthttp(int notused)
1299 {
1300         char msgbuf[100];
1301         int len;
1302
1303         sigint_raised = 1;
1304         alarmtimer(0);
1305         len = strlcpy(msgbuf, "\nHTTP fetch aborted.\n", sizeof(msgbuf));
1306         write(fileno(ttyout), msgbuf, len);
1307         siglongjmp(httpabort, 1);
1308 }
1309
1310 /*
1311  * Retrieve ftp URL or classic ftp argument using FTP.
1312  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1313  * is still open (e.g, ftp xfer with trailing /)
1314  */
1315 static int
1316 fetch_ftp(const char *url)
1317 {
1318         char            *cp, *xargv[5], rempath[MAXPATHLEN];
1319         char            *host, *path, *dir, *file, *user, *pass;
1320         char            *port;
1321         int              dirhasglob, filehasglob, oautologin, rval, type, xargc;
1322         in_port_t        portnum;
1323         url_t            urltype;
1324
1325         host = path = dir = file = user = pass = NULL;
1326         port = NULL;
1327         rval = 1;
1328         type = TYPE_I;
1329
1330         if (STRNEQUAL(url, FTP_URL)) {
1331                 if ((parse_url(url, "URL", &urltype, &user, &pass,
1332                     &host, &port, &portnum, &path) == -1) ||
1333                     (user != NULL && *user == '\0') ||
1334                     EMPTYSTRING(host)) {
1335                         warnx("Invalid URL `%s'", url);
1336                         goto cleanup_fetch_ftp;
1337                 }
1338                 /*
1339                  * Note: Don't url_decode(path) here.  We need to keep the
1340                  * distinction between "/" and "%2F" until later.
1341                  */
1342
1343                                         /* check for trailing ';type=[aid]' */
1344                 if (! EMPTYSTRING(path) && (cp = strrchr(path, ';')) != NULL) {
1345                         if (strcasecmp(cp, ";type=a") == 0)
1346                                 type = TYPE_A;
1347                         else if (strcasecmp(cp, ";type=i") == 0)
1348                                 type = TYPE_I;
1349                         else if (strcasecmp(cp, ";type=d") == 0) {
1350                                 warnx(
1351                             "Directory listing via a URL is not supported");
1352                                 goto cleanup_fetch_ftp;
1353                         } else {
1354                                 warnx("Invalid suffix `%s' in URL `%s'", cp,
1355                                     url);
1356                                 goto cleanup_fetch_ftp;
1357                         }
1358                         *cp = 0;
1359                 }
1360         } else {                        /* classic style `[user@]host:[file]' */
1361                 urltype = CLASSIC_URL_T;
1362                 host = xstrdup(url);
1363                 cp = strchr(host, '@');
1364                 if (cp != NULL) {
1365                         *cp = '\0';
1366                         user = host;
1367                         anonftp = 0;    /* disable anonftp */
1368                         host = xstrdup(cp + 1);
1369                 }
1370                 cp = strchr(host, ':');
1371                 if (cp != NULL) {
1372                         *cp = '\0';
1373                         path = xstrdup(cp + 1);
1374                 }
1375         }
1376         if (EMPTYSTRING(host))
1377                 goto cleanup_fetch_ftp;
1378
1379                         /* Extract the file and (if present) directory name. */
1380         dir = path;
1381         if (! EMPTYSTRING(dir)) {
1382                 /*
1383                  * If we are dealing with classic `[user@]host:[path]' syntax,
1384                  * then a path of the form `/file' (resulting from input of the
1385                  * form `host:/file') means that we should do "CWD /" before
1386                  * retrieving the file.  So we set dir="/" and file="file".
1387                  *
1388                  * But if we are dealing with URLs like `ftp://host/path' then
1389                  * a path of the form `/file' (resulting from a URL of the form
1390                  * `ftp://host//file') means that we should do `CWD ' (with an
1391                  * empty argument) before retrieving the file.  So we set
1392                  * dir="" and file="file".
1393                  *
1394                  * If the path does not contain / at all, we set dir=NULL.
1395                  * (We get a path without any slashes if we are dealing with
1396                  * classic `[user@]host:[file]' or URL `ftp://host/file'.)
1397                  *
1398                  * In all other cases, we set dir to a string that does not
1399                  * include the final '/' that separates the dir part from the
1400                  * file part of the path.  (This will be the empty string if
1401                  * and only if we are dealing with a path of the form `/file'
1402                  * resulting from an URL of the form `ftp://host//file'.)
