busybox/modutils/modprobe-small.c
Denys Vlasenko 205d48e948 *: add comment about APPLET_ODDNAME format
It confused me more than once

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-29 14:57:33 +01:00

1074 lines
30 KiB
C

/* vi: set sw=4 ts=4: */
/*
* simplified modprobe
*
* Copyright (c) 2008 Vladimir Dronnikov
* Copyright (c) 2008 Bernhard Reutner-Fischer (initial depmod code)
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
/* config MODPROBE_SMALL is defined in Config.src to ensure better "make config" order */
//config:config FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
//config: bool "Accept module options on modprobe command line"
//config: default y
//config: depends on MODPROBE_SMALL && (INSMOD || MODPROBE)
//config: help
//config: Allow insmod and modprobe take module options from command line.
//config:
//config:config FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
//config: bool "Skip loading of already loaded modules"
//config: default y
//config: depends on MODPROBE_SMALL && (DEPMOD || INSMOD || MODPROBE)
//config: help
//config: Check if the module is already loaded.
//applet:IF_MODPROBE(IF_MODPROBE_SMALL(APPLET(modprobe, BB_DIR_SBIN, BB_SUID_DROP)))
// APPLET_ODDNAME:name main location suid_type help
//applet:IF_DEPMOD(IF_MODPROBE_SMALL(APPLET_ODDNAME(depmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, depmod)))
//applet:IF_INSMOD(IF_MODPROBE_SMALL(APPLET_ODDNAME(insmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, insmod)))
//applet:IF_LSMOD(IF_MODPROBE_SMALL( APPLET_ODDNAME(lsmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, lsmod)))
//applet:IF_RMMOD(IF_MODPROBE_SMALL( APPLET_ODDNAME(rmmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, rmmod)))
//kbuild:lib-$(CONFIG_MODPROBE_SMALL) += modprobe-small.o
#include "libbb.h"
/* After libbb.h, since it needs sys/types.h on some systems */
#include <sys/utsname.h> /* uname() */
#include <fnmatch.h>
#include <sys/syscall.h>
#define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts)
#define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags)
#ifdef __NR_finit_module
# define finit_module(fd, uargs, flags) syscall(__NR_finit_module, fd, uargs, flags)
#endif
/* linux/include/linux/module.h has limit of 64 chars on module names */
#undef MODULE_NAME_LEN
#define MODULE_NAME_LEN 64
#if 1
# define dbg1_error_msg(...) ((void)0)
# define dbg2_error_msg(...) ((void)0)
#else
# define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
# define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
#endif
#define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb"
#define MOD_APPLET_CNT (ENABLE_MODPROBE + ENABLE_DEPMOD + ENABLE_INSMOD + ENABLE_LSMOD + ENABLE_RMMOD)
/* Do not bother if MODPROBE_SMALL=y but no applets selected. */
/* The rest of the file is in this if block. */
#if MOD_APPLET_CNT > 0
#define ONLY_APPLET (MOD_APPLET_CNT == 1)
#define is_modprobe (ENABLE_MODPROBE && (ONLY_APPLET || applet_name[0] == 'm'))
#define is_depmod (ENABLE_DEPMOD && (ONLY_APPLET || applet_name[0] == 'd'))
#define is_insmod (ENABLE_INSMOD && (ONLY_APPLET || applet_name[0] == 'i'))
#define is_lsmod (ENABLE_LSMOD && (ONLY_APPLET || applet_name[0] == 'l'))
#define is_rmmod (ENABLE_RMMOD && (ONLY_APPLET || applet_name[0] == 'r'))
enum {
OPT_q = (1 << 0), /* be quiet */
OPT_r = (1 << 1), /* module removal instead of loading */
};
typedef struct module_info {
char *pathname;
char *aliases;
char *deps;
smallint open_read_failed;
} module_info;
/*
* GLOBALS
*/
struct globals {
module_info *modinfo;
char *module_load_options;
smallint dep_bb_seen;
smallint wrote_dep_bb_ok;
unsigned module_count;
int module_found_idx;
unsigned stringbuf_idx;
unsigned stringbuf_size;
char *stringbuf; /* some modules have lots of stuff */
/* for example, drivers/media/video/saa7134/saa7134.ko */
