xref: /freebsd-12-stable/contrib/ldns/dnssec_zone.c

/*
 * special zone file structures and functions for better dnssec handling
 */

#include <ldns/config.h>

#include <ldns/ldns.h>

ldns_dnssec_rrs *
ldns_dnssec_rrs_new(void)
{
	ldns_dnssec_rrs *new_rrs;
	new_rrs = LDNS_MALLOC(ldns_dnssec_rrs);
        if(!new_rrs) return NULL;
	new_rrs->rr = NULL;
	new_rrs->next = NULL;
	return new_rrs;
}

INLINE void
ldns_dnssec_rrs_free_internal(ldns_dnssec_rrs *rrs, int deep)
{
	ldns_dnssec_rrs *next;
	while (rrs) {
		next = rrs->next;
		if (deep) {
			ldns_rr_free(rrs->rr);
		}
		LDNS_FREE(rrs);
		rrs = next;
	}
}

void
ldns_dnssec_rrs_free(ldns_dnssec_rrs *rrs)
{
	ldns_dnssec_rrs_free_internal(rrs, 0);
}

void
ldns_dnssec_rrs_deep_free(ldns_dnssec_rrs *rrs)
{
	ldns_dnssec_rrs_free_internal(rrs, 1);
}

ldns_status
ldns_dnssec_rrs_add_rr(ldns_dnssec_rrs *rrs, ldns_rr *rr)
{
	int cmp;
	ldns_dnssec_rrs *new_rrs;
	if (!rrs || !rr) {
		return LDNS_STATUS_ERR;
	}

	/* this could be done more efficiently; name and type should already
	   be equal */
	cmp = ldns_rr_compare(rrs->rr, rr);
	if (cmp < 0) {
		if (rrs->next) {
			return ldns_dnssec_rrs_add_rr(rrs->next, rr);
		} else {
			new_rrs = ldns_dnssec_rrs_new();
			new_rrs->rr = rr;
			rrs->next = new_rrs;
		}
	} else if (cmp > 0) {
		/* put the current old rr in the new next, put the new
		   rr in the current container */
		new_rrs = ldns_dnssec_rrs_new();
		new_rrs->rr = rrs->rr;
		new_rrs->next = rrs->next;
		rrs->rr = rr;
		rrs->next = new_rrs;
	}
	/* Silently ignore equal rr's */
	return LDNS_STATUS_OK;
}

void
ldns_dnssec_rrs_print_fmt(FILE *out, const ldns_output_format *fmt,
	       const ldns_dnssec_rrs *rrs)
{
	if (!rrs) {
		if ((fmt->flags & LDNS_COMMENT_LAYOUT))
			fprintf(out, "; <void>");
	} else {
		if (rrs->rr) {
			ldns_rr_print_fmt(out, fmt, rrs->rr);
		}
		if (rrs->next) {
			ldns_dnssec_rrs_print_fmt(out, fmt, rrs->next);
		}
	}
}

void
ldns_dnssec_rrs_print(FILE *out, const ldns_dnssec_rrs *rrs)
{
	ldns_dnssec_rrs_print_fmt(out, ldns_output_format_default, rrs);
}


ldns_dnssec_rrsets *
ldns_dnssec_rrsets_new(void)
{
	ldns_dnssec_rrsets *new_rrsets;
	new_rrsets = LDNS_MALLOC(ldns_dnssec_rrsets);
        if(!new_rrsets) return NULL;
	new_rrsets->rrs = NULL;
	new_rrsets->type = 0;
	new_rrsets->signatures = NULL;
	new_rrsets->next = NULL;
	return new_rrsets;
}

INLINE void
ldns_dnssec_rrsets_free_internal(ldns_dnssec_rrsets *rrsets, int deep)
{
	if (rrsets) {
		if (rrsets->rrs) {
			ldns_dnssec_rrs_free_internal(rrsets->rrs, deep);
		}
		if (rrsets->next) {
			ldns_dnssec_rrsets_free_internal(rrsets->next, deep);
		}
		if (rrsets->signatures) {
			ldns_dnssec_rrs_free_internal(rrsets->signatures, deep);
		}
		LDNS_FREE(rrsets);
	}
}

void
ldns_dnssec_rrsets_free(ldns_dnssec_rrsets *rrsets)
{
	ldns_dnssec_rrsets_free_internal(rrsets, 0);
}

void
ldns_dnssec_rrsets_deep_free(ldns_dnssec_rrsets *rrsets)
{
	ldns_dnssec_rrsets_free_internal(rrsets, 1);
}

ldns_rr_type
ldns_dnssec_rrsets_type(const ldns_dnssec_rrsets *rrsets)
{
	if (rrsets) {
		return rrsets->type;
	} else {
		return 0;
	}
}

ldns_status
ldns_dnssec_rrsets_set_type(ldns_dnssec_rrsets *rrsets,
					   ldns_rr_type type)
{
	if (rrsets) {
		rrsets->type = type;
		return LDNS_STATUS_OK;
	}
	return LDNS_STATUS_ERR;
}

