1
1
mirror of https://github.com/systemd/systemd-stable.git synced 2024-10-30 23:21:08 +03:00
systemd-stable/udev_utils.c

388 lines
8.3 KiB
C
Raw Normal View History

/*
* udev_lib - generic stuff used by udev
*
* Copyright (C) 2004 Kay Sievers <kay@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 version 2 of the License.
*
* 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, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/utsname.h>
#include "udev_libc_wrapper.h"
#include "udev.h"
#include "logging.h"
#include "udev_utils.h"
#include "list.h"
int udev_init_device(struct udevice *udev, const char* devpath, const char *subsystem, const char *action)
[PATCH] hmm, handle net devices with udev? Hmm, Arndt Bergmann sent a patch like this one a few weeks ago and I want to bring the question back, if we want to handle net device naming with udev. With this patch it is actually possible to specify something like this in udev.rules: KERNEL="dummy*", SYSFS{address}="00:00:00:00:00:00", SYSFS{features}="0x0", NAME="blind%n" KERNEL="eth*", SYSFS{address}="00:0d:60:77:30:91", NAME="private" and you will get: [root@pim udev.kay]# cat /proc/net/dev Inter-| Receive | Transmit face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed lo: 1500 30 0 0 0 0 0 0 1500 30 0 0 0 0 0 0 private: 278393 1114 0 0 0 0 0 0 153204 1468 0 0 0 0 0 0 sit0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 blind0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 The udevinfo program is also working: [root@pim udev.kay]# ./udevinfo -a -p /sys/class/net/private looking at class device '/sys/class/net/private': SYSFS{addr_len}="6" SYSFS{address}="00:0d:60:77:30:91" SYSFS{broadcast}="ff:ff:ff:ff:ff:ff" SYSFS{features}="0x3a9" SYSFS{flags}="0x1003" SYSFS{ifindex}="2" SYSFS{iflink}="2" SYSFS{mtu}="1500" SYSFS{tx_queue_len}="1000" SYSFS{type}="1" follow the class device's "device" looking at the device chain at '/sys/devices/pci0000:00/0000:00:1e.0/0000:02:01.0': BUS="pci" ID="0000:02:01.0" SYSFS{class}="0x020000" SYSFS{detach_state}="0" SYSFS{device}="0x101e" SYSFS{irq}="11" SYSFS{subsystem_device}="0x0549" SYSFS{subsystem_vendor}="0x1014" SYSFS{vendor}="0x8086" The matching device will be renamed to the given name. The device name will not be put into the udev database, cause the kernel renames the device and the sysfs name disappears. I like it, cause it plugs in nicely. We have all the naming features and sysfs queries and walks inside of udev. The sysfs timing races are already solved and the management tools are working for net devices too. nameif can only match the MAC address now. udev can match any sysfs value of the device tree the net device is connected to. But right, net devices do not have device nodes :)
2004-03-25 10:19:39 +03:00
{
char *pos;
memset(udev, 0x00, sizeof(struct udevice));
INIT_LIST_HEAD(&udev->symlink_list);
INIT_LIST_HEAD(&udev->run_list);
2004-11-20 09:42:19 +03:00
2005-03-04 23:13:18 +03:00
if (subsystem)
strlcpy(udev->subsystem, subsystem, sizeof(udev->subsystem));
2005-03-04 23:13:18 +03:00
if (action)
strlcpy(udev->action, action, sizeof(udev->action));
if (devpath) {
strlcpy(udev->devpath, devpath, sizeof(udev->devpath));
remove_trailing_char(udev->devpath, '/');
2004-04-01 11:00:45 +04:00
2005-03-04 23:13:18 +03:00
if (strncmp(udev->devpath, "/block/", 7) == 0)
2005-03-12 23:41:57 +03:00
udev->type = DEV_BLOCK;
2005-03-04 23:13:18 +03:00
else if (strncmp(udev->devpath, "/class/net/", 11) == 0)
2005-03-12 23:41:57 +03:00
udev->type = DEV_NET;
2005-03-04 23:13:18 +03:00
else if (strncmp(udev->devpath, "/class/", 7) == 0)
2005-03-12 23:41:57 +03:00
udev->type = DEV_CLASS;
2005-03-04 23:13:18 +03:00
else if (strncmp(udev->devpath, "/devices/", 9) == 0)
2005-03-12 23:41:57 +03:00
udev->type = DEV_DEVICE;
2005-03-04 23:13:18 +03:00
/* get kernel name */
pos = strrchr(udev->devpath, '/');
if (pos) {
strlcpy(udev->kernel_name, &pos[1], sizeof(udev->kernel_name));
2005-03-04 23:13:18 +03:00
dbg("kernel_name='%s'", udev->kernel_name);
/* Some block devices have '!' in their name, change that to '/' */
pos = udev->kernel_name;
while (pos[0] != '\0') {
if (pos[0] == '!')
