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bind/lib/dns/zone.c

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/*
* Copyright (C) 1999, 2000 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/* $Id: zone.c,v 1.134 2000/06/01 00:30:54 explorer Exp $ */
#include <config.h>
#include <isc/file.h>
#include <isc/print.h>
#include <isc/ratelimiter.h>
#include <isc/serial.h>
#include <isc/string.h>
#include <isc/taskpool.h>
#include <isc/timer.h>
#include <isc/util.h>
#include <dns/acl.h>
#include <dns/adb.h>
#include <dns/db.h>
#include <dns/events.h>
#include <dns/journal.h>
#include <dns/log.h>
#include <dns/masterdump.h>
#include <dns/message.h>
#include <dns/peer.h>
#include <dns/rcode.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatastruct.h>
#include <dns/request.h>
#include <dns/resolver.h>
#include <dns/result.h>
#include <dns/ssu.h>
#include <dns/tsig.h>
#include <dns/xfrin.h>
#include <dns/zone.h>
#define ZONE_MAGIC 0x5a4f4e45U /* ZONE */
#define NOTIFY_MAGIC 0x4e746679U /* Ntfy */
#define DNS_ZONE_VALID(zone) \
ISC_MAGIC_VALID(zone, ZONE_MAGIC)
#define DNS_NOTIFY_VALID(notify) \
ISC_MAGIC_VALID(notify, NOTIFY_MAGIC)
#define RANGE(a, b, c) (((a) < (b)) ? (b) : ((a) < (c) ? (a) : (c)))
/*
* Implementation limits.
*/
#define DNS_MIN_REFRESH 2 /* 2 seconds */
#define DNS_MAX_REFRESH 2419200 /* 4 weeks */
#define DNS_MIN_RETRY 1 /* 1 second */
#define DNS_MAX_RETRY 1209600 /* 2 weeks */
#define DNS_MAX_EXPIRE 14515200 /* 24 weeks */
/*
* Default values.
*/
#define DNS_DEFAULT_IDLEIN 3600 /* 1 hour */
#define DNS_DEFAULT_IDLEOUT 3600 /* 1 hour */
#define DEFAULT_REFRESH 900 /* 15 minutes */
#define DEFAULT_RETRY 300 /* 5 minutes */
#define MAX_XFER_TIME (2*3600) /* Documented default is 2 hours */
typedef struct notify notify_t;
struct dns_zone {
/* Unlocked */
unsigned int magic;
isc_mutex_t lock;
isc_mem_t *mctx;
/* Locked */
dns_db_t *db;
dns_zonemgr_t *zmgr;
ISC_LINK(dns_zone_t) link; /* Used by zmgr. */
isc_timer_t *timer;
unsigned int erefs;
unsigned int irefs;
dns_name_t origin;
char *dbname;
char *journal;
isc_int32_t journalsize;
dns_rdataclass_t rdclass;
dns_zonetype_t type;
unsigned int flags;
unsigned int options;
char *db_type;
unsigned int db_argc;
char **db_argv;
isc_stdtime_t expiretime;
isc_stdtime_t refreshtime;
isc_stdtime_t dumptime;
isc_time_t loadtime;
isc_uint32_t serial;
isc_uint32_t refresh;
isc_uint32_t retry;
isc_uint32_t expire;
isc_uint32_t minimum;
isc_sockaddr_t *masters;
unsigned int masterscnt;
unsigned int curmaster;
isc_sockaddr_t masteraddr;
isc_sockaddr_t *notify;
unsigned int notifycnt;
isc_sockaddr_t notifyfrom;
isc_task_t *task;
isc_sockaddr_t xfrsource4;
isc_sockaddr_t xfrsource6;
dns_xfrin_ctx_t *xfr;
/* Access Control Lists */
dns_acl_t *update_acl;
dns_acl_t *query_acl;
dns_acl_t *xfr_acl;
dns_severity_t check_names;
ISC_LIST(notify_t) notifies;
dns_request_t *request;
isc_uint32_t maxxfrin;
isc_uint32_t maxxfrout;
isc_uint32_t idlein;
isc_uint32_t idleout;
isc_boolean_t diff_on_reload;
isc_event_t ctlevent;
dns_ssutable_t *ssutable;
dns_view_t *view;
/*
* Zones in certain states such as "waiting for zone transfer"
* or "zone transfer in progress" are kept on per-state linked lists
* in the zone manager using the 'statelink' field. The 'statelist'
* field points at the list the zone is currently on. It the zone
* is not on any such list, statelist is NULL.
*/
ISC_LINK(dns_zone_t) statelink;
dns_zonelist_t *statelist;
};
#define DNS_ZONE_FLAG(z,f) (((z)->flags & (f)) != 0)
/* XXX MPA these may need to go back into zone.h */
#define DNS_ZONE_F_REFRESH 0x00000001U /* refresh check in progress */
#define DNS_ZONE_F_NEEDDUMP 0x00000002U /* zone need consolidation */
/* #define DNS_ZONE_F_UNUSED 0x00000004U */ /* unused */
/* #define DNS_ZONE_F_UNUSED 0x00000008U */ /* unused */
/* #define DNS_ZONE_F_UNUSED 0x00000010U */ /* unused */
#define DNS_ZONE_F_LOADED 0x00000020U /* database has loaded */
#define DNS_ZONE_F_EXITING 0x00000040U /* zone is being destroyed */
#define DNS_ZONE_F_EXPIRED 0x00000080U /* zone has expired */
#define DNS_ZONE_F_NEEDREFRESH 0x00000100U /* refresh check needed */
#define DNS_ZONE_F_UPTODATE 0x00000200U /* zone contents are
* uptodate */
#define DNS_ZONE_F_NEEDNOTIFY 0x00000400U /* need to send out notify
* messages */
#define DNS_ZONE_F_DIFFONRELOAD 0x00000800U /* generate a journal diff on
* reload */
#define DNS_ZONE_F_NOMASTERS 0x00001000U /* an attempt to refresh a
* zone with no masters
* occured */
#define DNS_ZONE_OPTION(z,o) (((z)->options & (o)) != 0)
struct dns_zonemgr {
isc_mem_t * mctx;
int refs;
isc_taskmgr_t * taskmgr;
isc_timermgr_t * timermgr;
isc_socketmgr_t * socketmgr;
isc_taskpool_t * zonetasks;
isc_task_t * task;
isc_ratelimiter_t * rl;
isc_rwlock_t rwlock;
isc_rwlock_t conflock;
/* Locked by rwlock. */
dns_zonelist_t zones;
dns_zonelist_t waiting_for_xfrin;
dns_zonelist_t xfrin_in_progress;
/* Locked by conflock. */
int transfersin;
int transfersperns;
};
/*
* Hold notify state.
*/
struct notify {
isc_int32_t magic;
isc_mem_t *mctx;
dns_zone_t *zone;
dns_adbfind_t *find;
dns_request_t *request;
dns_name_t ns;
isc_sockaddr_t dst;
ISC_LINK(notify_t) link;
};
static isc_result_t zone_settimer(dns_zone_t *, isc_stdtime_t);
static void cancel_refresh(dns_zone_t *);
static void zone_log(dns_zone_t *zone, const char *, int, const char *msg,
...);
static void queue_xfrin(dns_zone_t *zone);
static isc_result_t dns_zone_tostr(dns_zone_t *zone, isc_mem_t *mctx,
char **s);
static void zone_unload(dns_zone_t *zone);
static void zone_expire(dns_zone_t *zone);
static isc_result_t zone_replacedb(dns_zone_t *zone, dns_db_t *db,
isc_boolean_t dump);
static isc_result_t default_journal(dns_zone_t *zone);
static void zone_xfrdone(dns_zone_t *zone, isc_result_t result);
static void zone_shutdown(isc_task_t *, isc_event_t *);
#if 0
/* ondestroy example */
static void dns_zonemgr_dbdestroyed(isc_task_t *task, isc_event_t *event);
#endif
static void refresh_callback(isc_task_t *, isc_event_t *);
static void queue_soa_query(dns_zone_t *zone);
static void soa_query(isc_task_t *, isc_event_t *);
static int message_count(dns_message_t *msg, dns_section_t section,
dns_rdatatype_t type);
static void notify_find_address(notify_t *notify);
static void notify_send(notify_t *notify);
static isc_result_t notify_createmessage(dns_zone_t *zone,
dns_message_t **messagep);
static void notify_done(isc_task_t *task, isc_event_t *event);
static void notify_send_toaddr(isc_task_t *task, isc_event_t *event);
static isc_result_t zone_dump(dns_zone_t *);
static void got_transfer_quota(isc_task_t *task, isc_event_t *event);
static isc_result_t zmgr_start_xfrin_ifquota(dns_zonemgr_t *zmgr,
dns_zone_t *zone);
static void zmgr_resume_xfrs(dns_zonemgr_t *zmgr);
static void zonemgr_free(dns_zonemgr_t *zmgr);
static isc_result_t
zone_get_from_db(dns_db_t *db, dns_name_t *origin, unsigned int *nscount,
unsigned int *soacount, isc_uint32_t *serial,
isc_uint32_t *refresh, isc_uint32_t *retry,
isc_uint32_t *expire, isc_uint32_t *minimum);
#define PRINT_ZONE_REF(zone) \
do { \
char *s = NULL; \
isc_result_t r; \
r = dns_zone_tostr(zone, zone->mctx, &s); \
if (r == ISC_R_SUCCESS) { \
printf("%p: %s: erefs=%d irefs=%d\n", zone, s, \
zone->erefs, zone->irefs); \
isc_mem_free(zone->mctx, s); \
} \
} while (0)
#define ZONE_LOG(x,y) zone_log(zone, me, ISC_LOG_DEBUG(x), y)
#define DNS_ENTER zone_log(zone, me, ISC_LOG_DEBUG(1), "enter")
#define DNS_LEAVE zone_log(zone, me, ISC_LOG_DEBUG(1), "leave")
/***
*** Public functions.
***/
isc_result_t
dns_zone_create(dns_zone_t **zonep, isc_mem_t *mctx) {
isc_result_t result;
dns_zone_t *zone;
REQUIRE(zonep != NULL && *zonep == NULL);
REQUIRE(mctx != NULL);
zone = isc_mem_get(mctx, sizeof *zone);
if (zone == NULL)
return (ISC_R_NOMEMORY);
result = isc_mutex_init(&zone->lock);
if (result != ISC_R_SUCCESS) {
isc_mem_put(mctx, zone, sizeof *zone);
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_mutex_init() failed: %s",
isc_result_totext(result));
return (ISC_R_UNEXPECTED);
}
/* XXX MPA check that all elements are initialised */
zone->mctx = NULL;
isc_mem_attach(mctx, &zone->mctx);
zone->db = NULL;
zone->zmgr = NULL;
ISC_LINK_INIT(zone, link);
zone->erefs = 1; /* Implicit attach. */
zone->irefs = 0;
dns_name_init(&zone->origin, NULL);
zone->dbname = NULL;
zone->journalsize = -1;
zone->journal = NULL;
zone->rdclass = dns_rdataclass_none;
zone->type = dns_zone_none;
zone->flags = 0;
zone->options = 0;
zone->db_type = NULL;
zone->db_argc = 0;
zone->db_argv = NULL;
zone->expiretime = 0;
zone->refreshtime = 0;
zone->dumptime = 0;
isc_time_settoepoch(&zone->loadtime);
zone->serial = 0;
zone->refresh = DEFAULT_REFRESH;
zone->retry = DEFAULT_RETRY;
zone->expire = 0;
zone->minimum = 0;
zone->masters = NULL;
zone->masterscnt = 0;
zone->curmaster = 0;
zone->notify = NULL;
zone->notifycnt = 0;
zone->task = NULL;
zone->update_acl = NULL;
zone->query_acl = NULL;
zone->xfr_acl = NULL;
zone->check_names = dns_severity_ignore;
zone->request = NULL;
zone->timer = NULL;
zone->idlein = DNS_DEFAULT_IDLEIN;
zone->idleout = DNS_DEFAULT_IDLEOUT;
ISC_LIST_INIT(zone->notifies);
isc_sockaddr_any(&zone->xfrsource4);
isc_sockaddr_any6(&zone->xfrsource6);
zone->xfr = NULL;
zone->maxxfrin = MAX_XFER_TIME;
zone->maxxfrout = MAX_XFER_TIME;
zone->diff_on_reload = ISC_FALSE;
zone->ssutable = NULL;
zone->view = NULL;
ISC_LINK_INIT(zone, statelink);
zone->statelist = NULL;
zone->magic = ZONE_MAGIC;
ISC_EVENT_INIT(&zone->ctlevent, sizeof(zone->ctlevent), 0, NULL,
DNS_EVENT_ZONECONTROL, zone_shutdown, zone, zone,
NULL, NULL);
*zonep = zone;
return (ISC_R_SUCCESS);
}
/*
* Free a zone. Because we require that there be no more
* outstanding events or references, no locking is necessary.
*/
static void
zone_free(dns_zone_t *zone) {
isc_mem_t *mctx = NULL;
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(zone->erefs == 0);
REQUIRE(zone->irefs == 0);
/*
* Managed objects. Order is important.
