httpp.c 10.9 KB
Newer Older
Jack Moffitt's avatar
Jack Moffitt committed
1 2 3 4 5
/* Httpp.c
**
** http parsing engine
*/

Michael Smith's avatar
Michael Smith committed
6 7
#include <stdio.h>

Jack Moffitt's avatar
Jack Moffitt committed
8 9 10 11 12 13 14
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "avl.h"
#include "httpp.h"

15 16 17 18
#ifdef _WIN32
#define strcasecmp stricmp
#endif

Michael Smith's avatar
Michael Smith committed
19 20
#define MAX_HEADERS 32

Jack Moffitt's avatar
Jack Moffitt committed
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
/* internal functions */

/* misc */
char *_lowercase(char *str);

/* 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)
{
	return (http_parser_t *)malloc(sizeof(http_parser_t));
}

void httpp_initialize(http_parser_t *parser, http_varlist_t *defaults)
{
	http_varlist_t *list;

	parser->req_type = httpp_req_none;
	parser->uri = NULL;
	parser->vars = avl_tree_new(_compare_vars, NULL);
42
	parser->queryvars = avl_tree_new(_compare_vars, NULL);
Jack Moffitt's avatar
Jack Moffitt committed
43 44 45 46 47 48 49 50 51

	/* now insert the default variables */
	list = defaults;
	while (list != NULL) {
		httpp_setvar(parser, list->var.name, list->var.value);
		list = list->next;
	}
}

52
static int split_headers(char *data, unsigned long len, char **line)
Jack Moffitt's avatar
Jack Moffitt committed
53 54 55 56
{
	/* first we count how many lines there are 
	** and set up the line[] array	 
	*/
Michael Smith's avatar
Michael Smith committed
57 58
	int lines = 0;
    unsigned long i;
Jack Moffitt's avatar
Jack Moffitt committed
59
	line[lines] = data;
Michael Smith's avatar
Michael Smith committed
60
	for (i = 0; i < len && lines < MAX_HEADERS; i++) {
Jack Moffitt's avatar
Jack Moffitt committed
61 62 63 64 65
		if (data[i] == '\r')
			data[i] = '\0';
		if (data[i] == '\n') {
			lines++;
			data[i] = '\0';
Michael Smith's avatar
Michael Smith committed
66 67 68
			if (i + 1 < len) {
				if (data[i + 1] == '\n' || data[i + 1] == '\r')
					break;
Jack Moffitt's avatar
Jack Moffitt committed
69
				line[lines] = &data[i + 1];
Michael Smith's avatar
Michael Smith committed
70
            }
Jack Moffitt's avatar
Jack Moffitt committed
71 72 73 74 75
		}
	}

	i++;
	while (data[i] == '\n') i++;
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

    return lines;
}

static void parse_headers(http_parser_t *parser, char **line, int lines)
{
    int i,l;
	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;
		}
	}
}

int httpp_parse_response(http_parser_t *parser, char *http_data, unsigned long len, char *uri)
{
122 123 124 125
	char *data;
	char *line[MAX_HEADERS];
	int lines, slen,i, whitespace=0, where=0,code;
	char *version=NULL, *resp_code=NULL, *message=NULL;
126
    
127 128
	if(http_data == NULL)
		return 0;
129 130 131 132 133

	/* 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);
134 135 136
	data[len] = 0;

	lines = split_headers(data, len, line);
137

138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
	/* 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;
			}
		}
	}
158

159 160 161 162
	if(version == NULL || resp_code == NULL || message == NULL) {
		free(data);
		return 0;
	}
163

164 165 166 167 168 169 170
	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);
171
	httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "NONE");
172

173
	parse_headers(parser, line, lines);
174 175 176 177 178 179

	free(data);

	return 1;
}

180 181
static int hex(char c)
{
182 183 184 185 186 187 188 189
	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;
190 191 192 193
}

static char *url_escape(char *src)
{
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
	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;
237 238 239 240 241
}

/** TODO: This is almost certainly buggy in some cases */
static void parse_query(http_parser_t *parser, char *query)
{
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
	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);
	}
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
/* 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;

	lines = split_headers(data, len, line);

    /* 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");
    /* This protocol is evil */
    httpp_setvar(parser, HTTPP_VAR_VERSION, "666");

    parse_headers(parser, line, lines);

    free(data);
    
    return 1;
}

309 310 311 312 313 314 315 316 317
int httpp_parse(http_parser_t *parser, char *http_data, unsigned long len)
{
	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;
318
	int whitespace, where, slen;
319 320 321 322 323 324 325 326

	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);
327
	data[len] = 0;
328

329
	lines = split_headers(data, len, line);
Jack Moffitt's avatar
Jack Moffitt committed
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

