httpp.c 13.2 KB
Newer Older
Jack Moffitt's avatar
Jack Moffitt committed
1
2
3
4
5
/* Httpp.c
**
** http parsing engine
*/

6
7
8
9
#ifdef HAVE_CONFIG_H
 #include <config.h>
#endif

Michael Smith's avatar
Michael Smith committed
10
11
#include <stdio.h>

Jack Moffitt's avatar
Jack Moffitt committed
12
13
14
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
15
16
17
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
Jack Moffitt's avatar
Jack Moffitt committed
18

19
#include <avl/avl.h>
Jack Moffitt's avatar
Jack Moffitt committed
20
21
#include "httpp.h"

22
23
24
25
#ifdef _WIN32
#define strcasecmp stricmp
#endif

Michael Smith's avatar
Michael Smith committed
26
27
#define MAX_HEADERS 32

Jack Moffitt's avatar
Jack Moffitt committed
28
29
30
/* internal functions */

/* misc */
31
static char *_lowercase(char *str);
Jack Moffitt's avatar
Jack Moffitt committed
32
33
34
35
36
37
38

/* for avl trees */
int _compare_vars(void *compare_arg, void *a, void *b);
int _free_vars(void *key);

http_parser_t *httpp_create_parser(void)
{
39
    return (http_parser_t *)malloc(sizeof(http_parser_t));
Jack Moffitt's avatar
Jack Moffitt committed
40
41
42
43
}

void httpp_initialize(http_parser_t *parser, http_varlist_t *defaults)
{
44
45
46
47
48
49
50
51
52
53
54
55
56
    http_varlist_t *list;

    parser->req_type = httpp_req_none;
    parser->uri = NULL;
    parser->vars = avl_tree_new(_compare_vars, NULL);
    parser->queryvars = avl_tree_new(_compare_vars, NULL);

    /* now insert the default variables */
    list = defaults;
    while (list != NULL) {
        httpp_setvar(parser, list->var.name, list->var.value);
        list = list->next;
    }
Jack Moffitt's avatar
Jack Moffitt committed
57
58
}

59
static int split_headers(char *data, unsigned long len, char **line)
Jack Moffitt's avatar
Jack Moffitt committed
60
{
61
62
63
64
    /* first we count how many lines there are 
    ** and set up the line[] array     
    */
    int lines = 0;
Michael Smith's avatar
Michael Smith committed
65
    unsigned long i;
66
67
68
69
70
71
72
73
74
75
76
    line[lines] = data;
    for (i = 0; i < len && lines < MAX_HEADERS; i++) {
        if (data[i] == '\r')
            data[i] = '\0';
        if (data[i] == '\n') {
            lines++;
            data[i] = '\0';
            if (i + 1 < len) {
                if (data[i + 1] == '\n' || data[i + 1] == '\r')
                    break;
                line[lines] = &data[i + 1];
Michael Smith's avatar
Michael Smith committed
77
            }
78
79
        }
    }
Jack Moffitt's avatar
Jack Moffitt committed
80

81
82
    i++;
    while (data[i] == '\n') i++;
83
84
85
86
87
88
89

    return lines;
}

static void parse_headers(http_parser_t *parser, char **line, int lines)
{
    int i,l;
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
    int whitespace, where, slen;
    char *name = NULL;
    char *value = NULL;

    /* parse the name: value lines. */
    for (l = 1; l < lines; l++) {
        where = 0;
        whitespace = 0;
        name = line[l];
        value = NULL;
        slen = strlen(line[l]);
        for (i = 0; i < slen; i++) {
            if (line[l][i] == ':') {
                whitespace = 1;
                line[l][i] = '\0';
            } else {
                if (whitespace) {
                    whitespace = 0;
                    while (i < slen && line[l][i] == ' ')
                        i++;

                    if (i < slen)
                        value = &line[l][i];
                    
                    break;
                }
            }
        }
        
        if (name != NULL && value != NULL) {
            httpp_setvar(parser, _lowercase(name), value);
            name = NULL; 
            value = NULL;
        }
    }
125
126
127
128
}

int httpp_parse_response(http_parser_t *parser, char *http_data, unsigned long len, char *uri)
{
129
130
131
132
    char *data;
    char *line[MAX_HEADERS];
    int lines, slen,i, whitespace=0, where=0,code;
    char *version=NULL, *resp_code=NULL, *message=NULL;
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
    if(http_data == NULL)
        return 0;

