#include <stddef.h>

#include <limits.h>

#include <stdlib.h>

#include <stdbool.h>

#include <string.h>

#include <stdio.h>

#include <fcntl.h>

#include <ctype.h>

#include <unistd.h>

#include <errno.h>

#include <dirent.h>

#include <fnmatch.h>

#include <time.h>

#include "udev.h"

#define PREALLOC_TOKEN 2048

#define PREALLOC_STRBUF 32 * 1024

#define PREALLOC_TRIE 256

struct uid_gid {

unsigned int name_off;

union {

uid_t uid;

gid_t gid;

};

};

struct trie_node {

/* this node's first child */

unsigned int child_idx;

/* the next child of our parent node's child list */

unsigned int next_child_idx;

/* this node's last child (shortcut for append) */

unsigned int last_child_idx;

unsigned int value_off;

unsigned short value_len;

unsigned char key;

};

struct udev_rules {

struct udev *udev;

int resolve_names;

/* every key in the rules file becomes a token */

struct token *tokens;

unsigned int token_cur;

unsigned int token_max;

/* all key strings are copied to a single string buffer */

char *buf;

size_t buf_cur;

size_t buf_max;

unsigned int buf_count;

/* during rule parsing, strings are indexed to find duplicates */

struct trie_node *trie_nodes;

unsigned int trie_nodes_cur;

unsigned int trie_nodes_max;

/* during rule parsing, uid/gid lookup results are cached */

struct uid_gid *uids;

unsigned int uids_cur;

unsigned int uids_max;

struct uid_gid *gids;

unsigned int gids_cur;

unsigned int gids_max;

};

enum operation_type {

OP_UNSET,

OP_MATCH,

OP_NOMATCH,

OP_MATCH_MAX,

OP_ADD,

OP_ASSIGN,

OP_ASSIGN_FINAL,

};

enum string_glob_type {

GL_UNSET,

GL_PLAIN, /* no special chars */

GL_GLOB, /* shell globs ?,*,[] */

GL_SPLIT, /* multi-value A|B */

GL_SPLIT_GLOB, /* multi-value with glob A*|B* */

GL_SOMETHING, /* commonly used "?*" */

};

enum string_subst_type {

SB_UNSET,

SB_NONE,

SB_FORMAT,

SB_SUBSYS,

};

enum token_type {

TK_UNSET,

TK_RULE,

TK_M_ACTION, /* val */

TK_M_DEVPATH, /* val */

TK_M_KERNEL, /* val */

TK_M_DEVLINK, /* val */

TK_M_NAME, /* val */

TK_M_ENV, /* val, attr */

TK_M_TAG, /* val */

TK_M_SUBSYSTEM, /* val */

TK_M_DRIVER, /* val */

TK_M_WAITFOR, /* val */

TK_M_ATTR, /* val, attr */

TK_M_PARENTS_MIN,

TK_M_KERNELS, /* val */

TK_M_SUBSYSTEMS, /* val */

TK_M_DRIVERS, /* val */

TK_M_ATTRS, /* val, attr */

TK_M_PARENTS_MAX,

TK_M_TEST, /* val, mode_t */

TK_M_PROGRAM, /* val */

TK_M_IMPORT_FILE, /* val */

TK_M_IMPORT_PROG, /* val */

TK_M_IMPORT_DB, /* val */

TK_M_IMPORT_PARENT, /* val */

TK_M_RESULT, /* val */

TK_M_MAX,

TK_A_STRING_ESCAPE_NONE,

TK_A_STRING_ESCAPE_REPLACE,

TK_A_INOTIFY_WATCH, /* int */

TK_A_DEVLINK_PRIO, /* int */

TK_A_OWNER, /* val */

TK_A_GROUP, /* val */

TK_A_MODE, /* val */

TK_A_OWNER_ID, /* uid_t */

TK_A_GROUP_ID, /* gid_t */

TK_A_MODE_ID, /* mode_t */

TK_A_ENV, /* val, attr */

TK_A_TAG, /* val */

TK_A_NAME, /* val */

TK_A_DEVLINK, /* val */

TK_A_EVENT_TIMEOUT, /* int */

TK_A_ATTR, /* val, attr */

TK_A_RUN, /* val, bool */

TK_A_GOTO, /* size_t */

TK_END,

};

struct token {

union {

unsigned char type; /* same as in rule and key */

struct {

enum token_type type:8;

unsigned int flags:8;

unsigned short token_count;

unsigned int label_off;

unsigned short filename_off;

unsigned short filename_line;

} rule;

struct {

enum token_type type:8;

enum operation_type op:8;

enum string_glob_type glob:8;

enum string_subst_type subst:4;

enum string_subst_type attrsubst:4;

unsigned int value_off;

union {

unsigned int attr_off;

int devlink_unique;

int fail_on_error;

unsigned int rule_goto;

mode_t mode;

uid_t uid;

gid_t gid;

int devlink_prio;

int event_timeout;

int watch;

};

} key;

};

};

#define MAX_TK 64

struct rule_tmp {

struct udev_rules *rules;

struct token rule;

struct token token[MAX_TK];

unsigned int token_cur;

};

#ifdef ENABLE_DEBUG

static const char *operation_str(enum operation_type type)

{

static const char *operation_strs[] = {

[OP_UNSET] = "UNSET",

[OP_MATCH] = "match",

[OP_NOMATCH] = "nomatch",

[OP_MATCH_MAX] = "MATCH_MAX",

[OP_ADD] = "add",

[OP_ASSIGN] = "assign",

[OP_ASSIGN_FINAL] = "assign-final",

} ;

return operation_strs[type];

}

static const char *string_glob_str(enum string_glob_type type)

{

static const char *string_glob_strs[] = {

[GL_UNSET] = "UNSET",

[GL_PLAIN] = "plain",

[GL_GLOB] = "glob",

[GL_SPLIT] = "split",

[GL_SPLIT_GLOB] = "split-glob",

[GL_SOMETHING] = "split-glob",

};

return string_glob_strs[type];

}

static const char *token_str(enum token_type type)

{

static const char *token_strs[] = {

[TK_UNSET] = "UNSET",

[TK_RULE] = "RULE",

[TK_M_ACTION] = "M ACTION",

[TK_M_DEVPATH] = "M DEVPATH",

[TK_M_KERNEL] = "M KERNEL",

[TK_M_DEVLINK] = "M DEVLINK",

[TK_M_NAME] = "M NAME",

[TK_M_ENV] = "M ENV",

[TK_M_TAG] = "M TAG",

[TK_M_SUBSYSTEM] = "M SUBSYSTEM",

[TK_M_DRIVER] = "M DRIVER",

[TK_M_WAITFOR] = "M WAITFOR",

[TK_M_ATTR] = "M ATTR",

[TK_M_PARENTS_MIN] = "M PARENTS_MIN",

[TK_M_KERNELS] = "M KERNELS",

[TK_M_SUBSYSTEMS] = "M SUBSYSTEMS",

[TK_M_DRIVERS] = "M DRIVERS",

[TK_M_ATTRS] = "M ATTRS",

[TK_M_PARENTS_MAX] = "M PARENTS_MAX",

[TK_M_TEST] = "M TEST",

[TK_M_PROGRAM] = "M PROGRAM",

[TK_M_IMPORT_FILE] = "M IMPORT_FILE",

[TK_M_IMPORT_PROG] = "M IMPORT_PROG",

[TK_M_IMPORT_DB] = "M IMPORT_DB",

[TK_M_IMPORT_PARENT] = "M IMPORT_PARENT",

[TK_M_RESULT] = "M RESULT",

[TK_M_MAX] = "M MAX",

[TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",

[TK_A_STRING_ESCAPE_REPLACE] = "A STRING_ESCAPE_REPLACE",

[TK_A_INOTIFY_WATCH] = "A INOTIFY_WATCH",

[TK_A_DEVLINK_PRIO] = "A DEVLINK_PRIO",

[TK_A_OWNER] = "A OWNER",

[TK_A_GROUP] = "A GROUP",

[TK_A_MODE] = "A MODE",

[TK_A_OWNER_ID] = "A OWNER_ID",

[TK_A_GROUP_ID] = "A GROUP_ID",

[TK_A_MODE_ID] = "A MODE_ID",

[TK_A_ENV] = "A ENV",

[TK_A_TAG] = "A ENV",

[TK_A_NAME] = "A NAME",

[TK_A_DEVLINK] = "A DEVLINK",

[TK_A_EVENT_TIMEOUT] = "A EVENT_TIMEOUT",

[TK_A_ATTR] = "A ATTR",

[TK_A_RUN] = "A RUN",

[TK_A_GOTO] = "A GOTO",

[TK_END] = "END",

};

return token_strs[type];

