server.c revision 8a47ea1dadd3b985f5266f198423e01e225e218d
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley/*
ca41b452ede6feaa9d8739ec3cae19389a7b0d03Bob Halley * Copyright (C) 1999, 2000 Internet Software Consortium.
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence *
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley * Permission to use, copy, modify, and distribute this software for any
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley * purpose with or without fee is hereby granted, provided that the above
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley * copyright notice and this permission notice appear in all copies.
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence *
15a44745412679c30a6d022733925af70a38b715David Lawrence * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
15a44745412679c30a6d022733925af70a38b715David Lawrence * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
15a44745412679c30a6d022733925af70a38b715David Lawrence * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
15a44745412679c30a6d022733925af70a38b715David Lawrence * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
15a44745412679c30a6d022733925af70a38b715David Lawrence * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
15a44745412679c30a6d022733925af70a38b715David Lawrence * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
15a44745412679c30a6d022733925af70a38b715David Lawrence * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
15a44745412679c30a6d022733925af70a38b715David Lawrence * SOFTWARE.
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley */
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
9cd6d409b78a6f833b681c13a68fbdc7c024fe66David Lawrence#include <config.h>
9c3531d72aeaad6c5f01efe6a1c82023e1379e4dDavid Lawrence
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <stdlib.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <isc/app.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <isc/base64.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <isc/dir.h>
9cd6d409b78a6f833b681c13a68fbdc7c024fe66David Lawrence#include <isc/lex.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <isc/string.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <isc/task.h>
1a69a1a78cfaa86f3b68bbc965232b7876d4da2aDavid Lawrence#include <isc/timer.h>
364a82f7c25b62967678027043425201a5e5171aBob Halley#include <isc/util.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
435532822dc571a904207d8176e063cc8731eef5Bob Halley#include <dns/cache.h>
435532822dc571a904207d8176e063cc8731eef5Bob Halley#include <dns/confparser.h>
435532822dc571a904207d8176e063cc8731eef5Bob Halley#include <dns/db.h>
435532822dc571a904207d8176e063cc8731eef5Bob Halley#include <dns/dispatch.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/journal.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/keytable.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/peer.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/rdatastruct.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/resolver.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/rootns.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/tkey.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/tkeyconf.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/tsigconf.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/view.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/zone.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <dns/zoneconf.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <named/client.h>
dcf8825fd74f3f83b1882af4793270083b125ee5David Lawrence#include <named/interfacemgr.h>
dcf8825fd74f3f83b1882af4793270083b125ee5David Lawrence#include <named/log.h>
dcf8825fd74f3f83b1882af4793270083b125ee5David Lawrence#include <named/logconf.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <named/os.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#include <named/server.h>
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley/*
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley * Check an operation for failure. Assumes that the function
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley * using it has a 'result' variable and a 'cleanup' label.
9cd6d409b78a6f833b681c13a68fbdc7c024fe66David Lawrence */
9cd6d409b78a6f833b681c13a68fbdc7c024fe66David Lawrence#define CHECK(op) \
9cd6d409b78a6f833b681c13a68fbdc7c024fe66David Lawrence do { result = (op); \
9cd6d409b78a6f833b681c13a68fbdc7c024fe66David Lawrence if (result != ISC_R_SUCCESS) goto cleanup; \
9cd6d409b78a6f833b681c13a68fbdc7c024fe66David Lawrence } while (0)
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley#define CHECKM(op, msg) \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley do { result = (op); \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley if (result != ISC_R_SUCCESS) { \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley isc_log_write(ns_g_lctx, \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley NS_LOGCATEGORY_GENERAL, \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley NS_LOGMODULE_SERVER, \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley ISC_LOG_ERROR, \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley "%s: %s", msg, \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley isc_result_totext(result)); \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley goto cleanup; \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley } \
eb2c85b103e3fccebddf59619216ba26af98bcd1Bob Halley } while (0) \
f3f22040a8c4835227e1a3abc54454556d4c47abBrian Wellington
ece3d6c35693f9e2145434b0bf14e8b752cdeee8Michael Graff#define CHECKFATAL(op, msg) \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley do { result = (op); \
ece3d6c35693f9e2145434b0bf14e8b752cdeee8Michael Graff if (result != ISC_R_SUCCESS) \
ece3d6c35693f9e2145434b0bf14e8b752cdeee8Michael Graff fatal(msg, result); \
ece3d6c35693f9e2145434b0bf14e8b752cdeee8Michael Graff } while (0) \
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
f3f22040a8c4835227e1a3abc54454556d4c47abBrian Wellingtontypedef struct {
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley isc_mem_t * mctx;
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley dns_viewlist_t viewlist;
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley dns_aclconfctx_t *aclconf;
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley} ns_load_t;
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halleystatic void fatal(char *msg, isc_result_t result);
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halleystatic void ns_server_reload(isc_task_t *task, isc_event_t *event);
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
2f3cfa8c0212e47f92f6c45459d9ee0ba8aa0045Bob Halleystatic isc_result_t
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halleyns_listenelt_fromconfig(dns_c_lstnon_t *celt, dns_c_ctx_t *cctx,
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley dns_aclconfctx_t *actx,
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley isc_mem_t *mctx, ns_listenelt_t **target);
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halleystatic isc_result_t
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halleyns_listenlist_fromconfig(dns_c_lstnlist_t *clist, dns_c_ctx_t *cctx,
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley dns_aclconfctx_t *actx,
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley isc_mem_t *mctx, ns_listenlist_t **target);
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley/*
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley * Configure a single view ACL at '*aclp'. Get its configuration by
2f3cfa8c0212e47f92f6c45459d9ee0ba8aa0045Bob Halley * calling 'getvcacl' (for per-view configuration) and maybe 'getscacl'
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley * (for a global default).
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley */
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halleystatic isc_result_t
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halleyconfigure_view_acl(dns_c_view_t *cview,
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley dns_c_ctx_t *cctx,
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley dns_aclconfctx_t *actx, isc_mem_t *mctx,
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley isc_result_t (*getvcacl)
e08daafffce8fb74ffca8ecf5772e334299ccf76Bob Halley (dns_c_view_t *, dns_c_ipmatchlist_t **),
isc_result_t (*getscacl)
(dns_c_ctx_t *, dns_c_ipmatchlist_t **),
dns_acl_t **aclp)
{
isc_result_t result;
dns_c_ipmatchlist_t *cacl = NULL;
if (*aclp != NULL)
dns_acl_detach(aclp);
if (getvcacl != NULL && cview != NULL)
(void) (*getvcacl)(cview, &cacl);
if (cacl == NULL && getscacl != NULL)
(void) (*getscacl)(cctx, &cacl);
if (cacl == NULL) {
/* No value available. *aclp == NULL. */
return (ISC_R_SUCCESS);
}
result = dns_acl_fromconfig(cacl, cctx, actx, mctx, aclp);
dns_c_ipmatchlist_detach(&cacl);
return (result);
}
/*
* Convert a null-terminated string of base64 text into
* binary, storing it in a buffer.
