openvpn-gui/openvpn.c

/*
 *  OpenVPN-GUI -- A Windows GUI for OpenVPN.
 *
 *  Copyright (C) 2004 Mathias Sundman <mathias@nilings.se>
 *                2010 Heiko Hund <heikoh@users.sf.net>
 *                2016 Selva Nair <selva.nair@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 (see the file COPYING included with this
 *  distribution); if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <windows.h>
#include <windowsx.h>
#include <versionhelpers.h>
#include <tchar.h>
#include <stdlib.h>
#include <stdio.h>
#include <process.h>
#include <richedit.h>
#include <time.h>
#include <commctrl.h>

#ifndef WM_DPICHANGED
#define WM_DPICHANGED 0x02E0
#endif

#include "tray.h"
#include "main.h"
#include "openvpn.h"
#include "openvpn_config.h"
#include "openvpn-gui-res.h"
#include "options.h"
#include "scripts.h"
#include "viewlog.h"
#include "proxy.h"
#include "passphrase.h"
#include "localization.h"
#include "misc.h"
#include "access.h"
#include "save_pass.h"
#include "env_set.h"
#include "echo.h"

extern options_t o;

static BOOL
TerminateOpenVPN(connection_t *c);

const TCHAR *cfgProp = _T("conn");

#define FLAG_CR_TYPE_SCRV1 0x1    /* static challenege */
#define FLAG_CR_TYPE_CRV1  0x2    /* dynamic challenege */
#define FLAG_CR_ECHO       0x4    /* echo the response */
#define FLAG_CR_RESPONSE   0x8    /* response needed */
#define FLAG_PASS_TOKEN    0x10   /* PKCS11 token password needed */
#define FLAG_STRING_PKCS11 0x20   /* PKCS11 id needed */
#define FLAG_PASS_PKEY     0x40   /* Private key password needed */

typedef struct {
    connection_t *c;
    unsigned int flags;
    char *str;
    char *id;
    char *user;
} auth_param_t;

static void
free_auth_param (auth_param_t *param)
{
    if (!param)
        return;
    free (param->str);
    free (param->id);
    free (param->user);
    free (param);
}

void
AppendTextToCaption (HANDLE hwnd, const WCHAR *str)
{
    WCHAR old[256];
    WCHAR new[256];
    GetWindowTextW (hwnd, old, _countof(old));
    _sntprintf_0 (new, L"%s (%s)", old, str);
    SetWindowText (hwnd, new);
}

/*
 * Show an error tooltip with msg attached to the specified
 * editbox handle.
 */
static void
show_error_tip(HWND editbox, const WCHAR *msg)
{
    EDITBALLOONTIP bt;
    bt.cbStruct = sizeof(EDITBALLOONTIP);
    bt.pszText = msg;
    bt.pszTitle = L"Invalid input";
    bt.ttiIcon = TTI_ERROR_LARGE;

    SendMessage(editbox, EM_SHOWBALLOONTIP, 0, (LPARAM)&bt);
}

/*
 * Receive banner on connection to management interface
 * Format: <BANNER>
 */
void
OnReady(connection_t *c, UNUSED char *msg)
{
    ManagementCommand(c, "state on", NULL, regular);
    ManagementCommand(c, "log all on", OnLogLine, combined);
    ManagementCommand(c, "echo all on", OnEcho, combined);
    ManagementCommand(c, "bytecount 5", NULL, regular);
}


/*
 * Handle the request to release a hold from the OpenVPN management interface
 */
void
OnHold(connection_t *c, UNUSED char *msg)
{
    ManagementCommand(c, "hold off", NULL, regular);
    ManagementCommand(c, "hold release", NULL, regular);
}

/*
 * Handle a log line from the OpenVPN management interface
 * Format <TIMESTAMP>,<FLAGS>,<MESSAGE>
 */
void
OnLogLine(connection_t *c, char *line)
{
    HWND logWnd = GetDlgItem(c->hwndStatus, ID_EDT_LOG);
    char *flags, *message;
    time_t timestamp;
    TCHAR *datetime;
    const SETTEXTEX ste = {
        .flags = ST_SELECTION,
        .codepage = CP_UTF8
    };

    flags = strchr(line, ',') + 1;
    if (flags - 1 == NULL)
        return;

    message = strchr(flags, ',') + 1;
    if (message - 1 == NULL)
        return;
    size_t flag_size = message - flags - 1; /* message is always > flags */

    /* Remove lines from log window if it is getting full */
    if (SendMessage(logWnd, EM_GETLINECOUNT, 0, 0) > MAX_LOG_LINES)
    {
        int pos = SendMessage(logWnd, EM_LINEINDEX, DEL_LOG_LINES, 0);
        SendMessage(logWnd, EM_SETSEL, 0, pos);
        SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) _T(""));
    }

    timestamp = strtol(line, NULL, 10);
    datetime = _tctime(&timestamp);
    datetime[24] = _T(' ');

    /* deselect current selection, if any */
    SendMessage(logWnd, EM_SETSEL, (WPARAM) -1, (LPARAM) -1);

    /* change text color if Warning or Error */
    COLORREF text_clr = 0;

    if (memchr(flags, 'N', flag_size) || memchr(flags, 'F', flag_size))
        text_clr = o.clr_error;
    else if (memchr(flags, 'W', flag_size))
        text_clr = o.clr_warning;

    if (text_clr != 0)
    {
        CHARFORMAT cfm = { .cbSize = sizeof(CHARFORMAT),
                           .dwMask = CFM_COLOR|CFM_BOLD,
                           .dwEffects = 0,
                           .crTextColor = text_clr,
                         };
        SendMessage(logWnd, EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM) &cfm);
    }

    /* Append line to log window */
    SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) datetime);
    SendMessage(logWnd, EM_SETTEXTEX, (WPARAM) &ste, (LPARAM) message);
    SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) _T("\n"));
}

/* expect ipv4,remote,port,,,ipv6 */
static void
parse_assigned_ip(connection_t *c, const char *msg)
{
    char *sep;
    CLEAR(c->ip);
    CLEAR(c->ipv6);

    /* extract local ipv4 address if available*/
    sep = strchr(msg, ',');
    if (sep == NULL)
        return;

    /* Convert the IP address to Unicode */
    if (sep - msg > 0
        && MultiByteToWideChar(CP_UTF8, 0, msg, sep-msg, c->ip, _countof(c->ip)-1) == 0)
    {
        WriteStatusLog(c, L"GUI> ", L"Failed to extract the assigned ipv4 address (error = %d)",
                       GetLastError());
        c->ip[0] = L'\0';
    }

    /* extract local ipv6 address if available */

    /* skip 4 commas */
    for (int i = 0; i < 4 && sep; i++)
    {
        sep = strchr(sep + 1, ',');
    }
    if (!sep)
        return;

    sep++; /* start of ipv6 address */
    /* Convert the IP address to Unicode */
    if (MultiByteToWideChar(CP_UTF8, 0, sep, -1, c->ipv6, _countof(c->ipv6)-1) == 0)
    {
        WriteStatusLog(c, L"GUI> ", L"Failed to extract the assigned ipv6 address (error = %d)",
                       GetLastError());
        c->ipv6[0] = L'\0';
    }
}

/*
 * Handle a state change notification from the OpenVPN management interface
 * Format <TIMESTAMP>,<STATE>,[<MESSAGE>],[<LOCAL_IP>][,<REMOTE_IP>]
 */
void
OnStateChange(connection_t *c, char *data)
{
    char *pos, *state, *message;

    pos = strchr(data, ',');
    if (pos == NULL)
        return;
    *pos = '\0';

    state = pos + 1;
    pos = strchr(state, ',');
    if (pos == NULL)
        return;
    *pos = '\0';

    message = pos + 1;
    pos = strchr(message, ',');
    if (pos == NULL)
        return;
    *pos = '\0';

    if (strcmp(state, "CONNECTED") == 0)
    {
        parse_assigned_ip(c, pos + 1);
    }
    if (strcmp(state, "CONNECTED") == 0 && strcmp(message, "SUCCESS") == 0)
    {
        /* concatenate ipv4 and ipv6 addresses into one string */
        WCHAR ip_txt[256];
        WCHAR ip[64];
        wcs_concat2(ip, _countof(ip), c->ip, c->ipv6, L", ");
        LoadLocalizedStringBuf(ip_txt, _countof(ip_txt), IDS_NFO_ASSIGN_IP, ip);

        /* Run Connect Script */
        if (c->state == connecting || c->state == resuming)
            RunConnectScript(c, false);

        /* Show connection tray balloon */
        if ((c->state == connecting   && o.show_balloon != 0)
        ||  (c->state == resuming     && o.show_balloon != 0)
        ||  (c->state == reconnecting && o.show_balloon == 2))
        {
            TCHAR msg[256];
            LoadLocalizedStringBuf(msg, _countof(msg), IDS_NFO_NOW_CONNECTED, c->config_name);
            ShowTrayBalloon(msg, (ip[0] ? ip_txt : _T("")));
        }

        /* Save time when we got connected. */
        c->connected_since = atoi(data);
        c->failed_psw_attempts = 0;
        c->failed_auth_attempts = 0;
        c->state = connected;

        SetMenuStatus(c, connected);
        SetTrayIcon(connected);

        SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(IDS_NFO_STATE_CONNECTED));
        SetDlgItemTextW(c->hwndStatus, ID_TXT_IP, ip_txt);
        SetStatusWinIcon(c->hwndStatus, ID_ICO_CONNECTED);

        /* Hide Status Window */
        ShowWindow(c->hwndStatus, SW_HIDE);
    }
    else if (strcmp(state, "RECONNECTING") == 0)
    {
        if (!c->dynamic_cr)
        {
            if (strcmp(message, "auth-failure") == 0)
                c->failed_auth_attempts++;
            else if (strcmp(message, "private-key-password-failure") == 0)
                c->failed_psw_attempts++;
        }

        echo_msg_clear(c, false); /* do not clear history */
        // We change the state to reconnecting only if there was a prior successful connection.
        if (c->state == connected)
        {
            c->state = reconnecting;

            // Update the tray icon
            CheckAndSetTrayIcon();

