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### Description
When using `auth_ephemeral` module I found that using anything other than the default sha1 would fail and crash Kamailio.
<!--
Explain what you did, what you expected to happen, and what actually happened.
-->
### Troubleshooting
#### Log Messages
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Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site).
-->
```
*** stack smashing detected ***: <unknown> terminated
13(85) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 15
0(65) ALERT: <core> [main.c:788]: handle_sigs(): child process 77 exited by a signal 6
0(65) ALERT: <core> [main.c:791]: handle_sigs(): core was generated
```
#### SIP Traffic
<!--
If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site).
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```
N/A
```
### Possible Solutions
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If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix.
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I dug into the code and have a Pull Request to fix the issue.
https://github.com/kamailio/kamailio/pull/2962
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.6.0-dev2 (x86_64/linux) 3c905e
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_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_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
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: 3c905e -dirty
compiled on 11:02:49 Dec 4 2021 with gcc 8.3.0
```
* **Operating System**:
<!--
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Kernel details (output of `lsb_release -a` and `uname -a`)
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```
Docker debian:debian on MacOS Mojave 10.14
Linux 47b9de1080dc 5.10.47-linuxkit #1 SMP Sat Jul 3 21:51:47 UTC 2021 x86_64 GNU/Linux
```
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Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/2963
Hello,
it is time to mark the end of official packaging for 5.3.x releases,
therefore during the next days I am going to cut the v5.3.9 release from
branch 5.3, likely on Wednesday, Dec 8, 2021.
In other words, if no major regression is detected shortly after this
release, the v5.3.9 is going to be the last one from the 5.3 branch.
It is strongly recommended to move to a series that is under active
maintenance, respectively 5.5.x or 5.4.x.
Cheers,
Daniel
--
Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - Online
Feb 21-24, 2022 (America Timezone)
* https://www.asipto.com/sw/kamailio-advanced-training-online/
Anchors like ^ and $ match beginning resp. ending of strings but their
matches are zero length, which is ok.
The anchors can be used to pre-/append a prefix/suffix via e.g.
subst_hf("X-My-Header", "/^/prefix /", "a");
subst_hf("X-My-Header", "/$/ suffix/", "a");
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- backports to stable branches must be done with 'git cherry-pick -x ...'
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#### Pre-Submission Checklist
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<!-- All points should be verified, otherwise, read the CONTRIBUTING guidelines from above-->
<!-- If you're unsure about any of these, don't hesitate to ask on sr-dev mailing list -->
- [x] Commit message has the format required by CONTRIBUTING guide
- [x] Commits are split per component (core, individual modules, libs, utils, ...)
- [x] Each component has a single commit (if not, squash them into one commit)
- [x] No commits to README files for modules (changes must be done to docbook files
in `doc/` subfolder, the README file is autogenerated)
#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)
#### Checklist:
<!-- Go over all points below, and after creating the PR, tick the checkboxes that apply -->
- [ ] PR should be backported to stable branches
- [ ] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)
#### Description
<!-- Describe your changes in detail -->
You can view, comment on, or merge this pull request online at:
https://github.com/kamailio/kamailio/pull/2869
-- Commit Summary --
* <a href="https://github.com/kamailio/kamailio/pull/2869/commits/63190fb0f0580a276146…">core: allow empty matches</a>
-- File Changes --
M src/core/data_lump.c (2)
M src/core/re.c (4)
-- Patch Links --
https://github.com/kamailio/kamailio/pull/2869.patchhttps://github.com/kamailio/kamailio/pull/2869.diff
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