* 'mctx' is only used internally.
*/
static isc_result_t
base64_cstring_tobuffer(isc_mem_t *mctx, char *cstr, isc_buffer_t *target)
{
isc_result_t result;
isc_buffer_t source;
isc_lex_t *lex = NULL;
isc_boolean_t isopen = ISC_FALSE;
isc_buffer_init(&source, cstr, strlen(cstr));
isc_buffer_add(&source, strlen(cstr));
CHECK(isc_lex_create(mctx, 256, &lex));
CHECK(isc_lex_openbuffer(lex, &source));
isopen = ISC_TRUE;
CHECK(isc_base64_tobuffer(lex, target, -1));
cleanup:
if (isopen)
(void) isc_lex_close(lex);
if (lex != NULL)
isc_lex_destroy(&lex);
return (result);
}
/*
* Configure the trusted keys or security roots of a view.
* The configuration values are read from 'cctx' and 'cview' using
* the function 'cget'. The variable to be configured is '*target'.
* XXX not really view specific yet
*/
static isc_result_t
configure_view_dnsseckeys(dns_c_ctx_t *cctx,
dns_c_view_t *cview,
isc_mem_t *mctx,
isc_result_t (*cget)
(dns_c_ctx_t *, dns_c_tkeylist_t **),
dns_keytable_t **target)
{
isc_result_t result;
dns_c_tkeylist_t *ckeys = NULL;
dns_c_tkey_t *ckey;
dns_keytable_t *keytable = NULL;
dst_key_t *dstkey = NULL;
CHECK(dns_keytable_create(mctx, &keytable));
result = (*cget)(cctx, &ckeys);
if (result == ISC_R_SUCCESS) {
for (ckey = ISC_LIST_HEAD(ckeys->tkeylist);
ckey != NULL;
ckey = ISC_LIST_NEXT(ckey, next))
{
dns_rdataclass_t viewclass;
dns_rdata_key_t keystruct;
isc_int32_t flags, proto, alg;
unsigned char keydata[4096];
isc_buffer_t keydatabuf;
unsigned char rrdata[4096];
isc_buffer_t rrdatabuf;
isc_region_t r;
if (cview == NULL)
viewclass = dns_rdataclass_in;
else
CHECK(dns_c_view_getviewclass(cview,
&viewclass));
keystruct.common.rdclass = viewclass;
keystruct.common.rdtype = dns_rdatatype_key;
/*
* The key data in keystruct is not
* dynamically allocated.
*/
keystruct.mctx = NULL;
ISC_LINK_INIT(&keystruct.common, link);
flags = ckey->pubkey->flags;
proto = ckey->pubkey->protocol;
alg = ckey->pubkey->algorithm;
if (flags < 0 || flags > 0xffff)
CHECKM(DNS_R_RANGE, "key flags");
if (proto < 0 || proto > 0xff)
CHECKM(DNS_R_RANGE, "key protocol");
if (alg < 0 || alg > 0xff)
CHECKM(DNS_R_RANGE, "key algorithm");
keystruct.flags = flags;
keystruct.protocol = proto;
keystruct.algorithm = alg;
isc_buffer_init(&keydatabuf, keydata, sizeof(keydata));
isc_buffer_init(&rrdatabuf, rrdata, sizeof(rrdata));
CHECK(base64_cstring_tobuffer(mctx, ckey->pubkey->key,
&keydatabuf));
isc_buffer_usedregion(&keydatabuf, &r);
keystruct.datalen = r.length;
keystruct.data = r.base;
CHECK(dns_rdata_fromstruct(NULL,
keystruct.common.rdclass,
keystruct.common.rdtype,
&keystruct, &rrdatabuf));
CHECK(dst_key_fromdns(ckey->domain, &rrdatabuf, mctx,
&dstkey));
CHECK(dns_keytable_add(keytable, &dstkey));
INSIST(dstkey == NULL);
}
} else if (result != ISC_R_NOTFOUND)
goto cleanup;
dns_keytable_detach(target);
*target = keytable; /* Transfer ownership. */
keytable = NULL;
result = ISC_R_SUCCESS;
cleanup:
if (dstkey != NULL)
dst_key_free(dstkey);
return (result);
}
/*
* Configure 'view' according to 'cview', taking defaults from 'cctx'
* where values are missing in cctx.
*
* When configuring the default view, cctx will be NULL and the
* glboal defaults in cview used exclusively.
*/
static isc_result_t
configure_view(dns_view_t *view, dns_c_ctx_t *cctx, dns_c_view_t *cview,
isc_mem_t *mctx, dns_aclconfctx_t *actx,
dns_dispatch_t *dispatchv4, dns_dispatch_t *dispatchv6)
{
dns_cache_t *cache = NULL;
isc_result_t result;
isc_int32_t cleaning_interval;
dns_tsig_keyring_t *ring;
dns_c_forw_t forward;
dns_c_iplist_t *forwarders;
dns_fwdpolicy_t fwdpolicy;
isc_sockaddrlist_t addresses;
isc_sockaddr_t *sa, *next_sa;
dns_view_t *pview = NULL; /* Production view */
unsigned int i;
isc_mem_t *cmctx;
REQUIRE(DNS_VIEW_VALID(view));
ISC_LIST_INIT(addresses);
cmctx = NULL;
RWLOCK(&view->conflock, isc_rwlocktype_write);
/*
* Configure the view's cache. Try to reuse an existing
* cache if possible, otherwise create a new cache.
* Note that the ADB is not preserved in either case.
*
* XXX Determining when it is safe to reuse a cache is
* tricky. When the view's configuration changes, the cached
* data may become invalid because it reflects our old
* view of the world. As more view attributes become
* configurable, we will have to add code here to check
* whether they have changed in ways that could
* invalidate the cache.