    /* make a local copy of the data, including 0 terminator */
    data = (char *)malloc(len+1);
    if (data == NULL) return 0;
    memcpy(data, http_data, len);
    data[len] = 0;

    lines = split_headers(data, len, line);

    /* In this case, the first line contains:
     * VERSION RESPONSE_CODE MESSAGE, such as HTTP/1.0 200 OK
     */
    slen = strlen(line[0]);
    version = line[0];
    for(i=0; i < slen; i++) {
        if(line[0][i] == ' ') {
            line[0][i] = 0;
            whitespace = 1;
        } else if(whitespace) {
            whitespace = 0;
            where++;
            if(where == 1)
                resp_code = &line[0][i];
            else {
                message = &line[0][i];
                break;
            }
        }
    }

    if(version == NULL || resp_code == NULL || message == NULL) {
        free(data);
        return 0;
    }

    httpp_setvar(parser, HTTPP_VAR_ERROR_CODE, resp_code);
    code = atoi(resp_code);
    if(code < 200 || code >= 300) {
        httpp_setvar(parser, HTTPP_VAR_ERROR_MESSAGE, message);
    }

    httpp_setvar(parser, HTTPP_VAR_URI, uri);
    httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "NONE");

    parse_headers(parser, line, lines);

    free(data);

    return 1;
185
186
}

187
188
static int hex(char c)
{
189
190
191
192
193
194
195
196
    if(c >= '0' && c <= '9')
        return c - '0';
    else if(c >= 'A' && c <= 'F')
        return c - 'A' + 10;
    else if(c >= 'a' && c <= 'f')
        return c - 'a' + 10;
    else
        return -1;
197
198
199
200
}

static char *url_escape(char *src)
{
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
    int len = strlen(src);
    unsigned char *decoded;
    int i;
    char *dst;
    int done = 0;

    decoded = calloc(1, len + 1);

    dst = decoded;

    for(i=0; i < len; i++) {
        switch(src[i]) {
        case '%':
            if(i+2 >= len) {
                free(decoded);
                return NULL;
            }
            if(hex(src[i+1]) == -1 || hex(src[i+2]) == -1 ) {
                free(decoded);
                return NULL;
            }

            *dst++ = hex(src[i+1]) * 16  + hex(src[i+2]);
            i+= 2;
            break;
        case '#':
            done = 1;
            break;
        case 0:
            free(decoded);
            return NULL;
            break;
        default:
            *dst++ = src[i];
            break;
        }
        if(done)
            break;
    }

    *dst = 0; /* null terminator */

    return decoded;
244
245
246
247
248
}

/** TODO: This is almost certainly buggy in some cases */
static void parse_query(http_parser_t *parser, char *query)
{
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
    int len;
    int i=0;
    char *key = query;
    char *val=NULL;

    if(!query || !*query)
        return;

    len = strlen(query);

    while(i<len) {
        switch(query[i]) {
        case '&':
            query[i] = 0;
            if(val && key)
                httpp_set_query_param(parser, key, val);
            key = query+i+1;
            break;
        case '=':
            query[i] = 0;
            val = query+i+1;
            break;
        }
        i++;
    }

    if(val && key) {
        httpp_set_query_param(parser, key, val);
    }
278
279
}

280
281
282
283
284
285
286
287
288
289
290
291
292
293
/* The old shoutcast procotol. Don't look at this, it's really nasty */
int httpp_parse_icy(http_parser_t *parser, char *http_data, unsigned long len)
{
    char *data;
    char *line[MAX_HEADERS];
    int lines;

    if(http_data == NULL)
        return 0;

    data = malloc(len + 1);
    memcpy(data, http_data, len);
    data[len] = 0;

294
    lines = split_headers(data, len, line);
295
296
297
298
299
300
301
302
303
304
305

