tftpd.cpp

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/**************************************************************************
*   Copyright (C) 2005 by Achal Dhir                                      *
*   achaldhir@gmail.com                                                   *
*                                                                         *
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU General Public License as published by  *
*   the Free Software Foundation; either version 2 of the License, or     *
*   (at your option) any later version.                                   *
*                                                                         *
*   This program is distributed in the hope that it will be useful,       *
*   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
*   GNU General Public License for more details.                          *
*                                                                         *
*   You should have received a copy of the GNU General Public License     *
*   along with this program; if not, write to the                         *
*   Free Software Foundation, Inc.,                                       *
*   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
***************************************************************************/
// TFTPServer.cpp

#include <stdio.h>
#include <winsock2.h>
#include <process.h>
#include <time.h>
#include <tchar.h>
#include <ws2tcpip.h>
#include <limits.h>
#include <iphlpapi.h>
#include "tftpd.h"

//Global Variables
char serviceName[] = "TFTPServer";
char displayName[] = "TFTP Server Multithreaded";
char sVersion[] = "TFTP Server MultiThreaded Version 1.61 Windows Built 1611";
char iniFile[_MAX_PATH];
char logFile[_MAX_PATH];
char tempbuff[256];
char logBuff[512];
char fileSep = '\\';
char notFileSep = '/';
WORD blksize = 65464;
char verbatim = 0;
WORD timeout = 3;
data2 cfig;
//ThreadPool Variables
HANDLE tEvent;
HANDLE cEvent;
HANDLE sEvent;
HANDLE lEvent;
BYTE currentServer = UCHAR_MAX;
WORD totalThreads=0;
WORD minThreads=1;
WORD activeThreads=0;

//Service Variables
SERVICE_STATUS serviceStatus;
SERVICE_STATUS_HANDLE serviceStatusHandle = 0;
HANDLE stopServiceEvent = 0;

void WINAPI ServiceControlHandler(DWORD controlCode)
{
    switch (controlCode)
    {
        case SERVICE_CONTROL_INTERROGATE:
            break;

        case SERVICE_CONTROL_SHUTDOWN:
        case SERVICE_CONTROL_STOP:
            serviceStatus.dwCurrentState = SERVICE_STOP_PENDING;
            SetServiceStatus(serviceStatusHandle, &serviceStatus);

            SetEvent(stopServiceEvent);
            return ;

        case SERVICE_CONTROL_PAUSE:
            break;

        case SERVICE_CONTROL_CONTINUE:
            break;

        default:
            if (controlCode >= 128 && controlCode <= 255)
                break;
            else
                break;
    }

    SetServiceStatus(serviceStatusHandle, &serviceStatus);
}

void WINAPI ServiceMain(DWORD /*argc*/, TCHAR* /*argv*/[])
{
    serviceStatus.dwServiceType = SERVICE_WIN32;
    serviceStatus.dwCurrentState = SERVICE_STOPPED;
    serviceStatus.dwControlsAccepted = 0;
    serviceStatus.dwWin32ExitCode = NO_ERROR;
    serviceStatus.dwServiceSpecificExitCode = NO_ERROR;
    serviceStatus.dwCheckPoint = 0;
    serviceStatus.dwWaitHint = 0;

    serviceStatusHandle = RegisterServiceCtrlHandler(serviceName, ServiceControlHandler);

    if (serviceStatusHandle)
    {
        serviceStatus.dwCurrentState = SERVICE_START_PENDING;
        SetServiceStatus(serviceStatusHandle, &serviceStatus);

        //init
        verbatim = false;
        init();
        fd_set readfds;
        timeval tv;
        tv.tv_sec = 20;
        tv.tv_usec = 0;

        stopServiceEvent = CreateEvent(0, FALSE, FALSE, 0);

        serviceStatus.dwControlsAccepted |= (SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN);
        serviceStatus.dwCurrentState = SERVICE_RUNNING;
        SetServiceStatus(serviceStatusHandle, &serviceStatus);

        do
        {
            FD_ZERO(&readfds);

            for (int i = 0; i < MAX_SERVERS && cfig.tftpConn[i].port; i++)
                FD_SET(cfig.tftpConn[i].sock, &readfds);

            int fdsReady = select(cfig.maxFD, &readfds, NULL, NULL, &tv);

            for (int i = 0; fdsReady > 0 && i < MAX_SERVERS && cfig.tftpConn[i].port; i++)
            {
                if (FD_ISSET(cfig.tftpConn[i].sock, &readfds))
                {
                    WaitForSingleObject(sEvent, INFINITE);

                    currentServer = i;

                    if (!totalThreads || activeThreads >= totalThreads)
                    {
                        _beginthread(
                              processRequest,                 // thread function
                              0,                            // default security attributes
                              NULL);                          // argument to thread function

                    }

                    SetEvent(tEvent);
                    WaitForSingleObject(sEvent, INFINITE);
                    fdsReady--;
                    SetEvent(sEvent);
                }
            }
        }
        while (WaitForSingleObject(stopServiceEvent, 0) == WAIT_TIMEOUT);

        if (cfig.logfile)
            fclose(cfig.logfile);

        serviceStatus.dwCurrentState = SERVICE_STOP_PENDING;
        SetServiceStatus(serviceStatusHandle, &serviceStatus);

        sprintf(logBuff, "Closing Network Connections...");
        logMess(logBuff, 1);

        for (int i = 0; i < MAX_SERVERS && cfig.tftpConn[i].port; i++)
            closesocket(cfig.tftpConn[i].sock);

        WSACleanup();

        sprintf(logBuff, "TFTP Server Stopped !");
        logMess(logBuff, 1);

        serviceStatus.dwControlsAccepted &= ~(SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN);
        serviceStatus.dwCurrentState = SERVICE_STOPPED;
        SetServiceStatus(serviceStatusHandle, &serviceStatus);
        CloseHandle(stopServiceEvent);
        stopServiceEvent = 0;
    }
}

void runService()
{
    SERVICE_TABLE_ENTRY serviceTable[] =
        {
            {serviceName, ServiceMain},
            {0, 0}
        };

    StartServiceCtrlDispatcher(serviceTable);
}

bool stopService(SC_HANDLE service)
{
    if (service)
    {
        SERVICE_STATUS serviceStatus;
        QueryServiceStatus(service, &serviceStatus);
        if (serviceStatus.dwCurrentState != SERVICE_STOPPED)
        {
            ControlService(service, SERVICE_CONTROL_STOP, &serviceStatus);
            printf("Stopping Service.");
            for (int i = 0; i < 100; i++)
            {
                QueryServiceStatus(service, &serviceStatus);
                if (serviceStatus.dwCurrentState == SERVICE_STOPPED)
                {
                    printf("Stopped\n");
                    return true;
                }
                else
                {
                    Sleep(500);
                    printf(".");
                }
            }
            printf("Failed\n");
            return false;
        }
    }
    return true;
}

void installService()
{
    SC_HANDLE serviceControlManager = OpenSCManager(0, 0, SC_MANAGER_CREATE_SERVICE);

    if (serviceControlManager)
    {
        SC_HANDLE service = OpenService(serviceControlManager,
                                        serviceName, SERVICE_QUERY_STATUS);
        if (service)
        {
            printf("Service Already Exists..\n");
            StartService(service,0,NULL);
            CloseServiceHandle(service);
        }
        else
        {
            TCHAR path[ _MAX_PATH + 1 ];
            if (GetModuleFileName(0, path, sizeof(path) / sizeof(path[0])) > 0)
            {
                SC_HANDLE service = CreateService(serviceControlManager,
                                                  serviceName, displayName,
                                                  SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS,
                                                  SERVICE_AUTO_START, SERVICE_ERROR_IGNORE, path,
                                                  0, 0, 0, 0, 0);
                if (service)
                {
                    printf("Successfully installed.. !\n");
                    StartService(service,0,NULL);
                    CloseServiceHandle(service);
                }
                else
                    printf("Installation Failed..\n");
            }
        }
        CloseServiceHandle(serviceControlManager);
    }
    else
        printWindowsError();
}

void uninstallService()
{
    SC_HANDLE serviceControlManager = OpenSCManager(0, 0, SC_MANAGER_CONNECT);

    if (serviceControlManager)
    {
        SC_HANDLE service = OpenService(serviceControlManager,
                                        serviceName, SERVICE_QUERY_STATUS | SERVICE_STOP | DELETE);
        if (service)
        {
            if (stopService(service))
            {
                DeleteService(service);
                printf("Successfully Removed !\n");
            }
            else
                printf("Failed to Stop Service..\n");

