xtrn.cpp 45.2 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 												*/
/****************************************************************************/
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int sbbs_t::external(const char* cmdline, long mode, const char* startup_dir)
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{
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	char	str[MAX_PATH+1],*p;
	const char* p_startup_dir;
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	char	path[MAX_PATH+1];
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	char	fname[MAX_PATH+1];
    char	fullcmdline[MAX_PATH+1];
	char	realcmdline[MAX_PATH+1];
	char	comspec_str[MAX_PATH+1];
	char	title[MAX_PATH+1];
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	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=rio_abortable;
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	bool	use_pipes=false;	// NT-compatible console redirection
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	BOOL	processTerminated=false;
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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 */
	truncstr(str," ");
    SAFECOPY(fname,getfname(str));
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    for(i=0;i<cfg.total_natvpgms;i++)
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        if(!stricmp(fname,cfg.natvpgm[i]->name))
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            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

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		sprintf(path,"%sDOSXTRN.RET", cfg.node_dir);
		remove(path);
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    	// Create temporary environment file
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    	sprintf(path,"%sDOSXTRN.ENV", cfg.node_dir);
        FILE* fp=fopen(path,"w");
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        if(fp==NULL) {
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			XTRN_CLEANUP;
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        	errormsg(WHERE, ERR_CREATE, path, 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);

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		SAFECOPY(str,path);	// incase GetShortPathName fails
		GetShortPathName(path,str,sizeof(str));
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        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)) {
511
512
513
514
515
516
			errormsg(WHERE,ERR_CREATE,"stdout pipe",0);
			return(GetLastError());
		}
		startup_info.hStdError=startup_info.hStdOutput;

		// Create the child input pipe.
517
		if(!CreatePipe(&startup_info.hStdInput,&wrinpipe,&sa,0)) {
518
519
520
			errormsg(WHERE,ERR_CREATE,"stdin pipe",0);
			return(GetLastError());
		}
521

522
523
524
525
526
527
528
529
530
531
532
533
534
535
		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;
	}
536
	if(native && !(mode&EX_OFFLINE)) {
537
		/* temporary */
538
539
540
		FILE* fp;
		sprintf(fname,"%sDOOR32.SYS",cfg.node_dir);
		fp=fopen(fname,"wb");
541
		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"
542
			"%d\r\n%d\r\n"
543
544
			,mode&EX_OUTR ? 0 /* Local */ : 2 /* Telnet */
			,mode&EX_OUTR ? INVALID_SOCKET : client_socket_dup
545
			,VERSION_NOTICE,REVISION
546
547
548
549
550
551
552
553
			,useron.number
			,useron.name
			,useron.alias
			,useron.level
			,timeleft/60
			,useron.misc&ANSI ? 1 : 0
			,cfg.node_num);
		fclose(fp);
554
555

		/* not temporary */
556
		if(!(mode&EX_INR) && input_thread_running) {
557
			pthread_mutex_lock(&input_thread_mutex);
558
559
			input_thread_mutex_locked=true;
		}
560
561
562
563
564
565
566
	}

    if(!CreateProcess(
		NULL,			// pointer to name of executable module
		fullcmdline,  	// pointer to command line string
		NULL,  			// process security attributes
		NULL,   		// thread security attributes
567
		native && !(mode&EX_OFFLINE),	 			// handle inheritance flag
568
		CREATE_NEW_CONSOLE/*|CREATE_SEPARATE_WOW_VDM*/, // creation flags
569
570
571
572
573
        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
		)) {
574
		XTRN_CLEANUP;
575
		if(input_thread_mutex_locked && input_thread_running) {
576
577
578
			pthread_mutex_unlock(&input_thread_mutex);
			input_thread_mutex_locked=false;
		}
579
		SetLastError(last_error);	/* Restore LastError */
580
581
582
583
        errormsg(WHERE, ERR_EXEC, realcmdline, mode);
        return(GetLastError());
    }

584
585
586
587
588
589
590
591
592
593
594
#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

595
596
	CloseHandle(process_info.hThread);

597
598
599
600
601
	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) {
602
				XTRN_CLEANUP;
603
                TerminateProcess(process_info.hProcess, __LINE__);
604
				CloseHandle(process_info.hProcess);
605
606
607
608
609
				errormsg(WHERE, ERR_TIMEOUT, "start_event", retval);
				return(GetLastError());
			}

			CloseHandle(start_event);
610
			start_event=NULL;	/* Mark as closed */
611
612
613
614
615
616
617
618
619
620
621

			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
				)) {
622
				XTRN_CLEANUP;
623
                TerminateProcess(process_info.hProcess, __LINE__);
624
				CloseHandle(process_info.hProcess);
625
626
627
628
629
				errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_COMPLETE);
				return(GetLastError());
			}
		}
	}
630
    ReleaseMutex(exec_mutex);
631

