Difference between revisions of "Unit DNS"

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| <code>DNS_OPCODE_UNKNOWN = 3;</code>
 
| <code>DNS_OPCODE_UNKNOWN = 3;</code>
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| &nbsp;)
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| &nbsp;
 
|-
 
|-
 
| <code>DNS_OPCODE_NOTIFY = 4;</code>
 
| <code>DNS_OPCODE_NOTIFY = 4;</code>
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|-
 
|}
 
|}
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</div></div>
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</div></div>
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'''DNS client name'''
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<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
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<code>PDNSClientName = ^TDNSClientName;</code>
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<code>TDNSClientName = array[0..MAX_NAME_SIZE - 1] of Char;</code>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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| &nbsp;
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| style="width: 50%;"|&nbsp;
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</div></div> 
  
 
'''DNS client data'''
 
'''DNS client data'''
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| style="width: 50%;"|&nbsp;
 
| style="width: 50%;"|&nbsp;
 
|-
 
|-
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| <code>HostEntName:array[0..MAX_NAME_SIZE - 1] of Char;</code>
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| <code>HostEntName:TDNSClientName;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-
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| <code>HostAliasesPtr:PChar;</code>
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| <code>HostAliasesPtr:array[0..MAX_NAME_ALIASES] of PChar;</code>
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| &nbsp;
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| One extra for terminating null pointer
 
|-
 
|-
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| <code>HostAliases:array[0..(MAX_NAME_SIZE * MAX_NAME_ALIASES) - 1] of Char;</code>
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| <code>HostAliases:array[0..MAX_NAME_ALIASES - 1] of TDNSClientName;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-
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| <code>HostAddrListPtr:PChar;</code>
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| <code>HostAddrListPtr:array[0..MAX_HOST_ALIASES] of PChar;</code>
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| &nbsp;
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| One extra for terminating null pointer
 
|-
 
|-
 
| <code>HostAddrList:array[0..MAX_HOST_ALIASES - 1] of TInAddr;</code>
 
| <code>HostAddrList:array[0..MAX_HOST_ALIASES - 1] of TInAddr;</code>
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| &nbsp;
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|-
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| <code>HostAddr6ListPtr:array[0..MAX_HOST_ALIASES] of PChar;</code>
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| One extra for terminating null pointer
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|-
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| <code>HostAddr6List:array[0..MAX_HOST_ALIASES - 1] of TIn6Addr;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-
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| &nbsp;
 
| &nbsp;
 
|-
 
|-
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| <code>NetEntName:array[0..MAX_NAME_SIZE - 1] of Char;</code>
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| <code>NetEntName:TDNSClientName;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-
−
| <code>NetAliasesPtr:PChar;</code>
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| <code>NetAliasesPtr:array[0..MAX_NAME_ALIASES] of PChar;</code>
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| &nbsp;
+
| One extra for terminating null pointer
 
|-
 
|-
−
| <code>NetAliases:array[0..(MAX_NAME_SIZE * MAX_NAME_ALIASES) - 1] of Char;</code>
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| <code>NetAliases:array[0..MAX_NAME_ALIASES - 1] of TDNSClientName;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-
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| &nbsp;
 
| &nbsp;
 
|-
 
|-
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| <code>ServEntName:array[0..MAX_NAME_SIZE - 1] of Char;</code>
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| <code>ServEntName:TDNSClientName;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-
−
| <code>ServAliasesPtr:PChar;</code>
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| <code>ServAliasesPtr:array[0..MAX_NAME_ALIASES] of PChar;</code>
−
| &nbsp;
+
| One extra for terminating null pointer
 
|-
 
|-
−
| <code>ServAliases:array[0..(MAX_NAME_SIZE * MAX_NAME_ALIASES) - 1] of Char;</code>
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| <code>ServAliases:array[0..MAX_NAME_ALIASES - 1] of TDNSClientName;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-
−
| <code>ServEntProto:array[0..MAX_NAME_SIZE - 1] of Char;</code>
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| <code>ServEntProto:TDNSClientName;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-
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| &nbsp;
 
| &nbsp;
 
|-
 
|-
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| <code>ProtoEntName:array[0..MAX_NAME_SIZE - 1] of Char;</code>
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| <code>ProtoEntName:TDNSClientName;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-
−
| <code>ProtoAliasesPtr:PChar;</code>
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| <code>ProtoAliasesPtr:array[0..MAX_NAME_ALIASES] of PChar;</code>
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| &nbsp;
+
| One extra for terminating null pointer
 
|-
 
|-
−
| <code>ProtoAliases:array[0..(MAX_NAME_SIZE * MAX_NAME_ALIASES) - 1] of Char;</code>
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| <code>ProtoAliases:array[0..MAX_NAME_ALIASES - 1] of TDNSClientName;</code>
 
| &nbsp;
 
| &nbsp;
 
|-
 
|-

Latest revision as of 02:24, 6 March 2025

Return to Unit Reference


Description

Ultibo DNS Client unit

Note: DNS Client is IPv4 based, for IPv6 see new Winsock2 functions

See RFC 1035 Section 4 for details

Constants


DNS specific constants DNS_*
DNS_TIMEOUT = 2000; We wait for 2 seconds for a DNS reply
DNS_RETRIES = 2; Try the request 2 times
 
