httpp.c 8 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 15
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

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

16 17 18 19
#ifdef _WIN32
#define strcasecmp stricmp
#endif

Michael Smith's avatar
Michael Smith committed
20 21
#define MAX_HEADERS 32

Jack Moffitt's avatar
Jack Moffitt committed
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
/* 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);

	/* 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	 
	*/
57
	int i, lines = 0;
Jack Moffitt's avatar
Jack Moffitt committed
58
	line[lines] = data;
Michael Smith's avatar
Michael Smith committed
59
	for (i = 0; i < len && lines < MAX_HEADERS; i++) {
Jack Moffitt's avatar
Jack Moffitt committed
60 61 62 63 64
		if (data[i] == '\r')
			data[i] = '\0';
		if (data[i] == '\n') {
			lines++;
			data[i] = '\0';
Michael Smith's avatar
Michael Smith committed
65 66 67
			if (i + 1 < len) {
				if (data[i + 1] == '\n' || data[i + 1] == '\r')
					break;
Jack Moffitt's avatar
Jack Moffitt committed
68
				line[lines] = &data[i + 1];
Michael Smith's avatar
Michael Smith committed
69
            }
Jack Moffitt's avatar
Jack Moffitt committed
70 71 72 73 74
		}
	}

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

    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)
{
    char *data;
    char *line[MAX_HEADERS];
    int lines, slen,i, whitespace=0, where=0,code;
    char *version=NULL, *resp_code=NULL, *message=NULL;
    
    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;
    }

165
    httpp_setvar(parser, HTTPP_VAR_ERROR_CODE, resp_code);
166 167 168 169 170 171
    code = atoi(resp_code);
    if(code < 200 || code >= 300) {
        httpp_setvar(parser, HTTPP_VAR_ERROR_MESSAGE, message);
    }

    httpp_setvar(parser, HTTPP_VAR_URI, uri);
172
	httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "NONE");
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

    parse_headers(parser, line, lines);

	free(data);

	return 1;
}

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;
    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);
Jack Moffitt's avatar
Jack Moffitt committed
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

	/* 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)
		parser->uri = strdup(uri);
	else
		parser->uri = NULL;

	if ((version != NULL) && ((tmp = strchr(version, '/')) != NULL)) {
		tmp[0] = '\0';
		if ((strlen(version) > 0) && (strlen(&tmp[1]) > 0)) {
258
			httpp_setvar(parser, HTTPP_VAR_PROTOCOL, version);
Jack Moffitt's avatar
Jack Moffitt committed
259 260 261 262 263 264 265 266 267 268 269 270 271
			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:
272
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "GET");
Jack Moffitt's avatar
Jack Moffitt committed
273 274
			break;
		case httpp_req_post:
275
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "POST");
Jack Moffitt's avatar
Jack Moffitt committed
276 277
			break;
		case httpp_req_head:
278
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "HEAD");
Jack Moffitt's avatar
Jack Moffitt committed
279 280
			break;
		case httpp_req_source:
281
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "SOURCE");
Jack Moffitt's avatar
Jack Moffitt committed
282 283
			break;
		case httpp_req_play:
284
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "PLAY");
Jack Moffitt's avatar
Jack Moffitt committed
285 286
			break;
		case httpp_req_stats:
287
			httpp_setvar(parser, HTTPP_VAR_REQ_TYPE, "STATS");
Jack Moffitt's avatar
Jack Moffitt committed
288 289 290 291 292 293 294 295 296
			break;
		default:
			break;
		}
	} else {
		free(data);
		return 0;
	}

297
    if (parser->uri != NULL) {
Jack Moffitt's avatar
Jack Moffitt committed
298 299 300 301 302 303
		httpp_setvar(parser, HTTPP_VAR_URI, parser->uri);
	} else {
		free(data);
		return 0;
	}

304
    parse_headers(parser, line, lines);
Jack Moffitt's avatar
Jack Moffitt committed
305 306 307

	free(data);

308
	return 1;
Jack Moffitt's avatar
Jack Moffitt committed
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
}

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;
        var.value = NULL;

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

346
void httpp_clear(http_parser_t *parser)
Jack Moffitt's avatar
Jack Moffitt committed
347 348 349 350 351 352 353 354 355
{
	parser->req_type = httpp_req_none;
	if (parser->uri)
		free(parser->uri);
	parser->uri = NULL;
	avl_tree_free(parser->vars, _free_vars);
	parser->vars = NULL;
}

356 357 358 359 360 361
void httpp_destroy(http_parser_t *parser)
{
    httpp_clear(parser);
    free(parser);
}

Jack Moffitt's avatar
Jack Moffitt committed
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 *_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;
}