mirror of
https://git.kernel.org/pub/scm/bluetooth/bluez.git
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133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2015 Intel Corporation. All rights reserved.
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*
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/uio.h>
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#include "peripheral/efivars.h"
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#define SYSFS_EFIVARS "/sys/firmware/efi/efivars"
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typedef struct {
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uint32_t data1;
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uint16_t data2;
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uint16_t data3;
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uint8_t data4[8];
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} efi_guid_t;
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#define VENDOR_GUID \
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(efi_guid_t) { 0xd5f9d775, 0x1a09, 0x4e89, \
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{ 0x96, 0xcf, 0x1d, 0x19, 0x55, 0x4d, 0xa6, 0x67 } }
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static void efivars_pathname(const char *name, char *pathname, size_t size)
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{
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static efi_guid_t guid = VENDOR_GUID;
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snprintf(pathname, size - 1,
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"%s/%s-%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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SYSFS_EFIVARS, name, guid.data1, guid.data2, guid.data3,
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guid.data4[0], guid.data4[1], guid.data4[2], guid.data4[3],
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guid.data4[4], guid.data4[5], guid.data4[6], guid.data4[7]);
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}
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int efivars_read(const char *name, uint32_t *attributes,
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void *data, size_t size)
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{
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char pathname[PATH_MAX];
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struct iovec iov[2];
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uint32_t attr;
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ssize_t len;
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int fd;
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efivars_pathname(name, pathname, PATH_MAX);
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fd = open(pathname, O_RDONLY | O_CLOEXEC);
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if (fd < 0)
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return -EIO;
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iov[0].iov_base = &attr;
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iov[0].iov_len = sizeof(attr);
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iov[1].iov_base = data;
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iov[1].iov_len = size;
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len = readv(fd, iov, 2);
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close(fd);
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if (len < 0)
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return -EIO;
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if (attributes)
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*attributes = attr;
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return 0;
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}
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int efivars_write(const char *name, uint32_t attributes,
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const void *data, size_t size)
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{
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char pathname[PATH_MAX];
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void *buf;
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ssize_t written;
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int fd;
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efivars_pathname(name, pathname, PATH_MAX);
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buf = malloc(size + sizeof(attributes));
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if (!buf)
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return -ENOMEM;
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fd = open(pathname, O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC,
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S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
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if (fd < 0) {
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free(buf);
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return -EIO;
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}
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memcpy(buf, &attributes, sizeof(attributes));
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memcpy(buf + sizeof(attributes), data, size);
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written = write(fd, buf, size + sizeof(attributes));
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close(fd);
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free(buf);
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if (written < 0)
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return -EIO;
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return 0;
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}
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