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#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libkmod.h>
#include <dirent.h>
#include "common.h"
static char *aliasdefault = NULL;
static char * version = NULL;
static void get_version(void) {
if (version != NULL)
return;
struct utsname buf;
uname(&buf);
version = strdup(buf.release);
}
char*dirname;
static void set_default_alias_file(void) {
struct utsname rel_buf;
if (!aliasdefault) {
char *dirname;
char *fallback_aliases = table_name_to_file("fallback-modules.alias");
char *aliasfilename;
struct stat st_alias, st_fallback;
uname(&rel_buf);
asprintf(&dirname, "%s/%s", "/lib/modules", rel_buf.release);
asprintf(&aliasfilename, "%s/modules.alias", dirname);
free(dirname);
/* fallback on ldetect-lst's modules.alias and prefer it if more recent */
if (stat(aliasfilename, &st_alias) ||
(!stat(fallback_aliases, &st_fallback) && st_fallback.st_mtime > st_alias.st_mtime)) {
free(aliasfilename);
aliasdefault = fallback_aliases;
} else {
aliasdefault = aliasfilename;
free(fallback_aliases);
}
}
}
char *modalias_resolve_module(const char *modalias) {
struct kmod_ctx *ctx;
struct kmod_list *l, *list = NULL;
int err;
char* dkms_file, *str = NULL;
if (!aliasdefault)
set_default_alias_file();
get_version();
/* We only use canned aliases as last resort. */
dkms_file = table_name_to_file("dkms-modules.alias");
const char *alias_filelist[] = {
"/run/modprobe.d",
"/etc/modprobe.d",
"/lib/modprobe.d",
"/lib/module-init-tools/ldetect-lst-modules.alias",
aliasdefault,
dkms_file,
NULL,
};
/* Init libkmod */
ctx = kmod_new(dirname, alias_filelist);
if (!ctx) {
fputs("Error: kmod_new() failed!\n", stderr);
goto exit;
}
kmod_load_resources(ctx);
err = kmod_module_new_from_lookup(ctx, modalias, &list);
if (err < 0)
goto exit;
// No module found...
if (list == NULL)
goto exit;
// filter through blacklist
struct kmod_list *filtered = NULL;
err = kmod_module_get_filtered_blacklist(ctx, list, &filtered);
kmod_module_unref_list(list);
if (err <0)
goto exit;
list = filtered;
kmod_list_foreach(l, list) {
struct kmod_module *mod = kmod_module_get_module(l);
//if (str) // keep last one
// free(str);
if (!str) // keep first one
str = strdup(kmod_module_get_name(mod));
kmod_module_unref(mod);
if (err < 0)
break;
}
kmod_module_unref_list(list);
exit:
free(dkms_file);
kmod_unref(ctx);
return str;
}
void modalias_cleanup(void) {
ifree(aliasdefault);
ifree(version);
}
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