contrib/tnftp/fetch.c

   1 /*      $NetBSD: fetch.c,v 1.182 2007/08/22 23:47:13 lukem Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1997-2007 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Luke Mewburn.
   9  *
  10  * This code is derived from software contributed to The NetBSD Foundation
  11  * by Scott Aaron Bamford.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the NetBSD
  24  *      Foundation, Inc. and its contributors.
  25  * 4. Neither the name of The NetBSD Foundation nor the names of its
  26  *    contributors may be used to endorse or promote products derived
  27  *    from this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  30  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  31  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  32  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  33  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  34  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  35  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  36  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  37  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  39  * POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 #include <sys/cdefs.h>
  43 #ifndef lint
  44 __RCSID("$NetBSD: fetch.c,v 1.182 2007/08/22 23:47:13 lukem Exp $");
  45 #endif /* not lint */
  46
  47 /*
  48  * FTP User Program -- Command line file retrieval
  49  */
  50
  51 #include <sys/types.h>
  52 #include <sys/param.h>
  53 #include <sys/socket.h>
  54 #include <sys/stat.h>
  55 #include <sys/time.h>
  56
  57 #include <netinet/in.h>
  58
  59 #include <arpa/ftp.h>
  60 #include <arpa/inet.h>
  61
  62 #include <ctype.h>
  63 #include <err.h>
  64 #include <errno.h>
  65 #include <netdb.h>
  66 #include <fcntl.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71 #include <time.h>
  72
  73 #include "ftp_var.h"
  74 #include "version.h"
  75
  76 typedef enum {
  77         UNKNOWN_URL_T=-1,
  78         HTTP_URL_T,
  79         FTP_URL_T,
  80         FILE_URL_T,
  81         CLASSIC_URL_T
  82 } url_t;
  83
  84 void            aborthttp(int);
  85 #ifndef NO_AUTH
  86 static int      auth_url(const char *, char **, const char *, const char *);
  87 static void     base64_encode(const unsigned char *, size_t, unsigned char *);
  88 #endif
  89 static int      go_fetch(const char *);
  90 static int      fetch_ftp(const char *);
  91 static int      fetch_url(const char *, const char *, char *, char *);
  92 static const char *match_token(const char **, const char *);
  93 static int      parse_url(const char *, const char *, url_t *, char **,
  94                             char **, char **, char **, in_port_t *, char **);
  95 static void     url_decode(char *);
  96
  97 static int      redirect_loop;
  98
  99
 100 #define STRNEQUAL(a,b)  (strncasecmp((a), (b), sizeof((b))-1) == 0)
 101 #define ISLWS(x)        ((x)=='\r' || (x)=='\n' || (x)==' ' || (x)=='\t')
 102 #define SKIPLWS(x)      do { while (ISLWS((*x))) x++; } while (0)
 103
 104
 105 #define ABOUT_URL       "about:"        /* propaganda */
 106 #define FILE_URL        "file://"       /* file URL prefix */
 107 #define FTP_URL         "ftp://"        /* ftp URL prefix */
 108 #define HTTP_URL        "http://"       /* http URL prefix */
 109
 110
 111 /*
 112  * Determine if token is the next word in buf (case insensitive).
 113  * If so, advance buf past the token and any trailing LWS, and
 114  * return a pointer to the token (in buf).  Otherwise, return NULL.
 115  * token may be preceded by LWS.
 116  * token must be followed by LWS or NUL.  (I.e, don't partial match).
 117  */
 118 static const char *
 119 match_token(const char **buf, const char *token)
 120 {
 121         const char      *p, *orig;
 122         size_t          tlen;
 123
 124         tlen = strlen(token);
 125         p = *buf;
 126         SKIPLWS(p);
 127         orig = p;
 128         if (strncasecmp(p, token, tlen) != 0)
 129                 return NULL;
 130         p += tlen;
 131         if (*p != '\0' && !ISLWS(*p))
 132                 return NULL;
 133         SKIPLWS(p);
 134         orig = *buf;
 135         *buf = p;
 136         return orig;
 137 }
 138
 139 #ifndef NO_AUTH
 140 /*
 141  * Generate authorization response based on given authentication challenge.
 142  * Returns -1 if an error occurred, otherwise 0.
 143  * Sets response to a malloc(3)ed string; caller should free.
 144  */
 145 static int
 146 auth_url(const char *challenge, char **response, const char *guser,
 147         const char *gpass)
 148 {
 149         const char      *cp, *scheme, *errormsg;
 150         char            *ep, *clear, *realm;
 151         char             user[BUFSIZ], *pass;
 152         int              rval;
 153         size_t           len, clen, rlen;
 154
 155         *response = NULL;
 156         clear = realm = NULL;
 157         rval = -1;
 158         cp = challenge;
 159         scheme = "Basic";       /* only support Basic authentication */
 160
 161         DPRINTF("auth_url: challenge `%s'\n", challenge);
 162
 163         if (! match_token(&cp, scheme)) {
 164                 warnx("Unsupported authentication challenge `%s'",
 165                     challenge);
 166                 goto cleanup_auth_url;
 167         }
 168
 169 #define REALM "realm=\""
 170         if (STRNEQUAL(cp, REALM))
 171                 cp += sizeof(REALM) - 1;
 172         else {
 173                 warnx("Unsupported authentication challenge `%s'",
 174                     challenge);
 175                 goto cleanup_auth_url;
 176         }
 177 /* XXX: need to improve quoted-string parsing to support \ quoting, etc. */
 178         if ((ep = strchr(cp, '\"')) != NULL) {
 179                 size_t len = ep - cp;
 180
 181                 realm = (char *)ftp_malloc(len + 1);
 182                 (void)strlcpy(realm, cp, len + 1);
 183         } else {
 184                 warnx("Unsupported authentication challenge `%s'",
 185                     challenge);
 186                 goto cleanup_auth_url;
 187         }
 188
 189         fprintf(ttyout, "Username for `%s': ", realm);
 190         if (guser != NULL) {
 191                 (void)strlcpy(user, guser, sizeof(user));
 192                 fprintf(ttyout, "%s\n", user);
 193         } else {
 194                 (void)fflush(ttyout);
 195                 if (getline(stdin, user, sizeof(user), &errormsg) < 0) {
 196                         warnx("%s; can't authenticate", errormsg);
 197                         goto cleanup_auth_url;
 198                 }
 199         }
 200         if (gpass != NULL)
 201                 pass = (char *)gpass;
 202         else {
 203                 pass = getpass("Password: ");
 204                 if (pass == NULL) {
 205                         warnx("Can't read password");
 206                         goto cleanup_auth_url;
 207                 }
 208         }
 209
 210         clen = strlen(user) + strlen(pass) + 2; /* user + ":" + pass + "\0" */
 211         clear = (char *)ftp_malloc(clen);
 212         (void)strlcpy(clear, user, clen);
 213         (void)strlcat(clear, ":", clen);
 214         (void)strlcat(clear, pass, clen);
 215         if (gpass == NULL)
 216                 memset(pass, 0, strlen(pass));
 217
 218                                                 /* scheme + " " + enc + "\0" */
 219         rlen = strlen(scheme) + 1 + (clen + 2) * 4 / 3 + 1;
 220         *response = (char *)ftp_malloc(rlen);
 221         (void)strlcpy(*response, scheme, rlen);
 222         len = strlcat(*response, " ", rlen);
 223                         /* use  `clen - 1'  to not encode the trailing NUL */
 224         base64_encode((unsigned char *)clear, clen - 1,
 225             (unsigned char *)*response + len);
 226         memset(clear, 0, clen);
 227         rval = 0;
 228
 229  cleanup_auth_url:
 230         FREEPTR(clear);
 231         FREEPTR(realm);
 232         return (rval);
 233 }
 234
 235 /*
 236  * Encode len bytes starting at clear using base64 encoding into encoded,
 237  * which should be at least ((len + 2) * 4 / 3 + 1) in size.
