C++ dns_name_fromregion函数代码示例

static inline isc_result_t totext_md (ARGS_TOTEXT)
{
    isc_region_t region;

    dns_name_t name;

    dns_name_t prefix;

    isc_boolean_t sub;

    REQUIRE (rdata->type == 3);
    REQUIRE (rdata->length != 0);

    dns_name_init (&name, NULL);
    dns_name_init (&prefix, NULL);

    dns_rdata_toregion (rdata, &region);
    dns_name_fromregion (&name, &region);

    sub = name_prefix (&name, tctx->origin, &prefix);

    return (dns_name_totext (&prefix, sub, target));
}

static inline isc_result_t
tostruct_in_nsap_ptr(ARGS_TOSTRUCT) {
	isc_region_t region;
	dns_rdata_in_nsap_ptr_t *nsap_ptr = target;
	dns_name_t name;

	REQUIRE(rdata->type == 23);
	REQUIRE(rdata->rdclass == 1);
	REQUIRE(target != NULL);
	REQUIRE(rdata->length != 0);

	nsap_ptr->common.rdclass = rdata->rdclass;
	nsap_ptr->common.rdtype = rdata->type;
	ISC_LINK_INIT(&nsap_ptr->common, link);

	dns_name_init(&name, NULL);
	dns_rdata_toregion(rdata, &region);
	dns_name_fromregion(&name, &region);
	dns_name_init(&nsap_ptr->owner, NULL);
	RETERR(name_duporclone(&name, mctx, &nsap_ptr->owner));
	nsap_ptr->mctx = mctx;
	return (ISC_R_SUCCESS);
}

static inline isc_result_t tostruct_md (ARGS_TOSTRUCT)
{
    dns_rdata_md_t *md = target;

    isc_region_t r;

    dns_name_t name;

    REQUIRE (rdata->type == 3);
    REQUIRE (target != NULL);
    REQUIRE (rdata->length != 0);

    md->common.rdclass = rdata->rdclass;
    md->common.rdtype = rdata->type;
    ISC_LINK_INIT (&md->common, link);

    dns_name_init (&name, NULL);
    dns_rdata_toregion (rdata, &r);
    dns_name_fromregion (&name, &r);
    dns_name_init (&md->md, NULL);
    RETERR (name_duporclone (&name, mctx, &md->md));
    md->mctx = mctx;
    return (ISC_R_SUCCESS);
}

static inline isc_result_t
tostruct_lp(ARGS_TOSTRUCT) {
	isc_region_t region;
	dns_rdata_lp_t *lp = target;
	dns_name_t name;

	REQUIRE(rdata->type == dns_rdatatype_lp);
	REQUIRE(target != NULL);
	REQUIRE(rdata->length != 0);

	lp->common.rdclass = rdata->rdclass;
	lp->common.rdtype = rdata->type;
	ISC_LINK_INIT(&lp->common, link);

	dns_name_init(&name, NULL);
	dns_rdata_toregion(rdata, &region);
	lp->pref = uint16_fromregion(&region);
	isc_region_consume(&region, 2);
	dns_name_fromregion(&name, &region);
	dns_name_init(&lp->lp, NULL);
	RETERR(name_duporclone(&name, mctx, &lp->lp));
	lp->mctx = mctx;
	return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_rt(ARGS_TOWIRE) {
	dns_name_t name;
	dns_offsets_t offsets;
	isc_region_t region;
	isc_region_t tr;

	REQUIRE(rdata->type == 21);
	REQUIRE(rdata->length != 0);

	dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
	isc_buffer_availableregion(target, &tr);
	dns_rdata_toregion(rdata, &region);
	if (tr.length < 2)
		return (ISC_R_NOSPACE);
	memmove(tr.base, region.base, 2);
	isc_region_consume(&region, 2);
	isc_buffer_add(target, 2);

	dns_name_init(&name, offsets);
	dns_name_fromregion(&name, &region);

	return (dns_name_towire(&name, cctx, target));
}

static inline isc_result_t
totext_afsdb(ARGS_TOTEXT) {
	dns_name_t name;
	dns_name_t prefix;
	isc_region_t region;
	char buf[sizeof("64000 ")];
	isc_boolean_t sub;
	unsigned int num;

