fix(toolbox): Correctly print unix sockets with no path

Correctly print unix sockets with no path.

SDB-10742

Author: ItsLifeJim

toolbox/net/Endpoint.hpp

@@ -70,11 +70,16 @@ template <typename StreamT, typename T>
 StreamT& print_unix_endpoint(StreamT& os, const T& ep)
 {
     constexpr const char* scheme = "unix://";
-    // abstract unix socket's path starts with '\0' and not null-terminated
     const auto* path = reinterpret_cast<const sockaddr_un*>(ep.data())->sun_path;
     if (path[0] == '\0') {
-        size_t size = ep.size() - sizeof(std::declval<sockaddr_un>().sun_family) - 1;
-        os << scheme << '|' << std::string_view{path + 1, size};
+        int size = ep.size() - sizeof(std::declval<sockaddr_un>().sun_family) - 1;
+        if (size <= 0) {
+            // No path
+            os << scheme;
+            return os;
+        }
+        // abstract unix socket's path starts with '\0' and not null-terminated
+        os << scheme << '|' << std::string_view{path + 1, static_cast<std::size_t>(size)};
         return os;
     }
     os << scheme << *ep.data();

toolbox/net/Endpoint.ut.cpp

@@ -179,6 +179,18 @@ BOOST_AUTO_TEST_CASE(ParseStreamUnixAbstractCase)
     BOOST_CHECK_EQUAL(to_string(ep), uri);
 }
 
+BOOST_AUTO_TEST_CASE(ParseStreamUnixEmptyCase)
+{
+    auto sock = os::socket(net::UnixStreamProtocol{});
+    StreamEndpoint ep;
+    get_sock_name(sock.get(), ep);
+
+    BOOST_CHECK_EQUAL(ep.protocol().family(), AF_UNIX);
+    BOOST_CHECK_EQUAL(ep.protocol().type(), SOCK_STREAM);
+    BOOST_CHECK_EQUAL(ep.protocol().protocol(), 0);
+    BOOST_CHECK_EQUAL(to_string(ep), "unix://");
+}
+
 BOOST_AUTO_TEST_CASE(ParseStreamBindCase)
 {
     const auto ep = parse_stream_endpoint("tcp4://:80");