*/
result = dns_viewlist_find(&ns_g_server->viewlist,
view->name, view->rdclass,
&pview);
if (result != ISC_R_NOTFOUND && result != ISC_R_SUCCESS)
goto cleanup;
if (pview != NULL) {
INSIST(pview->cache != NULL);
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER,
ISC_LOG_DEBUG(3), "reusing existing cache");
dns_cache_attach(pview->cache, &cache);
dns_view_detach(&pview);
} else {
CHECK(isc_mem_create(0, 0, &cmctx));
CHECK(dns_cache_create(cmctx, ns_g_taskmgr, ns_g_timermgr,
view->rdclass, "rbt", 0, NULL, &cache));
}
dns_view_setcache(view, cache);
result = ISC_R_NOTFOUND;
if (cview != NULL)
result = dns_c_view_getcleaninterval(cview,
&cleaning_interval);
if (result != ISC_R_SUCCESS)
result = dns_c_ctx_getcleaninterval(cctx, &cleaning_interval);
if (result != ISC_R_SUCCESS)
cleaning_interval = 3600; /* Default is 1 hour. */
dns_cache_setcleaninginterval(cache, cleaning_interval);
dns_cache_detach(&cache);
/*
* XXXRTH Temporary support for loading cache contents.
*/
if (ns_g_cachefile != NULL) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER,
ISC_LOG_DEBUG(1), "loading cache '%s'",
ns_g_cachefile);
CHECK(dns_db_load(view->cachedb, ns_g_cachefile));
}
/*
* Resolver.
*
* XXXRTH Hardwired number of tasks.
*/
CHECK(dns_view_createresolver(view, ns_g_taskmgr, 31,
ns_g_socketmgr, ns_g_timermgr,
0, dispatchv4, dispatchv6));
/*
* Set resolver forwarding policy.
*/
if ((cview != NULL &&
dns_c_view_getforwarders(cview, &forwarders) == ISC_R_SUCCESS) ||
(dns_c_ctx_getforwarders(cctx, &forwarders) == ISC_R_SUCCESS))
{
fwdpolicy = dns_fwdpolicy_first;
/*
* Ugh. Convert between list formats.
*/
for (i = 0; i < forwarders->nextidx; i++) {
sa = isc_mem_get(view->mctx, sizeof *sa);
if (sa == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
*sa = forwarders->ips[i];
isc_sockaddr_setport(sa, 53);
ISC_LINK_INIT(sa, link);
ISC_LIST_APPEND(addresses, sa, link);
}
INSIST(!ISC_LIST_EMPTY(addresses));
dns_c_iplist_detach(&forwarders);
CHECK(dns_resolver_setforwarders(view->resolver, &addresses));
/*
* XXXRTH The configuration type 'dns_c_forw_t' should be
* elminated.
*/
if ((cview != NULL &&
dns_c_view_getforward(cview, &forward) == ISC_R_SUCCESS) ||
(dns_c_ctx_getforward(cctx, &forward) == ISC_R_SUCCESS)) {
INSIST(forward == dns_c_forw_first ||
forward == dns_c_forw_only);
if (forward == dns_c_forw_only)
fwdpolicy = dns_fwdpolicy_only;
}
CHECK(dns_resolver_setfwdpolicy(view->resolver, fwdpolicy));
}
/*
* We have default hints for class IN if we need them.
*/
if (view->rdclass == dns_rdataclass_in && view->hints == NULL)
dns_view_sethints(view, ns_g_server->in_roothints);
/*
* If we still have no hints, this is a non-IN view with no
* "hints zone" configured. That's an error.
*/
if (view->hints == NULL) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
"no root hints for view '%s'",
cview == NULL ? "<default>" : cview->name);
result = ISC_R_FAILURE;
goto cleanup;
}
/*
* Configure the view's TSIG keys.
*/
ring = NULL;
CHECK(dns_tsigkeyring_fromconfig(cctx, view->mctx, &ring));
dns_view_setkeyring(view, ring);
/*
* Configure the view's peer list.
*/
{
dns_peerlist_t *newpeers = NULL;
if (cctx->peers != NULL) {
dns_peerlist_attach(cctx->peers, &newpeers);
} else {
CHECK(dns_peerlist_new(mctx, &newpeers));
}
dns_peerlist_detach(&view->peers);
view->peers = newpeers; /* Transfer ownership. */
}
/*
* Configure the "match-clients" ACL.
*/
CHECK(configure_view_acl(cview, cctx, actx, ns_g_mctx,
dns_c_view_getmatchclients, NULL,
&view->matchclients));
/*
* Configure other configurable data.
*/
view->recursion = ISC_TRUE;
(void) dns_c_ctx_getrecursion(cctx, &view->recursion);
if (cview != NULL)
(void) dns_c_view_getrecursion(cview, &view->recursion);
view->auth_nxdomain = ISC_FALSE; /* Was true in BIND 8 */
(void) dns_c_ctx_getauthnxdomain(cctx, &view->auth_nxdomain);
if (cview != NULL)
(void) dns_c_view_getauthnxdomain(cview, &view->auth_nxdomain);
view->transfer_format = dns_one_answer;
(void) dns_c_ctx_gettransferformat(cctx, &view->transfer_format);
if (cview != NULL)
(void) dns_c_view_gettransferformat(cview,
&view->transfer_format);
CHECK(configure_view_acl(cview, cctx, actx, ns_g_mctx,
dns_c_view_getallowquery,
dns_c_ctx_getallowquery,
&view->queryacl));
CHECK(configure_view_acl(cview, cctx, actx, ns_g_mctx,
dns_c_view_getrecursionacl,
dns_c_ctx_getallowrecursion,
&view->recursionacl));
result = ISC_R_NOTFOUND;
if (cview != NULL)
result = dns_c_view_getrequestixfr(cview, &view->requestixfr);
if (result != ISC_R_SUCCESS)
result = dns_c_ctx_getrequestixfr(cctx, &view->requestixfr);
if (result != ISC_R_SUCCESS)
view->requestixfr = ISC_TRUE;
result = ISC_R_NOTFOUND;
if (cview != NULL)
result = dns_c_view_getprovideixfr(cview, &view->provideixfr);
if (result != ISC_R_SUCCESS)
result = dns_c_ctx_getprovideixfr(cctx, &view->provideixfr);
if (result != ISC_R_SUCCESS)
view->provideixfr = ISC_TRUE;
/*
* For now, there is only one kind of trusted keys, the
* "security roots".
*/
CHECK(configure_view_dnsseckeys(cctx, cview, mctx,
dns_c_ctx_gettrustedkeys,
&view->secroots));
result = ISC_R_SUCCESS;
cleanup:
RWUNLOCK(&view->conflock, isc_rwlocktype_write);
for (sa = ISC_LIST_HEAD(addresses);
sa != NULL;
sa = next_sa) {
next_sa = ISC_LIST_NEXT(sa, link);
isc_mem_put(view->mctx, sa, sizeof *sa);
}
if (cmctx != NULL)
isc_mem_detach(&cmctx);
return (result);
}
/*
* Create the special view that handles queries for
* "version.bind. CH". The version string returned is that
* configured in 'cctx', or a compiled-in default if
* there is no "version" configuration option.
