src/modules/m_spanningtree/utils.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2013-2014, 2017-2019, 2021 Sadie Powell <sadie@witchery.services>
   5  *   Copyright (C) 2013 Adam <Adam@anope.org>
   6  *   Copyright (C) 2012-2016 Attila Molnar <attilamolnar@hush.com>
   7  *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
   8  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   9  *   Copyright (C) 2008-2009 Robin Burchell <robin+git@viroteck.net>
  10  *   Copyright (C) 2007-2008, 2010 Craig Edwards <brain@inspircd.org>
  11  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  12  *
  13  * This file is part of InspIRCd.  InspIRCd is free software: you can
  14  * redistribute it and/or modify it under the terms of the GNU General Public
  15  * License as published by the Free Software Foundation, version 2.
  16  *
  17  * This program is distributed in the hope that it will be useful, but WITHOUT
  18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  19  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26
  27 #include "inspircd.h"
  28 #include "listmode.h"
  29
  30 #include "main.h"
  31 #include "utils.h"
  32 #include "treeserver.h"
  33 #include "treesocket.h"
  34 #include "resolvers.h"
  35 #include "commandbuilder.h"
  36
  37 SpanningTreeUtilities* Utils = NULL;
  38
  39 ModResult ModuleSpanningTree::OnAcceptConnection(int newsock, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  40 {
  41         if (!stdalgo::string::equalsci(from->bind_tag->getString("type"), "servers"))
  42                 return MOD_RES_PASSTHRU;
  43
  44         std::string incomingip = client->addr();
  45
  46         for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  47         {
  48                 if (*i == "*" || *i == incomingip || irc::sockets::cidr_mask(*i).match(*client))
  49                 {
  50                         /* we don't need to do anything with the pointer, creating it stores it in the necessary places */
  51                         new TreeSocket(newsock, from, client, server);
  52                         return MOD_RES_ALLOW;
  53                 }
  54         }
  55         ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", incomingip.c_str());
  56         return MOD_RES_DENY;
  57 }
  58
  59 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  60 {
  61         if (InspIRCd::IsSID(ServerName))
  62                 return this->FindServerID(ServerName);
  63
  64         server_hash::iterator iter = serverlist.find(ServerName);
  65         if (iter != serverlist.end())
  66         {
  67                 return iter->second;
  68         }
  69         else
  70         {
  71                 return NULL;
  72         }
  73 }
  74
  75 /** Find the first server matching a given glob mask.
  76  * We iterate over the list and match each one until we get a hit.
  77  */
  78 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
  79 {
  80         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
  81         {
  82                 if (InspIRCd::Match(i->first,ServerName))
  83                         return i->second;
  84         }
  85         return NULL;
  86 }
  87
  88 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
  89 {
  90         server_hash::iterator iter = sidlist.find(id);
  91         if (iter != sidlist.end())
  92                 return iter->second;
  93         else
  94                 return NULL;
  95 }
  96
  97 TreeServer* SpanningTreeUtilities::FindRouteTarget(const std::string& target)
  98 {
  99         TreeServer* const server = FindServer(target);
 100         if (server)
 101                 return server;
 102
 103         User* const user = ServerInstance->FindNick(target);
 104         if (user)
 105                 return TreeServer::Get(user);
 106
 107         return NULL;
 108 }
 109
 110 SpanningTreeUtilities::SpanningTreeUtilities(ModuleSpanningTree* C)
 111         : Creator(C), TreeRoot(NULL)
 112         , PingFreq(60) // XXX: TreeServer constructor reads this and TreeRoot is created before the config is read, so init it to something (value doesn't matter) to avoid a valgrind warning in TimerManager on unload
 113 {
 114         ServerInstance->Timers.AddTimer(&RefreshTimer);
 115 }
 116
 117 CullResult SpanningTreeUtilities::cull()
 118 {
