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16 nishi 1 
/* $Id: http.c 43 2024-09-18 09:19:03Z 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);
35 
}
36 
 
37 
int tw_http_parse(SSL* ssl, int sock, struct tw_http_request* req) {
38 
	char buffer[512];
39 
	char cbuf[2];
40 
	int phase = 0;
41 
	fd_set fds;
42 
 
43 
	bool bad = false;
44 
 
45 
	cbuf[1] = 0;
46 
 
47 
	req->method = NULL;
48 
	req->path = NULL;
20 nishi 49 
	req->query = NULL;
16 nishi 50 
	req->headers = NULL;
51 
	req->body = NULL;
52 
	req->version = NULL;
53 
 
54 
	char* header = malloc(1);
55 
	header[0] = 0;
56 
	int nl = 0;
57 
 
58 
	while(1) {
59 
		FD_ZERO(&fds);
60 
		FD_SET(sock, &fds);
61 
		struct timeval tv;
62 
		tv.tv_sec = 5;
63 
		tv.tv_usec = 0;
43 nishi 64 
#ifndef NO_SSL
23 nishi 65 
		if(ssl == NULL || !SSL_has_pending(ssl)) {
43 nishi 66 
#endif
22 nishi 67 
			int n = select(FD_SETSIZE, &fds, NULL, NULL, &tv);
68 
			if(n <= 0) {
69 
				free(header);
70 
				tw_free_request(req);
71 
				return -1;
72 
			}
43 nishi 73 
#ifndef NO_SSL
22 nishi 74 
		}
43 nishi 75 
#endif
16 nishi 76 
		int len = tw_read(ssl, sock, buffer, 512);
77 
		if(len <= 0) break;
78 
		int i;
79 
		for(i = 0; i < len; i++) {
80 
			char c = buffer[i];
81 
			if(phase == 0) {
82 
				if(c == ' ') {
83 
					if(req->method == NULL) {
84 
						tw_free_request(req);
85 
						bad = true;
86 
						goto getout;
87 
					} else {
88 
						phase++;
89 
					}
90 
				} else {
91 
					if(req->method == NULL) {
92 
						req->method = malloc(1);
93 
						req->method[0] = 0;
94 
					}
95 
					cbuf[0] = c;
96 
					char* tmp = req->method;
97 
					req->method = cm_strcat(tmp, cbuf);
98 
					free(tmp);
99 
				}
100 
			} else if(phase == 1) {
101 
				if(c == ' ') {
102 
					if(req->path == NULL) {
103 
						tw_free_request(req);
104 
						bad = true;
105 
						goto getout;
106 
					} else {
107 
						phase++;
108 
					}
109 
				} else {
110 
					if(req->path == NULL) {
111 
						req->path = malloc(1);
112 
						req->path[0] = 0;
113 
					}
114 
					cbuf[0] = c;
115 
					char* tmp = req->path;
116 
					req->path = cm_strcat(tmp, cbuf);
117 
					free(tmp);
118 
				}
119 
			} else if(phase == 2) {
120 
				if(c == '\n') {
121 
					if(req->version == NULL) {
122 
						tw_free_request(req);
123 
						bad = true;
124 
						goto getout;
125 
					} else {
126 
						/* We have Method, Path, Version now */
127 
 
128 
						if(strcmp(req->version, "HTTP/1.1") != 0 && strcmp(req->version, "HTTP/1.0") != 0) {
129 
							cm_log("HTTP", "Bad HTTP Version");
130 
							bad = true;
131 
							goto getout;
132 
						}
133 
 
134 
						int j;
135 
						char* p = malloc(1);
136 
						p[0] = 0;
137 
						for(j = 0; req->path[j] != 0; j++) {
138 
							if(req->path[j] == '/') {
139 
								cbuf[0] = '/';
140 
								for(; req->path[j] != 0 && req->path[j] == '/'; j++)
141 
									;
142 
								j--;
143 
							} else {
144 
								cbuf[0] = req->path[j];
145 
							}
146 
							char* tmp = p;
147 
							p = cm_strcat(tmp, cbuf);
148 
							free(tmp);
149 
						}
150 
						free(req->path);
151 
						req->path = p;
152 
 
153 
						int incr = 0;
154 
						p = malloc(1);
155 
						p[0] = 0;
156 
						for(j = 0;; j++) {
157 
							if(req->path[j] == '/' || req->path[j] == 0) {
158 
								char oldc = req->path[j];
159 
								cbuf[0] = oldc;
160 
								req->path[j] = 0;
161 
 
