it compiles again!

control/NodeControlService.cpp

@@ -226,4 +226,25 @@ void NodeControlService::_doCommand(IpcConnection *ipcc,const char *commandLine)
 	ipcc->printf("."ZT_EOL_S); // blank line ends response
 }
 
+std::string NodeControlService::readOrCreateAuthtoken(const char *path,bool generateIfNotFound)
+{
+	unsigned char randbuf[24];
+	std::string token;
+
+	if (Utils::readFile(path,token))
+		return token;
+	else token = "";
+
+	if (generateIfNotFound) {
+		Utils::getSecureRandom(randbuf,sizeof(randbuf));
+		for(unsigned int i=0;i<sizeof(randbuf);++i)
+			token.push_back(("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")[(unsigned int)randbuf[i] % 62]);
+		if (!Utils::writeFile(path,token))
+			return std::string();
+		Utils::lockDownFile(path,false);
+	}
+
+	return token;
+}
+
 } // namespace ZeroTier

control/NodeControlService.hpp

@@ -69,6 +69,15 @@ public:
 	void threadMain()
 		throw();
 
+	/**
+	 * Load (or generate) the authentication token
+	 *
+	 * @param path Full path to authtoken.secret
+	 * @param generateIfNotFound If true, generate and save if not found or readable
+	 * @return Authentication token or empty string on failure
+	 */
+	static std::string readOrCreateAuthtoken(const char *path,bool generateIfNotFound);
+
 private:
 	static void _CBcommandHandler(void *arg,IpcConnection *ipcc,IpcConnection::EventType event,const char *commandLine);
 	void _doCommand(IpcConnection *ipcc,const char *commandLine);