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|
package main
import (
"flag"
"fmt"
"go/ast"
"go/parser"
"go/token"
"io/fs"
"log"
"os"
"path/filepath"
"strings"
"sync"
"golang.org/x/mod/modfile"
)
var (
dir = flag.String("d", ".", "directory with go.mod file")
recurse = flag.Bool("r", false, "recursively search for go.mod files")
cache = flag.String("modcache", getmodcache(), "location of go mod cache")
excheckm = flag.String("exempt", "golang.org", "domains exempt from the search, seperated by space")
checkInit = flag.Bool("ci", false, "check for implementations of init()")
checkUnsafe = flag.Bool("cu", false, "check for imports of unsafe")
checkCgo = flag.Bool("cc", false, "check for imports of cgo")
checkPprof = flag.Bool("cp", false, "check for imports of net/http/pprof")
exceptions []string
relcache string
)
func getmodcache() string {
if c := os.Getenv("GOMODCACHE"); c != "" {
return c
} else if c = os.Getenv("GOPATH"); c != "" {
return c + "/pkg/mod"
} else {
return os.Getenv("HOME") + "/pkg/mod"
}
}
func main() {
flag.Parse()
exceptions = strings.Fields(*excheckm)
relcache = strings.Replace(*cache, os.Getenv("HOME"), "~", 1)
if !(*checkInit || *checkUnsafe || *checkCgo || *checkPprof) {
fmt.Println("Nothing to check. Use -ci|-cu|-cc|-cp")
return
}
if !*recurse {
file := filepath.Join(*dir, "go.mod")
singleFile(file)
return
}
recursive(*dir)
}
func singleFile(file string) {
data, err := os.ReadFile(file)
if err != nil {
log.Fatal(err)
}
mf, err := modfile.Parse(file, data, nil)
if err != nil {
log.Fatal(err)
}
var wg sync.WaitGroup
wg.Add(len(mf.Require))
pathcache := map[string]bool{}
for _, r := range mf.Require {
path := strings.Join(r.Syntax.Token, "@")
if _, done := pathcache[path]; done {
continue
}
pathcache[path] = true
go func() {
defer wg.Done()
checkPath(*cache + "/" + path)
}()
}
wg.Wait()
}
func recursive(dir string) {
filepath.WalkDir(dir, func(p string, info fs.DirEntry, err error) error {
if err != nil {
return err
} else if info.IsDir() {
return nil
} else if "go.mod" == filepath.Base(p) {
fmt.Printf("analyzing %s\n", p)
singleFile(p)
}
return nil
})
}
func isExempt(path string) bool {
for _, pattern := range exceptions {
if strings.Contains(path, pattern) {
return true
}
}
return false
}
func modpath(filename string) string {
return filepath.Join(relcache, strings.TrimPrefix(filename, *cache+"/"))
}
func checkPath(path string) {
var fset = token.NewFileSet()
filter := func(inf fs.FileInfo) bool {
return !strings.HasSuffix(inf.Name(), "_test.go")
}
filepath.WalkDir(path, func(p string, info fs.DirEntry, err error) error {
if err != nil {
return err
} else if !info.IsDir() {
return nil
} else if isExempt(p) {
return nil
}
pkgs, err := parser.ParseDir(fset, p, filter, parser.Mode(0))
if err != nil {
return err
}
for _, pkg := range pkgs {
for filename, file := range pkg.Files {
if *checkUnsafe || *checkCgo || *checkPprof {
for _, imp := range file.Imports {
if *checkUnsafe && imp.Path.Value == `"unsafe"` {
fmt.Println("unsafe in", modpath(filename))
} else if *checkCgo && imp.Path.Value == `"C"` {
fmt.Println("cgo in", modpath(filename))
} else if *checkPprof && imp.Path.Value == `"net/http/pprof"` {
fmt.Println("pprof in", modpath(filename))
}
}
}
if !*checkInit {
break
}
INIT:
for _, decl := range file.Decls {
if f, ok := decl.(*ast.FuncDecl); ok {
if f.Name.Name == "init" {
fmt.Println("init in", modpath(filename))
break INIT
}
}
}
}
}
return nil
})
}
|