            CloseServiceHandle(service);
        }

        CloseServiceHandle(serviceControlManager);
    }
    else
        printWindowsError();
}

void printWindowsError()
{
    DWORD dw = GetLastError();

    if (dw)
    {
        LPVOID lpMsgBuf;

        FormatMessage(
            FORMAT_MESSAGE_ALLOCATE_BUFFER |
            FORMAT_MESSAGE_FROM_SYSTEM |
            FORMAT_MESSAGE_IGNORE_INSERTS,
            NULL,
            dw,
            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
            (LPTSTR) &lpMsgBuf,
            0, NULL );

        _tprintf(_T("Error: %s\nPress Enter..\n"), (LPTSTR)lpMsgBuf);
        getchar();

        if(lpMsgBuf)
            LocalFree(lpMsgBuf);
    }
}

int main(int argc, TCHAR* argv[])
{
    OSVERSIONINFO osvi;
    osvi.dwOSVersionInfoSize = sizeof(osvi);
    bool result = GetVersionEx(&osvi);

    if (result && osvi.dwPlatformId >= VER_PLATFORM_WIN32_NT)
    {
        if (argc > 1 && lstrcmpi(argv[1], TEXT("-i")) == 0)
            installService();
        else if (argc > 1 && lstrcmpi(argv[1], TEXT("-u")) == 0)
            uninstallService();
        else if (argc > 1 && lstrcmpi(argv[1], TEXT("-v")) == 0)
        {
            SC_HANDLE serviceControlManager = OpenSCManager(0, 0, SC_MANAGER_CONNECT);
            bool serviceStopped = true;

            if (serviceControlManager)
            {
                SC_HANDLE service = OpenService(serviceControlManager,
                                                serviceName, SERVICE_QUERY_STATUS | SERVICE_STOP);
                if (service)
                {
                    serviceStopped = stopService(service);
                    CloseServiceHandle(service);
                }
                CloseServiceHandle(serviceControlManager);
            }
            else
                printWindowsError();

            if (serviceStopped)
                runProg();
            else
                printf("Failed to Stop Service\n");
        }
        else
            runService();
    }
    else if (argc == 1 || lstrcmpi(argv[1], TEXT("-v")) == 0)
        runProg();
    else
        printf("This option is not available on Windows95/98/ME\n");

    return 0;
}

void runProg()
{
    verbatim = true;
    init();
    fd_set readfds;
    timeval tv;
    int fdsReady = 0;
    tv.tv_sec = 20;
    tv.tv_usec = 0;

    printf("\naccepting requests..\n");

    do
    {
        //printf("Active=%u Total=%u\n",activeThreads, totalThreads);

        FD_ZERO(&readfds);

        for (int i = 0; i < MAX_SERVERS && cfig.tftpConn[i].port; i++)
            FD_SET(cfig.tftpConn[i].sock, &readfds);

        fdsReady = select(cfig.maxFD, &readfds, NULL, NULL, &tv);

        //if (errno)
        //    printf("%s\n", strerror(errno));

        for (int i = 0; fdsReady > 0 && i < MAX_SERVERS && cfig.tftpConn[i].port; i++)
        {
            if (FD_ISSET(cfig.tftpConn[i].sock, &readfds))
            {
                //printf("Request Waiting\n");

                WaitForSingleObject(sEvent, INFINITE);

                currentServer = i;

                if (!totalThreads || activeThreads >= totalThreads)
                {
                    _beginthread(
                          processRequest,                 // thread function
                          0,                            // default security attributes
                          NULL);                          // argument to thread function
                }
                SetEvent(tEvent);

                //printf("thread signalled=%u\n",SetEvent(tEvent));

                WaitForSingleObject(sEvent, INFINITE);
                fdsReady--;
                SetEvent(sEvent);
            }
        }
    }
    while (true);

    for (int i = 0; i < MAX_SERVERS && cfig.tftpConn[i].port; i++)
        closesocket(cfig.tftpConn[i].sock);

    WSACleanup();
}

void processRequest(void *lpParam)
{
    //printf("New Thread %u\n",GetCurrentThreadId());

    request req;

    WaitForSingleObject(cEvent, INFINITE);
    totalThreads++;
    SetEvent(cEvent);

    do
    {
        WaitForSingleObject(tEvent, INFINITE);
        //printf("In Thread %u\n",GetCurrentThreadId());

        WaitForSingleObject(cEvent, INFINITE);
        activeThreads++;
        SetEvent(cEvent);

        if (currentServer >= MAX_SERVERS || !cfig.tftpConn[currentServer].port)
        {
            SetEvent(sEvent);
            req.attempt = UCHAR_MAX;
            continue;
        }

        memset(&req, 0, sizeof(request));
        req.sock = INVALID_SOCKET;

        req.clientsize = sizeof(req.client);
        req.sockInd = currentServer;
        currentServer = UCHAR_MAX;
        req.knock = cfig.tftpConn[req.sockInd].sock;

        if (req.knock == INVALID_SOCKET)
        {
            SetEvent(sEvent);
            req.attempt = UCHAR_MAX;
            continue;
        }

        errno = 0;
        req.bytesRecd = recvfrom(req.knock, (char*)&req.mesin, sizeof(message), 0, (sockaddr*)&req.client, &req.clientsize);
        errno = WSAGetLastError();

        //printf("socket Signalled=%u\n",SetEvent(sEvent));
        SetEvent(sEvent);

        if (!errno && req.bytesRecd > 0)
        {
            if (cfig.hostRanges[0].rangeStart)
            {
                DWORD iip = ntohl(req.client.sin_addr.s_addr);
                bool allowed = false;

                for (int j = 0; j <= 32 && cfig.hostRanges[j].rangeStart; j++)
                {
                    if (iip >= cfig.hostRanges[j].rangeStart && iip <= cfig.hostRanges[j].rangeEnd)
                    {
                        allowed = true;
                        break;
                    }
                }

                if (!allowed)
                {
                    req.serverError.opcode = htons(5);
                    req.serverError.errorcode = htons(2);
                    strcpy(req.serverError.errormessage, "Access Denied");
                    logMess(&req, 1);
                    sendto(req.knock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0, (sockaddr*)&req.client, req.clientsize);
                    req.attempt = UCHAR_MAX;
                    continue;
                }
            }

            if ((htons(req.mesin.opcode) == 5))
            {
                sprintf(req.serverError.errormessage, "Error Code %i at Client, %s", ntohs(req.clientError.errorcode), req.clientError.errormessage);
                logMess(&req, 2);
                req.attempt = UCHAR_MAX;
                continue;
            }
            else if (htons(req.mesin.opcode) != 1 && htons(req.mesin.opcode) != 2)
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(5);
                sprintf(req.serverError.errormessage, "Unknown Transfer Id");
                logMess(&req, 2);
                sendto(req.knock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0, (sockaddr*)&req.client, req.clientsize);
                req.attempt = UCHAR_MAX;
                continue;
            }
        }
        else
        {
            sprintf(req.serverError.errormessage, "Communication Error");
            logMess(&req, 1);
            req.attempt = UCHAR_MAX;
            continue;
        }

        req.blksize = 512;
        req.timeout = timeout;
        req.expiry = time(NULL) + req.timeout;
        bool fetchAck = false;

        req.sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);

        if (req.sock == INVALID_SOCKET)
        {
            req.serverError.opcode = htons(5);
            req.serverError.errorcode = htons(0);
            strcpy(req.serverError.errormessage, "Thread Socket Creation Error");
            sendto(req.knock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0, (sockaddr*)&req.client, req.clientsize);
            logMess(&req, 1);
            req.attempt = UCHAR_MAX;
            continue;
        }

        sockaddr_in service;
        service.sin_family = AF_INET;
        service.sin_addr.s_addr = cfig.tftpConn[req.sockInd].server;