            // And the texts in the status window
            SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(IDS_NFO_STATE_RECONNECTING));
            SetDlgItemTextW(c->hwndStatus, ID_TXT_IP, L"");
            SetStatusWinIcon(c->hwndStatus, ID_ICO_CONNECTING);
        }
    }
}

static void
SimulateButtonPress(HWND hwnd, UINT btn)
{
    SendMessage(hwnd, WM_COMMAND, MAKEWPARAM(btn, BN_CLICKED), (LPARAM)GetDlgItem(hwnd, btn));
}

/* A private struct to keep autoclose parameters */
typedef struct autoclose {
    UINT start;    /* start time in msec */
    UINT timeout;  /* timeout in msec at which autoclose triggers */
    UINT btn;      /* button which is 'pressed' for autoclose */
    UINT txtid;    /* id of a text control to display an informaltional message */
    UINT txtres;   /* resource id of localized text to use for message:
                      LoadLocalizedString(txtid, time_remaining_in_seconds)
                      is used to generate the message */
    COLORREF txtclr;  /* color for message text */
} autoclose;

/* Cancel scheduled auto close of a dialog */
static void
AutoCloseCancel(HWND hwnd)
{
    autoclose *ac = (autoclose *)GetProp(hwnd, L"AutoClose");
    if (!ac)
        return;

    if (ac->txtid)
        SetDlgItemText(hwnd, ac->txtid, L"");
    KillTimer(hwnd, 1);
    RemoveProp(hwnd, L"AutoClose");
    free(ac);
}

/* Called when autoclose timer expires. */
static void CALLBACK
AutoCloseHandler(HWND hwnd, UINT UNUSED msg, UINT_PTR id, DWORD now)
{
    autoclose *ac = (autoclose *)GetProp(hwnd, L"AutoClose");
    if (!ac)
        return;

    UINT end = ac->start + ac->timeout;
    if (now >= end)
    {
        SimulateButtonPress(hwnd, ac->btn);
        AutoCloseCancel(hwnd);
    }
    else
    {
        SetDlgItemText(hwnd, ac->txtid, LoadLocalizedString(ac->txtres, (end - now)/1000));
        SetTimer(hwnd, id, 500, AutoCloseHandler);
    }
}

/* Schedule an event to automatically activate specified btn after timeout seconds.
 * Used for automatically closing a dialog after some delay unless user interrupts.
 * Optionally a txtid and txtres resource may be specified to display a message.
 * %u in the message is replaced by time remaining before timeout will trigger.
 * Call AutoCloseCancel to cancel the scheduled event and clear the displayed
 * text.
 */
static void
AutoCloseSetup(HWND hwnd, UINT btn, UINT timeout, UINT txtid, UINT txtres)
{
    if (timeout == 0)
        SimulateButtonPress(hwnd, btn);
    else
    {
        autoclose *ac = GetPropW(hwnd, L"AutoClose"); /* reuse if set */
        if (!ac && (ac = malloc(sizeof(autoclose))) == NULL)
            return;

        *ac = (autoclose) {.start = GetTickCount(), .timeout = timeout*1000, .btn = btn,
                  .txtid = txtid, .txtres = txtres, .txtclr = GetSysColor(COLOR_WINDOWTEXT)};

        SetTimer(hwnd, 1, 500, AutoCloseHandler); /* using timer id = 1 */
        if (txtid && txtres)
            SetDlgItemText(hwnd, txtid, LoadLocalizedString(txtres, timeout));
        SetPropW(hwnd, L"AutoClose", (HANDLE) ac);
    }
}

/*
 * DialogProc for OpenVPN username/password/challenge auth dialog windows
 */
INT_PTR CALLBACK
UserAuthDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
    auth_param_t *param;
    WCHAR username[USER_PASS_LEN] = L"";
    WCHAR password[USER_PASS_LEN] = L"";

    switch (msg)
    {
    case WM_INITDIALOG:
        /* Set connection for this dialog and show it */
        param = (auth_param_t *) lParam;
        SetProp(hwndDlg, cfgProp, (HANDLE) param);
        SetStatusWinIcon(hwndDlg, ID_ICO_APP);

        if (param->str)
        {
            LPWSTR wstr = Widen (param->str);
            HWND wnd_challenge = GetDlgItem(hwndDlg, ID_EDT_AUTH_CHALLENGE);

            if (!wstr)
                WriteStatusLog(param->c, L"GUI> ", L"Error converting challenge string to widechar", false);
            else
                SetDlgItemTextW(hwndDlg, ID_TXT_AUTH_CHALLENGE, wstr);

            free(wstr);

            /* Set/Remove style ES_PASSWORD by SetWindowLong(GWL_STYLE) does nothing,
               send EM_SETPASSWORDCHAR just works. */
            if (param->flags & FLAG_CR_ECHO)
                SendMessage(wnd_challenge, EM_SETPASSWORDCHAR, 0, 0);

        }
        if (RecallUsername(param->c->config_name, username))
        {
            SetDlgItemTextW(hwndDlg, ID_EDT_AUTH_USER, username);
            SetFocus(GetDlgItem(hwndDlg, ID_EDT_AUTH_PASS));
        }
        if (RecallAuthPass(param->c->config_name, password))
        {
            SetDlgItemTextW(hwndDlg, ID_EDT_AUTH_PASS, password);
            if (username[0] != L'\0' && !(param->flags & FLAG_CR_TYPE_SCRV1)
                && password[0] != L'\0' && param->c->failed_auth_attempts == 0)
            {
               /* user/pass available and no challenge response needed: skip dialog
                * if silent_connection is on, else auto submit after a few seconds.
                * User can interrupt.
                */
                SetFocus(GetDlgItem(hwndDlg, IDOK));
                UINT timeout = o.silent_connection ? 0 : 6; /* in seconds */
                AutoCloseSetup(hwndDlg, IDOK, timeout, ID_TXT_WARNING, IDS_NFO_AUTO_CONNECT);
            }
            /* if auth failed, highlight password so that user can type over */
            else if (param->c->failed_auth_attempts)
            {
                SendMessage(GetDlgItem(hwndDlg, ID_EDT_AUTH_PASS), EM_SETSEL, 0, MAKELONG(0,-1));
            }
            else if (param->flags & FLAG_CR_TYPE_SCRV1)
            {
                SetFocus(GetDlgItem(hwndDlg, ID_EDT_AUTH_CHALLENGE));
            }
            SecureZeroMemory(password, sizeof(password));
        }
        if (param->c->flags & FLAG_DISABLE_SAVE_PASS)
            ShowWindow(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), SW_HIDE);
        else if (param->c->flags & FLAG_SAVE_AUTH_PASS)
            Button_SetCheck(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_CHECKED);

        SetWindowText (hwndDlg, param->c->config_name);
        if (param->c->failed_auth_attempts > 0)
            SetDlgItemTextW(hwndDlg, ID_TXT_WARNING, LoadLocalizedString(IDS_NFO_AUTH_PASS_RETRY));

        if (param->c->state == resuming)
            ForceForegroundWindow(hwndDlg);
        else
            SetForegroundWindow(hwndDlg);

        break;

    case WM_LBUTTONDOWN:
    case WM_RBUTTONDOWN:
    case WM_NCLBUTTONDOWN:
    case WM_NCRBUTTONDOWN:
        /* user interrupt */
        AutoCloseCancel(hwndDlg);
        break;

    case WM_COMMAND:
        param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
        switch (LOWORD(wParam))
        {
        case ID_EDT_AUTH_USER:
            if (HIWORD(wParam) == EN_UPDATE)
            {
                int len = Edit_GetTextLength((HWND) lParam);
                EnableWindow(GetDlgItem(hwndDlg, IDOK), (len ? TRUE : FALSE));
            }
            AutoCloseCancel(hwndDlg); /* user interrupt */
            break;

        case ID_EDT_AUTH_PASS:
            AutoCloseCancel(hwndDlg); /* user interrupt */
            break;

        case ID_CHK_SAVE_PASS:
            param->c->flags ^= FLAG_SAVE_AUTH_PASS;
            if (param->c->flags & FLAG_SAVE_AUTH_PASS)
                Button_SetCheck(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_CHECKED);
            else
            {
                DeleteSavedAuthPass(param->c->config_name);
                Button_SetCheck(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_UNCHECKED);
            }
            AutoCloseCancel(hwndDlg); /* user interrupt */
            break;

        case IDOK:
            if (GetDlgItemTextW(hwndDlg, ID_EDT_AUTH_USER, username, _countof(username)))
            {
                if (!validate_input(username, L"\n"))
                {
                    show_error_tip(GetDlgItem(hwndDlg, ID_EDT_AUTH_USER), LoadLocalizedString(IDS_ERR_INVALID_USERNAME_INPUT));
                    return 0;
                }
                SaveUsername(param->c->config_name, username);
            }
            if (GetDlgItemTextW(hwndDlg, ID_EDT_AUTH_PASS, password, _countof(password)))
            {
                if (!validate_input(password, L"\n"))
                {
                    show_error_tip(GetDlgItem(hwndDlg, ID_EDT_AUTH_PASS), LoadLocalizedString(IDS_ERR_INVALID_PASSWORD_INPUT));
                    SecureZeroMemory(password, sizeof(password));
                    return 0;
                }
                if ( param->c->flags & FLAG_SAVE_AUTH_PASS && wcslen(password) )
                {
                    SaveAuthPass(param->c->config_name, password);
                }
                SecureZeroMemory(password, sizeof(password));
            }
            ManagementCommandFromInput(param->c, "username \"Auth\" \"%s\"", hwndDlg, ID_EDT_AUTH_USER);
            if (param->flags & FLAG_CR_TYPE_SCRV1)
                ManagementCommandFromInputBase64(param->c, "password \"Auth\" \"SCRV1:%s:%s\"", hwndDlg, ID_EDT_AUTH_PASS, ID_EDT_AUTH_CHALLENGE);
            else
                ManagementCommandFromInput(param->c, "password \"Auth\" \"%s\"", hwndDlg, ID_EDT_AUTH_PASS);
            EndDialog(hwndDlg, LOWORD(wParam));
            return TRUE;

