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bind9/lib/ns/xfrout.c
Daniel Baumann f66ff7eae6
Adding upstream version 1:9.20.9. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-21 13:32:37 +02:00

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48 KiB
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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#include <inttypes.h>
#include <stdbool.h>
#include <isc/formatcheck.h>
#include <isc/mem.h>
#include <isc/netmgr.h>
#include <isc/result.h>
#include <isc/stats.h>
#include <isc/util.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/dlz.h>
#include <dns/fixedname.h>
#include <dns/journal.h>
#include <dns/message.h>
#include <dns/peer.h>
#include <dns/rdataclass.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rriterator.h>
#include <dns/soa.h>
#include <dns/stats.h>
#include <dns/tsig.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <dns/zt.h>
#include <ns/client.h>
#include <ns/log.h>
#include <ns/server.h>
#include <ns/stats.h>
#include <ns/xfrout.h>
/*! \file
* \brief
* Outgoing AXFR and IXFR.
*/
/*
* TODO:
* - IXFR over UDP
*/
#define XFROUT_COMMON_LOGARGS \
ns_lctx, DNS_LOGCATEGORY_XFER_OUT, NS_LOGMODULE_XFER_OUT
#define XFROUT_PROTOCOL_LOGARGS XFROUT_COMMON_LOGARGS, ISC_LOG_INFO
#define XFROUT_DEBUG_LOGARGS(n) XFROUT_COMMON_LOGARGS, ISC_LOG_DEBUG(n)
#define XFROUT_RR_LOGARGS XFROUT_COMMON_LOGARGS, XFROUT_RR_LOGLEVEL
#define XFROUT_RR_LOGLEVEL ISC_LOG_DEBUG(8)
/*%
* Fail unconditionally and log as a client error.
* The test against ISC_R_SUCCESS is there to keep the Solaris compiler
* from complaining about "end-of-loop code not reached".
*/
#define FAILC(code, msg) \
do { \
result = (code); \
ns_client_log(client, DNS_LOGCATEGORY_XFER_OUT, \
NS_LOGMODULE_XFER_OUT, ISC_LOG_INFO, \
"bad zone transfer request: %s (%s)", msg, \
isc_result_totext(code)); \
if (result != ISC_R_SUCCESS) \
goto failure; \
} while (0)
#define FAILQ(code, msg, question, rdclass) \
do { \
char _buf1[DNS_NAME_FORMATSIZE]; \
char _buf2[DNS_RDATACLASS_FORMATSIZE]; \
result = (code); \
dns_name_format(question, _buf1, sizeof(_buf1)); \
dns_rdataclass_format(rdclass, _buf2, sizeof(_buf2)); \
ns_client_log(client, DNS_LOGCATEGORY_XFER_OUT, \
NS_LOGMODULE_XFER_OUT, ISC_LOG_INFO, \
"bad zone transfer request: '%s/%s': %s (%s)", \
_buf1, _buf2, msg, isc_result_totext(code)); \
if (result != ISC_R_SUCCESS) \
goto failure; \
} while (0)
#define CHECK(op) \
do { \
result = (op); \
if (result != ISC_R_SUCCESS) \
goto failure; \
} while (0)
/**************************************************************************/
static void
inc_stats(ns_client_t *client, dns_zone_t *zone, isc_statscounter_t counter) {
ns_stats_increment(client->manager->sctx->nsstats, counter);
if (zone != NULL) {
isc_stats_t *zonestats = dns_zone_getrequeststats(zone);
if (zonestats != NULL) {
isc_stats_increment(zonestats, counter);
}
}
}
/**************************************************************************/
/*% Log an RR (for debugging) */
static void
log_rr(dns_name_t *name, dns_rdata_t *rdata, uint32_t ttl) {
isc_result_t result;
isc_buffer_t buf;
char mem[2000];
dns_rdatalist_t rdl;
dns_rdataset_t rds;
dns_rdata_t rd = DNS_RDATA_INIT;
dns_rdatalist_init(&rdl);
rdl.type = rdata->type;
rdl.rdclass = rdata->rdclass;
rdl.ttl = ttl;
if (rdata->type == dns_rdatatype_sig ||
rdata->type == dns_rdatatype_rrsig)
{
rdl.covers = dns_rdata_covers(rdata);
} else {
rdl.covers = dns_rdatatype_none;
}
dns_rdataset_init(&rds);
dns_rdata_init(&rd);
dns_rdata_clone(rdata, &rd);
ISC_LIST_APPEND(rdl.rdata, &rd, link);
dns_rdatalist_tordataset(&rdl, &rds);
isc_buffer_init(&buf, mem, sizeof(mem));
result = dns_rdataset_totext(&rds, name, false, false, &buf);
/*
* We could use xfrout_log(), but that would produce
* very long lines with a repetitive prefix.
*/
if (result == ISC_R_SUCCESS) {
/*
* Get rid of final newline.
*/
INSIST(buf.used >= 1 &&
((char *)buf.base)[buf.used - 1] == '\n');
buf.used--;
isc_log_write(XFROUT_RR_LOGARGS, "%.*s",
(int)isc_buffer_usedlength(&buf),
(char *)isc_buffer_base(&buf));
} else {
isc_log_write(XFROUT_RR_LOGARGS, "<RR too large to print>");
}
}
/**************************************************************************/
/*
* An 'rrstream_t' is a polymorphic iterator that returns
* a stream of resource records. There are multiple implementations,
* e.g. for generating AXFR and IXFR records streams.
*/
typedef struct rrstream_methods rrstream_methods_t;
typedef struct rrstream {
isc_mem_t *mctx;
rrstream_methods_t *methods;
} rrstream_t;
struct rrstream_methods {
isc_result_t (*first)(rrstream_t *);
isc_result_t (*next)(rrstream_t *);
void (*current)(rrstream_t *, dns_name_t **, uint32_t *,
dns_rdata_t **);
void (*pause)(rrstream_t *);
void (*destroy)(rrstream_t **);
};
static void
rrstream_noop_pause(rrstream_t *rs) {
UNUSED(rs);
}
/**************************************************************************/
/*
* An 'ixfr_rrstream_t' is an 'rrstream_t' that returns
* an IXFR-like RR stream from a journal file.
*
* The SOA at the beginning of each sequence of additions
* or deletions are included in the stream, but the extra
* SOAs at the beginning and end of the entire transfer are
* not included.
*/
typedef struct ixfr_rrstream {
rrstream_t common;
dns_journal_t *journal;
} ixfr_rrstream_t;
/* Forward declarations. */
static void
ixfr_rrstream_destroy(rrstream_t **sp);
static rrstream_methods_t ixfr_rrstream_methods;
/*
* Returns: anything dns_journal_open() or dns_journal_iter_init()
* may return.
