Fix how MAC addresses are handled by the rules parser

It wasn't ignoring separator characters such as the colon and hyphen.
The rules compiler automatically add a colon to separate bytes, which is
not compatible with how they are parsed.

controller/EmbeddedNetworkController.cpp

@@ -315,12 +315,12 @@ static bool _parseRule(json &r,ZT_VirtualNetworkRule &rule)
 		return true;
 	} else if (t == "MATCH_MAC_SOURCE") {
 		rule.t |= ZT_NETWORK_RULE_MATCH_MAC_SOURCE;
-		const std::string mac(OSUtils::jsonString(r["mac"],"0"));
+		const std::string mac(Utils::cleanMac(OSUtils::jsonString(r["mac"],"0")));
 		Utils::unhex(mac.c_str(),(unsigned int)mac.length(),rule.v.mac,6);
 		return true;
 	} else if (t == "MATCH_MAC_DEST") {
 		rule.t |= ZT_NETWORK_RULE_MATCH_MAC_DEST;
-		const std::string mac(OSUtils::jsonString(r["mac"],"0"));
+		const std::string mac(Utils::cleanMac(OSUtils::jsonString(r["mac"],"0")));
 		Utils::unhex(mac.c_str(),(unsigned int)mac.length(),rule.v.mac,6);
 		return true;
 	} else if (t == "MATCH_IPV4_SOURCE") {

node/Utils.hpp

@@ -24,6 +24,7 @@
 #include <stdexcept>
 #include <vector>
 #include <map>
+#include <algorithm>
 
 #if defined(__FreeBSD__)
 #include <sys/endian.h>
@@ -849,6 +850,19 @@ public:
 	 * Hexadecimal characters 0-f
 	 */
 	static const char HEXCHARS[16];
+
+	/*
+	 * Remove `-` and `:` from a MAC address (in-place).
+	 *
+	 * @param mac The MAC address
+	*/
+	static inline void cleanMac(std::string& mac)
+	{
+		auto start = mac.begin();
+		auto end = mac.end();
+		auto new_end = std::remove_if(start, end, [](char c) { return c == 45 || c == 58; });
+		mac.erase(new_end, end);
+	}
 };
 
 } // namespace ZeroTier