Undecimus: L2TP VPN crash on versions 4.0.1 and above

[sinkuroi]

Description
On unc0ver versions 4.0.1 and above, L2TP VPN does not work. Error message claims that the server did not respond. Same server works fine in non-jailbroken state.

To Reproduce
Steps to reproduce the behavior:

1. Settings
2. VPN
3. Select L2TP VPN configuration
4. Set status to "on"

Screenshots
https://i.imgur.com/G5DlIQk.png

Device:

• iOS Version: 13.3
• iOS Device: iPhone 11
• unc0ver Version: 4.0.3

Place an "x" between the brackets if true:

• [x] this is a bug others will be able to reproduce
• [x] this issue is present with all tweaks uninstalled(except for default packages) or disabled
• [ ] this issue is present after a rootfs restore
• [x] this issue is present on the latest version of unc0ver

Still occurs even with unc0ver option "Load Tweaks" disabled.
Another user on Reddit is having the issue.

Logs
```{"blame":["\/usr\/lib\/substitute-inserter.dylib"],"app_name":"racoon","timestamp":"2020-02-20 11:02:28.37 +0000","app_version":"","slice_uuid":"63aa0053-4a85-36c4-aff4-87fc0c2bc2b7","build_version":"","share_with_app_devs":true,"is_first_party":true,"bug_type":"109","os_version":"iPhone OS 13.3 (17C54)","incident_id":"4805C018-5922-4D64-B592-CD0A108C43BA","name":"racoon","symbolicated":true}
Incident Identifier: 4805C018-5922-4D64-B592-CD0A108C43BA
CrashReporter Key: d0e5f953d78fb6504c1b1457cd92ab6d3b578ea3
Hardware Model: iPhone12,1
Process: racoon [5379]
Path: /usr/sbin/racoon
Identifier: racoon
Version: ???
Code Type: ARM-64 (Native)
Role: Unspecified
Parent Process: launchd [1]
Coalition: com.apple.racoon [902]

Date/Time: 2020-02-20 11:02:28.3120 +0000
Launch Time: 2020-02-20 11:02:28.2698 +0000
OS Version: iPhone OS 13.3 (17C54)
Release Type: User
Baseband Version: 1.03.12
Report Version: 104

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Triggered by Thread: 0

Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x1ae7d6efc 0x1ae7b1000 + 0x25efc
1 libsystem_pthread.dylib 0x1ae6f68b8 0x1ae6f4000 + 0x28b8
2 libsystem_c.dylib 0x1ae686a74 0x1ae610000 + 0x76a74
3 + substitute-inserter.dylib 0x1001ec5e0 0x10012c000 + 0xc05e0
4 dyld 0x1003ef720 0x1003d8000 + 0x17720
5 dyld 0x1003efb08 0x1003d8000 + 0x17b08
6 dyld 0x1003ea460 0x1003d8000 + 0x12460
7 dyld 0x1003e9094 0x1003d8000 + 0x11094
8 dyld 0x1003e9160 0x1003d8000 + 0x11160
9 dyld 0x1003da4a8 0x1003d8000 + 0x24a8
10 dyld 0x1003df038 0x1003d8000 + 0x7038
11 dyld 0x1003d922c 0x1003d8000 + 0x122c
12 dyld 0x1003d9038 0x1003d8000 + 0x1038

Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x0000000125d06930 x5: 0x0000000000000004 x6: 0x0000000000000000 x7: 0x00000000000000c5
x8: 0x00000000000005b9 x9: 0xc3e7685fbc0ecdb9 x10: 0x00000000000f4070 x11: 0x0000000000179f41
x12: 0x0000000125d04000 x13: 0x0000000000003fff x14: 0x00000000b06e373c x15: 0x0000000000002f55
x16: 0x0000000000000148 x17: 0x00000001ece7ef10 x18: 0x0000000000000000 x19: 0x0000000000000006
x20: 0x0000000000000303 x21: 0x0000000100449920 x22: 0x0000000100275000 x23: 0x000000016fd84ae0
x24: 0x000000016fd84ad0 x25: 0x000000016fd85c70 x26: 0x000000016fd84ac0 x27: 0x000000016fd85c60
x28: 0x000000016fd84b00 fp: 0x000000016fd84670 lr: 0x00000001ae6f68b8
