contrib/tnftp/fetch.c

   1 /*      $NetBSD: fetch.c,v 1.195 2011/12/10 05:53:58 lukem Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1997-2009 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  *
  22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 __RCSID("$NetBSD: fetch.c,v 1.195 2011/12/10 05:53:58 lukem Exp $");
  38 #endif /* not lint */
  39
  40 /*
  41  * FTP User Program -- Command line file retrieval
  42  */
  43
  44 #include <sys/types.h>
  45 #include <sys/param.h>
  46 #include <sys/socket.h>
  47 #include <sys/stat.h>
  48 #include <sys/time.h>
  49
  50 #include <netinet/in.h>
  51
  52 #include <arpa/ftp.h>
  53 #include <arpa/inet.h>
  54
  55 #include <assert.h>
  56 #include <ctype.h>
  57 #include <err.h>
  58 #include <errno.h>
  59 #include <netdb.h>
  60 #include <fcntl.h>
  61 #include <stdio.h>
  62 #include <libutil.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <unistd.h>
  66 #include <time.h>
  67
  68 #include "ftp_var.h"
  69 #include "version.h"
  70
  71 typedef enum {
  72         UNKNOWN_URL_T=-1,
  73         HTTP_URL_T,
  74         FTP_URL_T,
  75         FILE_URL_T,
  76         CLASSIC_URL_T
  77 } url_t;
  78
  79 __dead static void      aborthttp(int);
  80 #ifndef NO_AUTH
  81 static int      auth_url(const char *, char **, const char *, const char *);
  82 static void     base64_encode(const unsigned char *, size_t, unsigned char *);
  83 #endif
  84 static int      go_fetch(const char *);
  85 static int      fetch_ftp(const char *);
  86 static int      fetch_url(const char *, const char *, char *, char *);
  87 static const char *match_token(const char **, const char *);
  88 static int      parse_url(const char *, const char *, url_t *, char **,
  89                             char **, char **, char **, in_port_t *, char **);
  90 static void     url_decode(char *);
  91
  92 static int      redirect_loop;
  93
  94
  95 #define STRNEQUAL(a,b)  (strncasecmp((a), (b), sizeof((b))-1) == 0)
  96 #define ISLWS(x)        ((x)=='\r' || (x)=='\n' || (x)==' ' || (x)=='\t')
  97 #define SKIPLWS(x)      do { while (ISLWS((*x))) x++; } while (0)
  98
  99
 100 #define ABOUT_URL       "about:"        /* propaganda */
 101 #define FILE_URL        "file://"       /* file URL prefix */
 102 #define FTP_URL         "ftp://"        /* ftp URL prefix */
 103 #define HTTP_URL        "http://"       /* http URL prefix */
 104
 105
 106 /*
 107  * Determine if token is the next word in buf (case insensitive).
 108  * If so, advance buf past the token and any trailing LWS, and
 109  * return a pointer to the token (in buf).  Otherwise, return NULL.
 110  * token may be preceded by LWS.
 111  * token must be followed by LWS or NUL.  (I.e, don't partial match).
 112  */
 113 static const char *
 114 match_token(const char **buf, const char *token)
 115 {
 116         const char      *p, *orig;
 117         size_t          tlen;
 118
 119         tlen = strlen(token);
 120         p = *buf;
 121         SKIPLWS(p);
 122         orig = p;
 123         if (strncasecmp(p, token, tlen) != 0)
 124                 return NULL;
 125         p += tlen;
 126         if (*p != '\0' && !ISLWS(*p))
 127                 return NULL;
 128         SKIPLWS(p);
 129         orig = *buf;
 130         *buf = p;
 131         return orig;
 132 }
 133
 134 #ifndef NO_AUTH
 135 /*
 136  * Generate authorization response based on given authentication challenge.
 137  * Returns -1 if an error occurred, otherwise 0.
 138  * Sets response to a malloc(3)ed string; caller should free.
 139  */
 140 static int
 141 auth_url(const char *challenge, char **response, const char *guser,
 142         const char *gpass)
 143 {
 144         const char      *cp, *scheme, *errormsg;
 145         char            *ep, *clear, *realm;
 146         char             uuser[BUFSIZ], *gotpass;
 147         const char      *upass;
 148         int              rval;
 149         size_t           len, clen, rlen;
 150
 151         *response = NULL;
 152         clear = realm = NULL;
 153         rval = -1;
 154         cp = challenge;
 155         scheme = "Basic";       /* only support Basic authentication */
 156         gotpass = NULL;
 157
 158         DPRINTF("auth_url: challenge `%s'\n", challenge);
 159
 160         if (! match_token(&cp, scheme)) {
 161                 warnx("Unsupported authentication challenge `%s'",
 162                     challenge);
 163                 goto cleanup_auth_url;
 164         }
 165
 166 #define REALM "realm=\""
 167         if (STRNEQUAL(cp, REALM))
 168                 cp += sizeof(REALM) - 1;
 169         else {
 170                 warnx("Unsupported authentication challenge `%s'",
 171                     challenge);
 172                 goto cleanup_auth_url;
 173         }
 174 /* XXX: need to improve quoted-string parsing to support \ quoting, etc. */
 175         if ((ep = strchr(cp, '\"')) != NULL) {
 176                 len = ep - cp;
 177                 realm = (char *)ftp_malloc(len + 1);
 178                 (void)strlcpy(realm, cp, len + 1);
 179         } else {
 180                 warnx("Unsupported authentication challenge `%s'",
 181                     challenge);
 182                 goto cleanup_auth_url;
 183         }
 184
 185         fprintf(ttyout, "Username for `%s': ", realm);
 186         if (guser != NULL) {
 187                 (void)strlcpy(uuser, guser, sizeof(uuser));
 188                 fprintf(ttyout, "%s\n", uuser);
 189         } else {
 190                 (void)fflush(ttyout);
 191                 if (get_line(stdin, uuser, sizeof(uuser), &errormsg) < 0) {
 192                         warnx("%s; can't authenticate", errormsg);
 193                         goto cleanup_auth_url;
 194                 }
 195         }
 196         if (gpass != NULL)
 197                 upass = gpass;
 198         else {
 199                 gotpass = getpass("Password: ");
 200                 if (gotpass == NULL) {
 201                         warnx("Can't read password");
 202                         goto cleanup_auth_url;
 203                 }
 204                 upass = gotpass;
 205         }
 206
 207         clen = strlen(uuser) + strlen(upass) + 2;       /* user + ":" + pass + "\0" */
 208         clear = (char *)ftp_malloc(clen);
 209         (void)strlcpy(clear, uuser, clen);
 210         (void)strlcat(clear, ":", clen);
 211         (void)strlcat(clear, upass, clen);
 212         if (gotpass)
 213                 memset(gotpass, 0, strlen(gotpass));
 214
 215                                                 /* scheme + " " + enc + "\0" */
 216         rlen = strlen(scheme) + 1 + (clen + 2) * 4 / 3 + 1;
 217         *response = (char *)ftp_malloc(rlen);
 218         (void)strlcpy(*response, scheme, rlen);
 219         len = strlcat(*response, " ", rlen);
 220                         /* use  `clen - 1'  to not encode the trailing NUL */
 221         base64_encode((unsigned char *)clear, clen - 1,
 222             (unsigned char *)*response + len);
 223         memset(clear, 0, clen);
 224         rval = 0;
 225
 226  cleanup_auth_url:
 227         FREEPTR(clear);
 228         FREEPTR(realm);
 229         return (rval);
 230 }
 231
 232 /*
 233  * Encode len bytes starting at clear using base64 encoding into encoded,
 234  * which should be at least ((len + 2) * 4 / 3 + 1) in size.
 235  */
 236 static void
 237 base64_encode(const unsigned char *clear, size_t len, unsigned char *encoded)
 238 {
 239         static const unsigned char enc[] =
 240             "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 241         unsigned char   *cp;
 242         size_t   i;
 243
 244         cp = encoded;
 245         for (i = 0; i < len; i += 3) {
 246                 *(cp++) = enc[((clear[i + 0] >> 2))];
 247                 *(cp++) = enc[((clear[i + 0] << 4) & 0x30)
 248                             | ((clear[i + 1] >> 4) & 0x0f)];
 249                 *(cp++) = enc[((clear[i + 1] << 2) & 0x3c)
 250                             | ((clear[i + 2] >> 6) & 0x03)];
 251                 *(cp++) = enc[((clear[i + 2]     ) & 0x3f)];
 252         }
 253         *cp = '\0';
 254         while (i-- > len)
 255                 *(--cp) = '=';
 256 }
 257 #endif
 258
 259 /*
 260  * Decode %xx escapes in given string, `in-place'.
