blob: 7424e7c02f58977b4eb6c64cff159f08bbc35aef [file] [log] [blame]
/* modprobe.c - modprobe utility.
*
* Copyright 2012 Madhur Verma <mad.flexi@gmail.com>
* Copyright 2013 Kyungwan Han <asura321@gmail.com>
*
* No Standard.
USE_MODPROBE(NEWTOY(modprobe, "alrqvsDbd*", TOYFLAG_SBIN))
config MODPROBE
bool "modprobe"
default n
help
usage: modprobe [-alrqvsDb] [-d DIR] MODULE [symbol=value][...]
modprobe utility - inserts modules and dependencies.
-a Load multiple MODULEs
-d Load modules from DIR, option may be used multiple times
-l List (MODULE is a pattern)
-r Remove MODULE (stacks) or do autoclean
-q Quiet
-v Verbose
-s Log to syslog
-D Show dependencies
-b Apply blacklist to module names too
*/
#define FOR_modprobe
#include "toys.h"
#include <sys/syscall.h>
GLOBALS(
struct arg_list *dirs;
struct arg_list *probes, *dbase[256];
char *cmdopts;
int nudeps, symreq;
)
/* Note: if "#define DBASE_SIZE" modified,
* Please update GLOBALS dbase[256] accordingly.
*/
#define DBASE_SIZE 256
#define MODNAME_LEN 256
// Modules flag definations
#define MOD_ALOADED 0x0001
#define MOD_BLACKLIST 0x0002
#define MOD_FNDDEPMOD 0x0004
#define MOD_NDDEPS 0x0008
// Current probing modules info
struct module_s {
uint32_t flags;
char *cmdname, *name, *depent, *opts;
struct arg_list *rnames, *dep;
};
// Converts path name FILE to module name.
static char *path2mod(char *file, char *mod)
{
int i;
char *from;
if (!file) return NULL;
if (!mod) mod = xmalloc(MODNAME_LEN);
from = getbasename(file);
for (i = 0; i < (MODNAME_LEN-1) && from[i] && from[i] != '.'; i++)
mod[i] = (from[i] == '-') ? '_' : from[i];
mod[i] = '\0';
return mod;
}
// Add options in opts from toadd.
static char *add_opts(char *opts, char *toadd)
{
if (toadd) {
int optlen = 0;
if (opts) optlen = strlen(opts);
opts = xrealloc(opts, optlen + strlen(toadd) + 2);
sprintf(opts + optlen, " %s", toadd);
}
return opts;
}
// Remove first element from the list and return it.
static void *llist_popme(struct arg_list **head)
{
char *data = NULL;
struct arg_list *temp = *head;
if (temp) {
data = temp->arg;
*head = temp->next;
free(temp);
}
return data;
}
// Add new node at the beginning of the list.
static void llist_add(struct arg_list **old, void *data)
{
struct arg_list *new = xmalloc(sizeof(struct arg_list));
new->arg = (char*)data;
new->next = *old;
*old = new;
}
// Add new node at tail of list.
static void llist_add_tail(struct arg_list **head, void *data)
{
while (*head) head = &(*head)->next;
*head = xzalloc(sizeof(struct arg_list));
(*head)->arg = (char*)data;
}
// Reverse list order.
static struct arg_list *llist_rev(struct arg_list *list)
{
struct arg_list *rev = NULL;
while (list) {
struct arg_list *next = list->next;
list->next = rev;
rev = list;
list = next;
}
return rev;
}
/*
* Returns struct module_s from the data base if found, NULL otherwise.
* if add - create module entry, add it to data base and return the same mod.
*/
static struct module_s *get_mod(char *mod, uint8_t add)
{
char name[MODNAME_LEN];
struct module_s *modentry;
struct arg_list *temp;
unsigned i, hash = 0;
path2mod(mod, name);
for (i = 0; name[i]; i++) hash = ((hash*31) + hash) + name[i];
hash %= DBASE_SIZE;
for (temp = TT.dbase[hash]; temp; temp = temp->next) {
modentry = (struct module_s *) temp->arg;
if (!strcmp(modentry->name, name)) return modentry;
}
if (!add) return NULL;
modentry = xzalloc(sizeof(*modentry));
modentry->name = xstrdup(name);
llist_add(&TT.dbase[hash], modentry);
return modentry;
}
/*
* Read a line from file with \ continuation and escape commented line.
