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