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Systemd/src/udev/udev-rules.c

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/* SPDX-License-Identifier: GPL-2.0+ */
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "alloc-util.h"
#include "conf-files.h"
#include "def.h"
#include "dirent-util.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "fs-util.h"
#include "glob-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "strbuf.h"
#include "string-util.h"
#include "strv.h"
#include "sysctl-util.h"
#include "udev-builtin.h"
#include "udev.h"
#include "user-util.h"
#include "util.h"
#define PREALLOC_TOKEN 2048
struct uid_gid {
unsigned name_off;
union {
uid_t uid;
gid_t gid;
};
};
static const char* const rules_dirs[] = {
"/etc/udev/rules.d",
"/run/udev/rules.d",
UDEVLIBEXECDIR "/rules.d",
NULL
};
struct udev_rules {
usec_t dirs_ts_usec;
int resolve_names;
/* every key in the rules file becomes a token */
struct token *tokens;
unsigned token_cur;
unsigned token_max;
/* all key strings are copied and de-duplicated in a single continuous string buffer */
struct strbuf *strbuf;
/* during rule parsing, uid/gid lookup results are cached */
struct uid_gid *uids;
unsigned uids_cur;
unsigned uids_max;
struct uid_gid *gids;
unsigned gids_cur;
unsigned gids_max;
};
static char *rules_str(struct udev_rules *rules, unsigned off) {
return rules->strbuf->buf + off;
}
static unsigned rules_add_string(struct udev_rules *rules, const char *s) {
return strbuf_add_string(rules->strbuf, s, strlen(s));
}
/* KEY=="", KEY!="", KEY+="", KEY-="", KEY="", KEY:="" */
enum operation_type {
OP_UNSET,
OP_MATCH,
OP_NOMATCH,
OP_MATCH_MAX,
OP_ADD,
OP_REMOVE,
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,
};
/* tokens of a rule are sorted/handled in this order */
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_SYSCTL, /* 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_TAGS, /* val */
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_BUILTIN, /* val */
TK_M_IMPORT_DB, /* val */
TK_M_IMPORT_CMDLINE, /* 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_DB_PERSIST,
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_TAG, /* val */
TK_A_STATIC_NODE, /* val */
TK_A_SECLABEL, /* val, attr */
TK_A_ENV, /* val, attr */
TK_A_NAME, /* val */
TK_A_DEVLINK, /* val */
TK_A_ATTR, /* val, attr */
TK_A_SYSCTL, /* val, attr */
TK_A_RUN_BUILTIN, /* val, bool */
TK_A_RUN_PROGRAM, /* val, bool */
TK_A_GOTO, /* size_t */
TK_END,
};
/* we try to pack stuff in a way that we take only 12 bytes per token */
struct token {
union {
unsigned char type; /* same in rule and key */
struct {
enum token_type type:8;
bool can_set_name:1;
bool has_static_node:1;
unsigned unused:6;
unsigned short token_count;
unsigned 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 value_off;
union {
unsigned attr_off;
unsigned rule_goto;
mode_t mode;
uid_t uid;
gid_t gid;
int devlink_prio;
int watch;
enum udev_builtin_cmd builtin_cmd;
};
} key;
};
};
#define MAX_TK 64
struct rule_tmp {
struct udev_rules *rules;
struct token rule;
struct token token[MAX_TK];
unsigned token_cur;
};
#ifdef 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_REMOVE] = "remove",
[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_SYSCTL] = "M SYSCTL",
[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_TAGS] = "M TAGS",
[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_BUILTIN] = "M IMPORT_BUILTIN",
[TK_M_IMPORT_DB] = "M IMPORT_DB",
[TK_M_IMPORT_CMDLINE] = "M IMPORT_CMDLINE",
[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_DB_PERSIST] = "A DB_PERSIST",
[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_STATIC_NODE] = "A STATIC_NODE",
[TK_A_SECLABEL] = "A SECLABEL",
[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_ATTR] = "A ATTR",
[TK_A_SYSCTL] = "A SYSCTL",
[TK_A_RUN_BUILTIN] = "A RUN_BUILTIN",
[TK_A_RUN_PROGRAM] = "A RUN_PROGRAM",
[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_str(rules, token->key.value_off);
const char *attr = &rules->strbuf->buf[token->key.attr_off];
switch (type) {
case TK_RULE:
{
const char *tks_ptr = (char *)rules->tokens;
const char *tk_ptr = (char *)token;
unsigned idx = (tk_ptr - tks_ptr) / sizeof(struct token);
log_debug("* RULE %s:%u, token: %u, count: %u, label: '%s'",
&rules->strbuf->buf[token->rule.filename_off], token->rule.filename_line,
idx, token->rule.token_count,
&rules->strbuf->buf[token->rule.label_off]);
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_TAGS:
case TK_M_PROGRAM:
case TK_M_IMPORT_FILE:
case TK_M_IMPORT_PROG:
case TK_M_IMPORT_DB:
case TK_M_IMPORT_CMDLINE:
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_BUILTIN:
case TK_A_RUN_PROGRAM:
log_debug("%s %s '%s'(%s)",
token_str(type), operation_str(op), value, string_glob_str(glob));
break;
case TK_M_IMPORT_BUILTIN:
log_debug("%s %i '%s'", token_str(type), token->key.builtin_cmd, value);
break;
case TK_M_ATTR:
case TK_M_SYSCTL:
case TK_M_ATTRS:
case TK_M_ENV:
case TK_A_ATTR:
case TK_A_SYSCTL:
case TK_A_ENV:
log_debug("%s %s '%s' '%s'(%s)",
token_str(type), operation_str(op), attr, value, string_glob_str(glob));
break;
case TK_M_TAG:
case TK_A_TAG:
log_debug("%s %s '%s'", token_str(type), operation_str(op), value);
break;
case TK_A_STRING_ESCAPE_NONE:
case TK_A_STRING_ESCAPE_REPLACE:
case TK_A_DB_PERSIST:
log_debug("%s", token_str(type));
break;
case TK_M_TEST:
log_debug("%s %s '%s'(%s) %#o",
token_str(type), operation_str(op), value, string_glob_str(glob), token->key.mode);
break;
case TK_A_INOTIFY_WATCH:
log_debug("%s %u", token_str(type), token->key.watch);
break;
case TK_A_DEVLINK_PRIO:
log_debug("%s %u", token_str(type), token->key.devlink_prio);
break;
case TK_A_OWNER_ID:
log_debug("%s %s %u", token_str(type), operation_str(op), token->key.uid);
break;
case TK_A_GROUP_ID:
log_debug("%s %s %u", token_str(type), operation_str(op), token->key.gid);
break;
case TK_A_MODE_ID:
log_debug("%s %s %#o", token_str(type), operation_str(op), token->key.mode);
break;
case TK_A_STATIC_NODE:
log_debug("%s '%s'", token_str(type), value);
break;
case TK_A_SECLABEL:
log_debug("%s %s '%s' '%s'", token_str(type), operation_str(op), attr, value);
break;
case TK_A_GOTO:
log_debug("%s '%s' %u", token_str(type), value, token->key.rule_goto);
break;
case TK_END:
