mirror of
https://github.com/golang/go
synced 2024-11-21 18:34:44 -07:00
syscall: StartProcess fixes for windows
- StartProcess will work with relative (to attr.Dir, not current directory) executable filenames - StartProcess will only work if executable filename points to the real file, it will not search for executable in the $PATH list and others (see CreateProcess manual for details) - StartProcess argv strings can contain any characters R=golang-dev, r CC=golang-dev https://golang.org/cl/4306041
This commit is contained in:
Alex Brainman
parent
eccf31b744
commit
913c8d7397
@ -118,3 +118,55 @@ func TestAddEnvVar(t *testing.T) {
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t.Fatal("close:", err)
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}
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}
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var tryargs = []string{
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`2`,
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`2 `,
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"2 \t",
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`2" "`,
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`2 ab `,
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`2 "ab" `,
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`2 \ `,
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`2 \\ `,
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`2 \" `,
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`2 \`,
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`2\`,
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`2"`,
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`2\"`,
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`2 "`,
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`2 \"`,
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``,
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`2 ^ `,
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`2 \^`,
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}
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func TestArgs(t *testing.T) {
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for _, a := range tryargs {
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argv := []string{
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"awk",
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`BEGIN{printf("%s|%s|%s",ARGV[1],ARGV[2],ARGV[3])}`,
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"/dev/null",
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a,
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"EOF",
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}
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exe, err := LookPath(argv[0])
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if err != nil {
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t.Fatal("run:", err)
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}
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cmd, err := Run(exe, argv, nil, "", DevNull, Pipe, DevNull)
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if err != nil {
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t.Fatal("run:", err)
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}
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buf, err := ioutil.ReadAll(cmd.Stdout)
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if err != nil {
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t.Fatal("read:", err)
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}
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expect := "/dev/null|" + a + "|EOF"
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if string(buf) != expect {
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t.Errorf("read: got %q expect %q", buf, expect)
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}
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if err = cmd.Close(); err != nil {
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t.Fatal("close:", err)
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}
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}
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}
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@ -10,6 +10,7 @@ import (
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"io"
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"io/ioutil"
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. "os"
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"path/filepath"
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"strings"
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"syscall"
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"testing"
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@ -409,25 +410,12 @@ func TestRename(t *testing.T) {
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}
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}
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func TestStartProcess(t *testing.T) {
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var cmd, expect string
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var args []string
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func exec(t *testing.T, dir, cmd string, args []string, expect string) {
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r, w, err := Pipe()
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if err != nil {
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t.Fatalf("Pipe: %v", err)
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}
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attr := &ProcAttr{Files: []*File{nil, w, Stderr}}
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if syscall.OS == "windows" {
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cmd = Getenv("COMSPEC")
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args = []string{Getenv("COMSPEC"), "/c cd"}
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attr.Dir = Getenv("SystemRoot")
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expect = Getenv("SystemRoot") + "\r\n"
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} else {
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cmd = "/bin/pwd"
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args = []string{"pwd"}
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attr.Dir = "/"
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expect = "/\n"
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}
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attr := &ProcAttr{Dir: dir, Files: []*File{nil, w, Stderr}}
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p, err := StartProcess(cmd, args, attr)
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if err != nil {
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t.Fatalf("StartProcess: %v", err)
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@ -439,12 +427,34 @@ func TestStartProcess(t *testing.T) {
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io.Copy(&b, r)
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output := b.String()
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if output != expect {
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args[0] = cmd
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t.Errorf("exec %q returned %q wanted %q", strings.Join(args, " "), output, expect)
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t.Errorf("exec %q returned %q wanted %q",
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strings.Join(append([]string{cmd}, args...), " "), output, expect)
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}
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p.Wait(0)
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}
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func TestStartProcess(t *testing.T) {
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var dir, cmd, le string
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var args []string
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if syscall.OS == "windows" {
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le = "\r\n"
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cmd = Getenv("COMSPEC")
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dir = Getenv("SystemRoot")
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args = []string{"/c", "cd"}
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} else {
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le = "\n"
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cmd = "/bin/pwd"
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dir = "/"
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args = []string{}
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}
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cmddir, cmdbase := filepath.Split(cmd)
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args = append([]string{cmdbase}, args...)