        if (cfig.minport)
        {
            for (WORD comport = cfig.minport; ; comport++)
            {
                service.sin_port = htons(comport);

                if (comport > cfig.maxport)
                {
                    req.serverError.opcode = htons(5);
                    req.serverError.errorcode = htons(0);
                    strcpy(req.serverError.errormessage, "No port is free");
                    sendto(req.knock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0, (sockaddr*)&req.client, req.clientsize);
                    logMess(&req, 1);
                    req.attempt = UCHAR_MAX;
                    break;
                }
                else if (bind(req.sock, (sockaddr*) &service, sizeof(service)) == -1)
                    continue;
                else
                    break;
            }
        }
        else
        {
            service.sin_port = 0;

            if (bind(req.sock, (sockaddr*) &service, sizeof(service)) == -1)
            {
                strcpy(req.serverError.errormessage, "Thread failed to bind");
                sendto(req.knock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0, (sockaddr*)&req.client, req.clientsize);
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
            }
        }

        if (req.attempt >= 3)
            continue;

        if (connect(req.sock, (sockaddr*)&req.client, req.clientsize) == -1)
        {
            req.serverError.opcode = htons(5);
            req.serverError.errorcode = htons(0);
            strcpy(req.serverError.errormessage, "Connect Failed");
            sendto(req.knock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0, (sockaddr*)&req.client, req.clientsize);
            logMess(&req, 1);
            req.attempt = UCHAR_MAX;
            continue;
        }

        //sprintf(req.serverError.errormessage, "In Temp, Socket");
        //logMess(&req, 1);

        char *inPtr = req.mesin.buffer;
        *(inPtr + (req.bytesRecd - 3)) = 0;
        req.filename = inPtr;

        if (!strlen(req.filename) || strlen(req.filename) > UCHAR_MAX)
        {
            req.serverError.opcode = htons(5);
            req.serverError.errorcode = htons(4);
            strcpy(req.serverError.errormessage, "Malformed Request, Invalid/Missing Filename");
            send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
            req.attempt = UCHAR_MAX;
            logMess(&req, 1);
            continue;
        }

        inPtr += strlen(inPtr) + 1;
        req.mode = inPtr;

        if (!strlen(req.mode) || strlen(req.mode) > 25)
        {
            req.serverError.opcode = htons(5);
            req.serverError.errorcode = htons(4);
            strcpy(req.serverError.errormessage, "Malformed Request, Invalid/Missing Mode");
            send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
            req.attempt = UCHAR_MAX;
            logMess(&req, 1);
            continue;
        }

        inPtr += strlen(inPtr) + 1;

        for (DWORD i = 0; i < strlen(req.filename); i++)
            if (req.filename[i] == notFileSep)
                req.filename[i] = fileSep;

        tempbuff[0] = '.';
        tempbuff[1] = '.';
        tempbuff[2] = fileSep;
        tempbuff[3] = 0;

        if (strstr(req.filename, tempbuff))
        {
            req.serverError.opcode = htons(5);
            req.serverError.errorcode = htons(2);
            strcpy(req.serverError.errormessage, "Access violation");
            send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
            logMess(&req, 1);
            req.attempt = UCHAR_MAX;
            continue;
        }

        if (req.filename[0] == fileSep)
            req.filename++;

        if (!cfig.homes[0].alias[0])
        {
            if (strlen(cfig.homes[0].target) + strlen(req.filename) >= sizeof(req.path))
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(4);
                sprintf(req.serverError.errormessage, "Filename too large");
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }

            strcpy(req.path, cfig.homes[0].target);
            strcat(req.path, req.filename);
        }
        else
        {
            char *bname = strchr(req.filename, fileSep);

            if (bname)
            {
                *bname = 0;
                bname++;
            }
            else
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(2);
                sprintf(req.serverError.errormessage, "Missing directory/alias");
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }

            for (int i = 0; i < 8; i++)
            {
                //printf("%s=%i\n", req.filename, cfig.homes[i].alias[0]);
                if (cfig.homes[i].alias[0] && !strcasecmp(req.filename, cfig.homes[i].alias))
                {
                    if (strlen(cfig.homes[i].target) + strlen(bname) >= sizeof(req.path))
                    {
                        req.serverError.opcode = htons(5);
                        req.serverError.errorcode = htons(4);
                        sprintf(req.serverError.errormessage, "Filename too large");
                        send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                        logMess(&req, 1);
                        req.attempt = UCHAR_MAX;
                        break;
                    }

                    strcpy(req.path, cfig.homes[i].target);
                    strcat(req.path, bname);
                    break;
                }
                else if (i == 7 || !cfig.homes[i].alias[0])
                {
                    req.serverError.opcode = htons(5);
                    req.serverError.errorcode = htons(2);
                    sprintf(req.serverError.errormessage, "No such directory/alias %s", req.filename);
                    send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                    logMess(&req, 1);
                    req.attempt = UCHAR_MAX;
                    break;
                }
            }
        }

        if (req.attempt >= 3)
            continue;

        if (ntohs(req.mesin.opcode) == 1)
        {
            if (!cfig.fileRead)
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(2);
                strcpy(req.serverError.errormessage, "GET Access Denied");
                logMess(&req, 1);
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                req.attempt = UCHAR_MAX;
                continue;
            }

            if (*inPtr)
            {
                char *tmp = inPtr;

                while (*tmp)
                {
                    if (!strcasecmp(tmp, "blksize"))
                    {
                        tmp += strlen(tmp) + 1;
                        DWORD val = atol(tmp);

                        if (val < 512)
                            val = 512;
                        else if (val > blksize)
                            val = blksize;

                        req.blksize = val;
                        break;
                    }

                    tmp += strlen(tmp) + 1;
                }
            }

            errno = 0;

            if (!strcasecmp(req.mode, "netascii") || !strcasecmp(req.mode, "ascii"))
                req.file = fopen(req.path, "rt");
            else
                req.file = fopen(req.path, "rb");

            if (errno || !req.file)
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(1);
                strcpy(req.serverError.errormessage, "File not found or No Access");
                logMess(&req, 1);
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                req.attempt = UCHAR_MAX;
                continue;
            }

            setvbuf(req.file, NULL, _IOFBF, req.blksize);
        }
        else
        {
            if (!cfig.fileWrite && !cfig.fileOverwrite)
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(2);
                strcpy(req.serverError.errormessage, "PUT Access Denied");
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }

            req.file = fopen(req.path, "rb");

            if (req.file)
            {
                fclose(req.file);
                req.file = NULL;

                if (!cfig.fileOverwrite)
                {
                    req.serverError.opcode = htons(5);
                    req.serverError.errorcode = htons(6);
                    strcpy(req.serverError.errormessage, "File already exists");
                    send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                    logMess(&req, 1);
                    req.attempt = UCHAR_MAX;
                    continue;
                }
            }
            else if (!cfig.fileWrite)
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(2);
                strcpy(req.serverError.errormessage, "Create File Access Denied");
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }

            errno = 0;

            if (!strcasecmp(req.mode, "netascii") || !strcasecmp(req.mode, "ascii"))
                req.file = fopen(req.path, "wt");
            else
                req.file = fopen(req.path, "wb");

            if (errno || !req.file)
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(2);
                strcpy(req.serverError.errormessage, "Invalid Path or No Access");
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }
        }

        if (*inPtr)
        {
            fetchAck = true;
            char *outPtr = req.mesout.buffer;
            req.mesout.opcode = htons(6);
            DWORD val;
            while (*inPtr)
            {
                //printf("%s\n", inPtr);
                if (!strcasecmp(inPtr, "blksize"))
                {
                    strcpy(outPtr, inPtr);
                    outPtr += strlen(outPtr) + 1;
                    inPtr += strlen(inPtr) + 1;
                    val = atol(inPtr);

                    if (val < 512)
                        val = 512;
                    else if (val > blksize)
                        val = blksize;

                    req.blksize = val;
                    sprintf(outPtr, "%lu", val);
                    outPtr += strlen(outPtr) + 1;
                }
                else if (!strcasecmp(inPtr, "tsize"))
                {
                    strcpy(outPtr, inPtr);
                    outPtr += strlen(outPtr) + 1;
                    inPtr += strlen(inPtr) + 1;

