Difference between revisions of "Unit DNS"
From Ultibo.org
| Line 226: | Line 226: | ||
---- | ---- | ||
| − | '' | + | ''None defined'' |
=== Function declarations === | === Function declarations === | ||
Revision as of 02:32, 30 December 2016
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 = 5000;
|
We wait for 5 seconds for a DNS reply |
DNS_RETRIES = 4;
|
Try the request 4 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 constants
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 masks constants
DNS_OPCODE_* DNS_OPCODE_MASK = $7800;
|
Opcode |
DNS_RESPONSE_MASK = $000F;
|
Response code |
DNS query code constants
DNS_QUERY* DNS_QUERY = 0;
|
A standard query |
DNS_INV_QUERY = 1;
|
An inverse query |
DNS_COMP_QUERY_MULTI = 2;
|
A completion query, multiple reply (Obsolete) |
DNS_COMP_QUERY_SINGLE = 3;
|
A completion query, single reply (Obsolete) |
DNS response code constants
DNS_NO_* DNS_NO_ERROR = 0;
|
|
DNS_FORMAT_ERROR = 1;
|
|
DNS_SERVER_FAILURE = 2;
|
|
DNS_NAME_ERROR = 3;
|
|
DNS_NOT_IMPLEMENTED = 4;
|
|
DNS_REFUSED = 5;
|
DNS record type constants
DNS_TYPE_* DNS_TYPE_A = 1;
|
Host address resource record (RR) |
DNS_TYPE_NS = 2;
|
|
DNS_TYPE_MD = 3;
|
|
DNS_TYPE_MF = 4;
|
|
DNS_TYPE_CNAME = 5;
|
|
DNS_TYPE_SOA = 6;
|
|
DNS_TYPE_MB = 7;
|
|
DNS_TYPE_MG = 8;
|
|
DNS_TYPE_MR = 9;
|
|
DNS_TYPE_RT_NULL = 10;
|
|
DNS_TYPE_WKS = 11;
|
|
DNS_TYPE_PTR = 12;
|
A domain name ptr |
DNS_TYPE_HINFO = 13;
|
|
DNS_TYPE_MINFO = 14;
|
|
DNS_TYPE_MX = 15;
|
Mail exchange |
DNS address class constants
DNS_CLASS_* DNS_CLASS_IN = 1;
|
ARPA internet class |
DNS_CLASS_CS = 2;
|
|
DNS_CLASS_WILD = 255;
|
Wildcard for several of the classifications |
DNS message compression constants
DNS_POINTER_* DNS_POINTER_MASK = $C0;
|
Mask to indicate pointer to previously used name |
Type definitions
To be documented
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
