Get windows host ip in WSL2

.bashrc

# if your default shell is bash, then add this to your .bashrc
export winhost=`grep -G '^nameserver' /etc/resolv.conf | awk '{print $2}'`

config

# this file is an example for how to set a http proxy for git protocol
Host github.com
    HostName github.com
    User git
    ProxyCommand ncat --proxy $winhost:7890 %h %p

config.fish

# if your default shell is fish, then add this to your config.fish
setenv winhost (grep -G '^nameserver' /etc/resolv.conf | awk '{print $2}')

proxychains.sh

#! /bin/sh
# proxychains wrapper

PROXY_PORT=7891 # replace with your socks5 port
PROXY_IP=$winhost
conf=/tmp/proxychains.conf.$$
cat << EOF > $conf
strict_chain
proxy_dns
remote_dns_subnet 224
tcp_read_time_out 15000
tcp_connect_time_out 8000
[ProxyList]
EOF
echo "socks5 $PROXY_IP $PROXY_PORT" >> $conf
trap "rm -f $conf" INT TERM
proxychains -q -f "$conf" "$@"
ec="$?"
rm -f "$conf"

set-winhost.sh

#! /bin/bash
# this script will add `winhost` to your /etc/hosts

rule=$winhost" winhost"
if ! grep -G "winhost$" /etc/hosts  >/dev/null
then
   echo $rule >> /etc/hosts
else
   echo "/winhost$/c$rule"
   sed -i "/winhost$/c$rule" /etc/hosts
fi

winhost.sh

#! /bin/bash
# this script returns your winhost

grep -G '^nameserver' /etc/resolv.conf | awk '{print $2}'