contrib/tnftp/fetch.c

   1 /*      $NetBSD: fetch.c,v 1.175 2007/04/17 05:52:03 lukem Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1997-2007 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Luke Mewburn.
   9  *
  10  * This code is derived from software contributed to The NetBSD Foundation
  11  * by Scott Aaron Bamford.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the NetBSD
  24  *      Foundation, Inc. and its contributors.
  25  * 4. Neither the name of The NetBSD Foundation nor the names of its
  26  *    contributors may be used to endorse or promote products derived
  27  *    from this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  30  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  31  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  32  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  33  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  34  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  35  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  36  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  37  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  39  * POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 #include <sys/cdefs.h>
  43 #ifndef lint
  44 __RCSID("$NetBSD: fetch.c,v 1.175 2007/04/17 05:52:03 lukem Exp $");
  45 #endif /* not lint */
  46
  47 /*
  48  * FTP User Program -- Command line file retrieval
  49  */
  50
  51 #include <sys/types.h>
  52 #include <sys/param.h>
  53 #include <sys/socket.h>
  54 #include <sys/stat.h>
  55 #include <sys/time.h>
  56
  57 #include <netinet/in.h>
  58
  59 #include <arpa/ftp.h>
  60 #include <arpa/inet.h>
  61
  62 #include <ctype.h>
  63 #include <err.h>
  64 #include <errno.h>
  65 #include <netdb.h>
  66 #include <fcntl.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71 #include <time.h>
  72
  73 #include "ftp_var.h"
  74 #include "version.h"
  75
  76 typedef enum {
  77         UNKNOWN_URL_T=-1,
  78         HTTP_URL_T,
  79         FTP_URL_T,
  80         FILE_URL_T,
  81         CLASSIC_URL_T
  82 } url_t;
  83
  84 void            aborthttp(int);
  85 #ifndef NO_AUTH
  86 static int      auth_url(const char *, char **, const char *, const char *);
  87 static void     base64_encode(const unsigned char *, size_t, unsigned char *);
  88 #endif
  89 static int      go_fetch(const char *);
  90 static int      fetch_ftp(const char *);
  91 static int      fetch_url(const char *, const char *, char *, char *);
  92 static const char *match_token(const char **, const char *);
  93 static int      parse_url(const char *, const char *, url_t *, char **,
  94                             char **, char **, char **, in_port_t *, char **);
  95 static void     url_decode(char *);
  96
  97 static int      redirect_loop;
  98
  99
 100 #define STRNEQUAL(a,b)  (strncasecmp((a), (b), sizeof((b))-1) == 0)
 101 #define ISLWS(x)        ((x)=='\r' || (x)=='\n' || (x)==' ' || (x)=='\t')
 102 #define SKIPLWS(x)      do { while (ISLWS((*x))) x++; } while (0)
 103
 104
 105 #define ABOUT_URL       "about:"        /* propaganda */
 106 #define FILE_URL        "file://"       /* file URL prefix */
 107 #define FTP_URL         "ftp://"        /* ftp URL prefix */
 108 #define HTTP_URL        "http://"       /* http URL prefix */
 109
 110
 111 /*
 112  * Determine if token is the next word in buf (case insensitive).
 113  * If so, advance buf past the token and any trailing LWS, and
 114  * return a pointer to the token (in buf).  Otherwise, return NULL.
 115  * token may be preceded by LWS.
 116  * token must be followed by LWS or NUL.  (I.e, don't partial match).
 117  */
 118 static const char *
 119 match_token(const char **buf, const char *token)
 120 {
 121         const char      *p, *orig;
 122         size_t          tlen;
 123
 124         tlen = strlen(token);
 125         p = *buf;
 126         SKIPLWS(p);
 127         orig = p;
 128         if (strncasecmp(p, token, tlen) != 0)
 129                 return NULL;
 130         p += tlen;
 131         if (*p != '\0' && !ISLWS(*p))
 132                 return NULL;
 133         SKIPLWS(p);
 134         orig = *buf;
 135         *buf = p;
 136         return orig;
 137 }
 138
 139 #ifndef NO_AUTH
 140 /*
 141  * Generate authorization response based on given authentication challenge.
 142  * Returns -1 if an error occurred, otherwise 0.
 143  * Sets response to a malloc(3)ed string; caller should free.