 261  */
 262 static void
 263 url_decode(char *url)
 264 {
 265         unsigned char *p, *q;
 266
 267         if (EMPTYSTRING(url))
 268                 return;
 269         p = q = (unsigned char *)url;
 270
 271 #define HEXTOINT(x) (x - (isdigit(x) ? '0' : (islower(x) ? 'a' : 'A') - 10))
 272         while (*p) {
 273                 if (p[0] == '%'
 274                     && p[1] && isxdigit((unsigned char)p[1])
 275                     && p[2] && isxdigit((unsigned char)p[2])) {
 276                         *q++ = HEXTOINT(p[1]) * 16 + HEXTOINT(p[2]);
 277                         p+=3;
 278                 } else
 279                         *q++ = *p++;
 280         }
 281         *q = '\0';
 282 }
 283
 284
 285 /*
 286  * Parse URL of form (per RFC 3986):
 287  *      <type>://[<user>[:<password>]@]<host>[:<port>][/<path>]
 288  * Returns -1 if a parse error occurred, otherwise 0.
 289  * It's the caller's responsibility to url_decode() the returned
 290  * user, pass and path.
 291  *
 292  * Sets type to url_t, each of the given char ** pointers to a
 293  * malloc(3)ed strings of the relevant section, and port to
 294  * the number given, or ftpport if ftp://, or httpport if http://.
 295  *
 296  * XXX: this is not totally RFC 3986 compliant; <path> will have the
 297  * leading `/' unless it's an ftp:// URL, as this makes things easier
 298  * for file:// and http:// URLs.  ftp:// URLs have the `/' between the
 299  * host and the URL-path removed, but any additional leading slashes
 300  * in the URL-path are retained (because they imply that we should
 301  * later do "CWD" with a null argument).
 302  *
 303  * Examples:
 304  *       input URL                       output path
 305  *       ---------                       -----------
 306  *      "http://host"                   "/"
 307  *      "http://host/"                  "/"
 308  *      "http://host/path"              "/path"
 309  *      "file://host/dir/file"          "dir/file"
 310  *      "ftp://host"                    ""
 311  *      "ftp://host/"                   ""
 312  *      "ftp://host//"                  "/"
 313  *      "ftp://host/dir/file"           "dir/file"
 314  *      "ftp://host//dir/file"          "/dir/file"
 315  */
 316 static int
 317 parse_url(const char *url, const char *desc, url_t *utype,
 318                 char **uuser, char **pass, char **host, char **port,
 319                 in_port_t *portnum, char **path)
 320 {
 321         const char      *origurl, *tport;
 322         char            *cp, *ep, *thost;
 323         size_t           len;
 324
 325         if (url == NULL || desc == NULL || utype == NULL || uuser == NULL
 326             || pass == NULL || host == NULL || port == NULL || portnum == NULL
 327             || path == NULL)
 328                 errx(1, "parse_url: invoked with NULL argument!");
 329         DPRINTF("parse_url: %s `%s'\n", desc, url);
 330
 331         origurl = url;
 332         *utype = UNKNOWN_URL_T;
 333         *uuser = *pass = *host = *port = *path = NULL;
 334         *portnum = 0;
 335         tport = NULL;
 336
 337         if (STRNEQUAL(url, HTTP_URL)) {
 338                 url += sizeof(HTTP_URL) - 1;
 339                 *utype = HTTP_URL_T;
 340                 *portnum = HTTP_PORT;
 341                 tport = httpport;
 342         } else if (STRNEQUAL(url, FTP_URL)) {
 343                 url += sizeof(FTP_URL) - 1;
 344                 *utype = FTP_URL_T;
 345                 *portnum = FTP_PORT;
 346                 tport = ftpport;
 347         } else if (STRNEQUAL(url, FILE_URL)) {
 348                 url += sizeof(FILE_URL) - 1;
 349                 *utype = FILE_URL_T;
 350         } else {
 351                 warnx("Invalid %s `%s'", desc, url);
 352  cleanup_parse_url:
 353                 FREEPTR(*uuser);
 354                 if (*pass != NULL)
 355                         memset(*pass, 0, strlen(*pass));
 356                 FREEPTR(*pass);
 357                 FREEPTR(*host);
 358                 FREEPTR(*port);
 359                 FREEPTR(*path);
 360                 return (-1);
 361         }
 362
 363         if (*url == '\0')
 364                 return (0);
 365
 366                         /* find [user[:pass]@]host[:port] */
 367         ep = strchr(url, '/');
 368         if (ep == NULL)
 369                 thost = ftp_strdup(url);
 370         else {
 371                 len = ep - url;
 372                 thost = (char *)ftp_malloc(len + 1);
 373                 (void)strlcpy(thost, url, len + 1);
 374                 if (*utype == FTP_URL_T)        /* skip first / for ftp URLs */
 375                         ep++;
 376                 *path = ftp_strdup(ep);
 377         }
 378
 379         cp = strchr(thost, '@');        /* look for user[:pass]@ in URLs */
 380         if (cp != NULL) {
 381                 if (*utype == FTP_URL_T)
 382                         anonftp = 0;    /* disable anonftp */
 383                 *uuser = thost;
 384                 *cp = '\0';
 385                 thost = ftp_strdup(cp + 1);
 386                 cp = strchr(*uuser, ':');
 387                 if (cp != NULL) {
 388                         *cp = '\0';
 389                         *pass = ftp_strdup(cp + 1);
 390                 }
 391                 url_decode(*uuser);
 392                 if (*pass)
 393                         url_decode(*pass);
 394         }
 395
 396 #ifdef INET6
 397                         /*
 398                          * Check if thost is an encoded IPv6 address, as per
 399                          * RFC 3986:
 400                          *      `[' ipv6-address ']'
 401                          */
 402         if (*thost == '[') {
 403                 cp = thost + 1;
 404                 if ((ep = strchr(cp, ']')) == NULL ||
 405                     (ep[1] != '\0' && ep[1] != ':')) {
 406                         warnx("Invalid address `%s' in %s `%s'",
 407                             thost, desc, origurl);
 408                         goto cleanup_parse_url;
 409                 }
 410                 len = ep - cp;          /* change `[xyz]' -> `xyz' */
 411                 memmove(thost, thost + 1, len);
 412                 thost[len] = '\0';
 413                 if (! isipv6addr(thost)) {
 414                         warnx("Invalid IPv6 address `%s' in %s `%s'",
 415                             thost, desc, origurl);
 416                         goto cleanup_parse_url;
 417                 }
 418                 cp = ep + 1;
 419                 if (*cp == ':')
 420                         cp++;
 421                 else
 422                         cp = NULL;
 423         } else
 424 #endif /* INET6 */
 425                 if ((cp = strchr(thost, ':')) != NULL)
 426                         *cp++ = '\0';
 427         *host = thost;
 428
 429                         /* look for [:port] */
 430         if (cp != NULL) {
 431                 unsigned long   nport;
 432
 433                 nport = strtoul(cp, &ep, 10);
 434                 if (*cp == '\0' || *ep != '\0' ||
 435                     nport < 1 || nport > MAX_IN_PORT_T) {
 436                         warnx("Unknown port `%s' in %s `%s'",
 437                             cp, desc, origurl);
 438                         goto cleanup_parse_url;
 439                 }
 440                 *portnum = nport;
 441                 tport = cp;
 442         }
 443
 444         if (tport != NULL)
 445                 *port = ftp_strdup(tport);
 446         if (*path == NULL) {
 447                 const char *emptypath = "/";
 448                 if (*utype == FTP_URL_T)        /* skip first / for ftp URLs */
 449                         emptypath++;
 450                 *path = ftp_strdup(emptypath);
 451         }
 452
 453         DPRINTF("parse_url: user `%s' pass `%s' host %s port %s(%d) "
 454             "path `%s'\n",
 455             STRorNULL(*uuser), STRorNULL(*pass),
 456             STRorNULL(*host), STRorNULL(*port),
 457             *portnum ? *portnum : -1, STRorNULL(*path));
 458
 459         return (0);
 460 }
 461
 462 sigjmp_buf      httpabort;
 463
 464 /*
 465  * Retrieve URL, via a proxy if necessary, using HTTP.
 466  * If proxyenv is set, use that for the proxy, otherwise try ftp_proxy or
 467  * http_proxy as appropriate.
 468  * Supports HTTP redirects.
