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merge udev-rules.c and udev-rules-parse.c

This commit is contained in:
Kay Sievers 2008-10-18 14:33:37 +02:00
parent bec02e3304
commit c7521974a3
10 changed files with 950 additions and 1025 deletions
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2
udev/Makefile.am
View File

@ -14,12 +14,10 @@ common_ldadd =
common_files = \
udev.h \
udev-rules.h \
udev-sysdeps.h \
udev-event.c \
udev-node.c \
udev-rules.c \
udev-rules-parse.c \
udev-util.c \
lib/libudev.h \
lib/libudev-private.h \

1
udev/test-udev.c
View File

@ -29,7 +29,6 @@
#include <grp.h>
#include "udev.h"
#include "udev-rules.h"
static void asmlinkage sig_handler(int signum)
{

1
udev/udev-event.c
View File

@ -29,7 +29,6 @@
#include <linux/sockios.h>
#include "udev.h"
#include "udev-rules.h"
struct udev_event *udev_event_new(struct udev_device *dev)
{

1
udev/udev-node.c
View File

@ -28,7 +28,6 @@
#include <sys/types.h>
#include "udev.h"
#include "udev-rules.h"
#define TMP_FILE_EXT ".udev-tmp"

876
udev/udev-rules-parse.c
View File

@ -1,876 +0,0 @@
/*
* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2003-2008 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <sys/stat.h>
#include "udev.h"
#include "udev-rules.h"
void udev_rules_iter_init(struct udev_rules_iter *iter, struct udev_rules *rules)
{
dbg(rules->udev, "bufsize=%zi\n", rules->bufsize);
iter->rules = rules;
iter->current = 0;
}
struct udev_rule *udev_rules_iter_next(struct udev_rules_iter *iter)
{
struct udev_rules *rules;
struct udev_rule *rule;
rules = iter->rules;
if (!rules)
return NULL;
dbg(rules->udev, "current=%zi\n", iter->current);
if (iter->current >= rules->bufsize) {
dbg(rules->udev, "no more rules\n");
return NULL;
}
/* get next rule */
rule = (struct udev_rule *) (rules->buf + iter->current);
iter->current += sizeof(struct udev_rule) + rule->bufsize;
return rule;
}
struct udev_rule *udev_rules_iter_goto(struct udev_rules_iter *iter, size_t rule_off)
{
struct udev_rules *rules = iter->rules;
struct udev_rule *rule;
dbg(rules->udev, "current=%zi\n", iter->current);
iter->current = rule_off;
rule = (struct udev_rule *) (rules->buf + iter->current);
return rule;
}
static size_t find_label(const struct udev_rules_iter *iter, const char *label)
{
struct udev_rule *rule;
struct udev_rules *rules = iter->rules;
size_t current = iter->current;
next:
dbg(rules->udev, "current=%zi\n", current);
if (current >= rules->bufsize) {
dbg(rules->udev, "LABEL='%s' not found\n", label);
return 0;
}
rule = (struct udev_rule *) (rules->buf + current);
if (strcmp(&rule->buf[rule->label.val_off], label) != 0) {
dbg(rules->udev, "moving forward, looking for label '%s'\n", label);
current += sizeof(struct udev_rule) + rule->bufsize;
goto next;
}
dbg(rules->udev, "found label '%s'\n", label);
return current;
}
static int get_key(struct udev_rules *rules, char **line, char **key, enum key_operation *operation, 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] == '=') {
*operation = KEY_OP_MATCH;
linepos += 2;
dbg(rules->udev, "match:\n");
} else if (linepos[0] == '!' && linepos[1] == '=') {
*operation = KEY_OP_NOMATCH;
linepos += 2;
dbg(rules->udev, "nomatch:\n");
} else if (linepos[0] == '+' && linepos[1] == '=') {
*operation = KEY_OP_ADD;
linepos += 2;
dbg(rules->udev, "add:\n");
} else if (linepos[0] == '=') {
*operation = KEY_OP_ASSIGN;
linepos++;
dbg(rules->udev, "assign:\n");
} else if (linepos[0] == ':' && linepos[1] == '=') {
*operation = KEY_OP_ASSIGN_FINAL;
linepos += 2;
dbg(rules->udev, "assign_final:\n");
} 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;
temp = strchr(linepos, '"');
if (!temp)
return -1;
temp[0] = '\0';
temp++;
dbg(rules->udev, "'%s'-'%s'\n", *key, *value);
/* move line to next key */
*line = temp;
return 0;
}
/* extract possible KEY{attr} */
static char *get_key_attribute(struct udev_rules *rules, char *str)
{
char *pos;
char *attr;
attr = strchr(str, '{');
if (attr != NULL) {
attr++;
pos = strchr(attr, '}');
if (pos == NULL) {
err(rules->udev, "missing closing brace for format\n");
return NULL;
}
pos[0] = '\0';
dbg(rules->udev, "attribute='%s'\n", attr);
return attr;
}
return NULL;
}
static int add_rule_key(struct udev_rule *rule, struct key *key,
enum key_operation operation, const char *value)
{
size_t val_len = strnlen(value, UTIL_PATH_SIZE);
key->operation = operation;
key->val_off = rule->bufsize;
util_strlcpy(rule->buf + rule->bufsize, value, val_len+1);
rule->bufsize += val_len+1;
return 0;
}
static int add_rule_key_pair(struct udev_rules *rules, struct udev_rule *rule, struct key_pairs *pairs,
enum key_operation operation, const char *key, const char *value)
{
size_t key_len = strnlen(key, UTIL_PATH_SIZE);
if (pairs->count >= PAIRS_MAX) {
err(rules->udev, "skip, too many keys of the same type in a single rule\n");
return -1;
}
add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
/* add the key-name of the pair */
pairs->keys[pairs->count].key_name_off = rule->bufsize;
util_strlcpy(rule->buf + rule->bufsize, key, key_len+1);
rule->bufsize += key_len+1;
pairs->count++;
return 0;
}
static int add_to_rules(struct udev_rules *rules, char *line, const char *filename, unsigned int lineno)
{
char buf[sizeof(struct udev_rule) + UTIL_LINE_SIZE];
struct udev_rule *rule;
size_t rule_size;
int valid;
char *linepos;
char *attr;
size_t padding;
int physdev = 0;
int retval;
memset(buf, 0x00, sizeof(buf));
rule = (struct udev_rule *) buf;
rule->event_timeout = -1;
linepos = line;
valid = 0;
/* get all the keys */
while (1) {
char *key;
char *value;
enum key_operation operation = KEY_OP_UNSET;
retval = get_key(rules, &linepos, &key, &operation, &value);
if (retval)
break;
if (strcasecmp(key, "ACTION") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid ACTION operation\n");
goto invalid;
}
add_rule_key(rule, &rule->action, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "DEVPATH") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid DEVPATH operation\n");
goto invalid;
}
