[BUG] PacketRusher crashes during UE processing if you use a gNodeB id with a hex digit

[rjaksa]

Describe the bug
PacketRusher crashes during UE processing if you use a gNodeB id with a hex digit in the config.yml file.

To Reproduce
Steps to reproduce the behavior:

1. Verify system is working with decimal gNodeB id in config.yml

tac: "0228BC"
gnbid: "000009"

2. Change gNodeB id to have one or more hex digits in config.yml

tac: "0228BC"
gnbid: "00000A"

Expected behavior
In case 1 (gNodeB with decimal digits), PacketRusher works fine.
In case 2 (gNodeB with hex digits), PacketRusher crashes (but should not).

Screenshots

Successful case:

...
INFO[0000] [GNB][AMF] List of AMF slices Supported by AMF -- sst:01 sd:was not informed
INFO[0001] [TESTER] TESTING REGISTRATION USING IMSI 000000001 UE
INFO[0001] [GNB] Received incoming connection from new UE
INFO[0001] [UE] Initiating Registration
INFO[0001] [UE] Switched from state 0 to state 1
INFO[0001] [GNB][SCTP] Receive message in 1 stream
INFO[0001] [GNB][NGAP] Receive Downlink NAS Transport
INFO[0001] [UE][NAS] Message without security header
INFO[0001] [UE][NAS] Receive Authentication Request
...

Failure case:

...
INFO[0000] [GNB][AMF] List of AMF slices Supported by AMF -- sst:01 sd:was not informed
INFO[0001] [TESTER] TESTING REGISTRATION USING IMSI 000000001 UE
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0xa0 pc=0x7c7d53]

goroutine 19 [running]:
my5G-RANTester/internal/control_test_engine/gnb/context.(*GNBContext).GetInboundChannel(...)
/home/john/PacketRusher/internal/control_test_engine/gnb/context/context.go:134
my5G-RANTester/internal/common/tools.SimulateSingleUE.func2(0xc0000c0000, 0x0?)
/home/john/PacketRusher/internal/common/tools/tools.go:131 +0xd3
created by my5G-RANTester/internal/common/tools.SimulateSingleUE in goroutine 1
/home/john/PacketRusher/internal/common/tools/tools.go:124 +0x31c
...

[linouxis9]

Hi @rjaksa,

Thanks a lot for your heavy testing of PacketRusher and opening all these bugs!
This issue has been fixed in the main branch.

Thanks again!

Cheers,
Valentin