xtrn.cpp 45.5 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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	#define TTYDEFCHARS		// needed for ttydefchars definition

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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
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	#ifdef NEEDS_FORKPTY
	#include <grp.h>
	#endif

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	#include <termios.h>
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#if defined(__solaris__)
	#define TTYDEF_IFLAG    (BRKINT | ICRNL | IMAXBEL | IXON | IXANY)
	#define TTYDEF_OFLAG    (OPOST | ONLCR)
	#define TTYDEF_LFLAG    (ECHO | ICANON | ISIG | IEXTEN | ECHOE|ECHOKE|ECHOCTL)
	#define TTYDEF_CFLAG    (CREAD | CS8 | HUPCL)
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	static cc_t     ttydefchars[NCCS] = {
        CEOF,   CEOL,   CEOL,   CERASE, CWERASE, CKILL, CREPRINT,
        CERASE2, CINTR, CQUIT,  CSUSP,  CDSUSP, CSTART, CSTOP,  CLNEXT,
        CDISCARD, CMIN, CTIME,  CSTATUS, _POSIX_VDISABLE
	};
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#endif

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#endif	/* __unix__ */

#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;
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	struct	tm tm;
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	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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	if(localtime_r(&now,&tm)==NULL)
		memset(&tm,0,sizeof(tm));
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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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		/* date/time env vars */
		sprintf(env_day			,"DAY=%02u"			,tm.tm_mday);
		sprintf(env_weekday		,"WEEKDAY=%s"		,wday[tm.tm_wday]);
		sprintf(env_monthname	,"MONTHNAME=%s"		,mon[tm.tm_mon]);
		sprintf(env_month		,"MONTH=%02u"		,tm.tm_mon+1);
		sprintf(env_year		,"YEAR=%u"			,1900+tm.tm_year);
		putenv(env_day);
		putenv(env_weekday);
		putenv(env_monthname);
		putenv(env_month);
		if(putenv(env_year))
        	errormsg(WHERE,ERR_WRITE,"environment",0);
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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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		/* date/time env vars */
		fprintf(fp, "DAY=%02u\n", tm.tm_mday);
		fprintf(fp, "WEEKDAY=%s\n",wday[tm.tm_wday]);
		fprintf(fp, "MONTHNAME=%s\n",mon[tm.tm_mon]);
		fprintf(fp, "MONTH=%02u\n",tm.tm_mon+1);
		fprintf(fp, "YEAR=%u\n",1900+tm.tm_year);
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        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)) {
513
514
515
516
517
518
			errormsg(WHERE,ERR_CREATE,"stdout pipe",0);
			return(GetLastError());
		}
		startup_info.hStdError=startup_info.hStdOutput;

		// Create the child input pipe.
519
		if(!CreatePipe(&startup_info.hStdInput,&wrinpipe,&sa,0)) {
520
521
522
			errormsg(WHERE,ERR_CREATE,"stdin pipe",0);
			return(GetLastError());
		}
523

524
525
526
527
528
529
530
531
532
533
534
535
536
537
		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;
	}
538
	if(native && !(mode&EX_OFFLINE)) {
539
		/* temporary */
540
541
542
		FILE* fp;
		sprintf(fname,"%sDOOR32.SYS",cfg.node_dir);
		fp=fopen(fname,"wb");
543
		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"
544
			"%d\r\n%d\r\n"
545
546
			,mode&EX_OUTR ? 0 /* Local */ : 2 /* Telnet */
			,mode&EX_OUTR ? INVALID_SOCKET : client_socket_dup
547
			,VERSION_NOTICE,REVISION
548
549
550
551
552
553
554
555
			,useron.number
			,useron.name
			,useron.alias
			,useron.level
			,timeleft/60
			,useron.misc&ANSI ? 1 : 0
			,cfg.node_num);
		fclose(fp);
556
557

