src/modules/m_spanningtree/utils.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2009 Craig Edwards <craigedwards@brainbox.cc>
   6  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
   7  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   8  *
   9  * This file is part of InspIRCd.  InspIRCd is free software: you can
  10  * redistribute it and/or modify it under the terms of the GNU General Public
  11  * License as published by the Free Software Foundation, version 2.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22
  23 #include "inspircd.h"
  24
  25 #include "main.h"
  26 #include "utils.h"
  27 #include "treeserver.h"
  28 #include "treesocket.h"
  29 #include "resolvers.h"
  30
  31 /* Create server sockets off a listener. */
  32 ModResult ModuleSpanningTree::OnAcceptConnection(int newsock, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  33 {
  34         if (from->bind_tag->getString("type") != "servers")
  35                 return MOD_RES_PASSTHRU;
  36
  37         std::string incomingip = client->addr();
  38
  39         for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  40         {
  41                 if (*i == "*" || *i == incomingip || irc::sockets::cidr_mask(*i).match(*client))
  42                 {
  43                         /* we don't need to do anything with the pointer, creating it stores it in the necessary places */
  44                         new TreeSocket(Utils, newsock, from, client, server);
  45                         return MOD_RES_ALLOW;
  46                 }
  47         }
  48         ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", incomingip.c_str());
  49         return MOD_RES_DENY;
  50 }
  51
  52 /** Yay for fast searches!
  53  * This is hundreds of times faster than recursion
  54  * or even scanning a linked list, especially when
  55  * there are more than a few servers to deal with.
  56  * (read as: lots).
  57  */
  58 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  59 {
  60         if (InspIRCd::IsSID(ServerName))
  61                 return this->FindServerID(ServerName);
  62
  63         server_hash::iterator iter = serverlist.find(ServerName);
  64         if (iter != serverlist.end())
  65         {
  66                 return iter->second;
  67         }
  68         else
  69         {
  70                 return NULL;
  71         }
  72 }
  73
  74 /** Returns the locally connected server we must route a
  75  * message through to reach server 'ServerName'. This
  76  * only applies to one-to-one and not one-to-many routing.
  77  * See the comments for the constructor of TreeServer
  78  * for more details.
  79  */
  80 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
  81 {
  82         if (ServerName == TreeRoot->GetName() || ServerName == ServerInstance->Config->GetSID())
  83                 return NULL;
  84         TreeServer* Found = FindServer(ServerName);
  85         if (Found)
  86         {
  87                 return Found->GetRoute();
  88         }
  89         else
  90         {
  91                 // Cheat a bit. This allows for (better) working versions of routing commands with nick based prefixes, without hassle
  92                 User *u = ServerInstance->FindNick(ServerName);
  93                 if (u)
  94                 {
  95                         Found = FindServer(u->server);
  96                         if (Found)
  97                                 return Found->GetRoute();
  98                 }
  99
 100                 return NULL;
 101         }
 102 }
 103
 104 /** Find the first server matching a given glob mask.
 105  * Theres no find-using-glob method of hash_map [awwww :-(]
 106  * so instead, we iterate over the list using an iterator
 107  * and match each one until we get a hit. Yes its slow,
 108  * deal with it.
 109  */
 110 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 111 {
 112         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 113         {
 114                 if (InspIRCd::Match(i->first,ServerName))
 115                         return i->second;
 116         }
 117         return NULL;
 118 }
 119
 120 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 121 {
 122         server_hash::iterator iter = sidlist.find(id);
 123         if (iter != sidlist.end())
 124                 return iter->second;
 125         else
 126                 return NULL;
 127 }
 128
 129 SpanningTreeUtilities::SpanningTreeUtilities(ModuleSpanningTree* C)
 130         : RefreshTimer(this), Creator(C)
 131 {
 132         ServerInstance->Timers->AddTimer(&RefreshTimer);
 133
 134         this->TreeRoot = new TreeServer(this);
 135         this->ReadConfiguration();
 136 }
 137
 138 CullResult SpanningTreeUtilities::cull()
 139 {
 140         while (TreeRoot->ChildCount())
 141         {
 142                 TreeServer* child_server = TreeRoot->GetChild(0);
 143                 if (child_server)
 144                 {
 145                         TreeSocket* sock = child_server->GetSocket();
 146                         sock->Close();
 147                 }
 148         }
 149
 150         for(std::map<TreeSocket*, std::pair<std::string, int> >::iterator i = timeoutlist.begin(); i != timeoutlist.end(); ++i)
 151         {
 152                 TreeSocket* s = i->first;
 153                 s->Close();
 154         }
 155         TreeRoot->cull();
 156
 157         return classbase::cull();
 158 }
 159
 160 SpanningTreeUtilities::~SpanningTreeUtilities()
 161 {
 162         delete TreeRoot;
 163 }
 164
 165 /* returns a list of DIRECT servernames for a specific channel */
 166 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 167 {
 168         unsigned int minrank = 0;
 169         if (status)
 170         {
 171                 ModeHandler* mh = ServerInstance->Modes->FindPrefix(status);
 172                 if (mh)
 173                         minrank = mh->GetPrefixRank();
 174         }
