lib/libfetch/http.c

   1 /*-
   2  * Copyright (c) 2000-2014 Dag-Erling Smørgrav
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 /*
  33  * The following copyright applies to the base64 code:
  34  *
  35  *-
  36  * Copyright 1997 Massachusetts Institute of Technology
  37  *
  38  * Permission to use, copy, modify, and distribute this software and
  39  * its documentation for any purpose and without fee is hereby
  40  * granted, provided that both the above copyright notice and this
  41  * permission notice appear in all copies, that both the above
  42  * copyright notice and this permission notice appear in all
  43  * supporting documentation, and that the name of M.I.T. not be used
  44  * in advertising or publicity pertaining to distribution of the
  45  * software without specific, written prior permission.  M.I.T. makes
  46  * no representations about the suitability of this software for any
  47  * purpose.  It is provided "as is" without express or implied
  48  * warranty.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
  51  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
  52  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  53  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
  54  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  57  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  58  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  59  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  60  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  61  * SUCH DAMAGE.
  62  */
  63
  64 #include <sys/param.h>
  65 #include <sys/socket.h>
  66 #include <sys/time.h>
  67
  68 #include <ctype.h>
  69 #include <err.h>
  70 #include <errno.h>
  71 #include <locale.h>
  72 #include <netdb.h>
  73 #include <stdarg.h>
  74 #include <stdio.h>
  75 #include <stdlib.h>
  76 #include <string.h>
  77 #include <time.h>
  78 #include <unistd.h>
  79
  80 #ifdef WITH_SSL
  81 #include <openssl/md5.h>
  82 #define MD5Init(c) MD5_Init(c)
  83 #define MD5Update(c, data, len) MD5_Update(c, data, len)
  84 #define MD5Final(md, c) MD5_Final(md, c)
  85 #else
  86 #include <md5.h>
  87 #endif
  88
  89 #include <netinet/in.h>
  90 #include <netinet/tcp.h>
  91
  92 #include "fetch.h"
  93 #include "common.h"
  94 #include "httperr.h"
  95
  96 /* Maximum number of redirects to follow */
  97 #define MAX_REDIRECT 20
  98
  99 /* Symbolic names for reply codes we care about */
 100 #define HTTP_OK                 200
 101 #define HTTP_PARTIAL            206
 102 #define HTTP_MOVED_PERM         301
 103 #define HTTP_MOVED_TEMP         302
 104 #define HTTP_SEE_OTHER          303
 105 #define HTTP_NOT_MODIFIED       304
 106 #define HTTP_USE_PROXY          305
 107 #define HTTP_TEMP_REDIRECT      307
 108 #define HTTP_PERM_REDIRECT      308
 109 #define HTTP_NEED_AUTH          401
 110 #define HTTP_NEED_PROXY_AUTH    407
 111 #define HTTP_BAD_RANGE          416
 112 #define HTTP_PROTOCOL_ERROR     999
 113
 114 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
 115                             || (xyz) == HTTP_MOVED_TEMP \
 116                             || (xyz) == HTTP_TEMP_REDIRECT \
 117                             || (xyz) == HTTP_PERM_REDIRECT \
 118                             || (xyz) == HTTP_USE_PROXY \
 119                             || (xyz) == HTTP_SEE_OTHER)
 120
 121 #define HTTP_ERROR(xyz) ((xyz) >= 400 && (xyz) <= 599)
 122
 123
 124 /*****************************************************************************
 125  * I/O functions for decoding chunked streams
 126  */
 127
 128 struct httpio
 129 {
 130         conn_t          *conn;          /* connection */
 131         int              chunked;       /* chunked mode */
 132         char            *buf;           /* chunk buffer */
 133         size_t           bufsize;       /* size of chunk buffer */
 134         size_t           buflen;        /* amount of data currently in buffer */
 135         size_t           bufpos;        /* current read offset in buffer */
 136         int              eof;           /* end-of-file flag */
 137         int              error;         /* error flag */
 138         size_t           chunksize;     /* remaining size of current chunk */
 139 #ifndef NDEBUG
 140         size_t           total;
 141 #endif
 142 };
 143
 144 /*
 145  * Get next chunk header
 146  */
 147 static int
 148 http_new_chunk(struct httpio *io)
 149 {
 150         char *p;
 151
 152         if (fetch_getln(io->conn) == -1)
 153                 return (-1);
 154
 155         if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf))
 156                 return (-1);
 157
 158         for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) {
 159                 if (*p == ';')
 160                         break;
 161                 if (!isxdigit((unsigned char)*p))
 162                         return (-1);
 163                 if (isdigit((unsigned char)*p)) {
 164                         io->chunksize = io->chunksize * 16 +
 165                             *p - '0';
 166                 } else {
 167                         io->chunksize = io->chunksize * 16 +
 168                             10 + tolower((unsigned char)*p) - 'a';
 169                 }
 170         }
 171
 172 #ifndef NDEBUG
 173         if (fetchDebug) {
 174                 io->total += io->chunksize;
 175                 if (io->chunksize == 0)
 176                         fprintf(stderr, "%s(): end of last chunk\n", __func__);
 177                 else
 178                         fprintf(stderr, "%s(): new chunk: %lu (%lu)\n",
 179                             __func__, (unsigned long)io->chunksize,
 180                             (unsigned long)io->total);
 181         }
 182 #endif
 183
 184         return (io->chunksize);
 185 }
 186
 187 /*
 188  * Grow the input buffer to at least len bytes
 189  */
 190 static inline int
 191 http_growbuf(struct httpio *io, size_t len)
 192 {
 193         char *tmp;
 194
 195         if (io->bufsize >= len)
 196                 return (0);
 197
 198         if ((tmp = realloc(io->buf, len)) == NULL)
 199                 return (-1);
 200         io->buf = tmp;
 201         io->bufsize = len;
 202         return (0);
 203 }
 204
 205 /*
 206  * Fill the input buffer, do chunk decoding on the fly
 207  */
 208 static ssize_t
 209 http_fillbuf(struct httpio *io, size_t len)
 210 {
 211         ssize_t nbytes;
 212         char ch;
 213
 214         if (io->error)
 215                 return (-1);
 216         if (io->eof)
 217                 return (0);
 218
 219         /* not chunked: just fetch the requested amount */
 220         if (io->chunked == 0) {
 221                 if (http_growbuf(io, len) == -1)
 222                         return (-1);
 223                 if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) {
 224                         io->error = errno;
 225                         return (-1);
 226                 }
 227                 io->buflen = nbytes;
 228                 io->bufpos = 0;
 229                 return (io->buflen);
 230         }
 231
 232         /* chunked, but we ran out: get the next chunk header */
 233         if (io->chunksize == 0) {
 234                 switch (http_new_chunk(io)) {
 235                 case -1:
 236                         io->error = EPROTO;
 237                         return (-1);
 238                 case 0:
 239                         io->eof = 1;
 240                         return (0);
 241                 }
 242         }
 243
 244         /* fetch the requested amount, but no more than the current chunk */
 245         if (len > io->chunksize)
 246                 len = io->chunksize;
 247         if (http_growbuf(io, len) == -1)
 248                 return (-1);
 249         if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) {
 250                 io->error = errno;
 251                 return (-1);
 252         }
 253         io->bufpos = 0;
 254         io->buflen = nbytes;
 255         io->chunksize -= nbytes;
 256
 257         if (io->chunksize == 0) {
 258                 if (fetch_read(io->conn, &ch, 1) != 1 || ch != '\r' ||
 259                     fetch_read(io->conn, &ch, 1) != 1 || ch != '\n')
 260                         return (-1);
 261         }
 262
 263         return (io->buflen);
 264 }
 265
 266 /*
 267  * Read function
 268  */
 269 static int
 270 http_readfn(void *v, char *buf, int len)
 271 {
 272         struct httpio *io = (struct httpio *)v;
 273         int rlen;
 274
 275         if (io->error)
 276                 return (-1);
 277         if (io->eof)
 278                 return (0);
 279
 280         /* empty buffer */
 281         if (!io->buf || io->bufpos == io->buflen) {
 282                 if ((rlen = http_fillbuf(io, len)) < 0) {
 283                         if ((errno = io->error) == EINTR)
 284                                 io->error = 0;
 285                         return (-1);
 286                 } else if (rlen == 0) {
 287                         return (0);
 288                 }
 289         }
 290
 291         rlen = io->buflen - io->bufpos;
 292         if (len < rlen)
 293                 rlen = len;
 294         memcpy(buf, io->buf + io->bufpos, rlen);
 295         io->bufpos += rlen;
 296         return (rlen);
 297 }
 298
 299 /*
 300  * Write function
 301  */
 302 static int
 303 http_writefn(void *v, const char *buf, int len)
 304 {
 305         struct httpio *io = (struct httpio *)v;
 306
 307         return (fetch_write(io->conn, buf, len));
 308 }
 309
 310 /*
 311  * Close function
 312  */
 313 static int
 314 http_closefn(void *v)
 315 {
 316         struct httpio *io = (struct httpio *)v;
 317         int r;
 318
 319         r = fetch_close(io->conn);
 320         if (io->buf)
 321                 free(io->buf);
 322         free(io);
 323         return (r);
 324 }
 325
 326 /*
 327  * Wrap a file descriptor up
 328  */
 329 static FILE *
 330 http_funopen(conn_t *conn, int chunked)
 331 {
 332         struct httpio *io;
 333         FILE *f;
 334
 335         if ((io = calloc(1, sizeof(*io))) == NULL) {
 336                 fetch_syserr();
 337                 return (NULL);
 338         }
 339         io->conn = conn;
 340         io->chunked = chunked;
 341         f = funopen(io, http_readfn, http_writefn, NULL, http_closefn);
 342         if (f == NULL) {
 343                 fetch_syserr();
 344                 free(io);
 345                 return (NULL);
 346         }
 347         return (f);
 348 }
 349
 350
 351 /*****************************************************************************
 352  * Helper functions for talking to the server and parsing its replies
 353  */
 354
 355 /* Header types */
 356 typedef enum {
 357         hdr_syserror = -2,
 358         hdr_error = -1,
 359         hdr_end = 0,
 360         hdr_unknown = 1,
 361         hdr_content_length,
 362         hdr_content_range,
 363         hdr_last_modified,
 364         hdr_location,
 365         hdr_transfer_encoding,
 366         hdr_www_authenticate,
 367         hdr_proxy_authenticate,
 368 } hdr_t;
 369
 370 /* Names of interesting headers */
 371 static struct {
 372         hdr_t            num;
 373         const char      *name;
 374 } hdr_names[] = {
 375         { hdr_content_length,           "Content-Length" },
 376         { hdr_content_range,            "Content-Range" },
 377         { hdr_last_modified,            "Last-Modified" },
 378         { hdr_location,                 "Location" },
 379         { hdr_transfer_encoding,        "Transfer-Encoding" },
 380         { hdr_www_authenticate,         "WWW-Authenticate" },
 381         { hdr_proxy_authenticate,       "Proxy-Authenticate" },
 382         { hdr_unknown,                  NULL },
 383 };
 384
 385 /*
 386  * Send a formatted line; optionally echo to terminal
 387  */
 388 static int
 389 http_cmd(conn_t *conn, const char *fmt, ...)
