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