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// Test absolute executable path.
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exec(t, dir, cmd, args, dir+le)
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// Test relative executable path.
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exec(t, cmddir, cmdbase, args, filepath.Clean(cmddir)+le)
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}
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func checkMode(t *testing.T, path string, mode uint32) {
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dir, err := Stat(path)
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if err != nil {
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@ -11,48 +11,92 @@ import (
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"utf16"
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)
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// Windows doesn't have a good concept of just Exec in the documented API.
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// However, the kernel32 CreateProcess does a good job with
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// ForkExec.
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var ForkLock sync.RWMutex
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// Joins an array of string with sep
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// From the "strings" package. Modified.
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func stringJoin(a []string, sep string, escape escapeFunc) string {
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if len(a) == 0 {
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return ""
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// escape rewrites command line argument s as prescribed
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// in http://msdn.microsoft.com/en-us/library/ms880421.
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// This function returns "" (2 double quotes) if s is empty.
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// Alternatively, these transformations are done:
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// - every back slash (\) is doubled, but only if immediately
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// followed by double quote (");
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// - every double quote (") is escaped by back slash (\);
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// - finally, s is wrapped with double quotes (arg -> "arg"),
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// but only if there is space or tab inside s.
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func escape(s string) string {
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if len(s) == 0 {
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return "\"\""
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}
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if len(a) == 1 {
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return a[0]
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n := len(s)
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hasSpace := false
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for i := 0; i < len(s); i++ {
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switch s[i] {
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case '"', '\\':
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n++
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case ' ', '\t':
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hasSpace = true
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}
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}
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n := len(sep) * (len(a) - 1)
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for i := 0; i < len(a); i++ {
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a[i] = escape(a[i])
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n += len(a[i])
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if hasSpace {
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n += 2
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}
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if n == len(s) {
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return s
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}
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b := make([]byte, n)
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bp := 0
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for i := 0; i < len(a); i++ {
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s := a[i]
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for j := 0; j < len(s); j++ {
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b[bp] = s[j]
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bp++
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}
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if i+1 < len(a) {
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s = sep
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for j := 0; j < len(s); j++ {
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b[bp] = s[j]
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bp++
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}
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}
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qs := make([]byte, n)
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j := 0
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if hasSpace {
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qs[j] = '"'
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j++
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}
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return string(b)
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slashes := 0
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for i := 0; i < len(s); i++ {
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switch s[i] {
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default:
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slashes = 0
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qs[j] = s[i]
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case '\\':
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slashes++
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qs[j] = s[i]
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case '"':
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for ; slashes > 0; slashes-- {
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qs[j] = '\\'
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j++
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}
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qs[j] = '\\'
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j++
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qs[j] = s[i]
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}
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j++
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}
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if hasSpace {
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for ; slashes > 0; slashes-- {
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qs[j] = '\\'
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j++
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}
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qs[j] = '"'
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j++
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}
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return string(qs[:j])
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}
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//Env block is a sequence of null terminated strings followed by a null.
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//Last bytes are two unicode nulls, or four null bytes.
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// makeCmdLine builds a command line out of args by escaping "special"
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// characters and joining the arguments with spaces.
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func makeCmdLine(args []string) string {
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var s string
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for _, v := range args {
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if s != "" {
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s += " "
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}
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s += escape(v)
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}
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return s
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}
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// createEnvBlock converts an array of environment strings into
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// the representation required by CreateProcess: a sequence of NUL
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// terminated strings followed by a nil.
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// Last bytes are two UCS-2 NULs, or four NUL bytes.
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func createEnvBlock(envv []string) *uint16 {
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if len(envv) == 0 {
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return &utf16.Encode([]int("\x00\x00"))[0]
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@ -76,36 +120,6 @@ func createEnvBlock(envv []string) *uint16 {
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return &utf16.Encode([]int(string(b)))[0]
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}
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type escapeFunc func(s string) string
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//escapes quotes by " -> ""
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//Also string -> "string"
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func escapeAddQuotes(s string) string {
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//normal ascii char, one byte wide
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rune := byte('"')
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l := len(s)
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n := 0
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for i := 0; i < l; i++ {
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if s[i] == rune {
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n++
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}
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}
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qs := make([]byte, l+n+2)
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qs[0] = rune
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j := 1
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for i := 0; i < l; i++ {
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qs[i+j] = s[i]
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if s[i] == rune {
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j++
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qs[i+j] = rune
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}
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}
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qs[len(qs)-1] = rune
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return string(qs)
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}
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func CloseOnExec(fd int) {
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SetHandleInformation(int32(fd), HANDLE_FLAG_INHERIT, 0)
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}
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@ -114,6 +128,94 @@ func SetNonblock(fd int, nonblocking bool) (errno int) {
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return 0
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}
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// getFullPath retrieves the full path of the specified file.
