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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 <sys/socket.h>
#include <sys/un.h>
#include <sys/epoll.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#ifdef HAVE_SYSTEMD
#include <systemd/sd-daemon.h>
#endif
#include "private.h"
#include "receiver.h"
#include "icipc.h"
#define MAX_SENDERS 128
struct icipc_receiver {
struct sockaddr_un addr;
int socket_fd;
bool activated;
uint8_t *buffer_read;
size_t buffer_size;
EpollThread 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(EpollThread *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 = {0};
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(EpollThread *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;
#ifdef HAVE_SYSTEMD
{
int i, n = sd_listen_fds(0);
for (i = 0; i < n; ++i) {
if (sd_is_socket_unix(SD_LISTEN_FDS_START + i,
SOCK_STREAM, 1,
self->addr.sun_path, 0) > 0) {
self->socket_fd = SD_LISTEN_FDS_START + i;
self->activated = true;
icipc_log_info("receiver %p: Found socket "
"activation socket for '%s'",
self, self->addr.sun_path);
break;
}
}
}
#endif
if (self->socket_fd < 0) {
struct stat socket_stat;
/* create socket */
self->socket_fd =
socket(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
if (self->socket_fd < 0)
goto error;
if (stat(self->addr.sun_path, &socket_stat) < 0) {
if (errno != ENOENT) {
res = -errno;
icipc_log_error("receiver %p: stat %s failed "
"with error: %m",
self, self->addr.sun_path);
goto error;
}
} else if (socket_stat.st_mode & S_IWUSR ||
socket_stat.st_mode & S_IWGRP) {
unlink(self->addr.sun_path);
}
/* 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);
if (!self->activated)
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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