145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/*
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* plymouth-ctrl.c Simply communications with plymouthd
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* to avoid forked sub processes and/or
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* missed plymouth send commands tool
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* due a plymouthd replacement.
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*
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* Copyright (c) 2016 SUSE Linux GmbH, All rights reserved.
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* Copyright (c) 2016 Werner Fink <werner@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* Author: Werner Fink <werner@suse.de>
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*/
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#include <errno.h>
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#include <limits.h>
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#include <poll.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include "all-io.h"
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#include "c.h"
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#include "nls.h"
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#include "plymouth-ctrl.h"
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static int can_read(int fd, const long timeout)
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{
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struct pollfd fds = {
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.fd = fd,
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.events = POLLIN|POLLPRI,
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.revents = 0,
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};
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int ret;
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do {
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ret = poll(&fds, 1, timeout);
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} while ((ret < 0) && (errno == EINTR));
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return (ret == 1) && (fds.revents & (POLLIN|POLLPRI));
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}
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static int open_un_socket_and_connect(void)
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{
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/* The abstract UNIX socket of plymouth */
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struct sockaddr_un su = {
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.sun_family = AF_UNIX,
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.sun_path = PLYMOUTH_SOCKET_PATH,
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};
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const int one = 1;
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int fd, ret;
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fd = socket(PF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (fd < 0) {
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warnx(_("cannot open UNIX socket"));
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goto err;
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}
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ret = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
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if (ret < 0) {
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warnx(_("cannot set option for UNIX socket"));
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close(fd);
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fd = -1;
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goto err;
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}
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/* Note, the abstract PLYMOUTH_SOCKET_PATH has a leading NULL byte */
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ret = connect(fd, (struct sockaddr *) &su,
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offsetof(struct sockaddr_un, sun_path) + 1 + strlen(su.sun_path+1));
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if (ret < 0) {
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if (errno != ECONNREFUSED)
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warnx(_("cannot connect on UNIX socket"));
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close(fd);
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fd = -1;
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goto err;
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}
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err:
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return fd;
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}
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int plymouth_command(int cmd, ...)
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{
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uint8_t answer[2], command[2];
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struct sigaction sp, op;
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int fdsock = -1, ret = 0;
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sigemptyset (&sp.sa_mask);
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sp.sa_handler = SIG_IGN;
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sp.sa_flags = SA_RESTART;
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sigaction(SIGPIPE, &sp, &op);
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/* The plymouthd does read at least two bytes. */
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command[1] = '\0';
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switch (cmd) {
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case MAGIC_PING:
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fdsock = open_un_socket_and_connect();
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if (fdsock >= 0) {
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command[0] = cmd;
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write_all(fdsock, command, sizeof(command));
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}
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break;
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case MAGIC_QUIT:
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fdsock = open_un_socket_and_connect();
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if (fdsock >= 0) {
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command[0] = cmd;
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write_all(fdsock, command, sizeof(command));
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}
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break;
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default:
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warnx(_("the plymouth request %c is not implemented"), cmd);
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case '?':
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goto err;
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}
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answer[0] = '\0';
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if (fdsock >= 0) {
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if (can_read(fdsock, 1000))
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read_all(fdsock, (char *) &answer[0], sizeof(answer));
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close(fdsock);
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}
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sigaction(SIGPIPE, &op, NULL);
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ret = (answer[0] == ANSWER_ACK) ? 1 : 0;
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err:
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return ret;
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}
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