X-Git-Url: https://git.teslayout.com/public/public/public/?a=blobdiff_plain;f=example%2Fdiameter%2FpcapDecoder%2FtsharkDecoder.sh;h=35a9815594f122dda962c13ff888a7f0452c320e;hb=f844fa068cf757c0b517318dc1437bd29f319d94;hp=64ff2af6d19310af4f411a769edad198cc1c9219;hpb=c60abc0742150b5709fcf21ece212d09bc1da268;p=anna.git

diff --git a/example/diameter/pcapDecoder/tsharkDecoder.sh b/example/diameter/pcapDecoder/tsharkDecoder.sh
index 64ff2af..35a9815 100755
--- a/example/diameter/pcapDecoder/tsharkDecoder.sh
+++ b/example/diameter/pcapDecoder/tsharkDecoder.sh
@@ -38,7 +38,8 @@
 
 # Decoder version using tshark tool
 #
-# RESTRICTIONS: only TCP datagrams. Allow split diameter messages between frames, but not, several messages into single datagram.
+# RESTRICTIONS: TCP & SCTP datagrams. Allow split diameter messages between frames, but not, several messages into single datagram.
+#               If sniffing fails, try to create the <frame>.hex and <frame>.metadata files manually (try 'tshark -nr input.pcap -Vx' and so on ...)
 
 #############
 # VARIABLES #
@@ -157,8 +158,7 @@ which $TSHARK >/dev/null 2>/dev/null
 
 # Get the frames with diameter content (take care about '-2' two-pass option and don't add it, because we need to get reassembled parts in their corresponding frames):
 # Fields needed (we won't need diameter.hopbyhopid & diameter.endtoendid to verify diameter message as hint patterns; length management will be enough): see https://www.wireshark.org/docs/dfref/d/diameter.html
-FIELDS_DIAMETER="-e diameter.cmd.code -e diameter.flags.request -e diameter.applicationId -e diameter.hopbyhopid -e diameter.endtoendid -e diameter.Session-Id -e diameter.Origin-Host -e diameter.Subscription-Id-Data -e diameter.Subscription-Id-Type -e diameter.length"
-FIELDS="-e frame.number -e frame.time_epoch -e ip.src_host -e ip.dst_host $FIELDS_DIAMETER -e tcp.len -e frame.protocols -e tcp.segment"
+FIELDS="-e frame.number -e frame.time_epoch -e ip.src_host -e ip.dst_host -e diameter.cmd.code -e diameter.flags.request -e diameter.applicationId -e diameter.hopbyhopid -e diameter.endtoendid -e diameter.Session-Id -e diameter.Origin-Host -e diameter.Subscription-Id-Data -e diameter.Subscription-Id-Type -e frame.len -e tcp.len -e diameter.length -e frame.protocols -e tcp.segment -e sctp.chunk_length"
 # Disect selectors for non-standard diameter ports:
 for port in $OTHER_PORTS
 do
@@ -166,19 +166,38 @@ do
   DISECT_SELECTORS="$DISECT_SELECTORS -d tcp.port=$port,diameter"
 done
 
