package daemon import ( "github.com/subgraph/oz" "github.com/subgraph/oz/fs" "os/exec" "github.com/subgraph/oz/ipc" "syscall" "fmt" "io" "bufio" "os/user" ) const initPath = "/usr/local/bin/oz-init" type Sandbox struct { daemon *daemonState id int display int profile *oz.Profile init *exec.Cmd fs *fs.Filesystem stderr io.ReadCloser addr string } /* 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 func createInitCommand(addr, 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_ADDRESS="+addr, "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 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 } addr,err := ipc.CreateRandomAddress("@oz-init-") if err != nil { return nil, err } display := 0 if p.XServer.Enabled { display = d.nextDisplay d.nextDisplay += 1 } cmd := createInitCommand(addr, 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, fs: fs, addr: addr, stderr: pp, } go sbox.logMessages() 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) for scanner.Scan() { line := scanner.Text() if line == "XPRA READY" { sbox.daemon.log.Info("Xpra server is ready for connection") } 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 }