        case IDCANCEL:
            EndDialog(hwndDlg, LOWORD(wParam));
            StopOpenVPN(param->c);
            return TRUE;
        }
        break;

    case WM_CTLCOLORSTATIC:
        if (GetDlgCtrlID((HWND) lParam) == ID_TXT_WARNING)
        {
            autoclose *ac = (autoclose *)GetProp(hwndDlg, L"AutoClose");
            HBRUSH br = (HBRUSH) DefWindowProc(hwndDlg, msg, wParam, lParam);
            /* This text id is used for auth failure warning or autoclose message. Use appropriate color */
            COLORREF clr = o.clr_warning;
            if (ac && ac->txtid == ID_TXT_WARNING)
                clr = ac->txtclr;
            SetTextColor((HDC) wParam, clr);
            return (INT_PTR) br;
        }
        break;

    case WM_CLOSE:
        EndDialog(hwndDlg, LOWORD(wParam));
        param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
        StopOpenVPN(param->c);
        return TRUE;

    case WM_NCDESTROY:
        param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
        free_auth_param (param);
        AutoCloseCancel(hwndDlg);
        RemoveProp(hwndDlg, cfgProp);
        break;
    }

    return FALSE;
}

/*
 * DialogProc for challenge-response, token PIN etc.
 */
INT_PTR CALLBACK
GenericPassDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
    auth_param_t *param;
    WCHAR password[USER_PASS_LEN];

    switch (msg)
    {
    case WM_INITDIALOG:
        param = (auth_param_t *) lParam;
        SetProp(hwndDlg, cfgProp, (HANDLE) param);

        WCHAR *wstr = Widen (param->str);
        if (!wstr)
        {
            WriteStatusLog(param->c, L"GUI> ", L"Error converting challenge string to widechar", false);
            EndDialog(hwndDlg, LOWORD(wParam));
            break;
        }
        if (param->flags & FLAG_CR_TYPE_CRV1)
        {
            SetDlgItemTextW(hwndDlg, ID_TXT_DESCRIPTION, wstr);

            /* Set password echo on if needed */
            if (param->flags & FLAG_CR_ECHO)
                SendMessage(GetDlgItem(hwndDlg, ID_EDT_RESPONSE), EM_SETPASSWORDCHAR, 0, 0);
        }
        else if (param->flags & FLAG_PASS_TOKEN)
        {
            SetWindowText(hwndDlg, LoadLocalizedString(IDS_NFO_TOKEN_PASSWORD_CAPTION));
            SetDlgItemText(hwndDlg, ID_TXT_DESCRIPTION, LoadLocalizedString(IDS_NFO_TOKEN_PASSWORD_REQUEST, param->id));
        }
        else
        {
            WriteStatusLog(param->c, L"GUI> ", L"Unknown password request", false);
            SetDlgItemText(hwndDlg, ID_TXT_DESCRIPTION, wstr);
        }
        free(wstr);

        AppendTextToCaption (hwndDlg, param->c->config_name);
        if (param->c->state == resuming)
            ForceForegroundWindow(hwndDlg);
        else
            SetForegroundWindow(hwndDlg);

        break;

    case WM_COMMAND:
        param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
        const char *template;
        char *fmt;
        switch (LOWORD(wParam))
        {
        case IDOK:
            if (GetDlgItemTextW(hwndDlg, ID_EDT_RESPONSE, password, _countof(password))
                && !validate_input(password, L"\n"))
            {
                show_error_tip(GetDlgItem(hwndDlg, ID_EDT_RESPONSE), LoadLocalizedString(IDS_ERR_INVALID_PASSWORD_INPUT));
                SecureZeroMemory(password, sizeof(password));
                return 0;
            }
            if (param->flags & FLAG_CR_TYPE_CRV1)
            {
                /* send username */
                template = "username \"Auth\" \"%s\"";
                fmt = malloc(strlen(template) + strlen(param->user));

                if (fmt)
                {
                    sprintf(fmt, template, param->user);
                    ManagementCommand(param->c, fmt, NULL, regular);
                    free(fmt);
                }
                else /* no memory? send an emty username and let it error out */
                {
                    WriteStatusLog(param->c, L"GUI> ",
                        L"Out of memory: sending a generic username for dynamic CR", false);
                    ManagementCommand(param->c, "username \"Auth\" \"user\"", NULL, regular);
                }

                /* password template */
                template = "password \"Auth\" \"CRV1::%s::%%s\"";
            }
            else /* generic password request of type param->id */
            {
                template = "password \"%s\" \"%%s\"";
            }

            fmt = malloc(strlen(template) + strlen(param->id));
            if (fmt)
            {
                sprintf(fmt, template, param->id);
                PrintDebug(L"Send passwd to mgmt with format: '%S'", fmt);
                ManagementCommandFromInput(param->c, fmt, hwndDlg, ID_EDT_RESPONSE);
                free (fmt);
            }
            else /* no memory? send stop signal */
            {
                WriteStatusLog(param->c, L"GUI> ",
                    L"Out of memory in password dialog: sending stop signal", false);
                StopOpenVPN (param->c);
            }

            EndDialog(hwndDlg, LOWORD(wParam));
            return TRUE;

        case IDCANCEL:
            EndDialog(hwndDlg, LOWORD(wParam));
            StopOpenVPN(param->c);
            return TRUE;
        }
        break;

    case WM_CLOSE:
        EndDialog(hwndDlg, LOWORD(wParam));
        return TRUE;

    case WM_NCDESTROY:
        param = (auth_param_t *) GetProp(hwndDlg, cfgProp);
        free_auth_param (param);
        RemoveProp(hwndDlg, cfgProp);
        break;
    }

    return FALSE;
}

/*
 * DialogProc for OpenVPN private key password dialog windows
 */
INT_PTR CALLBACK
PrivKeyPassDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
    connection_t *c;
    WCHAR passphrase[KEY_PASS_LEN];

    switch (msg)
    {
    case WM_INITDIALOG:
        /* Set connection for this dialog and show it */
        c = (connection_t *) lParam;
        SetProp(hwndDlg, cfgProp, (HANDLE) c);
        AppendTextToCaption (hwndDlg, c->config_name);
        if (RecallKeyPass(c->config_name, passphrase) && wcslen(passphrase)
            && c->failed_psw_attempts == 0)
        {
            /* Use the saved password and skip the dialog */
            SetDlgItemTextW(hwndDlg, ID_EDT_PASSPHRASE, passphrase);
            SecureZeroMemory(passphrase, sizeof(passphrase));
            ManagementCommandFromInput(c, "password \"Private Key\" \"%s\"", hwndDlg, ID_EDT_PASSPHRASE);
            EndDialog(hwndDlg, IDOK);
            return TRUE;
        }
        if (c->flags & FLAG_DISABLE_SAVE_PASS)
            ShowWindow(GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), SW_HIDE);
        else if (c->flags & FLAG_SAVE_KEY_PASS)
            Button_SetCheck (GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_CHECKED);
        if (c->failed_psw_attempts > 0)
            SetDlgItemTextW(hwndDlg, ID_TXT_WARNING, LoadLocalizedString(IDS_NFO_KEY_PASS_RETRY));
        if (c->state == resuming)
            ForceForegroundWindow(hwndDlg);
        else
            SetForegroundWindow(hwndDlg);
        break;

    case WM_COMMAND:
        c = (connection_t *) GetProp(hwndDlg, cfgProp);
        switch (LOWORD(wParam))
        {
        case ID_CHK_SAVE_PASS:
            c->flags ^= FLAG_SAVE_KEY_PASS;
            if (c->flags & FLAG_SAVE_KEY_PASS)
                Button_SetCheck (GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_CHECKED);
            else
            {
                Button_SetCheck (GetDlgItem (hwndDlg, ID_CHK_SAVE_PASS), BST_UNCHECKED);
                DeleteSavedKeyPass(c->config_name);
            }
            break;

        case IDOK:
            if (GetDlgItemTextW(hwndDlg, ID_EDT_PASSPHRASE, passphrase, _countof(passphrase)))
            {
                if (!validate_input(passphrase, L"\n"))
                {
                    show_error_tip(GetDlgItem(hwndDlg, ID_EDT_PASSPHRASE), LoadLocalizedString(IDS_ERR_INVALID_PASSWORD_INPUT));
                    SecureZeroMemory(passphrase, sizeof(passphrase));
                    return 0;
                }
                if ((c->flags & FLAG_SAVE_KEY_PASS) && wcslen(passphrase) > 0)
                {
                    SaveKeyPass(c->config_name, passphrase);
                }
                SecureZeroMemory(passphrase, sizeof(passphrase));
            }
            ManagementCommandFromInput(c, "password \"Private Key\" \"%s\"", hwndDlg, ID_EDT_PASSPHRASE);
            EndDialog(hwndDlg, LOWORD(wParam));
            return TRUE;

        case IDCANCEL:
            EndDialog(hwndDlg, LOWORD(wParam));
            StopOpenVPN (c);
            return TRUE;
        }
        break;

    case WM_CTLCOLORSTATIC:
        if (GetDlgCtrlID((HWND) lParam) == ID_TXT_WARNING)
        {
            HBRUSH br = (HBRUSH) DefWindowProc(hwndDlg, msg, wParam, lParam);
            SetTextColor((HDC) wParam, o.clr_warning);
            return (INT_PTR) br;
        }
        break;

    case WM_CLOSE:
        EndDialog(hwndDlg, LOWORD(wParam));
        return TRUE;

    case WM_NCDESTROY:
        RemoveProp(hwndDlg, cfgProp);
        break;
  }
  return FALSE;
}

static void
free_dynamic_cr (connection_t *c)
{
    free (c->dynamic_cr);
    c->dynamic_cr = NULL;
}

/*
 * Parse dynamic challenge string received from the server. Returns
 * true on success. The caller must free param->str and param->id
 * even on error.
 */
static BOOL
parse_dynamic_cr (const char *str, auth_param_t *param)
{
    BOOL ret = FALSE;
    char *token[4] = {0};
    char *p = strdup (str);

    int i;
    char *p1;

    if (!param || !p) goto out;

