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

use log::debug;
use thiserror::*;
use std::io::Read;
use std::net::ToSocketAddrs;
use std::path::Path;

#[derive(Debug, Error)]
/// anyhow::Errors.
pub enum Error {
    #[error("Host not found")]
    HostNotFound,
    #[error("No home directory")]
    NoHome,
    #[error("{}", source)]
    Io {
        #[from]
        source: std::io::Error,
    },
}

mod proxy;
pub use proxy::*;

#[derive(Debug)]
pub struct Config {
    pub user: String,
    pub host_name: String,
    pub port: u16,
    pub identity_file: Option<String>,
    pub proxy_command: Option<String>,
    pub add_keys_to_agent: AddKeysToAgent,
}

impl Config {
    pub fn default(host_name: &str) -> Self {
        Config {
            user: whoami::username(),
            host_name: host_name.to_string(),
            port: 22,
            identity_file: None,
            proxy_command: None,
            add_keys_to_agent: AddKeysToAgent::default(),
        }
    }
}

impl Config {
    fn update_proxy_command(&mut self) {
        if let Some(ref mut prox) = self.proxy_command {
            *prox = prox.replace("%h", &self.host_name);
            *prox = prox.replace("%p", &format!("{}", self.port));
        }
    }

    pub async fn stream(&mut self) -> Result<Stream, std::io::Error> {
        self.update_proxy_command();
        if let Some(ref proxy_command) = self.proxy_command {
            let cmd: Vec<&str> = proxy_command.split(' ').collect();
            Stream::proxy_command(cmd[0], &cmd[1..]).await
        } else {
            Stream::tcp_connect(
                &(self.host_name.as_str(), self.port)
                    .to_socket_addrs()?
                    .next()
                    .unwrap(),
            )
            .await
        }
    }
}

pub fn parse_home(host: &str) -> Result<Config, Error> {
    let mut home = if let Some(home) = dirs_next::home_dir() {
        home
    } else {
        return Err(Error::NoHome);
    };
    home.push(".ssh");
    home.push("config");
    parse_path(&home, host)
}

pub fn parse_path<P: AsRef<Path>>(path: P, host: &str) -> Result<Config, Error> {
    let mut s = String::new();
    let mut b = std::fs::File::open(path)?;
    b.read_to_string(&mut s)?;
    parse(&s, host)
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum AddKeysToAgent {
    Yes,
    Confirm,
    Ask,
    No,
}

impl Default for AddKeysToAgent {
    fn default() -> Self {
        AddKeysToAgent::No
    }
}

pub fn parse(file: &str, host: &str) -> Result<Config, Error> {
    let mut config: Option<Config> = None;
    for line in file.lines() {
        let line = line.trim();
        if let Some(n) = line.find(' ') {
            let (key, value) = line.split_at(n);
            let lower = key.to_lowercase();
            if let Some(ref mut config) = config {
                match lower.as_str() {
                    "host" => break,
                    "user" => {
                        config.user.clear();
                        config.user.push_str(value.trim_start());
                    }
                    "hostname" => {
                        config.host_name.clear();
                        config.host_name.push_str(value.trim_start())
                    }
                    "port" => {
                        if let Ok(port) = value.trim_start().parse() {
                            config.port = port
                        }
                    }
                    "identityfile" => {
                        let id = value.trim_start();
                        if id.starts_with("~/") {
                            if let Some(mut home) = dirs_next::home_dir() {
                                home.push(id.split_at(2).1);
                                config.identity_file = Some(home.to_str().unwrap().to_string());
                            } else {
                                return Err(Error::NoHome);
                            }
                        } else {
                            config.identity_file = Some(id.to_string())
                        }
                    }
                    "proxycommand" => config.proxy_command = Some(value.trim_start().to_string()),
                    "addkeystoagent" => match value.to_lowercase().as_str() {
                        "yes" => config.add_keys_to_agent = AddKeysToAgent::Yes,
                        "confirm" => config.add_keys_to_agent = AddKeysToAgent::Confirm,
                        "ask" => config.add_keys_to_agent = AddKeysToAgent::Ask,
                        _ => config.add_keys_to_agent = AddKeysToAgent::No,
                    },
                    key => {
                        debug!("{:?}", key);
                    }
                }
            } else {
                match lower.as_str() {
                    "host" => {
                        if value.trim_start() == host {
                            let mut c = Config::default(host);
                            c.port = 22;
                            config = Some(c)
                        }
                    }
                    _ => {}
                }
            }
        }
    }
    if let Some(config) = config {
        Ok(config)
    } else {
        Err(Error::HostNotFound)
    }
}