static ldns_dnssec_rrsets *
ldns_dnssec_rrsets_new_frm_rr(ldns_rr *rr)
{
	ldns_dnssec_rrsets *new_rrsets;
	ldns_rr_type rr_type;
	bool rrsig;

	new_rrsets = ldns_dnssec_rrsets_new();
	rr_type = ldns_rr_get_type(rr);
	if (rr_type == LDNS_RR_TYPE_RRSIG) {
		rrsig = true;
		rr_type = ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(rr));
	} else {
		rrsig = false;
	}
	if (!rrsig) {
		new_rrsets->rrs = ldns_dnssec_rrs_new();
		new_rrsets->rrs->rr = rr;
	} else {
		new_rrsets->signatures = ldns_dnssec_rrs_new();
		new_rrsets->signatures->rr = rr;
	}
	new_rrsets->type = rr_type;
	return new_rrsets;
}

ldns_status
ldns_dnssec_rrsets_add_rr(ldns_dnssec_rrsets *rrsets, ldns_rr *rr)
{
	ldns_dnssec_rrsets *new_rrsets;
	ldns_rr_type rr_type;
	bool rrsig = false;
	ldns_status result = LDNS_STATUS_OK;

	if (!rrsets || !rr) {
		return LDNS_STATUS_ERR;
	}

	rr_type = ldns_rr_get_type(rr);

	if (rr_type == LDNS_RR_TYPE_RRSIG) {
		rrsig = true;
		rr_type = ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(rr));
	}

	if (!rrsets->rrs && rrsets->type == 0 && !rrsets->signatures) {
		if (!rrsig) {
			rrsets->rrs = ldns_dnssec_rrs_new();
			rrsets->rrs->rr = rr;
			rrsets->type = rr_type;
		} else {
			rrsets->signatures = ldns_dnssec_rrs_new();
			rrsets->signatures->rr = rr;
			rrsets->type = rr_type;
		}
		return LDNS_STATUS_OK;
	}

	if (rr_type > ldns_dnssec_rrsets_type(rrsets)) {
		if (rrsets->next) {
			result = ldns_dnssec_rrsets_add_rr(rrsets->next, rr);
		} else {
			new_rrsets = ldns_dnssec_rrsets_new_frm_rr(rr);
			rrsets->next = new_rrsets;
		}
	} else if (rr_type < ldns_dnssec_rrsets_type(rrsets)) {
		/* move the current one into the new next,
		   replace field of current with data from new rr */
		new_rrsets = ldns_dnssec_rrsets_new();
		new_rrsets->rrs = rrsets->rrs;
		new_rrsets->type = rrsets->type;
		new_rrsets->signatures = rrsets->signatures;
		new_rrsets->next = rrsets->next;
		if (!rrsig) {
			rrsets->rrs = ldns_dnssec_rrs_new();
			rrsets->rrs->rr = rr;
			rrsets->signatures = NULL;
		} else {
			rrsets->rrs = NULL;
			rrsets->signatures = ldns_dnssec_rrs_new();
			rrsets->signatures->rr = rr;
		}
		rrsets->type = rr_type;
		rrsets->next = new_rrsets;
	} else {
		/* equal, add to current rrsets */
		if (rrsig) {
			if (rrsets->signatures) {
				result = ldns_dnssec_rrs_add_rr(rrsets->signatures, rr);
			} else {
				rrsets->signatures = ldns_dnssec_rrs_new();
				rrsets->signatures->rr = rr;
			}
		} else {
			if (rrsets->rrs) {
				result = ldns_dnssec_rrs_add_rr(rrsets->rrs, rr);
			} else {
				rrsets->rrs = ldns_dnssec_rrs_new();
				rrsets->rrs->rr = rr;
			}
		}
	}

	return result;
}

static void
ldns_dnssec_rrsets_print_soa_fmt(FILE *out, const ldns_output_format *fmt,
		const ldns_dnssec_rrsets *rrsets,
		bool follow,
		bool show_soa)
{
	if (!rrsets) {
		if ((fmt->flags & LDNS_COMMENT_LAYOUT))
			fprintf(out, "; <void>\n");
	} else {
		if (rrsets->rrs &&
		    (show_soa ||
			ldns_rr_get_type(rrsets->rrs->rr) != LDNS_RR_TYPE_SOA
		    )
		   ) {
			ldns_dnssec_rrs_print_fmt(out, fmt, rrsets->rrs);
			if (rrsets->signatures) {
				ldns_dnssec_rrs_print_fmt(out, fmt,
						rrsets->signatures);
			}
		}
		if (follow && rrsets->next) {
			ldns_dnssec_rrsets_print_soa_fmt(out, fmt,
					rrsets->next, follow, show_soa);
		}
	}
}


void
ldns_dnssec_rrsets_print_fmt(FILE *out, const ldns_output_format *fmt,
		const ldns_dnssec_rrsets *rrsets,
		bool follow)
{
	ldns_dnssec_rrsets_print_soa_fmt(out, fmt, rrsets, follow, true);
}

void
ldns_dnssec_rrsets_print(FILE *out, const ldns_dnssec_rrsets *rrsets, bool follow)
{
	ldns_dnssec_rrsets_print_fmt(out, ldns_output_format_default,
			rrsets, follow);
}

ldns_dnssec_name *
ldns_dnssec_name_new(void)
{
	ldns_dnssec_name *new_name;

	new_name = LDNS_CALLOC(ldns_dnssec_name, 1);
	if (!new_name) {
		return NULL;
	}
	/*
	 * not needed anymore because CALLOC initalizes everything to zero.

