sqlite instead of file system to store macs

lib/macs.php

@@ -0,0 +1,26 @@
+<?php
+require_once("lib/db.php");
+
+function macs_get() {
+	$results = array();
+	$db = get_db();
+	$q = sqlite_query($db, "select mac from macs where committime > strftime('%s','now') - ".MACFILE_TTL);
+	if (!$q) return $results;
+	while(sqlite_has_more($q)) {
+		$row = sqlite_fetch_array($q, SQLITE_ASSOC);
+		$results[] = $row['mac'];
+	}
+	return $results;
+}
+
+function macs_add($mac) {
+	$db = get_db();
+	$mac = sqlite_escape_string($mac);
+	$q = sqlite_exec($db, "insert into macs values (\"$mac\", strftime('%s','now'))");
+	if (!$q) return $results;
+}
+
+function macs_purge() {
+	$db = get_db();
+	return sqlite_exec($db, "delete from macs where committime <= strftime('%s','now') - ".MACFILE_TTL);
+}