*/
static isc_result_t
create_version_view(dns_c_ctx_t *cctx, dns_view_t **viewp) {
isc_result_t result;
dns_db_t *db = NULL;
dns_zone_t *zone = NULL;
dns_dbversion_t *dbver = NULL;
dns_difftuple_t *tuple = NULL;
dns_diff_t diff;
dns_view_t *view = NULL;
char *versiontext;
unsigned char buf[256];
isc_region_t r;
size_t len;
dns_rdata_t rdata;
static unsigned char origindata[] = "\007version\004bind";
dns_name_t origin;
REQUIRE(viewp != NULL && *viewp == NULL);
dns_diff_init(ns_g_mctx, &diff);
dns_name_init(&origin, NULL);
r.base = origindata;
r.length = sizeof(origindata);
dns_name_fromregion(&origin, &r);
(void) dns_c_ctx_getversion(cctx, &versiontext);
if (versiontext == NULL)
versiontext = ns_g_version;
len = strlen(versiontext);
if (len > 255)
len = 255; /* Silently truncate. */
buf[0] = len;
memcpy(buf + 1, versiontext, len);
r.base = buf;
r.length = 1 + len;
dns_rdata_fromregion(&rdata, dns_rdataclass_ch, dns_rdatatype_txt, &r);
CHECK(dns_zone_create(&zone, ns_g_mctx));
CHECK(dns_zone_setorigin(zone, &origin));
CHECK(dns_db_create(ns_g_mctx, "rbt", &origin, ISC_FALSE,
dns_rdataclass_ch, 0, NULL, &db));
CHECK(dns_db_newversion(db, &dbver));
CHECK(dns_difftuple_create(ns_g_mctx, DNS_DIFFOP_ADD, &origin,
0, &rdata, &tuple));
dns_diff_append(&diff, &tuple);
CHECK(dns_diff_apply(&diff, db, dbver));
dns_db_closeversion(db, &dbver, ISC_TRUE);
CHECK(dns_view_create(ns_g_mctx, dns_rdataclass_ch, "_version",
&view));
CHECK(dns_zone_replacedb(zone, db, ISC_FALSE));
CHECK(dns_view_addzone(view, zone));
dns_view_freeze(view);
/* Transfer ownership. */
*viewp = view;
view = NULL;
result = ISC_R_SUCCESS;
cleanup:
if (view != NULL)
dns_view_detach(&view);
if (zone != NULL)
dns_zone_detach(&zone);
if (dbver != NULL)
dns_db_closeversion(db, &dbver, ISC_FALSE);
if (db != NULL)
dns_db_detach(&db);
dns_diff_clear(&diff);
return (result);
}
static isc_result_t
configure_hints(dns_view_t *view, const char *filename) {
isc_result_t result;
dns_db_t *db;
db = NULL;
result = dns_rootns_create(view->mctx, view->rdclass, filename, &db);
if (result == ISC_R_SUCCESS) {
dns_view_sethints(view, db);
dns_db_detach(&db);
}
return (result);
}
/*
* Find an existing view matching the name and class of 'cview'
* in 'viewlist', or create a new one and add it to the list.
*
* If 'cview' is NULL, find or create the default view.
*
* The view found or created is attached to '*viewp'.
*/
static isc_result_t
find_or_create_view(dns_c_view_t *cview, dns_viewlist_t *viewlist,
dns_view_t **viewp)
{
isc_result_t result;
char *viewname;
dns_rdataclass_t viewclass;
dns_view_t *view = NULL;
if (cview != NULL) {
viewname = cview->name;
result = dns_c_view_getviewclass(cview, &viewclass);
if (result != ISC_R_SUCCESS)
return (result);
} else {
viewname = "_default";
viewclass = dns_rdataclass_in;
}
result = dns_viewlist_find(viewlist, viewname,
viewclass, &view);
if (result == ISC_R_SUCCESS) {
*viewp = view;
return (ISC_R_SUCCESS);
}
if (result != ISC_R_NOTFOUND)
return (result);
INSIST(view == NULL);
result = dns_view_create(ns_g_mctx, viewclass, viewname, &view);
if (result != ISC_R_SUCCESS)
return (result);
ISC_LIST_APPEND(*viewlist, view, link);
dns_view_attach(view, viewp);
return (ISC_R_SUCCESS);
}
/*
* Configure or reconfigure a zone. This callback function
* is called after parsing each "zone" statement in named.conf.
*/
static isc_result_t
configure_zone(dns_c_ctx_t *cctx, dns_c_zone_t *czone, dns_c_view_t *cview,
void *uap)
{
ns_load_t *lctx = (ns_load_t *) uap;
dns_view_t *view = NULL; /* New view */
dns_view_t *pview = NULL; /* Production view */
dns_zone_t *zone = NULL; /* New or reused zone */
dns_zone_t *tzone = NULL; /* Temporary zone */
isc_result_t result;
char *corigin;
isc_buffer_t buffer;
dns_fixedname_t fixorigin;
dns_name_t *origin;
/*
* Get the zone origin as a dns_name_t.
*/
corigin = NULL;
/* XXX casting away const */
CHECK(dns_c_zone_getname(czone, (const char **) &corigin));
isc_buffer_init(&buffer, corigin, strlen(corigin));
isc_buffer_add(&buffer, strlen(corigin));
dns_fixedname_init(&fixorigin);
CHECK(dns_name_fromtext(dns_fixedname_name(&fixorigin),
&buffer, dns_rootname, ISC_FALSE, NULL));
origin = dns_fixedname_name(&fixorigin);
/*
* Find or create the view in the new view list.
*/
view = NULL;
CHECK(find_or_create_view(cview, &lctx->viewlist, &view));
if (czone->zclass != view->rdclass) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
"zone '%s': wrong class for view '%s'",
corigin, cview ? cview->name : "<default view>");
result = ISC_R_FAILURE;
goto cleanup;
}
/*
* Master zones must have 'file' set.
*/
if (czone->ztype == dns_c_zone_master &&
czone->u.mzone.file == NULL) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
"zone '%s': 'file' not specified",
corigin);
result = ISC_R_FAILURE;
goto cleanup;
}
/*
* "hints zones" aren't zones. If we've got one,
* configure it and return.
*/
if (czone->ztype == dns_c_zone_hint) {
if (czone->u.hzone.file == NULL) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
"zone '%s': 'file' not specified",
corigin);
result = ISC_R_FAILURE;
goto cleanup;
}
if (dns_name_equal(origin, dns_rootname)) {
result = configure_hints(view, czone->u.hzone.file);
} else {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
"ignoring non-root hint zone '%s'",
corigin);
result = ISC_R_SUCCESS;
}
goto cleanup;
}
/*
* "stub zones" aren't zones either. Eventually we'll
* create a "cache freshener" to keep the stub data in the
* cache.
