diff --git a/src/bsd/device.c b/src/bsd/device.c
index 474612f1..70f4757f 100644
--- a/src/bsd/device.c
+++ b/src/bsd/device.c
@@ -142,13 +142,13 @@ void close_device(void) {
 }
 
 bool read_packet(vpn_packet_t *packet) {
-	int lenin;
+	int inlen;
 
 	cp();
 
 	switch(device_type) {
 		case DEVICE_TYPE_TUN:
-			if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
+			if((inlen = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
 				logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 					   device, strerror(errno));
 				return false;
@@ -170,14 +170,14 @@ bool read_packet(vpn_packet_t *packet) {
 					return false;
 			}
 
-			packet->len = lenin + 14;
+			packet->len = inlen + 14;
 			break;
 
 		case DEVICE_TYPE_TUNIFHEAD: {
 			u_int32_t type;
 			struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
 
-			if((lenin = readv(device_fd, vector, 2)) <= 0) {
+			if((inlen = readv(device_fd, vector, 2)) <= 0) {
 				logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 					   device, strerror(errno));
 				return false;
@@ -201,18 +201,18 @@ bool read_packet(vpn_packet_t *packet) {
 					return false;
 			}
 
-			packet->len = lenin + 10;
+			packet->len = inlen + 10;
 			break;
 		}
 
 		case DEVICE_TYPE_TAP:
-			if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
+			if((inlen = read(device_fd, packet->data, MTU)) <= 0) {
 				logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 					   device, strerror(errno));
 				return false;
 			}
 
-			packet->len = lenin;
+			packet->len = inlen;
 			break;
 
 		default:
diff --git a/src/cygwin/device.c b/src/cygwin/device.c
index db8cc9e6..c4c85d80 100644
--- a/src/cygwin/device.c
+++ b/src/cygwin/device.c
@@ -176,7 +176,7 @@ bool setup_device(void) {
 		   It passes everything it reads to the socket. */
 	
 		char buf[MTU];
-		long lenin;
+		long inlen;
 
 		CloseHandle(device_handle);
 
@@ -199,8 +199,8 @@ bool setup_device(void) {
 		/* Pass packets */
 
 		for(;;) {
-			ReadFile(device_handle, buf, MTU, &lenin, NULL);
-			write(sp[1], buf, lenin);
+			ReadFile(device_handle, buf, MTU, &inlen, NULL);
+			write(sp[1], buf, inlen);
 		}
 	}
 
@@ -228,17 +228,17 @@ void close_device(void) {
 }
 
 bool read_packet(vpn_packet_t *packet) {
-	int lenin;
+	int inlen;
 
 	cp();
 
-	if((lenin = read(sp[0], packet->data, MTU)) <= 0) {
+	if((inlen = read(sp[0], packet->data, MTU)) <= 0) {
 		logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 			   device, strerror(errno));
 		return false;
 	}
 	
-	packet->len = lenin;
+	packet->len = inlen;
 
 	device_total_in += packet->len;
 
@@ -249,14 +249,14 @@ bool read_packet(vpn_packet_t *packet) {
 }
 
 bool write_packet(vpn_packet_t *packet) {
-	long lenout;
+	long outlen;
 
 	cp();
 
 	ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
 			   packet->len, device_info);
 
-	if(!WriteFile (device_handle, packet->data, packet->len, &lenout, NULL)) {
+	if(!WriteFile (device_handle, packet->data, packet->len, &outlen, NULL)) {
 		logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
 		return false;
 	}
diff --git a/src/linux/device.c b/src/linux/device.c
index 519896e7..90ba3849 100644
--- a/src/linux/device.c
+++ b/src/linux/device.c
@@ -118,43 +118,43 @@ void close_device(void) {
 }
 
 bool read_packet(vpn_packet_t *packet) {
-	int lenin;
+	int inlen;
 	
 	cp();
 
 	switch(device_type) {
 		case DEVICE_TYPE_TUN:
-			lenin = read(device_fd, packet->data + 10, MTU - 10);
+			inlen = read(device_fd, packet->data + 10, MTU - 10);
 
