From c21bdadf547274d58e6b3deb402d0fa702b43355 Mon Sep 17 00:00:00 2001
From: jamie <jamie@e03df62e-2008-0410-955e-edbf42e46eb7>
Date: Mon, 16 Oct 2006 03:07:11 +0000
Subject: Add m_dccallow module and detail configuration in
 inspircd.conf.example

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@5468 e03df62e-2008-0410-955e-edbf42e46eb7
---
 src/modules/m_dccallow.cpp | 513 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 513 insertions(+)
 create mode 100644 src/modules/m_dccallow.cpp

(limited to 'src')

diff --git a/src/modules/m_dccallow.cpp b/src/modules/m_dccallow.cpp
new file mode 100644
index 000000000..033138a98
--- /dev/null
+++ b/src/modules/m_dccallow.cpp
@@ -0,0 +1,513 @@
+ /* m_dccallow - Jamie Penman-Smithson <jamie@silverdream.org> - September 2006 */
+
+using namespace std;
+
+#include <stdio.h>
+#include <vector>
+#include <string.h>
+#include "users.h"
+#include "channels.h"
+#include "modules.h"
+#include "inspircd.h"
+
+/* $ModDesc: Povides support for the /DCCALLOW command */
+
+static ConfigReader *Conf;
+
+class BannedFileList
+{
+ public:
+    std::string filemask;
+    std::string action;
+};
+
+class DCCAllow
+{
+ public:
+    std::string nickname;
+    std::string hostmask;
+    time_t set_on;
+    long length;
+
+    DCCAllow() { }
+
+    DCCAllow(std::string nick, std::string hm, time_t so, long ln) : nickname(nick), hostmask(hm), set_on(so), length(ln) { }
+};
+
+typedef std::vector<userrec *> userlist;
+userlist ul;
+typedef std::vector<DCCAllow> dccallowlist;
+dccallowlist* dl;
+typedef std::vector<BannedFileList> bannedfilelist;
+bannedfilelist bfl;
+
+class cmd_dccallow : public command_t
+{
+ public:
+    cmd_dccallow(InspIRCd* Me) : command_t(Me, "DCCALLOW", 0, 0)
+    {
+        this->source = "m_dccallow.so";
+        syntax = "{[+|-]<nick> <time>}";
+    }
+
+    CmdResult Handle(const char **parameters, int pcnt, userrec *user)
+    {
+        /* syntax: DCCALLOW [+|-]<nick> (<time>) */
+        
+        if (!pcnt)
+        {
+            // display current DCCALLOW list
+            DisplayDCCAllowList(user);
+
+            return CMD_SUCCESS;
+        }
+        else if (pcnt > 0)
+        {
+            char action = *parameters[0];
+        
+            // if they didn't specify an action, this is probably a command
+            if (action != '+' && action != '-')
+            {
+                if (strcmp(parameters[0], "LIST") == 0 || strcmp(parameters[0], "list") == 0)
+                {
+                    // list current DCCALLOW list
+                    DisplayDCCAllowList(user);
+                    return CMD_SUCCESS;
+                } 
+                else if (strcmp(parameters[0], "HELP") == 0 || strcmp(parameters[0], "help") == 0)
+                {
+                    // display help
+                    DisplayHelp(user);
+                    return CMD_SUCCESS;
+                }
+            }
+                
+            std::string nick = parameters[0] + 1;
+            userrec *target = ServerInstance->FindNick(nick);
+
+            if (target)
+            {
+                ServerInstance->Log(DEBUG, "m_dccallow.so: got target %s and action %c", target->nick, action);
+                            
+                if (action == '-')
+                {
+                    user->GetExt("dccallow_list", dl);
+                    // check if it contains any entries
+                    if (dl)
+                    {
+                        if (dl->size())
+                        {
+                            for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
+                            {
+                                // search through list
+                                if (i->nickname == target->nick)
+                                {
+                                    dl->erase(i);
+                                    user->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", user->nick, user->nick, target->nick);
+                                    break;
+                                }
+                            }
+                        }
+                    }
+                    else
+                    {
+                        DELETE(dl);
+                        user->Shrink("dccallow_list");
+                        
+                        // remove from userlist
+                        for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
+                        {
+                            userrec* u = (userrec*)(*j);
+                            if (u->nick == user->nick)
+                            {
+                                ul.erase(j);
+                                break;
+                            }
+                        }
+                    }
+                }
+                else if (action == '+')
+                {
