Add part-finished m_cgiirc module for Brain to play with

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@4362 e03df62e-2008-0410-955e-edbf42e46eb7

1 files changed, 367 insertions, 0 deletions

diff --git a/src/modules/m_cgiirc.cpp b/src/modules/m_cgiirc.cpp
new file mode 100644
index 000000000..6eb3f877c
--- /dev/null
+++ b/src/modules/m_cgiirc.cpp
@@ -0,0 +1,367 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd is copyright (C) 2002-2004 ChatSpike-Dev.
+ *                       E-mail:
+ *               <brain@chatspike.net>
+ *           	  <Craig@chatspike.net>
+ *               <omster@gmail.com>
+ *     
+ * Written by Craig Edwards, Craig McLure, and others.
+ * This program is free but copyrighted software; see
+ *            the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
+#include <vector>
+#include <string>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include "users.h"
+#include "modules.h"
+#include "helperfuncs.h"
+
+/* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
+
+enum CGItype { PASS, IDENT, PASSFIRST, IDENTFIRST };
+
+class CGIhost
+{
+public:
+	std::string hostmask;
+	CGItype type;
+
+	CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST)
+	: hostmask(mask), type(t)
+	{
+	}
+};
+
+typedef std::vector<CGIhost> CGIHostlist;
+
+class ModuleCgiIRC : public Module
+{
+	Server *Srv;
+	bool NotifyOpers;
+	CGIHostlist Hosts;
+public:
+	ModuleCgiIRC(Server* Me) : Module::Module(Me)
+	{
+		Srv = Me;
+		OnRehash("");
+	}
+
+	void Implements(char* List)
+	{
+		List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = 1;
+	}
+	
+	virtual Priority Prioritize()
+	{
+		// We want to get here before m_cloaking and m_hostchange etc
+		return PRIORITY_FIRST;
+	}
+
+	virtual void OnRehash(const std::string &parameter)
+	{
+		ConfigReader Conf;
+		
+		NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0);	// If we send an oper notice when a CGI:IRC has their host changed.
+		
+		if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
+			NotifyOpers = true;
+		
+		for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
+		{
+			std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
+			std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
+			
+			if(hostmask.length())
+			{
+				Hosts.push_back(CGIhost(hostmask));
+				
+				if(type == "pass")
+					Hosts.back().type = PASS;
+				else if(type == "ident")
+					Hosts.back().type = IDENT;
+				else if(type == "passfirst")
+					Hosts.back().type = PASSFIRST;
+			}
+			else
+			{
+				log(DEBUG, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
+				continue;
+			}
+		}
+	}
+
+	virtual void OnCleanup(int target_type, void* item)
+	{
+		if(target_type == TYPE_USER)
+		{
+			userrec* user = (userrec*)item;
+			std::string* realhost;
+			std::string* realip;
+			
+			if(user->GetExt("cgiirc_realhost", realhost))
+			{
+				delete realhost;
+				user->Shrink("cgiirc_realhost");
+			}
+			
+			if(user->GetExt("cgiirc_realip", realip))
+			{
+				delete realip;
+				user->Shrink("cgiirc_realip");
+			}
+		}
+	}
+	
+	virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
+	{
+		if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
+		{
+			std::string* data;
+			
+			if(user->GetExt(extname, data))
+			{
+				proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
+			}
+		}
+	}
+
+	virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
+	{
+		if(target_type == TYPE_USER)
+		{
+			userrec* dest = (userrec*)target;
+			std::string* bleh;
+			if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
+			{
+				dest->Extend(extname, new std::string(extdata));
+			}
+		}
+	}
+
+	virtual void OnUserQuit(userrec* user, const std::string &message)
+	{
+		OnCleanup(TYPE_USER, user);
+	}
+	
+
+	virtual void OnUserRegister(userrec* user)
+	{
+		log(DEBUG, "m_cgiirc.so: User %s registering", user->nick);
+		
+		for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
+		{
+			log(DEBUG, "m_cgiirc.so: Matching %s against (%s or %s)", iter->hostmask.c_str(), user->host, inet_ntoa(user->ip4));
+			
+			if(Srv->MatchText(user->host, iter->hostmask) || Srv->MatchText(inet_ntoa(user->ip4), iter->hostmask))
+			{
+				// Deal with it...