1403                  */
1404                 cp = strrchr(dir, '/');
1405                 if (cp == dir && urltype == CLASSIC_URL_T) {
1406                         file = cp + 1;
1407                         dir = "/";
1408                 } else if (cp != NULL) {
1409                         *cp++ = '\0';
1410                         file = cp;
1411                 } else {
1412                         file = dir;
1413                         dir = NULL;
1414                 }
1415         } else
1416                 dir = NULL;
1417         if (urltype == FTP_URL_T && file != NULL) {
1418                 url_decode(file);
1419                 /* but still don't url_decode(dir) */
1420         }
1421         if (debug)
1422                 fprintf(ttyout,
1423                     "fetch_ftp: user `%s' pass `%s' host %s port %s "
1424                     "path `%s' dir `%s' file `%s'\n",
1425                     user ? user : "<null>", pass ? pass : "<null>",
1426                     host ? host : "<null>", port ? port : "<null>",
1427                     path ? path : "<null>",
1428                     dir ? dir : "<null>", file ? file : "<null>");
1429
1430         dirhasglob = filehasglob = 0;
1431         if (doglob && urltype == CLASSIC_URL_T) {
1432                 if (! EMPTYSTRING(dir) && strpbrk(dir, "*?[]{}") != NULL)
1433                         dirhasglob = 1;
1434                 if (! EMPTYSTRING(file) && strpbrk(file, "*?[]{}") != NULL)
1435                         filehasglob = 1;
1436         }
1437
1438                         /* Set up the connection */
1439         if (connected)
1440                 disconnect(0, NULL);
1441         xargv[0] = (char *)getprogname();       /* XXX discards const */
1442         xargv[1] = host;
1443         xargv[2] = NULL;
1444         xargc = 2;
1445         if (port) {
1446                 xargv[2] = port;
1447                 xargv[3] = NULL;
1448                 xargc = 3;
1449         }
1450         oautologin = autologin;
1451                 /* don't autologin in setpeer(), use ftp_login() below */
1452         autologin = 0;
1453         setpeer(xargc, xargv);
1454         autologin = oautologin;
1455         if ((connected == 0) ||
1456             (connected == 1 && !ftp_login(host, user, pass))) {
1457                 warnx("Can't connect or login to host `%s'", host);
1458                 goto cleanup_fetch_ftp;
1459         }
1460
1461         switch (type) {
1462         case TYPE_A:
1463                 setascii(1, xargv);
1464                 break;
1465         case TYPE_I:
1466                 setbinary(1, xargv);
1467                 break;
1468         default:
1469                 errx(1, "fetch_ftp: unknown transfer type %d", type);
1470         }
1471
1472                 /*
1473                  * Change directories, if necessary.
1474                  *
1475                  * Note: don't use EMPTYSTRING(dir) below, because
1476                  * dir=="" means something different from dir==NULL.
1477                  */
1478         if (dir != NULL && !dirhasglob) {
1479                 char *nextpart;
1480
1481                 /*
1482                  * If we are dealing with a classic `[user@]host:[path]'
1483                  * (urltype is CLASSIC_URL_T) then we have a raw directory
1484                  * name (not encoded in any way) and we can change
1485                  * directories in one step.
1486                  *
1487                  * If we are dealing with an `ftp://host/path' URL
1488                  * (urltype is FTP_URL_T), then RFC 1738 says we need to
1489                  * send a separate CWD command for each unescaped "/"
1490                  * in the path, and we have to interpret %hex escaping
1491                  * *after* we find the slashes.  It's possible to get
1492                  * empty components here, (from multiple adjacent
1493                  * slashes in the path) and RFC 1738 says that we should
1494                  * still do `CWD ' (with a null argument) in such cases.
1495                  *
1496                  * Many ftp servers don't support `CWD ', so if there's an
1497                  * error performing that command, bail out with a descriptive
1498                  * message.
