/* SPDX-License-Identifier: LGPL-2.1+ */ #include #include #include #include #include #include #include #include "alloc-util.h" #include "conf-files.h" #include "def.h" #include "fd-util.h" #include "fileio.h" #include "log.h" #include "pager.h" #include "string-util.h" #include "strv.h" #include "terminal-util.h" #include "util.h" static bool arg_cat_config = false; static bool arg_no_pager = false; static int delete_rule(const char *rule) { _cleanup_free_ char *x = NULL, *fn = NULL; char *e; assert(rule[0]); x = strdup(rule); if (!x) return log_oom(); e = strchrnul(x+1, x[0]); *e = 0; fn = strappend("/proc/sys/fs/binfmt_misc/", x+1); if (!fn) return log_oom(); return write_string_file(fn, "-1", 0); } static int apply_rule(const char *rule) { int r; delete_rule(rule); r = write_string_file("/proc/sys/fs/binfmt_misc/register", rule, 0); if (r < 0) return log_error_errno(r, "Failed to add binary format: %m"); return 0; } static int apply_file(const char *path, bool ignore_enoent) { _cleanup_fclose_ FILE *f = NULL; int r; assert(path); r = search_and_fopen(path, "re", NULL, (const char**) CONF_PATHS_STRV("binfmt.d"), &f); if (r < 0) { if (ignore_enoent && r == -ENOENT) return 0; return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path); } log_debug("apply: %s", path); for (;;) { char l[LINE_MAX], *p; int k; if (!fgets(l, sizeof(l), f)) { if (feof(f)) break; return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path); } p = strstrip(l); if (!*p) continue; if (strchr(COMMENTS "\n", *p)) continue; k = apply_rule(p); if (k < 0 && r == 0) r = k; } 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" "\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, }; 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 }, {} }; 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_no_pager = true; break; case '?': return -EINVAL; default: assert_not_reached("Unhandled option"); } if (arg_cat_config && argc > optind) { log_error("Positional arguments are not allowed with --cat-config"); return -EINVAL; } return 1; } int main(int argc, char *argv[]) { int r, k; r = parse_argv(argc, argv); if (r <= 0) return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; log_set_target(LOG_TARGET_AUTO); log_parse_environment(); log_open(); umask(0022); r = 0; if (argc > optind) { int i; for (i = optind; i < argc; i++) { k = apply_file(argv[i], false); if (k < 0 && r == 0) r = k; } } else { _cleanup_strv_free_ char **files = NULL; char **f; r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char**) CONF_PATHS_STRV("binfmt.d")); if (r < 0) { log_error_errno(r, "Failed to enumerate binfmt.d files: %m"); goto finish; } if (arg_cat_config) { (void) pager_open(arg_no_pager, false); r = cat_files(NULL, files, 0); goto finish; } /* Flush out all rules */ write_string_file("/proc/sys/fs/binfmt_misc/status", "-1", 0); STRV_FOREACH(f, files) { k = apply_file(*f, true); if (k < 0 && r == 0) r = k; } } finish: pager_close(); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }