47 lines
1.5 KiB
Bash
47 lines
1.5 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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export LC_ALL=C
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RUNTIME_DIR="${HARBOR_RUNTIME_DIR:-$HOME/.vpn-proxy-client/.runtime}"
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STATE_FILE="$RUNTIME_DIR/network.json"
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ROUTE_BIN="${HARBOR_ROUTE_BIN:-/sbin/route}"
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ARP_BIN="${HARBOR_ARP_BIN:-/usr/sbin/arp}"
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NETSTAT_BIN="${HARBOR_NETSTAT_BIN:-/usr/sbin/netstat}"
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route_info="$($ROUTE_BIN -n get default 2>/dev/null || true)"
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gateway="$(awk '/^[[:space:]]*gateway:/{print $2; exit}' <<<"$route_info")"
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network_interface="$(awk '/^[[:space:]]*interface:/{print $2; exit}' <<<"$route_info")"
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if [[ -z "$gateway" || -z "$network_interface" ]]; then
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read -r gateway network_interface < <(
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"$NETSTAT_BIN" -rn -f inet 2>/dev/null \
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| awk '$1 == "default" && $2 ~ /^[0-9]+\./ { print $2, $4; exit }'
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) || true
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fi
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if [[ ! "$gateway" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]]; then
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gateway=""
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network_interface=""
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fi
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if [[ ! "$network_interface" =~ ^[a-zA-Z0-9._-]{1,32}$ ]]; then
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network_interface=""
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fi
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mac=""
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if [[ -n "$gateway" ]]; then
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mac="$($ARP_BIN -n "$gateway" 2>/dev/null | awk '/ at /{print $4; exit}' || true)"
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if [[ ! "$mac" =~ ^[a-fA-F0-9]{2}(:[a-fA-F0-9]{2}){5}$ ]]; then
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mac=""
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else
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mac="$(printf '%s' "$mac" | tr '[:upper:]' '[:lower:]')"
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fi
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fi
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mkdir -p "$RUNTIME_DIR"
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tmp="$(mktemp "${STATE_FILE}.XXXXXX")"
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trap 'rm -f "$tmp"' EXIT
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printf '{"gateway":"%s","interface":"%s","mac":"%s","observedAt":"%s"}\n' \
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"$gateway" "$network_interface" "$mac" "$(date -u '+%Y-%m-%dT%H:%M:%SZ')" > "$tmp"
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mv "$tmp" "$STATE_FILE"
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