 144  */
 145 static int
 146 auth_url(const char *challenge, char **response, const char *guser,
 147         const char *gpass)
 148 {
 149         const char      *cp, *scheme, *errormsg;
 150         char            *ep, *clear, *realm;
 151         char             user[BUFSIZ], *pass;
 152         int              rval;
 153         size_t           len, clen, rlen;
 154
 155         *response = NULL;
 156         clear = realm = NULL;
 157         rval = -1;
 158         cp = challenge;
 159         scheme = "Basic";       /* only support Basic authentication */
 160
 161         DPRINTF("auth_url: challenge `%s'\n", challenge);
 162
 163         if (! match_token(&cp, scheme)) {
 164                 warnx("Unsupported authentication challenge `%s'",
 165                     challenge);
 166                 goto cleanup_auth_url;
 167         }
 168
 169 #define REALM "realm=\""
 170         if (STRNEQUAL(cp, REALM))
 171                 cp += sizeof(REALM) - 1;
 172         else {
 173                 warnx("Unsupported authentication challenge `%s'",
 174                     challenge);
 175                 goto cleanup_auth_url;
 176         }
 177 /* XXX: need to improve quoted-string parsing to support \ quoting, etc. */
 178         if ((ep = strchr(cp, '\"')) != NULL) {
 179                 size_t len = ep - cp;
 180
 181                 realm = (char *)ftp_malloc(len + 1);
 182                 (void)strlcpy(realm, cp, len + 1);
 183         } else {
 184                 warnx("Unsupported authentication challenge `%s'",
 185                     challenge);
 186                 goto cleanup_auth_url;
 187         }
 188
 189         fprintf(ttyout, "Username for `%s': ", realm);
 190         if (guser != NULL) {
 191                 (void)strlcpy(user, guser, sizeof(user));
 192                 fprintf(ttyout, "%s\n", user);
 193         } else {
 194                 (void)fflush(ttyout);
 195                 if (getline(stdin, user, sizeof(user), &errormsg) < 0) {
 196                         warnx("%s; can't authenticate", errormsg);
 197                         goto cleanup_auth_url;
 198                 }
 199         }
 200         if (gpass != NULL)
 201                 pass = (char *)gpass;
 202         else {
 203                 pass = getpass("Password: ");
 204                 if (pass == NULL) {
 205                         warnx("Can't read password");
 206                         goto cleanup_auth_url;
 207                 }
 208         }
 209
 210         clen = strlen(user) + strlen(pass) + 2; /* user + ":" + pass + "\0" */
 211         clear = (char *)ftp_malloc(clen);
 212         (void)strlcpy(clear, user, clen);
 213         (void)strlcat(clear, ":", clen);
 214         (void)strlcat(clear, pass, clen);
 215         if (gpass == NULL)
 216                 memset(pass, 0, strlen(pass));
 217
 218                                                 /* scheme + " " + enc + "\0" */
 219         rlen = strlen(scheme) + 1 + (clen + 2) * 4 / 3 + 1;
 220         *response = (char *)ftp_malloc(rlen);
 221         (void)strlcpy(*response, scheme, rlen);
 222         len = strlcat(*response, " ", rlen);
 223                         /* use  `clen - 1'  to not encode the trailing NUL */
 224         base64_encode((unsigned char *)clear, clen - 1,
 225             (unsigned char *)*response + len);
 226         memset(clear, 0, clen);
 227         rval = 0;
 228
 229  cleanup_auth_url:
 230         FREEPTR(clear);
 231         FREEPTR(realm);
 232         return (rval);
 233 }
 234
 235 /*
 236  * Encode len bytes starting at clear using base64 encoding into encoded,
 237  * which should be at least ((len + 2) * 4 / 3 + 1) in size.
 238  */
 239 static void
 240 base64_encode(const unsigned char *clear, size_t len, unsigned char *encoded)
 241 {
 242         static const unsigned char enc[] =
 243             "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 244         unsigned char   *cp;
 245         int      i;
 246
 247         cp = encoded;
 248         for (i = 0; i < len; i += 3) {
 249                 *(cp++) = enc[((clear[i + 0] >> 2))];
 250                 *(cp++) = enc[((clear[i + 0] << 4) & 0x30)
 251                             | ((clear[i + 1] >> 4) & 0x0f)];
 252                 *(cp++) = enc[((clear[i + 1] << 2) & 0x3c)
 253                             | ((clear[i + 2] >> 6) & 0x03)];
 254                 *(cp++) = enc[((clear[i + 2]     ) & 0x3f)];
 255         }
 256         *cp = '\0';
 257         while (i-- > len)
 258                 *(--cp) = '=';
 259 }
 260 #endif
 261
 262 /*
 263  * Decode %xx escapes in given string, `in-place'.
 264  */
 265 static void
 266 url_decode(char *url)
 267 {
 268         unsigned char *p, *q;
 269
 270         if (EMPTYSTRING(url))
 271                 return;
 272         p = q = (unsigned char *)url;
 273
 274 #define HEXTOINT(x) (x - (isdigit(x) ? '0' : (islower(x) ? 'a' : 'A') - 10))
 275         while (*p) {
 276                 if (p[0] == '%'
 277                     && p[1] && isxdigit((unsigned char)p[1])
 278                     && p[2] && isxdigit((unsigned char)p[2])) {
 279                         *q++ = HEXTOINT(p[1]) * 16 + HEXTOINT(p[2]);
 280                         p+=3;
 281                 } else
 282                         *q++ = *p++;
 283         }
 284         *q = '\0';
 285 }
 286
 287
 288 /*
 289  * Parse URL of form:
 290  *      <type>://[<user>[:<password>]@]<host>[:<port>][/<path>]
 291  * Returns -1 if a parse error occurred, otherwise 0.
 292  * It's the caller's responsibility to url_decode() the returned
 293  * user, pass and path.
 294  *
 295  * Sets type to url_t, each of the given char ** pointers to a
 296  * malloc(3)ed strings of the relevant section, and port to
 297  * the number given, or ftpport if ftp://, or httpport if http://.
 298  *
 299  * If <host> is surrounded by `[' and ']', it's parsed as an
 300  * IPv6 address (as per RFC 2732).
 301  *
 302  * XXX: this is not totally RFC 1738 compliant; <path> will have the
 303  * leading `/' unless it's an ftp:// URL, as this makes things easier
 304  * for file:// and http:// URLs. ftp:// URLs have the `/' between the
 305  * host and the URL-path removed, but any additional leading slashes
 306  * in the URL-path are retained (because they imply that we should
 307  * later do "CWD" with a null argument).
