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 #include "socket.h"
  25 #include "xline.h"
  26 #include "socketengine.h"
  27
  28 #include "main.h"
  29 #include "utils.h"
  30 #include "treeserver.h"
  31 #include "link.h"
  32 #include "treesocket.h"
  33 #include "resolvers.h"
  34
  35 /* Create server sockets off a listener. */
  36 ModResult ModuleSpanningTree::OnAcceptConnection(int newsock, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  37 {
  38         if (from->bind_tag->getString("type") != "servers")
  39                 return MOD_RES_PASSTHRU;
  40
  41         std::string incomingip = client->addr();
  42
  43         for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  44         {
  45                 if (*i == "*" || *i == incomingip || irc::sockets::cidr_mask(*i).match(*client))
  46                 {
  47                         /* we don't need to do anything with the pointer, creating it stores it in the necessary places */
  48                         new TreeSocket(Utils, newsock, from, client, server);
  49                         return MOD_RES_ALLOW;
  50                 }
  51         }
  52         ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", incomingip.c_str());
  53         return MOD_RES_DENY;
  54 }
  55
  56 /** Yay for fast searches!
  57  * This is hundreds of times faster than recursion
  58  * or even scanning a linked list, especially when
  59  * there are more than a few servers to deal with.
  60  * (read as: lots).
  61  */
  62 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  63 {
  64         if (InspIRCd::IsSID(ServerName))
  65                 return this->FindServerID(ServerName);
  66
  67         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  68         if (iter != serverlist.end())
  69         {
  70                 return iter->second;
  71         }
  72         else
  73         {
  74                 return NULL;
  75         }
  76 }
  77
  78 /** Returns the locally connected server we must route a
  79  * message through to reach server 'ServerName'. This
  80  * only applies to one-to-one and not one-to-many routing.
  81  * See the comments for the constructor of TreeServer
  82  * for more details.
  83  */
  84 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
  85 {
  86         if (ServerName.c_str() == TreeRoot->GetName() || ServerName == ServerInstance->Config->GetSID())
  87                 return NULL;
  88         TreeServer* Found = FindServer(ServerName);
  89         if (Found)
  90         {
  91                 return Found->GetRoute();
  92         }
  93         else
  94         {
  95                 // Cheat a bit. This allows for (better) working versions of routing commands with nick based prefixes, without hassle
  96                 User *u = ServerInstance->FindNick(ServerName);
  97                 if (u)
  98                 {
  99                         Found = FindServer(u->server);
 100                         if (Found)
 101                                 return Found->GetRoute();
 102                 }
 103
 104                 return NULL;
 105         }
 106 }
 107
 108 /** Find the first server matching a given glob mask.
 109  * Theres no find-using-glob method of hash_map [awwww :-(]
 110  * so instead, we iterate over the list using an iterator
 111  * and match each one until we get a hit. Yes its slow,
 112  * deal with it.
 113  */
 114 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 115 {
 116         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 117         {
 118                 if (InspIRCd::Match(i->first,ServerName))
 119                         return i->second;
 120         }
 121         return NULL;
 122 }
 123
 124 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 125 {
 126         server_hash::iterator iter = sidlist.find(id);
 127         if (iter != sidlist.end())
 128                 return iter->second;
 129         else
 130                 return NULL;
 131 }
 132
 133 SpanningTreeUtilities::SpanningTreeUtilities(ModuleSpanningTree* C) : Creator(C)
 134 {
 135         ServerInstance->Logs->Log("m_spanningtree",LOG_DEBUG,"***** Using SID for hash: %s *****", ServerInstance->Config->GetSID().c_str());
 136
 137         this->TreeRoot = new TreeServer(this, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 138         this->ReadConfiguration();
 139 }
 140
 141 CullResult SpanningTreeUtilities::cull()
 142 {
 143         while (TreeRoot->ChildCount())
 144         {
 145                 TreeServer* child_server = TreeRoot->GetChild(0);
 146                 if (child_server)
 147                 {
 148                         TreeSocket* sock = child_server->GetSocket();
 149                         sock->Close();
 150                 }
 151         }
 152
 153         for(std::map<TreeSocket*, std::pair<std::string, int> >::iterator i = timeoutlist.begin(); i != timeoutlist.end(); ++i)
 154         {
 155                 TreeSocket* s = i->first;
 156                 s->Close();
 157         }
 158         TreeRoot->cull();
 159
 160         return classbase::cull();
 161 }
 162
 163 SpanningTreeUtilities::~SpanningTreeUtilities()
 164 {
 165         delete TreeRoot;
 166 }
 167
 168 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 169 {
 170         if (list.find(server) == list.end())
 171                 list[server] = server;
 172 }
 173