	REQUIRE(rdata->type == 18);
	REQUIRE(rdata->length != 0);

	dns_name_init(&name, NULL);
	dns_name_init(&prefix, NULL);

	dns_rdata_toregion(rdata, &region);
	num = uint16_fromregion(&region);
	isc_region_consume(&region, 2);
	sprintf(buf, "%u ", num);
	RETERR(str_totext(buf, target));
	dns_name_fromregion(&name, &region);
	sub = name_prefix(&name, tctx->origin, &prefix);
	return (dns_name_totext(&prefix, sub, target));
}

static inline isc_result_t
towire_sig(ARGS_TOWIRE) {
	isc_region_t sr;
	dns_name_t name;
	dns_offsets_t offsets;

	REQUIRE(rdata->type == dns_rdatatype_sig);
	REQUIRE(rdata->length != 0);

	dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
	dns_rdata_toregion(rdata, &sr);
	/*
	 * type covered: 2
	 * algorithm: 1
	 * labels: 1
	 * original ttl: 4
	 * signature expiration: 4
	 * time signed: 4
	 * key footprint: 2
	 */
	RETERR(mem_tobuffer(target, sr.base, 18));
	isc_region_consume(&sr, 18);

	/*
	 * Signer.
	 */
	dns_name_init(&name, offsets);
	dns_name_fromregion(&name, &sr);
	isc_region_consume(&sr, name_length(&name));
	RETERR(dns_name_towire(&name, cctx, target));

	/*
	 * Signature.
	 */
	return (mem_tobuffer(target, sr.base, sr.length));
}

static inline isc_boolean_t
checknames_ptr(ARGS_CHECKNAMES) {
	isc_region_t region;
	dns_name_t name;

	REQUIRE(rdata->type == 12);

	if (rdata->rdclass != dns_rdataclass_in)
	    return (ISC_TRUE);

	if (dns_name_issubdomain(owner, &in_addr_arpa) ||
	    dns_name_issubdomain(owner, &ip6_arpa) ||
	    dns_name_issubdomain(owner, &ip6_int)) {
		dns_rdata_toregion(rdata, &region);
		dns_name_init(&name, NULL);
		dns_name_fromregion(&name, &region);
		if (!dns_name_ishostname(&name, ISC_FALSE)) {
			if (bad != NULL)
				dns_name_clone(&name, bad);
			return (ISC_FALSE);
		}
	}
	return (ISC_TRUE);
}

static inline isc_result_t
towire_in_srv(ARGS_TOWIRE) {
	dns_name_t name;
	dns_offsets_t offsets;
	isc_region_t sr;

	REQUIRE(rdata->type == 33);
	REQUIRE(rdata->length != 0);

	dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
	/*
	 * Priority, weight, port.
	 */
	dns_rdata_toregion(rdata, &sr);
	RETERR(mem_tobuffer(target, sr.base, 6));
	isc_region_consume(&sr, 6);

	/*
	 * Target.
	 */
	dns_name_init(&name, offsets);
	dns_name_fromregion(&name, &sr);
	return (dns_name_towire(&name, cctx, target));
}

static inline isc_result_t
totext_tkey(ARGS_TOTEXT) {
	isc_region_t sr, dr;
	char buf[sizeof("4294967295 ")];
	unsigned long n;
	dns_name_t name;
	dns_name_t prefix;
	isc_boolean_t sub;

	REQUIRE(rdata->type == 249);
	REQUIRE(rdata->length != 0);

	dns_rdata_toregion(rdata, &sr);

