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annotate build.rs @ 81:a8f4718fed5d

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When dynamically linking against the wrong PAM, fail.
author Paul Fisher <paul@pfish.zone>
date Tue, 10 Jun 2025 01:16:39 -0400
parents 5aa1a010f1e8
children 73c3f8e3b49d
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5aa1a010f1e8 Start using PAM headers; improve owned/borrowed distinction.
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1 use bindgen::MacroTypeVariation;
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2 use std::env;
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3 use std::path::PathBuf;
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4
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5 fn main() {
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6 if cfg!(feature = "link") {
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7 println!("cargo::rustc-check-cfg=cfg(pam_impl, values(\"linux-pam\",\"openpam\"))");
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8 let common_builder = bindgen::Builder::default()
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9 .merge_extern_blocks(true)
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10 .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
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11 .blocklist_type("pam_handle")
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12 .blocklist_type("pam_conv")
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13 .allowlist_var(".*")
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14 .allowlist_function("pam_start")
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15 .allowlist_function("pam_[gs]et_item")
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16 .allowlist_function("pam_get_user")
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17 .allowlist_function("pam_get_authtok")
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18 .allowlist_function("pam_end")
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19 .dynamic_link_require_all(true)
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20 .default_macro_constant_type(MacroTypeVariation::Signed);
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21
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22 let linux_builder = common_builder
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23 .clone()
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24 // This function is not available in OpenPAM.
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25 // We don't use it, but we include it so that if the user
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26 // tries to run this against the wrong PAM library, it fails.
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27 .allowlist_function("pam_start_confdir")
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28 .header_contents(
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29 "linux-pam.h",
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30 r#"
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31 #include <security/_pam_types.h>
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32 #include <security/pam_appl.h>
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33 #include <security/pam_ext.h>
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34 #include <security/pam_modules.h>
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35 "#,
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36 );
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37 let openpam_builder = common_builder
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38 .clone()
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39 // This function is not available in Linux-PAM.
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40 // We don't use it, but we include it so that if the user
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41 // tries to run this against the wrong PAM library, it fails.
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42 .allowlist_function("pam_setenv")
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43 .header_contents(
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44 "openpam.h",
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45 r#"
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46 #include <security/openpam.h>
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47 #include <security/pam_appl.h>
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48 #include <security/pam_constants.h>
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49 #include <security/pam_types.h>
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50 "#,
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51 );
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52
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53 let (pam_impl, bindings) = {
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54 let bb = linux_builder.generate();
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55 bb.as_ref().unwrap();
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56 if let Ok(bindings) = bb {
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57 ("linux-pam", bindings)
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58 } else if let Ok(bindings) = openpam_builder.generate() {
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59 ("openpam", bindings)
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60 } else {
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61 panic!("unrecognized PAM implementation")
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62 }
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63 };
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64 println!("cargo::rustc-cfg=pam_impl={pam_impl:?}");
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65 let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
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66 bindings
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67 .write_to_file(out_path.join("bindings.rs"))
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68 .unwrap();
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69 }
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70 }