*/
if (zone->timer != NULL)
isc_timer_detach(&zone->timer);
if (zone->request != NULL)
dns_request_destroy(&zone->request); /* XXXMPA */
INSIST(zone->statelist == NULL);
if (zone->task != NULL)
isc_task_detach(&zone->task);
if (zone->zmgr)
dns_zonemgr_releasezone(zone->zmgr, zone);
/* Unmanaged objects */
if (zone->dbname != NULL)
isc_mem_free(zone->mctx, zone->dbname);
zone->dbname = NULL;
zone->journalsize = -1;
if (zone->journal != NULL)
isc_mem_free(zone->mctx, zone->journal);
zone->journal = NULL;
if (zone->db_type != NULL)
isc_mem_free(zone->mctx, zone->db_type);
zone->db_type = NULL;
if (zone->db != NULL)
dns_db_detach(&zone->db);
dns_zone_cleardbargs(zone);
dns_zone_setmasters(zone, NULL, 0);
dns_zone_setalsonotify(zone, NULL, 0);
zone->check_names = dns_severity_ignore;
if (zone->update_acl != NULL)
dns_acl_detach(&zone->update_acl);
if (zone->query_acl != NULL)
dns_acl_detach(&zone->query_acl);
if (zone->xfr_acl != NULL)
dns_acl_detach(&zone->xfr_acl);
if (dns_name_dynamic(&zone->origin))
dns_name_free(&zone->origin, zone->mctx);
if (zone->ssutable != NULL)
dns_ssutable_detach(&zone->ssutable);
/* last stuff */
isc_mutex_destroy(&zone->lock);
zone->magic = 0;
mctx = zone->mctx;
isc_mem_put(mctx, zone, sizeof *zone);
isc_mem_detach(&mctx);
}
/*
* Single shot.
*/
void
dns_zone_setclass(dns_zone_t *zone, dns_rdataclass_t rdclass) {
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(rdclass != dns_rdataclass_none);
/*
* Test and set.
*/
LOCK(&zone->lock);
REQUIRE(zone->rdclass == dns_rdataclass_none ||
zone->rdclass == rdclass);
zone->rdclass = rdclass;
UNLOCK(&zone->lock);
}
dns_rdataclass_t
dns_zone_getclass(dns_zone_t *zone){
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->rdclass);
}
/*
* Single shot.
*/
void
dns_zone_settype(dns_zone_t *zone, dns_zonetype_t type) {
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(type != dns_zone_none);
/*
* Test and set.
*/
LOCK(&zone->lock);
REQUIRE(zone->type == dns_zone_none || zone->type == type);
zone->type = type;
UNLOCK(&zone->lock);
}
isc_result_t
dns_zone_setdbtype(dns_zone_t *zone, char *db_type) {
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->db_type != NULL)
isc_mem_free(zone->mctx, zone->db_type);
zone->db_type = isc_mem_strdup(zone->mctx, db_type);
if (zone->db_type == NULL)
result = ISC_R_NOMEMORY;
UNLOCK(&zone->lock);
return (result);
}
void
dns_zone_setview(dns_zone_t *zone, dns_view_t *view) {
if (zone->view != NULL)
dns_view_weakdetach(&zone->view);
dns_view_weakattach(view, &zone->view);
}
dns_view_t *
dns_zone_getview(dns_zone_t *zone) {
return (zone->view);
}
isc_result_t
dns_zone_setorigin(dns_zone_t *zone, dns_name_t *origin) {
isc_result_t result;
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(origin != NULL);
LOCK(&zone->lock);
if (dns_name_dynamic(&zone->origin)) {
dns_name_free(&zone->origin, zone->mctx);
dns_name_init(&zone->origin, NULL);
}
result = dns_name_dup(origin, zone->mctx, &zone->origin);
UNLOCK(&zone->lock);
return (result);
}
isc_result_t
dns_zone_setdatabase(dns_zone_t *zone, const char *dbname) {
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(dbname != NULL);
LOCK(&zone->lock);
if (zone->dbname != NULL)
isc_mem_free(zone->mctx, zone->dbname);
zone->dbname = isc_mem_strdup(zone->mctx, dbname);
if (zone->dbname == NULL)
result = ISC_R_NOMEMORY;
else
result = default_journal(zone);
UNLOCK(&zone->lock);
return (result);
}
static isc_result_t
default_journal(dns_zone_t *zone) {
int len;
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(zone->dbname != NULL);
if (zone->journal != NULL)
isc_mem_free(zone->mctx, zone->journal);
len = strlen(zone->dbname) + sizeof ".jnl"; /* includes '\0' */
zone->journal = isc_mem_allocate(zone->mctx, len);
if (zone->journal == NULL)
return (ISC_R_NOMEMORY);
strcpy(zone->journal, zone->dbname);
strcat(zone->journal, ".jnl");
return (ISC_R_SUCCESS);
}
isc_result_t
dns_zone_setjournal(dns_zone_t *zone, const char *journal) {
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(journal != NULL);
LOCK(&zone->lock);
if (zone->journal != NULL)
isc_mem_free(zone->mctx, zone->journal);
zone->journal = isc_mem_strdup(zone->mctx, journal);
if (zone->journal == NULL)
result = ISC_R_NOMEMORY;
UNLOCK(&zone->lock);
return (result);
}
char *
dns_zone_getjournal(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->journal);
}
isc_result_t
dns_zone_load(dns_zone_t *zone) {
const char me[] = "dns_zone_load";
unsigned int soacount = 0;
unsigned int nscount = 0;
isc_uint32_t serial, refresh, retry, expire, minimum;
isc_result_t result;
isc_stdtime_t now;
isc_time_t loadtime, filetime;
dns_db_t *db = NULL;
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
isc_stdtime_get(&now);
switch (zone->type) {
case dns_zone_none:
result = ISC_R_SUCCESS;
goto cleanup;
case dns_zone_master:
case dns_zone_slave:
case dns_zone_stub:
break;
default:
INSIST("bad zone type" == NULL);
}
REQUIRE(zone->dbname != NULL);
zone_log(zone, me, ISC_LOG_DEBUG(1), "start");
/*
* Don't do the load if the file that stores the zone is older
* than the last time the zone was loaded. If the zone has not
* been loaded yet, zone->loadtime will be the epoch.
*/
result = isc_file_getmodtime(zone->dbname, &filetime);
if (result == ISC_R_SUCCESS && ! isc_time_isepoch(&zone->loadtime) &&
isc_time_compare(&filetime, &zone->loadtime) < 0) {
zone_log(zone, me, ISC_LOG_DEBUG(1),
"skipping: database file older than last load");
result = ISC_R_SUCCESS;
goto cleanup;
}
/*
* Store the current time before the zone is loaded, so that if the
* file changes between the time of the load and the time that
* zone->loadtime is set, then the file will still be reloaded
* the next time dns_zone_load is called.
*/
result = isc_time_now(&loadtime);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_db_create(zone->mctx, zone->db_type,
&zone->origin,
ISC_FALSE, zone->rdclass,
zone->db_argc, zone->db_argv, &db);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_db_load(db, zone->dbname);
/*
* Initiate zone transfer? We may need a error code that
* indicates that the "permanent" form does not exist.
* XXX better error feedback to log.
*/
if (result != ISC_R_SUCCESS) {
if (zone->type == dns_zone_slave) {
zone_log(zone, me, ISC_LOG_INFO,
"no database file");
/* Mark the zone for immediate refresh. */
zone->refreshtime = now;
result = ISC_R_SUCCESS;
} else {
zone_log(zone, me, ISC_LOG_ERROR,
"database %s: dns_db_load failed: %s",
zone->dbname, dns_result_totext(result));
}
goto cleanup;
}
zone->loadtime = loadtime;
zone_log(zone, me, ISC_LOG_DEBUG(1), "loaded");
/*
* Apply update log, if any.
*/
if (zone->journal != NULL) {
result = dns_journal_rollforward(zone->mctx, db,
zone->journal);
if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND &&
result != DNS_R_UPTODATE && result != DNS_R_NOJOURNAL)
goto cleanup;
if (result == ISC_R_NOTFOUND) {
zone_log(zone, me, ISC_LOG_ERROR,
"journal out of sync with zone");
goto cleanup;
}
zone_log(zone, me, ISC_LOG_DEBUG(1),
"dns_journal_rollforward: %s",
dns_result_totext(result));
if (result == ISC_R_SUCCESS)
zone->flags |= DNS_ZONE_F_NEEDDUMP;
}
/*
* Obtain ns and soa counts for top of zone.
*/
nscount = 0;
soacount = 0;
INSIST(db != NULL);
result = zone_get_from_db(db, &zone->origin, &nscount,
&soacount, &serial, &refresh, &retry,
&expire, &minimum);
if (result != ISC_R_SUCCESS) {
zone_log(zone, me, ISC_LOG_ERROR,
"could not find NS and/or SOA records");
}
/*
* Master / Slave / Stub zones require both NS and SOA records at
* the top of the zone.
*/
switch (zone->type) {
case dns_zone_master:
case dns_zone_slave:
case dns_zone_stub:
if (soacount != 1 || nscount == 0) {
if (soacount != 1)
zone_log(zone, me, ISC_LOG_ERROR,
"has %d SOA record%s", soacount,
(soacount != 0) ? "s" : "");
if (nscount == 0)
zone_log(zone, me, ISC_LOG_ERROR,
"no NS records");
result = DNS_R_BADZONE;
goto cleanup;
}
if (zone->db != NULL) {
if (!isc_serial_ge(serial, zone->serial)) {
zone_log(zone, me, ISC_LOG_ERROR,
"zone serial has gone backwards");
}
}
zone->serial = serial;
zone->refresh = RANGE(refresh, DNS_MIN_REFRESH,
DNS_MAX_REFRESH);
zone->retry = RANGE(retry, DNS_MIN_REFRESH, DNS_MAX_REFRESH);
zone->expire = RANGE(expire, zone->refresh + zone->retry,
DNS_MAX_EXPIRE);
zone->minimum = minimum;
if (zone->type == dns_zone_slave ||
zone->type == dns_zone_stub) {
isc_time_t t;
result = isc_file_getmodtime(zone->dbname, &t);
if (result == ISC_R_SUCCESS)
zone->expiretime = isc_time_seconds(&t) +
zone->expire;
else
zone->expiretime = now + zone->retry;
zone->refreshtime = now;
}
break;
default:
UNEXPECTED_ERROR(__FILE__, __LINE__,
"unexpected zone type %d", zone->type);
result = ISC_R_UNEXPECTED;
goto cleanup;
}
#if 0
/* destroy notification example. */
{
isc_event_t *e = isc_event_allocate(zone->mctx, NULL,
DNS_EVENT_DBDESTROYED,
dns_zonemgr_dbdestroyed,
zone,
sizeof(isc_event_t));
dns_db_ondestroy(db, zone->task, &e);
}
#endif
if (zone->db != NULL) {
result = zone_replacedb(zone, db, ISC_FALSE);
if (result != ISC_R_SUCCESS)
goto cleanup;
} else {
dns_db_attach(db, &zone->db);
zone->flags |= DNS_ZONE_F_LOADED|DNS_ZONE_F_NEEDNOTIFY;
}
result = ISC_R_SUCCESS;
cleanup:
UNLOCK(&zone->lock);
if (db != NULL)
dns_db_detach(&db);
return (result);
}
static void
exit_check(dns_zone_t *zone) {
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING) &&
zone->irefs == 0)
{
/*
* DNS_ZONE_F_EXITING can only be set if erefs == 0.
*/
INSIST(zone->erefs == 0);
zone_free(zone);
}
}
static isc_result_t
zone_count_ns_rr(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
unsigned int *nscount)
{
isc_result_t result;
unsigned int count;
dns_rdataset_t rdataset;
REQUIRE(nscount != NULL);
dns_rdataset_init(&rdataset);
result = dns_db_findrdataset(db, node, version, dns_rdatatype_ns,
dns_rdatatype_none, 0, &rdataset, NULL);
if (result != ISC_R_SUCCESS)
goto invalidate_rdataset;
count = 0;
result = dns_rdataset_first(&rdataset);
while (result == ISC_R_SUCCESS) {
count++;
result = dns_rdataset_next(&rdataset);
}
dns_rdataset_disassociate(&rdataset);
*nscount = count;
result = ISC_R_SUCCESS;
invalidate_rdataset:
dns_rdataset_invalidate(&rdataset);
return (result);
}
static isc_result_t
zone_load_soa_rr(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
unsigned int *soacount,
isc_uint32_t *serial, isc_uint32_t *refresh,
isc_uint32_t *retry, isc_uint32_t *expire,
isc_uint32_t *minimum)
{
isc_result_t result;
unsigned int count;
dns_rdataset_t rdataset;
dns_rdata_t rdata;
dns_rdata_soa_t soa;
dns_rdataset_init(&rdataset);
result = dns_db_findrdataset(db, node, version, dns_rdatatype_soa,
dns_rdatatype_none, 0, &rdataset, NULL);
if (result != ISC_R_SUCCESS)
goto invalidate_rdataset;
count = 0;
result = dns_rdataset_first(&rdataset);
while (result == ISC_R_SUCCESS) {
dns_rdataset_current(&rdataset, &rdata);
count++;
if (count == 1)
dns_rdata_tostruct(&rdata, &soa, NULL);
result = dns_rdataset_next(&rdataset);
}
dns_rdataset_disassociate(&rdataset);
if (soacount != NULL)
*soacount = count;
if (count > 0) {
if (serial != NULL)
*serial = soa.serial;
if (refresh != NULL)
*refresh = soa.refresh;
if (retry != NULL)
*retry = soa.retry;
if (expire != NULL)
*expire = soa.expire;
if (minimum != NULL)
*minimum = soa.minimum;
}
result = ISC_R_SUCCESS;
invalidate_rdataset:
dns_rdataset_invalidate(&rdataset);
return (result);
}
/*
* zone must be locked.