                    if (ntohs(req.mesin.opcode) == 1)
                    {
                        if (!fseek(req.file, 0, SEEK_END))
                        {
                            if (ftell(req.file) >= 0)
                            {
                                req.tsize = ftell(req.file);
                                sprintf(outPtr, "%lu", req.tsize);
                                outPtr += strlen(outPtr) + 1;
                            }
                            else
                            {
                                req.serverError.opcode = htons(5);
                                req.serverError.errorcode = htons(2);
                                strcpy(req.serverError.errormessage, "Invalid Path or No Access");
                                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                                logMess(&req, 1);
                                req.attempt = UCHAR_MAX;
                                break;
                            }
                        }
                        else
                        {
                            req.serverError.opcode = htons(5);
                            req.serverError.errorcode = htons(2);
                            strcpy(req.serverError.errormessage, "Invalid Path or No Access");
                            send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                            logMess(&req, 1);
                            req.attempt = UCHAR_MAX;
                            break;
                        }
                    }
                    else
                    {
                        req.tsize = 0;
                        sprintf(outPtr, "%lu", req.tsize);
                        outPtr += strlen(outPtr) + 1;
                    }
                }
                else if (!strcasecmp(inPtr, "timeout"))
                {
                    strcpy(outPtr, inPtr);
                    outPtr += strlen(outPtr) + 1;
                    inPtr += strlen(inPtr) + 1;
                    val = atoi(inPtr);

                    if (val < 1)
                        val = 1;
                    else if (val > UCHAR_MAX)
                        val = UCHAR_MAX;

                    req.timeout = val;
                    req.expiry = time(NULL) + req.timeout;
                    sprintf(outPtr, "%lu", val);
                    outPtr += strlen(outPtr) + 1;
                }

                inPtr += strlen(inPtr) + 1;
                //printf("=%u\n", val);
            }

            if (req.attempt >= 3)
                continue;

            errno = 0;
            req.bytesReady = (DWORD_PTR)outPtr - (DWORD_PTR)&req.mesout;
            //printf("Bytes Ready=%u\n", req.bytesReady);
            send(req.sock, (const char*)&req.mesout, req.bytesReady, 0);
            errno = WSAGetLastError();
        }
        else if (htons(req.mesin.opcode) == 2)
        {
            req.acout.opcode = htons(4);
            req.acout.block = htons(0);
            errno = 0;
            req.bytesReady = 4;
            send(req.sock, (const char*)&req.mesout, req.bytesReady, 0);
            errno = WSAGetLastError();
        }

        if (errno)
        {
            sprintf(req.serverError.errormessage, "Communication Error");
            logMess(&req, 1);
            req.attempt = UCHAR_MAX;
            continue;
        }
        else if (ntohs(req.mesin.opcode) == 1)
        {
            errno = 0;
            req.pkt[0] = (packet*)calloc(1, req.blksize + 4);
            req.pkt[1] = (packet*)calloc(1, req.blksize + 4);

            if (errno || !req.pkt[0] || !req.pkt[1])
            {
                sprintf(req.serverError.errormessage, "Memory Error");
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }

            long ftellLoc = ftell(req.file);

            if (ftellLoc > 0)
            {
                if (fseek(req.file, 0, SEEK_SET))
                {
                    req.serverError.opcode = htons(5);
                    req.serverError.errorcode = htons(2);
                    strcpy(req.serverError.errormessage, "File Access Error");
                    send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                    logMess(&req, 1);
                    req.attempt = UCHAR_MAX;
                    continue;
                }
            }
            else if (ftellLoc < 0)
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(2);
                strcpy(req.serverError.errormessage, "File Access Error");
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }

            errno = 0;
            req.pkt[0]->opcode = htons(3);
            req.pkt[0]->block = htons(1);
            req.bytesRead[0] = fread(&req.pkt[0]->buffer, 1, req.blksize, req.file);

            if (errno)
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(2);
                strcpy(req.serverError.errormessage, "Invalid Path or No Access");
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }

            if (req.bytesRead[0] == req.blksize)
            {
                req.pkt[1]->opcode = htons(3);
                req.pkt[1]->block = htons(2);
                req.bytesRead[1] = fread(&req.pkt[1]->buffer, 1, req.blksize, req.file);
                if (req.bytesRead[1] < req.blksize)
                {
                    fclose(req.file);
                    req.file = 0;
                }
            }
            else
            {
                fclose(req.file);
                req.file = 0;
            }

            if (errno)
            {
                req.serverError.opcode = htons(5);
                req.serverError.errorcode = htons(2);
                strcpy(req.serverError.errormessage, "Invalid Path or No Access");
                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }

            while (req.attempt <= 3)
            {
                if (fetchAck)
                {
                    FD_ZERO(&req.readfds);
                    req.tv.tv_sec = 1;
                    req.tv.tv_usec = 0;
                    FD_SET(req.sock, &req.readfds);
                    select(req.sock + 1, &req.readfds, NULL, NULL, &req.tv);

                    if (FD_ISSET(req.sock, &req.readfds))
                    {
                        errno = 0;
                        req.bytesRecd = recv(req.sock, (char*)&req.mesin, sizeof(message), 0);
                        errno = WSAGetLastError();
                        if (req.bytesRecd <= 0 || errno)
                        {
                            sprintf(req.serverError.errormessage, "Communication Error");
                            logMess(&req, 1);
                            req.attempt = UCHAR_MAX;
                            break;
                        }
                        else if(req.bytesRecd >= 4 && ntohs(req.mesin.opcode) == 4)
                        {
                            if (ntohs(req.acin.block) == req.block)
                            {
                                req.block++;
                                req.fblock++;
                                req.attempt = 0;
                            }
                            else if (req.expiry > time(NULL))
                                continue;
                            else
                                req.attempt++;
                        }
                        else if (ntohs(req.mesin.opcode) == 5)
                        {
                            sprintf(req.serverError.errormessage, "Client %s:%u, Error Code %i at Client, %s", inet_ntoa(req.client.sin_addr), ntohs(req.client.sin_port), ntohs(req.clientError.errorcode), req.clientError.errormessage);
                            logMess(&req, 1);
                            req.attempt = UCHAR_MAX;
                            break;
                        }
                        else
                        {
                            req.serverError.opcode = htons(5);
                            req.serverError.errorcode = htons(4);
                            sprintf(req.serverError.errormessage, "Unexpected Option Code %i", ntohs(req.mesin.opcode));
                            send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                            logMess(&req, 1);
                            req.attempt = UCHAR_MAX;
                            break;
                        }
                    }
                    else if (req.expiry > time(NULL))
                        continue;
                    else
                        req.attempt++;
                }
                else
                {
                    fetchAck = true;
                    req.acin.block = 1;
                    req.block = 1;
                    req.fblock = 1;
                }

                if (req.attempt >= 3)
                {
                    req.serverError.opcode = htons(5);
                    req.serverError.errorcode = htons(0);

                    if (req.fblock && !req.block)
                        strcpy(req.serverError.errormessage, "Large File, Block# Rollover not supported by Client");
                    else
                        strcpy(req.serverError.errormessage, "Timeout");

                    logMess(&req, 1);
                    send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                    req.attempt = UCHAR_MAX;
                    break;
                }
                else if (!req.fblock)
                {
                    errno = 0;
                    send(req.sock, (const char*)&req.mesout, req.bytesReady, 0);
                    errno = WSAGetLastError();
                    if (errno)
                    {
                        sprintf(req.serverError.errormessage, "Communication Error");
                        logMess(&req, 1);
                        req.attempt = UCHAR_MAX;
                        break;
                    }
                    req.expiry = time(NULL) + req.timeout;
                }
                else if (ntohs(req.pkt[0]->block) == req.block)
                {
                    errno = 0;
                    send(req.sock, (const char*)req.pkt[0], req.bytesRead[0] + 4, 0);
                    errno = WSAGetLastError();
                    if (errno)
                    {
                        sprintf(req.serverError.errormessage, "Communication Error");
                        logMess(&req, 1);
                        req.attempt = UCHAR_MAX;
                        break;
                    }
                    req.expiry = time(NULL) + req.timeout;

                    if (req.file)
                    {
                        req.tblock = ntohs(req.pkt[1]->block) + 1;
                        if (req.tblock == req.block)
                        {
                            req.pkt[1]->block = htons(++req.tblock);
                            req.bytesRead[1] = fread(&req.pkt[1]->buffer, 1, req.blksize, req.file);

