Dev/fix port size (#805)

* port datatype changing from int to uint16_t
* throwing for -1 given for uint16_t ports

slsSupportLib/src/network_utils.cpp

@@ -10,6 +10,7 @@
 #include <cstring>
 #include <ifaddrs.h>
 #include <iomanip>
+#include <limits>
 #include <net/if.h>
 #include <netdb.h>
 #include <sstream>
@@ -203,4 +204,18 @@ MacAddr InterfaceNameToMac(const std::string &inf) {
     return MacAddr(mac);
 }
 
+void validatePortNumber(uint16_t port) {
+    // random local port. might work if internal = bad practise
+    if (port == 0) {
+        throw RuntimeError("Invalid port number. Must be between 1 - 65535.");
+    }
+}
+
+void validatePortRange(uint16_t startPort, int numPorts) {
+    validatePortNumber(startPort);
+    if ((startPort + numPorts) > std::numeric_limits<uint16_t>::max()) {
+        throw RuntimeError("Invalid port range. Must be between 1 - 65535.");
+    }
+}
+
 } // namespace sls