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197202d435
function old new delta do_modprobe 365 520 +155 parse_and_add_kcmdline_module_options 149 - -149 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
496 lines
13 KiB
C
496 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Modprobe written from scratch for BusyBox
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*
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* Copyright (c) 2008 Timo Teras <timo.teras@iki.fi>
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* Copyright (c) 2008 Vladimir Dronnikov
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* Note that unlike older versions of modules.dep/depmod (busybox and m-i-t),
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* we expect the full dependency list to be specified in modules.dep.
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* Older versions would only export the direct dependency list.
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*/
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#include "libbb.h"
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#include "modutils.h"
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#include <sys/utsname.h>
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#include <fnmatch.h>
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//#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
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#define DBG(...) ((void)0)
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#define MODULE_FLAG_LOADED 0x0001
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#define MODULE_FLAG_NEED_DEPS 0x0002
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/* "was seen in modules.dep": */
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#define MODULE_FLAG_FOUND_IN_MODDEP 0x0004
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#define MODULE_FLAG_BLACKLISTED 0x0008
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struct module_entry { /* I'll call it ME. */
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unsigned flags;
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char *modname; /* stripped of /path/, .ext and s/-/_/g */
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const char *probed_name; /* verbatim as seen on cmdline */
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char *options; /* options from config files */
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llist_t *realnames; /* strings. if this module is an alias, */
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/* real module name is one of these. */
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//Can there really be more than one? Example from real kernel?
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llist_t *deps; /* strings. modules we depend on */
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};
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/* NB: INSMOD_OPT_SILENT bit suppresses ONLY non-existent modules,
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* not deleted ones (those are still listed in modules.dep).
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* module-init-tools version 3.4:
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* # modprobe bogus
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* FATAL: Module bogus not found. [exitcode 1]
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* # modprobe -q bogus [silent, exitcode still 1]
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* but:
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* # rm kernel/drivers/net/dummy.ko
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* # modprobe -q dummy
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* FATAL: Could not open '/lib/modules/xxx/kernel/drivers/net/dummy.ko': No such file or directory
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* [exitcode 1]
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*/
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#define MODPROBE_OPTS "acdlnrt:VC:" IF_FEATURE_MODPROBE_BLACKLIST("b")
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enum {
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MODPROBE_OPT_INSERT_ALL = (INSMOD_OPT_UNUSED << 0), /* a */
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MODPROBE_OPT_DUMP_ONLY = (INSMOD_OPT_UNUSED << 1), /* c */
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MODPROBE_OPT_D = (INSMOD_OPT_UNUSED << 2), /* d */
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MODPROBE_OPT_LIST_ONLY = (INSMOD_OPT_UNUSED << 3), /* l */
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MODPROBE_OPT_SHOW_ONLY = (INSMOD_OPT_UNUSED << 4), /* n */
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MODPROBE_OPT_REMOVE = (INSMOD_OPT_UNUSED << 5), /* r */
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MODPROBE_OPT_RESTRICT = (INSMOD_OPT_UNUSED << 6), /* t */
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MODPROBE_OPT_VERONLY = (INSMOD_OPT_UNUSED << 7), /* V */
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MODPROBE_OPT_CONFIGFILE = (INSMOD_OPT_UNUSED << 8), /* C */
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MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 9) * ENABLE_FEATURE_MODPROBE_BLACKLIST,
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};
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struct globals {
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llist_t *db; /* MEs of all modules ever seen (caching for speed) */
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llist_t *probes; /* MEs of module(s) requested on cmdline */
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char *cmdline_mopts; /* module options from cmdline */
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int num_unresolved_deps;
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/* bool. "Did we have 'symbol:FOO' requested on cmdline?" */
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smallint need_symbols;
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() do { } while (0)
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static int read_config(const char *path);
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static char *gather_options_str(char *opts, const char *append)
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{
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/* Speed-optimized. We call gather_options_str many times. */
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if (append) {
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if (opts == NULL) {
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opts = xstrdup(append);
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} else {
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int optlen = strlen(opts);
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opts = xrealloc(opts, optlen + strlen(append) + 2);
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sprintf(opts + optlen, " %s", append);
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}
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}
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return opts;
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}
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static struct module_entry *helper_get_module(const char *module, int create)
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{
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char modname[MODULE_NAME_LEN];
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struct module_entry *e;
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llist_t *l;
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filename2modname(module, modname);
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for (l = G.db; l != NULL; l = l->link) {
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e = (struct module_entry *) l->data;
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if (strcmp(e->modname, modname) == 0)
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return e;
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}
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if (!create)
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return NULL;
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e = xzalloc(sizeof(*e));
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e->modname = xstrdup(modname);
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llist_add_to(&G.db, e);
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return e;
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}
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static struct module_entry *get_or_add_modentry(const char *module)
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{
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return helper_get_module(module, 1);
