xtrn.cpp 61 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(__DARWIN__)
	#include <util.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)
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		eprintf(LOG_INFO,"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
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				,sizeof(buf)/2			// Maximum message size (0=unlimited)
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				,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
				)) {
513
				XTRN_CLEANUP;
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
				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;
	}
535
    if(startup->options&BBS_OPT_XTRN_MINIMIZED) {
536
537
538
    	startup_info.wShowWindow=SW_SHOWMINNOACTIVE;
        startup_info.dwFlags|=STARTF_USESHOWWINDOW;
    }
539
540
541
542
543
544
545
546
	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;

547
548
		// Create the child output pipe (override default 4K buffer size)
		if(!CreatePipe(&rdoutpipe,&startup_info.hStdOutput,&sa,sizeof(buf))) {
549
550
551
552
553
554
			errormsg(WHERE,ERR_CREATE,"stdout pipe",0);
			return(GetLastError());
		}
		startup_info.hStdError=startup_info.hStdOutput;

		// Create the child input pipe.
555
		if(!CreatePipe(&startup_info.hStdInput,&wrinpipe,&sa,sizeof(buf))) {
556
557
558
			errormsg(WHERE,ERR_CREATE,"stdin pipe",0);
			return(GetLastError());
		}
559

560
561
562
563
564
565
566
567
568
569
570
571
572
573
		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;
	}
574
	if(native && !(mode&EX_OFFLINE)) {
575

576
		if(!(mode&EX_INR) && input_thread_running) {
577
			pthread_mutex_lock(&input_thread_mutex);
578
579
			input_thread_mutex_locked=true;
		}
580
581
582
583
584
585

		if(!(mode&EX_OUTR)) {	 /* Native Socket I/O program */
			/* Enable the Nagle algorithm */
			BOOL nodelay=FALSE;
			setsockopt(client_socket,IPPROTO_TCP,TCP_NODELAY,(char*)&nodelay,sizeof(nodelay));
		}
586
587
588
589
590
591
592
	}

    if(!CreateProcess(
		NULL,			// pointer to name of executable module
		fullcmdline,  	// pointer to command line string
		NULL,  			// process security attributes
		NULL,   		// thread security attributes
593
		native && !(mode&EX_OFFLINE),	 			// handle inheritance flag
594
		CREATE_NEW_CONSOLE/*|CREATE_SEPARATE_WOW_VDM*/, // creation flags
595
596
597
598
599
        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
		)) {
600
		XTRN_CLEANUP;
601
		if(input_thread_mutex_locked && input_thread_running) {
602
603
604
			pthread_mutex_unlock(&input_thread_mutex);
			input_thread_mutex_locked=false;
		}
605
		SetLastError(last_error);	/* Restore LastError */
606
607
608
609
        errormsg(WHERE, ERR_EXEC, realcmdline, mode);
        return(GetLastError());
    }

610
611
612
613
614
615
616
617
618
619
620
#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

621
622
	CloseHandle(process_info.hThread);

623
624
625
626
627
	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) {
628
				XTRN_CLEANUP;
629
                TerminateProcess(process_info.hProcess, __LINE__);
630
				CloseHandle(process_info.hProcess);
631
632
633
634
635
				errormsg(WHERE, ERR_TIMEOUT, "start_event", retval);
				return(GetLastError());
			}

			CloseHandle(start_event);
636
			start_event=NULL;	/* Mark as closed */
637
638
639
640
641
642
643
644
645
646
647

			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
				)) {
648
				XTRN_CLEANUP;
649
                TerminateProcess(process_info.hProcess, __LINE__);
650
				CloseHandle(process_info.hProcess);
651
652
653
654
655
				errormsg(WHERE, ERR_IOCTL, SBBSEXEC_VXD, SBBSEXEC_IOCTL_COMPLETE);
				return(GetLastError());
			}
		}
	}
656
    ReleaseMutex(exec_mutex);
657

658
	/* Disable Ctrl-C checking */
659
	if(!(mode&EX_OFFLINE))
660
		rio_abortable=false;
661

662
    // Executing app in foreground?, monitor
663
    retval=STILL_ACTIVE;
664
    while(!(mode&EX_BG)) {
665
666
		if(mode&EX_CHKTIME)
			gettimeleft();
667
668
        if(!online && !(mode&EX_OFFLINE)) { // Tell VXD/VDD and external that user hung-up
        	if(was_online) {
669
670
				sprintf(str,"%s hung-up in external program",useron.alias);
				logline("X!",str);
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
            	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;
            }
691
            if(hungup && time(NULL)-hungup>5 && !processTerminated) {
692
				lprintf(LOG_INFO,"Node %d Terminating process from line %d",cfg.node_num,__LINE__);
693
694
				processTerminated=TerminateProcess(process_info.hProcess, 2112);
			}
695
        }
696
697
		if((native && !use_pipes) || mode&EX_OFFLINE) {	
			/* Monitor for process termination only */
698
699
			if(WaitForSingleObject(process_info.hProcess,1000)==WAIT_OBJECT_0)
				break;
700
701
		} else {

