epan/guid-utils.c

   1 /* guid-utils.c
   2  * GUID handling
   3  *
   4  * Wireshark - Network traffic analyzer
   5  * By Gerald Combs <gerald@wireshark.org>
   6  *
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2
  12  * of the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  22  */
  23
  24 #include "config.h"
  25
  26 #include <string.h>
  27
  28 #include <glib.h>
  29 #include <epan/epan.h>
  30 #include <wsutil/unicode-utils.h>
  31 #include <epan/emem.h>
  32 #include <epan/wmem/wmem.h>
  33 #include "guid-utils.h"
  34
  35 #ifdef _WIN32
  36 #include <tchar.h>
  37 #include <windows.h>
  38 #endif
  39
  40 static wmem_tree_t *guid_to_name_tree = NULL;
  41
  42
  43 #ifdef _WIN32
  44 /* try to resolve an DCE/RPC interface name to its name using the Windows registry entries */
  45 /* XXX - might be better to fill all interfaces into our database at startup instead of searching each time */
  46 int
  47 ResolveWin32UUID(e_guid_t if_id, char *uuid_name, int uuid_name_max_len)
  48 {
  49         TCHAR *reg_uuid_name;
  50         HKEY hKey = NULL;
  51         DWORD uuid_max_size = MAX_PATH;
  52         TCHAR *reg_uuid_str;
  53
  54         reg_uuid_name=ep_alloc(MAX_PATH*sizeof(TCHAR));
  55         reg_uuid_str=ep_alloc(MAX_PATH*sizeof(TCHAR));
  56
  57         if(uuid_name_max_len < 2){
  58                 return 0;
  59         }
  60         reg_uuid_name[0] = '\0';
  61         _snwprintf(reg_uuid_str, MAX_PATH, _T("SOFTWARE\\Classes\\Interface\\{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}"),
  62                         if_id.data1, if_id.data2, if_id.data3,
  63                         if_id.data4[0], if_id.data4[1],
  64                         if_id.data4[2], if_id.data4[3],
  65                         if_id.data4[4], if_id.data4[5],
  66                         if_id.data4[6], if_id.data4[7]);
  67         if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, reg_uuid_str, 0, KEY_QUERY_VALUE, &hKey) == ERROR_SUCCESS) {
  68                 if (RegQueryValueEx(hKey, NULL, NULL, NULL, (LPBYTE)reg_uuid_name, &uuid_max_size) == ERROR_SUCCESS && uuid_max_size <= MAX_PATH) {
  69                         g_snprintf(uuid_name, uuid_name_max_len, "%s", utf_16to8(reg_uuid_name));
  70                         RegCloseKey(hKey);
  71                         return (int) strlen(uuid_name);
  72                 }
  73                 RegCloseKey(hKey);
  74         }
  75         return 0; /* we didn't find anything anyhow. Please don't use the string! */
  76
  77 }
  78 #endif
  79
  80
  81 /* store a guid to name mapping */
  82 void
  83 guids_add_guid(const e_guid_t *guid, const gchar *name)
  84 {
  85         wmem_tree_key_t guidkey[2];
  86         guint32 g[4];
  87
  88         g[0]=guid->data1;
  89
  90         g[1]=guid->data2;
  91         g[1]<<=16;
  92         g[1]|=guid->data3;
  93
  94         g[2]=guid->data4[0];
  95         g[2]<<=8;
  96         g[2]|=guid->data4[1];
  97         g[2]<<=8;
  98         g[2]|=guid->data4[2];
  99         g[2]<<=8;
 100         g[2]|=guid->data4[3];
 101
 102         g[3]=guid->data4[4];
 103         g[3]<<=8;
 104         g[3]|=guid->data4[5];
 105         g[3]<<=8;
 106         g[3]|=guid->data4[6];
 107         g[3]<<=8;
 108         g[3]|=guid->data4[7];
 109
 110         guidkey[0].key=g;
 111         guidkey[0].length=4;
 112         guidkey[1].length=0;
 113
 114         wmem_tree_insert32_array(guid_to_name_tree, &guidkey[0], (gchar *) name);
 115 }
 116
 117
 118 /* retrieve the registered name for this GUID */
 119 const gchar *
 120 guids_get_guid_name(const e_guid_t *guid)
 121 {
 122         wmem_tree_key_t guidkey[2];
 123         guint32 g[4];
 124         char *name;
 125 #ifdef _WIN32
 126         static char *uuid_name;
 127 #endif
 128
 129         g[0]=guid->data1;
 130
 131         g[1]=guid->data2;
 132         g[1]<<=16;
 133         g[1]|=guid->data3;
 134
 135         g[2]=guid->data4[0];
 136         g[2]<<=8;
 137         g[2]|=guid->data4[1];
 138         g[2]<<=8;
 139         g[2]|=guid->data4[2];
 140         g[2]<<=8;
 141         g[2]|=guid->data4[3];
 142
 143         g[3]=guid->data4[4];
 144         g[3]<<=8;
 145         g[3]|=guid->data4[5];
 146         g[3]<<=8;
 147         g[3]|=guid->data4[6];
 148         g[3]<<=8;
 149         g[3]|=guid->data4[7];
 150
 151         guidkey[0].key=g;
 152         guidkey[0].length=4;
 153         guidkey[1].length=0;
 154
 155         if((name = (char *)wmem_tree_lookup32_array(guid_to_name_tree, &guidkey[0]))){
 156                 return name;
 157         }
 158
 159 #ifdef _WIN32
 160         /* try to resolve the mapping from the Windows registry */
 161         /* XXX - prefill the resolving database with all the Windows registry entries once at init only (instead of searching each time)? */
 162         uuid_name=ep_alloc(128);
 163         if(ResolveWin32UUID(*guid, uuid_name, 128)) {
 164                 return uuid_name;
 165         }
 166 #endif
 167
 168         return NULL;
 169 }
 170
 171
 172 void
 173 guids_init(void)
 174 {
 175         guid_to_name_tree=wmem_tree_new(wmem_epan_scope());
 176         /* XXX here is a good place to read a config file with wellknown guids */
 177 }
 178
 179
 180 /* Tries to match a guid against its name.
 181    Returns the associated string ptr on a match.
 182    Formats uuid number and returns the resulting string, if name is unknown.
 183    (derived from val_to_str) */
 184 const gchar *
 185 guids_resolve_guid_to_str(const e_guid_t *guid)
 186 {
 187         const gchar *name;
 188
 189         name=guids_get_guid_name(guid);
 190         if(name){
 191                 return name;
 192         }
 193
 194         return ep_strdup_printf("%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
 195                       guid->data1, guid->data2, guid->data3,
 196                       guid->data4[0], guid->data4[1],
 197                       guid->data4[2], guid->data4[3],
 198                       guid->data4[4], guid->data4[5],
 199                       guid->data4[6], guid->data4[7]);
 200 }
 201