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
67#include <ctype.h>
68#include <err.h>
69#include <errno.h>
70#include <locale.h>
71#include <netdb.h>
72#include <stdarg.h>
73#include <stdio.h>
74#include <stdlib.h>
75#include <string.h>
76#include <time.h>
77#include <unistd.h>
78
79#include "fetch.h"
80#include "common.h"
81#include "httperr.h"
82
83/* Maximum number of redirects to follow */
84#define MAX_REDIRECT 5
85
86/* Symbolic names for reply codes we care about */
87#define HTTP_OK 200
88#define HTTP_PARTIAL 206
89#define HTTP_MOVED_PERM 301
90#define HTTP_MOVED_TEMP 302
91#define HTTP_SEE_OTHER 303
92#define HTTP_NEED_AUTH 401
93#define HTTP_NEED_PROXY_AUTH 407
94#define HTTP_PROTOCOL_ERROR 999
95
96#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
97 || (xyz) == HTTP_MOVED_TEMP \
98 || (xyz) == HTTP_SEE_OTHER)
99
100#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599)
101
102
103/*****************************************************************************
104 * I/O functions for decoding chunked streams
105 */
106
107struct httpio
108{
109 conn_t *conn; /* connection */
110 int chunked; /* chunked mode */
111 char *buf; /* chunk buffer */
112 size_t bufsize; /* size of chunk buffer */
113 ssize_t buflen; /* amount of data currently in buffer */
114 int bufpos; /* current read offset in buffer */
115 int eof; /* end-of-file flag */
116 int error; /* error flag */
117 size_t chunksize; /* remaining size of current chunk */
118#ifndef NDEBUG
119 size_t total;
120#endif
121};
122
123/*
124 * Get next chunk header
125 */
126static int
127_http_new_chunk(struct httpio *io)
128{
129 char *p;
130
131 if (_fetch_getln(io->conn) == -1)
132 return (-1);
133
134 if (io->conn->buflen < 2 || !ishexnumber(*io->conn->buf))
135 return (-1);
136
137 for (p = io->conn->buf; *p && !isspace(*p); ++p) {
138 if (*p == ';')
139 break;
140 if (!ishexnumber(*p))
141 return (-1);
142 if (isdigit(*p)) {
143 io->chunksize = io->chunksize * 16 +
144 *p - '0';
145 } else {
146 io->chunksize = io->chunksize * 16 +
147 10 + tolower(*p) - 'a';
148 }
149 }
150
151#ifndef NDEBUG
152 if (fetchDebug) {
153 io->total += io->chunksize;
154 if (io->chunksize == 0)
155 fprintf(stderr, "_http_fillbuf(): "
156 "end of last chunk\n");
157 else
158 fprintf(stderr, "_http_fillbuf(): "
159 "new chunk: %lu (%lu)\n",
160 (unsigned long)io->chunksize, (unsigned long)io->total);
161 }
162#endif
163
164 return (io->chunksize);
165}
166
167/*
168 * Grow the input buffer to at least len bytes
169 */
170static inline int
171_http_growbuf(struct httpio *io, size_t len)
172{
173 char *tmp;
174
175 if (io->bufsize >= len)
176 return (0);
177
178 if ((tmp = realloc(io->buf, len)) == NULL)
179 return (-1);
180 io->buf = tmp;
181 io->bufsize = len;
182}
183
184/*
185 * Fill the input buffer, do chunk decoding on the fly
186 */
187static int
188_http_fillbuf(struct httpio *io, size_t len)
189{
190 if (io->error)
191 return (-1);
192 if (io->eof)
193 return (0);
194
195 if (io->chunked == 0) {
196 if (_http_growbuf(io, len) == -1)
197 return (-1);
198 if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1)
199 return (-1);
200 io->bufpos = 0;
201 return (io->buflen);
202 }
203
204 if (io->chunksize == 0) {
205 switch (_http_new_chunk(io)) {
206 case -1:
207 io->error = 1;
208 return (-1);
209 case 0:
210 io->eof = 1;
211 return (0);
212 }
213 }
214
215 if (len > io->chunksize)
216 len = io->chunksize;
217 if (_http_growbuf(io, len) == -1)
218 return (-1);
219 if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1)
220 return (-1);
221 io->chunksize -= io->buflen;
222
223 if (io->chunksize == 0) {
224 char endl[2];
225
226 if (_fetch_read(io->conn, endl, 2) != 2 ||
227 endl[0] != '\r' || endl[1] != '\n')
228 return (-1);
229 }
230
231 io->bufpos = 0;
232
233 return (io->buflen);
234}
235
236/*
237 * Read function
238 */
239static int
240_http_readfn(void *v, char *buf, int len)
241{
242 struct httpio *io = (struct httpio *)v;
243 int l, pos;
244
245 if (io->error)
246 return (-1);
247 if (io->eof)
248 return (0);
249
250 for (pos = 0; len > 0; pos += l, len -= l) {
251 /* empty buffer */
252 if (!io->buf || io->bufpos == io->buflen)
253 if (_http_fillbuf(io, len) < 1)
254 break;
255 l = io->buflen - io->bufpos;
256 if (len < l)
257 l = len;
258 bcopy(io->buf + io->bufpos, buf + pos, l);
259 io->bufpos += l;
260 }
261
262 if (!pos && io->error)
263 return (-1);
264 return (pos);
265}
266
267/*
268 * Write function
269 */
270static int
271_http_writefn(void *v, const char *buf, int len)
272{
273 struct httpio *io = (struct httpio *)v;
274
275 return (_fetch_write(io->conn, buf, len));
276}
277
278/*
279 * Close function
280 */
281static int
282_http_closefn(void *v)
283{
284 struct httpio *io = (struct httpio *)v;
285 int r;
286
287 r = _fetch_close(io->conn);
288 if (io->buf)
289 free(io->buf);
290 free(io);
291 return (r);
292}
293
294/*
295 * Wrap a file descriptor up
296 */
297static FILE *
298_http_funopen(conn_t *conn, int chunked)
299{
300 struct httpio *io;
301 FILE *f;
302
303 if ((io = calloc(1, sizeof *io)) == NULL) {
304 _fetch_syserr();
305 return (NULL);
306 }
307 io->conn = conn;
308 io->chunked = chunked;
309 f = funopen(io, _http_readfn, _http_writefn, NULL, _http_closefn);
310 if (f == NULL) {
311 _fetch_syserr();
312 free(io);
313 return (NULL);
314 }
315 return (f);
316}
317
318
319/*****************************************************************************
320 * Helper functions for talking to the server and parsing its replies
321 */
322
323/* Header types */
324typedef enum {
325 hdr_syserror = -2,
326 hdr_error = -1,
327 hdr_end = 0,
328 hdr_unknown = 1,
329 hdr_content_length,
330 hdr_content_range,
331 hdr_last_modified,
332 hdr_location,
333 hdr_transfer_encoding,
334 hdr_www_authenticate
335} hdr_t;
336
337/* Names of interesting headers */
338static struct {
339 hdr_t num;
340 const char *name;
341} hdr_names[] = {
342 { hdr_content_length, "Content-Length" },
343 { hdr_content_range, "Content-Range" },
344 { hdr_last_modified, "Last-Modified" },
345 { hdr_location, "Location" },
346 { hdr_transfer_encoding, "Transfer-Encoding" },
347 { hdr_www_authenticate, "WWW-Authenticate" },
348 { hdr_unknown, NULL },
349};
350
351/*
352 * Send a formatted line; optionally echo to terminal
353 */
354static int
355_http_cmd(conn_t *conn, const char *fmt, ...)
