/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2021 Herman <GermanAizek@yandex.ru>
* Copyright (C) 2014, 2018-2020 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2016, 2018 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007-2009 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2005-2008 Craig Edwards <brain@inspircd.org>
*
* 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"
enum
{
// From RFC 1459.
ERR_NOTREGISTERED = 451,
ERR_NEEDMOREPARAMS = 461,
// InspIRCd-specific.
RPL_SYNTAX = 650,
};
bool CommandParser::LoopCall(User* user, Command* handler, const CommandBase::Params& parameters, unsigned int splithere, int extra, bool usemax)
{
if (splithere >= parameters.size())
return false;
/* First check if we have more than one item in the list, if we don't we return false here and the handler
* which called us just carries on as it was.
*/
if (parameters[splithere].find(',') == std::string::npos)
return false;
/** Some lame ircds will weed out dupes using some shitty O(n^2) algorithm.
* By using std::set (thanks for the idea w00t) we can cut this down a ton.
* ...VOOODOOOO!
*
* Only check for duplicates if there is one list (allow them in JOIN).
*/
insp::flat_set<std::string, irc::insensitive_swo> dupes;
bool check_dupes = (extra < 0);
/* Create two sepstreams, if we have only one list, then initialize the second sepstream with
* an empty string. The second parameter of the constructor of the sepstream tells whether
* or not to allow empty tokens.
* We allow empty keys, so "JOIN #a,#b ,bkey" will be interpreted as "JOIN #a", "JOIN #b bkey"
*/
irc::commasepstream items1(parameters[splithere]);
irc::commasepstream items2(extra >= 0 ? parameters[extra] : "", true);
std::string item;
size_t max = 0;
LocalUser* localuser = IS_LOCAL(user);
/* Attempt to iterate these lists and call the command handler
* for every parameter or parameter pair until there are no more
* left to parse.
*/
CommandBase::Params splitparams(parameters);
while (items1.GetToken(item) && (!usemax || max++ < ServerInstance->Config->MaxTargets))
{
if ((!check_dupes) || (dupes.insert(item).second))
{
splitparams[splithere] = item;
if (extra >= 0)
{
// If we have two lists then get the next item from the second list.
// In case it runs out of elements then 'item' will be an empty string.
items2.GetToken(item);
splitparams[extra] = item;
}
CmdResult result = handler->Handle(user, splitparams);
if (localuser)
{
// Run the OnPostCommand hook with the last parameter being true to indicate
// that the event is being called in a loop.
item.clear();
FOREACH_MOD(OnPostCommand, (handler, splitparams, localuser, result, true));
}
}
}
return true;
}
Command* CommandParser::GetHandler(const std::string& commandname)
{
CommandMap::iterator n = cmdlist.find(commandname);
if (n != cmdlist.end())
return n->second;
return nullptr;
}
// calls a handler function for a command
CmdResult CommandParser::CallHandler(const std::string& commandname, const CommandBase::Params& parameters, User* user, Command** cmd)
{
/* find the command, check it exists */
Command* handler = GetHandler(commandname);
if (handler)
{
if ((!parameters.empty()) && (parameters.back().empty()) && (!handler->allow_empty_last_param))
return CmdResult::INVALID;
if (parameters.size() >= handler->min_params)
{
bool bOkay = false;
if (IS_LOCAL(user))
{
switch (handler->access_needed)
{
case CmdAccess::NORMAL: // Anyone can execute.
bOkay = true;
break;
case CmdAccess::OPERATOR: // Only opers can execute.
bOkay = user->HasCommandPermission(commandname);
break;
case CmdAccess::SERVER: // Only servers can execute.
bOkay = IS_SERVER(user);
break;
}
}
else
{
/* remote or no flags required anyway */
bOkay = true;
}
if (bOkay)
{
if (cmd)
*cmd = handler;
ClientProtocol::TagMap tags;
return handler->Handle(user, CommandBase::Params(parameters, tags));
}
}
}
return CmdResult::INVALID;
}
void CommandParser::ProcessCommand(LocalUser* user, std::string& command, CommandBase::Params& command_p)
{
/* find the command, check it exists */
Command* handler = GetHandler(command);
// Penalty to give if the command fails before the handler is executed
unsigned int failpenalty = 0;
/* Modify the user's penalty regardless of whether or not the command exists */
if (!user->HasPrivPermission("users/flood/no-throttle"))
{
// If it *doesn't* exist, give it a slightly heftier penalty than normal to deter flooding us crap
unsigned int penalty = handler ? handler->penalty : 2000;
user->CommandFloodPenalty += penalty;
// Increase their penalty later if we fail and the command has 0 penalty by default (i.e. in Command::penalty) to
// throttle sending ERR_* from the command parser. If the command does have a non-zero penalty then this is not
// needed because we've increased their penalty above.
if (penalty == 0)
failpenalty = 1000;
}
if (!handler)
{
ModResult MOD_RESULT;
FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, command_p, user, false));
if (MOD_RESULT == MOD_RES_DENY)
{
FOREACH_MOD(OnCommandBlocked, (command, command_p, user));
return;
}
/*
* This double lookup is in case a module (abbreviation) wishes to change a command.
