*
* 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 "config.h"
-
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
+#include <sys/poll.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
+#include <arpa/inet.h>
+#include <linux/netlink.h>
+#include <linux/filter.h>
#include "libudev.h"
#include "libudev-private.h"
-#include "../udev.h"
struct udev_monitor {
struct udev *udev;
int refcount;
- int socket;
+ int sock;
+ struct sockaddr_nl snl;
+ struct sockaddr_nl snl_peer;
+ struct sockaddr_un sun;
+ socklen_t addrlen;
+ struct udev_list_node filter_subsystem_list;
+};
+
+enum udev_monitor_netlink_group {
+ UDEV_MONITOR_KERNEL = 1,
+ UDEV_MONITOR_UDEV = 2,
+};
+
+#define UDEV_MONITOR_MAGIC 0xcafe1dea
+struct udev_monitor_netlink_header {
+ /* udev version text */
+ char version[16];
+ /*
+ * magic to protect against daemon <-> library message format mismatch
+ * used in the kernel from socket filter rules; needs to be stored in network order
+ */
+ unsigned int magic;
+ /* properties buffer */
+ unsigned short properties_off;
+ unsigned short properties_len;
+ /*
+ * hashes of some common device properties strings to filter with socket filters in
+ * the client used in the kernel from socket filter rules; needs to be stored in
+ * network order
+ */
+ unsigned int filter_subsystem;
+ unsigned int filter_devtype;
};
+static struct udev_monitor *udev_monitor_new(struct udev *udev)
+{
+ struct udev_monitor *udev_monitor;
+
+ udev_monitor = calloc(1, sizeof(struct udev_monitor));
+ if (udev_monitor == NULL)
+ return NULL;
+ udev_monitor->refcount = 1;
+ udev_monitor->udev = udev;
+ udev_list_init(&udev_monitor->filter_subsystem_list);
+ return udev_monitor;
+}
+
/**
* 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 sockaddr_un saddr;
- socklen_t addrlen;
- const int on = 1;
+ struct stat statbuf;
if (udev == NULL)
return NULL;
if (socket_path == NULL)
return NULL;
- udev_monitor = malloc(sizeof(struct udev_monitor));
+ udev_monitor = udev_monitor_new(udev);
if (udev_monitor == NULL)
return NULL;
- memset(udev_monitor, 0x00, sizeof(struct udev_monitor));
- udev_monitor->refcount = 1;
- udev_monitor->udev = udev;
-
- memset(&saddr, 0x00, sizeof(saddr));
- saddr.sun_family = AF_LOCAL;
- strcpy(saddr.sun_path, socket_path);
- addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path);
- /* translate leading '@' to abstract namespace */
- if (saddr.sun_path[0] == '@')
- saddr.sun_path[0] = '\0';
-
- udev_monitor->socket = socket(AF_LOCAL, SOCK_DGRAM, 0);
- if (udev_monitor->socket == -1) {
- log_err(udev, "error getting socket: %s\n", strerror(errno));
+ udev_monitor->sun.sun_family = AF_LOCAL;
+ 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;
}
+ util_set_fd_cloexec(udev_monitor->sock);
+
+ dbg(udev, "monitor %p created with '%s'\n", udev_monitor, socket_path);
+ return udev_monitor;
+}
- if (bind(udev_monitor->socket, (struct sockaddr *) &saddr, addrlen) < 0) {
- log_err(udev, "bind failed: %s\n", strerror(errno));
- close(udev_monitor->socket);
+/**
+ * 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;
+
+ 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 = udev_monitor_new(udev);
+ if (udev_monitor == NULL)
+ return NULL;
+
+ udev_monitor->sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
+ if (udev_monitor->sock == -1) {
+ err(udev, "error getting socket: %m\n");
free(udev_monitor);
return NULL;
}
+ util_set_fd_cloexec(udev_monitor->sock);
- /* enable receiving of the sender credentials */
