1 3baa2617 2022-02-16 op /* $OpenBSD: control.c,v 1.8 2021/03/02 04:10:07 jsg Exp $ */
4 3baa2617 2022-02-16 op * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
6 3baa2617 2022-02-16 op * Permission to use, copy, modify, and distribute this software for any
7 3baa2617 2022-02-16 op * purpose with or without fee is hereby granted, provided that the above
8 3baa2617 2022-02-16 op * copyright notice and this permission notice appear in all copies.
10 3baa2617 2022-02-16 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 3baa2617 2022-02-16 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 3baa2617 2022-02-16 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 3baa2617 2022-02-16 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 3baa2617 2022-02-16 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 3baa2617 2022-02-16 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 3baa2617 2022-02-16 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 3baa2617 2022-02-16 op #include <sys/types.h>
19 3baa2617 2022-02-16 op #include <sys/queue.h>
20 3baa2617 2022-02-16 op #include <sys/stat.h>
21 3baa2617 2022-02-16 op #include <sys/socket.h>
22 3baa2617 2022-02-16 op #include <sys/uio.h>
23 3baa2617 2022-02-16 op #include <sys/un.h>
25 3baa2617 2022-02-16 op #include <netinet/in.h>
26 3baa2617 2022-02-16 op #include <net/if.h>
28 3baa2617 2022-02-16 op #include <errno.h>
29 3baa2617 2022-02-16 op #include <event.h>
30 3baa2617 2022-02-16 op #include <imsg.h>
31 bb3f279f 2022-02-16 op #include <limits.h>
32 14be015f 2022-02-17 op #include <stdio.h>
33 3baa2617 2022-02-16 op #include <stdlib.h>
34 3baa2617 2022-02-16 op #include <string.h>
35 3baa2617 2022-02-16 op #include <unistd.h>
37 3baa2617 2022-02-16 op #include "amused.h"
38 3baa2617 2022-02-16 op #include "log.h"
39 3baa2617 2022-02-16 op #include "control.h"
40 3baa2617 2022-02-16 op #include "playlist.h"
42 3baa2617 2022-02-16 op #define CONTROL_BACKLOG 5
45 3baa2617 2022-02-16 op struct event ev;
46 3baa2617 2022-02-16 op struct event evt;
48 19d6b480 2022-02-17 op struct playlist play;
50 19d6b480 2022-02-17 op } control_state = {.fd = -1, .tx = -1};
52 3baa2617 2022-02-16 op struct ctl_conn {
53 3baa2617 2022-02-16 op TAILQ_ENTRY(ctl_conn) entry;
54 3baa2617 2022-02-16 op struct imsgev iev;
57 3baa2617 2022-02-16 op TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
59 3baa2617 2022-02-16 op struct ctl_conn *control_connbyfd(int);
60 3baa2617 2022-02-16 op struct ctl_conn *control_connbypid(pid_t);
61 3baa2617 2022-02-16 op void control_close(int);
64 3baa2617 2022-02-16 op control_init(char *path)
66 3baa2617 2022-02-16 op struct sockaddr_un sun;
68 3baa2617 2022-02-16 op mode_t old_umask;
70 3baa2617 2022-02-16 op if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
72 3baa2617 2022-02-16 op log_warn("%s: socket", __func__);
76 3baa2617 2022-02-16 op memset(&sun, 0, sizeof(sun));
77 3baa2617 2022-02-16 op sun.sun_family = AF_UNIX;
78 3baa2617 2022-02-16 op strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
80 3baa2617 2022-02-16 op if (unlink(path) == -1)
81 3baa2617 2022-02-16 op if (errno != ENOENT) {
