source/netvis.cpp

   1 /* $Id$
   2
   3 This file is part of NetVis
   4 Copyright @ 2008 Mikko Rasa, Mikkosoft Productions
   5 Distributed unter the GPL
   6 */
   7
   8 #include <limits>
   9 #include <cstdlib>
  10 #include <cmath>
  11 #include <signal.h>
  12 #include <netinet/ether.h>
  13 #include <netinet/ip.h>
  14 #include <netinet/tcp.h>
  15 #include <netinet/udp.h>
  16 #include <msp/core/except.h>
  17 #include <msp/debug/profilingscope.h>
  18 #include <msp/gl/blend.h>
  19 #include <msp/gl/framebuffer.h>
  20 #include <msp/gl/immediate.h>
  21 #include <msp/gl/matrix.h>
  22 #include <msp/gl/misc.h>
  23 #include <msp/gl/projection.h>
  24 #include <msp/gl/texture2d.h>
  25 #include <msp/gl/transform.h>
  26 #include <msp/strings/formatter.h>
  27 #include <msp/time/units.h>
  28 #include <msp/time/utils.h>
  29 #include "history.h"
  30 #include "host.h"
  31 #include "netvis.h"
  32 #include "packet.h"
  33 #include "port.h"
  34 #include "resolver.h"
  35
  36 using namespace std;
  37 using namespace Msp;
  38
  39 NetVis::NetVis(int argc, char **argv):
  40         pcap(0),
  41         resolver(0),
  42         wnd(0),
  43         font(0),
  44         max_hosts(1000),
  45         max_visible_hosts(30),
  46         frames(0)
  47 {
  48         if(argc<2)
  49                 throw UsageError("No interface given");
  50         iface = argv[1];
  51
  52         char err[1024];
  53         pcap = pcap_open_live(iface.c_str(), 128, true, 0, err);
  54         if(!pcap)
  55                 throw Exception(err);
  56
  57         if(pcap_setnonblock(pcap, true, err)==-1)
  58                 throw Exception(err);
  59
  60         pcap_lookupnet(iface.c_str(), &localnet, &localnet_mask, err);
  61         localnet = ntohl(localnet);
  62         localnet_mask = ntohl(localnet_mask);
  63
  64         resolver = new Resolver;
  65
  66         wnd = new Graphics::SimpleGLWindow(1024, 768);
  67         wnd->set_title("NetVis");
  68         wnd->signal_close.connect(sigc::bind(sigc::mem_fun(this, &NetVis::exit), 0));
  69         wnd->show();
  70
  71         GL::enable(GL::BLEND);
  72         GL::blend_func(GL::SRC_ALPHA, GL::ONE_MINUS_SRC_ALPHA);
  73
  74         font = new GL::Font;
  75         DataFile::load(*font, "dejavu-10.font");
  76
  77         history = new History(*this, 301, 100);
  78
  79         catch_signal(SIGINT);
  80 }
  81
  82 NetVis::~NetVis()
  83 {
  84         delete resolver;
  85
  86         delete font;
  87         delete wnd;
  88
  89         pcap_close(pcap);
  90         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
  91                 delete i->second;
  92         for(map<unsigned, Host *>::iterator i=disabled_hosts.begin(); i!=disabled_hosts.end(); ++i)
  93                 delete i->second;
  94         for(map<unsigned, Port *>::iterator i=ports.begin(); i!=ports.end(); ++i)
  95                 delete i->second;
  96         for(list<Packet *>::iterator i=packets.begin(); i!=packets.end(); ++i)
  97                 delete *i;
  98 }
  99
 100 void NetVis::tick()
 101 {
 102         Msp::Time::TimeStamp t = Msp::Time::now();
 103         Msp::Time::TimeDelta dt;
 104         if(tick_t)
 105                 dt = t-tick_t;
 106         tick_t = t;
 107
 108         if(tick_t>fps_t+Msp::Time::sec)
 109         {
 110                 fps = frames/((tick_t-fps_t)/Msp::Time::sec);
 111                 fps_t = tick_t;
 112                 frames = 0;
 113         }
 114
 115         wnd->get_display().tick();
 116
 117         while(pcap_dispatch(pcap, -1, &capture_handler, reinterpret_cast<unsigned char *>(this))>0) ;
 118
 119         resolver->tick();
 120         history->tick(tick_t);
 121
 122
 123         float min_activity = numeric_limits<float>::max();
