src/servers.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 using namespace std;
  18
  19 #include "inspircd_config.h"
  20 #include "servers.h"
  21 #include "inspircd.h"
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <poll.h>
  25 #include <sys/errno.h>
  26 #include <sys/ioctl.h>
  27 #include <sys/utsname.h>
  28 #include <vector>
  29 #include <string>
  30 #include <deque>
  31 #include <sstream>
  32 #include <map>
  33 #include "inspstring.h"
  34 #include "helperfuncs.h"
  35 #include "connection.h"
  36
  37 extern time_t TIME;
  38 extern int MaxConn;
  39
  40 extern serverrec* me[32];
  41
  42 extern bool has_been_netsplit;
  43
  44 std::deque<std::string> xsums;
  45
  46 serverrec::serverrec()
  47 {
  48         strlcpy(name,"",256);
  49         pingtime = 0;
  50         lastping = TIME;
  51         usercount_i = usercount = opercount = version = 0;
  52         hops_away = 1;
  53         signon = TIME;
  54         jupiter = false;
  55         fd = 0;
  56         sync_soon = false;
  57         strlcpy(nickserv,"",NICKMAX);
  58         connectors.clear();
  59 }
  60
  61
  62 serverrec::~serverrec()
  63 {
  64 }
  65
  66 serverrec::serverrec(char* n, long ver, bool jupe)
  67 {
  68         strlcpy(name,n,256);
  69         lastping = TIME;
  70         usercount_i = usercount = opercount = 0;
  71         version = ver;
  72         hops_away = 1;
  73         signon = TIME;
  74         jupiter = jupe;
  75         fd = 0;
  76         sync_soon = false;
  77         strlcpy(nickserv,"",NICKMAX);
  78         connectors.clear();
  79 }
  80
  81 bool serverrec::CreateListener(char* newhost, int p)
  82 {
  83         sockaddr_in host_address;
  84         int flags;
  85         in_addr addy;
  86         int on = 0;
  87         struct linger linger = { 0 };
  88
  89         this->port = p;
  90
  91         fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  92         if (fd <= 0)
  93         {
  94                 return false;
  95         }
  96
  97         setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,(const char*)&on,sizeof(on));
  98         linger.l_onoff = 1;
  99         linger.l_linger = 1;
 100         setsockopt(fd,SOL_SOCKET,SO_LINGER,(const char*)&linger,sizeof(linger));
 101
 102         // attempt to increase socket sendq and recvq as high as its possible
 103         // to get them on linux.
 104         int sendbuf = 32768;
 105         int recvbuf = 32768;
 106         setsockopt(fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 107         setsockopt(fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 108
 109         memset((void*)&host_address, 0, sizeof(host_address));
 110
 111         host_address.sin_family = AF_INET;
 112
 113         if (!strcmp(newhost,""))
 114         {
 115                 host_address.sin_addr.s_addr = htonl(INADDR_ANY);
 116         }
 117         else
 118         {
 119                 inet_aton(newhost,&addy);
 120                 host_address.sin_addr = addy;
 121         }
 122
 123         host_address.sin_port = htons(p);
 124
 125         if (bind(fd,(sockaddr*)&host_address,sizeof(host_address))<0)
 126         {
 127                 return false;
 128         }
 129
 130         // make the socket non-blocking
 131         flags = fcntl(fd, F_GETFL, 0);
 132         fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 133
 134         this->port = p;
 135
 136         listen(this->fd, MaxConn);
 137
 138         return true;
 139 }
 140
 141
 142 bool serverrec::BeginLink(char* targethost, int newport, char* password, char* servername, int myport)
 143 {
 144         char connect[MAXBUF];
 145
 146         ircd_connector connector;
 147         ircd_connector *cn = this->FindHost(servername);
 148
 149
 150         if (cn)
 151         {
 152                 WriteOpers("CONNECT aborted: Server %s already exists",servername);
 153                 return false;
 154         }
 155
 156
 157         if (this->fd)
 158         {
 159                 if (connector.MakeOutboundConnection(targethost,newport))
 160                 {
 161                         // targethost has been turned into an ip...
