contrib/tnftp/fetch.c

   1 /*      $NetBSD: fetch.c,v 1.193 2010/03/05 07:41:10 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 1.193 2010/03/05 07:41:10 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 <ctype.h>
  56 #include <err.h>
  57 #include <errno.h>
  58 #include <netdb.h>
  59 #include <fcntl.h>
  60 #include <stdio.h>
  61 #include <libutil.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65 #include <time.h>
  66
  67 #include "ftp_var.h"
  68 #include "version.h"
  69
  70 typedef enum {
  71         UNKNOWN_URL_T=-1,
  72         HTTP_URL_T,
  73         FTP_URL_T,
  74         FILE_URL_T,
  75         CLASSIC_URL_T
  76 } url_t;
  77
  78 void            aborthttp(int);
  79 #ifndef NO_AUTH
  80 static int      auth_url(const char *, char **, const char *, const char *);
  81 static void     base64_encode(const unsigned char *, size_t, unsigned char *);
  82 #endif
  83 static int      go_fetch(const char *);
  84 static int      fetch_ftp(const char *);
  85 static int      fetch_url(const char *, const char *, char *, char *);
  86 static const char *match_token(const char **, const char *);
  87 static int      parse_url(const char *, const char *, url_t *, char **,
  88                             char **, char **, char **, in_port_t *, char **);
  89 static void     url_decode(char *);
  90
  91 static int      redirect_loop;
  92
  93
  94 #define STRNEQUAL(a,b)  (strncasecmp((a), (b), sizeof((b))-1) == 0)
  95 #define ISLWS(x)        ((x)=='\r' || (x)=='\n' || (x)==' ' || (x)=='\t')
  96 #define SKIPLWS(x)      do { while (ISLWS((*x))) x++; } while (0)
  97
  98
  99 #define ABOUT_URL       "about:"        /* propaganda */
 100 #define FILE_URL        "file://"       /* file URL prefix */
 101 #define FTP_URL         "ftp://"        /* ftp URL prefix */
 102 #define HTTP_URL        "http://"       /* http URL prefix */
 103
 104
 105 /*
 106  * Determine if token is the next word in buf (case insensitive).
 107  * If so, advance buf past the token and any trailing LWS, and
 108  * return a pointer to the token (in buf).  Otherwise, return NULL.
 109  * token may be preceded by LWS.
 110  * token must be followed by LWS or NUL.  (I.e, don't partial match).
 111  */
 112 static const char *
 113 match_token(const char **buf, const char *token)
 114 {
 115         const char      *p, *orig;
 116         size_t          tlen;
 117
 118         tlen = strlen(token);
 119         p = *buf;
 120         SKIPLWS(p);
 121         orig = p;
 122         if (strncasecmp(p, token, tlen) != 0)
 123                 return NULL;
 124         p += tlen;
 125         if (*p != '\0' && !ISLWS(*p))
 126                 return NULL;
 127         SKIPLWS(p);
 128         orig = *buf;
 129         *buf = p;
 130         return orig;
 131 }
 132
 133 #ifndef NO_AUTH
 134 /*
 135  * Generate authorization response based on given authentication challenge.
 136  * Returns -1 if an error occurred, otherwise 0.
 137  * Sets response to a malloc(3)ed string; caller should free.
 138  */
 139 static int
 140 auth_url(const char *challenge, char **response, const char *guser,
 141         const char *gpass)
 142 {
 143         const char      *cp, *scheme, *errormsg;
 144         char            *ep, *clear, *realm;
 145         char             uuser[BUFSIZ], *gotpass;
 146         const char      *upass;
 147         int              rval;
 148         size_t           len, clen, rlen;
 149
 150         *response = NULL;
 151         clear = realm = NULL;
 152         rval = -1;
 153         cp = challenge;
 154         scheme = "Basic";       /* only support Basic authentication */
 155         gotpass = NULL;
 156
 157         DPRINTF("auth_url: challenge `%s'\n", challenge);
 158
 159         if (! match_token(&cp, scheme)) {
 160                 warnx("Unsupported authentication challenge `%s'",
 161                     challenge);
 162                 goto cleanup_auth_url;
 163         }
 164
 165 #define REALM "realm=\""
 166         if (STRNEQUAL(cp, REALM))
 167                 cp += sizeof(REALM) - 1;
 168         else {
 169                 warnx("Unsupported authentication challenge `%s'",
 170                     challenge);
 171                 goto cleanup_auth_url;
 172         }
 173 /* XXX: need to improve quoted-string parsing to support \ quoting, etc. */
 174         if ((ep = strchr(cp, '\"')) != NULL) {
 175                 len = ep - cp;
 176                 realm = (char *)ftp_malloc(len + 1);
 177                 (void)strlcpy(realm, cp, len + 1);
 178         } else {
 179                 warnx("Unsupported authentication challenge `%s'",
 180                     challenge);
 181                 goto cleanup_auth_url;
 182         }
 183
 184         fprintf(ttyout, "Username for `%s': ", realm);
 185         if (guser != NULL) {
 186                 (void)strlcpy(uuser, guser, sizeof(uuser));
 187                 fprintf(ttyout, "%s\n", uuser);
 188         } else {
 189                 (void)fflush(ttyout);
 190                 if (get_line(stdin, uuser, sizeof(uuser), &errormsg) < 0) {
 191                         warnx("%s; can't authenticate", errormsg);
 192                         goto cleanup_auth_url;
 193                 }
 194         }
 195         if (gpass != NULL)
 196                 upass = gpass;
 197         else {
 198                 gotpass = getpass("Password: ");
 199                 if (gotpass == NULL) {
 200                         warnx("Can't read password");
 201                         goto cleanup_auth_url;
 202                 }
 203                 upass = gotpass;
 204         }
 205
 206         clen = strlen(uuser) + strlen(upass) + 2;       /* user + ":" + pass + "\0" */
 207         clear = (char *)ftp_malloc(clen);
 208         (void)strlcpy(clear, uuser, clen);
 209         (void)strlcat(clear, ":", clen);
 210         (void)strlcat(clear, upass, clen);
 211         if (gotpass)
 212                 memset(gotpass, 0, strlen(gotpass));
 213
 214                                                 /* scheme + " " + enc + "\0" */
 215         rlen = strlen(scheme) + 1 + (clen + 2) * 4 / 3 + 1;
 216         *response = (char *)ftp_malloc(rlen);
 217         (void)strlcpy(*response, scheme, rlen);
 218         len = strlcat(*response, " ", rlen);
 219                         /* use  `clen - 1'  to not encode the trailing NUL */
 220         base64_encode((unsigned char *)clear, clen - 1,
 221             (unsigned char *)*response + len);
 222         memset(clear, 0, clen);
 223         rval = 0;
 224
 225  cleanup_auth_url:
 226         FREEPTR(clear);
 227         FREEPTR(realm);
 228         return (rval);
 229 }
 230
 231 /*
 232  * Encode len bytes starting at clear using base64 encoding into encoded,
 233  * which should be at least ((len + 2) * 4 / 3 + 1) in size.
 234  */
 235 static void
 236 base64_encode(const unsigned char *clear, size_t len, unsigned char *encoded)
 237 {
 238         static const unsigned char enc[] =
 239             "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 240         unsigned char   *cp;
 241         size_t   i;
 242
 243         cp = encoded;
 244         for (i = 0; i < len; i += 3) {
 245                 *(cp++) = enc[((clear[i + 0] >> 2))];
 246                 *(cp++) = enc[((clear[i + 0] << 4) & 0x30)
 247                             | ((clear[i + 1] >> 4) & 0x0f)];
 248                 *(cp++) = enc[((clear[i + 1] << 2) & 0x3c)
 249                             | ((clear[i + 2] >> 6) & 0x03)];
 250                 *(cp++) = enc[((clear[i + 2]     ) & 0x3f)];
 251         }
 252         *cp = '\0';
 253         while (i-- > len)
 254                 *(--cp) = '=';
 255 }
 256 #endif
 257
 258 /*
 259  * Decode %xx escapes in given string, `in-place'.
 260  */
 261 static void
 262 url_decode(char *url)
 263 {
 264         unsigned char *p, *q;
 265
 266         if (EMPTYSTRING(url))
 267                 return;
 268         p = q = (unsigned char *)url;
 269
 270 #define HEXTOINT(x) (x - (isdigit(x) ? '0' : (islower(x) ? 'a' : 'A') - 10))
 271         while (*p) {
 272                 if (p[0] == '%'
 273                     && p[1] && isxdigit((unsigned char)p[1])
 274                     && p[2] && isxdigit((unsigned char)p[2])) {
 275                         *q++ = HEXTOINT(p[1]) * 16 + HEXTOINT(p[2]);
 276                         p+=3;
 277                 } else
 278                         *q++ = *p++;
 279         }
 280         *q = '\0';
 281 }
 282
 283
 284 /*
 285  * Parse URL of form (per RFC 3986):
 286  *      <type>://[<user>[:<password>]@]<host>[:<port>][/<path>]
 287  * Returns -1 if a parse error occurred, otherwise 0.
