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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* uefi vars device - helper functions for ucs2 strings and tracing
*/
#include "qemu/osdep.h"
#include "system/dma.h"
#include "hw/uefi/var-service.h"
#include "trace/trace-hw_uefi.h"
/* ------------------------------------------------------------------ */
/*
* string helper functions.
*
* Most of the time uefi ucs2 strings are NULL-terminated, except
* sometimes when they are not (for example in variable policies).
*/
gboolean uefi_str_is_valid(const uint16_t *str, size_t len,
gboolean must_be_null_terminated)
{
size_t pos = 0;
for (;;) {
if (pos == len) {
if (must_be_null_terminated) {
return false;
} else {
return true;
}
}
switch (str[pos]) {
case 0:
/* end of string */
return true;
case 0xd800 ... 0xdfff:
/* reject surrogates */
return false;
default:
/* char is good, check next */
break;
}
pos++;
}
}
size_t uefi_strlen(const uint16_t *str, size_t len)
{
size_t pos = 0;
for (;;) {
if (pos == len) {
return pos;
}
if (str[pos] == 0) {
return pos;
}
pos++;
}
}
gboolean uefi_str_equal_ex(const uint16_t *a, size_t alen,
const uint16_t *b, size_t blen,
gboolean wildcards_in_a)
{
size_t pos = 0;
alen = alen / 2;
blen = blen / 2;
for (;;) {
if (pos == alen && pos == blen) {
return true;
}
if (pos == alen && b[pos] == 0) {
return true;
}
if (pos == blen && a[pos] == 0) {
return true;
}
if (pos == alen || pos == blen) {
return false;
}
if (a[pos] == 0 && b[pos] == 0) {
return true;
}
if (wildcards_in_a && a[pos] == '#') {
if (!isxdigit(b[pos])) {
return false;
}
} else {
if (a[pos] != b[pos]) {
return false;
}
}
pos++;
}
}
gboolean uefi_str_equal(const uint16_t *a, size_t alen,
const uint16_t *b, size_t blen)
{
return uefi_str_equal_ex(a, alen, b, blen, false);
}
char *uefi_ucs2_to_ascii(const uint16_t *ucs2, uint64_t ucs2_size)
{
char *str = g_malloc0(ucs2_size / 2 + 1);
int i;
for (i = 0; i * 2 < ucs2_size; i++) {
if (ucs2[i] == 0) {
break;
}
if (ucs2[i] < 128) {
str[i] = ucs2[i];
} else {
str[i] = '?';
}
}
str[i] = 0;
return str;
}
/* ------------------------------------------------------------------ */
/* time helper functions */
int uefi_time_compare(efi_time *a, efi_time *b)
{
if (a->year < b->year) {
return -1;
}
if (a->year > b->year) {
return 1;
}
if (a->month < b->month) {
return -1;
}
if (a->month > b->month) {
return 1;
}
if (a->day < b->day) {
return -1;
}
if (a->day > b->day) {
return 1;
}
if (a->hour < b->hour) {
return -1;
}
if (a->hour > b->hour) {
return 1;
}
if (a->minute < b->minute) {
return -1;
}
if (a->minute > b->minute) {
return 1;
}
if (a->second < b->second) {
return -1;
}
if (a->second > b->second) {
return 1;
}
if (a->nanosecond < b->nanosecond) {
return -1;
}
if (a->nanosecond > b->nanosecond) {
return 1;
}
return 0;
}
/* ------------------------------------------------------------------ */
/* tracing helper functions */
void uefi_trace_variable(const char *action, QemuUUID guid,
const uint16_t *name, uint64_t name_size)
{
QemuUUID be = qemu_uuid_bswap(guid);
char *str_uuid = qemu_uuid_unparse_strdup(&be);
char *str_name = uefi_ucs2_to_ascii(name, name_size);
trace_uefi_variable(action, str_name, name_size, str_uuid);
g_free(str_name);
g_free(str_uuid);
}
void uefi_trace_status(const char *action, efi_status status)
{
switch (status) {
case EFI_SUCCESS:
trace_uefi_status(action, "success");
break;
case EFI_INVALID_PARAMETER:
trace_uefi_status(action, "invalid parameter");
break;
case EFI_UNSUPPORTED:
trace_uefi_status(action, "unsupported");
break;
case EFI_BAD_BUFFER_SIZE:
trace_uefi_status(action, "bad buffer size");
break;
case EFI_BUFFER_TOO_SMALL:
trace_uefi_status(action, "buffer too small");
break;
case EFI_WRITE_PROTECTED:
trace_uefi_status(action, "write protected");
break;
case EFI_OUT_OF_RESOURCES:
trace_uefi_status(action, "out of resources");
break;
case EFI_NOT_FOUND:
trace_uefi_status(action, "not found");
break;
case EFI_ACCESS_DENIED:
trace_uefi_status(action, "access denied");
break;
case EFI_ALREADY_STARTED:
trace_uefi_status(action, "already started");
break;
case EFI_SECURITY_VIOLATION:
trace_uefi_status(action, "security violation");
break;
default:
trace_uefi_status(action, "unknown error");
break;
}
}
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