usr/src/cmd/ipf/lib/common/addipopt.c

   1 /*
   2  * Copyright (C) 1993-2001 by Darren Reed.
   3  *
   4  * See the IPFILTER.LICENCE file for details on licencing.
   5  *
   6  * $Id: addipopt.c,v 1.7 2002/01/28 06:50:45 darrenr Exp $
   7  */
   8
   9 #include "ipf.h"
  10
  11
  12 int addipopt(op, io, len, class)
  13 char *op;
  14 struct ipopt_names *io;
  15 int len;
  16 char *class;
  17 {
  18         int olen = len;
  19         struct in_addr ipadr;
  20         u_short val;
  21         u_char lvl;
  22         char *s;
  23
  24         if ((len + io->on_siz) > 48) {
  25                 fprintf(stderr, "options too long\n");
  26                 return 0;
  27         }
  28         len += io->on_siz;
  29         *op++ = io->on_value;
  30         if (io->on_siz > 1) {
  31                 s = op;
  32                 *op++ = io->on_siz;
  33                 *op++ = IPOPT_MINOFF;
  34
  35                 if (class) {
  36                         switch (io->on_value)
  37                         {
  38                         case IPOPT_SECURITY :
  39                                 lvl = seclevel(class);
  40                                 *(op - 1) = lvl;
  41                                 break;
  42                         case IPOPT_LSRR :
  43                         case IPOPT_SSRR :
  44                                 ipadr.s_addr = inet_addr(class);
  45                                 s[IPOPT_OLEN] = IPOPT_MINOFF - 1 + 4;
  46                                 bcopy((char *)&ipadr, op, sizeof(ipadr));
  47                                 break;
  48                         case IPOPT_SATID :
  49                                 val = atoi(class);
  50                                 bcopy((char *)&val, op, 2);
  51                                 break;
  52                         }
  53                 }
  54
  55                 op += io->on_siz - 3;
  56                 if (len & 3) {
  57                         *op++ = IPOPT_NOP;
  58                         len++;
  59                 }
  60         }
  61         if (opts & OPT_DEBUG)
  62                 fprintf(stderr, "bo: %s %d %#x: %d\n",
  63                         io->on_name, io->on_value, io->on_bit, len);
  64         return len - olen;
  65 }