Blob
Date:
Tue May 10 15:04:48 2022 UTC
Message:
simplify main_send_player: data is always NULL
/* $OpenBSD: control.c,v 1.8 2021/03/02 04:10:07 jsg Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <net/if.h>
#include <errno.h>
#include <event.h>
#include <imsg.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "amused.h"
#include "log.h"
#include "control.h"
#include "playlist.h"
#define CONTROL_BACKLOG 5
struct {
struct event ev;
struct event evt;
int fd;
struct playlist play;
int tx;
} control_state = {.fd = -1, .tx = -1};
struct ctl_conn {
TAILQ_ENTRY(ctl_conn) entry;
int monitor; /* 1 if client is in monitor mode */
struct imsgev iev;
};
TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
struct ctl_conn *control_connbyfd(int);
struct ctl_conn *control_connbypid(pid_t);
void control_close(int);
int
control_init(char *path)
{
struct sockaddr_un sun;
int fd;
mode_t old_umask;
if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
0)) == -1) {
log_warn("%s: socket", __func__);
return (-1);
}
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
if (unlink(path) == -1)
if (errno != ENOENT) {
log_warn("%s: unlink %s", __func__, path);
close(fd);
return (-1);
}
old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
log_warn("%s: bind: %s", __func__, path);
close(fd);
umask(old_umask);
return (-1);
}
umask(old_umask);
if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
log_warn("%s: chmod", __func__);
close(fd);
(void)unlink(path);
return (-1);
}
return (fd);
}
int
control_listen(int fd)
{
if (control_state.fd != -1)
fatalx("%s: received unexpected controlsock", __func__);
control_state.fd = fd;
if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
log_warn("%s: listen", __func__);
return (-1);
}
event_set(&control_state.ev, control_state.fd, EV_READ,
control_accept, NULL);
event_add(&control_state.ev, NULL);
evtimer_set(&control_state.evt, control_accept, NULL);
return (0);
}
void
control_accept(int listenfd, short event, void *bula)
{
int connfd;
socklen_t len;
struct sockaddr_un sun;
struct ctl_conn *c;
event_add(&control_state.ev, NULL);
if ((event & EV_TIMEOUT))
return;
len = sizeof(sun);
if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
/*
* Pause accept if we are out of file descriptors, or
* libevent will haunt us here too.
*/
if (errno == ENFILE || errno == EMFILE) {
struct timeval evtpause = { 1, 0 };
event_del(&control_state.ev);
evtimer_add(&control_state.evt, &evtpause);
} else if (errno != EWOULDBLOCK && errno != EINTR &&
errno != ECONNABORTED)
log_warn("%s: accept4", __func__);
return;
}
if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
log_warn("%s: calloc", __func__);
close(connfd);
return;
}
imsg_init(&c->iev.ibuf, connfd);
c->iev.handler = control_dispatch_imsg;
c->iev.events = EV_READ;
event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
c->iev.handler, &c->iev);
event_add(&c->iev.ev, NULL);
TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
}
struct ctl_conn *
control_connbyfd(int fd)
{
struct ctl_conn *c;
TAILQ_FOREACH(c, &ctl_conns, entry) {
if (c->iev.ibuf.fd == fd)
break;
}
return (c);
}
struct ctl_conn *
control_connbypid(pid_t pid)
{
struct ctl_conn *c;
TAILQ_FOREACH(c, &ctl_conns, entry) {
if (c->iev.ibuf.pid == pid)
break;
}
return (c);
}
void
control_close(int fd)
{
struct ctl_conn *c;
if ((c = control_connbyfd(fd)) == NULL) {
log_warnx("%s: fd %d: not found", __func__, fd);
return;
}
/* abort the transaction if running by this user */
if (control_state.tx != -1 && c->iev.ibuf.fd == control_state.tx) {
playlist_free(&control_state.play);
control_state.tx = -1;
}
msgbuf_clear(&c->iev.ibuf.w);
TAILQ_REMOVE(&ctl_conns, c, entry);
event_del(&c->iev.ev);
close(c->iev.ibuf.fd);
/* Some file descriptors are available again. */
if (evtimer_pending(&control_state.evt, NULL)) {
evtimer_del(&control_state.evt);
event_add(&control_state.ev, NULL);
}
free(c);
}
void
control_notify(struct imsgev *iev, int type)
{
struct ctl_conn *c;
TAILQ_FOREACH(c, &ctl_conns, entry) {
