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Imported Upstream version 4.8.0.309
Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850
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94b2861243
388
external/boringssl/util/make_errors.go
vendored
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388
external/boringssl/util/make_errors.go
vendored
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// Copyright (c) 2014, Google Inc.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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package main
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import (
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"bufio"
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"errors"
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"flag"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"sort"
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"strconv"
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"strings"
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)
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// ssl.h reserves values 1000 and above for error codes corresponding to
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// alerts. If automatically assigned reason codes exceed this value, this script
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// will error. This must be kept in sync with SSL_AD_REASON_OFFSET in ssl.h.
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const reservedReasonCode = 1000
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var resetFlag *bool = flag.Bool("reset", false, "If true, ignore current assignments and reassign from scratch")
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func makeErrors(reset bool) error {
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topLevelPath, err := findToplevel()
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if err != nil {
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return err
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}
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dirName, err := os.Getwd()
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if err != nil {
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return err
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}
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lib := filepath.Base(dirName)
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headerPath := filepath.Join(topLevelPath, "include", "openssl", lib+".h")
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errDir := filepath.Join(topLevelPath, "crypto", "err")
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dataPath := filepath.Join(errDir, lib+".errordata")
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headerFile, err := os.Open(headerPath)
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if err != nil {
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if os.IsNotExist(err) {
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return fmt.Errorf("No header %s. Run in the right directory or touch the file.", headerPath)
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}
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return err
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}
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prefix := strings.ToUpper(lib)
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reasons, err := parseHeader(prefix, headerFile)
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headerFile.Close()
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if reset {
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err = nil
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// Retain any reason codes above reservedReasonCode.
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newReasons := make(map[string]int)
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for key, value := range reasons {
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if value >= reservedReasonCode {
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newReasons[key] = value
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}
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}
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reasons = newReasons
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}
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if err != nil {
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return err
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}
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dir, err := os.Open(".")
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if err != nil {
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return err
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}
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defer dir.Close()
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filenames, err := dir.Readdirnames(-1)
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if err != nil {
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return err
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}
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for _, name := range filenames {
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if !strings.HasSuffix(name, ".c") {
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continue
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}
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if err := addReasons(reasons, name, prefix); err != nil {
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return err
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}
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}
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assignNewValues(reasons, reservedReasonCode)
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headerFile, err = os.Open(headerPath)
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if err != nil {
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return err
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}
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defer headerFile.Close()
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newHeaderFile, err := os.OpenFile(headerPath+".tmp", os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0666)
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if err != nil {
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return err
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}
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defer newHeaderFile.Close()
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if err := writeHeaderFile(newHeaderFile, headerFile, prefix, reasons); err != nil {
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return err
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}
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os.Rename(headerPath+".tmp", headerPath)
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dataFile, err := os.OpenFile(dataPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
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if err != nil {
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return err
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}
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outputStrings(dataFile, lib, reasons)
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dataFile.Close()
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return nil
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}
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func findToplevel() (path string, err error) {
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path = ".."
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buildingPath := filepath.Join(path, "BUILDING.md")
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_, err = os.Stat(buildingPath)
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if err != nil && os.IsNotExist(err) {
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path = filepath.Join("..", path)
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buildingPath = filepath.Join(path, "BUILDING.md")
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_, err = os.Stat(buildingPath)
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}
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if err != nil {
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return "", errors.New("Cannot find BUILDING.md file at the top-level")
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}
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return path, nil
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}
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type assignment struct {
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key string
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value int
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}
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type assignmentsSlice []assignment
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func (a assignmentsSlice) Len() int {
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return len(a)
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}
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func (a assignmentsSlice) Less(i, j int) bool {
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return a[i].value < a[j].value
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}
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func (a assignmentsSlice) Swap(i, j int) {
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a[i], a[j] = a[j], a[i]
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}
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func outputAssignments(w io.Writer, assignments map[string]int) {
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var sorted assignmentsSlice
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for key, value := range assignments {
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sorted = append(sorted, assignment{key, value})
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}
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sort.Sort(sorted)
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for _, assignment := range sorted {
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fmt.Fprintf(w, "#define %s %d\n", assignment.key, assignment.value)
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}
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}
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func parseDefineLine(line, lib string) (key string, value int, ok bool) {
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if !strings.HasPrefix(line, "#define ") {
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return
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}
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fields := strings.Fields(line)
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if len(fields) != 3 {
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return
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}
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key = fields[1]
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if !strings.HasPrefix(key, lib+"_R_") {
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return
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}
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var err error
