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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Chrome OS firmware/system interface utility
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "crossystem.h"
/* Flags for Param */
#define IS_STRING 0x01 /* String (not present = integer) */
#define CAN_WRITE 0x02 /* Writable (not present = read-only */
#define NO_PRINT_ALL 0x04 /* Don't print contents of parameter when
* doing a print-all */
typedef struct Param {
const char* name; /* Parameter name */
int flags; /* Flags (see above) */
const char* desc; /* Human-readable description */
const char* format; /* Format string, if non-NULL and 0==is_string*/
} Param;
/* List of parameters, terminated with a param with NULL name */
const Param sys_param_list[] = {
{"arch", IS_STRING, "Platform architecture"},
{"backup_nvram_request", CAN_WRITE,
"Backup the nvram somewhere at the next boot. Cleared on success."},
{"battery_cutoff_request", CAN_WRITE,
"Cut off battery and shutdown on next boot"},
{"block_devmode", CAN_WRITE, "Block all use of developer mode"},
{"clear_tpm_owner_done", CAN_WRITE, "Clear TPM owner done"},
{"clear_tpm_owner_request", CAN_WRITE, "Clear TPM owner on next boot"},
{"cros_debug", 0, "OS should allow debug features"},
{"dbg_reset", CAN_WRITE, "Debug reset mode request"},
{"debug_build", 0, "OS image built for debug features"},
{"dev_boot_altfw", CAN_WRITE, "Enable developer mode alternate bootloader"},
{"dev_boot_signed_only", CAN_WRITE,
"Enable developer mode boot only from official kernels"},
{"dev_boot_usb", CAN_WRITE,
"Enable developer mode boot from external disk (USB/SD)"},
{"dev_default_boot", IS_STRING|CAN_WRITE,
"Default boot from disk, altfw or usb"},
{"dev_enable_udc", CAN_WRITE, "Enable USB Device Controller"},
{"devsw_boot", 0, "Developer switch position at boot"},
{"devsw_cur", 0, "Developer switch current position"},
{"diagnostic_request", CAN_WRITE, "Request diagnostic rom run on next boot"},
{"disable_dev_request", CAN_WRITE, "Disable virtual dev-mode on next boot"},
{"ecfw_act", IS_STRING, "Active EC firmware"},
{"post_ec_sync_delay", CAN_WRITE,
"Short delay after EC software sync (persistent, writable, eve only)"},
{"fw_prev_result", IS_STRING, "Firmware result of previous boot"},
{"fw_prev_tried", IS_STRING, "Firmware tried on previous boot (A or B)"},
{"fw_result", IS_STRING|CAN_WRITE, "Firmware result this boot"},
{"fw_tried", IS_STRING, "Firmware tried this boot (A or B)"},
{"fw_try_count", CAN_WRITE, "Number of times to try fw_try_next"},
{"fw_try_next", IS_STRING|CAN_WRITE, "Firmware to try next (A or B)"},
{"fw_vboot2", 0, "1 if firmware was selected by vboot2 or 0 otherwise"},
{"fwb_tries", CAN_WRITE, "Try firmware B count"},
{"fwid", IS_STRING, "Active firmware ID"},
{"fwupdate_tries", CAN_WRITE,
"Times to try OS firmware update (inside kern_nv)"},
{"hwid", IS_STRING, "Hardware ID"},
{"inside_vm", 0, "Running in a VM?"},
{"kern_nv", 0, "Non-volatile field for kernel use", "0x%04x"},
{"kernel_max_rollforward", CAN_WRITE, "Max kernel version to store into TPM",
"0x%08x"},
{"kernkey_vfy", IS_STRING, "Type of verification done on kernel keyblock"},
{"loc_idx", CAN_WRITE, "Localization index for firmware screens"},
{"mainfw_act", IS_STRING, "Active main firmware"},
{"mainfw_type", IS_STRING, "Active main firmware type"},
{"minios_priority", IS_STRING|CAN_WRITE,
"miniOS image to try first (A or B)"},
{"nvram_cleared", CAN_WRITE, "Have NV settings been lost? Write 0 to clear"},
