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annotate common/util.h @ 841:216a65d7fc4b

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(issue66) Implement is_system_install and use it This has completly different implementations for linux and Windows. The commit also moves some code into util.c for better reuse.
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 29 Jul 2014 18:12:57 +0200
parents 4ad764bfb39c
children 427e2e18b8c8
rev   line source
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1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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8 #ifndef COMMON_UTIL_H
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9 #define COMMON_UTIL_H
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10 /* @file util.h
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11 * @brief The usual useful stuff that fit nowhere else
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12 */
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13 #include <stdbool.h>
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14
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15 #ifdef WIN32
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16 #include <windows.h>
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17 #include <psapi.h>
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18 #endif
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19
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20 #ifdef __cplusplus
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21 extern "C" {
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22 #endif
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23
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24 #ifndef WIN32
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25 /**@def Some value to use as equivalent as MAX_PATH on windows */
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26 #define MAX_PATH_LINUX 4000
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27 #endif
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28
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29 /**@brief Check if the current process is running with elevated privileges.
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30 *
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31 * Elevates the current process token to check if it is marked as elevated.
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32 * Uses TokenElevation on windows and checks effective UID on Linux.
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33 *
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34 * @returns true if the current process is elevated.*/
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35 bool is_elevated();
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36
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37 /**@brief Check if the Software is installed system wide
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38 *
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39 * On Windows this checks if a registry key under HKLM exists for
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40 * trustbridge and that the installation path mentioned there matches
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41 * the current module path.
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42 *
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43 * On linux this looks for the installation configuration in /etc
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44 * and checks if the current process is inside the installation prefix.
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45 *
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46 * The checked path is limited to MAX_PATH on Windows and @MAX_PATH_LINUX on
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47 * Linux.
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48 */
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49 bool is_system_install();
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50
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51 /**@brief Check if the user is in the administrators group.
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52 *
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53 * The function checks if the account that startet this process
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54 * belongs to a user that is a member of the Administrators group.
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55 *
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56 * @returns True if the user is in the admin group. False otherwise or on error.
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57 */
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58 bool is_admin();
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59
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60 /**@brief Get the directory in which the current process resides in
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61 *
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62 * Look up the directory in which the current process is placed.
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63 * If the path is longer then MAX_PATH NULL is returned.
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64 *
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65 * Returns a utf-8 encoded string that has to be freed by the caller
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66 * on linux the path is returned as is including the last /.
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67 *
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68 * @returns The directory of the current process
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69 */
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70 char * get_install_dir();
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71
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72 #ifdef WIN32
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73 /**@brief Get a copy of the processes owner sid
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74 *
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75 * Copy the SID of the owner of the process hProcess.
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76 *
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77 * The returned sid structure has to be freed with free by the caller
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78 *
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79 * @param[in] hProcess A handle to the process whose user should be obtained.
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80 * The process must have the PROCESS_QUERY_INFORMATION access permission.
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81 *
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82 * @returns A copy of the process owners sid or NULL on error.
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83 */
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84 PSID get_process_owner(HANDLE hProcess);
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85
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86 /**@brief Read (and expand if necessary) a registry string.
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87 *
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88 * Reads a registry string and calls ExpandEnvironmentString
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89 * if necessary on it. Returns a newly allocated string array
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90 * with the expanded registry value converted to UTF-8
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91 *
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92 * Caller has to free return value with free.
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93 *
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94 * @param [in] root the root key (e.g. HKEY_LOCAL_MACHINE)
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95 * @param [in] key the key
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96 * @param [in] name the name of the value to read.
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97 *
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98 * @returns the expanded, null terminated utf-8 string of the value.
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99 * or NULL on error.
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100 */
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101 char * read_registry_string (const HKEY root, const wchar_t *key,
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102 const wchar_t *name);
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103 #endif
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104
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105 #ifdef __cplusplus
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106 }
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107 #endif
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108
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109 #endif // COMMON_UTIL_H
http://wald.intevation.org/projects/trustbridge/