* Return the line in allocated string (*li)
*/
static int read_line(FILE *fl, char **li)
{
char *nxtline = NULL, *line;
ssize_t len, nxtlen;
size_t linelen, nxtlinelen;
for (;;) {
line = NULL;
linelen = nxtlinelen = 0;
len = getline(&line, &linelen, fl);
if (len <= 0) {
free(line);
return len;
}
// checking for commented lines.
if (line[0] != '#') break;
free(line);
}
for (;;) {
if (line[len - 1] == '\n') len--;
if (!len) {
free(line);
return len;
} else if (line[len - 1] != '\\') break;
len--;
nxtlen = getline(&nxtline, &nxtlinelen, fl);
if (nxtlen <= 0) break;
if (linelen < len + nxtlen + 1) {
linelen = len + nxtlen + 1;
line = xrealloc(line, linelen);
}
memcpy(&line[len], nxtline, nxtlen);
len += nxtlen;
}
line[len] = '\0';
*li = xstrdup(line);
free(line);
if (nxtline) free(nxtline);
return len;
}
/*
* Action to be taken on all config files in default directories
* checks for aliases, options, install, remove and blacklist
*/
static int config_action(struct dirtree *node)
{
FILE *fc;
char *filename, *tokens[3], *line, *linecp;
struct module_s *modent;
int tcount = 0;
if (!dirtree_notdotdot(node)) return 0;
if (S_ISDIR(node->st.st_mode)) return DIRTREE_RECURSE;
if (!S_ISREG(node->st.st_mode)) return 0; // process only regular file
filename = dirtree_path(node, NULL);
if (!(fc = fopen(filename, "r"))) {
free(filename);
return 0;
}
for (line = linecp = NULL; read_line(fc, &line) > 0;
free(line), free(linecp), line = linecp = NULL) {
char *tk = NULL;
if (!strlen(line)) continue;
linecp = xstrdup(line);
for (tk = strtok(linecp, "# \t"), tcount = 0; tk;
tk = strtok(NULL, "# \t"), tcount++) {
tokens[tcount] = tk;
if (tcount == 2) {
tokens[2] = line + strlen(tokens[0]) + strlen(tokens[1]) + 2;
break;
}
}
if (!tk) continue;
// process the tokens[0] contains first word of config line.
if (!strcmp(tokens[0], "alias")) {
struct arg_list *temp;
char aliase[MODNAME_LEN], *realname;
if (!tokens[2]) continue;
path2mod(tokens[1], aliase);
for (temp = TT.probes; temp; temp = temp->next) {
modent = (struct module_s *) temp->arg;
if (fnmatch(aliase, modent->name, 0)) continue;
realname = path2mod(tokens[2], NULL);
llist_add(&modent->rnames, realname);
if (modent->flags & MOD_NDDEPS) {
modent->flags &= ~MOD_NDDEPS;
TT.nudeps--;
}
modent = get_mod(realname, 1);
if (!(modent->flags & MOD_NDDEPS)) {
modent->flags |= MOD_NDDEPS;
TT.nudeps++;
}
}
} else if (!strcmp(tokens[0], "options")) {
if (!tokens[2]) continue;
modent = get_mod(tokens[1], 1);
modent->opts = add_opts(modent->opts, tokens[2]);
} else if (!strcmp(tokens[0], "include"))
dirtree_read(tokens[1], config_action);
else if (!strcmp(tokens[0], "blacklist"))
get_mod(tokens[1], 1)->flags |= MOD_BLACKLIST;
else if (!strcmp(tokens[0], "install")) continue;
else if (!strcmp(tokens[0], "remove")) continue;
else if (!FLAG(q))
error_msg("Invalid option %s found in file %s", tokens[0], filename);
}
fclose(fc);
free(filename);
return 0;
}
// Show matched modules else return -1 on failure.
