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 #include "modules/server.h"
  32
  33 SpanningTreeUtilities* Utils = NULL;
  34
  35 ModResult ModuleSpanningTree::OnAcceptConnection(int newsock, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  36 {
  37         if (!stdalgo::string::equalsci(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 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  56 {
  57         if (InspIRCd::IsSID(ServerName))
  58                 return this->FindServerID(ServerName);
  59
  60         server_hash::iterator iter = serverlist.find(ServerName);
  61         if (iter != serverlist.end())
  62         {
  63                 return iter->second;
  64         }
  65         else
  66         {
  67                 return NULL;
  68         }
  69 }
  70
  71 /** Find the first server matching a given glob mask.
  72  * We iterate over the list and match each one until we get a hit.
  73  */
  74 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
  75 {
  76         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
  77         {
  78                 if (InspIRCd::Match(i->first,ServerName))
  79                         return i->second;
  80         }
  81         return NULL;
  82 }
  83
  84 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
  85 {
  86         server_hash::iterator iter = sidlist.find(id);
  87         if (iter != sidlist.end())
  88                 return iter->second;
  89         else
  90                 return NULL;
  91 }
  92
  93 TreeServer* SpanningTreeUtilities::FindRouteTarget(const std::string& target)
  94 {
  95         TreeServer* const server = FindServer(target);
  96         if (server)
  97                 return server;
  98
  99         User* const user = ServerInstance->FindNick(target);
 100         if (user)
 101                 return TreeServer::Get(user);
 102
 103         return NULL;
 104 }
 105
 106 SpanningTreeUtilities::SpanningTreeUtilities(ModuleSpanningTree* C)
 107         : Creator(C), TreeRoot(NULL)
 108         , 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
 109 {
 110         ServerInstance->Timers.AddTimer(&RefreshTimer);
 111 }
 112
 113 CullResult SpanningTreeUtilities::cull()
 114 {
 115         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 116         while (!children.empty())
 117         {
 118                 TreeSocket* sock = children.front()->GetSocket();
 119                 sock->Close();
 120         }
 121
 122         for(TimeoutList::iterator i = timeoutlist.begin(); i != timeoutlist.end(); ++i)
 123         {
 124                 TreeSocket* s = i->first;
 125                 s->Close();
 126         }
 127         TreeRoot->cull();
 128
 129         return classbase::cull();
 130 }
 131
 132 SpanningTreeUtilities::~SpanningTreeUtilities()
 133 {
 134         delete TreeRoot;
 135 }
 136
 137 // Returns a list of DIRECT servers for a specific channel
 138 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeSocketSet& list, char status, const CUList& exempt_list)
 139 {
 140         unsigned int minrank = 0;
 141         if (status)
 142         {
 143                 PrefixMode* mh = ServerInstance->Modes->FindPrefix(status);
 144                 if (mh)
 145                         minrank = mh->GetPrefixRank();
 146         }
 147
 148         TreeServer::ChildServers children = TreeRoot->GetChildren();
 149         const Channel::MemberMap& ulist = c->GetUsers();
 150         for (Channel::MemberMap::const_iterator i = ulist.begin(); i != ulist.end(); ++i)
 151         {
 152                 if (IS_LOCAL(i->first))
 153                         continue;
 154
 155                 if (minrank && i->second->getRank() < minrank)
 156                         continue;
 157
 158                 if (exempt_list.find(i->first) == exempt_list.end())
 159                 {
 160                         TreeServer* best = TreeServer::Get(i->first);
 161                         list.insert(best->GetSocket());
 162
 163                         TreeServer::ChildServers::iterator citer = std::find(children.begin(), children.end(), best);
 164                         if (citer != children.end())
 165                                 children.erase(citer);
 166                 }
 167         }
 168
 169         // Check whether the servers which do not have users in the channel might need this message. This
 170         // is used to keep the chanhistory module synchronised between servers.
