dceconf.l

Ho Chi Minh City University of Technology Computer Science Department Distributed Computing E

%{
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "dce_def.h"
#define PORT  1
#define MADDR 2
#define EQUAL 3
#define NUM   4
#define ADDR  5
#define TIME  6

int  TIMEOUT_IAMALIVE;

%}

%%

\#  while (input()!='\n');
\=  return EQUAL;
maddr return MADDR;
mport return PORT;
time  return TIME;
[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+  return ADDR;
[0-9]+   return NUM;
[\b|\n|\t]* {}

%%
int
dce_readconf (u_long * maddr, int *mport)
{
  static int nPort;
  static u_long uAddr;
  int nToken;
  char buf[256];
  if (nPort)
    {
      *maddr = uAddr;
      *mport = nPort;
      return 1;
    }
  sprintf (buf, "%s/dce.conf", getenv ("DCE_ROOT"));
  if ((yyin = fopen (buf, "rt")))
    while ((nToken = yylex ()) > 0)
      switch (nToken)
	{
	case MADDR:
	  if ((yylex () == EQUAL) && (yylex () == ADDR))
	    uAddr = inet_addr (yytext);
	  break;
	case PORT:
	  if ((yylex () == EQUAL) && (yylex () == NUM))
	    nPort = atol (yytext);
	  break;
	case TIME:  
	  if ((yylex()==EQUAL) && (yylex () == NUM))
	  TIMEOUT_IAMALIVE = atoi (yytext);
	  break;  
	}
  if (yyin)
    fclose (yyin);
  if ((IN_MULTICAST (ntohl (uAddr))) && (nPort > 1024))
    {
      *maddr = uAddr;
      *mport = nPort;
      if (TIMEOUT_IAMALIVE<_TIMEOUT_IAMALIVE) TIMEOUT_IAMALIVE=_TIMEOUT_IAMALIVE;
      return 1;
    }
  fprintf (stderr, "Error in Read file %s or DCE_ROOT variable not found\n", buf);
  exit (-1);
}