mirror of
https://github.com/pi-hole/dnsmasq.git
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119 lines
2.2 KiB
C
119 lines
2.2 KiB
C
/* dnsmasq is Copyright (c) 2000-2018 Simon Kelley
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 dated June, 1991, or
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(at your option) version 3 dated 29 June, 2007.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "dnsmasq.h"
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#ifdef HAVE_DHCP6
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static size_t outpacket_counter;
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void end_opt6(int container)
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{
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void *p = daemon->outpacket.iov_base + container + 2;
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u16 len = outpacket_counter - container - 4 ;
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PUTSHORT(len, p);
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}
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void reset_counter(void)
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{
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/* Clear out buffer when starting from beginning */
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if (daemon->outpacket.iov_base)
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memset(daemon->outpacket.iov_base, 0, daemon->outpacket.iov_len);
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save_counter(0);
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}
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int save_counter(int newval)
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{
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int ret = outpacket_counter;
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if (newval != -1)
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outpacket_counter = newval;
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return ret;
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}
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void *expand(size_t headroom)
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{
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void *ret;
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if (expand_buf(&daemon->outpacket, outpacket_counter + headroom))
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{
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ret = daemon->outpacket.iov_base + outpacket_counter;
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outpacket_counter += headroom;
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return ret;
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}
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return NULL;
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}
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int new_opt6(int opt)
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{
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int ret = outpacket_counter;
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void *p;
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if ((p = expand(4)))
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{
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PUTSHORT(opt, p);
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PUTSHORT(0, p);
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}
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return ret;
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}
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void *put_opt6(void *data, size_t len)
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{
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void *p;
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if ((p = expand(len)) && data)
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memcpy(p, data, len);
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return p;
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}
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void put_opt6_long(unsigned int val)
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{
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void *p;
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if ((p = expand(4)))
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PUTLONG(val, p);
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}
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void put_opt6_short(unsigned int val)
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{
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void *p;
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if ((p = expand(2)))
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PUTSHORT(val, p);
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}
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void put_opt6_char(unsigned int val)
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{
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unsigned char *p;
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if ((p = expand(1)))
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*p = val;
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}
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void put_opt6_string(char *s)
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{
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put_opt6(s, strlen(s));
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}
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#endif
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