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Documentation

• 通过抓包理解 TCP 与 UDP
• 基本 TCP 套接字 API
• 网络编程 I/O 模型
• Linux I/O 多路复用 API：select、poll、epoll

Build and Run

• build

git clone [email protected]:downdemo/Linux-Network-Programming.git
cd Linux-Network-Programming
make

• Service would be generated in build directory

cd build

• Run server before client
• One running server at most because samples use the same port 12345
• Ctrl + c to interrupt blocking server and client process

Run UDP sample

• Run server

./udp_server

• Run client in another shell

./udp_client

Run socket sample

• Run server

./socket_server

• Run client

./socket_client

Run fork sample

• Run server

./fork_server

• Run client multiple times

./fork_client
./fork_client
./fork_client
./fork_client
./fork_client

Run select sample、poll sample、epoll sample

• Run any I/O multiplexing server, such as epoll_server

./epoll_server

• Run multiple I/O multiplexing clients

./select_client
./select_client
./poll_client
./poll_client
./epoll_client
./epoll_client

RFC

• Ethernet：RFC 894, A Standard for the Transmission of IP Datagrams over Ethernet Networks
• ARP：RFC 826, An Ethernet Address Resolution Protocol
• PPP：RFC 1661, The Point-to-Point Protocol (PPP)
• PPPoE：RFC 2516, A Method for Transmitting PPP Over Ethernet (PPPoE)
• ICMPv4：RFC 792, INTERNET CONTROL MESSAGE PROTOCOL
• ICMPv6：RFC 2463, Internet Control Message Protocol (ICMPv6)
• IPv4：RFC 791, INTERNET PROTOCOL
• IPv6：RFC 8200, Internet Protocol, Version 6 (IPv6) Specification
• IGMPv3：RFC 3376, Internet Group Management Protocol, Version 3
• IPSec：RFC 2401, Security Architecture for the Internet Protocol
• PPTP：RFC 2637, Point-to-Point Tunneling Protocol (PPTP)
• L2TP：RFC 2661, Layer Two Tunneling Protocol "L2TP"
• TCP：RFC 793, TRANSMISSION CONTROL PROTOCOL
• UDP：RFC 768, User Datagram Protocol
• SOCKS5: RFC 1928, SOCKS Protocol Version 5
• PNG：RFC 2083, PNG (Portable Network Graphics) Specification Version 1.0
• JSON：RFC 7159, The JavaScript Object Notation (JSON) Data Interchange Format
• SIP：RFC 3261, SIP: Session Initiation Protocol
• RTP：RFC 3550, RTP: A Transport Protocol for Real-Time Applications
• TLS 1.3：RFC 8446, The Transport Layer Security (TLS) Protocol Version 1.3
• HTTP/1.1：RFC 7230, Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
• HTTP/2：RFC 7540, Hypertext Transfer Protocol Version 2 (HTTP/2)
• HTTP/3：RFC 9114, HTTP/3
• QUIC：RFC 9000, QUIC: A UDP-Based Multiplexed and Secure Transport
• HTTPS：RFC 2818, HTTP Over TLS
• WebSocket：RFC 6455, The WebSocket Protocol
• TELNET：RFC 854, TELNET PROTOCOL SPECIFICATION
• SSH：RFC 4254, The Secure Shell (SSH) Connection Protocol
• DNS：RFC 1034, DOMAIN NAMES
• DHCP：RFC 2131, Dynamic Host Configuration Protocol
• NTP：RFC 1305, Network Time Protocol (Version 3)
• FTP：RFC 959, FILE TRANSFER PROTOCOL (FTP)
• NFSv4.2：RFC 7862, Network File System (NFS) Version 4 Minor Version 2 Protocol
• NNTP：RFC 977, Network News Transfer Protocol
• POP3：RFC 1939, Post Office Protocol - Version 3
• IMAP4：RFC 1730, INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4
• SMTP：RFC 2821, Simple Mail Transfer Protocol