/* therefore having a fixed biggish buffer is not wise */
};
#define G (*ptr_to_globals)
#define modinfo (G.modinfo )
#define dep_bb_seen (G.dep_bb_seen )
#define wrote_dep_bb_ok (G.wrote_dep_bb_ok )
#define module_count (G.module_count )
#define module_found_idx (G.module_found_idx )
#define module_load_options (G.module_load_options)
#define stringbuf_idx (G.stringbuf_idx )
#define stringbuf_size (G.stringbuf_size )
#define stringbuf (G.stringbuf )
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)
static void append(const char *s)
{
unsigned len = strlen(s);
if (stringbuf_idx + len + 15 > stringbuf_size) {
stringbuf_size = stringbuf_idx + len + 127;
dbg2_error_msg("grow stringbuf to %u", stringbuf_size);
stringbuf = xrealloc(stringbuf, stringbuf_size);
}
memcpy(stringbuf + stringbuf_idx, s, len);
stringbuf_idx += len;
}
static void appendc(char c)
{
/* We appendc() only after append(), + 15 trick in append()
* makes it unnecessary to check for overflow here */
stringbuf[stringbuf_idx++] = c;
}
static void bksp(void)
{
if (stringbuf_idx)
stringbuf_idx--;
}
static void reset_stringbuf(void)
{
stringbuf_idx = 0;
}
static char* copy_stringbuf(void)
{
char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */
return memcpy(copy, stringbuf, stringbuf_idx);
}
static char* find_keyword(char *ptr, size_t len, const char *word)
{
if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */
return NULL;
len -= strlen(word) - 1;
while ((ssize_t)len > 0) {
char *old = ptr;
char *after_word;
/* search for the first char in word */
ptr = memchr(ptr, word[0], len);
if (ptr == NULL) /* no occurance left, done */
break;
after_word = is_prefixed_with(ptr, word);
if (after_word)
return after_word; /* found, return ptr past it */
++ptr;
len -= (ptr - old);
}
return NULL;
}
static void replace(char *s, char what, char with)
{
while (*s) {
if (what == *s)
*s = with;
++s;
}
}
static char *filename2modname(const char *filename, char *modname)
{
int i;
const char *from;
// Disabled since otherwise "modprobe dir/name" would work
// as if it is "modprobe name". It is unclear why
// 'basenamization' was here in the first place.
//from = bb_get_last_path_component_nostrip(filename);
from = filename;
for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++)
modname[i] = (from[i] == '-') ? '_' : from[i];
modname[i] = '\0';
return modname;
}
static int pathname_matches_modname(const char *pathname, const char *modname)
{
int r;
char name[MODULE_NAME_LEN];
filename2modname(bb_get_last_path_component_nostrip(pathname), name);
r = (strcmp(name, modname) == 0);
return r;
}
/* Take "word word", return malloced "word",NUL,"word",NUL,NUL */
static char* str_2_list(const char *str)
{
int len = strlen(str) + 1;
char *dst = xmalloc(len + 1);
dst[len] = '\0';
memcpy(dst, str, len);
//TODO: protect against 2+ spaces: "word word"
replace(dst, ' ', '\0');
return dst;
}
/* We use error numbers in a loose translation... */
static const char *moderror(int err)
{
switch (err) {
case ENOEXEC:
return "invalid module format";
case ENOENT:
return "unknown symbol in module or invalid parameter";
case ESRCH:
return "module has wrong symbol version";
case EINVAL: /* "invalid parameter" */
return "unknown symbol in module or invalid parameter"
+ sizeof("unknown symbol in module or");
default:
return strerror(err);
}
}
static int load_module(const char *fname, const char *options)
{
#if 1
int r;
size_t len = MAXINT(ssize_t);
char *module_image;
if (!options)
options = "";
dbg1_error_msg("load_module('%s','%s')", fname, options);
/*
* First we try finit_module if available. Some kernels are configured
* to only allow loading of modules off of secure storage (like a read-
* only rootfs) which needs the finit_module call. If it fails, we fall
* back to normal module loading to support compressed modules.
