xtrn.cpp 42.4 KB
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/* xtrn.cpp */

/* Synchronet external program support routines */

/* $Id$ */

/****************************************************************************
 * @format.tab-size 4		(Plain Text/Source Code File Header)			*
 * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
 *																			*
 * Copyright 2000 Rob Swindell - http://www.synchro.net/copyright.html		*
 *																			*
 * 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.					*
 * See the GNU General Public License for more details: gpl.txt or			*
 * http://www.fsf.org/copyleft/gpl.html										*
 *																			*
 * Anonymous FTP access to the most recent released source is available at	*
 * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net	*
 *																			*
 * Anonymous CVS access to the development source and modification history	*
 * is available at cvs.synchro.net:/cvsroot/sbbs, example:					*
 * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login			*
 *     (just hit return, no password is necessary)							*
 * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src		*
 *																			*
 * For Synchronet coding style and modification guidelines, see				*
 * http://www.synchro.net/source.html										*
 *																			*
 * You are encouraged to submit any modifications (preferably in Unix diff	*
 * format) via e-mail to mods@synchro.net									*
 *																			*
 * Note: If this box doesn't appear square, then you need to fix your tabs.	*
 ****************************************************************************/

#include "sbbs.h"
#include "cmdshell.h"
#include "telnet.h"

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#include <signal.h>			// kill()

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#ifdef __unix__
	#include <sys/wait.h>	// WEXITSTATUS

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#if defined(__FreeBSD__)
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	#include <libutil.h>	// forkpty()
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#elif defined(__OpenBSD__)
	#include <util.h>
#elif defined(__linux__)
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	#include <pty.h>
#endif
	#include <termios.h>
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	static void setup_term(int fd, char* term);	
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#endif
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#define XTRN_IO_BUF_LEN 5000

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/*****************************************************************************/
/* Interrupt routine to expand WWIV Ctrl-C# codes into ANSI escape sequences */
/*****************************************************************************/
BYTE* wwiv_expand(BYTE* buf, ulong buflen, BYTE* outbuf, ulong& newlen
	,ulong user_misc, bool& ctrl_c)
{
    char	ansi_seq[32];
	ulong 	i,j,k;

    for(i=j=0;i<buflen;i++) {
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        if(buf[i]==CTRL_C) {	/* WWIV color escape char */
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            ctrl_c=true;
            continue;
        }
        if(!ctrl_c) {
            outbuf[j++]=buf[i];
            continue;
        }
        ctrl_c=false;
        if(user_misc&ANSI) {
            switch(buf[i]) {
                default:
                    strcpy(ansi_seq,"\x1b[0m");          /* low grey */
                    break;
                case '1':
                    strcpy(ansi_seq,"\x1b[0;1;36m");     /* high cyan */
                    break;
                case '2':
                    strcpy(ansi_seq,"\x1b[0;1;33m");     /* high yellow */
                    break;
                case '3':
                    strcpy(ansi_seq,"\x1b[0;35m");       /* low magenta */
                    break;
                case '4':
                    strcpy(ansi_seq,"\x1b[0;1;44m");     /* white on blue */
                    break;
                case '5':
                    strcpy(ansi_seq,"\x1b[0;32m");       /* low green */
                    break;
                case '6':
                    strcpy(ansi_seq,"\x1b[0;1;5;31m");   /* high blinking red */
                    break;
                case '7':
                    strcpy(ansi_seq,"\x1b[0;1;34m");     /* high blue */
                    break;
                case '8':
                    strcpy(ansi_seq,"\x1b[0;34m");       /* low blue */
                    break;
                case '9':
                    strcpy(ansi_seq,"\x1b[0;36m");       /* low cyan */
                    break;
            }
            for(k=0;ansi_seq[k];k++)
                outbuf[j++]=ansi_seq[k];
        }
    }
    newlen=j;
    return(outbuf);
}
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/*****************************************************************************/
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// Escapes Telnet IAC (255) by doubling the IAC char
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/*****************************************************************************/
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BYTE* telnet_expand(BYTE* inbuf, ulong inlen, BYTE* outbuf, ulong& newlen)
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{
	BYTE*   first_iac;
	ulong	i,outlen;

    first_iac=(BYTE*)memchr(inbuf, TELNET_IAC, inlen);

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	if(first_iac==NULL) {	/* Nothing to expand */
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		newlen=inlen;
		return(inbuf);
	}

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	outlen=first_iac-inbuf;
	memcpy(outbuf, inbuf, outlen);
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    for(i=outlen;i<inlen;i++) {
		if(inbuf[i]==TELNET_IAC)
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			outbuf[outlen++]=TELNET_IAC;
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		outbuf[outlen++]=inbuf[i];
	}
    newlen=outlen;
    return(outbuf);
}
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#define XTRN_LOADABLE_MODULE								\
	if(cmdline[0]=='*') {   /* Baja module or JavaScript */	\
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		SAFECOPY(str,cmdline+1);							\
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		p=strchr(str,SP);									\
		if(p) {												\
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			strcpy(main_csi.str,p+1);						\
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			*p=0; 											\
		} else												\
			main_csi.str[0]=0;								\
		if(!strchr(str,'.'))								\
			strcat(str,".bin");								\
		return(exec_bin(str,&main_csi));					\
	}														
#ifdef JAVASCRIPT
	#define XTRN_LOADABLE_JS_MODULE							\
	if(cmdline[0]=='?') 	/* JavaScript */				\
		return(js_execfile(cmdline+1))						
#else
	#define XTRN_LOADABLE_JS_MODULE
#endif
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#ifdef _WIN32

#include "execvxd.h"	/* Win9X FOSSIL VxD API */

extern SOCKET node_socket[];

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// -------------------------------------------------------------------------
// GetAddressOfOpenVxDHandle
//
// This function returns the address of OpenVxDHandle. OpenVxDHandle is a 
// KERNEL32 function that returns a ring 0 event handle that corresponds to a
// given ring 3 event handle. The ring 0 handle can be used by VxDs to
// synchronize with the Win32 app.
//
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typedef HANDLE (WINAPI *OPENVXDHANDLE)(HANDLE);

OPENVXDHANDLE GetAddressOfOpenVxDHandle(void)
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{
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	return((OPENVXDHANDLE)GetProcAddress(hK32, "OpenVxDHandle"));
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}

