cleanup in the tunnelcode, now sending the frameheader

dns.c

@@ -326,14 +326,15 @@ dns_read(int fd, char *buf, int buflen)
 	char name[255];
 	char rdata[4*1024];
 	HEADER *header;
+	socklen_t addrlen;
 	char packet[64*1024];
+	struct sockaddr_in from;
 
-	r = recv(fd, packet, sizeof(packet), 0);
-
-	//printf("Read %d bytes DNS reply\n", r);
+	addrlen = sizeof(struct sockaddr);
+	r = recvfrom(fd, packet, sizeof(packet), 0, (struct sockaddr*)&from, &addrlen);
 
 	if(r == -1) {
-		perror("recv");
+		perror("recvfrom");
 	} else {
 		header = (HEADER*)packet;
 		
@@ -571,8 +572,6 @@ dnsd_read(int fd, char *buf, int buflen)
 	addrlen = sizeof(struct sockaddr);
 	r = recvfrom(fd, packet, sizeof(packet), 0, (struct sockaddr*)&from, &addrlen);
 
-	//printf("Read %d bytes DNS query from %s\n", r, inet_ntoa(from.sin_addr));
-
 	if(r == -1) {
 		perror("recvfrom");
 	} else {

iodine.c

@@ -35,8 +35,6 @@
 #define MAX(a,b) ((a)>(b)?(a):(b))
 #endif
 
-#define FRAMESIZE (64*1024)
-
 int running = 1;
 
 static void
@@ -51,11 +49,9 @@ tunnel(int tun_fd, int dns_fd)
 	int read;
 	fd_set fds;
 	struct timeval tv;
-	struct tun_frame *frame;
-	long buflen;
-	char buf[64*1024];
-
-	frame = malloc(FRAMESIZE);
+	char in[64*1024];
+	long outlen;
+	char out[64*1024];
 
 	while (running) {
 		tv.tv_sec = 1;
@@ -79,37 +75,29 @@ tunnel(int tun_fd, int dns_fd)
 			dns_ping(dns_fd);
 		} else {
 			if(FD_ISSET(tun_fd, &fds)) {
-				read = read_tun(tun_fd, frame, FRAMESIZE);
-				if (read > 0) {
-					buflen = sizeof(buf);
-					compress2(buf, &buflen, frame->data, read - 4, 9);
-					dns_handle_tun(dns_fd, buf, buflen);
-				}
+				read = read_tun(tun_fd, in, sizeof(in));
+				if(read <= 0)
+					continue;
+
+				outlen = sizeof(out);
+				compress2(out, &outlen, in, read, 9);
+				dns_handle_tun(dns_fd, out, outlen);
 			}
 			if(FD_ISSET(dns_fd, &fds)) {
-				read = dns_read(dns_fd, buf, FRAMESIZE-4);
-				if (read > 0) {
-					buflen = 64*1024-4;
-					uncompress(frame->data, &buflen, buf, read);
+				read = dns_read(dns_fd, in, sizeof(in));
+				if (read <= 0) 
+					continue;
 
-					frame->flags = htons(0x0000);
-#ifdef LINUX
-					frame->proto = htons(0x0800);	// Linux wants ETH_P_IP
-#else
-					frame->proto = htons(0x0002);	// BSD wants AF_INET as long word
-#endif
-					
-					write_tun(tun_fd, frame, buflen + 4);
-					if (!dns_sending()) {
-						dns_ping(dns_fd);
-					}
-				}
+				outlen = sizeof(out);
+				uncompress(out, &outlen, in, read);
+
+				write_tun(tun_fd, out, outlen);
+				if (!dns_sending()) 
+					dns_ping(dns_fd);
 			} 
 		}
 	}
 
-	free(frame);
-
 	return 0;
 }
 
@@ -151,11 +139,6 @@ main(int argc, char **argv)
 	username = NULL;
 	foreground = 0;
 	
