src/connection.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  Inspire is copyright (C) 2002-2004 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 #include <connection.h>
  18 #include <unistd.h>
  19 #include <fcntl.h>
  20 #include <poll.h>
  21 #include <sys/errno.h>
  22 #include <sys/ioctl.h>
  23 #include <sys/utsname.h>
  24 #include <vector>
  25 #include <string>
  26 #include <deque>
  27 #include <sstream>
  28 #include "inspircd.h"
  29 #include "modules.h"
  30 #include "inspstring.h"
  31
  32 using namespace std;
  33
  34
  35 extern std::vector<Module*> modules;
  36 extern std::vector<ircd_module*> factory;
  37
  38 extern int MODCOUNT;
  39
  40 extern time_t TIME;
  41
  42 connection::connection()
  43 {
  44         fd = 0;
  45 }
  46
  47
  48 bool connection::CreateListener(char* newhost, int p)
  49 {
  50         sockaddr_in host_address;
  51         int flags;
  52         in_addr addy;
  53         int on = 0;
  54         struct linger linger = { 0 };
  55
  56         this->port = p;
  57
  58         fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  59         if (fd <= 0)
  60         {
  61                 return false;
  62         }
  63
  64         setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,(const char*)&on,sizeof(on));
  65         linger.l_onoff = 1;
  66         linger.l_linger = 1;
  67         setsockopt(fd,SOL_SOCKET,SO_LINGER,(const char*)&linger,sizeof(linger));
  68
  69         // attempt to increase socket sendq and recvq as high as its possible
  70         // to get them on linux.
  71         int sendbuf = 32768;
  72         int recvbuf = 32768;
  73         setsockopt(fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
  74         setsockopt(fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
  75
  76         memset((void*)&host_address, 0, sizeof(host_address));
  77
  78         host_address.sin_family = AF_INET;
  79
  80         if (!strcmp(newhost,""))
  81         {
  82                 host_address.sin_addr.s_addr = htonl(INADDR_ANY);
  83         }
  84         else
  85         {
  86                 inet_aton(newhost,&addy);
  87                 host_address.sin_addr = addy;
  88         }
  89
  90         host_address.sin_port = htons(p);
  91
  92         if (bind(fd,(sockaddr*)&host_address,sizeof(host_address))<0)
  93         {
  94                 return false;
  95         }
  96
  97         // make the socket non-blocking
  98         flags = fcntl(fd, F_GETFL, 0);
  99         fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 100
 101         this->port = p;
 102
 103         listen(this->fd,5);
 104
 105         return true;
 106 }
 107
 108 char* ircd_connector::GetServerIP()
 109 {
 110         return this->host;
 111 }
 112
 113 int ircd_connector::GetServerPort()
 114 {
 115         return this->port;
 116 }
 117
 118 bool ircd_connector::SetHostAndPort(char* newhost, int newport)
 119 {
 120         strncpy(this->host,newhost,160);
 121         this->port = newport;
 122         return true;
 123 }
 124
 125 bool ircd_connector::SetHostAddress(char* newhost, int newport)
 126 {
 127         strncpy(this->host,newhost,160);
 128         this->port = newport;
 129         memset((void*)&addr, 0, sizeof(addr));
 130         addr.sin_family = AF_INET;
 131         inet_aton(host,&addr.sin_addr);
 132         addr.sin_port = htons(port);
 133         return true;
 134 }
 135
 136 void ircd_connector::SetServerPort(int p)
 137 {
 138         this->port = p;
 139 }
 140
 141 void ircd_connector::AddBuffer(std::string a)
 142 {
 143         std::string b = "";
 144         for (int i = 0; i < a.length(); i++)
 145                 if (a[i] != '\r')
 146                         b = b + a[i];
 147
 148         std::stringstream stream(ircdbuffer);
 149         stream << b;
 150         log(DEBUG,"AddBuffer: %s",b.c_str());
 151         ircdbuffer = stream.str();
 152 }
 153
 154 bool ircd_connector::BufferIsComplete()
 155 {
 156         for (int i = 0; i < ircdbuffer.length(); i++)
 157                 if (ircdbuffer[i] == '\n')
 158                         return true;
 159         return false;
 160 }
 161
 162 void ircd_connector::ClearBuffer()
 163 {
 164         ircdbuffer = "";
 165 }
 166
 167 std::string ircd_connector::GetBuffer()
 168 {
 169         // Fix by Brain 28th Apr 2005
 170         // seems my stringstream code isnt liked by linux
 171         // EVEN THOUGH IT IS CORRECT! Fixed by using a different
 172         // (SLOWER) algorithm...
