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 <iostream>
   9 #include <limits>
  10 #include <cstdlib>
  11 #include <cmath>
  12 #include <signal.h>
  13 #include <netinet/ip.h>
  14 #include <netinet/tcp.h>
  15 #include <netinet/udp.h>
  16 #include <linux/if_ether.h>
  17 #include <msp/core/except.h>
  18 #include <msp/debug/profilingscope.h>
  19 #include <msp/gl/immediate.h>
  20 #include <msp/gl/matrix.h>
  21 #include <msp/gl/misc.h>
  22 #include <msp/gl/projection.h>
  23 #include <msp/gl/texture2d.h>
  24 #include <msp/gl/transform.h>
  25 #include <msp/strings/formatter.h>
  26 #include <msp/time/units.h>
  27 #include <msp/time/utils.h>
  28 #include "host.h"
  29 #include "netvis.h"
  30 #include "packet.h"
  31 #include "resolver.h"
  32
  33 using namespace std;
  34 using namespace Msp;
  35
  36 NetVis::NetVis(int argc, char **argv):
  37         max_hosts(1000),
  38         max_visible_hosts(30),
  39         draw_labels(true),
  40         blend(true),
  41         frames(0)
  42 {
  43         if(argc<2)
  44                 throw UsageError("No interface given");
  45         iface = argv[1];
  46 }
  47
  48 int NetVis::main()
  49 {
  50         char err[1024];
  51         pcap = pcap_open_live(iface.c_str(), 128, true, 0, err);
  52         if(!pcap)
  53                 throw Exception(err);
  54
  55         if(pcap_setnonblock(pcap, true, err)==-1)
  56                 throw Exception(err);
  57
  58         pcap_lookupnet(iface.c_str(), &localnet, &localnet_mask, err);
  59         localnet = ntohl(localnet);
  60         localnet_mask = ntohl(localnet_mask);
  61
  62         dpy = new Graphics::Display;
  63         wnd = new Graphics::Window(*dpy, 1024, 768);
  64         glc = new Graphics::GLContext(*wnd);
  65         wnd->set_title("NetVis");
  66         wnd->signal_close.connect(sigc::bind(sigc::mem_fun(this, &NetVis::exit), 0));
  67         wnd->signal_key_press.connect(sigc::mem_fun(this, &NetVis::key_press));
  68         wnd->show();
  69
  70         GL::enable(GL_BLEND);
  71         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  72
  73         font = new GL::Font;
  74         DataFile::load(*font, "dejavu-10.font");
  75
  76         catch_signal(SIGINT);
  77
  78         resolver = new Resolver;
  79
  80         //set_loop_mode(TICK_BUSY);
  81
  82         Application::main();
  83
  84         delete resolver;
  85
  86         delete font;
  87         delete glc;
  88         delete wnd;
  89         delete dpy;
  90
  91         cout<<hosts.size()+disabled_hosts.size()<<" different hosts seen\n";
  92         cout<<"capture: "<<profiler.scope("capture").total_time<<'\n';
  93         cout<<"tick:    "<<profiler.scope("tick").total_time<<'\n';
  94         cout<<"render:  "<<profiler.scope("render").total_time<<'\n';
  95
  96         pcap_close(pcap);
  97         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
  98                 delete i->second;
  99         for(map<unsigned, Host *>::iterator i=disabled_hosts.begin(); i!=disabled_hosts.end(); ++i)
 100                 delete i->second;
 101         for(list<Packet *>::iterator i=packets.begin(); i!=packets.end(); ++i)
 102                 delete *i;
 103
 104         return exit_code;
 105 }
 106
 107 void NetVis::tick()
 108 {
 109         Msp::Time::TimeStamp t = Msp::Time::now();
 110         Msp::Time::TimeDelta dt;
 111         if(tick_t)
 112                 dt = t-tick_t;
 113         tick_t = t;
 114
 115         if(tick_t>fps_t+Msp::Time::sec)
 116         {
 117                 fps = frames/((tick_t-fps_t)/Msp::Time::sec);
 118                 fps_t = tick_t;
 119                 frames = 0;
 120         }
 121
 122         dpy->tick();
 123
 124         {
 125                 Debug::ProfilingScope s(profiler, "capture");
 126                 while(pcap_dispatch(pcap, -1, &capture_handler, reinterpret_cast<unsigned char *>(this))>0) ;
 127         }
 128
 129         {
 130                 Debug::ProfilingScope s(profiler, "tick");
 131
 132                 resolver->tick();
 133
 134                 float min_activity = numeric_limits<float>::max();
 135                 for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 136                 {
 137                         i->second->tick(dt);
 138                         min_activity = min(min_activity, i->second->get_activity());
 139                 }
 140                 float del_limit = pow(10, 6-0.1*(max_hosts-hosts.size()-disabled_hosts.size()));
 141                 for(map<unsigned, Host *>::iterator i=disabled_hosts.begin(); i!=disabled_hosts.end();)
 142                 {
 143                         i->second->tick(dt);
