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