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                         return TreeServer::Get(u)->GetRoute();
  97                 }
  98
  99                 return NULL;
 100         }
 101 }
 102
 103 /** Find the first server matching a given glob mask.
 104  * Theres no find-using-glob method of hash_map [awwww :-(]
 105  * so instead, we iterate over the list using an iterator
 106  * and match each one until we get a hit. Yes its slow,
 107  * deal with it.
 108  */
 109 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 110 {
 111         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 112         {
 113                 if (InspIRCd::Match(i->first,ServerName))
 114                         return i->second;
 115         }
 116         return NULL;
 117 }
 118
 119 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 120 {
 121         server_hash::iterator iter = sidlist.find(id);
 122         if (iter != sidlist.end())
 123                 return iter->second;
 124         else
 125                 return NULL;
 126 }
 127
 128 SpanningTreeUtilities::SpanningTreeUtilities(ModuleSpanningTree* C)
 129         : Creator(C), TreeRoot(NULL)
 130 {
 131         ServerInstance->Timers.AddTimer(&RefreshTimer);
 132 }
 133
 134 CullResult SpanningTreeUtilities::cull()
 135 {
 136         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 137         while (!children.empty())
 138         {
 139                 TreeSocket* sock = children.front()->GetSocket();
 140                 sock->Close();
 141         }
 142
 143         for(std::map<TreeSocket*, std::pair<std::string, int> >::iterator i = timeoutlist.begin(); i != timeoutlist.end(); ++i)
 144         {
 145                 TreeSocket* s = i->first;
 146                 s->Close();
 147         }
 148         TreeRoot->cull();
 149
 150         return classbase::cull();
 151 }
 152
 153 SpanningTreeUtilities::~SpanningTreeUtilities()
 154 {
 155         delete TreeRoot;
 156 }
 157
 158 /* returns a list of DIRECT servernames for a specific channel */
 159 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeSocketSet& list, char status, const CUList& exempt_list)
 160 {
 161         unsigned int minrank = 0;
 162         if (status)
 163         {
 164                 PrefixMode* mh = ServerInstance->Modes->FindPrefix(status);
 165                 if (mh)
 166                         minrank = mh->GetPrefixRank();
 167         }
 168
 169         const UserMembList *ulist = c->GetUsers();
 170
 171         for (UserMembCIter i = ulist->begin(); i != ulist->end(); i++)
 172         {
 173                 if (IS_LOCAL(i->first))
 174                         continue;
 175
 176                 if (minrank && i->second->getRank() < minrank)
 177                         continue;
 178
 179                 if (exempt_list.find(i->first) == exempt_list.end())
 180                 {
 181                         TreeServer* best = TreeServer::Get(i->first);
 182                         list.insert(best->GetSocket());
 183                 }
 184         }
 185         return;
 186 }
 187
 188 void SpanningTreeUtilities::DoOneToAllButSender(const CmdBuilder& params, TreeServer* omitroute)
 189 {
 190         const std::string& FullLine = params.str();
 191
 192         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 193         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 194         {
 195                 TreeServer* Route = *i;
 196                 // Send the line if the route isn't the path to the one to be omitted
 197                 if (Route != omitroute)
 198                 {
 199                         Route->GetSocket()->WriteLine(FullLine);
 200                 }
 201         }
 202 }
 203
 204 bool SpanningTreeUtilities::DoOneToOne(const CmdBuilder& params, const std::string& target)
 205 {
 206         TreeServer* Route = this->BestRouteTo(target);
 207         if (!Route)
 208                 return false;
 209
 210         DoOneToOne(params, Route);
 211         return true;
 212 }
 213
 214 void SpanningTreeUtilities::DoOneToOne(const CmdBuilder& params, Server* server)
 215 {
 216         TreeServer* ts = static_cast<TreeServer*>(server);
 217         ts->GetSocket()->WriteLine(params);
 218 }
 219
 220 void SpanningTreeUtilities::RefreshIPCache()
 221 {
 222         ValidIPs.clear();
 223         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 224         {
 225                 Link* L = *i;
 226                 if (!L->Port)
 227                 {
 228                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring a link block without a port.");
 229                         /* Invalid link block */
 230                         continue;
 231                 }
 232
 233                 ValidIPs.insert(ValidIPs.end(), L->AllowMasks.begin(), L->AllowMasks.end());
 234
 235                 irc::sockets::sockaddrs dummy;
 236                 bool ipvalid = irc::sockets::aptosa(L->IPAddr, L->Port, dummy);
 237                 if ((L->IPAddr == "*") || (ipvalid))
 238                         ValidIPs.push_back(L->IPAddr);
 239                 else if (this->Creator->DNS)
 240                 {
 241                         SecurityIPResolver* sr = new SecurityIPResolver(Creator, *this->Creator->DNS, L->IPAddr, L, DNS::QUERY_AAAA);
 242                         try
 243                         {
 244                                 this->Creator->DNS->Process(sr);
 245                         }
 246                         catch (DNS::Exception &)
 247                         {
 248                                 delete sr;
 249                         }
 250                 }
 251         }
 252 }
 253
 254 void SpanningTreeUtilities::ReadConfiguration()
 255 {
 256         ConfigTag* security = ServerInstance->Config->ConfValue("security");
 257         ConfigTag* options = ServerInstance->Config->ConfValue("options");
 258         FlatLinks = security->getBool("flatlinks");
 259         HideULines = security->getBool("hideulines");
 260         AnnounceTSChange = options->getBool("announcets");
