diff --git a/Cargo.toml b/Cargo.toml index 1d15ccd140..ff939586bb 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -1,8 +1,6 @@ [workspace] -members = [ - "libclamav_rust", -] +members = ["libclamav_rust", "clamav-sys"] [profile.dev.package."*"] opt-level = 2 diff --git a/clamav-sys/.gitignore b/clamav-sys/.gitignore new file mode 100644 index 0000000000..96ef6c0b94 --- /dev/null +++ b/clamav-sys/.gitignore @@ -0,0 +1,2 @@ +/target +Cargo.lock diff --git a/clamav-sys/Cargo.toml b/clamav-sys/Cargo.toml new file mode 100644 index 0000000000..6beff91f14 --- /dev/null +++ b/clamav-sys/Cargo.toml @@ -0,0 +1,22 @@ +[package] +authors = [ + "Jonas Zaddach ", + "Scott Hutton ", +] +categories = ["external-ffi-bindings"] +description = "ClamAV low level bindings for Rust" +edition = "2021" +homepage = "https://github.com/Cisco-Talos/clamav-sys/" +license = "GPL-2.0" +name = "clamav-sys" +repository = "https://github.com/Cisco-Talos/clamav-sys/" +version = "1.0.0" + +[build-dependencies] +bindgen = "0.64.0" + +[target.'cfg(unix)'.build-dependencies] +pkg-config = "0.3" + +[target.'cfg(windows)'.build-dependencies] +vcpkg = "0.2.10" diff --git a/clamav-sys/LICENSE b/clamav-sys/LICENSE new file mode 100644 index 0000000000..d159169d10 --- /dev/null +++ b/clamav-sys/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/clamav-sys/README.md b/clamav-sys/README.md new file mode 100644 index 0000000000..869cff4ed0 --- /dev/null +++ b/clamav-sys/README.md @@ -0,0 +1,64 @@ +# clamav-sys + +clamav-sys is a minimal Rust interface around [libclamav](https://www.clamav.net). +This package is not supposed to be used stand-alone, but only through its safe wrapper, +clamav-rs. + + +## Building + +### Unix (anything but Windows) +You should have the `clamav-dev` package of your distribution installed (ClamAV +with headers). The headers and library should be picked up automatically via +pkg-config. + +### Windows +#### vcpkg +The preferred way of handling dependencies is `vcpkg`. +Point `$env:VCPKG_ROOT` to your `vcpkg` installation, and set +`$env:VCPKGRS_DYNAMIC=1` to use dynamic linking (the default method of linking will +likely not work, as `pdcurses` doesn't support the `x64-windows-static-md` triplet). + +See the [vcpkg crate's documentation](https://docs.rs/vcpkg) for more details. + +Gotchas: +- Windows has its own version of a zlib dll that is incompatbile with vcpkg. If + you get a message such as "The procedure entry point gzdirect could not be + located in the dynamic link library", you'll want to make sure that the vcpkg + dynamic libraries in your PATH variable are preceding the Windows one. + ``` + $env:PATH="$env:VCPKG_ROOT\installed\x64-windows\bin\;$env:PATH" + ``` + This error is especially hard to diagnose in PowerShell, as the process will + just hang without any output. In cmd.exe you'll get the aforementioned dialog + box telling you about the error. + + +#### Manual +If `vcpkg` is not available or cannot be found on your system, the build defaults +to a manual specification of dependencies. +You will need to define the following environment variables: +- `CLAMAV_SOURCE`: Points to the directory where the ClamAV source is located. +- `CLAMAV_BUILD`: Points to the ClamAV build directory. +- `OPENSSL_INCLUDE`: Points to the include directory containing `openssl/ssl.h`. + +### MacOS +Install the development dependencies via `homebrew`: +``` +brew install clamav openssl@1.1 +``` + +OpenSSL is not included in the environment to avoid shadowing Apple's one, so +you need to tell the build script where it is located: +``` +export