+                    // fetch current DCCALLOW list
+                    user->GetExt("dccallow_list", dl);
+                    // they don't have one, create it
+                    if (!dl)
+                    {
+                        dl = new dccallowlist;
+                        user->Extend(std::string("dccallow_list"), dl);
+                        // add this user to the userlist
+                        ul.push_back(user);
+                    }
+                    for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
+                    {
+                        if (k->nickname == target->nick)
+                        {
+                            user->WriteServ("996 %s %s :%s is already on your DCCALLOW list", user->nick, user->nick, target->nick);
+                            return CMD_SUCCESS;
+                        }
+                    }
+                
+                    std::string mask = std::string(target->nick)+"!"+std::string(target->ident)+"@"+std::string(target->dhost);
+                    const char* default_length = Conf->ReadValue("dccallow", "length", 0).c_str();
+
+                    long length;
+                    if (pcnt == 1 || ServerInstance->Duration(parameters[1]) < 1)
+                    {
+                        length = ServerInstance->Duration(default_length);
+                    } 
+                    else if (parameters[1] == 0)
+                    {
+                        length = 0;
+                    }
+                    else
+                    {
+                        length = ServerInstance->Duration(parameters[1]);
+                    }
+
+                    if (!ServerInstance->IsValidMask(mask.c_str()))
+                    {
+                        return CMD_FAILURE;
+                    }
+                    
+                    dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
+
+                    if (length > 0)
+                    {
+                        user->WriteServ("993 %s %s :Added %s to DCCALLOW list for %d seconds", user->nick, user->nick, target->nick, length);
+                    }
+                    else
+                    {
+                        user->WriteServ("994 %s %s :Added %s to DCCALLOW list for this session", user->nick, user->nick, target->nick);
+                    }
+                    
+                    return CMD_SUCCESS;
+                }
+            }
+            else
+            {
+                // nick doesn't exist
+                user->WriteServ("401 %s %s :No such nick/channel", user->nick, nick.c_str());
+                return CMD_FAILURE;
+            }
+        }
+    return CMD_SUCCESS;
+    }
+
+    void DisplayHelp(userrec* user)
+    {
+        user->WriteServ("998 %s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick);
+        user->WriteServ("998 %s :You may allow DCCs from specific users by specifying a", user->nick);
+        user->WriteServ("998 %s :DCC allow for the user you want to receive DCCs from.", user->nick);
+        user->WriteServ("998 %s :For example, to allow the user Brain to send you inspircd.exe", user->nick);
+        user->WriteServ("998 %s :you would type:", user->nick);
+        user->WriteServ("998 %s :/DCCALLOW +Brain", user->nick);
+        user->WriteServ("998 %s :Brain would then be able to send you files. They would have to", user->nick);
+        user->WriteServ("998 %s :resend the file again if the server gave them an error message", user->nick);
+        user->WriteServ("998 %s :before you added them to your DCCALLOW list.", user->nick);
+        user->WriteServ("998 %s :DCCALLOW entries will be temporary by default, if you want to add", user->nick);
+        user->WriteServ("998 %s :them to your DCCALLOW list until you leave IRC, type:", user->nick);
+        user->WriteServ("998 %s :/DCCALLOW +Brain 0", user->nick);
+        user->WriteServ("998 %s :To remove the user from your DCCALLOW list, type:", user->nick);
+        user->WriteServ("998 %s :/DCCALLOW -Brain", user->nick);
+        user->WriteServ("998 %s :To see the users in your DCCALLOW list, type:", user->nick);
+        user->WriteServ("998 %s :/DCCALLOW LIST", user->nick);
+        user->WriteServ("998 %s :NOTE: If the user leaves IRC or changes their nickname", user->nick);
+        user->WriteServ("998 %s :      they will be removed from your DCCALLOW list.", user->nick);
+        user->WriteServ("998 %s :      your DCCALLOW list will be deleted when you leave IRC.", user->nick);
+        user->WriteServ("999 %s :End of DCCALLOW HELP", user->nick);
+    }
+
+    void DisplayDCCAllowList(userrec* user)
+    {
+         // display current DCCALLOW list
+        user->WriteServ("990 %s :Users on your DCCALLOW list:", user->nick);
+        user->GetExt("dccallow_list", dl);
+        
+        if (dl)
+        {
+            for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
