/* Source: Peterson & Davie (2007), Computer Networks, a Systems Approach,
 *           4th ed., Morgan Kaufmann, p. 35-36.
 * Included stdlib.h, string.h, and strings.h so it compiles on Linux.
 * Changed port from 5432 (postgresql) to 7701 (unassigned).
 * - JLND Feb 7 2009
 */

#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define SERVER_PORT 7701
#define MAX_PENDING 5
#define MAX_LINE 256

int
main()
{
  struct sockaddr_in sin;
  char buf[MAX_LINE];
  int len;
  int s, new_s;

  /* build address data structure */
  bzero((char *)&sin, sizeof(sin));
  sin.sin_family = AF_INET;
  sin.sin_addr.s_addr = INADDR_ANY;
  sin.sin_port = htons(SERVER_PORT);
 
  /* setup passive open */
  if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
    perror("simplex-talk: socket");
    exit(1);
  }
  if ((bind(s, (struct sockaddr *)&sin, sizeof(sin))) < 0) {
    perror("simplex-talk: bind");
    exit(1);
  }
  listen(s, MAX_PENDING);
 
  /* wait for connection, then receive and print text */
  while(1) {
    if ((new_s = accept(s, (struct sockaddr *)&sin, &len)) < 0) {
      perror("simplex-talk: accept");
      exit(1);
    }
    while (len = recv(new_s, buf, sizeof(buf), 0))
      fputs(buf, stdout);	
    close(new_s);
  }
}