*/
r = 1;
# ifdef __NR_finit_module
{
int fd = open(fname, O_RDONLY | O_CLOEXEC);
if (fd >= 0) {
r = finit_module(fd, options, 0) != 0;
close(fd);
}
}
# endif
if (r != 0) {
module_image = xmalloc_open_zipped_read_close(fname, &len);
r = (!module_image || init_module(module_image, len, options) != 0);
free(module_image);
}
dbg1_error_msg("load_module:%d", r);
return r; /* 0 = success */
#else
/* For testing */
dbg1_error_msg("load_module('%s','%s')", fname, options);
return 1;
#endif
}
/* Returns !0 if open/read was unsuccessful */
static int parse_module(module_info *info, const char *pathname)
{
char *module_image;
char *ptr;
size_t len;
size_t pos;
dbg1_error_msg("parse_module('%s')", pathname);
/* Read (possibly compressed) module */
errno = 0;
len = 64 * 1024 * 1024; /* 64 Mb at most */
module_image = xmalloc_open_zipped_read_close(pathname, &len);
/* module_image == NULL is ok here, find_keyword handles it */
//TODO: optimize redundant module body reads
/* "alias1 symbol:sym1 alias2 symbol:sym2" */
reset_stringbuf();
pos = 0;
while (1) {
unsigned start = stringbuf_idx;
ptr = find_keyword(module_image + pos, len - pos, "alias=");
if (!ptr) {
ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
if (!ptr)
break;
/* DOCME: __ksymtab_gpl and __ksymtab_strings occur
* in many modules. What do they mean? */
if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0)
goto skip;
dbg2_error_msg("alias:'symbol:%s'", ptr);
append("symbol:");
} else {
dbg2_error_msg("alias:'%s'", ptr);
}
append(ptr);
appendc(' ');
/*
* Don't add redundant aliases, such as:
* libcrc32c.ko symbol:crc32c symbol:crc32c
*/
if (start) { /* "if we aren't the first alias" */
char *found, *last;
stringbuf[stringbuf_idx] = '\0';
last = stringbuf + start;
/*
* String at last-1 is " symbol:crc32c "
* (with both leading and trailing spaces).
*/
if (strncmp(stringbuf, last, stringbuf_idx - start) == 0)
/* First alias matches us */
found = stringbuf;
else
/* Does any other alias match? */
found = strstr(stringbuf, last-1);
if (found < last-1) {
/* There is absolutely the same string before us */
dbg2_error_msg("redundant:'%s'", last);
stringbuf_idx = start;
goto skip;
}
}
skip:
pos = (ptr - module_image);
}
bksp(); /* remove last ' ' */
info->aliases = copy_stringbuf();
replace(info->aliases, '-', '_');
/* "dependency1 depandency2" */
reset_stringbuf();
ptr = find_keyword(module_image, len, "depends=");
if (ptr && *ptr) {
replace(ptr, ',', ' ');
replace(ptr, '-', '_');
dbg2_error_msg("dep:'%s'", ptr);
append(ptr);
}
free(module_image);
info->deps = copy_stringbuf();
info->open_read_failed = (module_image == NULL);
return info->open_read_failed;
}
static FAST_FUNC int fileAction(const char *pathname,
struct stat *sb UNUSED_PARAM,
void *modname_to_match,
int depth UNUSED_PARAM)
{
int cur;
const char *fname;
bool is_remove = (ENABLE_RMMOD && ONLY_APPLET)
|| ((ENABLE_RMMOD || ENABLE_MODPROBE) && (option_mask32 & OPT_r));
pathname += 2; /* skip "./" */
fname = bb_get_last_path_component_nostrip(pathname);
if (!strrstr(fname, ".ko")) {
dbg1_error_msg("'%s' is not a module", pathname);
return TRUE; /* not a module, continue search */
}
cur = module_count++;
modinfo = xrealloc_vector(modinfo, 12, cur);
modinfo[cur].pathname = xstrdup(pathname);
/*modinfo[cur].aliases = NULL; - xrealloc_vector did it */
/*modinfo[cur+1].pathname = NULL;*/
if (!pathname_matches_modname(fname, modname_to_match)) {
dbg1_error_msg("'%s' module name doesn't match", pathname);
return TRUE; /* module name doesn't match, continue search */
}
dbg1_error_msg("'%s' module name matches", pathname);
module_found_idx = cur;
if (parse_module(&modinfo[cur], pathname) != 0)
return TRUE; /* failed to open/read it, no point in trying loading */
if (!is_remove) {
if (load_module(pathname, module_load_options) == 0) {
/* Load was successful, there is nothing else to do.
