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kmod/tools/depmod.c
Michal Suchanek 9d1fb317c8 libkmod, depmod, modprobe: Make directory for kernel modules configurable 
Now that modprobe.d is searched under ${prefix}/lib, allow a complete
transition to files only under ${prefix} by adding a ${module_directory}
configuration. This specifies the directory where to search for kernel
modules and should match the location where the kernel/distro installs
them.

With this distributions that do not want to ship files in /lib can also
move kernel modules to /usr while others can keep them in /lib.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Link: https://lore.kernel.org/r/a3765f4e8ae3ce29c0847a0132d4a8d51ad040a9.1699618135.git.msuchanek@suse.de
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>
2023-12-06 09:53:05 -06:00

3154 lines
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/*
* kmod-depmod - calculate modules.dep using libkmod.
*
* Copyright (C) 2011-2013 ProFUSION embedded systems
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/utsname.h>
#include <shared/array.h>
#include <shared/hash.h>
#include <shared/macro.h>
#include <shared/util.h>
#include <shared/scratchbuf.h>
#include <libkmod/libkmod-internal.h>
#undef ERR
#undef DBG
#include "kmod.h"
#define DEFAULT_VERBOSE LOG_WARNING
static int verbose = DEFAULT_VERBOSE;
static const char CFG_BUILTIN_KEY[] = "built-in";
static const char CFG_EXTERNAL_KEY[] = "external";
static const char *const default_cfg_paths[] = {
SYSCONFDIR "/depmod.d",
"/run/depmod.d",
"/usr/local/lib/depmod.d",
DISTCONFDIR "/depmod.d",
"/lib/depmod.d",
NULL
};
static const char cmdopts_s[] = "aAb:o:C:E:F:euqrvnP:wmVh";
static const struct option cmdopts[] = {
{ "all", no_argument, 0, 'a' },
{ "quick", no_argument, 0, 'A' },
{ "basedir", required_argument, 0, 'b' },
{ "outdir", required_argument, 0, 'o' },
{ "config", required_argument, 0, 'C' },
{ "symvers", required_argument, 0, 'E' },
{ "filesyms", required_argument, 0, 'F' },
{ "errsyms", no_argument, 0, 'e' },
{ "unresolved-error", no_argument, 0, 'u' }, /* deprecated */
{ "quiet", no_argument, 0, 'q' }, /* deprecated */
{ "root", no_argument, 0, 'r' }, /* deprecated */
{ "verbose", no_argument, 0, 'v' },
{ "show", no_argument, 0, 'n' },
{ "dry-run", no_argument, 0, 'n' },
{ "symbol-prefix", required_argument, 0, 'P' },
{ "warn", no_argument, 0, 'w' },
{ "map", no_argument, 0, 'm' }, /* deprecated */
{ "version", no_argument, 0, 'V' },
{ "help", no_argument, 0, 'h' },
{ }
};
static void help(void)
{
printf("Usage:\n"
"\t%s -[aA] [options] [forced_version]\n"
"\n"
"If no arguments (except options) are given, \"depmod -a\" is assumed\n"
"\n"
"depmod will output a dependency list suitable for the modprobe utility.\n"
"\n"
"Options:\n"
"\t-a, --all Probe all modules\n"
"\t-A, --quick Only does the work if there's a new module\n"
"\t-e, --errsyms Report not supplied symbols\n"
"\t-n, --show Write the dependency file on stdout only\n"
"\t-P, --symbol-prefix Architecture symbol prefix\n"
"\t-C, --config=PATH Read configuration from PATH\n"
"\t-v, --verbose Enable verbose mode\n"
"\t-w, --warn Warn on duplicates\n"
"\t-V, --version show version\n"
"\t-h, --help show this help\n"
"\n"
"The following options are useful for people managing distributions:\n"
"\t-b, --basedir=DIR Use an image of a module tree.\n"
"\t-o, --outdir=DIR Output directory for generated files.\n"
"\t-F, --filesyms=FILE Use the file instead of the\n"
"\t current kernel symbols.\n"
"\t-E, --symvers=FILE Use Module.symvers file to check\n"
"\t symbol versions.\n",
program_invocation_short_name);
}
_printf_format_(1, 2)
static inline void _show(const char *fmt, ...)
{
va_list args;
if (verbose <= DEFAULT_VERBOSE)
return;
va_start(args, fmt);
vfprintf(stdout, fmt, args);
fflush(stdout);
va_end(args);
}
#define SHOW(...) _show(__VA_ARGS__)
/* binary index write *************************************************/
#include <arpa/inet.h>
/* BEGIN: code from module-init-tools/index.c just modified to compile here.
*
* Original copyright:
* index.c: module index file shared functions for modprobe and depmod
* Copyright (C) 2008 Alan Jenkins <alan-jenkins@tuffmail.co.uk>.
*
* These programs are free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with these programs. If not, see <http://www.gnu.org/licenses/>.
*/
/* see documentation in libkmod/libkmod-index.c */
#define INDEX_MAGIC 0xB007F457
#define INDEX_VERSION_MAJOR 0x0002
#define INDEX_VERSION_MINOR 0x0001
#define INDEX_VERSION ((INDEX_VERSION_MAJOR<<16)|INDEX_VERSION_MINOR)
#define INDEX_CHILDMAX 128
struct index_value {
struct index_value *next;
unsigned int priority;
char value[0];
};
/* In-memory index (depmod only) */
struct index_node {
char *prefix; /* path compression */
struct index_value *values;
unsigned char first; /* range of child nodes */
unsigned char last;
struct index_node *children[INDEX_CHILDMAX]; /* indexed by character */
};
/* Format of node offsets within index file */
enum node_offset {
INDEX_NODE_FLAGS = 0xF0000000, /* Flags in high nibble */
INDEX_NODE_PREFIX = 0x80000000,
INDEX_NODE_VALUES = 0x40000000,
INDEX_NODE_CHILDS = 0x20000000,
INDEX_NODE_MASK = 0x0FFFFFFF, /* Offset value */
};
static struct index_node *index_create(void)
{
struct index_node *node;
node = NOFAIL(calloc(1, sizeof(struct index_node)));
node->prefix = NOFAIL(strdup(""));
node->first = INDEX_CHILDMAX;
return node;
}
static void index_values_free(struct index_value *values)
{
while (values) {
struct index_value *value = values;
values = value->next;
free(value);
}
}
static void index_destroy(struct index_node *node)
{
int c;
for (c = node->first; c <= node->last; c++) {
struct index_node *child = node->children[c];
if (child)
index_destroy(child);
}
index_values_free(node->values);
free(node->prefix);
free(node);
}
static void index__checkstring(const char *str)
{
int i;
for (i = 0; str[i]; i++) {
int ch = str[i];
if (ch >= INDEX_CHILDMAX)
CRIT("Module index: bad character '%c'=0x%x - only 7-bit ASCII is supported:"
"\n%s\n", (char) ch, (int) ch, str);
}
}
static int index_add_value(struct index_value **values,
const char *value, unsigned int priority)
{
struct index_value *v;
int duplicate = 0;
int len;
/* report the presence of duplicate values */
for (v = *values; v; v = v->next) {
if (streq(v->value, value))
duplicate = 1;
}
/* find position to insert value */
while (*values && (*values)->priority < priority)
values = &(*values)->next;
len = strlen(value);
v = NOFAIL(calloc(1, sizeof(struct index_value) + len + 1));
v->next = *values;
v->priority = priority;
memcpy(v->value, value, len + 1);
*values = v;
return duplicate;
}
static int index_insert(struct index_node *node, const char *key,
const char *value, unsigned int priority)
{
int i = 0; /* index within str */
int ch;
index__checkstring(key);
index__checkstring(value);
while(1) {
int j; /* index within node->prefix */
/* Ensure node->prefix is a prefix of &str[i].
If it is not already, then we must split node. */
for (j = 0; node->prefix[j]; j++) {
ch = node->prefix[j];
if (ch != key[i+j]) {
char *prefix = node->prefix;
struct index_node *n;
/* New child is copy of node with prefix[j+1..N] */
n = NOFAIL(calloc(1, sizeof(struct index_node)));
memcpy(n, node, sizeof(struct index_node));
n->prefix = NOFAIL(strdup(&prefix[j+1]));
/* Parent has prefix[0..j], child at prefix[j] */
memset(node, 0, sizeof(struct index_node));
prefix[j] = '\0';
node->prefix = prefix;
node->first = ch;
node->last = ch;
node->children[ch] = n;
break;
}
}
/* j is now length of node->prefix */
i += j;
ch = key[i];
if(ch == '\0')
return index_add_value(&node->values, value, priority);
if (!node->children[ch]) {
struct index_node *child;
if (ch < node->first)
node->first = ch;
if (ch > node->last)
node->last = ch;
node->children[ch] = NOFAIL(calloc(1, sizeof(struct index_node)));
child = node->children[ch];
child->prefix = NOFAIL(strdup(&key[i+1]));
child->first = INDEX_CHILDMAX;
index_add_value(&child->values, value, priority);
return 0;
}
/* Descend into child node and continue */
node = node->children[ch];
i++;
}
}
static int index__haschildren(const struct index_node *node)
{
return node->first < INDEX_CHILDMAX;
}
/* Recursive post-order traversal
Pre-order would make for better read-side buffering / readahead / caching.
(post-order means you go backwards in the file as you descend the tree).
However, index reading is already fast enough.
Pre-order is simpler for writing, and depmod is already slow.
