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/* SPDX-License-Identifier: MIT
*
* Copyright (c) 2022-2026 Leah Rowe <leah@libreboot.org>
*
* This tool lets you modify Intel GbE NVM (Gigabit Ethernet
* Non-Volatile Memory) images, e.g. change the MAC address.
* These images configure your Intel Gigabit Ethernet adapter.
*
* This code is designed to be portable, running on as many
* Unix and Unix-like systems as possible (mainly BSD/Linux).
*
* Recommended CFLAGS for Clang/GCC:
*
* -Os -Wall -Wextra -Werror -pedantic -std=c90
*/
#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 <time.h>
#include <unistd.h>
#include "../include/common.h"
/*
* Program state/command table
* Default config stored here,
* and copied to a newly allocated
* buffer in memory, then the pointer
* is passed. The rest of the program
* will manipulate this data.
*/
/*
TODO:
eventually, i will not have this return
a pointer at all. instead, a similar key
mechanism will be used for other access
functions e.g. word/set_word, err(needs
to clean up), and so on. then those
would return values if already initialised,
but would not permit additional init - will
decide exactly how to implement this at a
later state.
this is part of an ongoing effort to introduce
extreme memory safety into this program.
*/
struct xstate *
xstatus(void)
{
static int first_run = 1;
static struct xstate us = {
/* .cmd (update cmd[] in the struct if adding to it)
DO NOT FORGET. or C will init zeroes/NULLs */
/* cmd[] members */
/* DO NOT MESS THIS UP */
/* items must be set *exactly* */
{
{
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,
/* .xsize (size of the stuct will be stored here later) */
0,
/* .cat (cat helpers set this) */
-1
};
if (!first_run)
return &us;
first_run = 0;
us.xsize = sizeof(us);
us.f.buf = us.f.real_buf;
us.f.gbe_fd = -1;
us.f.tmp_fd = -1;
us.f.tname = NULL;
us.f.fname = NULL;
return &us;
}
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 (x_i_close(f->gbe_fd) == -1)
close_err = 1;
f->gbe_fd = -1;
}
if (f->tmp_fd > -1) {
if (x_i_close(f->tmp_fd) == -1)
close_err = 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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