/*
- * udev_utils.c - generic stuff used by udev
+ * udev_device.c - main udev data object
*
- * Copyright (C) 2004, 2005 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004-2006 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
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
-#include <dirent.h>
-#include <syslog.h>
-#include <sys/wait.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <sys/utsname.h>
-
-#include "udev_libc_wrapper.h"
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <linux/sockios.h>
+
#include "udev.h"
-#include "logging.h"
-#include "udev_utils.h"
-#include "list.h"
+#include "udev_rules.h"
-int udev_init_device(struct udevice *udev, const char* devpath, const char *subsystem, const char *action)
+struct udevice *udev_device_init(void)
{
- char *pos;
+ struct udevice *udev;
+ udev = malloc(sizeof(struct udevice));
+ if (udev == NULL)
+ return NULL;
memset(udev, 0x00, sizeof(struct udevice));
+
INIT_LIST_HEAD(&udev->symlink_list);
INIT_LIST_HEAD(&udev->run_list);
INIT_LIST_HEAD(&udev->env_list);
- if (subsystem)
- strlcpy(udev->subsystem, subsystem, sizeof(udev->subsystem));
-
- if (action)
- strlcpy(udev->action, action, sizeof(udev->action));
-
- if (devpath) {
- strlcpy(udev->devpath, devpath, sizeof(udev->devpath));
- remove_trailing_chars(udev->devpath, '/');
-
- if (strncmp(udev->devpath, "/block/", 7) == 0)
- udev->type = DEV_BLOCK;
- else if (strncmp(udev->devpath, "/class/net/", 11) == 0)
- udev->type = DEV_NET;
- else if (strncmp(udev->devpath, "/class/", 7) == 0)
- udev->type = DEV_CLASS;
- else if (strncmp(udev->devpath, "/devices/", 9) == 0)
- udev->type = DEV_DEVICE;
-
- /* get kernel name */
- pos = strrchr(udev->devpath, '/');
- if (pos) {
- strlcpy(udev->kernel_name, &pos[1], sizeof(udev->kernel_name));
- 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));
- dbg("kernel_number='%s'", udev->kernel_number);
- }
- }
+ /* set sysfs device to local storage, can be overridden if needed */
+ udev->dev = &udev->dev_local;
- if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS) {
- udev->mode = 0660;
- strcpy(udev->owner, "root");
- strcpy(udev->group, "root");
- }
+ /* default node permissions */
+ udev->mode = 0660;
+ strcpy(udev->owner, "root");
+ strcpy(udev->group, "root");
- return 0;
+ return udev;
}
-void udev_cleanup_device(struct udevice *udev)
+void udev_device_cleanup(struct udevice *udev)
{
name_list_cleanup(&udev->symlink_list);
name_list_cleanup(&udev->run_list);
name_list_cleanup(&udev->env_list);
+ free(udev);
+}
+
+dev_t udev_device_get_devt(struct udevice *udev)
+{
+ const char *attr;
+ unsigned int major, minor;
+
+ /* read it from sysfs */
+ attr = sysfs_attr_get_value(udev->dev->devpath, "dev");
+ if (attr != NULL) {
+ if (sscanf(attr, "%u:%u", &major, &minor) == 2)
+ return makedev(major, minor);
+ }
+ return makedev(0, 0);
+}
+
+static int rename_netif(struct udevice *udev)
+{
+ int sk;
+ struct ifreq ifr;
+ int retval;
+
+ info("changing net interface name from '%s' to '%s'", udev->dev->kernel_name, udev->name);
+ if (udev->test_run)
+ return 0;
+
+ sk = socket(PF_INET, SOCK_DGRAM, 0);
+ if (sk < 0) {
+ err("error opening socket: %s", strerror(errno));
+ return -1;
+ }
+
+ memset(&ifr, 0x00, sizeof(struct ifreq));
+ strlcpy(ifr.ifr_name, udev->dev->kernel_name, IFNAMSIZ);
+ strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
+ retval = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (retval != 0) {
+ int loop;
+
+ /* see if the destination interface name already exists */
+ if (errno != EEXIST) {
+ err("error changing netif name %s to %s: %s", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+ goto exit;
+ }
+
+ /* free our own name, another process may wait for us */
+ strlcpy(ifr.ifr_newname, udev->dev->kernel_name, IFNAMSIZ);
+ strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
+ retval = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (retval != 0) {
+ err("error changing netif name %s to %s: %s", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+ goto exit;
+ }
+
+ /* wait 30 seconds for our target to become available */
+ strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
+ strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