+				log(DEBUG, "m_cgiirc.so: Handling CGI:IRC user: %s (%s) matched %s", user->GetFullRealHost(), inet_ntoa(user->ip4), iter->hostmask.c_str());
+				
+				if(iter->type == PASS)
+				{
+					CheckPass(user); // We do nothing if it fails so...
+				}
+				else if(iter->type == PASSFIRST && !CheckPass(user))
+				{
+					// If the password lookup failed, try the ident
+					CheckIdent(user);	// If this fails too, do nothing
+				}
+				else if(iter->type == IDENT)
+				{
+					CheckIdent(user); // Nothing on failure.
+				}
+				else if(iter->type == IDENTFIRST && !CheckIdent(user))
+				{
+					// If the ident lookup fails, try the password.
+					CheckPass(user);
+				}
+				
+				return;
+			}
+		}
+	}
+
+	bool CheckPass(userrec* user)
+	{
+		log(DEBUG, "m_cgiirc.so: CheckPass(%s) - %s", user->nick, user->password);
+		
+		if(IsValidHost(user->password))
+		{
+			user->Extend("cgiirc_realhost", new std::string(user->host));
+			user->Extend("cgiirc_realip", new std::string(inet_ntoa(user->ip4)));
+			strlcpy(user->host, user->password, 64);
+			strlcpy(user->dhost, user->password, 64);
+			
+			if(inet_aton(user->password, &user->ip4))
+			{
+				/* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
+				log(DEBUG, "m_cgiirc.so: Got an IP in the user's password");
+			}
+			else
+			{
+				/* We got as resolved hostname in the password. */
+				inet_aton("0.0.0.0", &user->ip4);
+				log(DEBUG, "m_cgiirc.so: Got a hostname in the user's password");
+			}
+			
+			*user->password = 0;
+
+			if(NotifyOpers)
+				WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
+
+			return true;
+		}
+		else
+		{
+			log(DEBUG, "m_cgiirc.so: User's password was not a valid host");
+		}
+		
+		return false;
+	}
+	
+	bool CheckIdent(userrec* user)
+	{
+		int ip[4];
+		char* ident;
+		char newip[16];
+		int len = strlen(user->ident);
+		
+		if(len == 8)
+			ident = user->ident;
+		else if(len == 9 && *user->ident == '~')
+			ident = user->ident+1;
+		else
+			return false;
+	
+		for(int i = 0; i < 4; i++)
+			if(!HexToInt(ip[i], ident + i*2))
+				return false;
+
+		snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
+			
+		user->Extend("cgiirc_realhost", new std::string(user->host));
+		user->Extend("cgiirc_realip", new std::string(inet_ntoa(user->ip4)));
+		inet_aton(newip, &user->ip4);
+		strlcpy(user->host, newip, 16);
+		strlcpy(user->dhost, newip, 16);
+		strlcpy(user->ident, "~cgiirc", 8);
+		
+		if(NotifyOpers)
+			WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from ident", user->nick, user->host, newip);
+
+		return true;
+	}
+	
+	bool IsValidHost(const std::string &host)
+	{
+		if(!host.size())
+			return false;
+	
+		for(unsigned int i = 0; i < host.size(); i++)
+		{
+			if(	((host[i] >= '0') && (host[i] <= '9')) ||
+					((host[i] >= 'A') && (host[i] <= 'Z')) ||
+					((host[i] >= 'a') && (host[i] <= 'z')) ||
+					((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
+					((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
+					
+				continue;
+			else
+				return false;
+		}
+		
+		return true;
+	}
+
+	bool IsValidIP(const std::string &ip)
+	{
+		if(ip.size() < 7 || ip.size() > 15)
+			return false;
+	
+		short sincedot = 0;
+		short dots = 0;
+	
+		for(unsigned int i = 0; i < ip.size(); i++)
+		{
+			if((dots <= 3) && (sincedot <= 3))
+			{
+				if((ip[i] >= '0') && (ip[i] <= '9'))
+				{
+					sincedot++;
+				}
+				else if(ip[i] == '.')
+				{
+					sincedot = 0;
+					dots++;
+				}
+			}
+			else
+			{
+				return false;
+			
+			}
+		}
+		
+		if(dots != 3)
+			return false;
+		
+		return true;
+	}
+	
+	bool HexToInt(int &out, const char* in)
+	{
+		char ip[3];
+		ip[0] = in[0];
+		ip[1] = in[1];
+		ip[2] = 0;
+		out = strtol(ip, NULL, 16);
+		
+		if(out > 255 || out < 0)
+			return false;
+
+		return true;
+	}
+	
+	virtual ~ModuleCgiIRC()
+	{
+	}
+	 
+	virtual Version GetVersion()
+	{
+		return Version(1,0,0,0,VF_VENDOR);
+	}
+	
+};
+
+class ModuleCgiIRCFactory : public ModuleFactory
+{
+ public:
+	ModuleCgiIRCFactory()
+	{
+	}
+	
+	~ModuleCgiIRCFactory()
+	{
+	}
+	
+	virtual Module * CreateModule(Server* Me)
+	{
+		return new ModuleCgiIRC(Me);
+	}
+	
+};
+
+
+extern "C" void * init_module( void )
+{
+	return new ModuleCgiIRCFactory;
+}