mirror of
https://github.com/Oibaf66/frodo-wii.git
synced 2024-09-21 14:40:41 +02:00
277 lines
8.4 KiB
Python
277 lines
8.4 KiB
Python
import socket, struct, syslog
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import SocketServer
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FRODO_NETWORK_MAGIC = 0x1976
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CONNECT_TO_BROKER = 99 # Hello, broker
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LIST_PEERS = 98 # List of peers
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CONNECT_TO_PEER = 97 # A peer wants to connect
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SELECT_PEER = 93 # The client selects who to connect to
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DISCONNECT = 96 # Disconnect from a peer
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PING = 95 # Are you alive?
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ACK = 94 # Yep
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STOP = 55 # No more packets
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def log(pri, msg, echo):
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syslog.syslog(pri, msg)
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# if echo:
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print msg
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def log_error(msg, echo = False):
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log(syslog.LOG_ERR, msg, echo)
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def log_warn(msg, echo = False):
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log(syslog.LOG_WARNING, msg, echo)
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def log_info(msg, echo = False):
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log(syslog.LOG_INFO, msg, echo)
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class Packet:
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def __init__(self):
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"""Create a new packet"""
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self.magic = FRODO_NETWORK_MAGIC
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self.type = 0
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self.size = 8
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def demarshal_from_data(self, data):
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"""Create a new packet from raw data. Data should always be in network
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byte order"""
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self.magic = struct.unpack(">H", data[0:2])[0]
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self.type = struct.unpack(">H", data[2:4])[0]
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self.size = struct.unpack(">L", data[4:8])[0]
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def get_magic(self):
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return self.magic
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def get_type(self):
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return self.type
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def get_size(self):
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return self.size
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def marshal(self):
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return struct.pack(">HHL", self.magic, self.type, self.size)
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class StopPacket(Packet):
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def __init__(self):
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Packet.__init__(self)
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self.type = STOP
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class SelectPeerPacket(Packet):
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def __init__(self):
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Packet.__init__(self)
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self.type = SELECT_PEER
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self.server_id = 0
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def demarshal_from_data(self, data):
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"""Create a new packet from raw data."""
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Packet.demarshal_from_data(self, data)
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self.server_id = struct.unpack(">L", data[8:12])[0]
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def get_id(self):
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return self.server_id
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class ConnectToBrokerPacket(Packet):
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def __init__(self):
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self.key = 0
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self._is_master = 0
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self.private_port = 0
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self.public_port = 0
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self.private_ip = ""
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self.public_ip = ""
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self.type = CONNECT_TO_BROKER
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self.name = ""
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self.serverid = 0
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def demarshal_from_data(self, data):
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Packet.demarshal_from_data(self, data)
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self.key = struct.unpack(">H", data[44:46])[0]
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self._is_master = struct.unpack(">H", data[46:48])[0]
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self.name = struct.unpack(">32s", data[48:48+32])[0]
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def get_key(self):
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return self.key
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def get_name(self):
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return self.name
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def is_master(self):
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return self._is_master
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class ListPeersPacket(Packet):
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def __init__(self):
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Packet.__init__(self)
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self.n_peers = 0
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self.peers = []
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self.type = LIST_PEERS
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self.size = self.size + 24
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def add_peer(self, peer):
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self.peers.append(peer)
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self.n_peers = self.n_peers + 1
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self.size = self.size + 76
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def marshal(self):
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out = struct.pack(">L16sHxx", self.n_peers, "", 0)
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for peer in self.peers:
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out = out + struct.pack(">HH16s16sHH32sL",
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0, peer.public_port, "",
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peer.public_ip, peer.key,
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peer.is_master, peer.name,
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peer.id)
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return Packet.marshal(self) + out
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class Peer:
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def __init__(self, addr, srv, id):
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self.srv = srv
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self.addr = addr
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self.public_ip, self.public_port = self.addr_to_ip_and_port(addr)
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# These will be set by the CONNECT_TO_BROKER packet below
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self.key = 0
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self.name = ""
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self.is_master = 0
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self.id = id
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def addr_to_ip_and_port(self, addr):
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ip = struct.unpack("@L", socket.inet_pton(socket.AF_INET, addr[0]))[0]
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port = addr[1]
