dhcid.c

/*
 * Part of DNS zone file validator `validns`.
 *
 * Copyright 2011-2014 Anton Berezin <tobez@tobez.org>
 * Modified BSD license.
 * (See LICENSE file in the distribution.)
 *
 */
#include <sys/types.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <ctype.h>

#include "common.h"
#include "textparse.h"
#include "mempool.h"
#include "carp.h"
#include "rr.h"

static struct rr* dhcid_parse(char *name, long ttl, int type, char *s)
{
    struct rr_dhcid *rr = getmem(sizeof(*rr));
    struct binary_data data;

    data = extract_base64_binary_data(&s, "rdata");
    if (data.length < 0)    return NULL;

    if (data.length < 3)
        return bitch("rdata too short");

    rr->id_type = data.data[0]*256 + data.data[1];
    if (rr->id_type > 2)
        return bitch("unsupported identifier type %s", rr->id_type);

    rr->digest_type = data.data[2];
    if (rr->digest_type != 1)
        return bitch("unsupported digest type %s", rr->digest_type);

    if (data.length != 35)
        return bitch("wrong digest length, must be 32 for SHA-256");

    /* let's cheat a bit */
    data.length -= 3;
    data.data += 3;
    rr->digest = data;

    if (*s) {
        return bitch("garbage after valid DHCID data");
    }
    return store_record(type, name, ttl, rr);
}

static char* dhcid_human(struct rr *rrv)
{
    return "...";
}

static struct binary_data dhcid_wirerdata(struct rr *rrv)
{
    RRCAST(dhcid);

    return compose_binary_data("21d", 1,
        rr->id_type, rr->digest_type, rr->digest);
}

struct rr_methods dhcid_methods = { dhcid_parse, dhcid_human, dhcid_wirerdata, NULL, NULL };