 238  */
 239 static void
 240 base64_encode(const unsigned char *clear, size_t len, unsigned char *encoded)
 241 {
 242         static const unsigned char enc[] =
 243             "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 244         unsigned char   *cp;
 245         int      i;
 246
 247         cp = encoded;
 248         for (i = 0; i < len; i += 3) {
 249                 *(cp++) = enc[((clear[i + 0] >> 2))];
 250                 *(cp++) = enc[((clear[i + 0] << 4) & 0x30)
 251                             | ((clear[i + 1] >> 4) & 0x0f)];
 252                 *(cp++) = enc[((clear[i + 1] << 2) & 0x3c)
 253                             | ((clear[i + 2] >> 6) & 0x03)];
 254                 *(cp++) = enc[((clear[i + 2]     ) & 0x3f)];
 255         }
 256         *cp = '\0';
 257         while (i-- > len)
 258                 *(--cp) = '=';
 259 }
 260 #endif
 261
 262 /*
 263  * Decode %xx escapes in given string, `in-place'.
 264  */
 265 static void
 266 url_decode(char *url)
 267 {
 268         unsigned char *p, *q;
 269
 270         if (EMPTYSTRING(url))
 271                 return;
 272         p = q = (unsigned char *)url;
 273
 274 #define HEXTOINT(x) (x - (isdigit(x) ? '0' : (islower(x) ? 'a' : 'A') - 10))
 275         while (*p) {
 276                 if (p[0] == '%'
 277                     && p[1] && isxdigit((unsigned char)p[1])
 278                     && p[2] && isxdigit((unsigned char)p[2])) {
 279                         *q++ = HEXTOINT(p[1]) * 16 + HEXTOINT(p[2]);
 280                         p+=3;
 281                 } else
 282                         *q++ = *p++;
 283         }
 284         *q = '\0';
 285 }
 286
 287
 288 /*
 289  * Parse URL of form (per RFC3986):
 290  *      <type>://[<user>[:<password>]@]<host>[:<port>][/<path>]
 291  * Returns -1 if a parse error occurred, otherwise 0.
 292  * It's the caller's responsibility to url_decode() the returned
 293  * user, pass and path.
 294  *
 295  * Sets type to url_t, each of the given char ** pointers to a
 296  * malloc(3)ed strings of the relevant section, and port to
 297  * the number given, or ftpport if ftp://, or httpport if http://.
 298  *
 299  * XXX: this is not totally RFC3986 compliant; <path> will have the
 300  * leading `/' unless it's an ftp:// URL, as this makes things easier
 301  * for file:// and http:// URLs.  ftp:// URLs have the `/' between the
 302  * host and the URL-path removed, but any additional leading slashes
 303  * in the URL-path are retained (because they imply that we should
 304  * later do "CWD" with a null argument).
 305  *
 306  * Examples:
 307  *       input URL                       output path
 308  *       ---------                       -----------
 309  *      "http://host"                   "/"
 310  *      "http://host/"                  "/"
 311  *      "http://host/path"              "/path"
 312  *      "file://host/dir/file"          "dir/file"
 313  *      "ftp://host"                    ""
 314  *      "ftp://host/"                   ""
 315  *      "ftp://host//"                  "/"
 316  *      "ftp://host/dir/file"           "dir/file"
 317  *      "ftp://host//dir/file"          "/dir/file"
 318  */
 319 static int
 320 parse_url(const char *url, const char *desc, url_t *type,
 321                 char **user, char **pass, char **host, char **port,
 322                 in_port_t *portnum, char **path)
 323 {
 324         const char      *origurl;
 325         char            *cp, *ep, *thost, *tport;
 326         size_t           len;
 327
 328         if (url == NULL || desc == NULL || type == NULL || user == NULL
 329             || pass == NULL || host == NULL || port == NULL || portnum == NULL
 330             || path == NULL)
 331                 errx(1, "parse_url: invoked with NULL argument!");
 332
 333         origurl = url;
 334         *type = UNKNOWN_URL_T;
 335         *user = *pass = *host = *port = *path = NULL;
 336         *portnum = 0;
 337         tport = NULL;
 338
 339         if (STRNEQUAL(url, HTTP_URL)) {
 340                 url += sizeof(HTTP_URL) - 1;
 341                 *type = HTTP_URL_T;
 342                 *portnum = HTTP_PORT;
 343                 tport = httpport;
 344         } else if (STRNEQUAL(url, FTP_URL)) {
 345                 url += sizeof(FTP_URL) - 1;
 346                 *type = FTP_URL_T;
 347                 *portnum = FTP_PORT;
 348                 tport = ftpport;
 349         } else if (STRNEQUAL(url, FILE_URL)) {
 350                 url += sizeof(FILE_URL) - 1;
 351                 *type = FILE_URL_T;
 352         } else {
 353                 warnx("Invalid %s `%s'", desc, url);
 354  cleanup_parse_url:
 355                 FREEPTR(*user);
 356                 if (*pass != NULL)
 357                         memset(*pass, 0, strlen(*pass));
 358                 FREEPTR(*pass);
 359                 FREEPTR(*host);
 360                 FREEPTR(*port);
 361                 FREEPTR(*path);
 362                 return (-1);
 363         }
 364
 365         if (*url == '\0')
 366                 return (0);
 367
 368                         /* find [user[:pass]@]host[:port] */
 369         ep = strchr(url, '/');
 370         if (ep == NULL)
 371                 thost = ftp_strdup(url);
 372         else {
 373                 len = ep - url;
 374                 thost = (char *)ftp_malloc(len + 1);
 375                 (void)strlcpy(thost, url, len + 1);
 376                 if (*type == FTP_URL_T) /* skip first / for ftp URLs */
 377                         ep++;
 378                 *path = ftp_strdup(ep);
 379         }
 380
 381         cp = strchr(thost, '@');        /* look for user[:pass]@ in URLs */
 382         if (cp != NULL) {
 383                 if (*type == FTP_URL_T)
 384                         anonftp = 0;    /* disable anonftp */
 385                 *user = thost;
 386                 *cp = '\0';
 387                 thost = ftp_strdup(cp + 1);
 388                 cp = strchr(*user, ':');
 389                 if (cp != NULL) {
 390                         *cp = '\0';
 391                         *pass = ftp_strdup(cp + 1);
 392                 }
 393                 url_decode(*user);
 394                 if (*pass)
 395                         url_decode(*pass);
 396         }
 397
 398 #ifdef INET6
 399                         /*
 400                          * Check if thost is an encoded IPv6 address, as per
 401                          * RFC3986:
 402                          *      `[' ipv6-address ']'
 403                          */
 404         if (*thost == '[') {
 405                 cp = thost + 1;
 406                 if ((ep = strchr(cp, ']')) == NULL ||
 407                     (ep[1] != '\0' && ep[1] != ':')) {
 408                         warnx("Invalid address `%s' in %s `%s'",
 409                             thost, desc, origurl);
 410                         goto cleanup_parse_url;
 411                 }
 412                 len = ep - cp;          /* change `[xyz]' -> `xyz' */
 413                 memmove(thost, thost + 1, len);
 414                 thost[len] = '\0';
 415                 if (! isipv6addr(thost)) {
 416                         warnx("Invalid IPv6 address `%s' in %s `%s'",
 417                             thost, desc, origurl);
 418                         goto cleanup_parse_url;
 419                 }
 420                 cp = ep + 1;
 421                 if (*cp == ':')
 422                         cp++;
 423                 else
 424                         cp = NULL;
 425         } else
 426 #endif /* INET6 */
 427                 if ((cp = strchr(thost, ':')) != NULL)
 428                         *cp++ =  '\0';
 429         *host = thost;
 430
 431                         /* look for [:port] */
 432         if (cp != NULL) {
 433                 long    nport;
 434
 435                 nport = parseport(cp, -1);
 436                 if (nport == -1) {
 437                         warnx("Unknown port `%s' in %s `%s'",
 438                             cp, desc, origurl);
 439                         goto cleanup_parse_url;
 440                 }
 441                 *portnum = nport;
 442                 tport = cp;
 443         }
 444
 445         if (tport != NULL)
 446                 *port = ftp_strdup(tport);
 447         if (*path == NULL) {
 448                 const char *emptypath = "/";
 449                 if (*type == FTP_URL_T) /* skip first / for ftp URLs */
 450                         emptypath++;
 451                 *path = ftp_strdup(emptypath);
 452         }
 453
 454         DPRINTF("parse_url: user `%s' pass `%s' host %s port %s(%d) "
 455             "path `%s'\n",
 456             *user ? *user : "<null>", *pass ? *pass : "<null>",
 457             *host ? *host : "<null>", *port ? *port : "<null>",
 458             *portnum ? *portnum : -1, *path ? *path : "<null>");
 459
 460         return (0);
 461 }
 462
 463 sigjmp_buf      httpabort;
 464
 465 /*
 466  * Retrieve URL, via a proxy if necessary, using HTTP.
