1/*-
2 * Copyright (c) 2000 Dag-Erling Co�dan Sm�rgrav
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 * $FreeBSD: head/lib/libfetch/http.c 75891 2001-04-24 00:06:21Z archie $
|
| 28 * $FreeBSD: head/lib/libfetch/http.c 77238 2001-05-26 19:37:15Z des $ |
29 */
30
31/*
32 * The following copyright applies to the base64 code:
33 *
34 *-
35 * Copyright 1997 Massachusetts Institute of Technology
36 *
37 * Permission to use, copy, modify, and distribute this software and
38 * its documentation for any purpose and without fee is hereby
39 * granted, provided that both the above copyright notice and this
40 * permission notice appear in all copies, that both the above
41 * copyright notice and this permission notice appear in all
42 * supporting documentation, and that the name of M.I.T. not be used
43 * in advertising or publicity pertaining to distribution of the
44 * software without specific, written prior permission. M.I.T. makes
45 * no representations about the suitability of this software for any
46 * purpose. It is provided "as is" without express or implied
47 * warranty.
48 *
49 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
50 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
51 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
52 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
53 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
54 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
55 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
56 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
57 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
58 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
59 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63#include <sys/param.h>
64#include <sys/socket.h>
65
66#include <ctype.h>
67#include <err.h>
68#include <errno.h>
69#include <locale.h>
70#include <netdb.h>
71#include <stdarg.h>
72#include <stdio.h>
73#include <stdlib.h>
74#include <string.h>
75#include <time.h>
76#include <unistd.h>
77
78#include "fetch.h"
79#include "common.h"
80#include "httperr.h"
81
82extern char *__progname; /* XXX not portable */
83
84/* Maximum number of redirects to follow */
85#define MAX_REDIRECT 5
86
87/* Symbolic names for reply codes we care about */
88#define HTTP_OK 200
89#define HTTP_PARTIAL 206
90#define HTTP_MOVED_PERM 301
91#define HTTP_MOVED_TEMP 302
92#define HTTP_SEE_OTHER 303
93#define HTTP_NEED_AUTH 401
94#define HTTP_NEED_PROXY_AUTH 403
95#define HTTP_PROTOCOL_ERROR 999
96
97#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
98 || (xyz) == HTTP_MOVED_TEMP \
99 || (xyz) == HTTP_SEE_OTHER)
100
101
102
103/*****************************************************************************
104 * I/O functions for decoding chunked streams
105 */
106
107struct cookie
108{
109 int fd;
110 char *buf;
111 size_t b_size;
112 size_t b_len;
113 int b_pos;
114 int eof;
115 int error;
116 long chunksize;
117#ifndef NDEBUG
118 long total;
119#endif
120};
121
122/*
123 * Get next chunk header
124 */
125static int
126_http_new_chunk(struct cookie *c)
127{
128 char *p;
129
130 if (_fetch_getln(c->fd, &c->buf, &c->b_size, &c->b_len) == -1)
131 return -1;
132
133 if (c->b_len < 2 || !ishexnumber(*c->buf))
134 return -1;
135
136 for (p = c->buf; !isspace(*p) && *p != ';' && p < c->buf + c->b_len; ++p)
137 if (!ishexnumber(*p))
138 return -1;
139 else if (isdigit(*p))
140 c->chunksize = c->chunksize * 16 + *p - '0';
141 else
142 c->chunksize = c->chunksize * 16 + 10 + tolower(*p) - 'a';
143
144#ifndef NDEBUG
145 c->total += c->chunksize;
