File: ne_uri.c

package info (click to toggle)
neon27 0.30.2-2
  • links: PTS
  • area: main
  • in suites: stretch
  • size: 4,940 kB
  • ctags: 3,303
  • sloc: ansic: 24,449; xml: 3,673; sh: 3,557; makefile: 595
file content (617 lines) | stat: -rw-r--r-- 17,577 bytes parent folder | download | duplicates (3)
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
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
/* 
   URI manipulation routines.
   Copyright (C) 1999-2006, Joe Orton <joe@manyfish.co.uk>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA

*/

#include "config.h"

#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#include <stdio.h>

#include <ctype.h>

#include "ne_string.h" /* for ne_buffer */
#include "ne_alloc.h"
#include "ne_uri.h"

/* URI ABNF from RFC 3986: */

#define PS (0x0001) /* "+" */
#define PC (0x0002) /* "%" */
#define DS (0x0004) /* "-" */
#define DT (0x0008) /* "." */
#define US (0x0010) /* "_" */
#define TD (0x0020) /* "~" */
#define FS (0x0040) /* "/" */
#define CL (0x0080) /* ":" */
#define AT (0x0100) /* "@" */
#define QU (0x0200) /* "?" */

#define DG (0x0400) /* DIGIT */
#define AL (0x0800) /* ALPHA */

#define GD (0x1000) /* gen-delims    = "#" / "[" / "]" 
                     * ... except ":", "/", "@", and "?" */

#define SD (0x2000) /* sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
                     *               / "*" / "+" / "," / ";" / "=" 
                     * ... except "+" which is PS */

#define OT (0x4000) /* others */

#define URI_ALPHA (AL)
#define URI_DIGIT (DG)

/* unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~" */
#define URI_UNRESERVED (AL | DG | DS | DT | US | TD)
/* scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) */
#define URI_SCHEME (AL | DG | PS | DS | DT)
/* real sub-delims definition, including "+" */
#define URI_SUBDELIM (PS | SD)
/* real gen-delims definition, including ":", "/", "@" and "?" */
#define URI_GENDELIM (GD | CL | FS | AT | QU)
/* userinfo = *( unreserved / pct-encoded / sub-delims / ":" ) */
#define URI_USERINFO (URI_UNRESERVED | PC | URI_SUBDELIM | CL)
/* pchar = unreserved / pct-encoded / sub-delims / ":" / "@" */
#define URI_PCHAR (URI_UNRESERVED | PC | URI_SUBDELIM | CL | AT)
/* invented: segchar = pchar / "/" */
#define URI_SEGCHAR (URI_PCHAR | FS)
/* query = *( pchar / "/" / "?" ) */
#define URI_QUERY (URI_PCHAR | FS | QU)
/* fragment == query */
#define URI_FRAGMENT URI_QUERY

/* any characters which should be path-escaped: */
#define URI_ESCAPE ((URI_GENDELIM & ~(FS)) | URI_SUBDELIM | OT | PC)

static const unsigned int uri_chars[256] = {
/* 0xXX    x0      x2      x4      x6      x8      xA      xC      xE     */
/*   0x */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT,
/*   1x */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT,
/*   2x */ OT, SD, OT, GD, SD, PC, SD, SD, SD, SD, SD, PS, SD, DS, DT, FS,
/*   3x */ DG, DG, DG, DG, DG, DG, DG, DG, DG, DG, CL, SD, OT, SD, OT, QU,
/*   4x */ AT, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL,
/*   5x */ AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, GD, OT, GD, OT, US,
/*   6x */ OT, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL,
/*   7x */ AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, OT, OT, OT, TD, OT,
/*   8x */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, 
/*   9x */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, 
/*   Ax */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, 
/*   Bx */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, 
/*   Cx */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, 
/*   Dx */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, 
/*   Ex */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, 
/*   Fx */ OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT, OT
};

#define uri_lookup(ch) (uri_chars[(unsigned char)ch])

char *ne_path_parent(const char *uri) 
{
    size_t len = strlen(uri);
    const char *pnt = uri + len - 1;
    /* skip trailing slash (parent of "/foo/" is "/") */
    if (pnt >= uri && *pnt == '/')
	pnt--;
    /* find previous slash */
    while (pnt > uri && *pnt != '/')
	pnt--;
    if (pnt < uri || (pnt == uri && *pnt != '/'))
	return NULL;
    return ne_strndup(uri, pnt - uri + 1);
}

int ne_path_has_trailing_slash(const char *uri) 
{
    size_t len = strlen(uri);
    return ((len > 0) &&
	    (uri[len-1] == '/'));
}

unsigned int ne_uri_defaultport(const char *scheme)
{
    /* RFC2616/3.2.3 says use case-insensitive comparisons here. */
    if (ne_strcasecmp(scheme, "http") == 0)
	return 80;
    else if (ne_strcasecmp(scheme, "https") == 0)
	return 443;
    else
	return 0;
}

int ne_uri_parse(const char *uri, ne_uri *parsed)
{
    const char *p, *s;

    memset(parsed, 0, sizeof *parsed);

    p = s = uri;