 173         char* line = (char*)ircdbuffer.c_str();
 174         std::string ret = "";
 175         while ((*line != '\n') && (strlen(line)))
 176         {
 177                 ret = ret + *line;
 178                 line++;
 179         }
 180         if ((*line == '\n') || (*line == '\r'))
 181                 line++;
 182         ircdbuffer = line;
 183         return ret;
 184 }
 185
 186 bool ircd_connector::MakeOutboundConnection(char* newhost, int newport)
 187 {
 188         log(DEBUG,"MakeOutboundConnection: Original param: %s",newhost);
 189         ClearBuffer();
 190         hostent* hoste = gethostbyname(newhost);
 191         if (!hoste)
 192         {
 193                 log(DEBUG,"MakeOutboundConnection: gethostbyname was NULL, setting %s",newhost);
 194                 this->SetHostAddress(newhost,newport);
 195                 SetHostAndPort(newhost,newport);
 196         }
 197         else
 198         {
 199                 struct in_addr* ia = (in_addr*)hoste->h_addr;
 200                 log(DEBUG,"MakeOutboundConnection: gethostbyname was valid, setting %s",inet_ntoa(*ia));
 201                 this->SetHostAddress(inet_ntoa(*ia),newport);
 202                 SetHostAndPort(inet_ntoa(*ia),newport);
 203         }
 204
 205         this->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 206         if (this->fd >= 0)
 207         {
 208                 if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)))
 209                 {
 210                         WriteOpers("connect() failed for %s",host);
 211                         RemoveServer(this->servername.c_str());
 212                         return false;
 213                 }
 214                 int flags = fcntl(this->fd, F_GETFL, 0);
 215                 fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 216                 int sendbuf = 32768;
 217                 int recvbuf = 32768;
 218                 setsockopt(this->fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 219                 setsockopt(this->fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 220                 return true;
 221         }
 222         else
 223         {
 224                 WriteOpers("socket() failed!");
 225                 RemoveServer(this->servername.c_str());
 226         }
 227
 228         return false;
 229 }
 230
 231
 232 bool connection::BeginLink(char* targethost, int newport, char* password, char* servername, int myport)
 233 {
 234         char connect[MAXBUF];
 235
 236         ircd_connector connector;
 237         ircd_connector *cn = this->FindHost(servername);
 238
 239
 240         if (cn)
 241         {
 242                 WriteOpers("CONNECT aborted: Server %s already exists",servername);
 243                 return false;
 244         }
 245
 246
 247         if (this->fd)
 248         {
 249                 if (connector.MakeOutboundConnection(targethost,newport))
 250                 {
 251                         // targethost has been turned into an ip...
 252                         // we dont want this as the server name.
 253                         connector.SetServerName(servername);
 254                         snprintf(connect,MAXBUF,"S %s %s %lu %lu :%s",getservername().c_str(),password,(unsigned long)myport,(unsigned long)GetRevision(),getserverdesc().c_str());
 255                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 256                         connector.SetHostAndPort(targethost, newport);
 257                         this->connectors.push_back(connector);
 258                         return this->SendPacket(connect, servername);
 259                 }
 260                 else
 261                 {
 262                         connector.SetState(STATE_DISCONNECTED);
 263                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 264                 }
 265         }
 266         return false;
 267 }
 268
 269 bool connection::MeshCookie(char* targethost, int newport, unsigned long cookie, char* servername)
 270 {
 271         char connect[MAXBUF];
 272
 273         ircd_connector connector;
 274
 275         WriteOpers("Establishing meshed link to %s:%d",servername,newport);
 276
 277         if (this->fd)
 278         {
 279                 if (connector.MakeOutboundConnection(targethost,newport))
 280                 {
 281                         // targethost has been turned into an ip...
 282                         // we dont want this as the server name.
 283                         connector.SetServerName(servername);
 284                         snprintf(connect,MAXBUF,"- %lu %s :%s",cookie,getservername().c_str(),getserverdesc().c_str());
 285                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 286                         connector.SetHostAndPort(targethost, newport);
 287                         connector.SetState(STATE_CONNECTED);
 288                         this->connectors.push_back(connector);
 289                         return this->SendPacket(connect, servername);
 290                 }
 291                 else
 292                 {
 293                         connector.SetState(STATE_DISCONNECTED);
 294                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 295                 }
 296         }
 297         return false;
 298 }
 299
 300 bool connection::AddIncoming(int newfd, char* targethost, int sourceport)
 301 {
 302         ircd_connector connector;
 303
 304         // targethost has been turned into an ip...