146 if (c->chunksize == 0)
147 fprintf(stderr, "\033[1m_http_fillbuf(): "
148 "end of last chunk\033[m\n");
149 else
150 fprintf(stderr, "\033[1m_http_fillbuf(): "
151 "new chunk: %ld (%ld)\033[m\n", c->chunksize, c->total);
152#endif
153
154 return c->chunksize;
155}
156
157/*
158 * Fill the input buffer, do chunk decoding on the fly
159 */
160static int
161_http_fillbuf(struct cookie *c)
162{
163 if (c->error)
164 return -1;
165 if (c->eof)
166 return 0;
167
168 if (c->chunksize == 0) {
169 switch (_http_new_chunk(c)) {
170 case -1:
171 c->error = 1;
172 return -1;
173 case 0:
174 c->eof = 1;
175 return 0;
176 }
177 }
178
179 if (c->b_size < c->chunksize) {
180 char *tmp;
181
182 if ((tmp = realloc(c->buf, c->chunksize)) == NULL)
183 return -1;
184 c->buf = tmp;
185 c->b_size = c->chunksize;
186 }
187
188 if ((c->b_len = read(c->fd, c->buf, c->chunksize)) == -1)
189 return -1;
190 c->chunksize -= c->b_len;
191
192 if (c->chunksize == 0) {
193 char endl[2];
194 read(c->fd, endl, 2);
195 }
196
197 c->b_pos = 0;
198
199 return c->b_len;
200}
201
202/*
203 * Read function
204 */
205static int
206_http_readfn(void *v, char *buf, int len)
207{
208 struct cookie *c = (struct cookie *)v;
209 int l, pos;
210
211 if (c->error)
212 return -1;
213 if (c->eof)
214 return 0;
215
216 for (pos = 0; len > 0; pos += l, len -= l) {
217 /* empty buffer */
218 if (!c->buf || c->b_pos == c->b_len)
219 if (_http_fillbuf(c) < 1)
220 break;
221 l = c->b_len - c->b_pos;
222 if (len < l)
223 l = len;
224 bcopy(c->buf + c->b_pos, buf + pos, l);
225 c->b_pos += l;
226 }
227
228 if (!pos && c->error)
229 return -1;
230 return pos;
231}
232
233/*
234 * Write function
235 */
236static int
237_http_writefn(void *v, const char *buf, int len)
238{
239 struct cookie *c = (struct cookie *)v;
240
241 return write(c->fd, buf, len);
242}
243
244/*
245 * Close function
246 */
247static int
248_http_closefn(void *v)
249{
250 struct cookie *c = (struct cookie *)v;
251 int r;
252
253 r = close(c->fd);
254 if (c->buf)
255 free(c->buf);
256 free(c);
257 return r;
258}
259
260/*
261 * Wrap a file descriptor up
262 */
263static FILE *
264_http_funopen(int fd)
265{
266 struct cookie *c;
267 FILE *f;
268
269 if ((c = calloc(1, sizeof *c)) == NULL) {
270 _fetch_syserr();
271 return NULL;
272 }
273 c->fd = fd;
274 if (!(f = funopen(c, _http_readfn, _http_writefn, NULL, _http_closefn))) {
275 _fetch_syserr();
276 free(c);
277 return NULL;
278 }
279 return f;
280}
281
282
283/*****************************************************************************
284 * Helper functions for talking to the server and parsing its replies
285 */
286
287/* Header types */
288typedef enum {
289 hdr_syserror = -2,
290 hdr_error = -1,
291 hdr_end = 0,
292 hdr_unknown = 1,
293 hdr_content_length,
294 hdr_content_range,
295 hdr_last_modified,
296 hdr_location,
|
297 hdr_transfer_encoding
|
297 hdr_transfer_encoding,
298 hdr_www_authenticate |
299} hdr;
300
301/* Names of interesting headers */
302static struct {
303 hdr num;
304 const char *name;
305} hdr_names[] = {
306 { hdr_content_length, "Content-Length" },
307 { hdr_content_range, "Content-Range" },
308 { hdr_last_modified, "Last-Modified" },
309 { hdr_location, "Location" },
310 { hdr_transfer_encoding, "Transfer-Encoding" },
|
| 311 { hdr_www_authenticate, "WWW-Authenticate" }, |
312 { hdr_unknown, NULL },
313};
314
315static char *reply_buf;
316static size_t reply_size;
317static size_t reply_length;
318
319/*
320 * Send a formatted line; optionally echo to terminal
321 */
322static int
323_http_cmd(int fd, const char *fmt, ...)
