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16 nishi 1 
/* $Id: http.c 70 2024-09-19 09:23:45Z nishi $ */
2 
 
3 
#define SOURCE
4 
 
43 nishi 5 
#include "../config.h"
6 
 
16 nishi 7 
#include "tw_http.h"
8 
 
9 
#include "tw_server.h"
10 
 
11 
#include <cm_log.h>
12 
#include <cm_string.h>
13 
 
14 
#include <stdbool.h>
15 
#include <stdlib.h>
17 nishi 16 
#include <string.h>
16 nishi 17 
 
17 nishi 18 
#ifdef __MINGW32__
19 
#include <winsock2.h>
20 
#else
21 
#include <sys/select.h>
22 
#endif
23 
 
16 nishi 24 
void tw_free_request(struct tw_http_request* req) {
25 
	if(req->method != NULL) free(req->method);
26 
	if(req->path != NULL) free(req->path);
20 nishi 27 
	if(req->query != NULL) free(req->query);
16 nishi 28 
	if(req->headers != NULL) {
29 
		int i;
30 
		for(i = 0; req->headers[i] != NULL; i++) free(req->headers[i]);
31 
		free(req->headers);
32 
	}
33 
	if(req->body != NULL) free(req->body);
34 
	if(req->version != NULL) free(req->version);
64 nishi 35 
 
36 
	req->method = NULL;
37 
	req->path = NULL;
38 
	req->query = NULL;
39 
	req->headers = NULL;
40 
	req->body = NULL;
41 
	req->version = NULL;
16 nishi 42 
}
43 
 
44 
int tw_http_parse(SSL* ssl, int sock, struct tw_http_request* req) {
45 
	char buffer[512];
46 
	char cbuf[2];
47 
	int phase = 0;
48 
	fd_set fds;
49 
 
50 
	bool bad = false;
51 
 
52 
	cbuf[1] = 0;
53 
 
54 
	req->method = NULL;
55 
	req->path = NULL;
20 nishi 56 
	req->query = NULL;
16 nishi 57 
	req->headers = NULL;
58 
	req->body = NULL;
59 
	req->version = NULL;
60 
 
61 
	char* header = malloc(1);
62 
	header[0] = 0;
63 
	int nl = 0;
64 
 
65 
	while(1) {
66 
		FD_ZERO(&fds);
67 
		FD_SET(sock, &fds);
68 
		struct timeval tv;
69 
		tv.tv_sec = 5;
70 
		tv.tv_usec = 0;
43 nishi 71 
#ifndef NO_SSL
23 nishi 72 
		if(ssl == NULL || !SSL_has_pending(ssl)) {
43 nishi 73 
#endif
22 nishi 74 
			int n = select(FD_SETSIZE, &fds, NULL, NULL, &tv);
75 
			if(n <= 0) {
46 nishi 76 
				cm_log("HTTP", "Timeout, disconncting");
22 nishi 77 
				free(header);
78 
				tw_free_request(req);
79 
				return -1;
80 
			}
43 nishi 81 
#ifndef NO_SSL
22 nishi 82 
		}
43 nishi 83 
#endif
16 nishi 84 
		int len = tw_read(ssl, sock, buffer, 512);
70 nishi 85 
		if(len <= 0) {
64 nishi 86 
			bad = true;
87 
			break;
88 
		}
16 nishi 89 
		int i;
90 
		for(i = 0; i < len; i++) {
91 
			char c = buffer[i];
92 
			if(phase == 0) {
93 
				if(c == ' ') {
94 
					if(req->method == NULL) {
95 
						tw_free_request(req);
96 
						bad = true;
97 
						goto getout;
98 
					} else {
99 
						phase++;
100 
					}
101 
				} else {
102 
					if(req->method == NULL) {
103 
						req->method = malloc(1);
104 
						req->method[0] = 0;
105 
					}
106 
					cbuf[0] = c;
107 
					char* tmp = req->method;
108 
					req->method = cm_strcat(tmp, cbuf);
109 
					free(tmp);
110 
				}
111 
			} else if(phase == 1) {
112 
				if(c == ' ') {
113 
					if(req->path == NULL) {
114 
						tw_free_request(req);
115 
						bad = true;
116 
						goto getout;
117 
					} else {
118 
						phase++;
119 
					}
120 
				} else {
121 
					if(req->path == NULL) {
122 
						req->path = malloc(1);
123 
						req->path[0] = 0;
124 
					}
125 
					cbuf[0] = c;
126 
					char* tmp = req->path;
127 
					req->path = cm_strcat(tmp, cbuf);
128 
					free(tmp);
129 
				}
130 
			} else if(phase == 2) {
131 
				if(c == '\n') {
132 
					if(req->version == NULL) {
133 
						tw_free_request(req);
134 
						bad = true;
135 
						goto getout;
136 
					} else {
137 
						/* We have Method, Path, Version now */
138 
 
