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 std::deque<std::string> xsums;
  39
  40 extern int MODCOUNT;
  41
  42 extern time_t TIME;
  43
  44
  45 /**
  46  * The InspIRCd mesh network is maintained by a tree of objects which reference *themselves*.
  47  * Every local server has an array of 32 *serverrecs, known as me[]. Each of these represents
  48  * a local listening port, and is not null if the user has opened a listening port on the server.
  49  * It is assumed nobody will ever want to open more than 32 listening server ports at any one
  50  * time (i mean come on, why would you want more, the ircd works fine with ONE).
  51  * Each me[] entry has multiple classes within it of type ircd_connector. These are stored in a vector
  52  * and each represents a server linked via this socket. If the connection was created outbound,
  53  * the connection is bound to the default ip address by using me[defaultRoute] (defaultRoute being
  54  * a global variable which indicates the default server to make connections on). If the connection
  55  * was created inbound, it is attached to the port the connection came in on. There may be as many
  56  * ircd_connector objects as needed in each me[] entry. Each ircd_connector implements the specifics
  57  * of an ircd connection in the mesh, however each ircd may have multiple ircd_connector connections
  58  * to it, to maintain the mesh link.
  59  */
  60
  61 char* xsumtable = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  62
  63 // creates a random id for a line for detection of duplicate messages
  64 std::string CreateSum()
  65 {
  66         char sum[9];
  67         sum[0] = ':';
  68         sum[8] = '\0';
  69         for(int q = 1; q < 8; q++)
  70                 sum[q] = xsumtable[rand()%52];
  71         return sum;
  72 }
  73
  74 connection::connection()
  75 {
  76         fd = 0;
  77 }
  78
  79
  80 bool connection::CreateListener(char* newhost, int p)
  81 {
  82         sockaddr_in host_address;
  83         int flags;
  84         in_addr addy;
  85         int on = 0;
  86         struct linger linger = { 0 };
  87
  88         this->port = p;
  89
  90         fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  91         if (fd <= 0)
  92         {
  93                 return false;
  94         }
  95
  96         setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,(const char*)&on,sizeof(on));
  97         linger.l_onoff = 1;
  98         linger.l_linger = 1;
  99         setsockopt(fd,SOL_SOCKET,SO_LINGER,(const char*)&linger,sizeof(linger));
 100
 101         // attempt to increase socket sendq and recvq as high as its possible
 102         // to get them on linux.
 103         int sendbuf = 32768;
 104         int recvbuf = 32768;
 105         setsockopt(fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 106         setsockopt(fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 107
 108         memset((void*)&host_address, 0, sizeof(host_address));
 109
 110         host_address.sin_family = AF_INET;
 111
 112         if (!strcmp(newhost,""))
 113         {
 114                 host_address.sin_addr.s_addr = htonl(INADDR_ANY);
 115         }
 116         else
 117         {
 118                 inet_aton(newhost,&addy);
 119                 host_address.sin_addr = addy;
 120         }
 121
 122         host_address.sin_port = htons(p);
 123
 124         if (bind(fd,(sockaddr*)&host_address,sizeof(host_address))<0)
 125         {
 126                 return false;
 127         }
 128
 129         // make the socket non-blocking
 130         flags = fcntl(fd, F_GETFL, 0);
 131         fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 132
 133         this->port = p;
 134
 135         listen(this->fd,5);
 136
 137         return true;
 138 }
 139
 140 char* ircd_connector::GetServerIP()
 141 {
 142         return this->host;
 143 }
 144
 145 int ircd_connector::GetServerPort()
 146 {
 147         return this->port;
 148 }
 149
 150 bool ircd_connector::SetHostAndPort(char* newhost, int newport)
 151 {
 152         strncpy(this->host,newhost,160);
 153         this->port = newport;
 154         return true;
 155 }
 156
 157 bool ircd_connector::SetHostAddress(char* newhost, int newport)
 158 {
 159         strncpy(this->host,newhost,160);
 160         this->port = newport;
