[sr-dev] [kamailio/kamailio] TCP HEP3 Parsing (#1353)

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[sr-dev] [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan

Description

Captured sip on a server using Captagent, when using UDP the destination_ip is parsed from the message itself when using TCP the destination_ip and destination_port is of the server running Kamailio.

Troubleshooting

Reproduction

Sipcapture using Kamailio on TCP

SIP Traffic

T 10.203.134.187:10398 -> 10.203.134.194:9060 [AP]
HEP3.@...................................
Z&.....
.
................
.........

........

.........myhep......SIP/2.0 487 Request cancelled.
Via: SIP/2.0/UDP 10.203.134.187;received=10.203.134.187;rport=5060;branch=z9hG4bKUgUv1StZ9HmgF.
From: "bal bal" <sip:17325559837@10.203.134.187>;tag=ZSNe61tKX2gFp.
To: <sip:[hidden email]>;tag=eee99bc01afb99338debc1f2a2cfb1a1-c5c8.
Call-ID: 3ed76454-5479-1236-b8a0-0688e01b7b70.
CSeq: 115908963 INVITE.
Server: OpenSIPS (2.2.5 (x86_64/linux)).
Content-Length: 0.
.

##```

### Possible Solutions

<!--
If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix.
-->

Using the parsed header, something like: $var(dstip) = $hep(0x004);

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

version: kamailio 5.2.0-dev0 (x86_64/linux)


* **Operating System**:

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Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
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Debian 8.4


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Re: [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan

BTW, the parsing works just fine for UDP, is it done differently?


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Re: [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan
In reply to this post by David Minh Phan

Have you set next core parameter?


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Re: [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan
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yes


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Re: [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan
In reply to this post by David Minh Phan

Is the event route used, like in:


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Re: [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan
In reply to this post by David Minh Phan

Yeah, that is my issue as well


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Re: [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan
In reply to this post by David Minh Phan

I checked the binary of the received packet, on UDP the data is extracted from the packet itself while on TCP it is taken from the connection info (s.ip, s.port, d.ip, d.port)
Maybe with UDP, it uses hep module while with TCP, it uses sipcapture module?


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Re: [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan
In reply to this post by David Minh Phan

I was misled by the comment that parsing is working for UDP, so I thought is more or less same as the other issue ...

Do you use same config for handling UDP and TCP hep traffic? Can you post it somewhere to see what functions are used and then check the code for them?


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Re: [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan
In reply to this post by David Minh Phan

I am using the same server, seeing different results for traffic that arrives over UDP compared to TCP.

####### Global Parameters #########

fork=yes
children=8
tcp_children=8

/* uncomment the next line to disable TCP (default on) */
# disable_tcp=yes

/* IP and port for HEP capturing) */
listen=tcp:HOMER_LISTEN_IF:HOMER_LISTEN_PORT
listen=udp:HOMER_LISTEN_IF:HOMER_LISTEN_PORT

tcp_accept_hep3=1
tcp_accept_no_cl=yes
...

####### Routing Logic ########
modparam("sipcapture", "db_url", "mysql://root:****@*****/****")
modparam("sipcapture", "capture_on", 1)
modparam("sipcapture", "hep_capture_on", 1)
modparam("sipcapture", "insert_retries", 5)
modparam("sipcapture", "insert_retry_timeout", 10)
#new event sipcapture socket
modparam("sipcapture", "nonsip_hook", 1)
#modparam("sipcapture", "capture_node", "homer01")
...

route[STORE] {

	$var(a) = $var(table) + "_" + $var(utc);
	sip_capture("$var(a)");
}
...

event_route[sipcapture:request] {

	#Is it SIP ?
	if($hep(0x00b) == 1)
	{
		#Do parsing internal
		return 1;
	}
	else
	{
		#If report lets proceed here with payload
		xlog("HEP CHUNK PAYLOAD $hep(0x00f) request from $si:$sp\n");
		return 0;
	}
}


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Re: [kamailio/kamailio] TCP HEP3 Parsing (#1353)

David Minh Phan
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Anything odd here?
Should I look somewhere else?


