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bb144ed14d
systemd-stable/udev/udev-rules.c
Kay Sievers bb144ed14d update IMPORT= file/stdout property parsing
2008-10-16 22:41:52 +02:00

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/*
* Copyright (C) 2003 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 <fcntl.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <syslog.h>
#include <dirent.h>
#include <fnmatch.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include "udev.h"
#include "udev-rules.h"
extern char **environ;
/* extract possible {attr} and move str behind it */
static char *get_format_attribute(struct udev *udev, char **str)
{
char *pos;
char *attr = NULL;
if (*str[0] == '{') {
pos = strchr(*str, '}');
if (pos == NULL) {
err(udev, "missing closing brace for format\n");
return NULL;
}
pos[0] = '\0';
attr = *str+1;
*str = pos+1;
dbg(udev, "attribute='%s', str='%s'\n", attr, *str);
}
return attr;
}
/* extract possible format length and move str behind it*/
static int get_format_len(struct udev *udev, char **str)
{
int num;
char *tail;
if (isdigit(*str[0])) {
num = (int) strtoul(*str, &tail, 10);
if (num > 0) {
*str = tail;
dbg(udev, "format length=%i\n", num);
return num;
} else {
err(udev, "format parsing error '%s'\n", *str);
}
}
return -1;
}
static int run_program(struct udev_device *dev, const char *command,
char *result, size_t ressize, size_t *reslen)
{
struct udev *udev = udev_device_get_udev(dev);
int status;
char **envp;
int outpipe[2] = {-1, -1};
int errpipe[2] = {-1, -1};
pid_t pid;
char arg[UTIL_PATH_SIZE];
char program[UTIL_PATH_SIZE];
char *argv[(sizeof(arg) / 2) + 1];
int devnull;
int i;
int err = 0;
/* build argv from command */
util_strlcpy(arg, command, sizeof(arg));
i = 0;
if (strchr(arg, ' ') != NULL) {
char *pos = arg;
while (pos != NULL && pos[0] != '\0') {
if (pos[0] == '\'') {
/* do not separate quotes */
pos++;
argv[i] = strsep(&pos, "\'");
while (pos != NULL && pos[0] == ' ')
pos++;
} else {
argv[i] = strsep(&pos, " ");
}
dbg(udev, "arg[%i] '%s'\n", i, argv[i]);
i++;
}
argv[i] = NULL;
} else {
argv[0] = arg;
argv[1] = NULL;
}
info(udev, "'%s'\n", command);
/* prepare pipes from child to parent */
if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
if (pipe(outpipe) != 0) {
err(udev, "pipe failed: %m\n");
return -1;
}
}
if (udev_get_log_priority(udev) >= LOG_INFO) {
if (pipe(errpipe) != 0) {
err(udev, "pipe failed: %m\n");
return -1;
}
}
/* allow programs in /lib/udev/ to be called without the path */
if (strchr(argv[0], '/') == NULL) {
util_strlcpy(program, UDEV_PREFIX "/lib/udev/", sizeof(program));
util_strlcat(program, argv[0], sizeof(program));
argv[0] = program;
}
envp = udev_device_get_properties_envp(dev);
pid = fork();
switch(pid) {
case 0:
/* child closes parent ends of pipes */
if (outpipe[READ_END] > 0)
close(outpipe[READ_END]);
if (errpipe[READ_END] > 0)
close(errpipe[READ_END]);
/* discard child output or connect to pipe */
devnull = open("/dev/null", O_RDWR);
if (devnull > 0) {
dup2(devnull, STDIN_FILENO);
if (outpipe[WRITE_END] < 0)
dup2(devnull, STDOUT_FILENO);
if (errpipe[WRITE_END] < 0)
dup2(devnull, STDERR_FILENO);
close(devnull);
} else
err(udev, "open /dev/null failed: %m\n");
if (outpipe[WRITE_END] > 0) {
dup2(outpipe[WRITE_END], STDOUT_FILENO);
close(outpipe[WRITE_END]);
}
if (errpipe[WRITE_END] > 0) {
dup2(errpipe[WRITE_END], STDERR_FILENO);
close(errpipe[WRITE_END]);
}
execve(argv[0], argv, envp);
if (errno == ENOENT || errno == ENOTDIR) {
/* may be on a filesytem which is not mounted right now */
info(udev, "program '%s' not found\n", argv[0]);
} else {
/* other problems */
err(udev, "exec of program '%s' failed\n", argv[0]);
}
_exit(1);
case -1:
err(udev, "fork of '%s' failed: %m\n", argv[0]);
return -1;
default:
/* read from child if requested */
if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
ssize_t count;
size_t respos = 0;
/* parent closes child ends of pipes */
if (outpipe[WRITE_END] > 0)
close(outpipe[WRITE_END]);
if (errpipe[WRITE_END] > 0)
close(errpipe[WRITE_END]);
/* read child output */
while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
int fdcount;
fd_set readfds;
FD_ZERO(&readfds);
if (outpipe[READ_END] > 0)
FD_SET(outpipe[READ_END], &readfds);
if (errpipe[READ_END] > 0)
FD_SET(errpipe[READ_END], &readfds);
fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
if (fdcount < 0) {
if (errno == EINTR)
continue;
err = -1;
break;
}
/* get stdout */
if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
char inbuf[1024];
char *pos;
char *line;
count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
if (count <= 0) {
close(outpipe[READ_END]);
outpipe[READ_END] = -1;
if (count < 0) {
err(udev, "stdin read failed: %m\n");
err = -1;
}
continue;
}
inbuf[count] = '\0';
/* store result for rule processing */
if (result) {
if (respos + count < ressize) {
memcpy(&result[respos], inbuf, count);
respos += count;
} else {
err(udev, "ressize %ld too short\n", (long)ressize);
err = -1;
}
}
pos = inbuf;
while ((line = strsep(&pos, "\n")))
if (pos || line[0] != '\0')
info(udev, "'%s' (stdout) '%s'\n", argv[0], line);
}
/* get stderr */
if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
char errbuf[1024];
char *pos;
char *line;
count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
if (count <= 0) {
close(errpipe[READ_END]);
errpipe[READ_END] = -1;
if (count < 0)
err(udev, "stderr read failed: %m\n");
continue;
}
errbuf[count] = '\0';
pos = errbuf;
while ((line = strsep(&pos, "\n")))
if (pos || line[0] != '\0')
info(udev, "'%s' (stderr) '%s'\n", argv[0], line);
}
}
if (outpipe[READ_END] > 0)
close(outpipe[READ_END]);
if (errpipe[READ_END] > 0)
close(errpipe[READ_END]);
/* return the childs stdout string */
if (result) {
result[respos] = '\0';
dbg(udev, "result='%s'\n", result);
if (reslen)
*reslen = respos;
}
}
waitpid(pid, &status, 0);
if (WIFEXITED(status)) {
info(udev, "'%s' returned with status %i\n", argv[0], WEXITSTATUS(status));
if (WEXITSTATUS(status) != 0)
