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home » brain » inspircd-cvs » inspircd » src » modules » m_spanningtree

treesocket1.cpp

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/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
 * See: http://www.inspircd.org/wiki/index.php/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "inspircd.h"
#include "commands/cmd_whois.h"
#include "commands/cmd_stats.h"
#include "socket.h"
#include "xline.h"
#include "transport.h"
#include "m_hash.h"
#include "socketengine.h"

#include "m_spanningtree/main.h"
#include "m_spanningtree/utils.h"
#include "m_spanningtree/treeserver.h"
#include "m_spanningtree/link.h"
#include "m_spanningtree/treesocket.h"
#include "m_spanningtree/resolvers.h"
#include "m_spanningtree/handshaketimer.h"

/* $ModDep: m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_hash.h m_spanningtree/handshaketimer.h */


TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string shost, int iport, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Module* HookMod)
        : BufferedSocket(SI, shost, iport, maxtime, bindto), Utils(Util), Hook(HookMod)
{
        myhost = ServerName;
        theirchallenge.clear();
        ourchallenge.clear();
        this->LinkState = CONNECTING;
        Utils->timeoutlist[this] = std::pair<std::string, int>(ServerName, maxtime);
        if (Hook)
                BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
}

TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod)
        : BufferedSocket(SI, newfd, ip), Utils(Util), Hook(HookMod)
{
        this->LinkState = WAIT_AUTH_1;
        theirchallenge.clear();
        ourchallenge.clear();
        sentcapab = false;
        /* If we have a transport module hooked to the parent, hook the same module to this
         * socket, and set a timer waiting for handshake before we send CAPAB etc.
         */
        if (Hook)
                BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();

        ServerInstance->Timers->AddTimer(new HandshakeTimer(ServerInstance, this, &(Utils->LinkBlocks[0]), this->Utils, 1));

        /* Fix by Brain - inbound sockets need a timeout, too. 30 secs should be pleanty */
        Utils->timeoutlist[this] = std::pair<std::string, int>("<unknown>", 30);
}

ServerState TreeSocket::GetLinkState()
{
        return this->LinkState;
}

Module* TreeSocket::GetHook()
{
        return this->Hook;
}

TreeSocket::~TreeSocket()
{
        if (Hook)
                BufferedSocketUnhookRequest(this, (Module*)Utils->Creator, Hook).Send();
        Utils->timeoutlist.erase(this);
}

bool TreeSocket::OnConnected()
{
        if (this->LinkState == CONNECTING)
        {
                /* we do not need to change state here. */
                for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
                {
                        if (x->Name == this->myhost)
                        {
                                Utils->Creator->RemoteMessage(NULL,"Connection to \2%s\2[%s] started.", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->GetIP().c_str()));
                                if (Hook)
                                {
                                        BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
                                        Utils->Creator->RemoteMessage(NULL,"Connection to \2%s\2[%s] using transport \2%s\2", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->GetIP().c_str()),
                                                        x->Hook.c_str());
                                }
                                this->OutboundPass = x->SendPass;
                                sentcapab = false;

                                /* found who we're supposed to be connecting to, send the neccessary gubbins. */
                                if (this->GetHook())
                                        ServerInstance->Timers->AddTimer(new HandshakeTimer(ServerInstance, this, &(*x), this->Utils, 1));
                                else
                                        this->SendCapabilities();

                                return true;
                        }
                }
        }
        /* There is a (remote) chance that between the /CONNECT and the connection
         * being accepted, some muppet has removed the <link> block and rehashed.
         * If that happens the connection hangs here until it's closed. Unlikely
         * and rather harmless.
         */
        this->Utils->Creator->RemoteMessage(NULL,"Connection to \2%s\2 lost link tag(!)", myhost.c_str());
        return true;
}

void TreeSocket::OnError(BufferedSocketError e)
{
        Link* MyLink;