 308  *
 309  * Examples:
 310  *       input URL                       output path
 311  *       ---------                       -----------
 312  *      "ftp://host"                    NULL
 313  *      "http://host/"                  NULL
 314  *      "file://host/dir/file"          "dir/file"
 315  *      "ftp://host/"                   ""
 316  *      "ftp://host//"                  NULL
 317  *      "ftp://host//dir/file"          "/dir/file"
 318  */
 319 static int
 320 parse_url(const char *url, const char *desc, url_t *type,
 321                 char **user, char **pass, char **host, char **port,
 322                 in_port_t *portnum, char **path)
 323 {
 324         const char      *origurl;
 325         char            *cp, *ep, *thost, *tport;
 326         size_t           len;
 327
 328         if (url == NULL || desc == NULL || type == NULL || user == NULL
 329             || pass == NULL || host == NULL || port == NULL || portnum == NULL
 330             || path == NULL)
 331                 errx(1, "parse_url: invoked with NULL argument!");
 332
 333         origurl = url;
 334         *type = UNKNOWN_URL_T;
 335         *user = *pass = *host = *port = *path = NULL;
 336         *portnum = 0;
 337         tport = NULL;
 338
 339         if (STRNEQUAL(url, HTTP_URL)) {
 340                 url += sizeof(HTTP_URL) - 1;
 341                 *type = HTTP_URL_T;
 342                 *portnum = HTTP_PORT;
 343                 tport = httpport;
 344         } else if (STRNEQUAL(url, FTP_URL)) {
 345                 url += sizeof(FTP_URL) - 1;
 346                 *type = FTP_URL_T;
 347                 *portnum = FTP_PORT;
 348                 tport = ftpport;
 349         } else if (STRNEQUAL(url, FILE_URL)) {
 350                 url += sizeof(FILE_URL) - 1;
 351                 *type = FILE_URL_T;
 352         } else {
 353                 warnx("Invalid %s `%s'", desc, url);
 354  cleanup_parse_url:
 355                 FREEPTR(*user);
 356                 if (*pass != NULL)
 357                         memset(*pass, 0, strlen(*pass));
 358                 FREEPTR(*pass);
 359                 FREEPTR(*host);
 360                 FREEPTR(*port);
 361                 FREEPTR(*path);
 362                 return (-1);
 363         }
 364
 365         if (*url == '\0')
 366                 return (0);
 367
 368                         /* find [user[:pass]@]host[:port] */
 369         ep = strchr(url, '/');
 370         if (ep == NULL)
 371                 thost = ftp_strdup(url);
 372         else {
 373                 len = ep - url;
 374                 thost = (char *)ftp_malloc(len + 1);
 375                 (void)strlcpy(thost, url, len + 1);
 376                 if (*type == FTP_URL_T) /* skip first / for ftp URLs */
 377                         ep++;
 378                 *path = ftp_strdup(ep);
 379         }
 380
 381         cp = strchr(thost, '@');        /* look for user[:pass]@ in URLs */
 382         if (cp != NULL) {
 383                 if (*type == FTP_URL_T)
 384                         anonftp = 0;    /* disable anonftp */
 385                 *user = thost;
 386                 *cp = '\0';
 387                 thost = ftp_strdup(cp + 1);
 388                 cp = strchr(*user, ':');
 389                 if (cp != NULL) {
 390                         *cp = '\0';
 391                         *pass = ftp_strdup(cp + 1);
 392                 }
 393                 url_decode(*user);
 394                 if (*pass)
 395                         url_decode(*pass);
 396         }
 397
 398 #ifdef INET6
 399                         /*
 400                          * Check if thost is an encoded IPv6 address, as per
 401                          * RFC 2732:
 402                          *      `[' ipv6-address ']'
 403                          */
 404         if (*thost == '[') {
 405                 cp = thost + 1;
 406                 if ((ep = strchr(cp, ']')) == NULL ||
 407                     (ep[1] != '\0' && ep[1] != ':')) {
 408                         warnx("Invalid address `%s' in %s `%s'",
 409                             thost, desc, origurl);
 410                         goto cleanup_parse_url;
 411                 }
 412                 len = ep - cp;          /* change `[xyz]' -> `xyz' */
 413                 memmove(thost, thost + 1, len);
 414                 thost[len] = '\0';
 415                 if (! isipv6addr(thost)) {
 416                         warnx("Invalid IPv6 address `%s' in %s `%s'",
 417                             thost, desc, origurl);
 418                         goto cleanup_parse_url;
 419                 }
 420                 cp = ep + 1;
 421                 if (*cp == ':')
 422                         cp++;
 423                 else
 424                         cp = NULL;
 425         } else
 426 #endif /* INET6 */
 427             if ((cp = strchr(thost, ':')) != NULL)
 428                 *cp++ =  '\0';
 429         *host = thost;
 430
 431                         /* look for [:port] */
 432         if (cp != NULL) {
 433                 long    nport;
 434
 435                 nport = parseport(cp, -1);
 436                 if (nport == -1) {
 437                         warnx("Unknown port `%s' in %s `%s'",
 438                             cp, desc, origurl);
 439                         goto cleanup_parse_url;
 440                 }
 441                 *portnum = nport;
 442                 tport = cp;
 443         }
 444
 445         if (tport != NULL)
 446                 *port = ftp_strdup(tport);
 447         if (*path == NULL)
 448                 *path = ftp_strdup("/");
 449
 450         DPRINTF("parse_url: user `%s' pass `%s' host %s port %s(%d) "
 451             "path `%s'\n",
 452             *user ? *user : "<null>", *pass ? *pass : "<null>",
 453             *host ? *host : "<null>", *port ? *port : "<null>",
 454             *portnum ? *portnum : -1, *path ? *path : "<null>");
 455
 456         return (0);
 457 }
 458
 459 sigjmp_buf      httpabort;
 460
 461 /*
 462  * Retrieve URL, via a proxy if necessary, using HTTP.
 463  * If proxyenv is set, use that for the proxy, otherwise try ftp_proxy or
 464  * http_proxy as appropriate.
 465  * Supports HTTP redirects.
