Unit DHCP
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[hide]Description
Ultibo DHCP/BOOTP Protocol client unit
To be documented
Constants
[Expand]
DHCP specific constants
BOOTP_* BOOTP_DELAY = 1000;
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(Previously 0) |
BOOTP_TIMEOUT = 8000;
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(Previously 4000) We wait for 8 seconds for a BOOTP reply |
BOOTP_RETRIES = 6;
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(Previously 4) Try the request 6 times |
BOOTP_MIN_DELAY = 0;
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BOOTP_MAX_DELAY = 10000;
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BOOTP_MIN_TIMEOUT = 500;
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BOOTP_MAX_TIMEOUT = 15000;
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BOOTP_MIN_RETRIES = 1;
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BOOTP_MAX_RETRIES = 100;
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DHCP_DELAY = 1000;
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(Previously 0) |
DHCP_TIMEOUT = 8000;
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(Previously 4000) We wait for 8 seconds for a DHCP reply |
DHCP_RETRIES = 6;
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(Previously 4) Try the request 6 times |
DHCP_MIN_DELAY = 0;
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DHCP_MAX_DELAY = 10000;
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DHCP_MIN_TIMEOUT = 500;
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DHCP_MAX_TIMEOUT = 15000;
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DHCP_MIN_RETRIES = 1;
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DHCP_MAX_RETRIES = 100;
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BOOTP_VENDOR_SIZE = 64;
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Size of the Vendor area |
DHCP_OPTIONS_SIZE = 312;
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Size of the Options area |
DHCP_MESSAGE_SIZE = 576;
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Size of the max message |
[Expand]
DHCP message
DHCP_* DHCP_DISCOVER = 1;
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DHCP_OFFER = 2;
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DHCP_REQUEST = 3;
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DHCP_DECLINE = 4;
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DHCP_ACK = 5;
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DHCP_NAK = 6;
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DHCP_RELEASE = 7;
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DHCP_INFORM = 8;
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DHCP_RENEWAL_TO = 1;
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DHCP_REBIND_TO = 2;
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[Expand]
BOOTP/DHCP options
PAD_OPT = 0;
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END_OPT = 255;
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SUBNET_MASK = 1;
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TIME_OFFSET = 2;
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ROUTERS_ON_SNET = 3;
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TIME_SRV = 4;
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NAME_SRV = 5;
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DNS_SRV = 6;
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LOG_SRV = 7;
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COOKIE_SRV = 8;
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LPR_SRV = 9;
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IMPRESS_SRV = 10;
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RES_LOCATION_SRV = 11;
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HOST_NAME = 12;
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BOOT_FSIZE = 13;
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MERIT_DUMPFILE = 14;
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DOMAIN_NAME = 15;
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SWAP_SRV = 16;
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ROOT_PATH = 17;
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EXTENTIONS_PATH = 18;
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IP_FORWARDING = 19;
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NON_LOCAL_SRC_ROUTE = 20;
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POLICY_FILTER = 21;
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MAX_DGRAM_REASM_SIZE = 22;
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IP_DEFAULT_TTL = 23;
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PATH_MTU_AGING_TIMEOUT = 24;
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PATH_MTU_PLATEAU_TABLE = 25;
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IF_MTU = 26;
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ALL_SUBNETS_LOCAL = 27;
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BROADCAST_ADDR = 28;
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PERFORM_MASK_DISCOVERY = 29;
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MASK_SUPPLIER = 30;
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PERFORM_ROUTER_DISCOVERY = 31;
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ROUTER_SOLICITATION_ADDR = 32;
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STATIC_ROUTE = 33;
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TRAILER_ENCAPSULATION = 34;
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ARP_CACHE_TIMEOUT = 35;
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ETHERNET_ENCAPSULATION = 36;
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TCP_DEFAULT_TTL = 37;
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TCP_KEEPALIVE_INTERVAL = 38;
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TCP_KEEPALIVE_GARBAGE = 39;
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NIS_DOMAIN_NAME = 40;
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NIS_SRVS = 41;
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NTP_SRVS = 42;
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VENDOR_SPECIFIC_INFO = 43;
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NBIOS_NAME_SRV = 44;