	/* 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;
	}

378 379 380 381 382 383 384
	if (uri != NULL && strlen(uri) > 0) {
		char *query;
		if((query = strchr(uri, '?')) != NULL) {
			*query = 0;
			query++;
			parse_query(parser, query);
		}
385

Jack Moffitt's avatar
Jack Moffitt committed
386
		parser->uri = strdup(uri);
387 388 389 390
	} else {
        free(data);
        return 0;
    }
Jack Moffitt's avatar
Jack Moffitt committed
391 392 393 394

	if ((version != NULL) && ((tmp = strchr(version, '/')) != NULL)) {
		tmp[0] = '\0';
		if ((strlen(version) > 0) && (strlen(&tmp[1]) > 0)) {
395
			httpp_setvar(parser, HTTPP_VAR_PROTOCOL, version);
Jack Moffitt's avatar
Jack Moffitt committed
396 397 398 399 400 401 402 403 404 405 406 407 408
			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:
409
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "GET");
Jack Moffitt's avatar
Jack Moffitt committed
410 411
			break;
		case httpp_req_post:
412
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "POST");
Jack Moffitt's avatar
Jack Moffitt committed
413 414
			break;
		case httpp_req_head:
415
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "HEAD");
Jack Moffitt's avatar
Jack Moffitt committed
416 417
			break;
		case httpp_req_source:
418
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "SOURCE");
Jack Moffitt's avatar
Jack Moffitt committed
419 420
			break;
		case httpp_req_play:
421
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "PLAY");
Jack Moffitt's avatar
Jack Moffitt committed
422 423
			break;
		case httpp_req_stats:
424
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "STATS");
Jack Moffitt's avatar
Jack Moffitt committed
425 426 427 428 429 430 431 432 433
			break;
		default:
			break;
		}
	} else {
		free(data);
		return 0;
	}

434
	if (parser->uri != NULL) {
Jack Moffitt's avatar
Jack Moffitt committed
435 436 437 438 439 440
		httpp_setvar(parser, HTTPP_VAR_URI, parser->uri);
	} else {
		free(data);
		return 0;
	}

441
	parse_headers(parser, line, lines);
Jack Moffitt's avatar
Jack Moffitt committed
442 443 444

	free(data);

445
	return 1;
Jack Moffitt's avatar
Jack Moffitt committed
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
}

void httpp_setvar(http_parser_t *parser, char *name, char *value)
{
	http_var_t *var;

	if (name == NULL || value == NULL)
		return;

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

	var->name = strdup(name);
	var->value = strdup(value);

	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);
	}
}

char *httpp_getvar(http_parser_t *parser, char *name)
{
	http_var_t var;
	http_var_t *found;

	var.name = name;
475
	var.value = NULL;
Jack Moffitt's avatar
Jack Moffitt committed
476 477 478 479 480 481 482

	if (avl_get_by_key(parser->vars, (void *)&var, (void **)&found) == 0)
		return found->value;
	else
		return NULL;
}

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
void httpp_set_query_param(http_parser_t *parser, char *name, char *value)
{
	http_var_t *var;

	if (name == NULL || value == NULL)
		return;

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

	var->name = strdup(name);
	var->value = url_escape(value);

	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);
	}
}

char *httpp_get_query_param(http_parser_t *parser, char *name)
{
	http_var_t var;
	http_var_t *found;

	var.name = name;
brendan's avatar
brendan committed
510
	var.value = NULL;
511 512 513 514 515 516 517

	if (avl_get_by_key(parser->queryvars, (void *)&var, (void **)&found) == 0)
		return found->value;
	else
		return NULL;
}

518
void httpp_clear(http_parser_t *parser)
Jack Moffitt's avatar
Jack Moffitt committed
519 520 521 522 523 524
{
	parser->req_type = httpp_req_none;
	if (parser->uri)
		free(parser->uri);
	parser->uri = NULL;
	avl_tree_free(parser->vars, _free_vars);
525
	avl_tree_free(parser->queryvars, _free_vars);
Jack Moffitt's avatar
Jack Moffitt committed
526 527 528
	parser->vars = NULL;
}

529 530
void httpp_destroy(http_parser_t *parser)
{
531 532
	httpp_clear(parser);
	free(parser);
533 534
}

Jack Moffitt's avatar
Jack Moffitt committed
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
char *_lowercase(char *str)
{
	long i;
	for (i = 0; i < strlen(str); i++)
		str[i] = tolower(str[i]);

	return str;
}

int _compare_vars(void *compare_arg, void *a, void *b)
{
	http_var_t *vara, *varb;

	vara = (http_var_t *)a;
	varb = (http_var_t *)b;

	return strcmp(vara->name, varb->name);
}

int _free_vars(void *key)
{
	http_var_t *var;

	var = (http_var_t *)key;

	if (var->name)
		free(var->name);
	if (var->value)
		free(var->value);
	free(var);

	return 1;
}