*/
static isc_result_t
ixfr_rrstream_create(isc_mem_t *mctx, const char *journal_filename,
uint32_t begin_serial, uint32_t end_serial, size_t *sizep,
rrstream_t **sp) {
isc_result_t result;
ixfr_rrstream_t *s = NULL;
INSIST(sp != NULL && *sp == NULL);
s = isc_mem_get(mctx, sizeof(*s));
s->common.mctx = NULL;
isc_mem_attach(mctx, &s->common.mctx);
s->common.methods = &ixfr_rrstream_methods;
s->journal = NULL;
CHECK(dns_journal_open(mctx, journal_filename, DNS_JOURNAL_READ,
&s->journal));
CHECK(dns_journal_iter_init(s->journal, begin_serial, end_serial,
sizep));
*sp = (rrstream_t *)s;
return ISC_R_SUCCESS;
failure:
ixfr_rrstream_destroy((rrstream_t **)(void *)&s);
return result;
}
static isc_result_t
ixfr_rrstream_first(rrstream_t *rs) {
ixfr_rrstream_t *s = (ixfr_rrstream_t *)rs;
return dns_journal_first_rr(s->journal);
}
static isc_result_t
ixfr_rrstream_next(rrstream_t *rs) {
ixfr_rrstream_t *s = (ixfr_rrstream_t *)rs;
return dns_journal_next_rr(s->journal);
}
static void
ixfr_rrstream_current(rrstream_t *rs, dns_name_t **name, uint32_t *ttl,
dns_rdata_t **rdata) {
ixfr_rrstream_t *s = (ixfr_rrstream_t *)rs;
dns_journal_current_rr(s->journal, name, ttl, rdata);
}
static void
ixfr_rrstream_destroy(rrstream_t **rsp) {
ixfr_rrstream_t *s = (ixfr_rrstream_t *)*rsp;
if (s->journal != NULL) {
dns_journal_destroy(&s->journal);
}
isc_mem_putanddetach(&s->common.mctx, s, sizeof(*s));
}
static rrstream_methods_t ixfr_rrstream_methods = {
ixfr_rrstream_first, ixfr_rrstream_next, ixfr_rrstream_current,
rrstream_noop_pause, ixfr_rrstream_destroy
};
/**************************************************************************/
/*
* An 'axfr_rrstream_t' is an 'rrstream_t' that returns
* an AXFR-like RR stream from a database.
*
* The SOAs at the beginning and end of the transfer are
* not included in the stream.
*/
typedef struct axfr_rrstream {
rrstream_t common;
dns_rriterator_t it;
bool it_valid;
} axfr_rrstream_t;
/*
* Forward declarations.
*/
static void
axfr_rrstream_destroy(rrstream_t **rsp);
static rrstream_methods_t axfr_rrstream_methods;
static isc_result_t
axfr_rrstream_create(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *ver,
rrstream_t **sp) {
axfr_rrstream_t *s;
isc_result_t result;
INSIST(sp != NULL && *sp == NULL);
s = isc_mem_get(mctx, sizeof(*s));
s->common.mctx = NULL;
isc_mem_attach(mctx, &s->common.mctx);
s->common.methods = &axfr_rrstream_methods;
s->it_valid = false;
CHECK(dns_rriterator_init(&s->it, db, ver, 0));
s->it_valid = true;
*sp = (rrstream_t *)s;
return ISC_R_SUCCESS;
failure:
axfr_rrstream_destroy((rrstream_t **)(void *)&s);
return result;
}
static isc_result_t
axfr_rrstream_first(rrstream_t *rs) {
axfr_rrstream_t *s = (axfr_rrstream_t *)rs;
isc_result_t result;
result = dns_rriterator_first(&s->it);
if (result != ISC_R_SUCCESS) {
return result;
}
/* Skip SOA records. */
for (;;) {
dns_name_t *name_dummy = NULL;
uint32_t ttl_dummy;
dns_rdata_t *rdata = NULL;
dns_rriterator_current(&s->it, &name_dummy, &ttl_dummy, NULL,
&rdata);
if (rdata->type != dns_rdatatype_soa) {
break;
}
result = dns_rriterator_next(&s->it);
if (result != ISC_R_SUCCESS) {
break;
}
}
return result;
}
static isc_result_t
axfr_rrstream_next(rrstream_t *rs) {
axfr_rrstream_t *s = (axfr_rrstream_t *)rs;
isc_result_t result;
/* Skip SOA records. */
for (;;) {
dns_name_t *name_dummy = NULL;
uint32_t ttl_dummy;
dns_rdata_t *rdata = NULL;
result = dns_rriterator_next(&s->it);
if (result != ISC_R_SUCCESS) {
break;
}
dns_rriterator_current(&s->it, &name_dummy, &ttl_dummy, NULL,
&rdata);
if (rdata->type != dns_rdatatype_soa) {
break;
}
}
return result;
}
static void
axfr_rrstream_current(rrstream_t *rs, dns_name_t **name, uint32_t *ttl,
dns_rdata_t **rdata) {
axfr_rrstream_t *s = (axfr_rrstream_t *)rs;
dns_rriterator_current(&s->it, name, ttl, NULL, rdata);
}
static void
axfr_rrstream_pause(rrstream_t *rs) {
axfr_rrstream_t *s = (axfr_rrstream_t *)rs;
dns_rriterator_pause(&s->it);
}
static void
axfr_rrstream_destroy(rrstream_t **rsp) {
axfr_rrstream_t *s = (axfr_rrstream_t *)*rsp;
if (s->it_valid) {
dns_rriterator_destroy(&s->it);
}
isc_mem_putanddetach(&s->common.mctx, s, sizeof(*s));
}
static rrstream_methods_t axfr_rrstream_methods = {
axfr_rrstream_first, axfr_rrstream_next, axfr_rrstream_current,
axfr_rrstream_pause, axfr_rrstream_destroy
};
/**************************************************************************/
/*
* An 'soa_rrstream_t' is a degenerate 'rrstream_t' that returns
* a single SOA record.
*/
typedef struct soa_rrstream {
rrstream_t common;
dns_difftuple_t *soa_tuple;
} soa_rrstream_t;
/*
* Forward declarations.
*/
static void
soa_rrstream_destroy(rrstream_t **rsp);
static rrstream_methods_t soa_rrstream_methods;
static isc_result_t
soa_rrstream_create(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *ver,
rrstream_t **sp) {
soa_rrstream_t *s;
isc_result_t result;
INSIST(sp != NULL && *sp == NULL);
s = isc_mem_get(mctx, sizeof(*s));
s->common.mctx = NULL;
isc_mem_attach(mctx, &s->common.mctx);
s->common.methods = &soa_rrstream_methods;
s->soa_tuple = NULL;
CHECK(dns_db_createsoatuple(db, ver, mctx, DNS_DIFFOP_EXISTS,
&s->soa_tuple));
*sp = (rrstream_t *)s;
return ISC_R_SUCCESS;
failure:
soa_rrstream_destroy((rrstream_t **)(void *)&s);
return result;
}
static isc_result_t
soa_rrstream_first(rrstream_t *rs) {
UNUSED(rs);
return ISC_R_SUCCESS;
}
static isc_result_t
soa_rrstream_next(rrstream_t *rs) {
UNUSED(rs);
return ISC_R_NOMORE;
}
static void
soa_rrstream_current(rrstream_t *rs, dns_name_t **name, uint32_t *ttl,
dns_rdata_t **rdata) {
soa_rrstream_t *s = (soa_rrstream_t *)rs;
*name = &s->soa_tuple->name;
*ttl = s->soa_tuple->ttl;
*rdata = &s->soa_tuple->rdata;
}
static void
soa_rrstream_destroy(rrstream_t **rsp) {
soa_rrstream_t *s = (soa_rrstream_t *)*rsp;
if (s->soa_tuple != NULL) {
dns_difftuple_free(&s->soa_tuple);
}
isc_mem_putanddetach(&s->common.mctx, s, sizeof(*s));
}
static rrstream_methods_t soa_rrstream_methods = {
soa_rrstream_first, soa_rrstream_next, soa_rrstream_current,
rrstream_noop_pause, soa_rrstream_destroy
};
/**************************************************************************/
/*
* A 'compound_rrstream_t' objects owns a soa_rrstream
* and another rrstream, the "data stream". It returns
* a concatenated stream consisting of the soa_rrstream, then
* the data stream, then the soa_rrstream again.
