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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "alloc-util.h"
#include "binfmt-util.h"
#include "build.h"
#include "conf-files.h"
#include "constants.h"
#include "fd-util.h"
#include "fileio.h"
#include "log.h"
#include "main-func.h"
#include "pager.h"
#include "path-util.h"
#include "pretty-print.h"
#include "string-util.h"
#include "strv.h"
static bool arg_cat_config = false;
static PagerFlags arg_pager_flags = 0;
static bool arg_unregister = false;
static int delete_rule(const char *rulename) {
const char *fn = strjoina("/proc/sys/fs/binfmt_misc/", rulename);
return write_string_file(fn, "-1", WRITE_STRING_FILE_DISABLE_BUFFER);
}
static int apply_rule(const char *filename, unsigned line, const char *rule) {
assert(filename);
assert(line > 0);
assert(rule);
assert(rule[0]);
_cleanup_free_ char *rulename = NULL;
int r;
rulename = strdupcspn(rule + 1, CHAR_TO_STR(rule[0]));
if (!rulename)
return log_oom();
if (!filename_is_valid(rulename) ||
STR_IN_SET(rulename, "register", "status"))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"%s:%u: Rule name '%s' is not valid, refusing.",
filename, line, rulename);
r = delete_rule(rulename);
if (r < 0 && r != -ENOENT)
log_warning_errno(r, "%s:%u: Failed to delete rule '%s', ignoring: %m",
filename, line, rulename);
if (r >= 0)
log_debug("%s:%u: Rule '%s' deleted.", filename, line, rulename);
r = write_string_file("/proc/sys/fs/binfmt_misc/register", rule, WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
return log_error_errno(r, "%s:%u: Failed to add binary format '%s': %m",
filename, line, rulename);
log_debug("%s:%u: Binary format '%s' registered.", filename, line, rulename);
return 0;
}
static int apply_file(const char *filename, bool ignore_enoent) {
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *pp = NULL;
int r;
assert(filename);
r = search_and_fopen(filename, "re", NULL, (const char**) CONF_PATHS_STRV("binfmt.d"), &f, &pp);
if (r < 0) {
if (ignore_enoent && r == -ENOENT)
return 0;
return log_error_errno(r, "Failed to open file '%s': %m", filename);
}
log_debug("Applying %s%s", pp, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
for (unsigned line = 1;; line++) {
_cleanup_free_ char *text = NULL;
char *p;
int k;
k = read_line(f, LONG_LINE_MAX, &text);
if (k < 0)
return log_error_errno(k, "Failed to read file '%s': %m", pp);
if (k == 0)
break;
p = strstrip(text);
if (isempty(p))
continue;
if (strchr(COMMENTS, p[0]))
continue;
RET_GATHER(r, apply_rule(filename, line, p));
}
return r;
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-binfmt.service", "8", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
"Registers binary formats with the kernel.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --cat-config Show configuration files\n"
" --no-pager Do not pipe output into a pager\n"
" --unregister Unregister all existing entries\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_CAT_CONFIG,
ARG_NO_PAGER,
ARG_UNREGISTER,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
{ "unregister", no_argument, NULL, ARG_UNREGISTER },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_CAT_CONFIG:
arg_cat_config = true;
break;
case ARG_NO_PAGER:
arg_pager_flags |= PAGER_DISABLE;
break;
case ARG_UNREGISTER:
arg_unregister = true;
break;
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if ((arg_unregister || arg_cat_config) && argc > optind)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Positional arguments are not allowed with --cat-config or --unregister");
return 1;
}
static int binfmt_mounted_warn(void) {
int r;
r = binfmt_mounted();
if (r < 0)
return log_error_errno(r, "Failed to check if /proc/sys/fs/binfmt_misc is mounted: %m");
if (r == 0)
log_debug("/proc/sys/fs/binfmt_misc is not mounted in read-write mode, skipping.");
return r;
}
static int run(int argc, char *argv[]) {
int r;
r = parse_argv(argc, argv);
if (r <= 0)
return r;
log_setup();
umask(0022);
r = 0;
if (arg_unregister)
return disable_binfmt();
if (argc > optind) {
r = binfmt_mounted_warn();
if (r <= 0)
return r;
for (int i = optind; i < argc; i++)
RET_GATHER(r, apply_file(argv[i], false));
} else {
_cleanup_strv_free_ char **files = NULL;
r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char**) CONF_PATHS_STRV("binfmt.d"));
if (r < 0)
return log_error_errno(r, "Failed to enumerate binfmt.d files: %m");
if (arg_cat_config) {
pager_open(arg_pager_flags);
return cat_files(NULL, files, 0);
}
r = binfmt_mounted_warn();
if (r <= 0)
return r;
/* Flush out all rules */
r = write_string_file("/proc/sys/fs/binfmt_misc/status", "-1", WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
log_warning_errno(r, "Failed to flush binfmt_misc rules, ignoring: %m");
else
log_debug("Flushed all binfmt_misc rules.");
STRV_FOREACH(f, files)
RET_GATHER(r, apply_file(*f, true));
}
return r;
}
DEFINE_MAIN_FUNCTION(run);
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