tn3270.cc

这是关于远程登陆TELNET 的源代码 已经测试过的。

/*
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * From: @(#)tn3270.c	5.2 (Berkeley) 3/1/91
 */
char tn3270_rcsid[] = 
  "$Id: tn3270.cc,v 1.9 1996/08/13 09:08:34 dholland Exp $";

#include <sys/types.h>
#include <arpa/telnet.h>

#include "defines.h"
#include "ring.h"
#include "externs.h"
#include "proto.h"

#if defined(TN3270)

#include "../tn3270/ctlr/screen.h"
#include "../tn3270/general/globals.h"

#include "../tn3270/telextrn.h"
#include "../tn3270/ctlr/externs.h"

int HaveInput;		/* There is input available to scan */
int cursesdata;		/* Do we dump curses data? */
int sigiocount;		/* Number of times we got a SIGIO */

char tline[200];
char *transcom = 0;	/* transparent mode command (default: none) */

char Ibuf[8*BUFSIZ], *Ifrontp, *Ibackp;

static char sb_terminal[] = { IAC, SB,
			      TELOPT_TTYPE, TELQUAL_IS,
			      'I', 'B', 'M', '-', '3', '2', '7', '8', '-', '2',
			      IAC, SE };
#define	SBTERMMODEL	13

static int Sent3270TerminalType;	/* Have we said we are a 3270? */

#endif	/* defined(TN3270) */


void init_3270(void) {
#if defined(TN3270)
    HaveInput = 0;
    sigiocount = 0;
    Sent3270TerminalType = 0;
    Ifrontp = Ibackp = Ibuf;
    init_ctlr();		/* Initialize some things */
    init_keyboard();
    init_screen();
    init_system();
#endif	/* TN3270 */
}

#if defined(TN3270)

/*
 * DataToNetwork - queue up some data to go to network.  If "done" is set,
 * then when last byte is queued, we add on an IAC EOR sequence (so,
 * don't call us with "done" until you want that done...)
 *
 * We actually do send all the data to the network buffer, since our
 * only client needs for us to do that.
 */

/*
 * buffer:	where the data is
 * count:	how much to send
 * done:	is this the last of a logical block
 */
int DataToNetwork(char *buffer, int count, int done) {
    register int loop, c;
    int origCount;
    
    origCount = count;

    while (count) {
	/* If not enough room for EORs, IACs, etc., wait */
	if (NETROOM() < 6) {
	    fd_set o;
	    
	    FD_ZERO(&o);
	    netflush();
	    while (NETROOM() < 6) {
		FD_SET(net, &o);
		select(net+1, (fd_set *) 0, &o, (fd_set *) 0,
		       (struct timeval *) 0);
		netflush();
	    }
	}
	c = ring_empty_count(&netoring);
	if (c > count) {
	    c = count;
	}
	loop = c;
	while (loop) {
	    if (((unsigned char)*buffer) == IAC) {
		break;
	    }
	    buffer++;
	    loop--;
	}
	if ((c = c-loop)) {
	    netoring.supply_data(buffer-c, c);
	    count -= c;
	}
	if (loop) {
	    NET2ADD(IAC, IAC);
	    count--;
	    buffer++;
	}
    }
    
    if (done) {
	NET2ADD(IAC, EOR);
	netflush();		/* try to move along as quickly as ... */
    }
    return(origCount - count);
}

void inputAvailable(void) {
    HaveInput = 1;
    sigiocount++;
}

void outputPurge(void) {
    ttyflush(1);
}


/*
 * The following routines are places where the various tn3270
 * routines make calls into telnet.c.
 */

/*
 * DataToTerminal - queue up some data to go to terminal.
 *
 * Note: there are people who call us and depend on our processing
 * *all* the data at one time (thus the select).
 */

/*
 * buffer:	where the data is
 * count:	how much to send
 */
int DataToTerminal(char *buffer, int count) {
    register int c;
    int origCount;

    origCount = count;

    while (count) {
	if (TTYROOM() == 0) {

	    fd_set o;
	    FD_ZERO(&o);
	    ttyflush(0);
	    while (TTYROOM() == 0) {
		FD_SET(tout, &o);
		select(tout+1, NULL, &o, NULL, NULL);
		ttyflush(0);
	    }
	}
	c = TTYROOM();
	if (c > count) {
	    c = count;
	}
	ttyoring.supply_data(buffer, c);
	count -= c;
	buffer += c;
    }
    return origCount;
}