 467  * If proxyenv is set, use that for the proxy, otherwise try ftp_proxy or
 468  * http_proxy as appropriate.
 469  * Supports HTTP redirects.
 470  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
 471  * is still open (e.g, ftp xfer with trailing /)
 472  */
 473 static int
 474 fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth)
 475 {
 476         struct addrinfo         hints, *res, *res0 = NULL;
 477         int                     error;
 478         char                    hbuf[NI_MAXHOST];
 479         sigfunc volatile        oldintr;
 480         sigfunc volatile        oldintp;
 481         int volatile            s;
 482         struct stat             sb;
 483         int volatile            ischunked;
 484         int volatile            isproxy;
 485         int volatile            rval;
 486         int volatile            hcode;
 487         size_t                  len;
 488         static size_t           bufsize;
 489         static char             *xferbuf;
 490         const char              *cp, *token;
 491         char                    *ep;
 492         char                    buf[FTPBUFLEN];
 493         const char              *errormsg;
 494         char                    *volatile savefile;
 495         char                    *volatile auth;
 496         char                    *volatile location;
 497         char                    *volatile message;
 498         char                    *user, *pass, *host, *port, *path;
 499         char                    *volatile decodedpath;
 500         char                    *puser, *ppass, *useragent;
 501         off_t                   hashbytes, rangestart, rangeend, entitylen;
 502         int                     (*volatile closefunc)(FILE *);
 503         FILE                    *volatile fin;
 504         FILE                    *volatile fout;
 505         time_t                  mtime;
 506         url_t                   urltype;
 507         in_port_t               portnum;
 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         user = pass = host = path = decodedpath = puser = ppass = NULL;
 518
 519         if (parse_url(url, "URL", &urltype, &user, &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         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         } else {
 561                 DPRINTF("savefile `%s'\n", savefile);
 562         }
 563
 564         restart_point = 0;
 565         filesize = -1;
 566         rangestart = rangeend = entitylen = -1;
 567         mtime = -1;
 568         if (restartautofetch) {
 569                 if (strcmp(savefile, "-") != 0 && *savefile != '|' &&
 570                     stat(savefile, &sb) == 0)
 571                         restart_point = sb.st_size;
 572         }
 573         if (urltype == FILE_URL_T) {            /* file:// URLs */
 574                 direction = "copied";
 575                 fin = fopen(decodedpath, "r");
 576                 if (fin == NULL) {
 577                         warn("Can't open `%s'", decodedpath);
 578                         goto cleanup_fetch_url;
 579                 }
 580                 if (fstat(fileno(fin), &sb) == 0) {
 581                         mtime = sb.st_mtime;
 582                         filesize = sb.st_size;
 583                 }
 584                 if (restart_point) {
 585                         if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
 586                                 warn("Can't seek to restart `%s'",
 587                                     decodedpath);
 588                                 goto cleanup_fetch_url;
 589                         }
 590                 }
 591                 if (verbose) {
 592                         fprintf(ttyout, "Copying %s", decodedpath);
 593                         if (restart_point)
 594                                 fprintf(ttyout, " (restarting at " LLF ")",
 595                                     (LLT)restart_point);
 596                         fputs("\n", ttyout);
 597                 }
 598         } else {                                /* ftp:// or http:// URLs */
 599                 char *leading;
 600                 int hasleading;
 601
 602                 if (proxyenv == NULL) {
 603                         if (urltype == HTTP_URL_T)
 604                                 proxyenv = getoptionvalue("http_proxy");
 605                         else if (urltype == FTP_URL_T)
 606                                 proxyenv = getoptionvalue("ftp_proxy");
 607                 }
 608                 direction = "retrieved";
 609                 if (! EMPTYSTRING(proxyenv)) {                  /* use proxy */
 610                         url_t purltype;
 611                         char *phost, *ppath;
 612                         char *pport, *no_proxy;
 613
 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                                 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 =
 631                                                     strtol(np + 1, &ep, 10);
 632                                                 if (*ep != '\0')
 633                                                         continue;
 634                                                 if (np_port != portnum)
 635                                                         continue;
 636                                         }
 637                                         plen = strlen(cp);
 638                                         if (hlen < plen)
 639                                                 continue;
 640                                         if (strncasecmp(host + hlen - plen,
 641                                             cp, plen) == 0) {
 642                                                 isproxy = 0;
 643                                                 break;
 644                                         }
 645                                 }
 646                                 FREEPTR(np_copy);
 647                                 if (isproxy == 0 && urltype == FTP_URL_T) {
 648                                         rval = fetch_ftp(url);
 649                                         goto cleanup_fetch_url;
 650                                 }
 651                         }
 652
 653                         if (isproxy) {
 654                                 if (restart_point) {
 655                                         warnx("Can't restart via proxy URL `%s'",
 656                                             proxyenv);
 657                                         goto cleanup_fetch_url;
 658                                 }
 659                                 if (parse_url(proxyenv, "proxy URL", &purltype,
 660                                     &puser, &ppass, &phost, &pport, &portnum,
 661                                     &ppath) == -1)
 662                                         goto cleanup_fetch_url;
 663
 664                                 if ((purltype != HTTP_URL_T
 665                                      && purltype != FTP_URL_T) ||
 666                                     EMPTYSTRING(phost) ||
 667                                     (! EMPTYSTRING(ppath)
 668                                      && strcmp(ppath, "/") != 0)) {
 669                                         warnx("Malformed proxy URL `%s'",
 670                                             proxyenv);
 671                                         FREEPTR(phost);
 672                                         FREEPTR(pport);
 673                                         FREEPTR(ppath);
 674                                         goto cleanup_fetch_url;
 675                                 }
 676                                 if (isipv6addr(host) &&
 677                                     strchr(host, '%') != NULL) {
 678                                         warnx(
 679 "Scoped address notation `%s' disallowed via web proxy",
 680                                             host);
 681                                         FREEPTR(phost);
 682                                         FREEPTR(pport);
 683                                         FREEPTR(ppath);
 684                                         goto cleanup_fetch_url;
 685                                 }
 686
 687                                 FREEPTR(host);
 688                                 host = phost;
 689                                 FREEPTR(port);
 690                                 port = pport;
 691                                 FREEPTR(path);
 692                                 path = ftp_strdup(url);
 693                                 FREEPTR(ppath);
 694                         }
 695                 } /* ! EMPTYSTRING(proxyenv) */
 696
 697                 memset(&hints, 0, sizeof(hints));
 698                 hints.ai_flags = 0;
 699                 hints.ai_family = family;
 700                 hints.ai_socktype = SOCK_STREAM;
 701                 hints.ai_protocol = 0;
 702                 error = getaddrinfo(host, NULL, &hints, &res0);
 703                 if (error) {
 704                         warnx("Can't lookup `%s': %s", host,
 705                             (error == EAI_SYSTEM) ? strerror(errno)
 706                                                   : gai_strerror(error));
 707                         goto cleanup_fetch_url;
 708                 }
 709                 if (res0->ai_canonname)
 710                         host = res0->ai_canonname;
 711
 712                 s = -1;
 713                 for (res = res0; res; res = res->ai_next) {
 714                         ai_unmapped(res);
 715                         if (getnameinfo(res->ai_addr, res->ai_addrlen,
 716                             hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
 717                                 strlcpy(hbuf, "?", sizeof(hbuf));
 718
 719                         if (verbose && res0->ai_next) {
 720                                 fprintf(ttyout, "Trying %s...\n", hbuf);
 721                         }
 722
 723                         ((struct sockaddr_in *)res->ai_addr)->sin_port =
 724                             htons(portnum);
 725                         s = socket(res->ai_family, SOCK_STREAM,
 726                             res->ai_protocol);
 727                         if (s < 0) {
 728                                 warn(
 729                                   "Can't create socket for connection to `%s'",
 730                                     hbuf);
 731                                 continue;
 732                         }
 733
 734                         if (ftp_connect(s, res->ai_addr, res->ai_addrlen) < 0) {
 735                                 close(s);
 736                                 s = -1;
 737                                 continue;
 738                         }
 739
 740                         /* success */
 741                         break;
 742                 }
 743
 744                 if (s < 0) {
 745                         warnx("Can't connect to `%s'", host);
 746                         goto cleanup_fetch_url;
 747                 }
 748
 749                 fin = fdopen(s, "r+");
 750                 /*
 751                  * Construct and send the request.
