#![allow(dead_code)]
#[cfg(feature = "log")]
use env_logger::Builder;
use getopts::{Matches, Options};
#[cfg(feature = "log")]
use log::{trace, Level, LevelFilter};
use std::env;
use std::fs::File;
use std::io::{self, Write};
use std::process;
use std::str::{self, FromStr};
use std::time::{SystemTime, UNIX_EPOCH};
#[cfg(feature = "phy-tuntap_interface")]
use smoltcp::phy::TunTapInterface;
use smoltcp::phy::{Device, FaultInjector, Medium, Tracer};
use smoltcp::phy::{PcapMode, PcapWriter};
use smoltcp::time::{Duration, Instant};
#[cfg(feature = "log")]
pub fn setup_logging_with_clock<F>(filter: &str, since_startup: F)
where
F: Fn() -> Instant + Send + Sync + 'static,
{
Builder::new()
.format(move |buf, record| {
let elapsed = since_startup();
let timestamp = format!("[{}]", elapsed);
if record.target().starts_with("smoltcp::") {
writeln!(
buf,
"\x1b[0m{} ({}): {}\x1b[0m",
timestamp,
record.target().replace("smoltcp::", ""),
record.args()
)
} else if record.level() == Level::Trace {
let message = format!("{}", record.args());
writeln!(
buf,
"\x1b[37m{} {}\x1b[0m",
timestamp,
message.replace("\n", "\n ")
)
} else {
writeln!(
buf,
"\x1b[32m{} ({}): {}\x1b[0m",
timestamp,
record.target(),
record.args()
)
}
})
.filter(None, LevelFilter::Trace)
.parse(filter)
.parse(&env::var("RUST_LOG").unwrap_or_else(|_| "".to_owned()))
.init();
}
#[cfg(feature = "log")]
pub fn setup_logging(filter: &str) {
setup_logging_with_clock(filter, Instant::now)
}
pub fn create_options() -> (Options, Vec<&'static str>) {
let mut opts = Options::new();
opts.optflag("h", "help", "print this help menu");
(opts, Vec::new())
}
pub fn parse_options(options: &Options, free: Vec<&str>) -> Matches {
match options.parse(env::args().skip(1)) {
Err(err) => {
println!("{}", err);
process::exit(1)
}
Ok(matches) => {
if matches.opt_present("h") || matches.free.len() != free.len() {
let brief = format!(
"Usage: {} [OPTION]... {}",
env::args().next().unwrap(),
free.join(" ")
);
print!("{}", options.usage(&brief));
process::exit(if matches.free.len() != free.len() {
1
} else {
0
})
}
matches
}
}
}
pub fn add_tuntap_options(opts: &mut Options, _free: &mut Vec<&str>) {
opts.optopt("", "tun", "TUN interface to use", "tun0");
opts.optopt("", "tap", "TAP interface to use", "tap0");
}
#[cfg(feature = "phy-tuntap_interface")]
pub fn parse_tuntap_options(matches: &mut Matches) -> TunTapInterface {
let tun = matches.opt_str("tun");
let tap = matches.opt_str("tap");
match (tun, tap) {
(Some(tun), None) => TunTapInterface::new(&tun, Medium::Ip).unwrap(),
(None, Some(tap)) => TunTapInterface::new(&tap, Medium::Ethernet).unwrap(),
_ => panic!("You must specify exactly one of --tun or --tap"),
}
}
pub fn add_middleware_options(opts: &mut Options, _free: &mut Vec<&str>) {
opts.optopt("", "pcap", "Write a packet capture file", "FILE");
opts.optopt(
"",
"drop-chance",
"Chance of dropping a packet (%)",
"CHANCE",
);
opts.optopt(
"",
"corrupt-chance",
"Chance of corrupting a packet (%)",
"CHANCE",
);
opts.optopt(
"",
"size-limit",
"Drop packets larger than given size (octets)",
"SIZE",
);
opts.optopt(
"",
"tx-rate-limit",
"Drop packets after transmit rate exceeds given limit \
(packets per interval)",
"RATE",
);
opts.optopt(
"",
"rx-rate-limit",
"Drop packets after transmit rate exceeds given limit \
(packets per interval)",
"RATE",
);
opts.optopt(
"",
"shaping-interval",
"Sets the interval for rate limiting (ms)",
"RATE",
);
}
pub fn parse_middleware_options<D>(
matches: &mut Matches,
device: D,
loopback: bool,
) -> FaultInjector<Tracer<PcapWriter<D, Box<dyn io::Write>>>>
where
D: for<'a> Device<'a>,
{
let drop_chance = matches
.opt_str("drop-chance")
.map(|s| u8::from_str(&s).unwrap())
.unwrap_or(0);
let corrupt_chance = matches
.opt_str("corrupt-chance")
.map(|s| u8::from_str(&s).unwrap())
.unwrap_or(0);
let size_limit = matches
.opt_str("size-limit")
.map(|s| usize::from_str(&s).unwrap())
.unwrap_or(0);
let tx_rate_limit = matches
.opt_str("tx-rate-limit")
.map(|s| u64::from_str(&s).unwrap())
.unwrap_or(0);
let rx_rate_limit = matches
.opt_str("rx-rate-limit")
.map(|s| u64::from_str(&s).unwrap())
.unwrap_or(0);
let shaping_interval = matches
.opt_str("shaping-interval")
.map(|s| u64::from_str(&s).unwrap())
.unwrap_or(0);
let pcap_writer: Box<dyn io::Write>;
if let Some(pcap_filename) = matches.opt_str("pcap") {
pcap_writer = Box::new(File::create(pcap_filename).expect("cannot open file"))
} else {
pcap_writer = Box::new(io::sink())
}
let seed = SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap()
.subsec_nanos();
let device = PcapWriter::new(
device,
pcap_writer,
if loopback {
PcapMode::TxOnly
} else {
PcapMode::Both
},
);
let device = Tracer::new(device, |_timestamp, _printer| {
#[cfg(feature = "log")]
trace!("{}", _printer);
});
let mut device = FaultInjector::new(device, seed);
device.set_drop_chance(drop_chance);
device.set_corrupt_chance(corrupt_chance);
device.set_max_packet_size(size_limit);
device.set_max_tx_rate(tx_rate_limit);
device.set_max_rx_rate(rx_rate_limit);
device.set_bucket_interval(Duration::from_millis(shaping_interval));
device
}