-$TSHARK -E separator="|" -r $PCAP_FILE -N mntC -Tfields $FIELDS $DISECT_SELECTORS 2>/dev/null | grep -i diameter > $tmpdir/diameter_frames
+$TSHARK -E separator="|" -r $PCAP_FILE -N mntC -Tfields $FIELDS $DISECT_SELECTORS 2>/dev/null > $tmpdir/all_frames
+grep -i diameter $tmpdir/all_frames > $tmpdir/diameter_frames
+#cat $tmpdir/all_frames
+
 # Example output:
-#                                                                                                                            /length\
-# frame     timestamp        src     dst   code R  App-ID   HopByHop   EndToEnd Session-Id Origin-Host Subs-Data  Subs-Type  DIAM TCP          protocol                    segments 
-#   1           2             3       4     5   6    7         8           9       10          11          12         13      14   15             16                          17
-#   1|1427215933.697904000|gt_traf|vcbavipt|272|1|16777238|0x0004e6e6|0x000bd986|xxxxxxx|xxxxxxxxxxxxx|xxxxxxxxxx|xxxxxxxxxxx|432|432|eth:ip:tcp:diameter:diameter:diameter3gpp|
-#   3|1427215934.449523000|vcbavipt|gt_traf|272|0|16777238|0x0004e6e6|0x000bd986|xxxxxxx|xxxxxxxxxxxxx|xxxxxxxxxx|xxxxxxxxxxx|292|292|eth:ip:tcp:diameter:diameter:diameter3gpp|
-#   5|1427215934.456160000|gt_traf|vcbavipt||||||||1400|eth:ip:tcp:diameter|
-#   6|1427215934.456204000|gt_traf|vcbavipt|265|1|16777236|0x000c73c3|0x0004cee4|xxxxxxx|xxxxxxxxxxxxx|xxxxxxxxxx|xxxxxxxxxxx|1972|572|eth:ip:tcp:diameter:diameter:diameter3gpp|5,6
-#   8|1427215935.123559000|vcbavipt|gt_traf|265|0|16777236|0x000c73c3|0x0004cee4|xxxxxxx|xxxxxxxxxxxxx|xxxxxxxxxx|xxxxxxxxxxx|248|248|eth:ip:tcp:diameter:diameter:diameter3gpp|
-all_frames=( $(cat $tmpdir/diameter_frames | cut -d\| -f1) )
-needs_join=( $(cat $tmpdir/diameter_frames | cut -d\| -f17) )
-main_frames=( $(cat $tmpdir/diameter_frames | awk -F\| '{ if ($15 != "") print $1 }') )
+#                                                                                         / lengths \
+# frm timestamp src   dst   code R  App-ID   HopByHop   EndToEnd  Sid OHost Subs SubsType FRM TCP DIA   protocol                              segments    sctp chunk length
+#   1   2      3       4      5  6    7          8          9     10   11    12     13    14   15  16      17                                    18             19
+#   1|tt.tt|gt_traf|vcbavipt|272|1|16777238|0x0004e6e6|0x000bd986|xxx|xxxxx|xxxxx|xxxxxxx|fff|432|432|eth:ip:tcp:diameter:diameter:diameter3gpp|
+#   3|tt.tt|vcbavipt|gt_traf|272|0|16777238|0x0004e6e6|0x000bd986|xxx|xxxxx|xxxxx|xxxxxxx|fff|292|292|eth:ip:tcp:diameter:diameter:diameter3gpp|
+#   5|tt.tt|gt_traf|vcbavipt||||||ffff|1400||eth:ip:tcp:diameter|
+#   6|tt.tt|gt_traf|vcbavipt|265|1|16777236|0x000c73c3|0x0004cee4|xxx|xxxxx|xxxxx|xxxxxxx|fff|572|1972|eth:ip:tcp:diameter:diameter:diameter3gpp|5,6
+#   8|tt.tt|vcbavipt|gt_traf|265|0|16777236|0x000c73c3|0x0004cee4|xxx|xxxxx|xxxxx|xxxxxxx|fff|248|248|eth:ip:tcp:diameter:diameter:diameter3gpp|
+cat $tmpdir/diameter_frames | cut -d\| -f1 > $tmpdir/frames_num
+all_frames=( $(cat $tmpdir/frames_num) )
+
+# Segments groups (TCP or SCTP):
+segmentsGroups=
+
+# The case of SCTP is precalculated:
+tshark -nr $PCAP_FILE $DISECT_SELECTORS -Tfields -e frame.number -e sctp.chunk_flags 2>/dev/null | awk '{ if ( $2 !~ "0x03" && $2 != "" ) print $1 }' > $tmpdir/extra_frames_num
+if [ -s $tmpdir/extra_frames_num ]
+then
+  # Take into account these frames in all_frames array:
+
+  cat $tmpdir/extra_frames_num >> $tmpdir/frames_num
+  all_frames=( $(cat $tmpdir/frames_num | sort -un) )
+
+  # Prepare as groups (1,2 7,8 ...)
+  segmentsGroups=$(tshark -nr $PCAP_FILE $DISECT_SELECTORS -Tfields -e frame.number -e sctp.chunk_flags 2>/dev/null | awk '{ if ( $2 !~ "0x03" && $2 != "" ) print $1; else print "\n" }' | uniq | tr '\n' ',' | sed 's/,,/ /g')
+fi
+
 
 # Reassemble procedure (using frame 1 as example):
 # (for non segmented frames, it is enough with tcp or diameter length within the frame content itself)
@@ -192,11 +211,53 @@ for frame in ${all_frames[@]}; do
   grep "^$frame " $tmpdir/all_hex_data | cut -d\" -f2 | sed 's/://g' > $tmpdir/block.$frame
   frame_info=$(grep "^${frame}|" $tmpdir/diameter_frames)
 