* Sure, the double lookup is a bit painful, but bear in mind this only happens for unknowns anyway.
*
* Thanks dz for making me actually understand why this is necessary!
* -- w00t
*/
handler = GetHandler(command);
if (!handler)
{
if (user->IsFullyConnected())
user->WriteNumeric(ERR_UNKNOWNCOMMAND, command, "Unknown command");
ServerInstance->Stats.Unknown++;
FOREACH_MOD(OnCommandBlocked, (command, command_p, user));
return;
}
}
// If we were given more parameters than max_params then append the excess parameter(s)
// to command_p[maxparams-1], i.e. to the last param that is still allowed
if (handler->max_params && command_p.size() > handler->max_params)
{
/*
* command_p input (assuming max_params 1):
* this
* is
* a
* test
*/
// Iterator to the last parameter that will be kept
const CommandBase::Params::iterator lastkeep = command_p.begin() + (handler->max_params - 1);
// Iterator to the first excess parameter
const CommandBase::Params::iterator firstexcess = lastkeep + 1;
// Append all excess parameter(s) to the last parameter, separated by spaces
for (const auto& param : insp::iterator_range(firstexcess, command_p.end()))
{
lastkeep->push_back(' ');
lastkeep->append(param);
}
// Erase the excess parameter(s)
command_p.erase(firstexcess, command_p.end());
}
/*
* We call OnPreCommand here separately if the command exists, so the magic above can
* truncate to max_params if necessary. -- w00t
*/
ModResult MOD_RESULT;
FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, command_p, user, false));
if (MOD_RESULT == MOD_RES_DENY)
{
FOREACH_MOD(OnCommandBlocked, (command, command_p, user));
return;
}
/* activity resets the ping pending timer */
user->nextping = ServerInstance->Time() + user->GetClass()->pingtime;
switch (handler->access_needed)
{
case CmdAccess::NORMAL:
break; // Nothing special too do.
case CmdAccess::OPERATOR:
{
if (!user->IsOper())
{
user->CommandFloodPenalty += failpenalty;
user->WriteNumeric(ERR_NOPRIVILEGES, "Permission Denied - You do not have the required operator privileges");
FOREACH_MOD(OnCommandBlocked, (command, command_p, user));
return;
}
if (!user->HasCommandPermission(command))
{
user->CommandFloodPenalty += failpenalty;
user->WriteNumeric(ERR_NOPRIVILEGES, INSP_FORMAT("Permission Denied - Oper type {} does not have access to command {}",
user->oper->GetType(), command));
FOREACH_MOD(OnCommandBlocked, (command, command_p, user));
return;
}
break;
}
case CmdAccess::SERVER:
{
if (user->IsFullyConnected())
user->WriteNumeric(ERR_UNKNOWNCOMMAND, command, "Unknown command");
ServerInstance->Stats.Unknown++;
FOREACH_MOD(OnCommandBlocked, (command, command_p, user));
break;
}
}
if ((!command_p.empty()) && (command_p.back().empty()) && (!handler->allow_empty_last_param))
command_p.pop_back();
if (command_p.size() < handler->min_params)
{
user->CommandFloodPenalty += failpenalty;
handler->TellNotEnoughParameters(user, command_p);
FOREACH_MOD(OnCommandBlocked, (command, command_p, user));
return;
}
if (!user->IsFullyConnected() && !handler->works_before_reg)
{
user->CommandFloodPenalty += failpenalty;
handler->TellNotFullyConnected(user, command_p);
FOREACH_MOD(OnCommandBlocked, (command, command_p, user));
}
else
{
/* passed all checks.. first, do the (ugly) stats counters. */
handler->use_count++;
/* module calls too */
FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, command_p, user, true));
if (MOD_RESULT == MOD_RES_DENY)
{
FOREACH_MOD(OnCommandBlocked, (command, command_p, user));
return;
}
/*
* WARNING: be careful, the user may be deleted soon
*/
CmdResult result = handler->Handle(user, command_p);
FOREACH_MOD(OnPostCommand, (handler, command_p, user, result, false));
}
}
void CommandParser::RemoveCommand(Command* x)
{
CommandMap::iterator n = cmdlist.find(x->name);
if (n != cmdlist.end() && n->second == x)
cmdlist.erase(n);
}
void CommandParser::ProcessBuffer(LocalUser* user, const std::string& buffer)
{
ClientProtocol::ParseOutput parseoutput;
