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guid-utils.c

/* guid-utils.c
 * GUID handling
 *
 * $Id: guid-utils.c 30691 2009-10-25 11:43:30Z etxrab $
 *
 * 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 <string.h>

#include <glib.h>
#include <epan/epan.h>
#include <wsutil/unicode-utils.h>
#include <epan/emem.h>
#include "guid-utils.h"

#ifdef _WIN32
#include <tchar.h>
#include <windows.h>
#endif

static emem_tree_t *guid_to_name_tree = NULL;


#ifdef _WIN32
/* try to resolve an DCE/RPC interface name to it's name using the Windows registry entries */
/* XXX - might be better to fill all interfaces into our database at startup instead of searching each time */
int
ResolveWin32UUID(e_guid_t if_id, char *uuid_name, int uuid_name_max_len)
{
      TCHAR *reg_uuid_name;
      HKEY hKey = NULL;
      DWORD uuid_max_size = MAX_PATH;
      TCHAR *reg_uuid_str;

      reg_uuid_name=ep_alloc(MAX_PATH*sizeof(TCHAR));
      reg_uuid_str=ep_alloc(MAX_PATH*sizeof(TCHAR));

      if(uuid_name_max_len < 2){
            return 0;
      }
      reg_uuid_name[0] = '\0';
      _snwprintf(reg_uuid_str, MAX_PATH, _T("SOFTWARE\\Classes\\Interface\\{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}"),
                  if_id.data1, if_id.data2, if_id.data3,
                  if_id.data4[0], if_id.data4[1],
                  if_id.data4[2], if_id.data4[3],
                  if_id.data4[4], if_id.data4[5],
                  if_id.data4[6], if_id.data4[7]);
      if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, reg_uuid_str, 0, KEY_QUERY_VALUE, &hKey) == ERROR_SUCCESS) {
            if (RegQueryValueEx(hKey, NULL, NULL, NULL, (LPBYTE)reg_uuid_name, &uuid_max_size) == ERROR_SUCCESS && uuid_max_size <= MAX_PATH) {
                  g_snprintf(uuid_name, uuid_name_max_len, "%s", utf_16to8(reg_uuid_name));
                  RegCloseKey(hKey);
                  return (int) strlen(uuid_name);
            }
            RegCloseKey(hKey);
      }
      return 0; /* we didn't find anything anyhow. Please don't use the string! */

}
#endif


/* store a guid to name mapping */
void
guids_add_guid(e_guid_t *guid, const gchar *name)
{
      emem_tree_key_t guidkey[2];
      guint32 g[4];

      g[0]=guid->data1;

      g[1]=guid->data2;
      g[1]<<=16;
      g[1]|=guid->data3;

      g[2]=guid->data4[0];
      g[2]<<=8;
      g[2]|=guid->data4[1];
      g[2]<<=8;
      g[2]|=guid->data4[2];
      g[2]<<=8;
      g[2]|=guid->data4[3];

      g[3]=guid->data4[4];
      g[3]<<=8;
      g[3]|=guid->data4[5];
      g[3]<<=8;
      g[3]|=guid->data4[6];
      g[3]<<=8;
      g[3]|=guid->data4[7];

      guidkey[0].key=g;
      guidkey[0].length=4;
      guidkey[1].length=0;

      pe_tree_insert32_array(guid_to_name_tree, &guidkey[0], (gchar *) name);
}


/* retrieve the registered name for this GUID */
const gchar *
guids_get_guid_name(e_guid_t *guid)
{
      emem_tree_key_t guidkey[2];
      guint32 g[4];
      char *name;
#ifdef _WIN32
      static char *uuid_name;
#endif

      g[0]=guid->data1;

      g[1]=guid->data2;
      g[1]<<=16;
      g[1]|=guid->data3;

      g[2]=guid->data4[0];
      g[2]<<=8;
      g[2]|=guid->data4[1];
      g[2]<<=8;
      g[2]|=guid->data4[2];
      g[2]<<=8;
      g[2]|=guid->data4[3];

      g[3]=guid->data4[4];
      g[3]<<=8;
      g[3]|=guid->data4[5];
      g[3]<<=8;
      g[3]|=guid->data4[6];
      g[3]<<=8;
      g[3]|=guid->data4[7];

      guidkey[0].key=g;
      guidkey[0].length=4;
      guidkey[1].length=0;

      if((name = pe_tree_lookup32_array(guid_to_name_tree, &guidkey[0]))){
            return name;
      }

#ifdef _WIN32
      /* try to resolve the mapping from the Windows registry */
      /* XXX - prefill the resolving database with all the Windows registry entries once at init only (instead of searching each time)? */
      uuid_name=ep_alloc(128);
      if(ResolveWin32UUID(*guid, uuid_name, 128)) {
            return uuid_name;
      }
#endif

      return NULL;
}


void
guids_init(void)
{
      guid_to_name_tree=pe_tree_create(EMEM_TREE_TYPE_RED_BLACK, "guid_to_name");
      /* XXX here is a good place to read a config file with wellknown guids */
}


/* Tries to match a guid against its name.
   Returns the associated string ptr on a match.
   Formats uuid number and returns the resulting string, if name is unknown.
   (derived from val_to_str) */
const gchar *
guids_resolve_guid_to_str(e_guid_t *guid)
{
      const gchar *name;

      name=guids_get_guid_name(guid);
      if(name){
            return name;
      }

      return ep_strdup_printf("%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
                      guid->data1, guid->data2, guid->data3,
                      guid->data4[0], guid->data4[1],
                      guid->data4[2], guid->data4[3],
                      guid->data4[4], guid->data4[5],
                      guid->data4[6], guid->data4[7]);
}


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