+++ /dev/null
-/*
- * libudev - interface to udev device information
- *
- * Copyright (C) 2008 Kay Sievers <kay@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 <stdlib.h>
-#include <stddef.h>
-#include <string.h>
-#include <unistd.h>
-#include <poll.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-
-#include "socket-util.h"
-#include "udev.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,
- UDEV_CTRL_SET_ENV,
- UDEV_CTRL_SET_CHILDREN_MAX,
- UDEV_CTRL_PING,
- UDEV_CTRL_EXIT,
-};
-
-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_connection *conn;
- struct udev_ctrl_msg_wire ctrl_msg_wire;
-};
-
-struct udev_ctrl {
- int refcount;
- struct udev *udev;
- int sock;
- union sockaddr_union saddr;
- socklen_t addrlen;
- bool bound;
- bool cleanup_socket;
- bool connected;
-};
-
-struct udev_ctrl_connection {
- int refcount;
- struct udev_ctrl *uctrl;
- int sock;
-};
-
-struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd) {
- struct udev_ctrl *uctrl;
- const int on = 1;
- int r;
-
- uctrl = new0(struct udev_ctrl, 1);
- if (uctrl == NULL)
- return NULL;
- uctrl->refcount = 1;
- uctrl->udev = udev;
-
- if (fd < 0) {
- uctrl->sock = socket(AF_LOCAL, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0);
- if (uctrl->sock < 0) {
- log_error_errno(errno, "error getting socket: %m");
- udev_ctrl_unref(uctrl);
- return NULL;
- }
- } else {
- uctrl->bound = true;
- uctrl->sock = fd;
- }
- r = setsockopt(uctrl->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
- if (r < 0)
- log_warning_errno(errno, "could not set SO_PASSCRED: %m");
-
- uctrl->saddr.un.sun_family = AF_LOCAL;
- strscpy(uctrl->saddr.un.sun_path, sizeof(uctrl->saddr.un.sun_path), "/run/udev/control");
- uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.un.sun_path);
- return uctrl;
-}
-
-struct udev_ctrl *udev_ctrl_new(struct udev *udev) {
- return udev_ctrl_new_from_fd(udev, -1);
-}
-
-int udev_ctrl_enable_receiving(struct udev_ctrl *uctrl) {
- int err;
-
- if (!uctrl->bound) {
- err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen);
- if (err < 0 && errno == EADDRINUSE) {
- unlink(uctrl->saddr.un.sun_path);
- err = bind(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen);
- }
-
- if (err < 0) {
- err = -errno;
- log_error_errno(errno, "bind failed: %m");
- return err;
- }
-
- err = listen(uctrl->sock, 0);
- if (err < 0) {
- err = -errno;
- log_error_errno(errno, "listen failed: %m");
- return err;
- }
-
- uctrl->bound = true;
- uctrl->cleanup_socket = true;
- }
- return 0;
-}
-
-struct udev *udev_ctrl_get_udev(struct udev_ctrl *uctrl) {
- return uctrl->udev;
-}
-
-static struct udev_ctrl *udev_ctrl_ref(struct udev_ctrl *uctrl) {
- if (uctrl == NULL)
- return NULL;
- uctrl->refcount++;
- return uctrl;
-}
-
-struct udev_ctrl *udev_ctrl_unref(struct udev_ctrl *uctrl) {
- if (uctrl == NULL)
- return NULL;
- uctrl->refcount--;
- if (uctrl->refcount > 0)
- return uctrl;
- if (uctrl->sock >= 0)
- close(uctrl->sock);
- free(uctrl);
- return NULL;
-}
-
-int udev_ctrl_cleanup(struct udev_ctrl *uctrl) {
- if (uctrl == NULL)
- return 0;
- if (uctrl->cleanup_socket)
- unlink(uctrl->saddr.un.sun_path);
- return 0;
-}
-
-int udev_ctrl_get_fd(struct udev_ctrl *uctrl) {
- if (uctrl == NULL)
- return -EINVAL;
- return uctrl->sock;
-}
-
-struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) {
- struct udev_ctrl_connection *conn;
- struct ucred ucred = {};
- const int on = 1;
- int r;
-
- conn = new(struct udev_ctrl_connection, 1);
- if (conn == NULL)
- return NULL;
- conn->refcount = 1;
- conn->uctrl = uctrl;
-
- conn->sock = accept4(uctrl->sock, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK);
- if (conn->sock < 0) {
- if (errno != EINTR)
- log_error_errno(errno, "unable to receive ctrl connection: %m");
- goto err;
- }
-
- /* check peer credential of connection */
- r = getpeercred(conn->sock, &ucred);
- if (r < 0) {
- log_error_errno(r, "unable to receive credentials of ctrl connection: %m");
- goto err;
- }
- if (ucred.uid > 0) {
- log_error("sender uid="UID_FMT", message ignored", ucred.uid);
- goto err;
- }
-
- /* enable receiving of the sender credentials in the messages */
- r = setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
- if (r < 0)
- log_warning_errno(errno, "could not set SO_PASSCRED: %m");
-
- udev_ctrl_ref(uctrl);
- return conn;
-err:
- if (conn->sock >= 0)
- close(conn->sock);
- free(conn);
- return NULL;
-}
-
-struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn) {
- if (conn == NULL)
- return NULL;
- conn->refcount++;
- return conn;
-}
-
-struct udev_ctrl_connection *udev_ctrl_connection_unref(struct udev_ctrl_connection *conn) {
- if (conn == NULL)
- return NULL;
- conn->refcount--;
- if (conn->refcount > 0)
- return conn;
- if (conn->sock >= 0)
- close(conn->sock);
- udev_ctrl_unref(conn->uctrl);
- free(conn);
- return NULL;
-}
-
-static int ctrl_send(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, int intval, const char *buf, int timeout) {
