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         char* line = (char*)ircdbuffer.c_str();
 170         char ret[MAXBUF];
 171         std::stringstream* stream = new std::stringstream(std::stringstream::in | std::stringstream::out);
 172         *stream << ircdbuffer;
 173         stream->getline(ret,MAXBUF);
 174         while ((*line != '\n') && (strlen(line)))
 175                 line++;
 176         if ((*line == '\n') || (*line == '\r'))
 177                 line++;
 178         ircdbuffer = line;
 179         delete stream;
 180         return ret;
 181 }
 182
 183 bool ircd_connector::MakeOutboundConnection(char* newhost, int newport)
 184 {
 185         log(DEBUG,"MakeOutboundConnection: Original param: %s",newhost);
 186         ClearBuffer();
 187         hostent* hoste = gethostbyname(newhost);
 188         if (!hoste)
 189         {
 190                 log(DEBUG,"MakeOutboundConnection: gethostbyname was NULL, setting %s",newhost);
 191                 this->SetHostAddress(newhost,newport);
 192                 SetHostAndPort(newhost,newport);
 193         }
 194         else
 195         {
 196                 struct in_addr* ia = (in_addr*)hoste->h_addr;
 197                 log(DEBUG,"MakeOutboundConnection: gethostbyname was valid, setting %s",inet_ntoa(*ia));
 198                 this->SetHostAddress(inet_ntoa(*ia),newport);
 199                 SetHostAndPort(inet_ntoa(*ia),newport);
 200         }
 201
 202         this->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 203         if (this->fd >= 0)
 204         {
 205                 if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)))
 206                 {
 207                         WriteOpers("connect() failed for %s",host);
 208                         RemoveServer(this->servername.c_str());
 209                         return false;
 210                 }
 211                 int flags = fcntl(this->fd, F_GETFL, 0);
 212                 fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 213                 int sendbuf = 32768;
 214                 int recvbuf = 32768;
 215                 setsockopt(this->fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 216                 setsockopt(this->fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 217                 return true;
 218         }
 219         else
 220         {
 221                 WriteOpers("socket() failed!");
 222                 RemoveServer(this->servername.c_str());
 223         }
 224
 225         return false;
 226 }
 227
 228
 229 bool connection::BeginLink(char* targethost, int newport, char* password, char* servername, int myport)
 230 {
 231         char connect[MAXBUF];
 232
 233         ircd_connector connector;
 234         ircd_connector *cn = this->FindHost(servername);
 235
 236
 237         if (cn)
 238         {
 239                 WriteOpers("CONNECT aborted: Server %s already exists",servername);
 240                 return false;
 241         }
 242
 243
 244         if (this->fd)
 245         {
 246                 if (connector.MakeOutboundConnection(targethost,newport))
 247                 {
 248                         // targethost has been turned into an ip...
 249                         // we dont want this as the server name.
 250                         connector.SetServerName(servername);
 251                         snprintf(connect,MAXBUF,"S %s %s %lu %lu :%s",getservername().c_str(),password,(unsigned long)myport,(unsigned long)GetRevision(),getserverdesc().c_str());
 252                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 253                         connector.SetHostAndPort(targethost, newport);
 254                         this->connectors.push_back(connector);
 255                         return this->SendPacket(connect, servername);
 256                 }
 257                 else
 258                 {
 259                         connector.SetState(STATE_DISCONNECTED);
 260                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 261                 }
 262         }
 263         return false;
 264 }
 265
 266 bool connection::MeshCookie(char* targethost, int newport, unsigned long cookie, char* servername)
 267 {
 268         char connect[MAXBUF];
 269
 270         ircd_connector connector;
 271
 272         WriteOpers("Establishing meshed link to %s:%d",servername,newport);
 273
 274         if (this->fd)
 275         {
 276                 if (connector.MakeOutboundConnection(targethost,newport))
 277                 {
 278                         // targethost has been turned into an ip...
 279                         // we dont want this as the server name.