 119         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 120         while (!children.empty())
 121         {
 122                 TreeSocket* sock = children.front()->GetSocket();
 123                 sock->Close();
 124         }
 125
 126         for(TimeoutList::iterator i = timeoutlist.begin(); i != timeoutlist.end(); ++i)
 127         {
 128                 TreeSocket* s = i->first;
 129                 s->Close();
 130         }
 131         TreeRoot->cull();
 132
 133         return classbase::cull();
 134 }
 135
 136 SpanningTreeUtilities::~SpanningTreeUtilities()
 137 {
 138         delete TreeRoot;
 139 }
 140
 141 // Returns a list of DIRECT servers for a specific channel
 142 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeSocketSet& list, char status, const CUList& exempt_list)
 143 {
 144         unsigned int minrank = 0;
 145         if (status)
 146         {
 147                 PrefixMode* mh = ServerInstance->Modes->FindPrefix(status);
 148                 if (mh)
 149                         minrank = mh->GetPrefixRank();
 150         }
 151
 152         TreeServer::ChildServers children = TreeRoot->GetChildren();
 153         const Channel::MemberMap& ulist = c->GetUsers();
 154         for (Channel::MemberMap::const_iterator i = ulist.begin(); i != ulist.end(); ++i)
 155         {
 156                 if (IS_LOCAL(i->first))
 157                         continue;
 158
 159                 if (minrank && i->second->getRank() < minrank)
 160                         continue;
 161
 162                 if (exempt_list.find(i->first) == exempt_list.end())
 163                 {
 164                         TreeServer* best = TreeServer::Get(i->first);
 165                         list.insert(best->GetSocket());
 166
 167                         TreeServer::ChildServers::iterator citer = std::find(children.begin(), children.end(), best);
 168                         if (citer != children.end())
 169                                 children.erase(citer);
 170                 }
 171         }
 172
 173         // Check whether the servers which do not have users in the channel might need this message. This
 174         // is used to keep the chanhistory module synchronised between servers.
 175         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 176         {
 177                 ModResult result;
 178                 FIRST_MOD_RESULT_CUSTOM(Creator->GetBroadcastEventProvider(), ServerProtocol::BroadcastEventListener, OnBroadcastMessage, result, (c, *i));
 179                 if (result == MOD_RES_ALLOW)
 180                         list.insert((*i)->GetSocket());
 181         }
 182 }
 183
 184 void SpanningTreeUtilities::DoOneToAllButSender(const CmdBuilder& params, TreeServer* omitroute)
 185 {
 186         const std::string& FullLine = params.str();
 187
 188         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 189         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 190         {
 191                 TreeServer* Route = *i;
 192                 // Send the line if the route isn't the path to the one to be omitted
 193                 if (Route != omitroute)
 194                 {
 195                         Route->GetSocket()->WriteLine(FullLine);
 196                 }
 197         }
 198 }
 199
 200 void SpanningTreeUtilities::DoOneToOne(const CmdBuilder& params, Server* server)
 201 {
 202         TreeServer* ts = static_cast<TreeServer*>(server);
 203         TreeSocket* sock = ts->GetSocket();
 204         if (sock)
 205                 sock->WriteLine(params);
 206 }
 207
 208 void SpanningTreeUtilities::RefreshIPCache()
 209 {
 210         ValidIPs.clear();
 211         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 212         {
 213                 Link* L = *i;
 214                 if (!L->Port)
 215                 {
 216                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring a link block without a port.");
 217                         /* Invalid link block */
 218                         continue;
 219                 }
 220
 221                 ValidIPs.insert(ValidIPs.end(), L->AllowMasks.begin(), L->AllowMasks.end());
 222
 223                 irc::sockets::sockaddrs dummy;
 224                 bool ipvalid = irc::sockets::aptosa(L->IPAddr, L->Port, dummy);
