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Linux系统中字符串搜索命令ngrep的用法

作者:佚名 来源:网络整理 2016-1-7

   ngrep 是grep的网络版,他力求更多的grep特征,用于搜寻指定的数据包。由于安装ngrep需用到ibpcap库, 所以支持大量的操作系统和网络协议,能识别TCP、UDP和ICMP包。

  安装ngrep

  下载地址

  代码如下:

  git clone git://git.code.sf.net/p/ngrep/code ngrep-code

  进入目录

  代码如下:

  cd ngrep-code

  ./configure --with-pcap-includes=/usr/local/include/pcap

  make

  make install

  选项

  -h is help/usage

  -V is version information

  -q is be quiet (don't print packet reception hash marks)静默模式,如果没有此开关,未匹配的数据包都以“#”显示

  -e is show empty packets 显示空数据包

  -i is ignore case 忽略大小写

  -v is invert match 反转匹配

  -R is don't do privilege revocation logic

  -x is print in alternate hexdump format 以16进制格式显示

  -X is interpret match expression as hexadecimal 以16进制格式匹配

  -w is word-regex (expression must match as a word) 整字匹配

  -p is don't go into promiscuous mode 不使用混杂模式

  -l is make stdout line buffered

  -D is replay pcap_dumps with their recorded time intervals

  -t is print timestamp every time a packet is matched在每个匹配的包之前显示时间戳

  -T is print delta timestamp every time a packet is matched显示上一个匹配的数据包之间的时间间隔

  -M is don't do multi-line match (do single-line match instead)仅进行单行匹配

  -I is read packet stream from pcap format file pcap_dump 从文件中读取数据进行匹配

  -O is dump matched packets in pcap format to pcap_dump 将匹配的数据保存到文件

  -n is look at only num packets 仅捕获指定数目的数据包进行查看

  -A is dump num packets after a match匹配到数据包后Dump随后的指定数目的数据包

  -s is set the bpf caplen

  -S is set the limitlen on matched packets

  -W is set the dump format (normal, byline, single, none) 设置显示格式byline将解析包中的换行符

  -c is force the column width to the specified size 强制显示列的宽度

  -P is set the non-printable display char to what is specified

  -F is read the bpf filter from the specified file 使用文件中定义的bpf(Berkeley Packet Filter)

  -N is show sub protocol number 显示由IANA定义的子协议号

  -d is use specified device (index) instead of the pcap default

  应用举例:

  捕获所有post请求(加个-W byline 参数后,将解析包中的换行符):

  代码如下:

  ranger@ranger:~$ sudo ngrep -q -W byline "(POST).*"

  interface: eth0 (192.168.122.0/255.255.254.0)

  match: (POST).*

  T 192.168.122.74:46048 -> 140.207.228.58:80 [A]

  POST /Hotel/OTA_HotelSearch.asmx?wsdl HTTP/1.1.

  Content-Type: text/xml; charset=UTF-8.

  SOAPAction: http://ctrip.com/Request.

  Accept-Encoding: gzip, deflate.

  Content-Length: 1330.

  Accept: */*.

  Accept-Language: zh-cn.

  User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0).

  UA-CPU: x86.

  Accept-Encoding: gzip, deflate.

  Connection: close.

  Host: openapi.ctrip.com.

  .

   <Request>

  <Header AllianceID="***" SID="***" TimeStamp="1393554304685" RequestType="OTA_HotelSearch" Signature="B166CDF5422A6DA5BA81A08036E938E7"/>

  <HotelRequest>

  <RequestBody xmlns:ns="http://www.opentravel.org/OTA/2003/05" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <ns:OTA_HotelSearchRQ Version="1.0" PrimaryLangID="zh"

  xsi:schemaLocation="http://www.opentravel.org/OTA/2003/05 OTA_HotelSearchRQ.xsd"

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