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annotate libpam-sys/libpam-sys-helpers/build.rs @ 136:efbc235f01d3

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Separate libpam-sys-helpers from libpam-sys. This separates the parts of libpam-sys that don't need linking against libpam from the parts that do need to link against libpam.
author Paul Fisher <paul@pfish.zone>
date Thu, 03 Jul 2025 14:28:04 -0400
parents libpam-sys/build.rs@6c1e1bdb4164
children
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1 #![allow(unexpected_cfgs)]
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c77846f3a979 GET CTEST WORKING.
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2
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3 use std::ffi::{c_void, CString};
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4 use std::ptr::NonNull;
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5 use std::{env, fs};
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6
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7 include!("src/pam_impl.rs");
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8
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9 fn main() {
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10 let pam_impl = match option_env!("LIBPAMSYS_IMPL") {
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11 // The default option: Guess what PAM impl we're using based on OS.
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12 None | Some("") => LibPam::detect(),
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13 Some(other) => match PamImpl::try_from(other) {
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14 Ok(i) => i,
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15 Err(_) => {
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16 panic!(
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17 "unknown PAM implementation {other:?}. valid LIBPAMSYS_IMPLs are {:?}, or unset to detect", PamImpl::items()
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18 )
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19 }
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20 },
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21 };
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22 let impl_str = format!("{pam_impl:?}");
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23 println!("{}", generate_cfg(&impl_str));
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24 // We set this environment variable to substitute into docstrings.
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25 println!("cargo:rustc-env=LIBPAMSYS_IMPL={impl_str}");
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26 fs::write(
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27 format!("{}/pam_impl_const.rs", env::var("OUT_DIR").unwrap()),
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28 generate_consts(&impl_str),
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29 )
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30 .unwrap();
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31 }
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32
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33 fn generate_consts(impl_str: &str) -> String {
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34 format!(
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35 "\
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36 impl PamImpl {{
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37 /// The implementation of libpam this was built for (`{impl_str}`).
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38 pub const CURRENT: Self = Self::{impl_str};
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39 }}
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40
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41 /// String name of [`PamImpl::CURRENT`], for substituting into docs.
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42 #[macro_export]
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43 macro_rules! pam_impl_name {{ () => ({impl_str:?}) }}
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44 "
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45 )
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46 }
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47
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48 struct LibPam(NonNull<c_void>);
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49
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50 impl LibPam {
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51 fn detect() -> PamImpl {
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52 if let Some(lib) = Self::open() {
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53 if lib.has("pam_syslog") {
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54 return PamImpl::LinuxPam;
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55 } else if lib.has("_openpam_log") {
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56 return PamImpl::OpenPam;
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57 } else if lib.has("__pam_get_authtok") {
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58 return PamImpl::Sun;
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59 }
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60 }
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61 if cfg!(target_os = "linux") {
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62 PamImpl::LinuxPam
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63 } else if cfg!(any(
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64 target_os = "macos",
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65 target_os = "freebsd",
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66 target_os = "netbsd",
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67 target_os = "dragonfly",
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68 target_os = "openbsd",
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69 )) {
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70 PamImpl::OpenPam
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71 } else if cfg!(any(target_os = "illumos", target_os = "solaris")) {
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72 PamImpl::Sun
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73 } else {
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74 PamImpl::XSso
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75 }
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76 }
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77
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78 fn open() -> Option<Self> {
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79 NonNull::new(unsafe { libc::dlopen(b"libpam.so\0".as_ptr().cast(), libc::RTLD_LAZY) })
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80 .map(Self)
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81 }
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82
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83 fn has(&self, name: &str) -> bool {
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84 let name = CString::new(name).unwrap();
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85 let symbol = unsafe { libc::dlsym(self.0.as_ptr(), name.as_ptr()) };
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86 !symbol.is_null()
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87 }
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88 }
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89
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90 impl Drop for LibPam {
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91 fn drop(&mut self) {
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92 unsafe {
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93 libc::dlclose(self.0.as_ptr());
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94 }
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95 }
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96 }