 162                         // we dont want this as the server name.
 163                         connector.SetServerName(servername);
 164                         snprintf(connect,MAXBUF,"S %s %s %lu %s :%s",getservername().c_str(),password,(unsigned long)myport,GetRevision().c_str(),getserverdesc().c_str());
 165                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 166                         connector.SetHostAndPort(targethost, newport);
 167                         this->connectors.push_back(connector);
 168                         // this packet isn't actually sent until the socket connects -- the STATE_NOAUTH_OUTBOUND state
 169                         // queues outbound data until the socket is polled as writeable (e.g. the connection is established)
 170                         return this->SendPacket(connect, servername);
 171                 }
 172                 else
 173                 {
 174                         connector.SetState(STATE_DISCONNECTED);
 175                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 176                 }
 177         }
 178         return false;
 179 }
 180
 181
 182 bool serverrec::MeshCookie(char* targethost, int newport, unsigned long cookie, char* servername)
 183 {
 184         char connect[MAXBUF];
 185
 186         ircd_connector connector;
 187
 188         WriteOpers("Establishing meshed link to %s:%d",servername,newport);
 189
 190         if (this->fd)
 191         {
 192                 if (connector.MakeOutboundConnection(targethost,newport))
 193                 {
 194                         // targethost has been turned into an ip...
 195                         // we dont want this as the server name.
 196                         connector.SetServerName(servername);
 197                         snprintf(connect,MAXBUF,"- %lu %s :%s",cookie,getservername().c_str(),getserverdesc().c_str());
 198                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 199                         connector.SetHostAndPort(targethost, newport);
 200                         this->connectors.push_back(connector);
 201                         return this->SendPacket(connect, servername);
 202                 }
 203                 else
 204                 {
 205                         connector.SetState(STATE_DISCONNECTED);
 206                         WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
 207                 }
 208         }
 209         return false;
 210 }
 211
 212 bool serverrec::AddIncoming(int newfd, char* targethost, int sourceport)
 213 {
 214         ircd_connector connector;
 215
 216         // targethost has been turned into an ip...
 217         // we dont want this as the server name.
 218         connector.SetServerName(targethost);
 219         connector.SetDescriptor(newfd);
 220         connector.SetState(STATE_NOAUTH_INBOUND);
 221         int flags = fcntl(newfd, F_GETFL, 0);
 222         fcntl(newfd, F_SETFL, flags | O_NONBLOCK);
 223         int sendbuf = 32768;
 224         int recvbuf = 32768;
 225         setsockopt(newfd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 226         setsockopt(newfd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 227         connector.SetHostAndPort(targethost, sourceport);
 228         connector.SetState(STATE_NOAUTH_INBOUND);
 229         log(DEBUG,"serverrec::AddIncoming() Added connection: %s:%d",targethost,sourceport);
 230         this->connectors.push_back(connector);
 231         return true;
 232 }
 233
 234 void serverrec::TerminateLink(char* targethost)
 235 {
 236         // this locates the targethost in the serverrec::connectors vector of the class,
 237        // and terminates it by sending it an SQUIT token and closing its descriptor.
 238         // TerminateLink with a null string causes a terminate of ALL links
 239 }
 240
 241 // Returns a pointer to the connector for 'host'
 242 ircd_connector* serverrec::FindHost(std::string findhost)
 243 {
 244         for (int i = 0; i < this->connectors.size(); i++)
 245         {
 246                 if (this->connectors[i].GetServerName() == findhost)
 247                 {
 248                         return &this->connectors[i];
 249                 }
 250         }
 251         return NULL;
 252 }
 253
 254
 255 // Checks to see if we can still reach a server at all (e.g. is it in ANY routing table?)
