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plugins/ndpi: stub in dummy ndpi plugin
This plugin stub shows how a plugin like nDPI might be use the flow init and flow update callbacks to do its work. Also shows usage of FlowStorage to avoid modifying the Flow struct directly.
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@@ -3,3 +3,7 @@ SUBDIRS = | |
if BUILD_PFRING | ||
SUBDIRS += pfring | ||
endif | ||
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if BUILD_NDPI | ||
SUBDIRS += ndpi-dummy | ||
endif |
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pkglib_LTLIBRARIES = ndpi.la | ||
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ndpi_la_LDFLAGS = -module -avoid-version -shared | ||
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ndpi_la_SOURCES = ndpi.c | ||
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install-exec-hook: | ||
cd $(DESTDIR)$(pkglibdir) && $(RM) $(pkglib_LTLIBRARIES) |
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/* Copyright (C) 2024 Open Information Security Foundation | ||
* | ||
* You can copy, redistribute or modify this Program under the terms of | ||
* the GNU General Public License version 2 as published by the Free | ||
* Software Foundation. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* version 2 along with this program; if not, write to the Free Software | ||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | ||
* 02110-1301, USA. | ||
*/ | ||
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/* License note: While this "glue" code to the nDPI library is GPLv2, | ||
* nDPI is itself LGPLv3 which is known to be incompatible with the | ||
* GPLv2. */ | ||
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#include "suricata-common.h" | ||
#include "suricata-plugin.h" | ||
#include "util-debug.h" | ||
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#include "thread-callbacks.h" | ||
#include "thread-storage.h" | ||
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#include "flow-callbacks.h" | ||
#include "flow-storage.h" | ||
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static ThreadStorageId thread_storage_id = { .id = -1 }; | ||
static FlowStorageId flow_storage_id = { .id = -1 }; | ||
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static void ThreadStorageFree(void *ptr) | ||
{ | ||
SCLogNotice("Free'ing nDPI thread storage"); | ||
SCFree(ptr); | ||
} | ||
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static void FlowStorageFree(void *ptr) | ||
{ | ||
SCLogNotice("De-allocating nDPI flow storage"); | ||
int *dummy_storage = ptr; | ||
SCLogNotice("%d", *dummy_storage); | ||
SCFree(ptr); | ||
} | ||
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static void OnFlowInit(ThreadVars *tv, Flow *f, const Packet *p, void *_data) | ||
{ | ||
SCLogNotice("..."); | ||
static int counter = 0; | ||
int *dummy_storage = SCCalloc(1, sizeof(int)); | ||
*dummy_storage = counter++; | ||
FlowSetStorageById(f, flow_storage_id, dummy_storage); | ||
} | ||
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static void OnFlowUpdate(ThreadVars *tv, Flow *f, Packet *p, void *_data) | ||
{ | ||
SCLogNotice("..."); | ||
int *dummy_storage = FlowGetStorageById(f, flow_storage_id); | ||
int *thread_storage = ThreadGetStorageById(tv, thread_storage_id); | ||
SCLogNotice("dummy_storage=%d, thread_storage=%d", *dummy_storage, *thread_storage); | ||
} | ||
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static void OnFlowFinish(ThreadVars *tv, Flow *f, void *_data) | ||
{ | ||
SCLogNotice("Flow %p is now finished", f); | ||
} | ||
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static void OnThreadInit(ThreadVars *tv, void *_data) | ||
{ | ||
static int count = 0; | ||
SCLogNotice("Thread initialized"); | ||
int *thread_storage = SCCalloc(1, sizeof(int)); | ||
*thread_storage = count++; | ||
ThreadSetStorageById(tv, thread_storage_id, thread_storage); | ||
} | ||
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static void NdpiInit(void) | ||
{ | ||
SCLogNotice("Initializing nDPI plugin"); | ||
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/* Register thread storage. */ | ||
thread_storage_id = ThreadStorageRegister("ndpi", sizeof(void *), NULL, ThreadStorageFree); | ||
if (thread_storage_id.id < 0) { | ||
FatalError("Failed to register nDPI thread storage"); | ||
} | ||
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/* Register flow storage. */ | ||
flow_storage_id = FlowStorageRegister("ndpi", sizeof(void *), NULL, FlowStorageFree); | ||
if (flow_storage_id.id < 0) { | ||
FatalError("Failed to register nDPI flow storage"); | ||
} | ||
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/* Register flow lifecycle callbacks. */ | ||
SCFlowRegisterInitCallback(OnFlowInit, NULL); | ||
SCFlowRegisterUpdateCallback(OnFlowUpdate, NULL); | ||
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/* Not needed for nDPI, but exists for completeness. */ | ||
SCFlowRegisterFinishCallback(OnFlowFinish, NULL); | ||
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/* Register thread init callback. */ | ||
SCThreadRegisterInitCallback(OnThreadInit, NULL); | ||
} | ||
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const SCPlugin PluginRegistration = { | ||
.name = "ndpi-dummy", | ||
.author = "FirstName LastName", | ||
.license = "GPLv2", | ||
.Init = NdpiInit, | ||
}; | ||
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const SCPlugin *SCPluginRegister() | ||
{ | ||
return &PluginRegistration; | ||
} |
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