2000-06-11 05:19:21 +00:00
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/* packet-syslog.c
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* Routines for syslog message dissection
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*
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* Copyright 2000, Gerald Combs <gerald@zing.org>
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*
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2000-06-18 22:12:14 +00:00
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* $Id: packet-syslog.c,v 1.4 2000/06/18 22:12:14 gerald Exp $
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2000-06-11 05:19:21 +00:00
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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#define UDP_PORT_SYSLOG 514
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#define PRIORITY_MASK 0x0007 /* 0000 0111 */
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#define FACILITY_MASK 0x03f8 /* 1111 1000 */
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2000-06-11 15:54:03 +00:00
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/* The maximum number if priority digits to read in. */
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#define MAX_DIGITS 3
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2000-06-18 22:12:14 +00:00
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#define COL_INFO_LEN 32
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2000-06-11 05:19:21 +00:00
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#define ELLIPSIS "..." /* ISO 8859-1 doesn't appear to have a real ellipsis. */
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2000-06-11 15:54:03 +00:00
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static const value_string short_lev[] = {
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2000-06-11 05:19:21 +00:00
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{ 0, "EMERG" },
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{ 1, "ALERT" },
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{ 2, "CRIT" },
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{ 3, "ERR" },
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{ 4, "WARNING" },
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{ 5, "NOTICE" },
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{ 6, "INFO" },
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{ 7, "DEBUG" },
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{ 0, NULL },
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};
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static const value_string short_fac[] = {
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{ 0, "KERN" },
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{ 1, "USER" },
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{ 2, "MAIL" },
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{ 3, "DAEMON" },
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{ 4, "AUTH" },
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{ 5, "SYSLOG" },
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{ 6, "LPR" },
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{ 7, "NEWS" },
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{ 8, "UUCP" },
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2000-06-11 15:54:03 +00:00
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{ 9, "CRON" }, /* The BSDs, Linux, and others */
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2000-06-11 05:19:21 +00:00
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{ 10, "AUTHPRIV" },
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{ 11, "FTP" },
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2000-06-11 15:54:03 +00:00
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{ 15, "CRON" }, /* Solaris */
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2000-06-11 05:19:21 +00:00
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{ 16, "LOCAL0" },
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{ 17, "LOCAL1" },
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{ 18, "LOCAL2" },
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{ 19, "LOCAL3" },
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{ 20, "LOCAL4" },
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{ 21, "LOCAL5" },
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{ 22, "LOCAL6" },
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{ 23, "LOCAL7" },
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{ 0, NULL },
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};
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2000-06-11 15:54:03 +00:00
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static const value_string long_lev[] = {
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2000-06-11 05:19:21 +00:00
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{ 0, "EMERG - system is unusable" },
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{ 1, "ALERT - action must be taken immediately" },
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{ 2, "CRIT - critical conditions" },
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{ 3, "ERR - error conditions" },
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{ 4, "WARNING - warning conditions" },
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{ 5, "NOTICE - normal but significant condition" },
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{ 6, "INFO - informational" },
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{ 7, "DEBUG - debug-level messages" },
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{ 0, NULL },
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};
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static const value_string long_fac[] = {
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{ 0, "KERN - kernel messages" },
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{ 1, "USER - random user-level messages" },
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{ 2, "MAIL - mail system" },
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{ 3, "DAEMON - system daemons" },
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{ 4, "AUTH - security/authorization messages" },
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{ 5, "SYSLOG - messages generated internally by syslogd" },
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{ 6, "LPR - line printer subsystem" },
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{ 7, "NEWS - network news subsystem" },
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{ 8, "UUCP - UUCP subsystem" },
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2000-06-11 15:54:03 +00:00
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{ 9, "CRON - clock daemon (BSD, Linux)" },
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2000-06-11 05:19:21 +00:00
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{ 10, "AUTHPRIV - security/authorization messages (private)" },
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{ 11, "FTP - ftp daemon" },
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2000-06-11 15:54:03 +00:00
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{ 15, "CRON - clock daemon (Solaris)" },
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2000-06-11 05:19:21 +00:00
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{ 16, "LOCAL0 - reserved for local use" },
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{ 17, "LOCAL1 - reserved for local use" },
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{ 18, "LOCAL2 - reserved for local use" },
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{ 19, "LOCAL3 - reserved for local use" },
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{ 20, "LOCAL4 - reserved for local use" },
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{ 21, "LOCAL5 - reserved for local use" },
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{ 22, "LOCAL6 - reserved for local use" },
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{ 23, "LOCAL7 - reserved for local use" },
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{ 0, NULL },
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};
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static gint proto_syslog = -1;
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2000-06-11 15:54:03 +00:00
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static gint hf_syslog_level = -1;
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2000-06-11 05:19:21 +00:00
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static gint hf_syslog_facility = -1;
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static gint hf_syslog_msg_len = -1;
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static gint ett_syslog = -1;
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/* I couldn't find any documentation for the syslog message format.