* This can happen ONLY for "top-level" module load,
* not a dep, because deps dont do dirscan. */
exit(EXIT_SUCCESS);
}
}
return TRUE;
}
static int load_dep_bb(void)
{
char *line;
FILE *fp = fopen_for_read(DEPFILE_BB);
if (!fp)
return 0;
dep_bb_seen = 1;
dbg1_error_msg("loading "DEPFILE_BB);
/* Why? There is a rare scenario: we did not find modprobe.dep.bb,
* we scanned the dir and found no module by name, then we search
* for alias (full scan), and we decided to generate modprobe.dep.bb.
* But we see modprobe.dep.bb.new! Other modprobe is at work!
* We wait and other modprobe renames it to modprobe.dep.bb.
* Now we can use it.
* But we already have modinfo[] filled, and "module_count = 0"
* makes us start anew. Yes, we leak modinfo[].xxx pointers -
* there is not much of data there anyway. */
module_count = 0;
memset(&modinfo[0], 0, sizeof(modinfo[0]));
while ((line = xmalloc_fgetline(fp)) != NULL) {
char* space;
char* linebuf;
int cur;
if (!line[0]) {
free(line);
continue;
}
space = strchrnul(line, ' ');
cur = module_count++;
modinfo = xrealloc_vector(modinfo, 12, cur);
/*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */
modinfo[cur].pathname = line; /* we take ownership of malloced block here */
if (*space)
*space++ = '\0';
modinfo[cur].aliases = space;
linebuf = xmalloc_fgetline(fp);
modinfo[cur].deps = linebuf ? linebuf : xzalloc(1);
if (modinfo[cur].deps[0]) {
/* deps are not "", so next line must be empty */
line = xmalloc_fgetline(fp);
/* Refuse to work with damaged config file */
if (line && line[0])
bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line);
free(line);
}
}
return 1;
}
static int start_dep_bb_writeout(void)
{
int fd;
/* depmod -n: write result to stdout */
if (applet_name[0] == 'd' && (option_mask32 & 1))
return STDOUT_FILENO;
fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644);
if (fd < 0) {
if (errno == EEXIST) {
int count = 5 * 20;
dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB);
while (1) {
usleep(1000*1000 / 20);
if (load_dep_bb()) {
dbg1_error_msg(DEPFILE_BB" appeared");
return -2; /* magic number */
}
if (!--count)
break;
}
bb_error_msg("deleting stale %s", DEPFILE_BB".new");
fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC);
}
}
dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd);
return fd;
}
static void write_out_dep_bb(int fd)
{
int i;
FILE *fp;
/* We want good error reporting. fdprintf is not good enough. */
fp = xfdopen_for_write(fd);
i = 0;
while (modinfo[i].pathname) {
fprintf(fp, "%s%s%s\n" "%s%s\n",
modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases,
modinfo[i].deps, modinfo[i].deps[0] ? "\n" : "");
i++;
}
/* Badly formatted depfile is a no-no. Be paranoid. */
errno = 0;
if (ferror(fp) | fclose(fp)) /* | instead of || is intended */
goto err;
if (fd == STDOUT_FILENO) /* it was depmod -n */
goto ok;
if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) {
err:
bb_perror_msg("can't create '%s'", DEPFILE_BB);
unlink(DEPFILE_BB".new");
} else {
ok:
wrote_dep_bb_ok = 1;
dbg1_error_msg("created "DEPFILE_BB);
}
}
static module_info** find_alias(const char *alias)
{
int i;
int dep_bb_fd;
int infoidx;
module_info **infovec;
dbg1_error_msg("find_alias('%s')", alias);
try_again:
/* First try to find by name (cheaper) */
i = 0;
while (modinfo[i].pathname) {
if (pathname_matches_modname(modinfo[i].pathname, alias)) {
dbg1_error_msg("found '%s' in module '%s'",
alias, modinfo[i].pathname);
if (!modinfo[i].aliases) {
parse_module(&modinfo[i], modinfo[i].pathname);
}
infovec = xzalloc(2 * sizeof(infovec[0]));
infovec[0] = &modinfo[i];
return infovec;
}
i++;
}
/* Ok, we definitely have to scan module bodies. This is a good
* moment to generate modprobe.dep.bb, if it does not exist yet */
dep_bb_fd = dep_bb_seen ? -1 : start_dep_bb_writeout();
if (dep_bb_fd == -2) /* modprobe.dep.bb appeared? */
goto try_again;
/* Scan all module bodies, extract modinfo (it contains aliases) */
i = 0;
infoidx = 0;
infovec = NULL;
while (modinfo[i].pathname) {
char *desc, *s;
if (!modinfo[i].aliases) {
parse_module(&modinfo[i], modinfo[i].pathname);
}
/* "alias1 symbol:sym1 alias2 symbol:sym2" */
desc = str_2_list(modinfo[i].aliases);
/* Does matching substring exist? */
for (s = desc; *s; s += strlen(s) + 1) {
/* Aliases in module bodies can be defined with
* shell patterns. Example:
* "pci:v000010DEd000000D9sv*sd*bc*sc*i*".
* Plain strcmp() won't catch that */
if (fnmatch(s, alias, 0) == 0) {
dbg1_error_msg("found alias '%s' in module '%s'",
alias, modinfo[i].pathname);
infovec = xrealloc_vector(infovec, 1, infoidx);
infovec[infoidx++] = &modinfo[i];
break;
}
}
free(desc);
i++;
}
/* Create module.dep.bb if needed */
if (dep_bb_fd >= 0) {
write_out_dep_bb(dep_bb_fd);
}
dbg1_error_msg("find_alias '%s' returns %d results", alias, infoidx);
return infovec;
}
#if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
// TODO: open only once, invent config_rewind()
static int already_loaded(const char *name)
{
int ret;
char *line;
FILE *fp;
ret = 5 * 2;
again:
fp = fopen_for_read("/proc/modules");
if (!fp)
return 0;
while ((line = xmalloc_fgetline(fp)) != NULL) {
char *live;
char *after_name;
// Examples from kernel 3.14.6:
//pcspkr 12718 0 - Live 0xffffffffa017e000
//snd_timer 28690 2 snd_seq,snd_pcm, Live 0xffffffffa025e000
//i915 801405 2 - Live 0xffffffffa0096000
after_name = is_prefixed_with(line, name);
if (!after_name || *after_name != ' ') {
free(line);
continue;
}
live = strstr(line, " Live");
free(line);
if (!live) {
/* State can be Unloading, Loading, or Live.
* modprobe must not return prematurely if we see "Loading":
* it can cause further programs to assume load completed,
* but it did not (yet)!
* Wait up to 5*20 ms for it to resolve.
*/
ret -= 2;
if (ret == 0)
break; /* huh? report as "not loaded" */
fclose(fp);
usleep(20*1000);
goto again;
}
ret = 1;
break;
}
fclose(fp);
return ret & 1;
}
#else
#define already_loaded(name) 0
#endif
static int rmmod(const char *filename)
{
int r;
char modname[MODULE_NAME_LEN];
filename2modname(filename, modname);
r = delete_module(modname, O_NONBLOCK | O_EXCL);
dbg1_error_msg("delete_module('%s', O_NONBLOCK | O_EXCL):%d", modname, r);
if (r != 0 && !(option_mask32 & OPT_q)) {
bb_perror_msg("remove '%s'", modname);
}
return r;
}
/*
* Given modules definition and module name (or alias, or symbol)
* load/remove the module respecting dependencies.
* NB: also called by depmod with bogus name "/",
* just in order to force modprobe.dep.bb creation.