*
* The component streams are owned by the compound_rrstream_t
* and are destroyed with it.
*/
typedef struct compound_rrstream {
rrstream_t common;
rrstream_t *components[3];
int state;
isc_result_t result;
} compound_rrstream_t;
/*
* Forward declarations.
*/
static void
compound_rrstream_destroy(rrstream_t **rsp);
static isc_result_t
compound_rrstream_next(rrstream_t *rs);
static rrstream_methods_t compound_rrstream_methods;
/*
* Requires:
* soa_stream != NULL && *soa_stream != NULL
* data_stream != NULL && *data_stream != NULL
* sp != NULL && *sp == NULL
*
* Ensures:
* *soa_stream == NULL
* *data_stream == NULL
* *sp points to a valid compound_rrstream_t
* The soa and data streams will be destroyed
* when the compound_rrstream_t is destroyed.
*/
static isc_result_t
compound_rrstream_create(isc_mem_t *mctx, rrstream_t **soa_stream,
rrstream_t **data_stream, rrstream_t **sp) {
compound_rrstream_t *s;
INSIST(sp != NULL && *sp == NULL);
s = isc_mem_get(mctx, sizeof(*s));
s->common.mctx = NULL;
isc_mem_attach(mctx, &s->common.mctx);
s->common.methods = &compound_rrstream_methods;
s->components[0] = *soa_stream;
s->components[1] = *data_stream;
s->components[2] = *soa_stream;
s->state = -1;
s->result = ISC_R_FAILURE;
*data_stream = NULL;
*soa_stream = NULL;
*sp = (rrstream_t *)s;
return ISC_R_SUCCESS;
}
static isc_result_t
compound_rrstream_first(rrstream_t *rs) {
compound_rrstream_t *s = (compound_rrstream_t *)rs;
s->state = 0;
do {
rrstream_t *curstream = s->components[s->state];
s->result = curstream->methods->first(curstream);
} while (s->result == ISC_R_NOMORE && s->state < 2);
return s->result;
}
static isc_result_t
compound_rrstream_next(rrstream_t *rs) {
compound_rrstream_t *s = (compound_rrstream_t *)rs;
rrstream_t *curstream = s->components[s->state];
s->result = curstream->methods->next(curstream);
while (s->result == ISC_R_NOMORE) {
/*
* Make sure locks held by the current stream
* are released before we switch streams.
*/
curstream->methods->pause(curstream);
if (s->state == 2) {
return ISC_R_NOMORE;
}
s->state++;
curstream = s->components[s->state];
s->result = curstream->methods->first(curstream);
}
return s->result;
}
static void
compound_rrstream_current(rrstream_t *rs, dns_name_t **name, uint32_t *ttl,
dns_rdata_t **rdata) {
compound_rrstream_t *s = (compound_rrstream_t *)rs;
rrstream_t *curstream;
INSIST(0 <= s->state && s->state < 3);
INSIST(s->result == ISC_R_SUCCESS);
curstream = s->components[s->state];
curstream->methods->current(curstream, name, ttl, rdata);
}
static void
compound_rrstream_pause(rrstream_t *rs) {
compound_rrstream_t *s = (compound_rrstream_t *)rs;
rrstream_t *curstream;
INSIST(0 <= s->state && s->state < 3);
curstream = s->components[s->state];
curstream->methods->pause(curstream);
}
static void
compound_rrstream_destroy(rrstream_t **rsp) {
compound_rrstream_t *s = (compound_rrstream_t *)*rsp;
s->components[0]->methods->destroy(&s->components[0]);
s->components[1]->methods->destroy(&s->components[1]);
s->components[2] = NULL; /* Copy of components[0]. */
isc_mem_putanddetach(&s->common.mctx, s, sizeof(*s));
}
static rrstream_methods_t compound_rrstream_methods = {
compound_rrstream_first, compound_rrstream_next,
compound_rrstream_current, compound_rrstream_pause,
compound_rrstream_destroy
};
/**************************************************************************/
/*%
* Structure holding outgoing transfer statistics
*/
struct xfr_stats {
uint64_t nmsg; /*%< Number of messages sent */
uint64_t nrecs; /*%< Number of records sent */
uint64_t nbytes; /*%< Number of bytes sent */
isc_time_t start; /*%< Start time of the transfer */
isc_time_t end; /*%< End time of the transfer */
};
/*%
* An 'xfrout_ctx_t' contains the state of an outgoing AXFR or IXFR
* in progress.
*/
typedef struct {
isc_mem_t *mctx;
ns_client_t *client;
unsigned int id; /* ID of request */
dns_name_t *qname; /* Question name of request */
dns_rdatatype_t qtype; /* dns_rdatatype_{a,i}xfr */
dns_rdataclass_t qclass;
dns_zone_t *zone; /* (necessary for stats) */
dns_db_t *db;
dns_dbversion_t *ver;
rrstream_t *stream; /* The XFR RR stream */
bool question_added; /* QUESTION section sent? */
bool end_of_stream; /* EOS has been reached */
isc_buffer_t buf; /* Buffer for message owner
* names and rdatas */
isc_buffer_t txbuf; /* Transmit message buffer */
size_t cbytes; /* Length of current message */
void *txmem;
unsigned int txmemlen;
dns_tsigkey_t *tsigkey; /* Key used to create TSIG */
isc_buffer_t *lasttsig; /* the last TSIG */
bool verified_tsig; /* verified request MAC */
bool many_answers;
int sends; /* Send in progress */
bool shuttingdown;
bool poll;
const char *mnemonic; /* Style of transfer */
uint32_t end_serial; /* Serial number after XFR is done */
struct xfr_stats stats; /*%< Transfer statistics */
/* Timeouts */
uint64_t maxtime; /*%< Maximum XFR timeout (in ms) */
isc_nm_timer_t *maxtime_timer;
uint64_t idletime; /*%< XFR idle timeout (in ms) */
/* Delayed send */
isc_nm_timer_t *delayed_send_timer;
} xfrout_ctx_t;
static void
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, rrstream_t *stream,
dns_tsigkey_t *tsigkey, isc_buffer_t *lasttsig,
bool verified_tsig, unsigned int maxtime,
unsigned int idletime, bool many_answers,
xfrout_ctx_t **xfrp);
static void
sendstream(xfrout_ctx_t *xfr);
static void
xfrout_senddone(isc_nmhandle_t *handle, isc_result_t result, void *arg);
static void
xfrout_fail(xfrout_ctx_t *xfr, isc_result_t result, const char *msg);
static void
xfrout_maybe_destroy(xfrout_ctx_t *xfr);
static void
xfrout_ctx_destroy(xfrout_ctx_t **xfrp);
static void
xfrout_client_timeout(void *arg, isc_result_t result);
static void
xfrout_log1(ns_client_t *client, dns_name_t *zonename, dns_rdataclass_t rdclass,
int level, const char *fmt, ...) ISC_FORMAT_PRINTF(5, 6);
static void
xfrout_log(xfrout_ctx_t *xfr, int level, const char *fmt, ...)
