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extern crate libc;
use std::ptr::null;
use std::ptr::null_mut;
use std::ffi::CString;
mod ffi {
use libc::c_void;
use libc::c_char;
pub enum DNSService {}
pub type DNSServiceRef = *mut DNSService;
#[repr(i32)]
#[allow(dead_code)]
#[derive(Copy,Clone,Debug,PartialEq,Eq)]
pub enum DNSServiceErrorType {
NoError = 0,
Unknown = -65537,
NoSuchName = -65538,
NoMemory = -65539,
BadParam = -65540,
BadReference = -65541,
BadState = -65542,
BadFlags = -65543,
Unsupported = -65544,
NotInitialized = -65545,
AlreadyRegistered = -65547,
NameConflict = -65548,
Invalid = -65549,
Firewall = -65550,
Incompatible = -65551,
BadInterfaceIndex = -65552,
Refused = -65553,
NoSuchRecord = -65554,
NoAuth = -65555,
NoSuchKey = -65556,
NATTraversal = -65557,
DoubleNAT = -65558,
BadTime = -65559,
BadSig = -65560,
BadKey = -65561,
Transient = -65562,
ServiceNotRunning = -65563,
NATPortMappingUnsupported = -65564,
NATPortMappingDisabled = -65565,
NoRouter = -65566,
PollingMode = -65567,
Timeout = -65568,
}
pub type DNSServiceFlags = u32;
pub type DNSServiceRegisterReply = Option<extern "C" fn(DNSServiceRef,
DNSServiceFlags,
DNSServiceErrorType,
*const c_char,
*const c_char,
*const c_char,
*mut c_void)
>;
extern "C" {
pub fn DNSServiceRegister(sdRef: *mut DNSServiceRef,
flags: DNSServiceFlags,
interfaceIndex: u32,
name: *const c_char,
regtype: *const c_char,
domain: *const c_char,
host: *const c_char,
port: u16,
txtLen: u16,
txtRecord: *const u8,
callBack: DNSServiceRegisterReply,
context: *mut c_void)
-> DNSServiceErrorType;
pub fn DNSServiceRefDeallocate(sdRef: DNSServiceRef);
}
}
#[derive(Debug)]
pub struct DNSService {
sd_ref: ffi::DNSServiceRef,
}
#[derive(Debug)]
pub struct DNSError(ffi::DNSServiceErrorType);
impl std::fmt::Display for DNSError {
fn fmt(&self, format: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
write!(format, "DNS-SD Error: {:?}", self.0)
}
}
impl std::error::Error for DNSError {
fn description(&self) -> &str {
"DNS-SD Error"
}
}
impl DNSService {
pub fn register(name: Option<&str>,
regtype: &str,
domain: Option<&str>,
host: Option<&str>,
port: u16,
txt: &[&str])
-> std::result::Result<DNSService, DNSError> {
let mut sd_ref: ffi::DNSServiceRef = null_mut();
let txt_data: Vec<u8> = txt.into_iter()
.flat_map(|value| {
std::iter::once(value.len() as u8).chain(value.bytes())
})
.collect();
let name = name.map(|s| CString::new(s).unwrap());
let regtype = CString::new(regtype).unwrap();
let domain = domain.map(|s| CString::new(s).unwrap());
let host = host.map(|s| CString::new(s).unwrap());
let err = unsafe {
ffi::DNSServiceRegister(&mut sd_ref as *mut _,
0,
0,
name.as_ref().map_or(null(), |s| s.as_ptr()),
regtype.as_ptr(),
domain.as_ref().map_or(null(), |s| s.as_ptr()),
host.as_ref().map_or(null(), |s| s.as_ptr()),
port.to_be(),
txt_data.len() as u16,
if txt_data.is_empty() {
null()
} else {
txt_data.as_ptr()
},
None,
null_mut())
};
drop(name);
drop(regtype);
drop(domain);
drop(host);
drop(txt_data);
if err == ffi::DNSServiceErrorType::NoError {
Ok(DNSService { sd_ref: sd_ref })
} else {
Err(DNSError(err))
}
}
}
impl Drop for DNSService {
fn drop(&mut self) {
unsafe {
ffi::DNSServiceRefDeallocate(self.sd_ref);
}
}
}