- setsockopt(udev_monitor->socket, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
- log_info(udev_monitor->udev, "udev_monitor: %p created\n", udev_monitor);
+ udev_monitor->snl.nl_family = AF_NETLINK;
+ udev_monitor->snl.nl_groups = group;
+ udev_monitor->snl_peer.nl_family = AF_NETLINK;
+ udev_monitor->snl_peer.nl_groups = UDEV_MONITOR_UDEV;
+ dbg(udev, "monitor %p created with NETLINK_KOBJECT_UEVENT (%u)\n", udev_monitor, group);
return udev_monitor;
}
+static inline void bpf_stmt(struct sock_filter *inss, unsigned int *i,
+ unsigned short code, unsigned int data)
+{
+ struct sock_filter *ins = &inss[*i];
+
+ ins->code = code;
+ ins->k = data;
+ (*i)++;
+}
+
+static inline void bpf_jmp(struct sock_filter *inss, unsigned int *i,
+ unsigned short code, unsigned int data,
+ unsigned short jt, unsigned short jf)
+{
+ struct sock_filter *ins = &inss[*i];
+
+ ins->code = code;
+ ins->jt = jt;
+ ins->jf = jf;
+ ins->k = data;
+ (*i)++;
+}
+
+int udev_monitor_filter_update(struct udev_monitor *udev_monitor)
+{
+ static struct sock_filter ins[256];
+ static struct sock_fprog filter;
+ unsigned int i;
+ struct udev_list_entry *list_entry;
+ int err;
+
+ if (udev_list_get_entry(&udev_monitor->filter_subsystem_list) == NULL)
+ return 0;
+
+ memset(ins, 0x00, sizeof(ins));
+ i = 0;
+
+ /* load magic in A */
+ bpf_stmt(ins, &i, BPF_LD|BPF_W|BPF_ABS, offsetof(struct udev_monitor_netlink_header, magic));
+ /* jump if magic matches */
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, UDEV_MONITOR_MAGIC, 1, 0);
+ /* wrong magic, pass packet */
+ bpf_stmt(ins, &i, BPF_RET|BPF_K, 0xffffffff);
+
+ /* add all subsystem match values */
+ udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_monitor->filter_subsystem_list)) {
+ unsigned int hash;
+
+ /* load filter_subsystem value in A */
+ bpf_stmt(ins, &i, BPF_LD|BPF_W|BPF_ABS, offsetof(struct udev_monitor_netlink_header, filter_subsystem));
+ hash = util_string_hash32(udev_list_entry_get_name(list_entry));
+ if (udev_list_entry_get_value(list_entry) == NULL) {
+ /* jump if subsystem does not match */
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, hash, 0, 1);
+ } else {
+ /* jump if subsystem does not match */
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, hash, 0, 3);
+
+ /* load filter_devtype value in A */
+ bpf_stmt(ins, &i, BPF_LD|BPF_W|BPF_ABS, offsetof(struct udev_monitor_netlink_header, filter_devtype));
+ /* jump if value does not match */
+ hash = util_string_hash32(udev_list_entry_get_value(list_entry));
+ bpf_jmp(ins, &i, BPF_JMP|BPF_JEQ|BPF_K, hash, 0, 1);
+ }
+
+ /* matched, pass packet */
+ bpf_stmt(ins, &i, BPF_RET|BPF_K, 0xffffffff);
+
+ if (i+1 >= ARRAY_SIZE(ins))
+ return -1;
+ }
+ /* nothing matched, drop packet */
+ bpf_stmt(ins, &i, BPF_RET|BPF_K, 0);
+
+ /* install filter */
+ filter.len = i;
+ filter.filter = ins;
+ err = setsockopt(udev_monitor->sock, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter));
+ return err;
+}
+
+int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
+{
+ int err;
+ const int on = 1;
+
+ 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) {
+ udev_monitor_filter_update(udev_monitor);
+ 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: udev monitor
*
* Drop a reference of a udev monitor. If the refcount reaches zero,
- * the bound socket will be closed, and the ressources of the monitor
+ * the bound socket will be closed, and the resources of the monitor
* will be released.
