add a new caller implementation

Cargo.toml

 [workspace]
-members = ["cwe_checker_rs"]
+members = ["cwe_checker_rs", "caller"]

caller/Cargo.toml

+[package]
+name = "cwe_checker"
+version = "0.4.0-dev"
+authors = ["Enkelmann <nils-edvin.enkelmann@fkie.fraunhofer.de>"]
+edition = "2018"
+
+[dependencies]
+structopt = "0.3"
\ No newline at end of file

caller/src/main.rs

+use std::process::Command;
+use structopt::StructOpt;
+
+#[derive(Debug, StructOpt)]
+/// Find vulnerable patterns in binary executables
+struct CmdlineArgs {
+    /// The path to the binary.
+    binary: String,
+
+    /// Path to a custom configuration file to use instead of the standard one.
+    #[structopt(long, short)]
+    config: Option<String>,
+
+    /// Write the results to a file.
+    #[structopt(long, short)]
+    out: Option<String>,
+
+    /// Specify a specific set of checks to be run.
+    #[structopt(long, short)]
+    partial: Option<String>,
+
+    /// Generate JSON output.
+    #[structopt(long, short)]
+    json: bool,
+
+    /// Do not print log messages. This prevents polluting STDOUT for json output.
+    #[structopt(long, short)]
+    quiet: bool,
+
+    /// Checks if there is a path from an input function to a CWE hit.
+    #[structopt(long)]
+    check_path: bool,
+
+    /// Prints out the version numbers of all known modules.
+    #[structopt(long)]
+    module_versions: bool,
+}
+
+fn main() {
+    let cmdline_args = CmdlineArgs::from_args();
+
+    if let Some(exit_code) = build_bap_command(&cmdline_args).status().unwrap().code() {
+        std::process::exit(exit_code);
+    }
+}
+
+/// Build the BAP command corresponding to the given command line arguments.
+fn build_bap_command(args: &CmdlineArgs) -> Command {
+    let mut command = Command::new("bap");
+    command.arg(&args.binary);
+    command.arg("--pass=cwe-checker");
+    if let Some(ref string) = args.config {
+        command.arg("--cwe-checker-config=".to_string() + string);
+    }
+    if let Some(ref string) = args.out {
+        command.arg("--cwe-checker-out=".to_string() + string);
+    }
+    if let Some(ref string) = args.partial {
+        command.arg("--cwe-checker-partial=".to_string() + string);
+    }
+    if args.json {
+        command.arg("--cwe-checker-json");
+    }
+    if args.quiet {
+        command.arg("--cwe-checker-no-logging");
+    }
+    if args.check_path {
+        command.arg("--cwe-checker-check-path");
+    }
+    if args.module_versions {
+        command.arg("--cwe-checker-module-versions");
+    }
+    command
+}

cwe_checker_rs/Cargo.toml

 [package]
 name = "cwe_checker_rs"
-version = "0.1.0"
+version = "0.4.0-dev"
 authors = ["Nils-Edvin Enkelmann <nils-edvin.enkelmann@fkie.fraunhofer.de>"]
 edition = "2018"