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/* SPDX-License-Identifier: MIT
* Copyright (c) 2022-2026 Leah Rowe <leah@libreboot.org>
*
* State machine (singleton) for nvmutil data.
*/
#ifdef __OpenBSD__
#include <sys/param.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../include/common.h"
struct xstate *
xstart(int argc, char *argv[])
{
static int first_run = 1;
static int pre_init = 0;
static struct xstate us = {
/* DO NOT MESS THIS UP, OR THERE WILL BE DEMONS */
{
{
CMD_DUMP, "dump", cmd_helper_dump, ARGC_3,
ARG_NOPART,
SKIP_CHECKSUM_READ, SKIP_CHECKSUM_WRITE,
NVM_SIZE, O_RDONLY
}, {
CMD_SETMAC, "setmac", cmd_helper_setmac, ARGC_3,
ARG_NOPART,
CHECKSUM_READ, CHECKSUM_WRITE,
NVM_SIZE, O_RDWR
}, {
CMD_SWAP, "swap", cmd_helper_swap, ARGC_3,
ARG_NOPART,
CHECKSUM_READ, SKIP_CHECKSUM_WRITE,
GBE_PART_SIZE, O_RDWR
}, {
CMD_COPY, "copy", cmd_helper_copy, ARGC_4,
ARG_PART,
CHECKSUM_READ, SKIP_CHECKSUM_WRITE,
GBE_PART_SIZE, O_RDWR
}, {
CMD_CAT, "cat", cmd_helper_cat, ARGC_3,
ARG_NOPART,
CHECKSUM_READ, SKIP_CHECKSUM_WRITE,
GBE_PART_SIZE, O_RDONLY
}, {
CMD_CAT16, "cat16", cmd_helper_cat16, ARGC_3,
ARG_NOPART,
CHECKSUM_READ, SKIP_CHECKSUM_WRITE,
GBE_PART_SIZE, O_RDONLY
}, {
CMD_CAT128, "cat128", cmd_helper_cat128, ARGC_3,
ARG_NOPART,
CHECKSUM_READ, SKIP_CHECKSUM_WRITE,
GBE_PART_SIZE, O_RDONLY
}
},
/* ->mac */
{NULL, "xx:xx:xx:xx:xx:xx", {0, 0, 0}}, /* .str, .rmac, .mac_buf */
/* .f */
{0},
/* .argv0 (for our getprogname implementation) */
NULL,
/* ->i (index to cmd[]) */
0,
/* .no_cmd (set 0 when a command is found) */
1,
/* .cat (cat helpers set this) */
-1
};
if (!first_run) {
if (pre_init)
err_no_cleanup(ECANCELED,
"Outside access to state during init");
first_run = 0;
return &us;
}
if (argc < 3)
err_no_cleanup(EINVAL, "xstart: Too few arguments");
if (argv == NULL)
err_no_cleanup(EINVAL, "xstart: NULL argv");
first_run = 0;
pre_init = 1;
us.f.buf = us.f.real_buf;
us.argv0 = argv[0];
us.f.fname = argv[1];
if (new_tmpfile(&us.f.tmp_fd, &us.f.tname) < 0)
err_no_cleanup(errno, "xstart: cannot create tmpfile");
/* parse user command */
/* TODO: CHECK ACCESSES VIA xstatus() */
set_cmd(argc, argv);
set_cmd_args(argc, argv);
if (us.f.tname == NULL)
err_no_cleanup(errno, "x->f.tname null");
if (*us.f.tname == '\0')
err_no_cleanup(errno, "x->f.tname empty");
if (fstat(us.f.tmp_fd, &us.f.tmp_st) < 0)
err_no_cleanup(errno, "%s: stat", us.f.tname);
memset(us.f.real_buf, 0, sizeof(us.f.real_buf));
memset(us.f.bufcmp, 0, sizeof(us.f.bufcmp));
/* for good measure */
memset(us.f.pad, 0, sizeof(us.f.pad));
pre_init = 0;
return &us;
}
struct xstate *
xstatus(void)
{
struct xstate *x = xstart(0, NULL);
if (x == NULL)
err_no_cleanup(EACCES, "NULL pointer to xstate");
sanitize_command_list();
return x;
}
void
err(int nvm_errval, const char *msg, ...)
{
struct xstate *x = xstatus();
va_list args;
if (errno == 0)
errno = nvm_errval;
if (!errno)
errno = ECANCELED;
(void)exit_cleanup();
if (x != NULL)
fprintf(stderr, "%s: ", getnvmprogname());
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, ": %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
const char *
getnvmprogname(void)
{
struct xstate *x = xstatus();
const char *p;
static char fallback[] = "nvmutil";
char *rval = fallback;
if (x != NULL) {
if (x->argv0 == NULL || *x->argv0 == '\0')
return "";
rval = x->argv0;
}
p = strrchr(rval, '/');
if (p)
return p + 1;
else
return rval;
}
int
exit_cleanup(void)
{
struct xstate *x = xstatus();
struct xfile *f;
int close_err;
int saved_errno;
close_err = 0;
saved_errno = errno;
if (x != NULL) {
f = &x->f;
if (f->gbe_fd > -1) {
if (close_on_eintr(f->gbe_fd) == -1) {
f->gbe_fd = -1;
close_err = 1;
}
f->gbe_fd = -1;
}
if (f->tmp_fd > -1) {
if (close_on_eintr(f->tmp_fd) == -1) {
f->tmp_fd = -1;
close_err = 1;
}
f->tmp_fd = -1;
}
if (f->tname != NULL) {
if (unlink(f->tname) == -1)
close_err = 1;
}
f->tmp_fd = -1;
}
if (saved_errno)
errno = saved_errno;
if (close_err)
return -1;
return 0;
}
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