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has a websocket shell now!

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This commit is contained in:
Zhi Wang 2022-01-05 12:38:52 -05:00
parent aa283ec188
commit db2741e1be
4 changed files with 90 additions and 4 deletions
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2
assets/main.js
View File

@ -31,7 +31,7 @@ function createTerminal() {
});
term.open(document.getElementById('terminal_view'));
term.resize(120, 36);
term.resize(122, 37);
const weblinksAddon = new WebLinksAddon.WebLinksAddon();
term.loadAddon(weblinksAddon);

4
go.mod
View File

@ -3,6 +3,7 @@ module github.com/syssecfsu/wsterm
go 1.17
require (
github.com/creack/pty v1.1.17 // indirect
github.com/gin-contrib/sse v0.1.0 // indirect
github.com/gin-gonic/gin v1.7.7 // indirect
github.com/go-playground/locales v0.13.0 // indirect
@ -17,6 +18,7 @@ require (
github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 // indirect
github.com/ugorji/go/codec v1.1.7 // indirect
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 // indirect
golang.org/x/sys v0.0.0-20200116001909-b77594299b42 // indirect
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
gopkg.in/yaml.v2 v2.2.8 // indirect
)

6
go.sum
View File

@ -1,3 +1,5 @@
github.com/creack/pty v1.1.17 h1:QeVUsEDNrLBW4tMgZHvxy18sKtr6VI492kBhUfhDJNI=
github.com/creack/pty v1.1.17/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
@ -42,6 +44,10 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200116001909-b77594299b42 h1:vEOn+mP2zCOVzKckCZy6YsCtDblrpj/w7B9nxGNELpg=
golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 h1:SrN+KX8Art/Sf4HNj6Zcz06G7VEz+7w9tdXTPOZ7+l4=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

82
main.go
View File

@ -8,8 +8,45 @@ import (
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
"os"
"os/exec"
"github.com/creack/pty"
"golang.org/x/term"
)
func createPty(cmdline string) (*os.File, *term.State, error) {
// Create a shell command.
cmd := exec.Command(cmdline)
// Start the command with a pty.
ptmx, err := pty.Start(cmd)
if err != nil {
return nil, nil, err
}
// Use fixed size, the xterm is initalized as 122x37,
// But we set pty to 120x36. Using fullsize will lead
// some program to misbehaive.
pty.Setsize(ptmx, &pty.Winsize{
Cols: 120,
Rows: 36,
})
// Set stdin in raw mode. This might cause problems in ssh.
// ignore the error if it so happens
termState, err := term.MakeRaw(int(os.Stdin.Fd()))
if err != nil {
fmt.Println(err)
return ptmx, nil, err
}
return ptmx, termState, nil
}
var host *string = nil
var upgrader = websocket.Upgrader{
@ -42,15 +79,56 @@ func wsHandler(w http.ResponseWriter, r *http.Request) {
fmt.Println("Created the websocket")
ptmx, termState, err := createPty("bash")
defer func() {
//close the terminal and restore the terminal state
if termState != nil {
term.Restore(int(os.Stdin.Fd()), termState)
}
}()
if err != nil {
fmt.Println("failed to create PTY", err)
return
}
// pipe the msgs from WS to pty, we need to use goroutine here
go func() {
for {
_, buf, err := conn.ReadMessage()
if err != nil {
fmt.Println(err)
// We need to close pty so the goroutine and this one can end
// using defer will cause problems
ptmx.Close()
return
}
_, err = ptmx.Write(buf)
if err != nil {
fmt.Println(err)
ptmx.Close()
return
}
}
}()
readBuf := make([]byte, 4096)
for {
msgType, p, err := conn.ReadMessage()
n, err := ptmx.Read(readBuf)
if err != nil {
fmt.Println(err)
ptmx.Close()
return
}
if err := conn.WriteMessage(msgType, p); err != nil {
if err = conn.WriteMessage(websocket.BinaryMessage, readBuf[:n]); err != nil {
ptmx.Close()
fmt.Println(err)
return
}