 288  * It's the caller's responsibility to url_decode() the returned
 289  * user, pass and path.
 290  *
 291  * Sets type to url_t, each of the given char ** pointers to a
 292  * malloc(3)ed strings of the relevant section, and port to
 293  * the number given, or ftpport if ftp://, or httpport if http://.
 294  *
 295  * XXX: this is not totally RFC 3986 compliant; <path> will have the
 296  * leading `/' unless it's an ftp:// URL, as this makes things easier
 297  * for file:// and http:// URLs.  ftp:// URLs have the `/' between the
 298  * host and the URL-path removed, but any additional leading slashes
 299  * in the URL-path are retained (because they imply that we should
 300  * later do "CWD" with a null argument).
 301  *
 302  * Examples:
 303  *       input URL                       output path
 304  *       ---------                       -----------
 305  *      "http://host"                   "/"
 306  *      "http://host/"                  "/"
 307  *      "http://host/path"              "/path"
 308  *      "file://host/dir/file"          "dir/file"
 309  *      "ftp://host"                    ""
 310  *      "ftp://host/"                   ""
 311  *      "ftp://host//"                  "/"
 312  *      "ftp://host/dir/file"           "dir/file"
 313  *      "ftp://host//dir/file"          "/dir/file"
 314  */
 315 static int
 316 parse_url(const char *url, const char *desc, url_t *utype,
 317                 char **uuser, char **pass, char **host, char **port,
 318                 in_port_t *portnum, char **path)
 319 {
 320         const char      *origurl, *tport;
 321         char            *cp, *ep, *thost;
 322         size_t           len;
 323
 324         if (url == NULL || desc == NULL || utype == NULL || uuser == NULL
 325             || pass == NULL || host == NULL || port == NULL || portnum == NULL
 326             || path == NULL)
 327                 errx(1, "parse_url: invoked with NULL argument!");
 328         DPRINTF("parse_url: %s `%s'\n", desc, url);
 329
 330         origurl = url;
 331         *utype = UNKNOWN_URL_T;
 332         *uuser = *pass = *host = *port = *path = NULL;
 333         *portnum = 0;
 334         tport = NULL;
 335
 336         if (STRNEQUAL(url, HTTP_URL)) {
 337                 url += sizeof(HTTP_URL) - 1;
 338                 *utype = HTTP_URL_T;
 339                 *portnum = HTTP_PORT;
 340                 tport = httpport;
 341         } else if (STRNEQUAL(url, FTP_URL)) {
 342                 url += sizeof(FTP_URL) - 1;
 343                 *utype = FTP_URL_T;
 344                 *portnum = FTP_PORT;
 345                 tport = ftpport;
 346         } else if (STRNEQUAL(url, FILE_URL)) {
 347                 url += sizeof(FILE_URL) - 1;
 348                 *utype = FILE_URL_T;
 349         } else {
 350                 warnx("Invalid %s `%s'", desc, url);
 351  cleanup_parse_url:
 352                 FREEPTR(*uuser);
 353                 if (*pass != NULL)
 354                         memset(*pass, 0, strlen(*pass));
 355                 FREEPTR(*pass);
 356                 FREEPTR(*host);
 357                 FREEPTR(*port);
 358                 FREEPTR(*path);
 359                 return (-1);
 360         }
 361
 362         if (*url == '\0')
 363                 return (0);
 364
 365                         /* find [user[:pass]@]host[:port] */
 366         ep = strchr(url, '/');
 367         if (ep == NULL)
 368                 thost = ftp_strdup(url);
 369         else {
 370                 len = ep - url;
 371                 thost = (char *)ftp_malloc(len + 1);
 372                 (void)strlcpy(thost, url, len + 1);
 373                 if (*utype == FTP_URL_T)        /* skip first / for ftp URLs */
 374                         ep++;
 375                 *path = ftp_strdup(ep);
 376         }
 377
 378         cp = strchr(thost, '@');        /* look for user[:pass]@ in URLs */
 379         if (cp != NULL) {
 380                 if (*utype == FTP_URL_T)
 381                         anonftp = 0;    /* disable anonftp */
 382                 *uuser = thost;
 383                 *cp = '\0';
 384                 thost = ftp_strdup(cp + 1);
 385                 cp = strchr(*uuser, ':');
 386                 if (cp != NULL) {
 387                         *cp = '\0';
 388                         *pass = ftp_strdup(cp + 1);
 389                 }
 390                 url_decode(*uuser);
 391                 if (*pass)
 392                         url_decode(*pass);
 393         }
 394
 395 #ifdef INET6
 396                         /*
 397                          * Check if thost is an encoded IPv6 address, as per
 398                          * RFC 3986:
 399                          *      `[' ipv6-address ']'
 400                          */
 401         if (*thost == '[') {
 402                 cp = thost + 1;
 403                 if ((ep = strchr(cp, ']')) == NULL ||
 404                     (ep[1] != '\0' && ep[1] != ':')) {
 405                         warnx("Invalid address `%s' in %s `%s'",
 406                             thost, desc, origurl);
 407                         goto cleanup_parse_url;
 408                 }
 409                 len = ep - cp;          /* change `[xyz]' -> `xyz' */
 410                 memmove(thost, thost + 1, len);
 411                 thost[len] = '\0';
 412                 if (! isipv6addr(thost)) {
 413                         warnx("Invalid IPv6 address `%s' in %s `%s'",
 414                             thost, desc, origurl);
 415                         goto cleanup_parse_url;
 416                 }
 417                 cp = ep + 1;
 418                 if (*cp == ':')
 419                         cp++;
 420                 else
 421                         cp = NULL;
 422         } else
 423 #endif /* INET6 */
 424                 if ((cp = strchr(thost, ':')) != NULL)
 425                         *cp++ = '\0';
 426         *host = thost;
 427
 428                         /* look for [:port] */
 429         if (cp != NULL) {
 430                 unsigned long   nport;
 431
 432                 nport = strtoul(cp, &ep, 10);
 433                 if (*cp == '\0' || *ep != '\0' ||
 434                     nport < 1 || nport > MAX_IN_PORT_T) {
 435                         warnx("Unknown port `%s' in %s `%s'",
 436                             cp, desc, origurl);
 437                         goto cleanup_parse_url;
 438                 }
 439                 *portnum = nport;
 440                 tport = cp;
 441         }
 442
 443         if (tport != NULL)
 444                 *port = ftp_strdup(tport);
 445         if (*path == NULL) {
 446                 const char *emptypath = "/";
 447                 if (*utype == FTP_URL_T)        /* skip first / for ftp URLs */
 448                         emptypath++;
 449                 *path = ftp_strdup(emptypath);
 450         }
 451
 452         DPRINTF("parse_url: user `%s' pass `%s' host %s port %s(%d) "
 453             "path `%s'\n",
 454             STRorNULL(*uuser), STRorNULL(*pass),
 455             STRorNULL(*host), STRorNULL(*port),
 456             *portnum ? *portnum : -1, STRorNULL(*path));
 457
 458         return (0);
 459 }
 460
 461 sigjmp_buf      httpabort;
 462
 463 /*
 464  * Retrieve URL, via a proxy if necessary, using HTTP.
 465  * If proxyenv is set, use that for the proxy, otherwise try ftp_proxy or
 466  * http_proxy as appropriate.
 467  * Supports HTTP redirects.