OPENSSL_ROOT_DIR=/usr/local/Cellar/openssl@1.1/1.1.1i/ +``` + +## Versioning +The version number of `libclamav-sys` tracks ClamAV's version number. That is, +you'll require at least ClamAV 1.0.0 to build `libclamav-sys` 1.0.0. As ClamAV +usually doesn't do breaking API changes, you'll be able to use `libclamav-sys` +with newer ClamAV versions. + +No attempt at preserving downward compatibility (using a `libclamav-sys` with +a version number greater than ClamAV's) is made. diff --git a/clamav-sys/build.rs b/clamav-sys/build.rs new file mode 100644 index 0000000000..98479cfe57 --- /dev/null +++ b/clamav-sys/build.rs @@ -0,0 +1,226 @@ +// Copyright (C) 2020-2023 Cisco Systems, Inc. and/or its affiliates. All rights reserved. +// +// Authors: Jonas Zaddach, Scott Hutton +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License version 2 as +// published by the Free Software Foundation. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, +// MA 02110-1301, USA. + +use std::env; +use std::path::PathBuf; + +// Generate bindings for these functions: +const BINDGEN_FUNCTIONS: &[&str] = &[ + "cl_cleanup_crypto", + "cl_cvdfree", + "cl_cvdparse", + "cl_debug", + "cl_engine_addref", + "cl_engine_compile", + "cl_engine_free", + "cl_engine_get_num", + "cl_engine_get_str", + "cl_engine_new", + "cl_engine_set_clcb_engine_compile_progress", + "cl_engine_set_clcb_engine_free_progress", + "cl_engine_set_clcb_file_inspection", + "cl_engine_set_clcb_file_props", + "cl_engine_set_clcb_hash", + "cl_engine_set_clcb_meta", + "cl_engine_set_clcb_post_scan", + "cl_engine_set_clcb_pre_cache", + "cl_engine_set_clcb_pre_scan", + "cl_engine_set_clcb_sigload", + "cl_engine_set_clcb_sigload_progress", + "cl_engine_set_clcb_stats_add_sample", + "cl_engine_set_clcb_stats_decrement_count", + "cl_engine_set_clcb_stats_flush", + "cl_engine_set_clcb_stats_get_hostid", + "cl_engine_set_clcb_stats_get_num", + "cl_engine_set_clcb_stats_get_size", + "cl_engine_set_clcb_stats_remove_sample", + "cl_engine_set_clcb_stats_submit", + "cl_engine_set_clcb_virus_found", + "cl_engine_set_num", + "cl_engine_set_stats_set_cbdata", + "cl_engine_set_str", + "cl_engine_settings_apply", + "cl_engine_settings_copy", + "cl_engine_settings_free", + "cl_engine_stats_enable", + "cl_fmap_close", + "cl_fmap_open_handle", + "cl_fmap_open_memory", + "cl_init", + "cl_initialize_crypto", + "cl_load", + "cl_retdbdir", + "cl_retflevel", + "cl_retver", + "cl_scandesc", + "cl_scandesc_callback", + "cl_scanfile", + "cl_scanfile_callback", + "cl_scanmap_callback", + "cl_set_clcb_msg", + "cl_strerror", + "cli_append_virus", + "cli_ctx", + "cli_dbgmsg_no_inline", + "cli_errmsg", + "cli_get_debug_flag", + "cli_getdsig", + "cli_infomsg_simple", + "cli_versig2", + "cli_warnmsg", + "lsig_increment_subsig_match", +]; + +// Generate bindings for these types (structs, prototypes, etc.): +const BINDGEN_TYPES: &[&str] = &[ + "cl_cvd", + "clcb_file_props", + "clcb_meta", + "clcb_post_scan", + "clcb_pre_scan", + "cli_ac_data", + "cli_ac_result", + "cli_matcher", + "time_t", +]; + +// Generate "newtype" enums for these C enums +const BINDGEN_ENUMS: &[&str] = &["cl_engine_field", "cl_error_t", "cl_msg"]; + +const BINDGEN_CONSTANTS: &[&str] = &[ + "CL_DB_.*", + "CL_INIT_DEFAULT", + "CL_SCAN_.*", + "ENGINE_OPTIONS_.*", + "LAYER_ATTRIBUTES_.