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package daemon
import (
"bufio"
"fmt"
"github.com/subgraph/oz"
"github.com/subgraph/oz/fs"
"github.com/subgraph/oz/xpra"
"io"
"os"
"os/exec"
"os/user"
"path"
"sync"
"syscall"
)
const initPath = "/usr/local/bin/oz-init"
type Sandbox struct {
daemon *daemonState
id int
display int
profile *oz.Profile
init *exec.Cmd
cred *syscall.Credential
fs *fs.Filesystem
stderr io.ReadCloser
addr string
xpra *xpra.Xpra
ready sync.WaitGroup
}
/*
func findSandbox(id int) *Sandbox {
for _, sb := range sandboxes {
if sb.id == id {
return sb
}
}
return nil
}
*/
const initCloneFlags = syscall.CLONE_NEWNS | syscall.CLONE_NEWIPC | syscall.CLONE_NEWPID | syscall.CLONE_NEWUTS | syscall.CLONE_NEWNET
func createInitCommand(name, chroot string, uid uint32, display int) *exec.Cmd {
cmd := exec.Command(initPath)
cmd.Dir = "/"
cmd.SysProcAttr = &syscall.SysProcAttr{
Chroot: chroot,
Cloneflags: initCloneFlags,
}
cmd.Env = []string{
"INIT_PROFILE=" + name,
fmt.Sprintf("INIT_UID=%d", uid),
}
if display > 0 {
cmd.Env = append(cmd.Env, fmt.Sprintf("INIT_DISPLAY=%d", display))
}
return cmd
}
func (d *daemonState) launch(p *oz.Profile, uid, gid uint32) (*Sandbox, error) {
u, err := user.LookupId(fmt.Sprintf("%d", uid))
if err != nil {
return nil, fmt.Errorf("failed to lookup user for uid=%d: %v", uid, err)
}
fs := fs.NewFromProfile(p, u, d.log)
if err := fs.Setup(); err != nil {
return nil, err
}
display := 0
if p.XServer.Enabled {
display = d.nextDisplay
d.nextDisplay += 1
}
cmd := createInitCommand(p.Name, fs.Root(), uid, display)
pp, err := cmd.StderrPipe()
if err != nil {
fs.Cleanup()
return nil, fmt.Errorf("error creating stderr pipe for init process: %v", err)
}
if err := cmd.Start(); err != nil {
fs.Cleanup()
return nil, err
}
sbox := &Sandbox{
daemon: d,
id: d.nextSboxId,
display: display,
profile: p,
init: cmd,
cred: &syscall.Credential{Uid: uid, Gid: gid},
fs: fs,
addr: path.Join(fs.Root(), "tmp", "oz-init-control"),
stderr: pp,
}
sbox.ready.Add(1)
go sbox.logMessages()
if sbox.profile.XServer.Enabled {
go func() {
sbox.ready.Wait()
go sbox.startXpraClient()
}()
}
d.nextSboxId += 1
d.sandboxes = append(d.sandboxes, sbox)
return sbox, nil
}
func (sbox *Sandbox) remove() {
sboxes := []*Sandbox{}
for _, sb := range sbox.daemon.sandboxes {
if sb == sbox {
sb.fs.Cleanup()
} else {
sboxes = append(sboxes, sb)
}
}
sbox.daemon.sandboxes = sboxes
}
func (sbox *Sandbox) logMessages() {
scanner := bufio.NewScanner(sbox.stderr)
seenOk := false
for scanner.Scan() {
line := scanner.Text()
if line == "OK" && !seenOk {
sbox.daemon.log.Info("oz-init (%s) is ready", sbox.profile.Name)
seenOk = true
sbox.ready.Done()
} else if len(line) > 1 {
sbox.logLine(line)
}
}
sbox.stderr.Close()
}
func (sbox *Sandbox) logLine(line string) {
if len(line) < 2 {
return
}
f := sbox.getLogFunc(line[0])
msg := line[2:]
if f != nil {
f("[%s] %s", sbox.profile.Name, msg)
} else {
sbox.daemon.log.Info("[%s] %s", sbox.profile.Name, line)
}
}
func (sbox *Sandbox) getLogFunc(c byte) func(string, ...interface{}) {
log := sbox.daemon.log
switch c {
case 'D':
return log.Debug
case 'I':
return log.Info
case 'N':
return log.Notice
case 'W':
return log.Warning
case 'E':
return log.Error
case 'C':
return log.Critical
}
return nil
}
func (sbox *Sandbox) startXpraClient() {
sbox.xpra = xpra.NewClient(
&sbox.profile.XServer,
uint64(sbox.display),
sbox.cred,
sbox.fs.Xpra(),
sbox.profile.Name,
sbox.daemon.log)
sbox.xpra.Process.Stdout = os.Stdout
sbox.xpra.Process.Stderr = os.Stdout
if err := sbox.xpra.Process.Start(); err != nil {
sbox.daemon.Warning("Failed to start xpra client: %v", err)
}
}