632
	/* Disable Ctrl-C checking */
633
	if(!(mode&EX_OFFLINE))
634
		rio_abortable=false;
635

636
    // Executing app in foreground?, monitor
637
    retval=STILL_ACTIVE;
638
    while(!(mode&EX_BG)) {
639
640
		if(mode&EX_CHKTIME)
			gettimeleft();
641
642
        if(!online && !(mode&EX_OFFLINE)) { // Tell VXD/VDD and external that user hung-up
        	if(was_online) {
643
644
				sprintf(str,"%s hung-up in external program",useron.alias);
				logline("X!",str);
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
            	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;
            }
665
666
667
668
            if(hungup && time(NULL)-hungup>5 && !processTerminated) {
				lprintf("Node %d Terminating process from line %d",cfg.node_num,__LINE__);
				processTerminated=TerminateProcess(process_info.hProcess, 2112);
			}
669
        }
670
671
		if((native && !use_pipes) || mode&EX_OFFLINE) {	
			/* Monitor for process termination only */
672
673
674
675
676
677
678
679
680
681
            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 {

682
			if(nt || use_pipes) {	// Windows NT/2000
683
684
685
686
687

				/* Write to VDD */

				wr=RingBufPeek(&inbuf,buf,sizeof(buf));
				if(wr) {
688
					if(!use_pipes && wrslot==INVALID_HANDLE_VALUE) {
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
						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
					}
705
					
706
707
708
709
710
					/* CR expansion */
					if(use_pipes) 
						bp=cr_expand(buf,wr,output_buf,wr);
					else
						bp=buf;
711

712
					if(wrslot!=INVALID_HANDLE_VALUE
713
						&& WriteFile(wrslot,bp,wr,&len,NULL)==TRUE) {
714
715
						RingBufRead(&inbuf, NULL, len);
						wr=len;
716
717
						if(use_pipes) {
							/* echo */
718
							RingBufWrite(&outbuf, bp, wr);
719
720
							sem_post(&output_sem);
						}
721
722
723
724
725
726
					} else		// VDD not loaded yet
						wr=0;
				}

				/* Read from VDD */

727
				rd=0;
728
				len=sizeof(buf);
729
				avail=RingBufFree(&outbuf)/2;	// leave room for wwiv/telnet expansion
730
#if 0
731
				if(avail==0)
732
					lprintf("Node %d !output buffer full (%u bytes)"
733
						,cfg.node_num,RingBufFull(&outbuf));
734
#endif
735
736
				if(len>avail)
            		len=avail;
737

738
				while(rd<len) {
739
740
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
					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) {
766
767
768
769
770
					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 {
771
                		bp=telnet_expand(buf, rd, telnet_buf, rd);
772
773
774
						if(rd>sizeof(telnet_buf))
							errorlog("TELNET_BUF OVERRUN");
					}
775
776
777
					if(rd>RingBufFree(&outbuf)) {
						errorlog("output buffer overflow");
						rd=RingBufFree(&outbuf);
778
					}
779
					RingBufWrite(&outbuf, bp, rd);
780
					sem_post(&output_sem);
781
782
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
				}
			} 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);
809
810
				avail=RingBufFree(&outbuf)/2;	// leave room for wwiv/telnet expansion
#if 0
811
				if(avail==0) 
812
					lprintf("Node %d !output buffer full (%u bytes)"
813
						,cfg.node_num,RingBufFull(&outbuf));
814
#endif
815

816
817
				if(len>avail)
            		len=avail;
818
				if(len) {
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
					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

837
					if(mode&EX_WWIV) {
838
                		bp=wwiv_expand(buf, rd, wwiv_buf, rd, useron.misc, wwiv_flag);
839
840
841
						if(rd>sizeof(wwiv_buf))
							errorlog("WWIV_BUF OVERRUN");
					} else {
842
                		bp=telnet_expand(buf, rd, telnet_buf, rd);
843
844
845
846
847
848
849
						if(rd>sizeof(telnet_buf))
							errorlog("TELNET_BUF OVERRUN");
					}
					if(rd>RingBufFree(&outbuf)) {
						errorlog("output buffer overflow");
						rd=RingBufFree(&outbuf);
					}
850
					RingBufWrite(&outbuf, bp, rd);
851
					sem_post(&output_sem);
852
853
854
				}
			}
            if(!rd && !wr) {
855
				if(hungup || ++loop_since_io>=1000) {
856
857
858
859
860
	                if(GetExitCodeProcess(process_info.hProcess, &retval)==FALSE) {
	                    errormsg(WHERE, ERR_CHK, "ExitCodeProcess"
						,(DWORD)process_info.hProcess);
						break;
					}
861
					if(retval!=STILL_ACTIVE)
862
	                    break;
863

864
					if(!(loop_since_io%3000)) {
865
866
867
868
						OutputDebugString(".");