	new_name->name = NULL;
	new_name->rrsets = NULL;
	new_name->name_alloced = false;
	new_name->nsec = NULL;
	new_name->nsec_signatures = NULL;

	new_name->is_glue = false;
	new_name->hashed_name = NULL;

	 */
	return new_name;
}

ldns_dnssec_name *
ldns_dnssec_name_new_frm_rr(ldns_rr *rr)
{
	ldns_dnssec_name *new_name = ldns_dnssec_name_new();

	new_name->name = ldns_rr_owner(rr);
	if(ldns_dnssec_name_add_rr(new_name, rr) != LDNS_STATUS_OK) {
		ldns_dnssec_name_free(new_name);
		return NULL;
	}

	return new_name;
}

INLINE void
ldns_dnssec_name_free_internal(ldns_dnssec_name *name,
                               int deep)
{
	if (name) {
		if (name->name_alloced) {
			ldns_rdf_deep_free(name->name);
		}
		if (name->rrsets) {
			ldns_dnssec_rrsets_free_internal(name->rrsets, deep);
		}
		if (name->nsec && deep) {
			ldns_rr_free(name->nsec);
		}
		if (name->nsec_signatures) {
			ldns_dnssec_rrs_free_internal(name->nsec_signatures, deep);
		}
		if (name->hashed_name) {
			if (deep) {
				ldns_rdf_deep_free(name->hashed_name);
			}
		}
		LDNS_FREE(name);
	}
}

void
ldns_dnssec_name_free(ldns_dnssec_name *name)
{
  ldns_dnssec_name_free_internal(name, 0);
}

void
ldns_dnssec_name_deep_free(ldns_dnssec_name *name)
{
  ldns_dnssec_name_free_internal(name, 1);
}

ldns_rdf *
ldns_dnssec_name_name(const ldns_dnssec_name *name)
{
	if (name) {
		return name->name;
	}
	return NULL;
}

bool
ldns_dnssec_name_is_glue(const ldns_dnssec_name *name)
{
	if (name) {
		return name->is_glue;
	}
	return false;
}

void
ldns_dnssec_name_set_name(ldns_dnssec_name *rrset,
					 ldns_rdf *dname)
{
	if (rrset && dname) {
		rrset->name = dname;
	}
}


void
ldns_dnssec_name_set_nsec(ldns_dnssec_name *rrset, ldns_rr *nsec)
{
	if (rrset && nsec) {
		rrset->nsec = nsec;
	}
}

int
ldns_dnssec_name_cmp(const void *a, const void *b)
{
	ldns_dnssec_name *na = (ldns_dnssec_name *) a;
	ldns_dnssec_name *nb = (ldns_dnssec_name *) b;

	if (na && nb) {
		return ldns_dname_compare(ldns_dnssec_name_name(na),
							 ldns_dnssec_name_name(nb));
	} else if (na) {
		return 1;
	} else if (nb) {
		return -1;
	} else {
		return 0;
	}
}

ldns_status
ldns_dnssec_name_add_rr(ldns_dnssec_name *name,
				    ldns_rr *rr)
{
	ldns_status result = LDNS_STATUS_OK;
	ldns_rr_type rr_type;
	ldns_rr_type typecovered = 0;

	/* special handling for NSEC3 and NSECX covering RRSIGS */

	if (!name || !rr) {
		return LDNS_STATUS_ERR;
	}

	rr_type = ldns_rr_get_type(rr);

	if (rr_type == LDNS_RR_TYPE_RRSIG) {
		typecovered = ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(rr));
	}

	if (rr_type == LDNS_RR_TYPE_NSEC ||
	    rr_type == LDNS_RR_TYPE_NSEC3) {
		/* XX check if is already set (and error?) */
		name->nsec = rr;
	} else if (typecovered == LDNS_RR_TYPE_NSEC ||
			 typecovered == LDNS_RR_TYPE_NSEC3) {
		if (name->nsec_signatures) {
			result = ldns_dnssec_rrs_add_rr(name->nsec_signatures, rr);
		} else {
			name->nsec_signatures = ldns_dnssec_rrs_new();
			name->nsec_signatures->rr = rr;
		}
	} else {
		/* it's a 'normal' RR, add it to the right rrset */
		if (name->rrsets) {
			result = ldns_dnssec_rrsets_add_rr(name->rrsets, rr);
		} else {
			name->rrsets = ldns_dnssec_rrsets_new();
			result = ldns_dnssec_rrsets_add_rr(name->rrsets, rr);
		}
	}
	return result;
}