add_rule_key(rule, &rule->devpath, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "KERNEL") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid KERNEL operation\n");
goto invalid;
}
add_rule_key(rule, &rule->kernel, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "SUBSYSTEM") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
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);
add_rule_key(rule, &rule->subsystem, operation, "subsystem|class|bus");
} else
add_rule_key(rule, &rule->subsystem, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "DRIVER") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid DRIVER operation\n");
goto invalid;
}
add_rule_key(rule, &rule->driver, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("ATTR")-1);
if (attr == NULL) {
err(rules->udev, "error parsing ATTR attribute\n");
goto invalid;
}
if (add_rule_key_pair(rules, rule, &rule->attr, operation, attr, value) != 0)
goto invalid;
valid = 1;
continue;
}
if (strcasecmp(key, "KERNELS") == 0 ||
strcasecmp(key, "ID") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid KERNELS operation\n");
goto invalid;
}
add_rule_key(rule, &rule->kernels, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
strcasecmp(key, "BUS") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid SUBSYSTEMS operation\n");
goto invalid;
}
add_rule_key(rule, &rule->subsystems, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "DRIVERS") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid DRIVERS operation\n");
goto invalid;
}
add_rule_key(rule, &rule->drivers, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid ATTRS operation\n");
goto invalid;
}
attr = get_key_attribute(rules, 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 is deprecated and will be removed from a future kernel, \n"
"please fix it in %s:%u", filename, lineno);
else if (strstr(attr, "../") != NULL)
err(rules->udev, "do not reference parent sysfs directories directly, that may break with a future kernel, \n"
"please fix it in %s:%u", filename, lineno);
if (add_rule_key_pair(rules, rule, &rule->attrs, operation, attr, value) != 0)
goto invalid;
valid = 1;
continue;
}
if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("ENV")-1);
if (attr == NULL) {
err(rules->udev, "error parsing ENV attribute\n");
goto invalid;
}
if (strncmp(attr, "PHYSDEV", 7) == 0)
physdev = 1;
if (add_rule_key_pair(rules, rule, &rule->env, operation, attr, value) != 0)
goto invalid;
valid = 1;
continue;
}
if (strcasecmp(key, "PROGRAM") == 0) {
add_rule_key(rule, &rule->program, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "RESULT") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid RESULT operation\n");
goto invalid;
}
add_rule_key(rule, &rule->result, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("IMPORT")-1);
if (attr != NULL && strstr(attr, "program")) {
dbg(rules->udev, "IMPORT will be executed\n");
rule->import_type = IMPORT_PROGRAM;
} else if (attr != NULL && strstr(attr, "file")) {
dbg(rules->udev, "IMPORT will be included as file\n");
rule->import_type = IMPORT_FILE;
} else if (attr != NULL && strstr(attr, "parent")) {
dbg(rules->udev, "IMPORT will include the parent values\n");
rule->import_type = IMPORT_PARENT;
} else {
/* figure it out if it is executable */
char file[UTIL_PATH_SIZE];
char *pos;
struct stat statbuf;
util_strlcpy(file, value, sizeof(file));
pos = strchr(file, ' ');
if (pos)
pos[0] = '\0';
/* allow programs in /lib/udev called without the path */
if (strchr(file, '/') == NULL) {
util_strlcpy(file, UDEV_PREFIX "/lib/udev/", sizeof(file));
util_strlcat(file, value, sizeof(file));
pos = strchr(file, ' ');
if (pos)
pos[0] = '\0';
}
dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
if (!lstat(file, &statbuf) && (statbuf.st_mode & S_IXUSR)) {
dbg(rules->udev, "IMPORT is executable, will be executed (autotype)\n");
rule->import_type = IMPORT_PROGRAM;
} else {
dbg(rules->udev, "IMPORT is not executable, will be included as file (autotype)\n");
rule->import_type = IMPORT_FILE;
}
}
add_rule_key(rule, &rule->import, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid TEST operation\n");
goto invalid;
}
attr = get_key_attribute(rules, key + sizeof("TEST")-1);
if (attr != NULL)
rule->test_mode_mask = strtol(attr, NULL, 8);
add_rule_key(rule, &rule->test, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("RUN")-1);
if (attr != NULL) {
if (strstr(attr, "ignore_error"))
rule->run_ignore_error = 1;
}
add_rule_key(rule, &rule->run, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "WAIT_FOR") == 0 || strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
add_rule_key(rule, &rule->wait_for, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "LABEL") == 0) {
add_rule_key(rule, &rule->label, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "GOTO") == 0) {
add_rule_key(rule, &rule->goto_label, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("NAME")-1);
if (attr != NULL) {
if (strstr(attr, "all_partitions") != NULL) {
dbg(rules->udev, "creation of partition nodes requested\n");
rule->partitions = DEFAULT_PARTITIONS_COUNT;
}
if (strstr(attr, "ignore_remove") != NULL) {
dbg(rules->udev, "remove event should be ignored\n");
rule->ignore_remove = 1;
}
}
if (value[0] == '\0')
dbg(rules->udev, "name empty, node creation supressed\n");
add_rule_key(rule, &rule->name, operation, value);
continue;
}
if (strcasecmp(key, "SYMLINK") == 0) {
if (operation == KEY_OP_MATCH ||
operation == KEY_OP_NOMATCH)
add_rule_key(rule, &rule->symlink_match, operation, value);
else
add_rule_key(rule, &rule->symlink, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "OWNER") == 0) {
valid = 1;
if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
char *endptr;
strtoul(value, &endptr, 10);
if (endptr[0] != '\0') {
char owner[32];
uid_t uid = lookup_user(rules->udev, value);
dbg(rules->udev, "replacing username='%s' by id=%i\n", value, uid);
sprintf(owner, "%u", (unsigned int) uid);
add_rule_key(rule, &rule->owner, operation, owner);
continue;
}
}
add_rule_key(rule, &rule->owner, operation, value);
continue;
}
if (strcasecmp(key, "GROUP") == 0) {
valid = 1;
