contrib/lukemftp/fetch.c

   1 /*      $NetBSD: fetch.c,v 1.164 2005/08/21 16:16:33 lukem Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1997-2005 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Luke Mewburn.
   9  *
  10  * This code is derived from software contributed to The NetBSD Foundation
  11  * by Scott Aaron Bamford.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the NetBSD
  24  *      Foundation, Inc. and its contributors.
  25  * 4. Neither the name of The NetBSD Foundation nor the names of its
  26  *    contributors may be used to endorse or promote products derived
  27  *    from this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  30  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  31  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  32  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  33  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  34  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  35  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  36  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  37  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  39  * POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 #include <sys/cdefs.h>
  43 #ifndef lint
  44 __RCSID("$NetBSD: fetch.c,v 1.164 2005/08/21 16:16:33 lukem Exp $");
  45 #endif /* not lint */
  46
  47 /*
  48  * FTP User Program -- Command line file retrieval
  49  */
  50
  51 #include <sys/types.h>
  52 #include <sys/param.h>
  53 #include <sys/socket.h>
  54 #include <sys/stat.h>
  55 #include <sys/time.h>
  56
  57 #include <netinet/in.h>
  58
  59 #include <arpa/ftp.h>
  60 #include <arpa/inet.h>
  61
  62 #include <ctype.h>
  63 #include <err.h>
  64 #include <errno.h>
  65 #include <netdb.h>
  66 #include <fcntl.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71 #include <time.h>
  72
  73 #include "ftp_var.h"
  74 #include "version.h"
  75
  76 typedef enum {
  77         UNKNOWN_URL_T=-1,
  78         HTTP_URL_T,
  79         FTP_URL_T,
  80         FILE_URL_T,
  81         CLASSIC_URL_T
  82 } url_t;
  83
  84 void            aborthttp(int);
  85 #ifndef NO_AUTH
  86 static int      auth_url(const char *, char **, const char *, const char *);
  87 static void     base64_encode(const unsigned char *, size_t, unsigned char *);
  88 #endif
  89 static int      go_fetch(const char *);
  90 static int      fetch_ftp(const char *);
  91 static int      fetch_url(const char *, const char *, char *, char *);
  92 static const char *match_token(const char **, const char *);
  93 static int      parse_url(const char *, const char *, url_t *, char **,
  94                             char **, char **, char **, in_port_t *, char **);
  95 static void     url_decode(char *);
  96
  97 static int      redirect_loop;
  98
  99
 100 #define STRNEQUAL(a,b)  (strncasecmp((a), (b), sizeof((b))-1) == 0)
 101 #define ISLWS(x)        ((x)=='\r' || (x)=='\n' || (x)==' ' || (x)=='\t')
 102 #define SKIPLWS(x)      do { while (ISLWS((*x))) x++; } while (0)
 103
 104
 105 #define ABOUT_URL       "about:"        /* propaganda */
 106 #define FILE_URL        "file://"       /* file URL prefix */
 107 #define FTP_URL         "ftp://"        /* ftp URL prefix */
 108 #define HTTP_URL        "http://"       /* http URL prefix */
 109
 110
 111 /*
 112  * Determine if token is the next word in buf (case insensitive).
 113  * If so, advance buf past the token and any trailing LWS, and
 114  * return a pointer to the token (in buf).  Otherwise, return NULL.
 115  * token may be preceeded by LWS.
 116  * token must be followed by LWS or NUL.  (I.e, don't partial match).
 117  */
 118 static const char *
 119 match_token(const char **buf, const char *token)
 120 {
 121         const char      *p, *orig;
 122         size_t          tlen;
 123
 124         tlen = strlen(token);
 125         p = *buf;
 126         SKIPLWS(p);
 127         orig = p;
 128         if (strncasecmp(p, token, tlen) != 0)
 129                 return NULL;
 130         p += tlen;
 131         if (*p != '\0' && !ISLWS(*p))
 132                 return NULL;
 133         SKIPLWS(p);
 134         orig = *buf;
 135         *buf = p;
 136         return orig;
 137 }
 138
 139 #ifndef NO_AUTH
 140 /*
 141  * Generate authorization response based on given authentication challenge.
 142  * Returns -1 if an error occurred, otherwise 0.
 143  * Sets response to a malloc(3)ed string; caller should free.
 144  */
 145 static int
 146 auth_url(const char *challenge, char **response, const char *guser,
 147         const char *gpass)
 148 {
 149         const char      *cp, *scheme, *errormsg;
 150         char            *ep, *clear, *realm;
 151         char             user[BUFSIZ], *pass;
 152         int              rval;
 153         size_t           len, clen, rlen;
 154
 155         *response = NULL;
 156         clear = realm = NULL;
 157         rval = -1;
 158         cp = challenge;
 159         scheme = "Basic";       /* only support Basic authentication */
 160
 161         DPRINTF("auth_url: challenge `%s'\n", challenge);
 162
 163         if (! match_token(&cp, scheme)) {
 164                 warnx("Unsupported authentication challenge - `%s'",
 165                     challenge);
 166                 goto cleanup_auth_url;
 167         }
 168
 169 #define REALM "realm=\""
 170         if (STRNEQUAL(cp, REALM))
 171                 cp += sizeof(REALM) - 1;
 172         else {
 173                 warnx("Unsupported authentication challenge - `%s'",
 174                     challenge);
 175                 goto cleanup_auth_url;
 176         }
 177 /* XXX: need to improve quoted-string parsing to support \ quoting, etc. */
 178         if ((ep = strchr(cp, '\"')) != NULL) {
 179                 size_t len = ep - cp;
 180
 181                 realm = (char *)xmalloc(len + 1);
 182                 (void)strlcpy(realm, cp, len + 1);
 183         } else {
 184                 warnx("Unsupported authentication challenge - `%s'",
 185                     challenge);
 186                 goto cleanup_auth_url;
 187         }
 188
 189         fprintf(ttyout, "Username for `%s': ", realm);
 190         if (guser != NULL) {
 191                 (void)strlcpy(user, guser, sizeof(user));
 192                 fprintf(ttyout, "%s\n", user);
 193         } else {
 194                 (void)fflush(ttyout);
 195                 if (getline(stdin, user, sizeof(user), &errormsg) < 0) {
 196                         warnx("%s; can't authenticate", errormsg);
 197                         goto cleanup_auth_url;
 198                 }
 199         }
 200         if (gpass != NULL)
 201                 pass = (char *)gpass;
 202         else
 203                 pass = getpass("Password: ");
 204
 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                 if (*pass != NULL)
 352                         memset(*pass, 0, strlen(*pass));
 353                 FREEPTR(*pass);
 354                 FREEPTR(*host);
 355                 FREEPTR(*port);
 356                 FREEPTR(*path);
 357                 return (-1);
 358         }
 359
 360         if (*url == '\0')
 361                 return (0);
 362
 363                         /* find [user[:pass]@]host[:port] */
 364         ep = strchr(url, '/');
 365         if (ep == NULL)
 366                 thost = xstrdup(url);
 367         else {
 368                 len = ep - url;
 369                 thost = (char *)xmalloc(len + 1);
 370                 (void)strlcpy(thost, url, len + 1);
 371                 if (*type == FTP_URL_T) /* skip first / for ftp URLs */
 372                         ep++;
 373                 *path = xstrdup(ep);
 374         }
 375
 376         cp = strchr(thost, '@');        /* look for user[:pass]@ in URLs */
 377         if (cp != NULL) {
 378                 if (*type == FTP_URL_T)
 379                         anonftp = 0;    /* disable anonftp */
 380                 *user = thost;
 381                 *cp = '\0';
 382                 thost = xstrdup(cp + 1);
 383                 cp = strchr(*user, ':');
 384                 if (cp != NULL) {
 385                         *cp = '\0';
 386                         *pass = xstrdup(cp + 1);
 387                 }
 388                 url_decode(*user);
 389                 if (*pass)
 390                         url_decode(*pass);
 391         }
 392
 393 #ifdef INET6
 394                         /*
 395                          * Check if thost is an encoded IPv6 address, as per
 396                          * RFC 2732:
 397                          *      `[' ipv6-address ']'
 398                          */
 399         if (*thost == '[') {