ldns_dnssec_rrsets *
ldns_dnssec_name_find_rrset(const ldns_dnssec_name *name,
					   ldns_rr_type type) {
	ldns_dnssec_rrsets *result;

	result = name->rrsets;
	while (result) {
		if (result->type == type) {
			return result;
		} else {
			result = result->next;
		}
	}
	return NULL;
}

ldns_dnssec_rrsets *
ldns_dnssec_zone_find_rrset(const ldns_dnssec_zone *zone,
					   const ldns_rdf *dname,
					   ldns_rr_type type)
{
	ldns_rbnode_t *node;

	if (!zone || !dname || !zone->names) {
		return NULL;
	}

	node = ldns_rbtree_search(zone->names, dname);
	if (node) {
		return ldns_dnssec_name_find_rrset((ldns_dnssec_name *)node->data,
									type);
	} else {
		return NULL;
	}
}

static void
ldns_dnssec_name_print_soa_fmt(FILE *out, const ldns_output_format *fmt,
		const ldns_dnssec_name *name,
		bool show_soa)
{
	if (name) {
		if(name->rrsets) {
			ldns_dnssec_rrsets_print_soa_fmt(out, fmt,
					name->rrsets, true, show_soa);
		} else if ((fmt->flags & LDNS_COMMENT_LAYOUT)) {
			fprintf(out, ";; Empty nonterminal: ");
			ldns_rdf_print(out, name->name);
			fprintf(out, "\n");
		}
		if(name->nsec) {
			ldns_rr_print_fmt(out, fmt, name->nsec);
		}
		if (name->nsec_signatures) {
			ldns_dnssec_rrs_print_fmt(out, fmt,
					name->nsec_signatures);
		}
	} else if ((fmt->flags & LDNS_COMMENT_LAYOUT)) {
		fprintf(out, "; <void>\n");
	}
}


void
ldns_dnssec_name_print_fmt(FILE *out, const ldns_output_format *fmt,
		const ldns_dnssec_name *name)
{
	ldns_dnssec_name_print_soa_fmt(out, fmt, name, true);
}

void
ldns_dnssec_name_print(FILE *out, const ldns_dnssec_name *name)
{
	ldns_dnssec_name_print_fmt(out, ldns_output_format_default, name);
}


ldns_dnssec_zone *
ldns_dnssec_zone_new(void)
{
	ldns_dnssec_zone *zone = LDNS_MALLOC(ldns_dnssec_zone);
        if(!zone) return NULL;
	zone->soa = NULL;
	zone->names = NULL;
	zone->hashed_names = NULL;
	zone->_nsec3params = NULL;

	return zone;
}

static bool
rr_is_rrsig_covering(ldns_rr* rr, ldns_rr_type t)
{
	return     ldns_rr_get_type(rr) == LDNS_RR_TYPE_RRSIG
		&& ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(rr)) == t;
}

/* When the zone is first read into an list and then inserted into an
 * ldns_dnssec_zone (rbtree) the nodes of the rbtree are allocated close (next)
 * to each other. Because ldns-verify-zone (the only program that uses this
 * function) uses the rbtree mostly for sequentual walking, this results
 * in a speed increase (of 15% on linux) because we have less CPU-cache misses.
 */
#define FASTER_DNSSEC_ZONE_NEW_FRM_FP 1 /* Because of L2 cache efficiency */

static ldns_status
ldns_dnssec_zone_add_empty_nonterminals_nsec3(
		ldns_dnssec_zone *zone, ldns_rbtree_t *nsec3s);

static void
ldns_todo_nsec3_ents_node_free(ldns_rbnode_t *node, void *arg) {
	(void) arg;
	ldns_rdf_deep_free((ldns_rdf *)node->key);
	LDNS_FREE(node);
}

ldns_status
ldns_dnssec_zone_new_frm_fp_l(ldns_dnssec_zone** z, FILE* fp, const ldns_rdf* origin,
	       	uint32_t ttl, ldns_rr_class ATTR_UNUSED(c), int* line_nr)
{
	ldns_rr* cur_rr;
	size_t i;

	ldns_rdf *my_origin = NULL;
	ldns_rdf *my_prev = NULL;

	ldns_dnssec_zone *newzone = ldns_dnssec_zone_new();
	/* NSEC3s may occur before the names they refer to. We must remember
	   them and add them to the name later on, after the name is read.
	   We track not yet  matching NSEC3s*n the todo_nsec3s list */
	ldns_rr_list* todo_nsec3s = ldns_rr_list_new();
	/* when reading NSEC3s, there is a chance that we encounter nsecs
	   for empty nonterminals, whose nonterminals we cannot derive yet
	   because the needed information is to be read later.

	   nsec3_ents (where ent is e.n.t.; i.e. empty non terminal) will
	   hold the NSEC3s that still didn't have a matching name in the
	   zone tree, even after all names were read.  They can only match
	   after the zone is equiped with all the empty non terminals. */
	ldns_rbtree_t todo_nsec3_ents;
	ldns_rbnode_t *new_node;
	ldns_rr_list* todo_nsec3_rrsigs = ldns_rr_list_new();

	ldns_status status;