 124         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 125         {
 126                 i->second->tick(dt);
 127                 min_activity = min(min_activity, i->second->get_activity());
 128         }
 129         float del_limit = pow(10, 6-0.1*(max_hosts-hosts.size()-disabled_hosts.size()));
 130         for(map<unsigned, Host *>::iterator i=disabled_hosts.begin(); i!=disabled_hosts.end();)
 131         {
 132                 i->second->tick(dt);
 133
 134                 if(i->second->get_activity()>min_activity)
 135                 {
 136                         i->second->set_active(true);
 137                         hosts.insert(*i);
 138                         for(unsigned j=0; j<100; ++j)
 139                                 i->second->tick(100*Time::msec);
 140                         disabled_hosts.erase(i++);
 141                 }
 142                 else if(i->second->get_activity()<del_limit)
 143                 {
 144                         resolver->cancel(i->second);
 145                         delete i->second;
 146                         disabled_hosts.erase(i++);
 147                 }
 148                 else
 149                         ++i;
 150         }
 151
 152         if(hosts.size()>max_visible_hosts)
 153         {
 154                 list<float> activity;
 155                 for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 156                         activity.push_back(i->second->get_activity());
 157                 activity.sort();
 158
 159                 list<float>::iterator j = activity.begin();
 160                 advance(j, activity.size()-max_visible_hosts);
 161                 float limit = *j;
 162
 163                 for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end();)
 164                 {
 165                         if(i->second->get_activity()<limit)
 166                         {
 167                                 i->second->set_active(false);
 168                                 disabled_hosts.insert(*i);
 169                                 hosts.erase(i++);
 170                         }
 171                         else
 172                                 ++i;
 173                 }
 174         }
 175
 176         for(list<Packet *>::iterator i=packets.begin(); i!=packets.end();)
 177         {
 178                 (*i)->tick(dt);
 179                 if((*i)->get_stale())
 180                 {
 181                         delete *i;
 182                         i = packets.erase(i);
 183                 }
 184                 else
 185                         ++i;
 186         }
 187
 188         render();
 189         wnd->swap_buffers();
 190
 191         ++frames;
 192 }
 193
 194 void NetVis::render()
 195 {
 196         GL::clear(GL::COLOR_BUFFER_BIT);
 197
 198         GL::matrix_mode(GL::PROJECTION);
 199         GL::load_identity();
 200         GL::ortho_centered(1024, 768);
 201         GL::matrix_mode(GL::MODELVIEW);
 202         GL::load_identity();
 203
 204         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 205                 i->second->render();
 206         {
 207                 GL::Immediate imm((GL::COLOR4_UBYTE, GL::VERTEX2));
 208                 imm.begin(GL::QUADS);
 209                 for(list<Packet *>::iterator i=packets.begin(); i!=packets.end(); ++i)
 210                         (*i)->render(imm);
 211                 imm.end();
 212         }
 213
 214         GL::push_matrix();
 215         GL::translate(-500, 360, 0);
 216         unsigned n = 0;
 217         for(map<unsigned, Port *>::iterator i=ports.begin(); (i!=ports.end() && n<50); ++i, ++n)
 218         {
 219                 i->second->render();
 220                 GL::translate(0, -12, 0);
 221         }
