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Cargo.lock

reviewed

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Cargo.toml

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··· 3 3 version = "0.1.0" 4 4 edition = "2024" 5 5 6 6 + [features] 7 7 + default = [] 8 8 + https = ["reqwless/embedded-tls", "dep:der"] 9 9 + 6 10 [dependencies] 7 11 embedded-io = { version = "0.7", default-features = false } 8 12 embedded-io-async = { version = "0.7", default-features = false } 9 13 embedded-nal-async = { version = "0.9", default-features = false } 14 14 + der = { version = "0.8", default-features = false, features = ["derive", "oid", "time", "heapless"], optional = true } 10 15 libc = { version = "0.2", default-features = false } 11 16 reqwless = { version = "0.14", default-features = false } 12 17

+8 -1

README.md

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··· 10 10 11 11 This prints the HTTP response body to stdout. 12 12 13 13 + To enable baseline HTTPS support: 14 14 + 15 15 + ```bash 16 16 + cargo run --features https -- https://example.com 17 17 + ``` 18 18 + 13 19 ## Notes 14 20 15 21 - `no_std` + `no_main` binary using Linux libc syscalls 16 16 - - Uses `reqwless` with `default-features = false` (HTTP only) 22 22 + - Uses `reqwless` with `default-features = false` 23 23 + - HTTPS is optional via `--features https` and currently uses `TlsVerify::None` (insecure baseline) 17 24 - Uses fixed-size stack buffers for request/response and output chunks 18 25 - Performs best-effort low-allocation operation (no `String`/`Vec` in app code)

