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mpv/input/ipc.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <pthread.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include "config.h"
#include "osdep/io.h"
#include "osdep/threads.h"
#include "common/common.h"
#include "common/global.h"
#include "common/msg.h"
#include "input/input.h"
#include "libmpv/client.h"
#include "misc/bstr.h"
#include "misc/json.h"
#include "options/m_option.h"
#include "options/options.h"
#include "options/path.h"
#include "player/client.h"
struct mp_ipc_ctx {
struct mp_log *log;
struct mp_client_api *client_api;
const char *path;
pthread_t thread;
int death_pipe[2];
};
struct client_arg {
struct mp_log *log;
struct mpv_handle *client;
char *client_name;
int client_fd;
bool close_client_fd;
bool writable;
int suspend_counter;
};
static mpv_node *mpv_node_map_get(mpv_node *src, const char *key)
{
if (src->format != MPV_FORMAT_NODE_MAP)
return NULL;
for (int i = 0; i < src->u.list->num; i++)
if (!strcmp(key, src->u.list->keys[i]))
return &src->u.list->values[i];
return NULL;
}
static mpv_node *mpv_node_array_get(mpv_node *src, int index)
{
if (src->format != MPV_FORMAT_NODE_ARRAY)
return NULL;
if (src->u.list->num < (index + 1))
return NULL;
return &src->u.list->values[index];
}
static void mpv_node_array_add(void *ta_parent, mpv_node *src, mpv_node *val)
{
if (src->format != MPV_FORMAT_NODE_ARRAY)
return;
if (!src->u.list)
src->u.list = talloc_zero(ta_parent, mpv_node_list);
MP_TARRAY_GROW(src->u.list, src->u.list->values, src->u.list->num);
static const struct m_option type = { .type = CONF_TYPE_NODE };
m_option_get_node(&type, ta_parent, &src->u.list->values[src->u.list->num], val);
src->u.list->num++;
}
static void mpv_node_array_add_string(void *ta_parent, mpv_node *src, const char *val)
{
mpv_node val_node = {.format = MPV_FORMAT_STRING, .u.string = (char *)val};
mpv_node_array_add(ta_parent, src, &val_node);
}
static void mpv_node_map_add(void *ta_parent, mpv_node *src, const char *key, mpv_node *val)
{
if (src->format != MPV_FORMAT_NODE_MAP)
return;
if (!src->u.list)
src->u.list = talloc_zero(ta_parent, mpv_node_list);
MP_TARRAY_GROW(src->u.list, src->u.list->keys, src->u.list->num);
MP_TARRAY_GROW(src->u.list, src->u.list->values, src->u.list->num);
src->u.list->keys[src->u.list->num] = talloc_strdup(ta_parent, key);
static const struct m_option type = { .type = CONF_TYPE_NODE };
m_option_get_node(&type, ta_parent, &src->u.list->values[src->u.list->num], val);
src->u.list->num++;
}
static void mpv_node_map_add_null(void *ta_parent, mpv_node *src, const char *key)
{
mpv_node val_node = {.format = MPV_FORMAT_NONE};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_node_map_add_flag(void *ta_parent, mpv_node *src, const char *key, bool val)
{
mpv_node val_node = {.format = MPV_FORMAT_FLAG, .u.flag = val};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_node_map_add_int64(void *ta_parent, mpv_node *src, const char *key, int64_t val)
{
mpv_node val_node = {.format = MPV_FORMAT_INT64, .u.int64 = val};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_node_map_add_double(void *ta_parent, mpv_node *src, const char *key, double val)
{
mpv_node val_node = {.format = MPV_FORMAT_DOUBLE, .u.double_ = val};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_node_map_add_string(void *ta_parent, mpv_node *src, const char *key, const char *val)
{
