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Forwarding plugin: retry over TCP if a truncated response is received

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dns.Exchange() doesn't do it automatically.

Fixes #1178
This commit is contained in:
Frank Denis 2020-02-05 02:44:43 +01:00
parent 170c690996
commit 63d28fc9b2
1 changed files with 9 additions and 1 deletions
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10
dnscrypt-proxy/plugin_forward.go
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@ -89,10 +89,18 @@ func (plugin *PluginForward) Eval(pluginsState *PluginsState, msg *dns.Msg) erro
}
server := servers[rand.Intn(len(servers))]
pluginsState.serverName = server
respMsg, err := dns.Exchange(msg, server)
client := dns.Client{Net: "udp"}
respMsg, _, err := client.Exchange(msg, server)
if err != nil {
return err
}
if respMsg.Truncated {
client.Net = "tcp"
respMsg, _, err = client.Exchange(msg, server)
if err != nil {
return err
}
}
if edns0 := respMsg.IsEdns0(); edns0 == nil || !edns0.Do() {
respMsg.AuthenticatedData = false
}