356{
357 va_list ap;
358 size_t len;
359 char *msg;
360 int r;
361
362 va_start(ap, fmt);
363 len = vasprintf(&msg, fmt, ap);
364 va_end(ap);
365
366 if (msg == NULL) {
367 errno = ENOMEM;
368 _fetch_syserr();
369 return (-1);
370 }
371
372 r = _fetch_putln(conn, msg, len);
373 free(msg);
374
375 if (r == -1) {
376 _fetch_syserr();
377 return (-1);
378 }
379
380 return (0);
381}
382
383/*
384 * Get and parse status line
385 */
386static int
387_http_get_reply(conn_t *conn)
388{
389 char *p;
390
391 if (_fetch_getln(conn) == -1)
392 return (-1);
393 /*
394 * A valid status line looks like "HTTP/m.n xyz reason" where m
395 * and n are the major and minor protocol version numbers and xyz
396 * is the reply code.
397 * Unfortunately, there are servers out there (NCSA 1.5.1, to name
398 * just one) that do not send a version number, so we can't rely
399 * on finding one, but if we do, insist on it being 1.0 or 1.1.
400 * We don't care about the reason phrase.
401 */
402 if (strncmp(conn->buf, "HTTP", 4) != 0)
403 return (HTTP_PROTOCOL_ERROR);
404 p = conn->buf + 4;
405 if (*p == '/') {
406 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1'))
407 return (HTTP_PROTOCOL_ERROR);
408 p += 4;
409 }
410 if (*p != ' ' || !isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3]))
411 return (HTTP_PROTOCOL_ERROR);
412
413 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0');
414 return (conn->err);
415}
416
417/*
418 * Check a header; if the type matches the given string, return a pointer
419 * to the beginning of the value.
420 */
421static const char *
422_http_match(const char *str, const char *hdr)
423{
424 while (*str && *hdr && tolower(*str++) == tolower(*hdr++))
425 /* nothing */;
426 if (*str || *hdr != ':')
427 return (NULL);
428 while (*hdr && isspace(*++hdr))
429 /* nothing */;
430 return (hdr);
431}
432
433/*
434 * Get the next header and return the appropriate symbolic code.
435 */
436static hdr_t
437_http_next_header(conn_t *conn, const char **p)
438{
439 int i;
440
441 if (_fetch_getln(conn) == -1)
442 return (hdr_syserror);
443 while (conn->buflen && isspace(conn->buf[conn->buflen - 1]))
444 conn->buflen--;
445 conn->buf[conn->buflen] = '\0';
446 if (conn->buflen == 0)
447 return (hdr_end);
448 /*
449 * We could check for malformed headers but we don't really care.
450 * A valid header starts with a token immediately followed by a
451 * colon; a token is any sequence of non-control, non-whitespace
452 * characters except "()<>@,;:\\\"{}".
453 */
454 for (i = 0; hdr_names[i].num != hdr_unknown; i++)
455 if ((*p = _http_match(hdr_names[i].name, conn->buf)) != NULL)
456 return (hdr_names[i].num);
457 return (hdr_unknown);
458}
459
460/*
461 * Parse a last-modified header
462 */
463static int
464_http_parse_mtime(const char *p, time_t *mtime)
465{
466 char locale[64], *r;
467 struct tm tm;
468
469 strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale);
470 setlocale(LC_TIME, "C");
471 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
472 /* XXX should add support for date-2 and date-3 */
473 setlocale(LC_TIME, locale);
474 if (r == NULL)
475 return (-1);
476 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d "
477 "%02d:%02d:%02d]\n",
478 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
479 tm.tm_hour, tm.tm_min, tm.tm_sec));
480 *mtime = timegm(&tm);
481 return (0);
482}
483
484/*
485 * Parse a content-length header
486 */
487static int
488_http_parse_length(const char *p, off_t *length)
489{
490 off_t len;
491
492 for (len = 0; *p && isdigit(*p); ++p)
493 len = len * 10 + (*p - '0');
494 if (*p)
495 return (-1);
496 DEBUG(fprintf(stderr, "content length: [%lld]\n",
497 (long long)len));
498 *length = len;
499 return (0);
500}
501
502/*
503 * Parse a content-range header
504 */
505static int
506_http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size)
507{
508 off_t first, last, len;
509
510 if (strncasecmp(p, "bytes ", 6) != 0)
511 return (-1);
512 for (first = 0, p += 6; *p && isdigit(*p); ++p)
513 first = first * 10 + *p - '0';
514 if (*p != '-')
515 return (-1);
516 for (last = 0, ++p; *p && isdigit(*p); ++p)
517 last = last * 10 + *p - '0';
518 if (first > last || *p != '/')
519 return (-1);
520 for (len = 0, ++p; *p && isdigit(*p); ++p)
521 len = len * 10 + *p - '0';
522 if (*p || len < last - first + 1)
523 return (-1);
524 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n",
525 (long long)first, (long long)last, (long long)len));
526 *offset = first;
527 *length = last - first + 1;
528 *size = len;
529 return (0);
530}
531
532
533/*****************************************************************************
534 * Helper functions for authorization
535 */
536
537/*
538 * Base64 encoding
539 */
540static char *
541_http_base64(const char *src)
542{
543 static const char base64[] =
544 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
545 "abcdefghijklmnopqrstuvwxyz"
546 "0123456789+/";
547 char *str, *dst;
548 size_t l;
549 int t, r;
550
551 l = strlen(src);
552 if ((str = malloc(((l + 2) / 3) * 4)) == NULL)
553 return (NULL);
554 dst = str;
555 r = 0;
556
557 while (l >= 3) {
558 t = (src[0] << 16) | (src[1] << 8) | src[2];
559 dst[0] = base64[(t >> 18) & 0x3f];
560 dst[1] = base64[(t >> 12) & 0x3f];
561 dst[2] = base64[(t >> 6) & 0x3f];
562 dst[3] = base64[(t >> 0) & 0x3f];
563 src += 3; l -= 3;
564 dst += 4; r += 4;
565 }
566
567 switch (l) {
568 case 2:
569 t = (src[0] << 16) | (src[1] << 8);
570 dst[0] = base64[(t >> 18) & 0x3f];
571 dst[1] = base64[(t >> 12) & 0x3f];
572 dst[2] = base64[(t >> 6) & 0x3f];
573 dst[3] = '=';
574 dst += 4;
575 r += 4;
576 break;
577 case 1:
578 t = src[0] << 16;
579 dst[0] = base64[(t >> 18) & 0x3f];
580 dst[1] = base64[(t >> 12) & 0x3f];
581 dst[2] = dst[3] = '=';
582 dst += 4;
583 r += 4;
584 break;
585 case 0:
586 break;
587 }
588
589 *dst = 0;
590 return (str);
591}
592
593/*
594 * Encode username and password
595 */
596static int
597_http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd)
598{
599 char *upw, *auth;
600 int r;
601
602 DEBUG(fprintf(stderr, "usr: [%s]\n", usr));
603 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd));
604 if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
605 return (-1);
606 auth = _http_base64(upw);
607 free(upw);
608 if (auth == NULL)
609 return (-1);
610 r = _http_cmd(conn, "%s: Basic %s", hdr, auth);
611 free(auth);
612 return (r);
613}
614
615/*
616 * Send an authorization header
617 */
618static int
619_http_authorize(conn_t *conn, const char *hdr, const char *p)
620{
621 /* basic authorization */
622 if (strncasecmp(p, "basic:", 6) == 0) {
623 char *user, *pwd, *str;
624 int r;
625
626 /* skip realm */
627 for (p += 6; *p && *p != ':'; ++p)
628 /* nothing */ ;
629 if (!*p || strchr(++p, ':') == NULL)
630 return (-1);
631 if ((str = strdup(p)) == NULL)
632 return (-1); /* XXX */
633 user = str;
634 pwd = strchr(str, ':');
635 *pwd++ = '\0';
636 r = _http_basic_auth(conn, hdr, user, pwd);
637 free(str);
638 return (r);
639 }
640 return (-1);
641}
642
643
644/*****************************************************************************
645 * Helper functions for connecting to a server or proxy
646 */
647
648/*
649 * Connect to the correct HTTP server or proxy.