*/
#if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
#define process_module(a,b) process_module(a)
#define cmdline_options ""
#endif
static int process_module(char *name, const char *cmdline_options)
{
char *s, *deps, *options;
module_info **infovec;
module_info *info;
int infoidx;
bool is_remove = (ENABLE_RMMOD && ONLY_APPLET)
|| ((ENABLE_RMMOD || ENABLE_MODPROBE) && (option_mask32 & OPT_r));
int exitcode = EXIT_SUCCESS;
dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
replace(name, '-', '_');
dbg1_error_msg("already_loaded:%d is_remove:%d", already_loaded(name), is_remove);
if (is_rmmod) {
/* Does not remove dependencies, no need to scan, just remove.
* (compat note: this allows and strips .ko suffix)
*/
rmmod(name);
return EXIT_SUCCESS;
}
/*
* We used to have "is_remove != already_loaded(name)" check here, but
* modprobe -r pci:v00008086d00007010sv00000000sd00000000bc01sc01i80
* won't unload modules (there are more than one)
* which have this alias.
*/
if (!is_remove && already_loaded(name)) {
dbg1_error_msg("nothing to do for '%s'", name);
return EXIT_SUCCESS;
}
options = NULL;
if (!is_remove) {
char *opt_filename = xasprintf("/etc/modules/%s", name);
options = xmalloc_open_read_close(opt_filename, NULL);
if (options)
replace(options, '\n', ' ');
#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
if (cmdline_options) {
/* NB: cmdline_options always have one leading ' '
* (see main()), we remove it here */
char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
cmdline_options + 1, options);
free(options);
options = op;
}
#endif
free(opt_filename);
module_load_options = options;
dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
}
if (!module_count) {
/* Scan module directory. This is done only once.
* It will attempt module load, and will exit(EXIT_SUCCESS)
* on success.
*/
module_found_idx = -1;
recursive_action(".",
ACTION_RECURSE, /* flags */
fileAction, /* file action */
NULL, /* dir action */
name, /* user data */
0 /* depth */
);
dbg1_error_msg("dirscan complete");
/* Module was not found, or load failed, or is_remove */
if (module_found_idx >= 0) { /* module was found */
infovec = xzalloc(2 * sizeof(infovec[0]));
infovec[0] = &modinfo[module_found_idx];
} else { /* search for alias, not a plain module name */
infovec = find_alias(name);
}
} else {
infovec = find_alias(name);
}
if (!infovec) {
/* both dirscan and find_alias found nothing */
if (!is_remove && !is_depmod) /* it wasn't rmmod or depmod */
bb_error_msg("module '%s' not found", name);
//TODO: _and_die()? or should we continue (un)loading modules listed on cmdline?
goto ret;
}
/* There can be more than one module for the given alias. For example,
* "pci:v00008086d00007010sv00000000sd00000000bc01sc01i80" matches
* ata_piix because it has alias "pci:v00008086d00007010sv*sd*bc*sc*i*"
* and ata_generic, it has alias "pci:v*d*sv*sd*bc01sc01i*"
* Standard modprobe loads them both. We achieve it by returning
* a *list* of modinfo pointers from find_alias().
*/
/* modprobe -r? unload module(s) */
if (is_remove) {
infoidx = 0;
while ((info = infovec[infoidx++]) != NULL) {
int r = rmmod(bb_get_last_path_component_nostrip(info->pathname));
if (r != 0) {
goto ret; /* error */
}
}
/* modprobe -r: we do not stop here -
* continue to unload modules on which the module depends:
* "-r --remove: option causes modprobe to remove a module.
* If the modules it depends on are also unused, modprobe
* will try to remove them, too."
*/
}
infoidx = 0;
while ((info = infovec[infoidx++]) != NULL) {
/* Iterate thru dependencies, trying to (un)load them */
deps = str_2_list(info->deps);
for (s = deps; *s; s += strlen(s) + 1) {
//if (strcmp(name, s) != 0) // N.B. do loops exist?