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/*****************************************************************************/
// Expands Single CR to CRLF
/*****************************************************************************/
BYTE* cr_expand(BYTE* inbuf, ulong inlen, BYTE* outbuf, ulong& newlen)
{
	ulong	i,j;

	for(i=j=0;i<inlen;i++) {
		outbuf[j++]=inbuf[i];
		if(inbuf[i]=='\r')
			outbuf[j++]='\n';
	}
	newlen=j;
    return(outbuf);
}

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/* Clean-up resources while preserving current LastError value */
#define XTRN_CLEANUP												\
	last_error=GetLastError();										\
    if(vxd!=INVALID_HANDLE_VALUE)		CloseHandle(vxd);			\
	if(rdslot!=INVALID_HANDLE_VALUE)	CloseHandle(rdslot);		\
	if(wrslot!=INVALID_HANDLE_VALUE)	CloseHandle(wrslot);		\
	if(start_event!=NULL)				CloseHandle(start_event);	\
	if(hungup_event!=NULL)				CloseHandle(hungup_event);	\
	ReleaseMutex(exec_mutex);										\
	SetLastError(last_error)

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/****************************************************************************/
/* Runs an external program 												*/
/****************************************************************************/
int sbbs_t::external(char* cmdline, long mode, char* startup_dir)
{
	char	str[256],*p,*p_startup_dir;
	char	fname[128];
    char	fullcmdline[256];
	char	realcmdline[256];
	char	comspec_str[128];
	char	title[256];
	BYTE	buf[XTRN_IO_BUF_LEN],*bp;
    BYTE 	telnet_buf[XTRN_IO_BUF_LEN*2];
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    BYTE 	output_buf[XTRN_IO_BUF_LEN*2];
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    BYTE 	wwiv_buf[XTRN_IO_BUF_LEN*2];
    bool	wwiv_flag=false;
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    bool	native=false;			// DOS program by default
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	bool	nt=false;				// WinNT/2K? 
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    bool	was_online=true;
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	bool	rio_abortable_save;
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	bool	use_pipes=false;	// NT-compatible console redirection
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	uint	i;
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    time_t	hungup=0;
	HANDLE	vxd=INVALID_HANDLE_VALUE;
	HANDLE	rdslot=INVALID_HANDLE_VALUE;
	HANDLE	wrslot=INVALID_HANDLE_VALUE;
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	HANDLE  start_event=NULL;
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	HANDLE	hungup_event=NULL;
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	HANDLE	rdoutpipe;
	HANDLE	wrinpipe;
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    PROCESS_INFORMATION process_info;
	DWORD	hVM;
	DWORD	rd;
    DWORD	wr;
    DWORD	len;
    DWORD	avail;
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	DWORD	dummy;
	DWORD	msglen;
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	DWORD	retval;
	DWORD	last_error;
	DWORD	loop_since_io=0;
	struct	tm * tm_p;
	sbbsexec_start_t start;
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	OPENVXDHANDLE OpenVxDHandle;
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	if(online==ON_LOCAL)
		eprintf("Executing external: %s",cmdline);

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	XTRN_LOADABLE_MODULE;
	XTRN_LOADABLE_JS_MODULE;
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	attr(cfg.color[clr_external]);        /* setup default attributes */

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    SAFECOPY(str,cmdline);		/* Set str to program name only */
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    p=strchr(str,SP);
    if(p) *p=0;
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    SAFECOPY(fname,str);
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    p=strrchr(fname,'/');
    if(!p) p=strrchr(fname,'\\');
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    if(!p) p=strchr(fname,':');
    if(!p) p=fname;
    else   p++;

    for(i=0;i<cfg.total_natvpgms;i++)
        if(!stricmp(p,cfg.natvpgm[i]->name))
            break;
    if(i<cfg.total_natvpgms || mode&EX_NATIVE)
        native=true;

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	if(mode&EX_SH || strcspn(cmdline,"<>|")!=strlen(cmdline)) 
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		sprintf(comspec_str,"%s /C ", comspec);
	else
		comspec_str[0]=0;

    if(startup_dir && cmdline[1]!=':' && cmdline[0]!='/'
    	&& cmdline[0]!='\\' && cmdline[0]!='.')
       	sprintf(fullcmdline, "%s%s%s", comspec_str, startup_dir, cmdline);
    else
    	sprintf(fullcmdline, "%s%s", comspec_str, cmdline);

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	SAFECOPY(realcmdline, fullcmdline);	// for errormsg if failed to execute
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	now=time(NULL);
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	tm_p=localtime(&now);
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	OpenVxDHandle=GetAddressOfOpenVxDHandle();

	if(OpenVxDHandle==NULL) 
		nt=true;	// Windows NT/2000

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	if(!nt && !native && !(cfg.xtrn_misc&XTRN_NO_MUTEX)
		&& (retval=WaitForSingleObject(exec_mutex,5000))!=WAIT_OBJECT_0) {
		errormsg(WHERE, ERR_TIMEOUT, "exec_mutex", retval);
		return(GetLastError());
	}

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	if(native && mode&EX_OUTR && !(mode&EX_OFFLINE))
		use_pipes=true;

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 	if(native) { // Native (32-bit) external
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		// Current environment passed to child process
		sprintf(dszlog,"DSZLOG=%sPROTOCOL.LOG",cfg.node_dir);
		sprintf(sbbsnode,"SBBSNODE=%s",cfg.node_dir);
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		sprintf(sbbsctrl,"SBBSCTRL=%s",cfg.ctrl_dir);
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		sprintf(sbbsdata,"SBBSDATA=%s",cfg.data_dir);
		sprintf(sbbsexec,"SBBSEXEC=%s",cfg.exec_dir);
		sprintf(sbbsnnum,"SBBSNNUM=%d",cfg.node_num);
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		putenv(dszlog); 		/* Makes the DSZ LOG active */
		putenv(sbbsnode);
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		putenv(sbbsctrl);
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		putenv(sbbsdata);
		putenv(sbbsexec);
		putenv(sbbsnnum);
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		if(tm_p!=NULL) {		/* date/time env vars */
			sprintf(env_day			,"DAY=%02u"			,tm_p->tm_mday);
			sprintf(env_weekday		,"WEEKDAY=%s"		,wday[tm_p->tm_wday]);
			sprintf(env_monthname	,"MONTHNAME=%s"		,mon[tm_p->tm_mon]);
			sprintf(env_month		,"MONTH=%02u"		,tm_p->tm_mon+1);
			sprintf(env_year		,"YEAR=%u"			,1900+tm_p->tm_year);
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			putenv(env_day);
			putenv(env_weekday);
			putenv(env_monthname);
			putenv(env_month);
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			if(putenv(env_year))
        		errormsg(WHERE,ERR_WRITE,"environment",0);
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		}
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    } else { // DOS external

		sprintf(str,"%sDOSXTRN.RET", cfg.node_dir);
		remove(str);

