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         , 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
 121 {
 122         ServerInstance->Timers.AddTimer(&RefreshTimer);
 123 }
 124
 125 CullResult SpanningTreeUtilities::cull()
 126 {
 127         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 128         while (!children.empty())
 129         {
 130                 TreeSocket* sock = children.front()->GetSocket();
 131                 sock->Close();
 132         }
 133
 134         for(std::map<TreeSocket*, std::pair<std::string, int> >::iterator i = timeoutlist.begin(); i != timeoutlist.end(); ++i)
 135         {
 136                 TreeSocket* s = i->first;
 137                 s->Close();
 138         }
 139         TreeRoot->cull();
 140
 141         return classbase::cull();
 142 }
 143
 144 SpanningTreeUtilities::~SpanningTreeUtilities()
 145 {
 146         delete TreeRoot;
 147 }
 148
 149 // Returns a list of DIRECT servers for a specific channel
 150 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeSocketSet& list, char status, const CUList& exempt_list)
 151 {
 152         unsigned int minrank = 0;
 153         if (status)
 154         {
 155                 PrefixMode* mh = ServerInstance->Modes->FindPrefix(status);
 156                 if (mh)
 157                         minrank = mh->GetPrefixRank();
 158         }
 159
 160         const Channel::MemberMap& ulist = c->GetUsers();
 161         for (Channel::MemberMap::const_iterator i = ulist.begin(); i != ulist.end(); ++i)
 162         {
 163                 if (IS_LOCAL(i->first))
 164                         continue;
 165
 166                 if (minrank && i->second->getRank() < minrank)
 167                         continue;
 168
 169                 if (exempt_list.find(i->first) == exempt_list.end())
 170                 {
 171                         TreeServer* best = TreeServer::Get(i->first);
 172                         list.insert(best->GetSocket());
 173                 }
 174         }
 175         return;
 176 }
 177
 178 void SpanningTreeUtilities::DoOneToAllButSender(const CmdBuilder& params, TreeServer* omitroute)
 179 {
 180         const std::string& FullLine = params.str();
 181
 182         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 183         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 184         {
 185                 TreeServer* Route = *i;
 186                 // Send the line if the route isn't the path to the one to be omitted
 187                 if (Route != omitroute)
 188                 {
 189                         Route->GetSocket()->WriteLine(FullLine);
 190                 }
 191         }
 192 }
 193
 194 bool SpanningTreeUtilities::DoOneToOne(const CmdBuilder& params, const std::string& target)
 195 {
 196         TreeServer* Route = this->BestRouteTo(target);
 197         if (!Route)
 198                 return false;
 199
 200         DoOneToOne(params, Route);
 201         return true;
 202 }
 203
 204 void SpanningTreeUtilities::DoOneToOne(const CmdBuilder& params, Server* server)
 205 {
 206         TreeServer* ts = static_cast<TreeServer*>(server);
 207         TreeSocket* sock = ts->GetSocket();
 208         if (sock)
 209                 sock->WriteLine(params);
 210 }
 211
 212 void SpanningTreeUtilities::RefreshIPCache()
 213 {
 214         ValidIPs.clear();
 215         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 216         {
 217                 Link* L = *i;
 218                 if (!L->Port)
 219                 {
 220                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring a link block without a port.");
 221                         /* Invalid link block */
 222                         continue;
 223                 }
 224
 225                 ValidIPs.insert(ValidIPs.end(), L->AllowMasks.begin(), L->AllowMasks.end());
 226
 227                 irc::sockets::sockaddrs dummy;
 228                 bool ipvalid = irc::sockets::aptosa(L->IPAddr, L->Port, dummy);
 229                 if ((L->IPAddr == "*") || (ipvalid))
 230                         ValidIPs.push_back(L->IPAddr);
 231                 else if (this->Creator->DNS)
 232                 {
 233                         SecurityIPResolver* sr = new SecurityIPResolver(Creator, *this->Creator->DNS, L->IPAddr, L, DNS::QUERY_AAAA);
 234                         try
 235                         {
 236                                 this->Creator->DNS->Process(sr);
 237                         }
 238                         catch (DNS::Exception &)
 239                         {
 240                                 delete sr;
 241                         }
 242                 }
 243         }
 244 }
 245
 246 void SpanningTreeUtilities::ReadConfiguration()
 247 {
 248         ConfigTag* security = ServerInstance->Config->ConfValue("security");
 249         ConfigTag* options = ServerInstance->Config->ConfValue("options");
 250         FlatLinks = security->getBool("flatlinks");
 251         HideULines = security->getBool("hideulines");
 252         AnnounceTSChange = options->getBool("announcets");
 253         AllowOptCommon = options->getBool("allowmismatch");
 254         quiet_bursts = ServerInstance->Config->ConfValue("performance")->getBool("quietbursts");
 255         PingWarnTime = options->getInt("pingwarning");
 256         PingFreq = options->getInt("serverpingfreq");
 257
 258         if (PingFreq == 0)
 259                 PingFreq = 60;
 260
 261         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 262                 PingWarnTime = 0;
