1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
|
/*-
* Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: http.c,v 1.6 1998/11/05 19:48:17 des Exp $
*/
/*
* The base64 code in this file is based on code from MIT fetch, which
* has the following copyright and license:
*
*-
* Copyright 1997 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. */
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <err.h>
#include <ctype.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "fetch.h"
#include "common.h"
#include "httperr.inc"
#ifndef NDEBUG
#define DEBUG(x) do x; while (0)
#else
#define DEBUG(x) do { } while (0)
#endif
extern char *__progname;
#define ENDL "\r\n"
struct cookie
{
FILE *real_f;
#define ENC_NONE 0
#define ENC_CHUNKED 1
int encoding; /* 1 = chunked, 0 = none */
#define HTTPCTYPELEN 59
char content_type[HTTPCTYPELEN+1];
char *buf;
int b_cur, eof;
unsigned b_len, chunksize;
};
/*
* Send a formatted line; optionally echo to terminal
*/
static int
_http_cmd(FILE *f, char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(f, fmt, ap);
#ifndef NDEBUG
fprintf(stderr, "\033[1m>>> ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\033[m");
#endif
va_end(ap);
return 0; /* XXX */
}
/*
* Fill the input buffer, do chunk decoding on the fly
*/
static char *
_http_fillbuf(struct cookie *c)
{
char *ln;
unsigned int len;
if (c->eof)
return NULL;
if (c->encoding == ENC_NONE) {
c->buf = fgetln(c->real_f, &(c->b_len));
c->b_cur = 0;
} else if (c->encoding == ENC_CHUNKED) {
if (c->chunksize == 0) {
ln = fgetln(c->real_f, &len);
DEBUG(fprintf(stderr, "\033[1m_http_fillbuf(): new chunk: "
"%*.*s\033[m\n", (int)len-2, (int)len-2, ln));
sscanf(ln, "%x", &(c->chunksize));
if (!c->chunksize) {
DEBUG(fprintf(stderr, "\033[1m_http_fillbuf(): "
"end of last chunk\033[m\n"));
c->eof = 1;
return NULL;
}
DEBUG(fprintf(stderr, "\033[1m_http_fillbuf(): "
"new chunk: %X\033[m\n", c->chunksize));
}
c->buf = fgetln(c->real_f, &(c->b_len));
if (c->b_len > c->chunksize)
c->b_len = c->chunksize;
c->chunksize -= c->b_len;
c->b_cur = 0;
}
else return NULL; /* unknown encoding */
return c->buf;
}
/*
* Read function
*/
static int
_http_readfn(struct cookie *c, char *buf, int len)
{
int l, pos = 0;
while (len) {
/* empty buffer */
if (!c->buf || (c->b_cur == c->b_len))
if (!_http_fillbuf(c))
break;
l = c->b_len - c->b_cur;
if (len < l) l = len;
memcpy(buf + pos, c->buf + c->b_cur, l);
c->b_cur += l;
pos += l;
len -= l;
}
if (ferror(c->real_f))
return -1;
else return pos;
}
/*
* Write function
*/
static int
_http_writefn(struct cookie *c, const char *buf, int len)
{
size_t r = fwrite(buf, 1, (size_t)len, c->real_f);
return r ? r : -1;
}
/*
* Close function
*/
static int
_http_closefn(struct cookie *c)
{
int r = fclose(c->real_f);
free(c);
return (r == EOF) ? -1 : 0;
}
/*
* Extract content type from cookie
*/
char *
fetchContentType(FILE *f)
{
/*
* We have no way of making sure this really *is* one of our cookies,
* so just check for a null pointer and hope for the best.
*/
return f->_cookie ? (((struct cookie *)f->_cookie)->content_type) : NULL;
}
/*
* Base64 encoding
*/
int
_http_base64(char *dst, char *src, int l)
{
static const char base64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
int t, r = 0;
while (l >= 3) {
t = (src[0] << 16) | (src[1] << 8) | src[2];
dst[0] = base64[(t >> 18) & 0x3f];
dst[1] = base64[(t >> 12) & 0x3f];
dst[2] = base64[(t >> 6) & 0x3f];
dst[3] = base64[(t >> 0) & 0x3f];
src += 3; l -= 3;
dst += 4; r += 4;
}
switch (l) {
case 2:
t = (src[0] << 16) | (src[1] << 8);
dst[0] = base64[(t >> 18) & 0x3f];
dst[1] = base64[(t >> 12) & 0x3f];
dst[2] = base64[(t >> 6) & 0x3f];
dst[3] = '=';
dst += 4;
r += 4;
break;
case 1:
t = src[0] << 16;
dst[0] = base64[(t >> 18) & 0x3f];
dst[1] = base64[(t >> 12) & 0x3f];
dst[2] = dst[3] = '=';
dst += 4;
r += 4;
break;
case 0:
break;
}
*dst = 0;
return r;
}
/*
* Encode username and password
*/
char *
_http_auth(char *usr, char *pwd)
{
int len, lu, lp;
char *str, *s;
lu = strlen(usr);
lp = strlen(pwd);
