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详解Linux系统中字符串搜索命令ngrep的用法(linux的sh)
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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/pcapmakemake 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..<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> <soap:Body> <Request xmlns="http://ctrip.com/"> <requestXML><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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