Unit ICMP
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Contents
Description
Ultibo ICMP (Internet Control Message Protocol) unit
Constants
ICMP_PROTOCOL_* | Note: Some ICMP definitions are in the Protocol or IP modules | |
ICMP_PROTOCOL_NAME = 'ICMP';
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ICMP_* ICMP_TIMEOUT = 0;
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Wait forever on a ICMP Read |
ICMP_BUFFER_SIZE = 65536;
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ICMP Receive Buffer Size |
ICMP_HEADER_SIZE = 8;
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SizeOf(TICMPHeader); ICMP.Solicit |
ICMP_PACKET_SIZE = 8;
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SizeOf(TICMPPacket) |
ICMP_ROUTER_TIMEOUT = 60000;
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Type definitions
ICMP unused header
PICMPUnusedHeader = ^TICMPUnusedHeader;
TICMPUnusedHeader = packed record {Unreachable, TimeExceeded, SourceQuench etc}
| Note: Some ICMP definitions are in the Protocol or IP modules | |
ICMPType:Byte;
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ICMP_UNREACH etc |
Code:Byte;
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ICMP_UNREACH_NET,ICMP_UNREACH_PORT etc |
Checksum:Word;
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1s Compliment checksum of Structure |
Unused:LongWord;
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4 Bytes Unused Must be Zero |
IP:TIPHeader;
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IP Header from Original IP Packet |
Data:array[0..7] of Byte;
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8 Bytes of Original IP Packet Data |
ICMP unreach header
PICMPUnreachHeader = ^TICMPUnreachHeader;
TICMPUnreachHeader = TICMPUnusedHeader;
| Note: ICMP_UNREACH | |
ICMP expire header
PICMPExpireHeader = ^TICMPExpireHeader;
TICMPExpireHeader = TICMPUnusedHeader;
| Note: ICMP_TIMXCEED | |
ICMP quench header
PICMPQuenchHeader = ^TICMPQuenchHeader;
TICMPQuenchHeader = TICMPUnusedHeader;
| Note: ICMP_SOURCEQUENCH | |
ICMP pointer header
PICMPPointerHeader = ^TICMPPointerHeader;
TICMPPointerHeader = packed record
| Note: Param Problem | |
ICMPType:Byte;
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ICMP_PARAMPROB etc |
Code:Byte;
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ICMP_PARAMPROB_OPTABSENT etc |
Checksum:Word;
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1s Compliment checksum of Structure |
Pointer:Byte;
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If Code = 0 Pointer to Byte where Error Occured |
Unused:array[0..2] of Byte;
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3 Bytes Unused Must be Zero |
IP:TIPHeader;
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IP Header from Original IP Packet |
Data:array[0..7] of Byte;
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8 Bytes of Original IP Packet Data |
ICMP param header
PICMPParamHeader = ^TICMPParamHeader;
TICMPParamHeader = TICMPPointerHeader;
| Note: ICMP_PARAMPROB | |
ICMP IP header
PICMPIpHeader = ^TICMPIpHeader;
TICMPIpHeader = packed record
| Note: Redirect | |
ICMPType:Byte;
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ICMP_REDIRECT etc |
Code:Byte;
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ICMP_REDIRECT_NET,ICMP_REDIRECT_HOST etc |
Checksum:Word;
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1s Compliment checksum of Structure |
Gateway:TInAddr;
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Redirect Gateway Address |
IP:TIPHeader;
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IP Header from Original IP Packet |
Data:array[0..7] of Byte;
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8 Bytes of Original IP Packet Data |
ICMP redirect header
PICMPRedirectHeader = ^TICMPRedirectHeader;
TICMPRedirectHeader = TICMPIpHeader
| Note: ICMP_REDIRECT | |
ICMP echo header
PICMPEchoHeader = ^TICMPEchoHeader;
TICMPEchoHeader = packed record
| Note: Echo Request/Reply | |
ICMPType:Byte;
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ICMP_ECHO,ICMP_ECHOREPLY |
Code:Byte;
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Always 0 |
Checksum:Word;
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1s Compliment checksum of Structure |
Identifier:Word;
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Increments with each ICMP_ECHO |
Sequence:Word;
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Sequence within an ICMP_ECHO set |
Data:array[0..((MAX_IP_PACKET - 1) - SizeOf(TIPHeader)) - 8] of Byte;
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ICMP time stamp header
PICMPTimestampHeader = ^TICMPTimestampHeader;
TICMPTimestampHeader = packed record
| Note: Timestamp Request/Reply | |
ICMPType:Byte;
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ICMP_TSTAMP,ICMP_TSTAMPREPLY |
Code:Byte;
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Always 0 |
Checksum:Word;
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1s Compliment checksum of Structure |
Identifier:Word;
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Increments with each ICMP_TSTAMP |
Sequence:Word;
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Sequence within an ICMP_TSTAMP set |
Original:LongWord;
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Original Timestamp |
Receive:LongWord;
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Receive Timestamp |
Transmit:LongWord;
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Transmit Timestamp (A sort of Round Trip Time Echo) |
ICMP info header
PICMPInfoHeader = ^TICMPInfoHeader;
TICMPInfoHeader = packed record
| Note: Info Request/Reply | |
ICMPType:Byte;
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ICMP_IREQ,ICMP_IREQREPLY |
Code:Byte;
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Always 0 |
Checksum:Word;
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1s Compliment checksum of Structure |