 752                  */
 753                 if (verbose)
 754                         fprintf(ttyout, "Requesting %s\n", url);
 755                 leading = "  (";
 756                 hasleading = 0;
 757                 if (isproxy) {
 758                         if (verbose) {
 759                                 fprintf(ttyout, "%svia %s:%s", leading,
 760                                     host, port);
 761                                 leading = ", ";
 762                                 hasleading++;
 763                         }
 764                         fprintf(fin, "GET %s HTTP/1.0\r\n", path);
 765                         if (flushcache)
 766                                 fprintf(fin, "Pragma: no-cache\r\n");
 767                 } else {
 768                         fprintf(fin, "GET %s HTTP/1.1\r\n", path);
 769                         if (strchr(host, ':')) {
 770                                 char *h, *p;
 771
 772                                 /*
 773                                  * strip off IPv6 scope identifier, since it is
 774                                  * local to the node
 775                                  */
 776                                 h = ftp_strdup(host);
 777                                 if (isipv6addr(h) &&
 778                                     (p = strchr(h, '%')) != NULL) {
 779                                         *p = '\0';
 780                                 }
 781                                 fprintf(fin, "Host: [%s]", h);
 782                                 free(h);
 783                         } else
 784                                 fprintf(fin, "Host: %s", host);
 785                         if (portnum != HTTP_PORT)
 786                                 fprintf(fin, ":%u", portnum);
 787                         fprintf(fin, "\r\n");
 788                         fprintf(fin, "Accept: */*\r\n");
 789                         fprintf(fin, "Connection: close\r\n");
 790                         if (restart_point) {
 791                                 fputs(leading, ttyout);
 792                                 fprintf(fin, "Range: bytes=" LLF "-\r\n",
 793                                     (LLT)restart_point);
 794                                 fprintf(ttyout, "restarting at " LLF,
 795                                     (LLT)restart_point);
 796                                 leading = ", ";
 797                                 hasleading++;
 798                         }
 799                         if (flushcache)
 800                                 fprintf(fin, "Cache-Control: no-cache\r\n");
 801                 }
 802                 if ((useragent=getenv("FTPUSERAGENT")) != NULL) {
 803                         fprintf(fin, "User-Agent: %s\r\n", useragent);
 804                 } else {
 805                         fprintf(fin, "User-Agent: %s/%s\r\n",
 806                             FTP_PRODUCT, FTP_VERSION);
 807                 }
 808                 if (wwwauth) {
 809                         if (verbose) {
 810                                 fprintf(ttyout, "%swith authorization",
 811                                     leading);
 812                                 leading = ", ";
 813                                 hasleading++;
 814                         }
 815                         fprintf(fin, "Authorization: %s\r\n", wwwauth);
 816                 }
 817                 if (proxyauth) {
 818                         if (verbose) {
 819                                 fprintf(ttyout,
 820                                     "%swith proxy authorization", leading);
 821                                 leading = ", ";
 822                                 hasleading++;
 823                         }
 824                         fprintf(fin, "Proxy-Authorization: %s\r\n", proxyauth);
 825                 }
 826                 if (verbose && hasleading)
 827                         fputs(")\n", ttyout);
 828                 fprintf(fin, "\r\n");
 829                 if (fflush(fin) == EOF) {
 830                         warn("Writing HTTP request");
 831                         goto cleanup_fetch_url;
 832                 }
 833
 834                                 /* Read the response */
 835                 len = getline(fin, buf, sizeof(buf), &errormsg);
 836                 if (len < 0) {
 837                         if (*errormsg == '\n')
 838                                 errormsg++;
 839                         warnx("Receiving HTTP reply: %s", errormsg);
 840                         goto cleanup_fetch_url;
 841                 }
 842                 while (len > 0 && (ISLWS(buf[len-1])))
 843                         buf[--len] = '\0';
 844                 DPRINTF("received `%s'\n", buf);
 845
 846                                 /* Determine HTTP response code */
 847                 cp = strchr(buf, ' ');
 848                 if (cp == NULL)
 849                         goto improper;
 850                 else
 851                         cp++;
 852                 hcode = strtol(cp, &ep, 10);
 853                 if (*ep != '\0' && !isspace((unsigned char)*ep))
 854                         goto improper;
 855                 message = ftp_strdup(cp);
 856
 857                                 /* Read the rest of the header. */
 858                 while (1) {
 859                         len = getline(fin, buf, sizeof(buf), &errormsg);
 860                         if (len < 0) {
 861                                 if (*errormsg == '\n')
 862                                         errormsg++;
 863                                 warnx("Receiving HTTP reply: %s", errormsg);
 864                                 goto cleanup_fetch_url;
 865                         }
 866                         while (len > 0 && (ISLWS(buf[len-1])))
 867                                 buf[--len] = '\0';
 868                         if (len == 0)
 869                                 break;
 870                         DPRINTF("received `%s'\n", buf);
 871
 872                 /*
 873                  * Look for some headers
 874                  */
 875
 876                         cp = buf;
 877
 878                         if (match_token(&cp, "Content-Length:")) {
 879                                 filesize = STRTOLL(cp, &ep, 10);
 880                                 if (filesize < 0 || *ep != '\0')
 881                                         goto improper;
 882                                 DPRINTF("parsed len as: " LLF "\n",
 883                                     (LLT)filesize);
 884
 885                         } else if (match_token(&cp, "Content-Range:")) {
 886                                 if (! match_token(&cp, "bytes"))
 887                                         goto improper;
 888
 889                                 if (*cp == '*')
 890                                         cp++;
 891                                 else {
 892                                         rangestart = STRTOLL(cp, &ep, 10);
 893                                         if (rangestart < 0 || *ep != '-')
 894                                                 goto improper;
 895                                         cp = ep + 1;
 896                                         rangeend = STRTOLL(cp, &ep, 10);
 897                                         if (rangeend < 0 || rangeend < rangestart)
 898                                                 goto improper;
 899                                         cp = ep;
 900                                 }
 901                                 if (*cp != '/')
 902                                         goto improper;
 903                                 cp++;
 904                                 if (*cp == '*')
 905                                         cp++;
 906                                 else {
 907                                         entitylen = STRTOLL(cp, &ep, 10);
 908                                         if (entitylen < 0)
 909                                                 goto improper;
 910                                         cp = ep;
 911                                 }
 912                                 if (*cp != '\0')
 913                                         goto improper;
 914
 915 #ifndef NO_DEBUG
 916                                 if (ftp_debug) {
 917                                         fprintf(ttyout, "parsed range as: ");
 918                                         if (rangestart == -1)
 919                                                 fprintf(ttyout, "*");
 920                                         else
 921                                                 fprintf(ttyout, LLF "-" LLF,
 922                                                     (LLT)rangestart,
 923                                                     (LLT)rangeend);
 924                                         fprintf(ttyout, "/" LLF "\n", (LLT)entitylen);
 925                                 }
 926 #endif
 927                                 if (! restart_point) {
 928                                         warnx(
 929                                     "Received unexpected Content-Range header");
 930                                         goto cleanup_fetch_url;
 931                                 }
 932
 933                         } else if (match_token(&cp, "Last-Modified:")) {
 934                                 struct tm parsed;
 935                                 char *t;
 936
 937                                 memset(&parsed, 0, sizeof(parsed));
 938                                                         /* RFC1123 */
 939                                 if ((t = strptime(cp,
 940                                                 "%a, %d %b %Y %H:%M:%S GMT",
 941                                                 &parsed))
 942                                                         /* RFC0850 */
 943                                     || (t = strptime(cp,
 944                                                 "%a, %d-%b-%y %H:%M:%S GMT",
 945                                                 &parsed))
 946                                                         /* asctime */
 947                                     || (t = strptime(cp,
 948                                                 "%a, %b %d %H:%M:%S %Y",
 949                                                 &parsed))) {
 950                                         parsed.tm_isdst = -1;
 951                                         if (*t == '\0')
 952                                                 mtime = timegm(&parsed);
 953 #ifndef NO_DEBUG
 954                                         if (ftp_debug && mtime != -1) {
 955                                                 fprintf(ttyout,
