Ethereal-users: Re: [Ethereal-users] Why Tethereal can not print protocol tree ofH245/RTP/RTCP

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From: "Martin Regner" <martin.regner@xxxxxxxxx>
Date: Sat, 2 Aug 2003 08:31:15 +0200
Guy Harris wrote:

>
>On Friday, August 1, 2003, at 2:50 AM, Deng, Luke Hao (Luke) wrote:
>
>> Yes. In ethereal, protocol tree of frame 22 is printed very well.
>
>That's odd.  It's behaving as if, on the first time the packet is 
>dissected, it recognizes it as an H.245 packet if it's not building a 
>protocol tree but not if it is, but after that, it recognizes it as 
>H.245 even if it's building a protocol tree.
>
>Ethereal 0.9.14 has an H.245 dissector built into it, and the current 
>CVS version of Ethereal has an H.225 dissector built into it; it might 
>be interesting to try your capture with Ethereal 0.9.14.


I got the same behaviour as Luke when I tried with some captures, e.g. the sample available on the Ethereal web
http://www.ethereal.com/sample/rtp_example.raw.gz

I tried this with Ethereal version 0.9.13a, 0.9.10 and 0.9.8  on Windows 98 and get similar resuls with all these versions.

H.245, RTP and RTCP is not working in verbose mode, but H.225 is working when using verbose mode as you see below:

<tethereal -r rtp_example_raw.gz -R h245

 15   1.224703 82    10.1.6.18 -> 10.1.3.143   32804 1232 H.245 TerminalCapabili
tySet
 17   1.228962 65    10.1.6.18 -> 10.1.3.143   32804 1232 H.245 MasterSlaveDeter
mination
 19   1.260281 103   10.1.3.143 -> 10.1.6.18    1232 32804 H.245 TerminalCapabil
itySet
 20   1.261514 65   10.1.3.143 -> 10.1.6.18    1232 32804 H.245 MasterSlaveDeter
mination
 22   1.331996 67   10.1.3.143 -> 10.1.6.18    1232 32804 H.245 TerminalCapabili
tySetAck MasterSlaveDeterminationAck
 24   1.367236 61    10.1.6.18 -> 10.1.3.143   32804 1232 H.245 TerminalCapabili
tySetAck
 26   1.404279 60    10.1.6.18 -> 10.1.3.143   32804 1232 H.245 MasterSlaveDeter
minationAck
 28   1.454561 78   10.1.3.143 -> 10.1.6.18    1232 32804 H.245 OpenLogicalChann
el
 29   1.481158 77    10.1.6.18 -> 10.1.3.143   32804 1232 H.245 OpenLogicalChann
el
 31   1.512165 84   10.1.3.143 -> 10.1.6.18    1232 32804 H.245 OpenLogicalChann
elAck
 32   1.604745 85    10.1.6.18 -> 10.1.3.143   32804 1232 H.245 OpenLogicalChann
elAck

*** OK ***

=============================================

<tethereal -r rtp_example_raw.gz -V -R h245

***nothing is printed.  Not OK ***

=============================================

<tethereal -r rtp_example_raw.gz -R frame.number==28

 28   1.454561 78   10.1.3.143 -> 10.1.6.18    1232 32804 H.245 OpenLogicalChann
el

*** OK ***

=============================================

<tethereal -r rtp_example_raw.gz -V -R frame.number==28

Ethernet II, Src: 00:04:76:22:20:17, Dst: 00:d0:50:10:01:66
    Destination: 00:d0:50:10:01:66 (00:d0:50:10:01:66)
    Source: 00:04:76:22:20:17 (00:04:76:22:20:17)
    Type: IP (0x0800)
Internet Protocol, Src Addr: 10.1.3.143 (10.1.3.143), Dst Addr: 10.1.6.18 (10.1.
6.18)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 64
    Identification: 0x0453
    Flags: 0x04
        .1.. = Don't fragment: Set
        ..0. = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (0x06)
    Header checksum: 0x18c3 (correct)
    Source: 10.1.3.143 (10.1.3.143)
    Destination: 10.1.6.18 (10.1.6.18)
Transmission Control Protocol, Src Port: 32804 (32804), Dst Port: 1232 (1232), S
eq: 3423569605, Ack: 3715142130, Len: 24
    Source port: 32804 (32804)
    Destination port: 1232 (1232)
    Sequence number: 3423569605
    Next sequence number: 3423569629
    Acknowledgement number: 3715142130
    Header length: 20 bytes
    Flags: 0x0018 (PSH, ACK)
        0... .... = Congestion Window Reduced (CWR): Not set
        .0.. .... = ECN-Echo: Not set
        ..0. .... = Urgent: Not set
        ...1 .... = Acknowledgment: Set
        .... 1... = Push: Set
        .... .0.. = Reset: Not set
        .... ..0. = Syn: Not set
        .... ...0 = Fin: Not set
    Window size: 5840
    Checksum: 0xdf49 (correct)
Data (24 bytes)

0000  03 00 00 18 03 00 00 64 0c 20 1d 80 0b 0d 00 01   .......d. ......
0010  00 0a 01 03 8f 13 89 80                           ........