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}
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static struct module_entry *get_modentry(const char *module)
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{
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return helper_get_module(module, 0);
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}
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static void add_probe(const char *name)
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{
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struct module_entry *m;
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m = get_or_add_modentry(name);
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if (!(option_mask32 & MODPROBE_OPT_REMOVE)
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&& (m->flags & MODULE_FLAG_LOADED)
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) {
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DBG("skipping %s, it is already loaded", name);
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return;
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}
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DBG("queuing %s", name);
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m->probed_name = name;
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m->flags |= MODULE_FLAG_NEED_DEPS;
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llist_add_to_end(&G.probes, m);
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G.num_unresolved_deps++;
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if (ENABLE_FEATURE_MODUTILS_SYMBOLS
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&& strncmp(m->modname, "symbol:", 7) == 0
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) {
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G.need_symbols = 1;
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}
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}
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static int FAST_FUNC config_file_action(const char *filename,
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struct stat *statbuf UNUSED_PARAM,
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void *userdata UNUSED_PARAM,
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int depth UNUSED_PARAM)
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{
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char *tokens[3];
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parser_t *p;
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struct module_entry *m;
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int rc = TRUE;
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if (bb_basename(filename)[0] == '.')
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goto error;
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p = config_open2(filename, fopen_for_read);
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if (p == NULL) {
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rc = FALSE;
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goto error;
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}
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while (config_read(p, tokens, 3, 2, "# \t", PARSE_NORMAL)) {
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//Use index_in_strings?
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if (strcmp(tokens[0], "alias") == 0) {
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/* alias <wildcard> <modulename> */
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llist_t *l;
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char wildcard[MODULE_NAME_LEN];
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char *rmod;
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if (tokens[2] == NULL)
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continue;
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filename2modname(tokens[1], wildcard);
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for (l = G.probes; l != NULL; l = l->link) {
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m = (struct module_entry *) l->data;
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if (fnmatch(wildcard, m->modname, 0) != 0)
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continue;
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rmod = filename2modname(tokens[2], NULL);
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llist_add_to(&m->realnames, rmod);
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if (m->flags & MODULE_FLAG_NEED_DEPS) {
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m->flags &= ~MODULE_FLAG_NEED_DEPS;
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G.num_unresolved_deps--;
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}
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m = get_or_add_modentry(rmod);
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if (!(m->flags & MODULE_FLAG_NEED_DEPS)) {
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m->flags |= MODULE_FLAG_NEED_DEPS;
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G.num_unresolved_deps++;
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}
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}
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} else if (strcmp(tokens[0], "options") == 0) {
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/* options <modulename> <option...> */
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if (tokens[2] == NULL)
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continue;
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m = get_or_add_modentry(tokens[1]);
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m->options = gather_options_str(m->options, tokens[2]);
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} else if (strcmp(tokens[0], "include") == 0) {
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/* include <filename> */
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read_config(tokens[1]);
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} else if (ENABLE_FEATURE_MODPROBE_BLACKLIST
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&& strcmp(tokens[0], "blacklist") == 0
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) {
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/* blacklist <modulename> */
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get_or_add_modentry(tokens[1])->flags |= MODULE_FLAG_BLACKLISTED;
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}
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}
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config_close(p);
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error:
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return rc;
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}
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static int read_config(const char *path)
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{
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return recursive_action(path, ACTION_RECURSE | ACTION_QUIET,
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config_file_action, NULL, NULL, 1);
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}
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static const char *humanly_readable_name(struct module_entry *m)
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{
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/* probed_name may be NULL. modname always exists. */
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return m->probed_name ? m->probed_name : m->modname;
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}
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static char *parse_and_add_kcmdline_module_options(char *options, const char *modulename)
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{
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char *kcmdline_buf;
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char *kcmdline;
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char *kptr;
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int len;
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kcmdline_buf = xmalloc_open_read_close("/proc/cmdline", NULL);
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if (!kcmdline_buf)
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return options;
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kcmdline = kcmdline_buf;
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len = strlen(modulename);
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while ((kptr = strsep(&kcmdline, "\n\t ")) != NULL) {
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if (strncmp(modulename, kptr, len) != 0)
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continue;
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kptr += len;
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if (*kptr != '.')
