/*
 * Copyright (C) 2012 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id$
 */

#include "ipf.h"


u_32_t
buildopts(char *cp, char *op, int len)
{
        struct ipopt_names *io;
        u_32_t msk = 0;
        char *s, *t;
        int inc;

        for (s = strtok(cp, ","); s; s = strtok(NULL, ",")) {
                if ((t = strchr(s, '=')))
                        *t++ = '\0';
                else
                        t = "";
                for (io = ionames; io->on_name; io++) {
                        if (strcasecmp(s, io->on_name) || (msk & io->on_bit))
                                continue;
                        if ((inc = addipopt(op, io, len, t))) {
                                op += inc;
                                len += inc;
                        }
                        msk |= io->on_bit;
                        break;
                }
                if (!io->on_name) {
                        fprintf(stderr, "unknown IP option name %s\n", s);
                        return (0);
                }
        }
        while ((len & 3) != 3) {
                *op++ = IPOPT_NOP;
                len++;
        }
        *op++ = IPOPT_EOL;
        len++;
        return (len);
}