err = -1;
} else {
err(udev, "'%s' abnormal exit\n", argv[0]);
err = -1;
}
}
return err;
}
static int import_property_from_string(struct udev_device *dev, char *line)
{
struct udev *udev = udev_device_get_udev(dev);
char *key;
char *val;
size_t len;
/* find key */
key = line;
while (isspace(key[0]))
key++;
/* comment or empty line */
if (key[0] == '#' || key[0] == '\0')
return -1;
/* split key/value */
val = strchr(key, '=');
if (val == NULL)
return -1;
val[0] = '\0';
val++;
/* find value */
while (isspace(val[0]))
val++;
/* terminate key */
len = strlen(key);
if (len == 0)
return -1;
while (isspace(key[len-1]))
len--;
key[len] = '\0';
/* terminate value */
len = strlen(val);
if (len == 0)
return -1;
while (isspace(val[len-1]))
len--;
val[len] = '\0';
if (len == 0)
return -1;
/* unquote */
if (val[0] == '"' || val[0] == '\'') {
if (val[len-1] != val[0]) {
info(udev, "inconsistent quoting: '%s', skip\n", line);
return -1;
}
val[len-1] = '\0';
val++;
}
info(udev, "adding '%s'='%s'\n", key, val);
/* handle device, renamed by external tool, returning new path */
if (strcmp(key, "DEVPATH") == 0) {
char syspath[UTIL_PATH_SIZE];
info(udev, "updating devpath from '%s' to '%s'\n",
udev_device_get_devpath(dev), val);
util_strlcpy(syspath, udev_get_sys_path(udev), sizeof(syspath));
util_strlcat(syspath, val, sizeof(syspath));
udev_device_set_syspath(dev, syspath);
} else {
struct udev_list_entry *entry;
entry = udev_device_add_property(dev, key, val);
/* store in db */
udev_list_entry_set_flag(entry, 1);
}
return 0;
}
static int import_file_into_env(struct udev_device *dev, const char *filename)
{
FILE *f;
char line[UTIL_LINE_SIZE];
f = fopen(filename, "r");
if (f == NULL)
return -1;
while (fgets(line, sizeof(line), f))
import_property_from_string(dev, line);
fclose(f);
return 0;
}
static int import_program_into_env(struct udev_device *dev, const char *program)
{
char result[2048];
size_t reslen;
char *line;
if (run_program(dev, program, result, sizeof(result), &reslen) != 0)
return -1;
line = result;
while (line != NULL) {
char *pos;
pos = strchr(line, '\n');
if (pos != NULL) {
pos[0] = '\0';
pos = &pos[1];
}
import_property_from_string(dev, line);
line = pos;
}
return 0;
}
static int import_parent_into_env(struct udev_device *dev, const char *filter)
{
struct udev *udev = udev_device_get_udev(dev);
struct udev_device *dev_parent;
struct udev_list_entry *list_entry;
dev_parent = udev_device_get_parent(dev);
if (dev_parent == NULL)
return -1;
dbg(udev, "found parent '%s', get the node name\n", udev_device_get_syspath(dev_parent));
udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev_parent)) {
const char *key = udev_list_entry_get_name(list_entry);
const char *val = udev_list_entry_get_value(list_entry);
if (fnmatch(filter, key, 0) == 0) {
struct udev_list_entry *entry;
dbg(udev, "import key '%s=%s'\n", key, val);
entry = udev_device_add_property(dev, key, val);
/* store in db */
udev_list_entry_set_flag(entry, 1);
}
}
return 0;
}
int udev_rules_run(struct udev_event *event)
{
struct udev_list_entry *list_entry;
int err = 0;
dbg(event->udev, "executing run list\n");
udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
const char *cmd = udev_list_entry_get_name(list_entry);
if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
struct udev_monitor *monitor;
monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
if (monitor == NULL)
continue;
udev_monitor_send_device(monitor, event->dev);
udev_monitor_unref(monitor);
} else {
char program[UTIL_PATH_SIZE];
util_strlcpy(program, cmd, sizeof(program));
udev_rules_apply_format(event, program, sizeof(program));
if (run_program(event->dev, program, NULL, 0, NULL) != 0) {
if (!udev_list_entry_get_flag(list_entry))
err = -1;
}
}
}
return err;
}
#define WAIT_LOOP_PER_SECOND 50
static int wait_for_file(struct udev_event *event, const char *file, int timeout)
{
char filepath[UTIL_PATH_SIZE];
char devicepath[UTIL_PATH_SIZE] = "";
struct stat stats;
int loop = timeout * WAIT_LOOP_PER_SECOND;
/* a relative path is a device attribute */
if (file[0] != '/') {
util_strlcpy(devicepath, udev_get_sys_path(event->udev), sizeof(devicepath));
util_strlcat(devicepath, udev_device_get_devpath(event->dev), sizeof(devicepath));
util_strlcpy(filepath, devicepath, sizeof(filepath));
util_strlcat(filepath, "/", sizeof(filepath));
util_strlcat(filepath, file, sizeof(filepath));
file = filepath;
}
dbg(event->udev, "will wait %i sec for '%s'\n", timeout, file);
while (--loop) {
/* lookup file */
if (stat(file, &stats) == 0) {
info(event->udev, "file '%s' appeared after %i loops\n", file, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
return 0;
}
/* make sure, the device did not disappear in the meantime */
if (devicepath[0] != '\0' && stat(devicepath, &stats) != 0) {
info(event->udev, "device disappeared while waiting for '%s'\n", file);
return -2;
}
info(event->udev, "wait for '%s' for %i mseconds\n", file, 1000 / WAIT_LOOP_PER_SECOND);
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
info(event->udev, "waiting for '%s' failed\n", file);
return -1;
}
/* handle "[$SUBSYSTEM/$KERNEL]<attribute>" lookup */
static int split_subsys_sysname(struct udev *udev, char *attrstr, char **subsys, char **sysname, char **attr)
{
char *pos;
if (attrstr[0] != '[')
return -1;
*subsys = &attrstr[1];
pos = strchr(*subsys, ']');
if (pos == NULL)
return -1;
pos[0] = '\0';
pos = &pos[1];
if (pos[0] == '/')
pos = &pos[1];
if (pos[0] != '\0')
*attr = pos;
else
*attr = NULL;
pos = strchr(*subsys, '/');
if (pos == NULL)
return -1;
pos[0] = '\0';
*sysname = &pos[1];
return 0;
}
static int attr_subst_subdir(char *attr, size_t len)
{
char *pos;
int found = 0;
pos = strstr(attr, "/*/");
if (pos != NULL) {
char str[UTIL_PATH_SIZE];
DIR *dir;
pos[1] = '\0';
util_strlcpy(str, &pos[2], sizeof(str));
dir = opendir(attr);
if (dir != NULL) {
struct dirent *dent;
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
struct stat stats;
if (dent->d_name[0] == '.')