log_debug("* %s", token_str(type));
break;
case TK_M_PARENTS_MIN:
case TK_M_PARENTS_MAX:
case TK_M_MAX:
case TK_UNSET:
log_debug("unknown type %u", type);
break;
}
}
static void dump_rules(struct udev_rules *rules) {
unsigned i;
log_debug("dumping %u (%zu bytes) tokens, %zu (%zu bytes) strings",
rules->token_cur,
rules->token_cur * sizeof(struct token),
rules->strbuf->nodes_count,
rules->strbuf->len);
for (i = 0; i < rules->token_cur; i++)
dump_token(rules, &rules->tokens[i]);
}
#else
static inline void dump_token(struct udev_rules *rules, struct token *token) {}
static inline void dump_rules(struct udev_rules *rules) {}
#endif /* DEBUG */
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 add;
/* double the buffer size */
add = rules->token_max;
if (add < 8)
add = 8;
tokens = reallocarray(rules->tokens, rules->token_max + add, sizeof(struct token));
if (tokens == NULL)
return -1;
rules->tokens = tokens;
rules->token_max += add;
}
memcpy(&rules->tokens[rules->token_cur], token, sizeof(struct token));
rules->token_cur++;
return 0;
}
static void log_unknown_owner(int error, const char *entity, const char *owner) {
if (IN_SET(abs(error), ENOENT, ESRCH))
log_error("Specified %s '%s' unknown", entity, owner);
else
log_error_errno(error, "Error resolving %s '%s': %m", entity, owner);
}
static uid_t add_uid(struct udev_rules *rules, const char *owner) {
unsigned i;
uid_t uid = 0;
unsigned off;
int r;
/* lookup, if we know it already */
for (i = 0; i < rules->uids_cur; i++) {
off = rules->uids[i].name_off;
if (streq(rules_str(rules, off), owner)) {
uid = rules->uids[i].uid;
return uid;
}
}
r = get_user_creds(&owner, &uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
if (r < 0)
log_unknown_owner(r, "user", owner);
/* grow buffer if needed */
if (rules->uids_cur+1 >= rules->uids_max) {
struct uid_gid *uids;
unsigned add;
/* double the buffer size */
add = rules->uids_max;
if (add < 1)
add = 8;
uids = reallocarray(rules->uids, rules->uids_max + add, sizeof(struct uid_gid));
if (uids == NULL)
return uid;
rules->uids = uids;
rules->uids_max += add;
}
rules->uids[rules->uids_cur].uid = uid;
off = rules_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 i;
gid_t gid = 0;
unsigned off;
int r;
/* lookup, if we know it already */
for (i = 0; i < rules->gids_cur; i++) {
off = rules->gids[i].name_off;
if (streq(rules_str(rules, off), group)) {
gid = rules->gids[i].gid;
return gid;
}
}
r = get_group_creds(&group, &gid, USER_CREDS_ALLOW_MISSING);
if (r < 0)
log_unknown_owner(r, "group", group);
/* grow buffer if needed */
if (rules->gids_cur+1 >= rules->gids_max) {
struct uid_gid *gids;
unsigned add;
/* double the buffer size */
add = rules->gids_max;
if (add < 1)
add = 8;
gids = reallocarray(rules->gids, rules->gids_max + add, sizeof(struct uid_gid));
if (gids == NULL)
return gid;
rules->gids = gids;
rules->gids_max += add;
}
rules->gids[rules->gids_cur].gid = gid;
off = rules_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) {
char *key;
char *val;
size_t len;
/* find key */
key = line;
while (isspace(key[0]))
key++;
/* comment or empty line */
if (IN_SET(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 (IN_SET(val[0], '"', '\'')) {
if (len == 1 || val[len-1] != val[0]) {
log_debug("inconsistent quoting: '%s', skip", line);
return -1;
}
val[len-1] = '\0';
val++;
}
udev_device_add_property(dev, key, val);
return 0;
}
static int import_file_into_properties(struct udev_device *dev, const char *filename) {
_cleanup_fclose_ FILE *f = NULL;
int r;
f = fopen(filename, "re");
if (!f)
return -errno;
for (;;) {
_cleanup_free_ char *line = NULL;
r = read_line(f, LONG_LINE_MAX, &line);
if (r < 0)
return r;
if (r == 0)
break;
(void) import_property_from_string(dev, line);
}
return 0;
}
static int import_program_into_properties(struct udev_event *event,
usec_t timeout_usec,
usec_t timeout_warn_usec,
const char *program) {
char result[UTIL_LINE_SIZE];
char *line;
int err;
err = udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, result, sizeof(result));
if (err < 0)
return err;
line = result;
while (line != NULL) {
char *pos;
pos = strchr(line, '\n');
if (pos != NULL) {
pos[0] = '\0';
pos = &pos[1];
}
(void) import_property_from_string(event->dev, line);
line = pos;
}
return 0;
}
static int import_parent_into_properties(struct udev_device *dev, const char *filter) {
struct udev_device *dev_parent;
struct udev_list_entry *list_entry;
assert(dev);
assert(filter);
dev_parent = udev_device_get_parent(dev);
if (dev_parent == NULL)
return -1;
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)
udev_device_add_property(dev, key, val);
}
return 0;
}
static void attr_subst_subdir(char *attr, size_t len) {
const char *pos, *tail, *path;
_cleanup_closedir_ DIR *dir = NULL;
struct dirent *dent;
pos = strstr(attr, "/*/");
if (!pos)
return;
tail = pos + 2;
path = strndupa(attr, pos - attr + 1); /* include slash at end */
dir = opendir(path);
if (dir == NULL)
return;
FOREACH_DIRENT_ALL(dent, dir, break)
if (dent->d_name[0] != '.') {
char n[strlen(dent->d_name) + strlen(tail) + 1];
strscpyl(n, sizeof n, dent->d_name, tail, NULL);
if (faccessat(dirfd(dir), n, F_OK, 0) == 0) {
strscpyl(attr, len, path, n, NULL);
break;
}
}
}
static int get_key(char **line, char **key, enum operation_type *op, char **value) {
char *linepos;
char *temp;
unsigned i, j;
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;
for (;;) {
linepos++;
if (linepos[0] == '\0')
return -1;
if (isspace(linepos[0]))
break;
if (linepos[0] == '=')
break;
if (IN_SET(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] == '-' && linepos[1] == '=') {
*op = OP_REMOVE;
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 */
for (i = 0, j = 0; ; i++, j++) {
if (linepos[i] == '"')
break;
if (linepos[i] == '\0')
return -1;
/* double quotes can be escaped */
if (linepos[i] == '\\')
if (linepos[i+1] == '"')
i++;
linepos[j] = linepos[i];
}
linepos[j] = '\0';
/* move line to next key */
*line = linepos + i + 1;
return 0;
}
/* extract possible KEY{attr} */
static const char *get_key_attribute(char *str) {
char *pos;
char *attr;
attr = strchr(str, '{');
if (attr != NULL) {
attr++;
pos = strchr(attr, '}');
if (pos == NULL) {
log_error("Missing closing brace for format");
return NULL;
}
pos[0] = '\0';
return attr;
}
return NULL;
}