}

static void dump_token(struct udev_rules *rules, struct token *token)

{

enum token_type type = token->type;

enum operation_type op = token->key.op;

enum string_glob_type glob = token->key.glob;

const char *value = &rules->buf[token->key.value_off];

const char *attr = &rules->buf[token->key.attr_off];

switch (type) {

case TK_RULE:

{

const char *tks_ptr = (char *)rules->tokens;

const char *tk_ptr = (char *)token;

unsigned int idx = (tk_ptr - tks_ptr) / sizeof(struct token);

dbg(rules->udev, "* RULE %s:%u, token: %u, count: %u, label: '%s', flags: 0x%02x\n",

&rules->buf[token->rule.filename_off], token->rule.filename_line,

idx, token->rule.token_count,

&rules->buf[token->rule.label_off],

token->rule.flags);

break;

}

case TK_M_ACTION:

case TK_M_DEVPATH:

case TK_M_KERNEL:

case TK_M_SUBSYSTEM:

case TK_M_DRIVER:

case TK_M_WAITFOR:

case TK_M_DEVLINK:

case TK_M_NAME:

case TK_M_KERNELS:

case TK_M_SUBSYSTEMS:

case TK_M_DRIVERS:

case TK_M_PROGRAM:

case TK_M_IMPORT_FILE:

case TK_M_IMPORT_PROG:

case TK_M_IMPORT_DB:

case TK_M_IMPORT_PARENT:

case TK_M_RESULT:

case TK_A_NAME:

case TK_A_DEVLINK:

case TK_A_OWNER:

case TK_A_GROUP:

case TK_A_MODE:

case TK_A_RUN:

dbg(rules->udev, "%s %s '%s'(%s)\n",

token_str(type), operation_str(op), value, string_glob_str(glob));

break;

case TK_M_ATTR:

case TK_M_ATTRS:

case TK_M_ENV:

case TK_A_ATTR:

case TK_A_ENV:

dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",

token_str(type), operation_str(op), attr, value, string_glob_str(glob));

break;

case TK_M_TAG:

case TK_A_TAG:

dbg(rules->udev, "%s %s '%s'\n", token_str(type), operation_str(op), value);

break;

case TK_A_STRING_ESCAPE_NONE:

case TK_A_STRING_ESCAPE_REPLACE:

dbg(rules->udev, "%s\n", token_str(type));

break;

case TK_M_TEST:

dbg(rules->udev, "%s %s '%s'(%s) %#o\n",

token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);

break;

case TK_A_INOTIFY_WATCH:

dbg(rules->udev, "%s %u\n", token_str(type), token->key.watch);

break;

case TK_A_DEVLINK_PRIO:

dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.devlink_prio);

break;

case TK_A_OWNER_ID:

dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.uid);

break;

case TK_A_GROUP_ID:

dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.gid);

break;

case TK_A_MODE_ID:

dbg(rules->udev, "%s %s %#o\n", token_str(type), operation_str(op), token->key.mode);

break;

case TK_A_EVENT_TIMEOUT:

dbg(rules->udev, "%s %s %u\n", token_str(type), operation_str(op), token->key.event_timeout);

break;

case TK_A_GOTO:

dbg(rules->udev, "%s '%s' %u\n", token_str(type), value, token->key.rule_goto);

break;

case TK_END:

dbg(rules->udev, "* %s\n", token_str(type));

break;

case TK_M_PARENTS_MIN:

case TK_M_PARENTS_MAX:

case TK_M_MAX:

case TK_UNSET:

dbg(rules->udev, "unknown type %u\n", type);

break;

}

}

static void dump_rules(struct udev_rules *rules)

{

unsigned int i;

dbg(rules->udev, "dumping %u (%zu bytes) tokens, %u (%zu bytes) strings\n",

rules->token_cur,

rules->token_cur * sizeof(struct token),

rules->buf_count,

rules->buf_cur);

for(i = 0; i < rules->token_cur; i++)

dump_token(rules, &rules->tokens[i]);

}

#else

static inline const char *operation_str(enum operation_type type) { return NULL; }

static inline const char *token_str(enum token_type type) { return NULL; }

static inline void dump_token(struct udev_rules *rules, struct token *token) {}

static inline void dump_rules(struct udev_rules *rules) {}

#endif /* ENABLE_DEBUG */

static int add_new_string(struct udev_rules *rules, const char *str, size_t bytes)

{

int off;

/* grow buffer if needed */

if (rules->buf_cur + bytes+1 >= rules->buf_max) {

char *buf;

unsigned int add;

/* double the buffer size */

add = rules->buf_max;

if (add < bytes * 8)

add = bytes * 8;

buf = realloc(rules->buf, rules->buf_max + add);

if (buf == NULL)

return -1;

dbg(rules->udev, "extend buffer from %zu to %zu\n", rules->buf_max, rules->buf_max + add);

rules->buf = buf;

rules->buf_max += add;

}

off = rules->buf_cur;

memcpy(&rules->buf[rules->buf_cur], str, bytes);

rules->buf_cur += bytes;

rules->buf_count++;

return off;

}

static int add_string(struct udev_rules *rules, const char *str)

{

unsigned int node_idx;

struct trie_node *new_node;

unsigned int new_node_idx;

unsigned char key;

unsigned short len;

unsigned int depth;

unsigned int off;

struct trie_node *parent;

/* walk trie, start from last character of str to find matching tails */

len = strlen(str);

key = str[len-1];

node_idx = 0;

for (depth = 0; depth <= len; depth++) {

struct trie_node *node;

unsigned int child_idx;

node = &rules->trie_nodes[node_idx];

off = node->value_off + node->value_len - len;

/* match against current node */

if (depth == len || (node->value_len >= len && memcmp(&rules->buf[off], str, len) == 0))

return off;

/* lookup child node */

key = str[len - 1 - depth];

child_idx = node->child_idx;

while (child_idx > 0) {

struct trie_node *child;

child = &rules->trie_nodes[child_idx];

if (child->key == key)

break;

child_idx = child->next_child_idx;

}

if (child_idx == 0)

break;

node_idx = child_idx;

}

/* string not found, add it */

off = add_new_string(rules, str, len + 1);

/* grow trie nodes if needed */

if (rules->trie_nodes_cur >= rules->trie_nodes_max) {

struct trie_node *nodes;

unsigned int add;