*/
static isc_result_t
zone_get_from_db(dns_db_t *db, dns_name_t *origin, unsigned int *nscount,
unsigned int *soacount, isc_uint32_t *serial,
isc_uint32_t *refresh, isc_uint32_t *retry,
isc_uint32_t *expire, isc_uint32_t *minimum)
{
dns_dbversion_t *version = NULL;
isc_result_t result;
dns_dbnode_t *node;
REQUIRE(db != NULL);
REQUIRE(origin != NULL);
version = NULL;
dns_db_currentversion(db, &version);
node = NULL;
result = dns_db_findnode(db, origin, ISC_FALSE, &node);
if (result != ISC_R_SUCCESS)
goto closeversion;
if (nscount != NULL) {
result = zone_count_ns_rr(db, node, version, nscount);
if (result != ISC_R_SUCCESS)
goto detachnode;
}
if (soacount != NULL || serial != NULL || refresh != NULL
|| retry != NULL || expire != NULL || minimum != NULL) {
result = zone_load_soa_rr(db, node, version, soacount,
serial, refresh, retry, expire,
minimum);
if (result != ISC_R_SUCCESS)
goto detachnode;
}
detachnode:
dns_db_detachnode(db, &node);
closeversion:
dns_db_closeversion(db, &version, ISC_FALSE);
return (result);
}
void
dns_zone_attach(dns_zone_t *source, dns_zone_t **target) {
REQUIRE(DNS_ZONE_VALID(source));
REQUIRE(target != NULL && *target == NULL);
LOCK(&source->lock);
REQUIRE(source->erefs > 0);
source->erefs++;
INSIST(source->erefs != 0);
UNLOCK(&source->lock);
*target = source;
}
void
dns_zone_detach(dns_zone_t **zonep) {
dns_zone_t *zone;
isc_boolean_t free_now = ISC_FALSE;
REQUIRE(zonep != NULL && DNS_ZONE_VALID(*zonep));
zone = *zonep;
LOCK(&zone->lock);
REQUIRE(zone->erefs > 0);
zone->erefs--;
if (zone->erefs == 0) {
/*
* We just detached the last external reference.
*/
if (zone->task != NULL) {
/*
* This zone is being managed. Post
* its control event and let it clean
* up synchronously in the context of
* its task.
*/
isc_event_t *ev = &zone->ctlevent;
isc_task_send(zone->task, &ev);
} else {
/*
* This zone is not being managed; it has
* no task and can have no outstanding
* events. Free it immediately.
*/
/*
* Unmanaged zones should not have non-null views;
* we have no way of detaching from the view here
* without causing deadlock because this code is called
* with the view already locked.
*/
INSIST(zone->view == NULL);
free_now = ISC_TRUE;
}
}
UNLOCK(&zone->lock);
*zonep = NULL;
if (free_now)
zone_free(zone);
}
void
dns_zone_iattach(dns_zone_t *source, dns_zone_t **target) {
REQUIRE(DNS_ZONE_VALID(source));
REQUIRE(target != NULL && *target == NULL);
source->irefs++;
INSIST(source->irefs != 0);
*target = source;
}
void
dns_zone_idetach(dns_zone_t **zonep) {
dns_zone_t *zone;
REQUIRE(zonep != NULL && DNS_ZONE_VALID(*zonep));
zone = *zonep;
REQUIRE(zone->irefs > 0);
zone->irefs--;
*zonep = NULL;
exit_check(zone);
}
void
dns_zone_print(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
PRINT_ZONE_REF(zone);
}
isc_mem_t *
dns_zone_getmctx(dns_zone_t *zone) {
return (zone->mctx);
}
dns_zonemgr_t *
dns_zone_getmgr(dns_zone_t *zone) {
return (zone->zmgr);
}
static isc_result_t
dns_zone_tostr(dns_zone_t *zone, isc_mem_t *mctx, char **s) {
isc_buffer_t tbuf;
char outbuf[1024];
isc_result_t result;
REQUIRE(s != NULL && *s == NULL);
REQUIRE(DNS_ZONE_VALID(zone));
isc_buffer_init(&tbuf, outbuf, sizeof(outbuf) - 1);
if (dns_name_countlabels(&zone->origin) > 0) {
result = dns_name_totext(&zone->origin, ISC_FALSE, &tbuf);
if (result == ISC_R_SUCCESS)
outbuf[tbuf.used] = '\0';
else {
strncpy(outbuf, "<name conversion failed>",
sizeof outbuf - 1);
outbuf[sizeof outbuf - 1] = '\0';
}
} else {
strncpy(outbuf, "<unnamed zone>", sizeof outbuf - 1);
outbuf[sizeof outbuf - 1] = '\0';
}
*s = isc_mem_strdup(mctx, outbuf);
return ((*s == NULL) ? ISC_R_NOMEMORY : ISC_R_SUCCESS);
}
void
dns_zone_setflag(dns_zone_t *zone, unsigned int flags, isc_boolean_t value) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (value)
zone->flags |= flags;
else
zone->flags &= ~flags;
UNLOCK(&zone->lock);
}
void
dns_zone_setoption(dns_zone_t *zone, unsigned int option, isc_boolean_t value)
{
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (value)
zone->options |= option;
else
zone->options &= ~option;
UNLOCK(&zone->lock);
}
unsigned int
dns_zone_getoptions(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->options);
}
isc_result_t
dns_zone_adddbarg(dns_zone_t *zone, char *arg) {
char **new = NULL;
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(arg != NULL);
/*
* Allocate new 'db_argv' and set last to be copy of 'arg'.
*/
LOCK(&zone->lock);
new = isc_mem_get(zone->mctx, (zone->db_argc + 1) * sizeof *new);
if (new == NULL)
goto cleanup;
new[zone->db_argc] = isc_mem_strdup(zone->mctx, arg);
if (new[zone->db_argc] == NULL)
goto cleanup;
/*
* Copy old 'db_argv' if required the free it.
*/
if (zone->db_argc != 0) {
memcpy(new, zone->db_argv, zone->db_argc * sizeof *new);
isc_mem_put(zone->mctx, zone->db_argv,
zone->db_argc * sizeof *new);
}
zone->db_argv = new;
zone->db_argc++;
UNLOCK(&zone->lock);
return (ISC_R_SUCCESS);
cleanup:
if (new != NULL)
isc_mem_put(zone->mctx, new,
(zone->db_argc + 1) * sizeof *new);
UNLOCK(&zone->lock);
return (ISC_R_NOMEMORY);
}
void
dns_zone_cleardbargs(dns_zone_t *zone) {
unsigned int i;
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->db_argc) {
for (i = 0 ; i < zone->db_argc; i++)
isc_mem_free(zone->mctx, zone->db_argv[i]);
isc_mem_put(zone->mctx, zone->db_argv,
zone->db_argc * sizeof *zone->db_argv);
zone->db_argc = 0;
zone->db_argv = NULL;
}
UNLOCK(&zone->lock);
}
isc_result_t
dns_zone_setxfrsource4(dns_zone_t *zone, isc_sockaddr_t *xfrsource) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
zone->xfrsource4 = *xfrsource;
UNLOCK(&zone->lock);
return (ISC_R_SUCCESS);
}
isc_sockaddr_t *
dns_zone_getxfrsource4(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (&zone->xfrsource4);
}
isc_result_t
dns_zone_setxfrsource6(dns_zone_t *zone, isc_sockaddr_t *xfrsource) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
zone->xfrsource6 = *xfrsource;
UNLOCK(&zone->lock);
return (ISC_R_SUCCESS);
}
isc_sockaddr_t *
dns_zone_getxfrsource6(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (&zone->xfrsource6);
}
isc_result_t
dns_zone_setalsonotify(dns_zone_t *zone, isc_sockaddr_t *notify,
isc_uint32_t count)
{
isc_sockaddr_t *new;
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE((notify == NULL && count == 0) ||
(notify != NULL && count != 0));
LOCK(&zone->lock);
if (zone->notify != NULL) {
isc_mem_put(zone->mctx, zone->notify,
zone->notifycnt * sizeof *new);
zone->notify = NULL;
zone->notifycnt = 0;
}
if (notify == NULL)
goto unlock;
new = isc_mem_get(zone->mctx, count * sizeof *new);
if (new == NULL) {
UNLOCK(&zone->lock);
return (ISC_R_NOMEMORY);
}
memcpy(new, notify, count * sizeof *new);
zone->notify = new;
zone->notifycnt = count;
unlock:
UNLOCK(&zone->lock);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_zone_setmasters(dns_zone_t *zone, isc_sockaddr_t *masters,
isc_uint32_t count)
{
isc_sockaddr_t *new;
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE((masters == NULL && count == 0) ||
(masters != NULL && count != 0));
LOCK(&zone->lock);
if (zone->masters != NULL) {
isc_mem_put(zone->mctx, zone->masters,
zone->masterscnt * sizeof *new);
zone->masters = NULL;
zone->masterscnt = 0;
}
if (masters == NULL)
goto unlock;
new = isc_mem_get(zone->mctx, count * sizeof *new);
if (new == NULL) {
UNLOCK(&zone->lock);
return (ISC_R_NOMEMORY);
}
memcpy(new, masters, count * sizeof *new);
zone->masters = new;
zone->masterscnt = count;
zone->flags &= ~DNS_ZONE_F_NOMASTERS;
unlock:
UNLOCK(&zone->lock);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_zone_getdb(dns_zone_t *zone, dns_db_t **dpb) {
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->db == NULL)
result = DNS_R_NOTLOADED;
else
dns_db_attach(zone->db, dpb);
UNLOCK(&zone->lock);
return (result);
}
/*
* Co-ordinates the starting of routine jobs.
*/
void
dns_zone_maintenance(dns_zone_t *zone) {
const char me[] = "dns_zone_maintenance";
isc_stdtime_t now;
isc_result_t result;
REQUIRE(DNS_ZONE_VALID(zone));
DNS_ENTER;
isc_stdtime_get(&now);
/*
* Expire check.
*/
switch (zone->type) {
case dns_zone_slave:
case dns_zone_stub:
LOCK(&zone->lock);
if (now >= zone->expiretime &&
DNS_ZONE_FLAG(zone, DNS_ZONE_F_LOADED)) {
zone_expire(zone);
zone->refreshtime = now;
}
UNLOCK(&zone->lock);
break;
default:
break;
}
/*
* Up to date check.
*/
switch (zone->type) {
case dns_zone_slave:
case dns_zone_stub:
if (now >= zone->refreshtime)
dns_zone_refresh(zone);
break;
default:
break;
}
/*
* Do we need to consolidate the backing store?
*/
switch (zone->type) {
case dns_zone_master:
LOCK(&zone->lock);
if (now >= zone->dumptime &&
DNS_ZONE_FLAG(zone, DNS_ZONE_F_LOADED) &&
DNS_ZONE_FLAG(zone, DNS_ZONE_F_NEEDDUMP)) {
result = zone_dump(zone);
if (result != ISC_R_SUCCESS)
zone_log(zone, "zone_dump", ISC_LOG_WARNING,
"failed: %s",
dns_result_totext(result));
}
UNLOCK(&zone->lock);
break;
default:
break;
}
/*
* Do we need to send out notify messages?
*/
switch (zone->type) {
case dns_zone_master:
case dns_zone_slave:
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_LOADED) &&
DNS_ZONE_FLAG(zone, DNS_ZONE_F_NEEDNOTIFY)) {
dns_zone_notify(zone);
}
default:
break;
}
if (!DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING))
(void) zone_settimer(zone, now);
}
void
dns_zone_expire(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
zone_expire(zone);
UNLOCK(&zone->lock);
}
static void
zone_expire(dns_zone_t *zone) {
isc_result_t result;
/*
* 'zone' locked by caller.
*/
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_NEEDDUMP)) {
result = zone_dump(zone);
if (result != ISC_R_SUCCESS)
zone_log(zone, "zone_dump", ISC_LOG_WARNING,
"failure: %s", dns_result_totext(result));
}
zone->flags |= DNS_ZONE_F_EXPIRED;
dns_zone_setrefresh(zone, DEFAULT_REFRESH, DEFAULT_RETRY);
zone_unload(zone);
}
void
dns_zone_refresh(dns_zone_t *zone) {
isc_stdtime_t now;
isc_uint32_t oldflags;
REQUIRE(DNS_ZONE_VALID(zone));
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING))
return;
isc_stdtime_get(&now);
/*
* Set DNS_ZONE_F_REFRESH so that there is only one refresh operation
* in progress at a time.
*/
LOCK(&zone->lock);
oldflags = zone->flags;
if (zone->masterscnt == 0) {
zone->flags |= DNS_ZONE_F_NOMASTERS;
if ((oldflags & DNS_ZONE_F_NOMASTERS) == 0)
zone_log(zone, "dns_zone_refresh", ISC_LOG_ERROR,
"no masters");
UNLOCK(&zone->lock);
return;
}
zone->flags |= DNS_ZONE_F_REFRESH;
UNLOCK(&zone->lock);
if ((oldflags & DNS_ZONE_F_REFRESH) != 0)
return;
/*
* Set the next refresh time as if refresh check has failed.
* If we are successful it will be reset using zone->refresh.
*/
zone->refreshtime = now + zone->retry;
zone->curmaster = 0;
/* initiate soa query */
queue_soa_query(zone);
}
isc_result_t
dns_zone_dump(dns_zone_t *zone) {
isc_result_t result;
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
result = zone_dump(zone);
UNLOCK(&zone->lock);
return (result);
}
static isc_result_t
zone_dump(dns_zone_t *zone) {
isc_result_t result;
dns_dbversion_t *version = NULL;
dns_db_t *db = NULL;
char *buf;
int buflen;
FILE *f = NULL;
int n;
/*
* 'zone' locked by caller.
