libbsm/main.go

// Copyright 2021, johan@nosd.in
// +build freebsd
//
// godit is a search tool for BSM audit trails used by FreeBSD auditd
//

package main

/*
#cgo CFLAGS: -I /usr/lib
#cgo LDFLAGS: -L. -lbsm -lc
#include <stdlib.h>
#include <bsm/libbsm.h>
*/
import "C"
import "unsafe"

import (
	"os"
	"fmt"
//	"encoding/hex"
	"github.com/spf13/pflag"
)

const (
	version = "0.001"
)

var (
	randFlag	bool
	showVersion	bool

	// Default delimiter
	delimiter	= ","
)


/*
// This function only work on full file for the moment
// It is essentially a rip of praudit:print_tokens function

 It is SLOW:

yo@martine:~/Dev/go/godit % time praudit -l /home/yo/Dev/go/godit/20211228134923.20211228151348 > praudit.log
102.428u 8.496s 1:50.98 99.9%   10+167k 0+191152io 0pf+0w

yo@martine:~/Dev/go/godit % time ./godit 20211228134923.20211228151348 > godit.log
232.573u 56.834s 5:12.00 92.7%  859+553k 0+381988io 0pf+0w

*/
func print_tokens(filename string) error {
	var buf			*C.u_char
	var recLen 		C.int
	var bytesRead	C.int
	var tok			C.tokenstr_t
	var del			*C.char
	var fp			*C.FILE
	var cFilename	*C.char
	var r			*C.char

	del = C.CString(delimiter)
	r = C.CString("r")

	cFilename = C.CString(filename)
	fp = C.fopen(cFilename, r)
	if fp == nil {
		return fmt.Errorf("Error opening file %s\n", filename)
	}

	for recLen != -1 {
		recLen = C.au_read_rec(fp, &buf)
		if recLen == -1 {
			break
		}
		bytesRead = 0
		for bytesRead < recLen {
			newstart := unsafe.Add(unsafe.Pointer(buf), bytesRead)
			if( -1 == C.au_fetch_tok(&tok, (*C.u_char)(newstart), recLen - bytesRead)) {
				break
			}
			C.au_print_flags_tok((*C.FILE)(C.stdout), &tok, del, C.AU_OFLAG_NONE)
		
			bytesRead += (C.int)(tok.len)
			// fmt.Printf is buffered, its use cause a time glitch on display
			C.putchar((C.int)(*del))
		}
		fmt.Printf("\n")
		C.fflush((*C.FILE)(C.stdout))
		
		// buf was allocated by au_read_rec(), we need to free it
		C.free(unsafe.Pointer(buf))

	}

	C.fclose(fp)

	C.free(unsafe.Pointer(cFilename))
	C.free(unsafe.Pointer(del))
	C.free(unsafe.Pointer(r))

	return nil
}


func main() {
	
	pflag.BoolVarP(&randFlag, "randFlag", "r", false, "A random flag, just to play you.")
	pflag.BoolVarP(&showVersion, "version", "V", false, "Show version then exit")

	pflag.Parse()

	if showVersion {
		fmt.Printf("Godit v%s\n", version)
		return
	}

	args := os.Args

	filename := args[len(args)-1]
	
/*	fmt.Printf("Args: %s\n", args)
	fmt.Printf("Filename: %s\n", filename)
*/
	
	if len(filename) > 0 {
/*		err := print_tokens(filename)
		if err != nil {
		:q
		fmt.Printf("Erreur dans print_tokens: %s\n", err.Error())
			return
		}
	}
*/
		f, err := os.Open(filename)
		if err != nil {
			fmt.Printf("Impossible d'ouvrir le fichier %s\n", filename)
			return
		}
		//for i := 0 ; i < 20 ; i++ {
		for {
			rec, err := readRecordToStruct(f)
			if err != nil { 
				fmt.Printf("Erreur : %v\n", err)
				return
			}
			rec.Print(os.Stdout, ",", 0)
		}
	}
}