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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/dns/dnsheader.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ 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 of the License. │
│ │
│ 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, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/dns/dnsheader.h"
#include "libc/sysv/errfuns.h"
/**
* Serializes DNS message header to wire.
*
* @return number of bytes written (always 12) or -1 w/ errno
* @see pascalifydnsname()
*/
int serializednsheader(uint8_t *buf, size_t size,
const struct DnsHeader header) {
if (size < 12) return enospc();
buf[0x0] = header.id >> 010u;
buf[0x1] = header.id >> 000u;
buf[0x2] = header.bf1;
buf[0x3] = header.bf2;
buf[0x4] = header.qdcount >> 010u;
buf[0x5] = header.qdcount >> 000u;
buf[0x6] = header.ancount >> 010u;
buf[0x7] = header.ancount >> 000u;
buf[0x8] = header.nscount >> 010u;
buf[0x9] = header.nscount >> 000u;
buf[0xa] = header.arcount >> 010u;
buf[0xb] = header.arcount >> 000u;
return 12;
}
/**
* Serializes DNS message header to wire.
*
* @return number of bytes read (always 12) or -1 w/ errno
*/
int deserializednsheader(struct DnsHeader *header, const uint8_t *buf,
size_t size) {
if (size < 12) return ebadmsg();
header->id = read16be(buf + 0);
header->bf1 = buf[2];
header->bf2 = buf[3];
header->qdcount = read16be(buf + 4);
header->ancount = read16be(buf + 6);
header->nscount = read16be(buf + 8);
header->arcount = read16be(buf + 10);
return 12;
}