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readline.go
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readline.go
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package console
import (
"fmt"
"io"
"os"
"syscall"
"github.com/alecthomas/kong"
"github.com/chzyer/readline"
shellwords "github.com/mattn/go-shellwords"
cliState "github.com/hideckies/hermit/pkg/client/state"
"github.com/hideckies/hermit/pkg/common/parser"
"github.com/hideckies/hermit/pkg/common/stdin"
"github.com/hideckies/hermit/pkg/common/stdout"
"github.com/hideckies/hermit/pkg/common/utils"
"github.com/hideckies/hermit/pkg/server/state"
)
func Readline(serverState *state.ServerState) {
// Wait for the RPC server starts to avoid the prompt displays before the "C2 server started" message.
<-serverState.Job.ChServerStarted
ri, err := stdin.InitReadline(false, "/tmp/readline.tmp")
if err != nil {
stdout.LogFailed(fmt.Sprint(err))
os.Exit(1)
}
defer ri.Close()
ri.CaptureExitSignal()
// This is only used for passing the ctx.Run function as argument.
clientState := cliState.NewClientState(nil)
isAgentMode := false
var currentParser *kong.Kong
for {
isAgentMode = serverState.AgentMode.Name != ""
// Make prompt
var p string
if !isAgentMode {
p = stdin.MakePrompt("", "")
} else {
p = stdin.MakePrompt("", serverState.AgentMode.Name)
}
ri.SetPrompt(p)
// Set parser
if isAgentMode {
currentParser, err = parser.NewParser(
&parser.GrammarAgentMode{},
serverState.Conf.Host,
serverState.Conf.Domains,
)
if err != nil {
stdout.LogFailed(fmt.Sprintf("Parse Error: %s", err))
break
}
} else {
currentParser, err = parser.NewParser(
&parser.GrammarRoot{},
serverState.Conf.Host,
serverState.Conf.Domains,
)
if err != nil {
stdout.LogFailed(fmt.Sprintf("Parse Error: %s", err))
break
}
}
serverState.Parser = currentParser
// Read input
line, err := ri.Readline()
if err == readline.ErrInterrupt {
if len(line) == 0 {
break
} else {
continue
}
} else if err == io.EOF {
break
}
// Remove redundant spaces
line = utils.StandardizeSpaces(line)
args, err := shellwords.Parse(line)
if err != nil {
stdout.LogFailed(fmt.Sprint(err))
continue
}
ctx, err := serverState.Parser.Parse(args)
if err != nil {
if err, ok := err.(*kong.ParseError); ok {
stdout.LogFailed(err.Error())
stdout.LogInfo("Run 'help <command>' for usage.")
}
continue
}
err = ctx.Run(ctx, serverState, clientState)
if err != nil {
stdout.LogFailed(fmt.Sprint(err))
continue
}
if !serverState.Continue {
break
}
}
serverState.Job.ChQuit <- syscall.SIGINT
}