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 <msp/core/getopt.h>
  13 #include <msp/debug/profilingscope.h>
  14 #include <msp/gl/blend.h>
  15 #include <msp/gl/framebuffer.h>
  16 #include <msp/gl/immediate.h>
  17 #include <msp/gl/matrix.h>
  18 #include <msp/gl/misc.h>
  19 #include <msp/gl/projection.h>
  20 #include <msp/gl/texture2d.h>
  21 #include <msp/gl/transform.h>
  22 #include <msp/io/print.h>
  23 #include <msp/strings/format.h>
  24 #include <msp/time/units.h>
  25 #include <msp/time/utils.h>
  26 #include "history.h"
  27 #include "host.h"
  28 #include "netvis.h"
  29 #include "packet.h"
  30 #include "port.h"
  31 #include "resolver.h"
  32
  33 using namespace std;
  34 using namespace Msp;
  35
  36 NetVis::NetVis(int argc, char **argv):
  37         pcap(0),
  38         resolver(0),
  39         wnd(0),
  40         font(0),
  41         max_hosts(1000),
  42         max_visible_hosts(30),
  43         frames(0)
  44 {
  45         if(argc<2)
  46                 throw usage_error("No interface given");
  47         iface = argv[1];
  48
  49         char err[1024];
  50         pcap = pcap_open_live(iface.c_str(), 128, true, 0, err);
  51         if(!pcap)
  52                 throw runtime_error(err);
  53
  54         if(pcap_setnonblock(pcap, true, err)==-1)
  55                 throw runtime_error(err);
  56
  57         pcap_lookupnet(iface.c_str(), &localnet, &localnet_mask, err);
  58         localnet = ntohl(localnet);
  59         localnet_mask = ntohl(localnet_mask);
  60
  61         resolver = new Resolver;
  62
  63         wnd = new Graphics::SimpleGLWindow(1024, 768);
  64         wnd->set_title("NetVis");
  65         wnd->signal_close.connect(sigc::bind(sigc::mem_fun(this, &NetVis::exit), 0));
  66         wnd->show();
  67
  68         GL::Blend::alpha().bind();
  69
  70         font = new GL::Font;
  71         DataFile::load(*font, "dejavu-10.font");
  72
  73         history = new History(*this, 301, 100);
  74
  75         catch_signal(SIGINT);
  76 }
  77
  78 NetVis::~NetVis()
  79 {
  80         delete history;
  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(map<unsigned, Port *>::iterator i=ports.begin(); i!=ports.end(); ++i)
  92                 delete i->second;
  93         for(list<Packet *>::iterator i=packets.begin(); i!=packets.end(); ++i)
  94                 delete *i;
  95 }
  96
  97 void NetVis::tick()
  98 {
  99         Msp::Time::TimeStamp t = Msp::Time::now();
 100         Msp::Time::TimeDelta dt;
 101         if(tick_t)
 102                 dt = t-tick_t;
 103         tick_t = t;
 104
 105         if(tick_t>fps_t+Msp::Time::sec)
 106         {
 107                 fps = frames/((tick_t-fps_t)/Msp::Time::sec);
 108                 fps_t = tick_t;
 109                 frames = 0;
 110         }
 111
 112         wnd->get_display().tick();
 113
 114         while(pcap_dispatch(pcap, -1, &capture_handler, reinterpret_cast<unsigned char *>(this))>0) ;
 115
 116         resolver->tick();
 117         history->tick(tick_t);
 118
 119
 120         float min_activity = numeric_limits<float>::max();
 121         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 122         {
 123                 i->second->tick(dt);
 124                 min_activity = min(min_activity, i->second->get_activity());
 125         }
 126         float del_limit = pow(10, 6-0.1*static_cast<int>(max_hosts-hosts.size()-disabled_hosts.size()));
 127         for(map<unsigned, Host *>::iterator i=disabled_hosts.begin(); i!=disabled_hosts.end();)
 128         {
 129                 i->second->tick(dt);
 130
 131                 if(i->second->get_activity()>min_activity)
 132                 {
 133                         i->second->set_active(true);
 134                         hosts.insert(*i);
 135                         for(unsigned j=0; j<100; ++j)
 136                                 i->second->tick(100*Time::msec);
 137                         disabled_hosts.erase(i++);
 138                 }
 139                 else if(i->second->get_activity()<del_limit)
 140                 {
 141                         resolver->cancel(i->second);
