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https://github.com/tonusoo/koduinternet-cpe
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50 lines
2.5 KiB
Plaintext
50 lines
2.5 KiB
Plaintext
# Title : get-static-ipv4-addrs
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# Last modified date : 11.02.2023
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# Author : Martin Tonusoo
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# Description : Finds the permanent IPv4 addresses configured on the
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# interface and stores those to a variable, which is later
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# processed by dhclient restore-static-ipv4-addrs exit
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# hook script.
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# For example, in case the leased IPv4 address changes or the IPv4
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# address is released by the client(dhclient -r) or the lease
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# expires, then dhclient-script called by dhclient flushes all
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# the IPv4 addresses configured on the interface. This includes
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# IPv4 addresses defined in /etc/network/interfaces or conf
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# files in interfaces.d directory. This script finds the non-dynamic
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# IPv4 addresses configured on the interface and populates the
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# "perm_addrs" variable. Exit hook "restore-static-ipv4-addrs" adds
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# those addresses back to interface based on the content of the
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# "perm_addrs" variable.
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# Options :
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# Notes : Script is meant to be run as a dhclient enter hook.
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# Script is POSIX sh compliant.
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#
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# Routes and aliases("ALIAS DECLARATIONS" in dhclient.conf man)
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# are not touched.
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#
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# Dhclient-script called by dhclient binary always adds IPv4 addresses
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# to non-alias interface with "valid_lft" and "preferred_lft" set
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# which results with a "dynamic" flag set in the output of "ip addr".
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#
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# This script can't help in case the manually configured address is
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# from the same network as the address leased by the DHCP server AND
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# the manually configured address is a secondary one- if the dynamic
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# primary address expires, then both the dynamic primary and all
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# the secondary manually configured addresses are removed by the
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# kernel automatically.
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perm_addrs=""
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while read -r _ _ _ perm_addr _; do
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# Sanity check.
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case "$perm_addr" in
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*.*.*.*/*)
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perm_addrs="$perm_addrs $perm_addr"
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;;
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esac
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done <<-EOF
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$(ip -oneline -4 addr show dev "$interface" permanent label "$interface" 2>/dev/null)
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EOF
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