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// Just a wrapper for Windows GetFullPathName api.
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func getFullPath(name string) (path string, err int) {
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p := StringToUTF16Ptr(name)
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buf := make([]uint16, 100)
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n, err := GetFullPathName(p, uint32(len(buf)), &buf[0], nil)
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if err != 0 {
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return "", err
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}
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if n > uint32(len(buf)) {
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// Windows is asking for bigger buffer.
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buf = make([]uint16, n)
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n, err = GetFullPathName(p, uint32(len(buf)), &buf[0], nil)
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if err != 0 {
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return "", err
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}
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if n > uint32(len(buf)) {
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return "", EINVAL
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}
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}
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return UTF16ToString(buf[:n]), 0
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}
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func isSlash(c uint8) bool {
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return c == '\\' || c == '/'
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}
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func normalizeDir(dir string) (name string, err int) {
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ndir, err := getFullPath(dir)
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if err != 0 {
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return "", err
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}
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if len(ndir) > 2 && isSlash(ndir[0]) && isSlash(ndir[1]) {
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// dir cannot have \\server\share\path form
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return "", EINVAL
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}
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return ndir, 0
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}
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func volToUpper(ch int) int {
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if 'a' <= ch && ch <= 'z' {
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ch += 'A' - 'a'
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}
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return ch
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}
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func joinExeDirAndFName(dir, p string) (name string, err int) {
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if len(p) == 0 {
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return "", EINVAL
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}
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if len(p) > 2 && isSlash(p[0]) && isSlash(p[1]) {
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// \\server\share\path form
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return p, 0
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}
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if len(p) > 1 && p[1] == ':' {
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// has drive letter
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if len(p) == 2 {
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return "", EINVAL
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}
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if isSlash(p[2]) {
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return p, 0
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} else {
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d, err := normalizeDir(dir)
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if err != 0 {
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return "", err
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}
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if volToUpper(int(p[0])) == volToUpper(int(d[0])) {
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return getFullPath(d + "\\" + p[2:])
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} else {
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return getFullPath(p)
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}
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}
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} else {
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// no drive letter
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d, err := normalizeDir(dir)
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if err != 0 {
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return "", err
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}
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if isSlash(p[0]) {
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return getFullPath(d[:2] + p)
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} else {
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return getFullPath(d + "\\" + p)
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}
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}
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// we shouldn't be here
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return "", EINVAL
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}
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type ProcAttr struct {
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Dir string
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Env []string
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@ -122,9 +224,10 @@ type ProcAttr struct {
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var zeroAttributes ProcAttr
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// TODO(kardia): Add trace
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//The command and arguments are passed via the Command line parameter.
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func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid, handle int, err int) {
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if len(argv0) == 0 {
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return 0, 0, EWINDOWS
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}
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if attr == nil {
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attr = &zeroAttributes
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}
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@ -132,25 +235,31 @@ func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid, handle int,
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return 0, 0, EWINDOWS
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}
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// CreateProcess will throw an error if the dir is not set to a valid dir
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// thus get the working dir if dir is empty.
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dir := attr.Dir
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if dir == "" {
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if wd, ok := Getwd(); ok == 0 {
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dir = wd
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if len(attr.Dir) != 0 {
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// StartProcess assumes that argv0 is relative to attr.Dir,
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// because it implies Chdir(attr.Dir) before executing argv0.
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// Windows CreateProcess assumes the opposite: it looks for
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// argv0 relative to the current directory, and, only once the new
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// process is started, it does Chdir(attr.Dir). We are adjusting
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// for that difference here by making argv0 absolute.