/* double the buffer size */

add = rules->trie_nodes_max;

if (add < 8)

add = 8;

nodes = realloc(rules->trie_nodes, (rules->trie_nodes_max + add) * sizeof(struct trie_node));

if (nodes == NULL)

return -1;

dbg(rules->udev, "extend trie nodes from %u to %u\n",

rules->trie_nodes_max, rules->trie_nodes_max + add);

rules->trie_nodes = nodes;

rules->trie_nodes_max += add;

}

/* get a new node */

new_node_idx = rules->trie_nodes_cur;

rules->trie_nodes_cur++;

new_node = &rules->trie_nodes[new_node_idx];

memset(new_node, 0x00, sizeof(struct trie_node));

new_node->value_off = off;

new_node->value_len = len;

new_node->key = key;

/* join the parent's child list */

parent = &rules->trie_nodes[node_idx];

if (parent->child_idx == 0) {

parent->child_idx = new_node_idx;

} else {

struct trie_node *last_child;

last_child = &rules->trie_nodes[parent->last_child_idx];

last_child->next_child_idx = new_node_idx;

}

parent->last_child_idx = new_node_idx;

return off;

}

static int add_token(struct udev_rules *rules, struct token *token)

{

/* grow buffer if needed */

if (rules->token_cur+1 >= rules->token_max) {

struct token *tokens;

unsigned int add;

/* double the buffer size */

add = rules->token_max;

if (add < 8)

add = 8;

tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));

if (tokens == NULL)

return -1;

dbg(rules->udev, "extend tokens from %u to %u\n", rules->token_max, rules->token_max + add);

rules->tokens = tokens;

rules->token_max += add;

}

memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));

rules->token_cur++;

return 0;

}

static uid_t add_uid(struct udev_rules *rules, const char *owner)

{

unsigned int i;

uid_t uid;

unsigned int off;

/* lookup, if we know it already */

for (i = 0; i < rules->uids_cur; i++) {

off = rules->uids[i].name_off;

if (strcmp(&rules->buf[off], owner) == 0) {

uid = rules->uids[i].uid;

dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);

return uid;

}

}

uid = util_lookup_user(rules->udev, owner);

/* grow buffer if needed */

if (rules->uids_cur+1 >= rules->uids_max) {

struct uid_gid *uids;

unsigned int add;

/* double the buffer size */

add = rules->uids_max;

if (add < 1)

add = 8;

uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));

if (uids == NULL)

return uid;

dbg(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);

rules->uids = uids;

rules->uids_max += add;

}

rules->uids[rules->uids_cur].uid = uid;

off = add_string(rules, owner);

if (off <= 0)

return uid;

rules->uids[rules->uids_cur].name_off = off;

rules->uids_cur++;

return uid;

}

static gid_t add_gid(struct udev_rules *rules, const char *group)

{

unsigned int i;

gid_t gid;

unsigned int off;

/* lookup, if we know it already */

for (i = 0; i < rules->gids_cur; i++) {

off = rules->gids[i].name_off;

if (strcmp(&rules->buf[off], group) == 0) {

gid = rules->gids[i].gid;

dbg(rules->udev, "return existing %u for '%s'\n", gid, group);

return gid;

}

}

gid = util_lookup_group(rules->udev, group);

/* grow buffer if needed */

if (rules->gids_cur+1 >= rules->gids_max) {

struct uid_gid *gids;

unsigned int add;

/* double the buffer size */

add = rules->gids_max;

if (add < 1)

add = 8;

gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));

if (gids == NULL)

return gid;

dbg(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);

rules->gids = gids;

rules->gids_max += add;

}

rules->gids[rules->gids_cur].gid = gid;

off = add_string(rules, group);

if (off <= 0)

return gid;

rules->gids[rules->gids_cur].name_off = off;

rules->gids_cur++;

return gid;

}

static int import_property_from_string(struct udev_device *dev, char *line)

{

struct udev *udev = udev_device_get_udev(dev);

char *key;

char *val;

size_t len;

/* find key */

key = line;

while (isspace(key[0]))

key++;

/* comment or empty line */

if (key[0] == '#' || key[0] == '\0')

return -1;

/* split key/value */

val = strchr(key, '=');

if (val == NULL)

return -1;

val[0] = '\0';

val++;

/* find value */

while (isspace(val[0]))

val++;

/* terminate key */

len = strlen(key);

if (len == 0)

return -1;

while (isspace(key[len-1]))

len--;

key[len] = '\0';

/* terminate value */

len = strlen(val);

if (len == 0)

return -1;

while (isspace(val[len-1]))

len--;

val[len] = '\0';

if (len == 0)

return -1;

/* unquote */

if (val[0] == '"' || val[0] == '\'') {

if (val[len-1] != val[0]) {

info(udev, "inconsistent quoting: '%s', skip\n", line);

return -1;

}

val[len-1] = '\0';

val++;

}

dbg(udev, "adding '%s'='%s'\n", key, val);

/* handle device, renamed by external tool, returning new path */

if (strcmp(key, "DEVPATH") == 0) {

char syspath[UTIL_PATH_SIZE];

info(udev, "updating devpath from '%s' to '%s'\n",

udev_device_get_devpath(dev), val);

util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), val, NULL);

udev_device_set_syspath(dev, syspath);

} else {

struct udev_list_entry *entry;

entry = udev_device_add_property(dev, key, val);

/* store in db, skip private keys */

if (key[0] != '.')

udev_list_entry_set_flags(entry, 1);

}

return 0;

}

static int import_file_into_properties(struct udev_device *dev, const char *filename)

{

FILE *f;

char line[UTIL_LINE_SIZE];

f = fopen(filename, "r");

if (f == NULL)

return -1;

while (fgets(line, sizeof(line), f) != NULL)

import_property_from_string(dev, line);

fclose(f);

return 0;

}

static int import_program_into_properties(struct udev_device *dev, const char *program)

{

struct udev *udev = udev_device_get_udev(dev);

char **envp;

char result[4096];

size_t reslen;

char *line;

envp = udev_device_get_properties_envp(dev);

if (util_run_program(udev, program, envp, result, sizeof(result), &reslen, NULL) != 0)

return -1;

line = result;

while (line != NULL) {

char *pos;

pos = strchr(line, '\n');

if (pos != NULL) {

pos[0] = '\0';

pos = &pos[1];

}

import_property_from_string(dev, line);

line = pos;

}

return 0;

}

static int import_parent_into_properties(struct udev_device *dev, const char *filter)

{

struct udev *udev = udev_device_get_udev(dev);

struct udev_device *dev_parent;

struct udev_list_entry *list_entry;

dev_parent = udev_device_get_parent(dev);

if (dev_parent == NULL)

return -1;

dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));

udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {

const char *key = udev_list_entry_get_name(list_entry);

const char *val = udev_list_entry_get_value(list_entry);

if (fnmatch(filter, key, 0) == 0) {

struct udev_list_entry *entry;

dbg(udev, "import key '%s=%s'\n", key, val);

entry = udev_device_add_property(dev, key, val);

/* store in db, skip private keys */

if (key[0] != '.')

udev_list_entry_set_flags(entry, 1);

}

}

return 0;

}

#define WAIT_LOOP_PER_SECOND 50

static int wait_for_file(struct udev_device *dev, const char *file, int timeout)

{

struct udev *udev = udev_device_get_udev(dev);

char filepath[UTIL_PATH_SIZE];

char devicepath[UTIL_PATH_SIZE];

struct stat stats;

int loop = timeout * WAIT_LOOP_PER_SECOND;

/* a relative path is a device attribute */

devicepath[0] = '\0';

if (file[0] != '/') {

util_strscpyl(devicepath, sizeof(devicepath),

udev_get_sys_path(udev), udev_device_get_devpath(dev), NULL);

util_strscpyl(filepath, sizeof(filepath), devicepath, "/", file, NULL);

file = filepath;