 171         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 172         {
 173                 ModResult result;
 174                 FIRST_MOD_RESULT_CUSTOM(Creator->GetEventProvider(), ServerEventListener, OnBroadcastMessage, result, (c, *i));
 175                 if (result == MOD_RES_ALLOW)
 176                         list.insert((*i)->GetSocket());
 177         }
 178 }
 179
 180 void SpanningTreeUtilities::DoOneToAllButSender(const CmdBuilder& params, TreeServer* omitroute)
 181 {
 182         const std::string& FullLine = params.str();
 183
 184         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 185         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 186         {
 187                 TreeServer* Route = *i;
 188                 // Send the line if the route isn't the path to the one to be omitted
 189                 if (Route != omitroute)
 190                 {
 191                         Route->GetSocket()->WriteLine(FullLine);
 192                 }
 193         }
 194 }
 195
 196 void SpanningTreeUtilities::DoOneToOne(const CmdBuilder& params, Server* server)
 197 {
 198         TreeServer* ts = static_cast<TreeServer*>(server);
 199         TreeSocket* sock = ts->GetSocket();
 200         if (sock)
 201                 sock->WriteLine(params);
 202 }
 203
 204 void SpanningTreeUtilities::RefreshIPCache()
 205 {
 206         ValidIPs.clear();
 207         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 208         {
 209                 Link* L = *i;
 210                 if (!L->Port)
 211                 {
 212                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring a link block without a port.");
 213                         /* Invalid link block */
 214                         continue;
 215                 }
 216
 217                 ValidIPs.insert(ValidIPs.end(), L->AllowMasks.begin(), L->AllowMasks.end());
 218
 219                 irc::sockets::sockaddrs dummy;
 220                 bool ipvalid = irc::sockets::aptosa(L->IPAddr, L->Port, dummy);
 221                 if ((L->IPAddr == "*") || (ipvalid))
 222                         ValidIPs.push_back(L->IPAddr);
 223                 else if (this->Creator->DNS)
 224                 {
 225                         SecurityIPResolver* sr = new SecurityIPResolver(Creator, *this->Creator->DNS, L->IPAddr, L, DNS::QUERY_AAAA);
 226                         try
 227                         {
 228                                 this->Creator->DNS->Process(sr);
 229                         }
 230                         catch (DNS::Exception &)
 231                         {
 232                                 delete sr;
 233                         }
 234                 }
 235         }
 236 }
 237
 238 void SpanningTreeUtilities::ReadConfiguration()
 239 {
 240         ConfigTag* security = ServerInstance->Config->ConfValue("security");
 241         ConfigTag* options = ServerInstance->Config->ConfValue("options");
 242         FlatLinks = security->getBool("flatlinks");
 243         HideULines = security->getBool("hideulines");
 244         HideSplits = security->getBool("hidesplits");
 245         AnnounceTSChange = options->getBool("announcets");
 246         AllowOptCommon = options->getBool("allowmismatch");
 247         quiet_bursts = ServerInstance->Config->ConfValue("performance")->getBool("quietbursts");
 248         PingWarnTime = options->getDuration("pingwarning", 15);
 249         PingFreq = options->getDuration("serverpingfreq", 60, 1);
 250
 251         if (PingWarnTime >= PingFreq)
 252                 PingWarnTime = 0;
 253
 254         AutoconnectBlocks.clear();
 255         LinkBlocks.clear();
 256         ConfigTagList tags = ServerInstance->Config->ConfTags("link");
 257         for(ConfigIter i = tags.first; i != tags.second; ++i)
 258         {
 259                 ConfigTag* tag = i->second;
 260                 reference<Link> L = new Link(tag);
 261
 262                 irc::spacesepstream sep = tag->getString("allowmask");
 263                 for (std::string s; sep.GetToken(s);)
 264                         L->AllowMasks.push_back(s);
 265
 266                 L->Name = tag->getString("name");
 267                 L->IPAddr = tag->getString("ipaddr");
 268                 L->Port = tag->getUInt("port", 0);
 269                 L->SendPass = tag->getString("sendpass", tag->getString("password"));
 270                 L->RecvPass = tag->getString("recvpass", tag->getString("password"));
 271                 L->Fingerprint = tag->getString("fingerprint");
 272                 L->HiddenFromStats = tag->getBool("statshidden");
 273                 L->Timeout = tag->getDuration("timeout", 30);
 274                 L->Hook = tag->getString("ssl");
 275                 L->Bind = tag->getString("bind");
