Unit ARP
From Ultibo.org
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Contents
Description
Ultibo ARP (Address Resolution Protocol) unit
Constants
ARP specific constants
ARP_TRANSPORT_*, RARP_TRANSPORT_* ARP_TRANSPORT_NAME = 'ARP';
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RARP_TRANSPORT_NAME = 'RARP';
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ARP and RARP constants
MIN_*, MAX_*, ARP_*, RARP_* MIN_ARP_PACKET = 46;
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Not Counting Adapter Header |
MAX_ARP_PACKET = 46;
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Not Counting Adapter Header |
ARP_TIMEOUT = 1000;
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We wait for 1 second approx for reply |
ARP_RETRIES = 4;
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We try the request 4 times |
RARP_TIMEOUT = 4000;
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We wait for 4 seconds for a RARP reply |
RARP_RETRIES = 4;
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We try the request 4 times |
ARP_HEADER_SIZE = 46;
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SizeOf(TARPHeader); |
RARP_HEADER_SIZE = 46;
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SizeOf(TRARPHeader); |
ARP and RARP messages
ARP_*, RARP_*, INARP_* ARP_REQUEST = $0001;
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ARP/RARP op codes, Request |
ARP_REPLY = $0002;
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ARP/RARP op codes, Reply |
RARP_REQUEST = $0003;
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RARP_REPLY = $0004;
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INARP_REQUEST = $0008;
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Inverse ARP see RFC 1293 |
INARP_REPLY = $0009;
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Type definitions
ARP specific types
PARPHeader = ^TARPHeader;
TARPHeader = packed record
| Note: 46 Bytes | |
HardwareType:Word;
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Hardware address space (Network Order) |
ProtocolType:Word;
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Protocol address space (Network Order) |
HardwareLength:Byte;
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Byte length of hardware address |
ProtocolLength:Byte;
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Byte length of each protocol address |
Opcode:Word;
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Op code (eg ARP_REQUEST or ARP_REPLY) (Network Order) |
SourceHardware:THardwareAddress;
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Source hardware address (of sender) |
SourceIP:TInAddr;
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Source protocol address (of sender) (Network Order) |
TargetHardware:THardwareAddress;
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Target hardware address (if known) |
TargetIP:TInAddr;
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Target protocol address (Network Order) |
Reserved:array[0..17] of Word;
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RARP specific types
PRARPHeader = ^TRARPHeader;
TRARPHeader = TARPHeader;
| Note: 46 Bytes | |
Class definitions
ARP specific classes
TARPTransportAdapter = class(TTransportAdapter)
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TARPTransport = class(TNetworkTransport)
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TARPAddressEntry = class(TAddressEntry)
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TRARPTransportAdapter = class(TTransportAdapter)
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TRARPTransport = class(TNetworkTransport)
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TRARPAddressEntry = class(TAddressEntry)
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Public variables
None defined
Function declarations
Initialization functions
procedure ARPInit;
Description: To be documented
| Note | None documented |
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ARP functions
function CheckARP(ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid ARP packet
| Buffer | Buffer points to the complete packet without Adapter header |
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function CheckRARP(ABuffer:Pointer):Boolean;
Description: Verify that the packet is a valid RARP packet
| Buffer | Buffer points to the complete packet without Adapter header |
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