                            if (errno)
                            {
                                req.serverError.opcode = htons(5);
                                req.serverError.errorcode = htons(4);
                                sprintf(req.serverError.errormessage, strerror(errno));
                                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                                logMess(&req, 1);
                                req.attempt = UCHAR_MAX;
                                break;
                            }
                            else if (req.bytesRead[1] < req.blksize)
                            {
                                fclose(req.file);
                                req.file = 0;
                            }
                        }
                    }
                }
                else if (ntohs(req.pkt[1]->block) == req.block)
                {
                    errno = 0;
                    send(req.sock, (const char*)req.pkt[1], req.bytesRead[1] + 4, 0);
                    errno = WSAGetLastError();
                    if (errno)
                    {
                        sprintf(req.serverError.errormessage, "Communication Error");
                        logMess(&req, 1);
                        req.attempt = UCHAR_MAX;
                        break;
                    }

                    req.expiry = time(NULL) + req.timeout;

                    if (req.file)
                    {
                        req.tblock = ntohs(req.pkt[0]->block) + 1;
                        if (req.tblock == req.block)
                        {
                            req.pkt[0]->block = htons(++req.tblock);
                            req.bytesRead[0] = fread(&req.pkt[0]->buffer, 1, req.blksize, req.file);
                            if (errno)
                            {
                                req.serverError.opcode = htons(5);
                                req.serverError.errorcode = htons(4);
                                sprintf(req.serverError.errormessage, strerror(errno));
                                send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                                logMess(&req, 1);
                                req.attempt = UCHAR_MAX;
                                break;
                            }
                            else if (req.bytesRead[0] < req.blksize)
                            {
                                fclose(req.file);
                                req.file = 0;
                            }
                        }
                    }
                }
                else
                {
                    sprintf(req.serverError.errormessage, "%lu Blocks Served", req.fblock - 1);
                    logMess(&req, 2);
                    req.attempt = UCHAR_MAX;
                    break;
                }
            }
        }
        else if (ntohs(req.mesin.opcode) == 2)
        {
            errno = 0;
            req.pkt[0] = (packet*)calloc(1, req.blksize + 4);

            if (errno || !req.pkt[0])
            {
                sprintf(req.serverError.errormessage, "Memory Error");
                logMess(&req, 1);
                req.attempt = UCHAR_MAX;
                continue;
            }

            while (req.attempt <= 3)
            {
                FD_ZERO(&req.readfds);
                req.tv.tv_sec = 1;
                req.tv.tv_usec = 0;
                FD_SET(req.sock, &req.readfds);
                select(req.sock + 1, &req.readfds, NULL, NULL, &req.tv);

                if (FD_ISSET(req.sock, &req.readfds))
                {
                    errno = 0;
                    req.bytesRecd = recv(req.sock, (char*)req.pkt[0], req.blksize + 4, 0);
                    errno = WSAGetLastError();

                    if (errno)
                    {
                        sprintf(req.serverError.errormessage, "Communication Error");
                        logMess(&req, 1);
                        req.attempt = UCHAR_MAX;
                        break;
                    }
                }
                else
                    req.bytesRecd = 0;

                if (req.bytesRecd >= 4)
                {
                    if (ntohs(req.pkt[0]->opcode) == 3)
                    {
                        req.tblock = req.block + 1;

                        if (ntohs(req.pkt[0]->block) == req.tblock)
                        {
                            req.acout.opcode = htons(4);
                            req.acout.block = req.pkt[0]->block;
                            req.block++;
                            req.fblock++;
                            req.bytesReady = 4;
                            req.expiry = time(NULL) + req.timeout;

                            errno = 0;
                            send(req.sock, (const char*)&req.mesout, req.bytesReady, 0);
                            errno = WSAGetLastError();

                            if (errno)
                            {
                                sprintf(req.serverError.errormessage, "Communication Error");
                                logMess(&req, 1);
                                req.attempt = UCHAR_MAX;
                                break;
                            }

                            if (req.bytesRecd > 4)
                            {
                                errno = 0;
                                if (fwrite(&req.pkt[0]->buffer, req.bytesRecd - 4, 1, req.file) != 1 || errno)
                                {
                                    req.serverError.opcode = htons(5);
                                    req.serverError.errorcode = htons(3);
                                    strcpy(req.serverError.errormessage, "Disk full or allocation exceeded");
                                    send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                                    logMess(&req, 1);
                                    req.attempt = UCHAR_MAX;
                                    break;
                                }
                                else
                                    req.attempt = 0;
                            }
                            else
                                req.attempt = 0;

                            if ((WORD)req.bytesRecd < req.blksize + 4)
                            {
                                fclose(req.file);
                                req.file = 0;
                                sprintf(req.serverError.errormessage, "%lu Blocks Received", req.fblock);
                                logMess(&req, 2);
                                req.attempt = UCHAR_MAX;
                                break;
                            }
                        }
                        else if (req.expiry > time(NULL))
                            continue;
                        else if (req.attempt >= 3)
                        {
                            req.serverError.opcode = htons(5);
                            req.serverError.errorcode = htons(0);

                            if (req.fblock && !req.block)
                                strcpy(req.serverError.errormessage, "Large File, Block# Rollover not supported by Client");
                            else
                                strcpy(req.serverError.errormessage, "Timeout");

                            logMess(&req, 1);
                            send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                            req.attempt = UCHAR_MAX;
                            break;
                        }
                        else
                        {
                            req.expiry = time(NULL) + req.timeout;
                            errno = 0;
                            send(req.sock, (const char*)&req.mesout, req.bytesReady, 0);
                            errno = WSAGetLastError();
                            req.attempt++;

                            if (errno)
                            {
                                sprintf(req.serverError.errormessage, "Communication Error");
                                logMess(&req, 1);
                                req.attempt = UCHAR_MAX;
                                break;
                            }
                        }
                    }
                    else if (req.bytesRecd > (int)sizeof(message))
                    {
                        req.serverError.opcode = htons(5);
                        req.serverError.errorcode = htons(4);
                        sprintf(req.serverError.errormessage, "Error: Incoming Packet too large");
                        send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                        logMess(&req, 1);
                        req.attempt = UCHAR_MAX;
                        break;
                    }
                    else if (ntohs(req.pkt[0]->opcode) == 5)
                    {
                        sprintf(req.serverError.errormessage, "Error Code %i at Client, %s", ntohs(req.pkt[0]->block), &req.pkt[0]->buffer);
                        logMess(&req, 1);
                        req.attempt = UCHAR_MAX;
                        break;
                    }
                    else
                    {
                        req.serverError.opcode = htons(5);
                        req.serverError.errorcode = htons(4);
                        sprintf(req.serverError.errormessage, "Unexpected Option Code %i", ntohs(req.pkt[0]->opcode));
                        send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                        logMess(&req, 1);
                        req.attempt = UCHAR_MAX;
                        break;
                    }
                }
                else if (req.expiry > time(NULL))
                    continue;
                else if (req.attempt >= 3)
                {
                    req.serverError.opcode = htons(5);
                    req.serverError.errorcode = htons(0);

                    if (req.fblock && !req.block)
                        strcpy(req.serverError.errormessage, "Large File, Block# Rollover not supported by Client");
                    else
                        strcpy(req.serverError.errormessage, "Timeout");

                    logMess(&req, 1);
                    send(req.sock, (const char*)&req.serverError, strlen(req.serverError.errormessage) + 5, 0);
                    req.attempt = UCHAR_MAX;
                    break;
                }
                else
                {
                    req.expiry = time(NULL) + req.timeout;
                    errno = 0;
                    send(req.sock, (const char*)&req.mesout, req.bytesReady, 0);
                    errno = WSAGetLastError();
                    req.attempt++;

                    if (errno)
                    {
                        sprintf(req.serverError.errormessage, "Communication Error");
                        logMess(&req, 1);
                        req.attempt = UCHAR_MAX;
                        break;
                    }
                }
            }
        }
    }
    while (cleanReq(&req));