if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
char *endptr;
strtoul(value, &endptr, 10);
if (endptr[0] != '\0') {
char group[32];
gid_t gid = lookup_group(rules->udev, value);
dbg(rules->udev, "replacing groupname='%s' by id=%i\n", value, gid);
sprintf(group, "%u", (unsigned int) gid);
add_rule_key(rule, &rule->group, operation, group);
continue;
}
}
add_rule_key(rule, &rule->group, operation, value);
continue;
}
if (strcasecmp(key, "MODE") == 0) {
add_rule_key(rule, &rule->mode, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "OPTIONS") == 0) {
const char *pos;
if (strstr(value, "last_rule") != NULL) {
dbg(rules->udev, "last rule to be applied\n");
rule->last_rule = 1;
}
if (strstr(value, "ignore_device") != NULL) {
dbg(rules->udev, "device should be ignored\n");
rule->ignore_device = 1;
}
if (strstr(value, "ignore_remove") != NULL) {
dbg(rules->udev, "remove event should be ignored\n");
rule->ignore_remove = 1;
}
pos = strstr(value, "link_priority=");
if (pos != NULL) {
rule->link_priority = atoi(&pos[strlen("link_priority=")]);
dbg(rules->udev, "link priority=%i\n", rule->link_priority);
}
pos = strstr(value, "event_timeout=");
if (pos != NULL) {
rule->event_timeout = atoi(&pos[strlen("event_timeout=")]);
dbg(rules->udev, "event timout=%i\n", rule->event_timeout);
}
pos = strstr(value, "string_escape=");
if (pos != NULL) {
pos = &pos[strlen("string_escape=")];
if (strncmp(pos, "none", strlen("none")) == 0)
rule->string_escape = ESCAPE_NONE;
else if (strncmp(pos, "replace", strlen("replace")) == 0)
rule->string_escape = ESCAPE_REPLACE;
}
if (strstr(value, "all_partitions") != NULL) {
dbg(rules->udev, "creation of partition nodes requested\n");
rule->partitions = DEFAULT_PARTITIONS_COUNT;
}
valid = 1;
continue;
}
err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
}
if (physdev && rule->wait_for.operation == KEY_OP_UNSET)
err(rules->udev, "PHYSDEV* values are deprecated and will be removed from a future kernel, \n"
"please fix it in %s:%u", filename, lineno);
/* skip line if not any valid key was found */
if (!valid)
goto invalid;
/* grow buffer and add rule */
rule_size = sizeof(struct udev_rule) + rule->bufsize;
padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
dbg(rules->udev, "add %zi padding bytes\n", padding);
rule_size += padding;
rule->bufsize += padding;
rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
if (!rules->buf) {
err(rules->udev, "realloc failed\n");
goto exit;
}
dbg(rules->udev, "adding rule to offset %zi\n", rules->bufsize);
memcpy(rules->buf + rules->bufsize, rule, rule_size);
rules->bufsize += rule_size;
exit:
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)
{
FILE *f;
char line[UTIL_LINE_SIZE];
size_t start;
struct udev_rule *rule;
struct udev_rules_iter iter;
start = rules->bufsize;
info(rules->udev, "reading '%s' as rules file\n", filename);
f = fopen(filename, "r");
if (f == NULL)
return -1;
while(fgets(line, sizeof(line), f) != NULL) {
int line_nr = 0;
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;
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_to_rules(rules, key, filename, line_nr);
}
fclose(f);
/* compute all goto targets within this file */
udev_rules_iter_init(&iter, rules);
udev_rules_iter_goto(&iter, start);
while((rule = udev_rules_iter_next(&iter))) {
if (rule->goto_label.operation != KEY_OP_UNSET) {
char *goto_label = &rule->buf[rule->goto_label.val_off];
dbg(rules->udev, "resolving goto label '%s'\n", goto_label);
rule->goto_rule_off = find_label(&iter, goto_label);
if (rule->goto_rule_off == 0) {
err(rules->udev, "ignore goto to nonexistent label '%s' in '%s'\n",
goto_label, filename);
rule->goto_rule_off = iter.current;
}
}
}
return 0;
}
static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
{
struct dirent *ent;
DIR *dir;
char filename[UTIL_PATH_SIZE];
dbg(udev, "open directory '%s'\n", dirname);
dir = opendir(dirname);
if (dir == NULL) {
err(udev, "unable to open '%s': %m\n", dirname);
return -1;
}
while (1) {
ent = readdir(dir);
if (ent == NULL || ent->d_name[0] == '\0')
break;
if ((ent->d_name[0] == '.') || (ent->d_name[0] == '#'))
continue;
/* look for file matching with specified suffix */
if (suffix != NULL) {
const char *ext;
ext = strrchr(ent->d_name, '.');
if (ext == NULL)
continue;
if (strcmp(ext, suffix) != 0)
continue;
}
dbg(udev, "put file '%s/%s' into list\n", dirname, ent->d_name);
snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
filename[sizeof(filename)-1] = '\0';
udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
}
closedir(dir);
return 0;
}
int udev_rules_init(struct udev *udev, struct udev_rules *rules, int resolve_names)
{
struct stat statbuf;
char filename[PATH_MAX];
struct udev_list_node file_list;
struct udev_list_entry *file_loop, *file_tmp;
int retval = 0;
memset(rules, 0x00, sizeof(struct udev_rules));
rules->udev = udev;
rules->resolve_names = resolve_names;
udev_list_init(&file_list);
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 {
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_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
if (stat(filename, &statbuf) != 0) {
create_path(udev, filename);
udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
mkdir(filename, 0755);
udev_selinux_resetfscreatecon(udev);
}
udev_list_init(&sort_list);
add_matching_files(udev, &sort_list, filename, ".rules");
/* read default rules */
add_matching_files(udev, &sort_list, UDEV_PREFIX "/lib/udev/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;
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_remove(sort_loop);
sort_loop = NULL;
break;
}
if (strcmp(file_base, sort_base) > 0)
break;
}
if (sort_loop != NULL)
udev_list_entry_move_before(sort_loop, file_loop);
}
}
/* parse list of files */
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);
if (stat(file_name, &statbuf) == 0 && statbuf.st_size > 0)
parse_file(rules, file_name);
else
info(udev, "can not read '%s'\n", file_name);
udev_list_entry_remove(file_loop);
}
return retval;
}
void udev_rules_cleanup(struct udev_rules *rules)
{
if (rules->buf) {
free(rules->buf);
rules->buf = NULL;
}
}

937
udev/udev-rules.c
View File

@ -33,9 +33,161 @@
#include <sys/stat.h>
#include "udev.h"
#include "udev-rules.h"
extern char **environ;
#define PAIRS_MAX 5
enum key_operation {
KEY_OP_UNSET,
KEY_OP_MATCH,
KEY_OP_NOMATCH,
KEY_OP_ADD,
KEY_OP_ASSIGN,
KEY_OP_ASSIGN_FINAL,
};
struct key {
enum key_operation operation;
size_t val_off;
};
struct key_pair {
struct key key;
size_t key_name_off;
};
struct key_pairs {
int count;
struct key_pair keys[PAIRS_MAX];
};
enum import_type {
IMPORT_UNSET,
IMPORT_PROGRAM,
IMPORT_FILE,
IMPORT_PARENT,
};
enum escape_type {
ESCAPE_UNSET,
ESCAPE_NONE,
ESCAPE_REPLACE,
};
struct udev_rule {
struct key action;
struct key devpath;
struct key kernel;
struct key subsystem;
struct key driver;
struct key_pairs attr;
struct key kernels;
struct key subsystems;
struct key drivers;
struct key_pairs attrs;
struct key_pairs env;
struct key program;
struct key result;
struct key import;
enum import_type import_type;
struct key test;
mode_t test_mode_mask;
struct key run;
struct key wait_for;
struct key label;
struct key goto_label;
size_t goto_rule_off;
struct key name;
struct key symlink;
struct key symlink_match;
struct key owner;
struct key group;
struct key mode;
enum escape_type string_escape;
unsigned int link_priority;
int event_timeout;
unsigned int partitions;
unsigned int last_rule:1,
run_ignore_error:1,
ignore_device:1,
ignore_remove:1;
size_t bufsize;
char buf[];
};
struct udev_rules_iter {
struct udev_rules *rules;
size_t current;
};
static void udev_rules_iter_init(struct udev_rules_iter *iter, struct udev_rules *rules)
{
dbg(rules->udev, "bufsize=%zi\n", rules->bufsize);
iter->rules = rules;
iter->current = 0;
}
static struct udev_rule *udev_rules_iter_next(struct udev_rules_iter *iter)
{
struct udev_rules *rules;
struct udev_rule *rule;
rules = iter->rules;
if (!rules)
return NULL;
dbg(rules->udev, "current=%zi\n", iter->current);
if (iter->current >= rules->bufsize) {
dbg(rules->udev, "no more rules\n");
return NULL;
}
/* get next rule */
rule = (struct udev_rule *) (rules->buf + iter->current);
iter->current += sizeof(struct udev_rule) + rule->bufsize;
return rule;
}
static struct udev_rule *udev_rules_iter_goto(struct udev_rules_iter *iter, size_t rule_off)
{
struct udev_rules *rules = iter->rules;
struct udev_rule *rule;
dbg(rules->udev, "current=%zi\n", iter->current);
iter->current = rule_off;
rule = (struct udev_rule *) (rules->buf + iter->current);
return rule;
}
static size_t find_label(const struct udev_rules_iter *iter, const char *label)
{
struct udev_rule *rule;
struct udev_rules *rules = iter->rules;
size_t current = iter->current;
next:
dbg(rules->udev, "current=%zi\n", current);
if (current >= rules->bufsize) {
dbg(rules->udev, "LABEL='%s' not found\n", label);
return 0;
}
rule = (struct udev_rule *) (rules->buf + current);
if (strcmp(&rule->buf[rule->label.val_off], label) != 0) {
dbg(rules->udev, "moving forward, looking for label '%s'\n", label);
current += sizeof(struct udev_rule) + rule->bufsize;
goto next;
}
dbg(rules->udev, "found label '%s'\n", label);
return current;
}
/* extract possible {attr} and move str behind it */
static char *get_format_attribute(struct udev *udev, char **str)
@ -1247,7 +1399,7 @@ try_parent:
if (match_key(event->udev, "RESULT", rule, &rule->result, event->program_result))
goto nomatch;
/* import variables returned from program or or file into environment */
/* import variables returned from program or or file into properties */
if (rule->import.operation != KEY_OP_UNSET) {
char import[UTIL_PATH_SIZE];
int rc = -1;
@ -1618,3 +1770,782 @@ int udev_rules_get_run(struct udev_rules *rules, struct udev_event *event)
return 0;
}
static int get_key(struct udev_rules *rules, char **line, char **key, enum key_operation *operation, 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] == '=') {
*operation = KEY_OP_MATCH;
linepos += 2;
dbg(rules->udev, "match:\n");
} else if (linepos[0] == '!' && linepos[1] == '=') {
*operation = KEY_OP_NOMATCH;
linepos += 2;
dbg(rules->udev, "nomatch:\n");
} else if (linepos[0] == '+' && linepos[1] == '=') {
*operation = KEY_OP_ADD;
linepos += 2;
dbg(rules->udev, "add:\n");
} else if (linepos[0] == '=') {
*operation = KEY_OP_ASSIGN;
linepos++;
dbg(rules->udev, "assign:\n");
} else if (linepos[0] == ':' && linepos[1] == '=') {
*operation = KEY_OP_ASSIGN_FINAL;
linepos += 2;
dbg(rules->udev, "assign_final:\n");
} 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;
temp = strchr(linepos, '"');
if (!temp)
return -1;
temp[0] = '\0';
temp++;
dbg(rules->udev, "'%s'-'%s'\n", *key, *value);
/* move line to next key */
*line = temp;
return 0;
}
/* extract possible KEY{attr} */
static char *get_key_attribute(struct udev_rules *rules, char *str)
{
char *pos;
char *attr;
attr = strchr(str, '{');
if (attr != NULL) {
attr++;
pos = strchr(attr, '}');
if (pos == NULL) {
err(rules->udev, "missing closing brace for format\n");
return NULL;
}
pos[0] = '\0';
dbg(rules->udev, "attribute='%s'\n", attr);
return attr;
}
return NULL;
}
static int add_rule_key(struct udev_rule *rule, struct key *key,
enum key_operation operation, const char *value)
{
size_t val_len = strnlen(value, UTIL_PATH_SIZE);
key->operation = operation;
key->val_off = rule->bufsize;
util_strlcpy(rule->buf + rule->bufsize, value, val_len+1);
rule->bufsize += val_len+1;
return 0;
}
static int add_rule_key_pair(struct udev_rules *rules, struct udev_rule *rule, struct key_pairs *pairs,
enum key_operation operation, const char *key, const char *value)
{
size_t key_len = strnlen(key, UTIL_PATH_SIZE);
if (pairs->count >= PAIRS_MAX) {
err(rules->udev, "skip, too many keys of the same type in a single rule\n");
return -1;
}
add_rule_key(rule, &pairs->keys[pairs->count].key, operation, value);
/* add the key-name of the pair */
pairs->keys[pairs->count].key_name_off = rule->bufsize;
util_strlcpy(rule->buf + rule->bufsize, key, key_len+1);
rule->bufsize += key_len+1;
pairs->count++;
return 0;
}
static int add_to_rules(struct udev_rules *rules, char *line, const char *filename, unsigned int lineno)
{
char buf[sizeof(struct udev_rule) + UTIL_LINE_SIZE];
struct udev_rule *rule;
size_t rule_size;
int valid;
char *linepos;
char *attr;
size_t padding;
int physdev = 0;
int retval;
memset(buf, 0x00, sizeof(buf));
rule = (struct udev_rule *) buf;
rule->event_timeout = -1;
linepos = line;
valid = 0;
/* get all the keys */
while (1) {
char *key;
char *value;
enum key_operation operation = KEY_OP_UNSET;
retval = get_key(rules, &linepos, &key, &operation, &value);
if (retval)
break;
if (strcasecmp(key, "ACTION") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid ACTION operation\n");
goto invalid;
}
add_rule_key(rule, &rule->action, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "DEVPATH") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid DEVPATH operation\n");
goto invalid;
}
add_rule_key(rule, &rule->devpath, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "KERNEL") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid KERNEL operation\n");
goto invalid;
}
add_rule_key(rule, &rule->kernel, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "SUBSYSTEM") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
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);
add_rule_key(rule, &rule->subsystem, operation, "subsystem|class|bus");
} else
add_rule_key(rule, &rule->subsystem, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "DRIVER") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid DRIVER operation\n");
goto invalid;
}
add_rule_key(rule, &rule->driver, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "ATTR{", sizeof("ATTR{")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("ATTR")-1);
if (attr == NULL) {
err(rules->udev, "error parsing ATTR attribute\n");
goto invalid;
}
if (add_rule_key_pair(rules, rule, &rule->attr, operation, attr, value) != 0)
goto invalid;
valid = 1;
continue;
}
if (strcasecmp(key, "KERNELS") == 0 ||
strcasecmp(key, "ID") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid KERNELS operation\n");
goto invalid;
}
add_rule_key(rule, &rule->kernels, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "SUBSYSTEMS") == 0 ||
strcasecmp(key, "BUS") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid SUBSYSTEMS operation\n");
goto invalid;
}
add_rule_key(rule, &rule->subsystems, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "DRIVERS") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid DRIVERS operation\n");
goto invalid;
}
add_rule_key(rule, &rule->drivers, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "ATTRS{", sizeof("ATTRS{")-1) == 0 ||
strncasecmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid ATTRS operation\n");
goto invalid;
}
attr = get_key_attribute(rules, 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);
if (add_rule_key_pair(rules, rule, &rule->attrs, operation, attr, value) != 0)
goto invalid;
valid = 1;
continue;
}
if (strncasecmp(key, "ENV{", sizeof("ENV{")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("ENV")-1);
if (attr == NULL) {
err(rules->udev, "error parsing ENV attribute\n");
goto invalid;
}
if (strncmp(attr, "PHYSDEV", 7) == 0)
physdev = 1;
if (add_rule_key_pair(rules, rule, &rule->env, operation, attr, value) != 0)
goto invalid;
valid = 1;
continue;
}
if (strcasecmp(key, "PROGRAM") == 0) {
add_rule_key(rule, &rule->program, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "RESULT") == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid RESULT operation\n");
goto invalid;
}
add_rule_key(rule, &rule->result, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "IMPORT", sizeof("IMPORT")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("IMPORT")-1);
if (attr != NULL && strstr(attr, "program")) {
dbg(rules->udev, "IMPORT will be executed\n");
rule->import_type = IMPORT_PROGRAM;
} else if (attr != NULL && strstr(attr, "file")) {
dbg(rules->udev, "IMPORT will be included as file\n");
rule->import_type = IMPORT_FILE;
} else if (attr != NULL && strstr(attr, "parent")) {
dbg(rules->udev, "IMPORT will include the parent values\n");
rule->import_type = IMPORT_PARENT;
} else {
/* figure it out if it is executable */
char file[UTIL_PATH_SIZE];
char *pos;
struct stat statbuf;
util_strlcpy(file, value, sizeof(file));
pos = strchr(file, ' ');
if (pos)
pos[0] = '\0';
/* allow programs in /lib/udev called without the path */
if (strchr(file, '/') == NULL) {
util_strlcpy(file, UDEV_PREFIX "/lib/udev/", sizeof(file));
util_strlcat(file, value, sizeof(file));
pos = strchr(file, ' ');
if (pos)
pos[0] = '\0';
}
dbg(rules->udev, "IMPORT auto mode for '%s'\n", file);
if (!lstat(file, &statbuf) && (statbuf.st_mode & S_IXUSR)) {
dbg(rules->udev, "IMPORT is executable, will be executed (autotype)\n");
rule->import_type = IMPORT_PROGRAM;
} else {
dbg(rules->udev, "IMPORT is not executable, will be included as file (autotype)\n");
rule->import_type = IMPORT_FILE;
}
}
add_rule_key(rule, &rule->import, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "TEST", sizeof("TEST")-1) == 0) {
if (operation != KEY_OP_MATCH &&
operation != KEY_OP_NOMATCH) {
err(rules->udev, "invalid TEST operation\n");
goto invalid;
}
attr = get_key_attribute(rules, key + sizeof("TEST")-1);
if (attr != NULL)
rule->test_mode_mask = strtol(attr, NULL, 8);
add_rule_key(rule, &rule->test, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "RUN", sizeof("RUN")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("RUN")-1);
if (attr != NULL) {
if (strstr(attr, "ignore_error"))
rule->run_ignore_error = 1;
}
add_rule_key(rule, &rule->run, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "WAIT_FOR") == 0 || strcasecmp(key, "WAIT_FOR_SYSFS") == 0) {
add_rule_key(rule, &rule->wait_for, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "LABEL") == 0) {
add_rule_key(rule, &rule->label, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "GOTO") == 0) {
add_rule_key(rule, &rule->goto_label, operation, value);
valid = 1;
continue;
}
if (strncasecmp(key, "NAME", sizeof("NAME")-1) == 0) {
attr = get_key_attribute(rules, key + sizeof("NAME")-1);
if (attr != NULL) {
if (strstr(attr, "all_partitions") != NULL) {
dbg(rules->udev, "creation of partition nodes requested\n");
rule->partitions = DEFAULT_FAKE_PARTITIONS_COUNT;
}
if (strstr(attr, "ignore_remove") != NULL) {
dbg(rules->udev, "remove event should be ignored\n");
rule->ignore_remove = 1;
}
}
if (value[0] == '\0')
dbg(rules->udev, "name empty, node creation supressed\n");
add_rule_key(rule, &rule->name, operation, value);
continue;
}
if (strcasecmp(key, "SYMLINK") == 0) {
if (operation == KEY_OP_MATCH ||
operation == KEY_OP_NOMATCH)
add_rule_key(rule, &rule->symlink_match, operation, value);
else
add_rule_key(rule, &rule->symlink, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "OWNER") == 0) {
valid = 1;
if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
char *endptr;
strtoul(value, &endptr, 10);
if (endptr[0] != '\0') {
char owner[32];
uid_t uid = lookup_user(rules->udev, value);
dbg(rules->udev, "replacing username='%s' by id=%i\n", value, uid);
sprintf(owner, "%u", (unsigned int) uid);
add_rule_key(rule, &rule->owner, operation, owner);
continue;
}
}
add_rule_key(rule, &rule->owner, operation, value);
continue;
}
if (strcasecmp(key, "GROUP") == 0) {
valid = 1;
if (rules->resolve_names && (!strchr(value, '$') && !strchr(value, '%'))) {
char *endptr;
strtoul(value, &endptr, 10);
if (endptr[0] != '\0') {
char group[32];
gid_t gid = lookup_group(rules->udev, value);
dbg(rules->udev, "replacing groupname='%s' by id=%i\n", value, gid);
sprintf(group, "%u", (unsigned int) gid);
add_rule_key(rule, &rule->group, operation, group);
continue;
}
}
add_rule_key(rule, &rule->group, operation, value);
continue;
}
if (strcasecmp(key, "MODE") == 0) {
add_rule_key(rule, &rule->mode, operation, value);
valid = 1;
continue;
}
if (strcasecmp(key, "OPTIONS") == 0) {
const char *pos;
if (strstr(value, "last_rule") != NULL) {
dbg(rules->udev, "last rule to be applied\n");
rule->last_rule = 1;
}
if (strstr(value, "ignore_device") != NULL) {
dbg(rules->udev, "device should be ignored\n");
rule->ignore_device = 1;
}
if (strstr(value, "ignore_remove") != NULL) {
dbg(rules->udev, "remove event should be ignored\n");
rule->ignore_remove = 1;
}
pos = strstr(value, "link_priority=");
if (pos != NULL) {
rule->link_priority = atoi(&pos[strlen("link_priority=")]);
dbg(rules->udev, "link priority=%i\n", rule->link_priority);
}
pos = strstr(value, "event_timeout=");
if (pos != NULL) {
rule->event_timeout = atoi(&pos[strlen("event_timeout=")]);
dbg(rules->udev, "event timout=%i\n", rule->event_timeout);