 261         AllowOptCommon = options->getBool("allowmismatch");
 262         ChallengeResponse = !security->getBool("disablehmac");
 263         quiet_bursts = ServerInstance->Config->ConfValue("performance")->getBool("quietbursts");
 264         PingWarnTime = options->getInt("pingwarning");
 265         PingFreq = options->getInt("serverpingfreq");
 266
 267         if (PingFreq == 0)
 268                 PingFreq = 60;
 269
 270         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 271                 PingWarnTime = 0;
 272
 273         AutoconnectBlocks.clear();
 274         LinkBlocks.clear();
 275         ConfigTagList tags = ServerInstance->Config->ConfTags("link");
 276         for(ConfigIter i = tags.first; i != tags.second; ++i)
 277         {
 278                 ConfigTag* tag = i->second;
 279                 reference<Link> L = new Link(tag);
 280                 std::string linkname = tag->getString("name");
 281                 L->Name = linkname.c_str();
 282
 283                 irc::spacesepstream sep = tag->getString("allowmask");
 284                 for (std::string s; sep.GetToken(s);)
 285                         L->AllowMasks.push_back(s);
 286
 287                 L->IPAddr = tag->getString("ipaddr");
 288                 L->Port = tag->getInt("port");
 289                 L->SendPass = tag->getString("sendpass", tag->getString("password"));
 290                 L->RecvPass = tag->getString("recvpass", tag->getString("password"));
 291                 L->Fingerprint = tag->getString("fingerprint");
 292                 L->HiddenFromStats = tag->getBool("statshidden");
 293                 L->Timeout = tag->getDuration("timeout", 30);
 294                 L->Hook = tag->getString("ssl");
 295                 L->Bind = tag->getString("bind");
 296                 L->Hidden = tag->getBool("hidden");
 297
 298                 if (L->Name.empty())
 299                         throw ModuleException("Invalid configuration, found a link tag without a name!" + (!L->IPAddr.empty() ? " IP address: "+L->IPAddr : ""));
 300
 301                 if (L->Name.find('.') == std::string::npos)
 302                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it must contain at least one '.' character");
 303
 304                 if (L->Name.length() > ServerInstance->Config->Limits.MaxHost)
 305                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it is longer than " + ConvToStr(ServerInstance->Config->Limits.MaxHost) + " characters");
 306
 307                 if (L->RecvPass.empty())
 308                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', recvpass not defined");
 309
 310                 if (L->SendPass.empty())
 311                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', sendpass not defined");
 312
 313                 if ((L->SendPass.find(' ') != std::string::npos) || (L->RecvPass.find(' ') != std::string::npos))
 314                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that contains a space character which is invalid");
 315
 316                 if ((L->SendPass[0] == ':') || (L->RecvPass[0] == ':'))
 317                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that begins with a colon (:) which is invalid");
 318
 319                 if (L->IPAddr.empty())
 320                 {
 321                         L->IPAddr = "*";
 322                         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.");
 323                 }
 324
 325                 if (!L->Port)
 326                         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.");
 327
 328                 L->Fingerprint.erase(std::remove(L->Fingerprint.begin(), L->Fingerprint.end(), ':'), L->Fingerprint.end());
 329                 LinkBlocks.push_back(L);
 330         }
 331
 332         tags = ServerInstance->Config->ConfTags("autoconnect");
 333         for(ConfigIter i = tags.first; i != tags.second; ++i)
 334         {
 335                 ConfigTag* tag = i->second;
 336                 reference<Autoconnect> A = new Autoconnect(tag);
 337                 A->Period = tag->getDuration("period", 60, 1);
 338                 A->NextConnectTime = ServerInstance->Time() + A->Period;
 339                 A->position = -1;
 340                 irc::spacesepstream ss(tag->getString("server"));
 341                 std::string server;
 342                 while (ss.GetToken(server))
 343                 {
 344                         A->servers.push_back(server);
 345                 }
 346
 347                 if (A->servers.empty())
 348                 {
 349                         throw ModuleException("Invalid configuration for autoconnect, server cannot be empty!");
 350                 }
 351
 352                 AutoconnectBlocks.push_back(A);
 353         }
 354
 355         for (server_hash::const_iterator i = serverlist.begin(); i != serverlist.end(); ++i)
 356                 i->second->CheckULine();
 357
 358         RefreshIPCache();
 359 }
 360
 361 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 362 {
 363         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 364         {
 365                 Link* x = *i;
 366                 if (InspIRCd::Match(x->Name.c_str(), name.c_str(), rfc_case_insensitive_map))
 367                 {
 368                         return x;
 369                 }
 370         }
 371         return NULL;
 372 }
 373
 374 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)
 375 {
 376         CmdBuilder msg(prefix, message_type);
 377         msg.push_raw(' ');
 378         if (status != 0)
 379                 msg.push_raw(status);
 380         msg.push_raw(target->name).push_last(text);
 381
 382         TreeSocketSet list;
 383         this->GetListOfServersForChannel(target, list, status, exempt_list);
 384         for (TreeSocketSet::iterator i = list.begin(); i != list.end(); ++i)
 385         {
 386                 TreeSocket* Sock = *i;
 387                 if (Sock != omit)
 388                         Sock->WriteLine(msg);
 389         }
 390 }