summaryrefslogtreecommitdiff
path: root/drivers/unix/socket_helpers.h
blob: 5b42c13eae12b7a2d2603110ce8a9e88364c1967 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/*************************************************************************/
/*  socket_helpers.h                                                     */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#ifndef SOCKET_HELPERS_H
#define SOCKET_HELPERS_H

#include <string.h>

#if defined(__MINGW32__) && (!defined(__MINGW64_VERSION_MAJOR) || __MINGW64_VERSION_MAJOR < 4)
// Workaround for mingw-w64 < 4.0
#ifndef IPV6_V6ONLY
#define IPV6_V6ONLY 27
#endif
#endif

// helpers for sockaddr -> IP_Address and back, should work for posix and winsock. All implementations should use this

static size_t _set_sockaddr(struct sockaddr_storage *p_addr, const IP_Address &p_ip, int p_port, IP::Type p_sock_type = IP::TYPE_ANY) {

	memset(p_addr, 0, sizeof(struct sockaddr_storage));

	ERR_FAIL_COND_V(!p_ip.is_valid(), 0);

	// IPv6 socket
	if (p_sock_type == IP::TYPE_IPV6 || p_sock_type == IP::TYPE_ANY) {

		// IPv6 only socket with IPv4 address
		ERR_FAIL_COND_V(p_sock_type == IP::TYPE_IPV6 && p_ip.is_ipv4(), 0);

		struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)p_addr;
		addr6->sin6_family = AF_INET6;
		addr6->sin6_port = htons(p_port);
		copymem(&addr6->sin6_addr.s6_addr, p_ip.get_ipv6(), 16);
		return sizeof(sockaddr_in6);

	} else { // IPv4 socket

		// IPv4 socket with IPv6 address
		ERR_FAIL_COND_V(!p_ip.is_ipv4(), 0);

		struct sockaddr_in *addr4 = (struct sockaddr_in *)p_addr;
		addr4->sin_family = AF_INET;
		addr4->sin_port = htons(p_port); // short, network byte order
		copymem(&addr4->sin_addr.s_addr, p_ip.get_ipv4(), 16);
		return sizeof(sockaddr_in);
	};
};

static size_t _set_listen_sockaddr(struct sockaddr_storage *p_addr, int p_port, IP::Type p_sock_type, const IP_Address p_bind_address) {

	memset(p_addr, 0, sizeof(struct sockaddr_storage));
	if (p_sock_type == IP::TYPE_IPV4) {
		struct sockaddr_in *addr4 = (struct sockaddr_in *)p_addr;
		addr4->sin_family = AF_INET;
		addr4->sin_port = htons(p_port);
		if (p_bind_address.is_valid()) {
			copymem(&addr4->sin_addr.s_addr, p_bind_address.get_ipv4(), 4);
		} else {
			addr4->sin_addr.s_addr = INADDR_ANY;
		}
		return sizeof(sockaddr_in);
	} else {
		struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)p_addr;

		addr6->sin6_family = AF_INET6;
		addr6->sin6_port = htons(p_port);
		if (p_bind_address.is_valid()) {
			copymem(&addr6->sin6_addr.s6_addr, p_bind_address.get_ipv6(), 16);
		} else {
			addr6->sin6_addr = in6addr_any;
		}
		return sizeof(sockaddr_in6);
	};
};

static int _socket_create(IP::Type &p_type, int type, int protocol) {

	ERR_FAIL_COND_V(p_type > IP::TYPE_ANY || p_type < IP::TYPE_NONE, ERR_INVALID_PARAMETER);

	int family = p_type == IP::TYPE_IPV4 ? AF_INET : AF_INET6;
	int sockfd = socket(family, type, protocol);

	if (sockfd == -1 && p_type == IP::TYPE_ANY) {
		// Careful here, changing the referenced parameter so the caller knows that we are using an IPv4 socket
		// in place of a dual stack one, and further calls to _set_sock_addr will work as expected.
		p_type = IP::TYPE_IPV4;
		family = AF_INET;
		sockfd = socket(family, type, protocol);
	}

	ERR_FAIL_COND_V(sockfd == -1, -1);

	if (family == AF_INET6) {
		// Select IPv4 over IPv6 mapping
		int opt = p_type != IP::TYPE_ANY;
		if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, (const char *)&opt, sizeof(opt)) != 0) {
			WARN_PRINT("Unable to set/unset IPv4 address mapping over IPv6");
		}
	}
	if (protocol == IPPROTO_UDP && p_type != IP::TYPE_IPV6) {
		// Enable broadcasting for UDP sockets if it's not IPv6 only (IPv6 has no broadcast option).
		int broadcast = 1;
		if (setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, (char *)&broadcast, sizeof(broadcast)) != 0) {
			WARN_PRINT("Error when enabling broadcasting");
		}
	}

	return sockfd;
}

static void _set_ip_addr_port(IP_Address &r_ip, int &r_port, struct sockaddr_storage *p_addr) {

	if (p_addr->ss_family == AF_INET) {

		struct sockaddr_in *addr4 = (struct sockaddr_in *)p_addr;
		r_ip.set_ipv4((uint8_t *)&(addr4->sin_addr.s_addr));

		r_port = ntohs(addr4->sin_port);

	} else if (p_addr->ss_family == AF_INET6) {

		struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)p_addr;
		r_ip.set_ipv6(addr6->sin6_addr.s6_addr);

		r_port = ntohs(addr6->sin6_port);
	};
};

#endif