/*
 * Push3270 - Try to send data along the 3270 output (to screen) direction.
 */
int Push3270(void) {
    int save = ring_full_count(&netiring);

    if (save) {
	if (Ifrontp+save > Ibuf+sizeof Ibuf) {
	    if (Ibackp != Ibuf) {
		memcpy(Ibuf, Ibackp, Ifrontp-Ibackp);
		Ifrontp -= (Ibackp-Ibuf);
		Ibackp = Ibuf;
	    }
	}
	if (Ifrontp+save < Ibuf+sizeof Ibuf) {
	    (void)telrcv();
	}
    }
    return save != ring_full_count(&netiring);
}


/*
 * Finish3270 - get the last dregs of 3270 data out to the terminal
 *		before quitting.
 */
void Finish3270(void) {
    while (Push3270() || !DoTerminalOutput()) {
	HaveInput = 0;
    }
}


/* StringToTerminal - output a null terminated string to the terminal */
void StringToTerminal(char *s) {
    int count = strlen(s);
    if (count) {
	DataToTerminal(s, count);	/* we know it always goes... */
    }
}


#if ((!defined(NOT43)) || defined(PUTCHAR))
/* _putchar - output a single character to the terminal.  This name is so that
 *	curses(3x) can call us to send out data.
 */

void _putchar(char c) {
#if defined(sun)		/* SunOS 4.0 bug */
    c &= 0x7f;
#endif
    if (cursesdata) {
	Dump('>', &c, 1);
    }
    if (!TTYROOM()) {
	DataToTerminal(&c, 1);
    } 
    else {
	TTYADD(c);
    }
}
#endif	/* ((!defined(NOT43)) || defined(PUTCHAR)) */

void SetIn3270(void) {
    if (Sent3270TerminalType && my_want_state_is_will(TELOPT_BINARY)
	&& my_want_state_is_do(TELOPT_BINARY) && !donebinarytoggle) 
    {
	if (!In3270) {
	    In3270 = 1;
	    Init3270();		/* Initialize 3270 functions */
	    /* initialize terminal key mapping */
	    InitTerminal();	/* Start terminal going */
	    setconnmode(0);
	}
    } 
    else {
	if (In3270) {
	    StopScreen(1);
	    In3270 = 0;
	    Stop3270();		/* Tell 3270 we aren't here anymore */
	    setconnmode(0);
	}
    }
}

/*
 * tn3270_ttype()
 *
 *	Send a response to a terminal type negotiation.
 *
 *	Return '0' if no more responses to send; '1' if a response sent.
 */

int tn3270_ttype(void) {
    /*
     * Try to send a 3270 type terminal name.  Decide which one based
     * on the format of our screen, and (in the future) color
     * capaiblities.
     */
    InitTerminal();		/* Sets MaxNumberColumns, MaxNumberLines */
    if ((MaxNumberLines >= 24) && (MaxNumberColumns >= 80)) {
	Sent3270TerminalType = 1;
	if ((MaxNumberLines >= 27) && (MaxNumberColumns >= 132)) {
	    MaxNumberLines = 27;
	    MaxNumberColumns = 132;
	    sb_terminal[SBTERMMODEL] = '5';
	} 
	else if (MaxNumberLines >= 43) {
	    MaxNumberLines = 43;
	    MaxNumberColumns = 80;
	    sb_terminal[SBTERMMODEL] = '4';
	} 
	else if (MaxNumberLines >= 32) {
	    MaxNumberLines = 32;
	    MaxNumberColumns = 80;
	    sb_terminal[SBTERMMODEL] = '3';
	} 
	else {
	    MaxNumberLines = 24;
	    MaxNumberColumns = 80;
	    sb_terminal[SBTERMMODEL] = '2';
	}
	NumberLines = 24;		/* before we start out... */
	NumberColumns = 80;
	ScreenSize = NumberLines*NumberColumns;
	if ((MaxNumberLines*MaxNumberColumns) > MAXSCREENSIZE) {
	    ExitString("Programming error:  MAXSCREENSIZE too small.\n",
								1);
	    /*NOTREACHED*/
	}
	printsub('>', sb_terminal+2, sizeof sb_terminal-2);
	netoring.supply_data(sb_terminal, sizeof(sb_terminal));
	return 1;
    } 
    else {
	return 0;
    }
}

int settranscom(int argc, char *argv[]) {
    int i;
    if (argc == 1 && transcom) {
	transcom = 0;
    }
    if (argc == 1) {
	return;
    }
    transcom = tline;
    strcpy(transcom, argv[1]);
    for (i = 2; i < argc; ++i) {
	strcat(transcom, " ");
	strcat(transcom, argv[i]);
    }
}

#endif	/* defined(TN3270) */