diff options
| -rw-r--r-- | modutils/modprobe.c | 159 | ||||
| -rw-r--r-- | modutils/modutils.c | 65 | ||||
| -rw-r--r-- | modutils/modutils.h | 12 |
3 files changed, 143 insertions, 93 deletions
diff --git a/modutils/modprobe.c b/modutils/modprobe.c index d000c91..cfc16cb 100644 --- a/modutils/modprobe.c +++ b/modutils/modprobe.c @@ -9,10 +9,9 @@ */ /* Note that unlike older versions of modules.dep/depmod (busybox and m-i-t), - * we expect the full dependency list to be specified in modules.dep. Older - * versions would only export the direct dependency list. + * we expect the full dependency list to be specified in modules.dep. + * Older versions would only export the direct dependency list. */ - #include "libbb.h" #include "modutils.h" #include <sys/utsname.h> @@ -21,11 +20,11 @@ //#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__) #define DBG(...) ((void)0) -#define MODULE_FLAG_LOADED 0x0001 -#define MODULE_FLAG_NEED_DEPS 0x0002 +#define MODULE_FLAG_LOADED 0x0001 +#define MODULE_FLAG_NEED_DEPS 0x0002 /* "was seen in modules.dep": */ -#define MODULE_FLAG_FOUND_IN_MODDEP 0x0004 -#define MODULE_FLAG_BLACKLISTED 0x0008 +#define MODULE_FLAG_FOUND_IN_MODDEP 0x0004 +#define MODULE_FLAG_BLACKLISTED 0x0008 struct module_entry { /* I'll call it ME. */ unsigned flags; @@ -38,18 +37,30 @@ struct module_entry { /* I'll call it ME. */ llist_t *deps; /* strings. modules we depend on */ }; +/* NB: INSMOD_OPT_SILENT bit suppresses ONLY non-existent modules, + * not deleted ones (those are still listed in modules.dep). + * module-init-tools version 3.4: + * # modprobe bogus + * FATAL: Module bogus not found. [exitcode 1] + * # modprobe -q bogus [silent, exitcode still 1] + * but: + * # rm kernel/drivers/net/dummy.ko + * # modprobe -q dummy + * FATAL: Could not open '/lib/modules/xxx/kernel/drivers/net/dummy.ko': No such file or directory + * [exitcode 1] + */ #define MODPROBE_OPTS "acdlnrt:VC:" IF_FEATURE_MODPROBE_BLACKLIST("b") enum { - MODPROBE_OPT_INSERT_ALL = (INSMOD_OPT_UNUSED << 0), /* a */ - MODPROBE_OPT_DUMP_ONLY = (INSMOD_OPT_UNUSED << 1), /* c */ - MODPROBE_OPT_D = (INSMOD_OPT_UNUSED << 2), /* d */ - MODPROBE_OPT_LIST_ONLY = (INSMOD_OPT_UNUSED << 3), /* l */ - MODPROBE_OPT_SHOW_ONLY = (INSMOD_OPT_UNUSED << 4), /* n */ - MODPROBE_OPT_REMOVE = (INSMOD_OPT_UNUSED << 5), /* r */ - MODPROBE_OPT_RESTRICT = (INSMOD_OPT_UNUSED << 6), /* t */ - MODPROBE_OPT_VERONLY = (INSMOD_OPT_UNUSED << 7), /* V */ - MODPROBE_OPT_CONFIGFILE = (INSMOD_OPT_UNUSED << 8), /* C */ - MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 9) * ENABLE_FEATURE_MODPROBE_BLACKLIST, + MODPROBE_OPT_INSERT_ALL = (INSMOD_OPT_UNUSED << 0), /* a */ + MODPROBE_OPT_DUMP_ONLY = (INSMOD_OPT_UNUSED << 1), /* c */ + MODPROBE_OPT_D = (INSMOD_OPT_UNUSED << 2), /* d */ + MODPROBE_OPT_LIST_ONLY = (INSMOD_OPT_UNUSED << 3), /* l */ + MODPROBE_OPT_SHOW_ONLY = (INSMOD_OPT_UNUSED << 4), /* n */ + MODPROBE_OPT_REMOVE = (INSMOD_OPT_UNUSED << 5), /* r */ + MODPROBE_OPT_RESTRICT = (INSMOD_OPT_UNUSED << 6), /* t */ + MODPROBE_OPT_VERONLY = (INSMOD_OPT_UNUSED << 7), /* V */ + MODPROBE_OPT_CONFIGFILE = (INSMOD_OPT_UNUSED << 8), /* C */ + MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 9) * ENABLE_FEATURE_MODPROBE_BLACKLIST, }; struct globals { @@ -140,7 +151,7 @@ static int FAST_FUNC config_file_action(const char *filename, { char *tokens[3]; parser_t *p; - struct module_entry *m; + struct module_entry *m; int rc = TRUE; if (bb_basename(filename)[0] == '.') @@ -199,7 +210,7 @@ static int FAST_FUNC config_file_action(const char *filename, } } config_close(p); -error: + error: return rc; } @@ -209,6 +220,11 @@ static int read_config(const char *path) config_file_action, NULL, NULL, 1); } +/* Return: similar to bb_init_module: + * 0 on success, + * -errno on open/read error, + * errno on init_module() error + */ static int do_modprobe(struct module_entry *m) { struct module_entry *m2 = m2; /* for compiler */ @@ -217,7 +233,8 @@ static int do_modprobe(struct module_entry *m) llist_t *l; if (!