 466  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
 467  * is still open (e.g, ftp xfer with trailing /)
 468  */
 469 static int
 470 fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth)
 471 {
 472         struct addrinfo         hints, *res, *res0 = NULL;
 473         int                     error;
 474         char                    hbuf[NI_MAXHOST];
 475         sigfunc volatile        oldintr;
 476         sigfunc volatile        oldintp;
 477         int volatile            s;
 478         struct stat             sb;
 479         int volatile            ischunked;
 480         int volatile            isproxy;
 481         int volatile            rval;
 482         int volatile            hcode;
 483         size_t                  len;
 484         static size_t           bufsize;
 485         static char             *xferbuf;
 486         const char              *cp, *token;
 487         char                    *ep;
 488         char                    *volatile buf;
 489         char                    *volatile savefile;
 490         char                    *volatile auth;
 491         char                    *volatile location;
 492         char                    *volatile message;
 493         char                    *user, *pass, *host, *port, *path;
 494         char                    *volatile decodedpath;
 495         char                    *puser, *ppass, *useragent;
 496         off_t                   hashbytes, rangestart, rangeend, entitylen;
 497         int                     (*volatile closefunc)(FILE *);
 498         FILE                    *volatile fin;
 499         FILE                    *volatile fout;
 500         time_t                  mtime;
 501         url_t                   urltype;
 502         in_port_t               portnum;
 503
 504         oldintr = oldintp = NULL;
 505         closefunc = NULL;
 506         fin = fout = NULL;
 507         s = -1;
 508         buf = savefile = NULL;
 509         auth = location = message = NULL;
 510         ischunked = isproxy = hcode = 0;
 511         rval = 1;
 512         user = pass = host = path = decodedpath = puser = ppass = NULL;
 513
 514         if (parse_url(url, "URL", &urltype, &user, &pass, &host, &port,
 515             &portnum, &path) == -1)
 516                 goto cleanup_fetch_url;
 517
 518         if (urltype == FILE_URL_T && ! EMPTYSTRING(host)
 519             && strcasecmp(host, "localhost") != 0) {
 520                 warnx("No support for non local file URL `%s'", url);
 521                 goto cleanup_fetch_url;
 522         }
 523
 524         if (EMPTYSTRING(path)) {
 525                 if (urltype == FTP_URL_T) {
 526                         rval = fetch_ftp(url);
 527                         goto cleanup_fetch_url;
 528                 }
 529                 if (urltype != HTTP_URL_T || outfile == NULL)  {
 530                         warnx("Invalid URL (no file after host) `%s'", url);
 531                         goto cleanup_fetch_url;
 532                 }
 533         }
 534
 535         decodedpath = ftp_strdup(path);
 536         url_decode(decodedpath);
 537
 538         if (outfile)
 539                 savefile = ftp_strdup(outfile);
 540         else {
 541                 cp = strrchr(decodedpath, '/');         /* find savefile */
 542                 if (cp != NULL)
 543                         savefile = ftp_strdup(cp + 1);
 544                 else
 545                         savefile = ftp_strdup(decodedpath);
 546         }
 547         if (EMPTYSTRING(savefile)) {
 548                 if (urltype == FTP_URL_T) {
 549                         rval = fetch_ftp(url);
 550                         goto cleanup_fetch_url;
 551                 }
 552                 warnx("No file after directory (you must specify an "
 553                     "output file) `%s'", url);
 554                 goto cleanup_fetch_url;
 555         } else {
 556                 DPRINTF("savefile `%s'\n", savefile);
 557         }
 558
 559         restart_point = 0;
 560         filesize = -1;
 561         rangestart = rangeend = entitylen = -1;
 562         mtime = -1;
 563         if (restartautofetch) {
 564                 if (strcmp(savefile, "-") != 0 && *savefile != '|' &&
 565                     stat(savefile, &sb) == 0)
 566                         restart_point = sb.st_size;
 567         }
 568         if (urltype == FILE_URL_T) {            /* file:// URLs */
 569                 direction = "copied";
 570                 fin = fopen(decodedpath, "r");
 571                 if (fin == NULL) {
 572                         warn("Can't open `%s'", decodedpath);
 573                         goto cleanup_fetch_url;
 574                 }
 575                 if (fstat(fileno(fin), &sb) == 0) {
 576                         mtime = sb.st_mtime;
 577                         filesize = sb.st_size;
 578                 }
 579                 if (restart_point) {
 580                         if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
 581                                 warn("Can't seek to restart `%s'",
 582                                     decodedpath);
 583                                 goto cleanup_fetch_url;
 584                         }
 585                 }
 586                 if (verbose) {
 587                         fprintf(ttyout, "Copying %s", decodedpath);
 588                         if (restart_point)
 589                                 fprintf(ttyout, " (restarting at " LLF ")",
 590                                     (LLT)restart_point);
 591                         fputs("\n", ttyout);
 592                 }
 593         } else {                                /* ftp:// or http:// URLs */
 594                 char *leading;
 595                 int hasleading;
 596
 597                 if (proxyenv == NULL) {
 598                         if (urltype == HTTP_URL_T)
 599                                 proxyenv = getoptionvalue("http_proxy");
 600                         else if (urltype == FTP_URL_T)
 601                                 proxyenv = getoptionvalue("ftp_proxy");
 602                 }
 603                 direction = "retrieved";
 604                 if (! EMPTYSTRING(proxyenv)) {                  /* use proxy */
 605                         url_t purltype;
 606                         char *phost, *ppath;
 607                         char *pport, *no_proxy;
 608
 609                         isproxy = 1;
 610
 611                                 /* check URL against list of no_proxied sites */