    /* => s = p = URI-reference */

    if (uri_lookup(*p) & URI_ALPHA) {
        while (uri_lookup(*p) & URI_SCHEME)
            p++;
        
        if (*p == ':') {
            parsed->scheme = ne_strndup(uri, p - s);
            s = p + 1;
        }
    }

    /* => s = heir-part, or s = relative-part */

    if (s[0] == '/' && s[1] == '/') {
        const char *pa;

        /* => s = "//" authority path-abempty (from expansion of
         * either heir-part of relative-part)  */
        
        /* authority = [ userinfo "@" ] host [ ":" port ] */

        s = pa = s + 2; /* => s = authority */

        while (*pa != '/' && *pa != '\0')
            pa++;
        /* => pa = path-abempty */
        
        p = s;
        while (p < pa && uri_lookup(*p) & URI_USERINFO)
            p++;

        if (*p == '@') {
            parsed->userinfo = ne_strndup(s, p - s);
            s = p + 1;
        }
        /* => s = host */

        if (s[0] == '[') {
            p = s + 1;

            while (*p != ']' && p < pa)
                p++;

            if (p == pa || (p + 1 != pa && p[1] != ':')) {
                /* Ill-formed IP-literal. */
                return -1;
            }

            p++; /* => p = colon */
        } else {
            /* Find the colon. */
            p = pa;
            while (*p != ':' && p > s)
                p--;
        }

        if (p == s) {
            p = pa;
            /* No colon; => p = path-abempty */
        } else if (p + 1 != pa) {
            /* => p = colon */
            parsed->port = atoi(p + 1);
        }
        parsed->host = ne_strndup(s, p - s);
        
        s = pa;        

        if (*s == '\0') {
            s = "/"; /* FIXME: scheme-specific. */
        }
    }

    /* => s = path-abempty / path-absolute / path-rootless
     *      / path-empty / path-noscheme */

    p = s;

    while (uri_lookup(*p) & URI_SEGCHAR)
        p++;

    /* => p = [ "?" query ] [ "#" fragment ] */

    parsed->path = ne_strndup(s, p - s);

    if (*p != '\0') {
        s = p++;

        while (uri_lookup(*p) & URI_QUERY)
            p++;

        /* => p = [ "#" fragment ] */
        /* => s = [ "?" query ] [ "#" fragment ] */

        if (*s == '?') {
            parsed->query = ne_strndup(s + 1, p - s - 1);
            
            if (*p != '\0') {
                s = p++;

                while (uri_lookup(*p) & URI_FRAGMENT)
                    p++;
            }
        }

        /* => p now points to the next character after the
         * URI-reference; which should be the NUL byte. */

        if (*s == '#') {
            parsed->fragment = ne_strndup(s + 1, p - s - 1);
        }
        else if (*p || *s != '?') {
            return -1;
        }
    }
    
    return 0;
}

/* This function directly implements the "Merge Paths" algorithm
 * described in RFC 3986 section 5.2.3. */
static char *merge_paths(const ne_uri *base, const char *path)
{
    const char *p;

    if (base->host && base->path[0] == '\0') {
        return ne_concat("/", path, NULL);
    }
    
    p = strrchr(base->path, '/');
    if (p == NULL) {
        return ne_strdup(path);
    } else {
        size_t len = p - base->path + 1;
        char *ret = ne_malloc(strlen(path) + len + 1);

        memcpy(ret, base->path, len);
        memcpy(ret + len, path, strlen(path) + 1);
        return ret;
    }
}

/* This function directly implements the "Remove Dot Segments"
 * algorithm described in RFC 3986 section 5.2.4. */
static char *remove_dot_segments(const char *path)
{
    char *in, *inc, *out;

    inc = in = ne_strdup(path);
    out = ne_malloc(strlen(path) + 1);
    out[0] = '\0';

    while (in[0]) {
        /* case 2.A: */
        if (strncmp(in, "./", 2) == 0) {
            in += 2;
        } 
        else if (strncmp(in, "../", 3) == 0) {
            in += 3;
        }

