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tsdns: dual resolution mode, IPv6 support (#526)

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This change adds to tsdns the ability to delegate lookups to upstream nameservers.
This is crucial for setting Magic DNS as the system resolver.

Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
This commit is contained in:
Dmytro Shynkevych
2020-07-07 15:25:32 -04:00
committed by GitHub
parent ce1b52bb71
commit 67ebba90e1
7 changed files with 555 additions and 257 deletions
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13
wgengine/packet/ip.go
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@@ -7,6 +7,8 @@ package packet
import (
"fmt"
"net"
"inet.af/netaddr"
)
// IP is an IPv4 address.
@@ -22,6 +24,17 @@ func NewIP(b net.IP) IP {
return IP(get32(b4))
}
// IPFromNetaddr converts a netaddr.IP to an IP.
func IPFromNetaddr(ip netaddr.IP) IP {
ipbytes := ip.As4()
return IP(get32(ipbytes[:]))
}
// Netaddr converts an IP to a netaddr.IP.
func (ip IP) Netaddr() netaddr.IP {
return netaddr.IPv4(byte(ip>>24), byte(ip>>16), byte(ip>>8), byte(ip))
}
func (ip IP) String() string {
return fmt.Sprintf("%d.%d.%d.%d", byte(ip>>24), byte(ip>>16), byte(ip>>8), byte(ip))
}