added pcap.lua for the vtunnel bridge, whoops

vTunnel/pcap.lua

@@ -0,0 +1,35 @@
+local pcap = {}
+local function uint32(n)
+ s = ""
+ for i = 3, 0, -1 do
+  s=s..string.char((n>>(8*i))%256)
+ end
+ return s
+end
+local function uint16(n)
+ s = ""
+ for i = 1, 0, -1 do
+  s=s..string.char((n>>(8*i))%256)
+ end
+ return s
+end
+
+function pcap.header(type)
+ local s=uint32(0xa1b2c3d4) -- magic number
+ s=s..uint16(2) -- major version
+ s=s..uint16(4) -- minor version
+ s=s..uint32(0) -- timezone
+ s=s..uint32(0) -- accuracy
+ s=s..uint32(2^16) -- snaplen
+ s=s..uint32(type or 147)
+ return s
+end
+function pcap.packet(d)
+ local s = uint32(os.time()) -- timestamp
+ s=s..uint32(0) -- usec
+ s=s..uint32(d:len()) -- included length
+ s=s..uint32(d:len()) -- actual length
+ return s..d
+end
+
+return pcap