Thread: how to install socket server/client???

Server

Code:

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <stdlib.h>

/**
 * ham doc data tu clien va upper string ky tu
 */
void read_from_client(int mysock)
{
    char buff[1024];
    memset(buff, 0, sizeof(buff));
    int rval;
    if((rval = recv(mysock, buff, sizeof(buff), 0))<0)
                    perror("doc stream that bai");
                else
                    if(rval==0)
                        printf("Ending connection\n");
                    else
                    {
                        printf("tin nhan duoc: %s\n", buff);
                        int n = strlen(buff),i;
                        for(i=0;i<n;i++)
                        {
                            buff[i] = toupper(buff[i]);
                        }
                        printf("tin gui tro lai: %s\n", buff);
                    }

                printf("got the message (rval = %d)\n",rval);
                if(send(mysock,buff,sizeof(buff),0)<0)
                {
                    perror("gui nguoc that bai");
                    close(mysock);
                    exit(1);
                }
}

//ham tao ket noi
int make_new_connection(int sock)
{
    int mysock;
    mysock = accept(sock,(struct sockaddr *)0,0);
    return mysock;
}



/**
 * ham tao socket
 */
int make_socket()
{
    int sock;
    struct sockaddr_in server;
    /*Tao socket*/
        sock = socket(AF_INET, SOCK_STREAM, 0);
        if(sock<0){
            perror("Tao socket that bai !");
            exit(1);
        }

    /*Tao thong tin cho socket*/
            server.sin_family = AF_INET;
            server.sin_addr.s_addr = INADDR_ANY;
            server.sin_port = htons(5000);

    /*tai su dung port*/

            int reuse =1;
            setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (int *) &reuse, sizeof(reuse));



    /*Call bind*/
            if(bind(sock, (struct sockaddr *)&server, sizeof(server)))
            {
                    perror("bind that bai");
                    exit(1);
            }
    return sock;
}


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


    /*variables*/
    int sock ;
    int mysock;


    sock = make_socket();
    /*listen*/
            listen(sock, 5);

    /*accept*/
    do{
        if((mysock = make_new_connection(sock))<0)
        {
            perror("ket noi that bai");
            continue;
        }
        else
        {
            read_from_client(mysock);
            close(mysock);
        }

    }while(1);

    return 0;
}

Client

Code:

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

int make_socket(char *addr)
{
    int sock;
    struct sockaddr_in server;
    struct hostent *hp;
    sock = socket(AF_INET, SOCK_STREAM, 0);
    if(sock<0)
    {
        perror("tao socket that bai");
        exit(1);
    }
    server.sin_family = AF_INET;

    /*lay thong tin host*/
    hp = gethostbyname(addr);
    if(hp==0)
    {
        perror("gethostbyname failed");
        close(sock);
        exit(1);
    }
    memcpy(&server.sin_addr, hp->h_addr, hp->h_length);
    server.sin_port = htons(5000);


    /*ket noi server*/
    if(connect(sock, (struct sockaddr *)&server, sizeof(server))<0)
        {
            perror("ket noi that bai");
            exit(1);
        }


    return sock;
}



void gui_nhan_data(int sock)
{
    char buff[1024];
    int rval;
    char *DATA = NULL;
    size_t thesize;


    /*nhap du lieu gui*/
        while(DATA == NULL)
        {
            printf("nhap:");
            getline(&DATA,&thesize,stdin);
            printf("your input is: %s\n", DATA);
            printf("size = %d, sizeof = %d\n", thesize,strlen(DATA));
        }


    /*send data*/

            if(send(sock,DATA,strlen(DATA), 0)<0)
                    {
                        perror("gui that bai");
                        close(sock);
                        exit(1);
                    }
                    printf("tin da gui: %s\n", DATA);


    /*receive data*/
            memset(buff, 0, sizeof(buff));
            if((rval = recv(sock,buff,sizeof(buff),0))<0)
                perror("doc lai that bai");
            else
                if(rval==0)
                {
                    printf("khong co chuoi nao duoc gui");
                }
                else
                {
                    printf("tin nhan lai: %s\n", buff);
                }
}

int main(int argc, char *argv[])
{
    /*khai bao bien*/

    int sock;


    if(argc < 2)
    {
        printf("chua nhap may chu\n");
        return(EXIT_FAILURE);
    }

    if((sock = make_socket(argv[1]))<0)
    {
        printf("tao ket noi that bai !");
    }
    else
    {
        gui_nhan_data(sock);
    }

    close(sock);

    return 0;
}

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