X-Git-Url: https://git.stg.codes/stg.git/blobdiff_plain/1acd024a6ba46ab0d9f9c25c089f79a4cba93f25..1cd2b12bd4e4d86f6cd099240795f3ebeb3852b3:/projects/stargazer/plugins/capture/nfqueue/nfqueue.cpp

diff --git a/projects/stargazer/plugins/capture/nfqueue/nfqueue.cpp b/projects/stargazer/plugins/capture/nfqueue/nfqueue.cpp
index a007c890..0a5d8712 100644
--- a/projects/stargazer/plugins/capture/nfqueue/nfqueue.cpp
+++ b/projects/stargazer/plugins/capture/nfqueue/nfqueue.cpp
@@ -21,27 +21,62 @@
 #include "nfqueue.h"
 
 #include "stg/traffcounter.h"
-#include "stg/plugin_creator.h"
 #include "stg/common.h"
 #include "stg/raw_ip_packet.h"
 
-#include <signal.h>
+extern "C" {
+
+#include <linux/netfilter.h>  /* Defines verdicts (NF_ACCEPT, etc) */
+#include <libnetfilter_queue/libnetfilter_queue.h>
+
+}
+
+#include <cerrno>
+#include <csignal>
+
+#include <arpa/inet.h> // ntohl
+
+#include <unistd.h> // read
 
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 namespace
 {
-PLUGIN_CREATOR<NFQ_CAP> ncc;
+
+int Callback(struct nfq_q_handle * queueHandle, struct nfgenmsg * /*msg*/,
+             struct nfq_data * nfqData, void *data)
+{
+int id = 0;
+
+struct nfqnl_msg_packet_hdr * packetHeader = nfq_get_msg_packet_hdr(nfqData);
+if (packetHeader == NULL)
+    return 0;
+
+id = ntohl(packetHeader->packet_id);
+
+unsigned char * payload = NULL;
+
+if (nfq_get_payload(nfqData, &payload) < 0 || payload == NULL)
+    return id;
+
+STG::RawPacket packet;
+
+memcpy(&packet.rawPacket, payload, sizeof(packet.rawPacket));
+
+NFQ_CAP * cap = static_cast<NFQ_CAP *>(data);
+
+cap->Process(packet);
+
+return nfq_set_verdict(queueHandle, id, NF_ACCEPT, 0, NULL);
 }
 
-extern "C" PLUGIN * GetPlugin();
-//-----------------------------------------------------------------------------
-//-----------------------------------------------------------------------------
-//-----------------------------------------------------------------------------
-PLUGIN * GetPlugin()
+}
+
+extern "C" STG::Plugin* GetPlugin()
 {
-return ncc.GetPlugin();
+    static NFQ_CAP plugin;
+    return &plugin;
 }
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
@@ -52,17 +87,25 @@ return "cap_nfqueue v.1.0";
 }
 //-----------------------------------------------------------------------------
 NFQ_CAP::NFQ_CAP()
-    : errorStr(),
-      thread(),
-      nonstop(false),
-      isRunning(false),
+    : isRunning(false),
+      queueNumber(0),
+      nfqHandle(NULL),
+      queueHandle(NULL),
       traffCnt(NULL),
-      logger(GetPluginLogger(GetStgLogger(), "cap_nfqueue"))
+      logger(STG::PluginLogger::get("cap_nfqueue"))
 {
 }
 //-----------------------------------------------------------------------------
 int NFQ_CAP::ParseSettings()
 {
+for (size_t i = 0; i < settings.moduleParams.size(); i++)
+    if (settings.moduleParams[i].param == "queueNumber" && !settings.moduleParams[i].value.empty())
+        if (str2x(settings.moduleParams[i].value[0], queueNumber) < 0)
+            {
+            errorStr = "Queue number should be a number. Got: '" + settings.moduleParams[i].param + "'";
+            logger(errorStr);
+            return -1;
+            }
 return 0;
 }
 //-----------------------------------------------------------------------------
@@ -71,16 +114,45 @@ int NFQ_CAP::Start()
 if (isRunning)
     return 0;
 