 468  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
 469  * is still open (e.g, ftp xfer with trailing /)
 470  */
 471 static int
 472 fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth)
 473 {
 474         struct addrinfo         hints, *res, *res0 = NULL;
 475         int                     error;
 476         sigfunc volatile        oldintr;
 477         sigfunc volatile        oldintp;
 478         int volatile            s;
 479         struct stat             sb;
 480         int volatile            ischunked;
 481         int volatile            isproxy;
 482         int volatile            rval;
 483         int volatile            hcode;
 484         int                     len;
 485         size_t                  flen;
 486         static size_t           bufsize;
 487         static char             *xferbuf;
 488         const char              *cp, *token;
 489         char                    *ep;
 490         char                    buf[FTPBUFLEN];
 491         const char              *errormsg;
 492         char                    *volatile savefile;
 493         char                    *volatile auth;
 494         char                    *volatile location;
 495         char                    *volatile message;
 496         char                    *uuser, *pass, *host, *port, *path;
 497         char                    *volatile decodedpath;
 498         char                    *puser, *ppass, *useragent;
 499         off_t                   hashbytes, rangestart, rangeend, entitylen;
 500         int                     (*volatile closefunc)(FILE *);
 501         FILE                    *volatile fin;
 502         FILE                    *volatile fout;
 503         time_t                  mtime;
 504         url_t                   urltype;
 505         in_port_t               portnum;
 506
 507         DPRINTF("fetch_url: `%s' proxyenv `%s'\n", url, STRorNULL(proxyenv));
 508
 509         oldintr = oldintp = NULL;
 510         closefunc = NULL;
 511         fin = fout = NULL;
 512         s = -1;
 513         savefile = NULL;
 514         auth = location = message = NULL;
 515         ischunked = isproxy = hcode = 0;
 516         rval = 1;
 517         uuser = pass = host = path = decodedpath = puser = ppass = NULL;
 518
 519         if (parse_url(url, "URL", &urltype, &uuser, &pass, &host, &port,
 520             &portnum, &path) == -1)
 521                 goto cleanup_fetch_url;
 522
 523         if (urltype == FILE_URL_T && ! EMPTYSTRING(host)
 524             && strcasecmp(host, "localhost") != 0) {
 525                 warnx("No support for non local file URL `%s'", url);
 526                 goto cleanup_fetch_url;
 527         }
 528
 529         if (EMPTYSTRING(path)) {
 530                 if (urltype == FTP_URL_T) {
 531                         rval = fetch_ftp(url);
 532                         goto cleanup_fetch_url;
 533                 }
 534                 if (urltype != HTTP_URL_T || outfile == NULL)  {
 535                         warnx("Invalid URL (no file after host) `%s'", url);
 536                         goto cleanup_fetch_url;
 537                 }
 538         }
 539
 540         decodedpath = ftp_strdup(path);
 541         url_decode(decodedpath);
 542
 543         if (outfile)
 544                 savefile = ftp_strdup(outfile);
 545         else {
 546                 cp = strrchr(decodedpath, '/');         /* find savefile */
 547                 if (cp != NULL)
 548                         savefile = ftp_strdup(cp + 1);
 549                 else
 550                         savefile = ftp_strdup(decodedpath);
 551         }
 552         DPRINTF("fetch_url: savefile `%s'\n", savefile);
 553         if (EMPTYSTRING(savefile)) {
 554                 if (urltype == FTP_URL_T) {
 555                         rval = fetch_ftp(url);
 556                         goto cleanup_fetch_url;
 557                 }
 558                 warnx("No file after directory (you must specify an "
 559                     "output file) `%s'", url);
 560                 goto cleanup_fetch_url;
 561         }
 562
 563         restart_point = 0;
 564         filesize = -1;
 565         rangestart = rangeend = entitylen = -1;
 566         mtime = -1;
 567         if (restartautofetch) {
 568                 if (strcmp(savefile, "-") != 0 && *savefile != '|' &&
 569                     stat(savefile, &sb) == 0)
 570                         restart_point = sb.st_size;
 571         }
 572         if (urltype == FILE_URL_T) {            /* file:// URLs */
 573                 direction = "copied";
 574                 fin = fopen(decodedpath, "r");
 575                 if (fin == NULL) {
 576                         warn("Can't open `%s'", decodedpath);
 577                         goto cleanup_fetch_url;
 578                 }
 579                 if (fstat(fileno(fin), &sb) == 0) {
 580                         mtime = sb.st_mtime;
 581                         filesize = sb.st_size;
 582                 }
 583                 if (restart_point) {
 584                         if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
 585                                 warn("Can't seek to restart `%s'",
 586                                     decodedpath);
 587                                 goto cleanup_fetch_url;
 588                         }
 589                 }
 590                 if (verbose) {
 591                         fprintf(ttyout, "Copying %s", decodedpath);
 592                         if (restart_point)
 593                                 fprintf(ttyout, " (restarting at " LLF ")",
 594                                     (LLT)restart_point);
 595                         fputs("\n", ttyout);
 596                 }
 597         } else {                                /* ftp:// or http:// URLs */
 598                 const char *leading;
 599                 int hasleading;
 600
 601                 if (proxyenv == NULL) {
 602                         if (urltype == HTTP_URL_T)
 603                                 proxyenv = getoptionvalue("http_proxy");
 604                         else if (urltype == FTP_URL_T)
 605                                 proxyenv = getoptionvalue("ftp_proxy");
 606                 }
 607                 direction = "retrieved";
 608                 if (! EMPTYSTRING(proxyenv)) {                  /* use proxy */
 609                         url_t purltype;
 610                         char *phost, *ppath;
 611                         char *pport, *no_proxy;
 612                         in_port_t pportnum;
 613
 614                         isproxy = 1;
 615
 616                                 /* check URL against list of no_proxied sites */
 617                         no_proxy = getoptionvalue("no_proxy");
 618                         if (! EMPTYSTRING(no_proxy)) {
 619                                 char *np, *np_copy, *np_iter;
 620                                 unsigned long np_port;
 621                                 size_t hlen, plen;
 622
 623                                 np_iter = np_copy = ftp_strdup(no_proxy);
 624                                 hlen = strlen(host);
 625                                 while ((cp = strsep(&np_iter, " ,")) != NULL) {
 626                                         if (*cp == '\0')
 627                                                 continue;
 628                                         if ((np = strrchr(cp, ':')) != NULL) {
 629                                                 *np++ =  '\0';
 630                                                 np_port = strtoul(np, &ep, 10);
 631                                                 if (*np == '\0' || *ep != '\0')
 632                                                         continue;
 633                                                 if (np_port != portnum)
 634                                                         continue;
 635                                         }
 636                                         plen = strlen(cp);
 637                                         if (hlen < plen)
 638                                                 continue;
 639                                         if (strncasecmp(host + hlen - plen,
 640                                             cp, plen) == 0) {
 641                                                 isproxy = 0;
 642                                                 break;
 643                                         }
 644                                 }
 645                                 FREEPTR(np_copy);
 646                                 if (isproxy == 0 && urltype == FTP_URL_T) {
 647                                         rval = fetch_ftp(url);
 648                                         goto cleanup_fetch_url;
 649                                 }
 650                         }
 651
 652                         if (isproxy) {
 653                                 if (restart_point) {
 654                                         warnx("Can't restart via proxy URL `%s'",
 655                                             proxyenv);
 656                                         goto cleanup_fetch_url;
 657                                 }
 658                                 if (parse_url(proxyenv, "proxy URL", &purltype,
 659                                     &puser, &ppass, &phost, &pport, &pportnum,
 660                                     &ppath) == -1)
 661                                         goto cleanup_fetch_url;
 662
 663                                 if ((purltype != HTTP_URL_T
 664                                      && purltype != FTP_URL_T) ||
 665                                     EMPTYSTRING(phost) ||
 666                                     (! EMPTYSTRING(ppath)
 667                                      && strcmp(ppath, "/") != 0)) {
 668                                         warnx("Malformed proxy URL `%s'",
 669                                             proxyenv);
 670                                         FREEPTR(phost);
 671                                         FREEPTR(pport);
 672                                         FREEPTR(ppath);
 673                                         goto cleanup_fetch_url;
 674                                 }
 675                                 if (isipv6addr(host) &&
 676                                     strchr(host, '%') != NULL) {
 677                                         warnx(
 678 "Scoped address notation `%s' disallowed via web proxy",
 679                                             host);
 680                                         FREEPTR(phost);
 681                                         FREEPTR(pport);
 682                                         FREEPTR(ppath);
 683                                         goto cleanup_fetch_url;
 684                                 }
 685
 686                                 FREEPTR(host);
 687                                 host = phost;
 688                                 FREEPTR(port);
 689                                 port = pport;
 690                                 FREEPTR(path);
 691                                 path = ftp_strdup(url);
 692                                 FREEPTR(ppath);
 693                         }
 694                 } /* ! EMPTYSTRING(proxyenv) */
 695
 696                 memset(&hints, 0, sizeof(hints));
 697                 hints.ai_flags = 0;
 698                 hints.ai_family = family;
 699                 hints.ai_socktype = SOCK_STREAM;
 700                 hints.ai_protocol = 0;
 701                 error = getaddrinfo(host, port, &hints, &res0);
 702                 if (error) {
 703                         warnx("Can't lookup `%s:%s': %s", host, port,
 704                             (error == EAI_SYSTEM) ? strerror(errno)
 705                                                   : gai_strerror(error));
 706                         goto cleanup_fetch_url;
 707                 }
 708                 if (res0->ai_canonname)
 709                         host = res0->ai_canonname;
 710
 711                 s = -1;
 712                 for (res = res0; res; res = res->ai_next) {
 713                         char    hname[NI_MAXHOST], sname[NI_MAXSERV];
 714
 715                         ai_unmapped(res);
 716                         if (getnameinfo(res->ai_addr, res->ai_addrlen,
 717                             hname, sizeof(hname), sname, sizeof(sname),
 718                             NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 719                                 strlcpy(hname, "?", sizeof(hname));
 720                                 strlcpy(sname, "?", sizeof(sname));
 721                         }
 722
 723                         if (verbose && res0->ai_next) {
 724                                 fprintf(ttyout, "Trying %s:%s ...\n",
 725                                     hname, sname);
 726                         }
 727
 728                         s = socket(res->ai_family, SOCK_STREAM,
 729                             res->ai_protocol);
 730                         if (s < 0) {
 731                                 warn(
 732                                     "Can't create socket for connection to "
 733                                     "`%s:%s'", hname, sname);
 734                                 continue;
 735                         }
 736
 737                         if (ftp_connect(s, res->ai_addr, res->ai_addrlen) < 0) {
 738                                 close(s);
 739                                 s = -1;
 740                                 continue;
 741                         }
 742
 743                         /* success */
 744                         break;
 745                 }
 746
 747                 if (s < 0) {
 748                         warnx("Can't connect to `%s:%s'", host, port);
 749                         goto cleanup_fetch_url;
 750                 }
 751
 752                 fin = fdopen(s, "r+");
 753                 /*
 754                  * Construct and send the request.