static int depmode_read_entry(char *cmdname)
{
char *line;
int ret = -1;
FILE *fe = xfopen("modules.dep", "r");
while (read_line(fe, &line) > 0) {
char *tmp = strchr(line, ':');
if (tmp) {
*tmp = '\0';
char *name = basename(line);
tmp = strchr(name, '.');
if (tmp) *tmp = '\0';
if (!cmdname || !fnmatch(cmdname, name, 0)) {
if (tmp) *tmp = '.';
if (FLAG(v)) puts(line);
ret = 0;
}
}
free(line);
}
fclose(fe);
return ret;
}
// Finds dependencies for modules from the modules.dep file.
static void find_dep(void)
{
char *line = NULL;
struct module_s *mod;
FILE *fe = xfopen("modules.dep", "r");
for (; read_line(fe, &line) > 0; free(line)) {
char *tmp = strchr(line, ':');
if (tmp) {
*tmp = '\0';
mod = get_mod(line, 0);
if (!mod) continue;
if ((mod->flags & MOD_ALOADED) && !(FLAG(r)|FLAG(D))) continue;
mod->flags |= MOD_FNDDEPMOD;
if ((mod->flags & MOD_NDDEPS) && !mod->dep) {
TT.nudeps--;
llist_add(&mod->dep, xstrdup(line));
tmp++;
if (*tmp) {
char *tok;
while ((tok = strsep(&tmp, " \t"))) {
if (!*tok) continue;
llist_add_tail(&mod->dep, xstrdup(tok));
}
}
}
}
}
fclose(fe);
}
// Remove a module from the Linux Kernel. if !modules does auto remove.
static int rm_mod(char *modules, unsigned flags)
{
char *s;
if (modules && (s = strend(modules, ".ko"))) *s = 0;
errno = 0;
syscall(__NR_delete_module, modules, flags ? : O_NONBLOCK|O_EXCL);
return errno;
}
// Insert module same as insmod implementation.
static int ins_mod(char *modules, char *flags)
{
char *buf = NULL;
int len, res;
int fd = xopenro(modules);
while (flags && strlen(toybuf) + strlen(flags) + 2 < sizeof(toybuf)) {
strcat(toybuf, flags);
strcat(toybuf, " ");
}
#ifdef __NR_finit_module
res = syscall(__NR_finit_module, fd, toybuf, 0);
if (!res || errno != ENOSYS) {
xclose(fd);
return res;
}
#endif
// TODO xreadfile()
len = fdlength(fd);
buf = xmalloc(len);
xreadall(fd, buf, len);
xclose(fd);
res = syscall(__NR_init_module, buf, len, toybuf);
if (CFG_TOYBOX_FREE && buf != toybuf) free(buf);
return res;
}
// Add module in probes list, if not loaded.
static void add_mod(char *name)
{
struct module_s *mod = get_mod(name, 1);
if (!(FLAG(r)|FLAG(D)) && (mod->flags & MOD_ALOADED)) {
if (FLAG(v)) printf("%s already loaded\n", name);
return;
}
if (FLAG(v)) printf("queuing %s\n", name);
mod->cmdname = name;
mod->flags |= MOD_NDDEPS;
llist_add_tail(&TT.probes, mod);
TT.nudeps++;
if (!strncmp(mod->name, "symbol:", 7)) TT.symreq = 1;
}
// Parse cmdline options suplied for module.
static char *add_cmdopt(char **argv)
{
char *opt = xzalloc(1);
int lopt = 0;
while (*++argv) {
char *fmt, *var, *val;
var = *argv;
opt = xrealloc(opt, lopt + 2 + strlen(var) + 2);
// check for key=val or key = val.
fmt = "%.*s%s ";
for (val = var; *val && *val != '='; val++);
if (*val && strchr(++val, ' ')) fmt = "%.*s\"%s\" ";
lopt += sprintf(opt + lopt, fmt, (int) (val - var), var, val);
}
return opt;
}
// Probes a single module and loads all its dependencies.
static int go_probe(struct module_s *m)
{
int rc = 0, first = 1;
if (!(m->flags & MOD_FNDDEPMOD)) {
if (!FLAG(q)) error_msg("module %s not found in modules.dep", m->name);
return -ENOENT;
}
if (FLAG(v)) printf("go_prob'ing %s\n", m->name);
if (!FLAG(r)) m->dep = llist_rev(m->dep);
while (m->dep) {
struct module_s *m2;
char *fn, *options;
rc = 0;
fn = llist_popme(&m->dep);
m2 = get_mod(fn, 1);
// are we removing ?
