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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
//go:build !windows
package vmimpl
import (
"fmt"
"io"
"os/exec"
"sync"
"syscall"
"github.com/google/syzkaller/pkg/osutil"
"golang.org/x/sys/unix"
)
// Tested on Suzy-Q and BeagleBone.
func OpenConsole(con string) (rc io.ReadCloser, err error) {
fd, err := syscall.Open(con, syscall.O_RDONLY|syscall.O_NOCTTY|syscall.O_SYNC, 0)
if err != nil {
return nil, fmt.Errorf("failed to open console file: %w", err)
}
defer func() {
if fd != -1 {
syscall.Close(fd)
}
}()
term, err := unix.IoctlGetTermios(fd, syscallTCGETS)
if err != nil {
return nil, fmt.Errorf("failed to get console termios: %w", err)
}
// No parity bit, only need 1 stop bit, no hardware flowcontrol,
term.Cflag &^= unixCBAUD | unix.CSIZE | unix.PARENB | unix.CSTOPB | unixCRTSCTS
// Ignore modem controls.
term.Cflag |= unix.B115200 | unix.CS8 | unix.CLOCAL | unix.CREAD
// Setup for non-canonical mode.
term.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR |
unix.IGNCR | unix.ICRNL | unix.IXON
term.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN
term.Oflag &^= unix.OPOST
term.Cc[unix.VMIN] = 0
term.Cc[unix.VTIME] = 10 // 1 second timeout
if err = unix.IoctlSetTermios(fd, syscallTCSETS, term); err != nil {
return nil, fmt.Errorf("failed to get console termios: %w", err)
}
tmp := fd
fd = -1
return &tty{fd: tmp}, nil
}
type tty struct {
mu sync.Mutex
fd int
}
func (t *tty) Read(buf []byte) (int, error) {
t.mu.Lock()
defer t.mu.Unlock()
if t.fd == -1 {
return 0, io.EOF
}
n, err := syscall.Read(t.fd, buf)
return max(n, 0), err
}
func (t *tty) Close() error {
t.mu.Lock()
defer t.mu.Unlock()
if t.fd != -1 {
syscall.Close(t.fd)
t.fd = -1
}
return nil
}
// OpenRemoteKernelLog accesses to the host where Android VM runs on, not Android VM itself.
// The host stores all kernel outputs of Android VM so in case of crashes nothing will be lost.
func OpenRemoteKernelLog(ip, console string) (rc io.ReadCloser, err error) {
conAddr := "vsoc-01@" + ip
args := []string{
conAddr,
"tail",
"-f",
console,
}
return OpenConsoleByCmd("ssh", args)
}
// Open dmesg remotely.
func OpenRemoteConsole(bin string, args ...string) (rc io.ReadCloser, err error) {
args = append(args, "dmesg -w")
return OpenConsoleByCmd(bin, args)
}
// OpenAdbConsole provides fallback console output using 'adb shell dmesg -w'.
func OpenAdbConsole(bin, dev string) (rc io.ReadCloser, err error) {
return OpenRemoteConsole(bin, "-s", dev, "shell")
}
// Open console log by cmd.
func OpenConsoleByCmd(bin string, args []string) (rc io.ReadCloser, err error) {
rpipe, wpipe, err := osutil.LongPipe()
if err != nil {
return nil, err
}
cmd := osutil.Command(bin, args...)
cmd.Stdout = wpipe
cmd.Stderr = wpipe
if _, err := cmd.StdinPipe(); err != nil {
rpipe.Close()
wpipe.Close()
return nil, err
}
if err := cmd.Start(); err != nil {
rpipe.Close()
wpipe.Close()
return nil, fmt.Errorf("failed to open console: %w", err)
}
wpipe.Close()
con := &remoteCon{
cmd: cmd,
rpipe: rpipe,
}
return con, err
}
type remoteCon struct {
closeMu sync.Mutex
readMu sync.Mutex
cmd *exec.Cmd
rpipe io.ReadCloser
}
func (t *remoteCon) Read(buf []byte) (int, error) {
t.readMu.Lock()
n, err := t.rpipe.Read(buf)
t.readMu.Unlock()
return n, err
}
func (t *remoteCon) Close() error {
t.closeMu.Lock()
cmd := t.cmd
t.cmd = nil
t.closeMu.Unlock()
if cmd == nil {
return nil
}
cmd.Process.Kill()
t.readMu.Lock()
t.rpipe.Close()
t.readMu.Unlock()
cmd.Process.Wait()
return nil
}
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