 469  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
 470  * is still open (e.g, ftp xfer with trailing /)
 471  */
 472 static int
 473 fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth)
 474 {
 475         struct addrinfo         hints, *res, *res0 = NULL;
 476         int                     error;
 477         sigfunc volatile        oldintr;
 478         sigfunc volatile        oldintp;
 479         int volatile            s;
 480         struct stat             sb;
 481         int volatile            ischunked;
 482         int volatile            isproxy;
 483         int volatile            rval;
 484         int volatile            hcode;
 485         int                     len;
 486         size_t                  flen;
 487         static size_t           bufsize;
 488         static char             *xferbuf;
 489         const char              *cp, *token;
 490         char                    *ep;
 491         char                    buf[FTPBUFLEN];
 492         const char              *errormsg;
 493         char                    *volatile savefile;
 494         char                    *volatile auth;
 495         char                    *volatile location;
 496         char                    *volatile message;
 497         char                    *uuser, *pass, *host, *port, *path;
 498         char                    *volatile decodedpath;
 499         char                    *puser, *ppass, *useragent;
 500         off_t                   hashbytes, rangestart, rangeend, entitylen;
 501         int                     (*volatile closefunc)(FILE *);
 502         FILE                    *volatile fin;
 503         FILE                    *volatile fout;
 504         time_t                  mtime;
 505         url_t                   urltype;
 506         in_port_t               portnum;
 507
 508         DPRINTF("fetch_url: `%s' proxyenv `%s'\n", url, STRorNULL(proxyenv));
 509
 510         oldintr = oldintp = NULL;
 511         closefunc = NULL;
 512         fin = fout = NULL;
 513         s = -1;
 514         savefile = NULL;
 515         auth = location = message = NULL;
 516         ischunked = isproxy = hcode = 0;
 517         rval = 1;
 518         uuser = pass = host = path = decodedpath = puser = ppass = NULL;
 519
 520         if (parse_url(url, "URL", &urltype, &uuser, &pass, &host, &port,
 521             &portnum, &path) == -1)
 522                 goto cleanup_fetch_url;
 523
 524         if (urltype == FILE_URL_T && ! EMPTYSTRING(host)
 525             && strcasecmp(host, "localhost") != 0) {
 526                 warnx("No support for non local file URL `%s'", url);
 527                 goto cleanup_fetch_url;
 528         }
 529
 530         if (EMPTYSTRING(path)) {
 531                 if (urltype == FTP_URL_T) {
 532                         rval = fetch_ftp(url);
 533                         goto cleanup_fetch_url;
 534                 }
 535                 if (urltype != HTTP_URL_T || outfile == NULL)  {
 536                         warnx("Invalid URL (no file after host) `%s'", url);
 537                         goto cleanup_fetch_url;
 538                 }
 539         }
 540
 541         decodedpath = ftp_strdup(path);
 542         url_decode(decodedpath);
 543
 544         if (outfile)
 545                 savefile = ftp_strdup(outfile);
 546         else {
 547                 cp = strrchr(decodedpath, '/');         /* find savefile */
 548                 if (cp != NULL)
 549                         savefile = ftp_strdup(cp + 1);
 550                 else
 551                         savefile = ftp_strdup(decodedpath);
 552         }
 553         DPRINTF("fetch_url: savefile `%s'\n", savefile);
 554         if (EMPTYSTRING(savefile)) {
 555                 if (urltype == FTP_URL_T) {
 556                         rval = fetch_ftp(url);
 557                         goto cleanup_fetch_url;
 558                 }
 559                 warnx("No file after directory (you must specify an "
 560                     "output file) `%s'", url);
 561                 goto cleanup_fetch_url;
 562         }
 563
 564         restart_point = 0;
 565         filesize = -1;
 566         rangestart = rangeend = entitylen = -1;
 567         mtime = -1;
 568         if (restartautofetch) {
 569                 if (strcmp(savefile, "-") != 0 && *savefile != '|' &&
 570                     stat(savefile, &sb) == 0)
 571                         restart_point = sb.st_size;
 572         }
 573         if (urltype == FILE_URL_T) {            /* file:// URLs */
 574                 direction = "copied";
 575                 fin = fopen(decodedpath, "r");
 576                 if (fin == NULL) {
 577                         warn("Can't open `%s'", decodedpath);
 578                         goto cleanup_fetch_url;
 579                 }
 580                 if (fstat(fileno(fin), &sb) == 0) {
 581                         mtime = sb.st_mtime;
 582                         filesize = sb.st_size;
 583                 }
 584                 if (restart_point) {
 585                         if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
 586                                 warn("Can't seek to restart `%s'",
 587                                     decodedpath);
 588                                 goto cleanup_fetch_url;
 589                         }
 590                 }
 591                 if (verbose) {
 592                         fprintf(ttyout, "Copying %s", decodedpath);
 593                         if (restart_point)
 594                                 fprintf(ttyout, " (restarting at " LLF ")",
 595                                     (LLT)restart_point);
 596                         fputs("\n", ttyout);
 597                 }
 598         } else {                                /* ftp:// or http:// URLs */
 599                 const char *leading;
 600                 int hasleading;
 601
 602                 if (proxyenv == NULL) {
 603                         if (urltype == HTTP_URL_T)
 604                                 proxyenv = getoptionvalue("http_proxy");
 605                         else if (urltype == FTP_URL_T)
 606                                 proxyenv = getoptionvalue("ftp_proxy");
 607                 }
 608                 direction = "retrieved";
 609                 if (! EMPTYSTRING(proxyenv)) {                  /* use proxy */
 610                         url_t purltype;
 611                         char *phost, *ppath;
 612                         char *pport, *no_proxy;
 613                         in_port_t pportnum;
 614
 615                         isproxy = 1;
 616
 617                                 /* check URL against list of no_proxied sites */
 618                         no_proxy = getoptionvalue("no_proxy");
 619                         if (! EMPTYSTRING(no_proxy)) {
 620                                 char *np, *np_copy, *np_iter;
 621                                 unsigned long np_port;
 622                                 size_t hlen, plen;
 623
 624                                 np_iter = np_copy = ftp_strdup(no_proxy);
 625                                 hlen = strlen(host);
 626                                 while ((cp = strsep(&np_iter, " ,")) != NULL) {
 627                                         if (*cp == '\0')
 628                                                 continue;
 629                                         if ((np = strrchr(cp, ':')) != NULL) {
 630                                                 *np++ =  '\0';
 631                                                 np_port = strtoul(np, &ep, 10);
 632                                                 if (*np == '\0' || *ep != '\0')
 633                                                         continue;
 634                                                 if (np_port != portnum)
 635                                                         continue;
 636                                         }
 637                                         plen = strlen(cp);
 638                                         if (hlen < plen)
 639                                                 continue;
 640                                         if (strncasecmp(host + hlen - plen,
 641                                             cp, plen) == 0) {
 642                                                 isproxy = 0;
 643                                                 break;
 644                                         }
 645                                 }
 646                                 FREEPTR(np_copy);
 647                                 if (isproxy == 0 && urltype == FTP_URL_T) {
 648                                         rval = fetch_ftp(url);
 649                                         goto cleanup_fetch_url;
 650                                 }
 651                         }
 652
 653                         if (isproxy) {
 654                                 if (restart_point) {
 655                                         warnx("Can't restart via proxy URL `%s'",
 656                                             proxyenv);
 657                                         goto cleanup_fetch_url;
 658                                 }
 659                                 if (parse_url(proxyenv, "proxy URL", &purltype,
 660                                     &puser, &ppass, &phost, &pport, &pportnum,
 661                                     &ppath) == -1)
 662                                         goto cleanup_fetch_url;
 663
 664                                 if ((purltype != HTTP_URL_T
 665                                      && purltype != FTP_URL_T) ||
 666                                     EMPTYSTRING(phost) ||
 667                                     (! EMPTYSTRING(ppath)
 668                                      && strcmp(ppath, "/") != 0)) {
 669                                         warnx("Malformed proxy URL `%s'",
 670                                             proxyenv);
 671                                         FREEPTR(phost);
 672                                         FREEPTR(pport);
 673                                         FREEPTR(ppath);
 674                                         goto cleanup_fetch_url;
 675                                 }
 676                                 if (isipv6addr(host) &&
 677                                     strchr(host, '%') != NULL) {
 678                                         warnx(
 679 "Scoped address notation `%s' disallowed via web proxy",
 680                                             host);
 681                                         FREEPTR(phost);
 682                                         FREEPTR(pport);
 683                                         FREEPTR(ppath);
 684                                         goto cleanup_fetch_url;
 685                                 }
 686
 687                                 FREEPTR(host);
 688                                 host = phost;
 689                                 FREEPTR(port);
 690                                 port = pport;
 691                                 FREEPTR(path);
 692                                 path = ftp_strdup(url);
 693                                 FREEPTR(ppath);
 694                         }
 695                 } /* ! EMPTYSTRING(proxyenv) */
 696
 697                 memset(&hints, 0, sizeof(hints));
 698                 hints.ai_flags = 0;
 699                 hints.ai_family = family;
 700                 hints.ai_socktype = SOCK_STREAM;
 701                 hints.ai_protocol = 0;
 702                 error = getaddrinfo(host, port, &hints, &res0);
 703                 if (error) {
 704                         warnx("Can't lookup `%s:%s': %s", host, port,
 705                             (error == EAI_SYSTEM) ? strerror(errno)
 706                                                   : gai_strerror(error));
 707                         goto cleanup_fetch_url;
 708                 }
 709                 if (res0->ai_canonname)
 710                         host = res0->ai_canonname;
 711
 712                 s = -1;
 713                 for (res = res0; res; res = res->ai_next) {
 714                         char    hname[NI_MAXHOST], sname[NI_MAXSERV];
 715
 716                         ai_unmapped(res);
 717                         if (getnameinfo(res->ai_addr, res->ai_addrlen,
 718                             hname, sizeof(hname), sname, sizeof(sname),
 719                             NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 720                                 strlcpy(hname, "?", sizeof(hname));
 721                                 strlcpy(sname, "?", sizeof(sname));
 722                         }
 723
 724                         if (verbose && res0->ai_next) {
 725                                 fprintf(ttyout, "Trying %s:%s ...\n",
 726                                     hname, sname);
 727                         }
 728
 729                         s = socket(res->ai_family, SOCK_STREAM,
 730                             res->ai_protocol);
 731                         if (s < 0) {
 732                                 warn(
 733                                     "Can't create socket for connection to "
 734                                     "`%s:%s'", hname, sname);
 735                                 continue;
 736                         }
 737
 738                         if (ftp_connect(s, res->ai_addr, res->ai_addrlen) < 0) {
 739                                 close(s);
 740                                 s = -1;
 741                                 continue;
 742                         }
 743
 744                         /* success */
 745                         break;
 746                 }
 747
 748                 if (s < 0) {
 749                         warnx("Can't connect to `%s:%s'", host, port);
 750                         goto cleanup_fetch_url;
 751                 }
 752
 753                 fin = fdopen(s, "r+");
 754                 /*
 755                  * Construct and send the request.