 174 /* returns a list of DIRECT servernames for a specific channel */
 175 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 176 {
 177         unsigned int minrank = 0;
 178         if (status)
 179         {
 180                 ModeHandler* mh = ServerInstance->Modes->FindPrefix(status);
 181                 if (mh)
 182                         minrank = mh->GetPrefixRank();
 183         }
 184
 185         const UserMembList *ulist = c->GetUsers();
 186
 187         for (UserMembCIter i = ulist->begin(); i != ulist->end(); i++)
 188         {
 189                 if (IS_LOCAL(i->first))
 190                         continue;
 191
 192                 if (minrank && i->second->getRank() < minrank)
 193                         continue;
 194
 195                 if (exempt_list.find(i->first) == exempt_list.end())
 196                 {
 197                         TreeServer* best = this->BestRouteTo(i->first->server);
 198                         if (best)
 199                                 AddThisServer(best,list);
 200                 }
 201         }
 202         return;
 203 }
 204
 205 std::string SpanningTreeUtilities::ConstructLine(const std::string& prefix, const std::string& command, const parameterlist& params)
 206 {
 207         std::string FullLine;
 208         FullLine.reserve(MAXBUF);
 209         FullLine = ":" + prefix + " " + command;
 210         for (parameterlist::const_iterator x = params.begin(); x != params.end(); ++x)
 211         {
 212                 FullLine.push_back(' ');
 213                 FullLine.append(*x);
 214         }
 215         return FullLine;
 216 }
 217
 218 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string& prefix, const std::string& command, const parameterlist& params, const std::string& omit)
 219 {
 220         TreeServer* omitroute = this->BestRouteTo(omit);
 221         std::string FullLine = ConstructLine(prefix, command, params);
 222
 223         unsigned int items = this->TreeRoot->ChildCount();
 224         for (unsigned int x = 0; x < items; x++)
 225         {
 226                 TreeServer* Route = this->TreeRoot->GetChild(x);
 227                 // Send the line IF:
 228                 // The route has a socket (its a direct connection)
 229                 // The route isnt the one to be omitted
 230                 // The route isnt the path to the one to be omitted
 231                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 232                 {
 233                         TreeSocket* Sock = Route->GetSocket();
 234                         if (Sock)
 235                                 Sock->WriteLine(FullLine);
 236                 }
 237         }
 238         return true;
 239 }
 240
 241 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, const parameterlist &params)
 242 {
 243         std::string FullLine = ConstructLine(prefix, command, params);
 244
 245         unsigned int items = this->TreeRoot->ChildCount();
 246         for (unsigned int x = 0; x < items; x++)
 247         {
 248                 TreeServer* Route = this->TreeRoot->GetChild(x);
 249                 if (Route && Route->GetSocket())
 250                 {
 251                         TreeSocket* Sock = Route->GetSocket();
 252                         if (Sock)
 253                                 Sock->WriteLine(FullLine);
 254                 }
 255         }
 256         return true;
 257 }
 258
 259 bool SpanningTreeUtilities::DoOneToOne(const std::string& prefix, const std::string& command, const parameterlist& params, const std::string& target)
 260 {
 261         TreeServer* Route = this->BestRouteTo(target);
 262         if (Route)
 263         {
 264                 if (Route && Route->GetSocket())
 265                 {
 266                         TreeSocket* Sock = Route->GetSocket();
 267                         if (Sock)
 268                                 Sock->WriteLine(ConstructLine(prefix, command, params));
 269                 }
 270                 return true;
 271         }
 272         else
 273         {
 274                 return false;
 275         }
 276 }
 277
 278 void SpanningTreeUtilities::RefreshIPCache()
 279 {
 280         ValidIPs.clear();
 281         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 282         {
 283                 Link* L = *i;
 284                 if (!L->Port)
 285                 {
 286                         ServerInstance->Logs->Log("m_spanningtree",LOG_DEFAULT,"m_spanningtree: Ignoring a link block without a port.");
 287                         /* Invalid link block */
 288                         continue;
 289                 }
 290
 291                 if (L->AllowMask.length())
 292                         ValidIPs.push_back(L->AllowMask);
 293
 294                 irc::sockets::sockaddrs dummy;
 295                 bool ipvalid = irc::sockets::aptosa(L->IPAddr, L->Port, dummy);
 296                 if ((L->IPAddr == "*") || (ipvalid))
 297                         ValidIPs.push_back(L->IPAddr);
 298                 else
 299                 {
 300                         try
 301                         {
 302                                 bool cached = false;
 303                                 SecurityIPResolver* sr = new SecurityIPResolver(Creator, this, L->IPAddr, L, cached, DNS_QUERY_AAAA);
 304                                 ServerInstance->AddResolver(sr, cached);
 305                         }
 306                         catch (...)
