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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <assert.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <asm/byteorder.h>
#include <talloc/talloc.h>
#include <waiter/waiter.h>
#include <log/log.h>
#include "pb-protocol/pb-protocol.h"
#include "list/list.h"
#include "device-handler.h"
#include "discover-server.h"
struct discover_server {
int socket;
struct waiter *waiter;
struct list clients;
struct device_handler *device_handler;
};
struct client {
struct list_item list;
int fd;
};
static int server_destructor(void *arg)
{
struct discover_server *server = arg;
if (server->waiter)
waiter_remove(server->waiter);
if (server->socket >= 0)
close(server->socket);
return 0;
}
static int client_destructor(void *arg)
{
struct client *client = arg;
if (client->fd >= 0)
close(client->fd);
list_remove(&client->list);
return 0;
}
static void print_clients(struct discover_server *server)
__attribute__((unused));
static void print_clients(struct discover_server *server)
{
struct client *client;
pb_log("current clients [%p,%p,%p]:\n",
&server->clients.head,
server->clients.head.prev,
server->clients.head.next);
list_for_each_entry(&server->clients, client, list)
pb_log("\t[%p,%p,%p] client: %d\n", &client->list,
client->list.prev, client->list.next,
client->fd);
}
static int client_write_message(
struct discover_server *server __attribute__((unused)),
struct client *client, struct pb_protocol_message *message)
{
int rc;
rc = pb_protocol_write_message(client->fd, message);
if (rc)
talloc_free(client);
return rc;
}
static int write_add_message(struct discover_server *server,
struct client *client, const struct device *dev)
{
struct pb_protocol_message *message;
int len;
len = pb_protocol_device_len(dev);
message = pb_protocol_create_message(client,
PB_PROTOCOL_ACTION_ADD, len);
if (!message)
return -1;
pb_protocol_serialise_device(dev, message->payload, len);
return client_write_message(server, client, message);
}
static int write_remove_message(struct discover_server *server,
struct client *client, char *dev_id)
{
struct pb_protocol_message *message;
int len;
len = strlen(dev_id) + sizeof(uint32_t);
message = pb_protocol_create_message(client,
PB_PROTOCOL_ACTION_REMOVE, len);
if (!message)
return -1;
pb_protocol_serialise_string(message->payload, dev_id);
return client_write_message(server, client, message);
}
static int discover_server_process(void *arg)
{
struct discover_server *server = arg;
const struct device *devices;
struct client *client;
int fd, i, n_devices;
/* accept the incoming connection */
fd = accept(server->socket, NULL, 0);
if (!fd) {
pb_log("accept: %s\n", strerror(errno));
return 0;
}
/* add to our list of clients */
client = talloc(server, struct client);
list_add(&server->clients, &client->list);
talloc_set_destructor(client, client_destructor);
client->fd = fd;
/* send existing devices to client */
n_devices = device_handler_get_current_devices(server->device_handler,
&devices);
for (i = 0; i < n_devices; i++)
write_add_message(server, client, &devices[i]);
return 0;
}
void discover_server_notify_add(struct discover_server *server,
struct device *device)
{
struct client *client;
list_for_each_entry(&server->clients, client, list)
write_add_message(server, client, device);
}
void discover_server_notify_remove(struct discover_server *server,
struct device *device)
{
struct client *client;
list_for_each_entry(&server->clients, client, list)
write_remove_message(server, client, device->id);
}
void discover_server_set_device_source(struct discover_server *server,
struct device_handler *handler)
{
server->device_handler = handler;
}
struct discover_server *discover_server_init(void)
{
struct discover_server *server;
struct sockaddr_un addr;
server = talloc(NULL, struct discover_server);
if (!server)
return NULL;
server->waiter = NULL;
list_init(&server->clients);
unlink(PB_SOCKET_PATH);
server->socket = socket(AF_UNIX, SOCK_STREAM, 0);
if (server->socket < 0) {
pb_log("error creating server socket: %s\n", strerror(errno));
goto out_err;
}
talloc_set_destructor(server, server_destructor);
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, PB_SOCKET_PATH);
if (bind(server->socket, (struct sockaddr *)&addr, sizeof(addr))) {
pb_log("error binding server socket: %s\n", strerror(errno));
goto out_err;
}
if (listen(server->socket, 8)) {
pb_log("server socket listen: %s\n", strerror(errno));
goto out_err;
}
server->waiter = waiter_register(server->socket, WAIT_IN,
discover_server_process, server);
return server;
out_err:
talloc_free(server);
return NULL;
}
void discover_server_destroy(struct discover_server *server)
{
talloc_free(server);
}
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