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/*
* Copyright (c) 2019, Linaro Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* 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 HOLDER 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 <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "translate.h"
#define READONLY_PATH "/readonly/firmware/image/"
#define READWRITE_PATH "/readwrite/"
#ifndef ANDROID
#define FIRMWARE_BASE "/lib/firmware/"
#else
#define FIRMWARE_BASE "/vendor/firmware/"
#endif
/**
* translate_readonly() - open "file" residing with remoteproc firmware
* @file: file requested, stripped of "/readonly/image/" prefix
*
* It is assumed that the readonly files requested by the client resides under
* /lib/firmware in the same place as its associated remoteproc firmware. This
* function scans through all entries under /sys/class/remoteproc and read the
* dirname of each "firmware" file in an attempt to find, and open(2), the
* requested file.
*
* As these files are readonly, it's not possible to pass flags to open(2).
*
* Return: opened fd on success, -1 otherwise
*/
static int translate_readonly(const char *file)
{
char firmware_value[PATH_MAX];
char firmware_attr[PATH_MAX];
char path[PATH_MAX];
struct dirent *de;
int firmware_fd;
DIR *class_dir;
int class_fd;
ssize_t n;
int fd = -1;
class_fd = open("/sys/class/remoteproc", O_RDONLY | O_DIRECTORY);
if (class_fd < 0) {
warn("failed to open remoteproc class");
return -1;
}
class_dir = fdopendir(class_fd);
if (!class_dir) {
warn("failed to opendir");
goto close_class;
}
while ((de = readdir(class_dir)) != NULL) {
if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
continue;
if (strlen(de->d_name) + strlen("/firmware") > sizeof(firmware_attr))
continue;
strcpy(firmware_attr, de->d_name);
strcat(firmware_attr, "/firmware");
firmware_fd = openat(class_fd, firmware_attr, O_RDONLY);
if (firmware_fd < 0)
continue;
n = read(firmware_fd, firmware_value, sizeof(firmware_value));
close(firmware_fd);
if (n < 0) {
continue;
}
firmware_value[n] = 0;
if (strlen(FIRMWARE_BASE) + strlen(firmware_value) + 1 +
strlen(file) + 1 > sizeof(path))
continue;
strcpy(path, FIRMWARE_BASE);
strcat(path, dirname(firmware_value));
strcat(path, "/");
strcat(path, file);
fd = open(path, O_RDONLY);
if (fd >= 0)
break;
if (errno != ENOENT)
warn("failed to open %s", path);
}
closedir(class_dir);
close_class:
close(class_fd);
return fd;
}
/**
* translate_readwrite() - open "file" from a temporary directory
* @file: relative path of the requested file, with /readwrite/ stripped
* @flags: flags to be passed to open(2)
*
* Return: opened fd on success, -1 otherwise
*/
static int translate_readwrite(const char *file, int flags)
{
int base;
int ret;
int fd;
#ifndef ANDROID
ret = mkdir("/tmp/tqftpserv", 0700);
if (ret < 0 && errno != EEXIST) {
warn("failed to create /tmp/tqftpserv");
return -1;
}
base = open("/tmp/tqftpserv", O_RDONLY | O_DIRECTORY);
if (base < 0) {
warn("failed top open /tmp/tqftpserv");
return -1;
}
#else
ret = mkdir("/data/vendor/tmp/tqftpserv", 0700);
if (ret < 0 && errno != EEXIST) {
warn("failed to create /data/vendor/tmp/tqftpserv");
return -1;
}
base = open("/data/vendor/tmp/tqftpserv", O_RDONLY | O_DIRECTORY);
if (base < 0) {
warn("failed top open /data/vendor/tmp/tqftpserv");
return -1;
}
#endif
fd = openat(base, file, flags, 0600);
close(base);
if (fd < 0)
warn("failed to open %s", file);
return fd;
}
/**
* translate_open() - open file after translating path
*
* Strips /readonly/firmware/image and search among remoteproc firmware.
* Replaces /readwrite with a temporary directory.
*/
int translate_open(const char *path, int flags)
{
if (!strncmp(path, READONLY_PATH, strlen(READONLY_PATH)))
return translate_readonly(path + strlen(READONLY_PATH));
else if (!strncmp(path, READWRITE_PATH, strlen(READWRITE_PATH)))
return translate_readwrite(path + strlen(READWRITE_PATH), flags);
fprintf(stderr, "invalid path %s, rejecting\n", path);
errno = ENOENT;
return -1;
}
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