 390 {
 391         va_list ap;
 392         size_t len;
 393         char *msg;
 394         int r;
 395
 396         va_start(ap, fmt);
 397         len = vasprintf(&msg, fmt, ap);
 398         va_end(ap);
 399
 400         if (msg == NULL) {
 401                 errno = ENOMEM;
 402                 fetch_syserr();
 403                 return (-1);
 404         }
 405
 406         r = fetch_putln(conn, msg, len);
 407         free(msg);
 408
 409         if (r == -1) {
 410                 fetch_syserr();
 411                 return (-1);
 412         }
 413
 414         return (0);
 415 }
 416
 417 /*
 418  * Get and parse status line
 419  */
 420 static int
 421 http_get_reply(conn_t *conn)
 422 {
 423         char *p;
 424
 425         if (fetch_getln(conn) == -1)
 426                 return (-1);
 427         /*
 428          * A valid status line looks like "HTTP/m.n xyz reason" where m
 429          * and n are the major and minor protocol version numbers and xyz
 430          * is the reply code.
 431          * Unfortunately, there are servers out there (NCSA 1.5.1, to name
 432          * just one) that do not send a version number, so we can't rely
 433          * on finding one, but if we do, insist on it being 1.0 or 1.1.
 434          * We don't care about the reason phrase.
 435          */
 436         if (strncmp(conn->buf, "HTTP", 4) != 0)
 437                 return (HTTP_PROTOCOL_ERROR);
 438         p = conn->buf + 4;
 439         if (*p == '/') {
 440                 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1'))
 441                         return (HTTP_PROTOCOL_ERROR);
 442                 p += 4;
 443         }
 444         if (*p != ' ' ||
 445             !isdigit((unsigned char)p[1]) ||
 446             !isdigit((unsigned char)p[2]) ||
 447             !isdigit((unsigned char)p[3]))
 448                 return (HTTP_PROTOCOL_ERROR);
 449
 450         conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0');
 451         return (conn->err);
 452 }
 453
 454 /*
 455  * Check a header; if the type matches the given string, return a pointer
 456  * to the beginning of the value.
 457  */
 458 static const char *
 459 http_match(const char *str, const char *hdr)
 460 {
 461         while (*str && *hdr &&
 462             tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++))
 463                 /* nothing */;
 464         if (*str || *hdr != ':')
 465                 return (NULL);
 466         while (*hdr && isspace((unsigned char)*++hdr))
 467                 /* nothing */;
 468         return (hdr);
 469 }
 470
 471
 472 /*
 473  * Get the next header and return the appropriate symbolic code.  We
 474  * need to read one line ahead for checking for a continuation line
 475  * belonging to the current header (continuation lines start with
 476  * white space).
 477  *
 478  * We get called with a fresh line already in the conn buffer, either
 479  * from the previous http_next_header() invocation, or, the first
 480  * time, from a fetch_getln() performed by our caller.
 481  *
 482  * This stops when we encounter an empty line (we dont read beyond the header
 483  * area).
 484  *
 485  * Note that the "headerbuf" is just a place to return the result. Its
 486  * contents are not used for the next call. This means that no cleanup
 487  * is needed when ie doing another connection, just call the cleanup when
 488  * fully done to deallocate memory.
 489  */
 490
 491 /* Limit the max number of continuation lines to some reasonable value */
 492 #define HTTP_MAX_CONT_LINES 10
 493
 494 /* Place into which to build a header from one or several lines */
 495 typedef struct {
 496         char    *buf;           /* buffer */
 497         size_t   bufsize;       /* buffer size */
 498         size_t   buflen;        /* length of buffer contents */
 499 } http_headerbuf_t;
 500
 501 static void
 502 init_http_headerbuf(http_headerbuf_t *buf)
 503 {
 504         buf->buf = NULL;
 505         buf->bufsize = 0;
 506         buf->buflen = 0;
 507 }
 508
 509 static void
 510 clean_http_headerbuf(http_headerbuf_t *buf)
 511 {
 512         if (buf->buf)
 513                 free(buf->buf);
 514         init_http_headerbuf(buf);
 515 }
 516
 517 /* Remove whitespace at the end of the buffer */
 518 static void
 519 http_conn_trimright(conn_t *conn)
 520 {
 521         while (conn->buflen &&
 522                isspace((unsigned char)conn->buf[conn->buflen - 1]))
 523                 conn->buflen--;
 524         conn->buf[conn->buflen] = '\0';
 525 }
 526
 527 static hdr_t
 528 http_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p)
 529 {
 530         unsigned int i, len;
 531
 532         /*
 533          * Have to do the stripping here because of the first line. So
 534          * it's done twice for the subsequent lines. No big deal
 535          */
 536         http_conn_trimright(conn);
 537         if (conn->buflen == 0)
 538                 return (hdr_end);
 539
 540         /* Copy the line to the headerbuf */
 541         if (hbuf->bufsize < conn->buflen + 1) {
 542                 if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL)
 543                         return (hdr_syserror);
 544                 hbuf->bufsize = conn->buflen + 1;
 545         }
 546         strcpy(hbuf->buf, conn->buf);
 547         hbuf->buflen = conn->buflen;
 548
 549         /*
 550          * Fetch possible continuation lines. Stop at 1st non-continuation
 551          * and leave it in the conn buffer
 552          */
 553         for (i = 0; i < HTTP_MAX_CONT_LINES; i++) {
 554                 if (fetch_getln(conn) == -1)
 555                         return (hdr_syserror);
 556
 557                 /*
 558                  * Note: we carry on the idea from the previous version
 559                  * that a pure whitespace line is equivalent to an empty
 560                  * one (so it's not continuation and will be handled when
 561                  * we are called next)
 562                  */
 563                 http_conn_trimright(conn);
 564                 if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0])
 565                         break;
 566
 567                 /* Got a continuation line. Concatenate to previous */
 568                 len = hbuf->buflen + conn->buflen;
 569                 if (hbuf->bufsize < len + 1) {
 570                         len *= 2;
 571                         if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL)
 572                                 return (hdr_syserror);
 573                         hbuf->bufsize = len + 1;
 574                 }
 575                 strcpy(hbuf->buf + hbuf->buflen, conn->buf);
 576                 hbuf->buflen += conn->buflen;
 577         }
 578
 579         /*
 580          * We could check for malformed headers but we don't really care.
