libfetch: Remove an unused variable.
[dragonfly.git] / lib / libfetch / http.c
CommitLineData
984263bc 1/*-
5a71e1d2 2 * Copyright (c) 2000-2011 Dag-Erling Smørgrav
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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
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29/*
30 * The following copyright applies to the base64 code:
31 *
32 *-
33 * Copyright 1997 Massachusetts Institute of Technology
34 *
35 * Permission to use, copy, modify, and distribute this software and
36 * its documentation for any purpose and without fee is hereby
37 * granted, provided that both the above copyright notice and this
38 * permission notice appear in all copies, that both the above
39 * copyright notice and this permission notice appear in all
40 * supporting documentation, and that the name of M.I.T. not be used
41 * in advertising or publicity pertaining to distribution of the
42 * software without specific, written prior permission. M.I.T. makes
43 * no representations about the suitability of this software for any
44 * purpose. It is provided "as is" without express or implied
45 * warranty.
46 *
47 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
48 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
49 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
50 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
51 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
52 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
53 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
54 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
55 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
56 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
57 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 */
60
61#include <sys/param.h>
62#include <sys/socket.h>
30227130 63#include <sys/time.h>
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64
65#include <ctype.h>
66#include <err.h>
67#include <errno.h>
68#include <locale.h>
69#include <netdb.h>
70#include <stdarg.h>
71#include <stdio.h>
72#include <stdlib.h>
73#include <string.h>
74#include <time.h>
75#include <unistd.h>
76
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77#ifdef WITH_SSL
78#include <openssl/md5.h>
79#define MD5Init(c) MD5_Init(c)
80#define MD5Update(c, data, len) MD5_Update(c, data, len)
81#define MD5Final(md, c) MD5_Final(md, c)
82#else
83#include <md5.h>
84#endif
85
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86#include <netinet/in.h>
87#include <netinet/tcp.h>
88
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89#include "fetch.h"
90#include "common.h"
91#include "httperr.h"
92
93/* Maximum number of redirects to follow */
884e58fc 94#define MAX_REDIRECT 20
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95
96/* Symbolic names for reply codes we care about */
97#define HTTP_OK 200
98#define HTTP_PARTIAL 206
99#define HTTP_MOVED_PERM 301
100#define HTTP_MOVED_TEMP 302
101#define HTTP_SEE_OTHER 303
30227130 102#define HTTP_NOT_MODIFIED 304
5a71e1d2 103#define HTTP_USE_PROXY 305
54e9236d 104#define HTTP_TEMP_REDIRECT 307
5a71e1d2 105#define HTTP_PERM_REDIRECT 308
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106#define HTTP_NEED_AUTH 401
107#define HTTP_NEED_PROXY_AUTH 407
54e9236d 108#define HTTP_BAD_RANGE 416
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109#define HTTP_PROTOCOL_ERROR 999
110
111#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
112 || (xyz) == HTTP_MOVED_TEMP \
54e9236d 113 || (xyz) == HTTP_TEMP_REDIRECT \
5a71e1d2 114 || (xyz) == HTTP_USE_PROXY \
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115 || (xyz) == HTTP_SEE_OTHER)
116
117#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599)
118
119
120/*****************************************************************************
121 * I/O functions for decoding chunked streams
122 */
123
124struct httpio
125{
126 conn_t *conn; /* connection */
127 int chunked; /* chunked mode */
128 char *buf; /* chunk buffer */
129 size_t bufsize; /* size of chunk buffer */
130 ssize_t buflen; /* amount of data currently in buffer */
131 int bufpos; /* current read offset in buffer */
132 int eof; /* end-of-file flag */
133 int error; /* error flag */
134 size_t chunksize; /* remaining size of current chunk */
135#ifndef NDEBUG
136 size_t total;
137#endif
138};
139
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140static int http_cmd(conn_t *, const char *, ...) __printflike(2, 3);
141
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142/*
143 * Get next chunk header
144 */
145static int
30227130 146http_new_chunk(struct httpio *io)
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147{
148 char *p;
149
30227130 150 if (fetch_getln(io->conn) == -1)
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151 return (-1);
152
30227130 153 if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf))
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154 return (-1);
155
30227130 156 for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) {
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157 if (*p == ';')
158 break;
30227130 159 if (!isxdigit((unsigned char)*p))
984263bc 160 return (-1);
30227130 161 if (isdigit((unsigned char)*p)) {
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162 io->chunksize = io->chunksize * 16 +
163 *p - '0';
164 } else {
165 io->chunksize = io->chunksize * 16 +
30227130 166 10 + tolower((unsigned char)*p) - 'a';
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167 }
168 }
169
170#ifndef NDEBUG
171 if (fetchDebug) {
172 io->total += io->chunksize;
173 if (io->chunksize == 0)
174 fprintf(stderr, "%s(): end of last chunk\n", __func__);
175 else
176 fprintf(stderr, "%s(): new chunk: %lu (%lu)\n",
177 __func__, (unsigned long)io->chunksize,
178 (unsigned long)io->total);
179 }
180#endif
181
182 return (io->chunksize);
183}
184
185/*
186 * Grow the input buffer to at least len bytes
187 */
188static inline int
30227130 189http_growbuf(struct httpio *io, size_t len)
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190{
191 char *tmp;
192
193 if (io->bufsize >= len)
194 return (0);
195
196 if ((tmp = realloc(io->buf, len)) == NULL)
197 return (-1);
198 io->buf = tmp;
199 io->bufsize = len;
200 return (0);
201}
202
203/*
204 * Fill the input buffer, do chunk decoding on the fly
205 */
206static int
30227130 207http_fillbuf(struct httpio *io, size_t len)
984263bc 208{
3eca4227
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209 ssize_t nbytes;
210
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211 if (io->error)
212 return (-1);
213 if (io->eof)
214 return (0);
215
216 if (io->chunked == 0) {
30227130 217 if (http_growbuf(io, len) == -1)
984263bc 218 return (-1);
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219 if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) {
220 io->error = errno;
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221 return (-1);
222 }
3eca4227 223 io->buflen = nbytes;
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224 io->bufpos = 0;
225 return (io->buflen);
226 }
227
228 if (io->chunksize == 0) {
30227130 229 switch (http_new_chunk(io)) {
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230 case -1:
231 io->error = 1;
232 return (-1);
233 case 0:
234 io->eof = 1;
235 return (0);
236 }
237 }
238
239 if (len > io->chunksize)
240 len = io->chunksize;
30227130 241 if (http_growbuf(io, len) == -1)
984263bc 242 return (-1);
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243 if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) {
244 io->error = errno;
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245 return (-1);
246 }
3eca4227 247 io->buflen = nbytes;
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248 io->chunksize -= io->buflen;
249
250 if (io->chunksize == 0) {
251 char endl[2];
252
30227130 253 if (fetch_read(io->conn, endl, 2) != 2 ||
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254 endl[0] != '\r' || endl[1] != '\n')
255 return (-1);
256 }
257
258 io->bufpos = 0;
259
260 return (io->buflen);
261}
262
263/*
264 * Read function
265 */
266static int
30227130 267http_readfn(void *v, char *buf, int len)
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268{
269 struct httpio *io = (struct httpio *)v;
270 int l, pos;
271
272 if (io->error)
273 return (-1);
274 if (io->eof)
275 return (0);
276
277 for (pos = 0; len > 0; pos += l, len -= l) {
278 /* empty buffer */
279 if (!io->buf || io->bufpos == io->buflen)
30227130 280 if (http_fillbuf(io, len) < 1)
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281 break;
282 l = io->buflen - io->bufpos;
283 if (len < l)
284 l = len;
30227130 285 memcpy(buf + pos, io->buf + io->bufpos, l);
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286 io->bufpos += l;
287 }
288
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289 if (!pos && io->error) {
290 if (io->error == EINTR)
291 io->error = 0;
984263bc 292 return (-1);
3eca4227 293 }
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294 return (pos);
295}
296
297/*
298 * Write function
299 */
300static int
30227130 301http_writefn(void *v, const char *buf, int len)
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302{
303 struct httpio *io = (struct httpio *)v;
304
30227130 305 return (fetch_write(io->conn, buf, len));
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306}
307
308/*
309 * Close function
310 */
311static int
30227130 312http_closefn(void *v)
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313{
314 struct httpio *io = (struct httpio *)v;
315 int r;
316
30227130 317 r = fetch_close(io->conn);
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318 if (io->buf)
319 free(io->buf);
320 free(io);
321 return (r);
322}
323
324/*
325 * Wrap a file descriptor up
326 */
327static FILE *
30227130 328http_funopen(conn_t *conn, int chunked)
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329{
330 struct httpio *io;
331 FILE *f;
332
333 if ((io = calloc(1, sizeof(*io))) == NULL) {
30227130 334 fetch_syserr();
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335 return (NULL);
336 }
337 io->conn = conn;
338 io->chunked = chunked;
30227130 339 f = funopen(io, http_readfn, http_writefn, NULL, http_closefn);
984263bc 340 if (f == NULL) {
30227130 341 fetch_syserr();
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342 free(io);
343 return (NULL);
344 }
345 return (f);
346}
347
348
349/*****************************************************************************
350 * Helper functions for talking to the server and parsing its replies
351 */
352
353/* Header types */
354typedef enum {
355 hdr_syserror = -2,
356 hdr_error = -1,
357 hdr_end = 0,
358 hdr_unknown = 1,
359 hdr_content_length,
360 hdr_content_range,
361 hdr_last_modified,
362 hdr_location,
363 hdr_transfer_encoding,
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364 hdr_www_authenticate,
365 hdr_proxy_authenticate,
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366} hdr_t;
367
368/* Names of interesting headers */
369static struct {
370 hdr_t num;
371 const char *name;
372} hdr_names[] = {
373 { hdr_content_length, "Content-Length" },
374 { hdr_content_range, "Content-Range" },
375 { hdr_last_modified, "Last-Modified" },
376 { hdr_location, "Location" },
377 { hdr_transfer_encoding, "Transfer-Encoding" },
378 { hdr_www_authenticate, "WWW-Authenticate" },
5a71e1d2 379 { hdr_proxy_authenticate, "Proxy-Authenticate" },
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380 { hdr_unknown, NULL },
381};
382
383/*
384 * Send a formatted line; optionally echo to terminal
385 */
386static int
30227130 387http_cmd(conn_t *conn, const char *fmt, ...)
