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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2024 Microsoft Corporation. All rights reserved.
*/
#include <stdlib.h>
#include <stddef.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
static void usage(const char *const name)
{
printf("Usage: %s OutputFile (PolicyFile)\n", name);
exit(EINVAL);
}
static int policy_to_buffer(const char *pathname, char **buffer, size_t *size)
{
size_t fsize;
size_t read;
char *lbuf;
int rc = 0;
FILE *fd;
fd = fopen(pathname, "r");
if (!fd) {
rc = errno;
goto out;
}
fseek(fd, 0, SEEK_END);
fsize = ftell(fd);
rewind(fd);
lbuf = malloc(fsize);
if (!lbuf) {
rc = ENOMEM;
goto out_close;
}
read = fread((void *)lbuf, sizeof(*lbuf), fsize, fd);
if (read != fsize) {
rc = -1;
goto out_free;
}
*buffer = lbuf;
*size = fsize;
fclose(fd);
return rc;
out_free:
free(lbuf);
out_close:
fclose(fd);
out:
return rc;
}
static int write_boot_policy(const char *pathname, const char *buf, size_t size)
{
FILE *fd;
size_t i;
fd = fopen(pathname, "w");
if (!fd)
return errno;
fprintf(fd, "/* This file is automatically generated.");
fprintf(fd, " Do not edit. */\n");
fprintf(fd, "#include <linux/stddef.h>\n");
fprintf(fd, "\nextern const char *const ipe_boot_policy;\n\n");
fprintf(fd, "const char *const ipe_boot_policy =\n");
if (!buf || size == 0) {
fprintf(fd, "\tNULL;\n");
fclose(fd);
return 0;
}
fprintf(fd, "\t\"");
for (i = 0; i < size; ++i) {
switch (buf[i]) {
case '"':
fprintf(fd, "\\\"");
break;
case '\'':
fprintf(fd, "'");
break;
case '\n':
fprintf(fd, "\\n\"\n\t\"");
break;
case '\\':
fprintf(fd, "\\\\");
break;
case '\t':
fprintf(fd, "\\t");
break;
case '\?':
fprintf(fd, "\\?");
break;
default:
fprintf(fd, "%c", buf[i]);
}
}
fprintf(fd, "\";\n");
fclose(fd);
return 0;
}
int main(int argc, const char *const argv[])
{
char *policy = NULL;
size_t len = 0;
int rc = 0;
if (argc < 2)
usage(argv[0]);
if (argc > 2) {
rc = policy_to_buffer(argv[2], &policy, &len);
if (rc != 0)
goto cleanup;
}
rc = write_boot_policy(argv[1], policy, len);
cleanup:
if (policy)
free(policy);
if (rc != 0)
perror("An error occurred during policy conversion: ");
return rc;
}
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