Identifier:Word;
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Increments with each ICMP_IREQ |
Sequence:Word;
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Sequence within an ICMP_IREQ set (Used to determine Network Number of Local Subnet) |
ICMP mask header
PICMPMaskHeader = ^TICMPMaskHeader;
TICMPMaskHeader = packed record
| Note: Mask Request/Reply | |
ICMPType:Byte;
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ICMP_MASKREQ,ICMP_MASKREPLY |
Code:Byte;
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Always 0 |
Checksum:Word;
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1s Compliment checksum of Structure |
Identifier:Word;
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Increments with each ICMP_MASKREQ |
Sequence:Word;
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Sequence within an ICMP_MASKREQ set |
Mask:TInAddr;
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Subnet Mask of Local Subnet (Used to determine Subnet Mask of Local Subnet) |
ICMP router address
PICMPRouterAddress = ^TICMPRouterAddress;
TICMPRouterAddress = packed record
Address:TInAddr;
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The address of the Router on this subnet |
Level:LongInt;
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The level of preference, higher is better |
ICMP advert header
PICMPAdvertHeader = ^TICMPAdvertHeader;
TICMPAdvertHeader = packed record
ICMPType:Byte;
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ICMP_ROUTERADVERT |
Code:Byte;
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Always 0 |
Checksum:Word;
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1s Compliment checksum of Structure |
EntryCount:Byte;
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Number of Router Address entries |
EntrySize:Byte;
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Size of each Router Address entry |
Lifetime:Word;
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Lifetime of entries in seconds |
Routers:array[1..EntryCount] of TICMPRouterAddress;
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Used to advertise routers |
ICMP solicit header
PICMPSolicitHeader = ^TICMPSolicitHeader;
TICMPSolicitHeader = packed record
ICMPType:Byte;
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ICMP_ROUTERSOLICIT |
Code:Byte;
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Always 0 |
Checksum:Word;
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1s Compliment checksum of Structure |
Reserved:LongWord;
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Always 0 (Used to solicit routers) |
ICMP header
PICMPHeader = ^TICMPHeader;
TICMPHeader = packed record
case Integer of
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0:(Unused:TICMPUnusedHeader);
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1:(Unreach:TICMPUnreachHeader);
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2:(Expire:TICMPExpireHeader);
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3:(Quench:TICMPQuenchHeader);
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4:(Pointer:TICMPPointerHeader);
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5:(Param:TICMPParamHeader);
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6:(Ip:TICMPIpHeader);
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7:(Redirect:TICMPRedirectHeader);
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8:(Echo:TICMPEchoHeader);
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9:(Timestamp:TICMPTimestampHeader);
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10:(Info:TICMPInfoHeader);
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11:(Mask:TICMPMaskHeader);
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12:(Advert:TICMPAdvertHeader);
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13:(Solicit:TICMPSolicitHeader);
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ICMP packet
PICMPPacket = ^TICMPPacket;
TICMPPacket = record
| Note: 8 Bytes (Used by ICMPBuffer) | |
Size:LongWord;
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LongWord to keep size even |
Next:PICMPPacket;
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Followed by RemoteAddress (4 or 16 Bytes) |
Class definitions
ICMP specific classes
TICMPProtocolTransport = class(TProtocolTransport)
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TICMPProtocol = class(TNetworkProtocol)
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TICMPSocket = class(TProtocolSocket)
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TICMPBuffer = class(TSocketBuffer)
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Public variables
None defined
Function declarations
Initialization functions
procedure ICMPInit;
| Note | None documented |
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ICMP functions
function CheckICMP(AFamily:Word; ABuffer:Pointer):Boolean;
| Buffer | The complete packet including Transport header |
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function GetICMPHeaderOffset(AFamily:Word; ABuffer:Pointer):Word;
| Buffer | The complete packet including Transport header |
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function GetICMPHeaderLength(AFamily:Word; ABuffer:Pointer):Word;
| Buffer | The complete packet including Transport header |
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function GetICMPDataOffset(AFamily:Word; ABuffer:Pointer):Word;
| Buffer | The complete packet including Transport header |
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function GetICMPDataLength(AFamily:Word; ABuffer:Pointer):Word;
| Buffer | The complete packet including Transport header |
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function ChecksumICMP(AFamily:Word; ABuffer:Pointer; AOffset,ALength:Word):Word;
| Note | None documented |
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