New subject: [kamailio/kamailio] Issues with PUA_REGINFO module (#1579)

2 Jul 2018

### Description
While testing to implement an IMS AS, I used the PUA_REGINFO module to receive details
about the SIP registration. PUA_REGINFO module uses PUA and USRLOC modules.

However, a couple of issues was found including a crash: 

1) Crash when processing SIP Notify with registration terminated info.
2) Randomly fails storing data to USRLOC, (entries already exists)
3) Saves corrupt data to database use_domain is set in usrloc but domain not provided in
Notify request

### Troubleshooting
I am pretty new to Kamailio, but my findings are the following in notify.c

1) PUA_REGINFO modules, deletes the record with "ul.delete_urecord(...)" and
later down in the code calls  "if (ul_record) ul.release_urecord(ul_record);".  
Crashes on the release_urecord call.
My assumption without knowing to much about userloc is that release can not be called on a
deleted record. Hence it should be enough to set ul_record = NULL after calling
"ul.delete_urecord(...)" to not call release_urecord later on.

2) It looks like there is an issue handling parallell request.
Without knowing too much, it replacing sruid_next(..) with sruid_next_safe() resolves the
issue. 
Also, the static variable of type ucontact_info_t should probably become local as well.

3) Maybe incorrect to set use_domain to 1 when using the module, however I think it should
be failsafe and not store garbage data in to database.  Not looked into this issue.

#### Reproduction
Send Notify request with REGINFO body for registration and unregistration and forward it
to the module according to the documentation of PUA_REGINFO.

#### Debugging Data
Attaching SIPp scenario.
Changing code according to 1) and 2) make the SIPp script runs and no critical issues
seen.
(Have too less experience to ensure that no memleaks are introduced or still present in
the module code)

<?xml version="1.0" encoding="ISO-8859-1" ?>

<scenario name="notify">
  <send retrans="500">
    <![CDATA[                                                                          

      NOTIFY sip:[remote_ip] SIP/2.0                                                      

      Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]                    

      From: <sip:[field0]@[field1]>;tag=[call_number]                               

      To: <sip:[field0]@[field1]>                                                   

      Call-ID: [call_id]                                                                  

      CSeq: 1 NOTIFY                                                                      

      Contact: sip:[field0]@[local_ip]:[local_port]                                       

      Max-Forwards: 70                                                                    

      Expires: 1800                                                                       

      Event: reg                                                                          

      User-Agent: SIPp/Linux                                                              

      Subscription-State: active;expires=6888                                             

      Content-Type: application/reginfo+xml                                               

      Content-Length: [len]                                                               

      <?xml version="1.0"?>                                               

      <reginfo xmlns="urn:ietf:params:xml:ns:reginfo" version="2"
state="full">                                                                

        <registration aor="sip:[field0]@mnc001.mcc001.3gppnetwork.org"
id="0x7feff71118f8" state="active">                                

          <contact id="0x7feff7126e58" state="active"
event="registered" expires="595" q="0.500">              

<uri>sip:[field0]@192.168.55.103:21061;ob;alias=192.168.55.103~21061~1</uri>  

              <unknown-param name="+g.3gpp.smsip"></unknown-param>  

              <unknown-param
name="q">"0.5"</unknown-param>                               

          </contact>                                                                

          </registration>                                                           

     </reginfo>                                                                     

    ]]>
  </send>

  <recv response="202" rtd="true">
  </recv>

  <pause milliseconds="1000"/>

  <send retrans="500">
    <![CDATA[                                                                          

     NOTIFY sip:[remote_ip] SIP/2.0                                                       

     Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]                     

     From: <sip:[field0]@[field1]>;tag=[call_number]                                

     To: <sip:[field0]@[field1]>                                                    

     Call-ID: [call_id]                                                                   

     CSeq: 2 NOTIFY                                                                       

     Contact: sip:[field0]@[local_ip]:[local_port]                                        

     Max-Forwards: 70                                                                     

     Expires: 1800                                                                        

     User-Agent: SIPp/Linux                                                               

     Event: reg                                                                           

     Subscription-State: active;expires=6888                                              

     Content-Type: application/reginfo+xml                                                

     Content-Length: [len]                                                                

     <?xml version="1.0"?>                                                

     <reginfo xmlns="urn:ietf:params:xml:ns:reginfo" version="3"
state="full">                                                                

       <registration aor="sip:[field0]@mnc001.mcc001.3gppnetwork.org"
id="0x7feff71118f8" state="terminated">
         <contact id="0x1" state="terminated"
event="expired" expires="0" q="0.000">

<uri>sip:[field0]@192.168.55.103:21061;ob;alias=192.168.55.103~21061~1</uri>
         </contact>
       </registration>
     </reginfo>
    ]]>
  </send>

  <recv response="202" rtd="true">
  </recv>

</scenario>

#### Log Messages
#### SIP Traffic

### Possible Solutions
See troubleshooting.

### Additional Information

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

```
5.1.4
```

* **Operating System**:

```
Debian 8.11
```

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