 400                 cp = thost + 1;
 401                 if ((ep = strchr(cp, ']')) == NULL ||
 402                     (ep[1] != '\0' && ep[1] != ':')) {
 403                         warnx("Invalid address `%s' in %s `%s'",
 404                             thost, desc, origurl);
 405                         goto cleanup_parse_url;
 406                 }
 407                 len = ep - cp;          /* change `[xyz]' -> `xyz' */
 408                 memmove(thost, thost + 1, len);
 409                 thost[len] = '\0';
 410                 if (! isipv6addr(thost)) {
 411                         warnx("Invalid IPv6 address `%s' in %s `%s'",
 412                             thost, desc, origurl);
 413                         goto cleanup_parse_url;
 414                 }
 415                 cp = ep + 1;
 416                 if (*cp == ':')
 417                         cp++;
 418                 else
 419                         cp = NULL;
 420         } else
 421 #endif /* INET6 */
 422             if ((cp = strchr(thost, ':')) != NULL)
 423                 *cp++ =  '\0';
 424         *host = thost;
 425
 426                         /* look for [:port] */
 427         if (cp != NULL) {
 428                 long    nport;
 429
 430                 nport = parseport(cp, -1);
 431                 if (nport == -1) {
 432                         warnx("Unknown port `%s' in %s `%s'",
 433                             cp, desc, origurl);
 434                         goto cleanup_parse_url;
 435                 }
 436                 *portnum = nport;
 437                 tport = cp;
 438         }
 439
 440         if (tport != NULL)
 441                 *port = xstrdup(tport);
 442         if (*path == NULL)
 443                 *path = xstrdup("/");
 444
 445         DPRINTF("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                 DPRINTF("savefile `%s'\n", savefile);
 558         }
 559
 560         restart_point = 0;
 561         filesize = -1;
 562         rangestart = rangeend = entitylen = -1;
 563         mtime = -1;
 564         if (restartautofetch) {
 565                 if (strcmp(savefile, "-") != 0 && *savefile != '|' &&
 566                     stat(savefile, &sb) == 0)
 567                         restart_point = sb.st_size;
 568         }
 569         if (urltype == FILE_URL_T) {            /* file:// URLs */
 570                 direction = "copied";
 571                 fin = fopen(decodedpath, "r");
 572                 if (fin == NULL) {
 573                         warn("Cannot open file `%s'", decodedpath);
 574                         goto cleanup_fetch_url;
 575                 }
 576                 if (fstat(fileno(fin), &sb) == 0) {
 577                         mtime = sb.st_mtime;
 578                         filesize = sb.st_size;
 579                 }
 580                 if (restart_point) {
 581                         if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
 582                                 warn("Can't lseek to restart `%s'",
 583                                     decodedpath);
 584                                 goto cleanup_fetch_url;
 585                         }
 586                 }
 587                 if (verbose) {
 588                         fprintf(ttyout, "Copying %s", decodedpath);
 589                         if (restart_point)
 590                                 fprintf(ttyout, " (restarting at " LLF ")",
 591                                     (LLT)restart_point);
 592                         fputs("\n", ttyout);
 593                 }
 594         } else {                                /* ftp:// or http:// URLs */
 595                 char *leading;
 596                 int hasleading;
 597
 598                 if (proxyenv == NULL) {
 599                         if (urltype == HTTP_URL_T)
 600                                 proxyenv = getoptionvalue("http_proxy");
 601                         else if (urltype == FTP_URL_T)
 602                                 proxyenv = getoptionvalue("ftp_proxy");
 603                 }
 604                 direction = "retrieved";
 605                 if (! EMPTYSTRING(proxyenv)) {                  /* use proxy */
 606                         url_t purltype;
 607                         char *phost, *ppath;
 608                         char *pport, *no_proxy;
 609
 610                         isproxy = 1;
 611
 612                                 /* check URL against list of no_proxied sites */
 613                         no_proxy = getoptionvalue("no_proxy");
 614                         if (! EMPTYSTRING(no_proxy)) {
 615                                 char *np, *np_copy;
 616                                 long np_port;
 617                                 size_t hlen, plen;
 618
 619                                 np_copy = xstrdup(no_proxy);
 620                                 hlen = strlen(host);
 621                                 while ((cp = strsep(&np_copy, " ,")) != NULL) {
 622                                         if (*cp == '\0')
 623                                                 continue;
 624                                         if ((np = strrchr(cp, ':')) != NULL) {
 625                                                 *np = '\0';
 626                                                 np_port =
 627                                                     strtol(np + 1, &ep, 10);
 628                                                 if (*ep != '\0')
 629                                                         continue;
 630                                                 if (np_port != portnum)
 631                                                         continue;
 632                                         }
 633                                         plen = strlen(cp);
 634                                         if (hlen < plen)
 635                                                 continue;
 636                                         if (strncasecmp(host + hlen - plen,
 637                                             cp, plen) == 0) {
 638                                                 isproxy = 0;
 639                                                 break;
 640                                         }
 641                                 }
 642                                 FREEPTR(np_copy);
 643                                 if (isproxy == 0 && urltype == FTP_URL_T) {
 644                                         rval = fetch_ftp(url);
 645                                         goto cleanup_fetch_url;
 646                                 }
 647                         }
 648
 649                         if (isproxy) {
 650                                 if (parse_url(proxyenv, "proxy URL", &purltype,
 651                                     &puser, &ppass, &phost, &pport, &portnum,
 652                                     &ppath) == -1)
 653                                         goto cleanup_fetch_url;
 654
 655                                 if ((purltype != HTTP_URL_T
 656                                      && purltype != FTP_URL_T) ||
 657                                     EMPTYSTRING(phost) ||
 658                                     (! EMPTYSTRING(ppath)
 659                                      && strcmp(ppath, "/") != 0)) {
 660                                         warnx("Malformed proxy URL `%s'",
 661                                             proxyenv);
 662                                         FREEPTR(phost);
 663                                         FREEPTR(pport);
 664                                         FREEPTR(ppath);
 665                                         goto cleanup_fetch_url;
 666                                 }
 667                                 if (isipv6addr(host) &&
 668                                     strchr(host, '%') != NULL) {
 669                                         warnx(
 670 "Scoped address notation `%s' disallowed via web proxy",
 671                                             host);
 672                                         FREEPTR(phost);
 673                                         FREEPTR(pport);
 674                                         FREEPTR(ppath);
 675                                         goto cleanup_fetch_url;
 676                                 }
 677
 678                                 FREEPTR(host);
 679                                 host = phost;
 680                                 FREEPTR(port);
 681                                 port = pport;
 682                                 FREEPTR(path);
 683                                 path = xstrdup(url);
 684                                 FREEPTR(ppath);
 685                         }