    WaitForSingleObject(cEvent, INFINITE);
    totalThreads--;
    SetEvent(cEvent);

    //printf("Thread %u Killed\n",GetCurrentThreadId());
    _endthread();
    return;
}

bool cleanReq(request* req)
{
    //printf("cleaning\n");

    if (req->file)
        fclose(req->file);

    if (!(req->sock == INVALID_SOCKET))
    {
        //printf("Here\n");
        closesocket(req->sock);
    }

    if (req->pkt[0])
        free(req->pkt[0]);

    if (req->pkt[1])
        free(req->pkt[1]);

    WaitForSingleObject(cEvent, INFINITE);
    activeThreads--;
    SetEvent(cEvent);

    //printf("cleaned\n");

    return (totalThreads <= minThreads);
}

char* myGetToken(char* buff, BYTE index)
{
    while (*buff)
    {
        if (index)
            index--;
        else
            break;

        buff += strlen(buff) + 1;
    }

    return buff;
}

WORD myTokenize(char *target, char *source, char *sep, bool whiteSep)
{
    bool found = true;
    char *dp = target;
    WORD kount = 0;

    while (*source)
    {
        if (sep && sep[0] && strchr(sep, (*source)))
        {
            found = true;
            source++;
            continue;
        }
        else if (whiteSep && *source <= 32)
        {
            found = true;
            source++;
            continue;
        }

        if (found)
        {
            if (target != dp)
            {
                *dp = 0;
                dp++;
            }
            kount++;
        }

        found = false;
        *dp = *source;
        dp++;
        source++;
    }

    *dp = 0;
    dp++;
    *dp = 0;

    //printf("%s\n", target);

    return kount;
}

char* myTrim(char *target, char *source)
{
    while ((*source) && (*source) <= 32)
        source++;

    int i = 0;

    for (; i < 511 && source[i]; i++)
        target[i] = source[i];

    target[i] = source[i];
    i--;

    for (; i >= 0 && target[i] <= 32; i--)
        target[i] = 0;

    return target;
}

void mySplit(char *name, char *value, char *source, char splitChar)
{
    int i = 0;
    int j = 0;
    int k = 0;

    for (; source[i] && j <= 510 && source[i] != splitChar; i++, j++)
    {
        name[j] = source[i];
    }

    if (source[i])
    {
        i++;
        for (; k <= 510 && source[i]; i++, k++)
        {
            value[k] = source[i];
        }
    }

    name[j] = 0;
    value[k] = 0;

    myTrim(name, name);
    myTrim(value, value);
    //printf("%s %s\n", name, value);
}

bool getSection(const char *sectionName, char *buffer, BYTE serial, char *fileName)
{
    //printf("%s=%s\n",fileName,sectionName);
    char section[128];
    sprintf(section, "[%s]", sectionName);
    myUpper(section);
    FILE *f = fopen(fileName, "rt");
    char buff[512];
    BYTE found = 0;

    if (f)
    {
        while (fgets(buff, 511, f))
        {
            myUpper(buff);
            myTrim(buff, buff);

            if (strstr(buff, section) == buff)
            {
                found++;
                if (found == serial)
                {
                    //printf("%s=%s\n",fileName,sectionName);
                    while (fgets(buff, 511, f))
                    {
                        myTrim(buff, buff);

                        if (strstr(buff, "[") == buff)
                            break;

                        if (((*buff) >= '0' && (*buff) <= '9') || ((*buff) >= 'A' && (*buff) <= 'Z') || ((*buff) >= 'a' && (*buff) <= 'z') || (((*buff) && strchr("/\\?*", (*buff)))))
                        {
                            buffer += sprintf(buffer, "%s", buff);
                            buffer++;
                        }
                    }
                    break;
                }
            }
        }
        fclose(f);
    }

    *buffer = 0;
    *(buffer + 1) = 0;
    return (found == serial);
}

char *IP2String(char *target, DWORD ip)
{
    data15 inaddr;
    inaddr.ip = ip;
    sprintf(target, "%u.%u.%u.%u", inaddr.octate[0], inaddr.octate[1], inaddr.octate[2], inaddr.octate[3]);
    return target;
}

bool isIP(char *string)
{
    int j = 0;

    for (; *string; string++)
    {
        if (*string == '.' && *(string + 1) != '.')
            j++;
        else if (*string < '0' || *string > '9')
            return 0;
    }

    if (j == 3)
        return 1;
    else
        return 0;
}

char *myUpper(char *string)
{
    char diff = 'a' - 'A';
    WORD len = strlen(string);
    for (int i = 0; i < len; i++)
        if (string[i] >= 'a' && string[i] <= 'z')
            string[i] -= diff;
    return string;
}

char *myLower(char *string)
{
    char diff = 'a' - 'A';
    WORD len = strlen(string);
    for (int i = 0; i < len; i++)
        if (string[i] >= 'A' && string[i] <= 'Z')
            string[i] += diff;
    return string;
}

void init()
{
    memset(&cfig, 0, sizeof(cfig));

    GetModuleFileName(NULL, iniFile, MAX_PATH);
    char *iniFileExt = strrchr(iniFile, '.');
    strcpy(iniFileExt, ".ini");
    GetModuleFileName(NULL, logFile, MAX_PATH);
    iniFileExt = strrchr(logFile, '.');
    strcpy(iniFileExt, ".log");

    char iniStr[4096];
    char name[256];
    char value[256];

    if (verbatim)
    {
        cfig.logLevel = 2;
        printf("%s\n\n", sVersion);
    }
    else if (getSection("LOGGING", iniStr, 1, iniFile))
    {
        char *iniStrPtr = myGetToken(iniStr, 0);

        if (!iniStrPtr[0] || !strcasecmp(iniStrPtr, "None"))
            cfig.logLevel = 0;
        else if (!strcasecmp(iniStrPtr, "Errors"))
            cfig.logLevel = 1;
        else if (!strcasecmp(iniStrPtr, "All"))
            cfig.logLevel = 2;
        else if (!strcasecmp(iniStrPtr, "Debug"))
            cfig.logLevel = 3;
        else
            cfig.logLevel = UCHAR_MAX;
    }

    if (!verbatim && cfig.logLevel)
    {
        cfig.logfile = fopen(logFile, "wt");

        if (cfig.logfile)
        {
            fclose(cfig.logfile);
            cfig.logfile = fopen(logFile, "at");
            fprintf(cfig.logfile, "%s\n", sVersion);
        }
    }

    if (cfig.logLevel == UCHAR_MAX)
    {
        cfig.logLevel = 1;
        sprintf(logBuff, "Section [LOGGING], Invalid Logging Level: %s, ignored", myGetToken(iniStr, 0));
        logMess(logBuff, 1);
    }

    WORD wVersionRequested = MAKEWORD(1, 1);
    WSAStartup(wVersionRequested, &cfig.wsaData);

    if (cfig.wsaData.wVersion != wVersionRequested)
    {
        sprintf(logBuff, "WSAStartup Error");
        logMess(logBuff, 1);
    }

    if (getSection("LISTEN-ON", iniStr, 1, iniFile))
    {
        char *iniStrPtr = myGetToken(iniStr, 0);

        for (int i = 0; i < MAX_SERVERS && iniStrPtr[0]; iniStrPtr = myGetToken(iniStrPtr, 1))
        {
            strncpy(name, iniStrPtr, UCHAR_MAX);
            WORD port = 69;
            char *dp = strchr(name, ':');
            if (dp)
            {
                *dp = 0;
                dp++;
                port = atoi(dp);
            }

