text: /* 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/wmem.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(wmem_packet_scope(), (MAX_PATH*sizeof(TCHAR))+1);
  	reg_uuid_str=wmem_alloc(wmem_packet_scope(), (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) {
  			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(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 */
  const gchar *
  guids_get_guid_name(const e_guid_t *guid)
  {
  	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(wmem_packet_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, if name is unknown.
     (derived from val_to_str) */
  const gchar *
  guids_resolve_guid_to_str(const e_guid_t *guid)
  {
  	const gchar *name;
  
  	name=guids_get_guid_name(guid);
  	if(name){
  		return name;
  	}
  
  	return wmem_strdup_printf(wmem_packet_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);
  }
  
  /*
   * Editor modelines  -  http://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:
   */
  