*/
static uint32_t index_write__node(const struct index_node *node, FILE *out)
{
uint32_t *child_offs = NULL;
int child_count = 0;
long offset;
if (!node)
return 0;
/* Write children and save their offsets */
if (index__haschildren(node)) {
const struct index_node *child;
int i;
child_count = node->last - node->first + 1;
child_offs = NOFAIL(malloc(child_count * sizeof(uint32_t)));
for (i = 0; i < child_count; i++) {
child = node->children[node->first + i];
child_offs[i] = htonl(index_write__node(child, out));
}
}
/* Now write this node */
offset = ftell(out);
if (node->prefix[0]) {
fputs(node->prefix, out);
fputc('\0', out);
offset |= INDEX_NODE_PREFIX;
}
if (child_count) {
fputc(node->first, out);
fputc(node->last, out);
fwrite(child_offs, sizeof(uint32_t), child_count, out);
offset |= INDEX_NODE_CHILDS;
}
free(child_offs);
if (node->values) {
const struct index_value *v;
unsigned int value_count;
uint32_t u;
value_count = 0;
for (v = node->values; v != NULL; v = v->next)
value_count++;
u = htonl(value_count);
fwrite(&u, sizeof(u), 1, out);
for (v = node->values; v != NULL; v = v->next) {
u = htonl(v->priority);
fwrite(&u, sizeof(u), 1, out);
fputs(v->value, out);
fputc('\0', out);
}
offset |= INDEX_NODE_VALUES;
}
return offset;
}
static void index_write(const struct index_node *node, FILE *out)
{
long initial_offset, final_offset;
uint32_t u;
u = htonl(INDEX_MAGIC);
fwrite(&u, sizeof(u), 1, out);
u = htonl(INDEX_VERSION);
fwrite(&u, sizeof(u), 1, out);
/* Second word is reserved for the offset of the root node */
initial_offset = ftell(out);
assert(initial_offset >= 0);
u = 0;
fwrite(&u, sizeof(uint32_t), 1, out);
/* Dump trie */
u = htonl(index_write__node(node, out));
/* Update first word */
final_offset = ftell(out);
assert(final_offset >= 0);
(void)fseek(out, initial_offset, SEEK_SET);
fwrite(&u, sizeof(uint32_t), 1, out);
(void)fseek(out, final_offset, SEEK_SET);
}
/* END: code from module-init-tools/index.c just modified to compile here.
*/
/* configuration parsing **********************************************/
struct cfg_override {
struct cfg_override *next;
size_t len;
char path[];
};
enum search_type {
SEARCH_PATH,
SEARCH_BUILTIN,
SEARCH_EXTERNAL
};
struct cfg_search {
struct cfg_search *next;
enum search_type type;
size_t len;
char path[];
};
struct cfg_external {
struct cfg_external *next;
size_t len;
char path[];
};
struct cfg_exclude {
struct cfg_exclude *next;
char exclude_dir[];
};
struct cfg {
const char *kversion;
char dirname[PATH_MAX];
size_t dirnamelen;
char outdirname[PATH_MAX];
size_t outdirnamelen;
char sym_prefix;
uint8_t check_symvers;
uint8_t print_unknown;
uint8_t warn_dups;
struct cfg_override *overrides;
struct cfg_search *searches;
struct cfg_external *externals;
struct cfg_exclude *excludes;
};
static enum search_type cfg_define_search_type(const char *path)
{
if (streq(path, CFG_BUILTIN_KEY))
return SEARCH_BUILTIN;
if (streq(path, CFG_EXTERNAL_KEY))
return SEARCH_EXTERNAL;
return SEARCH_PATH;
}
static int cfg_search_add(struct cfg *cfg, const char *path)
{
struct cfg_search *s;
size_t len;
enum search_type type;
type = cfg_define_search_type(path);
if (type != SEARCH_PATH)
len = 0;
else
len = strlen(path) + 1;
s = malloc(sizeof(struct cfg_search) + len);
if (s == NULL) {
ERR("search add: out of memory\n");
return -ENOMEM;
}
s->type = type;
if (type != SEARCH_PATH)
s->len = 0;
else {
s->len = len - 1;
memcpy(s->path, path, len);
}
DBG("search add: %s, search type=%hhu\n", path, type);
s->next = cfg->searches;
cfg->searches = s;
return 0;
}
static void cfg_search_free(struct cfg_search *s)
{
free(s);
}
static int cfg_override_add(struct cfg *cfg, const char *modname, const char *subdir)
{
struct cfg_override *o;
size_t modnamelen = strlen(modname);
size_t subdirlen = strlen(subdir);
size_t i;
o = malloc(sizeof(struct cfg_override) + subdirlen + 1
+ modnamelen + 1);
if (o == NULL) {
ERR("override add: out of memory\n");
return -ENOMEM;
}
memcpy(o->path, subdir, subdirlen);
i = subdirlen;
o->path[i] = '/';
i++;
memcpy(o->path + i, modname, modnamelen);
i += modnamelen;
o->path[i] = '\0'; /* no extension, so we can match .ko/.ko.gz */
o->len = i;
DBG("override add: %s\n", o->path);
o->next = cfg->overrides;
cfg->overrides = o;
return 0;
}
static void cfg_override_free(struct cfg_override *o)
{
free(o);
}
static int cfg_external_add(struct cfg *cfg, const char *path)
{
struct cfg_external *ext;
size_t len = strlen(path);
ext = malloc(sizeof(struct cfg_external) + len + 1);
if (ext == NULL) {
ERR("external add: out of memory\n");
return -ENOMEM;
}
strcpy(ext->path, path);
ext->len = len;
DBG("external add: %s\n", ext->path);
ext->next = cfg->externals;
cfg->externals = ext;
return 0;
}
static void cfg_external_free(struct cfg_external *ext)
{
free(ext);
}
static int cfg_exclude_add(struct cfg *cfg, const char *path)
{
struct cfg_exclude *exc;
size_t len = strlen(path);
exc = malloc(sizeof(struct cfg_exclude) + len + 1);
if (exc == NULL) {
ERR("exclude add: out of memory\n");
return -ENOMEM;
}
memcpy(exc->exclude_dir, path, len + 1);
DBG("exclude add: %s\n", path);
exc->next = cfg->excludes;
cfg->excludes = exc;
return 0;
}
static void cfg_exclude_free(struct cfg_exclude *exc)
{
free(exc);
}
static int cfg_kernel_matches(const struct cfg *cfg, const char *pattern)
{
regex_t re;
int status;
/* old style */
if (streq(pattern, "*"))
return 1;
if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB) != 0)
return 0;
status = regexec(&re, cfg->kversion, 0, NULL, 0);
regfree(&re);
return status == 0;
}
static int cfg_file_parse(struct cfg *cfg, const char *filename)
{
char *line;
FILE *fp;
unsigned int linenum = 0;
int err;
fp = fopen(filename, "r");
if (fp == NULL) {
err = -errno;
ERR("file parse %s: %m\n", filename);
return err;
}
while ((line = freadline_wrapped(fp, &linenum)) != NULL) {
char *cmd, *saveptr;
if (line[0] == '\0' || line[0] == '#')
goto done_next;
cmd = strtok_r(line, "\t ", &saveptr);
if (cmd == NULL)
goto done_next;
if (streq(cmd, "search")) {
const char *sp;
while ((sp = strtok_r(NULL, "\t ", &saveptr)) != NULL) {
cfg_search_add(cfg, sp);
}
} else if (streq(cmd, "override")) {
const char *modname = strtok_r(NULL, "\t ", &saveptr);
const char *version = strtok_r(NULL, "\t ", &saveptr);
const char *subdir = strtok_r(NULL, "\t ", &saveptr);
if (modname == NULL || version == NULL ||
subdir == NULL)
goto syntax_error;
if (!cfg_kernel_matches(cfg, version)) {
INF("%s:%u: override kernel did not match %s\n",
filename, linenum, version);
goto done_next;
}
cfg_override_add(cfg, modname, subdir);
} else if (streq(cmd, "external")) {
const char *version = strtok_r(NULL, "\t ", &saveptr);
const char *dir = strtok_r(NULL, "\t ", &saveptr);
if (version == NULL || dir == NULL)
goto syntax_error;
if (!cfg_kernel_matches(cfg, version)) {
INF("%s:%u: external directory did not match %s\n",
filename, linenum, version);
goto done_next;
}
cfg_external_add(cfg, dir);
} else if (streq(cmd, "exclude")) {
const char *sp;
while ((sp = strtok_r(NULL, "\t ", &saveptr)) != NULL) {
cfg_exclude_add(cfg, sp);
}
} else if (streq(cmd, "include")
|| streq(cmd, "make_map_files")) {
INF("%s:%u: command %s not implemented yet\n",
filename, linenum, cmd);
} else {
syntax_error:
ERR("%s:%u: ignoring bad line starting with '%s'\n",
filename, linenum, cmd);
}
done_next:
free(line);
}
fclose(fp);
return 0;
}
static int cfg_files_filter_out(DIR *d, const char *dir, const char *name)
{
size_t len = strlen(name);
struct stat st;
if (name[0] == '.')