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2000-06-11 15:54:03 +00:00
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According to the BSD sources, the message format is '<', P, '>', and
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T. P is a decimal value, which should be treated as an 8 bit
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unsigned integer. The lower three bits comprise the level, and the
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2000-06-11 05:19:21 +00:00
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upper five bits are the facility. T is the message text.
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*/
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#if 0
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static void dissect_syslog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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2000-06-11 15:54:03 +00:00
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gint pri = -1, lev, fac;
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2000-06-11 05:19:21 +00:00
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gint msg_off = 0, msg_len;
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2000-06-11 15:54:03 +00:00
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gint ellipsis_len = (COL_INFO_LEN - strlen(ELLIPSIS)) - 1;
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2000-06-11 05:19:21 +00:00
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proto_item *ti;
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proto_tree *syslog_tree;
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gchar msg_str[COL_INFO_LEN];
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#else
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static void dissect_syslog(const u_char *pd, int o, frame_data *fd, proto_tree *tree)
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{
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Convert IPX-and-friend dissectors in packet-ipx.c to use
tvbuffs.
In doing so, I realied that my recommendation for using
tvb_new_subset(pi.compat_top_tvb, -1, -1) was incorrect, because
some dissectors (ethernet!) change pi.len and pi.cap_len. So, I have
to take those two variables into account instead of using -1 and -1.
So, I provide a macro called tvb_create_from_top(offset), where
offset is the name of your offset variable. It is a wrapper around
tvb_new_subset().
I converted the lines that followed my suggestion to use
tvb_create_from_top().
In proto.c I added
proto_tree_add_debug_text(proto_tree*, const char*, ...)
It's much like proto_tree_add_text(), except that it takes no offset
or length; it's soley for temporarily putting debug text into the
proto_tree while debugging a dissector. In making sure that its
use is temporary, the funciton also prints the debug string to stdout
to remind the programmer that the debug code needs to be removed
before shipping the code.
svn path=/trunk/; revision=2068
2000-06-15 03:49:00 +00:00
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packet_info *pinfo = π
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tvbuff_t *tvb = tvb_create_from_top(o);
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2000-06-11 15:54:03 +00:00
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gint pri = -1, lev = -1, fac = -1;
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2000-06-11 05:19:21 +00:00
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gint msg_off = 0, msg_len;
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2000-06-11 15:54:03 +00:00
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gint ellipsis_len = (COL_INFO_LEN - strlen(ELLIPSIS)) - 1;
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2000-06-11 05:19:21 +00:00
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proto_item *ti;
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proto_tree *syslog_tree;
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gchar msg_str[COL_INFO_LEN];
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#endif
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pinfo->current_proto = "Syslog";
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msg_len = tvb_length(tvb);
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2000-06-11 15:54:03 +00:00
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if (tvb_get_guint8(tvb, 0) == '<' && isdigit(tvb_get_guint8(tvb, 1))) {
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2000-06-11 05:19:21 +00:00
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msg_off++;
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2000-06-11 15:54:03 +00:00
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pri = 0;
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while (isdigit(tvb_get_guint8(tvb, msg_off)) && msg_off <= MAX_DIGITS &&
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2000-06-11 05:19:21 +00:00
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tvb_length_remaining(tvb, msg_off)) {
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2000-06-11 15:54:03 +00:00
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pri = pri * 10 + (tvb_get_guint8(tvb, msg_off) - '0');
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2000-06-11 05:19:21 +00:00
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msg_off++;
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}
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if (tvb_get_guint8(tvb, msg_off) == '>')
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msg_off++;
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2000-06-11 15:54:03 +00:00
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fac = (pri & FACILITY_MASK) >> 3;
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lev = pri & PRIORITY_MASK;
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2000-06-11 05:19:21 +00:00
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}
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2000-06-11 15:54:03 +00:00
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/* Copy the message into a string buffer, with a trailing ellipsis if needed. */
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msg_len = tvb_length_remaining(tvb, msg_off);
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2000-06-18 22:12:14 +00:00
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if (msg_len >= COL_INFO_LEN) {
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2000-06-11 15:54:03 +00:00
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tvb_memcpy(tvb, msg_str, msg_off, ellipsis_len);
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strcpy (msg_str + ellipsis_len, ELLIPSIS);
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} else {
