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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* Copyright 2012-2019 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef IPV4_ADDRESS_HXX
#define IPV4_ADDRESS_HXX
#include "SocketAddress.hxx"
#include "util/ByteOrder.hxx"
#include <cstdint>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <netinet/in.h>
#endif
/**
* An OO wrapper for struct sockaddr_in.
*/
class IPv4Address {
struct sockaddr_in address;
#ifdef _WIN32
static constexpr struct in_addr ConstructInAddr(uint8_t a, uint8_t b,
uint8_t c, uint8_t d) noexcept {
struct in_addr result{};
result.s_net = a;
result.s_host = b;
result.s_lh = c;
result.s_impno = d;
return result;
}
#else
#ifdef __BIONIC__
typedef uint32_t in_addr_t;
#endif
static constexpr in_addr_t ConstructInAddrT(uint8_t a, uint8_t b,
uint8_t c, uint8_t d) noexcept {
return ToBE32((a << 24) | (b << 16) | (c << 8) | d);
}
static constexpr struct in_addr ConstructInAddr(uint8_t a, uint8_t b,
uint8_t c, uint8_t d) noexcept {
return ConstructInAddrBE(ConstructInAddrT(a, b, c, d));
}
#endif
/**
* @param x the 32 bit IP address in network byte order
*/
static constexpr struct in_addr ConstructInAddrBE(uint32_t x) noexcept {
struct in_addr ia{};
ia.s_addr = x;
return ia;
}
/**
* @param x the 32 bit IP address in host byte order
*/
static constexpr struct in_addr ConstructInAddr(uint32_t x) noexcept {
return ConstructInAddrBE(ToBE32(x));
}
/**
* @param port the port number in host byte order
*/
static constexpr struct sockaddr_in Construct(struct in_addr address,
uint16_t port) noexcept {
struct sockaddr_in sin{};
sin.sin_family = AF_INET;
sin.sin_port = ToBE16(port);
sin.sin_addr = address;
return sin;
}
/**
* @param x the 32 bit IP address in host byte order
* @param port the port number in host byte order
*/
static constexpr struct sockaddr_in Construct(uint32_t address,
uint16_t port) noexcept {
return Construct(ConstructInAddr(address), port);
}
public:
IPv4Address() = default;
constexpr IPv4Address(const struct sockaddr_in &_address) noexcept
:address(_address) {}
/**
* @param port the port number in host byte order
*/
constexpr IPv4Address(struct in_addr _address, uint16_t port) noexcept
:IPv4Address(Construct(_address, port)) {}
/**
* @param port the port number in host byte order
*/
constexpr IPv4Address(uint8_t a, uint8_t b, uint8_t c,
uint8_t d, uint16_t port) noexcept
:IPv4Address(ConstructInAddr(a, b, c, d), port) {}
/**
* @param port the port number in host byte order
*/
constexpr explicit IPv4Address(uint16_t port) noexcept
:IPv4Address(ConstructInAddr(INADDR_ANY), port) {}
/**
* Construct with data copied from a #SocketAddress. Its
* address family must be AF_INET.
*/
explicit IPv4Address(SocketAddress src) noexcept;
static constexpr struct in_addr Loopback() noexcept {
return ConstructInAddr(INADDR_LOOPBACK);
}
/**
* Generate a (net-)mask with the specified prefix length.
*/
static constexpr IPv4Address MaskFromPrefix(unsigned prefix_length) noexcept {
return Construct(prefix_length == 0
? 0
: (~uint32_t(0)) << (32 - prefix_length),
~uint16_t(0));
}
/**
* Return a downcasted reference to the address. This call is
* only legal after verifying SocketAddress::GetFamily().
*/
static constexpr const IPv4Address &Cast(const SocketAddress &src) noexcept {
/* this reinterpret_cast works because this class is
just a wrapper for struct sockaddr_in */
return *(const IPv4Address *)(const void *)src.GetAddress();
}
constexpr operator SocketAddress() const noexcept {
return SocketAddress((const struct sockaddr *)(const void *)&address,
sizeof(address));
}
constexpr SocketAddress::size_type GetSize() const noexcept {
return sizeof(address);
}
constexpr bool IsDefined() const noexcept {
return address.sin_family != AF_UNSPEC;
}
/**
* @return the port number in host byte order
*/
constexpr uint16_t GetPort() const noexcept {
return FromBE16(address.sin_port);
}
/**
* @param port the port number in host byte order
*/
void SetPort(uint16_t port) noexcept {
address.sin_port = ToBE16(port);
}
constexpr const struct in_addr &GetAddress() const noexcept {
return address.sin_addr;
}
/**
* @return the 32 bit IP address in network byte order
*/
constexpr uint32_t GetNumericAddressBE() const noexcept {
return GetAddress().s_addr;
}
/**
* @return the 32 bit IP address in host byte order
*/
constexpr uint32_t GetNumericAddress() const noexcept {
return FromBE32(GetNumericAddressBE());
}
/**
* Bit-wise AND of two addresses. This is useful for netmask
* calculations.
*/
constexpr IPv4Address operator&(const IPv4Address &other) const noexcept {
return IPv4Address(ConstructInAddrBE(GetNumericAddressBE() & other.GetNumericAddressBE()),
GetPort() & other.GetPort());
}
};
#endif
|
