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-rw-r--r--src/modules/m_denychans.cpp192
1 files changed, 123 insertions, 69 deletions
diff --git a/src/modules/m_denychans.cpp b/src/modules/m_denychans.cpp
index 467c8a03b..cc4172529 100644
--- a/src/modules/m_denychans.cpp
+++ b/src/modules/m_denychans.cpp
@@ -1,6 +1,7 @@
/*
* InspIRCd -- Internet Relay Chat Daemon
*
+ *. Copyright (C) 2018 Peter Powell <petpow@saberuk.com>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
@@ -22,58 +23,116 @@
#include "inspircd.h"
+enum
+{
+ // InspIRCd-specific.
+ ERR_BADCHANNEL = 926
+};
+
+struct BadChannel
+{
+ bool allowopers;
+ std::string name;
+ std::string reason;
+ std::string redirect;
+
+ BadChannel(const std::string& Name, const std::string& Redirect, const std::string& Reason, bool AllowOpers)
+ : allowopers(AllowOpers)
+ , name(Name)
+ , reason(Reason)
+ , redirect(Redirect)
+ {
+ }
+};
+
+typedef std::vector<BadChannel> BadChannels;
+typedef std::vector<std::string> GoodChannels;
+
class ModuleDenyChannels : public Module
{
+ private:
+ BadChannels badchannels;
+ GoodChannels goodchannels;
+ UserModeReference antiredirectmode;
ChanModeReference redirectmode;
public:
ModuleDenyChannels()
- : redirectmode(this, "redirect")
+ : antiredirectmode(this, "antiredirect")
+ , redirectmode(this, "redirect")
{
}
void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
{
- /* check for redirect validity and loops/chains */
- ConfigTagList tags = ServerInstance->Config->ConfTags("badchan");
+ GoodChannels goodchans;
+ ConfigTagList tags = ServerInstance->Config->ConfTags("goodchan");
+ for (ConfigIter iter = tags.first; iter != tags.second; ++iter)
+ {
+ ConfigTag* tag = iter->second;
+
+ // Ensure that we have the <goodchan:name> parameter.
+ const std::string name = tag->getString("name");
+ if (name.empty())
+ throw ModuleException("<goodchan:name> is a mandatory field, at " + tag->getTagLocation());
+
+ goodchans.push_back(name);
+ }
+
+ BadChannels badchans;
+ tags = ServerInstance->Config->ConfTags("badchan");
for (ConfigIter i = tags.first; i != tags.second; ++i)
{
- std::string name = i->second->getString("name");
- std::string redirect = i->second->getString("redirect");
+ ConfigTag* tag = i->second;
+
+ // Ensure that we have the <badchan:name> parameter.
+ const std::string name = tag->getString("name");
+ if (name.empty())
+ throw ModuleException("<badchan:name> is a mandatory field, at " + tag->getTagLocation());
+ // Ensure that we have the <badchan:reason> parameter.
+ const std::string reason = tag->getString("reason");
+ if (reason.empty())
+ throw ModuleException("<badchan:reason> is a mandatory field, at " + tag->getTagLocation());
+
+ const std::string redirect = tag->getString("redirect");
if (!redirect.empty())
{
-
+ // Ensure that <badchan:redirect> contains a channel name.
if (!ServerInstance->IsChannel(redirect))
- {
- if (status.srcuser)
- status.srcuser->WriteNotice("Invalid badchan redirect '" + redirect + "'");
- throw ModuleException("Invalid badchan redirect, not a channel");
- }
-
- for (ConfigIter j = tags.first; j != tags.second; ++j)
- {
- if (InspIRCd::Match(redirect, j->second->getString("name")))
- {
- bool goodchan = false;
- ConfigTagList goodchans = ServerInstance->Config->ConfTags("goodchan");
- for (ConfigIter k = goodchans.first; k != goodchans.second; ++k)
- {
- if (InspIRCd::Match(redirect, k->second->getString("name")))
- goodchan = true;
- }
-
- if (!goodchan)
- {
- /* <badchan:redirect> is a badchan */
- if (status.srcuser)
- status.srcuser->WriteNotice("Badchan " + name + " redirects to badchan " + redirect);
- throw ModuleException("Badchan redirect loop");
- }
- }
- }
+ throw ModuleException("<badchan:redirect> is not a valid channel name, at " + tag->getTagLocation());
+
+ // We defer the rest of the validation of the redirect channel until we have
+ // finished parsing all of the badchans.
}
+
+ badchans.push_back(BadChannel(name, redirect, reason, tag->getBool("allowopers")));
+ }
+
+ // Now we have all of the badchan information recorded we can check that all redirect
+ // channels can actually be redirected to.
