contrib/ipfilter/lib/addipopt.c

   1 /*      $FreeBSD$       */
   2
   3 /*
   4  * Copyright (C) 2000-2002 by Darren Reed.
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  * $Id: addipopt.c,v 1.7.4.1 2006/06/16 17:20:56 darrenr Exp $
   9  */
  10
  11 #include "ipf.h"
  12
  13
  14 int addipopt(op, io, len, class)
  15 char *op;
  16 struct ipopt_names *io;
  17 int len;
  18 char *class;
  19 {
  20         int olen = len;
  21         struct in_addr ipadr;
  22         u_short val;
  23         u_char lvl;
  24         char *s;
  25
  26         if ((len + io->on_siz) > 48) {
  27                 fprintf(stderr, "options too long\n");
  28                 return 0;
  29         }
  30         len += io->on_siz;
  31         *op++ = io->on_value;
  32         if (io->on_siz > 1) {
  33                 s = op;
  34                 *op++ = io->on_siz;
  35                 *op++ = IPOPT_MINOFF;
  36
  37                 if (class) {
  38                         switch (io->on_value)
  39                         {
  40                         case IPOPT_SECURITY :
  41                                 lvl = seclevel(class);
  42                                 *(op - 1) = lvl;
  43                                 break;
  44                         case IPOPT_LSRR :
  45                         case IPOPT_SSRR :
  46                                 ipadr.s_addr = inet_addr(class);
  47                                 s[IPOPT_OLEN] = IPOPT_MINOFF - 1 + 4;
  48                                 bcopy((char *)&ipadr, op, sizeof(ipadr));
  49                                 break;
  50                         case IPOPT_SATID :
  51                                 val = atoi(class);
  52                                 bcopy((char *)&val, op, 2);
  53                                 break;
  54                         }
  55                 }
  56
  57                 op += io->on_siz - 3;
  58                 if (len & 3) {
  59                         *op++ = IPOPT_NOP;
  60                         len++;
  61                 }
  62         }
  63         if (opts & OPT_DEBUG)
  64                 fprintf(stderr, "bo: %s %d %#x: %d\n",
  65                         io->on_name, io->on_value, io->on_bit, len);
  66         return len - olen;
  67 }