sock_inet_stream_cli_io.c

/*******************************************
* Author     : Diego Cordoba / @d1cor      *
* Purpose    : juncotic.com  / um.edu.ar   *
*******************************************/

/*
    Uso:
        ./cliente ip_servidor puerto
*/


#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<string.h>
#include<fcntl.h>
#include<errno.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include <arpa/inet.h>

#define BUF_SIZE 1024

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

    char *error;

    int sockid, conn_sock, count;
    struct sockaddr_in direccion;
    char buffer[BUF_SIZE];


    //creamos el socket inet-stream
    if((sockid=socket(PF_INET,SOCK_STREAM,0))<0){
        error="socket";
        goto err;
    }


    //seteamos la direccion en la que va a escuchar
    direccion.sin_family=AF_INET; //address family
    direccion.sin_port=htons(atoi(*(argv+2)));
    direccion.sin_addr.s_addr=inet_addr(*(argv+1));


    //establecemos la conexion con el server (syn, syn-ack, ack)
    if(connect(sockid, (struct sockaddr *)&direccion, sizeof(direccion))<0){
        error="connect";
        goto err;
    }

    printf("Conexion establecida!! Soy %d\n",getpid());

    // sockid está asociado al conn_sock del servidor, envio de datos

    while(count=read(STDIN_FILENO,buffer,BUF_SIZE)){

        if((send(sockid, buffer, count, 0))<0){
            error="send";
            goto err;
        }
        printf("%d enviado...\n",getpid());
        if((recv(sockid, buffer, BUF_SIZE,0))<0){
            error="recv";
            goto err;
        }
        printf("%d recibiendo ACK: %s",getpid(),buffer);
    }

    close(sockid);

    return 0;

err:
    fprintf(stderr,"%d %s %s\n",errno,error,strerror(errno));
    exit(1);

}