 307                         {
 308                         }
 309                 }
 310         }
 311 }
 312
 313 void SpanningTreeUtilities::ReadConfiguration()
 314 {
 315         ConfigTag* security = ServerInstance->Config->ConfValue("security");
 316         ConfigTag* options = ServerInstance->Config->ConfValue("options");
 317         FlatLinks = security->getBool("flatlinks");
 318         HideULines = security->getBool("hideulines");
 319         AnnounceTSChange = options->getBool("announcets");
 320         AllowOptCommon = options->getBool("allowmismatch");
 321         ChallengeResponse = !security->getBool("disablehmac");
 322         quiet_bursts = ServerInstance->Config->ConfValue("performance")->getBool("quietbursts");
 323         PingWarnTime = options->getInt("pingwarning");
 324         PingFreq = options->getInt("serverpingfreq");
 325
 326         if (PingFreq == 0)
 327                 PingFreq = 60;
 328
 329         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 330                 PingWarnTime = 0;
 331
 332         AutoconnectBlocks.clear();
 333         LinkBlocks.clear();
 334         ConfigTagList tags = ServerInstance->Config->ConfTags("link");
 335         for(ConfigIter i = tags.first; i != tags.second; ++i)
 336         {
 337                 ConfigTag* tag = i->second;
 338                 reference<Link> L = new Link(tag);
 339                 std::string linkname = tag->getString("name");
 340                 L->Name = linkname.c_str();
 341                 L->AllowMask = tag->getString("allowmask");
 342                 L->IPAddr = tag->getString("ipaddr");
 343                 L->Port = tag->getInt("port");
 344                 L->SendPass = tag->getString("sendpass", tag->getString("password"));
 345                 L->RecvPass = tag->getString("recvpass", tag->getString("password"));
 346                 L->Fingerprint = tag->getString("fingerprint");
 347                 L->HiddenFromStats = tag->getBool("statshidden");
 348                 L->Timeout = tag->getInt("timeout", 30);
 349                 L->Hook = tag->getString("ssl");
 350                 L->Bind = tag->getString("bind");
 351                 L->Hidden = tag->getBool("hidden");
 352
 353                 if (L->Name.empty())
 354                         throw ModuleException("Invalid configuration, found a link tag without a name!" + (!L->IPAddr.empty() ? " IP address: "+L->IPAddr : ""));
 355
 356                 if (L->Name.find('.') == std::string::npos)
 357                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it must contain at least one '.' character");
 358
 359                 if (L->Name.length() > 64)
 360                         throw ModuleException("The link name '"+assign(L->Name)+"' is invalid as it is longer than 64 characters");
 361
 362                 if (L->RecvPass.empty())
 363                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', recvpass not defined");
 364
 365                 if (L->SendPass.empty())
 366                         throw ModuleException("Invalid configuration for server '"+assign(L->Name)+"', sendpass not defined");
 367
 368                 if ((L->SendPass.find(' ') != std::string::npos) || (L->RecvPass.find(' ') != std::string::npos))
 369                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that contains a space character which is invalid");
 370
 371                 if ((L->SendPass[0] == ':') || (L->RecvPass[0] == ':'))
 372                         throw ModuleException("Link block '" + assign(L->Name) + "' has a password set that begins with a colon (:) which is invalid");
 373
 374                 if (L->IPAddr.empty())
 375                 {
 376                         L->IPAddr = "*";
 377                         ServerInstance->Logs->Log("m_spanningtree",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.");
 378                 }
 379
 380                 if (!L->Port)
 381                         ServerInstance->Logs->Log("m_spanningtree",LOG_DEFAULT,"Configuration warning: Link block '" + assign(L->Name) + "' has no port defined, you will not be able to /connect it.");
 382
 383                 L->Fingerprint.erase(std::remove(L->Fingerprint.begin(), L->Fingerprint.end(), ':'), L->Fingerprint.end());
 384                 LinkBlocks.push_back(L);
 385         }
 386
 387         tags = ServerInstance->Config->ConfTags("autoconnect");
 388         for(ConfigIter i = tags.first; i != tags.second; ++i)
 389         {
 390                 ConfigTag* tag = i->second;
 391                 reference<Autoconnect> A = new Autoconnect(tag);
 392                 A->Period = tag->getInt("period");
 393                 A->NextConnectTime = ServerInstance->Time() + A->Period;
 394                 A->position = -1;
 395                 irc::spacesepstream ss(tag->getString("server"));
 396                 std::string server;
 397                 while (ss.GetToken(server))
 398                 {
 399                         A->servers.push_back(server);
 400                 }
 401
 402                 if (A->Period <= 0)
 403                 {
 404                         throw ModuleException("Invalid configuration for autoconnect, period not a positive integer!");
 405                 }
 406
 407                 if (A->servers.empty())
 408                 {
 409                         throw ModuleException("Invalid configuration for autoconnect, server cannot be empty!");
 410                 }
 411
 412                 AutoconnectBlocks.push_back(A);
 413         }
 414
 415         RefreshIPCache();
 416 }
 417
 418 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 419 {
 420         for (std::vector<reference<Link> >::iterator i = LinkBlocks.begin(); i != LinkBlocks.end(); ++i)
 421         {
 422                 Link* x = *i;
 423                 if (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 424                 {
 425                         return x;
 426                 }
 427         }
 428         return NULL;
 429 }