continue;
util_strlcat(attr, dent->d_name, len);
util_strlcat(attr, str, len);
if (stat(attr, &stats) == 0) {
found = 1;
break;
}
pos[1] = '\0';
}
closedir(dir);
}
if (!found)
util_strlcat(attr, str, len);
}
return found;
}
void udev_rules_apply_format(struct udev_event *event, char *string, size_t maxsize)
{
struct udev_device *dev = event->dev;
char temp[UTIL_PATH_SIZE];
char temp2[UTIL_PATH_SIZE];
char *head, *tail, *cpos, *attr, *rest;
int len;
int i;
int count;
enum subst_type {
SUBST_UNKNOWN,
SUBST_DEVPATH,
SUBST_KERNEL,
SUBST_KERNEL_NUMBER,
SUBST_ID,
SUBST_DRIVER,
SUBST_MAJOR,
SUBST_MINOR,
SUBST_RESULT,
SUBST_ATTR,
SUBST_PARENT,
SUBST_TEMP_NODE,
SUBST_NAME,
SUBST_LINKS,
SUBST_ROOT,
SUBST_SYS,
SUBST_ENV,
};
static const struct subst_map {
char *name;
char fmt;
enum subst_type type;
} map[] = {
{ .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
{ .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
{ .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
{ .name = "id", .fmt = 'b', .type = SUBST_ID },
{ .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
{ .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
{ .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
{ .name = "result", .fmt = 'c', .type = SUBST_RESULT },
{ .name = "attr", .fmt = 's', .type = SUBST_ATTR },
{ .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
{ .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
{ .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
{ .name = "name", .fmt = 'D', .type = SUBST_NAME },
{ .name = "links", .fmt = 'L', .type = SUBST_LINKS },
{ .name = "root", .fmt = 'r', .type = SUBST_ROOT },
{ .name = "sys", .fmt = 'S', .type = SUBST_SYS },
{ .name = "env", .fmt = 'E', .type = SUBST_ENV },
{ NULL, '\0', 0 }
};
enum subst_type type;
const struct subst_map *subst;
head = string;
while (1) {
len = -1;
while (head[0] != '\0') {
if (head[0] == '$') {
/* substitute named variable */
if (head[1] == '\0')
break;
if (head[1] == '$') {
util_strlcpy(temp, head+2, sizeof(temp));
util_strlcpy(head+1, temp, maxsize);
head++;
continue;
}
head[0] = '\0';
for (subst = map; subst->name; subst++) {
if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
type = subst->type;
tail = head + strlen(subst->name)+1;
dbg(event->udev, "will substitute format name '%s'\n", subst->name);
goto found;
}
}
head[0] = '$';
err(event->udev, "unknown format variable '%s'\n", head);
} else if (head[0] == '%') {
/* substitute format char */
if (head[1] == '\0')
break;
if (head[1] == '%') {
util_strlcpy(temp, head+2, sizeof(temp));
util_strlcpy(head+1, temp, maxsize);
head++;
continue;
}
head[0] = '\0';
tail = head+1;
len = get_format_len(event->udev, &tail);
for (subst = map; subst->name; subst++) {
if (tail[0] == subst->fmt) {
type = subst->type;
tail++;
dbg(event->udev, "will substitute format char '%c'\n", subst->fmt);
goto found;
}
}
head[0] = '%';
err(event->udev, "unknown format char '%c'\n", tail[0]);
}
head++;
}
break;
found:
attr = get_format_attribute(event->udev, &tail);
util_strlcpy(temp, tail, sizeof(temp));
dbg(event->udev, "format=%i, string='%s', tail='%s'\n", type ,string, tail);
switch (type) {
case SUBST_DEVPATH:
util_strlcat(string, udev_device_get_devpath(dev), maxsize);
dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
break;
case SUBST_KERNEL:
util_strlcat(string, udev_device_get_sysname(dev), maxsize);
dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
break;
case SUBST_KERNEL_NUMBER:
if (udev_device_get_sysnum(dev) == NULL)
break;
util_strlcat(string, udev_device_get_sysnum(dev), maxsize);
dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
break;
case SUBST_ID:
if (event->dev_parent != NULL) {
util_strlcat(string, udev_device_get_sysname(event->dev_parent), maxsize);
dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
}
break;
case SUBST_DRIVER:
if (event->dev_parent != NULL) {
const char *driver = udev_device_get_driver(event->dev_parent);
if (driver == NULL)
break;
util_strlcat(string, driver, maxsize);
dbg(event->udev, "substitute driver '%s'\n", driver);
}
break;
case SUBST_MAJOR:
sprintf(temp2, "%d", major(udev_device_get_devnum(dev)));
util_strlcat(string, temp2, maxsize);
dbg(event->udev, "substitute major number '%s'\n", temp2);
break;
case SUBST_MINOR:
sprintf(temp2, "%d", minor(udev_device_get_devnum(dev)));
util_strlcat(string, temp2, maxsize);
dbg(event->udev, "substitute minor number '%s'\n", temp2);
break;
case SUBST_RESULT:
if (event->program_result[0] == '\0')
break;
/* get part part of the result string */
i = 0;
if (attr != NULL)
i = strtoul(attr, &rest, 10);
if (i > 0) {
dbg(event->udev, "request part #%d of result string\n", i);
cpos = event->program_result;
while (--i) {
while (cpos[0] != '\0' && !isspace(cpos[0]))
cpos++;
while (isspace(cpos[0]))
cpos++;
}
if (i > 0) {
err(event->udev, "requested part of result string not found\n");
break;
}
util_strlcpy(temp2, cpos, sizeof(temp2));
/* %{2+}c copies the whole string from the second part on */
if (rest[0] != '+') {
cpos = strchr(temp2, ' ');
if (cpos)
cpos[0] = '\0';
}
util_strlcat(string, temp2, maxsize);
dbg(event->udev, "substitute part of result string '%s'\n", temp2);
} else {
util_strlcat(string, event->program_result, maxsize);
