*
* Copyright (C) 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/>.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
*/
#include <stdio.h>
int refcount;
int sock;
struct sockaddr_nl snl;
+ struct sockaddr_nl snl_peer;
struct sockaddr_un sun;
socklen_t addrlen;
};
+enum udev_monitor_netlink_group {
+ UDEV_MONITOR_KERNEL = 1,
+ UDEV_MONITOR_UDEV = 2,
+};
+
/**
* udev_monitor_new_from_socket:
* @udev: udev library context
* @socket_path: unix socket path
*
- * Create new udev monitor, setup and connect to a specified socket. The
- * path to a socket can point to an existing socket file, or it will be
- * created if needed. If neccessary, the permissions adjustment as well as
- * the later cleanup of the socket file, needs to be done by the caller.
- * If the socket path starts with a '@' character, an abstract namespace
+ * Create new udev monitor and connect to a specified socket. The
+ * path to a socket either points to an existing socket file, or if
+ * the socket path starts with a '@' character, an abstract namespace
* socket will be used.
*
+ * A socket file will not be created. If it does not already exist,
+ * it will fall-back and connect to an abstract namespace socket with
+ * the given path. The permissions adjustment of a socket file, as
+ * well as the later cleanup, needs to be done by the caller.
+ *
* The initial refcount is 1, and needs to be decremented to
- * release the ressources of the udev monitor.
+ * release the resources of the udev monitor.
*
* Returns: a new udev monitor, or #NULL, in case of an error
**/
struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char *socket_path)
{
struct udev_monitor *udev_monitor;
+ struct stat statbuf;
if (udev == NULL)
return NULL;
if (socket_path == NULL)
return NULL;
- udev_monitor = malloc(sizeof(struct udev_monitor));
+ udev_monitor = calloc(1, sizeof(struct udev_monitor));
if (udev_monitor == NULL)
return NULL;
- memset(udev_monitor, 0x00, sizeof(struct udev_monitor));
udev_monitor->refcount = 1;
udev_monitor->udev = udev;
udev_monitor->sun.sun_family = AF_LOCAL;
- strcpy(udev_monitor->sun.sun_path, socket_path);
- udev_monitor->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(udev_monitor->sun.sun_path);
-
- /* translate leading '@' to abstract namespace */
- if (udev_monitor->sun.sun_path[0] == '@')
+ if (socket_path[0] == '@') {
+ /* translate leading '@' to abstract namespace */
+ util_strlcpy(udev_monitor->sun.sun_path, socket_path, sizeof(udev_monitor->sun.sun_path));
udev_monitor->sun.sun_path[0] = '\0';
-
+ udev_monitor->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(socket_path);
+ } else if (stat(socket_path, &statbuf) == 0 && S_ISSOCK(statbuf.st_mode)) {
+ /* existing socket file */
+ util_strlcpy(udev_monitor->sun.sun_path, socket_path, sizeof(udev_monitor->sun.sun_path));
+ udev_monitor->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(socket_path);
+ } else {
+ /* no socket file, assume abstract namespace socket */
+ util_strlcpy(&udev_monitor->sun.sun_path[1], socket_path, sizeof(udev_monitor->sun.sun_path)-1);
+ udev_monitor->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(socket_path)+1;
+ }
udev_monitor->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (udev_monitor->sock == -1) {
err(udev, "error getting socket: %m\n");
free(udev_monitor);
return NULL;
}
- info(udev, "monitor %p created with '%s'\n", udev_monitor, socket_path);
+ util_set_fd_cloexec(udev_monitor->sock);
+
+ dbg(udev, "monitor %p created with '%s'\n", udev_monitor, socket_path);
return udev_monitor;
}
-struct udev_monitor *udev_monitor_new_from_netlink(struct udev *udev)
+/**
+ * udev_monitor_new_from_netlink:
+ * @udev: udev library context
+ * @name: name of event source
+ *
+ * Create new udev monitor and connect to a specified event
+ * source. Valid sources identifiers are "udev" and "kernel".
+ *
+ * Applications should usually not connect directly to the
+ * "kernel" events, because the devices might not be useable
+ * at that time, before udev has configured them, and created
+ * device nodes.
+ *
+ * Accessing devices at the same time as udev, might result
+ * in unpredictable behavior.
+ *
+ * The "udev" events are sent out after udev has finished its
+ * event processing, all rules have been processed, and needed
+ * device nodes are created.
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the resources of the udev monitor.