 144
 145                         if(i->second->get_activity()>min_activity)
 146                         {
 147                                 i->second->set_active(true);
 148                                 hosts.insert(*i);
 149                                 disabled_hosts.erase(i++);
 150                         }
 151                         else if(i->second->get_activity()<del_limit)
 152                         {
 153                                 delete i->second;
 154                                 disabled_hosts.erase(i++);
 155                         }
 156                         else
 157                                 ++i;
 158                 }
 159
 160                 if(hosts.size()>max_visible_hosts)
 161                 {
 162                         list<float> activity;
 163                         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 164                                 activity.push_back(i->second->get_activity());
 165                         activity.sort();
 166
 167                         list<float>::iterator j = activity.begin();
 168                         advance(j, activity.size()-max_visible_hosts);
 169                         float limit = *j;
 170
 171                         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end();)
 172                         {
 173                                 if(i->second->get_activity()<limit)
 174                                 {
 175                                         i->second->set_active(false);
 176                                         disabled_hosts.insert(*i);
 177                                         hosts.erase(i++);
 178                                 }
 179                                 else
 180                                         ++i;
 181                         }
 182                 }
 183
 184                 for(list<Packet *>::iterator i=packets.begin(); i!=packets.end();)
 185                 {
 186                         (*i)->tick(dt);
 187                         if((*i)->get_stale())
 188                         {
 189                                 delete *i;
 190                                 i = packets.erase(i);
 191                         }
 192                         else
 193                                 ++i;
 194                 }
 195         }
 196
 197         {
 198                 Debug::ProfilingScope s(profiler, "render");
 199                 glClear(GL_COLOR_BUFFER_BIT);
 200
 201                 GL::matrix_mode(GL::PROJECTION);
 202                 GL::load_identity();
 203                 GL::ortho_centered(1024, 768);
 204                 GL::matrix_mode(GL::MODELVIEW);
 205                 GL::load_identity();
 206
 207                 for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 208                         i->second->render();
 209                 if(draw_labels)
 210                 {
 211                         glColor4f(1.0, 1.0, 1.0, 1.0);
 212                         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 213                                 i->second->render_label();
 214                         GL::Texture::unbind();
 215                 }
 216                 GL::Immediate imm((GL::COLOR4_UBYTE, GL::VERTEX2));
 217                 imm.begin(GL::QUADS);
 218                 for(list<Packet *>::iterator i=packets.begin(); i!=packets.end(); ++i)
 219                         (*i)->render(imm);
 220                 imm.end();
 221
 222                 GL::push_matrix();
 223                 GL::translate(-500, 360, 0);
 224                 unsigned n = 0;
 225                 for(map<unsigned, GL::Color>::iterator i=port_colors.begin(); (i!=port_colors.end() && n<20); ++i, ++n)
 226                 {
 227                         GL::Color &color = i->second;
 228
 229                         imm.begin(GL::QUADS);
 230                         imm.color(color.r, color.g, color.b, color.a);
 231                         for(unsigned x=0; x<=4; x+=2)
 232                         {
 233                                 imm.vertex(x+0, 0);
 234                                 imm.vertex(x+10, 0);
 235                                 imm.vertex(x+10, 10);
 236                                 imm.vertex(x+0, 10);
 237                         }
 238                         imm.end();
 239
 240                         GL::translate(0, -12, 0);
 241                 }
 242                 GL::pop_matrix();
 243
 244                 GL::push_matrix();
 245                 if(draw_labels)
 246                 {
 247                         GL::push_matrix();
 248                         GL::translate(-484, 361, 0);