dbg(event->udev, "substitute result string '%s'\n", event->program_result);
}
break;
case SUBST_ATTR:
if (attr == NULL)
err(event->udev, "missing file parameter for attr\n");
else {
char *subsys;
char *sysname;
char *attrib;
char value[UTIL_NAME_SIZE] = "";
size_t size;
if (split_subsys_sysname(event->udev, attr, &subsys, &sysname, &attrib) == 0) {
struct udev_device *d;
const char *val;
if (attrib == NULL)
break;
d = udev_device_new_from_subsystem_sysname(event->udev, subsys, sysname);
if (d == NULL)
break;
val = udev_device_get_attr_value(d, attrib);
if (val != NULL)
util_strlcpy(value, val, sizeof(value));
udev_device_unref(d);
}
/* try the current device, other matches may have selected */
if (value[0]=='\0' && event->dev_parent != NULL && event->dev_parent != event->dev) {
const char *val;
val = udev_device_get_attr_value(event->dev_parent, attr);
if (val != NULL)
util_strlcpy(value, val, sizeof(value));
}
/* look at all devices along the chain of parents */
if (value[0]=='\0') {
struct udev_device *dev_parent = dev;
const char *val;
do {
dbg(event->udev, "looking at '%s'\n", udev_device_get_syspath(dev_parent));
val = udev_device_get_attr_value(dev_parent, attr);
if (val != NULL) {
util_strlcpy(value, val, sizeof(value));
break;
}
dev_parent = udev_device_get_parent(dev_parent);
} while (dev_parent != NULL);
}
if (value[0]=='\0')
break;
/* strip trailing whitespace, and replace unwanted characters */
size = strlen(value);
while (size > 0 && isspace(value[--size]))
value[size] = '\0';
count = util_replace_chars(value, ALLOWED_CHARS_INPUT);
if (count > 0)
info(event->udev, "%i character(s) replaced\n" , count);
util_strlcat(string, value, maxsize);
dbg(event->udev, "substitute sysfs value '%s'\n", value);
}
break;
case SUBST_PARENT:
{
struct udev_device *dev_parent;
const char *devnode;
dev_parent = udev_device_get_parent(event->dev);
if (dev_parent == NULL)
break;
devnode = udev_device_get_devnode(dev_parent);
if (devnode != NULL) {
size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
util_strlcat(string, &devnode[devlen], maxsize);
dbg(event->udev, "found parent '%s', got node name '%s'\n",
udev_device_get_syspath(dev_parent), &devnode[devlen]);
}
}
break;
case SUBST_TEMP_NODE:
if (event->tmp_node[0] == '\0' && major(udev_device_get_devnum(dev)) > 0) {
dbg(event->udev, "create temporary device node for callout\n");
snprintf(event->tmp_node, sizeof(event->tmp_node), "%s/.tmp-%u-%u",
udev_get_dev_path(event->udev),
major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
udev_node_mknod(dev, event->tmp_node, makedev(0,0), 0600, 0, 0);
}
util_strlcat(string, event->tmp_node, maxsize);
dbg(event->udev, "substitute temporary device node name '%s'\n", event->tmp_node);
break;
case SUBST_NAME:
if (event->name != NULL) {
util_strlcat(string, event->name, maxsize);
dbg(event->udev, "substitute name '%s'\n", event->name);
} else {
util_strlcat(string, udev_device_get_sysname(dev), maxsize);
dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
}
break;
case SUBST_LINKS:
{
struct udev_list_entry *list_entry;
list_entry = udev_device_get_properties_list_entry(dev);
util_strlcpy(string, udev_list_entry_get_name(list_entry), maxsize);
udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
util_strlcat(string, " ", maxsize);
util_strlcat(string, udev_list_entry_get_name(list_entry), maxsize);
}
}
break;
case SUBST_ROOT:
util_strlcat(string, udev_get_dev_path(event->udev), maxsize);
dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
break;
case SUBST_SYS:
util_strlcat(string, udev_get_sys_path(event->udev), maxsize);
dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
break;
case SUBST_ENV:
if (attr == NULL) {
dbg(event->udev, "missing attribute\n");
break;
} else {
struct udev_list_entry *list_entry;
const char *value;
list_entry = udev_device_get_properties_list_entry(event->dev);
list_entry = udev_list_entry_get_by_name(list_entry, attr);
if (list_entry == NULL)
break;
value = udev_list_entry_get_value(list_entry);
dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
util_strlcat(string, value, maxsize);
break;
}
default:
err(event->udev, "unknown substitution type=%i\n", type);
break;
}
/* possibly truncate to format-char specified length */
if (len >= 0 && len < (int)strlen(head)) {
head[len] = '\0';
dbg(event->udev, "truncate to %i chars, subtitution string becomes '%s'\n", len, head);
}
util_strlcat(string, temp, maxsize);
}
}
static char *key_val(struct udev_rule *rule, struct key *key)
{
return rule->buf + key->val_off;
}
static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
{
return rule->buf + pair->key_name_off;
}
static int match_key(struct udev *udev, const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
{
char value[UTIL_PATH_SIZE];
char *key_value;
char *pos;
int match = 0;
if (key->operation != KEY_OP_MATCH &&
key->operation != KEY_OP_NOMATCH)
return 0;
if (val == NULL)
val = "";
/* look for a matching string, parts are separated by '|' */
util_strlcpy(value, rule->buf + key->val_off, sizeof(value));
key_value = value;
dbg(udev, "key %s value='%s'\n", key_name, key_value);
while (key_value != NULL) {
pos = strchr(key_value, '|');
if (pos != NULL) {
pos[0] = '\0';