 161         memset((void*)&addr, 0, sizeof(addr));
 162         addr.sin_family = AF_INET;
 163         inet_aton(host,&addr.sin_addr);
 164         addr.sin_port = htons(port);
 165         return true;
 166 }
 167
 168 void ircd_connector::SetServerPort(int p)
 169 {
 170         this->port = p;
 171 }
 172
 173 void ircd_connector::AddBuffer(std::string a)
 174 {
 175         std::string b = "";
 176         for (int i = 0; i < a.length(); i++)
 177                 if (a[i] != '\r')
 178                         b = b + a[i];
 179
 180         std::stringstream stream(ircdbuffer);
 181         stream << b;
 182         log(DEBUG,"AddBuffer: %s",b.c_str());
 183         ircdbuffer = stream.str();
 184 }
 185
 186 bool ircd_connector::BufferIsComplete()
 187 {
 188         for (int i = 0; i < ircdbuffer.length(); i++)
 189                 if (ircdbuffer[i] == '\n')
 190                         return true;
 191         return false;
 192 }
 193
 194 void ircd_connector::ClearBuffer()
 195 {
 196         ircdbuffer = "";
 197 }
 198
 199 std::string ircd_connector::GetBuffer()
 200 {
 201         // Fix by Brain 28th Apr 2005
 202         // seems my stringstream code isnt liked by linux
 203         // EVEN THOUGH IT IS CORRECT! Fixed by using a different
 204         // (SLOWER) algorithm...
 205         char* line = (char*)ircdbuffer.c_str();
 206         std::string ret = "";
 207         while ((*line != '\n') && (strlen(line)))
 208         {
 209                 ret = ret + *line;
 210                 line++;
 211         }
 212         if ((*line == '\n') || (*line == '\r'))
 213                 line++;
 214         ircdbuffer = line;
 215         return ret;
 216 }
 217
 218 bool ircd_connector::MakeOutboundConnection(char* newhost, int newport)
 219 {
 220         log(DEBUG,"MakeOutboundConnection: Original param: %s",newhost);
 221         ClearBuffer();
 222         hostent* hoste = gethostbyname(newhost);
 223         if (!hoste)
 224         {
 225                 log(DEBUG,"MakeOutboundConnection: gethostbyname was NULL, setting %s",newhost);
 226                 this->SetHostAddress(newhost,newport);
 227                 SetHostAndPort(newhost,newport);
 228         }
 229         else
 230         {
 231                 struct in_addr* ia = (in_addr*)hoste->h_addr;
 232                 log(DEBUG,"MakeOutboundConnection: gethostbyname was valid, setting %s",inet_ntoa(*ia));
 233                 this->SetHostAddress(inet_ntoa(*ia),newport);
 234                 SetHostAndPort(inet_ntoa(*ia),newport);
 235         }
 236
 237         this->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 238         if (this->fd >= 0)
 239         {
 240                 if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)))
 241                 {
 242                         WriteOpers("connect() failed for %s",host);
 243                         RemoveServer(this->servername.c_str());
 244                         return false;
 245                 }
 246                 int flags = fcntl(this->fd, F_GETFL, 0);
 247                 fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 248                 int sendbuf = 32768;
 249                 int recvbuf = 32768;
 250                 setsockopt(this->fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 251                 setsockopt(this->fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 252                 return true;
 253         }
 254         else
 255         {
 256                 WriteOpers("socket() failed!");
 257                 RemoveServer(this->servername.c_str());
 258         }
 259
 260         return false;
 261 }
 262
 263
 264 bool connection::BeginLink(char* targethost, int newport, char* password, char* servername, int myport)
 265 {
 266         char connect[MAXBUF];
 267
 268         ircd_connector connector;
 269         ircd_connector *cn = this->FindHost(servername);
 270
 271
 272         if (cn)
 273         {
 274                 WriteOpers("CONNECT aborted: Server %s already exists",servername);
 275                 return false;
 276         }
 277
 278
 279         if (this->fd)
 280         {
 281                 if (connector.MakeOutboundConnection(targethost,newport))
 282                 {
 283                         // targethost has been turned into an ip...
 284                         // we dont want this as the server name.