    	// Create temporary environment file
    	sprintf(str,"%sDOSXTRN.ENV", cfg.node_dir);
        FILE* fp=fopen(str,"w");
        if(fp==NULL) {
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			XTRN_CLEANUP;
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        	errormsg(WHERE, ERR_CREATE, str, 0);
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            return(errno);
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        }
        fprintf(fp, "%s\n", fullcmdline);
		fprintf(fp, "DSZLOG=%sPROTOCOL.LOG\n", cfg.node_dir);
        fprintf(fp, "SBBSNODE=%s\n", cfg.node_dir);
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        fprintf(fp, "SBBSCTRL=%s\n", cfg.ctrl_dir);
		fprintf(fp, "SBBSDATA=%s\n", cfg.data_dir);
		fprintf(fp, "SBBSEXEC=%s\n", cfg.exec_dir);
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        fprintf(fp, "SBBSNNUM=%d\n", cfg.node_num);
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		if(tm_p!=NULL) {	/* date/time env vars */
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			fprintf(fp, "DAY=%02u\n", tm_p->tm_mday);
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			fprintf(fp, "WEEKDAY=%s\n",wday[tm_p->tm_wday]);
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			fprintf(fp, "MONTHNAME=%s\n",mon[tm_p->tm_mon]);
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			fprintf(fp, "MONTH=%02u\n",tm_p->tm_mon+1);
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			fprintf(fp, "YEAR=%u\n",1900+tm_p->tm_year);
		}
        fclose(fp);

        sprintf(fullcmdline, "%sDOSXTRN.EXE %s", cfg.exec_dir, str);

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		if(!(mode&EX_OFFLINE) && nt) {	// Windows NT/2000
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			i=SBBSEXEC_MODE_FOSSIL;
			if(mode&EX_INR)
           		i|=SBBSEXEC_MODE_DOS_IN;
			if(mode&EX_OUTR)
        		i|=SBBSEXEC_MODE_DOS_OUT;
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			sprintf(str," NT %u %u %u"
				,cfg.node_num,i,startup->xtrn_polls_before_yield);
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			strcat(fullcmdline,str);

			sprintf(str,"sbbsexec_hungup%d",cfg.node_num);
			if((hungup_event=CreateEvent(
				 NULL	// pointer to security attributes
				,TRUE	// flag for manual-reset event
				,FALSE  // flag for initial state
				,str	// pointer to event-object name
				))==NULL) {
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				XTRN_CLEANUP;
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				errormsg(WHERE, ERR_CREATE, "exec start event", 0);
				return(GetLastError());
			}

			sprintf(str,"\\\\.\\mailslot\\sbbsexec\\rd%d"
				,cfg.node_num);
			rdslot=CreateMailslot(str
				,sizeof(buf)			// Maximum message size (0=unlimited)
				,0						// Read time-out
				,NULL);                 // Security
			if(rdslot==INVALID_HANDLE_VALUE) {
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				XTRN_CLEANUP;
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				errormsg(WHERE, ERR_CREATE, str, 0);
				return(GetLastError());
			}
		}
		else if(!(mode&EX_OFFLINE)) {

   			// Load vxd to intercept interrupts

			sprintf(str,"\\\\.\\%s%s",cfg.exec_dir, SBBSEXEC_VXD);
			if((vxd=CreateFile(str,0,0,0
				,CREATE_NEW, FILE_FLAG_DELETE_ON_CLOSE,0))
				 ==INVALID_HANDLE_VALUE) {
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				XTRN_CLEANUP;
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				errormsg(WHERE, ERR_OPEN, str, 0);
				return(GetLastError());
			}

			if((start_event=CreateEvent(
				 NULL	// pointer to security attributes
				,TRUE	// flag for manual-reset event
				,FALSE  // flag for initial state
				,NULL	// pointer to event-object name
				))==NULL) {
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				XTRN_CLEANUP;
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				errormsg(WHERE, ERR_CREATE, "exec start event", 0);
				return(GetLastError());
			}

			if(OpenVxDHandle!=NULL)
				start.event=OpenVxDHandle(start_event);
			else
				start.event=start_event;

			start.mode=SBBSEXEC_MODE_FOSSIL;
			if(mode&EX_INR)
           		start.mode|=SBBSEXEC_MODE_DOS_IN;
			if(mode&EX_OUTR)
        		start.mode|=SBBSEXEC_MODE_DOS_OUT;

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			sprintf(str," 95 %u %u %u"
				,cfg.node_num,start.mode,startup->xtrn_polls_before_yield);
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			strcat(fullcmdline,str);

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			if(!DeviceIoControl(
				vxd,					// handle to device of interest
				SBBSEXEC_IOCTL_START,	// control code of operation to perform
				&start,					// pointer to buffer to supply input data
				sizeof(start),			// size of input buffer
				NULL,					// pointer to buffer to receive output data
				0,						// size of output buffer
				&rd,					// pointer to variable to receive output byte count
				NULL 					// Overlapped I/O
				)) {
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				XTRN_CLEANUP;
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				errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_START);
				return(GetLastError());
			}
		}
    }

	if(startup_dir!=NULL && startup_dir[0])
		p_startup_dir=startup_dir;
	else
		p_startup_dir=NULL;
    STARTUPINFO startup_info={0};
    startup_info.cb=sizeof(startup_info);
	if(mode&EX_OFFLINE)
		startup_info.lpTitle=NULL;
	else {
		sprintf(title,"%s running %s on node %d"
			,useron.number ? useron.alias : "Event"
			,realcmdline
			,cfg.node_num);
		startup_info.lpTitle=title;
	}
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    if(startup->options&BBS_OPT_XTRN_MINIMIZED) {
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    	startup_info.wShowWindow=SW_SHOWMINNOACTIVE;
        startup_info.dwFlags|=STARTF_USESHOWWINDOW;
    }
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	if(use_pipes) {
		// Set up the security attributes struct.
		SECURITY_ATTRIBUTES sa;
		memset(&sa,0,sizeof(sa));
		sa.nLength= sizeof(SECURITY_ATTRIBUTES);
		sa.lpSecurityDescriptor = NULL;
		sa.bInheritHandle = TRUE;

