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