isc_result_t
dns_zt_mount(dns_zt_t *zt, dns_zone_t *zone) {
isc_result_t result;
dns_zone_t *dummy = NULL;
dns_name_t *name;
REQUIRE(VALID_ZT(zt));
name = dns_zone_getorigin(zone);
RWLOCK(&zt->rwlock, isc_rwlocktype_write);
result = dns_rbt_addname(zt->table, name, zone);
if (result == ISC_R_SUCCESS)
dns_zone_attach(zone, &dummy);
RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
return (result);
}
isc_result_t
dns_zt_find(dns_zt_t *zt, dns_name_t *name, unsigned int options,
dns_name_t *foundname, dns_zone_t **zonep)
{
isc_result_t result;
dns_zone_t *dummy = NULL;
unsigned int rbtoptions = 0;
REQUIRE(VALID_ZT(zt));
if ((options & DNS_ZTFIND_NOEXACT) != 0)
rbtoptions |= DNS_RBTFIND_NOEXACT;
RWLOCK(&zt->rwlock, isc_rwlocktype_read);
result = dns_rbt_findname(zt->table, name, rbtoptions, foundname,
(void **) (void*)&dummy);
if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH)
dns_zone_attach(dummy, zonep);
RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
return (result);
}
static isc_result_t
xfrout_ctx_create(isc_mem_t *mctx, ns_client_t *client, unsigned int id,
dns_name_t *qname, dns_rdatatype_t qtype,
dns_rdataclass_t qclass, dns_zone_t *zone,
dns_db_t *db, dns_dbversion_t *ver, isc_quota_t *quota,
rrstream_t *stream, dns_tsigkey_t *tsigkey,
isc_buffer_t *lasttsig, unsigned int maxtime,
unsigned int idletime, isc_boolean_t many_answers,
xfrout_ctx_t **xfrp)
{
xfrout_ctx_t *xfr;
isc_result_t result;
unsigned int len;
void *mem;
INSIST(xfrp != NULL && *xfrp == NULL);
xfr = isc_mem_get(mctx, sizeof(*xfr));
if (xfr == NULL)
return (ISC_R_NOMEMORY);
xfr->mctx = NULL;
isc_mem_attach(mctx, &xfr->mctx);
xfr->client = NULL;
ns_client_attach(client, &xfr->client);
xfr->id = id;
xfr->qname = qname;
xfr->qtype = qtype;
xfr->qclass = qclass;
xfr->zone = NULL;
xfr->db = NULL;
xfr->ver = NULL;
if (zone != NULL) /* zone will be NULL if it's DLZ */
dns_zone_attach(zone, &xfr->zone);
dns_db_attach(db, &xfr->db);
dns_db_attachversion(db, ver, &xfr->ver);
xfr->end_of_stream = ISC_FALSE;
xfr->tsigkey = tsigkey;
xfr->lasttsig = lasttsig;
xfr->txmem = NULL;
xfr->txmemlen = 0;
xfr->nmsg = 0;
xfr->many_answers = many_answers,
xfr->sends = 0;
xfr->shuttingdown = ISC_FALSE;
xfr->mnemonic = NULL;
xfr->buf.base = NULL;
xfr->buf.length = 0;
xfr->txmem = NULL;
xfr->txmemlen = 0;
xfr->stream = NULL;
xfr->quota = NULL;
/*
* Allocate a temporary buffer for the uncompressed response
* message data. The size should be no more than 65535 bytes
* so that the compressed data will fit in a TCP message,
* and no less than 65535 bytes so that an almost maximum-sized
* RR will fit. Note that although 65535-byte RRs are allowed
* in principle, they cannot be zone-transferred (at least not
* if uncompressible), because the message and RR headers would
* push the size of the TCP message over the 65536 byte limit.
*/
len = 65535;
mem = isc_mem_get(mctx, len);
if (mem == NULL) {
result = ISC_R_NOMEMORY;
goto failure;
}
isc_buffer_init(&xfr->buf, mem, len);
/*
* Allocate another temporary buffer for the compressed
* response message and its TCP length prefix.
*/
len = 2 + 65535;
mem = isc_mem_get(mctx, len);
if (mem == NULL) {
result = ISC_R_NOMEMORY;
goto failure;
}
isc_buffer_init(&xfr->txlenbuf, mem, 2);
isc_buffer_init(&xfr->txbuf, (char *) mem + 2, len - 2);
xfr->txmem = mem;
xfr->txmemlen = len;
CHECK(dns_timer_setidle(xfr->client->timer,
maxtime, idletime, ISC_FALSE));
/*
* Register a shutdown callback with the client, so that we
* can stop the transfer immediately when the client task
* gets a shutdown event.
*/
xfr->client->shutdown = xfrout_client_shutdown;
xfr->client->shutdown_arg = xfr;
/*
* These MUST be after the last "goto failure;" / CHECK to
* prevent a double free by the caller.
*/
xfr->quota = quota;
xfr->stream = stream;
*xfrp = xfr;
return (ISC_R_SUCCESS);
failure:
xfrout_ctx_destroy(&xfr);
return (result);
}
