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https://gitlab.alpinelinux.org/alpine/aports.git
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56826afa03
udhcpc doesn't have link beat detection and the purposes of this script
is making udhcpc acquire a new lease when connecting to an access point.
The previous version of this script achieved that goal by running
ifdown/ifup which is pretty ugly and never worked properly (at least
with my setup). A better solution for acquiring a DHCP lease when
connecting to a new AP is sending a SIGUSR1 signal to the udhcpc running
on the affected interfaces, this solution is implemented in this commit.
Together with the wpa_cli OpenRC service added in the previous commit
this makes using udhcpc on laptops very convenient.
See also: cc8f61f633
41 lines
915 B
Bash
41 lines
915 B
Bash
#!/bin/sh
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# Script for using udhcpc (started by ifup) with wpa_supplicant.
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#
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# Distributed under the same license as wpa_supplicant itself.
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# Copyright (c) 2015,2018 Sören Tempel <soeren+alpine@soeren-tempel.net>
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if [ $# -ne 2 ]; then
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logger -t wpa_cli "this script should be called from wpa_cli(8)"
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exit 1
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fi
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IFNAME="${1}"
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ACTION="${2}"
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SIGNAL=""
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DHCPID=""
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# PID file created by the busybox ifup applet for udhcpc.
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DHCPIDFILE="/var/run/udhcpc.${IFNAME}.pid"
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if [ ! -e "${DHCPIDFILE}" ]; then
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logger -t wpa_cli "udhcpc isn't running for interface '${IFNAME}'"
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exit 1
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fi
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logger -t wpa_cli "interface ${IFNAME} ${ACTION}"
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case "${ACTION}" in
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CONNECTED)
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SIGNAL="USR1"
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;;
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DISCONNECTED)
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SIGNAL="USR2"
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;;
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*)
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logger -t wpa_cli "unknown action '${ACTION}'"
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exit 1
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esac
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read -r DHCPID < "${DHCPIDFILE}"
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kill -${SIGNAL} "${DHCPID}" || logger -t wpa_cli \
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"Couldn't send '${SIGNAL}' to '${DHCPID}'"
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