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

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License..

use super::*;
use alloc::vec::Vec;
use core::convert::{From, TryFrom};
use core::mem;
use sgx_types::marker::ContiguousMemory;

pub unsafe fn getaddrinfo(
    node: Option<&CStr>,
    service: Option<&CStr>,
    hints: Option<AddrInfoHints>,
) -> OCallResult<Vec<AddrInfo>> {
    let mut result: c_int = 0;
    let mut error: c_int = 0;

    const ADDRINFO_MAX_COUNT: usize = 32;

    let addrinfo: addr_info = mem::zeroed();
    let mut addrinfo_vec = vec![addrinfo; ADDRINFO_MAX_COUNT];

    let in_count = ADDRINFO_MAX_COUNT;
    let mut out_count = 0_usize;

    let node_ptr = node.map(|n| n.as_ptr()).unwrap_or(ptr::null());
    let service_ptr = service.map(|s| s.as_ptr()).unwrap_or(ptr::null());

    let hints = hints.map(|h| h.to_addrinfo());
    let hints_ptr = hints
        .as_ref()
        .map(|h| h as *const addrinfo)
        .unwrap_or(ptr::null());

    let status = u_getaddrinfo_ocall(
        &mut result as *mut c_int,
        &mut error as *mut c_int,
        node_ptr,
        service_ptr,
        hints_ptr,
        addrinfo_vec.as_mut_ptr(),
        in_count,
        &mut out_count as *mut size_t,
    );

    ensure!(status.is_success(), esgx!(status));
    match result {
        0 => {}
        EAI_SYSTEM => return Err(eos!(error)),
        1 => return Err(ecust!("Untrusted side error")),
        e => return Err(egai!(e)),
    };

    ensure!(result == 0, ecust!("Unkonwn error"));
    ensure!(out_count <= in_count, ecust!("Malformed out_count"));

    let mut addr_vec = Vec::<AddrInfo>::with_capacity(out_count);
    for addr in addrinfo_vec.into_iter().take(out_count) {
        addr_vec.push(AddrInfo::try_from(addr)?);
    }

    Ok(addr_vec)
}

#[derive(Clone, Copy, Debug)]
pub struct AddrInfoHints {
    pub flags: i32,
    pub family: i32,
    pub socktype: i32,
    pub protocol: i32,
}

impl AddrInfoHints {
    fn to_addrinfo(self) -> addrinfo {
        let mut addrinfo: addrinfo = unsafe { mem::zeroed() };
        addrinfo.ai_flags = self.flags;
        addrinfo.ai_family = self.family;
        addrinfo.ai_socktype = self.socktype;
        addrinfo.ai_protocol = self.protocol;
        addrinfo
    }

    #[allow(dead_code)]
    fn to_addr_info(self) -> addr_info {
        let mut addrinfo: addr_info = unsafe { mem::zeroed() };
        addrinfo.ai_flags = self.flags;
        addrinfo.ai_family = self.family;
        addrinfo.ai_socktype = self.socktype;
        addrinfo.ai_protocol = self.protocol;
        addrinfo
    }
}

impl From<addrinfo> for AddrInfoHints {
    fn from(addrinfo: addrinfo) -> AddrInfoHints {
        AddrInfoHints {
            flags: addrinfo.ai_flags,
            family: addrinfo.ai_family,
            socktype: addrinfo.ai_socktype,
            protocol: addrinfo.ai_protocol,
        }
    }
}

impl From<addr_info> for AddrInfoHints {
    fn from(addrinfo: addr_info) -> AddrInfoHints {
        AddrInfoHints {
            flags: addrinfo.ai_flags,
            family: addrinfo.ai_family,
            socktype: addrinfo.ai_socktype,
            protocol: addrinfo.ai_protocol,
        }
    }
}

impl Default for AddrInfoHints {
    fn default() -> Self {
        AddrInfoHints {
            flags: 0,
            family: AF_UNSPEC,
            socktype: 0,
            protocol: 0,
        }
    }
}

unsafe impl ContiguousMemory for AddrInfoHints {}

#[derive(Clone, Copy)]
pub struct AddrInfo {
    pub flags: i32,
    pub family: i32,
    pub socktype: i32,
    pub protocol: i32,
    pub addr: SockAddr,
}

unsafe impl ContiguousMemory for AddrInfo {}

impl TryFrom<addr_info> for AddrInfo {
    type Error = OCallError;
    fn try_from(addrinfo: addr_info) -> Result<Self, Self::Error> {
        ensure!(
            addrinfo.ai_family == addrinfo.ai_addr.ss_family as i32,
            ecust!("Unsupported family info")
        );

        Ok(AddrInfo {
            flags: addrinfo.ai_flags,
            family: addrinfo.ai_family,
            socktype: addrinfo.ai_socktype,
            protocol: addrinfo.ai_protocol,
            addr: match addrinfo.ai_addr.ss_family as i32 {
                AF_INET | AF_INET6 => unsafe {
                    SockAddr::try_from_storage(addrinfo.ai_addr, addrinfo.ai_addrlen)?
                },
                _ => return Err(ecust!("Unsupported family info")),
            },
        })
    }
}