702
			if(nt || use_pipes) {	// Windows NT/2000
703
704
705
706
707

				/* Write to VDD */

				wr=RingBufPeek(&inbuf,buf,sizeof(buf));
				if(wr) {
708
					if(!use_pipes && wrslot==INVALID_HANDLE_VALUE) {
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
						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
					}
725
					
726
727
728
729
730
					/* CR expansion */
					if(use_pipes) 
						bp=cr_expand(buf,wr,output_buf,wr);
					else
						bp=buf;
731

732
					if(wrslot!=INVALID_HANDLE_VALUE
733
						&& WriteFile(wrslot,bp,wr,&len,NULL)==TRUE) {
734
735
						RingBufRead(&inbuf, NULL, len);
						wr=len;
736
737
						if(use_pipes) {
							/* echo */
738
							RingBufWrite(&outbuf, bp, wr);
739
						}
740
741
742
743
744
745
					} else		// VDD not loaded yet
						wr=0;
				}

				/* Read from VDD */

746
				rd=0;
747
				len=sizeof(buf);
748
				avail=RingBufFree(&outbuf)/2;	// leave room for wwiv/telnet expansion
749
#if 0
750
				if(avail==0)
751
					lprintf("Node %d !output buffer full (%u bytes)"
752
						,cfg.node_num,RingBufFull(&outbuf));
753
#endif
754
755
				if(len>avail)
            		len=avail;
756

757
				while(rd<len) {
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
					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) {
785
786
787
788
					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");
789
790
					} else if(telnet_mode&TELNET_MODE_OFF) {
						bp=buf;
791
					} else {
792
                		bp=telnet_expand(buf, rd, telnet_buf, rd);
793
794
795
						if(rd>sizeof(telnet_buf))
							errorlog("TELNET_BUF OVERRUN");
					}
796
797
798
					if(rd>RingBufFree(&outbuf)) {
						errorlog("output buffer overflow");
						rd=RingBufFree(&outbuf);
799
					}
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
					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);
829
830
				avail=RingBufFree(&outbuf)/2;	// leave room for wwiv/telnet expansion
#if 0
831
				if(avail==0) 
832
					lprintf("Node %d !output buffer full (%u bytes)"
833
						,cfg.node_num,RingBufFull(&outbuf));
834
#endif
835

836
837
				if(len>avail)
            		len=avail;
838
				if(len) {
839
840
841
842
843
844
845
846
847
848
849
850
851
					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;
					}
852
					if(mode&EX_WWIV) {
853
                		bp=wwiv_expand(buf, rd, wwiv_buf, rd, useron.misc, wwiv_flag);
854
855
						if(rd>sizeof(wwiv_buf))
							errorlog("WWIV_BUF OVERRUN");
856
857
					} else if(telnet_mode&TELNET_MODE_OFF) {
						bp=buf;
858
					} else {
859
                		bp=telnet_expand(buf, rd, telnet_buf, rd);
860
861
862
863
864
865
866
						if(rd>sizeof(telnet_buf))
							errorlog("TELNET_BUF OVERRUN");
					}
					if(rd>RingBufFree(&outbuf)) {
						errorlog("output buffer overflow");
						rd=RingBufFree(&outbuf);
					}
867
868
869
					RingBufWrite(&outbuf, bp, rd);
				}
			}
870
#if defined(_DEBUG) && 0
871
872
873
874
875
876
			if(rd>1) {
				sprintf(str,"Node %d read %5d bytes from xtrn", cfg.node_num, rd);
				OutputDebugString(str);
			}
#endif
            if((!rd && !wr) || hungup) {
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894

				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 */
895
				if((loop_since_io%300)==0) {
896
#if defined(_DEBUG)
897
898
899
900
901
902
903
					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);
904
				}
905
				sem_trywait_block(&inbuf.sem,100);
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
            } 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);
		}
	}

926
    if(!(mode&EX_BG)) {			/* !background execution */
927

928
929
930
        if(GetExitCodeProcess(process_info.hProcess, &retval)==FALSE)
            errormsg(WHERE, ERR_CHK, "ExitCodeProcess",(DWORD)process_info.hProcess);

931
		if(retval==STILL_ACTIVE) {
932
			lprintf(LOG_INFO,"Node %d Terminating process from line %d",cfg.node_num,__LINE__);
933
			TerminateProcess(process_info.hProcess, GetLastError());
934
		}	
935

936
	 	// Get return value
937
938
939
940
941
942
943
		if(!native) {
    		sprintf(str,"%sDOSXTRN.RET", cfg.node_dir);
			FILE* fp=fopen(str,"r");
			if(fp!=NULL) {
				fscanf(fp,"%d",&retval);
				fclose(fp);
			}
944
945
946
		}
	}

947
	XTRN_CLEANUP;
948
	CloseHandle(process_info.hProcess);
949
950
951

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

952
		if(native) {
953
954
			
			/* Re-enable blocking (incase disabled by xtrn program) */
955
956
			ulong l=0;
			ioctlsocket(client_socket, FIONBIO, &l);
957
958
959
960
961

			/* Re-set socket options */
			if(set_socket_options(&cfg, client_socket, str))
				lprintf(LOG_ERR,"%04d !ERROR %s",client_socket, str);