 581          * A valid header starts with a token immediately followed by a
 582          * colon; a token is any sequence of non-control, non-whitespace
 583          * characters except "()<>@,;:\\\"{}".
 584          */
 585         for (i = 0; hdr_names[i].num != hdr_unknown; i++)
 586                 if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL)
 587                         return (hdr_names[i].num);
 588
 589         return (hdr_unknown);
 590 }
 591
 592 /**************************
 593  * [Proxy-]Authenticate header parsing
 594  */
 595
 596 /*
 597  * Read doublequote-delimited string into output buffer obuf (allocated
 598  * by caller, whose responsibility it is to ensure that it's big enough)
 599  * cp points to the first char after the initial '"'
 600  * Handles \ quoting
 601  * Returns pointer to the first char after the terminating double quote, or
 602  * NULL for error.
 603  */
 604 static const char *
 605 http_parse_headerstring(const char *cp, char *obuf)
 606 {
 607         for (;;) {
 608                 switch (*cp) {
 609                 case 0: /* Unterminated string */
 610                         *obuf = 0;
 611                         return (NULL);
 612                 case '"': /* Ending quote */
 613                         *obuf = 0;
 614                         return (++cp);
 615                 case '\\':
 616                         if (*++cp == 0) {
 617                                 *obuf = 0;
 618                                 return (NULL);
 619                         }
 620                         /* FALLTHROUGH */
 621                 default:
 622                         *obuf++ = *cp++;
 623                 }
 624         }
 625 }
 626
 627 /* Http auth challenge schemes */
 628 typedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t;
 629
 630 /* Data holder for a Basic or Digest challenge. */
 631 typedef struct {
 632         http_auth_schemes_t scheme;
 633         char    *realm;
 634         char    *qop;
 635         char    *nonce;
 636         char    *opaque;
 637         char    *algo;
 638         int      stale;
 639         int      nc; /* Nonce count */
 640 } http_auth_challenge_t;
 641
 642 static void
 643 init_http_auth_challenge(http_auth_challenge_t *b)
 644 {
 645         b->scheme = HTTPAS_UNKNOWN;
 646         b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL;
 647         b->stale = b->nc = 0;
 648 }
 649
 650 static void
 651 clean_http_auth_challenge(http_auth_challenge_t *b)
 652 {
 653         if (b->realm)
 654                 free(b->realm);
 655         if (b->qop)
 656                 free(b->qop);
 657         if (b->nonce)
 658                 free(b->nonce);
 659         if (b->opaque)
 660                 free(b->opaque);
 661         if (b->algo)
 662                 free(b->algo);
 663         init_http_auth_challenge(b);
 664 }
 665
 666 /* Data holder for an array of challenges offered in an http response. */
 667 #define MAX_CHALLENGES 10
 668 typedef struct {
 669         http_auth_challenge_t *challenges[MAX_CHALLENGES];
 670         int     count; /* Number of parsed challenges in the array */
 671         int     valid; /* We did parse an authenticate header */
 672 } http_auth_challenges_t;
 673
 674 static void
 675 init_http_auth_challenges(http_auth_challenges_t *cs)
 676 {
 677         int i;
 678         for (i = 0; i < MAX_CHALLENGES; i++)
 679                 cs->challenges[i] = NULL;
 680         cs->count = cs->valid = 0;
 681 }
 682
 683 static void
 684 clean_http_auth_challenges(http_auth_challenges_t *cs)
 685 {
 686         int i;
 687         /* We rely on non-zero pointers being allocated, not on the count */
 688         for (i = 0; i < MAX_CHALLENGES; i++) {
 689                 if (cs->challenges[i] != NULL) {
 690                         clean_http_auth_challenge(cs->challenges[i]);
 691                         free(cs->challenges[i]);
 692                 }
 693         }
 694         init_http_auth_challenges(cs);
 695 }
 696
 697 /*
 698  * Enumeration for lexical elements. Separators will be returned as their own
 699  * ascii value
 700  */
 701 typedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258,
 702               HTTPHL_ERROR = 259} http_header_lex_t;
 703
 704 /*
 705  * Determine what kind of token comes next and return possible value
 706  * in buf, which is supposed to have been allocated big enough by
 707  * caller. Advance input pointer and return element type.
 708  */
 709 static int
 710 http_header_lex(const char **cpp, char *buf)
 711 {
 712         size_t l;
 713         /* Eat initial whitespace */
 714         *cpp += strspn(*cpp, " \t");
 715         if (**cpp == 0)
 716                 return (HTTPHL_END);
 717
 718         /* Separator ? */
 719         if (**cpp == ',' || **cpp == '=')
 720                 return (*((*cpp)++));
 721
 722         /* String ? */
 723         if (**cpp == '"') {
 724                 *cpp = http_parse_headerstring(++*cpp, buf);
 725                 if (*cpp == NULL)
 726                         return (HTTPHL_ERROR);
 727                 return (HTTPHL_STRING);
 728         }
 729
 730         /* Read other token, until separator or whitespace */
 731         l = strcspn(*cpp, " \t,=");
 732         memcpy(buf, *cpp, l);
 733         buf[l] = 0;
 734         *cpp += l;
 735         return (HTTPHL_WORD);
 736 }
 737
 738 /*
 739  * Read challenges from http xxx-authenticate header and accumulate them
 740  * in the challenges list structure.
 741  *
 742  * Headers with multiple challenges are specified by rfc2617, but
 743  * servers (ie: squid) often send them in separate headers instead,
 744  * which in turn is forbidden by the http spec (multiple headers with
 745  * the same name are only allowed for pure comma-separated lists, see
 746  * rfc2616 sec 4.2).
 747  *
 748  * We support both approaches anyway
 749  */
 750 static int
 751 http_parse_authenticate(const char *cp, http_auth_challenges_t *cs)
 752 {
 753         int ret = -1;
 754         http_header_lex_t lex;
 755         char *key = malloc(strlen(cp) + 1);
 756         char *value = malloc(strlen(cp) + 1);
 757         char *buf = malloc(strlen(cp) + 1);
 758
 759         if (key == NULL || value == NULL || buf == NULL) {
 760                 fetch_syserr();
 761                 goto out;
 762         }
 763
 764         /* In any case we've seen the header and we set the valid bit */
 765         cs->valid = 1;
 766
 767         /* Need word first */
 768         lex = http_header_lex(&cp, key);
 769         if (lex != HTTPHL_WORD)
 770                 goto out;
 771
 772         /* Loop on challenges */
 773         for (; cs->count < MAX_CHALLENGES; cs->count++) {
 774                 cs->challenges[cs->count] =
 775                         malloc(sizeof(http_auth_challenge_t));
 776                 if (cs->challenges[cs->count] == NULL) {
 777                         fetch_syserr();
 778                         goto out;
 779                 }
 780                 init_http_auth_challenge(cs->challenges[cs->count]);
 781                 if (!strcasecmp(key, "basic")) {
 782                         cs->challenges[cs->count]->scheme = HTTPAS_BASIC;
 783                 } else if (!strcasecmp(key, "digest")) {
 784                         cs->challenges[cs->count]->scheme = HTTPAS_DIGEST;
 785                 } else {
 786                         cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN;
 787                         /*
 788                          * Continue parsing as basic or digest may
 789                          * follow, and the syntax is the same for
 790                          * all. We'll just ignore this one when
 791                          * looking at the list
 792                          */
 793                 }
 794
 795                 /* Loop on attributes */
 796                 for (;;) {
 797                         /* Key */
 798                         lex = http_header_lex(&cp, key);
 799                         if (lex != HTTPHL_WORD)
 800                                 goto out;
 801
 802                         /* Equal sign */
 803                         lex = http_header_lex(&cp, buf);
 804                         if (lex != '=')
 805                                 goto out;
 806
 807                         /* Value */
 808                         lex = http_header_lex(&cp, value);
 809                         if (lex != HTTPHL_WORD && lex != HTTPHL_STRING)
 810                                 goto out;
 811
 812                         if (!strcasecmp(key, "realm"))
 813                                 cs->challenges[cs->count]->realm =
 814                                         strdup(value);
 815                         else if (!strcasecmp(key, "qop"))
 816                                 cs->challenges[cs->count]->qop =
 817                                         strdup(value);
 818                         else if (!strcasecmp(key, "nonce"))
 819                                 cs->challenges[cs->count]->nonce =
 820                                         strdup(value);
 821                         else if (!strcasecmp(key, "opaque"))
 822                                 cs->challenges[cs->count]->opaque =
 823                                         strdup(value);
 824                         else if (!strcasecmp(key, "algorithm"))
 825                                 cs->challenges[cs->count]->algo =
 826                                         strdup(value);
 827                         else if (!strcasecmp(key, "stale"))
 828                                 cs->challenges[cs->count]->stale =
 829                                         strcasecmp(value, "no");
 830                         /* Else ignore unknown attributes */
 831
 832                         /* Comma or Next challenge or End */
 833                         lex = http_header_lex(&cp, key);
 834                         /*
 835                          * If we get a word here, this is the beginning of the
 836                          * next challenge. Break the attributes loop
 837                          */
 838                         if (lex == HTTPHL_WORD)
 839                                 break;
 840
 841                         if (lex == HTTPHL_END) {
 842                                 /* End while looking for ',' is normal exit */
 843                                 cs->count++;
 844                                 ret = 0;
 845                                 goto out;
 846                         }
 847                         /* Anything else is an error */
 848                         if (lex != ',')
 849                                 goto out;
 850
 851                 } /* End attributes loop */
 852         } /* End challenge loop */
 853
 854         /*
 855          * Challenges max count exceeded. This really can't happen
 856          * with normal data, something's fishy -> error
 857          */
 858
 859 out:
 860         if (key)
 861                 free(key);
 862         if (value)
 863                 free(value);
 864         if (buf)
 865                 free(buf);
 866         return (ret);
 867 }
 868
 869
 870 /*
 871  * Parse a last-modified header
 872  */
 873 static int
 874 http_parse_mtime(const char *p, time_t *mtime)
 875 {
 876         char locale[64], *r;
 877         struct tm tm;
 878
 879         strlcpy(locale, setlocale(LC_TIME, NULL), sizeof(locale));
 880         setlocale(LC_TIME, "C");
 881         r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
 882         /*
 883          * Some proxies use UTC in response, but it should still be
 884          * parsed. RFC2616 states GMT and UTC are exactly equal for HTTP.
