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libudev: monitor- add netlink uevent support

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This commit is contained in:
Kay Sievers 2008-09-09 17:38:10 +02:00
parent 3bc7c84cf0
commit 1c7047ea77
4 changed files with 70 additions and 25 deletions
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1
udev/lib/exported_symbols
View File

@ -23,6 +23,7 @@ udev_device_get_devnum
udev_device_get_seqnum
udev_devices_enumerate
udev_monitor_new_from_socket
udev_monitor_new_from_netlink
udev_monitor_enable_receiving
udev_monitor_ref
udev_monitor_unref

4
udev/lib/libudev-device.c
View File

@ -194,6 +194,10 @@ void udev_device_unref(struct udev_device *udev_device)
free(udev_device->subsystem);
name_list_cleanup(udev_device->udev, &udev_device->link_list);
name_list_cleanup(udev_device->udev, &udev_device->env_list);
free(udev_device->action);
free(udev_device->driver);
free(udev_device->devpath_old);
free(udev_device->physdevpath);
info(udev_device->udev, "udev_device: %p released\n", udev_device);
free(udev_device);
}

89
udev/lib/libudev-monitor.c
View File

@ -29,6 +29,7 @@
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <linux/netlink.h>
#include "libudev.h"
#include "libudev-private.h"
@ -38,7 +39,8 @@ struct udev_monitor {
struct udev *udev;
int refcount;
int sock;
struct sockaddr_un saddr;
struct sockaddr_nl snl;
struct sockaddr_un sun;
socklen_t addrlen;
};
@ -74,13 +76,13 @@ struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char
udev_monitor->refcount = 1;
udev_monitor->udev = udev;
udev_monitor->saddr.sun_family = AF_LOCAL;
strcpy(udev_monitor->saddr.sun_path, socket_path);
udev_monitor->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(udev_monitor->saddr.sun_path);
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->saddr.sun_path[0] == '@')
udev_monitor->saddr.sun_path[0] = '\0';
if (udev_monitor->sun.sun_path[0] == '@')
udev_monitor->sun.sun_path[0] = '\0';
udev_monitor->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (udev_monitor->sock == -1) {
@ -92,20 +94,56 @@ struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char
return udev_monitor;
}
struct udev_monitor *udev_monitor_new_from_netlink(struct udev *udev)
{
struct udev_monitor *udev_monitor;
if (udev == NULL)
return NULL;
udev_monitor = malloc(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->sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (udev_monitor->sock == -1) {
err(udev, "error getting socket: %s\n", strerror(errno));
free(udev_monitor);
return NULL;
}
udev_monitor->snl.nl_family = AF_NETLINK;
udev_monitor->snl.nl_pid = getpid();
udev_monitor->snl.nl_groups = 1;
info(udev, "monitor %p created with NETLINK_KOBJECT_UEVENT\n", udev_monitor);
return udev_monitor;
}
int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
{
int err;
const int on = 1;
err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->saddr, udev_monitor->addrlen);
if (err < 0) {
err(udev_monitor->udev, "bind failed: %s\n", strerror(errno));
return err;
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: %s\n", strerror(errno));
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: %s\n", strerror(errno));
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);
}
/* enable receiving of the sender credentials */
setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
info(udev_monitor->udev, "monitor %p listening\n", udev_monitor);
return 0;
}
@ -197,9 +235,7 @@ struct udev_device *udev_monitor_receive_device(struct udev_monitor *udev_monito
{
struct udev_device *udev_device;
struct msghdr smsg;
struct cmsghdr *cmsg;
struct iovec iov;
struct ucred *cred;
char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
char buf[4096];
size_t bufpos;
@ -222,17 +258,20 @@ struct udev_device *udev_monitor_receive_device(struct udev_monitor *udev_monito
info(udev_monitor->udev, "unable to receive message");
return NULL;
}
cmsg = CMSG_FIRSTHDR(&smsg);
cred = (struct ucred *)CMSG_DATA (cmsg);
if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
info(udev_monitor->udev, "no sender credentials received, message ignored");
return NULL;
}
if (udev_monitor->sun.sun_family != 0) {
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&smsg);
struct ucred *cred = (struct ucred *)CMSG_DATA (cmsg);
if (cred->uid != 0) {
info(udev_monitor->udev, "sender uid=%d, message ignored", cred->uid);
return NULL;
if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
info(udev_monitor->udev, "no sender credentials received, message ignored");
return NULL;
}
if (cred->uid != 0) {
info(udev_monitor->udev, "sender uid=%d, message ignored", cred->uid);
return NULL;
}
}
/* skip header */

1
udev/lib/libudev.h
View File

@ -70,6 +70,7 @@ extern int udev_devices_enumerate(struct udev *udev, const char *subsystem,
struct udev_monitor;
extern struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char *socket_path);
extern struct udev_monitor *udev_monitor_new_from_netlink(struct udev *udev);
extern int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor);
extern struct udev_monitor *udev_monitor_ref(struct udev_monitor *udev_monitor);
extern void udev_monitor_unref(struct udev_monitor *udev_monitor);