lduchosal / ipnetwork / 795

Committed 15 Aug 2025 01:50PM UTC coverage: 93.543% (+0.007%) from 93.536%

Build # 795

Build Type

push

appveyor

Committed by

web-flow

Commit Message

Fix: usable count according to CIDR reference (#360)

* Fix: usable count according to CIDR reference

Run Details

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97.7

/src/System.Net.IPNetwork/IPNetwork2Members.cs

// <copyright file="IPNetwork2Members.cs" company="IPNetwork">
// Copyright (c) IPNetwork. All rights reserved.
// </copyright>

namespace System.Net;

using System.Numerics;
using System.Net.Sockets;
using System.Runtime.Serialization;

/// <summary>
/// Properties and members of IPNetwork2.
/// </summary>
public partial class IPNetwork2
{
    private readonly object sync = new ();
    private readonly int hashCode;
    private BigInteger ipaddress;
    private byte cidr;
    private BigInteger? cachedBroadcast;

    private AddressFamily family;

    /// <summary>
    /// Gets or sets a value indicating whether gets or sets the value of the IPNetwork property.
    /// </summary>
    [DataMember(Name = "IPNetwork", IsRequired = true)]
    public string Value
    {
        get
        {
            return this.ToString();
        }

        set
        {
            var ipnetwork = Parse(value);
            this.ipaddress = ipnetwork.ipaddress;
            this.family = ipnetwork.family;
            this.cidr = ipnetwork.cidr;
            lock (this.sync)
            {
                this.cachedBroadcast = null;
            }
        }
    }

    /// <summary>
    /// Gets network address.
    /// </summary>
    public IPAddress Network
    {
        get
        {
            return ToIPAddress(this.InternalNetwork, this.family);
        }
    }

    /// <summary>
    /// Gets address Family.
    /// </summary>
    public AddressFamily AddressFamily
    {
        get
        {
            return this.family;
        }
    }

    /// <summary>
    /// Gets netmask.
    /// </summary>
    public IPAddress Netmask
    {
        get
        {
            return ToIPAddress(this.InternalNetmask, this.family);
        }
    }

    /// <summary>
    /// Gets broadcast address.
    /// </summary>
    public IPAddress Broadcast
    {
        get
        {
            if (this.family == AddressFamily.InterNetworkV6)
            {
                return null;
            }

            return ToIPAddress(this.InternalBroadcast, this.family);
        }
    }

    /// <summary>
    /// Gets first usable IPAddress in Network.
    /// </summary>
    public IPAddress FirstUsable
    {
        get
        {
            BigInteger first = this.family == AddressFamily.InterNetworkV6
                ? this.InternalNetwork
                : (this.Usable <= 1)
                    ? this.InternalNetwork
                    : this.InternalNetwork + 1;
            return ToIPAddress(first, this.family);
        }
    }

    /// <summary>
    /// Gets last usable IPAddress in Network.
    /// </summary>
    public IPAddress LastUsable
    {
        get
        {
            BigInteger last = this.family == AddressFamily.InterNetworkV6
                ? this.InternalBroadcast
                : (this.Usable <= 1)
                    ? this.InternalNetwork
                    : this.InternalBroadcast - 1;
            return ToIPAddress(last, this.family);
        }
    }

    /// <summary>
    /// Gets number of usable IPAddress in Network.
    /// 
    /// According to : https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#IPv4_CIDR_blocks
    /// Address         Mask                        Total         Usable         Network         Broadcast         FirstUsable         LastUsable         Typical use
    /// 1.0.0.1/32         255.255.255.255         1         **1**         1.0.0.1         1.0.0.1         1.0.0.1         1.0.0.1         Host route
    /// 1.0.0.1/31         255.255.255.254         2         **2**         1.0.0.1         1.0.0.2         1.0.0.1         1.0.0.2         Point-to-point links (RFC 3021)
    /// ...
    /// </summary>
    public BigInteger Usable
    {
        get
        {
            if (this.family == AddressFamily.InterNetworkV6)
            {
                return this.Total;
            }

            byte[] mask = [0xff, 0xff, 0xff, 0xff, 0x00];
            var bmask = new BigInteger(mask);
            BigInteger usableIps = (this.cidr == 32)? 1
                : (this.cidr == 31)? 2
                : ((bmask >> this.cidr)- 1);
            return usableIps;
        }
    }

    /// <summary>
    /// Gets number of IPAddress in Network.
    /// </summary>
    public BigInteger Total
    {
        get
        {
            int max = this.family == AddressFamily.InterNetwork ? 32 : 128;
            var count = BigInteger.Pow(2, max - this.cidr);
            return count;
        }
    }

