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-rw-r--r--src/modules/m_anticaps.cpp309
1 files changed, 309 insertions, 0 deletions
diff --git a/src/modules/m_anticaps.cpp b/src/modules/m_anticaps.cpp
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+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ * Copyright (C) 2017 Peter Powell <petpow@saberuk.com>
+ *
+ * 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 "modules/exemption.h"
+
+enum AntiCapsMethod
+{
+ ACM_BAN,
+ ACM_BLOCK,
+ ACM_MUTE,
+ ACM_KICK,
+ ACM_KICK_BAN
+};
+
+class AntiCapsSettings
+{
+ public:
+ const AntiCapsMethod method;
+ const uint16_t minlen;
+ const uint8_t percent;
+
+ AntiCapsSettings(const AntiCapsMethod& Method, const uint16_t& MinLen, const uint8_t& Percent)
+ : method(Method)
+ , minlen(MinLen)
+ , percent(Percent)
+ {
+ }
+};
+
+class AntiCapsMode : public ParamMode<AntiCapsMode, SimpleExtItem<AntiCapsSettings> >
+{
+ private:
+ bool ParseMethod(irc::sepstream& stream, AntiCapsMethod& method)
+ {
+ std::string methodstr;
+ if (!stream.GetToken(methodstr))
+ return false;
+
+ if (irc::equals(methodstr, "ban"))
+ method = ACM_BAN;
+ else if (irc::equals(methodstr, "block"))
+ method = ACM_BLOCK;
+ else if (irc::equals(methodstr, "mute"))
+ method = ACM_MUTE;
+ else if (irc::equals(methodstr, "kick"))
+ method = ACM_KICK;
+ else if (irc::equals(methodstr, "kickban"))
+ method = ACM_KICK_BAN;
+ else
+ return false;
+
+ return true;
+ }
+
+ bool ParseMinimumLength(irc::sepstream& stream, uint16_t& minlen)
+ {
+ std::string minlenstr;
+ if (!stream.GetToken(minlenstr))
+ return false;
+
+ uint16_t result = atoi(minlenstr.c_str());
+ if (result < 1 || result > ServerInstance->Config->Limits.MaxLine)
+ return false;
+
+ minlen = result;
+ return true;
+ }
+
+ bool ParsePercent(irc::sepstream& stream, uint8_t& percent)
+ {
+ std::string percentstr;
+ if (!stream.GetToken(percentstr))
+ return false;
+
+ int result = atoi(percentstr.c_str());
+ if (result < 1 || result > 100)
+ return false;
+
+ percent = result;
+ return true;
+ }
+
+ public:
+ AntiCapsMode(Module* Creator)
+ : ParamMode<AntiCapsMode, SimpleExtItem<AntiCapsSettings> >(Creator, "anticaps", 'B')
+ {
+ }
+
+ ModeAction OnSet(User* source, Channel* channel, std::string& parameter)
+ {
+ irc::sepstream stream(parameter, ':');
+ AntiCapsMethod method;
+ uint16_t minlen;
+ uint8_t percent;
+
+ // Attempt to parse the method.
+ if (!ParseMethod(stream, method) || !ParseMinimumLength(stream, minlen) || !ParsePercent(stream, percent))
+ {
+ source->WriteNumeric(Numerics::InvalidModeParameter(channel, this, parameter, "Invalid anticaps mode parameter. Syntax: <ban|block|mute|kick|kickban>:{minlen}:{percent}."));
+ return MODEACTION_DENY;
+ }
+
+ ext.set(channel, new AntiCapsSettings(method, minlen, percent));
+ return MODEACTION_ALLOW;
+ }
+
+ void SerializeParam(Channel* chan, const AntiCapsSettings* acs, std::string& out)
+ {
+ switch (acs->method)
+ {
+ case ACM_BAN:
+ out.append("ban");
+ break;
+ case ACM_BLOCK:
+ out.append("block");
+ break;
+ case ACM_MUTE:
+ out.append("mute");
+ break;
+ case ACM_KICK:
+ out.append("kick");
+ break;
+ case ACM_KICK_BAN:
+ out.append("kickban");
+ break;
+ default:
+ out.append("unknown~");
+ out.append(ConvToStr(acs->method));
+ break;
+ }
+ out.push_back(':');
+ out.append(ConvToStr(acs->minlen));
+ out.push_back(':');
+ out.append(ConvToStr(acs->percent));
+ }
+};
+
+class ModuleAntiCaps : public Module
+{
+ private:
+ CheckExemption::EventProvider exemptionprov;
+ std::bitset<UCHAR_MAX> uppercase;
+ std::bitset<UCHAR_MAX> lowercase;
+ AntiCapsMode mode;
+
+ void CreateBan(Channel* channel, User* user, bool mute)
+ {
+ std::string banmask(mute ? "m:" : "");
+ banmask.append("*!*@");
+ banmask.append(user->GetDisplayedHost());
+
+ Modes::ChangeList changelist;
+ changelist.push_add(ServerInstance->Modes->FindMode('b', MODETYPE_CHANNEL), banmask);
+ ServerInstance->Modes->Process(ServerInstance->FakeClient, channel, NULL, changelist);
+ }
+
+ void InformUser(Channel* channel, User* user, const std::string& message)
+ {
+ user->WriteNumeric(ERR_CANNOTSENDTOCHAN, channel, message + " and was blocked.");
+ }
+
+ public:
+ ModuleAntiCaps()
+ : exemptionprov(this)
+ , mode(this)
+ {
+ }
+
+ void ReadConfig(ConfigStatus&) CXX11_OVERRIDE
+ {
+ ConfigTag* tag = ServerInstance->Config->ConfValue("anticaps");
+
+ uppercase.reset();
+ const std::string upper = tag->getString("uppercase", "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
+ for (std::string::const_iterator iter = upper.begin(); iter != upper.end(); ++iter)
+ uppercase.set(static_cast<unsigned char>(*iter));
+
+ lowercase.reset();
+ const std::string lower = tag->getString("lowercase", "abcdefghijklmnopqrstuvwxyz");
+ for (std::string::const_iterator iter = lower.begin(); iter != lower.end(); ++iter)
+ lowercase.set(static_cast<unsigned char>(*iter));
+ }
+
+ ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) CXX11_OVERRIDE
+ {
+ // We only want to operate on messages from local users.