		/* not temporary */
558
		if(!(mode&EX_INR)) {
559
			pthread_mutex_lock(&input_thread_mutex);
560
561
			input_thread_mutex_locked=true;
		}
562
563
564
565
566
567
568
	}

    if(!CreateProcess(
		NULL,			// pointer to name of executable module
		fullcmdline,  	// pointer to command line string
		NULL,  			// process security attributes
		NULL,   		// thread security attributes
569
		native && !(mode&EX_OFFLINE),	 			// handle inheritance flag
570
		CREATE_NEW_CONSOLE/*|CREATE_SEPARATE_WOW_VDM*/, // creation flags
571
572
573
574
575
        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
		)) {
576
		XTRN_CLEANUP;
577
578
579
580
		if(input_thread_mutex_locked) {
			pthread_mutex_unlock(&input_thread_mutex);
			input_thread_mutex_locked=false;
		}
581
		SetLastError(last_error);	/* Restore LastError */
582
583
584
585
        errormsg(WHERE, ERR_EXEC, realcmdline, mode);
        return(GetLastError());
    }

586
587
588
589
590
591
592
593
594
595
596
#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

597
598
	CloseHandle(process_info.hThread);

599
600
601
602
603
	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) {
604
				XTRN_CLEANUP;
605
                TerminateProcess(process_info.hProcess, __LINE__);
606
				CloseHandle(process_info.hProcess);
607
608
609
610
611
				errormsg(WHERE, ERR_TIMEOUT, "start_event", retval);
				return(GetLastError());
			}

			CloseHandle(start_event);
612
			start_event=NULL;	/* Mark as closed */
613
614
615
616
617
618
619
620
621
622
623

			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
				)) {
624
				XTRN_CLEANUP;
625
                TerminateProcess(process_info.hProcess, __LINE__);
626
				CloseHandle(process_info.hProcess);
627
628
629
630
631
				errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_COMPLETE);
				return(GetLastError());
			}
		}
	}
632
    ReleaseMutex(exec_mutex);
633

634
	/* Disable Ctrl-C checking */
635
636
637
638
	if(!(mode&EX_OFFLINE)) {
		rio_abortable_save=rio_abortable;
		rio_abortable=false;
	}
639

640
    // Executing app in foreground?, monitor
641
    retval=STILL_ACTIVE;
642
    while(!(mode&EX_BG)) {
643
644
		if(mode&EX_CHKTIME)
			gettimeleft();
645
646
        if(!online && !(mode&EX_OFFLINE)) { // Tell VXD/VDD and external that user hung-up
        	if(was_online) {
647
648
				sprintf(str,"%s hung-up in external program",useron.alias);
				logline("X!",str);
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
            	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);
        }
672
673
		if((native && !use_pipes) || mode&EX_OFFLINE) {	
			/* Monitor for process termination only */
674
675
676
677
678
679
680
681
682
683
            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 {

684
			if(nt || use_pipes) {	// Windows NT/2000
685
686
687
688
689

				/* Write to VDD */

				wr=RingBufPeek(&inbuf,buf,sizeof(buf));
				if(wr) {
690
					if(!use_pipes && wrslot==INVALID_HANDLE_VALUE) {
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
						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
					}
707
					
708
709
710
711
712
					/* CR expansion */
					if(use_pipes) 
						bp=cr_expand(buf,wr,output_buf,wr);
					else
						bp=buf;
713

714
					if(wrslot!=INVALID_HANDLE_VALUE
715
						&& WriteFile(wrslot,bp,wr,&len,NULL)==TRUE) {
716
717
						RingBufRead(&inbuf, NULL, len);
						wr=len;
718
719
						if(use_pipes) {
							/* echo */
720
							RingBufWrite(&outbuf, bp, wr);
721
722
							sem_post(&output_sem);
						}
723
724
725
726
727
728
					} else		// VDD not loaded yet
						wr=0;
				}