324{
325 va_list ap;
326 size_t len;
327 char *msg;
328 int r;
329
330 va_start(ap, fmt);
331 len = vasprintf(&msg, fmt, ap);
332 va_end(ap);
333
334 if (msg == NULL) {
335 errno = ENOMEM;
336 _fetch_syserr();
337 return -1;
338 }
339
340 r = _fetch_putln(fd, msg, len);
341 free(msg);
342
343 if (r == -1) {
344 _fetch_syserr();
345 return -1;
346 }
347
348 return 0;
349}
350
351/*
352 * Get and parse status line
353 */
354static int
355_http_get_reply(int fd)
356{
357 char *p;
358
359 if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1)
360 return -1;
361 /*
362 * A valid status line looks like "HTTP/m.n xyz reason" where m
363 * and n are the major and minor protocol version numbers and xyz
364 * is the reply code.
365 * Unfortunately, there are servers out there (NCSA 1.5.1, to name
366 * just one) that do not send a version number, so we can't rely
367 * on finding one, but if we do, insist on it being 1.0 or 1.1.
368 * We don't care about the reason phrase.
369 */
370 if (strncmp(reply_buf, "HTTP", 4) != 0)
371 return HTTP_PROTOCOL_ERROR;
372 p = reply_buf + 4;
373 if (*p == '/') {
374 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1'))
375 return HTTP_PROTOCOL_ERROR;
376 p += 4;
377 }
378 if (*p != ' '
379 || !isdigit(p[1])
380 || !isdigit(p[2])
381 || !isdigit(p[3]))
382 return HTTP_PROTOCOL_ERROR;
383
384 return ((p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'));
385}
386
387/*
388 * Check a header; if the type matches the given string, return a
389 * pointer to the beginning of the value.
390 */
391static const char *
392_http_match(const char *str, const char *hdr)
393{
394 while (*str && *hdr && tolower(*str++) == tolower(*hdr++))
395 /* nothing */;
396 if (*str || *hdr != ':')
397 return NULL;
398 while (*hdr && isspace(*++hdr))
399 /* nothing */;
400 return hdr;
401}
402
403/*
404 * Get the next header and return the appropriate symbolic code.
405 */
406static hdr
407_http_next_header(int fd, const char **p)
408{
409 int i;
410
411 if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1)
412 return hdr_syserror;
413 while (reply_length && isspace(reply_buf[reply_length-1]))
414 reply_length--;
415 reply_buf[reply_length] = 0;
416 if (reply_length == 0)
417 return hdr_end;
418 /*
419 * We could check for malformed headers but we don't really care.
420 * A valid header starts with a token immediately followed by a
421 * colon; a token is any sequence of non-control, non-whitespace
422 * characters except "()<>@,;:\\\"{}".
423 */
424 for (i = 0; hdr_names[i].num != hdr_unknown; i++)
425 if ((*p = _http_match(hdr_names[i].name, reply_buf)) != NULL)
426 return hdr_names[i].num;
427 return hdr_unknown;
428}
429
430/*
431 * Parse a last-modified header
432 */
433static int
434_http_parse_mtime(const char *p, time_t *mtime)
435{
436 char locale[64], *r;
437 struct tm tm;
438
439 strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale);
440 setlocale(LC_TIME, "C");
441 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
442 /* XXX should add support for date-2 and date-3 */
443 setlocale(LC_TIME, locale);
444 if (r == NULL)
445 return -1;
446 DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
447 "%02d:%02d:%02d\033[m]\n",
448 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
449 tm.tm_hour, tm.tm_min, tm.tm_sec));
450 *mtime = timegm(&tm);
451 return 0;
452}
453
454/*
455 * Parse a content-length header
456 */
457static int
458_http_parse_length(const char *p, off_t *length)
459{
460 off_t len;
461
462 for (len = 0; *p && isdigit(*p); ++p)
463 len = len * 10 + (*p - '0');