 956                                                     "parsed date as: %s",
 957                                                 rfc2822time(localtime(&mtime)));
 958                                         }
 959 #endif
 960                                 }
 961
 962                         } else if (match_token(&cp, "Location:")) {
 963                                 location = ftp_strdup(cp);
 964                                 DPRINTF("parsed location as `%s'\n", cp);
 965
 966                         } else if (match_token(&cp, "Transfer-Encoding:")) {
 967                                 if (match_token(&cp, "binary")) {
 968                                         warnx(
 969                         "Bogus transfer encoding `binary' (fetching anyway)");
 970                                         continue;
 971                                 }
 972                                 if (! (token = match_token(&cp, "chunked"))) {
 973                                         warnx(
 974                                     "Unsupported transfer encoding `%s'",
 975                                             token);
 976                                         goto cleanup_fetch_url;
 977                                 }
 978                                 ischunked++;
 979                                 DPRINTF("using chunked encoding\n");
 980
 981                         } else if (match_token(&cp, "Proxy-Authenticate:")
 982                                 || match_token(&cp, "WWW-Authenticate:")) {
 983                                 if (! (token = match_token(&cp, "Basic"))) {
 984                                         DPRINTF(
 985                                 "skipping unknown auth scheme `%s'\n",
 986                                                     token);
 987                                         continue;
 988                                 }
 989                                 FREEPTR(auth);
 990                                 auth = ftp_strdup(token);
 991                                 DPRINTF("parsed auth as `%s'\n", cp);
 992                         }
 993
 994                 }
 995                                 /* finished parsing header */
 996
 997                 switch (hcode) {
 998                 case 200:
 999                         break;
1000                 case 206:
1001                         if (! restart_point) {
1002                                 warnx("Not expecting partial content header");
1003                                 goto cleanup_fetch_url;
1004                         }
1005                         break;
1006                 case 300:
1007                 case 301:
1008                 case 302:
1009                 case 303:
1010                 case 305:
1011                 case 307:
1012                         if (EMPTYSTRING(location)) {
1013                                 warnx(
1014                                 "No redirection Location provided by server");
1015                                 goto cleanup_fetch_url;
1016                         }
1017                         if (redirect_loop++ > 5) {
1018                                 warnx("Too many redirections requested");
1019                                 goto cleanup_fetch_url;
1020                         }
1021                         if (hcode == 305) {
1022                                 if (verbose)
1023                                         fprintf(ttyout, "Redirected via %s\n",
1024                                             location);
1025                                 rval = fetch_url(url, location,
1026                                     proxyauth, wwwauth);
1027                         } else {
1028                                 if (verbose)
1029                                         fprintf(ttyout, "Redirected to %s\n",
1030                                             location);
1031                                 rval = go_fetch(location);
1032                         }
1033                         goto cleanup_fetch_url;
1034 #ifndef NO_AUTH
1035                 case 401:
1036                 case 407:
1037                     {
1038                         char **authp;
1039                         char *auser, *apass;
1040
1041                         if (hcode == 401) {
1042                                 authp = &wwwauth;
1043                                 auser = user;
1044                                 apass = pass;
1045                         } else {
1046                                 authp = &proxyauth;
1047                                 auser = puser;
1048                                 apass = ppass;
1049                         }
1050                         if (verbose || *authp == NULL ||
1051                             auser == NULL || apass == NULL)
1052                                 fprintf(ttyout, "%s\n", message);
1053                         if (EMPTYSTRING(auth)) {
1054                                 warnx(
1055                             "No authentication challenge provided by server");
1056                                 goto cleanup_fetch_url;
1057                         }
1058                         if (*authp != NULL) {
1059                                 char reply[10];
1060
1061                                 fprintf(ttyout,
1062                                     "Authorization failed. Retry (y/n)? ");
1063                                 if (getline(stdin, reply, sizeof(reply), NULL)
1064                                     < 0) {
1065                                         goto cleanup_fetch_url;
1066                                 }
1067                                 if (tolower((unsigned char)reply[0]) != 'y')
1068                                         goto cleanup_fetch_url;
1069                                 auser = NULL;
1070                                 apass = NULL;
1071                         }
1072                         if (auth_url(auth, authp, auser, apass) == 0) {
1073                                 rval = fetch_url(url, proxyenv,
1074                                     proxyauth, wwwauth);
1075                                 memset(*authp, 0, strlen(*authp));
1076                                 FREEPTR(*authp);
1077                         }
1078                         goto cleanup_fetch_url;
1079                     }
1080 #endif
1081                 default:
1082                         if (message)
1083                                 warnx("Error retrieving file `%s'", message);
1084                         else
1085                                 warnx("Unknown error retrieving file");
1086                         goto cleanup_fetch_url;
1087                 }
1088         }               /* end of ftp:// or http:// specific setup */
1089
1090                         /* Open the output file. */
1091         if (strcmp(savefile, "-") == 0) {
1092                 fout = stdout;
1093         } else if (*savefile == '|') {
1094                 oldintp = xsignal(SIGPIPE, SIG_IGN);
1095                 fout = popen(savefile + 1, "w");
1096                 if (fout == NULL) {
1097                         warn("Can't execute `%s'", savefile + 1);
1098                         goto cleanup_fetch_url;
1099                 }
1100                 closefunc = pclose;
1101         } else {
1102                 if ((rangeend != -1 && rangeend <= restart_point) ||
1103                     (rangestart == -1 && filesize != -1 && filesize <= restart_point)) {
1104                         /* already done */
1105                         if (verbose)
1106                                 fprintf(ttyout, "already done\n");
1107                         rval = 0;
1108                         goto cleanup_fetch_url;
1109                 }
1110                 if (restart_point && rangestart != -1) {
1111                         if (entitylen != -1)
1112                                 filesize = entitylen;
1113                         if (rangestart != restart_point) {
1114                                 warnx(
1115                                     "Size of `%s' differs from save file `%s'",
1116                                     url, savefile);
1117                                 goto cleanup_fetch_url;
1118                         }
1119                         fout = fopen(savefile, "a");
1120                 } else
1121                         fout = fopen(savefile, "w");
1122                 if (fout == NULL) {
1123                         warn("Can't open `%s'", savefile);
1124                         goto cleanup_fetch_url;
1125                 }
1126                 closefunc = fclose;
1127         }
1128
1129                         /* Trap signals */
1130         if (sigsetjmp(httpabort, 1))
1131                 goto cleanup_fetch_url;
1132         (void)xsignal(SIGQUIT, psummary);
1133         oldintr = xsignal(SIGINT, aborthttp);
1134
1135         if (rcvbuf_size > bufsize) {
1136                 if (xferbuf)
1137                         (void)free(xferbuf);
1138                 bufsize = rcvbuf_size;
1139                 xferbuf = ftp_malloc(bufsize);
1140         }
1141
1142         bytes = 0;
1143         hashbytes = mark;
1144         progressmeter(-1);
1145
1146                         /* Finally, suck down the file. */
1147         do {
1148                 long chunksize;
1149                 short lastchunk;
1150
1151                 chunksize = 0;
1152                 lastchunk = 0;
1153                                         /* read chunk-size */
1154                 if (ischunked) {
1155                         if (fgets(xferbuf, bufsize, fin) == NULL) {
1156                                 warnx("Unexpected EOF reading chunk-size");
1157                                 goto cleanup_fetch_url;
1158                         }
1159                         errno = 0;
1160                         chunksize = strtol(xferbuf, &ep, 16);
1161                         if (ep == xferbuf) {
1162                                 warnx("Invalid chunk-size");
1163                                 goto cleanup_fetch_url;
1164                         }
1165                         if (errno == ERANGE || chunksize < 0) {
1166                                 errno = ERANGE;
1167                                 warn("Chunk-size `%.*s'",
1168                                     (int)(ep-xferbuf), xferbuf);
1169                                 goto cleanup_fetch_url;
1170                         }
1171
1172                                 /*
1173                                  * XXX: Work around bug in Apache 1.3.9 and
1174                                  *      1.3.11, which incorrectly put trailing
1175                                  *      space after the chunk-size.
