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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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29
proxy/dns/dns.go
View file

@ -37,8 +37,6 @@ type ownLinkVerifier interface {
type Handler struct {
client dns.Client
ipv4Lookup dns.IPv4Lookup
ipv6Lookup dns.IPv6Lookup
ownLinkVerifier ownLinkVerifier
server net.Destination
}
@ -46,18 +44,6 @@ type Handler struct {
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
}
@ -213,21 +199,18 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
var err error
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")
}
var opt = dns.LookupIP
switch qType {
case dnsmessage.TypeA:
ips, err = h.ipv4Lookup.LookupIPv4(domain)
opt = dns.LookupIPv4
case dnsmessage.TypeAAAA:
ips, err = h.ipv6Lookup.LookupIPv6(domain)
opt = dns.LookupIPv6
}
opt.FakeEnable = true
ips, err = h.client.LookupOptions(domain, opt)
rcode := dns.RCodeFromError(err)
if rcode == 0 && len(ips) == 0 && err != dns.ErrEmptyResponse {
newError("ip query").Base(err).WriteToLog()

19
proxy/freedom/freedom.go
View file

@ -59,24 +59,15 @@ func (h *Handler) policy() policy.Session {
}
func (h *Handler) resolveIP(ctx context.Context, domain string, localAddr net.Address) net.Address {
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
var opt = dns.LookupIP
if h.config.DomainStrategy == Config_USE_IP4 || (localAddr != nil && localAddr.Family().IsIPv4()) {
if lookupIPv4, ok := h.dns.(dns.IPv4Lookup); ok {
lookupFunc = lookupIPv4.LookupIPv4
}
opt = dns.LookupIPv4
} else if h.config.DomainStrategy == Config_USE_IP6 || (localAddr != nil && localAddr.Family().IsIPv6()) {
if lookupIPv6, ok := h.dns.(dns.IPv6Lookup); ok {
lookupFunc = lookupIPv6.LookupIPv6
}
opt = dns.LookupIPv6
}
opt.FakeEnable = true
ips, err := lookupFunc(domain)
ips, err := h.dns.LookupOptions(domain, opt)
if err != nil {
newError("failed to get IP address for domain ", domain).Base(err).WriteToLog(session.ExportIDToError(ctx))
}