 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(map<unsigned, Port *>::iterator i=ports.begin(); i!=ports.end();)
 174         {
 175                 i->second->tick(dt);
 176
 177                 if(!i->second->is_registered() && i->second->get_activity()<0.1)
 178                 {
 179                         delete i->second;
 180                         ports.erase(i++);
 181                 }
 182                 else
 183                         ++i;
 184         }
 185
 186         for(list<Packet *>::iterator i=packets.begin(); i!=packets.end();)
 187         {
 188                 (*i)->tick(dt);
 189                 if((*i)->get_stale())
 190                 {
 191                         delete *i;
 192                         i = packets.erase(i);
 193                 }
 194                 else
 195                         ++i;
 196         }
 197
 198         render();
 199         wnd->swap_buffers();
 200
 201         ++frames;
 202 }
 203
 204 void NetVis::render()
 205 {
 206         GL::Framebuffer::system().clear(GL::COLOR_BUFFER_BIT);
 207
 208         GL::MatrixStack::projection() = GL::Matrix::ortho_centered(1024, 768);
 209         GL::MatrixStack::modelview() = GL::Matrix();
 210
 211         for(map<unsigned, Host *>::iterator i=hosts.begin(); i!=hosts.end(); ++i)
 212                 i->second->render();
 213         {
 214                 GL::Immediate imm((GL::COLOR4_UBYTE, GL::VERTEX2));
 215                 imm.begin(GL::QUADS);
 216                 for(list<Packet *>::iterator i=packets.begin(); i!=packets.end(); ++i)
 217                         (*i)->render(imm);
 218                 imm.end();
 219         }
 220
 221         GL::MatrixStack::modelview() = GL::Matrix::translation(-500, 360, 0);
 222         unsigned n = 0;
 223         for(map<unsigned, Port *>::iterator i=ports.begin(); (i!=ports.end() && n<50); ++i)
 224         {
 225                 float act = i->second->get_activity();
 226                 if((i->second->is_registered() && act>1) || act>200)
 227                 {
 228                         i->second->render();
 229                         GL::MatrixStack::modelview() *= GL::Matrix::translation(0, -12, 0);
 230                         ++n;
 231                 }
 232         }
 233
 234         GL::MatrixStack::modelview() = GL::Matrix::translation(-500, -348, 0);
 235         GL::MatrixStack::modelview() *= GL::Matrix::scaling(10);
 236         font->draw_string(format("%d hosts", hosts.size()+disabled_hosts.size()));
 237         GL::MatrixStack::modelview() *= GL::Matrix::translation(0, -1.2, 0);
 238         font->draw_string(format("%d ports", ports.size()));
 239         GL::MatrixStack::modelview() *= GL::Matrix::translation(0, -1.2, 0);
 240         font->draw_string(format("%.2f fps", fps));
 241         GL::Texture::unbind();
 242
 243         GL::MatrixStack::modelview() = GL::Matrix::translation(170, -370, 0);
 244         history->render();
 245 }
 246
 247 Host &NetVis::get_host(unsigned a)
 248 {
 249         map<unsigned, Host *>::iterator i = hosts.find(a);
 250         if(i!=hosts.end())
 251                 return *i->second;
 252
 253         i = disabled_hosts.find(a);
 254         if(i!=disabled_hosts.end())
 255                 return *i->second;
 256
 257         Host *host = new Host(*this, a);
 258         if((a&localnet_mask)==localnet)
 259                 host->set_local(true);
 260         resolver->push(host);
 261         host->set_position(Vector2(rand()*400.0/RAND_MAX-200.0, rand()*400.0/RAND_MAX-200.0));
 262         for(unsigned j=0; j<100; ++j)
 263                 host->tick(100*Time::msec);
 264         hosts[a] = host;
 265         return *host;
 266 }
 267
 268 Port &NetVis::get_port(unsigned number)
 269 {
 270         map<unsigned, Port *>::iterator i = ports.find(number);
 271         if(i!=ports.end())
 272                 return *i->second;
 273         Port *port = new Port(*this, number);
 274         ports[number] = port;
 275         return *port;
 276 }
 277
 278 void NetVis::capture_handler(unsigned char *user, const pcap_pkthdr *cap, const unsigned char *data)
