summaryrefslogtreecommitdiffstats
path: root/third_party/rust/neqo-crypto/build.rs
blob: 2dd45437972d74ce7015e70372c037eee7f9a5a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use std::{
    collections::HashMap,
    env, fs,
    path::{Path, PathBuf},
    process::Command,
};

use bindgen::Builder;
use semver::{Version, VersionReq};
use serde_derive::Deserialize;

#[path = "src/min_version.rs"]
mod min_version;
use min_version::MINIMUM_NSS_VERSION;

const BINDINGS_DIR: &str = "bindings";
const BINDINGS_CONFIG: &str = "bindings.toml";

// This is the format of a single section of the configuration file.
#[derive(Deserialize)]
struct Bindings {
    /// types that are explicitly included
    #[serde(default)]
    types: Vec<String>,
    /// functions that are explicitly included
    #[serde(default)]
    functions: Vec<String>,
    /// variables (and `#define`s) that are explicitly included
    #[serde(default)]
    variables: Vec<String>,
    /// types that should be explicitly marked as opaque
    #[serde(default)]
    opaque: Vec<String>,
    /// enumerations that are turned into a module (without this, the enum is
    /// mapped using the default, which means that the individual values are
    /// formed with an underscore as <`enum_type`>_<`enum_value_name`>).
    #[serde(default)]
    enums: Vec<String>,

    /// Any item that is specifically excluded; if none of the types, functions,
    /// or variables fields are specified, everything defined will be mapped,
    /// so this can be used to limit that.
    #[serde(default)]
    exclude: Vec<String>,

    /// Whether the file is to be interpreted as C++
    #[serde(default)]
    cplusplus: bool,
}

fn is_debug() -> bool {
    // Check the build profile and not whether debug symbols are enabled (i.e.,
    // `env::var("DEBUG")`), because we enable those for benchmarking/profiling and still want
    // to build NSS in release mode.
    env::var("PROFILE").unwrap_or_default() == "debug"
}

// bindgen needs access to libclang.
// On windows, this doesn't just work, you have to set LIBCLANG_PATH.
// Rather than download the 400Mb+ files, like gecko does, let's just reuse their work.
fn setup_clang() {
    // If this isn't Windows, or we're in CI, then we don't need to do anything.
    if env::consts::OS != "windows" || env::var("GITHUB_WORKFLOW").unwrap() == "CI" {
        return;
    }
    println!("rerun-if-env-changed=LIBCLANG_PATH");
    println!("rerun-if-env-changed=MOZBUILD_STATE_PATH");
    if env::var("LIBCLANG_PATH").is_ok() {
        return;
    }
    let mozbuild_root = if let Ok(dir) = env::var("MOZBUILD_STATE_PATH") {
        PathBuf::from(dir.trim())
    } else {
        eprintln!("warning: Building without a gecko setup is not likely to work.");
        eprintln!("         A working libclang is needed to build neqo.");
        eprintln!("         Either LIBCLANG_PATH or MOZBUILD_STATE_PATH needs to be set.");
        eprintln!();
        eprintln!("    We recommend checking out https://github.com/mozilla/gecko-dev");
        eprintln!("    Then run `./mach bootstrap` which will retrieve clang.");
        eprintln!("    Make sure to export MOZBUILD_STATE_PATH when building.");
        return;
    };
    let libclang_dir = mozbuild_root.join("clang").join("lib");
    if libclang_dir.is_dir() {
        env::set_var("LIBCLANG_PATH", libclang_dir.to_str().unwrap());
        println!("rustc-env:LIBCLANG_PATH={}", libclang_dir.to_str().unwrap());
    } else {
        println!("warning: LIBCLANG_PATH isn't set; maybe run ./mach bootstrap with gecko");
    }
}

fn get_bash() -> PathBuf {
    // If BASH is set, use that.
    if let Ok(bash) = env::var("BASH") {
        return PathBuf::from(bash);
    }

    // When running under MOZILLABUILD, we need to make sure not to invoke
    // another instance of bash that might be sitting around (like WSL).
    match env::var("MOZILLABUILD") {
        Ok(d) => PathBuf::from(d).join("msys").join("bin").join("bash.exe"),
        Err(_) => PathBuf::from("bash"),
    }
}

fn build_nss(dir: PathBuf) {
    let mut build_nss = vec![
        String::from("./build.sh"),
        String::from("-Ddisable_tests=1"),
        // Generate static libraries in addition to shared libraries.
        String::from("--static"),
    ];
    if !is_debug() {
        build_nss.push(String::from("-o"));
    }
    if let Ok(d) = env::var("NSS_JOBS") {
        build_nss.push(String::from("-j"));
        build_nss.push(d);
    }
    let target = env::var("TARGET").unwrap();
    if target.strip_prefix("aarch64-").is_some() {
        build_nss.push(String::from("--target=arm64"));
    }
    let status = Command::new(get_bash())
        .args(build_nss)
        .current_dir(dir)
        .status()
        .expect("couldn't start NSS build");
    assert!(status.success(), "NSS build failed");
}