464 DEBUG(fprintf(stderr, "content length: [\033[1m%lld\033[m]\n", len));
465 *length = len;
466 return 0;
467}
468
469/*
470 * Parse a content-range header
471 */
472static int
473_http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size)
474{
475 int first, last, len;
476
477 if (strncasecmp(p, "bytes ", 6) != 0)
478 return -1;
479 for (first = 0, p += 6; *p && isdigit(*p); ++p)
480 first = first * 10 + *p - '0';
481 if (*p != '-')
482 return -1;
483 for (last = 0, ++p; *p && isdigit(*p); ++p)
484 last = last * 10 + *p - '0';
485 if (first > last || *p != '/')
486 return -1;
487 for (len = 0, ++p; *p && isdigit(*p); ++p)
488 len = len * 10 + *p - '0';
489 if (len < last - first + 1)
490 return -1;
491 DEBUG(fprintf(stderr, "content range: [\033[1m%d-%d/%d\033[m]\n",
492 first, last, len));
493 *offset = first;
494 *length = last - first + 1;
495 *size = len;
496 return 0;
497}
498
499
500/*****************************************************************************
501 * Helper functions for authorization
502 */
503
504/*
505 * Base64 encoding
506 */
507static char *
508_http_base64(char *src)
509{
510 static const char base64[] =
511 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
512 "abcdefghijklmnopqrstuvwxyz"
513 "0123456789+/";
514 char *str, *dst;
515 size_t l;
516 int t, r;
517
518 l = strlen(src);
519 if ((str = malloc(((l + 2) / 3) * 4)) == NULL)
520 return NULL;
521 dst = str;
522 r = 0;
523
524 while (l >= 3) {
525 t = (src[0] << 16) | (src[1] << 8) | src[2];
526 dst[0] = base64[(t >> 18) & 0x3f];
527 dst[1] = base64[(t >> 12) & 0x3f];
528 dst[2] = base64[(t >> 6) & 0x3f];
529 dst[3] = base64[(t >> 0) & 0x3f];
530 src += 3; l -= 3;
531 dst += 4; r += 4;
532 }
533
534 switch (l) {
535 case 2:
536 t = (src[0] << 16) | (src[1] << 8);
537 dst[0] = base64[(t >> 18) & 0x3f];
538 dst[1] = base64[(t >> 12) & 0x3f];
539 dst[2] = base64[(t >> 6) & 0x3f];
540 dst[3] = '=';
541 dst += 4;
542 r += 4;
543 break;
544 case 1:
545 t = src[0] << 16;
546 dst[0] = base64[(t >> 18) & 0x3f];
547 dst[1] = base64[(t >> 12) & 0x3f];
548 dst[2] = dst[3] = '=';
549 dst += 4;
550 r += 4;
551 break;
552 case 0:
553 break;
554 }
555
556 *dst = 0;
557 return str;
558}
559
560/*
561 * Encode username and password
562 */
563static int
564_http_basic_auth(int fd, const char *hdr, const char *usr, const char *pwd)
565{
566 char *upw, *auth;
567 int r;
568
|
569 DEBUG(fprintf(stderr, "usr: [\033[1m%s\033[m]\n", usr));
570 DEBUG(fprintf(stderr, "pwd: [\033[1m%s\033[m]\n", pwd)); |
571 if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
572 return -1;
573 auth = _http_base64(upw);
574 free(upw);
575 if (auth == NULL)
576 return -1;
577 r = _http_cmd(fd, "%s: Basic %s", hdr, auth);
578 free(auth);
579 return r;
580}
581
582/*
583 * Send an authorization header
584 */
585static int
586_http_authorize(int fd, const char *hdr, const char *p)
587{
588 /* basic authorization */
589 if (strncasecmp(p, "basic:", 6) == 0) {
590 char *user, *pwd, *str;
591 int r;
592
593 /* skip realm */
594 for (p += 6; *p && *p != ':'; ++p)
595 /* nothing */ ;
596 if (!*p || strchr(++p, ':') == NULL)
597 return -1;
598 if ((str = strdup(p)) == NULL)
599 return -1; /* XXX */
600 user = str;
601 pwd = strchr(str, ':');
602 *pwd++ = '\0';
603 r = _http_basic_auth(fd, hdr, user, pwd);
604 free(str);
605 return r;
606 }
607 return -1;
608}
609
610
611/*****************************************************************************
612 * Helper functions for connecting to a server or proxy
613 */
614
615/*
616 * Connect to the correct HTTP server or proxy.
