28 lines
932 B
Bash
28 lines
932 B
Bash
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#!/bin/sh
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set -ex
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if [ -z "$DELAY_MS" ]; then
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echo "Error: DELAY_MS is not set!"
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exit 1
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fi
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ADDR_EXTERNAL=$(ip -json addr show eth0 | jq '.[0].addr_info[0].local' -r)
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SUBNET_INTERNAL=$(ip -json addr show eth1 | jq '.[0].addr_info[0].local + "/" + (.[0].addr_info[0].prefixlen | tostring)' -r)
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# Set up NAT
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nft add table ip nat
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nft add chain ip nat postrouting { type nat hook postrouting priority 100 \; }
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nft add rule ip nat postrouting ip saddr $SUBNET_INTERNAL oifname "eth0" snat $ADDR_EXTERNAL
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# tc can only apply delays on egress traffic. By setting a delay for both eth0 and eth1, we achieve the active delay passed in as a parameter.
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half_of_delay=$(expr "$DELAY_MS" / 2 )
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param="${half_of_delay}ms"
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tc qdisc add dev eth0 root netem delay $param
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tc qdisc add dev eth1 root netem delay $param
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echo "1" > /tmp/setup_done # This will be checked by our docker HEALTHCHECK
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tail -f /dev/null # Keep it running forever.
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