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tvb_memcpy(tvb, msg_str, msg_off, msg_len);
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msg_str[msg_len] = '\0';
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}
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2000-06-11 05:19:21 +00:00
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_add_str(pinfo->fd, COL_PROTOCOL, "Syslog");
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if (check_col(pinfo->fd, COL_INFO)) {
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2000-06-11 15:54:03 +00:00
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if (pri >= 0) {
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2000-06-11 05:19:21 +00:00
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col_add_fstr(pinfo->fd, COL_INFO, "%s.%s: %s",
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val_to_str(fac, short_fac, "UNKNOWN"),
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2000-06-11 15:54:03 +00:00
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val_to_str(lev, short_lev, "UNKNOWN"), msg_str);
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2000-06-11 05:19:21 +00:00
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} else {
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col_add_fstr(pinfo->fd, COL_INFO, "%s", msg_str);
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}
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}
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if (tree) {
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2000-06-11 15:54:03 +00:00
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if (pri >= 0) {
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2000-06-11 05:19:21 +00:00
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ti = proto_tree_add_protocol_format(tree, proto_syslog, tvb, 0,
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tvb_length(tvb), "Syslog message: %s.%s: %s",
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val_to_str(fac, short_fac, "UNKNOWN"),
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2000-06-11 15:54:03 +00:00
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val_to_str(lev, short_lev, "UNKNOWN"), msg_str);
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2000-06-11 05:19:21 +00:00
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} else {
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2000-06-11 15:54:03 +00:00
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ti = proto_tree_add_protocol_format(tree, proto_syslog, tvb, 0,
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tvb_length(tvb), "Syslog message: (unknown): %s", msg_str);
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2000-06-11 05:19:21 +00:00
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}
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syslog_tree = proto_item_add_subtree(ti, ett_syslog);
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2000-06-11 15:54:03 +00:00
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if (pri >= 0) {
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2000-06-11 05:19:21 +00:00
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ti = proto_tree_add_uint(syslog_tree, hf_syslog_facility, tvb, 0,
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2000-06-11 15:54:03 +00:00
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msg_off, pri);
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ti = proto_tree_add_uint(syslog_tree, hf_syslog_level, tvb, 0,
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msg_off, pri);
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2000-06-11 05:19:21 +00:00
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}
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proto_tree_add_uint_format(syslog_tree, hf_syslog_msg_len, tvb, msg_off,
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msg_len, msg_len, "Message (%d byte%s)", msg_len, plurality(msg_len, "", "s"));
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}
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return;
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}
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/* Register the protocol with Ethereal */
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void proto_register_syslog(void)
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{
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_syslog_facility,
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{ "Facility", "syslog.facility",
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FT_UINT8, BASE_DEC, VALS(long_fac), FACILITY_MASK,
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"Message facility" }
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},
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2000-06-11 15:54:03 +00:00
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{ &hf_syslog_level,
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{ "Level", "syslog.level",
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FT_UINT8, BASE_DEC, VALS(long_lev), PRIORITY_MASK,
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"Message level" }
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2000-06-11 05:19:21 +00:00
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},
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{ &hf_syslog_msg_len,
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{ "Message length", "syslog.msg_len",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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2000-06-11 15:54:03 +00:00
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"Message length, excluding priority descriptor" }
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2000-06-11 05:19:21 +00:00
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_syslog,
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};
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/* Register the protocol name and description */
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proto_syslog = proto_register_protocol("Syslog message", "syslog");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_syslog, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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};
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void
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proto_reg_handoff_syslog(void)
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{
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dissector_add("udp.port", UDP_PORT_SYSLOG, dissect_syslog);
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}
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