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35 lines
1.1 KiB
Bash
35 lines
1.1 KiB
Bash
#!/bin/sh
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# Release IP and shutdown udhcpc.
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# NOTE: Save our resolv.conf to avoid ending up with an empty one, in case the DHCP client wipes it on release (#6424).
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cp -a "/etc/resolv.conf" "/tmp/resolv.ko"
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old_hash="$(md5sum "/etc/resolv.conf" | cut -f1 -d' ')"
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if [ -x "/sbin/dhcpcd" ]; then
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env -u LD_LIBRARY_PATH dhcpcd -d -k "${INTERFACE}"
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killall -q -TERM udhcpc default.script
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else
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killall -q -TERM udhcpc default.script dhcpcd
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ifconfig "${INTERFACE}" 0.0.0.0
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fi
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# NOTE: dhcpcd -k waits for the signalled process to die, but busybox's killall doesn't have a -w, --wait flag,
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# so we have to wait for udhcpc to die ourselves...
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kill_timeout=0
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while pkill -0 udhcpc; do
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# Stop waiting after 5s
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if [ ${kill_timeout} -ge 20 ]; then
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break
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fi
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usleep 250000
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kill_timeout=$((kill_timeout + 1))
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done
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new_hash="$(md5sum "/etc/resolv.conf" | cut -f1 -d' ')"
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# Restore our network-specific resolv.conf if the DHCP client wiped it when releasing the lease...
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if [ "${new_hash}" != "${old_hash}" ]; then
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mv -f "/tmp/resolv.ko" "/etc/resolv.conf"
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else
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rm -f "/tmp/resolv.ko"
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fi
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