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NBIOS_DGRAM_DIST_SRV = 45;
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NBIOS_NODE_TYPE = 46;
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NBIOS_SCOPE = 47;
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XFONT_SRV = 48;
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XDISPLAY_MANAGER = 49;
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| DHCP Options | |
DHCP_REQUESTED_IP_ADDR = 50;
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DHCP_IP_ADDR_LEASE_TIME = 51;
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DHCP_OPT_OVERLOAD = 52;
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DHCP_MSG_TYPE = 53;
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DHCP_SRV_IDENTIFIER = 54;
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DHCP_PARAM_REQUEST = 55;
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DHCP_MSG = 56;
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DHCP_MAX_MSG_SIZE = 57;
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DHCP_T1_VALUE = 58;
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DHCP_T2_VALUE = 59;
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DHCP_CLASS_ID = 60;
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DHCP_CLIENT_ID = 61;
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DHCP_NIS_DOMAIN_OPT = 64;
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DHCP_NIS_SRV_OPT = 65;
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DHCP_TFTP_SERVER = 66;
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DHCP_BOOT_FILENAME = 67;
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DHCP_MOBIP_HOME_AGENTS = 68;
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DHCP_SMTP_SRVS = 69;
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DHCP_POP3_SRVS = 70;
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DHCP_NNTP_SRVS = 71;
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DHCP_WWW_SRVS = 72;
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DHCP_FINGER_SRVS = 73;
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DHCP_IRC_SRVS = 74;
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DHCP_STREET_TALK_SRVS = 75;
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DHCP_STDA_SRVS = 76;
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[Expand]
ARP configuration
ARP_CONFIG_* ARP_CONFIG_START = $C0A86401;
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192.168.100.1 |
ARP_CONFIG_STOP = $C0A864FE;
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192.168.100.254 |
Type definitions
DHCP specific types
[Expand]
PBOOTPHeader = ^TBOOTPHeader;
TBOOTPHeader = packed record
Opcode:Byte;
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packet op code/message type |
HardwareType:Byte;
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hardware address type, 1 = 10 mb ethernet |
HardwareLength:Byte;
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hardware address len, eg '6' for 10mb eth |
Hops:Byte;
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client sets to zero, optionally used by gateways in cross-gateway booting |
Identifier:LongWord;
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transaction Id, a random number |
Seconds:Word;
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filled in by client, seconds elapsed since client started trying to boot |
Reserved:Word;
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ClientIP:TInAddr;
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client IP address filled in by client if known |
YourIP:TInAddr;
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'your' (client) IP address filled by server if client doesn't know |
ServerIP:TInAddr;
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server IP address returned in bootreply |
GatewayIP:TInAddr;
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gateway IP address, used in optional cross-gateway booting |
ClientHardware:array[0..15] of Byte;
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client hardware address, filled by client |
ClientHardware:THardwareAddress;
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client hardware address, filled by client |
DummyData:array[0..9] of Byte;
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dummy to fill out remaining bytes of above |
ServerName:array[0..63] of Byte;
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optional server host name, null terminated |
FileName:array[0..127] of Byte;
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boot file name, null terminated string 'generic' name or null in bootrequest, fully qualified directory-path name in bootreply |
VendorData:array[0..63] of Byte;
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optional vendor-specific area |
VendorData:array[0..BOOTP_VENDOR_SIZE - 1] of Byte;
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optional vendor-specific area |
DHCP header
[Expand]
PDHCPHeader = ^TDHCPHeader;
TDHCPHeader = packed record
Opcode:Byte;
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packet op code/message type |
HardwareType:Byte;
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hardware address type, 1 = 10 mb ethernet |
HardwareLength:Byte;
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hardware address len, eg '6' for 10mb eth |
Hops:Byte;
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client sets to zero, optionally used by gateways in cross-gateway booting |
Identifier:LongWord;
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transaction Id, a random number |
Seconds:Word;
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filled in by client, seconds elapsed since client started trying to boot |
Flags:Word;
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ClientIP:TInAddr;
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client IP address filled in by client if known |
YourIP:TInAddr;
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'your' (client) IP address filled by server if client doesn't know |
ServerIP:TInAddr;
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server IP address returned in bootreply |