+ loop = 30 * 20;
+ while (loop--) {
+ retval = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (retval != 0) {
+ if (errno != EEXIST) {
+ err("error changing net interface name %s to %s: %s",
+ ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+ break;
+ }
+ dbg("wait for netif '%s' to become free, loop=%i", udev->name, (30 * 20) - loop);
+ usleep(1000 * 1000 / 20);
+ }
+ }
+ }
+
+exit:
+ close(sk);
+ return retval;
+}
+
+int udev_device_event(struct udev_rules *rules, struct udevice *udev)
+{
+ int retval = 0;
+
+ /* add device node */
+ if (major(udev->devt) != 0 &&
+ (strcmp(udev->action, "add") == 0 || strcmp(udev->action, "change") == 0)) {
+ struct udevice *udev_old;
+
+ dbg("device node add '%s'", udev->dev->devpath);
+
+ udev_rules_get_name(rules, udev);
+ if (udev->ignore_device) {
+ info("device event will be ignored");
+ goto exit;
+ }
+ if (udev->name[0] == '\0') {
+ info("device node creation supressed");
+ goto exit;
+ }
+
+ /* read current database entry, we may want to cleanup symlinks */
+ udev_old = udev_device_init();
+ if (udev_old != NULL) {
+ if (udev_db_get_device(udev_old, udev->dev->devpath) != 0) {
+ udev_device_cleanup(udev_old);
+ udev_old = NULL;
+ } else
+ info("device '%s' already in database, validate currently present symlinks",
+ udev->dev->devpath);
+ }
+
+ /* create node and symlinks */
+ retval = udev_node_add(udev, udev_old);
+ if (retval == 0) {
+ /* store record in database */
+ udev_db_add_device(udev);
+
+ /* remove possibly left-over symlinks */
+ if (udev_old != NULL) {
+ struct name_entry *link_loop;
+ struct name_entry *link_old_loop;
+ struct name_entry *link_old_tmp_loop;
+
+ /* remove still valid symlinks from old list */
+ list_for_each_entry_safe(link_old_loop, link_old_tmp_loop, &udev_old->symlink_list, node)
+ list_for_each_entry(link_loop, &udev->symlink_list, node)
+ if (strcmp(link_old_loop->name, link_loop->name) == 0) {
+ dbg("symlink '%s' still valid, keep it", link_old_loop->name);
+ list_del(&link_old_loop->node);
+ free(link_old_loop);
+ }
+ udev_node_remove_symlinks(udev_old);
+ udev_device_cleanup(udev_old);
+ }
+ }
+ goto exit;
+ }
+
+ /* add netif */
+ if (strcmp(udev->dev->subsystem, "net") == 0 && strcmp(udev->action, "add") == 0) {
+ dbg("netif add '%s'", udev->dev->devpath);
+ udev_rules_get_name(rules, udev);
+ if (udev->ignore_device) {
+ info("device event will be ignored");
+ goto exit;
+ }
+
+ /* look if we want to change the name of the netif */
+ if (strcmp(udev->name, udev->dev->kernel_name) != 0) {
+ char *pos;
+
+ retval = rename_netif(udev);
+ if (retval != 0)
+ goto exit;
+ info("renamed netif to '%s'", udev->name);
+
+ /* export old name */
+ setenv("INTERFACE_OLD", udev->dev->kernel_name, 1);
+
+ /* now fake the devpath, because the kernel name changed silently */
+ pos = strrchr(udev->dev->devpath, '/');
+ if (pos != NULL) {
+ pos[1] = '\0';
+ strlcat(udev->dev->devpath, udev->name, sizeof(udev->dev->devpath));
+ strlcpy(udev->dev->kernel_name, udev->name, sizeof(udev->dev->kernel_name));
+ setenv("DEVPATH", udev->dev->devpath, 1);
+ setenv("INTERFACE", udev->name, 1);
+ }
+ }
+ goto exit;
+ }
+
+ /* remove device node */
+ if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
+ struct name_entry *name_loop;
+
+ /* import and delete database entry */
+ if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
+ udev_db_delete_device(udev);
+ if (udev->ignore_remove) {
+ dbg("remove event for '%s' requested to be ignored by rule", udev->name);
+ return 0;
+ }
+ /* restore stored persistent data */
+ list_for_each_entry(name_loop, &udev->env_list, node)
+ putenv(name_loop->name);
+ } else {
+ dbg("'%s' not found in database, using kernel name '%s'", udev->dev->devpath, udev->dev->kernel_name);
+ strlcpy(udev->name, udev->dev->kernel_name, sizeof(udev->name));
+ }
+
+ udev_rules_get_run(rules, udev);
+ if (udev->ignore_device) {
+ info("device event will be ignored");
+ goto exit;
+ }
+
+ retval = udev_node_remove(udev);
+ goto exit;
+ }
+
+ /* default devices */
+ udev_rules_get_run(rules, udev);
+ if (udev->ignore_device)
+ info("device event will be ignored");
+
+exit:
+ return retval;
}
~ianmdlvl / elogind.git / blobdiff