650 */
651static conn_t *
652_http_connect(struct url *URL, struct url *purl, const char *flags)
653{
654 conn_t *conn;
655 int verbose;
656 int af;
657
658#ifdef INET6
659 af = AF_UNSPEC;
660#else
661 af = AF_INET;
662#endif
663
664 verbose = CHECK_FLAG('v');
665 if (CHECK_FLAG('4'))
666 af = AF_INET;
667#ifdef INET6
668 else if (CHECK_FLAG('6'))
669 af = AF_INET6;
670#endif
671
672 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) {
673 URL = purl;
674 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) {
675 /* can't talk http to an ftp server */
676 /* XXX should set an error code */
677 return (NULL);
678 }
679
680 if ((conn = _fetch_connect(URL->host, URL->port, af, verbose)) == NULL)
681 /* _fetch_connect() has already set an error code */
682 return (NULL);
683 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 &&
684 _fetch_ssl(conn, verbose) == -1) {
685 _fetch_close(conn);
| 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
67#include <ctype.h>
68#include <err.h>
69#include <errno.h>
70#include <locale.h>
71#include <netdb.h>
72#include <stdarg.h>
73#include <stdio.h>
74#include <stdlib.h>
75#include <string.h>
76#include <time.h>
77#include <unistd.h>
78
79#include "fetch.h"
80#include "common.h"
81#include "httperr.h"
82
83/* Maximum number of redirects to follow */
84#define MAX_REDIRECT 5
85
86/* Symbolic names for reply codes we care about */
87#define HTTP_OK 200
88#define HTTP_PARTIAL 206
89#define HTTP_MOVED_PERM 301
90#define HTTP_MOVED_TEMP 302
91#define HTTP_SEE_OTHER 303
92#define HTTP_NEED_AUTH 401
93#define HTTP_NEED_PROXY_AUTH 407
94#define HTTP_PROTOCOL_ERROR 999
95
96#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
97 || (xyz) == HTTP_MOVED_TEMP \
98 || (xyz) == HTTP_SEE_OTHER)
99
100#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599)
101
102
103/*****************************************************************************
104 * I/O functions for decoding chunked streams
105 */
106
107struct httpio
108{
109 conn_t *conn; /* connection */
110 int chunked; /* chunked mode */
111 char *buf; /* chunk buffer */
112 size_t bufsize; /* size of chunk buffer */
113 ssize_t buflen; /* amount of data currently in buffer */
114 int bufpos; /* current read offset in buffer */
115 int eof; /* end-of-file flag */
116 int error; /* error flag */
117 size_t chunksize; /* remaining size of current chunk */
118#ifndef NDEBUG
119 size_t total;
120#endif
121};
122
123/*
124 * Get next chunk header
125 */
126static int
127_http_new_chunk(struct httpio *io)
128{
129 char *p;
130
131 if (_fetch_getln(io->conn) == -1)
132 return (-1);
133
134 if (io->conn->buflen < 2 || !ishexnumber(*io->conn->buf))
135 return (-1);
136
137 for (p = io->conn->buf; *p && !isspace(*p); ++p) {
138 if (*p == ';')
139 break;
140 if (!ishexnumber(*p))
141 return (-1);
142 if (isdigit(*p)) {
143 io->chunksize = io->chunksize * 16 +
144 *p - '0';
145 } else {
146 io->chunksize = io->chunksize * 16 +
147 10 + tolower(*p) - 'a';
148 }
149 }
150
151#ifndef NDEBUG
152 if (fetchDebug) {
153 io->total += io->chunksize;
154 if (io->chunksize == 0)
155 fprintf(stderr, "_http_fillbuf(): "
156 "end of last chunk\n");
157 else
158 fprintf(stderr, "_http_fillbuf(): "
159 "new chunk: %lu (%lu)\n",
160 (unsigned long)io->chunksize, (unsigned long)io->total);
161 }
162#endif
163
164 return (io->chunksize);
165}
166
167/*
168 * Grow the input buffer to at least len bytes
169 */
170static inline int
171_http_growbuf(struct httpio *io, size_t len)
172{
173 char *tmp;
174
175 if (io->bufsize >= len)
176 return (0);
177
178 if ((tmp = realloc(io->buf, len)) == NULL)
179 return (-1);
180 io->buf = tmp;
181 io->bufsize = len;
182}
183
184/*
185 * Fill the input buffer, do chunk decoding on the fly
186 */
187static int
188_http_fillbuf(struct httpio *io, size_t len)
189{
190 if (io->error)
191 return (-1);
192 if (io->eof)
193 return (0);
194
195 if (io->chunked == 0) {
196 if (_http_growbuf(io, len) == -1)
197 return (-1);
198 if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1)
199 return (-1);
200 io->bufpos = 0;
201 return (io->buflen);
202 }
203
204 if (io->chunksize == 0) {
205 switch (_http_new_chunk(io)) {
206 case -1:
207 io->error = 1;
208 return (-1);
209 case 0:
210 io->eof = 1;
211 return (0);
212 }
213 }
214
215 if (len > io->chunksize)
216 len = io->chunksize;
217 if (_http_growbuf(io, len) == -1)
218 return (-1);
219 if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1)
220 return (-1);
221 io->chunksize -= io->buflen;
222
223 if (io->chunksize == 0) {
224 char endl[2];
225
226 if (_fetch_read(io->conn, endl, 2) != 2 ||
227 endl[0] != '\r' || endl[1] != '\n')
228 return (-1);
229 }
230
231 io->bufpos = 0;
232
233 return (io->buflen);
234}
235
236/*
237 * Read function
238 */
239static int
240_http_readfn(void *v, char *buf, int len)
241{
242 struct httpio *io = (struct httpio *)v;
243 int l, pos;
244
245 if (io->error)
246 return (-1);
247 if (io->eof)
248 return (0);
249
250 for (pos = 0; len > 0; pos += l, len -= l) {
251 /* empty buffer */
252 if (!io->buf || io->bufpos == io->buflen)
253 if (_http_fillbuf(io, len) < 1)
254 break;
255 l = io->buflen - io->bufpos;
256 if (len < l)
257 l = len;
258 bcopy(io->buf + io->bufpos, buf + pos, l);
259 io->bufpos += l;
260 }
261
262 if (!pos && io->error)
263 return (-1);
264 return (pos);
265}
266
267/*
268 * Write function
269 */
270static int
271_http_writefn(void *v, const char *buf, int len)
272{
273 struct httpio *io = (struct httpio *)v;
274
275 return (_fetch_write(io->conn, buf, len));
276}
277
278/*
279 * Close function
280 */
281static int
282_http_closefn(void *v)
283{
284 struct httpio *io = (struct httpio *)v;
285 int r;
286
287 r = _fetch_close(io->conn);
288 if (io->buf)
289 free(io->buf);
290 free(io);
291 return (r);
292}
293
294/*
295 * Wrap a file descriptor up
296 */
297static FILE *
298_http_funopen(conn_t *conn, int chunked)
299{
300 struct httpio *io;
301 FILE *f;
302
303 if ((io = calloc(1, sizeof *io)) == NULL) {
304 _fetch_syserr();
305 return (NULL);
306 }
307 io->conn = conn;
308 io->chunked = chunked;
309 f = funopen(io, _http_readfn, _http_writefn, NULL, _http_closefn);
310 if (f == NULL) {
311 _fetch_syserr();
312 free(io);
313 return (NULL);
314 }
315 return (f);
316}
317
318
319/*****************************************************************************
320 * Helper functions for talking to the server and parsing its replies
321 */
322
323/* Header types */
324typedef enum {
325 hdr_syserror = -2,
326 hdr_error = -1,
327 hdr_end = 0,
328 hdr_unknown = 1,
329 hdr_content_length,
330 hdr_content_range,
331 hdr_last_modified,
332 hdr_location,
333 hdr_transfer_encoding,
334 hdr_www_authenticate
335} hdr_t;
336
337/* Names of interesting headers */
338static struct {
339 hdr_t num;
340 const char *name;
341} hdr_names[] = {
342 { hdr_content_length, "Content-Length" },
343 { hdr_content_range, "Content-Range" },
344 { hdr_last_modified, "Last-Modified" },
345 { hdr_location, "Location" },
346 { hdr_transfer_encoding, "Transfer-Encoding" },
347 { hdr_www_authenticate, "WWW-Authenticate" },
348 { hdr_unknown, NULL },
349};
350
351/*
352 * Send a formatted line; optionally echo to terminal
353 */
354static int
355_http_cmd(conn_t *conn, const char *fmt, ...)
