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                         disabled_hosts.erase(i++);
 139                 }
 140                 else if(i->second->get_activity()<del_limit)
 141                 {
 142                         delete i->second;
 143                         disabled_hosts.erase(i++);
 144                 }
 145                 else
 146                         ++i;
 147         }
 148
 149         if(hosts.size()>max_visible_hosts)
 150         {
 151                 list<float> activity;
 152                 for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 153                         activity.push_back(i->second->get_activity());
 154                 activity.sort();
 155
 156                 list<float>::iterator j = activity.begin();
 157                 advance(j, activity.size()-max_visible_hosts);
 158                 float limit = *j;
 159
 160                 for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end();)
 161                 {
 162                         if(i->second->get_activity()<limit)
 163                         {
 164                                 i->second->set_active(false);
 165                                 disabled_hosts.insert(*i);
 166                                 hosts.erase(i++);
 167                         }
 168                         else
 169                                 ++i;
 170                 }
 171         }
 172
 173         for(list<Packet *>::iterator i=packets.begin(); i!=packets.end();)
 174         {
 175                 (*i)->tick(dt);
 176                 if((*i)->get_stale())
 177                 {
 178                         delete *i;
 179                         i = packets.erase(i);
 180                 }
 181                 else
 182                         ++i;
 183         }
 184
 185         render();
 186         wnd->swap_buffers();
 187
 188         ++frames;
 189 }
 190
 191 void NetVis::render()
 192 {
 193         GL::clear(GL::COLOR_BUFFER_BIT);
 194
 195         GL::matrix_mode(GL::PROJECTION);
 196         GL::load_identity();
 197         GL::ortho_centered(1024, 768);
 198         GL::matrix_mode(GL::MODELVIEW);
 199         GL::load_identity();
 200
 201         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 202                 i->second->render();
 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
 211         GL::push_matrix();
 212         GL::translate(-500, 360, 0);
 213         unsigned n = 0;
 214         for(map<unsigned, Port *>::iterator i=ports.begin(); (i!=ports.end() && n<50); ++i, ++n)
 215         {
 216                 i->second->render();
 217                 GL::translate(0, -12, 0);
 218         }
 219         GL::pop_matrix();
 220
 221         GL::push_matrix();
 222         GL::translate(-500, -360, 0);
 223         GL::scale_uniform(10);
 224         font->draw_string(format("%d hosts", hosts.size()+disabled_hosts.size()));
 225         GL::translate(0, -1.2, 0);
 226         font->draw_string(format("%.2f fps", fps));
 227         GL::Texture::unbind();
 228         GL::pop_matrix();
 229
 230         GL::push_matrix();
 231         GL::translate(170, -370, 0);
 232         history->render();
 233         GL::pop_matrix();
 234 }
 235
 236 Host &NetVis::get_host(unsigned a)
 237 {
 238         map<unsigned, Host *>::iterator i = hosts.find(a);
 239         if(i!=hosts.end())
 240                 return *i->second;
 241
 242         i = disabled_hosts.find(a);
 243         if(i!=disabled_hosts.end())
 244                 return *i->second;
 245
 246         Host *host = new Host(*this, a);
 247         if((a&localnet_mask)==localnet)
 248                 host->set_local(true);
 249         resolver->push(host);
 250         host->set_position(Vector2(rand()*400.0/RAND_MAX-200.0, rand()*400.0/RAND_MAX-200.0));
 251         hosts[a] = host;
 252         return *host;
 253 }
 254
 255 const Port &NetVis::get_port(unsigned number)
 256 {
 257         map<unsigned, Port *>::iterator i = ports.find(number);
 258         if(i!=ports.end())
 259                 return *i->second;
 260         Port *port = new Port(*this, number);
 261         ports[number] = port;
 262         return *port;
 263 }
 264
 265 void NetVis::capture_handler(unsigned char *user, const pcap_pkthdr *, const unsigned char *data)
 266 {
 267         NetVis *self = reinterpret_cast<NetVis *>(user);
 268
 269         const ethhdr *eth = reinterpret_cast<const ethhdr *>(data);
 270         if(ntohs(eth->h_proto)==ETH_P_IP)
 271         {
 272                 const iphdr *ip = reinterpret_cast<const iphdr *>(eth+1);
 273
 274                 unsigned size = ntohs(ip->tot_len);
 275                 unsigned port = 0;
 276                 if(ip->protocol==IPPROTO_TCP)
 277                 {
 278                         const tcphdr *tcp = reinterpret_cast<const tcphdr *>(ip+1);
 279                         port = min(ntohs(tcp->source), ntohs(tcp->dest));
 280                 }
 281                 else if(ip->protocol==IPPROTO_UDP)
 282                 {
 283                         const udphdr *udp = reinterpret_cast<const udphdr *>(ip+1);
 284                         port = min(ntohs(udp->source), ntohs(udp->dest));
 285                 }
 286                 Host &shost = self->get_host(ntohl(ip->saddr));
 287                 Host *dhost = 0;
 288                 if((ntohl(ip->daddr)&0xFF)!=0xFF)
 289                         dhost = &self->get_host(ntohl(ip->daddr));
 290
 291                 float throttle = shost.send_packet();
 292                 if(throttle<1)
 293                 {
 294                         self->packets.push_back(new Packet(shost, dhost, self->get_port(port).get_color(), size));
 295                         self->packets.back()->tick(-throttle*Msp::Time::sec);
 296                 }
 297
 298                 shost.add_activity(size);
 299                 if(dhost)
 300                         dhost->add_activity(size);
 301
 302                 if((ntohl(ip->saddr)&self->localnet_mask)==self->localnet)
 303                         self->history->activity(0, size);
 304                 else if((ntohl(ip->daddr)&self->localnet_mask)==self->localnet)
 305                         self->history->activity(size, 0);
 306         }
 307 }
 308
 309 void NetVis::sighandler(int)
 310 {
 311         exit(0);
 312 }
 313
 314 Application::RegApp<NetVis> NetVis::reg;