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var err int
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argv0, err = joinExeDirAndFName(attr.Dir, argv0)
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if err != 0 {
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return 0, 0, err
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}
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}
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fd := attr.Files
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argv0p := StringToUTF16Ptr(argv0)
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startupInfo := new(StartupInfo)
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processInfo := new(ProcessInformation)
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var argvp *uint16
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s := makeCmdLine(argv)
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if len(s) != 0 {
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argvp = StringToUTF16Ptr(s)
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}
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GetStartupInfo(startupInfo)
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startupInfo.Flags = STARTF_USESTDHANDLES
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startupInfo.StdInput = 0
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startupInfo.StdOutput = 0
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startupInfo.StdErr = 0
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var dirp *uint16
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if len(attr.Dir) != 0 {
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dirp = StringToUTF16Ptr(attr.Dir)
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}
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|
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// Acquire the fork lock so that no other threads
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// create new fds that are not yet close-on-exec
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@ -158,54 +267,35 @@ func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid, handle int,
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ForkLock.Lock()
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defer ForkLock.Unlock()
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var currentProc, _ = GetCurrentProcess()
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if len(fd) > 0 && fd[0] > 0 {
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err := DuplicateHandle(currentProc, int32(fd[0]), currentProc, &startupInfo.StdInput, 0, true, DUPLICATE_SAME_ACCESS)
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if err != 0 {
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return 0, 0, err
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p, _ := GetCurrentProcess()
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fd := make([]int32, len(attr.Files))
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for i, _ := range attr.Files {
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if attr.Files[i] > 0 {
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err := DuplicateHandle(p, int32(attr.Files[i]), p, &fd[i], 0, true, DUPLICATE_SAME_ACCESS)
|
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if err != 0 {
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return 0, 0, err
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}
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defer CloseHandle(int32(fd[i]))
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}
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defer CloseHandle(int32(startupInfo.StdInput))
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}
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if len(fd) > 1 && fd[1] > 0 {
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err := DuplicateHandle(currentProc, int32(fd[1]), currentProc, &startupInfo.StdOutput, 0, true, DUPLICATE_SAME_ACCESS)
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if err != 0 {
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return 0, 0, err
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}
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defer CloseHandle(int32(startupInfo.StdOutput))
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}
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if len(fd) > 2 && fd[2] > 0 {
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err := DuplicateHandle(currentProc, int32(fd[2]), currentProc, &startupInfo.StdErr, 0, true, DUPLICATE_SAME_ACCESS)
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if err != 0 {
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return 0, 0, err
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}
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defer CloseHandle(int32(startupInfo.StdErr))
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}
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if len(argv) == 0 {
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argv = []string{""}
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}
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// argv0 must not be longer then 256 chars
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// but the entire cmd line can have up to 32k chars (msdn)
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err = CreateProcess(
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nil,
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StringToUTF16Ptr(escapeAddQuotes(argv0)+" "+stringJoin(argv[1:], " ", escapeAddQuotes)),
|
||||
nil, //ptr to struct lpProcessAttributes
|
||||
nil, //ptr to struct lpThreadAttributes
|
||||
true, //bInheritHandles
|
||||
CREATE_UNICODE_ENVIRONMENT, //Flags
|
||||
createEnvBlock(attr.Env), //env block, NULL uses parent env
|
||||
StringToUTF16Ptr(dir),
|
||||
startupInfo,
|
||||
processInfo)
|
||||
si := new(StartupInfo)
|
||||
GetStartupInfo(si)
|
||||
si.Flags = STARTF_USESTDHANDLES
|
||||
si.StdInput = fd[0]
|
||||
si.StdOutput = fd[1]
|
||||
si.StdErr = fd[2]
|
||||
|
||||
if err == 0 {
|
||||
pid = int(processInfo.ProcessId)
|
||||
handle = int(processInfo.Process)
|
||||
CloseHandle(processInfo.Thread)
|
||||
pi := new(ProcessInformation)
|
||||
|
||||
err = CreateProcess(argv0p, argvp, nil, nil, true, CREATE_UNICODE_ENVIRONMENT, createEnvBlock(attr.Env), dirp, si, pi)
|
||||
if err != 0 {
|
||||
return 0, 0, err
|
||||
}
|
||||
return
|
||||
defer CloseHandle(pi.Thread)
|
||||
|
||||
return int(pi.ProcessId), int(pi.Process), 0
|
||||
}
|
||||
|
||||
// Ordinary exec.