 280                         connector.SetServerName(servername);
 281                         snprintf(connect,MAXBUF,"- %lu %s :%s",cookie,getservername().c_str(),getserverdesc().c_str());
 282                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 283                         connector.SetHostAndPort(targethost, newport);
 284                         connector.SetState(STATE_CONNECTED);
 285                         this->connectors.push_back(connector);
 286                         return this->SendPacket(connect, servername);
 287                 }
 288                 else
 289                 {
 290                         connector.SetState(STATE_DISCONNECTED);
 291                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 292                 }
 293         }
 294         return false;
 295 }
 296
 297 bool connection::AddIncoming(int newfd, char* targethost, int sourceport)
 298 {
 299         ircd_connector connector;
 300
 301         // targethost has been turned into an ip...
 302         // we dont want this as the server name.
 303         connector.SetServerName(targethost);
 304         connector.SetDescriptor(newfd);
 305         connector.SetState(STATE_NOAUTH_INBOUND);
 306         int flags = fcntl(newfd, F_GETFL, 0);
 307         fcntl(newfd, F_SETFL, flags | O_NONBLOCK);
 308         int sendbuf = 32768;
 309         int recvbuf = 32768;
 310         setsockopt(newfd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 311         setsockopt(newfd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 312         connector.SetHostAndPort(targethost, sourceport);
 313         connector.SetState(STATE_NOAUTH_INBOUND);
 314         log(DEBUG,"connection::AddIncoming() Added connection: %s:%d",targethost,sourceport);
 315         this->connectors.push_back(connector);
 316         return true;
 317 }
 318
 319 void connection::TerminateLink(char* targethost)
 320 {
 321         // this locates the targethost in the connection::connectors vector of the class,
 322         // and terminates it by sending it an SQUIT token and closing its descriptor.
 323         // TerminateLink with a null string causes a terminate of ALL links
 324 }
 325
 326
 327 // Returns a pointer to the connector for 'host'
 328 ircd_connector* connection::FindHost(std::string findhost)
 329 {
 330         for (int i = 0; i < this->connectors.size(); i++)
 331         {
 332                 if (this->connectors[i].GetServerName() == findhost)
 333                 {
 334                         return &this->connectors[i];
 335                 }
 336         }
 337         return NULL;
 338 }
 339
 340 std::string ircd_connector::GetServerName()
 341 {
 342         return this->servername;
 343 }
 344
 345 std::string ircd_connector::GetDescription()
 346 {
 347         return this->description;
 348 }
 349
 350 void ircd_connector::SetServerName(std::string serv)
 351 {
 352         this->servername = serv;
 353 }
 354
 355 void ircd_connector::SetDescription(std::string desc)
 356 {
 357         this->description = desc;
 358 }
 359
 360
 361 int ircd_connector::GetDescriptor()
 362 {
 363         return this->fd;
 364 }
 365
 366 int ircd_connector::GetState()
 367 {
 368         return this->state;
 369 }
 370
 371
 372 void ircd_connector::SetState(int newstate)
 373 {
 374         this->state = newstate;
 375         if (state == STATE_DISCONNECTED)
 376         {
 377                 NetSendMyRoutingTable();
 378         }
 379 }
 380
 381 void ircd_connector::CloseConnection()
 382 {
 383         int flags = fcntl(this->fd, F_GETFL, 0);
 384         fcntl(this->fd, F_SETFL, flags ^ O_NONBLOCK);
 385         close(this->fd);
 386         flags = fcntl(this->fd, F_GETFL, 0);
 387         fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 388 }
 389
 390 void ircd_connector::SetDescriptor(int newfd)
 391 {
 392         this->fd = newfd;
 393 }
 394
 395 bool connection::SendPacket(char *message, const char* sendhost)
 396 {
 397         if ((!message) || (!sendhost))
 398                 return true;
 399
 400         ircd_connector* cn = this->FindHost(sendhost);
 401
 402         if (!strchr(message,'\n'))
 403         {
 404                 strlcat(message,"\n",MAXBUF);
 405         }
 406
 407         if (cn)
 408         {
 409                 log(DEBUG,"main: Connection::SendPacket() sent '%s' to %s",message,cn->GetServerName().c_str());
 410
 411                 if (cn->GetState() == STATE_DISCONNECTED)
 412                 {
 413                         log(DEBUG,"Main route to %s is down, seeking alternative",sendhost);
 414                         // fix: can only route one hop to avoid a loop
 415                         if (strncmp(message,"R ",2))
 416                         {
 417                                 // this route is down, we must re-route the packet through an available point in the mesh.
