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#![deny(warnings)]
extern crate users;
use std::string::String;
use std::sync::{Mutex, Arc};
use std::path::{PathBuf, Path};
use std::io::{self,Write};
use std::fs;
use super::errors::*;
use super::Process;
use super::ProcessFileContext;
use super::Thread;
use super::ThreadFileContext;
use super::ThreadState;
use super::protocol;
use super::protocol::request;
use super::protocol::response;
const DEFAULT_UDI_ROOT_DIR: &'static str = "/tmp/udi";
const DEFAULT_UDI_RT_LIB_NAME: &'static str = "libudirt.so";
const UDI_ROOT_DIR_ENV: &'static str = "UDI_ROOT_DIR";
const REQUEST_FILE_NAME: &'static str = "request";
const RESPONSE_FILE_NAME: &'static str = "response";
const EVENTS_FILE_NAME: &'static str = "events";
#[derive(Debug)]
pub struct ProcessConfig {
root_dir: Option<String>,
rt_lib_path: Option<String>
}
impl ProcessConfig {
pub fn new(root_dir: Option<String>,
rt_lib_path: Option<String>) -> ProcessConfig {
ProcessConfig{
root_dir,
rt_lib_path
}
}
}
pub fn create_process(executable: &str,
argv: &Vec<String>,
envp: &Vec<String>,
config: &ProcessConfig) -> Result<Arc<Mutex<Process>>> {
let base_root_dir = config.root_dir.clone().unwrap_or(DEFAULT_UDI_ROOT_DIR.to_owned());
let rt_lib_path = config.rt_lib_path.clone().unwrap_or(DEFAULT_UDI_RT_LIB_NAME.to_owned());
let root_dir = create_root_udi_filesystem(&base_root_dir)?;
let mut child = launch_process(executable,
argv,
envp,
&root_dir,
&rt_lib_path)?;
let pid = child.id();
let mut root_dir_buf = PathBuf::from(&root_dir);
root_dir_buf.push(pid.to_string());
let process = initialize_process(&mut child, (*root_dir_buf.to_string_lossy()).to_owned())?;
Ok(Arc::new(Mutex::new(process)))
}
fn initialize_process(child: &mut ::std::process::Child, root_dir: String)
-> Result<Process> {
let pid = child.id();
let mut request_path_buf = PathBuf::from(&root_dir);
request_path_buf.push(REQUEST_FILE_NAME);
let request_path = request_path_buf.as_path();
let mut response_path_buf = PathBuf::from(&root_dir);
response_path_buf.push(RESPONSE_FILE_NAME);
let response_path = response_path_buf.as_path();
let mut event_path_buf = PathBuf::from(&root_dir);
event_path_buf.push(EVENTS_FILE_NAME);
let event_path = event_path_buf.as_path();
let mut event_file_exists = false;
while !event_file_exists {
match child.try_wait()? {
Some(status) => {
let msg = format!("Process failed to initialize, exited with status: {}", status);
return Err(ErrorKind::Library(msg).into());
},
None => {
}
};
match fs::metadata(event_path) {
Ok(_) => {
event_file_exists = true;
},
Err(e) => match e.kind() {
io::ErrorKind::NotFound => {},
_ => return Err(::std::convert::From::from(e))
}
};
};
let mut request_file = fs::OpenOptions::new().read(false)
.create(false)
.write(true)
.open(request_path)?;
request_file.write_all(&protocol::request::serialize(&request::Init::new())?)?;
let mut response_file = fs::File::open(response_path)?;
let events_file = fs::File::open(event_path)?;
let init: response::Init = protocol::response::read(&mut response_file)?;
let version = determine_protocol(&init)?;
let mut process = Process {
pid: pid,
file_context: Some(ProcessFileContext{ request_file, response_file, events_file }),
architecture: init.arch,
protocol_version: version,
multithread_capable: init.mt,
running: false,
terminating: false,
user_data: None,
threads: vec![],
root_dir: root_dir,
};
initialize_thread(&mut process, init.tid)?;
Ok(process)
}
fn determine_protocol(init: &response::Init) -> Result<u32> {
if init.v != protocol::UDI_PROTOCOL_VERSION_1 {
