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[stg.git] / 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 //-----------------------------------------------------------------------------