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Refine DNS strategies

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This commit is contained in:
JimhHan 2021-04-09 23:36:36 +08:00
parent f4a048aa0c
commit 726a722019
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GPG key ID: 48D5D7CF95157AC5
21 changed files with 255 additions and 208 deletions
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32
features/routing/dns/context.go
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@ -26,40 +26,12 @@ func (ctx *ResolvableContext) GetTargetIPs() []net.IP {
}
if domain := ctx.GetTargetDomain(); len(domain) != 0 {
var lookupFunc func(string) ([]net.IP, error) = ctx.dnsClient.LookupIP
ipOption := &dns.IPOption{
IPv4Enable: true,
IPv6Enable: true,
}
if c, ok := ctx.dnsClient.(dns.ClientWithIPOption); ok {
ipOption = c.GetIPOption()
c.SetFakeDNSOption(false) // Skip FakeDNS.
} else {
newError("ctx.dnsClient doesn't implement ClientWithIPOption").AtDebug().WriteToLog()
}
switch {
case ipOption.IPv4Enable && !ipOption.IPv6Enable:
if lookupIPv4, ok := ctx.dnsClient.(dns.IPv4Lookup); ok {
lookupFunc = lookupIPv4.LookupIPv4
} else {
newError("ctx.dnsClient doesn't implement IPv4Lookup. Use LookupIP instead.").AtDebug().WriteToLog()
}
case !ipOption.IPv4Enable && ipOption.IPv6Enable:
if lookupIPv6, ok := ctx.dnsClient.(dns.IPv6Lookup); ok {
lookupFunc = lookupIPv6.LookupIPv6
} else {
newError("ctx.dnsClient doesn't implement IPv6Lookup. Use LookupIP instead.").AtDebug().WriteToLog()
}
}
ips, err := lookupFunc(domain)
ips, err := ctx.dnsClient.LookupIP(domain)
if err == nil {
ctx.resolvedIPs = ips
return ips
}
newError("resolve ip for ", domain).Base(err).WriteToLog()
newError("failed to resolve ip for ", domain).Base(err).WriteToLog()
}
return nil