lib/common/tcpflags.c

	tcpflags.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * Copyright (C) 1993-2001 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id: tcpflags.c,v 1.3 2002/11/02 07:18:01 darrenr Exp $
 */

#include "ipf.h"


/*
 * ECN is a new addition to TCP - RFC 2481
 */
#ifndef TH_ECN
# define    TH_ECN  0x40
#endif
#ifndef TH_CWR
# define    TH_CWR  0x80
#endif

extern  char    flagset[];
extern  u_char  flags[];


u_char tcpflags(flgs)
char *flgs;
{
    u_char tcpf = 0;
    char *s, *t;

    for (s = flgs; *s; s++) {
        if (*s == 'W')
            tcpf |= TH_CWR;
        else {
            if (!(t = strchr(flagset, *s))) {
                return 0;
            }
            tcpf |= flags[t - flagset];
        }
    }
    return tcpf;
}