return 1;
if (len < 6 || !streq(name + len - 5, ".conf")) {
INF("All cfg files need .conf: %s/%s\n", dir, name);
return 1;
}
fstatat(dirfd(d), name, &st, 0);
if (S_ISDIR(st.st_mode)) {
ERR("Directories inside directories are not supported: %s/%s\n",
dir, name);
return 1;
}
return 0;
}
struct cfg_file {
size_t dirlen;
size_t namelen;
const char *name;
char path[];
};
static void cfg_file_free(struct cfg_file *f)
{
free(f);
}
static int cfg_files_insert_sorted(struct cfg_file ***p_files, size_t *p_n_files,
const char *dir, const char *name)
{
struct cfg_file **files, *f;
size_t i, n_files, namelen, dirlen;
void *tmp;
dirlen = strlen(dir);
if (name != NULL)
namelen = strlen(name);
else {
name = basename(dir);
namelen = strlen(name);
dirlen -= namelen + 1;
}
n_files = *p_n_files;
files = *p_files;
for (i = 0; i < n_files; i++) {
int cmp = strcmp(name, files[i]->name);
if (cmp == 0) {
DBG("Ignoring duplicate config file: %.*s/%s\n",
(int)dirlen, dir, name);
return -EEXIST;
} else if (cmp < 0)
break;
}
f = malloc(sizeof(struct cfg_file) + dirlen + namelen + 2);
if (f == NULL) {
ERR("files insert sorted: out of memory\n");
return -ENOMEM;
}
tmp = realloc(files, sizeof(struct cfg_file *) * (n_files + 1));
if (tmp == NULL) {
ERR("files insert sorted: out of memory\n");
free(f);
return -ENOMEM;
}
*p_files = files = tmp;
if (i < n_files) {
memmove(files + i + 1, files + i,
sizeof(struct cfg_file *) * (n_files - i));
}
files[i] = f;
f->dirlen = dirlen;
f->namelen = namelen;
f->name = f->path + dirlen + 1;
memcpy(f->path, dir, dirlen);
f->path[dirlen] = '/';
memcpy(f->path + dirlen + 1, name, namelen);
f->path[dirlen + 1 + namelen] = '\0';
*p_n_files = n_files + 1;
return 0;
}
/*
* Insert configuration files ignoring duplicates
*/
static int cfg_files_list(struct cfg_file ***p_files, size_t *p_n_files,
const char *path)
{
struct dirent *dent;
DIR *d;
int err = 0;
struct stat st;
if (stat(path, &st) != 0) {
err = -errno;
DBG("could not stat '%s': %m\n", path);
return err;
}
if (!S_ISDIR(st.st_mode)) {
cfg_files_insert_sorted(p_files, p_n_files, path, NULL);
return 0;
}
d = opendir(path);
if (d == NULL) {
ERR("files list %s: %m\n", path);
return -EINVAL;
}
for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
if (cfg_files_filter_out(d, path, dent->d_name))
continue;
cfg_files_insert_sorted(p_files, p_n_files, path, dent->d_name);
}
closedir(d);
DBG("parsed configuration files from %s\n", path);
return err;
}
static int cfg_load(struct cfg *cfg, const char * const *cfg_paths)
{
size_t i, n_files = 0;
struct cfg_file **files = NULL;
if (cfg_paths == NULL)
cfg_paths = default_cfg_paths;
for (i = 0; cfg_paths[i] != NULL; i++)
cfg_files_list(&files, &n_files, cfg_paths[i]);
for (i = 0; i < n_files; i++) {
struct cfg_file *f = files[i];
cfg_file_parse(cfg, f->path);
cfg_file_free(f);
}
free(files);
/* For backward compatibility add "updates" to the head of the search
* list here. But only if there was no "search" option specified.
*/
if (cfg->searches == NULL)
cfg_search_add(cfg, "updates");
return 0;
}
static void cfg_free(struct cfg *cfg)
{
while (cfg->overrides) {
struct cfg_override *tmp = cfg->overrides;
cfg->overrides = cfg->overrides->next;
cfg_override_free(tmp);
}
while (cfg->searches) {
struct cfg_search *tmp = cfg->searches;
cfg->searches = cfg->searches->next;
cfg_search_free(tmp);
}
while (cfg->externals) {
struct cfg_external *tmp = cfg->externals;
cfg->externals = cfg->externals->next;
cfg_external_free(tmp);
}
while (cfg->excludes) {
struct cfg_exclude *tmp = cfg->excludes;
cfg->excludes = cfg->excludes->next;
cfg_exclude_free(tmp);
}
}
/* depmod calculations ***********************************************/
struct vertex;
struct mod {
struct kmod_module *kmod;
char *path;
const char *relpath; /* path relative to '$ROOT$MODULE_DIRECTORY/$VER/' */
char *uncrelpath; /* same as relpath but ending in .ko */
struct kmod_list *info_list;
struct kmod_list *dep_sym_list;
struct array deps; /* struct symbol */
size_t baselen; /* points to start of basename/filename */
size_t modnamesz;
int sort_idx; /* sort index using modules.order */
int dep_sort_idx; /* topological sort index */
uint16_t idx; /* index in depmod->modules.array */
uint16_t users; /* how many modules depend on this one */
bool visited; /* helper field to report cycles */
struct vertex *vertex; /* helper field to report cycles */
char modname[];
};
struct symbol {
struct mod *owner;
uint64_t crc;
char name[];
};
struct depmod {
const struct cfg *cfg;
struct kmod_ctx *ctx;
struct array modules;
struct hash *modules_by_uncrelpath;
struct hash *modules_by_name;
struct hash *symbols;
};
static void mod_free(struct mod *mod)
{
DBG("free %p kmod=%p, path=%s\n", mod, mod->kmod, mod->path);
array_free_array(&mod->deps);
kmod_module_unref(mod->kmod);
kmod_module_info_free_list(mod->info_list);
kmod_module_dependency_symbols_free_list(mod->dep_sym_list);
free(mod->uncrelpath);
free(mod->path);
free(mod);
}
static int mod_add_dependency(struct mod *mod, struct symbol *sym)
{
int err;
DBG("%s depends on %s %s\n", mod->path, sym->name,
sym->owner != NULL ? sym->owner->path : "(unknown)");
if (sym->owner == NULL)
return 0;
err = array_append_unique(&mod->deps, sym->owner);
if (err == -EEXIST)
return 0;
if (err < 0)
return err;
sym->owner->users++;
SHOW("%s needs \"%s\": %s\n", mod->path, sym->name, sym->owner->path);
return 0;
}
static void symbol_free(struct symbol *sym)
{
DBG("free %p sym=%s, owner=%p %s\n", sym, sym->name, sym->owner,
sym->owner != NULL ? sym->owner->path : "");
free(sym);
}
static int depmod_init(struct depmod *depmod, struct cfg *cfg,
struct kmod_ctx *ctx)
{
int err = 0;
depmod->cfg = cfg;
depmod->ctx = ctx;
array_init(&depmod->modules, 128);
depmod->modules_by_uncrelpath = hash_new(512, NULL);
if (depmod->modules_by_uncrelpath == NULL) {
err = -errno;
goto modules_by_uncrelpath_failed;
}
depmod->modules_by_name = hash_new(512, NULL);
if (depmod->modules_by_name == NULL) {
err = -errno;
goto modules_by_name_failed;
}
depmod->symbols = hash_new(2048, (void (*)(void *))symbol_free);
if (depmod->symbols == NULL) {
err = -errno;
goto symbols_failed;
}
return 0;
symbols_failed:
hash_free(depmod->modules_by_name);
modules_by_name_failed:
hash_free(depmod->modules_by_uncrelpath);
modules_by_uncrelpath_failed:
return err;
}
static void depmod_shutdown(struct depmod *depmod)
{
size_t i;
hash_free(depmod->symbols);
hash_free(depmod->modules_by_uncrelpath);
hash_free(depmod->modules_by_name);
for (i = 0; i < depmod->modules.count; i++)
mod_free(depmod->modules.array[i]);
array_free_array(&depmod->modules);
kmod_unref(depmod->ctx);
}
static int depmod_module_add(struct depmod *depmod, struct kmod_module *kmod)
{
const struct cfg *cfg = depmod->cfg;
const char *modname, *lastslash;
size_t modnamesz;
struct mod *mod;
int err;
modname = kmod_module_get_name(kmod);
modnamesz = strlen(modname) + 1;
mod = calloc(1, sizeof(struct mod) + modnamesz);
if (mod == NULL)
return -ENOMEM;
mod->kmod = kmod;
mod->sort_idx = depmod->modules.count + 1;
mod->dep_sort_idx = INT32_MAX;
memcpy(mod->modname, modname, modnamesz);
mod->modnamesz = modnamesz;
array_init(&mod->deps, 4);
mod->path = strdup(kmod_module_get_path(kmod));
lastslash = strrchr(mod->path, '/');
mod->baselen = lastslash - mod->path;
if (strncmp(mod->path, cfg->dirname, cfg->dirnamelen) == 0 &&
mod->path[cfg->dirnamelen] == '/')
mod->relpath = mod->path + cfg->dirnamelen + 1;
else
mod->relpath = NULL;
err = hash_add_unique(depmod->modules_by_name, mod->modname, mod);
if (err < 0) {
ERR("hash_add_unique %s: %s\n", mod->modname, strerror(-err));
goto fail;
}
if (mod->relpath != NULL) {
size_t uncrelpathlen = lastslash - mod->relpath + modnamesz
+ strlen(KMOD_EXTENSION_UNCOMPRESSED);
mod->uncrelpath = memdup(mod->relpath, uncrelpathlen + 1);
mod->uncrelpath[uncrelpathlen] = '\0';
err = hash_add_unique(depmod->modules_by_uncrelpath,
mod->uncrelpath, mod);
if (err < 0) {
ERR("hash_add_unique %s: %s\n",
mod->uncrelpath, strerror(-err));
hash_del(depmod->modules_by_name, mod->modname);
goto fail;
}
}
DBG("add %p kmod=%p, path=%s\n", mod, kmod, mod->path);
return 0;
fail:
free(mod->uncrelpath);
free(mod);
return err;
}
static int depmod_module_del(struct depmod *depmod, struct mod *mod)
{
DBG("del %p kmod=%p, path=%s\n", mod, mod->kmod, mod->path);
if (mod->uncrelpath != NULL)
hash_del(depmod->modules_by_uncrelpath, mod->uncrelpath);
hash_del(depmod->modules_by_name, mod->modname);
mod_free(mod);
return 0;
}
static const char *search_to_string(const struct cfg_search *s)
{
switch(s->type) {
case SEARCH_EXTERNAL:
return "external";
case SEARCH_BUILTIN:
return "built-in";
default:
return s->path;
}
}
static bool depmod_is_path_starts_with(const char *path,
size_t pathlen,
const char *prefix,
size_t prefix_len)
{
if (pathlen <= prefix_len)
return false;
if (path[prefix_len] != '/')
return false;
if (memcmp(path, prefix, prefix_len) != 0)
return false;
return true;
}
/* returns if existing module @mod is higher priority than newpath.
