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Beej's Guide to Network Programming

Beej's Guide to Network Programming

Using Internet Sockets

Brian "Beej Jorgensen" Hall beej@beej.us

Version 3.0.21 June 8, 2016

Copyright © 2015 Brian "Beej Jorgensen" Hall

Contents

1. Intro 1.1. Audience 1.2. Platform and Compiler 1.3. Official Homepage and Books For Sale 1.4. Note for Solaris/SunOS Programmers 1.5. Note for Windows Programmers 1.6. Email Policy 1.7. Mirroring 1.8. Note for Translators 1.9. Copyright and Distribution

2. What is a socket? 2.1. Two Types of Internet Sockets 2.2. Low level Nonsense and Network Theory

3. IP Addresses, structs, and Data Munging 3.1. IP Addresses, versions 4 and 6 3.2. Byte Order 3.3. structs 3.4. IP Addresses, Part Deux

4. Jumping from IPv4 to IPv6

5. System Calls or Bust 5.1. getaddrinfo()Prepare to launch! 5.2. socket()Get the File Descriptor! 5.3. bind()What port am I on? 5.4. connect()Hey, you! 5.5. listen()Will somebody please call me? 5.6. accept()"Thank you for calling port 3490." 5.7. send() and recv()Talk to me, baby! 5.8. sendto() and recvfrom()Talk to me, DGRAM-style 5.9. close() and shutdown()Get outta my face! 5.10. getpeername()Who are you? 5.11. gethostname()Who am I?

6. Client-Server Background 6.1. A Simple Stream Server 6.2. A Simple Stream Client 6.3. Datagram Sockets

7. Slightly Advanced Techniques 7.1. Blocking 7.2. select()Synchronous I/O Multiplexing 7.3. Handling Partial send()s 7.4. SerializationHow to Pack Data 7.5. Son of Data Encapsulation 7.6. Broadcast PacketsHello, World!

8. Common Questions

9. Man Pages 9.1. accept() 9.2. bind() 9.3. connect() 9.4. close() 9.5. getaddrinfo(), freeaddrinfo(), gai_strerror() 9.6. gethostname() 9.7. gethostbyname(), gethostbyaddr() 9.8. getnameinfo() 9.9. getpeername() 9.10. errno 9.11. fcntl() 9.12. htons(), htonl(), ntohs(), ntohl() 9.13. inet_ntoa(), inet_aton(), inet_addr 9.14. inet_ntop(), inet_pton() 9.15. listen() 9.16. perror(), strerror() 9.17. poll() 9.18. recv(), recvfrom() 9.19. select() 9.20. setsockopt(), getsockopt() 9.21. send(), sendto() 9.22. shutdown() 9.23. socket() 9.24. struct sockaddr and pals

10. More References 10.1. Books 10.2. Web References 10.3. RFCs

Index

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