*
**/
udev_monitor->refcount--;
if (udev_monitor->refcount > 0)
return;
- close(udev_monitor->socket);
- log_info(udev_monitor->udev, "udev_monitor: %p released\n", udev_monitor);
+ if (udev_monitor->sock >= 0)
+ close(udev_monitor->sock);
+ udev_list_cleanup_entries(udev_monitor->udev, &udev_monitor->filter_subsystem_list);
+ dbg(udev_monitor->udev, "monitor %p released\n", udev_monitor);
free(udev_monitor);
}
* udev_monitor_get_udev:
* @udev_monitor: udev monitor
*
- * Retrieve the udev library context the device was created with.
+ * Retrieve the udev library context the monitor was created with.
*
* Returns: the udev library context
**/
{
if (udev_monitor == NULL)
return -1;
- return udev_monitor->socket;
+ return udev_monitor->sock;
+}
+
+static int passes_filter(struct udev_monitor *udev_monitor, struct udev_device *udev_device)
+{
+ struct udev_list_entry *list_entry;
+
+ if (udev_list_get_entry(&udev_monitor->filter_subsystem_list) == NULL)
+ return 1;
+
+ udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_monitor->filter_subsystem_list)) {
+ const char *subsys = udev_list_entry_get_name(list_entry);
+ const char *dsubsys = udev_device_get_subsystem(udev_device);
+ const char *devtype;
+ const char *ddevtype;
+
+ if (strcmp(dsubsys, subsys) != 0)
+ continue;
+
+ devtype = udev_list_entry_get_value(list_entry);
+ if (devtype == NULL)
+ return 1;
+ ddevtype = udev_device_get_devtype(udev_device);
+ if (ddevtype == NULL)
+ continue;
+ if (strcmp(ddevtype, devtype) == 0)
+ return 1;
+ }
+ return 0;
}
/**
- * udev_monitor_get_device:
+ * udev_monitor_receive_device:
* @udev_monitor: udev monitor
*
- * Retrieve data from the udev monitor socket, allocate a new udev
- * device, and fill in the received data, and return the device.
+ * Receive data from the udev monitor socket, allocate a new udev
+ * device, fill in the received data, and return the device.
*
* Only socket connections with uid=0 are accepted. The caller
- * need 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 udev_device *udev_monitor_get_device(struct udev_monitor *udev_monitor)
+struct udev_device *udev_monitor_receive_device(struct udev_monitor *udev_monitor)
{
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;
+ struct cmsghdr *cmsg;
+ struct sockaddr_nl snl;
+ struct ucred *cred;
+ char buf[8192];
+ ssize_t buflen;
+ ssize_t bufpos;
+ struct udev_monitor_netlink_header *nlh;
+ int devpath_set = 0;
+ int subsystem_set = 0;
+ int action_set = 0;
+ int maj = 0;
+ int min = 0;
+retry:
if (udev_monitor == NULL)
return NULL;
memset(buf, 0x00, sizeof(buf));
smsg.msg_control = cred_msg;
smsg.msg_controllen = sizeof(cred_msg);
- if (recvmsg(udev_monitor->socket, &smsg, 0) < 0) {
+ if (udev_monitor->snl.nl_family != 0) {
+ smsg.msg_name = &snl;
+ smsg.msg_namelen = sizeof(snl);
+ }
+
+ buflen = recvmsg(udev_monitor->sock, &smsg, 0);
+ if (buflen < 0) {
if (errno != EINTR)
- log_info(udev_monitor->udev, "unable to receive message");
+ info(udev_monitor->udev, "unable to receive message\n");
return NULL;
}
- cmsg = CMSG_FIRSTHDR(&smsg);
- cred = (struct ucred *)CMSG_DATA (cmsg);
- if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
- log_info(udev_monitor->udev, "no sender credentials received, message ignored");
+ if (buflen < 32 || (size_t)buflen >= sizeof(buf)) {