DNS_HEADER_SIZE = 12; SizeOf(TDNSHeader);
 
DNS_QUESTION_SIZE = 4; SizeOf(TDNSQuestion);
DNS_RESOURCE_SIZE = 10; SizeOf(TDNSResource); Not including Record Data
 
MAX_DNS_NAME = 255;  
MAX_DNS_LABEL = 63;  
MAX_DNS_MESSAGE = 512; Maximum Size of DNS Message


DNS flag DNS_FLAG_*
DNS_FLAG_RESPONSE = $8000; query = 0, response = 1
DNS_FLAG_AUTHORITY = $0400; Authoritative answer
DNS_FLAG_TRUNCATED = $0200; Truncation, response was cut off at 512
DNS_FLAG_DO_RECURSE = $0100; Recursion desired
DNS_FLAG_CAN_RECURSE = $0080; Recursion available


DNS field mask DNS_*_MASK
DNS_OPCODE_MASK = $7800; Opcode
DNS_RESPONSE_MASK = $000F; Response code


DNS opcode DNS_OPCODE_*
DNS_OPCODE_QUERY = 0; A standard query
DNS_OPCODE_IQUERY = 1; An inverse query
DNS_OPCODE_SERVER_STATUS = 2;  
DNS_OPCODE_UNKNOWN = 3;  
DNS_OPCODE_NOTIFY = 4;  
DNS_OPCODE_UPDATE = 5;  


DNS response code DNS_RESPONSE_*
DNS_RESPONSE_NO_ERROR = 0;  
DNS_RESPONSE_FORMAT_ERROR = 1;  
DNS_RESPONSE_SERVER_FAILURE = 2;  
DNS_RESPONSE_NAME_ERROR = 3;  
DNS_RESPONSE_NOT_IMPLEMENTED = 4;  
DNS_RESPONSE_REFUSED = 5;  


DNS record type DNS_TYPE_*
DNS_TYPE_A = $0001; Host address resource record (RR)
DNS_TYPE_NS = $0002;  
DNS_TYPE_MD = $0003;  
DNS_TYPE_MF = $0004;  
DNS_TYPE_CNAME = $0005;  
DNS_TYPE_SOA = $0006;  
DNS_TYPE_MB = $0007;  
DNS_TYPE_MG = $0008;  
DNS_TYPE_MR = $0009;  
DNS_TYPE_NULL = $000a;  
DNS_TYPE_WKS = $000b;  
DNS_TYPE_PTR = $000c; A domain name ptr
DNS_TYPE_HINFO = $000d;  
DNS_TYPE_MINFO = $000e;  
DNS_TYPE_MX = $000f; Mail exchange
DNS_TYPE_TEXT = $0010;  
DNS_TYPE_RP = $0011;  
DNS_TYPE_AFSDB = $0012;  
DNS_TYPE_X25 = $0013;  
DNS_TYPE_ISDN = $0014;  
DNS_TYPE_RT = $0015;  
DNS_TYPE_NSAP = $0016;  
DNS_TYPE_NSAPPTR = $0017;  
DNS_TYPE_SIG = $0018;  
DNS_TYPE_KEY = $0019;  
DNS_TYPE_PX = $001a;  
DNS_TYPE_GPOS = $001b;  
DNS_TYPE_AAAA = $001c;  
DNS_TYPE_LOC = $001d;  
DNS_TYPE_NXT = $001e;  
DNS_TYPE_EID = $001f;  
DNS_TYPE_NIMLOC = $0020;  
DNS_TYPE_SRV = $0021;  
DNS_TYPE_ATMA = $0022;  
DNS_TYPE_NAPTR = $0023;  
DNS_TYPE_KX = $0024;  
DNS_TYPE_CERT = $0025;  
DNS_TYPE_A6 = $0026;  
DNS_TYPE_DNAME = $0027;  
DNS_TYPE_SINK = $0028;  
DNS_TYPE_OPT = $0029;  
DNS_TYPE_DS = $002B;  
DNS_TYPE_RRSIG = $002E;  
DNS_TYPE_NSEC = $002F;  
DNS_TYPE_DNSKEY = $0030;  
DNS_TYPE_DHCID = $0031;  
DNS_TYPE_UINFO = $0064;  
DNS_TYPE_UID = $0065;  
DNS_TYPE_GID = $0066;  
DNS_TYPE_UNSPEC = $0067;  
DNS_TYPE_ADDRS = $00f8;  
DNS_TYPE_TKEY = $00f9;  
DNS_TYPE_TSIG = $00fa;  
DNS_TYPE_IXFR = $00fb;  
DNS_TYPE_AXFR = $00fc;  
DNS_TYPE_MAILB = $00fd;  
DNS_TYPE_MAILA = $00fe;  
DNS_TYPE_ALL = $00ff;  
DNS_TYPE_ANY = $00ff;  
DNS_TYPE_WINS = $ff01;  
DNS_TYPE_WINSR = $ff02;  
DNS_TYPE_NBSTAT = DNS_TYPE_WINSR;  