ISC_FORMAT_PRINTF(3, 4);
static void
xfrout_delayed_timeout(void *arg, isc_result_t result);
/**************************************************************************/
void
ns_xfr_start(ns_client_t *client, dns_rdatatype_t reqtype) {
isc_result_t result;
dns_name_t *question_name;
dns_rdataset_t *question_rdataset;
dns_zone_t *zone = NULL, *raw = NULL, *mayberaw;
dns_db_t *db = NULL;
dns_dbversion_t *ver = NULL;
dns_rdataclass_t question_class;
rrstream_t *soa_stream = NULL;
rrstream_t *data_stream = NULL;
rrstream_t *stream = NULL;
dns_difftuple_t *current_soa_tuple = NULL;
dns_name_t *soa_name;
dns_rdataset_t *soa_rdataset;
dns_rdata_t soa_rdata = DNS_RDATA_INIT;
bool have_soa = false;
const char *mnemonic = NULL;
isc_mem_t *mctx = client->manager->mctx;
dns_message_t *request = client->message;
xfrout_ctx_t *xfr = NULL;
dns_transfer_format_t format = client->view->transfer_format;
isc_netaddr_t na;
dns_peer_t *peer = NULL;
isc_buffer_t *tsigbuf = NULL;
char *journalfile;
char msg[NS_CLIENT_ACLMSGSIZE("zone transfer")];
char keyname[DNS_NAME_FORMATSIZE];
bool is_poll = false;
bool is_dlz = false;
bool is_ixfr = false;
bool useviewacl = false;
uint32_t begin_serial = 0, current_serial;
switch (reqtype) {
case dns_rdatatype_axfr:
mnemonic = "AXFR";
break;
case dns_rdatatype_ixfr:
mnemonic = "IXFR";
break;
default:
UNREACHABLE();
}
ns_client_log(client, DNS_LOGCATEGORY_XFER_OUT, NS_LOGMODULE_XFER_OUT,
ISC_LOG_DEBUG(6), "%s request", mnemonic);
/*
* Apply quota.
*/
result = isc_quota_acquire(&client->manager->sctx->xfroutquota);
if (result != ISC_R_SUCCESS) {
isc_log_write(XFROUT_COMMON_LOGARGS, ISC_LOG_WARNING,
"%s request denied: %s", mnemonic,
isc_result_totext(result));
goto max_quota;
}
/*
* Interpret the question section.
*/
result = dns_message_firstname(request, DNS_SECTION_QUESTION);
INSIST(result == ISC_R_SUCCESS);
/*
* The question section must contain exactly one question, and
* it must be for AXFR/IXFR as appropriate.
*/
question_name = NULL;
dns_message_currentname(request, DNS_SECTION_QUESTION, &question_name);
question_rdataset = ISC_LIST_HEAD(question_name->list);
question_class = question_rdataset->rdclass;
INSIST(question_rdataset->type == reqtype);
if (ISC_LIST_NEXT(question_rdataset, link) != NULL) {
FAILC(DNS_R_FORMERR, "multiple questions");
}
result = dns_message_nextname(request, DNS_SECTION_QUESTION);
if (result != ISC_R_NOMORE) {
FAILC(DNS_R_FORMERR, "multiple questions");
}
result = dns_view_findzone(client->view, question_name,
DNS_ZTFIND_EXACT, &zone);
if (result != ISC_R_SUCCESS || dns_zone_gettype(zone) == dns_zone_dlz) {
/*
* The normal zone table does not have a match, or this is
* marked in the zone table as a DLZ zone. Check the DLZ
* databases for a match.
*/
if (!ISC_LIST_EMPTY(client->view->dlz_searched)) {
result = dns_dlzallowzonexfr(client->view,
question_name,
&client->peeraddr, &db);
if (result == ISC_R_DEFAULT) {
useviewacl = true;
result = ISC_R_SUCCESS;
}
if (result == ISC_R_NOPERM) {
char _buf1[DNS_NAME_FORMATSIZE];
char _buf2[DNS_RDATACLASS_FORMATSIZE];
result = DNS_R_REFUSED;
dns_name_format(question_name, _buf1,
sizeof(_buf1));
dns_rdataclass_format(question_class, _buf2,
sizeof(_buf2));
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_XFER_OUT,
ISC_LOG_ERROR,
"zone transfer '%s/%s' denied",
_buf1, _buf2);
goto failure;
}
if (result != ISC_R_SUCCESS) {
FAILQ(DNS_R_NOTAUTH, "non-authoritative zone",
question_name, question_class);
}
is_dlz = true;
} else {
/*
* not DLZ and not in normal zone table, we are
* not authoritative
*/
FAILQ(DNS_R_NOTAUTH, "non-authoritative zone",
question_name, question_class);
}
} else {
/* zone table has a match */
switch (dns_zone_gettype(zone)) {
/*
* Primary, secondary, and mirror zones are OK for transfer.
*/
case dns_zone_primary:
case dns_zone_secondary:
case dns_zone_mirror:
case dns_zone_dlz:
break;
default:
FAILQ(DNS_R_NOTAUTH, "non-authoritative zone",
question_name, question_class);
}
CHECK(dns_zone_getdb(zone, &db));
dns_db_currentversion(db, &ver);
}
xfrout_log1(client, question_name, question_class, ISC_LOG_DEBUG(6),
"%s question section OK", mnemonic);
/*
* Check the authority section. Look for a SOA record with
* the same name and class as the question.
*/
for (result = dns_message_firstname(request, DNS_SECTION_AUTHORITY);
result == ISC_R_SUCCESS;
result = dns_message_nextname(request, DNS_SECTION_AUTHORITY))
{
soa_name = NULL;
dns_message_currentname(request, DNS_SECTION_AUTHORITY,
&soa_name);
/*
* Ignore data whose owner name is not the zone apex.
*/
if (!dns_name_equal(soa_name, question_name)) {
continue;
}
for (soa_rdataset = ISC_LIST_HEAD(soa_name->list);
soa_rdataset != NULL;
soa_rdataset = ISC_LIST_NEXT(soa_rdataset, link))
{
/*
* Ignore non-SOA data.
*/
if (soa_rdataset->type != dns_rdatatype_soa) {
continue;
}
if (soa_rdataset->rdclass != question_class) {
continue;
}
CHECK(dns_rdataset_first(soa_rdataset));
dns_rdataset_current(soa_rdataset, &soa_rdata);
result = dns_rdataset_next(soa_rdataset);
if (result == ISC_R_SUCCESS) {
FAILC(DNS_R_FORMERR, "IXFR authority section "
"has multiple SOAs");
}
have_soa = true;
goto got_soa;
}
}
got_soa:
if (result != ISC_R_NOMORE) {
CHECK(result);
}
xfrout_log1(client, question_name, question_class, ISC_LOG_DEBUG(6),
"%s authority section OK", mnemonic);
/*
* If not a DLZ zone or we are falling back to the view's transfer
* ACL, decide whether to allow this transfer.