162 
								char* pth = req->path + incr;
163 
 
164 
								if(strcmp(pth, "..") == 0) {
165 
									int k;
166 
									if(p[strlen(p) - 1] == '/') p[strlen(p) - 1] = 0;
167 
									for(k = strlen(p) - 1; k >= 0; k--) {
168 
										if(p[k] == '/') {
169 
											p[k + 1] = 0;
170 
											break;
171 
										}
172 
									}
173 
									if(strlen(p) == 0) {
174 
										free(p);
175 
										p = cm_strdup("/");
176 
									}
177 
								} else if(strcmp(pth, ".") == 0) {
178 
								} else {
179 
									char* tmp = p;
180 
									p = cm_strcat3(tmp, pth, cbuf);
181 
									free(tmp);
182 
								}
183 
 
184 
								incr = j + 1;
185 
								if(oldc == 0) break;
186 
							}
187 
						}
188 
						free(req->path);
189 
						req->path = p;
190 
 
191 
						cm_log("HTTP", "Request: %s %s %s", req->method, req->path, req->version);
192 
 
193 
						phase++;
194 
					}
195 
				} else if(c != '\r') {
196 
					if(req->version == NULL) {
197 
						req->version = malloc(1);
198 
						req->version[0] = 0;
199 
					}
200 
					cbuf[0] = c;
201 
					char* tmp = req->version;
202 
					req->version = cm_strcat(tmp, cbuf);
203 
					free(tmp);
204 
				}
205 
			} else if(phase == 3) {
206 
				if(c == '\n') {
207 
					nl++;
208 
					if(nl == 2) {
209 
						phase++;
210 
						goto getout;
211 
					} else {
212 
						if(req->headers == NULL) {
213 
							req->headers = malloc(sizeof(*req->headers));
214 
							req->headers[0] = NULL;
215 
						}
216 
						int j;
217 
						for(j = 0; header[j] != 0; j++) {
218 
							if(header[j] == ':') {
219 
								header[j] = 0;
220 
								j++;
221 
								for(; header[j] != 0 && (header[j] == ' ' || header[j] == '\t'); j++)
222 
									;
223 
								char* kv = header;
224 
								char* vv = header + j;
225 
 
226 
								char** old = req->headers;
227 
								int k;
228 
								for(k = 0; old[k] != NULL; k++)
229 
									;
230 
								req->headers = malloc(sizeof(*req->headers) * (k + 3));
231 
								for(k = 0; old[k] != NULL; k++) req->headers[k] = old[k];
232 
								req->headers[k] = cm_strdup(kv);
233 
								req->headers[k + 1] = cm_strdup(vv);
234 
								req->headers[k + 2] = NULL;
235 
								free(old);
236 
 
237 
								cm_log("HTTP", "Header: %s: %s", kv, vv);
238 
 
239 
								break;
240 
							}
241 
						}
242 
						free(header);
243 
						header = malloc(1);
244 
						header[0] = 0;
245 
					}
246 
				} else if(c != '\r') {
247 
					nl = 0;
248 
					cbuf[0] = c;
249 
					char* tmp = header;
250 
					header = cm_strcat(tmp, cbuf);
251 
					free(tmp);
252 
				}
253 
			}
254 
		}
255 
	}
256 
getout:
257 
	free(header);
258 
	if(bad) {
259 
		tw_free_request(req);
260 
		return 1;
261 
	}
20 nishi 262 
	char* result = malloc(1);
263 
	result[0] = 0;
264 
	int i;
265 
	for(i = 0; req->path[i] != 0; i++) {
266 
		if(req->path[i] == '?') {
267 
			req->path[i] = 0;
268 
			req->query = cm_strdup(req->path + i + 1);
269 
			break;
270 
		}
271 
	}
272 
	for(i = 0; req->path[i] != 0; i++) {
273 
		if(req->path[i] == '%') {
274 
			if(req->path[i + 1] == 0) continue;
275 
			cbuf[0] = cm_hex(req->path + i + 1, 2);
276 
			char* tmp = result;
277 
			result = cm_strcat(tmp, cbuf);
278 
			free(tmp);
279 
			i += 2;
280 
		} else {
281 
			cbuf[0] = req->path[i];
282 
			char* tmp = result;
283 
			result = cm_strcat(tmp, cbuf);
284 
			free(tmp);
285 
		}
286 
	}
287 
	free(req->path);
288 
	req->path = result;
16 nishi 289 
	return 0;
290 
}