busybox/modutils/depmod.c

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/* vi: set sw=4 ts=4: */
/*
* depmod - generate modules.dep
* Copyright (c) 2008 Bernhard Fischer
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#undef _GNU_SOURCE
#define _GNU_SOURCE
#include <libbb.h>
#include <sys/utsname.h> /* uname() */
/*
* Theory of operation:
* - iterate over all modules and record their full path
* - iterate over all modules looking for "depends=" entries
* for each depends, look through our list of full paths and emit if found
*/
typedef struct dep_lst_t {
char *name;
llist_t *dependencies;
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llist_t *aliases;
struct dep_lst_t *next;
} dep_lst_t;
struct globals {
dep_lst_t *lst; /* modules without their corresponding extension */
};
#define G (*(struct globals*)&bb_common_bufsiz1)
/* We have to zero it out because of NOEXEC */
#define INIT_G() memset(&G, 0, sizeof(G))
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static char* find_keyword(void *the_module, size_t len, const char * const word)
{
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char *ptr = the_module;
do {
/* search for the first char in word */
ptr = memchr(ptr, *word, len - (ptr - (char*)the_module));
if (ptr == NULL) /* no occurance left, done */
return NULL;
if (!strncmp(ptr, word, strlen(word))) {
ptr += strlen(word);
break;
}
++ptr;
} while (1);
return ptr;
}
static int fileAction(const char *fname, struct stat *sb,
void ATTRIBUTE_UNUSED *data, int ATTRIBUTE_UNUSED depth)
{
size_t len = sb->st_size;
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void *the_module;
char *ptr;
int fd;
char *depends, *deps;
dep_lst_t *this;
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if (strrstr(fname, ".ko") == NULL) /* not a module */
goto skip;
/*XXX: FIXME: does not handle compressed modules!
* There should be a function that looks at the extension and sets up
* open_transformer for us.
*/
fd = xopen(fname, O_RDONLY);
the_module = mmap(NULL, len, PROT_READ, MAP_SHARED
#if defined MAP_POPULATE
|MAP_POPULATE
#endif
, fd, 0);
close(fd);
if (the_module == MAP_FAILED)
bb_perror_msg_and_die("mmap");
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this = xzalloc(sizeof(dep_lst_t));
this->name = xstrdup(fname);
this->next = G.lst;
G.lst = this;
//bb_info_msg("fname='%s'", fname);
ptr = find_keyword(the_module, len, "depends=");
if (!*ptr)
goto d_none;
deps = depends = xstrdup(ptr);
//bb_info_msg(" depends='%s'", depends);
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while (deps) {
ptr = strsep(&deps, ",");
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//bb_info_msg("[%s] -> '%s'", fname, (char*)ptr);
llist_add_to_end(&this->dependencies, xstrdup(ptr));
}
free(depends);
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d_none:
if (ENABLE_FEATURE_DEPMOD_ALIAS)
{
size_t pos = 0;
do {
ptr = find_keyword(the_module + pos, len - pos, "alias=");
if (ptr) {
//bb_info_msg("[%s] alias '%s'", fname, (char*)ptr);
llist_add_to_end(&this->aliases, xstrdup(ptr));
} else
break;
pos = (ptr - (char*)the_module);
} while (1);
}
munmap(the_module, sb->st_size);
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skip:
return TRUE;
}
int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int depmod_main(int ATTRIBUTE_UNUSED argc, char **argv)
{
int ret;
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size_t moddir_base_len = 0; /* length of the "-b basedir" */
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char *moddir_base = NULL, *moddir, *system_map, *chp;
FILE *filedes = stdout;
enum {
ARG_a = (1<<0), /* All modules, ignore mods in argv */
ARG_A = (1<<1), /* Only emit .ko that are newer than modules.dep file */
ARG_b = (1<<2), /* not /lib/modules/$(uname -r)/ but this base-dir */
ARG_e = (1<<3), /* with -F, print unresolved symbols */
ARG_F = (1<<4), /* System.map that contains the symbols */
ARG_n = (1<<5) /* dry-run, print to stdout only */
};
INIT_G();
getopt32(argv, "aAb:eF:n", &moddir_base, &system_map);
argv += optind;
/* If a version is provided, then that kernel versions module directory
* is used, rather than the current kernel version (as returned by
* "uname -r"). */