*/
REQUIRE(DNS_ZONE_VALID(zone));
buflen = strlen(zone->dbname) + 20;
buf = isc_mem_get(zone->mctx, buflen);
if (buf == NULL)
return (ISC_R_NOMEMORY);
result = isc_file_mktemplate(zone->dbname, buf, buflen);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = isc_file_openunique(buf, &f);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_db_attach(zone->db, &db);
dns_db_currentversion(db, &version);
result = dns_master_dumptostream(zone->mctx, db, version,
&dns_master_style_default, f);
dns_db_closeversion(db, &version, ISC_FALSE);
dns_db_detach(&db);
n = fflush(f);
if (n != 0 && result == ISC_R_SUCCESS)
result = ISC_R_UNEXPECTED;
n = ferror(f);
if (n != 0 && result == ISC_R_SUCCESS)
result = ISC_R_UNEXPECTED;
n = fclose(f);
if (n != 0 && result == ISC_R_SUCCESS)
result = ISC_R_UNEXPECTED;
if (result == ISC_R_SUCCESS) {
n = rename(buf, zone->dbname);
if (n == -1) {
(void)remove(buf);
result = ISC_R_UNEXPECTED;
} else {
zone->flags &= ~DNS_ZONE_F_NEEDDUMP;
}
} else
(void)remove(buf);
cleanup:
isc_mem_put(zone->mctx, buf, buflen);
return (result);
}
isc_result_t
dns_zone_dumptostream(dns_zone_t *zone, FILE *fd) {
isc_result_t result;
dns_dbversion_t *version = NULL;
dns_db_t *db = NULL;
REQUIRE(DNS_ZONE_VALID(zone));
dns_db_attach(zone->db, &db);
dns_db_currentversion(db, &version);
result = dns_master_dumptostream(zone->mctx, db, version,
&dns_master_style_default, fd);
dns_db_closeversion(db, &version, ISC_FALSE);
dns_db_detach(&db);
return (result);
}
void
dns_zone_unload(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
zone_unload(zone);
UNLOCK(&zone->lock);
}
static void
zone_unload(dns_zone_t *zone) {
/* caller to lock */
dns_db_detach(&zone->db);
zone->flags &= ~DNS_ZONE_F_LOADED;
}
void
dns_zone_unmount(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
/*XXX MPA*/
}
void
dns_zone_setrefresh(dns_zone_t *zone, isc_uint32_t refresh,
isc_uint32_t retry)
{
REQUIRE(DNS_ZONE_VALID(zone));
zone->refresh = refresh;
zone->retry = retry;
}
static isc_boolean_t
notify_isqueued(dns_zone_t *zone, dns_name_t *name, isc_sockaddr_t *addr) {
notify_t *notify;
for (notify = ISC_LIST_HEAD(zone->notifies);
notify != NULL;
notify = ISC_LIST_NEXT(notify, link)) {
if (notify->request != NULL)
continue;
if (name != NULL && dns_name_dynamic(&notify->ns) &&
dns_name_equal(name, &notify->ns))
return (ISC_TRUE);
if (addr != NULL && isc_sockaddr_equal(addr, &notify->dst))
return (ISC_TRUE);
}
return (ISC_FALSE);
}
static void
notify_destroy(notify_t *notify) {
isc_mem_t *mctx;
/*
* Caller holds zone lock.
*/
REQUIRE(DNS_NOTIFY_VALID(notify));
if (notify->zone != NULL) {
if (ISC_LINK_LINKED(notify, link))
ISC_LIST_UNLINK(notify->zone->notifies, notify, link);
dns_zone_idetach(&notify->zone);
}
if (notify->find != NULL)
dns_adb_destroyfind(&notify->find);
if (notify->request != NULL)
dns_request_destroy(&notify->request);
if (dns_name_dynamic(&notify->ns))
dns_name_free(&notify->ns, notify->mctx);
mctx = notify->mctx;
isc_mem_put(notify->mctx, notify, sizeof *notify);
isc_mem_detach(&mctx);
}
static isc_result_t
notify_create(isc_mem_t *mctx, notify_t **notifyp) {
notify_t *notify;
REQUIRE(notifyp != NULL && *notifyp == NULL);
notify = isc_mem_get(mctx, sizeof *notify);
if (notify == NULL)
return (ISC_R_NOMEMORY);
notify->mctx = NULL;
isc_mem_attach(mctx, &notify->mctx);
notify->zone = NULL;
notify->find = NULL;
notify->request = NULL;
isc_sockaddr_any(&notify->dst);
dns_name_init(&notify->ns, NULL);
ISC_LINK_INIT(notify, link);
notify->magic = NOTIFY_MAGIC;
*notifyp = notify;
return (ISC_R_SUCCESS);
}
/*
* XXXAG should check for DNS_ZONE_F_EXITING
*/
static void
process_adb_event(isc_task_t *task, isc_event_t *ev) {
notify_t *notify;
isc_eventtype_t result;
dns_zone_t *zone = NULL;
UNUSED(task);
notify = ev->ev_arg;
REQUIRE(DNS_NOTIFY_VALID(notify));
result = ev->ev_type;
isc_event_free(&ev);
dns_zone_iattach(notify->zone, &zone);
if (result == DNS_EVENT_ADBNOMOREADDRESSES) {
LOCK(&notify->zone->lock);
notify_send(notify);
UNLOCK(&zone->lock);
goto detach;
}
if (result == DNS_EVENT_ADBMOREADDRESSES) {
dns_adb_destroyfind(&notify->find);
notify_find_address(notify);
goto detach;
}
LOCK(&zone->lock);
notify_destroy(notify);
UNLOCK(&zone->lock);
detach:
dns_zone_idetach(&zone);
}
static void
notify_find_address(notify_t *notify) {
isc_result_t result;
unsigned int options;
dns_zone_t *zone = NULL;
REQUIRE(DNS_NOTIFY_VALID(notify));
options = DNS_ADBFIND_WANTEVENT | DNS_ADBFIND_INET |
DNS_ADBFIND_INET6 | DNS_ADBFIND_RETURNLAME;
dns_zone_iattach(notify->zone, &zone);
result = dns_adb_createfind(zone->view->adb,
zone->task,
process_adb_event, notify,
&notify->ns, dns_rootname,
options, 0, NULL, zone->view->dstport,
&notify->find);
/* Something failed? */
if (result != ISC_R_SUCCESS) {
LOCK(&zone->lock);
notify_destroy(notify);
UNLOCK(&zone->lock);
dns_zone_idetach(&zone);
return;
}
/* More addresses pending? */
if ((notify->find->options & DNS_ADBFIND_WANTEVENT) != 0) {
dns_zone_idetach(&zone);
return;
}
/* We have as many addresses as we can get. */
LOCK(&zone->lock);
notify_send(notify);
UNLOCK(&zone->lock);
dns_zone_idetach(&zone);
}
static isc_result_t
notify_send_queue(notify_t *notify) {
isc_event_t *e;
isc_result_t result;
e = isc_event_allocate(notify->mctx, NULL,
DNS_EVENT_NOTIFYSENDTOADDR,
notify_send_toaddr,
notify, sizeof(isc_event_t));
if (e == NULL)
return (ISC_R_NOMEMORY);
e->ev_arg = notify;
e->ev_sender = NULL;
result = isc_ratelimiter_enqueue(notify->zone->zmgr->rl,
notify->zone->task, &e);
if (result != ISC_R_SUCCESS)
isc_event_free(&e);
return (result);
}
static void
notify_send_toaddr(isc_task_t *task, isc_event_t *event) {
notify_t *notify;
isc_result_t result;
dns_message_t *message = NULL;
dns_zone_t *zone = NULL;
isc_netaddr_t dstip;
dns_peer_t *peer = NULL;
dns_name_t *keyname = NULL;
dns_tsigkey_t *key = NULL;
notify = event->ev_arg;
REQUIRE(DNS_NOTIFY_VALID(notify));
UNUSED(task);
LOCK(&notify->zone->lock);
dns_zone_iattach(notify->zone, &zone);
if ((event->ev_attributes & ISC_EVENTATTR_CANCELED) != 0 ||
DNS_ZONE_FLAG(notify->zone, DNS_ZONE_F_EXITING)) {
result = ISC_R_CANCELED;
goto cleanup;
}
result = notify_createmessage(notify->zone, &message);
if (result != ISC_R_SUCCESS)
goto cleanup;
isc_netaddr_fromsockaddr(&dstip, &notify->dst);
result = dns_peerlist_peerbyaddr(zone->view->peers,
&dstip, &peer);
if (result == ISC_R_SUCCESS &&
dns_peer_getkey(peer, &keyname) == ISC_R_SUCCESS)
{
result = dns_tsigkey_find(&key, keyname, NULL,
zone->view->statickeys);
if (result == ISC_R_NOTFOUND)
(void) dns_tsigkey_find(&key, keyname, NULL,
zone->view->dynamickeys);
}
result = dns_request_create(notify->zone->view->requestmgr, message,
&notify->dst, 0, key, 15,
notify->zone->task,
notify_done, notify,
&notify->request);
dns_message_destroy(&message);
cleanup:
if (result != ISC_R_SUCCESS)
notify_destroy(notify);
UNLOCK(&zone->lock);
dns_zone_idetach(&zone);
isc_event_free(&event);
}
static void
notify_send(notify_t *notify) {
dns_adbaddrinfo_t *ai;
isc_sockaddr_t dst;
isc_result_t result;
dns_message_t *message = NULL;
notify_t *new = NULL;
/*
* Zone lock held by caller.
*/
REQUIRE(DNS_NOTIFY_VALID(notify));
result = notify_createmessage(notify->zone, &message);
if (result != ISC_R_SUCCESS)
return;
for (ai = ISC_LIST_HEAD(notify->find->list);
ai != NULL;
ai = ISC_LIST_NEXT(ai, publink)) {
dst = ai->sockaddr;
if (notify_isqueued(notify->zone, NULL, &dst))
continue;
new = NULL;
result = notify_create(notify->mctx, &new);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_zone_iattach(notify->zone, &new->zone);
ISC_LIST_APPEND(new->zone->notifies, new, link);
new->dst = dst;
result = notify_send_queue(new);
if (result != ISC_R_SUCCESS)
goto cleanup;
new = NULL;
}
cleanup:
if (new != NULL)
notify_destroy(new);
notify_destroy(notify);
dns_message_destroy(&message);
}
void
dns_zone_notify(dns_zone_t *zone) {
dns_dbnode_t *node = NULL;
dns_dbversion_t *version = NULL;
dns_name_t *origin = NULL;
dns_name_t master;
dns_rdata_ns_t ns;
dns_rdata_soa_t soa;
dns_rdata_t rdata;
dns_rdataset_t nsrdset;
dns_rdataset_t soardset;
isc_result_t result;
notify_t *notify = NULL;
unsigned int i;
isc_sockaddr_t dst;
isc_boolean_t isqueued;
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
zone->flags &= ~DNS_ZONE_F_NEEDNOTIFY;
UNLOCK(&zone->lock);
if (!DNS_ZONE_OPTION(zone, DNS_ZONE_O_NOTIFY)) {
return;
}
origin = &zone->origin;
/*
* Enqueue notify request.
*/
LOCK(&zone->lock);
for (i = 0; i < zone->notifycnt; i++) {
dst = zone->notify[i];
if (isc_sockaddr_getport(&dst) == 0)
isc_sockaddr_setport(&dst, 53); /* XXX */
if (notify_isqueued(zone, NULL, &dst))
continue;
result = notify_create(zone->mctx, &notify);
if (result != ISC_R_SUCCESS) {
UNLOCK(&zone->lock);
return;
}
dns_zone_iattach(zone, &notify->zone);
notify->dst = dst;
ISC_LIST_APPEND(zone->notifies, notify, link);
result = notify_send_queue(notify);
if (result != ISC_R_SUCCESS) {
notify_destroy(notify);
UNLOCK(&zone->lock);
return;
}
notify = NULL;
}
UNLOCK(&zone->lock);
/*
* Process NS RRset to generate notifies.
*/
dns_db_currentversion(zone->db, &version);
result = dns_db_findnode(zone->db, origin, ISC_FALSE, &node);
if (result != ISC_R_SUCCESS)
goto cleanup1;
dns_rdataset_init(&soardset);
result = dns_db_findrdataset(zone->db, node, version,
dns_rdatatype_soa,
dns_rdatatype_none, 0, &soardset, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup2;
/*
* Find master server's name.
*/
dns_name_init(&master, NULL);
result = dns_rdataset_first(&soardset);
while (result == ISC_R_SUCCESS) {
dns_rdataset_current(&soardset, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
if (result != ISC_R_SUCCESS)
continue;
result = dns_name_dup(&soa.origin, zone->mctx, &master);
if (result != ISC_R_SUCCESS)
continue;
result = dns_rdataset_next(&soardset);
if (result != ISC_R_NOMORE)
break;
}
dns_rdataset_disassociate(&soardset);
if (result != ISC_R_NOMORE)
goto cleanup3;
dns_rdataset_init(&nsrdset);
result = dns_db_findrdataset(zone->db, node, version,
dns_rdatatype_ns,
dns_rdatatype_none, 0, &nsrdset, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup3;
result = dns_rdataset_first(&nsrdset);
while (result == ISC_R_SUCCESS) {
dns_rdataset_current(&nsrdset, &rdata);
result = dns_rdata_tostruct(&rdata, &ns, NULL);
if (result != ISC_R_SUCCESS)
continue;
/*
* don't notify the master server.
*/
if (dns_name_compare(&master, &ns.name) == 0) {
result = dns_rdataset_next(&nsrdset);
continue;
}
LOCK(&zone->lock);
isqueued = notify_isqueued(zone, &ns.name, NULL);
UNLOCK(&zone->lock);
if (isqueued) {
result = dns_rdataset_next(&nsrdset);
continue;
}
result = notify_create(zone->mctx, &notify);
if (result != ISC_R_SUCCESS)
continue;
dns_zone_iattach(zone, &notify->zone);
result = dns_name_dup(&ns.name, zone->mctx, &notify->ns);
if (result != ISC_R_SUCCESS) {
LOCK(&zone->lock);
notify_destroy(notify);
UNLOCK(&zone->lock);
continue;
}
LOCK(&zone->lock);
ISC_LIST_APPEND(zone->notifies, notify, link);
UNLOCK(&zone->lock);
notify_find_address(notify);
notify = NULL;
result = dns_rdataset_next(&nsrdset);
}
dns_rdataset_disassociate(&nsrdset);
cleanup3:
if (dns_name_dynamic(&master))
dns_name_free(&master, zone->mctx);
cleanup2:
dns_db_detachnode(zone->db, &node);
cleanup1:
dns_db_closeversion(zone->db, &version, ISC_FALSE);
}
/***
*** Private
***/
static void
refresh_callback(isc_task_t *task, isc_event_t *event) {
const char me[] = "refresh_callback";
dns_requestevent_t *revent = (dns_requestevent_t *)event;
dns_zone_t *zone;
dns_message_t *msg = NULL;
isc_uint32_t soacnt, cnamecnt, soacount, nscount;
isc_stdtime_t now;
char master[ISC_SOCKADDR_FORMATSIZE];
dns_rdataset_t *rdataset;
dns_rdata_t rdata;
dns_rdata_soa_t soa;
isc_result_t result;
isc_uint32_t serial;
zone = revent->ev_arg;
INSIST(DNS_ZONE_VALID(zone));
UNUSED(task);
DNS_ENTER;
/*
* if timeout log and next master;
*/
isc_sockaddr_format(&zone->masteraddr, master, sizeof(master));
isc_stdtime_get(&now);
if (revent->result != ISC_R_SUCCESS) {
zone_log(zone, me, ISC_LOG_INFO, "failure for %s: %s",
master, dns_result_totext(revent->result));
goto next_master;
}
result = dns_message_create(zone->mctx, DNS_MESSAGE_INTENTPARSE, &msg);
if (result != ISC_R_SUCCESS)
goto next_master;
result = dns_request_getresponse(revent->request, msg, ISC_FALSE);
if (result != ISC_R_SUCCESS)
goto next_master;
/*
* Unexpected rcode.
