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client can now reserve multiple types of quota simultaneously;

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removed unused clienttype argument; client quota bug fixes
This commit is contained in:
Andreas Gustafsson
2000-01-15 00:36:26 +00:00
parent cec6fc9dc5
commit ff03559f14
1 changed files with 34 additions and 47 deletions
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81
bin/named/client.c
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@@ -98,6 +98,14 @@ static void clientmgr_destroy(ns_clientmgr_t *manager);
* task to change the client, then the client will have to be locked.
*/
static void
release_quotas(ns_client_t *client) {
if (client->tcpquota != NULL)
isc_quota_detach(&client->tcpquota);
if (client->recursionquota != NULL)
isc_quota_detach(&client->recursionquota);
}
/*
* Free a client immediately if possible, otherwise start
* shutting it down and postpone freeing to later.
@@ -121,9 +129,15 @@ maybe_free(ns_client_t *client) {
ISC_SOCKCANCEL_ACCEPT);
if (client->nreads > 0)
dns_tcpmsg_cancelread(&client->tcpmsg);
if (client->nsends > 0)
if (client->nsends > 0) {
isc_socket_t *socket;
if (TCP_CLIENT(client))
socket = client->tcpsocket;
else
socket = dns_dispatch_getsocket(client->dispatch);
isc_socket_cancel(client->tcpsocket, client->task,
ISC_SOCKCANCEL_SEND);
}
if (!(client->nreads == 0 && client->naccepts == 0 &&
client->nsends == 0 && client->nwaiting == 0)) {
@@ -179,11 +193,8 @@ maybe_free(ns_client_t *client) {
UNLOCK(&manager->lock);
}
if (client->quota != NULL) {
isc_quota_release(client->quota);
client->quota = NULL;
}
release_quotas(client);
CTRACE("free");
client->magic = 0;
isc_mem_put(client->mctx, client, sizeof *client);
@@ -247,10 +258,9 @@ ns_client_next(ns_client_t *client, isc_result_t result) {
client->udpsize = 512;
dns_message_reset(client->message, DNS_MESSAGE_INTENTPARSE);
if (client->quota != NULL) {
isc_quota_release(client->quota);
client->quota = NULL;
}
release_quotas(client);
if (client->mortal) {
/*
* This client object is supposed to die now, but if we
@@ -277,8 +287,9 @@ ns_client_next(ns_client_t *client, isc_result_t result) {
isc_task_shutdown(client->task);
return;
}
client->mortal = ISC_FALSE;
}
if (client->dispevent != NULL) {
/*
* Give the processed dispatch event back to the dispatch.
@@ -580,6 +591,8 @@ client_request(isc_task_t *task, isc_event_t *event) {
REQUIRE(NS_CLIENT_VALID(client));
REQUIRE(task == client->task);
INSIST(client->recursionquota == NULL);
if (event->type == DNS_EVENT_DISPATCH) {
devent = (dns_dispatchevent_t *)event;
REQUIRE(client->dispentry != NULL);
@@ -782,7 +795,7 @@ client_timeout(isc_task_t *task, isc_event_t *event) {
}
static isc_result_t
client_create(ns_clientmgr_t *manager, ns_clienttype_t type,
client_create(ns_clientmgr_t *manager,
ns_interface_t *ifp, ns_client_t **clientp)
{
ns_client_t *client;
@@ -836,7 +849,6 @@ client_create(ns_clientmgr_t *manager, ns_clienttype_t type,
client->magic = NS_CLIENT_MAGIC;
client->mctx = manager->mctx;
client->manager = NULL;
client->type = type;
client->shuttingdown = ISC_FALSE;
client->waiting_for_bufs = ISC_FALSE;
client->naccepts = 0;
@@ -858,7 +870,8 @@ client_create(ns_clientmgr_t *manager, ns_clienttype_t type,
client->shutdown_arg = NULL;
dns_name_init(&client->signername, NULL);
client->mortal = ISC_FALSE;
client->quota = NULL;
client->tcpquota = NULL;
client->recursionquota = NULL;
client->interface = NULL;
ISC_LINK_INIT(client, link);
@@ -948,7 +961,10 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
* telnetting to port 35 (once per CPU) will
* deny service to legititmate TCP clients.
*/
result = ns_client_replace(client, &ns_g_server->tcpquota);
result = isc_quota_attach(&ns_g_server->tcpquota,
&client->tcpquota);
if (result == ISC_R_SUCCESS)
result = ns_client_replace(client);
if (result != ISC_R_SUCCESS) {
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_CLIENT, ISC_LOG_WARNING,
@@ -1017,37 +1033,10 @@ ns_client_unwait(ns_client_t *client) {
maybe_free(client);
}
isc_result_t
ns_client_getquota(ns_client_t *client, isc_quota_t *quota) {
isc_result_t result;
/*
* A client can only use one quota at a time.
* If we are already using a quota, release it.
*/
if (client->quota != NULL) {
isc_quota_release(client->quota);
client->quota = NULL;
}
result = isc_quota_reserve(quota);
if (result == ISC_R_SUCCESS) {
client->quota = quota;
} else {
return (result);
}
return (ISC_R_SUCCESS);
}
isc_result_t
ns_client_replace(ns_client_t *client, isc_quota_t *quota) {
ns_client_replace(ns_client_t *client) {
isc_result_t result;
CTRACE("replace");
if (quota != NULL) {
result = ns_client_getquota(client, quota);
if (result != DNS_R_SUCCESS)
return (result);
}
if (TCP_CLIENT(client)) {
result = ns_clientmgr_accepttcp(client->manager,
@@ -1174,8 +1163,7 @@ ns_clientmgr_addtodispatch(ns_clientmgr_t *manager, unsigned int n,
for (i = 0; i < n; i++) {
client = NULL;
result = client_create(manager, ns_clienttype_basic,
ifp, &client);
result = client_create(manager, ifp, &client);
if (result != ISC_R_SUCCESS)
break;
dns_dispatch_attach(ifp->udpdispatch, &client->dispatch);
@@ -1239,8 +1227,7 @@ ns_clientmgr_accepttcp(ns_clientmgr_t *manager, unsigned int n,
for (i = 0; i < n; i++) {
client = NULL;
result = client_create(manager, ns_clienttype_tcp,
ifp, &client);
result = client_create(manager, ifp, &client);
if (result != ISC_R_SUCCESS)
break;
client->attributes |= NS_CLIENTATTR_TCP;