pos = &pos[1];
}
dbg(udev, "match %s '%s' <-> '%s'\n", key_name, key_value, val);
match = (fnmatch(key_value, val, 0) == 0);
if (match)
break;
key_value = pos;
}
if (match && (key->operation == KEY_OP_MATCH)) {
dbg(udev, "%s is true (matching value)\n", key_name);
return 0;
}
if (!match && (key->operation == KEY_OP_NOMATCH)) {
dbg(udev, "%s is true (non-matching value)\n", key_name);
return 0;
}
return -1;
}
/* match a single rule against a given device and possibly its parent devices */
static int match_rule(struct udev_event *event, struct udev_rule *rule)
{
struct udev_device *dev = event->dev;
int i;
if (match_key(event->udev, "ACTION", rule, &rule->action, udev_device_get_action(dev)))
goto nomatch;
if (match_key(event->udev, "KERNEL", rule, &rule->kernel, udev_device_get_sysname(dev)))
goto nomatch;
if (match_key(event->udev, "SUBSYSTEM", rule, &rule->subsystem, udev_device_get_subsystem(dev)))
goto nomatch;
if (match_key(event->udev, "DEVPATH", rule, &rule->devpath, udev_device_get_devpath(dev)))
goto nomatch;
if (match_key(event->udev, "DRIVER", rule, &rule->driver, udev_device_get_driver(dev)))
goto nomatch;
/* match NAME against a value assigned by an earlier rule */
if (match_key(event->udev, "NAME", rule, &rule->name, event->name))
goto nomatch;
/* match against current list of symlinks */
if (rule->symlink_match.operation == KEY_OP_MATCH ||
rule->symlink_match.operation == KEY_OP_NOMATCH) {
size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
struct udev_list_entry *list_entry;
int match = 0;
udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev)) {
const char *devlink;
devlink = &udev_list_entry_get_name(list_entry)[devlen];
if (match_key(event->udev, "SYMLINK", rule, &rule->symlink_match, devlink) == 0) {
match = 1;
break;
}
}
if (!match)
goto nomatch;
}
for (i = 0; i < rule->env.count; i++) {
struct key_pair *pair = &rule->env.keys[i];
/* we only check for matches, assignments will be handled later */
if (pair->key.operation == KEY_OP_MATCH ||
pair->key.operation == KEY_OP_NOMATCH) {
struct udev_list_entry *list_entry;
const char *key_name = key_pair_name(rule, pair);
const char *value;
list_entry = udev_device_get_properties_list_entry(event->dev);
list_entry = udev_list_entry_get_by_name(list_entry, key_name);
value = udev_list_entry_get_value(list_entry);
if (value == NULL) {
dbg(event->udev, "ENV{%s} is not set, treat as empty\n", key_name);
value = "";
}
if (match_key(event->udev, "ENV", rule, &pair->key, value))
goto nomatch;
}
}
if (rule->test.operation == KEY_OP_MATCH ||
rule->test.operation == KEY_OP_NOMATCH) {
char filename[UTIL_PATH_SIZE];
char *subsys;
char *sysname;
char *attrib;
struct stat statbuf;
int match;
util_strlcpy(filename, key_val(rule, &rule->test), sizeof(filename));
udev_rules_apply_format(event, filename, sizeof(filename));
if (split_subsys_sysname(event->udev, filename, &subsys, &sysname, &attrib) == 0) {
struct udev_device *d;
d = udev_device_new_from_subsystem_sysname(event->udev, subsys, sysname);
if (d != NULL) {
util_strlcpy(filename, udev_device_get_syspath(d), sizeof(filename));
if (attrib != NULL) {
util_strlcat(filename, "/", sizeof(filename));
util_strlcat(filename, attrib, sizeof(filename));
}
udev_device_unref(d);
}
} else if (filename[0] != '/') {
char tmp[UTIL_PATH_SIZE];
util_strlcpy(tmp, udev_device_get_syspath(dev), sizeof(tmp));
util_strlcat(tmp, "/", sizeof(tmp));
util_strlcat(tmp, filename, sizeof(tmp));
util_strlcpy(filename, tmp, sizeof(filename));
}
attr_subst_subdir(filename, sizeof(filename));
match = (stat(filename, &statbuf) == 0);
info(event->udev, "'%s' %s", filename, match ? "exists\n" : "does not exist\n");
if (match && rule->test_mode_mask > 0) {
match = ((statbuf.st_mode & rule->test_mode_mask) > 0);
info(event->udev, "'%s' has mode=%#o and %s %#o\n", filename, statbuf.st_mode,
match ? "matches" : "does not match",
rule->test_mode_mask);
}
if (match && rule->test.operation == KEY_OP_NOMATCH)
goto nomatch;
if (!match && rule->test.operation == KEY_OP_MATCH)
goto nomatch;
dbg(event->udev, "TEST key is true\n");
}
if (rule->wait_for.operation != KEY_OP_UNSET) {
char filename[UTIL_PATH_SIZE];
int found;
util_strlcpy(filename, key_val(rule, &rule->wait_for), sizeof(filename));
udev_rules_apply_format(event, filename, sizeof(filename));
found = (wait_for_file(event, filename, 10) == 0);
if (!found && (rule->wait_for.operation != KEY_OP_NOMATCH))
goto nomatch;
}
/* check for matching sysfs attribute pairs */
for (i = 0; i < rule->attr.count; i++) {
struct key_pair *pair = &rule->attr.keys[i];
if (pair->key.operation == KEY_OP_MATCH ||
pair->key.operation == KEY_OP_NOMATCH) {
char attr[UTIL_PATH_SIZE];
const char *key_name = key_pair_name(rule, pair);
const char *key_value = key_val(rule, &pair->key);
char *subsys;
char *sysname;
char *attrib;
char value[UTIL_NAME_SIZE] = "";
size_t len;
util_strlcpy(attr, key_name, sizeof(attr));
if (split_subsys_sysname(event->udev, attr, &subsys, &sysname, &attrib) == 0) {
struct udev_device *d;
const char *val;
if (attrib == NULL)
goto nomatch;
d = udev_device_new_from_subsystem_sysname(event->udev, subsys, sysname);
if (d == NULL)
goto nomatch;
val = udev_device_get_attr_value(d, attrib);