139 
						if(strcmp(req->version, "HTTP/1.1") != 0 && strcmp(req->version, "HTTP/1.0") != 0) {
140 
							cm_log("HTTP", "Bad HTTP Version");
141 
							bad = true;
142 
							goto getout;
143 
						}
144 
 
145 
						int j;
146 
						char* p = malloc(1);
147 
						p[0] = 0;
148 
						for(j = 0; req->path[j] != 0; j++) {
149 
							if(req->path[j] == '/') {
150 
								cbuf[0] = '/';
151 
								for(; req->path[j] != 0 && req->path[j] == '/'; j++)
152 
									;
153 
								j--;
154 
							} else {
155 
								cbuf[0] = req->path[j];
156 
							}
157 
							char* tmp = p;
158 
							p = cm_strcat(tmp, cbuf);
159 
							free(tmp);
160 
						}
161 
						free(req->path);
162 
						req->path = p;
163 
 
164 
						int incr = 0;
165 
						p = malloc(1);
166 
						p[0] = 0;
167 
						for(j = 0;; j++) {
168 
							if(req->path[j] == '/' || req->path[j] == 0) {
169 
								char oldc = req->path[j];
170 
								cbuf[0] = oldc;
171 
								req->path[j] = 0;
172 
 
173 
								char* pth = req->path + incr;
174 
 
175 
								if(strcmp(pth, "..") == 0) {
176 
									int k;
177 
									if(p[strlen(p) - 1] == '/') p[strlen(p) - 1] = 0;
178 
									for(k = strlen(p) - 1; k >= 0; k--) {
179 
										if(p[k] == '/') {
180 
											p[k + 1] = 0;
181 
											break;
182 
										}
183 
									}
184 
									if(strlen(p) == 0) {
185 
										free(p);
186 
										p = cm_strdup("/");
187 
									}
188 
								} else if(strcmp(pth, ".") == 0) {
189 
								} else {
190 
									char* tmp = p;
191 
									p = cm_strcat3(tmp, pth, cbuf);
192 
									free(tmp);
193 
								}
194 
 
195 
								incr = j + 1;
196 
								if(oldc == 0) break;
197 
							}
198 
						}
199 
						free(req->path);
200 
						req->path = p;
201 
 
202 
						cm_log("HTTP", "Request: %s %s %s", req->method, req->path, req->version);
203 
 
204 
						phase++;
205 
					}
206 
				} else if(c != '\r') {
207 
					if(req->version == NULL) {
208 
						req->version = malloc(1);
209 
						req->version[0] = 0;
210 
					}
211 
					cbuf[0] = c;
212 
					char* tmp = req->version;
213 
					req->version = cm_strcat(tmp, cbuf);
214 
					free(tmp);
215 
				}
216 
			} else if(phase == 3) {
217 
				if(c == '\n') {
218 
					nl++;
219 
					if(nl == 2) {
220 
						phase++;
221 
						goto getout;
222 
					} else {
223 
						if(req->headers == NULL) {
224 
							req->headers = malloc(sizeof(*req->headers));
225 
							req->headers[0] = NULL;
226 
						}
227 
						int j;
228 
						for(j = 0; header[j] != 0; j++) {
229 
							if(header[j] == ':') {
230 
								header[j] = 0;
231 
								j++;
232 
								for(; header[j] != 0 && (header[j] == ' ' || header[j] == '\t'); j++)
233 
									;
234 
								char* kv = header;
235 
								char* vv = header + j;
236 
 