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388{
389 va_list ap;
390 size_t len;
391 char *msg;
392 int r;
393
394 va_start(ap, fmt);
395 len = vasprintf(&msg, fmt, ap);
396 va_end(ap);
397
398 if (msg == NULL) {
399 errno = ENOMEM;
30227130 400 fetch_syserr();
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401 return (-1);
402 }
403
30227130 404 r = fetch_putln(conn, msg, len);
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405 free(msg);
406
407 if (r == -1) {
30227130 408 fetch_syserr();
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409 return (-1);
410 }
411
412 return (0);
413}
414
415/*
416 * Get and parse status line
417 */
418static int
30227130 419http_get_reply(conn_t *conn)
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420{
421 char *p;
422
30227130 423 if (fetch_getln(conn) == -1)
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424 return (-1);
425 /*
426 * A valid status line looks like "HTTP/m.n xyz reason" where m
427 * and n are the major and minor protocol version numbers and xyz
428 * is the reply code.
429 * Unfortunately, there are servers out there (NCSA 1.5.1, to name
430 * just one) that do not send a version number, so we can't rely
431 * on finding one, but if we do, insist on it being 1.0 or 1.1.
432 * We don't care about the reason phrase.
433 */
434 if (strncmp(conn->buf, "HTTP", 4) != 0)
435 return (HTTP_PROTOCOL_ERROR);
436 p = conn->buf + 4;
437 if (*p == '/') {
438 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1'))
439 return (HTTP_PROTOCOL_ERROR);
440 p += 4;
441 }
30227130
SW
442 if (*p != ' ' ||
443 !isdigit((unsigned char)p[1]) ||
444 !isdigit((unsigned char)p[2]) ||
445 !isdigit((unsigned char)p[3]))
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446 return (HTTP_PROTOCOL_ERROR);
447
448 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0');
449 return (conn->err);
450}
451
452/*
453 * Check a header; if the type matches the given string, return a pointer
454 * to the beginning of the value.
455 */
456static const char *
30227130 457http_match(const char *str, const char *hdr)
984263bc 458{
30227130
SW
459 while (*str && *hdr &&
460 tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++))
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461 /* nothing */;
462 if (*str || *hdr != ':')
463 return (NULL);
30227130 464 while (*hdr && isspace((unsigned char)*++hdr))
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465 /* nothing */;
466 return (hdr);
467}
468
5a71e1d2 469
984263bc 470/*
5a71e1d2
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471 * Get the next header and return the appropriate symbolic code. We
472 * need to read one line ahead for checking for a continuation line
473 * belonging to the current header (continuation lines start with
474 * white space).
475 *
476 * We get called with a fresh line already in the conn buffer, either
477 * from the previous http_next_header() invocation, or, the first
478 * time, from a fetch_getln() performed by our caller.
479 *
480 * This stops when we encounter an empty line (we dont read beyond the header
481 * area).
482 *
483 * Note that the "headerbuf" is just a place to return the result. Its
484 * contents are not used for the next call. This means that no cleanup
485 * is needed when ie doing another connection, just call the cleanup when
486 * fully done to deallocate memory.
984263bc 487 */
5a71e1d2
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488
489/* Limit the max number of continuation lines to some reasonable value */
490#define HTTP_MAX_CONT_LINES 10
491
492/* Place into which to build a header from one or several lines */
493typedef struct {
494 char *buf; /* buffer */
495 size_t bufsize; /* buffer size */
496 size_t buflen; /* length of buffer contents */
497} http_headerbuf_t;
498
499static void
500init_http_headerbuf(http_headerbuf_t *buf)
984263bc 501{
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502 buf->buf = NULL;
503 buf->bufsize = 0;
504 buf->buflen = 0;
505}
984263bc 506
5a71e1d2
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507static void
508clean_http_headerbuf(http_headerbuf_t *buf)
509{
510 if (buf->buf)
511 free(buf->buf);
512 init_http_headerbuf(buf);
513}
514
515/* Remove whitespace at the end of the buffer */
516static void
517http_conn_trimright(conn_t *conn)
518{
519 while (conn->buflen &&
520 isspace((unsigned char)conn->buf[conn->buflen - 1]))
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521 conn->buflen--;
522 conn->buf[conn->buflen] = '\0';
5a71e1d2
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523}
524
525static hdr_t
526http_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p)
527{
528 unsigned int i, len;
529
530 /*
531 * Have to do the stripping here because of the first line. So
532 * it's done twice for the subsequent lines. No big deal
533 */
534 http_conn_trimright(conn);
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535 if (conn->buflen == 0)
536 return (hdr_end);
5a71e1d2
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537
538 /* Copy the line to the headerbuf */
539 if (hbuf->bufsize < conn->buflen + 1) {
540 if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL)
541 return (hdr_syserror);
542 hbuf->bufsize = conn->buflen + 1;
543 }
544 strcpy(hbuf->buf, conn->buf);
545 hbuf->buflen = conn->buflen;
546
547 /*
548 * Fetch possible continuation lines. Stop at 1st non-continuation
549 * and leave it in the conn buffer
550 */
551 for (i = 0; i < HTTP_MAX_CONT_LINES; i++) {
552 if (fetch_getln(conn) == -1)
553 return (hdr_syserror);
554
555 /*
556 * Note: we carry on the idea from the previous version
557 * that a pure whitespace line is equivalent to an empty
558 * one (so it's not continuation and will be handled when
559 * we are called next)
560 */
561 http_conn_trimright(conn);
562 if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0])
563 break;
564
565 /* Got a continuation line. Concatenate to previous */
566 len = hbuf->buflen + conn->buflen;
567 if (hbuf->bufsize < len + 1) {
568 len *= 2;
569 if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL)
570 return (hdr_syserror);
571 hbuf->bufsize = len + 1;
572 }
573 strcpy(hbuf->buf + hbuf->buflen, conn->buf);
574 hbuf->buflen += conn->buflen;
575 }
576
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577 /*
578 * We could check for malformed headers but we don't really care.