 256 bool IsRoutable(std::string servername)
 257 {
 258         for (int x = 0; x < 32; x++) if (me[x])
 259         {
 260                 ircd_connector* cn = me[x]->FindHost(servername.c_str());
 261                 if (cn)
 262                 {
 263                         if (cn->GetState() == STATE_DISCONNECTED)
 264                         {
 265                                 for (int k = 0; k < me[x]->connectors.size(); k++)
 266                                 {
 267                                         for (int m = 0; m < me[x]->connectors[k].routes.size(); m++)
 268                                         {
 269                                                 if (!strcasecmp(me[x]->connectors[k].routes[m].c_str(),servername.c_str()))
 270                                                 {
 271                                                         return true;
 272                                                 }
 273                                         }
 274                                 }
 275                                 return false;
 276                         }
 277                         else return true;
 278                 }
 279         }
 280         return false;
 281 }
 282
 283
 284 void serverrec::FlushWriteBuffers()
 285 {
 286         for (int i = 0; i < this->connectors.size(); i++)
 287         {
 288                 // don't try and ping a NOAUTH_OUTBOUND state, its not authed yet!
 289                 if ((this->connectors[i].GetState() == STATE_NOAUTH_OUTBOUND) && (TIME > this->connectors[i].age+30))
 290                 {
 291                         // however if we reach this timer its connected timed out :)
 292                         WriteOpers("*** Connection to %s timed out",this->connectors[i].GetServerName().c_str());
 293                         DoSplit(this->connectors[i].GetServerName().c_str());
 294                         return;
 295                 }
 296                 else if ((this->connectors[i].GetState() == STATE_NOAUTH_INBOUND) && (TIME > this->connectors[i].age+30))
 297                 {
 298                         WriteOpers("*** Connection from %s timed out",this->connectors[i].GetServerName().c_str());
 299                         DoSplit(this->connectors[i].GetServerName().c_str());
 300                         return;
 301                 }
 302                 else if (this->connectors[i].GetState() != STATE_DISCONNECTED)
 303                 {
 304                         if (!this->connectors[i].CheckPing())
 305                         {
 306                                 WriteOpers("*** Lost single connection to %s: Ping timeout",this->connectors[i].GetServerName().c_str());
 307                                 this->connectors[i].CloseConnection();
 308                                 this->connectors[i].SetState(STATE_DISCONNECTED);
 309                                 if (!IsRoutable(this->connectors[i].GetServerName()))
 310                                 {
 311                                         WriteOpers("*** Server %s is no longer routable, disconnecting.",this->connectors[i].GetServerName().c_str());
 312                                         DoSplit(this->connectors[i].GetServerName().c_str());
 313                                 }
 314                                 has_been_netsplit = true;
 315                         }
 316                 }
 317                 if (this->connectors[i].HasBufferedOutput())
 318                 {
 319                         if (!this->connectors[i].FlushWriteBuf())
 320                         {
 321                                 // if we're here the write() caused an error, we cannot proceed
 322                                 WriteOpers("*** Lost single connection to %s, link inactive and retrying: %s",this->connectors[i].GetServerName().c_str(),this->connectors[i].GetWriteError().c_str());
 323                                 this->connectors[i].CloseConnection();
 324                                 this->connectors[i].SetState(STATE_DISCONNECTED);
 325                                 if (!IsRoutable(this->connectors[i].GetServerName()))
 326                                 {
 327                                         WriteOpers("*** Server %s is no longer routable, disconnecting.",this->connectors[i].GetServerName().c_str());
 328                                         DoSplit(this->connectors[i].GetServerName().c_str());
 329                                 }
 330                                 has_been_netsplit = true;
 331                         }
 332                 }
 333         }
 334 }
 335
 336 bool serverrec::SendPacket(char *message, const char* sendhost)
 337 {
 338         if ((!message) || (!sendhost))
 339                 return true;
 340
 341         ircd_connector* cn = this->FindHost(sendhost);
 342
 343         if (!strchr(message,'\n'))
 344         {
 345                 strlcat(message,"\n",MAXBUF);
 346         }
 347
 348         if (cn)
 349         {
 350                 log(DEBUG,"main: serverrec::SendPacket() sent '%s' to %s",message,cn->GetServerName().c_str());
 351
 352                 if (cn->GetState() == STATE_DISCONNECTED)
 353                 {
 354                         // fix: can only route one hop to avoid a loop
 355                         if (strncmp(message,"R ",2))
 356                         {
 357                                 log(DEBUG,"Not a double reroute");
 358                                 // this route is down, we must re-route the packet through an available point in the mesh.