    /* expected: str = "E,R:challenge_id:user_b64:challenge_str" */
    for (i = 0, p1 = p; i < 4; ++i, p1 = NULL)
    {
        token[i] = strtok (p1, ":"); /* strtok is thread-safe on Windows */
        if (!token[i])
        {
            WriteStatusLog(param->c, L"GUI> ", L"Error parsing dynamic challenge string", false);
            goto out;
        }
    }

    if (Base64Decode(token[2], &param->user) < 0)
    {
        WriteStatusLog(param->c, L"GUI> ", L"Error decoding the username in dynamic challenge string", false);
        goto out;
    }

    param->flags |= FLAG_CR_TYPE_CRV1;
    param->flags |= strchr(token[0], 'E') ? FLAG_CR_ECHO : 0;
    param->flags |= strchr(token[0], 'R') ? FLAG_CR_RESPONSE : 0;
    param->id = strdup(token[1]);
    param->str = strdup(token[3]);
    if (!param->id || !param->str)
        goto out;

    ret = TRUE;

out:
    free (p);
    return ret;
}

/*
 * Parse password or string request of the form "Need 'What' password/string MSG:message"
 * and assign param->id = What, param->str = message. Also set param->flags if the type
 * of the requested info is known. If message is empty param->id is copied to param->str.
 * Return true on succsess. The caller must free param even when the function fails.
 */
static BOOL
parse_input_request (const char *msg, auth_param_t *param)
{
    BOOL ret = FALSE;
    char *p = strdup (msg);
    char *sep[4] = {" ", "'", " ", ""}; /* separators to use to break up msg */
    char *token[4];

    char *p1 = p;
    for (int i = 0; i < 4; ++i, p1 = NULL)
    {
        token[i] = strtok (p1, sep[i]); /* strtok is thread-safe on Windows */
        if (!token[i] && i < 3) /* first three tokens required */
            goto out;
    }
    if (token[3] && strncmp(token[3], "MSG:", 4) == 0)
        token[3] += 4;
    if (!token[3] || !*token[3]) /* use id as the description if none provided */
        token[3] = token[1];

    PrintDebug (L"Tokens: '%S' '%S' '%S' '%S'", token[0], token[1],
                token[2], token[3]);

    if (strcmp (token[0], "Need") != 0)
        goto out;

    if ((param->id = strdup(token[1])) == NULL)
        goto out;

    if (strcmp(token[2], "password") == 0)
    {
        if (strcmp (param->id, "Private Key") == 0)
            param->flags |= FLAG_PASS_PKEY;
        else
            param->flags |= FLAG_PASS_TOKEN;
    }
    else if (strcmp(token[2], "string") == 0
             && strcmp (param->id, "pkcs11-id-request") == 0)
    {
        param->flags |= FLAG_STRING_PKCS11;
    }

    param->str = strdup (token[3]);
    if (param->str == NULL)
        goto out;

    PrintDebug (L"parse_input_request: id = '%S' str = '%S' flags = %u",
                param->id, param->str, param->flags);
    ret = TRUE;

out:
    free (p);
    if (!ret)
        PrintDebug (L"Error parsing password/string request msg: <%S>", msg);
    return ret;
}

/*
 * Handle >ECHO: request from OpenVPN management interface
 * Expect msg = timestamp,message
 */
void
OnEcho(connection_t *c, char *msg)
{
    time_t timestamp = strtoul(msg, NULL, 10); /* openvpn prints these as %u */

    PrintDebug(L"OnEcho with msg = %S", msg);
    if (!(msg = strchr(msg, ',')))
    {
        PrintDebug(L"OnEcho: msg format not recognized");
        return;
    }
    msg++;
    if (strcmp(msg, "forget-passwords") == 0)
    {
        DeleteSavedPasswords(c->config_name);
    }
    else if (strcmp(msg, "save-passwords") == 0)
    {
        if (c->flags & FLAG_DISABLE_SAVE_PASS)
            WriteStatusLog(c, L"GUI> echo save-passwords: ",
               L"Ignored as disable_save_passwords is enabled.", false);
        else
            c->flags |= (FLAG_SAVE_KEY_PASS | FLAG_SAVE_AUTH_PASS);
    }
    else if (strbegins(msg, "setenv "))
    {
        process_setenv(c, timestamp, msg);
    }
    else if (strbegins(msg, "msg"))
    {
        echo_msg_process(c, timestamp, msg);
    }
    else
    {
        wchar_t errmsg[256];
        _sntprintf_0(errmsg, L"WARNING: Unknown ECHO directive '%hs' ignored.", msg);
        WriteStatusLog(c, L"GUI> ", errmsg, false);
    }
}

/*
 * Handle >PASSWORD: request from OpenVPN management interface
 */
void
OnPassword(connection_t *c, char *msg)
{
    PrintDebug(L"OnPassword with msg = %S", msg);
    if (strncmp(msg, "Verification Failed", 19) == 0)
    {
        /* If the failure is due to dynamic challenge save the challenge string */
        char *chstr = strstr(msg, "CRV1:");

        free_dynamic_cr (c);
        if (chstr)
        {
            chstr += 5; /* beginning of dynamic CR string */

            /* Check if a response is required: ie.,  starts with R or E,R */
            if (strncmp (chstr, "R", 1) != 0 && strncmp (chstr, "E,R", 3) != 0)
            {
                PrintDebug(L"Got dynamic challenge request with no response required: <%S>", chstr);
                return;
            }

            /* Save the string for later processing during next Auth request */
            c->dynamic_cr = strdup(chstr);
            if (c->dynamic_cr && (chstr =  strstr (c->dynamic_cr, "']")) != NULL)
                *chstr = '\0';

            PrintDebug(L"Got dynamic challenge: <%S>", c->dynamic_cr);
        }

        return;
    }

    if (strstr(msg, "'Auth'"))
    {
        char *chstr;
        auth_param_t *param = (auth_param_t *) calloc(1, sizeof(auth_param_t));

        if (!param)
        {
            WriteStatusLog (c, L"GUI> ", L"Error: Out of memory - ignoring user-auth request", false);
            return;
        }
        param->c = c;

        if (c->dynamic_cr)
        {
            if (!parse_dynamic_cr (c->dynamic_cr, param))
            {
                WriteStatusLog (c, L"GUI> ", L"Error parsing dynamic challenge string", FALSE);
                free_dynamic_cr (c);
                free_auth_param (param);
                return;
            }
            LocalizedDialogBoxParam(ID_DLG_CHALLENGE_RESPONSE, GenericPassDialogFunc, (LPARAM) param);
            free_dynamic_cr (c);
        }
        else if ( (chstr = strstr(msg, "SC:")) && strlen (chstr) > 5)
        {
            param->flags |= FLAG_CR_TYPE_SCRV1;
            param->flags |= (*(chstr + 3) != '0') ? FLAG_CR_ECHO : 0;
            param->str = strdup(chstr + 5);
            LocalizedDialogBoxParam(ID_DLG_AUTH_CHALLENGE, UserAuthDialogFunc, (LPARAM) param);
        }
        else
        {
            LocalizedDialogBoxParam(ID_DLG_AUTH, UserAuthDialogFunc, (LPARAM) param);
        }
    }
    else if (strstr(msg, "'Private Key'"))
    {
        LocalizedDialogBoxParam(ID_DLG_PASSPHRASE, PrivKeyPassDialogFunc, (LPARAM) c);
    }
    else if (strstr(msg, "'HTTP Proxy'"))
    {
        QueryProxyAuth(c, http);
    }
    else if (strstr(msg, "'SOCKS Proxy'"))
    {
        QueryProxyAuth(c, socks);
    }
    /* All other password requests such as PKCS11 pin */
    else if (strncmp(msg, "Need '", 6) == 0)
    {
        auth_param_t *param = (auth_param_t *) calloc(1, sizeof(auth_param_t));

        if (!param)
        {
            WriteStatusLog (c, L"GUI> ", L"Error: Out of memory - ignoring user-auth request", false);
            return;
        }
        param->c = c;
        if (!parse_input_request (msg, param))
        {
            free_auth_param(param);
            return;
        }
        LocalizedDialogBoxParam(ID_DLG_CHALLENGE_RESPONSE, GenericPassDialogFunc, (LPARAM) param);
    }
}


/*
 * Handle exit of the OpenVPN process
 */
void
OnStop(connection_t *c, UNUSED char *msg)
{
    UINT txt_id, msg_id;
    TCHAR *msg_xtra;
    SetMenuStatus(c, disconnected);

    switch (c->state)
    {
    case connected:
        /* OpenVPN process ended unexpectedly */
        c->failed_psw_attempts = 0;
        c->failed_auth_attempts = 0;
        c->state = disconnected;
        CheckAndSetTrayIcon();
        SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(IDS_NFO_STATE_DISCONNECTED));
        SetStatusWinIcon(c->hwndStatus, ID_ICO_DISCONNECTED);
        EnableWindow(GetDlgItem(c->hwndStatus, ID_DISCONNECT), FALSE);
        EnableWindow(GetDlgItem(c->hwndStatus, ID_RESTART), FALSE);
        if (o.silent_connection == 0)
        {
            SetForegroundWindow(c->hwndStatus);
            ShowWindow(c->hwndStatus, SW_SHOW);
        }
        MessageBox(c->hwndStatus, LoadLocalizedString(IDS_NFO_CONN_TERMINATED, c->config_file),
                   _T(PACKAGE_NAME), MB_OK);
        SendMessage(c->hwndStatus, WM_CLOSE, 0, 0);
        break;

    case resuming:
    case connecting:
    case reconnecting:
    case timedout:
        /* We have failed to (re)connect */
        txt_id = c->state == reconnecting ? IDS_NFO_STATE_FAILED_RECONN : IDS_NFO_STATE_FAILED;
        msg_id = c->state == reconnecting ? IDS_NFO_RECONN_FAILED : IDS_NFO_CONN_FAILED;
        msg_xtra = c->state == timedout ? c->log_path : c->config_name;
        if (c->state == timedout)
            msg_id = IDS_NFO_CONN_TIMEOUT;