    /* Now, this protocol looks like:
     * sourcepassword\n
     * headers: as normal\n"
     * \n
     */

    parser->req_type = httpp_req_source;
    httpp_setvar(parser, HTTPP_VAR_URI, "/");
    httpp_setvar(parser, HTTPP_VAR_ICYPASSWORD, line[0]);
    httpp_setvar(parser, HTTPP_VAR_PROTOCOL, "ICY");
306
    httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "SOURCE");
307
308
309
310
311
312
313
314
315
316
    /* This protocol is evil */
    httpp_setvar(parser, HTTPP_VAR_VERSION, "666");

    parse_headers(parser, line, lines);

    free(data);
    
    return 1;
}

317
318
int httpp_parse(http_parser_t *parser, char *http_data, unsigned long len)
{
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
    char *data, *tmp;
    char *line[MAX_HEADERS]; /* limited to 32 lines, should be more than enough */
    int i;
    int lines;
    char *req_type = NULL;
    char *uri = NULL;
    char *version = NULL;
    int whitespace, where, slen;

    if (http_data == NULL)
        return 0;

    /* make a local copy of the data, including 0 terminator */
    data = (char *)malloc(len+1);
    if (data == NULL) return 0;
    memcpy(data, http_data, len);
    data[len] = 0;

    lines = split_headers(data, len, line);

    /* parse the first line special
    ** the format is:
    ** REQ_TYPE URI VERSION
    ** eg:
    ** GET /index.html HTTP/1.0
    */
    where = 0;
    whitespace = 0;
    slen = strlen(line[0]);
    req_type = line[0];
    for (i = 0; i < slen; i++) {
        if (line[0][i] == ' ') {
            whitespace = 1;
            line[0][i] = '\0';
        } else {
            /* we're just past the whitespace boundry */
            if (whitespace) {
                whitespace = 0;
                where++;
                switch (where) {
                case 1:
                    uri = &line[0][i];
                    break;
                case 2:
                    version = &line[0][i];
                    break;
                }
            }
        }
    }

    if (strcasecmp("GET", req_type) == 0) {
        parser->req_type = httpp_req_get;
    } else if (strcasecmp("POST", req_type) == 0) {
        parser->req_type = httpp_req_post;
    } else if (strcasecmp("HEAD", req_type) == 0) {
        parser->req_type = httpp_req_head;
    } else if (strcasecmp("SOURCE", req_type) == 0) {
        parser->req_type = httpp_req_source;
    } else if (strcasecmp("PLAY", req_type) == 0) {
        parser->req_type = httpp_req_play;
    } else if (strcasecmp("STATS", req_type) == 0) {
        parser->req_type = httpp_req_stats;
    } else {
        parser->req_type = httpp_req_unknown;
    }

    if (uri != NULL && strlen(uri) > 0) {
        char *query;
        if((query = strchr(uri, '?')) != NULL) {
            *query = 0;
            query++;
            parse_query(parser, query);
        }

        parser->uri = strdup(uri);
    } else {
396
397
398
        free(data);
        return 0;
    }
Jack Moffitt's avatar
Jack Moffitt committed
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
    if ((version != NULL) && ((tmp = strchr(version, '/')) != NULL)) {
        tmp[0] = '\0';
        if ((strlen(version) > 0) && (strlen(&tmp[1]) > 0)) {
            httpp_setvar(parser, HTTPP_VAR_PROTOCOL, version);
            httpp_setvar(parser, HTTPP_VAR_VERSION, &tmp[1]);
        } else {
            free(data);
            return 0;
        }
    } else {
        free(data);
        return 0;
    }

    if (parser->req_type != httpp_req_none && parser->req_type != httpp_req_unknown) {
        switch (parser->req_type) {
        case httpp_req_get:
            httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "GET");
            break;
        case httpp_req_post:
            httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "POST");
            break;
        case httpp_req_head:
            httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "HEAD");
            break;
        case httpp_req_source:
            httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "SOURCE");
            break;
        case httpp_req_play:
            httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "PLAY");
            break;
        case httpp_req_stats:
            httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "STATS");
            break;
        default:
            break;
        }
    } else {
        free(data);
        return 0;
    }

    if (parser->uri != NULL) {
        httpp_setvar(parser, HTTPP_VAR_URI, parser->uri);
    } else {
        free(data);
        return 0;
    }

    parse_headers(parser, line, lines);

    free(data);

    return 1;
Jack Moffitt's avatar
Jack Moffitt committed
454
455
456
457
}

void httpp_setvar(http_parser_t *parser, char *name, char *value)
{
458
    http_var_t *var;
Jack Moffitt's avatar
Jack Moffitt committed
459

460
461
    if (name == NULL || value == NULL)
        return;
Jack Moffitt's avatar
Jack Moffitt committed
462