		// Create the child output pipe.
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		if(!CreatePipe(&rdoutpipe,&startup_info.hStdOutput,&sa,0)) {
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			errormsg(WHERE,ERR_CREATE,"stdout pipe",0);
			return(GetLastError());
		}
		startup_info.hStdError=startup_info.hStdOutput;

		// Create the child input pipe.
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		if(!CreatePipe(&startup_info.hStdInput,&wrinpipe,&sa,0)) {
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			errormsg(WHERE,ERR_CREATE,"stdin pipe",0);
			return(GetLastError());
		}
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		DuplicateHandle(
			GetCurrentProcess(), rdoutpipe,
			GetCurrentProcess(), &rdslot, 0, FALSE, DUPLICATE_SAME_ACCESS);

		DuplicateHandle(
			GetCurrentProcess(), wrinpipe,
			GetCurrentProcess(), &wrslot, 0, FALSE, DUPLICATE_SAME_ACCESS);

		CloseHandle(rdoutpipe);
		CloseHandle(wrinpipe);

		startup_info.dwFlags|=STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;
    	startup_info.wShowWindow=SW_HIDE;
	}
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	if(native && !(mode&EX_OFFLINE)) {
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		/* temporary */
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		FILE* fp;
		sprintf(fname,"%sDOOR32.SYS",cfg.node_dir);
		fp=fopen(fname,"wb");
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		fprintf(fp,"%d\r\n%d\r\n38400\r\n%s%c\r\n%d\r\n%s\r\n%s\r\n%d\r\n%d\r\n"
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			"%d\r\n%d\r\n"
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			,mode&EX_OUTR ? 0 /* Local */ : 2 /* Telnet */
			,mode&EX_OUTR ? INVALID_SOCKET : client_socket_dup
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			,VERSION_NOTICE,REVISION
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			,useron.number
			,useron.name
			,useron.alias
			,useron.level
			,timeleft/60
			,useron.misc&ANSI ? 1 : 0
			,cfg.node_num);
		fclose(fp);
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		/* not temporary */
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		if(!(mode&EX_INR)) 
			pthread_mutex_lock(&input_thread_mutex);
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	}

    if(!CreateProcess(
		NULL,			// pointer to name of executable module
		fullcmdline,  	// pointer to command line string
		NULL,  			// process security attributes
		NULL,   		// thread security attributes
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		native && !(mode&EX_OFFLINE),	 			// handle inheritance flag
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		CREATE_NEW_CONSOLE/*|CREATE_SEPARATE_WOW_VDM*/, // creation flags
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        NULL,  			// pointer to new environment block
		p_startup_dir,	// pointer to current directory name
		&startup_info,  // pointer to STARTUPINFO
		&process_info  	// pointer to PROCESS_INFORMATION
		)) {
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		XTRN_CLEANUP;
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		if(native && !(mode&EX_OFFLINE))
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			pthread_mutex_unlock(&input_thread_mutex);
		SetLastError(last_error);	/* Restore LastError */
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        errormsg(WHERE, ERR_EXEC, realcmdline, mode);
        return(GetLastError());
    }

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#if 0
	char dbgstr[256];
	sprintf(dbgstr,"Node %d created: hProcess %X hThread %X processID %X threadID %X\n"
		,cfg.node_num
		,process_info.hProcess 
		,process_info.hThread 
		,process_info.dwProcessId 
		,process_info.dwThreadId); 
	OutputDebugString(dbgstr);
#endif

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	CloseHandle(process_info.hThread);

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	if(!native) {

		if(!(mode&EX_OFFLINE) && !nt) {
    		// Wait for notification from VXD that new VM has started
			if((retval=WaitForSingleObject(start_event, 5000))!=WAIT_OBJECT_0) {
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                TerminateProcess(process_info.hProcess, __LINE__);
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				CloseHandle(process_info.hProcess);
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				errormsg(WHERE, ERR_TIMEOUT, "start_event", retval);
				return(GetLastError());
			}

			CloseHandle(start_event);
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			start_event=NULL;	/* Mark as closed */
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			if(!DeviceIoControl(
				vxd,					// handle to device of interest
				SBBSEXEC_IOCTL_COMPLETE,	// control code of operation to perform
				NULL,					// pointer to buffer to supply input data
				0,						// size of input buffer
				&hVM,					// pointer to buffer to receive output data
				sizeof(hVM),			// size of output buffer
				&rd,					// pointer to variable to receive output byte count
				NULL					// Overlapped I/O
				)) {
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				XTRN_CLEANUP;
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                TerminateProcess(process_info.hProcess, __LINE__);
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				CloseHandle(process_info.hProcess);
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				errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_COMPLETE);
				return(GetLastError());
			}
		}
	}
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    ReleaseMutex(exec_mutex);
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	/* Disable Ctrl-C checking */
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	if(!(mode&EX_OFFLINE)) {
		rio_abortable_save=rio_abortable;
		rio_abortable=false;
	}
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    // Executing app in foreground?, monitor
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    retval=STILL_ACTIVE;
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    while(!(mode&EX_BG)) {
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		if(mode&EX_CHKTIME)
			gettimeleft();
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        if(!online && !(mode&EX_OFFLINE)) { // Tell VXD/VDD and external that user hung-up
        	if(was_online) {
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				sprintf(str,"%s hung-up in external program",useron.alias);
				logline("X!",str);
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            	hungup=time(NULL);
				if(!native) {
					if(nt)
						SetEvent(hungup_event);
					else if(!DeviceIoControl(
						vxd,		// handle to device of interest
						SBBSEXEC_IOCTL_DISCONNECT,	// operation to perform
						&hVM,		// pointer to buffer to supply input data
						sizeof(hVM),// size of input buffer
						NULL,		// pointer to buffer to receive output data
						0,			// size of output buffer
						&rd,		// pointer to variable to receive output byte count
						NULL		// Overlapped I/O
						)) {
						errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_DISCONNECT);
						break;
					}
				}
	            was_online=false;
            }
            if(hungup && time(NULL)-hungup>5) 
                TerminateProcess(process_info.hProcess, 2112);
        }
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		if((native && !use_pipes) || mode&EX_OFFLINE) {	
			/* Monitor for process termination only */
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            if(GetExitCodeProcess(process_info.hProcess, &retval)==FALSE) {
                errormsg(WHERE, ERR_CHK, "ExitCodeProcess"
                   ,(DWORD)process_info.hProcess);
                break;
            }
            if(retval!=STILL_ACTIVE)
                break;
        	Sleep(500);
		} else {

