sbin/ipf/libipf/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
  15 buildopts(char *cp, char *op, int len)
  16 {
  17         struct ipopt_names *io;
  18         u_32_t msk = 0;
  19         char *s, *t;
  20         int inc;
  21
  22         for (s = strtok(cp, ","); s; s = strtok(NULL, ",")) {
  23                 if ((t = strchr(s, '=')))
  24                         *t++ = '\0';
  25                 else
  26                         t = "";
  27                 for (io = ionames; io->on_name; io++) {
  28                         if (strcasecmp(s, io->on_name) || (msk & io->on_bit))
  29                                 continue;
  30                         if ((inc = addipopt(op, io, len, t))) {
  31                                 op += inc;
  32                                 len += inc;
  33                         }
  34                         msk |= io->on_bit;
  35                         break;
  36                 }
  37                 if (!io->on_name) {
  38                         fprintf(stderr, "unknown IP option name %s\n", s);
  39                         return (0);
  40                 }
  41         }
  42         while ((len & 3) != 3) {
  43                 *op++ = IPOPT_NOP;
  44                 len++;
  45         }
  46         *op++ = IPOPT_EOL;
  47         len++;
  48         return (len);
  49 }