579 * A valid header starts with a token immediately followed by a
580 * colon; a token is any sequence of non-control, non-whitespace
581 * characters except "()<>@,;:\\\"{}".
582 */
583 for (i = 0; hdr_names[i].num != hdr_unknown; i++)
5a71e1d2 584 if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL)
984263bc 585 return (hdr_names[i].num);
5a71e1d2 586
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587 return (hdr_unknown);
588}
589
5a71e1d2
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590/**************************
591 * [Proxy-]Authenticate header parsing
592 */
593
594/*
595 * Read doublequote-delimited string into output buffer obuf (allocated
596 * by caller, whose responsibility it is to ensure that it's big enough)
597 * cp points to the first char after the initial '"'
598 * Handles \ quoting
599 * Returns pointer to the first char after the terminating double quote, or
600 * NULL for error.
601 */
602static const char *
603http_parse_headerstring(const char *cp, char *obuf)
604{
605 for (;;) {
606 switch (*cp) {
607 case 0: /* Unterminated string */
608 *obuf = 0;
609 return (NULL);
610 case '"': /* Ending quote */
611 *obuf = 0;
612 return (++cp);
613 case '\\':
614 if (*++cp == 0) {
615 *obuf = 0;
616 return (NULL);
617 }
618 /* FALLTHROUGH */
619 default:
620 *obuf++ = *cp++;
621 }
622 }
623}
624
625/* Http auth challenge schemes */
626typedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t;
627
628/* Data holder for a Basic or Digest challenge. */
629typedef struct {
630 http_auth_schemes_t scheme;
631 char *realm;
632 char *qop;
633 char *nonce;
634 char *opaque;
635 char *algo;
636 int stale;
637 int nc; /* Nonce count */
638} http_auth_challenge_t;
639
640static void
641init_http_auth_challenge(http_auth_challenge_t *b)
642{
643 b->scheme = HTTPAS_UNKNOWN;
644 b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL;
645 b->stale = b->nc = 0;
646}
647
648static void
649clean_http_auth_challenge(http_auth_challenge_t *b)
650{
651 if (b->realm)
652 free(b->realm);
653 if (b->qop)
654 free(b->qop);
655 if (b->nonce)
656 free(b->nonce);
657 if (b->opaque)
658 free(b->opaque);
659 if (b->algo)
660 free(b->algo);
661 init_http_auth_challenge(b);
662}
663
664/* Data holder for an array of challenges offered in an http response. */
665#define MAX_CHALLENGES 10
666typedef struct {
667 http_auth_challenge_t *challenges[MAX_CHALLENGES];
668 int count; /* Number of parsed challenges in the array */
669 int valid; /* We did parse an authenticate header */
670} http_auth_challenges_t;
671
672static void
673init_http_auth_challenges(http_auth_challenges_t *cs)
674{
675 int i;
676 for (i = 0; i < MAX_CHALLENGES; i++)
677 cs->challenges[i] = NULL;
678 cs->count = cs->valid = 0;
679}
680
681static void
682clean_http_auth_challenges(http_auth_challenges_t *cs)
683{
684 int i;
685 /* We rely on non-zero pointers being allocated, not on the count */
686 for (i = 0; i < MAX_CHALLENGES; i++) {
687 if (cs->challenges[i] != NULL) {
688 clean_http_auth_challenge(cs->challenges[i]);
689 free(cs->challenges[i]);
690 }
691 }
692 init_http_auth_challenges(cs);
693}
694
695/*
696 * Enumeration for lexical elements. Separators will be returned as their own
697 * ascii value
698 */
699typedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258,
700 HTTPHL_ERROR = 259} http_header_lex_t;
701
702/*
703 * Determine what kind of token comes next and return possible value
704 * in buf, which is supposed to have been allocated big enough by
705 * caller. Advance input pointer and return element type.
706 */
707static int
708http_header_lex(const char **cpp, char *buf)
709{
710 size_t l;
711 /* Eat initial whitespace */
712 *cpp += strspn(*cpp, " \t");
713 if (**cpp == 0)
714 return (HTTPHL_END);
715
716 /* Separator ? */
717 if (**cpp == ',' || **cpp == '=')
718 return (*((*cpp)++));
719
720 /* String ? */
721 if (**cpp == '"') {
722 *cpp = http_parse_headerstring(++*cpp, buf);
723 if (*cpp == NULL)
724 return (HTTPHL_ERROR);
725 return (HTTPHL_STRING);
726 }
727
728 /* Read other token, until separator or whitespace */
729 l = strcspn(*cpp, " \t,=");
730 memcpy(buf, *cpp, l);
731 buf[l] = 0;
732 *cpp += l;
733 return (HTTPHL_WORD);
734}
735
736/*
737 * Read challenges from http xxx-authenticate header and accumulate them
738 * in the challenges list structure.
739 *
740 * Headers with multiple challenges are specified by rfc2617, but
741 * servers (ie: squid) often send them in separate headers instead,
742 * which in turn is forbidden by the http spec (multiple headers with
743 * the same name are only allowed for pure comma-separated lists, see
744 * rfc2616 sec 4.2).
745 *
746 * We support both approaches anyway
747 */
748static int
749http_parse_authenticate(const char *cp, http_auth_challenges_t *cs)
750{
751 int ret = -1;
752 http_header_lex_t lex;
753 char *key = malloc(strlen(cp) + 1);
754 char *value = malloc(strlen(cp) + 1);
755 char *buf = malloc(strlen(cp) + 1);
756
757 if (key == NULL || value == NULL || buf == NULL) {
758 fetch_syserr();
759 goto out;
760 }
761
762 /* In any case we've seen the header and we set the valid bit */
763 cs->valid = 1;
764
765 /* Need word first */
766 lex = http_header_lex(&cp, key);
767 if (lex != HTTPHL_WORD)
768 goto out;
769
770 /* Loop on challenges */
771 for (; cs->count < MAX_CHALLENGES; cs->count++) {
772 cs->challenges[cs->count] =
773 malloc(sizeof(http_auth_challenge_t));
774 if (cs->challenges[cs->count] == NULL) {
775 fetch_syserr();
776 goto out;
777 }
778 init_http_auth_challenge(cs->challenges[cs->count]);
779 if (!strcasecmp(key, "basic")) {
780 cs->challenges[cs->count]->scheme = HTTPAS_BASIC;
781 } else if (!strcasecmp(key, "digest")) {
782 cs->challenges[cs->count]->scheme = HTTPAS_DIGEST;
783 } else {
784 cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN;
785 /*
786 * Continue parsing as basic or digest may
787 * follow, and the syntax is the same for
788 * all. We'll just ignore this one when
789 * looking at the list
790 */
791 }
792
793 /* Loop on attributes */
794 for (;;) {
795 /* Key */
796 lex = http_header_lex(&cp, key);
797 if (lex != HTTPHL_WORD)
798 goto out;
799
800 /* Equal sign */
801 lex = http_header_lex(&cp, buf);
802 if (lex != '=')
803 goto out;
804
805 /* Value */
806 lex = http_header_lex(&cp, value);
807 if (lex != HTTPHL_WORD && lex != HTTPHL_STRING)
808 goto out;
809
810 if (!strcasecmp(key, "realm"))
811 cs->challenges[cs->count]->realm =
812 strdup(value);
813 else if (!strcasecmp(key, "qop"))
814 cs->challenges[cs->count]->qop =
815 strdup(value);
816 else if (!strcasecmp(key, "nonce"))
817 cs->challenges[cs->count]->nonce =
818 strdup(value);
819 else if (!strcasecmp(key, "opaque"))
820 cs->challenges[cs->count]->opaque =
821 strdup(value);
822 else if (!strcasecmp(key, "algorithm"))
823 cs->challenges[cs->count]->algo =
824 strdup(value);
825 else if (!strcasecmp(key, "stale"))
826 cs->challenges[cs->count]->stale =
827 strcasecmp(value, "no");
828 /* Else ignore unknown attributes */
829
830 /* Comma or Next challenge or End */
831 lex = http_header_lex(&cp, key);
832 /*
833 * If we get a word here, this is the beginning of the
834 * next challenge. Break the attributes loop
835 */
836 if (lex == HTTPHL_WORD)
837 break;
838