        c->state = disconnecting;
        CheckAndSetTrayIcon();
        c->state = disconnected;
        EnableWindow(GetDlgItem(c->hwndStatus, ID_DISCONNECT), FALSE);
        EnableWindow(GetDlgItem(c->hwndStatus, ID_RESTART), FALSE);
        SetStatusWinIcon(c->hwndStatus, ID_ICO_DISCONNECTED);
        SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(txt_id));
        if (o.silent_connection == 0)
        {
            SetForegroundWindow(c->hwndStatus);
            ShowWindow(c->hwndStatus, SW_SHOW);
        }
        MessageBox(c->hwndStatus, LoadLocalizedString(msg_id, msg_xtra), _T(PACKAGE_NAME), MB_OK);
        SendMessage(c->hwndStatus, WM_CLOSE, 0, 0);
        break;

    case disconnecting:
//   /* Check for "certificate has expired" message */
//   if ((strstr(line, "error=certificate has expired") != NULL))
//     {
//       StopOpenVPN(config);
//       /* Cert expired... */
//       ShowLocalizedMsg(IDS_ERR_CERT_EXPIRED);
//     }
//
//   /* Check for "certificate is not yet valid" message */
//   if ((strstr(line, "error=certificate is not yet valid") != NULL))
//     {
//       StopOpenVPN(config);
//       /* Cert not yet valid */
//       ShowLocalizedMsg(IDS_ERR_CERT_NOT_YET_VALID);
//     }
        /* Shutdown was initiated by us */
        c->failed_psw_attempts = 0;
        c->failed_auth_attempts = 0;
        c->state = disconnected;
        CheckAndSetTrayIcon();
        SendMessage(c->hwndStatus, WM_CLOSE, 0, 0);
        break;

    case suspending:
        c->state = suspended;
        CheckAndSetTrayIcon();
        SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(IDS_NFO_STATE_SUSPENDED));
        break;

    default:
        break;
    }
}

/* Convert bytecount c to a human readable string.
 * Input c converted to a string of the form "nnn.. (xxx.y XiB)"
 * where X is K, M, G, T, P or E depending on the count. The result
 * is returned in buf up to max of len - 1 wide characters.
 * Return value: pointer to buf.
 */
static wchar_t *
format_bytecount(wchar_t *buf, size_t len, unsigned long long c)
{
    const char *suf[] = {"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", NULL};
    const char **s = suf;
    double x = c;

    if (c <= 1024)
    {
        swprintf(buf, len, L"%I64u B", c);
        buf[len-1] = L'\0';
        return buf;
    }
    while (x > 1024 && *(s+1))
    {
        x /= 1024.0;
        s++;
    }
    swprintf(buf, len, L"%I64u (%.1f %hs)", c, x, *s);
    buf[len-1] = L'\0';

    return buf;
}

/*
 * Handle bytecount report from OpenVPN
 * Expect bytes-in,bytes-out
 */
void OnByteCount(connection_t *c, char *msg)
{
    if (!msg || sscanf(msg, "%I64u,%I64u", &c->bytes_in, &c->bytes_out) != 2)
        return;
    wchar_t in[32], out[32];
    format_bytecount(in, _countof(in), c->bytes_in);
    format_bytecount(out, _countof(out), c->bytes_out);
    SetDlgItemTextW(c->hwndStatus, ID_TXT_BYTECOUNT,
            LoadLocalizedString(IDS_NFO_BYTECOUNT, in, out));
}

/*
 * Break a long line into shorter segments
 */
static WCHAR *
WrapLine (WCHAR *line)
{
    int i = 0;
    WCHAR *next = NULL;
    int len = 80;

    for (i = 0; *line; i++, ++line)
    {
        if ((*line == L'\r') || (*line == L'\n'))
            *line = L' ';
        if (next && i > len) break;
        if (iswspace(*line))  next = line;
    }
    if (!*line) next = NULL;
    if (next)
    {
        *next = L'\0';
        ++next;
    }
    return next;
}

/*
 * Write a line to the status log window and optionally to the log file
 */
void
WriteStatusLog (connection_t *c, const WCHAR *prefix, const WCHAR *line, BOOL fileio)
{
    HWND logWnd = GetDlgItem(c->hwndStatus, ID_EDT_LOG);
    FILE *log_fd;
    time_t now;
    WCHAR datetime[26];

    time (&now);
    /* TODO: change this to use _wctime_s when mingw supports it */
    wcsncpy (datetime, _wctime(&now), _countof(datetime));
    datetime[24] = L' ';

    /* Remove lines from log window if it is getting full */
    if (SendMessage(logWnd, EM_GETLINECOUNT, 0, 0) > MAX_LOG_LINES)
    {
        int pos = SendMessage(logWnd, EM_LINEINDEX, DEL_LOG_LINES, 0);
        SendMessage(logWnd, EM_SETSEL, 0, pos);
        SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) _T(""));
    }
    /* Append line to log window */
    SendMessage(logWnd, EM_SETSEL, (WPARAM) -1, (LPARAM) -1);
    SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) datetime);
    SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) prefix);
    SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) line);
    SendMessage(logWnd, EM_REPLACESEL, FALSE, (LPARAM) L"\n");

    if (!fileio) return;

    log_fd = _tfopen (c->log_path, TEXT("at+,ccs=UTF-8"));
    if (log_fd)
    {
        fwprintf (log_fd, L"%s%s%s\n", datetime, prefix, line);
        fclose (log_fd);
    }
}

#define IO_TIMEOUT 5000 /* milliseconds */

static void
CloseServiceIO (service_io_t *s)
{
    if (s->hEvent)
        CloseHandle(s->hEvent);
    s->hEvent = NULL;
    if (s->pipe && s->pipe != INVALID_HANDLE_VALUE)
        CloseHandle(s->pipe);
    s->pipe = NULL;
}

/*
 * Open the service pipe and initialize service I/O.
 * Failure is not fatal.
 */
static BOOL
InitServiceIO (service_io_t *s)
{
    DWORD dwMode = PIPE_READMODE_MESSAGE;
    CLEAR(*s);

    /* auto-reset event used for signalling i/o completion*/
    s->hEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
    if (!s->hEvent)
    {
        return FALSE;
    }

    s->pipe = CreateFile(_T("\\\\.\\pipe\\openvpn\\service"),
                GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);

    if ( !s->pipe                                               ||
         s->pipe == INVALID_HANDLE_VALUE                        ||
         !SetNamedPipeHandleState(s->pipe, &dwMode, NULL, NULL)
       )
    {
        CloseServiceIO (s);
        return FALSE;
    }

    return TRUE;
}

/*
 * Read-completion routine for interactive service pipe. Call with
 * err = 0, bytes = 0 to queue a new read request.
 */
static void WINAPI
HandleServiceIO (DWORD err, DWORD bytes, LPOVERLAPPED lpo)
{
    service_io_t *s = (service_io_t *) lpo;
    int len, capacity;

    len = _countof(s->readbuf);
    capacity = (len-1)*sizeof(*(s->readbuf));

    if (bytes > 0)
    {
        /* messages from the service are not nul terminated */
        int nchars = bytes/sizeof(s->readbuf[0]);
        s->readbuf[nchars] = L'\0';
        SetEvent (s->hEvent);
        return;
    }
    if (err)
    {
        _snwprintf(s->readbuf, len, L"0x%08x\nInteractive Service disconnected\n", err);
        s->readbuf[len-1] = L'\0';
        SetEvent (s->hEvent);
        return;
    }

    /* Otherwise queue next read request */
    ReadFileEx (s->pipe, s->readbuf, capacity, lpo, HandleServiceIO);
    /* Any error in the above call will get checked in next round */
}

/*
 * Write size bytes in buf to the pipe with a timeout.
 * Retun value: TRUE on success FLASE on error
 */
static BOOL
WritePipe (HANDLE pipe, LPVOID buf, DWORD size)
{
    OVERLAPPED o;
    BOOL retval = FALSE;

    CLEAR(o);
    o.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);

    if (!o.hEvent)
    {
        return retval;
    }

    if (WriteFile (pipe, buf, size, NULL, &o)  ||
        GetLastError() == ERROR_IO_PENDING )
    {
        if (WaitForSingleObject(o.hEvent, IO_TIMEOUT) == WAIT_OBJECT_0)
            retval = TRUE;
        else
            CancelIo (pipe);
            // TODO report error -- timeout
    }

    CloseHandle(o.hEvent);
    return retval;
}

/*
 * Called when read from service pipe signals
 */
static void
OnService(connection_t *c, UNUSED char *msg)
{
    DWORD err = 0;
    DWORD pid = 0;
    WCHAR *p, *buf, *next;
    const WCHAR *prefix = L"IService> ";

    /*
     * Duplicate the read buffer and queue the next read request
     * by calling HandleServiceIO with err = 0, bytes = 0.
     */
    buf = wcsdup(c->iserv.readbuf);
    HandleServiceIO(0, 0, (LPOVERLAPPED) &c->iserv);

    if (buf == NULL) return;

    /* messages from the service are in the format "0x08x\n%s\n%s" */
    if (swscanf (buf, L"0x%08x\n", &err) != 1)
    {
        free (buf);
        return;
    }

    p = buf + 11;
    /* next line is the pid if followed by "\nProcess ID" */
    if (!err && wcsstr(p, L"\nProcess ID") && swscanf (p, L"0x%08x", &pid) == 1 && pid != 0)
    {
        PrintDebug (L"Process ID of openvpn started by IService: %d", pid);
        c->hProcess = OpenProcess (PROCESS_TERMINATE|PROCESS_QUERY_INFORMATION, FALSE, pid);
        if (!c->hProcess)
            PrintDebug (L"Failed to get process handle from pid of openvpn: error = %lu",
                        GetLastError());
        free (buf);
        return;
    }

    while (iswspace(*p)) ++p;

    while (p && *p)
    {
        next = WrapLine (p);
        WriteStatusLog (c, prefix, p, false);
        p = next;
    }
    free (buf);