356{
357 va_list ap;
358 size_t len;
359 char *msg;
360 int r;
361
362 va_start(ap, fmt);
363 len = vasprintf(&msg, fmt, ap);
364 va_end(ap);
365
366 if (msg == NULL) {
367 errno = ENOMEM;
368 _fetch_syserr();
369 return (-1);
370 }
371
372 r = _fetch_putln(conn, msg, len);
373 free(msg);
374
375 if (r == -1) {
376 _fetch_syserr();
377 return (-1);
378 }
379
380 return (0);
381}
382
383/*
384 * Get and parse status line
385 */
386static int
387_http_get_reply(conn_t *conn)
388{
389 char *p;
390
391 if (_fetch_getln(conn) == -1)
392 return (-1);
393 /*
394 * A valid status line looks like "HTTP/m.n xyz reason" where m
395 * and n are the major and minor protocol version numbers and xyz
396 * is the reply code.
397 * Unfortunately, there are servers out there (NCSA 1.5.1, to name
398 * just one) that do not send a version number, so we can't rely
399 * on finding one, but if we do, insist on it being 1.0 or 1.1.
400 * We don't care about the reason phrase.
401 */
402 if (strncmp(conn->buf, "HTTP", 4) != 0)
403 return (HTTP_PROTOCOL_ERROR);
404 p = conn->buf + 4;
405 if (*p == '/') {
406 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1'))
407 return (HTTP_PROTOCOL_ERROR);
408 p += 4;
409 }
410 if (*p != ' ' || !isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3]))
411 return (HTTP_PROTOCOL_ERROR);
412
413 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0');
414 return (conn->err);
415}
416
417/*
418 * Check a header; if the type matches the given string, return a pointer
419 * to the beginning of the value.
420 */
421static const char *
422_http_match(const char *str, const char *hdr)
423{
424 while (*str && *hdr && tolower(*str++) == tolower(*hdr++))
425 /* nothing */;
426 if (*str || *hdr != ':')
427 return (NULL);
428 while (*hdr && isspace(*++hdr))
429 /* nothing */;
430 return (hdr);
431}
432
433/*
434 * Get the next header and return the appropriate symbolic code.
435 */
436static hdr_t
437_http_next_header(conn_t *conn, const char **p)
438{
439 int i;
440
441 if (_fetch_getln(conn) == -1)
442 return (hdr_syserror);
443 while (conn->buflen && isspace(conn->buf[conn->buflen - 1]))
444 conn->buflen--;
445 conn->buf[conn->buflen] = '\0';
446 if (conn->buflen == 0)
447 return (hdr_end);
448 /*
449 * We could check for malformed headers but we don't really care.
450 * A valid header starts with a token immediately followed by a
451 * colon; a token is any sequence of non-control, non-whitespace
452 * characters except "()<>@,;:\\\"{}".
453 */
454 for (i = 0; hdr_names[i].num != hdr_unknown; i++)
455 if ((*p = _http_match(hdr_names[i].name, conn->buf)) != NULL)
456 return (hdr_names[i].num);
457 return (hdr_unknown);
458}
459
460/*
461 * Parse a last-modified header
462 */
463static int
464_http_parse_mtime(const char *p, time_t *mtime)
465{
466 char locale[64], *r;
467 struct tm tm;
468
469 strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale);
470 setlocale(LC_TIME, "C");
471 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
472 /* XXX should add support for date-2 and date-3 */
473 setlocale(LC_TIME, locale);
474 if (r == NULL)
475 return (-1);
476 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d "
477 "%02d:%02d:%02d]\n",
478 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
479 tm.tm_hour, tm.tm_min, tm.tm_sec));
480 *mtime = timegm(&tm);
481 return (0);
482}
483
484/*
485 * Parse a content-length header
486 */
487static int
488_http_parse_length(const char *p, off_t *length)
489{
490 off_t len;
491
492 for (len = 0; *p && isdigit(*p); ++p)
493 len = len * 10 + (*p - '0');
494 if (*p)
495 return (-1);
496 DEBUG(fprintf(stderr, "content length: [%lld]\n",
497 (long long)len));
498 *length = len;
499 return (0);
500}
501
502/*
503 * Parse a content-range header
504 */
505static int
506_http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size)
507{
508 off_t first, last, len;
509
510 if (strncasecmp(p, "bytes ", 6) != 0)
511 return (-1);
512 for (first = 0, p += 6; *p && isdigit(*p); ++p)
513 first = first * 10 + *p - '0';
514 if (*p != '-')
515 return (-1);
516 for (last = 0, ++p; *p && isdigit(*p); ++p)
517 last = last * 10 + *p - '0';
518 if (first > last || *p != '/')
519 return (-1);
520 for (len = 0, ++p; *p && isdigit(*p); ++p)
521 len = len * 10 + *p - '0';
522 if (*p || len < last - first + 1)
523 return (-1);
524 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n",
525 (long long)first, (long long)last, (long long)len));
526 *offset = first;
527 *length = last - first + 1;
528 *size = len;
529 return (0);
530}
531
532
533/*****************************************************************************
534 * Helper functions for authorization
535 */
536
537/*
538 * Base64 encoding
539 */
540static char *
541_http_base64(const char *src)
542{
543 static const char base64[] =
544 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
