Blob


1 #include <u.h>
2 #include <libc.h>
3 #include <bin.h>
4 #include <httpd.h>
6 typedef struct Strings Strings;
8 struct Strings
9 {
10 char *s1;
11 char *s2;
12 };
14 static char* abspath(HConnect *cc, char *origpath, char *curdir);
15 static int getc(HConnect*);
16 static char* getword(HConnect*);
17 static Strings parseuri(HConnect *c, char*);
18 static Strings stripsearch(char*);
20 /*
21 * parse the next request line
22 * returns:
23 * 1 ok
24 * 0 eof
25 * -1 error
26 */
27 int
28 hparsereq(HConnect *c, int timeout)
29 {
30 Strings ss;
31 char *vs, *v, *search, *uri, *origuri, *extra;
33 if(c->bin != nil){
34 hfail(c, HInternal);
35 return -1;
36 }
38 /*
39 * serve requests until a magic request.
40 * later requests have to come quickly.
41 * only works for http/1.1 or later.
42 */
43 if(timeout)
44 alarm(timeout);
45 if(hgethead(c, 0) < 0)
46 return -1;
47 if(timeout)
48 alarm(0);
49 c->reqtime = time(nil);
50 c->req.meth = getword(c);
51 if(c->req.meth == nil){
52 hfail(c, HSyntax);
53 return -1;
54 }
55 uri = getword(c);
56 if(uri == nil || strlen(uri) == 0){
57 hfail(c, HSyntax);
58 return -1;
59 }
60 v = getword(c);
61 if(v == nil){
62 if(strcmp(c->req.meth, "GET") != 0){
63 hfail(c, HUnimp, c->req.meth);
64 return -1;
65 }
66 c->req.vermaj = 0;
67 c->req.vermin = 9;
68 }else{
69 vs = v;
70 if(strncmp(vs, "HTTP/", 5) != 0){
71 hfail(c, HUnkVers, vs);
72 return -1;
73 }
74 vs += 5;
75 c->req.vermaj = strtoul(vs, &vs, 10);
76 if(*vs != '.' || c->req.vermaj != 1){
77 hfail(c, HUnkVers, vs);
78 return -1;
79 }
80 vs++;
81 c->req.vermin = strtoul(vs, &vs, 10);
82 if(*vs != '\0'){
83 hfail(c, HUnkVers, vs);
84 return -1;
85 }
87 extra = getword(c);
88 if(extra != nil){
89 hfail(c, HSyntax);
90 return -1;
91 }
92 }
94 /*
95 * the fragment is not supposed to be sent
96 * strip it 'cause some clients send it
97 */
98 origuri = uri;
99 uri = strchr(origuri, '#');
100 if(uri != nil)
101 *uri = 0;
103 /*
104 * http/1.1 requires the server to accept absolute
105 * or relative uri's. convert to relative with an absolute path
106 */
107 if(http11(c)){
108 ss = parseuri(c, origuri);
109 uri = ss.s1;
110 c->req.urihost = ss.s2;
111 if(uri == nil){
112 hfail(c, HBadReq, uri);
113 return -1;
115 origuri = uri;
118 /*
119 * munge uri for search, protection, and magic
120 */
121 ss = stripsearch(origuri);
122 origuri = ss.s1;
123 search = ss.s2;
124 uri = hurlunesc(c, origuri);
125 uri = abspath(c, uri, "/");
126 if(uri == nil || uri[0] == '\0'){
127 hfail(c, HNotFound, "no object specified");
128 return -1;
131 c->req.uri = uri;
132 c->req.search = search;
134 return 1;
137 static Strings
138 parseuri(HConnect *c, char *uri)
140 Strings ss;
141 char *urihost, *p;
143 urihost = nil;
144 if(uri[0] != '/'){
145 if(cistrncmp(uri, "http://", 7) != 0){
146 ss.s1 = nil;
147 ss.s2 = nil;
148 return ss;
150 uri += 5; /* skip http: */
153 /*
154 * anything starting with // is a host name or number
155 * hostnames consists of letters, digits, - and .
156 * for now, just ignore any port given
157 */
158 if(uri[0] == '/' && uri[1] == '/'){
159 urihost = uri + 2;
160 p = strchr(urihost, '/');
161 if(p == nil)
162 uri = hstrdup(c, "/");
163 else{
164 uri = hstrdup(c, p);
165 *p = '\0';
167 p = strchr(urihost, ':');
168 if(p != nil)
169 *p = '\0';
172 if(uri[0] != '/' || uri[1] == '/'){
173 ss.s1 = nil;
174 ss.s2 = nil;
175 return ss;
178 ss.s1 = uri;
179 ss.s2 = hlower(urihost);
180 return ss;
182 static Strings
183 stripsearch(char *uri)
185 Strings ss;
186 char *search;
188 search = strchr(uri, '?');
189 if(search != nil)
190 *search++ = 0;
191 ss.s1 = uri;
192 ss.s2 = search;
193 return ss;
196 /*
197 * to circumscribe the accessible files we have to eliminate ..'s
198 * and resolve all names from the root.
199 */
200 static char*
201 abspath(HConnect *cc, char *origpath, char *curdir)
203 char *p, *sp, *path, *work, *rpath;
204 int len, n, c;
206 if(curdir == nil)
207 curdir = "/";
208 if(origpath == nil)
209 origpath = "";
210 work = hstrdup(cc, origpath);
211 path = work;
213 /*
214 * remove any really special characters
215 */
216 for(sp = "`;| "; *sp; sp++){
217 p = strchr(path, *sp);
218 if(p)
219 *p = 0;
222 len = strlen(curdir) + strlen(path) + 2 + UTFmax;
223 if(len < 10)
224 len = 10;
225 rpath = halloc(cc, len);
226 if(*path == '/')
227 rpath[0] = 0;
228 else
229 strcpy(rpath, curdir);
230 n = strlen(rpath);
232 while(path){
233 p = strchr(path, '/');
234 if(p)
235 *p++ = 0;
236 if(strcmp(path, "..") == 0){
237 while(n > 1){
238 n--;
239 c = rpath[n];
240 rpath[n] = 0;
241 if(c == '/')
242 break;
244 }else if(strcmp(path, ".") == 0){
246 }else if(n == 1)
247 n += snprint(rpath+n, len-n, "%s", path);
248 else
249 n += snprint(rpath+n, len-n, "/%s", path);
250 path = p;
253 if(strncmp(rpath, "/bin/", 5) == 0)
254 strcpy(rpath, "/");
255 return rpath;
258 static char*
259 getword(HConnect *c)
261 char *buf;
262 int ch, n;
264 while((ch = getc(c)) == ' ' || ch == '\t' || ch == '\r')
266 if(ch == '\n')
267 return nil;
268 n = 0;
269 buf = halloc(c, 1);
270 for(;;){
271 switch(ch){
272 case ' ':
273 case '\t':
274 case '\r':
275 case '\n':
276 buf[n] = '\0';
277 return hstrdup(c, buf);
280 if(n < HMaxWord-1){
281 buf = bingrow(&c->bin, buf, n, n + 1, 0);
282 if(buf == nil)
283 return nil;
284 buf[n++] = ch;
286 ch = getc(c);
290 static int
291 getc(HConnect *c)
293 if(c->hpos < c->hstop)
294 return *c->hpos++;
295 return '\n';