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better gw script

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This commit is contained in:
ilya 2025-10-29 17:39:54 +01:00
parent 3d28041460
commit 56f9678a2c
1 changed files with 34 additions and 21 deletions
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53
gw.sh
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@ -8,7 +8,7 @@ sumary="$0 [options]"
usage[l]="Locale iface" usage[l]="Locale iface"
varia[l]=local_iface varia[l]=local_iface
usage[w]="wan iface (must be already configured)" usage[w]="wan iface (must be already configured. If you want the local net to have internet access, you need to put your gw here)"
varia[w]=wan_iface varia[w]=wan_iface
wan_iface= wan_iface=
@ -48,32 +48,46 @@ fi
root_or_die root_or_die
run nmcli device set "$local_iface" managed no run nmcli device set $local_iface managed no
clean "nmcli device set "$local_iface" managed yes" clean "nmcli device set $local_iface managed yes"
run ip a add "$net.$host_ip/$netmask" dev "$local_iface" run ip a add $net.$host_ip/$netmask dev $local_iface
clean "ip a del "$net.$host_ip/$netmask" dev $local_iface" clean "ip a del $net.$host_ip/$netmask dev $local_iface"
if [ -z "$wan_iface" ] ; then if [ -n "$wan_iface" ] ; then
old_value="$(sysctl net.ipv4.ip_forward)"
run sysctl net.ipv4.ip_forward=1 run sysctl net.ipv4.ip_forward=1
clean "sysctl net.ipv4.ip_forward=0" clean "sysctl net.ipv4.ip_forward=$old_value"
run iptables -A OUTPUT -d $net.0/$netmask -j ACCEPT # Allow paquets to local network
run iptables -A INPUT -s $net.0/$netmask -j ACCEPT run iptables -A OUTPUT -d $net.0/$netmask -o $local_iface -j ACCEPT
run iptables -A INPUT -s 255.255.255.255 -j ACCEPT clean "iptables -D OUTPUT -d $net.0/$netmask -o $local_iface -j ACCEPT"
run iptables -A INPUT -i "$local_iface" -j ACCEPT
run iptables -t nat -A POSTROUTING -o "$wan_iface" -j MASQUERADE # Allow input from local network
run iptables -A FORWARD -i "$wan_iface" -o "$local_iface" -m state --state RELATED,ESTABLISHED -j ACCEPT run iptables -A INPUT -s $net.0/$netmask -i $local_iface -j ACCEPT
run iptables -A FORWARD -i "$local_iface" -o "$wan_iface" -j ACCEPT clean "iptables -D INPUT -s $net.0/$netmask -i $local_iface -j ACCEPT"
# Nat paquets from local network
run iptables -t nat -A POSTROUTING -s $net.0/$netmask -j MASQUERADE
clean "iptables -t nat -D POSTROUTING -s $net.0/$netmask -j MASQUERADE"
# Allow related paquets to come back in local network
run iptables -A FORWARD -o $local_iface -m state --state RELATED,ESTABLISHED -j ACCEPT
clean "iptables -D FORWARD -o $local_iface -m state --state RELATED,ESTABLISHED -j ACCEPT"
# Forward paquets from local net
run iptables -A FORWARD -i $local_iface -j ACCEPT
clean "iptables -D FORWARD -i $local_iface -j ACCEPT"
fi fi
if $enable_dhcp ; then if $enable_dhcp ; then
# For dhcp offers # For dhcp offers
run iptables -A OUTPUT -d 255.255.255.255/32 -j ACCEPT run iptables -A OUTPUT -d 255.255.255.255/32 -j ACCEPT
clean "iptables -D OUTPUT -d 255.255.255.255/32 -j ACCEPT"
run iptables -A INPUT -s 255.255.255.255 -j ACCEPT
clean "iptables -D INPUT -s 255.255.255.255 -j ACCEPT"
run dnsmasq "--dhcp-range=$net.100,$net.199,1m" --server=9.9.9.9 -q --listen-address "$net.$host_ip" --interface "$local_iface" -p0 -d & start dnsmasq "--dhcp-range=$net.100,$net.199,1m" --server=9.9.9.9 -q --listen-address "$net.$host_ip" --interface "$local_iface" -p0 -d
clean "kill %1"
fi fi
@ -90,13 +104,12 @@ if $enable_hostapd ; then
wpa_passphrase=$psk wpa_passphrase=$psk
wpa_key_mgmt=WPA-PSK WPA-EAP wpa_key_mgmt=WPA-PSK WPA-EAP
EOF EOF
hostapd -d "$hostapd_config" & start hostapd -d "$hostapd_config"
clean "kill %2"
fi fi
echo "PRESS CTRL+C TO QUIT" echo "PRESS CTRL+C TO QUIT"
while true ; do while : ; do
sleep 100000000 sleep infinity
done done
clean clean