545 "abcdefghijklmnopqrstuvwxyz"
546 "0123456789+/";
547 char *str, *dst;
548 size_t l;
549 int t, r;
550
551 l = strlen(src);
552 if ((str = malloc(((l + 2) / 3) * 4)) == NULL)
553 return (NULL);
554 dst = str;
555 r = 0;
556
557 while (l >= 3) {
558 t = (src[0] << 16) | (src[1] << 8) | src[2];
559 dst[0] = base64[(t >> 18) & 0x3f];
560 dst[1] = base64[(t >> 12) & 0x3f];
561 dst[2] = base64[(t >> 6) & 0x3f];
562 dst[3] = base64[(t >> 0) & 0x3f];
563 src += 3; l -= 3;
564 dst += 4; r += 4;
565 }
566
567 switch (l) {
568 case 2:
569 t = (src[0] << 16) | (src[1] << 8);
570 dst[0] = base64[(t >> 18) & 0x3f];
571 dst[1] = base64[(t >> 12) & 0x3f];
572 dst[2] = base64[(t >> 6) & 0x3f];
573 dst[3] = '=';
574 dst += 4;
575 r += 4;
576 break;
577 case 1:
578 t = src[0] << 16;
579 dst[0] = base64[(t >> 18) & 0x3f];
580 dst[1] = base64[(t >> 12) & 0x3f];
581 dst[2] = dst[3] = '=';
582 dst += 4;
583 r += 4;
584 break;
585 case 0:
586 break;
587 }
588
589 *dst = 0;
590 return (str);
591}
592
593/*
594 * Encode username and password
595 */
596static int
597_http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd)
598{
599 char *upw, *auth;
600 int r;
601
602 DEBUG(fprintf(stderr, "usr: [%s]\n", usr));
603 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd));
604 if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
605 return (-1);
606 auth = _http_base64(upw);
607 free(upw);
608 if (auth == NULL)
609 return (-1);
610 r = _http_cmd(conn, "%s: Basic %s", hdr, auth);
611 free(auth);
612 return (r);
613}
614
615/*
616 * Send an authorization header
617 */
618static int
619_http_authorize(conn_t *conn, const char *hdr, const char *p)
620{
621 /* basic authorization */
622 if (strncasecmp(p, "basic:", 6) == 0) {
623 char *user, *pwd, *str;
624 int r;
625
626 /* skip realm */
627 for (p += 6; *p && *p != ':'; ++p)
628 /* nothing */ ;
629 if (!*p || strchr(++p, ':') == NULL)
630 return (-1);
631 if ((str = strdup(p)) == NULL)
632 return (-1); /* XXX */
633 user = str;
634 pwd = strchr(str, ':');
635 *pwd++ = '\0';
636 r = _http_basic_auth(conn, hdr, user, pwd);
637 free(str);
638 return (r);
639 }
640 return (-1);
641}
642
643
644/*****************************************************************************
645 * Helper functions for connecting to a server or proxy
646 */
647
648/*
649 * Connect to the correct HTTP server or proxy.
650 */
651static conn_t *
652_http_connect(struct url *URL, struct url *purl, const char *flags)
653{
654 conn_t *conn;
655 int verbose;
656 int af;
657
658#ifdef INET6
659 af = AF_UNSPEC;
660#else
661 af = AF_INET;
662#endif
663
664 verbose = CHECK_FLAG('v');
665 if (CHECK_FLAG('4'))
666 af = AF_INET;
667#ifdef INET6
668 else if (CHECK_FLAG('6'))
669 af = AF_INET6;
670#endif
671
672 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) {
673 URL = purl;
674 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) {
675 /* can't talk http to an ftp server */
676 /* XXX should set an error code */
677 return (NULL);
678 }
679
680 if ((conn = _fetch_connect(URL->host, URL->port, af, verbose)) == NULL)
681 /* _fetch_connect() has already set an error code */
682 return (NULL);
683 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 &&
684 _fetch_ssl(conn, verbose) == -1) {
685 _fetch_close(conn);
|
686 return (NULL);
687 }
688 return (conn);
689}
690
691static struct url *
692_http_get_proxy(void)
693{
694 struct url *purl;
695 char *p;
696
697 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
698 (purl = fetchParseURL(p))) {
699 if (!*purl->scheme)
700 strcpy(purl->scheme, SCHEME_HTTP);
701 if (!purl->port)
702 purl->port = _fetch_default_proxy_port(purl->scheme);
703 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
704 return (purl);
705 fetchFreeURL(purl);
706 }
707 return (NULL);
708}
709
710static void
711_http_print_html(FILE *out, FILE *in)
712{
713 size_t len;
714 char *line, *p, *q;
715 int comment, tag;
716
717 comment = tag = 0;
718 while ((line = fgetln(in, &len)) != NULL) {
719 while (len && isspace(line[len - 1]))
720 --len;
721 for (p = q = line; q < line + len; ++q) {
722 if (comment && *q == '-') {
723 if (q + 2 < line + len &&
724 strcmp(q, "-->") == 0) {
725 tag = comment = 0;
726 q += 2;
727 }
728 } else if (tag && !comment && *q == '>') {
729 p = q + 1;
730 tag = 0;
731 } else if (!tag && *q == '<') {
732 if (q > p)
733 fwrite(p, q - p, 1, out);
734 tag = 1;
735 if (q + 3 < line + len &&
736 strcmp(q, "<!--") == 0) {
737 comment = 1;
738 q += 3;
739 }
740 }
741 }
742 if (!tag && q > p)
743 fwrite(p, q - p, 1, out);
744 fputc('\n', out);
745 }
746}
747
748
749/*****************************************************************************
750 * Core
751 */
752
753/*
754 * Send a request and process the reply
755 *
756 * XXX This function is way too long, the do..while loop should be split
757 * XXX off into a separate function.
