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remove dependency to objcopy/otool for extraction

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This commit is contained in:
Loic Gelle 2017-06-28 10:52:03 -07:00
parent 5f00dcaf2f
commit 071418d0b5
1 changed files with 17 additions and 26 deletions
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43
extractor.go
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@ -8,11 +8,10 @@ import (
"path"
"path/filepath"
"strings"
"regexp"
"encoding/hex"
"io/ioutil"
"fmt"
"reflect"
"debug/macho"
"debug/elf"
)
type ExtractingArgs struct {
@ -253,38 +252,30 @@ func extractTimeLinkFiles(ea ExtractingArgs, filesToLink []string) {
}
func extractSectionDarwin(inputFile string) (contents []string) {
cmd := exec.Command("otool", "-X", "-s", DARWIN_SEGMENT_NAME, DARWIN_SECTION_NAME, inputFile)
out, err := cmd.Output()
machoFile, err := macho.Open(inputFile)
if err != nil {
log.Fatal("There was an error extracting the gllvm section from ", inputFile, ". Make sure that the 'otool' command is installed.")
log.Fatal("Mach-O file ", inputFile, " could not be read.")
}
//FIXME: ok this looks all wrong. need to deal with out properly and the go way, whatever that may be.
logDebug("extractSectionDarwin: T(out) = %v \n", reflect.TypeOf(out))
logDebug("extractSectionDarwin: out = %v \n", out)
sectionLines := strings.Split(string(out), "\n")
logDebug("extractSectionDarwin: sectionLines = %v\n", out)
regExp := regexp.MustCompile(`^(?:[0-9a-f]{8,16}\t)?([0-9a-f\s]+)$`)
var octets []byte
for _, line := range sectionLines {
if matches := regExp.FindStringSubmatch(line); matches != nil {
hexline := []byte(strings.Join(strings.Split(matches[1], " "), ""))
dst := make([]byte, hex.DecodedLen(len(hexline)))
hex.Decode(dst, hexline)
octets = append(octets, dst...)
}
section := machoFile.Section(DARWIN_SECTION_NAME)
sectionContents, errContents := section.Data()
if errContents != nil {
log.Fatal("Error reading the ", DARWIN_SECTION_NAME, " section of Mach-O file ", inputFile, ".")
}
contents = strings.Split(strings.TrimSuffix(string(octets), "\n"), "\n")
contents = strings.Split(strings.TrimSuffix(string(sectionContents), "\n"), "\n")
return
}
func extractSectionUnix(inputFile string) (contents []string) {
cmd := exec.Command("objcopy", "--dump-section", ELF_SECTION_NAME + "=/dev/stdout", inputFile)
out, err := cmd.Output()
elfFile, err := elf.Open(inputFile)
if err != nil {
log.Fatal("There was an error reading the contents of ", inputFile, ". Make sure that the 'objcopy' command is installed.")
log.Fatal("ELF file ", inputFile, " could not be read.")
}
contents = strings.Split(strings.TrimSuffix(string(out), "\n"), "\n")
section := elfFile.Section(ELF_SECTION_NAME)
sectionContents, errContents := section.Data()
if errContents != nil {
log.Fatal("Error reading the ", ELF_SECTION_NAME, " section of ELF file ", inputFile, ".")
}
contents = strings.Split(strings.TrimSuffix(string(sectionContents), "\n"), "\n")
return
}