+56 -1

src/main.rs

reviewed

··· 16 16 use embedded_nal_async::{AddrType, Dns, TcpConnect}; 17 17 use reqwless::TryBufRead; 18 18 use reqwless::client::HttpClient; 19 19 + #[cfg(feature = "https")] 20 20 + use reqwless::client::{TlsConfig, TlsVerify}; 19 21 use reqwless::request::Method; 20 22 21 23 const EXIT_OK: c_int = 0; ··· 23 25 const EXIT_FAILURE: c_int = 1; 24 26 25 27 const DNS_HOST_MAX: usize = 255; 28 28 + #[cfg(feature = "https")] 29 29 + const TLS_BUFFER_SIZE: usize = 16 * 1024; 30 30 + #[cfg(feature = "https")] 31 31 + const TLS_DUMMY_SEED: u64 = 0xA17E_5EED_D00D_F00D; 26 32 27 33 struct LinuxTcp; 28 34 ··· 35 41 #[derive(Debug)] 36 42 enum AppError { 37 43 MissingUrl, 44 44 + #[cfg(not(feature = "https"))] 45 45 + HttpsFeatureDisabled, 38 46 InvalidUtf8, 39 47 UrlTooLong, 40 48 NulInHost, ··· 48 56 fn kind(&self) -> ErrorKind { 49 57 match self { 50 58 Self::MissingUrl => ErrorKind::InvalidInput, 59 59 + #[cfg(not(feature = "https"))] 60 60 + Self::HttpsFeatureDisabled => ErrorKind::Unsupported, 51 61 Self::InvalidUtf8 => ErrorKind::InvalidData, 52 62 Self::UrlTooLong => ErrorKind::InvalidInput, 53 63 Self::NulInHost => ErrorKind::InvalidInput, ··· 77 87 fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { 78 88 let message = match self { 79 89 Self::MissingUrl => "missing url argument", 90 90 + #[cfg(not(feature = "https"))] 91 91 + Self::HttpsFeatureDisabled => "https support not enabled", 80 92 Self::InvalidUtf8 => "url argument must be valid utf-8", 81 93 Self::UrlTooLong => "hostname is too long", 82 94 Self::NulInHost => "hostname contains NUL byte", ··· 189 201 let url = match read_url_argument(argc, argv) { 190 202 Ok(url) => url, 191 203 Err(AppError::MissingUrl) => { 192 192 - write_stderr(b"usage: reqwless-linux <http://url>\n"); 204 204 + print_usage(); 193 205 return EXIT_USAGE; 194 206 } 195 207 Err(error) => { ··· 208 220 } 209 221 210 222 async fn download_to_stdout(url: &str) -> Result<(), AppError> { 223 223 + if url.starts_with("https://") { 224 224 + return download_https_to_stdout(url).await; 225 225 + } 226 226 + 227 227 + download_http_to_stdout(url).await 228 228 + } 229 229 + 230 230 + async fn download_http_to_stdout(url: &str) -> Result<(), AppError> { 211 231 let tcp = LinuxTcp; 212 232 let dns = LinuxDns; 213 233 let mut client = HttpClient::new(&tcp, &dns); 234 234 + stream_get_to_stdout(&mut client, url).await 235 235 + } 236 236 + 237 237 + #[cfg(feature = "https")] 238 238 + async fn download_https_to_stdout(url: &str) -> Result<(), AppError> { 239 239 + let tcp = LinuxTcp; 240 240 + let dns = LinuxDns; 241 241 + let mut tls_read_buf = [0_u8; TLS_BUFFER_SIZE]; 242 242 + let mut tls_write_buf = [0_u8; TLS_BUFFER_SIZE]; 243 243 + let mut client = HttpClient::new_with_tls( 244 244 + &tcp, 245 245 + &dns, 246 246 + TlsConfig::new(TLS_DUMMY_SEED, &mut tls_read_buf, &mut tls_write_buf, TlsVerify::None), 247 247 + ); 248 248 + stream_get_to_stdout(&mut client, url).await 249 249 + } 250 250 + 251 251 + #[cfg(not(feature = "https"))] 252 252 + async fn download_https_to_stdout(_url: &str) -> Result<(), AppError> { 253 253 + Err(AppError::HttpsFeatureDisabled) 254 254 + } 255 255 + 256 256 + async fn stream_get_to_stdout(client: &mut HttpClient<'_, LinuxTcp, LinuxDns>, url: &str) -> Result<(), AppError> { 214 257 let mut rx_buf = [0_u8; 8192]; 215 258 216 259 let mut request = client.request(Method::GET, url).await.map_err(AppError::Http)?; ··· 227 270 } 228 271 229 272 Ok(()) 273 273 + } 274 274 + 275 275 + fn print_usage() { 276 276 + #[cfg(feature = "https")] 277 277 + write_stderr(b"usage: reqwless-linux <http://url|https://url>\n"); 278 278 + 279 279 + #[cfg(not(feature = "https"))] 280 280 + write_stderr(b"usage: reqwless-linux <http://url>\n"); 230 281 } 231 282 232 283 fn read_url_argument<'a>(argc: c_int, argv: *const *const c_char) -> Result<&'a str, AppError> { ··· 390 441 fn report_error(error: AppError) { 391 442 match error { 392 443 AppError::MissingUrl => write_stderr(b"missing url argument\n"), 444 444 + #[cfg(not(feature = "https"))] 445 445 + AppError::HttpsFeatureDisabled => write_stderr(b"https url requires --features https\n"), 393 446 AppError::InvalidUtf8 => write_stderr(b"url argument must be valid utf-8\n"), 394 447 AppError::UrlTooLong => write_stderr(b"hostname is too long\n"), 395 448 AppError::NulInHost => write_stderr(b"hostname contains NUL byte\n"), ··· 399 452 AppError::Http(reqwless::Error::InvalidUrl(_)) => write_stderr(b"invalid url\n"), 400 453 AppError::Http(reqwless::Error::Dns) => write_stderr(b"http dns error\n"), 401 454 AppError::Http(reqwless::Error::BufferTooSmall) => write_stderr(b"response buffer too small\n"), 455 455 + #[cfg(feature = "https")] 456 456 + AppError::Http(reqwless::Error::Tls(_)) => write_stderr(b"tls handshake failed\n"), 402 457 AppError::Http(_) => write_stderr(b"http request failed\n"), 403 458 } 404 459 }