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         hostchanges_t hostchanges;
  51         std::string MySuffix;
  52         std::string MyPrefix;
  53         std::string MySeparator;
  54
  55  public:
  56         void init() CXX11_OVERRIDE
  57         {
  58                 OnRehash(NULL);
  59                 Implementation eventlist[] = { I_OnRehash, I_OnUserConnect };
  60                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
  61         }
  62
  63         void OnRehash(User* user) CXX11_OVERRIDE
  64         {
  65                 ConfigTag* host = ServerInstance->Config->ConfValue("host");
  66                 MySuffix = host->getString("suffix");
  67                 MyPrefix = host->getString("prefix");
  68                 MySeparator = host->getString("separator", ".");
  69                 hostchanges.clear();
  70
  71                 std::set<std::string> dupecheck;
  72                 ConfigTagList tags = ServerInstance->Config->ConfTags("hostchange");
  73                 for (ConfigIter i = tags.first; i != tags.second; ++i)
  74                 {
  75                         ConfigTag* tag = i->second;
  76                         std::string mask = tag->getString("mask");
  77                         if (!dupecheck.insert(mask).second)
  78                                 throw ModuleException("Duplicate hostchange entry: " + mask);
  79
  80                         Host::HostChangeAction act;
  81                         std::string newhost;
  82                         std::string action = tag->getString("action");
  83                         if (!strcasecmp(action.c_str(), "set"))
  84                         {
  85                                 act = Host::HCA_SET;
  86                                 newhost = tag->getString("value");
  87                         }
  88                         else if (!strcasecmp(action.c_str(), "suffix"))
  89                                 act = Host::HCA_SUFFIX;
  90                         else if (!strcasecmp(action.c_str(), "addnick"))
  91                                 act = Host::HCA_ADDNICK;
  92                         else
  93                                 throw ModuleException("Invalid hostchange action: " + action);
  94
  95                         hostchanges.push_back(std::make_pair(mask, Host(act, newhost, tag->getString("ports"))));
  96                 }
  97         }
  98
  99         Version GetVersion() CXX11_OVERRIDE
 100         {
 101                 // returns the version number of the module to be
 102                 // listed in /MODULES
 103                 return Version("Provides masking of user hostnames in a different way to m_cloaking", VF_VENDOR);
 104         }
 105
 106         void OnUserConnect(LocalUser* user) CXX11_OVERRIDE
 107         {
 108                 for (hostchanges_t::iterator i = hostchanges.begin(); i != hostchanges.end(); i++)
 109                 {
 110                         if (((InspIRCd::MatchCIDR(user->MakeHost(), i->first)) || (InspIRCd::MatchCIDR(user->MakeHostIP(), i->first))))
 111                         {
 112                                 const Host& h = i->second;
 113
 114                                 if (!h.ports.empty())
 115                                 {
 116                                         irc::portparser portrange(h.ports, false);
 117                                         long portno = -1;
 118                                         bool foundany = false;
 119
 120                                         while ((portno = portrange.GetToken()))
 121                                                 if (portno == user->GetServerPort())
 122                                                         foundany = true;
 123
 124                                         if (!foundany)
 125                                                 continue;
 126                                 }
 127
 128                                 // host of new user matches a hostchange tag's mask
 129                                 std::string newhost;
 130                                 if (h.action == Host::HCA_SET)
 131                                 {
 132                                         newhost = h.newhost;
 133                                 }
 134                                 else if (h.action == Host::HCA_SUFFIX)
 135                                 {
 136                                         newhost = MySuffix;
 137                                 }
 138                                 else if (h.action == Host::HCA_ADDNICK)
 139                                 {
 140                                         // first take their nick and strip out non-dns, leaving just [A-Z0-9\-]
 141                                         std::string complete;
 142                                         for (std::string::const_iterator j = user->nick.begin(); j != user->nick.end(); ++j)
 143                                         {
 144                                                 if  (((*j >= 'A') && (*j <= 'Z')) ||
 145                                                     ((*j >= 'a') && (*j <= 'z')) ||
 146                                                     ((*j >= '0') && (*j <= '9')) ||
 147                                                     (*j == '-'))
 148                                                 {
 149                                                         complete = complete + *j;
 150                                                 }
 151                                         }
 152                                         if (complete.empty())
 153                                                 complete = "i-have-a-lame-nick";
 154
 155                                         if (!MyPrefix.empty())
 156                                                 newhost = MyPrefix + MySeparator + complete;
 157                                         else
 158                                                 newhost = complete + MySeparator + MySuffix;
 159                                 }
 160                                 if (!newhost.empty())
 161                                 {
 162                                         user->WriteNotice("Setting your virtual host: " + newhost);
 163                                         if (!user->ChangeDisplayedHost(newhost.c_str()))
 164                                                 user->WriteNotice("Could not set your virtual host: " + newhost);
 165                                         return;
 166                                 }
 167                         }
 168                 }
 169         }
 170 };
 171
 172 MODULE_INIT(ModuleHostChange)