socket.cpp

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/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  Inspire is copyright (C) 2002-2004 ChatSpike-Dev.
 *                       E-mail:
 *                <brain@chatspike.net>
 *                <Craig@chatspike.net>
 *     
 * Written by Craig Edwards, Craig McLure, and others.
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

using namespace std;

#include "inspircd_config.h"
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#include <sstream>
#include <iostream>
#include <fstream>
#include "socket.h"
#include "inspircd.h"
#include "inspircd_io.h"
#include "inspstring.h"
#include "helperfuncs.h"
#include "socketengine.h"


extern InspIRCd* ServerInstance;
extern time_t TIME;

InspSocket* socket_ref[65535];

InspSocket::InspSocket()
{
        this->state = I_DISCONNECTED;
}

InspSocket::InspSocket(int newfd, char* ip)
{
        this->fd = newfd;
        this->state = I_CONNECTED;
        this->IP = ip;
        ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_MODULE);
        socket_ref[this->fd] = this;
}

InspSocket::InspSocket(std::string host, int port, bool listening, unsigned long maxtime)
{
        if (listening) {
                if ((this->fd = OpenTCPSocket()) == ERROR)
                {
                        this->fd = -1;
                        this->state = I_ERROR;
                        this->OnError(I_ERR_SOCKET);
                        log(DEBUG,"OpenTCPSocket() error");
                        return;
                }
                else
                {
                        if (BindSocket(this->fd,this->client,this->server,port,(char*)host.c_str()) == ERROR)
                        {
                                this->Close();
                                this->fd = -1;
                                this->state = I_ERROR;
                                this->OnError(I_ERR_BIND);
                                log(DEBUG,"BindSocket() error %s",strerror(errno));
                                return;
                        }
                        else
                        {
                                this->state = I_LISTENING;
                                ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_MODULE);
                                socket_ref[this->fd] = this;
                                log(DEBUG,"New socket now in I_LISTENING state");
                                return;
                        }
                }                       
        } else {
                char* ip;
                this->host = host;
                hostent* hoste = gethostbyname(host.c_str());
                if (!hoste) {
                        ip = (char*)host.c_str();
                } else {
                        struct in_addr* ia = (in_addr*)hoste->h_addr;
                        ip = inet_ntoa(*ia);
                }

                this->IP = ip;

                timeout_end = time(NULL)+maxtime;
                timeout = false;
                if ((this->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
                {
                        this->state = I_ERROR;
                        this->OnError(I_ERR_SOCKET);
                        return;
                }
                this->port = port;
                inet_aton(ip,&addy);
                addr.sin_family = AF_INET;
                addr.sin_addr = addy;
                addr.sin_port = htons(this->port);

                int flags;
                flags = fcntl(this->fd, F_GETFL, 0);
                fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);

                if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)) == -1)
                {
                        if (errno != EINPROGRESS)
                        {
                                this->Close();
                                this->OnError(I_ERR_CONNECT);
                                this->state = I_ERROR;
                                return;
                        }
                }
                this->state = I_CONNECTING;
                ServerInstance->SE->AddFd(this->fd,false,X_ESTAB_MODULE);
                socket_ref[this->fd] = this;
                return;
        }
}

void InspSocket::Close()
{
        if (this->fd != -1)
        {
                this->OnClose();
                shutdown(this->fd,2);
                close(this->fd);
                socket_ref[this->fd] = NULL;
                this->fd = -1;
        }
}

std::string InspSocket::GetIP()
{
        return this->IP;
}

char* InspSocket::Read()
{
        int n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
        if (n > 0)
        {
                ibuf[n] = 0;
                return ibuf;
        }
        else
        {
                log(DEBUG,"EOF or error on socket");
                return NULL;
        }
}

// There are two possible outcomes to this function.
// It will either write all of the data, or an undefined amount.
// If an undefined amount is written the connection has failed
// and should be aborted.
int InspSocket::Write(std::string data)
{
        this->Buffer = this->Buffer + data;
        this->FlushWriteBuffer();
        return data.length();
}

void InspSocket::FlushWriteBuffer()
{
        int result = 0;
        if (this->Buffer.length())
        {
                result = send(this->fd,this->Buffer.c_str(),this->Buffer.length(),0);
                if (result > 0)
                {
                        /* If we wrote some, advance the buffer forwards */
                        char* n = (char*)this->Buffer.c_str();
                        n += result;
                        this->Buffer = n;
                }
        }
}

bool InspSocket::Timeout(time_t current)
{
        if ((this->state == I_CONNECTING) && (current > timeout_end))
        {
                // for non-listening sockets, the timeout can occur
                // which causes termination of the connection after
                // the given number of seconds without a successful
                // connection.
                this->OnTimeout();
                this->OnError(I_ERR_TIMEOUT);
                timeout = true;
                this->state = I_ERROR;
                return true;
        }
        if (this->Buffer.length())
                this->FlushWriteBuffer();
        return false;
}

bool InspSocket::Poll()
{
        int incoming = -1;
        
        switch (this->state)
        {
                case I_CONNECTING:
                        this->SetState(I_CONNECTED);
                        /* Our socket was in write-state, so delete it and re-add it
                         * in read-state.
                         */
                        ServerInstance->SE->DelFd(this->fd);
                        ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_MODULE);
                        return this->OnConnected();
                break;
                case I_LISTENING:
                        length = sizeof (client);
                        incoming = accept (this->fd, (sockaddr*)&client,&length);
                        this->OnIncomingConnection(incoming,inet_ntoa(client.sin_addr));
                        return true;
                break;
                case I_CONNECTED:
                        return this->OnDataReady();
                break;
                default:
                break;
        }

        return true;
}

void InspSocket::SetState(InspSocketState s)
{
        log(DEBUG,"Socket state change");
        this->state = s;
}

InspSocketState InspSocket::GetState()
{
        return this->state;
}

int InspSocket::GetFd()
{
        return this->fd;
}

bool InspSocket::OnConnected() { return true; }
void InspSocket::OnError(InspSocketError e) { return; }
int InspSocket::OnDisconnect() { return 0; }
int InspSocket::OnIncomingConnection(int newfd, char* ip) { return 0; }
bool InspSocket::OnDataReady() { return true; }
void InspSocket::OnTimeout() { return; }
void InspSocket::OnClose() { return; }

InspSocket::~InspSocket()
{
        this->Close();
}

/*
int BindSocket (int sockfd, struct sockaddr_in client, struct sockaddr_in server, int port, char* addr)
int OpenTCPSocket (void)
*/

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