**** i.e. not shown as H.245. Not OK  ****

=============================================

<tethereal -r rtp_example_raw.gz -R h225

  4   0.019061 214   10.1.3.143 -> 10.1.6.18    h225 32803 H.225.0 CS: Setup-UUI
E
  6   0.241725 118    10.1.6.18 -> 10.1.3.143   32803 h225 H.225.0 CS: CallProce
eding-UUIE
  8   0.419123 118    10.1.6.18 -> 10.1.3.143   32803 h225 H.225.0 CS: Alerting-
UUIE
 10   1.046808 151    10.1.6.18 -> 10.1.3.143   32803 h225 H.225.0 CS: Connect-U
UIE

*** OK ***

=============================================

<tethereal -r rtp_example_raw.gz -R h225

:
:
        .... ...0 = Fin: Not set
    Window size: 8192
    Checksum: 0xf533 (correct)
TPKT
    Version: 3
    Reserved: 0
    Length: 97
Q.931
    Protocol discriminator: Q.931
    Call reference value length: 2
    Call reference flag: Message sent to originating side
    Call reference value: 77F4
    Message type: CONNECT (0x07)
    Display
        Information element: Display
        Length: 7
        Display information: M.JEMEC
    User-user
        Information element: User-user
        Length: 76
        Protocol discriminator: X.208 and X.209 coded user information
ITU-T Recommendation H.225.0
    h323_uu_pdu (H323-UU-PDU)
        h323_message_body (connect)
            connect
                protocolIdentifier: 0.0.8.2250.0.3
                h245Address (ipAddress)
                    ipAddress
                        ip: 10.1.6.18 (10.1.6.18)
                        port: 1232
                destinationInfo (EndpointType)
                    vendor (VendorIdentifier)
                        vendor (H221NonStandard)
                            t35CountryCode: 0
                            t35Extension: 0
                            manufacturerCode: 0
                        productId: 310i
                        versionId: R
                    terminal (TerminalInfo)
                    mc: False
                    undefinedNode: False
                conferenceID: F8FDF93E-CD9E-D611-9AB2-000476222017
                callIdentifier (CallIdentifier)
                    guid: C0FEF93E-CD9E-D611-9AB2-000476222017
                multipleCalls: False
                maintainConnection: False
        h245Tunneling: False


*** H225 works OK ***

=============================================

<tethereal -r rtp_example_raw.gz -R rtp

:
:
489   8.542281 294   10.1.3.143 -> 10.1.6.18    2006 5000 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=3739283087, Seq=59363, Time=55440
490   8.547536 294    10.1.6.18 -> 10.1.3.143   5000 2006 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=4090175489, Seq=9825, Time=54240
491   8.572393 294   10.1.3.143 -> 10.1.6.18    2006 5000 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=3739283087, Seq=59364, Time=55680
492   8.578128 294    10.1.6.18 -> 10.1.3.143   5000 2006 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=4090175489, Seq=9826, Time=54480
493   8.602306 294   10.1.3.143 -> 10.1.6.18    2006 5000 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=3739283087, Seq=59365, Time=55920
494   8.608235 294    10.1.6.18 -> 10.1.3.143   5000 2006 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=4090175489, Seq=9827, Time=54720
495   8.632418 294   10.1.3.143 -> 10.1.6.18    2006 5000 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=3739283087, Seq=59366, Time=56160
496   8.636269 294    10.1.6.18 -> 10.1.3.143   5000 2006 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=4090175489, Seq=9828, Time=54960
497   8.662488 294   10.1.3.143 -> 10.1.6.18    2006 5000 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=3739283087, Seq=59367, Time=56400
498   8.667984 294    10.1.6.18 -> 10.1.3.143   5000 2006 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=4090175489, Seq=9829, Time=55200
499   8.692673 294   10.1.3.143 -> 10.1.6.18    2006 5000 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=3739283087, Seq=59368, Time=56640