*/
if (czone->ztype == dns_c_zone_stub) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
"stub zone '%s': stub zones are not supported in this release",
corigin);
result = ISC_R_SUCCESS;
goto cleanup;
}
/*
* "forward zones" aren't zones either. Eventually we'll
* translate this syntax into the appropriate selective forwarding
* configuration.
*/
if (czone->ztype == dns_c_zone_forward) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
"forward zone '%s': forward zones are not supported in this release",
corigin);
result = ISC_R_SUCCESS;
goto cleanup;
}
/*
* Check for duplicates in the new zone table.
*/
result = dns_view_findzone(view, origin, &tzone);
if (result == ISC_R_SUCCESS) {
/*
* We already have this zone!
*/
result = ISC_R_EXISTS;
goto cleanup;
}
/*
* See if we can reuse an existing zone. This is
* only possible if all of these are true:
* - The zone's view exists
* - A zone with the right name exists in the view
* - The zone is compatible with the config
* options (e.g., an existing master zone cannot
* be reused if the options specify a slave zone)
*/
result = dns_viewlist_find(&ns_g_server->viewlist,
view->name, view->rdclass,
&pview);
if (result != ISC_R_NOTFOUND && result != ISC_R_SUCCESS)
goto cleanup;
if (pview != NULL)
result = dns_view_findzone(pview, origin, &zone);
if (result != ISC_R_NOTFOUND && result != ISC_R_SUCCESS)
goto cleanup;
if (zone != NULL) {
if (! dns_zone_reusable(zone, czone))
dns_zone_detach(&zone);
}
/*
* If we cannot reuse an existing zone, we will have to
* create a new one.
*/
if (zone == NULL) {
CHECK(dns_zone_create(&zone, lctx->mctx));
CHECK(dns_zone_setorigin(zone, origin));
CHECK(dns_zonemgr_managezone(ns_g_server->zonemgr,
zone));
}
/*
* Configure the zone.
*/
CHECK(dns_zone_configure(cctx, cview, czone, lctx->aclconf, zone));
/*
* Add the zone to its view in the new view list.
*/
CHECK(dns_view_addzone(view, zone));
cleanup:
if (tzone != NULL)
dns_zone_detach(&tzone);
if (zone != NULL)
dns_zone_detach(&zone);
if (pview != NULL)
dns_view_detach(&pview);
if (view != NULL)
dns_view_detach(&view);
return (result);
}
/*
* Configure a single server quota.
*/
static void
configure_server_quota(dns_c_ctx_t *cctx,
isc_result_t (*getquota)(dns_c_ctx_t *, isc_int32_t *),
isc_quota_t *quota, int defaultvalue)
{
isc_int32_t val = defaultvalue;
(void)(*getquota)(cctx, &val);
quota->max = val;
}
static isc_result_t
configure_server_querysource(dns_c_ctx_t *cctx, ns_server_t *server, int af,
dns_dispatch_t **dispatchp) {
isc_result_t result;
struct in_addr ina;
isc_sockaddr_t sa, any4, any6, *any;
isc_socket_t *socket;
dns_dispatch_t **server_dispatchp;
isc_sockaddr_t *server_dispatchaddr;
/*
* Make compiler happy.
*/
result = ISC_R_FAILURE;
any = NULL;
server_dispatchp = NULL;
server_dispatchaddr = NULL;
ina.s_addr = htonl(INADDR_ANY);
isc_sockaddr_fromin(&any4, &ina, 0);
isc_sockaddr_fromin6(&any6, &in6addr_any, 0);
*dispatchp = NULL;
switch (af) {
case AF_INET:
any = &any4;
result = dns_c_ctx_getquerysource(cctx, &sa);
break;
case AF_INET6:
any = &any6;
result = dns_c_ctx_getquerysourcev6(cctx, &sa);
break;
default:
INSIST(0);
}
if (result != ISC_R_SUCCESS)
sa = *any;
INSIST(isc_sockaddr_pf(&sa) == af);
/*
* If we don't support this address family, we're done!
*/
switch (af) {
case AF_INET:
result = isc_net_probeipv4();
break;
case AF_INET6:
result = isc_net_probeipv6();
break;
default:
INSIST(0);
}
if (result != ISC_R_SUCCESS)
return (ISC_R_SUCCESS);
if (isc_sockaddr_equal(&sa, any)) {
/*
* The query source is fully wild. No special dispatcher
* work needs to be done.
*/
return (ISC_R_SUCCESS);
}
/*
* If the interface manager has a dispatcher for this address,
* use it.
*/
switch (af) {
case AF_INET:
server_dispatchp = &server->querysrc_dispatchv4;
server_dispatchaddr = &server->querysrc_addressv4;
break;
case AF_INET6:
server_dispatchp = &server->querysrc_dispatchv6;
server_dispatchaddr = &server->querysrc_addressv6;
break;
default:
INSIST(0);
}
if (ns_interfacemgr_findudpdispatcher(server->interfacemgr, &sa,
dispatchp) !=
ISC_R_SUCCESS) {
/*
* The interface manager doesn't have a matching dispatcher.
*/
if (*server_dispatchp != NULL) {
/*
* We've already got a custom dispatcher. If it is
* compatible with the new configuration, use it.
*/
if (isc_sockaddr_equal(server_dispatchaddr,
&sa)) {
dns_dispatch_attach(*server_dispatchp,
dispatchp);
return (ISC_R_SUCCESS);
}
/*
* The existing custom dispatcher is not compatible.
* We don't need it anymore.
*/
dns_dispatch_detach(server_dispatchp);
}
/*
* Create a custom dispatcher.
*/
INSIST(*server_dispatchp == NULL);
*server_dispatchaddr = sa;
socket = NULL;
result = isc_socket_create(ns_g_socketmgr, af,
isc_sockettype_udp,
&socket);
if (result != ISC_R_SUCCESS)
return (result);
result = isc_socket_bind(socket, &sa);
if (result != ISC_R_SUCCESS) {
isc_socket_detach(&socket);
return (result);
}
result = dns_dispatch_create(ns_g_mctx, socket,
server->task, 4096,
1000, 32768, 16411, 16433, NULL,
server_dispatchp);
/*
* Regardless of whether dns_dispatch_create() succeeded or
* failed, we don't need to keep the reference to the socket.