}

dbg(udev, "will wait %i sec for '%s'\n", timeout, file);

while (--loop) {

const struct timespec duration = { 0, 1000 * 1000 * 1000 / WAIT_LOOP_PER_SECOND };

/* lookup file */

if (stat(file, &stats) == 0) {

info(udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);

return 0;

}

/* make sure, the device did not disappear in the meantime */

if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {

info(udev, "device disappeared while waiting for '%s'\n", file);

return -2;

}

info(udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);

nanosleep(&duration, NULL);

}

info(udev, "waiting for '%s' failed\n", file);

return -1;

}

static int attr_subst_subdir(char *attr, size_t len)

{

int found = 0;

if (strstr(attr, "/*/")) {

char *pos;

char dirname[UTIL_PATH_SIZE];

const char *tail;

DIR *dir;

util_strscpy(dirname, sizeof(dirname), attr);

pos = strstr(dirname, "/*/");

if (pos == NULL)

return -1;

pos[0] = '\0';

tail = &pos[2];

dir = opendir(dirname);

if (dir != NULL) {

struct dirent *dent;

for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {

struct stat stats;

if (dent->d_name[0] == '.')

continue;

util_strscpyl(attr, len, dirname, "/", dent->d_name, tail, NULL);

if (stat(attr, &stats) == 0) {

found = 1;

break;

}

}

closedir(dir);

}

}

return found;

}

static int get_key(struct udev *udev, char **line, char **key, enum operation_type *op, char **value)

{

char *linepos;

char *temp;

linepos = *line;

if (linepos == NULL || linepos[0] == '\0')

return -1;

/* skip whitespace */

while (isspace(linepos[0]) || linepos[0] == ',')

linepos++;

/* get the key */

if (linepos[0] == '\0')

return -1;

*key = linepos;

while (1) {

linepos++;

if (linepos[0] == '\0')

return -1;

if (isspace(linepos[0]))

break;

if (linepos[0] == '=')

break;

if ((linepos[0] == '+') || (linepos[0] == '!') || (linepos[0] == ':'))

if (linepos[1] == '=')

break;

}

/* remember end of key */

temp = linepos;

/* skip whitespace after key */

while (isspace(linepos[0]))

linepos++;

if (linepos[0] == '\0')

return -1;

/* get operation type */

if (linepos[0] == '=' && linepos[1] == '=') {

*op = OP_MATCH;

linepos += 2;

} else if (linepos[0] == '!' && linepos[1] == '=') {

*op = OP_NOMATCH;

linepos += 2;

} else if (linepos[0] == '+' && linepos[1] == '=') {

*op = OP_ADD;

linepos += 2;

} else if (linepos[0] == '=') {

*op = OP_ASSIGN;

linepos++;

} else if (linepos[0] == ':' && linepos[1] == '=') {

*op = OP_ASSIGN_FINAL;

linepos += 2;

} else

return -1;

/* terminate key */

temp[0] = '\0';

/* skip whitespace after operator */

while (isspace(linepos[0]))

linepos++;

if (linepos[0] == '\0')

return -1;

/* get the value */

if (linepos[0] == '"')

linepos++;

else

return -1;

*value = linepos;

/* terminate */

temp = strchr(linepos, '"');

if (!temp)

return -1;

temp[0] = '\0';

temp++;

dbg(udev, "%s '%s'-'%s'\n", operation_str(*op), *key, *value);

/* move line to next key */

*line = temp;

return 0;

}

static char *get_key_attribute(struct udev *udev, char *str)

{

char *pos;

char *attr;

attr = strchr(str, '{');

if (attr != NULL) {

attr++;

pos = strchr(attr, '}');

if (pos == NULL) {

err(udev, "missing closing brace for format\n");

return NULL;

}

pos[0] = '\0';

dbg(udev, "attribute='%s'\n", attr);

return attr;

}

return NULL;

}

static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,

enum operation_type op,

const char *value, const void *data)

{

struct token *token = &rule_tmp->token[rule_tmp->token_cur];

const char *attr = NULL;

memset(token, 0x00, sizeof(struct token));

switch (type) {

case TK_M_ACTION:

case TK_M_DEVPATH:

case TK_M_KERNEL:

case TK_M_SUBSYSTEM:

case TK_M_DRIVER:

case TK_M_WAITFOR:

case TK_M_DEVLINK:

case TK_M_NAME:

case TK_M_KERNELS:

case TK_M_SUBSYSTEMS:

case TK_M_DRIVERS:

case TK_M_PROGRAM:

case TK_M_IMPORT_FILE:

case TK_M_IMPORT_PROG:

case TK_M_IMPORT_DB:

case TK_M_IMPORT_PARENT:

case TK_M_RESULT:

case TK_A_OWNER:

case TK_A_GROUP:

case TK_A_MODE:

case TK_A_NAME:

case TK_A_GOTO:

case TK_M_TAG:

case TK_A_TAG:

token->key.value_off = add_string(rule_tmp->rules, value);

break;

case TK_M_ENV:

case TK_M_ATTR:

case TK_M_ATTRS:

case TK_A_ATTR:

case TK_A_ENV:

attr = data;

token->key.value_off = add_string(rule_tmp->rules, value);

token->key.attr_off = add_string(rule_tmp->rules, attr);

break;

case TK_A_DEVLINK:

token->key.value_off = add_string(rule_tmp->rules, value);

token->key.devlink_unique = *(int *)data;

break;

case TK_M_TEST:

token->key.value_off = add_string(rule_tmp->rules, value);

if (data != NULL)

token->key.mode = *(mode_t *)data;

break;

case TK_A_STRING_ESCAPE_NONE:

case TK_A_STRING_ESCAPE_REPLACE:

break;

case TK_A_RUN:

token->key.value_off = add_string(rule_tmp->rules, value);

token->key.fail_on_error = *(int *)data;

break;

case TK_A_INOTIFY_WATCH:

case TK_A_DEVLINK_PRIO:

token->key.devlink_prio = *(int *)data;

break;

case TK_A_OWNER_ID:

token->key.uid = *(uid_t *)data;

break;

case TK_A_GROUP_ID:

token->key.gid = *(gid_t *)data;

break;

case TK_A_MODE_ID:

token->key.mode = *(mode_t *)data;

break;

case TK_A_EVENT_TIMEOUT:

token->key.event_timeout = *(int *)data;

break;

case TK_RULE:

case TK_M_PARENTS_MIN:

case TK_M_PARENTS_MAX:

case TK_M_MAX:

case TK_END:

case TK_UNSET:

err(rule_tmp->rules->udev, "wrong type %u\n", type);

return -1;

}

if (value != NULL && type < TK_M_MAX) {

/* check if we need to split or call fnmatch() while matching rules */

enum string_glob_type glob;

int has_split;

int has_glob;

has_split = (strchr(value, '|') != NULL);

has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL || strchr(value, '[') != NULL);

if (has_split && has_glob) {

glob = GL_SPLIT_GLOB;

} else if (has_split) {

glob = GL_SPLIT;

} else if (has_glob) {

if (strcmp(value, "?*") == 0)

glob = GL_SOMETHING;

else

glob = GL_GLOB;

} else {

glob = GL_PLAIN;

}

token->key.glob = glob;

}

if (value != NULL && type > TK_M_MAX) {

/* check if assigned value has substitution chars */

if (value[0] == '[')

token->key.subst = SB_SUBSYS;

else if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)

token->key.subst = SB_FORMAT;

else

token->key.subst = SB_NONE;