1176                                  */
1177                         while (*ep == ' ')
1178                                 ep++;
1179
1180                                         /* skip [ chunk-ext ] */
1181                         if (*ep == ';') {
1182                                 while (*ep && *ep != '\r')
1183                                         ep++;
1184                         }
1185
1186                         if (strcmp(ep, "\r\n") != 0) {
1187                                 warnx("Unexpected data following chunk-size");
1188                                 goto cleanup_fetch_url;
1189                         }
1190                         DPRINTF("got chunk-size of " LLF "\n", (LLT)chunksize);
1191                         if (chunksize == 0) {
1192                                 lastchunk = 1;
1193                                 goto chunkdone;
1194                         }
1195                 }
1196                                         /* transfer file or chunk */
1197                 while (1) {
1198                         struct timeval then, now, td;
1199                         off_t bufrem;
1200
1201                         if (rate_get)
1202                                 (void)gettimeofday(&then, NULL);
1203                         bufrem = rate_get ? rate_get : bufsize;
1204                         if (ischunked)
1205                                 bufrem = MIN(chunksize, bufrem);
1206                         while (bufrem > 0) {
1207                                 len = fread(xferbuf, sizeof(char),
1208                                     MIN(bufsize, bufrem), fin);
1209                                 if (len <= 0)
1210                                         goto chunkdone;
1211                                 bytes += len;
1212                                 bufrem -= len;
1213                                 if (fwrite(xferbuf, sizeof(char), len, fout)
1214                                     != len) {
1215                                         warn("Writing `%s'", savefile);
1216                                         goto cleanup_fetch_url;
1217                                 }
1218                                 if (hash && !progress) {
1219                                         while (bytes >= hashbytes) {
1220                                                 (void)putc('#', ttyout);
1221                                                 hashbytes += mark;
1222                                         }
1223                                         (void)fflush(ttyout);
1224                                 }
1225                                 if (ischunked) {
1226                                         chunksize -= len;
1227                                         if (chunksize <= 0)
1228                                                 break;
1229                                 }
1230                         }
1231                         if (rate_get) {
1232                                 while (1) {
1233                                         (void)gettimeofday(&now, NULL);
1234                                         timersub(&now, &then, &td);
1235                                         if (td.tv_sec > 0)
1236                                                 break;
1237                                         usleep(1000000 - td.tv_usec);
1238                                 }
1239                         }
1240                         if (ischunked && chunksize <= 0)
1241                                 break;
1242                 }
1243                                         /* read CRLF after chunk*/
1244  chunkdone:
1245                 if (ischunked) {
1246                         if (fgets(xferbuf, bufsize, fin) == NULL) {
1247                                 warnx("Unexpected EOF reading chunk CRLF");
1248                                 goto cleanup_fetch_url;
1249                         }
1250                         if (strcmp(xferbuf, "\r\n") != 0) {
1251                                 warnx("Unexpected data following chunk");
1252                                 goto cleanup_fetch_url;
1253                         }
1254                         if (lastchunk)
1255                                 break;
1256                 }
1257         } while (ischunked);
1258
1259 /* XXX: deal with optional trailer & CRLF here? */
1260
1261         if (hash && !progress && bytes > 0) {
1262                 if (bytes < mark)
1263                         (void)putc('#', ttyout);
1264                 (void)putc('\n', ttyout);
1265         }
1266         if (ferror(fin)) {
1267                 warn("Reading file");
1268                 goto cleanup_fetch_url;
1269         }
1270         progressmeter(1);
1271         (void)fflush(fout);
1272         if (closefunc == fclose && mtime != -1) {
1273                 struct timeval tval[2];
1274
1275                 (void)gettimeofday(&tval[0], NULL);
1276                 tval[1].tv_sec = mtime;
1277                 tval[1].tv_usec = 0;
1278                 (*closefunc)(fout);
1279                 fout = NULL;
1280
1281                 if (utimes(savefile, tval) == -1) {
1282                         fprintf(ttyout,
1283                             "Can't change modification time to %s",
1284                             rfc2822time(localtime(&mtime)));
1285                 }
1286         }
1287         if (bytes > 0)
1288                 ptransfer(0);
1289         bytes = 0;
1290
1291         rval = 0;
1292         goto cleanup_fetch_url;
1293
1294  improper:
1295         warnx("Improper response from `%s'", host);
1296
1297  cleanup_fetch_url:
1298         if (oldintr)
1299                 (void)xsignal(SIGINT, oldintr);
1300         if (oldintp)
1301                 (void)xsignal(SIGPIPE, oldintp);
1302         if (fin != NULL)
1303                 fclose(fin);
1304         else if (s != -1)
1305                 close(s);
1306         if (closefunc != NULL && fout != NULL)
1307                 (*closefunc)(fout);
1308         if (res0)
1309                 freeaddrinfo(res0);
1310         FREEPTR(savefile);
1311         FREEPTR(user);
1312         if (pass != NULL)
1313                 memset(pass, 0, strlen(pass));
1314         FREEPTR(pass);
1315         FREEPTR(host);
1316         FREEPTR(port);
1317         FREEPTR(path);
1318         FREEPTR(decodedpath);
1319         FREEPTR(puser);
1320         if (ppass != NULL)
1321                 memset(ppass, 0, strlen(ppass));
1322         FREEPTR(ppass);
1323         FREEPTR(auth);
1324         FREEPTR(location);
1325         FREEPTR(message);
1326         return (rval);
1327 }
1328
1329 /*
1330  * Abort a HTTP retrieval
1331  */
1332 void
1333 aborthttp(int notused)
1334 {
1335         char msgbuf[100];
1336         size_t len;
1337
1338         sigint_raised = 1;
1339         alarmtimer(0);
1340         len = strlcpy(msgbuf, "\nHTTP fetch aborted.\n", sizeof(msgbuf));
1341         write(fileno(ttyout), msgbuf, len);
1342         siglongjmp(httpabort, 1);
1343 }
1344
1345 /*
1346  * Retrieve ftp URL or classic ftp argument using FTP.