 359                                 for (int k = 0; k < this->connectors.size(); k++)
 360                                 {
 361                                         log(DEBUG,"Check connector %d: %s",k,this->connectors[k].GetServerName().c_str());
 362                                         // search for another point in the mesh which can 'reach' where we want to go
 363                                         for (int m = 0; m < this->connectors[k].routes.size(); m++)
 364                                         {
 365                                                 if (!strcasecmp(this->connectors[k].routes[m].c_str(),sendhost))
 366                                                 {
 367                                                         log(DEBUG,"Found alternative route for packet: %s",this->connectors[k].GetServerName().c_str());
 368                                                         char buffer[MAXBUF];
 369                                                         snprintf(buffer,MAXBUF,"R %s %s",sendhost,message);
 370                                                         this->SendPacket(buffer,this->connectors[k].GetServerName().c_str());
 371                                                         return true;
 372                                                 }
 373                                         }
 374                                 }
 375                         }
 376                         char buffer[MAXBUF];
 377                         snprintf(buffer,MAXBUF,"& %s",sendhost);
 378                         WriteOpers("*** All connections to %s lost.",sendhost);
 379                         NetSendToAllExcept(sendhost,buffer);
 380                         DoSplit(sendhost);
 381                         return false;
 382                 }
 383
 384                 // returns false if the packet could not be sent (e.g. target host down)
 385                 if (!cn->AddWriteBuf(message))
 386                 {
 387                         // if we're here, there was an error pending, and the send cannot proceed
 388                         log(DEBUG,"cn->AddWriteBuf() failed for serverrec::SendPacket(): %s",cn->GetWriteError().c_str());
 389                         log(DEBUG,"Disabling connector: %s",cn->GetServerName().c_str());
 390                         cn->CloseConnection();
 391                         cn->SetState(STATE_DISCONNECTED);
 392                         WriteOpers("*** Lost single connection to %s, link inactive and retrying: %s",cn->GetServerName().c_str(),cn->GetWriteError().c_str());
 393                         // retry the packet along a new route so either arrival OR failure are gauranteed (bugfix)
 394                         return this->SendPacket(message,sendhost);
 395                 }
 396                 if (!cn->FlushWriteBuf())
 397                 {
 398                         // if we're here the write() caused an error, we cannot proceed
 399                         log(DEBUG,"cn->FlushWriteBuf() failed for serverrec::SendPacket(): %s",cn->GetWriteError().c_str());
 400                         log(DEBUG,"Disabling connector: %s",cn->GetServerName().c_str());
 401                         cn->CloseConnection();
 402                         cn->SetState(STATE_DISCONNECTED);
 403                         WriteOpers("*** Lost single connection to %s, link inactive and retrying: %s",cn->GetServerName().c_str(),cn->GetWriteError().c_str());
 404                         // retry the packet along a new route so either arrival OR failure are gauranteed
 405                         return this->SendPacket(message,sendhost);
 406                 }
 407                 return true;
 408         }
 409 }
 410
 411 bool already_have_sum(std::string sum)
 412 {
 413         for (int i = 0; i < xsums.size(); i++)
 414         {
 415                 if (xsums[i] == sum)
 416                 {
 417                         return true;
 418                 }
 419         }
 420         if (xsums.size() >= 128)
 421         {
 422                 xsums.pop_front();
 423         }
 424         xsums.push_back(sum);
 425         return false;
 426 }
 427
 428 // receives a packet from any where there is data waiting, first come, first served
 429 // fills the message and host values with the host where the data came from.
 430
 431 bool serverrec::RecvPacket(std::deque<std::string> &messages, char* recvhost,std::deque<std::string> &sums)
 432 {
 433         char data[65536];
 434         memset(data, 0, 65536);
 435         for (int i = 0; i < this->connectors.size(); i++)
 436         {
 437                 if (this->connectors[i].GetState() != STATE_DISCONNECTED)
 438                 {
 439                         // returns false if the packet could not be sent (e.g. target host down)
 440                         int rcvsize = 0;
 441
 442                         // check if theres any data on this socket
 443                         // if not, continue onwards to the next.
