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expert.c

/* expert.c
 * Collecting Expert information.
 *
 * Implemented as a tap named "expert".
 *
 * $Id: expert.c 33988 2010-08-29 04:11:06Z gerald $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "packet.h"
#include "expert.h"
#include "emem.h"
#include "tap.h"



static int expert_tap         = -1;
static int proto_expert       = -1;
static int highest_severity   =  0;

static int ett_expert         = -1;
static int ett_subexpert      = -1;

static int hf_expert_msg      = -1;
static int hf_expert_group    = -1;
static int hf_expert_severity = -1;

const value_string expert_group_vals[] = {
      { PI_CHECKSUM,          "Checksum" },
      { PI_SEQUENCE,          "Sequence" },
      { PI_RESPONSE_CODE,     "Response" },
      { PI_REQUEST_CODE,      "Request" },
      { PI_UNDECODED,         "Undecoded" },
      { PI_REASSEMBLE,        "Reassemble" },
      { PI_MALFORMED,         "Malformed" },
      { PI_DEBUG,             "Debug" },
      { PI_PROTOCOL,          "Protocol" },
      { PI_SECURITY,          "Security" },
      { 0, NULL }
};

const value_string expert_severity_vals[] = {
      { PI_ERROR,             "Error" },
      { PI_WARN,              "Warn" },
      { PI_NOTE,              "Note" },
      { PI_CHAT,              "Chat" },
      { 0,                    "Ok" },
      { 0, NULL }
};

void
expert_init(void)
{
      static hf_register_info hf[] = {
            { &hf_expert_msg,
                  { "Message", "expert.message", FT_STRING, BASE_NONE, NULL, 0, "Wireshark expert information", HFILL }
            },
            { &hf_expert_group,
                  { "Group", "expert.group", FT_UINT32, BASE_NONE, VALS(expert_group_vals), 0, "Wireshark expert group", HFILL }
            },
            { &hf_expert_severity,
                  { "Severity level", "expert.severity", FT_UINT32, BASE_NONE, VALS(expert_severity_vals), 0, "Wireshark expert severity level", HFILL }
            }
      };
      static gint *ett[] = {
            &ett_expert,
            &ett_subexpert
      };

      if (expert_tap == -1) {
            expert_tap = register_tap("expert");
      }

      if (proto_expert == -1) {
            proto_expert = proto_register_protocol("Expert Info", "Expert", "expert");
            proto_register_field_array(proto_expert, hf, array_length(hf));
            proto_register_subtree_array(ett, array_length(ett));
            proto_set_cant_toggle(proto_expert);
      }

      highest_severity = 0;
}


void
expert_cleanup(void)
{

}


int
expert_get_highest_severity(void)
{
      return highest_severity;
}


/* set's the PI_ flags to a protocol item
 * (and its parent items till the toplevel) */
static void
expert_set_item_flags(proto_item *pi, int group, int severity)
{
      if (proto_item_set_expert_flags(pi, group, severity)) {
            /* propagate till toplevel item */
            pi = proto_item_get_parent(pi);
            expert_set_item_flags(pi, group, severity);
      }
}

static proto_tree*
expert_create_tree(proto_item *pi, int group, int severity, const char *msg)
{
      proto_tree *tree;
      proto_item *ti;

      tree = proto_item_add_subtree(pi, ett_expert);
      ti = proto_tree_add_protocol_format(tree, proto_expert, NULL, 0, 0, "Expert Info (%s/%s): %s",
                                  val_to_str(severity, expert_severity_vals, "Unknown (%u)"),
                                  val_to_str(group, expert_group_vals, "Unknown (%u)"),
                                  msg);
      PROTO_ITEM_SET_GENERATED(ti);

      if (group == PI_MALFORMED) {
            /* Add hidden malformed protocol filter */
            gint proto_malformed = proto_get_id_by_filter_name("malformed");
            proto_item *malformed_ti = proto_tree_add_item(tree, proto_malformed, NULL, 0, 0, FALSE);
            PROTO_ITEM_SET_HIDDEN(malformed_ti);
      }

      return proto_item_add_subtree(ti, ett_subexpert);
}

static void
expert_set_info_vformat(packet_info *pinfo, proto_item *pi, int group, int severity, const char *format, va_list ap)
{
      char            formatted[ITEM_LABEL_LENGTH];
      int             tap;
      expert_info_t   *ei;
      proto_tree      *tree;
      proto_item      *ti;

      /* if this packet isn't loaded because of a read filter, don't output anything */
      if (pinfo == NULL || PINFO_FD_NUM(pinfo) == 0) {
            return;
      }

      if (severity > highest_severity) {
            highest_severity = severity;
      }

      if (pi != NULL && PITEM_FINFO(pi) != NULL) {
            expert_set_item_flags(pi, group, severity);
      }

      col_add_str(pinfo->cinfo, COL_EXPERT, val_to_str(severity, expert_severity_vals, "Unknown (%u)"));

      g_vsnprintf(formatted, ITEM_LABEL_LENGTH, format, ap);

      tree = expert_create_tree(pi, group, severity, formatted);
      ti = proto_tree_add_string(tree, hf_expert_msg, NULL, 0, 0, formatted);
      PROTO_ITEM_SET_GENERATED(ti);
      ti = proto_tree_add_uint(tree, hf_expert_severity, NULL, 0, 0, severity);
      PROTO_ITEM_SET_GENERATED(ti);
      ti = proto_tree_add_uint(tree, hf_expert_group, NULL, 0, 0, group);
      PROTO_ITEM_SET_GENERATED(ti);

      tap = have_tap_listener(expert_tap);

      if (!tap)
            return;

      ei = ep_alloc(sizeof(expert_info_t));

      ei->packet_num  = PINFO_FD_NUM(pinfo);
      ei->group       = group;
      ei->severity    = severity;
      ei->protocol    = pinfo->current_proto;
      ei->summary     = ep_strdup(formatted);

      /* if we have a proto_item (not a faked item), set expert attributes to it */
      if (pi != NULL && PITEM_FINFO(pi) != NULL) {
            ei->pitem = pi;
      } else {
            ei->pitem = NULL;
      }

      tap_queue_packet(expert_tap, pinfo, ei);
}


void
expert_add_info_format(packet_info *pinfo, proto_item *pi, int group, int severity, const char *format, ...)
{
      va_list ap;

      va_start(ap, format);
      expert_set_info_vformat(pinfo, pi, group, severity, format, ap);
      va_end(ap);
}



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