 756                  */
 757                 if (verbose)
 758                         fprintf(ttyout, "Requesting %s\n", url);
 759                 leading = "  (";
 760                 hasleading = 0;
 761                 if (isproxy) {
 762                         if (verbose) {
 763                                 fprintf(ttyout, "%svia %s:%s", leading,
 764                                     host, port);
 765                                 leading = ", ";
 766                                 hasleading++;
 767                         }
 768                         fprintf(fin, "GET %s HTTP/1.0\r\n", path);
 769                         if (flushcache)
 770                                 fprintf(fin, "Pragma: no-cache\r\n");
 771                 } else {
 772                         fprintf(fin, "GET %s HTTP/1.1\r\n", path);
 773                         if (strchr(host, ':')) {
 774                                 char *h, *p;
 775
 776                                 /*
 777                                  * strip off IPv6 scope identifier, since it is
 778                                  * local to the node
 779                                  */
 780                                 h = ftp_strdup(host);
 781                                 if (isipv6addr(h) &&
 782                                     (p = strchr(h, '%')) != NULL) {
 783                                         *p = '\0';
 784                                 }
 785                                 fprintf(fin, "Host: [%s]", h);
 786                                 free(h);
 787                         } else
 788                                 fprintf(fin, "Host: %s", host);
 789                         if (portnum != HTTP_PORT)
 790                                 fprintf(fin, ":%u", portnum);
 791                         fprintf(fin, "\r\n");
 792                         fprintf(fin, "Accept: */*\r\n");
 793                         fprintf(fin, "Connection: close\r\n");
 794                         if (restart_point) {
 795                                 fputs(leading, ttyout);
 796                                 fprintf(fin, "Range: bytes=" LLF "-\r\n",
 797                                     (LLT)restart_point);
 798                                 fprintf(ttyout, "restarting at " LLF,
 799                                     (LLT)restart_point);
 800                                 leading = ", ";
 801                                 hasleading++;
 802                         }
 803                         if (flushcache)
 804                                 fprintf(fin, "Cache-Control: no-cache\r\n");
 805                 }
 806                 if ((useragent=getenv("FTPUSERAGENT")) != NULL) {
 807                         fprintf(fin, "User-Agent: %s\r\n", useragent);
 808                 } else {
 809                         fprintf(fin, "User-Agent: %s/%s\r\n",
 810                             FTP_PRODUCT, FTP_VERSION);
 811                 }
 812                 if (wwwauth) {
 813                         if (verbose) {
 814                                 fprintf(ttyout, "%swith authorization",
 815                                     leading);
 816                                 leading = ", ";
 817                                 hasleading++;
 818                         }
 819                         fprintf(fin, "Authorization: %s\r\n", wwwauth);
 820                 }
 821                 if (proxyauth) {
 822                         if (verbose) {
 823                                 fprintf(ttyout,
 824                                     "%swith proxy authorization", leading);
 825                                 leading = ", ";
 826                                 hasleading++;
 827                         }
 828                         fprintf(fin, "Proxy-Authorization: %s\r\n", proxyauth);
 829                 }
 830                 if (verbose && hasleading)
 831                         fputs(")\n", ttyout);
 832                 fprintf(fin, "\r\n");
 833                 if (fflush(fin) == EOF) {
 834                         warn("Writing HTTP request");
 835                         goto cleanup_fetch_url;
 836                 }
 837
 838                                 /* Read the response */
 839                 len = get_line(fin, buf, sizeof(buf), &errormsg);
 840                 if (len < 0) {
 841                         if (*errormsg == '\n')
 842                                 errormsg++;
 843                         warnx("Receiving HTTP reply: %s", errormsg);
 844                         goto cleanup_fetch_url;
 845                 }
 846                 while (len > 0 && (ISLWS(buf[len-1])))
 847                         buf[--len] = '\0';
 848                 DPRINTF("fetch_url: received `%s'\n", buf);
 849
 850                                 /* Determine HTTP response code */
 851                 cp = strchr(buf, ' ');
 852                 if (cp == NULL)
 853                         goto improper;
 854                 else
 855                         cp++;
 856                 hcode = strtol(cp, &ep, 10);
 857                 if (*ep != '\0' && !isspace((unsigned char)*ep))
 858                         goto improper;
 859                 message = ftp_strdup(cp);
 860
 861                                 /* Read the rest of the header. */
 862                 while (1) {
 863                         len = get_line(fin, buf, sizeof(buf), &errormsg);
 864                         if (len < 0) {
 865                                 if (*errormsg == '\n')
 866                                         errormsg++;
 867                                 warnx("Receiving HTTP reply: %s", errormsg);
 868                                 goto cleanup_fetch_url;
 869                         }
 870                         while (len > 0 && (ISLWS(buf[len-1])))
 871                                 buf[--len] = '\0';
 872                         if (len == 0)
 873                                 break;
 874                         DPRINTF("fetch_url: received `%s'\n", buf);
 875
 876                 /*
 877                  * Look for some headers
 878                  */
 879
 880                         cp = buf;
 881
 882                         if (match_token(&cp, "Content-Length:")) {
 883                                 filesize = STRTOLL(cp, &ep, 10);
 884                                 if (filesize < 0 || *ep != '\0')
 885                                         goto improper;
 886                                 DPRINTF("fetch_url: parsed len as: " LLF "\n",
 887                                     (LLT)filesize);
 888
 889                         } else if (match_token(&cp, "Content-Range:")) {
 890                                 if (! match_token(&cp, "bytes"))
 891                                         goto improper;
 892
 893                                 if (*cp == '*')
 894                                         cp++;
 895                                 else {
 896                                         rangestart = STRTOLL(cp, &ep, 10);
 897                                         if (rangestart < 0 || *ep != '-')
 898                                                 goto improper;
 899                                         cp = ep + 1;
 900                                         rangeend = STRTOLL(cp, &ep, 10);
 901                                         if (rangeend < 0 || rangeend < rangestart)
 902                                                 goto improper;
 903                                         cp = ep;
 904                                 }
 905                                 if (*cp != '/')
 906                                         goto improper;
 907                                 cp++;
 908                                 if (*cp == '*')
 909                                         cp++;
 910                                 else {
 911                                         entitylen = STRTOLL(cp, &ep, 10);
 912                                         if (entitylen < 0)
 913                                                 goto improper;
 914                                         cp = ep;
 915                                 }
 916                                 if (*cp != '\0')
 917                                         goto improper;
 918
 919 #ifndef NO_DEBUG
 920                                 if (ftp_debug) {
 921                                         fprintf(ttyout, "parsed range as: ");
 922                                         if (rangestart == -1)
 923                                                 fprintf(ttyout, "*");
 924                                         else
 925                                                 fprintf(ttyout, LLF "-" LLF,
 926                                                     (LLT)rangestart,
 927                                                     (LLT)rangeend);
 928                                         fprintf(ttyout, "/" LLF "\n", (LLT)entitylen);
 929                                 }
 930 #endif
 931                                 if (! restart_point) {
 932                                         warnx(
 933                                     "Received unexpected Content-Range header");
 934                                         goto cleanup_fetch_url;
 935                                 }
 936
 937                         } else if (match_token(&cp, "Last-Modified:")) {
 938                                 struct tm parsed;
 939                                 const char *t;
 940
 941                                 memset(&parsed, 0, sizeof(parsed));
 942                                 t = parse_rfc2616time(&parsed, cp);
 943                                 if (t != NULL) {
 944                                         parsed.tm_isdst = -1;
 945                                         if (*t == '\0')
 946                                                 mtime = timegm(&parsed);
 947 #ifndef NO_DEBUG
 948                                         if (ftp_debug && mtime != -1) {
 949                                                 fprintf(ttyout,
 950                                                     "parsed time as: %s",
 951                                                 rfc2822time(localtime(&mtime)));
 952                                         }
 953 #endif
 954                                 }
 955
 956                         } else if (match_token(&cp, "Location:")) {
 957                                 location = ftp_strdup(cp);