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			if(nt || use_pipes) {	// Windows NT/2000
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				/* Write to VDD */

				wr=RingBufPeek(&inbuf,buf,sizeof(buf));
				if(wr) {
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					if(!use_pipes && wrslot==INVALID_HANDLE_VALUE) {
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						sprintf(str,"\\\\.\\mailslot\\sbbsexec\\wr%d"
							,cfg.node_num);
						wrslot=CreateFile(str
							,GENERIC_WRITE
							,FILE_SHARE_READ
							,NULL
							,OPEN_EXISTING
							,FILE_ATTRIBUTE_NORMAL
							,(HANDLE) NULL);
#if 0
						if(wrslot==INVALID_HANDLE_VALUE) {
							errormsg(WHERE,ERR_OPEN,str,0);
							break;
						}
#endif
					}
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					/* CR expansion */
					if(use_pipes) 
						bp=cr_expand(buf,wr,output_buf,wr);
					else
						bp=buf;
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					if(wrslot!=INVALID_HANDLE_VALUE
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						&& WriteFile(wrslot,bp,wr,&len,NULL)==TRUE) {
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						RingBufRead(&inbuf, NULL, len);
						wr=len;
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						if(use_pipes) {
							/* echo */
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							RingBufWrite(&outbuf, bp, wr);
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							sem_post(&output_sem);
						}
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					} else		// VDD not loaded yet
						wr=0;
				}

				/* Read from VDD */

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				rd=0;
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				len=sizeof(buf);
				avail=RingBufFree(&outbuf);
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				if(avail==0)
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					lprintf("Node %d !output buffer full (%u bytes)"
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						,cfg.node_num,RingBufFull(&outbuf));
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				if(len>avail)
            		len=avail;
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				while(rd<len && avail>RingBufFull(&outbuf)) {
					DWORD waiting=0;

					if(use_pipes)
						PeekNamedPipe(
							rdslot,             // handle to pipe to copy from
							NULL,               // pointer to data buffer
							0,					// size, in bytes, of data buffer
							NULL,				// pointer to number of bytes read
							&waiting,			// pointer to total number of bytes available
							NULL				// pointer to unread bytes in this message
							);
					else
						GetMailslotInfo(
							rdslot,				// mailslot handle 
 							NULL,				// address of maximum message size 
							NULL,				// address of size of next message 
							&waiting,			// address of number of messages 
 							NULL				// address of read time-out 
							);
					if(!waiting)
						break;
					if(ReadFile(rdslot,buf+rd,len-rd,&msglen,NULL)==FALSE || msglen<1)
						break;
					rd+=msglen;
				}

				if(rd) {
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					if(mode&EX_WWIV) {
                		bp=wwiv_expand(buf, rd, wwiv_buf, rd, useron.misc, wwiv_flag);
						if(rd>sizeof(wwiv_buf))
							errorlog("WWIV_BUF OVERRUN");
					} else {
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                		bp=telnet_expand(buf, rd, telnet_buf, rd);
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						if(rd>sizeof(telnet_buf))
							errorlog("TELNET_BUF OVERRUN");
					}
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					if(rd>avail) {
						errorlog("RINGBUFFER OVERRUN");
						rd=avail;
					}
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					RingBufWrite(&outbuf, bp, rd);
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					sem_post(&output_sem);
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				}
			} else {	// Windows 9x

				/* Write to VXD */

				wr=RingBufPeek(&inbuf, buf+sizeof(hVM),sizeof(buf)-sizeof(hVM));
				if(wr) {
					*(DWORD*)buf=hVM;
					wr+=sizeof(hVM);
					if(!DeviceIoControl(
						vxd,					// handle to device of interest
						SBBSEXEC_IOCTL_WRITE,	// control code of operation to perform
						buf,					// pointer to buffer to supply input data
						wr,						// size of input buffer
						&rd,					// pointer to buffer to receive output data
						sizeof(rd),				// size of output buffer
						&dummy,	 				// pointer to variable to receive output byte count
						NULL					// Overlapped I/O
						)) {
						errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_READ);
						break;
					}
					RingBufRead(&inbuf, NULL, rd);
					wr=rd;
				}
        		/* Read from VXD */
				rd=0;
				len=sizeof(buf);
				avail=RingBufFree(&outbuf);
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				if(avail==0) 
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					lprintf("Node %d !output buffer full (%u bytes)"
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						,cfg.node_num,RingBufFull(&outbuf));

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				if(len>avail)
            		len=avail;
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				if(avail>=RingBufFull(&outbuf)) {
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					if(!DeviceIoControl(
						vxd,					// handle to device of interest
						SBBSEXEC_IOCTL_READ,	// control code of operation to perform
						&hVM,					// pointer to buffer to supply input data
						sizeof(hVM),			// size of input buffer
						buf,					// pointer to buffer to receive output data
						len,					// size of output buffer
						&rd,					// pointer to variable to receive output byte count
						NULL					// Overlapped I/O
						)) {
						errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_READ);
						break;
					}
#if 0
					if(rd>1)
                		lprintf("read %d bytes from xtrn", rd);
#endif

					if(mode&EX_WWIV)
                		bp=wwiv_expand(buf, rd, wwiv_buf, rd, useron.misc, wwiv_flag);
					else
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                		bp=telnet_expand(buf, rd, telnet_buf, rd);
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					RingBufWrite(&outbuf, bp, rd);
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					sem_post(&output_sem);
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				}
			}
            if(!rd && !wr) {
				if(++loop_since_io>=1000) {
	                if(GetExitCodeProcess(process_info.hProcess, &retval)==FALSE) {
	                    errormsg(WHERE, ERR_CHK, "ExitCodeProcess"
						,(DWORD)process_info.hProcess);
						break;
					}
					if(retval!=STILL_ACTIVE)  {
#if 0
						if(hungup)
							Sleep(5000);	// Give the application time to close files
#endif
	                    break;
					}
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					if(!(loop_since_io%3000)) {
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						OutputDebugString(".");

