dist/ipf/lib/getproto.c

   1 /*      $NetBSD: getproto.c,v 1.4 2007/04/14 20:34:24 martin Exp $      */
   2
   3 /*
   4  * Copyright (C) 2002-2005 by Darren Reed.
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  * Id: getproto.c,v 1.2.2.4 2007/10/27 16:03:38 darrenr Exp
   9  */
  10
  11 #include "ipf.h"
  12
  13 int getproto(name)
  14 char *name;
  15 {
  16         struct protoent *p;
  17         char *s;
  18
  19         for (s = name; *s != '\0'; s++)
  20                 if (!ISDIGIT(*s))
  21                         break;
  22         if (*s == '\0')
  23                 return atoi(name);
  24
  25 #ifdef _AIX51
  26         /*
  27          * For some bogus reason, "ip" is 252 in /etc/protocols on AIX 5
  28          * The IANA has doubled up on the definition of 0 - it is now also
  29          * used for IPv6 hop-opts, so we can no longer rely on /etc/protocols
  30          * providing the correct name->number mapping
  31          */
  32 #endif
  33         if (!strcasecmp(name, "ip"))
  34                 return 0;
  35
  36         p = getprotobyname(name);
  37         if (p != NULL)
  38                 return p->p_proto;
  39         return -1;
  40 }