 958                                 DPRINTF("fetch_url: parsed location as `%s'\n",
 959                                     cp);
 960
 961                         } else if (match_token(&cp, "Transfer-Encoding:")) {
 962                                 if (match_token(&cp, "binary")) {
 963                                         warnx(
 964                         "Bogus transfer encoding `binary' (fetching anyway)");
 965                                         continue;
 966                                 }
 967                                 if (! (token = match_token(&cp, "chunked"))) {
 968                                         warnx(
 969                                     "Unsupported transfer encoding `%s'",
 970                                             token);
 971                                         goto cleanup_fetch_url;
 972                                 }
 973                                 ischunked++;
 974                                 DPRINTF("fetch_url: using chunked encoding\n");
 975
 976                         } else if (match_token(&cp, "Proxy-Authenticate:")
 977                                 || match_token(&cp, "WWW-Authenticate:")) {
 978                                 if (! (token = match_token(&cp, "Basic"))) {
 979                                         DPRINTF(
 980                         "fetch_url: skipping unknown auth scheme `%s'\n",
 981                                                     token);
 982                                         continue;
 983                                 }
 984                                 FREEPTR(auth);
 985                                 auth = ftp_strdup(token);
 986                                 DPRINTF("fetch_url: parsed auth as `%s'\n", cp);
 987                         }
 988
 989                 }
 990                                 /* finished parsing header */
 991
 992                 switch (hcode) {
 993                 case 200:
 994                         break;
 995                 case 206:
 996                         if (! restart_point) {
 997                                 warnx("Not expecting partial content header");
 998                                 goto cleanup_fetch_url;
 999                         }
1000                         break;
1001                 case 300:
1002                 case 301:
1003                 case 302:
1004                 case 303:
1005                 case 305:
1006                 case 307:
1007                         if (EMPTYSTRING(location)) {
1008                                 warnx(
1009                                 "No redirection Location provided by server");
1010                                 goto cleanup_fetch_url;
1011                         }
1012                         if (redirect_loop++ > 5) {
1013                                 warnx("Too many redirections requested");
1014                                 goto cleanup_fetch_url;
1015                         }
1016                         if (hcode == 305) {
1017                                 if (verbose)
1018                                         fprintf(ttyout, "Redirected via %s\n",
1019                                             location);
1020                                 rval = fetch_url(url, location,
1021                                     proxyauth, wwwauth);
1022                         } else {
1023                                 if (verbose)
1024                                         fprintf(ttyout, "Redirected to %s\n",
1025                                             location);
1026                                 rval = go_fetch(location);
1027                         }
1028                         goto cleanup_fetch_url;
1029 #ifndef NO_AUTH
1030                 case 401:
1031                 case 407:
1032                     {
1033                         char **authp;
1034                         char *auser, *apass;
1035
1036                         if (hcode == 401) {
1037                                 authp = &wwwauth;
1038                                 auser = uuser;
1039                                 apass = pass;
1040                         } else {
1041                                 authp = &proxyauth;
1042                                 auser = puser;
1043                                 apass = ppass;
1044                         }
1045                         if (verbose || *authp == NULL ||
1046                             auser == NULL || apass == NULL)
1047                                 fprintf(ttyout, "%s\n", message);
1048                         if (EMPTYSTRING(auth)) {
1049                                 warnx(
1050                             "No authentication challenge provided by server");
1051                                 goto cleanup_fetch_url;
1052                         }
1053                         if (*authp != NULL) {
1054                                 char reply[10];
1055
1056                                 fprintf(ttyout,
1057                                     "Authorization failed. Retry (y/n)? ");
1058                                 if (get_line(stdin, reply, sizeof(reply), NULL)
1059                                     < 0) {
1060                                         goto cleanup_fetch_url;
1061                                 }
1062                                 if (tolower((unsigned char)reply[0]) != 'y')
1063                                         goto cleanup_fetch_url;
1064                                 auser = NULL;
1065                                 apass = NULL;
1066                         }
1067                         if (auth_url(auth, authp, auser, apass) == 0) {
1068                                 rval = fetch_url(url, proxyenv,
1069                                     proxyauth, wwwauth);
1070                                 memset(*authp, 0, strlen(*authp));
1071                                 FREEPTR(*authp);
1072                         }
1073                         goto cleanup_fetch_url;
1074                     }
1075 #endif
1076                 default:
1077                         if (message)
1078                                 warnx("Error retrieving file `%s'", message);
1079                         else
1080                                 warnx("Unknown error retrieving file");
1081                         goto cleanup_fetch_url;
1082                 }
1083         }               /* end of ftp:// or http:// specific setup */
1084
1085                         /* Open the output file. */
1086         if (strcmp(savefile, "-") == 0) {
1087                 fout = stdout;
1088         } else if (*savefile == '|') {
1089                 oldintp = xsignal(SIGPIPE, SIG_IGN);
1090                 fout = popen(savefile + 1, "w");
1091                 if (fout == NULL) {
1092                         warn("Can't execute `%s'", savefile + 1);
1093                         goto cleanup_fetch_url;
1094                 }
1095                 closefunc = pclose;
1096         } else {
1097                 if ((rangeend != -1 && rangeend <= restart_point) ||
1098                     (rangestart == -1 && filesize != -1 && filesize <= restart_point)) {
1099                         /* already done */
1100                         if (verbose)
1101                                 fprintf(ttyout, "already done\n");
1102                         rval = 0;
1103                         goto cleanup_fetch_url;
1104                 }
1105                 if (restart_point && rangestart != -1) {
1106                         if (entitylen != -1)
1107                                 filesize = entitylen;
1108                         if (rangestart != restart_point) {
1109                                 warnx(
1110                                     "Size of `%s' differs from save file `%s'",
1111                                     url, savefile);
1112                                 goto cleanup_fetch_url;
1113                         }
1114                         fout = fopen(savefile, "a");
1115                 } else
1116                         fout = fopen(savefile, "w");
1117                 if (fout == NULL) {
1118                         warn("Can't open `%s'", savefile);
1119                         goto cleanup_fetch_url;
1120                 }
1121                 closefunc = fclose;
1122         }
1123
1124                         /* Trap signals */
1125         if (sigsetjmp(httpabort, 1))
1126                 goto cleanup_fetch_url;
1127         (void)xsignal(SIGQUIT, psummary);
1128         oldintr = xsignal(SIGINT, aborthttp);
1129
1130         assert(rcvbuf_size > 0);
1131         if ((size_t)rcvbuf_size > bufsize) {
1132                 if (xferbuf)
1133                         (void)free(xferbuf);
1134                 bufsize = rcvbuf_size;
1135                 xferbuf = ftp_malloc(bufsize);
1136         }
1137
1138         bytes = 0;
1139         hashbytes = mark;
1140         progressmeter(-1);
1141
1142                         /* Finally, suck down the file. */
1143         do {
1144                 long chunksize;
1145                 short lastchunk;
1146
1147                 chunksize = 0;
1148                 lastchunk = 0;
1149                                         /* read chunk-size */
1150                 if (ischunked) {
1151                         if (fgets(xferbuf, bufsize, fin) == NULL) {
1152                                 warnx("Unexpected EOF reading chunk-size");
1153                                 goto cleanup_fetch_url;
1154                         }
1155                         errno = 0;
1156                         chunksize = strtol(xferbuf, &ep, 16);
1157                         if (ep == xferbuf) {
1158                                 warnx("Invalid chunk-size");
1159                                 goto cleanup_fetch_url;
1160                         }
1161                         if (errno == ERANGE || chunksize < 0) {
1162                                 errno = ERANGE;
1163                                 warn("Chunk-size `%.*s'",
1164                                     (int)(ep-xferbuf), xferbuf);
1165                                 goto cleanup_fetch_url;
1166                         }
1167
1168                                 /*
1169                                  * XXX: Work around bug in Apache 1.3.9 and
1170                                  *      1.3.11, which incorrectly put trailing
1171                                  *      space after the chunk-size.
