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 TreeServer* SpanningTreeUtilities::FindRouteTarget(const std::string& target)
  93 {
  94         TreeServer* const server = FindServer(target);
  95         if (server)
  96                 return server;
  97
  98         User* const user = ServerInstance->FindNick(target);
  99         if (user)
 100                 return TreeServer::Get(user);
 101
 102         return NULL;
 103 }
 104
 105 SpanningTreeUtilities::SpanningTreeUtilities(ModuleSpanningTree* C)
 106         : Creator(C), TreeRoot(NULL)
 107         , 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
 108 {
 109         ServerInstance->Timers.AddTimer(&RefreshTimer);
 110 }
 111
 112 CullResult SpanningTreeUtilities::cull()
 113 {
 114         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 115         while (!children.empty())
 116         {
 117                 TreeSocket* sock = children.front()->GetSocket();
 118                 sock->Close();
 119         }
 120
 121         for(TimeoutList::iterator i = timeoutlist.begin(); i != timeoutlist.end(); ++i)
 122         {
 123                 TreeSocket* s = i->first;
 124                 s->Close();
 125         }
 126         TreeRoot->cull();
 127
 128         return classbase::cull();
 129 }
 130
 131 SpanningTreeUtilities::~SpanningTreeUtilities()
 132 {
 133         delete TreeRoot;
 134 }
 135
 136 // Returns a list of DIRECT servers for a specific channel
 137 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeSocketSet& list, char status, const CUList& exempt_list)
 138 {
 139         unsigned int minrank = 0;
 140         if (status)
 141         {
 142                 PrefixMode* mh = ServerInstance->Modes->FindPrefix(status);
 143                 if (mh)
 144                         minrank = mh->GetPrefixRank();
 145         }
 146
 147         const Channel::MemberMap& ulist = c->GetUsers();
 148         for (Channel::MemberMap::const_iterator i = ulist.begin(); i != ulist.end(); ++i)
 149         {
 150                 if (IS_LOCAL(i->first))
 151                         continue;
 152
 153                 if (minrank && i->second->getRank() < minrank)
 154                         continue;
 155
 156                 if (exempt_list.find(i->first) == exempt_list.end())
 157                 {
 158                         TreeServer* best = TreeServer::Get(i->first);
 159                         list.insert(best->GetSocket());
 160                 }
 161         }
 162         return;
 163 }
 164
 165 void SpanningTreeUtilities::DoOneToAllButSender(const CmdBuilder& params, TreeServer* omitroute)
 166 {
 167         const std::string& FullLine = params.str();
 168
 169         const TreeServer::ChildServers& children = TreeRoot->GetChildren();
 170         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 171         {
 172                 TreeServer* Route = *i;
 173                 // Send the line if the route isn't the path to the one to be omitted
 174                 if (Route != omitroute)
 175                 {
 176                         Route->GetSocket()->WriteLine(FullLine);
 177                 }
 178         }
 179 }
 180
 181 void SpanningTreeUtilities::DoOneToOne(const CmdBuilder& params, Server* server)
 182 {
 183         TreeServer* ts = static_cast<TreeServer*>(server);
 184         TreeSocket* sock = ts->GetSocket();
 185         if (sock)
 186                 sock->WriteLine(params);
 187 }
 188
 189 void SpanningTreeUtilities::RefreshIPCache()
 190 {
 191         ValidIPs.clear();
 192         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 193         {
 194                 Link* L = *i;
 195                 if (!L->Port)
 196                 {
 197                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring a link block without a port.");
 198                         /* Invalid link block */
 199                         continue;
 200                 }
 201
 202                 ValidIPs.insert(ValidIPs.end(), L->AllowMasks.begin(), L->AllowMasks.end());
 203
 204                 irc::sockets::sockaddrs dummy;
 205                 bool ipvalid = irc::sockets::aptosa(L->IPAddr, L->Port, dummy);
 206                 if ((L->IPAddr == "*") || (ipvalid))
 207                         ValidIPs.push_back(L->IPAddr);
 208                 else if (this->Creator->DNS)
 209                 {
 210                         SecurityIPResolver* sr = new SecurityIPResolver(Creator, *this->Creator->DNS, L->IPAddr, L, DNS::QUERY_AAAA);
 211                         try
 212                         {
 213                                 this->Creator->DNS->Process(sr);
 214                         }
 215                         catch (DNS::Exception &)
 216                         {
 217                                 delete sr;
 218                         }
 219                 }
 220         }
 221 }
 222
 223 void SpanningTreeUtilities::ReadConfiguration()
 224 {
 225         ConfigTag* security = ServerInstance->Config->ConfValue("security");
 226         ConfigTag* options = ServerInstance->Config->ConfValue("options");
 227         FlatLinks = security->getBool("flatlinks");
 228         HideULines = security->getBool("hideulines");
 229         AnnounceTSChange = options->getBool("announcets");
 230         AllowOptCommon = options->getBool("allowmismatch");
 231         quiet_bursts = ServerInstance->Config->ConfValue("performance")->getBool("quietbursts");
 232         PingWarnTime = options->getDuration("pingwarning", 15);
 233         PingFreq = options->getDuration("serverpingfreq", 60, 1);
 234
 235         if (PingWarnTime >= PingFreq)
 236                 PingWarnTime = 0;
 237
 238         AutoconnectBlocks.clear();
 239         LinkBlocks.clear();
