diff options
Diffstat (limited to 'src/binfmt.c')
| -rw-r--r-- | src/binfmt.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/binfmt.c b/src/binfmt.c new file mode 100644 index 0000000000..6ebd212ee1 --- /dev/null +++ b/src/binfmt.c @@ -0,0 +1,187 @@ +/*-*- 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 General Public License as published by + the Free Software Foundation; either version 2 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <stdlib.h> +#include <stdbool.h> +#include <errno.h> +#include <string.h> +#include <stdio.h> +#include <limits.h> + +#include "log.h" +#include "util.h" + +static int delete_rule(const char *rule) { + char *x, *fn, *e; + int r; + + assert(rule[0]); + + if (!(x = strdup(rule))) + return -ENOMEM; + + e = strchrnul(x+1, x[0]); + *e = 0; + + asprintf(&fn, "/proc/sys/fs/binfmt_misc/%s", x+1); + free(x); + + if (!fn) + return -ENOMEM; + + r = write_one_line_file(fn, "-1"); + free(fn); + + return r; +} + +static int apply_rule(const char *rule) { + int r; + + delete_rule(rule); + + if ((r = write_one_line_file("/proc/sys/fs/binfmt_misc/register", rule)) < 0) { + log_error("Failed to add binary format: %s", strerror(-r)); + return r; + } + + return 0; +} + +static int apply_file(const char *path, bool ignore_enoent) { + FILE *f; + int r = 0; + + assert(path); + + if (!(f = fopen(path, "re"))) { + if (ignore_enoent && errno == ENOENT) + return 0; + + log_error("Failed to open file '%s', ignoring: %m", path); + return -errno; + } + + while (!feof(f)) { + char l[LINE_MAX], *p; + int k; + + if (!fgets(l, sizeof(l), f)) { + if (feof(f)) + break; + + log_error("Failed to read file '%s', ignoring: %m", path); + r = -errno; + goto finish; + } + + p = strstrip(l); + + if (!*p) + continue; + + if (strchr(COMMENTS, *p)) + continue; + + if ((k = apply_rule(p)) < 0 && r == 0) + r = k; + } + +finish: + fclose(f); + + return r; +} + +static int scandir_filter(const struct dirent *d) { + assert(d); + + if (ignore_file(d->d_name)) + return 0; + + if (d->d_type != DT_REG && + d->d_type != DT_LNK && + d->d_type != DT_UNKNOWN) + return 0; + + return endswith(d->d_name, ".conf"); +} + +static int apply_tree(const char *path) { + struct dirent **de = NULL; + int n, i, r = 0; + + if ((n = scandir(path, &de, scandir_filter, alphasort)) < 0) { + + if (errno == ENOENT) + return 0; + + log_error("Failed to enumerate %s files: %m", path); + return -errno; + } + + for (i = 0; i < n; i++) { + char *fn; + int k; + + k = asprintf(&fn, "%s/%s", path, de[i]->d_name); + free(de[i]); + + if (k < 0) { + log_error("Failed to allocate file name."); + + if (r == 0) + r = -ENOMEM; + continue; + } + + if ((k = apply_file(fn, true)) < 0 && r == 0) + r = k; + } + + free(de); + + return r; +} + +int main(int argc, char *argv[]) { + int r = 0; + + if (argc > 2) { + log_error("This program expects one or no arguments."); + return EXIT_FAILURE; + } + + log_set_target(LOG_TARGET_AUTO); + log_parse_environment(); + log_open(); + + if (argc > 1) + r = apply_file(argv[1], false); + else { + /* Flush out all rules */ + write_one_line_file("/proc/sys/fs/binfmt_misc/status", "-1"); + + r = apply_tree("/etc/binfmt.d"); + } + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} |