+ for (BadChannels::const_iterator i = badchans.begin(); i != badchans.end(); ++i)
+ {
+ const BadChannel& badchan = *i;
+
+ // If there is no redirect channel we have nothing to do.
+ if (badchan.redirect.empty())
+ continue;
+
+ // If the redirect channel is whitelisted then it is okay.
+ for (GoodChannels::const_iterator j = goodchans.begin(); j != goodchans.end(); ++j)
+ if (InspIRCd::Match(badchan.redirect, *j))
+ continue;
+
+ // If the redirect channel is not blacklisted then it is okay.
+ for (BadChannels::const_iterator j = badchans.begin(); j != badchans.end(); ++j)
+ if (InspIRCd::Match(badchan.redirect, j->name))
+ throw ModuleException("<badchan:redirect> cannot be a blacklisted channel name");
}
+
+ // The config file contained no errors so we can apply the new configuration.
+ badchannels.swap(badchans);
+ goodchannels.swap(goodchans);
}
Version GetVersion() CXX11_OVERRIDE
@@ -84,45 +143,40 @@ class ModuleDenyChannels : public Module
ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
{
- ConfigTagList tags = ServerInstance->Config->ConfTags("badchan");
- for (ConfigIter j = tags.first; j != tags.second; ++j)
+ for (BadChannels::const_iterator j = badchannels.begin(); j != badchannels.end(); ++j)
{
- if (InspIRCd::Match(cname, j->second->getString("name")))
- {
- if (user->IsOper() && j->second->getBool("allowopers"))
- {
+ const BadChannel& badchan = *j;
+
+ // If the channel does not match the current entry we have nothing else to do.
+ if (!InspIRCd::Match(cname, badchan.name))
+ continue;
+
+ // If the user is an oper and opers are allowed to enter this blacklisted channel
+ // then allow the join.
+ if (user->IsOper() && badchan.allowopers)
+ return MOD_RES_PASSTHRU;
+
+ // If the channel matches a whitelist then allow the join.
+ for (GoodChannels::const_iterator i = goodchannels.begin(); i != goodchannels.end(); ++i)
+ if (InspIRCd::Match(cname, *i))
return MOD_RES_PASSTHRU;
- }
- else
- {
- std::string reason = j->second->getString("reason");
- std::string redirect = j->second->getString("redirect");
-
- ConfigTagList goodchans = ServerInstance->Config->ConfTags("goodchan");
- for (ConfigIter i = goodchans.first; i != goodchans.second; ++i)
- {
- if (InspIRCd::Match(cname, i->second->getString("name")))
- {
- return MOD_RES_PASSTHRU;
- }
- }
-
- if (ServerInstance->IsChannel(redirect))
- {
- /* simple way to avoid potential loops: don't redirect to +L channels */
- Channel *newchan = ServerInstance->FindChan(redirect);
- if ((!newchan) || (!newchan->IsModeSet(redirectmode)))
- {
- user->WriteNumeric(926, cname, InspIRCd::Format("Channel %s is forbidden, redirecting to %s: %s", cname.c_str(), redirect.c_str(), reason.c_str()));
- Channel::JoinUser(user, redirect);
- return MOD_RES_DENY;
- }
- }
-
- user->WriteNumeric(926, cname, InspIRCd::Format("Channel %s is forbidden: %s", cname.c_str(), reason.c_str()));
- return MOD_RES_DENY;
- }
+
+ // If there is no redirect chan, the user has enabled the antiredirect mode, or
+ // the target channel redirects elsewhere we just tell the user and deny the join.
+ Channel* target = NULL;
+ if (badchan.redirect.empty() || user->IsModeSet(antiredirectmode)
+ || ((target = ServerInstance->FindChan(badchan.redirect)) && target->IsModeSet(redirectmode)))
+ {
+ user->WriteNumeric(ERR_BADCHANNEL, cname, InspIRCd::Format("Channel %s is forbidden: %s",
+ cname.c_str(), badchan.reason.c_str()));
+ return MOD_RES_DENY;
}
+
+ // Redirect the user to the target channel.
+ user->WriteNumeric(ERR_BADCHANNEL, cname, InspIRCd::Format("Channel %s is forbidden, redirecting to %s: %s",
+ cname.c_str(), badchan.redirect.c_str(), badchan.reason.c_str()));
+ Channel::JoinUser(user, badchan.redirect);
+ return MOD_RES_DENY;
}
return MOD_RES_PASSTHRU;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 07:57:36 +0000