	/*
	 * Algorithm.
	 */
	dns_name_init(&name, NULL);
	dns_name_init(&prefix, NULL);
	dns_name_fromregion(&name, &sr);
	sub = name_prefix(&name, tctx->origin, &prefix);
	RETERR(dns_name_totext(&prefix, sub, target));
	RETERR(str_totext(" ", target));
	isc_region_consume(&sr, name_length(&name));

	/*
	 * Inception.
	 */
	n = uint32_fromregion(&sr);
	isc_region_consume(&sr, 4);
	sprintf(buf, "%lu ", n);
	RETERR(str_totext(buf, target));

	/*
	 * Expiration.
	 */
	n = uint32_fromregion(&sr);
	isc_region_consume(&sr, 4);
	sprintf(buf, "%lu ", n);
	RETERR(str_totext(buf, target));

	/*
	 * Mode.
	 */
	n = uint16_fromregion(&sr);
	isc_region_consume(&sr, 2);
	sprintf(buf, "%lu ", n);
	RETERR(str_totext(buf, target));

	/*
	 * Error.
	 */
	n = uint16_fromregion(&sr);
	isc_region_consume(&sr, 2);
	if (dns_tsigrcode_totext((dns_rcode_t)n, target) == ISC_R_SUCCESS)
		RETERR(str_totext(" ", target));
	else {
		sprintf(buf, "%lu ", n);
		RETERR(str_totext(buf, target));
	}

	/*
	 * Key Size.
	 */
	n = uint16_fromregion(&sr);
	isc_region_consume(&sr, 2);
	sprintf(buf, "%lu", n);
	RETERR(str_totext(buf, target));

	/*
	 * Key Data.
	 */
	REQUIRE(n <= sr.length);
	dr = sr;
	dr.length = n;
	if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
		RETERR(str_totext(" (", target));
	RETERR(str_totext(tctx->linebreak, target));
	RETERR(isc_base64_totext(&dr, tctx->width - 2,
				 tctx->linebreak, target));
	if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
		RETERR(str_totext(" ) ", target));
	else
		RETERR(str_totext(" ", target));
	isc_region_consume(&sr, n);

	/*
	 * Other Size.
	 */
	n = uint16_fromregion(&sr);
	isc_region_consume(&sr, 2);
	sprintf(buf, "%lu", n);
	RETERR(str_totext(buf, target));

	/*
	 * Other Data.
	 */
	REQUIRE(n <= sr.length);
	if (n != 0U) {
	    dr = sr;
//.........这里部分代码省略.........

static inline isc_result_t
tostruct_sig(ARGS_TOSTRUCT) {
	isc_region_t sr;
	dns_rdata_sig_t *sig = target;
	dns_name_t signer;

	REQUIRE(rdata->type == dns_rdatatype_sig);
	REQUIRE(target != NULL);
	REQUIRE(rdata->length != 0);

	sig->common.rdclass = rdata->rdclass;
	sig->common.rdtype = rdata->type;
	ISC_LINK_INIT(&sig->common, link);

	dns_rdata_toregion(rdata, &sr);

	/*
	 * Type covered.
	 */
	sig->covered = uint16_fromregion(&sr);
	isc_region_consume(&sr, 2);

	/*
	 * Algorithm.
	 */
	sig->algorithm = uint8_fromregion(&sr);
	isc_region_consume(&sr, 1);

	/*
	 * Labels.
	 */
	sig->labels = uint8_fromregion(&sr);
	isc_region_consume(&sr, 1);

	/*
	 * Original TTL.
	 */
	sig->originalttl = uint32_fromregion(&sr);
	isc_region_consume(&sr, 4);

	/*
	 * Expire time.
	 */
	sig->timeexpire = uint32_fromregion(&sr);
	isc_region_consume(&sr, 4);

	/*
	 * Time signed.
	 */
	sig->timesigned = uint32_fromregion(&sr);
	isc_region_consume(&sr, 4);