let msg = format!("Debuggee expects unsupported protocol version: {}", init.v);
return Err(ErrorKind::Library(msg).into());
}
Ok(init.v)
}
pub fn initialize_thread(process: &mut Process, tid: u64) -> Result<()> {
let mut request_path_buf = PathBuf::from(&process.root_dir);
request_path_buf.push(format!("{:016x}", tid));
request_path_buf.push(REQUEST_FILE_NAME);
let request_path = request_path_buf.as_path();
let mut response_path_buf = PathBuf::from(&process.root_dir);
response_path_buf.push(format!("{:016x}", tid));
response_path_buf.push(RESPONSE_FILE_NAME);
let response_path = response_path_buf.as_path();
let mut request_file = fs::OpenOptions::new().read(false)
.create(false)
.write(true)
.open(request_path)?;
request_file.write_all(&protocol::request::serialize(&request::Init::new())?)?;
let mut response_file = fs::File::open(response_path)?;
protocol::response::read::<response::Init, _>(&mut response_file)?;
let thr = Thread {
initial: process.threads.len() == 0,
tid: tid,
file_context: Some(ThreadFileContext{ request_file, response_file }),
single_step: false,
state: ThreadState::Running,
architecture: process.architecture,
user_data: None
};
process.threads.push(Arc::new(Mutex::new(thr)));
Ok(())
}
fn launch_process(executable: &str,
argv: &Vec<String>,
envp: &Vec<String>,
root_dir: &str,
rt_lib_path: &str) -> Result<::std::process::Child> {
let mut command = ::std::process::Command::new(executable);
let env = create_environment(envp,
root_dir,
rt_lib_path);
for entry in env {
command.env(entry.0, entry.1);
}
for entry in argv {
command.arg(entry);
}
let child = command.spawn()?;
Ok(child)
}
fn create_root_udi_filesystem(root_dir: &String) -> Result<String> {
mkdir_ignore_exists(Path::new(root_dir))?;
let user = users::get_current_username()
.ok_or(Error::from_kind(ErrorKind::Library("Failed to retrieve username".to_owned())))?;
let mut user_dir_path = PathBuf::from(root_dir);
user_dir_path.push(user);
mkdir_ignore_exists(user_dir_path.as_path())?;
if let Some(user_dir_path_str) = user_dir_path.to_str() {
Ok(user_dir_path_str.to_owned())
} else {
Err(ErrorKind::Library("Invalid root UDI filesystem path".to_owned()).into())
}
}
fn mkdir_ignore_exists(dir: &Path) -> Result<()> {
match fs::create_dir(dir) {
Ok(_) => Ok(()),
Err(e) => match e.kind() {
io::ErrorKind::AlreadyExists => Ok(()),
_ => Err(::std::convert::From::from(e))
}
}
}
fn create_environment(envp: &Vec<String>,
root_dir: &str,
rt_lib_path: &str) -> Vec<(String, String)> {
let mut output;
if envp.len() == 0 {
output = vec![];
} else {
output = envp.iter().map(|s| {
let mut field_iter = s.split("=");
field_iter.next()
.map(|k| (k.to_owned(),
field_iter.fold(String::new(), |mut l, r| {
l.push_str(r);
l
})))
.unwrap_or((s.clone(), String::new()))
}).collect::<Vec<_>>();
}
let var_name = sys::get_dyn_linker_var_name();
let mut updated_var = false;
for item in &mut output {
let k = &item.0;
let v = &mut item.1;
if k == var_name {
v.push_str(":");
v.push_str(rt_lib_path);
updated_var = true;
}
}
if !updated_var {
output.push((var_name.to_owned(), rt_lib_path.to_owned()));
}
output.push((UDI_ROOT_DIR_ENV.to_owned(), root_dir.to_owned()));
sys::modify_env(&mut output);
output
}
#[cfg(target_os = "linux")]
mod sys {
pub fn get_dyn_linker_var_name() -> &'static str {
"LD_PRELOAD"
}
pub fn modify_env(_env: &mut Vec<(String, String)>) {
}
}
#[cfg(target_os = "macos")]
mod sys {
pub fn get_dyn_linker_var_name() -> &'static str {
"DYLD_INSERT_LIBRARIES"
}
pub fn modify_env(env: &mut Vec<(String, String)>) {
env.push(("DYLD_FORCE_FLAT_NAMESPACE".to_owned(), "1".to_owned()));
}
}