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

use crate::IphlpNetworkAdapterInfo;
use std::net::{Ipv4Addr, Ipv6Addr};
use windows::Win32::{
    Foundation::{SetLastError, ERROR_OBJECT_ALREADY_EXISTS, ERROR_SUCCESS, NO_ERROR},
    NetworkManagement::IpHelper::{
        CreateIpForwardEntry2, InitializeIpForwardEntry, MIB_IPFORWARD_ROW2,
    },
    Networking::WinSock::{
        NlroManual, AF_INET, AF_INET6, IN6_ADDR, IN6_ADDR_0, MIB_IPPROTO_NT_STATIC,
    },
};

impl IphlpNetworkAdapterInfo {
    /// Adds a default IPv4 gateway to the network interface.
    ///
    /// # Arguments
    ///
    /// * `address`: Default gateway IPv4 address
    ///
    /// # Returns
    ///
    /// * `Option<MIB_IPFORWARD_ROW2>`: Some(MIB_IPFORWARD_ROW2) on success, None on failure
    ///
    /// # Safety
    ///
    /// This function calls unsafe Windows API functions (`InitializeIpForwardEntry`, `SetLastError`, and
    /// `CreateIpForwardEntry2`). Make sure to handle errors and exceptions properly when using this function.
    pub fn add_default_gateway_ipv4(&self, address: Ipv4Addr) -> Option<MIB_IPFORWARD_ROW2> {
        let mut forward_row = MIB_IPFORWARD_ROW2::default();
        unsafe { InitializeIpForwardEntry(&mut forward_row) };

        forward_row.InterfaceIndex = self.if_index;
        forward_row.InterfaceLuid = self.luid.into();
        forward_row.DestinationPrefix.Prefix.si_family = AF_INET;
        forward_row.DestinationPrefix.Prefix.Ipv4.sin_family = AF_INET;
        forward_row.NextHop.si_family = AF_INET;
        forward_row.NextHop.Ipv4.sin_family = AF_INET;
        forward_row.NextHop.Ipv4.sin_addr.S_un.S_addr = u32::from_ne_bytes(address.octets());
        forward_row.SitePrefixLength = 0;
        forward_row.Metric = 1;
        forward_row.Protocol = MIB_IPPROTO_NT_STATIC;
        forward_row.Origin = NlroManual;

        unsafe { SetLastError(ERROR_SUCCESS) };

        let error_code = unsafe { CreateIpForwardEntry2(&forward_row) };

        if error_code == NO_ERROR || error_code == ERROR_OBJECT_ALREADY_EXISTS {
            Some(forward_row)
        } else {
            unsafe { SetLastError(error_code) };
            None
        }
    }

    /// Adds a default IPv6 gateway to the network interface.
    ///
    /// # Arguments
    ///
    /// * `address`: Default gateway IPv6 address
    ///
    /// # Returns
    ///
    /// * `Option<MIB_IPFORWARD_ROW2>`: Some(MIB_IPFORWARD_ROW2) on success, None on failure
    ///
    /// # Safety
    ///
    /// This function uses FFI to interact with the Windows API, specifically the `InitializeIpForwardEntry`,
    /// `CreateIpForwardEntry2`, and `SetLastError` functions. It is the caller's responsibility to ensure that
    /// the library containing these functions is properly loaded and the FFI definitions are correct.
    pub fn add_default_gateway_ipv6(&self, address: Ipv6Addr) -> Option<MIB_IPFORWARD_ROW2> {
        let mut forward_row = MIB_IPFORWARD_ROW2::default();
        unsafe { InitializeIpForwardEntry(&mut forward_row) };

        forward_row.InterfaceIndex = self.ipv6_if_index;
        forward_row.InterfaceLuid = self.luid.into();
        forward_row.DestinationPrefix.Prefix.si_family = AF_INET6;
        forward_row.DestinationPrefix.Prefix.Ipv6.sin6_family = AF_INET6;
        forward_row.NextHop.si_family = AF_INET6;
        forward_row.NextHop.Ipv6.sin6_family = AF_INET6;
        forward_row.NextHop.Ipv6.sin6_addr = IN6_ADDR {
            u: IN6_ADDR_0 {
                Byte: address.octets(),
            },
        };
        forward_row.SitePrefixLength = 0;
        forward_row.Metric = 1;
        forward_row.Protocol = MIB_IPPROTO_NT_STATIC;
        forward_row.Origin = NlroManual;

        unsafe { SetLastError(ERROR_SUCCESS) };

        let error_code = unsafe { CreateIpForwardEntry2(&forward_row) };

        if error_code == NO_ERROR || error_code == ERROR_OBJECT_ALREADY_EXISTS {
            Some(forward_row)
        } else {
            unsafe { SetLastError(error_code) };
            None
        }
    }

