contrib: add wg-json utility

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

diff --git a/contrib/json/README b/contrib/json/README
new file mode 100644 (file)
index 0000000..dcd128a
--- /dev/null
+++ b/contrib/json/README
@@ -0,0 +1,8 @@
+wg-json
+=======
+
+This will dump all current WireGuard status as JSON output.
+
+Usage:
+
+    # wg-json

diff --git a/contrib/json/wg-json b/contrib/json/wg-json
new file mode 100755 (executable)
index 0000000..90544e2
--- /dev/null
+++ b/contrib/json/wg-json
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+# Copyright (C) 2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+
+exec < <(exec wg show all dump)
+
+printf '{'
+while read -r -d $'\t' device; do
+       if [[ $device != "$last_device" ]]; then
+               [[ -z $last_device ]] && printf '\n' || printf '%s,\n' "$end"
+               last_device="$device"
+               read -r private_key public_key preshared_key listen_port fwmark
+               printf '\t"%s": {' "$device"
+               delim=$'\n'
+               [[ $private_key == "(none)" ]] || { printf '%s\t\t"privateKey": "%s"' "$delim" "$private_key"; delim=$',\n'; }
+               [[ $public_key == "(none)" ]] || { printf '%s\t\t"publicKey": "%s"' "$delim" "$public_key"; delim=$',\n'; }
+               [[ $preshared_key == "(none)" ]] || { printf '%s\t\t"presharedKey": "%s"' "$delim" "$preshared_key"; delim=$',\n'; }
+               [[ $listen_port == "0" ]] || { printf '%s\t\t"listenPort": %u' "$delim" $(( $listen_port )); delim=$',\n'; }
+               [[ $fwmark == "off" ]] || { printf '%s\t\t"fwmark": %u' "$delim" $(( $fwmark )); delim=$',\n'; }
+               printf '%s\t\t"peers": {' "$delim"; end=$'\n\t\t}\n\t}'
+               delim=$'\n'
+       else
+               read -r public_key endpoint allowed_ips latest_handshake transfer_rx transfer_tx persistent_keepalive
+               printf '%s\t\t\t"%s": {' "$delim" "$public_key"
+               delim=$'\n'
+               [[ $endpoint == "(none)" ]] || { printf '%s\t\t\t\t"endpoint": "%s"' "$delim" "$endpoint"; delim=$',\n'; }
+               [[ $latest_handshake == "0" ]] || { printf '%s\t\t\t\t"latestHandshake": %u' "$delim" $(( $latest_handshake )); delim=$',\n'; }
+               [[ $transfer_rx == "0" ]] || { printf '%s\t\t\t\t"transferRx": %u' "$delim" $(( $transfer_rx )); delim=$',\n'; }
+               [[ $transfer_tx == "0" ]] || { printf '%s\t\t\t\t"transferTx": %u' "$delim" $(( $transfer_tx )); delim=$',\n'; }
+               [[ $persistent_keepalive == "off" ]] || { printf '%s\t\t\t\t"persistentKeepalive": %u' "$delim" $(( $persistent_keepalive )); delim=$',\n'; }
+               printf '%s\t\t\t\t"allowedIps": [' "$delim"
+               delim=$'\n'
+               if [[ $allowed_ips != "(none)" ]]; then
+                       old_ifs="$IFS"
+                       IFS=,
+                       for ip in $allowed_ips; do
+                               printf '%s\t\t\t\t\t"%s"' "$delim" "$ip"
+                               delim=$',\n'
+                       done
+                       IFS="$old_ifs"
+                       delim=$'\n'
+               fi
+               printf '%s\t\t\t\t]' "$delim"
+               printf '\n\t\t\t}'
+               delim=$',\n'
+       fi
+
+
+done
+printf '%s\n' "$end"
+printf '}\n'