 686                 } /* ! EMPTYSTRING(proxyenv) */
 687
 688                 memset(&hints, 0, sizeof(hints));
 689                 hints.ai_flags = 0;
 690                 hints.ai_family = family;
 691                 hints.ai_socktype = SOCK_STREAM;
 692                 hints.ai_protocol = 0;
 693                 error = getaddrinfo(host, NULL, &hints, &res0);
 694                 if (error) {
 695                         warnx("%s: %s", host, gai_strerror(error));
 696                         goto cleanup_fetch_url;
 697                 }
 698                 if (res0->ai_canonname)
 699                         host = res0->ai_canonname;
 700
 701                 s = -1;
 702                 for (res = res0; res; res = res->ai_next) {
 703                         /*
 704                          * see comment in hookup()
 705                          */
 706                         ai_unmapped(res);
 707                         if (getnameinfo(res->ai_addr, res->ai_addrlen,
 708                             hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
 709                                 strlcpy(hbuf, "invalid", sizeof(hbuf));
 710
 711                         if (verbose && res0->ai_next) {
 712                                 fprintf(ttyout, "Trying %s...\n", hbuf);
 713                         }
 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                 DPRINTF("received `%s'\n", buf);
 833
 834                                 /* Determine HTTP response code */
 835                 cp = strchr(buf, ' ');
 836                 if (cp == NULL)
 837                         goto improper;
 838                 else
 839                         cp++;
 840                 hcode = strtol(cp, &ep, 10);
 841                 if (*ep != '\0' && !isspace((unsigned char)*ep))
 842                         goto improper;
 843                 message = xstrdup(cp);
 844
 845                                 /* Read the rest of the header. */
 846                 while (1) {
 847                         FREEPTR(buf);
 848                         if ((buf = fparseln(fin, &len, NULL, "\0\0\0", 0))
 849                             == NULL) {
 850                                 warn("Receiving HTTP reply");
 851                                 goto cleanup_fetch_url;
 852                         }
 853                         while (len > 0 && (ISLWS(buf[len-1])))
 854                                 buf[--len] = '\0';
 855                         if (len == 0)
 856                                 break;
 857                         DPRINTF("received `%s'\n", buf);
 858
 859                 /*
 860                  * Look for some headers
 861                  */
 862
 863                         cp = buf;
 864
 865                         if (match_token(&cp, "Content-Length:")) {
 866                                 filesize = STRTOLL(cp, &ep, 10);
 867                                 if (filesize < 0 || *ep != '\0')
 868                                         goto improper;
 869                                 DPRINTF("parsed len as: " LLF "\n",
 870                                     (LLT)filesize);
 871
 872                         } else if (match_token(&cp, "Content-Range:")) {
 873                                 if (! match_token(&cp, "bytes"))
 874                                         goto improper;
 875
 876                                 if (*cp == '*')
 877                                         cp++;
 878                                 else {
 879                                         rangestart = STRTOLL(cp, &ep, 10);
 880                                         if (rangestart < 0 || *ep != '-')
 881                                                 goto improper;
 882                                         cp = ep + 1;
 883                                         rangeend = STRTOLL(cp, &ep, 10);
 884                                         if (rangeend < 0 || rangeend < rangestart)
 885                                                 goto improper;
 886                                         cp = ep;
 887                                 }
 888                                 if (*cp != '/')
 889                                         goto improper;
 890                                 cp++;
 891                                 if (*cp == '*')
 892                                         cp++;
 893                                 else {
 894                                         entitylen = STRTOLL(cp, &ep, 10);
 895                                         if (entitylen < 0)
 896                                                 goto improper;
 897                                         cp = ep;
 898                                 }
 899                                 if (*cp != '\0')
 900                                         goto improper;
 901
 902 #ifndef NO_DEBUG
 903                                 if (debug) {
 904                                         fprintf(ttyout, "parsed range as: ");
 905                                         if (rangestart == -1)
 906                                                 fprintf(ttyout, "*");
 907                                         else
 908                                                 fprintf(ttyout, LLF "-" LLF,
 909                                                     (LLT)rangestart,
 910                                                     (LLT)rangeend);
 911                                         fprintf(ttyout, "/" LLF "\n", (LLT)entitylen);
 912                                 }
 913 #endif
 914                                 if (! restart_point) {
 915                                         warnx(
 916                                     "Received unexpected Content-Range header");
 917                                         goto cleanup_fetch_url;
 918                                 }
 919
 920                         } else if (match_token(&cp, "Last-Modified:")) {
 921                                 struct tm parsed;
 922                                 char *t;
 923
 924                                                         /* RFC 1123 */
 925                                 if ((t = strptime(cp,
 926                                                 "%a, %d %b %Y %H:%M:%S GMT",
 927                                                 &parsed))
 928                                                         /* RFC 850 */
 929                                     || (t = strptime(cp,
 930                                                 "%a, %d-%b-%y %H:%M:%S GMT",
 931                                                 &parsed))
 932                                                         /* asctime */
 933                                     || (t = strptime(cp,
 934                                                 "%a, %b %d %H:%M:%S %Y",
 935                                                 &parsed))) {
 936                                         parsed.tm_isdst = -1;
 937                                         if (*t == '\0')
 938                                                 mtime = timegm(&parsed);
 939 #ifndef NO_DEBUG
 940                                         if (debug && mtime != -1) {
 941                                                 fprintf(ttyout,
 942                                                     "parsed date as: %s",
 943                                                     ctime(&mtime));
 944                                         }
 945 #endif
 946                                 }
 947
 948                         } else if (match_token(&cp, "Location:")) {
 949                                 location = xstrdup(cp);
 950                                 DPRINTF("parsed location as `%s'\n", cp);
 951
 952                         } else if (match_token(&cp, "Transfer-Encoding:")) {
 953                                 if (match_token(&cp, "binary")) {
 954                                         warnx(
 955                         "Bogus transfer encoding - `binary' (fetching anyway)");
 956                                         continue;
 957                                 }
 958                                 if (! (token = match_token(&cp, "chunked"))) {
 959                                         warnx(
 960                                     "Unsupported transfer encoding - `%s'",
 961                                             token);
 962                                         goto cleanup_fetch_url;
 963                                 }
 964                                 ischunked++;
 965                                 DPRINTF("using chunked encoding\n");
 966
 967                         } else if (match_token(&cp, "Proxy-Authenticate:")