if (val != NULL)
util_strlcpy(value, val, sizeof(value));
udev_device_unref(d);
}
if (value[0]=='\0') {
const char *val;
val = udev_device_get_attr_value(dev, key_name);
if (val != NULL)
util_strlcpy(value, val, sizeof(value));
}
if (value[0]=='\0')
goto nomatch;
/* strip trailing whitespace of value, if not asked to match for it */
len = strlen(key_value);
if (len > 0 && !isspace(key_value[len-1])) {
len = strlen(value);
while (len > 0 && isspace(value[--len]))
value[len] = '\0';
dbg(event->udev, "removed trailing whitespace from '%s'\n", value);
}
if (match_key(event->udev, "ATTR", rule, &pair->key, value))
goto nomatch;
}
}
/* walk up the chain of parent devices and find a match */
event->dev_parent = dev;
while (1) {
/* check for matching kernel device name */
if (match_key(event->udev, "KERNELS", rule,
&rule->kernels, udev_device_get_sysname(event->dev_parent)))
goto try_parent;
/* check for matching subsystem value */
if (match_key(event->udev, "SUBSYSTEMS", rule,
&rule->subsystems, udev_device_get_subsystem(event->dev_parent)))
goto try_parent;
/* check for matching driver */
if (match_key(event->udev, "DRIVERS", rule,
&rule->drivers, udev_device_get_driver(event->dev_parent)))
goto try_parent;
/* check for matching sysfs attribute pairs */
for (i = 0; i < rule->attrs.count; i++) {
struct key_pair *pair = &rule->attrs.keys[i];
if (pair->key.operation == KEY_OP_MATCH ||
pair->key.operation == KEY_OP_NOMATCH) {
const char *key_name = key_pair_name(rule, pair);
const char *key_value = key_val(rule, &pair->key);
const char *val;
char value[UTIL_NAME_SIZE];
size_t len;
val = udev_device_get_attr_value(event->dev_parent, key_name);
if (val == NULL)
val = udev_device_get_attr_value(dev, key_name);
if (val == NULL)
goto try_parent;
util_strlcpy(value, val, sizeof(value));
/* strip trailing whitespace of value, if not asked to match for it */
len = strlen(key_value);
if (len > 0 && !isspace(key_value[len-1])) {
len = strlen(value);
while (len > 0 && isspace(value[--len]))
value[len] = '\0';
dbg(event->udev, "removed trailing whitespace from '%s'\n", value);
}
if (match_key(event->udev, "ATTRS", rule, &pair->key, value))
goto try_parent;
}
}
/* found matching device */
break;
try_parent:
/* move to parent device */
dbg(event->udev, "try parent sysfs device\n");
event->dev_parent = udev_device_get_parent(event->dev_parent);
if (event->dev_parent == NULL)
goto nomatch;
dbg(event->udev, "looking at dev_parent->devpath='%s'\n",
udev_device_get_syspath(event->dev_parent));
}
/* execute external program */
if (rule->program.operation != KEY_OP_UNSET) {
char program[UTIL_PATH_SIZE];
char result[UTIL_PATH_SIZE];
util_strlcpy(program, key_val(rule, &rule->program), sizeof(program));
udev_rules_apply_format(event, program, sizeof(program));
if (run_program(event->dev, program, result, sizeof(result), NULL) != 0) {
dbg(event->udev, "PROGRAM is false\n");
event->program_result[0] = '\0';
if (rule->program.operation != KEY_OP_NOMATCH)
goto nomatch;
} else {
int count;
dbg(event->udev, "PROGRAM matches\n");
util_remove_trailing_chars(result, '\n');
if (rule->string_escape == ESCAPE_UNSET ||
rule->string_escape == ESCAPE_REPLACE) {
count = util_replace_chars(result, ALLOWED_CHARS_INPUT);
if (count > 0)
info(event->udev, "%i character(s) replaced\n" , count);
}
dbg(event->udev, "result is '%s'\n", result);
util_strlcpy(event->program_result, result, sizeof(event->program_result));
dbg(event->udev, "PROGRAM returned successful\n");
if (rule->program.operation == KEY_OP_NOMATCH)
goto nomatch;
}
dbg(event->udev, "PROGRAM key is true\n");
}
/* check for matching result of external program */
if (match_key(event->udev, "RESULT", rule, &rule->result, event->program_result))
goto nomatch;
/* import variables returned from program or or file into environment */
if (rule->import.operation != KEY_OP_UNSET) {
char import[UTIL_PATH_SIZE];
int rc = -1;
util_strlcpy(import, key_val(rule, &rule->import), sizeof(import));
udev_rules_apply_format(event, import, sizeof(import));
dbg(event->udev, "check for IMPORT import='%s'\n", import);
if (rule->import_type == IMPORT_PROGRAM) {
rc = import_program_into_env(event->dev, import);
} else if (rule->import_type == IMPORT_FILE) {
dbg(event->udev, "import file import='%s'\n", import);
rc = import_file_into_env(event->dev, import);
} else if (rule->import_type == IMPORT_PARENT) {
dbg(event->udev, "import parent import='%s'\n", import);
rc = import_parent_into_env(event->dev, import);
}
if (rc != 0) {
dbg(event->udev, "IMPORT failed\n");
if (rule->import.operation != KEY_OP_NOMATCH)
goto nomatch;
} else
dbg(event->udev, "IMPORT '%s' imported\n", key_val(rule, &rule->import));
dbg(event->udev, "IMPORT key is true\n");
}
/* rule matches, if we have ENV assignments export it */
for (i = 0; i < rule->env.count; i++) {
struct key_pair *pair = &rule->env.keys[i];
if (pair->key.operation == KEY_OP_ASSIGN) {
char temp_value[UTIL_NAME_SIZE];
const char *key_name = key_pair_name(rule, pair);
const char *value = key_val(rule, &pair->key);
/* make sure we don't write to the same string we possibly read from */
util_strlcpy(temp_value, value, sizeof(temp_value));
udev_rules_apply_format(event, temp_value, sizeof(temp_value));