mpv_node val_node = {.format = MPV_FORMAT_STRING, .u.string = (char*)val};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_event_to_node(void *ta_parent, mpv_event *event, mpv_node *dst)
{
mpv_node_map_add_string(ta_parent, dst, "event", mpv_event_name(event->event_id));
if (event->reply_userdata)
mpv_node_map_add_int64(ta_parent, dst, "id", event->reply_userdata);
if (event->error < 0)
mpv_node_map_add_string(ta_parent, dst, "error", mpv_error_string(event->error));
switch (event->event_id) {
case MPV_EVENT_LOG_MESSAGE: {
mpv_event_log_message *msg = event->data;
mpv_node_map_add_string(ta_parent, dst, "prefix", msg->prefix);
mpv_node_map_add_string(ta_parent, dst, "level", msg->level);
mpv_node_map_add_string(ta_parent, dst, "text", msg->text);
break;
}
case MPV_EVENT_SCRIPT_INPUT_DISPATCH: {
mpv_event_script_input_dispatch *msg = event->data;
mpv_node_map_add_int64(ta_parent, dst, "arg0", msg->arg0);
mpv_node_map_add_string(ta_parent, dst, "type", msg->type);
break;
}
case MPV_EVENT_CLIENT_MESSAGE: {
mpv_event_client_message *msg = event->data;
mpv_node args_node = {.format = MPV_FORMAT_NODE_ARRAY, .u.list = NULL};
for (int n = 0; n < msg->num_args; n++)
mpv_node_array_add_string(ta_parent, &args_node, msg->args[n]);
mpv_node_map_add(ta_parent, dst, "args", &args_node);
break;
}
case MPV_EVENT_PROPERTY_CHANGE: {
mpv_event_property *prop = event->data;
mpv_node_map_add_string(ta_parent, dst, "name", prop->name);
switch (prop->format) {
case MPV_FORMAT_NODE:
mpv_node_map_add(ta_parent, dst, "data", prop->data);
break;
case MPV_FORMAT_DOUBLE:
mpv_node_map_add_double(ta_parent, dst, "data", *(double *)prop->data);
break;
case MPV_FORMAT_FLAG:
mpv_node_map_add_flag(ta_parent, dst, "data", *(int *)prop->data);
break;
case MPV_FORMAT_STRING:
mpv_node_map_add_string(ta_parent, dst, "data", *(char **)prop->data);
break;
default:
mpv_node_map_add_null(ta_parent, dst, "data");
}
break;
}
}
}
static char *json_encode_event(mpv_event *event)
{
void *ta_parent = talloc_new(NULL);
mpv_node event_node = {.format = MPV_FORMAT_NODE_MAP, .u.list = NULL};
mpv_event_to_node(ta_parent, event, &event_node);
char *output = talloc_strdup(NULL, "");
json_write(&output, &event_node);
output = ta_talloc_strdup_append(output, "\n");
talloc_free(ta_parent);
return output;
}
// Function is allowed to modify src[n].
static char *json_execute_command(struct client_arg *arg, void *ta_parent,
char *src)
{
int rc;
const char *cmd = NULL;
mpv_node msg_node;
mpv_node reply_node = {.format = MPV_FORMAT_NODE_MAP, .u.list = NULL};
rc = json_parse(ta_parent, &msg_node, &src, 3);
if (rc < 0) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (msg_node.format != MPV_FORMAT_NODE_MAP) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
mpv_node *cmd_node = mpv_node_map_get(&msg_node, "command");
if (!cmd_node ||
(cmd_node->format != MPV_FORMAT_NODE_ARRAY) ||
!cmd_node->u.list->num)
{
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
mpv_node *cmd_str_node = mpv_node_array_get(cmd_node, 0);
if (!cmd_str_node || (cmd_str_node->format != MPV_FORMAT_STRING)) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
cmd = cmd_str_node->u.string;
if (!strcmp("client_name", cmd)) {
const char *client_name = mpv_client_name(arg->client);
mpv_node_map_add_string(ta_parent, &reply_node, "data", client_name);
rc = MPV_ERROR_SUCCESS;
} else if (!strcmp("get_time_us", cmd)) {
int64_t time_us = mpv_get_time_us(arg->client);
mpv_node_map_add_int64(ta_parent, &reply_node, "data", time_us);
rc = MPV_ERROR_SUCCESS;
} else if (!strcmp("get_version", cmd)) {