static void 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;
assert(rule_tmp->token_cur < ELEMENTSOF(rule_tmp->token));
memzero(token, 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_TAGS:
case TK_M_PROGRAM:
case TK_M_IMPORT_FILE:
case TK_M_IMPORT_PROG:
case TK_M_IMPORT_DB:
case TK_M_IMPORT_CMDLINE:
case TK_M_IMPORT_PARENT:
case TK_M_RESULT:
case TK_A_OWNER:
case TK_A_GROUP:
case TK_A_MODE:
case TK_A_DEVLINK:
case TK_A_NAME:
case TK_A_GOTO:
case TK_M_TAG:
case TK_A_TAG:
case TK_A_STATIC_NODE:
token->key.value_off = rules_add_string(rule_tmp->rules, value);
break;
case TK_M_IMPORT_BUILTIN:
token->key.value_off = rules_add_string(rule_tmp->rules, value);
token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
break;
case TK_M_ENV:
case TK_M_ATTR:
case TK_M_SYSCTL:
case TK_M_ATTRS:
case TK_A_ATTR:
case TK_A_SYSCTL:
case TK_A_ENV:
case TK_A_SECLABEL:
attr = data;
token->key.value_off = rules_add_string(rule_tmp->rules, value);
token->key.attr_off = rules_add_string(rule_tmp->rules, attr);
break;
case TK_M_TEST:
token->key.value_off = rules_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:
case TK_A_DB_PERSIST:
break;
case TK_A_RUN_BUILTIN:
case TK_A_RUN_PROGRAM:
token->key.builtin_cmd = *(enum udev_builtin_cmd *)data;
token->key.value_off = rules_add_string(rule_tmp->rules, value);
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_RULE:
case TK_M_PARENTS_MIN:
case TK_M_PARENTS_MAX:
case TK_M_MAX:
case TK_END:
case TK_UNSET:
assert_not_reached("wrong type");
}
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 = string_is_glob(value);
if (has_split && has_glob) {
glob = GL_SPLIT_GLOB;
} else if (has_split) {
glob = GL_SPLIT;
} else if (has_glob) {
if (streq(value, "?*"))
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, '$') != NULL)
token->key.subst = SB_FORMAT;
else
token->key.subst = SB_NONE;
}
if (attr != NULL) {
/* check if property/attribute name has substitution chars */
if (attr[0] == '[')
token->key.attrsubst = SB_SUBSYS;
else if (strchr(attr, '%') != NULL || strchr(attr, '$') != NULL)
token->key.attrsubst = SB_FORMAT;
else
token->key.attrsubst = SB_NONE;
}
token->key.type = type;
token->key.op = op;
rule_tmp->token_cur++;
}
static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp) {
unsigned i;
unsigned start = 0;
unsigned end = rule_tmp->token_cur;
for (i = 0; i < rule_tmp->token_cur; i++) {
enum token_type next_val = TK_UNSET;
unsigned next_idx = 0;
unsigned 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;
}
#define LOG_RULE_ERROR(fmt, ...) log_error("Invalid rule %s:%u: " fmt, filename, lineno, ##__VA_ARGS__)
#define LOG_RULE_WARNING(fmt, ...) log_warning("%s:%u: " fmt, filename, lineno, ##__VA_ARGS__)
#define LOG_RULE_DEBUG(fmt, ...) log_debug("%s:%u: " fmt, filename, lineno, ##__VA_ARGS__)
#define LOG_AND_RETURN(fmt, ...) { LOG_RULE_ERROR(fmt, __VA_ARGS__); return; }
static void add_rule(struct udev_rules *rules, char *line,
const char *filename, unsigned filename_off, unsigned lineno) {
char *linepos;
const char *attr;
struct rule_tmp rule_tmp = {
.rules = rules,
.rule.type = TK_RULE,
};
/* the offset in the rule is limited to unsigned short */
if (filename_off < USHRT_MAX)
rule_tmp.rule.rule.filename_off = filename_off;
rule_tmp.rule.rule.filename_line = lineno;
linepos = line;
for (;;) {
char *key;
char *value;
enum operation_type op;
if (get_key(&linepos, &key, &op, &value) != 0) {
/* Avoid erroring on trailing whitespace. This is probably rare
* so save the work for the error case instead of always trying
* to strip the trailing whitespace with strstrip(). */
while (isblank(*linepos))
linepos++;
/* If we aren't at the end of the line, this is a parsing error.
* Make a best effort to describe where the problem is. */
if (!strchr(NEWLINE, *linepos)) {
char buf[2] = {*linepos};
_cleanup_free_ char *tmp;
tmp = cescape(buf);
log_error("invalid key/value pair in file %s on line %u, starting at character %tu ('%s')",
filename, lineno, linepos - line + 1, tmp);
if (*linepos == '#')
log_error("hint: comments can only start at beginning of line");
}
break;
}
if (rule_tmp.token_cur >= ELEMENTSOF(rule_tmp.token))
LOG_AND_RETURN("temporary rule array too small, aborting event processing with %u items", rule_tmp.token_cur);
if (streq(key, "ACTION")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_ACTION, op, value, NULL);
} else if (streq(key, "DEVPATH")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_DEVPATH, op, value, NULL);
} else if (streq(key, "KERNEL")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_KERNEL, op, value, NULL);
} else if (streq(key, "SUBSYSTEM")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
/* bus, class, subsystem events should all be the same */
if (STR_IN_SET(value, "subsystem", "bus", "class")) {
if (!streq(value, "subsystem"))
LOG_RULE_WARNING("'%s' must be specified as 'subsystem'; please fix", value);
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);
} else if (streq(key, "DRIVER")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_DRIVER, op, value, NULL);
} else if (startswith(key, "ATTR{")) {
attr = get_key_attribute(key + STRLEN("ATTR"));
if (attr == NULL)
LOG_AND_RETURN("error parsing %s attribute", "ATTR");
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", "ATTR");
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);
} else if (startswith(key, "SYSCTL{")) {
attr = get_key_attribute(key + STRLEN("SYSCTL"));
if (attr == NULL)
LOG_AND_RETURN("error parsing %s attribute", "ATTR");
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", "ATTR");
if (op < OP_MATCH_MAX)
rule_add_key(&rule_tmp, TK_M_SYSCTL, op, value, attr);
else
rule_add_key(&rule_tmp, TK_A_SYSCTL, op, value, attr);
} else if (startswith(key, "SECLABEL{")) {
attr = get_key_attribute(key + STRLEN("SECLABEL"));
if (attr == NULL)
LOG_AND_RETURN("error parsing %s attribute", "SECLABEL");
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", "SECLABEL");
rule_add_key(&rule_tmp, TK_A_SECLABEL, op, value, attr);
} else if (streq(key, "KERNELS")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_KERNELS, op, value, NULL);
} else if (streq(key, "SUBSYSTEMS")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_SUBSYSTEMS, op, value, NULL);