839 if (lex == HTTPHL_END) {
840 /* End while looking for ',' is normal exit */
841 cs->count++;
842 ret = 0;
843 goto out;
844 }
845 /* Anything else is an error */
846 if (lex != ',')
847 goto out;
848
849 } /* End attributes loop */
850 } /* End challenge loop */
851
852 /*
853 * Challenges max count exceeded. This really can't happen
854 * with normal data, something's fishy -> error
855 */
856
857out:
858 if (key)
859 free(key);
860 if (value)
861 free(value);
862 if (buf)
863 free(buf);
864 return (ret);
865}
866
867
984263bc
MD
868/*
869 * Parse a last-modified header
870 */
871static int
30227130 872http_parse_mtime(const char *p, time_t *mtime)
984263bc
MD
873{
874 char locale[64], *r;
875 struct tm tm;
876
877 strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale));
878 setlocale(LC_TIME, "C");
879 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
880 /* XXX should add support for date-2 and date-3 */
881 setlocale(LC_TIME, locale);
882 if (r == NULL)
883 return (-1);
884 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d "
885 "%02d:%02d:%02d]\n",
886 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
887 tm.tm_hour, tm.tm_min, tm.tm_sec));
888 *mtime = timegm(&tm);
889 return (0);
890}
891
892/*
893 * Parse a content-length header
894 */
895static int
30227130 896http_parse_length(const char *p, off_t *length)
984263bc
MD
897{
898 off_t len;
899
30227130 900 for (len = 0; *p && isdigit((unsigned char)*p); ++p)
984263bc
MD
901 len = len * 10 + (*p - '0');
902 if (*p)
903 return (-1);
904 DEBUG(fprintf(stderr, "content length: [%lld]\n",
905 (long long)len));
906 *length = len;
907 return (0);
908}
909
910/*
911 * Parse a content-range header
912 */
913static int
30227130 914http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size)
984263bc
MD
915{
916 off_t first, last, len;
917
918 if (strncasecmp(p, "bytes ", 6) != 0)
919 return (-1);
54e9236d
SW
920 p += 6;
921 if (*p == '*') {
922 first = last = -1;
923 ++p;
924 } else {
30227130 925 for (first = 0; *p && isdigit((unsigned char)*p); ++p)
54e9236d
SW
926 first = first * 10 + *p - '0';
927 if (*p != '-')
928 return (-1);
30227130 929 for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p)
54e9236d
SW
930 last = last * 10 + *p - '0';
931 }
984263bc
MD
932 if (first > last || *p != '/')
933 return (-1);
30227130 934 for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p)
984263bc
MD
935 len = len * 10 + *p - '0';
936 if (*p || len < last - first + 1)
937 return (-1);
54e9236d
SW
938 if (first == -1) {
939 DEBUG(fprintf(stderr, "content range: [*/%lld]\n",
940 (long long)len));
941 *length = 0;
942 } else {
943 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n",
944 (long long)first, (long long)last, (long long)len));
945 *length = last - first + 1;
946 }
984263bc 947 *offset = first;
984263bc
MD
948 *size = len;
949 return (0);
950}
951
952
953/*****************************************************************************
954 * Helper functions for authorization
955 */
956
957/*
958 * Base64 encoding
959 */
960static char *
30227130 961http_base64(const char *src)
984263bc
MD
962{
963 static const char base64[] =
964 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
965 "abcdefghijklmnopqrstuvwxyz"
966 "0123456789+/";
967 char *str, *dst;
968 size_t l;
969 int t, r;
970
971 l = strlen(src);
54e9236d 972 if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL)
984263bc
MD
973 return (NULL);
974 dst = str;
975 r = 0;
976
977 while (l >= 3) {
978 t = (src[0] << 16) | (src[1] << 8) | src[2];
979 dst[0] = base64[(t >> 18) & 0x3f];
980 dst[1] = base64[(t >> 12) & 0x3f];
981 dst[2] = base64[(t >> 6) & 0x3f];
982 dst[3] = base64[(t >> 0) & 0x3f];
983 src += 3; l -= 3;
984 dst += 4; r += 4;
985 }
986
987 switch (l) {
988 case 2:
989 t = (src[0] << 16) | (src[1] << 8);
990 dst[0] = base64[(t >> 18) & 0x3f];
991 dst[1] = base64[(t >> 12) & 0x3f];
992 dst[2] = base64[(t >> 6) & 0x3f];
993 dst[3] = '=';
994 dst += 4;
995 r += 4;
996 break;
997 case 1:
998 t = src[0] << 16;
999 dst[0] = base64[(t >> 18) & 0x3f];
1000 dst[1] = base64[(t >> 12) & 0x3f];
1001 dst[2] = dst[3] = '=';
1002 dst += 4;
1003 r += 4;
1004 break;
1005 case 0:
1006 break;
1007 }
1008
1009 *dst = 0;
1010 return (str);
1011}
1012
5a71e1d2
JM
1013
1014/*
1015 * Extract authorization parameters from environment value.
1016 * The value is like scheme:realm:user:pass
1017 */
1018typedef struct {
1019 char *scheme;
1020 char *realm;
1021 char *user;
1022 char *password;
1023} http_auth_params_t;
1024
1025static void
1026init_http_auth_params(http_auth_params_t *s)
1027{
1028 s->scheme = s->realm = s->user = s->password = 0;
1029}
1030
1031static void
1032clean_http_auth_params(http_auth_params_t *s)
1033{
1034 if (s->scheme)
1035 free(s->scheme);
1036 if (s->realm)
1037 free(s->realm);
1038 if (s->user)
1039 free(s->user);
1040 if (s->password)
1041 free(s->password);
1042 init_http_auth_params(s);
1043}
1044
1045static int
1046http_authfromenv(const char *p, http_auth_params_t *parms)
1047{
1048 int ret = -1;
1049 char *v, *ve;
1050 char *str = strdup(p);
1051
1052 if (str == NULL) {
1053 fetch_syserr();
1054 return (-1);
1055 }
1056 v = str;
1057
1058 if ((ve = strchr(v, ':')) == NULL)
1059 goto out;
1060
1061 *ve = 0;
1062 if ((parms->scheme = strdup(v)) == NULL) {
1063 fetch_syserr();
1064 goto out;
1065 }
1066 v = ve + 1;
1067
1068 if ((ve = strchr(v, ':')) == NULL)
1069 goto out;
1070
1071 *ve = 0;
1072 if ((parms->realm = strdup(v)) == NULL) {
1073 fetch_syserr();
1074 goto out;
1075 }
1076 v = ve + 1;
1077
1078 if ((ve = strchr(v, ':')) == NULL)
1079 goto out;
1080
1081 *ve = 0;
1082 if ((parms->user = strdup(v)) == NULL) {
1083 fetch_syserr();
1084 goto out;
1085 }
1086 v = ve + 1;
1087
1088
1089 if ((parms->password = strdup(v)) == NULL) {
1090 fetch_syserr();
1091 goto out;
1092 }
1093 ret = 0;
1094out:
1095 if (ret == -1)
1096 clean_http_auth_params(parms);
1097 if (str)
1098 free(str);
1099 return (ret);
1100}
1101
1102
1103/*
1104 * Digest response: the code to compute the digest is taken from the
1105 * sample implementation in RFC2616
1106 */
1107#define IN const
1108#define OUT
1109
1110#define HASHLEN 16
1111typedef char HASH[HASHLEN];
1112#define HASHHEXLEN 32
1113typedef char HASHHEX[HASHHEXLEN+1];
1114
1115static const char *hexchars = "0123456789abcdef";
1116static void
1117CvtHex(IN HASH Bin, OUT HASHHEX Hex)
1118{
1119 unsigned short i;
1120 unsigned char j;
1121
1122 for (i = 0; i < HASHLEN; i++) {
1123 j = (Bin[i] >> 4) & 0xf;
1124 Hex[i*2] = hexchars[j];
1125 j = Bin[i] & 0xf;
1126 Hex[i*2+1] = hexchars[j];
1127 };
1128 Hex[HASHHEXLEN] = '\0';
1129};
1130
1131/* calculate H(A1) as per spec */
1132static void
1133DigestCalcHA1(
1134 IN char * pszAlg,
1135 IN char * pszUserName,
1136 IN char * pszRealm,
1137 IN char * pszPassword,
1138 IN char * pszNonce,
1139 IN char * pszCNonce,
1140 OUT HASHHEX SessionKey
1141 )
1142{
1143 MD5_CTX Md5Ctx;
1144 HASH HA1;
1145
1146 MD5Init(&Md5Ctx);
1147 MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName));
1148 MD5Update(&Md5Ctx, ":", 1);
1149 MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm));
1150 MD5Update(&Md5Ctx, ":", 1);
1151 MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword));
1152 MD5Final(HA1, &Md5Ctx);
1153 if (strcasecmp(pszAlg, "md5-sess") == 0) {
1154
1155 MD5Init(&Md5Ctx);
1156 MD5Update(&Md5Ctx, HA1, HASHLEN);
1157 MD5Update(&Md5Ctx, ":", 1);
1158 MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce));
1159 MD5Update(&Md5Ctx, ":", 1);
1160 MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce));
1161 MD5Final(HA1, &Md5Ctx);
1162 };
1163 CvtHex(HA1, SessionKey);
1164}
1165
1166/* calculate request-digest/response-digest as per HTTP Digest spec */
1167static void
1168DigestCalcResponse(
1169 IN HASHHEX HA1, /* H(A1) */
1170 IN char * pszNonce, /* nonce from server */
1171 IN char * pszNonceCount, /* 8 hex digits */
1172 IN char * pszCNonce, /* client nonce */
1173 IN char * pszQop, /* qop-value: "", "auth", "auth-int" */
1174 IN char * pszMethod, /* method from the request */
1175 IN char * pszDigestUri, /* requested URL */
1176 IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */
1177 OUT HASHHEX Response /* request-digest or response-digest */
1178 )
1179{
1180/* DEBUG(fprintf(stderr,
1181 "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n",
1182 HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/
1183 MD5_CTX Md5Ctx;
1184 HASH HA2;
1185 HASH RespHash;
1186 HASHHEX HA2Hex;
1187
1188 // calculate H(A2)
1189 MD5Init(&Md5Ctx);
1190 MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod));
1191 MD5Update(&Md5Ctx, ":", 1);
1192 MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri));
1193 if (strcasecmp(pszQop, "auth-int") == 0) {
1194 MD5Update(&Md5Ctx, ":", 1);
1195 MD5Update(&Md5Ctx, HEntity, HASHHEXLEN);
1196 };
1197 MD5Final(HA2, &Md5Ctx);
1198 CvtHex(HA2, HA2Hex);
1199
1200 // calculate response
1201 MD5Init(&Md5Ctx);
1202 MD5Update(&Md5Ctx, HA1, HASHHEXLEN);
1203 MD5Update(&Md5Ctx, ":", 1);
1204 MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce));
1205 MD5Update(&Md5Ctx, ":", 1);
1206 if (*pszQop) {
1207 MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount));
1208 MD5Update(&Md5Ctx, ":", 1);
1209 MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce));
1210 MD5Update(&Md5Ctx, ":", 1);
1211 MD5Update(&Md5Ctx, pszQop, strlen(pszQop));
1212 MD5Update(&Md5Ctx, ":", 1);
1213 };
1214 MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN);
1215 MD5Final(RespHash, &Md5Ctx);
1216 CvtHex(RespHash, Response);
1217}
1218
1219/*
1220 * Generate/Send a Digest authorization header
1221 * This looks like: [Proxy-]Authorization: credentials
1222 *
1223 * credentials = "Digest" digest-response
1224 * digest-response = 1#( username | realm | nonce | digest-uri
1225 * | response | [ algorithm ] | [cnonce] |
1226 * [opaque] | [message-qop] |
1227 * [nonce-count] | [auth-param] )
1228 * username = "username" "=" username-value
1229 * username-value = quoted-string
1230 * digest-uri = "uri" "=" digest-uri-value
1231 * digest-uri-value = request-uri ; As specified by HTTP/1.1
1232 * message-qop = "qop" "=" qop-value
1233 * cnonce = "cnonce" "=" cnonce-value
1234 * cnonce-value = nonce-value
1235 * nonce-count = "nc" "=" nc-value
1236 * nc-value = 8LHEX
1237 * response = "response" "=" request-digest
1238 * request-digest = <"> 32LHEX <">
1239 */
1240static int
1241http_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c,
1242 http_auth_params_t *parms, struct url *url)
1243{
1244 int r;
1245 char noncecount[10];
1246 char cnonce[40];
1247 char *options = 0;
1248
1249 if (!c->realm || !c->nonce) {
1250 DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n"));
1251 return(-1);
1252 }
1253 if (!c->algo)
1254 c->algo = strdup("");
1255
1256 if (asprintf(&options, "%s%s%s%s",
1257 *c->algo? ",algorithm=" : "", c->algo,
1258 c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1)
1259 return (-1);
1260
1261 if (!c->qop) {
1262 c->qop = strdup("");
1263 *noncecount = 0;
1264 *cnonce = 0;
1265 } else {
1266 c->nc++;
1267 sprintf(noncecount, "%08x", c->nc);
1268 /* We don't try very hard with the cnonce ... */
1269 sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0));
1270 }
1271
1272 HASHHEX HA1;
1273 DigestCalcHA1(c->algo, parms->user, c->realm,
1274 parms->password, c->nonce, cnonce, HA1);
1275 DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1));
1276 HASHHEX digest;
1277 DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop,
1278 "GET", url->doc, "", digest);
1279
1280 if (c->qop[0]) {
1281 r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\","
1282 "nonce=\"%s\",uri=\"%s\",response=\"%s\","
1283 "qop=\"auth\", cnonce=\"%s\", nc=%s%s",
1284 hdr, parms->user, c->realm,
1285 c->nonce, url->doc, digest,
1286 cnonce, noncecount, options);
1287 } else {
1288 r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\","
1289 "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s",
1290 hdr, parms->user, c->realm,
1291 c->nonce, url->doc, digest, options);
1292 }
1293 if (options)
1294 free(options);
1295 return (r);
1296}
1297
984263bc
MD
1298/*
1299 * Encode username and password
1300 */
1301static int
30227130 1302http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd)
984263bc
MD
1303{
1304 char *upw, *auth;
1305 int r;
1306
5a71e1d2
JM
1307 DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr));
1308 DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd));
984263bc
MD
1309 if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
1310 return (-1);
30227130 1311 auth = http_base64(upw);
984263bc
MD
1312 free(upw);
1313 if (auth == NULL)
1314 return (-1);
30227130 1315 r = http_cmd(conn, "%s: Basic %s", hdr, auth);
984263bc
MD
1316 free(auth);
1317 return (r);
1318}
1319
1320/*
5a71e1d2
JM
1321 * Chose the challenge to answer and call the appropriate routine to
1322 * produce the header.
984263bc
MD
1323 */
1324static int
5a71e1d2
JM
1325http_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs,
1326 http_auth_params_t *parms, struct url *url)
984263bc 1327{
5a71e1d2
JM
1328 http_auth_challenge_t *digest = NULL;
1329 int i;
1330
1331 /* If user or pass are null we're not happy */
1332 if (!parms->user || !parms->password) {
1333 DEBUG(fprintf(stderr, "NULL usr or pass\n"));
1334 return (-1);
984263bc 1335 }
984263bc 1336
636eca08 1337 /* Look for a Digest */
5a71e1d2 1338 for (i = 0; i < cs->count; i++) {
5a71e1d2
JM
1339 if (cs->challenges[i]->scheme == HTTPAS_DIGEST)
1340 digest = cs->challenges[i];
1341 }
1342
1343 /* Error if "Digest" was specified and there is no Digest challenge */
1344 if (!digest && (parms->scheme &&
1345 !strcasecmp(parms->scheme, "digest"))) {
1346 DEBUG(fprintf(stderr,
1347 "Digest auth in env, not supported by peer\n"));
1348 return (-1);
1349 }
1350 /*
1351 * If "basic" was specified in the environment, or there is no Digest
1352 * challenge, do the basic thing. Don't need a challenge for this,
1353 * so no need to check basic!=NULL
1354 */
1355 if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic")))
1356 return (http_basic_auth(conn,hdr,parms->user,parms->password));
1357
1358 /* Else, prefer digest. We just checked that it's not NULL */
1359 return (http_digest_auth(conn, hdr, digest, parms, url));
1360}
984263bc
MD
1361
1362/*****************************************************************************
1363 * Helper functions for connecting to a server or proxy
1364 */
1365
1366/*
1367 * Connect to the correct HTTP server or proxy.
