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/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 "host.h"
  30 #include "netvis.h"
  31 #include "packet.h"
  32 #include "port.h"
  33 #include "resolver.h"
  34
  35 using namespace std;
  36 using namespace Msp;
  37
  38 NetVis::NetVis(int argc, char **argv):
  39         pcap(0),
  40         resolver(0),
  41         wnd(0),
  42         font(0),
  43         max_hosts(1000),
  44         max_visible_hosts(30),
  45         draw_labels(true),
  46         blend(true),
  47         frames(0)
  48 {
  49         if(argc<2)
  50                 throw UsageError("No interface given");
  51         iface = argv[1];
  52
  53         char err[1024];
  54         pcap = pcap_open_live(iface.c_str(), 128, true, 0, err);
  55         if(!pcap)
  56                 throw Exception(err);
  57
  58         if(pcap_setnonblock(pcap, true, err)==-1)
  59                 throw Exception(err);
  60
  61         pcap_lookupnet(iface.c_str(), &localnet, &localnet_mask, err);
  62         localnet = ntohl(localnet);
  63         localnet_mask = ntohl(localnet_mask);
  64
  65         resolver = new Resolver;
  66
  67         wnd = new Graphics::SimpleGLWindow(1024, 768);
  68         wnd->set_title("NetVis");
  69         wnd->signal_close.connect(sigc::bind(sigc::mem_fun(this, &NetVis::exit), 0));
  70         wnd->signal_key_press.connect(sigc::mem_fun(this, &NetVis::key_press));
  71         wnd->show();
  72
  73         GL::enable(GL::BLEND);
  74         GL::blend_func(GL::SRC_ALPHA, GL::ONE_MINUS_SRC_ALPHA);
  75
  76         font = new GL::Font;
  77         DataFile::load(*font, "dejavu-10.font");
  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
 121         float min_activity = numeric_limits<float>::max();
 122         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 123         {
 124                 i->second->tick(dt);
 125                 min_activity = min(min_activity, i->second->get_activity());
 126         }
 127         float del_limit = pow(10, 6-0.1*(max_hosts-hosts.size()-disabled_hosts.size()));
 128         for(map<unsigned, Host *>::iterator i=disabled_hosts.begin(); i!=disabled_hosts.end();)
 129         {
 130                 i->second->tick(dt);
 131
 132                 if(i->second->get_activity()>min_activity)
 133                 {
 134                         i->second->set_active(true);
 135                         hosts.insert(*i);
 136                         disabled_hosts.erase(i++);
 137                 }
 138                 else if(i->second->get_activity()<del_limit)
 139                 {
 140                         delete i->second;
 141                         disabled_hosts.erase(i++);
 142                 }
 143                 else
 144                         ++i;
 145         }
 146
 147         if(hosts.size()>max_visible_hosts)
 148         {
 149                 list<float> activity;
 150                 for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 151                         activity.push_back(i->second->get_activity());
 152                 activity.sort();
 153
 154                 list<float>::iterator j = activity.begin();
 155                 advance(j, activity.size()-max_visible_hosts);
 156                 float limit = *j;
 157
 158                 for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end();)
 159                 {
 160                         if(i->second->get_activity()<limit)
 161                         {
 162                                 i->second->set_active(false);
 163                                 disabled_hosts.insert(*i);
 164                                 hosts.erase(i++);
 165                         }
 166                         else
 167                                 ++i;
 168                 }
 169         }
 170
 171         for(list<Packet *>::iterator i=packets.begin(); i!=packets.end();)
 172         {
 173                 (*i)->tick(dt);
 174                 if((*i)->get_stale())
 175                 {
 176                         delete *i;
 177                         i = packets.erase(i);
 178                 }
 179                 else
 180                         ++i;
 181         }
 182
 183         render();
 184         wnd->swap_buffers();
 185
 186         ++frames;
 187 }
 188
 189 void NetVis::render()
 190 {
 191         GL::clear(GL::COLOR_BUFFER_BIT);
 192
 193         GL::matrix_mode(GL::PROJECTION);