 285                         connector.SetServerName(servername);
 286                         snprintf(connect,MAXBUF,"S %s %s %lu %lu :%s",getservername().c_str(),password,(unsigned long)myport,(unsigned long)GetRevision(),getserverdesc().c_str());
 287                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 288                         connector.SetHostAndPort(targethost, newport);
 289                         this->connectors.push_back(connector);
 290                         return this->SendPacket(connect, servername);
 291                 }
 292                 else
 293                 {
 294                         connector.SetState(STATE_DISCONNECTED);
 295                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 296                 }
 297         }
 298         return false;
 299 }
 300
 301 void ircd_connector::SetVersionString(std::string newversion)
 302 {
 303         log(DEBUG,"Set version of %s to %s",this->servername.c_str(),newversion.c_str());
 304         this->version = newversion;
 305 }
 306
 307 std::string ircd_connector::GetVersionString()
 308 {
 309         return this->version;
 310 }
 311
 312 bool connection::MeshCookie(char* targethost, int newport, unsigned long cookie, char* servername)
 313 {
 314         char connect[MAXBUF];
 315
 316         ircd_connector connector;
 317
 318         WriteOpers("Establishing meshed link to %s:%d",servername,newport);
 319
 320         if (this->fd)
 321         {
 322                 if (connector.MakeOutboundConnection(targethost,newport))
 323                 {
 324                         // targethost has been turned into an ip...
 325                         // we dont want this as the server name.
 326                         connector.SetServerName(servername);
 327                         snprintf(connect,MAXBUF,"- %lu %s :%s",cookie,getservername().c_str(),getserverdesc().c_str());
 328                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 329                         connector.SetHostAndPort(targethost, newport);
 330                         connector.SetState(STATE_CONNECTED);
 331                         this->connectors.push_back(connector);
 332                         return this->SendPacket(connect, servername);
 333                 }
 334                 else
 335                 {
 336                         connector.SetState(STATE_DISCONNECTED);
 337                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 338                 }
 339         }
 340         return false;
 341 }
 342
 343 bool connection::AddIncoming(int newfd, char* targethost, int sourceport)
 344 {
 345         ircd_connector connector;
 346
 347         // targethost has been turned into an ip...
 348         // we dont want this as the server name.
 349         connector.SetServerName(targethost);
 350         connector.SetDescriptor(newfd);
 351         connector.SetState(STATE_NOAUTH_INBOUND);
 352         int flags = fcntl(newfd, F_GETFL, 0);
 353         fcntl(newfd, F_SETFL, flags | O_NONBLOCK);
 354         int sendbuf = 32768;
 355         int recvbuf = 32768;
 356         setsockopt(newfd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 357         setsockopt(newfd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 358         connector.SetHostAndPort(targethost, sourceport);
 359         connector.SetState(STATE_NOAUTH_INBOUND);
 360         log(DEBUG,"connection::AddIncoming() Added connection: %s:%d",targethost,sourceport);
 361         this->connectors.push_back(connector);
 362         return true;
 363 }
 364
 365 void connection::TerminateLink(char* targethost)
 366 {
 367         // this locates the targethost in the connection::connectors vector of the class,
 368         // and terminates it by sending it an SQUIT token and closing its descriptor.