fn dynamic_link() {
    let libs = if env::consts::OS == "windows" {
        &["nssutil3.dll", "nss3.dll", "ssl3.dll"]
    } else {
        &["nssutil3", "nss3", "ssl3"]
    };
    dynamic_link_both(libs);
}

fn dynamic_link_both(extra_libs: &[&str]) {
    let nspr_libs = if env::consts::OS == "windows" {
        &["libplds4", "libplc4", "libnspr4"]
    } else {
        &["plds4", "plc4", "nspr4"]
    };
    for lib in nspr_libs.iter().chain(extra_libs) {
        println!("cargo:rustc-link-lib=dylib={lib}");
    }
}

fn static_link() {
    let mut static_libs = vec![
        "certdb",
        "certhi",
        "cryptohi",
        "freebl",
        "nss_static",
        "nssb",
        "nssdev",
        "nsspki",
        "nssutil",
        "pk11wrap",
        "pkcs12",
        "pkcs7",
        "smime",
        "softokn_static",
        "ssl",
    ];
    if env::consts::OS != "macos" {
        static_libs.push("sqlite");
    }
    for lib in static_libs {
        println!("cargo:rustc-link-lib=static={lib}");
    }

    // Dynamic libs that aren't transitively included by NSS libs.
    let mut other_libs = Vec::new();
    if env::consts::OS != "windows" {
        other_libs.extend_from_slice(&["pthread", "dl", "c", "z"]);
    }
    if env::consts::OS == "macos" {
        other_libs.push("sqlite3");
    }
    dynamic_link_both(&other_libs);
}

fn get_includes(nsstarget: &Path, nssdist: &Path) -> Vec<PathBuf> {
    let nsprinclude = nsstarget.join("include").join("nspr");
    let nssinclude = nssdist.join("public").join("nss");
    let includes = vec![nsprinclude, nssinclude];
    for i in &includes {
        println!("cargo:include={}", i.to_str().unwrap());
    }
    includes
}

fn build_bindings(base: &str, bindings: &Bindings, flags: &[String], gecko: bool) {
    let suffix = if bindings.cplusplus { ".hpp" } else { ".h" };
    let header_path = PathBuf::from(BINDINGS_DIR).join(String::from(base) + suffix);
    let header = header_path.to_str().unwrap();
    let out = PathBuf::from(env::var("OUT_DIR").unwrap()).join(String::from(base) + ".rs");

    println!("cargo:rerun-if-changed={header}");

    let mut builder = Builder::default().header(header);
    builder = builder.generate_comments(false);
    builder = builder.size_t_is_usize(true);

    builder = builder.clang_arg("-v");

    if !gecko {
        builder = builder.clang_arg("-DNO_NSPR_10_SUPPORT");
        if env::consts::OS == "windows" {
            builder = builder.clang_arg("-DWIN");
        } else if env::consts::OS == "macos" {
            builder = builder.clang_arg("-DDARWIN");
        } else if env::consts::OS == "linux" {
            builder = builder.clang_arg("-DLINUX");
        } else if env::consts::OS == "android" {
            builder = builder.clang_arg("-DLINUX");
            builder = builder.clang_arg("-DANDROID");
        }
        if bindings.cplusplus {
            builder = builder.clang_args(&["-x", "c++", "-std=c++14"]);
        }
    }

    builder = builder.clang_args(flags);

    // Apply the configuration.
    for v in &bindings.types {
        builder = builder.allowlist_type(v);
    }
    for v in &bindings.functions {
        builder = builder.allowlist_function(v);
    }
    for v in &bindings.variables {
        builder = builder.allowlist_var(v);
    }
    for v in &bindings.exclude {
        builder = builder.blocklist_item(v);
    }
    for v in &bindings.opaque {
        builder = builder.opaque_type(v);
    }
    for v in &bindings.enums {
        builder = builder.constified_enum_module(v);
    }

    let bindings = builder.generate().expect("unable to generate bindings");
    bindings
        .write_to_file(out)
        .expect("couldn't write bindings");
}

fn pkg_config() -> Vec<String> {
    let modversion = Command::new("pkg-config")
        .args(["--modversion", "nss"])
        .output()
        .expect("pkg-config reports NSS as absent")
        .stdout;
    let modversion = String::from_utf8(modversion).expect("non-UTF8 from pkg-config");
    let modversion = modversion.trim();
    // The NSS version number does not follow semver numbering, because it omits the patch version
    // when that's 0. Deal with that.
    let modversion_for_cmp = if modversion.chars().filter(|c| *c == '.').count() == 1 {
        modversion.to_owned() + ".0"
    } else {
        modversion.to_owned()
    };
    let modversion_for_cmp =
        Version::parse(&modversion_for_cmp).expect("NSS version not in semver format");
    let version_req = VersionReq::parse(&format!(">={}", MINIMUM_NSS_VERSION.trim())).unwrap();
    assert!(
        version_req.matches(&modversion_for_cmp),
        "neqo has NSS version requirement {version_req}, found {modversion}"
    );