 225                 if ((L->IPAddr == "*") || (ipvalid))
 226                         ValidIPs.push_back(L->IPAddr);
 227                 else if (this->Creator->DNS)
 228                 {
 229                         SecurityIPResolver* sr = new SecurityIPResolver(Creator, *this->Creator->DNS, L->IPAddr, L, DNS::QUERY_AAAA);
 230                         try
 231                         {
 232                                 this->Creator->DNS->Process(sr);
 233                         }
 234                         catch (DNS::Exception &)
 235                         {
 236                                 delete sr;
 237                         }
 238                 }
 239         }
 240 }
 241
 242 void SpanningTreeUtilities::ReadConfiguration()
 243 {
 244         ConfigTag* security = ServerInstance->Config->ConfValue("security");
 245         ConfigTag* options = ServerInstance->Config->ConfValue("options");
 246         FlatLinks = security->getBool("flatlinks");
 247         HideULines = security->getBool("hideulines");
 248         HideSplits = security->getBool("hidesplits");
 249         AnnounceTSChange = options->getBool("announcets");
 250         AllowOptCommon = options->getBool("allowmismatch");
 251         quiet_bursts = ServerInstance->Config->ConfValue("performance")->getBool("quietbursts");
 252         PingWarnTime = options->getDuration("pingwarning", 15);
 253         PingFreq = options->getDuration("serverpingfreq", 60, 1);
 254
 255         if (PingWarnTime >= PingFreq)
 256                 PingWarnTime = 0;
 257
 258         AutoconnectBlocks.clear();
 259         LinkBlocks.clear();
 260         ConfigTagList tags = ServerInstance->Config->ConfTags("link");
 261         for(ConfigIter i = tags.first; i != tags.second; ++i)
 262         {
 263                 ConfigTag* tag = i->second;
 264                 reference<Link> L = new Link(tag);
 265
 266                 irc::spacesepstream sep = tag->getString("allowmask");
 267                 for (std::string s; sep.GetToken(s);)
 268                         L->AllowMasks.push_back(s);
 269
 270                 L->Name = tag->getString("name");
 271                 L->IPAddr = tag->getString("ipaddr");
 272                 L->Port = tag->getUInt("port", 0);
 273                 L->SendPass = tag->getString("sendpass", tag->getString("password"));
 274                 L->RecvPass = tag->getString("recvpass", tag->getString("password"));
 275                 L->Fingerprint = tag->getString("fingerprint");
 276                 L->HiddenFromStats = tag->getBool("statshidden");
 277                 L->Timeout = tag->getDuration("timeout", 30);
 278                 L->Hook = tag->getString("sslprofile", tag->getString("ssl"));
 279                 L->Bind = tag->getString("bind");
 280                 L->Hidden = tag->getBool("hidden");
 281
 282                 if (L->Name.empty())
 283                         throw ModuleException("Invalid configuration, found a link tag without a name!" + (!L->IPAddr.empty() ? " IP address: "+L->IPAddr : ""));
 284
 285                 if (L->Name.find('.') == std::string::npos)
 286                         throw ModuleException("The link name '"+L->Name+"' is invalid as it must contain at least one '.' character");
 287
 288                 if (L->Name.length() > ServerInstance->Config->Limits.MaxHost)
 289                         throw ModuleException("The link name '"+L->Name+"' is invalid as it is longer than " + ConvToStr(ServerInstance->Config->Limits.MaxHost) + " characters");
 290
 291                 if (L->RecvPass.empty())
 292                         throw ModuleException("Invalid configuration for server '"+L->Name+"', recvpass not defined");
 293
 294                 if (L->SendPass.empty())
 295                         throw ModuleException("Invalid configuration for server '"+L->Name+"', sendpass not defined");
 296
 297                 if ((L->SendPass.find(' ') != std::string::npos) || (L->RecvPass.find(' ') != std::string::npos))
 298                         throw ModuleException("Link block '" + L->Name + "' has a password set that contains a space character which is invalid");
 299
 300                 if ((L->SendPass[0] == ':') || (L->RecvPass[0] == ':'))
 301                         throw ModuleException("Link block '" + L->Name + "' has a password set that begins with a colon (:) which is invalid");
