awk script- delay 계산 및 IP 주소 C 상에서 얻어오기

awk script- delay 계산

참고 : http://www.winlab.rutgers.edu/~zhibinwu/html/ns_trace.html
작성 : 2006.12.17 by 임헌정
http://www.4ellene.net

CMU use a special fomat. Basically, you could 

$ns use-newtrace


to generate the new trace and the detailed explanation could be found

in Ns Manual.By default, old trace format is used. We need to analyze

the source code ./trace/cmu-trace.cc to understand it completely.

For instance, the function format_ip will explain the trace of IP part.




void

CMUTrace::format_ip(Packet *p, int offset)

{

        struct hdr_cmn *ch = HDR_CMN(p);

        struct hdr_ip *ih = HDR_IP(p);


        // hack the IP address to convert pkt format to hostid format

        // for now until port ids are removed from IP address. -Padma.

        int src = Address::instance().get_nodeaddr(ih->saddr());

        int dst = Address::instance().get_nodeaddr(ih->daddr());


    ............


}


void

CMUTrace::format_mac(Packet *p, int offset)

{


else {

                sprintf(pt_->buffer() + offset,

                        " [%x %x %x %x] ",

                        //*((u_int16_t*) &mh->dh_fc),

                        mh->dh_duration,


                        ETHER_ADDR(mh->dh_ra),

                        ETHER_ADDR(mh->dh_ta),




                        GET_ETHER_TYPE(mh->dh_body));

        }

......


}




A typical trace for a CBR traffic is:


s 20.000000000 _0_ AGT  --- 6 cbr 512 [0 0 0 0] ------- [0:0 1:0 32 0]

[0] 0 0

r 20.000000000 _0_ RTR  --- 6 cbr 512 [0 0 0 0] ------- [0:0 1:0 32 0]

[0] 0 0

s 20.000000000 _0_ RTR  --- 6 cbr 532 [0 0 0 0] ------- [0:0 1:0 32 1]

[0] 0 0

s 20.000275000 _0_ MAC  --- 6 cbr 584 [13a 1 0 800] ------- 

[0:0 1:0 32 1] [0] 0 0

r 20.004947063 _1_ MAC  --- 6 cbr 532 [13a 1 0 800] ------- 

[0:0 1:0 32 1] [0] 1 0

s 20.004957063 _1_ MAC  --- 0 ACK 38 [0 0 0 0]

r 20.004972063 _1_ AGT  --- 6 cbr 532 [13a 1 0 800] ------- 

[0:0 1:0 32 1] [0] 1 0

r 20.005261125 _0_ MAC  --- 0 ACK 38 [0 0 0 0]



A typical awk code for analyzing traces is:


For a topology involve 4 flows with distinguishing source and 

destination nodes,

this awkcode gets throughout data and put in wu.dat file


[예제] 


BEGIN {counter1 = 0;}

$1~/r/ && $2>50 && $2< 100  && /_2_/ && /AGT/  {   counter1 += 

($8- 20)

                       size = $8 - 20 }

END {

     print (size , counter1*8/(50) )  >> "wu.dat"}



로 delay_throughout.awk 파일 생성 


$ awk -f delay_though.awk aodv_3nodes_tcp.tr 실행 

# 50~100ms 사이에, 2노드로 수신한 패킷들




BEGIN {counter1 = 0; counter2 = 0; counter3 = 0; counter4 = 0;}

$1~/r/ && $2>50 && $2< 100  && /_12_/ && /AGT/  {   counter1 += ($8- 20)

                       size = $8 - 20 }

$1~/r/ && $2>50 && $2 <100 && /_13_/ && /AGT/  {   counter2 += ($8- 20)

                       size = $8 - 20 }

$1~/r/ && $2>50 && $2<100 && /_14_/ && /AGT/  {   counter3 += ($8- 20)

                       size = $8 - 20 }

$1~/r/ && $2>50 && $2<100 && /_15_/ && /AGT/  {   counter4 += ($8- 20)

                       size = $8 - 20 }


END {

     print (size , counter1*8/(50), counter2*8/50, counter3*8/(50), counter4*8/50,

                 (counter1+counter2+counter3+counter4)*8/50 )  >> "wu.dat"}



To analyze throughout or delay in a finite time duration,


we need extract send and receive time from the trace file


[예제] 
$ awk '$2>100 && $2 < 150 && (/_0_/ || /_2_/)  &&  /AGT/    {  print
 $1, $2, $6  > "dst2.tr" }' aodv_3nodes_tcp.tr



$2>100 && $2 < 150 && (/_6_/ || /_2_/)  &&  /AGT/    {  print $1, $2, $6  > "dst2.tr" }

$2>100 && $2 <150 && (/_0_/ || /_9_/)  &&  /AGT/    {   print $1, $2, $6  > "dst9.tr" }

$2>100 && $2 <150 && (/_12_/ || /_3_/)  &&  /AGT/    {   print $1, $2, $6  > "dst3.tr" }

$2>100 && $2 <150 && (/_10_/ || /_4_/)  &&  /AGT/    {   print $1, $2, $6  > "dst4.tr" }

$2>100 && $2 <150 && (/_11_/ || /_8_/)  &&  /AGT/    {   print $1, $2, $6  > "dst8.tr" }



The respective new trace files such as "dst2.tr" will keep time, "s'" 

or "r" and, "index", 

From that we could use a program to calculate the mean of delay.

The files is here: 

 


And to use this C code:

$ gcc delay.c -o delaycal

$ ./delaycal dst2.tr wu0.dat wu1.dat