*/
if (!is_dlz || useviewacl) {
dns_acl_t *acl;
ns_client_aclmsg("zone transfer", question_name, reqtype,
client->view->rdclass, msg, sizeof(msg));
if (useviewacl) {
acl = client->view->transferacl;
} else {
acl = dns_zone_getxfracl(zone);
}
CHECK(ns_client_checkacl(client, NULL, msg, acl, true,
ISC_LOG_ERROR));
}
/*
* AXFR over UDP is not possible.
*/
if (reqtype == dns_rdatatype_axfr &&
(client->attributes & NS_CLIENTATTR_TCP) == 0)
{
FAILC(DNS_R_FORMERR, "attempted AXFR over UDP");
}
/*
* Look up the requesting server in the peer table.
*/
isc_netaddr_fromsockaddr(&na, &client->peeraddr);
(void)dns_peerlist_peerbyaddr(client->view->peers, &na, &peer);
/*
* Decide on the transfer format (one-answer or many-answers).
*/
if (peer != NULL) {
(void)dns_peer_gettransferformat(peer, &format);
}
/*
* Get a dynamically allocated copy of the current SOA.
*/
if (is_dlz) {
dns_db_currentversion(db, &ver);
}
CHECK(dns_db_createsoatuple(db, ver, mctx, DNS_DIFFOP_EXISTS,
&current_soa_tuple));
current_serial = dns_soa_getserial(&current_soa_tuple->rdata);
if (reqtype == dns_rdatatype_ixfr) {
size_t jsize;
uint64_t dbsize;
if (!have_soa) {
FAILC(DNS_R_FORMERR, "IXFR request missing SOA");
}
begin_serial = dns_soa_getserial(&soa_rdata);
/*
* RFC1995 says "If an IXFR query with the same or
* newer version number than that of the server
* is received, it is replied to with a single SOA
* record of the server's current version, just as
* in AXFR". The claim about AXFR is incorrect,
* but other than that, we do as the RFC says.
*
* Sending a single SOA record is also how we refuse
* IXFR over UDP (currently, we always do).
*/
if (DNS_SERIAL_GE(begin_serial, current_serial) ||
(client->attributes & NS_CLIENTATTR_TCP) == 0)
{
CHECK(soa_rrstream_create(mctx, db, ver, &stream));
is_poll = true;
goto have_stream;
}
/*
* Outgoing IXFR may have been disabled for this peer
* or globally.
*/
if ((client->attributes & NS_CLIENTATTR_TCP) != 0) {
bool provide_ixfr;
provide_ixfr = client->view->provideixfr;
if (peer != NULL) {
(void)dns_peer_getprovideixfr(peer,
&provide_ixfr);
}
if (!provide_ixfr) {
xfrout_log1(client, question_name,
question_class, ISC_LOG_DEBUG(4),
"IXFR delta response disabled due "
"to 'provide-ixfr no;' being set");
mnemonic = "AXFR-style IXFR";
goto axfr_fallback;
}
}
journalfile = is_dlz ? NULL : dns_zone_getjournal(zone);
if (journalfile != NULL) {
result = ixfr_rrstream_create(
mctx, journalfile, begin_serial, current_serial,
&jsize, &data_stream);
} else {
result = ISC_R_NOTFOUND;
}
if (result == ISC_R_NOTFOUND || result == ISC_R_RANGE) {
xfrout_log1(client, question_name, question_class,
ISC_LOG_INFO,
"IXFR version not in journal, "
"falling back to AXFR");
mnemonic = "AXFR-style IXFR";
goto axfr_fallback;
}
CHECK(result);
result = dns_db_getsize(db, ver, NULL, &dbsize);
if (result == ISC_R_SUCCESS) {
uint32_t ratio = dns_zone_getixfrratio(zone);
if (ratio != 0 && ((100 * jsize) / dbsize) > ratio) {
data_stream->methods->destroy(&data_stream);
data_stream = NULL;
xfrout_log1(client, question_name,
question_class, ISC_LOG_INFO,
"IXFR delta size (%zu bytes) "
"exceeds the maximum ratio to "
"database size "
"(%" PRIu64 " bytes), "
"falling back to AXFR",
jsize, dbsize);
mnemonic = "AXFR-style IXFR";
goto axfr_fallback;
} else {
xfrout_log1(client, question_name,
question_class, ISC_LOG_DEBUG(4),
"IXFR delta size (%zu bytes); "
"database size "
"(%" PRIu64 " bytes)",
jsize, dbsize);
}
}
is_ixfr = true;
} else {
axfr_fallback:
CHECK(axfr_rrstream_create(mctx, db, ver, &data_stream));
}
/*
* Bracket the data stream with SOAs.
*/
CHECK(soa_rrstream_create(mctx, db, ver, &soa_stream));
CHECK(compound_rrstream_create(mctx, &soa_stream, &data_stream,
&stream));
soa_stream = NULL;
data_stream = NULL;
have_stream:
CHECK(dns_message_getquerytsig(request, mctx, &tsigbuf));
/*
* Create the xfrout context object. This transfers the ownership
* of "stream", "db", "ver", and "quota" to the xfrout context object.
*/
if (is_dlz) {
xfrout_ctx_create(mctx, client, request->id, question_name,
reqtype, question_class, zone, db, ver,
stream, dns_message_gettsigkey(request),
tsigbuf, request->verified_sig, 3600, 3600,
(format == dns_many_answers) ? true : false,
&xfr);
} else {
xfrout_ctx_create(
mctx, client, request->id, question_name, reqtype,
question_class, zone, db, ver, stream,
dns_message_gettsigkey(request), tsigbuf,
request->verified_sig, dns_zone_getmaxxfrout(zone),
dns_zone_getidleout(zone),
(format == dns_many_answers) ? true : false, &xfr);
}
xfr->end_serial = current_serial;
xfr->mnemonic = mnemonic;
stream = NULL;
CHECK(xfr->stream->methods->first(xfr->stream));
if (xfr->tsigkey != NULL) {
dns_name_format(xfr->tsigkey->name, keyname, sizeof(keyname));
} else {
keyname[0] = '\0';
}
xfr->poll = is_poll;
if (is_poll) {
xfr->mnemonic = "IXFR poll response";
xfrout_log1(client, question_name, question_class,
ISC_LOG_DEBUG(1), "IXFR poll up to date%s%s",
(xfr->tsigkey != NULL) ? ": TSIG " : "", keyname);
} else if (is_ixfr) {
xfrout_log1(client, question_name, question_class, ISC_LOG_INFO,
"%s started%s%s (serial %u -> %u)", mnemonic,
(xfr->tsigkey != NULL) ? ": TSIG " : "", keyname,
begin_serial, current_serial);
} else {
xfrout_log1(client, question_name, question_class, ISC_LOG_INFO,
"%s started%s%s (serial %u)", mnemonic,
(xfr->tsigkey != NULL) ? ": TSIG " : "", keyname,
current_serial);
}
if (zone != NULL) {
dns_zone_getraw(zone, &raw);
mayberaw = (raw != NULL) ? raw : zone;
if ((client->attributes & NS_CLIENTATTR_WANTEXPIRE) != 0 &&
(dns_zone_gettype(mayberaw) == dns_zone_secondary ||
dns_zone_gettype(mayberaw) == dns_zone_mirror))
{
isc_time_t expiretime;
uint32_t secs;
dns_zone_getexpiretime(zone, &expiretime);
secs = isc_time_seconds(&expiretime);
if (secs >= client->now && result == ISC_R_SUCCESS) {
client->attributes |= NS_CLIENTATTR_HAVEEXPIRE;
client->expire = secs - client->now;
}
}
if (raw != NULL) {
dns_zone_detach(&raw);
}
}
/* Start the timers */
if (xfr->maxtime > 0) {
xfrout_log(xfr, ISC_LOG_DEBUG(1),
"starting maxtime timer %" PRIu64 " ms",
xfr->maxtime);
isc_nm_timer_start(xfr->maxtime_timer, xfr->maxtime);
}
/*
* Hand the context over to sendstream(). Set xfr to NULL;
* sendstream() is responsible for either passing the
* context on to a later event handler or destroying it.