    let cfg = Command::new("pkg-config")
        .args(["--cflags", "--libs", "nss"])
        .output()
        .expect("NSS flags not returned by pkg-config")
        .stdout;
    let cfg_str = String::from_utf8(cfg).expect("non-UTF8 from pkg-config");

    let mut flags: Vec<String> = Vec::new();
    for f in cfg_str.split(' ') {
        if let Some(include) = f.strip_prefix("-I") {
            flags.push(String::from(f));
            println!("cargo:include={include}");
        } else if let Some(path) = f.strip_prefix("-L") {
            println!("cargo:rustc-link-search=native={path}");
        } else if let Some(lib) = f.strip_prefix("-l") {
            println!("cargo:rustc-link-lib=dylib={lib}");
        } else {
            println!("Warning: Unknown flag from pkg-config: {f}");
        }
    }

    flags
}

fn setup_standalone(nss: &str) -> Vec<String> {
    setup_clang();

    println!("cargo:rerun-if-env-changed=NSS_DIR");
    let nss = PathBuf::from(nss);
    assert!(
        !nss.is_relative(),
        "The NSS_DIR environment variable is expected to be an absolute path."
    );

    build_nss(nss.clone());

    // $NSS_DIR/../dist/
    let nssdist = nss.parent().unwrap().join("dist");
    println!("cargo:rerun-if-env-changed=NSS_TARGET");
    let nsstarget = env::var("NSS_TARGET")
        .unwrap_or_else(|_| fs::read_to_string(nssdist.join("latest")).unwrap());
    let nsstarget = nssdist.join(nsstarget.trim());

    let includes = get_includes(&nsstarget, &nssdist);

    let nsslibdir = nsstarget.join("lib");
    println!(
        "cargo:rustc-link-search=native={}",
        nsslibdir.to_str().unwrap()
    );
    if is_debug() || env::consts::OS == "windows" {
        static_link();
    } else {
        dynamic_link();
    }

    let mut flags: Vec<String> = Vec::new();
    for i in includes {
        flags.push(String::from("-I") + i.to_str().unwrap());
    }

    flags
}

#[cfg(feature = "gecko")]
fn setup_for_gecko() -> Vec<String> {
    use mozbuild::TOPOBJDIR;

    let fold_libs = mozbuild::config::MOZ_FOLD_LIBS;
    let libs = if fold_libs {
        vec!["nss3"]
    } else {
        vec!["nssutil3", "nss3", "ssl3", "plds4", "plc4", "nspr4"]
    };

    for lib in &libs {
        println!("cargo:rustc-link-lib=dylib={}", lib);
    }

    if fold_libs {
        println!(
            "cargo:rustc-link-search=native={}",
            TOPOBJDIR.join("security").to_str().unwrap()
        );
    } else {
        println!(
            "cargo:rustc-link-search=native={}",
            TOPOBJDIR.join("dist").join("bin").to_str().unwrap()
        );
        let nsslib_path = TOPOBJDIR.join("security").join("nss").join("lib");
        println!(
            "cargo:rustc-link-search=native={}",
            nsslib_path.join("nss").join("nss_nss3").to_str().unwrap()
        );
        println!(
            "cargo:rustc-link-search=native={}",
            nsslib_path.join("ssl").join("ssl_ssl3").to_str().unwrap()
        );
        println!(
            "cargo:rustc-link-search=native={}",
            TOPOBJDIR
                .join("config")
                .join("external")
                .join("nspr")
                .join("pr")
                .to_str()
                .unwrap()
        );
    }

    let flags_path = TOPOBJDIR.join("netwerk/socket/neqo/extra-bindgen-flags");

    println!("cargo:rerun-if-changed={}", flags_path.to_str().unwrap());
    let mut flags = fs::read_to_string(flags_path)
        .expect("Failed to read extra-bindgen-flags file")
        .split_whitespace()
        .map(String::from)
        .collect::<Vec<_>>();

    flags.push(String::from("-include"));
    flags.push(
        TOPOBJDIR
            .join("dist")
            .join("include")
            .join("mozilla-config.h")
            .to_str()
            .unwrap()
            .to_string(),
    );
    flags
}

#[cfg(not(feature = "gecko"))]
fn setup_for_gecko() -> Vec<String> {
    unreachable!()
}

fn main() {
    let flags = if cfg!(feature = "gecko") {
        setup_for_gecko()
    } else if let Ok(nss_dir) = env::var("NSS_DIR") {
        setup_standalone(nss_dir.trim())
    } else {
        pkg_config()
    };

    let config_file = PathBuf::from(BINDINGS_DIR).join(BINDINGS_CONFIG);
    println!("cargo:rerun-if-changed={}", config_file.to_str().unwrap());
    let config = fs::read_to_string(config_file).expect("unable to read binding configuration");
    let config: HashMap<String, Bindings> = ::toml::from_str(&config).unwrap();

    for (k, v) in &config {
        build_bindings(k, v, &flags[..], cfg!(feature = "gecko"));
    }
}