+ info(udev_monitor->udev, "invalid message length\n");
return NULL;
}
- if (cred->uid != 0) {
- log_info(udev_monitor->udev, "sender uid=%d, message ignored", cred->uid);
- return NULL;
+ if (udev_monitor->snl.nl_family != 0) {
+ if (snl.nl_groups == 0) {
+ info(udev_monitor->udev, "unicast netlink message ignored\n");
+ return NULL;
+ }
+ 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;
+ }
}
- /* skip header */
- bufpos = strlen(buf) + 1;
- if (bufpos < sizeof("a@/d") || bufpos >= sizeof(buf)) {
- log_info(udev_monitor->udev, "invalid message length");
+ 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;
}
- /* check message header */
- if (strstr(buf, "@/") == NULL) {
- log_info(udev_monitor->udev, "unrecognized message header");
+ cred = (struct ucred *)CMSG_DATA(cmsg);
+ if (cred->uid != 0) {
+ info(udev_monitor->udev, "sender uid=%d, message ignored\n", cred->uid);
return NULL;
}
- udev_device = device_init(udev_monitor->udev);
+ if (strncmp(buf, "udev-", 5) == 0) {
+ /* udev message needs proper version magic */
+ nlh = (struct udev_monitor_netlink_header *) buf;
+ if (nlh->magic != htonl(UDEV_MONITOR_MAGIC))
+ return NULL;
+ if (nlh->properties_off < sizeof(struct udev_monitor_netlink_header))
+ return NULL;
+ if (nlh->properties_off+32U > buflen)
+ return NULL;
+ bufpos = nlh->properties_off;
+ } else {
+ /* kernel message with header */
+ bufpos = strlen(buf) + 1;
+ if ((size_t)bufpos < sizeof("a@/d") || bufpos >= buflen) {
+ info(udev_monitor->udev, "invalid message length\n");
+ return NULL;
+ }
+
+ /* check message header */
+ if (strstr(buf, "@/") == NULL) {
+ info(udev_monitor->udev, "unrecognized message header\n");
+ return NULL;
+ }
+ }
+
+ udev_device = device_new(udev_monitor->udev);
if (udev_device == NULL) {
return NULL;
}
- while (bufpos < sizeof(buf)) {
+ while (bufpos < buflen) {
char *key;
size_t keylen;
bufpos += keylen + 1;
if (strncmp(key, "DEVPATH=", 8) == 0) {
- udev_device->devpath = strdup(&key[8]);
+ char path[UTIL_PATH_SIZE];
+
+ 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->subsystem = strdup(&key[10]);
+ 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->devname = strdup(&key[8]);
+ 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';
- name_list_add(&udev_device->link_list, slink, 0);
+ udev_device_add_devlink(udev_device, slink);
slink = &next[1];
next = strchr(slink, ' ');
}
if (slink[0] != '\0')
- name_list_add(&udev_device->link_list, slink, 0);
+ udev_device_add_devlink(udev_device, slink);
+ } else if (strncmp(key, "DRIVER=", 7) == 0) {
+ 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) {
+ min = strtoull(&key[6], NULL, 10);
+ } else if (strncmp(key, "DEVPATH_OLD=", 12) == 0) {
+ udev_device_set_devpath_old(udev_device, &key[12]);
+ } else if (strncmp(key, "PHYSDEVPATH=", 12) == 0) {
+ udev_device_set_physdevpath(udev_device, &key[12]);
+ } else if (strncmp(key, "SEQNUM=", 7) == 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));
+ } else if (strncmp(key, "PHYSDEV", 7) == 0) {
+ /* skip deprecated values */
+ continue;
+ } else {
+ udev_device_add_property_from_string(udev_device, key);
}
- name_list_add(&udev_device->env_list, key, 0);
}
+ if (!devpath_set || !subsystem_set || !action_set) {
+ info(udev_monitor->udev, "missing values, skip\n");
+ udev_device_unref(udev_device);
+ return NULL;
+ }
+