} else if (streq(key, "DRIVERS")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_DRIVERS, op, value, NULL);
} else if (startswith(key, "ATTRS{")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", "ATTRS");
attr = get_key_attribute(key + STRLEN("ATTRS"));
if (attr == NULL)
LOG_AND_RETURN("error parsing %s attribute", "ATTRS");
if (startswith(attr, "device/"))
LOG_RULE_WARNING("'device' link may not be available in future kernels; please fix");
if (strstr(attr, "../") != NULL)
LOG_RULE_WARNING("direct reference to parent sysfs directory, may break in future kernels; please fix");
rule_add_key(&rule_tmp, TK_M_ATTRS, op, value, attr);
} else if (streq(key, "TAGS")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
} else if (startswith(key, "ENV{")) {
attr = get_key_attribute(key + STRLEN("ENV"));
if (attr == NULL)
LOG_AND_RETURN("error parsing %s attribute", "ENV");
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", "ENV");
if (op < OP_MATCH_MAX)
rule_add_key(&rule_tmp, TK_M_ENV, op, value, attr);
else {
if (STR_IN_SET(attr,
"ACTION",
"SUBSYSTEM",
"DEVTYPE",
"MAJOR",
"MINOR",
"DRIVER",
"IFINDEX",
"DEVNAME",
"DEVLINKS",
"DEVPATH",
"TAGS"))
LOG_AND_RETURN("invalid ENV attribute, '%s' cannot be set", attr);
rule_add_key(&rule_tmp, TK_A_ENV, op, value, attr);
}
} else if (streq(key, "TAG")) {
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);
} else if (streq(key, "PROGRAM")) {
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_PROGRAM, op, value, NULL);
} else if (streq(key, "RESULT")) {
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_M_RESULT, op, value, NULL);
} else if (startswith(key, "IMPORT")) {
attr = get_key_attribute(key + STRLEN("IMPORT"));
if (attr == NULL) {
LOG_RULE_WARNING("ignoring IMPORT{} with missing type");
continue;
}
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", "IMPORT");
if (streq(attr, "program")) {
/* find known built-in command */
if (value[0] != '/') {
const enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
if (cmd < UDEV_BUILTIN_MAX) {
LOG_RULE_DEBUG("IMPORT found builtin '%s', replacing", value);
rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
continue;
}
}
rule_add_key(&rule_tmp, TK_M_IMPORT_PROG, op, value, NULL);
} else if (streq(attr, "builtin")) {
const enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
if (cmd >= UDEV_BUILTIN_MAX)
LOG_RULE_WARNING("IMPORT{builtin} '%s' unknown", value);
else
rule_add_key(&rule_tmp, TK_M_IMPORT_BUILTIN, op, value, &cmd);
} else if (streq(attr, "file"))
rule_add_key(&rule_tmp, TK_M_IMPORT_FILE, op, value, NULL);
else if (streq(attr, "db"))
rule_add_key(&rule_tmp, TK_M_IMPORT_DB, op, value, NULL);
else if (streq(attr, "cmdline"))
rule_add_key(&rule_tmp, TK_M_IMPORT_CMDLINE, op, value, NULL);
else if (streq(attr, "parent"))
rule_add_key(&rule_tmp, TK_M_IMPORT_PARENT, op, value, NULL);
else
LOG_RULE_ERROR("ignoring unknown %s{} type '%s'", "IMPORT", attr);
} else if (startswith(key, "TEST")) {
mode_t mode = 0;
if (op > OP_MATCH_MAX)
LOG_AND_RETURN("invalid %s operation", "TEST");
attr = get_key_attribute(key + STRLEN("TEST"));
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);
} else if (startswith(key, "RUN")) {
attr = get_key_attribute(key + STRLEN("RUN"));
if (attr == NULL)
attr = "program";
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", "RUN");
if (streq(attr, "builtin")) {
const enum udev_builtin_cmd cmd = udev_builtin_lookup(value);
if (cmd < UDEV_BUILTIN_MAX)
rule_add_key(&rule_tmp, TK_A_RUN_BUILTIN, op, value, &cmd);
else
LOG_RULE_ERROR("RUN{builtin}: '%s' unknown", value);
} else if (streq(attr, "program")) {
const enum udev_builtin_cmd cmd = UDEV_BUILTIN_MAX;
rule_add_key(&rule_tmp, TK_A_RUN_PROGRAM, op, value, &cmd);
} else
LOG_RULE_ERROR("ignoring unknown %s{} type '%s'", "RUN", attr);
} else if (streq(key, "LABEL")) {
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", key);
rule_tmp.rule.rule.label_off = rules_add_string(rules, value);
} else if (streq(key, "GOTO")) {
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", key);
rule_add_key(&rule_tmp, TK_A_GOTO, 0, value, NULL);
} else if (startswith(key, "NAME")) {
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", key);
if (op < OP_MATCH_MAX)
rule_add_key(&rule_tmp, TK_M_NAME, op, value, NULL);
else {
if (streq(value, "%k")) {
LOG_RULE_WARNING("NAME=\"%%k\" is ignored, because it breaks kernel supplied names; please remove");
continue;
}
if (isempty(value)) {
LOG_RULE_DEBUG("NAME=\"\" is ignored, because udev will not delete any device nodes; please remove");
continue;
}
rule_add_key(&rule_tmp, TK_A_NAME, op, value, NULL);
}
rule_tmp.rule.rule.can_set_name = true;
} else if (streq(key, "SYMLINK")) {
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", key);
if (op < OP_MATCH_MAX)
rule_add_key(&rule_tmp, TK_M_DEVLINK, op, value, NULL);
else
rule_add_key(&rule_tmp, TK_A_DEVLINK, op, value, NULL);
rule_tmp.rule.rule.can_set_name = true;
} else if (streq(key, "OWNER")) {
uid_t uid;
char *endptr;
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", key);
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("$%", value[0]) == NULL) {
uid = add_uid(rules, value);
rule_add_key(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
} else if (rules->resolve_names >= 0)
rule_add_key(&rule_tmp, TK_A_OWNER, op, value, NULL);
rule_tmp.rule.rule.can_set_name = true;
} else if (streq(key, "GROUP")) {
gid_t gid;
char *endptr;
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", key);
gid = strtoul(value, &endptr, 10);
if (endptr[0] == '\0')
rule_add_key(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
else if ((rules->resolve_names > 0) && strchr("$%", 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.can_set_name = true;
} else if (streq(key, "MODE")) {
mode_t mode;
char *endptr;
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", key);
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.can_set_name = true;
} else if (streq(key, "OPTIONS")) {
const char *pos;
if (op == OP_REMOVE)
LOG_AND_RETURN("invalid %s operation", key);
pos = strstr(value, "link_priority=");
if (pos != NULL) {
int prio = atoi(pos + STRLEN("link_priority="));
rule_add_key(&rule_tmp, TK_A_DEVLINK_PRIO, op, NULL, &prio);
}
pos = strstr(value, "string_escape=");
if (pos != NULL) {
pos += STRLEN("string_escape=");
