libiio 0.26
Library for interfacing with IIO devices
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dns_sd.h
1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/*
3 * libiio - Library for interfacing industrial I/O (IIO) devices
4 *
5 * Copyright (C) 2014-2020 Analog Devices, Inc.
6 * Author: Paul Cercueil
7 * Robin Getz
8 */
9
10#ifndef __IIO_DNS_SD_H
11#define __IIO_DNS_SD_H
12
13#include <stdbool.h>
14#include <stdint.h>
15
16#ifdef _WIN32
17#include <winsock2.h>
18#include <ntddndis.h>
19#include <netioapi.h>
20#else
21#include <net/if.h>
22#include <sys/param.h>
23#endif
24
25/* IPv6 Max = 4*8 + 7 + 1 for '%' + interface length */
26#define DNS_SD_ADDRESS_STR_MAX (40 + IF_NAMESIZE)
27#define FQDN_LEN (255) /* RFC 1035 */
28
29/* MacOS doesn't include ENOMEDIUM (No medium found) like Linux does */
30#ifndef ENOMEDIUM
31#define ENOMEDIUM ENOENT
32#endif
33
34/* Used everywhere */
35#define IIOD_PORT 30431
36
37struct addrinfo;
38struct AvahiSimplePoll;
39struct AvahiAddress;
40
41/* Common structure which all dns_sd_[*] files fill out
42 * Anything that is dynamically allocated (malloc) needs to be managed
43 */
44struct dns_sd_discovery_data {
45 struct iio_mutex *lock;
46 struct AvahiSimplePoll *poll;
47 struct AvahiAddress *address;
48 uint16_t found, resolved;
49 char addr_str[DNS_SD_ADDRESS_STR_MAX];
50 char *hostname;
51 uint16_t port, iface;
52 struct dns_sd_discovery_data *next;
53};
54
55
56/* This functions is implemented in network.c, but used in dns_sd.c
57 */
58int create_socket(const struct addrinfo *addrinfo);
59
60/* These functions are common, and implemented in dns_sd_[*].c based on the
61 * implementations: avahi (linux), bonjour (mac), or ServiceDiscovery (Win10)
62 */
63
64/* Resolves all IIO hosts on the available networks, and passes back a linked list */
65int dnssd_find_hosts(struct dns_sd_discovery_data ** ddata);
66
67/* Deallocates complete list of discovery data */
68void dnssd_free_all_discovery_data(struct dns_sd_discovery_data *d);
69
70/* These functions are common, and found in dns_sd.c, but are used in the
71 * dns_sd_[*].c implementations or network.c
72 */
73
74/* Passed back the first (random) IIOD service resolved by DNS DS. */
75int dnssd_discover_host(char *addr_str, size_t addr_len, uint16_t *port);
76
77/* remove duplicates from the list */
78void remove_dup_discovery_data(struct dns_sd_discovery_data **ddata);
79
80/* port knocks */
81void port_knock_discovery_data(struct dns_sd_discovery_data **ddata);
82
83/* Use dnssd to resolve a given hostname */
84int dnssd_resolve_host(const char *hostname, char *ip_addr, const int addr_len);
85
86#endif /* __IIO_DNS_SD_H */