 612                         no_proxy = getoptionvalue("no_proxy");
 613                         if (! EMPTYSTRING(no_proxy)) {
 614                                 char *np, *np_copy, *np_iter;
 615                                 long np_port;
 616                                 size_t hlen, plen;
 617
 618                                 np_iter = np_copy = ftp_strdup(no_proxy);
 619                                 hlen = strlen(host);
 620                                 while ((cp = strsep(&np_iter, " ,")) != NULL) {
 621                                         if (*cp == '\0')
 622                                                 continue;
 623                                         if ((np = strrchr(cp, ':')) != NULL) {
 624                                                 *np = '\0';
 625                                                 np_port =
 626                                                     strtol(np + 1, &ep, 10);
 627                                                 if (*ep != '\0')
 628                                                         continue;
 629                                                 if (np_port != portnum)
 630                                                         continue;
 631                                         }
 632                                         plen = strlen(cp);
 633                                         if (hlen < plen)
 634                                                 continue;
 635                                         if (strncasecmp(host + hlen - plen,
 636                                             cp, plen) == 0) {
 637                                                 isproxy = 0;
 638                                                 break;
 639                                         }
 640                                 }
 641                                 FREEPTR(np_copy);
 642                                 if (isproxy == 0 && urltype == FTP_URL_T) {
 643                                         rval = fetch_ftp(url);
 644                                         goto cleanup_fetch_url;
 645                                 }
 646                         }
 647
 648                         if (isproxy) {
 649                                 if (parse_url(proxyenv, "proxy URL", &purltype,
 650                                     &puser, &ppass, &phost, &pport, &portnum,
 651                                     &ppath) == -1)
 652                                         goto cleanup_fetch_url;
 653
 654                                 if ((purltype != HTTP_URL_T
 655                                      && purltype != FTP_URL_T) ||
 656                                     EMPTYSTRING(phost) ||
 657                                     (! EMPTYSTRING(ppath)
 658                                      && strcmp(ppath, "/") != 0)) {
 659                                         warnx("Malformed proxy URL `%s'",
 660                                             proxyenv);
 661                                         FREEPTR(phost);
 662                                         FREEPTR(pport);
 663                                         FREEPTR(ppath);
 664                                         goto cleanup_fetch_url;
 665                                 }
 666                                 if (isipv6addr(host) &&
 667                                     strchr(host, '%') != NULL) {
 668                                         warnx(
 669 "Scoped address notation `%s' disallowed via web proxy",
 670                                             host);
 671                                         FREEPTR(phost);
 672                                         FREEPTR(pport);
 673                                         FREEPTR(ppath);
 674                                         goto cleanup_fetch_url;
 675                                 }
 676
 677                                 FREEPTR(host);
 678                                 host = phost;
 679                                 FREEPTR(port);
 680                                 port = pport;
 681                                 FREEPTR(path);
 682                                 path = ftp_strdup(url);
 683                                 FREEPTR(ppath);
 684                         }
 685                 } /* ! EMPTYSTRING(proxyenv) */
 686
 687                 memset(&hints, 0, sizeof(hints));
 688                 hints.ai_flags = 0;
 689                 hints.ai_family = family;
 690                 hints.ai_socktype = SOCK_STREAM;
 691                 hints.ai_protocol = 0;
 692                 error = getaddrinfo(host, NULL, &hints, &res0);
 693                 if (error) {
 694                         warnx("Can't lookup `%s': %s", host,
 695                             (error == EAI_SYSTEM) ? strerror(errno)
 696                                                   : 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                         ai_unmapped(res);
 705                         if (getnameinfo(res->ai_addr, res->ai_addrlen,
 706                             hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
 707                                 strlcpy(hbuf, "?", sizeof(hbuf));
 708
 709                         if (verbose && res0->ai_next) {
 710                                 fprintf(ttyout, "Trying %s...\n", hbuf);
 711                         }
 712
 713                         ((struct sockaddr_in *)res->ai_addr)->sin_port =
 714                             htons(portnum);
 715                         s = socket(res->ai_family, SOCK_STREAM,
 716                             res->ai_protocol);
 717                         if (s < 0) {
 718                                 warn(
 719                                   "Can't create socket for connection to `%s'",
 720                                     hbuf);
 721                                 continue;
 722                         }
 723
 724                         if (ftp_connect(s, res->ai_addr, res->ai_addrlen) < 0) {
 725                                 close(s);
 726                                 s = -1;
 727                                 continue;
 728                         }
 729
 730                         /* success */
 731                         break;
 732                 }
 733
 734                 if (s < 0) {
 735                         warnx("Can't connect to `%s'", host);
 736                         goto cleanup_fetch_url;
 737                 }
 738
 739                 fin = fdopen(s, "r+");
 740                 /*
 741                  * Construct and send the request.