if (temp_value[0] != '\0') {
struct udev_list_entry *entry;
info(event->udev, "set ENV '%s=%s'\n", key_name, temp_value);
entry = udev_device_add_property(dev, key_name, temp_value);
/* store in db */
udev_list_entry_set_flag(entry, 1);
}
}
}
/* if we have ATTR assignments, write value to sysfs file */
for (i = 0; i < rule->attr.count; i++) {
struct key_pair *pair = &rule->attr.keys[i];
if (pair->key.operation == KEY_OP_ASSIGN) {
const char *key_name = key_pair_name(rule, pair);
char *subsys;
char *sysname;
char *attrib;
char attr[UTIL_PATH_SIZE];
char value[UTIL_NAME_SIZE];
FILE *f;
util_strlcpy(attr, key_name, sizeof(attr));
if (split_subsys_sysname(event->udev, attr, &subsys, &sysname, &attrib) == 0) {
struct udev_device *d;
d = udev_device_new_from_subsystem_sysname(event->udev, subsys, sysname);
if (d != NULL) {
util_strlcpy(attr, udev_device_get_syspath(d), sizeof(attr));
if (attrib != NULL) {
util_strlcat(attr, "/", sizeof(attr));
util_strlcat(attr, attrib, sizeof(attr));
}
udev_device_unref(d);
}
} else {
util_strlcpy(attr, udev_device_get_syspath(dev), sizeof(attr));
util_strlcat(attr, "/", sizeof(attr));
util_strlcat(attr, key_name, sizeof(attr));
}
attr_subst_subdir(attr, sizeof(attr));
util_strlcpy(value, key_val(rule, &pair->key), sizeof(value));
udev_rules_apply_format(event, value, sizeof(value));
info(event->udev, "writing '%s' to sysfs file '%s'\n", value, attr);
f = fopen(attr, "w");
if (f != NULL) {
if (!event->test)
if (fprintf(f, "%s", value) <= 0)
err(event->udev, "error writing ATTR{%s}: %m\n", attr);
fclose(f);
} else
err(event->udev, "error opening ATTR{%s} for writing: %m\n", attr);
}
}
return 0;
nomatch:
return -1;
}
int udev_rules_get_name(struct udev_rules *rules, struct udev_event *event)
{
struct udev_device *dev = event->dev;
struct udev_rules_iter iter;
struct udev_rule *rule;
int name_set = 0;
dbg(event->udev, "device: '%s'\n", udev_device_get_syspath(dev));
/* look for a matching rule to apply */
udev_rules_iter_init(&iter, rules);
while (1) {
rule = udev_rules_iter_next(&iter);
if (rule == NULL)
break;
if (name_set &&
(rule->name.operation == KEY_OP_ASSIGN ||
rule->name.operation == KEY_OP_ASSIGN_FINAL ||
rule->name.operation == KEY_OP_ADD)) {
dbg(event->udev, "node name already set, rule ignored\n");
continue;
}
dbg(event->udev, "process rule\n");
if (match_rule(event, rule) == 0) {
/* apply options */
if (rule->ignore_device) {
info(event->udev, "rule applied, '%s' is ignored\n", udev_device_get_sysname(dev));
event->ignore_device = 1;
return 0;
}
if (rule->ignore_remove) {
udev_device_set_ignore_remove(dev, 1);
dbg(event->udev, "remove event should be ignored\n");
}
if (rule->link_priority != 0) {
udev_device_set_devlink_priority(dev, rule->link_priority);
info(event->udev, "devlink_priority=%i\n", rule->link_priority);
}
if (rule->event_timeout >= 0) {
udev_device_set_event_timeout(dev, rule->event_timeout);
info(event->udev, "event_timeout=%i\n", rule->event_timeout);
}
/* apply all_partitions option only at a disk device */
if (rule->partitions > 0 &&
strcmp(udev_device_get_subsystem(dev), "block") == 0 &&
udev_device_get_sysnum(dev) == NULL) {
udev_device_set_num_fake_partitions(dev, rule->partitions);
dbg(event->udev, "creation of partition nodes requested\n");
}
/* apply permissions */
if (!event->mode_final && rule->mode.operation != KEY_OP_UNSET) {
if (rule->mode.operation == KEY_OP_ASSIGN_FINAL)
event->mode_final = 1;
char buf[20];
util_strlcpy(buf, key_val(rule, &rule->mode), sizeof(buf));
udev_rules_apply_format(event, buf, sizeof(buf));
event->mode = strtol(buf, NULL, 8);
dbg(event->udev, "applied mode=%#o to '%s'\n",
event->mode, udev_device_get_sysname(dev));
}
if (!event->owner_final && rule->owner.operation != KEY_OP_UNSET) {
if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
event->owner_final = 1;
util_strlcpy(event->owner, key_val(rule, &rule->owner), sizeof(event->owner));
udev_rules_apply_format(event, event->owner, sizeof(event->owner));
dbg(event->udev, "applied owner='%s' to '%s'\n",
event->owner, udev_device_get_sysname(dev));
}
if (!event->group_final && rule->group.operation != KEY_OP_UNSET) {
if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
event->group_final = 1;
util_strlcpy(event->group, key_val(rule, &rule->group), sizeof(event->group));
udev_rules_apply_format(event, event->group, sizeof(event->group));
dbg(event->udev, "applied group='%s' to '%s'\n",
event->group, udev_device_get_sysname(dev));
}
/* collect symlinks */
if (!event->devlink_final &&
(rule->symlink.operation == KEY_OP_ASSIGN ||
rule->symlink.operation == KEY_OP_ASSIGN_FINAL ||
rule->symlink.operation == KEY_OP_ADD)) {
char temp[UTIL_PATH_SIZE];
char filename[UTIL_PATH_SIZE];
char *pos, *next;
int count = 0;
if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
event->devlink_final = 1;
if (rule->symlink.operation == KEY_OP_ASSIGN ||
rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
info(event->udev, "reset symlink list\n");
udev_device_cleanup_devlinks_list(dev);
}
/* allow multiple symlinks separated by spaces */
util_strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
udev_rules_apply_format(event, temp, sizeof(temp));
if (rule->string_escape == ESCAPE_UNSET)
