utilities.c

linux 下 telnet源码

/*
 * Copyright (c) 1988, 1993
 *	The 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.
 */

#ifndef lint
static char sccsid[] = "@(#)utilities.c	8.3 (Berkeley) 5/30/95";
#endif /* not lint */

#define	TELOPTS
#define	TELCMDS
#define	SLC_NAMES
#include <arpa/telnet.h>
#include <sys/types.h>
#include <sys/time.h>

#include <ctype.h>

#include "general.h"

#include "fdset.h"

#include "ring.h"

#include "defines.h"

#include "externs.h"

FILE	*NetTrace = 0;		/* Not in bss, since needs to stay */
int	prettydump;

/*
 * upcase()
 *
 *	Upcase (in place) the argument.
 */

    void
upcase(argument)
    register char *argument;
{
    register int c;

    while ((c = *argument) != 0) {
	if (islower(c)) {
	    *argument = toupper(c);
	}
	argument++;
    }
}

/*
 * SetSockOpt()
 *
 * Compensate for differences in 4.2 and 4.3 systems.
 */

    int
SetSockOpt(fd, level, option, yesno)
    int fd, level, option, yesno;
{
#ifndef	NOT43
    return setsockopt(fd, level, option,
				(char *)&yesno, sizeof yesno);
#else	/* NOT43 */
    if (yesno == 0) {		/* Can't do that in 4.2! */
	fprintf(stderr, "Error: attempt to turn off an option 0x%x.\n",
				option);
	return -1;
    }
    return setsockopt(fd, level, option, 0, 0);
#endif	/* NOT43 */
}

/*
 * The following are routines used to print out debugging information.
 */

unsigned char NetTraceFile[256] = "(standard output)";

    void
SetNetTrace(file)
    register char *file;
{
    if (NetTrace && NetTrace != stdout)
	fclose(NetTrace);
    if (file  && (strcmp(file, "-") != 0)) {
	NetTrace = fopen(file, "w");
	if (NetTrace) {
	    strcpy((char *)NetTraceFile, file);
	    return;
	}
	fprintf(stderr, "Cannot open %s.\n", file);
    }
    NetTrace = stdout;
    strcpy((char *)NetTraceFile, "(standard output)");
}

    void
Dump(direction, buffer, length)
    char direction;
    unsigned char *buffer;
    int length;
{
#   define BYTES_PER_LINE	32
#   define min(x,y)	((x<y)? x:y)
    unsigned char *pThis;
    int offset;
    extern pettydump;

    offset = 0;

    while (length) {
	/* print one line */
	fprintf(NetTrace, "%c 0x%x\t", direction, offset);
	pThis = buffer;
	if (prettydump) {
	    buffer = buffer + min(length, BYTES_PER_LINE/2);
	    while (pThis < buffer) {
		fprintf(NetTrace, "%c%.2x",
		    (((*pThis)&0xff) == 0xff) ? '*' : ' ',
		    (*pThis)&0xff);
		pThis++;
	    }
	    length -= BYTES_PER_LINE/2;
	    offset += BYTES_PER_LINE/2;
	} else {
	    buffer = buffer + min(length, BYTES_PER_LINE);
	    while (pThis < buffer) {
		fprintf(NetTrace, "%.2x", (*pThis)&0xff);
		pThis++;
	    }
	    length -= BYTES_PER_LINE;
	    offset += BYTES_PER_LINE;
	}
	if (NetTrace == stdout) {
	    fprintf(NetTrace, "\r\n");
	} else {
	    fprintf(NetTrace, "\n");
	}
	if (length < 0) {
	    fflush(NetTrace);
	    return;
	}
	/* find next unique line */
    }
    fflush(NetTrace);
}


	void
printoption(direction, cmd, option)
	char *direction;
	int cmd, option;
{
	if (!showoptions)
		return;
	if (cmd == IAC) {
		if (TELCMD_OK(option))
		    fprintf(NetTrace, "%s IAC %s", direction, TELCMD(option));
		else
		    fprintf(NetTrace, "%s IAC %d", direction, option);
	} else {
		register char *fmt;
		fmt = (cmd == WILL) ? "WILL" : (cmd == WONT) ? "WONT" :
			(cmd == DO) ? "DO" : (cmd == DONT) ? "DONT" : 0;
		if (fmt) {
		    fprintf(NetTrace, "%s %s ", direction, fmt);
		    if (TELOPT_OK(option))
			fprintf(NetTrace, "%s", TELOPT(option));
		    else if (option == TELOPT_EXOPL)
			fprintf(NetTrace, "EXOPL");
		    else
			fprintf(NetTrace, "%d", option);
		} else
		    fprintf(NetTrace, "%s %d %d", direction, cmd, option);
	}
	if (NetTrace == stdout) {
	    fprintf(NetTrace, "\r\n");
	    fflush(NetTrace);
	} else {
	    fprintf(NetTrace, "\n");
	}
	return;
}

