projects/stargazer/plugins/capture/ipq_linux/ipq_cap.cpp

   1 /*
   2  *    This program is free software; you can redistribute it and/or modify
   3  *    it under the terms of the GNU General Public License as published by
   4  *    the Free Software Foundation; either version 2 of the License, or
   5  *    (at your option) any later version.
   6  *
   7  *    This program is distributed in the hope that it will be useful,
   8  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *    GNU General Public License for more details.
  11  *
  12  *    You should have received a copy of the GNU General Public License
  13  *    along with this program; if not, write to the Free Software
  14  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  */
  16
  17 /*
  18 * Author : Boris Mikhailenko <stg34@stargazer.dp.ua>
  19 */
  20
  21 #include <signal.h>
  22 #include <cerrno>
  23 #include <netinet/in.h>
  24 #include <linux/netfilter.h>
  25
  26 #include "stg/raw_ip_packet.h"
  27 #include "stg/traffcounter.h"
  28 #include "stg/plugin_creator.h"
  29 #include "ipq_cap.h"
  30
  31 extern "C"
  32 {
  33 #include "libipq.h"
  34 }
  35
  36 //-----------------------------------------------------------------------------
  37 //-----------------------------------------------------------------------------
  38 //-----------------------------------------------------------------------------
  39 PLUGIN_CREATOR<IPQ_CAP> icc;
  40 //-----------------------------------------------------------------------------
  41 //-----------------------------------------------------------------------------
  42 //-----------------------------------------------------------------------------
  43 PLUGIN * GetPlugin()
  44 {
  45 return icc.GetPlugin();
  46 }
  47 //-----------------------------------------------------------------------------
  48 //-----------------------------------------------------------------------------
  49 //-----------------------------------------------------------------------------
  50 const std::string IPQ_CAP::GetVersion() const
  51 {
  52 return "ipq_cap v.1.2";
  53 }
  54 //-----------------------------------------------------------------------------
  55 IPQ_CAP::IPQ_CAP()
  56     : ipq_h(NULL),
  57       nonstop(false),
  58       isRunning(false),
  59       capSock(-1),
  60       traffCnt(NULL)
  61 {
  62 memset(buf, 0, BUFSIZE);
  63 }
  64 //-----------------------------------------------------------------------------
  65 int IPQ_CAP::Start()
  66 {
  67 if (isRunning)
  68     return 0;
  69 if (IPQCapOpen() < 0)
  70     {
  71     errorStr = "Cannot open socket!";
  72     printfd(__FILE__, "Cannot open socket\n");
  73     return -1;
  74     }
  75 nonstop = true;
  76 if (pthread_create(&thread, NULL, Run, this) == 0)
  77     {
  78     return 0;
  79     }
  80 errorStr = "Cannot create thread.";
  81 printfd(__FILE__, "Cannot create thread\n");
  82 return -1;
  83 }
  84 //-----------------------------------------------------------------------------
  85 int IPQ_CAP::Stop()
  86 {
  87 if (!isRunning)
  88     return 0;
  89 nonstop = false;
  90 //5 seconds to thread stops itself
  91 for (int i = 0; i < 25; i++)
  92     {
  93     if (!isRunning)
  94         break;
  95     usleep(200000);
  96     }
  97 //after 5 seconds waiting thread still running. now killing it
  98 if (isRunning)
  99     {
 100     if (pthread_kill(thread, SIGINT))
 101         {
 102         errorStr = "Cannot kill thread.";
 103         return -1;
 104         }
 105     for (int i = 0; i < 25 && isRunning; ++i)
 106         {
 107         usleep(200000);
 108         }
 109     if (isRunning)
 110         {
 111         printfd(__FILE__, "Thread not stopped\n");
 112         }
 113     else
 114         {
 115         pthread_join(thread, NULL);
 116         }
 117     }
 118 IPQCapClose();
 119 return 0;
 120 }
 121 //-----------------------------------------------------------------------------
 122 void * IPQ_CAP::Run(void * d)
 123 {
 124 RAW_PACKET raw_packet;
 125
 126 IPQ_CAP * dc = (IPQ_CAP *)d;
 127 dc->isRunning = true;
 128 memset(&raw_packet, 0, sizeof(raw_packet));
 129 raw_packet.dataLen = -1;
 130 while (dc->nonstop)
 131     {
 132     int status = dc->IPQCapRead(&raw_packet, 68);
 133     if (status == -1 ||
 134         status == -2 ||
 135         status == -3 ||
 136         status == -4)
 137         continue;
 138     dc->traffCnt->Process(raw_packet);
 139     }
 140 dc->isRunning = false;
 141 return NULL;
 142 }
 143 //-----------------------------------------------------------------------------
 144 int IPQ_CAP::IPQCapOpen()
 145 {
 146 ipq_h = ipq_create_handle(0, PF_INET);
 147 if (ipq_h == NULL)
 148     {
 149     ipq_destroy_handle(ipq_h);
 150     errorStr = "Cannot create ipq handle!";
 151     return -1;
 152     }
 153 int status = ipq_set_mode(ipq_h, IPQ_COPY_PACKET, PAYLOAD_LEN);
 154 if (status < 0)
 155     {
 156     ipq_destroy_handle(ipq_h);
 157     errorStr = "Cannot set IPQ_COPY_PACKET mode!";
 158     return -1;
 159     }
 160 return 0;
 161 }
 162 //-----------------------------------------------------------------------------
 163 int IPQ_CAP::IPQCapClose()
 164 {
 165 ipq_destroy_handle(ipq_h);
 166 return 0;
 167 }
 168 //-----------------------------------------------------------------------------
 169 int IPQ_CAP::IPQCapRead(void * buffer, int blen)
 170 {
 171 memset(buf, 0, BUFSIZE);
 172 int status = ipq_read(ipq_h, buf, BUFSIZE, 1);
 173 if (status == 0)
 174     return -4;
 175 if (errno == EINTR)
 176     return -3;
 177 if (status < 0)
 178     return -1;
 179 if (ipq_message_type(buf) != IPQM_PACKET)
 180     return -2;
 181 static ipq_packet_msg_t * m = ipq_get_packet(buf);
 182 memcpy(buffer, m->payload, blen);
 183 ipq_set_verdict(ipq_h, m->packet_id, NF_ACCEPT, 0, NULL);
 184 return 0;
 185 }
 186 //-----------------------------------------------------------------------------