758 */
759FILE *
760_http_request(struct url *URL, const char *op, struct url_stat *us,
761 struct url *purl, const char *flags)
762{
763 conn_t *conn;
764 struct url *url, *new;
765 int chunked, direct, need_auth, noredirect, verbose;
766 int i, n;
767 off_t offset, clength, length, size;
768 time_t mtime;
769 const char *p;
770 FILE *f;
771 hdr_t h;
772 char *host;
773#ifdef INET6
774 char hbuf[MAXHOSTNAMELEN + 1];
775#endif
776
777 direct = CHECK_FLAG('d');
778 noredirect = CHECK_FLAG('A');
779 verbose = CHECK_FLAG('v');
780
781 if (direct && purl) {
782 fetchFreeURL(purl);
783 purl = NULL;
784 }
785
786 /* try the provided URL first */
787 url = URL;
788
789 /* if the A flag is set, we only get one try */
790 n = noredirect ? 1 : MAX_REDIRECT;
791 i = 0;
792
793 need_auth = 0;
794 do {
795 new = NULL;
796 chunked = 0;
797 offset = 0;
798 clength = -1;
799 length = -1;
800 size = -1;
801 mtime = 0;
802
803 /* check port */
804 if (!url->port)
805 url->port = _fetch_default_port(url->scheme);
806
807 /* were we redirected to an FTP URL? */
808 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) {
809 if (strcmp(op, "GET") == 0)
810 return (_ftp_request(url, "RETR", us, purl, flags));
811 else if (strcmp(op, "HEAD") == 0)
812 return (_ftp_request(url, "STAT", us, purl, flags));
813 }
814
815 /* connect to server or proxy */
816 if ((conn = _http_connect(url, purl, flags)) == NULL)
817 goto ouch;
818
819 host = url->host;
820#ifdef INET6
821 if (strchr(url->host, ':')) {
822 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host);
823 host = hbuf;
824 }
825#endif
826
827 /* send request */
828 if (verbose)
829 _fetch_info("requesting %s://%s:%d%s",
830 url->scheme, host, url->port, url->doc);
831 if (purl) {
832 _http_cmd(conn, "%s %s://%s:%d%s HTTP/1.1",
833 op, url->scheme, host, url->port, url->doc);
834 } else {
835 _http_cmd(conn, "%s %s HTTP/1.1",
836 op, url->doc);
837 }
838
839 /* virtual host */
840 if (url->port == _fetch_default_port(url->scheme))
841 _http_cmd(conn, "Host: %s", host);
842 else
843 _http_cmd(conn, "Host: %s:%d", host, url->port);
844
845 /* proxy authorization */
846 if (purl) {
847 if (*purl->user || *purl->pwd)
848 _http_basic_auth(conn, "Proxy-Authorization",
849 purl->user, purl->pwd);
850 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0')
851 _http_authorize(conn, "Proxy-Authorization", p);
852 }
853
854 /* server authorization */
855 if (need_auth || *url->user || *url->pwd) {
856 if (*url->user || *url->pwd)
857 _http_basic_auth(conn, "Authorization", url->user, url->pwd);
858 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0')
859 _http_authorize(conn, "Authorization", p);
860 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) {
861 _http_basic_auth(conn, "Authorization", url->user, url->pwd);
862 } else {
863 _http_seterr(HTTP_NEED_AUTH);
864 goto ouch;
865 }
866 }
867
868 /* other headers */
869 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0')
870 _http_cmd(conn, "User-Agent: %s", p);
871 else
872 _http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname());
873 if (url->offset)
874 _http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset);
875 _http_cmd(conn, "Connection: close");
876 _http_cmd(conn, "");
877
878 /* get reply */
879 switch (_http_get_reply(conn)) {
880 case HTTP_OK:
881 case HTTP_PARTIAL:
882 /* fine */
883 break;
884 case HTTP_MOVED_PERM:
885 case HTTP_MOVED_TEMP:
886 case HTTP_SEE_OTHER:
887 /*
888 * Not so fine, but we still have to read the headers to
889 * get the new location.
890 */
891 break;
892 case HTTP_NEED_AUTH:
893 if (need_auth) {
894 /*
895 * We already sent out authorization code, so there's
896 * nothing more we can do.
897 */
898 _http_seterr(conn->err);
899 goto ouch;
900 }
901 /* try again, but send the password this time */
902 if (verbose)
903 _fetch_info("server requires authorization");
904 break;
905 case HTTP_NEED_PROXY_AUTH:
906 /*
907 * If we're talking to a proxy, we already sent our proxy
908 * authorization code, so there's nothing more we can do.
909 */
910 _http_seterr(conn->err);
911 goto ouch;
912 case HTTP_PROTOCOL_ERROR:
913 /* fall through */
914 case -1:
915 _fetch_syserr();
916 goto ouch;
917 default:
918 _http_seterr(conn->err);
919 if (!verbose)
920 goto ouch;
921 /* fall through so we can get the full error message */
922 }
923
924 /* get headers */
925 do {
926 switch ((h = _http_next_header(conn, &p))) {
927 case hdr_syserror:
928 _fetch_syserr();
929 goto ouch;
930 case hdr_error:
931 _http_seterr(HTTP_PROTOCOL_ERROR);
932 goto ouch;
933 case hdr_content_length:
934 _http_parse_length(p, &clength);
935 break;
936 case hdr_content_range:
937 _http_parse_range(p, &offset, &length, &size);
938 break;
939 case hdr_last_modified:
940 _http_parse_mtime(p, &mtime);
941 break;
942 case hdr_location:
943 if (!HTTP_REDIRECT(conn->err))
944 break;
945 if (new)
946 free(new);
947 if (verbose)
948 _fetch_info("%d redirect to %s", conn->err, p);
949 if (*p == '/')
950 /* absolute path */
951 new = fetchMakeURL(url->scheme, url->host, url->port, p,
952 url->user, url->pwd);
953 else
954 new = fetchParseURL(p);
955 if (new == NULL) {
956 /* XXX should set an error code */
957 DEBUG(fprintf(stderr, "failed to parse new URL\n"));
958 goto ouch;
959 }
960 if (!*new->user && !*new->pwd) {
961 strcpy(new->user, url->user);
962 strcpy(new->pwd, url->pwd);
963 }
964 new->offset = url->offset;
965 new->length = url->length;
966 break;
967 case hdr_transfer_encoding:
968 /* XXX weak test*/
969 chunked = (strcasecmp(p, "chunked") == 0);
970 break;
971 case hdr_www_authenticate:
972 if (conn->err != HTTP_NEED_AUTH)
973 break;
974 /* if we were smarter, we'd check the method and realm */
975 break;
976 case hdr_end:
977 /* fall through */
978 case hdr_unknown:
979 /* ignore */
980 break;
981 }
982 } while (h > hdr_end);
983
984 /* we have a hit or an error */
985 if (conn->err == HTTP_OK || conn->err == HTTP_PARTIAL || HTTP_ERROR(conn->err))
986 break;
987
988 /* we need to provide authentication */
989 if (conn->err == HTTP_NEED_AUTH) {
990 need_auth = 1;
991 _fetch_close(conn);
992 conn = NULL;
993 continue;
994 }
995
996 /* all other cases: we got a redirect */
997 need_auth = 0;
998 _fetch_close(conn);
999 conn = NULL;
1000 if (!new) {
1001 DEBUG(fprintf(stderr, "redirect with no new location\n"));
1002 break;
1003 }
1004 if (url != URL)
1005 fetchFreeURL(url);
1006 url = new;
1007 } while (++i < n);
1008
1009 /* we failed, or ran out of retries */
1010 if (conn == NULL) {
1011 _http_seterr(conn->err);
1012 goto ouch;
1013 }
1014
1015 DEBUG(fprintf(stderr, "offset %lld, length %lld,"
1016 " size %lld, clength %lld\n",
1017 (long long)offset, (long long)length,
1018 (long long)size, (long long)clength));
1019
1020 /* check for inconsistencies */
1021 if (clength != -1 && length != -1 && clength != length) {
1022 _http_seterr(HTTP_PROTOCOL_ERROR);
1023 goto ouch;
1024 }
1025 if (clength == -1)
1026 clength = length;
1027 if (clength != -1)
1028 length = offset + clength;
1029 if (length != -1 && size != -1 && length != size) {
1030 _http_seterr(HTTP_PROTOCOL_ERROR);
1031 goto ouch;
1032 }
1033 if (size == -1)
1034 size = length;
1035
