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 #include "commandbuilder.h"
  31
  32 SpanningTreeUtilities* Utils = NULL;
  33
  34 /* Create server sockets off a listener. */
  35 ModResult ModuleSpanningTree::OnAcceptConnection(int newsock, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  36 {
  37         if (from->bind_tag->getString("type") != "servers")
  38                 return MOD_RES_PASSTHRU;
  39
  40         std::string incomingip = client->addr();
  41
  42         for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  43         {
  44                 if (*i == "*" || *i == incomingip || irc::sockets::cidr_mask(*i).match(*client))
  45                 {
  46                         /* we don't need to do anything with the pointer, creating it stores it in the necessary places */
  47                         new TreeSocket(newsock, from, client, server);
  48                         return MOD_RES_ALLOW;
  49                 }
  50         }
  51         ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", incomingip.c_str());
  52         return MOD_RES_DENY;
  53 }
  54
  55 /** Yay for fast searches!
  56  * This is hundreds of times faster than recursion
  57  * or even scanning a linked list, especially when
  58  * there are more than a few servers to deal with.
  59  * (read as: lots).
  60  */
  61 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  62 {
  63         if (InspIRCd::IsSID(ServerName))
  64                 return this->FindServerID(ServerName);
  65
  66         server_hash::iterator iter = serverlist.find(ServerName);
  67         if (iter != serverlist.end())
  68         {
  69                 return iter->second;
  70         }
  71         else
  72         {
  73                 return NULL;
  74         }
  75 }
  76
  77 /** Returns the locally connected server we must route a
  78  * message through to reach server 'ServerName'. This
  79  * only applies to one-to-one and not one-to-many routing.
  80  * See the comments for the constructor of TreeServer
  81  * for more details.
  82  */
  83 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
  84 {
  85         TreeServer* Found = FindServer(ServerName);
  86         if (Found)
  87         {
  88                 return Found->GetRoute();
  89         }
  90         else
  91         {
  92                 // Cheat a bit. This allows for (better) working versions of routing commands with nick based prefixes, without hassle
  93                 User *u = ServerInstance->FindNick(ServerName);
  94                 if (u)
  95                 {
  96                         Found = FindServer(u->server);
  97                         if (Found)
  98                                 return Found->GetRoute();
  99                 }
 100
 101                 return NULL;
 102         }
 103 }
 104
 105 /** Find the first server matching a given glob mask.
 106  * Theres no find-using-glob method of hash_map [awwww :-(]
 107  * so instead, we iterate over the list using an iterator
 108  * and match each one until we get a hit. Yes its slow,
 109  * deal with it.
 110  */
 111 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 112 {
 113         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 114         {
 115                 if (InspIRCd::Match(i->first,ServerName))
 116                         return i->second;
 117         }
 118         return NULL;
 119 }
 120
 121 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 122 {
 123         server_hash::iterator iter = sidlist.find(id);
 124         if (iter != sidlist.end())
 125                 return iter->second;
 126         else
 127                 return NULL;
 128 }
 129
 130 SpanningTreeUtilities::SpanningTreeUtilities(ModuleSpanningTree* C)
 131         : Creator(C), TreeRoot(NULL)
 132 {
 133         ServerInstance->Timers->AddTimer(&RefreshTimer);
 134
 135         this->ReadConfiguration();
 136 }
 137
 138 CullResult SpanningTreeUtilities::cull()
 139 {
 140         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 141         while (!children.empty())
 142         {
 143                 TreeSocket* sock = children.front()->GetSocket();
 144                 sock->Close();
 145         }
 146
 147         for(std::map<TreeSocket*, std::pair<std::string, int> >::iterator i = timeoutlist.begin(); i != timeoutlist.end(); ++i)
 148         {
 149                 TreeSocket* s = i->first;
 150                 s->Close();
 151         }
 152         TreeRoot->cull();
 153
 154         return classbase::cull();
 155 }
 156
 157 SpanningTreeUtilities::~SpanningTreeUtilities()
 158 {
 159         delete TreeRoot;
 160 }
 161
 162 /* returns a list of DIRECT servernames for a specific channel */
 163 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeSocketSet& list, char status, const CUList& exempt_list)
