Fixed crash on problems with loading plugins.

[stg.git] / 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 a007c890e4647005b0ffe2f6d4f994889a87c0c2..68f7270caff0aafe4256c8fb63a9f76390052504 100644 (file)
--- a/projects/stargazer/plugins/capture/nfqueue/nfqueue.cpp
+++ b/projects/stargazer/plugins/capture/nfqueue/nfqueue.cpp
@@ -25,14 +25,55 @@
 #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;
+
+RAW_PACKET 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();
@@ -56,6 +97,9 @@ NFQ_CAP::NFQ_CAP()
       thread(),
       nonstop(false),
       isRunning(false),
+      queueNumber(0),
+      nfqHandle(NULL),
+      queueHandle(NULL),
       traffCnt(NULL),
       logger(GetPluginLogger(GetStgLogger(), "cap_nfqueue"))
 {
@@ -63,6 +107,14 @@ NFQ_CAP::NFQ_CAP()
 //-----------------------------------------------------------------------------
 int NFQ_CAP::ParseSettings()
 {
+for (size_t i = 0; i < settings.moduleParams.size(); i++)
+    if (settings.moduleParams[i].param == "queueNumber")
+        if (str2x(settings.moduleParams[i].param, queueNumber) < 0)
+            {
+            errorStr = "Queue number should be a number. Got: '" + settings.moduleParams[i].param + "'";
+            logger(errorStr);
+            return -1;
+            }
 return 0;
 }
 //-----------------------------------------------------------------------------
@@ -71,6 +123,43 @@ int NFQ_CAP::Start()
 if (isRunning)
     return 0;
 
+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;
+    }
+
+queueHandle = nfq_create_queue(nfqHandle, queueNumber, &Callback, this);
+if (queueHandle == NULL)
+    {
+    errorStr = "Failed to create queue " + x2str(queueNumber) + ".";
+    logger(errorStr);
+    return -1;
+    }
+
+if (nfq_set_mode(queueHandle, NFQNL_COPY_PACKET, 0xffFF) < 0)
+    {
+    errorStr = "Failed to set queue " + x2str(queueNumber) + " mode.";
+    logger(errorStr);
+    return -1;
+    }
+
 nonstop = true;
 
 if (pthread_create(&thread, NULL, Run, this))
@@ -122,6 +211,9 @@ if (isRunning)
 
 pthread_join(thread, NULL);
 
+nfq_destroy_queue(queueHandle);
+nfq_close(nfqHandle);
+
 return 0;
 }
 //-----------------------------------------------------------------------------
@@ -134,10 +226,29 @@ pthread_sigmask(SIG_BLOCK, &signalSet, NULL);
 NFQ_CAP * dc = static_cast<NFQ_CAP *>(d);
 dc->isRunning = true;
 
+int fd = nfq_fd(dc->nfqHandle);
+char buf[4096];
+
 while (dc->nonstop)
     {
+        if (!WaitPackets(fd))
+            continue;
+
+        int rv = read(fd, buf, sizeof(buf));
+        if (rv < 0)
+            {
+            dc->errorStr = std::string("Read error: ") + strerror(errno);
+            dc->logger(dc->errorStr);
+            break;
+            }
+        nfq_handle_packet(dc->nfqHandle, buf, rv);
     }
 
 dc->isRunning = false;
 return NULL;
 }
+//-----------------------------------------------------------------------------
+void NFQ_CAP::Process(const RAW_PACKET & packet)
+{
+traffCnt->Process(packet);
+}