 742                  */
 743                 if (verbose)
 744                         fprintf(ttyout, "Requesting %s\n", url);
 745                 leading = "  (";
 746                 hasleading = 0;
 747                 if (isproxy) {
 748                         if (verbose) {
 749                                 fprintf(ttyout, "%svia %s:%s", leading,
 750                                     host, port);
 751                                 leading = ", ";
 752                                 hasleading++;
 753                         }
 754                         fprintf(fin, "GET %s HTTP/1.0\r\n", path);
 755                         if (flushcache)
 756                                 fprintf(fin, "Pragma: no-cache\r\n");
 757                 } else {
 758                         fprintf(fin, "GET %s HTTP/1.1\r\n", path);
 759                         if (strchr(host, ':')) {
 760                                 char *h, *p;
 761
 762                                 /*
 763                                  * strip off IPv6 scope identifier, since it is
 764                                  * local to the node
 765                                  */
 766                                 h = ftp_strdup(host);
 767                                 if (isipv6addr(h) &&
 768                                     (p = strchr(h, '%')) != NULL) {
 769                                         *p = '\0';
 770                                 }
 771                                 fprintf(fin, "Host: [%s]", h);
 772                                 free(h);
 773                         } else
 774                                 fprintf(fin, "Host: %s", host);
 775                         if (portnum != HTTP_PORT)
 776                                 fprintf(fin, ":%u", portnum);
 777                         fprintf(fin, "\r\n");
 778                         fprintf(fin, "Accept: */*\r\n");
 779                         fprintf(fin, "Connection: close\r\n");
 780                         if (restart_point) {
 781                                 fputs(leading, ttyout);
 782                                 fprintf(fin, "Range: bytes=" LLF "-\r\n",
 783                                     (LLT)restart_point);
 784                                 fprintf(ttyout, "restarting at " LLF,
 785                                     (LLT)restart_point);
 786                                 leading = ", ";
 787                                 hasleading++;
 788                         }
 789                         if (flushcache)
 790                                 fprintf(fin, "Cache-Control: no-cache\r\n");
 791                 }
 792                 if ((useragent=getenv("FTPUSERAGENT")) != NULL) {
 793                         fprintf(fin, "User-Agent: %s\r\n", useragent);
 794                 } else {
 795                         fprintf(fin, "User-Agent: %s/%s\r\n",
 796                             FTP_PRODUCT, FTP_VERSION);
 797                 }
 798                 if (wwwauth) {
 799                         if (verbose) {
 800                                 fprintf(ttyout, "%swith authorization",
 801                                     leading);
 802                                 leading = ", ";
 803                                 hasleading++;
 804                         }
 805                         fprintf(fin, "Authorization: %s\r\n", wwwauth);
 806                 }
 807                 if (proxyauth) {
 808                         if (verbose) {
 809                                 fprintf(ttyout,
 810                                     "%swith proxy authorization", leading);
 811                                 leading = ", ";
 812                                 hasleading++;
 813                         }
 814                         fprintf(fin, "Proxy-Authorization: %s\r\n", proxyauth);
 815                 }
 816                 if (verbose && hasleading)
 817                         fputs(")\n", ttyout);
 818                 fprintf(fin, "\r\n");
 819                 if (fflush(fin) == EOF) {
 820                         warn("Writing HTTP request");
 821                         goto cleanup_fetch_url;
 822                 }
 823
 824                                 /* Read the response */
 825                 if ((buf = fparseln(fin, &len, NULL, "\0\0\0", 0)) == NULL) {
 826                         warn("Receiving HTTP reply");
 827                         goto cleanup_fetch_url;
 828                 }
 829                 while (len > 0 && (ISLWS(buf[len-1])))
 830                         buf[--len] = '\0';
 831                 DPRINTF("received `%s'\n", buf);
 832
 833                                 /* Determine HTTP response code */
 834                 cp = strchr(buf, ' ');
 835                 if (cp == NULL)
 836                         goto improper;
 837                 else
 838                         cp++;
 839                 hcode = strtol(cp, &ep, 10);
 840                 if (*ep != '\0' && !isspace((unsigned char)*ep))
 841                         goto improper;
 842                 message = ftp_strdup(cp);
 843
 844                                 /* Read the rest of the header. */
 845                 while (1) {
 846                         FREEPTR(buf);
 847                         if ((buf = fparseln(fin, &len, NULL, "\0\0\0", 0))
 848                             == NULL) {
 849                                 warn("Receiving HTTP reply");
 850                                 goto cleanup_fetch_url;
 851                         }
 852                         while (len > 0 && (ISLWS(buf[len-1])))
 853                                 buf[--len] = '\0';
 854                         if (len == 0)
 855                                 break;
 856                         DPRINTF("received `%s'\n", buf);
 857
 858                 /*
 859                  * Look for some headers
 860                  */
 861
 862                         cp = buf;
 863
 864                         if (match_token(&cp, "Content-Length:")) {
 865                                 filesize = STRTOLL(cp, &ep, 10);
 866                                 if (filesize < 0 || *ep != '\0')
 867                                         goto improper;
 868                                 DPRINTF("parsed len as: " LLF "\n",
 869                                     (LLT)filesize);
 870
 871                         } else if (match_token(&cp, "Content-Range:")) {
 872                                 if (! match_token(&cp, "bytes"))
 873                                         goto improper;
 874
 875                                 if (*cp == '*')
 876                                         cp++;
 877                                 else {
 878                                         rangestart = STRTOLL(cp, &ep, 10);
 879                                         if (rangestart < 0 || *ep != '-')
 880                                                 goto improper;
 881                                         cp = ep + 1;
 882                                         rangeend = STRTOLL(cp, &ep, 10);
 883                                         if (rangeend < 0 || rangeend < rangestart)
 884                                                 goto improper;
 885                                         cp = ep;
 886                                 }
 887                                 if (*cp != '/')
 888                                         goto improper;
 889                                 cp++;
 890                                 if (*cp == '*')
 891                                         cp++;
 892                                 else {
 893                                         entitylen = STRTOLL(cp, &ep, 10);
 894                                         if (entitylen < 0)
 895                                                 goto improper;
 896                                         cp = ep;
 897                                 }
 898                                 if (*cp != '\0')
 899                                         goto improper;
 900
 901 #ifndef NO_DEBUG
 902                                 if (ftp_debug) {
 903                                         fprintf(ttyout, "parsed range as: ");
 904                                         if (rangestart == -1)
