Add separate handshake timeout

This PR adds a new setting to the config: `network.timeout`. This setting
defines a time period during which all handshake procedures and
ceremonies must be completed. If not - connection is aborted. This
should help in situations when connection is established but client
cannot continue for some reason (for example, RST sent by some middle box).

internal/cli/run_proxy.go

@@ -263,6 +263,7 @@ func runProxy(conf *config.Config, version string) error { //nolint: funlen
 		AllowFallbackOnUnknownDC: conf.AllowFallbackOnUnknownDC.Get(false),
 		TolerateTimeSkewness:     conf.TolerateTimeSkewness.Value,
 		IdleTimeout:              conf.Network.Timeout.Idle.Get(mtglib.DefaultIdleTimeout),
+		HandshakeTimeout:         conf.Network.Timeout.Handshake.Get(mtglib.DefaultHandshakeTimeout),
 
 		DoppelGangerURLs:    doppelGangerURLs,
 		DoppelGangerPerRaid: conf.Defense.Doppelganger.Repeats.Get(mtglib.DoppelGangerPerRaid),

internal/config/config.go

@@ -60,9 +60,10 @@ type Config struct {
 	} `json:"defense"`
 	Network struct {
 		Timeout struct {
-			TCP  TypeDuration `json:"tcp"`
-			HTTP TypeDuration `json:"http"`
-			Idle TypeDuration `json:"idle"`
+			TCP       TypeDuration `json:"tcp"`
+			HTTP      TypeDuration `json:"http"`
+			Idle      TypeDuration `json:"idle"`
+			Handshake TypeDuration `json:"handshake"`
 		} `json:"timeout"`
 		DOHIP   TypeIP         `json:"dohIp"`
 		DNS     TypeDNSURI     `json:"dns"`

internal/config/parse.go

@@ -55,9 +55,10 @@ type tomlConfig struct {
 	} `toml:"defense" json:"defense,omitempty"`
 	Network struct {
 		Timeout struct {
-			TCP  string `toml:"tcp" json:"tcp,omitempty"`
-			HTTP string `toml:"http" json:"http,omitempty"`
-			Idle string `toml:"idle" json:"idle,omitempty"`
+			TCP       string `toml:"tcp" json:"tcp,omitempty"`
+			HTTP      string `toml:"http" json:"http,omitempty"`
+			Idle      string `toml:"idle" json:"idle,omitempty"`
+			Handshake string `toml:"handshake" json:"handshake,omitempty"`
 		} `toml:"timeout" json:"timeout,omitempty"`
 		DOHIP   string   `toml:"doh-ip" json:"dohIp,omitempty"`
 		DNS     string   `toml:"dns" json:"dns,omitempty"`