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add system DNS auto-configuration (install/uninstall)

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numa install  — saves current DNS, sets all network services to 127.0.0.1
numa uninstall — restores original DNS from ~/.numa/original-dns.json
numa help — shows usage

macOS: uses networksetup to enumerate services and set/restore DNS.
Linux: stubs with instructions for manual setup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Razvan Dimescu
2026-03-20 11:39:30 +02:00
parent 27d867df98
commit 2db44bd7d0
2 changed files with 217 additions and 4 deletions
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38
src/main.rs
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@@ -13,7 +13,7 @@ use numa::ctx::{handle_query, ServerCtx};
use numa::override_store::OverrideStore;
use numa::query_log::QueryLog;
use numa::stats::ServerStats;
use numa::system_dns::discover_forwarding_rules;
use numa::system_dns::{discover_forwarding_rules, install_system_dns, uninstall_system_dns};
#[tokio::main]
async fn main() -> numa::Result<()> {
@@ -21,9 +21,39 @@ async fn main() -> numa::Result<()> {
.format_timestamp_millis()
.init();
let config_path = std::env::args()
.nth(1)
.unwrap_or_else(|| "numa.toml".to_string());
// Handle CLI subcommands
let arg1 = std::env::args().nth(1).unwrap_or_default();
match arg1.as_str() {
"install" => {
eprintln!("\x1b[1;38;2;192;98;58mNuma\x1b[0m — configuring system DNS\n");
return install_system_dns().map_err(|e| e.into());
}
"uninstall" => {
eprintln!("\x1b[1;38;2;192;98;58mNuma\x1b[0m — restoring system DNS\n");
return uninstall_system_dns().map_err(|e| e.into());
}
"help" | "--help" | "-h" => {
eprintln!("Usage: numa [command] [config-path]");
eprintln!();
eprintln!("Commands:");
eprintln!(" (none) Start the DNS server (default)");
eprintln!(" install Set system DNS to 127.0.0.1 (requires sudo)");
eprintln!(" uninstall Restore original system DNS settings");
eprintln!(" help Show this help");
eprintln!();
eprintln!("Config path defaults to numa.toml");
return Ok(());
}
_ => {}
}
let config_path = if arg1.is_empty() || arg1 == "run" {
std::env::args()
.nth(2)
.unwrap_or_else(|| "numa.toml".to_string())
} else {
arg1 // treat as config path for backwards compatibility
};
let config = load_config(&config_path)?;
let upstream: SocketAddr =