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ngrep 설치 및 사용하기

· 13년 전 · 1881
 # ngrep 설치
 
wget http://prdownloads.sf.net/ngrep/ngrep-1.43.tar.bz2
bunzip2 ngrep-1.43.tar.bz2
tar xvfp ngrep-1.43.tar
cd ngrep-1.43
* gcc 가 없다면 설치
yum -y install gcc
* pcap 
yum -y install libpcap-devel
./configure
make
 
 
# 사용방법
 
usage: ngrep <-hXViwqpevxlDtTRM> <-IO pcap_dump> <-n num> <-d dev> <-A num>
             <-s snaplen> <-S limitlen> <-W normal|byline|none> <-c cols>
             <-P char> <-F file> <match expression> <bpf filter>
   -h  is help/usage
   -V  is version information
   -q  is be quiet (don't print packet reception hash marks)
   -e  is show empty packets
   -i  is ignore case
   -v  is invert match
   -R  is don't do privilege revocation logic
   -x  is print in alternate hexdump format
   -X  is interpret match expression as hexadecimal
   -w  is word-regex (expression must match as a word)
   -p  is don't go into promiscuous mode
   -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
   -T  is print delta timestamp every time a packet is matched
   -M  is don't do multi-line match (do single-line match instead)
   -I  is read packet stream from pcap format file pcap_dump
   -O  is dump matched packets in pcap format to pcap_dump
   -n  is look at only num packets
   -A  is dump num packets after a match
   -s  is set the bpf caplen
   -S  is set the limitlen on matched packets
   -W  is set the dump format (normal, byline, none)
   -c  is force the column width to the specified size
   -P  is set the non-printable display char to what is specified
   -F  is read the bpf filter from the specified file
   -d  is use specified device instead of the pcap default
 
 
./ngrep -t port 80
 
 
[root@www ngrep-1.43]# ./ngrep -t port 80
interface: eth0 (211.x.x.x/255.255.255.128)
filter: ip and ( port 80 )
####
T 2011/09/16 10:57:18.288304 x.x.x.x:50815 -> x.x.x.x:80 [AP]
  GET / HTTP/1.1..Accept: */*..Accept-Language: ko-KR..User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB7.1; chromeframe/13.0.782.220; SLCC2; .NET
   CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)..Accept-Encoding: gzip, deflate..Host: x.x.x.x.Connection: Keep-Alive....     
##
...중략

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