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Copy pathprocess_utils_linux.go
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Copy pathprocess_utils_linux.go
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168 lines (138 loc) · 3.55 KB
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//go:build linux
package main
import (
"bufio"
"bytes"
"fmt"
"io"
"os"
"path/filepath"
"strconv"
"strings"
)
// ListProcesses implementation for Linux via /proc filesystem
func ListProcesses() []ProcessInformation {
var procs []ProcessInformation
// /proc should exist
d, err := os.Open("/proc")
if err != nil {
LogMessage(LOG_ERROR, "Cannot open /proc:", err)
return procs
}
defer d.Close()
files, err := d.Readdir(-1)
if err != nil {
LogMessage(LOG_ERROR, "Cannot read /proc:", err)
return procs
}
for _, file := range files {
if !file.IsDir() {
continue
}
// Check if filename is numeric (PID)
pid, err := strconv.ParseUint(file.Name(), 10, 32)
if err != nil {
continue
}
// Get Process Info
name, path, mem, err := GetProcessDataLinux(uint32(pid))
if err == nil && len(mem) > 0 {
if len(name) == 0 {
name = fmt.Sprintf("Unknown_%d", pid)
}
procs = append(procs, ProcessInformation{
PID: uint32(pid),
ProcessName: name,
ProcessPath: path,
MemoryDump: mem,
})
}
}
return procs
}
func GetProcessDataLinux(pid uint32) (name string, path string, memory []byte, err error) {
procDir := fmt.Sprintf("/proc/%d", pid)
// Get Path from /proc/[pid]/exe
exeLinks, err := os.Readlink(filepath.Join(procDir, "exe"))
if err == nil {
path = exeLinks
name = filepath.Base(path)
} else {
// Fallback to cmdline
cmdline, err := os.ReadFile(filepath.Join(procDir, "cmdline"))
if err == nil {
// cmdline arguments are null separated
parts := bytes.SplitN(cmdline, []byte{0}, 2)
if len(parts) > 0 && len(parts[0]) > 0 {
path = string(parts[0])
name = filepath.Base(path)
}
}
}
if len(name) == 0 {
return "", "", nil, fmt.Errorf("could not determine process name")
}
// Dump memory from mapped files (modules/libs/binary)
memory, err = dumpMappedMemory(pid)
return name, path, memory, err
}
func dumpMappedMemory(pid uint32) ([]byte, error) {
mapsPath := fmt.Sprintf("/proc/%d/maps", pid)
memPath := fmt.Sprintf("/proc/%d/mem", pid)
// Open maps file
mapsFile, err := os.Open(mapsPath)
if err != nil {
return nil, err
}
defer mapsFile.Close()
// Open mem file
memFile, err := os.Open(memPath)
if err != nil {
return nil, err
}
defer memFile.Close()
var fullMemory []byte
scanner := bufio.NewScanner(mapsFile)
// Parse maps
for scanner.Scan() {
line := scanner.Text()
fields := strings.Fields(line)
// Format: 00400000-00452000 r-xp 00000000 08:02 173521 /usr/bin/dbus-daemon
if len(fields) < 6 {
continue
}
perms := fields[1]
path := fields[5]
// Filter: Must be readable "r" and must be associated with a file (not [heap], [stack], or check if path is a file path)
// To match Windows behavior "EnumProcessModules", we prioritize mapped files.
// Note: we can interpret special paths like [heap] if we want dynamic memory too, but "Modules" usually implies libs.
if !strings.Contains(perms, "r") || strings.HasPrefix(path, "[") {
continue
}
// Parse range
rangeParts := strings.Split(fields[0], "-")
if len(rangeParts) != 2 {
continue
}
start, err1 := strconv.ParseInt(rangeParts[0], 16, 64)
end, err2 := strconv.ParseInt(rangeParts[1], 16, 64)
if err1 != nil || err2 != nil {
continue
}
size := end - start
if size <= 0 {
continue
}
// Read memory
buffer := make([]byte, size)
_, err = memFile.Seek(start, 0) // 0 = io.SeekStart
if err != nil {
continue
}
_, err = io.ReadFull(memFile, buffer)
if err == nil {
fullMemory = append(fullMemory, buffer...)
}
}
return fullMemory, nil
}