 164 {
 165         unsigned int minrank = 0;
 166         if (status)
 167         {
 168                 ModeHandler* mh = ServerInstance->Modes->FindPrefix(status);
 169                 if (mh)
 170                         minrank = mh->GetPrefixRank();
 171         }
 172
 173         const UserMembList *ulist = c->GetUsers();
 174
 175         for (UserMembCIter i = ulist->begin(); i != ulist->end(); i++)
 176         {
 177                 if (IS_LOCAL(i->first))
 178                         continue;
 179
 180                 if (minrank && i->second->getRank() < minrank)
 181                         continue;
 182
 183                 if (exempt_list.find(i->first) == exempt_list.end())
 184                 {
 185                         TreeServer* best = this->BestRouteTo(i->first->server);
 186                         if (best)
 187                                 list.insert(best->GetSocket());
 188                 }
 189         }
 190         return;
 191 }
 192
 193 void SpanningTreeUtilities::DoOneToAllButSender(const CmdBuilder& params, TreeServer* omitroute)
 194 {
 195         const std::string& FullLine = params.str();
 196
 197         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 198         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 199         {
 200                 TreeServer* Route = *i;
 201                 // Send the line if the route isn't the path to the one to be omitted
 202                 if (Route != omitroute)
 203                 {
 204                         Route->GetSocket()->WriteLine(FullLine);
 205                 }
 206         }
 207 }
 208
 209 bool SpanningTreeUtilities::DoOneToOne(const CmdBuilder& params, const std::string& target)
 210 {
 211         TreeServer* Route = this->BestRouteTo(target);
 212         if (!Route)
 213                 return false;
 214
 215         Route->GetSocket()->WriteLine(params);
 216         return true;
 217 }
 218
 219 void SpanningTreeUtilities::RefreshIPCache()
 220 {
 221         ValidIPs.clear();
 222         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 223         {
 224                 Link* L = *i;
 225                 if (!L->Port)
 226                 {
 227                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring a link block without a port.");
 228                         /* Invalid link block */
 229                         continue;
 230                 }
 231
 232                 if (L->AllowMask.length())
 233                         ValidIPs.push_back(L->AllowMask);
 234
 235                 irc::sockets::sockaddrs dummy;
 236                 bool ipvalid = irc::sockets::aptosa(L->IPAddr, L->Port, dummy);
 237                 if ((L->IPAddr == "*") || (ipvalid))
 238                         ValidIPs.push_back(L->IPAddr);
 239                 else if (this->Creator->DNS)
 240                 {
 241                         SecurityIPResolver* sr = new SecurityIPResolver(Creator, *this->Creator->DNS, L->IPAddr, L, DNS::QUERY_AAAA);
 242                         try
 243                         {
 244                                 this->Creator->DNS->Process(sr);
 245                         }
 246                         catch (DNS::Exception &)
 247                         {
 248                                 delete sr;
 249                         }
 250                 }
 251         }
 252 }
 253
 254 void SpanningTreeUtilities::ReadConfiguration()
 255 {
 256         ConfigTag* security = ServerInstance->Config->ConfValue("security");
 257         ConfigTag* options = ServerInstance->Config->ConfValue("options");
 258         FlatLinks = security->getBool("flatlinks");
 259         HideULines = security->getBool("hideulines");
 260         AnnounceTSChange = options->getBool("announcets");
 261         AllowOptCommon = options->getBool("allowmismatch");
 262         ChallengeResponse = !security->getBool("disablehmac");
 263         quiet_bursts = ServerInstance->Config->ConfValue("performance")->getBool("quietbursts");
 264         PingWarnTime = options->getInt("pingwarning");
 265         PingFreq = options->getInt("serverpingfreq");
 266
 267         if (PingFreq == 0)
 268                 PingFreq = 60;
 269
 270         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 271                 PingWarnTime = 0;
 272
 273         AutoconnectBlocks.clear();
 274         LinkBlocks.clear();
 275         ConfigTagList tags = ServerInstance->Config->ConfTags("link");
 276         for(ConfigIter i = tags.first; i != tags.second; ++i)
 277         {
 278                 ConfigTag* tag = i->second;
 279                 reference<Link> L = new Link(tag);
 280                 std::string linkname = tag->getString("name");
 281                 L->Name = linkname.c_str();