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return "%08x" % (ip), port
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def handle_packet(self, pkt):
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if pkt.type == CONNECT_TO_BROKER:
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self.key = pkt.get_key()
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self.name = pkt.get_name()
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self.is_master = pkt.is_master()
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# Send list of peers if this is not a master
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if not self.is_master:
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lp = ListPeersPacket()
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for peer in self.srv.peers.itervalues():
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if peer != self and peer.is_master:
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lp.add_peer(peer)
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# And send the packet to this peer
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log_info("Sending list of peers (%d) to %s:%d" % (lp.n_peers,
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self.addr[0], self.addr[1]) )
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self.send_packet(lp.marshal())
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if pkt.type == SELECT_PEER:
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peer = self.srv.get_peer_by_id( pkt.get_id() )
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# Tell the peer that we have connected
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lp = ListPeersPacket()
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lp.add_peer(self)
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log_info("Sending list of peers for peer selected to %s:%d" % (
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self.addr[0], self.addr[1]))
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peer.send_packet( lp.marshal() )
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# These two are no longer needed
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self.srv.remove_peer(peer)
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self.srv.remove_peer(self)
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def send_packet(self, data):
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self.srv.socket.sendto(data + StopPacket().marshal(),
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0, self.addr)
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def __str__(self):
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return '%s:%d "%s" %d %d' % (self.public_ip, self.public_port,
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self.name, self.key, self.is_master)
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class BrokerPacketHandler(SocketServer.DatagramRequestHandler):
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def get_packet_from_data(self, data):
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magic = struct.unpack(">H", data[0:2])[0]
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type = struct.unpack(">H", data[2:4])[0]
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if magic != FRODO_NETWORK_MAGIC:
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raise Exception("Packet magic does not match: %4x vs %4x\n" % (magic,
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FRODO_NETWORK_MAGIC) )
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try:
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out = packet_class_by_type[type]()
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out.demarshal_from_data(data)
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return out
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except KeyError, e:
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raise Exception("Unknown packet type %d" % (type))
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def handle(self):
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srv = self.server
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data = self.rfile.read()
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try:
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pkt = self.get_packet_from_data(data)
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except Exception, e:
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log_error("Broken packet: %s" % e)
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return
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log_info("Received packet %d from %s:%d" % (pkt.get_type(), self.client_address[0],
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self.client_address[1]))
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peer = srv.get_peer(self.client_address)
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try:
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peer.handle_packet(pkt)
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except Exception, e:
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# Sends crap, let's remove it
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log_error("Handling packet failed, removing peer: %s" % e)
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srv.remove_peer(peer)
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class Broker(SocketServer.UDPServer):
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def __init__(self, host, req_handler):
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SocketServer.UDPServer.__init__(self, host, req_handler)
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# Instead of setsockopt( ... REUSEADDR ... )
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self.allow_reuse_address = True
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self.peers = {}
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self.peers_by_id = {}
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self.id = 0
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def send_data(self, dst, data):
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self.socket.sendto(data, dst)
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def get_peer(self, key):
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"Return the peer for a certain key, or a new one if it doesn't exist"
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try:
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peer = self.peers[key]
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except KeyError, e:
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peer = Peer(key, self, self.id)
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self.peers[key] = peer
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self.peers_by_id[self.id] = peer
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self.id = self.id + 1
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return peer
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def get_peer_by_id(self, id):
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return self.peers_by_id[id]
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def get_peer_by_name_key(self, name, key):
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for k,v in self.peers.iteritems():
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if name == v.get_name() and key == v.get_key():
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return v
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return None
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def remove_peer(self, peer):
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try:
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del self.peers[ peer.addr ]
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del self.peers_by_id[ peer.id ]
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except:
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log_error("Could not remove %s, something is wrong" % (str(peer.addr)))
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# Some of the Frodo network packets. There are more packets, but these
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# are not interesting to the broker (and shouldn't be sent there either!)
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packet_class_by_type = {
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CONNECT_TO_BROKER : ConnectToBrokerPacket,
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SELECT_PEER : SelectPeerPacket,
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}
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if __name__ == "__main__":
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syslog.openlog("frodo")
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log_info("Starting Frodo network broker", True)
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s = Broker( ("", 46214), BrokerPacketHandler)
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s.serve_forever()
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