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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 <modprobe.h>
#include <dirent.h>
#include "common.h"
static char *aliasdefault = NULL;
static void free_aliases(struct module_alias *aliases) {
if (aliases == NULL)
return;
while (aliases->next) {
struct module_alias *next;
next = aliases->next;
free(aliases->module);
free(aliases);
aliases = next;
}
free(aliases);
}
static void free_options(struct module_options *modoptions) {
if (modoptions == NULL)
return;
while (modoptions->next) {
struct module_options *next;
next = modoptions->next;
free(modoptions->modulename);
free(modoptions->options);
free(modoptions);
modoptions = next;
}
free(modoptions);
}
static void free_commands(struct module_command *commands) {
if (commands == NULL)
return;
while (commands->next) {
struct module_command *next;
next = commands->next;
free(commands->modulename);
free(commands->command);
free(commands);
commands = next;
}
free(commands);
}
static void free_blacklist(struct module_blacklist *blacklist) {
if (blacklist == NULL)
return;
while (blacklist->next) {
struct module_blacklist *next;
next = blacklist->next;
free(blacklist->modulename);
free(blacklist);
blacklist = next;
}
free(blacklist);
}
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", MODULE_DIR, 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;
}
}
}
char *modalias_resolve_module(const char *modalias) {
struct module_command *commands = NULL;
struct module_options *modoptions = NULL;
struct module_alias *aliases = NULL;
struct module_blacklist *blacklist = NULL;
const char *config = NULL;
if (!aliasdefault)
set_default_alias_file();
/* Returns the resolved alias, options */
read_toplevel_config(config, modalias, 0,
0, &modoptions, &commands, &aliases, &blacklist);
if (!aliases) {
/* We only use canned aliases as last resort. */
char *dkms_file = table_name_to_file("dkms-modules.alias");
char *alias_filelist[] = {
"/lib/module-init-tools/ldetect-lst-modules.alias",
aliasdefault,
dkms_file,
NULL,
};
char **alias_file = alias_filelist;
while (!aliases && *alias_file) {
read_config(*alias_file, modalias, 0,
0, &modoptions, &commands,
&aliases, &blacklist);
aliases = apply_blacklist(aliases, blacklist);
alias_file++;
}
free(dkms_file);
}
free_blacklist(blacklist);
free_commands(commands);
free_options(modoptions);
if (aliases) {
char *result;
// take the last one because we find eg: generic/ata_generic/sata_sil
struct module_alias *it = aliases;
while (it->next)
it = it->next;
result = strdup(it->module);
free_aliases(aliases);
return result;
}
return NULL;
}
void modalias_cleanup(void) {
ifree(aliasdefault);
}
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