*/
if (msg->rcode != dns_rcode_noerror) {
char rcode[128];
isc_buffer_t rb;
isc_buffer_init(&rb, rcode, sizeof(rcode));
dns_rcode_totext(msg->rcode, &rb);
zone_log(zone, me, ISC_LOG_INFO,
"unexpected rcode (%.*s) from %s",
rb.used, rcode, master);
goto next_master;
}
/*
* If truncated punt to zone transfer which will query again.
*/
if ((msg->flags & DNS_MESSAGEFLAG_TC) != 0) {
zone_log(zone, me, ISC_LOG_INFO,
"truncated UDP answer initiating TCP zone xfer %s",
master);
goto tcp_transfer;
}
/*
* if non-auth log and next master;
*/
if ((msg->flags & DNS_MESSAGEFLAG_AA) == 0) {
zone_log(zone, me, ISC_LOG_INFO,
"non-authorative answer from %s", master);
goto next_master;
}
cnamecnt = message_count(msg, DNS_SECTION_ANSWER, dns_rdatatype_cname);
soacnt = message_count(msg, DNS_SECTION_ANSWER, dns_rdatatype_soa);
nscount = message_count(msg, DNS_SECTION_AUTHORITY, dns_rdatatype_ns);
soacount = message_count(msg, DNS_SECTION_AUTHORITY,
dns_rdatatype_soa);
/*
* There should not be a CNAME record at top of zone.
*/
if (cnamecnt != 0) {
zone_log(zone, me, ISC_LOG_INFO,
"CNAME at top of zone discovered: master %s", master);
goto next_master;
}
/*
* if referral log and next master;
*/
if (soacnt == 0 && soacount == 0 && nscount != 0) {
zone_log(zone, me, ISC_LOG_INFO,
"referral from: master %s", master);
goto next_master;
}
/*
* if nodata log and next master;
*/
if (soacnt == 0 && (nscount == 0 || soacount != 0)) {
zone_log(zone, me, ISC_LOG_INFO,
"NODATA from master %s", master);
goto next_master;
}
/*
* Only one soa at top of zone.
*/
if (soacnt != 1) {
zone_log(zone, me, ISC_LOG_INFO,
"Answer SOA count (%d) != 1: master %s",
soacnt, master);
goto next_master;
}
/*
* Extract serial
*/
rdataset = NULL;
result = dns_message_findname(msg, DNS_SECTION_ANSWER, &zone->origin,
dns_rdatatype_soa, dns_rdatatype_none,
NULL, &rdataset);
if (result != ISC_R_SUCCESS) {
zone_log(zone, me, ISC_LOG_INFO,
"unable to get soa record from %s", master);
goto next_master;
}
result = dns_rdataset_first(rdataset);
if (result != ISC_R_SUCCESS) {
zone_log(zone, me, ISC_LOG_INFO, "dns_rdataset_first failed");
goto next_master;
}
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
if (result != ISC_R_SUCCESS) {
zone_log(zone, me, ISC_LOG_INFO, "dns_rdata_tostruct failed");
goto next_master;
}
serial = soa.serial;
dns_message_destroy(&msg);
zone_log(zone, me, ISC_LOG_DEBUG(1), "Serial: new %u, old %u",
serial, zone->serial);
if (!DNS_ZONE_FLAG(zone, DNS_ZONE_F_LOADED) ||
isc_serial_gt(serial, zone->serial)) {
tcp_transfer:
isc_event_free(&event);
dns_request_destroy(&zone->request);
queue_xfrin(zone);
} else if (isc_serial_eq(soa.serial, zone->serial)) {
if (zone->dbname != NULL) {
isc_time_t t;
isc_time_set(&t, now, 0);
result = isc_file_settime(zone->dbname, &t);
if (result != ISC_R_SUCCESS)
zone_log(zone, me, ISC_LOG_ERROR,
"isc_file_settime(%s): %s",
zone->dbname,
dns_result_totext(result));
}
zone->refreshtime = now + zone->refresh;
zone->expiretime = now + zone->expire;
goto next_master;
} else {
ZONE_LOG(1, "ahead");
goto next_master;
}
return;
next_master:
if (msg != NULL)
dns_message_destroy(&msg);
LOCK(&zone->lock);
isc_event_free(&event);
dns_request_destroy(&zone->request);
zone->curmaster++;
if (zone->curmaster >= zone->masterscnt) {
zone->flags &= ~DNS_ZONE_F_REFRESH;
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_NEEDREFRESH)) {
zone->flags &= ~DNS_ZONE_F_NEEDREFRESH;
zone->refreshtime = now;
}
zone_settimer(zone, now);
UNLOCK(&zone->lock);
return;
}
UNLOCK(&zone->lock);
queue_soa_query(zone);
return;
}
static void
queue_soa_query(dns_zone_t *zone) {
const char me[] = "queue_soa_query";
isc_event_t *e;
dns_zone_t *dummy = NULL;
isc_result_t result;
DNS_ENTER;
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING)) {
cancel_refresh(zone);
return;
}
e = isc_event_allocate(zone->mctx, NULL, DNS_EVENT_ZONE,
soa_query, zone, sizeof(isc_event_t));
if (e == NULL) {
cancel_refresh(zone);
return;
}
/*
* Attach so that we won't clean up
* until the event is delivered.
*/
dns_zone_iattach(zone, &dummy);
e->ev_arg = zone;
e->ev_sender = NULL;
result = isc_ratelimiter_enqueue(zone->zmgr->rl, zone->task, &e);
if (result != ISC_R_SUCCESS) {
dns_zone_idetach(&dummy);
isc_event_free(&e);
cancel_refresh(zone);
}
}
static void
soa_query(isc_task_t *task, isc_event_t *event) {
const char me[] = "soa_query";
isc_result_t result;
dns_message_t *message = NULL;
dns_name_t *qname = NULL;
dns_rdataset_t *qrdataset = NULL;
dns_zone_t *zone = event->ev_arg;
isc_netaddr_t masterip;
dns_peer_t *peer = NULL;
dns_name_t *keyname = NULL;
dns_tsigkey_t *key = NULL;
REQUIRE(DNS_ZONE_VALID(zone));
UNUSED(task);
DNS_ENTER;
if (((event->ev_attributes & ISC_EVENTATTR_CANCELED) != 0) ||
DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING)) {
if (!DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING))
cancel_refresh(zone);
isc_event_free(&event);
dns_zone_idetach(&zone);
return;
}
/*
* XXX Optimisation: Create message when zone is setup and reuse.
*/
result = dns_message_create(zone->mctx, DNS_MESSAGE_INTENTRENDER,
&message);
if (result != ISC_R_SUCCESS)
goto cleanup;
message->opcode = dns_opcode_query;
message->rdclass = zone->rdclass;
result = dns_message_gettempname(message, &qname);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdataset(message, &qrdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
/*
* Make question.
*/
dns_name_init(qname, NULL);
dns_name_clone(&zone->origin, qname);
dns_rdataset_init(qrdataset);
dns_rdataset_makequestion(qrdataset, zone->rdclass, dns_rdatatype_soa);
ISC_LIST_APPEND(qname->list, qrdataset, link);
dns_message_addname(message, qname, DNS_SECTION_QUESTION);
qname = NULL;
qrdataset = NULL;
LOCK(&zone->lock);
INSIST(zone->masterscnt > 0);
INSIST(zone->curmaster < zone->masterscnt);
zone->masteraddr = zone->masters[zone->curmaster];
UNLOCK(&zone->lock);
if (isc_sockaddr_getport(&zone->masteraddr) == 0)
isc_sockaddr_setport(&zone->masteraddr, 53); /* XXX */
isc_netaddr_fromsockaddr(&masterip, &zone->masteraddr);
result = dns_peerlist_peerbyaddr(zone->view->peers,
&masterip, &peer);
if (result == ISC_R_SUCCESS &&
dns_peer_getkey(peer, &keyname) == ISC_R_SUCCESS)
{
result = dns_tsigkey_find(&key, keyname, NULL,
zone->view->statickeys);
if (result == ISC_R_NOTFOUND)
(void) dns_tsigkey_find(&key, keyname, NULL,
zone->view->dynamickeys);
}
result = dns_request_create(zone->view->requestmgr, message,
&zone->masteraddr, 0, key,
15 /* XXX */, zone->task,
refresh_callback, zone, &zone->request);
if (result != ISC_R_SUCCESS) {
zone_log(zone, me, ISC_LOG_DEBUG(1),
"dns_request_create failed: %s",
dns_result_totext(result));
goto cleanup;
}
dns_message_destroy(&message);
isc_event_free(&event);
dns_zone_idetach(&zone);
return;
cleanup:
if (qname != NULL)
dns_message_puttempname(message, &qname);
if (qrdataset != NULL)
dns_message_puttemprdataset(message, &qrdataset);
if (message != NULL)
dns_message_destroy(&message);
cancel_refresh(zone);
isc_event_free(&event);
dns_zone_idetach(&zone);
return;
}
/*
* Handle the control event. Note that although this event causes the zone
* to shut down, it is not a shutdown event in the sense of the task library.
*/
static void
zone_shutdown(isc_task_t *task, isc_event_t *event) {
dns_zone_t *zone = (dns_zone_t *) event->ev_arg;
notify_t *notify;
isc_result_t result;
UNUSED(task);
REQUIRE(DNS_ZONE_VALID(zone));
INSIST(event->ev_type == DNS_EVENT_ZONECONTROL);
INSIST(zone->erefs == 0);
zone_log(zone, "zone_shutdown", ISC_LOG_DEBUG(3), "shutting down");
LOCK(&zone->lock);
zone->flags |= DNS_ZONE_F_EXITING;
UNLOCK(&zone->lock);
/*
* If we were waiting for xfrin quota, step out of
* the queue.
*/
if (zone->statelist == &zone->zmgr->waiting_for_xfrin) {
RWLOCK(&zone->zmgr->rwlock, isc_rwlocktype_write);
ISC_LIST_UNLINK(zone->zmgr->waiting_for_xfrin, zone,
statelink);
RWUNLOCK(&zone->zmgr->rwlock, isc_rwlocktype_write);
zone->statelist = NULL;
}
if (zone->xfr != NULL)
dns_xfrin_shutdown(zone->xfr);
if (zone->request != NULL)
dns_request_cancel(zone->request);
for (notify = ISC_LIST_HEAD(zone->notifies);
notify != NULL;
notify = ISC_LIST_NEXT(notify, link)) {
if (notify->find != NULL)
dns_adb_cancelfind(notify->find);
if (notify->request != NULL)
dns_request_cancel(notify->request);
}
if (zone->timer != NULL) {
result = isc_timer_reset(zone->timer, isc_timertype_inactive,
NULL, NULL, ISC_TRUE);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
}
if (zone->view != NULL)
dns_view_weakdetach(&zone->view);
exit_check(zone);
}
static void
zone_timer(isc_task_t *task, isc_event_t *event) {
const char me[] = "zone_timer";
dns_zone_t *zone = (dns_zone_t *)event->ev_arg;
UNUSED(task);
DNS_ENTER;
dns_zonemgr_lockconf(zone->zmgr, isc_rwlocktype_read);
/* XXX if we use a view, we need to lock its configuration, too. */
dns_zone_maintenance(zone);
dns_zonemgr_unlockconf(zone->zmgr, isc_rwlocktype_read);
isc_event_free(&event);
}
static isc_result_t
zone_settimer(dns_zone_t *zone, isc_stdtime_t now) {
const char me[] = "zone_settimer";
isc_stdtime_t next = 0;
isc_time_t expires;
isc_interval_t interval;
isc_result_t result;
REQUIRE(DNS_ZONE_VALID(zone));
switch (zone->type) {
case dns_zone_master:
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_NEEDNOTIFY))
next = now;
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_NEEDDUMP) &&
(zone->dumptime < next || next == 0))
next = zone->dumptime;
break;
case dns_zone_slave:
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_NEEDNOTIFY))
next = now;
/*FALLTHROUGH*/
case dns_zone_stub:
if (!DNS_ZONE_FLAG(zone, DNS_ZONE_F_REFRESH) &&
!DNS_ZONE_FLAG(zone, DNS_ZONE_F_NOMASTERS) &&
(zone->refreshtime < next || next == 0))
next = zone->refreshtime;
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_LOADED)) {
if (zone->expiretime < next || next == 0)
next = zone->expiretime;
}
break;
default:
break;
}
if (next == 0) {
zone_log(zone, me, ISC_LOG_DEBUG(10),
"settimer inactive");
result = isc_timer_reset(zone->timer, isc_timertype_inactive,
NULL, NULL, ISC_TRUE);
} else {
if (next <= now)
next = now + 1;
zone_log(zone, me, ISC_LOG_DEBUG(10),
"settimer %d %d = %d seconds",
next, now, next - now);
isc_time_settoepoch(&expires);
isc_interval_set(&interval, next - now, 0);
result = isc_timer_reset(zone->timer, isc_timertype_once,
&expires, &interval, ISC_TRUE);
}
if (result != ISC_R_SUCCESS)
return (result);
return (ISC_R_SUCCESS);
}
static void
cancel_refresh(dns_zone_t *zone) {
const char me[] = "cancel_refresh";
isc_stdtime_t now;
/*
* caller to lock.
