/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "xline.h"
#include "treesocket.h"
#include "treeserver.h"
#include "utils.h"
#include "link.h"
#include "main.h"
std::string TreeSocket::MyModules(int filter)
{
std::vector<std::string> modlist = ServerInstance->Modules->GetAllModuleNames(filter);
if (filter == VF_COMMON && proto_version != ProtocolVersion)
CompatAddModules(modlist);
std::string capabilities;
sort(modlist.begin(),modlist.end());
for (unsigned int i = 0; i < modlist.size(); i++)
{
if (i)
capabilities.push_back(proto_version > 1201 ? ' ' : ',');
capabilities.append(modlist[i]);
Module* m = ServerInstance->Modules->Find(modlist[i]);
if (m && proto_version > 1201)
{
Version v = m->GetVersion();
if (!v.link_data.empty())
{
capabilities.push_back('=');
capabilities.append(v.link_data);
}
}
}
return capabilities;
}
static std::string BuildModeList(ModeType type)
{
std::vector<std::string> modes;
for(char c='A'; c <= 'z'; c++)
{
ModeHandler* mh = ServerInstance->Modes->FindMode(c, type);
if (mh)
{
std::string mdesc = mh->name;
mdesc.push_back('=');
if (mh->GetPrefix())
mdesc.push_back(mh->GetPrefix());
if (mh->GetModeChar())
mdesc.push_back(mh->GetModeChar());
modes.push_back(mdesc);
}
}
sort(modes.begin(), modes.end());
irc::stringjoiner line(" ", modes, 0, modes.size() - 1);
return line.GetJoined();
}
void TreeSocket::SendCapabilities(int phase)
{
if (capab->capab_phase >= phase)
return;
if (capab->capab_phase < 1 && phase >= 1)
WriteLine("CAPAB START " + ConvToStr(ProtocolVersion));
capab->capab_phase = phase;
if (phase < 2)
return;
char sep = proto_version > 1201 ? ' ' : ',';
irc::sepstream modulelist(MyModules(VF_COMMON), sep);
irc::sepstream optmodulelist(MyModules(VF_OPTCOMMON), sep);
/* Send module names, split at 509 length */
std::string item;
std::string line = "CAPAB MODULES :";
while (modulelist.GetToken(item))
{
if (line.length() + item.length() + 1 > 509)
{
this->WriteLine(line);
line = "CAPAB MODULES :";
}
if (line != "CAPAB MODULES :")
line.push_back(sep);
line.append(item);
}
if (line != "CAPAB MODULES :")
this->WriteLine(line);
line = "CAPAB MODSUPPORT :";
while (optmodulelist.GetToken(item))
{
if (line.length() + item.length() + 1 > 509)
{
this->WriteLine(line);
line = "CAPAB MODSUPPORT :";
}
if (line != "CAPAB MODSUPPORT :")
line.push_back(sep);
line.append(item);
}
if (line != "CAPAB MODSUPPORT :")
this->WriteLine(line);
WriteLine("CAPAB CHANMODES :" + BuildModeList(MODETYPE_CHANNEL));
WriteLine("CAPAB USERMODES :" + BuildModeList(MODETYPE_USER));
std::string extra;
/* Do we have sha256 available? If so, we send a challenge */
if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
{
SetOurChallenge(ServerInstance->GenRandomStr(20));
extra = " CHALLENGE=" + this->GetOurChallenge();
}
if (proto_version < 1202)
extra += ServerInstance->Modes->FindMode('h', MODETYPE_CHANNEL) ? " HALFOP=1" : " HALFOP=0";
this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
" CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
" MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
" IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
" MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
" MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
" MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
" MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
" MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
" IP6SUPPORT=1"+
" PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
" PREFIX="+ServerInstance->Modes->BuildPrefixes()+
" CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
" USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
" SVSPART=1");
this->WriteLine("CAPAB END");
}
/* Isolate and return the elements that are different between two comma seperated lists */
void TreeSocket::ListDifference(const std::string &one, const std::string &two, char sep,
std::string& mleft, std::string& mright)
{
std::set<std::string> values;
irc::sepstream sepleft(one, sep);
irc::sepstream sepright(two, sep);
std::string item;
while (sepleft.GetToken(item))
{
values.insert(item);
}
while (sepright.GetToken(item))
{
if (!values.erase(item))
{
mright.push_back(sep);
mright.append(item);
}
}
for(std::set<std::string>::iterator i = values.begin(); i != values.end(); ++i)
{
mleft.push_back(sep);
mleft.append(*i);
}
}
bool TreeSocket::Capab(const parameterlist ¶ms)
{
if (params.size() < 1)
{
this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
return false;
}
if (params[0] == "START")
{
capab->ModuleList.clear();
capab->OptModuleList.clear();
capab->CapKeys.clear();
if (params.size() > 1)
proto_version = atoi(params[1].c_str());
SendCapabilities(2);
}
else if (params[0] == "END")
{
std::string reason;
/* Compare ModuleList and check CapKeys */
if ((this->capab->ModuleList != this->MyModules(VF_COMMON)) && (this->capab->ModuleList.length()))
{
std::string diffIneed, diffUneed;
ListDifference(this->capab->ModuleList, this->MyModules(VF_COMMON), proto_version > 1201 ? ' ' : ',', diffIneed, diffUneed);
if (diffIneed.length() || diffUneed.length())
{
reason = "Modules incorrectly matched on these servers.";
if (diffIneed.length())
