+/*
+ * Copyright (C) 2005-2008 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 version 2 of the License.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "../udev.h"
+#include "libudev.h"
+#include "libudev-private.h"
+
+#define UDEV_CTRL_MAGIC "udevd-128"
+
+enum udev_ctrl_msg_type {
+ UDEV_CTRL_UNKNOWN,
+ UDEV_CTRL_SET_LOG_LEVEL,
+ UDEV_CTRL_STOP_EXEC_QUEUE,
+ UDEV_CTRL_START_EXEC_QUEUE,
+ UDEV_CTRL_RELOAD_RULES,
+ UDEV_CTRL_SET_ENV,
+ UDEV_CTRL_SET_MAX_CHILDS,
+ UDEV_CTRL_SET_MAX_CHILDS_RUNNING,
+};
+
+struct ctrl_msg {
+ char magic[32];
+ enum udev_ctrl_msg_type type;
+ union {
+ int intval;
+ char buf[256];
+ };
+};
+
+struct udev_ctrl_msg {
+ int refcount;
+ struct udev_ctrl *uctrl;
+ struct ctrl_msg ctrl_msg;
+};
+
+struct udev_ctrl {
+ int refcount;
+ struct udev *udev;
+ int sock;
+ struct sockaddr_un saddr;
+ socklen_t addrlen;
+};
+
+struct udev_ctrl *udev_ctrl_new_from_socket(struct udev *udev, const char *socket_path)
+{
+ struct udev_ctrl *uctrl;
+
+ uctrl = malloc(sizeof(struct udev_ctrl));
+ if (uctrl == NULL)
+ return NULL;
+ memset(uctrl, 0x00, sizeof(struct udev_ctrl));
+ uctrl->refcount = 1;
+ uctrl->udev = udev;
+
+ uctrl->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+ if (uctrl->sock < 0) {
+ err(udev, "error getting socket: %s\n", strerror(errno));
+ udev_ctrl_unref(uctrl);
+ return NULL;
+ }
+
+ uctrl->saddr.sun_family = AF_LOCAL;
+ strcpy(uctrl->saddr.sun_path, socket_path);
+ uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.sun_path);
+ /* translate leading '@' to abstract namespace */
+ if (uctrl->saddr.sun_path[0] == '@')
+ uctrl->saddr.sun_path[0] = '\0';
+
+ return uctrl;
+}
+
+int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl)
+{
+ int err;
+ const int feature_on = 1;
+
+ err= bind(uctrl->sock, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
+ if (err < 0) {
+ err(uctrl->udev, "bind failed: %s\n", strerror(errno));
+ return err;
+ }
+
+ /* enable receiving of the sender credentials */
+ setsockopt(uctrl->sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
+ return 0;
+}
+
+struct udev *udev_ctrl_get_udev(struct udev_ctrl *uctrl)
+{
+ return uctrl->udev;
+}
+
+struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl)
+{
+ if (uctrl == NULL)
+ return NULL;
+ uctrl->refcount++;
+ return uctrl;
+}
+
+void udev_ctrl_unref(struct udev_ctrl *uctrl)
+{
+ if (uctrl == NULL)
+ return;
+ uctrl->refcount--;
+ if (uctrl->refcount > 0)
+ return;
+ if (uctrl->sock >= 0)
+ close(uctrl->sock);
+ free(uctrl);
+}
+
+int udev_ctrl_get_fd(struct udev_ctrl *uctrl)
+{
+ if (uctrl == NULL)
+ return -1;
+ return uctrl->sock;
+}
+
+static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf)
+{
+ struct ctrl_msg ctrl_msg;
+ int err;
+
+ memset(&ctrl_msg, 0x00, sizeof(struct ctrl_msg));
+ strcpy(ctrl_msg.magic, UDEV_CTRL_MAGIC);
+ ctrl_msg.type = type;
+
+ if (buf != NULL)
+ strlcpy(ctrl_msg.buf, buf, sizeof(ctrl_msg.buf));
+ else
+ ctrl_msg.intval = intval;
+
+ err = sendto(uctrl->sock, &ctrl_msg, sizeof(ctrl_msg), 0, (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
+ if (err == -1) {
+ err(uctrl->udev, "error sending message: %s\n", strerror(errno));
+ }
+ return err;
+}
+
+int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority)
+{
+ ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL);
+ return 0;
+}
+
+int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl)
+{
+ ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL);
+ return 0;
+}
+
+int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl)
+{
+ ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL);
+ return 0;
+}
+
+int udev_ctrl_send_reload_rules(struct udev_ctrl *uctrl)
+{
+ ctrl_send(uctrl, UDEV_CTRL_RELOAD_RULES, 0, NULL);