617 */
618static int
619_http_connect(struct url *URL, struct url *purl, const char *flags)
620{
621 int verbose;
622 int af, fd;
623
624#ifdef INET6
625 af = AF_UNSPEC;
626#else
627 af = AF_INET;
628#endif
629
630 verbose = CHECK_FLAG('v');
631 if (CHECK_FLAG('4'))
632 af = AF_INET;
633#ifdef INET6
634 else if (CHECK_FLAG('6'))
635 af = AF_INET6;
636#endif
637
638 if (purl) {
639 URL = purl;
640 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) {
641 /* can't talk http to an ftp server */
642 /* XXX should set an error code */
643 return -1;
644 }
645
646 if ((fd = _fetch_connect(URL->host, URL->port, af, verbose)) == -1)
647 /* _fetch_connect() has already set an error code */
648 return -1;
649 return fd;
650}
651
652static struct url *
653_http_get_proxy(void)
654{
655 struct url *purl;
656 char *p;
657
658 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
659 (purl = fetchParseURL(p))) {
660 if (!*purl->scheme)
661 strcpy(purl->scheme, SCHEME_HTTP);
662 if (!purl->port)
663 purl->port = _fetch_default_proxy_port(purl->scheme);
664 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
665 return purl;
666 fetchFreeURL(purl);
667 }
668 return NULL;
669}
670
671
672/*****************************************************************************
673 * Core
674 */
675
676/*
677 * Send a request and process the reply
678 */
679FILE *
680_http_request(struct url *URL, const char *op, struct url_stat *us,
681 struct url *purl, const char *flags)
682{
683 struct url *url, *new;
684 int chunked, direct, need_auth, noredirect, verbose;
685 int code, fd, i, n;
686 off_t offset, clength, length, size;
687 time_t mtime;
688 const char *p;
689 FILE *f;
690 hdr h;
691 char *host;
692#ifdef INET6
693 char hbuf[MAXHOSTNAMELEN + 1];
694#endif
695
696 direct = CHECK_FLAG('d');
697 noredirect = CHECK_FLAG('A');
698 verbose = CHECK_FLAG('v');
699
700 if (direct && purl) {
701 fetchFreeURL(purl);
702 purl = NULL;
703 }
704
705 /* try the provided URL first */
706 url = URL;
707
708 /* if the A flag is set, we only get one try */
709 n = noredirect ? 1 : MAX_REDIRECT;
710 i = 0;
711
|
| 712 need_auth = 0; |
713 do {
714 new = NULL;
715 chunked = 0;
|
711 need_auth = 0;
|
716 offset = 0;
717 clength = -1;
718 length = -1;
719 size = -1;
720 mtime = 0;
|
717 retry:
|
| 721 |
722 /* check port */
723 if (!url->port)
724 url->port = _fetch_default_port(url->scheme);
725
726 /* connect to server or proxy */
727 if ((fd = _http_connect(url, purl, flags)) == -1)
728 goto ouch;
729
730 host = url->host;
731#ifdef INET6
732 if (strchr(url->host, ':')) {
733 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host);
734 host = hbuf;
735 }
736#endif
737
738 /* send request */
739 if (verbose)
740 _fetch_info("requesting %s://%s:%d%s",
741 url->scheme, host, url->port, url->doc);
742 if (purl) {
743 _http_cmd(fd, "%s %s://%s:%d%s HTTP/1.1",
744 op, url->scheme, host, url->port, url->doc);
745 } else {
746 _http_cmd(fd, "%s %s HTTP/1.1",
747 op, url->doc);
748 }
749
|
750 /* virtual host */
751 if (url->port == _fetch_default_port(url->scheme))
752 _http_cmd(fd, "Host: %s", host);
753 else
754 _http_cmd(fd, "Host: %s:%d", host, url->port);
755 |
756 /* proxy authorization */
757 if (purl) {
758 if (*purl->user || *purl->pwd)
759 _http_basic_auth(fd, "Proxy-Authorization",
760 purl->user, purl->pwd);
761 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0')
