X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=libudev%2Flibudev-device.c;h=a141dadf0a984bc4570f680c70be0e2b5b897a5d;hp=66f806316f55d75143f4d7a2e2242f99bcad805b;hb=9ead662791b5e59a95b6c5a9351d661cb61d76bb;hpb=48a0170b111b55e961be769d2cc4890511bcd991

diff --git a/libudev/libudev-device.c b/libudev/libudev-device.c
index 66f806316..a141dadf0 100644
--- a/libudev/libudev-device.c
+++ b/libudev/libudev-device.c
@@ -19,7 +19,11 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <ctype.h>
+#include <net/if.h>
 #include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/sockios.h>
 
 #include "libudev.h"
 #include "libudev-private.h"
@@ -60,9 +64,11 @@ struct udev_device {
 	size_t monitor_buf_len;
 	struct udev_list_node devlinks_list;
 	struct udev_list_node properties_list;
+	struct udev_list_node sysattr_value_list;
 	struct udev_list_node sysattr_list;
 	struct udev_list_node tags_list;
 	unsigned long long int seqnum;
+	unsigned long long int usec_initialized;
 	int event_timeout;
 	int timeout;
 	int devlink_priority;
@@ -82,6 +88,8 @@ struct udev_device {
 	bool db_loaded;
 	bool uevent_loaded;
 	bool is_initialized;
+	bool sysattr_list_read;
+	bool db_persist;
 };
 
 struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
@@ -230,24 +238,30 @@ const char *udev_device_get_property_value(struct udev_device *udev_device, cons
 	return udev_list_entry_get_value(list_entry);
 }
 
-int udev_device_read_db(struct udev_device *udev_device)
+int udev_device_read_db(struct udev_device *udev_device, const char *dbfile)
 {
-	const char *id;
 	char filename[UTIL_PATH_SIZE];
 	char line[UTIL_LINE_SIZE];
 	FILE *f;
 
-	if (udev_device->db_loaded)
-		return 0;
-	udev_device->db_loaded = true;
+	/* providing a database file will always force-load it */
+	if (dbfile == NULL) {
+		const char *id;
 
-	id = udev_device_get_id_filename(udev_device);
-	if (id == NULL)
-		return -1;
-	util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/.udev/db/", id, NULL);
-	f = fopen(filename, "re");
+		if (udev_device->db_loaded)
+			return 0;
+		udev_device->db_loaded = true;
+
+		id = udev_device_get_id_filename(udev_device);
+		if (id == NULL)
+			return -1;
+		util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev_device->udev), "/data/", id, NULL);
+		dbfile = filename;
+	}
+
+	f = fopen(dbfile, "re");
 	if (f == NULL) {
-		info(udev_device->udev, "no db file to read %s: %m\n", filename);
+		info(udev_device->udev, "no db file to read %s: %m\n", dbfile);
 		return -1;
 	}
 	udev_device->is_initialized = true;
@@ -284,6 +298,9 @@ int udev_device_read_db(struct udev_device *udev_device)
 		case 'W':
 			udev_device_set_watch_handle(udev_device, atoi(val));
 			break;
+		case 'I':
+			udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10));
+			break;
 		}
 	}
 	fclose(f);
@@ -356,6 +373,7 @@ struct udev_device *udev_device_new(struct udev *udev)
 	udev_device->udev = udev;
 	udev_list_init(&udev_device->devlinks_list);
 	udev_list_init(&udev_device->properties_list);
+	udev_list_init(&udev_device->sysattr_value_list);
 	udev_list_init(&udev_device->sysattr_list);
 	udev_list_init(&udev_device->tags_list);
 	udev_device->event_timeout = -1;
@@ -490,6 +508,35 @@ struct udev_device *udev_device_new_from_id_filename(struct udev *udev, char *id
 		if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3)
 			return NULL;
 		return udev_device_new_from_devnum(udev, type, makedev(maj, min));
+	case 'n': {
+		int sk;
+		struct ifreq ifr;
+		struct udev_device *dev;
+		int ifindex;
+
+		ifindex = strtoul(&id[1], NULL, 10);
+		if (ifindex <= 0)
+			return NULL;
+
+		sk = socket(PF_INET, SOCK_DGRAM, 0);
+		if (sk < 0)
+			return NULL;
+		memset(&ifr, 0x00, sizeof(struct ifreq));
+		ifr.ifr_ifindex = ifindex;
+		if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) {
+			close(sk);
+			return NULL;
+		}
+		close(sk);
+
+		dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name);
+		if (dev == NULL)
+			return NULL;
+		if (udev_device_get_ifindex(dev) == ifindex)
+			return dev;
+		udev_device_unref(dev);
+		return NULL;
+	}
 	case '+':
 		util_strscpy(subsys, sizeof(subsys), &id[1]);
 		sysname = strchr(subsys, ':');
@@ -780,6 +827,7 @@ void udev_device_unref(struct udev_device *udev_device)
 	free(udev_device->devtype);
 	udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
 	udev_list_cleanup_entries(udev_device->udev, &udev_device->properties_list);
+	udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_value_list);
 	udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list);
 	udev_list_cleanup_entries(udev_device->udev, &udev_device->tags_list);
 	free(udev_device->action);
@@ -867,7 +915,7 @@ const char *udev_device_get_devnode(struct udev_device *udev_device)
 		return NULL;
 	if (!udev_device->info_loaded) {
 		udev_device_read_uevent_file(udev_device);
-		udev_device_read_db(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	}
 
