Documentation
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Overview ¶
Package fastip implements the algorithm that allows to query multiple resolvers, ping all IP addresses that were returned, and return the fastest one among them.
Index ¶
Constants ¶
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Functions ¶
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Types ¶
type FastestAddr ¶
type FastestAddr struct {
// contains filtered or unexported fields
}
FastestAddr - object data
func NewFastestAddr ¶
func NewFastestAddr() *FastestAddr
NewFastestAddr initializes a new instance of the FastestAddr
func (*FastestAddr) ExchangeFastest ¶
func (f *FastestAddr) ExchangeFastest(req *dns.Msg, upstreams []upstream.Upstream) (*dns.Msg, upstream.Upstream, error)
ExchangeFastest queries all specified upstreams and returns a response with the fastest IP address.
Algorithm: Return DNS response containing the fastest IP address Algorithm: . Send requests to all upstream servers . Receive responses . Search all IP addresses in cache:
. If all addresses have been found: choose the fastest . If several (but not all) addresses have been found: remember the fastest
. For each response, for each IP address (not found in cache):
. connect via TCP
. Receive TCP connection status. The first connected address - the fastest IP address. . Choose the fastest address between this and the one previously found in cache . Return DNS packet containing the chosen IP address (remove all other IP addresses from the packet)
Source Files