						// Let's make sure the socket is up
						// Sending will trigger a socket d/c detection
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						send_telnet_cmd(TELNET_GA,0);
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						// Check if the node has been interrupted
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						getnodedat(cfg.node_num,&thisnode,0);
						if(thisnode.misc&NODE_INTR)
							break;
					}
					Sleep(1);
				}
            } else
				loop_since_io=0;
        }
	}

	if(!native && !(mode&EX_OFFLINE) && !nt) {
		if(!DeviceIoControl(
			vxd,					// handle to device of interest
			SBBSEXEC_IOCTL_STOP,	// control code of operation to perform
			&hVM,					// pointer to buffer to supply input data
			sizeof(hVM),			// size of input buffer
			NULL,					// pointer to buffer to receive output data
			0,						// size of output buffer
			&rd,					// pointer to variable to receive output byte count
			NULL					// Overlapped I/O
			)) {
			errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_STOP);
		}
	}

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    if(!(mode&EX_BG)) {			/* !background execution */
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		if(retval==STILL_ACTIVE)
			TerminateProcess(process_info.hProcess, GetLastError());
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	 	// Get return value
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    	sprintf(str,"%sDOSXTRN.RET", cfg.node_dir);
        FILE* fp=fopen(str,"r");
        if(fp!=NULL) {
			fscanf(fp,"%d",&retval);
			fclose(fp);
		}
	}

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	XTRN_CLEANUP;
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	CloseHandle(process_info.hProcess);
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	if(!(mode&EX_OFFLINE)) {	/* !off-line execution */

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		if(native) {
			ulong l=0;
			ioctlsocket(client_socket, FIONBIO, &l);
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			pthread_mutex_unlock(&input_thread_mutex);
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		}
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		curatr=0;	// Can't guarantee current attributes
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		rio_abortable=rio_abortable_save;	// Restore abortable state
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		/* Got back to Text/NVT mode */
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		send_telnet_cmd(TELNET_DONT,TELNET_BINARY);
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		telnet_mode&=~TELNET_MODE_BIN_RX;
	}
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//	lprintf("%s returned %d",realcmdline, retval);

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	errorlevel = retval; // Baja-retrievable error value

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	return(retval);
}

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#else	/* !WIN32 */

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/*****************************************************************************/
// Expands Unix LF to CRLF
/*****************************************************************************/
BYTE* lf_expand(BYTE* inbuf, ulong inlen, BYTE* outbuf, ulong& newlen)
{
	ulong	i,j;

	for(i=j=0;i<inlen;i++) {
		if(inbuf[i]=='\n' && (!i || inbuf[i-1]!='\r'))
			outbuf[j++]='\r';
		outbuf[j++]=inbuf[i];
	}
	newlen=j;
    return(outbuf);
}

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#define MAX_ARGS 1000

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int sbbs_t::external(char* cmdline, long mode, char* startup_dir)
{
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	char	str[256];
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	char	fname[128];
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	char*	argv[MAX_ARGS];
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	char*	p;
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	BYTE*	bp;
	BYTE	buf[XTRN_IO_BUF_LEN];
    BYTE 	output_buf[XTRN_IO_BUF_LEN*2];
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	ulong	avail;
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    ulong	output_len;
	bool	native=false;			// DOS program by default
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	int		i;
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	int		rd;
	int		wr;
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	int		argc;
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	pid_t	pid;
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	int		in_pipe[2];
	int		out_pipe[2];
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	fd_set ibits;
	struct timeval timeout;
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	XTRN_LOADABLE_MODULE;
	XTRN_LOADABLE_JS_MODULE;
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	attr(cfg.color[clr_external]);        /* setup default attributes */

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    SAFECOPY(str,cmdline);		/* Set str to program name only */
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    p=strchr(str,SP);
    if(p) *p=0;
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    SAFECOPY(fname,str);
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    p=strrchr(fname,'/');
    if(!p) p=strrchr(fname,'\\');
    if(!p) p=strchr(fname,':');
    if(!p) p=fname;
    else   p++;

    for(i=0;i<cfg.total_natvpgms;i++)
        if(!stricmp(p,cfg.natvpgm[i]->name))
            break;
    if(i<cfg.total_natvpgms || mode&EX_NATIVE)
        native=true;

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#ifndef __FreeBSD__
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	if(!native) {
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		bprintf("\r\nExternal DOS programs are not yet supported in\r\n%s\r\n",VERSION_NOTICE);
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		return(-1);
	}
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#endif
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 	if(native) { // Native (32-bit) external

		// Current environment passed to child process
		sprintf(dszlog,"DSZLOG=%sPROTOCOL.LOG",cfg.node_dir);
		sprintf(sbbsnode,"SBBSNODE=%s",cfg.node_dir);
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		sprintf(sbbsctrl,"SBBSCTRL=%s",cfg.ctrl_dir);
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		sprintf(sbbsctrl,"SBBSDATA=%s",cfg.data_dir);
		sprintf(sbbsctrl,"SBBSEXEC=%s",cfg.exec_dir);
		sprintf(sbbsnnum,"SBBSNNUM=%d",cfg.node_num);
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		putenv(dszlog); 		/* Makes the DSZ LOG active */
		putenv(sbbsnode);
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		putenv(sbbsctrl);
		putenv(sbbsdata);
		putenv(sbbsexec);
		if(putenv(sbbsnnum))
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        	errormsg(WHERE,ERR_WRITE,"environment",0);
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	} else {
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#ifdef __FreeBSD__
		/* ToDo: This seems to work for every door except Iron Ox
		   ToDo: Iron Ox is unique in that it runs perfectly from
		   ToDo: tcsh but not at all from anywhere else, complaining
		   ToDo: about corrupt files.  I've ruled out the possibilty
		   ToDo: of it being a terminal mode issue... no other ideas
		   ToDo: come to mind. */