 305         // we dont want this as the server name.
 306         connector.SetServerName(targethost);
 307         connector.SetDescriptor(newfd);
 308         connector.SetState(STATE_NOAUTH_INBOUND);
 309         int flags = fcntl(newfd, F_GETFL, 0);
 310         fcntl(newfd, F_SETFL, flags | O_NONBLOCK);
 311         int sendbuf = 32768;
 312         int recvbuf = 32768;
 313         setsockopt(newfd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 314         setsockopt(newfd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 315         connector.SetHostAndPort(targethost, sourceport);
 316         connector.SetState(STATE_NOAUTH_INBOUND);
 317         log(DEBUG,"connection::AddIncoming() Added connection: %s:%d",targethost,sourceport);
 318         this->connectors.push_back(connector);
 319         return true;
 320 }
 321
 322 void connection::TerminateLink(char* targethost)
 323 {
 324         // this locates the targethost in the connection::connectors vector of the class,
 325         // and terminates it by sending it an SQUIT token and closing its descriptor.
 326         // TerminateLink with a null string causes a terminate of ALL links
 327 }
 328
 329
 330 // Returns a pointer to the connector for 'host'
 331 ircd_connector* connection::FindHost(std::string findhost)
 332 {
 333         for (int i = 0; i < this->connectors.size(); i++)
 334         {
 335                 if (this->connectors[i].GetServerName() == findhost)
 336                 {
 337                         return &this->connectors[i];
 338                 }
 339         }
 340         return NULL;
 341 }
 342
 343 std::string ircd_connector::GetServerName()
 344 {
 345         return this->servername;
 346 }
 347
 348 std::string ircd_connector::GetDescription()
 349 {
 350         return this->description;
 351 }
 352
 353 void ircd_connector::SetServerName(std::string serv)
 354 {
 355         this->servername = serv;
 356 }
 357
 358 void ircd_connector::SetDescription(std::string desc)
 359 {
 360         this->description = desc;
 361 }
 362
 363
 364 int ircd_connector::GetDescriptor()
 365 {
 366         return this->fd;
 367 }
 368
 369 int ircd_connector::GetState()
 370 {
 371         return this->state;
 372 }
 373
 374
 375 void ircd_connector::SetState(int newstate)
 376 {
 377         this->state = newstate;
 378         if (state == STATE_DISCONNECTED)
 379         {
 380                 NetSendMyRoutingTable();
 381         }
 382 }
 383
 384 void ircd_connector::CloseConnection()
 385 {
 386         int flags = fcntl(this->fd, F_GETFL, 0);
 387         fcntl(this->fd, F_SETFL, flags ^ O_NONBLOCK);
 388         close(this->fd);
 389         flags = fcntl(this->fd, F_GETFL, 0);
 390         fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 391 }
 392
 393 void ircd_connector::SetDescriptor(int newfd)
 394 {
 395         this->fd = newfd;
 396 }
 397
 398 bool connection::SendPacket(char *message, const char* sendhost)
 399 {
 400         if ((!message) || (!sendhost))
 401                 return true;
 402
 403         ircd_connector* cn = this->FindHost(sendhost);
 404
 405         if (!strchr(message,'\n'))
 406         {
 407                 strlcat(message,"\n",MAXBUF);
 408         }
 409
 410         if (cn)
 411         {
 412                 log(DEBUG,"main: Connection::SendPacket() sent '%s' to %s",message,cn->GetServerName().c_str());
 413
 414                 if (cn->GetState() == STATE_DISCONNECTED)
 415                 {
 416                         log(DEBUG,"\n\n\n\nMain route to %s is down, seeking alternative\n\n\n\n",sendhost);
 417                         // fix: can only route one hop to avoid a loop
 418                         if (strncmp(message,"R ",2))
 419                         {
 420                                 log(DEBUG,"Not a double reroute");
 421                                 // this route is down, we must re-route the packet through an available point in the mesh.
