feat(scripts): new-mac

configs/packages/default.nix

@@ -123,6 +123,7 @@ in {
     bc # calculator
     pari # gp -- better calculator
     scripts.infschmv
+    scripts.new-mac # get a new mac address
     scripts.scanned
     scripts.default-gateway
     scripts.showkeys-toggle

packages/scripts/default.nix

@@ -309,6 +309,12 @@ in rec {
     packages = [ pkgs.curl pkgs.pup pkgs.gnused pkgs.gawk pkgs.gnugrep pkgs.fzf ];
   };
 
+  new-mac = wrapScript {
+    script = ./new-mac.sh;
+    name = "new-mac";
+    packages = [ pkgs.gnused pkgs.openssl pkgs.jq pkgs.iproute2 ];
+  };
+
   bvg = pkgs.callPackage ./bvg.nix { };
   nav = pkgs.callPackage ./nav.nix { };
   k-lock = pkgs.callPackage ./k-lock.nix { };

packages/scripts/new-mac.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+random_mac() {
+  openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/.$//'
+}
+
+change_mac() {
+  old_mac="$(ip -j link show "$interface" | jq -r '.[].address')"
+  new_mac="$(random_mac)"
+  ip link set "$interface" address "$new_mac" 2>/dev/null && echo "$old_mac -> $new_mac"
+}
+
+interface="${1:-wlp3s0}"
+ip link set "$interface" down
+until change_mac; do :; done
+ip link set "$interface" up