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#include "bootmgr.h"
#include "efi_helper.h"
#include "common/io.h"
#ifdef __OpenBSD__
#include <dev/efi/efiio.h>
#else
#include <sys/efiio.h>
#endif
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdalign.h>
#ifdef __NetBSD__
typedef uint16_t efi_char;
#endif
#ifndef EFI_GLOBAL_VARIABLE
#define EFI_GLOBAL_VARIABLE { 0x8be4df61, 0x93ca, 0x11d2, 0xaa, 0x0d, { 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c } }
#endif
const char* ffDetectBootmgr(FFBootmgrResult* result) {
FF_AUTO_CLOSE_FD int efifd = open("/dev/efi", O_RDWR | O_CLOEXEC);
if (efifd < 0) {
return "open(/dev/efi) failed";
}
alignas(uint16_t) uint8_t buffer[2048];
struct efi_var_ioc ioc = {
.vendor = EFI_GLOBAL_VARIABLE,
.data = buffer,
};
ioc.datasize = sizeof(buffer);
ioc.name = (efi_char[]) { 'B', 'o', 'o', 't', 'C', 'u', 'r', 'r', 'e', 'n', 't', '\0' };
ioc.namesize = sizeof("BootCurrent") * 2;
if (ioctl(efifd, EFIIOC_VAR_GET, &ioc) < 0 || ioc.datasize != 2) {
return "ioctl(EFIIOC_VAR_GET, BootCurrent) failed";
}
result->order = *(uint16_t*) buffer;
unsigned char hex[5];
snprintf((char*) hex, sizeof(hex), "%04X", result->order);
ioc.datasize = sizeof(buffer);
ioc.name = (efi_char[]) { 'B', 'o', 'o', 't', hex[0], hex[1], hex[2], hex[3], '\0' };
ioc.namesize = sizeof("Boot####") * 2;
if (ioctl(efifd, EFIIOC_VAR_GET, &ioc) < 0 || ioc.datasize == sizeof(buffer)) {
return "ioctl(EFIIOC_VAR_GET, Boot####) failed";
}
ffEfiFillLoadOption((FFEfiLoadOption*) buffer, result);
ioc.name = (efi_char[]) { 'S', 'e', 'c', 'u', 'r', 'e', 'B', 'o', 'o', 't', '\0' };
ioc.namesize = sizeof("SecureBoot") * 2;
ioc.datasize = sizeof(buffer);
if (ioctl(efifd, EFIIOC_VAR_GET, &ioc) == 0 && ioc.datasize == 1) {
result->secureBoot = !!buffer[0];
}
return NULL;
}
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