 905                                                 fprintf(ttyout, "*");
 906                                         else
 907                                                 fprintf(ttyout, LLF "-" LLF,
 908                                                     (LLT)rangestart,
 909                                                     (LLT)rangeend);
 910                                         fprintf(ttyout, "/" LLF "\n", (LLT)entitylen);
 911                                 }
 912 #endif
 913                                 if (! restart_point) {
 914                                         warnx(
 915                                     "Received unexpected Content-Range header");
 916                                         goto cleanup_fetch_url;
 917                                 }
 918
 919                         } else if (match_token(&cp, "Last-Modified:")) {
 920                                 struct tm parsed;
 921                                 char *t;
 922
 923                                                         /* RFC 1123 */
 924                                 if ((t = strptime(cp,
 925                                                 "%a, %d %b %Y %H:%M:%S GMT",
 926                                                 &parsed))
 927                                                         /* RFC 850 */
 928                                     || (t = strptime(cp,
 929                                                 "%a, %d-%b-%y %H:%M:%S GMT",
 930                                                 &parsed))
 931                                                         /* asctime */
 932                                     || (t = strptime(cp,
 933                                                 "%a, %b %d %H:%M:%S %Y",
 934                                                 &parsed))) {
 935                                         parsed.tm_isdst = -1;
 936                                         if (*t == '\0')
 937                                                 mtime = timegm(&parsed);
 938 #ifndef NO_DEBUG
 939                                         if (ftp_debug && mtime != -1) {
 940                                                 fprintf(ttyout,
 941                                                     "parsed date as: %s",
 942                                                     ctime(&mtime));
 943                                         }
 944 #endif
 945                                 }
 946
 947                         } else if (match_token(&cp, "Location:")) {
 948                                 location = ftp_strdup(cp);
 949                                 DPRINTF("parsed location as `%s'\n", cp);
 950
 951                         } else if (match_token(&cp, "Transfer-Encoding:")) {
 952                                 if (match_token(&cp, "binary")) {
 953                                         warnx(
 954                         "Bogus transfer encoding `binary' (fetching anyway)");
 955                                         continue;
 956                                 }
 957                                 if (! (token = match_token(&cp, "chunked"))) {
 958                                         warnx(
 959                                     "Unsupported transfer encoding `%s'",
 960                                             token);
 961                                         goto cleanup_fetch_url;
 962                                 }
 963                                 ischunked++;
 964                                 DPRINTF("using chunked encoding\n");
 965
 966                         } else if (match_token(&cp, "Proxy-Authenticate:")
 967                                 || match_token(&cp, "WWW-Authenticate:")) {
 968                                 if (! (token = match_token(&cp, "Basic"))) {
 969                                         DPRINTF(
 970                                 "skipping unknown auth scheme `%s'\n",
 971                                                     token);
 972                                         continue;
 973                                 }
 974                                 FREEPTR(auth);
 975                                 auth = ftp_strdup(token);
 976                                 DPRINTF("parsed auth as `%s'\n", cp);
 977                         }
 978
 979                 }
 980                                 /* finished parsing header */
 981                 FREEPTR(buf);
 982
 983                 switch (hcode) {
 984                 case 200:
 985                         break;
 986                 case 206:
 987                         if (! restart_point) {
 988                                 warnx("Not expecting partial content header");
 989                                 goto cleanup_fetch_url;
 990                         }
 991                         break;
 992                 case 300:
 993                 case 301:
 994                 case 302:
 995                 case 303:
 996                 case 305:
 997                 case 307:
 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 execute `%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 = ftp_malloc(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 = ftp_strdup(url);
1358                 cp = strchr(host, '@');
1359                 if (cp != NULL) {
1360                         *cp = '\0';
1361                         user = host;
1362                         anonftp = 0;    /* disable anonftp */
1363                         host = ftp_strdup(cp + 1);
1364                 }
1365                 cp = strchr(host, ':');
1366                 if (cp != NULL) {
1367                         *cp = '\0';
1368                         path = ftp_strdup(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(port);
1621         FREEPTR(host);
1622         FREEPTR(path);
1623         FREEPTR(user);
1624         if (pass)
1625                 memset(pass, 0, strlen(pass));
1626         FREEPTR(pass);
1627         return (rval);
1628 }
1629
1630 /*
1631  * Retrieve the given file to outfile.
1632  * Supports arguments of the form:
1633  *      "host:path", "ftp://host/path"  if $ftpproxy, call fetch_url() else
1634  *                                      call fetch_ftp()
1635  *      "http://host/path"              call fetch_url() to use HTTP
1636  *      "file:///path"                  call fetch_url() to copy
1637  *      "about:..."                     print a message
1638  *
1639  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1640  * is still open (e.g, ftp xfer with trailing /)
1641  */
1642 static int
1643 go_fetch(const char *url)
1644 {
1645         char *proxy;
1646
1647 #ifndef NO_ABOUT
1648         /*
1649          * Check for about:*
1650          */
1651         if (STRNEQUAL(url, ABOUT_URL)) {
1652                 url += sizeof(ABOUT_URL) -1;
1653                 if (strcasecmp(url, "ftp") == 0 ||
1654                     strcasecmp(url, "tnftp") == 0) {
1655                         fputs(
1656 "This version of ftp has been enhanced by Luke Mewburn <lukem@NetBSD.org>\n"
1657 "for the NetBSD project.  Execute `man ftp' for more details.\n", ttyout);
1658                 } else if (strcasecmp(url, "lukem") == 0) {
1659                         fputs(
1660 "Luke Mewburn is the author of most of the enhancements in this ftp client.\n"
1661 "Please email feedback to <lukem@NetBSD.org>.\n", ttyout);
1662                 } else if (strcasecmp(url, "netbsd") == 0) {
1663                         fputs(
1664 "NetBSD is a freely available and redistributable UNIX-like operating system.\n"
1665 "For more information, see http://www.NetBSD.org/\n", ttyout);
1666                 } else if (strcasecmp(url, "version") == 0) {
1667                         fprintf(ttyout, "Version: %s %s%s\n",
1668                             FTP_PRODUCT, FTP_VERSION,
1669 #ifdef INET6
1670                             ""
1671 #else
1672                             " (-IPv6)"
1673 #endif
1674                         );
1675                 } else {
1676                         fprintf(ttyout, "`%s' is an interesting topic.\n", url);
1677                 }
1678                 fputs("\n", ttyout);
1679                 return (0);
1680         }
1681 #endif
1682
1683         /*
1684          * Check for file:// and http:// URLs.