*/
sendstream(xfr);
xfr = NULL;
result = ISC_R_SUCCESS;
failure:
if (result == DNS_R_REFUSED) {
inc_stats(client, zone, ns_statscounter_xfrrej);
}
if (current_soa_tuple != NULL) {
dns_difftuple_free(&current_soa_tuple);
}
if (stream != NULL) {
stream->methods->destroy(&stream);
}
if (soa_stream != NULL) {
soa_stream->methods->destroy(&soa_stream);
}
if (data_stream != NULL) {
data_stream->methods->destroy(&data_stream);
}
if (ver != NULL) {
dns_db_closeversion(db, &ver, false);
}
if (db != NULL) {
dns_db_detach(&db);
}
if (zone != NULL) {
dns_zone_detach(&zone);
}
if (xfr != NULL) {
xfrout_fail(xfr, result, "setting up zone transfer");
} else if (result != ISC_R_SUCCESS) {
isc_quota_release(&client->manager->sctx->xfroutquota);
max_quota:
ns_client_log(client, DNS_LOGCATEGORY_XFER_OUT,
NS_LOGMODULE_XFER_OUT, ISC_LOG_DEBUG(3),
"zone transfer setup failed");
ns_client_error(client, result);
isc_nmhandle_detach(&client->reqhandle);
}
}
static void
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, rrstream_t *stream,
dns_tsigkey_t *tsigkey, isc_buffer_t *lasttsig,
bool verified_tsig, unsigned int maxtime,
unsigned int idletime, bool many_answers,
xfrout_ctx_t **xfrp) {
xfrout_ctx_t *xfr = NULL;
unsigned int len = NS_CLIENT_TCP_BUFFER_SIZE;
void *mem = NULL;
REQUIRE(xfrp != NULL && *xfrp == NULL);
xfr = isc_mem_get(mctx, sizeof(*xfr));
*xfr = (xfrout_ctx_t){
.client = client,
.id = id,
.qname = qname,
.qtype = qtype,
.qclass = qclass,
.maxtime = maxtime * 1000, /* in milliseconds */
.idletime = idletime * 1000, /* In milliseconds */
.tsigkey = tsigkey,
.lasttsig = lasttsig,
.verified_tsig = verified_tsig,
.many_answers = many_answers,
};
isc_mem_attach(mctx, &xfr->mctx);
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->stats.start = isc_time_now();
isc_nm_timer_create(xfr->client->handle, xfrout_client_timeout, xfr,
&xfr->maxtime_timer);
isc_nm_timer_create(xfr->client->handle, xfrout_delayed_timeout, xfr,
&xfr->delayed_send_timer);
/*
* Allocate a temporary buffer for the uncompressed response
* message data. The buffer size must be 65535 bytes
* (NS_CLIENT_TCP_BUFFER_SIZE): small enough that compressed
* data will fit in a single TCP message, and big enough to
* hold a maximum-sized RR.
*
* 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 65535 byte limit.
*/
mem = isc_mem_get(mctx, len);
isc_buffer_init(&xfr->buf, mem, len);
/*
* Allocate another temporary buffer for the compressed
* response message.
*/
mem = isc_mem_get(mctx, len);
isc_buffer_init(&xfr->txbuf, (char *)mem, len);
xfr->txmem = mem;
xfr->txmemlen = len;
/*
* These MUST be after the last "goto failure;" / CHECK to
* prevent a double free by the caller.
*/
xfr->stream = stream;
*xfrp = xfr;
}
static void
xfrout_send(xfrout_ctx_t *xfr) {
const bool is_tcp = ((xfr->client->attributes & NS_CLIENTATTR_TCP) !=
0);
if (is_tcp) {
isc_region_t used;
isc_buffer_usedregion(&xfr->txbuf, &used);
isc_nmhandle_attach(xfr->client->handle,
&xfr->client->sendhandle);
if (xfr->idletime > 0) {
isc_nmhandle_setwritetimeout(xfr->client->sendhandle,
xfr->idletime);
}
isc_nm_send(xfr->client->sendhandle, &used, xfrout_senddone,
xfr);
xfr->sends++;
xfr->cbytes = used.length;
} else {
ns_client_send(xfr->client);
xfr->stream->methods->pause(xfr->stream);
isc_nmhandle_detach(&xfr->client->reqhandle);
xfrout_ctx_destroy(&xfr);
}
}
static void
xfrout_delayed_timeout(void *arg, isc_result_t result) {
xfrout_ctx_t *xfr = (xfrout_ctx_t *)arg;
UNUSED(result);
isc_nm_timer_stop(xfr->delayed_send_timer);
xfrout_send(xfr);
}
static void
xfrout_enqueue_send(xfrout_ctx_t *xfr) {
uint64_t timeout = 0;
/*
* System test helper options to simulate network issues.
*
* Both "transferslowly" and "transferstuck" are not meant to be
* used together (and are not actually used this way).
*/
if (ns_server_getoption(xfr->client->manager->sctx,
NS_SERVER_TRANSFERSLOWLY))
{
/* Sleep for a bit over a second. */
timeout = 1000;
} else if (ns_server_getoption(xfr->client->manager->sctx,
NS_SERVER_TRANSFERSTUCK))
{
/* Sleep for a bit over a minute. */
timeout = 60 * 1000;
}
if (timeout == 0) {
xfrout_send(xfr);
return;
}
/* delay */
isc_nm_timer_start(xfr->delayed_send_timer, timeout);
}
/*
* Arrange to send as much as we can of "stream" without blocking.
*
* Requires:
* The stream iterator is initialized and points at an RR,
* or possibly at the end of the stream (that is, the
* _first method of the iterator has been called).
*/
static void
sendstream(xfrout_ctx_t *xfr) {
dns_message_t *tcpmsg = NULL;
dns_message_t *msg = NULL; /* Client message if UDP, tcpmsg if TCP */
isc_result_t result;
dns_rdataset_t *qrdataset;
dns_name_t *msgname = NULL;
dns_rdata_t *msgrdata = NULL;
dns_rdatalist_t *msgrdl = NULL;
dns_rdataset_t *msgrds = NULL;
dns_compress_t cctx;
bool cleanup_cctx = false;
bool is_tcp;
int n_rrs;
isc_buffer_clear(&xfr->buf);
isc_buffer_clear(&xfr->txbuf);
is_tcp = ((xfr->client->attributes & NS_CLIENTATTR_TCP) != 0);
if (!is_tcp) {
/*
* In the UDP case, we put the response data directly into
* the client message.
