158 lines
4.4 KiB
Rust
158 lines
4.4 KiB
Rust
// TODO: this is literally a copy of examples/utils.rs, but without an allow dead code attribute.
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// The include logic does not allow having attributes in included files.
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use getopts::{Matches, Options};
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use std::env;
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use std::fs::File;
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use std::io;
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use std::io::Write;
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use std::process;
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use std::str::{self, FromStr};
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use std::time::{SystemTime, UNIX_EPOCH};
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use smoltcp::phy::{Device, FaultInjector, Tracer};
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use smoltcp::phy::{PcapMode, PcapWriter};
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use smoltcp::time::Duration;
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pub fn create_options() -> (Options, Vec<&'static str>) {
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let mut opts = Options::new();
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opts.optflag("h", "help", "print this help menu");
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(opts, Vec::new())
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}
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pub fn parse_options(options: &Options, free: Vec<&str>) -> Matches {
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match options.parse(env::args().skip(1)) {
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Err(err) => {
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println!("{}", err);
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process::exit(1)
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}
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Ok(matches) => {
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if matches.opt_present("h") || matches.free.len() != free.len() {
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let brief = format!(
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"Usage: {} [OPTION]... {}",
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env::args().nth(0).unwrap(),
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free.join(" ")
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);
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print!("{}", options.usage(&brief));
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process::exit(if matches.free.len() != free.len() {
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1
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} else {
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0
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})
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}
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matches
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}
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}
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}
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pub fn add_middleware_options(opts: &mut Options, _free: &mut Vec<&str>) {
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opts.optopt("", "pcap", "Write a packet capture file", "FILE");
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opts.optopt(
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"",
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"drop-chance",
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"Chance of dropping a packet (%)",
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"CHANCE",
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);
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opts.optopt(
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"",
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"corrupt-chance",
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"Chance of corrupting a packet (%)",
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"CHANCE",
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);
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opts.optopt(
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"",
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"size-limit",
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"Drop packets larger than given size (octets)",
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"SIZE",
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);
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opts.optopt(
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"",
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"tx-rate-limit",
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"Drop packets after transmit rate exceeds given limit \
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(packets per interval)",
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"RATE",
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);
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opts.optopt(
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"",
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"rx-rate-limit",
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"Drop packets after transmit rate exceeds given limit \
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(packets per interval)",
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"RATE",
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);
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opts.optopt(
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"",
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"shaping-interval",
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"Sets the interval for rate limiting (ms)",
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"RATE",
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);
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}
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pub fn parse_middleware_options<D>(
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matches: &mut Matches,
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device: D,
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loopback: bool,
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) -> FaultInjector<Tracer<PcapWriter<D, Box<dyn Write>>>>
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where
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D: for<'a> Device<'a>,
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{
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let drop_chance = matches
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.opt_str("drop-chance")
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.map(|s| u8::from_str(&s).unwrap())
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.unwrap_or(0);
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let corrupt_chance = matches
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.opt_str("corrupt-chance")
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.map(|s| u8::from_str(&s).unwrap())
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.unwrap_or(0);
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let size_limit = matches
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.opt_str("size-limit")
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.map(|s| usize::from_str(&s).unwrap())
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.unwrap_or(0);
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let tx_rate_limit = matches
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.opt_str("tx-rate-limit")
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.map(|s| u64::from_str(&s).unwrap())
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.unwrap_or(0);
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let rx_rate_limit = matches
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.opt_str("rx-rate-limit")
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.map(|s| u64::from_str(&s).unwrap())
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.unwrap_or(0);
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let shaping_interval = matches
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.opt_str("shaping-interval")
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.map(|s| u64::from_str(&s).unwrap())
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.unwrap_or(0);
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let pcap_writer: Box<dyn io::Write>;
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if let Some(pcap_filename) = matches.opt_str("pcap") {
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pcap_writer = Box::new(File::create(pcap_filename).expect("cannot open file"))
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} else {
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pcap_writer = Box::new(io::sink())
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}
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let seed = SystemTime::now()
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.duration_since(UNIX_EPOCH)
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.unwrap()
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.subsec_nanos();
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let device = PcapWriter::new(
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device,
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pcap_writer,
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if loopback {
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PcapMode::TxOnly
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} else {
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PcapMode::Both
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},
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);
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let device = Tracer::new(device, |_timestamp, _printer| {
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#[cfg(feature = "log")]
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trace!("{}", _printer);
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});
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let mut device = FaultInjector::new(device, seed);
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device.set_drop_chance(drop_chance);
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device.set_corrupt_chance(corrupt_chance);
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device.set_max_packet_size(size_limit);
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device.set_max_tx_rate(tx_rate_limit);
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device.set_max_rx_rate(rx_rate_limit);
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device.set_bucket_interval(Duration::from_millis(shaping_interval));
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device
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}
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