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''' IPv4 DHCP socket ================ ''' from pyroute2.common import AddrPool from pyroute2.dhcp.dhcp4msg import dhcp4msg from pyroute2.ext.rawsocket import RawSocket from pyroute2.protocols import ethmsg, ip4msg, udp4_pseudo_header, udpmsg def listen_udp_port(port=68): # pre-scripted BPF code that matches UDP port bpf_code = [ [40, 0, 0, 12], [21, 0, 8, 2048], [48, 0, 0, 23], [21, 0, 6, 17], [40, 0, 0, 20], [69, 4, 0, 8191], [177, 0, 0, 14], [72, 0, 0, 16], [21, 0, 1, port], [6, 0, 0, 65535], [6, 0, 0, 0], ] return bpf_code class DHCP4Socket(RawSocket): ''' Parameters: * ifname -- interface name to work on This raw socket binds to an interface and installs BPF filter to get only its UDP port. It can be used in poll/select and provides also the context manager protocol, so can be used in `with` statements. It does not provide any DHCP state machine, and does not inspect DHCP packets, it is totally up to you. No default values are provided here, except `xid` -- DHCP transaction ID. If `xid` is not provided, DHCP4Socket generates it for outgoing messages. ''' def __init__(self, ifname, port=68): RawSocket.__init__(self, ifname, listen_udp_port(port)) self.port = port # Create xid pool # # Every allocated xid will be released automatically after 1024 # alloc() calls, there is no need to call free(). Minimal xid == 16 self.xid_pool = AddrPool(minaddr=16, release=1024) def __enter__(self): return self def __exit__(self, exc_type, exc_value, traceback): self.close() def put(self, msg=None, dport=67): ''' Put DHCP message. Parameters: * msg -- dhcp4msg instance * dport -- DHCP server port If `msg` is not provided, it is constructed as default BOOTREQUEST + DHCPDISCOVER. Examples:: sock.put(dhcp4msg({'op': BOOTREQUEST, 'chaddr': 'ff:11:22:33:44:55', 'options': {'message_type': DHCPREQUEST, 'parameter_list': [1, 3, 6, 12, 15], 'requested_ip': '172.16.101.2', 'server_id': '172.16.101.1'}})) The method returns dhcp4msg that was sent, so one can get from there `xid` (transaction id) and other details. ''' # DHCP layer dhcp = msg or dhcp4msg({'chaddr': self.l2addr}) # dhcp transaction id if dhcp['xid'] is None: dhcp['xid'] = self.xid_pool.alloc() data = dhcp.encode().buf # UDP layer udp = udpmsg( {'sport': self.port, 'dport': dport, 'len': 8 + len(data)} ) udph = udp4_pseudo_header( {'dst': '255.255.255.255', 'len': 8 + len(data)} ) udp['csum'] = self.csum(udph.encode().buf + udp.encode().buf + data) udp.reset() # IPv4 layer ip4 = ip4msg( {'len': 20 + 8 + len(data), 'proto': 17, 'dst': '255.255.255.255'} ) ip4['csum'] = self.csum(ip4.encode().buf) ip4.reset() # MAC layer eth = ethmsg( {'dst': 'ff:ff:ff:ff:ff:ff', 'src': self.l2addr, 'type': 0x800} ) data = eth.encode().buf + ip4.encode().buf + udp.encode().buf + data self.send(data) dhcp.reset() return dhcp def get(self): ''' Get the next incoming packet from the socket and try to decode it as IPv4 DHCP. No analysis is done here, only MAC/IPv4/UDP headers are stripped out, and the rest is interpreted as DHCP. ''' (data, addr) = self.recvfrom(4096) eth = ethmsg(buf=data).decode() ip4 = ip4msg(buf=data, offset=eth.offset).decode() udp = udpmsg(buf=data, offset=ip4.offset).decode() return dhcp4msg(buf=data, offset=udp.offset).decode()