463
464
    var = (http_var_t *)malloc(sizeof(http_var_t));
    if (var == NULL) return;
Jack Moffitt's avatar
Jack Moffitt committed
465

466
467
    var->name = strdup(name);
    var->value = strdup(value);
Jack Moffitt's avatar
Jack Moffitt committed
468

469
470
471
472
473
474
    if (httpp_getvar(parser, name) == NULL) {
        avl_insert(parser->vars, (void *)var);
    } else {
        avl_delete(parser->vars, (void *)var, _free_vars);
        avl_insert(parser->vars, (void *)var);
    }
Jack Moffitt's avatar
Jack Moffitt committed
475
476
477
478
}

char *httpp_getvar(http_parser_t *parser, char *name)
{
479
480
    http_var_t var;
    http_var_t *found;
481
    void *fp;
Jack Moffitt's avatar
Jack Moffitt committed
482

483
    fp = &found;
484
485
    var.name = name;
    var.value = NULL;
Jack Moffitt's avatar
Jack Moffitt committed
486

487
    if (avl_get_by_key(parser->vars, &var, fp) == 0)
488
489
490
        return found->value;
    else
        return NULL;
Jack Moffitt's avatar
Jack Moffitt committed
491
492
}

493
494
void httpp_set_query_param(http_parser_t *parser, char *name, char *value)
{
495
    http_var_t *var;
496

497
498
    if (name == NULL || value == NULL)
        return;
499

500
501
    var = (http_var_t *)malloc(sizeof(http_var_t));
    if (var == NULL) return;
502

503
504
    var->name = strdup(name);
    var->value = url_escape(value);
505

506
507
508
509
510
511
    if (httpp_get_query_param(parser, name) == NULL) {
        avl_insert(parser->queryvars, (void *)var);
    } else {
        avl_delete(parser->queryvars, (void *)var, _free_vars);
        avl_insert(parser->queryvars, (void *)var);
    }
512
513
514
515
}

char *httpp_get_query_param(http_parser_t *parser, char *name)
{
516
517
    http_var_t var;
    http_var_t *found;
518
    void *fp;
519

520
    fp = &found;
521
522
    var.name = name;
    var.value = NULL;
523

524
    if (avl_get_by_key(parser->queryvars, (void *)&var, fp) == 0)
525
526
527
        return found->value;
    else
        return NULL;
528
529
}

530
void httpp_clear(http_parser_t *parser)
Jack Moffitt's avatar
Jack Moffitt committed
531
{
532
533
534
535
536
537
538
    parser->req_type = httpp_req_none;
    if (parser->uri)
        free(parser->uri);
    parser->uri = NULL;
    avl_tree_free(parser->vars, _free_vars);
    avl_tree_free(parser->queryvars, _free_vars);
    parser->vars = NULL;
Jack Moffitt's avatar
Jack Moffitt committed
539
540
}

541
542
void httpp_destroy(http_parser_t *parser)
{
543
544
    httpp_clear(parser);
    free(parser);
545
546
}

547
static char *_lowercase(char *str)
Jack Moffitt's avatar
Jack Moffitt committed
548
{
549
550
551
    char *p = str;
    for (; *p |= '\0'; p++)
        *p = tolower(*p);
Jack Moffitt's avatar
Jack Moffitt committed
552

553
    return str;
Jack Moffitt's avatar
Jack Moffitt committed
554
555
556
557
}

int _compare_vars(void *compare_arg, void *a, void *b)
{
558
    http_var_t *vara, *varb;
Jack Moffitt's avatar
Jack Moffitt committed
559

560
561
    vara = (http_var_t *)a;
    varb = (http_var_t *)b;
Jack Moffitt's avatar
Jack Moffitt committed
562

563
    return strcmp(vara->name, varb->name);
Jack Moffitt's avatar
Jack Moffitt committed
564
565
566
567
}

int _free_vars(void *key)
{
568
    http_var_t *var;
Jack Moffitt's avatar
Jack Moffitt committed
569

570
    var = (http_var_t *)key;
Jack Moffitt's avatar
Jack Moffitt committed
571

572
573
574
575
576
    if (var->name)
        free(var->name);
    if (var->value)
        free(var->value);
    free(var);
Jack Moffitt's avatar
Jack Moffitt committed
577

578
    return 1;
Jack Moffitt's avatar
Jack Moffitt committed
579
580
}