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use std::kinds::marker;
use std::mem;
use std::raw as stdraw;
use std::str;
use {raw, Session, Error};
/// A structure representing a connection to an SSH agent.
///
/// Agents can be used to authenticate a session.
pub struct Agent<'sess> {
raw: *mut raw::LIBSSH2_AGENT,
sess: &'sess Session,
marker: marker::NoSync,
}
/// An iterator over the identities found in an SSH agent.
pub struct Identities<'agent> {
prev: *mut raw::libssh2_agent_publickey,
agent: &'agent Agent<'agent>,
}
/// A public key which is extracted from an SSH agent.
pub struct PublicKey<'agent> {
raw: *mut raw::libssh2_agent_publickey,
marker1: marker::NoSync,
marker2: marker::NoSend,
marker3: marker::ContravariantLifetime<'agent>,
marker4: marker::NoCopy,
}
impl<'sess> Agent<'sess> {
/// Wraps a raw pointer in a new Agent structure tied to the lifetime of the
/// given session.
///
/// This consumes ownership of `raw`.
pub unsafe fn from_raw(sess: &Session,
raw: *mut raw::LIBSSH2_AGENT) -> Agent {
Agent {
raw: raw,
sess: sess,
marker: marker::NoSync,
}
}
/// Connect to an ssh-agent running on the system.
pub fn connect(&mut self) -> Result<(), Error> {
unsafe { self.sess.rc(raw::libssh2_agent_connect(self.raw)) }
}
/// Close a connection to an ssh-agent.
pub fn disconnect(&mut self) -> Result<(), Error> {
unsafe { self.sess.rc(raw::libssh2_agent_disconnect(self.raw)) }
}
/// Request an ssh-agent to list of public keys, and stores them in the
/// internal collection of the handle.
///
/// Call `identities` to get the public keys.
pub fn list_identities(&mut self) -> Result<(), Error> {
unsafe { self.sess.rc(raw::libssh2_agent_list_identities(self.raw)) }
}
/// Get an iterator over the identities of this agent.
pub fn identities(&self) -> Identities {
Identities { prev: 0 as *mut _, agent: self }
}
/// Attempt public key authentication with the help of ssh-agent.
pub fn userauth(&self, username: &str, identity: &PublicKey)
-> Result<(), Error>{
let username = username.to_c_str();
unsafe {
self.sess.rc(raw::libssh2_agent_userauth(self.raw,
username.as_ptr(),
identity.raw))
}
}
}
#[unsafe_destructor]
impl<'a> Drop for Agent<'a> {
fn drop(&mut self) {
unsafe { raw::libssh2_agent_free(self.raw) }
}
}
impl<'agent> Iterator<Result<PublicKey<'agent>, Error>> for Identities<'agent> {
fn next(&mut self) -> Option<Result<PublicKey<'agent>, Error>> {
unsafe {
let mut next = 0 as *mut _;
match raw::libssh2_agent_get_identity(self.agent.raw,
&mut next,
self.prev) {
0 => { self.prev = next; Some(Ok(PublicKey::from_raw(next))) }
1 => None,
rc => Some(Err(self.agent.sess.rc(rc).err().unwrap())),
}
}
}
}
impl<'agent> PublicKey<'agent> {
/// Creates a new public key from its raw counterpart.
///
/// Unsafe because the validity of `raw` cannot be guaranteed and there are
/// no restrictions on the lifetime returned.
pub unsafe fn from_raw(raw: *mut raw::libssh2_agent_publickey)
-> PublicKey<'agent> {
PublicKey {
raw: raw,
marker1: marker::NoSync,
marker2: marker::NoSend,
marker3: marker::ContravariantLifetime,
marker4: marker::NoCopy,
}
}
/// Return the data of this public key.
pub fn blob(&self) -> &[u8] {
unsafe {
mem::transmute(stdraw::Slice {
data: (*self.raw).blob as *const u8,
len: (*self.raw).blob_len as uint,
})
}
}
/// Returns the comment in a printable format
pub fn comment(&self) -> &str {
unsafe {
str::from_utf8(::opt_bytes(self, (*self.raw).comment).unwrap())
.unwrap()
}
}
/// Gain access to the underlying raw pointer
pub fn raw(&self) -> *mut raw::libssh2_agent_publickey { self.raw }
}
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