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package main
import (
"context"
"crypto/tls"
"fmt"
"linum/internal/blocklist"
"linum/internal/cache"
"linum/internal/config"
"linum/internal/resolver"
"linum/internal/server"
"log/slog"
"os"
"os/signal"
"path/filepath"
"syscall"
"time"
)
func main() {
flags := config.ParseFlags()
cfg := config.Default()
if _, err := os.Stat(flags.Config); err == nil {
fileCfg, err := config.LoadFile(flags.Config)
if err != nil {
slog.Error("invalid config file", "err", err)
os.Exit(1)
}
cfg = config.Merge(cfg, fileCfg)
}
cfg = flags.Apply(cfg)
if err := cfg.Validate(); err != nil {
slog.Error("config validation failed", "err", err)
os.Exit(1)
}
var lvl slog.Level
_ = lvl.UnmarshalText([]byte(cfg.Log.Level))
logger := slog.New(slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{Level: lvl}))
slog.SetDefault(logger)
fmt.Println("linum - simple dns recursive")
fmt.Printf("codeberg.org/radhitya/linum\n\n")
logger.Info("config loaded", "file", flags.Config)
var ropts []resolver.Option
if cfg.Resolver.Mode == "forward" && len(cfg.Resolver.Forwarders) > 0 {
ropts = append(ropts, resolver.WithForwarders(cfg.Resolver.Forwarders))
logger.Info("resolver mode: forward", "upstreams", cfg.Resolver.Forwarders)
} else {
logger.Info("resolver mode: recursive (root hints)")
}
if dur, err := time.ParseDuration(cfg.Resolver.Timeout); err == nil {
ropts = append(ropts, resolver.WithTimeout(dur))
} else {
ropts = append(ropts, resolver.WithTimeout(2*time.Second))
}
r := resolver.New(ropts...)
c, err := cache.NewCache(cfg.Cache.MaxEntries, cfg.Cache.DBPath)
if err != nil {
logger.Error("create cache failed", "err", err)
os.Exit(1)
}
defer c.Stop()
var tlsCfg *tls.Config
if cfg.Server.ListenDoT != "" {
cert, err := tls.LoadX509KeyPair(cfg.TLS.Cert, cfg.TLS.Key)
if err != nil {
logger.Error("load tls cert failed", "err", err)
os.Exit(1)
}
tlsCfg = &tls.Config{
Certificates: []tls.Certificate{cert},
NextProtos: []string{"dot"},
}
logger.Info("dot listener configured", "addr", cfg.Server.ListenDoT)
}
var bl *blocklist.Blocklist
if len(cfg.Blocklist.Files) > 0 || len(cfg.Blocklist.URLs) > 0 {
resp := blocklist.ResponseZeroIP
if cfg.Blocklist.Response == "nxdomain" {
resp = blocklist.ResponseNXDOMAIN
}
bl = blocklist.New(resp)
for _, pattern := range cfg.Blocklist.Files {
matches, err := filepath.Glob(pattern)
if err != nil {
logger.Warn("invalid blocklist glob", "pattern", pattern, "err", err)
continue
}
for _, f := range matches {
if err := bl.LoadFile(f); err != nil {
logger.Error("load blocklist failed", "file", f, "err", err)
os.Exit(1)
}
logger.Info("blocklist loaded", "file", f, "rules", bl.TotalRules)
}
}
for _, u := range cfg.Blocklist.URLs {
if err := bl.LoadURL(u); err != nil {
logger.Warn("load blocklist url failed", "url", u, "err", err)
continue
}
logger.Info("blocklist url loaded", "url", u)
}
} else {
logger.Info("no blocklist configured, ad-blocking disabled")
}
ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
defer stop()
srv, err := server.New(cfg.Server.ListenUDP, cfg.Server.ListenTCP, cfg.Server.ListenDOH, cfg.Server.ListenDoT, tlsCfg, logger, r, c, bl, cfg)
if err != nil {
logger.Error("create server failed", "err", err)
os.Exit(1)
}
defer srv.Close()
if cfg.Admin.Listen != "" {
logger.Info("admin server configured", "addr", cfg.Admin.Listen)
}
logger.Info("linum starting",
"udp", cfg.Server.ListenUDP,
"tcp", cfg.Server.ListenTCP,
"doh", cfg.Server.ListenDOH,
"dot", cfg.Server.ListenDoT,
)
if err := srv.Run(ctx); err != nil && err != context.Canceled {
logger.Error("server stopped with error", "err", err)
os.Exit(1)
}
logger.Info("linum stopped cleanly")
}
|
