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/*
* Copyright (C) 2017 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "private/__bionic_get_shell_path.h"
#include <errno.h>
#include <string.h>
#include <sys/cdefs.h>
#include <unistd.h>
#define VENDOR_PREFIX "/vendor/"
static const char* init_sh_path() {
/* If the device is not treble enabled, return the path to the system shell.
* Vendor code, on non-treble enabled devices could use system() / popen()
* with relative paths for executables on /system. Since /system will not be
* in $PATH for the vendor shell, simply return the system shell.
*/
#ifdef TREBLE_LINKER_NAMESPACES
/* look for /system or /vendor prefix */
char exe_path[strlen(VENDOR_PREFIX)];
ssize_t len = readlink("/proc/self/exe", exe_path, sizeof(exe_path));
if (len != -1 && !strncmp(exe_path, VENDOR_PREFIX, strlen(VENDOR_PREFIX))) {
return "/vendor/bin/sh";
}
#endif
return "/system/bin/sh";
}
const char* __bionic_get_shell_path() {
static const char* sh_path = init_sh_path();
return sh_path;
}
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