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/* dnsmasq is Copyright (c) 2000-2020 Simon Kelley
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 dated June, 1991, or
(at your option) version 3 dated 29 June, 2007.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dnsmasq.h"
#ifdef HAVE_DHCP6
static size_t outpacket_counter;
void end_opt6(int container)
{
void *p = daemon->outpacket.iov_base + container + 2;
u16 len = outpacket_counter - container - 4 ;
PUTSHORT(len, p);
}
void reset_counter(void)
{
/* Clear out buffer when starting from beginning */
if (daemon->outpacket.iov_base)
memset(daemon->outpacket.iov_base, 0, daemon->outpacket.iov_len);
save_counter(0);
}
int save_counter(int newval)
{
int ret = outpacket_counter;
if (newval != -1)
outpacket_counter = newval;
return ret;
}
void *expand(size_t headroom)
{
void *ret;
if (expand_buf(&daemon->outpacket, outpacket_counter + headroom))
{
ret = daemon->outpacket.iov_base + outpacket_counter;
outpacket_counter += headroom;
return ret;
}
return NULL;
}
int new_opt6(int opt)
{
int ret = outpacket_counter;
void *p;
if ((p = expand(4)))
{
PUTSHORT(opt, p);
PUTSHORT(0, p);
}
return ret;
}
void *put_opt6(void *data, size_t len)
{
void *p;
if ((p = expand(len)) && data)
memcpy(p, data, len);
return p;
}
void put_opt6_long(unsigned int val)
{
void *p;
if ((p = expand(4)))
PUTLONG(val, p);
}
void put_opt6_short(unsigned int val)
{
void *p;
if ((p = expand(2)))
PUTSHORT(val, p);
}
void put_opt6_char(unsigned int val)
{
unsigned char *p;
if ((p = expand(1)))
*p = val;
}
void put_opt6_string(char *s)
{
put_opt6(s, strlen(s));
}
#endif
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