pos[0] = '/';
pos++;
}
/* get kernel number */
pos = &udev->kernel_name[strlen(udev->kernel_name)];
while (isdigit(pos[-1]))
pos--;
strlcpy(udev->kernel_number, pos, sizeof(udev->kernel_number));
2005-03-04 23:13:18 +03:00
dbg("kernel_number='%s'", udev->kernel_number);
}
}
if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS) {
udev->mode = 0660;
strcpy(udev->owner, "root");
strcpy(udev->group, "root");
}
return 0;
}
void udev_cleanup_device(struct udevice *udev)
{
struct name_entry *name_loop;
struct name_entry *temp_loop;
list_for_each_entry_safe(name_loop, temp_loop, &udev->symlink_list, node) {
list_del(&name_loop->node);
free(name_loop);
}
}
int kernel_release_satisfactory(unsigned int version, unsigned int patchlevel, unsigned int sublevel)
{
static unsigned int kversion = 0;
static unsigned int kpatchlevel;
static unsigned int ksublevel;
if (kversion == 0) {
struct utsname uts;
if (uname(&uts) != 0)
return -1;
if (sscanf (uts.release, "%u.%u.%u", &kversion, &kpatchlevel, &ksublevel) != 3) {
kversion = 0;
return -1;
}
}
if (kversion >= version && kpatchlevel >= patchlevel && ksublevel >= sublevel)
return 1;
else
return 0;
}
int create_path(const char *path)
{
char p[PATH_SIZE];
char *pos;
struct stat stats;
strcpy (p, path);
pos = strrchr(p, '/');
if (pos == p || pos == NULL)
return 0;
while (pos[-1] == '/')
pos--;
pos[0] = '\0';
dbg("stat '%s'\n", p);
if (stat (p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
return 0;
if (create_path (p) != 0)
return -1;
dbg("mkdir '%s'\n", p);
return mkdir(p, 0755);
}
/* Reset permissions on the device node, before unlinking it to make sure,
* that permisions of possible hard links will be removed too.