 276                 L->Hidden = tag->getBool("hidden");
 277
 278                 if (L->Name.empty())
 279                         throw ModuleException("Invalid configuration, found a link tag without a name!" + (!L->IPAddr.empty() ? " IP address: "+L->IPAddr : ""));
 280
 281                 if (L->Name.find('.') == std::string::npos)
 282                         throw ModuleException("The link name '"+L->Name+"' is invalid as it must contain at least one '.' character");
 283
 284                 if (L->Name.length() > ServerInstance->Config->Limits.MaxHost)
 285                         throw ModuleException("The link name '"+L->Name+"' is invalid as it is longer than " + ConvToStr(ServerInstance->Config->Limits.MaxHost) + " characters");
 286
 287                 if (L->RecvPass.empty())
 288                         throw ModuleException("Invalid configuration for server '"+L->Name+"', recvpass not defined");
 289
 290                 if (L->SendPass.empty())
 291                         throw ModuleException("Invalid configuration for server '"+L->Name+"', sendpass not defined");
 292
 293                 if ((L->SendPass.find(' ') != std::string::npos) || (L->RecvPass.find(' ') != std::string::npos))
 294                         throw ModuleException("Link block '" + L->Name + "' has a password set that contains a space character which is invalid");
 295
 296                 if ((L->SendPass[0] == ':') || (L->RecvPass[0] == ':'))
 297                         throw ModuleException("Link block '" + L->Name + "' has a password set that begins with a colon (:) which is invalid");
 298
 299                 if (L->IPAddr.empty())
 300                 {
 301                         L->IPAddr = "*";
 302                         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.");
 303                 }
 304
 305                 if (!L->Port && L->IPAddr.find('/') == std::string::npos)
 306                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Configuration warning: Link block '" + L->Name + "' has no port defined, you will not be able to /connect it.");
 307
 308                 L->Fingerprint.erase(std::remove(L->Fingerprint.begin(), L->Fingerprint.end(), ':'), L->Fingerprint.end());
 309                 LinkBlocks.push_back(L);
 310         }
 311
 312         tags = ServerInstance->Config->ConfTags("autoconnect");
 313         for(ConfigIter i = tags.first; i != tags.second; ++i)
 314         {
 315                 ConfigTag* tag = i->second;
 316                 reference<Autoconnect> A = new Autoconnect(tag);
 317                 A->Period = tag->getDuration("period", 60, 1);
 318                 A->NextConnectTime = ServerInstance->Time() + A->Period;
 319                 A->position = -1;
 320                 irc::spacesepstream ss(tag->getString("server"));
 321                 std::string server;
 322                 while (ss.GetToken(server))
 323                 {
 324                         A->servers.push_back(server);
 325                 }
 326
 327                 if (A->servers.empty())
 328                 {
 329                         throw ModuleException("Invalid configuration for autoconnect, server cannot be empty!");
 330                 }
 331
 332                 AutoconnectBlocks.push_back(A);
 333         }
 334
 335         for (server_hash::const_iterator i = serverlist.begin(); i != serverlist.end(); ++i)
 336                 i->second->CheckULine();
 337
 338         RefreshIPCache();
 339 }
 340
 341 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 342 {
 343         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 344         {
 345                 Link* x = *i;
 346                 if (InspIRCd::Match(x->Name, name, ascii_case_insensitive_map))
 347                 {
 348                         return x;
 349                 }
 350         }
 351         return NULL;
 352 }
 353
 354 void SpanningTreeUtilities::SendChannelMessage(const std::string& prefix, Channel* target, const std::string& text, char status, const ClientProtocol::TagMap& tags, const CUList& exempt_list, const char* message_type, TreeSocket* omit)
 355 {
 356         CmdBuilder msg(prefix, message_type);
 357         msg.push_tags(tags);
 358         msg.push_raw(' ');
 359         if (status != 0)
 360                 msg.push_raw(status);
 361         msg.push_raw(target->name);
 362         if (!text.empty())
 363                 msg.push_last(text);
 364
 365         TreeSocketSet list;
 366         this->GetListOfServersForChannel(target, list, status, exempt_list);
 367         for (TreeSocketSet::iterator i = list.begin(); i != list.end(); ++i)
 368         {
 369                 TreeSocket* Sock = *i;
 370                 if (Sock != omit)
 371                         Sock->WriteLine(msg);
 372         }
 373 }