url parser

opentracker.c

@@ -31,30 +31,39 @@ struct http_data {
   io_batch iob;
   char* hdrbuf;
   int hlen;
+  char ip[16];
 };
 
-int header_complete(struct http_data* r) {
+int header_complete(struct http_data* r)
+{
 	long i;
-  long l=array_bytes(&r->r);
+
-  const char* c=array_start(&r->r);
+	long l = array_bytes(&r->r);
-  for (i=0; i+1<l; ++i) {
+	const char* c = array_start(&r->r);
+
+	for (i=0; i+1<l; ++i)
+	{
 		if (c[i]=='\n' && c[i+1]=='\n')
 			return i+2;
-    if (i+3<l &&
+
-	c[i]=='\r' && c[i+1]=='\n' &&
+		if (i+3<l && c[i]=='\r' && c[i+1]=='\n' && c[i+2]=='\r' && c[i+3]=='\n')
-	c[i+2]=='\r' && c[i+3]=='\n')
 			return i+4;
 	}
 	return 0;
 }
 
-void httperror(struct http_data* r,const char* title,const char* message) {
+void httperror(struct http_data* r,const char* title,const char* message)
+{
 	char* c;
 	c=r->hdrbuf=(char*)malloc(strlen(message)+strlen(title)+200);
-  if (!c) {
+	
+	if (!c)
+	{
 		r->hdrbuf="HTTP/1.0 500 internal error\r\nContent-Type: text/plain\r\nConnection: close\r\n\r\nout of memory\n";
 		r->hlen=strlen(r->hdrbuf);
-  } else {
+	}
+	else
+	{
 		c+=fmt_str(c,"HTTP/1.0 ");
 		c+=fmt_str(c,title);
 		c+=fmt_str(c,"\r\nContent-Type: text/html\r\nConnection: close\r\nContent-Length: ");
@@ -67,86 +76,158 @@ void httperror(struct http_data* r,const char* title,const char* message) {
 	iob_addbuf(&r->iob,r->hdrbuf,r->hlen);
 }
 
-const char* http_header(struct http_data* r,const char* h) {
+// bestimmten http parameter auslesen und adresse zurueckgeben
+
+const char* http_header(struct http_data* r,const char* h)
+{
 	long i;
-  long l=array_bytes(&r->r);
+
-  long sl=strlen(h);
+	long l = array_bytes(&r->r);
-  const char* c=array_start(&r->r);
+	long sl = strlen(h);
+	const char* c = array_start(&r->r);
+
 	for (i=0; i+sl+2<l; ++i)
-    if (c[i]=='\n' && case_equalb(c+i+1,sl,h) && c[i+sl+1]==':') {
+	{
+		if (c[i]=='\n' && case_equalb(c+i+1,sl,h) && c[i+sl+1]==':')
+		{
 			c+=i+sl+1;
 			if (*c==' ' || *c=='\t') ++c;
 			return c;
 		}
 			return 0;
+	}
 }
 
-void httpresponse(struct http_data* h,int64 s) {
+void httpresponse(struct http_data* h,int64 s)
+{
 	char* c;
 	array_cat0(&h->r);
-  c=array_start(&h->r);
+
-  if (byte_diff(c,4,"GET ")) {
+	c = array_start(&h->r);
+
+	if (byte_diff(c,4,"GET "))
+	{
 e400:
 		httperror(h,"400 Invalid Request","This server only understands GET.");
-  } else {
+	}
+	else
+	{
 		char *d;
 		int64 fd;
 		struct stat s;
+		
+		// expect 'GET /uri?nnbjhg HTTP/1.*'
 		c+=4;
+
 		for (d=c; *d!=' '&&*d!='\t'&&*d!='\n'&&*d!='\r'; ++d) ;
+
 		if (*d!=' ') goto e400;
 		*d=0;
 		if (c[0]!='/') goto e404;
 		while (c[1]=='/') ++c;
-    if (!io_readfile(&fd,c+1)) {
+		
-e404:
+		if (!byte_diff(c,9,"announce?"))
+		{
+			// info_hash, left, port, numwant, compact			
+			struct ot_peer peer;
+			byte_copy( peer.ip, h->ip, 4);
+			peer.port = 6881;
+			
+			c+=9;
+			while( *c!=' ' ) {
+				if(!byte_diff(c,10,"info_hash="))
+				{
+					// String is expected to be URL encoded, so expect
+					// (%[0-9A-F][0-9A-F]){20}
+                    int s = scan_urlencoded( 
+
+				}
+				else if(!byte_diff(c,8,"numwant="))
+				{
+					
+				}
+				else if(!byte_diff(c,8,"compact="))
+				{
+					
+				}
+				else if(!byte_diff(c,5,"port="))
+				{
+					
+				}
+				else if(!byte_diff(c,5,"left="))
+				{
+					
+				}
+
+				while( *++c!=' ' && *c!='&');
+			}
+		}
+		else if (!byte_diff(c,7,"scrape?"))
+		{
+
+		}
+		else
+		{
 			httperror(h,"404 Not Found","No such file or directory.");
-    } else {
-      if (fstat(fd,&s)==-1) {
-	io_close(fd);
             goto e404;
 		}
+
 		c=h->hdrbuf=(char*)malloc(500);
 		c+=fmt_str(c,"HTTP/1.1 Coming Up\r\nContent-Type: text/plain");
 		c+=fmt_str(c,"\r\nContent-Length: ");
-/* ANSWER SIZE*/
+		/* ANSWER SIZE*/
 		c+=fmt_ulonglong(c,s.st_size);
 		c+=fmt_str(c,"\r\nLast-Modified: ");
-/* MODIFY DATE */
+		/* MODIFY DATE */
 		c+=fmt_httpdate(c,s.st_mtime);
 		c+=fmt_str(c,"\r\nConnection: close\r\n\r\n");
 		iob_addbuf(&h->iob,h->hdrbuf,c - h->hdrbuf);
-      iob_addfile(&h->iob,fd,0,s.st_size);
+		iob_addbuf(&h->iob,tracker_answer, tzracker_answer_size);
-    }
 	}
+e404:
 	io_dontwantread(s);
 	io_wantwrite(s);
 }
 