int64_t ver = mpv_client_api_version();
mpv_node_map_add_int64(ta_parent, &reply_node, "data", ver);
rc = MPV_ERROR_SUCCESS;
} else if (!strcmp("get_property", cmd)) {
mpv_node result_node;
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_get_property(arg->client, cmd_node->u.list->values[1].u.string,
MPV_FORMAT_NODE, &result_node);
if (rc >= 0) {
mpv_node_map_add(ta_parent, &reply_node, "data", &result_node);
mpv_free_node_contents(&result_node);
}
} else if (!strcmp("get_property_string", cmd)) {
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
char *result = mpv_get_property_string(arg->client,
cmd_node->u.list->values[1].u.string);
if (!result) {
mpv_node_map_add_null(ta_parent, &reply_node, "data");
} else {
mpv_node_map_add_string(ta_parent, &reply_node, "data", result);
mpv_free(result);
}
} else if (!strcmp("set_property", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_set_property(arg->client, cmd_node->u.list->values[1].u.string,
MPV_FORMAT_NODE, &cmd_node->u.list->values[2]);
} else if (!strcmp("set_property_string", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[2].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_set_property_string(arg->client,
cmd_node->u.list->values[1].u.string,
cmd_node->u.list->values[2].u.string);
} else if (!strcmp("observe_property", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_INT64) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[2].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_observe_property(arg->client,
cmd_node->u.list->values[1].u.int64,
cmd_node->u.list->values[2].u.string,
MPV_FORMAT_NODE);
} else if (!strcmp("observe_property_string", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_INT64) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[2].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_observe_property(arg->client,
cmd_node->u.list->values[1].u.int64,
cmd_node->u.list->values[2].u.string,
MPV_FORMAT_STRING);
} else if (!strcmp("unobserve_property", cmd)) {
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_INT64) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_unobserve_property(arg->client,
cmd_node->u.list->values[1].u.int64);
} else if (!strcmp("request_log_messages", cmd)) {
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_request_log_messages(arg->client,
cmd_node->u.list->values[1].u.string);
} else if (!strcmp("suspend", cmd)) {
if (arg->suspend_counter < INT_MAX) {
mpv_suspend(arg->client);
arg->suspend_counter++;
rc = MPV_ERROR_SUCCESS;
} else {
rc = MPV_ERROR_INVALID_PARAMETER;
}
} else if (!strcmp("resume", cmd)) {
if (arg->suspend_counter > 0) {
mpv_resume(arg->client);
arg->suspend_counter--;
rc = MPV_ERROR_SUCCESS;
} else {
rc = MPV_ERROR_INVALID_PARAMETER;
}
} else {
mpv_node result_node;
rc = mpv_command_node(arg->client, cmd_node, &result_node);
if (rc >= 0)
mpv_node_map_add(ta_parent, &reply_node, "data", &result_node);
}
error:
mpv_node_map_add_string(ta_parent, &reply_node, "error", mpv_error_string(rc));
char *output = talloc_strdup(ta_parent, "");
json_write(&output, &reply_node);
output = ta_talloc_strdup_append(output, "\n");
return output;
}
static char *text_execute_command(struct client_arg *arg, void *tmp, char *src)
{
mpv_command_string(arg->client, src);
return NULL;
}
static int ipc_write(int fd, const char *buf, size_t count)
{
while (count > 0) {
ssize_t rc = write(fd, buf, count);
if (rc <= 0) {
if (rc == 0)
return ECONNRESET;
if (rc == EINTR)
continue;
if (rc == EAGAIN)