        switch (e)
        {
                case I_ERR_CONNECT:
                        Utils->Creator->RemoteMessage(NULL,"Connection failed: Connection to \002%s\002 refused", myhost.c_str());
                        MyLink = Utils->FindLink(myhost);
                        if (MyLink)
                                Utils->DoFailOver(MyLink);
                break;
                case I_ERR_SOCKET:
                        Utils->Creator->RemoteMessage(NULL,"Connection failed: Could not create socket (%s)", strerror(errno));
                break;
                case I_ERR_BIND:
                        Utils->Creator->RemoteMessage(NULL,"Connection failed: Error binding socket to address or port (%s)", strerror(errno));
                break;
                case I_ERR_WRITE:
                        Utils->Creator->RemoteMessage(NULL,"Connection failed: I/O error on connection (%s)", errno ? strerror(errno) : "Connection closed unexpectedly");
                break;
                case I_ERR_NOMOREFDS:
                        Utils->Creator->RemoteMessage(NULL,"Connection failed: Operating system is out of file descriptors!");
                break;
                default:
                        if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
                                Utils->Creator->RemoteMessage(NULL,"Connection to \002%s\002 failed with OS error: %s", myhost.c_str(), strerror(errno));
                break;
        }
}

int TreeSocket::OnDisconnect()
{
        /* For the same reason as above, we don't
         * handle OnDisconnect()
         */
        return true;
}

void TreeSocket::SendError(const std::string &errormessage)
{
        /* Display the error locally as well as sending it remotely */
        Utils->Creator->RemoteMessage(NULL, "Sent \2ERROR\2 to %s: %s", (this->InboundServerName.empty() ? this->GetIP().c_str() : this->InboundServerName.c_str()), errormessage.c_str());
        this->WriteLine("ERROR :"+errormessage);
        /* One last attempt to make sure the error reaches its target */
        this->FlushWriteBuffer();
}

void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
{
        /* recursively squit the servers attached to 'Current'.
         * We're going backwards so we don't remove users
         * while we still need them ;)
         */
        for (unsigned int q = 0; q < Current->ChildCount(); q++)
        {
                TreeServer* recursive_server = Current->GetChild(q);
                this->SquitServer(from,recursive_server);
        }
        /* Now we've whacked the kids, whack self */
        num_lost_servers++;
        num_lost_users += Current->QuitUsers(from);
}

void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
{
        if ((Current) && (Current != Utils->TreeRoot))
        {
                Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server");
                rmode.Send(ServerInstance);

                std::deque<std::string> params;
                params.push_back(Current->GetName());
                params.push_back(":"+reason);
                Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
                if (Current->GetParent() == Utils->TreeRoot)
                {
                        this->ServerInstance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split: "+reason);
                }
                else
                {
                        this->ServerInstance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
                }
                num_lost_servers = 0;
                num_lost_users = 0;
                std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
                SquitServer(from, Current);
                Current->Tidy();
                Current->GetParent()->DelChild(Current);
                delete Current;
                this->ServerInstance->SNO->WriteToSnoMask('l',"Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
        }
        else
                ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
}

bool TreeSocket::OnDataReady()
{
        const char* data = this->Read();
        /* Check that the data read is a valid pointer and it has some content */
        if (data && *data)
        {
                this->in_buffer.append(data);
                /* While there is at least one new line in the buffer,
                 * do something useful (we hope!) with it.
                 */
                while (in_buffer.find("\n") != std::string::npos)
                {
                        std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1);
                        in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n"));
                        /* Use rfind here not find, as theres more
                         * chance of the \r being near the end of the
                         * string, not the start.
                         */
                        if (ret.find("\r") != std::string::npos)
                                ret = in_buffer.substr(0,in_buffer.find("\r")-1);
                        /* Process this one, abort if it
                         * didnt return true.
                         */
                        if (!this->ProcessLine(ret))
                        {
                                return false;
                        }
                }
                return true;
        }
        /* EAGAIN returns an empty but non-NULL string, so this
         * evaluates to TRUE for EAGAIN but to FALSE for EOF.
         */
        return (data && !*data);
}