*/
REQUIRE(DNS_ZONE_VALID(zone));
DNS_ENTER;
zone->flags &= ~DNS_ZONE_F_REFRESH;
isc_stdtime_get(&now);
if (!DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING))
zone_settimer(zone, now);
}
static isc_result_t
notify_createmessage(dns_zone_t *zone, dns_message_t **messagep)
{
dns_dbnode_t *node = NULL;
dns_dbversion_t *version = NULL;
dns_message_t *message = NULL;
dns_rdataset_t rdataset;
dns_rdata_t rdata;
dns_name_t *tempname = NULL;
dns_rdata_t *temprdata = NULL;
dns_rdatalist_t *temprdatalist = NULL;
dns_rdataset_t *temprdataset = NULL;
isc_result_t result;
isc_region_t r;
isc_buffer_t *b = NULL;
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(messagep != NULL && *messagep == NULL);
message = NULL;
result = dns_message_create(zone->mctx, DNS_MESSAGE_INTENTRENDER,
&message);
if (result != ISC_R_SUCCESS)
goto fail;
message->opcode = dns_opcode_notify;
message->rdclass = zone->rdclass;
result = dns_message_gettempname(message, &tempname);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdataset(message, &temprdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
/*
* Make question.
*/
dns_name_init(tempname, NULL);
dns_name_clone(&zone->origin, tempname);
dns_rdataset_init(temprdataset);
dns_rdataset_makequestion(temprdataset, zone->rdclass,
dns_rdatatype_soa);
ISC_LIST_APPEND(tempname->list, temprdataset, link);
dns_message_addname(message, tempname, DNS_SECTION_QUESTION);
tempname = NULL;
temprdataset = NULL;
/*
* If the zone is dialup we are done as we don't want to send
* the current soa so as to force a refresh query.
*/
if (DNS_ZONE_OPTION(zone, DNS_ZONE_O_DIALUP))
goto done;
result = dns_message_gettempname(message, &tempname);
if (result != ISC_R_SUCCESS)
goto done;
result = dns_message_gettemprdata(message, &temprdata);
if (result != ISC_R_SUCCESS)
goto done;
result = dns_message_gettemprdataset(message, &temprdataset);
if (result != ISC_R_SUCCESS)
goto done;
result = dns_message_gettemprdatalist(message, &temprdatalist);
if (result != ISC_R_SUCCESS)
goto done;
dns_name_init(tempname, NULL);
dns_name_clone(&zone->origin, tempname);
dns_db_currentversion(zone->db, &version);
result = dns_db_findnode(zone->db, tempname, ISC_FALSE, &node);
if (result != ISC_R_SUCCESS)
goto done;
dns_rdataset_init(&rdataset);
result = dns_db_findrdataset(zone->db, node, version,
dns_rdatatype_soa,
dns_rdatatype_none, 0, &rdataset,
NULL);
if (result != ISC_R_SUCCESS)
goto done;
result = dns_rdataset_first(&rdataset);
if (result != ISC_R_SUCCESS)
goto done;
dns_rdata_init(&rdata);
dns_rdataset_current(&rdataset, &rdata);
dns_rdata_toregion(&rdata, &r);
result = isc_buffer_allocate(zone->mctx, &b, r.length);
if (result != ISC_R_SUCCESS)
goto done;
isc_buffer_putmem(b, r.base, r.length);
isc_buffer_usedregion(b, &r);
dns_rdata_init(temprdata);
dns_rdata_fromregion(temprdata, rdata.rdclass, rdata.type, &r);
dns_message_takebuffer(message, &b);
result = dns_rdataset_next(&rdataset);
dns_rdataset_disassociate(&rdataset);
if (result != ISC_R_NOMORE)
goto done;
temprdatalist->rdclass = rdata.rdclass;
temprdatalist->type = rdata.type;
temprdatalist->covers = 0;
temprdatalist->ttl = rdataset.ttl;
ISC_LIST_INIT(temprdatalist->rdata);
ISC_LIST_APPEND(temprdatalist->rdata, temprdata, link);
dns_rdataset_init(temprdataset);
result = dns_rdatalist_tordataset(temprdatalist, temprdataset);
if (result != ISC_R_SUCCESS)
goto done;
ISC_LIST_APPEND(tempname->list, temprdataset, link);
dns_message_addname(message, tempname, DNS_SECTION_ANSWER);
temprdatalist = NULL;
temprdataset = NULL;
temprdata = NULL;
tempname = NULL;
done:
*messagep = message;
message = NULL;
result = ISC_R_SUCCESS;
cleanup:
if (node != NULL)
dns_db_detachnode(zone->db, &node);
if (version != NULL)
dns_db_closeversion(zone->db, &version, ISC_FALSE);
if (tempname != NULL)
dns_message_puttempname(message, &tempname);
if (temprdata != NULL)
dns_message_puttemprdata(message, &temprdata);
if (temprdataset != NULL)
dns_message_puttemprdataset(message, &temprdataset);
if (temprdatalist != NULL)
dns_message_puttemprdatalist(message, &temprdatalist);
if (message != NULL)
dns_message_destroy(&message);
fail:
return (result);
}
isc_result_t
dns_zone_notifyreceive(dns_zone_t *zone, isc_sockaddr_t *from,
dns_message_t *msg)
{
const char me[] = "dns_zone_notifyreceive";
unsigned int i;
dns_rdata_soa_t soa;
dns_rdataset_t *rdataset = NULL;
dns_rdata_t rdata;
isc_result_t result;
isc_stdtime_t now;
REQUIRE(DNS_ZONE_VALID(zone));
/*
* If type != T_SOA return DNS_R_REFUSED. We don't yet support
* ROLLOVER.
*
* SOA: RFC 1996
* Check that 'from' is a valid notify source, (zone->masters).
* Return DNS_R_REFUSED if not.
*
* If the notify message contains a serial number check it
* against the zones serial and return if <= current serial
*
* If a refresh check is progress, if so just record the
* fact we received a NOTIFY and from where and return.
* We will perform a new refresh check when the current one
* completes. Return ISC_R_SUCCESS.
*
* Otherwise initiate a refresh check using 'from' as the
* first address to check. Return ISC_R_SUCCESS.
*/
/*
* We only handle NOTIFY (SOA) at the present.
*/
LOCK(&zone->lock);
if (msg->counts[DNS_SECTION_QUESTION] == 0 ||
dns_message_findname(msg, DNS_SECTION_QUESTION, &zone->origin,
dns_rdatatype_soa, dns_rdatatype_none,
NULL, NULL) != ISC_R_SUCCESS) {
UNLOCK(&zone->lock);
if (msg->counts[DNS_SECTION_QUESTION] == 0) {
zone_log(zone, me, ISC_LOG_NOTICE,
"FORMERR no question");
return (DNS_R_FORMERR);
}
zone_log(zone, me, ISC_LOG_NOTICE,
"REFUSED zone does not match");
return (DNS_R_NOTIMP);
}
/*
* If we are a master zone just succeed.
*/
if (zone->type == dns_zone_master) {
UNLOCK(&zone->lock);
return (ISC_R_SUCCESS);
}
for (i = 0; i < zone->masterscnt; i++)
if (isc_sockaddr_eqaddr(from, &zone->masters[i]))
break;
if (i >= zone->masterscnt) {
UNLOCK(&zone->lock);
zone_log(zone, me, ISC_LOG_DEBUG(3),
"REFUSED notify from non master");
return (DNS_R_REFUSED);
}
/*
* If the zone is loaded and there are answers check the serial
* to see if we need to do a refresh. Do not worry about this
* check if we are a dialup zone as we use the notify request
* to trigger a refresh check.
*/
if (msg->counts[DNS_SECTION_ANSWER] > 0 &&
DNS_ZONE_FLAG(zone, DNS_ZONE_F_LOADED) &&
!DNS_ZONE_OPTION(zone, DNS_ZONE_O_DIALUP)) {
result = dns_message_findname(msg, DNS_SECTION_ANSWER,
&zone->origin,
dns_rdatatype_soa,
dns_rdatatype_none, NULL,
&rdataset);
if (result == ISC_R_SUCCESS)
result = dns_rdataset_first(rdataset);
if (result == ISC_R_SUCCESS) {
isc_uint32_t serial = 0;
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
if (result == ISC_R_SUCCESS) {
serial = soa.serial;
if (isc_serial_le(serial, zone->serial)) {
zone_log(zone, me, ISC_LOG_DEBUG(3),
"zone up to date");
UNLOCK(&zone->lock);
return (ISC_R_SUCCESS);
}
}
}
}
/*
* If we got this far and there was a refresh in progress just
* let it complete. Record where we got the notify from so we
* can perform a refresh check when the current one completes
*/
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_REFRESH)) {
zone->flags |= DNS_ZONE_F_NEEDREFRESH;
zone->notifyfrom = *from;
UNLOCK(&zone->lock);
zone_log(zone, me, ISC_LOG_DEBUG(3),
"refresh in progress, refresh check queued");
return (ISC_R_SUCCESS);
}
isc_stdtime_get(&now);
zone->refreshtime = now;
zone->notifyfrom = *from;
zone_settimer(zone, now);
UNLOCK(&zone->lock);
zone_log(zone, me, ISC_LOG_DEBUG(3), "immediate refresh check queued");
return (ISC_R_SUCCESS);
}
void
dns_zone_setqueryacl(dns_zone_t *zone, dns_acl_t *acl) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->query_acl != NULL)
dns_acl_detach(&zone->query_acl);
dns_acl_attach(acl, &zone->query_acl);
UNLOCK(&zone->lock);
}
void
dns_zone_setupdateacl(dns_zone_t *zone, dns_acl_t *acl) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->update_acl != NULL)
dns_acl_detach(&zone->update_acl);
dns_acl_attach(acl, &zone->update_acl);
UNLOCK(&zone->lock);
}
void
dns_zone_setxfracl(dns_zone_t *zone, dns_acl_t *acl) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->xfr_acl != NULL)
dns_acl_detach(&zone->xfr_acl);
dns_acl_attach(acl, &zone->xfr_acl);
UNLOCK(&zone->lock);
}
dns_acl_t *
dns_zone_getqueryacl(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->query_acl);
}
dns_acl_t *
dns_zone_getupdateacl(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->update_acl);
}
dns_acl_t *
dns_zone_getxfracl(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->xfr_acl);
}
void
dns_zone_clearupdateacl(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->update_acl != NULL)
dns_acl_detach(&zone->update_acl);
UNLOCK(&zone->lock);
}
void
dns_zone_clearqueryacl(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->query_acl != NULL)
dns_acl_detach(&zone->query_acl);
UNLOCK(&zone->lock);
}
void
dns_zone_clearxfracl(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->xfr_acl != NULL)
dns_acl_detach(&zone->xfr_acl);
UNLOCK(&zone->lock);
}
void
dns_zone_setchecknames(dns_zone_t *zone, dns_severity_t severity) {
REQUIRE(DNS_ZONE_VALID(zone));
zone->check_names = severity;
}
dns_severity_t
dns_zone_getchecknames(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->check_names);
}
void
dns_zone_setjournalsize(dns_zone_t *zone, isc_int32_t size) {
REQUIRE(DNS_ZONE_VALID(zone));
zone->journalsize = size;
}
isc_int32_t
dns_zone_getjournalsize(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->journalsize);
}
static void
zone_log(dns_zone_t *zone, const char *me, int level, const char *fmt, ...) {
va_list ap;
char message[4096];
char namebuf[1024+32];
isc_buffer_t buffer;
int len;
isc_result_t result = ISC_R_FAILURE;
isc_buffer_init(&buffer, namebuf, sizeof(namebuf));
if (dns_name_dynamic(&zone->origin)) {
if (dns_name_equal(&zone->origin, dns_rootname))
result = dns_name_totext(&zone->origin, ISC_FALSE,
&buffer);
else
result = dns_name_totext(&zone->origin, ISC_TRUE,
&buffer);
}
if (result != ISC_R_SUCCESS)
isc_buffer_putstr(&buffer, "<UNKNOWN>");
isc_buffer_putstr(&buffer, "/");
(void)dns_rdataclass_totext(zone->rdclass, &buffer);
len = isc_buffer_usedlength(&buffer);
va_start(ap, fmt);
vsnprintf(message, sizeof message, fmt, ap);
va_end(ap);
isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_ZONE,
level, "%s: zone %.*s: %s", me, len, namebuf, message);
}
static int
message_count(dns_message_t *msg, dns_section_t section, dns_rdatatype_t type)
{
isc_result_t result;
dns_name_t *name;
dns_rdataset_t *curr;
int count = 0;
result = dns_message_firstname(msg, section);
while (result == ISC_R_SUCCESS) {
name = NULL;
dns_message_currentname(msg, section, &name);
for (curr = ISC_LIST_TAIL(name->list); curr != NULL;
curr = ISC_LIST_PREV(curr, link)) {
if (curr->type == type)
count++;
}
result = dns_message_nextname(msg, section);
}
return (count);
}
void
dns_zone_setmaxxfrin(dns_zone_t *zone, isc_uint32_t maxxfrin) {
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(maxxfrin != 0);
zone->maxxfrin = maxxfrin;
}
isc_uint32_t
dns_zone_getmaxxfrin(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->maxxfrin);
}
void
dns_zone_setmaxxfrout(dns_zone_t *zone, isc_uint32_t maxxfrout) {