82 3baa2617 2022-02-16 op log_warn("%s: unlink %s", __func__, path);
87 3baa2617 2022-02-16 op old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
88 3baa2617 2022-02-16 op if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
89 3baa2617 2022-02-16 op log_warn("%s: bind: %s", __func__, path);
91 3baa2617 2022-02-16 op umask(old_umask);
94 3baa2617 2022-02-16 op umask(old_umask);
96 3baa2617 2022-02-16 op if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
97 3baa2617 2022-02-16 op log_warn("%s: chmod", __func__);
99 3baa2617 2022-02-16 op (void)unlink(path);
107 3baa2617 2022-02-16 op control_listen(int fd)
109 3baa2617 2022-02-16 op if (control_state.fd != -1)
110 3baa2617 2022-02-16 op fatalx("%s: received unexpected controlsock", __func__);
112 3baa2617 2022-02-16 op control_state.fd = fd;
113 3baa2617 2022-02-16 op if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
114 3baa2617 2022-02-16 op log_warn("%s: listen", __func__);
118 3baa2617 2022-02-16 op event_set(&control_state.ev, control_state.fd, EV_READ,
119 3baa2617 2022-02-16 op control_accept, NULL);
120 3baa2617 2022-02-16 op event_add(&control_state.ev, NULL);
121 3baa2617 2022-02-16 op evtimer_set(&control_state.evt, control_accept, NULL);
127 3baa2617 2022-02-16 op control_accept(int listenfd, short event, void *bula)
130 3baa2617 2022-02-16 op socklen_t len;
131 3baa2617 2022-02-16 op struct sockaddr_un sun;
132 3baa2617 2022-02-16 op struct ctl_conn *c;
134 3baa2617 2022-02-16 op event_add(&control_state.ev, NULL);
135 3baa2617 2022-02-16 op if ((event & EV_TIMEOUT))
138 3baa2617 2022-02-16 op len = sizeof(sun);
139 3baa2617 2022-02-16 op if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
140 3baa2617 2022-02-16 op SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
142 3baa2617 2022-02-16 op * Pause accept if we are out of file descriptors, or
143 3baa2617 2022-02-16 op * libevent will haunt us here too.
145 3baa2617 2022-02-16 op if (errno == ENFILE || errno == EMFILE) {
146 3baa2617 2022-02-16 op struct timeval evtpause = { 1, 0 };
148 3baa2617 2022-02-16 op event_del(&control_state.ev);
149 3baa2617 2022-02-16 op evtimer_add(&control_state.evt, &evtpause);
150 3baa2617 2022-02-16 op } else if (errno != EWOULDBLOCK && errno != EINTR &&
151 3baa2617 2022-02-16 op errno != ECONNABORTED)
152 3baa2617 2022-02-16 op log_warn("%s: accept4", __func__);
156 3baa2617 2022-02-16 op if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
157 3baa2617 2022-02-16 op log_warn("%s: calloc", __func__);
158 3baa2617 2022-02-16 op close(connfd);
162 3baa2617 2022-02-16 op imsg_init(&c->iev.ibuf, connfd);
163 3baa2617 2022-02-16 op c->iev.handler = control_dispatch_imsg;
164 3baa2617 2022-02-16 op c->iev.events = EV_READ;
165 3baa2617 2022-02-16 op event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
166 3baa2617 2022-02-16 op c->iev.handler, &c->iev);
167 3baa2617 2022-02-16 op event_add(&c->iev.ev, NULL);
169 3baa2617 2022-02-16 op TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
172 3baa2617 2022-02-16 op struct ctl_conn *
173 3baa2617 2022-02-16 op control_connbyfd(int fd)