*/
msg = xfr->client->message;
CHECK(dns_message_reply(msg, true));
} else {
/*
* TCP. Build a response dns_message_t, temporarily storing
* the raw, uncompressed owner names and RR data contiguously
* in xfr->buf. We know that if the uncompressed data fits
* in xfr->buf, the compressed data will surely fit in a TCP
* message.
*/
dns_message_create(xfr->mctx, NULL, NULL,
DNS_MESSAGE_INTENTRENDER, &tcpmsg);
msg = tcpmsg;
msg->id = xfr->id;
msg->rcode = dns_rcode_noerror;
msg->flags = DNS_MESSAGEFLAG_QR | DNS_MESSAGEFLAG_AA;
if ((xfr->client->attributes & NS_CLIENTATTR_RA) != 0) {
msg->flags |= DNS_MESSAGEFLAG_RA;
}
CHECK(dns_message_settsigkey(msg, xfr->tsigkey));
dns_message_setquerytsig(msg, xfr->lasttsig);
if (xfr->lasttsig != NULL) {
isc_buffer_free(&xfr->lasttsig);
}
msg->verified_sig = xfr->verified_tsig;
/*
* Add a EDNS option to the message?
*/
if ((xfr->client->attributes & NS_CLIENTATTR_WANTOPT) != 0) {
dns_rdataset_t *opt = NULL;
CHECK(ns_client_addopt(xfr->client, msg, &opt));
CHECK(dns_message_setopt(msg, opt));
/*
* Add to first message only.
*/
xfr->client->attributes &= ~NS_CLIENTATTR_WANTNSID;
xfr->client->attributes &= ~NS_CLIENTATTR_HAVEEXPIRE;
}
/*
* Account for reserved space.
*/
if (xfr->tsigkey != NULL) {
INSIST(msg->reserved != 0U);
}
isc_buffer_add(&xfr->buf, msg->reserved);
/*
* Include a question section in the first message only.
* BIND 8.2.1 will not recognize an IXFR if it does not
* have a question section.
*/
if (!xfr->question_added) {
dns_name_t *qname = NULL;
isc_region_t r;
/*
* Reserve space for the 12-byte message header
* and 4 bytes of question.
*/
isc_buffer_add(&xfr->buf, 12 + 4);
qrdataset = NULL;
dns_message_gettemprdataset(msg, &qrdataset);
dns_rdataset_makequestion(qrdataset,
xfr->client->message->rdclass,
xfr->qtype);
dns_message_gettempname(msg, &qname);
isc_buffer_availableregion(&xfr->buf, &r);
INSIST(r.length >= xfr->qname->length);
r.length = xfr->qname->length;
isc_buffer_putmem(&xfr->buf, xfr->qname->ndata,
xfr->qname->length);
dns_name_fromregion(qname, &r);
ISC_LIST_INIT(qname->list);
ISC_LIST_APPEND(qname->list, qrdataset, link);
dns_message_addname(msg, qname, DNS_SECTION_QUESTION);
xfr->question_added = true;
} else {
/*
* Reserve space for the 12-byte message header
*/
isc_buffer_add(&xfr->buf, 12);
msg->tcp_continuation = 1;
}
}
/*
* Try to fit in as many RRs as possible, unless "one-answer"
* format has been requested.
*/
for (n_rrs = 0;; n_rrs++) {
dns_name_t *name = NULL;
uint32_t ttl;
dns_rdata_t *rdata = NULL;
unsigned int size;
isc_region_t r;
msgname = NULL;
msgrdata = NULL;
msgrdl = NULL;
msgrds = NULL;
xfr->stream->methods->current(xfr->stream, &name, &ttl, &rdata);
size = name->length + 10 + rdata->length;
isc_buffer_availableregion(&xfr->buf, &r);
if (size >= r.length) {
/*
* RR would not fit. If there are other RRs in the
* buffer, send them now and leave this RR to the
* next message. If this RR overflows the buffer
* all by itself, fail.
*
* In theory some RRs might fit in a TCP message
* when compressed even if they do not fit when
* uncompressed, but surely we don't want
* to send such monstrosities to an unsuspecting
* secondary.
*/
if (n_rrs == 0) {
xfrout_log(xfr, ISC_LOG_WARNING,
"RR too large for zone transfer "
"(%d bytes)",
size);
/* XXX DNS_R_RRTOOLARGE? */
result = ISC_R_NOSPACE;
goto failure;
}
break;
}
if (isc_log_wouldlog(ns_lctx, XFROUT_RR_LOGLEVEL)) {
log_rr(name, rdata, ttl); /* XXX */
}
dns_message_gettempname(msg, &msgname);
isc_buffer_availableregion(&xfr->buf, &r);
INSIST(r.length >= name->length);
r.length = name->length;
isc_buffer_putmem(&xfr->buf, name->ndata, name->length);
dns_name_fromregion(msgname, &r);
/* Reserve space for RR header. */
isc_buffer_add(&xfr->buf, 10);
dns_message_gettemprdata(msg, &msgrdata);
isc_buffer_availableregion(&xfr->buf, &r);
r.length = rdata->length;
isc_buffer_putmem(&xfr->buf, rdata->data, rdata->length);
dns_rdata_init(msgrdata);
dns_rdata_fromregion(msgrdata, rdata->rdclass, rdata->type, &r);
dns_message_gettemprdatalist(msg, &msgrdl);
msgrdl->type = rdata->type;
msgrdl->rdclass = rdata->rdclass;
msgrdl->ttl = ttl;
if (rdata->type == dns_rdatatype_sig ||
rdata->type == dns_rdatatype_rrsig)
{
msgrdl->covers = dns_rdata_covers(rdata);
} else {
msgrdl->covers = dns_rdatatype_none;
}
ISC_LIST_APPEND(msgrdl->rdata, msgrdata, link);
dns_message_gettemprdataset(msg, &msgrds);
dns_rdatalist_tordataset(msgrdl, msgrds);
ISC_LIST_APPEND(msgname->list, msgrds, link);
dns_message_addname(msg, msgname, DNS_SECTION_ANSWER);
msgname = NULL;
xfr->stats.nrecs++;
result = xfr->stream->methods->next(xfr->stream);
if (result == ISC_R_NOMORE) {
xfr->end_of_stream = true;
break;
}
CHECK(result);
if (!xfr->many_answers) {
break;
}
/*
* At this stage, at least 1 RR has been rendered into
* the message. Check if we want to clamp this message
* here (TCP only).
