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// SPDX-License-Identifier: BSD-2-Clause-Patent
/*
* sbat.c - parse SBAT data from the .sbat section data
*/
#include "shim.h"
CHAR8 *
get_sbat_field(CHAR8 *current, CHAR8 *end, const CHAR8 ** field, char delim)
{
CHAR8 *offset;
if (!field || !current || !end || current >= end)
return NULL;
offset = strchrnula(current, delim);
*field = current;
if (!*offset)
return NULL;
*offset = '\0';
return offset + 1;
}
EFI_STATUS parse_sbat_entry(CHAR8 **current, CHAR8 *end,
struct sbat_entry **sbat_entry)
{
struct sbat_entry *entry = NULL;
entry = AllocateZeroPool(sizeof(*entry));
if (!entry)
return EFI_OUT_OF_RESOURCES;
*current = get_sbat_field(*current, end, &entry->component_name, ',');
if (!entry->component_name)
goto error;
*current = get_sbat_field(*current, end, &entry->component_generation,',');
if (!entry->component_generation)
goto error;
*current = get_sbat_field(*current, end, &entry->vendor_name,',');
if (!entry->vendor_name)
goto error;
*current = get_sbat_field(*current, end, &entry->vendor_package_name, ',');
if (!entry->vendor_package_name)
goto error;
*current = get_sbat_field(*current, end, &entry->vendor_version,',');
if (!entry->vendor_version)
goto error;
*current = get_sbat_field(*current, end, &entry->vendor_url,'\n');
if (!entry->vendor_url)
goto error;
*sbat_entry = entry;
return EFI_SUCCESS;
error:
FreePool(entry);
return EFI_INVALID_PARAMETER;
}
EFI_STATUS parse_sbat(char *sbat_base, size_t sbat_size, char *buffer,
struct sbat *sbat)
{
CHAR8 *current = (CHAR8 *) sbat_base;
CHAR8 *end = (CHAR8 *) sbat_base + sbat_size;
EFI_STATUS efi_status = EFI_SUCCESS;
struct sbat_entry *entry;
struct sbat_entry **entries;
unsigned int i;
while ((*current == '\r' || *current == '\n') && current < end)
current++;
if (current == end)
return EFI_INVALID_PARAMETER;
while ((*end == '\r' || *end == '\n') && end < current)
end--;
*(end - 1) = '\0';
do {
entry = NULL;
efi_status = parse_sbat_entry(¤t, end, &entry);
if (EFI_ERROR(efi_status))
goto error;
if (end < current) {
efi_status = EFI_INVALID_PARAMETER;
goto error;
}
if (entry) {
entries = ReallocatePool(sbat->entries,
sbat->size * sizeof(entry),
(sbat->size + 1) * sizeof(entry));
if (!entries) {
efi_status = EFI_OUT_OF_RESOURCES;
goto error;
}
sbat->entries = entries;
sbat->entries[sbat->size] = entry;
sbat->size++;
}
} while (entry && *current != '\0');
return efi_status;
error:
perror(L"Failed to parse SBAT data: %r\n", efi_status);
for (i = 0; i < sbat->size; i++)
FreePool(sbat->entries[i]);
return efi_status;
}
// vim:fenc=utf-8:tw=75:noet
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