 755                  */
 756                 if (verbose)
 757                         fprintf(ttyout, "Requesting %s\n", url);
 758                 leading = "  (";
 759                 hasleading = 0;
 760                 if (isproxy) {
 761                         if (verbose) {
 762                                 fprintf(ttyout, "%svia %s:%s", leading,
 763                                     host, port);
 764                                 leading = ", ";
 765                                 hasleading++;
 766                         }
 767                         fprintf(fin, "GET %s HTTP/1.0\r\n", path);
 768                         if (flushcache)
 769                                 fprintf(fin, "Pragma: no-cache\r\n");
 770                 } else {
 771                         fprintf(fin, "GET %s HTTP/1.1\r\n", path);
 772                         if (strchr(host, ':')) {
 773                                 char *h, *p;
 774
 775                                 /*
 776                                  * strip off IPv6 scope identifier, since it is
 777                                  * local to the node
 778                                  */
 779                                 h = ftp_strdup(host);
 780                                 if (isipv6addr(h) &&
 781                                     (p = strchr(h, '%')) != NULL) {
 782                                         *p = '\0';
 783                                 }
 784                                 fprintf(fin, "Host: [%s]", h);
 785                                 free(h);
 786                         } else
 787                                 fprintf(fin, "Host: %s", host);
 788                         if (portnum != HTTP_PORT)
 789                                 fprintf(fin, ":%u", portnum);
 790                         fprintf(fin, "\r\n");
 791                         fprintf(fin, "Accept: */*\r\n");
 792                         fprintf(fin, "Connection: close\r\n");
 793                         if (restart_point) {
 794                                 fputs(leading, ttyout);
 795                                 fprintf(fin, "Range: bytes=" LLF "-\r\n",
 796                                     (LLT)restart_point);
 797                                 fprintf(ttyout, "restarting at " LLF,
 798                                     (LLT)restart_point);
 799                                 leading = ", ";
 800                                 hasleading++;
 801                         }
 802                         if (flushcache)
 803                                 fprintf(fin, "Cache-Control: no-cache\r\n");
 804                 }
 805                 if ((useragent=getenv("FTPUSERAGENT")) != NULL) {
 806                         fprintf(fin, "User-Agent: %s\r\n", useragent);
 807                 } else {
 808                         fprintf(fin, "User-Agent: %s/%s\r\n",
 809                             FTP_PRODUCT, FTP_VERSION);
 810                 }
 811                 if (wwwauth) {
 812                         if (verbose) {
 813                                 fprintf(ttyout, "%swith authorization",
 814                                     leading);
 815                                 leading = ", ";
 816                                 hasleading++;
 817                         }
 818                         fprintf(fin, "Authorization: %s\r\n", wwwauth);
 819                 }
 820                 if (proxyauth) {
 821                         if (verbose) {
 822                                 fprintf(ttyout,
 823                                     "%swith proxy authorization", leading);
 824                                 leading = ", ";
 825                                 hasleading++;
 826                         }
 827                         fprintf(fin, "Proxy-Authorization: %s\r\n", proxyauth);
 828                 }
 829                 if (verbose && hasleading)
 830                         fputs(")\n", ttyout);
 831                 fprintf(fin, "\r\n");
 832                 if (fflush(fin) == EOF) {
 833                         warn("Writing HTTP request");
 834                         goto cleanup_fetch_url;
 835                 }
 836
 837                                 /* Read the response */
 838                 len = get_line(fin, buf, sizeof(buf), &errormsg);
 839                 if (len < 0) {
 840                         if (*errormsg == '\n')
 841                                 errormsg++;
 842                         warnx("Receiving HTTP reply: %s", errormsg);
 843                         goto cleanup_fetch_url;
 844                 }
 845                 while (len > 0 && (ISLWS(buf[len-1])))
 846                         buf[--len] = '\0';
 847                 DPRINTF("fetch_url: received `%s'\n", buf);
 848
 849                                 /* Determine HTTP response code */
 850                 cp = strchr(buf, ' ');
 851                 if (cp == NULL)
 852                         goto improper;
 853                 else
 854                         cp++;
 855                 hcode = strtol(cp, &ep, 10);
 856                 if (*ep != '\0' && !isspace((unsigned char)*ep))
 857                         goto improper;
 858                 message = ftp_strdup(cp);
 859
 860                                 /* Read the rest of the header. */
 861                 while (1) {
 862                         len = get_line(fin, buf, sizeof(buf), &errormsg);
 863                         if (len < 0) {
 864                                 if (*errormsg == '\n')
 865                                         errormsg++;
 866                                 warnx("Receiving HTTP reply: %s", errormsg);
 867                                 goto cleanup_fetch_url;
 868                         }
 869                         while (len > 0 && (ISLWS(buf[len-1])))
 870                                 buf[--len] = '\0';
 871                         if (len == 0)
 872                                 break;
 873                         DPRINTF("fetch_url: received `%s'\n", buf);
 874
 875                 /*
 876                  * Look for some headers
 877                  */
 878
 879                         cp = buf;
 880
 881                         if (match_token(&cp, "Content-Length:")) {
 882                                 filesize = STRTOLL(cp, &ep, 10);
 883                                 if (filesize < 0 || *ep != '\0')
 884                                         goto improper;
 885                                 DPRINTF("fetch_url: parsed len as: " LLF "\n",
 886                                     (LLT)filesize);
 887
 888                         } else if (match_token(&cp, "Content-Range:")) {
 889                                 if (! match_token(&cp, "bytes"))
 890                                         goto improper;
 891
 892                                 if (*cp == '*')
 893                                         cp++;
 894                                 else {
 895                                         rangestart = STRTOLL(cp, &ep, 10);
 896                                         if (rangestart < 0 || *ep != '-')
 897                                                 goto improper;
 898                                         cp = ep + 1;
 899                                         rangeend = STRTOLL(cp, &ep, 10);
 900                                         if (rangeend < 0 || rangeend < rangestart)
 901                                                 goto improper;
 902                                         cp = ep;
 903                                 }
 904                                 if (*cp != '/')
 905                                         goto improper;
 906                                 cp++;
 907                                 if (*cp == '*')
 908                                         cp++;
 909                                 else {
 910                                         entitylen = STRTOLL(cp, &ep, 10);
 911                                         if (entitylen < 0)
 912                                                 goto improper;
 913                                         cp = ep;
 914                                 }
 915                                 if (*cp != '\0')
 916                                         goto improper;
 917
 918 #ifndef NO_DEBUG
 919                                 if (ftp_debug) {
 920                                         fprintf(ttyout, "parsed range as: ");
 921                                         if (rangestart == -1)
 922                                                 fprintf(ttyout, "*");
 923                                         else
 924                                                 fprintf(ttyout, LLF "-" LLF,
 925                                                     (LLT)rangestart,
 926                                                     (LLT)rangeend);
 927                                         fprintf(ttyout, "/" LLF "\n", (LLT)entitylen);
 928                                 }
 929 #endif
 930                                 if (! restart_point) {
 931                                         warnx(
 932                                     "Received unexpected Content-Range header");
 933                                         goto cleanup_fetch_url;
 934                                 }
 935
 936                         } else if (match_token(&cp, "Last-Modified:")) {
 937                                 struct tm parsed;
 938                                 const char *t;
 939
 940                                 memset(&parsed, 0, sizeof(parsed));
 941                                 t = parse_rfc2616time(&parsed, cp);
 942                                 if (t != NULL) {
 943                                         parsed.tm_isdst = -1;
 944                                         if (*t == '\0')
 945                                                 mtime = timegm(&parsed);
 946 #ifndef NO_DEBUG
 947                                         if (ftp_debug && mtime != -1) {
 948                                                 fprintf(ttyout,
 949                                                     "parsed time as: %s",
 950                                                 rfc2822time(localtime(&mtime)));
 951                                         }
 952 #endif
 953                                 }
 954
 955                         } else if (match_token(&cp, "Location:")) {
 956                                 location = ftp_strdup(cp);
