1 //! Build script for Rust modules in Tor.
3 //! We need to use this because some of our Rust tests need to use some
4 //! of our C modules, which need to link some external libraries.
6 //! This script works by looking at a "config.rust" file generated by our
7 //! configure script, and then building a set of options for cargo to pass to
10 use std::collections::HashMap;
14 use std::io::prelude::*;
15 use std::path::PathBuf;
17 /// Wrapper around a key-value map.
18 struct Config(HashMap<String, String>);
20 /// Locate a config.rust file generated by autoconf, starting in the OUT_DIR
21 /// location provided by cargo and recursing up the directory tree. Note that
22 /// we need to look in the OUT_DIR, since autoconf will place generated files
23 /// in the build directory.
24 fn find_cfg() -> io::Result<String> {
25 let mut path = PathBuf::from(env::var("OUT_DIR").unwrap());
27 path.push("config.rust");
29 return Ok(path.to_str().unwrap().to_owned());
31 path.pop(); // remove config.rust
33 // can't remove last part of directory
34 return Err(io::Error::new(io::ErrorKind::NotFound, "No config.rust"));
40 /// Find the config.rust file and try to parse it.
42 /// The file format is a series of lines of the form KEY=VAL, with
43 /// any blank lines and lines starting with # ignored.
44 fn load() -> io::Result<Config> {
45 let path = find_cfg()?;
46 let f = File::open(&path)?;
47 let reader = io::BufReader::new(f);
48 let mut map = HashMap::new();
49 for line in reader.lines() {
51 if s.trim().starts_with("#") || s.trim() == "" {
54 let idx = match s.find("=") {
56 return Err(io::Error::new(io::ErrorKind::InvalidData, "missing ="));
60 let (var, eq_val) = s.split_at(idx);
61 let val = &eq_val[1..];
62 map.insert(var.to_owned(), val.to_owned());
67 /// Return a reference to the value whose key is 'key'.
69 /// Panics if 'key' is not found in the configuration.
70 fn get(&self, key: &str) -> &str {
71 self.0.get(key).unwrap()
74 /// Add a dependency on a static C library that is part of Tor, by name.
75 fn component(&self, s: &str) {
76 println!("cargo:rustc-link-lib=static={}", s);
79 /// Add a dependency on a native library that is not part of Tor, by name.
80 fn dependency(&self, s: &str) {
81 println!("cargo:rustc-link-lib={}", s);
84 /// Add a link path, relative to Tor's build directory.
85 fn link_relpath(&self, s: &str) {
86 let builddir = self.get("BUILDDIR");
87 println!("cargo:rustc-link-search=native={}/{}", builddir, s);
90 /// Add an absolute link path.
91 fn link_path(&self, s: &str) {
92 println!("cargo:rustc-link-search=native={}", s);
95 /// Parse the CFLAGS in s, looking for -l and -L items, and adding
96 /// rust configuration as appropriate.
97 fn from_cflags(&self, s: &str) {
98 let mut next_is_lib = false;
99 let mut next_is_path = false;
100 for ent in self.get(s).split_whitespace() {
102 self.dependency(ent);
104 } else if next_is_path {
106 next_is_path = false;
107 } else if ent == "-l" {
109 } else if ent == "-L" {
111 } else if ent.starts_with("-L") {
112 self.link_path(&ent[2..]);
113 } else if ent.starts_with("-l") {
114 self.dependency(&ent[2..]);
121 let cfg = Config::load().unwrap();
122 let package = env::var("CARGO_PKG_NAME").unwrap();
124 match package.as_ref() {
126 // Right now, I'm having a separate configuration for each Rust
127 // package, since I'm hoping we can trim them down. Once we have a
128 // second Rust package that needs to use this build script, let's
129 // extract some of this stuff into a module.
131 // This is a ridiculous amount of code to be pulling in just
132 // to test our crypto library: modularity would be our
134 cfg.from_cflags("TOR_LDFLAGS_zlib");
135 cfg.from_cflags("TOR_LDFLAGS_openssl");
136 cfg.from_cflags("TOR_LDFLAGS_libevent");
138 cfg.link_relpath("src/lib");
139 cfg.link_relpath("src/ext/keccak-tiny");
140 cfg.link_relpath("src/ext/ed25519/ref10");
141 cfg.link_relpath("src/ext/ed25519/donna");
142 cfg.link_relpath("src/trunnel");
144 // Note that we can't pull in "libtor-testing", or else we
145 // will have dependencies on all the other rust packages that
146 // tor uses. We must be careful with factoring and dependencies
148 cfg.component("tor-crypt-ops-testing");
149 cfg.component("tor-sandbox-testing");
150 cfg.component("tor-encoding-testing");
151 cfg.component("tor-fs-testing");
152 cfg.component("tor-net-testing");
153 cfg.component("tor-buf-testing");
154 cfg.component("tor-time-testing");
155 cfg.component("tor-thread-testing");
156 cfg.component("tor-memarea-testing");
157 cfg.component("tor-log-testing");
158 cfg.component("tor-lock-testing");
159 cfg.component("tor-fdio-testing");
160 cfg.component("tor-container-testing");
161 cfg.component("tor-smartlist-core-testing");
162 cfg.component("tor-string-testing");
163 cfg.component("tor-malloc");
164 cfg.component("tor-wallclock");
165 cfg.component("tor-err-testing");
166 cfg.component("tor-version-testing");
167 cfg.component("tor-intmath-testing");
168 cfg.component("tor-ctime-testing");
169 cfg.component("curve25519_donna");
170 cfg.component("keccak-tiny");
171 cfg.component("ed25519_ref10");
172 cfg.component("ed25519_donna");
173 cfg.component("or-trunnel-testing");
175 cfg.from_cflags("TOR_ZLIB_LIBS");
176 cfg.from_cflags("TOR_LIB_MATH");
177 cfg.from_cflags("NSS_LIBS");
178 cfg.from_cflags("TOR_OPENSSL_LIBS");
179 cfg.from_cflags("TOR_LIBEVENT_LIBS");
180 cfg.from_cflags("TOR_LIB_WS32");
181 cfg.from_cflags("TOR_LIB_GDI");
182 cfg.from_cflags("TOR_LIB_USERENV");
183 cfg.from_cflags("CURVE25519_LIBS");
184 cfg.from_cflags("TOR_LZMA_LIBS");
185 cfg.from_cflags("TOR_ZSTD_LIBS");
186 cfg.from_cflags("LIBS");
189 panic!("No configuration in build.rs for package {}", package);