*** OK ***

=============================================

<tethereal -r rtp_example_raw.gz -V -R rtp

***nothing is printed. Not OK ***


=============================================

<tethereal -r rtp_example_raw.gz -R frame.number==495

495   8.632418 294   10.1.3.143 -> 10.1.6.18    2006 5000 RTP Payload type=ITU-T
 G.711 PCMA, SSRC=3739283087, Seq=59366, Time=56160

*** OK ***

=============================================

<tethereal -r rtp_example_raw.gz -V -R frame.number==495

Internet Protocol, Src Addr: 10.1.3.143 (10.1.3.143), Dst Addr: 10.1.6.18 (10
6.18)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x10 (DSCP 0x04: Unknown DSCP; ECN: 0x00)
        0001 00.. = Differentiated Services Codepoint: Unknown (0x04)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 280
    Identification: 0x0000
    Flags: 0x04
        .1.. = Don't fragment: Set
        ..0. = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: UDP (0x11)
    Header checksum: 0x1c23 (correct)
    Source: 10.1.3.143 (10.1.3.143)
    Destination: 10.1.6.18 (10.1.6.18)
User Datagram Protocol, Src Port: 5000 (5000), Dst Port: 2006 (2006)
    Source port: 5000 (5000)
    Destination port: 2006 (2006)
    Length: 260
    Checksum: 0xde82 (correct)
Data (252 bytes)

0000  80 08 e7 e6 00 00 db 60 de e0 ee 8f 4a d5 4a 4a   .......`....J.JJ
0010  5a 5a 72 d5 5a 5a 72 5a 72 5a 5a d5 72 72 5a 4a   ZZr.ZZrZrZZ.rrZJ
0020  4a 5a 5a 66 d5 72 5a 72 d5 4a 5a 5a 4a 4a 4a 72   JZZf.rZr.JZZJJJr
0030  5a 5a 72 4a 72 5a 4a d5 72 4a 4a 5a 4a 4a 4a 5a   ZZrJrZJ.rJJZJJJZ
0040  5a 4a 72 72 4a 4a 72 4a 72 4a 72 4a 4a 4a 72 5a   ZJrrJJrJrJrJJJrZ
0050  4a 7a 72 72 7a 72 4a 72 4a 7a 72 72 4a 4a 72 7a   JzrrzrJrJzrrJJrz
0060  5a 4a 72 4a 7a 7a 72 72 7a 72 4a 66 4a 4a 72 7a   ZJrJzzrrzrJfJJrz
0070  72 72 66 4a 7a 72 7a 72 7a 7a 4a 72 7a 72 72 7a   rrfJzrzrzzJrzrrz
0080  7a 72 66 72 72 72 7a 72 7a 7a 72 4a 7a 7a 72 72   zrfrrrzrzzrJzzrr
0090  7a 4a 7a 72 72 66 7a 7a 4a 66 72 4a 72 72 7a 4a   zJzrrfzzJfrJrrzJ
00a0  66 5a 62 4a 62 5a 66 d5 66 7a 7a 5a 7a 72 7a 5a   fZbJbZf.fzzZzrzZ
00b0  7a 4a 7a 7a 7a 4a 66 72 4a 72 72 72 7a 7a 4a 72   zJzzzJfrJrrrzzJr
00c0  7a 72 72 4a 72 7a 7a 7a 7a 7a 72 5a 72 72 7a d5   zrrJrzzzzzrZrrz.
00d0  7a 4a 66 4a 66 4a 72 d5 4a 5a 72 72 4a 4a 4a 72   zJfJfJr.JZrrJJJr
00e0  5a 7a 4a 72 4a 72 4a 4a 66 5a 72 4a 72 d5 66 5a   ZzJrJrJJfZrJr.fZ
00f0  72 4a 4a 5a 4a 72 f5 5a 4a 4a d5 4a               rJJZJr.ZJJ.J

*** RTP packet shown as UDP. Not OK ***

=============================================

I will probably not have so much time to look into this closer right now, but can maybe try with the new H.225/H.245 dissectors
in sa few days.

I also think it's very strange that I haven't noticed this problem before. I'm sometimes using some bat-scripts that uses tethereal to extract 
h245 and h225 messages with similar options. Most of my captures are with tunneled H.245 though, so that may
explain why I haven't found out that non-tunneled H.245 messages are missing. 
I will try to check the behaviour on my other computer that I'm normally using for analysing H.225/H.245.