 957                                 DPRINTF("fetch_url: parsed location as `%s'\n",
 958                                     cp);
 959
 960                         } else if (match_token(&cp, "Transfer-Encoding:")) {
 961                                 if (match_token(&cp, "binary")) {
 962                                         warnx(
 963                         "Bogus transfer encoding `binary' (fetching anyway)");
 964                                         continue;
 965                                 }
 966                                 if (! (token = match_token(&cp, "chunked"))) {
 967                                         warnx(
 968                                     "Unsupported transfer encoding `%s'",
 969                                             token);
 970                                         goto cleanup_fetch_url;
 971                                 }
 972                                 ischunked++;
 973                                 DPRINTF("fetch_url: using chunked encoding\n");
 974
 975                         } else if (match_token(&cp, "Proxy-Authenticate:")
 976                                 || match_token(&cp, "WWW-Authenticate:")) {
 977                                 if (! (token = match_token(&cp, "Basic"))) {
 978                                         DPRINTF(
 979                         "fetch_url: skipping unknown auth scheme `%s'\n",
 980                                                     token);
 981                                         continue;
 982                                 }
 983                                 FREEPTR(auth);
 984                                 auth = ftp_strdup(token);
 985                                 DPRINTF("fetch_url: parsed auth as `%s'\n", cp);
 986                         }
 987
 988                 }
 989                                 /* finished parsing header */
 990
 991                 switch (hcode) {
 992                 case 200:
 993                         break;
 994                 case 206:
 995                         if (! restart_point) {
 996                                 warnx("Not expecting partial content header");
 997                                 goto cleanup_fetch_url;
 998                         }
 999                         break;
1000                 case 300:
1001                 case 301:
1002                 case 302:
1003                 case 303:
1004                 case 305:
1005                 case 307:
1006                         if (EMPTYSTRING(location)) {
1007                                 warnx(
1008                                 "No redirection Location provided by server");
1009                                 goto cleanup_fetch_url;
1010                         }
1011                         if (redirect_loop++ > 5) {
1012                                 warnx("Too many redirections requested");
1013                                 goto cleanup_fetch_url;
1014                         }
1015                         if (hcode == 305) {
1016                                 if (verbose)
1017                                         fprintf(ttyout, "Redirected via %s\n",
1018                                             location);
1019                                 rval = fetch_url(url, location,
1020                                     proxyauth, wwwauth);
1021                         } else {
1022                                 if (verbose)
1023                                         fprintf(ttyout, "Redirected to %s\n",
1024                                             location);
1025                                 rval = go_fetch(location);
1026                         }
1027                         goto cleanup_fetch_url;
1028 #ifndef NO_AUTH
1029                 case 401:
1030                 case 407:
1031                     {
1032                         char **authp;
1033                         char *auser, *apass;
1034
1035                         if (hcode == 401) {
1036                                 authp = &wwwauth;
1037                                 auser = uuser;
1038                                 apass = pass;
1039                         } else {
1040                                 authp = &proxyauth;
1041                                 auser = puser;
1042                                 apass = ppass;
1043                         }
1044                         if (verbose || *authp == NULL ||
1045                             auser == NULL || apass == NULL)
1046                                 fprintf(ttyout, "%s\n", message);
1047                         if (EMPTYSTRING(auth)) {
1048                                 warnx(
1049                             "No authentication challenge provided by server");
1050                                 goto cleanup_fetch_url;
1051                         }
1052                         if (*authp != NULL) {
1053                                 char reply[10];
1054
1055                                 fprintf(ttyout,
1056                                     "Authorization failed. Retry (y/n)? ");
1057                                 if (get_line(stdin, reply, sizeof(reply), NULL)
1058                                     < 0) {
1059                                         goto cleanup_fetch_url;
1060                                 }
1061                                 if (tolower((unsigned char)reply[0]) != 'y')
1062                                         goto cleanup_fetch_url;
1063                                 auser = NULL;
1064                                 apass = NULL;
1065                         }
1066                         if (auth_url(auth, authp, auser, apass) == 0) {
1067                                 rval = fetch_url(url, proxyenv,
1068                                     proxyauth, wwwauth);
1069                                 memset(*authp, 0, strlen(*authp));
1070                                 FREEPTR(*authp);
1071                         }
1072                         goto cleanup_fetch_url;
1073                     }
1074 #endif
1075                 default:
1076                         if (message)
1077                                 warnx("Error retrieving file `%s'", message);
1078                         else
1079                                 warnx("Unknown error retrieving file");
1080                         goto cleanup_fetch_url;
1081                 }
1082         }               /* end of ftp:// or http:// specific setup */
1083
1084                         /* Open the output file. */
1085         if (strcmp(savefile, "-") == 0) {
1086                 fout = stdout;
1087         } else if (*savefile == '|') {
1088                 oldintp = xsignal(SIGPIPE, SIG_IGN);
1089                 fout = popen(savefile + 1, "w");
1090                 if (fout == NULL) {
1091                         warn("Can't execute `%s'", savefile + 1);
1092                         goto cleanup_fetch_url;
1093                 }
1094                 closefunc = pclose;
1095         } else {
1096                 if ((rangeend != -1 && rangeend <= restart_point) ||
1097                     (rangestart == -1 && filesize != -1 && filesize <= restart_point)) {
1098                         /* already done */
1099                         if (verbose)
1100                                 fprintf(ttyout, "already done\n");
1101                         rval = 0;
1102                         goto cleanup_fetch_url;
1103                 }
1104                 if (restart_point && rangestart != -1) {
1105                         if (entitylen != -1)
1106                                 filesize = entitylen;
1107                         if (rangestart != restart_point) {
1108                                 warnx(
1109                                     "Size of `%s' differs from save file `%s'",
1110                                     url, savefile);
1111                                 goto cleanup_fetch_url;
1112                         }
1113                         fout = fopen(savefile, "a");
1114                 } else
1115                         fout = fopen(savefile, "w");
1116                 if (fout == NULL) {
1117                         warn("Can't open `%s'", savefile);
1118                         goto cleanup_fetch_url;
1119                 }
1120                 closefunc = fclose;
1121         }
1122
1123                         /* Trap signals */
1124         if (sigsetjmp(httpabort, 1))
1125                 goto cleanup_fetch_url;
1126         (void)xsignal(SIGQUIT, psummary);
1127         oldintr = xsignal(SIGINT, aborthttp);
1128
1129         if ((size_t)rcvbuf_size > bufsize) {
1130                 if (xferbuf)
1131                         (void)free(xferbuf);
1132                 bufsize = rcvbuf_size;
1133                 xferbuf = ftp_malloc(bufsize);
1134         }
1135
1136         bytes = 0;
1137         hashbytes = mark;
1138         progressmeter(-1);
1139
1140                         /* Finally, suck down the file. */
1141         do {
1142                 long chunksize;
1143                 short lastchunk;
1144
1145                 chunksize = 0;
1146                 lastchunk = 0;
1147                                         /* read chunk-size */
1148                 if (ischunked) {
1149                         if (fgets(xferbuf, bufsize, fin) == NULL) {
1150                                 warnx("Unexpected EOF reading chunk-size");
1151                                 goto cleanup_fetch_url;
1152                         }
1153                         errno = 0;
1154                         chunksize = strtol(xferbuf, &ep, 16);
1155                         if (ep == xferbuf) {
1156                                 warnx("Invalid chunk-size");
1157                                 goto cleanup_fetch_url;
1158                         }
1159                         if (errno == ERANGE || chunksize < 0) {
1160                                 errno = ERANGE;
1161                                 warn("Chunk-size `%.*s'",
1162                                     (int)(ep-xferbuf), xferbuf);
1163                                 goto cleanup_fetch_url;
1164                         }
1165
1166                                 /*
1167                                  * XXX: Work around bug in Apache 1.3.9 and
1168                                  *      1.3.11, which incorrectly put trailing
1169                                  *      space after the chunk-size.
