src/modules/m_hostchange.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2005-2007 Craig Edwards <craigedwards@brainbox.cc>
   5  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   6  *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
   7  *
   8  * This file is part of InspIRCd.  InspIRCd is free software: you can
   9  * redistribute it and/or modify it under the terms of the GNU General Public
  10  * License as published by the Free Software Foundation, version 2.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  14  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  15  * details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21
  22 #include "inspircd.h"
  23
  24 /* $ModDesc: Provides masking of user hostnames in a different way to m_cloaking */
  25
  26 /** Holds information on a host set by m_hostchange
  27  */
  28 class Host
  29 {
  30  public:
  31         enum HostChangeAction
  32         {
  33                 HCA_SET,
  34                 HCA_SUFFIX,
  35                 HCA_ADDNICK
  36         };
  37
  38         HostChangeAction action;
  39         std::string newhost;
  40         std::string ports;
  41
  42         Host(HostChangeAction Action, const std::string& Newhost, const std::string& Ports) :
  43                 action(Action), newhost(Newhost), ports(Ports) {}
  44 };
  45
  46 typedef std::vector<std::pair<std::string, Host> > hostchanges_t;
  47
  48 class ModuleHostChange : public Module
  49 {
  50  private:
  51         hostchanges_t hostchanges;
  52         std::string MySuffix;
  53         std::string MyPrefix;
  54         std::string MySeparator;
  55
  56  public:
  57         void init()
  58         {
  59                 OnRehash(NULL);
  60                 Implementation eventlist[] = { I_OnRehash, I_OnUserConnect };
  61                 ServerInstance->Modules->Attach(eventlist, this, 2);
  62         }
  63
  64         virtual void OnRehash(User* user)
  65         {
  66                 ConfigTag* host = ServerInstance->Config->ConfValue("host");
  67                 MySuffix = host->getString("suffix");
  68                 MyPrefix = host->getString("prefix");
  69                 MySeparator = host->getString("separator", ".");
  70                 hostchanges.clear();
  71
  72                 std::set<std::string> dupecheck;
  73                 ConfigTagList tags = ServerInstance->Config->ConfTags("hostchange");
  74                 for (ConfigIter i = tags.first; i != tags.second; ++i)
  75                 {
  76                         ConfigTag* tag = i->second;
  77                         std::string mask = tag->getString("mask");
  78                         if (!dupecheck.insert(mask).second)
  79                                 throw ModuleException("Duplicate hostchange entry: " + mask);
  80
  81                         Host::HostChangeAction act;
  82                         std::string newhost;
  83                         std::string action = tag->getString("action");
  84                         if (!strcasecmp(action.c_str(), "set"))
  85                         {
  86                                 act = Host::HCA_SET;
  87                                 newhost = tag->getString("value");
  88                         }
  89                         else if (!strcasecmp(action.c_str(), "suffix"))
  90                                 act = Host::HCA_SUFFIX;
  91                         else if (!strcasecmp(action.c_str(), "addnick"))
  92                                 act = Host::HCA_ADDNICK;
  93                         else
  94                                 throw ModuleException("Invalid hostchange action: " + action);
  95
  96                         hostchanges.push_back(std::make_pair(mask, Host(act, newhost, tag->getString("ports"))));
  97                 }
  98         }
  99
 100         virtual Version GetVersion()
 101         {
 102                 // returns the version number of the module to be
 103                 // listed in /MODULES
 104                 return Version("Provides masking of user hostnames in a different way to m_cloaking", VF_VENDOR);
 105         }
 106
 107         virtual void OnUserConnect(LocalUser* user)
 108         {
 109                 for (hostchanges_t::iterator i = hostchanges.begin(); i != hostchanges.end(); i++)
 110                 {
 111                         if (((InspIRCd::MatchCIDR(user->MakeHost(), i->first)) || (InspIRCd::MatchCIDR(user->MakeHostIP(), i->first))))
 112                         {
 113                                 const Host& h = i->second;
 114
 115                                 if (!h.ports.empty())
 116                                 {
 117                                         irc::portparser portrange(h.ports, false);
 118                                         long portno = -1;
 119                                         bool foundany = false;
 120
 121                                         while ((portno = portrange.GetToken()))
 122                                                 if (portno == user->GetServerPort())
 123                                                         foundany = true;
 124
 125                                         if (!foundany)
 126                                                 continue;
 127                                 }
 128
 129                                 // host of new user matches a hostchange tag's mask
 130                                 std::string newhost;
 131                                 if (h.action == Host::HCA_SET)
 132                                 {
 133                                         newhost = h.newhost;
 134                                 }
 135                                 else if (h.action == Host::HCA_SUFFIX)
 136                                 {
 137                                         newhost = MySuffix;
 138                                 }
 139                                 else if (h.action == Host::HCA_ADDNICK)
 140                                 {
 141                                         // first take their nick and strip out non-dns, leaving just [A-Z0-9\-]
 142                                         std::string complete;
 143                                         for (std::string::const_iterator j = user->nick.begin(); j != user->nick.end(); ++j)
 144                                         {
 145                                                 if  (((*j >= 'A') && (*j <= 'Z')) ||
 146                                                     ((*j >= 'a') && (*j <= 'z')) ||
 147                                                     ((*j >= '0') && (*j <= '9')) ||
 148                                                     (*j == '-'))
 149                                                 {
 150                                                         complete = complete + *j;
 151                                                 }
 152                                         }
 153                                         if (complete.empty())
 154                                                 complete = "i-have-a-lame-nick";
 155
 156                                         if (!MyPrefix.empty())
 157                                                 newhost = MyPrefix + MySeparator + complete;
 158                                         else
 159                                                 newhost = complete + MySeparator + MySuffix;
 160                                 }
 161                                 if (!newhost.empty())
 162                                 {
 163                                         user->WriteServ("NOTICE "+user->nick+" :Setting your virtual host: " + newhost);
 164                                         if (!user->ChangeDisplayedHost(newhost.c_str()))
 165                                                 user->WriteServ("NOTICE "+user->nick+" :Could not set your virtual host: " + newhost);
 166                                         return;
 167                                 }
 168                         }
 169                 }
 170         }
 171 };
 172
 173 MODULE_INIT(ModuleHostChange)