diff options
Diffstat (limited to 'external/construct/protocols/layer3/dhcpv4.py')
| -rw-r--r-- | external/construct/protocols/layer3/dhcpv4.py | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/external/construct/protocols/layer3/dhcpv4.py b/external/construct/protocols/layer3/dhcpv4.py new file mode 100644 index 0000000..f39bc97 --- /dev/null +++ b/external/construct/protocols/layer3/dhcpv4.py @@ -0,0 +1,212 @@ +""" +Dynamic Host Configuration Protocol for IPv4 + +http://www.networksorcery.com/enp/protocol/dhcp.htm +http://www.networksorcery.com/enp/protocol/bootp/options.htm +""" +from construct import * +from ipv4 import IpAddress +from binascii import unhexlify +import six + + +dhcp_option = Struct("dhcp_option", + Enum(Byte("code"), + Pad = 0, + Subnet_Mask = 1, + Time_Offset = 2, + Router = 3, + Time_Server = 4, + Name_Server = 5, + Domain_Name_Server = 6, + Log_Server = 7, + Quote_Server = 8, + LPR_Server = 9, + Impress_Server = 10, + Resource_Location_Server = 11, + Host_Name = 12, + Boot_File_Size = 13, + Merit_Dump_File = 14, + Domain_Name = 15, + Swap_Server = 16, + Root_Path = 17, + Extensions_Path = 18, + IP_Forwarding_enabledisable = 19, + Nonlocal_Source_Routing_enabledisable = 20, + Policy_Filter = 21, + Maximum_Datagram_Reassembly_Size = 22, + Default_IP_TTL = 23, + Path_MTU_Aging_Timeout = 24, + Path_MTU_Plateau_Table = 25, + Interface_MTU = 26, + All_Subnets_are_Local = 27, + Broadcast_Address = 28, + Perform_Mask_Discovery = 29, + Mask_supplier = 30, + Perform_router_discovery = 31, + Router_solicitation_address = 32, + Static_routing_table = 33, + Trailer_encapsulation = 34, + ARP_cache_timeout = 35, + Ethernet_encapsulation = 36, + Default_TCP_TTL = 37, + TCP_keepalive_interval = 38, + TCP_keepalive_garbage = 39, + Network_Information_Service_domain = 40, + Network_Information_Servers = 41, + NTP_servers = 42, + Vendor_specific_information = 43, + NetBIOS_over_TCPIP_name_server = 44, + NetBIOS_over_TCPIP_Datagram_Distribution_Server = 45, + NetBIOS_over_TCPIP_Node_Type = 46, + NetBIOS_over_TCPIP_Scope = 47, + X_Window_System_Font_Server = 48, + X_Window_System_Display_Manager = 49, + Requested_IP_Address = 50, + IP_address_lease_time = 51, + Option_overload = 52, + DHCP_message_type = 53, + Server_identifier = 54, + Parameter_request_list = 55, + Message = 56, + Maximum_DHCP_message_size = 57, + Renew_time_value = 58, + Rebinding_time_value = 59, + Class_identifier = 60, + Client_identifier = 61, + NetWareIP_Domain_Name = 62, + NetWareIP_information = 63, + Network_Information_Service_Domain = 64, + Network_Information_Service_Servers = 65, + TFTP_server_name = 66, + Bootfile_name = 67, + Mobile_IP_Home_Agent = 68, + Simple_Mail_Transport_Protocol_Server = 69, + Post_Office_Protocol_Server = 70, + Network_News_Transport_Protocol_Server = 71, + Default_World_Wide_Web_Server = 72, + Default_Finger_Server = 73, + Default_Internet_Relay_Chat_Server = 74, + StreetTalk_Server = 75, + StreetTalk_Directory_Assistance_Server = 76, + User_Class_Information = 77, + SLP_Directory_Agent = 78, + SLP_Service_Scope = 79, + Rapid_Commit = 80, + Fully_Qualified_Domain_Name = 81, + Relay_Agent_Information = 82, + Internet_Storage_Name_Service = 83, + NDS_servers = 85, + NDS_tree_name = 86, + NDS_context = 87, + BCMCS_Controller_Domain_Name_list = 88, + BCMCS_Controller_IPv4_address_list = 89, + Authentication = 90, + Client_last_transaction_time = 91, + Associated_ip = 92, + Client_System_Architecture_Type = 93, + Client_Network_Interface_Identifier = 94, + Lightweight_Directory_Access_Protocol = 95, + Client_Machine_Identifier = 97, + Open_Group_User_Authentication = 98, + Autonomous_System_Number = 109, + NetInfo_Parent_Server_Address = 112, + NetInfo_Parent_Server_Tag = 113, + URL = 114, + Auto_Configure = 116, + Name_Service_Search = 117, + Subnet_Selection = 118, + DNS_domain_search_list = 119, + SIP_Servers_DHCP_Option = 120, + Classless_Static_Route_Option = 121, + CableLabs_Client_Configuration = 122, + GeoConf = 123, + ), + Switch("value", lambda ctx: ctx.code, + { + # codes without any value + "Pad" : Pass, + }, + # codes followed by length and value fields + default = Struct("value", + Byte("length"), + Field("data", lambda ctx: ctx.length), + ) + ) +) + +dhcp_header = Struct("dhcp_header", + Enum(Byte("opcode"), + BootRequest = 1, + BootReply = 2, + ), + Enum(Byte("hardware_type"), + Ethernet = 1, + Experimental_Ethernet = 2, + ProNET_Token_Ring = 4, + Chaos = 5, + IEEE_802 = 6, + ARCNET = 7, + Hyperchannel = 8, + Lanstar = 9, + ), + Byte("hardware_address_length"), + Byte("hop_count"), + UBInt32("transaction_id"), + UBInt16("elapsed_time"), + BitStruct("flags", + Flag("boardcast"), + Padding(15), + ), + IpAddress("client_addr"), + IpAddress("your_addr"), + IpAddress("server_addr"), + IpAddress("gateway_addr"), + IpAddress("client_addr"), + Bytes("client_hardware_addr", 16), + Bytes("server_host_name", 64), + Bytes("boot_filename", 128), + # BOOTP/DHCP options + # "The first four bytes contain the (decimal) values 99, 130, 83 and 99" + Const(Bytes("magic", 4), six.b("\x63\x82\x53\x63")), + Rename("options", OptionalGreedyRange(dhcp_option)), +) + + +if __name__ == "__main__": + test = unhexlify(six.b( + "01" "01" "08" "ff" "11223344" "1234" "0000" + "11223344" "aabbccdd" "11223444" "aabbccdd" "11223344" + + "11223344556677889900aabbccddeeff" + + "41414141414141414141414141414141" "41414141414141414141414141414141" + "41414141414141414141414141414141" "41414141414141414141414141414141" + + "42424242424242424242424242424242" "42424242424242424242424242424242" + "42424242424242424242424242424242" "42424242424242424242424242424242" + "42424242424242424242424242424242" "42424242424242424242424242424242" + "42424242424242424242424242424242" "42424242424242424242424242424242" + + "63825363" + + "0104ffffff00" + "00" + "060811223344aabbccdd" + )) + + print (dhcp_header.parse(test)) + + + + + + + + + + + + + + |