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The 'forwarders' and 'forward' options are now hooked up.

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If the server had been bound to a particular query source and was then
reloaded, the reloading would fail due to "address in use" if the query
source had not been changed.  The server now remembers if a custom dispatcher
is in use, and reuses it if it is compatible with the new configuration.
This commit is contained in:
Bob Halley 2000-01-31 19:59:11 +00:00
parent 1340f42b21
commit f5facdfc29
1 changed files with 86 additions and 3 deletions
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89
bin/named/server.c
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@ -52,6 +52,7 @@
#include <dns/master.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/resolver.h>
#include <dns/result.h>
#include <dns/rootns.h>
#include <dns/tkeyconf.h>
@ -129,9 +130,17 @@ configure_view(dns_view_t *view, dns_c_ctx_t *cctx, isc_mem_t *mctx,
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;
unsigned int i;
REQUIRE(DNS_VIEW_VALID(view));
ISC_LIST_INIT(addresses);
RWLOCK(&view->conflock, isc_rwlocktype_write);
/*
@ -166,6 +175,40 @@ configure_view(dns_view_t *view, dns_c_ctx_t *cctx, isc_mem_t *mctx,
ns_g_socketmgr, ns_g_timermgr,
0, dispatch, NULL));
/*
* Set resolver forwarding policy.
*/
if (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));
CHECK(dns_resolver_setforwarders(view->resolver, &addresses));
/*
* XXXRTH The configuration type 'dns_c_forw_t' should be
* elminated.
*/
if (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.
*/
@ -181,7 +224,14 @@ configure_view(dns_view_t *view, dns_c_ctx_t *cctx, isc_mem_t *mctx,
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);
}
return (result);
}
@ -573,8 +623,29 @@ configure_server_querysource(dns_c_ctx_t *cctx, ns_server_t *server,
ISC_R_SUCCESS) {
/*
* The interface manager doesn't have a matching dispatcher.
* Create one.
*/
if (server->querysrc_dispatch != NULL) {
/*
* We've already got a custom dispatcher. If it is
* compatible with the new configuration, use it.
*/
if (isc_sockaddr_equal(&server->querysrc_address,
&sa)) {
dns_dispatch_attach(server->querysrc_dispatch,
dispatchp);
return (ISC_R_SUCCESS);
}
/*
* The existing custom dispatcher is not compatible.
* We don't need it anymore.
*/
dns_dispatch_detach(&server->querysrc_dispatch);
}
/*
* Create a custom dispatcher.
*/
INSIST(server->querysrc_dispatch == NULL);
server->querysrc_address = sa;
socket = NULL;
result = isc_socket_create(ns_g_socketmgr, AF_INET,
isc_sockettype_udp,
@ -589,7 +660,7 @@ configure_server_querysource(dns_c_ctx_t *cctx, ns_server_t *server,
result = dns_dispatch_create(ns_g_mctx, socket,
server->task, 4096,
1000, 32768, 16411, 16433, NULL,
dispatchp);
&server->querysrc_dispatch);
/*
* Regardless of whether dns_dispatch_create() succeeded or
* failed, we don't need to keep the reference to the socket.
@ -597,6 +668,14 @@ configure_server_querysource(dns_c_ctx_t *cctx, ns_server_t *server,
isc_socket_detach(&socket);
if (result != ISC_R_SUCCESS)
return (result);
dns_dispatch_attach(server->querysrc_dispatch, dispatchp);
} else {
/*
* We're sharing a UDP dispatcher with the interface manager
* now. Any prior custom dispatcher can be discarded.
*/
if (server->querysrc_dispatch != NULL)
dns_dispatch_detach(&server->querysrc_dispatch);
}
return (ISC_R_SUCCESS);
@ -888,6 +967,8 @@ shutdown_server(isc_task_t *task, isc_event_t *event) {
dns_view_detach(&view);
}
if (server->querysrc_dispatch != NULL)
dns_dispatch_detach(&server->querysrc_dispatch);
ns_clientmgr_destroy(&server->clientmgr);
ns_interfacemgr_shutdown(server->interfacemgr);
ns_interfacemgr_detach(&server->interfacemgr);
@ -956,6 +1037,7 @@ ns_server_create(isc_mem_t *mctx, ns_server_t **serverp) {
server->tkeyctx = NULL;
CHECKFATAL(dns_tkeyctx_create(ns_g_mctx, &server->tkeyctx),
"creating TKEY context");
server->querysrc_dispatch = NULL;
/*
* Setup the server task, which is responsible for coordinating
@ -982,6 +1064,7 @@ ns_server_destroy(ns_server_t **serverp) {
ns_server_t *server = *serverp;
REQUIRE(NS_SERVER_VALID(server));
REQUIRE(server->querysrc_dispatch == NULL);
if (server->tkeyctx != NULL)
dns_tkeyctx_destroy(&server->tkeyctx);