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Presentation transcript:

27

Review of Last Lecture Thread synchronisation Kernel Objects: Synchronisation Objects

Introduction to Network Programming Concept of a packet of information IP addresses and ports The structure of an IP packet What is a protocol? Connection-oriented vs. datagram protocols IP, TCP and UDP HTTP, other wrapper protocols

Well-known port numbers 80 http 25 SMTP 110 POP3 43 WHOIS 53 DNS 21 FTP

Introduction to Network Programming DNS: Domain Name System example http://www.vu.edu.pk/ could be http:// 58.27.140.133 / Hostnames of machines Address resolution: ARP and RARP

Well-known hostnames on the internet www.vu.edu.pk 203.215.177.33 www.yahoo.com 64.58.76.179 www.most.gov.pk 66.96.232.41 www.pak.gov.pk 66.197.42.253 www.google.com 216.239.53.100 www.whois.net 128.121.95.59

Windows Sockets An object that represents an endpoint for communication between processes across a network transport. Sockets have a datagram or stream type and can be bound to a specific network address. Windows Sockets provides an application programming interface (API) for handling all types of socket connections in Windows. The BSD sockets on UNIX Concept of client and server

Windows Sockets: HTTP Web browser as an HTTP client application What is HTTP? Structure of URL: protocol, hostname, document name http://www.vu.edu.pk/default.htm

Basic socket operations Create an unbound socket Server Client bind connect listen accept send receive receive send

Windows Sockets Library File Purpose ws2_32.dll Main WinSock 2 DLL wsock32.dll For WinSock 1.1 support, 32-bit applications mswsock.dll MS extensions to WinSock winsock.dll For WinSock 1.1 support, 16-bit applications ws2help.dll WinSock2 helper ws2tcpip.dll WinSock 2 helper for TCP/IP stacks

Initialise WinSock int WSAStartup( WORD wVersionRequested, LPWSADATA lpWSAData ); WinSock version: high-order byte specifies the minor version (revision) number; the low-order byte specifies the major version number.

The socket descriptor: SOCKET is in fact, a simple 2-byte integer Initialise WinSock SOCKET socket( int af, int type, SOCK_STREAM, SOCK_DGRAM int protocol IPROTO_TCP, IPROTO_IP ); The socket descriptor: SOCKET is in fact, a simple 2-byte integer