762 _http_authorize(fd, "Proxy-Authorization", p);
763 }
764
765 /* server authorization */
|
756 if (need_auth) {
|
| 766 if (need_auth || *url->user || *url->pwd) { |
767 if (*url->user || *url->pwd)
768 _http_basic_auth(fd, "Authorization", url->user, url->pwd);
769 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0')
770 _http_authorize(fd, "Authorization", p);
|
761 else {
|
771 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) {
772 _http_basic_auth(fd, "Authorization", url->user, url->pwd);
773 } else { |
774 _http_seterr(HTTP_NEED_AUTH);
775 goto ouch;
776 }
777 }
778
779 /* other headers */
|
768 if (url->port == _fetch_default_port(url->scheme))
769 _http_cmd(fd, "Host: %s", host);
770 else
771 _http_cmd(fd, "Host: %s:%d", host, url->port);
|
780 _http_cmd(fd, "User-Agent: %s " _LIBFETCH_VER, __progname);
781 if (url->offset)
782 _http_cmd(fd, "Range: bytes=%lld-", url->offset);
783 _http_cmd(fd, "Connection: close");
784 _http_cmd(fd, "");
785
786 /* get reply */
787 switch ((code = _http_get_reply(fd))) {
788 case HTTP_OK:
789 case HTTP_PARTIAL:
790 /* fine */
791 break;
792 case HTTP_MOVED_PERM:
793 case HTTP_MOVED_TEMP:
794 /*
795 * Not so fine, but we still have to read the headers to
796 * get the new location.
797 */
798 break;
799 case HTTP_NEED_AUTH:
800 if (need_auth) {
801 /*
802 * We already sent out authorization code, so there's
803 * nothing more we can do.
804 */
805 _http_seterr(code);
806 goto ouch;
807 }
808 /* try again, but send the password this time */
809 if (verbose)
810 _fetch_info("server requires authorization");
|
803 need_auth = 1;
804 close(fd);
805 goto retry;
|
| 811 break; |
812 case HTTP_NEED_PROXY_AUTH:
813 /*
814 * If we're talking to a proxy, we already sent our proxy
815 * authorization code, so there's nothing more we can do.
816 */
817 _http_seterr(code);
818 goto ouch;
819 case HTTP_PROTOCOL_ERROR:
820 /* fall through */
821 case -1:
822 _fetch_syserr();
823 goto ouch;
824 default:
825 _http_seterr(code);
826 goto ouch;
827 }
828
829 /* get headers */
830 do {
831 switch ((h = _http_next_header(fd, &p))) {
832 case hdr_syserror:
833 _fetch_syserr();
834 goto ouch;
835 case hdr_error:
836 _http_seterr(HTTP_PROTOCOL_ERROR);
837 goto ouch;
838 case hdr_content_length:
839 _http_parse_length(p, &clength);
840 break;
841 case hdr_content_range:
842 _http_parse_range(p, &offset, &length, &size);
843 break;
844 case hdr_last_modified:
845 _http_parse_mtime(p, &mtime);
846 break;
847 case hdr_location:
848 if (!HTTP_REDIRECT(code))
849 break;
850 if (new)
851 free(new);
852 if (verbose)
853 _fetch_info("%d redirect to %s", code, p);
854 if (*p == '/')
855 /* absolute path */
856 new = fetchMakeURL(url->scheme, url->host, url->port, p,
857 url->user, url->pwd);
858 else
859 new = fetchParseURL(p);
860 if (new == NULL) {
861 /* XXX should set an error code */
862 DEBUG(fprintf(stderr, "failed to parse new URL\n"));
863 goto ouch;
864 }
865 if (!*new->user && !*new->pwd) {
866 strcpy(new->user, url->user);
867 strcpy(new->pwd, url->pwd);
868 }
869 new->offset = url->offset;
870 new->length = url->length;
871 break;
872 case hdr_transfer_encoding:
873 /* XXX weak test*/
874 chunked = (strcasecmp(p, "chunked") == 0);
875 break;
|
876 case hdr_www_authenticate:
877 if (code != HTTP_NEED_AUTH)
878 break;
879 /* if we were smarter, we'd check the method and realm */