				/* Read from VDD */

729
				rd=0;
730
				len=sizeof(buf);
731
				avail=RingBufFree(&outbuf)/2;	// leave room for wwiv/telnet expansion
732
#if 0
733
				if(avail==0)
734
					lprintf("Node %d !output buffer full (%u bytes)"
735
						,cfg.node_num,RingBufFull(&outbuf));
736
#endif
737
738
				if(len>avail)
            		len=avail;
739

740
				while(rd<len) {
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
					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) {
768
769
770
771
772
					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 {
773
                		bp=telnet_expand(buf, rd, telnet_buf, rd);
774
775
776
						if(rd>sizeof(telnet_buf))
							errorlog("TELNET_BUF OVERRUN");
					}
777
778
779
					if(rd>RingBufFree(&outbuf)) {
						errorlog("output buffer overflow");
						rd=RingBufFree(&outbuf);
780
					}
781
					RingBufWrite(&outbuf, bp, rd);
782
					sem_post(&output_sem);
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
				}
			} 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);
811
812
				avail=RingBufFree(&outbuf)/2;	// leave room for wwiv/telnet expansion
#if 0
813
				if(avail==0) 
814
					lprintf("Node %d !output buffer full (%u bytes)"
815
						,cfg.node_num,RingBufFull(&outbuf));
816
#endif
817

818
819
				if(len>avail)
            		len=avail;
820
				if(len) {
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
					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

839
					if(mode&EX_WWIV) {
840
                		bp=wwiv_expand(buf, rd, wwiv_buf, rd, useron.misc, wwiv_flag);
841
842
843
						if(rd>sizeof(wwiv_buf))
							errorlog("WWIV_BUF OVERRUN");
					} else {
844
                		bp=telnet_expand(buf, rd, telnet_buf, rd);
845
846
847
848
849
850
851
						if(rd>sizeof(telnet_buf))
							errorlog("TELNET_BUF OVERRUN");
					}
					if(rd>RingBufFree(&outbuf)) {
						errorlog("output buffer overflow");
						rd=RingBufFree(&outbuf);
					}
852
					RingBufWrite(&outbuf, bp, rd);
853
					sem_post(&output_sem);
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
				}
			}
            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;
					}
870
871
					

872
					if(!(loop_since_io%3000)) {
873
874
875
876
						OutputDebugString(".");

						// Let's make sure the socket is up
						// Sending will trigger a socket d/c detection
877
878
						if(!(startup->options&BBS_OPT_NO_TELNET_GA))
							send_telnet_cmd(TELNET_GA,0);
879
880

						// Check if the node has been interrupted
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
						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);
		}
	}

907
    if(!(mode&EX_BG)) {			/* !background execution */
908

909
910
		if(retval==STILL_ACTIVE)
			TerminateProcess(process_info.hProcess, GetLastError());
911

912
	 	// Get return value
913
914
915
916
917
918
919
920
    	sprintf(str,"%sDOSXTRN.RET", cfg.node_dir);
        FILE* fp=fopen(str,"r");
        if(fp!=NULL) {
			fscanf(fp,"%d",&retval);
			fclose(fp);
		}
	}

921
	XTRN_CLEANUP;
922
	CloseHandle(process_info.hProcess);
923
924
925

	if(!(mode&EX_OFFLINE)) {	/* !off-line execution */

926
927
928
		if(native) {
			ulong l=0;
			ioctlsocket(client_socket, FIONBIO, &l);
929
930
931
932
			if(input_thread_mutex_locked) {
				pthread_mutex_unlock(&input_thread_mutex);
				input_thread_mutex_locked=false;
			}
933
		}
934

935
936
		curatr=~0;			// Can't guarantee current attributes
		attr(LIGHTGRAY);	// Force to "normal"
937

