/*

* Copyright (c) 2022 Omar Polo <op@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/socket.h>

#include <sys/uio.h>

#include <sys/wait.h>

#include <event.h>

#include <errno.h>

#include <fcntl.h>

#include <limits.h>

#include <sndio.h>

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <stdint.h>

#include <string.h>

#include <syslog.h>

#include <unistd.h>

#include <imsg.h>

#include "amused.h"

#include "control.h"

#include "log.h"

#include "playlist.h"

#include "xmalloc.h"

struct sio_hdl *hdl;

char *csock = NULL;

int debug;

int verbose;

struct imsgev *iev_player;

const char *argv0;

pid_t player_pid;

struct event ev_sigint;

struct event ev_sigterm;

struct event ev_siginfo;

enum amused_process {

PROC_MAIN,

PROC_PLAYER,

};

__dead void

main_shutdown(void)

{

pid_t pid;

int status;

/* close pipes. */

msgbuf_clear(&iev_player->ibuf.w);

close(iev_player->ibuf.fd);

free(iev_player);

log_debug("waiting for children to terminate");

do {

pid = wait(&status);

if (pid == -1) {

if (errno != EINTR && errno != ECHILD)

fatal("wait");

} else if (WIFSIGNALED(status))

log_warnx("player terminated; signal %d",

WTERMSIG(status));

} while (pid != -1 || (pid == -1 && errno == EINTR));

log_info("terminating");

exit(0);

}

static void

main_status(void)

{

const char *cur;

switch (play_state) {

case STATE_STOPPED:

log_info("status: stopped");

break;

case STATE_PLAYING:

log_info("status: playing");

break;

case STATE_PAUSED:

log_info("status: paused");

break;

default:

log_info("status: unknown");

break;

}

if ((cur = playlist_current()) != NULL)

log_info("playing %s", cur);

else

log_info("not playing anything");

}

static void

main_sig_handler(int sig, short event, void *arg)

{

/*

* Normal signal handler rules don't apply because libevent

* decouples for us.

*/

switch (sig) {

case SIGTERM:

case SIGINT:

main_shutdown();

break;

case SIGINFO:

main_status();

break;

default:

fatalx("unexpected signal %d", sig);

}

}

static void

main_dispatch_player(int sig, short event, void *d)

{

struct imsgev *iev = d;

struct imsgbuf *ibuf = &iev->ibuf;

struct imsg imsg;

ssize_t n;

int shut = 0;

if (event & EV_READ) {

if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)

fatal("imsg_read error");

if (n == 0) /* Connection closed */

shut = 1;

}

if (event & EV_WRITE) {

if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)

fatal("msgbuf_write");

if (n == 0) /* Connection closed */

shut = 1;

}

for (;;) {

if ((n = imsg_get(ibuf, &imsg)) == -1)

fatal("imsg_get");

if (n == 0) /* No more messages. */

break;

switch (imsg.hdr.type) {

case IMSG_ERR:

playlist_dropcurrent();

/* fallthrough */

case IMSG_EOF:

main_playlist_advance();

break;

default:

log_debug("%s: error handling imsg %d", __func__,

imsg.hdr.type);

break;

}

imsg_free(&imsg);

}

if (!shut)

imsg_event_add(iev);

else {

/* This pipe is dead. Remove its event handler. */

event_del(&iev->ev);

event_loopexit(NULL);

}

}

static pid_t

start_child(enum amused_process proc, int fd)

{

const char *argv[6];

int argc = 0;

pid_t pid;

switch (pid = fork()) {

case -1:

fatal("cannot fork");

case 0:

break;

default:

close(fd);

return pid;

}

if (fd != 3) {

if (fd != -1 && dup2(fd, 3) == -1)

fatal("cannot setup imsg fd");

} else if (fcntl(F_SETFD, 0) == -1)

fatal("cannot setup imsg fd");

argv[argc++] = argv0;

switch (proc) {

case PROC_MAIN:

argv[argc++] = "-s";

argv[argc++] = csock;

break;

case PROC_PLAYER:

argv[argc++] = "-Tp";

break;

}

if (debug)

argv[argc++] = "-d";

if (verbose)

argv[argc++] = "-v";

argv[argc++] = NULL;

/* obnoxious casts */

execvp(argv0, (char *const *)argv);

fatal("execvp %s", argv0);

}

/* daemon main routine */

static __dead int

amused_main(void)

{

int pipe_main2player[2];

int control_fd;

log_init(debug, LOG_DAEMON);

log_setverbose(verbose);

log_procinit("main");

if (!debug)

daemon(1, 0);

if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,

PF_UNSPEC, pipe_main2player) == -1)

fatal("socketpair");

player_pid = start_child(PROC_PLAYER, pipe_main2player[1]);

event_init();

signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);

signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);

signal_set(&ev_siginfo, SIGINFO, main_sig_handler, NULL);

signal_add(&ev_sigint, NULL);

signal_add(&ev_sigterm, NULL);

signal_add(&ev_siginfo, NULL);

signal(SIGHUP, SIG_IGN);

signal(SIGCHLD, SIG_IGN);

signal(SIGPIPE, SIG_IGN);

iev_player = xmalloc(sizeof(*iev_player));

imsg_init(&iev_player->ibuf, pipe_main2player[0]);

iev_player->handler = main_dispatch_player;

iev_player->events = EV_READ;

event_set(&iev_player->ev, iev_player->ibuf.fd, iev_player->events,

iev_player->handler, iev_player);

event_add(&iev_player->ev, NULL);

if ((control_fd = control_init(csock)) == -1)

fatal("control socket setup failed %s", csock);

control_listen(control_fd);

if (pledge("stdio rpath unix sendfd", NULL) == -1)

fatal("pledge");

log_info("startup");

event_dispatch();

main_shutdown();