(m->flags & MODULE_FLAG_FOUND_IN_MODDEP)) { - DBG("skipping %s, not found in modules.dep", m->modname); + if (!(option_mask32 & INSMOD_OPT_SILENT)) + bb_error_msg("module %s not found in modules.dep", m->probed_name); return -ENOENT; } DBG("do_modprob'ing %s", m->modname); @@ -230,43 +247,52 @@ static int do_modprobe(struct module_entry *m) first = 1; rc = 0; - while (m->deps && rc == 0) { - fn = llist_pop(&m->deps); + while (m->deps) { + rc = 0; + fn = llist_pop(&m->deps); /* we leak it */ m2 = get_or_add_modentry(fn); + if (option_mask32 & MODPROBE_OPT_REMOVE) { + /* modprobe -r */ if (m2->flags & MODULE_FLAG_LOADED) { - if (bb_delete_module(m2->modname, O_EXCL) != 0) { - if (first) - rc = errno; + rc = bb_delete_module(m2->modname, O_EXCL); + if (rc) { + if (first) { + bb_error_msg("failed to unload module %s: %s", + m2->probed_name ? m2->probed_name : m2->modname, + moderror(rc)); + break; + } } else { m2->flags &= ~MODULE_FLAG_LOADED; } } /* do not error out if *deps* fail to unload */ first = 0; - } else if (!(m2->flags & MODULE_FLAG_LOADED)) { - options = m2->options; - m2->options = NULL; - if (m == m2) - options = gather_options_str(options, G.cmdline_mopts); - rc = bb_init_module(fn, options); - DBG("loaded %s '%s', rc:%d", fn, options, rc); - if (rc == 0) - m2->flags |= MODULE_FLAG_LOADED; - free(options); - } else { - DBG("%s is already loaded, skipping", fn); + continue; } - free(fn); - } + if (m2->flags & MODULE_FLAG_LOADED) { + DBG("%s is already loaded, skipping", fn); + continue; + } - if (rc && !(option_mask32 & INSMOD_OPT_SILENT)) { - bb_error_msg("failed to %sload module %s: %s", - (option_mask32 & MODPROBE_OPT_REMOVE) ? "un" : "", + options = m2->options; + m2->options = NULL; + if (m == m2) + options = gather_options_str(options, G.cmdline_mopts); + rc = bb_init_module(fn, options); + DBG("loaded %s '%s', rc:%d", fn, options, rc); + free(options); + if (rc) { + bb_error_msg("failed to load module %s (%s): %s", m2->probed_name ? m2->probed_name : m2->modname, - moderror(rc) - ); + fn, + moderror(rc) + ); + break; + } + m2->flags |= MODULE_FLAG_LOADED; } return rc; @@ -278,7 +304,7 @@ static void load_modules_dep(void) char *colon, *tokens[2]; parser_t *p; - /* Modprobe does not work at all without modprobe.dep, + /* Modprobe does not work at all without modules.dep, * even if the full module name is given. Returning error here * was making us later confuse user with this message: * "module /full/path/to/existing/file/module.ko not found". @@ -387,35 +413,40 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv) load_modules_dep(); } + rc = 0; while ((me = llist_pop(&G.probes)) != NULL) { if (me->realnames == NULL) { + DBG("probing by module name"); /* This is not an alias. Literal names are blacklisted * only if '-b' is given. */ if (!(opt & MODPROBE_OPT_BLACKLIST) || !(me->flags & MODULE_FLAG_BLACKLISTED) ) { - rc = do_modprobe(me); -//FIXME: what if rc > 0? - if (rc < 0 && !(opt & INSMOD_OPT_SILENT)) - bb_error_msg("module %s not found", - me->probed_name); + rc |= do_modprobe(me); } - } else { - /* Probe all realnames */ - do { - char *realname = llist_pop(&me->realnames); - struct module_entry *m2; - - DBG("probing %s by realname %s", me->modname, realname); - m2 = get_or_add_modentry(realname); - if (!(m2->flags & MODULE_FLAG_BLACKLISTED)) - do_modprobe(m2); -//FIXME: error check? - free(realname); - } while (me->realnames != NULL); + continue; } + + /* Probe all real names for the alias */ + do { + char *realname = llist_pop(&me->realnames); + struct module_entry *m2; + + DBG("probing alias %s by realname %s", me->modname, realname); + m2 = get_or_add_modentry(realname); + if (!(m2->flags & MODULE_FLAG_BLACKLISTED) + && (!