    void
optionstatus()
{
    register int i;
    extern char will_wont_resp[], do_dont_resp[];

    for (i = 0; i < 256; i++) {
	if (do_dont_resp[i]) {
	    if (TELOPT_OK(i))
		printf("resp DO_DONT %s: %d\n", TELOPT(i), do_dont_resp[i]);
	    else if (TELCMD_OK(i))
		printf("resp DO_DONT %s: %d\n", TELCMD(i), do_dont_resp[i]);
	    else
		printf("resp DO_DONT %d: %d\n", i,
				do_dont_resp[i]);
	    if (my_want_state_is_do(i)) {
		if (TELOPT_OK(i))
		    printf("want DO   %s\n", TELOPT(i));
		else if (TELCMD_OK(i))
		    printf("want DO   %s\n", TELCMD(i));
		else
		    printf("want DO   %d\n", i);
	    } else {
		if (TELOPT_OK(i))
		    printf("want DONT %s\n", TELOPT(i));
		else if (TELCMD_OK(i))
		    printf("want DONT %s\n", TELCMD(i));
		else
		    printf("want DONT %d\n", i);
	    }
	} else {
	    if (my_state_is_do(i)) {
		if (TELOPT_OK(i))
		    printf("     DO   %s\n", TELOPT(i));
		else if (TELCMD_OK(i))
		    printf("     DO   %s\n", TELCMD(i));
		else
		    printf("     DO   %d\n", i);
	    }
	}
	if (will_wont_resp[i]) {
	    if (TELOPT_OK(i))
		printf("resp WILL_WONT %s: %d\n", TELOPT(i), will_wont_resp[i]);
	    else if (TELCMD_OK(i))
		printf("resp WILL_WONT %s: %d\n", TELCMD(i), will_wont_resp[i]);
	    else
		printf("resp WILL_WONT %d: %d\n",
				i, will_wont_resp[i]);
	    if (my_want_state_is_will(i)) {
		if (TELOPT_OK(i))
		    printf("want WILL %s\n", TELOPT(i));
		else if (TELCMD_OK(i))
		    printf("want WILL %s\n", TELCMD(i));
		else
		    printf("want WILL %d\n", i);
	    } else {
		if (TELOPT_OK(i))
		    printf("want WONT %s\n", TELOPT(i));
		else if (TELCMD_OK(i))
		    printf("want WONT %s\n", TELCMD(i));
		else
		    printf("want WONT %d\n", i);
	    }
	} else {
	    if (my_state_is_will(i)) {
		if (TELOPT_OK(i))
		    printf("     WILL %s\n", TELOPT(i));
		else if (TELCMD_OK(i))
		    printf("     WILL %s\n", TELCMD(i));
		else
		    printf("     WILL %d\n", i);
	    }
	}
    }

}

    void
printsub(direction, pointer, length)
    char direction;	/* '<' or '>' */
    unsigned char *pointer;	/* where suboption data sits */
    int		  length;	/* length of suboption data */
{
    register int i;
    char buf[512];
    extern int want_status_response;

    if (showoptions || direction == 0 ||
	(want_status_response && (pointer[0] == TELOPT_STATUS))) {
	if (direction) {
	    fprintf(NetTrace, "%s IAC SB ",
				(direction == '<')? "RCVD":"SENT");
	    if (length >= 3) {
		register int j;

		i = pointer[length-2];
		j = pointer[length-1];

		if (i != IAC || j != SE) {
		    fprintf(NetTrace, "(terminated by ");
		    if (TELOPT_OK(i))
			fprintf(NetTrace, "%s ", TELOPT(i));
		    else if (TELCMD_OK(i))
			fprintf(NetTrace, "%s ", TELCMD(i));
		    else
			fprintf(NetTrace, "%d ", i);
		    if (TELOPT_OK(j))
			fprintf(NetTrace, "%s", TELOPT(j));
		    else if (TELCMD_OK(j))
			fprintf(NetTrace, "%s", TELCMD(j));
		    else
			fprintf(NetTrace, "%d", j);
		    fprintf(NetTrace, ", not IAC SE!) ");
		}
	    }
	    length -= 2;
	}
	if (length < 1) {
	    fprintf(NetTrace, "(Empty suboption??\?)");
	    if (NetTrace == stdout)
		fflush(NetTrace);
	    return;
	}
	switch (pointer[0]) {
	case TELOPT_TTYPE:
	    fprintf(NetTrace, "TERMINAL-TYPE ");
	    switch (pointer[1]) {
	    case TELQUAL_IS:
		fprintf(NetTrace, "IS \"%.*s\"", length-2, (char *)pointer+2);
		break;
	    case TELQUAL_SEND:
		fprintf(NetTrace, "SEND");
		break;
	    default:
		fprintf(NetTrace,
				"- unknown qualifier %d (0x%x).",
				pointer[1], pointer[1]);
	    }
	    break;
	case TELOPT_TSPEED:
	    fprintf(NetTrace, "TERMINAL-SPEED");
	    if (length < 2) {
		fprintf(NetTrace, " (empty suboption??\?)");
		break;
	    }
	    switch (pointer[1]) {
	    case TELQUAL_IS:
		fprintf(NetTrace, " IS ");
		fprintf(NetTrace, "%.*s", length-2, (char *)pointer+2);
		break;
	    default:
		if (pointer[1] == 1)
		    fprintf(NetTrace, " SEND");
		else
		    fprintf(NetTrace, " %d (unknown)", pointer[1]);
		for (i = 2; i < length; i++)
		    fprintf(NetTrace, " ?%d?", pointer[i]);
		break;
	    }
	    break;