#ifdef FASTER_DNSSEC_ZONE_NEW_FRM_FP
	ldns_zone* zone = NULL;
#else
	uint32_t  my_ttl = ttl;
#endif

	ldns_rbtree_init(&todo_nsec3_ents, ldns_dname_compare_v);

#ifdef FASTER_DNSSEC_ZONE_NEW_FRM_FP
	status = ldns_zone_new_frm_fp_l(&zone, fp, origin,ttl, c, line_nr);
	if (status != LDNS_STATUS_OK)
		goto error;
#endif
	if (!newzone || !todo_nsec3s || !todo_nsec3_rrsigs ) {
		status = LDNS_STATUS_MEM_ERR;
		goto error;
	}
	if (origin) {
		if (!(my_origin = ldns_rdf_clone(origin))) {
			status = LDNS_STATUS_MEM_ERR;
			goto error;
		}
		if (!(my_prev   = ldns_rdf_clone(origin))) {
			status = LDNS_STATUS_MEM_ERR;
			goto error;
		}
	}

#ifdef FASTER_DNSSEC_ZONE_NEW_FRM_FP
	if (ldns_zone_soa(zone)) {
		status = ldns_dnssec_zone_add_rr(newzone, ldns_zone_soa(zone));
		if (status != LDNS_STATUS_OK)
			goto error;
	}
	for (i = 0; i < ldns_rr_list_rr_count(ldns_zone_rrs(zone)); i++) {
		cur_rr = ldns_rr_list_rr(ldns_zone_rrs(zone), i);
		status = LDNS_STATUS_OK;
#else
	while (!feof(fp)) {
		status = ldns_rr_new_frm_fp_l(&cur_rr, fp, &my_ttl, &my_origin,
				&my_prev, line_nr);

#endif
		switch (status) {
		case LDNS_STATUS_OK:

			status = ldns_dnssec_zone_add_rr(newzone, cur_rr);
			if (status ==
				LDNS_STATUS_DNSSEC_NSEC3_ORIGINAL_NOT_FOUND) {

				if (rr_is_rrsig_covering(cur_rr,
							LDNS_RR_TYPE_NSEC3)){
					ldns_rr_list_push_rr(todo_nsec3_rrsigs,
							cur_rr);
				} else {
					ldns_rr_list_push_rr(todo_nsec3s,
						       	cur_rr);
				}
				status = LDNS_STATUS_OK;

			} else if (status != LDNS_STATUS_OK)
				goto error;

			break;


		case LDNS_STATUS_SYNTAX_EMPTY:	/* empty line was seen */
		case LDNS_STATUS_SYNTAX_TTL:	/* the ttl was set*/
		case LDNS_STATUS_SYNTAX_ORIGIN:	/* the origin was set*/
			status = LDNS_STATUS_OK;
			break;

		case LDNS_STATUS_SYNTAX_INCLUDE:/* $include not implemented */
			status =  LDNS_STATUS_SYNTAX_INCLUDE_ERR_NOTIMPL;
			break;

		default:
			goto error;
		}
	}

	for (i = 0; status == LDNS_STATUS_OK &&
			i < ldns_rr_list_rr_count(todo_nsec3s); i++) {
		cur_rr = ldns_rr_list_rr(todo_nsec3s, i);
		status = ldns_dnssec_zone_add_rr(newzone, cur_rr);
		if (status == LDNS_STATUS_DNSSEC_NSEC3_ORIGINAL_NOT_FOUND) {
			if (!(new_node = LDNS_MALLOC(ldns_rbnode_t))) {
				status = LDNS_STATUS_MEM_ERR;
				break;
			}
			new_node->key  = ldns_dname_label(ldns_rr_owner(cur_rr), 0);
			new_node->data = cur_rr;
			if (!ldns_rbtree_insert(&todo_nsec3_ents, new_node)) {
				LDNS_FREE(new_node);
				status = LDNS_STATUS_MEM_ERR;
				break;
			}
			status = LDNS_STATUS_OK;
		}
	}
	if (todo_nsec3_ents.count > 0)
		(void) ldns_dnssec_zone_add_empty_nonterminals_nsec3(
				newzone, &todo_nsec3_ents);
	for (i = 0; status == LDNS_STATUS_OK &&
			i < ldns_rr_list_rr_count(todo_nsec3_rrsigs); i++) {
		cur_rr = ldns_rr_list_rr(todo_nsec3_rrsigs, i);
		status = ldns_dnssec_zone_add_rr(newzone, cur_rr);
	}
	if (z) {
		*z = newzone;
		newzone = NULL;
	} else {
		ldns_dnssec_zone_free(newzone);
	}