GatewayIP:TInAddr;
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gateway IP address, used in optional cross-gateway booting |
ClientHardware:array[0..15] of Byte;
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client hardware address, filled by client |
ClientHardware:THardwareAddress;
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client hardware address, filled by client |
DummyData:array[0..9] of Byte;
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dummy to fill out remaining bytes of above |
ServerName:array[0..63] of Byte;
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optional server host name, null terminated |
FileName:array[0..127] of Byte;
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boot file name, null terminated string 'generic' name or null in bootrequest, fully qualified directory-path name in bootreply |
Options:array[0..311] of Byte;
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DHCP options area (minimum 312 bytes) |
Options:array[0..DHCP_OPTIONS_SIZE - 1] of Byte;
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DHCP options area (minimum 312 bytes) |
DHCP client Id
[Expand]
PDHCPClientId = ^TDHCPClientId;
TDHCPClientId = packed record
Tag:Byte;
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Hardware:THardwareAddress;
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Class definitions
DHCP configuration transport
DHCP configuration
[Expand]
TDHCPConfig = class(TNetworkConfig)
constructor Create(AManager:TProtocolManager);
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destructor Destroy; override;
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private
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FARP:TARPTransport;
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FUDP:TUDPProtocol;
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function ConfigHandler(AHandle:THandle; AAdapter:TTransportAdapter; ACommand:Word):Boolean;
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function GetDHCPClientId(AAdapter:TTransportAdapter):TDHCPClientId;
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function GetDHCPHeaderSize(AHeader:PDHCPHeader):Integer;
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function CreateDHCPRequest(AHeader:PDHCPHeader; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function CheckDHCPReply(AHeader:PDHCPHeader; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord):Boolean;
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function HandleDHCPReply(AHeader:PDHCPHeader; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; ACommand:Word):Boolean;
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function SendDHCPDiscover(ASocket:TProtocolSocket; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function SendDHCPRequest(ASocket:TProtocolSocket; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function SendDHCPDecline(ASocket:TProtocolSocket; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function SendDHCPRelease(ASocket:TProtocolSocket; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function SendDHCPInform(ASocket:TProtocolSocket; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function SendDHCPRenew(ASocket:TProtocolSocket; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function SendDHCPRebind(ASocket:TProtocolSocket; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function SendDHCPReboot(ASocket:TProtocolSocket; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function RecvDHCPReply(ASocket:TProtocolSocket; ATransport:TDHCPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACommand:Word):Boolean;
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function InsertDHCPOption(AOption:Byte; AHeader:PDHCPHeader; AValue:Pointer; ASize:Integer):Boolean;
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function ExtractDHCPOption(AOption:Byte; AHeader:PDHCPHeader; AValue:Pointer; var ASize:Integer):Boolean;
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protected
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public
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function AddTransport(ATransport:TNetworkTransport):Boolean; override;
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function RemoveTransport(ATransport:TNetworkTransport):Boolean; override;
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function StartConfig:Boolean; override;
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function StopConfig:Boolean; override;
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function ProcessConfig:Boolean; override;
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function SetConfig(AInitDelay,ARetryCount,ARetryTimeout:LongWord):Boolean; override;
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BOOTP configuration transport
BOOTP configuration
[Expand]
TBOOTPConfig = class(TNetworkConfig)
constructor Create(AManager:TProtocolManager);
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destructor Destroy; override;
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private
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FARP:TARPTransport;
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FUDP:TUDPProtocol;
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function ConfigHandler(AHandle:THandle; AAdapter:TTransportAdapter; ACommand:Word):Boolean;
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function CreateBOOTPRequest(AHeader:PBOOTPHeader; ATransport:TBOOTPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function CheckBOOTPReply(AHeader:PBOOTPHeader; ATransport:TBOOTPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord):Boolean;
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function HandleBOOTPReply(AHeader:PBOOTPHeader; ATransport:TBOOTPConfigTransport; AAdapter:TTransportAdapter):Boolean;
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function SendBOOTPRequest(ASocket:TProtocolSocket; ATransport:TBOOTPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord; ACount:Word):Boolean;
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function RecvBOOTPReply(ASocket:TProtocolSocket; ATransport:TBOOTPConfigTransport; AAdapter:TTransportAdapter; AIdentifier:LongWord):Boolean;
