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
  35 #undef GET_PROGRAM_NAME
  36
  37 #if DETECT_OS_WINDOWS
  38 #include <windows.h>
  39 #else
  40 #include <unistd.h>
  41 #endif
  42
  43 #if defined(__linux__) && defined(HAVE_PROGRAM_INVOCATION_NAME)
  44
  45 static char *path = NULL;
  46
  47 static void __freeProgramPath()
  48 {
  49    free(path);
  50    path = NULL;
  51 }
  52
  53 static const char *
  54 __getProgramName()
  55 {
  56    char * arg = strrchr(program_invocation_name, '/');
  57    if (arg) {
  58       /* If the / character was found this is likely a linux path or
  59        * an invocation path for a 64-bit wine program.
  60        *
  61        * However, some programs pass command line arguments into argv[0].
  62        * Strip these arguments out by using the realpath only if it was
  63        * a prefix of the invocation name.
  64        */
  65       if (!path) {
  66          path = realpath("/proc/self/exe", NULL);
  67          atexit(__freeProgramPath);
  68       }
  69
  70       if (path && strncmp(path, program_invocation_name, strlen(path)) == 0) {
  71          /* This shouldn't be null because path is a a prefix,
  72           * but check it anyway since path is static. */
  73          char * name = strrchr(path, '/');
  74          if (name)
  75             return name + 1;
  76       }
  77
  78       return arg+1;
  79    }
  80
  81    /* If there was no '/' at all we likely have a windows like path from
  82     * a wine application.
  83     */
  84    arg = strrchr(program_invocation_name, '\\');
  85    if (arg)
  86       return arg+1;
  87
  88    return program_invocation_name;
  89 }
  90 #    define GET_PROGRAM_NAME() __getProgramName()
  91 #elif defined(HAVE_PROGRAM_INVOCATION_NAME)
  92 #    define GET_PROGRAM_NAME() program_invocation_short_name
  93 #elif defined(__FreeBSD__) && (__FreeBSD__ >= 2)
  94 #    include <osreldate.h>
  95 #    if (__FreeBSD_version >= 440000)
  96 #        define GET_PROGRAM_NAME() getprogname()
  97 #    endif
  98 #elif defined(__NetBSD__)
  99 #    include <sys/param.h>
 100 #    if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 106000100)
 101 #        define GET_PROGRAM_NAME() getprogname()
 102 #    endif
 103 #elif defined(__DragonFly__)
 104 #    define GET_PROGRAM_NAME() getprogname()
 105 #elif defined(__APPLE__)
 106 #    define GET_PROGRAM_NAME() getprogname()
 107 #elif defined(ANDROID)
 108 #    define GET_PROGRAM_NAME() getprogname()
 109 #elif defined(__sun)
 110 /* Solaris has getexecname() which returns the full path - return just
 111    the basename to match BSD getprogname() */
 112 #    include <libgen.h>
 113
 114 static const char *
 115 __getProgramName()
 116 {
 117     static const char *progname;
 118
 119     if (progname == NULL) {
 120         const char *e = getexecname();
 121         if (e != NULL) {
 122             /* Have to make a copy since getexecname can return a readonly
 123                string, but basename expects to be able to modify its arg. */
 124             char *n = strdup(e);
 125             if (n != NULL) {
 126                 progname = basename(n);
 127             }
 128         }
 129     }
 130     return progname;
 131 }
 132
 133 #    define GET_PROGRAM_NAME() __getProgramName()
 134 #endif
 135
 136 #if !defined(GET_PROGRAM_NAME)
 137 #    if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__UCLIBC__) || defined(ANDROID)
 138 /* This is a hack. It's said to work on OpenBSD, NetBSD and GNU.
 139  * Rogelio M.Serrano Jr. reported it's also working with UCLIBC. It's
 140  * used as a last resort, if there is no documented facility available. */
 141 static const char *
 142 __getProgramName()
 143 {
 144     extern const char *__progname;
 145     char * arg = strrchr(__progname, '/');
 146     if (arg)
 147         return arg+1;
 148     else
 149         return __progname;
 150 }
 151 #        define GET_PROGRAM_NAME() __getProgramName()
 152 #    else
 153 #        define GET_PROGRAM_NAME() ""
 154 #        pragma message ( "Warning: Per application configuration won't work with your OS version." )
 155 #    endif
 156 #endif
 157
 158 const char *
 159 util_get_process_name(void)
 160 {
 161    return GET_PROGRAM_NAME();
 162 }
 163
 164 size_t
 165 util_get_process_exec_path(char* process_path, size_t len)
 166 {
 167 #if DETECT_OS_WINDOWS
 168    return GetModuleFileNameA(NULL, process_path, len);
 169 #elif DETECT_OS_UNIX
 170    ssize_t r;
 171
 172    if ((r = readlink("/proc/self/exe", process_path, len)) > 0)
 173       goto success;
 174    if ((r = readlink("/proc/curproc/exe", process_path, len)) > 0)
 175       goto success;
 176    if ((r = readlink("/proc/curproc/file", process_path, len)) > 0)
 177       goto success;
 178
 179     return 0;
 180 success:
 181     process_path[r] = '\0';
 182     return r;
 183
 184 #endif
 185    return 0;
 186 }