/
main.go
150 lines (134 loc) · 2.54 KB
/
main.go
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package main
import (
"bufio"
"debug/elf"
"flag"
"fmt"
"math"
"os"
"runtime"
)
const (
TRACE1 = 0x1
TRACE2 = 0x2
)
var (
cmd = flag.Bool("cmd", false, "Command to execute")
diff = flag.Bool("diff", false, "Diff traces")
startAddr = uint64(math.MaxUint64)
endAddr = uint64(0)
)
func usage() {
fmt.Printf("usage: diff_tracer -cmd cmd args > traceX\n")
fmt.Printf(" diff_tracer -diff trace1 trace2 > diff.idc\n\n")
flag.PrintDefaults()
}
func main() {
var err error
runtime.LockOSThread()
flag.Usage = usage
flag.Parse()
switch {
case *cmd && flag.NArg() > 0:
err = cmdMode(flag.Arg(0), flag.Args()[1:])
case *diff && flag.NArg() == 2:
err = diffMode(flag.Arg(0), flag.Arg(1))
default:
usage()
os.Exit(1)
}
if err != nil {
panic(err)
}
}
func cmdMode(cmd string, args []string) error {
f, err := elf.Open(cmd)
if err != nil {
return err
}
defer f.Close()
// Set mem limits
for _, p := range f.Progs {
if p.Type != elf.PT_LOAD {
continue
}
if p.Vaddr < startAddr {
startAddr = p.Vaddr
}
if addr := p.Vaddr + p.Memsz; addr > endAddr {
endAddr = addr
}
}
pt, err := ForkExec(cmd, args)
if err != nil {
return err
}
if err := pt.Wait(printPC); err != nil {
return err
}
return nil
}
func diffMode(trace1, trace2 string) error {
t1, err := readTrace(trace1)
if err != nil {
return err
}
t2, err := readTrace(trace2)
if err != nil {
return err
}
diff := make(map[uint64]uint)
for _, addr := range t1 {
diff[addr] |= TRACE1
}
for _, addr := range t2 {
diff[addr] |= TRACE2
}
outputIDC(diff)
return nil
}
func printPC(pt *Ptrace) error {
regs, err := pt.Regs()
if err != nil {
return err
}
if pc := regs.PC(); pc >= startAddr && pc <= endAddr {
fmt.Printf("0x%08x\n", regs.PC())
}
return nil
}
func readTrace(trace string) ([]uint64, error) {
f, err := os.Open(trace)
if err != nil {
return nil, err
}
defer f.Close()
t := make([]uint64, 0, 1024)
s := bufio.NewScanner(f)
for s.Scan() {
n, err := ParseUint64(s.Text())
if err != nil {
return nil, err
}
t = append(t, n)
}
if err := s.Err(); err != nil {
return nil, err
}
return t, nil
}
func outputIDC(diff map[uint64]uint) {
fmt.Println("#include <idc.idc>")
fmt.Println("static main() {")
for k, v := range diff {
switch v {
case TRACE1:
fmt.Printf("SetColor(0x%08x, CIC_ITEM, 0x33CC33);\n", k)
case TRACE2:
fmt.Printf("SetColor(0x%08x, CIC_ITEM, 0x0000CC);\n", k)
case TRACE1 | TRACE2:
fmt.Printf("SetColor(0x%08x, CIC_ITEM, 0xCCCCCC);\n", k)
}
}
fmt.Println("}")
}