1368 */
1369static conn_t *
30227130 1370http_connect(struct url *URL, struct url *purl, const char *flags)
984263bc
MD
1371{
1372 conn_t *conn;
1373 int verbose;
54e9236d 1374 int af, val;
984263bc
MD
1375
1376#ifdef INET6
1377 af = AF_UNSPEC;
1378#else
1379 af = AF_INET;
1380#endif
1381
1382 verbose = CHECK_FLAG('v');
1383 if (CHECK_FLAG('4'))
1384 af = AF_INET;
1385#ifdef INET6
1386 else if (CHECK_FLAG('6'))
1387 af = AF_INET6;
1388#endif
1389
1390 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) {
1391 URL = purl;
1392 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) {
1393 /* can't talk http to an ftp server */
1394 /* XXX should set an error code */
1395 return (NULL);
1396 }
1397
30227130
SW
1398 if ((conn = fetch_connect(URL->host, URL->port, af, verbose)) == NULL)
1399 /* fetch_connect() has already set an error code */
984263bc
MD
1400 return (NULL);
1401 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 &&
30227130
SW
1402 fetch_ssl(conn, verbose) == -1) {
1403 fetch_close(conn);
984263bc
MD
1404 /* grrr */
1405 errno = EAUTH;
30227130 1406 fetch_syserr();
984263bc
MD
1407 return (NULL);
1408 }
54e9236d
SW
1409
1410 val = 1;
1411 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val));
1412
984263bc
MD
1413 return (conn);
1414}
1415
1416static struct url *
30227130 1417http_get_proxy(struct url * url, const char *flags)
984263bc
MD
1418{
1419 struct url *purl;
1420 char *p;
1421
1422 if (flags != NULL && strchr(flags, 'd') != NULL)
1423 return (NULL);
30227130
SW
1424 if (fetch_no_proxy_match(url->host))
1425 return (NULL);
984263bc 1426 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
54e9236d 1427 *p && (purl = fetchParseURL(p))) {
984263bc
MD
1428 if (!*purl->scheme)
1429 strcpy(purl->scheme, SCHEME_HTTP);
1430 if (!purl->port)
30227130 1431 purl->port = fetch_default_proxy_port(purl->scheme);
984263bc
MD
1432 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
1433 return (purl);
1434 fetchFreeURL(purl);
1435 }
1436 return (NULL);
1437}
1438
1439static void
30227130 1440http_print_html(FILE *out, FILE *in)
984263bc
MD
1441{
1442 size_t len;
1443 char *line, *p, *q;
1444 int comment, tag;
1445
1446 comment = tag = 0;
1447 while ((line = fgetln(in, &len)) != NULL) {
30227130 1448 while (len && isspace((unsigned char)line[len - 1]))
984263bc
MD
1449 --len;
1450 for (p = q = line; q < line + len; ++q) {
1451 if (comment && *q == '-') {
1452 if (q + 2 < line + len &&
1453 strcmp(q, "-->") == 0) {
1454 tag = comment = 0;
1455 q += 2;
1456 }
1457 } else if (tag && !comment && *q == '>') {
1458 p = q + 1;
1459 tag = 0;
1460 } else if (!tag && *q == '<') {
1461 if (q > p)
1462 fwrite(p, q - p, 1, out);
1463 tag = 1;
1464 if (q + 3 < line + len &&
1465 strcmp(q, "<!--") == 0) {
1466 comment = 1;
1467 q += 3;
1468 }
1469 }
1470 }
1471 if (!tag && q > p)
1472 fwrite(p, q - p, 1, out);
1473 fputc('\n', out);
1474 }
1475}
1476
1477
1478/*****************************************************************************
1479 * Core
1480 */
1481
1482/*
1483 * Send a request and process the reply
1484 *
1485 * XXX This function is way too long, the do..while loop should be split
1486 * XXX off into a separate function.
1487 */
1488FILE *
30227130 1489http_request(struct url *URL, const char *op, struct url_stat *us,
5a71e1d2 1490 struct url *purl, const char *flags)
984263bc 1491{
30227130
SW
1492 char timebuf[80];
1493 char hbuf[MAXHOSTNAMELEN + 7], *host;
984263bc
MD
1494 conn_t *conn;
1495 struct url *url, *new;
5a71e1d2 1496 int chunked, direct, ims, noredirect, verbose;
54e9236d 1497 int e, i, n, val;
984263bc
MD
1498 off_t offset, clength, length, size;
1499 time_t mtime;
1500 const char *p;
1501 FILE *f;
1502 hdr_t h;
30227130 1503 struct tm *timestruct;
5a71e1d2
JM
1504 http_headerbuf_t headerbuf;
1505 http_auth_challenges_t server_challenges;
1506 http_auth_challenges_t proxy_challenges;
1507
1508 /* The following calls don't allocate anything */
1509 init_http_headerbuf(&headerbuf);
1510 init_http_auth_challenges(&server_challenges);
1511 init_http_auth_challenges(&proxy_challenges);
984263bc
MD
1512
1513 direct = CHECK_FLAG('d');
1514 noredirect = CHECK_FLAG('A');
1515 verbose = CHECK_FLAG('v');
30227130 1516 ims = CHECK_FLAG('i');
984263bc
MD
1517
1518 if (direct && purl) {
1519 fetchFreeURL(purl);
1520 purl = NULL;
1521 }
1522
1523 /* try the provided URL first */
1524 url = URL;
1525
5a71e1d2 1526 n = MAX_REDIRECT;
984263bc
MD
1527 i = 0;
1528
1529 e = HTTP_PROTOCOL_ERROR;
984263bc
MD
1530 do {
1531 new = NULL;
1532 chunked = 0;
1533 offset = 0;
1534 clength = -1;
1535 length = -1;
1536 size = -1;
1537 mtime = 0;
1538
1539 /* check port */
1540 if (!url->port)
30227130 1541 url->port = fetch_default_port(url->scheme);
984263bc
MD
1542
1543 /* were we redirected to an FTP URL? */
1544 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) {
1545 if (strcmp(op, "GET") == 0)
30227130 1546 return (ftp_request(url, "RETR", us, purl, flags));
984263bc 1547 else if (strcmp(op, "HEAD") == 0)
30227130 1548 return (ftp_request(url, "STAT", us, purl, flags));
984263bc
MD
1549 }
1550
1551 /* connect to server or proxy */
30227130 1552 if ((conn = http_connect(url, purl, flags)) == NULL)
984263bc
MD
1553 goto ouch;
1554
1555 host = url->host;
1556#ifdef INET6
1557 if (strchr(url->host, ':')) {
1558 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host);
1559 host = hbuf;
1560 }
1561#endif
30227130 1562 if (url->port != fetch_default_port(url->scheme)) {
984263bc
MD
1563 if (host != hbuf) {
1564 strcpy(hbuf, host);
1565 host = hbuf;
1566 }
1567 snprintf(hbuf + strlen(hbuf),
1568 sizeof(hbuf) - strlen(hbuf), ":%d", url->port);
1569 }
1570
1571 /* send request */
1572 if (verbose)
30227130 1573 fetch_info("requesting %s://%s%s",
984263bc
MD
1574 url->scheme, host, url->doc);
1575 if (purl) {
30227130 1576 http_cmd(conn, "%s %s://%s%s HTTP/1.1",
984263bc
MD
1577 op, url->scheme, host, url->doc);
1578 } else {
30227130 1579 http_cmd(conn, "%s %s HTTP/1.1",
984263bc
MD
1580 op, url->doc);
1581 }
1582
30227130
SW
1583 if (ims && url->ims_time) {
1584 timestruct = gmtime((time_t *)&url->ims_time);
1585 (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT",
1586 timestruct);
1587 if (verbose)
1588 fetch_info("If-Modified-Since: %s", timebuf);
1589 http_cmd(conn, "If-Modified-Since: %s", timebuf);
1590 }
984263bc 1591 /* virtual host */
30227130 1592 http_cmd(conn, "Host: %s", host);
984263bc 1593
5a71e1d2
JM
1594 /*
1595 * Proxy authorization: we only send auth after we received
1596 * a 407 error. We do not first try basic anyway (changed
1597 * when support was added for digest-auth)
1598 */
1599 if (purl && proxy_challenges.valid) {
1600 http_auth_params_t aparams;
1601 init_http_auth_params(&aparams);
1602 if (*purl->user || *purl->pwd) {
1603 aparams.user = purl->user ?