            DWORD ip = my_inet_addr(name);

            if (isIP(name) && ip)
            {
                for (BYTE j = 0; j < MAX_SERVERS; j++)
                {
                    if (cfig.servers[j] == ip)
                        break;
                    else if (!cfig.servers[j])
                    {
                        cfig.servers[j] = ip;
                        cfig.ports[j] = port;
                        i++;
                        break;
                    }
                }
            }
            else
            {
                sprintf(logBuff, "Warning: Section [LISTEN-ON], Invalid IP Address %s, ignored", iniStrPtr);
                logMess(logBuff, 1);
            }
        }
    }

    if (getSection("HOME", iniStr, 1, iniFile))
    {
        char *iniStrPtr = myGetToken(iniStr, 0);
        for (; iniStrPtr[0]; iniStrPtr = myGetToken(iniStrPtr, 1))
        {
            mySplit(name, value, iniStrPtr, '=');
            if (strlen(value))
            {
                if (!cfig.homes[0].alias[0] && cfig.homes[0].target[0])
                {
                    sprintf(logBuff, "Section [HOME], alias and bare path mixup, entry %s ignored", iniStrPtr);
                    logMess(logBuff, 1);
                }
                else if (strchr(name, notFileSep) || strchr(name, fileSep) || strchr(name, '>') || strchr(name, '<') || strchr(name, '.'))
                {
                    sprintf(logBuff, "Section [HOME], invalid chars in alias %s, entry ignored", name);
                    logMess(logBuff, 1);
                }
                else if (name[0] && strlen(name) < 64 && value[0])
                {
                    for (int i = 0; i < 8; i++)
                    {
                        if (cfig.homes[i].alias[0] && !strcasecmp(name, cfig.homes[i].alias))
                        {
                            sprintf(logBuff, "Section [HOME], Duplicate Entry: %s ignored", iniStrPtr);
                            logMess(logBuff, 1);
                            break;
                        }
                        else if (!cfig.homes[i].alias[0])
                        {
                            strcpy(cfig.homes[i].alias, name);
                            strcpy(cfig.homes[i].target, value);

                            if (cfig.homes[i].target[strlen(cfig.homes[i].target) - 1] != fileSep)
                            {
                                tempbuff[0] = fileSep;
                                tempbuff[1] = 0;
                                strcat(cfig.homes[i].target, tempbuff);
                            }

                            break;
                        }
                    }
                }
                else
                {
                    sprintf(logBuff, "Section [HOME], alias %s too large", name);
                    logMess(logBuff, 1);
                }
            }
            else if (!cfig.homes[0].alias[0] && !cfig.homes[0].target[0])
            {
                strcpy(cfig.homes[0].target, name);

                if (cfig.homes[0].target[strlen(cfig.homes[0].target) - 1] != fileSep)
                {
                    tempbuff[0] = fileSep;
                    tempbuff[1] = 0;
                    strcat(cfig.homes[0].target, tempbuff);
                }
            }
            else if (cfig.homes[0].alias[0])
            {
                sprintf(logBuff, "Section [HOME], alias and bare path mixup, entry %s ignored", iniStrPtr);
                logMess(logBuff, 1);
            }
            else if (cfig.homes[0].target[0])
            {
                sprintf(logBuff, "Section [HOME], Duplicate Path: %s ignored", iniStrPtr);
                logMess(logBuff, 1);
            }
            else
            {
                sprintf(logBuff, "Section [HOME], missing = sign, Invalid Entry: %s ignored", iniStrPtr);
                logMess(logBuff, 1);
            }
        }
    }

    if (!cfig.homes[0].target[0])
    {
        GetModuleFileName(NULL, cfig.homes[0].target, UCHAR_MAX);
        char *iniFileExt = strrchr(cfig.homes[0].target, fileSep);
        *(++iniFileExt) = 0;
    }

    cfig.fileRead = true;

    if (getSection("TFTP-OPTIONS", iniStr, 1, iniFile))
    {
        char *iniStrPtr = myGetToken(iniStr, 0);
        for (;strlen(iniStrPtr);iniStrPtr = myGetToken(iniStrPtr, 1))
        {
            mySplit(name, value, iniStrPtr, '=');
            if (strlen(value))
            {
                if (!strcasecmp(name, "blksize"))
                {
                    DWORD tblksize = atol(value);

                    if (tblksize < 512)
                        blksize = 512;
                    else if (tblksize > USHRT_MAX - 32)
                        blksize = USHRT_MAX - 32;
                    else
                        blksize = tblksize;
                }
                else if (!strcasecmp(name, "threadpoolsize"))
                {
                    minThreads = atol(value);
                    if (minThreads < 1)
                        minThreads = 0;
                    else if (minThreads > 100)
                        minThreads = 100;
                }
                else if (!strcasecmp(name, "timeout"))
                {
                    timeout = atol(value);
                    if (timeout < 1)
                        timeout = 1;
                    else if (timeout > UCHAR_MAX)
                        timeout = UCHAR_MAX;
                }
                else if (!strcasecmp(name, "Read"))
                {
                    if (strchr("Yy", *value))
                        cfig.fileRead = true;
                    else
                        cfig.fileRead = false;
                }
                else if (!strcasecmp(name, "Write"))
                {
                    if (strchr("Yy", *value))
                        cfig.fileWrite = true;
                    else
                        cfig.fileWrite = false;
                }
                else if (!strcasecmp(name, "Overwrite"))
                {
                    if (strchr("Yy", *value))
                        cfig.fileOverwrite = true;
                    else
                        cfig.fileOverwrite = false;
                }
                else if (!strcasecmp(name, "port-range"))
                {
                    char *ptr = strchr(value, '-');
                    if (ptr)
                    {
                        *ptr = 0;
                        cfig.minport = atol(value);
                        cfig.maxport = atol(++ptr);

                        if (cfig.minport < 1024 || cfig.minport >= USHRT_MAX || cfig.maxport < 1024 || cfig.maxport >= USHRT_MAX || cfig.minport > cfig.maxport)
                        {
                            cfig.minport = 0;
                            cfig.maxport = 0;

                            sprintf(logBuff, "Invalid port range %s", value);
                            logMess(logBuff, 1);
                        }
                    }
                    else
                    {
                        sprintf(logBuff, "Invalid port range %s", value);
                        logMess(logBuff, 1);
                    }
                }
                else
                {
                    sprintf(logBuff, "Warning: unknown option %s, ignored", name);
                    logMess(logBuff, 1);
                }
            }
        }
    }

    if (getSection("ALLOWED-CLIENTS", iniStr, 1, iniFile))
    {
        char *iniStrPtr = myGetToken(iniStr, 0);
        for (int i = 0; i < 32 && iniStrPtr[0]; iniStrPtr = myGetToken(iniStrPtr, 1))
        {
            DWORD rs = 0;
            DWORD re = 0;
            mySplit(name, value, iniStrPtr, '-');
            rs = htonl(my_inet_addr(name));

            if (strlen(value))
                re = htonl(my_inet_addr(value));
            else
                re = rs;

            if (rs && rs != INADDR_NONE && re && re != INADDR_NONE && rs <= re)
            {
                cfig.hostRanges[i].rangeStart = rs;
                cfig.hostRanges[i].rangeEnd = re;
                i++;
            }
            else
            {
                sprintf(logBuff, "Section [ALLOWED-CLIENTS] Invalid entry %s in ini file, ignored", iniStrPtr);
                logMess(logBuff, 1);
            }
        }
    }