+            {
+                user->WriteServ("991 %s %s :%s (%s)", user->nick, user->nick, c->nickname.c_str(), c->hostmask.c_str());
+            }
+        }
+        
+        user->WriteServ("992 %s :End of DCCALLOW list", user->nick);
+    }                        
+
+};
+        
+class ModuleDCCAllow : public Module
+{
+    cmd_dccallow* mycommand;
+
+ public:
+    ModuleDCCAllow(InspIRCd* Me)
+        : Module::Module(Me)
+    {
+        Conf = new ConfigReader(ServerInstance);
+        mycommand = new cmd_dccallow(ServerInstance);
+        ServerInstance->AddCommand(mycommand);
+        ReadFileConf();
+    }
+
+    void Implements(char* List)
+    {
+        List[I_OnUserPreMessage] = List[I_OnUserPreNotice] = List[I_OnUserQuit] = List[I_OnUserPreNick] = List[I_OnRehash] = 1;
+    }
+
+    virtual void OnRehash(const std::string &parameter)
+    {
+                delete Conf;
+        Conf = new ConfigReader(ServerInstance);
+    }
+
+    virtual void OnUserQuit(userrec* user, const std::string &reason)
+    {
+        dccallowlist* dl;
+
+        // remove their DCCALLOW list if they have one
+        user->GetExt("dccallow_list", dl);
+        if (dl)
+        {
+            DELETE(dl);
+            user->Shrink("dccallow_list");
+            RemoveFromUserlist(user);
+        }
+        
+        // remove them from any DCCALLOW lists
+        // they are currently on
+        RemoveNick(user);
+    }
+
+
+    virtual int OnUserPreNick(userrec* user, const std::string &newnick)
+    {
+        RemoveNick(user);
+        return 0;
+    }
+    
+    virtual int OnUserPreMessage(userrec* user, void* dest, int target_type, std::string &text, char status)
+    {
+        return OnUserPreNotice(user, dest, target_type, text, status);
+    }
+
+    virtual int OnUserPreNotice(userrec* user, void* dest, int target_type, std::string &text, char status)
+    {
+        Expire();
+
+        if (target_type == TYPE_USER)
+        {
+            userrec* u = (userrec*)dest;
+            
+            if ((text.length()) && (text[0] == '\1'))
+            {
+                // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
+                // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
+                        
+                if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
+                {
+                    u->GetExt("dccallow_list", dl);
+
+                    if (dl)
+                    {
+                        if (dl->size())
+                        {
+                            for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
+                            {
+                                if (ServerInstance->MatchText(user->GetFullHost(), iter->hostmask))
+                                {
+                                    return 0;
+                                }
+                            }
+                        }
+                    }
+
+                    // tokenize
+                    stringstream ss(text);
+                    std::string buf;
+                    vector<string> tokens;
+
+                    while (ss >> buf)
+                        tokens.push_back(buf);
+
+                    std::string type = tokens[1];
+                    ServerInstance->Log(DEBUG, "m_dccallow.so: got DCC type %s", type.c_str());
+
+                    const char* blockchat = Conf->ReadValue("dccallow", "blockchat", 0).c_str();
+                    ServerInstance->Log(DEBUG, "m_dccallow.so: got blockchat: %s", blockchat);
+
+                    if (type == "SEND")
+                    {
+                        const char* defaultaction = Conf->ReadValue("dccallow", "action", 0).c_str();
+                        std::string filename = tokens[2];
+                        
+                        if (strcmp(defaultaction, "allow") == 0) 
+                        {
+                            return 0;
+                        }
+                        
+                        for (unsigned int i = 0; i < bfl.size(); i++)
+                        {
+                            if (ServerInstance->MatchText(filename, bfl[i].filemask))
+                            {
+                                if (strcmp(bfl[i].action.c_str(), "allow") == 0)
+                                {
+                                    return 0;
+                                }
+                            }
+                            else
+                            {
+                                if (strcmp(defaultaction, "allow") == 0)
+                                {
+                                    return 0;
+                                }
+                            }
+                            user->WriteServ("NOTICE %s :The user %s is not accepting DCC SENDs from you. Your file %s was not sent.", user->nick, u->nick, filename.c_str());
