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         ircdbuffer = stream.str();
 151 }
 152
 153 bool ircd_connector::BufferIsComplete()
 154 {
 155         for (int i = 0; i < ircdbuffer.length(); i++)
 156                 if (ircdbuffer[i] == '\n')
 157                         return true;
 158         return false;
 159 }
 160
 161 void ircd_connector::ClearBuffer()
 162 {
 163         ircdbuffer = "";
 164 }
 165
 166 std::string ircd_connector::GetBuffer()
 167 {
 168         char* line = (char*)ircdbuffer.c_str();
 169         char ret[MAXBUF];
 170         std::stringstream* stream = new std::stringstream(std::stringstream::in | std::stringstream::out);
 171         *stream << ircdbuffer;
 172         stream->getline(ret,MAXBUF);
 173         while ((*line != '\n') && (strlen(line)))
 174                 line++;
 175         if ((*line == '\n') || (*line == '\r'))
 176                 line++;
 177         ircdbuffer = line;
 178         delete stream;
 179         return ret;
 180 }
 181
 182 bool ircd_connector::MakeOutboundConnection(char* newhost, int newport)
 183 {
 184         log(DEBUG,"MakeOutboundConnection: Original param: %s",newhost);
 185         ClearBuffer();
 186         hostent* hoste = gethostbyname(newhost);
 187         if (!hoste)
 188         {
 189                 log(DEBUG,"MakeOutboundConnection: gethostbyname was NULL, setting %s",newhost);
 190                 this->SetHostAddress(newhost,newport);
 191                 SetHostAndPort(newhost,newport);
 192         }
 193         else
 194         {
 195                 struct in_addr* ia = (in_addr*)hoste->h_addr;
 196                 log(DEBUG,"MakeOutboundConnection: gethostbyname was valid, setting %s",inet_ntoa(*ia));
 197                 this->SetHostAddress(inet_ntoa(*ia),newport);
 198                 SetHostAndPort(inet_ntoa(*ia),newport);
 199         }
 200
 201         this->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 202         if (this->fd >= 0)
 203         {
 204                 if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)))
 205                 {
 206                         WriteOpers("connect() failed for %s",host);
 207                         RemoveServer(this->servername.c_str());
 208                         return false;
 209                 }
 210                 int flags = fcntl(this->fd, F_GETFL, 0);
 211                 fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 212                 int sendbuf = 32768;
 213                 int recvbuf = 32768;
 214                 setsockopt(this->fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 215                 setsockopt(this->fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 216                 return true;
 217         }
 218         else
 219         {
 220                 WriteOpers("socket() failed!");
 221                 RemoveServer(this->servername.c_str());
 222         }
 223
 224         return false;
 225 }
 226
 227
 228 bool connection::BeginLink(char* targethost, int newport, char* password, char* servername, int myport)
 229 {
 230         char connect[MAXBUF];
 231
 232         ircd_connector connector;
 233         ircd_connector *cn = this->FindHost(servername);
 234
 235
 236         if (cn)
 237         {
 238                 WriteOpers("CONNECT aborted: Server %s already exists",servername);
 239                 return false;
 240         }
 241
 242
 243         if (this->fd)
 244         {
 245                 if (connector.MakeOutboundConnection(targethost,newport))
 246                 {
 247                         // targethost has been turned into an ip...
 248                         // we dont want this as the server name.
 249                         connector.SetServerName(servername);
 250                         snprintf(connect,MAXBUF,"S %s %s %lu %lu :%s",getservername().c_str(),password,(unsigned long)myport,(unsigned long)GetRevision(),getserverdesc().c_str());
 251                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 252                         connector.SetHostAndPort(targethost, newport);
 253                         this->connectors.push_back(connector);
 254                         return this->SendPacket(connect, servername);
 255                 }
 256                 else
 257                 {
 258                         connector.SetState(STATE_DISCONNECTED);
 259                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 260                 }
 261         }
 262         return false;
 263 }
 264
 265 bool connection::MeshCookie(char* targethost, int newport, unsigned long cookie, char* servername)
 266 {
 267         char connect[MAXBUF];
 268
 269         ircd_connector connector;
 270
 271         WriteOpers("Establishing meshed link to %s:%d",servername,newport);
 272
 273         if (this->fd)
 274         {
 275                 if (connector.MakeOutboundConnection(targethost,newport))
 276                 {
 277                         // targethost has been turned into an ip...
