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

static struct rr* soa_parse(char *name, long ttl, int type, char *s)
{
    struct rr_soa *rr = getmem(sizeof(*rr));
    long long i;

    rr->mname = extract_name(&s, "mname", 0);
    if (!rr->mname) return NULL;
    rr->rname = extract_name(&s, "rname", 0);
    if (!rr->rname) return NULL;
    i = extract_integer(&s, "serial", NULL);
    if (i < 0) return NULL;
    if (i > 4294967295UL) return bitch("serial is out of range");
    rr->serial = i;
    rr->refresh = extract_timevalue(&s, "refresh");
    if (rr->refresh < 0) return NULL;
    rr->retry = extract_timevalue(&s, "retry");
    if (rr->retry < 0) return NULL;
    rr->expire = extract_timevalue(&s, "expire");
    if (rr->expire < 0) return NULL;
    rr->minimum = extract_timevalue(&s, "minimum");
    if (rr->minimum < 0) return NULL;
    if (ttl < 0 && G.opt.soa_minttl_as_default_ttl) {
        ttl = rr->minimum;
    }
    if (*s) {
        return bitch("garbage after valid SOA data");
    }
    return store_record(type, name, ttl, rr);
}

static char* soa_human(struct rr *rrv)
{
    RRCAST(soa);
    char s[1024];

    snprintf(s, 1024, "%s %s %u %d %d %d %d",
         rr->mname, rr->rname, rr->serial,
         rr->refresh, rr->retry, rr->expire, rr->minimum);
    return quickstrdup_temp(s);
}

static struct binary_data soa_wirerdata(struct rr *rrv)
{
    RRCAST(soa);

    return compose_binary_data("dd44444", 1,
        name2wire_name(rr->mname), name2wire_name(rr->rname),
        rr->serial, rr->refresh, rr->retry,
        rr->expire, rr->minimum);
}

static void *soa_validate(struct rr *rrv)
{
    RRCAST(soa);

    if (strchr(rr->mname, '/') != NULL)
        return moan(rr->rr.file_name, rr->rr.line, "MNAME contains '/'");
    if (strchr(rr->rname, '/') != NULL)
        return moan(rr->rr.file_name, rr->rr.line, "RNAME contains '/'");
    return NULL;
}

struct rr_methods soa_methods = { soa_parse, soa_human, soa_wirerdata, NULL, soa_validate };