1604 strdup(purl->user) : strdup("");
1605 aparams.password = purl->pwd?
1606 strdup(purl->pwd) : strdup("");
1607 } else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL &&
1608 *p != '\0') {
1609 if (http_authfromenv(p, &aparams) < 0) {
1610 http_seterr(HTTP_NEED_PROXY_AUTH);
1611 goto ouch;
1612 }
1613 }
1614 http_authorize(conn, "Proxy-Authorization",
1615 &proxy_challenges, &aparams, url);
1616 clean_http_auth_params(&aparams);
984263bc
MD
1617 }
1618
5a71e1d2
JM
1619 /*
1620 * Server authorization: we never send "a priori"
1621 * Basic auth, which used to be done if user/pass were
1622 * set in the url. This would be weird because we'd send the
1623 * password in the clear even if Digest is finally to be
1624 * used (it would have made more sense for the
1625 * pre-digest version to do this when Basic was specified
1626 * in the environment)
1627 */
1628 if (server_challenges.valid) {
1629 http_auth_params_t aparams;
1630 init_http_auth_params(&aparams);
1631 if (*url->user || *url->pwd) {
1632 aparams.user = url->user ?
1633 strdup(url->user) : strdup("");
1634 aparams.password = url->pwd ?
1635 strdup(url->pwd) : strdup("");
1636 } else if ((p = getenv("HTTP_AUTH")) != NULL &&
1637 *p != '\0') {
1638 if (http_authfromenv(p, &aparams) < 0) {
1639 http_seterr(HTTP_NEED_AUTH);
1640 goto ouch;
1641 }
1642 } else if (fetchAuthMethod &&
1643 fetchAuthMethod(url) == 0) {
1644 aparams.user = url->user ?
1645 strdup(url->user) : strdup("");
1646 aparams.password = url->pwd ?
1647 strdup(url->pwd) : strdup("");
984263bc 1648 } else {
30227130 1649 http_seterr(HTTP_NEED_AUTH);
984263bc
MD
1650 goto ouch;
1651 }
5a71e1d2
JM
1652 http_authorize(conn, "Authorization",
1653 &server_challenges, &aparams, url);
1654 clean_http_auth_params(&aparams);
984263bc
MD
1655 }
1656
1657 /* other headers */
1658 if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') {
1659 if (strcasecmp(p, "auto") == 0)
30227130 1660 http_cmd(conn, "Referer: %s://%s%s",
984263bc
MD
1661 url->scheme, host, url->doc);
1662 else
30227130 1663 http_cmd(conn, "Referer: %s", p);
984263bc
MD
1664 }
1665 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0')
30227130 1666 http_cmd(conn, "User-Agent: %s", p);
984263bc 1667 else
30227130 1668 http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname());
984263bc 1669 if (url->offset > 0)
30227130
SW
1670 http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset);
1671 http_cmd(conn, "Connection: close");
b58f1e66 1672 http_cmd(conn, "%s", "");
984263bc 1673
54e9236d
SW
1674 /*
1675 * Force the queued request to be dispatched. Normally, one
1676 * would do this with shutdown(2) but squid proxies can be
1677 * configured to disallow such half-closed connections. To
1678 * be compatible with such configurations, fiddle with socket
1679 * options to force the pending data to be written.
1680 */
1681 val = 0;
1682 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val,
1683 sizeof(val));
1684 val = 1;
1685 setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val,
1686 sizeof(val));
1687
984263bc 1688 /* get reply */
30227130 1689 switch (http_get_reply(conn)) {
984263bc
MD
1690 case HTTP_OK:
1691 case HTTP_PARTIAL:
30227130 1692 case HTTP_NOT_MODIFIED:
984263bc
MD
1693 /* fine */
1694 break;
1695 case HTTP_MOVED_PERM:
1696 case HTTP_MOVED_TEMP:
1697 case HTTP_SEE_OTHER:
5a71e1d2 1698 case HTTP_USE_PROXY:
984263bc 1699 /*
54e9236d
SW
1700 * Not so fine, but we still have to read the
1701 * headers to get the new location.
984263bc
MD
1702 */
1703 break;
1704 case HTTP_NEED_AUTH:
5a71e1d2 1705 if (server_challenges.valid) {
984263bc 1706 /*
54e9236d
SW
1707 * We already sent out authorization code,
1708 * so there's nothing more we can do.
984263bc 1709 */
30227130 1710 http_seterr(conn->err);
984263bc
MD
1711 goto ouch;
1712 }
1713 /* try again, but send the password this time */
1714 if (verbose)
30227130 1715 fetch_info("server requires authorization");
984263bc
MD
1716 break;
1717 case HTTP_NEED_PROXY_AUTH:
5a71e1d2
JM
1718 if (proxy_challenges.valid) {
1719 /*
1720 * We already sent our proxy
1721 * authorization code, so there's
1722 * nothing more we can do. */
1723 http_seterr(conn->err);
1724 goto ouch;
1725 }
1726 /* try again, but send the password this time */
1727 if (verbose)
1728 fetch_info("proxy requires authorization");
1729 break;
54e9236d
SW
1730 case HTTP_BAD_RANGE:
1731 /*
1732 * This can happen if we ask for 0 bytes because
1733 * we already have the whole file. Consider this
1734 * a success for now, and check sizes later.
1735 */
1736 break;
984263bc
MD
1737 case HTTP_PROTOCOL_ERROR:
1738 /* fall through */
1739 case -1:
30227130 1740 fetch_syserr();
984263bc
MD
1741 goto ouch;
1742 default:
30227130 1743 http_seterr(conn->err);
984263bc
MD
1744 if (!verbose)
1745 goto ouch;
1746 /* fall through so we can get the full error message */
1747 }
1748
5a71e1d2
JM
1749 /* get headers. http_next_header expects one line readahead */
1750 if (fetch_getln(conn) == -1) {
1751 fetch_syserr();
1752 goto ouch;
1753 }
984263bc 1754 do {
5a71e1d2 1755 switch ((h = http_next_header(conn, &headerbuf, &p))) {
984263bc 1756 case hdr_syserror:
30227130 1757 fetch_syserr();
984263bc
MD
1758 goto ouch;
1759 case hdr_error:
30227130 1760 http_seterr(HTTP_PROTOCOL_ERROR);
984263bc
MD
1761 goto ouch;
1762 case hdr_content_length:
30227130 1763 http_parse_length(p, &clength);
984263bc
MD
1764 break;
1765 case hdr_content_range:
30227130 1766 http_parse_range(p, &offset, &length, &size);
984263bc
MD
1767 break;
1768 case hdr_last_modified:
30227130 1769 http_parse_mtime(p, &mtime);
984263bc
MD
1770 break;
1771 case hdr_location:
1772 if (!HTTP_REDIRECT(conn->err))
1773 break;
5a71e1d2
JM
1774 /*
1775 * if the A flag is set, we don't follow
1776 * temporary redirects.
