From the current connection, without any special rights, get client and host information including connection protocol and addresses

get-connection-client-and-host-information.sql

-- https://dev-doc.blogspot.com/2012/08/ms-sql-2008-client-ip-address-on-shared.html
-- https://blog.sqlauthority.com/2009/05/26/sql-server-find-hostname-and-current-logged-in-user-name/
-- https://blog.sqlauthority.com/2015/07/13/sql-server-how-to-change-server-name/
-- https://social.msdn.microsoft.com/Forums/sqlserver/en-US/6720817d-120f-4099-bf0e-e97fd2e26848/how-to-get-host-name-and-sql-instance-name-by-tsql?forum=transactsql#fc9e6b84-0264-424a-8aef-d03b0de6fade
select
  -- https://docs.microsoft.com/en-us/sql/t-sql/functions/connectionproperty-transact-sql?view=sql-server-2017
  CONNECTIONPROPERTY('net_transport') AS net_transport,
  CONNECTIONPROPERTY('protocol_type') AS protocol_type,
  CONNECTIONPROPERTY('auth_scheme') AS auth_scheme,
  CONNECTIONPROPERTY('local_net_address') AS local_net_address,
  CONNECTIONPROPERTY('local_tcp_port') AS local_tcp_port,
  CONNECTIONPROPERTY('client_net_address') AS client_net_address,
  HOST_NAME() AS client_hostname,
  SUSER_NAME() LoggedInUser,
  @@servername AS 'ServerName\InstanceName',
  -- https://docs.microsoft.com/en-us/sql/t-sql/functions/serverproperty-transact-sql?view=sql-server-2017
  SERVERPROPERTY('ServerName') AS 'ServerName',
  SERVERPROPERTY('MachineName') AS 'Windows_MachineName',
  SERVERPROPERTY('ComputerNamePhysicalNetBIOS') AS 'NetBIOS_Name',
  SERVERPROPERTY('instanceName') AS 'InstanceName',
  SERVERPROPERTY('IsClustered') AS 'IsClustered',
  SERVERPROPERTY('Edition') AS 'Edition',
  -- https://docs.microsoft.com/en-us/sql/t-sql/functions/version-transact-sql-configuration-functions?view=sql-server-2017
  @@Version as 'Full_Server_Version'
;