dbg1_error_msg("recurse on dep '%s'", s);
process_module(s, NULL);
dbg1_error_msg("recurse on dep '%s' done", s);
}
free(deps);
if (is_remove)
continue;
/* We are modprobe: load it */
if (options && strstr(options, "blacklist")) {
dbg1_error_msg("'%s': blacklisted", info->pathname);
continue;
}
if (info->open_read_failed) {
/* We already tried it, didn't work. Don't try load again */
exitcode = EXIT_FAILURE;
continue;
}
errno = 0;
if (load_module(info->pathname, options) != 0) {
if (EEXIST != errno) {
bb_error_msg("'%s': %s",
info->pathname,
moderror(errno));
} else {
dbg1_error_msg("'%s': %s",
info->pathname,
moderror(errno));
}
exitcode = EXIT_FAILURE;
}
}
ret:
free(infovec);
free(options);
return exitcode;
}
#undef cmdline_options
/* For reference, module-init-tools v3.4 options:
# insmod
Usage: insmod filename [args]
# rmmod --help
Usage: rmmod [-fhswvV] modulename ...
-f (or --force) forces a module unload, and may crash your
machine. This requires the Forced Module Removal option
when the kernel was compiled.
-h (or --help) prints this help text
-s (or --syslog) says use syslog, not stderr
-v (or --verbose) enables more messages
-V (or --version) prints the version code
-w (or --wait) begins module removal even if it is used
and will stop new users from accessing the module (so it
should eventually fall to zero).
# modprobe
Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b]
[-o <modname>] [ --dump-modversions ] <modname> [parameters...]
modprobe -r [-n] [-i] [-v] <modulename> ...
modprobe -l -t <dirname> [ -a <modulename> ...]
# depmod --help
depmod 3.4 -- part of module-init-tools
depmod -[aA] [-n -e -v -q -V -r -u]
[-b basedirectory] [forced_version]
depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ...
If no arguments (except options) are given, "depmod -a" is assumed.
depmod will output a dependency list suitable for the modprobe utility.
Options:
-a, --all Probe all modules
-A, --quick Only does the work if there's a new module
-n, --show Write the dependency file on stdout only
-e, --errsyms Report not supplied symbols
-V, --version Print the release version
-v, --verbose Enable verbose mode
-h, --help Print this usage message
The following options are useful for people managing distributions:
-b basedirectory
--basedir basedirectory
Use an image of a module tree
-F kernelsyms
--filesyms kernelsyms
Use the file instead of the current kernel symbols
*/
//usage:#if ENABLE_MODPROBE_SMALL
//usage:#define depmod_trivial_usage NOUSAGE_STR
//usage:#define depmod_full_usage ""
//usage:#define lsmod_trivial_usage
//usage: ""
//usage:#define lsmod_full_usage "\n\n"
//usage: "List the currently loaded kernel modules"
//usage:#define insmod_trivial_usage
//usage: IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ")
//usage: IF_NOT_FEATURE_2_4_MODULES("FILE ")
//usage: "[SYMBOL=VALUE]..."
//usage:#define insmod_full_usage "\n\n"
//usage: "Load kernel module"
//usage: IF_FEATURE_2_4_MODULES( "\n"
//usage: "\n -f Force module to load into the wrong kernel version"
//usage: "\n -k Make module autoclean-able"
//usage: "\n -v Verbose"
//usage: "\n -q Quiet"
//usage: "\n -L Lock: prevent simultaneous loads"
//usage: IF_FEATURE_INSMOD_LOAD_MAP(
//usage: "\n -m Output load map to stdout"
//usage: )
//usage: "\n -x Don't export externs"
//usage: )
//usage:#define rmmod_trivial_usage
//usage: "[-wfa] [MODULE]..."
//usage:#define rmmod_full_usage "\n\n"
//usage: "Unload kernel modules\n"
//usage: "\n -w Wait until the module is no longer used"
//usage: "\n -f Force unload"
//usage: "\n -a Remove all unused modules (recursively)"
//usage:
//usage:#define rmmod_example_usage
//usage: "$ rmmod tulip\n"
//usage:#define modprobe_trivial_usage
//usage: "[-qfwrsv] MODULE [SYMBOL=VALUE]..."