						// Let's make sure the socket is up
						// Sending will trigger a socket d/c detection
869
870
						if(!(startup->options&BBS_OPT_NO_TELNET_GA))
							send_telnet_cmd(TELNET_GA,0);
871
872

						// Check if the node has been interrupted
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
						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);
		}
	}

899
    if(!(mode&EX_BG)) {			/* !background execution */
900

901
902
		if(retval==STILL_ACTIVE) {
			lprintf("Node %d Terminating process from line %d",cfg.node_num,__LINE__);
903
			TerminateProcess(process_info.hProcess, GetLastError());
904
		}	
905

906
	 	// Get return value
907
908
909
910
911
912
913
914
    	sprintf(str,"%sDOSXTRN.RET", cfg.node_dir);
        FILE* fp=fopen(str,"r");
        if(fp!=NULL) {
			fscanf(fp,"%d",&retval);
			fclose(fp);
		}
	}

915
	XTRN_CLEANUP;
916
	CloseHandle(process_info.hProcess);
917
918
919

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

920
921
922
		if(native) {
			ulong l=0;
			ioctlsocket(client_socket, FIONBIO, &l);
923
			if(input_thread_mutex_locked && input_thread_running) {
924
925
926
				pthread_mutex_unlock(&input_thread_mutex);
				input_thread_mutex_locked=false;
			}
927
		}
928

929
930
		curatr=~0;			// Can't guarantee current attributes
		attr(LIGHTGRAY);	// Force to "normal"
931

932
		rio_abortable=rio_abortable_save;	// Restore abortable state
933

934
		/* Got back to Text/NVT mode */
935
936
937
938
		if(telnet_mode&TELNET_MODE_BIN_RX) {
			send_telnet_cmd(TELNET_DONT,TELNET_BINARY);
			telnet_mode&=~TELNET_MODE_BIN_RX;
		}
939
	}
940

941
942
//	lprintf("%s returned %d",realcmdline, retval);

943
944
	errorlevel = retval; // Baja-retrievable error value

945
946
947
	return(retval);
}

948
949
#else	/* !WIN32 */

950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
/*****************************************************************************/
// 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);
}

966
967
#define MAX_ARGS 1000

968
969
970
971
972
973
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
#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(const char* cmdline, long mode, const char* startup_dir)
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{
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	char	str[MAX_PATH+1];
	char	fname[MAX_PATH+1];
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	char	fullpath[MAX_PATH+1];
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	char	fullcmdline[MAX_PATH+1];
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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=rio_abortable;
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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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	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 fname to program name only */
	truncstr(str," ");
    SAFECOPY(fname,getfname(str));
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    for(i=0;i<cfg.total_natvpgms;i++)
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        if(!stricmp(fname,cfg.natvpgm[i]->name))
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            break;
    if(i<cfg.total_natvpgms || mode&EX_NATIVE)
        native=true;

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	sprintf(fullpath,"%s%s",startup_dir,fname);
	if(startup_dir!=NULL && cmdline[0]!='/' && cmdline[0]!='.' && fexist(fullpath))
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		sprintf(fullcmdline,"%s%s",startup_dir,cmdline);
	else
		SAFECOPY(fullcmdline,cmdline);
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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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#if defined(__FreeBSD__)
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		/* 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);
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		SAFECOPY(str,fullcmdline);
		sprintf(fullcmdline,"%s -F %s",startup->dosemu_path,str);
#else
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		bprintf("\r\nExternal DOS programs are not yet supported in \r\n%s\r\n"
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			,VERSION_NOTICE);
		return(-1);
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#endif
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	}

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	if(!(mode&EX_INR) && input_thread_running)
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		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);
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			errormsg(WHERE,ERR_EXEC,fullcmdline,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);
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			errormsg(WHERE,ERR_EXEC,fullcmdline,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];
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			if(useron.misc&ANSI)
				sprintf(term_env,"TERM=%s",startup->xtrn_term_ansi);
			else
				sprintf(term_env,"TERM=%s",startup->xtrn_term_dumb);
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			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(fullcmdline,"<>|;\"")!=strlen(fullcmdline)) {
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			argv[0]=comspec;
			argv[1]="-c";
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			argv[2]=fullcmdline;
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			argv[3]=NULL;
		} else {
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			argv[0]=fullcmdline;	/* point to the beginning of the string */
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			argc=1;
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			for(i=0;fullcmdline[i] && argc<MAX_ARGS;i++)	/* Break up command line */
				if(fullcmdline[i]==SP) {
					fullcmdline[i]=0;			/* insert nulls */
					argv[argc++]=fullcmdline+i+1; /* point to the beginning of the next arg */
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				}
			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,fullcmdline);
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	/* Disable Ctrl-C checking */
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	if(!(mode&EX_OFFLINE))
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		rio_abortable=false;