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feat: add queryStrategy option for DNS

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This commit is contained in:
AkinoKaede 2021-03-19 23:33:07 +08:00
parent 41d3f31447
commit 8382b29922
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GPG key ID: C687746B27587C0D
16 changed files with 419 additions and 267 deletions
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34
proxy/dns/dns.go
View file

@ -37,12 +37,27 @@ type ownLinkVerifier interface {
type Handler struct {
client dns.Client
ipv4Lookup dns.IPv4Lookup
ipv6Lookup dns.IPv6Lookup
ownLinkVerifier ownLinkVerifier
server net.Destination
}
func (h *Handler) Init(config *Config, dnsClient dns.Client) error {
h.client = dnsClient
if ipv4lookup, ok := dnsClient.(dns.IPv4Lookup); ok {
h.ipv4Lookup = ipv4lookup
} else {
return newError("dns.Client doesn't implement IPv4Lookup")
}
if ipv6lookup, ok := dnsClient.(dns.IPv6Lookup); ok {
h.ipv6Lookup = ipv6lookup
} else {
return newError("dns.Client doesn't implement IPv6Lookup")
}
if v, ok := dnsClient.(ownLinkVerifier); ok {
h.ownLinkVerifier = v
}
@ -199,19 +214,18 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
var ttl uint32 = 600
// Do NOT skip FakeDNS
if c, ok := h.client.(dns.ClientWithIPOption); ok {
c.SetFakeDNSOption(true)
} else {
newError("dns.Client doesn't implement ClientWithIPOption")
}
switch qType {
case dnsmessage.TypeA:
ips, err = h.client.LookupIP(domain, dns.IPOption{
IPv4Enable: true,
IPv6Enable: false,
FakeEnable: true,
})
ips, err = h.ipv4Lookup.LookupIPv4(domain)
case dnsmessage.TypeAAAA:
ips, err = h.client.LookupIP(domain, dns.IPOption{
IPv4Enable: false,
IPv6Enable: true,
FakeEnable: true,
})
ips, err = h.ipv6Lookup.LookupIPv6(domain)
}
rcode := dns.RCodeFromError(err)

24
proxy/freedom/freedom.go
View file

@ -59,26 +59,24 @@ func (h *Handler) policy() policy.Session {
}
func (h *Handler) resolveIP(ctx context.Context, domain string, localAddr net.Address) net.Address {
var option dns.IPOption = dns.IPOption{
IPv4Enable: true,
IPv6Enable: true,
FakeEnable: false,
if c, ok := h.dns.(dns.ClientWithIPOption); ok {
c.SetFakeDNSOption(false) // Skip FakeDNS
} else {
newError("DNS client doesn't implement ClientWithIPOption")
}
var lookupFunc func(string) ([]net.IP, error) = h.dns.LookupIP
if h.config.DomainStrategy == Config_USE_IP4 || (localAddr != nil && localAddr.Family().IsIPv4()) {
option = dns.IPOption{
IPv4Enable: true,
IPv6Enable: false,
FakeEnable: false,
if lookupIPv4, ok := h.dns.(dns.IPv4Lookup); ok {
lookupFunc = lookupIPv4.LookupIPv4
}
} else if h.config.DomainStrategy == Config_USE_IP6 || (localAddr != nil && localAddr.Family().IsIPv6()) {
option = dns.IPOption{
IPv4Enable: false,
IPv6Enable: true,
FakeEnable: false,
if lookupIPv6, ok := h.dns.(dns.IPv6Lookup); ok {
lookupFunc = lookupIPv6.LookupIPv6
}
}
ips, err := h.dns.LookupIP(domain, option)
ips, err := lookupFunc(domain)
if err != nil {
newError("failed to get IP address for domain ", domain).Base(err).WriteToLog(session.ExportIDToError(ctx))
}