1 files changed, 321 insertions, 0 deletions
diff --git a/libudev/libudev-ctrl.c b/libudev/libudev-ctrl.c
new file mode 100644
index 0000000000..e47b2b66dc
--- /dev/null
+++ b/libudev/libudev-ctrl.c
@@ -0,0 +1,321 @@
+/*
+ * libudev - interface to udev device information
+ *
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * 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 <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 "libudev.h"
+#include "libudev-private.h"
+
+/* wire protocol magic must match */
+#define UDEV_CTRL_MAGIC				0xdead1dea
+
+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,
+	UDEV_CTRL_SETTLE,
+};
+
+struct udev_ctrl_msg_wire {
+	char version[16];
+	unsigned int magic;
+	enum udev_ctrl_msg_type type;
+	union {
+		int intval;
+		char buf[256];
+	};
+};
+
+struct udev_ctrl_msg {
+	int refcount;
+	struct udev_ctrl *uctrl;
+	struct udev_ctrl_msg_wire ctrl_msg_wire;
+	pid_t pid;
+};
+
+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 = calloc(1, sizeof(struct udev_ctrl));
+	if (uctrl == NULL)
+		return NULL;
+	uctrl->refcount = 1;
+	uctrl->udev = udev;
+
+	uctrl->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+	if (uctrl->sock < 0) {
+		err(udev, "error getting socket: %m\n");
+		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: %m\n");
+		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 udev_ctrl_msg_wire ctrl_msg_wire;
+	int err;
+
+	memset(&ctrl_msg_wire, 0x00, sizeof(struct udev_ctrl_msg_wire));
+	strcpy(ctrl_msg_wire.version, "udev-" VERSION);
+	ctrl_msg_wire.magic = UDEV_CTRL_MAGIC;
+	ctrl_msg_wire.type = type;
+
+	if (buf != NULL)
+		util_strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf);
+	else
+		ctrl_msg_wire.intval = intval;
+
+	err = sendto(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0,
+		     (struct sockaddr *)&uctrl->saddr, uctrl->addrlen);
+	if (err == -1) {
+		err(uctrl->udev, "error sending message: %m\n");
+	}
+	return err;
+}
+
+int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority)
+{
+	return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL);
+}
+
+int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl)
+{
+	return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL);
+}
+
+int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl)
+{
+	return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL);
+}
+
+int udev_ctrl_send_reload_rules(struct udev_ctrl *uctrl)
+{
+	return ctrl_send(uctrl, UDEV_CTRL_RELOAD_RULES, 0, NULL);
+}
+
+int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key)
+{
+	return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key);
+}
+
+int udev_ctrl_send_set_max_childs(struct udev_ctrl *uctrl, int count)
+{
+	return ctrl_send(uctrl, UDEV_CTRL_SET_MAX_CHILDS, count, NULL);
+}
+
+int udev_ctrl_send_settle(struct udev_ctrl *uctrl)
+{
+	return ctrl_send(uctrl, UDEV_CTRL_SETTLE, 0, NULL);
+}
+
+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 = calloc(1, sizeof(struct udev_ctrl_msg));
+	if (uctrl_msg == NULL)
+		return NULL;
+	uctrl_msg->refcount = 1;
+	uctrl_msg->uctrl = uctrl;
+
+	iov.iov_base = &uctrl_msg->ctrl_msg_wire;
+	iov.iov_len = sizeof(struct udev_ctrl_msg_wire);
+
+	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: %m\n");
+		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;
+	}
+
+	uctrl_msg->pid = cred->pid;
+
+	if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) {
+		err(uctrl->udev, "message magic 0x%08x doesn't match, ignore it\n", uctrl_msg->ctrl_msg_wire.magic);
+		goto err;
+	}
+
+	dbg(uctrl->udev, "created ctrl_msg %p (%i)\n", uctrl_msg, uctrl_msg->ctrl_msg_wire.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;
+	dbg(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_wire.type == UDEV_CTRL_SET_LOG_LEVEL)
+		return ctrl_msg->ctrl_msg_wire.intval;
+	return -1;
+}
+
+int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg)
+{
+	if (ctrl_msg->ctrl_msg_wire.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_wire.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_wire.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_wire.type == UDEV_CTRL_SET_ENV)
+		return ctrl_msg->ctrl_msg_wire.buf;
+	return NULL;
+}
+
+int udev_ctrl_get_set_max_childs(struct udev_ctrl_msg *ctrl_msg)
+{
+	if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_MAX_CHILDS)
+		return ctrl_msg->ctrl_msg_wire.intval;
+	return -1;
+}
+
+pid_t udev_ctrl_get_settle(struct udev_ctrl_msg *ctrl_msg)
+{
+	if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SETTLE)
+		return ctrl_msg->pid;
+	return -1;
+}