abs3nt/fbisender
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This commit is contained in:
abs3nt 2024-11-06 00:33:27 -08:00
parent 7818103d5d
commit 9203b99dcc
Signed by: abs3nt
GPG Key ID: A7BD96A8BAB04C09
7 changed files with 287 additions and 266 deletions
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13
go.mod
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@ -2,4 +2,15 @@ module git.asdf.cafe/abs3nt/fbisender
go 1.23.2
require gopkg.in/yaml.v2 v2.4.0
require (
git.asdf.cafe/abs3nt/gunner v0.0.1
gopkg.in/yaml.v2 v2.4.0
)
require (
github.com/cristalhq/aconfig v0.18.5 // indirect
github.com/cristalhq/aconfig/aconfigdotenv v0.17.1 // indirect
github.com/joho/godotenv v1.4.0 // indirect
github.com/urfave/cli/v3 v3.0.0-alpha9.2 // indirect
sigs.k8s.io/yaml v1.4.0 // indirect
)

15
go.sum
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@ -1,4 +1,19 @@
git.asdf.cafe/abs3nt/gunner v0.0.1 h1:N6kCe7fH83kzm1Sjp/5uZbl8FM5s7KoYCfmhO8qyQbA=
git.asdf.cafe/abs3nt/gunner v0.0.1/go.mod h1:Q4zhiPfmffCVAb5xIzZn6Momm91uf/deqRVd2/vdjd4=
github.com/cristalhq/aconfig v0.17.0/go.mod h1:NXaRp+1e6bkO4dJn+wZ71xyaihMDYPtCSvEhMTm/H3E=
github.com/cristalhq/aconfig v0.18.5 h1:QqXH/Gy2c4QUQJTV2BN8UAuL/rqZ3IwhvxeC8OgzquA=
github.com/cristalhq/aconfig v0.18.5/go.mod h1:NXaRp+1e6bkO4dJn+wZ71xyaihMDYPtCSvEhMTm/H3E=
github.com/cristalhq/aconfig/aconfigdotenv v0.17.1 h1:HG2ql5fGe4FLL2fUv6o+o0YRyF1mWEcYkNfWGWD82k4=
github.com/cristalhq/aconfig/aconfigdotenv v0.17.1/go.mod h1:gQIKkh+HkVcODvMNz/cLbH65Pk9b0r4tfolCOsI8G9I=
github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/joho/godotenv v1.4.0 h1:3l4+N6zfMWnkbPEXKng2o2/MR5mSwTrBih4ZEkkz1lg=
github.com/joho/godotenv v1.4.0/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
github.com/urfave/cli/v3 v3.0.0-alpha9.2 h1:CL8llQj3dGRLVQQzHxS+ZYRLanOuhyK1fXgLKD+qV+Y=
github.com/urfave/cli/v3 v3.0.0-alpha9.2/go.mod h1:FnIeEMYu+ko8zP1F9Ypr3xkZMIDqW3DR92yUtY39q1Y=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E=
sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY=

280
main.go
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@ -2,282 +2,30 @@ package main
import (
"context"
"encoding/binary"
"fmt"
"io"
"log"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
"time"
"gopkg.in/yaml.v2"
"git.asdf.cafe/abs3nt/fbisender/src/sender"
"github.com/urfave/cli/v3"
)
const (
defaultHostPort = 8080
defaultTargetPort = "5000"
)
var acceptedExtensions = []string{".cia", ".tik", ".cetk", ".3dsx"}
type Config struct {
TargetIP string `yaml:"target_ip"`
HostIP string `yaml:"host_ip"`
HostPort int `yaml:"host_port"`
}
func main() {
log.SetFlags(0)
config, err := loadConfig()
if err != nil {
log.Fatalf("Error loading configuration: %v", err)
app := &cli.Command{
Name: "fbisender",
Usage: "send files to FBI over network with an HTTP server",
UsageText: "fbisender [global options] <target file or directory>",
Action: func(ctx context.Context, c *cli.Command) error {
if !c.Args().Present() {
return fmt.Errorf("target file or directory is required as an argument")
}
return sender.SendFiles(ctx, c.Args().First())
},
}
targetPath, err := parseArguments()
if err != nil {
log.Fatalf("Error parsing arguments: %v", err)
}
fileListPayload, directory, err := prepareFileListPayload(config, targetPath)
if err != nil {
log.Fatalf("Error preparing file list payload: %v", err)
}
if err := changeDirectory(directory); err != nil {
log.Fatalf("Error changing directory: %v", err)
}
fmt.Println("\nURLs:")
fmt.Println(fileListPayload + "\n")
server := startHTTPServer(config.HostPort)
conn, err := sendPayload(config.TargetIP, fileListPayload)
if err != nil {
log.Fatalf("Error sending payload: %v", err)
}
defer conn.Close()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
if err := waitForInstallation(ctx, conn); err != nil {
log.Printf("Installation process error: %v", err)
}
cancel()
}()
select {
case <-ctx.Done():
case sig := <-sigChan:
fmt.Printf("\nReceived signal %v. Shutting down...\n", sig)
cancel()
}
shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 5*time.Second)
defer shutdownCancel()
if err := server.Shutdown(shutdownCtx); err != nil {
log.Printf("HTTP server shutdown error: %v", err)
}
wg.Wait()
fmt.Println("Server gracefully shut down.")