|
||||
func Exec(argv0 string, argv []string, envv []string) (err int) {
|
||||
return EWINDOWS
|
||||
}
|
||||
|
||||
@ -135,7 +135,7 @@ func NewCallback(fn interface{}) uintptr
|
||||
//sys CreateIoCompletionPort(filehandle int32, cphandle int32, key uint32, threadcnt uint32) (handle int32, errno int)
|
||||
//sys GetQueuedCompletionStatus(cphandle int32, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) (errno int)
|
||||
//sys CancelIo(s uint32) (errno int)
|
||||
//sys CreateProcess(appName *int16, commandLine *uint16, procSecurity *int16, threadSecurity *int16, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (errno int) = CreateProcessW
|
||||
//sys CreateProcess(appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (errno int) = CreateProcessW
|
||||
//sys OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle uint32, errno int)
|
||||
//sys GetExitCodeProcess(handle uint32, exitcode *uint32) (errno int)
|
||||
//sys GetStartupInfo(startupInfo *StartupInfo) (errno int) = GetStartupInfoW
|
||||
@ -160,6 +160,7 @@ func NewCallback(fn interface{}) uintptr
|
||||
//sys LocalFree(hmem uint32) (handle uint32, errno int) [failretval!=0]
|
||||
//sys SetHandleInformation(handle int32, mask uint32, flags uint32) (errno int)
|
||||
//sys FlushFileBuffers(handle int32) (errno int)
|
||||
//sys GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, errno int) = kernel32.GetFullPathNameW
|
||||
|
||||
// syscall interface implementation for other packages
|
||||
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
// mksyscall_windows.sh -l32 syscall_windows.go syscall_windows_386.go
|
||||
// mksyscall_windows.pl -l32 syscall_windows.go syscall_windows_386.go
|
||||
// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
|
||||
|
||||
package syscall
|
||||
@ -69,6 +69,7 @@ var (
|
||||
procLocalFree = getSysProcAddr(modkernel32, "LocalFree")
|
||||
procSetHandleInformation = getSysProcAddr(modkernel32, "SetHandleInformation")
|
||||
procFlushFileBuffers = getSysProcAddr(modkernel32, "FlushFileBuffers")
|
||||
procGetFullPathNameW = getSysProcAddr(modkernel32, "GetFullPathNameW")
|
||||
procWSAStartup = getSysProcAddr(modwsock32, "WSAStartup")
|
||||
procWSACleanup = getSysProcAddr(modwsock32, "WSACleanup")
|
||||
procsocket = getSysProcAddr(modwsock32, "socket")
|
||||
@ -515,7 +516,7 @@ func CancelIo(s uint32) (errno int) {
|
||||
return
|
||||
}
|
||||
|
||||
func CreateProcess(appName *int16, commandLine *uint16, procSecurity *int16, threadSecurity *int16, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (errno int) {
|
||||
func CreateProcess(appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (errno int) {
|
||||
var _p0 uint32
|
||||
if inheritHandles {
|
||||
_p0 = 1
|
||||
@ -885,6 +886,21 @@ func FlushFileBuffers(handle int32) (errno int) {
|
||||
return
|
||||
}
|
||||
|
||||
func GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, errno int) {
|
||||
r0, _, e1 := Syscall6(procGetFullPathNameW, 4, uintptr(unsafe.Pointer(path)), uintptr(buflen), uintptr(unsafe.Pointer(buf)), uintptr(unsafe.Pointer(fname)), 0, 0)
|
||||
n = uint32(r0)
|
||||
if n == 0 {
|
||||
if e1 != 0 {
|
||||
errno = int(e1)
|
||||
} else {
|
||||
errno = EINVAL
|
||||
}
|
||||
} else {
|
||||
errno = 0
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func WSAStartup(verreq uint32, data *WSAData) (sockerrno int) {
|
||||
r0, _, _ := Syscall(procWSAStartup, 2, uintptr(verreq), uintptr(unsafe.Pointer(data)), 0)
|
||||
sockerrno = int(r0)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user