contrib/ipfilter/lib/buildopts.c

   1 /*      $FreeBSD$       */
   2
   3 /*
   4  * Copyright (C) 2012 by Darren Reed.
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  * $Id$
   9  */
  10
  11 #include "ipf.h"
  12
  13
  14 u_32_t buildopts(cp, op, len)
  15         char *cp, *op;
  16         int len;
  17 {
  18         struct ipopt_names *io;
  19         u_32_t msk = 0;
  20         char *s, *t;
  21         int inc;
  22
  23         for (s = strtok(cp, ","); s; s = strtok(NULL, ",")) {
  24                 if ((t = strchr(s, '=')))
  25                         *t++ = '\0';
  26                 else
  27                         t = "";
  28                 for (io = ionames; io->on_name; io++) {
  29                         if (strcasecmp(s, io->on_name) || (msk & io->on_bit))
  30                                 continue;
  31                         if ((inc = addipopt(op, io, len, t))) {
  32                                 op += inc;
  33                                 len += inc;
  34                         }
  35                         msk |= io->on_bit;
  36                         break;
  37                 }
  38                 if (!io->on_name) {
  39                         fprintf(stderr, "unknown IP option name %s\n", s);
  40                         return 0;
  41                 }
  42         }
  43         while ((len & 3) != 3) {
  44                 *op++ = IPOPT_NOP;
  45                 len++;
  46         }
  47         *op++ = IPOPT_EOL;
  48         len++;
  49         return len;
  50 }