tun hanterar frames

dnstun.c

@@ -21,6 +21,8 @@
 #include <signal.h>
 #include <unistd.h>
 #include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <err.h>
 
 #include "tun.h"
@@ -28,6 +30,8 @@
 
 #define MAX(a,b) ((a)>(b)?(a):(b))
 
+#define FRAMESIZE (64*1024)
+
 int running = 1;
 
 static void
@@ -41,9 +45,11 @@ tunnel(int tun_fd, int dns_fd)
 	int i;
 	int read;
 	fd_set fds;
-	char buf[4096];
 	struct timeval tv;
-	
+	struct tun_frame *frame;
+
+	frame = malloc(FRAMESIZE);
+
 	while (running) {
 		tv.tv_sec = 1;
 		tv.tv_usec = 0;
@@ -64,25 +70,32 @@ tunnel(int tun_fd, int dns_fd)
 		}
 		
 		if(i == 0) {
-			dns_ping(dns_fd);
+			//dns_ping(dns_fd);
 		} else {
 			if(FD_ISSET(tun_fd, &fds)) {
-				read = read_tun(tun_fd, buf, sizeof(buf));
+				read = read_tun(tun_fd, frame, FRAMESIZE);
 				if (read > 0) {
+					int fd;
+
+					fd = open("moo", O_WRONLY | O_CREAT, S_IRGRP);
+					write(fd, frame->data, read - 4);
+					close(fd);
 					printf("Got data on tun! %d bytes\n", read);
-					dns_handle_tun(dns_fd, buf, read);
+					dns_handle_tun(dns_fd, frame->data, read - 4);
 				}
 			}
 			if(FD_ISSET(dns_fd, &fds)) {
-				read = dns_read(dns_fd, buf, sizeof(buf));
+				read = dns_read(dns_fd, frame->data, FRAMESIZE-4);
 				if (read > 0) {
 					printf("Got data on dns! %d bytes\n", read);
-					write_tun(tun_fd, buf, read);
+					write_tun(tun_fd, frame, read + 4);
 				}
 			} 
 		}
 	}
 
+	free(frame);
+
 	return 0;
 }
 

dnstund.c

@@ -45,8 +45,10 @@ tunnel(int tun_fd, int dns_fd)
 	int i;
 	int read;
 	fd_set fds;
-	char buf[64*1024];
 	struct timeval tv;
+	struct tun_frame *frame;
+
+	frame = malloc(64*1024);
 	
 	while (running) {
 		tv.tv_sec = 1;
@@ -68,18 +70,20 @@ tunnel(int tun_fd, int dns_fd)
 		
 		if(i != 0) {
 			if(FD_ISSET(tun_fd, &fds)) {
-				read = read_tun(tun_fd, buf, sizeof(buf));
+				read = read_tun(tun_fd, frame, 64*1024);
 				if(read > 0) 
-					dnsd_queuepacket(buf, read);
+					dnsd_queuepacket(frame->data, read - 4);
 			}
 			if(FD_ISSET(dns_fd, &fds)) {
-				read = dnsd_read(dns_fd, buf, sizeof(buf));
+				read = dnsd_read(dns_fd, frame->data, 64*1024-4);
 				if(read > 0)
-					write_tun(tun_fd, buf, read);
+					write_tun(tun_fd, frame, read + 4);
 			} 
 		}
 	}
 
+	free(frame);
+
 	return 0;
 }
 

tun.c

@@ -118,9 +118,9 @@ close_tun(int tun_fd)
 }
 
 int 
-write_tun(int tun_fd, uint8_t *buf, int len) 
+write_tun(int tun_fd, struct tun_frame *frame, int len) 
 {
-	if (write(tun_fd, buf, len) != len) {
+	if (write(tun_fd, frame, len) != len) {
 		warn("write_tun");
 		return 1;
 	}
@@ -129,8 +129,8 @@ write_tun(int tun_fd, uint8_t *buf, int len)
 }
 
 int 
-read_tun(int tun_fd, uint8_t *buf, int len) 
+read_tun(int tun_fd, struct tun_frame *frame, int len) 
 {
-	return read(tun_fd, buf, len);
+	return read(tun_fd, frame, len);
 }
 

tun.h

@@ -19,9 +19,16 @@
 #ifndef _TUN_H_
 #define _TUN_H_
 
+struct tun_frame
+{
+	short flags;
+	short proto;
+	char data[];
+};
+
 int open_tun();
 void close_tun(int);
-int write_tun(int, uint8_t *, int);
+int write_tun(int, struct tun_frame *, int);
-int read_tun(int, uint8_t *, int);
+int read_tun(int, struct tun_frame *, int);
 
 #endif /* _TUN_H_ */