-			if(lenin <= 0) {
+			if(inlen <= 0) {
 				logger(LOG_ERR, _("Error while reading from %s %s: %s"),
 					   device_info, device, strerror(errno));
 				return false;
 			}
 
-			packet->len = lenin + 10;
+			packet->len = inlen + 10;
 			break;
 		case DEVICE_TYPE_TAP:
-			lenin = read(device_fd, packet->data, MTU);
+			inlen = read(device_fd, packet->data, MTU);
 
-			if(lenin <= 0) {
+			if(inlen <= 0) {
 				logger(LOG_ERR, _("Error while reading from %s %s: %s"),
 					   device_info, device, strerror(errno));
 				return false;
 			}
 
-			packet->len = lenin;
+			packet->len = inlen;
 			break;
 		case DEVICE_TYPE_ETHERTAP:
-			lenin = read(device_fd, packet->data - 2, MTU + 2);
+			inlen = read(device_fd, packet->data - 2, MTU + 2);
 
-			if(lenin <= 0) {
+			if(inlen <= 0) {
 				logger(LOG_ERR, _("Error while reading from %s %s: %s"),
 					   device_info, device, strerror(errno));
 				return false;
 			}
 
-			packet->len = lenin - 2;
+			packet->len = inlen - 2;
 			break;
 	}
 
diff --git a/src/meta.c b/src/meta.c
index af37d018..78b81604 100644
--- a/src/meta.c
+++ b/src/meta.c
@@ -137,7 +137,7 @@ void broadcast_meta(connection_t *from, const char *buffer, int length) {
 
 bool receive_meta(connection_t *c) {
 	int oldlen, i, result;
-	int lenin, lenout, reqlen;
+	int inlen, outlen, reqlen;
 	bool decrypted = false;
 	char inbuf[MAXBUFSIZE];
 
@@ -152,10 +152,10 @@ bool receive_meta(connection_t *c) {
 	   - If not, keep stuff in buffer and exit.
 	 */
 
-	lenin = recv(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen, 0);
+	inlen = recv(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen, 0);
 
-	if(lenin <= 0) {
-		if(!lenin || !errno) {
+	if(inlen <= 0) {
+		if(!inlen || !errno) {
 			ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"),
 					   c->name, c->hostname);
 		} else if(errno == EINTR)
@@ -168,19 +168,19 @@ bool receive_meta(connection_t *c) {
 	}
 
 	oldlen = c->buflen;
-	c->buflen += lenin;
+	c->buflen += inlen;
 
-	while(lenin > 0) {
+	while(inlen > 0) {
 		/* Decrypt */
 
 		if(c->status.decryptin && !decrypted) {
-			result = EVP_DecryptUpdate(c->inctx, (unsigned char *)inbuf, &lenout, (unsigned char *)c->buffer + oldlen, lenin);
-			if(!result || lenout != lenin) {
+			result = EVP_DecryptUpdate(c->inctx, (unsigned char *)inbuf, &outlen, (unsigned char *)c->buffer + oldlen, inlen);
+			if(!result || outlen != inlen) {
 				logger(LOG_ERR, _("Error while decrypting metadata from %s (%s): %s"),
 						c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
 				return false;
 			}
-			memcpy(c->buffer + oldlen, inbuf, lenin);
+			memcpy(c->buffer + oldlen, inbuf, inlen);
 			decrypted = true;
 		}
 