}
func loadConfig() (*Config, error) {
configDirectory, err := os.UserConfigDir()
if err != nil {
homeDir, err := os.UserHomeDir()
if err != nil {
return nil, fmt.Errorf("getting home directory: %w", err)
}
configDirectory = filepath.Join(homeDir, ".config")
}
data, err := os.ReadFile(filepath.Join(configDirectory, "fbisender", "config.yaml"))
if err != nil {
return nil, err
}
var config Config
if err := yaml.Unmarshal(data, &config); err != nil {
return nil, err
}
if config.TargetIP == "" {
return nil, err
}
if config.HostIP == "" {
log.Println("Detecting host IP...")
hostIP, err := detectHostIP()
if err != nil {
return nil, err
}
config.HostIP = hostIP
}
if config.HostPort == 0 {
config.HostPort = defaultHostPort
}
return &config, nil
}
func parseArguments() (string, error) {
if len(os.Args) < 2 {
return "", fmt.Errorf("usage: %s <file / directory>", os.Args[0])
}
targetPath := strings.TrimSpace(os.Args[1])
if _, err := os.Stat(targetPath); os.IsNotExist(err) {
return "", fmt.Errorf("%s: no such file or directory", targetPath)
}
return targetPath, nil
}
func prepareFileListPayload(config *Config, targetPath string) (string, string, error) {
fmt.Println("Preparing data...")
baseURL := config.HostIP + ":" + strconv.Itoa(config.HostPort) + "/"
var fileListPayload string
var directory string
fileInfo, err := os.Stat(targetPath)
if err != nil {
return "", "", err
}
if fileInfo.IsDir() {
directory = targetPath
files, err := os.ReadDir(directory)
if err != nil {
return "", "", fmt.Errorf("reading directory: %w", err)
}
for _, file := range files {
if !file.IsDir() && hasAcceptedExtension(file.Name()) {
encodedFileName := url.PathEscape(file.Name())
fileListPayload += baseURL + encodedFileName + "\n"
}
}
} else {
if hasAcceptedExtension(fileInfo.Name()) {
encodedFileName := url.PathEscape(fileInfo.Name())
fileListPayload = baseURL + encodedFileName
directory = filepath.Dir(targetPath)
} else {
return "", "", fmt.Errorf("unsupported file extension. Supported extensions are: %v", acceptedExtensions)
}
}
if fileListPayload == "" {
return "", "", fmt.Errorf("no files to serve")
}
return fileListPayload, directory, nil
}
func changeDirectory(directory string) error {
if directory != "" && directory != "." {
if err := os.Chdir(directory); err != nil {
return err
}
}
return nil
}
func startHTTPServer(port int) *http.Server {
fmt.Println("Starting HTTP server on port", port)
server := &http.Server{
Addr: ":" + strconv.Itoa(port),
Handler: http.FileServer(http.Dir(".")),
}
go func() {
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
log.Fatalf("Error starting HTTP server: %v", err)
}
}()
return server
}
func sendPayload(targetIP, fileListPayload string) (net.Conn, error) {
fmt.Printf("Sending URL(s) to %s on port %s...\n", targetIP, defaultTargetPort)
conn, err := net.Dial("tcp", net.JoinHostPort(targetIP, defaultTargetPort))
if err != nil {
return nil, fmt.Errorf("dialing target device: %w", err)
}
payloadBytes := []byte(fileListPayload)
length := uint32(len(payloadBytes))
lengthBytes := make([]byte, 4)
binary.BigEndian.PutUint32(lengthBytes, length)
if _, err := conn.Write(append(lengthBytes, payloadBytes...)); err != nil {
conn.Close()
return nil, fmt.Errorf("writing to connection: %w", err)
}
return conn, nil
}
func waitForInstallation(ctx context.Context, conn net.Conn) error {
fmt.Println("Waiting for the installation to complete...")