1036 /* fill in stats */
1037 if (us) {
1038 us->size = size;
1039 us->atime = us->mtime = mtime;
1040 }
1041
1042 /* too far? */
1043 if (offset > URL->offset) {
1044 _http_seterr(HTTP_PROTOCOL_ERROR);
1045 goto ouch;
1046 }
1047
1048 /* report back real offset and size */
1049 URL->offset = offset;
1050 URL->length = clength;
1051
1052 /* wrap it up in a FILE */
1053 if ((f = _http_funopen(conn, chunked)) == NULL) {
1054 _fetch_syserr();
1055 goto ouch;
1056 }
1057
1058 if (url != URL)
1059 fetchFreeURL(url);
1060 if (purl)
1061 fetchFreeURL(purl);
1062
1063 if (HTTP_ERROR(conn->err)) {
1064 _http_print_html(stderr, f);
1065 fclose(f);
1066 f = NULL;
1067 }
1068
1069 return (f);
1070
1071ouch:
1072 if (url != URL)
1073 fetchFreeURL(url);
1074 if (purl)
1075 fetchFreeURL(purl);
1076 if (conn != NULL)
1077 _fetch_close(conn);
1078 return (NULL);
1079}
1080
1081
1082/*****************************************************************************
1083 * Entry points
1084 */
1085
1086/*
1087 * Retrieve and stat a file by HTTP
1088 */
1089FILE *
1090fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags)
1091{
1092 return (_http_request(URL, "GET", us, _http_get_proxy(), flags));
1093}
1094
1095/*
1096 * Retrieve a file by HTTP
1097 */
1098FILE *
1099fetchGetHTTP(struct url *URL, const char *flags)
1100{
1101 return (fetchXGetHTTP(URL, NULL, flags));
1102}
1103
1104/*
1105 * Store a file by HTTP
1106 */
1107FILE *
1108fetchPutHTTP(struct url *URL __unused, const char *flags __unused)
1109{
1110 warnx("fetchPutHTTP(): not implemented");
1111 return (NULL);
1112}
1113
1114/*
1115 * Get an HTTP document's metadata
1116 */
1117int
1118fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags)
1119{
1120 FILE *f;
1121
1122 if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL)
1123 return (-1);
1124 fclose(f);
1125 return (0);
1126}
1127
1128/*
1129 * List a directory
1130 */
1131struct url_ent *
1132fetchListHTTP(struct url *url __unused, const char *flags __unused)
1133{
1134 warnx("fetchListHTTP(): not implemented");
1135 return (NULL);
1136}
| 689 return (NULL);
690 }
691 return (conn);
692}
693
694static struct url *
695_http_get_proxy(void)
696{
697 struct url *purl;
698 char *p;
699
700 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
701 (purl = fetchParseURL(p))) {
702 if (!*purl->scheme)
703 strcpy(purl->scheme, SCHEME_HTTP);
704 if (!purl->port)
705 purl->port = _fetch_default_proxy_port(purl->scheme);
706 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
707 return (purl);
708 fetchFreeURL(purl);
709 }
710 return (NULL);
711}
712
713static void
714_http_print_html(FILE *out, FILE *in)
715{
716 size_t len;
717 char *line, *p, *q;
718 int comment, tag;
719
720 comment = tag = 0;
721 while ((line = fgetln(in, &len)) != NULL) {
722 while (len && isspace(line[len - 1]))
723 --len;
724 for (p = q = line; q < line + len; ++q) {
725 if (comment && *q == '-') {
726 if (q + 2 < line + len &&
727 strcmp(q, "-->") == 0) {
728 tag = comment = 0;
729 q += 2;
730 }
731 } else if (tag && !comment && *q == '>') {
732 p = q + 1;
733 tag = 0;
734 } else if (!tag && *q == '<') {
735 if (q > p)
736 fwrite(p, q - p, 1, out);
737 tag = 1;
738 if (q + 3 < line + len &&
739 strcmp(q, "<!--") == 0) {
740 comment = 1;
741 q += 3;
742 }
743 }
744 }
745 if (!tag && q > p)
746 fwrite(p, q - p, 1, out);
747 fputc('\n', out);
748 }
749}
750
751
752/*****************************************************************************
753 * Core
754 */
755
756/*
757 * Send a request and process the reply
758 *
759 * XXX This function is way too long, the do..while loop should be split
760 * XXX off into a separate function.
761 */
762FILE *
763_http_request(struct url *URL, const char *op, struct url_stat *us,
764 struct url *purl, const char *flags)
765{
766 conn_t *conn;
767 struct url *url, *new;
768 int chunked, direct, need_auth, noredirect, verbose;
769 int i, n;
770 off_t offset, clength, length, size;
771 time_t mtime;
772 const char *p;
773 FILE *f;
774 hdr_t h;
775 char *host;
776#ifdef INET6
777 char hbuf[MAXHOSTNAMELEN + 1];
778#endif
779
780 direct = CHECK_FLAG('d');
781 noredirect = CHECK_FLAG('A');
782 verbose = CHECK_FLAG('v');
783
784 if (direct && purl) {
785 fetchFreeURL(purl);
786 purl = NULL;
787 }
788
789 /* try the provided URL first */
790 url = URL;
791
792 /* if the A flag is set, we only get one try */
793 n = noredirect ? 1 : MAX_REDIRECT;
794 i = 0;
795
796 need_auth = 0;
797 do {
798 new = NULL;
799 chunked = 0;
800 offset = 0;
801 clength = -1;
802 length = -1;
803 size = -1;
804 mtime = 0;
805
806 /* check port */
807 if (!url->port)
808 url->port = _fetch_default_port(url->scheme);
809
810 /* were we redirected to an FTP URL? */
811 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) {
812 if (strcmp(op, "GET") == 0)
813 return (_ftp_request(url, "RETR", us, purl, flags));
814 else if (strcmp(op, "HEAD") == 0)
815 return (_ftp_request(url, "STAT", us, purl, flags));
816 }
817
818 /* connect to server or proxy */
819 if ((conn = _http_connect(url, purl, flags)) == NULL)
820 goto ouch;
821
822 host = url->host;
823#ifdef INET6
824 if (strchr(url->host, ':')) {
825 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host);
826 host = hbuf;
827 }
828#endif
829
830 /* send request */
831 if (verbose)
832 _fetch_info("requesting %s://%s:%d%s",
833 url->scheme, host, url->port, url->doc);
834 if (purl) {
835 _http_cmd(conn, "%s %s://%s:%d%s HTTP/1.1",
836 op, url->scheme, host, url->port, url->doc);
837 } else {
838 _http_cmd(conn, "%s %s HTTP/1.1",
839 op, url->doc);
840 }
841
842 /* virtual host */
843 if (url->port == _fetch_default_port(url->scheme))
844 _http_cmd(conn, "Host: %s", host);
845 else
846 _http_cmd(conn, "Host: %s:%d", host, url->port);
847
848 /* proxy authorization */
849 if (purl) {
850 if (*purl->user || *purl->pwd)
851 _http_basic_auth(conn, "Proxy-Authorization",
852 purl->user, purl->pwd);
853 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0')
854 _http_authorize(conn, "Proxy-Authorization", p);
855 }
856
857 /* server authorization */
858 if (need_auth || *url->user || *url->pwd) {
859 if (*url->user || *url->pwd)
860 _http_basic_auth(conn, "Authorization", url->user, url->pwd);
861 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0')
862 _http_authorize(conn, "Authorization", p);
863 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) {
864 _http_basic_auth(conn, "Authorization", url->user, url->pwd);
865 } else {
866 _http_seterr(HTTP_NEED_AUTH);
867 goto ouch;
868 }
869 }
870
871 /* other headers */
872 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0')
873 _http_cmd(conn, "User-Agent: %s", p);
874 else
875 _http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname());
876 if (url->offset)
877 _http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset);
878 _http_cmd(conn, "Connection: close");
879 _http_cmd(conn, "");
880
881 /* get reply */
882 switch (_http_get_reply(conn)) {
883 case HTTP_OK:
884 case HTTP_PARTIAL:
885 /* fine */
886 break;
887 case HTTP_MOVED_PERM:
888 case HTTP_MOVED_TEMP:
889 case HTTP_SEE_OTHER:
890 /*
891 * Not so fine, but we still have to read the headers to
892 * get the new location.
