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Yuhaiin Docs

Redir

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

Redir is a traditional transparent proxying method used primarily on Linux systems. It is functionally similar to TProxy but handles packet redirection slightly differently. In yuhaiin, it is an inbound-only protocol.

Network Support

Section titled “Network Support”
  • TCP: Supported (Intercepted and proxied).
  • UDP: Supported (Intercepted and proxied).
    • NAT Type: Full-Cone NAT.

Inbound Configuration

Section titled “Inbound Configuration”

The redir configuration is extremely simple:

Configuration Fields

Section titled “Configuration Fields”
  • host (string): The address and port where the redirection listener will bind (e.g., 0.0.0.0:60081).

Listener Configuration

Section titled “Listener Configuration”

A Redir inbound must be paired with a tcpudp listener.

Example Configuration

Section titled “Example Configuration”
{
  "name": "Linux-Redir",
  "enabled": true,
  "tcpudp": { "host": "127.0.0.1:60081" },
  "redir": {
    "host": "127.0.0.1:60081"
  }
}

Developer Details

Section titled “Developer Details”

Mechanism

Section titled “Mechanism”

Redir uses destination NAT (DNAT) rules in iptables to redirect traffic to a local port. The yuhaiin listener then uses the getsockopt syscall with SO_ORIGINAL_DST to retrieve the intended destination address.

Support

Section titled “Support”

Like TProxy, Redir is primarily intended for Linux environments.

Implementation

Section titled “Implementation”

Detailed implementation can be found in pkg/net/proxy/redir.