        /* case 2.B: */
        else if (strncmp(in, "/./", 3) == 0) {
            in += 2;
        }
        else if (strcmp(in, "/.") == 0) {
            in[1] = '\0';
        }

        /* case 2.C: */
        else if (strncmp(in, "/../", 4) == 0 || strcmp(in, "/..") == 0) {
            char *p;

            /* Make the next character in the input buffer a "/": */
            if (in[3] == '\0') {
                /* terminating "/.." case */
                in += 2;
                in[0] = '/';
            } else {
                /* "/../" prefix case */
                in += 3;
            }

            /* Trim the last component from the output buffer, or
             * empty it. */
            p = strrchr(out, '/');
            if (p) {
                *p = '\0';
            } else {
                out[0] = '\0';
            }
        }

        /* case 2.D: */
        else if (strcmp(in, ".") == 0 || strcmp(in, "..") == 0) {
            in[0] = '\0';
        }

        /* case 2.E */
        else {
            char *p;

            /* Search for the *second* "/" if the leading character is
             * already "/": */
            p = strchr(in + (in[0] == '/'), '/');
            /* Otherwise, copy the whole string */
            if (p == NULL) p = strchr(in, '\0');

            strncat(out, in, p - in);
            in = p;
        }
    }

    ne_free(inc);

    return out;
}

/* Copy authority components from 'src' to 'dest' if defined. */
static void copy_authority(ne_uri *dest, const ne_uri *src)
{
    if (src->host) dest->host = ne_strdup(src->host);
    dest->port = src->port;
    if (src->userinfo) dest->userinfo = ne_strdup(src->userinfo);
}

/* This function directly implements the "Transform References"
 * algorithm described in RFC 3986 section 5.2.2. */
ne_uri *ne_uri_resolve(const ne_uri *base, const ne_uri *relative,
                       ne_uri *target)
{
    memset(target, 0, sizeof *target);

    if (relative->scheme) {
        target->scheme = ne_strdup(relative->scheme);
        copy_authority(target, relative);
        target->path = remove_dot_segments(relative->path);
        if (relative->query) target->query = ne_strdup(relative->query);
    } else {
        if (relative->host) {
            copy_authority(target, relative);
            target->path = remove_dot_segments(relative->path);
            if (relative->query) target->query = ne_strdup(relative->query);
        } else {
            if (relative->path[0] == '\0') {
                target->path = ne_strdup(base->path);
                if (relative->query) {
                    target->query = ne_strdup(relative->query);
                } else if (base->query) {
                    target->query = ne_strdup(base->query);
                }
            } else {
                if (relative->path[0] == '/') {
                    target->path = remove_dot_segments(relative->path);
                } else {
                    char *merged = merge_paths(base, relative->path);
                    target->path = remove_dot_segments(merged);
                    ne_free(merged);
                }
                if (relative->query) target->query = ne_strdup(relative->query);
            }
            copy_authority(target, base);
        }
        if (base->scheme) target->scheme = ne_strdup(base->scheme);
    }
    
    if (relative->fragment) target->fragment = ne_strdup(relative->fragment);

    return target;
}

ne_uri *ne_uri_copy(ne_uri *dest, const ne_uri *src)
{
    memset(dest, 0, sizeof *dest);

    if (src->scheme) dest->scheme = ne_strdup(src->scheme);
    copy_authority(dest, src);
    if (src->path) dest->path = ne_strdup(src->path);
    if (src->query) dest->query = ne_strdup(src->query);
    if (src->fragment) dest->fragment = ne_strdup(src->fragment);

    return dest;
}

void ne_uri_free(ne_uri *u)
{
    if (u->host) ne_free(u->host);
    if (u->path) ne_free(u->path);
    if (u->scheme) ne_free(u->scheme);
    if (u->userinfo) ne_free(u->userinfo);
    if (u->fragment) ne_free(u->fragment);
    if (u->query) ne_free(u->query);
    memset(u, 0, sizeof *u);
}

char *ne_path_unescape(const char *uri) 
{
    const char *pnt;
    char *ret, *retpos, buf[5] = { "0x00" };
    retpos = ret = ne_malloc(strlen(uri) + 1);
    for (pnt = uri; *pnt != '\0'; pnt++) {
	if (*pnt == '%') {
	    if (!isxdigit((unsigned char) pnt[1]) || 
		!isxdigit((unsigned char) pnt[2])) {
		/* Invalid URI */
                ne_free(ret);
		return NULL;
	    }
	    buf[2] = *++pnt; buf[3] = *++pnt; /* bit faster than memcpy */
	    *retpos++ = (char)strtol(buf, NULL, 16);
	} else {
	    *retpos++ = *pnt;
	}
    }
    *retpos = '\0';
    return ret;
}