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if (*argv && (sscanf(*argv, "%d.%d.%d", &ret, &ret, &ret) == 3)) {
moddir = concat_path_file(CONFIG_DEFAULT_MODULES_DIR, *argv++);
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} else {
struct utsname uts;
if (uname(&uts) < 0)
bb_simple_perror_msg_and_die("uname");
moddir = concat_path_file(CONFIG_DEFAULT_MODULES_DIR, uts.release);
}
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/* If no modules are given on the command-line, -a is on per default. */
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option_mask32 |= *argv == NULL;
if (option_mask32 & ARG_b) {
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moddir_base_len = strlen(moddir_base) + 1;
xchdir(moddir_base);
}
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if (!(option_mask32 & ARG_n)) { /* --dry-run */
chp = concat_path_file(moddir, CONFIG_DEFAULT_DEPMOD_FILE);
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filedes = xfopen(chp, "w");
if (ENABLE_FEATURE_CLEAN_UP)
free(chp);
}
ret = EXIT_SUCCESS;
do {
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chp = option_mask32 & ARG_a ? moddir : (*argv + moddir_base_len);
if (!recursive_action(chp,
ACTION_RECURSE, /* flags */
fileAction, /* file action */
NULL, /* dir action */
NULL, /* user data */
0)) { /* depth */
ret = EXIT_FAILURE;
}
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} while (!(option_mask32 & ARG_a) && *++argv);
{
dep_lst_t *mods = G.lst;
/* Fixup the module names in the depends list */
while (mods) {
llist_t *deps = NULL, *old_deps = mods->dependencies;
while (old_deps) {
dep_lst_t *all = G.lst;
char *longname = NULL;
char *shortname = llist_pop(&old_deps);
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while (all) {
char *nam =
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xstrdup(bb_get_last_path_component_nostrip(all->name));
char *tmp = strrstr(nam, ".ko");
*tmp = '\0';
if (!strcmp(nam, shortname)) {
if (ENABLE_FEATURE_CLEAN_UP)
free(nam);
longname = all->name;
break;
}
free(nam);
all = all->next;
}
llist_add_to_end(&deps, longname);
}
mods->dependencies = deps;
mods = mods->next;
}
#if ENABLE_FEATURE_DEPMOD_PRUNE_FANCY
/* modprobe allegedly wants dependencies without duplicates, i.e.
* mod1: mod2 mod3
* mod2: mod3
* mod3:
* implies that mod1 directly depends on mod2 and _not_ mod3 as mod3 is
* already implicitely pulled in via mod2. This leaves us with:
* mod1: mod2
* mod2: mod3
* mod3:
*/
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mods = G.lst;
while (mods) {
llist_t *deps = mods->dependencies;
while (deps) {
dep_lst_t *all = G.lst;
while (all) {
if (!strcmp(all->name, deps->data)) {
llist_t *implied = all->dependencies;
while (implied) {
/* XXX:FIXME: erm, it would be nicer to just
* llist_unlink(&mods->dependencies, implied) */
llist_t *prune = mods->dependencies;
while (prune) {
if (!strcmp(implied->data, prune->data))
break;
prune = prune->link;
}
//if (prune) bb_info_msg("[%s] '%s' implies '%s', removing", mods->name, all->name, implied->data);
llist_unlink(&mods->dependencies, prune);
implied = implied->link;
}
}
all = all->next;
}
deps = deps->link;
}
mods = mods->next;
}
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#endif
mods = G.lst;
/* Finally print them. */
while (mods) {
fprintf(filedes, "%s:", mods->name);
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/* If we did not resolve all modules, then it's likely that we just did
* not see the names of all prerequisites (which will be NULL in this
* case). */
while (mods->dependencies) {
char *the_dep = llist_pop(&mods->dependencies);
if (the_dep)
fprintf(filedes, " %s", the_dep);
}
fprintf(filedes, "\n");
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if (ENABLE_FEATURE_DEPMOD_ALIAS)
{
char *shortname =
xstrdup(bb_get_last_path_component_nostrip(mods->name));
char *tmp = strrstr(shortname, ".ko");
*tmp = '\0';
while (mods->aliases) {
fprintf(filedes, "alias %s %s\n",
(char*)llist_pop(&mods->aliases),
shortname);
}
free(shortname);
}
mods = mods->next;
}
}
if (ENABLE_FEATURE_CLEAN_UP) {
fclose_if_not_stdin(filedes);
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free(moddir);
while (G.lst) {
dep_lst_t *old = G.lst;
G.lst = G.lst->next;
free(old->name);
free(old);
}
}
return ret;
}