938
		rio_abortable=rio_abortable_save;	// Restore abortable state
939

940
		/* Got back to Text/NVT mode */
941
942
943
944
		if(telnet_mode&TELNET_MODE_BIN_RX) {
			send_telnet_cmd(TELNET_DONT,TELNET_BINARY);
			telnet_mode&=~TELNET_MODE_BIN_RX;
		}
945
	}
946

947
948
//	lprintf("%s returned %d",realcmdline, retval);

949
950
	errorlevel = retval; // Baja-retrievable error value

951
952
953
	return(retval);
}

954
955
#else	/* !WIN32 */

956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
/*****************************************************************************/
// 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);
}

972
973
#define MAX_ARGS 1000

974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
#ifdef NEEDS_FORKPTY
static int login_tty(int fd)
{
	(void) setsid();
	if (!isatty(fd))
		return (-1);
	(void) dup2(fd, 0);
	(void) dup2(fd, 1);
	(void) dup2(fd, 2);
	if (fd > 2)
		(void) close(fd);
	return (0);
}

static int openpty(int *amaster, int *aslave, char *name, struct termios *termp, winsize *winp)
{
	char line[] = "/dev/ptyXX";
	const char *cp1, *cp2;
	int master, slave, ttygid;
	struct group *gr;

	if ((gr = getgrnam("tty")) != NULL)
		ttygid = gr->gr_gid;
	else
		ttygid = -1;

	for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
		line[8] = *cp1;
		for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
			line[5] = 'p';
			line[9] = *cp2;
			if ((master = open(line, O_RDWR, 0)) == -1) {
				if (errno == ENOENT)
					break; /* try the next pty group */
			} else {
				line[5] = 't';
				(void) chown(line, getuid(), ttygid);
				(void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
				/* Hrm... SunOS doesn't seem to have revoke
				(void) revoke(line); */
				if ((slave = open(line, O_RDWR, 0)) != -1) {
					*amaster = master;
					*aslave = slave;
					if (name)
						strcpy(name, line);
					if (termp)
						(void) tcsetattr(slave,
							TCSAFLUSH, termp);
					if (winp)
						(void) ioctl(slave, TIOCSWINSZ,
							(char *)winp);
					return (0);
				}
				(void) close(master);
			}
		}
	}
	errno = ENOENT;	/* out of ptys */
	return (-1);
}

static int forkpty(int *amaster, char *name, termios *termp, winsize *winp)
{
	int master, slave, pid;

	if (openpty(&master, &slave, name, termp, winp) == -1)
		return (-1);
	switch (pid = fork()) {
	case -1:
		return (-1);
	case 0:
		/*
		 * child
		 */
		(void) close(master);
		login_tty(slave);
		return (0);
	}
	/*
	 * parent
	 */
	*amaster = master;
	(void) close(slave);
	return (pid);
}
#endif /* NEED_FORKPTY */

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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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	bool	rio_abortable_save;
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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
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		sprintf(dszlog,"%sPROTOCOL.LOG",cfg.node_dir);
		setenv("DSZLOG",dszlog,1); 		/* Makes the DSZ LOG active */
		setenv("SBBSNODE",cfg.node_dir,1);
		setenv("SBBSCTRL",cfg.ctrl_dir,1);
		setenv("SBBSDATA",cfg.data_dir,1);
		setenv("SBBSEXEC",cfg.exec_dir,1);
		sprintf(sbbsnnum,"%u",cfg.node_num);
		if(setenv("SBBSNNUM",sbbsnnum,1))
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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);
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		sprintf(cmdline,"/usr/bin/doscmd -F %s",str);
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#endif
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	}