DNS address class DNS_CLASS_*
DNS_CLASS_INTERNET = $0001;  
DNS_CLASS_CSNET = $0002;  
DNS_CLASS_CHAOS = $0003;  
DNS_CLASS_HESIOD = $0004;  
DNS_CLASS_NONE = $00fe;  
DNS_CLASS_ALL = $00ff;  
DNS_CLASS_ANY = $00ff;  
DNS_CLASS_IN = DNS_CLASS_INTERNET; ARPA internet class
DNS_CLASS_CS = DNS_CLASS_CSNET;  
DNS_CLASS_WILD = DNS_CLASS_ANY; Wildcard for several of the classifications


DNS message compression DNS_POINTER_*
DNS_POINTER_MASK = $C0; Mask to indicate pointer to previously used name


Type definitions


DNS specific types

PDNSHeader = ^TDNSHeader;

TDNSHeader = packed record

Note: All Network Order
Identifier:Word; unique identifier
Flags:Word; QD/Opcode/AA/TC/RD/RA/RCODE
QuestionCount:Word; question section, number of entries
AnswerCount:Word; answers, how many
AuthorityCount:Word; count of name server RRs
AdditionalCount:Word; number of "additional" records

DNS message

PDNSMessage = ^TDNSMessage;

TDNSMessage = packed record

DNS:TDNSHeader;  
Data:array[0..(MAX_DNS_MESSAGE - DNS_HEADER_SIZE) - 1] of Byte;  

DNS name

PDNSName = ^TDNSName;

TDNSName = array[0..MAX_DNS_NAME - 1] of Char;

   

DNS question

PDNSQuestion = ^TDNSQuestion;

TDNSQuestion = packed record

Note: All Network Order
Name:TDNSName; variable length question name
QuestionType:Word; question type (eg DNS_TYPE_A)
QuestionClass:Word; question class (eg DNS_CLASS_IN)

DNS resource

PDNSResource = ^TDNSResource;

TDNSResource = packed record

Note: All Network Order
Name:TDNSName; variable length resource name
RecordType:Word; resource record type (eg DNS_TYPE_A)
RecordClass:Word; resource record class (eg DNS_CLASS_IN)
Ttl:LongWord; time-to-live, changed to 32 bits
DataLength:Word; length of data field
RecordData:array[0..MAX_DNS_MESSAGE - 1] of Byte; data field

DNS client name

PDNSClientName = ^TDNSClientName;

TDNSClientName = array[0..MAX_NAME_SIZE - 1] of Char;

   

DNS client data

PDNSClientData = ^TDNSClientData;

TDNSClientData = record

Note: Used for TLS Data
Host Ent
HostEnt:THostEnt;  
HostEntName:TDNSClientName;  
HostAliasesPtr:array[0..MAX_NAME_ALIASES] of PChar; One extra for terminating null pointer
HostAliases:array[0..MAX_NAME_ALIASES - 1] of TDNSClientName;  
HostAddrListPtr:array[0..MAX_HOST_ALIASES] of PChar; One extra for terminating null pointer
HostAddrList:array[0..MAX_HOST_ALIASES - 1] of TInAddr;  
HostAddr6ListPtr:array[0..MAX_HOST_ALIASES] of PChar; One extra for terminating null pointer
HostAddr6List:array[0..MAX_HOST_ALIASES - 1] of TIn6Addr;  
Net Ent
NetEnt:TNetEnt;  
NetEntName:TDNSClientName;  
NetAliasesPtr:array[0..MAX_NAME_ALIASES] of PChar; One extra for terminating null pointer
NetAliases:array[0..MAX_NAME_ALIASES - 1] of TDNSClientName;  
Serv Ent
ServEnt:TServEnt;  
ServEntName:TDNSClientName;  
ServAliasesPtr:array[0..MAX_NAME_ALIASES] of PChar; One extra for terminating null pointer
ServAliases:array[0..MAX_NAME_ALIASES - 1] of TDNSClientName;  
ServEntProto:TDNSClientName;  
Proto Ent
ProtoEnt:TProtoEnt;  
ProtoEntName:TDNSClientName;  
ProtoAliasesPtr:array[0..MAX_NAME_ALIASES] of PChar; One extra for terminating null pointer
ProtoAliases:array[0..MAX_NAME_ALIASES - 1] of TDNSClientName;  


Class definitions


DNS specific classes

TDNSClient = class(TNetworkClient)


Public variables

None defined

Function declarations


Initialization functions 

procedure DNSInit;
Description: To be documented
Note None documented 


function DNSStart:LongWord;
Description: To be documented
Note None documented 


function DNSStop:LongWord;
Description: To be documented
Note None documented


Return to Unit Reference

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