1170                                  */
1171                         while (*ep == ' ')
1172                                 ep++;
1173
1174                                         /* skip [ chunk-ext ] */
1175                         if (*ep == ';') {
1176                                 while (*ep && *ep != '\r')
1177                                         ep++;
1178                         }
1179
1180                         if (strcmp(ep, "\r\n") != 0) {
1181                                 warnx("Unexpected data following chunk-size");
1182                                 goto cleanup_fetch_url;
1183                         }
1184                         DPRINTF("fetch_url: got chunk-size of " LLF "\n",
1185                             (LLT)chunksize);
1186                         if (chunksize == 0) {
1187                                 lastchunk = 1;
1188                                 goto chunkdone;
1189                         }
1190                 }
1191                                         /* transfer file or chunk */
1192                 while (1) {
1193                         struct timeval then, now, td;
1194                         off_t bufrem;
1195
1196                         if (rate_get)
1197                                 (void)gettimeofday(&then, NULL);
1198                         bufrem = rate_get ? rate_get : (off_t)bufsize;
1199                         if (ischunked)
1200                                 bufrem = MIN(chunksize, bufrem);
1201                         while (bufrem > 0) {
1202                                 flen = fread(xferbuf, sizeof(char),
1203                                     MIN((off_t)bufsize, bufrem), fin);
1204                                 if (flen <= 0)
1205                                         goto chunkdone;
1206                                 bytes += flen;
1207                                 bufrem -= flen;
1208                                 if (fwrite(xferbuf, sizeof(char), flen, fout)
1209                                     != flen) {
1210                                         warn("Writing `%s'", savefile);
1211                                         goto cleanup_fetch_url;
1212                                 }
1213                                 if (hash && !progress) {
1214                                         while (bytes >= hashbytes) {
1215                                                 (void)putc('#', ttyout);
1216                                                 hashbytes += mark;
1217                                         }
1218                                         (void)fflush(ttyout);
1219                                 }
1220                                 if (ischunked) {
1221                                         chunksize -= flen;
1222                                         if (chunksize <= 0)
1223                                                 break;
1224                                 }
1225                         }
1226                         if (rate_get) {
1227                                 while (1) {
1228                                         (void)gettimeofday(&now, NULL);
1229                                         timersub(&now, &then, &td);
1230                                         if (td.tv_sec > 0)
1231                                                 break;
1232                                         usleep(1000000 - td.tv_usec);
1233                                 }
1234                         }
1235                         if (ischunked && chunksize <= 0)
1236                                 break;
1237                 }
1238                                         /* read CRLF after chunk*/
1239  chunkdone:
1240                 if (ischunked) {
1241                         if (fgets(xferbuf, bufsize, fin) == NULL) {
1242                                 warnx("Unexpected EOF reading chunk CRLF");
1243                                 goto cleanup_fetch_url;
1244                         }
1245                         if (strcmp(xferbuf, "\r\n") != 0) {
1246                                 warnx("Unexpected data following chunk");
1247                                 goto cleanup_fetch_url;
1248                         }
1249                         if (lastchunk)
1250                                 break;
1251                 }
1252         } while (ischunked);
1253
1254 /* XXX: deal with optional trailer & CRLF here? */
1255
1256         if (hash && !progress && bytes > 0) {
1257                 if (bytes < mark)
1258                         (void)putc('#', ttyout);
1259                 (void)putc('\n', ttyout);
1260         }
1261         if (ferror(fin)) {
1262                 warn("Reading file");
1263                 goto cleanup_fetch_url;
1264         }
1265         progressmeter(1);
1266         (void)fflush(fout);
1267         if (closefunc == fclose && mtime != -1) {
1268                 struct timeval tval[2];
1269
1270                 (void)gettimeofday(&tval[0], NULL);
1271                 tval[1].tv_sec = mtime;
1272                 tval[1].tv_usec = 0;
1273                 (*closefunc)(fout);
1274                 fout = NULL;
1275
1276                 if (utimes(savefile, tval) == -1) {
1277                         fprintf(ttyout,
1278                             "Can't change modification time to %s",
1279                             rfc2822time(localtime(&mtime)));
1280                 }
1281         }
1282         if (bytes > 0)
1283                 ptransfer(0);
1284         bytes = 0;
1285
1286         rval = 0;
1287         goto cleanup_fetch_url;
1288
1289  improper:
1290         warnx("Improper response from `%s:%s'", host, port);
1291
1292  cleanup_fetch_url:
1293         if (oldintr)
1294                 (void)xsignal(SIGINT, oldintr);
1295         if (oldintp)
1296                 (void)xsignal(SIGPIPE, oldintp);
1297         if (fin != NULL)
1298                 fclose(fin);
1299         else if (s != -1)
1300                 close(s);
1301         if (closefunc != NULL && fout != NULL)
1302                 (*closefunc)(fout);
1303         if (res0)
1304                 freeaddrinfo(res0);
1305         FREEPTR(savefile);
1306         FREEPTR(uuser);
1307         if (pass != NULL)
1308                 memset(pass, 0, strlen(pass));
1309         FREEPTR(pass);
1310         FREEPTR(host);
1311         FREEPTR(port);
1312         FREEPTR(path);
1313         FREEPTR(decodedpath);
1314         FREEPTR(puser);
1315         if (ppass != NULL)
1316                 memset(ppass, 0, strlen(ppass));
1317         FREEPTR(ppass);
1318         FREEPTR(auth);
1319         FREEPTR(location);
1320         FREEPTR(message);
1321         return (rval);
1322 }
1323
1324 /*
1325  * Abort a HTTP retrieval
1326  */
1327 void
1328 aborthttp(int notused)
1329 {
1330         char msgbuf[100];
1331         size_t len;
1332
1333         sigint_raised = 1;
1334         alarmtimer(0);
1335         len = strlcpy(msgbuf, "\nHTTP fetch aborted.\n", sizeof(msgbuf));
1336         write(fileno(ttyout), msgbuf, len);
1337         siglongjmp(httpabort, 1);
1338 }
1339
1340 /*
1341  * Retrieve ftp URL or classic ftp argument using FTP.
1342  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1343  * is still open (e.g, ftp xfer with trailing /)
1344  */
1345 static int
1346 fetch_ftp(const char *url)
1347 {
1348         char            *cp, *xargv[5], rempath[MAXPATHLEN];
1349         char            *host, *path, *dir, *file, *uuser, *pass;
1350         char            *port;
1351         char             cmdbuf[MAXPATHLEN];
1352         char             dirbuf[4];
1353         int              dirhasglob, filehasglob, rval, transtype, xargc;
1354         int              oanonftp, oautologin;
1355         in_port_t        portnum;
1356         url_t            urltype;
1357
1358         DPRINTF("fetch_ftp: `%s'\n", url);
1359         host = path = dir = file = uuser = pass = NULL;
1360         port = NULL;
1361         rval = 1;
1362         transtype = TYPE_I;
1363
1364         if (STRNEQUAL(url, FTP_URL)) {
1365                 if ((parse_url(url, "URL", &urltype, &uuser, &pass,
1366                     &host, &port, &portnum, &path) == -1) ||
1367                     (uuser != NULL && *uuser == '\0') ||
1368                     EMPTYSTRING(host)) {
1369                         warnx("Invalid URL `%s'", url);
1370                         goto cleanup_fetch_ftp;
1371                 }
1372                 /*
1373                  * Note: Don't url_decode(path) here.  We need to keep the
1374                  * distinction between "/" and "%2F" until later.
1375                  */
1376
1377                                         /* check for trailing ';type=[aid]' */
1378                 if (! EMPTYSTRING(path) && (cp = strrchr(path, ';')) != NULL) {
1379                         if (strcasecmp(cp, ";type=a") == 0)
1380                                 transtype = TYPE_A;
1381                         else if (strcasecmp(cp, ";type=i") == 0)
1382                                 transtype = TYPE_I;
1383                         else if (strcasecmp(cp, ";type=d") == 0) {
1384                                 warnx(
1385                             "Directory listing via a URL is not supported");
1386                                 goto cleanup_fetch_ftp;
1387                         } else {
1388                                 warnx("Invalid suffix `%s' in URL `%s'", cp,
1389                                     url);
1390                                 goto cleanup_fetch_ftp;
1391                         }
1392                         *cp = 0;
1393                 }
1394         } else {                        /* classic style `[user@]host:[file]' */
1395                 urltype = CLASSIC_URL_T;
1396                 host = ftp_strdup(url);
1397                 cp = strchr(host, '@');
1398                 if (cp != NULL) {
1399                         *cp = '\0';
1400                         uuser = host;
1401                         anonftp = 0;    /* disable anonftp */
1402                         host = ftp_strdup(cp + 1);
1403                 }
1404                 cp = strchr(host, ':');
1405                 if (cp != NULL) {
1406                         *cp = '\0';
1407                         path = ftp_strdup(cp + 1);
1408                 }
1409         }
1410         if (EMPTYSTRING(host))
1411                 goto cleanup_fetch_ftp;
1412
1413                         /* Extract the file and (if present) directory name. */
1414         dir = path;
1415         if (! EMPTYSTRING(dir)) {
1416                 /*
1417                  * If we are dealing with classic `[user@]host:[path]' syntax,
1418                  * then a path of the form `/file' (resulting from input of the
1419                  * form `host:/file') means that we should do "CWD /" before
1420                  * retrieving the file.  So we set dir="/" and file="file".
1421                  *
1422                  * But if we are dealing with URLs like `ftp://host/path' then
1423                  * a path of the form `/file' (resulting from a URL of the form
1424                  * `ftp://host//file') means that we should do `CWD ' (with an
1425                  * empty argument) before retrieving the file.  So we set
1426                  * dir="" and file="file".
1427                  *
1428                  * If the path does not contain / at all, we set dir=NULL.
1429                  * (We get a path without any slashes if we are dealing with
1430                  * classic `[user@]host:[file]' or URL `ftp://host/file'.)
1431                  *
1432                  * In all other cases, we set dir to a string that does not
1433                  * include the final '/' that separates the dir part from the
1434                  * file part of the path.  (This will be the empty string if
1435                  * and only if we are dealing with a path of the form `/file'
1436                  * resulting from an URL of the form `ftp://host//file'.)