* note this is the inverse of module-init-tools is_higher_priority()
*/
static int depmod_module_is_higher_priority(const struct depmod *depmod, const struct mod *mod, size_t baselen, size_t namelen, size_t modnamelen, const char *newpath)
{
const struct cfg *cfg = depmod->cfg;
const struct cfg_override *ov;
const struct cfg_search *se;
const struct cfg_external *ext;
/* baselen includes the last '/' and mod->baselen doesn't. So it's
* actually correct to use modnamelen in the first and modnamesz in
* the latter */
size_t newlen = baselen + modnamelen;
size_t oldlen = mod->baselen + mod->modnamesz;
const char *oldpath = mod->path;
int i, bprio = -1, oldprio = -1, newprio = -1;
size_t relnewlen = 0;
size_t reloldlen = 0;
const char *relnewpath = NULL;
const char *reloldpath = NULL;
DBG("comparing priorities of %s and %s\n",
oldpath, newpath);
if (strncmp(newpath, cfg->dirname, cfg->dirnamelen) == 0) {
relnewpath = newpath + cfg->dirnamelen + 1;
relnewlen = newlen - (cfg->dirnamelen + 1);
}
if (strncmp(oldpath, cfg->dirname, cfg->dirnamelen) == 0) {
reloldpath = oldpath + cfg->dirnamelen + 1;
reloldlen = oldlen - (cfg->dirnamelen + 1);
}
for (ov = cfg->overrides; ov != NULL; ov = ov->next) {
DBG("override %s\n", ov->path);
if (relnewlen == ov->len &&
memcmp(ov->path, relnewpath, relnewlen) == 0)
return 0;
if (reloldlen == ov->len &&
memcmp(ov->path, reloldpath, reloldlen) == 0)
return 1;
}
for (i = 0, se = cfg->searches; se != NULL; se = se->next, i++) {
DBG("search %s\n", search_to_string(se));
if (se->type == SEARCH_BUILTIN)
bprio = i;
else if (se->type == SEARCH_EXTERNAL) {
for (ext = cfg->externals; ext != NULL; ext = ext->next, i++) {
if (depmod_is_path_starts_with(newpath,
newlen,
ext->path,
ext->len))
newprio = i;
if (depmod_is_path_starts_with(oldpath,
oldlen,
ext->path,
ext->len))
oldprio = i;
}
} else if (relnewlen > se->len && relnewpath[se->len] == '/' &&
memcmp(se->path, relnewpath, se->len) == 0)
newprio = i;
else if (reloldlen > se->len && reloldpath[se->len] == '/' &&
memcmp(se->path, reloldpath, se->len) == 0)
oldprio = i;
}
if (newprio < 0)
newprio = bprio;
if (oldprio < 0)
oldprio = bprio;
DBG("priorities: built-in: %d, old: %d, new: %d\n",
bprio, oldprio, newprio);
return newprio <= oldprio;
}
static int depmod_modules_search_file(struct depmod *depmod, size_t baselen, size_t namelen, const char *path)
{
struct kmod_module *kmod;
struct mod *mod;
const char *relpath;
char modname[PATH_MAX];
size_t modnamelen;
int err;
if (!path_ends_with_kmod_ext(path + baselen, namelen))
return 0;
if (path_to_modname(path, modname, &modnamelen) == NULL) {
ERR("could not get modname from path %s\n", path);
return -EINVAL;
}
relpath = path + depmod->cfg->dirnamelen + 1;
DBG("try %s (%s)\n", relpath, modname);
mod = hash_find(depmod->modules_by_name, modname);
if (mod == NULL)
goto add;
if (depmod_module_is_higher_priority(depmod, mod, baselen,
namelen, modnamelen, path)) {
DBG("Ignored lower priority: %s, higher: %s\n",
path, mod->path);
return 0;
}
DBG("Replace lower priority %s with new module %s\n",
mod->relpath, relpath);
err = depmod_module_del(depmod, mod);
if (err < 0) {
ERR("could not del module %s: %s\n", mod->path, strerror(-err));
return err;
}
add:
err = kmod_module_new_from_path(depmod->ctx, path, &kmod);
if (err < 0) {
ERR("could not create module %s: %s\n", path, strerror(-err));
return err;
}
err = depmod_module_add(depmod, kmod);
if (err < 0) {
ERR("could not add module %s: %s\n",
path, strerror(-err));
kmod_module_unref(kmod);
return err;
}
return 0;
}
static bool should_exclude_dir(const struct cfg *cfg, const char *name)
{
struct cfg_exclude *exc;
if (name[0] == '.' && (name[1] == '\0' ||
(name[1] == '.' && name[2] == '\0')))
return true;
if (streq(name, "build") || streq(name, "source"))
return true;
for (exc = cfg->excludes; exc != NULL; exc = exc->next) {
if (streq(name, exc->exclude_dir))
return true;
}
return false;
}
static int depmod_modules_search_dir(struct depmod *depmod, DIR *d, size_t baselen, struct scratchbuf *s_path)
{
struct dirent *de;
int err = 0, dfd = dirfd(d);
char *path;
while ((de = readdir(d)) != NULL) {
const char *name = de->d_name;
size_t namelen;
uint8_t is_dir;
if (should_exclude_dir(depmod->cfg, name))
continue;
namelen = strlen(name);
if (scratchbuf_alloc(s_path, baselen + namelen + 2) < 0) {
err = -ENOMEM;
ERR("No memory\n");
continue;
}
path = scratchbuf_str(s_path);
memcpy(path + baselen, name, namelen + 1);
if (de->d_type == DT_REG)
is_dir = 0;
else if (de->d_type == DT_DIR)
is_dir = 1;
else {
struct stat st;
if (fstatat(dfd, name, &st, 0) < 0) {
ERR("fstatat(%d, %s): %m\n", dfd, name);
continue;
} else if (S_ISREG(st.st_mode))
is_dir = 0;
else if (S_ISDIR(st.st_mode))
is_dir = 1;
else {
ERR("unsupported file type %s: %o\n",
path, st.st_mode & S_IFMT);
continue;
}
}
if (is_dir) {
int fd;
DIR *subdir;
fd = openat(dfd, name, O_RDONLY);
if (fd < 0) {
ERR("openat(%d, %s, O_RDONLY): %m\n",
dfd, name);
continue;
}
subdir = fdopendir(fd);
if (subdir == NULL) {
ERR("fdopendir(%d): %m\n", fd);
close(fd);
continue;
}
path[baselen + namelen] = '/';
path[baselen + namelen + 1] = '\0';
err = depmod_modules_search_dir(depmod, subdir,
baselen + namelen + 1,
s_path);
closedir(subdir);
} else {
err = depmod_modules_search_file(depmod, baselen,
namelen, path);
}
if (err < 0) {
path[baselen + namelen] = '\0';
ERR("failed %s: %s\n", path, strerror(-err));
err = 0; /* ignore errors */
}
}
return err;
}
static int depmod_modules_search_path(struct depmod *depmod,
const char *path)
{
char buf[256];
_cleanup_(scratchbuf_release) struct scratchbuf s_path_buf =
SCRATCHBUF_INITIALIZER(buf);
char *path_buf;
DIR *d;
size_t baselen;
int err;
d = opendir(path);
if (d == NULL) {
err = -errno;
ERR("could not open directory %s: %m\n", path);
return err;
}
baselen = strlen(path);
if (scratchbuf_alloc(&s_path_buf, baselen + 2) < 0) {
err = -ENOMEM;
goto out;
}
path_buf = scratchbuf_str(&s_path_buf);
memcpy(path_buf, path, baselen);
path_buf[baselen] = '/';
baselen++;
path_buf[baselen] = '\0';
err = depmod_modules_search_dir(depmod, d, baselen, &s_path_buf);
out:
closedir(d);
return err;
}
static int depmod_modules_search(struct depmod *depmod)
{
int err;
struct cfg_external *ext;
err = depmod_modules_search_path(depmod, depmod->cfg->dirname);
if (err < 0)
return err;
for (ext = depmod->cfg->externals; ext != NULL; ext = ext->next) {
err = depmod_modules_search_path(depmod, ext->path);
if (err < 0 && err == -ENOENT)
/* ignore external dir absense */
continue;
}
return 0;
}
static int mod_cmp(const void *pa, const void *pb) {
const struct mod *a = *(const struct mod **)pa;
const struct mod *b = *(const struct mod **)pb;
return a->sort_idx - b->sort_idx;
}
static int depmod_modules_build_array(struct depmod *depmod)
{
struct hash_iter module_iter;
const void *v;
int err;
hash_iter_init(depmod->modules_by_name, &module_iter);
while (hash_iter_next(&module_iter, NULL, &v)) {
struct mod *mod = (struct mod *) v;
mod->idx = depmod->modules.count;
err = array_append(&depmod->modules, mod);
if (err < 0)
return err;
}
return 0;
}
static FILE *dfdopen(const char *dname, const char *filename, int flags,
const char *mode)
{
int fd, dfd;
FILE *ret;
dfd = open(dname, O_RDONLY);
if (dfd < 0) {
WRN("could not open directory %s: %m\n", dname);
return NULL;
}
fd = openat(dfd, filename, flags);
if (fd < 0) {
WRN("could not open %s at %s: %m\n", filename, dname);
ret = NULL;
} else {
ret = fdopen(fd, mode);
if (!ret) {
WRN("could not associate stream with %s: %m\n", filename);
close(fd);
}
}
close(dfd);
return ret;
}
static void depmod_modules_sort(struct depmod *depmod)