-int main() {
+int main()
+{
 	int s=socket_tcp6();
 	uint32 scope_id;
 	char ip[16];
 	uint16 port;
+
 	if (socket_bind6_reuse(s,V6any,8000,0)==-1)
 		panic("socket_bind6_reuse");
+
 	if (socket_listen(s,16)==-1)
 		panic("socket_listen");
+
 	if (!io_fd(s))
 		panic("io_fd");
+
 	io_wantread(s);
-  for (;;) {
+
+	for (;;)
+	{
 		int64 i;
 		io_wait();
-    while ((i=io_canread())!=-1) {
+
-      if (i==s) {
+		while ((i=io_canread())!=-1)
+		{
+			if (i==s)	// ist es der serversocket?
+			{
 				int n;
-	while ((n=socket_accept6(s,ip,&port,&scope_id))!=-1) {
+				while ((n=socket_accept6(s,ip,&port,&scope_id))!=-1)
-	  if (io_fd(n)) {
+				{
+					if (io_fd(n))
+					{
 						struct http_data* h=(struct http_data*)malloc(sizeof(struct http_data));
 						io_wantread(n);
-	    if (h) {
+
+						if (h)
+						{
 							byte_zero(h,sizeof(struct http_data));
+							byte_copy(h->ip,ip,sizeof(ip));
 							io_setcookie(n,h);
 						} else
 							io_close(n);
@@ -158,44 +239,58 @@ int main() {
 					io_eagain(s);
 				else
 					carp("socket_accept6");
-      } else {
+			}
+			else
+			{
 				char buf[8192];
 				struct http_data* h=io_getcookie(i);
+
 				int l=io_tryread(i,buf,sizeof buf);
-	if (l==-3) {
+				if (l<=0)
-	  if (h) {
+				{
+					if (h)
+					{
 						array_reset(&h->r);
 						iob_reset(&h->iob);
 						free(h->hdrbuf); h->hdrbuf=0;
 					}
 					io_close(i);
-	} else if (l==0) {
-	  if (h) {
-	    array_reset(&h->r);
-	    iob_reset(&h->iob);
-	    free(h->hdrbuf); h->hdrbuf=0;
 				}
-	  io_close(i);
+				else
-	} else if (l>0) {
+				{
 					array_catb(&h->r,buf,l);
-	  if (array_failed(&h->r)) {
+
+					if (array_failed(&h->r))
+					{
 						httperror(h,"500 Server Error","request too long.");
 emerge:
 						io_dontwantread(i);
 						io_wantwrite(i);
-	  } else if (array_bytes(&h->r)>8192) {
+					}
+					else if (array_bytes(&h->r)>8192)
+					{
 						httperror(h,"500 request too long","You sent too much headers");
 						goto emerge;
-	  } else if ((l=header_complete(h)))
+					}
+					else if ((l=header_complete(h)))
+					{
 						httpresponse(h,i);
 					}
 				}
 			}
-    while ((i=io_canwrite())!=-1) {
+		}
+
+		while ((i=io_canwrite())!=-1)
+		{
 			struct http_data* h=io_getcookie(i);
+
 			int64 r=iob_send(i,&h->iob);
-      if (r==-1) io_eagain(i); else
+
-      if (r<=0) {
+			if (r==-1)
+				io_eagain(i);
+			else
+				if (r<=0)
+				{
 					array_trunc(&h->r);
 					iob_reset(&h->iob);
 					free(h->hdrbuf); h->hdrbuf=0;