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use std::ffi::{CStr, CString};
use crate::{Error, BorrowedPacket, DataLink, traits, Stats};
use super::dll::{PCapHandle, PCapDll, PCapPacketHeader};
use super::dll::helpers::PCapErrBuf;
use super::structs::PCapStat;
use libc::{ c_int};
use std::mem::{uninitialized, transmute};
use crate::utils::cstr_to_string;
use crate::pcap_common::helpers::{borrowed_packet_from_header, on_received_packet_static, on_received_packet_dynamic};
use crate::pcap_common::constants::{SUCCESS, PCAP_ERROR_BREAK};
pub struct Interface<'a> {
handle: * const PCapHandle,
dll: & 'a PCapDll,
datalink: DataLink
}
unsafe impl<'a> Sync for Interface<'a> {}
unsafe impl<'a> Send for Interface<'a> {}
impl<'a> Interface<'a> {
pub fn new(name: &str, dll: &'a PCapDll) ->Result<Self, Error> {
let name = CString::new(name)?;
let mut errbuf = PCapErrBuf::new();
let handle = unsafe { dll.pcap_open_live(
name.as_ptr(),
65536,
8,
1000,
errbuf.buffer()
)};
if handle.is_null() {
return Err(Error::OpeningInterface(errbuf.as_string()))
}
let datalink = match unsafe{dll.pcap_datalink(handle)}{
1 => DataLink::Ethernet,
12 => DataLink::RawIp,
_=> DataLink::Other
};
Ok(Interface {
dll,
handle,
datalink
})
}
fn last_error(&self) -> Error {
let cerr = unsafe{self.dll.pcap_geterr(self.handle)};
Error::LibraryError(cstr_to_string(cerr))
}
}
impl<'a> Drop for Interface<'a> {
fn drop(&mut self) {
unsafe { self.dll.pcap_close(self.handle) }
}
}
impl<'a> traits::DynamicInterface<'a> for Interface<'a> {
fn send(&self, packet: &[u8]) -> Result<(), Error> {
if unsafe {self.dll.pcap_sendpacket(self.handle, packet.as_ptr(), packet.len() as c_int)} == SUCCESS {
Ok(())
} else {
let txt = unsafe {CStr::from_ptr(self.dll.pcap_geterr(self.handle))}.to_string_lossy().into_owned();
Err(Error::SendingPacket(txt))
}
}
fn receive(& mut self) -> Result<BorrowedPacket, Error>{
let mut header: PCapPacketHeader = unsafe {uninitialized()};
let data = unsafe { self.dll.pcap_next(self.handle, &mut header)};
if data.is_null() {
Err(Error::ReceivingPacket("Unknown error when obtaining packet".into()))
} else {
Ok(borrowed_packet_from_header(& header, data))
}
}
fn flush(&self) {
}
fn data_link(&self) -> DataLink {
self.datalink
}
fn stats(&self) -> Result<Stats, Error> {
let mut stats: PCapStat = unsafe{uninitialized()};
if SUCCESS == unsafe{self.dll.pcap_stats(self.handle, &mut stats)}{
Ok(Stats{
received: stats.ps_recv as u64,
dropped: (stats.ps_drop + stats.ps_ifdrop) as u64
})
} else {
Err(self.last_error())
}
}
fn break_loop(& self) {
unsafe{self.dll.pcap_breakloop(self.handle)}
}
fn loop_infinite_dyn(&self, callback: & dyn FnMut(&BorrowedPacket)) -> Result<(), Error> {
let result = unsafe { self.dll.pcap_loop(self.handle, -1, on_received_packet_dynamic, transmute(&callback)) };
if result == SUCCESS || result == PCAP_ERROR_BREAK {
Ok(())
} else {
Err(self.last_error())
}
}
}
impl<'a> traits::StaticInterface<'a> for Interface<'a> {
fn loop_infinite<F>(& self, callback: F) -> Result<(), Error> where F: FnMut(&BorrowedPacket) {
let result = unsafe { self.dll.pcap_loop(self.handle, -1, on_received_packet_static::<F>, transmute(&callback)) };
if result == SUCCESS || result == PCAP_ERROR_BREAK {
Ok(())
} else {
Err(self.last_error())
}
}
}