{
char line[PATH_MAX];
const char *order_file = "modules.order";
FILE *fp;
unsigned idx = 0, total = 0;
fp = dfdopen(depmod->cfg->dirname, order_file, O_RDONLY, "r");
if (fp == NULL)
return;
while (fgets(line, sizeof(line), fp) != NULL) {
size_t len = strlen(line);
idx++;
if (len == 0)
continue;
if (line[len - 1] != '\n') {
ERR("%s/%s:%u corrupted line misses '\\n'\n",
depmod->cfg->dirname, order_file, idx);
goto corrupted;
}
}
total = idx + 1;
idx = 0;
fseek(fp, 0, SEEK_SET);
while (fgets(line, sizeof(line), fp) != NULL) {
size_t len = strlen(line);
struct mod *mod;
idx++;
if (len == 0)
continue;
line[len - 1] = '\0';
mod = hash_find(depmod->modules_by_uncrelpath, line);
if (mod == NULL)
continue;
mod->sort_idx = idx - total;
}
array_sort(&depmod->modules, mod_cmp);
for (idx = 0; idx < depmod->modules.count; idx++) {
struct mod *m = depmod->modules.array[idx];
m->idx = idx;
}
corrupted:
fclose(fp);
}
static int depmod_symbol_add(struct depmod *depmod, const char *name,
bool prefix_skipped, uint64_t crc,
const struct mod *owner)
{
size_t namelen;
int err;
struct symbol *sym;
if (!prefix_skipped && (name[0] == depmod->cfg->sym_prefix))
name++;
namelen = strlen(name) + 1;
sym = malloc(sizeof(struct symbol) + namelen);
if (sym == NULL)
return -ENOMEM;
sym->owner = (struct mod *)owner;
sym->crc = crc;
memcpy(sym->name, name, namelen);
err = hash_add(depmod->symbols, sym->name, sym);
if (err < 0) {
free(sym);
return err;
}
DBG("add %p sym=%s, owner=%p %s\n", sym, sym->name, owner,
owner != NULL ? owner->path : "");
return 0;
}
static struct symbol *depmod_symbol_find(const struct depmod *depmod,
const char *name)
{
if (name[0] == '.') /* PPC64 needs this: .foo == foo */
name++;
if (name[0] == depmod->cfg->sym_prefix)
name++;
return hash_find(depmod->symbols, name);
}
static int depmod_load_modules(struct depmod *depmod)
{
struct mod **itr, **itr_end;
DBG("load symbols (%zd modules)\n", depmod->modules.count);
itr = (struct mod **)depmod->modules.array;
itr_end = itr + depmod->modules.count;
for (; itr < itr_end; itr++) {
struct mod *mod = *itr;
struct kmod_list *l, *list = NULL;
int err = kmod_module_get_symbols(mod->kmod, &list);
if (err < 0) {
if (err == -ENODATA)
DBG("ignoring %s: no symbols\n", mod->path);
else
ERR("failed to load symbols from %s: %s\n",
mod->path, strerror(-err));
goto load_info;
}
kmod_list_foreach(l, list) {
const char *name = kmod_module_symbol_get_symbol(l);
uint64_t crc = kmod_module_symbol_get_crc(l);
depmod_symbol_add(depmod, name, false, crc, mod);
}
kmod_module_symbols_free_list(list);
load_info:
kmod_module_get_info(mod->kmod, &mod->info_list);
kmod_module_get_dependency_symbols(mod->kmod,
&mod->dep_sym_list);
kmod_module_unref(mod->kmod);
mod->kmod = NULL;
}
DBG("loaded symbols (%zd modules, %u symbols)\n",
depmod->modules.count, hash_get_count(depmod->symbols));
return 0;
}
static int depmod_load_module_dependencies(struct depmod *depmod, struct mod *mod)
{
const struct cfg *cfg = depmod->cfg;
struct kmod_list *l;
DBG("do dependencies of %s\n", mod->path);
kmod_list_foreach(l, mod->dep_sym_list) {
const char *name = kmod_module_dependency_symbol_get_symbol(l);
uint64_t crc = kmod_module_dependency_symbol_get_crc(l);
int bindtype = kmod_module_dependency_symbol_get_bind(l);
struct symbol *sym = depmod_symbol_find(depmod, name);
uint8_t is_weak = bindtype == KMOD_SYMBOL_WEAK;
if (sym == NULL) {
DBG("%s needs (%c) unknown symbol %s\n",
mod->path, bindtype, name);
if (cfg->print_unknown && !is_weak)
WRN("%s needs unknown symbol %s\n",
mod->path, name);
continue;
}
if (cfg->check_symvers && sym->crc != crc && !is_weak) {
DBG("symbol %s (%#"PRIx64") module %s (%#"PRIx64")\n",
sym->name, sym->crc, mod->path, crc);
if (cfg->print_unknown)
WRN("%s disagrees about version of symbol %s\n",
mod->path, name);
}
mod_add_dependency(mod, sym);
}
return 0;
}
static int depmod_load_dependencies(struct depmod *depmod)
{
struct mod **itr, **itr_end;
DBG("load dependencies (%zd modules, %u symbols)\n",
depmod->modules.count, hash_get_count(depmod->symbols));
itr = (struct mod **)depmod->modules.array;
itr_end = itr + depmod->modules.count;
for (; itr < itr_end; itr++) {
struct mod *mod = *itr;
if (mod->dep_sym_list == NULL) {
DBG("ignoring %s: no dependency symbols\n", mod->path);
continue;
}
depmod_load_module_dependencies(depmod, mod);
}
DBG("loaded dependencies (%zd modules, %u symbols)\n",
depmod->modules.count, hash_get_count(depmod->symbols));
return 0;
}
static int dep_cmp(const void *pa, const void *pb)
{
const struct mod *a = *(const struct mod **)pa;
const struct mod *b = *(const struct mod **)pb;
return a->dep_sort_idx - b->dep_sort_idx;
}
static void depmod_sort_dependencies(struct depmod *depmod)
{
struct mod **itr, **itr_end;
itr = (struct mod **)depmod->modules.array;
itr_end = itr + depmod->modules.count;
for (; itr < itr_end; itr++) {
struct mod *m = *itr;
if (m->deps.count > 1)
array_sort(&m->deps, dep_cmp);
}
}
struct vertex {
struct vertex *parent;
struct mod *mod;
};
static struct vertex *vertex_new(struct mod *mod, struct vertex *parent)
{
struct vertex *v;
v = malloc(sizeof(*v));
if (v == NULL)
return NULL;
v->parent = parent;
v->mod = mod;
return v;
}
static void depmod_list_remove_data(struct kmod_list **list, void *data)
{
struct kmod_list *l;
l = kmod_list_remove_data(*list, data);
*list = l;
}
static int depmod_report_one_cycle(struct depmod *depmod,
struct vertex *vertex,
struct kmod_list **roots,
struct hash *loop_set)
{
const char sep[] = " -> ";
size_t sz;
char *buf;
struct array reverse;
int i;
int n;
struct vertex *v;
int rc;
array_init(&reverse, 3);
sz = 0;
for (v = vertex->parent, n = 0;
v != NULL;
v = v->parent, n++) {
sz += v->mod->modnamesz - 1;
array_append(&reverse, v);
rc = hash_add(loop_set, v->mod->modname, NULL);
if (rc != 0)
return rc;
/* the hash will be freed where created */
}
sz += vertex->mod->modnamesz - 1;
buf = malloc(sz + n * strlen(sep) + 1);
sz = 0;
for (i = reverse.count - 1; i >= 0; i--) {
size_t len;
v = reverse.array[i];
len = v->mod->modnamesz - 1;
memcpy(buf + sz, v->mod->modname, len);
sz += len;
strcpy(buf + sz, sep);
sz += strlen(sep);
depmod_list_remove_data(roots, v->mod);
}
strcpy(buf + sz, vertex->mod->modname);
ERR("Cycle detected: %s\n", buf);
free(buf);
array_free_array(&reverse);
return 0;
}
static int depmod_report_cycles_from_root(struct depmod *depmod,
struct mod *root_mod,
struct kmod_list **roots,
void **stack,
size_t stack_size,
struct hash *loop_set)
{
struct kmod_list *free_list = NULL; /* struct vertex */
struct kmod_list *l;
struct vertex *root;
struct vertex *vertex;
struct vertex *v;
struct mod *m;
struct mod **itr, **itr_end;
size_t is;
int ret = -ENOMEM;
root = vertex_new(root_mod, NULL);
if (root == NULL) {
ERR("No memory to report cycles\n");
goto out;
}
l = kmod_list_append(free_list, root);
if (l == NULL) {
ERR("No memory to report cycles\n");
goto out;
}
free_list = l;
is = 0;
stack[is++] = (void *)root;
while (is > 0) {
vertex = stack[--is];
m = vertex->mod;
/*
* because of the topological sort we can start only
* from part of a loop or from a branch after a loop
*/
if (m->visited && m == root->mod) {
int rc;
rc = depmod_report_one_cycle(depmod, vertex,
roots, loop_set);
if (rc != 0) {
ret = rc;
goto out;
}
continue;
}
m->visited = true;
if (m->deps.count == 0) {
/*
* boundary condition: if there is more than one
* single node branch (not a loop), it is
* recognized as a loop by the code above:
* m->visited because more then one,
* m == root->mod since it is a single node.
* So, prevent deeping into the branch second
* time.