962
			if(input_thread_mutex_locked && input_thread_running) {
963
964
965
				pthread_mutex_unlock(&input_thread_mutex);
				input_thread_mutex_locked=false;
			}
966
		}
967

968
969
		curatr=~0;			// Can't guarantee current attributes
		attr(LIGHTGRAY);	// Force to "normal"
970

971
		rio_abortable=rio_abortable_save;	// Restore abortable state
972

973
		/* Got back to Text/NVT mode */
974
975
976
977
		if(telnet_mode&TELNET_MODE_BIN_RX) {
			send_telnet_cmd(TELNET_DONT,TELNET_BINARY);
			telnet_mode&=~TELNET_MODE_BIN_RX;
		}
978
	}
979

980
981
//	lprintf("%s returned %d",realcmdline, retval);

982
983
	errorlevel = retval; // Baja-retrievable error value

984
985
986
	return(retval);
}

987
988
#else	/* !WIN32 */

989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
/*****************************************************************************/
// 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);
}

1005
1006
#define MAX_ARGS 1000

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
1073
#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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	bool	data_waiting;
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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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	int		err_pipe[2];
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	fd_set ibits;
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	int	high_fd;
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	struct timeval timeout;
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	if(online==ON_LOCAL)
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		eprintf(LOG_INFO,"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);
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#elif defined(__linux__) && defined(USE_DOSEMU)

		/* dosemu integration  --  Ryan Underwood, <nemesis @ icequake.net> */

		FILE *dosemubat;
		int setup_override;
		char tok[MAX_PATH+1];
 
		char dosemuconf[MAX_PATH+1];
		char dosemubinloc[MAX_PATH+1];
		char virtualconf[75];
		char dosterm[15];
		char log_external[MAX_PATH+1];

		/*  on the Unix side. xtrndir is the parent of the door's startup dir. */
		char xtrndir[MAX_PATH+1];

		/*  on the DOS side.  */
		char xtrndir_dos[MAX_PATH+1];
		char ctrldir_dos[MAX_PATH+1];
		char datadir_dos[MAX_PATH+1];
		char execdir_dos[MAX_PATH+1];

		/* Default locations that can be overridden by 
		 * the sysop in emusetup.bat */

		const char nodedrive[] = "D:";
		const char xtrndrive[] = "E:";
		const char ctrldrive[] = "F:";
		const char datadrive[] = "G:";
		const char execdrive[] = "H:";

		SAFECOPY(str,startup_dir);
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		if(*(p=lastchar(str))=='/')		/* kill trailing slash */
			*p=0;
		if((p=strrchr(str,'/'))!=NULL)  /* kill the last element of the path */
			*p=0;
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		SAFECOPY(xtrndir,str);

		/* construct DOS equivalents for the unix directories */

		SAFECOPY(ctrldir_dos,cfg.ctrl_dir);
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		REPLACE_CHARS(ctrldir_dos,'/','\\',p);
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		p=lastchar(ctrldir_dos);
		if (*p=='\\') *p=0;

		SAFECOPY(datadir_dos,cfg.data_dir);
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		REPLACE_CHARS(datadir_dos,'/','\\',p);
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		p=lastchar(datadir_dos);
		if (*p=='\\') *p=0;

		SAFECOPY(execdir_dos,cfg.exec_dir);
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		REPLACE_CHARS(execdir_dos,'/','\\',p);
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		p=lastchar(execdir_dos);
		if (*p=='\\') *p=0;

		SAFECOPY(xtrndir_dos,xtrndir);
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		REPLACE_CHARS(xtrndir_dos,'/','\\',p);
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		/* check for existence of a dosemu.conf in the door directory.
		 * It is a good idea to be able to use separate configs for each
		 * door. */

		sprintf(str,"%sdosemu.conf",startup_dir);
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		if (!fexist(str)) {
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		/* If we can't find it in the door dir, look for a global one
		 * in the ctrl dir. */

			sprintf(str,"%sdosemu.conf",cfg.ctrl_dir);
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			if (!fexist(str)) {
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		/* If we couldn't find either, try for the system one, then
		 * error out. */
				SAFECOPY(str,"/etc/dosemu/dosemu.conf");
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				if (!fexist(str)) {
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					SAFECOPY(str,"/etc/dosemu.conf");
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					if (!fexist(str)) {
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						errormsg(WHERE,ERR_READ,str,0);
						return(-1);
					}
					else SAFECOPY(dosemuconf,str);  /* using system conf */
				}
				else SAFECOPY(dosemuconf,str);  /* using system conf */
			}
			else SAFECOPY(dosemuconf,str);   /* using global conf */
		}
		else SAFECOPY(dosemuconf,str);  /* using door-specific conf */

		/* same deal for emusetup.bat. */

		sprintf(str,"%semusetup.bat",startup_dir);
		fprintf(stderr, str);
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		if (!fexist(str)) {
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		/* If we can't find it in the door dir, look for a global one
		 * in the ctrl dir. */

			sprintf(str,"%semusetup.bat",cfg.ctrl_dir);
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			if (!fexist(str)) {
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