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Fixed some goofs in help text function old new delta modprobe_main 494 653 +159 packed_usage 27129 27145 +16 insmod_main 98 95 -3 Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
605 lines
18 KiB
C
605 lines
18 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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//usage:#if !ENABLE_MODPROBE_SMALL
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//usage:#define modprobe_notes_usage
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//usage: "modprobe can (un)load a stack of modules, passing each module options (when\n"
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//usage: "loading). modprobe uses a configuration file to determine what option(s) to\n"
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//usage: "pass each module it loads.\n"
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//usage: "\n"
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//usage: "The configuration file is searched (in this order):\n"
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//usage: "\n"
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//usage: " /etc/modprobe.conf (2.6 only)\n"
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//usage: " /etc/modules.conf\n"
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//usage: " /etc/conf.modules (deprecated)\n"
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//usage: "\n"
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//usage: "They all have the same syntax (see below). If none is present, it is\n"
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//usage: "_not_ an error; each loaded module is then expected to load without\n"
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//usage: "options. Once a file is found, the others are tested for.\n"
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//usage: "\n"
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//usage: "/etc/modules.conf entry format:\n"
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//usage: "\n"
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//usage: " alias <alias_name> <mod_name>\n"
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//usage: " Makes it possible to modprobe alias_name, when there is no such module.\n"
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//usage: " It makes sense if your mod_name is long, or you want a more representative\n"
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//usage: " name for that module (eg. 'scsi' in place of 'aha7xxx').\n"
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//usage: " This makes it also possible to use a different set of options (below) for\n"
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//usage: " the module and the alias.\n"
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//usage: " A module can be aliased more than once.\n"
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//usage: "\n"
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//usage: " options <mod_name|alias_name> <symbol=value...>\n"
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//usage: " When loading module mod_name (or the module aliased by alias_name), pass\n"
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//usage: " the \"symbol=value\" pairs as option to that module.\n"
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//usage: "\n"
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//usage: "Sample /etc/modules.conf file:\n"
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//usage: "\n"
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//usage: " options tulip irq=3\n"
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//usage: " alias tulip tulip2\n"
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//usage: " options tulip2 irq=4 io=0x308\n"
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//usage: "\n"
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//usage: "Other functionality offered by 'classic' modprobe is not available in\n"
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//usage: "this implementation.\n"
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//usage: "\n"
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//usage: "If module options are present both in the config file, and on the command line,\n"
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//usage: "then the options from the command line will be passed to the module _after_\n"
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//usage: "the options from the config file. That way, you can have defaults in the config\n"
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//usage: "file, and override them for a specific usage from the command line.\n"
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//usage:#define modprobe_example_usage
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//usage: "(with the above /etc/modules.conf):\n\n"
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//usage: "$ modprobe tulip\n"
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//usage: " will load the module 'tulip' with default option 'irq=3'\n\n"
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//usage: "$ modprobe tulip irq=5\n"
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//usage: " will load the module 'tulip' with option 'irq=5', thus overriding the default\n\n"
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//usage: "$ modprobe tulip2\n"
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//usage: " will load the module 'tulip' with default options 'irq=4 io=0x308',\n"
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//usage: " which are the default for alias 'tulip2'\n\n"
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//usage: "$ modprobe tulip2 irq=8\n"
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//usage: " will load the module 'tulip' with default options 'irq=4 io=0x308 irq=8',\n"
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//usage: " which are the default for alias 'tulip2' overridden by the option 'irq=8'\n\n"
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//usage: " from the command line\n\n"
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//usage: "$ modprobe tulip2 irq=2 io=0x210\n"
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//usage: " will load the module 'tulip' with default options 'irq=4 io=0x308 irq=4 io=0x210',\n"
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//usage: " which are the default for alias 'tulip2' overridden by the options 'irq=2 io=0x210'\n\n"
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//usage: " from the command line\n"
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//usage:
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//usage:#define modprobe_trivial_usage
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//usage: "[-alrqvs"
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//usage: IF_FEATURE_MODPROBE_BLACKLIST("b")
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//usage: "] MODULE [symbol=value]..."
