[OpenSIPS-Users] Odd URI formatting issue when using Exec to return a variable
Ben Bliss
ben.bliss at telxl.com
Fri Nov 17 08:03:23 UTC 2023
Bogdan,
Thank you for your suggestions.
That has sorted it, the URI is now coming back in the correct format, and the re-direct is now working.
Many thanks!
Ben
From: Bogdan-Andrei Iancu <bogdan at opensips.org>
Sent: Thursday, November 16, 2023 3:05 PM
To: Gregory Massel <greg at switchtel.co.za>; OpenSIPS users mailling list <users at lists.opensips.org>; Ben Bliss <ben.bliss at telxl.com>
Subject: Re: [OpenSIPS-Users] Odd URI formatting issue when using Exec to return a variable
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I agree here, it looks like the exec output has some trailing chars, like an \n .....
Ben, try doing
$branch = $(var(out){s.trim});
See https://opensips.org/Documentation/Script-Tran-3-4#s.trim
Regards,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
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On 11/16/23 3:26 AM, Gregory Massel via Users wrote:
Just wondering if, perhaps, the script return a line terminated with \r\n instead of just \n ? Or perhaps even just a \n is being pulled into the variable?
Perhaps try a {s.trim} transformation?
On 2023-11-15 13:27, Bogdan-Andrei Iancu wrote:
Out of curiosity, if you replace the:
$branch = $var(out);
with
$ru = $var(out)
is the reply properly formed ?
Regards,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
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On 11/15/23 12:19 PM, Ben Bliss wrote:
HI Bogdan,
Thanks for the reply.
I was using 3.2.13, so I have now patched this to 3.2.15, which is the latest version on the 3.2 branch. I repeated the test and got the same behaviour. Please see the below information as requested…
Script…
if ( $si == '10.10.14.71' && is_method("INVITE") ) {
exec("/usr/local/bin/sbc-route", $tU, $var(out));
xlog("Value returned from Re-direct Script is $var(out)");
$branch = $var(out);
xlog("Target is set as $branch");
send_reply(302, "Server Redirect");
exit;
}
Xlog information logged when the call request comes in…
2023-11-15T09:52:55.375039+00:00 uk-rdh-testast2 /usr/sbin/opensips[283656]: Value returned from Re-direct Script is sip:33557719673 at 10.10.4.77
2023-11-15T09:52:55.375456+00:00 uk-rdh-testast2 /usr/sbin/opensips[283656]: Target is set as sip:33557719673 at 10.10.4.77
The 302 response is below, exported from Wireshark…
No. Time Source Destination Protocol Length Info
15 09:53:20.012882 10.10.12.70 10.10.14.71 SIP 666 Status: 302 Server Redirect |
Frame 15: 666 bytes on wire (5328 bits), 666 bytes captured (5328 bits)
Ethernet II, Src: bb:bb:bb:bb:bb:bb (bb:bb:bb:bb:bb:bb), Dst: aa:aa:aa:aa:aa:aa (aa:aa:aa:aa:aa:aa)
Internet Protocol Version 4, Src: 10.10.12.70, Dst: 10.10.14.71
User Datagram Protocol, Src Port: 5070, Dst Port: 5060
Session Initiation Protocol (302)
Status-Line: SIP/2.0 302 Server Redirect
Message Header
From: sip:+4478341xxxxx at 151.x.xxx.x;user=phone;tag=BN1699364674-1-1700041999-377836318
To: sip:+4415279xxxxx at 149.x.xxx.xx;user=phone;tag=5d8f.6023fbda08f41f7e9ebdc611f91805ef
Call-ID: 55197572_103382176 at 151.x.xxx.x<mailto:55197572_103382176 at 151.x.xxx.x>
[Generated Call-ID: 55197572_103382176 at 151.x.xxx.x<mailto:55197572_103382176 at 151.x.xxx.x>]
CSeq: 61414 INVITE
Via: SIP/2.0/UDP 10.10.14.71:5060;branch=z9hG4bK-6a03d713-a7b27-28f11294-7f0923fc1278
Via: SIP/2.0/UDP 149.x.xxx.xx:5060;received=151.x.xxx.x;rport=5060;branch=z9hG4bK1699364674
Via: SIP/2.0/UDP 151.x.xxx.x:5060;branch=z9hG4bK0aB2fefabe20ff62d0e
Contact: <sip:33557719673 at 10.10.4.77
[Expert Info (Warning/Malformed): Header has no colon after the name]
[Header has no colon after the name]
[Severity level: Warning]
[Group: Malformed]
Server: OpenSIPS (3.2.15 (x86_64/linux))
Content-Length: 0
If it is any help, I did try another method of inputting the Contact header, which was using the ‘append_to_reply’ command, rather than using the $branch method, so I just formatted in the URI as such…