 968                                 || match_token(&cp, "WWW-Authenticate:")) {
 969                                 if (! (token = match_token(&cp, "Basic"))) {
 970                                         DPRINTF(
 971                                 "skipping unknown auth scheme `%s'\n",
 972                                                     token);
 973                                         continue;
 974                                 }
 975                                 FREEPTR(auth);
 976                                 auth = xstrdup(token);
 977                                 DPRINTF("parsed auth as `%s'\n", cp);
 978                         }
 979
 980                 }
 981                                 /* finished parsing header */
 982                 FREEPTR(buf);
 983
 984                 switch (hcode) {
 985                 case 200:
 986                         break;
 987                 case 206:
 988                         if (! restart_point) {
 989                                 warnx("Not expecting partial content header");
 990                                 goto cleanup_fetch_url;
 991                         }
 992                         break;
 993                 case 300:
 994                 case 301:
 995                 case 302:
 996                 case 303:
 997                 case 305:
 998                         if (EMPTYSTRING(location)) {
 999                                 warnx(
1000                                 "No redirection Location provided by server");
1001                                 goto cleanup_fetch_url;
1002                         }
1003                         if (redirect_loop++ > 5) {
1004                                 warnx("Too many redirections requested");
1005                                 goto cleanup_fetch_url;
1006                         }
1007                         if (hcode == 305) {
1008                                 if (verbose)
1009                                         fprintf(ttyout, "Redirected via %s\n",
1010                                             location);
1011                                 rval = fetch_url(url, location,
1012                                     proxyauth, wwwauth);
1013                         } else {
1014                                 if (verbose)
1015                                         fprintf(ttyout, "Redirected to %s\n",
1016                                             location);
1017                                 rval = go_fetch(location);
1018                         }
1019                         goto cleanup_fetch_url;
1020 #ifndef NO_AUTH
1021                 case 401:
1022                 case 407:
1023                     {
1024                         char **authp;
1025                         char *auser, *apass;
1026
1027                         if (hcode == 401) {
1028                                 authp = &wwwauth;
1029                                 auser = user;
1030                                 apass = pass;
1031                         } else {
1032                                 authp = &proxyauth;
1033                                 auser = puser;
1034                                 apass = ppass;
1035                         }
1036                         if (verbose || *authp == NULL ||
1037                             auser == NULL || apass == NULL)
1038                                 fprintf(ttyout, "%s\n", message);
1039                         if (EMPTYSTRING(auth)) {
1040                                 warnx(
1041                             "No authentication challenge provided by server");
1042                                 goto cleanup_fetch_url;
1043                         }
1044                         if (*authp != NULL) {
1045                                 char reply[10];
1046
1047                                 fprintf(ttyout,
1048                                     "Authorization failed. Retry (y/n)? ");
1049                                 if (getline(stdin, reply, sizeof(reply), NULL)
1050                                     < 0) {
1051                                         goto cleanup_fetch_url;
1052                                 }
1053                                 if (tolower((unsigned char)reply[0]) != 'y')
1054                                         goto cleanup_fetch_url;
1055                                 auser = NULL;
1056                                 apass = NULL;
1057                         }
1058                         if (auth_url(auth, authp, auser, apass) == 0) {
1059                                 rval = fetch_url(url, proxyenv,
1060                                     proxyauth, wwwauth);
1061                                 memset(*authp, 0, strlen(*authp));
1062                                 FREEPTR(*authp);
1063                         }
1064                         goto cleanup_fetch_url;
1065                     }
1066 #endif
1067                 default:
1068                         if (message)
1069                                 warnx("Error retrieving file - `%s'", message);
1070                         else
1071                                 warnx("Unknown error retrieving file");
1072                         goto cleanup_fetch_url;
1073                 }
1074         }               /* end of ftp:// or http:// specific setup */
1075
1076                         /* Open the output file. */
1077         if (strcmp(savefile, "-") == 0) {
1078                 fout = stdout;
1079         } else if (*savefile == '|') {
1080                 oldintp = xsignal(SIGPIPE, SIG_IGN);
1081                 fout = popen(savefile + 1, "w");
1082                 if (fout == NULL) {
1083                         warn("Can't run `%s'", savefile + 1);
1084                         goto cleanup_fetch_url;
1085                 }
1086                 closefunc = pclose;
1087         } else {
1088                 if ((rangeend != -1 && rangeend <= restart_point) ||
1089                     (rangestart == -1 && filesize != -1 && filesize <= restart_point)) {
1090                         /* already done */
1091                         if (verbose)
1092                                 fprintf(ttyout, "already done\n");
1093                         rval = 0;
1094                         goto cleanup_fetch_url;
1095                 }
1096                 if (restart_point && rangestart != -1) {
1097                         if (entitylen != -1)
1098                                 filesize = entitylen;
1099                         if (rangestart != restart_point) {
1100                                 warnx(
1101                                     "Size of `%s' differs from save file `%s'",
1102                                     url, savefile);
1103                                 goto cleanup_fetch_url;
1104                         }
1105                         fout = fopen(savefile, "a");
1106                 } else
1107                         fout = fopen(savefile, "w");
1108                 if (fout == NULL) {
1109                         warn("Can't open `%s'", savefile);
1110                         goto cleanup_fetch_url;
1111                 }
1112                 closefunc = fclose;
1113         }
1114
1115                         /* Trap signals */
1116         if (sigsetjmp(httpabort, 1))
1117                 goto cleanup_fetch_url;
1118         (void)xsignal(SIGQUIT, psummary);
1119         oldintr = xsignal(SIGINT, aborthttp);
1120
1121         if (rcvbuf_size > bufsize) {
1122                 if (xferbuf)
1123                         (void)free(xferbuf);
1124                 bufsize = rcvbuf_size;
1125                 xferbuf = xmalloc(bufsize);
1126         }
1127
1128         bytes = 0;
1129         hashbytes = mark;
1130         progressmeter(-1);
1131
1132                         /* Finally, suck down the file. */
1133         do {
1134                 long chunksize;
1135
1136                 chunksize = 0;
1137                                         /* read chunksize */
1138                 if (ischunked) {
1139                         if (fgets(xferbuf, bufsize, fin) == NULL) {
1140                                 warnx("Unexpected EOF reading chunksize");
1141                                 goto cleanup_fetch_url;
1142                         }
1143                         chunksize = strtol(xferbuf, &ep, 16);
1144
1145                                 /*
1146                                  * XXX: Work around bug in Apache 1.3.9 and
1147                                  *      1.3.11, which incorrectly put trailing
1148                                  *      space after the chunksize.
