1 files changed, 63 insertions, 0 deletions
diff --git a/scripts/external_libs/dpkt-1.8.6/dpkt/ppp.py b/scripts/external_libs/dpkt-1.8.6/dpkt/ppp.py
new file mode 100644
index 00000000..f4898b95
--- /dev/null
+++ b/scripts/external_libs/dpkt-1.8.6/dpkt/ppp.py
@@ -0,0 +1,63 @@
+# $Id: ppp.py 65 2010-03-26 02:53:51Z dugsong $
+
+"""Point-to-Point Protocol."""
+
+import struct
+import dpkt
+
+# XXX - finish later
+
+# http://www.iana.org/assignments/ppp-numbers
+PPP_IP	= 0x21		# Internet Protocol
+PPP_IP6 = 0x57		# Internet Protocol v6
+
+# Protocol field compression
+PFC_BIT	= 0x01
+
+class PPP(dpkt.Packet):
+    __hdr__ = (
+        ('p', 'B', PPP_IP),
+        )
+    _protosw = {}
+    
+    def set_p(cls, p, pktclass):
+        cls._protosw[p] = pktclass
+    set_p = classmethod(set_p)
+
+    def get_p(cls, p):
+        return cls._protosw[p]
+    get_p = classmethod(get_p)
+    
+    def unpack(self, buf):
+        dpkt.Packet.unpack(self, buf)
+        if self.p & PFC_BIT == 0:
+            self.p = struct.unpack('>H', buf[:2])[0]
+            self.data = self.data[1:]
+        try:
+            self.data = self._protosw[self.p](self.data)
+            setattr(self, self.data.__class__.__name__.lower(), self.data)
+        except (KeyError, struct.error, dpkt.UnpackError):
+            pass
+
+    def pack_hdr(self):
+        try:
+            if self.p > 0xff:
+                return struct.pack('>H', self.p)
+            return dpkt.Packet.pack_hdr(self)
+        except struct.error, e:
+            raise dpkt.PackError(str(e))
+
+def __load_protos():
+    g = globals()
+    for k, v in g.iteritems():
+        if k.startswith('PPP_'):
+            name = k[4:]
+            modname = name.lower()
+            try:
+                mod = __import__(modname, g)
+            except ImportError:
+                continue
+            PPP.set_p(v, getattr(mod, name))
+
+if not PPP._protosw:
+    __load_protos()