示例#1
0
文件: proc.go 项目: rnd-ua/scope
// walkProcPid walks over all numerical (PID) /proc entries, and sees if their
// ./fd/* files are symlink to sockets. Returns a map from socket ID (inode)
// to PID. Will return an error if /proc isn't there.
func walkProcPid(buf *bytes.Buffer, walker process.Walker) (map[uint64]*Proc, error) {
	var (
		res        = map[uint64]*Proc{}
		namespaces = map[uint64]bool{} // map namespace id -> has connections
		statT      syscall.Stat_t
	)

	walker.Walk(func(p, _ process.Process) {
		dirName := strconv.Itoa(p.PID)
		fdBase := filepath.Join(procRoot, dirName, "fd")

		// Read network namespace, and if we haven't seen it before,
		// read /proc/<pid>/net/tcp
		if err := fs.Lstat(filepath.Join(procRoot, dirName, "/ns/net"), &statT); err != nil {
			return
		}
		hasConns, ok := namespaces[statT.Ino]
		if !ok {
			read, _ := readFile(filepath.Join(procRoot, dirName, "/net/tcp"), buf)
			read6, _ := readFile(filepath.Join(procRoot, dirName, "/net/tcp6"), buf)
			hasConns = read+read6 > 0
			namespaces[statT.Ino] = hasConns
		}
		if !hasConns {
			return
		}

		fds, err := fs.ReadDirNames(fdBase)
		if err != nil {
			// Process is be gone by now, or we don't have access.
			return
		}
		var proc *Proc
		for _, fd := range fds {
			// Direct use of syscall.Stat() to save garbage.
			err = fs.Stat(filepath.Join(fdBase, fd), &statT)
			if err != nil {
				continue
			}

			// We want sockets only.
			if statT.Mode&syscall.S_IFMT != syscall.S_IFSOCK {
				continue
			}
			if proc == nil {
				proc = &Proc{
					PID:  uint(p.PID),
					Name: p.Name,
				}
			}
			res[statT.Ino] = proc
		}
	})

	return res, nil
}
示例#2
0
文件: fs.go 项目: rnd-ua/scope
func (p dir) ReadDirNames(path string) ([]string, error) {
	if path == "/" {
		result := []string{}
		for _, v := range p.entries {
			result = append(result, v.Name())
		}
		return result, nil
	}

	head, tail := split(path)
	fs, ok := p.entries[head]
	if !ok {
		return nil, fmt.Errorf("Not found: %s", path)
	}

	return fs.ReadDirNames(tail)
}
示例#3
0
// Walk walks the supplied directory (expecting it to look like /proc)
// and marshalls the files into instances of Process, which it then
// passes one-by-one to the supplied function. Walk is only made public
// so that is can be tested.
func (w *walker) Walk(f func(Process, Process)) error {
	dirEntries, err := fs.ReadDirNames(w.procRoot)
	if err != nil {
		return err
	}

	for _, filename := range dirEntries {
		pid, err := strconv.Atoi(filename)
		if err != nil {
			continue
		}

		ppid, threads, jiffies, rss, err := readStats(path.Join(w.procRoot, filename, "stat"))
		if err != nil {
			continue
		}

		cmdline, name := "", "(unknown)"
		if cmdlineBuf, err := cachedReadFile(path.Join(w.procRoot, filename, "cmdline")); err == nil {
			// like proc, treat name as the first element of command line
			i := bytes.IndexByte(cmdlineBuf, '\000')
			if i == -1 {
				i = len(cmdlineBuf)
			}
			name = string(cmdlineBuf[:i])
			cmdlineBuf = bytes.Replace(cmdlineBuf, []byte{'\000'}, []byte{' '}, -1)
			cmdline = string(cmdlineBuf)
		}

		f(Process{
			PID:      pid,
			PPID:     ppid,
			Name:     name,
			Cmdline:  cmdline,
			Threads:  threads,
			Jiffies:  jiffies,
			RSSBytes: rss,
		}, Process{})
	}

	return nil
}