*/
depmod_list_remove_data(roots, m);
continue;
}
itr = (struct mod **) m->deps.array;
itr_end = itr + m->deps.count;
for (; itr < itr_end; itr++) {
struct mod *dep = *itr;
v = vertex_new(dep, vertex);
if (v == NULL) {
ERR("No memory to report cycles\n");
goto out;
}
assert(is < stack_size);
stack[is++] = v;
l = kmod_list_append(free_list, v);
if (l == NULL) {
ERR("No memory to report cycles\n");
goto out;
}
free_list = l;
}
}
ret = 0;
out:
while (free_list) {
v = free_list->data;
l = kmod_list_remove(free_list);
free_list = l;
free(v);
}
return ret;
}
static void depmod_report_cycles(struct depmod *depmod, uint16_t n_mods,
uint16_t *users)
{
int num_cyclic = 0;
struct kmod_list *roots = NULL; /* struct mod */
struct kmod_list *l;
size_t n_r; /* local n_roots */
int i;
int err;
_cleanup_free_ void **stack = NULL;
struct mod *m;
struct mod *root;
struct hash *loop_set;
for (i = 0, n_r = 0; i < n_mods; i++) {
if (users[i] <= 0)
continue;
m = depmod->modules.array[i];
l = kmod_list_append(roots, m);
if (l == NULL) {
ERR("No memory to report cycles\n");
goto out_list;
}
roots = l;
n_r++;
}
stack = malloc(n_r * sizeof(void *));
if (stack == NULL) {
ERR("No memory to report cycles\n");
goto out_list;
}
loop_set = hash_new(16, NULL);
if (loop_set == NULL) {
ERR("No memory to report cycles\n");
goto out_list;
}
while (roots != NULL) {
root = roots->data;
l = kmod_list_remove(roots);
roots = l;
err = depmod_report_cycles_from_root(depmod,
root,
&roots,
stack, n_r, loop_set);
if (err < 0)
goto out_hash;
}
num_cyclic = hash_get_count(loop_set);
ERR("Found %d modules in dependency cycles!\n", num_cyclic);
out_hash:
hash_free(loop_set);
out_list:
while (roots != NULL) {
/* no need to free data, come from outside */
roots = kmod_list_remove(roots);
}
}
static int depmod_calculate_dependencies(struct depmod *depmod)
{
const struct mod **itrm;
uint16_t *users, *roots, *sorted;
uint16_t i, n_roots = 0, n_sorted = 0, n_mods = depmod->modules.count;
int ret = 0;
users = malloc(sizeof(uint16_t) * n_mods * 3);
if (users == NULL)
return -ENOMEM;
roots = users + n_mods;
sorted = roots + n_mods;
DBG("calculate dependencies and ordering (%hu modules)\n", n_mods);
assert(depmod->modules.count < UINT16_MAX);
/* populate modules users (how many modules uses it) */
itrm = (const struct mod **)depmod->modules.array;
for (i = 0; i < n_mods; i++, itrm++) {
const struct mod *m = *itrm;
users[i] = m->users;
if (users[i] == 0) {
roots[n_roots] = i;
n_roots++;
}
}
/* topological sort (outputs modules without users first) */
while (n_roots > 0) {
const struct mod **itr_dst, **itr_dst_end;
struct mod *src;
uint16_t src_idx = roots[--n_roots];
src = depmod->modules.array[src_idx];
src->dep_sort_idx = n_sorted;
sorted[n_sorted] = src_idx;
n_sorted++;
itr_dst = (const struct mod **)src->deps.array;
itr_dst_end = itr_dst + src->deps.count;
for (; itr_dst < itr_dst_end; itr_dst++) {
const struct mod *dst = *itr_dst;
uint16_t dst_idx = dst->idx;
assert(users[dst_idx] > 0);
users[dst_idx]--;
if (users[dst_idx] == 0) {
roots[n_roots] = dst_idx;
n_roots++;
}
}
}
if (n_sorted < n_mods) {
depmod_report_cycles(depmod, n_mods, users);
ret = -EINVAL;
goto exit;
}
depmod_sort_dependencies(depmod);
DBG("calculated dependencies and ordering (%hu modules)\n", n_mods);
exit:
free(users);
return ret;
}
static int depmod_load(struct depmod *depmod)
{
int err;
err = depmod_load_modules(depmod);
if (err < 0)
return err;
err = depmod_load_dependencies(depmod);
if (err < 0)
return err;
err = depmod_calculate_dependencies(depmod);
if (err < 0)
return err;
return 0;
}
static size_t mod_count_all_dependencies(const struct mod *mod)
{
size_t i, count = 0;
for (i = 0; i < mod->deps.count; i++) {
const struct mod *d = mod->deps.array[i];
count += 1 + mod_count_all_dependencies(d);
}
return count;
}
static int mod_fill_all_unique_dependencies(const struct mod *mod, const struct mod **deps, size_t n_deps, size_t *last)
{
size_t i;
int err = 0;
for (i = 0; i < mod->deps.count; i++) {
const struct mod *d = mod->deps.array[i];
size_t j;
uint8_t exists = 0;
for (j = 0; j < *last; j++) {
if (deps[j] == d) {
exists = 1;
break;
}
}
if (exists)
continue;
if (*last >= n_deps)
return -ENOSPC;
deps[*last] = d;
(*last)++;
err = mod_fill_all_unique_dependencies(d, deps, n_deps, last);
if (err < 0)
break;
}
return err;
}
static const struct mod **mod_get_all_sorted_dependencies(const struct mod *mod, size_t *n_deps)
{
const struct mod **deps;
size_t last = 0;
*n_deps = mod_count_all_dependencies(mod);
if (*n_deps == 0)
return NULL;
deps = malloc(sizeof(struct mod *) * (*n_deps));
if (deps == NULL)
return NULL;
if (mod_fill_all_unique_dependencies(mod, deps, *n_deps, &last) < 0) {
free(deps);
return NULL;
}
qsort(deps, last, sizeof(struct mod *), dep_cmp);
*n_deps = last;
return deps;
}
static inline const char *mod_get_compressed_path(const struct mod *mod)
{
if (mod->relpath != NULL)
return mod->relpath;
return mod->path;
}
static int output_deps(struct depmod *depmod, FILE *out)
{
size_t i;
for (i = 0; i < depmod->modules.count; i++) {
const struct mod **deps, *mod = depmod->modules.array[i];
const char *p = mod_get_compressed_path(mod);
size_t j, n_deps;
fprintf(out, "%s:", p);
if (mod->deps.count == 0)
goto end;
deps = mod_get_all_sorted_dependencies(mod, &n_deps);
if (deps == NULL) {
ERR("could not get all sorted dependencies of %s\n", p);
goto end;
}
for (j = 0; j < n_deps; j++) {
const struct mod *d = deps[j];
fprintf(out, " %s", mod_get_compressed_path(d));
}
free(deps);
end:
putc('\n', out);
}
return 0;
}
static int output_deps_bin(struct depmod *depmod, FILE *out)
{
struct index_node *idx;
size_t i;
if (out == stdout)
return 0;
idx = index_create();
if (idx == NULL)
return -ENOMEM;
for (i = 0; i < depmod->modules.count; i++) {
const struct mod **deps, *mod = depmod->modules.array[i];
const char *p = mod_get_compressed_path(mod);
char *line;
size_t j, n_deps, linepos, linelen, slen;
int duplicate;
deps = mod_get_all_sorted_dependencies(mod, &n_deps);
if (deps == NULL && n_deps > 0) {
ERR("could not get all sorted dependencies of %s\n", p);
continue;
}
linelen = strlen(p) + 1;
for (j = 0; j < n_deps; j++) {
const struct mod *d = deps[j];
linelen += 1 + strlen(mod_get_compressed_path(d));
}
line = malloc(linelen + 1);
if (line == NULL) {
free(deps);
ERR("modules.deps.bin: out of memory\n");
continue;
}
linepos = 0;
slen = strlen(p);
memcpy(line + linepos, p, slen);
linepos += slen;
line[linepos] = ':';
linepos++;
for (j = 0; j < n_deps; j++) {
const struct mod *d = deps[j];
const char *dp;
line[linepos] = ' ';
linepos++;
dp = mod_get_compressed_path(d);
slen = strlen(dp);
memcpy(line + linepos, dp, slen);
linepos += slen;
}
line[linepos] = '\0';
duplicate = index_insert(idx, mod->modname, line, mod->idx);
if (duplicate && depmod->cfg->warn_dups)
WRN("duplicate module deps:\n%s\n", line);
free(line);
free(deps);
}
index_write(idx, out);
index_destroy(idx);
return 0;
}
static int output_aliases(struct depmod *depmod, FILE *out)
{
size_t i;
fputs("# Aliases extracted from modules themselves.\n", out);
for (i = 0; i < depmod->modules.count; i++) {
const struct mod *mod = depmod->modules.array[i];
struct kmod_list *l;
kmod_list_foreach(l, mod->info_list) {
const char *key = kmod_module_info_get_key(l);
const char *value = kmod_module_info_get_value(l);
if (!streq(key, "alias"))
continue;
fprintf(out, "alias %s %s\n", value, mod->modname);
}
}
return 0;
}
static int output_aliases_bin(struct depmod *depmod, FILE *out)
{
struct index_node *idx;
size_t i;
if (out == stdout)
return 0;
idx = index_create();
if (idx == NULL)
return -ENOMEM;
for (i = 0; i < depmod->modules.count; i++) {
const struct mod *mod = depmod->modules.array[i];
struct kmod_list *l;
kmod_list_foreach(l, mod->info_list) {
const char *key = kmod_module_info_get_key(l);
const char *value = kmod_module_info_get_value(l);
char buf[PATH_MAX];
const char *alias;
int duplicate;
if (!streq(key, "alias"))
continue;
if (alias_normalize(value, buf, NULL) < 0) {
WRN("Unmatched bracket in %s\n", value);
continue;
}
alias = buf;