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continue;
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/* It is "modulename.xxxx" */
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kptr++;
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if (strchr(kptr, '=') != NULL) {
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/* It is "modulename.opt=[val]" */
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options = gather_options_str(options, kptr);
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}
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}
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free(kcmdline_buf);
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return options;
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}
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/* Return: similar to bb_init_module:
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* 0 on success,
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* -errno on open/read error,
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* errno on init_module() error
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*/
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static int do_modprobe(struct module_entry *m)
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{
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struct module_entry *m2 = m2; /* for compiler */
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char *fn, *options;
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int rc, first;
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llist_t *l;
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if (!(m->flags & MODULE_FLAG_FOUND_IN_MODDEP)) {
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if (!(option_mask32 & INSMOD_OPT_SILENT))
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bb_error_msg("module %s not found in modules.dep",
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humanly_readable_name(m));
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return -ENOENT;
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}
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DBG("do_modprob'ing %s", m->modname);
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if (!(option_mask32 & MODPROBE_OPT_REMOVE))
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m->deps = llist_rev(m->deps);
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for (l = m->deps; l != NULL; l = l->link)
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DBG("dep: %s", l->data);
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first = 1;
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rc = 0;
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while (m->deps) {
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rc = 0;
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fn = llist_pop(&m->deps); /* we leak it */
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m2 = get_or_add_modentry(fn);
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if (option_mask32 & MODPROBE_OPT_REMOVE) {
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/* modprobe -r */
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if (m2->flags & MODULE_FLAG_LOADED) {
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rc = bb_delete_module(m2->modname, O_EXCL);
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if (rc) {
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if (first) {
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bb_error_msg("failed to unload module %s: %s",
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humanly_readable_name(m2),
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moderror(rc));
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break;
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}
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} else {
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m2->flags &= ~MODULE_FLAG_LOADED;
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}
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}
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/* do not error out if *deps* fail to unload */
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first = 0;
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continue;
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}
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if (m2->flags & MODULE_FLAG_LOADED) {
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DBG("%s is already loaded, skipping", fn);
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continue;
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}
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options = m2->options;
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m2->options = NULL;
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options = parse_and_add_kcmdline_module_options(options, m2->modname);
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if (m == m2)
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options = gather_options_str(options, G.cmdline_mopts);
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rc = bb_init_module(fn, options);
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DBG("loaded %s '%s', rc:%d", fn, options, rc);
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if (rc == EEXIST)
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rc = 0;
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free(options);
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if (rc) {
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bb_error_msg("failed to load module %s (%s): %s",
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humanly_readable_name(m2),
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fn,
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moderror(rc)
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);
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break;
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}
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m2->flags |= MODULE_FLAG_LOADED;
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}
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return rc;
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}
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static void load_modules_dep(void)
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{
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struct module_entry *m;
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char *colon, *tokens[2];
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parser_t *p;
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/* Modprobe does not work at all without modules.dep,
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* even if the full module name is given. Returning error here
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* was making us later confuse user with this message:
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* "module /full/path/to/existing/file/module.ko not found".
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* It's better to die immediately, with good message.