1149                                  */
1150                         while (*ep == ' ')
1151                                 ep++;
1152
1153                         if (strcmp(ep, "\r\n") != 0) {
1154                                 warnx("Unexpected data following chunksize");
1155                                 goto cleanup_fetch_url;
1156                         }
1157                         DPRINTF("got chunksize of " LLF "\n", (LLT)chunksize);
1158                         if (chunksize == 0)
1159                                 break;
1160                 }
1161                                         /* transfer file or chunk */
1162                 while (1) {
1163                         struct timeval then, now, td;
1164                         off_t bufrem;
1165
1166                         if (rate_get)
1167                                 (void)gettimeofday(&then, NULL);
1168                         bufrem = rate_get ? rate_get : bufsize;
1169                         if (ischunked)
1170                                 bufrem = MIN(chunksize, bufrem);
1171                         while (bufrem > 0) {
1172                                 len = fread(xferbuf, sizeof(char),
1173                                     MIN(bufsize, bufrem), fin);
1174                                 if (len <= 0)
1175                                         goto chunkdone;
1176                                 bytes += len;
1177                                 bufrem -= len;
1178                                 if (fwrite(xferbuf, sizeof(char), len, fout)
1179                                     != len) {
1180                                         warn("Writing `%s'", savefile);
1181                                         goto cleanup_fetch_url;
1182                                 }
1183                                 if (hash && !progress) {
1184                                         while (bytes >= hashbytes) {
1185                                                 (void)putc('#', ttyout);
1186                                                 hashbytes += mark;
1187                                         }
1188                                         (void)fflush(ttyout);
1189                                 }
1190                                 if (ischunked) {
1191                                         chunksize -= len;
1192                                         if (chunksize <= 0)
1193                                                 break;
1194                                 }
1195                         }
1196                         if (rate_get) {
1197                                 while (1) {
1198                                         (void)gettimeofday(&now, NULL);
1199                                         timersub(&now, &then, &td);
1200                                         if (td.tv_sec > 0)
1201                                                 break;
1202                                         usleep(1000000 - td.tv_usec);
1203                                 }
1204                         }
1205                         if (ischunked && chunksize <= 0)
1206                                 break;
1207                 }
1208                                         /* read CRLF after chunk*/
1209  chunkdone:
1210                 if (ischunked) {
1211                         if (fgets(xferbuf, bufsize, fin) == NULL)
1212                                 break;
1213                         if (strcmp(xferbuf, "\r\n") != 0) {
1214                                 warnx("Unexpected data following chunk");
1215                                 goto cleanup_fetch_url;
1216                         }
1217                 }
1218         } while (ischunked);
1219         if (hash && !progress && bytes > 0) {
1220                 if (bytes < mark)
1221                         (void)putc('#', ttyout);
1222                 (void)putc('\n', ttyout);
1223         }
1224         if (ferror(fin)) {
1225                 warn("Reading file");
1226                 goto cleanup_fetch_url;
1227         }
1228         progressmeter(1);
1229         (void)fflush(fout);
1230         if (closefunc == fclose && mtime != -1) {
1231                 struct timeval tval[2];
1232
1233                 (void)gettimeofday(&tval[0], NULL);
1234                 tval[1].tv_sec = mtime;
1235                 tval[1].tv_usec = 0;
1236                 (*closefunc)(fout);
1237                 fout = NULL;
1238
1239                 if (utimes(savefile, tval) == -1) {
1240                         fprintf(ttyout,
1241                             "Can't change modification time to %s",
1242                             asctime(localtime(&mtime)));
1243                 }
1244         }
1245         if (bytes > 0)
1246                 ptransfer(0);
1247         bytes = 0;
1248
1249         rval = 0;
1250         goto cleanup_fetch_url;
1251
1252  improper:
1253         warnx("Improper response from `%s'", host);
1254
1255  cleanup_fetch_url:
1256         if (oldintr)
1257                 (void)xsignal(SIGINT, oldintr);
1258         if (oldintp)
1259                 (void)xsignal(SIGPIPE, oldintp);
1260         if (fin != NULL)
1261                 fclose(fin);
1262         else if (s != -1)
1263                 close(s);
1264         if (closefunc != NULL && fout != NULL)
1265                 (*closefunc)(fout);
1266         if (res0)
1267                 freeaddrinfo(res0);
1268         FREEPTR(savefile);
1269         FREEPTR(user);
1270         if (pass != NULL)
1271                 memset(pass, 0, strlen(pass));
1272         FREEPTR(pass);
1273         FREEPTR(host);
1274         FREEPTR(port);
1275         FREEPTR(path);
1276         FREEPTR(decodedpath);
1277         FREEPTR(puser);
1278         if (ppass != NULL)
1279                 memset(ppass, 0, strlen(ppass));
1280         FREEPTR(ppass);
1281         FREEPTR(buf);
1282         FREEPTR(auth);
1283         FREEPTR(location);
1284         FREEPTR(message);
1285         return (rval);
1286 }
1287
1288 /*
1289  * Abort a HTTP retrieval
1290  */
1291 void
1292 aborthttp(int notused)
1293 {
1294         char msgbuf[100];
1295         size_t len;
1296
1297         sigint_raised = 1;
1298         alarmtimer(0);
1299         len = strlcpy(msgbuf, "\nHTTP fetch aborted.\n", sizeof(msgbuf));
1300         write(fileno(ttyout), msgbuf, len);
1301         siglongjmp(httpabort, 1);
1302 }
1303
1304 /*
1305  * Retrieve ftp URL or classic ftp argument using FTP.
1306  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1307  * is still open (e.g, ftp xfer with trailing /)
1308  */
1309 static int
1310 fetch_ftp(const char *url)
1311 {
1312         char            *cp, *xargv[5], rempath[MAXPATHLEN];
1313         char            *host, *path, *dir, *file, *user, *pass;
1314         char            *port;
1315         int              dirhasglob, filehasglob, rval, type, xargc;
1316         int              oanonftp, oautologin;
1317         in_port_t        portnum;
1318         url_t            urltype;
1319
1320         host = path = dir = file = user = pass = NULL;
1321         port = NULL;
1322         rval = 1;
1323         type = TYPE_I;
1324
1325         if (STRNEQUAL(url, FTP_URL)) {
1326                 if ((parse_url(url, "URL", &urltype, &user, &pass,
1327                     &host, &port, &portnum, &path) == -1) ||
1328                     (user != NULL && *user == '\0') ||
1329                     EMPTYSTRING(host)) {
1330                         warnx("Invalid URL `%s'", url);
1331                         goto cleanup_fetch_ftp;
1332                 }
1333                 /*
1334                  * Note: Don't url_decode(path) here.  We need to keep the
1335                  * distinction between "/" and "%2F" until later.
