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/* guid-utils.c
* GUID handling
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
*
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <string.h>
#include <glib.h>
#include <epan/epan.h>
#include <wsutil/unicode-utils.h>
#include <epan/wmem_scopes.h>
#include "guid-utils.h"
#ifdef _WIN32
#include <tchar.h>
#include <windows.h>
#include <strsafe.h>
#endif
static wmem_tree_t *guid_to_name_tree = NULL;
#ifdef _WIN32
/* try to resolve an DCE/RPC interface name to its name using the Windows registry entries */
/* XXX - might be better to fill all interfaces into our database at startup instead of searching each time */
static 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=wmem_alloc(NULL, (MAX_PATH*sizeof(TCHAR))+1);
reg_uuid_str=wmem_alloc(NULL, (MAX_PATH*sizeof(TCHAR))+1);
if(uuid_name_max_len < 2){
return 0;
}
reg_uuid_name[0] = '\0';
StringCchPrintf(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) {
snprintf(uuid_name, uuid_name_max_len, "%s", utf_16to8(reg_uuid_name));
RegCloseKey(hKey);
wmem_free(NULL, reg_uuid_name);
wmem_free(NULL, reg_uuid_str);
return (int) strlen(uuid_name);
}
RegCloseKey(hKey);
}
wmem_free(NULL, reg_uuid_name);
wmem_free(NULL, reg_uuid_str);
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(const e_guid_t *guid, const gchar *name)
{
wmem_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;
wmem_tree_insert32_array(guid_to_name_tree, &guidkey[0], (gchar *) name);
}
/* retrieve the registered name for this GUID; uses the scope for the fallback case only */
const gchar *
guids_get_guid_name(const e_guid_t *guid, wmem_allocator_t *scope _U_)
{
wmem_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 = (char *)wmem_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=wmem_alloc(scope, 128);
if(ResolveWin32UUID(*guid, uuid_name, 128)) {
return uuid_name;
}
#endif
return NULL;
}
void
guids_init(void)
{
guid_to_name_tree=wmem_tree_new(wmem_epan_scope());
/* 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 via wmem scope, if name is unknown.
(derived from val_to_str) */
const gchar *
guids_resolve_guid_to_str(const e_guid_t *guid, wmem_allocator_t *scope)
{
const gchar *name;
name=guids_get_guid_name(guid, scope);
if(name){
return name;
}
return wmem_strdup_printf(scope, "%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]);
}
int guid_cmp(const e_guid_t *g1, const e_guid_t *g2)
{
if (g1->data1 != g2->data1) {
return (g1->data1 < g2->data1) ? -1 : 1;
}
if (g1->data2 != g2->data2) {
return (g1->data2 < g2->data2) ? -1 : 1;
}
if (g1->data3 != g2->data3) {
return (g1->data3 < g2->data3) ? -1 : 1;
}
return memcmp(&g1->data4[0], &g2->data4[0], 8);
}
guint guid_hash(const e_guid_t *guid)
{
return g_int64_hash((const gint64 *)guid);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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