880 break; |
881 case hdr_end:
882 /* fall through */
883 case hdr_unknown:
884 /* ignore */
885 break;
886 }
887 } while (h > hdr_end);
888
|
878 /* we either have a hit, or a redirect with no Location: header */
879 if (code == HTTP_OK || code == HTTP_PARTIAL || !new)
|
889 /* we have a hit */
890 if (code == HTTP_OK || code == HTTP_PARTIAL) |
891 break;
892
|
882 /* we have a redirect */
|
893 /* we need to provide authentication */
894 if (code == HTTP_NEED_AUTH) {
895 need_auth = 1;
896 close(fd);
897 fd = -1;
898 continue;
899 }
900
901 /* all other cases: we got a redirect */
902 need_auth = 0; |
903 close(fd);
904 fd = -1;
|
905 if (!new) {
906 DEBUG(fprintf(stderr, "redirect with no new location\n"));
907 break;
908 } |
909 if (url != URL)
910 fetchFreeURL(url);
911 url = new;
912 } while (++i < n);
913
|
890 /* no success */
|
| 914 /* we failed, or ran out of retries */ |
915 if (fd == -1) {
916 _http_seterr(code);
917 goto ouch;
918 }
919
920 DEBUG(fprintf(stderr, "offset %lld, length %lld, size %lld, clength %lld\n",
921 offset, length, size, clength));
922
923 /* check for inconsistencies */
924 if (clength != -1 && length != -1 && clength != length) {
925 _http_seterr(HTTP_PROTOCOL_ERROR);
926 goto ouch;
927 }
928 if (clength == -1)
929 clength = length;
930 if (clength != -1)
931 length = offset + clength;
932 if (length != -1 && size != -1 && length != size) {
933 _http_seterr(HTTP_PROTOCOL_ERROR);
934 goto ouch;
935 }
936 if (size == -1)
937 size = length;
938
939 /* fill in stats */
940 if (us) {
941 us->size = size;
942 us->atime = us->mtime = mtime;
943 }
944
945 /* too far? */
946 if (offset > URL->offset) {
947 _http_seterr(HTTP_PROTOCOL_ERROR);
948 goto ouch;
949 }
950
951 /* report back real offset and size */
952 URL->offset = offset;
953 URL->length = clength;
954
955 /* wrap it up in a FILE */
956 if ((f = chunked ? _http_funopen(fd) : fdopen(fd, "r")) == NULL) {
957 _fetch_syserr();
958 goto ouch;
959 }
960
961 if (url != URL)
962 fetchFreeURL(url);
963 if (purl)
964 fetchFreeURL(purl);
965
966 return f;
967
968 ouch:
969 if (url != URL)
970 fetchFreeURL(url);
971 if (purl)
972 fetchFreeURL(purl);
973 if (fd != -1)
974 close(fd);
975 return NULL;
976}
977
978
979/*****************************************************************************
980 * Entry points
981 */
982
983/*
984 * Retrieve and stat a file by HTTP
985 */
986FILE *
987fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags)
988{
989 return _http_request(URL, "GET", us, _http_get_proxy(), flags);
990}
991
992/*
993 * Retrieve a file by HTTP
994 */
995FILE *
996fetchGetHTTP(struct url *URL, const char *flags)
997{
998 return fetchXGetHTTP(URL, NULL, flags);
999}
1000
1001/*
1002 * Store a file by HTTP
1003 */
1004FILE *
1005fetchPutHTTP(struct url *URL, const char *flags)
1006{
1007 warnx("fetchPutHTTP(): not implemented");
1008 return NULL;
1009}
1010
1011/*
1012 * Get an HTTP document's metadata
1013 */
1014int
1015fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags)
1016{
1017 FILE *f;
1018
1019 if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL)
1020 return -1;
1021 fclose(f);
1022 return 0;
1023}
1024
1025/*
1026 * List a directory
1027 */
1028struct url_ent *
1029fetchListHTTP(struct url *url, const char *flags)
1030{
1031 warnx("fetchListHTTP(): not implemented");
1032 return NULL;
1033}
|