buf := make([]byte, 1024)
for {
select {
case <-ctx.Done():
return nil
default:
_, err := conn.Read(buf)
if err != nil {
if err == io.EOF || strings.Contains(err.Error(), "connection reset by peer") {
fmt.Println("Installation completed. Connection closed by target device.")
return nil
}
return fmt.Errorf("reading from connection: %w", err)
}
}
if err := app.Run(context.Background(), os.Args); err != nil {
log.Fatal(err)
}
}
func detectHostIP() (string, error) {
conn, err := net.Dial("udp", "8.8.8.8:53")
if err != nil {
return "", fmt.Errorf("detecting host IP: %w", err)
}
defer conn.Close()
localAddr := conn.LocalAddr().(*net.UDPAddr)
return localAddr.IP.String(), nil
}
func hasAcceptedExtension(fileName string) bool {
ext := strings.ToLower(filepath.Ext(fileName))
for _, acceptedExt := range acceptedExtensions {
if ext == acceptedExt {
return true
}
}
return false
}

16
src/config/config.go Normal file
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@ -0,0 +1,16 @@
package config
import "git.asdf.cafe/abs3nt/gunner"
type Config struct {
TargetIP string `yaml:"target_ip"`
TargetPort string `yaml:"target_port" default:"5000"`
HostIP string `yaml:"host_ip"`
HostPort int `yaml:"host_port" default:"8080"`
}
func NewConfig() *Config {
c := &Config{}
gunner.LoadApp(c, "fbisender")
return c
}

37
src/fileutils/fileutils.go Normal file
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@ -0,0 +1,37 @@
package fileutils
import (
"os"
"path/filepath"
"strings"
)
func ChangeDirectory(directory string) error {
if directory != "" && directory != "." {
if err := os.Chdir(directory); err != nil {
return err
}
}
return nil
}
var acceptedExtensions = map[string]struct{}{
".cia": {},
".tik": {},
".cetk": {},
".3dsx": {},
}
func HasAcceptedExtension(fileName string) bool {
ext := strings.ToLower(filepath.Ext(fileName))
_, ok := acceptedExtensions[ext]
return ok
}
func GetSupportedExtensions() []string {
var supportedExtensions []string
for ext := range acceptedExtensions {
supportedExtensions = append(supportedExtensions, ext)
}
return supportedExtensions
}

136
src/sender/sender.go Normal file
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@ -0,0 +1,136 @@
package sender
import (
"context"
"encoding/binary"
"fmt"
"log"
"net"
"net/url"
"os"
"os/signal"
"path/filepath"
"strings"
"sync"
"syscall"
"git.asdf.cafe/abs3nt/fbisender/src/config"
"git.asdf.cafe/abs3nt/fbisender/src/fileutils"
"git.asdf.cafe/abs3nt/fbisender/src/server"
)
func SendFiles(ctx context.Context, targetPath string) error {
config := config.NewConfig()
fileListPayload, directory, err := prepareFileListPayload(config, targetPath)
if err != nil {
return fmt.Errorf("preparing file list payload: %w", err)
}
if err := fileutils.ChangeDirectory(directory); err != nil {
return fmt.Errorf("changing directory: %w", err)
}
fmt.Println("\nURLs:")
fmt.Println(fileListPayload + "\n")
httpServer := server.StartHTTPServer(config.HostPort)
defer server.ShutdownHTTPServer(httpServer)
conn, err := sendPayload(config.TargetIP, config.TargetPort, fileListPayload)
if err != nil {
return fmt.Errorf("sending payload: %w", err)
}
defer conn.Close()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
if err := server.WaitForInstallation(ctx, conn); err != nil {
log.Printf("installation process error: %v", err)
}
cancel()
}()
select {
case <-ctx.Done():
case sig := <-sigChan:
fmt.Printf("\nReceived signal %v. Initiating shutdown...\n", sig)
cancel()
}
wg.Wait()
fmt.Println("Server shut down successfully.")