}

if (attr != NULL) {

/* check if property/attribut name has substitution chars */

if (attr[0] == '[')

token->key.attrsubst = SB_SUBSYS;

else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)

token->key.attrsubst = SB_FORMAT;

else

token->key.attrsubst = SB_NONE;

}

token->key.type = type;

token->key.op = op;

rule_tmp->token_cur++;

if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {

err(rule_tmp->rules->udev, "temporary rule array too small\n");

return -1;

}

return 0;

}

static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)

{

unsigned int i;

unsigned int start = 0;

unsigned int end = rule_tmp->token_cur;

for (i = 0; i < rule_tmp->token_cur; i++) {

enum token_type next_val = TK_UNSET;

unsigned int next_idx = 0;

unsigned int j;

/* find smallest value */

for (j = start; j < end; j++) {

if (rule_tmp->token[j].type == TK_UNSET)

continue;

if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {

next_val = rule_tmp->token[j].type;

next_idx = j;

}

}

/* add token and mark done */

if (add_token(rules, &rule_tmp->token[next_idx]) != 0)

return -1;

rule_tmp->token[next_idx].type = TK_UNSET;

/* shrink range */

if (next_idx == start)

start++;

if (next_idx+1 == end)

end--;

}

return 0;

}

static int add_rule(struct udev_rules *rules, char *line,

const char *filename, unsigned int filename_off, unsigned int lineno)

{

char *linepos;

char *attr;

struct rule_tmp rule_tmp;

bool bus_warn = false;

bool sysfs_warn = false;

bool id_warn = false;

memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));

rule_tmp.rules = rules;

rule_tmp.rule.type = TK_RULE;

rule_tmp.rule.rule.filename_off = filename_off;

rule_tmp.rule.rule.filename_line = lineno;

linepos = line;

while (1) {

char *key;

char *value;

enum operation_type op;

if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)

break;

if (strcmp(key, "ACTION") == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid ACTION operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);

continue;

}

if (strcmp(key, "DEVPATH") == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid DEVPATH operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);

continue;

}

if (strcmp(key, "KERNEL") == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid KERNEL operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);

continue;

}

if (strcmp(key, "SUBSYSTEM") == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid SUBSYSTEM operation\n");

goto invalid;

}

/* bus, class, subsystem events should all be the same */

if (strcmp(value, "subsystem") == 0 ||

strcmp(value, "bus") == 0 ||

strcmp(value, "class") == 0) {

if (strcmp(value, "bus") == 0 || strcmp(value, "class") == 0)

err(rules->udev, "'%s' must be specified as 'subsystem' \n"

"please fix it in %s:%u", value, filename, lineno);

rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, "subsystem|class|bus", NULL);

} else

rule_add_key(&rule_tmp, TK_M_SUBSYSTEM, op, value, NULL);

continue;

}

if (strcmp(key, "DRIVER") == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid DRIVER operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);

continue;

}

if (strncmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {

attr = get_key_attribute(rules->udev, key + sizeof("ATTR")-1);

if (attr == NULL) {

err(rules->udev, "error parsing ATTR attribute\n");

goto invalid;

}

if (op < OP_MATCH_MAX) {

rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);

} else {

rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);

}

continue;

}

if (strcmp(key, "KERNELS") == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid KERNELS operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);

continue;

}

if (strcmp(key, "ID") == 0) {

if (!id_warn) {

id_warn = true;

err(rules->udev, "ID= will be removed in a future udev version, "

"please use KERNEL= to match the event device, or KERNELS= "

"to match a parent device, in %s:%u\n", filename, lineno);

}

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid KERNELS operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);

continue;

}

if (strcmp(key, "SUBSYSTEMS") == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid SUBSYSTEMS operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);

continue;

}

if (strcmp(key, "BUS") == 0) {

if (!bus_warn) {

bus_warn = true;

err(rules->udev, "BUS= will be removed in a future udev version, "

"please use SUBSYSTEM= to match the event device, or SUBSYSTEMS= "

"to match a parent device, in %s:%u\n", filename, lineno);

}

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid SUBSYSTEMS operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);

continue;

}

if (strcmp(key, "DRIVERS") == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid DRIVERS operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);

continue;

}

if (strncmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid ATTRS operation\n");

goto invalid;

}

attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);

if (attr == NULL) {

err(rules->udev, "error parsing ATTRS attribute\n");

goto invalid;

}

if (strncmp(attr, "device/", 7) == 0)

err(rules->udev, "the 'device' link may not be available in a future kernel, "

"please fix it in %s:%u", filename, lineno);

else if (strstr(attr, "../") != NULL)

err(rules->udev, "do not reference parent sysfs directories directly, "

"it may break with a future kernel, please fix it in %s:%u", filename, lineno);

rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);

continue;

}

if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {

if (!sysfs_warn) {

sysfs_warn = true;

err(rules->udev, "SYSFS{}= will be removed in a future udev version, "

"please use ATTR{}= to match the event device, or ATTRS{}= "

"to match a parent device, in %s:%u\n", filename, lineno);

}

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid ATTRS operation\n");

goto invalid;

}

attr = get_key_attribute(rules->udev, key + sizeof("ATTRS")-1);

if (attr == NULL) {

err(rules->udev, "error parsing ATTRS attribute\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);

continue;

}

if (strncmp(key, "ENV{", sizeof("ENV{")-1) == 0) {

attr = get_key_attribute(rules->udev, key + sizeof("ENV")-1);

if (attr == NULL) {

err(rules->udev, "error parsing ENV attribute\n");

goto invalid;

}

if (op < OP_MATCH_MAX) {

if (rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr) != 0)

goto invalid;

} else {

if (rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr) != 0)

goto invalid;

}

continue;

}

if (strcmp(key, "TAG") == 0) {

if (op < OP_MATCH_MAX)

rule_add_key(&rule_tmp, TK_M_TAG, op, value, NULL);

else

rule_add_key(&rule_tmp, TK_A_TAG, op, value, NULL);

continue;

}

if (strcmp(key, "PROGRAM") == 0) {

rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);

continue;

}

if (strcmp(key, "RESULT") == 0) {

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid RESULT operation\n");

goto invalid;

}

rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);

continue;

}

if (strncmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {

attr = get_key_attribute(rules->udev, key + sizeof("IMPORT")-1);

if (attr != NULL && strstr(attr, "program")) {

dbg(rules->udev, "IMPORT will be executed\n");

rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);

} else if (attr != NULL && strstr(attr, "file")) {

dbg(rules->udev, "IMPORT will be included as file\n");

rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);

} else if (attr != NULL && strstr(attr, "db")) {

dbg(rules->udev, "IMPORT will include db values\n");

rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);

} else if (attr != NULL && strstr(attr, "parent")) {

dbg(rules->udev, "IMPORT will include the parent values\n");

rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);

} else {

/* figure it out if it is executable */

char file[UTIL_PATH_SIZE];

char *pos;

struct stat statbuf;

/* allow programs in /lib/udev called without the path */

if (value[0] != '/')

util_strscpyl(file, sizeof(file), LIBEXECDIR "/", value, NULL);

else

util_strscpy(file, sizeof(file), value);

pos = strchr(file, ' ');

if (pos)

pos[0] = '\0';

dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);

if (stat(file, &statbuf) == 0 && (statbuf.st_mode & S_IXUSR)) {

dbg(rules->udev, "IMPORT will be executed (autotype)\n");

rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);

} else {

dbg(rules->udev, "IMPORT will be included as file (autotype)\n");

rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);

}

}

continue;