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	if(!(mode&EX_INR))
		pthread_mutex_lock(&input_thread_mutex);
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	if((mode&EX_INR) && (mode&EX_OUTR))  {
		struct winsize winsize;
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		struct termios term;
		memset(&term,0,sizeof(term));
		cfsetspeed(&term,B19200);
		if(mode&EX_BIN)
			cfmakeraw(&term);
		else {
			term.c_iflag = TTYDEF_IFLAG;
			term.c_oflag = TTYDEF_OFLAG;
			term.c_lflag = TTYDEF_LFLAG;
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			term.c_cflag = TTYDEF_CFLAG;
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			memcpy(term.c_cc,ttydefchars,sizeof(term.c_cc));
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		}
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		winsize.ws_row=rows;
		// #warning Currently cols are forced to 80 apparently TODO
		winsize.ws_col=80;
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		if((pid=forkpty(&in_pipe[1],NULL,&term,&winsize))==-1) {
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			pthread_mutex_unlock(&input_thread_mutex);
			errormsg(WHERE,ERR_EXEC,cmdline,0);
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			return(-1);
		}
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		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);
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			return(-1);
		}
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	}
	if(pid==0) {	/* child process */
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		sigset_t        sigs;
		sigfillset(&sigs);
		sigprocmask(SIG_UNBLOCK,&sigs,NULL);
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		if(!(mode&EX_BIN))  {
			static char	term_env[256];
			sprintf(term_env,"TERM=%s",startup->xtrn_term);
			putenv(term_env);
		}
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#ifdef __FreeBSD__
		if(!native)
			chdir(cfg.node_dir);
		else
#endif
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		if(startup_dir!=NULL && startup_dir[0])
			chdir(startup_dir);
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		if(mode&EX_SH || strcspn(cmdline,"<>|;")!=strlen(cmdline)) {
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			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;
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			for(i=0;cmdline[i] && argc<MAX_ARGS;i++)	/* Break up command line */
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				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;
		}
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		if(mode&EX_INR && !(mode&EX_OUTR))  {
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			close(in_pipe[1]);		/* close write-end of pipe */
			dup2(in_pipe[0],0);		/* redirect stdin */
			close(in_pipe[0]);		/* close excess file descriptor */
		}
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		if(mode&EX_OUTR && !(mode&EX_INR)) {
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			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 */
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		}	

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		if(mode&EX_BG)	/* background execution, detach child */
		{
			if(fork())
				exit(0);
			lprintf("Detaching external process pgid=%d",setsid());
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   	    }
	
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		execvp(argv[0],argv);
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		sprintf(str,"!ERROR %d executing %s",errno,argv[0]);
		errorlog(str);
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		exit(-1);	/* should never get here */
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	}
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	lprintf("Node %d executing external: %s",cfg.node_num,cmdline);
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	/* Disable Ctrl-C checking */
	if(!(mode&EX_OFFLINE)) {
		rio_abortable_save=rio_abortable;
		rio_abortable=false;
	}
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	if(mode&EX_OUTR) {
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		if(!(mode&EX_INR))
			close(out_pipe[1]);	/* close write-end of pipe */
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		while(!terminated) {
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			if(waitpid(pid, &i, WNOHANG)!=0)	/* child exited */
				break;
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			if(mode&EX_CHKTIME)
				gettimeleft();
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			if(!online && !(mode&EX_OFFLINE)) {
				sprintf(str,"%s hung-up in external program",useron.alias);
				logline("X!",str);
				break;
			}

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			/* Input */	
			if(mode&EX_INR && RingBufFull(&inbuf)) {
				if((wr=RingBufRead(&inbuf,buf,sizeof(buf)))!=0)
					write(in_pipe[1],buf,wr);
			}
				
			/* Output */
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			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;
			}
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			avail=RingBufFree(&outbuf)/2;	// Leave room for wwiv/telnet expansion
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			if(avail==0) {
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#if 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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#endif
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				mswait(1);
				continue;
			}

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			rd=avail;
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			if(rd>(int)sizeof(buf))
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				rd=sizeof(buf);

			if((rd=read(out_pipe[0],buf,rd))<1) {
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				mswait(1);
				continue;
			}
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			if(mode&EX_BIN)	/* telnet IAC expansion */
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   	       		bp=telnet_expand(buf, rd, output_buf, output_len);