xtrn.cpp 51.5 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)		*
 *																			*
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 * Copyright 2003 Rob Swindell - http://www.synchro.net/copyright.html		*
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 *																			*
 * 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>
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#elif defined(__QNX__)
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#if 0
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	#include <unix.h>
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#else
	#define NEEDS_FORKPTY
#endif
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#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(__QNX__)
	/*
	 * Control Character Defaults
	 */
	#define CTRL(x)	(x&037)
	#define	CEOF		CTRL('d')
	#define	CEOL		0xff		/* XXX avoid _POSIX_VDISABLE */
	#define	CERASE		0177
	#define	CERASE2		CTRL('h')
	#define	CINTR		CTRL('c')
	#define	CSTATUS		CTRL('t')
	#define	CKILL		CTRL('u')
	#define	CMIN		1
	#define	CQUIT		034		/* FS, ^\ */
	#define	CSUSP		CTRL('z')
	#define	CTIME		0
	#define	CDSUSP		CTRL('y')
	#define	CSTART		CTRL('q')
	#define	CSTOP		CTRL('s')
	#define	CLNEXT		CTRL('v')
	#define	CDISCARD 	CTRL('o')
	#define	CWERASE 	CTRL('w')
	#define	CREPRINT 	CTRL('r')
	#define	CEOT		CEOF
	/* compat */
	#define	CBRK		CEOL
	#define CRPRNT		CREPRINT
	#define	CFLUSH		CDISCARD
#endif

#if defined(__solaris__) || defined(__QNX__)
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	#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__ */

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#define XTRN_IO_BUF_LEN 10000	/* 50% of IO_THREAD_BUF_SIZE */
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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, str, 0);
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				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;
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
				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;
	}
533
    if(startup->options&BBS_OPT_XTRN_MINIMIZED) {
534
535
536
    	startup_info.wShowWindow=SW_SHOWMINNOACTIVE;
        startup_info.dwFlags|=STARTF_USESHOWWINDOW;
    }
537
538
539
540
541
542
543
544
	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;

545
546
		// Create the child output pipe (override default 4K buffer size)
		if(!CreatePipe(&rdoutpipe,&startup_info.hStdOutput,&sa,sizeof(buf))) {
547
548
549
550
551
552
			errormsg(WHERE,ERR_CREATE,"stdout pipe",0);
			return(GetLastError());
		}
		startup_info.hStdError=startup_info.hStdOutput;

		// Create the child input pipe.
553
		if(!CreatePipe(&startup_info.hStdInput,&wrinpipe,&sa,sizeof(buf))) {
554
555
556
			errormsg(WHERE,ERR_CREATE,"stdin pipe",0);
			return(GetLastError());
		}
557

558
559
560
561
562
563
564
565
566
567
568
569
570
571
		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;
	}
572
	if(native && !(mode&EX_OFFLINE)) {
573
		/* temporary */
574
575
576
		FILE* fp;
		sprintf(fname,"%sDOOR32.SYS",cfg.node_dir);
		fp=fopen(fname,"wb");
577
		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"
578
			"%d\r\n%d\r\n"
579
580
			,mode&EX_OUTR ? 0 /* Local */ : 2 /* Telnet */
			,mode&EX_OUTR ? INVALID_SOCKET : client_socket_dup
581
			,VERSION_NOTICE,REVISION
582
583
584
585
586
587
588
589
			,useron.number
			,useron.name
			,useron.alias
			,useron.level
			,timeleft/60
			,useron.misc&ANSI ? 1 : 0
			,cfg.node_num);
		fclose(fp);
590
591

		/* not temporary */
592
		if(!(mode&EX_INR) && input_thread_running) {
593
			pthread_mutex_lock(&input_thread_mutex);
594
595
			input_thread_mutex_locked=true;
		}
596
597
598
599
600
601
602
	}

    if(!CreateProcess(
		NULL,			// pointer to name of executable module
		fullcmdline,  	// pointer to command line string
		NULL,  			// process security attributes
		NULL,   		// thread security attributes
603
		native && !(mode&EX_OFFLINE),	 			// handle inheritance flag
604
		CREATE_NEW_CONSOLE/*|CREATE_SEPARATE_WOW_VDM*/, // creation flags
605
606
607
608
609
        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
		)) {
610
		XTRN_CLEANUP;
611
		if(input_thread_mutex_locked && input_thread_running) {
612
613
614
			pthread_mutex_unlock(&input_thread_mutex);
			input_thread_mutex_locked=false;
		}
615
		SetLastError(last_error);	/* Restore LastError */
616
617
618
619
        errormsg(WHERE, ERR_EXEC, realcmdline, mode);
        return(GetLastError());
    }