if (startswith(pos, "none"))
rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_NONE, op, NULL, NULL);
else if (startswith(pos, "replace"))
rule_add_key(&rule_tmp, TK_A_STRING_ESCAPE_REPLACE, op, NULL, NULL);
}
pos = strstr(value, "db_persist");
if (pos != NULL)
rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
pos = strstr(value, "nowatch");
if (pos) {
static const int zero = 0;
rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &zero);
} else {
static const int one = 1;
pos = strstr(value, "watch");
if (pos)
rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &one);
}
pos = strstr(value, "static_node=");
if (pos != NULL) {
pos += STRLEN("static_node=");
rule_add_key(&rule_tmp, TK_A_STATIC_NODE, op, pos, NULL);
rule_tmp.rule.rule.has_static_node = true;
}
} else
LOG_AND_RETURN("unknown key '%s'", key);
}
/* add rule token and sort tokens */
rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
if (add_token(rules, &rule_tmp.rule) != 0 || sort_token(rules, &rule_tmp) != 0)
LOG_RULE_ERROR("failed to add rule token");
}
static int parse_file(struct udev_rules *rules, const char *filename) {
_cleanup_fclose_ FILE *f = NULL;
unsigned first_token;
unsigned filename_off;
char line[UTIL_LINE_SIZE];
int line_nr = 0;
unsigned i;
f = fopen(filename, "re");
if (!f) {
if (errno == ENOENT)
return 0;
return -errno;
}
if (null_or_empty_fd(fileno(f))) {
log_debug("Skipping empty file: %s", filename);
return 0;
} else
log_debug("Reading rules file: %s", filename);
first_token = rules->token_cur;
filename_off = rules_add_string(rules, filename);
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)) {
log_error("line too long '%s':%u, ignored", filename, line_nr);
continue;
}
add_rule(rules, key, filename, filename_off, line_nr);
}
/* 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_str(rules, rules->tokens[i].key.value_off);
unsigned 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 (!streq(label, rules_str(rules, rules->tokens[j].rule.label_off)))
continue;
rules->tokens[i].key.rule_goto = j;
break;
}
if (rules->tokens[i].key.rule_goto == 0)
log_error("GOTO '%s' has no matching label in: '%s'", label, filename);
}
}
return 0;
}
struct udev_rules *udev_rules_new(int resolve_names) {
struct udev_rules *rules;
struct udev_list file_list;
struct token end_token;
char **files, **f;
int r;
rules = new0(struct udev_rules, 1);
if (rules == NULL)
return NULL;
rules->resolve_names = resolve_names;
udev_list_init(NULL, &file_list, true);
/* init token array and string buffer */
rules->tokens = malloc_multiply(PREALLOC_TOKEN, sizeof(struct token));
if (rules->tokens == NULL)
return udev_rules_unref(rules);
rules->token_max = PREALLOC_TOKEN;
rules->strbuf = strbuf_new();
if (!rules->strbuf)
return udev_rules_unref(rules);
udev_rules_check_timestamp(rules);
r = conf_files_list_strv(&files, ".rules", NULL, 0, rules_dirs);
if (r < 0) {
log_error_errno(r, "failed to enumerate rules files: %m");
return udev_rules_unref(rules);
}
/*
* The offset value in the rules strct is limited; add all
* rules file names to the beginning of the string buffer.
*/
STRV_FOREACH(f, files)
rules_add_string(rules, *f);
STRV_FOREACH(f, files)
parse_file(rules, *f);
strv_free(files);
memzero(&end_token, sizeof(struct token));
end_token.type = TK_END;
add_token(rules, &end_token);
log_debug("rules contain %zu bytes tokens (%u * %zu bytes), %zu bytes strings",
rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->strbuf->len);
/* cleanup temporary strbuf data */
log_debug("%zu strings (%zu bytes), %zu de-duplicated (%zu bytes), %zu trie nodes used",
rules->strbuf->in_count, rules->strbuf->in_len,
rules->strbuf->dedup_count, rules->strbuf->dedup_len, rules->strbuf->nodes_count);
strbuf_complete(rules->strbuf);
/* cleanup uid/gid cache */
rules->uids = mfree(rules->uids);
rules->uids_cur = 0;
rules->uids_max = 0;
rules->gids = mfree(rules->gids);
rules->gids_cur = 0;
rules->gids_max = 0;
dump_rules(rules);
return rules;
}
struct udev_rules *udev_rules_unref(struct udev_rules *rules) {
if (rules == NULL)
return NULL;
free(rules->tokens);
strbuf_cleanup(rules->strbuf);
free(rules->uids);
free(rules->gids);
return mfree(rules);
}
bool udev_rules_check_timestamp(struct udev_rules *rules) {
if (!rules)
return false;
return paths_check_timestamp(rules_dirs, &rules->dirs_ts_usec, true);
}
static int match_key(struct udev_rules *rules, struct token *token, const char *val) {
char *key_value = rules_str(rules, token->key.value_off);
char *pos;
bool match = false;
if (val == NULL)
val = "";
switch (token->key.glob) {
case GL_PLAIN:
match = (streq(key_value, val));
break;
case GL_GLOB:
match = (fnmatch(key_value, val, 0) == 0);
break;
case GL_SPLIT:
{
const char *s;
size_t len;
s = rules_str(rules, token->key.value_off);
len = strlen(val);
for (;;) {
const char *next;
next = strchr(s, '|');
if (next != NULL) {
size_t matchlen = (size_t)(next - s);
match = (matchlen == len && strneq(s, val, matchlen));
if (match)
break;
} else {
match = (streq(s, val));
break;
}
s = &next[1];
}
break;
}
case GL_SPLIT_GLOB:
{
char value[UTIL_PATH_SIZE];
strscpy(value, sizeof(value), rules_str(rules, token->key.value_off));
key_value = value;
while (key_value != NULL) {
pos = strchr(key_value, '|');
if (pos != NULL) {
pos[0] = '\0';
pos = &pos[1];
}
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))
return 0;
if (!match && (token->key.op == OP_NOMATCH))
return 0;
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_str(rules, cur->key.attr_off);
switch (cur->key.attrsubst) {
case SB_FORMAT:
udev_event_apply_format(event, name, nbuf, sizeof(nbuf), false);
name = nbuf;
_fallthrough_;
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(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_str(rules, cur->key.value_off);
klen = strlen(key_value);
if (klen > 0 && !isspace(key_value[klen-1])) {
if (value != vbuf) {
strscpy(vbuf, sizeof(vbuf), value);
value = vbuf;
}
while (len > 0 && isspace(vbuf[--len]))
vbuf[len] = '\0';
}
}
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,
usec_t timeout_usec,
usec_t timeout_warn_usec,
Hashmap *properties_list) {
struct token *cur;
struct token *rule;
enum escape_type esc = ESCAPE_UNSET;
bool can_set_name;
int r;
if (!rules->tokens)
return 0;
can_set_name = ((!streq(udev_device_get_action(event->dev), "remove")) &&
(major(udev_device_get_devnum(event->dev)) > 0 ||
udev_device_get_ifindex(event->dev) > 0));
/* loop through token list, match, run actions or forward to next rule */
cur = &rules->tokens[0];
rule = cur;
for (;;) {
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.can_set_name)
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: {
struct udev_list_entry *list_entry;
bool match = false;
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) + STRLEN("/dev/");
if (match_key(rules, cur, devlink) == 0) {
match = true;
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_str(rules, cur->key.attr_off);
const char *value;
value = udev_device_get_property_value(event->dev, key_name);
/* check global properties */
if (!value && properties_list)
value = hashmap_get(properties_list, key_name);
if (match_key(rules, cur, strempty(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 (streq(rules_str(rules, cur->key.value_off), udev_list_entry_get_name(list_entry))) {
match = true;
break;
}
}
if ((!match && (cur->key.op != OP_NOMATCH)) ||
(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_ATTR:
if (match_attr(rules, event->dev, event, cur) != 0)
goto nomatch;
break;
case TK_M_SYSCTL: {
char filename[UTIL_PATH_SIZE];
_cleanup_free_ char *value = NULL;
size_t len;
udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename), false);
sysctl_normalize(filename);
if (sysctl_read(filename, &value) < 0)
goto nomatch;
len = strlen(value);
while (len > 0 && isspace(value[--len]))
value[len] = '\0';
if (match_key(rules, cur, value) != 0)
goto nomatch;
break;
}
case TK_M_KERNELS:
case TK_M_SUBSYSTEMS:
case TK_M_DRIVERS:
case TK_M_ATTRS:
case TK_M_TAGS: {
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;
for (;;) {
struct token *key;
/* 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;
case TK_M_TAGS: {
bool match = udev_device_has_tag(event->dev_parent, rules_str(rules, cur->key.value_off));
if (match && key->key.op == OP_NOMATCH)
goto try_parent;
if (!match && key->key.op == OP_MATCH)
goto try_parent;
break;
}
default:
goto nomatch;
}
}
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_str(rules, cur->key.value_off), filename, sizeof(filename), false);
if (util_resolve_subsys_kernel(filename, filename, sizeof(filename), 0) != 0) {
if (filename[0] != '/') {
char tmp[UTIL_PATH_SIZE];
strscpy(tmp, sizeof(tmp), filename);
strscpyl(filename, sizeof(filename),
udev_device_get_syspath(event->dev), "/", tmp, NULL);
}
}
attr_subst_subdir(filename, sizeof(filename));
match = (stat(filename, &statbuf) == 0);
if (match && cur->key.mode > 0)
match = ((statbuf.st_mode & cur->key.mode) > 0);
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 result[UTIL_LINE_SIZE];
event->program_result = mfree(event->program_result);
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), program, sizeof(program), false);
log_debug("PROGRAM '%s' %s:%u",
program,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
if (udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, result, sizeof(result)) < 0) {
if (cur->key.op != OP_NOMATCH)
goto nomatch;
} else {
int count;
delete_trailing_chars(result, "\n");
if (IN_SET(esc, ESCAPE_UNSET, ESCAPE_REPLACE)) {
count = util_replace_chars(result, UDEV_ALLOWED_CHARS_INPUT);
if (count > 0)
log_debug("%i character(s) replaced" , count);
}
event->program_result = strdup(result);
if (cur->key.op == OP_NOMATCH)
goto nomatch;
}
break;
}
case TK_M_IMPORT_FILE: {
char import[UTIL_PATH_SIZE];
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import), false);
if (import_file_into_properties(event->dev, import) != 0)
if (cur->key.op != OP_NOMATCH)
goto nomatch;
break;
}
case TK_M_IMPORT_PROG: {
char import[UTIL_PATH_SIZE];
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import), false);
log_debug("IMPORT '%s' %s:%u",
import,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
if (import_program_into_properties(event, timeout_usec, timeout_warn_usec, import) != 0)
if (cur->key.op != OP_NOMATCH)
goto nomatch;
break;
}
case TK_M_IMPORT_BUILTIN: {
char command[UTIL_PATH_SIZE];
if (udev_builtin_run_once(cur->key.builtin_cmd)) {
/* check if we ran already */
if (event->builtin_run & (1 << cur->key.builtin_cmd)) {
log_debug("IMPORT builtin skip '%s' %s:%u",
udev_builtin_name(cur->key.builtin_cmd),
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
/* return the result from earlier run */
if (event->builtin_ret & (1 << cur->key.builtin_cmd))
if (cur->key.op != OP_NOMATCH)
goto nomatch;
break;
}
/* mark as ran */
event->builtin_run |= (1 << cur->key.builtin_cmd);
}
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), command, sizeof(command), false);
log_debug("IMPORT builtin '%s' %s:%u",
udev_builtin_name(cur->key.builtin_cmd),
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
if (udev_builtin_run(event->dev, cur->key.builtin_cmd, command, false) != 0) {
/* remember failure */
log_debug("IMPORT builtin '%s' returned non-zero",
udev_builtin_name(cur->key.builtin_cmd));
event->builtin_ret |= (1 << cur->key.builtin_cmd);
if (cur->key.op != OP_NOMATCH)
goto nomatch;
}
break;
}
case TK_M_IMPORT_DB: {
const char *key = rules_str(rules, cur->key.value_off);
const char *value;
value = udev_device_get_property_value(event->dev_db, key);
if (value != NULL)
udev_device_add_property(event->dev, key, value);
else {
if (cur->key.op != OP_NOMATCH)
goto nomatch;
}
break;
}
case TK_M_IMPORT_CMDLINE: {
_cleanup_free_ char *value = NULL;
bool imported = false;
const char *key;
key = rules_str(rules, cur->key.value_off);
r = proc_cmdline_get_key(key, PROC_CMDLINE_VALUE_OPTIONAL, &value);
if (r < 0)
log_debug_errno(r, "Failed to read %s from /proc/cmdline, ignoring: %m", key);
else if (r > 0) {
imported = true;
if (value)
udev_device_add_property(event->dev, key, value);
else
/* we import simple flags as 'FLAG=1' */
udev_device_add_property(event->dev, key, "1");
}
if (!imported && cur->key.op != OP_NOMATCH)
goto nomatch;
break;
}
case TK_M_IMPORT_PARENT: {
char import[UTIL_PATH_SIZE];
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), import, sizeof(import), false);
if (import_parent_into_properties(event->dev, import) != 0)
if (cur->key.op != OP_NOMATCH)
goto nomatch;
break;
}
case TK_M_RESULT:
if (match_key(rules, cur, event->program_result) != 0)
goto nomatch;
break;
case TK_A_STRING_ESCAPE_NONE:
esc = ESCAPE_NONE;
break;
case TK_A_STRING_ESCAPE_REPLACE:
esc = ESCAPE_REPLACE;
break;
case TK_A_DB_PERSIST:
udev_device_set_db_persist(event->dev);
break;
case TK_A_INOTIFY_WATCH:
if (event->inotify_watch_final)
break;
if (cur->key.op == OP_ASSIGN_FINAL)
event->inotify_watch_final = true;
event->inotify_watch = cur->key.watch;
break;
case TK_A_DEVLINK_PRIO:
udev_device_set_devlink_priority(event->dev, cur->key.devlink_prio);
break;
case TK_A_OWNER: {
char owner[UTIL_NAME_SIZE];
const char *ow = owner;
if (event->owner_final)
break;
if (cur->key.op == OP_ASSIGN_FINAL)
event->owner_final = true;
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), owner, sizeof(owner), false);
event->owner_set = true;
r = get_user_creds(&ow, &event->uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
if (r < 0) {
log_unknown_owner(r, "user", owner);
event->uid = 0;
}
log_debug("OWNER %u %s:%u",
event->uid,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
}
case TK_A_GROUP: {
char group[UTIL_NAME_SIZE];
const char *gr = group;
if (event->group_final)
break;
if (cur->key.op == OP_ASSIGN_FINAL)
event->group_final = true;
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), group, sizeof(group), false);
event->group_set = true;
r = get_group_creds(&gr, &event->gid, USER_CREDS_ALLOW_MISSING);
if (r < 0) {
log_unknown_owner(r, "group", group);
event->gid = 0;
}
log_debug("GROUP %u %s:%u",
event->gid,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
}
case TK_A_MODE: {
char mode_str[UTIL_NAME_SIZE];
mode_t mode;
char *endptr;
if (event->mode_final)
break;
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), mode_str, sizeof(mode_str), false);
mode = strtol(mode_str, &endptr, 8);
if (endptr[0] != '\0') {
log_error("ignoring invalid mode '%s'", mode_str);
break;
}
if (cur->key.op == OP_ASSIGN_FINAL)
event->mode_final = true;
event->mode_set = true;
event->mode = mode;
log_debug("MODE %#o %s:%u",
event->mode,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
}
case TK_A_OWNER_ID:
if (event->owner_final)
break;
if (cur->key.op == OP_ASSIGN_FINAL)
event->owner_final = true;
event->owner_set = true;
event->uid = cur->key.uid;
log_debug("OWNER %u %s:%u",
event->uid,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
case TK_A_GROUP_ID:
if (event->group_final)
break;
if (cur->key.op == OP_ASSIGN_FINAL)
event->group_final = true;
event->group_set = true;
event->gid = cur->key.gid;
log_debug("GROUP %u %s:%u",
event->gid,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
case TK_A_MODE_ID:
if (event->mode_final)
break;
if (cur->key.op == OP_ASSIGN_FINAL)
event->mode_final = true;
event->mode_set = true;
event->mode = cur->key.mode;
log_debug("MODE %#o %s:%u",
event->mode,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
case TK_A_SECLABEL: {
_cleanup_free_ char *name = NULL, *label = NULL;
char label_str[UTIL_LINE_SIZE] = {};
name = strdup(rules_str(rules, cur->key.attr_off));
if (!name)
return log_oom();
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), label_str, sizeof(label_str), false);
if (!isempty(label_str))
label = strdup(label_str);
else
label = strdup(rules_str(rules, cur->key.value_off));
if (!label)
return log_oom();
if (IN_SET(cur->key.op, OP_ASSIGN, OP_ASSIGN_FINAL))
hashmap_clear_free_free(event->seclabel_list);
r = hashmap_ensure_allocated(&event->seclabel_list, NULL);
if (r < 0)
return log_oom();
r = hashmap_put(event->seclabel_list, name, label);
if (r < 0)
return log_oom();
name = label = NULL;
log_debug("SECLABEL{%s}='%s' %s:%u",
name, label,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
}
case TK_A_ENV: {
const char *name = rules_str(rules, cur->key.attr_off);
char *value = rules_str(rules, cur->key.value_off);
char value_new[UTIL_NAME_SIZE];
const char *value_old = NULL;
if (value[0] == '\0') {
if (cur->key.op == OP_ADD)
break;
udev_device_add_property(event->dev, name, NULL);
break;
}
if (cur->key.op == OP_ADD)
value_old = udev_device_get_property_value(event->dev, name);
if (value_old) {
char temp[UTIL_NAME_SIZE];
/* append value separated by space */
udev_event_apply_format(event, value, temp, sizeof(temp), false);
strscpyl(value_new, sizeof(value_new), value_old, " ", temp, NULL);
} else
udev_event_apply_format(event, value, value_new, sizeof(value_new), false);
udev_device_add_property(event->dev, name, value_new);
break;
}
case TK_A_TAG: {
char tag[UTIL_PATH_SIZE];
const char *p;
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), tag, sizeof(tag), false);
if (IN_SET(cur->key.op, OP_ASSIGN, OP_ASSIGN_FINAL))
udev_device_cleanup_tags_list(event->dev);
for (p = tag; *p != '\0'; p++) {
if ((*p >= 'a' && *p <= 'z') ||
(*p >= 'A' && *p <= 'Z') ||
(*p >= '0' && *p <= '9') ||
IN_SET(*p, '-', '_'))
continue;
log_error("ignoring invalid tag name '%s'", tag);
break;
}
if (cur->key.op == OP_REMOVE)
udev_device_remove_tag(event->dev, tag);
else
udev_device_add_tag(event->dev, tag);
break;
}
case TK_A_NAME: {
const char *name = rules_str(rules, cur->key.value_off);
char name_str[UTIL_PATH_SIZE];
int count;
if (event->name_final)
break;
if (cur->key.op == OP_ASSIGN_FINAL)
event->name_final = true;
udev_event_apply_format(event, name, name_str, sizeof(name_str), false);
if (IN_SET(esc, ESCAPE_UNSET, ESCAPE_REPLACE)) {
count = util_replace_chars(name_str, "/");
if (count > 0)
log_debug("%i character(s) replaced", count);
}
if (major(udev_device_get_devnum(event->dev)) &&
!streq(name_str, udev_device_get_devnode(event->dev) + STRLEN("/dev/"))) {
log_error("NAME=\"%s\" ignored, kernel device nodes cannot be renamed; please fix it in %s:%u\n",
name,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
}
if (free_and_strdup(&event->name, name_str) < 0)
return log_oom();
log_debug("NAME '%s' %s:%u",
event->name,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
}
case TK_A_DEVLINK: {
char temp[UTIL_PATH_SIZE];
char filename[UTIL_PATH_SIZE];
char *pos, *next;
int count = 0;
if (event->devlink_final)
break;
if (major(udev_device_get_devnum(event->dev)) == 0)
break;
if (cur->key.op == OP_ASSIGN_FINAL)
event->devlink_final = true;
if (IN_SET(cur->key.op, OP_ASSIGN, OP_ASSIGN_FINAL))
udev_device_cleanup_devlinks_list(event->dev);