error:
#ifdef FASTER_DNSSEC_ZONE_NEW_FRM_FP
	if (zone) {
		ldns_zone_free(zone);
	}
#endif
	ldns_rr_list_free(todo_nsec3_rrsigs);
	ldns_traverse_postorder(&todo_nsec3_ents,
			ldns_todo_nsec3_ents_node_free, NULL);
	ldns_rr_list_free(todo_nsec3s);

	if (my_origin) {
		ldns_rdf_deep_free(my_origin);
	}
	if (my_prev) {
		ldns_rdf_deep_free(my_prev);
	}
	if (newzone) {
		ldns_dnssec_zone_free(newzone);
	}
	return status;
}

ldns_status
ldns_dnssec_zone_new_frm_fp(ldns_dnssec_zone** z, FILE* fp, const ldns_rdf* origin,
		uint32_t ttl, ldns_rr_class ATTR_UNUSED(c))
{
	return ldns_dnssec_zone_new_frm_fp_l(z, fp, origin, ttl, c, NULL);
}

static void
ldns_dnssec_name_node_free(ldns_rbnode_t *node, void *arg) {
	(void) arg;
	ldns_dnssec_name_free((ldns_dnssec_name *)node->data);
	LDNS_FREE(node);
}

static void
ldns_dnssec_name_node_deep_free(ldns_rbnode_t *node, void *arg) {
	(void) arg;
	ldns_dnssec_name_deep_free((ldns_dnssec_name *)node->data);
	LDNS_FREE(node);
}

void
ldns_dnssec_zone_free(ldns_dnssec_zone *zone)
{
	if (zone) {
		if (zone->names) {
			/* destroy all name structures within the tree */
			ldns_traverse_postorder(zone->names,
						    ldns_dnssec_name_node_free,
						    NULL);
			LDNS_FREE(zone->names);
		}
		LDNS_FREE(zone);
	}
}

void
ldns_dnssec_zone_deep_free(ldns_dnssec_zone *zone)
{
	if (zone) {
		if (zone->names) {
			/* destroy all name structures within the tree */
			ldns_traverse_postorder(zone->names,
						    ldns_dnssec_name_node_deep_free,
						    NULL);
			LDNS_FREE(zone->names);
		}
		LDNS_FREE(zone);
	}
}

/* use for dname comparison in tree */
int
ldns_dname_compare_v(const void *a, const void *b) {
	return ldns_dname_compare((ldns_rdf *)a, (ldns_rdf *)b);
}

static void
ldns_dnssec_name_make_hashed_name(ldns_dnssec_zone *zone,
		ldns_dnssec_name* name, ldns_rr* nsec3rr);

static void
ldns_hashed_names_node_free(ldns_rbnode_t *node, void *arg) {
	(void) arg;
	LDNS_FREE(node);
}

static void
ldns_dnssec_zone_hashed_names_from_nsec3(
		ldns_dnssec_zone* zone, ldns_rr* nsec3rr)
{
	ldns_rbnode_t* current_node;
	ldns_dnssec_name* current_name;

	assert(zone != NULL);
	assert(nsec3rr != NULL);

	if (zone->hashed_names) {
		ldns_traverse_postorder(zone->hashed_names,
				ldns_hashed_names_node_free, NULL);
		LDNS_FREE(zone->hashed_names);
	}
	zone->_nsec3params = nsec3rr;

	/* So this is a NSEC3 zone.
	* Calculate hashes for all names already in the zone
	*/
	zone->hashed_names = ldns_rbtree_create(ldns_dname_compare_v);
	if (zone->hashed_names == NULL) {
		return;
	}
	for ( current_node  = ldns_rbtree_first(zone->names)
	    ; current_node != LDNS_RBTREE_NULL
	    ; current_node  = ldns_rbtree_next(current_node)
	    ) {
		current_name = (ldns_dnssec_name *) current_node->data;
		ldns_dnssec_name_make_hashed_name(zone, current_name, nsec3rr);

	}
}

static void
ldns_dnssec_name_make_hashed_name(ldns_dnssec_zone *zone,
		ldns_dnssec_name* name, ldns_rr* nsec3rr)
{
	ldns_rbnode_t* new_node;

	assert(name != NULL);
	if (! zone->_nsec3params) {
		if (! nsec3rr) {
			return;
		}
		ldns_dnssec_zone_hashed_names_from_nsec3(zone, nsec3rr);

	} else if (! nsec3rr) {
		nsec3rr = zone->_nsec3params;
	}
	name->hashed_name = ldns_nsec3_hash_name_frm_nsec3(nsec3rr, name->name);

