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