1172                                  */
1173                         while (*ep == ' ')
1174                                 ep++;
1175
1176                                         /* skip [ chunk-ext ] */
1177                         if (*ep == ';') {
1178                                 while (*ep && *ep != '\r')
1179                                         ep++;
1180                         }
1181
1182                         if (strcmp(ep, "\r\n") != 0) {
1183                                 warnx("Unexpected data following chunk-size");
1184                                 goto cleanup_fetch_url;
1185                         }
1186                         DPRINTF("fetch_url: got chunk-size of " LLF "\n",
1187                             (LLT)chunksize);
1188                         if (chunksize == 0) {
1189                                 lastchunk = 1;
1190                                 goto chunkdone;
1191                         }
1192                 }
1193                                         /* transfer file or chunk */
1194                 while (1) {
1195                         struct timeval then, now, td;
1196                         off_t bufrem;
1197
1198                         if (rate_get)
1199                                 (void)gettimeofday(&then, NULL);
1200                         bufrem = rate_get ? rate_get : (off_t)bufsize;
1201                         if (ischunked)
1202                                 bufrem = MIN(chunksize, bufrem);
1203                         while (bufrem > 0) {
1204                                 flen = fread(xferbuf, sizeof(char),
1205                                     MIN((off_t)bufsize, bufrem), fin);
1206                                 if (flen <= 0)
1207                                         goto chunkdone;
1208                                 bytes += flen;
1209                                 bufrem -= flen;
1210                                 if (fwrite(xferbuf, sizeof(char), flen, fout)
1211                                     != flen) {
1212                                         warn("Writing `%s'", savefile);
1213                                         goto cleanup_fetch_url;
1214                                 }
1215                                 if (hash && !progress) {
1216                                         while (bytes >= hashbytes) {
1217                                                 (void)putc('#', ttyout);
1218                                                 hashbytes += mark;
1219                                         }
1220                                         (void)fflush(ttyout);
1221                                 }
1222                                 if (ischunked) {
1223                                         chunksize -= flen;
1224                                         if (chunksize <= 0)
1225                                                 break;
1226                                 }
1227                         }
1228                         if (rate_get) {
1229                                 while (1) {
1230                                         (void)gettimeofday(&now, NULL);
1231                                         timersub(&now, &then, &td);
1232                                         if (td.tv_sec > 0)
1233                                                 break;
1234                                         usleep(1000000 - td.tv_usec);
1235                                 }
1236                         }
1237                         if (ischunked && chunksize <= 0)
1238                                 break;
1239                 }
1240                                         /* read CRLF after chunk*/
1241  chunkdone:
1242                 if (ischunked) {
1243                         if (fgets(xferbuf, bufsize, fin) == NULL) {
1244                                 warnx("Unexpected EOF reading chunk CRLF");
1245                                 goto cleanup_fetch_url;
1246                         }
1247                         if (strcmp(xferbuf, "\r\n") != 0) {
1248                                 warnx("Unexpected data following chunk");
1249                                 goto cleanup_fetch_url;
1250                         }
1251                         if (lastchunk)
1252                                 break;
1253                 }
1254         } while (ischunked);
1255
1256 /* XXX: deal with optional trailer & CRLF here? */
1257
1258         if (hash && !progress && bytes > 0) {
1259                 if (bytes < mark)
1260                         (void)putc('#', ttyout);
1261                 (void)putc('\n', ttyout);
1262         }
1263         if (ferror(fin)) {
1264                 warn("Reading file");
1265                 goto cleanup_fetch_url;
1266         }
1267         progressmeter(1);
1268         (void)fflush(fout);
1269         if (closefunc == fclose && mtime != -1) {
1270                 struct timeval tval[2];
1271
1272                 (void)gettimeofday(&tval[0], NULL);
1273                 tval[1].tv_sec = mtime;
1274                 tval[1].tv_usec = 0;
1275                 (*closefunc)(fout);
1276                 fout = NULL;
1277
1278                 if (utimes(savefile, tval) == -1) {
1279                         fprintf(ttyout,
1280                             "Can't change modification time to %s",
1281                             rfc2822time(localtime(&mtime)));
1282                 }
1283         }
1284         if (bytes > 0)
1285                 ptransfer(0);
1286         bytes = 0;
1287
1288         rval = 0;
1289         goto cleanup_fetch_url;
1290
1291  improper:
1292         warnx("Improper response from `%s:%s'", host, port);
1293
1294  cleanup_fetch_url:
1295         if (oldintr)
1296                 (void)xsignal(SIGINT, oldintr);
1297         if (oldintp)
1298                 (void)xsignal(SIGPIPE, oldintp);
1299         if (fin != NULL)
1300                 fclose(fin);
1301         else if (s != -1)
1302                 close(s);
1303         if (closefunc != NULL && fout != NULL)
1304                 (*closefunc)(fout);
1305         if (res0)
1306                 freeaddrinfo(res0);
1307         FREEPTR(savefile);
1308         FREEPTR(uuser);
1309         if (pass != NULL)
1310                 memset(pass, 0, strlen(pass));
1311         FREEPTR(pass);
1312         FREEPTR(host);
1313         FREEPTR(port);
1314         FREEPTR(path);
1315         FREEPTR(decodedpath);
1316         FREEPTR(puser);
1317         if (ppass != NULL)
1318                 memset(ppass, 0, strlen(ppass));
1319         FREEPTR(ppass);
1320         FREEPTR(auth);
1321         FREEPTR(location);
1322         FREEPTR(message);
1323         return (rval);
1324 }
1325
1326 /*
1327  * Abort a HTTP retrieval
1328  */
1329 static void
1330 aborthttp(int notused)
1331 {
1332         char msgbuf[100];
1333         size_t len;
1334
1335         sigint_raised = 1;
1336         alarmtimer(0);
1337         len = strlcpy(msgbuf, "\nHTTP fetch aborted.\n", sizeof(msgbuf));
1338         write(fileno(ttyout), msgbuf, len);
1339         siglongjmp(httpabort, 1);
1340 }
1341
1342 /*
1343  * Retrieve ftp URL or classic ftp argument using FTP.
1344  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1345  * is still open (e.g, ftp xfer with trailing /)
1346  */
1347 static int
1348 fetch_ftp(const char *url)
1349 {
1350         char            *cp, *xargv[5], rempath[MAXPATHLEN];
1351         char            *host, *path, *dir, *file, *uuser, *pass;
1352         char            *port;
1353         char             cmdbuf[MAXPATHLEN];
1354         char             dirbuf[4];
1355         int              dirhasglob, filehasglob, rval, transtype, xargc;
1356         int              oanonftp, oautologin;
1357         in_port_t        portnum;
1358         url_t            urltype;
1359
1360         DPRINTF("fetch_ftp: `%s'\n", url);
1361         host = path = dir = file = uuser = pass = NULL;
1362         port = NULL;
1363         rval = 1;
1364         transtype = TYPE_I;
1365
1366         if (STRNEQUAL(url, FTP_URL)) {
1367                 if ((parse_url(url, "URL", &urltype, &uuser, &pass,
1368                     &host, &port, &portnum, &path) == -1) ||
1369                     (uuser != NULL && *uuser == '\0') ||
1370                     EMPTYSTRING(host)) {
1371                         warnx("Invalid URL `%s'", url);
1372                         goto cleanup_fetch_ftp;
1373                 }
1374                 /*
1375                  * Note: Don't url_decode(path) here.  We need to keep the
1376                  * distinction between "/" and "%2F" until later.
1377                  */
1378
1379                                         /* check for trailing ';type=[aid]' */
1380                 if (! EMPTYSTRING(path) && (cp = strrchr(path, ';')) != NULL) {
1381                         if (strcasecmp(cp, ";type=a") == 0)
1382                                 transtype = TYPE_A;
1383                         else if (strcasecmp(cp, ";type=i") == 0)
1384                                 transtype = TYPE_I;
1385                         else if (strcasecmp(cp, ";type=d") == 0) {
1386                                 warnx(
1387                             "Directory listing via a URL is not supported");
1388                                 goto cleanup_fetch_ftp;
1389                         } else {
1390                                 warnx("Invalid suffix `%s' in URL `%s'", cp,
1391                                     url);
1392                                 goto cleanup_fetch_ftp;
1393                         }
1394                         *cp = 0;
1395                 }
1396         } else {                        /* classic style `[user@]host:[file]' */
1397                 urltype = CLASSIC_URL_T;
1398                 host = ftp_strdup(url);
1399                 cp = strchr(host, '@');
1400                 if (cp != NULL) {
1401                         *cp = '\0';
1402                         uuser = host;
1403                         anonftp = 0;    /* disable anonftp */
1404                         host = ftp_strdup(cp + 1);
1405                 }
1406                 cp = strchr(host, ':');
1407                 if (cp != NULL) {
1408                         *cp = '\0';
1409                         path = ftp_strdup(cp + 1);
1410                 }
1411         }
1412         if (EMPTYSTRING(host))
1413                 goto cleanup_fetch_ftp;
1414
1415                         /* Extract the file and (if present) directory name. */
1416         dir = path;
1417         if (! EMPTYSTRING(dir)) {
1418                 /*
1419                  * If we are dealing with classic `[user@]host:[path]' syntax,
1420                  * then a path of the form `/file' (resulting from input of the
1421                  * form `host:/file') means that we should do "CWD /" before
1422                  * retrieving the file.  So we set dir="/" and file="file".
1423                  *
1424                  * But if we are dealing with URLs like `ftp://host/path' then
1425                  * a path of the form `/file' (resulting from a URL of the form
1426                  * `ftp://host//file') means that we should do `CWD ' (with an
1427                  * empty argument) before retrieving the file.  So we set
1428                  * dir="" and file="file".
1429                  *
1430                  * If the path does not contain / at all, we set dir=NULL.
1431                  * (We get a path without any slashes if we are dealing with
1432                  * classic `[user@]host:[file]' or URL `ftp://host/file'.)
1433                  *
1434                  * In all other cases, we set dir to a string that does not
1435                  * include the final '/' that separates the dir part from the
1436                  * file part of the path.  (This will be the empty string if
1437                  * and only if we are dealing with a path of the form `/file'
1438                  * resulting from an URL of the form `ftp://host//file'.)