	case TELOPT_LFLOW:
	    fprintf(NetTrace, "TOGGLE-FLOW-CONTROL");
	    if (length < 2) {
		fprintf(NetTrace, " (empty suboption??\?)");
		break;
	    }
	    switch (pointer[1]) {
	    case LFLOW_OFF:
		fprintf(NetTrace, " OFF"); break;
	    case LFLOW_ON:
		fprintf(NetTrace, " ON"); break;
	    case LFLOW_RESTART_ANY:
		fprintf(NetTrace, " RESTART-ANY"); break;
	    case LFLOW_RESTART_XON:
		fprintf(NetTrace, " RESTART-XON"); break;
	    default:
		fprintf(NetTrace, " %d (unknown)", pointer[1]);
	    }
	    for (i = 2; i < length; i++)
		fprintf(NetTrace, " ?%d?", pointer[i]);
	    break;

	case TELOPT_NAWS:
	    fprintf(NetTrace, "NAWS");
	    if (length < 2) {
		fprintf(NetTrace, " (empty suboption??\?)");
		break;
	    }
	    if (length == 2) {
		fprintf(NetTrace, " ?%d?", pointer[1]);
		break;
	    }
	    fprintf(NetTrace, " %d %d (%d)",
		pointer[1], pointer[2],
		(int)((((unsigned int)pointer[1])<<8)|((unsigned int)pointer[2])));
	    if (length == 4) {
		fprintf(NetTrace, " ?%d?", pointer[3]);
		break;
	    }
	    fprintf(NetTrace, " %d %d (%d)",
		pointer[3], pointer[4],
		(int)((((unsigned int)pointer[3])<<8)|((unsigned int)pointer[4])));
	    for (i = 5; i < length; i++)
		fprintf(NetTrace, " ?%d?", pointer[i]);
	    break;

#if	defined(AUTHENTICATION)
	case TELOPT_AUTHENTICATION:
	    fprintf(NetTrace, "AUTHENTICATION");
	    if (length < 2) {
		fprintf(NetTrace, " (empty suboption??\?)");
		break;
	    }
	    switch (pointer[1]) {
	    case TELQUAL_REPLY:
	    case TELQUAL_IS:
		fprintf(NetTrace, " %s ", (pointer[1] == TELQUAL_IS) ?
							"IS" : "REPLY");
		if (AUTHTYPE_NAME_OK(pointer[2]))
		    fprintf(NetTrace, "%s ", AUTHTYPE_NAME(pointer[2]));
		else
		    fprintf(NetTrace, "%d ", pointer[2]);
		if (length < 3) {
		    fprintf(NetTrace, "(partial suboption??\?)");
		    break;
		}
		fprintf(NetTrace, "%s|%s",
			((pointer[3] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
			"CLIENT" : "SERVER",
			((pointer[3] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
			"MUTUAL" : "ONE-WAY");

		auth_printsub(&pointer[1], length - 1, buf, sizeof(buf));
		fprintf(NetTrace, "%s", buf);
		break;

	    case TELQUAL_SEND:
		i = 2;
		fprintf(NetTrace, " SEND ");
		while (i < length) {
		    if (AUTHTYPE_NAME_OK(pointer[i]))
			fprintf(NetTrace, "%s ", AUTHTYPE_NAME(pointer[i]));
		    else
			fprintf(NetTrace, "%d ", pointer[i]);
		    if (++i >= length) {
			fprintf(NetTrace, "(partial suboption??\?)");
			break;
		    }
		    fprintf(NetTrace, "%s|%s ",
			((pointer[i] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
							"CLIENT" : "SERVER",
			((pointer[i] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
							"MUTUAL" : "ONE-WAY");
		    ++i;
		}