893 */
894 break;
895 case HTTP_NEED_AUTH:
896 if (need_auth) {
897 /*
898 * We already sent out authorization code, so there's
899 * nothing more we can do.
900 */
901 _http_seterr(conn->err);
902 goto ouch;
903 }
904 /* try again, but send the password this time */
905 if (verbose)
906 _fetch_info("server requires authorization");
907 break;
908 case HTTP_NEED_PROXY_AUTH:
909 /*
910 * If we're talking to a proxy, we already sent our proxy
911 * authorization code, so there's nothing more we can do.
912 */
913 _http_seterr(conn->err);
914 goto ouch;
915 case HTTP_PROTOCOL_ERROR:
916 /* fall through */
917 case -1:
918 _fetch_syserr();
919 goto ouch;
920 default:
921 _http_seterr(conn->err);
922 if (!verbose)
923 goto ouch;
924 /* fall through so we can get the full error message */
925 }
926
927 /* get headers */
928 do {
929 switch ((h = _http_next_header(conn, &p))) {
930 case hdr_syserror:
931 _fetch_syserr();
932 goto ouch;
933 case hdr_error:
934 _http_seterr(HTTP_PROTOCOL_ERROR);
935 goto ouch;
936 case hdr_content_length:
937 _http_parse_length(p, &clength);
938 break;
939 case hdr_content_range:
940 _http_parse_range(p, &offset, &length, &size);
941 break;
942 case hdr_last_modified:
943 _http_parse_mtime(p, &mtime);
944 break;
945 case hdr_location:
946 if (!HTTP_REDIRECT(conn->err))
947 break;
948 if (new)
949 free(new);
950 if (verbose)
951 _fetch_info("%d redirect to %s", conn->err, p);
952 if (*p == '/')
953 /* absolute path */
954 new = fetchMakeURL(url->scheme, url->host, url->port, p,
955 url->user, url->pwd);
956 else
957 new = fetchParseURL(p);
958 if (new == NULL) {
959 /* XXX should set an error code */
960 DEBUG(fprintf(stderr, "failed to parse new URL\n"));
961 goto ouch;
962 }
963 if (!*new->user && !*new->pwd) {
964 strcpy(new->user, url->user);
965 strcpy(new->pwd, url->pwd);
966 }
967 new->offset = url->offset;
968 new->length = url->length;
969 break;
970 case hdr_transfer_encoding:
971 /* XXX weak test*/
972 chunked = (strcasecmp(p, "chunked") == 0);
973 break;
974 case hdr_www_authenticate:
975 if (conn->err != HTTP_NEED_AUTH)
976 break;
977 /* if we were smarter, we'd check the method and realm */
978 break;
979 case hdr_end:
980 /* fall through */
981 case hdr_unknown:
982 /* ignore */
983 break;
984 }
985 } while (h > hdr_end);
986
987 /* we have a hit or an error */
988 if (conn->err == HTTP_OK || conn->err == HTTP_PARTIAL || HTTP_ERROR(conn->err))
989 break;
990
991 /* we need to provide authentication */
992 if (conn->err == HTTP_NEED_AUTH) {
993 need_auth = 1;
994 _fetch_close(conn);
995 conn = NULL;
996 continue;
997 }
998
999 /* all other cases: we got a redirect */
1000 need_auth = 0;
1001 _fetch_close(conn);
1002 conn = NULL;
1003 if (!new) {
1004 DEBUG(fprintf(stderr, "redirect with no new location\n"));
1005 break;
1006 }
1007 if (url != URL)
1008 fetchFreeURL(url);
1009 url = new;
1010 } while (++i < n);
1011
1012 /* we failed, or ran out of retries */
1013 if (conn == NULL) {
1014 _http_seterr(conn->err);
1015 goto ouch;
1016 }
1017
1018 DEBUG(fprintf(stderr, "offset %lld, length %lld,"
1019 " size %lld, clength %lld\n",
1020 (long long)offset, (long long)length,
1021 (long long)size, (long long)clength));
1022
1023 /* check for inconsistencies */
1024 if (clength != -1 && length != -1 && clength != length) {
1025 _http_seterr(HTTP_PROTOCOL_ERROR);
1026 goto ouch;
1027 }
1028 if (clength == -1)
1029 clength = length;
1030 if (clength != -1)
1031 length = offset + clength;
1032 if (length != -1 && size != -1 && length != size) {
1033 _http_seterr(HTTP_PROTOCOL_ERROR);
1034 goto ouch;
1035 }
1036 if (size == -1)
1037 size = length;
1038
1039 /* fill in stats */
1040 if (us) {
1041 us->size = size;
1042 us->atime = us->mtime = mtime;
1043 }
1044
1045 /* too far? */
1046 if (offset > URL->offset) {
1047 _http_seterr(HTTP_PROTOCOL_ERROR);
1048 goto ouch;
1049 }
1050
1051 /* report back real offset and size */
1052 URL->offset = offset;
1053 URL->length = clength;
1054
1055 /* wrap it up in a FILE */
1056 if ((f = _http_funopen(conn, chunked)) == NULL) {
1057 _fetch_syserr();
1058 goto ouch;
1059 }
1060
1061 if (url != URL)
1062 fetchFreeURL(url);
1063 if (purl)
1064 fetchFreeURL(purl);
1065
1066 if (HTTP_ERROR(conn->err)) {
1067 _http_print_html(stderr, f);
1068 fclose(f);
1069 f = NULL;
1070 }
1071
1072 return (f);
1073
1074ouch:
1075 if (url != URL)
1076 fetchFreeURL(url);
1077 if (purl)
1078 fetchFreeURL(purl);
1079 if (conn != NULL)
1080 _fetch_close(conn);
1081 return (NULL);
1082}
1083
1084
1085/*****************************************************************************
1086 * Entry points
1087 */
1088
1089/*
1090 * Retrieve and stat a file by HTTP
1091 */
1092FILE *
1093fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags)
1094{
1095 return (_http_request(URL, "GET", us, _http_get_proxy(), flags));
1096}
1097
1098/*
1099 * Retrieve a file by HTTP
1100 */
1101FILE *
1102fetchGetHTTP(struct url *URL, const char *flags)
1103{
1104 return (fetchXGetHTTP(URL, NULL, flags));
1105}
1106
1107/*
1108 * Store a file by HTTP
1109 */
1110FILE *
1111fetchPutHTTP(struct url *URL __unused, const char *flags __unused)
1112{
1113 warnx("fetchPutHTTP(): not implemented");
1114 return (NULL);
1115}
1116
1117/*
1118 * Get an HTTP document's metadata
1119 */
1120int
1121fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags)
1122{
1123 FILE *f;
1124
1125 if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL)
1126 return (-1);
1127 fclose(f);
1128 return (0);
1129}
1130
1131/*
1132 * List a directory
1133 */
1134struct url_ent *
1135fetchListHTTP(struct url *url __unused, const char *flags __unused)
1136{
1137 warnx("fetchListHTTP(): not implemented");
1138 return (NULL);
1139}
|