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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 <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 //-----------------------------------------------------------------------------