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sysadm |
1.1 |
#!/usr/bin/awk -f
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# This file converts tcpdump output into a hexdump with
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# ASCII strings on the right. It replaces packet headers
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# with "*"s to reduce visual noise.
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#
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# Use it like:
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# tcpdump -s 2000 -x [<filter options>] | reform.awk
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# To save a dump:
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# tcpdump -s 2000 -w dumpfile
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# To replay it:
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# tcpdump -x -s 2000 -r dumpfile | reform.awk
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function hexvalue(nybble) {
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if (nybble=="0") { return 0; }
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if (nybble=="1") { return 1; }
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if (nybble=="2") { return 2; }
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if (nybble=="3") { return 3; }
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if (nybble=="4") { return 4; }
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if (nybble=="5") { return 5; }
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if (nybble=="6") { return 6; }
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if (nybble=="7") { return 7; }
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if (nybble=="8") { return 8; }
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if (nybble=="9") { return 9; }
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if (nybble=="a") { return 10; }
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if (nybble=="b") { return 11; }
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if (nybble=="c") { return 12; }
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if (nybble=="d") { return 13; }
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if (nybble=="e") { return 14; }
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if (nybble=="f") { return 15; }
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}
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# ab67 483d cac9 08ca 3efb 35f8 9406 36e8
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{
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if (substr($0,1,1)=="\t") {
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printf(" ");
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str = "";
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for (i=1; i<=NF; i++) {
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nybble1 = substr($(i),1,1);
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nybble2 = substr($(i),2,1);
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byte1 = 16*hexvalue(nybble1)+hexvalue(nybble2);
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if (headerleft) {
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headerleft--;
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printf("** ");
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str = str " ";
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} else {
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printf("%02X ",byte1);
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if (byte1<32 || byte1>126) {
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str = str ".";
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} else {
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str = str sprintf("%c",0+byte1);
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}
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}
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nybble3 = substr($(i),3,1);
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nybble4 = substr($(i),4,1);
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if (nybble3=="" && nybble4=="") {
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printf(" ");
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} else {
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byte2 = 16*hexvalue(nybble3)+hexvalue(nybble4);
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if (headerleft) {
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headerleft--;
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printf("** ");
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str = str " ";
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} else {
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printf("%02X ",byte2);
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if (byte2<32 || byte2>126) {
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str = str ".";
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} else {
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str = str sprintf("%c",0+byte2);
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}
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}
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}
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if (i==4) {
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printf(" ");
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}
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}
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for (; i<=8; i++) {
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if (i==4) {
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printf(" ");
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}
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printf(" ");
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}
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printf(" %s\n",str);
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} else {
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printf("%s\n",$0);
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headerleft = 40;
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}
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}
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