内网回拨方案

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$> git clone https://github.com/ambrop72/badvpn.git 
$> # 因为只需要vpn的，因此加上这些参数（其实我也先把全部功能加上看下有些什么东西，但是我编译不过去！），详细文档可以参看github的文档 
$> cmake .. -DBUILD_NOTHING_BY_DEFAULT=1 -DBUILD_TUN2SOCKS=1 -DBUILD_UDPGW=1
$> make && make install 

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# 创建tun接口
$> ip tuntap add dev tun0 mode tun
# 为其分配ip 
$> ip addr add 10.0.0.1/24 dev tun0
# 启动接口 
$> ip link set tun0 up
# 启动 badvpn_tun2socks socks 转化为 vpn
$> badvpn-tun2socks --tundev tun0 --netif-ipaddr 10.1.0.2 --netif-netmask 255.255.255.0 --socks-server-addr "127.0.0.1:1080"
# 下面操作就和vpn拨号成功后一样了 
# 添加默认路由 serverA 主机同网段的其他主机 
$> ip route add 10.172.11.13 via 10.1.0.2

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$> ssh -4 -N -C -D 1080 <user>@<remote_ip>

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$> ip tuntap add dev tun0 mode tun
$> ip addr add 10.0.0.1/24 dev tun0
$> ip link set tun0 up

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$> badvpn-tun2socks --tundev tun0 --netif-ipaddr 10.1.0.2 --netif-netmask 255.255.255.0 --socks-server-addr "127.0.0.1:1080"

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$> ip route add <other_ip> via 10.1.0.2

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$> vim /usr/local/bin/badvpn-control # 注意执行权限 
#!/bin/bash
################################################# 
#   author      0x5c0f 
#   date        2019-08-13 
#   email       mail@0x5c0f.cc 
#   web         blog.0x5c0f.cc 
#   version     1.0.0
#   last update 2019-08-13
#   descript    Use : ./badvpn-control -h
################################################# 

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

# SOCKS server IP 
SOCKS_SERVER="${SOCKS_HOST}"
# SOCKS port
SOCKS_PORT="${SOCKS_PORT}"
# tun dev 
TUN_NETWORK_DEV="tun0"
# tun ip prefix 
TUN_NETWORK_PREFIX="10.1.0"
# route ip
TUN_ROUTE_IP=($(eval echo ${SOCKS_ROUTE}))

badvpn_start(){
    ip tuntap add dev "${TUN_NETWORK_DEV}" mode tun
    ip addr add "${TUN_NETWORK_PREFIX}.1/24" dev "${TUN_NETWORK_DEV}"
    ip link set "${TUN_NETWORK_DEV}" up
    # add route 
    for _ip in ${TUN_ROUTE_IP[@]}; do
        ip route add "${_ip}" via "${TUN_NETWORK_PREFIX}.2"
    done
    # start badvpn_tun2socks (https://github.com/ambrop72/badvpn.git)
    badvpn-tun2socks --tundev "${TUN_NETWORK_DEV}" --netif-ipaddr "${TUN_NETWORK_PREFIX}.2" --netif-netmask 255.255.255.0 --socks-server-addr "${SOCKS_SERVER}:${SOCKS_PORT}"
}


badvpn_stop(){
    # delete route 
    for _ip in ${TUN_ROUTE_IP[@]}; do
        ip route del "${_ip}" via "${TUN_NETWORK_PREFIX}.2"
    done
    # delete network dev 
    ip link set "${TUN_NETWORK_DEV}" down
    ip addr del "${TUN_NETWORK_PREFIX}.1/24" dev "${TUN_NETWORK_DEV}"
    ip tuntap del dev "${TUN_NETWORK_DEV}" mode tun
}


main(){
    case "$1" in
        "start") 
            badvpn_start
        ;;
        "stop")
            badvpn_stop
        ;;
        *) 
            echo "$0 start|stop"
        ;;
    esac
    
}
main $@ 

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$> vim /usr/lib/systemd/system/socketssh-tun.service

[Unit]
Description=socketssh tun
After=network.target

[Service]
Type=simple
PIDFile=/run/socketssh-tun.pid
ExecStart=/usr/bin/ssh -4 -N -C -D 1080 <user>@<remote_ip>

[Install]
WantedBy=multi-user.target

$> systemctl daemon-reload 
$> systemctl status socketssh-tun.service

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$> vim /etc/sysconfig/badvpn
SOCKS_HOST="127.0.0.1"
SOCKS_PORT="1090"

# 只支持ipv4 
GOLANG_HOST=""

# 支持配置多个 空格隔开   
SOCKS_ROUTE="${GOLANG_HOST}"

$> vim /usr/lib/systemd/system/badvpn-tun2socks.service
[Unit]
Description=badvpn-tun2socks
After=network.target

[Service]
Type=simple
EnvironmentFile=/etc/sysconfig/badvpn
PIDFile=/run/badvpn-tun2socks.pid
ExecStart=/usr/local/bin/badvpn-control start
ExecStopPost=/usr/local/bin/badvpn-control stop

[Install]
WantedBy=multi-user.target

$> systemctl daemon-reload 
$> systemctl status badvpn-tun2socks.service