reason += " Not loaded here:" + diffIneed;
if (diffUneed.length())
reason += " Not loaded there:" + diffUneed;
this->SendError("CAPAB negotiation failed: "+reason);
return false;
}
}
if (this->capab->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->capab->OptModuleList.length())
{
std::string diffIneed, diffUneed;
ListDifference(this->capab->OptModuleList, this->MyModules(VF_OPTCOMMON), ' ', diffIneed, diffUneed);
if (diffIneed.length() || diffUneed.length())
{
if (Utils->AllowOptCommon)
{
ServerInstance->SNO->WriteToSnoMask('l',
"Optional module lists do not match, some commands may not work globally.%s%s%s%s",
diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
}
else
{
reason = "Optional modules incorrectly matched on these servers, and options::allowmismatch not set.";
if (diffIneed.length())
reason += " Not loaded here:" + diffIneed;
if (diffUneed.length())
reason += " Not loaded there:" + diffUneed;
this->SendError("CAPAB negotiation failed: "+reason);
return false;
}
}
}
if (this->capab->CapKeys.find("PROTOCOL") == this->capab->CapKeys.end())
{
reason = "Protocol version not specified";
}
else
{
proto_version = atoi(capab->CapKeys.find("PROTOCOL")->second.c_str());
if (proto_version < MinCompatProtocol)
{
reason = "Server is using protocol version " + ConvToStr(proto_version) +
" which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
+ (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
}
}
if(this->capab->CapKeys.find("PREFIX") != this->capab->CapKeys.end() && this->capab->CapKeys.find("PREFIX")->second != ServerInstance->Modes->BuildPrefixes())
reason = "One or more of the prefixes on the remote server are invalid on this server.";
if (!capab->ChanModes.empty())
{
if (capab->ChanModes != BuildModeList(MODETYPE_CHANNEL))
{
std::string diffIneed, diffUneed;
ListDifference(capab->ChanModes, BuildModeList(MODETYPE_CHANNEL), ' ', diffIneed, diffUneed);
if (diffIneed.length() || diffUneed.length())
{
reason = "Channel modes not matched on these servers.";
if (diffIneed.length())
reason += " Not loaded here:" + diffIneed;
if (diffUneed.length())
reason += " Not loaded there:" + diffUneed;
}
}
}
else if (this->capab->CapKeys.find("CHANMODES") != this->capab->CapKeys.end())
{
if (this->capab->CapKeys.find("CHANMODES")->second != ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
reason = "One or more of the channel modes on the remote server are invalid on this server.";
}
if (!capab->UserModes.empty())
{
if (capab->UserModes != BuildModeList(MODETYPE_USER))
{
std::string diffIneed, diffUneed;
ListDifference(capab->UserModes, BuildModeList(MODETYPE_USER), ' ', diffIneed, diffUneed);
if (diffIneed.length() || diffUneed.length())
{
reason = "User modes not matched on these servers.";
if (diffIneed.length())
reason += " Not loaded here:" + diffIneed;
if (diffUneed.length())
reason += " Not loaded there:" + diffUneed;
}
}
}
else if (this->capab->CapKeys.find("USERMODES") != this->capab->CapKeys.end())
{
if (this->capab->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MASK_USER))
reason = "One or more of the user modes on the remote server are invalid on this server.";
}
/* Challenge response, store their challenge for our password */
std::map<std::string,std::string>::iterator n = this->capab->CapKeys.find("CHALLENGE");
if (Utils->ChallengeResponse && (n != this->capab->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
{
/* Challenge-response is on now */
this->SetTheirChallenge(n->second);
if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
{
this->SendCapabilities(2);
this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+this->MakePass(capab->link->SendPass, capab->theirchallenge)+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
}
}
else
{
/* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
if (this->LinkState == CONNECTING)
{
this->SendCapabilities(2);
this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+capab->link->SendPass+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
}
}
if (reason.length())
{
this->SendError("CAPAB negotiation failed: "+reason);
return false;
}
}
else if ((params[0] == "MODULES") && (params.size() == 2))
{
if (!capab->ModuleList.length())
{
capab->ModuleList = params[1];
}
else
{
capab->ModuleList.push_back(proto_version > 1201 ? ' ' : ',');
capab->ModuleList.append(params[1]);
}
}
else if ((params[0] == "MODSUPPORT") && (params.size() == 2))
{
if (!capab->OptModuleList.length())
{
capab->OptModuleList = params[1];
}
else
{
capab->OptModuleList.push_back(' ');
capab->OptModuleList.append(params[1]);
}
}
else if ((params[0] == "CHANMODES") && (params.size() == 2))
{
capab->ChanModes = params[1];
}
else if ((params[0] == "USERMODES") && (params.size() == 2))
{
capab->UserModes = params[1];
}
else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
{
irc::tokenstream capabs(params[1]);
std::string item;
while (capabs.GetToken(item))
{
/* Process each key/value pair */
std::string::size_type equals = item.find('=');
if (equals != std::string::npos)
{
std::string var = item.substr(0, equals);
std::string value = item.substr(equals+1, item.length());
capab->CapKeys[var] = value;
}
}
}
return true;
}