1336                  */
1337
1338                                         /* check for trailing ';type=[aid]' */
1339                 if (! EMPTYSTRING(path) && (cp = strrchr(path, ';')) != NULL) {
1340                         if (strcasecmp(cp, ";type=a") == 0)
1341                                 type = TYPE_A;
1342                         else if (strcasecmp(cp, ";type=i") == 0)
1343                                 type = TYPE_I;
1344                         else if (strcasecmp(cp, ";type=d") == 0) {
1345                                 warnx(
1346                             "Directory listing via a URL is not supported");
1347                                 goto cleanup_fetch_ftp;
1348                         } else {
1349                                 warnx("Invalid suffix `%s' in URL `%s'", cp,
1350                                     url);
1351                                 goto cleanup_fetch_ftp;
1352                         }
1353                         *cp = 0;
1354                 }
1355         } else {                        /* classic style `[user@]host:[file]' */
1356                 urltype = CLASSIC_URL_T;
1357                 host = xstrdup(url);
1358                 cp = strchr(host, '@');
1359                 if (cp != NULL) {
1360                         *cp = '\0';
1361                         user = host;
1362                         anonftp = 0;    /* disable anonftp */
1363                         host = xstrdup(cp + 1);
1364                 }
1365                 cp = strchr(host, ':');
1366                 if (cp != NULL) {
1367                         *cp = '\0';
1368                         path = xstrdup(cp + 1);
1369                 }
1370         }
1371         if (EMPTYSTRING(host))
1372                 goto cleanup_fetch_ftp;
1373
1374                         /* Extract the file and (if present) directory name. */
1375         dir = path;
1376         if (! EMPTYSTRING(dir)) {
1377                 /*
1378                  * If we are dealing with classic `[user@]host:[path]' syntax,
1379                  * then a path of the form `/file' (resulting from input of the
1380                  * form `host:/file') means that we should do "CWD /" before
1381                  * retrieving the file.  So we set dir="/" and file="file".
1382                  *
1383                  * But if we are dealing with URLs like `ftp://host/path' then
1384                  * a path of the form `/file' (resulting from a URL of the form
1385                  * `ftp://host//file') means that we should do `CWD ' (with an
1386                  * empty argument) before retrieving the file.  So we set
1387                  * dir="" and file="file".
1388                  *
1389                  * If the path does not contain / at all, we set dir=NULL.
1390                  * (We get a path without any slashes if we are dealing with
1391                  * classic `[user@]host:[file]' or URL `ftp://host/file'.)
1392                  *
1393                  * In all other cases, we set dir to a string that does not
1394                  * include the final '/' that separates the dir part from the
1395                  * file part of the path.  (This will be the empty string if
1396                  * and only if we are dealing with a path of the form `/file'
1397                  * resulting from an URL of the form `ftp://host//file'.)
1398                  */
1399                 cp = strrchr(dir, '/');
1400                 if (cp == dir && urltype == CLASSIC_URL_T) {
1401                         file = cp + 1;
1402                         dir = "/";
1403                 } else if (cp != NULL) {
1404                         *cp++ = '\0';
1405                         file = cp;
1406                 } else {
1407                         file = dir;
1408                         dir = NULL;
1409                 }
1410         } else
1411                 dir = NULL;
1412         if (urltype == FTP_URL_T && file != NULL) {
1413                 url_decode(file);
1414                 /* but still don't url_decode(dir) */
1415         }
1416         DPRINTF("fetch_ftp: user `%s' pass `%s' host %s port %s "
1417             "path `%s' dir `%s' file `%s'\n",
1418             user ? user : "<null>", pass ? pass : "<null>",
1419             host ? host : "<null>", port ? port : "<null>",
1420             path ? path : "<null>",
1421             dir ? dir : "<null>", file ? file : "<null>");
1422
1423         dirhasglob = filehasglob = 0;
1424         if (doglob && urltype == CLASSIC_URL_T) {
1425                 if (! EMPTYSTRING(dir) && strpbrk(dir, "*?[]{}") != NULL)
1426                         dirhasglob = 1;
1427                 if (! EMPTYSTRING(file) && strpbrk(file, "*?[]{}") != NULL)
1428                         filehasglob = 1;
1429         }
1430
1431                         /* Set up the connection */
1432         oanonftp = anonftp;
1433         if (connected)
1434                 disconnect(0, NULL);
1435         anonftp = oanonftp;
1436         xargv[0] = (char *)getprogname();       /* XXX discards const */
1437         xargv[1] = host;
1438         xargv[2] = NULL;
1439         xargc = 2;
1440         if (port) {
1441                 xargv[2] = port;
1442                 xargv[3] = NULL;
1443                 xargc = 3;
1444         }
1445         oautologin = autologin;
1446                 /* don't autologin in setpeer(), use ftp_login() below */
1447         autologin = 0;
1448         setpeer(xargc, xargv);
1449         autologin = oautologin;
1450         if ((connected == 0) ||
1451             (connected == 1 && !ftp_login(host, user, pass))) {
1452                 warnx("Can't connect or login to host `%s'", host);
1453                 goto cleanup_fetch_ftp;
1454         }
1455
1456         switch (type) {
1457         case TYPE_A:
1458                 setascii(1, xargv);
1459                 break;
1460         case TYPE_I:
1461                 setbinary(1, xargv);
1462                 break;
1463         default:
1464                 errx(1, "fetch_ftp: unknown transfer type %d", type);
1465         }
1466
1467                 /*
1468                  * Change directories, if necessary.
1469                  *
1470                  * Note: don't use EMPTYSTRING(dir) below, because
1471                  * dir=="" means something different from dir==NULL.
1472                  */
1473         if (dir != NULL && !dirhasglob) {
1474                 char *nextpart;
1475
1476                 /*
1477                  * If we are dealing with a classic `[user@]host:[path]'
1478                  * (urltype is CLASSIC_URL_T) then we have a raw directory
1479                  * name (not encoded in any way) and we can change
1480                  * directories in one step.
1481                  *
1482                  * If we are dealing with an `ftp://host/path' URL
1483                  * (urltype is FTP_URL_T), then RFC 1738 says we need to
1484                  * send a separate CWD command for each unescaped "/"
1485                  * in the path, and we have to interpret %hex escaping
1486                  * *after* we find the slashes.  It's possible to get
1487                  * empty components here, (from multiple adjacent
1488                  * slashes in the path) and RFC 1738 says that we should
1489                  * still do `CWD ' (with a null argument) in such cases.
