ngrep 설치 및 사용하기
# ngrep 설치
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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