		FILE * doscmdrc;

		sprintf(str,"%s.doscmdrc",cfg.node_dir);
		if((doscmdrc=fopen(str,"w+"))==NULL)  {
			errormsg(WHERE,ERR_CREATE,str,0);
			return(-1);
		}
		if(startup_dir!=NULL && startup_dir[0])
			fprintf(doscmdrc,"assign C: %s\n",startup_dir);
		else
			fprintf(doscmdrc,"assign C: .\n");

		fprintf(doscmdrc,"assign D: %s\n",cfg.node_dir);
		SAFECOPY(str,cfg.exec_dir);
		if((p=strrchr(str,'/'))!=NULL)
			*p=0;
		if((p=strrchr(str,'/'))!=NULL)
			*p=0;
		fprintf(doscmdrc,"assign E: %s\n",str);
		
		/* setup doscmd env here */
		/* ToDo Note, this assumes that the BBS uses standard dir names */
		fprintf(doscmdrc,"DSZLOG=E:\\node%d\\PROTOCOL.LOG\n",cfg.node_num);
		fprintf(doscmdrc,"SBBSNODE=D:\\\n");
		fprintf(doscmdrc,"SBBSCTRL=E:\\ctrl\\\n");
		fprintf(doscmdrc,"SBBSDATA=E:\\data\\\n");
		fprintf(doscmdrc,"SBBSEXEC=E:\\exec\\\n");
		fprintf(doscmdrc,"SBBSNNUM=%d\n",cfg.node_num);

		fclose(doscmdrc);
		SAFECOPY(str,cmdline);
		sprintf(cmdline,"/usr/bin/doscmd -xFQ %s",str);
#endif
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	}

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	if(!(mode&EX_INR))
		pthread_mutex_lock(&input_thread_mutex);
1045
1046
1047
1048
1049
1050
1051
1052
1053

	if((mode&EX_INR) && (mode&EX_OUTR))  {
		struct winsize winsize;
		winsize.ws_row=rows;
		// #warning Currently cols are forced to 80 apparently TODO
		winsize.ws_col=80;
		if((pid=forkpty(&in_pipe[1],NULL,NULL,&winsize))==-1) {
			pthread_mutex_unlock(&input_thread_mutex);
			errormsg(WHERE,ERR_EXEC,cmdline,0);
1054
1055
			return(-1);
		}
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
		out_pipe[0]=in_pipe[1];
	}
	else  {
		if(mode&EX_INR)
			if(pipe(in_pipe)!=0) {
				errormsg(WHERE,ERR_CREATE,"in_pipe",0);
				return(-1);
			}
		if(mode&EX_OUTR)
			if(pipe(out_pipe)!=0) {
				errormsg(WHERE,ERR_CREATE,"out_pipe",0);
				return(-1);
			}


		if((pid=fork())==-1) {
			pthread_mutex_unlock(&input_thread_mutex);
			errormsg(WHERE,ERR_EXEC,cmdline,0);
1074
1075
			return(-1);
		}
1076
1077
	}
	if(pid==0) {	/* child process */
1078
		setup_term(0, startup->xtrn_term);
1079
1080
1081
1082
1083
#ifdef __FreeBSD__
		if(!native)
			chdir(cfg.node_dir);
		else
#endif
1084
1085
		if(startup_dir!=NULL && startup_dir[0])
			chdir(startup_dir);
1086

1087
		if(mode&EX_SH || strcspn(cmdline,"<>|;")!=strlen(cmdline)) {
1088
1089
1090
1091
1092
1093
1094
			argv[0]=comspec;
			argv[1]="-c";
			argv[2]=cmdline;
			argv[3]=NULL;
		} else {
			argv[0]=cmdline;	/* point to the beginning of the string */
			argc=1;
1095
			for(i=0;cmdline[i] && argc<MAX_ARGS;i++)	/* Break up command line */
1096
1097
1098
1099
1100
1101
				if(cmdline[i]==SP) {
					cmdline[i]=0;			/* insert nulls */
					argv[argc++]=cmdline+i+1; /* point to the beginning of the next arg */
				}
			argv[argc]=NULL;
		}
1102

1103
		if(mode&EX_INR && !(mode&EX_OUTR))  {
1104
1105
1106
1107
			close(in_pipe[1]);		/* close write-end of pipe */
			dup2(in_pipe[0],0);		/* redirect stdin */
			close(in_pipe[0]);		/* close excess file descriptor */
		}
1108

1109
		if(mode&EX_OUTR && !(mode&EX_INR)) {
1110
1111
1112
1113
			close(out_pipe[0]);		/* close read-end of pipe */
			dup2(out_pipe[1],1);	/* stdout */
			dup2(out_pipe[1],2);	/* stderr */
			close(out_pipe[1]);		/* close excess file descriptor */
1114
1115
		}	

1116
1117
1118
1119
1120
		if(mode&EX_BG)	/* background execution, detach child */
		{
			if(fork())
				exit(0);
			lprintf("Detaching external process pgid=%d",setsid());
1121
1122
   	    }
	
1123
		execvp(argv[0],argv);
1124
1125
		sprintf(str,"!ERROR %d executing %s",errno,argv[0]);
		errorlog(str);
1126
		exit(-1);	/* should never get here */
1127
	}
1128

1129
1130
	lprintf("Node %d executing external: %s",cfg.node_num,cmdline);
	
1131
	if(mode&EX_OUTR) {
1132
1133
		if(!(mode&EX_INR))
			close(out_pipe[1]);	/* close write-end of pipe */
1134
		while(!terminated) {
1135
1136
			if(waitpid(pid, &i, WNOHANG)!=0)	/* child exited */
				break;
1137
1138
1139

			if(mode&EX_CHKTIME)
				gettimeleft();
1140
			
1141
1142
1143
1144
1145
1146
			if(!online && !(mode&EX_OFFLINE)) {
				sprintf(str,"%s hung-up in external program",useron.alias);
				logline("X!",str);
				break;
			}

