iptables 最近的 proc 文件的时间戳格式是什么?

iptables 最近的 proc 文件的时间戳格式是什么?

我想了解文件中记录的含义(由扩展/proc/net/xt_recent/ip_list创建),例如:recentiptables

src=127.0.0.1 ttl: 128 last_seen: 4298627364 oldest_pkt: 3 4298623492, 4298625777, 4298627364

所有字段看起来都很明显,last_look看起来像时间戳。但它不是 UNIX 时间格式的时间戳。转换为 UNIX 时间等于 03/21/2106 18:19:24。显然它不是“上次看到”的时间。

我怎样才能从last_seen时间中提取正确的值?

谢谢。

更新

为了避免误解:

$ date 
Mon Jun 15 14:14:00 MSK 2015

答案1

这应该有效:

FILE=iplist #This is file name of recent module output. It may vary on your system (like iplist)
TICKS=$(grep CONFIG_HZ= /boot/config-$(uname -r)|awk -F= '{print $2}') # Get current ticks per sec

printit()
{
    Len=`echo $1|wc -c`
    Date=$DATE
    Dot="."
    Loop=`echo 50-$Len|bc`
    loop=0
    while [ $loop -le $Loop ]
    do
        loop=`echo $loop+1|bc`
        Dot=`echo $Dot.`
    done
    echo "$1$Dot$DATE"
}
cat $FILE|while read LINE
do
    IP=`echo $LINE|awk '{print $1}'|awk -F= {'print $2'}`
    DATE=$(date -d@$(date +'%s'-$(echo \($(cat /proc/timer_list|grep -m1 -E '^jiffies'|cut -d" " -f2)-$(awk '{print $5}' $FILE)\)/$TICKS|bc)|bc))
    printit $IP $DATE
done

这是您的示例的输出:

127.0.0.1..........................................Пн. мая 18 14:24:40 OMST 2015

时区可能与您的区域设置不同

您还可以检查https://stackoverflow.com/questions/2731463/converting-jiffies-to-milli-seconds

答案2

我写了这个:

https://github.com/peppelinux/xt_recent_parser

输出如下:

python3 xt_recent_parser.py 
XT_RECENT python parser
<[email protected]>


114.241.108.160, last seen: 2017-03-25 18:21:42 after 13 Connections 
46.165.210.17, last seen: 2017-03-25 13:07:54 after 10 Connections 
61.53.219.162, last seen: 2017-03-25 17:39:17 after 20 Connections 
179.37.141.232, last seen: 2017-03-25 18:08:23 after 2 Connections 
114.42.117.39, last seen: 2017-03-25 13:22:14 after 18 Connections 
177.12.84.234, last seen: 2017-03-25 16:22:14 after 17 Connections 

答案3

这是吉菲斯,这是一个内部内核变量,每 1/HZ 秒递增一次。如 Maxiko 所示,您可以从中获取当前jiffies/proc/timer_list。您通常可以HZ从中获取/boot/config.<kernel-version>,因此您应该能够使用类似以下方法对该数据进行后处理:

#! /usr/bin/perl
use Time::HiRes qw(gettimeofday);
use POSIX;

my $kernel = (uname())[2];

open CONFIG, "<", "/boot/config-$kernel" or
  die "Can't find kernel config file: $!";

my $hz;
while (<CONFIG>) {
  if (/^CONFIG_HZ=(\d+)/) {
    $hz = $1;
    last;
  }
}
close CONFIG;

die "Can't determine HZ" unless $hz;

open TIMERS, "<", "/proc/timer_list" or
  die "Can't open /proc/timer_list: $!";

my $jiffies;
while (<TIMERS>) {
  if (/^jiffies: (\d+)/) {
    $jiffies = $1;
    last;
  }
}
close TIMERS;

die "Can't determine jiffies" unless $jiffies;

my ($seconds, $microseconds) = gettimeofday;
$seconds += $microseconds / 1e6;

while (<>) {
  s{(?<=last_seen: )\d+|\d+(?=,|$)}{
    my $t = $seconds + ($& - $jiffies) / $hz;
    $& . strftime(" [%F %T", localtime($t)) .
      sprintf(".%03d]", ($t * 1000 + 0.5) % 1000);
  }ge;
  print;
}

在您的示例和我的系统上(因此与您的系统上的 jiffies 不同)得到的结果如下:

src=127.0.0.1 ttl: 128 last_seen: 4298627364 [2016-08-16 17:21:00.882] oldest_pkt: 3 4298623492 [2016-08-16 17:20:45.394], 4298625777 [2016-08-16 17:20:54.534], 4298627364 [2016-08-16 17:21:00.882]

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