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            Linux系统中字符串搜索命令ngrep的用法

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                ngrep 是grep的网络版 ,他力图更多的grep特征  ,用于征采指定的数据包 。由于安装ngrep需用到ibpcap库  , 以是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  ,若是没有此开关  ,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 忽略巨细写

                -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进制花样显示

                -X is interpret match expression as hexadecimal 以16进制花样匹配

                -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距离

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

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

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

                -n is look at only num packets 仅捕捉指定数目的数据包举行检察

                -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) 设置显示花样byline将剖析包中的换行符

                -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 使用文件中界说的bpf(Berkeley Packet Filter)

                -N is show sub protocol number 显示由IANA界说的子协议号

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

                应用举例:

                捕捉所有post请求(加个-W byline 参数后,将剖析包中的换行符):

                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.

                .

                

                

                

                

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

                

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