@@ -191,7 +191,7 @@ bool receive_meta(connection_t *c) {
 				receive_tcppacket(c, c->buffer, c->tcplen);
 
 				c->buflen -= c->tcplen;
-				lenin -= c->tcplen - oldlen;
+				inlen -= c->tcplen - oldlen;
 				memmove(c->buffer, c->buffer + c->tcplen, c->buflen);
 				oldlen = 0;
 				c->tcplen = 0;
@@ -219,7 +219,7 @@ bool receive_meta(connection_t *c) {
 				return false;
 
 			c->buflen -= reqlen;
-			lenin -= reqlen - oldlen;
+			inlen -= reqlen - oldlen;
 			memmove(c->buffer, c->buffer + reqlen, c->buflen);
 			oldlen = 0;
 			continue;
diff --git a/src/mingw/device.c b/src/mingw/device.c
index 0e203e64..b3cbe3b3 100644
--- a/src/mingw/device.c
+++ b/src/mingw/device.c
@@ -336,7 +336,7 @@ bool read_packet(vpn_packet_t *packet) {
 }
 
 bool write_packet(vpn_packet_t *packet) {
-	long lenout;
+	long outlen;
 	OVERLAPPED overlapped = {0};
 
 	cp();
@@ -344,7 +344,7 @@ bool write_packet(vpn_packet_t *packet) {
 	ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
 			   packet->len, device_info);
 
-	if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
+	if(!WriteFile(device_handle, packet->data, packet->len, &outlen, &overlapped)) {
 		logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
 		return false;
 	}
diff --git a/src/raw_socket/device.c b/src/raw_socket/device.c
index ac7cc57a..c246d1bb 100644
--- a/src/raw_socket/device.c
+++ b/src/raw_socket/device.c
@@ -91,17 +91,17 @@ void close_device(void) {
 }
 
 bool read_packet(vpn_packet_t *packet) {
-	int lenin;
+	int inlen;
 
 	cp();
 
-	if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
+	if((inlen = read(device_fd, packet->data, MTU)) <= 0) {
 		logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 			   device, strerror(errno));
 		return false;
 	}
 
-	packet->len = lenin;
+	packet->len = inlen;
 
 	device_total_in += packet->len;
 
diff --git a/src/solaris/device.c b/src/solaris/device.c
index c66db906..25f66f38 100644
--- a/src/solaris/device.c
+++ b/src/solaris/device.c
@@ -114,11 +114,11 @@ void close_device(void) {
 }
 
 bool read_packet(vpn_packet_t *packet) {
-	int lenin;
+	int inlen;
 
 	cp();
 
-	if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
+	if((inlen = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
 		logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 			   device, strerror(errno));
 		return false;
@@ -140,7 +140,7 @@ bool read_packet(vpn_packet_t *packet) {
 			return false;
 	}
 
-	packet->len = lenin + 14;
+	packet->len = inlen + 14;
 
 	device_total_in += packet->len;
 
diff --git a/src/uml_socket/device.c b/src/uml_socket/device.c
index 669d78ed..27fdd337 100644
--- a/src/uml_socket/device.c
+++ b/src/uml_socket/device.c
@@ -172,7 +172,7 @@ void close_device(void) {
 }
 
 bool read_packet(vpn_packet_t *packet) {
-	int lenin;
+	int inlen;
 
 	cp();
 
@@ -202,7 +202,7 @@ bool read_packet(vpn_packet_t *packet) {
 		}
 
 		case 1: {
-			if((lenin = read(request_fd, &request, sizeof request)) != sizeof request) {
+			if((inlen = read(request_fd, &request, sizeof request)) != sizeof request) {
 				logger(LOG_ERR, _("Error while reading request from %s %s: %s"), device_info,
 					   device, strerror(errno));
 				running = false;
@@ -232,14 +232,14 @@ bool read_packet(vpn_packet_t *packet) {
 		}
 
 		case 2: {
-			if((lenin = read(data_fd, packet->data, MTU)) <= 0) {
+			if((inlen = read(data_fd, packet->data, MTU)) <= 0) {
 				logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 					   device, strerror(errno));
 				running = false;
 				return false;
 			}
 
-			packet->len = lenin;
+			packet->len = inlen;
 
 			device_total_in += packet->len;