dist/ipf/lib/tcp_flags.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2000-2004 by Darren Reed.
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  * Id: tcp_flags.c,v 1.8.2.1 2006/06/16 17:21:17 darrenr Exp
   9  */
  10
  11 #include "ipf.h"
  12
  13 extern  char    flagset[];
  14 extern  u_char  flags[];
  15
  16
  17 u_char tcp_flags(flgs, mask, linenum)
  18 char *flgs;
  19 u_char *mask;
  20 int    linenum;
  21 {
  22         u_char tcpf = 0, tcpfm = 0;
  23         char *s;
  24
  25         s = strchr(flgs, '/');
  26         if (s)
  27                 *s++ = '\0';
  28
  29         if (*flgs == '0') {
  30                 tcpf = strtol(flgs, NULL, 0);
  31         } else {
  32                 tcpf = tcpflags(flgs);
  33         }
  34
  35         if (s != NULL) {
  36                 if (*s == '0')
  37                         tcpfm = strtol(s, NULL, 0);
  38                 else
  39                         tcpfm = tcpflags(s);
  40         }
  41
  42         if (!tcpfm) {
  43                 if (tcpf == TH_SYN)
  44                         tcpfm = 0xff & ~(TH_ECN|TH_CWR);
  45                 else
  46                         tcpfm = 0xff & ~(TH_ECN);
  47         }
  48         *mask = tcpfm;
  49         return tcpf;
  50 }