// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <string.h>
#include <unistd.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "ctrl_sock.h"

/* Control socket, because in some network stacks select can't be woken up any
 * other way
 */
int cs_create_ctrl_sock(int port)
{
    int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if (fd < 0) {
        return -1;
    }

    int ret;
    struct sockaddr_in addr;
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    inet_aton("127.0.0.1", &addr.sin_addr);
    ret = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
    if (ret < 0) {
        close(fd);
        return -1;
    }
    return fd;
}

void cs_free_ctrl_sock(int fd)
{
    close(fd);
}

int cs_send_to_ctrl_sock(int send_fd, int port, void *data, unsigned int data_len)
{
    int ret;
    struct sockaddr_in to_addr;
    to_addr.sin_family = AF_INET;
    to_addr.sin_port = htons(port);
    inet_aton("127.0.0.1", &to_addr.sin_addr);
    ret = sendto(send_fd, data, data_len, 0, (struct sockaddr *)&to_addr, sizeof(to_addr));

    if (ret < 0) {
        return -1;
    }
    return ret;
}

int cs_recv_from_ctrl_sock(int fd, void *data, unsigned int data_len)
{
    int ret;
    ret = recvfrom(fd, data, data_len, 0, NULL, NULL);

    if (ret < 0) {
        return -1;
    }
    return ret;
}