(m2->flags & MODULE_FLAG_LOADED) + || (opt & MODPROBE_OPT_REMOVE)) + ) { +//TODO: we can pass "me" as 2nd param to do_modprobe, +//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 EXIT_SUCCESS; + return (rc != 0); } diff --git a/modutils/modutils.c b/modutils/modutils.c index f437a98..969926d 100644 --- a/modutils/modutils.c +++ b/modutils/modutils.c @@ -25,7 +25,7 @@ void FAST_FUNC replace(char *s, char what, char with) } } -char * FAST_FUNC replace_underscores(char *s) +char* FAST_FUNC replace_underscores(char *s) { replace(s, '-', '_'); return s; @@ -45,7 +45,7 @@ int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim) return len; } -char * FAST_FUNC filename2modname(const char *filename, char *modname) +char* FAST_FUNC filename2modname(const char *filename, char *modname) { int i; char *from; @@ -62,24 +62,6 @@ char * FAST_FUNC filename2modname(const char *filename, char *modname) return modname; } -const char * FAST_FUNC moderror(int err) -{ - switch (err) { - case -1: - return "no such module"; - case ENOEXEC: - return "invalid module format"; - case ENOENT: - return "unknown symbol in module, or unknown parameter"; - case ESRCH: - return "module has wrong symbol version"; - case ENOSYS: - return "kernel does not support requested operation"; - default: - return strerror(err); - } -} - char * FAST_FUNC parse_cmdline_module_options(char **argv) { char *options; @@ -95,6 +77,11 @@ char * FAST_FUNC parse_cmdline_module_options(char **argv) return options; } +/* Return: + * 0 on success, + * -errno on open/read error, + * errno on init_module() error + */ int FAST_FUNC bb_init_module(const char *filename, const char *options) { size_t len; @@ -104,6 +91,7 @@ int FAST_FUNC bb_init_module(const char *filename, const char *options) if (!options) options = ""; +//TODO: audit bb_init_module_24 to match error code convention #if ENABLE_FEATURE_2_4_MODULES if (get_linux_version_code() < KERNEL_VERSION(2,6,0)) return bb_init_module_24(filename, options); @@ -111,19 +99,40 @@ int FAST_FUNC bb_init_module(const char *filename, const char *options) /* Use the 2.6 way */ len = INT_MAX - 4095; - rc = ENOENT; + errno = ENOMEM; /* may be changed by e.g. open errors below */ image = xmalloc_open_zipped_read_close(filename, &len); - if (image) { - rc = 0; - if (init_module(image, len, options) != 0) - rc = errno; - free(image); - } + if (!image) + return -errno; + errno = 0; + init_module(image, len, options); + rc = errno; + free(image); return rc; } int FAST_FUNC bb_delete_module(const char *module, unsigned int flags) { - return delete_module(module, flags); + errno = 0; + delete_module(module, flags); + return errno; +} + +const char* FAST_FUNC moderror(int err) +{ + switch (err) { + case -1: /* btw: it's -EPERM */ + return "no such module"; + case ENOEXEC: + return "invalid module format"; + case ENOENT: + return "unknown symbol in module, or unknown parameter"; + case ESRCH: + return "module has wrong symbol version"; + case ENOSYS: + return "kernel does not support requested operation"; + } + if (err < 0) /* should always be */ + err = -err; + return strerror(err); } diff --git a/modutils/modutils.h b/modutils/modutils.h index 8cca5cc..1cf4bba 100644 --- a/modutils/modutils.h +++ b/modutils/modutils.h @@ -17,7 +17,6 @@ PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN * internally for the maximum alias name length, which can be quite long */ #define MODULE_NAME_LEN 256 -const char *moderror(int err) FAST_FUNC; void replace(char *s, char what, char with) FAST_FUNC; char *replace_underscores(char *s) FAST_FUNC; int string_to_llist(char *string, llist_t **llist, const char *delim) FAST_FUNC; @@ -52,8 +51,19 @@ enum { #endif }; +/* Return: + * 0 on success, + * -errno on open/read error, + * errno on init_module() error + */ int FAST_FUNC bb_init_module(const char *module, const char *options); +/* Return: + * 0 on success, + * errno on init_module() error + */ int FAST_FUNC bb_delete_module(const char *module, unsigned int flags); +/* Translates error return to a string */ +const char *moderror(int err) FAST_FUNC; #if ENABLE_FEATURE_2_4_MODULES int FAST_FUNC bb_init_module_24(const char *module, const char *options); |