+  ##########################################################################################
   # Get the diameter part:
+  frm_len=$(echo $frame_info | cut -d\| -f14)
   tcp_len=$(echo $frame_info | cut -d\| -f15)
-  frm_len=$(wc -c $tmpdir/block.$frame | awk '{ print $1 }')
-  cut_len=$((frm_len-2*tcp_len))
-  cat $tmpdir/block.$frame | cut -c${cut_len}- > $RESULTS_DIR/$frame.hex
+  dia_len=$(echo $frame_info | cut -d\| -f16)
+  protocol=$(echo $frame_info | cut -d\| -f17)
+
+  # TCP and SCTP supported:
+  transport=$(echo $protocol | grep -ow tcp)
+  [ -z "$transport" ] && transport=$(echo $protocol | grep -ow sctp)
+  # in case of segmented SCTP frames, protocol won't be sctp ...:
+  if [ -s "$tmpdir/extra_frames_num" -a -z "$transport" ]
+  then
+    grep -qw ^${frame} $tmpdir/extra_frames_num
+    if [ $? -eq 0 ]
+    then
+      transport=sctp
+      frame_info=$(grep "^${frame}|" $tmpdir/all_frames)
+    fi
+  fi
+
+  case $transport in
+    sctp)
+      chunk_length=$(echo $frame_info | cut -d\| -f19)
+      dia_partial_len=$((chunk_length-16))
+      if [ "$dia_len" != "$dia_partial_len" ]
+      then
+        #echo "Segmented SCTP frame $frame; taking partial diameter length = $dia_partial_len"
+        dia_len=$dia_partial_len
+      fi 
+      cut_len=$((2*dia_len))
+      cat $tmpdir/block.$frame | rev | cut -c-${cut_len} | rev > $RESULTS_DIR/$frame.hex
+      ;;
+
+    tcp)
+      cut_len=$((2*(frm_len-tcp_len) + 1))
+      cat $tmpdir/block.$frame | cut -c${cut_len}- > $RESULTS_DIR/$frame.hex
+      cp $tmpdir/block.$frame /tmp/block
+      segments=$(echo $frame_info | cut -d\| -f18)
+      segmentsGroups="$segmentsGroups $segments"
+      ;;
+
+    *) _exit "Only TCP and SCTP transports supported !!"
+      ;;
+  esac
+  ##########################################################################################
+
   echo -n "Created $RESULTS_DIR/$frame.hex"
 
   # Metadata:
@@ -214,6 +275,7 @@ for frame in ${all_frames[@]}; do
   [ "$subscribertype" = "0" ] && subscribertype=msisdn
   [ "$subscribertype" = "1" ] && subscribertype=imsi
 
+
   #hbh=$(echo $frame_info | cut -d\| -f8)
   #e2e=$(echo $frame_info | cut -d\| -f9)
   # HBH and ETE To decimal:
@@ -240,19 +302,24 @@ for frame in ${all_frames[@]}; do
 done
 
 # Join frames which need to be reassembled:
-for group in ${needs_join[@]}; do
-  echo "Grouping frames $group ..."
+to_delete=
+for group in $segmentsGroups
+do
   group_array=( $(echo $group | sed 's/,/ /g') )
+  echo "Grouping frames ${group_array[*]} ..."
   for frame in ${group_array[@]}; do
     cat $RESULTS_DIR/$frame.hex >> $tmpdir/diam.$group
   done
   cat $tmpdir/diam.$group | tr -d '\n' > $RESULTS_DIR/$frame.hex
+  # Delete all frames except last one in the group:
+  to_delete="$to_delete  $(echo ${group_array[*]} | awk '{$NF=""; print $0}')"
 done
 
 # Delete superfluous metadata:
-echo "Deleting superfluous buffers & metadata ..."
-segments=( $(cat $tmpdir/diameter_frames | awk -F\| '{ if ($14 == "") print $1 }') )
-for s in ${segments[@]}; do rm $RESULTS_DIR/$s.*; done
+#segments=( $(cat $tmpdir/diameter_frames | awk -F\| '{ if ($16 == "") print $1 }') )
+segments=( $(echo $to_delete) )
+echo "Deleting superfluous buffers & metadata (${segments[*]}) ..."
+for s in ${segments[@]}; do rm $RESULTS_DIR/${s}.* ; done
 
 # Detecting Session-Id values:
 grep ^sessionid= $RESULTS_DIR/*.metadata 2>/dev/null | cut -d= -f2- | sort -u > $RESULTS_DIR/session-ids