1777 */
1778 if (noredirect &&
1779 conn->err != HTTP_MOVED_PERM &&
1780 conn->err != HTTP_PERM_REDIRECT &&
1781 conn->err != HTTP_USE_PROXY) {
1782 n = 1;
1783 break;
1784 }
984263bc
MD
1785 if (new)
1786 free(new);
1787 if (verbose)
30227130 1788 fetch_info("%d redirect to %s", conn->err, p);
984263bc
MD
1789 if (*p == '/')
1790 /* absolute path */
1791 new = fetchMakeURL(url->scheme, url->host, url->port, p,
1792 url->user, url->pwd);
1793 else
1794 new = fetchParseURL(p);
1795 if (new == NULL) {
1796 /* XXX should set an error code */
1797 DEBUG(fprintf(stderr, "failed to parse new URL\n"));
1798 goto ouch;
1799 }
5a71e1d2
JM
1800
1801 /* Only copy credentials if the host matches */
1802 if (!strcmp(new->host, url->host) && !*new->user && !*new->pwd) {
984263bc
MD
1803 strcpy(new->user, url->user);
1804 strcpy(new->pwd, url->pwd);
1805 }
1806 new->offset = url->offset;
1807 new->length = url->length;
1808 break;
1809 case hdr_transfer_encoding:
1810 /* XXX weak test*/
1811 chunked = (strcasecmp(p, "chunked") == 0);
1812 break;
1813 case hdr_www_authenticate:
1814 if (conn->err != HTTP_NEED_AUTH)
1815 break;
5a71e1d2
JM
1816 if (http_parse_authenticate(p, &server_challenges) == 0)
1817 ++n;
1818 break;
1819 case hdr_proxy_authenticate:
1820 if (conn->err != HTTP_NEED_PROXY_AUTH)
1821 break;
1822 if (http_parse_authenticate(p, &proxy_challenges) == 0)
1823 ++n;
984263bc
MD
1824 break;
1825 case hdr_end:
1826 /* fall through */
1827 case hdr_unknown:
1828 /* ignore */
1829 break;
1830 }
1831 } while (h > hdr_end);
1832
1833 /* we need to provide authentication */
5a71e1d2
JM
1834 if (conn->err == HTTP_NEED_AUTH ||
1835 conn->err == HTTP_NEED_PROXY_AUTH) {
984263bc 1836 e = conn->err;
5a71e1d2
JM
1837 if ((conn->err == HTTP_NEED_AUTH &&
1838 !server_challenges.valid) ||
1839 (conn->err == HTTP_NEED_PROXY_AUTH &&
1840 !proxy_challenges.valid)) {
1841 /* 401/7 but no www/proxy-authenticate ?? */
1842 DEBUG(fprintf(stderr, "401/7 and no auth header\n"));
1843 goto ouch;
1844 }
30227130 1845 fetch_close(conn);
984263bc
MD
1846 conn = NULL;
1847 continue;
1848 }
1849
54e9236d
SW
1850 /* requested range not satisfiable */
1851 if (conn->err == HTTP_BAD_RANGE) {
1852 if (url->offset == size && url->length == 0) {
1853 /* asked for 0 bytes; fake it */
1854 offset = url->offset;
30227130 1855 clength = -1;
54e9236d
SW
1856 conn->err = HTTP_OK;
1857 break;
1858 } else {
30227130 1859 http_seterr(conn->err);
54e9236d
SW
1860 goto ouch;
1861 }
1862 }
1863
984263bc 1864 /* we have a hit or an error */
30227130
SW
1865 if (conn->err == HTTP_OK
1866 || conn->err == HTTP_NOT_MODIFIED
1867 || conn->err == HTTP_PARTIAL
1868 || HTTP_ERROR(conn->err))
984263bc
MD
1869 break;
1870
1871 /* all other cases: we got a redirect */
1872 e = conn->err;
5a71e1d2 1873 clean_http_auth_challenges(&server_challenges);
30227130 1874 fetch_close(conn);
984263bc
MD
1875 conn = NULL;
1876 if (!new) {
1877 DEBUG(fprintf(stderr, "redirect with no new location\n"));
1878 break;
1879 }
1880 if (url != URL)
1881 fetchFreeURL(url);
1882 url = new;
1883 } while (++i < n);
1884
1885 /* we failed, or ran out of retries */
1886 if (conn == NULL) {
30227130 1887 http_seterr(e);
984263bc
MD
1888 goto ouch;
1889 }
1890
1891 DEBUG(fprintf(stderr, "offset %lld, length %lld,"
1892 " size %lld, clength %lld\n",
1893 (long long)offset, (long long)length,
1894 (long long)size, (long long)clength));
1895
30227130
SW
1896 if (conn->err == HTTP_NOT_MODIFIED) {
1897 http_seterr(HTTP_NOT_MODIFIED);
1898 return (NULL);
1899 }
1900
984263bc
MD
1901 /* check for inconsistencies */
1902 if (clength != -1 && length != -1 && clength != length) {
30227130 1903 http_seterr(HTTP_PROTOCOL_ERROR);
984263bc
MD
1904 goto ouch;
1905 }
1906 if (clength == -1)
1907 clength = length;
1908 if (clength != -1)
1909 length = offset + clength;
1910 if (length != -1 && size != -1 && length != size) {
30227130 1911 http_seterr(HTTP_PROTOCOL_ERROR);
984263bc
MD
1912 goto ouch;
1913 }
1914 if (size == -1)
1915 size = length;
1916
1917 /* fill in stats */
1918 if (us) {
1919 us->size = size;
1920 us->atime = us->mtime = mtime;
1921 }
1922
1923 /* too far? */
1924 if (URL->offset > 0 && offset > URL->offset) {
30227130 1925 http_seterr(HTTP_PROTOCOL_ERROR);
984263bc
MD
1926 goto ouch;
1927 }
1928
1929 /* report back real offset and size */
1930 URL->offset = offset;
1931 URL->length = clength;
1932
1933 /* wrap it up in a FILE */
30227130
SW
1934 if ((f = http_funopen(conn, chunked)) == NULL) {
1935 fetch_syserr();
984263bc
MD
1936 goto ouch;
1937 }
1938
1939 if (url != URL)
1940 fetchFreeURL(url);
1941 if (purl)
1942 fetchFreeURL(purl);
1943
1944 if (HTTP_ERROR(conn->err)) {
30227130 1945 http_print_html(stderr, f);
984263bc
MD
1946 fclose(f);
1947 f = NULL;
1948 }
5a71e1d2
JM
1949 clean_http_headerbuf(&headerbuf);
1950 clean_http_auth_challenges(&server_challenges);
1951 clean_http_auth_challenges(&proxy_challenges);
984263bc
MD
1952 return (f);
1953
1954ouch:
1955 if (url != URL)
1956 fetchFreeURL(url);
1957 if (purl)
1958 fetchFreeURL(purl);
1959 if (conn != NULL)
30227130 1960 fetch_close(conn);
5a71e1d2
JM
1961 clean_http_headerbuf(&headerbuf);
1962 clean_http_auth_challenges(&server_challenges);
1963 clean_http_auth_challenges(&proxy_challenges);
984263bc
MD
1964 return (NULL);
1965}
1966
1967
1968/*****************************************************************************
1969 * Entry points
1970 */
1971
1972/*
1973 * Retrieve and stat a file by HTTP
1974 */
1975FILE *
1976fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags)
1977{
30227130 1978 return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags));
984263bc
MD
1979}
1980
1981/*
1982 * Retrieve a file by HTTP
1983 */
1984FILE *
1985fetchGetHTTP(struct url *URL, const char *flags)
1986{
1987 return (fetchXGetHTTP(URL, NULL, flags));
1988}
1989
1990/*
1991 * Store a file by HTTP
1992 */
1993FILE *
1994fetchPutHTTP(struct url *URL __unused, const char *flags __unused)
1995{
1996 warnx("fetchPutHTTP(): not implemented");
1997 return (NULL);
1998}
1999
2000/*
2001 * Get an HTTP document's metadata
2002 */
2003int
2004fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags)
2005{
2006 FILE *f;
2007
30227130 2008 f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags);
984263bc
MD
2009 if (f == NULL)
2010 return (-1);
2011 fclose(f);
2012 return (0);
2013}
2014
2015/*
2016 * List a directory
2017 */
2018struct url_ent *
2019fetchListHTTP(struct url *url __unused, const char *flags __unused)
2020{
2021 warnx("fetchListHTTP(): not implemented");
2022 return (NULL);
2023}