}

if (strncmp(key, "TEST", sizeof("TEST")-1) == 0) {

mode_t mode = 0;

if (op > OP_MATCH_MAX) {

err(rules->udev, "invalid TEST operation\n");

goto invalid;

}

attr = get_key_attribute(rules->udev, key + sizeof("TEST")-1);

if (attr != NULL) {

mode = strtol(attr, NULL, 8);

rule_add_key(&rule_tmp, TK_M_TEST, op, value, &mode);

} else {

rule_add_key(&rule_tmp, TK_M_TEST, op, value, NULL);

}

continue;

}

if (strncmp(key, "RUN", sizeof("RUN")-1) == 0) {

int flag = 0;

attr = get_key_attribute(rules->udev, key + sizeof("RUN")-1);

if (attr != NULL && strstr(attr, "fail_event_on_error"))

flag = 1;

rule_add_key(&rule_tmp, TK_A_RUN, op, value, &flag);

continue;

}

if (strcmp(key, "WAIT_FOR") == 0 || strcmp(key, "WAIT_FOR_SYSFS") == 0) {

rule_add_key(&rule_tmp, TK_M_WAITFOR, 0, value, NULL);

continue;

}

if (strcmp(key, "LABEL") == 0) {

rule_tmp.rule.rule.label_off = add_string(rules, value);

continue;

}

if (strcmp(key, "GOTO") == 0) {

rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);

continue;

}

if (strncmp(key, "NAME", sizeof("NAME")-1) == 0) {

if (op < OP_MATCH_MAX) {

rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);

} else {

if (strcmp(value, "%k") == 0) {

err(rules->udev, "NAME=\"%%k\" is ignored because it breaks kernel supplied names, "

"please remove it from %s:%u\n", filename, lineno);

continue;

}

if (value[0] == '\0')

continue;

rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);

}

rule_tmp.rule.rule.flags = 1;

continue;

}

if (strncmp(key, "SYMLINK", sizeof("SYMLINK")-1) == 0) {

if (op < OP_MATCH_MAX) {

rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);

} else {

int flag = 0;

attr = get_key_attribute(rules->udev, key + sizeof("SYMLINK")-1);

if (attr != NULL && strstr(attr, "unique") != NULL)

flag = 1;

rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, &flag);

}

rule_tmp.rule.rule.flags = 1;

continue;

}

if (strcmp(key, "OWNER") == 0) {

uid_t uid;

char *endptr;

uid = strtoul(value, &endptr, 10);

if (endptr[0] == '\0') {

rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);

} else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {

uid = add_uid(rules, value);

rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);

} else if (rules->resolve_names >= 0) {

rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);

}

rule_tmp.rule.rule.flags = 1;

continue;

}

if (strcmp(key, "GROUP") == 0) {

gid_t gid;

char *endptr;

gid = strtoul(value, &endptr, 10);

if (endptr[0] == '\0') {

rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);

} else if ((rules->resolve_names > 0) && strchr("$%", value[0]) == NULL) {

gid = add_gid(rules, value);

rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);

} else if (rules->resolve_names >= 0) {

rule_add_key(&rule_tmp, TK_A_GROUP, op, value, NULL);

}

rule_tmp.rule.rule.flags = 1;

continue;

}

if (strcmp(key, "MODE") == 0) {

mode_t mode;

char *endptr;

mode = strtol(value, &endptr, 8);

if (endptr[0] == '\0')

rule_add_key(&rule_tmp, TK_A_MODE_ID, op, NULL, &mode);

else

rule_add_key(&rule_tmp, TK_A_MODE, op, value, NULL);

rule_tmp.rule.rule.flags = 1;

continue;

}

if (strcmp(key, "OPTIONS") == 0) {

const char *pos;

pos = strstr(value, "link_priority=");

if (pos != NULL) {

int prio = atoi(&pos[strlen("link_priority=")]);

rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, 0, NULL, &prio);

dbg(rules->udev, "link priority=%i\n", prio);

}

pos = strstr(value, "event_timeout=");

if (pos != NULL) {

int tout = atoi(&pos[strlen("event_timeout=")]);

rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, 0, NULL, &tout);

dbg(rules->udev, "event timeout=%i\n", tout);

}

pos = strstr(value, "string_escape=");

if (pos != NULL) {

pos = &pos[strlen("string_escape=")];

if (strncmp(pos, "none", strlen("none")) == 0)

rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, 0, NULL, NULL);

else if (strncmp(pos, "replace", strlen("replace")) == 0)

rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, 0, NULL, NULL);

}

pos = strstr(value, "nowatch");

if (pos != NULL) {

const int off = 0;

rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &off);

dbg(rules->udev, "inotify watch of device disabled\n");

} else {

pos = strstr(value, "watch");

if (pos != NULL) {

const int on = 1;

rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, 0, NULL, &on);

dbg(rules->udev, "inotify watch of device requested\n");

}

}

continue;

}

err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);

}

/* add rule token */

rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;

if (add_token(rules, &rule_tmp.rule) != 0)

goto invalid;

/* add tokens to list, sorted by type */

if (sort_token(rules, &rule_tmp) != 0)

goto invalid;

return 0;

invalid:

err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);

return -1;

}

static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)

{

FILE *f;

unsigned int first_token;

char line[UTIL_LINE_SIZE];

int line_nr = 0;

unsigned int i;

info(rules->udev, "reading '%s' as rules file\n", filename);

f = fopen(filename, "r");

if (f == NULL)

return -1;

first_token = rules->token_cur;

while (fgets(line, sizeof(line), f) != NULL) {

char *key;

size_t len;

/* skip whitespace */

line_nr++;

key = line;

while (isspace(key[0]))

key++;

/* comment */

if (key[0] == '#')

continue;

len = strlen(line);

if (len < 3)

continue;

/* continue reading if backslash+newline is found */

while (line[len-2] == '\\') {

if (fgets(&line[len-2], (sizeof(line)-len)+2, f) == NULL)

break;

if (strlen(&line[len-2]) < 2)

break;

line_nr++;

len = strlen(line);

}

if (len+1 >= sizeof(line)) {

err(rules->udev, "line too long '%s':%u, ignored\n", filename, line_nr);

continue;

}

add_rule(rules, key, filename, filename_off, line_nr);

}

fclose(f);

/* link GOTOs to LABEL rules in this file to be able to fast-forward */

for (i = first_token+1; i < rules->token_cur; i++) {

if (rules->tokens[i].type == TK_A_GOTO) {

char *label = &rules->buf[rules->tokens[i].key.value_off];

unsigned int j;

for (j = i+1; j < rules->token_cur; j++) {

if (rules->tokens[j].type != TK_RULE)

continue;

if (rules->tokens[j].rule.label_off == 0)

continue;

if (strcmp(label, &rules->buf[rules->tokens[j].rule.label_off]) != 0)

continue;

rules->tokens[i].key.rule_goto = j;

break;

}

if (rules->tokens[i].key.rule_goto == 0)

err(rules->udev, "GOTO '%s' has no matching label in: '%s'\n", label, filename);

}

}

return 0;

}

static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)

{

DIR *dir;

char filename[UTIL_PATH_SIZE];

dbg(udev, "open directory '%s'\n", dirname);

dir = opendir(dirname);

if (dir == NULL) {

info(udev, "unable to open '%s': %m\n", dirname);

return -1;

}

while (1) {

struct dirent *dent;

dent = readdir(dir);

if (dent == NULL || dent->d_name[0] == '\0')

break;

if (dent->d_name[0] == '.')

continue;

/* look for file matching with specified suffix */

if (suffix != NULL) {

const char *ext;

ext = strrchr(dent->d_name, '.');

if (ext == NULL)

continue;

if (strcmp(ext, suffix) != 0)

continue;