 175
 176         const UserMembList *ulist = c->GetUsers();
 177
 178         for (UserMembCIter i = ulist->begin(); i != ulist->end(); i++)
 179         {
 180                 if (IS_LOCAL(i->first))
 181                         continue;
 182
 183                 if (minrank && i->second->getRank() < minrank)
 184                         continue;
 185
 186                 if (exempt_list.find(i->first) == exempt_list.end())
 187                 {
 188                         TreeServer* best = this->BestRouteTo(i->first->server);
 189                         if (best)
 190                                 list.insert(best);
 191                 }
 192         }
 193         return;
 194 }
 195
 196 std::string SpanningTreeUtilities::ConstructLine(const std::string& prefix, const std::string& command, const parameterlist& params)
 197 {
 198         std::string FullLine;
 199         FullLine.reserve(1024);
 200         FullLine = ":" + prefix + " " + command;
 201         for (parameterlist::const_iterator x = params.begin(); x != params.end(); ++x)
 202         {
 203                 FullLine.push_back(' ');
 204                 FullLine.append(*x);
 205         }
 206         return FullLine;
 207 }
 208
 209 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string& prefix, const std::string& command, const parameterlist& params, const std::string& omit)
 210 {
 211         TreeServer* omitroute = this->BestRouteTo(omit);
 212         std::string FullLine = ConstructLine(prefix, command, params);
 213
 214         unsigned int items = this->TreeRoot->ChildCount();
 215         for (unsigned int x = 0; x < items; x++)
 216         {
 217                 TreeServer* Route = this->TreeRoot->GetChild(x);
 218                 // Send the line IF:
 219                 // The route has a socket (its a direct connection)
 220                 // The route isnt the one to be omitted
 221                 // The route isnt the path to the one to be omitted
 222                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 223                 {
 224                         TreeSocket* Sock = Route->GetSocket();
 225                         if (Sock)
 226                                 Sock->WriteLine(FullLine);
 227                 }
 228         }
 229         return true;
 230 }
 231
 232 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, const parameterlist &params)
 233 {
 234         std::string FullLine = ConstructLine(prefix, command, params);
 235
 236         unsigned int items = this->TreeRoot->ChildCount();
 237         for (unsigned int x = 0; x < items; x++)
 238         {
 239                 TreeServer* Route = this->TreeRoot->GetChild(x);
 240                 if (Route && Route->GetSocket())
 241                 {
 242                         TreeSocket* Sock = Route->GetSocket();
 243                         if (Sock)
 244                                 Sock->WriteLine(FullLine);
 245                 }
 246         }
 247         return true;
 248 }
 249
 250 bool SpanningTreeUtilities::DoOneToOne(const std::string& prefix, const std::string& command, const parameterlist& params, const std::string& target)
 251 {
 252         TreeServer* Route = this->BestRouteTo(target);
 253         if (Route)
 254         {
 255                 if (Route && Route->GetSocket())
 256                 {
 257                         TreeSocket* Sock = Route->GetSocket();
 258                         if (Sock)
 259                                 Sock->WriteLine(ConstructLine(prefix, command, params));
 260                 }
 261                 return true;
 262         }
 263         else
 264         {
 265                 return false;
 266         }
 267 }
 268
 269 void SpanningTreeUtilities::RefreshIPCache()
 270 {
 271         ValidIPs.clear();
 272         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 273         {
 274                 Link* L = *i;
 275                 if (!L->Port)
 276                 {
 277                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring a link block without a port.");
 278                         /* Invalid link block */
 279                         continue;
 280                 }
 281
 282                 if (L->AllowMask.length())
 283                         ValidIPs.push_back(L->AllowMask);
 284
 285                 irc::sockets::sockaddrs dummy;
 286                 bool ipvalid = irc::sockets::aptosa(L->IPAddr, L->Port, dummy);
 287                 if ((L->IPAddr == "*") || (ipvalid))
 288                         ValidIPs.push_back(L->IPAddr);
 289                 else if (this->Creator->DNS)
 290                 {
 291                         SecurityIPResolver* sr = new SecurityIPResolver(Creator, this, *this->Creator->DNS, L->IPAddr, L, DNS::QUERY_AAAA);
 292                         try
 293                         {
 294                                 this->Creator->DNS->Process(sr);
 295                         }
 296                         catch (DNS::Exception &)
 297                         {
 298                                 delete sr;
 299                         }
 300                 }
 301         }
 302 }
 303
 304 void SpanningTreeUtilities::ReadConfiguration()
 305 {
 306         ConfigTag* security = ServerInstance->Config->ConfValue("security");
 307         ConfigTag* options = ServerInstance->Config->ConfValue("options");
 308         FlatLinks = security->getBool("flatlinks");
 309         HideULines = security->getBool("hideulines");
 310         AnnounceTSChange = options->getBool("announcets");
 311         AllowOptCommon = options->getBool("allowmismatch");
 312         ChallengeResponse = !security->getBool("disablehmac");
 313         quiet_bursts = ServerInstance->Config->ConfValue("performance")->getBool("quietbursts");
 314         PingWarnTime = options->getInt("pingwarning");
 315         PingFreq = options->getInt("serverpingfreq");
 316