	/* Also store in zone->hashed_names */
	if ((new_node = LDNS_MALLOC(ldns_rbnode_t))) {

		new_node->key  = name->hashed_name;
		new_node->data = name;

		if (ldns_rbtree_insert(zone->hashed_names, new_node) == NULL) {

				LDNS_FREE(new_node);
		}
	}
}


static ldns_rbnode_t *
ldns_dnssec_zone_find_nsec3_original(ldns_dnssec_zone *zone, ldns_rr *rr) {
	ldns_rdf *hashed_name;

	hashed_name = ldns_dname_label(ldns_rr_owner(rr), 0);
	if (hashed_name == NULL) {
		return NULL;
	}
	if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_NSEC3 && ! zone->_nsec3params){

		ldns_dnssec_zone_hashed_names_from_nsec3(zone, rr);
	}
	if (zone->hashed_names == NULL) {
		ldns_rdf_deep_free(hashed_name);
		return NULL;
	}
	return  ldns_rbtree_search(zone->hashed_names, hashed_name);
}

ldns_status
ldns_dnssec_zone_add_rr(ldns_dnssec_zone *zone, ldns_rr *rr)
{
	ldns_status result = LDNS_STATUS_OK;
	ldns_dnssec_name *cur_name;
	ldns_rbnode_t *cur_node;
	ldns_rr_type type_covered = 0;

	if (!zone || !rr) {
		return LDNS_STATUS_ERR;
	}

	if (!zone->names) {
		zone->names = ldns_rbtree_create(ldns_dname_compare_v);
                if(!zone->names) return LDNS_STATUS_MEM_ERR;
	}

	/* we need the original of the hashed name if this is
	   an NSEC3, or an RRSIG that covers an NSEC3 */
	if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_RRSIG) {
		type_covered = ldns_rdf2rr_type(ldns_rr_rrsig_typecovered(rr));
	}
	if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_NSEC3 ||
	    type_covered == LDNS_RR_TYPE_NSEC3) {
		cur_node = ldns_dnssec_zone_find_nsec3_original(zone, rr);
		if (!cur_node) {
			return LDNS_STATUS_DNSSEC_NSEC3_ORIGINAL_NOT_FOUND;
		}
	} else {
		cur_node = ldns_rbtree_search(zone->names, ldns_rr_owner(rr));
	}
	if (!cur_node) {
		/* add */
		cur_name = ldns_dnssec_name_new_frm_rr(rr);
                if(!cur_name) return LDNS_STATUS_MEM_ERR;
		cur_node = LDNS_MALLOC(ldns_rbnode_t);
                if(!cur_node) {
                        ldns_dnssec_name_free(cur_name);
                        return LDNS_STATUS_MEM_ERR;
                }
		cur_node->key = ldns_rr_owner(rr);
		cur_node->data = cur_name;
		(void)ldns_rbtree_insert(zone->names, cur_node);
		ldns_dnssec_name_make_hashed_name(zone, cur_name, NULL);
	} else {
		cur_name = (ldns_dnssec_name *) cur_node->data;
		result = ldns_dnssec_name_add_rr(cur_name, rr);
	}
	if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_SOA) {
		zone->soa = cur_name;
	}
	return result;
}

void
ldns_dnssec_zone_names_print_fmt(FILE *out, const ldns_output_format *fmt,
		const ldns_rbtree_t *tree,
		bool print_soa)
{
	ldns_rbnode_t *node;
	ldns_dnssec_name *name;

	node = ldns_rbtree_first(tree);
	while (node != LDNS_RBTREE_NULL) {
		name = (ldns_dnssec_name *) node->data;
		ldns_dnssec_name_print_soa_fmt(out, fmt, name, print_soa);
		if ((fmt->flags & LDNS_COMMENT_LAYOUT))
			fprintf(out, ";\n");
		node = ldns_rbtree_next(node);
	}
}

void
ldns_dnssec_zone_names_print(FILE *out, const ldns_rbtree_t *tree, bool print_soa)
{
	ldns_dnssec_zone_names_print_fmt(out, ldns_output_format_default,
		       tree, print_soa);
}

void
ldns_dnssec_zone_print_fmt(FILE *out, const ldns_output_format *fmt,
	       const ldns_dnssec_zone *zone)
{
	if (zone) {
		if (zone->soa) {
			if ((fmt->flags & LDNS_COMMENT_LAYOUT)) {
				fprintf(out, ";; Zone: ");
				ldns_rdf_print(out, ldns_dnssec_name_name(
							zone->soa));
				fprintf(out, "\n;\n");
			}
			ldns_dnssec_rrsets_print_fmt(out, fmt,
					ldns_dnssec_name_find_rrset(
						zone->soa,
						LDNS_RR_TYPE_SOA),
					false);
			if ((fmt->flags & LDNS_COMMENT_LAYOUT))
				fprintf(out, ";\n");
		}

		if (zone->names) {
			ldns_dnssec_zone_names_print_fmt(out, fmt,
					zone->names, false);
		}
	}
}

void
ldns_dnssec_zone_print(FILE *out, const ldns_dnssec_zone *zone)
{
	ldns_dnssec_zone_print_fmt(out, ldns_output_format_default, zone);
}

static ldns_status
ldns_dnssec_zone_add_empty_nonterminals_nsec3(
		ldns_dnssec_zone *zone, ldns_rbtree_t *nsec3s)
{
	ldns_dnssec_name *new_name;
	ldns_rdf *cur_name;
	ldns_rdf *next_name;
	ldns_rbnode_t *cur_node, *next_node, *new_node;