 240         ConfigTagList tags = ServerInstance->Config->ConfTags("link");
 241         for(ConfigIter i = tags.first; i != tags.second; ++i)
 242         {
 243                 ConfigTag* tag = i->second;
 244                 reference<Link> L = new Link(tag);
 245                 std::string linkname = tag->getString("name");
 246                 L->Name = linkname.c_str();
 247
 248                 irc::spacesepstream sep = tag->getString("allowmask");
 249                 for (std::string s; sep.GetToken(s);)
 250                         L->AllowMasks.push_back(s);
 251
 252                 L->IPAddr = tag->getString("ipaddr");
 253                 L->Port = tag->getUInt("port", 0);
 254                 L->SendPass = tag->getString("sendpass", tag->getString("password"));
 255                 L->RecvPass = tag->getString("recvpass", tag->getString("password"));
 256                 L->Fingerprint = tag->getString("fingerprint");
 257                 L->HiddenFromStats = tag->getBool("statshidden");
 258                 L->Timeout = tag->getDuration("timeout", 30);
 259                 L->Hook = tag->getString("ssl");
 260                 L->Bind = tag->getString("bind");
 261                 L->Hidden = tag->getBool("hidden");
 262
 263                 if (L->Name.empty())
 264                         throw ModuleException("Invalid configuration, found a link tag without a name!" + (!L->IPAddr.empty() ? " IP address: "+L->IPAddr : ""));
 265
 266                 if (L->Name.find('.') == std::string::npos)
 267                         throw ModuleException("The link name '"+L->Name+"' is invalid as it must contain at least one '.' character");
 268
 269                 if (L->Name.length() > ServerInstance->Config->Limits.MaxHost)
 270                         throw ModuleException("The link name '"+L->Name+"' is invalid as it is longer than " + ConvToStr(ServerInstance->Config->Limits.MaxHost) + " characters");
 271
 272                 if (L->RecvPass.empty())
 273                         throw ModuleException("Invalid configuration for server '"+L->Name+"', recvpass not defined");
 274
 275                 if (L->SendPass.empty())
 276                         throw ModuleException("Invalid configuration for server '"+L->Name+"', sendpass not defined");
 277
 278                 if ((L->SendPass.find(' ') != std::string::npos) || (L->RecvPass.find(' ') != std::string::npos))
 279                         throw ModuleException("Link block '" + L->Name + "' has a password set that contains a space character which is invalid");
 280
 281                 if ((L->SendPass[0] == ':') || (L->RecvPass[0] == ':'))
 282                         throw ModuleException("Link block '" + L->Name + "' has a password set that begins with a colon (:) which is invalid");
 283
 284                 if (L->IPAddr.empty())
 285                 {
 286                         L->IPAddr = "*";
 287                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Configuration warning: Link block '" + L->Name + "' has no IP defined! This will allow any IP to connect as this server, and MAY not be what you want.");
 288                 }
 289
 290                 if (!L->Port)
 291                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Configuration warning: Link block '" + L->Name + "' has no port defined, you will not be able to /connect it.");
 292
 293                 L->Fingerprint.erase(std::remove(L->Fingerprint.begin(), L->Fingerprint.end(), ':'), L->Fingerprint.end());
 294                 LinkBlocks.push_back(L);
 295         }
 296
 297         tags = ServerInstance->Config->ConfTags("autoconnect");
 298         for(ConfigIter i = tags.first; i != tags.second; ++i)
 299         {
 300                 ConfigTag* tag = i->second;
 301                 reference<Autoconnect> A = new Autoconnect(tag);
 302                 A->Period = tag->getDuration("period", 60, 1);
 303                 A->NextConnectTime = ServerInstance->Time() + A->Period;
 304                 A->position = -1;
 305                 irc::spacesepstream ss(tag->getString("server"));
 306                 std::string server;
 307                 while (ss.GetToken(server))
 308                 {
 309                         A->servers.push_back(server);
 310                 }
 311
 312                 if (A->servers.empty())
 313                 {
 314                         throw ModuleException("Invalid configuration for autoconnect, server cannot be empty!");
 315                 }
 316
 317                 AutoconnectBlocks.push_back(A);
 318         }
 319
 320         for (server_hash::const_iterator i = serverlist.begin(); i != serverlist.end(); ++i)
 321                 i->second->CheckULine();
 322
 323         RefreshIPCache();
 324 }
 325
 326 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 327 {
 328         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 329         {
 330                 Link* x = *i;
 331                 if (InspIRCd::Match(x->Name, name, ascii_case_insensitive_map))
 332                 {
 333                         return x;
 334                 }
 335         }
 336         return NULL;
 337 }
 338
 339 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)
 340 {
 341         CmdBuilder msg(prefix, message_type);
 342         msg.push_raw(' ');
 343         if (status != 0)
 344                 msg.push_raw(status);
 345         msg.push_raw(target->name).push_last(text);
 346
 347         TreeSocketSet list;
 348         this->GetListOfServersForChannel(target, list, status, exempt_list);
 349         for (TreeSocketSet::iterator i = list.begin(); i != list.end(); ++i)
 350         {
 351                 TreeSocket* Sock = *i;
 352                 if (Sock != omit)
 353                         Sock->WriteLine(msg);
 354         }
 355 }