    /// <summary>
    /// Gets the CIDR netmask notation.
    /// </summary>
    public byte Cidr
    {
        get
        {
            return this.cidr;
        }
    }

    /// <summary>
    /// Gets the broadcast address calculated from the network address and the netmask.
    /// </summary>
    internal BigInteger InternalBroadcast
    {
        get
        {
            var cached = this.cachedBroadcast;
            if (cached != null)
            {
                return cached.Value;
            }

            lock (this.sync)
            {
                var cached2 = this.cachedBroadcast;
                if (cached2 != null)
                {
                    return cached2.Value;
                }

                var network = this.InternalNetwork;
                var computed = CreateBroadcast(ref network, this.InternalNetmask, this.family);
                this.cachedBroadcast = computed;
                return computed;
            }
        }
    }

    /// <summary>
    /// Gets the network address calculated by applying the subnet mask to the IP address.
    /// </summary>
    internal BigInteger InternalNetwork
    {
        get
        {
            BigInteger uintNetwork = this.ipaddress & this.InternalNetmask;
            return uintNetwork;
        }
    }

    /// <summary>
    /// Gets the netmask as a BigInteger representation based on the CIDR and address family.
    /// </summary>
    internal BigInteger InternalNetmask
    {
        get
        {
            return ToUint(this.cidr, this.family);
        }
    }
}

