reform.awk
上传用户:tany51
上传日期:2013-06-12
资源大小:1397k
文件大小:3k
- #!/usr/bin/awk -f
- # This file converts tcpdump output into a hexdump with
- # ASCII strings on the right. It replaces packet headers
- # with "*"s to reduce visual noise.
- #
- # Use it like:
- # tcpdump -s 2000 -x [<filter options>] | reform.awk
- # To save a dump:
- # tcpdump -s 2000 -w dumpfile
- # To replay it:
- # tcpdump -x -s 2000 -r dumpfile | reform.awk
- function hexvalue(nybble) {
- if (nybble=="0") { return 0; }
- if (nybble=="1") { return 1; }
- if (nybble=="2") { return 2; }
- if (nybble=="3") { return 3; }
- if (nybble=="4") { return 4; }
- if (nybble=="5") { return 5; }
- if (nybble=="6") { return 6; }
- if (nybble=="7") { return 7; }
- if (nybble=="8") { return 8; }
- if (nybble=="9") { return 9; }
- if (nybble=="a") { return 10; }
- if (nybble=="b") { return 11; }
- if (nybble=="c") { return 12; }
- if (nybble=="d") { return 13; }
- if (nybble=="e") { return 14; }
- if (nybble=="f") { return 15; }
- }
- # ab67 483d cac9 08ca 3efb 35f8 9406 36e8
- {
- if (substr($0,1,1)=="t") {
- printf(" ");
- str = "";
- for (i=1; i<=NF; i++) {
- nybble1 = substr($(i),1,1);
- nybble2 = substr($(i),2,1);
- byte1 = 16*hexvalue(nybble1)+hexvalue(nybble2);
- if (headerleft) {
- headerleft--;
- printf("** ");
- str = str " ";
- } else {
- printf("%02X ",byte1);
- if (byte1<32 || byte1>126) {
- str = str ".";
- } else {
- str = str sprintf("%c",0+byte1);
- }
- }
-
- nybble3 = substr($(i),3,1);
- nybble4 = substr($(i),4,1);
- if (nybble3=="" && nybble4=="") {
- printf(" ");
- } else {
- byte2 = 16*hexvalue(nybble3)+hexvalue(nybble4);
- if (headerleft) {
- headerleft--;
- printf("** ");
- str = str " ";
- } else {
- printf("%02X ",byte2);
- if (byte2<32 || byte2>126) {
- str = str ".";
- } else {
- str = str sprintf("%c",0+byte2);
- }
- }
- }
- if (i==4) {
- printf(" ");
- }
- }
- for (; i<=8; i++) {
- if (i==4) {
- printf(" ");
- }
- printf(" ");
- }
- printf(" %sn",str);
- } else {
- printf("%sn",$0);
- headerleft = 40;
- }
- }