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fix: add iptables bypass for container self-traffic #977

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Merged
Mossaka merged 2 commits into from
Feb 19, 2026
Merged

fix: add iptables bypass for container self-traffic #977

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Initial plan
Copilot Feb 19, 2026
f4ff77e
fix: add iptables bypass for container self-traffic
Copilot Feb 19, 2026
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11 changes: 11 additions & 0 deletions containers/agent/setup-iptables.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,17 @@ if [ "$IP6TABLES_AVAILABLE" = true ]; then
ip6tables -t nat -A OUTPUT -d ::1/128 -j RETURN
fi

# Bypass Squid for traffic to the container's own IP.
# Test frameworks often bind servers to 0.0.0.0 and connect via the non-loopback IP
# (e.g., 172.30.0.20). Without this rule, the DNAT redirect rules catch self-directed
# traffic and route it through Squid, which denies it with 403.
AGENT_IP=$(ip -4 addr show eth0 2>/dev/null | awk '/inet / { split($2,a,"/"); print a[1]; exit }')
if [ -n "$AGENT_IP" ] && is_valid_ipv4 "$AGENT_IP"; then
echo "[iptables] Bypass Squid for self-directed traffic (agent IP: ${AGENT_IP})..."
iptables -t nat -A OUTPUT -d "$AGENT_IP" -j RETURN
iptables -A OUTPUT -p tcp -d "$AGENT_IP" -j ACCEPT
fi

# Get DNS servers from environment (default to Google DNS)
DNS_SERVERS="${AWF_DNS_SERVERS:-8.8.8.8,8.8.4.4}"
echo "[iptables] Configuring DNS rules for trusted servers: $DNS_SERVERS"
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