entrypoint.sh

#!/bin/bash

set -e

echo "Starting SSH/SOCKS5 NAT Gateway setup..."

# Enable IP forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward

# Fetch public IP
PUBLIC_IP=$(curl -s ifconfig.me)
if [ -z "$PUBLIC_IP" ]; then
  echo "Error: Could not fetch public IP. Exiting."
  exit 1
fi
echo "Detected public IP: $PUBLIC_IP"

# Configure SSH server
cp /app/ssh-config/sshd_config /etc/ssh/sshd_config
chmod 600 /etc/ssh/sshd_config

# Generate SSH host keys if they don't exist
if [ ! -f /etc/ssh/ssh_host_rsa_key ]; then
  ssh-keygen -A
fi

# Start SSH service in debug mode and redirect output to a file
/usr/sbin/sshd -D -e -f /etc/ssh/sshd_config > /var/log/sshd_debug.log 2>&1 &

echo "SSH server started."

# Configure Dante SOCKS5 server
cp /app/socks5-config/danted.conf /etc/danted.conf
chmod 644 /etc/danted.conf

# Start Dante SOCKS5 server
/usr/sbin/danted -D &

echo "Dante SOCKS5 server started."

# Apply iptables rules for NAT using iptables-legacy
iptables-legacy -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables-legacy -A FORWARD -i eth0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables-legacy -A FORWARD -i eth0 -o eth0 -j ACCEPT

echo "iptables NAT rules set."

# Keep the container running
exec tail -f /dev/null