134 lines
3.2 KiB
Bash
Executable File
134 lines
3.2 KiB
Bash
Executable File
#!/usr/bin/env zsh
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## This is a home-made network manager. Systems running systemd and dhcpcd are
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## better off running the dhcpcd daemon with
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## /etc/wpa_supplicant/wpa_supplicant.conf configured if needed. See
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## dhcpcd-run-hooks(8).
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##
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## Deps: wpa_supplicant, ccrypt (optional)
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##
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## We need to use wpa_supplicant's unencrypted config file. We store it in a
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## variable to keep it secure, but the 'wpa_supplicant' command requires a
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## file. We cannot use a pipe for that, because in that case the config would be
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## accessible unencrypted. So we need to use an internal path with a syntax like
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## <(...) which is not specified by POSIX. Ksh, bash and Zsh can handle it.
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##
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## Use 'wpa_passphrase ESSID $PW >> /etc/wpa_supplicant.conf', where PW is a
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## variable containing the password. You can set PW securely by using a shell
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## built-in like 'read -s PW'.
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##
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## There is an Emacs plugin for editing crypted files directly. See 'man
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## ccrypt'.
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WSFILE=/etc/wpa_supplicant.conf
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TIMEOUT_LIMIT=500
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USE_DHCP=0
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USE_CRYPT=0
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_usage () {
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cat<<EOF
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Usage: ${1##*/} [OPTIONS]
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Connect to a wireless network.
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-c: Decrypt $WSFILE with ccrypt's ccat command'.
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-d: Use DHCP.
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-h: Show this help.
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-t ITER: Timeout (default: $TIMEOUT_LIMIT).
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-w FILE: Config file for wpa_supplicant (default: $WSFILE).
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EOF
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}
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while getopts ":cdht:w:" opt; do
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case $opt in
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h)
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_usage "$0"
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return 1 ;;
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c)
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USE_CRYPT=1 ;;
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d)
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USE_DHCP=1 ;;
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t)
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TIMEOUT_LIMIT=$OPTARG ;;
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w)
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WSFILE="$OPTARG" ;;
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\?)
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_usage "$0"
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return 1 ;;
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esac
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done
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shift $(($OPTIND - 1))
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if [ $(id -u) -ne 0 ]; then
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echo "You must be root to run this script."
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exit
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fi
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if [ $USE_CRYPT -eq 1 ]; then
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if ! command -v ccat >/dev/null 2>&1; then
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echo >&2 "'ccat' not found in PATH. Exiting."
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exit 1
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fi
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WPA_SUPPLICANT_CONF="$(ccat "$WSFILE")"
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if [ $? -ne 0 ]; then
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echo "Failed to decrypt wpa_supplicant config from $WSFILE."
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exit
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fi
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else
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WPA_SUPPLICANT_CONF="$(cat "$WSFILE")"
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if [ $? -ne 0 ]; then
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echo "Failed to get wpa_supplicant config from $WSFILE."
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exit
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fi
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fi
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## Note: systemd-197 introduced Predictable Network Interface Names, so we need
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## to check for the proper device dynamically.
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## TODO: check if it works on BSD systems.
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NET_INTERFACE=$(ls -1 /sys/class/net | grep -m1 "^wl")
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pkill wpa_supplicant
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if [ "$OSTYPE" = "linux-gnu" ] ; then
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## Clean running processes if any.
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pkill dhcpcd
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## In case network inteface is not up.
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ip link set ${NET_INTERFACE} up
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# Associate if needed.
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if [ "$1" = "-f" ] || [ -z "$(iw dev ${NET_INTERFACE} link | grep SSID)" ]; then
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wpa_supplicant -B -i ${NET_INTERFACE} -D wext -c <(echo "${WPA_SUPPLICANT_CONF}")
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fi
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## Wait until wpa_supplicant has finished association.
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i=0
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while [ -z "$(iw dev ${NET_INTERFACE} link | grep SSID)" ] && [ $i -lt $TIMEOUT_LIMIT ] ; do
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i=$(($i+1))
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done
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## Get IP.
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[ $USE_DHCP -eq 1 ] && dhcpcd ${NET_INTERFACE}
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else
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## BSD
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## Same comments as for Linux.
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pkill dhclient
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ifconfig wlan0 up
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if [ -n "$(ifconfig ${NET_INTERFACE} | grep 'ssid ""')" ]; then
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wpa_supplicant -B -i ${NET_INTERFACE} -c <(echo "${WPA_SUPPLICANT_CONF}")
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fi
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i=0
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while [ -n "$(ifconfig ${NET_INTERFACE} | grep 'ssid ""')" ] && [ $i -lt $TIMEOUT_LIMIT ] ; do
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i=$(($i+1))
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done
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[ $USE_DHCP -eq 1 ] && dhclient ${NET_INTERFACE}
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fi
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