TCP Echo Server - Echo Client Program using C


/* tcpechoServer.c */



#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <netdb.h>

#include <stdio.h>

#include <unistd.h>

#include <strings.h>

#include <string.h>



#define MAX_MSG 100

#define SERVER_ADDR "127.0.0.1"

#define SERVER_PORT 3786





 main ( ) {



  int sd, newSd, cliLen, n;



  struct sockaddr_in cliAddr, servAddr;

  char line[MAX_MSG], line_r[MAX_MSG];





  /**********************************/

  /* build server address structure */

  /**********************************/



  bzero((char *)&servAddr, sizeof(servAddr));

  servAddr.sin_family = AF_INET;

  servAddr.sin_addr.s_addr = inet_addr(SERVER_ADDR);

  servAddr.sin_port = htons(SERVER_PORT);



/*

  bzero((char *)&servAddr, sizeof(servAddr));

  servAddr.sin_family = AF_INET;

  inet_aton(SERVER_ADDR, &servAddr.sin_addr);

  servAddr.sin_port = htons(SERVER_PORT);

*/





  /************************/

  /* create stream socket */

  /************************/



  sd = socket(AF_INET, SOCK_STREAM, 0);

  printf("successfully created stream socket \n");



  /**************************/

  /* bind local port number */

  /**************************/



  bind(sd, (struct sockaddr *) &servAddr, sizeof(servAddr));

  printf("bound local port successfully\n");





  /********************************/

  /* specify number of concurrent */

  /* clients to listen for        */

  /********************************/



  listen(sd,5);





  while(1) {



    printf("waiting for client connection on port TCP %u\n",SERVER_PORT);



    /*****************************/

    /* wait for client connection*/

    /*****************************/  



    cliLen = sizeof(cliAddr);

    newSd = accept(sd, (struct sockaddr *) &cliAddr, &cliLen);



    printf("received connection from host [IP %s ,TCP port %d]\n",

                 inet_ntoa(cliAddr.sin_addr), ntohs(cliAddr.sin_port));



    /*****************************/

    /* wait for data from client */

    /*****************************/    

 

    do{

      memset(line,0x0,MAX_MSG);

 

      n=recv(newSd, line, MAX_MSG, 0);

      line[n]='\n';

   

      printf("received from host [IP %s ,TCP port %d] : %s\n",

                 inet_ntoa(cliAddr.sin_addr), ntohs(cliAddr.sin_port), line);

   

      strcpy(line_r,line);

      send(newSd, line_r, strlen(line_r) + 1, 0);

      printf("data echoed (%s)\n", line_r);



    }while(abs(strcmp(line, "quit")));





    /**************************/

    /* close client connection*/

    /**************************/  



    printf("closing connection with host [IP %s ,TCP port %d]\n",

                 inet_ntoa(cliAddr.sin_addr), ntohs(cliAddr.sin_port));



    close(newSd);

  }

}





--------------------------------------------------------------------------------------------





/* tcpechoClient.c */



#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <netdb.h>

#include <stdio.h>

#include <unistd.h>

#include <string.h>

#include <strings.h>





#define MAX_MSG 100

#define SERVER_ADDR "127.0.0.1"

#define CLIENT_ADDR "127.0.0.1"

#define SERVER_PORT 3786

#define CLIENT_PORT 8229



 main () {



  int sd, rc, i, n;

  struct sockaddr_in clientAddr, servAddr;

  char line[MAX_MSG],line_r[MAX_MSG];





  /**********************************/

  /* build server address structure */

  /**********************************/



  bzero((char *)&servAddr, sizeof(servAddr));

  servAddr.sin_family = AF_INET;

  servAddr.sin_addr.s_addr = inet_addr(SERVER_ADDR);

  servAddr.sin_port = htons(SERVER_PORT);



/*

  bzero((char *)&servAddr, sizeof(servAddr));

  servAddr.sin_family = AF_INET;

  inet_aton(SERVER_ADDR, &servAddr.sin_addr);

  servAddr.sin_port = htons(SERVER_PORT);

*/



  /**********************************/

  /* build client address structure */

  /**********************************/



  bzero((char *)&clientAddr, sizeof(clientAddr));

  clientAddr.sin_family = AF_INET;

  clientAddr.sin_addr.s_addr = INADDR_ANY;

  clientAddr.sin_port = htons(0);



/*

  bzero((char *)&clientAddr, sizeof(clientAddr));

  clientAddr.sin_family = AF_INET;

  clientAddr.sin_addr.s_addr = inet_addr(CLIENT_ADDR);

  clientAddr.sin_port = htons(CLIENT_PORT);

*/



  /************************/

  /* create stream socket */

  /************************/



  sd = socket(AF_INET, SOCK_STREAM, 0);

  printf("successfully created stream socket \n");



  /**************************/

  /* bind local port number */

  /**************************/



  bind(sd, (struct sockaddr *) &clientAddr, sizeof(clientAddr));

  printf("bound local port successfully\n");



  /*********************/

  /* connect to server */

  /*********************/



  connect(sd, (struct sockaddr *) &servAddr, sizeof(servAddr));

  printf("connected to server successfully\n");



    /***********************/

    /* send data to server */

    /***********************/



  do{

    printf("Enter string to send to server : ");

    scanf("%s", line);



    send(sd, line, strlen(line) + 1, 0);

    printf("data sent (%s)\n", line);

    n=recv(sd, line_r, MAX_MSG, 0);

      line_r[n]='\n';

 

      printf("received from server [IP %s ,TCP port %d] : %s\n",

                 inet_ntoa(servAddr.sin_addr), ntohs(servAddr.sin_port), line_r);

  }while(strcmp(line, "quit"));





  printf("closing connection with the server\n");

  close(sd);

}



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