host: Add MagicPacket class

src/rouse/host.py

@@ -207,3 +207,30 @@ class Host(object):
             else:
                 host.hostname = ni[0]
         return host
+
+
+class MagicPacket(object):
+
+    def __init__(self, macaddr):
+        self.macaddr = MacAddress(macaddr)
+
+    @property
+    def payload(self):
+        payload = bytearray((0xff,) * 6)
+        payload += struct.pack(str('>Q'), self.macaddr.value)[-6:] * 16
+        return bytes(payload)
+
+    def send(self, ipaddr='255.255.255.255', port=9):
+        ai = socket.getaddrinfo(ipaddr, port, socket.AF_UNSPEC,
+                                socket.SOCK_DGRAM)
+        for af, socktype, __, __, addr in ai:
+            s = None
+            try:
+                s = socket.socket(af, socktype)
+                s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+                s.sendto(self.payload, addr)
+            except:
+                continue
+            finally:
+                if s is not None:
+                    s.close()