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
  29 #include "main.h"
  30 #include "utils.h"
  31 #include "treeserver.h"
  32 #include "treesocket.h"
  33 #include "resolvers.h"
  34 #include "commandbuilder.h"
  35
  36 SpanningTreeUtilities* Utils = NULL;
  37
  38 ModResult ModuleSpanningTree::OnAcceptConnection(int newsock, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  39 {
  40         if (!stdalgo::string::equalsci(from->bind_tag->getString("type"), "servers"))
  41                 return MOD_RES_PASSTHRU;
  42
  43         std::string incomingip = client->addr();
  44
  45         for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  46         {
  47                 if (*i == "*" || *i == incomingip || irc::sockets::cidr_mask(*i).match(*client))
  48                 {
  49                         /* we don't need to do anything with the pointer, creating it stores it in the necessary places */
  50                         new TreeSocket(newsock, from, client, server);
  51                         return MOD_RES_ALLOW;
  52                 }
  53         }
  54         ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", incomingip.c_str());
  55         return MOD_RES_DENY;
  56 }
  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 /** Find the first server matching a given glob mask.
  75  * We iterate over the list and match each one until we get a hit.
  76  */
  77 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
  78 {
  79         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
  80         {
  81                 if (InspIRCd::Match(i->first,ServerName))
  82                         return i->second;
  83         }
  84         return NULL;
  85 }
  86
  87 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
  88 {
  89         server_hash::iterator iter = sidlist.find(id);
  90         if (iter != sidlist.end())
  91                 return iter->second;
  92         else
  93                 return NULL;
  94 }
  95
  96 TreeServer* SpanningTreeUtilities::FindRouteTarget(const std::string& target)
  97 {
  98         TreeServer* const server = FindServer(target);
  99         if (server)
 100                 return server;
 101
 102         User* const user = ServerInstance->FindNick(target);
 103         if (user)
 104                 return TreeServer::Get(user);
 105
 106         return NULL;
 107 }
 108
 109 SpanningTreeUtilities::SpanningTreeUtilities(ModuleSpanningTree* C)
 110         : Creator(C), TreeRoot(NULL)
 111         , 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
 112 {
 113         ServerInstance->Timers.AddTimer(&RefreshTimer);
 114 }
 115
 116 CullResult SpanningTreeUtilities::cull()
 117 {
 118         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 119         while (!children.empty())
 120         {
 121                 TreeSocket* sock = children.front()->GetSocket();
 122                 sock->Close();
 123         }
 124
 125         for(TimeoutList::iterator i = timeoutlist.begin(); i != timeoutlist.end(); ++i)
 126         {
 127                 TreeSocket* s = i->first;
 128                 s->Close();
 129         }
 130         TreeRoot->cull();
 131
 132         return classbase::cull();
 133 }
 134
 135 SpanningTreeUtilities::~SpanningTreeUtilities()
 136 {
 137         delete TreeRoot;
 138 }
 139
 140 // Returns a list of DIRECT servers for a specific channel
 141 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeSocketSet& list, char status, const CUList& exempt_list)
 142 {
 143         unsigned int minrank = 0;
 144         if (status)
 145         {
 146                 PrefixMode* mh = ServerInstance->Modes->FindPrefix(status);
 147                 if (mh)
 148                         minrank = mh->GetPrefixRank();
 149         }
 150
 151         TreeServer::ChildServers children = TreeRoot->GetChildren();
 152         const Channel::MemberMap& ulist = c->GetUsers();
 153         for (Channel::MemberMap::const_iterator i = ulist.begin(); i != ulist.end(); ++i)
 154         {
 155                 if (IS_LOCAL(i->first))
 156                         continue;
 157
 158                 if (minrank && i->second->getRank() < minrank)
 159                         continue;
 160
 161                 if (exempt_list.find(i->first) == exempt_list.end())
 162                 {
 163                         TreeServer* best = TreeServer::Get(i->first);
 164                         list.insert(best->GetSocket());
 165
 166                         TreeServer::ChildServers::iterator citer = std::find(children.begin(), children.end(), best);
 167                         if (citer != children.end())
 168                                 children.erase(citer);
 169                 }
 170         }
 171
 172         // Check whether the servers which do not have users in the channel might need this message. This
 173         // is used to keep the chanhistory module synchronised between servers.
