/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include <getopt.h> #include <limits.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "alloc-util.h" #include "conf-files.h" #include "def.h" #include "fd-util.h" #include "fileio.h" #include "log.h" #include "string-util.h" #include "strv.h" #include "util.h" static const char conf_file_dirs[] = CONF_PATHS_NULSTR("binfmt.d"); 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_nulstr(path, "re", NULL, conf_file_dirs, &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 void help(void) { printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" "Registers binary formats.\n\n" " -h --help Show this help\n" " --version Show package version\n" , program_invocation_short_name); } static int parse_argv(int argc, char *argv[]) { enum { ARG_VERSION = 0x100, }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, ARG_VERSION }, {} }; int c; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) switch (c) { case 'h': help(); return 0; case ARG_VERSION: return version(); case '?': return -EINVAL; default: assert_not_reached("Unhandled option"); } 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_nulstr(&files, ".conf", NULL, conf_file_dirs); if (r < 0) { log_error_errno(r, "Failed to enumerate binfmt.d files: %m"); 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: return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }