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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).
*/
#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"
int
main(int argc, char *argv[])
{
struct xstate *x;
struct commands *cmd;
struct xfile *f;
unsigned long i;
char *tmp_path;
struct stat st;
int fd;
tmp_path = NULL;
#ifndef S_ISREG
err(ECANCELED, "Can't determine file types (S_ISREG undefined)");
#endif
#ifndef CHAR_BIT
err(ECANCELED, "Unknown char size");
#else
if (CHAR_BIT != 8)
err(EINVAL, "Unsupported char size");
#endif
if (argc < 3)
usage();
#ifdef NVMUTIL_UNVEIL
/*
* if global tmp is a different filesystem,
* unveil would trap on final file rename
* and we can't know the path in advance
*/
tmp_path = new_tmpfile(&fd, 1, NULL);
#else
tmp_path = new_tmpfile(&fd, 0, NULL);
#endif
if (tmp_path == NULL)
err(errno, "Can't create tmpfile");
#ifdef NVMUTIL_PLEDGE
#ifdef NVMUTIL_UNVEIL
if (pledge("stdio flock rpath wpath cpath unveil", NULL) == -1)
err(errno, "pledge, unveil");
if (unveil("/dev/null", "r") == -1)
err(errno, "unveil: /dev/null");
#else
if (pledge("stdio flock rpath wpath cpath", NULL) == -1)
err(errno, "pledge");
#endif
#endif
x = xstatus();
if (x == NULL)
err(errno, NULL);
if (x->f.buf == NULL)
err(EINVAL, "Work buffer not initialised");
x->argv0 = argv[0];
f = &x->f;
f->fname = argv[1];
f->tname = tmp_path;
f->tmp_fd = fd;
if(fstat(fd, &st) < 0)
err(errno, "can't stat tmpfile");
f->tmp_dev = st.st_dev;
f->tmp_ino = st.st_ino;
sanitize_command_list();
set_cmd(argc, argv);
set_cmd_args(argc, argv);
i = x->i;
cmd = &x->cmd[i];
#ifdef NVMUTIL_UNVEIL
if ((cmd->flags & O_ACCMODE) == O_RDONLY) {
if (unveil(f->fname, "r") == -1)
err(errno, "%s: unveil r", f->fname);
} else {
if (unveil(f->tname, "rwc") == -1)
err(errno, "%s: unveil rw", f->tname);
}
if (unveil(f->tname, "rwc") == -1)
err(errno, "%s: unveil rwc", f->tname);
if (unveil(NULL, NULL) == -1)
err(errno, "unveil block (rw)");
if (pledge("stdio flock rpath wpath cpath", NULL) == -1)
err(errno, "pledge (kill unveil)");
#endif
open_gbe_file();
memset(f->buf, 0, GBE_BUF_SIZE);
memset(f->bufcmp, 0, GBE_BUF_SIZE);
copy_gbe();
read_checksums();
run_cmd();
if ((cmd->flags & O_ACCMODE) == O_RDWR)
write_to_gbe_bin();
if (exit_cleanup() == -1)
err(EIO, "%s: close", f->fname);
if (f->io_err_gbe_bin)
err(EIO, "%s: error writing final file");
if (f->tname != NULL)
free(f->tname);
return EXIT_SUCCESS;
}
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