1347  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1348  * is still open (e.g, ftp xfer with trailing /)
1349  */
1350 static int
1351 fetch_ftp(const char *url)
1352 {
1353         char            *cp, *xargv[5], rempath[MAXPATHLEN];
1354         char            *host, *path, *dir, *file, *user, *pass;
1355         char            *port;
1356         int              dirhasglob, filehasglob, rval, type, xargc;
1357         int              oanonftp, oautologin;
1358         in_port_t        portnum;
1359         url_t            urltype;
1360
1361         host = path = dir = file = user = pass = NULL;
1362         port = NULL;
1363         rval = 1;
1364         type = TYPE_I;
1365
1366         if (STRNEQUAL(url, FTP_URL)) {
1367                 if ((parse_url(url, "URL", &urltype, &user, &pass,
1368                     &host, &port, &portnum, &path) == -1) ||
1369                     (user != NULL && *user == '\0') ||
1370                     EMPTYSTRING(host)) {
1371                         warnx("Invalid URL `%s'", url);
1372                         goto cleanup_fetch_ftp;
1373                 }
1374                 /*
1375                  * Note: Don't url_decode(path) here.  We need to keep the
1376                  * distinction between "/" and "%2F" until later.
1377                  */
1378
1379                                         /* check for trailing ';type=[aid]' */
1380                 if (! EMPTYSTRING(path) && (cp = strrchr(path, ';')) != NULL) {
1381                         if (strcasecmp(cp, ";type=a") == 0)
1382                                 type = TYPE_A;
1383                         else if (strcasecmp(cp, ";type=i") == 0)
1384                                 type = TYPE_I;
1385                         else if (strcasecmp(cp, ";type=d") == 0) {
1386                                 warnx(
1387                             "Directory listing via a URL is not supported");
1388                                 goto cleanup_fetch_ftp;
1389                         } else {
1390                                 warnx("Invalid suffix `%s' in URL `%s'", cp,
1391                                     url);
1392                                 goto cleanup_fetch_ftp;
1393                         }
1394                         *cp = 0;
1395                 }
1396         } else {                        /* classic style `[user@]host:[file]' */
1397                 urltype = CLASSIC_URL_T;
1398                 host = ftp_strdup(url);
1399                 cp = strchr(host, '@');
1400                 if (cp != NULL) {
1401                         *cp = '\0';
1402                         user = host;
1403                         anonftp = 0;    /* disable anonftp */
1404                         host = ftp_strdup(cp + 1);
1405                 }
1406                 cp = strchr(host, ':');
1407                 if (cp != NULL) {
1408                         *cp = '\0';
1409                         path = ftp_strdup(cp + 1);
1410                 }
1411         }
1412         if (EMPTYSTRING(host))
1413                 goto cleanup_fetch_ftp;
1414
1415                         /* Extract the file and (if present) directory name. */
1416         dir = path;
1417         if (! EMPTYSTRING(dir)) {
1418                 /*
1419                  * If we are dealing with classic `[user@]host:[path]' syntax,
1420                  * then a path of the form `/file' (resulting from input of the
1421                  * form `host:/file') means that we should do "CWD /" before
1422                  * retrieving the file.  So we set dir="/" and file="file".
1423                  *
1424                  * But if we are dealing with URLs like `ftp://host/path' then
1425                  * a path of the form `/file' (resulting from a URL of the form
1426                  * `ftp://host//file') means that we should do `CWD ' (with an
1427                  * empty argument) before retrieving the file.  So we set
1428                  * dir="" and file="file".
1429                  *
1430                  * If the path does not contain / at all, we set dir=NULL.
1431                  * (We get a path without any slashes if we are dealing with
1432                  * classic `[user@]host:[file]' or URL `ftp://host/file'.)
1433                  *
1434                  * In all other cases, we set dir to a string that does not
1435                  * include the final '/' that separates the dir part from the
1436                  * file part of the path.  (This will be the empty string if
1437                  * and only if we are dealing with a path of the form `/file'
1438                  * resulting from an URL of the form `ftp://host//file'.)
1439                  */
1440                 cp = strrchr(dir, '/');
1441                 if (cp == dir && urltype == CLASSIC_URL_T) {
1442                         file = cp + 1;
1443                         dir = "/";
1444                 } else if (cp != NULL) {
1445                         *cp++ = '\0';
1446                         file = cp;
1447                 } else {
1448                         file = dir;
1449                         dir = NULL;
1450                 }
1451         } else
1452                 dir = NULL;
1453         if (urltype == FTP_URL_T && file != NULL) {
1454                 url_decode(file);
1455                 /* but still don't url_decode(dir) */
1456         }
1457         DPRINTF("fetch_ftp: user `%s' pass `%s' host %s port %s "
1458             "path `%s' dir `%s' file `%s'\n",
1459             user ? user : "<null>", pass ? pass : "<null>",
1460             host ? host : "<null>", port ? port : "<null>",
1461             path ? path : "<null>",
1462             dir ? dir : "<null>", file ? file : "<null>");
1463
1464         dirhasglob = filehasglob = 0;
1465         if (doglob && urltype == CLASSIC_URL_T) {
1466                 if (! EMPTYSTRING(dir) && strpbrk(dir, "*?[]{}") != NULL)
1467                         dirhasglob = 1;
1468                 if (! EMPTYSTRING(file) && strpbrk(file, "*?[]{}") != NULL)
1469                         filehasglob = 1;
1470         }
1471
1472                         /* Set up the connection */
1473         oanonftp = anonftp;
1474         if (connected)
1475                 disconnect(0, NULL);
1476         anonftp = oanonftp;
1477         xargv[0] = (char *)getprogname();       /* XXX discards const */
1478         xargv[1] = host;
1479         xargv[2] = NULL;
1480         xargc = 2;
1481         if (port) {
1482                 xargv[2] = port;
1483                 xargv[3] = NULL;
1484                 xargc = 3;
1485         }
1486         oautologin = autologin;
1487                 /* don't autologin in setpeer(), use ftp_login() below */
1488         autologin = 0;
1489         setpeer(xargc, xargv);
1490         autologin = oautologin;
1491         if ((connected == 0) ||
1492             (connected == 1 && !ftp_login(host, user, pass))) {
1493                 warnx("Can't connect or login to host `%s'", host);
1494                 goto cleanup_fetch_ftp;
1495         }
1496
1497         switch (type) {
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", type);
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 RFC3986 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 RFC3986 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("dir `%s', nextpart `%s'\n",
1588                             dir ? dir : "<null>",
1589                             nextpart ? nextpart : "<null>");
1590                         if (urltype == FTP_URL_T || *dir != '\0') {
1591                                 xargv[0] = "cd";
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 "     RFC3986 to support the empty directory in the URL pathname (`//'),\n"
1602 "     conflicts with the server's conformance to RFC0959.\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         xargv[0] = "get";
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                         xargv[0] = "mreget";
1636                 else
1637                         xargv[0] = "mget";
1638                 mget(xargc, xargv);
1639                 interactive = ointeractive;
1640         } else {
1641                 if (outfile == NULL) {
1642                         cp = strrchr(file, '/');        /* find savefile */
1643                         if (cp != NULL)
1644                                 outfile = cp + 1;
1645                         else
1646                                 outfile = file;
1647                 }
1648                 xargv[2] = (char *)outfile;
1649                 xargv[3] = NULL;
1650                 xargc++;
1651                 if (restartautofetch)
1652                         reget(xargc, xargv);
1653                 else
1654                         get(xargc, xargv);
1655         }
1656
1657         if ((code / 100) == COMPLETE)
1658                 rval = 0;
1659
1660  cleanup_fetch_ftp:
1661         FREEPTR(port);
1662         FREEPTR(host);
1663         FREEPTR(path);
1664         FREEPTR(user);
1665         if (pass)
1666                 memset(pass, 0, strlen(pass));
1667         FREEPTR(pass);
1668         return (rval);
1669 }
1670
1671 /*
1672  * Retrieve the given file to outfile.