 418                                 for (int k = 0; k < this->connectors.size(); k++)
 419                                 {
 420                                         // search for another point in the mesh which can 'reach' where we want to go
 421                                         for (int m = 0; m < this->connectors[k].routes.size(); m++)
 422                                         {
 423                                                 if (!strcasecmp(this->connectors[k].routes[m].c_str(),sendhost))
 424                                                 {
 425                                                         log(DEBUG,"Found alternative route for packet: %s",this->connectors[k].GetServerName().c_str());
 426                                                         char buffer[MAXBUF];
 427                                                         snprintf(buffer,MAXBUF,"R %s %s",sendhost,message);
 428                                                         this->SendPacket(buffer,this->connectors[k].GetServerName().c_str());
 429                                                         return true;
 430                                                 }
 431                                         }
 432                                 }
 433                         }
 434                         char buffer[MAXBUF];
 435                         snprintf(buffer,MAXBUF,"& %s",sendhost);
 436                         NetSendToAllExcept(sendhost,buffer);
 437                         log(DEBUG,"There are no routes to %s, we're gonna boot the server off!",sendhost);
 438                         DoSplit(sendhost);
 439                         return false;
 440                 }
 441
 442                 // returns false if the packet could not be sent (e.g. target host down)
 443                 if (send(cn->GetDescriptor(),message,strlen(message),0)<0)
 444                 {
 445                         log(DEBUG,"send() failed for Connection::SendPacket(): %s",strerror(errno));
 446                         log(DEBUG,"Disabling connector: %s",cn->GetServerName().c_str());
 447                         cn->CloseConnection();
 448                         cn->SetState(STATE_DISCONNECTED);
 449                         // retry the packet along a new route so either arrival OR failure are gauranteed (bugfix)
 450                         return this->SendPacket(message,sendhost);
 451                 }
 452                 return true;
 453         }
 454 }
 455
 456 // receives a packet from any where there is data waiting, first come, first served
 457 // fills the message and host values with the host where the data came from.
 458
 459 bool connection::RecvPacket(std::deque<std::string> &messages, char* recvhost)
 460 {
 461         char data[4096];
 462         memset(data, 0, 4096);
 463         for (int i = 0; i < this->connectors.size(); i++)
 464         {
 465                 if (this->connectors[i].GetState() != STATE_DISCONNECTED)
 466                 {
 467                         // returns false if the packet could not be sent (e.g. target host down)
 468                         int rcvsize = 0;
 469                         rcvsize = recv(this->connectors[i].GetDescriptor(),data,4096,0);
 470                         data[rcvsize] = '\0';
 471                         if (rcvsize == -1)
 472                         {
 473                                 if (errno != EAGAIN)
 474                                 {
 475                                         log(DEBUG,"recv() failed for Connection::RecvPacket(): %s",strerror(errno));
 476                                         log(DEBUG,"Disabling connector: %s",this->connectors[i].GetServerName().c_str());
 477                                         this->connectors[i].CloseConnection();
 478                                         this->connectors[i].SetState(STATE_DISCONNECTED);
 479                                 }
 480                         }
 481                         int pushed = 0;
 482                         if (rcvsize > 0)
 483                         {
 484                                 this->connectors[i].AddBuffer(data);
 485                                 if (this->connectors[i].BufferIsComplete())
 486                                 {
 487                                         while (this->connectors[i].BufferIsComplete())
 488                                         {
 489                                                 std::string text = this->connectors[i].GetBuffer();
 490                                                 messages.push_back(text.c_str());
 491                                                 strlcpy(recvhost,this->connectors[i].GetServerName().c_str(),160);
 492                                                 log(DEBUG,"main: Connection::RecvPacket() %d:%s->%s",pushed++,recvhost,text.c_str());
 493                                         }
 494                                         return true;
 495                                 }
 496                         }
 497                 }
 498         }
 499         // nothing new yet -- message and host will be undefined
 500         return false;
 501 }
 502
 503 long connection::GenKey()
 504 {
 505         return (random()*time(NULL));
 506 }
 507