439 lines
13 KiB
C
439 lines
13 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+
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*
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* libudev - interface to udev device information
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*/
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#include <errno.h>
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#include <poll.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "format-util.h"
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#include "socket-util.h"
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#include "strxcpyx.h"
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#include "udev-ctrl.h"
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/* wire protocol magic must match */
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#define UDEV_CTRL_MAGIC 0xdead1dea
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enum udev_ctrl_msg_type {
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UDEV_CTRL_UNKNOWN,
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UDEV_CTRL_SET_LOG_LEVEL,
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UDEV_CTRL_STOP_EXEC_QUEUE,
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UDEV_CTRL_START_EXEC_QUEUE,
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UDEV_CTRL_RELOAD,
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UDEV_CTRL_SET_ENV,
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UDEV_CTRL_SET_CHILDREN_MAX,
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UDEV_CTRL_PING,
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UDEV_CTRL_EXIT,
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};
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struct udev_ctrl_msg_wire {
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char version[16];
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unsigned magic;
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enum udev_ctrl_msg_type type;
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union {
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int intval;
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char buf[256];
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};
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};
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struct udev_ctrl_msg {
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unsigned n_ref;
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struct udev_ctrl_connection *conn;
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struct udev_ctrl_msg_wire ctrl_msg_wire;
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};
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struct udev_ctrl {
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unsigned n_ref;
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int sock;
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union sockaddr_union saddr;
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socklen_t addrlen;
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bool bound;
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bool cleanup_socket;
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bool connected;
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};
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struct udev_ctrl_connection {
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unsigned n_ref;
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struct udev_ctrl *uctrl;
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int sock;
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};
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struct udev_ctrl *udev_ctrl_new_from_fd(int fd) {
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struct udev_ctrl *uctrl;
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int r;
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uctrl = new0(struct udev_ctrl, 1);
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if (uctrl == NULL)
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return NULL;
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uctrl->n_ref = 1;
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if (fd < 0) {
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uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0);
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if (uctrl->sock < 0) {
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log_error_errno(errno, "error getting socket: %m");
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udev_ctrl_unref(uctrl);
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return NULL;
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}
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} else {
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uctrl->bound = true;
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uctrl->sock = fd;
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}
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/*
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* FIXME: remove it as soon as we can depend on this:
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* http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=90c6bd34f884cd9cee21f1d152baf6c18bcac949
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*/
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r = setsockopt_int(uctrl->sock, SOL_SOCKET, SO_PASSCRED, true);
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if (r < 0)
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log_warning_errno(r, "could not set SO_PASSCRED: %m");
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uctrl->saddr.un = (struct sockaddr_un) {
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.sun_family = AF_UNIX,
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.sun_path = "/run/udev/control",
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};
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uctrl->addrlen = SOCKADDR_UN_LEN(uctrl->saddr.un);
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return uctrl;
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}
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struct udev_ctrl *udev_ctrl_new(void) {
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return udev_ctrl_new_from_fd(-1);
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}
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int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl) {
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int err;
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if (!uctrl->bound) {
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err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen);
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if (err < 0 && errno == EADDRINUSE) {
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(void) sockaddr_un_unlink(&uctrl->saddr.un);
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err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen);
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}
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if (err < 0)
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return log_error_errno(errno, "bind failed: %m");
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err = listen(uctrl->sock, 0);
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if (err < 0)
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return log_error_errno(errno, "listen failed: %m");
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uctrl->bound = true;
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uctrl->cleanup_socket = true;
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}
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return 0;
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}
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static struct udev_ctrl *udev_ctrl_free(struct udev_ctrl *uctrl) {
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assert(uctrl);
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safe_close(uctrl->sock);
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return mfree(uctrl);
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}
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DEFINE_PRIVATE_TRIVIAL_REF_FUNC(struct udev_ctrl, udev_ctrl);
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DEFINE_TRIVIAL_UNREF_FUNC(struct udev_ctrl, udev_ctrl, udev_ctrl_free);
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int udev_ctrl_cleanup(struct udev_ctrl *uctrl) {
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if (uctrl == NULL)
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return 0;
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if (uctrl->cleanup_socket)
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sockaddr_un_unlink(&uctrl->saddr.un);
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return 0;
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}
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int udev_ctrl_get_fd(struct udev_ctrl *uctrl) {
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if (uctrl == NULL)
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return -EINVAL;
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return uctrl->sock;
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}
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struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) {
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struct udev_ctrl_connection *conn;
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struct ucred ucred = {};
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int r;
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conn = new(struct udev_ctrl_connection, 1);
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if (conn == NULL)
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return NULL;
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conn->n_ref = 1;
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conn->uctrl = uctrl;
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conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK);
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if (conn->sock < 0) {
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if (errno != EINTR)
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log_error_errno(errno, "unable to receive ctrl connection: %m");
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goto err;
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}
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/* check peer credential of connection */
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r = getpeercred(conn->sock, &ucred);
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if (r < 0) {
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log_error_errno(r, "unable to receive credentials of ctrl connection: %m");
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goto err;
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}
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if (ucred.uid > 0) {
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log_error("sender uid="UID_FMT", message ignored", ucred.uid);
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goto err;
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}
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/* enable receiving of the sender credentials in the messages */
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r = setsockopt_int(conn->sock, SOL_SOCKET, SO_PASSCRED, true);
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if (r < 0)
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log_warning_errno(r, "could not set SO_PASSCRED: %m");
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udev_ctrl_ref(uctrl);
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return conn;
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err:
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safe_close(conn->sock);
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return mfree(conn);
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}
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static struct udev_ctrl_connection *udev_ctrl_connection_free(struct udev_ctrl_connection *conn) {
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assert(conn);
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safe_close(conn->sock);
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udev_ctrl_unref(conn->uctrl);
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return mfree(conn);
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}
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DEFINE_TRIVIAL_REF_UNREF_FUNC(struct udev_ctrl_connection, udev_ctrl_connection, udev_ctrl_connection_free);
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static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout) {
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struct udev_ctrl_msg_wire ctrl_msg_wire;
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int err = 0;
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memzero(&ctrl_msg_wire, sizeof(struct udev_ctrl_msg_wire));
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strcpy(ctrl_msg_wire.version, "udev-" PACKAGE_VERSION);
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ctrl_msg_wire.magic = UDEV_CTRL_MAGIC;
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ctrl_msg_wire.type = type;
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if (buf != NULL)
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strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf);
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else
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ctrl_msg_wire.intval = intval;
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if (!uctrl->connected) {