//usage:#define modprobe_full_usage "\n\n"
//usage: " -r Remove MODULE (stacks) or do autoclean"
//usage: "\n -q Quiet"
//usage: "\n -v Verbose"
//usage: "\n -f Force"
//usage: "\n -w Wait for unload"
//usage: "\n -s Report via syslog instead of stderr"
//usage:#endif
int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int modprobe_main(int argc UNUSED_PARAM, char **argv)
{
#if ENABLE_MODPROBE || ENABLE_INSMOD || ENABLE_RMMOD
int exitcode;
#endif
struct utsname uts;
IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options = NULL;)
/* are we lsmod? -> just dump /proc/modules */
if (is_lsmod) {
xprint_and_close_file(xfopen_for_read("/proc/modules"));
return EXIT_SUCCESS;
}
INIT_G();
/* Prevent ugly corner cases with no modules at all */
modinfo = xzalloc(sizeof(modinfo[0]));
if (!is_insmod) {
/* Goto modules directory */
xchdir(CONFIG_DEFAULT_MODULES_DIR);
}
uname(&uts); /* never fails */
/* depmod? */
if ((MOD_APPLET_CNT == 2 && ENABLE_DEPMOD && ENABLE_LSMOD)
/* ^^^^only depmod and lsmod is configured^^^^^^^^^^^^^^^ */
/* note: we already know here it is not lsmod (handled before) */
|| is_depmod
) {
/* Supported:
* -n: print result to stdout
* -a: process all modules (default)
* optional VERSION parameter
* Ignored:
* -A: do work only if a module is newer than depfile
* -e: report any symbols which a module needs
* which are not supplied by other modules or the kernel
* -F FILE: System.map (symbols for -e)
* -q, -r, -u: noop?
* Not supported:
* -b BASEDIR: (TODO!) modules are in
* $BASEDIR/lib/modules/$VERSION
* -v: human readable deps to stdout
* -V: version (don't want to support it - people may depend
* on it as an indicator of "standard" depmod)
* -h: help (well duh)
* module1.o module2.o parameters (just ignored for now)
*/
getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL);
argv += optind;
/* if (argv[0] && argv[1]) bb_show_usage(); */
/* Goto $VERSION directory */
xchdir(argv[0] ? argv[0] : uts.release);
/* Force full module scan by asking to find a bogus module.
* This will generate modules.dep.bb as a side effect. */
process_module((char*)"/", NULL);
return !wrote_dep_bb_ok;
}
#if ENABLE_MODPROBE || ENABLE_INSMOD || ENABLE_RMMOD
/* modprobe, insmod, rmmod require at least one argument */
opt_complementary = "-1";
/* only -q (quiet) and -r (rmmod),
* the rest are accepted and ignored (compat) */
getopt32(argv, "qrfsvwb");
argv += optind;
if (!is_insmod) {
/* Goto $VERSION directory */
xchdir(uts.release);
}
/* are we rmmod? -> simulate modprobe -r, but don't bother the flag if
* there're no other applets here */
if (is_rmmod) {
if (!ONLY_APPLET)
option_mask32 |= OPT_r;
} else if (!ENABLE_MODPROBE || !(option_mask32 & OPT_r)) {
# if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
/* If not rmmod/-r, parse possible module options given on command line.
* insmod/modprobe takes one module name, the rest are parameters. */
char **arg = argv;
while (*++arg) {
/* Enclose options in quotes */
char *s = options;
options = xasprintf("%s \"%s\"", s ? s : "", *arg);
free(s);
*arg = NULL;
}
# else
argv[1] = NULL;
# endif
}
if (is_insmod) {
size_t len;
void *map;
len = MAXINT(ssize_t);
map = xmalloc_open_zipped_read_close(*argv, &len);
if (!map)
bb_perror_msg_and_die("can't read '%s'", *argv);
if (init_module(map, len,
(IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : ) "")
) != 0
) {
bb_error_msg_and_die("can't insert '%s': %s",
*argv, moderror(errno));
}
return EXIT_SUCCESS;
}
/* Try to load modprobe.dep.bb */
if (!is_rmmod) {
load_dep_bb();
}
/* Load/remove modules.
* Only rmmod/modprobe -r loops here, insmod/modprobe has only argv[0] */
exitcode = EXIT_SUCCESS;
do {
exitcode |= process_module(*argv, options);
} while (*++argv);
if (ENABLE_FEATURE_CLEAN_UP) {
IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)
}
return exitcode;
#endif /* MODPROBE || INSMOD || RMMOD */
}
#endif /* MOD_APPLET_CNT > 0 */