 194         GL::load_identity();
 195         GL::ortho_centered(1024, 768);
 196         GL::matrix_mode(GL::MODELVIEW);
 197         GL::load_identity();
 198
 199         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 200                 i->second->render();
 201         {
 202                 GL::Immediate imm((GL::COLOR4_UBYTE, GL::VERTEX2));
 203                 imm.begin(GL::QUADS);
 204                 for(list<Packet *>::iterator i=packets.begin(); i!=packets.end(); ++i)
 205                         (*i)->render(imm);
 206                 imm.end();
 207         }
 208
 209         GL::push_matrix();
 210         GL::translate(-500, 360, 0);
 211         unsigned n = 0;
 212         for(map<unsigned, Port *>::iterator i=ports.begin(); (i!=ports.end() && n<50); ++i, ++n)
 213         {
 214                 i->second->render();
 215                 GL::translate(0, -12, 0);
 216         }
 217         GL::pop_matrix();
 218
 219         GL::push_matrix();
 220         GL::translate(-500, -360, 0);
 221         GL::scale_uniform(10);
 222         font->draw_string(format("%d hosts", hosts.size()+disabled_hosts.size()));
 223         GL::translate(0, -1.2, 0);
 224         font->draw_string(format("%.2f fps", fps));
 225         GL::Texture::unbind();
 226         GL::pop_matrix();
 227 }
 228
 229 Host &NetVis::get_host(unsigned a)
 230 {
 231         map<unsigned, Host *>::iterator i = hosts.find(a);
 232         if(i!=hosts.end())
 233                 return *i->second;
 234
 235         i = disabled_hosts.find(a);
 236         if(i!=disabled_hosts.end())
 237                 return *i->second;
 238
 239         Host *host = new Host(*this, a);
 240         if((a&localnet_mask)==localnet)
 241                 host->set_local(true);
 242         resolver->push(host);
 243         host->set_position(Vector2(rand()*400.0/RAND_MAX-200.0, rand()*400.0/RAND_MAX-200.0));
 244         hosts[a] = host;
 245         return *host;
 246 }
 247
 248 const Port &NetVis::get_port(unsigned number)
 249 {
 250         map<unsigned, Port *>::iterator i = ports.find(number);
 251         if(i!=ports.end())
 252                 return *i->second;
 253         Port *port = new Port(*this, number);
 254         ports[number] = port;
 255         return *port;
 256 }
 257
 258 void NetVis::key_press(unsigned key, unsigned, wchar_t)
 259 {
 260         if(key==46)
 261                 draw_labels = !draw_labels;
 262         else if(key==56)
 263         {
 264                 blend = !blend;
 265                 GL::set(GL_BLEND, blend);
 266         }
 267 }
 268
 269 void NetVis::capture_handler(unsigned char *user, const pcap_pkthdr *, const unsigned char *data)
 270 {
 271         NetVis *self = reinterpret_cast<NetVis *>(user);
 272
 273         const ethhdr *eth = reinterpret_cast<const ethhdr *>(data);
 274         if(ntohs(eth->h_proto)==ETH_P_IP)
 275         {
 276                 const iphdr *ip = reinterpret_cast<const iphdr *>(eth+1);
 277
 278                 unsigned size = ntohs(ip->tot_len);
 279                 unsigned port = 0;
 280                 if(ip->protocol==IPPROTO_TCP)
 281                 {
 282                         const tcphdr *tcp = reinterpret_cast<const tcphdr *>(ip+1);
 283                         port = min(ntohs(tcp->source), ntohs(tcp->dest));
 284                 }
 285                 else if(ip->protocol==IPPROTO_UDP)
 286                 {
 287                         const udphdr *udp = reinterpret_cast<const udphdr *>(ip+1);
 288                         port = min(ntohs(udp->source), ntohs(udp->dest));
 289                 }
 290                 Host &shost = self->get_host(ntohl(ip->saddr));
 291                 Host *dhost = 0;
 292                 if((ntohl(ip->daddr)&0xFF)!=0xFF)
 293                         dhost = &self->get_host(ntohl(ip->daddr));
 294
 295                 float throttle = shost.send_packet();
 296                 if(throttle<1)
 297                 {
 298                         self->packets.push_back(new Packet(shost, dhost, self->get_port(port).get_color(), size));
 299                         self->packets.back()->tick(-throttle*Msp::Time::sec);
 300                 }
 301
 302                 shost.add_activity(size);
 303                 if(dhost)
 304                         dhost->add_activity(size);
 305         }
 306 }
 307
 308 void NetVis::sighandler(int)
 309 {
 310         exit(0);
 311 }
 312
 313 Application::RegApp<NetVis> NetVis::reg;