 263
 264         AutoconnectBlocks.clear();
 265         LinkBlocks.clear();
 266         ConfigTagList tags = ServerInstance->Config->ConfTags("link");
 267         for(ConfigIter i = tags.first; i != tags.second; ++i)
 268         {
 269                 ConfigTag* tag = i->second;
 270                 reference<Link> L = new Link(tag);
 271                 std::string linkname = tag->getString("name");
 272                 L->Name = linkname.c_str();
 273
 274                 irc::spacesepstream sep = tag->getString("allowmask");
 275                 for (std::string s; sep.GetToken(s);)
 276                         L->AllowMasks.push_back(s);
 277
 278                 L->IPAddr = tag->getString("ipaddr");
 279                 L->Port = tag->getInt("port");
 280                 L->SendPass = tag->getString("sendpass", tag->getString("password"));
 281                 L->RecvPass = tag->getString("recvpass", tag->getString("password"));
 282                 L->Fingerprint = tag->getString("fingerprint");
 283                 L->HiddenFromStats = tag->getBool("statshidden");
 284                 L->Timeout = tag->getDuration("timeout", 30);
 285                 L->Hook = tag->getString("ssl");
 286                 L->Bind = tag->getString("bind");
 287                 L->Hidden = tag->getBool("hidden");
 288
 289                 if (L->Name.empty())
 290                         throw ModuleException("Invalid configuration, found a link tag without a name!" + (!L->IPAddr.empty() ? " IP address: "+L->IPAddr : ""));
 291
 292                 if (L->Name.find('.') == std::string::npos)
 293                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it must contain at least one '.' character");
 294
 295                 if (L->Name.length() > ServerInstance->Config->Limits.MaxHost)
 296                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it is longer than " + ConvToStr(ServerInstance->Config->Limits.MaxHost) + " characters");
 297
 298                 if (L->RecvPass.empty())
 299                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', recvpass not defined");
 300
 301                 if (L->SendPass.empty())
 302                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', sendpass not defined");
 303
 304                 if ((L->SendPass.find(' ') != std::string::npos) || (L->RecvPass.find(' ') != std::string::npos))
 305                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that contains a space character which is invalid");
 306
 307                 if ((L->SendPass[0] == ':') || (L->RecvPass[0] == ':'))
 308                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that begins with a colon (:) which is invalid");
 309
 310                 if (L->IPAddr.empty())
 311                 {
 312                         L->IPAddr = "*";
 313                         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.");
 314                 }
 315
 316                 if (!L->Port)
 317                         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.");
 318
 319                 L->Fingerprint.erase(std::remove(L->Fingerprint.begin(), L->Fingerprint.end(), ':'), L->Fingerprint.end());
 320                 LinkBlocks.push_back(L);
 321         }
 322
 323         tags = ServerInstance->Config->ConfTags("autoconnect");
 324         for(ConfigIter i = tags.first; i != tags.second; ++i)
 325         {
 326                 ConfigTag* tag = i->second;
 327                 reference<Autoconnect> A = new Autoconnect(tag);
 328                 A->Period = tag->getDuration("period", 60, 1);
 329                 A->NextConnectTime = ServerInstance->Time() + A->Period;
 330                 A->position = -1;
 331                 irc::spacesepstream ss(tag->getString("server"));
 332                 std::string server;
 333                 while (ss.GetToken(server))
 334                 {
 335                         A->servers.push_back(server);
 336                 }
 337
 338                 if (A->servers.empty())
 339                 {
 340                         throw ModuleException("Invalid configuration for autoconnect, server cannot be empty!");
 341                 }
 342
 343                 AutoconnectBlocks.push_back(A);
 344         }
 345
 346         for (server_hash::const_iterator i = serverlist.begin(); i != serverlist.end(); ++i)
 347                 i->second->CheckULine();
 348
 349         RefreshIPCache();
 350 }
 351
 352 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 353 {
 354         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 355         {
 356                 Link* x = *i;
 357                 if (InspIRCd::Match(x->Name.c_str(), name.c_str(), rfc_case_insensitive_map))
 358                 {
 359                         return x;
 360                 }
 361         }
 362         return NULL;
 363 }
 364
 365 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)
 366 {
 367         CmdBuilder msg(prefix, message_type);
 368         msg.push_raw(' ');
 369         if (status != 0)
 370                 msg.push_raw(status);
 371         msg.push_raw(target->name).push_last(text);
 372
 373         TreeSocketSet list;
 374         this->GetListOfServersForChannel(target, list, status, exempt_list);
 375         for (TreeSocketSet::iterator i = list.begin(); i != list.end(); ++i)
 376         {
 377                 TreeSocket* Sock = *i;
 378                 if (Sock != omit)
 379                         Sock->WriteLine(msg);
 380         }
 381 }