206 lines
6.3 KiB
Markdown
206 lines
6.3 KiB
Markdown
# Linux-router
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Share your Linux's Internet access to other devices.
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The goal is to easily set/unset your Linux PC/embedded device as a gateway/hotspot/transparent proxy. It wraps the complicated `iptables`, `dnsmasq` etc. stuff. Use in one command, restore by `control-c`.
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It works on wired, wireless and virtual networks.
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## Features
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Basic features:
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- Create a NATed sub-network
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- Share Internet to the sub-network
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- DHCP server
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- DNS server
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- Creating Wifi hotspot:
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- Channel selecting
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- Choose encryptions: WPA2/WPA, WPA2, WPA, No encryption
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- Hidden SSID
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- Create AP on the same interface you are getting Internet (require same channel)
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- Transparent proxy (redsocks)
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- DNS proxy
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**For many other features, see below [CLI usage](#cli-usage-and-other-features)**
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### Useful in these situations
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```
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Internet----(eth0/wlan0)-Linux-(wlanX)AP
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|--client
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|--client
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```
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```
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Internet
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Wifi AP(no DHCP) |
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|----(wlan1)-Linux-(eth0/wlan0)------
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| (DHCP)
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|--client
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|--client
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```
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```
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Internet
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Switch |
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|---(eth1)-Linux-(eth0/wlan0)--------
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|--client
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|--client
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```
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```
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Internet----(eth0/wlan0)-Linux-(eth1)------Another PC
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```
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```
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Internet----(eth0/wlan0)-Linux-(virtual interface)-----VM guests/container guests
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```
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## Usage
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### Share Internet to an interface
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```
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# lnxrouter -i eth1
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```
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### Create Wifi hotspot
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```
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# lnxrouter --ap wlan0 MyAccessPoint --password MyPassPhrase
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```
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### LAN without Internet
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```
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# lnxrouter -i eth1 -n
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# lnxrouter --ap wlan0 MyAccessPoint --password MyPassPhrase -n
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```
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### Transparent proxy with tor
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```
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# lnxrouter -i eth1 --tp 9040 --dns-proxy 9053
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```
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In `torrc`
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```
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TransPort 0.0.0.0:9040
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DNSPort 0.0.0.0:9053
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```
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### Use with LXC
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Create a bridge
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```
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# brctl addbr lxcbr1
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```
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In LXC container `config`
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```
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lxc.network.type = veth
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lxc.network.flags = up
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lxc.network.link = lxcbr1
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lxc.network.hwaddr = xx:xx:xx:xx:xx:xx
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```
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```
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# lnxrouter -i lxcbr1
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```
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### Use with VirtualBox
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On VirtualBox's global settings, create a host-only network `vboxnet1` with DHCP disabled.
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```
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# lnxrouter -i vboxnet1
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```
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### CLI usage and other features
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```
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Usage: lnxrouter [options]
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Options:
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-h, --help Show this help
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--version Print version number
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-i <interface> Interface to share Internet to. An NATed subnet will be made on it.
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To create Wifi hotspot use --ap instead
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-n Disable Internet sharing
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--tp <port> Transparent proxy (redsocks), redirect tcp and udp traffic to port.
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Usually use with --dns-proxy
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-g <gateway> Set Gateway IPv4 address, netmask is /24 (default: 192.168.18.1)
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--dns-proxy <port> Redirect incoming 53 port to DNS proxy port. dnsmasq DNS is disabled
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--no-serve-dns dnsmasq DNS disabled
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--no-dnsmasq Disable dnsmasq server completely (dhcp and dns)
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--log-dns Show dnsmasq DNS server query log
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--dhcp-dns <IP1[,IP2]>|no
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Set DNS offered by DHCP, or no DNS offered (default: gateway as DNS)
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-d DNS server will take into account /etc/hosts
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-e <hosts_file> DNS server will take into account additional hosts file
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--mac <MAC> Set MAC address
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Wifi hotspot options:
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--ap <wlan card interface> <access point name>
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Create Wifi access point using wlan card, and set SSID
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--password <passphrase> Wifi password
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--hidden Make the Access Point hidden (do not broadcast the SSID)
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--no-virt Do not create virtual interface.
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Using this you can't use same wlan card as Internet and AP
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-c <channel> Channel number (default: 1)
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--country <code> Set two-letter country code for regularity (example: US)
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--freq-band <GHz> Set frequency band. Valid inputs: 2.4, 5 (default: 2.4)
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--driver Choose your WiFi adapter driver (default: nl80211)
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-w <WPA version> Use 1 for WPA, use 2 for WPA2, use 1+2 for both (default: 1+2)
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--psk Use 64 hex digits pre-shared-key instead of passphrase
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--mac-filter Enable Wifi hotspot MAC address filtering
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--mac-filter-accept Location of Wifi hotspot MAC address filter list (defaults to /etc/hostapd/hostapd.accept)
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--hostapd-debug <level> With level between 1 and 2, passes arguments -d or -dd to hostapd for debugging.
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--isolate-clients Disable communication between clients
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--ieee80211n Enable IEEE 802.11n (HT)
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--ieee80211ac Enable IEEE 802.11ac (VHT)
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--ht_capab <HT> HT capabilities (default: [HT40+])
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--vht_capab <VHT> VHT capabilities
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--no-haveged Do not run 'haveged' automatically when needed
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Instance managing:
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--daemon Run lnxrouter in the background
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--stop <id> Send stop command to an already running lnxrouter. For an <id>
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you can put the PID of lnxrouter or interface. You can
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get them with --list-running
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--list-running Show the lnxrouter processes that are already running
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--list-clients <id> List the clients connected to lnxrouter instance associated with <id>.
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For an <id> you can put the PID of lnxrouter or interface.
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If virtual WiFi interface was created, then use that one.
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You can get them with --list-running
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Tools:
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--fix-unmanaged If NetworkManager shows your interface as unmanaged after you
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close lnxrouter, then use this option to switch your interface
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back to managed
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```
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## Dependencies
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- bash
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- procps or procps-ng
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- iproute2
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- dnsmasq
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- iptables
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Wifi hotspot:
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- hostapd
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- iw
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- iwconfig (you only need this if 'iw' can not recognize your adapter)
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- haveged (optional)
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## TODO
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- Option to ban private network access
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- IPv6 support
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- Option to random MAC, IP, SSID, password
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- Option to specify out-going interface
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- Option to catch and redirect all dns connections
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## Thanks
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Many thanks to project [create_ap](https://github.com/oblique/create_ap).
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