len = (lu * 4 + 2) / 3 /* user name, round up */
+ 1 /* colon */
+ (lp * 4 + 2) / 3 /* password, round up */
+ 1; /* null */
if ((s = str = (char *)malloc(len)) == NULL)
return NULL;
s += _http_base64(s, usr, lu);
*s++ = ':';
s += _http_base64(s, pwd, lp);
*s = 0;
return str;
}
/*
* Retrieve a file by HTTP
*/
FILE *
fetchGetHTTP(struct url *URL, char *flags)
{
int sd = -1, err, i, enc = ENC_NONE;
struct cookie *c;
char *ln, *p, *q;
FILE *f, *cf;
size_t len;
/* allocate cookie */
if ((c = calloc(1, sizeof(struct cookie))) == NULL)
return NULL;
/* check port */
if (!URL->port)
URL->port = 80; /* default HTTP port */
/* attempt to connect to proxy server */
if (getenv("HTTP_PROXY")) {
char *px, host[MAXHOSTNAMELEN];
int port = 3128; /* XXX I think 3128 is default... check? */
size_t len;
/* measure length */
px = getenv("HTTP_PROXY");
len = strcspn(px, ":");
/* get port (atoi is a little too tolerant perhaps?) */
if (px[len] == ':')
port = atoi(px+len+1);
/* get host name */
if (len >= MAXHOSTNAMELEN)
len = MAXHOSTNAMELEN - 1;
strncpy(host, px, len);
host[len] = 0;
/* connect */
sd = fetchConnect(host, port);
}
/* if no proxy is configured or could be contacted, try direct */
if (sd == -1) {
if ((sd = fetchConnect(URL->host, URL->port)) == -1)
goto ouch;
}
/* reopen as stream */
if ((f = fdopen(sd, "r+")) == NULL)
goto ouch;
c->real_f = f;
/* send request (proxies require absolute form, so use that) */
_http_cmd(f, "GET http://%s:%d%s HTTP/1.1" ENDL,
URL->host, URL->port, URL->doc);
/* start sending headers away */
if (URL->user[0] || URL->pwd[0]) {
char *auth_str = _http_auth(URL->user, URL->pwd);
if (!auth_str)
goto fouch;
_http_cmd(f, "Authorization: Basic %s" ENDL, auth_str);
free(auth_str);
}
_http_cmd(f, "Host: %s:%d" ENDL, URL->host, URL->port);
_http_cmd(f, "User-Agent: %s " _LIBFETCH_VER ENDL, __progname);
_http_cmd(f, "Connection: close" ENDL ENDL);
/* get response */
if ((ln = fgetln(f, &len)) == NULL)
goto fouch;
DEBUG(fprintf(stderr, "response: [\033[1m%*.*s\033[m]\n",
(int)len-2, (int)len-2, ln));
/* we can't use strchr() and friends since ln isn't NUL-terminated */
p = ln;
while ((p < ln + len) && !isspace(*p))
p++;
while ((p < ln + len) && !isdigit(*p))
p++;
if (!isdigit(*p))
goto fouch;
err = atoi(p);
DEBUG(fprintf(stderr, "code: [\033[1m%d\033[m]\n", err));
/* add code to handle redirects later */
if (err != 200) {
_http_seterr(err);
goto fouch;
}
/* browse through header */
while (1) {
if ((ln = fgetln(f, &len)) == NULL)
goto fouch;
if ((ln[0] == '\r') || (ln[0] == '\n'))
break;
DEBUG(fprintf(stderr, "header: [\033[1m%*.*s\033[m]\n",
(int)len-2, (int)len-2, ln));
#define XFERENC "Transfer-Encoding:"
if (strncasecmp(ln, XFERENC, sizeof(XFERENC)-1) == 0) {
p = ln + sizeof(XFERENC) - 1;
while ((p < ln + len) && isspace(*p))
p++;
for (q = p; (q < ln + len) && !isspace(*q); q++)
/* VOID */ ;
*q = 0;
if (strcasecmp(p, "chunked") == 0)
enc = ENC_CHUNKED;
DEBUG(fprintf(stderr, "xferenc: [\033[1m%s\033[m]\n", p));
#undef XFERENC
#define CONTTYPE "Content-Type:"
} else if (strncasecmp(ln, CONTTYPE, sizeof(CONTTYPE)-1) == 0) {
p = ln + sizeof(CONTTYPE) - 1;
while ((p < ln + len) && isspace(*p))
p++;
for (i = 0; p < ln + len; p++)
if (i < HTTPCTYPELEN)
c->content_type[i++] = *p;
do c->content_type[i--] = 0; while (isspace(c->content_type[i]));
DEBUG(fprintf(stderr, "conttype: [\033[1m%s\033[m]\n",
c->content_type));
#undef CONTTYPE
}
}
/* only body remains */
c->encoding = enc;
cf = funopen(c,
(int (*)(void *, char *, int))_http_readfn,
(int (*)(void *, const char *, int))_http_writefn,
(fpos_t (*)(void *, fpos_t, int))NULL,
(int (*)(void *))_http_closefn);
if (cf == NULL)
goto fouch;
return cf;
ouch:
if (sd >= 0)
close(sd);
free(c);
return NULL;
fouch:
fclose(f);
free(c);
return NULL;
}
FILE *
fetchPutHTTP(struct url *URL, char *flags)
{
warnx("fetchPutHTTP(): not implemented");
return NULL;
}
/*
* Get an HTTP document's metadata
*/
int
fetchStatHTTP(struct url *url, struct url_stat *us, char *flags)
{
warnx("fetchStatHTTP(): not implemented");
return -1;
}
|