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 <netinet/in.h>
  22 #include <linux/netfilter.h>
  23
  24 #include <csignal>
  25 #include <cerrno>
  26
  27 #include "stg/raw_ip_packet.h"
  28 #include "stg/traffcounter.h"
  29 #include "stg/plugin_creator.h"
  30 #include "stg/common.h"
  31
  32 #include "ipq_cap.h"
  33
  34 extern "C"
  35 {
  36 #include "libipq.h"
  37 }
  38
  39 //-----------------------------------------------------------------------------
  40 //-----------------------------------------------------------------------------
  41 //-----------------------------------------------------------------------------
  42 PLUGIN_CREATOR<IPQ_CAP> icc;
  43 //-----------------------------------------------------------------------------
  44 //-----------------------------------------------------------------------------
  45 //-----------------------------------------------------------------------------
  46 PLUGIN * GetPlugin()
  47 {
  48 return icc.GetPlugin();
  49 }
  50 //-----------------------------------------------------------------------------
  51 //-----------------------------------------------------------------------------
  52 //-----------------------------------------------------------------------------
  53 const std::string IPQ_CAP::GetVersion() const
  54 {
  55 return "ipq_cap v.1.2";
  56 }
  57 //-----------------------------------------------------------------------------
  58 IPQ_CAP::IPQ_CAP()
  59     : ipq_h(NULL),
  60       errorStr(),
  61       thread(),
  62       nonstop(false),
  63       isRunning(false),
  64       capSock(-1),
  65       traffCnt(NULL),
  66       buf()
  67 {
  68 memset(buf, 0, BUFSIZE);
  69 }
  70 //-----------------------------------------------------------------------------
  71 int IPQ_CAP::Start()
  72 {
  73 if (isRunning)
  74     return 0;
  75 if (IPQCapOpen() < 0)
  76     {
  77     errorStr = "Cannot open socket!";
  78     printfd(__FILE__, "Cannot open socket\n");
  79     return -1;
  80     }
  81 nonstop = true;
  82 if (pthread_create(&thread, NULL, Run, this) == 0)
  83     {
  84     return 0;
  85     }
  86 errorStr = "Cannot create thread.";
  87 printfd(__FILE__, "Cannot create thread\n");
  88 return -1;
  89 }
  90 //-----------------------------------------------------------------------------
  91 int IPQ_CAP::Stop()
  92 {
  93 if (!isRunning)
  94     return 0;
  95 nonstop = false;
  96 //5 seconds to thread stops itself
  97 for (int i = 0; i < 25; i++)
  98     {
  99     if (!isRunning)
 100         break;
 101     struct timespec ts = {0, 200000000};
 102     nanosleep(&ts, NULL);
 103     }
 104 //after 5 seconds waiting thread still running. now killing it
 105 if (isRunning)
 106     {
 107     if (pthread_kill(thread, SIGINT))
 108         {
 109         errorStr = "Cannot kill thread.";
 110         return -1;
 111         }
 112     for (int i = 0; i < 25 && isRunning; ++i)
 113         {
 114         struct timespec ts = {0, 200000000};
 115         nanosleep(&ts, NULL);
 116         }
 117     if (isRunning)
 118         {
 119         printfd(__FILE__, "Thread not stopped\n");
 120         }
 121     else
 122         {
 123         pthread_join(thread, NULL);
 124         }
 125     }
 126 IPQCapClose();
 127 return 0;
 128 }
 129 //-----------------------------------------------------------------------------
 130 void * IPQ_CAP::Run(void * d)
 131 {
 132 sigset_t signalSet;
 133 sigfillset(&signalSet);
 134 pthread_sigmask(SIG_BLOCK, &signalSet, NULL);
 135
 136 RAW_PACKET raw_packet;
 137
 138 IPQ_CAP * dc = static_cast<IPQ_CAP *>(d);
 139 dc->isRunning = true;
 140 memset(&raw_packet, 0, sizeof(raw_packet));
 141 raw_packet.dataLen = -1;
 142 while (dc->nonstop)
 143     {
 144     int status = dc->IPQCapRead(&raw_packet, 68);
 145     if (status == -1 ||
 146         status == -2 ||
 147         status == -3 ||
 148         status == -4)
 149         continue;
 150     dc->traffCnt->Process(raw_packet);
 151     }
 152 dc->isRunning = false;
 153 return NULL;
 154 }
 155 //-----------------------------------------------------------------------------
 156 int IPQ_CAP::IPQCapOpen()
 157 {
 158 ipq_h = ipq_create_handle(0, PF_INET);
 159 if (ipq_h == NULL)
 160     {
 161     ipq_destroy_handle(ipq_h);
 162     errorStr = "Cannot create ipq handle!";
 163     return -1;
 164     }
 165 int status = ipq_set_mode(ipq_h, IPQ_COPY_PACKET, PAYLOAD_LEN);
 166 if (status < 0)
 167     {
 168     ipq_destroy_handle(ipq_h);
 169     errorStr = "Cannot set IPQ_COPY_PACKET mode!";
 170     return -1;
 171     }
 172 return 0;
 173 }
 174 //-----------------------------------------------------------------------------
 175 int IPQ_CAP::IPQCapClose()
 176 {
 177 ipq_destroy_handle(ipq_h);
 178 return 0;
 179 }
 180 //-----------------------------------------------------------------------------
 181 int IPQ_CAP::IPQCapRead(void * buffer, int blen)
 182 {
 183 memset(buf, 0, BUFSIZE);
 184 int status = ipq_read(ipq_h, buf, BUFSIZE, 1);
 185 if (status == 0)
 186     return -4;
 187 if (errno == EINTR)
 188     return -3;
 189 if (status < 0)
 190     return -1;
 191 if (ipq_message_type(buf) != IPQM_PACKET)
 192     return -2;
 193 static ipq_packet_msg_t * m = ipq_get_packet(buf);
 194 memcpy(buffer, m->payload, blen);
 195 ipq_set_verdict(ipq_h, m->packet_id, NF_ACCEPT, 0, NULL);
 196 return 0;
 197 }
 198 //-----------------------------------------------------------------------------