}

util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);

dbg(udev, "put file '%s' into list\n", filename);

udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);

}

closedir(dir);

return 0;

}

struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)

{

struct udev_rules *rules;

struct stat statbuf;

struct udev_list_node file_list;

struct udev_list_entry *file_loop, *file_tmp;

struct token end_token;

rules = malloc(sizeof(struct udev_rules));

if (rules == NULL)

return NULL;

memset(rules, 0x00, sizeof(struct udev_rules));

rules->udev = udev;

rules->resolve_names = resolve_names;

udev_list_init(&file_list);

/* init token array and string buffer */

rules->tokens = malloc(PREALLOC_TOKEN * sizeof(struct token));

if (rules->tokens == NULL)

return NULL;

rules->token_max = PREALLOC_TOKEN;

rules->buf = malloc(PREALLOC_STRBUF);

if (rules->buf == NULL)

return NULL;

rules->buf_max = PREALLOC_STRBUF;

/* offset 0 is always '\0' */

rules->buf[0] = '\0';

rules->buf_cur = 1;

dbg(udev, "prealloc %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",

rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);

rules->trie_nodes = malloc(PREALLOC_TRIE * sizeof(struct trie_node));

if (rules->trie_nodes == NULL)

return NULL;

rules->trie_nodes_max = PREALLOC_TRIE;

/* offset 0 is the trie root, with an empty string */

memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));

rules->trie_nodes_cur = 1;

if (udev_get_rules_path(udev) != NULL) {

/* custom rules location for testing */

add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");

} else {

char filename[PATH_MAX];

struct udev_list_node sort_list;

struct udev_list_entry *sort_loop, *sort_tmp;

/* read user/custom rules */

add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");

/* read dynamic/temporary rules */

util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);

udev_list_init(&sort_list);

add_matching_files(udev, &sort_list, filename, ".rules");

/* read default rules */

add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");

/* sort all rules files by basename into list of files */

udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {

const char *sort_name = udev_list_entry_get_name(sort_loop);

const char *sort_base = strrchr(sort_name, '/');

if (sort_base == NULL)

continue;

/* sort entry into existing list */

udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {

const char *file_name = udev_list_entry_get_name(file_loop);

const char *file_base = strrchr(file_name, '/');

if (file_base == NULL)

continue;

if (strcmp(file_base, sort_base) == 0) {

info(udev, "rule file basename '%s' already added, ignoring '%s'\n",

file_name, sort_name);

udev_list_entry_delete(sort_loop);

sort_loop = NULL;

break;

}

if (strcmp(file_base, sort_base) > 0) {

/* found later file, insert before */

udev_list_entry_remove(sort_loop);

udev_list_entry_insert_before(sort_loop, file_loop);

sort_loop = NULL;

break;

}

}

/* current file already handled */

if (sort_loop == NULL)

continue;

/* no later file, append to end of list */

udev_list_entry_remove(sort_loop);

udev_list_entry_append(sort_loop, &file_list);

}

}

/* add all filenames to the string buffer */

udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {

const char *filename = udev_list_entry_get_name(file_loop);

unsigned int filename_off;

filename_off = add_string(rules, filename);

/* the offset in the rule is limited to unsigned short */

if (filename_off < USHRT_MAX)

udev_list_entry_set_flags(file_loop, filename_off);

}

/* parse list of files */

udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {

const char *filename = udev_list_entry_get_name(file_loop);

unsigned int filename_off = udev_list_entry_get_flags(file_loop);

if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)

parse_file(rules, filename, filename_off);

else

err(udev, "can not read '%s'\n", filename);

udev_list_entry_delete(file_loop);

}

memset(&end_token, 0x00, sizeof(struct token));

end_token.type = TK_END;

add_token(rules, &end_token);

/* shrink allocated token and string buffer */

if (rules->token_cur < rules->token_max) {

struct token *tokens;

tokens = realloc(rules->tokens, rules->token_cur * sizeof(struct token));

if (tokens != NULL || rules->token_cur == 0) {

rules->tokens = tokens;

rules->token_max = rules->token_cur;

}

}

if (rules->buf_cur < rules->buf_max) {

char *buf;

buf = realloc(rules->buf, rules->buf_cur);

if (buf != NULL || rules->buf_cur == 0) {

rules->buf = buf;

rules->buf_max = rules->buf_cur;

}

}

info(udev, "rules use %zu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",

rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);

info(udev, "temporary index used %zu bytes (%u * %zu bytes)\n",

rules->trie_nodes_cur * sizeof(struct trie_node),

rules->trie_nodes_cur, sizeof(struct trie_node));

/* cleanup trie */

free(rules->trie_nodes);

rules->trie_nodes = NULL;

rules->trie_nodes_cur = 0;

rules->trie_nodes_max = 0;

/* cleanup uid/gid cache */

free(rules->uids);

rules->uids = NULL;

rules->uids_cur = 0;

rules->uids_max = 0;

free(rules->gids);

rules->gids = NULL;

rules->gids_cur = 0;

rules->gids_max = 0;

dump_rules(rules);

return rules;

}

void udev_rules_unref(struct udev_rules *rules)

{

if (rules == NULL)

return;

free(rules->tokens);

free(rules->buf);

free(rules->trie_nodes);

free(rules->uids);

free(rules->gids);

free(rules);

}

static int match_key(struct udev_rules *rules, struct token *token, const char *val)

{

char *key_value = &rules->buf[token->key.value_off];

char *pos;

int match = 0;

if (val == NULL)

val = "";

switch (token->key.glob) {

case GL_PLAIN:

match = (strcmp(key_value, val) == 0);

break;

case GL_GLOB:

match = (fnmatch(key_value, val, 0) == 0);

break;

case GL_SPLIT:

{

const char *split;

size_t len;

split = &rules->buf[token->key.value_off];

len = strlen(val);

while (1) {

const char *next;

next = strchr(split, '|');

if (next != NULL) {

size_t matchlen = (size_t)(next - split);

match = (matchlen == len && strncmp(split, val, matchlen) == 0);

if (match)

break;

} else {

match = (strcmp(split, val) == 0);

break;

}

split = &next[1];

}

break;

}

case GL_SPLIT_GLOB:

{

char value[UTIL_PATH_SIZE];

util_strscpy(value, sizeof(value), &rules->buf[token->key.value_off]);

key_value = value;

while (key_value != NULL) {

pos = strchr(key_value, '|');

if (pos != NULL) {

pos[0] = '\0';

pos = &pos[1];

}

dbg(rules->udev, "match %s '%s' <-> '%s'\n", token_str(token->type), key_value, val);

match = (fnmatch(key_value, val, 0) == 0);

if (match)

break;

key_value = pos;

}

break;

}

case GL_SOMETHING:

match = (val[0] != '\0');

break;

case GL_UNSET:

return -1;

}

if (match && (token->key.op == OP_MATCH)) {

dbg(rules->udev, "%s is true (matching value)\n", token_str(token->type));

return 0;

}

if (!match && (token->key.op == OP_NOMATCH)) {

dbg(rules->udev, "%s is true (non-matching value)\n", token_str(token->type));

return 0;

}

dbg(rules->udev, "%s is not true\n", token_str(token->type));

return -1;

}

static int match_attr(struct udev_rules *rules, struct udev_device *dev, struct udev_event *event, struct token *cur)