1490                  *
1491                  * Many ftp servers don't support `CWD ', so if there's an
1492                  * error performing that command, bail out with a descriptive
1493                  * message.
1494                  *
1495                  * Examples:
1496                  *
1497                  * host:                        dir="", urltype=CLASSIC_URL_T
1498                  *              logged in (to default directory)
1499                  * host:file                    dir=NULL, urltype=CLASSIC_URL_T
1500                  *              "RETR file"
1501                  * host:dir/                    dir="dir", urltype=CLASSIC_URL_T
1502                  *              "CWD dir", logged in
1503                  * ftp://host/                  dir="", urltype=FTP_URL_T
1504                  *              logged in (to default directory)
1505                  * ftp://host/dir/              dir="dir", urltype=FTP_URL_T
1506                  *              "CWD dir", logged in
1507                  * ftp://host/file              dir=NULL, urltype=FTP_URL_T
1508                  *              "RETR file"
1509                  * ftp://host//file             dir="", urltype=FTP_URL_T
1510                  *              "CWD ", "RETR file"
1511                  * host:/file                   dir="/", urltype=CLASSIC_URL_T
1512                  *              "CWD /", "RETR file"
1513                  * ftp://host///file            dir="/", urltype=FTP_URL_T
1514                  *              "CWD ", "CWD ", "RETR file"
1515                  * ftp://host/%2F/file          dir="%2F", urltype=FTP_URL_T
1516                  *              "CWD /", "RETR file"
1517                  * ftp://host/foo/file          dir="foo", urltype=FTP_URL_T
1518                  *              "CWD foo", "RETR file"
1519                  * ftp://host/foo/bar/file      dir="foo/bar"
1520                  *              "CWD foo", "CWD bar", "RETR file"
1521                  * ftp://host//foo/bar/file     dir="/foo/bar"
1522                  *              "CWD ", "CWD foo", "CWD bar", "RETR file"
1523                  * ftp://host/foo//bar/file     dir="foo//bar"
1524                  *              "CWD foo", "CWD ", "CWD bar", "RETR file"
1525                  * ftp://host/%2F/foo/bar/file  dir="%2F/foo/bar"
1526                  *              "CWD /", "CWD foo", "CWD bar", "RETR file"
1527                  * ftp://host/%2Ffoo/bar/file   dir="%2Ffoo/bar"
1528                  *              "CWD /foo", "CWD bar", "RETR file"
1529                  * ftp://host/%2Ffoo%2Fbar/file dir="%2Ffoo%2Fbar"
1530                  *              "CWD /foo/bar", "RETR file"
1531                  * ftp://host/%2Ffoo%2Fbar%2Ffile       dir=NULL
1532                  *              "RETR /foo/bar/file"
1533                  *
1534                  * Note that we don't need `dir' after this point.
1535                  */
1536                 do {
1537                         if (urltype == FTP_URL_T) {
1538                                 nextpart = strchr(dir, '/');
1539                                 if (nextpart) {
1540                                         *nextpart = '\0';
1541                                         nextpart++;
1542                                 }
1543                                 url_decode(dir);
1544                         } else
1545                                 nextpart = NULL;
1546                         DPRINTF("dir `%s', nextpart `%s'\n",
1547                             dir ? dir : "<null>",
1548                             nextpart ? nextpart : "<null>");
1549                         if (urltype == FTP_URL_T || *dir != '\0') {
1550                                 xargv[0] = "cd";
1551                                 xargv[1] = dir;
1552                                 xargv[2] = NULL;
1553                                 dirchange = 0;
1554                                 cd(2, xargv);
1555                                 if (! dirchange) {
1556                                         if (*dir == '\0' && code == 500)
1557                                                 fprintf(stderr,
1558 "\n"
1559 "ftp: The `CWD ' command (without a directory), which is required by\n"
1560 "     RFC 1738 to support the empty directory in the URL pathname (`//'),\n"
1561 "     conflicts with the server's conformance to RFC 959.\n"
1562 "     Try the same URL without the `//' in the URL pathname.\n"
1563 "\n");
1564                                         goto cleanup_fetch_ftp;
1565                                 }
1566                         }
1567                         dir = nextpart;
1568                 } while (dir != NULL);
1569         }
1570
1571         if (EMPTYSTRING(file)) {
1572                 rval = -1;
1573                 goto cleanup_fetch_ftp;
1574         }
1575
1576         if (dirhasglob) {
1577                 (void)strlcpy(rempath, dir,     sizeof(rempath));
1578                 (void)strlcat(rempath, "/",     sizeof(rempath));
1579                 (void)strlcat(rempath, file,    sizeof(rempath));
1580                 file = rempath;
1581         }
1582
1583                         /* Fetch the file(s). */
1584         xargc = 2;
1585         xargv[0] = "get";
1586         xargv[1] = file;
1587         xargv[2] = NULL;
1588         if (dirhasglob || filehasglob) {
1589                 int ointeractive;
1590
1591                 ointeractive = interactive;
1592                 interactive = 0;
1593                 if (restartautofetch)
1594                         xargv[0] = "mreget";
1595                 else
1596                         xargv[0] = "mget";
1597                 mget(xargc, xargv);
1598                 interactive = ointeractive;
1599         } else {
1600                 if (outfile == NULL) {
1601                         cp = strrchr(file, '/');        /* find savefile */
1602                         if (cp != NULL)
1603                                 outfile = cp + 1;
1604                         else
1605                                 outfile = file;
1606                 }
1607                 xargv[2] = (char *)outfile;
1608                 xargv[3] = NULL;
1609                 xargc++;
1610                 if (restartautofetch)
1611                         reget(xargc, xargv);
1612                 else
1613                         get(xargc, xargv);
1614         }
1615
1616         if ((code / 100) == COMPLETE)
1617                 rval = 0;
1618
1619  cleanup_fetch_ftp:
1620         FREEPTR(host);
1621         FREEPTR(path);
1622         FREEPTR(user);
1623         if (pass)
1624                 memset(pass, 0, strlen(pass));
1625         FREEPTR(pass);
1626         return (rval);
1627 }
1628
1629 /*
1630  * Retrieve the given file to outfile.