*/
if ((isc_buffer_usedlength(&xfr->buf) >=
xfr->client->manager->sctx->transfer_tcp_message_size) &&
is_tcp)
{
break;
}
}
if (is_tcp) {
dns_compress_init(&cctx, xfr->mctx,
DNS_COMPRESS_CASE | DNS_COMPRESS_LARGE);
cleanup_cctx = true;
CHECK(dns_message_renderbegin(msg, &cctx, &xfr->txbuf));
CHECK(dns_message_rendersection(msg, DNS_SECTION_QUESTION, 0));
CHECK(dns_message_rendersection(msg, DNS_SECTION_ANSWER, 0));
CHECK(dns_message_renderend(msg));
dns_compress_invalidate(&cctx);
cleanup_cctx = false;
xfrout_log(xfr, ISC_LOG_DEBUG(8),
"sending TCP message of %d bytes",
isc_buffer_usedlength(&xfr->txbuf));
xfrout_enqueue_send(xfr);
} else {
xfrout_log(xfr, ISC_LOG_DEBUG(8), "sending IXFR UDP response");
xfrout_enqueue_send(xfr);
return;
}
/* Advance lasttsig to be the last TSIG generated */
CHECK(dns_message_getquerytsig(msg, xfr->mctx, &xfr->lasttsig));
failure:
if (tcpmsg != NULL) {
dns_message_detach(&tcpmsg);
}
if (cleanup_cctx) {
dns_compress_invalidate(&cctx);
}
/*
* Make sure to release any locks held by database
* iterators before returning from the event handler.
*/
xfr->stream->methods->pause(xfr->stream);
if (result == ISC_R_SUCCESS) {
return;
}
xfrout_fail(xfr, result, "sending zone data");
}
static void
xfrout_ctx_destroy(xfrout_ctx_t **xfrp) {
xfrout_ctx_t *xfr = *xfrp;
*xfrp = NULL;
INSIST(xfr->sends == 0);
isc_nm_timer_stop(xfr->delayed_send_timer);
isc_nm_timer_detach(&xfr->delayed_send_timer);
isc_nm_timer_stop(xfr->maxtime_timer);
isc_nm_timer_detach(&xfr->maxtime_timer);
if (xfr->stream != NULL) {
xfr->stream->methods->destroy(&xfr->stream);
}
if (xfr->buf.base != NULL) {
isc_mem_put(xfr->mctx, xfr->buf.base, xfr->buf.length);
}
if (xfr->txmem != NULL) {
isc_mem_put(xfr->mctx, xfr->txmem, xfr->txmemlen);
}
if (xfr->lasttsig != NULL) {
isc_buffer_free(&xfr->lasttsig);
}
isc_quota_release(&xfr->client->manager->sctx->xfroutquota);
if (xfr->ver != NULL) {
dns_db_closeversion(xfr->db, &xfr->ver, false);
}
if (xfr->zone != NULL) {
dns_zone_detach(&xfr->zone);
}
if (xfr->db != NULL) {
dns_db_detach(&xfr->db);
}
isc_mem_putanddetach(&xfr->mctx, xfr, sizeof(*xfr));
}
static void
xfrout_senddone(isc_nmhandle_t *handle, isc_result_t result, void *arg) {
xfrout_ctx_t *xfr = (xfrout_ctx_t *)arg;
REQUIRE((xfr->client->attributes & NS_CLIENTATTR_TCP) != 0);
INSIST(handle == xfr->client->handle);
xfr->sends--;
INSIST(xfr->sends == 0);
isc_nmhandle_detach(&xfr->client->sendhandle);
/*
* Update transfer statistics if sending succeeded, accounting for the
* two-byte TCP length prefix included in the number of bytes sent.
*/
if (result == ISC_R_SUCCESS) {
xfr->stats.nmsg++;
xfr->stats.nbytes += xfr->cbytes;
}
if (xfr->shuttingdown) {
xfrout_maybe_destroy(xfr);
} else if (result != ISC_R_SUCCESS) {
xfrout_fail(xfr, result, "send");
} else if (!xfr->end_of_stream) {
sendstream(xfr);
} else {
/* End of zone transfer stream. */
uint64_t msecs, persec;
inc_stats(xfr->client, xfr->zone, ns_statscounter_xfrdone);
xfr->stats.end = isc_time_now();
msecs = isc_time_microdiff(&xfr->stats.end, &xfr->stats.start);
msecs /= 1000;
if (msecs == 0) {
msecs = 1;
}
persec = (xfr->stats.nbytes * 1000) / msecs;
xfrout_log(xfr, xfr->poll ? ISC_LOG_DEBUG(1) : ISC_LOG_INFO,
"%s ended: "
"%" PRIu64 " messages, %" PRIu64 " records, "
"%" PRIu64 " bytes, "
"%u.%03u secs (%u bytes/sec) (serial %u)",
xfr->mnemonic, xfr->stats.nmsg, xfr->stats.nrecs,
xfr->stats.nbytes, (unsigned int)(msecs / 1000),
(unsigned int)(msecs % 1000), (unsigned int)persec,
xfr->end_serial);
/*
* We're done, unreference the handle and destroy the xfr
* context.
*/
isc_nmhandle_detach(&xfr->client->reqhandle);
xfrout_ctx_destroy(&xfr);
}
}
static void
xfrout_fail(xfrout_ctx_t *xfr, isc_result_t result, const char *msg) {
xfr->shuttingdown = true;
xfrout_log(xfr, ISC_LOG_ERROR, "%s: %s", msg,
isc_result_totext(result));
xfrout_maybe_destroy(xfr);
}
static void
xfrout_maybe_destroy(xfrout_ctx_t *xfr) {
REQUIRE(xfr->shuttingdown);
ns_client_drop(xfr->client, ISC_R_CANCELED);
isc_nmhandle_detach(&xfr->client->reqhandle);
xfrout_ctx_destroy(&xfr);
}
static void
xfrout_client_timeout(void *arg, isc_result_t result) {
xfrout_ctx_t *xfr = (xfrout_ctx_t *)arg;
xfr->shuttingdown = true;
xfrout_log(xfr, ISC_LOG_ERROR, "%s: %s", "aborted",
isc_result_totext(result));
}
/*
* Log outgoing zone transfer messages in a format like
* <client>: transfer of <zone>: <message>
*/
static void
xfrout_logv(ns_client_t *client, dns_name_t *zonename, dns_rdataclass_t rdclass,
int level, const char *fmt, va_list ap) ISC_FORMAT_PRINTF(5, 0);
static void
xfrout_logv(ns_client_t *client, dns_name_t *zonename, dns_rdataclass_t rdclass,
int level, const char *fmt, va_list ap) {
char msgbuf[2048];
char namebuf[DNS_NAME_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
dns_name_format(zonename, namebuf, sizeof(namebuf));
dns_rdataclass_format(rdclass, classbuf, sizeof(classbuf));
vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
ns_client_log(client, DNS_LOGCATEGORY_XFER_OUT, NS_LOGMODULE_XFER_OUT,
level, "transfer of '%s/%s': %s", namebuf, classbuf,
msgbuf);
}
/*
* Logging function for use when a xfrout_ctx_t has not yet been created.
*/
static void
xfrout_log1(ns_client_t *client, dns_name_t *zonename, dns_rdataclass_t rdclass,
int level, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
xfrout_logv(client, zonename, rdclass, level, fmt, ap);
va_end(ap);
}
/*
* Logging function for use when there is a xfrout_ctx_t.
*/
static void
xfrout_log(xfrout_ctx_t *xfr, int level, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
xfrout_logv(xfr->client, xfr->qname, xfr->qclass, level, fmt, ap);
va_end(ap);
}
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