1437                  */
1438                 cp = strrchr(dir, '/');
1439                 if (cp == dir && urltype == CLASSIC_URL_T) {
1440                         file = cp + 1;
1441                         (void)strlcpy(dirbuf, "/", sizeof(dirbuf));
1442                         dir = dirbuf;
1443                 } else if (cp != NULL) {
1444                         *cp++ = '\0';
1445                         file = cp;
1446                 } else {
1447                         file = dir;
1448                         dir = NULL;
1449                 }
1450         } else
1451                 dir = NULL;
1452         if (urltype == FTP_URL_T && file != NULL) {
1453                 url_decode(file);
1454                 /* but still don't url_decode(dir) */
1455         }
1456         DPRINTF("fetch_ftp: user `%s' pass `%s' host %s port %s "
1457             "path `%s' dir `%s' file `%s'\n",
1458             STRorNULL(uuser), STRorNULL(pass),
1459             STRorNULL(host), STRorNULL(port),
1460             STRorNULL(path), STRorNULL(dir), STRorNULL(file));
1461
1462         dirhasglob = filehasglob = 0;
1463         if (doglob && urltype == CLASSIC_URL_T) {
1464                 if (! EMPTYSTRING(dir) && strpbrk(dir, "*?[]{}") != NULL)
1465                         dirhasglob = 1;
1466                 if (! EMPTYSTRING(file) && strpbrk(file, "*?[]{}") != NULL)
1467                         filehasglob = 1;
1468         }
1469
1470                         /* Set up the connection */
1471         oanonftp = anonftp;
1472         if (connected)
1473                 disconnect(0, NULL);
1474         anonftp = oanonftp;
1475         (void)strlcpy(cmdbuf, getprogname(), sizeof(cmdbuf));
1476         xargv[0] = cmdbuf;
1477         xargv[1] = host;
1478         xargv[2] = NULL;
1479         xargc = 2;
1480         if (port) {
1481                 xargv[2] = port;
1482                 xargv[3] = NULL;
1483                 xargc = 3;
1484         }
1485         oautologin = autologin;
1486                 /* don't autologin in setpeer(), use ftp_login() below */
1487         autologin = 0;
1488         setpeer(xargc, xargv);
1489         autologin = oautologin;
1490         if ((connected == 0) ||
1491             (connected == 1 && !ftp_login(host, uuser, pass))) {
1492                 warnx("Can't connect or login to host `%s:%s'",
1493                         host, port ? port : "?");
1494                 goto cleanup_fetch_ftp;
1495         }
1496
1497         switch (transtype) {
1498         case TYPE_A:
1499                 setascii(1, xargv);
1500                 break;
1501         case TYPE_I:
1502                 setbinary(1, xargv);
1503                 break;
1504         default:
1505                 errx(1, "fetch_ftp: unknown transfer type %d", transtype);
1506         }
1507
1508                 /*
1509                  * Change directories, if necessary.
1510                  *
1511                  * Note: don't use EMPTYSTRING(dir) below, because
1512                  * dir=="" means something different from dir==NULL.
1513                  */
1514         if (dir != NULL && !dirhasglob) {
1515                 char *nextpart;
1516
1517                 /*
1518                  * If we are dealing with a classic `[user@]host:[path]'
1519                  * (urltype is CLASSIC_URL_T) then we have a raw directory
1520                  * name (not encoded in any way) and we can change
1521                  * directories in one step.
1522                  *
1523                  * If we are dealing with an `ftp://host/path' URL
1524                  * (urltype is FTP_URL_T), then RFC 3986 says we need to
1525                  * send a separate CWD command for each unescaped "/"
1526                  * in the path, and we have to interpret %hex escaping
1527                  * *after* we find the slashes.  It's possible to get
1528                  * empty components here, (from multiple adjacent
1529                  * slashes in the path) and RFC 3986 says that we should
1530                  * still do `CWD ' (with a null argument) in such cases.
1531                  *
1532                  * Many ftp servers don't support `CWD ', so if there's an
1533                  * error performing that command, bail out with a descriptive
1534                  * message.
1535                  *
1536                  * Examples:
1537                  *
1538                  * host:                        dir="", urltype=CLASSIC_URL_T
1539                  *              logged in (to default directory)
1540                  * host:file                    dir=NULL, urltype=CLASSIC_URL_T
1541                  *              "RETR file"
1542                  * host:dir/                    dir="dir", urltype=CLASSIC_URL_T
1543                  *              "CWD dir", logged in
1544                  * ftp://host/                  dir="", urltype=FTP_URL_T
1545                  *              logged in (to default directory)
1546                  * ftp://host/dir/              dir="dir", urltype=FTP_URL_T
1547                  *              "CWD dir", logged in
1548                  * ftp://host/file              dir=NULL, urltype=FTP_URL_T
1549                  *              "RETR file"
1550                  * ftp://host//file             dir="", urltype=FTP_URL_T
1551                  *              "CWD ", "RETR file"
1552                  * host:/file                   dir="/", urltype=CLASSIC_URL_T
1553                  *              "CWD /", "RETR file"
1554                  * ftp://host///file            dir="/", urltype=FTP_URL_T
1555                  *              "CWD ", "CWD ", "RETR file"
1556                  * ftp://host/%2F/file          dir="%2F", urltype=FTP_URL_T
1557                  *              "CWD /", "RETR file"
1558                  * ftp://host/foo/file          dir="foo", urltype=FTP_URL_T
1559                  *              "CWD foo", "RETR file"
1560                  * ftp://host/foo/bar/file      dir="foo/bar"
1561                  *              "CWD foo", "CWD bar", "RETR file"
1562                  * ftp://host//foo/bar/file     dir="/foo/bar"
1563                  *              "CWD ", "CWD foo", "CWD bar", "RETR file"
1564                  * ftp://host/foo//bar/file     dir="foo//bar"
1565                  *              "CWD foo", "CWD ", "CWD bar", "RETR file"
1566                  * ftp://host/%2F/foo/bar/file  dir="%2F/foo/bar"
1567                  *              "CWD /", "CWD foo", "CWD bar", "RETR file"
1568                  * ftp://host/%2Ffoo/bar/file   dir="%2Ffoo/bar"
1569                  *              "CWD /foo", "CWD bar", "RETR file"
1570                  * ftp://host/%2Ffoo%2Fbar/file dir="%2Ffoo%2Fbar"
1571                  *              "CWD /foo/bar", "RETR file"
1572                  * ftp://host/%2Ffoo%2Fbar%2Ffile       dir=NULL
1573                  *              "RETR /foo/bar/file"
1574                  *
1575                  * Note that we don't need `dir' after this point.
1576                  */
1577                 do {
1578                         if (urltype == FTP_URL_T) {
1579                                 nextpart = strchr(dir, '/');
1580                                 if (nextpart) {
1581                                         *nextpart = '\0';
1582                                         nextpart++;
1583                                 }
1584                                 url_decode(dir);
1585                         } else
1586                                 nextpart = NULL;
1587                         DPRINTF("fetch_ftp: dir `%s', nextpart `%s'\n",
1588                             STRorNULL(dir), STRorNULL(nextpart));
1589                         if (urltype == FTP_URL_T || *dir != '\0') {
1590                                 (void)strlcpy(cmdbuf, "cd", sizeof(cmdbuf));
1591                                 xargv[0] = cmdbuf;
1592                                 xargv[1] = dir;
1593                                 xargv[2] = NULL;
1594                                 dirchange = 0;
1595                                 cd(2, xargv);
1596                                 if (! dirchange) {
1597                                         if (*dir == '\0' && code == 500)
1598                                                 fprintf(stderr,
1599 "\n"
1600 "ftp: The `CWD ' command (without a directory), which is required by\n"
1601 "     RFC 3986 to support the empty directory in the URL pathname (`//'),\n"
1602 "     conflicts with the server's conformance to RFC 959.\n"
1603 "     Try the same URL without the `//' in the URL pathname.\n"
1604 "\n");
1605                                         goto cleanup_fetch_ftp;
1606                                 }
1607                         }
1608                         dir = nextpart;
1609                 } while (dir != NULL);
1610         }
1611
1612         if (EMPTYSTRING(file)) {
1613                 rval = -1;
1614                 goto cleanup_fetch_ftp;
1615         }
1616
1617         if (dirhasglob) {
1618                 (void)strlcpy(rempath, dir,     sizeof(rempath));
1619                 (void)strlcat(rempath, "/",     sizeof(rempath));
1620                 (void)strlcat(rempath, file,    sizeof(rempath));
1621                 file = rempath;
1622         }
1623
1624                         /* Fetch the file(s). */
1625         xargc = 2;
1626         (void)strlcpy(cmdbuf, "get", sizeof(cmdbuf));
1627         xargv[0] = cmdbuf;
1628         xargv[1] = file;
1629         xargv[2] = NULL;
1630         if (dirhasglob || filehasglob) {
1631                 int ointeractive;
1632
1633                 ointeractive = interactive;
1634                 interactive = 0;
1635                 if (restartautofetch)
1636                         (void)strlcpy(cmdbuf, "mreget", sizeof(cmdbuf));
1637                 else
1638                         (void)strlcpy(cmdbuf, "mget", sizeof(cmdbuf));
1639                 xargv[0] = cmdbuf;
1640                 mget(xargc, xargv);
1641                 interactive = ointeractive;
1642         } else {
1643                 if (outfile == NULL) {
1644                         cp = strrchr(file, '/');        /* find savefile */
1645                         if (cp != NULL)
1646                                 outfile = cp + 1;
1647                         else
1648                                 outfile = file;
1649                 }
1650                 xargv[2] = (char *)outfile;
1651                 xargv[3] = NULL;
1652                 xargc++;
1653                 if (restartautofetch)
1654                         reget(xargc, xargv);
1655                 else
1656                         get(xargc, xargv);
1657         }
1658
1659         if ((code / 100) == COMPLETE)
1660                 rval = 0;
1661
1662  cleanup_fetch_ftp:
1663         FREEPTR(port);
1664         FREEPTR(host);
1665         FREEPTR(path);
1666         FREEPTR(uuser);
1667         if (pass)
1668                 memset(pass, 0, strlen(pass));
1669         FREEPTR(pass);
1670         return (rval);
1671 }
1672
1673 /*
1674  * Retrieve the given file to outfile.