 885          */
 886         if (r == NULL)
 887                 r = strptime(p, "%a, %d %b %Y %H:%M:%S UTC", &tm);
 888         /* XXX should add support for date-2 and date-3 */
 889         setlocale(LC_TIME, locale);
 890         if (r == NULL)
 891                 return (-1);
 892         DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d "
 893                   "%02d:%02d:%02d]\n",
 894                   tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
 895                   tm.tm_hour, tm.tm_min, tm.tm_sec));
 896         *mtime = timegm(&tm);
 897         return (0);
 898 }
 899
 900 /*
 901  * Parse a content-length header
 902  */
 903 static int
 904 http_parse_length(const char *p, off_t *length)
 905 {
 906         off_t len;
 907
 908         for (len = 0; *p && isdigit((unsigned char)*p); ++p)
 909                 len = len * 10 + (*p - '0');
 910         if (*p)
 911                 return (-1);
 912         DEBUG(fprintf(stderr, "content length: [%lld]\n",
 913             (long long)len));
 914         *length = len;
 915         return (0);
 916 }
 917
 918 /*
 919  * Parse a content-range header
 920  */
 921 static int
 922 http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size)
 923 {
 924         off_t first, last, len;
 925
 926         if (strncasecmp(p, "bytes ", 6) != 0)
 927                 return (-1);
 928         p += 6;
 929         if (*p == '*') {
 930                 first = last = -1;
 931                 ++p;
 932         } else {
 933                 for (first = 0; *p && isdigit((unsigned char)*p); ++p)
 934                         first = first * 10 + *p - '0';
 935                 if (*p != '-')
 936                         return (-1);
 937                 for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p)
 938                         last = last * 10 + *p - '0';
 939         }
 940         if (first > last || *p != '/')
 941                 return (-1);
 942         for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p)
 943                 len = len * 10 + *p - '0';
 944         if (*p || len < last - first + 1)
 945                 return (-1);
 946         if (first == -1) {
 947                 DEBUG(fprintf(stderr, "content range: [*/%lld]\n",
 948                     (long long)len));
 949                 *length = 0;
 950         } else {
 951                 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n",
 952                     (long long)first, (long long)last, (long long)len));
 953                 *length = last - first + 1;
 954         }
 955         *offset = first;
 956         *size = len;
 957         return (0);
 958 }
 959
 960
 961 /*****************************************************************************
 962  * Helper functions for authorization
 963  */
 964
 965 /*
 966  * Base64 encoding
 967  */
 968 static char *
 969 http_base64(const char *src)
 970 {
 971         static const char base64[] =
 972             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 973             "abcdefghijklmnopqrstuvwxyz"
 974             "0123456789+/";
 975         char *str, *dst;
 976         size_t l;
 977         int t, r;
 978
 979         l = strlen(src);
 980         if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL)
 981                 return (NULL);
 982         dst = str;
 983         r = 0;
 984
 985         while (l >= 3) {
 986                 t = (src[0] << 16) | (src[1] << 8) | src[2];
 987                 dst[0] = base64[(t >> 18) & 0x3f];
 988                 dst[1] = base64[(t >> 12) & 0x3f];
 989                 dst[2] = base64[(t >> 6) & 0x3f];
 990                 dst[3] = base64[(t >> 0) & 0x3f];
 991                 src += 3; l -= 3;
 992                 dst += 4; r += 4;
 993         }
 994
 995         switch (l) {
 996         case 2:
 997                 t = (src[0] << 16) | (src[1] << 8);
 998                 dst[0] = base64[(t >> 18) & 0x3f];
 999                 dst[1] = base64[(t >> 12) & 0x3f];
1000                 dst[2] = base64[(t >> 6) & 0x3f];
1001                 dst[3] = '=';
1002                 dst += 4;
1003                 r += 4;
1004                 break;
1005         case 1:
1006                 t = src[0] << 16;
1007                 dst[0] = base64[(t >> 18) & 0x3f];
1008                 dst[1] = base64[(t >> 12) & 0x3f];
1009                 dst[2] = dst[3] = '=';
1010                 dst += 4;
1011                 r += 4;
1012                 break;
1013         case 0:
1014                 break;
1015         }
1016
1017         *dst = 0;
1018         return (str);
1019 }
1020
1021
1022 /*
1023  * Extract authorization parameters from environment value.