 317         if (PingFreq == 0)
 318                 PingFreq = 60;
 319
 320         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 321                 PingWarnTime = 0;
 322
 323         AutoconnectBlocks.clear();
 324         LinkBlocks.clear();
 325         ConfigTagList tags = ServerInstance->Config->ConfTags("link");
 326         for(ConfigIter i = tags.first; i != tags.second; ++i)
 327         {
 328                 ConfigTag* tag = i->second;
 329                 reference<Link> L = new Link(tag);
 330                 std::string linkname = tag->getString("name");
 331                 L->Name = linkname.c_str();
 332                 L->AllowMask = tag->getString("allowmask");
 333                 L->IPAddr = tag->getString("ipaddr");
 334                 L->Port = tag->getInt("port");
 335                 L->SendPass = tag->getString("sendpass", tag->getString("password"));
 336                 L->RecvPass = tag->getString("recvpass", tag->getString("password"));
 337                 L->Fingerprint = tag->getString("fingerprint");
 338                 L->HiddenFromStats = tag->getBool("statshidden");
 339                 L->Timeout = tag->getInt("timeout", 30);
 340                 L->Hook = tag->getString("ssl");
 341                 L->Bind = tag->getString("bind");
 342                 L->Hidden = tag->getBool("hidden");
 343
 344                 if (L->Name.empty())
 345                         throw ModuleException("Invalid configuration, found a link tag without a name!" + (!L->IPAddr.empty() ? " IP address: "+L->IPAddr : ""));
 346
 347                 if (L->Name.find('.') == std::string::npos)
 348                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it must contain at least one '.' character");
 349
 350                 if (L->Name.length() > 64)
 351                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it is longer than 64 characters");
 352
 353                 if (L->RecvPass.empty())
 354                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', recvpass not defined");
 355
 356                 if (L->SendPass.empty())
 357                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', sendpass not defined");
 358
 359                 if ((L->SendPass.find(' ') != std::string::npos) || (L->RecvPass.find(' ') != std::string::npos))
 360                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that contains a space character which is invalid");
 361
 362                 if ((L->SendPass[0] == ':') || (L->RecvPass[0] == ':'))
 363                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that begins with a colon (:) which is invalid");
 364
 365                 if (L->IPAddr.empty())
 366                 {
 367                         L->IPAddr = "*";
 368                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Configuration warning: Link block '" + assign(L->Name) + "' has no IP defined! This will allow any IP to connect as this server, and MAY not be what you want.");
 369                 }
 370
 371                 if (!L->Port)
 372                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Configuration warning: Link block '" + assign(L->Name) + "' has no port defined, you will not be able to /connect it.");
 373
 374                 L->Fingerprint.erase(std::remove(L->Fingerprint.begin(), L->Fingerprint.end(), ':'), L->Fingerprint.end());
 375                 LinkBlocks.push_back(L);
 376         }
 377
 378         tags = ServerInstance->Config->ConfTags("autoconnect");
 379         for(ConfigIter i = tags.first; i != tags.second; ++i)
 380         {
 381                 ConfigTag* tag = i->second;
 382                 reference<Autoconnect> A = new Autoconnect(tag);
 383                 A->Period = tag->getInt("period");
 384                 A->NextConnectTime = ServerInstance->Time() + A->Period;
 385                 A->position = -1;
 386                 irc::spacesepstream ss(tag->getString("server"));
 387                 std::string server;
 388                 while (ss.GetToken(server))
 389                 {
 390                         A->servers.push_back(server);
 391                 }
 392
 393                 if (A->Period <= 0)
 394                 {
 395                         throw ModuleException("Invalid configuration for autoconnect, period not a positive integer!");
 396                 }
 397
 398                 if (A->servers.empty())
 399                 {
 400                         throw ModuleException("Invalid configuration for autoconnect, server cannot be empty!");
 401                 }
 402
 403                 AutoconnectBlocks.push_back(A);
 404         }
 405
 406         RefreshIPCache();
 407 }
 408
 409 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 410 {
 411         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 412         {
 413                 Link* x = *i;
 414                 if (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 415                 {
 416                         return x;
 417                 }
 418         }
 419         return NULL;
 420 }
 421
 422 void SpanningTreeUtilities::SendChannelMessage(const std::string& prefix, Channel* target, const std::string &text, char status, const CUList& exempt_list, const char* message_type)
 423 {
 424         std::string raw(":");
 425         raw.append(prefix).append(1, ' ').append(message_type).push_back(' ');
 426         if (status)
 427                 raw.push_back(status);
 428         raw.append(target->name).append(" :").append(text);
 429
 430         TreeServerList list;
 431         this->GetListOfServersForChannel(target, list, status, exempt_list);
 432         for (TreeServerList::iterator i = list.begin(); i != list.end(); ++i)
 433         {
 434                 TreeSocket* Sock = (*i)->GetSocket();
 435                 if (Sock)
 436                         Sock->WriteLine(raw);
 437         }
 438 }