-nonstop = true;
+nfqHandle = nfq_open();
+if (nfqHandle == NULL)
+    {
+    errorStr = "Failed to initialize netfilter queue.";
+    logger(errorStr);
+    return -1;
+    }
+
+if (nfq_unbind_pf(nfqHandle, AF_INET) < 0)
+    {
+    errorStr = "Failed to unbind netfilter queue from IP handling.";
+    logger(errorStr);
+    return -1;
+    }
+
+if (nfq_bind_pf(nfqHandle, AF_INET) < 0)
+    {
+    errorStr = "Failed to bind netfilter queue to IP handling.";
+    logger(errorStr);
+    return -1;
+    }
 
-if (pthread_create(&thread, NULL, Run, this))
+queueHandle = nfq_create_queue(nfqHandle, queueNumber, &Callback, this);
+if (queueHandle == NULL)
     {
-    errorStr = "Cannot create thread.";
-    logger("Cannot create thread.");
-    printfd(__FILE__, "Cannot create thread\n");
+    errorStr = "Failed to create queue " + std::to_string(queueNumber) + ".";
+    logger(errorStr);
     return -1;
     }
 
+if (nfq_set_mode(queueHandle, NFQNL_COPY_PACKET, 0xffFF) < 0)
+    {
+    errorStr = "Failed to set queue " + std::to_string(queueNumber) + " mode.";
+    logger(errorStr);
+    return -1;
+    }
+
+m_thread = std::jthread([this](auto token){ Run(std::move(token)); });
+
 return 0;
 }
 //-----------------------------------------------------------------------------
@@ -89,7 +161,7 @@ int NFQ_CAP::Stop()
 if (!isRunning)
     return 0;
 
-nonstop = false;
+m_thread.request_stop();
 
 //5 seconds to thread stops itself
 for (int i = 0; i < 25 && isRunning; i++)
@@ -99,45 +171,46 @@ for (int i = 0; i < 25 && isRunning; i++)
     }
 //after 5 seconds waiting thread still running. now killing it
 if (isRunning)
-    {
-    if (pthread_kill(thread, SIGUSR1))
-        {
-        errorStr = "Cannot kill thread.";
-        logger("Cannot send signal to thread.");
-        return -1;
-        }
-    for (int i = 0; i < 25 && isRunning; ++i)
-        {
-        struct timespec ts = {0, 200000000};
-        nanosleep(&ts, NULL);
-        }
-    if (isRunning)
-        {
-        errorStr = "NFQ_CAP not stopped.";
-        logger("Cannot stop thread.");
-        printfd(__FILE__, "Cannot stop thread\n");
-        return -1;
-        }
-    }
+    m_thread.detach();
+else
+    m_thread.join();
 
-pthread_join(thread, NULL);
+nfq_destroy_queue(queueHandle);
+nfq_close(nfqHandle);
 
 return 0;
 }
 //-----------------------------------------------------------------------------
-void * NFQ_CAP::Run(void * d)
+void NFQ_CAP::Run(std::stop_token token)
 {
 sigset_t signalSet;
 sigfillset(&signalSet);
 pthread_sigmask(SIG_BLOCK, &signalSet, NULL);
 
-NFQ_CAP * dc = static_cast<NFQ_CAP *>(d);
-dc->isRunning = true;
+isRunning = true;
+
+int fd = nfq_fd(nfqHandle);
+char buf[4096];
 
-while (dc->nonstop)
+while (!token.stop_requested())
     {
+        if (!WaitPackets(fd))
+            continue;
+
+        int rv = read(fd, buf, sizeof(buf));
+        if (rv < 0)
+            {
+            errorStr = std::string("Read error: ") + strerror(errno);
+            logger(errorStr);
+            break;
+            }
+        nfq_handle_packet(nfqHandle, buf, rv);
     }
 
-dc->isRunning = false;
-return NULL;
+isRunning = false;
+}
+//-----------------------------------------------------------------------------
+void NFQ_CAP::Process(const STG::RawPacket & packet)
+{
+traffCnt->process(packet);
 }