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https://github.com/pi-hole/dnsmasq.git
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37 lines
951 B
Bash
Executable File
37 lines
951 B
Bash
Executable File
#!/bin/bash
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STATUS_FILE="/tmp/dnsmasq-ip-mac.status"
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# Script for dnsmasq lease-change hook.
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# Maintains the above file with a IP address/MAC address pairs,
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# one lease per line. Works with IPv4 and IPv6 leases, file is
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# atomically updated, so no races for users of the data.
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action="$1"
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mac="$2" # IPv4
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ip="$3"
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# ensure it always exists.
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if [ ! -f "$STATUS_FILE" ]; then
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touch "$STATUS_FILE"
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fi
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if [ -n "$DNSMASQ_IAID" ]; then
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mac="$DNSMASQ_MAC" # IPv6
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fi
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# worry about an add or old action when the MAC address is not known:
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# leave any old one in place in that case.
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if [ "$action" = "add" -o "$action" = "old" -o "$action" = "del" ]; then
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if [ -n "$mac" -o "$action" = "del" ]; then
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sed "/^${ip//./\.} / d" "$STATUS_FILE" > "$STATUS_FILE".new
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if [ "$action" = "add" -o "$action" = "old" ]; then
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echo "$ip $mac" >> "$STATUS_FILE".new
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fi
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mv "$STATUS_FILE".new "$STATUS_FILE" # atomic update.
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fi
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fi
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