 	/* we might get called before we handled an event and have a db, use the kernel-provided name */
@@ -961,7 +1009,7 @@ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *
 	if (udev_device == NULL)
 		return NULL;
 	if (!udev_device->info_loaded)
-		udev_device_read_db(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	return udev_list_get_entry(&udev_device->devlinks_list);
 }
 
@@ -989,7 +1037,7 @@ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device
 		return NULL;
 	if (!udev_device->info_loaded) {
 		udev_device_read_uevent_file(udev_device);
-		udev_device_read_db(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	}
 	if (!udev_device->devlinks_uptodate) {
 		char symlinks[UTIL_PATH_SIZE];
@@ -1094,6 +1142,44 @@ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
 	return udev_device->seqnum;
 }
 
+/**
+ * udev_device_get_usec_since_initialized:
+ * @udev_device: udev device
+ *
+ * Return the number of microseconds passed since udev set up the
+ * device for the first time.
+ *
+ * This is only implemented for devices with need to store properties
+ * in the udev database. All other devices return 0 here.
+ *
+ * Returns: the number of microseconds since the device was first seen.
+ **/
+unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device)
+{
+	unsigned long long now;
+
+	if (udev_device == NULL)
+		return 0;
+	if (!udev_device->info_loaded)
+		udev_device_read_db(udev_device, NULL);
+	if (udev_device->usec_initialized == 0)
+		return 0;
+	now = usec_monotonic();
+	if (now == 0)
+		return 0;
+	return now - udev_device->usec_initialized;
+}
+
+unsigned long long udev_device_get_usec_initialized(struct udev_device *udev_device)
+{
+	return udev_device->usec_initialized;
+}
+
+void udev_device_set_usec_initialized(struct udev_device *udev_device, unsigned long long usec_initialized)
+{
+	udev_device->usec_initialized = usec_initialized;
+}
+
 /**
  * udev_device_get_sysattr_value:
  * @udev_device: udev device
@@ -1120,7 +1206,7 @@ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const
 		return NULL;
 
 	/* look for possibly already cached result */
-	udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_device->sysattr_list)) {
+	udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_device->sysattr_value_list)) {
 		if (strcmp(udev_list_entry_get_name(list_entry), sysattr) == 0) {
 			dbg(udev_device->udev, "got '%s' (%s) from cache\n",
 			    sysattr, udev_list_entry_get_value(list_entry));
@@ -1131,7 +1217,7 @@ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const
 	util_strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
 	if (lstat(path, &statbuf) != 0) {
 		dbg(udev_device->udev, "no attribute '%s', keep negative entry\n", path);
-		udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, NULL, 0, 0);
+		udev_list_entry_add(udev_device->udev, &udev_device->sysattr_value_list, sysattr, NULL, 0, 0);
 		goto out;
 	}
 
@@ -1155,7 +1241,7 @@ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const
 		if (pos != NULL) {
 			pos = &pos[1];
 			dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
-			list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, pos, 0, 0);
+			list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_value_list, sysattr, pos, 0, 0);
 			val = udev_list_entry_get_value(list_entry);
 		}
 
@@ -1187,12 +1273,78 @@ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const
 	value[size] = '\0';
 	util_remove_trailing_chars(value, '\n');
 	dbg(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
-	list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, value, 0, 0);
+	list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_value_list, sysattr, value, 0, 0);
 	val = udev_list_entry_get_value(list_entry);
 out:
 	return val;
 }
 
+static int udev_device_sysattr_list_read(struct udev_device *udev_device)
+{
+	struct dirent *dent;
+	DIR *dir;
+	int num = 0;
+
+	if (udev_device == NULL)
+		return -1;
+	if (udev_device->sysattr_list_read)
+		return 0;
+
+	dir = opendir(udev_device_get_syspath(udev_device));
+	if (!dir) {
+		dbg(udev_device->udev, "sysfs dir '%s' can not be opened\n",
+				udev_device_get_syspath(udev_device));
+		return -1;
+	}
+
+	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+		char path[UTIL_PATH_SIZE];
+		struct stat statbuf;
+
+		/* only handle symlinks and regular files */
+		if (dent->d_type != DT_LNK && dent->d_type != DT_REG)
+			continue;
+
+		util_strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL);
+		if (lstat(path, &statbuf) != 0)
+			continue;
+		if ((statbuf.st_mode & S_IRUSR) == 0)
+			continue;
+
+		udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list,
+				    dent->d_name, NULL, 0, 0);
+		num++;
+	}
+
+	closedir(dir);
+	dbg(udev_device->udev, "found %d sysattrs for '%s'\n", num, udev_device_get_syspath(udev_device));
+	udev_device->sysattr_list_read = true;
+
+	return num;
+}
+
+/**
+ * udev_device_get_sysattr_list_entry:
+ * @udev_device: udev device
+ *
+ * Retrieve the list of available sysattrs, with value being empty;
+ * This just return all available sysfs attributes for a particular
+ * device without reading their values.
+ *
+ * Returns: the first entry of the property list
+ **/
+struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
+{
+	if (!udev_device->sysattr_list_read) {
+		int ret;
+		ret = udev_device_sysattr_list_read(udev_device);
+		if (0 > ret)
+			return NULL;
+	}
+
+	return udev_list_get_entry(&udev_device->sysattr_list);
+}
+
 int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
 {
 	const char *pos;
@@ -1318,7 +1470,7 @@ const char *udev_device_get_id_filename(struct udev_device *udev_device)
  * device node permissions and context, or has renamed a network
  * device.
  *
- * For now, this is only implemented for devices with a device node
+ * This is only implemented for devices with a device node
  * or network interfaces. All other devices return 1 here.
  *
  * Returns: 1 if the device is set up. 0 otherwise.
@@ -1326,7 +1478,7 @@ const char *udev_device_get_id_filename(struct udev_device *udev_device)
 int udev_device_get_is_initialized(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
-		udev_device_read_db(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	return udev_device->is_initialized;
 }
 
@@ -1374,7 +1526,7 @@ int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
 	struct udev_list_entry *list_entry;
 
 	if (!udev_device->info_loaded)
-		udev_device_read_db(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	list_entry = udev_device_get_tags_list_entry(udev_device);
 	list_entry =  udev_list_entry_get_by_name(list_entry, tag);
 	if (list_entry != NULL)
@@ -1544,7 +1696,7 @@ int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
 int udev_device_get_event_timeout(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
-		udev_device_read_db(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	return udev_device->event_timeout;
 }
 
@@ -1584,7 +1736,7 @@ int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
 int udev_device_get_devlink_priority(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
-		udev_device_read_db(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	return udev_device->devlink_priority;
 }
 
@@ -1597,7 +1749,7 @@ int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
 int udev_device_get_watch_handle(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
-		udev_device_read_db(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	return udev_device->watch_handle;
 }
 
@@ -1623,3 +1775,13 @@ int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex)
 	udev_device_add_property(udev_device, "IFINDEX", num);
 	return 0;
 }
+
+bool udev_device_get_db_persist(struct udev_device *udev_device)
+{
+	return udev_device->db_persist;
+}
+
+void udev_device_set_db_persist(struct udev_device *udev_device)
+{
+	udev_device->db_persist = true;
+}