forked from genuinetools/bpfps
/
main.go
145 lines (120 loc) · 2.76 KB
/
main.go
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package main
import (
"flag"
"fmt"
"os"
"os/signal"
"strings"
"syscall"
"text/tabwriter"
"time"
"github.com/cilium/cilium/pkg/bpf"
"github.com/genuinetools/bpfps/version"
"github.com/sirupsen/logrus"
)
const (
// BANNER is what is printed for help/info output
BANNER = ` _ __
| |__ _ __ / _|_ __ ___
| '_ \| '_ \| |_| '_ \/ __|
| |_) | |_) | _| |_) \__ \
|_.__/| .__/|_| | .__/|___/
|_| |_|
A tool to list and diagnose bpf programs. (Who watches the watchers..? :)
Version: %s
Build: %s
`
)
var (
debug bool
vrsn bool
)
func init() {
// parse flags
flag.BoolVar(&vrsn, "version", false, "print version and exit")
flag.BoolVar(&vrsn, "v", false, "print version and exit (shorthand)")
flag.BoolVar(&debug, "d", false, "run in debug mode")
flag.Usage = func() {
fmt.Fprint(os.Stderr, fmt.Sprintf(BANNER, version.VERSION, version.GITCOMMIT))
flag.PrintDefaults()
}
flag.Parse()
if vrsn {
fmt.Printf("bpfps version %s, build %s", version.VERSION, version.GITCOMMIT)
os.Exit(0)
}
// set log level
if debug {
logrus.SetLevel(logrus.DebugLevel)
}
// Mount the bpf filesystem.
bpf.MountFS()
}
func main() {
// On ^C, or SIGTERM handle exit.
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
signal.Notify(c, syscall.SIGTERM)
go func() {
for sig := range c {
logrus.Infof("Received %s, exiting.", sig.String())
os.Exit(0)
}
}()
infos := getProgInfos()
if len(infos) <= 0 {
logrus.Fatal("no bpf programs found")
}
// Print the table.
w := tabwriter.NewWriter(os.Stdout, 20, 1, 3, ' ', 0)
// print header
fmt.Fprintln(w, "BID\tNAME\tTYPE\tUID\tMAPS\tLOADTIME")
for _, info := range infos {
dur, _ := time.ParseDuration(fmt.Sprintf("%dns", info.LoadTime))
fmt.Fprintf(w, "%d\t%s\t%s\t%d\t%#v\t%s\n", info.ID, info.Name, bpf.MapType(int(info.ProgType)).String(), info.CreatedByUID, info.MapIDs, dur)
}
w.Flush()
}
func getProgInfos() []bpf.ProgInfo {
var (
bid uint32
err error
infos = []bpf.ProgInfo{}
)
for {
bid, err = bpf.GetProgNextID(bid)
if err != nil {
if !strings.Contains(err.Error(), "no such file or directory") {
logrus.Warn(err)
}
// break on error here
break
}
// Get the file descriptor
fd, err := bpf.GetProgFDByID(bid)
if err != nil {
logrus.Warn(err)
continue
}
// Get the object's info.
info, err := bpf.GetProgInfoByFD(fd)
if err != nil {
logrus.Warn(err)
continue
}
if &info == nil {
logrus.Warnf("No program info returned for fd %d, bid %d", fd, bid)
}
infos = append(infos, info)
}
return infos
}
func usageAndExit(message string, exitCode int) {
if message != "" {
fmt.Fprintf(os.Stderr, message)
fmt.Fprintf(os.Stderr, "\n\n")
}
flag.Usage()
fmt.Fprintf(os.Stderr, "\n")
os.Exit(exitCode)
}