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(maxxfrout != 0);
zone->maxxfrout = maxxfrout;
}
isc_uint32_t
dns_zone_getmaxxfrout(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->maxxfrout);
}
dns_zonetype_t dns_zone_gettype(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->type);
}
dns_name_t *
dns_zone_getorigin(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (&zone->origin);
}
void
dns_zone_settask(dns_zone_t *zone, isc_task_t *task) {
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
if (zone->task != NULL)
isc_task_detach(&zone->task);
isc_task_attach(task, &zone->task);
UNLOCK(&zone->lock);
}
void
dns_zone_gettask(dns_zone_t *zone, isc_task_t **target) {
REQUIRE(DNS_ZONE_VALID(zone));
isc_task_attach(zone->task, target);
}
const char *
dns_zone_getdatabase(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->dbname);
}
void
dns_zone_setidlein(dns_zone_t *zone, isc_uint32_t idlein) {
REQUIRE(DNS_ZONE_VALID(zone));
if (idlein == 0)
idlein = DNS_DEFAULT_IDLEIN;
zone->idlein = idlein;
}
isc_uint32_t
dns_zone_getidlein(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->idlein);
}
void
dns_zone_setidleout(dns_zone_t *zone, isc_uint32_t idleout) {
REQUIRE(DNS_ZONE_VALID(zone));
if (idleout == 0)
idleout = DNS_DEFAULT_IDLEOUT;
zone->idleout = idleout;
}
isc_uint32_t
dns_zone_getidleout(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
return (zone->idleout);
}
#ifdef notyet
static void
record_serial() {
}
#endif
static void
notify_done(isc_task_t *task, isc_event_t *event) {
const char me[] = "notify_done";
notify_t *notify;
dns_zone_t *zone = NULL;
UNUSED(task);
notify = event->ev_arg;
REQUIRE(DNS_NOTIFY_VALID(notify));
dns_zone_iattach(notify->zone, &zone);
DNS_ENTER;
isc_event_free(&event);
LOCK(&zone->lock);
notify_destroy(notify);
UNLOCK(&zone->lock);
dns_zone_idetach(&zone);
}
isc_boolean_t
dns_zone_equal(dns_zone_t *oldzone, dns_zone_t *newzone) {
unsigned int i;
REQUIRE(DNS_ZONE_VALID(oldzone));
REQUIRE(DNS_ZONE_VALID(newzone));
LOCK(&oldzone->lock);
LOCK(&newzone->lock);
if (oldzone->type != newzone->type ||
oldzone->maxxfrin != newzone->maxxfrin ||
oldzone->maxxfrout != newzone->maxxfrout ||
oldzone->idlein != newzone->idlein ||
oldzone->idleout != newzone->idleout ||
oldzone->rdclass != newzone->rdclass ||
oldzone->db_argc != newzone->db_argc ||
oldzone->notifycnt != newzone->notifycnt ||
oldzone->masterscnt != newzone->masterscnt ||
oldzone->check_names != newzone->check_names ||
oldzone->diff_on_reload != newzone->diff_on_reload ||
oldzone->journalsize != newzone->journalsize)
goto false;
if (!dns_name_equal(&oldzone->origin, &newzone->origin))
goto false;
if ((oldzone->journal == NULL && newzone->journal != NULL) ||
(oldzone->journal != NULL && newzone->journal == NULL) ||
(oldzone->journal != NULL &&
strcmp(oldzone->journal, newzone->journal) != 0))
goto false;
if ((oldzone->db_type == NULL && newzone->db_type != NULL) ||
(oldzone->db_type != NULL && newzone->db_type == NULL) ||
(oldzone->db_type != NULL &&
strcmp(oldzone->db_type, newzone->db_type) != 0))
goto false;
for (i = 0; i < oldzone->db_argc; i++)
if (strcmp(oldzone->db_argv[i], newzone->db_argv[i]) != 0)
goto false;
if (!isc_sockaddr_equal(&oldzone->xfrsource4, &newzone->xfrsource4))
goto false;
if (!isc_sockaddr_equal(&oldzone->xfrsource6, &newzone->xfrsource6))
goto false;
for (i = 0; i < oldzone->notifycnt; i++)
if (!isc_sockaddr_equal(&oldzone->notify[i],
&newzone->notify[i]))
goto false;
for (i = 0; i < oldzone->masterscnt; i++)
if (!isc_sockaddr_equal(&oldzone->masters[i],
&newzone->masters[i]))
goto false;
#define COMPARE_POINTERS(equalp, member) \
if ((oldzone->member == NULL && newzone->member != NULL) || \
(oldzone->member != NULL && newzone->member == NULL) || \
(oldzone->member != NULL && \
!(equalp)(oldzone->member, newzone->member))) \
goto false
COMPARE_POINTERS(dns_acl_equal, update_acl);
COMPARE_POINTERS(dns_acl_equal, query_acl);
COMPARE_POINTERS(dns_acl_equal, xfr_acl);
#undef COMPARE_POINTERS
UNLOCK(&newzone->lock);
UNLOCK(&oldzone->lock);
return(ISC_TRUE); /* XXX should be ISC_TRUE once acl/pubkey
checks are done. */
false:
UNLOCK(&newzone->lock);
UNLOCK(&oldzone->lock);
return (ISC_FALSE);
}
isc_result_t
dns_zone_replacedb(dns_zone_t *zone, dns_db_t *db, isc_boolean_t dump) {
isc_result_t result;
REQUIRE(DNS_ZONE_VALID(zone));
LOCK(&zone->lock);
result = zone_replacedb(zone, db, dump);
UNLOCK(&zone->lock);
return (result);
}
static isc_result_t
zone_replacedb(dns_zone_t *zone, dns_db_t *db, isc_boolean_t dump) {
dns_dbversion_t *ver;
isc_result_t result;
REQUIRE(DNS_ZONE_VALID(zone));
ver = NULL;
dns_db_currentversion(db, &ver);
/*
* The initial version of a slave zone is always dumped;
* subsequent versions may be journalled instead if this
* is enabled in the configuration.
*/
if (zone->db != NULL && zone->journal != NULL &&
zone->diff_on_reload) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
DNS_LOGMODULE_ZONE, ISC_LOG_DEBUG(3),
"generating diffs");
result = dns_db_diff(zone->mctx, db, ver,
zone->db, NULL /* XXX */,
zone->journal);
if (result != ISC_R_SUCCESS)
goto fail;
} else {
if (dump) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
DNS_LOGMODULE_ZONE, ISC_LOG_DEBUG(3),
"dumping new zone version");
/* XXX should use temporary file and rename */
result = dns_db_dump(db, ver, zone->dbname);
if (result != ISC_R_SUCCESS)
goto fail;
/*
* Update the time the zone was updated, so
* dns_zone_load can avoid loading it when
* the server is reloaded. If isc_time_now
* fails for some reason, all that happens is
* the timestamp is not updated.
*/
(void)isc_time_now(&zone->loadtime);
}
if (zone->journal != NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
DNS_LOGMODULE_ZONE, ISC_LOG_DEBUG(3),
"removing journal file");
(void)remove(zone->journal);
}
}
dns_db_closeversion(db, &ver, ISC_FALSE);
isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
DNS_LOGMODULE_ZONE, ISC_LOG_DEBUG(3),
"replacing zone database");
if (zone->db != NULL)
dns_db_detach(&zone->db);
dns_db_attach(db, &zone->db);
zone->flags |= DNS_ZONE_F_LOADED|DNS_ZONE_F_NEEDNOTIFY;
return (ISC_R_SUCCESS);
fail:
dns_db_closeversion(db, &ver, ISC_FALSE);
return (result);
}
static void
zone_xfrdone(dns_zone_t *zone, isc_result_t result) {
const char me[] = "zone_xfrdone";
isc_stdtime_t now;
isc_boolean_t again = ISC_FALSE;
unsigned int soacount;
unsigned int nscount;
isc_uint32_t serial, refresh, retry, expire, minimum;
REQUIRE(DNS_ZONE_VALID(zone));
zone_log(zone, me, ISC_LOG_DEBUG(1), "%s", dns_result_totext(result));
LOCK(&zone->lock);
INSIST((zone->flags & DNS_ZONE_F_REFRESH) != 0);
zone->flags &= ~DNS_ZONE_F_REFRESH;
isc_stdtime_get(&now);
switch (result) {
case ISC_R_SUCCESS:
zone->flags |= DNS_ZONE_F_NEEDNOTIFY;
/*FALLTHROUGH*/
case DNS_R_UPTODATE:
/*
* This is not neccessary if we just performed a AXFR
* however it is necessary for an IXFR / UPTODATE and
* won't hurt with an AXFR.
*/
if (zone->dbname != NULL) {
isc_time_t t;
isc_time_set(&t, now, 0);
result = isc_file_settime(zone->dbname, &t);
if (result != ISC_R_SUCCESS)
zone_log(zone, me, ISC_LOG_ERROR,
"isc_file_settime(%s): %s",
zone->dbname,
dns_result_totext(result));
}
/*
* Update the zone structure's data from the actual
* SOA received.
*/
nscount = 0;
soacount = 0;
INSIST(zone->db != NULL);
result = zone_get_from_db(zone->db, &zone->origin, &nscount,
&soacount, &serial, &refresh,
&retry, &expire, &minimum);
if (result == ISC_R_SUCCESS) {
if (soacount != 1)
zone_log(zone, me, ISC_LOG_ERROR,
"has %d SOA record%s", soacount,
(soacount != 0) ? "s" : "");
if (nscount == 0)
zone_log(zone, me, ISC_LOG_ERROR,
"no NS records");
zone->serial = serial;
zone->refresh = RANGE(refresh, DNS_MIN_REFRESH,
DNS_MAX_REFRESH);
zone->retry = RANGE(retry, DNS_MIN_REFRESH,
DNS_MAX_REFRESH);
zone->expire = RANGE(expire,
zone->refresh + zone->retry,
DNS_MAX_EXPIRE);
zone->minimum = minimum;
}
/*
* Set our next update/expire times.
*/
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_NEEDREFRESH)) {
zone->flags &= ~DNS_ZONE_F_NEEDREFRESH;
zone->refreshtime = now;
zone->expiretime = now + zone->expire;
} else {
zone->refreshtime = now + zone->refresh;
zone->expiretime = now + zone->expire;
}
break;
default:
zone->curmaster++;
if (zone->curmaster >= zone->masterscnt)
zone->curmaster = 0;
else {
zone->flags |= DNS_ZONE_F_REFRESH;
again = ISC_TRUE;
}
break;
}
zone_settimer(zone, now);
UNLOCK(&zone->lock);
/*
* If creating the transfer object failed, zone->xfr is NULL.
* Otherwise, we are called as the done callback of a zone
* transfer object that just entered its shutting-down
* state. Since we are no longer responsible for shutting
* it down, we can detach our reference.
*/
if (zone->xfr != NULL)
dns_xfrin_detach(&zone->xfr);
/*
* This transfer finishing freed up a transfer quota slot.
* Let any zones waiting for quota have it.
*/
RWLOCK(&zone->zmgr->rwlock, isc_rwlocktype_write);
ISC_LIST_UNLINK(zone->zmgr->xfrin_in_progress, zone, statelink);
zone->statelist = NULL;
if (!DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING))
zmgr_resume_xfrs(zone->zmgr);
RWUNLOCK(&zone->zmgr->rwlock, isc_rwlocktype_write);
/*
* Retry with a different server if necessary.
*/
if (again && !DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING))
queue_soa_query(zone);
}
void
dns_zone_getssutable(dns_zone_t *zone, dns_ssutable_t **table) {
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(table != NULL);
REQUIRE(*table == NULL);
*table = zone->ssutable;
}
void
dns_zone_setssutable(dns_zone_t *zone, dns_ssutable_t *table) {
REQUIRE(DNS_ZONE_VALID(zone));
REQUIRE(table != NULL);
zone->ssutable = table;
}
static void
queue_xfrin(dns_zone_t *zone) {
const char me[] = "queue_xfrin";
isc_result_t result;
dns_zonemgr_t *zmgr = zone->zmgr;
DNS_ENTER;
INSIST(zone->statelist == NULL);
RWLOCK(&zmgr->rwlock, isc_rwlocktype_write);
ISC_LIST_APPEND(zmgr->waiting_for_xfrin, zone, statelink);
zone->statelist = &zmgr->waiting_for_xfrin;
result = zmgr_start_xfrin_ifquota(zmgr, zone);
RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write);
if (result == ISC_R_QUOTA) {
zone_log(zone, me, ISC_LOG_DEBUG(1),
"zone transfer deferred due to quota");
} else if (result != ISC_R_SUCCESS) {
zone_log(zone, me, ISC_LOG_ERROR,
"starting zone transfer: %s",
isc_result_totext(result));
}
}
/*
* This event callback is called when a zone has received
* any necessary zone transfer quota. This is the time
* to go ahead and start the transfer.
*/
static void
got_transfer_quota(isc_task_t *task, isc_event_t *event) {
const char me[] = "got_transfer_quota";
isc_result_t result;
dns_peer_t *peer = NULL;
dns_tsigkey_t *tsigkey = NULL;
dns_name_t *keyname = NULL;
char mastertext[256];
dns_rdatatype_t xfrtype;
dns_zone_t *zone = event->ev_arg;
isc_netaddr_t masterip;
UNUSED(task);
INSIST(task == zone->task);
if (DNS_ZONE_FLAG(zone, DNS_ZONE_F_EXITING)) {
result = ISC_R_CANCELED;
goto cleanup;
}
isc_sockaddr_format(&zone->masteraddr, mastertext, sizeof(mastertext));
isc_netaddr_fromsockaddr(&masterip, &zone->masteraddr);
(void)dns_peerlist_peerbyaddr(zone->view->peers,
&masterip, &peer);
/*
* Decide whether we should request IXFR or AXFR.