{"display_request", CAN_WRITE, "Should we initialize the display at boot?"},
{"phase_enforcement", 0,
"Board should have full security settings applied"},
{"recovery_reason", 0, "Recovery mode reason for current boot"},
{"recovery_request", CAN_WRITE, "Recovery mode request"},
{"recovery_subcode", CAN_WRITE, "Recovery reason subcode"},
{"recoverysw_boot", 0, "Recovery switch position at boot"},
{"recoverysw_cur", 0, "Recovery switch current position"},
{"recoverysw_ec_boot", 0, "Recovery switch position at EC boot"},
{"ro_fwid", IS_STRING, "Read-only firmware ID"},
{"tpm_attack", CAN_WRITE, "TPM was interrupted since this flag was cleared"},
{"tpm_fwver", 0, "Firmware version stored in TPM", "0x%08x"},
{"tpm_kernver", 0, "Kernel version stored in TPM", "0x%08x"},
{"tpm_rebooted", 0, "TPM requesting repeated reboot"},
{"tried_fwb", 0, "Tried firmware B before A this boot"},
{"try_ro_sync", 0, "try read only software sync"},
{"vdat_flags", 0, "Flags from VbSharedData", "0x%08x"},
{"vdat_lfdebug", IS_STRING|NO_PRINT_ALL,
"LoadFirmware() debug data (not in print-all)"},
{"wipeout_request", CAN_WRITE, "Firmware requested factory reset (wipeout)"},
{"wpsw_cur", 0, "Firmware write protect hardware switch current position"},
/* Terminate with null name */
{NULL, 0, NULL}
};
/* Longest Param name. */
static const int kNameWidth = 23;
/* Print help */
static void PrintHelp(const char *progname) {
const Param *p;
printf("Usage:\n"
" %s [--all]\n"
" Prints all parameters with descriptions and current values.\n"
" If --all is specified, prints even normally hidden fields.\n"
" %s [param1 [param2 [...]]]\n"
" Prints the current value(s) of the parameter(s).\n"
" %s [param1=value1] [param2=value2 [...]]]\n"
" Sets the parameter(s) to the specified value(s).\n"
" %s [param1?value1] [param2?value2 [...]]]\n"
" Checks if the parameter(s) all contain the specified value(s).\n"
" Stops at the first error.\n"
"\n"
"Valid parameters:\n", progname, progname, progname, progname);
for (p = sys_param_list; p->name; p++) {
printf(" %-*s [%s/%s] %s\n", kNameWidth, p->name,
(p->flags & CAN_WRITE) ? "RW" : "RO",
(p->flags & IS_STRING) ? "str" : "int",
p->desc);
}
printf("\n"
"For more information, please see:\n"
"https://chromium.googlesource.com/chromiumos/docs/+/HEAD/"
"os_config.md#crossystem\n");
}
/* Find the parameter in the list.
*
* Returns the parameter, or NULL if no match. */
static const Param* FindParam(const char* name) {
const Param* p;
if (!name)
return NULL;
/* "legacy" term deprecated in favour of "altfw" (see: b/179458327) */
if (!strcasecmp(name, "dev_boot_legacy")) {
fprintf(stderr,
"!!!\n"
"!!! PLEASE USE 'dev_boot_altfw' INSTEAD OF 'dev_boot_legacy'\n"
"!!!\n");
name = "dev_boot_altfw";
}
for (p = sys_param_list; p->name; p++) {
if (!strcasecmp(p->name, name))
return p;
}
return NULL;
}
/* Return code of SetParam() below. */
enum {
PARAM_SUCCESS = 0,
PARAM_ERROR_UNKNOWN,
PARAM_ERROR_READ_ONLY,
PARAM_ERROR_INVALID_INT,
};
/* Set the specified parameter.
*
* Returns PARAM_SUCCESS if success, PARAM_ERROR_* if error. */
static int SetParam(const Param* p, const char* value) {
if (!(p->flags & CAN_WRITE))
return PARAM_ERROR_READ_ONLY;
if (p->flags & IS_STRING) {
return (0 == VbSetSystemPropertyString(p->name, value) ?
0 : PARAM_ERROR_UNKNOWN);
} else {
char* e;
int i = (int)strtol(value, &e, 0);
if (!*value || (e && *e))
return PARAM_ERROR_INVALID_INT;
return (0 == VbSetSystemPropertyInt(p->name, i) ?
0 : PARAM_ERROR_UNKNOWN);
}
}
/* Compares the parameter with the expected value.