175 3baa2617 2022-02-16 op struct ctl_conn *c;
177 3baa2617 2022-02-16 op TAILQ_FOREACH(c, &ctl_conns, entry) {
178 3baa2617 2022-02-16 op if (c->iev.ibuf.fd == fd)
185 3baa2617 2022-02-16 op struct ctl_conn *
186 3baa2617 2022-02-16 op control_connbypid(pid_t pid)
188 3baa2617 2022-02-16 op struct ctl_conn *c;
190 3baa2617 2022-02-16 op TAILQ_FOREACH(c, &ctl_conns, entry) {
191 3baa2617 2022-02-16 op if (c->iev.ibuf.pid == pid)
199 3baa2617 2022-02-16 op control_close(int fd)
201 3baa2617 2022-02-16 op struct ctl_conn *c;
203 3baa2617 2022-02-16 op if ((c = control_connbyfd(fd)) == NULL) {
204 3baa2617 2022-02-16 op log_warnx("%s: fd %d: not found", __func__, fd);
208 19d6b480 2022-02-17 op /* abort the transaction if running by this user */
209 19d6b480 2022-02-17 op if (c->iev.ibuf.pid == control_state.tx) {
210 19d6b480 2022-02-17 op playlist_free(&control_state.play);
211 19d6b480 2022-02-17 op control_state.tx = -1;
214 3baa2617 2022-02-16 op msgbuf_clear(&c->iev.ibuf.w);
215 3baa2617 2022-02-16 op TAILQ_REMOVE(&ctl_conns, c, entry);
217 3baa2617 2022-02-16 op event_del(&c->iev.ev);
218 3baa2617 2022-02-16 op close(c->iev.ibuf.fd);
220 3baa2617 2022-02-16 op /* Some file descriptors are available again. */
221 3baa2617 2022-02-16 op if (evtimer_pending(&control_state.evt, NULL)) {
222 3baa2617 2022-02-16 op evtimer_del(&control_state.evt);
223 3baa2617 2022-02-16 op event_add(&control_state.ev, NULL);
230 3baa2617 2022-02-16 op control_dispatch_imsg(int fd, short event, void *bula)
232 3baa2617 2022-02-16 op struct ctl_conn *c;
233 3baa2617 2022-02-16 op struct imsg imsg;
236 3baa2617 2022-02-16 op if ((c = control_connbyfd(fd)) == NULL) {
237 3baa2617 2022-02-16 op log_warnx("%s: fd %d: not found", __func__, fd);
241 3baa2617 2022-02-16 op if (event & EV_READ) {
242 3baa2617 2022-02-16 op if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
244 3baa2617 2022-02-16 op control_close(fd);
248 3baa2617 2022-02-16 op if (event & EV_WRITE) {
249 3baa2617 2022-02-16 op if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
250 3baa2617 2022-02-16 op control_close(fd);
256 3baa2617 2022-02-16 op if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
257 3baa2617 2022-02-16 op control_close(fd);
263 3baa2617 2022-02-16 op switch (imsg.hdr.type) {
264 3baa2617 2022-02-16 op case IMSG_CTL_PLAY:
265 3baa2617 2022-02-16 op switch (play_state) {
266 3baa2617 2022-02-16 op case STATE_STOPPED:
267 2f589330 2022-02-17 op main_playlist_resume();
269 3baa2617 2022-02-16 op case STATE_PLAYING:
270 3baa2617 2022-02-16 op /* do nothing */
272 3baa2617 2022-02-16 op case STATE_PAUSED:
273 950ad05c 2022-02-16 op play_state = STATE_PLAYING;
274 06961b72 2022-02-16 op main_send_player(IMSG_RESUME, -1, NULL, 0);
278 3baa2617 2022-02-16 op case IMSG_CTL_TOGGLE_PLAY:
279 3baa2617 2022-02-16 op switch (play_state) {
280 3baa2617 2022-02-16 op case STATE_STOPPED:
281 2f589330 2022-02-17 op main_playlist_resume();
283 3baa2617 2022-02-16 op case STATE_PLAYING:
284 2ac7eafd 2022-02-16 op play_state = STATE_PAUSED;
285 06961b72 2022-02-16 op main_send_player(IMSG_PAUSE, -1, NULL, 0);
287 3baa2617 2022-02-16 op case STATE_PAUSED:
288 2ac7eafd 2022-02-16 op play_state = STATE_PLAYING;
289 06961b72 2022-02-16 op main_send_player(IMSG_RESUME, -1, NULL, 0);
293 3baa2617 2022-02-16 op case IMSG_CTL_PAUSE:
294 3baa2617 2022-02-16 op if (play_state != STATE_PLAYING)
296 950ad05c 2022-02-16 op play_state = STATE_PAUSED;
297 06961b72 2022-02-16 op main_send_player(IMSG_PAUSE, -1, NULL, 0);
299 3baa2617 2022-02-16 op case IMSG_CTL_STOP:
300 3baa2617 2022-02-16 op if (play_state == STATE_STOPPED)
302 bfaa7897 2022-02-17 op play_state = STATE_STOPPED;
303 06961b72 2022-02-16 op main_send_player(IMSG_STOP, -1, NULL, 0);
305 3baa2617 2022-02-16 op case IMSG_CTL_RESTART:
306 06961b72 2022-02-16 op main_send_player(IMSG_STOP, -1, NULL, 0);
307 aaccc123 2022-02-16 op main_restart_track();
309 3baa2617 2022-02-16 op case IMSG_CTL_FLUSH:
310 3baa2617 2022-02-16 op playlist_truncate();
312 3baa2617 2022-02-16 op case IMSG_CTL_SHOW:
313 d980494c 2022-02-16 op main_send_playlist(&c->iev);
315 bb3f279f 2022-02-16 op case IMSG_CTL_STATUS:
316 bb3f279f 2022-02-16 op main_send_status(&c->iev);
318 af27e631 2022-02-17 op case IMSG_CTL_NEXT:
319 af27e631 2022-02-17 op main_send_player(IMSG_STOP, -1, NULL, 0);
320 af27e631 2022-02-17 op main_playlist_advance();
322 af27e631 2022-02-17 op case IMSG_CTL_PREV:
323 af27e631 2022-02-17 op main_send_player(IMSG_STOP, -1, NULL, 0);
324 af27e631 2022-02-17 op main_playlist_previous();
326 19d6b480 2022-02-17 op case IMSG_CTL_BEGIN:
327 19d6b480 2022-02-17 op if (control_state.tx != -1) {
328 19d6b480 2022-02-17 op main_senderr(&c->iev, "locked");
331 19d6b480 2022-02-17 op control_state.tx = c->iev.ibuf.pid;
332 19d6b480 2022-02-17 op imsg_compose_event(&c->iev, IMSG_CTL_BEGIN, 0, 0, -1,
335 19d6b480 2022-02-17 op case IMSG_CTL_ADD:
336 19d6b480 2022-02-17 op if (control_state.tx != -1 &&
337 19d6b480 2022-02-17 op control_state.tx != c->iev.ibuf.pid) {
338 19d6b480 2022-02-17 op main_senderr(&c->iev, "locked");
341 19d6b480 2022-02-17 op main_enqueue(control_state.tx != -1,
342 19d6b480 2022-02-17 op &control_state.play,&c->iev, &imsg);
344 19d6b480 2022-02-17 op case IMSG_CTL_COMMIT:
345 19d6b480 2022-02-17 op if (control_state.tx != c->iev.ibuf.pid) {
346 19d6b480 2022-02-17 op main_senderr(&c->iev, "locked");
349 19d6b480 2022-02-17 op playlist_swap(&control_state.play);
350 19d6b480 2022-02-17 op memset(&control_state.play, 0,
351 19d6b480 2022-02-17 op sizeof(control_state.play));
352 19d6b480 2022-02-17 op control_state.tx = -1;
353 19d6b480 2022-02-17 op imsg_compose_event(&c->iev, IMSG_CTL_COMMIT, 0, 0, -1,
357 3baa2617 2022-02-16 op log_debug("%s: error handling imsg %d", __func__,
358 3baa2617 2022-02-16 op imsg.hdr.type);
361 3baa2617 2022-02-16 op imsg_free(&imsg);
364 3baa2617 2022-02-16 op imsg_event_add(&c->iev);
368 3baa2617 2022-02-16 op control_imsg_relay(struct imsg *imsg)
370 3baa2617 2022-02-16 op struct ctl_conn *c;
372 3baa2617 2022-02-16 op if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
375 3baa2617 2022-02-16 op return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
376 3baa2617 2022-02-16 op -1, imsg->data, IMSG_DATA_SIZE(*imsg)));