+ /* skip device, if it does not pass the current filter */
+ if (!passes_filter(udev_monitor, udev_device)) {
+ struct pollfd pfd[1];
+ int rc;
+ udev_device_unref(udev_device);
+
+ /* if something is queued, get next device */
+ pfd[0].fd = udev_monitor->sock;
+ pfd[0].events = POLLIN;
+ rc = poll(pfd, 1, 0);
+ if (rc > 0)
+ goto retry;
+ 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)
+{
+ struct msghdr smsg;
+ struct iovec iov[2];
+ const char *buf;
+ ssize_t blen;
+ ssize_t count;
+
+ blen = udev_device_get_properties_monitor_buf(udev_device, &buf);
+ if (blen < 32)
+ return -1;
+
+ if (udev_monitor->sun.sun_family != 0) {
+ const char *action;
+ char header[2048];
+ size_t hlen;
+
+ /* header <action>@<devpath> */
+ action = udev_device_get_action(udev_device);
+ if (action == NULL)
+ return -EINVAL;
+ util_strlcpy(header, action, sizeof(header));
+ util_strlcat(header, "@", sizeof(header));
+ hlen = util_strlcat(header, udev_device_get_devpath(udev_device), sizeof(header))+1;
+ if (hlen >= sizeof(header))
+ return -EINVAL;
+ iov[0].iov_base = header;
+ iov[0].iov_len = hlen;
+
+ /* add properties list */
+ iov[1].iov_base = (char *)buf;
+ iov[1].iov_len = blen;
+
+ memset(&smsg, 0x00, sizeof(struct msghdr));
+ smsg.msg_iov = iov;
+ smsg.msg_iovlen = 2;
+ smsg.msg_name = &udev_monitor->sun;
+ smsg.msg_namelen = udev_monitor->addrlen;
+ } else if (udev_monitor->snl.nl_family != 0) {
+ const char *val;
+ struct udev_monitor_netlink_header nlh;
+
+
+ /* add versioned header */
+ memset(&nlh, 0x00, sizeof(struct udev_monitor_netlink_header));
+ util_strlcpy(nlh.version, "udev-" VERSION, sizeof(nlh.version));
+ nlh.magic = htonl(UDEV_MONITOR_MAGIC);
+ val = udev_device_get_subsystem(udev_device);
+ nlh.filter_subsystem = htonl(util_string_hash32(val));
+ val = udev_device_get_devtype(udev_device);
+ if (val != NULL)
+ nlh.filter_devtype = htonl(util_string_hash32(val));
+ iov[0].iov_base = &nlh;
+ iov[0].iov_len = sizeof(struct udev_monitor_netlink_header);
+
+ /* add properties list */
+ nlh.properties_off = iov[0].iov_len;
+ nlh.properties_len = blen;
+ iov[1].iov_base = (char *)buf;
+ iov[1].iov_len = blen;
+
+ memset(&smsg, 0x00, sizeof(struct msghdr));
+ smsg.msg_iov = iov;
+ smsg.msg_iovlen = 2;
+ /* no destination besides the muticast group, we will always get ECONNREFUSED */
+ smsg.msg_name = &udev_monitor->snl_peer;
+ smsg.msg_namelen = sizeof(struct sockaddr_nl);
+ } else {
+ return -1;
+ }
+
+ count = sendmsg(udev_monitor->sock, &smsg, 0);
+ info(udev_monitor->udev, "passed %zi bytes to monitor %p\n", count, udev_monitor);
+ return count;
+}
+
+int udev_monitor_filter_add_match_subsystem_devtype(struct udev_monitor *udev_monitor, const char *subsystem, const char *devtype)
+{
+ if (udev_monitor == NULL)
+ return -EINVAL;
+ if (subsystem == NULL)
+ return 0;
+ if (udev_list_entry_add(udev_monitor->udev,
+ &udev_monitor->filter_subsystem_list, subsystem, devtype, 0, 0) == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+int udev_monitor_filter_remove(struct udev_monitor *udev_monitor)
+{
+ static struct sock_fprog filter = { 0, NULL };
+
+ udev_list_cleanup_entries(udev_monitor->udev, &udev_monitor->filter_subsystem_list);
+ return setsockopt(udev_monitor->sock, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter));
+}
~ianmdlvl / elogind.git / blobdiff