Thread: client / server

I am new to network programming. So far I am just analyzing programs written by others. I have just one computer so I have to use address 127.0.0.1 when running these programs.

When I attempt to run this client (./client 127.0.0.1) I get a 'connection refused' error.

Any suggestions as to why this might occur. Thanks in advance !

Code:

#include "myheader.h"

#define SA struct sockaddr

int
main(int argc, char **argv)
{
 int     sockfd, n;
 char    recvline[MAXLINE + 1];
 struct sockaddr_in servaddr;

 if (argc != 2)
  printf ("Usage: ./client <server address>\n"), exit (1);

 if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
  perror ("Socket error"), exit (1);

 bzero(&servaddr, sizeof(servaddr));
 servaddr.sin_family = AF_INET;
 servaddr.sin_port   = htons(13); /* daytime server */

 if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0)
  printf ("inet_pton error for %s\n", argv[1]), exit (1);

 if (connect(sockfd, (SA *) &servaddr, sizeof(servaddr)) < 0)
  perror ("connect error"), exit (1);

 while ( (n = read(sockfd, recvline, MAXLINE)) > 0) {
  recvline[n] = 0; /* null terminate */
  if (fputs(recvline, stdout) == EOF)
   perror ("fputs error"), exit (1);
 }

 if (n < 0)
  printf ("read error\n"), exit (1);

 exit(0);
}

Here is the code for the server:

Code:

#include "myheader.h"

#define SA struct sockaddr

int
main(int argc, char **argv)
{
 int     listenfd, connfd;
 struct sockaddr_in servaddr;
 char    buff[MAXLINE];
 time_t    ticks;

 listenfd = socket(AF_INET, SOCK_STREAM, 0);

 bzero(&servaddr, sizeof(servaddr));
 servaddr.sin_family      = AF_INET;
 servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
 servaddr.sin_port        = htons(13); /* daytime server */

 bind(listenfd, (SA *) &servaddr, sizeof(servaddr));

 listen(listenfd, 5);

 for ( ; ; ) {
  connfd = accept(listenfd, (SA *) NULL, NULL);

        ticks = time(NULL);
        snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
        write(connfd, buff, strlen(buff));

  close(connfd);
 }
}

PS. myheader.h includes all network include files needed.