	/*
	 * Key ID.
	 */
	sig->keyid = uint16_fromregion(&sr);
	isc_region_consume(&sr, 2);

	dns_name_init(&signer, NULL);
	dns_name_fromregion(&signer, &sr);
	dns_name_init(&sig->signer, NULL);
	RETERR(name_duporclone(&signer, mctx, &sig->signer));
	isc_region_consume(&sr, name_length(&sig->signer));

	/*
	 * Signature.
	 */
	sig->siglen = sr.length;
	sig->signature = mem_maybedup(mctx, sr.base, sig->siglen);
	if (sig->signature == NULL)
		goto cleanup;


	sig->mctx = mctx;
	return (ISC_R_SUCCESS);

 cleanup:
	if (mctx != NULL)
		dns_name_free(&sig->signer, mctx);
	return (ISC_R_NOMEMORY);
}

static inline isc_result_t
totext_sig(ARGS_TOTEXT) {
	isc_region_t sr;
	char buf[sizeof("4294967295")];
	dns_rdatatype_t covered;
	unsigned long ttl;
	unsigned long when;
	unsigned long exp;
	unsigned long foot;
	dns_name_t name;
	dns_name_t prefix;
	isc_boolean_t sub;

	REQUIRE(rdata->type == dns_rdatatype_sig);
	REQUIRE(rdata->length != 0);

	dns_rdata_toregion(rdata, &sr);

	/*
	 * Type covered.
	 */
	covered = uint16_fromregion(&sr);
	isc_region_consume(&sr, 2);
	/*
	 * XXXAG We should have something like dns_rdatatype_isknown()
	 * that does the right thing with type 0.
	 */
	if (dns_rdatatype_isknown(covered) && covered != 0) {
		RETERR(dns_rdatatype_totext(covered, target));
	} else {
		sprintf(buf, "%u", covered);
		RETERR(str_totext(buf, target));
	}
	RETERR(str_totext(" ", target));

	/*
	 * Algorithm.
	 */
	sprintf(buf, "%u", sr.base[0]);
	isc_region_consume(&sr, 1);
	RETERR(str_totext(buf, target));
	RETERR(str_totext(" ", target));

	/*
	 * Labels.
	 */
	sprintf(buf, "%u", sr.base[0]);
	isc_region_consume(&sr, 1);
	RETERR(str_totext(buf, target));
	RETERR(str_totext(" ", target));

	/*
	 * Ttl.
	 */
	ttl = uint32_fromregion(&sr);
	isc_region_consume(&sr, 4);
	sprintf(buf, "%lu", ttl);
	RETERR(str_totext(buf, target));
	RETERR(str_totext(" ", target));

	/*
	 * Sig exp.
	 */
	exp = uint32_fromregion(&sr);
	isc_region_consume(&sr, 4);
	RETERR(dns_time32_totext(exp, target));

	if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
		RETERR(str_totext(" (", target));
	RETERR(str_totext(tctx->linebreak, target));

	/*
	 * Time signed.
	 */
	when = uint32_fromregion(&sr);
	isc_region_consume(&sr, 4);
	RETERR(dns_time32_totext(when, target));
	RETERR(str_totext(" ", target));

	/*
	 * Footprint.
	 */
	foot = uint16_fromregion(&sr);
	isc_region_consume(&sr, 2);
	sprintf(buf, "%lu", foot);
	RETERR(str_totext(buf, target));
	RETERR(str_totext(" ", target));

	/*
	 * Signer.
	 */
	dns_name_init(&name, NULL);
	dns_name_init(&prefix, NULL);
	dns_name_fromregion(&name, &sr);
	isc_region_consume(&sr, name_length(&name));
	sub = name_prefix(&name, tctx->origin, &prefix);
	RETERR(dns_name_totext(&prefix, sub, target));

	/*
	 * Sig.
//.........这里部分代码省略.........

static inline int
compare_naptr(ARGS_COMPARE) {
	dns_name_t name1;
	dns_name_t name2;
	isc_region_t region1;
	isc_region_t region2;
	int order, len;