 278                         // we dont want this as the server name.
 279                         connector.SetServerName(servername);
 280                         snprintf(connect,MAXBUF,"- %lu %s :%s",cookie,getservername().c_str(),getserverdesc().c_str());
 281                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 282                         connector.SetHostAndPort(targethost, newport);
 283                         connector.SetState(STATE_CONNECTED);
 284                         this->connectors.push_back(connector);
 285                         return this->SendPacket(connect, servername);
 286                 }
 287                 else
 288                 {
 289                         connector.SetState(STATE_DISCONNECTED);
 290                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 291                 }
 292         }
 293         return false;
 294 }
 295
 296 bool connection::AddIncoming(int newfd, char* targethost, int sourceport)
 297 {
 298         ircd_connector connector;
 299
 300         // targethost has been turned into an ip...
 301         // we dont want this as the server name.
 302         connector.SetServerName(targethost);
 303         connector.SetDescriptor(newfd);
 304         connector.SetState(STATE_NOAUTH_INBOUND);
 305         int flags = fcntl(newfd, F_GETFL, 0);
 306         fcntl(newfd, F_SETFL, flags | O_NONBLOCK);
 307         int sendbuf = 32768;
 308         int recvbuf = 32768;
 309         setsockopt(newfd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 310         setsockopt(newfd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 311         connector.SetHostAndPort(targethost, sourceport);
 312         connector.SetState(STATE_NOAUTH_INBOUND);
 313         log(DEBUG,"connection::AddIncoming() Added connection: %s:%d",targethost,sourceport);
 314         this->connectors.push_back(connector);
 315         return true;
 316 }
 317
 318 void connection::TerminateLink(char* targethost)
 319 {
 320         // this locates the targethost in the connection::connectors vector of the class,
 321         // and terminates it by sending it an SQUIT token and closing its descriptor.
 322         // TerminateLink with a null string causes a terminate of ALL links
 323 }
 324
 325
 326 // Returns a pointer to the connector for 'host'
 327 ircd_connector* connection::FindHost(std::string findhost)
 328 {
 329         for (int i = 0; i < this->connectors.size(); i++)
 330         {
 331                 if (this->connectors[i].GetServerName() == findhost)
 332                 {
 333                         return &this->connectors[i];
 334                 }
 335         }
 336         return NULL;
 337 }
 338
 339 std::string ircd_connector::GetServerName()
 340 {
 341         return this->servername;
 342 }
 343
 344 std::string ircd_connector::GetDescription()
 345 {
 346         return this->description;
 347 }
 348
 349 void ircd_connector::SetServerName(std::string serv)
 350 {
 351         this->servername = serv;
 352 }
 353
 354 void ircd_connector::SetDescription(std::string desc)
 355 {
 356         this->description = desc;
 357 }
 358
 359
 360 int ircd_connector::GetDescriptor()
 361 {
 362         return this->fd;
 363 }
 364
 365 int ircd_connector::GetState()
 366 {
 367         return this->state;
 368 }
 369
 370
 371 void ircd_connector::SetState(int newstate)
 372 {
 373         this->state = newstate;
 374         if (state == STATE_DISCONNECTED)
 375         {
 376                 NetSendMyRoutingTable();
 377         }
 378 }
 379
 380 void ircd_connector::CloseConnection()
 381 {
 382         int flags = fcntl(this->fd, F_GETFL, 0);
 383         fcntl(this->fd, F_SETFL, flags ^ O_NONBLOCK);
 384         close(this->fd);
 385         flags = fcntl(this->fd, F_GETFL, 0);
 386         fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 387 }
 388
 389 void ircd_connector::SetDescriptor(int newfd)
 390 {
 391         this->fd = newfd;
 392 }
 393
 394 bool connection::SendPacket(char *message, const char* sendhost)
 395 {
 396         if ((!message) || (!sendhost))
 397                 return true;
 398
 399         ircd_connector* cn = this->FindHost(sendhost);
 400
 401         if (!strchr(message,'\n'))
 402         {
 403                 strlcat(message,"\n",MAXBUF);
 404         }
 405
 406         if (cn)
 407         {
 408                 log(DEBUG,"main: Connection::SendPacket() sent '%s' to %s",message,cn->GetServerName().c_str());
 409
 410                 if (cn->GetState() == STATE_DISCONNECTED)
 411                 {
 412                         log(DEBUG,"Main route to %s is down, seeking alternative",host);
 413                         // fix: can only route one hop to avoid a loop
 414                         if (!strncmp(message,"R ",2))
 415                         {
 416                                 // this route is down, we must re-route the packet through an available point in the mesh.