}
pos = strstr(value, "string_escape=");
if (pos != NULL) {
pos = &pos[strlen("string_escape=")];
if (strncmp(pos, "none", strlen("none")) == 0)
rule->string_escape = ESCAPE_NONE;
else if (strncmp(pos, "replace", strlen("replace")) == 0)
rule->string_escape = ESCAPE_REPLACE;
}
if (strstr(value, "all_partitions") != NULL) {
dbg(rules->udev, "creation of partition nodes requested\n");
rule->partitions = DEFAULT_FAKE_PARTITIONS_COUNT;
}
valid = 1;
continue;
}
err(rules->udev, "unknown key '%s' in %s:%u\n", key, filename, lineno);
}
if (physdev && rule->wait_for.operation == KEY_OP_UNSET)
err(rules->udev, "PHYSDEV* values are deprecated and will be removed from a future kernel, \n"
"please fix it in %s:%u", filename, lineno);
/* skip line if not any valid key was found */
if (!valid)
goto invalid;
/* grow buffer and add rule */
rule_size = sizeof(struct udev_rule) + rule->bufsize;
padding = (sizeof(size_t) - rule_size % sizeof(size_t)) % sizeof(size_t);
dbg(rules->udev, "add %zi padding bytes\n", padding);
rule_size += padding;
rule->bufsize += padding;
rules->buf = realloc(rules->buf, rules->bufsize + rule_size);
if (!rules->buf) {
err(rules->udev, "realloc failed\n");
goto exit;
}
dbg(rules->udev, "adding rule to offset %zi\n", rules->bufsize);
memcpy(rules->buf + rules->bufsize, rule, rule_size);
rules->bufsize += rule_size;
exit:
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)
{
FILE *f;
char line[UTIL_LINE_SIZE];
size_t start;
struct udev_rule *rule;
struct udev_rules_iter iter;
start = rules->bufsize;
info(rules->udev, "reading '%s' as rules file\n", filename);
f = fopen(filename, "r");
if (f == NULL)
return -1;
while(fgets(line, sizeof(line), f) != NULL) {
int line_nr = 0;
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;
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_to_rules(rules, key, filename, line_nr);
}
fclose(f);
/* compute all goto targets within this file */
udev_rules_iter_init(&iter, rules);
udev_rules_iter_goto(&iter, start);
while((rule = udev_rules_iter_next(&iter))) {
if (rule->goto_label.operation != KEY_OP_UNSET) {
char *goto_label = &rule->buf[rule->goto_label.val_off];
dbg(rules->udev, "resolving goto label '%s'\n", goto_label);
rule->goto_rule_off = find_label(&iter, goto_label);
if (rule->goto_rule_off == 0) {
err(rules->udev, "ignore goto to nonexistent label '%s' in '%s'\n",
goto_label, filename);
rule->goto_rule_off = iter.current;
}
}
}
return 0;
}
static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
{
struct dirent *ent;
DIR *dir;
char filename[UTIL_PATH_SIZE];
dbg(udev, "open directory '%s'\n", dirname);
dir = opendir(dirname);
if (dir == NULL) {
err(udev, "unable to open '%s': %m\n", dirname);
return -1;
}
while (1) {
ent = readdir(dir);
if (ent == NULL || ent->d_name[0] == '\0')
break;
if ((ent->d_name[0] == '.') || (ent->d_name[0] == '#'))
continue;
/* look for file matching with specified suffix */
if (suffix != NULL) {
const char *ext;
ext = strrchr(ent->d_name, '.');
if (ext == NULL)
continue;
if (strcmp(ext, suffix) != 0)
continue;
}
dbg(udev, "put file '%s/%s' into list\n", dirname, ent->d_name);
snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
filename[sizeof(filename)-1] = '\0';
udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
}
closedir(dir);
return 0;
}
int udev_rules_init(struct udev *udev, struct udev_rules *rules, int resolve_names)
{
struct stat statbuf;
char filename[PATH_MAX];
struct udev_list_node file_list;
struct udev_list_entry *file_loop, *file_tmp;
int retval = 0;
memset(rules, 0x00, sizeof(struct udev_rules));
rules->udev = udev;
rules->resolve_names = resolve_names;
udev_list_init(&file_list);
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 {
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_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
if (stat(filename, &statbuf) != 0) {
create_path(udev, filename);
udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
mkdir(filename, 0755);
udev_selinux_resetfscreatecon(udev);
}
udev_list_init(&sort_list);
add_matching_files(udev, &sort_list, filename, ".rules");
/* read default rules */
add_matching_files(udev, &sort_list, UDEV_PREFIX "/lib/udev/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;
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_remove(sort_loop);
sort_loop = NULL;
break;
}
if (strcmp(file_base, sort_base) > 0)
break;
}
if (sort_loop != NULL)
udev_list_entry_move_before(sort_loop, file_loop);
}
}
/* parse list of files */
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);
if (stat(file_name, &statbuf) == 0 && statbuf.st_size > 0)
parse_file(rules, file_name);
else
info(udev, "can not read '%s'\n", file_name);
udev_list_entry_remove(file_loop);
}
return retval;
}
void udev_rules_cleanup(struct udev_rules *rules)
{
if (rules->buf) {
free(rules->buf);
rules->buf = NULL;
}
}

