From notifications@github.com Sat Aug  7 13:03:17 2021
From: jpskriver <notifications@github.com>
To: sr-dev@lists.kamailio.org
Subject: [sr-dev] [kamailio/kamailio] Kamailio unable to relay ACK (response
 to 200 OK) with TCP connection (#2814)
Date: Sat, 07 Aug 2021 04:03:12 -0700
Message-ID: <kamailio/kamailio/issues/2814@github.com>
MIME-Version: 1.0
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--===============1030990185==
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### Description
The ACK that response to 200 OK was NAT relayed by Kamailio if using TCP prot=
ocol, then got this issue from log=20
```pending write on new connection 0x14a595095d40 sock 16 (-1/539 bytes writt=
en) (err: 11 - Resource temporarily unavailable)```

<!--
Explain what you did, what you expected to happen, and what actually happened.
-->

### Troubleshooting

#### Reproduction
* Using KAMI with Lua for routing config.
* make call between 2 sip clients, the receiver has been registered with TCP

#### Debugging Data
* With the same scenario with UDP, it work fine.
*=20

<!--
If you got a core dump, use gdb to extract troubleshooting data - full backtr=
ace,
local variables and the list of the code at the issue location.

  gdb /path/to/kamailio /path/to/corefile
  bt full
  info locals
  list

If you are familiar with gdb, feel free to attach more of what you consider to
be relevant.
-->

```
(paste your debugging data here)
```

#### Log Messages

<!--
Check the syslog file and if there are relevant log messages printed by Kamai=
lio, add them next, or attach to issue, or provide a link to download them (e=
.g., to a pastebin site).
-->

```
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <script>: ROUTE RELAY BEGIN:=
-----------------------------------------------------------
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: tm [t_lookup.c:1327]: t_newt=
ran(): msg (0x14a5999f0b38) id=3D3/4784 global id=3D2/4784 T start=3D0xffffff=
ffffffffff
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: tm [t_lookup.c:497]: t_looku=
p_request(): start searching: hash=3D41830, isACK=3D1
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: tm [t_lookup.c:455]: matchin=
g_3261(): RFC3261 transaction matching failed - via branch [z9hG4bKQe8H61SrNc=
aXD]
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: tm [t_lookup.c:675]: t_looku=
p_request(): no transaction found
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: tm [t_funcs.c:286]: t_relay_=
to(): forwarding ACK statelessly
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <core> [core/crypto/md5utils=
.c:67]: MD5StringArray(): MD5 calculated: 66c47e5249a7009267e0cd264863c247
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <core> [core/msg_translator.=
c:1797]: check_boundaries(): no multi-part body
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <core> [core/forward.c:577]:=
 forward_request(): Sending:#012ACK sip:Joe%20Biden(a)14.186.XXX.XX:60791;tra=
nsport=3DTCP SIP/2.0#015#012Via: SIP/2.0/TCP 188.166.XXX.XX:5060;branch=3Dz9h=
G4bK663a.66c47e5249a7009267e0cd264863c247.0#015#012Via: SIP/2.0/UDP 127.0.0.2=
;received=3D127.0.0.2;rport=3D5060;branch=3Dz9hG4bKQe8H61SrNcaXD#015#012Max-F=
orwards: 69#015#012From: "Donald Trump"
 <sip:33123456789(a)127.0.0.2>;tag=3DmUNavKm60XZte#015#012To: <sip:5512345(a)=
127.0.0.3:5060;transport=3Dudp>;tag=3Dbd21bf6b#015#012Call-ID: 0e846d85-720e-=
123a-45a5-ea0e9328da5f#015#012CSeq: 39612479 ACK#015#012Contac
t: <sip:gw+KamGW(a)127.0.0.2:5060;transport=3Dudp;gw=3DKamGW>#015#012Content-=
Length: 0#015#012#015#012.
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <core> [core/forward.c:578]:=
 forward_request(): orig. len=3D557, new_len=3D539, proto=3D2
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: app_lua [app_lua_api.c:489]:=
 sr_lua_reload_script(): No need to reload [/path-to-lua/routing.lua] is vers=
ion 0
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: app_lua [app_lua_api.c:673]:=
 app_lua_run_ex(): executing Lua function: [[ksr_onsend_route]]
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: app_lua [app_lua_api.c:675]:=
 app_lua_run_ex(): lua top index is: 0
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <core> [core/tcp_main.c:1993=
]: tcp_send(): no open tcp connection found, opening new one
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <core> [core/ip_addr.c:577]:=
 print_ip(): tcpconn_new: new tcp connection: 14.186.47.222
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <core> [core/tcp_main.c:1175=
]: tcpconn_new(): on port 60791, type 2, socket -1
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <core> [core/tcp_main.c:1494=
]: tcpconn_add(): hashes: 1566:2785:0, 4
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: <core> [core/tcp_main.c:2886=
]: tcpconn_1st_send(): pending write on new connection 0x14a595095d40 sock 16=
 (-1/539 bytes written) (err: 11 - Resource temporar
ily unavailable)
Aug  7 10:35:53 testnode1 /usr/local/sbin/kamailio[4806]: DEBUG: <core> [core=
/tcp_main.c:3792]: handle_ser_child(): read response=3D 14a595095d40, 5, fd 5=
5 from 12 (4784)
Aug  7 10:35:53 testnode1 /usr/local/sbin/kamailio[4806]: DEBUG: <core> [core=
/io_wait.h:375]: io_watch_add(): DBG: io_watch_add(0x55f0338266a0, 55, 2, 0x1=
4a595095d40), fd_no=3D41
Aug  7 10:35:53 testnode1 testnode[4784]: DEBUG: app_lua [app_lua_api.c:1003]=
: sr_kemi_lua_exec_func_ex(): param[0] for: xdbg is str: ROUTE RELAY END:----=
----------------------------------------------------
---

```

#### SIP Traffic

![image](https://user-images.githubusercontent.com/85822466/128597726-0f64fde=
c-9b45-4ef6-b480-f5c0b3f21600.png)