1439                  */
1440                 cp = strrchr(dir, '/');
1441                 if (cp == dir && urltype == CLASSIC_URL_T) {
1442                         file = cp + 1;
1443                         (void)strlcpy(dirbuf, "/", sizeof(dirbuf));
1444                         dir = dirbuf;
1445                 } else if (cp != NULL) {
1446                         *cp++ = '\0';
1447                         file = cp;
1448                 } else {
1449                         file = dir;
1450                         dir = NULL;
1451                 }
1452         } else
1453                 dir = NULL;
1454         if (urltype == FTP_URL_T && file != NULL) {
1455                 url_decode(file);
1456                 /* but still don't url_decode(dir) */
1457         }
1458         DPRINTF("fetch_ftp: user `%s' pass `%s' host %s port %s "
1459             "path `%s' dir `%s' file `%s'\n",
1460             STRorNULL(uuser), STRorNULL(pass),
1461             STRorNULL(host), STRorNULL(port),
1462             STRorNULL(path), STRorNULL(dir), STRorNULL(file));
1463
1464         dirhasglob = filehasglob = 0;
1465         if (doglob && urltype == CLASSIC_URL_T) {
1466                 if (! EMPTYSTRING(dir) && strpbrk(dir, "*?[]{}") != NULL)
1467                         dirhasglob = 1;
1468                 if (! EMPTYSTRING(file) && strpbrk(file, "*?[]{}") != NULL)
1469                         filehasglob = 1;
1470         }
1471
1472                         /* Set up the connection */
1473         oanonftp = anonftp;
1474         if (connected)
1475                 disconnect(0, NULL);
1476         anonftp = oanonftp;
1477         (void)strlcpy(cmdbuf, getprogname(), sizeof(cmdbuf));
1478         xargv[0] = cmdbuf;
1479         xargv[1] = host;
1480         xargv[2] = NULL;
1481         xargc = 2;
1482         if (port) {
1483                 xargv[2] = port;
1484                 xargv[3] = NULL;
1485                 xargc = 3;
1486         }
1487         oautologin = autologin;
1488                 /* don't autologin in setpeer(), use ftp_login() below */
1489         autologin = 0;
1490         setpeer(xargc, xargv);
1491         autologin = oautologin;
1492         if ((connected == 0) ||
1493             (connected == 1 && !ftp_login(host, uuser, pass))) {
1494                 warnx("Can't connect or login to host `%s:%s'",
1495                         host, port ? port : "?");
1496                 goto cleanup_fetch_ftp;
1497         }
1498
1499         switch (transtype) {
1500         case TYPE_A:
1501                 setascii(1, xargv);
1502                 break;
1503         case TYPE_I:
1504                 setbinary(1, xargv);
1505                 break;
1506         default:
1507                 errx(1, "fetch_ftp: unknown transfer type %d", transtype);
1508         }
1509
1510                 /*
1511                  * Change directories, if necessary.
1512                  *
1513                  * Note: don't use EMPTYSTRING(dir) below, because
1514                  * dir=="" means something different from dir==NULL.
1515                  */
1516         if (dir != NULL && !dirhasglob) {
1517                 char *nextpart;
1518
1519                 /*
1520                  * If we are dealing with a classic `[user@]host:[path]'
1521                  * (urltype is CLASSIC_URL_T) then we have a raw directory
1522                  * name (not encoded in any way) and we can change
1523                  * directories in one step.
1524                  *
1525                  * If we are dealing with an `ftp://host/path' URL
1526                  * (urltype is FTP_URL_T), then RFC 3986 says we need to
1527                  * send a separate CWD command for each unescaped "/"
1528                  * in the path, and we have to interpret %hex escaping
1529                  * *after* we find the slashes.  It's possible to get
1530                  * empty components here, (from multiple adjacent
1531                  * slashes in the path) and RFC 3986 says that we should
1532                  * still do `CWD ' (with a null argument) in such cases.
1533                  *
1534                  * Many ftp servers don't support `CWD ', so if there's an
1535                  * error performing that command, bail out with a descriptive
1536                  * message.
1537                  *
1538                  * Examples:
1539                  *
1540                  * host:                        dir="", urltype=CLASSIC_URL_T
1541                  *              logged in (to default directory)
1542                  * host:file                    dir=NULL, urltype=CLASSIC_URL_T
1543                  *              "RETR file"
1544                  * host:dir/                    dir="dir", urltype=CLASSIC_URL_T
1545                  *              "CWD dir", logged in
1546                  * ftp://host/                  dir="", urltype=FTP_URL_T
1547                  *              logged in (to default directory)
1548                  * ftp://host/dir/              dir="dir", urltype=FTP_URL_T
1549                  *              "CWD dir", logged in
1550                  * ftp://host/file              dir=NULL, urltype=FTP_URL_T
1551                  *              "RETR file"
1552                  * ftp://host//file             dir="", urltype=FTP_URL_T
1553                  *              "CWD ", "RETR file"
1554                  * host:/file                   dir="/", urltype=CLASSIC_URL_T
1555                  *              "CWD /", "RETR file"
1556                  * ftp://host///file            dir="/", urltype=FTP_URL_T
1557                  *              "CWD ", "CWD ", "RETR file"
1558                  * ftp://host/%2F/file          dir="%2F", urltype=FTP_URL_T
1559                  *              "CWD /", "RETR file"
1560                  * ftp://host/foo/file          dir="foo", urltype=FTP_URL_T
1561                  *              "CWD foo", "RETR file"
1562                  * ftp://host/foo/bar/file      dir="foo/bar"
1563                  *              "CWD foo", "CWD bar", "RETR file"
1564                  * ftp://host//foo/bar/file     dir="/foo/bar"
1565                  *              "CWD ", "CWD foo", "CWD bar", "RETR file"
1566                  * ftp://host/foo//bar/file     dir="foo//bar"
1567                  *              "CWD foo", "CWD ", "CWD bar", "RETR file"
1568                  * ftp://host/%2F/foo/bar/file  dir="%2F/foo/bar"
1569                  *              "CWD /", "CWD foo", "CWD bar", "RETR file"
1570                  * ftp://host/%2Ffoo/bar/file   dir="%2Ffoo/bar"
1571                  *              "CWD /foo", "CWD bar", "RETR file"
1572                  * ftp://host/%2Ffoo%2Fbar/file dir="%2Ffoo%2Fbar"
1573                  *              "CWD /foo/bar", "RETR file"
1574                  * ftp://host/%2Ffoo%2Fbar%2Ffile       dir=NULL
1575                  *              "RETR /foo/bar/file"
1576                  *
1577                  * Note that we don't need `dir' after this point.
1578                  */
1579                 do {
1580                         if (urltype == FTP_URL_T) {
1581                                 nextpart = strchr(dir, '/');
1582                                 if (nextpart) {
1583                                         *nextpart = '\0';
1584                                         nextpart++;
1585                                 }
1586                                 url_decode(dir);
1587                         } else
1588                                 nextpart = NULL;
1589                         DPRINTF("fetch_ftp: dir `%s', nextpart `%s'\n",
1590                             STRorNULL(dir), STRorNULL(nextpart));
1591                         if (urltype == FTP_URL_T || *dir != '\0') {
1592                                 (void)strlcpy(cmdbuf, "cd", sizeof(cmdbuf));
1593                                 xargv[0] = cmdbuf;
1594                                 xargv[1] = dir;
1595                                 xargv[2] = NULL;
1596                                 dirchange = 0;
1597                                 cd(2, xargv);
1598                                 if (! dirchange) {
1599                                         if (*dir == '\0' && code == 500)
1600                                                 fprintf(stderr,
1601 "\n"
1602 "ftp: The `CWD ' command (without a directory), which is required by\n"
1603 "     RFC 3986 to support the empty directory in the URL pathname (`//'),\n"
1604 "     conflicts with the server's conformance to RFC 959.\n"
1605 "     Try the same URL without the `//' in the URL pathname.\n"
1606 "\n");
1607                                         goto cleanup_fetch_ftp;
1608                                 }
1609                         }
1610                         dir = nextpart;
1611                 } while (dir != NULL);
1612         }
1613
1614         if (EMPTYSTRING(file)) {
1615                 rval = -1;
1616                 goto cleanup_fetch_ftp;
1617         }
1618
1619         if (dirhasglob) {
1620                 (void)strlcpy(rempath, dir,     sizeof(rempath));
1621                 (void)strlcat(rempath, "/",     sizeof(rempath));
1622                 (void)strlcat(rempath, file,    sizeof(rempath));
1623                 file = rempath;
1624         }
1625
1626                         /* Fetch the file(s). */
1627         xargc = 2;
1628         (void)strlcpy(cmdbuf, "get", sizeof(cmdbuf));
1629         xargv[0] = cmdbuf;
1630         xargv[1] = file;
1631         xargv[2] = NULL;
1632         if (dirhasglob || filehasglob) {
1633                 int ointeractive;
1634
1635                 ointeractive = interactive;
1636                 interactive = 0;
1637                 if (restartautofetch)
1638                         (void)strlcpy(cmdbuf, "mreget", sizeof(cmdbuf));
1639                 else
1640                         (void)strlcpy(cmdbuf, "mget", sizeof(cmdbuf));
1641                 xargv[0] = cmdbuf;
1642                 mget(xargc, xargv);
1643                 interactive = ointeractive;
1644         } else {
1645                 if (outfile == NULL) {
1646                         cp = strrchr(file, '/');        /* find savefile */
1647                         if (cp != NULL)
1648                                 outfile = cp + 1;
1649                         else
1650                                 outfile = file;
1651                 }
1652                 xargv[2] = (char *)outfile;
1653                 xargv[3] = NULL;
1654                 xargc++;
1655                 if (restartautofetch)
1656                         reget(xargc, xargv);
1657                 else
1658                         get(xargc, xargv);
1659         }
1660
1661         if ((code / 100) == COMPLETE)
1662                 rval = 0;
1663
1664  cleanup_fetch_ftp:
1665         FREEPTR(port);
1666         FREEPTR(host);
1667         FREEPTR(path);
1668         FREEPTR(uuser);
1669         if (pass)
1670                 memset(pass, 0, strlen(pass));
1671         FREEPTR(pass);
1672         return (rval);
1673 }
1674
1675 /*
1676  * Retrieve the given file to outfile.