return 0;
return rc;
}
count -= rc;
buf += rc;
}
return 0;
}
static void *client_thread(void *p)
{
pthread_detach(pthread_self());
int rc;
struct client_arg *arg = p;
bstr client_msg = { talloc_strdup(NULL, ""), 0 };
mpthread_set_name(arg->client_name);
int pipe_fd = mpv_get_wakeup_pipe(arg->client);
if (pipe_fd < 0) {
MP_ERR(arg, "Could not get wakeup pipe\n");
goto done;
}
MP_INFO(arg, "Client connected\n");
struct pollfd fds[2] = {
{.events = POLLIN, .fd = pipe_fd},
{.events = POLLIN, .fd = arg->client_fd},
};
fcntl(arg->client_fd, F_SETFL, fcntl(arg->client_fd, F_GETFL, 0) | O_NONBLOCK);
while (1) {
rc = poll(fds, 2, -1);
if (rc < 0) {
MP_ERR(arg, "Poll error\n");
continue;
}
if (fds[0].revents & POLLIN) {
char discard[100];
read(pipe_fd, discard, sizeof(discard));
while (1) {
mpv_event *event = mpv_wait_event(arg->client, 0);
if (event->event_id == MPV_EVENT_NONE)
break;
if (event->event_id == MPV_EVENT_SHUTDOWN)
goto done;
if (!arg->writable)
continue;
char *event_msg = json_encode_event(event);
if (!event_msg) {
MP_ERR(arg, "Encoding error\n");
goto done;
}
rc = ipc_write(arg->client_fd, event_msg, strlen(event_msg));
talloc_free(event_msg);
if (rc < 0) {
MP_ERR(arg, "Write error\n");
goto done;
}
}
}
if (fds[1].revents & POLLIN) {
while (1) {
char buf[128];
bstr append = { buf, 0 };
ssize_t bytes = read(arg->client_fd, buf, sizeof(buf));
if (bytes < 0) {
if (errno == EAGAIN)
break;
MP_ERR(arg, "Read error\n");
goto done;
}
if (bytes == 0) {
MP_INFO(arg, "Client disconnected\n");
goto done;
}
append.len = bytes;
bstr_xappend(NULL, &client_msg, append);
while (bstrchr(client_msg, '\n') != -1) {
void *tmp = talloc_new(NULL);
bstr rest;
bstr line = bstr_getline(client_msg, &rest);
char *line0 = bstrto0(tmp, line);
talloc_steal(tmp, client_msg.start);
client_msg = bstrdup(NULL, rest);
json_skip_whitespace(&line0);
char *reply_msg = NULL;
if (line0[0] == '\0' || line0[0] == '#') {
// skip
} else if (line0[0] == '{') {
reply_msg = json_execute_command(arg, tmp, line0);
} else {
reply_msg = text_execute_command(arg, tmp, line0);
}
if (reply_msg && arg->writable) {
rc = ipc_write(arg->client_fd, reply_msg,
strlen(reply_msg));
if (rc < 0) {
MP_ERR(arg, "Write error\n");
talloc_free(tmp);
goto done;
}
}
talloc_free(tmp);
}
}
}
}
done:
talloc_free(client_msg.start);
if (arg->close_client_fd)
close(arg->client_fd);
mpv_detach_destroy(arg->client);
talloc_free(arg);
return NULL;
}
static void ipc_start_client(struct mp_ipc_ctx *ctx, struct client_arg *client)
{
client->client = mp_new_client(ctx->client_api, client->client_name),
client->log = mp_client_get_log(client->client);
pthread_t client_thr;
if (pthread_create(&client_thr, NULL, client_thread, client)) {
mpv_detach_destroy(client->client);
if (client->close_client_fd)
close(client->client_fd);
talloc_free(client);
}
}
static void ipc_start_client_json(struct mp_ipc_ctx *ctx, int id, int fd)
{
struct client_arg *client = talloc_ptrtype(NULL, client);
*client = (struct client_arg){
.client_name = talloc_asprintf(client, "ipc-%d", id),
.client_fd = fd,
.close_client_fd = true,
.writable = true,
};
ipc_start_client(ctx, client);
}
static void ipc_start_client_text(struct mp_ipc_ctx *ctx, const char *path)
{
int mode = O_RDONLY;
int client_fd = -1;
bool close_client_fd = true;
if (strcmp(path, "/dev/stdin") == 0) { // for symmetry with Linux
client_fd = STDIN_FILENO;
close_client_fd = false;
} else {
// Use RDWR for FIFOs to ensure they stay open over multiple accesses.