	REQUIRE(rdata1->type == rdata2->type);
	REQUIRE(rdata1->rdclass == rdata2->rdclass);
	REQUIRE(rdata1->type == dns_rdatatype_naptr);
	REQUIRE(rdata1->length != 0);
	REQUIRE(rdata2->length != 0);

	dns_rdata_toregion(rdata1, &region1);
	dns_rdata_toregion(rdata2, &region2);

	/*
	 * Order, preference.
	 */
	order = memcmp(region1.base, region2.base, 4);
	if (order != 0)
		return (order < 0 ? -1 : 1);
	isc_region_consume(&region1, 4);
	isc_region_consume(&region2, 4);

	/*
	 * Flags.
	 */
	len = ISC_MIN(region1.base[0], region2.base[0]);
	order = memcmp(region1.base, region2.base, len + 1);
	if (order != 0)
		return (order < 0 ? -1 : 1);
	isc_region_consume(&region1, region1.base[0] + 1);
	isc_region_consume(&region2, region2.base[0] + 1);

	/*
	 * Service.
	 */
	len = ISC_MIN(region1.base[0], region2.base[0]);
	order = memcmp(region1.base, region2.base, len + 1);
	if (order != 0)
		return (order < 0 ? -1 : 1);
	isc_region_consume(&region1, region1.base[0] + 1);
	isc_region_consume(&region2, region2.base[0] + 1);

	/*
	 * Regexp.
	 */
	len = ISC_MIN(region1.base[0], region2.base[0]);
	order = memcmp(region1.base, region2.base, len + 1);
	if (order != 0)
		return (order < 0 ? -1 : 1);
	isc_region_consume(&region1, region1.base[0] + 1);
	isc_region_consume(&region2, region2.base[0] + 1);

	/*
	 * Replacement.
	 */
	dns_name_init(&name1, NULL);
	dns_name_init(&name2, NULL);

	dns_name_fromregion(&name1, &region1);
	dns_name_fromregion(&name2, &region2);

	return (dns_name_rdatacompare(&name1, &name2));
}

void
dns_compress_add(dns_compress_t *cctx, const dns_name_t *name,
		 const dns_name_t *prefix, isc_uint16_t offset)
{
	dns_name_t tname, xname;
	unsigned int start;
	unsigned int n;
	unsigned int count;
	unsigned int i;
	dns_compressnode_t *node;
	unsigned int length;
	unsigned int tlength;
	isc_uint16_t toffset;
	unsigned char *tmp;
	isc_region_t r;

	REQUIRE(VALID_CCTX(cctx));
	REQUIRE(dns_name_isabsolute(name));

	if (ISC_UNLIKELY((cctx->allowed & DNS_COMPRESS_ENABLED) == 0))
		return;

	if (offset >= 0x4000)
		return;
	dns_name_init(&tname, NULL);
	dns_name_init(&xname, NULL);

	n = dns_name_countlabels(name);
	count = dns_name_countlabels(prefix);
	if (dns_name_isabsolute(prefix))
		count--;
	if (count == 0)
		return;
	start = 0;
	dns_name_toregion(name, &r);
	length = r.length;
	tmp = isc_mem_get(cctx->mctx, length);
	if (tmp == NULL)
		return;
	/*
	 * Copy name data to 'tmp' and make 'r' use 'tmp'.
	 */
	memmove(tmp, r.base, r.length);
	r.base = tmp;
	dns_name_fromregion(&xname, &r);

	if (count > 2U)
		count = 2U;

	while (count > 0) {
		unsigned char ch;

