src/util/u_process.c

   1 /*
   2  * Copyright © 2003 Felix Kuehling
   3  * Copyright © 2018 Advanced Micro Devices, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining
   7  * a copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  15  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  16  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  17  * NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS, AUTHORS
  18  * AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * The above copyright notice and this permission notice (including the
  24  * next paragraph) shall be included in all copies or substantial portions
  25  * of the Software.
  26  */
  27
  28 #include "u_process.h"
  29 #include "detect_os.h"
  30 #include "macros.h"
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <stdlib.h>
  34 #include <unistd.h>
  35
  36 #undef GET_PROGRAM_NAME
  37
  38 #if DETECT_OS_WINDOWS
  39 #include <windows.h>
  40 #endif
  41
  42 #if defined(__linux__) && defined(HAVE_PROGRAM_INVOCATION_NAME)
  43
  44 static char *path = NULL;
  45
  46 static void __freeProgramPath()
  47 {
  48    free(path);
  49    path = NULL;
  50 }
  51
  52 static const char *
  53 __getProgramName()
  54 {
  55    char * arg = strrchr(program_invocation_name, '/');
  56    if (arg) {
  57       /* If the / character was found this is likely a linux path or
  58        * an invocation path for a 64-bit wine program.
  59        *
  60        * However, some programs pass command line arguments into argv[0].
  61        * Strip these arguments out by using the realpath only if it was
  62        * a prefix of the invocation name.
  63        */
  64       if (!path) {
  65          path = realpath("/proc/self/exe", NULL);
  66          atexit(__freeProgramPath);
  67       }
  68
  69       if (path && strncmp(path, program_invocation_name, strlen(path)) == 0) {
  70          /* This shouldn't be null because path is a a prefix,
  71           * but check it anyway since path is static. */
  72          char * name = strrchr(path, '/');
  73          if (name)
  74             return name + 1;
  75       }
  76
  77       return arg+1;
  78    }
  79
  80    /* If there was no '/' at all we likely have a windows like path from
  81     * a wine application.
  82     */
  83    arg = strrchr(program_invocation_name, '\\');
  84    if (arg)
  85       return arg+1;
  86
  87    return program_invocation_name;
  88 }
  89 #    define GET_PROGRAM_NAME() __getProgramName()
  90 #elif defined(HAVE_PROGRAM_INVOCATION_NAME)
  91 #    define GET_PROGRAM_NAME() program_invocation_short_name
  92 #elif defined(__FreeBSD__) && (__FreeBSD__ >= 2)
  93 #    include <osreldate.h>
  94 #    if (__FreeBSD_version >= 440000)
  95 #        define GET_PROGRAM_NAME() getprogname()
  96 #    endif
  97 #elif defined(__NetBSD__)
  98 #    include <sys/param.h>
  99 #    if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 106000100)
 100 #        define GET_PROGRAM_NAME() getprogname()
 101 #    endif
 102 #elif defined(__DragonFly__)
 103 #    define GET_PROGRAM_NAME() getprogname()
 104 #elif defined(__APPLE__)
 105 #    define GET_PROGRAM_NAME() getprogname()
 106 #elif defined(ANDROID)
 107 #    define GET_PROGRAM_NAME() getprogname()
 108 #elif defined(__sun)
 109 /* Solaris has getexecname() which returns the full path - return just
 110    the basename to match BSD getprogname() */
 111 #    include <libgen.h>
 112
 113 static const char *
 114 __getProgramName()
 115 {
 116     static const char *progname;
 117
 118     if (progname == NULL) {
 119         const char *e = getexecname();
 120         if (e != NULL) {
 121             /* Have to make a copy since getexecname can return a readonly
 122                string, but basename expects to be able to modify its arg. */
 123             char *n = strdup(e);
 124             if (n != NULL) {
 125                 progname = basename(n);
 126             }
 127         }
 128     }
 129     return progname;
 130 }
 131
 132 #    define GET_PROGRAM_NAME() __getProgramName()
 133 #endif
 134
 135 #if !defined(GET_PROGRAM_NAME)
 136 #    if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__UCLIBC__) || defined(ANDROID)
 137 /* This is a hack. It's said to work on OpenBSD, NetBSD and GNU.
 138  * Rogelio M.Serrano Jr. reported it's also working with UCLIBC. It's
 139  * used as a last resort, if there is no documented facility available. */
 140 static const char *
 141 __getProgramName()
 142 {
 143     extern const char *__progname;
 144     char * arg = strrchr(__progname, '/');
 145     if (arg)
 146         return arg+1;
 147     else
 148         return __progname;
 149 }
 150 #        define GET_PROGRAM_NAME() __getProgramName()
 151 #    else
 152 #        define GET_PROGRAM_NAME() ""
 153 #        pragma message ( "Warning: Per application configuration won't work with your OS version." )
 154 #    endif
 155 #endif
 156
 157 const char *
 158 util_get_process_name(void)
 159 {
 160    return GET_PROGRAM_NAME();
 161 }
 162
 163 size_t
 164 util_get_process_exec_path(char* process_path, size_t len)
 165 {
 166 #if DETECT_OS_WINDOWS
 167    return GetModuleFileNameA(NULL, process_path, len);
 168 #elif DETECT_OS_UNIX
 169    ssize_t r;
 170
 171    if ((r = readlink("/proc/self/exe", process_path, len)) > 0)
 172       goto success;
 173    if ((r = readlink("/proc/curproc/exe", process_path, len)) > 0)
 174       goto success;
 175    if ((r = readlink("/proc/curproc/file", process_path, len)) > 0)
 176       goto success;
 177
 178     return 0;
 179 success:
 180     process_path[r] = '\0';
 181     return r;
 182
 183 #endif
 184    return 0;
 185 }