134
udev/udev-rules.h
View File

@ -1,134 +0,0 @@
/*
* Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef UDEV_RULES_H
#define UDEV_RULES_H
#include "udev.h"
#define PAIRS_MAX 5
enum key_operation {
KEY_OP_UNSET,
KEY_OP_MATCH,
KEY_OP_NOMATCH,
KEY_OP_ADD,
KEY_OP_ASSIGN,
KEY_OP_ASSIGN_FINAL,
};
struct key {
enum key_operation operation;
size_t val_off;
};
struct key_pair {
struct key key;
size_t key_name_off;
};
struct key_pairs {
int count;
struct key_pair keys[PAIRS_MAX];
};
enum import_type {
IMPORT_UNSET,
IMPORT_PROGRAM,
IMPORT_FILE,
IMPORT_PARENT,
};
enum escape_type {
ESCAPE_UNSET,
ESCAPE_NONE,
ESCAPE_REPLACE,
};
struct udev_rule {
struct key action;
struct key devpath;
struct key kernel;
struct key subsystem;
struct key driver;
struct key_pairs attr;
struct key kernels;
struct key subsystems;
struct key drivers;
struct key_pairs attrs;
struct key_pairs env;
struct key program;
struct key result;
struct key import;
enum import_type import_type;
struct key test;
mode_t test_mode_mask;
struct key run;
struct key wait_for;
struct key label;
struct key goto_label;
size_t goto_rule_off;
struct key name;
struct key symlink;
struct key symlink_match;
struct key owner;
struct key group;
struct key mode;
enum escape_type string_escape;
unsigned int link_priority;
int event_timeout;
unsigned int partitions;
unsigned int last_rule:1,
run_ignore_error:1,
ignore_device:1,
ignore_remove:1;
size_t bufsize;
char buf[];
};
struct udev_rules {
struct udev *udev;
char *buf;
size_t bufsize;
int resolve_names;
};
struct udev_rules_iter {
struct udev_rules *rules;
size_t current;
};
extern int udev_rules_init(struct udev *udev, struct udev_rules *rules, int resolve_names);
extern void udev_rules_cleanup(struct udev_rules *rules);
extern void udev_rules_iter_init(struct udev_rules_iter *iter, struct udev_rules *rules);
extern struct udev_rule *udev_rules_iter_next(struct udev_rules_iter *iter);
extern struct udev_rule *udev_rules_iter_goto(struct udev_rules_iter *iter, size_t rule_off);
extern int udev_rules_get_name(struct udev_rules *rules, struct udev_event *event);
extern int udev_rules_get_run(struct udev_rules *rules, struct udev_event *event);
extern int udev_rules_run(struct udev_event *event);
extern void udev_rules_apply_format(struct udev_event *event, char *string, size_t maxsize);
#endif

21
udev/udev.h
View File

@ -30,7 +30,7 @@
#define ALLOWED_CHARS_FILE ALLOWED_CHARS "/"
#define ALLOWED_CHARS_INPUT ALLOWED_CHARS_FILE " $%?,"
#define DEFAULT_PARTITIONS_COUNT 15
#define DEFAULT_FAKE_PARTITIONS_COUNT 15
#define UDEV_EVENT_TIMEOUT 180
/* linux/include/linux/kobject.h */
@ -40,13 +40,9 @@
#define UDEV_CTRL_SOCK_PATH "@" UDEV_PREFIX "/org/kernel/udev/udevd"
#define UDEV_MAX(a,b) ((a) > (b) ? (a) : (b))
/* pipes */
#define READ_END 0
#define WRITE_END 1
struct udev_rules;
static inline void logging_init(const char *program_name)
{
openlog(program_name, LOG_PID | LOG_CONS, LOG_DAEMON);
@ -90,10 +86,25 @@ struct udev_event {
int exitstatus;
time_t queue_time;
};
struct udev_rules;
extern struct udev_event *udev_event_new(struct udev_device *dev);
extern void udev_event_unref(struct udev_event *event);
extern int udev_event_run(struct udev_event *event, struct udev_rules *rules);
/* udev-rules.c */
struct udev_rules {
struct udev *udev;
char *buf;
size_t bufsize;
int resolve_names;
};
extern int udev_rules_init(struct udev *udev, struct udev_rules *rules, int resolve_names);
extern void udev_rules_cleanup(struct udev_rules *rules);
extern int udev_rules_get_name(struct udev_rules *rules, struct udev_event *event);
extern int udev_rules_get_run(struct udev_rules *rules, struct udev_event *event);
extern int udev_rules_run(struct udev_event *event);
extern void udev_rules_apply_format(struct udev_event *event, char *string, size_t maxsize);
/* udev-node.c */
extern int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mode_t mode, uid_t uid, gid_t gid);
extern int udev_node_add(struct udev_device *dev, mode_t mode, const char *owner, const char *group, int test);

1
udev/udevadm-test.c
View File

@ -29,7 +29,6 @@
#include <getopt.h>
#include "udev.h"
#include "udev-rules.h"
int udevadm_test(struct udev *udev, int argc, char *argv[])
{

1
udev/udevd.c
View File

@ -36,7 +36,6 @@
#endif
#include "udev.h"
#include "udev-rules.h"
#define UDEVD_PRIORITY -4
#define UDEV_PRIORITY -2