 422                                 for (int k = 0; k < this->connectors.size(); k++)
 423                                 {
 424                                         log(DEBUG,"Check connector %d: %s",k,this->connectors[k].GetServerName().c_str());
 425                                         // search for another point in the mesh which can 'reach' where we want to go
 426                                         for (int m = 0; m < this->connectors[k].routes.size(); m++)
 427                                         {
 428                                                 log(DEBUG,"Check connector %d: %s route %s",k,this->connectors[k].GetServerName().c_str(),this->connectors[k].routes[m].c_str());
 429                                                 if (!strcasecmp(this->connectors[k].routes[m].c_str(),sendhost))
 430                                                 {
 431                                                         log(DEBUG,"Found alternative route for packet: %s",this->connectors[k].GetServerName().c_str());
 432                                                         char buffer[MAXBUF];
 433                                                         snprintf(buffer,MAXBUF,"R %s %s",sendhost,message);
 434                                                         this->SendPacket(buffer,this->connectors[k].GetServerName().c_str());
 435                                                         return true;
 436                                                 }
 437                                         }
 438                                 }
 439                         }
 440                         char buffer[MAXBUF];
 441                         snprintf(buffer,MAXBUF,"& %s",sendhost);
 442                         NetSendToAllExcept(sendhost,buffer);
 443                         log(DEBUG,"\n\nThere are no routes to %s, we're gonna boot the server off!\n\n",sendhost);
 444                         DoSplit(sendhost);
 445                         return false;
 446                 }
 447
 448                 // returns false if the packet could not be sent (e.g. target host down)
 449                 if (send(cn->GetDescriptor(),message,strlen(message),0)<0)
 450                 {
 451                         log(DEBUG,"send() failed for Connection::SendPacket(): %s",strerror(errno));
 452                         log(DEBUG,"Disabling connector: %s",cn->GetServerName().c_str());
 453                         cn->CloseConnection();
 454                         cn->SetState(STATE_DISCONNECTED);
 455                         // retry the packet along a new route so either arrival OR failure are gauranteed (bugfix)
 456                         return this->SendPacket(message,sendhost);
 457                 }
 458                 return true;
 459         }
 460 }
 461
 462 // receives a packet from any where there is data waiting, first come, first served
 463 // fills the message and host values with the host where the data came from.
 464
 465 bool connection::RecvPacket(std::deque<std::string> &messages, char* recvhost)
 466 {
 467         char data[4096];
 468         memset(data, 0, 4096);
 469         for (int i = 0; i < this->connectors.size(); i++)
 470         {
 471                 if (this->connectors[i].GetState() != STATE_DISCONNECTED)
 472                 {
 473                         // returns false if the packet could not be sent (e.g. target host down)
 474                         int rcvsize = 0;
 475
 476                         // check if theres any data on this socket
 477                         // if not, continue onwards to the next.
 478                         pollfd polls;
 479                         polls.fd = this->connectors[i].GetDescriptor();
 480                         polls.events = POLLIN;
 481                         int ret = poll(&polls,1,1);
 482                         if (ret <= 0) continue;
 483
 484                         rcvsize = recv(this->connectors[i].GetDescriptor(),data,4096,0);
 485                         data[rcvsize] = '\0';
 486                         if (rcvsize == -1)
 487                         {
 488                                 if (errno != EAGAIN)
 489                                 {
 490                                         log(DEBUG,"recv() failed for Connection::RecvPacket(): %s",strerror(errno));
 491                                         log(DEBUG,"Disabling connector: %s",this->connectors[i].GetServerName().c_str());
 492                                         this->connectors[i].CloseConnection();
 493                                         this->connectors[i].SetState(STATE_DISCONNECTED);
 494                                 }
 495                         }
 496                         int pushed = 0;
 497                         if (rcvsize > 0)
 498                         {
 499                                 this->connectors[i].AddBuffer(data);
 500                                 if (this->connectors[i].BufferIsComplete())
 501                                 {
 502                                         while (this->connectors[i].BufferIsComplete())
 503                                         {
 504                                                 std::string text = this->connectors[i].GetBuffer();
 505                                                 if (text != "")
 506                                                 {
 507                                                         messages.push_back(text.c_str());
 508                                                         strlcpy(recvhost,this->connectors[i].GetServerName().c_str(),160);
 509                                                         log(DEBUG,"main: Connection::RecvPacket() %d:%s->%s",pushed++,recvhost,text.c_str());
 510                                                 }
 511                                         }
 512                                         return true;
 513                                 }
 514                         }
 515                 }
 516         }
 517         // nothing new yet -- message and host will be undefined
 518         return false;
 519 }
 520
 521 long connection::GenKey()
 522 {
 523         return (random()*time(NULL));
 524 }
 525