620
621
622
623
624
625
626
627
628
629
630
#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

631
632
	CloseHandle(process_info.hThread);

633
634
635
636
637
	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) {
638
				XTRN_CLEANUP;
639
                TerminateProcess(process_info.hProcess, __LINE__);
640
				CloseHandle(process_info.hProcess);
641
642
643
644
645
				errormsg(WHERE, ERR_TIMEOUT, "start_event", retval);
				return(GetLastError());
			}

			CloseHandle(start_event);
646
			start_event=NULL;	/* Mark as closed */
647
648
649
650
651
652
653
654
655
656
657

			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
				)) {
658
				XTRN_CLEANUP;
659
                TerminateProcess(process_info.hProcess, __LINE__);
660
				CloseHandle(process_info.hProcess);
661
662
663
664
665
				errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_COMPLETE);
				return(GetLastError());
			}
		}
	}
666
    ReleaseMutex(exec_mutex);
667

668
	/* Disable Ctrl-C checking */
669
	if(!(mode&EX_OFFLINE))
670
		rio_abortable=false;
671

672
    // Executing app in foreground?, monitor
673
    retval=STILL_ACTIVE;
674
    while(!(mode&EX_BG)) {
675
676
		if(mode&EX_CHKTIME)
			gettimeleft();
677
678
        if(!online && !(mode&EX_OFFLINE)) { // Tell VXD/VDD and external that user hung-up
        	if(was_online) {
679
680
				sprintf(str,"%s hung-up in external program",useron.alias);
				logline("X!",str);
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
            	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;
            }
701
702
703
704
            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);
			}
705
        }
706
707
		if((native && !use_pipes) || mode&EX_OFFLINE) {	
			/* Monitor for process termination only */
708
709
			if(WaitForSingleObject(process_info.hProcess,1000)==WAIT_OBJECT_0)
				break;
710
711
		} else {

712
			if(nt || use_pipes) {	// Windows NT/2000
713
714
715
716
717

				/* Write to VDD */

				wr=RingBufPeek(&inbuf,buf,sizeof(buf));
				if(wr) {
718
					if(!use_pipes && wrslot==INVALID_HANDLE_VALUE) {
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
						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
					}
735
					
736
737
738
739
740
					/* CR expansion */
					if(use_pipes) 
						bp=cr_expand(buf,wr,output_buf,wr);
					else
						bp=buf;
741

742
					if(wrslot!=INVALID_HANDLE_VALUE
743
						&& WriteFile(wrslot,bp,wr,&len,NULL)==TRUE) {
744
745
						RingBufRead(&inbuf, NULL, len);
						wr=len;
746
747
						if(use_pipes) {
							/* echo */
748
							RingBufWrite(&outbuf, bp, wr);
749
						}
750
751
752
753
754
755
					} else		// VDD not loaded yet
						wr=0;
				}

				/* Read from VDD */

756
				rd=0;
757
				len=sizeof(buf);
758
				avail=RingBufFree(&outbuf)/2;	// leave room for wwiv/telnet expansion
759
#if 0
760
				if(avail==0)
761
					lprintf("Node %d !output buffer full (%u bytes)"
762
						,cfg.node_num,RingBufFull(&outbuf));
763
#endif
764
765
				if(len>avail)
            		len=avail;
766

767
				while(rd<len) {
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
					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) {
795
796
797
798
799
					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 {
800
                		bp=telnet_expand(buf, rd, telnet_buf, rd);
801
802
803
						if(rd>sizeof(telnet_buf))
							errorlog("TELNET_BUF OVERRUN");
					}
804
805
806
					if(rd>RingBufFree(&outbuf)) {
						errorlog("output buffer overflow");
						rd=RingBufFree(&outbuf);
807
					}
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
					RingBufWrite(&outbuf, bp, rd);
				}
			} 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);
837
838
				avail=RingBufFree(&outbuf)/2;	// leave room for wwiv/telnet expansion
#if 0
839
				if(avail==0) 
840
					lprintf("Node %d !output buffer full (%u bytes)"
841
						,cfg.node_num,RingBufFull(&outbuf));
842
#endif
843

