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bootctl: add boot loader and firmware interface tool

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This commit is contained in:
Kay Sievers
2013-02-11 19:35:52 +01:00
parent c937e0d5c5
commit 7b4d7cc082
10 changed files with 869 additions and 4 deletions
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src/shared/efivars.c
+183 -2
View File
@@ -20,14 +20,13 @@
***/
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include "util.h"
#include "utf8.h"
#include "efivars.h"
#define EFI_VENDOR_LOADER SD_ID128_MAKE(4a,67,b0,82,0a,4c,41,cf,b6,c7,44,0b,29,bb,8c,4f)
bool is_efiboot(void) {
return access("/sys/firmware/efi", F_OK) >= 0;
}
@@ -93,6 +92,188 @@ int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, v
return 0;
}
char *efi_get_variable_string(sd_id128_t vendor, const char *name) {
_cleanup_free_ void *s = NULL;
size_t ss;
int err;
err = efi_get_variable(vendor, name, NULL, &s, &ss);
if (err < 0)
return NULL;
return utf16_to_utf8(s, ss);
}
static size_t utf16_size(const uint16_t *s) {
size_t l = 0;
while (s[l] > 0)
l++;
return (l+1) * sizeof(uint16_t);
}
static void efi_guid_to_id128(const void *guid, sd_id128_t *id128) {
struct uuid {
uint32_t u1;
uint16_t u2;
uint16_t u3;
uint8_t u4[8];
} _packed_;
const struct uuid *uuid = guid;
id128->bytes[0] = (uuid->u1 >> 24) & 0xff;
id128->bytes[1] = (uuid->u1 >> 16) & 0xff;
id128->bytes[2] = (uuid->u1 >> 8) & 0xff;
id128->bytes[3] = (uuid->u1) & 0xff;
id128->bytes[4] = (uuid->u2 >> 8) & 0xff;
id128->bytes[5] = (uuid->u2) & 0xff;
id128->bytes[6] = (uuid->u3 >> 8) & 0xff;
id128->bytes[7] = (uuid->u3) & 0xff;
memcpy(&id128->bytes[8], uuid->u4, sizeof(uuid->u4));
}
int efi_get_boot_option(uint32_t id, uint32_t *attributes, char **title, sd_id128_t *part_uuid, char **path, char **data, size_t *data_size) {
struct boot_option {
uint32_t attr;
uint16_t path_len;
uint16_t title[];
} _packed_;
struct drive_path {
uint32_t part_nr;
uint64_t part_start;
uint64_t part_size;
char signature[16];
uint8_t mbr_type;
uint8_t signature_type;
} _packed_;
struct device_path {
uint8_t type;
uint8_t sub_type;
uint16_t length;
union {
uint16_t path[0];
struct drive_path drive;
};
} _packed_;
char boot_id[32];
_cleanup_free_ char *buf = NULL;
size_t l;
struct boot_option *header;
size_t title_size;
char *s = NULL;
char *p = NULL;
sd_id128_t p_uuid = SD_ID128_NULL;
char *d = NULL;
size_t d_size = 0;
int err;
snprintf(boot_id, sizeof(boot_id), "Boot%04X", id);
err = efi_get_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, (void **)&buf, &l);
if (err < 0)
return err;
if (l < sizeof(struct boot_option))
return -ENOENT;
header = (struct boot_option *)buf;
title_size = utf16_size(header->title);
if (title_size > l - offsetof(struct boot_option, title))
return -EINVAL;
s = utf16_to_utf8(header->title, title_size);
if (!s) {
err = -ENOMEM;
goto err;
}
if (header->path_len > 0) {
char *dbuf;
size_t dnext;
dbuf = buf + offsetof(struct boot_option, title) + title_size;
dnext = 0;
while (dnext < header->path_len) {
struct device_path *dpath;
dpath = (struct device_path *)(dbuf + dnext);
if (dpath->length < 4)
break;
/* Type 0x7F – End of Hardware Device Path, Sub-Type 0xFF – End Entire Device Path */
if (dpath->type == 0x7f && dpath->sub_type == 0xff)
break;
dnext += dpath->length;
/* Type 0x04 – Media Device Path */
if (dpath->type != 0x04)
continue;
/* Sub-Type 1 – Hard Drive */
if (dpath->sub_type == 0x01) {
/* 0x02 – GUID Partition Table */
if (dpath->drive.mbr_type != 0x02)
continue;
/* 0x02 – GUID signature */
if (dpath->drive.signature_type != 0x02)
continue;
efi_guid_to_id128(dpath->drive.signature, &p_uuid);
continue;
}
/* Sub-Type 4 – File Path */
if (dpath->sub_type == 0x04) {
p = utf16_to_utf8(dpath->path, dpath->length-4);
continue;
}
}
}
*title = s;
if (part_uuid)
*part_uuid = p_uuid;
if (path)
*path = p;
if (data)
*data = d;
if (data_size)
*data_size = d_size;
return 0;
err:
free(s);
free(p);
free(d);
return err;
}
int efi_get_boot_order(uint16_t **order, size_t *count) {
void *buf;
size_t l;
int err;
err = efi_get_variable(EFI_VENDOR_GLOBAL, "BootOrder", NULL, &buf, &l);
if (err < 0)
return err;
if (l == 0) {
free(buf);
return -ENOENT;
}
if ((l % sizeof(uint16_t) > 0)) {
free(buf);
return -EINVAL;
}
*order = buf;
*count = l / sizeof(uint16_t);
return 0;
}
static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) {
_cleanup_free_ void *i = NULL;
_cleanup_free_ char *j = NULL;
src/shared/efivars.h
+7
View File
@@ -28,9 +28,16 @@
#include "sd-id128.h"
#include "time-util.h"
#define EFI_VENDOR_LOADER SD_ID128_MAKE(4a,67,b0,82,0a,4c,41,cf,b6,c7,44,0b,29,bb,8c,4f)
#define EFI_VENDOR_GLOBAL SD_ID128_MAKE(8b,e4,df,61,93,ca,11,d2,aa,0d,00,e0,98,03,2b,8c)
bool is_efiboot(void);
int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, void **value, size_t *size);
char *efi_get_variable_string(sd_id128_t vendor, const char *name);
int efi_get_boot_option(uint32_t nr, uint32_t *attributes, char **title, sd_id128_t *partuuid, char **path, char **data, size_t *data_size);
int efi_get_boot_order(uint16_t **order, size_t *count);
int efi_get_boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader);
src/shared/utf8.c
+1 -1
View File
@@ -317,6 +317,6 @@ char *utf16_to_utf8(const void *s, size_t length) {
}
*t = 0;
return r;
return r;
}