if (FLAG(r)) {
if (m2->flags & MOD_ALOADED) {
if ((rc = rm_mod(m2->name, O_EXCL))) {
if (first) {
perror_msg("can't unload module %s", m2->name);
break;
}
} else m2->flags &= ~MOD_ALOADED;
}
first = 0;
continue;
}
// TODO how does free work here without leaking?
options = m2->opts;
m2->opts = NULL;
if (m == m2) options = add_opts(options, TT.cmdopts);
// are we only checking dependencies ?
if (FLAG(D)) {
if (FLAG(v))
printf(options ? "insmod %s %s\n" : "insmod %s\n", fn, options);
if (options) free(options);
continue;
}
if (m2->flags & MOD_ALOADED) {
if (FLAG(v)) printf("%s already loaded\n", fn);
if (options) free(options);
continue;
}
// none of above is true insert the module.
errno = 0;
rc = ins_mod(fn, options);
if (FLAG(v))
printf("loaded %s '%s': %s\n", fn, options, strerror(errno));
if (errno == EEXIST) rc = 0;
free(options);
if (rc) {
perror_msg("can't load module %s (%s)", m2->name, fn);
break;
}
m2->flags |= MOD_ALOADED;
}
return rc;
}
void modprobe_main(void)
{
char **argv = toys.optargs, *procline = NULL;
FILE *fs;
struct module_s *module;
struct arg_list *dirs;
if (toys.optc<1 && !FLAG(r) == !FLAG(l)) help_exit("bad syntax");
// Check for -r flag without arg if yes then do auto remove.
if (FLAG(r) && !toys.optc) {
if (rm_mod(0, O_NONBLOCK|O_EXCL)) perror_exit("rmmod");
return;
}
if (!TT.dirs) {
struct utsname uts;
uname(&uts);
TT.dirs = xzalloc(sizeof(struct arg_list));
TT.dirs->arg = xmprintf("/lib/modules/%s", uts.release);
}
// modules.dep processing for dependency check.
if (FLAG(l)) {
for (dirs = TT.dirs; dirs; dirs = dirs->next) {
xchdir(dirs->arg);
if (!depmode_read_entry(*toys.optargs)) return;
}
error_exit("no module found.");
}
// Read /proc/modules to get loaded modules.
fs = xfopen("/proc/modules", "r");
while (read_line(fs, &procline) > 0) {
*strchr(procline, ' ') = 0;
get_mod(procline, 1)->flags = MOD_ALOADED;
free(procline);
procline = NULL;
}
fclose(fs);
if (FLAG(a) || FLAG(r)) while (argv) add_mod(*argv++);
else {
add_mod(*argv);
TT.cmdopts = add_cmdopt(argv);
}
if (!TT.probes) {
if (FLAG(v)) puts("All modules loaded");
return;
}
dirtree_flagread("/etc/modprobe.conf", DIRTREE_SHUTUP, config_action);
dirtree_flagread("/etc/modprobe.d", DIRTREE_SHUTUP, config_action);
for (dirs = TT.dirs; dirs; dirs = dirs->next) {
xchdir(dirs->arg);
if (TT.symreq) dirtree_read("modules.symbols", config_action);
if (TT.nudeps) dirtree_read("modules.alias", config_action);
}
for (dirs = TT.dirs; dirs; dirs = dirs->next) {
xchdir(dirs->arg);
find_dep();
}
while ((module = llist_popme(&TT.probes))) {
if (!module->rnames) {
if (FLAG(v)) puts("probing by module name");
/* This is not an alias. Literal names are blacklisted
* only if '-b' is given.
*/
if (!FLAG(b) || !(module->flags & MOD_BLACKLIST))
go_probe(module);
continue;
}
do { // Probe all real names for the alias.
char *real = ((struct arg_list *)llist_pop(&module->rnames))->arg;
struct module_s *m2 = get_mod(real, 0);
if (FLAG(v))
printf("probing alias %s by realname %s\n", module->name, real);
if (!m2) continue;
if (!(m2->flags & MOD_BLACKLIST)
&& (!(m2->flags & MOD_ALOADED) || FLAG(r) || FLAG(D)))
go_probe(m2);
free(real);
} while (module->rnames);
}
}