 279 {
 280         NetVis *self = reinterpret_cast<NetVis *>(user);
 281
 282         CaptureContext ctx;
 283         ctx.cap_hdr = cap;
 284         const ethhdr *eth = reinterpret_cast<const ethhdr *>(data);
 285         self->handle_ethernet(ctx, eth, cap->caplen);
 286 }
 287
 288 void NetVis::handle_ethernet(CaptureContext &ctx, const ethhdr *eth, unsigned len)
 289 {
 290         ctx.size = ctx.cap_hdr->len-sizeof(ethhdr);
 291
 292         int proto = ntohs(eth->h_proto);
 293         if(proto==ETH_P_IP)
 294         {
 295                 const iphdr *ip = reinterpret_cast<const iphdr *>(eth+1);
 296                 handle_ipv4(ctx, ip, len-sizeof(ethhdr));
 297         }
 298         else
 299                 IO::print("Unknown protocol in eth: %d\n", proto);
 300 }
 301
 302 void NetVis::handle_ipv4(CaptureContext &ctx, const iphdr *ip, unsigned len)
 303 {
 304         ctx.src_host = &get_host(ntohl(ip->saddr));
 305         if((ntohl(ip->daddr)&0xFF)!=0xFF)
 306                 ctx.dst_host = &get_host(ntohl(ip->daddr));
 307
 308         if(ip->protocol==IPPROTO_TCP)
 309         {
 310                 const tcphdr *tcp = reinterpret_cast<const tcphdr *>(ip+1);
 311                 handle_tcp(ctx, tcp, len-sizeof(iphdr));
 312         }
 313         else if(ip->protocol==IPPROTO_UDP)
 314         {
 315                 const udphdr *udp = reinterpret_cast<const udphdr *>(ip+1);
 316                 handle_udp(ctx, udp, len-sizeof(iphdr));
 317         }
 318         else
 319                 IO::print("Unknown protocol in ip: %d\n", ip->protocol);
 320 }
 321
 322
 323 void NetVis::handle_tcp(CaptureContext &ctx, const tcphdr *tcp, unsigned)
 324 {
 325         ctx.src_port = &get_port(ntohs(tcp->source));
 326         ctx.dst_port = &get_port(ntohs(tcp->dest));
 327         handle_packet(ctx);
 328 }
 329
 330 void NetVis::handle_udp(CaptureContext &ctx, const udphdr *udp, unsigned)
 331 {
 332         ctx.src_port = &get_port(ntohs(udp->source));
 333         ctx.dst_port = &get_port(ntohs(udp->dest));
 334         handle_packet(ctx);
 335 }
 336
 337 void NetVis::handle_packet(CaptureContext &ctx)
 338 {
 339         Port *port = 0;
 340         if(ctx.src_port && ctx.dst_port)
 341         {
 342                 if(ctx.src_port->is_registered()!=ctx.dst_port->is_registered())
 343                 {
 344                         if(ctx.src_port->is_registered())
 345                                 port = ctx.src_port;
 346                         else
 347                                 port = ctx.dst_port;
 348                 }
 349                 else if(ctx.src_port->get_number()<ctx.dst_port->get_number())
 350                         port = ctx.src_port;
 351                 else
 352                         port = ctx.dst_port;
 353         }
 354         else
 355                 port = &get_port(0);
 356
 357         float throttle = ctx.src_host->send_packet();
 358         if(throttle<1)
 359         {
 360                 packets.push_back(new Packet(*ctx.src_host, ctx.dst_host, port->get_color(), ctx.size));
 361                 packets.back()->tick(-throttle*Msp::Time::sec);
 362         }
 363
 364         ctx.src_host->add_activity(ctx.size);
 365         if(ctx.dst_host)
 366                 ctx.dst_host->add_activity(ctx.size);
 367
 368         if(ctx.src_port)
 369                 ctx.src_port->add_activity(ctx.size);
 370         if(ctx.dst_port)
 371                 ctx.dst_port->add_activity(ctx.size);
 372
 373         bool local_src = ctx.src_host->is_local();
 374         bool local_dst = (ctx.dst_host && ctx.dst_host->is_local());
 375         if(local_src && !local_dst)
 376                 history->activity(0, ctx.size);
 377         else if(local_dst && !local_src)
 378                 history->activity(ctx.size, 0);
 379 }
 380
 381 void NetVis::sighandler(int)
 382 {
 383         exit(0);
 384 }
 385
 386
 387 NetVis::CaptureContext::CaptureContext():
 388         cap_hdr(0),
 389         src_host(0),
 390         src_port(0),
 391         dst_host(0),
 392         dst_port(0),
 393         size(0)
 394 { }