*
* Returns 0 if success (match), non-zero if error (mismatch). */
static int CheckParam(const Param* p, const char* expect) {
if (p->flags & IS_STRING) {
char buf[VB_MAX_STRING_PROPERTY];
const char* v = VbGetSystemPropertyString(p->name, buf, sizeof(buf));
if (!v || 0 != strcmp(v, expect))
return 1;
} else {
char* e;
int i = (int)strtol(expect, &e, 0);
int v = VbGetSystemPropertyInt(p->name);
if (!*expect || (e && *e))
return 1;
if (v == -1 || i != v)
return 1;
}
return 0;
}
/* Print the specified parameter.
*
* Returns 0 if success, non-zero if error. */
static int PrintParam(const Param* p) {
if (p->flags & IS_STRING) {
char buf[VB_MAX_STRING_PROPERTY];
const char* v = VbGetSystemPropertyString(p->name, buf, sizeof(buf));
if (!v)
return 1;
printf("%s", v);
} else {
int v = VbGetSystemPropertyInt(p->name);
if (v == -1)
return 1;
printf(p->format ? p->format : "%d", v);
}
return 0;
}
/* Print all parameters with descriptions. If force_all!=0, prints even
* parameters that specify the NO_PRINT_ALL flag.
*
* Returns 0 if success, non-zero if error. */
static int PrintAllParams(int force_all) {
const Param* p;
int retval = 0;
char buf[VB_MAX_STRING_PROPERTY];
const char* value;
for (p = sys_param_list; p->name; p++) {
if (0 == force_all && (p->flags & NO_PRINT_ALL))
continue;
if (p->flags & IS_STRING) {
value = VbGetSystemPropertyString(p->name, buf, sizeof(buf));
} else {
int v = VbGetSystemPropertyInt(p->name);
if (v == -1)
value = NULL;
else {
snprintf(buf, sizeof(buf), p->format ? p->format : "%d", v);
value = buf;
}
}
printf("%-*s = %-30s # [%s/%s] %s\n", kNameWidth, p->name,
(value ? value : "(error)"),
(p->flags & CAN_WRITE) ? "RW" : "RO",
(p->flags & IS_STRING) ? "str" : "int",
p->desc);
}
return retval;
}
int main(int argc, char* argv[]) {
int retval = 0;
int i;
char* progname = strrchr(argv[0], '/');
if (progname)
progname++;
else
progname = argv[0];
/* If no args specified, print all params */
if (argc == 1)
return PrintAllParams(0);
/* --all or -a prints all params including normally hidden ones */
if (!strcasecmp(argv[1], "--all") || !strcmp(argv[1], "-a"))
return PrintAllParams(1);
/* Print help if needed */
if (!strcasecmp(argv[1], "-h") || !strcmp(argv[1], "-?") ||
!strcmp(argv[1], "--help")) {
PrintHelp(progname);
return 0;
}
/* Otherwise, loop through params and get/set them */
for (i = 1; i < argc && retval == 0; i++) {
char* has_set = strchr(argv[i], '=');
char* has_expect = strchr(argv[i], '?');
char* name = strtok(argv[i], "=?");
const char* value = strtok(NULL, "=?");
const Param* p;
/* Make sure args are well-formed. '' or '=foo' or '?foo' not allowed. */
if (!name || has_set == argv[i] || has_expect == argv[i]) {
fprintf(stderr, "Poorly formed parameter\n");
PrintHelp(progname);
return 1;
}
if (!value)
value=""; /* Allow setting/checking an empty string ('foo=' or 'foo?') */
if (has_set && has_expect) {
fprintf(stderr, "Use either = or ? in a parameter, but not both.\n");
PrintHelp(progname);
return 1;
}
/* Find the parameter */
p = FindParam(name);
if (!p) {
fprintf(stderr, "Invalid parameter name: %s\n", name);
PrintHelp(progname);
return 1;
}
if (i > 1)
printf(" "); /* Output params space-delimited */
if (has_set) {
retval = SetParam(p, value);
switch (retval) {
case PARAM_SUCCESS:
break;
case PARAM_ERROR_READ_ONLY:
fprintf(stderr, "Parameter %s is read-only\n", p->name);
break;
case PARAM_ERROR_INVALID_INT:
fprintf(stderr, "Value %s is not a valid integer\n", value);
break;
default:
fprintf(stderr, "Failed to set parameter %s\n", p->name);
break;
}
} else if (has_expect)
retval = CheckParam(p, value);
else
retval = PrintParam(p);
}
return retval;
}