 282                 L->AllowMask = tag->getString("allowmask");
 283                 L->IPAddr = tag->getString("ipaddr");
 284                 L->Port = tag->getInt("port");
 285                 L->SendPass = tag->getString("sendpass", tag->getString("password"));
 286                 L->RecvPass = tag->getString("recvpass", tag->getString("password"));
 287                 L->Fingerprint = tag->getString("fingerprint");
 288                 L->HiddenFromStats = tag->getBool("statshidden");
 289                 L->Timeout = tag->getDuration("timeout", 30);
 290                 L->Hook = tag->getString("ssl");
 291                 L->Bind = tag->getString("bind");
 292                 L->Hidden = tag->getBool("hidden");
 293
 294                 if (L->Name.empty())
 295                         throw ModuleException("Invalid configuration, found a link tag without a name!" + (!L->IPAddr.empty() ? " IP address: "+L->IPAddr : ""));
 296
 297                 if (L->Name.find('.') == std::string::npos)
 298                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it must contain at least one '.' character");
 299
 300                 if (L->Name.length() > 64)
 301                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it is longer than 64 characters");
 302
 303                 if (L->RecvPass.empty())
 304                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', recvpass not defined");
 305
 306                 if (L->SendPass.empty())
 307                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', sendpass not defined");
 308
 309                 if ((L->SendPass.find(' ') != std::string::npos) || (L->RecvPass.find(' ') != std::string::npos))
 310                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that contains a space character which is invalid");
 311
 312                 if ((L->SendPass[0] == ':') || (L->RecvPass[0] == ':'))
 313                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that begins with a colon (:) which is invalid");
 314
 315                 if (L->IPAddr.empty())
 316                 {
 317                         L->IPAddr = "*";
 318                         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.");
 319                 }
 320
 321                 if (!L->Port)
 322                         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.");
 323
 324                 L->Fingerprint.erase(std::remove(L->Fingerprint.begin(), L->Fingerprint.end(), ':'), L->Fingerprint.end());
 325                 LinkBlocks.push_back(L);
 326         }
 327
 328         tags = ServerInstance->Config->ConfTags("autoconnect");
 329         for(ConfigIter i = tags.first; i != tags.second; ++i)
 330         {
 331                 ConfigTag* tag = i->second;
 332                 reference<Autoconnect> A = new Autoconnect(tag);
 333                 A->Period = tag->getDuration("period", 60, 1);
 334                 A->NextConnectTime = ServerInstance->Time() + A->Period;
 335                 A->position = -1;
 336                 irc::spacesepstream ss(tag->getString("server"));
 337                 std::string server;
 338                 while (ss.GetToken(server))
 339                 {
 340                         A->servers.push_back(server);
 341                 }
 342
 343                 if (A->servers.empty())
 344                 {
 345                         throw ModuleException("Invalid configuration for autoconnect, server cannot be empty!");
 346                 }
 347
 348                 AutoconnectBlocks.push_back(A);
 349         }
 350
 351         RefreshIPCache();
 352 }
 353
 354 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 355 {
 356         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 357         {
 358                 Link* x = *i;
 359                 if (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 360                 {
 361                         return x;
 362                 }
 363         }
 364         return NULL;
 365 }
 366
 367 void SpanningTreeUtilities::SendChannelMessage(const std::string& prefix, Channel* target, const std::string& text, char status, const CUList& exempt_list, const char* message_type, TreeSocket* omit)
 368 {
 369         CmdBuilder msg(prefix, message_type);
 370         if (status == 0)
 371                 status = ' ';
 372         msg.push(status).push_raw(target->name).push_last(text);
 373
 374         TreeSocketSet list;
 375         this->GetListOfServersForChannel(target, list, status, exempt_list);
 376         for (TreeSocketSet::iterator i = list.begin(); i != list.end(); ++i)
 377         {
 378                 TreeSocket* Sock = *i;
 379                 if (Sock != omit)
 380                         Sock->WriteLine(msg);
 381         }
 382 }