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annotate build.rs @ 98:b87100c5eed4

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Start on environment variables, and make pointers nicer. This starts work on the PAM environment handling, and in so doing, introduces the CHeapBox and CHeapString structs. These are analogous to Box and CString, but they're located on the C heap rather than being Rust-managed memory. This is because environment variables deal with even more pointers and it turns out we can lose a lot of manual freeing using homemade smart pointers.
author Paul Fisher <paul@pfish.zone>
date Tue, 24 Jun 2025 04:25:25 -0400
parents efe2f5f8b5b2
children 3f11b8d30f63
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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-link-lib=pam");
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8 println!("cargo::rustc-check-cfg=cfg(pam_impl, values(\"linux-pam\",\"openpam\"))");
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9 let common_builder = bindgen::Builder::default()
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10 .merge_extern_blocks(true)
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11 .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
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12 .blocklist_type("pam_handle")
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13 .blocklist_type("pam_conv")
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14 .allowlist_var(".*")
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15 .allowlist_function("pam_start")
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16 .allowlist_function("pam_[gs]et_item")
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17 .allowlist_function("pam_get_user")
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18 .allowlist_function("pam_get_authtok")
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19 .allowlist_function("pam_end")
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20 .allowlist_function("pam_strerror")
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21 .allowlist_function("pam_authenticate")
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22 .allowlist_function("pam_chauthtok")
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23 .allowlist_function("pam_acct_mgmt")
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24 .default_macro_constant_type(MacroTypeVariation::Unsigned);
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26 let linux_builder = common_builder
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27 .clone()
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28 // This function is not available in OpenPAM.
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29 // That means if somebody tries to run a binary compiled for
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30 // Linux-PAM against a different impl, it will fail.
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31 .allowlist_function("pam_syslog")
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32 .header_contents(
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33 "linux-pam.h",
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34 r#"
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35 #include <syslog.h> // for log levels
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36 #include <security/_pam_types.h>
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37 #include <security/pam_appl.h>
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38 #include <security/pam_ext.h>
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39 #include <security/pam_modules.h>
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40 "#,
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41 );
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42 let openpam_builder = common_builder
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43 .clone()
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44 // This function is not available in Linux-PAM.
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45 // That means if somebody tries to run a binary compiled for
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46 // OpenPAM against a different impl, it will fail.
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47 .allowlist_function("openpam_log")
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48 .header_contents(
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49 "openpam.h",
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50 r#"
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51 #include <security/pam_types.h>
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52 #include <security/openpam.h>
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53 #include <security/pam_appl.h>
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54 #include <security/pam_constants.h>
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55 "#,
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56 );
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57
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58 let (pam_impl, bindings) = {
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59 if let Ok(bindings) = linux_builder.generate() {
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60 ("linux-pam", bindings)
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61 } else if let Ok(bindings) = openpam_builder.generate() {
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62 ("openpam", bindings)
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63 } else {
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64 panic!("unrecognized PAM implementation")
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65 }
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66 };
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67 println!("cargo::rustc-cfg=pam_impl={pam_impl:?}");
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68 let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
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69 bindings
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70 .write_to_file(out_path.join("bindings.rs"))
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71 .unwrap();
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72 }
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73 }