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[stg.git] / projects / stargazer / plugins / capture / pcap / pcap_cap.cpp

diff --git a/projects/stargazer/plugins/capture/pcap/pcap_cap.cpp b/projects/stargazer/plugins/capture/pcap/pcap_cap.cpp
index 7fa7fb68ae9ced1838d32d2285a98bdd53b519f3..323bd7bf85f6200d372ab631061452676af50ebf 100644 (file)
--- a/projects/stargazer/plugins/capture/pcap/pcap_cap.cpp
+++ b/projects/stargazer/plugins/capture/pcap/pcap_cap.cpp
@@ -21,27 +21,36 @@
 #include "pcap_cap.h"
 
 #include "stg/traffcounter.h"
 #include "pcap_cap.h"
 
 #include "stg/traffcounter.h"

-#include "stg/plugin_creator.h"

 #include "stg/common.h"
 #include "stg/raw_ip_packet.h"
 
 #include "stg/common.h"
 #include "stg/raw_ip_packet.h"
 

+#include <signal.h>
+

 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 namespace
 {
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 namespace
 {

-PLUGIN_CREATOR<PCAP_CAP> pcc;

 
 

-const size_t SNAP_LEN 1518;
+const size_t SNAP_LEN = 1518;
+const size_t ETHER_ADDR_LEN = 6;
+
+struct ETH
+{
+u_char     ether_dhost[ETHER_ADDR_LEN];    /* destination host address */
+u_char     ether_shost[ETHER_ADDR_LEN];    /* source host address */
+u_short    ether_type;                     /* IP? ARP? RARP? etc */
+};
+

 }
 
 }
 

-extern "C" PLUGIN * GetPlugin();

 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------

-PLUGIN * GetPlugin()
+extern "C" STG::Plugin* GetPlugin()

 {
 {

-return pcc.GetPlugin();
+    static PCAP_CAP plugin;
+    return &plugin;

 }
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 }
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------


@@ -52,22 +61,50 @@ return "pcap_cap v.1.0";
 }
 //-----------------------------------------------------------------------------
 PCAP_CAP::PCAP_CAP()
 }
 //-----------------------------------------------------------------------------
 PCAP_CAP::PCAP_CAP()

-    : errorStr(),
-      thread(),
-      nonstop(false),
-      isRunning(false),
-      handle(NULL),
+    : isRunning(false),

       traffCnt(NULL),
       traffCnt(NULL),

-      logger(GetPluginLogger(GetStgLogger(), "cap_pcap"))
+      logger(STG::PluginLogger::get("pcap_cap"))

 {
 }
 //-----------------------------------------------------------------------------
 {
 }
 //-----------------------------------------------------------------------------

+int PCAP_CAP::ParseSettings()
+{
+devices.erase(devices.begin(), devices.end());
+
+if (settings.moduleParams.empty())
+    {
+    devices.push_back(DEV());
+    logger("Defaulting to pseudo-device 'any'.");
+    return 0;
+    }
+
+for (size_t i = 0; i < settings.moduleParams.size(); i++)
+    if (settings.moduleParams[i].param == "interfaces")
+        for (size_t j = 0; j < settings.moduleParams[i].value.size(); j++)
+            devices.push_back(DEV(settings.moduleParams[i].value[j]));
+
+for (size_t i = 0; i < settings.moduleParams.size(); i++)
+    if (settings.moduleParams[i].param == "filters")
+        for (size_t j = 0; j < settings.moduleParams[i].value.size(); j++)
+            if (j < devices.size())
+                devices[j].filterExpression = settings.moduleParams[i].value[j];
+
+if (devices.empty())
+    {
+    devices.push_back(DEV());
+    logger("Defaulting to pseudo-device 'all'.");
+    return 0;
+    }
+
+return 0;
+}
+//-----------------------------------------------------------------------------

 int PCAP_CAP::Start()
 {
 if (isRunning)
     return 0;
 
 int PCAP_CAP::Start()
 {
 if (isRunning)
     return 0;
 

-DEV_MAP::const_iterator it(devices.begin());
+DEV_MAP::iterator it(devices.begin());

 while (it != devices.end())
     {
     bpf_u_int32 mask;
 while (it != devices.end())
     {
     bpf_u_int32 mask;


@@ -84,7 +121,7 @@ while (it != devices.end())
         }
 
     /* open capture device */
         }
 
     /* open capture device */

-    it->handle = pcap_open_live(dev, SNAP_LEN, 1, 1000, errbuf);
+    it->handle = pcap_open_live(it->device.c_str(), SNAP_LEN, 1, 1000, errbuf);

     if (it->handle == NULL)
         {
         errorStr = "Couldn't open device " + it->device + ": " + errbuf;
     if (it->handle == NULL)
         {
         errorStr = "Couldn't open device " + it->device + ": " + errbuf;


@@ -130,26 +167,18 @@ while (it != devices.end())
 
     it->fd = pcap_get_selectable_fd(it->handle);
     if (it->fd == -1)
 
     it->fd = pcap_get_selectable_fd(it->handle);
     if (it->fd == -1)