*/
isc_socket_detach(&socket);
if (result != ISC_R_SUCCESS)
return (result);
dns_dispatch_attach(*server_dispatchp, dispatchp);
} else {
/*
* We're sharing a UDP dispatcher with the interface manager
* now. Any prior custom dispatcher can be discarded.
*/
if (*server_dispatchp != NULL)
dns_dispatch_detach(server_dispatchp);
}
return (ISC_R_SUCCESS);
}
/*
* This function is called as soon as the 'options' statement has been
* parsed.
*/
static isc_result_t
options_callback(dns_c_ctx_t *cctx, void *uap) {
isc_result_t result;
UNUSED(uap);
/*
* Change directory.
*/
if (cctx->options != NULL &&
cctx->options->directory != NULL) {
result = isc_dir_chdir(cctx->options->directory);
if (result != ISC_R_SUCCESS) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER,
ISC_LOG_ERROR, "change directory "
"to '%s' failed: %s",
cctx->options->directory,
isc_result_totext(result));
return (result);
}
}
return (ISC_R_SUCCESS);
}
static void
scan_interfaces(ns_server_t *server) {
ns_interfacemgr_scan(server->interfacemgr);
dns_aclenv_copy(&server->aclenv,
ns_interfacemgr_getaclenv(server->interfacemgr));
}
/*
* This event callback is invoked to do periodic network
* interface scanning.
*/
static void
interface_timer_tick(isc_task_t *task, isc_event_t *event) {
ns_server_t *server = (ns_server_t *) event->ev_arg;
UNUSED(task);
isc_event_free(&event);
RWLOCK(&server->conflock, isc_rwlocktype_write);
scan_interfaces(server);
RWUNLOCK(&server->conflock, isc_rwlocktype_write);
}
static isc_result_t
load_configuration(const char *filename, ns_server_t *server,
isc_boolean_t first_time)
{
isc_result_t result;
ns_load_t lctx;
dns_c_cbks_t callbacks;
dns_c_ctx_t *cctx;
dns_view_t *view = NULL;
dns_view_t *view_next;
dns_viewlist_t tmpviewlist;
dns_aclconfctx_t aclconfctx;
dns_dispatch_t *dispatchv4 = NULL;
dns_dispatch_t *dispatchv6 = NULL;
char *pidfilename;
isc_int32_t interface_interval;
dns_aclconfctx_init(&aclconfctx);
RWLOCK(&server->conflock, isc_rwlocktype_write);
dns_zonemgr_lockconf(server->zonemgr, isc_rwlocktype_write);
lctx.mctx = ns_g_mctx;
lctx.aclconf = &aclconfctx;
ISC_LIST_INIT(lctx.viewlist);
callbacks.zonecbk = configure_zone;
callbacks.zonecbkuap = &lctx;
callbacks.optscbk = options_callback;
callbacks.optscbkuap = NULL;
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
ISC_LOG_INFO, "loading configuration from '%s'",
filename);
/*
* Parse the configuration file creating a parse tree. Any
* 'zone' statements are handled immediately by calling
* configure_zone() through 'callbacks'.
*/
cctx = NULL;
CHECK(dns_c_parse_namedconf(filename, ns_g_mctx, &cctx,
&callbacks));
/*
* Configure various server options.
*/
configure_server_quota(cctx, dns_c_ctx_gettransfersout,
&server->xfroutquota, 10);
configure_server_quota(cctx, dns_c_ctx_gettcpclients,
&server->tcpquota, 100);
configure_server_quota(cctx, dns_c_ctx_getrecursiveclients,
&server->recursionquota, 100);
/*
* Configure the zone manager.
*/
{
isc_int32_t transfersin = 10;
(void) dns_c_ctx_gettransfersin(cctx, &transfersin);
dns_zonemgr_settransfersin(server->zonemgr, transfersin);
}
{
isc_int32_t transfersperns = 2;
(void) dns_c_ctx_gettransfersperns(cctx, &transfersperns);
dns_zonemgr_settransfersperns(server->zonemgr, transfersperns);
}
/*
* Configure the interface manager according to the "listen-on"
* statement.
*/
{
dns_c_lstnlist_t *clistenon = NULL;
ns_listenlist_t *listenon = NULL;
(void) dns_c_ctx_getlistenlist(cctx, &clistenon);
if (clistenon != NULL) {
result = ns_listenlist_fromconfig(clistenon,
cctx,
&aclconfctx,
ns_g_mctx,
&listenon);
} else {
/* Not specified, use default. */
CHECK(ns_listenlist_default(ns_g_mctx, ns_g_port,
&listenon));
}
ns_interfacemgr_setlistenon(server->interfacemgr, listenon);
ns_listenlist_detach(&listenon);
}
/*
* Rescan the interface list to pick up changes in the
* listen-on option. It's important that we do this before we try
* to configure the query source, since the dispatcher we use might
* be shared with an interface.
*/
scan_interfaces(server);
/*
* Arrange for further interface scanning to occur periodically
* as specified by the "interface-interval" option.
*/
interface_interval = 3600; /* Default is 1 hour. */
(void) dns_c_ctx_getinterfaceinterval(cctx, &interface_interval);
if (interface_interval == 0) {
isc_timer_reset(server->interface_timer,
isc_timertype_inactive,
NULL, NULL, ISC_TRUE);
} else {
isc_interval_t interval;
isc_interval_set(&interval, interface_interval, 0);
isc_timer_reset(server->interface_timer, isc_timertype_ticker,
NULL, &interval, ISC_FALSE);
}
CHECK(configure_server_querysource(cctx, server,
AF_INET, &dispatchv4));
CHECK(configure_server_querysource(cctx, server,
AF_INET6, &dispatchv6));
/*
* Configure and freeze all explicit views. Explicit
* views that have zones were already created at parsing
* time, but views with no zones must be created here.
*/
if (cctx->views != NULL) {
dns_c_view_t *cview;
for (cview = ISC_LIST_HEAD(cctx->views->views);
cview != NULL;
cview = ISC_LIST_NEXT(cview, next))
{
view = NULL;
CHECK(find_or_create_view(cview,
&lctx.viewlist, &view));
INSIST(view != NULL);
CHECK(configure_view(view, cctx, cview, ns_g_mctx,
&aclconfctx,
dispatchv4, dispatchv6));
dns_view_freeze(view);
dns_view_detach(&view);
}
}
INSIST(view == NULL);
/*
* Make sure we have a default view if and only if there
* were no explicit views.
*/
if (cctx->views == NULL || ISC_LIST_EMPTY(cctx->views->views)) {
/*
* No explicit views; there ought to be a default view.
* There may already be one created as a size effect
* of zone statements, or we may have to create one.
* In either case, we need to configure and freeze it.