1499                  *
1500                  * Examples:
1501                  *
1502                  * host:                        dir="", urltype=CLASSIC_URL_T
1503                  *              logged in (to default directory)
1504                  * host:file                    dir=NULL, urltype=CLASSIC_URL_T
1505                  *              "RETR file"
1506                  * host:dir/                    dir="dir", urltype=CLASSIC_URL_T
1507                  *              "CWD dir", logged in
1508                  * ftp://host/                  dir="", urltype=FTP_URL_T
1509                  *              logged in (to default directory)
1510                  * ftp://host/dir/              dir="dir", urltype=FTP_URL_T
1511                  *              "CWD dir", logged in
1512                  * ftp://host/file              dir=NULL, urltype=FTP_URL_T
1513                  *              "RETR file"
1514                  * ftp://host//file             dir="", urltype=FTP_URL_T
1515                  *              "CWD ", "RETR file"
1516                  * host:/file                   dir="/", urltype=CLASSIC_URL_T
1517                  *              "CWD /", "RETR file"
1518                  * ftp://host///file            dir="/", urltype=FTP_URL_T
1519                  *              "CWD ", "CWD ", "RETR file"
1520                  * ftp://host/%2F/file          dir="%2F", urltype=FTP_URL_T
1521                  *              "CWD /", "RETR file"
1522                  * ftp://host/foo/file          dir="foo", urltype=FTP_URL_T
1523                  *              "CWD foo", "RETR file"
1524                  * ftp://host/foo/bar/file      dir="foo/bar"
1525                  *              "CWD foo", "CWD bar", "RETR file"
1526                  * ftp://host//foo/bar/file     dir="/foo/bar"
1527                  *              "CWD ", "CWD foo", "CWD bar", "RETR file"
1528                  * ftp://host/foo//bar/file     dir="foo//bar"
1529                  *              "CWD foo", "CWD ", "CWD bar", "RETR file"
1530                  * ftp://host/%2F/foo/bar/file  dir="%2F/foo/bar"
1531                  *              "CWD /", "CWD foo", "CWD bar", "RETR file"
1532                  * ftp://host/%2Ffoo/bar/file   dir="%2Ffoo/bar"
1533                  *              "CWD /foo", "CWD bar", "RETR file"
1534                  * ftp://host/%2Ffoo%2Fbar/file dir="%2Ffoo%2Fbar"
1535                  *              "CWD /foo/bar", "RETR file"
1536                  * ftp://host/%2Ffoo%2Fbar%2Ffile       dir=NULL
1537                  *              "RETR /foo/bar/file"
1538                  *
1539                  * Note that we don't need `dir' after this point.
1540                  */
1541                 do {
1542                         if (urltype == FTP_URL_T) {
1543                                 nextpart = strchr(dir, '/');
1544                                 if (nextpart) {
1545                                         *nextpart = '\0';
1546                                         nextpart++;
1547                                 }
1548                                 url_decode(dir);
1549                         } else
1550                                 nextpart = NULL;
1551                         if (debug)
1552                                 fprintf(ttyout, "dir `%s', nextpart `%s'\n",
1553                                     dir ? dir : "<null>",
1554                                     nextpart ? nextpart : "<null>");
1555                         if (urltype == FTP_URL_T || *dir != '\0') {
1556                                 xargv[0] = "cd";
1557                                 xargv[1] = dir;
1558                                 xargv[2] = NULL;
1559                                 dirchange = 0;
1560                                 cd(2, xargv);
1561                                 if (! dirchange) {
1562                                         if (*dir == '\0' && code == 500)
1563                                                 fprintf(stderr,
1564 "\n"
1565 "ftp: The `CWD ' command (without a directory), which is required by\n"
1566 "     RFC 1738 to support the empty directory in the URL pathname (`//'),\n"
1567 "     conflicts with the server's conformance to RFC 959.\n"
1568 "     Try the same URL without the `//' in the URL pathname.\n"
1569 "\n");
1570                                         goto cleanup_fetch_ftp;
1571                                 }
1572                         }
1573                         dir = nextpart;
1574                 } while (dir != NULL);
1575         }
1576
1577         if (EMPTYSTRING(file)) {
1578                 rval = -1;
1579                 goto cleanup_fetch_ftp;
1580         }
1581
1582         if (dirhasglob) {
1583                 (void)strlcpy(rempath, dir,     sizeof(rempath));
1584                 (void)strlcat(rempath, "/",     sizeof(rempath));
1585                 (void)strlcat(rempath, file,    sizeof(rempath));
1586                 file = rempath;
1587         }
1588
1589                         /* Fetch the file(s). */
1590         xargc = 2;
1591         xargv[0] = "get";
1592         xargv[1] = file;
1593         xargv[2] = NULL;
1594         if (dirhasglob || filehasglob) {
1595                 int ointeractive;
1596
1597                 ointeractive = interactive;
1598                 interactive = 0;
1599                 if (restartautofetch)
1600                         xargv[0] = "mreget";
1601                 else
1602                         xargv[0] = "mget";
1603                 mget(xargc, xargv);
1604                 interactive = ointeractive;
1605         } else {
1606                 if (outfile == NULL) {
1607                         cp = strrchr(file, '/');        /* find savefile */
1608                         if (cp != NULL)
1609                                 outfile = cp + 1;
1610                         else
1611                                 outfile = file;
1612                 }
1613                 xargv[2] = (char *)outfile;
1614                 xargv[3] = NULL;
1615                 xargc++;
1616                 if (restartautofetch)
1617                         reget(xargc, xargv);
1618                 else
1619                         get(xargc, xargv);
1620         }
1621
1622         if ((code / 100) == COMPLETE)
1623                 rval = 0;
1624
1625  cleanup_fetch_ftp:
1626         FREEPTR(host);
1627         FREEPTR(path);
1628         FREEPTR(user);
1629         FREEPTR(pass);
1630         return (rval);
1631 }
1632
1633 /*
1634  * Retrieve the given file to outfile.
