Cannot add regex containing comma in v6

[patrickli]

Versions

• Pi-hole: development-v6 af9b8d
• AdminLTE: development-v6 e0ca2b2
• FTL: development-v6 vDev-6e25f5c

Platform

• OS and version: Alpine

• Platform: Docker

Expected behavior

Trying to add a regex deny string ^www\.google\.[[:alpha:]]{2,3}(\.[[:alpha:]]{2})?$;reply=216.239.38.120.
It should be added successfully.

Actual behavior / bug

The regex is break into 2 items. It seems FTL is splitting the string by comma. This is not a good idea as comma means something in regex. I can add it successfully in v5.17.2.

A couple of times this also caused a segfault.

Docker log:

2023-11-15 16:33:46.596 [159/T168] WARNING: API: Regex validation failed (Missing '}')
2023-11-15 16:33:46.596 [159/T168] INFO: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
2023-11-15 16:33:46.596 [159/T168] INFO: ---------------------------->  FTL crashed!  <----------------------------
2023-11-15 16:33:46.596 [159/T168] INFO: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
2023-11-15 16:33:46.596 [159/T168] INFO: Please report a bug at https://github.com/pi-hole/FTL/issues
2023-11-15 16:33:46.596 [159/T168] INFO: and include in your report already the following details:
2023-11-15 16:33:46.596 [159/T168] INFO: FTL has been running for 55 seconds
2023-11-15 16:33:46.596 [159/T168] INFO: FTL branch: development-v6
2023-11-15 16:33:46.596 [159/T168] INFO: FTL version: vDev-6e25f5c
2023-11-15 16:33:46.597 [159/T168] INFO: FTL commit: 6e25f5ce
2023-11-15 16:33:46.597 [159/T168] INFO: FTL date: 2023-11-13 22:53:43 +0100
2023-11-15 16:33:46.597 [159/T168] INFO: FTL user: started as pihole, ended as pihole
2023-11-15 16:33:46.597 [159/T168] INFO: Compiled for linux/amd64 (compiled on CI) using cc (Alpine 12.2.1_git20220924-r10) 12.2.1 20220924
2023-11-15 16:33:46.597 [159/T168] INFO: Process details: MID: 159
2023-11-15 16:33:46.597 [159/T168] INFO:                  PID: 159
2023-11-15 16:33:46.597 [159/T168] INFO:                  TID: 168
2023-11-15 16:33:46.597 [159/T168] INFO:                  Name: civetweb-worker
2023-11-15 16:33:46.597 [159/T168] INFO: Received signal: Segmentation fault
2023-11-15 16:33:46.597 [159/T168] INFO:      at address: 0x10
2023-11-15 16:33:46.597 [159/T168] INFO:      with code:  SEGV_MAPERR (Address not mapped to object)
2023-11-15 16:33:46.597 [159/T168] INFO: !!! INFO: pihole-FTL has not been compiled with glibc/backtrace support, not generating one !!!
2023-11-15 16:33:46.597 [159/T168] INFO: ------ Listing content of directory /dev/shm ------
2023-11-15 16:33:46.597 [159/T168] INFO: File Mode User:Group      Size  Filename
2023-11-15 16:33:46.597 [159/T168] INFO: rwxrwxrwx root:root       280  .
2023-11-15 16:33:46.597 [159/T168] INFO: rwxr-xr-x root:root       340  ..
2023-11-15 16:33:46.597 [159/T168] INFO: rw------- pihole:pihole   544K  FTL-fifo-log
2023-11-15 16:33:46.597 [159/T168] INFO: rw------- pihole:pihole     4K  FTL-per-client-regex
2023-11-15 16:33:46.597 [159/T168] INFO: rw------- pihole:pihole    12K  FTL-dns-cache
2023-11-15 16:33:46.597 [159/T168] INFO: rw------- pihole:pihole     8K  FTL-overTime
2023-11-15 16:33:46.597 [159/T168] INFO: rw------- pihole:pihole   262K  FTL-queries
2023-11-15 16:33:46.597 [159/T168] INFO: rw------- pihole:pihole    20K  FTL-upstreams
2023-11-15 16:33:46.597 [159/T168] INFO: rw------- pihole:pihole    86K  FTL-clients
2023-11-15 16:33:46.597 [159/T168] INFO: rw------- pihole:pihole    12K  FTL-domains
2023-11-15 16:33:46.598 [159/T168] INFO: rw------- pihole:pihole   292  FTL-counters
2023-11-15 16:33:46.598 [159/T168] INFO: rw------- pihole:pihole    88  FTL-lock
2023-11-15 16:33:46.598 [159/T168] INFO: ---------------------------------------------------
2023-11-15 16:33:46.598 [159/T168] INFO: Please also include some lines from above the !!!!!!!!! header.
2023-11-15 16:33:46.598 [159/T168] INFO: Thank you for helping us to improve our FTL engine!
2023-11-15 16:33:46.598 [159/T168] INFO: Waiting for threads to join
2023-11-15 16:33:46.598 [159/T168] INFO: Thread database (0) is idle, terminating it.
2023-11-15 16:33:46.598 [159/T168] INFO: Thread housekeeper (1) is idle, terminating it.
2023-11-15 16:33:46.598 [159/T168] INFO: Thread DNS client (2) is idle, terminating it.
2023-11-15 16:33:46.598 [159/T168] INFO: All threads joined
2023-11-15 16:33:46.884 [159/T168] INFO: Stored 1/16 API sessions in the database

Steps to reproduce

Steps to reproduce the behavior:

1. Go to 'Domains'
2. Click on 'RegEx Filter'
3. Enter the regex mentioned above and add.
4. See error

[yubiuser]

Thanks for the report, this is a regression of #2707

[DL6ER]

Indeed, we see two bugs here:

1. comma should not be allowed for domains as it is meaningful in regex, and
2. FTL should not unconditionally free memory it may not have allocated when reporting an error.

I will set up bugfixes for both and report back here.

[DL6ER]

I transferred this issue from FTL into the web realm as the issue itself is happening here. There are two bug fixes fixing the two individual issues above on their own:

1. Do not accept comma to separate regex #2835
2. Prevent unconditional free on error reporting FTL#1759