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