1	// <copyright file="IPNetwork2Members.cs" company="IPNetwork">
2	// Copyright (c) IPNetwork. All rights reserved.
3	// </copyright>
4
5	namespace System.Net;
6
7	using System.Numerics;
8	using System.Net.Sockets;
9	using System.Runtime.Serialization;
10
11	/// <summary>
12	/// Properties and members of IPNetwork2.
13	/// </summary>
14	public partial class IPNetwork2
15	{
16	private readonly object sync = new ();	8,136,610✔
17	private readonly int hashCode;
18	private BigInteger ipaddress;
19	private byte cidr;
20	private BigInteger? cachedBroadcast;
21
22	private AddressFamily family;
23
24	/// <summary>
25	/// Gets or sets a value indicating whether gets or sets the value of the IPNetwork property.
26	/// </summary>
27	[DataMember(Name = "IPNetwork", IsRequired = true)]
28	public string Value
29	{
30	get
31	{	2,000,002✔
32	return this.ToString();	2,000,002✔
33	}	2,000,002✔
34
35	set
36	{	2,000,004✔
37	var ipnetwork = Parse(value);	2,000,004✔
38	this.ipaddress = ipnetwork.ipaddress;	2,000,004✔
39	this.family = ipnetwork.family;	2,000,004✔
40	this.cidr = ipnetwork.cidr;	2,000,004✔
41	lock (this.sync)	2,000,004✔
42	{	2,000,004✔
43	this.cachedBroadcast = null;	2,000,004✔
44	}	2,000,004✔
45	}	2,000,004✔
46	}
47
48	/// <summary>
49	/// Gets network address.
50	/// </summary>
51	public IPAddress Network
52	{
53	get
54	{	4,138,184✔
55	return ToIPAddress(this.InternalNetwork, this.family);	4,138,184✔
56	}	4,138,184✔
57	}
58
59	/// <summary>
60	/// Gets address Family.
61	/// </summary>
62	public AddressFamily AddressFamily
63	{
64	get
65	{	135,736✔
66	return this.family;	135,736✔
67	}	135,736✔
68	}
69
70	/// <summary>
71	/// Gets netmask.
72	/// </summary>
73	public IPAddress Netmask
74	{
75	get
76	{	367✔
77	return ToIPAddress(this.InternalNetmask, this.family);	367✔
78	}	367✔
79	}
80
81	/// <summary>
82	/// Gets broadcast address.
83	/// </summary>
84	public IPAddress Broadcast
85	{
86	get
87	{	67,266✔
88	if (this.family == AddressFamily.InterNetworkV6)	67,266✔
89	{	31✔
90	return null;	31✔
91	}
92
93	return ToIPAddress(this.InternalBroadcast, this.family);	67,235✔
94	}	67,266✔
95	}
96
97	/// <summary>
98	/// Gets first usable IPAddress in Network.
99	/// </summary>
100	public IPAddress FirstUsable
101	{
102	get
103	{	2,355✔
104	BigInteger first = this.family == AddressFamily.InterNetworkV6	2,355✔
105	? this.InternalNetwork	2,355✔
106	: (this.Usable <= 1)	2,355✔
107	? this.InternalNetwork	2,355✔
108	: this.InternalNetwork + 1;	2,355✔
109	return ToIPAddress(first, this.family);	2,355✔
110	}	2,355✔
111	}
112
113	/// <summary>
114	/// Gets last usable IPAddress in Network.
115	/// </summary>
116	public IPAddress LastUsable
117	{
118	get
119	{	2,874✔
120	BigInteger last = this.family == AddressFamily.InterNetworkV6	2,874✔
121	? this.InternalBroadcast	2,874✔
122	: (this.Usable <= 1)	2,874✔
123	? this.InternalNetwork	2,874✔
124	: this.InternalBroadcast - 1;	2,874✔
125	return ToIPAddress(last, this.family);	2,874✔
126	}	2,874✔
127	}
128
129	/// <summary>
130	/// Gets number of usable IPAddress in Network.
131	///
132	/// According to : https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#IPv4_CIDR_blocks
133	/// Address Mask Total Usable Network Broadcast FirstUsable LastUsable Typical use
134	/// 1.0.0.1/32 255.255.255.255 1 1 1.0.0.1 1.0.0.1 1.0.0.1 1.0.0.1 Host route
135	/// 1.0.0.1/31 255.255.255.254 2 2 1.0.0.1 1.0.0.2 1.0.0.1 1.0.0.2 Point-to-point links (RFC 3021)
136	/// ...
137	/// </summary>
138	public BigInteger Usable
139	{
140	get
141	{	2,972✔
142	if (this.family == AddressFamily.InterNetworkV6)	2,972✔
143	{	32✔
144	return this.Total;	32✔
145	}
146
147	byte[] mask = [0xff, 0xff, 0xff, 0xff, 0x00];	2,940✔
148	var bmask = new BigInteger(mask);	2,940✔
149	BigInteger usableIps = (this.cidr == 32)? 1	2,940✔
150	: (this.cidr == 31)? 2	2,940✔
151	: ((bmask >> this.cidr)- 1);	2,940✔
152	return usableIps;	2,940✔
153	}	2,972✔
154	}
155
156	/// <summary>
157	/// Gets number of IPAddress in Network.
158	/// </summary>
159	public BigInteger Total
160	{
161	get
162	{	2,601✔
163	int max = this.family == AddressFamily.InterNetwork ? 32 : 128;	2,601✔
164	var count = BigInteger.Pow(2, max - this.cidr);	2,601✔
165	return count;	2,601✔
166	}	2,601✔
167	}
168
169	/// <summary>
170	/// Gets the CIDR netmask notation.
171	/// </summary>
172	public byte Cidr
173	{
174	get
175	{	4,208,155✔
176	return this.cidr;	4,208,155✔
177	}	4,208,155✔
178	}
179
180	/// <summary>
181	/// Gets the broadcast address calculated from the network address and the netmask.
182	/// </summary>
183	internal BigInteger InternalBroadcast
184	{
185	get
186	{	666,435✔
187	var cached = this.cachedBroadcast;	666,435✔
188	if (cached != null)	666,435✔
189	{	531,784✔
190	return cached.Value;	531,784✔
191	}
192
193	lock (this.sync)	134,651✔
194	{	134,651✔
195	var cached2 = this.cachedBroadcast;	134,651✔
196	if (cached2 != null)	134,651✔
197	{	×
198	return cached2.Value;	×
199	}
200
201	var network = this.InternalNetwork;	134,651✔
202	var computed = CreateBroadcast(ref network, this.InternalNetmask, this.family);	134,651✔
203	this.cachedBroadcast = computed;	134,651✔
204	return computed;	134,651✔
205	}
206	}	666,435✔
207	}
208
209	/// <summary>
210	/// Gets the network address calculated by applying the subnet mask to the IP address.
211	/// </summary>
212	internal BigInteger InternalNetwork
213	{
214	get
215	{	13,174,124✔
216	BigInteger uintNetwork = this.ipaddress & this.InternalNetmask;	13,174,124✔
217	return uintNetwork;	13,174,124✔
218	}	13,174,124✔
219	}
220
221	/// <summary>
222	/// Gets the netmask as a BigInteger representation based on the CIDR and address family.
223	/// </summary>
224	internal BigInteger InternalNetmask
225	{
226	get
227	{	13,309,344✔
228	return ToUint(this.cidr, this.family);	13,309,344✔
229	}	13,309,344✔
230	}
231	}

lduchosal / ipnetwork / 795

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