struct stat st;
if (stat(path, &st) == 0 && S_ISFIFO(st.st_mode))
mode = O_RDWR;
client_fd = open(path, mode);
}
if (client_fd < 0) {
MP_ERR(ctx, "Could not open pipe at '%s'\n", path);
return;
}
struct client_arg *client = talloc_ptrtype(NULL, client);
*client = (struct client_arg){
.client_name = "input-file",
.client_fd = client_fd,
.close_client_fd = close_client_fd,
.writable = false,
};
ipc_start_client(ctx, client);
}
static void *ipc_thread(void *p)
{
int rc;
int ipc_fd;
struct sockaddr_un ipc_un;
struct mp_ipc_ctx *arg = p;
mpthread_set_name("ipc socket listener");
MP_INFO(arg, "Starting IPC master\n");
ipc_fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (ipc_fd < 0) {
MP_ERR(arg, "Could not create IPC socket\n");
goto done;
}
size_t path_len = strlen(arg->path);
if (path_len >= sizeof(ipc_un.sun_path) - 1) {
MP_ERR(arg, "Could not create IPC socket\n");
goto done;
}
ipc_un.sun_family = AF_UNIX,
strncpy(ipc_un.sun_path, arg->path, sizeof(ipc_un.sun_path));
unlink(ipc_un.sun_path);
if (ipc_un.sun_path[0] == '@') {
ipc_un.sun_path[0] = '\0';
path_len--;
}
size_t addr_len = offsetof(struct sockaddr_un, sun_path) + 1 + path_len;
rc = bind(ipc_fd, (struct sockaddr *) &ipc_un, addr_len);
if (rc < 0) {
MP_ERR(arg, "Could not bind IPC socket\n");
goto done;
}
rc = listen(ipc_fd, 10);
if (rc < 0) {
MP_ERR(arg, "Could not listen on IPC socket\n");
goto done;
}
int client_num = 0;
struct pollfd fds[2] = {
{.events = POLLIN, .fd = arg->death_pipe[0]},
{.events = POLLIN, .fd = ipc_fd},
};
while (1) {
rc = poll(fds, 2, -1);
if (rc < 0) {
MP_ERR(arg, "Poll error\n");
continue;
}
if (fds[0].revents & POLLIN)
goto done;
if (fds[1].revents & POLLIN) {
int client_fd = accept(ipc_fd, NULL, NULL);
if (client_fd < 0) {
MP_ERR(arg, "Could not accept IPC client\n");
goto done;
}
ipc_start_client_json(arg, client_num++, client_fd);
}
}
done:
if (ipc_fd >= 0)
close(ipc_fd);
return NULL;
}
struct mp_ipc_ctx *mp_init_ipc(struct mp_client_api *client_api,
struct mpv_global *global)
{
struct MPOpts *opts = global->opts;
struct mp_ipc_ctx *arg = talloc_ptrtype(NULL, arg);
*arg = (struct mp_ipc_ctx){
.log = mp_log_new(arg, global->log, "ipc"),
.client_api = client_api,
.path = mp_get_user_path(arg, global, opts->ipc_path),
.death_pipe = {-1, -1},
};
char *input_file = mp_get_user_path(arg, global, opts->input_file);
if (input_file && *input_file)
ipc_start_client_text(arg, input_file);
if (!opts->ipc_path || !*opts->ipc_path)
goto out;
if (mp_make_wakeup_pipe(arg->death_pipe) < 0)
goto out;
if (pthread_create(&arg->thread, NULL, ipc_thread, arg))
goto out;
return arg;
out:
close(arg->death_pipe[0]);
close(arg->death_pipe[1]);
talloc_free(arg);
return NULL;
}
void mp_uninit_ipc(struct mp_ipc_ctx *arg)
{
if (!arg)
return;
write(arg->death_pipe[1], &(char){0}, 1);
pthread_join(arg->thread, NULL);
close(arg->death_pipe[0]);
close(arg->death_pipe[1]);
talloc_free(arg);
}
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