/* allow multiple symlinks separated by spaces */
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), temp, sizeof(temp), esc != ESCAPE_NONE);
if (esc == ESCAPE_UNSET)
count = util_replace_chars(temp, "/ ");
else if (esc == ESCAPE_REPLACE)
count = util_replace_chars(temp, "/");
if (count > 0)
log_debug("%i character(s) replaced" , count);
pos = temp;
while (isspace(pos[0]))
pos++;
next = strchr(pos, ' ');
while (next != NULL) {
next[0] = '\0';
log_debug("LINK '%s' %s:%u", pos,
rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
udev_device_add_devlink(event->dev, filename);
while (isspace(next[1]))
next++;
pos = &next[1];
next = strchr(pos, ' ');
}
if (pos[0] != '\0') {
log_debug("LINK '%s' %s:%u", pos,
rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
strscpyl(filename, sizeof(filename), "/dev/", pos, NULL);
udev_device_add_devlink(event->dev, filename);
}
break;
}
case TK_A_ATTR: {
const char *key_name = rules_str(rules, cur->key.attr_off);
char attr[UTIL_PATH_SIZE];
char value[UTIL_NAME_SIZE];
_cleanup_fclose_ FILE *f = NULL;
if (util_resolve_subsys_kernel(key_name, attr, sizeof(attr), 0) != 0)
strscpyl(attr, sizeof(attr), udev_device_get_syspath(event->dev), "/", key_name, NULL);
attr_subst_subdir(attr, sizeof(attr));
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value), false);
log_debug("ATTR '%s' writing '%s' %s:%u", attr, value,
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
f = fopen(attr, "we");
if (f == NULL)
log_error_errno(errno, "error opening ATTR{%s} for writing: %m", attr);
else if (fprintf(f, "%s", value) <= 0)
log_error_errno(errno, "error writing ATTR{%s}: %m", attr);
break;
}
case TK_A_SYSCTL: {
char filename[UTIL_PATH_SIZE];
char value[UTIL_NAME_SIZE];
udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename), false);
sysctl_normalize(filename);
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value), false);
log_debug("SYSCTL '%s' writing '%s' %s:%u", filename, value,
rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
r = sysctl_write(filename, value);
if (r < 0)
log_error_errno(r, "error writing SYSCTL{%s}='%s': %m", filename, value);
break;
}
case TK_A_RUN_BUILTIN:
case TK_A_RUN_PROGRAM: {
_cleanup_free_ char *cmd = NULL;
if (IN_SET(cur->key.op, OP_ASSIGN, OP_ASSIGN_FINAL)) {
void *p;
while ((p = hashmap_steal_first_key(event->run_list)))
free(p);
}
r = hashmap_ensure_allocated(&event->run_list, NULL);
if (r < 0)
return log_oom();
cmd = strdup(rules_str(rules, cur->key.value_off));
if (!cmd)
return log_oom();
r = hashmap_put(event->run_list, cmd, INT_TO_PTR(cur->key.builtin_cmd));
if (r < 0)
return log_oom();
cmd = NULL;
log_debug("RUN '%s' %s:%u",
rules_str(rules, cur->key.value_off),
rules_str(rules, rule->rule.filename_off),
rule->rule.filename_line);
break;
}
case TK_A_GOTO:
if (cur->key.rule_goto == 0)
break;
cur = &rules->tokens[cur->key.rule_goto];
continue;
case TK_END:
return 0;
case TK_M_PARENTS_MIN:
case TK_M_PARENTS_MAX:
case TK_M_MAX:
case TK_UNSET:
log_error("wrong type %u", cur->type);
goto nomatch;
}
cur++;
continue;
nomatch:
/* fast-forward to next rule */
cur = rule + rule->rule.token_count;
}
return 0;
}
int udev_rules_apply_static_dev_perms(struct udev_rules *rules) {
struct token *cur;
struct token *rule;
uid_t uid = 0;
gid_t gid = 0;
mode_t mode = 0;
_cleanup_strv_free_ char **tags = NULL;
char **t;
FILE *f = NULL;
_cleanup_free_ char *path = NULL;
int r;
if (rules->tokens == NULL)
return 0;
cur = &rules->tokens[0];
rule = cur;
for (;;) {
switch (cur->type) {
case TK_RULE:
/* current rule */
rule = cur;
/* skip rules without a static_node tag */
if (!rule->rule.has_static_node)
goto next;
uid = 0;
gid = 0;
mode = 0;
tags = strv_free(tags);
break;
case TK_A_OWNER_ID:
uid = cur->key.uid;
break;
case TK_A_GROUP_ID:
gid = cur->key.gid;
break;
case TK_A_MODE_ID:
mode = cur->key.mode;
break;
case TK_A_TAG:
r = strv_extend(&tags, rules_str(rules, cur->key.value_off));
if (r < 0)
goto finish;
break;
case TK_A_STATIC_NODE: {
char device_node[UTIL_PATH_SIZE];
char tags_dir[UTIL_PATH_SIZE];
char tag_symlink[UTIL_PATH_SIZE];
struct stat stats;
/* we assure, that the permissions tokens are sorted before the static token */
if (mode == 0 && uid == 0 && gid == 0 && tags == NULL)
goto next;
strscpyl(device_node, sizeof(device_node), "/dev/", rules_str(rules, cur->key.value_off), NULL);
if (stat(device_node, &stats) != 0)
break;
if (!S_ISBLK(stats.st_mode) && !S_ISCHR(stats.st_mode))
break;
/* export the tags to a directory as symlinks, allowing otherwise dead nodes to be tagged */
if (tags) {
STRV_FOREACH(t, tags) {
_cleanup_free_ char *unescaped_filename = NULL;
strscpyl(tags_dir, sizeof(tags_dir), "/run/udev/static_node-tags/", *t, "/", NULL);
r = mkdir_p(tags_dir, 0755);
if (r < 0)
return log_error_errno(r, "failed to create %s: %m", tags_dir);
unescaped_filename = xescape(rules_str(rules, cur->key.value_off), "/.");
strscpyl(tag_symlink, sizeof(tag_symlink), tags_dir, unescaped_filename, NULL);
r = symlink(device_node, tag_symlink);
if (r < 0 && errno != EEXIST)
return log_error_errno(errno, "failed to create symlink %s -> %s: %m",
tag_symlink, device_node);
}
}
/* don't touch the permissions if only the tags were set */
if (mode == 0 && uid == 0 && gid == 0)
break;
if (mode == 0) {
if (gid > 0)
mode = 0660;
else
mode = 0600;
}
if (mode != (stats.st_mode & 01777)) {
r = chmod(device_node, mode);
if (r < 0)
return log_error_errno(errno, "Failed to chmod '%s' %#o: %m",
device_node, mode);
else
log_debug("chmod '%s' %#o", device_node, mode);
}
if ((uid != 0 && uid != stats.st_uid) || (gid != 0 && gid != stats.st_gid)) {
r = chown(device_node, uid, gid);
if (r < 0)
return log_error_errno(errno, "Failed to chown '%s' %u %u: %m",
device_node, uid, gid);
else
log_debug("chown '%s' %u %u", device_node, uid, gid);
}
utimensat(AT_FDCWD, device_node, NULL, 0);
break;
}
case TK_END:
goto finish;
}
cur++;
continue;
next:
/* fast-forward to next rule */
cur = rule + rule->rule.token_count;
continue;
}
finish:
if (f) {
fflush(f);
fchmod(fileno(f), 0644);
if (ferror(f) || rename(path, "/run/udev/static_node-tags") < 0) {
unlink_noerrno("/run/udev/static_node-tags");
unlink_noerrno(path);
return -errno;
}
}
return 0;
}
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