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Add domain-fronting-ip option

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Allow specifying an explicit IP address for the domain fronting host
instead of relying on DNS resolution. Useful when DNS resolution of
the fronting hostname is blocked.

The hostname from the secret is still used for SNI in TLS handshake.
This commit is contained in:
ivulit
2026-02-20 12:34:17 +03:00
parent 432e530f68
commit bf38f9f8af
6 changed files with 28 additions and 1 deletions
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internal/cli/run_proxy.go
+1
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@@ -260,6 +260,7 @@ func runProxy(conf *config.Config, version string) error { //nolint: funlen
Secret: conf.Secret,
DomainFrontingPort: conf.DomainFrontingPort.Get(mtglib.DefaultDomainFrontingPort),
DomainFrontingIP: conf.DomainFrontingIP.String(),
PreferIP: conf.PreferIP.Get(mtglib.DefaultPreferIP),
AllowFallbackOnUnknownDC: conf.AllowFallbackOnUnknownDC.Get(false),
internal/cli/simple_run.go
+7
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@@ -18,6 +18,7 @@ type SimpleRun struct {
TCPBuffer string `kong:"name='tcp-buffer',short='b',default='4KB',help='Deprecated and ignored'"` //nolint: lll
PreferIP string `kong:"name='prefer-ip',short='i',default='prefer-ipv6',help='IP preference. By default we prefer IPv6 with fallback to IPv4.'"` //nolint: lll
DomainFrontingPort uint64 `kong:"name='domain-fronting-port',short='p',default='443',help='A port to access for domain fronting.'"` //nolint: lll
DomainFrontingIP string `kong:"name='domain-fronting-ip',help='An IP address to use for domain fronting instead of resolving the hostname via DNS.'"` //nolint: lll
DOHIP net.IP `kong:"name='doh-ip',short='n',default='1.1.1.1',help='IP address of DNS-over-HTTP to use.'"` //nolint: lll
Timeout time.Duration `kong:"name='timeout',short='t',default='10s',help='Network timeout to use'"` //nolint: lll
Socks5Proxies []string `kong:"name='socks5-proxy',short='s',help='Socks5 proxies to use for network access.'"` //nolint: lll
@@ -47,6 +48,12 @@ func (s *SimpleRun) Run(cli *CLI, version string) error { //nolint: cyclop,funle
return fmt.Errorf("incorrect domain-fronting-port: %w", err)
}
if s.DomainFrontingIP != "" {
if err := conf.DomainFrontingIP.Set(s.DomainFrontingIP); err != nil {
return fmt.Errorf("incorrect domain-fronting-ip: %w", err)
}
}
if err := conf.Network.DOHIP.Set(s.DOHIP.String()); err != nil {
return fmt.Errorf("incorrect doh-ip: %w", err)
}
internal/config/config.go
+1
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@@ -28,6 +28,7 @@ type Config struct {
ProxyProtocolListener TypeBool `json:"proxyProtocolListener"`
PreferIP TypePreferIP `json:"preferIp"`
DomainFrontingPort TypePort `json:"domainFrontingPort"`
DomainFrontingIP TypeIP `json:"domainFrontingIp"`
TolerateTimeSkewness TypeDuration `json:"tolerateTimeSkewness"`
Concurrency TypeConcurrency `json:"concurrency"`
Defense struct {
internal/config/parse.go
+1
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@@ -16,6 +16,7 @@ type tomlConfig struct {
ProxyProtocolListener bool `toml:"proxy-protocol-listener" json:"proxyProtocolListener"`
PreferIP string `toml:"prefer-ip" json:"preferIp,omitempty"`
DomainFrontingPort uint `toml:"domain-fronting-port" json:"domainFrontingPort,omitempty"`
DomainFrontingIP string `toml:"domain-fronting-ip" json:"domainFrontingIp,omitempty"`
TolerateTimeSkewness string `toml:"tolerate-time-skewness" json:"tolerateTimeSkewness,omitempty"`
Concurrency uint `toml:"concurrency" json:"concurrency,omitempty"`
Defense struct {