1147
1148
1149
1150
1151
1152
1153
			/* Input */	
			if(mode&EX_INR && RingBufFull(&inbuf)) {
				if((wr=RingBufRead(&inbuf,buf,sizeof(buf)))!=0)
					write(in_pipe[1],buf,wr);
			}
				
			/* Output */
1154
#if 0
1155
1156
1157
1158
1159
			ioctl(out_pipe[0],FIONREAD,&rd);	/* peek at input */
			if(!rd) {
				mswait(1);
				continue;
			}
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
#else
			FD_ZERO(&ibits);
			FD_SET(out_pipe[0],&ibits);
			timeout.tv_sec=0;
			timeout.tv_usec=0;
			if(!select(out_pipe[0]+1,&ibits,NULL,NULL,&timeout))  {
				mswait(1);
				continue;
			}
#endif
1170
1171
1172

			avail=RingBufFree(&outbuf);
			if(avail==0) {
1173
				lprintf("Node %d !output buffer full (%u bytes)"
1174
						,cfg.node_num,RingBufFull(&outbuf));
1175
1176
1177
1178
				mswait(1);
				continue;
			}

1179
#if 0
1180
			if(rd>(int)avail)
1181
#endif
1182
				rd=avail;
1183

1184
			if(rd>(int)sizeof(buf))
1185
1186
1187
				rd=sizeof(buf);

			if((rd=read(out_pipe[0],buf,rd))<1) {
1188
1189
1190
				mswait(1);
				continue;
			}
1191
				
1192
			if(mode&EX_BIN)	/* telnet IAC expansion */
1193
   	       		bp=telnet_expand(buf, rd, output_buf, output_len);
1194
1195
1196
			else			/* LF to CRLF expansion */
				bp=lf_expand(buf, rd, output_buf, output_len);
			
1197
1198
			/* Does expanded size fit? */
			if(output_len>RingBufFree(&outbuf)) {
1199
				lprintf("Node %d !output buffer overflow (%u bytes)"
1200
1201
1202
1203
					,cfg.node_num,output_len);
				mswait(1);
				continue;
			}
1204
	
1205
1206
1207
			RingBufWrite(&outbuf, bp, output_len);
			sem_post(&output_sem);	
		}
1208

1209
1210
1211
		if(waitpid(pid, &i, WNOHANG)==0)  {		// Child still running? 
			kill(pid, SIGHUP);					// Tell child user has hung up
			time_t start=time(NULL);			// Wait up to 10 seconds
1212
			while(time(NULL)-start<10) {		// for child to terminate
1213
1214
1215
1216
1217
1218
1219
				if(waitpid(pid, &i, WNOHANG)!=0)
					break;
				mswait(500);
			}
			if(waitpid(pid, &i, WNOHANG)==0)	// Child still running?
				kill(pid, SIGKILL);				// terminate child process
		}
1220
1221
1222
1223
		/* close unneeded descriptors */
		if(mode&EX_INR)
			close(in_pipe[1]);
		close(out_pipe[0]);
1224
	}
1225

1226
	waitpid(pid, &i, 0); /* Wait for child to terminate */
1227
1228
1229
1230

	pthread_mutex_unlock(&input_thread_mutex);

	return(WEXITSTATUS(i));
1231
1232
1233
1234
}

#endif	/* !WIN32 */

1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
uint fakeriobp=0xffff;

/*****************************************************************************/
/* Returns command line generated from instr with %c replacments             */
/*****************************************************************************/
char * sbbs_t::cmdstr(char *instr, char *fpath, char *fspec, char *outstr)
{
	char	str[256],*cmd;
    int		i,j,len;

    if(outstr==NULL)
        cmd=cmdstr_output;
    else
        cmd=outstr;
    len=strlen(instr);
1250
    for(i=j=0;i<len && j<(int)sizeof(cmdstr_output);i++) {
1251
1252
1253
        if(instr[i]=='%') {
            i++;
            cmd[j]=0;
1254
1255
1256
1257
			char ch=instr[i];
			if(isalpha(ch))
				ch=toupper(ch);
            switch(ch) {
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
                case 'A':   /* User alias */
                    strcat(cmd,useron.alias);
                    break;
                case 'B':   /* Baud (DTE) Rate */
                    strcat(cmd,ultoa(dte_rate,str,10));
                    break;
                case 'C':   /* Connect Description */
                    strcat(cmd,connection);
                    break;
                case 'D':   /* Connect (DCE) Rate */
                    strcat(cmd,ultoa((ulong)cur_rate,str,10));
                    break;
                case 'E':   /* Estimated Rate */
                    strcat(cmd,ultoa((ulong)cur_cps*10,str,10));
                    break;
                case 'F':   /* File path */
                    strcat(cmd,fpath);
                    break;
                case 'G':   /* Temp directory */
                    strcat(cmd,cfg.temp_dir);
                    break;
                case 'H':   /* Port Handle or Hardware Flow Control */
1280
1281
1282
#if defined(__unix__)
					strcat(cmd,ultoa(client_socket,str,10));
#else
1283
                    strcat(cmd,ultoa(client_socket_dup,str,10));
1284
#endif
1285
1286
                    break;
                case 'I':   /* UART IRQ Line */
1287
                    strcat(cmd,ultoa(cfg.com_irq,str,10));
1288
1289
1290
1291
1292
1293
1294
1295
                    break;
                case 'J':
                    strcat(cmd,cfg.data_dir);
                    break;
                case 'K':
                    strcat(cmd,cfg.ctrl_dir);
                    break;
                case 'L':   /* Lines per message */
1296
                    strcat(cmd,ultoa(cfg.level_linespermsg[useron.level],str,10));
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
                    break;
                case 'M':   /* Minutes (credits) for user */
                    strcat(cmd,ultoa(useron.min,str,10));
                    break;
                case 'N':   /* Node Directory (same as SBBSNODE environment var) */
                    strcat(cmd,cfg.node_dir);
                    break;
                case 'O':   /* SysOp */
                    strcat(cmd,cfg.sys_op);
                    break;
                case 'P':   /* COM Port */
1308
                    strcat(cmd,ultoa(online==ON_LOCAL ? 0:cfg.com_port,str,10));
1309
1310
1311
1312
1313
                    break;
                case 'Q':   /* QWK ID */
                    strcat(cmd,cfg.</