 174         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 175         {
 176                 ModResult result;
 177                 FIRST_MOD_RESULT_CUSTOM(Creator->GetBroadcastEventProvider(), ServerProtocol::BroadcastEventListener, OnBroadcastMessage, result, (c, *i));
 178                 if (result == MOD_RES_ALLOW)
 179                         list.insert((*i)->GetSocket());
 180         }
 181 }
 182
 183 void SpanningTreeUtilities::DoOneToAllButSender(const CmdBuilder& params, TreeServer* omitroute)
 184 {
 185         const std::string& FullLine = params.str();
 186
 187         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 188         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 189         {
 190                 TreeServer* Route = *i;
 191                 // Send the line if the route isn't the path to the one to be omitted
 192                 if (Route != omitroute)
 193                 {
 194                         Route->GetSocket()->WriteLine(FullLine);
 195                 }
 196         }
 197 }
 198
 199 void SpanningTreeUtilities::DoOneToOne(const CmdBuilder& params, Server* server)
 200 {
 201         TreeServer* ts = static_cast<TreeServer*>(server);
 202         TreeSocket* sock = ts->GetSocket();
 203         if (sock)
 204                 sock->WriteLine(params);
 205 }
 206
 207 void SpanningTreeUtilities::RefreshIPCache()
 208 {
 209         ValidIPs.clear();
 210         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 211         {
 212                 Link* L = *i;
 213                 if (!L->Port)
 214                 {
 215                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring a link block without a port.");
 216                         /* Invalid link block */
 217                         continue;
 218                 }
 219
 220                 ValidIPs.insert(ValidIPs.end(), L->AllowMasks.begin(), L->AllowMasks.end());
 221
 222                 irc::sockets::sockaddrs dummy;
 223                 bool ipvalid = irc::sockets::aptosa(L->IPAddr, L->Port, dummy);
 224                 if ((L->IPAddr == "*") || (ipvalid))
 225                         ValidIPs.push_back(L->IPAddr);
 226                 else if (this->Creator->DNS)
 227                 {
 228                         SecurityIPResolver* sr = new SecurityIPResolver(Creator, *this->Creator->DNS, L->IPAddr, L, DNS::QUERY_AAAA);
 229                         try
 230                         {
 231                                 this->Creator->DNS->Process(sr);
 232                         }
 233                         catch (DNS::Exception &)
 234                         {
 235                                 delete sr;
 236                         }
 237                 }
 238         }
 239 }
 240
 241 void SpanningTreeUtilities::ReadConfiguration()
 242 {
 243         ConfigTag* security = ServerInstance->Config->ConfValue("security");
 244         ConfigTag* options = ServerInstance->Config->ConfValue("options");
 245         FlatLinks = security->getBool("flatlinks");
 246         HideULines = security->getBool("hideulines");
 247         HideSplits = security->getBool("hidesplits");
 248         AnnounceTSChange = options->getBool("announcets");
 249         AllowOptCommon = options->getBool("allowmismatch");
 250         quiet_bursts = ServerInstance->Config->ConfValue("performance")->getBool("quietbursts");
 251         PingWarnTime = options->getDuration("pingwarning", 15);
 252         PingFreq = options->getDuration("serverpingfreq", 60, 1);
 253
 254         if (PingWarnTime >= PingFreq)
 255                 PingWarnTime = 0;
 256
 257         AutoconnectBlocks.clear();
 258         LinkBlocks.clear();
 259         ConfigTagList tags = ServerInstance->Config->ConfTags("link");
 260         for(ConfigIter i = tags.first; i != tags.second; ++i)
 261         {
 262                 ConfigTag* tag = i->second;
 263                 reference<Link> L = new Link(tag);
 264
 265                 irc::spacesepstream sep = tag->getString("allowmask");
 266                 for (std::string s; sep.GetToken(s);)
 267                         L->AllowMasks.push_back(s);
 268
 269                 L->Name = tag->getString("name");
 270                 L->IPAddr = tag->getString("ipaddr");
 271                 L->Port = tag->getUInt("port", 0);
 272                 L->SendPass = tag->getString("sendpass", tag->getString("password"));
 273                 L->RecvPass = tag->getString("recvpass", tag->getString("password"));
 274                 L->Fingerprint = tag->getString("fingerprint");
 275                 L->HiddenFromStats = tag->getBool("statshidden");
 276                 L->Timeout = tag->getDuration("timeout", 30);