1631  * Supports arguments of the form:
1632  *      "host:path", "ftp://host/path"  if $ftpproxy, call fetch_url() else
1633  *                                      call fetch_ftp()
1634  *      "http://host/path"              call fetch_url() to use HTTP
1635  *      "file:///path"                  call fetch_url() to copy
1636  *      "about:..."                     print a message
1637  *
1638  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1639  * is still open (e.g, ftp xfer with trailing /)
1640  */
1641 static int
1642 go_fetch(const char *url)
1643 {
1644         char *proxy;
1645
1646 #ifndef NO_ABOUT
1647         /*
1648          * Check for about:*
1649          */
1650         if (STRNEQUAL(url, ABOUT_URL)) {
1651                 url += sizeof(ABOUT_URL) -1;
1652                 if (strcasecmp(url, "ftp") == 0 ||
1653                     strcasecmp(url, "tnftp") == 0) {
1654                         fputs(
1655 "This version of ftp has been enhanced by Luke Mewburn <lukem@NetBSD.org>\n"
1656 "for the NetBSD project.  Execute `man ftp' for more details.\n", ttyout);
1657                 } else if (strcasecmp(url, "lukem") == 0) {
1658                         fputs(
1659 "Luke Mewburn is the author of most of the enhancements in this ftp client.\n"
1660 "Please email feedback to <lukem@NetBSD.org>.\n", ttyout);
1661                 } else if (strcasecmp(url, "netbsd") == 0) {
1662                         fputs(
1663 "NetBSD is a freely available and redistributable UNIX-like operating system.\n"
1664 "For more information, see http://www.NetBSD.org/\n", ttyout);
1665                 } else if (strcasecmp(url, "version") == 0) {
1666                         fprintf(ttyout, "Version: %s %s%s\n",
1667                             FTP_PRODUCT, FTP_VERSION,
1668 #ifdef INET6
1669                             ""
1670 #else
1671                             " (-IPv6)"
1672 #endif
1673                         );
1674                 } else {
1675                         fprintf(ttyout, "`%s' is an interesting topic.\n", url);
1676                 }
1677                 fputs("\n", ttyout);
1678                 return (0);
1679         }
1680 #endif
1681
1682         /*
1683          * Check for file:// and http:// URLs.
1684          */
1685         if (STRNEQUAL(url, HTTP_URL) || STRNEQUAL(url, FILE_URL))
1686                 return (fetch_url(url, NULL, NULL, NULL));
1687
1688         /*
1689          * Try FTP URL-style and host:file arguments next.
1690          * If ftpproxy is set with an FTP URL, use fetch_url()
1691          * Othewise, use fetch_ftp().
1692          */
1693         proxy = getoptionvalue("ftp_proxy");
1694         if (!EMPTYSTRING(proxy) && STRNEQUAL(url, FTP_URL))
1695                 return (fetch_url(url, NULL, NULL, NULL));
1696
1697         return (fetch_ftp(url));
1698 }
1699
1700 /*
1701  * Retrieve multiple files from the command line,
1702  * calling go_fetch() for each file.
1703  *
1704  * If an ftp path has a trailing "/", the path will be cd-ed into and
1705  * the connection remains open, and the function will return -1
1706  * (to indicate the connection is alive).
1707  * If an error occurs the return value will be the offset+1 in
1708  * argv[] of the file that caused a problem (i.e, argv[x]
1709  * returns x+1)
1710  * Otherwise, 0 is returned if all files retrieved successfully.
1711  */
1712 int
1713 auto_fetch(int argc, char *argv[])
1714 {
1715         volatile int    argpos, rval;
1716
1717         argpos = rval = 0;
1718
1719         if (sigsetjmp(toplevel, 1)) {
1720                 if (connected)
1721                         disconnect(0, NULL);
1722                 if (rval > 0)
1723                         rval = argpos + 1;
1724                 return (rval);
1725         }
1726         (void)xsignal(SIGINT, intr);
1727         (void)xsignal(SIGPIPE, lostpeer);
1728
1729         /*
1730          * Loop through as long as there's files to fetch.
1731          */
1732         for (; (rval == 0) && (argpos < argc); argpos++) {
1733                 if (strchr(argv[argpos], ':') == NULL)
1734                         break;
1735                 redirect_loop = 0;
1736                 if (!anonftp)
1737                         anonftp = 2;    /* Handle "automatic" transfers. */
1738                 rval = go_fetch(argv[argpos]);
1739                 if (outfile != NULL && strcmp(outfile, "-") != 0
1740                     && outfile[0] != '|')
1741                         outfile = NULL;
1742                 if (rval > 0)
1743                         rval = argpos + 1;
1744         }
1745
1746         if (connected && rval != -1)
1747                 disconnect(0, NULL);
1748         return (rval);
1749 }
1750
1751
1752 int
1753 auto_put(int argc, char **argv, const char *uploadserver)
1754 {
1755         char    *uargv[4], *path, *pathsep;
1756         int      uargc, rval;
1757         size_t   len;
1758
1759         uargc = 0;
1760         uargv[uargc++] = "mput";
1761         uargv[uargc++] = argv[0];
1762         uargv[2] = uargv[3] = NULL;
1763         pathsep = NULL;
1764         rval = 1;
1765
1766         DPRINTF("auto_put: target `%s'\n", uploadserver);
1767
1768         path = xstrdup(uploadserver);
1769         len = strlen(path);
1770         if (path[len - 1] != '/' && path[len - 1] != ':') {
1771                         /*
1772                          * make sure we always pass a directory to auto_fetch
1773                          */
1774                 if (argc > 1) {         /* more than one file to upload */
1775                         len = strlen(uploadserver) + 2; /* path + "/" + "\0" */
1776                         free(path);
1777                         path = (char *)xmalloc(len);
1778                         (void)strlcpy(path, uploadserver, len);
1779                         (void)strlcat(path, "/", len);
1780                 } else {                /* single file to upload */
1781                         uargv[0] = "put";
1782                         pathsep = strrchr(path, '/');
1783                         if (pathsep == NULL) {
1784                                 pathsep = strrchr(path, ':');
1785                                 if (pathsep == NULL) {
1786                                         warnx("Invalid URL `%s'", path);
1787                                         goto cleanup_auto_put;
1788                                 }
1789                                 pathsep++;
1790                                 uargv[2] = xstrdup(pathsep);
1791                                 pathsep[0] = '/';
1792                         } else
1793                                 uargv[2] = xstrdup(pathsep + 1);
1794                         pathsep[1] = '\0';
1795                         uargc++;
1796                 }
1797         }
1798         DPRINTF("auto_put: URL `%s' argv[2] `%s'\n",
1799             path, uargv[2] ? uargv[2] : "<null>");
1800
1801                         /* connect and cwd */
1802         rval = auto_fetch(1, &path);
1803         free(path);
1804         if(rval >= 0)
1805                 goto cleanup_auto_put;
1806
1807                         /* XXX : is this the best way? */
1808         if (uargc == 3) {
1809                 uargv[1] = argv[0];
1810                 put(uargc, uargv);
1811                 goto cleanup_auto_put;
1812         }
1813
1814         for(; argv[0] != NULL; argv++) {
1815                 uargv[1] = argv[0];
1816                 mput(uargc, uargv);
1817         }
1818         rval = 0;
1819
1820  cleanup_auto_put:
1821         FREEPTR(uargv[2]);
1822         return (rval);
1823 }