/*
 * Part of DNS zone file validator `validns`.
 *
 * Copyright 2025-2026 OARC, Inc.
 * Copyright 2011-2025 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* ns_parse(char* name, long ttl, int type, char* s)
{
    struct rr_ns* rr = getmem(sizeof(*rr));
    struct rr*    ret_rr;

    rr->nsdname = extract_name(&s, "name server domain name", 0);
    if (!rr->nsdname)
        return NULL;
    if (*s) {
        return bitch("garbage after valid NS data");
    }

    ret_rr = store_record(type, name, ttl, rr);
    if (ret_rr) {
        if (!(ret_rr->rr_set->named_rr->flags & (NAME_FLAG_APEX | NAME_FLAG_DELEGATION))) {
            ret_rr->rr_set->named_rr->flags |= NAME_FLAG_DELEGATION;
            G.stats.delegations++;
        }
    }
    return ret_rr;
}

static char* ns_human(struct rr* rrv)
{
    RRCAST(ns);

    return rr->nsdname;
}

static struct binary_data ns_wirerdata(struct rr* rrv)
{
    RRCAST(ns);
    return name2wire_name(rr->nsdname);
}

static void* ns_validate_set(struct rr_set* rr_set)
{
    struct rr* rr;
    if (G.opt.policy_checks[POLICY_SINGLE_NS]) {
        if (rr_set->count < 2) {
            rr = rr_set->tail;
            return moan(rr->file_name, rr->line, "there should be at least two NS records per name");
        }
    }
    return NULL;
}

static void* ns_validate(struct rr* rrv)
{
    RRCAST(ns);

    if (G.opt.policy_checks[POLICY_NS_ALIAS]) {
        if (find_rr_set(T_CNAME, rr->nsdname)) {
            return moan(rr->rr.file_name, rr->rr.line, "NS data is an alias");
        }
    }
    if (strchr(rr->nsdname, '/') != NULL)
        return moan(rr->rr.file_name, rr->rr.line, "NS data contains '/'");
    return NULL;
}

struct rr_methods ns_methods = { ns_parse, ns_human, ns_wirerdata, ns_validate_set, ns_validate };
