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/* PipeWire AGL Cluster IPC
*
* Copyright © 2021 Collabora Ltd.
* @author Julian Bouzas <julian.bouzas@collabora.com>
*
* SPDX-License-Identifier: MIT
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/epoll.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "private.h"
#include "receiver.h"
#include "icipc.h"
#define MAX_SENDERS 128
struct icipc_receiver {
struct sockaddr_un addr;
int socket_fd;
uint8_t *buffer_read;
size_t buffer_size;
struct epoll_thread epoll_thread;
bool thread_running;
const struct icipc_receiver_events *events;
void *events_data;
/* for subclasses */
void *user_data;
};
static bool
reply_message (struct icipc_receiver *self,
int sender_fd,
uint8_t *buffer,
size_t size)
{
return self->events && self->events->handle_message ?
self->events->handle_message (self, sender_fd, buffer, size, self->events_data) :
icipc_socket_write (sender_fd, buffer, size) == (ssize_t)size;
}
static void
socket_event_received (struct epoll_thread *t, int fd, void *data)
{
/* sender wants to connect, accept connection */
struct icipc_receiver *self = data;
socklen_t addr_size = sizeof(self->addr);
int sender_fd = accept4 (fd, (struct sockaddr*)&self->addr, &addr_size,
SOCK_CLOEXEC | SOCK_NONBLOCK);
struct epoll_event event;
event.events = EPOLLIN;
event.data.fd = sender_fd;
epoll_ctl (t->epoll_fd, EPOLL_CTL_ADD, sender_fd, &event);
if (self->events && self->events->sender_state)
self->events->sender_state (self, sender_fd,
ICIPC_RECEIVER_SENDER_STATE_CONNECTED, self->events_data);
}
static void
other_event_received (struct epoll_thread *t, int fd, void *data)
{
struct icipc_receiver *self = data;
/* sender sends a message, read it and reply */
ssize_t size = icipc_socket_read (fd, &self->buffer_read, &self->buffer_size);
if (size <= 0) {
if (size < 0)
icipc_log_error ("receiver: could not read message: %s", strerror(errno));
/* client disconnected */
epoll_ctl (t->epoll_fd, EPOLL_CTL_DEL, fd, NULL);
close (fd);
if (self->events && self->events->sender_state)
self->events->sender_state (self, fd,
ICIPC_RECEIVER_SENDER_STATE_DISCONNECTED, self->events_data);
return;
}
/* reply */
if (!reply_message (self, fd, self->buffer_read, size))
icipc_log_error ("receiver: could not reply message: %s", strerror(errno));
return;
}
/* API */
struct icipc_receiver *
icipc_receiver_new (const char *path,
size_t buffer_size,
const struct icipc_receiver_events *events,
void *events_data,
size_t user_size)
{
struct icipc_receiver *self;
int res;
/* check params */
if (path == NULL || buffer_size == 0)
return NULL;
self = calloc (1, sizeof (struct icipc_receiver) + user_size);
if (self == NULL)
return NULL;
self->socket_fd = -1;
/* set address */
self->addr.sun_family = AF_LOCAL;
res = icipc_construct_socket_path (path, self->addr.sun_path, sizeof(self->addr.sun_path));
if (res < 0)
goto error;
unlink (self->addr.sun_path);
/* create socket */
self->socket_fd =
socket(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
if (self->socket_fd < 0)
goto error;
/* bind socket */
if (bind (self->socket_fd, (struct sockaddr *)&self->addr,
sizeof(self->addr)) != 0)
goto error;
/* listen socket */
if (listen (self->socket_fd, MAX_SENDERS) != 0)
goto error;
/* alloc buffer read */
self->buffer_size = buffer_size;
self->buffer_read = calloc (buffer_size, sizeof (uint8_t));
if (self->buffer_read == NULL)
goto error;
/* init epoll thread */
if (!icipc_epoll_thread_init (&self->epoll_thread, self->socket_fd,
socket_event_received, other_event_received, self))
goto error;
self->events = events;
self->events_data = events_data;
if (user_size > 0)
self->user_data = (void *)((uint8_t *)self + sizeof (struct icipc_receiver));
return self;
error:
if (self->buffer_read)
free (self->buffer_read);
if (self->socket_fd != -1)
close (self->socket_fd);
free (self);
return NULL;
}
void
icipc_receiver_free (struct icipc_receiver *self)
{
icipc_receiver_stop (self);
icipc_epoll_thread_destroy (&self->epoll_thread);
free (self->buffer_read);
close (self->socket_fd);
unlink (self->addr.sun_path);
free (self);
}
bool
icipc_receiver_start (struct icipc_receiver *self)
{
if (icipc_receiver_is_running (self))
return true;
self->thread_running = icipc_epoll_thread_start (&self->epoll_thread);
return self->thread_running;
}
void
icipc_receiver_stop (struct icipc_receiver *self)
{
if (icipc_receiver_is_running (self)) {
icipc_epoll_thread_stop (&self->epoll_thread);
self->thread_running = false;
}
}
bool
icipc_receiver_is_running (struct icipc_receiver *self)
{
return self->thread_running;
}
void *
icipc_receiver_get_user_data (struct icipc_receiver *self)
{
return self->user_data;
}
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