DNS Client API

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DNS Client API
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Utilizing DNS Functionality
Get an IP Address Based on Host Name

• DNSAddServer()
• DNSRemoveServer()
• DNSGetServers()
• DNSgethostbyname()

Baseline Application Kernel, Stack, BSP DNS
Integral
Supplied APIs
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Typical DNS Implementation

• Informs Stack of DNS Server(s)
• Via DHCP or Direct Call

DNSAddServer(ULONG IP_Address)

• Returns an IP address if Successful

DNSgethostbyname(char name)
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Getting DNS Server IP Addresses

• Use DNSGetServers to retrieve list of DNS
  serversint DNSGetServers( unsigned long
  IpAddrs, int nArraySize )Server
  count
• Up to 3 DNS server IP addresses are returned in
  the IpAddrs array (which should therefore usually
  have 3 elements).
• Returns number of DNS servers, or 1 for failure.
• This function is especially useful when the DHCP
  client is used.

IP address array (3 elements)
Size of supplied IP address array