Add network interface name validation api

include/aws/io/socket.h

@@ -337,6 +337,11 @@ AWS_IO_API int aws_socket_validate_port_for_bind(uint32_t port, enum aws_socket_
  */
 AWS_IO_API void aws_socket_endpoint_init_local_address_for_test(struct aws_socket_endpoint *endpoint);
 
+/**
+ * Validates whether the network interface name is valid. On Windows, it will always return false since we don't support
+ * network_interface_name on Windows */
+AWS_IO_API bool aws_is_network_interface_name_valid(const char *interface_name);
+
 AWS_EXTERN_C_END
 AWS_POP_SANE_WARNING_LEVEL
 

source/posix/socket.c

@@ -2008,3 +2008,11 @@ void aws_socket_endpoint_init_local_address_for_test(struct aws_socket_endpoint
     AWS_FATAL_ASSERT(aws_uuid_to_str(&uuid, &uuid_buf) == AWS_OP_SUCCESS);
     snprintf(endpoint->address, sizeof(endpoint->address), "testsock" PRInSTR ".sock", AWS_BYTE_BUF_PRI(uuid_buf));
 }
+
+bool aws_is_network_interface_name_valid(const char *interface_name) {
+    if (if_nametoindex(interface_name) == 0) {
+        AWS_LOGF_ERROR(AWS_LS_IO_SOCKET, "network_interface_name(%s) is invalid with errno: %d", interface_name, errno);
+        return false;
+    }
+    return true;
+}

source/windows/iocp/socket.c

@@ -3272,3 +3272,9 @@ void aws_socket_endpoint_init_local_address_for_test(struct aws_socket_endpoint
     AWS_FATAL_ASSERT(aws_uuid_to_str(&uuid, &uuid_buf) == AWS_OP_SUCCESS);
     snprintf(endpoint->address, sizeof(endpoint->address), "\\\\.\\pipe\\testsock" PRInSTR, AWS_BYTE_BUF_PRI(uuid_buf));
 }
+
+bool aws_is_network_interface_name_valid(const char *interface_name) {
+    (void)interface_name;
+    AWS_LOGF_ERROR(AWS_LS_IO_SOCKET, "network_interface_names are not supported on Windows");
+    return false;
+}

tests/CMakeLists.txt

@@ -58,6 +58,7 @@ add_net_test_case(tcp_socket_communication)
 add_net_test_case(udp_socket_communication)
 add_net_test_case(test_socket_with_bind_to_interface)
 add_net_test_case(test_socket_with_bind_to_invalid_interface)
+add_net_test_case(test_is_network_interface_name_valid)
 add_test_case(udp_bind_connect_communication)
 add_net_test_case(connect_timeout)
 add_net_test_case(connect_timeout_cancelation)

tests/socket_test.c

@@ -496,6 +496,20 @@ static int s_test_socket_with_bind_to_invalid_interface(struct aws_allocator *al
 }
 AWS_TEST_CASE(test_socket_with_bind_to_invalid_interface, s_test_socket_with_bind_to_invalid_interface)
 
+static int s_test_is_network_interface_name_valid(struct aws_allocator *allocator, void *ctx) {
+    (void)ctx;
+    (void)allocator;
+
+    ASSERT_FALSE(aws_is_network_interface_name_valid("invalid_name"));
+#if defined(AWS_OS_LINUX)
+    ASSERT_TRUE(aws_is_network_interface_name_valid("lo"));
+#elif !defined(AWS_OS_WINDOWS)
+    ASSERT_TRUE(aws_is_network_interface_name_valid("lo0"));
+#endif
+    return AWS_OP_SUCCESS;
+}
+AWS_TEST_CASE(test_is_network_interface_name_valid, s_test_is_network_interface_name_valid)
+
 #if defined(USE_VSOCK)
 static int s_test_vsock_loopback_socket_communication(struct aws_allocator *allocator, void *ctx) {
 /* Without vsock loopback it's difficult to test vsock functionality.