A TCP/IP Socket Location Server

Listing 3: Partial listing of the socloc server module socloc.c

// file socloc.c

#ifdef OS_WIN32
WSADATA wsaData;
#endif

int server_port = 0;
char s_log_file[128];

struct sloc_entry
   {
   char *service_name;
   char *host_name;
   int port_number;
   char *ip_addr;
   struct sloc_entry *next;
   };

struct sloc_entry *sloc_base;

void main(void)
{
   char localHost[128];
   int isterm;

   if (!srv_initialize())
      exit(4);

   if (!ipc_init(localHost, server_port))
      exit(6);

   while(1)
      {
      if (ipc_server_wait())
         {
         isterm = process_request();
         (void)ipc_close_client();
         }

      if (isterm)
         break;
      }

#ifdef OS_WIN32
      WSACleanup();
#endif

   exit(0);
}

int srv_initialize(void)
{
   char localhost[128], hname[128], ip_ad[128];
   char *thelist;
   int i, ret, nentries, port_num;

   if ((ret = sl_config_read(SL_CONFIG_FILE_NAME)) != SL_OK)
      return(FALSE);

#ifdef OS_WIN32
   if (WSAStartup(WINSOCK_VERSION, &wsaData))
      {
      WSACleanup();
      return(FALSE);
      }
#endif

   if (gethostname(localhost, 127))
      {
#ifdef OS_WIN32
      WSACleanup();
#endif

      return(FALSE);
      }

   if ((ret = sl_config_get_nentries(&nentries)) != SL_OK)
      return(FALSE);

   for(i = 1; i <= nentries; i++)
      {
      if ((ret = sl_config_get_nth(i, hname, &port_num,
          ip_ad)) != SL_OK)
         return(FALSE);

      if (!strcmp(hname, localhost))
         server_port = port_num;
      }

   if (server_port == 0)
      return(FALSE);

   if ((ret = sl_config_set_ils(server_port, TRUE)) != SL_OK)
      return(FALSE);

   sloc_base = SLOC_NULL;

   if ((ret = sloc_find_first_active()) != SL_OK)
      ;
   else
      {
      (void)sloc_bcast_config_add(localhost, server_port,
                                  (char *)NULL);

      if ((thelist = (char *)malloc(SL_MAXCOMMAND))
          == (char *)NULL)
         return(FALSE);

      if ((ret = sloc_config_get_list(thelist)) != SL_OK)
         {
         free(thelist);
         return(FALSE);
         }

      if ((ret = sl_config_put_list(thelist)) != SL_OK)
         {
         free(thelist);
         return(FALSE);
         }

      if ((ret = sl_config_set_ils(server_port, TRUE)) != SL_OK)
         {
         free(thelist);
         return(FALSE);
         }

      if ((ret = sloc_get_list(thelist)) != SL_OK)
         if (ret == SL_NOT_FOUND)
            ;
         else
            {
            free(thelist);
            return(FALSE);
            }

      if (ret == SL_OK)
         if ((ret = s_ll_put_list(thelist)) != SL_OK)
            {
            free(thelist);
            return(FALSE);
            }

      free(thelist);
      }

   sl_config_debug();
   s_ll_debug();
   strcpy(s_log_file, SL_LOG_FILE);
   return(TRUE);
}