+ *
+ * Returns: a new udev monitor, or #NULL, in case of an error
+ **/
+struct udev_monitor *udev_monitor_new_from_netlink(struct udev *udev, const char *name)
{
struct udev_monitor *udev_monitor;
+ unsigned int group;
if (udev == NULL)
return NULL;
- udev_monitor = malloc(sizeof(struct udev_monitor));
+
+ if (name == NULL)
+ return NULL;
+ if (strcmp(name, "kernel") == 0)
+ group = UDEV_MONITOR_KERNEL;
+ else if (strcmp(name, "udev") == 0)
+ group = UDEV_MONITOR_UDEV;
+ else
+ return NULL;
+
+ udev_monitor = calloc(1, sizeof(struct udev_monitor));
if (udev_monitor == NULL)
return NULL;
- memset(udev_monitor, 0x00, sizeof(struct udev_monitor));
udev_monitor->refcount = 1;
udev_monitor->udev = udev;
free(udev_monitor);
return NULL;
}
+ util_set_fd_cloexec(udev_monitor->sock);
udev_monitor->snl.nl_family = AF_NETLINK;
- udev_monitor->snl.nl_pid = getpid();
- udev_monitor->snl.nl_groups = 1;
+ udev_monitor->snl.nl_groups = group;
+ udev_monitor->snl_peer.nl_family = AF_NETLINK;
+ udev_monitor->snl_peer.nl_groups = UDEV_MONITOR_UDEV;
- info(udev, "monitor %p created with NETLINK_KOBJECT_UEVENT\n", udev_monitor);
+ dbg(udev, "monitor %p created with NETLINK_KOBJECT_UEVENT (%u)\n", udev_monitor, group);
return udev_monitor;
}
int err;
const int on = 1;
- if (udev_monitor->snl.nl_family != 0) {
- err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->snl, sizeof(struct sockaddr_nl));
- if (err < 0) {
- err(udev_monitor->udev, "bind failed: %m\n");
- return err;
- }
- info(udev_monitor->udev, "monitor %p listening on netlink\n", udev_monitor);
- } else if (udev_monitor->sun.sun_family != 0) {
- err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->sun, udev_monitor->addrlen);
- if (err < 0) {
- err(udev_monitor->udev, "bind failed: %m\n");
- return err;
- }
- /* enable receiving of the sender credentials */
- setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
- info(udev_monitor->udev, "monitor %p listening on socket\n", udev_monitor);
+ if (udev_monitor->sun.sun_family != 0)
+ err = bind(udev_monitor->sock,
+ (struct sockaddr *)&udev_monitor->sun, udev_monitor->addrlen);
+ else if (udev_monitor->snl.nl_family != 0)
+ err = bind(udev_monitor->sock,
+ (struct sockaddr *)&udev_monitor->snl, sizeof(struct sockaddr_nl));
+ else
+ return -EINVAL;
+
+ if (err < 0) {
+ err(udev_monitor->udev, "bind failed: %m\n");
+ return err;
}
+
+ /* enable receiving of sender credentials */
+ setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
return 0;
}
+int udev_monitor_set_receive_buffer_size(struct udev_monitor *udev_monitor, int size)
+{
+ if (udev_monitor == NULL)
+ return -1;
+ return setsockopt(udev_monitor->sock, SOL_SOCKET, SO_RCVBUFFORCE, &size, sizeof(size));
+}
+
/**
* udev_monitor_ref:
* @udev_monitor: udev monitor
* udev_monitor_unref:
* @udev_monitor: udev monitor
*
- * Drop a reference ofa udev monitor. If the refcount reaches zero,
- * the bound socket will be closed, and the ressources of the monitor
+ * Drop a reference of a udev monitor. If the refcount reaches zero,
+ * the bound socket will be closed, and the resources of the monitor
* will be released.
*
**/
return;
if (udev_monitor->sock >= 0)
close(udev_monitor->sock);
- info(udev_monitor->udev, "monitor %p released\n", udev_monitor);
+ dbg(udev_monitor->udev, "monitor %p released\n", udev_monitor);
free(udev_monitor);
}
* device, fill in the received data, and return the device.
*
* Only socket connections with uid=0 are accepted. The caller
- * needs to make sure, that there is data to read from the socket,
- * the call will block until the socket becomes readable.
+ * needs to make sure that there is data to read from the socket.
+ * The call will block until the socket becomes readable.
*
* The initial refcount is 1, and needs to be decremented to
- * release the ressources of the udev device.
+ * release the resources of the udev device.
