1 /* $OpenBSD: control.c,v 1.8 2021/03/02 04:10:07 jsg Exp $ */
4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 #include <sys/types.h>
19 #include <sys/queue.h>
21 #include <sys/socket.h>
25 #include <netinet/in.h>
42 #define CONTROL_BACKLOG 5
50 } control_state = {.fd = -1, .tx = -1};
53 TAILQ_ENTRY(ctl_conn) entry;
57 TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
59 struct ctl_conn *control_connbyfd(int);
60 struct ctl_conn *control_connbypid(pid_t);
61 void control_close(int);
64 control_init(char *path)
66 struct sockaddr_un sun;
70 if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
72 log_warn("%s: socket", __func__);
76 memset(&sun, 0, sizeof(sun));
77 sun.sun_family = AF_UNIX;
78 strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
80 if (unlink(path) == -1)
81 if (errno != ENOENT) {
82 log_warn("%s: unlink %s", __func__, path);
87 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
88 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
89 log_warn("%s: bind: %s", __func__, path);
96 if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
97 log_warn("%s: chmod", __func__);
107 control_listen(int fd)
109 if (control_state.fd != -1)
110 fatalx("%s: received unexpected controlsock", __func__);
112 control_state.fd = fd;
113 if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
114 log_warn("%s: listen", __func__);
118 event_set(&control_state.ev, control_state.fd, EV_READ,
119 control_accept, NULL);
120 event_add(&control_state.ev, NULL);
121 evtimer_set(&control_state.evt, control_accept, NULL);
127 control_accept(int listenfd, short event, void *bula)
131 struct sockaddr_un sun;
134 event_add(&control_state.ev, NULL);
135 if ((event & EV_TIMEOUT))
139 if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
140 SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
142 * Pause accept if we are out of file descriptors, or
143 * libevent will haunt us here too.
145 if (errno == ENFILE || errno == EMFILE) {
146 struct timeval evtpause = { 1, 0 };
148 event_del(&control_state.ev);
149 evtimer_add(&control_state.evt, &evtpause);
150 } else if (errno != EWOULDBLOCK && errno != EINTR &&
151 errno != ECONNABORTED)
152 log_warn("%s: accept4", __func__);
156 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
157 log_warn("%s: calloc", __func__);
162 imsg_init(&c->iev.ibuf, connfd);
163 c->iev.handler = control_dispatch_imsg;
164 c->iev.events = EV_READ;
165 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
166 c->iev.handler, &c->iev);
167 event_add(&c->iev.ev, NULL);
169 TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
173 control_connbyfd(int fd)
177 TAILQ_FOREACH(c, &ctl_conns, entry) {
178 if (c->iev.ibuf.fd == fd)
186 control_connbypid(pid_t pid)
190 TAILQ_FOREACH(c, &ctl_conns, entry) {
191 if (c->iev.ibuf.pid == pid)
199 control_close(int fd)
203 if ((c = control_connbyfd(fd)) == NULL) {
204 log_warnx("%s: fd %d: not found", __func__, fd);
208 /* abort the transaction if running by this user */
209 if (c->iev.ibuf.pid == control_state.tx) {
210 playlist_free(&control_state.play);
211 control_state.tx = -1;
214 msgbuf_clear(&c->iev.ibuf.w);
215 TAILQ_REMOVE(&ctl_conns, c, entry);
217 event_del(&c->iev.ev);
218 close(c->iev.ibuf.fd);
220 /* Some file descriptors are available again. */
221 if (evtimer_pending(&control_state.evt, NULL)) {
222 evtimer_del(&control_state.evt);
223 event_add(&control_state.ev, NULL);
230 control_dispatch_imsg(int fd, short event, void *bula)
236 if ((c = control_connbyfd(fd)) == NULL) {
237 log_warnx("%s: fd %d: not found", __func__, fd);
241 if (event & EV_READ) {
242 if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
248 if (event & EV_WRITE) {
249 if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
256 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
263 switch (imsg.hdr.type) {
265 switch (play_state) {
267 main_playlist_resume();
273 play_state = STATE_PLAYING;
274 main_send_player(IMSG_RESUME, -1, NULL, 0);
278 case IMSG_CTL_TOGGLE_PLAY:
279 switch (play_state) {
281 main_playlist_resume();
284 play_state = STATE_PAUSED;
285 main_send_player(IMSG_PAUSE, -1, NULL, 0);
288 play_state = STATE_PLAYING;
289 main_send_player(IMSG_RESUME, -1, NULL, 0);
294 if (play_state != STATE_PLAYING)
296 play_state = STATE_PAUSED;
297 main_send_player(IMSG_PAUSE, -1, NULL, 0);
300 if (play_state == STATE_STOPPED)
302 play_state = STATE_STOPPED;
303 main_send_player(IMSG_STOP, -1, NULL, 0);
305 case IMSG_CTL_RESTART:
306 main_send_player(IMSG_STOP, -1, NULL, 0);
307 main_restart_track();
313 main_send_playlist(&c->iev);
315 case IMSG_CTL_STATUS:
316 main_send_status(&c->iev);
319 main_send_player(IMSG_STOP, -1, NULL, 0);
320 main_playlist_advance();
323 main_send_player(IMSG_STOP, -1, NULL, 0);
324 main_playlist_previous();
327 if (control_state.tx != -1) {
328 main_senderr(&c->iev, "locked");
331 control_state.tx = c->iev.ibuf.pid;
332 imsg_compose_event(&c->iev, IMSG_CTL_BEGIN, 0, 0, -1,
336 if (control_state.tx != -1 &&
337 control_state.tx != c->iev.ibuf.pid) {
338 main_senderr(&c->iev, "locked");
341 main_enqueue(control_state.tx != -1,
342 &control_state.play,&c->iev, &imsg);
344 case IMSG_CTL_COMMIT:
345 if (control_state.tx != c->iev.ibuf.pid) {
346 main_senderr(&c->iev, "locked");
349 playlist_swap(&control_state.play);
350 memset(&control_state.play, 0,
351 sizeof(control_state.play));
352 control_state.tx = -1;
353 imsg_compose_event(&c->iev, IMSG_CTL_COMMIT, 0, 0, -1,
357 log_debug("%s: error handling imsg %d", __func__,
364 imsg_event_add(&c->iev);
368 control_imsg_relay(struct imsg *imsg)
372 if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
375 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
376 -1, imsg->data, IMSG_DATA_SIZE(*imsg)));