}

int

main(int argc, char **argv)

{

int ch, proc = PROC_MAIN;

log_init(1, LOG_DAEMON); /* Log to stderr until daemonized */

log_setverbose(1);

argv0 = argv[0];

if (argv0 == NULL)

argv0 = "amused";

while ((ch = getopt(argc, argv, "ds:T:vV")) != -1) {

switch (ch) {

case 'd':

debug = 1;

break;

case 's':

free(csock);

csock = xstrdup(optarg);

break;

case 'T':

switch (*optarg) {

case 'p':

proc = PROC_PLAYER;

break;

default:

usage();

}

break;

case 'v':

verbose++;

break;

case 'V':

printf("%s version %s\n", getprogname(),

AMUSED_VERSION);

exit(0);

default:

usage();

}

}

argv += optind;

argc -= optind;

if (proc == PROC_PLAYER)

exit(player(debug, verbose));

if (csock == NULL)

xasprintf(&csock, "/tmp/amused-%d", getuid());

if (argc == 0)

amused_main();

else

ctl(argc, argv);

return 0;

}

void

spawn_daemon(void)

{

debug = 0;

start_child(PROC_MAIN, -1);

}

void

imsg_event_add(struct imsgev *iev)

{

iev->events = EV_READ;

if (iev->ibuf.w.queued)

iev->events |= EV_WRITE;

event_del(&iev->ev);

event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);

event_add(&iev->ev, NULL);

}

int

imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,

pid_t pid, int fd, const void *data, uint16_t datalen)

{

int ret;

if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,

datalen)) != -1)

imsg_event_add(iev);

return ret;

}

int

main_send_player(uint16_t type, int fd, const void *data, uint16_t datalen)

{

return imsg_compose_event(iev_player, type, 0, 0, fd, data, datalen);

}

int

main_play_song(const char *song)

{

char path[PATH_MAX] = { 0 };

int fd;

strlcpy(path, song, sizeof(path));

if ((fd = open(path, O_RDONLY)) == -1) {

log_warn("open %s", path);

return 0;

}

play_state = STATE_PLAYING;

imsg_compose_event(iev_player, IMSG_PLAY, 0, 0, fd,

path, sizeof(path));

return 1;

}

void

main_playlist_jump(struct imsgev *iev, struct imsg *imsg)

{

size_t datalen;

char arg[PATH_MAX];

const char *song;

datalen = IMSG_DATA_SIZE(*imsg);

if (datalen != sizeof(arg)) {

main_senderr(iev, "wrong size");

return;

}

memcpy(arg, imsg->data, sizeof(arg));

if (arg[sizeof(arg)-1] != '\0') {

main_senderr(iev, "data corrupted");

return;

}

song = playlist_jump(arg);

if (song == NULL) {

main_senderr(iev, "not found");

return;

}

main_send_player(IMSG_STOP, -1, NULL, 0);

if (!main_play_song(song)) {

main_senderr(iev, "can't play");

playlist_dropcurrent();

main_playlist_advance();

return;

}

main_send_status(iev);

}

void

main_playlist_resume(void)

{

const char *song;

if ((song = playlist_current()) == NULL)

song = playlist_advance();

for (; song != NULL; song = playlist_advance()) {

if (main_play_song(song))

return;

playlist_dropcurrent();

}

}

void

main_playlist_advance(void)

{

const char *song;

for (;;) {

song = playlist_advance();

if (song == NULL)

return;

if (main_play_song(song))

break;

playlist_dropcurrent();

}

}

void

main_playlist_previous(void)

{

const char *song;

for (;;) {

song = playlist_previous();

if (song == NULL)

return;

if (main_play_song(song))

break;

playlist_dropcurrent();

}

}

void

main_restart_track(void)

{

const char *song;

song = playlist_current();

if (song == NULL)

return;

if (main_play_song(song))

return;

playlist_dropcurrent();

main_playlist_advance();

}

void

main_senderr(struct imsgev *iev, const char *msg)

{

imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1,

msg, strlen(msg)+1);

}

void

main_enqueue(int tx, struct playlist *px, struct imsgev *iev,

struct imsg *imsg)

{

size_t datalen;

char path[PATH_MAX] = { 0 };

const char *err = NULL;

datalen = IMSG_DATA_SIZE(*imsg);

if (datalen != sizeof(path)) {

err = "data size mismatch";

goto err;

}

memcpy(path, imsg->data, sizeof(path));

if (path[datalen-1] != '\0') {

err = "malformed data";

goto err;

}

if (tx)

playlist_push(px, path);

else

playlist_enqueue(path);

imsg_compose_event(iev, IMSG_CTL_ADD, 0, 0, -1, path, sizeof(path));

return;

err:

imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1, err, strlen(err)+1);

}

void

main_send_playlist(struct imsgev *iev)

{

struct player_status s;

size_t i;

for (i = 0; i < playlist.len; ++i) {

memset(&s, 0, sizeof(s));

strlcpy(s.path, playlist.songs[i], sizeof(s.path));

s.status = play_off == i ? STATE_PLAYING : STATE_STOPPED;

imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, &s,

sizeof(s));

}

imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);

}

void

main_send_status(struct imsgev *iev)

{

struct player_status s;

const char *song;

memset(&s, 0, sizeof(s));

song = playlist_current();

if (song != NULL)

strlcpy(s.path, song, sizeof(s.path));

s.status = play_state;

imsg_compose_event(iev, IMSG_CTL_STATUS, 0, 0, -1, &s, sizeof(s));

}