1675  * Supports arguments of the form:
1676  *      "host:path", "ftp://host/path"  if $ftpproxy, call fetch_url() else
1677  *                                      call fetch_ftp()
1678  *      "http://host/path"              call fetch_url() to use HTTP
1679  *      "file:///path"                  call fetch_url() to copy
1680  *      "about:..."                     print a message
1681  *
1682  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1683  * is still open (e.g, ftp xfer with trailing /)
1684  */
1685 static int
1686 go_fetch(const char *url)
1687 {
1688         char *proxyenv;
1689
1690 #ifndef NO_ABOUT
1691         /*
1692          * Check for about:*
1693          */
1694         if (STRNEQUAL(url, ABOUT_URL)) {
1695                 url += sizeof(ABOUT_URL) -1;
1696                 if (strcasecmp(url, "ftp") == 0 ||
1697                     strcasecmp(url, "tnftp") == 0) {
1698                         fputs(
1699 "This version of ftp has been enhanced by Luke Mewburn <lukem@NetBSD.org>\n"
1700 "for the NetBSD project.  Execute `man ftp' for more details.\n", ttyout);
1701                 } else if (strcasecmp(url, "lukem") == 0) {
1702                         fputs(
1703 "Luke Mewburn is the author of most of the enhancements in this ftp client.\n"
1704 "Please email feedback to <lukem@NetBSD.org>.\n", ttyout);
1705                 } else if (strcasecmp(url, "netbsd") == 0) {
1706                         fputs(
1707 "NetBSD is a freely available and redistributable UNIX-like operating system.\n"
1708 "For more information, see http://www.NetBSD.org/\n", ttyout);
1709                 } else if (strcasecmp(url, "version") == 0) {
1710                         fprintf(ttyout, "Version: %s %s%s\n",
1711                             FTP_PRODUCT, FTP_VERSION,
1712 #ifdef INET6
1713                             ""
1714 #else
1715                             " (-IPv6)"
1716 #endif
1717                         );
1718                 } else {
1719                         fprintf(ttyout, "`%s' is an interesting topic.\n", url);
1720                 }
1721                 fputs("\n", ttyout);
1722                 return (0);
1723         }
1724 #endif
1725
1726         /*
1727          * Check for file:// and http:// URLs.
1728          */
1729         if (STRNEQUAL(url, HTTP_URL) || STRNEQUAL(url, FILE_URL))
1730                 return (fetch_url(url, NULL, NULL, NULL));
1731
1732         /*
1733          * Try FTP URL-style and host:file arguments next.
1734          * If ftpproxy is set with an FTP URL, use fetch_url()
1735          * Othewise, use fetch_ftp().
1736          */
1737         proxyenv = getoptionvalue("ftp_proxy");
1738         if (!EMPTYSTRING(proxyenv) && STRNEQUAL(url, FTP_URL))
1739                 return (fetch_url(url, NULL, NULL, NULL));
1740
1741         return (fetch_ftp(url));
1742 }
1743
1744 /*
1745  * Retrieve multiple files from the command line,
1746  * calling go_fetch() for each file.
1747  *
1748  * If an ftp path has a trailing "/", the path will be cd-ed into and
1749  * the connection remains open, and the function will return -1
1750  * (to indicate the connection is alive).
1751  * If an error occurs the return value will be the offset+1 in
1752  * argv[] of the file that caused a problem (i.e, argv[x]
1753  * returns x+1)
1754  * Otherwise, 0 is returned if all files retrieved successfully.
1755  */
1756 int
1757 auto_fetch(int argc, char *argv[])
1758 {
1759         volatile int    argpos, rval;
1760
1761         argpos = rval = 0;
1762
1763         if (sigsetjmp(toplevel, 1)) {
1764                 if (connected)
1765                         disconnect(0, NULL);
1766                 if (rval > 0)
1767                         rval = argpos + 1;
1768                 return (rval);
1769         }
1770         (void)xsignal(SIGINT, intr);
1771         (void)xsignal(SIGPIPE, lostpeer);
1772
1773         /*
1774          * Loop through as long as there's files to fetch.
1775          */
1776         for (; (rval == 0) && (argpos < argc); argpos++) {
1777                 if (strchr(argv[argpos], ':') == NULL)
1778                         break;
1779                 redirect_loop = 0;
1780                 if (!anonftp)
1781                         anonftp = 2;    /* Handle "automatic" transfers. */
1782                 rval = go_fetch(argv[argpos]);
1783                 if (outfile != NULL && strcmp(outfile, "-") != 0
1784                     && outfile[0] != '|')
1785                         outfile = NULL;
1786                 if (rval > 0)
1787                         rval = argpos + 1;
1788         }
1789
1790         if (connected && rval != -1)
1791                 disconnect(0, NULL);
1792         return (rval);
1793 }
1794
1795
1796 /*
1797  * Upload multiple files from the command line.
1798  *
1799  * If an error occurs the return value will be the offset+1 in
1800  * argv[] of the file that caused a problem (i.e, argv[x]
1801  * returns x+1)
1802  * Otherwise, 0 is returned if all files uploaded successfully.
1803  */
1804 int
1805 auto_put(int argc, char **argv, const char *uploadserver)
1806 {
1807         char    *uargv[4], *path, *pathsep;
1808         int      uargc, rval, argpos;
1809         size_t   len;
1810         char     cmdbuf[MAX_C_NAME];
1811
1812         (void)strlcpy(cmdbuf, "mput", sizeof(cmdbuf));
1813         uargv[0] = cmdbuf;
1814         uargv[1] = argv[0];
1815         uargc = 2;
1816         uargv[2] = uargv[3] = NULL;
1817         pathsep = NULL;
1818         rval = 1;
1819
1820         DPRINTF("auto_put: target `%s'\n", uploadserver);
1821
1822         path = ftp_strdup(uploadserver);
1823         len = strlen(path);
1824         if (path[len - 1] != '/' && path[len - 1] != ':') {
1825                         /*
1826                          * make sure we always pass a directory to auto_fetch
1827                          */
1828                 if (argc > 1) {         /* more than one file to upload */
1829                         len = strlen(uploadserver) + 2; /* path + "/" + "\0" */
1830                         free(path);
1831                         path = (char *)ftp_malloc(len);
1832                         (void)strlcpy(path, uploadserver, len);
1833                         (void)strlcat(path, "/", len);
1834                 } else {                /* single file to upload */
1835                         (void)strlcpy(cmdbuf, "put", sizeof(cmdbuf));
1836                         uargv[0] = cmdbuf;
1837                         pathsep = strrchr(path, '/');
1838                         if (pathsep == NULL) {
1839                                 pathsep = strrchr(path, ':');
1840                                 if (pathsep == NULL) {
1841                                         warnx("Invalid URL `%s'", path);
1842                                         goto cleanup_auto_put;
1843                                 }
1844                                 pathsep++;
1845                                 uargv[2] = ftp_strdup(pathsep);
1846                                 pathsep[0] = '/';
1847                         } else
1848                                 uargv[2] = ftp_strdup(pathsep + 1);
1849                         pathsep[1] = '\0';
1850                         uargc++;
1851                 }
1852         }
1853         DPRINTF("auto_put: URL `%s' argv[2] `%s'\n",
1854             path, STRorNULL(uargv[2]));
1855
1856                         /* connect and cwd */
1857         rval = auto_fetch(1, &path);
1858         if(rval >= 0)
1859                 goto cleanup_auto_put;
1860
1861         rval = 0;
1862
1863                         /* target filename provided; upload 1 file */
1864                         /* XXX : is this the best way? */
1865         if (uargc == 3) {
1866                 uargv[1] = argv[0];
1867                 put(uargc, uargv);
1868                 if ((code / 100) != COMPLETE)
1869                         rval = 1;
1870         } else {        /* otherwise a target dir: upload all files to it */
1871                 for(argpos = 0; argv[argpos] != NULL; argpos++) {
1872                         uargv[1] = argv[argpos];
1873                         mput(uargc, uargv);
1874                         if ((code / 100) != COMPLETE) {
1875                                 rval = argpos + 1;
1876                                 break;
1877                         }
1878                 }
1879         }
1880
1881  cleanup_auto_put:
1882         free(path);
1883         FREEPTR(uargv[2]);
1884         return (rval);
1885 }