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//usage:#define modprobe_full_usage "\n\n"
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//usage: "Options:"
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//usage: "\n -a Load multiple MODULEs"
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//usage: "\n -l List (MODULE is a pattern)"
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//usage: "\n -r Remove MODULE (stacks) or do autoclean"
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//usage: "\n -q Quiet"
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//usage: "\n -v Verbose"
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//usage: "\n -s Log to syslog"
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//usage: IF_FEATURE_MODPROBE_BLACKLIST(
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//usage: "\n -b Apply blacklist to module names too"
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//usage: )
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//usage:#endif /* !ENABLE_MODPROBE_SMALL */
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/* Note that usage text doesn't document various 2.4 options
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* we pull in through INSMOD_OPTS define */
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#define MODPROBE_COMPLEMENTARY "q-v:v-q:l--ar:a--lr:r--al"
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#define MODPROBE_OPTS "alr" IF_FEATURE_MODPROBE_BLACKLIST("b")
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//#define MODPROBE_COMPLEMENTARY "q-v:v-q:l--acr:a--lr:r--al"
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//#define MODPROBE_OPTS "acd:lnrt:C:" 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 << x), /* c */
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//MODPROBE_OPT_DIRNAME = (INSMOD_OPT_UNUSED << x), /* d */
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MODPROBE_OPT_LIST_ONLY = (INSMOD_OPT_UNUSED << 1), /* l */
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//MODPROBE_OPT_SHOW_ONLY= (INSMOD_OPT_UNUSED << x), /* n */
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MODPROBE_OPT_REMOVE = (INSMOD_OPT_UNUSED << 2), /* r */
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//MODPROBE_OPT_RESTRICT = (INSMOD_OPT_UNUSED << x), /* t */
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//MODPROBE_OPT_VERONLY = (INSMOD_OPT_UNUSED << x), /* V */
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//MODPROBE_OPT_CONFIGFILE=(INSMOD_OPT_UNUSED << x), /* C */
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MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 3) * ENABLE_FEATURE_MODPROBE_BLACKLIST,
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};
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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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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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/* 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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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("can't 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("can't 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], ':');
|
|
if (colon == NULL)
|
|
continue;
|
|
*colon = 0;
|
|
|
|
m = get_modentry(tokens[0]);
|
|
if (m == NULL)
|
|
continue;
|
|
|
|
/* Optimization... */
|
|
if ((m->flags & MODULE_FLAG_LOADED)
|
|
&& !(option_mask32 & MODPROBE_OPT_REMOVE)
|
|
) {
|
|
DBG("skip deps of %s, it's already loaded", tokens[0]);
|
|
continue;
|
|
}
|
|
|
|
m->flags |= MODULE_FLAG_FOUND_IN_MODDEP;
|
|
if ((m->flags & MODULE_FLAG_NEED_DEPS) && (m->deps == NULL)) {
|
|
G.num_unresolved_deps--;
|
|
llist_add_to(&m->deps, xstrdup(tokens[0]));
|
|
if (tokens[1])
|
|
string_to_llist(tokens[1], &m->deps, " \t");
|
|
} else
|
|
DBG("skipping dep line");
|
|
}
|
|
config_close(p);
|
|
}
|
|
|
|
int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int modprobe_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct utsname uts;
|
|
int rc;
|
|
unsigned opt;
|
|
struct module_entry *me;
|
|
|
|
opt_complementary = MODPROBE_COMPLEMENTARY;
|
|
opt = getopt32(argv, INSMOD_OPTS MODPROBE_OPTS INSMOD_ARGS);
|
|
argv += optind;
|
|
|
|
if (opt & MODPROBE_OPT_LIST_ONLY) {
|
|
char name[MODULE_NAME_LEN];
|
|
char *colon, *tokens[2];
|
|
parser_t *p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, xfopen_for_read);
|
|
|
|
while (config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
|
|
colon = last_char_is(tokens[0], ':');
|
|
if (!colon)
|
|
continue;
|
|
*colon = '\0';
|
|
filename2modname(tokens[0], name);
|
|
if (!argv[0])
|
|
puts(tokens[0]);
|
|
else {
|
|
int i;
|
|
for (i = 0; argv[i]; i++) {
|
|
if (fnmatch(argv[i], name, 0) == 0) {
|
|
puts(tokens[0]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* Yes, for some reason -l ignores -s... */
|
|
if (opt & INSMOD_OPT_SYSLOG)
|
|
logmode = LOGMODE_SYSLOG;
|
|
|
|
if (!argv[0]) {
|
|
if (opt & MODPROBE_OPT_REMOVE) {
|
|
/* "modprobe -r" (w/o params).
|
|
* "If name is NULL, all unused modules marked
|
|
* autoclean will be removed".
|
|
*/
|
|
if (bb_delete_module(NULL, O_NONBLOCK | O_EXCL) != 0)
|
|
bb_perror_msg_and_die("rmmod");
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* Goto modules location */
|
|
xchdir(CONFIG_DEFAULT_MODULES_DIR);
|
|
uname(&uts);
|
|
xchdir(uts.release);
|
|
|
|
/* Retrieve module names of already loaded modules */
|
|
{
|
|
char *s;
|
|
parser_t *parser = config_open2("/proc/modules", fopen_for_read);
|
|
while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY))
|
|
get_or_add_modentry(s)->flags |= MODULE_FLAG_LOADED;
|
|
config_close(parser);
|
|
}
|
|
|
|
if (opt & (MODPROBE_OPT_INSERT_ALL | MODPROBE_OPT_REMOVE)) {
|
|
/* Each argument is a module name */
|
|
do {
|
|
DBG("adding module %s", *argv);
|
|
add_probe(*argv++);
|
|
} while (*argv);
|
|
} else {
|
|
/* First argument is module name, rest are parameters */
|
|
DBG("probing just module %s", *argv);
|
|
add_probe(argv[0]);
|
|
G.cmdline_mopts = parse_cmdline_module_options(argv);
|
|
}
|
|
|
|
/* Happens if all requested modules are already loaded */
|
|
if (G.probes == NULL)
|
|
return EXIT_SUCCESS;
|
|
|
|
read_config("/etc/modprobe.conf");
|
|
read_config("/etc/modprobe.d");
|
|
if (ENABLE_FEATURE_MODUTILS_SYMBOLS && G.need_symbols)
|
|
read_config("modules.symbols");
|
|
load_modules_dep();
|
|
if (ENABLE_FEATURE_MODUTILS_ALIAS && G.num_unresolved_deps) {
|
|
read_config("modules.alias");
|
|
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);
|
|
}
|
|
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 (rc != 0);
|
|
}
|