1677  * Supports arguments of the form:
1678  *      "host:path", "ftp://host/path"  if $ftpproxy, call fetch_url() else
1679  *                                      call fetch_ftp()
1680  *      "http://host/path"              call fetch_url() to use HTTP
1681  *      "file:///path"                  call fetch_url() to copy
1682  *      "about:..."                     print a message
1683  *
1684  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1685  * is still open (e.g, ftp xfer with trailing /)
1686  */
1687 static int
1688 go_fetch(const char *url)
1689 {
1690         char *proxyenv;
1691
1692 #ifndef NO_ABOUT
1693         /*
1694          * Check for about:*
1695          */
1696         if (STRNEQUAL(url, ABOUT_URL)) {
1697                 url += sizeof(ABOUT_URL) -1;
1698                 if (strcasecmp(url, "ftp") == 0 ||
1699                     strcasecmp(url, "tnftp") == 0) {
1700                         fputs(
1701 "This version of ftp has been enhanced by Luke Mewburn <lukem@NetBSD.org>\n"
1702 "for the NetBSD project.  Execute `man ftp' for more details.\n", ttyout);
1703                 } else if (strcasecmp(url, "lukem") == 0) {
1704                         fputs(
1705 "Luke Mewburn is the author of most of the enhancements in this ftp client.\n"
1706 "Please email feedback to <lukem@NetBSD.org>.\n", ttyout);
1707                 } else if (strcasecmp(url, "netbsd") == 0) {
1708                         fputs(
1709 "NetBSD is a freely available and redistributable UNIX-like operating system.\n"
1710 "For more information, see http://www.NetBSD.org/\n", ttyout);
1711                 } else if (strcasecmp(url, "version") == 0) {
1712                         fprintf(ttyout, "Version: %s %s%s\n",
1713                             FTP_PRODUCT, FTP_VERSION,
1714 #ifdef INET6
1715                             ""
1716 #else
1717                             " (-IPv6)"
1718 #endif
1719                         );
1720                 } else {
1721                         fprintf(ttyout, "`%s' is an interesting topic.\n", url);
1722                 }
1723                 fputs("\n", ttyout);
1724                 return (0);
1725         }
1726 #endif
1727
1728         /*
1729          * Check for file:// and http:// URLs.
1730          */
1731         if (STRNEQUAL(url, HTTP_URL) || STRNEQUAL(url, FILE_URL))
1732                 return (fetch_url(url, NULL, NULL, NULL));
1733
1734         /*
1735          * Try FTP URL-style and host:file arguments next.
1736          * If ftpproxy is set with an FTP URL, use fetch_url()
1737          * Othewise, use fetch_ftp().
1738          */
1739         proxyenv = getoptionvalue("ftp_proxy");
1740         if (!EMPTYSTRING(proxyenv) && STRNEQUAL(url, FTP_URL))
1741                 return (fetch_url(url, NULL, NULL, NULL));
1742
1743         return (fetch_ftp(url));
1744 }
1745
1746 /*
1747  * Retrieve multiple files from the command line,
1748  * calling go_fetch() for each file.
1749  *
1750  * If an ftp path has a trailing "/", the path will be cd-ed into and
1751  * the connection remains open, and the function will return -1
1752  * (to indicate the connection is alive).
1753  * If an error occurs the return value will be the offset+1 in
1754  * argv[] of the file that caused a problem (i.e, argv[x]
1755  * returns x+1)
1756  * Otherwise, 0 is returned if all files retrieved successfully.
1757  */
1758 int
1759 auto_fetch(int argc, char *argv[])
1760 {
1761         volatile int    argpos, rval;
1762
1763         argpos = rval = 0;
1764
1765         if (sigsetjmp(toplevel, 1)) {
1766                 if (connected)
1767                         disconnect(0, NULL);
1768                 if (rval > 0)
1769                         rval = argpos + 1;
1770                 return (rval);
1771         }
1772         (void)xsignal(SIGINT, intr);
1773         (void)xsignal(SIGPIPE, lostpeer);
1774
1775         /*
1776          * Loop through as long as there's files to fetch.
1777          */
1778         for (; (rval == 0) && (argpos < argc); argpos++) {
1779                 if (strchr(argv[argpos], ':') == NULL)
1780                         break;
1781                 redirect_loop = 0;
1782                 if (!anonftp)
1783                         anonftp = 2;    /* Handle "automatic" transfers. */
1784                 rval = go_fetch(argv[argpos]);
1785                 if (outfile != NULL && strcmp(outfile, "-") != 0
1786                     && outfile[0] != '|')
1787                         outfile = NULL;
1788                 if (rval > 0)
1789                         rval = argpos + 1;
1790         }
1791
1792         if (connected && rval != -1)
1793                 disconnect(0, NULL);
1794         return (rval);
1795 }
1796
1797
1798 /*
1799  * Upload multiple files from the command line.
1800  *
1801  * If an error occurs the return value will be the offset+1 in
1802  * argv[] of the file that caused a problem (i.e, argv[x]
1803  * returns x+1)
1804  * Otherwise, 0 is returned if all files uploaded successfully.
1805  */
1806 int
1807 auto_put(int argc, char **argv, const char *uploadserver)
1808 {
1809         char    *uargv[4], *path, *pathsep;
1810         int      uargc, rval, argpos;
1811         size_t   len;
1812         char     cmdbuf[MAX_C_NAME];
1813
1814         (void)strlcpy(cmdbuf, "mput", sizeof(cmdbuf));
1815         uargv[0] = cmdbuf;
1816         uargv[1] = argv[0];
1817         uargc = 2;
1818         uargv[2] = uargv[3] = NULL;
1819         pathsep = NULL;
1820         rval = 1;
1821
1822         DPRINTF("auto_put: target `%s'\n", uploadserver);
1823
1824         path = ftp_strdup(uploadserver);
1825         len = strlen(path);
1826         if (path[len - 1] != '/' && path[len - 1] != ':') {
1827                         /*
1828                          * make sure we always pass a directory to auto_fetch
1829                          */
1830                 if (argc > 1) {         /* more than one file to upload */
1831                         len = strlen(uploadserver) + 2; /* path + "/" + "\0" */
1832                         free(path);
1833                         path = (char *)ftp_malloc(len);
1834                         (void)strlcpy(path, uploadserver, len);
1835                         (void)strlcat(path, "/", len);
1836                 } else {                /* single file to upload */
1837                         (void)strlcpy(cmdbuf, "put", sizeof(cmdbuf));
1838                         uargv[0] = cmdbuf;
1839                         pathsep = strrchr(path, '/');
1840                         if (pathsep == NULL) {
1841                                 pathsep = strrchr(path, ':');
1842                                 if (pathsep == NULL) {
1843                                         warnx("Invalid URL `%s'", path);
1844                                         goto cleanup_auto_put;
1845                                 }
1846                                 pathsep++;
1847                                 uargv[2] = ftp_strdup(pathsep);
1848                                 pathsep[0] = '/';
1849                         } else
1850                                 uargv[2] = ftp_strdup(pathsep + 1);
1851                         pathsep[1] = '\0';
1852                         uargc++;
1853                 }
1854         }
1855         DPRINTF("auto_put: URL `%s' argv[2] `%s'\n",
1856             path, STRorNULL(uargv[2]));
1857
1858                         /* connect and cwd */
1859         rval = auto_fetch(1, &path);
1860         if(rval >= 0)
1861                 goto cleanup_auto_put;
1862
1863         rval = 0;
1864
1865                         /* target filename provided; upload 1 file */
1866                         /* XXX : is this the best way? */
1867         if (uargc == 3) {
1868                 uargv[1] = argv[0];
1869                 put(uargc, uargv);
1870                 if ((code / 100) != COMPLETE)
1871                         rval = 1;
1872         } else {        /* otherwise a target dir: upload all files to it */
1873                 for(argpos = 0; argv[argpos] != NULL; argpos++) {
1874                         uargv[1] = argv[argpos];
1875                         mput(uargc, uargv);
1876                         if ((code / 100) != COMPLETE) {
1877                                 rval = argpos + 1;
1878                                 break;
1879                         }
1880                 }
1881         }
1882
1883  cleanup_auto_put:
1884         free(path);
1885         FREEPTR(uargv[2]);
1886         return (rval);
1887 }