if (!user->serializer->Parse(user, buffer, parseoutput))
return;
std::string& command = parseoutput.cmd;
std::transform(command.begin(), command.end(), command.begin(), ::toupper);
CommandBase::Params parameters(parseoutput.params, parseoutput.tags);
ProcessCommand(user, command, parameters);
}
bool CommandParser::AddCommand(Command* cmd)
{
return cmdlist.emplace(cmd->name, cmd).second;
}
std::string CommandParser::TranslateUIDs(const std::vector<TranslateType>& to, const CommandBase::Params& source, bool prefix_final, CommandBase* custom_translator)
{
std::vector<TranslateType>::const_iterator types = to.begin();
std::string dest;
for (unsigned int i = 0; i < source.size(); i++)
{
TranslateType t = TR_TEXT;
// They might supply less translation types than parameters,
// in that case pretend that all remaining types are TR_TEXT
if (types != to.end())
{
t = *types;
types++;
}
bool last = (i == (source.size() - 1));
if (prefix_final && last)
dest.push_back(':');
TranslateSingleParam(t, source[i], dest, custom_translator, i);
if (!last)
dest.push_back(' ');
}
return dest;
}
void CommandParser::TranslateSingleParam(TranslateType to, const std::string& item, std::string& dest, CommandBase* custom_translator, unsigned int paramnumber)
{
switch (to)
{
case TR_NICK:
{
/* Translate single nickname */
auto* user = ServerInstance->Users.Find(item);
if (user)
dest.append(user->uuid);
else
dest.append(item);
break;
}
case TR_CUSTOM:
{
if (custom_translator)
{
std::string translated = item;
custom_translator->EncodeParameter(translated, paramnumber);
dest.append(translated);
break;
}
// If no custom translator was given, fall through
}
[[fallthrough]];
default:
/* Do nothing */
dest.append(item);
break;
}
}
CommandBase::CommandBase(Module* mod, const std::string& cmd, unsigned int minpara, unsigned int maxpara)
: ServiceProvider(mod, cmd, SERVICE_COMMAND)
, min_params(minpara)
, max_params(maxpara)
{
}
void CommandBase::EncodeParameter(std::string& parameter, unsigned int index)
{
}
RouteDescriptor CommandBase::GetRouting(User* user, const Params& parameters)
{
return ROUTE_LOCALONLY;
}
Command::Command(Module* mod, const std::string& cmd, unsigned int minpara, unsigned int maxpara)
: CommandBase(mod, cmd, minpara, maxpara)
{
}
Command::~Command()
{
ServerInstance->Parser.RemoveCommand(this);
}
void Command::RegisterService()
{
if (!ServerInstance->Parser.AddCommand(this))
throw ModuleException(creator, "Command already exists: " + name);
}
void Command::TellNotEnoughParameters(LocalUser* user, const Params& parameters)
{
user->WriteNumeric(ERR_NEEDMOREPARAMS, name, "Not enough parameters.");
if (ServerInstance->Config->SyntaxHints && user->IsFullyConnected())
{
for (const auto& syntaxline : this->syntax)
user->WriteNumeric(RPL_SYNTAX, name, syntaxline);
}
}
void Command::TellNotFullyConnected(LocalUser* user, const Params& parameters)
{
user->WriteNumeric(ERR_NOTREGISTERED, name, "You must be fully connected to use this command.");
}
SplitCommand::SplitCommand(Module* me, const std::string& cmd, unsigned int minpara, unsigned int maxpara)
: Command(me, cmd, minpara, maxpara)
{
}
CmdResult SplitCommand::Handle(User* user, const Params& parameters)
{
switch (user->usertype)
{
case User::TYPE_LOCAL:
return HandleLocal(static_cast<LocalUser*>(user), parameters);
case User::TYPE_REMOTE:
return HandleRemote(static_cast<RemoteUser*>(user), parameters);
case User::TYPE_SERVER:
return HandleServer(static_cast<FakeUser*>(user), parameters);
}
ServerInstance->Logs.Debug("COMMAND", "Unknown user type {} in command (uuid={})!",
user->usertype, user->uuid);
return CmdResult::INVALID;
}
CmdResult SplitCommand::HandleLocal(LocalUser* user, const Params& parameters)
{
return CmdResult::INVALID;
}
CmdResult SplitCommand::HandleRemote(RemoteUser* user, const Params& parameters)
{
return CmdResult::INVALID;
}
CmdResult SplitCommand::HandleServer(FakeUser* user, const Params& parameters)
{
return CmdResult::INVALID;
}
