Direct / Reject / Drop

[!NOTE] This document is partially generated by AI.

These are special “terminal” protocols in yuhaiin that define how a connection is ultimately handled when no further proxying is required or allowed.

Network Support

• Direct: Supports both TCP and UDP natively.
  • NAT Type: Full-Cone NAT.
• Reject/Drop: Applies to both TCP and UDP traffic.

Direct

The Direct protocol instructs yuhaiin to connect directly to the destination without any proxy.

Configuration Fields

Normally, direct is used as a simple tag in rules, but it has one specific configuration field when used in a node:

• network_interface (string): (Optional) The specific local network interface name (e.g., eth0, wlan0) to bind for the outgoing connection.

---

Reject

The Reject protocol explicitly blocks the connection and sends an error (e.g., a TCP Reset or ICMP Port Unreachable) back to the source.

---

Drop

The Drop protocol silently discards the connection. No error is sent back, and the connection simply times out on the client’s side.

---

Usage in Rules

While they can be configured as nodes, these protocols are most frequently used as actions within yuhaiin’s routing rules:

{
  "rules": [
    { "domain": "local.lan", "action": "direct" },
    { "domain": "ads.example.com", "action": "reject" },
    { "ip": "1.2.3.4", "action": "drop" }
  ]
}

Developer Details

Implementation

• Direct: Uses the system’s default dialer. Found in pkg/net/proxy/direct.
• Reject/Drop: Implemented as dummy proxies that immediately return errors or hang indefinitely. Found in pkg/net/proxy/reject.