237 
								char** old = req->headers;
238 
								int k;
239 
								for(k = 0; old[k] != NULL; k++)
240 
									;
241 
								req->headers = malloc(sizeof(*req->headers) * (k + 3));
242 
								for(k = 0; old[k] != NULL; k++) req->headers[k] = old[k];
243 
								req->headers[k] = cm_strdup(kv);
244 
								req->headers[k + 1] = cm_strdup(vv);
245 
								req->headers[k + 2] = NULL;
246 
								free(old);
247 
 
248 
								cm_log("HTTP", "Header: %s: %s", kv, vv);
249 
 
250 
								break;
251 
							}
252 
						}
253 
						free(header);
254 
						header = malloc(1);
255 
						header[0] = 0;
256 
					}
257 
				} else if(c != '\r') {
258 
					nl = 0;
259 
					cbuf[0] = c;
260 
					char* tmp = header;
261 
					header = cm_strcat(tmp, cbuf);
262 
					free(tmp);
263 
				}
264 
			}
265 
		}
266 
	}
267 
getout:
268 
	free(header);
269 
	if(bad) {
270 
		tw_free_request(req);
271 
		return 1;
272 
	}
20 nishi 273 
	char* result = malloc(1);
274 
	result[0] = 0;
275 
	int i;
276 
	for(i = 0; req->path[i] != 0; i++) {
277 
		if(req->path[i] == '?') {
278 
			req->path[i] = 0;
279 
			req->query = cm_strdup(req->path + i + 1);
280 
			break;
281 
		}
282 
	}
283 
	for(i = 0; req->path[i] != 0; i++) {
284 
		if(req->path[i] == '%') {
285 
			if(req->path[i + 1] == 0) continue;
286 
			cbuf[0] = cm_hex(req->path + i + 1, 2);
70 nishi 287 
			if(cbuf[0] != '\\') {
288 
				char* tmp = result;
289 
				result = cm_strcat(tmp, cbuf);
290 
				free(tmp);
291 
			}
20 nishi 292 
			i += 2;
70 nishi 293 
		} else if(req->path[i] != '\\') {
20 nishi 294 
			cbuf[0] = req->path[i];
295 
			char* tmp = result;
296 
			result = cm_strcat(tmp, cbuf);
297 
			free(tmp);
298 
		}
299 
	}
300 
	free(req->path);
301 
	req->path = result;
69 nishi 302 
 
303 
	int incr = 0;
304 
	char* p = malloc(1);
305 
	p[0] = 0;
306 
	int j;
307 
	for(j = 0;; j++) {
308 
		if(req->path[j] == '/' || req->path[j] == 0) {
309 
			char oldc = req->path[j];
310 
			cbuf[0] = oldc;
311 
			req->path[j] = 0;
312 
 
313 
			char* pth = req->path + incr;
314 
 
315 
			if(strcmp(pth, "..") == 0) {
316 
				int k;
317 
				if(p[strlen(p) - 1] == '/') p[strlen(p) - 1] = 0;
318 
				for(k = strlen(p) - 1; k >= 0; k--) {
319 
					if(p[k] == '/') {
320 
						p[k + 1] = 0;
321 
						break;
322 
					}
323 
				}
324 
				if(strlen(p) == 0) {
325 
					free(p);
326 
					p = cm_strdup("/");
327 
				}
328 
			} else if(strcmp(pth, ".") == 0) {
70 nishi 329 
			} else {
69 nishi 330 
				char* tmp = p;
331 
				p = cm_strcat3(tmp, pth, cbuf);
332 
				free(tmp);
333 
			}
334 
 
335 
			incr = j + 1;
336 
			if(oldc == 0) break;
337 
		}
338 
	}
339 
	free(req->path);
340 
	req->path = p;
16 nishi 341 
	return 0;
342 
}