return nil
}
func prepareFileListPayload(config *config.Config, targetPath string) (string, string, error) {
fmt.Println("Preparing data...")
baseURL := fmt.Sprintf("%s:%d/", config.HostIP, config.HostPort)
fileInfo, err := os.Stat(targetPath)
if err != nil {
return "", "", fmt.Errorf("stat target path: %w", err)
}
if fileInfo.IsDir() {
return prepareDirectoryPayload(baseURL, targetPath)
} else if fileutils.HasAcceptedExtension(fileInfo.Name()) {
encodedPath := encodeFilePath(baseURL, fileInfo.Name())
return encodedPath, filepath.Dir(targetPath), nil
}
return "", "", fmt.Errorf("unsupported file extension. Supported extensions are: %v", fileutils.GetSupportedExtensions())
}
func prepareDirectoryPayload(baseURL, directory string) (string, string, error) {
files, err := os.ReadDir(directory)
if err != nil {
return "", "", fmt.Errorf("reading directory: %w", err)
}
var payloadBuilder strings.Builder
for _, file := range files {
if !file.IsDir() && fileutils.HasAcceptedExtension(file.Name()) {
payloadBuilder.WriteString(encodeFilePath(baseURL, file.Name()) + "\n")
}
}
if payloadBuilder.Len() == 0 {
return "", "", fmt.Errorf("no files with supported extensions to serve")
}
return payloadBuilder.String(), directory, nil
}
func encodeFilePath(baseURL, fileName string) string {
return baseURL + url.PathEscape(fileName)
}
func sendPayload(targetIP, targetPort, fileListPayload string) (net.Conn, error) {
fmt.Printf("Sending URL(s) to %s on port %s...\n", targetIP, targetPort)
conn, err := net.Dial("tcp", net.JoinHostPort(targetIP, targetPort))
if err != nil {
return nil, fmt.Errorf("dialing target device: %w", err)
}
payloadBytes := []byte(fileListPayload)
length := uint32(len(payloadBytes))
lengthBytes := make([]byte, 4)
binary.BigEndian.PutUint32(lengthBytes, length)
if _, err := conn.Write(append(lengthBytes, payloadBytes...)); err != nil {
conn.Close()
return nil, fmt.Errorf("writing to connection: %w", err)
}
return conn, nil
}

58
src/server/server.go Normal file
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@ -0,0 +1,58 @@
package server
import (
"context"
"fmt"
"io"
"log"
"net"
"net/http"
"strconv"
"strings"
"time"
)
func StartHTTPServer(port int) *http.Server {
fmt.Println("Starting HTTP server on port", port)
server := &http.Server{
Addr: ":" + strconv.Itoa(port),
Handler: http.FileServer(http.Dir(".")),
}
go func() {
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
log.Fatalf("Error starting HTTP server: %v", err)
}
}()
return server
}
func WaitForInstallation(ctx context.Context, conn net.Conn) error {
fmt.Println("Waiting for the installation to complete...")
buf := make([]byte, 1024)
for {
select {
case <-ctx.Done():
return nil
default:
_, err := conn.Read(buf)
if err != nil {
if err == io.EOF || strings.Contains(err.Error(), "connection reset by peer") {
fmt.Println("Installation completed. Connection closed by target device.")
return nil
}
return fmt.Errorf("reading from connection: %w", err)
}
}
}
}
func ShutdownHTTPServer(httpServer *http.Server) {
shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := httpServer.Shutdown(shutdownCtx); err != nil {
log.Printf("HTTP server shutdown error: %v", err)
}
}