forked from osmocom/wireshark
![Laurent Deniel](/assets/img/avatar_default.png)
the following: It is now possible to enable/disable a particular protocol decoding (i.e. the protocol dissector is void or not). When a protocol is disabled, it is displayed as Data and of course, all linked sub-protocols are disabled as well. Disabling a protocol could be interesting: - in case of buggy dissectors - in case of wrong heuristics - for performance reasons - to decode the data as another protocol (TODO) Currently (if I am not wrong), all dissectors but NFS can be disabled (and dissectors that do not register protocols :-) I do not like the way the RPC sub-dissectors are disabled (in the sub-dissectors) since this could be done in the RPC dissector itself, knowing the sub-protocol hfinfo entry (this is why, I've not modified the NFS one yet). Two functions are added in proto.c : gboolean proto_is_protocol_enabled(int n); void proto_set_decoding(int n, gboolean enabled); and two MACROs which can be used in dissectors: OLD_CHECK_DISPLAY_AS_DATA(index, pd, offset, fd, tree) CHECK_DISPLAY_AS_DATA(index, tvb, pinfo, tree) See also the XXX in proto_dlg.c and proto.c around the new functions. svn path=/trunk/; revision=2267
254 lines
7.8 KiB
C
254 lines
7.8 KiB
C
/* 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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* $Id: packet-syslog.c,v 1.6 2000/08/13 14:07:53 deniel Exp $
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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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/* The maximum number if priority digits to read in. */
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#define MAX_DIGITS 3
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#define COL_INFO_LEN 32
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#define ELLIPSIS "..." /* ISO 8859-1 doesn't appear to have a real ellipsis. */
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static const value_string short_lev[] = {
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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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{ 9, "CRON" }, /* The BSDs, Linux, and others */
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{ 10, "AUTHPRIV" },
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{ 11, "FTP" },
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{ 15, "CRON" }, /* Solaris */
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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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static const value_string long_lev[] = {
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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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{ 9, "CRON - clock daemon (BSD, Linux)" },
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{ 10, "AUTHPRIV - security/authorization messages (private)" },
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{ 11, "FTP - ftp daemon" },
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{ 15, "CRON - clock daemon (Solaris)" },
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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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static gint hf_syslog_level = -1;
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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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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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upper five bits are the facility. T is the message text.
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*/
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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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gint pri = -1, lev = -1, fac = -1;
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gint msg_off = 0, msg_len;
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gint ellipsis_len = (COL_INFO_LEN - strlen(ELLIPSIS)) - 1;
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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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CHECK_DISPLAY_AS_DATA(proto_syslog, tvb, pinfo, tree);
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pinfo->current_proto = "Syslog";
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msg_len = tvb_length(tvb);
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if (tvb_get_guint8(tvb, 0) == '<' && isdigit(tvb_get_guint8(tvb, 1))) {
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msg_off++;
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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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tvb_length_remaining(tvb, msg_off)) {
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pri = pri * 10 + (tvb_get_guint8(tvb, msg_off) - '0');
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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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fac = (pri & FACILITY_MASK) >> 3;
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lev = pri & PRIORITY_MASK;
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}
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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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if (msg_len >= COL_INFO_LEN) {
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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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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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if (pri >= 0) {
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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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val_to_str(lev, short_lev, "UNKNOWN"), msg_str);
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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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if (pri >= 0) {
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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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val_to_str(lev, short_lev, "UNKNOWN"), msg_str);
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} else {
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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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}
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syslog_tree = proto_item_add_subtree(ti, ett_syslog);
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if (pri >= 0) {
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ti = proto_tree_add_uint(syslog_tree, hf_syslog_facility, tvb, 0,
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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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}
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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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{ &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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},
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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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"Message length, excluding priority descriptor" }
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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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