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Re: [kamailio/kamailio] TCP HEP3 invalid destination ip (#1353)

David Minh Phan
In reply to this post by David Minh Phan

The code of the module needs to be analyzed for this case. Maybe @adubovikov or @giavac can provide a quick hint/fix of what is going wrong there.


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Re: [kamailio/kamailio] TCP HEP3 invalid destination ip (#1353)

David Minh Phan
In reply to this post by David Minh Phan

Hi @azigelman - just to double check, would you please share the binary of one of the HEP3 messages received over TCP?
A pcap with a single frame would do. Thanks.


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Re: [kamailio/kamailio] TCP HEP3 invalid destination ip (#1353)

David Minh Phan
In reply to this post by David Minh Phan

Sure:
48 45 50 33 01 cf 00 00 00 01 00 07 02 00 00 00
02 00 07 11 00 00 00 07 00 08 13 c4 00 00 00 08
00 08 13 c6 00 00 00 09 00 0a 5a 27 fd 7d 00 00
00 0a 00 0a 00 0f 22 81 00 00 00 0b 00 07 01 00
00 00 0c 00 0a 00 00 07 d0 00 00 00 03 00 0a 0a
cb 86 80 00 00 00 04 00 0a 0a cb 86 bb 00 00 00
0e 00 0b 6d 79 68 65 70 00 00 00 0f 01 67 4f 50
54 49 4f 4e 53 20 73 69 70 3a 31 30 2e 32 30 33
2e 31 33 34 2e 31 38 37 3a 35 30 36 32 20 53 49
50 2f 32 2e 30 0d 0a 56 69 61 3a 20 53 49 50 2f
32 2e 30 2f 55 44 50 20 31 30 2e 32 30 33 2e 31
33 34 2e 31 32 38 3a 35 30 36 30 3b 62 72 61 6e
63 68 3d 7a 39 68 47 34 62 4b 33 33 35 39 2e 38
35 64 63 31 38 63 31 2e 30 0d 0a 54 6f 3a 20 73
69 70 3a 31 30 2e 32 30 33 2e 31 33 34 2e 31 38
37 3a 35 30 36 32 0d 0a 46 72 6f 6d 3a 20 3c 73
69 70 3a 70 72 6f 62 65 72 40 6c 6f 63 61 6c 68
6f 73 74 3e 3b 74 61 67 3d 33 66 62 32 65 66 31
62 32 38 35 32 65 64 65 32 33 61 38 35 36 33 35
65 62 36 30 64 33 61 66 35 2d 62 33 38 30 0d 0a
43 53 65 71 3a 20 31 30 20 4f 50 54 49 4f 4e 53
0d 0a 43 61 6c 6c 2d 49 44 3a 20 32 33 66 61 64
62 61 65 33 38 66 32 32 35 39 30 2d 32 38 32 36
30 40 30 2e 30 2e 30 2e 30 0d 0a 4d 61 78 2d 46
6f 72 77 61 72 64 73 3a 20 37 30 0d 0a 43 6f 6e
74 65 6e 74 2d 4c 65 6e 67 74 68 3a 20 30 0d 0a
55 73 65 72 2d 41 67 65 6e 74 3a 20 4f 70 65 6e
53 49 50 53 20 28 32 2e 32 2e 35 20 28 78 38 36
5f 36 34 2f 6c 69 6e 75 78 29 29 0d 0a 0d 0a

I already analyzed it and made sure that the data here is correct


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Re: [kamailio/kamailio] TCP HEP3 invalid destination ip (#1353)

David Minh Phan
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Have you found anything? Should I try to patch it as well?


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Re: [kamailio/kamailio] TCP HEP3 invalid destination ip (#1353)

David Minh Phan
In reply to this post by David Minh Phan

At the moment I've only been able to reproduce the issue, but I have no solution yet.
If you spot the issue or find a patch feel free to say and I'll test/review. Thanks.


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Re: [kamailio/kamailio] TCP HEP3 invalid destination ip (#1353)

David Minh Phan
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Closing, see PR #1379.


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Re: [kamailio/kamailio] TCP HEP3 invalid destination ip (#1353)

David Minh Phan
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Closed #1353.


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