Lect-16 (Socket Implementation)

TCP Server Socket

#include “sys/socket.h> “

#include “netinet/in.h”

#include “arpa/inet.h”

#include “stdio.h”

#include “stdlib.h”

#include “unistd.h”

#include “errno.h”

#include “string.h”

#include “sys/types.h”

#include “time.h”

int main(int argc, char *argv[])

{

    int listenfd = 0, connfd = 0;

    struct sockaddr_in serv_addr;

    char sendBuff[1025];

    time_t ticks;

    listenfd = socket(AF_INET, SOCK_STREAM, 0);

    memset(&serv_addr, '0', sizeof(serv_addr));

    memset(sendBuff, '0', sizeof(sendBuff));

    serv_addr.sin_family = AF_INET;

    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    serv_addr.sin_port = htons(5000);

    bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));

    listen(listenfd, 10);

    while(1)

    {

        connfd = accept(listenfd, (struct sockaddr*)NULL, NULL);

        ticks = time(NULL);

        snprintf(sendBuff, sizeof(sendBuff), "%.24s\r\n", ctime(&ticks));

        write(connfd, sendBuff, strlen(sendBuff));

        close(connfd);

        sleep(1);

     }

}

TCP Client Socket

#include “sys/socket.h> “

#include “netinet/in.h”

#include “arpa/inet.h”

#include “stdio.h”

#include “stdlib.h”

#include “unistd.h”

#include “errno.h”

#include “string.h”

#include “sys/types.h”

#include “time.h”

int main(int argc, char *argv[])

{

    int sockfd = 0, n = 0;

    char recvBuff[1024];

    struct sockaddr_in serv_addr;

    if(argc != 2)

    {

        printf("\n Usage: %s \n",argv[0]);

        return 1;

    }

    memset(recvBuff, '0',sizeof(recvBuff));

    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)

    {

        printf("\n Error : Could not create socket \n");

        return 1;

    }

   memset(&serv_addr, '0', sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;

    serv_addr.sin_port = htons(5000);

    if(inet_pton(AF_INET, argv[1], &serv_addr.sin_addr)<=0)

    {

        printf("\n inet_pton error occured\n");

        return 1;

    }

    if( connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)

    {

       printf("\n Error : Connect Failed \n");

       return 1;

    }

    while ( (n = read(sockfd, recvBuff, sizeof(recvBuff)-1)) > 0)

    {

        recvBuff[n] = 0;

        if(fputs(recvBuff, stdout) == EOF)

        {

            printf("\n Error : Fputs error\n");

        }

    }

    if(n < 0)

    {

       printf("\n Read error \n");

    }

    return 0;

}

Compile and Run

Firstly Compile and Run the server file on Terminal 1.

Now Compile and Run the client file in Terminal 2, with server IP address.

Now Run client on Terminal 2

$ ./a.out 127.0.0.1 (For same M/C)

Output:

Sun Dec  18 22:22:14 2011on the its socket descriptor.