1024  * The value is like scheme:realm:user:pass
1025  */
1026 typedef struct {
1027         char    *scheme;
1028         char    *realm;
1029         char    *user;
1030         char    *password;
1031 } http_auth_params_t;
1032
1033 static void
1034 init_http_auth_params(http_auth_params_t *s)
1035 {
1036         s->scheme = s->realm = s->user = s->password = NULL;
1037 }
1038
1039 static void
1040 clean_http_auth_params(http_auth_params_t *s)
1041 {
1042         if (s->scheme)
1043                 free(s->scheme);
1044         if (s->realm)
1045                 free(s->realm);
1046         if (s->user)
1047                 free(s->user);
1048         if (s->password)
1049                 free(s->password);
1050         init_http_auth_params(s);
1051 }
1052
1053 static int
1054 http_authfromenv(const char *p, http_auth_params_t *parms)
1055 {
1056         int ret = -1;
1057         char *v, *ve;
1058         char *str = strdup(p);
1059
1060         if (str == NULL) {
1061                 fetch_syserr();
1062                 return (-1);
1063         }
1064         v = str;
1065
1066         if ((ve = strchr(v, ':')) == NULL)
1067                 goto out;
1068
1069         *ve = 0;
1070         if ((parms->scheme = strdup(v)) == NULL) {
1071                 fetch_syserr();
1072                 goto out;
1073         }
1074         v = ve + 1;
1075
1076         if ((ve = strchr(v, ':')) == NULL)
1077                 goto out;
1078
1079         *ve = 0;
1080         if ((parms->realm = strdup(v)) == NULL) {
1081                 fetch_syserr();
1082                 goto out;
1083         }
1084         v = ve + 1;
1085
1086         if ((ve = strchr(v, ':')) == NULL)
1087                 goto out;
1088
1089         *ve = 0;
1090         if ((parms->user = strdup(v)) == NULL) {
1091                 fetch_syserr();
1092                 goto out;
1093         }
1094         v = ve + 1;
1095
1096
1097         if ((parms->password = strdup(v)) == NULL) {
1098                 fetch_syserr();
1099                 goto out;
1100         }
1101         ret = 0;
1102 out:
1103         if (ret == -1)
1104                 clean_http_auth_params(parms);
1105         if (str)
1106                 free(str);
1107         return (ret);
1108 }
1109
1110
1111 /*
1112  * Digest response: the code to compute the digest is taken from the
1113  * sample implementation in RFC2616
1114  */
1115 #define IN const
1116 #define OUT
1117
1118 #define HASHLEN 16
1119 typedef char HASH[HASHLEN];
1120 #define HASHHEXLEN 32
1121 typedef char HASHHEX[HASHHEXLEN+1];
1122
1123 static const char *hexchars = "0123456789abcdef";
1124 static void
1125 CvtHex(IN HASH Bin, OUT HASHHEX Hex)
1126 {
1127         unsigned short i;
1128         unsigned char j;
1129
1130         for (i = 0; i < HASHLEN; i++) {
1131                 j = (Bin[i] >> 4) & 0xf;
1132                 Hex[i*2] = hexchars[j];
1133                 j = Bin[i] & 0xf;
1134                 Hex[i*2+1] = hexchars[j];
1135         }
1136         Hex[HASHHEXLEN] = '\0';
1137 };
1138
1139 /* calculate H(A1) as per spec */
1140 static void
1141 DigestCalcHA1(
1142         IN char * pszAlg,
1143         IN char * pszUserName,
1144         IN char * pszRealm,
1145         IN char * pszPassword,
1146         IN char * pszNonce,
1147         IN char * pszCNonce,
1148         OUT HASHHEX SessionKey
1149         )
1150 {
1151         MD5_CTX Md5Ctx;
1152         HASH HA1;
1153
1154         MD5Init(&Md5Ctx);
1155         MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName));
1156         MD5Update(&Md5Ctx, ":", 1);
1157         MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm));
1158         MD5Update(&Md5Ctx, ":", 1);
1159         MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword));
1160         MD5Final(HA1, &Md5Ctx);
1161         if (strcasecmp(pszAlg, "md5-sess") == 0) {
1162
1163                 MD5Init(&Md5Ctx);
1164                 MD5Update(&Md5Ctx, HA1, HASHLEN);
1165                 MD5Update(&Md5Ctx, ":", 1);
1166                 MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce));
1167                 MD5Update(&Md5Ctx, ":", 1);
1168                 MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce));
1169                 MD5Final(HA1, &Md5Ctx);
1170         }
1171         CvtHex(HA1, SessionKey);
1172 }
1173
1174 /* calculate request-digest/response-digest as per HTTP Digest spec */
1175 static void
1176 DigestCalcResponse(
1177         IN HASHHEX HA1,           /* H(A1) */
1178         IN char * pszNonce,       /* nonce from server */
1179         IN char * pszNonceCount,  /* 8 hex digits */
1180         IN char * pszCNonce,      /* client nonce */
1181         IN char * pszQop,         /* qop-value: "", "auth", "auth-int" */
1182         IN char * pszMethod,      /* method from the request */
1183         IN char * pszDigestUri,   /* requested URL */
1184         IN HASHHEX HEntity,       /* H(entity body) if qop="auth-int" */
1185         OUT HASHHEX Response      /* request-digest or response-digest */
1186         )
1187 {
1188 /*      DEBUG(fprintf(stderr,
1189                       "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n",
1190                       HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/
1191         MD5_CTX Md5Ctx;
1192         HASH HA2;
1193         HASH RespHash;
1194         HASHHEX HA2Hex;
1195
1196         // calculate H(A2)
1197         MD5Init(&Md5Ctx);
1198         MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod));
1199         MD5Update(&Md5Ctx, ":", 1);
1200         MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri));
1201         if (strcasecmp(pszQop, "auth-int") == 0) {
1202                 MD5Update(&Md5Ctx, ":", 1);
1203                 MD5Update(&Md5Ctx, HEntity, HASHHEXLEN);
1204         }
1205         MD5Final(HA2, &Md5Ctx);
1206         CvtHex(HA2, HA2Hex);
1207
1208         // calculate response
1209         MD5Init(&Md5Ctx);
1210         MD5Update(&Md5Ctx, HA1, HASHHEXLEN);
1211         MD5Update(&Md5Ctx, ":", 1);
1212         MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce));
1213         MD5Update(&Md5Ctx, ":", 1);
1214         if (*pszQop) {
1215                 MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount));
1216                 MD5Update(&Md5Ctx, ":", 1);
1217                 MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce));
1218                 MD5Update(&Md5Ctx, ":", 1);
1219                 MD5Update(&Md5Ctx, pszQop, strlen(pszQop));
1220                 MD5Update(&Md5Ctx, ":", 1);
1221         }
1222         MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN);
1223         MD5Final(RespHash, &Md5Ctx);
1224         CvtHex(RespHash, Response);
1225 }
1226
1227 /*
1228  * Generate/Send a Digest authorization header
1229  * This looks like: [Proxy-]Authorization: credentials
1230  *
1231  *  credentials      = "Digest" digest-response
1232  *  digest-response  = 1#( username | realm | nonce | digest-uri
1233  *                      | response | [ algorithm ] | [cnonce] |
1234  *                      [opaque] | [message-qop] |
1235  *                          [nonce-count]  | [auth-param] )
1236  *  username         = "username" "=" username-value
1237  *  username-value   = quoted-string
1238  *  digest-uri       = "uri" "=" digest-uri-value
1239  *  digest-uri-value = request-uri   ; As specified by HTTP/1.1
1240  *  message-qop      = "qop" "=" qop-value
1241  *  cnonce           = "cnonce" "=" cnonce-value
1242  *  cnonce-value     = nonce-value
1243  *  nonce-count      = "nc" "=" nc-value
1244  *  nc-value         = 8LHEX
1245  *  response         = "response" "=" request-digest
1246  *  request-digest = <"> 32LHEX <">
1247  */
1248 static int
1249 http_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c,
1250                  http_auth_params_t *parms, struct url *url)
1251 {
1252         int r;
1253         char noncecount[10];
1254         char cnonce[40];
1255         char *options = NULL;
1256
1257         if (!c->realm || !c->nonce) {
1258                 DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n"));
1259                 return(-1);
1260         }
1261         if (!c->algo)
1262                 c->algo = strdup("");
1263
1264         if (asprintf(&options, "%s%s%s%s",
1265                      *c->algo? ",algorithm=" : "", c->algo,
1266                      c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1)
1267                 return (-1);
1268
1269         if (!c->qop) {
1270                 c->qop = strdup("");
1271                 *noncecount = 0;
1272                 *cnonce = 0;
1273         } else {
1274                 c->nc++;
1275                 sprintf(noncecount, "%08x", c->nc);
1276                 /* We don't try very hard with the cnonce ... */
1277                 sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0));
1278         }
1279
1280         HASHHEX HA1;
1281         DigestCalcHA1(c->algo, parms->user, c->realm,
1282                       parms->password, c->nonce, cnonce, HA1);
1283         DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1));
1284         HASHHEX digest;
1285         DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop,
1286                            "GET", url->doc, "", digest);
1287
1288         if (c->qop[0]) {
1289                 r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\","
1290                              "nonce=\"%s\",uri=\"%s\",response=\"%s\","
1291                              "qop=\"auth\", cnonce=\"%s\", nc=%s%s",
1292                              hdr, parms->user, c->realm,
1293                              c->nonce, url->doc, digest,
1294                              cnonce, noncecount, options);
1295         } else {
1296                 r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\","
1297                              "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s",
1298                              hdr, parms->user, c->realm,
1299                              c->nonce, url->doc, digest, options);
1300         }
1301         if (options)
1302                 free(options);
1303         return (r);
1304 }
1305
1306 /*
1307  * Encode username and password
1308  */
1309 static int
1310 http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd)
1311 {
1312         char *upw, *auth;
1313         int r;
1314
1315         DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr));
1316         DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd));
1317         if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
1318                 return (-1);
1319         auth = http_base64(upw);
1320         free(upw);
1321         if (auth == NULL)
1322                 return (-1);
1323         r = http_cmd(conn, "%s: Basic %s", hdr, auth);
1324         free(auth);
1325         return (r);
1326 }
1327
1328 /*
1329  * Chose the challenge to answer and call the appropriate routine to
1330  * produce the header.
1331  */
1332 static int
1333 http_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs,
1334                http_auth_params_t *parms, struct url *url)
1335 {
1336         http_auth_challenge_t *digest = NULL;
1337         int i;
1338
1339         /* If user or pass are null we're not happy */
1340         if (!parms->user || !parms->password) {
1341                 DEBUG(fprintf(stderr, "NULL usr or pass\n"));
1342                 return (-1);
1343         }
1344
1345         /* Look for a Digest */
1346         for (i = 0; i < cs->count; i++) {
1347                 if (cs->challenges[i]->scheme == HTTPAS_DIGEST)
1348                         digest = cs->challenges[i];
1349         }
1350
1351         /* Error if "Digest" was specified and there is no Digest challenge */
1352         if (!digest && (parms->scheme &&
1353                         !strcasecmp(parms->scheme, "digest"))) {
1354                 DEBUG(fprintf(stderr,
1355                               "Digest auth in env, not supported by peer\n"));
1356                 return (-1);
1357         }
1358         /*
1359          * If "basic" was specified in the environment, or there is no Digest
1360          * challenge, do the basic thing. Don't need a challenge for this,
1361          * so no need to check basic!=NULL
1362          */
1363         if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic")))
1364                 return (http_basic_auth(conn,hdr,parms->user,parms->password));
1365
1366         /* Else, prefer digest. We just checked that it's not NULL */
1367         return (http_digest_auth(conn, hdr, digest, parms, url));
1368 }
1369
1370 /*****************************************************************************
1371  * Helper functions for connecting to a server or proxy
1372  */
1373
1374 /*
1375  * Connect to the correct HTTP server or proxy.