1685          */
1686         if (STRNEQUAL(url, HTTP_URL) || STRNEQUAL(url, FILE_URL))
1687                 return (fetch_url(url, NULL, NULL, NULL));
1688
1689         /*
1690          * Try FTP URL-style and host:file arguments next.
1691          * If ftpproxy is set with an FTP URL, use fetch_url()
1692          * Othewise, use fetch_ftp().
1693          */
1694         proxy = getoptionvalue("ftp_proxy");
1695         if (!EMPTYSTRING(proxy) && STRNEQUAL(url, FTP_URL))
1696                 return (fetch_url(url, NULL, NULL, NULL));
1697
1698         return (fetch_ftp(url));
1699 }
1700
1701 /*
1702  * Retrieve multiple files from the command line,
1703  * calling go_fetch() for each file.
1704  *
1705  * If an ftp path has a trailing "/", the path will be cd-ed into and
1706  * the connection remains open, and the function will return -1
1707  * (to indicate the connection is alive).
1708  * If an error occurs the return value will be the offset+1 in
1709  * argv[] of the file that caused a problem (i.e, argv[x]
1710  * returns x+1)
1711  * Otherwise, 0 is returned if all files retrieved successfully.
1712  */
1713 int
1714 auto_fetch(int argc, char *argv[])
1715 {
1716         volatile int    argpos, rval;
1717
1718         argpos = rval = 0;
1719
1720         if (sigsetjmp(toplevel, 1)) {
1721                 if (connected)
1722                         disconnect(0, NULL);
1723                 if (rval > 0)
1724                         rval = argpos + 1;
1725                 return (rval);
1726         }
1727         (void)xsignal(SIGINT, intr);
1728         (void)xsignal(SIGPIPE, lostpeer);
1729
1730         /*
1731          * Loop through as long as there's files to fetch.
1732          */
1733         for (; (rval == 0) && (argpos < argc); argpos++) {
1734                 if (strchr(argv[argpos], ':') == NULL)
1735                         break;
1736                 redirect_loop = 0;
1737                 if (!anonftp)
1738                         anonftp = 2;    /* Handle "automatic" transfers. */
1739                 rval = go_fetch(argv[argpos]);
1740                 if (outfile != NULL && strcmp(outfile, "-") != 0
1741                     && outfile[0] != '|')
1742                         outfile = NULL;
1743                 if (rval > 0)
1744                         rval = argpos + 1;
1745         }
1746
1747         if (connected && rval != -1)
1748                 disconnect(0, NULL);
1749         return (rval);
1750 }
1751
1752
1753 /*
1754  * Upload multiple files from the command line.
1755  *
1756  * If an error occurs the return value will be the offset+1 in
1757  * argv[] of the file that caused a problem (i.e, argv[x]
1758  * returns x+1)
1759  * Otherwise, 0 is returned if all files uploaded successfully.
1760  */
1761 int
1762 auto_put(int argc, char **argv, const char *uploadserver)
1763 {
1764         char    *uargv[4], *path, *pathsep;
1765         int      uargc, rval, argpos;
1766         size_t   len;
1767
1768         uargc = 0;
1769         uargv[uargc++] = "mput";
1770         uargv[uargc++] = argv[0];
1771         uargv[2] = uargv[3] = NULL;
1772         pathsep = NULL;
1773         rval = 1;
1774
1775         DPRINTF("auto_put: target `%s'\n", uploadserver);
1776
1777         path = ftp_strdup(uploadserver);
1778         len = strlen(path);
1779         if (path[len - 1] != '/' && path[len - 1] != ':') {
1780                         /*
1781                          * make sure we always pass a directory to auto_fetch
1782                          */
1783                 if (argc > 1) {         /* more than one file to upload */
1784                         len = strlen(uploadserver) + 2; /* path + "/" + "\0" */
1785                         free(path);
1786                         path = (char *)ftp_malloc(len);
1787                         (void)strlcpy(path, uploadserver, len);
1788                         (void)strlcat(path, "/", len);
1789                 } else {                /* single file to upload */
1790                         uargv[0] = "put";
1791                         pathsep = strrchr(path, '/');
1792                         if (pathsep == NULL) {
1793                                 pathsep = strrchr(path, ':');
1794                                 if (pathsep == NULL) {
1795                                         warnx("Invalid URL `%s'", path);
1796                                         goto cleanup_auto_put;
1797                                 }
1798                                 pathsep++;
1799                                 uargv[2] = ftp_strdup(pathsep);
1800                                 pathsep[0] = '/';
1801                         } else
1802                                 uargv[2] = ftp_strdup(pathsep + 1);
1803                         pathsep[1] = '\0';
1804                         uargc++;
1805                 }
1806         }
1807         DPRINTF("auto_put: URL `%s' argv[2] `%s'\n",
1808             path, uargv[2] ? uargv[2] : "<null>");
1809
1810                         /* connect and cwd */
1811         rval = auto_fetch(1, &path);
1812         if(rval >= 0)
1813                 goto cleanup_auto_put;
1814
1815         rval = 0;
1816
1817                         /* target filename provided; upload 1 file */
1818                         /* XXX : is this the best way? */
1819         if (uargc == 3) {
1820                 uargv[1] = argv[0];
1821                 put(uargc, uargv);
1822                 if ((code / 100) != COMPLETE)
1823                         rval = 1;
1824         } else {        /* otherwise a target dir: upload all files to it */
1825                 for(argpos = 0; argv[argpos] != NULL; argpos++) {
1826                         uargv[1] = argv[argpos];
1827                         mput(uargc, uargv);
1828                         if ((code / 100) != COMPLETE) {
1829                                 rval = argpos + 1;
1830                                 break;
1831                         }
1832                 }
1833         }
1834
1835  cleanup_auto_put:
1836         free(path);
1837         FREEPTR(uargv[2]);
1838         return (rval);
1839 }