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