Remove fd dependencies from the local_security_connector (#26290)

src/core/lib/security/security_connector/local/local_security_connector.cc

@@ -29,6 +29,7 @@
 #include <grpc/support/string_util.h>
 
 #include "src/core/ext/filters/client_channel/client_channel.h"
+#include "src/core/lib/address_utils/parse_address.h"
 #include "src/core/lib/address_utils/sockaddr_utils.h"
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/gprpp/ref_counted_ptr.h"
@@ -39,6 +40,7 @@
 #include "src/core/lib/iomgr/unix_sockets_posix.h"
 #include "src/core/lib/security/credentials/local/local_credentials.h"
 #include "src/core/lib/security/transport/security_handshaker.h"
+#include "src/core/lib/uri/uri_parser.h"
 #include "src/core/tsi/local_transport_security.h"
 
 #define GRPC_UDS_URI_PATTERN "unix:"
@@ -70,13 +72,14 @@ void local_check_peer(tsi_peer peer, grpc_endpoint* ep,
                       grpc_core::RefCountedPtr<grpc_auth_context>* auth_context,
                       grpc_closure* on_peer_checked,
                       grpc_local_connect_type type) {
-  int fd = grpc_endpoint_get_fd(ep);
   grpc_resolved_address resolved_addr;
-  memset(&resolved_addr, 0, sizeof(resolved_addr));
-  resolved_addr.len = GRPC_MAX_SOCKADDR_SIZE;
   bool is_endpoint_local = false;
-  if (getsockname(fd, reinterpret_cast<grpc_sockaddr*>(resolved_addr.addr),
+  absl::string_view local_addr = grpc_endpoint_get_local_address(ep);
-                  &resolved_addr.len) == 0) {
+  absl::StatusOr<grpc_core::URI> uri = grpc_core::URI::Parse(local_addr);
+  if (!uri.ok() || !grpc_parse_uri(*uri, &resolved_addr)) {
+    gpr_log(GPR_ERROR, "Could not parse endpoint address: %s",
+            std::string(local_addr.data(), local_addr.size()).c_str());
+  } else {
     grpc_resolved_address addr_normalized;
     grpc_resolved_address* addr =
         grpc_sockaddr_is_v4mapped(&resolved_addr, &addr_normalized)
@@ -103,7 +106,7 @@ void local_check_peer(tsi_peer peer, grpc_endpoint* ep,
       }
     }
   }
-  grpc_error_handle error = GRPC_ERROR_NONE;
+  grpc_error_handle error;
   if (!is_endpoint_local) {
     error = GRPC_ERROR_CREATE_FROM_STATIC_STRING(
         "Endpoint is neither UDS or TCP loopback address.");