 277                 L->Hook = tag->getString("sslprofile", tag->getString("ssl"));
 278                 L->Bind = tag->getString("bind");
 279                 L->Hidden = tag->getBool("hidden");
 280
 281                 if (L->Name.empty())
 282                         throw ModuleException("Invalid configuration, found a link tag without a name!" + (!L->IPAddr.empty() ? " IP address: "+L->IPAddr : ""));
 283
 284                 if (L->Name.find('.') == std::string::npos)
 285                         throw ModuleException("The link name '"+L->Name+"' is invalid as it must contain at least one '.' character");
 286
 287                 if (L->Name.length() > ServerInstance->Config->Limits.MaxHost)
 288                         throw ModuleException("The link name '"+L->Name+"' is invalid as it is longer than " + ConvToStr(ServerInstance->Config->Limits.MaxHost) + " characters");
 289
 290                 if (L->RecvPass.empty())
 291                         throw ModuleException("Invalid configuration for server '"+L->Name+"', recvpass not defined");
 292
 293                 if (L->SendPass.empty())
 294                         throw ModuleException("Invalid configuration for server '"+L->Name+"', sendpass not defined");
 295
 296                 if ((L->SendPass.find(' ') != std::string::npos) || (L->RecvPass.find(' ') != std::string::npos))
 297                         throw ModuleException("Link block '" + L->Name + "' has a password set that contains a space character which is invalid");
 298
 299                 if ((L->SendPass[0] == ':') || (L->RecvPass[0] == ':'))
 300                         throw ModuleException("Link block '" + L->Name + "' has a password set that begins with a colon (:) which is invalid");
 301
 302                 if (L->IPAddr.empty())
 303                 {
 304                         L->IPAddr = "*";
 305                         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.");
 306                 }
 307
 308                 if (!L->Port && L->IPAddr.find('/') == std::string::npos)
 309                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Configuration warning: Link block '" + L->Name + "' has no port defined, you will not be able to /connect it.");
 310
 311                 L->Fingerprint.erase(std::remove(L->Fingerprint.begin(), L->Fingerprint.end(), ':'), L->Fingerprint.end());
 312                 LinkBlocks.push_back(L);
 313         }
 314
 315         tags = ServerInstance->Config->ConfTags("autoconnect");
 316         for(ConfigIter i = tags.first; i != tags.second; ++i)
 317         {
 318                 ConfigTag* tag = i->second;
 319                 reference<Autoconnect> A = new Autoconnect(tag);
 320                 A->Period = tag->getDuration("period", 60, 1);
 321                 A->NextConnectTime = ServerInstance->Time() + A->Period;
 322                 A->position = -1;
 323                 irc::spacesepstream ss(tag->getString("server"));
 324                 std::string server;
 325                 while (ss.GetToken(server))
 326                 {
 327                         A->servers.push_back(server);
 328                 }
 329
 330                 if (A->servers.empty())
 331                 {
 332                         throw ModuleException("Invalid configuration for autoconnect, server cannot be empty!");
 333                 }
 334
 335                 AutoconnectBlocks.push_back(A);
 336         }
 337
 338         for (server_hash::const_iterator i = serverlist.begin(); i != serverlist.end(); ++i)
 339                 i->second->CheckULine();
 340
 341         RefreshIPCache();
 342 }
 343
 344 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 345 {
 346         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 347         {
 348                 Link* x = *i;
 349                 if (InspIRCd::Match(x->Name, name, ascii_case_insensitive_map))
 350                 {
 351                         return x;
 352                 }
 353         }
 354         return NULL;
 355 }
 356
 357 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)
 358 {
 359         CmdBuilder msg(source, message_type);
 360         msg.push_tags(tags);
 361         msg.push_raw(' ');
 362         if (status != 0)
 363                 msg.push_raw(status);
 364         msg.push_raw(target->name);
 365         if (!text.empty())
 366                 msg.push_last(text);
 367
 368         TreeSocketSet list;
 369         this->GetListOfServersForChannel(target, list, status, exempt_list);
 370         for (TreeSocketSet::iterator i = list.begin(); i != list.end(); ++i)
 371         {
 372                 TreeSocket* Sock = *i;
 373                 if (Sock != omit)
 374                         Sock->WriteLine(msg);
 375         }
 376 }