    /* Error from iservice before management interface is connected */
    switch (err)
    {
        case 0:
            break;
        case ERROR_STARTUP_DATA:
            WriteStatusLog (c, prefix, L"OpenVPN not started due to previous errors", true);
            c->state = timedout;   /* Force the popup message to include the log file name */
            OnStop (c, NULL);
            break;
        case ERROR_OPENVPN_STARTUP:
            WriteStatusLog (c, prefix, L"Check the log file for details", false);
            c->state = timedout;   /* Force the popup message to include the log file name */
            OnStop(c, NULL);
            break;
        default:
            /* Unknown failure: let management connection timeout */
            break;
    }
}

/*
 * Called when the directly started openvpn process exits
 */
static void
OnProcess (connection_t *c, UNUSED char *msg)
{
    DWORD err;
    WCHAR tmp[256];

    if (!GetExitCodeProcess(c->hProcess, &err) || err == STILL_ACTIVE)
        return;

    _snwprintf(tmp, _countof(tmp),  L"OpenVPN terminated with exit code %lu. "
                                    L"See the log file for details", err);
    tmp[_countof(tmp)-1] = L'\0';
    WriteStatusLog(c, L"OpenVPN GUI> ", tmp, false);

    OnStop (c, NULL);
}

/*
 * Called when NEED-OK is received
 */
void
OnNeedOk (connection_t *c, char *msg)
{
    char *resp = NULL;
    WCHAR *wstr = NULL;
    auth_param_t *param = (auth_param_t *) calloc(1, sizeof(auth_param_t));

    if (!param)
    {
        WriteStatusLog(c, L"GUI> ", L"Error: out of memory while processing NEED-OK. Sending stop signal", false);
        StopOpenVPN(c);
        return;
    }
    if (!parse_input_request(msg, param))
        goto out;

    /* allocate space for response : "needok param->id cancel/ok" */
    resp = malloc (strlen(param->id) + strlen("needok \' \' cancel"));
    wstr = Widen(param->str);

    if (!wstr || !resp)
    {
        WriteStatusLog(c, L"GUI> ", L"Error: out of memory while processing NEED-OK. Sending stop signal", false);
        StopOpenVPN(c);
        goto out;
    }

    const char *fmt;
    if (MessageBoxW (NULL, wstr, L""PACKAGE_NAME, MB_OKCANCEL) == IDOK)
    {
        fmt = "needok \'%s\' ok";
    }
    else
    {
        ManagementCommand (c, "auth-retry none", NULL, regular);
        fmt = "needok \'%s\' cancel";
    }

    sprintf (resp, fmt, param->id);
    ManagementCommand (c, resp, NULL, regular);

out:
    free_auth_param (param);
    free(wstr);
    free(resp);
}

/*
 * Called when NEED-STR is received
 */
void
OnNeedStr (connection_t *c, UNUSED char *msg)
{
    WriteStatusLog (c, L"GUI> ", L"Error: Received NEED-STR message -- not implemented", false);
}

/*
 * Close open handles
 */
static void
Cleanup (connection_t *c)
{
    CloseManagement (c);

    free_dynamic_cr (c);
    env_item_del_all(c->es);
    c->es = NULL;
    echo_msg_clear(c, true); /* clear history */

    if (c->hProcess)
        CloseHandle (c->hProcess);
    c->hProcess = NULL;

    if (c->iserv.hEvent)
        CloseServiceIO (&c->iserv);

    if (c->exit_event)
        CloseHandle (c->exit_event);
    c->exit_event = NULL;
}
/*
 * Helper to position and scale widgets in status window using current dpi
 * Takes status window width and height in screen pixels as input
 */
void
RenderStatusWindow(HWND hwndDlg, UINT w, UINT h)
{
        MoveWindow(GetDlgItem(hwndDlg, ID_EDT_LOG), DPI_SCALE(20), DPI_SCALE(25), w - DPI_SCALE(40), h - DPI_SCALE(110), TRUE);
        MoveWindow(GetDlgItem(hwndDlg, ID_TXT_STATUS), DPI_SCALE(20), DPI_SCALE(5), w-DPI_SCALE(30), DPI_SCALE(15), TRUE);
        MoveWindow(GetDlgItem(hwndDlg, ID_TXT_IP), DPI_SCALE(20), h - DPI_SCALE(75), w-DPI_SCALE(30), DPI_SCALE(15), TRUE);
        MoveWindow(GetDlgItem(hwndDlg, ID_TXT_BYTECOUNT), DPI_SCALE(20), h - DPI_SCALE(55), w-DPI_SCALE(210), DPI_SCALE(15), TRUE);
        MoveWindow(GetDlgItem(hwndDlg, ID_TXT_VERSION), w-DPI_SCALE(180), h - DPI_SCALE(55), DPI_SCALE(170), DPI_SCALE(15), TRUE);
        MoveWindow(GetDlgItem(hwndDlg, ID_DISCONNECT), DPI_SCALE(20), h - DPI_SCALE(30), DPI_SCALE(110), DPI_SCALE(23), TRUE);
        MoveWindow(GetDlgItem(hwndDlg, ID_RESTART), DPI_SCALE(145), h - DPI_SCALE(30), DPI_SCALE(110), DPI_SCALE(23), TRUE);
        MoveWindow(GetDlgItem(hwndDlg, ID_HIDE), w - DPI_SCALE(130), h - DPI_SCALE(30), DPI_SCALE(110), DPI_SCALE(23), TRUE);
}

/*
 * DialogProc for OpenVPN status dialog windows
 */
INT_PTR CALLBACK
StatusDialogFunc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
    connection_t *c;

    switch (msg)
    {
    case WM_MANAGEMENT:
        /* Management interface related event */
        OnManagement(wParam, lParam);
        return TRUE;

    case WM_INITDIALOG:
        c = (connection_t *) lParam;

        /* Set window icon "disconnected" */
        SetStatusWinIcon(hwndDlg, ID_ICO_CONNECTING);

        /* Set connection for this dialog */
        SetProp(hwndDlg, cfgProp, (HANDLE) c);

        /* Create log window */
        HWND hLogWnd = CreateWindowEx(0, RICHEDIT_CLASS, NULL,
            WS_CHILD|WS_VISIBLE|WS_HSCROLL|WS_VSCROLL|ES_SUNKEN|ES_LEFT|
            ES_MULTILINE|ES_READONLY|ES_AUTOHSCROLL|ES_AUTOVSCROLL,
            20, 25, 350, 160, hwndDlg, (HMENU) ID_EDT_LOG, o.hInstance, NULL);
        if (!hLogWnd)
        {
            ShowLocalizedMsg(IDS_ERR_CREATE_EDIT_LOGWINDOW);
            return FALSE;
        }

        /* Set font and fontsize of the log window */
        CHARFORMAT cfm = {
            .cbSize = sizeof(CHARFORMAT),
            .dwMask = CFM_SIZE|CFM_FACE|CFM_BOLD,
            .szFaceName = _T("Microsoft Sans Serif"),
            .dwEffects = 0,
            .yHeight = 160
        };
        if (SendMessage(hLogWnd, EM_SETCHARFORMAT, SCF_DEFAULT, (LPARAM) &cfm) == 0)
            ShowLocalizedMsg(IDS_ERR_SET_SIZE);

        /* display version string as "OpenVPN GUI gui_version/core_version" */
        wchar_t version[256];
        _sntprintf_0(version, L"%S %S/%S", PACKAGE_NAME, PACKAGE_VERSION_RESOURCE_STR, o.ovpn_version)
        SetDlgItemText(hwndDlg, ID_TXT_VERSION, version);

        /* Set size and position of controls */
        RECT rect;
        GetWindowRect(hwndDlg, &rect);
        /* Move the window by upto 100 random pixels to avoid all
         * status windows fall on top of each other.
         */
        SetWindowPos(hwndDlg, HWND_TOP, rect.left + rand()%100,
                     rect.top + rand()%100, 0, 0, SWP_NOSIZE);
        GetClientRect(hwndDlg, &rect);
        RenderStatusWindow(hwndDlg, rect.right, rect.bottom);
        /* Set focus on the LogWindow so it scrolls automatically */
        SetFocus(hLogWnd);
        return FALSE;

    case WM_DPICHANGED:
        DpiSetScale(&o, HIWORD(wParam));
        RECT dlgRect;
        GetClientRect(hwndDlg, &dlgRect);
        RenderStatusWindow(hwndDlg, dlgRect.right, dlgRect.bottom);
        return FALSE;

    case WM_SIZE:
        RenderStatusWindow(hwndDlg, LOWORD(lParam), HIWORD(lParam));
        InvalidateRect(hwndDlg, NULL, TRUE);
        return TRUE;

    case WM_COMMAND:
        c = (connection_t *) GetProp(hwndDlg, cfgProp);
        switch (LOWORD(wParam))
        {
        case ID_DISCONNECT:
            SetFocus(GetDlgItem(c->hwndStatus, ID_EDT_LOG));
            StopOpenVPN(c);
            return TRUE;

        case ID_HIDE:
            if (c->state != disconnected)
                ShowWindow(hwndDlg, SW_HIDE);
            else
                DestroyWindow(hwndDlg);
            return TRUE;

        case ID_RESTART:
            c->state = reconnecting;
            SetFocus(GetDlgItem(c->hwndStatus, ID_EDT_LOG));
            RestartOpenVPN(c);
            return TRUE;
        }
        break;

    case WM_SHOWWINDOW:
        if (wParam == TRUE)
        {
            c = (connection_t *) GetProp(hwndDlg, cfgProp);
            if (c->hwndStatus)
                SetFocus(GetDlgItem(c->hwndStatus, ID_EDT_LOG));
        }
        return FALSE;

    case WM_CLOSE:
        c = (connection_t *) GetProp(hwndDlg, cfgProp);
        if (c->state != disconnected)
            ShowWindow(hwndDlg, SW_HIDE);
        else
            DestroyWindow(hwndDlg);
        return TRUE;

