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/*-*- 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 <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_KMOD
#include <libkmod.h>
#endif
#include "macro.h"
#include "execute.h"
#include "capability.h"
#include "kmod-setup.h"
#ifdef HAVE_KMOD
static void systemd_kmod_log(
void *data,
int priority,
const char *file, int line,
const char *fn,
const char *format,
va_list args) {
/* library logging is enabled at debug only */
DISABLE_WARNING_FORMAT_NONLITERAL;
log_metav(LOG_DEBUG, file, line, fn, format, args);
REENABLE_WARNING;
}
static bool cmdline_check_kdbus(void) {
_cleanup_free_ char *line = NULL;
const char *p;
int r;
r = proc_cmdline(&line);
if (r < 0)
return false;
p = line;
for (;;) {
_cleanup_free_ char *word = NULL;
r = unquote_first_word(&p, &word, true);
if (r <= 0)
return false;
if (streq(word, "kdbus"))
return true;
}
}
#endif
int kmod_setup(void) {
#ifdef HAVE_KMOD
static const struct {
const char *module;
const char *path;
bool warn;
bool (*condition_fn)(void);
} kmod_table[] = {
/* auto-loading on use doesn't work before udev is up */
{ "autofs4", "/sys/class/misc/autofs", true, NULL },
/* early configure of ::1 on the loopback device */
{ "ipv6", "/sys/module/ipv6", true, NULL },
/* this should never be a module */
{ "unix", "/proc/net/unix", true, NULL },
/* IPC is needed before we bring up any other services */
{ "kdbus", "/sys/fs/kdbus", false, cmdline_check_kdbus },
};
struct kmod_ctx *ctx = NULL;
unsigned int i;
int r;
if (have_effective_cap(CAP_SYS_MODULE) == 0)
return 0;
for (i = 0; i < ELEMENTSOF(kmod_table); i++) {
struct kmod_module *mod;
if (kmod_table[i].path && access(kmod_table[i].path, F_OK) >= 0)
continue;
if (kmod_table[i].condition_fn && !kmod_table[i].condition_fn())
continue;
if (kmod_table[i].warn)
log_debug("Your kernel apparently lacks built-in %s support. Might be "
"a good idea to compile it in. We'll now try to work around "
"this by loading the module...", kmod_table[i].module);
if (!ctx) {
ctx = kmod_new(NULL, NULL);
if (!ctx)
return log_oom();
kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
kmod_load_resources(ctx);
}
r = kmod_module_new_from_name(ctx, kmod_table[i].module, &mod);
if (r < 0) {
log_error("Failed to lookup module '%s'", kmod_table[i].module);
continue;
}
r = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL);
if (r == 0)
log_info("Inserted module '%s'", kmod_module_get_name(mod));
else if (r == KMOD_PROBE_APPLY_BLACKLIST)
log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
else if (kmod_table[i].warn)
log_error("Failed to insert module '%s'", kmod_module_get_name(mod));
kmod_module_unref(mod);
}
if (ctx)
kmod_unref(ctx);
#endif
return 0;
}
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