tcpClient.c

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/******************************************************************************/
/* This file has been written by Sergio Perez Alcañiz <serpeal@disca.upv.es>  */
/*            Departamento de Informática de Sistemas y Computadores          */
/*            Universidad Politécnica de Valencia                             */
/*            Valencia (Spain)                                                */
/*                                                                            */
/* The RTL-lwIP project has been supported by the Spanish Government Research */
/* Office (CICYT) under grant TIC2002-04123-C03-03                            */
/******************************************************************************/

#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> /* close */

#define SERVER_PORT 7
#define MAX_MSG 100

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

  int sd, rc, i;
  struct sockaddr_in localAddr, servAddr;
  struct hostent *h;
  
  if(argc < 3) {
    printf("usage: %s <server> <data1> <data2> ... <dataN>\n",argv[0]);
    exit(1);
  }

  h = gethostbyname(argv[1]);
  if(h==NULL) {
    printf("%s: unknown host '%s'\n",argv[0],argv[1]);
    exit(1);
  }

  servAddr.sin_family = h->h_addrtype;
  memcpy((char *) &servAddr.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
  servAddr.sin_port = htons(SERVER_PORT);

  /* create socket */
  sd = socket(AF_INET, SOCK_STREAM, 0);
  if(sd<0) {
    perror("cannot open socket ");
    exit(1);
  }

  /* bind any port number */
  localAddr.sin_family = AF_INET;
  localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
  localAddr.sin_port = htons(0);
  
  rc = bind(sd, (struct sockaddr *) &localAddr, sizeof(localAddr));
  if(rc<0) {
    printf("%s: cannot bind port TCP %u\n",argv[0],SERVER_PORT);
    perror("error ");
    exit(1);
  }
                                
  /* connect to server */
  rc = connect(sd, (struct sockaddr *) &servAddr, sizeof(servAddr));
  if(rc<0) {
    perror("cannot connect ");
    exit(1);
  }

  for(i=2;i<argc;i++) {
    
    rc = send(sd, argv[i], strlen(argv[i]) + 1, 0);
    
    if(rc<0) {
      perror("cannot send data ");
      close(sd);
      exit(1);
    
    }

    printf("%s: data%u sent (%s)\n",argv[0],i-1,argv[i]);

   
  }
        
  close(sd);

return 0;
  
}

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