```
(paste your sip traffic here)
```

### Possible Solutions

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

### Additional Information

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

```
kamailio -v
version: kamailio 5.5.1 (x86_64/linux) 7abebb
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, U=
SE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC,=
 DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FA=
ILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHAR=
ED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF=
_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 7abebb=20
compiled on 07:46:14 Jun 27 2021 with gcc 8.3.0
```

* **Operating System**:

<!--
Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubunt=
u 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
-->
Debian 10.10
```
root(a)testnode1:~# uname -a
Linux testnode1 4.19.0-12-cloud-amd64 #1 SMP Debian 4.19.152-1 (2020-10-18) x=
86_64 GNU/Linux
```


--=20
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--===============1030990185==--


From notifications@github.com Thu Aug 12 05:28:22 2021
From: Myng <notifications@github.com>
To: sr-dev@lists.kamailio.org
Subject: Re: [sr-dev] [kamailio/kamailio] Kamailio unable to relay ACK
 (response to 200 OK) with TCP connection (#2814)
Date: Wed, 11 Aug 2021 20:28:20 -0700
Message-ID: <kamailio/kamailio/issues/2814/897321198@github.com>
In-Reply-To: <kamailio/kamailio/issues/2814@github.com>
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--===============0359370409==
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I got the same issue, seem like it's the nat map. fixed by using `handle_ruri=
_alias` in relay block

--=20
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Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/2814#issuecomment-897321198



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--===============0359370409==--


From notifications@github.com Thu Aug 12 05:35:18 2021
From: jpskriver <notifications@github.com>
To: sr-dev@lists.kamailio.org
Subject: Re: [sr-dev] [kamailio/kamailio] Kamailio unable to relay ACK
 (response to 200 OK) with TCP connection (#2814)
Date: Wed, 11 Aug 2021 20:35:16 -0700
Message-ID: <kamailio/kamailio/issue/2814/issue_event/5146400318@github.com>
In-Reply-To: <kamailio/kamailio/issues/2814@github.com>
MIME-Version: 1.0
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--===============0841411540==
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Closed #2814.

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