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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Implements a listener that works with stream connections over a named pipe.
*
*/
#include <config.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <sys/un.h>
#include <errno.h>
#include <unistd.h>
#include <ccnx/forwarder/metis/core/metis_ConnectionTable.h>
#include <ccnx/forwarder/metis/core/metis_Forwarder.h>
#include <ccnx/forwarder/metis/io/metis_Listener.h>
#include <ccnx/forwarder/metis/io/metis_LocalListener.h>
#include <ccnx/forwarder/metis/io/metis_StreamConnection.h>
#include <LongBow/runtime.h>
#include <parc/algol/parc_Memory.h>
struct metis_local_listener {
MetisForwarder *metis;
MetisLogger *logger;
PARCEventSocket *listener;
CPIAddress *localAddress;
unsigned id;
};
static void _metisLocalListener_OpsDestroy(MetisListenerOps **listenerOpsPtr);
static unsigned _metisLocalListener_OpsGetInterfaceIndex(const MetisListenerOps *ops);
static const CPIAddress *_metisLocalListener_OpsGetListenAddress(const MetisListenerOps *ops);
static MetisEncapType _metisLocalListener_OpsGetEncapType(const MetisListenerOps *ops);
static MetisListenerOps localTemplate = {
.context = NULL,
.destroy = &_metisLocalListener_OpsDestroy,
.getInterfaceIndex = &_metisLocalListener_OpsGetInterfaceIndex,
.getListenAddress = &_metisLocalListener_OpsGetListenAddress,
.getEncapType = &_metisLocalListener_OpsGetEncapType,
};
// STREAM daemon listener callback
static void metisListenerLocal_Listen(int, struct sockaddr *, int socklen, void *localVoid);
MetisListenerOps *
metisLocalListener_Create(MetisForwarder *metis, const char *path)
{
MetisLocalListener *local = parcMemory_AllocateAndClear(sizeof(MetisLocalListener));
assertNotNull(local, "parcMemory_AllocateAndClear(%zu) returned NULL", sizeof(MetisLocalListener));
local->metis = metis;
local->logger = metisLogger_Acquire(metisForwarder_GetLogger(metis));
struct sockaddr_un addr_unix;
memset(&addr_unix, 0, sizeof(addr_unix));
addr_unix.sun_family = PF_UNIX;
strcpy(addr_unix.sun_path, path);
unlink(path);
local->listener = metisDispatcher_CreateListener(metisForwarder_GetDispatcher(metis), metisListenerLocal_Listen,
(void *) local, -1, (struct sockaddr*) &addr_unix, sizeof(addr_unix));
assertNotNull(local->listener, "Got null listener from metisDispatcher_CreateListener: (%d) %s", errno, strerror(errno));
struct sockaddr_un addr_un;
memset(&addr_un, 0, sizeof(addr_un));
addr_un.sun_family = AF_UNIX;
strcpy(addr_un.sun_path, path);
local->localAddress = cpiAddress_CreateFromUnix(&addr_un);
local->id = metisForwarder_GetNextConnectionId(metis);
MetisListenerOps *ops = parcMemory_AllocateAndClear(sizeof(MetisListenerOps));
assertNotNull(ops, "parcMemory_AllocateAndClear(%zu) returned NULL", sizeof(MetisListenerOps));
memcpy(ops, &localTemplate, sizeof(MetisListenerOps));
ops->context = local;
return ops;
}
void
metisLocalListener_Destroy(MetisLocalListener **listenerPtr)
{
assertNotNull(listenerPtr, "Parameter must be non-null double pointer");
assertNotNull(*listenerPtr, "Parameter must dereference to non-null pointer");
MetisLocalListener *local = *listenerPtr;
metisLogger_Release(&local->logger);
cpiAddress_Destroy(&local->localAddress);
metisDispatcher_DestroyListener(metisForwarder_GetDispatcher(local->metis), &local->listener);
parcMemory_Deallocate((void **) &local);
*listenerPtr = NULL;
}
// ==================================================
/**
* @function metisListenerLocal_Listen
* @abstract Called when a client connects to the server socket
* @discussion
* Accepts a client connection. Creates a new Stream connection and adds it
* to the connection table.
*
* @param fd the remote client socket (it will be AF_UNIX type)
* @param sa the remote client address
* @param socklen the bytes of sa
* @param localVoid a void point to the MetisLocalListener that owns the server socket
*/
static void
metisListenerLocal_Listen(int fd,
struct sockaddr *sa, int socklen, void *localVoid)
{
MetisLocalListener *local = (MetisLocalListener *) localVoid;
assertTrue(sa->sa_family == AF_UNIX, "Got wrong address family, expected %d got %d", AF_UNIX, sa->sa_family);
CPIAddress *remote = cpiAddress_CreateFromUnix((struct sockaddr_un *) sa);
MetisAddressPair *pair = metisAddressPair_Create(local->localAddress, remote);
MetisIoOperations *ops = metisStreamConnection_AcceptConnection(local->metis, fd, pair, true);
MetisConnection *conn = metisConnection_Create(ops);
metisConnectionTable_Add(metisForwarder_GetConnectionTable(local->metis), conn);
if (metisLogger_IsLoggable(local->logger, MetisLoggerFacility_IO, PARCLogLevel_Debug)) {
char *str = metisAddressPair_ToString(pair);
metisLogger_Log(local->logger, MetisLoggerFacility_IO, PARCLogLevel_Debug, __func__,
"Listener %p started on address pair %s", (void *) local, str);
free(str);
}
cpiAddress_Destroy(&remote);
}
static void
_metisLocalListener_OpsDestroy(MetisListenerOps **listenerOpsPtr)
{
MetisListenerOps *ops = *listenerOpsPtr;
MetisLocalListener *local = (MetisLocalListener *) ops->context;
if (metisLogger_IsLoggable(local->logger, MetisLoggerFacility_IO, PARCLogLevel_Debug)) {
metisLogger_Log(local->logger, MetisLoggerFacility_IO, PARCLogLevel_Debug, __func__,
"Listener %p destroyed", (void *) local);
}
metisLocalListener_Destroy(&local);
parcMemory_Deallocate((void **) &ops);
*listenerOpsPtr = NULL;
}
static unsigned
_metisLocalListener_OpsGetInterfaceIndex(const MetisListenerOps *ops)
{
MetisLocalListener *local = (MetisLocalListener *) ops->context;
return local->id;
}
static const CPIAddress *
_metisLocalListener_OpsGetListenAddress(const MetisListenerOps *ops)
{
MetisLocalListener *local = (MetisLocalListener *) ops->context;
return local->localAddress;
}
static MetisEncapType
_metisLocalListener_OpsGetEncapType(const MetisListenerOps *ops)
{
return METIS_ENCAP_LOCAL;
}
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