54 lines
1.5 KiB
Plaintext
54 lines
1.5 KiB
Plaintext
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#! /bin/bash
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# Adapted from https://github.com/natecarlson/quectel-rgmii-configuration-notes/blob/main/files/ttl-override
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# Uses ttlvalue file to read what ttl should be set to
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if [ -f /usrdata/simplefirewall/ttlvalue ];
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then
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ttlfile=$(</usrdata/simplefirewall/ttlvalue)
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TTLVALUE=$(echo $ttlfile | grep -o "[0-9]\{1,3\}")
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if [ -z "${TTLVALUE}" ]; then
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echo "Couldnt get proper ttl value from file" >&2
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exit 1
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fi
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else
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# Couldnt find ttlvalue file, lets generate one with 0 ttlvalue (0 = disabled)
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touch /usrdata/simplefirewall/ttlvalue && echo '0' > /usrdata/simplefirewall/ttlvalue
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exit 1
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fi
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case "$1" in
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start)
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if (( $TTLVALUE > 0 )); then
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echo "Adding TTL override rules: "
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iptables -t mangle -I POSTROUTING -o rmnet+ -j TTL --ttl-set ${TTLVALUE}
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ip6tables -t mangle -I POSTROUTING -o rmnet+ -j HL --hl-set ${TTLVALUE}
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else
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echo "TTLVALUE set to 0, nothing to do..."
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fi
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echo "done"
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;;
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stop)
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if (( $TTLVALUE > 0 )); then
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echo "Removing TTL override rules: "
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iptables -t mangle -D POSTROUTING -o rmnet+ -j TTL --ttl-set ${TTLVALUE} &>/dev/null || true
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ip6tables -t mangle -D POSTROUTING -o rmnet+ -j HL --hl-set ${TTLVALUE} &>/dev/null || true
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else
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echo "TTLVALUE set to 0, nothing to do..."
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fi
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echo "done"
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;;
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restart)
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$0 stop
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$0 start
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;;
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*)
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echo "Usage ttl-override { start | stop | restart }" >&2
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exit 1
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;;
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esac
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exit 0
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