1635  * Supports arguments of the form:
1636  *      "host:path", "ftp://host/path"  if $ftpproxy, call fetch_url() else
1637  *                                      call fetch_ftp()
1638  *      "http://host/path"              call fetch_url() to use HTTP
1639  *      "file:///path"                  call fetch_url() to copy
1640  *      "about:..."                     print a message
1641  *
1642  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1643  * is still open (e.g, ftp xfer with trailing /)
1644  */
1645 static int
1646 go_fetch(const char *url)
1647 {
1648         char *proxy;
1649
1650 #ifndef NO_ABOUT
1651         /*
1652          * Check for about:*
1653          */
1654         if (STRNEQUAL(url, ABOUT_URL)) {
1655                 url += sizeof(ABOUT_URL) -1;
1656                 if (strcasecmp(url, "ftp") == 0 ||
1657                     strcasecmp(url, "tnftp") == 0) {
1658                         fputs(
1659 "This version of ftp has been enhanced by Luke Mewburn <lukem@NetBSD.org>\n"
1660 "for the NetBSD project.  Execute `man ftp' for more details.\n", ttyout);
1661                 } else if (strcasecmp(url, "lukem") == 0) {
1662                         fputs(
1663 "Luke Mewburn is the author of most of the enhancements in this ftp client.\n"
1664 "Please email feedback to <lukem@NetBSD.org>.\n", ttyout);
1665                 } else if (strcasecmp(url, "netbsd") == 0) {
1666                         fputs(
1667 "NetBSD is a freely available and redistributable UNIX-like operating system.\n"
1668 "For more information, see http://www.NetBSD.org/\n", ttyout);
1669                 } else if (strcasecmp(url, "version") == 0) {
1670                         fprintf(ttyout, "Version: %s %s%s\n",
1671                             FTP_PRODUCT, FTP_VERSION,
1672 #ifdef INET6
1673                             ""
1674 #else
1675                             " (-IPv6)"
1676 #endif
1677                         );
1678                 } else {
1679                         fprintf(ttyout, "`%s' is an interesting topic.\n", url);
1680                 }
1681                 fputs("\n", ttyout);
1682                 return (0);
1683         }
1684 #endif
1685
1686         /*
1687          * Check for file:// and http:// URLs.
1688          */
1689         if (STRNEQUAL(url, HTTP_URL) || STRNEQUAL(url, FILE_URL))
1690                 return (fetch_url(url, NULL, NULL, NULL));
1691
1692         /*
1693          * Try FTP URL-style and host:file arguments next.
1694          * If ftpproxy is set with an FTP URL, use fetch_url()
1695          * Othewise, use fetch_ftp().
1696          */
1697         proxy = getoptionvalue("ftp_proxy");
1698         if (!EMPTYSTRING(proxy) && STRNEQUAL(url, FTP_URL))
1699                 return (fetch_url(url, NULL, NULL, NULL));
1700
1701         return (fetch_ftp(url));
1702 }
1703
1704 /*
1705  * Retrieve multiple files from the command line,
1706  * calling go_fetch() for each file.
1707  *
1708  * If an ftp path has a trailing "/", the path will be cd-ed into and
1709  * the connection remains open, and the function will return -1
1710  * (to indicate the connection is alive).