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* xfopen_for_read provides that. */
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p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, xfopen_for_read);
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while (G.num_unresolved_deps
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&& config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)
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) {
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colon = last_char_is(tokens[0], ':');
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if (colon == NULL)
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continue;
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*colon = 0;
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m = get_modentry(tokens[0]);
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if (m == NULL)
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continue;
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/* Optimization... */
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if ((m->flags & MODULE_FLAG_LOADED)
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&& !(option_mask32 & MODPROBE_OPT_REMOVE)
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) {
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DBG("skip deps of %s, it's already loaded", tokens[0]);
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continue;
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}
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m->flags |= MODULE_FLAG_FOUND_IN_MODDEP;
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if ((m->flags & MODULE_FLAG_NEED_DEPS) && (m->deps == NULL)) {
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G.num_unresolved_deps--;
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llist_add_to(&m->deps, xstrdup(tokens[0]));
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if (tokens[1])
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string_to_llist(tokens[1], &m->deps, " \t");
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} else
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DBG("skipping dep line");
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}
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config_close(p);
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}
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int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int modprobe_main(int argc UNUSED_PARAM, char **argv)
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{
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struct utsname uts;
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int rc;
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unsigned opt;
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struct module_entry *me;
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opt_complementary = "q-v:v-q";
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opt = getopt32(argv, INSMOD_OPTS MODPROBE_OPTS INSMOD_ARGS, NULL, NULL);
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argv += optind;
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if (opt & (MODPROBE_OPT_DUMP_ONLY | MODPROBE_OPT_LIST_ONLY |
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MODPROBE_OPT_SHOW_ONLY))
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bb_error_msg_and_die("not supported");
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if (!argv[0]) {
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if (opt & MODPROBE_OPT_REMOVE) {
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/* "modprobe -r" (w/o params).
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* "If name is NULL, all unused modules marked
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* autoclean will be removed".
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*/
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if (bb_delete_module(NULL, O_NONBLOCK | O_EXCL) != 0)
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bb_perror_msg_and_die("rmmod");
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}
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return EXIT_SUCCESS;
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}
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/* Goto modules location */
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xchdir(CONFIG_DEFAULT_MODULES_DIR);
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uname(&uts);
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xchdir(uts.release);
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/* Retrieve module names of already loaded modules */
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{
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char *s;
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parser_t *parser = config_open2("/proc/modules", fopen_for_read);
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while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY))
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get_or_add_modentry(s)->flags |= MODULE_FLAG_LOADED;
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config_close(parser);
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}
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if (opt & (MODPROBE_OPT_INSERT_ALL | MODPROBE_OPT_REMOVE)) {
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/* Each argument is a module name */
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do {
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DBG("adding module %s", *argv);
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add_probe(*argv++);
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} while (*argv);
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} else {
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/* First argument is module name, rest are parameters */
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DBG("probing just module %s", *argv);
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add_probe(argv[0]);
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G.cmdline_mopts = parse_cmdline_module_options(argv);
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}
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/* Happens if all requested modules are already loaded */
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if (G.probes == NULL)
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return EXIT_SUCCESS;
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read_config("/etc/modprobe.conf");
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read_config("/etc/modprobe.d");
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if (ENABLE_FEATURE_MODUTILS_SYMBOLS && G.need_symbols)
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read_config("modules.symbols");
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load_modules_dep();
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if (ENABLE_FEATURE_MODUTILS_ALIAS && G.num_unresolved_deps) {
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read_config("modules.alias");
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load_modules_dep();
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}
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rc = 0;
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while ((me = llist_pop(&G.probes)) != NULL) {
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if (me->realnames == NULL) {
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DBG("probing by module name");
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/* This is not an alias. Literal names are blacklisted
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* only if '-b' is given.
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*/
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if (!(opt & MODPROBE_OPT_BLACKLIST)
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|| !(me->flags & MODULE_FLAG_BLACKLISTED)
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) {
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rc |= do_modprobe(me);
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}
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continue;
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}
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/* Probe all real names for the alias */
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do {
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char *realname = llist_pop(&me->realnames);
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struct module_entry *m2;
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DBG("probing alias %s by realname %s", me->modname, realname);
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m2 = get_or_add_modentry(realname);
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if (!(m2->flags & MODULE_FLAG_BLACKLISTED)
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&& (!(m2->flags & MODULE_FLAG_LOADED)
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|| (opt & MODPROBE_OPT_REMOVE))
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) {
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//TODO: we can pass "me" as 2nd param to do_modprobe,
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//and make do_modprobe emit more meaningful error messages
|
|
//with alias name included, not just module name alias resolves to.
|
|
rc |= do_modprobe(m2);
|
|
}
|
|
free(realname);
|
|
} while (me->realnames != NULL);
|
|
}
|
|
|
|
return (rc != 0);
|
|
}
|