DHCP address match and mangler

extensions/mac.c

@@ -0,0 +1,29 @@
+static bool mac_parse(const char *addr, unsigned char *dest, uint8_t *mask)
+{
+	unsigned int i = 0, value;
+	char *end;
+
+	for (i = 0; i < ETH_ALEN; ++i) {
+		value = strtoul(addr, &end, 16);
+		if (addr == end || value > 0xFF)
+			return false;
+		if (i == ETH_ALEN - 1) {
+			if (*end != '\0' && *end != '/')
+				return false;
+		} else if (*end != ':') {
+			return false;
+		}
+		dest[i] = value;
+		addr = end + 1;
+	}
+
+	*mask = 48;
+	if (*end == '/') {
+		if (!strtonum(end + 1, &end, &value, 0, 48))
+			return false;
+		if (*end != '\0')
+			return false;
+	}
+
+	return true;
+}