1376  */
1377 static conn_t *
1378 http_connect(struct url *URL, struct url *purl, const char *flags)
1379 {
1380         struct url *curl;
1381         conn_t *conn;
1382         hdr_t h;
1383         http_headerbuf_t headerbuf;
1384         const char *p;
1385         int verbose;
1386         int af, val;
1387         int serrno;
1388
1389 #ifdef INET6
1390         af = AF_UNSPEC;
1391 #else
1392         af = AF_INET;
1393 #endif
1394
1395         verbose = CHECK_FLAG('v');
1396         if (CHECK_FLAG('4'))
1397                 af = AF_INET;
1398 #ifdef INET6
1399         else if (CHECK_FLAG('6'))
1400                 af = AF_INET6;
1401 #endif
1402
1403         curl = (purl != NULL) ? purl : URL;
1404
1405         if ((conn = fetch_connect(curl->host, curl->port, af, verbose)) == NULL)
1406                 /* fetch_connect() has already set an error code */
1407                 return (NULL);
1408         init_http_headerbuf(&headerbuf);
1409         if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && purl) {
1410                 http_cmd(conn, "CONNECT %s:%d HTTP/1.1",
1411                     URL->host, URL->port);
1412                 http_cmd(conn, "Host: %s:%d",
1413                     URL->host, URL->port);
1414                 http_cmd(conn, "");
1415                 if (http_get_reply(conn) != HTTP_OK) {
1416                         http_seterr(conn->err);
1417                         goto ouch;
1418                 }
1419                 /* Read and discard the rest of the proxy response */
1420                 if (fetch_getln(conn) < 0) {
1421                         fetch_syserr();
1422                         goto ouch;
1423                 }
1424                 do {
1425                         switch ((h = http_next_header(conn, &headerbuf, &p))) {
1426                         case hdr_syserror:
1427                                 fetch_syserr();
1428                                 goto ouch;
1429                         case hdr_error:
1430                                 http_seterr(HTTP_PROTOCOL_ERROR);
1431                                 goto ouch;
1432                         default:
1433                                 /* ignore */ ;
1434                         }
1435                 } while (h > hdr_end);
1436         }
1437         if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 &&
1438             fetch_ssl(conn, URL, verbose) == -1) {
1439                 /* grrr */
1440                 errno = EAUTH;
1441                 fetch_syserr();
1442                 goto ouch;
1443         }
1444
1445         val = 1;
1446         setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val));
1447
1448         clean_http_headerbuf(&headerbuf);
1449         return (conn);
1450 ouch:
1451         serrno = errno;
1452         clean_http_headerbuf(&headerbuf);
1453         fetch_close(conn);
1454         errno = serrno;
1455         return (NULL);
1456 }
1457
1458 static struct url *
1459 http_get_proxy(struct url * url, const char *flags)
1460 {
1461         struct url *purl;
1462         char *p;
1463
1464         if (flags != NULL && strchr(flags, 'd') != NULL)
1465                 return (NULL);
1466         if (fetch_no_proxy_match(url->host))
1467                 return (NULL);
1468         if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
1469             *p && (purl = fetchParseURL(p))) {
1470                 if (!*purl->scheme)
1471                         strcpy(purl->scheme, SCHEME_HTTP);
1472                 if (!purl->port)
1473                         purl->port = fetch_default_proxy_port(purl->scheme);
1474                 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
1475                         return (purl);
1476                 fetchFreeURL(purl);
1477         }
1478         return (NULL);
1479 }
1480
1481 static void
1482 http_print_html(FILE *out, FILE *in)
1483 {
1484         size_t len;
1485         char *line, *p, *q;
1486         int comment, tag;
1487
1488         comment = tag = 0;
1489         while ((line = fgetln(in, &len)) != NULL) {
1490                 while (len && isspace((unsigned char)line[len - 1]))
1491                         --len;
1492                 for (p = q = line; q < line + len; ++q) {
1493                         if (comment && *q == '-') {
1494                                 if (q + 2 < line + len &&
1495                                     strcmp(q, "-->") == 0) {
1496                                         tag = comment = 0;
1497                                         q += 2;
1498                                 }
1499                         } else if (tag && !comment && *q == '>') {
1500                                 p = q + 1;
1501                                 tag = 0;
1502                         } else if (!tag && *q == '<') {
1503                                 if (q > p)
1504                                         fwrite(p, q - p, 1, out);
1505                                 tag = 1;
1506                                 if (q + 3 < line + len &&
1507                                     strcmp(q, "<!--") == 0) {
1508                                         comment = 1;
1509                                         q += 3;
1510                                 }
1511                         }
1512                 }
1513                 if (!tag && q > p)
1514                         fwrite(p, q - p, 1, out);
1515                 fputc('\n', out);
1516         }
1517 }
1518
1519
1520 /*****************************************************************************
1521  * Core
1522  */
1523
1524 FILE *
1525 http_request(struct url *URL, const char *op, struct url_stat *us,
1526         struct url *purl, const char *flags)
1527 {
1528
1529         return (http_request_body(URL, op, us, purl, flags, NULL, NULL));
1530 }
1531
1532 /*
1533  * Send a request and process the reply
1534  *
1535  * XXX This function is way too long, the do..while loop should be split
1536  * XXX off into a separate function.
1537  */
1538 FILE *
1539 http_request_body(struct url *URL, const char *op, struct url_stat *us,
1540         struct url *purl, const char *flags, const char *content_type,
1541         const char *body)
1542 {
1543         char timebuf[80];
1544         char hbuf[MAXHOSTNAMELEN + 7], *host;
1545         conn_t *conn;
1546         struct url *url, *new;
1547         int chunked, direct, ims, noredirect, verbose;
1548         int e, i, n, val;
1549         off_t offset, clength, length, size;
1550         time_t mtime;
1551         const char *p;
1552         FILE *f;
1553         hdr_t h;
1554         struct tm *timestruct;
1555         http_headerbuf_t headerbuf;
1556         http_auth_challenges_t server_challenges;
1557         http_auth_challenges_t proxy_challenges;
1558         size_t body_len;
1559
1560         /* The following calls don't allocate anything */
1561         init_http_headerbuf(&headerbuf);
1562         init_http_auth_challenges(&server_challenges);
1563         init_http_auth_challenges(&proxy_challenges);
1564
1565         direct = CHECK_FLAG('d');
1566         noredirect = CHECK_FLAG('A');
1567         verbose = CHECK_FLAG('v');
1568         ims = CHECK_FLAG('i');
1569
1570         if (direct && purl) {
1571                 fetchFreeURL(purl);
1572                 purl = NULL;
1573         }
1574
1575         /* try the provided URL first */
1576         url = URL;
1577
1578         n = MAX_REDIRECT;
1579         i = 0;
1580
1581         e = HTTP_PROTOCOL_ERROR;
1582         do {
1583                 new = NULL;
1584                 chunked = 0;
1585                 offset = 0;
1586                 clength = -1;
1587                 length = -1;
1588                 size = -1;
1589                 mtime = 0;
1590
1591                 /* check port */
1592                 if (!url->port)
1593                         url->port = fetch_default_port(url->scheme);
1594
1595                 /* were we redirected to an FTP URL? */
1596                 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) {
1597                         if (strcmp(op, "GET") == 0)
1598                                 return (ftp_request(url, "RETR", us, purl, flags));
1599                         else if (strcmp(op, "HEAD") == 0)
1600                                 return (ftp_request(url, "STAT", us, purl, flags));
1601                 }
1602
1603                 /* connect to server or proxy */
1604                 if ((conn = http_connect(url, purl, flags)) == NULL)
1605                         goto ouch;
1606
1607                 /* append port number only if necessary */
1608                 host = url->host;
1609                 if (url->port != fetch_default_port(url->scheme)) {
1610                         snprintf(hbuf, sizeof(hbuf), "%s:%d", host, url->port);
1611                         host = hbuf;
1612                 }
1613
1614                 /* send request */
1615                 if (verbose)
1616                         fetch_info("requesting %s://%s%s",
1617                             url->scheme, host, url->doc);
1618                 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) {
1619                         http_cmd(conn, "%s %s://%s%s HTTP/1.1",
1620                             op, url->scheme, host, url->doc);
1621                 } else {
1622                         http_cmd(conn, "%s %s HTTP/1.1",
1623                             op, url->doc);
1624                 }
1625
1626                 if (ims && url->ims_time) {
1627                         timestruct = gmtime((time_t *)&url->ims_time);
1628                         (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT",
1629                             timestruct);
1630                         if (verbose)
1631                                 fetch_info("If-Modified-Since: %s", timebuf);
1632                         http_cmd(conn, "If-Modified-Since: %s", timebuf);
1633                 }
1634                 /* virtual host */
1635                 http_cmd(conn, "Host: %s", host);
1636
1637                 /*
1638                  * Proxy authorization: we only send auth after we received
1639                  * a 407 error. We do not first try basic anyway (changed
1640                  * when support was added for digest-auth)
1641                  */
1642                 if (purl && proxy_challenges.valid) {
1643                         http_auth_params_t aparams;
1644                         init_http_auth_params(&aparams);
1645                         if (*purl->user || *purl->pwd) {
