1 files changed, 116 insertions, 0 deletions
diff --git a/util/libreboot-utils/nvmutil.c b/util/libreboot-utils/nvmutil.c
new file mode 100644
index 00000000..ec41371f
--- /dev/null
+++ b/util/libreboot-utils/nvmutil.c
@@ -0,0 +1,116 @@
+/* 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.
+ */
+
+#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"
+
+static void
+exit_cleanup(void);
+
+int
+main(int argc, char *argv[])
+{
+	struct xstate *x;
+	struct commands *cmd;
+	struct xfile *f;
+	size_t c;
+
+	(void) errhook(exit_cleanup);
+	(void) lbsetprogname(argv[0]);
+
+	/* https://man.openbsd.org/pledge.2 */
+	/* https://man.openbsd.org/unveil.2 */
+	xpledgex("stdio flock rpath wpath cpath unveil", NULL);
+	xunveilx("/dev/urandom", "r");
+
+#ifndef S_ISREG
+	err_exit(ECANCELED,
+	    "Can't determine file types (S_ISREG undefined)");
+#endif
+#if ((CHAR_BIT) != 8)
+	err_exit(ECANCELED, "Unsupported char size");
+#endif
+
+	if ((x = xstart(argc, argv)) == NULL)
+		err_exit(ECANCELED, "NULL state on init");
+
+	/* parse user command */
+/* TODO: CHECK ACCESSES VIA xstatus() */
+	set_cmd(argc, argv);
+	set_cmd_args(argc, argv);
+
+	cmd = &x->cmd[x->i];
+	f = &x->f;
+
+	if ((cmd->flags & O_ACCMODE) == O_RDONLY)
+		xunveilx(f->fname, "r");
+	else
+		xunveilx(f->fname, "rwc");
+
+	xunveilx(f->tname, "rwc");
+	xunveilx(NULL, NULL);
+	xpledgex("stdio flock rpath wpath cpath", NULL);
+
+	if (cmd->run == NULL)
+		err_exit(errno, "Command not set");
+
+	sanitize_command_list();
+	open_gbe_file();
+	copy_gbe();
+	read_checksums();
+	cmd->run();
+
+	for (c = 0; c < items(x->cmd); c++)
+		x->cmd[c].run = cmd_helper_err;
+
+	if ((cmd->flags & O_ACCMODE) == O_RDWR)
+		write_to_gbe_bin();
+
+	exit_cleanup();
+	if (f->io_err_gbe_bin)
+		err_exit(EIO, "%s: error writing final file");
+
+	free_and_set_null(&f->tname);
+
+	return EXIT_SUCCESS;
+}
+
+static void
+exit_cleanup(void)
+{
+	struct xstate *x;
+	struct xfile *f;
+
+	x = xstatus();
+	if (x == NULL)
+		return;
+
+	f = &x->f;
+
+	/* close fds if still open */
+	close_on_eintr(&f->tmp_fd);
+	close_on_eintr(&f->gbe_fd);
+
+	/* unlink tmpfile if it exists */
+	if (f->tname != NULL) {
+		(void) unlink(f->tname);
+		free_and_set_null(&f->tname);
+	}
+}