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function ExtractBOOTPOption(AOption:Byte; AHeader:PBOOTPHeader; AValue:Pointer; var ASize:Integer):Boolean;
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protected
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public
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function AddTransport(ATransport:TNetworkTransport):Boolean; override;
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function RemoveTransport(ATransport:TNetworkTransport):Boolean; override;
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function StartConfig:Boolean; override;
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function StopConfig:Boolean; override;
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function ProcessConfig:Boolean; override;
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function SetConfig(AInitDelay,ARetryCount,ARetryTimeout:LongWord):Boolean; override;
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ARP configuration transport
ARP configuration
[Expand]
TARPConfig = class(TNetworkConfig)
constructor Create(AManager:TProtocolManager);
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destructor Destroy; override;
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private
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FARP:TARPTransport;
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function ConfigHandler(AHandle:THandle; AAdapter:TTransportAdapter; ACommand:Word):Boolean;
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protected
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public
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function AddTransport(ATransport:TNetworkTransport):Boolean; override;
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function RemoveTransport(ATransport:TNetworkTransport):Boolean; override;
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function StartConfig:Boolean; override;
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function StopConfig:Boolean; override;
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function ProcessConfig:Boolean; override;
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RARP configuration transport
RARP configuration
[Expand]
TRARPConfig = class(TNetworkConfig)
constructor Create(AManager:TProtocolManager);
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destructor Destroy; override;
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private
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FRARP:TRARPTransport;
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function ConfigHandler(AHandle:THandle; AAdapter:TTransportAdapter; ACommand:Word):Boolean;
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protected
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public
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function AddTransport(ATransport:TNetworkTransport):Boolean; override;
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function RemoveTransport(ATransport:TNetworkTransport):Boolean; override;
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function StartConfig:Boolean; override;
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function StopConfig:Boolean; override;
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function ProcessConfig:Boolean; override;
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Static configuration transport
Static configuration
[Expand]
TStaticConfig = class(TNetworkConfig)
constructor Create(AManager:TProtocolManager);
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destructor Destroy; override;
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private
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FARP:TARPTransport;
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function ConfigHandler(AHandle:THandle; AAdapter:TTransportAdapter; ACommand:Word):Boolean;
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protected
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public
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function AddTransport(ATransport:TNetworkTransport):Boolean; override;
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function RemoveTransport(ATransport:TNetworkTransport):Boolean; override;
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function StartConfig:Boolean; override;
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function StopConfig:Boolean; override;
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function ProcessConfig:Boolean; override;
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Loopback configuration transport
Loopback configuration
[Expand]
TLoopbackConfig = class(TNetworkConfig)
constructor Create(AManager:TProtocolManager);
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destructor Destroy; override;
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private
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function ConfigHandler(AHandle:THandle; AAdapter:TTransportAdapter; ACommand:Word):Boolean;
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protected
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public
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function AddTransport(ATransport:TNetworkTransport):Boolean; override;
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function RemoveTransport(ATransport:TNetworkTransport):Boolean; override;
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function StartConfig:Boolean; override;
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function StopConfig:Boolean; override;
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function ProcessConfig:Boolean; override;
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Public variables
None defined
Function declarations
Initialization functions
[Expand]
procedure DHCPInit;
Description: Initialize the DHCP unit and create the Loopback, Static, DHCP, BOOTP, RARP and ARP configuration handlers
| Note | Called only during system startup |
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