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if value, err = strconv.Atoi(fields[2]); err != nil {
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return
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}
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ok = true
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return
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}
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func writeHeaderFile(w io.Writer, headerFile io.Reader, lib string, reasons map[string]int) error {
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var last []byte
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var haveLast, sawDefine bool
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newLine := []byte("\n")
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scanner := bufio.NewScanner(headerFile)
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for scanner.Scan() {
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line := scanner.Text()
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_, _, ok := parseDefineLine(line, lib)
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if ok {
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sawDefine = true
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continue
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}
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if haveLast {
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w.Write(last)
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w.Write(newLine)
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}
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if len(line) > 0 || !sawDefine {
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last = []byte(line)
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haveLast = true
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} else {
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haveLast = false
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}
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sawDefine = false
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}
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if err := scanner.Err(); err != nil {
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return err
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}
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outputAssignments(w, reasons)
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w.Write(newLine)
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if haveLast {
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w.Write(last)
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w.Write(newLine)
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}
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return nil
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}
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func outputStrings(w io.Writer, lib string, assignments map[string]int) {
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lib = strings.ToUpper(lib)
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prefixLen := len(lib + "_R_")
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keys := make([]string, 0, len(assignments))
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for key := range assignments {
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keys = append(keys, key)
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}
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sort.Strings(keys)
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for _, key := range keys {
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fmt.Fprintf(w, "%s,%d,%s\n", lib, assignments[key], key[prefixLen:])
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}
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}
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func assignNewValues(assignments map[string]int, reserved int) {
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// Needs to be in sync with the reason limit in
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// |ERR_reason_error_string|.
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max := 99
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for _, value := range assignments {
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if reserved >= 0 && value >= reserved {
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continue
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}
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if value > max {
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max = value
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}
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}
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max++
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// Sort the keys, so this script is reproducible.
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keys := make([]string, 0, len(assignments))
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for key, value := range assignments {
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if value == -1 {
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keys = append(keys, key)
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}
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}
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sort.Strings(keys)
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for _, key := range keys {
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if reserved >= 0 && max >= reserved {
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// If this happens, try passing -reset. Otherwise bump
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// up reservedReasonCode.
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panic("Automatically-assigned values exceeded limit!")
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}
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assignments[key] = max
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max++
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}
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}
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func handleDeclareMacro(line, join, macroName string, m map[string]int) {
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if i := strings.Index(line, macroName); i >= 0 {
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contents := line[i+len(macroName):]
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if i := strings.Index(contents, ")"); i >= 0 {
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contents = contents[:i]
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args := strings.Split(contents, ",")
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for i := range args {
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args[i] = strings.TrimSpace(args[i])
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}
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if len(args) != 2 {
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panic("Bad macro line: " + line)
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}
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token := args[0] + join + args[1]
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if _, ok := m[token]; !ok {
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m[token] = -1
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}
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}
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}
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}
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func addReasons(reasons map[string]int, filename, prefix string) error {
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file, err := os.Open(filename)
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if err != nil {
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return err
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}
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defer file.Close()
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reasonPrefix := prefix + "_R_"
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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line := scanner.Text()
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handleDeclareMacro(line, "_R_", "OPENSSL_DECLARE_ERROR_REASON(", reasons)
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for len(line) > 0 {
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i := strings.Index(line, prefix+"_")
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if i == -1 {
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break
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}
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line = line[i:]
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end := strings.IndexFunc(line, func(r rune) bool {
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return !(r == '_' || (r >= 'A' && r <= 'Z') || (r >= '0' && r <= '9'))
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})
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if end == -1 {
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end = len(line)
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}
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var token string
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token, line = line[:end], line[end:]
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switch {
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case strings.HasPrefix(token, reasonPrefix):
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if _, ok := reasons[token]; !ok {
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reasons[token] = -1
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}
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}
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}
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}
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return scanner.Err()
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}
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func parseHeader(lib string, file io.Reader) (reasons map[string]int, err error) {
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reasons = make(map[string]int)
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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key, value, ok := parseDefineLine(scanner.Text(), lib)
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if !ok {
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continue
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}
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reasons[key] = value
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}
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err = scanner.Err()
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return
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}
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func main() {
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flag.Parse()
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if err := makeErrors(*resetFlag); err != nil {
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fmt.Fprintf(os.Stderr, "%s\n", err)
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os.Exit(1)
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}
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}
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