duplicate = index_insert(idx, alias, mod->modname,
mod->idx);
if (duplicate && depmod->cfg->warn_dups)
WRN("duplicate module alias:\n%s %s\n",
alias, mod->modname);
}
}
index_write(idx, out);
index_destroy(idx);
return 0;
}
static int output_softdeps(struct depmod *depmod, FILE *out)
{
size_t i;
fputs("# Soft dependencies extracted from modules themselves.\n", out);
for (i = 0; i < depmod->modules.count; i++) {
const struct mod *mod = depmod->modules.array[i];
struct kmod_list *l;
kmod_list_foreach(l, mod->info_list) {
const char *key = kmod_module_info_get_key(l);
const char *value = kmod_module_info_get_value(l);
if (!streq(key, "softdep"))
continue;
fprintf(out, "softdep %s %s\n", mod->modname, value);
}
}
return 0;
}
static int output_symbols(struct depmod *depmod, FILE *out)
{
struct hash_iter iter;
const void *v;
fputs("# Aliases for symbols, used by symbol_request().\n", out);
hash_iter_init(depmod->symbols, &iter);
while (hash_iter_next(&iter, NULL, &v)) {
const struct symbol *sym = v;
if (sym->owner == NULL)
continue;
fprintf(out, "alias symbol:%s %s\n",
sym->name, sym->owner->modname);
}
return 0;
}
static int output_symbols_bin(struct depmod *depmod, FILE *out)
{
struct index_node *idx;
char alias[1024];
_cleanup_(scratchbuf_release) struct scratchbuf salias =
SCRATCHBUF_INITIALIZER(alias);
size_t baselen = sizeof("symbol:") - 1;
struct hash_iter iter;
const void *v;
int ret = 0;
if (out == stdout)
return 0;
idx = index_create();
if (idx == NULL)
return -ENOMEM;
memcpy(alias, "symbol:", baselen);
hash_iter_init(depmod->symbols, &iter);
while (hash_iter_next(&iter, NULL, &v)) {
int duplicate;
const struct symbol *sym = v;
size_t len;
if (sym->owner == NULL)
continue;
len = strlen(sym->name);
if (scratchbuf_alloc(&salias, baselen + len + 1) < 0) {
ret = -ENOMEM;
goto err_scratchbuf;
}
memcpy(scratchbuf_str(&salias) + baselen, sym->name, len + 1);
duplicate = index_insert(idx, alias, sym->owner->modname,
sym->owner->idx);
if (duplicate && depmod->cfg->warn_dups)
WRN("duplicate module syms:\n%s %s\n",
alias, sym->owner->modname);
}
index_write(idx, out);
err_scratchbuf:
index_destroy(idx);
if (ret < 0)
ERR("output symbols: %s\n", strerror(-ret));
return ret;
}
static int output_builtin_bin(struct depmod *depmod, FILE *out)
{
FILE *in;
struct index_node *idx;
char line[PATH_MAX], modname[PATH_MAX];
if (out == stdout)
return 0;
in = dfdopen(depmod->cfg->dirname, "modules.builtin", O_RDONLY, "r");
if (in == NULL)
return 0;
idx = index_create();
if (idx == NULL) {
fclose(in);
return -ENOMEM;
}
while (fgets(line, sizeof(line), in) != NULL) {
if (!isalpha(line[0])) {
ERR("Invalid modules.builtin line: %s\n", line);
continue;
}
path_to_modname(line, modname, NULL);
index_insert(idx, modname, "", 0);
}
index_write(idx, out);
index_destroy(idx);
fclose(in);
return 0;
}
static int flush_stream(FILE *in, int endchar)
{
size_t i = 0;
int c;
for (c = fgetc(in);
c != EOF && c != endchar && c != '\0';
c = fgetc(in))
;
return c == endchar ? i : 0;
}
static int flush_stream_to(FILE *in, int endchar, char *dst, size_t dst_sz)
{
size_t i = 0;
int c;
for (c = fgetc(in);
c != EOF && c != endchar && c != '\0' && i < dst_sz;
c = fgetc(in))
dst[i++] = c;
if (i == dst_sz) {
WRN("Could not flush stream: %d. Partial content: %.*s\n",
ENOSPC, (int) dst_sz, dst);
i--;
}
return c == endchar ? i : 0;
}
static int output_builtin_alias_bin(struct depmod *depmod, FILE *out)
{
FILE *in;
struct index_node *idx;
int ret;
if (out == stdout)
return 0;
in = dfdopen(depmod->cfg->dirname, "modules.builtin.modinfo", O_RDONLY, "r");
if (in == NULL)
return 0;
idx = index_create();
if (idx == NULL) {
fclose(in);
return -ENOMEM;
}
/* format: modname.key=value\0 */
while (!feof(in) && !ferror(in)) {
char alias[PATH_MAX];
char modname[PATH_MAX];
char value[PATH_MAX];
size_t len;
len = flush_stream_to(in, '.', modname, sizeof(modname));
modname[len] = '\0';
if (!len)
continue;
len = flush_stream_to(in, '=', value, sizeof(value));
value[len] = '\0';
if (!streq(value, "alias")) {
flush_stream(in, '\0');
continue;
}
len = flush_stream_to(in, '\0', value, sizeof(value));
value[len] = '\0';
if (!len)
continue;
alias[0] = '\0';
if (alias_normalize(value, alias, NULL) < 0) {
WRN("Unmatched bracket in %s\n", value);
continue;
}
index_insert(idx, alias, modname, 0);
}
if (ferror(in)) {
ret = -EINVAL;
} else {
index_write(idx, out);
ret = 0;
}
index_destroy(idx);
fclose(in);
return ret;
}
static int output_devname(struct depmod *depmod, FILE *out)
{
size_t i;
bool empty = true;
for (i = 0; i < depmod->modules.count; i++) {
const struct mod *mod = depmod->modules.array[i];
struct kmod_list *l;
const char *devname = NULL;
char type = '\0';
unsigned int major = 0, minor = 0;
kmod_list_foreach(l, mod->info_list) {
const char *key = kmod_module_info_get_key(l);
const char *value = kmod_module_info_get_value(l);
unsigned int maj, min;
if (!streq(key, "alias"))
continue;
if (strstartswith(value, "devname:"))
devname = value + sizeof("devname:") - 1;
else if (sscanf(value, "char-major-%u-%u",
&maj, &min) == 2) {
type = 'c';
major = maj;
minor = min;
} else if (sscanf(value, "block-major-%u-%u",
&maj, &min) == 2) {
type = 'b';
major = maj;
minor = min;
}
if (type != '\0' && devname != NULL)
break;
}
if (devname != NULL) {
if (type != '\0') {
if (empty) {
fputs("# Device nodes to trigger on-demand module loading.\n",
out);
empty = false;
}
fprintf(out, "%s %s %c%u:%u\n", mod->modname,
devname, type, major, minor);
} else
ERR("Module '%s' has devname (%s) but "
"lacks major and minor information. "
"Ignoring.\n", mod->modname, devname);
}
}
return 0;
}
static int depmod_output(struct depmod *depmod, FILE *out)
{
static const struct depfile {
const char *name;
int (*cb)(struct depmod *depmod, FILE *out);
} *itr, depfiles[] = {
{ "modules.dep", output_deps },
{ "modules.dep.bin", output_deps_bin },
{ "modules.alias", output_aliases },
{ "modules.alias.bin", output_aliases_bin },
{ "modules.softdep", output_softdeps },
{ "modules.symbols", output_symbols },
{ "modules.symbols.bin", output_symbols_bin },
{ "modules.builtin.bin", output_builtin_bin },
{ "modules.builtin.alias.bin", output_builtin_alias_bin },
{ "modules.devname", output_devname },
{ }
};
const char *dname = depmod->cfg->outdirname;
int dfd, err = 0;
struct timeval tv;
gettimeofday(&tv, NULL);
if (out != NULL)
dfd = -1;
else {
err = mkdir_p(dname, strlen(dname), 0755);
if (err < 0) {
CRIT("could not create directory %s: %m\n", dname);
return err;
}
dfd = open(dname, O_RDONLY);
if (dfd < 0) {
err = -errno;
CRIT("could not open directory %s: %m\n", dname);
return err;
}
}
for (itr = depfiles; itr->name != NULL; itr++) {
FILE *fp = out;
char tmp[NAME_MAX] = "";
int r, ferr;
if (fp == NULL) {
int flags = O_CREAT | O_EXCL | O_WRONLY;
int mode = 0644;
int fd;
snprintf(tmp, sizeof(tmp), "%s.%i.%li.%li", itr->name, getpid(),
tv.tv_usec, tv.tv_sec);
fd = openat(dfd, tmp, flags, mode);
if (fd < 0) {
ERR("openat(%s, %s, %o, %o): %m\n",
dname, tmp, flags, mode);
continue;
}
fp = fdopen(fd, "wb");
if (fp == NULL) {
ERR("fdopen(%d=%s/%s): %m\n", fd, dname, tmp);
close(fd);
continue;
}
}
r = itr->cb(depmod, fp);
if (fp == out)
continue;
ferr = ferror(fp) | fclose(fp);
if (r < 0) {
if (unlinkat(dfd, tmp, 0) != 0)
ERR("unlinkat(%s, %s): %m\n", dname, tmp);
ERR("Could not write index '%s': %s\n", itr->name,
strerror(-r));
err = -errno;
break;
}
if (renameat(dfd, tmp, dfd, itr->name) != 0) {
err = -errno;
CRIT("renameat(%s, %s, %s, %s): %m\n",
dname, tmp, dname, itr->name);
break;
}
if (ferr) {
err = -ENOSPC;
ERR("Could not create index '%s'. Output is truncated: %s\n",
itr->name, strerror(-err));
break;
}
}
if (dfd >= 0)
close(dfd);
return err;
}
static void depmod_add_fake_syms(struct depmod *depmod)
{
/* __this_module is magic inserted by kernel loader. */
depmod_symbol_add(depmod, "__this_module", true, 0, NULL);
/* On S390, this is faked up too */
depmod_symbol_add(depmod, "_GLOBAL_OFFSET_TABLE_", true, 0, NULL);
/* On PowerPC64 ABIv2, .TOC. is more or less _GLOBAL_OFFSET_TABLE_ */
if (!depmod_symbol_find(depmod, "TOC."))