-	if (geteuid() != 0) {
-		printf("Run as root and you'll be happy.\n");
-		usage();
-	}
-
 	while ((choice = getopt(argc, argv, "vfhu:")) != -1) {
 		switch(choice) {
 		case 'v':
@@ -175,6 +158,11 @@ main(int argc, char **argv)
 			break;
 		}
 	}
+	
+	if (geteuid() != 0) {
+		printf("Run as root and you'll be happy.\n");
+		usage();
+	}
 
 	argc -= optind;
 	argv += optind;

iodined.c

@@ -49,11 +49,9 @@ tunnel(int tun_fd, int dns_fd)
 	int read;
 	fd_set fds;
 	struct timeval tv;
-	struct tun_frame *frame;
-	long buflen;
-	char buf[64*1024];
-
-	frame = malloc(64*1024);
+	char in[64*1024];
+	long outlen;
+	char out[64*1024];
 	
 	while (running) {
 		if (dnsd_hasack()) {
@@ -82,33 +80,27 @@ tunnel(int tun_fd, int dns_fd)
 				dnsd_forceack(dns_fd);
 		} else {
 			if(FD_ISSET(tun_fd, &fds)) {
-				read = read_tun(tun_fd, frame, 64*1024);
-				if(read > 0) {
-					buflen = sizeof(buf);
-					compress2(buf, &buflen, frame->data, read - 4, 9);
-					dnsd_queuepacket(buf, buflen);
-				}
+				read = read_tun(tun_fd, in, sizeof(in));
+				if (read <= 0) 
+					continue;
+				
+				outlen = sizeof(out);
+				compress2(out, &outlen, in, read, 9);
+				dnsd_queuepacket(out, outlen);
 			}
 			if(FD_ISSET(dns_fd, &fds)) {
-				read = dnsd_read(dns_fd, buf, 64*1024-4);
-				if(read > 0) {
-					buflen = 64*1024-4;
-					uncompress(frame->data, &buflen, buf, read);
-					
-					frame->flags = htons(0x0000);
-#ifdef LINUX
-					frame->proto = htons(0x0800);	// Linux wants ETH_P_IP
-#else
-					frame->proto = htons(0x0002);	// BSD wants AF_INET as long word
-#endif
-					write_tun(tun_fd, frame, buflen + 4);
-				}
+				read = dnsd_read(dns_fd, in, sizeof(in));
+				if (read <= 0)
+					continue;
+
+				outlen = sizeof(out);
+				uncompress(out, &outlen, in, read);
+
+				write_tun(tun_fd, out, outlen);
 			} 
 		}
 	}
 
-	free(frame);
-
 	return 0;
 }
 

tun.c

@@ -120,9 +120,21 @@ close_tun(int tun_fd)
 }
 
 int 
-write_tun(int tun_fd, struct tun_frame *frame, int len) 
+write_tun(int tun_fd, char *data, int len) 
 {
-	if (write(tun_fd, frame, len) != len) {
+#ifdef LINUX
+	data[0] = 0x00;
+	data[1] = 0x00;
+	data[2] = 0x08;
+	data[3] = 0x00;
+#else /* LINUX */
+	data[0] = 0x00;
+	data[1] = 0x00;
+	data[2] = 0x00;
+	data[3] = 0x02;
+#endif /* !LINUX */
+
+	if (write(tun_fd, data, len) != len) {
 		warn("write_tun");
 		return 1;
 	}
@@ -131,8 +143,8 @@ write_tun(int tun_fd, struct tun_frame *frame, int len)
 }
 
 int 
-read_tun(int tun_fd, struct tun_frame *frame, int len) 
+read_tun(int tun_fd, char *buf, int len) 
 {
-	return read(tun_fd, frame, len);
+	return read(tun_fd, buf, len);
 }
 

tun.h

@@ -19,16 +19,9 @@
 #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, struct tun_frame *, int);
-int read_tun(int, struct tun_frame *, int);
+int write_tun(int, char *, int);
+int read_tun(int, char *, int);
 
 #endif /* _TUN_H_ */