DNSCrypt/dnscrypt-proxy
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More checks on the response

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This commit is contained in:
Frank Denis 2018-01-27 16:59:45 +01:00
parent 7dde2f4a37
commit d2f6c69a2c
1 changed files with 3 additions and 2 deletions
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5
dnscrypt-proxy/serversInfo.go
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@ -215,7 +215,7 @@ func (serversInfo *ServersInfo) fetchDoHServerInfo(proxy *Proxy, name string, st
return ServerInfo{}, err
}
body := ioutil.NopCloser(bytes.NewReader([]byte{
0x00, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x29, 0x10, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00,
0xca, 0xfe, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x29, 0x10, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00,
}))
req := &http.Request{
Method: "POST",
@ -243,7 +243,8 @@ func (serversInfo *ServersInfo) fetchDoHServerInfo(proxy *Proxy, name string, st
if err != nil {
return ServerInfo{}, err
}
if len(respBody) < MinDNSPacketSize || len(respBody) > MaxDNSPacketSize {
if len(respBody) < MinDNSPacketSize || len(respBody) > MaxDNSPacketSize ||
respBody[0] != 0xca || respBody[1] != 0xfe || respBody[4] != 0x00 || respBody[5] != 0x01 {
return ServerInfo{}, errors.New("Webserver returned an unexpected response")
}
dlog.Noticef("[%s] OK (DoH) - rtt: %dms", name, rtt.Nanoseconds()/1000000)