 369         // TerminateLink with a null string causes a terminate of ALL links
 370 }
 371
 372
 373 // Returns a pointer to the connector for 'host'
 374 ircd_connector* connection::FindHost(std::string findhost)
 375 {
 376         for (int i = 0; i < this->connectors.size(); i++)
 377         {
 378                 if (this->connectors[i].GetServerName() == findhost)
 379                 {
 380                         return &this->connectors[i];
 381                 }
 382         }
 383         return NULL;
 384 }
 385
 386 std::string ircd_connector::GetServerName()
 387 {
 388         return this->servername;
 389 }
 390
 391 std::string ircd_connector::GetDescription()
 392 {
 393         return this->description;
 394 }
 395
 396 void ircd_connector::SetServerName(std::string serv)
 397 {
 398         this->servername = serv;
 399 }
 400
 401 void ircd_connector::SetDescription(std::string desc)
 402 {
 403         this->description = desc;
 404 }
 405
 406
 407 int ircd_connector::GetDescriptor()
 408 {
 409         return this->fd;
 410 }
 411
 412 int ircd_connector::GetState()
 413 {
 414         return this->state;
 415 }
 416
 417
 418 void ircd_connector::SetState(int newstate)
 419 {
 420         this->state = newstate;
 421         if (state == STATE_DISCONNECTED)
 422         {
 423                 NetSendMyRoutingTable();
 424         }
 425 }
 426
 427 void ircd_connector::CloseConnection()
 428 {
 429         int flags = fcntl(this->fd, F_GETFL, 0);
 430         fcntl(this->fd, F_SETFL, flags ^ O_NONBLOCK);
 431         close(this->fd);
 432         flags = fcntl(this->fd, F_GETFL, 0);
 433         fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 434 }
 435
 436 void ircd_connector::SetDescriptor(int newfd)
 437 {
 438         this->fd = newfd;
 439 }
 440
 441 bool connection::SendPacket(char *message, const char* sendhost)
 442 {
 443         if ((!message) || (!sendhost))
 444                 return true;
 445
 446         ircd_connector* cn = this->FindHost(sendhost);
 447
 448         if (!strchr(message,'\n'))
 449         {
 450                 strlcat(message,"\n",MAXBUF);
 451         }
 452
 453         if (cn)
 454         {
 455                 log(DEBUG,"main: Connection::SendPacket() sent '%s' to %s",message,cn->GetServerName().c_str());
 456
 457                 if (cn->GetState() == STATE_DISCONNECTED)
 458                 {
 459                         log(DEBUG,"\n\n\n\nMain route to %s is down, seeking alternative\n\n\n\n",sendhost);
 460                         // fix: can only route one hop to avoid a loop
 461                         if (strncmp(message,"R ",2))
 462                         {
 463                                 log(DEBUG,"Not a double reroute");
 464                                 // this route is down, we must re-route the packet through an available point in the mesh.
 465                                 for (int k = 0; k < this->connectors.size(); k++)
 466                                 {
 467                                         log(DEBUG,"Check connector %d: %s",k,this->connectors[k].GetServerName().c_str());
 468                                         // search for another point in the mesh which can 'reach' where we want to go
 469                                         for (int m = 0; m < this->connectors[k].routes.size(); m++)
 470                                         {
 471                                                 log(DEBUG,"Check connector %d: %s route %s",k,this->connectors[k].GetServerName().c_str(),this->connectors[k].routes[m].c_str());
 472                                                 if (!strcasecmp(this->connectors[k].routes[m].c_str(),sendhost))
 473                                                 {
 474                                                         log(DEBUG,"Found alternative route for packet: %s",this->connectors[k].GetServerName().c_str());
 475                                                         char buffer[MAXBUF];
 476                                                         snprintf(buffer,MAXBUF,"R %s %s",sendhost,message);
 477                                                         this->SendPacket(buffer,this->connectors[k].GetServerName().c_str());
 478                                                         return true;
 479                                                 }
 480                                         }
 481                                 }
 482                         }
 483                         char buffer[MAXBUF];
 484                         snprintf(buffer,MAXBUF,"& %s",sendhost);
 485                         NetSendToAllExcept(sendhost,buffer);
 486                         log(DEBUG,"\n\nThere are no routes to %s, we're gonna boot the server off!\n\n",sendhost);
 487                         DoSplit(sendhost);
 488                         return false;
 489                 }
 490
 491                 // returns false if the packet could not be sent (e.g. target host down)
 492                 if (send(cn->GetDescriptor(),message,strlen(message),0)<0)
 493                 {
 494                         log(DEBUG,"send() failed for Connection::SendPacket(): %s",strerror(errno));
 495                         log(DEBUG,"Disabling connector: %s",cn->GetServerName().c_str());
 496                         cn->CloseConnection();
 497                         cn->SetState(STATE_DISCONNECTED);
 498                         // retry the packet along a new route so either arrival OR failure are gauranteed (bugfix)
 499                         return this->SendPacket(message,sendhost);
 500                 }
 501                 return true;
 502         }
 503 }
 504
 505 bool already_have_sum(std::string sum)
 506 {
 507         for (int i = 0; i < xsums.size(); i++)
 508         {
 509                 if (xsums[i] == sum)
 510                 {
 511                         return true;
 512                 }
 513         }
 514         if (xsums.size() >= 128)
 515         {
 516                 xsums.pop_front();
 517         }
 518         xsums.push_back(sum);
 519         return false;
 520 }
 521
 522 // receives a packet from any where there is data waiting, first come, first served
 523 // fills the message and host values with the host where the data came from.
