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args.go
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args.go
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package main
import (
"flag"
"fmt"
"net/http"
"net/url"
"regexp"
"strings"
"github.com/glebarez/padre/pkg/color"
"github.com/glebarez/padre/pkg/encoder"
"github.com/glebarez/padre/pkg/util"
)
func init() {
// a custom usage message
flag.Usage = func() {
fmt.Fprint(stderr, usage)
}
}
const (
defaultConcurrency = 30
defaultTerminalWidth = 80
maxConcurrency = 256
)
// Args - CLI flags
type Args struct {
BlockLen *int
Parallel *int
TargetURL *string
Encoder encoder.Encoder
PaddingErrorPattern *string
ProxyURL *url.URL
POSTdata *string
ContentType *string
Cookies []*http.Cookie
EncryptMode *bool
Input *string
}
func parseArgs() (*Args, *argErrors) {
// container for storing errors and warnings
argErrs := newArgErrors()
args := &Args{}
// simple flags that go in as-is
args.PaddingErrorPattern = flag.String("err", "", "")
args.BlockLen = flag.Int("b", 0, "")
args.Parallel = flag.Int("p", defaultConcurrency, "")
args.POSTdata = flag.String("post", "", "")
args.ContentType = flag.String("ct", "", "")
args.EncryptMode = flag.Bool("enc", false, "")
args.TargetURL = flag.String("u", "", "")
// flags that need additional processing
proxyURL := flag.String("proxy", "", "")
encoding := flag.String("e", "b64", "")
replacements := flag.String("r", "", "")
cookies := flag.String("cookie", "", "")
// parse flags
flag.Parse()
// general check on URL, POSTdata or Cookies for having the $ placeholder
match1, err := regexp.MatchString(`\$`, *args.TargetURL)
if err != nil {
argErrs.flagError("-u", err)
}
match2, err := regexp.MatchString(`\$`, *args.POSTdata)
if err != nil {
argErrs.flagError("-post", err)
}
match3, err := regexp.MatchString(`\$`, *cookies)
if err != nil {
argErrs.flagError("-cookie", err)
}
if !(match1 || match2 || match3) {
argErrs.flagErrorf("-u, -post, -cookie", "Either URL, POST data or Cookie must contain the $ placeholder")
}
// Target URL
if *args.TargetURL == "" {
argErrs.flagErrorf("-u", "Must be specified")
} else {
_, err = url.Parse(*args.TargetURL)
if err != nil {
argErrs.flagError("-u", fmt.Errorf("failed to parse URL: %w", err))
}
}
// Proxy URL
if *proxyURL != "" {
args.ProxyURL, err = url.Parse(*proxyURL)
if err != nil {
argErrs.flagError("-proxy", fmt.Errorf("failed to parse URL: %w", err))
}
}
// Encoder (With replacements)
if len(*replacements)%2 == 1 {
argErrs.flagErrorf("-r", "String must be of even length (0,2,4, etc.)")
} else {
switch strings.ToLower(*encoding) {
case "b64":
args.Encoder = encoder.NewB64encoder(*replacements)
case "lhex":
args.Encoder = encoder.NewLHEXencoder(*replacements)
default:
argErrs.flagErrorf("-e", "Unsupported encoding specified")
}
}
// block length
switch *args.BlockLen {
case 0: // = not set
case 8:
case 16:
case 32:
default:
argErrs.flagErrorf("-b", "Unsupported value passed. Omit, or specify one of: 8, 16, 32")
}
// Cookies
if *cookies != "" {
args.Cookies, err = util.ParseCookies(*cookies)
if err != nil {
argErrs.flagError("-cookie", fmt.Errorf("failed to parse cookies: %s", err))
}
}
// Concurrency
if *args.Parallel < 1 {
argErrs.flagWarningf("-p", "Cannot be less than 1, value corrected to default value (%d)", defaultConcurrency)
*args.Parallel = defaultConcurrency
} else if *args.Parallel > maxConcurrency {
argErrs.flagWarningf("-p", "Value reduced to maximum allowed value (%d)", maxConcurrency)
*args.Parallel = maxConcurrency
}
// content-type auto-detection
if *args.POSTdata != "" && *args.ContentType == "" {
*args.ContentType = util.DetectContentType(*args.POSTdata)
argErrs.warningf("HTTP Content-Type detected automatically as %s", color.Yellow(*args.ContentType))
}
// decide on input source
switch flag.NArg() {
case 0:
// no input passed, STDIN will be used
case 1:
// input is passed
args.Input = &flag.Args()[0]
default:
// too many positional arguments
argErrs.flagErrorf("[INPUT]", "Specify exactly one input string, or pipe into STDIN")
}
return args, argErrs
}