/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009 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 "m_spanningtree/treesocket.h"
#include "m_spanningtree/treeserver.h"
#include "m_spanningtree/utils.h"
#include "m_spanningtree/main.h"
/* $ModDep: m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/treesocket.h */
std::string TreeSocket::MyCapabilities()
{
std::vector<std::string> modlist = this->ServerInstance->Modules->GetAllModuleNames(VF_COMMON);
std::string capabilities;
sort(modlist.begin(),modlist.end());
for (unsigned int i = 0; i < modlist.size(); i++)
{
if (i)
capabilities = capabilities + ",";
capabilities = capabilities + modlist[i];
}
return capabilities;
}
void TreeSocket::SendCapabilities()
{
if (sentcapab)
return;
sentcapab = true;
irc::commasepstream modulelist(MyCapabilities());
this->WriteLine("CAPAB START");
/* 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.append(",");
line.append(item);
}
if (line != "CAPAB MODULES ")
this->WriteLine(line);
int ip6 = 0;
int ip6support = 0;
#ifdef IPV6
ip6 = 1;
#endif
#ifdef SUPPORT_IP6LINKS
ip6support = 1;
#endif
std::string extra;
/* Do we have sha256 available? If so, we send a challenge */
if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
{
this->SetOurChallenge(RandString(20));
extra = " CHALLENGE=" + this->GetOurChallenge();
}
this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
" HALFOP="+ConvToStr(ServerInstance->Config->AllowHalfop)+
" 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)+
" IP6NATIVE="+ConvToStr(ip6)+
" IP6SUPPORT="+ConvToStr(ip6support)+
" 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");
}
/* Check a comma seperated list for an item */
bool TreeSocket::HasItem(const std::string &list, const std::string &item)
{
irc::commasepstream seplist(list);
std::string item2;
while (seplist.GetToken(item2))
{
if (item2 == item)
return true;
}
return false;
}
/* Isolate and return the elements that are different between two comma seperated lists */
std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
{
irc::commasepstream list_one(one);
std::string item;
std::string result;
while (list_one.GetToken(item))
{
if (!HasItem(two, item))
{
result.append(" ");
result.append(item);
}
}
return result;
}
bool TreeSocket::Capab(const std::deque<std::string> ¶ms)
{
if (params.size() < 1)
{
this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
return false;
}
if (params[0] == "START")
{
this->ModuleList.clear();
this->CapKeys.clear();
}
else if (params[0] == "END")
{
std::string reason;
int ip6support = 0;
#ifdef SUPPORT_IP6LINKS
ip6support = 1;
#endif
/* Compare ModuleList and check CapKeys...
* Maybe this could be tidier? -- Brain
*/
if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
{
std::string diffIneed = ListDifference(this->ModuleList, this->MyCapabilities());
std::string diffUneed = ListDifference(this->MyCapabilities(), this->ModuleList);
if (diffIneed.length() == 0 && diffUneed.length() == 0)
{
reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
}
else
{
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->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support))))
reason = "We don't both support linking to IPV6 servers";
if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support))
reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers";
if (this->CapKeys.find("PROTOCOL") == this->CapKeys.end())
{
reason = "Protocol version not specified";
}
else
{
int otherProto = atoi(CapKeys.find("PROTOCOL")->second.c_str());
if (otherProto < MinCompatProtocol)
{
reason = "Server is using protocol version " + ConvToStr(otherProto) +
" which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
+ (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
}
}
if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != this->ServerInstance->Modes->BuildPrefixes())
reason = "One or more of the prefixes on the remote server are invalid on this server.";
if(this->CapKeys.find("CHANMODES") != this->CapKeys.end() && this->CapKeys.find("CHANMODES")->second != this->ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
reason = "One or more of the channel modes on the remote server are invalid on this server.";
if(this->CapKeys.find("USERMODES") != this->CapKeys.end() && this->CapKeys.find("USERMODES")->second != this->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->CapKeys.find("CHALLENGE");
if (Utils->ChallengeResponse && (n != this->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();
this->WriteLine(std::string("SERVER ")+this->ServerInstance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 "+
ServerInstance->Config->GetSID()+" :"+this->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();
this->WriteLine(std::string("SERVER ")+this->ServerInstance->Config->ServerName+" "+OutboundPass+" 0 "+ServerInstance->Config->GetSID()+" :"+this->ServerInstance->Config->ServerDesc);
}
}
if (reason.length())
{
this->SendError("CAPAB negotiation failed: "+reason);
return false;
}
}
else if ((params[0] == "MODULES") && (params.size() == 2))
{
if (!this->ModuleList.length())
{
this->ModuleList.append(params[1]);
}
else
{
this->ModuleList.append(",");
this->ModuleList.append(params[1]);
}
}
else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
{
irc::tokenstream capabs(params[1]);
std::string item;
bool more = true;
while ((more = capabs.GetToken(item)))
{
/* Process each key/value pair */
std::string::size_type equals = item.rfind('=');
if (equals != std::string::npos)
{
std::string var = item.substr(0, equals);
std::string value = item.substr(equals+1, item.length());
CapKeys[var] = value;
}
}
}
return true;
}