+                            u->WriteServ("NOTICE %s :%s (%s@%s) attempted to send you a file named %s, which was blocked.", u->nick, user->nick, user->ident, user->dhost, filename.c_str());
+                            u->WriteServ("NOTICE %s :If you trust %s and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.", u->nick, user->nick);
+                        }
+                    }
+                    else if ((type == "CHAT") && (strcmp(blockchat, "yes") == 0))
+                    {
+                        user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick, u->nick);
+                        u->WriteServ("NOTICE %s :%s (%s@%s) attempted to initiate a DCC CHAT session, which was blocked.", u->nick, user->nick, user->ident, user->dhost);
+                        u->WriteServ("NOTICE %s :If you trust %s and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.", u->nick, user->nick);
+                    }
+                    return 1;    
+                }
+            }
+        }
+        return 0;
+    }
+
+    void Expire()
+    {
+        for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
+        {
+            userrec* u = (userrec*)(*iter);
+            u->GetExt("dccallow_list", dl);
+
+            if (dl)
+            {
+                if (dl->size())
+                {
+                    dccallowlist::iterator iter = dl->begin();
+                    while (iter != dl->end())
+                    {
+                        if ((iter->set_on + iter->length) <= ServerInstance->Time())
+                        {
+                            u->WriteServ("997 %s %s :DCCALLOW entry for %s has expired", u->nick, u->nick, iter->nickname.c_str());
+                            iter = dl->erase(iter);
+                        }
+                        else
+                        {
+                            ++iter;
+                        }
+                    }
+                }
+            }
+            else
+            {
+                DELETE(dl);
+                u->Shrink("dccallow_list");
+                RemoveFromUserlist(u);
+                ServerInstance->Log(DEBUG, "m_dccallow.so: UH OH! Couldn't get DCCALLOW list for %s", u->nick);
+            }
+        }
+    }
+
+    void RemoveNick(userrec* user)
+    {
+        /* Iterate through all DCCALLOW lists and remove user */
+        for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
+        {
+            userrec *u = (userrec*)(*iter);
+            u->GetExt("dccallow_list", dl);
+
+            if (dl)
+            {
+                if (dl->size())
+                {
+                    for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
+                    {
+                        if (i->nickname == user->nick)
+                        {
+                            
+                            u->WriteServ("NOTICE %s :%s left the network or changed their nickname and has been removed from your DCCALLOW list", u->nick, i->nickname.c_str());
+                            u->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", u->nick, u->nick, i->nickname.c_str());
+                            dl->erase(i);
+                            break;
+                        }
+                    }
+                }
+            }
+            else
+            {
+                DELETE(dl);
+                u->Shrink("dccallow_list");
+                RemoveFromUserlist(u);
+            }
+        }
+    }
+
+    void RemoveFromUserlist(userrec *user)
+    {
+        // remove user from userlist
+        for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
+        {
+            userrec* u = (userrec*)(*j);
+            if (u->nick == user->nick)
+            {
+                ul.erase(j);
+                break;
+            }
+        }
+    }
+
+    void ReadFileConf()
+    {
+        bfl.clear();
+        for (int i = 0; i < Conf->Enumerate("banfile"); i++)
+        {
+            BannedFileList bf;
+            std::string fileglob = Conf->ReadValue("banfile", "pattern", i);
+            std::string action = Conf->ReadValue("banfile", "action", i);
+            bf.filemask = fileglob;
+            bf.action = action;
+            bfl.push_back(bf);
+        }
+    
+    }
+
+    virtual ~ModuleDCCAllow()
+    {
+    }
+
+    virtual Version GetVersion()
+    {
+        return Version(1,0,0,0,VF_COMMON,API_VERSION);
+    }
+};
+
+class ModuleDCCAllowFactory : public ModuleFactory
+{
+ public:
+    ModuleDCCAllowFactory()
+    {
+    }
+
+    ~ModuleDCCAllowFactory()
+    {
+    }
+
+    virtual Module * CreateModule(InspIRCd* Me)
+    {
+        return new ModuleDCCAllow(Me);
+    }
+
+};
+
+extern "C" void * init_module( void )
+{
+    return new ModuleDCCAllowFactory;
+}
-- 
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