+ if (!IS_LOCAL(user))
+ return MOD_RES_PASSTHRU;
+
+ // The mode can only be applied to channels.
+ if (target.type != MessageTarget::TYPE_CHANNEL)
+ return MOD_RES_PASSTHRU;
+
+ // We only act if the channel has the mode set.
+ Channel* channel = target.Get<Channel>();
+ if (!channel->IsModeSet(&mode))
+ return MOD_RES_PASSTHRU;
+
+ // If the user is exempt from anticaps then we don't need
+ // to do anything else.
+ ModResult result = CheckExemption::Call(exemptionprov, user, channel, "anticaps");
+ if (result == MOD_RES_ALLOW)
+ return MOD_RES_PASSTHRU;
+
+ // If the message is a CTCP then we skip it unless it is
+ // an ACTION in which case we skip the prefix and suffix.
+ std::string::const_iterator text_begin = details.text.begin();
+ std::string::const_iterator text_end = details.text.end();
+ if (details.text[0] == '\1')
+ {
+ // If the CTCP is not an action then skip it.
+ if (details.text.compare(0, 8, "\1ACTION ", 8))
+ return MOD_RES_PASSTHRU;
+
+ // Skip the CTCP message characters.
+ text_begin += 8;
+ if (*details.text.rbegin() == '\1')
+ text_end -= 1;
+ }
+
+ // Retrieve the anticaps config. This should never be
+ // null but its better to be safe than sorry.
+ AntiCapsSettings* config = mode.ext.get(channel);
+ if (!config)
+ return MOD_RES_PASSTHRU;
+
+ // If the message is shorter than the minimum length then
+ // we don't need to do anything else.
+ size_t length = std::distance(text_begin, text_end);
+ if (length < config->minlen)
+ return MOD_RES_PASSTHRU;
+
+ // Count the characters to see how many upper case and
+ // ignored (non upper or lower) characters there are.
+ size_t upper = 0;
+ for (std::string::const_iterator iter = text_begin; iter != text_end; ++iter)
+ {
+ unsigned char chr = static_cast<unsigned char>(*iter);
+ if (uppercase.test(chr))
+ upper += 1;
+ else if (!lowercase.test(chr))
+ length -= 1;
+ }
+
+ // If the message was entirely symbols then the message
+ // can't contain any upper case letters.
+ if (length == 0)
+ return MOD_RES_PASSTHRU;
+
+ // Calculate the percentage.
+ double percent = round((upper * 100) / length);
+ if (percent < config->percent)
+ return MOD_RES_PASSTHRU;
+
+ const std::string message = InspIRCd::Format("Your message exceeded the %d%% upper case character threshold for %s",
+ config->percent, channel->name.c_str());
+
+ switch (config->method)
+ {
+ case ACM_BAN:
+ InformUser(channel, user, message);
+ CreateBan(channel, user, false);
+ break;
+
+ case ACM_BLOCK:
+ InformUser(channel, user, message);
+ break;
+
+ case ACM_MUTE:
+ InformUser(channel, user, message);
+ CreateBan(channel, user, true);
+ break;
+
+ case ACM_KICK:
+ channel->KickUser(ServerInstance->FakeClient, user, message);
+ break;
+
+ case ACM_KICK_BAN:
+ CreateBan(channel, user, false);
+ channel->KickUser(ServerInstance->FakeClient, user, message);
+ break;
+ }
+ return MOD_RES_DENY;
+ }
+
+ Version GetVersion() CXX11_OVERRIDE
+ {
+ return Version("Provides support for punishing users that send capitalised messages.", VF_COMMON|VF_VENDOR);
+ }
+};
+
+MODULE_INIT(ModuleAntiCaps)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-30 21:14:05 +0000