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if (connect(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen) < 0) {
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err = -errno;
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goto out;
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}
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uctrl->connected = true;
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}
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if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) {
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err = -errno;
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goto out;
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}
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/* wait for peer message handling or disconnect */
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for (;;) {
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struct pollfd pfd[1];
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int r;
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pfd[0].fd = uctrl->sock;
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pfd[0].events = POLLIN;
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r = poll(pfd, 1, timeout * MSEC_PER_SEC);
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if (r < 0) {
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if (errno == EINTR)
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continue;
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err = -errno;
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break;
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}
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if (r > 0 && pfd[0].revents & POLLERR) {
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err = -EIO;
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break;
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}
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if (r == 0)
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err = -ETIMEDOUT;
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break;
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}
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out:
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return err;
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}
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int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout) {
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return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout);
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}
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int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout) {
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return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout);
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}
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int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout) {
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return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout);
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}
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int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout) {
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return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout);
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}
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int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout) {
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return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout);
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}
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int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout) {
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return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout);
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}
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int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout) {
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return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout);
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}
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int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout) {
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return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout);
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}
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struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) {
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struct udev_ctrl_msg *uctrl_msg;
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ssize_t size;
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struct cmsghdr *cmsg;
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struct iovec iov;
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char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
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struct msghdr smsg = {
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.msg_iov = &iov,
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.msg_iovlen = 1,
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.msg_control = cred_msg,
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.msg_controllen = sizeof(cred_msg),
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};
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struct ucred *cred;
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uctrl_msg = new0(struct udev_ctrl_msg, 1);
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if (uctrl_msg == NULL)
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return NULL;
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uctrl_msg->n_ref = 1;
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uctrl_msg->conn = conn;
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udev_ctrl_connection_ref(conn);
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/* wait for the incoming message */
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for (;;) {
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struct pollfd pfd[1];
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int r;
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pfd[0].fd = conn->sock;
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pfd[0].events = POLLIN;
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r = poll(pfd, 1, 10000);
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if (r < 0) {
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if (errno == EINTR)
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continue;
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goto err;
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} else if (r == 0) {
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log_error("timeout waiting for ctrl message");
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goto err;
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} else {
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if (!(pfd[0].revents & POLLIN)) {
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log_error_errno(errno, "ctrl connection error: %m");
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goto err;
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}
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}
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break;
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}
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iov.iov_base = &uctrl_msg->ctrl_msg_wire;
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iov.iov_len = sizeof(struct udev_ctrl_msg_wire);
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size = recvmsg(conn->sock, &smsg, 0);
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if (size < 0) {
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log_error_errno(errno, "unable to receive ctrl message: %m");
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goto err;
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}
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cmsg_close_all(&smsg);
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cmsg = CMSG_FIRSTHDR(&smsg);
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if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
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log_error("no sender credentials received, message ignored");
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goto err;
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}
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cred = (struct ucred *) CMSG_DATA(cmsg);
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if (cred->uid != 0) {
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log_error("sender uid="UID_FMT", message ignored", cred->uid);
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goto err;
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}
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if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) {
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log_error("message magic 0x%08x doesn't match, ignore it", uctrl_msg->ctrl_msg_wire.magic);
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goto err;
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}
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return uctrl_msg;
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err:
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udev_ctrl_msg_unref(uctrl_msg);
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return NULL;
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}
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static struct udev_ctrl_msg *udev_ctrl_msg_free(struct udev_ctrl_msg *ctrl_msg) {
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assert(ctrl_msg);
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udev_ctrl_connection_unref(ctrl_msg->conn);
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return mfree(ctrl_msg);
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}
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DEFINE_TRIVIAL_UNREF_FUNC(struct udev_ctrl_msg, udev_ctrl_msg, udev_ctrl_msg_free);
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int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg) {
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if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_LOG_LEVEL)
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return ctrl_msg->ctrl_msg_wire.intval;
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return -1;
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}
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int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg) {
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if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_STOP_EXEC_QUEUE)
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return 1;
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return -1;
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}
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int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg) {
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if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_START_EXEC_QUEUE)
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return 1;
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return -1;
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}
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int udev_ctrl_get_reload(struct udev_ctrl_msg *ctrl_msg) {
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if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD)
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return 1;
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return -1;
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}
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const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg) {
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if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_ENV)
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return ctrl_msg->ctrl_msg_wire.buf;
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return NULL;
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}
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int udev_ctrl_get_set_children_max(struct udev_ctrl_msg *ctrl_msg) {
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if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX)
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return ctrl_msg->ctrl_msg_wire.intval;
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return -1;
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}
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int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg) {
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if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING)
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return 1;
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return -1;
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}
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int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg) {
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if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT)
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return 1;
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return -1;
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}
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