rename udev source files

1 files changed, 286 insertions, 0 deletions

diff --git a/udev/udev-event.c b/udev/udev-event.c
new file mode 100644
index 0000000000..24f7c55bbc
--- /dev/null
+++ b/udev/udev-event.c
@@ -0,0 +1,286 @@
+/*
+ * 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/>.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <linux/sockios.h>
+
+#include "udev.h"
+#include "udev-rules.h"
+
+struct udev_event *udev_event_new(struct udev_device *dev)
+{
+	struct udev_event *event;
+
+	event = malloc(sizeof(struct udev_event));
+	if (event == NULL)
+		return NULL;
+	memset(event, 0x00, sizeof(struct udev_event));
+
+	event->dev = dev;
+	event->udev = udev_device_get_udev(dev);
+	udev_list_init(&event->run_list);
+	event->mode = 0660;
+	util_strlcpy(event->owner, "0", sizeof(event->owner));
+	util_strlcpy(event->group, "0", sizeof(event->group));
+
+	dbg(event->udev, "allocated event %p\n", event);
+	return event;
+}
+
+void udev_event_unref(struct udev_event *event)
+{
+	udev_list_cleanup(event->udev, &event->run_list);
+	dbg(event->udev, "free event %p\n", event);
+	free(event);
+}
+
+static void kernel_log(struct ifreq ifr)
+{
+	int klog;
+	FILE *f;
+
+	klog = open("/dev/kmsg", O_WRONLY);
+	if (klog < 0)
+		return;
+
+	f = fdopen(klog, "w");
+	if (f == NULL) {
+		close(klog);
+		return;
+	}
+
+	fprintf(f, "<6>udev: renamed network interface %s to %s\n",
+		ifr.ifr_name, ifr.ifr_newname);
+	fclose(f);
+}
+
+static int rename_netif(struct udev_event *event)
+{
+	struct udev_device *dev = event->dev;
+	int sk;
+	struct ifreq ifr;
+	int err;
+
+	info(event->udev, "changing net interface name from '%s' to '%s'\n",
+	     udev_device_get_sysname(dev), event->name);
+	if (event->test)
+		return 0;
+
+	sk = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sk < 0) {
+		err(event->udev, "error opening socket: %m\n");
+		return -1;
+	}
+
+	memset(&ifr, 0x00, sizeof(struct ifreq));
+	util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
+	util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
+	err = ioctl(sk, SIOCSIFNAME, &ifr);
+	if (err == 0)
+		kernel_log(ifr);
+	else {
+		int loop;
+
+		/* see if the destination interface name already exists */
+		if (errno != EEXIST) {
+			err(event->udev, "error changing netif name %s to %s: %m\n",
+			    ifr.ifr_name, ifr.ifr_newname);
+			goto exit;
+		}
+
+		/* free our own name, another process may wait for us */
+		util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
+		util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
+		err = ioctl(sk, SIOCSIFNAME, &ifr);
+		if (err != 0) {
+			err(event->udev, "error changing netif name %s to %s: %m\n",
+			    ifr.ifr_name, ifr.ifr_newname);
+			goto exit;
+		}
+
+		/* wait 30 seconds for our target to become available */
+		util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
+		util_strlcpy(ifr.ifr_newname, udev_device_get_devnode(dev), IFNAMSIZ);
+		loop = 30 * 20;
+		while (loop--) {
+			err = ioctl(sk, SIOCSIFNAME, &ifr);
+			if (err == 0) {
+				kernel_log(ifr);
+				break;
+			}
+
+			if (errno != EEXIST) {
+				err(event->udev, "error changing net interface name %s to %s: %m\n",
+				    ifr.ifr_name, ifr.ifr_newname);
+				break;
+			}
+			dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
+			    udev_device_get_devnode(dev), (30 * 20) - loop);
+			usleep(1000 * 1000 / 20);
+		}
+	}
+
+exit:
+	close(sk);
+	return err;
+}
+
+int udev_event_run(struct udev_event *event, struct udev_rules *rules)
+{
+	struct udev_device *dev = event->dev;
+	int err = 0;
+
+	if (udev_device_get_devpath_old(dev) != NULL) {
+		if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
+			info(event->udev, "moved database from '%s' to '%s'\n",
+			     udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
+	}
+
+	/* add device node */
+	if (major(udev_device_get_devnum(dev)) != 0 &&
+	    (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
+		char filename[UTIL_PATH_SIZE];
+		struct udev_device *dev_old;
+
+		dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
+
+		udev_rules_get_name(rules, event);
+		if (event->ignore_device) {
+			info(event->udev, "device event will be ignored\n");
+			goto exit;
+		}
+
+		if (event->name[0] == '\0') {
+			info(event->udev, "device node creation supressed\n");
+			goto exit;
+		}
+
+		/* set device node name */
+		util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
+		util_strlcat(filename, "/", sizeof(filename));
+		util_strlcat(filename, event->name, sizeof(filename));
+		udev_device_set_devnode(dev, filename);
+
+		/* read current database entry; cleanup, if it is known device */
+		dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
+		if (dev_old != NULL) {
+			info(event->udev, "device '%s' already in database, updating\n",
+			     udev_device_get_devpath(dev));
+			udev_node_update_old_links(dev, dev_old, event->test);
+			udev_device_unref(dev_old);
+		}
+
+		udev_device_update_db(dev);
+
+		err = udev_node_add(dev, event->mode, event->owner, event->group, event->test);
+		if (err != 0)
+			goto exit;
+
+		goto exit;
+	}
+
+	/* add netif */
+	if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
+		dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
+
+		udev_rules_get_name(rules, event);
+		if (event->ignore_device) {
+			info(event->udev, "device event will be ignored\n");
+			goto exit;
+		}
+		if (event->name[0] == '\0') {
+			info(event->udev, "device renaming supressed\n");
+			goto exit;
+		}
+
+		/* look if we want to change the name of the netif */
+		if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
+			char syspath[UTIL_PATH_SIZE];
+			char *pos;
+
+			err = rename_netif(event);
+			if (err != 0)
+				goto exit;
+			info(event->udev, "renamed netif to '%s'\n", event->name);
+
+			/* remember old name */
+			udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
+
+			/* now change the devpath, because the kernel device name has changed */
+			util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
+			pos = strrchr(syspath, '/');
+			if (pos != NULL) {
+				pos[1] = '\0';
+				util_strlcat(syspath, event->name, sizeof(syspath));
+				udev_device_set_syspath(event->dev, syspath);
+				udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
+				info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
+			}
+		}
+		goto exit;
+	}
+
+	/* remove device node */
+	if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
+		/* import database entry and delete it */
+		udev_device_read_db(dev);
+		if (!event->test)
+			udev_device_delete_db(dev);
+
+		if (udev_device_get_devnode(dev) == NULL) {
+			char devnode[UTIL_PATH_SIZE];
+
+			info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
+			     udev_device_get_syspath(dev), udev_device_get_sysname(dev));
+			util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
+			util_strlcat(devnode, "/", sizeof(devnode));
+			util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
+			udev_device_set_devnode(dev, devnode);
+		}
+
+		udev_rules_get_run(rules, event);
+		if (event->ignore_device) {
+			info(event->udev, "device event will be ignored\n");
+			goto exit;
+		}
+
+		if (udev_device_get_ignore_remove(dev)) {
+			info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
+			goto exit;
+		}
+
+		err = udev_node_remove(dev, event->test);
+		goto exit;
+	}
+
+	/* default devices */
+	udev_rules_get_run(rules, event);
+	if (event->ignore_device)
+		info(event->udev, "device event will be ignored\n");
+exit:
+	return err;
+}