1673  * Supports arguments of the form:
1674  *      "host:path", "ftp://host/path"  if $ftpproxy, call fetch_url() else
1675  *                                      call fetch_ftp()
1676  *      "http://host/path"              call fetch_url() to use HTTP
1677  *      "file:///path"                  call fetch_url() to copy
1678  *      "about:..."                     print a message
1679  *
1680  * Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
1681  * is still open (e.g, ftp xfer with trailing /)
1682  */
1683 static int
1684 go_fetch(const char *url)
1685 {
1686         char *proxy;
1687
1688 #ifndef NO_ABOUT
1689         /*
1690          * Check for about:*
1691          */
1692         if (STRNEQUAL(url, ABOUT_URL)) {
1693                 url += sizeof(ABOUT_URL) -1;
1694                 if (strcasecmp(url, "ftp") == 0 ||
1695                     strcasecmp(url, "tnftp") == 0) {
1696                         fputs(
1697 "This version of ftp has been enhanced by Luke Mewburn <lukem@NetBSD.org>\n"
1698 "for the NetBSD project.  Execute `man ftp' for more details.\n", ttyout);
1699                 } else if (strcasecmp(url, "lukem") == 0) {
1700                         fputs(
1701 "Luke Mewburn is the author of most of the enhancements in this ftp client.\n"
1702 "Please email feedback to <lukem@NetBSD.org>.\n", ttyout);
1703                 } else if (strcasecmp(url, "netbsd") == 0) {
1704                         fputs(
1705 "NetBSD is a freely available and redistributable UNIX-like operating system.\n"
1706 "For more information, see http://www.NetBSD.org/\n", ttyout);
1707                 } else if (strcasecmp(url, "version") == 0) {
1708                         fprintf(ttyout, "Version: %s %s%s\n",
1709                             FTP_PRODUCT, FTP_VERSION,
1710 #ifdef INET6
1711                             ""
1712 #else
1713                             " (-IPv6)"
1714 #endif
1715                         );
1716                 } else {
1717                         fprintf(ttyout, "`%s' is an interesting topic.\n", url);
1718                 }
1719                 fputs("\n", ttyout);
1720                 return (0);
1721         }
1722 #endif
1723
1724         /*
1725          * Check for file:// and http:// URLs.
1726          */
1727         if (STRNEQUAL(url, HTTP_URL) || STRNEQUAL(url, FILE_URL))
1728                 return (fetch_url(url, NULL, NULL, NULL));
1729
1730         /*
1731          * Try FTP URL-style and host:file arguments next.
1732          * If ftpproxy is set with an FTP URL, use fetch_url()
1733          * Othewise, use fetch_ftp().
1734          */
1735         proxy = getoptionvalue("ftp_proxy");
1736         if (!EMPTYSTRING(proxy) && STRNEQUAL(url, FTP_URL))
1737                 return (fetch_url(url, NULL, NULL, NULL));
1738
1739         return (fetch_ftp(url));
1740 }
1741
1742 /*
1743  * Retrieve multiple files from the command line,
1744  * calling go_fetch() for each file.
1745  *
1746  * If an ftp path has a trailing "/", the path will be cd-ed into and
1747  * the connection remains open, and the function will return -1
1748  * (to indicate the connection is alive).
1749  * If an error occurs the return value will be the offset+1 in
1750  * argv[] of the file that caused a problem (i.e, argv[x]
1751  * returns x+1)
1752  * Otherwise, 0 is returned if all files retrieved successfully.
1753  */
1754 int
1755 auto_fetch(int argc, char *argv[])
1756 {
1757         volatile int    argpos, rval;
1758
1759         argpos = rval = 0;
1760
1761         if (sigsetjmp(toplevel, 1)) {
1762                 if (connected)
1763                         disconnect(0, NULL);
1764                 if (rval > 0)
1765                         rval = argpos + 1;
1766                 return (rval);
1767         }
1768         (void)xsignal(SIGINT, intr);
1769         (void)xsignal(SIGPIPE, lostpeer);
1770
1771         /*
1772          * Loop through as long as there's files to fetch.
1773          */
1774         for (; (rval == 0) && (argpos < argc); argpos++) {
1775                 if (strchr(argv[argpos], ':') == NULL)
1776                         break;
1777                 redirect_loop = 0;
1778                 if (!anonftp)
1779                         anonftp = 2;    /* Handle "automatic" transfers. */
1780                 rval = go_fetch(argv[argpos]);
1781                 if (outfile != NULL && strcmp(outfile, "-") != 0
1782                     && outfile[0] != '|')
1783                         outfile = NULL;
1784                 if (rval > 0)
1785                         rval = argpos + 1;
1786         }
1787
1788         if (connected && rval != -1)
1789                 disconnect(0, NULL);
1790         return (rval);
1791 }
1792
1793
1794 /*
1795  * Upload multiple files from the command line.
1796  *
1797  * If an error occurs the return value will be the offset+1 in
1798  * argv[] of the file that caused a problem (i.e, argv[x]
1799  * returns x+1)
1800  * Otherwise, 0 is returned if all files uploaded successfully.
1801  */
1802 int
1803 auto_put(int argc, char **argv, const char *uploadserver)
1804 {
1805         char    *uargv[4], *path, *pathsep;
1806         int      uargc, rval, argpos;
1807         size_t   len;
1808
1809         uargc = 0;
1810         uargv[uargc++] = "mput";
1811         uargv[uargc++] = argv[0];
1812         uargv[2] = uargv[3] = NULL;
1813         pathsep = NULL;
1814         rval = 1;
1815
1816         DPRINTF("auto_put: target `%s'\n", uploadserver);
1817
1818         path = ftp_strdup(uploadserver);
1819         len = strlen(path);
1820         if (path[len - 1] != '/' && path[len - 1] != ':') {
1821                         /*
1822                          * make sure we always pass a directory to auto_fetch
1823                          */
1824                 if (argc > 1) {         /* more than one file to upload */
1825                         len = strlen(uploadserver) + 2; /* path + "/" + "\0" */
1826                         free(path);
1827                         path = (char *)ftp_malloc(len);
1828                         (void)strlcpy(path, uploadserver, len);
1829                         (void)strlcat(path, "/", len);
1830                 } else {                /* single file to upload */
1831                         uargv[0] = "put";
1832                         pathsep = strrchr(path, '/');
1833                         if (pathsep == NULL) {
1834                                 pathsep = strrchr(path, ':');
1835                                 if (pathsep == NULL) {
1836                                         warnx("Invalid URL `%s'", path);
1837                                         goto cleanup_auto_put;
1838                                 }
1839                                 pathsep++;
1840                                 uargv[2] = ftp_strdup(pathsep);
1841                                 pathsep[0] = '/';
1842                         } else
1843                                 uargv[2] = ftp_strdup(pathsep + 1);
1844                         pathsep[1] = '\0';
1845                         uargc++;
1846                 }
1847         }
1848         DPRINTF("auto_put: URL `%s' argv[2] `%s'\n",
1849             path, uargv[2] ? uargv[2] : "<null>");
1850
1851                         /* connect and cwd */
1852         rval = auto_fetch(1, &path);
1853         if(rval >= 0)
1854                 goto cleanup_auto_put;
1855
1856         rval = 0;
1857
1858                         /* target filename provided; upload 1 file */
1859                         /* XXX : is this the best way? */
1860         if (uargc == 3) {
1861                 uargv[1] = argv[0];
1862                 put(uargc, uargv);
1863                 if ((code / 100) != COMPLETE)
1864                         rval = 1;
1865         } else {        /* otherwise a target dir: upload all files to it */
1866                 for(argpos = 0; argv[argpos] != NULL; argpos++) {
1867                         uargv[1] = argv[argpos];
1868                         mput(uargc, uargv);
1869                         if ((code / 100) != COMPLETE) {
1870                                 rval = argpos + 1;
1871                                 break;
1872                         }
1873                 }
1874         }
1875
1876  cleanup_auto_put:
1877         free(path);
1878         FREEPTR(uargv[2]);
1879         return (rval);
1880 }