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annotate libpam-sys/build.rs @ 134:6c1e1bdb4164

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Use standard #[cfg] directives rather than custom proc macros. Instead of having to do a bunch of custom parsing and other logic that tools often choke on, this change introduces an easy way to depend upon custom #[cfg]s provided by the libpam-sys crate.
author Paul Fisher <paul@pfish.zone>
date Thu, 03 Jul 2025 11:03:36 -0400
parents a632a8874131
children efbc235f01d3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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134
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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::env;
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4 use std::ffi::{c_void, CString};
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5 use std::fs;
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6 use std::ptr::NonNull;
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7
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8 include!("src/pam_impl.rs");
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9
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10 fn main() {
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11 println!("cargo:rustc-link-lib=pam");
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12
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13 let pam_impl = match option_env!("LIBPAMSYS_IMPL") {
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14 // The default option: Guess what PAM impl we're using based on OS.
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15 None | Some("") => detect(),
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16 Some(other) => match PamImpl::try_from(other) {
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17 Ok(i) => i,
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18 Err(_) => {
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19 panic!(
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20 "unknown PAM implementation {other:?}. valid LIBPAMSYS_IMPLs are {:?}, or unset to detect", PamImpl::items()
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21 )
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22 }
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23 },
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24 };
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25 println!("{}", checkcfg());
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26 let impl_str = format!("{pam_impl:?}");
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27 println!("{}", implcfg(&impl_str));
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28 println!("cargo:rustc-env=LIBPAMSYS_IMPL={impl_str}");
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29 fs::write(
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30 format!("{}/pam_impl_const.rs", env::var("OUT_DIR").unwrap()),
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31 format!(
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32 "\
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33 impl PamImpl {{\
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34 /// The implementation of libpam this was built for (`{impl_str}`).
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35 pub const CURRENT: Self = Self::{impl_str};\
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36 /// String version for internal consumption.
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37 const CURRENT_STR: &'static str = {impl_str:?};\
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38 }}
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39 "
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40 ),
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41 )
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42 .unwrap();
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43 }
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44
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45 fn detect() -> PamImpl {
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46 if let Some(lib) = LibPam::open() {
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47 if lib.has("pam_syslog") {
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48 return PamImpl::LinuxPam;
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49 } else if lib.has("_openpam_log") {
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50 return PamImpl::OpenPam;
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51 } else if lib.has("__pam_get_authtok") {
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52 return PamImpl::Sun;
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53 }
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54 }
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55 if cfg!(target_os = "linux") {
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56 PamImpl::LinuxPam
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57 } else if cfg!(any(
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58 target_os = "macos",
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59 target_os = "freebsd",
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60 target_os = "netbsd",
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61 target_os = "dragonfly",
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62 target_os = "openbsd",
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63 )) {
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64 PamImpl::OpenPam
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65 } else if cfg!(any(target_os = "illumos", target_os = "solaris")) {
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66 PamImpl::Sun
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67 } else {
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68 PamImpl::XSso
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69 }
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70 }
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71
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72 struct LibPam(NonNull<c_void>);
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73
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74 impl LibPam {
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75 fn open() -> Option<Self> {
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76 NonNull::new(unsafe { libc::dlopen(b"libpam.so\0".as_ptr().cast(), libc::RTLD_LAZY) })
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77 .map(Self)
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78 }
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79
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80 fn has(&self, name: &str) -> bool {
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81 let name = CString::new(name).unwrap();
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82 let symbol = unsafe { libc::dlsym(self.0.as_ptr(), name.as_ptr()) };
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83 !symbol.is_null()
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84 }
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85 }
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86
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87 impl Drop for LibPam {
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88 fn drop(&mut self) {
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89 unsafe {
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90 libc::dlclose(self.0.as_ptr());
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91 }
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92 }
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93 }