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use std::fs::{self, File, OpenOptions};
use std::io::{Seek, SeekFrom, Write};
use std::path::Path;
use crate::CommandError;
impl From<toml_edit::Value> for CommandError {
fn from(error: toml_edit::Value) -> CommandError {
CommandError(error.to_string())
}
}
pub fn new_program(name: &str) -> Result<(), CommandError> {
use toml_edit::{value, Array, ArrayOfTables, Document, Item, Table};
let ident = name_to_ident(name);
let current_dir = std::env::current_dir().unwrap();
let path = Path::new("Cargo.toml");
if !path.exists() {
return Err(CommandError(format!(
"Could not find `Cargo.toml' in {:?}",
current_dir
)));
}
let data = fs::read_to_string(path).unwrap();
let mut config = data.parse::<Document>().unwrap();
let crate_name = config["lib"]["name"]
.as_str()
.or_else(|| config["package"]["name"].as_str())
.ok_or_else(|| CommandError("invalid manifest syntax".to_string()))
.map(String::from)?;
let mut targets = match &config["bin"] {
Item::None => ArrayOfTables::new(),
Item::ArrayOfTables(array) => array.clone(),
_ => return Err(CommandError("invalid manifest syntax".to_string())),
};
if targets
.iter()
.any(|target| target["name"].as_str().map(|s| s == name).unwrap_or(false))
{
return Err(CommandError(format!(
"a program named `{}' already exists",
name
)));
}
let mut target = Table::new();
target.entry("name").or_insert(value(name));
target
.entry("path")
.or_insert(value(format!("src/{}/main.rs", name)));
let mut features = Array::default();
features.push("probes")?;
target.entry("required-features").or_insert(value(features));
targets.append(target);
config["bin"] = Item::ArrayOfTables(targets);
fs::write(path, config.to_string())?;
let src = Path::new("src");
let lib_rs = src.join("lib.rs");
let mut file = OpenOptions::new().write(true).open(lib_rs)?;
file.seek(SeekFrom::End(0))?;
writeln!(&mut file, "pub mod {};", ident)?;
let probe_dir = src.join(name);
fs::create_dir_all(probe_dir.clone())?;
let mod_rs = probe_dir.join("mod.rs");
fs::write(
mod_rs,
r#"
use cty::*;
// This is where you should define the types shared by the kernel and user
// space, eg:
//
// #[repr(C)]
// #[derive(Debug)]
// pub struct SomeEvent {
// pub pid: u64,
// ...
// }
"#,
)?;
let main_rs = probe_dir.join("main.rs");
let mut main_rs = File::create(main_rs)?;
write!(
&mut main_rs,
r#"#![no_std]
#![no_main]
use cty::*;
// use one of the preludes
// use redbpf_probes::kprobe::prelude::*;
// use redbpf_probes::xdp::prelude::*;
// use redbpf_probes::socket_filter::prelude::*;
// use redbpf_probes::tc::prelude::*;
// use redbpf_probes::uprobe::prelude::*;
// use redbpf_probes::sockmap::prelude::*;
// use redbpf_probes::bpf_iter::prelude::*;
// Use the types you're going to share with userspace, eg:
// use {lib}::{name}::SomeEvent;
program!(0xFFFFFFFE, "GPL");
// The maps and probe functions go here, eg:
//
// #[map]
// static mut syscall_events: PerfMap<SomeEvent> = PerfMap::with_max_entries(1024);
//
// #[kprobe("__x64_sys_open")]
// fn syscall_enter(regs: Registers) {{
// let pid_tgid = bpf_get_current_pid_tgid();
// ...
//
// let event = SomeEvent {{
// pid: pid_tgid >> 32,
// ...
// }};
// unsafe {{ syscall_events.insert(regs.ctx, &event) }};
// }}
"#,
lib = name_to_ident(crate_name.as_str()),
name = name_to_ident(name),
)?;
Ok(())
}
fn name_to_ident(name: &str) -> String {
name.replace("-", "_")
}