/* CH must be an unsigned char; evaluates to 1 if CH should be
 * percent-encoded (note !!x == x ? 1 : 0). */
#define path_escape_ch(ch) (!!(uri_lookup(ch) & URI_ESCAPE))

char *ne_path_escape(const char *path) 
{
    const unsigned char *pnt;
    char *ret, *p;
    size_t count = 0;

    for (pnt = (const unsigned char *)path; *pnt != '\0'; pnt++) {
        count += path_escape_ch(*pnt);
    }

    if (count == 0) {
	return ne_strdup(path);
    }

    p = ret = ne_malloc(strlen(path) + 2 * count + 1);
    for (pnt = (const unsigned char *)path; *pnt != '\0'; pnt++) {
	if (path_escape_ch(*pnt)) {
	    /* Escape it - %<hex><hex> */
	    sprintf(p, "%%%02x", (unsigned char) *pnt);
	    p += 3;
	} else {
	    *p++ = *pnt;
	}
    }
    *p = '\0';
    return ret;
}

#undef path_escape_ch

#define CMPWITH(field, func)                    \
    do {                                        \
        if (u1->field) {                        \
            if (!u2->field) return -1;          \
            n = func(u1->field, u2->field);     \
            if (n) return n;                    \
        } else if (u2->field) {                 \
            return 1;                           \
        }                                       \
    } while (0)

#define CMP(field) CMPWITH(field, strcmp)
#define CASECMP(field) CMPWITH(field, ne_strcasecmp)

/* As specified by RFC 2616, section 3.2.3. */
int ne_uri_cmp(const ne_uri *u1, const ne_uri *u2)
{
    int n;
    
    CMP(path);
    CASECMP(host);
    CASECMP(scheme);
    CMP(query);
    CMP(fragment);
    CMP(userinfo);

    return u2->port - u1->port;
}

#undef CMP
#undef CASECMP
#undef CMPWITH

/* TODO: implement properly */
int ne_path_compare(const char *a, const char *b) 
{
    int ret = ne_strcasecmp(a, b);
    if (ret) {
	/* This logic says: "If the lengths of the two URIs differ by
	 * exactly one, and the LONGER of the two URIs has a trailing
	 * slash and the SHORTER one DOESN'T, then..." */
	int traila = ne_path_has_trailing_slash(a),
	    trailb = ne_path_has_trailing_slash(b),
	    lena = strlen(a), lenb = strlen(b);
	if (traila != trailb && abs(lena - lenb) == 1 &&
	    ((traila && lena > lenb) || (trailb && lenb > lena))) {
	    /* Compare them, ignoring the trailing slash on the longer
	     * URI */
	    if (strncasecmp(a, b, lena < lenb ? lena : lenb) == 0)
		ret = 0;
	}
    }
    return ret;
}

char *ne_uri_unparse(const ne_uri *uri)
{
    ne_buffer *buf = ne_buffer_create();

    if (uri->scheme) {
        ne_buffer_concat(buf, uri->scheme, ":", NULL);
    }

    if (uri->host) {
        ne_buffer_czappend(buf, "//");
        if (uri->userinfo) {
            ne_buffer_concat(buf, uri->userinfo, "@", NULL);
        }
        ne_buffer_zappend(buf, uri->host);
        
        if (uri->port > 0
            && (!uri->scheme 
                || ne_uri_defaultport(uri->scheme) != uri->port)) {
            char str[20];
            ne_snprintf(str, 20, ":%d", uri->port);
            ne_buffer_zappend(buf, str);
        }
    }

    ne_buffer_zappend(buf, uri->path);

    if (uri->query) {
        ne_buffer_concat(buf, "?", uri->query, NULL);
    }
    
    if (uri->fragment) {
        ne_buffer_concat(buf, "#", uri->fragment, NULL);
    }

    return ne_buffer_finish(buf);
}

/* Give it a path segment, it returns non-zero if child is 
 * a child of parent. */
int ne_path_childof(const char *parent, const char *child) 
{
    char *root = ne_strdup(child);
    int ret;
    if (strlen(parent) >= strlen(child)) {
	ret = 0;
    } else {
	/* root is the first of child, equal to length of parent */
	root[strlen(parent)] = '\0';
	ret = (ne_path_compare(parent, root) == 0);
    }
    ne_free(root);
    return ret;
}