 222         GL::pop_matrix();
 223
 224         GL::push_matrix();
 225         GL::translate(-500, -360, 0);
 226         GL::scale_uniform(10);
 227         font->draw_string(format("%d hosts", hosts.size()+disabled_hosts.size()));
 228         GL::translate(0, -1.2, 0);
 229         font->draw_string(format("%.2f fps", fps));
 230         GL::Texture::unbind();
 231         GL::pop_matrix();
 232
 233         GL::push_matrix();
 234         GL::translate(170, -370, 0);
 235         history->render();
 236         GL::pop_matrix();
 237 }
 238
 239 Host &NetVis::get_host(unsigned a)
 240 {
 241         map<unsigned, Host *>::iterator i = hosts.find(a);
 242         if(i!=hosts.end())
 243                 return *i->second;
 244
 245         i = disabled_hosts.find(a);
 246         if(i!=disabled_hosts.end())
 247                 return *i->second;
 248
 249         Host *host = new Host(*this, a);
 250         if((a&localnet_mask)==localnet)
 251                 host->set_local(true);
 252         resolver->push(host);
 253         host->set_position(Vector2(rand()*400.0/RAND_MAX-200.0, rand()*400.0/RAND_MAX-200.0));
 254         for(unsigned j=0; j<100; ++j)
 255                 host->tick(100*Time::msec);
 256         hosts[a] = host;
 257         return *host;
 258 }
 259
 260 const Port &NetVis::get_port(unsigned number)
 261 {
 262         map<unsigned, Port *>::iterator i = ports.find(number);
 263         if(i!=ports.end())
 264                 return *i->second;
 265         Port *port = new Port(*this, number);
 266         ports[number] = port;
 267         return *port;
 268 }
 269
 270 void NetVis::capture_handler(unsigned char *user, const pcap_pkthdr *, const unsigned char *data)
 271 {
 272         NetVis *self = reinterpret_cast<NetVis *>(user);
 273
 274         const ethhdr *eth = reinterpret_cast<const ethhdr *>(data);
 275         if(ntohs(eth->h_proto)==ETH_P_IP)
 276         {
 277                 const iphdr *ip = reinterpret_cast<const iphdr *>(eth+1);
 278
 279                 unsigned size = ntohs(ip->tot_len);
 280                 unsigned port = 0;
 281                 if(ip->protocol==IPPROTO_TCP)
 282                 {
 283                         const tcphdr *tcp = reinterpret_cast<const tcphdr *>(ip+1);
 284                         port = min(ntohs(tcp->source), ntohs(tcp->dest));
 285                 }
 286                 else if(ip->protocol==IPPROTO_UDP)
 287                 {
 288                         const udphdr *udp = reinterpret_cast<const udphdr *>(ip+1);
 289                         port = min(ntohs(udp->source), ntohs(udp->dest));
 290                 }
 291                 Host &shost = self->get_host(ntohl(ip->saddr));
 292                 Host *dhost = 0;
 293                 if((ntohl(ip->daddr)&0xFF)!=0xFF)
 294                         dhost = &self->get_host(ntohl(ip->daddr));
 295
 296                 float throttle = shost.send_packet();
 297                 if(throttle<1)
 298                 {
 299                         self->packets.push_back(new Packet(shost, dhost, self->get_port(port).get_color(), size));
 300                         self->packets.back()->tick(-throttle*Msp::Time::sec);
 301                 }
 302
 303                 shost.add_activity(size);
 304                 if(dhost)
 305                         dhost->add_activity(size);
 306
 307                 if((ntohl(ip->saddr)&self->localnet_mask)==self->localnet)
 308                         self->history->activity(0, size);
 309                 else if((ntohl(ip->daddr)&self->localnet_mask)==self->localnet)
 310                         self->history->activity(size, 0);
 311         }
 312 }
 313
 314 void NetVis::sighandler(int)
 315 {
 316         exit(0);
 317 }
 318
 319 Application::RegApp<NetVis> NetVis::reg;