    case WM_NCDESTROY:
        RemoveProp(hwndDlg, cfgProp);
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    case WM_OVPN_STOP:
        c = (connection_t *) GetProp(hwndDlg, cfgProp);
        /* external messages can trigger when we are not ready -- check the state */
        if (!IsWindowEnabled(GetDlgItem(c->hwndStatus, ID_DISCONNECT)))
            break;
        c->state = disconnecting;
        RunDisconnectScript(c, false);
        EnableWindow(GetDlgItem(c->hwndStatus, ID_DISCONNECT), FALSE);
        EnableWindow(GetDlgItem(c->hwndStatus, ID_RESTART), FALSE);
        SetMenuStatus(c, disconnecting);
        SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(IDS_NFO_STATE_WAIT_TERM));
        SetEvent(c->exit_event);
        SetTimer(hwndDlg, IDT_STOP_TIMER, 15000, NULL);
        break;

    case WM_OVPN_SUSPEND:
        c = (connection_t *) GetProp(hwndDlg, cfgProp);
        c->state = suspending;
        EnableWindow(GetDlgItem(c->hwndStatus, ID_DISCONNECT), FALSE);
        EnableWindow(GetDlgItem(c->hwndStatus, ID_RESTART), FALSE);
        SetMenuStatus(c, disconnecting);
        SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(IDS_NFO_STATE_WAIT_TERM));
        SetEvent(c->exit_event);
        SetTimer(hwndDlg, IDT_STOP_TIMER, 15000, NULL);
        break;

    case WM_TIMER:
        PrintDebug(L"WM_TIMER message with wParam = %lu", wParam);
        c = (connection_t *) GetProp(hwndDlg, cfgProp);
        if (wParam == IDT_STOP_TIMER)
        {
            /* openvpn failed to respond to stop signal -- terminate */
            TerminateOpenVPN(c);
            KillTimer (hwndDlg, IDT_STOP_TIMER);
        }
        break;

    case WM_OVPN_RESTART:
        c = (connection_t *) GetProp(hwndDlg, cfgProp);
        /* external messages can trigger when we are not ready -- check the state */
        if (IsWindowEnabled(GetDlgItem(c->hwndStatus, ID_RESTART)))
            ManagementCommand(c, "signal SIGHUP", NULL, regular);
        if (!o.silent_connection)
        {
            SetForegroundWindow(c->hwndStatus);
            ShowWindow(c->hwndStatus, SW_SHOW);
        }
        break;
    }
    return FALSE;
}

/*
 * ThreadProc for OpenVPN status dialog windows
 */
static DWORD WINAPI
ThreadOpenVPNStatus(void *p)
{
    connection_t *c = p;
    TCHAR conn_name[200];
    MSG msg;
    HANDLE wait_event;

    CLEAR (msg);
    srand(time(NULL));

    /* Cut of extention from config filename. */
    _tcsncpy(conn_name, c->config_file, _countof(conn_name));
    conn_name[_tcslen(conn_name) - _tcslen(o.ext_string) - 1] = _T('\0');

    c->state = (c->state == suspended ? resuming : connecting);

    /* Create and Show Status Dialog */
    c->hwndStatus = CreateLocalizedDialogParam(ID_DLG_STATUS, StatusDialogFunc, (LPARAM) c);
    if (!c->hwndStatus)
        return 1;

    CheckAndSetTrayIcon();
    SetMenuStatus(c, connecting);
    SetDlgItemText(c->hwndStatus, ID_TXT_STATUS, LoadLocalizedString(IDS_NFO_STATE_CONNECTING));
    SetWindowText(c->hwndStatus, LoadLocalizedString(IDS_NFO_CONNECTION_XXX, conn_name));

    if (!OpenManagement(c))
        PostMessage(c->hwndStatus, WM_CLOSE, 0, 0);

    /* Start the async read loop for service and set it as the wait event */
    if (c->iserv.hEvent)
    {
        HandleServiceIO (0, 0, (LPOVERLAPPED) &c->iserv);
        wait_event = c->iserv.hEvent;
    }
    else
        wait_event = c->hProcess;

    if (o.silent_connection == 0)
        ShowWindow(c->hwndStatus, SW_SHOW);

    /* Load echo msg histroy from registry */
    echo_msg_load(c);

    /* Run the message loop for the status window */
    while (WM_QUIT != msg.message)
    {
        DWORD res;
        if (!PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            if ((res = MsgWaitForMultipleObjectsEx (1, &wait_event, INFINITE, QS_ALLINPUT,
                                         MWMO_ALERTABLE)) == WAIT_OBJECT_0)
            {
                if (wait_event == c->hProcess)
                    OnProcess (c, NULL);
                else if (wait_event == c->iserv.hEvent)
                    OnService (c, NULL);
            }
            continue;
        }

        if (IsDialogMessage(c->hwndStatus, &msg) == 0)
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    /* release handles etc.*/
    Cleanup (c);
    c->hwndStatus = NULL;
    return 0;
}

/*
 * Set priority based on the registry or cmd-line value
 */
static BOOL
SetProcessPriority(DWORD *priority)
{
    *priority = NORMAL_PRIORITY_CLASS;
    if (!_tcscmp(o.priority_string, _T("IDLE_PRIORITY_CLASS")))
        *priority = IDLE_PRIORITY_CLASS;
    else if (!_tcscmp(o.priority_string, _T("BELOW_NORMAL_PRIORITY_CLASS")))
        *priority = BELOW_NORMAL_PRIORITY_CLASS;
    else if (!_tcscmp(o.priority_string, _T("NORMAL_PRIORITY_CLASS")))
        *priority = NORMAL_PRIORITY_CLASS;
    else if (!_tcscmp(o.priority_string, _T("ABOVE_NORMAL_PRIORITY_CLASS")))
        *priority = ABOVE_NORMAL_PRIORITY_CLASS;
    else if (!_tcscmp(o.priority_string, _T("HIGH_PRIORITY_CLASS")))
        *priority = HIGH_PRIORITY_CLASS;
    else
    {
        ShowLocalizedMsg(IDS_ERR_UNKNOWN_PRIORITY, o.priority_string);
        return FALSE;
    }
    return TRUE;
}

/*
 * Launch an OpenVPN process and the accompanying thread to monitor it
 */
BOOL
StartOpenVPN(connection_t *c)
{
    TCHAR cmdline[1024];
    TCHAR *options = cmdline + 8;
    TCHAR exit_event_name[17];
    HANDLE hStdInRead = NULL, hStdInWrite = NULL;
    HANDLE hNul = NULL, hThread = NULL;
    DWORD written;
    BOOL retval = FALSE;

    CLEAR(c->ip);

    if (c->hwndStatus)
    {
        PrintDebug(L"Connection request when already started -- ignored");
        /* the tread can hang around after disconnect if user has not dismissed any popups */
        if (c->state == disconnected)
            WriteStatusLog(c, L"OpenVPN GUI> ",
                       L"Complete any pending dialog before starting a new connection", false);
        if (!o.silent_connection)
        {
           SetForegroundWindow(c->hwndStatus);
           ShowWindow(c->hwndStatus, SW_SHOW);
        }
        return FALSE;
    }
    PrintDebug(L"Starting openvpn on config %s", c->config_name);

    RunPreconnectScript(c);

    /* Create thread to show the connection's status dialog */
    hThread = CreateThread(NULL, 0, ThreadOpenVPNStatus, c, CREATE_SUSPENDED, &c->threadId);
    if (hThread == NULL)
    {
        ShowLocalizedMsg(IDS_ERR_CREATE_THREAD_STATUS);
        goto out;
    }

    /* Create an event object to signal OpenVPN to exit */
    _sntprintf_0(exit_event_name, _T("%x%08x"), GetCurrentProcessId(), c->threadId);
    c->exit_event = CreateEvent(NULL, TRUE, FALSE, exit_event_name);
    if (c->exit_event == NULL)
    {
        ShowLocalizedMsg(IDS_ERR_CREATE_EVENT, exit_event_name);
        goto out;
    }

    /* Create a management interface password */
    GetRandomPassword(c->manage.password, sizeof(c->manage.password) - 1);

    /* Construct command line -- put log first */
    _sntprintf_0(cmdline, _T("openvpn --log%s \"%s\" --config \"%s\" "
        "--setenv IV_GUI_VER \"%S\" --service %s 0 --auth-retry interact "
        "--management %S %hd stdin --management-query-passwords %s"
        "--management-hold"),
        (o.log_append ? _T("-append") : _T("")), c->log_path,
        c->config_file, PACKAGE_STRING, exit_event_name,
        inet_ntoa(c->manage.skaddr.sin_addr), ntohs(c->manage.skaddr.sin_port),
        (o.proxy_source != config ? _T("--management-query-proxy ") : _T("")));

    BOOL use_iservice = (o.iservice_admin && IsWindows7OrGreater()) || !IsUserAdmin();
    /* Try to open the service pipe */
    if (use_iservice && InitServiceIO(&c->iserv))
    {
        DWORD size = _tcslen(c->config_dir) + _tcslen(options) + sizeof(c->manage.password) + 3;
        TCHAR startup_info[1024];

        if ( !AuthorizeConfig(c))
        {
            CloseHandle(c->exit_event);
            CloseServiceIO(&c->iserv);
            goto out;
        }

        c->hProcess = NULL;
        c->manage.password[sizeof(c->manage.password) - 1] = '\n';

        /* Ignore pushed route-method when service is in use */
        const wchar_t *extra_options = L" --pull-filter ignore route-method";
        size += wcslen(extra_options);

        _sntprintf_0(startup_info, L"%s%c%s%s%c%.*S", c->config_dir, L'\0',
            options, extra_options, L'\0', sizeof(c->manage.password), c->manage.password);
        c->manage.password[sizeof(c->manage.password) - 1] = '\0';

        if (!WritePipe(c->iserv.pipe, startup_info, size * sizeof (TCHAR)))
        {
            ShowLocalizedMsg (IDS_ERR_WRITE_SERVICE_PIPE);
            CloseHandle(c->exit_event);
            CloseServiceIO(&c->iserv);
            goto out;
        }
    }
    else
    {
        /* Start OpenVPN directly */
        DWORD priority;
        STARTUPINFO si;
        PROCESS_INFORMATION pi;
        SECURITY_DESCRIPTOR sd;