{

const char *name;

char nbuf[UTIL_NAME_SIZE];

const char *value;

char vbuf[UTIL_NAME_SIZE];

size_t len;

name = &rules->buf[cur->key.attr_off];

switch (cur->key.attrsubst) {

case SB_FORMAT:

udev_event_apply_format(event, name, nbuf, sizeof(nbuf));

name = nbuf;

/* fall through */

case SB_NONE:

value = udev_device_get_sysattr_value(dev, name);

if (value == NULL)

return -1;

break;

case SB_SUBSYS:

if (util_resolve_subsys_kernel(event->udev, name, vbuf, sizeof(vbuf), 1) != 0)

return -1;

value = vbuf;

break;

default:

return -1;

}

/* remove trailing whitespace, if not asked to match for it */

len = strlen(value);

if (len > 0 && isspace(value[len-1])) {

const char *key_value;

size_t klen;

key_value = &rules->buf[cur->key.value_off];

klen = strlen(key_value);

if (klen > 0 && !isspace(key_value[klen-1])) {

if (value != vbuf) {

util_strscpy(vbuf, sizeof(vbuf), value);

value = vbuf;

}

while (len > 0 && isspace(vbuf[--len]))

vbuf[len] = '\0';

dbg(rules->udev, "removed trailing whitespace from '%s'\n", value);

}

}

return match_key(rules, cur, value);

}

enum escape_type {

ESCAPE_UNSET,

ESCAPE_NONE,

ESCAPE_REPLACE,

};

int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)

{

struct token *cur;

struct token *rule;

enum escape_type esc = ESCAPE_UNSET;

bool can_set_name;

if (rules->tokens == NULL)

return -1;

can_set_name = ((strcmp(udev_device_get_action(event->dev), "remove") != 0) &&

(major(udev_device_get_devnum(event->dev)) > 0 ||

strcmp(udev_device_get_subsystem(event->dev), "net") == 0));

/* loop through token list, match, run actions or forward to next rule */

cur = &rules->tokens[0];

rule = cur;

while (1) {

dump_token(rules, cur);

switch (cur->type) {

case TK_RULE:

/* current rule */

rule = cur;

/* possibly skip rules which want to set NAME, SYMLINK, OWNER, GROUP, MODE */

if (!can_set_name && rule->rule.flags)

goto nomatch;

esc = ESCAPE_UNSET;

break;

case TK_M_ACTION:

if (match_key(rules, cur, udev_device_get_action(event->dev)) != 0)

goto nomatch;

break;

case TK_M_DEVPATH:

if (match_key(rules, cur, udev_device_get_devpath(event->dev)) != 0)

goto nomatch;

break;

case TK_M_KERNEL:

if (match_key(rules, cur, udev_device_get_sysname(event->dev)) != 0)

goto nomatch;

break;

case TK_M_DEVLINK:

{

size_t devlen = strlen(udev_get_dev_path(event->udev))+1;

struct udev_list_entry *list_entry;

int match = 0;

udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(event->dev)) {

const char *devlink;

devlink = &udev_list_entry_get_name(list_entry)[devlen];

if (match_key(rules, cur, devlink) == 0) {

match = 1;

break;

}

}

if (!match)

goto nomatch;

break;

}

case TK_M_NAME:

if (match_key(rules, cur, event->name) != 0)

goto nomatch;

break;

case TK_M_ENV:

{

const char *key_name = &rules->buf[cur->key.attr_off];

const char *value;

value = udev_device_get_property_value(event->dev, key_name);

if (value == NULL) {

dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);

value = "";

}

if (match_key(rules, cur, value))

goto nomatch;

break;

}

case TK_M_TAG:

{

struct udev_list_entry *list_entry;

bool match = false;

udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(event->dev)) {

if (strcmp(&rules->buf[cur->key.value_off], udev_list_entry_get_name(list_entry)) == 0) {

match = true;

break;

}

}

if (!match && (cur->key.op != OP_NOMATCH))

goto nomatch;

break;

}

case TK_M_SUBSYSTEM:

if (match_key(rules, cur, udev_device_get_subsystem(event->dev)) != 0)

goto nomatch;

break;

case TK_M_DRIVER:

if (match_key(rules, cur, udev_device_get_driver(event->dev)) != 0)

goto nomatch;

break;

case TK_M_WAITFOR:

{

char filename[UTIL_PATH_SIZE];

int found;

udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));

found = (wait_for_file(event->dev, filename, 10) == 0);

if (!found && (cur->key.op != OP_NOMATCH))

goto nomatch;

break;

}

case TK_M_ATTR:

if (match_attr(rules, event->dev, event, cur) != 0)

goto nomatch;

break;

case TK_M_KERNELS:

case TK_M_SUBSYSTEMS:

case TK_M_DRIVERS:

case TK_M_ATTRS:

{

struct token *next;

/* get whole sequence of parent matches */

next = cur;

while (next->type > TK_M_PARENTS_MIN && next->type < TK_M_PARENTS_MAX)

next++;

/* loop over parents */

event->dev_parent = event->dev;

while (1) {

struct token *key;

dbg(event->udev, "parent: '%s'\n", udev_device_get_syspath(event->dev_parent));

/* loop over sequence of parent match keys */

for (key = cur; key < next; key++ ) {

dump_token(rules, key);

switch(key->type) {

case TK_M_KERNELS:

if (match_key(rules, key, udev_device_get_sysname(event->dev_parent)) != 0)

goto try_parent;

break;

case TK_M_SUBSYSTEMS:

if (match_key(rules, key, udev_device_get_subsystem(event->dev_parent)) != 0)

goto try_parent;

break;

case TK_M_DRIVERS:

if (match_key(rules, key, udev_device_get_driver(event->dev_parent)) != 0)

goto try_parent;

break;

case TK_M_ATTRS:

if (match_attr(rules, event->dev_parent, event, key) != 0)

goto try_parent;

break;

default:

goto nomatch;

}

dbg(event->udev, "parent key matched\n");

}

dbg(event->udev, "all parent keys matched\n");

/* all keys matched */

break;

try_parent:

event->dev_parent = udev_device_get_parent(event->dev_parent);

if (event->dev_parent == NULL)

goto nomatch;

}

/* move behind our sequence of parent match keys */

cur = next;

continue;

}

case TK_M_TEST:

{

char filename[UTIL_PATH_SIZE];

struct stat statbuf;

int match;

udev_event_apply_format(event, &rules->buf[cur->key.value_off], filename, sizeof(filename));

if (util_resolve_subsys_kernel(event->udev, filename, filename, sizeof(filename), 0) != 0) {

if (filename[0] != '/') {

char tmp[UTIL_PATH_SIZE];

util_strscpy(tmp, sizeof(tmp), filename);

util_strscpyl(filename, sizeof(filename),

udev_device_get_syspath(event->dev), "/", tmp, NULL);

}

}

attr_subst_subdir(filename, sizeof(filename));

match = (stat(filename, &statbuf) == 0);

dbg(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");

if (match && cur->key.mode > 0) {

match = ((statbuf.st_mode & cur->key.mode) > 0);

dbg(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,

match ? "matches" : "does not match", cur->key.mode);

}

if (match && cur->key.op == OP_NOMATCH)

goto nomatch;

if (!match && cur->key.op == OP_MATCH)

goto nomatch;

break;

}

case TK_M_PROGRAM:

{

char program[UTIL_PATH_SIZE];

char **envp;

char result[UTIL_PATH_SIZE];

free(event->program_result);

event->program_result = NULL;

udev_event_apply_format(event, &rules->buf[cur->key.value_off], program, sizeof(program));

envp = udev_device_get_properties_envp(event->dev);

info(event->udev, "PROGRAM '%s' %s:%u\n",

program,

&rules->buf[rule->rule.filename_off],