 524
 525 bool connection::RecvPacket(std::deque<std::string> &messages, char* recvhost,std::deque<std::string> &sums)
 526 {
 527         char data[65536];
 528         memset(data, 0, 65536);
 529         for (int i = 0; i < this->connectors.size(); i++)
 530         {
 531                 if (this->connectors[i].GetState() != STATE_DISCONNECTED)
 532                 {
 533                         // returns false if the packet could not be sent (e.g. target host down)
 534                         int rcvsize = 0;
 535
 536                         // check if theres any data on this socket
 537                         // if not, continue onwards to the next.
 538                         pollfd polls;
 539                         polls.fd = this->connectors[i].GetDescriptor();
 540                         polls.events = POLLIN;
 541                         int ret = poll(&polls,1,1);
 542                         if (ret <= 0) continue;
 543
 544                         rcvsize = recv(this->connectors[i].GetDescriptor(),data,65000,0);
 545                         data[rcvsize] = '\0';
 546                         if (rcvsize == -1)
 547                         {
 548                                 if (errno != EAGAIN)
 549                                 {
 550                                         log(DEBUG,"recv() failed for Connection::RecvPacket(): %s",strerror(errno));
 551                                         log(DEBUG,"Disabling connector: %s",this->connectors[i].GetServerName().c_str());
 552                                         this->connectors[i].CloseConnection();
 553                                         this->connectors[i].SetState(STATE_DISCONNECTED);
 554                                 }
 555                         }
 556                         int pushed = 0;
 557                         if (rcvsize > 0)
 558                         {
 559                                 this->connectors[i].AddBuffer(data);
 560                                 if (this->connectors[i].BufferIsComplete())
 561                                 {
 562                                         while (this->connectors[i].BufferIsComplete())
 563                                         {
 564                                                 std::string text = this->connectors[i].GetBuffer();
 565                                                 if (text != "")
 566                                                 {
 567                                                         if ((text[0] == ':') && (text.find(" ") != std::string::npos))
 568                                                         {
 569                                                                 std::string orig = text;
 570                                                                 log(DEBUG,"Original: %s",text.c_str());
 571                                                                 std::string sum = text.substr(1,text.find(" ")-1);
 572                                                                 text = text.substr(text.find(" ")+1,text.length());
 573                                                                 std::string possible_token = text.substr(1,text.find(" ")-1);
 574                                                                 if (possible_token.length() > 1)
 575                                                                 {
 576                                                                         sums.push_back("*");
 577                                                                         text = orig;
 578                                                                         log(DEBUG,"Non-mesh, non-tokenized string passed up the chain");
 579                                                                 }
 580                                                                 else
 581                                                                 {
 582                                                                         log(DEBUG,"Packet sum: '%s'",sum.c_str());
 583                                                                         if ((already_have_sum(sum)) && (sum != "*"))
 584                                                                         {
 585                                                                                 // we don't accept dupes
 586                                                                                 log(DEBUG,"Duplicate packet sum %s from server %s dropped",sum.c_str(),this->connectors[i].GetServerName().c_str());
 587                                                                                 continue;
 588                                                                         }
 589                                                                         sums.push_back(sum.c_str());
 590                                                                 }
 591                                                         }
 592                                                         else sums.push_back("*");
 593                                                         messages.push_back(text.c_str());
 594                                                         strlcpy(recvhost,this->connectors[i].GetServerName().c_str(),160);
 595                                                         log(DEBUG,"Connection::RecvPacket() %d:%s->%s",pushed++,recvhost,text.c_str());
 596                                                 }
 597                                         }
 598                                         return true;
 599                                 }
 600                         }
 601                 }
 602         }
 603         // nothing new yet -- message and host will be undefined
 604         return false;
 605 }
 606