229 lines
5.9 KiB
C
229 lines
5.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <getopt.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "alloc-util.h"
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#include "conf-files.h"
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#include "def.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "pager.h"
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#include "string-util.h"
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#include "strv.h"
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#include "terminal-util.h"
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#include "util.h"
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static bool arg_cat_config = false;
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static bool arg_no_pager = false;
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static int delete_rule(const char *rule) {
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_cleanup_free_ char *x = NULL, *fn = NULL;
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char *e;
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assert(rule[0]);
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x = strdup(rule);
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if (!x)
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return log_oom();
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e = strchrnul(x+1, x[0]);
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*e = 0;
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fn = strappend("/proc/sys/fs/binfmt_misc/", x+1);
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if (!fn)
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return log_oom();
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return write_string_file(fn, "-1", 0);
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}
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static int apply_rule(const char *rule) {
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int r;
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delete_rule(rule);
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r = write_string_file("/proc/sys/fs/binfmt_misc/register", rule, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to add binary format: %m");
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return 0;
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}
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static int apply_file(const char *path, bool ignore_enoent) {
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(path);
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r = search_and_fopen(path, "re", NULL, (const char**) CONF_PATHS_STRV("binfmt.d"), &f);
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if (r < 0) {
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if (ignore_enoent && r == -ENOENT)
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return 0;
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return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
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}
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log_debug("apply: %s", path);
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for (;;) {
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char l[LINE_MAX], *p;
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int k;
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if (!fgets(l, sizeof(l), f)) {
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if (feof(f))
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break;
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return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path);
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}
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p = strstrip(l);
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if (!*p)
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continue;
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if (strchr(COMMENTS "\n", *p))
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continue;
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k = apply_rule(p);
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if (k < 0 && r == 0)
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r = k;
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}
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return r;
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}
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static int help(void) {
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_cleanup_free_ char *link = NULL;
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int r;
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r = terminal_urlify_man("systemd-binfmt.service", "8", &link);
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if (r < 0)
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return log_oom();
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printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
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"Registers binary formats with the kernel.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --cat-config Show configuration files\n"
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" --no-pager Do not pipe output into a pager\n"
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"\nSee the %s for details.\n"
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, program_invocation_short_name
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, link
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);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_CAT_CONFIG,
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ARG_NO_PAGER,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
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{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
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{}
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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return help();
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case ARG_VERSION:
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return version();
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case ARG_CAT_CONFIG:
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arg_cat_config = true;
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break;
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case ARG_NO_PAGER:
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arg_no_pager = true;
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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if (arg_cat_config && argc > optind) {
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log_error("Positional arguments are not allowed with --cat-config");
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return -EINVAL;
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}
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return 1;
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}
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int main(int argc, char *argv[]) {
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int r, k;
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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r = 0;
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if (argc > optind) {
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int i;
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for (i = optind; i < argc; i++) {
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k = apply_file(argv[i], false);
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if (k < 0 && r == 0)
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r = k;
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}
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} else {
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_cleanup_strv_free_ char **files = NULL;
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char **f;
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r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char**) CONF_PATHS_STRV("binfmt.d"));
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if (r < 0) {
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log_error_errno(r, "Failed to enumerate binfmt.d files: %m");
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goto finish;
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}
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if (arg_cat_config) {
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(void) pager_open(arg_no_pager, false);
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r = cat_files(NULL, files, 0);
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goto finish;
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}
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/* Flush out all rules */
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write_string_file("/proc/sys/fs/binfmt_misc/status", "-1", 0);
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STRV_FOREACH(f, files) {
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k = apply_file(*f, true);
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if (k < 0 && r == 0)
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r = k;
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}
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}
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finish:
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pager_close();
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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