 302
 303                 if (L->IPAddr.empty())
 304                 {
 305                         L->IPAddr = "*";
 306                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Configuration warning: Link block '" + L->Name + "' has no IP defined! This will allow any IP to connect as this server, and MAY not be what you want.");
 307                 }
 308
 309                 if (!L->Port && L->IPAddr.find('/') == std::string::npos)
 310                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Configuration warning: Link block '" + L->Name + "' has no port defined, you will not be able to /connect it.");
 311
 312                 L->Fingerprint.erase(std::remove(L->Fingerprint.begin(), L->Fingerprint.end(), ':'), L->Fingerprint.end());
 313                 LinkBlocks.push_back(L);
 314         }
 315
 316         tags = ServerInstance->Config->ConfTags("autoconnect");
 317         for(ConfigIter i = tags.first; i != tags.second; ++i)
 318         {
 319                 ConfigTag* tag = i->second;
 320                 reference<Autoconnect> A = new Autoconnect(tag);
 321                 A->Period = tag->getDuration("period", 60, 1);
 322                 A->NextConnectTime = ServerInstance->Time() + A->Period;
 323                 A->position = -1;
 324                 irc::spacesepstream ss(tag->getString("server"));
 325                 std::string server;
 326                 while (ss.GetToken(server))
 327                 {
 328                         A->servers.push_back(server);
 329                 }
 330
 331                 if (A->servers.empty())
 332                 {
 333                         throw ModuleException("Invalid configuration for autoconnect, server cannot be empty!");
 334                 }
 335
 336                 AutoconnectBlocks.push_back(A);
 337         }
 338
 339         for (server_hash::const_iterator i = serverlist.begin(); i != serverlist.end(); ++i)
 340                 i->second->CheckULine();
 341
 342         RefreshIPCache();
 343 }
 344
 345 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 346 {
 347         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 348         {
 349                 Link* x = *i;
 350                 if (InspIRCd::Match(x->Name, name, ascii_case_insensitive_map))
 351                 {
 352                         return x;
 353                 }
 354         }
 355         return NULL;
 356 }
 357
 358 void SpanningTreeUtilities::SendChannelMessage(User* source, Channel* target, const std::string& text, char status, const ClientProtocol::TagMap& tags, const CUList& exempt_list, const char* message_type, TreeSocket* omit)
 359 {
 360         CmdBuilder msg(source, message_type);
 361         msg.push_tags(tags);
 362         msg.push_raw(' ');
 363         if (status != 0)
 364                 msg.push_raw(status);
 365         msg.push_raw(target->name);
 366         if (!text.empty())
 367                 msg.push_last(text);
 368
 369         TreeSocketSet list;
 370         this->GetListOfServersForChannel(target, list, status, exempt_list);
 371         for (TreeSocketSet::iterator i = list.begin(); i != list.end(); ++i)
 372         {
 373                 TreeSocket* Sock = *i;
 374                 if (Sock != omit)
 375                         Sock->WriteLine(msg);
 376         }
 377 }
 378
 379 void SpanningTreeUtilities::SendListLimits(Channel* chan, TreeSocket* sock)
 380 {
 381         std::stringstream buffer;
 382         const ModeParser::ListModeList& listmodes = ServerInstance->Modes->GetListModes();
 383         for (ModeParser::ListModeList::const_iterator i = listmodes.begin(); i != listmodes.end(); ++i)
 384         {
 385                 ListModeBase* lm = *i;
 386                 buffer << lm->GetModeChar() << " " << lm->GetLimit(chan) << " ";
 387         }
 388
 389         std::string bufferstr = buffer.str();
 390         if (bufferstr.empty())
 391                 return; // Should never happen.
 392
 393         bufferstr.erase(bufferstr.end() - 1);
 394         if (sock)
 395                 sock->WriteLine(CommandMetadata::Builder(chan, "maxlist", bufferstr));
 396         else
 397                 CommandMetadata::Builder(chan, "maxlist", bufferstr).Broadcast();
 398 }