*/
int unlink_secure(const char *filename)
{
int retval;
retval = chown(filename, 0, 0);
if (retval)
dbg("chown(%s, 0, 0) failed with error '%s'", filename, strerror(errno));
retval = chmod(filename, 0000);
if (retval)
dbg("chmod(%s, 0000) failed with error '%s'", filename, strerror(errno));
retval = unlink(filename);
if (errno == ENOENT)
retval = 0;
if (retval)
dbg("unlink(%s) failed with error '%s'", filename, strerror(errno));
return retval;
}
int file_map(const char *filename, char **buf, size_t *bufsize)
{
struct stat stats;
int fd;
fd = open(filename, O_RDONLY);
if (fd < 0) {
return -1;
}
if (fstat(fd, &stats) < 0) {
close(fd);
return -1;
}
*buf = mmap(NULL, stats.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (*buf == MAP_FAILED) {
close(fd);
return -1;
}
*bufsize = stats.st_size;
close(fd);
return 0;
}
void file_unmap(char *buf, size_t bufsize)
{
munmap(buf, bufsize);
}
/* return number of chars until the next newline, skip escaped newline */
size_t buf_get_line(const char *buf, size_t buflen, size_t cur)
{
int escape = 0;
size_t count;
for (count = cur; count < buflen; count++) {
if (!escape && buf[count] == '\n')
break;
if (buf[count] == '\\')
escape = 1;
else
escape = 0;
}
return count - cur;
}
void replace_untrusted_chars(char *string)
{
size_t len;
for (len = 0; string[len] != '\0'; len++) {
if (strchr(";,~\\()\'", string[len])) {
info("replace '%c' in '%s'", string[len], string);
string[len] = '_';
}
}
}
void remove_trailing_char(char *path, char c)
{
size_t len;
len = strlen(path);
while (len > 0 && path[len-1] == c)
path[--len] = '\0';
}
int name_list_add(struct list_head *name_list, const char *name, int sort)
{
struct name_entry *loop_name;
struct name_entry *new_name;
list_for_each_entry(loop_name, name_list, node) {
/* avoid doubles */
if (strcmp(loop_name->name, name) == 0) {
dbg("'%s' is already in the list", name);
return 0;
}
if (sort && strcmp(loop_name->name, name) > 0)
break;
}
new_name = malloc(sizeof(struct name_entry));
if (new_name == NULL) {
dbg("error malloc");
return -ENOMEM;
}
strlcpy(new_name->name, name, sizeof(new_name->name));
list_add_tail(&new_name->node, &loop_name->node);
return 0;
}
/* calls function for every file found in specified directory */
int add_matching_files(struct list_head *name_list, const char *dirname, const char *suffix)
{
struct dirent *ent;
DIR *dir;
char *ext;
char filename[PATH_SIZE];
dbg("open directory '%s'", dirname);
dir = opendir(dirname);
if (dir == NULL) {
dbg("unable to open '%s'", 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] == COMMENT_CHARACTER))
continue;
/* look for file matching with specified suffix */
ext = strrchr(ent->d_name, '.');
if (ext == NULL)
continue;
if (strcmp(ext, suffix) != 0)
continue;
dbg("put file '%s/%s' in list", dirname, ent->d_name);
snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
filename[sizeof(filename)-1] = '\0';
name_list_add(name_list, filename, 1);
}
closedir(dir);
return 0;
}
int execute_command(const char *command, const char *subsystem)
{
int retval;
pid_t pid;
char arg[PATH_SIZE];
char *argv[(PATH_SIZE / 2) + 1];
char *pos;
int devnull;
int i;
strlcpy(arg, command, sizeof(arg));
i = 0;
if (strchr(arg, ' ')) {
pos = arg;
while (pos != NULL) {
if (pos[0] == '\'') {
/* don't separate if in apostrophes */
pos++;
argv[i] = strsep(&pos, "\'");
while (pos && pos[0] == ' ')
pos++;
} else {
argv[i] = strsep(&pos, " ");
}
dbg("arg[%i] '%s'", i, argv[i]);
i++;
}
argv[i] = NULL;
dbg("execute '%s' with parsed arguments", arg);
} else {
argv[0] = arg;
argv[1] = (char *) subsystem;
argv[2] = NULL;
dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
}
pid = fork();
switch (pid) {
case 0:
/* child */
devnull = open("/dev/null", O_RDWR);
if (devnull >= 0) {
dup2(devnull, STDIN_FILENO);
dup2(devnull, STDOUT_FILENO);
dup2(devnull, STDERR_FILENO);
close(devnull);
}
retval = execv(arg, argv);
err("exec of child failed");
_exit(1);
case -1:
dbg("fork of child failed");
break;
return -1;
default:
waitpid(pid, NULL, 0);
}
return 0;
}