 249                         GL::scale_uniform(10);
 250                         glColor4f(1.0, 1.0, 1.0, 1.0);
 251                         n = 0;
 252                         for(map<unsigned, GL::Color>::iterator i=port_colors.begin(); (i!=port_colors.end() && n<20); ++i, ++n)
 253                         {
 254                                 font->draw_string(format("%d", i->first));
 255
 256                                 GL::translate(0, -1.2, 0);
 257                         }
 258                         GL::pop_matrix();
 259                         GL::Texture::unbind();
 260                 }
 261                 GL::pop_matrix();
 262
 263                 GL::push_matrix();
 264                 GL::translate(-500, -360, 0);
 265                 GL::scale_uniform(10);
 266                 font->draw_string(format("%d hosts", hosts.size()+disabled_hosts.size()));
 267                 GL::translate(0, -1.2, 0);
 268                 font->draw_string(format("%.2f fps", fps));
 269                 GL::pop_matrix();
 270                 GL::Texture::unbind();
 271
 272                 glc->swap_buffers();
 273         }
 274
 275         ++frames;
 276 }
 277
 278 Host &NetVis::get_host(unsigned a)
 279 {
 280         map<unsigned, Host *>::iterator i = hosts.find(a);
 281         if(i!=hosts.end())
 282                 return *i->second;
 283
 284         i = disabled_hosts.find(a);
 285         if(i!=disabled_hosts.end())
 286                 return *i->second;
 287
 288         Host *host = new Host(*this, a);
 289         if((a&localnet_mask)==localnet)
 290                 host->set_local(true);
 291         resolver->push(host);
 292         host->set_position(Vector2(rand()*400.0/RAND_MAX-200.0, rand()*400.0/RAND_MAX-200.0));
 293         hosts[a] = host;
 294         return *host;
 295 }
 296
 297 GL::Color &NetVis::get_port_color(unsigned port)
 298 {
 299         map<unsigned, GL::Color>::iterator i = port_colors.find(port);
 300         if(i!=port_colors.end())
 301                 return i->second;
 302
 303         GL::Color color;
 304         while(1)
 305         {
 306                 color.r = rand()*1.0/RAND_MAX;
 307                 color.g = rand()*1.0/RAND_MAX;
 308                 color.b = rand()*1.0/RAND_MAX;
 309                 if(color.r>0.5 || color.g>0.5 || color.b>0.7)
 310                         break;
 311         }
 312         color.a = 0.4f;
 313         return port_colors[port] = color;
 314 }
 315
 316 void NetVis::key_press(unsigned key, unsigned, wchar_t)
 317 {
 318         if(key==46)
 319                 draw_labels = !draw_labels;
 320         else if(key==56)
 321         {
 322                 blend = !blend;
 323                 GL::set(GL_BLEND, blend);
 324         }
 325 }
 326
 327 void NetVis::capture_handler(unsigned char *user, const pcap_pkthdr *, const unsigned char *data)
 328 {
 329         NetVis *self = reinterpret_cast<NetVis *>(user);
 330
 331         const ethhdr *eth = reinterpret_cast<const ethhdr *>(data);
 332         if(ntohs(eth->h_proto)==ETH_P_IP)
 333         {
 334                 const iphdr *ip = reinterpret_cast<const iphdr *>(eth+1);
 335
 336                 unsigned size = ntohs(ip->tot_len);
 337                 unsigned port = 0;
 338                 if(ip->protocol==IPPROTO_TCP)
 339                 {
 340                         const tcphdr *tcp = reinterpret_cast<const tcphdr *>(ip+1);
 341                         port = min(ntohs(tcp->source), ntohs(tcp->dest));
 342                 }
 343                 else if(ip->protocol==IPPROTO_UDP)
 344                 {
 345                         const udphdr *udp = reinterpret_cast<const udphdr *>(ip+1);
 346                         port = min(ntohs(udp->source), ntohs(udp->dest));
 347                 }
 348                 Host &shost = self->get_host(ntohl(ip->saddr));
 349                 Host *dhost = 0;
 350                 if((ntohl(ip->daddr)&0xFF)!=0xFF)
 351                         dhost = &self->get_host(ntohl(ip->daddr));
 352
 353                 float throttle = shost.send_packet();
 354                 if(throttle<1)
 355                 {
 356                         self->packets.push_back(new Packet(shost, dhost, self->get_port_color(port), size));
 357                         self->packets.back()->tick(-throttle*Msp::Time::sec);
 358                 }
 359
 360                 shost.add_activity(size);
 361                 if(dhost)
 362                         dhost->add_activity(size);
 363         }
 364 }
 365
 366 void NetVis::sighandler(int)
 367 {
 368         exit(0);
 369 }
 370
 371 Application::RegApp<NetVis> NetVis::reg;