count = util_replace_chars(temp, ALLOWED_CHARS_FILE " ");
else if (rule->string_escape == ESCAPE_REPLACE)
count = util_replace_chars(temp, ALLOWED_CHARS_FILE);
if (count > 0)
info(event->udev, "%i character(s) replaced\n" , count);
dbg(event->udev, "rule applied, added symlink(s) '%s'\n", temp);
pos = temp;
while (isspace(pos[0]))
pos++;
next = strchr(pos, ' ');
while (next) {
next[0] = '\0';
info(event->udev, "add symlink '%s'\n", pos);
util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
util_strlcat(filename, "/", sizeof(filename));
util_strlcat(filename, pos, sizeof(filename));
udev_device_add_devlink(dev, filename);
while (isspace(next[1]))
next++;
pos = &next[1];
next = strchr(pos, ' ');
}
if (pos[0] != '\0') {
info(event->udev, "add symlink '%s'\n", pos);
util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
util_strlcat(filename, "/", sizeof(filename));
util_strlcat(filename, pos, sizeof(filename));
udev_device_add_devlink(dev, filename);
}
}
/* set name, later rules with name set will be ignored */
if (rule->name.operation == KEY_OP_ASSIGN ||
rule->name.operation == KEY_OP_ASSIGN_FINAL ||
rule->name.operation == KEY_OP_ADD) {
int count;
name_set = 1;
util_strlcpy(event->name, key_val(rule, &rule->name), sizeof(event->name));
udev_rules_apply_format(event, event->name, sizeof(event->name));
if (rule->string_escape == ESCAPE_UNSET ||
rule->string_escape == ESCAPE_REPLACE) {
count = util_replace_chars(event->name, ALLOWED_CHARS_FILE);
if (count > 0)
info(event->udev, "%i character(s) replaced\n", count);
}
info(event->udev, "rule applied, '%s' becomes '%s'\n",
udev_device_get_sysname(dev), event->name);
if (strcmp(udev_device_get_subsystem(dev), "net") != 0)
dbg(event->udev, "'%s' owner='%s', group='%s', mode=%#o partitions=%i\n",
event->name, event->owner, event->group, event->mode,
udev_device_get_num_fake_partitions(dev));
}
if (!event->run_final && rule->run.operation != KEY_OP_UNSET) {
struct udev_list_entry *list_entry;
if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
event->run_final = 1;
if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
info(event->udev, "reset run list\n");
udev_list_cleanup(event->udev, &event->run_list);
}
dbg(event->udev, "add run '%s'\n", key_val(rule, &rule->run));
list_entry = udev_list_entry_add(event->udev, &event->run_list,
key_val(rule, &rule->run), NULL, 1, 0);
if (rule->run_ignore_error && list_entry != NULL)
udev_list_entry_set_flag(list_entry, 1);
}
if (rule->last_rule) {
dbg(event->udev, "last rule to be applied\n");
break;
}
if (rule->goto_label.operation != KEY_OP_UNSET) {
dbg(event->udev, "moving forward to label '%s'\n", key_val(rule, &rule->goto_label));
udev_rules_iter_goto(&iter, rule->goto_rule_off);
}
}
}
if (!name_set) {
info(event->udev, "no node name set, will use kernel name '%s'\n",
udev_device_get_sysname(dev));
util_strlcpy(event->name, udev_device_get_sysname(dev), sizeof(event->name));
}
if (event->tmp_node[0] != '\0') {
dbg(event->udev, "removing temporary device node\n");
unlink_secure(event->udev, event->tmp_node);
event->tmp_node[0] = '\0';
}
return 0;
}
int udev_rules_get_run(struct udev_rules *rules, struct udev_event *event)
{
struct udev_device *dev = event->dev;
struct udev_rules_iter iter;
struct udev_rule *rule;
dbg(event->udev, "sysname: '%s'\n", udev_device_get_sysname(dev));
/* look for a matching rule to apply */
udev_rules_iter_init(&iter, rules);
while (1) {
rule = udev_rules_iter_next(&iter);
if (rule == NULL)
break;
dbg(event->udev, "process rule\n");
if (rule->name.operation == KEY_OP_ASSIGN ||
rule->name.operation == KEY_OP_ASSIGN_FINAL ||
rule->name.operation == KEY_OP_ADD ||
rule->symlink.operation == KEY_OP_ASSIGN ||
rule->symlink.operation == KEY_OP_ASSIGN_FINAL ||
rule->symlink.operation == KEY_OP_ADD ||
rule->mode.operation != KEY_OP_UNSET ||
rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
dbg(event->udev, "skip rule that names a device\n");
continue;
}
if (match_rule(event, rule) == 0) {
if (rule->ignore_device) {
info(event->udev, "rule applied, '%s' is ignored\n", udev_device_get_sysname(dev));
event->ignore_device = 1;
return 0;
}
if (rule->ignore_remove) {
udev_device_set_ignore_remove(dev, 1);
dbg(event->udev, "remove event should be ignored\n");
}
if (!event->run_final && rule->run.operation != KEY_OP_UNSET) {
struct udev_list_entry *list_entry;
if (rule->run.operation == KEY_OP_ASSIGN ||
rule->run.operation == KEY_OP_ASSIGN_FINAL) {
info(event->udev, "reset run list\n");
udev_list_cleanup(event->udev, &event->run_list);
}
dbg(event->udev, "add run '%s'\n", key_val(rule, &rule->run));
list_entry = udev_list_entry_add(event->udev, &event->run_list,
key_val(rule, &rule->run), NULL, 1, 0);
if (rule->run_ignore_error && list_entry != NULL)
udev_list_entry_set_flag(list_entry, 1);
if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
break;
}
if (rule->last_rule) {
dbg(event->udev, "last rule to be applied\n");
break;
}
if (rule->goto_label.operation != KEY_OP_UNSET) {
dbg(event->udev, "moving forward to label '%s'\n", key_val(rule, &rule->goto_label));
udev_rules_iter_goto(&iter, rule->goto_rule_off);
}
}
}
return 0;
}
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