-        {

         {
         errorStr = "Couldn't get a file descriptor for " + it->device + ": " + pcap_geterr(it->handle);
         logger(errorStr);
         printfd(__FILE__, "%s\n", errorStr.c_str());
         return -1;
         }
         {
         errorStr = "Couldn't get a file descriptor for " + it->device + ": " + pcap_geterr(it->handle);
         logger(errorStr);
         printfd(__FILE__, "%s\n", errorStr.c_str());
         return -1;
         }

-        }
-    }
-
-nonstop = true;

 
 

-if (pthread_create(&thread, NULL, Run, this))
-    {
-    errorStr = "Cannot create thread.";
-    logger("Cannot create thread.");
-    printfd(__FILE__, "Cannot create thread\n");
-    return -1;
+    ++it;

     }
 
     }
 

+m_thread = std::jthread([this](auto token){ Run(std::move(token)); });
+

 return 0;
 }
 //-----------------------------------------------------------------------------
 return 0;
 }
 //-----------------------------------------------------------------------------


@@ -158,7 +187,7 @@ int PCAP_CAP::Stop()
 if (!isRunning)
     return 0;
 
 if (!isRunning)
     return 0;
 

-nonstop = false;
+m_thread.request_stop();

 
 //5 seconds to thread stops itself
 for (int i = 0; i < 25 && isRunning; i++)
 
 //5 seconds to thread stops itself
 for (int i = 0; i < 25 && isRunning; i++)


@@ -168,69 +197,70 @@ for (int i = 0; i < 25 && isRunning; i++)
     }
 //after 5 seconds waiting thread still running. now killing it
 if (isRunning)
     }
 //after 5 seconds waiting thread still running. now killing it
 if (isRunning)

+    m_thread.detach();
+else
+    m_thread.join();
+
+for (DEV_MAP::iterator it(devices.begin()); it != devices.end(); ++it)

     {
     {

-    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 = "PCAP_CAP not stopped.";
-        logger("Cannot stop thread.");
-        printfd(__FILE__, "Cannot stop thread\n");
-        return -1;
-        }
-    else
-        {
-        pthread_join(thread, NULL);
-        }
+    pcap_freecode(&it->filter);
+    pcap_close(it->handle);

     }
 
 return 0;
 }
 //-----------------------------------------------------------------------------
     }
 
 return 0;
 }
 //-----------------------------------------------------------------------------

-void * PCAP_CAP::Run(void * d)
+void PCAP_CAP::Run(std::stop_token token)

 {
 sigset_t signalSet;
 sigfillset(&signalSet);
 pthread_sigmask(SIG_BLOCK, &signalSet, NULL);
 
 {
 sigset_t signalSet;
 sigfillset(&signalSet);
 pthread_sigmask(SIG_BLOCK, &signalSet, NULL);
 

-PCAP_CAP * dc = static_cast<PCAP_CAP *>(d);
-dc->isRunning = true;
+isRunning = true;

 
 

-struct ETH_IP
-{
-uint16_t    ethHdr[8];
-RAW_PACKET  rp;
-char        padding[4];
-char        padding1[8];
-};
+fd_set fds;
+FD_ZERO(&fds);
+int maxFd = 0;
+for (DEV_MAP::const_iterator it(devices.begin()); it != devices.end(); ++it)
+    {
+    FD_SET(it->fd, &fds);
+    maxFd = std::max(maxFd, it->fd);
+    }

 
 

-char ethip[sizeof(ETH_IP)];
+while (!token.stop_requested())
+    {
+    fd_set rfds = fds;
+    struct timeval tv = {0, 500000};

 
 

-memset(&ethip, 0, sizeof(ETH_IP));
+    if (select(maxFd + 1, &rfds, NULL, NULL, &tv) > 0)
+        TryRead(rfds);
+    }

 
 

-ETH_IP * ethIP = static_cast<ETH_IP *>(static_cast<void *>(&ethip));
-ethIP->rp.dataLen = -1;
+isRunning = false;
+}

 
 

-char * iface = NULL;
+void PCAP_CAP::TryRead(const fd_set & set)
+{
+for (DEV_MAP::const_iterator it(devices.begin()); it != devices.end(); ++it)
+    if (FD_ISSET(it->fd, &set))
+        TryReadDev(*it);
+}

 
 

-while (dc->nonstop)
+void PCAP_CAP::TryReadDev(const DEV & dev)
+{
+struct pcap_pkthdr * header;
+const u_char * packet;
+if (pcap_next_ex(dev.handle, &header, &packet) == -1)

     {
     {

-
-    if (ethIP->ethHdr[7] != 0x8)
-        continue;
-
-    dc->traffCnt->Process(ethIP->rp);
+    printfd(__FILE__, "Failed to read data from '%s': %s\n", dev.device.c_str(), pcap_geterr(dev.handle));
+    return;

     }
 
     }
 

-dc->isRunning = false;
-return NULL;
+const ETH * eth = reinterpret_cast<const ETH *>(packet);
+if (eth->ether_type != 0x8)
+    return;
+
+STG::RawPacket ip;
+memcpy(&ip.rawPacket, packet + 14, sizeof(ip.rawPacket));
+traffCnt->process(ip);

 }
 }