miracle091/dnscrypt-proxy
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dnscrypt-proxy
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Check record type in xTransport 

Prepare for IPv6-only support by the way

Fixes #189
This commit is contained in:
Frank Denis 2018-02-26 14:50:01 +01:00
parent 5de18b5274
commit 38fd879b56
2 changed files with 19 additions and 5 deletions
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2
dnscrypt-proxy/main.go
View File

@ -36,7 +36,7 @@ func main() {
dlog.Debug(err)
}
app.proxy = NewProxy()
app.proxy.xTransport = NewXTransport(30 * time.Second)
app.proxy.xTransport = NewXTransport(30*time.Second, true, false)
if err := ConfigLoad(&app.proxy, svcFlag); err != nil {
dlog.Fatal(err)

22
dnscrypt-proxy/xtransport.go
View File

@ -32,16 +32,20 @@ type XTransport struct {
cachedIPs CachedIPs
fallbackResolver string
ignoreSystemDNS bool
useIPv4 bool
useIPv6 bool
}
var IdleConnTimeout = 5 * time.Second
func NewXTransport(timeout time.Duration) *XTransport {
func NewXTransport(timeout time.Duration, useIPv4 bool, useIPv6 bool) *XTransport {
xTransport := XTransport{
cachedIPs: CachedIPs{cache: make(map[string]string)},
timeout: timeout,
fallbackResolver: DefaultFallbackResolver,
ignoreSystemDNS: false,
useIPv4: useIPv4,
useIPv6: useIPv6,
}
xTransport.rebuildTransport()
return &xTransport
@ -129,6 +133,9 @@ func (xTransport *XTransport) Fetch(method string, url *url.URL, accept string,
dlog.Debugf("IP for [%s] was cached to [%s], but connection failed: [%s]", host, cachedIP, err)
return nil, 0, err
}
if !xTransport.useIPv4 {
return nil, 0, fmt.Errorf("IPv4 connectivity would be required to use [%s]", host)
}
dnsClient := new(dns.Client)
msg := new(dns.Msg)
msg.SetQuestion(dns.Fqdn(host), dns.TypeA)
@ -142,12 +149,19 @@ func (xTransport *XTransport) Fetch(method string, url *url.URL, accept string,
if err != nil {
return nil, 0, err
}
if len(in.Answer) <= 0 {
var foundIP *string
for _, answer := range in.Answer {
if answer.Header().Rrtype == dns.TypeA {
foundIPx := in.Answer[0].(*dns.A).A.String()
foundIP = &foundIPx
break
}
}
if foundIP == nil {
return nil, 0, fmt.Errorf("No IP found for [%s]", host)
}
foundIP := in.Answer[0].(*dns.A).A.String()
xTransport.cachedIPs.Lock()
xTransport.cachedIPs.cache[host] = foundIP
xTransport.cachedIPs.cache[host] = *foundIP
xTransport.cachedIPs.Unlock()
dlog.Debugf("[%s] IP address [%s] added to the cache", host, foundIP)