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.
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.
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
18 * Author : Boris Mikhailenko <stg34@stg.dp.ua>
23 $Date: 2010/09/10 06:43:03 $
26 #include "divert_cap.h"
28 #include "stg/traffcounter.h"
29 #include "stg/raw_ip_packet.h"
30 #include "stg/common.h"
41 #include <sys/types.h>
42 #include <sys/socket.h>
43 #include <netinet/in.h>
47 #include <sys/ioctl.h>
53 #define BUFF_LEN (16384) /* max mtu -> lo=16436 TODO why?*/
55 //-----------------------------------------------------------------------------
61 //-----------------------------------------------------------------------------
63 DIVERT_DATA cddiv; //capture data
64 //-----------------------------------------------------------------------------
65 //-----------------------------------------------------------------------------
66 //-----------------------------------------------------------------------------
68 extern "C" STG::Plugin* GetPlugin()
70 static DIVERT_CAP plugin;
73 //-----------------------------------------------------------------------------
74 //-----------------------------------------------------------------------------
75 //-----------------------------------------------------------------------------
76 std::string DIVERT_CAP::GetVersion() const
78 return "cap_divert v.1.0";
80 //-----------------------------------------------------------------------------
81 DIVERT_CAP::DIVERT_CAP()
83 disableForwarding(false),
86 logger(STG::PluginLogger::get("cap_divert"))
89 //-----------------------------------------------------------------------------
90 int DIVERT_CAP::Start()
95 if (DivertCapOpen() < 0)
97 errorStr = "Cannot open socket!";
98 printfd(__FILE__, "Cannot open socket\n");
102 m_thread = std::jthread([](auto token){ Run(std::move(token)); });
106 //-----------------------------------------------------------------------------
107 int DIVERT_CAP::Stop()
114 m_thread.request_stop();
115 //5 seconds to thread stops itself
116 for (size_t i = 0; i < 25; i++)
121 struct timespec ts = {0, 200000000};
122 nanosleep(&ts, NULL);
125 //after 5 seconds waiting thread still running. now killing it
133 //-----------------------------------------------------------------------------
134 void DIVERT_CAP::Run(std::stop_token token) noexcept
137 sigfillset(&signalSet);
138 pthread_sigmask(SIG_BLOCK, &signalSet, NULL);
142 char buffer[STG::packetSize + 14];
143 while (!token.stop_requested())
146 DivertCapRead(buffer, sizeof(buffer), NULL);
148 if (buffer[12] != 0x8)
151 memcpy(&rp.rawPacket, &buffer[14], STG::packetSize);
153 traffCnt->process(rp);
158 //-----------------------------------------------------------------------------
159 int DIVERT_CAP::DivertCapOpen()
161 memset(&pollddiv, 0, sizeof(pollddiv));
162 memset(&cddiv, 0, sizeof(DIVERT_DATA));
164 strcpy(cddiv.iface, "foo");
168 pollddiv.events = POLLIN;
169 pollddiv.fd = cddiv.sock;
173 //-----------------------------------------------------------------------------
174 int DIVERT_CAP::DivertCapOpen(int)
177 cddiv.sock = socket(PF_INET, SOCK_RAW, IPPROTO_DIVERT);
180 errorStr = "Create divert socket error.";
181 logger("Cannot create a socket: %s", strerror(errno));
182 printfd(__FILE__, "Cannot create divert socket\n");
186 struct sockaddr_in divAddr;
188 memset(&divAddr, 0, sizeof(divAddr));
190 divAddr.sin_family = AF_INET;
191 divAddr.sin_port = htons(cddiv.port);
192 divAddr.sin_addr.s_addr = INADDR_ANY;
194 ret = bind(cddiv.sock, (struct sockaddr *)&divAddr, sizeof(divAddr));
198 errorStr = "Bind divert socket error.";
199 logger("Cannot bind the scoket: %s", strerror(errno));
200 printfd(__FILE__, "Cannot bind divert socket\n");
206 //-----------------------------------------------------------------------------
207 int DIVERT_CAP::DivertCapRead(char * b, int blen, char ** iface)
209 poll(&pollddiv, 1, -1);
211 if (pollddiv.revents & POLLIN)
213 DivertCapRead(b, blen, iface, 0);
214 pollddiv.revents = 0;
220 //-----------------------------------------------------------------------------
221 int DIVERT_CAP::DivertCapRead(char * b, int blen, char ** iface, int)
223 static char buf[BUFF_LEN];
224 static struct sockaddr_in divertaddr;
226 static socklen_t divertaddrSize = sizeof(divertaddr);
228 if ((bytes = recvfrom (cddiv.sock, buf, BUFF_LEN,
229 0, (struct sockaddr*) &divertaddr, &divertaddrSize)) > 50)
231 memcpy(b + 14, buf, blen - 14);
235 *iface = cddiv.iface;
237 if (!disableForwarding)
239 if (sendto(cddiv.sock, buf, bytes, 0, (struct sockaddr*)&divertaddr, divertaddrSize) < 0)
240 logger("sendto error: %s", strerror(errno));
246 logger("recvfrom error: %s", strerror(errno));
251 //-----------------------------------------------------------------------------
252 int DIVERT_CAP::DivertCapClose()
257 //-----------------------------------------------------------------------------
258 int DIVERT_CAP::ParseSettings()
262 std::vector<STG::ParamValue>::const_iterator pvi;
265 pvi = std::find(settings.moduleParams.begin(), settings.moduleParams.end(), pv);
266 if (pvi == settings.moduleParams.end() || pvi->value.empty())
270 else if (ParseIntInRange(pvi->value[0], 1, 65535, &p))
272 errorStr = "Cannot parse parameter \'Port\': " + errorStr;
273 printfd(__FILE__, "Cannot parse parameter 'Port'\n");
280 pv.param = "DisableForwarding";
281 pvi = std::find(settings.moduleParams.begin(), settings.moduleParams.end(), pv);
282 if (pvi == settings.moduleParams.end() || pvi->value.empty())
284 disableForwarding = false;
286 else if (ParseYesNo(pvi->value[0], &d))
288 errorStr = "Cannot parse parameter \'DisableForwarding\': " + errorStr;
289 printfd(__FILE__, "Cannot parse parameter 'DisableForwarding'\n");
293 disableForwarding = d;
297 //-----------------------------------------------------------------------------