/* stringtoaddress.c for X3, 24, X4 with usage example SJ */

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

	if (argc == 4)
		join(argv[3]);

	/* ... */

} // main()



/* join another node, a lot of side effetct */
int join(char *hostport)
{
  char buf[MAXBUFLEN];
  int i;
  struct sockaddr_in their_addr; /* connector's address information */

  printf("join: %s\n", hostport);

  stringtoaddress(hostport, &their_addr); 

  for (i = 0; i < knownpeers; i++) {
	  if (sameaddr(their_addr, addresses[i]))
		  return 0;
  }

  addresses[knownpeers++] = their_addr;

  sprintf(buf, "%s %s %s", COMM[JOIN], user, NL);
  ssendto(sockfd, buf, &their_addr);

  printf("Sent join request to %s:%d\n", inet_ntoa(their_addr.sin_addr),
		 ntohs(their_addr.sin_port));

  return 1;
}



// host:port to struct
void stringtoaddress(char *address, struct sockaddr_in *addrstruct) {

  struct hostent *he;
  char *colon, *p = address;
  int port = 0;

  while (*p && isspace(*p)) p++;  // skip space
  
  colon = strchr(p, ':');
  if (colon) {
	  *colon = '\0';
	  port = atoi(colon+1);
  }
  
  if ((he=gethostbyname(p)) == NULL) {
	  perror("gethostbyname");
	  return;
  }

  addrstruct->sin_family = AF_INET;
  addrstruct->sin_port = htons(port);
  addrstruct->sin_addr = *((struct in_addr *)he->h_addr);
  memset(&(addrstruct->sin_zero), '\0', 8);

  if (colon)
      *colon = ':';

} // stringtoaddress