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Socket Programming.md

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Socket Programming.md

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#csnetwk

What is a socket

One end point of a two wat communication link between two programs running on the network Palaging meron port number so TCP layer can identify the application. 2 types: Connection-oriented sockets source ip address source port number dest IP address dest port number uses TCP Connectionless sockets dest IP address dest port number uses UDP

  1. Server runs on a specific computer and has a socket that is bound to a specific port number
    • server
  2. server accepts the connection
    1. upon acceptance the server gets a new socket bound to the same local port and has its remote endpoint set to the address and port of the client
    2. socket is successfully created on the client side and the client can use the socket to communicate the server

check pdf latur

Socket Programming

Socket classes are used tor epresent the connection between a client prograsm and a server program The java.net package provides two classes: socket - client-side connection ServerScoket - server-side connection

Goal : learn how to build client/server applications that communicate using sockets Socket : door between application process and end-to-end transport protocol

2 socket types for two transport services:

  1. UDP: unreliable datagram
  2. TCP: reliable, byte stream-oriented

Socket Programming with UDP

UDP: no persistent connection established between client and servetr no handshaking before sending data sender explicitly attaches IP address and port no. to each packet Receiver extracts sender UP and prt no. from received packet transmitted data may be lost orr ecieved out-of-order Application standpoint: udp provides unreliable transfer of groups of bytes called datagrams between client and server processes AF = address family AF_INET = address family of ipv4 SOCK_DGRAM = datagram socket OS assigns port number automatically

check PDF for syntax in Python

Socket Programming with TCP

Client must contact server server process must first be running server must have created socket that welcomes client's contact Client contacts server by creating tcp socket. specifying ip address port number of pserver process when client creates socket: client TCP establishes connection to server tcp

When conracted by client, server TCP creates new oscjket for server process to communicate with that particular client

  • allows server to talk with multiplke clients
  • client source port no. and ip address used to distinguish clients

Application viewpoint

  • TCP provides reliable in-order- byte streamn "pipe" between client and server processes

UDP creates socket using SOCK_DGRAM while TCP creates socket using SOCK_STREAM