844
845
				if(len>avail)
            		len=avail;
846
				if(len) {
847
848
849
850
851
852
853
854
855
856
857
858
859
					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;
					}
860
					if(mode&EX_WWIV) {
861
                		bp=wwiv_expand(buf, rd, wwiv_buf, rd, useron.misc, wwiv_flag);
862
863
864
						if(rd>sizeof(wwiv_buf))
							errorlog("WWIV_BUF OVERRUN");
					} else {
865
                		bp=telnet_expand(buf, rd, telnet_buf, rd);
866
867
868
869
870
871
872
						if(rd>sizeof(telnet_buf))
							errorlog("TELNET_BUF OVERRUN");
					}
					if(rd>RingBufFree(&outbuf)) {
						errorlog("output buffer overflow");
						rd=RingBufFree(&outbuf);
					}
873
874
875
					RingBufWrite(&outbuf, bp, rd);
				}
			}
876
877
878
879
880
881
882
#ifdef _DEBUG
			if(rd>1) {
				sprintf(str,"Node %d read %5d bytes from xtrn", cfg.node_num, rd);
				OutputDebugString(str);
			}
#endif
            if((!rd && !wr) || hungup) {
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900

				loop_since_io++;	/* number of loop iterations with no I/O */

				/* only check process termination after 300 milliseconds of no I/O */
				/* to allow for last minute reception of output from DOS programs */
				if(loop_since_io>=3
					&& WaitForSingleObject(process_info.hProcess,0)==WAIT_OBJECT_0)
					break;	/* Process Terminated */

				/* only check node for interrupt flag every 3 seconds of no I/O */
				if((loop_since_io%30)==0) {	
					// Check if the node has been interrupted
					getnodedat(cfg.node_num,&thisnode,0);
					if(thisnode.misc&NODE_INTR)
						break;
				}

				/* only send telnet GA every 30 seconds of no I/O */
901
902
903
904
905
906
907
908
909
				if((loop_since_io%300)==0) {
#ifdef _DEBUG
					sprintf(str,"Node %d xtrn idle\n",cfg.node_num);
					OutputDebugString(str);
#endif
					// Let's make sure the socket is up
					// Sending will trigger a socket d/c detection
					if(!(startup->options&BBS_OPT_NO_TELNET_GA))
						send_telnet_cmd(TELNET_GA,0);
910
				}
911
				sem_trywait_block(&inbuf.sem,100);
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
            } 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);
		}
	}

932
    if(!(mode&EX_BG)) {			/* !background execution */
933

934
935
936
        if(GetExitCodeProcess(process_info.hProcess, &retval)==FALSE)
            errormsg(WHERE, ERR_CHK, "ExitCodeProcess",(DWORD)process_info.hProcess);

937
938
		if(retval==STILL_ACTIVE) {
			lprintf("Node %d Terminating process from line %d",cfg.node_num,__LINE__);
939
			TerminateProcess(process_info.hProcess, GetLastError());
940
		}	
941

942
	 	// Get return value
943
944
945
946
947
948
949
		if(!native) {
    		sprintf(str,"%sDOSXTRN.RET", cfg.node_dir);
			FILE* fp=fopen(str,"r");
			if(fp!=NULL) {
				fscanf(fp,"%d",&retval);
				fclose(fp);
			}
950
951
952
		}
	}

953
	XTRN_CLEANUP;
954
	CloseHandle(process_info.hProcess);
955
956
957

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

958
959
960
		if(native) {
			ulong l=0;
			ioctlsocket(client_socket, FIONBIO, &l);
961
			if(input_thread_mutex_locked && input_thread_running) {
962
963
964
				pthread_mutex_unlock(&input_thread_mutex);
				input_thread_mutex_locked=false;
			}
965
		}
966

967
968
		curatr=~0;			// Can't guarantee current attributes
		attr(LIGHTGRAY);	// Force to "normal"
969

970
		rio_abortable=rio_abortable_save;	// Restore abortable state
971

972
		/* Got back to Text/NVT mode */
973
974
975
976
		if(telnet_mode&TELNET_MODE_BIN_RX) {
			send_telnet_cmd(TELNET_DONT,TELNET_BINARY);
			telnet_mode&=~TELNET_MODE_BIN_RX;
		}
977
	}
978

979
980
//	lprintf("%s returned %d",realcmdline, retval);

981
982
	errorlevel = retval; // Baja-retrievable error value

983
984
985
	return(retval);
}

986
987
#else	/* !WIN32 */

988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
/*****************************************************************************/
// 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);
}

1004
1005
#define MAX_ARGS 1000

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
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
#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);
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	switch (pid = FORK()) {
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	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));
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		cfsetispeed(&term,B19200);
		cfsetospeed(&term,B19200);
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		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);
			}


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		if((pid=FORK())==-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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	}
	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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