*/
CHECK(find_or_create_view(NULL, &lctx.viewlist, &view));
CHECK(configure_view(view, cctx, NULL,
ns_g_mctx, &aclconfctx,
dispatchv4, dispatchv6));
dns_view_freeze(view);
dns_view_detach(&view);
} else {
/*
* There are explicit views. There should not be
* a default view. If there is one, complain.
*/
result = dns_viewlist_find(&lctx.viewlist, "_default",
dns_rdataclass_in, &view);
if (result == ISC_R_SUCCESS) {
dns_view_detach(&view);
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
"when using 'view' statements, "
"all zones must be in views");
result = ISC_R_FAILURE;
goto cleanup;
}
}
/*
* Create (or recreate) the version view.
*/
view = NULL;
CHECK(create_version_view(cctx, &view));
ISC_LIST_APPEND(lctx.viewlist, view, link);
view = NULL;
/*
* Swap our new view list with the production one.
*/
tmpviewlist = server->viewlist;
server->viewlist = lctx.viewlist;
lctx.viewlist = tmpviewlist;
/*
* Load the TKEY information from the configuration.
*/
{
dns_tkey_ctx_t *t = NULL;
CHECKM(dns_tkeyctx_fromconfig(cctx, ns_g_mctx, &t),
"configuring TKEY");
if (server->tkeyctx != NULL)
dns_tkeyctx_destroy(&server->tkeyctx);
server->tkeyctx = t;
}
/*
* Relinquish root privileges.
*/
if (first_time)
ns_os_changeuser(ns_g_username);
/*
* Configure the logging system.
*
* Do this after changing UID to make sure that any log
* files specified in named.conf get created by the
* unprivileged user, not root.
*/
if (ns_g_logstderr) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_INFO,
"ignoring config file logging "
"statement due to -g option");
} else {
dns_c_logginglist_t *clog = NULL;
isc_logconfig_t *logc = NULL;
CHECKM(isc_logconfig_create(ns_g_lctx, &logc),
"creating new logging configuration");
(void) dns_c_ctx_getlogging(cctx, &clog);
if (clog != NULL) {
CHECKM(ns_log_configure(logc, clog),
"configuring logging");
} else {
CHECKM(ns_log_setdefaultchannels(logc),
"setting up default logging channels");
CHECKM(ns_log_setdefaultcategory(logc),
"setting up default 'category default'");
}
result = isc_logconfig_use(ns_g_lctx, logc);
if (result != ISC_R_SUCCESS) {
isc_logconfig_destroy(&logc);
CHECKM(result, "installing logging configuration");
}
}
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_DEBUG(1),
"now using logging configuration from "
"config file");
if (dns_c_ctx_getpidfilename(cctx, &pidfilename) ==
ISC_R_NOTFOUND)
pidfilename = ns_g_defaultpidfile;
ns_os_writepidfile(pidfilename);
dns_aclconfctx_destroy(&aclconfctx);
dns_c_ctx_delete(&cctx);
cleanup:
/*
* This cleans up either the old production view list
* or our temporary list depending on whether they
* were swapped above or not.
*/
for (view = ISC_LIST_HEAD(lctx.viewlist);
view != NULL;
view = view_next) {
view_next = ISC_LIST_NEXT(view, link);
ISC_LIST_UNLINK(lctx.viewlist, view, link);
dns_view_detach(&view);
}
if (dispatchv4 != NULL)
dns_dispatch_detach(&dispatchv4);
if (dispatchv6 != NULL)
dns_dispatch_detach(&dispatchv6);
dns_zonemgr_unlockconf(server->zonemgr, isc_rwlocktype_write);
RWUNLOCK(&server->conflock, isc_rwlocktype_write);
return (result);
}
static isc_result_t
load_zones(ns_server_t *server, isc_boolean_t stop) {
isc_result_t result;
dns_view_t *view;
dns_zonemgr_lockconf(server->zonemgr, isc_rwlocktype_read);
/*
* Load zone data from disk.
*/
for (view = ISC_LIST_HEAD(server->viewlist);
view != NULL;
view = ISC_LIST_NEXT(view, link))
{
CHECK(dns_view_load(view, stop));
}
/*
* Force zone maintenance. Do this after loading
* so that we know when we need to force AXFR of
* slave zones whose master files are missing.
*/
CHECK(dns_zonemgr_forcemaint(server->zonemgr));
cleanup:
dns_zonemgr_unlockconf(server->zonemgr, isc_rwlocktype_read);
return (result);
}
static void
run_server(isc_task_t *task, isc_event_t *event) {
isc_result_t result;
ns_server_t *server = (ns_server_t *)event->ev_arg;
UNUSED(task);
isc_event_free(&event);
CHECKFATAL(ns_clientmgr_create(ns_g_mctx, ns_g_taskmgr, ns_g_timermgr,
&server->clientmgr),
"creating client manager");
CHECKFATAL(ns_interfacemgr_create(ns_g_mctx, ns_g_taskmgr,
ns_g_socketmgr, server->clientmgr,
&server->interfacemgr),
"creating interface manager");
CHECKFATAL(isc_timer_create(ns_g_timermgr, isc_timertype_inactive,
NULL, NULL, server->task,
interface_timer_tick,
server, &server->interface_timer),
"creating interface timer");
CHECKFATAL(load_configuration(ns_g_conffile, server, ISC_TRUE),
"loading configuration");
CHECKFATAL(load_zones(server, ISC_TRUE),
"loading zones");
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
ISC_LOG_INFO, "running");
}
static void
shutdown_server(isc_task_t *task, isc_event_t *event) {
dns_view_t *view, *view_next;
ns_server_t *server = (ns_server_t *)event->ev_arg;
UNUSED(task);
RWLOCK(&server->conflock, isc_rwlocktype_write);
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
ISC_LOG_INFO, "shutting down");
for (view = ISC_LIST_HEAD(server->viewlist);
view != NULL;
view = view_next) {
view_next = ISC_LIST_NEXT(view, link);
ISC_LIST_UNLINK(server->viewlist, view, link);
dns_view_detach(&view);
}
if (server->querysrc_dispatchv4 != NULL)
dns_dispatch_detach(&server->querysrc_dispatchv4);
if (server->querysrc_dispatchv6 != NULL)
dns_dispatch_detach(&server->querysrc_dispatchv6);
ns_clientmgr_destroy(&server->clientmgr);
isc_timer_detach(&server->interface_timer);
ns_interfacemgr_shutdown(server->interfacemgr);
ns_interfacemgr_detach(&server->interfacemgr);
dns_zonemgr_shutdown(server->zonemgr);
isc_task_detach(&server->task);
isc_event_free(&event);
RWUNLOCK(&server->conflock, isc_rwlocktype_write);
}
void
ns_server_create(isc_mem_t *mctx, ns_server_t **serverp) {
isc_result_t result;
ns_server_t *server = isc_mem_get(mctx, sizeof(*server));
if (server == NULL)
fatal("allocating server object", ISC_R_NOMEMORY);
server->mctx = mctx;
server->task = NULL;
CHECKFATAL(isc_rwlock_init(&server->conflock, 1, 1),
"initializing server configuration lock");
/* Initialize configuration data with default values. */
result = isc_quota_init(&server->xfroutquota, 10);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
result = isc_quota_init(&server->tcpquota, 10);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
result = isc_quota_init(&server->recursionquota, 100);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
result = dns_aclenv_init(mctx, &server->aclenv);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
/* Initialize server data structures. */
server->zonemgr = NULL;
server->clientmgr = NULL;
server->interfacemgr = NULL;
ISC_LIST_INIT(server->viewlist);
server->in_roothints = NULL;
CHECKFATAL(dns_rootns_create(mctx, dns_rdataclass_in, NULL,
&server->in_roothints),
"setting up root hints");
CHECKFATAL(isc_mutex_init(&server->reload_event_lock),
"initializing reload event lock");
server->reload_event =
isc_event_allocate(ns_g_mctx, server,
NS_EVENT_RELOAD,
ns_server_reload,
server,
sizeof(isc_event_t));
CHECKFATAL(server->reload_event == NULL ?