 417                                 for (int k = 0; k < this->connectors.size(); k++)
 418                                 {
 419                                         // search for another point in the mesh which can 'reach' where we want to go
 420                                         for (int m = 0; m < this->connectors[k].routes.size(); m++)
 421                                         {
 422                                                 if (!strcasecmp(this->connectors[k].routes[m].c_str(),sendhost))
 423                                                 {
 424                                                         log(DEBUG,"Found alternative route for packet: %s",this->connectors[k].GetServerName().c_str());
 425                                                         char buffer[MAXBUF];
 426                                                         snprintf(buffer,MAXBUF,"R %s %s",sendhost,message);
 427                                                         this->SendPacket(buffer,this->connectors[k].GetServerName().c_str());
 428                                                         return true;
 429                                                 }
 430                                         }
 431                                 }
 432                         }
 433                         char buffer[MAXBUF];
 434                         snprintf(buffer,MAXBUF,"& %s",sendhost);
 435                         NetSendToAllExcept(sendhost,buffer);
 436                         log(DEBUG,"There are no routes to %s, we're gonna boot the server off!",sendhost);
 437                         DoSplit(sendhost);
 438                         return false;
 439                 }
 440
 441                 // returns false if the packet could not be sent (e.g. target host down)
 442                 if (send(cn->GetDescriptor(),message,strlen(message),0)<0)
 443                 {
 444                         log(DEBUG,"send() failed for Connection::SendPacket(): %s",strerror(errno));
 445                         log(DEBUG,"Disabling connector: %s",cn->GetServerName().c_str());
 446                         cn->CloseConnection();
 447                         cn->SetState(STATE_DISCONNECTED);
 448                         // retry the packet along a new route so either arrival OR failure are gauranteed (bugfix)
 449                         return this->SendPacket(message,sendhost);
 450                 }
 451                 return true;
 452         }
 453 }
 454
 455 // receives a packet from any where there is data waiting, first come, first served
 456 // fills the message and host values with the host where the data came from.
 457
 458 bool connection::RecvPacket(std::deque<std::string> &messages, char* recvhost)
 459 {
 460         char data[4096];
 461         memset(data, 0, 4096);
 462         for (int i = 0; i < this->connectors.size(); i++)
 463         {
 464                 if (this->connectors[i].GetState() != STATE_DISCONNECTED)
 465                 {
 466                         // returns false if the packet could not be sent (e.g. target host down)
 467                         int rcvsize = 0;
 468                         rcvsize = recv(this->connectors[i].GetDescriptor(),data,4096,0);
 469                         data[rcvsize] = '\0';
 470                         if (rcvsize == -1)
 471                         {
 472                                 if (errno != EAGAIN)
 473                                 {
 474                                         log(DEBUG,"recv() failed for Connection::RecvPacket(): %s",strerror(errno));
 475                                         log(DEBUG,"Disabling connector: %s",this->connectors[i].GetServerName().c_str());
 476                                         this->connectors[i].CloseConnection();
 477                                         this->connectors[i].SetState(STATE_DISCONNECTED);
 478                                 }
 479                         }
 480                         int pushed = 0;
 481                         if (rcvsize > 0)
 482                         {
 483                                 this->connectors[i].AddBuffer(data);
 484                                 if (this->connectors[i].BufferIsComplete())
 485                                 {
 486                                         while (this->connectors[i].BufferIsComplete())
 487                                         {
 488                                                 std::string text = this->connectors[i].GetBuffer();
 489                                                 messages.push_back(text.c_str());
 490                                                 strlcpy(recvhost,this->connectors[i].GetServerName().c_str(),160);
 491                                                 log(DEBUG,"main: Connection::RecvPacket() %d:%s->%s",pushed++,recvhost,text.c_str());
 492                                         }
 493                                         return true;
 494                                 }
 495                         }
 496                 }
 497         }
 498         // nothing new yet -- message and host will be undefined
 499         return false;
 500 }
 501
 502 long connection::GenKey()
 503 {
 504         return (random()*time(NULL));
 505 }
 506