1  // Copyright 2018 Espressif Systems (Shanghai) PTE LTD
 2  //
 3  // Licensed under the Apache License, Version 2.0 (the "License");
 4  // you may not use this file except in compliance with the License.
 5  // You may obtain a copy of the License at
 6  //
 7  //     http://www.apache.org/licenses/LICENSE-2.0
 8  //
 9  // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  #include <string.h>
16  #include <unistd.h>
17  
18  #include <sys/socket.h>
19  #include <netinet/in.h>
20  #include <arpa/inet.h>
21  
22  #include "ctrl_sock.h"
23  
24  /* Control socket, because in some network stacks select can't be woken up any
25   * other way
26   */
27  int cs_create_ctrl_sock(int port)
28  {
29      int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
30      if (fd < 0) {
31          return -1;
32      }
33  
34      int ret;
35      struct sockaddr_in addr;
36      memset(&addr, 0, sizeof(addr));
37      addr.sin_family = AF_INET;
38      addr.sin_port = htons(port);
39      inet_aton("127.0.0.1", &addr.sin_addr);
40      ret = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
41      if (ret < 0) {
42          close(fd);
43          return -1;
44      }
45      return fd;
46  }
47  
48  void cs_free_ctrl_sock(int fd)
49  {
50      close(fd);
51  }
52  
53  int cs_send_to_ctrl_sock(int send_fd, int port, void *data, unsigned int data_len)
54  {
55      int ret;
56      struct sockaddr_in to_addr;
57      to_addr.sin_family = AF_INET;
58      to_addr.sin_port = htons(port);
59      inet_aton("127.0.0.1", &to_addr.sin_addr);
60      ret = sendto(send_fd, data, data_len, 0, (struct sockaddr *)&to_addr, sizeof(to_addr));
61  
62      if (ret < 0) {
63          return -1;
64      }
65      return ret;
66  }
67  
68  int cs_recv_from_ctrl_sock(int fd, void *data, unsigned int data_len)
69  {
70      int ret;
71      ret = recvfrom(fd, data, data_len, 0, NULL, NULL);
72  
73      if (ret < 0) {
74          return -1;
75      }
76      return ret;
77  }