From e60a97534bdbd33023efa311a7194d67bf71f62e Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Fri, 6 Mar 2015 20:16:30 +0100
Subject: [PATCH] mibuild/sim: able to visualize arp requests with wireshark
 now need to find why that is not responding...

---
 mibuild/sim/server.py     | 33 +++++++++++++++++++++++++++------
 mibuild/sim/server_tb.cpp |  4 ++++
 2 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/mibuild/sim/server.py b/mibuild/sim/server.py
index ea8bb03c..87981fca 100644
--- a/mibuild/sim/server.py
+++ b/mibuild/sim/server.py
@@ -6,6 +6,9 @@ import os
 import pty
 import time
 import threading
+import subprocess
+import struct
+import fcntl
 
 messages= {
 	"EXIT":		0,
@@ -30,6 +33,14 @@ class VerilatorServer:
 		self.serial = master
 		self.serial_name = os.ttyname(slave)
 
+		os.system("openvpn --mktun --dev tap0")
+		os.system("ip link set tap0 up")
+		os.system("ip addr add 192.169.0.14/24 dev tap0")
+		os.system("iface tap0 inet")
+		os.system("mknod /dev/net/tap c 10 200")
+		os.system("chmod 600 /dev/net/tap")
+
+
 		self.ack = False
 
 		self._print_banner()
@@ -67,6 +78,8 @@ class VerilatorServer:
 		if hasattr(self, "socket"):
 			self.socket.shutdown(socket.SHUT_RDWR)
 			self.socket.close()
+		os.system("openvpn --rmtun --dev tap0")
+		os.system("rm -f /dev/net/tap")
 		self._cleanup_file()
 
 # XXX proof of concept
@@ -74,6 +87,10 @@ server = VerilatorServer()
 server.accept()
 print("Connection accepted")
 
+TUNSETIFF	= 0x400454ca
+IFF_TAP		= 0x0002
+IFF_NO_PI 	= 0x1000
+
 def read():
 	while True:
 		packet = server.recv()
@@ -82,10 +99,10 @@ def read():
 				c = bytes(chr(packet[1]).encode('utf-8'))
 				os.write(server.serial, c)
 			elif packet[0] == messages["ETHERNET"]:
-				print("received ethernet")
-				for d in packet[1:]:
-					print("{:02X}".format(d), end="")
-				print("")
+				tap = os.open("/dev/net/tun", os.O_RDWR)
+				fcntl.ioctl(tap, TUNSETIFF, struct.pack("16sH", b"tap0", IFF_TAP | IFF_NO_PI))
+				os.write(tap, packet[1+8:-4])
+				os.close(tap)
 			elif packet[0] == messages["ACK"]:
 				server.ack = True
 
@@ -104,5 +121,9 @@ readthread.start()
 writethread = threading.Thread(target=write, daemon=True)
 writethread.start()
 
-while True:
-	time.sleep(1)
+try:
+    while True:
+       time.sleep(1)
+except KeyboardInterrupt:
+	server.close()
+
diff --git a/mibuild/sim/server_tb.cpp b/mibuild/sim/server_tb.cpp
index 5203a7aa..8563eebf 100644
--- a/mibuild/sim/server_tb.cpp
+++ b/mibuild/sim/server_tb.cpp
@@ -153,6 +153,7 @@ int console_service(struct sim *s)
 	return 0;
 }
 
+#ifdef ETH_SOURCE_STB
 int eth_last_source_stb = 0;
 
 int ethernet_service(struct sim *s) {
@@ -171,6 +172,7 @@ int ethernet_service(struct sim *s) {
 	}
 	eth_last_source_stb = ETH_SOURCE_STB;
 }
+#endif
 
 void sim_tick(struct sim *s)
 {
@@ -219,7 +221,9 @@ int main(int argc, char **argv, char **env)
 		if (SYS_CLK) {
 			if (console_service(&s) != 0)
 				s.run = false;
+#ifdef ETH_SOURCE_STB
 			ethernet_service(&s);
+#endif
 		}
 	}
 	s.end = clock();
-- 
2.30.2