 444                         pollfd polls;
 445                         polls.fd = this->connectors[i].GetDescriptor();
 446                         polls.events = POLLIN;
 447                         int ret = poll(&polls,1,1);
 448                         if (ret <= 0) continue;
 449
 450                         rcvsize = recv(this->connectors[i].GetDescriptor(),data,65000,0);
 451                         data[rcvsize] = '\0';
 452                         if (rcvsize == -1)
 453                         {
 454                                 if (errno != EAGAIN)
 455                                 {
 456                                         log(DEBUG,"recv() failed for serverrec::RecvPacket(): %s",strerror(errno));
 457                                         log(DEBUG,"Disabling connector: %s",this->connectors[i].GetServerName().c_str());
 458                                         this->connectors[i].CloseConnection();
 459                                         this->connectors[i].SetState(STATE_DISCONNECTED);
 460                                         if (!IsRoutable(this->connectors[i].GetServerName()))
 461                                         {
 462                                                 WriteOpers("*** Server %s is no longer routable, disconnecting.",this->connectors[i].GetServerName().c_str());
 463                                                 DoSplit(this->connectors[i].GetServerName().c_str());
 464                                         }
 465                                         has_been_netsplit = true;
 466                                 }
 467                         }
 468                         int pushed = 0;
 469                         if (rcvsize > 0)
 470                         {
 471                                 if (!this->connectors[i].AddBuffer(data))
 472                                 {
 473                                         WriteOpers("*** Read buffer for %s exceeds maximum, closing connection!",this->connectors[i].GetServerName().c_str());
 474                                         this->connectors[i].CloseConnection();
 475                                         this->connectors[i].SetState(STATE_DISCONNECTED);
 476                                         if (!IsRoutable(this->connectors[i].GetServerName()))
 477                                         {
 478                                                 WriteOpers("*** Server %s is no longer routable, disconnecting.",this->connectors[i].GetServerName().c_str());
 479                                                 DoSplit(this->connectors[i].GetServerName().c_str());
 480                                         }
 481                                         has_been_netsplit = true;
 482                                 }
 483                                 if (this->connectors[i].BufferIsComplete())
 484                                 {
 485                                         this->connectors[i].ResetPing();
 486                                         while (this->connectors[i].BufferIsComplete())
 487                                         {
 488                                                 std::string text = this->connectors[i].GetBuffer();
 489                                                 if (text != "")
 490                                                 {
 491                                                         if ((text[0] == ':') && (text.find(" ") != std::string::npos))
 492                                                         {
 493                                                                 std::string orig = text;
 494                                                                 log(DEBUG,"Original: %s",text.c_str());
 495                                                                 std::string sum = text.substr(1,text.find(" ")-1);
 496                                                                 text = text.substr(text.find(" ")+1,text.length());
 497                                                                 std::string possible_token = text.substr(1,text.find(" ")-1);
 498                                                                 if (possible_token.length() > 1)
 499                                                                 {
 500                                                                         sums.push_back("*");
 501                                                                         text = orig;
 502                                                                         log(DEBUG,"Non-mesh, non-tokenized string passed up the chain");
 503                                                                 }
 504                                                                 else
 505                                                                 {
 506                                                                         log(DEBUG,"Packet sum: '%s'",sum.c_str());
 507                                                                         if ((already_have_sum(sum)) && (sum != "*"))
 508                                                                         {
 509                                                                                 // we don't accept dupes
 510                                                                                 continue;
 511                                                                         }
 512                                                                         sums.push_back(sum.c_str());
 513                                                                 }
 514                                                         }
 515                                                         else sums.push_back("*");
 516                                                         messages.push_back(text.c_str());
 517                                                         strlcpy(recvhost,this->connectors[i].GetServerName().c_str(),160);
 518                                                         log(DEBUG,"serverrec::RecvPacket() %d:%s->%s",pushed++,recvhost,text.c_str());
 519                                                 }
 520                                         }
 521                                         return true;
 522                                 }
 523                         }
 524                 }
 525         }
 526         // nothing new yet -- message and host will be undefined
 527         return false;
 528 }
 529