xref: /onnv-gate/usr/src/cmd/cmd-inet/usr.sbin/snoop/snoop_tftp.c (revision 410:51e39f6c6311)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <fcntl.h>
#include <arpa/tftp.h>
#include "snoop.h"

extern char *dlc_header;
char *tftperror();
char *show_type();

int
interpret_tftp(int flags, struct tftphdr *tftp, int fraglen)
{
	char *name, *mode;
	extern int src_port, dst_port;
	int blocksize = fraglen - 4;

	switch (ntohs(tftp->th_opcode)) {
	case RRQ:
	case WRQ:
		add_transient(src_port, interpret_tftp);
		break;
	case ERROR:
		del_transient(src_port);
		break;
	}

	if (flags & F_SUM) {
		switch (ntohs(tftp->th_opcode)) {
		case RRQ:
			name = (char *)&tftp->th_stuff;
			mode = name + (strlen(name) + 1);
			(void) sprintf(get_sum_line(),
				"TFTP Read \"%s\" (%s)", name, mode);
			break;
		case WRQ:
			name = (char *)&tftp->th_stuff;
			mode = name + (strlen(name) + 1);
			(void) sprintf(get_sum_line(),
				"TFTP Write \"%s\" (%s)", name, mode);
			break;
		case DATA:
			(void) sprintf(get_sum_line(),
				"TFTP Data block %d (%d bytes)%s",
				ntohs(tftp->th_block),
				blocksize,
				blocksize < 512 ? " (last block)":"");
			break;
		case ACK:
			(void) sprintf(get_sum_line(),
				"TFTP Ack  block %d",
				ntohs(tftp->th_block));
			break;
		case ERROR:
			(void) sprintf(get_sum_line(),
				"TFTP Error: %s",
				tftperror(ntohs(tftp->th_code)));
			break;
		}
	}

	if (flags & F_DTAIL) {

	show_header("TFTP:  ", "Trivial File Transfer Protocol", fraglen);
	show_space();
	(void) sprintf(get_line((char *)(uintptr_t)tftp->th_opcode -
		dlc_header, 2),
		"Opcode = %d (%s)",
		ntohs(tftp->th_opcode),
		show_type(ntohs(tftp->th_opcode)));

	switch (ntohs(tftp->th_opcode)) {
	case RRQ:
	case WRQ:
		name = (char *)&tftp->th_stuff;
		mode = name + (strlen(name) + 1);
		(void) sprintf(
			get_line(name - dlc_header, strlen(name) + 1),
			"File name = \"%s\"",
			name);
		(void) sprintf(
			get_line(mode - dlc_header, strlen(mode) + 1),
			"Transfer mode = %s",
			mode);
		break;

	case DATA:
		(void) sprintf(
			get_line((char *)(uintptr_t)tftp->th_block -
			dlc_header, 2),	"Data block = %d%s",
			ntohs(tftp->th_block),
			blocksize < 512 ? " (last block)":"");
		(void) sprintf(get_line((char *)(uintptr_t)tftp->th_data -
			dlc_header, blocksize),
			"[ %d bytes of data ]",
			blocksize);
		break;

	case ACK:
		(void) sprintf(get_line((char *)(uintptr_t)tftp->th_block -
			dlc_header, 2),	"Acknowledge block = %d",
			ntohs(tftp->th_block));
		break;

	case ERROR:
		(void) sprintf(get_line((char *)(uintptr_t)tftp->th_code -
			dlc_header, 2),	"Error = %d (%s)",
			ntohs(tftp->th_code),
			tftperror(ntohs(tftp->th_code)));
		(void) sprintf(get_line((char *)(uintptr_t)tftp->th_data -
			dlc_header, strlen(tftp->th_data) + 1),
			"Error string = \"%s\"", tftp->th_data);
	}
	}

	return (fraglen);
}

char *
show_type(t)
	int t;
{
	switch (t) {
	case RRQ:	return ("read request");
	case WRQ:	return ("write request");
	case DATA:	return ("data packet");
	case ACK:	return ("acknowledgement");
	case ERROR:	return ("error");
	}
	return ("?");
}

char *
tftperror(code)
    unsigned short code;
{
	static char buf[128];

	switch (code) {
	case EUNDEF:	return ("not defined");
	case ENOTFOUND:	return ("file not found");
	case EACCESS:	return ("access violation");
	case ENOSPACE:	return ("disk full or allocation exceeded");
	case EBADOP:	return ("illegal TFTP operation");
	case EBADID:	return ("unknown transfer ID");
	case EEXISTS:	return ("file already exists");
	case ENOUSER:	return ("no such user");
	}
	(void) sprintf(buf, "%d", code);

	return (buf);
}