+ return 0;
+}
+
+int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key)
+{
+ ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, optarg);
+ return 0;
+}
+
+int udev_ctrl_send_set_max_childs(struct udev_ctrl *uctrl, int count)
+{
+ ctrl_send(uctrl, UDEV_CTRL_SET_MAX_CHILDS, count, NULL);
+ return 0;
+}
+
+int udev_ctrl_send_set_max_childs_running(struct udev_ctrl *uctrl, int count)
+{
+ ctrl_send(uctrl, UDEV_CTRL_SET_MAX_CHILDS_RUNNING, count, NULL);
+ return 0;
+}
+
+struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl *uctrl)
+{
+ struct udev_ctrl_msg *uctrl_msg;
+ ssize_t size;
+ struct msghdr smsg;
+ struct cmsghdr *cmsg;
+ struct iovec iov;
+ struct ucred *cred;
+ char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
+
+ uctrl_msg = malloc(sizeof(struct udev_ctrl_msg));
+ if (uctrl_msg == NULL)
+ return NULL;
+ memset(uctrl_msg, 0x00, sizeof(struct udev_ctrl_msg));
+ uctrl_msg->refcount = 1;
+ uctrl_msg->uctrl = uctrl;
+
+ iov.iov_base = &uctrl_msg->ctrl_msg;
+ iov.iov_len = sizeof(struct udev_ctrl_msg);
+
+ memset(&smsg, 0x00, sizeof(struct msghdr));
+ smsg.msg_iov = &iov;
+ smsg.msg_iovlen = 1;
+ smsg.msg_control = cred_msg;
+ smsg.msg_controllen = sizeof(cred_msg);
+
+ size = recvmsg(uctrl->sock, &smsg, 0);
+ if (size < 0) {
+ err(uctrl->udev, "unable to receive user udevd message: %s\n", strerror(errno));
+ goto err;
+ }
+ cmsg = CMSG_FIRSTHDR(&smsg);
+ cred = (struct ucred *) CMSG_DATA(cmsg);
+
+ if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
+ err(uctrl->udev, "no sender credentials received, message ignored\n");
+ goto err;
+ }
+
+ if (cred->uid != 0) {
+ err(uctrl->udev, "sender uid=%i, message ignored\n", cred->uid);
+ goto err;
+ }
+
+ if (strncmp(uctrl_msg->ctrl_msg.magic, UDEV_CTRL_MAGIC, sizeof(UDEV_CTRL_MAGIC)) != 0 ) {
+ err(uctrl->udev, "message magic '%s' doesn't match, ignore it\n", uctrl_msg->ctrl_msg.magic);
+ goto err;
+ }
+
+ info(uctrl->udev, "created ctrl_msg %p (%i)\n", uctrl_msg, uctrl_msg->ctrl_msg.type);
+ return uctrl_msg;
+err:
+ udev_ctrl_msg_unref(uctrl_msg);
+ return NULL;
+}
+
+struct udev_ctrl_msg *udev_ctrl_msg_ref(struct udev_ctrl_msg *ctrl_msg)
+{
+ if (ctrl_msg == NULL)
+ return NULL;
+ ctrl_msg->refcount++;
+ return ctrl_msg;
+}
+
+void udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg)
+{
+ if (ctrl_msg == NULL)
+ return;
+ ctrl_msg->refcount--;
+ if (ctrl_msg->refcount > 0)
+ return;
+ info(ctrl_msg->uctrl->udev, "release ctrl_msg %p\n", ctrl_msg);
+ free(ctrl_msg);
+}
+
+int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg)
+{
+ if (ctrl_msg->ctrl_msg.type == UDEV_CTRL_SET_LOG_LEVEL)
+ return ctrl_msg->ctrl_msg.intval;
+ return -1;
+}
+
+int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg)
+{
+ if (ctrl_msg->ctrl_msg.type == UDEV_CTRL_STOP_EXEC_QUEUE)
+ return 1;
+ return -1;
+}
+
+int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg)
+{
+ if (ctrl_msg->ctrl_msg.type == UDEV_CTRL_START_EXEC_QUEUE)
+ return 1;
+ return -1;
+}
+
+int udev_ctrl_get_reload_rules(struct udev_ctrl_msg *ctrl_msg)
+{
+ if (ctrl_msg->ctrl_msg.type == UDEV_CTRL_RELOAD_RULES)
+ return 1;
+ return -1;
+}
+
+const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg)
+{
+ if (ctrl_msg->ctrl_msg.type == UDEV_CTRL_SET_ENV)
+ return ctrl_msg->ctrl_msg.buf;
+ return NULL;
+}
+
+int udev_ctrl_get_set_max_childs(struct udev_ctrl_msg *ctrl_msg)
+{
+ if (ctrl_msg->ctrl_msg.type == UDEV_CTRL_SET_MAX_CHILDS)
+ return ctrl_msg->ctrl_msg.intval;
+ return -1;
+}
+
+int udev_ctrl_get_set_max_childs_running(struct udev_ctrl_msg *ctrl_msg)
+{
+ if (ctrl_msg->ctrl_msg.type == UDEV_CTRL_SET_MAX_CHILDS_RUNNING)
+ return ctrl_msg->ctrl_msg.intval;
+ return -1;
+}
~ianmdlvl / elogind.git / commitdiff