depmod_symbol_add(depmod, "TOC.", true, 0, NULL);
}
static int depmod_load_symvers(struct depmod *depmod, const char *filename)
{
char line[10240];
FILE *fp;
unsigned int linenum = 0;
fp = fopen(filename, "r");
if (fp == NULL) {
int err = -errno;
DBG("load symvers: %s: %m\n", filename);
return err;
}
DBG("load symvers: %s\n", filename);
/* eg. "0xb352177e\tfind_first_bit\tvmlinux\tEXPORT_SYMBOL" */
while (fgets(line, sizeof(line), fp) != NULL) {
const char *ver, *sym, *where;
char *verend;
uint64_t crc;
linenum++;
ver = strtok(line, " \t");
sym = strtok(NULL, " \t");
where = strtok(NULL, " \t");
if (!ver || !sym || !where)
continue;
if (!streq(where, "vmlinux"))
continue;
crc = strtoull(ver, &verend, 16);
if (verend[0] != '\0') {
ERR("%s:%u Invalid symbol version %s: %m\n",
filename, linenum, ver);
continue;
}
depmod_symbol_add(depmod, sym, false, crc, NULL);
}
depmod_add_fake_syms(depmod);
DBG("loaded symvers: %s\n", filename);
fclose(fp);
return 0;
}
static int depmod_load_system_map(struct depmod *depmod, const char *filename)
{
const char ksymstr[] = "__ksymtab_";
const size_t ksymstr_len = sizeof(ksymstr) - 1;
char line[10240];
FILE *fp;
unsigned int linenum = 0;
fp = fopen(filename, "r");
if (fp == NULL) {
int err = -errno;
DBG("load System.map: %s: %m\n", filename);
return err;
}
DBG("load System.map: %s\n", filename);
/* eg. c0294200 R __ksymtab_devfs_alloc_devnum */
while (fgets(line, sizeof(line), fp) != NULL) {
char *p, *end;
linenum++;
p = strchr(line, ' ');
if (p == NULL)
goto invalid_syntax;
p++;
p = strchr(p, ' ');
if (p == NULL)
goto invalid_syntax;
p++;
/* skip prefix */
if (p[0] == depmod->cfg->sym_prefix)
p++;
/* Covers gpl-only and normal symbols. */
if (strncmp(p, ksymstr, ksymstr_len) != 0)
continue;
end = strchr(p, '\n');
if (end != NULL)
*end = '\0';
depmod_symbol_add(depmod, p + ksymstr_len, true, 0, NULL);
continue;
invalid_syntax:
ERR("%s:%u: invalid line: %s\n", filename, linenum, line);
}
depmod_add_fake_syms(depmod);
DBG("loaded System.map: %s\n", filename);
fclose(fp);
return 0;
}
static int depfile_up_to_date_dir(DIR *d, time_t mtime, size_t baselen, char *path)
{
struct dirent *de;
int err = 1, dfd = dirfd(d);
while ((de = readdir(d)) != NULL) {
const char *name = de->d_name;
size_t namelen;
struct stat st;
if (name[0] == '.' && (name[1] == '\0' ||
(name[1] == '.' && name[2] == '\0')))
continue;
if (streq(name, "build") || streq(name, "source"))
continue;
namelen = strlen(name);
if (baselen + namelen + 2 >= PATH_MAX) {
path[baselen] = '\0';
ERR("path is too long %s%s\n", path, name);
continue;
}
if (fstatat(dfd, name, &st, 0) < 0) {
ERR("fstatat(%d, %s): %m\n", dfd, name);
continue;
}
if (S_ISDIR(st.st_mode)) {
int fd;
DIR *subdir;
memcpy(path + baselen, name, namelen + 1);
if (baselen + namelen + 2 + NAME_MAX >= PATH_MAX) {
ERR("directory path is too long %s\n", path);
continue;
}
fd = openat(dfd, name, O_RDONLY);
if (fd < 0) {
ERR("openat(%d, %s, O_RDONLY): %m\n",
dfd, name);
continue;
}
subdir = fdopendir(fd);
if (subdir == NULL) {
ERR("fdopendir(%d): %m\n", fd);
close(fd);
continue;
}
path[baselen + namelen] = '/';
path[baselen + namelen + 1] = '\0';
err = depfile_up_to_date_dir(subdir, mtime,
baselen + namelen + 1,
path);
closedir(subdir);
} else if (S_ISREG(st.st_mode)) {
if (!path_ends_with_kmod_ext(name, namelen))
continue;
memcpy(path + baselen, name, namelen + 1);
err = st.st_mtime <= mtime;
if (err == 0) {
DBG("%s %"PRIu64" is newer than %"PRIu64"\n",
path, (uint64_t)st.st_mtime,
(uint64_t)mtime);
}
} else {
ERR("unsupported file type %s: %o\n",
path, st.st_mode & S_IFMT);
continue;
}
if (err == 0)
break; /* outdated! */
else if (err < 0) {
path[baselen + namelen] = '\0';
ERR("failed %s: %s\n", path, strerror(-err));
err = 1; /* ignore errors */
}
}
return err;
}
/* uptodate: 1, outdated: 0, errors < 0 */
static int depfile_up_to_date(const char *dirname)
{
char path[PATH_MAX];
DIR *d = opendir(dirname);
struct stat st;
size_t baselen;
int err;
if (d == NULL) {
err = -errno;
ERR("could not open directory %s: %m\n", dirname);
return err;
}
if (fstatat(dirfd(d), "modules.dep", &st, 0) != 0) {
err = -errno;
ERR("could not fstatat(%s, modules.dep): %m\n", dirname);
closedir(d);
return err;
}
baselen = strlen(dirname);
memcpy(path, dirname, baselen);
path[baselen] = '/';
baselen++;
path[baselen] = '\0';
err = depfile_up_to_date_dir(d, st.st_mtime, baselen, path);
closedir(d);
return err;
}
static int is_version_number(const char *version)
{
unsigned int d1, d2;
return (sscanf(version, "%u.%u", &d1, &d2) == 2);
}
static int do_depmod(int argc, char *argv[])
{
FILE *out = NULL;
int err = 0, all = 0, maybe_all = 0, n_config_paths = 0;
_cleanup_free_ char *root = NULL;
_cleanup_free_ char *out_root = NULL;
_cleanup_free_ const char **config_paths = NULL;
const char *system_map = NULL;
const char *module_symvers = NULL;
const char *null_kmod_config = NULL;
struct utsname un;
struct kmod_ctx *ctx = NULL;
struct cfg cfg;
struct depmod depmod;
memset(&cfg, 0, sizeof(cfg));
memset(&depmod, 0, sizeof(depmod));
for (;;) {
int c, idx = 0;
c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
if (c == -1)
break;
switch (c) {
case 'a':
all = 1;
break;
case 'A':
maybe_all = 1;
break;
case 'b':
if (root)
free(root);
root = path_make_absolute_cwd(optarg);
break;
case 'o':
if (out_root)
free(out_root);
out_root = path_make_absolute_cwd(optarg);
break;
case 'C': {
size_t bytes = sizeof(char *) * (n_config_paths + 2);
void *tmp = realloc(config_paths, bytes);
if (!tmp) {
fputs("Error: out-of-memory\n", stderr);
goto cmdline_failed;
}
config_paths = tmp;
config_paths[n_config_paths] = optarg;
n_config_paths++;
config_paths[n_config_paths] = NULL;
break;
}
case 'E':
module_symvers = optarg;
cfg.check_symvers = 1;
break;
case 'F':
system_map = optarg;
break;
case 'e':
cfg.print_unknown = 1;
break;
case 'v':
verbose++;
break;
case 'n':
out = stdout;
break;
case 'P':
if (optarg[1] != '\0') {
CRIT("-P only takes a single char\n");
goto cmdline_failed;
}
cfg.sym_prefix = optarg[0];
break;
case 'w':
cfg.warn_dups = 1;
break;
case 'u':
case 'q':
case 'r':
case 'm':
if (idx > 0)
WRN("Ignored deprecated option --%s\n",
cmdopts[idx].name);
else
WRN("Ignored deprecated option -%c\n", c);
break;
case 'h':
help();
return EXIT_SUCCESS;
case 'V':
puts(PACKAGE " version " VERSION);
puts(KMOD_FEATURES);
return EXIT_SUCCESS;
case '?':
goto cmdline_failed;
default:
ERR("unexpected getopt_long() value '%c'.\n", c);
goto cmdline_failed;
}
}
if (optind < argc) {
if (!is_version_number(argv[optind])) {
ERR("Bad version passed %s\n", argv[optind]);
goto cmdline_failed;
}
cfg.kversion = argv[optind];
optind++;
} else {
if (uname(&un) < 0) {
CRIT("uname() failed: %s\n", strerror(errno));
goto cmdline_failed;
}
cfg.kversion = un.release;
}
cfg.dirnamelen = snprintf(cfg.dirname, PATH_MAX,
"%s" MODULE_DIRECTORY "/%s",
root ?: "", cfg.kversion);
cfg.outdirnamelen = snprintf(cfg.outdirname, PATH_MAX,
"%s" MODULE_DIRECTORY "/%s",
out_root ?: (root ?: ""), cfg.kversion);
if (optind == argc)
all = 1;
if (maybe_all) {
if (out == stdout)
goto done;
/* ignore up-to-date errors (< 0) */
if (depfile_up_to_date(cfg.dirname) == 1)
goto done;
all = 1;
}
ctx = kmod_new(cfg.dirname, &null_kmod_config);
if (ctx == NULL) {
CRIT("kmod_new(\"%s\", {NULL}) failed: %m\n", cfg.dirname);
goto cmdline_failed;
}
log_setup_kmod_log(ctx, verbose);
err = depmod_init(&depmod, &cfg, ctx);
if (err < 0) {
CRIT("depmod_init: %s\n", strerror(-err));
goto depmod_init_failed;
}
ctx = NULL; /* owned by depmod */
if (module_symvers != NULL) {
err = depmod_load_symvers(&depmod, module_symvers);
if (err < 0) {
CRIT("could not load %s: %s\n", module_symvers,
strerror(-err));
goto cmdline_failed;
}
} else if (system_map != NULL) {
err = depmod_load_system_map(&depmod, system_map);
if (err < 0) {
CRIT("could not load %s: %s\n", system_map,
strerror(-err));
goto cmdline_failed;
}
} else if (cfg.print_unknown) {
WRN("-e needs -E or -F\n");
cfg.print_unknown = 0;
}
if (all) {
err = cfg_load(&cfg, config_paths);
if (err < 0) {
CRIT("could not load configuration files\n");
goto cmdline_modules_failed;
}
err = depmod_modules_search(&depmod);
if (err < 0) {
CRIT("could not search modules: %s\n", strerror(-err));
goto cmdline_modules_failed;
}
} else {
int i;
for (i = optind; i < argc; i++) {
const char *path = argv[i];
struct kmod_module *mod;
if (path[0] != '/') {
CRIT("%s: not absolute path.\n", path);
goto cmdline_modules_failed;
}
err = kmod_module_new_from_path(depmod.ctx, path, &mod);
if (err < 0) {
CRIT("could not create module %s: %s\n",
path, strerror(-err));
goto cmdline_modules_failed;
}
err = depmod_module_add(&depmod, mod);
if (err < 0) {
CRIT("could not add module %s: %s\n",
path, strerror(-err));
kmod_module_unref(mod);
goto cmdline_modules_failed;
}
}
}
err = depmod_modules_build_array(&depmod);
if (err < 0) {
CRIT("could not build module array: %s\n",
strerror(-err));
goto cmdline_modules_failed;
}
depmod_modules_sort(&depmod);
err = depmod_load(&depmod);
if (err < 0)
goto cmdline_modules_failed;
err = depmod_output(&depmod, out);
done:
depmod_shutdown(&depmod);
cfg_free(&cfg);
return err >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
cmdline_modules_failed:
depmod_shutdown(&depmod);
depmod_init_failed:
if (ctx != NULL)
kmod_unref(ctx);
cmdline_failed:
cfg_free(&cfg);
return EXIT_FAILURE;
}
const struct kmod_cmd kmod_cmd_compat_depmod = {
.name = "depmod",
.cmd = do_depmod,
.help = "compat depmod command",
};
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