        /* Make I/O handles inheritable and accessible by all */
        SECURITY_ATTRIBUTES sa = {
            .nLength = sizeof(sa),
            .lpSecurityDescriptor = &sd,
            .bInheritHandle = TRUE
        };

        if (!InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION))
        {
            ShowLocalizedMsg(IDS_ERR_INIT_SEC_DESC);
            CloseHandle(c->exit_event);
            return FALSE;
        }
        if (!SetSecurityDescriptorDacl(&sd, TRUE, NULL, FALSE))
        {
            ShowLocalizedMsg(IDS_ERR_SET_SEC_DESC_ACL);
            CloseHandle(c->exit_event);
            return FALSE;
        }

        /* Set process priority */
        if (!SetProcessPriority(&priority))
        {
            CloseHandle(c->exit_event);
            return FALSE;
        }

        /* Get a handle of the NUL device */
        hNul = CreateFile(_T("NUL"), GENERIC_WRITE, FILE_SHARE_WRITE, &sa, OPEN_EXISTING, 0, NULL);
        if (hNul == INVALID_HANDLE_VALUE)
        {
            CloseHandle(c->exit_event);
            return FALSE;
        }

        /* Create the pipe for STDIN with only the read end inheritable */
        if (!CreatePipe(&hStdInRead, &hStdInWrite, &sa, 0))
        {
            ShowLocalizedMsg(IDS_ERR_CREATE_PIPE_IN_READ);
            CloseHandle(c->exit_event);
            goto out;
        }
        if (!SetHandleInformation(hStdInWrite, HANDLE_FLAG_INHERIT, 0))
        {
            ShowLocalizedMsg(IDS_ERR_DUP_HANDLE_IN_WRITE);
            CloseHandle(c->exit_event);
            goto out;
        }

        /* Fill in STARTUPINFO struct */
        GetStartupInfo(&si);
        si.cb = sizeof(si);
        si.dwFlags = STARTF_USESTDHANDLES;
        si.hStdInput = hStdInRead;
        si.hStdOutput = hNul;
        si.hStdError = hNul;

        /* Create an OpenVPN process for the connection */
        if (!CreateProcess(o.exe_path, cmdline, NULL, NULL, TRUE,
                        priority | CREATE_NO_WINDOW, NULL, c->config_dir, &si, &pi))
        {
            ShowLocalizedMsg(IDS_ERR_CREATE_PROCESS, o.exe_path, cmdline, c->config_dir);
            CloseHandle(c->exit_event);
            goto out;
        }

        CloseHandleEx(&hStdInRead);
        CloseHandleEx(&hNul);

        /* Pass management password to OpenVPN process */
        c->manage.password[sizeof(c->manage.password) - 1] = '\n';
        WriteFile(hStdInWrite, c->manage.password, sizeof(c->manage.password), &written, NULL);
        c->manage.password[sizeof(c->manage.password) - 1] = '\0';

        c->hProcess = pi.hProcess; /* Will be closed in the event loop on exit */
        CloseHandle(pi.hThread);
    }

    /* Start the status dialog thread */
    ResumeThread(hThread);
    retval = TRUE;

out:
    if (hThread && hThread != INVALID_HANDLE_VALUE)
        CloseHandle(hThread);
    if (hStdInWrite && hStdInWrite != INVALID_HANDLE_VALUE)
        CloseHandle(hStdInWrite);
    if (hStdInRead && hStdInRead != INVALID_HANDLE_VALUE)
        CloseHandle(hStdInRead);
    if (hNul && hNul != INVALID_HANDLE_VALUE)
        CloseHandle(hNul);
    return retval;
}


void
StopOpenVPN(connection_t *c)
{
    PostMessage(c->hwndStatus, WM_OVPN_STOP, 0, 0);
}

/* force-kill as a last resort */
static BOOL
TerminateOpenVPN (connection_t *c)
{
    DWORD exit_code = 0;
    BOOL retval = TRUE;

    if (!c->hProcess)
        return retval;
    if (!GetExitCodeProcess (c->hProcess, &exit_code))
    {
        PrintDebug (L"In TerminateOpenVPN: failed to get process status: error = %lu", GetLastError());
        return FALSE;
    }
    if (exit_code == STILL_ACTIVE)
    {
        retval = TerminateProcess (c->hProcess, 1);
        if (retval)
            PrintDebug (L"Openvpn Process for config '%s' terminated", c->config_name);
        else
            PrintDebug (L"Failed to terminate openvpn Process for config '%s'", c->config_name);
    }
    else
        PrintDebug(L"In TerminateOpenVPN: Process is not active");

    return retval;
}

void
SuspendOpenVPN(int config)
{
    PostMessage(o.conn[config].hwndStatus, WM_OVPN_SUSPEND, 0, 0);
}

void
RestartOpenVPN(connection_t *c)
{
    if (c->hwndStatus)
        PostMessage(c->hwndStatus, WM_OVPN_RESTART, 0, 0);
    else /* Not started: treat this as a request to connect */
        StartOpenVPN(c);
}

void
SetStatusWinIcon(HWND hwndDlg, int iconId)
{
    HICON hIcon = LoadLocalizedSmallIcon(iconId);
    if (!hIcon)
        return;
    HICON hIconBig = LoadLocalizedIcon(ID_ICO_APP);
    if (!hIconBig)
        hIconBig = hIcon;
    SendMessage(hwndDlg, WM_SETICON, (WPARAM) ICON_SMALL, (LPARAM) hIcon);
    SendMessage(hwndDlg, WM_SETICON, (WPARAM) ICON_BIG, (LPARAM) hIconBig);
}


/*
 * Read one line from OpenVPN's stdout.
 */
static BOOL
ReadLineFromStdOut(HANDLE hStdOut, char *line, DWORD size)
{
    DWORD len, read;

    while (TRUE)
    {
        if (!PeekNamedPipe(hStdOut, line, size, &read, NULL, NULL))
        {
            if (GetLastError() != ERROR_BROKEN_PIPE)
                ShowLocalizedMsg(IDS_ERR_READ_STDOUT_PIPE);
            return FALSE;
        }

        char *pos = memchr(line, '\r', read);
        if (pos)
        {
            len = pos - line + 2;
            if (len > size)
                return FALSE;
            break;
        }

        /* Line doesn't fit into the buffer */
        if (read == size)
            return FALSE;

        Sleep(100);
    }

    if (!ReadFile(hStdOut, line, len, &read, NULL) || read != len)
    {
        if (GetLastError() != ERROR_BROKEN_PIPE)
            ShowLocalizedMsg(IDS_ERR_READ_STDOUT_PIPE);
        return FALSE;
    }

    line[read - 2] = '\0';
    return TRUE;
}


BOOL
CheckVersion()
{
    HANDLE hStdOutRead = NULL;
    HANDLE hStdOutWrite = NULL;
    BOOL retval = FALSE;
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    TCHAR cmdline[] = _T("openvpn --version");
    char match_version[] = "OpenVPN 2.";
    TCHAR pwd[MAX_PATH];
    char line[1024];
    TCHAR *p;

    CLEAR(si);
    CLEAR(pi);

    /* Make handles inheritable and accessible by all */
    SECURITY_DESCRIPTOR sd;
    SECURITY_ATTRIBUTES sa = {
        .nLength = sizeof(sa),
        .lpSecurityDescriptor = &sd,
        .bInheritHandle = TRUE
    };
    if (!InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION))
    {
        ShowLocalizedMsg(IDS_ERR_INIT_SEC_DESC);
        return FALSE;
    }
    if (!SetSecurityDescriptorDacl(&sd, TRUE, NULL, FALSE))
    {
        ShowLocalizedMsg(IDS_ERR_SET_SEC_DESC_ACL);
        return FALSE;
    }

    /* Create the pipe for STDOUT with inheritable write end */
    if (!CreatePipe(&hStdOutRead, &hStdOutWrite, &sa, 0))
    {
        ShowLocalizedMsg(IDS_ERR_CREATE_PIPE_IN_READ);
        return FALSE;
    }
    if (!SetHandleInformation(hStdOutRead, HANDLE_FLAG_INHERIT, 0))
    {
        ShowLocalizedMsg(IDS_ERR_DUP_HANDLE_IN_WRITE);
        goto out;
    }

    /* Construct the process' working directory */
    _tcsncpy(pwd, o.exe_path, _countof(pwd));
    p = _tcsrchr(pwd, _T('\\'));
    if (p != NULL)
        *p = _T('\0');

    /* Fill in STARTUPINFO struct */
    si.cb = sizeof(si);
    si.dwFlags = STARTF_USESTDHANDLES;
    si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
    si.hStdOutput = hStdOutWrite;
    si.hStdError = hStdOutWrite;

    /* Start OpenVPN to check version */
    bool success = CreateProcess(o.exe_path, cmdline, NULL, NULL, TRUE,
                       CREATE_NO_WINDOW, NULL, pwd, &si, &pi);
    if (!success)
    {
        ShowLocalizedMsg(IDS_ERR_CREATE_PROCESS, o.exe_path, cmdline, pwd);
        goto out;
    }

    CloseHandleEx(&hStdOutWrite);
    CloseHandleEx(&pi.hThread);
    CloseHandleEx(&pi.hProcess);

    if (ReadLineFromStdOut(hStdOutRead, line, sizeof(line)))
    {
#ifdef DEBUG
        PrintDebug(_T("VersionString: %S"), line);
#endif
        /* OpenVPN version 2.x */
        char *p = strstr(line, match_version);
        if (p)
        {
            retval = TRUE;
            p = strtok(p+8, " ");
            strncpy(o.ovpn_version, p, _countof(o.ovpn_version)-1);
            o.ovpn_version[_countof(o.ovpn_version)-1] = '\0';
        }
    }

out:
    CloseHandleEx(&hStdOutWrite);
    CloseHandleEx(&hStdOutRead);
    return retval;
}

/* Delete saved passwords and reset the checkboxes to default */
void
ResetSavePasswords(connection_t *c)
{
    if (ShowLocalizedMsgEx(MB_OKCANCEL, TEXT(PACKAGE_NAME), IDS_NFO_DELETE_PASS, c->config_name) == IDCANCEL)
        return;
    DeleteSavedPasswords(c->config_name);
    c->flags &= ~(FLAG_SAVE_KEY_PASS | FLAG_SAVE_AUTH_PASS);
    SetMenuStatus(c, c->state);
}