*", +]; + +const CLAMAV_LIBRARY_NAME: &str = "clamav"; + +fn generate_bindings(customize_bindings: &dyn Fn(bindgen::Builder) -> bindgen::Builder) { + let mut bindings = bindgen::Builder::default(); + for function in BINDGEN_FUNCTIONS { + bindings = bindings.allowlist_function(function); + } + + for typename in BINDGEN_TYPES { + bindings = bindings.allowlist_type(typename); + } + + for typename in BINDGEN_ENUMS { + bindings = bindings.newtype_enum(typename); + } + + for constant in BINDGEN_CONSTANTS { + bindings = bindings.allowlist_var(constant); + } + + bindings = bindings + .header("wrapper.h") + // Tell cargo to invalidate the built crate whenever any of the + // included header files changed. + .parse_callbacks(Box::new(bindgen::CargoCallbacks)); + + bindings = customize_bindings(bindings); + + // Write the bindings to the $OUT_DIR/bindings.rs file. + let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()); + + bindings + // Finish the builder and generate the bindings. + .generate() + // Unwrap the Result and panic on failure. + .expect("Unable to generate bindings") + .write_to_file(out_path.join("bindings.rs")) + .expect("Couldn't write bindings!"); +} + +fn cargo_common() { + println!("cargo:rustc-link-lib=dylib={}", CLAMAV_LIBRARY_NAME); + + // Tell cargo to invalidate the built crate whenever the wrapper changes + println!("cargo:rerun-if-changed=wrapper.h"); +} + +#[cfg(windows)] +fn main() { + let include_paths = match vcpkg::find_package("clamav") { + Ok(pkg) => pkg.include_paths, + Err(err) => { + println!( + "cargo:warning=Either vcpkg is not installed, or an error occurred in vcpkg: {}", + err + ); + let clamav_source = PathBuf::from(env::var("CLAMAV_SOURCE").expect("CLAMAV_SOURCE environment variable must be set and point to ClamAV's source directory")); + let clamav_build = PathBuf::from(env::var("CLAMAV_BUILD").expect("CLAMAV_BUILD environment variable must be set and point to ClamAV's build directory")); + let openssl_include = PathBuf::from(env::var("OPENSSL_INCLUDE").expect("OPENSSL_INCLUDE environment variable must be set and point to openssl's include directory")); + let profile = env::var("PROFILE").unwrap(); + + let library_path = match profile.as_str() { + "debug" => std::path::Path::new(&clamav_build).join("libclamav/Debug"), + "release" => std::path::Path::new(&clamav_build).join("libclamav/Release"), + _ => panic!("Unexpected build profile"), + }; + + println!( + "cargo:rustc-link-search=native={}", + library_path.to_str().unwrap() + ); + + vec![ + clamav_source.join("libclamav"), + clamav_build, + openssl_include, + ] + } + }; + + cargo_common(); + generate_bindings(&|x: bindgen::Builder| -> bindgen::Builder { + let mut x = x; + for include_path in &include_paths { + x = x.clang_arg("-I").clang_arg(include_path.to_str().unwrap()); + } + x + }); +} + +#[cfg(unix)] +fn main() { + let libclamav = pkg_config::Config::new() + .atleast_version("0.103") + .probe("libclamav") + .unwrap(); + + let mut include_paths = libclamav.include_paths; + + if let Some(val) = std::env::var_os("OPENSSL_ROOT_DIR") { + let mut openssl_include_dir = PathBuf::from(val); + openssl_include_dir.push("include"); + include_paths.push(openssl_include_dir); + } + + cargo_common(); + generate_bindings(&|x: bindgen::Builder| -> bindgen::Builder { + let mut x = x; + for include_path in &include_paths { + x = x.clang_arg("-I").clang_arg(include_path.to_str().unwrap()); + } + x + }); +} diff --git a/clamav-sys/src/lib.rs b/clamav-sys/src/lib.rs new file mode 100644 index 0000000000..a926b9551d --- /dev/null +++ b/clamav-sys/src/lib.rs @@ -0,0 +1,178 @@ +// Copyright (C) 2020-2023 Cisco Systems, Inc. and/or its affiliates. All rights reserved. +// +// Authors: Jonas Zaddach, Scott Hutton +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License version 2 as +// published by the Free Software Foundation. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, +// MA 02110-1301, USA. + +#![warn(clippy::all, clippy::pedantic)] +#![allow( + non_camel_case_types, + non_upper_case_globals, + clippy::unreadable_literal +)] + +use std::ffi::CStr; + +include!(concat!(env!("OUT_DIR"), "/bindings.rs")); + +impl Default for cl_scan_options { + fn default() -> Self { + cl_scan_options { + general: 0, + parse: CL_SCAN_PARSE_ARCHIVE + | CL_SCAN_PARSE_MAIL + | CL_SCAN_PARSE_OLE2 + | CL_SCAN_PARSE_PDF + | CL_SCAN_PARSE_HTML + | CL_SCAN_PARSE_SWF + | CL_SCAN_PARSE_PE + | CL_SCAN_PARSE_ELF + | CL_SCAN_PARSE_SWF + | CL_SCAN_PARSE_XMLDOCS, + heuristic: 0, + mail: 0, + dev: 0, + } + } +} + +impl PartialEq for cl_scan_options { + fn eq(&self, other: &Self) -> bool { + self.general == other.general + && self.parse == other.parse + && self.heuristic == other.heuristic + && self.mail == other.mail + && self.dev == other.dev + } +} + +/// We need this for Windows, MSVC will use an `i32` as underlying enum type instead of `u32` like +/// gcc and clang. +impl From for cl_error_t { + fn from(val: i32) -> cl_error_t { + unsafe { cl_error_t(std::mem::transmute(val)) } + } +} + +impl From for cl_error_t { + fn from(val: u32) -> cl_error_t { + cl_error_t(val) + } +} + +impl From for i32 { + fn from(val: cl_error_t) -> i32 { + unsafe { std::mem::transmute(val.0) } + } +} + +impl From for u32 { + fn from(val: cl_error_t) -> u32 { + val.0 + } +} + +impl std::fmt::Display for cl_error_t { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + unsafe { + let msg = CStr::from_ptr(cl_strerror(*self)); + f.write_str(msg.to_str().unwrap_or("")) + } + } +} + +/// We need this for Windows, MSVC will use an `i32` as underlying enum type instead of `u32` like +/// gcc and clang. +impl From for cl_engine_field { + fn from(val: i32) -> cl_engine_field { + unsafe { cl_engine_field(std::mem::transmute(val)) } + } +} + +impl From for cl_engine_field { + fn from(val: u32) -> cl_engine_field { + cl_engine_field(val) + } +} + +impl From for i32 { + fn from(val: cl_engine_field) -> i32 { + unsafe { std::mem::transmute(val.0) } + } +} + +impl From for u32 { + fn from(val: cl_engine_field) -> u32 { + val.0 + } +} + +impl std::fmt::Display for cl_engine_field { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + std::fmt::Display::fmt(&self.0, f) + } +} + +/// We need this for Windows, MSVC will use an `i32` as underlying enum type instead of `u32` like +/// gcc and clang. +impl From for cl_msg { + fn from(val: i32) -> cl_msg { + unsafe { cl_msg(std::mem::transmute(val)) } + } +} + +impl From for cl_msg { + fn from(val: u32) -> cl_msg { + cl_msg(val) + } +} + +impl From for i32 { + fn from(val: cl_msg) -> i32 { + unsafe { std::mem::transmute(val.0) } + } +} + +impl From for u32 { + fn from(val: cl_msg) -> u32 { + val.0 + } +} + +impl std::fmt::Display for cl_msg { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + std::fmt::Display::fmt(&self.0, f) + } +} + +#[cfg(test)] +mod tests { + use super::cl_msg; + + #[test] + fn msg_levels_exist() { + // Just a compilation check that the message levels are there. We don't + // check their values since those are defined in the C header file. + assert!(cl_msg::CL_MSG_WARN != cl_msg(0)); + assert!(cl_msg::CL_MSG_ERROR != cl_msg(0)); + assert!(cl_msg::CL_MSG_INFO_VERBOSE != cl_msg(0)); + } + + #[test] + fn test_cl_error_t_to_string() { + let err = super::cl_error_t::CL_EMEM; + assert_eq!(err.to_string(), "Can't allocate memory".to_string()); + } +} diff --git a/clamav-sys/wrapper.h b/clamav-sys/wrapper.h new file mode 100644 index 0000000000..9f0a279db8 --- /dev/null +++ b/clamav-sys/wrapper.h @@ -0,0 +1 @@ +#include