if (&c->iev == iev || !c->monitor)
continue;
imsg_compose_event(&c->iev, IMSG_CTL_MONITOR, 0, 0,
-1, &type, sizeof(type));
}
}
void
control_dispatch_imsg(int fd, short event, void *bula)
{
struct ctl_conn *c;
struct imsg imsg;
struct player_repeat rp;
ssize_t n, off;
if ((c = control_connbyfd(fd)) == NULL) {
log_warnx("%s: fd %d: not found", __func__, fd);
return;
}
if (event & EV_READ) {
if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
n == 0) {
control_close(fd);
return;
}
}
if (event & EV_WRITE) {
if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
control_close(fd);
return;
}
}
for (;;) {
if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
control_close(fd);
return;
}
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_CTL_PLAY:
switch (play_state) {
case STATE_STOPPED:
main_playlist_resume();
break;
case STATE_PLAYING:
/* do nothing */
break;
case STATE_PAUSED:
play_state = STATE_PLAYING;
main_send_player(IMSG_RESUME, -1);
break;
}
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_TOGGLE_PLAY:
switch (play_state) {
case STATE_STOPPED:
main_playlist_resume();
break;
case STATE_PLAYING:
play_state = STATE_PAUSED;
main_send_player(IMSG_PAUSE, -1);
break;
case STATE_PAUSED:
play_state = STATE_PLAYING;
main_send_player(IMSG_RESUME, -1);
break;
}
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_PAUSE:
if (play_state != STATE_PLAYING)
break;
play_state = STATE_PAUSED;
main_send_player(IMSG_PAUSE, -1);
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_STOP:
if (play_state == STATE_STOPPED)
break;
play_state = STATE_STOPPED;
main_send_player(IMSG_STOP, -1);
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_RESTART:
main_send_player(IMSG_STOP, -1);
main_restart_track();
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_FLUSH:
playlist_truncate();
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_SHOW:
main_send_playlist(&c->iev);
break;
case IMSG_CTL_STATUS:
main_send_status(&c->iev);
break;
case IMSG_CTL_NEXT:
main_send_player(IMSG_STOP, -1);
main_playlist_advance();
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_PREV:
main_send_player(IMSG_STOP, -1);
main_playlist_previous();
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_JUMP:
main_playlist_jump(&c->iev, &imsg);
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_REPEAT:
if (IMSG_DATA_SIZE(imsg) != sizeof(rp)) {
log_warnx("%s: got wrong size", __func__);
break;
}
memcpy(&rp, imsg.data, sizeof(rp));
if (rp.repeat_all != -1)
repeat_all = rp.repeat_all;
if (rp.repeat_one != -1)
repeat_one = rp.repeat_one;
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_BEGIN:
if (control_state.tx != -1) {
main_senderr(&c->iev, "locked");
break;
}
control_state.tx = c->iev.ibuf.fd;
imsg_compose_event(&c->iev, IMSG_CTL_BEGIN, 0, 0, -1,
NULL, 0);
break;
case IMSG_CTL_ADD:
if (control_state.tx != -1 &&
control_state.tx != c->iev.ibuf.fd) {
main_senderr(&c->iev, "locked");
break;
}
main_enqueue(control_state.tx != -1,
&control_state.play,&c->iev, &imsg);
if (control_state.tx == -1)
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_COMMIT:
if (control_state.tx != c->iev.ibuf.fd) {
main_senderr(&c->iev, "locked");
break;
}
if (IMSG_DATA_SIZE(imsg) != sizeof(off)) {
main_senderr(&c->iev, "wrong size");
break;
}
memcpy(&off, imsg.data, sizeof(off));
playlist_swap(&control_state.play, off);
memset(&control_state.play, 0,
sizeof(control_state.play));
control_state.tx = -1;
imsg_compose_event(&c->iev, IMSG_CTL_COMMIT, 0, 0, -1,
NULL, 0);
control_notify(&c->iev, imsg.hdr.type);
break;
case IMSG_CTL_MONITOR:
c->monitor = 1;
break;
default:
log_debug("%s: error handling imsg %d", __func__,
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
imsg_event_add(&c->iev);
}
int
control_imsg_relay(struct imsg *imsg)
{
struct ctl_conn *c;
if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
return (0);
return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
-1, imsg->data, IMSG_DATA_SIZE(*imsg)));
}
Omar Polo