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#!/bin/env bash
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# Toggle between client/router mode on selected network interface
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# Copyright (C) 2018 Pekka Helenius
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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########################
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# Usage:
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# chmod +x snic.sh
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# and then
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# Wired network interface, example:
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# snic.sh eth0 router // Switch eth0 to router mode
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# snic.sh eth0 client // Switch eth0 to client mode
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# snic.sh wlan0 router wireless // Switch wlan0 to router (Wi-Fi hotspot) mode
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# snic.sh wlan0 client wireless // Switch wlan0 to client mode
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# snic.sh <interface> <mode> <wireless (optional)>
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# <wireless (optional)> should be used only for wireless interfaces!
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########################
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# This script is for network interfaces which do NOT support
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# simultanous Client/Router mode defined in
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# https://archlinux.org/index.php/software_access_point
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########################
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nic=${1}
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for niccheck in $(ls /sys/class/net); do
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if [[ ${nic} == ${niccheck} ]]; then
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nicfound=
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fi
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done
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if [[ ! -v nicfound ]]; then
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echo "No such network interface. Aborting."
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exit 1
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fi
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########################
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if [[ ${2} != "router" ]] || [[ ${2} != "client" ]]; then
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echo "Invalid mode. Use either 'router' or 'client'. Aborting."
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exit 1
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fi
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########################
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# This mode removes dynamically allocated IPv4 address from NIC interface
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# After that we allocate a fixed IPv4 address, defined in
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# /etc/vnic/vnic-<interface>.conf file.
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# After setting up a fixed IPv4 address
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# DHCP server is enabled for the NIC interface
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# Wired: Enable Ethernet router mode
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# Wireless: Enable Wi-Fi hotspot router mode
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#
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if [[ ${2} == "router" ]]; then
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#Do not let NetworkManager interfere our connection on this interface
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sudo nmcli device set ${nic} managed no 2>/dev/null
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sudo systemctl stop snic-dynamic@${nic}
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sudo systemctl restart snic-static@${nic}
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sudo systemctl restart snic-dhcpd4@${nic}
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if [[ ${3} == "wireless" ]]; then
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sudo systemctl restart hostapd
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fi
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fi
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###############
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# This mode removes fixed IPv4 address from NIC interface
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# and reserves the interface for dynamic IPv4 retrieved
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# from a DHCP server
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# Additionally, we stop running DHCP server on the NIC interface
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# Wired: Enable Ethernet client mode
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# Wireless: Enable Wlan client mode
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if [[ ${2} == "client" ]]; then
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#Let NetworkManager handle our connection on this interface
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sudo nmcli device set ${nic} managed yes 2>/dev/null
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sudo systemctl stop snic-static@${nic}
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sudo systemctl restart snic-dynamic@${nic}
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sudo systemctl stop snic-dhcpd4@${nic}
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if [[ ${3} == "wireless" ]]; then
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sudo systemctl stop hostapd
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fi
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fi
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