append_to_reply('Contact: <$var(out)>');
This pushed the closing > from the ‘Contact’ URI to the “Server” line, as you can see on the outputted 302 below…
No. Time Source Destination Protocol Length Info
17 12:12:01.339034 10.10.12.70 10.10.14.71 SIP 667 Status: 302 Server Redirect |
Frame 17: 667 bytes on wire (5336 bits), 667 bytes captured (5336 bits)
Ethernet II, Src: bb:bb:bb:bb:bb:bb (bb:bb:bb:bb:bb:bb), Dst: aa:aa:aa:aa:aa:aa (aa:aa:aa:aa:aa:aa)
Internet Protocol Version 4, Src: 10.10.12.70, Dst: 10.10.14.71
User Datagram Protocol, Src Port: 5070, Dst Port: 5060
Session Initiation Protocol (302)
Status-Line: SIP/2.0 302 Server Redirect
Message Header
From: sip:+4478341xxxxx at 151.x.xxx.x;user=phone;tag=BN1699364667-1-1699963921-901707368
To: sip:080001xxxxx at 149.x.xxx.xx;user=phone;tag=5d8f.a1daebfe0f15d4035f73e92edd390da9
Call-ID: 55182316_87520217 at 151.x.xxx.x<mailto:55182316_87520217 at 151.x.xxx.x>
[Generated Call-ID: 55182316_87520217 at 151.x.xxx.x<mailto:55182316_87520217 at 151.x.xxx.x>]
CSeq: 706035 INVITE
Via: SIP/2.0/UDP 10.10.14.71:5060;branch=z9hG4bK-34260abf-94a28-2449afc3-7f0920d0abc8
Via: SIP/2.0/UDP 149.x.xxx.xx:5060;received=151.x.xxx.x;rport=5060;branch=z9hG4bK1699364667
Via: SIP/2.0/UDP 151.x.xxx.x:5060;branch=z9hG4bK0aB220722fa7bfe603d
Contact: <sip:33557719673 at 10.10.4.77:5060
>Server: OpenSIPS (3.2.13 (x86_64/linux))
[Expert Info (Note/Undecoded): Unrecognised SIP header (>server)]
[Unrecognised SIP header (>server)]
[Severity level: Note]
[Group: Undecoded]
Content-Length: 0
Whether this is related or not, I cannot say, but thought I would include it in any case.
Many Thanks,
Ben
From: Bogdan-Andrei Iancu <bogdan at opensips.org><mailto:bogdan at opensips.org>
Sent: Wednesday, November 15, 2023 7:30 AM
To: OpenSIPS users mailling list <users at lists.opensips.org><mailto:users at lists.opensips.org>; Ben Bliss <ben.bliss at telxl.com><mailto:ben.bliss at telxl.com>
Subject: Re: [OpenSIPS-Users] Odd URI formatting issue when using Exec to return a variable
CAUTION: This email originated from outside your organization. Exercise caution when opening attachments or clicking links, especially from unknown senders.
Hi Ben,
Could you post the xlog output and the resulting 302 ? Also be sure you are using the latest 3.2 version - please post the `opensips -V` here.
Regards,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
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On 11/14/23 4:00 PM, Ben Bliss wrote:
I am using Opensips v.3.2 and I am attempting to replicate the 302 redirect outlined on the blog (https://blog.opensips.org/2018/07/05/handling-sip-redirect-requests-in-realtime/), but am running into an odd issue.
I am using exec to execute an external program, which returns a URI as a variable, which is then used to populate the $branch field, which is then returned as the contact URI in the 302 response.
For reasons I cannot explain, even though the URI is correctly formatted in the xlogs which I print off during the call request, when the 302 message is received, the Contact URI is missing the end ‘>‘character. This means the server the 302 is being sent to doesn’t ACK the message, as the contact URI is invalid.
If I specify the URI directly within OpenSIPs, then the contact header is then formatted correctly.
Initially I thought the issue was related to the script returning the variable (bash script), so I swapped to a Golang program, essentially returning the same URI, but the same behaviour occurs with this as well.
The script is setup as follows…
if ( $si == '10.10.14.71' && is_method("INVITE") ) {
exec("/usr/local/bin/sbc-route", $tU, $var(out));
xlog("Value returned from Re-direct Script is $var(out)");
$branch = $var(out);
xlog("Target is set as $branch");
send_reply(302, "Server Redirect");
exit;
}
Can anyone offer any ideas as to why this may be occurring?
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