//    if (!cfig.servers[0])
//        getServ();

    int i = 0;

    for (int j = 0; j < MAX_SERVERS; j++)
    {
         if (j && !cfig.servers[j])
             break;

         cfig.tftpConn[i].sock = socket(PF_INET,
                                       SOCK_DGRAM,
                                       IPPROTO_UDP);

        if (cfig.tftpConn[i].sock == INVALID_SOCKET)
        {
            sprintf(logBuff, "Failed to Create Socket");
            logMess(logBuff, 1);
            continue;
        }

        cfig.tftpConn[i].addr.sin_family = AF_INET;

        if (!cfig.ports[j])
            cfig.ports[j] = 69;

        cfig.tftpConn[i].addr.sin_addr.s_addr = cfig.servers[j];
        cfig.tftpConn[i].addr.sin_port = htons(cfig.ports[j]);

        socklen_t nRet = bind(cfig.tftpConn[i].sock,
                              (sockaddr*)&cfig.tftpConn[i].addr,
                              sizeof(struct sockaddr_in)
                             );

        if (nRet == SOCKET_ERROR)
        {
            closesocket(cfig.tftpConn[i].sock);
            sprintf(logBuff, "%s Port %u, bind failed", IP2String(tempbuff, cfig.servers[j]), cfig.ports[j]);
            logMess(logBuff, 1);
            continue;
        }

        if (cfig.maxFD < cfig.tftpConn[i].sock)
            cfig.maxFD = cfig.tftpConn[i].sock;

        cfig.tftpConn[i].server = cfig.tftpConn[i].addr.sin_addr.s_addr;
        cfig.tftpConn[i].port = htons(cfig.tftpConn[i].addr.sin_port);
        i++;
    }

    cfig.maxFD++;

    if (!cfig.tftpConn[0].port)
    {
        sprintf(logBuff, "no listening interfaces available, stopping..\nPress Enter to exit\n");
        logMess(logBuff, 1);
        getchar();
        exit(-1);
    }
    else if (verbatim)
    {
        printf("starting TFTP...\n");
    }
    else
    {
        sprintf(logBuff, "starting TFTP service");
        logMess(logBuff, 1);
    }

    for (int i = 0; i < MAX_SERVERS; i++)
        if (cfig.homes[i].target[0])
        {
            sprintf(logBuff, "alias /%s is mapped to %s", cfig.homes[i].alias, cfig.homes[i].target);
            logMess(logBuff, 1);
        }

    if (cfig.hostRanges[0].rangeStart)
    {
        char temp[128];

        for (WORD i = 0; i <= sizeof(cfig.hostRanges) && cfig.hostRanges[i].rangeStart; i++)
        {
            sprintf(logBuff, "%s", "permitted clients: ");
            sprintf(temp, "%s-", IP2String(tempbuff, htonl(cfig.hostRanges[i].rangeStart)));
            strcat(logBuff, temp);
            sprintf(temp, "%s", IP2String(tempbuff, htonl(cfig.hostRanges[i].rangeEnd)));
            strcat(logBuff, temp);
            logMess(logBuff, 1);
        }
    }
    else
    {
        sprintf(logBuff, "%s", "permitted clients: all");
        logMess(logBuff, 1);
    }

    if (cfig.minport)
    {
        sprintf(logBuff, "server port range: %u-%u", cfig.minport, cfig.maxport);
        logMess(logBuff, 1);
    }
    else
    {
        sprintf(logBuff, "server port range: all");
        logMess(logBuff, 1);
    }

    sprintf(logBuff, "max blksize: %u", blksize);
    logMess(logBuff, 1);
    sprintf(logBuff, "default blksize: %u", 512);
    logMess(logBuff, 1);
    sprintf(logBuff, "default timeout: %u", timeout);
    logMess(logBuff, 1);
    sprintf(logBuff, "file read allowed: %s", cfig.fileRead ? "Yes" : "No");
    logMess(logBuff, 1);
    sprintf(logBuff, "file create allowed: %s", cfig.fileWrite ? "Yes" : "No");
    logMess(logBuff, 1);
    sprintf(logBuff, "file overwrite allowed: %s", cfig.fileOverwrite ? "Yes" : "No");
    logMess(logBuff, 1);

    if (!verbatim)
    {
        sprintf(logBuff, "logging: %s", cfig.logLevel > 1 ? "all" : "errors");
        logMess(logBuff, 1);
    }

    lEvent = CreateEvent(
        NULL,                  // default security descriptor
        FALSE,                 // ManualReset
        TRUE,                  // Signalled
        TEXT("AchalTFTServerLogEvent"));  // object name

    if (lEvent == NULL)
    {
        printf("CreateEvent error: %lu\n", GetLastError());
        exit(-1);
    }
    else if ( GetLastError() == ERROR_ALREADY_EXISTS )
    {
        sprintf(logBuff, "CreateEvent opened an existing Event\nServer May already be Running");
        logMess(logBuff, 0);
        exit(-1);
    }

    tEvent = CreateEvent(
        NULL,                  // default security descriptor
        FALSE,                 // ManualReset
        FALSE,                 // Signalled
        TEXT("AchalTFTServerThreadEvent"));  // object name

    if (tEvent == NULL)
    {
        printf("CreateEvent error: %lu\n", GetLastError());
        exit(-1);
    }
    else if ( GetLastError() == ERROR_ALREADY_EXISTS )
    {
        sprintf(logBuff, "CreateEvent opened an existing Event\nServer May already be Running");
        logMess(logBuff, 0);
        exit(-1);
    }

    sEvent = CreateEvent(
        NULL,                  // default security descriptor
        FALSE,                 // ManualReset
        TRUE,                  // Signalled
        TEXT("AchalTFTServerSocketEvent"));  // object name

    if (sEvent == NULL)
    {
        printf("CreateEvent error: %lu\n", GetLastError());
        exit(-1);
    }
    else if ( GetLastError() == ERROR_ALREADY_EXISTS )
    {
        sprintf(logBuff, "CreateEvent opened an existing Event\nServer May already be Running");
        logMess(logBuff, 0);
        exit(-1);
    }

    cEvent = CreateEvent(
        NULL,                  // default security descriptor
        FALSE,                 // ManualReset
        TRUE,                  // Signalled
        TEXT("AchalTFTServerCountEvent"));  // object name

    if (cEvent == NULL)
    {
        printf("CreateEvent error: %lu\n", GetLastError());
        exit(-1);
    }
    else if ( GetLastError() == ERROR_ALREADY_EXISTS )
    {
        sprintf(logBuff, "CreateEvent opened an existing Event\nServer May already be Running");
        logMess(logBuff, 0);
        exit(-1);
    }

    if (minThreads)
    {
        for (int i = 0; i < minThreads; i++)
        {
            _beginthread(
                  processRequest,                 // thread function
                  0,                            // default security attributes
                  NULL);                          // argument to thread function
        }

        sprintf(logBuff, "thread pool size: %u", minThreads);
        logMess(logBuff, 1);
    }

    for (int i = 0; i < MAX_SERVERS && cfig.tftpConn[i].port; i++)
    {
        sprintf(logBuff, "listening on: %s:%i", IP2String(tempbuff, cfig.tftpConn[i].server), cfig.tftpConn[i].port);
        logMess(logBuff, 1);
    }
}

void logMess(char *logBuff, BYTE logLevel)
{
    WaitForSingleObject(lEvent, INFINITE);

    if (verbatim)
        printf("%s\n", logBuff);
    else if (cfig.logfile && logLevel <= cfig.logLevel)
    {
        char currentTime[32];
        time_t t = time(NULL);
        tm *ttm = localtime(&t);
        strftime(currentTime, sizeof(currentTime), "%d-%b-%y %X", ttm);
        fprintf(cfig.logfile, "[%s] %s\n", currentTime, logBuff);
        fflush(cfig.logfile);
    }
    SetEvent(lEvent);
}

void logMess(request *req, BYTE logLevel)
{
    WaitForSingleObject(lEvent, INFINITE);

    char tempbuff[256];

    if (verbatim)
    {
        if (!req->serverError.errormessage[0])
            sprintf(req->serverError.errormessage, strerror(errno));

        if (req->path[0])
            printf("Client %s:%u %s, %s\n", IP2String(tempbuff, req->client.sin_addr.s_addr), ntohs(req->client.sin_port), req->path, req->serverError.errormessage);
        else
            printf("Client %s:%u, %s\n", IP2String(tempbuff, req->client.sin_addr.s_addr), ntohs(req->client.sin_port), req->serverError.errormessage);
    }
    else if (cfig.logfile && logLevel <= cfig.logLevel)
    {
        char currentTime[32];
        time_t t = time(NULL);
        tm *ttm = localtime(&t);
        strftime(currentTime, sizeof(currentTime), "%d-%b-%y %X", ttm);

        if (req->path[0])
            fprintf(cfig.logfile, "[%s] Client %s:%u %s, %s\n", currentTime, IP2String(tempbuff, req->client.sin_addr.s_addr), ntohs(req->client.sin_port), req->path, req->serverError.errormessage);
        else
            fprintf(cfig.logfile, "[%s] Client %s:%u, %s\n", currentTime, IP2String(tempbuff, req->client.sin_addr.s_addr), ntohs(req->client.sin_port), req->serverError.errormessage);

        fflush(cfig.logfile);
    }
    SetEvent(lEvent);
}