*/
if (zone->db == NULL) {
zone_log(zone, me, ISC_LOG_DEBUG(3),
"no database exists yet, requesting AXFR of "
"initial version from %s", mastertext);
xfrtype = dns_rdatatype_axfr;
} else {
isc_boolean_t use_ixfr = ISC_TRUE;
if (peer != NULL &&
dns_peer_getrequestixfr(peer, &use_ixfr) ==
ISC_R_SUCCESS) {
; /* Using peer setting */
} else {
use_ixfr = zone->view->requestixfr;
}
if (use_ixfr == ISC_FALSE) {
zone_log(zone, me, ISC_LOG_DEBUG(3),
"IXFR disabled, requesting AXFR from %s",
mastertext);
xfrtype = dns_rdatatype_axfr;
} else {
zone_log(zone, me, ISC_LOG_DEBUG(3),
"requesting IXFR form %s",
mastertext);
xfrtype = dns_rdatatype_ixfr;
}
}
/*
* Determine if we should attempt to sign the request with TSIG.
*/
if (peer != NULL && dns_peer_getkey(peer, &keyname) == ISC_R_SUCCESS) {
dns_view_t *view = dns_zone_getview(zone);
result = dns_tsigkey_find(&tsigkey, keyname, NULL,
view->statickeys);
if (result == ISC_R_NOTFOUND)
result = dns_tsigkey_find(&tsigkey, keyname, NULL,
view->dynamickeys);
if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND) {
zone_log(zone, me, ISC_LOG_ERROR,
"error getting tsig keys "
"for zone transfer: %s",
isc_result_totext(result));
goto cleanup;
}
}
result = dns_xfrin_create(zone, xfrtype, &zone->masteraddr,
tsigkey, zone->mctx,
zone->zmgr->timermgr, zone->zmgr->socketmgr,
zone->task, zone_xfrdone, &zone->xfr);
cleanup:
/*
* Any failure in this function is handled like a failed
* zone transfer. This ensures that we get removed from
* zmgr->xfrin_in_progress.
*/
if (result != ISC_R_SUCCESS)
zone_xfrdone(zone, result);
isc_event_free(&event);
dns_zone_detach(&zone); /* XXXAG */
return;
}
/***
*** Zone manager.
***/
isc_result_t
dns_zonemgr_create(isc_mem_t *mctx, isc_taskmgr_t *taskmgr,
isc_timermgr_t *timermgr, isc_socketmgr_t *socketmgr,
dns_zonemgr_t **zmgrp)
{
dns_zonemgr_t *zmgr;
isc_result_t result;
isc_interval_t interval;
zmgr = isc_mem_get(mctx, sizeof *zmgr);
if (zmgr == NULL)
return (ISC_R_NOMEMORY);
zmgr->mctx = NULL;
zmgr->refs = 1;
isc_mem_attach(mctx, &zmgr->mctx);
zmgr->taskmgr = taskmgr;
zmgr->timermgr = timermgr;
zmgr->socketmgr = socketmgr;
zmgr->zonetasks = NULL;
zmgr->task = NULL;
zmgr->rl = NULL;
ISC_LIST_INIT(zmgr->zones);
ISC_LIST_INIT(zmgr->waiting_for_xfrin);
ISC_LIST_INIT(zmgr->xfrin_in_progress);
result = isc_rwlock_init(&zmgr->rwlock, 0, 0);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_rwlock_init() failed: %s",
isc_result_totext(result));
result = ISC_R_UNEXPECTED;
goto free_mem;
}
result = isc_rwlock_init(&zmgr->conflock, 1, 1);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_rwlock_init() failed: %s",
isc_result_totext(result));
result = ISC_R_UNEXPECTED;
goto free_rwlock;
}
zmgr->transfersin = 10;
zmgr->transfersperns = 2;
/* Create the zone task pool. */
result = isc_taskpool_create(taskmgr, mctx,
8 /* XXX */, 0, &zmgr->zonetasks);
if (result != ISC_R_SUCCESS)
goto free_conflock;
/* Create a single task for queueing of SOA queries. */
result = isc_task_create(taskmgr, 1, &zmgr->task);
if (result != ISC_R_SUCCESS)
goto free_taskpool;
isc_task_setname(zmgr->task, "zmgr", zmgr);
result = isc_ratelimiter_create(mctx, timermgr, zmgr->task,
&zmgr->rl);
if (result != ISC_R_SUCCESS)
goto free_task;
/* 20 refresh queries / notifies per second. */
isc_interval_set(&interval, 0, 1000000000/2);
result = isc_ratelimiter_setinterval(zmgr->rl, &interval);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
isc_ratelimiter_setpertic(zmgr->rl, 10);
*zmgrp = zmgr;
return (ISC_R_SUCCESS);
free_task:
isc_task_detach(&zmgr->task);
free_taskpool:
isc_taskpool_destroy(&zmgr->zonetasks);
free_conflock:
isc_rwlock_destroy(&zmgr->conflock);
free_rwlock:
isc_rwlock_destroy(&zmgr->rwlock);
free_mem:
isc_mem_put(zmgr->mctx, zmgr, sizeof *zmgr);
isc_mem_detach(&mctx);
return (result);
}
isc_result_t
dns_zonemgr_managezone(dns_zonemgr_t *zmgr, dns_zone_t *zone) {
isc_result_t result;
REQUIRE(DNS_ZONE_VALID(zone));
RWLOCK(&zmgr->rwlock, isc_rwlocktype_write);
LOCK(&zone->lock);
REQUIRE(zone->task == NULL);
REQUIRE(zone->timer == NULL);
REQUIRE(zone->zmgr == NULL);
isc_taskpool_gettask(zmgr->zonetasks,
dns_name_hash(dns_zone_getorigin(zone),
ISC_FALSE),
&zone->task);
/*
* Set the task name. The tag will arbitrarily point to one
* of the zones sharing the task (in practice, the one
* to be managed last).
*/
isc_task_setname(zone->task, "zone", zone);
result = isc_timer_create(zmgr->timermgr, isc_timertype_inactive,
NULL, NULL,
zmgr->task, zone_timer, zone,
&zone->timer);
if (result != ISC_R_SUCCESS)
goto cleanup_task;
ISC_LIST_APPEND(zmgr->zones, zone, link);
zone->zmgr = zmgr;
zmgr->refs++;
goto unlock;
cleanup_task:
isc_task_detach(&zone->task);
unlock:
UNLOCK(&zone->lock);
RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write);
return (result);
}
void
dns_zonemgr_releasezone(dns_zonemgr_t *zmgr, dns_zone_t *zone) {
isc_boolean_t free_now = ISC_FALSE;
REQUIRE(DNS_ZONE_VALID(zone));
RWLOCK(&zmgr->rwlock, isc_rwlocktype_write);
LOCK(&zone->lock);
ISC_LIST_UNLINK(zmgr->zones, zone, link);
zone->zmgr = NULL;
zmgr->refs--;
if (zmgr->refs == 0)
free_now = ISC_TRUE;
UNLOCK(&zone->lock);
RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write);
if (free_now)
zonemgr_free(zmgr);
}
void
dns_zonemgr_detach(dns_zonemgr_t **zmgrp) {
dns_zonemgr_t *zmgr = *zmgrp;
isc_boolean_t free_now = ISC_FALSE;
RWLOCK(&zmgr->rwlock, isc_rwlocktype_write);
zmgr->refs--;
if (zmgr->refs == 0)
free_now = ISC_TRUE;
RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_write);
if (free_now)
zonemgr_free(zmgr);
}
isc_result_t
dns_zonemgr_forcemaint(dns_zonemgr_t *zmgr) {
dns_zone_t *p;
RWLOCK(&zmgr->rwlock, isc_rwlocktype_read);
for (p = ISC_LIST_HEAD(zmgr->zones);
p != NULL;
p = ISC_LIST_NEXT(p, link))
{
dns_zone_maintenance(p);
}
RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_read);
return (ISC_R_SUCCESS);
}
void
dns_zonemgr_shutdown(dns_zonemgr_t *zmgr) {
isc_ratelimiter_shutdown(zmgr->rl);
}
static void
zonemgr_free(dns_zonemgr_t *zmgr) {
isc_mem_t *mctx;
INSIST(zmgr->refs == 0);
INSIST(ISC_LIST_EMPTY(zmgr->zones));
if (zmgr->task != NULL)
isc_task_destroy(&zmgr->task);
if (zmgr->zonetasks != NULL)
isc_taskpool_destroy(&zmgr->zonetasks);
isc_ratelimiter_destroy(&zmgr->rl);
isc_rwlock_destroy(&zmgr->conflock);
isc_rwlock_destroy(&zmgr->rwlock);
mctx = zmgr->mctx;
isc_mem_put(zmgr->mctx, zmgr, sizeof *zmgr);
isc_mem_detach(&mctx);
}
void
dns_zonemgr_lockconf(dns_zonemgr_t *zmgr, isc_rwlocktype_t type) {
RWLOCK(&zmgr->conflock, type);
}
void
dns_zonemgr_unlockconf(dns_zonemgr_t *zmgr, isc_rwlocktype_t type) {
RWUNLOCK(&zmgr->conflock, type);
}
void
dns_zonemgr_settransfersin(dns_zonemgr_t *zmgr, int value) {
zmgr->transfersin = value;
}
int
dns_zonemgr_getttransfersin(dns_zonemgr_t *zmgr) {
return (zmgr->transfersin);
}
void
dns_zonemgr_settransfersperns(dns_zonemgr_t *zmgr, int value) {
zmgr->transfersperns = value;
}
int
dns_zonemgr_getttransfersperns(dns_zonemgr_t *zmgr) {
return (zmgr->transfersperns);
}
/*
* Try to start a new incoming zone transfer to fill a quota
* slot that was just vacated.
*
* Requires:
* The zone manager is locked by the caller.
*/
static void
zmgr_resume_xfrs(dns_zonemgr_t *zmgr) {
static char me[] = "zmgr_resume_xfrs";
dns_zone_t *zone;
for (zone = ISC_LIST_HEAD(zmgr->waiting_for_xfrin);
zone != NULL;
zone = ISC_LIST_NEXT(zone, statelink))
{
isc_result_t result;
result = zmgr_start_xfrin_ifquota(zmgr, zone);
if (result == ISC_R_SUCCESS) {
/*
* We successfully filled the slot. We're done.
*/
break;
} else if (result == ISC_R_QUOTA) {
/*
* Not enough quota. This is probably the per-server
* quota, because we only get called when a unit of
* global quota has just been freed. Try the next
* zone, it may succeed if it uses another master.
*/
continue;
} else {
zone_log(zone, me, ISC_LOG_DEBUG(3),
"starting zone transfer: %s",
isc_result_totext(result));
break;
}
}
}
/*
* Try to start an incoming zone transfer for 'zone', quota permitting.
*
* Requires:
* The zone manager is locked by the caller.
*
* Returns:
* ISC_R_SUCCESS There was enough quota and we attempted to
* start a transfer. zone_xfrdone() has been or will
* be called.
* ISC_R_QUOTA Not enough quota.
* Others Failure.
*/
static isc_result_t
zmgr_start_xfrin_ifquota(dns_zonemgr_t *zmgr, dns_zone_t *zone) {
dns_peer_t *peer = NULL;
isc_netaddr_t masterip;
int nxfrsin, nxfrsperns;
dns_zone_t *x;
int maxtransfersin, maxtransfersperns;
isc_event_t *e;
/*
* Find any configured information about the server we'd
* like to transfer this zone from.
*/
isc_netaddr_fromsockaddr(&masterip, &zone->masteraddr);
(void)dns_peerlist_peerbyaddr(zone->view->peers,
&masterip, &peer);
/*
* Determine the total maximum number of simultaneous
* transfers allowed, and the maximum for this specific
* master.
*/
maxtransfersin = zmgr->transfersin;
maxtransfersperns = zmgr->transfersperns;
if (peer != NULL)
(void)dns_peer_gettransfers(peer, &maxtransfersperns);
/*
* Count the total number of transfers that are in progress,
* and the number of transfers in progress from this master.
* We linearly scan a list of all transfers; if this turns
* out to be too slow, we could hash on the master address.
*/
nxfrsin = nxfrsperns = 0;
for (x = ISC_LIST_HEAD(zmgr->xfrin_in_progress);
x != NULL;
x = ISC_LIST_NEXT(x, statelink))
{
isc_netaddr_t xip;
isc_netaddr_fromsockaddr(&xip, &x->masteraddr);
nxfrsin++;
if (isc_netaddr_equal(&xip, &masterip))
nxfrsperns++;
}
/* Enforce quota. */
if (nxfrsin >= maxtransfersin)
return (ISC_R_QUOTA);
if (nxfrsperns >= maxtransfersperns)
return (ISC_R_QUOTA);
/*
* We have sufficient quota. Move the zone to the "xfrin_in_progress"
* list and send it an event to let it start the actual transfer in the
* context of its own task.
*/
e = isc_event_allocate(zmgr->mctx, zmgr,
DNS_EVENT_ZONESTARTXFRIN,
got_transfer_quota, zone,
sizeof(isc_event_t));
if (e == NULL)
return (ISC_R_NOMEMORY);
LOCK(&zone->lock);
INSIST(zone->statelist == &zmgr->waiting_for_xfrin);
ISC_LIST_UNLINK(zmgr->waiting_for_xfrin, zone, statelink);
ISC_LIST_APPEND(zmgr->xfrin_in_progress, zone, statelink);
zone->statelist = &zmgr->xfrin_in_progress;
/*
* Make sure the zone does not go away before it has processed
* the event; in effect, the event is attached to the zone.
*
* XXXAG This should be done as soon as the zone goes on the
* queue, using irefs.
*/
zone->erefs++;
isc_task_send(zone->task, &e);
UNLOCK(&zone->lock);
return (ISC_R_SUCCESS);
}
#if 0
/* Hook for ondestroy notifcation from a database. */
static void
dns_zonemgr_dbdestroyed(isc_task_t *task, isc_event_t *event) {
dns_db_t *db = event->sender;
UNUSED(task);
isc_event_free(&event);
isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
DNS_LOGMODULE_ZONE, ISC_LOG_INFO,
"database (%p) destroyed", (void*) db);
}
#endif
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