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       errorStr(),
  58       thread(),
  59       nonstop(false),
  60       isRunning(false),
  61       capSock(-1),
  62       traffCnt(NULL),
  63       buf()
  64 {
  65 memset(buf, 0, BUFSIZE);
  66 }
  67 //-----------------------------------------------------------------------------
  68 int IPQ_CAP::Start()
  69 {
  70 if (isRunning)
  71     return 0;
  72 if (IPQCapOpen() < 0)
  73     {
  74     errorStr = "Cannot open socket!";
  75     printfd(__FILE__, "Cannot open socket\n");
  76     return -1;
  77     }
  78 nonstop = true;
  79 if (pthread_create(&thread, NULL, Run, this) == 0)
  80     {
  81     return 0;
  82     }
  83 errorStr = "Cannot create thread.";
  84 printfd(__FILE__, "Cannot create thread\n");
  85 return -1;
  86 }
  87 //-----------------------------------------------------------------------------
  88 int IPQ_CAP::Stop()
  89 {
  90 if (!isRunning)
  91     return 0;
  92 nonstop = false;
  93 //5 seconds to thread stops itself
  94 for (int i = 0; i < 25; i++)
  95     {
  96     if (!isRunning)
  97         break;
  98     usleep(200000);
  99     }
 100 //after 5 seconds waiting thread still running. now killing it
 101 if (isRunning)
 102     {
 103     if (pthread_kill(thread, SIGINT))
 104         {
 105         errorStr = "Cannot kill thread.";
 106         return -1;
 107         }
 108     for (int i = 0; i < 25 && isRunning; ++i)
 109         {
 110         usleep(200000);
 111         }
 112     if (isRunning)
 113         {
 114         printfd(__FILE__, "Thread not stopped\n");
 115         }
 116     else
 117         {
 118         pthread_join(thread, NULL);
 119         }
 120     }
 121 IPQCapClose();
 122 return 0;
 123 }
 124 //-----------------------------------------------------------------------------
 125 void * IPQ_CAP::Run(void * d)
 126 {
 127 RAW_PACKET raw_packet;
 128
 129 IPQ_CAP * dc = (IPQ_CAP *)d;
 130 dc->isRunning = true;
 131 memset(&raw_packet, 0, sizeof(raw_packet));
 132 raw_packet.dataLen = -1;
 133 while (dc->nonstop)
 134     {
 135     int status = dc->IPQCapRead(&raw_packet, 68);
 136     if (status == -1 ||
 137         status == -2 ||
 138         status == -3 ||
 139         status == -4)
 140         continue;
 141     dc->traffCnt->Process(raw_packet);
 142     }
 143 dc->isRunning = false;
 144 return NULL;
 145 }
 146 //-----------------------------------------------------------------------------
 147 int IPQ_CAP::IPQCapOpen()
 148 {
 149 ipq_h = ipq_create_handle(0, PF_INET);
 150 if (ipq_h == NULL)
 151     {
 152     ipq_destroy_handle(ipq_h);
 153     errorStr = "Cannot create ipq handle!";
 154     return -1;
 155     }
 156 int status = ipq_set_mode(ipq_h, IPQ_COPY_PACKET, PAYLOAD_LEN);
 157 if (status < 0)
 158     {
 159     ipq_destroy_handle(ipq_h);
 160     errorStr = "Cannot set IPQ_COPY_PACKET mode!";
 161     return -1;
 162     }
 163 return 0;
 164 }
 165 //-----------------------------------------------------------------------------
 166 int IPQ_CAP::IPQCapClose()
 167 {
 168 ipq_destroy_handle(ipq_h);
 169 return 0;
 170 }
 171 //-----------------------------------------------------------------------------
 172 int IPQ_CAP::IPQCapRead(void * buffer, int blen)
 173 {
 174 memset(buf, 0, BUFSIZE);
 175 int status = ipq_read(ipq_h, buf, BUFSIZE, 1);
 176 if (status == 0)
 177     return -4;
 178 if (errno == EINTR)
 179     return -3;
 180 if (status < 0)
 181     return -1;
 182 if (ipq_message_type(buf) != IPQM_PACKET)
 183     return -2;
 184 static ipq_packet_msg_t * m = ipq_get_packet(buf);
 185 memcpy(buffer, m->payload, blen);
 186 ipq_set_verdict(ipq_h, m->packet_id, NF_ACCEPT, 0, NULL);
 187 return 0;
 188 }
 189 //-----------------------------------------------------------------------------