1646                                 aparams.user = strdup(purl->user);
1647                                 aparams.password = strdup(purl->pwd);
1648                         } else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL &&
1649                                    *p != '\0') {
1650                                 if (http_authfromenv(p, &aparams) < 0) {
1651                                         http_seterr(HTTP_NEED_PROXY_AUTH);
1652                                         goto ouch;
1653                                 }
1654                         } else if (fetch_netrc_auth(purl) == 0) {
1655                                 aparams.user = strdup(purl->user);
1656                                 aparams.password = strdup(purl->pwd);
1657                         }
1658                         http_authorize(conn, "Proxy-Authorization",
1659                                        &proxy_challenges, &aparams, url);
1660                         clean_http_auth_params(&aparams);
1661                 }
1662
1663                 /*
1664                  * Server authorization: we never send "a priori"
1665                  * Basic auth, which used to be done if user/pass were
1666                  * set in the url. This would be weird because we'd send the
1667                  * password in the clear even if Digest is finally to be
1668                  * used (it would have made more sense for the
1669                  * pre-digest version to do this when Basic was specified
1670                  * in the environment)
1671                  */
1672                 if (server_challenges.valid) {
1673                         http_auth_params_t aparams;
1674                         init_http_auth_params(&aparams);
1675                         if (*url->user || *url->pwd) {
1676                                 aparams.user = strdup(url->user);
1677                                 aparams.password = strdup(url->pwd);
1678                         } else if ((p = getenv("HTTP_AUTH")) != NULL &&
1679                                    *p != '\0') {
1680                                 if (http_authfromenv(p, &aparams) < 0) {
1681                                         http_seterr(HTTP_NEED_AUTH);
1682                                         goto ouch;
1683                                 }
1684                         } else if (fetch_netrc_auth(url) == 0) {
1685                                 aparams.user = strdup(url->user);
1686                                 aparams.password = strdup(url->pwd);
1687                         } else if (fetchAuthMethod &&
1688                                    fetchAuthMethod(url) == 0) {
1689                                 aparams.user = strdup(url->user);
1690                                 aparams.password = strdup(url->pwd);
1691                         } else {
1692                                 http_seterr(HTTP_NEED_AUTH);
1693                                 goto ouch;
1694                         }
1695                         http_authorize(conn, "Authorization",
1696                                        &server_challenges, &aparams, url);
1697                         clean_http_auth_params(&aparams);
1698                 }
1699
1700                 /* other headers */
1701                 if ((p = getenv("HTTP_ACCEPT")) != NULL) {
1702                         if (*p != '\0')
1703                                 http_cmd(conn, "Accept: %s", p);
1704                 } else {
1705                         http_cmd(conn, "Accept: */*");
1706                 }
1707                 if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') {
1708                         if (strcasecmp(p, "auto") == 0)
1709                                 http_cmd(conn, "Referer: %s://%s%s",
1710                                     url->scheme, host, url->doc);
1711                         else
1712                                 http_cmd(conn, "Referer: %s", p);
1713                 }
1714                 if ((p = getenv("HTTP_USER_AGENT")) != NULL) {
1715                         /* no User-Agent if defined but empty */
1716                         if  (*p != '\0')
1717                                 http_cmd(conn, "User-Agent: %s", p);
1718                 } else {
1719                         /* default User-Agent */
1720                         http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER,
1721                             getprogname());
1722                 }
1723                 if (url->offset > 0)
1724                         http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset);
1725                 http_cmd(conn, "Connection: close");
1726
1727                 if (body) {
1728                         body_len = strlen(body);
1729                         http_cmd(conn, "Content-Length: %zu", body_len);
1730                         if (content_type != NULL)
1731                                 http_cmd(conn, "Content-Type: %s", content_type);
1732                 }
1733
1734                 http_cmd(conn, "");
1735
1736                 if (body)
1737                         fetch_write(conn, body, body_len);
1738
1739                 /*
1740                  * Force the queued request to be dispatched.  Normally, one
1741                  * would do this with shutdown(2) but squid proxies can be
1742                  * configured to disallow such half-closed connections.  To
1743                  * be compatible with such configurations, fiddle with socket
1744                  * options to force the pending data to be written.
1745                  */
1746                 val = 0;
1747                 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val,
1748                            sizeof(val));
1749                 val = 1;
1750                 setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val,
1751                            sizeof(val));
1752
1753                 /* get reply */
1754                 switch (http_get_reply(conn)) {
1755                 case HTTP_OK:
1756                 case HTTP_PARTIAL:
1757                 case HTTP_NOT_MODIFIED:
1758                         /* fine */
1759                         break;
1760                 case HTTP_MOVED_PERM:
1761                 case HTTP_MOVED_TEMP:
1762                 case HTTP_TEMP_REDIRECT:
1763                 case HTTP_PERM_REDIRECT:
1764                 case HTTP_SEE_OTHER:
1765                 case HTTP_USE_PROXY:
1766                         /*
1767                          * Not so fine, but we still have to read the
1768                          * headers to get the new location.
1769                          */
1770                         break;
1771                 case HTTP_NEED_AUTH:
1772                         if (server_challenges.valid) {
1773                                 /*
1774                                  * We already sent out authorization code,
1775                                  * so there's nothing more we can do.
1776                                  */
1777                                 http_seterr(conn->err);
1778                                 goto ouch;
1779                         }
1780                         /* try again, but send the password this time */
1781                         if (verbose)
1782                                 fetch_info("server requires authorization");
1783                         break;
1784                 case HTTP_NEED_PROXY_AUTH:
1785                         if (proxy_challenges.valid) {
1786                                 /*
1787                                  * We already sent our proxy
1788                                  * authorization code, so there's
1789                                  * nothing more we can do. */
1790                                 http_seterr(conn->err);
1791                                 goto ouch;
1792                         }
1793                         /* try again, but send the password this time */
1794                         if (verbose)
1795                                 fetch_info("proxy requires authorization");
1796                         break;
1797                 case HTTP_BAD_RANGE:
1798                         /*
1799                          * This can happen if we ask for 0 bytes because
1800                          * we already have the whole file.  Consider this
1801                          * a success for now, and check sizes later.
1802                          */
1803                         break;
1804                 case HTTP_PROTOCOL_ERROR:
1805                         /* fall through */
1806                 case -1:
1807                         fetch_syserr();
1808                         goto ouch;
1809                 default:
1810                         http_seterr(conn->err);
1811                         if (!verbose)
1812                                 goto ouch;
1813                         /* fall through so we can get the full error message */
1814                 }
1815
1816                 /* get headers. http_next_header expects one line readahead */
1817                 if (fetch_getln(conn) == -1) {
1818                         fetch_syserr();
1819                         goto ouch;
1820                 }
1821                 do {
1822                         switch ((h = http_next_header(conn, &headerbuf, &p))) {
1823                         case hdr_syserror:
1824                                 fetch_syserr();
1825                                 goto ouch;
1826                         case hdr_error:
1827                                 http_seterr(HTTP_PROTOCOL_ERROR);
1828                                 goto ouch;
1829                         case hdr_content_length:
1830                                 http_parse_length(p, &clength);
1831                                 break;
1832                         case hdr_content_range:
1833                                 http_parse_range(p, &offset, &length, &size);
1834                                 break;
1835                         case hdr_last_modified:
1836                                 http_parse_mtime(p, &mtime);
1837                                 break;
1838                         case hdr_location:
1839                                 if (!HTTP_REDIRECT(conn->err))
1840                                         break;
1841                                 /*
1842                                  * if the A flag is set, we don't follow
1843                                  * temporary redirects.
