First unit tests

Bugs that still remain:

• The socketaddr factory (DNS lookup) does not yet seam to be fully functional.
• UDP socket test needs to pass
• TCP socket test needs to pass
• Unit Test for socketaddr Factory lookups
• Segfault at test shutdown needs to be fixed.
• fcntl needs to be checked for correct flag retuns

src/net/address.hpp

@@ -310,8 +310,8 @@ static constexpr void inet6_array_to_saddr(std::array<uint16_t, 8> const &ip6_co
     for (size_t i = 0; i < ip6_comps.size(); i++) {
         uint16_t hexlet = ip6_comps[i];
 
-        in6.s6_addr[i * 2] = hexlet >> 8;
-        in6.s6_addr[i * 2 + 1] = hexlet & 0xff;
+        in6.s6_addr[i * 2] = static_cast<uint8_t>(hexlet >> 8);
+        in6.s6_addr[i * 2 + 1] = static_cast<uint8_t>(hexlet & 0xff);
     }
 }
 
@@ -479,8 +479,29 @@ static constexpr bool is_valid_ip6addr(const char (&str)[N])
     return details::inet6_aton(str, in6) != -1;
 }
 
+static bool is_valid_ip4addr(const std::string& str)
+{
+    struct in_addr in = {};
+
+    return ::inet_pton(AF_INET, str.c_str(), &in) != -1;
 }
 
+static bool is_valid_ip6addr(const std::string& str)
+{
+    struct in6_addr in = {};
+
+    return ::inet_pton(AF_INET6, str.c_str(), &in) != -1;
+}
+
+}
+
+// Work around use of non-standard feature (not part of ISO-C++)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+#ifdef __clang__
+#pragma GCC diagnostic ignored "-Wgnu-string-literal-operator-template"
+#endif
+
 template <typename CharT, CharT... Cs>
 static constexpr auto operator"" _ipaddr()
 {
@@ -513,6 +534,8 @@ static constexpr auto operator"" _ip6()
     return rmrf::net::inet_pton<AF_INET6>(str);
 }
 
+#pragma GCC diagnostic pop
+
 static constexpr uint16_t operator "" _ipport(unsigned long long port)
 {
     if (port > 65535) {