ISC_R_NOMEMORY : ISC_R_SUCCESS,
"allocating reload event");
server->tkeyctx = NULL;
CHECKFATAL(dns_tkeyctx_create(ns_g_mctx, &server->tkeyctx),
"creating TKEY context");
server->querysrc_dispatchv4 = NULL;
server->querysrc_dispatchv6 = NULL;
/*
* Setup the server task, which is responsible for coordinating
* startup and shutdown of the server.
*/
CHECKFATAL(isc_task_create(ns_g_taskmgr, 0, &server->task),
"creating server task");
isc_task_setname(server->task, "server", server);
CHECKFATAL(isc_task_onshutdown(server->task, shutdown_server, server),
"isc_task_onshutdown");
CHECKFATAL(isc_app_onrun(ns_g_mctx, server->task, run_server, server),
"isc_app_onrun");
server->interface_timer = NULL;
/*
* Create a timer for periodic interface scanning.
*/
CHECKFATAL(dns_zonemgr_create(ns_g_mctx, ns_g_taskmgr, ns_g_timermgr,
ns_g_socketmgr, &server->zonemgr),
"dns_zonemgr_create");
server->magic = NS_SERVER_MAGIC;
*serverp = server;
}
void
ns_server_destroy(ns_server_t **serverp) {
ns_server_t *server = *serverp;
REQUIRE(NS_SERVER_VALID(server));
REQUIRE(server->querysrc_dispatchv4 == NULL);
REQUIRE(server->querysrc_dispatchv6 == NULL);
if (server->tkeyctx != NULL)
dns_tkeyctx_destroy(&server->tkeyctx);
isc_event_free(&server->reload_event);
INSIST(ISC_LIST_EMPTY(server->viewlist));
dns_zonemgr_destroy(&server->zonemgr);
server->zonemgr = NULL;
dns_db_detach(&server->in_roothints);
dns_aclenv_destroy(&server->aclenv);
isc_quota_destroy(&server->recursionquota);
isc_quota_destroy(&server->tcpquota);
isc_quota_destroy(&server->xfroutquota);
isc_rwlock_destroy(&server->conflock);
server->magic = 0;
isc_mem_put(server->mctx, server, sizeof(*server));
}
static void
fatal(char *msg, isc_result_t result) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
ISC_LOG_CRITICAL, "%s: %s", msg,
isc_result_totext(result));
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
ISC_LOG_CRITICAL, "exiting (due to fatal error)");
exit(1);
}
static void
ns_server_reload(isc_task_t *task, isc_event_t *event) {
isc_result_t result;
ns_server_t *server = (ns_server_t *)event->ev_arg;
UNUSED(task);
result = load_configuration(ns_g_conffile, server, ISC_FALSE);
if (result != ISC_R_SUCCESS) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
"reloading configuration failed: %s",
isc_result_totext(result));
}
result = load_zones(server, ISC_FALSE);
if (result != ISC_R_SUCCESS) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
"reloading zones failed: %s",
isc_result_totext(result));
}
LOCK(&server->reload_event_lock);
INSIST(server->reload_event == NULL);
server->reload_event = event;
UNLOCK(&server->reload_event_lock);
}
void
ns_server_reloadwanted(ns_server_t *server) {
LOCK(&server->reload_event_lock);
if (server->reload_event != NULL)
isc_task_send(server->task, &server->reload_event);
UNLOCK(&server->reload_event_lock);
}
static isc_result_t
ns_listenlist_fromconfig(dns_c_lstnlist_t *clist, dns_c_ctx_t *cctx,
dns_aclconfctx_t *actx,
isc_mem_t *mctx, ns_listenlist_t **target)
{
dns_c_lstnon_t *ce;
isc_result_t result;
ns_listenlist_t *dlist = NULL;
REQUIRE(target != NULL && *target == NULL);
result = ns_listenlist_create(mctx, &dlist);
if (result != ISC_R_SUCCESS)
return (result);
for (ce = ISC_LIST_HEAD(clist->elements);
ce != NULL;
ce = ISC_LIST_NEXT(ce, next))
{
ns_listenelt_t *delt = NULL;
result = ns_listenelt_fromconfig(ce, cctx, actx, mctx, &delt);
if (result != ISC_R_SUCCESS)
goto cleanup;
ISC_LIST_APPEND(dlist->elts, delt, link);
}
*target = dlist;
return (ISC_R_SUCCESS);
cleanup:
ns_listenlist_detach(&dlist);
return (result);
}
/*
* Create a listen list from the corresponding configuration
* data structure.
*/
static isc_result_t
ns_listenelt_fromconfig(dns_c_lstnon_t *celt, dns_c_ctx_t *cctx,
dns_aclconfctx_t *actx,
isc_mem_t *mctx, ns_listenelt_t **target)
{
isc_result_t result;
ns_listenelt_t *delt = NULL;
REQUIRE(target != NULL && *target == NULL);
result = ns_listenelt_create(mctx, celt->port, NULL, &delt);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_acl_fromconfig(celt->iml, cctx, actx, mctx, &delt->acl);
if (result != ISC_R_SUCCESS) {
ns_listenelt_destroy(delt);
return (result);
}
*target = delt;
return (ISC_R_SUCCESS);
}