*
* Returns: a new udev device, or #NULL, in case of an error
**/
struct msghdr smsg;
struct iovec iov;
char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
+ struct cmsghdr *cmsg;
+ struct sockaddr_nl snl;
+ struct ucred *cred;
char buf[4096];
size_t bufpos;
+ int devpath_set = 0;
+ int subsystem_set = 0;
+ int action_set = 0;
int maj = 0;
int min = 0;
smsg.msg_control = cred_msg;
smsg.msg_controllen = sizeof(cred_msg);
+ if (udev_monitor->snl.nl_family != 0) {
+ smsg.msg_name = &snl;
+ smsg.msg_namelen = sizeof snl;
+ }
+
if (recvmsg(udev_monitor->sock, &smsg, 0) < 0) {
if (errno != EINTR)
- info(udev_monitor->udev, "unable to receive message");
+ info(udev_monitor->udev, "unable to receive message\n");
return NULL;
}
- if (udev_monitor->sun.sun_family != 0) {
- struct cmsghdr *cmsg = CMSG_FIRSTHDR(&smsg);
- struct ucred *cred = (struct ucred *)CMSG_DATA (cmsg);
-
- if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
- info(udev_monitor->udev, "no sender credentials received, message ignored");
+ if (udev_monitor->snl.nl_family != 0) {
+ if (snl.nl_groups == 0) {
+ info(udev_monitor->udev, "unicast netlink message ignored\n");
return NULL;
}
-
- if (cred->uid != 0) {
- info(udev_monitor->udev, "sender uid=%d, message ignored", cred->uid);
+ if ((snl.nl_groups == UDEV_MONITOR_KERNEL) && (snl.nl_pid > 0)) {
+ info(udev_monitor->udev, "multicast kernel netlink message from pid %d ignored\n", snl.nl_pid);
return NULL;
}
}
+ cmsg = CMSG_FIRSTHDR(&smsg);
+ if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
+ info(udev_monitor->udev, "no sender credentials received, message ignored\n");
+ return NULL;
+ }
+
+ cred = (struct ucred *)CMSG_DATA(cmsg);
+ if (cred->uid != 0) {
+ info(udev_monitor->udev, "sender uid=%d, message ignored\n", cred->uid);
+ return NULL;
+ }
+
/* skip header */
bufpos = strlen(buf) + 1;
if (bufpos < sizeof("a@/d") || bufpos >= sizeof(buf)) {
- info(udev_monitor->udev, "invalid message length");
+ info(udev_monitor->udev, "invalid message length\n");
return NULL;
}
/* check message header */
if (strstr(buf, "@/") == NULL) {
- info(udev_monitor->udev, "unrecognized message header");
+ info(udev_monitor->udev, "unrecognized message header\n");
return NULL;
}
util_strlcpy(path, udev_get_sys_path(udev_monitor->udev), sizeof(path));
util_strlcat(path, &key[8], sizeof(path));
udev_device_set_syspath(udev_device, path);
+ devpath_set = 1;
} else if (strncmp(key, "SUBSYSTEM=", 10) == 0) {
udev_device_set_subsystem(udev_device, &key[10]);
+ subsystem_set = 1;
+ } else if (strncmp(key, "DEVTYPE=", 8) == 0) {
+ udev_device_set_devtype(udev_device, &key[8]);
} else if (strncmp(key, "DEVNAME=", 8) == 0) {
udev_device_set_devnode(udev_device, &key[8]);
} else if (strncmp(key, "DEVLINKS=", 9) == 0) {
- char *slink = &key[9];
- char *next = strchr(slink, ' ');
+ char devlinks[UTIL_PATH_SIZE];
+ char *slink;
+ char *next;
+ util_strlcpy(devlinks, &key[9], sizeof(devlinks));
+ slink = devlinks;
+ next = strchr(slink, ' ');
while (next != NULL) {
next[0] = '\0';
udev_device_add_devlink(udev_device, slink);
udev_device_set_driver(udev_device, &key[7]);
} else if (strncmp(key, "ACTION=", 7) == 0) {
udev_device_set_action(udev_device, &key[7]);
+ action_set = 1;
} else if (strncmp(key, "MAJOR=", 6) == 0) {
maj = strtoull(&key[6], NULL, 10);
} else if (strncmp(key, "MINOR=", 6) == 0) {
udev_device_set_seqnum(udev_device, strtoull(&key[7], NULL, 10));
} else if (strncmp(key, "TIMEOUT=", 8) == 0) {
udev_device_set_timeout(udev_device, strtoull(&key[8], NULL, 10));
- }
- if (strncmp(key, "PHYSDEV", 7) == 0)
+ } else if (strncmp(key, "PHYSDEV", 7) == 0) {
+ /* skip deprecated values */
continue;
- udev_device_add_property_from_string(udev_device, key);
+ } else {
+ udev_device_add_property_from_string(udev_device, key);
+ }
}
- udev_device_set_devnum(udev_device, makedev(maj, min));
-
+ if (!devpath_set || !subsystem_set || !action_set) {
+ info(udev_monitor->udev, "missing values, skip\n");
+ udev_device_unref(udev_device);
+ return NULL;
+ }
+ if (maj > 0)
+ udev_device_set_devnum(udev_device, makedev(maj, min));
udev_device_set_info_loaded(udev_device);
return udev_device;
}
+
+int udev_monitor_send_device(struct udev_monitor *udev_monitor, struct udev_device *udev_device)
+{
+ const char *buf;
+ ssize_t len;
+ ssize_t count;
+
+ len = udev_device_get_properties_monitor_buf(udev_device, &buf);
+ if (len < 32)
+ return -1;
+ if (udev_monitor->sun.sun_family != 0)
+ count = sendto(udev_monitor->sock,
+ buf, len, 0,
+ (struct sockaddr *)&udev_monitor->sun,
+ udev_monitor->addrlen);
+ else if (udev_monitor->snl.nl_family != 0)
+ /* no destination besides the muticast group, we will always get ECONNREFUSED */
+ count = sendto(udev_monitor->sock,
+ buf, len, 0,
+ (struct sockaddr *)&udev_monitor->snl_peer,
+ sizeof(struct sockaddr_nl));
+ else
+ return -1;
+
+ info(udev_monitor->udev, "passed %zi bytes to monitor %p\n", count, udev_monitor);
+ return count;
+}
~ianmdlvl / elogind.git / blobdiff