- struct udev_ctrl_msg_wire ctrl_msg_wire;
- int err = 0;
-
- memzero(&ctrl_msg_wire, 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)
- strscpy(ctrl_msg_wire.buf, sizeof(ctrl_msg_wire.buf), buf);
- else
- ctrl_msg_wire.intval = intval;
-
- if (!uctrl->connected) {
- if (connect(uctrl->sock, &uctrl->saddr.sa, uctrl->addrlen) < 0) {
- err = -errno;
- goto out;
- }
- uctrl->connected = true;
- }
- if (send(uctrl->sock, &ctrl_msg_wire, sizeof(ctrl_msg_wire), 0) < 0) {
- err = -errno;
- goto out;
- }
-
- /* wait for peer message handling or disconnect */
- for (;;) {
- struct pollfd pfd[1];
- int r;
-
- pfd[0].fd = uctrl->sock;
- pfd[0].events = POLLIN;
- r = poll(pfd, 1, timeout * MSEC_PER_SEC);
- if (r < 0) {
- if (errno == EINTR)
- continue;
- err = -errno;
- break;
- }
-
- if (r > 0 && pfd[0].revents & POLLERR) {
- err = -EIO;
- break;
- }
-
- if (r == 0)
- err = -ETIMEDOUT;
- break;
- }
-out:
- return err;
-}
-
-int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout) {
- return ctrl_send(uctrl, UDEV_CTRL_SET_LOG_LEVEL, priority, NULL, timeout);
-}
-
-int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout) {
- return ctrl_send(uctrl, UDEV_CTRL_STOP_EXEC_QUEUE, 0, NULL, timeout);
-}
-
-int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout) {
- return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout);
-}
-
-int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout) {
- return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout);
-}
-
-int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout) {
- return ctrl_send(uctrl, UDEV_CTRL_SET_ENV, 0, key, timeout);
-}
-
-int udev_ctrl_send_set_children_max(struct udev_ctrl *uctrl, int count, int timeout) {
- return ctrl_send(uctrl, UDEV_CTRL_SET_CHILDREN_MAX, count, NULL, timeout);
-}
-
-int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout) {
- return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout);
-}
-
-int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout) {
- return ctrl_send(uctrl, UDEV_CTRL_EXIT, 0, NULL, timeout);
-}
-
-struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn) {
- struct udev_ctrl_msg *uctrl_msg;
- ssize_t size;
- struct cmsghdr *cmsg;
- struct iovec iov;
- char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
- struct msghdr smsg = {
- .msg_iov = &iov,
- .msg_iovlen = 1,
- .msg_control = cred_msg,
- .msg_controllen = sizeof(cred_msg),
- };
- struct ucred *cred;
-
- uctrl_msg = new0(struct udev_ctrl_msg, 1);
- if (uctrl_msg == NULL)
- return NULL;
- uctrl_msg->refcount = 1;
- uctrl_msg->conn = conn;
- udev_ctrl_connection_ref(conn);
-
- /* wait for the incoming message */
- for (;;) {
- struct pollfd pfd[1];
- int r;
-
- pfd[0].fd = conn->sock;
- pfd[0].events = POLLIN;
-
- r = poll(pfd, 1, 10000);
- if (r < 0) {
- if (errno == EINTR)
- continue;
- goto err;
- } else if (r == 0) {
- log_error("timeout waiting for ctrl message");
- goto err;
- } else {
- if (!(pfd[0].revents & POLLIN)) {
- log_error_errno(errno, "ctrl connection error: %m");
- goto err;
- }
- }
-
- break;
- }
-
- iov.iov_base = &uctrl_msg->ctrl_msg_wire;
- iov.iov_len = sizeof(struct udev_ctrl_msg_wire);
-
- size = recvmsg(conn->sock, &smsg, 0);
- if (size < 0) {
- log_error_errno(errno, "unable to receive ctrl message: %m");
- goto err;
- }
-
- cmsg_close_all(&smsg);
-
- cmsg = CMSG_FIRSTHDR(&smsg);
- cred = (struct ucred *) CMSG_DATA(cmsg);
-
- if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
- log_error("no sender credentials received, message ignored");
- goto err;
- }
-
- if (cred->uid != 0) {
- log_error("sender uid="UID_FMT", message ignored", cred->uid);
- goto err;
- }
-
- if (uctrl_msg->ctrl_msg_wire.magic != UDEV_CTRL_MAGIC) {
- log_error("message magic 0x%08x doesn't match, ignore it", uctrl_msg->ctrl_msg_wire.magic);
- goto err;
- }
-
- return uctrl_msg;
-err:
- udev_ctrl_msg_unref(uctrl_msg);
- return NULL;
-}
-
-struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg) {
- if (ctrl_msg == NULL)
- return NULL;
- ctrl_msg->refcount--;
- if (ctrl_msg->refcount > 0)
- return ctrl_msg;
- udev_ctrl_connection_unref(ctrl_msg->conn);
- free(ctrl_msg);
- return NULL;
-}
-
-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(struct udev_ctrl_msg *ctrl_msg) {
- if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD)
- 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_children_max(struct udev_ctrl_msg *ctrl_msg) {
- if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_SET_CHILDREN_MAX)
- return ctrl_msg->ctrl_msg_wire.intval;
- return -1;
-}
-
-int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg) {
- if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING)
- return 1;
- return -1;
-}
-
-int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg) {
- if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_EXIT)
- return 1;
- return -1;
-}
~ianmdlvl / elogind.git / blobdiff