    /// Configures the network interface as a default IPv4 gateway with the specified metric.
    ///
    /// # Arguments
    ///
    /// * `metric`: Network metric (priority), defaults to 0
    ///
    /// # Returns
    ///
    /// * `Option<MIB_IPFORWARD_ROW2>`: Some(MIB_IPFORWARD_ROW2) on success, None on failure
    ///
    /// # Safety
    ///
    /// This function uses unsafe Windows API calls to initialize and create IP forward entries.
    /// The caller should ensure that the provided metric is a valid network metric and
    /// that the network interface is properly configured before calling this function.
    pub fn assign_default_gateway_ipv4(&self, metric: u32) -> Option<MIB_IPFORWARD_ROW2> {
        let mut forward_row = MIB_IPFORWARD_ROW2::default();
        unsafe { InitializeIpForwardEntry(&mut forward_row) };

        forward_row.InterfaceIndex = self.if_index;
        forward_row.InterfaceLuid = self.luid.into();
        forward_row.DestinationPrefix.Prefix.si_family = AF_INET;
        forward_row.DestinationPrefix.Prefix.Ipv4.sin_family = AF_INET;
        forward_row.NextHop.si_family = AF_INET;
        forward_row.NextHop.Ipv4.sin_family = AF_INET;
        forward_row.NextHop.Ipv4.sin_addr.S_un.S_addr = 0;
        forward_row.SitePrefixLength = 0;
        forward_row.Metric = metric;
        forward_row.Protocol = MIB_IPPROTO_NT_STATIC;
        forward_row.Origin = NlroManual;

        unsafe { SetLastError(ERROR_SUCCESS) };

        let error_code = unsafe { CreateIpForwardEntry2(&forward_row) };

        if error_code == NO_ERROR || error_code == ERROR_OBJECT_ALREADY_EXISTS {
            Some(forward_row)
        } else {
            unsafe { SetLastError(error_code) };
            None
        }
    }

    /// Configures the network interface as a default IPv6 gateway with the specified metric.
    ///
    /// # Arguments
    ///
    /// * `metric`: Network metric (priority), defaults to 0
    ///
    /// # Returns
    ///
    /// * `Option<MIB_IPFORWARD_ROW2>`: Some(MIB_IPFORWARD_ROW2) on success, None on failure
    ///
    /// # Safety
    ///
    /// This function uses unsafe Windows API calls to initialize and create IP forward entries.
    /// The caller should ensure that the provided metric is a valid network metric and
    /// that the network interface is properly configured before calling this function.
    pub fn assign_default_gateway_ipv6(&self, metric: u32) -> Option<MIB_IPFORWARD_ROW2> {
        let mut forward_row = MIB_IPFORWARD_ROW2::default();
        unsafe { InitializeIpForwardEntry(&mut forward_row) };

        forward_row.InterfaceIndex = self.ipv6_if_index;
        forward_row.InterfaceLuid = self.luid.into();
        forward_row.DestinationPrefix.Prefix.si_family = AF_INET6;
        forward_row.DestinationPrefix.Prefix.Ipv6.sin6_family = AF_INET6;
        forward_row.NextHop.si_family = AF_INET6;
        forward_row.NextHop.Ipv6.sin6_family = AF_INET6;
        forward_row.NextHop.Ipv6.sin6_addr = IN6_ADDR::default();
        forward_row.SitePrefixLength = 0;
        forward_row.Metric = metric;
        forward_row.Protocol = MIB_IPPROTO_NT_STATIC;
        forward_row.Origin = NlroManual;

        let error_code = unsafe { CreateIpForwardEntry2(&forward_row) };

        if error_code == NO_ERROR || error_code == ERROR_OBJECT_ALREADY_EXISTS {
            Some(forward_row)
        } else {
            unsafe { SetLastError(error_code) };
            None
        }
    }
}