[OpenSIPS-Users] Odd URI formatting issue when using Exec to return a variable
Ben Bliss
ben.bliss at telxl.com
Wed Nov 15 10:19:54 UTC 2023
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>
Sent: Wednesday, November 15, 2023 7:30 AM
To: 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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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
https://www.opensips-solutions.com<https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fwww.opensips-solutions.com&c=E,1,n_ThlRNU3i-MoIo_dhzoLTuWEvWUOlYVNSDoisTDDrwzbpcftjAa4w_2PyxMOisnPvCBiGpAygCZjMhqUzFW_eo3M1DZs60QBAwbpZYM6fdEYEdZt7_0&typo=1>
https://www.siphub.com<https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fwww.siphub.com&c=E,1,FaWC5zmYssK-iGLeBMdcpIfqOyqXzRepdKxkoIroZfSn0rDpGcOHq3E-rAA6pLhypuKjMgc8st1DlBDvpaiolXtmHYeW9PIxKMk9l27g6Jmoso3H5n9a6tC2bOqe&typo=1>
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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