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daemon.go
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daemon.go
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// Copyright 2023 The Inspektor Gadget authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"os"
"os/user"
"path/filepath"
"strconv"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
gadgetservice "github.com/inspektor-gadget/inspektor-gadget/pkg/gadget-service"
"github.com/inspektor-gadget/inspektor-gadget/pkg/gadget-service/api"
"github.com/inspektor-gadget/inspektor-gadget/pkg/runtime"
)
func newDaemonCommand(runtime runtime.Runtime) *cobra.Command {
daemonCmd := &cobra.Command{
Use: "daemon",
Short: "Run Inspektor Gadget as a daemon",
Args: cobra.NoArgs,
SilenceUsage: true,
}
var socket string
var group string
var eventBufferLength uint64
daemonCmd.PersistentFlags().StringVarP(
&group,
"group",
"G",
"0",
"Group name or id that the unix socket should use (if daemon-socket is set to e.g. unix:///path/to.socket)")
daemonCmd.PersistentFlags().StringVarP(
&socket,
"host",
"H",
api.DefaultDaemonPath,
"The socket to listen on for new requests. Can be a unix socket"+
" (unix:///path/to.socket) or a tcp socket (tcp://127.0.0.1:1234)")
daemonCmd.PersistentFlags().Uint64VarP(
&eventBufferLength,
"events-buffer-length",
"",
16384,
"The events buffer length. A low value could impact horizontal scaling.")
daemonCmd.RunE = func(cmd *cobra.Command, args []string) error {
if os.Geteuid() != 0 {
return fmt.Errorf("%s must be run as root to be able to run eBPF programs", filepath.Base(os.Args[0]))
}
socketType, socketPath, err := api.ParseSocketAddress(socket)
if err != nil {
return fmt.Errorf("invalid daemon-socket address: %w", err)
}
gid := 0
if tmpGroup, err := user.LookupGroup(group); err == nil {
gid, err = strconv.Atoi(tmpGroup.Gid)
if err != nil {
return fmt.Errorf("unexpected non-numeric group id %q for group %q", tmpGroup.Gid, group)
}
} else if tmpGid, err := strconv.Atoi(group); err == nil {
gid = tmpGid
} else {
return fmt.Errorf("group %q not found", group)
}
log.Infof("starting Inspektor Gadget daemon at %q", socket)
service := gadgetservice.NewService(log.StandardLogger(), eventBufferLength)
return service.Run(gadgetservice.RunConfig{
SocketType: socketType,
SocketPath: socketPath,
SocketGID: gid,
})
}
return daemonCmd
}