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88 lines
2.4 KiB
88 lines
2.4 KiB
// tera-snmpd is the minimal privileged Net-SNMP configuration adapter.
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package main
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import (
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"errors"
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"log"
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"net"
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"os"
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"os/signal"
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"path/filepath"
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"syscall"
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"tera-clone/services/tera-api/internal/snmpagent"
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"tera-clone/services/tera-api/internal/snmpagent/snmpsocket"
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)
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func main() {
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controller, err := snmpagent.NewOSController(snmpagent.OSOptions{
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ConfigPath: getenv("TERA_SNMPD_CONFIG", snmpagent.DefaultConfigPath),
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PersistentPath: getenv("TERA_SNMPD_PERSISTENT_CONFIG", snmpagent.DefaultPersistentPath),
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InitScriptPath: getenv("TERA_SNMPD_INIT_SCRIPT", snmpagent.DefaultInitScriptPath),
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ServiceName: os.Getenv("TERA_SNMPD_SERVICE_NAME"),
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})
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if err != nil {
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log.Fatalf("tera-snmpd setup failed: %v", err)
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}
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socketPath := getenv("TERA_SNMPD_SOCKET", snmpsocket.DefaultSocketPath)
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listener, err := listen(socketPath)
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if err != nil {
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log.Fatalf("tera-snmpd socket setup failed: %v", err)
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}
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defer func() {
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_ = listener.Close()
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_ = os.Remove(socketPath)
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}()
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done := make(chan error, 1)
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go func() { done <- (snmpsocket.Server{Controller: controller}).Serve(listener) }()
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log.Printf("tera-snmpd serving SNMP agent control on %s", socketPath)
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signals := make(chan os.Signal, 1)
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signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
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select {
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case signal := <-signals:
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log.Printf("tera-snmpd stopping after %s", signal)
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_ = listener.Close()
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if err := <-done; err != nil {
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log.Printf("tera-snmpd stop error: %v", err)
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}
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case err := <-done:
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if err != nil {
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log.Fatalf("tera-snmpd failed: %v", err)
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}
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}
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}
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func listen(socketPath string) (net.Listener, error) {
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if socketPath == "" || !filepath.IsAbs(socketPath) {
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return nil, errors.New("TERA_SNMPD_SOCKET must be an absolute path")
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}
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if err := os.MkdirAll(filepath.Dir(socketPath), 0o750); err != nil {
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return nil, err
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}
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if info, err := os.Lstat(socketPath); err == nil {
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if info.Mode()&os.ModeSocket == 0 {
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return nil, errors.New("refusing to replace non-socket SNMP control path")
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}
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if err := os.Remove(socketPath); err != nil {
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return nil, err
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}
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} else if !os.IsNotExist(err) {
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return nil, err
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}
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listener, err := net.Listen("unix", socketPath)
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if err != nil {
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return nil, err
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}
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if err := os.Chmod(socketPath, 0o660); err != nil {
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_ = listener.Close()
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return nil, err
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}
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return listener, nil
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}
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func getenv(key, fallback string) string {
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if value := os.Getenv(key); value != "" {
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return value
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}
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return fallback
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}
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