This chapter has given you a working knowledge of the TCP wrapper concept. Applying the wrapper concept, you can now use it on servers that you write to provide your system with greater network security. You have also learned that it has a weakness in the datagram case, which requires special consideration.
In the next chapter, you will be introduced to one more security-related concept. There, you will learn how to receive credentials from a PF_UNIX/PF_LOCAL socket. Additionally, you will learn how a server can open a file on your behalf and pass the opened file descriptor to you, by means of a PF_UNIX/PF_LOCAL socket.