1711  * If an error occurs the return value will be the offset+1 in
1712  * argv[] of the file that caused a problem (i.e, argv[x]
1713  * returns x+1)
1714  * Otherwise, 0 is returned if all files retrieved successfully.
1715  */
1716 int
1717 auto_fetch(int argc, char *argv[])
1718 {
1719         volatile int    argpos;
1720         int             rval;
1721
1722         argpos = 0;
1723
1724         if (sigsetjmp(toplevel, 1)) {
1725                 if (connected)
1726                         disconnect(0, NULL);
1727                 if (rval > 0)
1728                         rval = argpos + 1;
1729                 return (rval);
1730         }
1731         (void)xsignal(SIGINT, intr);
1732         (void)xsignal(SIGPIPE, lostpeer);
1733
1734         /*
1735          * Loop through as long as there's files to fetch.
1736          */
1737         for (rval = 0; (rval == 0) && (argpos < argc); argpos++) {
1738                 if (strchr(argv[argpos], ':') == NULL)
1739                         break;
1740                 redirect_loop = 0;
1741                 if (!anonftp)
1742                         anonftp = 2;    /* Handle "automatic" transfers. */
1743                 rval = go_fetch(argv[argpos]);
1744                 if (outfile != NULL && strcmp(outfile, "-") != 0
1745                     && outfile[0] != '|')
1746                         outfile = NULL;
1747                 if (rval > 0)
1748                         rval = argpos + 1;
1749         }
1750
1751         if (connected && rval != -1)
1752                 disconnect(0, NULL);
1753         return (rval);
1754 }
1755
1756
1757 int
1758 auto_put(int argc, char **argv, const char *uploadserver)
1759 {
1760         char    *uargv[4], *path, *pathsep;
1761         int      uargc, rval, len;
1762
1763         uargc = 0;
1764         uargv[uargc++] = "mput";
1765         uargv[uargc++] = argv[0];
1766         uargv[2] = uargv[3] = NULL;
1767         pathsep = NULL;
1768         rval = 1;
1769
1770         if (debug)
1771                 fprintf(ttyout, "auto_put: target `%s'\n", uploadserver);
1772
1773         path = xstrdup(uploadserver);
1774         len = strlen(path);
1775         if (path[len - 1] != '/' && path[len - 1] != ':') {
1776                         /*
1777                          * make sure we always pass a directory to auto_fetch
1778                          */
1779                 if (argc > 1) {         /* more than one file to upload */
1780                         int len;
1781
1782                         len = strlen(uploadserver) + 2; /* path + "/" + "\0" */
1783                         free(path);
1784                         path = (char *)xmalloc(len);
1785                         (void)strlcpy(path, uploadserver, len);
1786                         (void)strlcat(path, "/", len);
1787                 } else {                /* single file to upload */
1788                         uargv[0] = "put";
1789                         pathsep = strrchr(path, '/');
1790                         if (pathsep == NULL) {
1791                                 pathsep = strrchr(path, ':');
1792                                 if (pathsep == NULL) {
1793                                         warnx("Invalid URL `%s'", path);
1794                                         goto cleanup_auto_put;
1795                                 }
1796                                 pathsep++;
1797                                 uargv[2] = xstrdup(pathsep);
1798                                 pathsep[0] = '/';
1799                         } else
1800                                 uargv[2] = xstrdup(pathsep + 1);
1801                         pathsep[1] = '\0';
1802                         uargc++;
1803                 }
1804         }
1805         if (debug)
1806                 fprintf(ttyout, "auto_put: URL `%s' argv[2] `%s'\n",
1807                     path, uargv[2] ? uargv[2] : "<null>");
1808
1809                         /* connect and cwd */
1810         rval = auto_fetch(1, &path);
1811         free(path);
1812         if(rval >= 0)
1813                 goto cleanup_auto_put;
1814
1815                         /* XXX : is this the best way? */
1816         if (uargc == 3) {
1817                 uargv[1] = argv[0];
1818                 put(uargc, uargv);
1819                 goto cleanup_auto_put;
1820         }
1821
1822         for(; argv[0] != NULL; argv++) {
1823                 uargv[1] = argv[0];
1824                 mput(uargc, uargv);
1825         }
1826         rval = 0;
1827
1828  cleanup_auto_put:
1829         FREEPTR(uargv[2]);
1830         return (rval);
1831 }