		dns_name_getlabelsequence(&xname, start, n, &tname);
		/*
		 * We calculate the table index using the first
		 * character in the first label of tname.
		 */
		ch = tname.ndata[1];
		i = tableindex[ch];
		tlength = name_length(&tname);
		toffset = (isc_uint16_t)(offset + (length - tlength));
		if (toffset >= 0x4000)
			break;
		/*
		 * Create a new node and add it.
		 */
		if (cctx->count < DNS_COMPRESS_INITIALNODES)
			node = &cctx->initialnodes[cctx->count];
		else {
			node = isc_mem_get(cctx->mctx,
					   sizeof(dns_compressnode_t));
			if (node == NULL)
				break;
		}
		node->count = cctx->count++;
		/*
		 * 'node->r.base' becomes 'tmp' when start == 0.
		 * Record this by setting 0x8000 so it can be freed later.
		 */
		if (start == 0)
			toffset |= 0x8000;
		node->offset = toffset;
		dns_name_toregion(&tname, &node->r);
		dns_name_init(&node->name, NULL);
		node->name.length = node->r.length;
		node->name.ndata = node->r.base;
		node->name.labels = tname.labels;
		node->name.attributes = DNS_NAMEATTR_ABSOLUTE;
		node->next = cctx->table[i];
		cctx->table[i] = node;
		start++;
		n--;
		count--;
	}

	if (start == 0)
		isc_mem_put(cctx->mctx, tmp, length);
}

isc_result_t
dns_ncache_getrdataset(dns_rdataset_t *ncacherdataset, dns_name_t *name,
		       dns_rdatatype_t type, dns_rdataset_t *rdataset)
{
	isc_result_t result;
	dns_rdata_t rdata = DNS_RDATA_INIT;
	isc_region_t remaining;
	isc_buffer_t source;
	dns_name_t tname;
	dns_rdatatype_t ttype;
	dns_trust_t trust = dns_trust_none;
	dns_rdataset_t clone;

	REQUIRE(ncacherdataset != NULL);
	REQUIRE(ncacherdataset->type == 0);
	REQUIRE((ncacherdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0);
	REQUIRE(name != NULL);
	REQUIRE(!dns_rdataset_isassociated(rdataset));
	REQUIRE(type != dns_rdatatype_rrsig);

	dns_rdataset_init(&clone);
	dns_rdataset_clone(ncacherdataset, &clone);
	result = dns_rdataset_first(&clone);
	while (result == ISC_R_SUCCESS) {
		dns_rdataset_current(&clone, &rdata);
		isc_buffer_init(&source, rdata.data, rdata.length);
		isc_buffer_add(&source, rdata.length);
		dns_name_init(&tname, NULL);
		isc_buffer_remainingregion(&source, &remaining);
		dns_name_fromregion(&tname, &remaining);
		INSIST(remaining.length >= tname.length);
		isc_buffer_forward(&source, tname.length);
		remaining.length -= tname.length;

		INSIST(remaining.length >= 3);
		ttype = isc_buffer_getuint16(&source);

		if (ttype == type && dns_name_equal(&tname, name)) {
			trust = isc_buffer_getuint8(&source);
			INSIST(trust <= dns_trust_ultimate);
			isc_buffer_remainingregion(&source, &remaining);
			break;
		}
		result = dns_rdataset_next(&clone);
		dns_rdata_reset(&rdata);
	}
	dns_rdataset_disassociate(&clone);
	if (result == ISC_R_NOMORE)
		return (ISC_R_NOTFOUND);
	if (result != ISC_R_SUCCESS)
		return (result);

	INSIST(remaining.length != 0);

	rdataset->methods = &rdataset_methods;
	rdataset->rdclass = ncacherdataset->rdclass;
	rdataset->type = type;
	rdataset->covers = 0;
	rdataset->ttl = ncacherdataset->ttl;
	rdataset->trust = trust;
	rdataset->private1 = NULL;
	rdataset->private2 = NULL;

	rdataset->private3 = remaining.base;

	/*
	 * Reset iterator state.
	 */
	rdataset->privateuint4 = 0;
	rdataset->private5 = NULL;
	rdataset->private6 = NULL;
	return (ISC_R_SUCCESS);
}