1844                                  */
1845                                 if (noredirect &&
1846                                     conn->err != HTTP_MOVED_PERM &&
1847                                     conn->err != HTTP_PERM_REDIRECT &&
1848                                     conn->err != HTTP_USE_PROXY) {
1849                                         n = 1;
1850                                         break;
1851                                 }
1852                                 if (new)
1853                                         free(new);
1854                                 if (verbose)
1855                                         fetch_info("%d redirect to %s", conn->err, p);
1856                                 if (*p == '/')
1857                                         /* absolute path */
1858                                         new = fetchMakeURL(url->scheme, url->host, url->port, p,
1859                                             url->user, url->pwd);
1860                                 else
1861                                         new = fetchParseURL(p);
1862                                 if (new == NULL) {
1863                                         /* XXX should set an error code */
1864                                         DEBUG(fprintf(stderr, "failed to parse new URL\n"));
1865                                         goto ouch;
1866                                 }
1867
1868                                 /* Only copy credentials if the host matches */
1869                                 if (!strcmp(new->host, url->host) && !*new->user && !*new->pwd) {
1870                                         strcpy(new->user, url->user);
1871                                         strcpy(new->pwd, url->pwd);
1872                                 }
1873                                 new->offset = url->offset;
1874                                 new->length = url->length;
1875                                 break;
1876                         case hdr_transfer_encoding:
1877                                 /* XXX weak test*/
1878                                 chunked = (strcasecmp(p, "chunked") == 0);
1879                                 break;
1880                         case hdr_www_authenticate:
1881                                 if (conn->err != HTTP_NEED_AUTH)
1882                                         break;
1883                                 if (http_parse_authenticate(p, &server_challenges) == 0)
1884                                         ++n;
1885                                 break;
1886                         case hdr_proxy_authenticate:
1887                                 if (conn->err != HTTP_NEED_PROXY_AUTH)
1888                                         break;
1889                                 if (http_parse_authenticate(p, &proxy_challenges) == 0)
1890                                         ++n;
1891                                 break;
1892                         case hdr_end:
1893                                 /* fall through */
1894                         case hdr_unknown:
1895                                 /* ignore */
1896                                 break;
1897                         }
1898                 } while (h > hdr_end);
1899
1900                 /* we need to provide authentication */
1901                 if (conn->err == HTTP_NEED_AUTH ||
1902                     conn->err == HTTP_NEED_PROXY_AUTH) {
1903                         e = conn->err;
1904                         if ((conn->err == HTTP_NEED_AUTH &&
1905                              !server_challenges.valid) ||
1906                             (conn->err == HTTP_NEED_PROXY_AUTH &&
1907                              !proxy_challenges.valid)) {
1908                                 /* 401/7 but no www/proxy-authenticate ?? */
1909                                 DEBUG(fprintf(stderr, "401/7 and no auth header\n"));
1910                                 goto ouch;
1911                         }
1912                         fetch_close(conn);
1913                         conn = NULL;
1914                         continue;
1915                 }
1916
1917                 /* requested range not satisfiable */
1918                 if (conn->err == HTTP_BAD_RANGE) {
1919                         if (url->offset > 0 && url->length == 0) {
1920                                 /* asked for 0 bytes; fake it */
1921                                 offset = url->offset;
1922                                 clength = -1;
1923                                 conn->err = HTTP_OK;
1924                                 break;
1925                         } else {
1926                                 http_seterr(conn->err);
1927                                 goto ouch;
1928                         }
1929                 }
1930
1931                 /* we have a hit or an error */
1932                 if (conn->err == HTTP_OK
1933                     || conn->err == HTTP_NOT_MODIFIED
1934                     || conn->err == HTTP_PARTIAL
1935                     || HTTP_ERROR(conn->err))
1936                         break;
1937
1938                 /* all other cases: we got a redirect */
1939                 e = conn->err;
1940                 clean_http_auth_challenges(&server_challenges);
1941                 fetch_close(conn);
1942                 conn = NULL;
1943                 if (!new) {
1944                         DEBUG(fprintf(stderr, "redirect with no new location\n"));
1945                         break;
1946                 }
1947                 if (url != URL)
1948                         fetchFreeURL(url);
1949                 url = new;
1950         } while (++i < n);
1951
1952         /* we failed, or ran out of retries */
1953         if (conn == NULL) {
1954                 http_seterr(e);
1955                 goto ouch;
1956         }
1957
1958         DEBUG(fprintf(stderr, "offset %lld, length %lld,"
1959                   " size %lld, clength %lld\n",
1960                   (long long)offset, (long long)length,
1961                   (long long)size, (long long)clength));
1962
1963         if (conn->err == HTTP_NOT_MODIFIED) {
1964                 http_seterr(HTTP_NOT_MODIFIED);
1965                 return (NULL);
1966         }
1967
1968         /* check for inconsistencies */
1969         if (clength != -1 && length != -1 && clength != length) {
1970                 http_seterr(HTTP_PROTOCOL_ERROR);
1971                 goto ouch;
1972         }
1973         if (clength == -1)
1974                 clength = length;
1975         if (clength != -1)
1976                 length = offset + clength;
1977         if (length != -1 && size != -1 && length != size) {
1978                 http_seterr(HTTP_PROTOCOL_ERROR);
1979                 goto ouch;
1980         }
1981         if (size == -1)
1982                 size = length;
1983
1984         /* fill in stats */
1985         if (us) {
1986                 us->size = size;
1987                 us->atime = us->mtime = mtime;
1988         }
1989
1990         /* too far? */
1991         if (URL->offset > 0 && offset > URL->offset) {
1992                 http_seterr(HTTP_PROTOCOL_ERROR);
1993                 goto ouch;
1994         }
1995
1996         /* report back real offset and size */
1997         URL->offset = offset;
1998         URL->length = clength;
1999
2000         /* wrap it up in a FILE */
2001         if ((f = http_funopen(conn, chunked)) == NULL) {
2002                 fetch_syserr();
2003                 goto ouch;
2004         }
2005
2006         if (url != URL)
2007                 fetchFreeURL(url);
2008         if (purl)
2009                 fetchFreeURL(purl);
2010
2011         if (HTTP_ERROR(conn->err)) {
2012                 http_print_html(stderr, f);
2013                 fclose(f);
2014                 f = NULL;
2015         }
2016         clean_http_headerbuf(&headerbuf);
2017         clean_http_auth_challenges(&server_challenges);
2018         clean_http_auth_challenges(&proxy_challenges);
2019         return (f);
2020
2021 ouch:
2022         if (url != URL)
2023                 fetchFreeURL(url);
2024         if (purl)
2025                 fetchFreeURL(purl);
2026         if (conn != NULL)
2027                 fetch_close(conn);
2028         clean_http_headerbuf(&headerbuf);
2029         clean_http_auth_challenges(&server_challenges);
2030         clean_http_auth_challenges(&proxy_challenges);
2031         return (NULL);
2032 }
2033
2034
2035 /*****************************************************************************
2036  * Entry points
2037  */
2038
2039 /*
2040  * Retrieve and stat a file by HTTP
2041  */
2042 FILE *
2043 fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags)
2044 {
2045         return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags));
2046 }
2047
2048 /*
2049  * Retrieve a file by HTTP
2050  */
2051 FILE *
2052 fetchGetHTTP(struct url *URL, const char *flags)
2053 {
2054         return (fetchXGetHTTP(URL, NULL, flags));
2055 }
2056
2057 /*
2058  * Store a file by HTTP
2059  */
2060 FILE *
2061 fetchPutHTTP(struct url *URL __unused, const char *flags __unused)
2062 {
2063         warnx("fetchPutHTTP(): not implemented");
2064         return (NULL);
2065 }
2066
2067 /*
2068  * Get an HTTP document's metadata
2069  */
2070 int
2071 fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags)
2072 {
2073         FILE *f;
2074
2075         f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags);
2076         if (f == NULL)
2077                 return (-1);
2078         fclose(f);
2079         return (0);
2080 }
2081
2082 /*
2083  * List a directory
2084  */
2085 struct url_ent *
2086 fetchListHTTP(struct url *url __unused, const char *flags __unused)
2087 {
2088         warnx("fetchListHTTP(): not implemented");
2089         return (NULL);
2090 }
2091
2092 FILE *
2093 fetchReqHTTP(struct url *URL, const char *method, const char *flags,
2094         const char *content_type, const char *body)
2095 {
2096
2097         return (http_request_body(URL, method, NULL, http_get_proxy(URL, flags),
2098             flags, content_type, body));
2099 }