	/* for the detection */
	uint16_t i, cur_label_count, next_label_count;
	uint16_t soa_label_count = 0;
	ldns_rdf *l1, *l2;
	int lpos;

	if (!zone) {
		return LDNS_STATUS_ERR;
	}
	if (zone->soa && zone->soa->name) {
		soa_label_count = ldns_dname_label_count(zone->soa->name);
	}

	cur_node = ldns_rbtree_first(zone->names);
	while (cur_node != LDNS_RBTREE_NULL) {
		next_node = ldns_rbtree_next(cur_node);

		/* skip glue */
		while (next_node != LDNS_RBTREE_NULL &&
		       next_node->data &&
		       ((ldns_dnssec_name *)next_node->data)->is_glue
		) {
			next_node = ldns_rbtree_next(next_node);
		}

		if (next_node == LDNS_RBTREE_NULL) {
			next_node = ldns_rbtree_first(zone->names);
		}
		if (! cur_node->data || ! next_node->data) {
			return LDNS_STATUS_ERR;
		}
		cur_name = ((ldns_dnssec_name *)cur_node->data)->name;
		next_name = ((ldns_dnssec_name *)next_node->data)->name;
		cur_label_count = ldns_dname_label_count(cur_name);
		next_label_count = ldns_dname_label_count(next_name);

		/* Since the names are in canonical order, we can
		 * recognize empty non-terminals by their labels;
		 * every label after the first one on the next owner
		 * name is a non-terminal if it either does not exist
		 * in the current name or is different from the same
		 * label in the current name (counting from the end)
		 */
		for (i = 1; i < next_label_count - soa_label_count; i++) {
			lpos = (int)cur_label_count - (int)next_label_count + (int)i;
			if (lpos >= 0) {
				l1 = ldns_dname_clone_from(cur_name, (uint8_t)lpos);
			} else {
				l1 = NULL;
			}
			l2 = ldns_dname_clone_from(next_name, i);

			if (!l1 || ldns_dname_compare(l1, l2) != 0) {
				/* We have an empty nonterminal, add it to the
				 * tree
				 */
				ldns_rbnode_t *node = NULL;
				ldns_rdf *ent_name;

				if (!(ent_name = ldns_dname_clone_from(
						next_name, i)))
					return LDNS_STATUS_MEM_ERR;

				if (nsec3s && zone->_nsec3params) {
					ldns_rdf *ent_hashed_name;

					if (!(ent_hashed_name =
					    ldns_nsec3_hash_name_frm_nsec3(
							zone->_nsec3params,
							ent_name)))
						return LDNS_STATUS_MEM_ERR;
					node = ldns_rbtree_search(nsec3s,
							ent_hashed_name);
					if (!node) {
						ldns_rdf_deep_free(l1);
						ldns_rdf_deep_free(l2);
						continue;
					}
				}
				new_name = ldns_dnssec_name_new();
				if (!new_name) {
					return LDNS_STATUS_MEM_ERR;
				}
				new_name->name = ent_name;
				if (!new_name->name) {
					ldns_dnssec_name_free(new_name);
					return LDNS_STATUS_MEM_ERR;
				}
				new_name->name_alloced = true;
				new_node = LDNS_MALLOC(ldns_rbnode_t);
				if (!new_node) {
					ldns_dnssec_name_free(new_name);
					return LDNS_STATUS_MEM_ERR;
				}
				new_node->key = new_name->name;
				new_node->data = new_name;
				(void)ldns_rbtree_insert(zone->names, new_node);
				ldns_dnssec_name_make_hashed_name(
						zone, new_name, NULL);
				if (node)
					(void) ldns_dnssec_zone_add_rr(zone,
							(ldns_rr *)node->data);
			}
			ldns_rdf_deep_free(l1);
			ldns_rdf_deep_free(l2);
		}

		/* we might have inserted a new node after
		 * the current one so we can't just use next()
		 */
		if (next_node != ldns_rbtree_first(zone->names)) {
			cur_node = next_node;
		} else {
			cur_node = LDNS_RBTREE_NULL;
		}
	}
	return LDNS_STATUS_OK;
}

ldns_status
ldns_dnssec_zone_add_empty_nonterminals(ldns_dnssec_zone *zone)
{
	return ldns_dnssec_zone_add_empty_nonterminals_nsec3(zone, NULL);
}

bool
ldns_dnssec_zone_is_nsec3_optout(const ldns_dnssec_zone* zone)
{
	ldns_rr* nsec3;
	ldns_rbnode_t* node;

	if (ldns_dnssec_name_find_rrset(zone->soa, LDNS_RR_TYPE_NSEC3PARAM)) {
		node = ldns_rbtree_first(zone->names);
		while (node != LDNS_RBTREE_NULL) {
			nsec3 = ((ldns_dnssec_name*)node->data)->nsec;
			if (nsec3 &&ldns_rr_get_type(nsec3)
					== LDNS_RR_TYPE_NSEC3 &&
					ldns_nsec3_optout(nsec3)) {
				return true;
			}
			node = ldns_rbtree_next(node);
		}
	}
	return false;
}