sp: 0x000000016fd84650 pc: 0x00000001ae7d6efc cpsr: 0x40000000
esr: 0x56000080 Address size fault

Binary Images (dpkg):
0x100078000 - 0x100103fff + racoon arm64e <63aa00534a8536c4aff487fc0c2bc2b7> /usr/sbin/racoon {"install_date":"2020-02-20 10:48:08 +0000","name":"iPhone Firmware (\/sbin)","identifier":"firmware-sbin","version":"0-1"}
0x10012c000 - 0x10024bfff + substitute-inserter.dylib arm64e <20d28032cf87367389cf25c1d1399c66> /usr/lib/substitute-inserter.dylib {"install_date":"2020-02-20 10:48:04 +0000","name":"Substitute Support Package","identifier":"science.xnu.substituted","version":"0.1~b3"}

Binary Images (App Store):

Binary Images (Other):
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0x1ae5c4000 - 0x1ae5dafff libsystem_trace.dylib arm64e /usr/lib/system/libsystem_trace.dylib
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0x1b0619000 - 0x1b079ffff libsqlite3.dylib arm64e /usr/lib/libsqlite3.dylib
0x1b07a0000 - 0x1b07d2fff MobileKeyBag arm64e <2780973ce05d3566abfa5567d2973d90> /System/Library/PrivateFrameworks/MobileKeyBag.framework/MobileKeyBag
0x1b07d3000 - 0x1b07dcfff libsystem_notify.dylib arm64e <0db1f89f87a33c58b0eda2d0a7520b92> /usr/lib/system/libsystem_notify.dylib
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0x1b1536000 - 0x1b154cfff ProtocolBuffer arm64e /System/Library/PrivateFrameworks/ProtocolBuffer.framework/ProtocolBuffer
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0x1b1568000 - 0x1b1568fff libenergytrace.dylib arm64e <78ff67d76a84315cbcd6571c5e4f770f> /usr/lib/libenergytrace.dylib
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0x1b15a2000 - 0x1b161afff BaseBoard arm64e <8dc55bd22ef637bbb149baf3683341aa> /System/Library/PrivateFrameworks/BaseBoard.framework/BaseBoard
0x1b1c53000 - 0x1b1fb3fff CFNetwork arm64e <7052aa4b1c5b3b58b904ea280e0c8770> /System/Library/Frameworks/CFNetwork.framework/CFNetwork
0x1b31bc000 - 0x1b31cafff AssertionServices arm64e <7eaf805b7d6d34528ce455fff687077b> /System/Library/PrivateFrameworks/AssertionServices.framework/AssertionServices
0x1b31cb000 - 0x1b32a2fff CoreTelephony arm64e <9424072b2cbd3f94855c65a0760a9def> /System/Library/Frameworks/CoreTelephony.framework/CoreTelephony
0x1b32a3000 - 0x1b32a8fff AggregateDictionary arm64e <862910720b1434219b4bdab1c20743fe> /System/Library/PrivateFrameworks/AggregateDictionary.framework/AggregateDictionary
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0x1b4fb7000 - 0x1b4fc0fff libsystem_containermanager.dylib arm64e <3b43b4cbbbff37d5906d4267b3b23e33> /usr/lib/system/libsystem_containermanager.dylib
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0x1b8f86000 - 0x1b90d4fff libFontParser.dylib arm64e <99b7109e0ce73e4692f053347b8e9a59> /System/Library/PrivateFrameworks/FontServices.framework/libFontParser.dylib
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0x1bdb26000 - 0x1bdb27fff liblangid.dylib arm64e <2a827b04feb03b17b4ad3ff7e9c95d19> /usr/lib/liblangid.dylib
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0x1c7a18000 - 0x1c7af2fff libBLAS.dylib arm64e /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libBLAS.dylib
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0x1e424a000 - 0x1e424dfff libutil.dylib arm64e <0b04f33db5e934a78f9a8c1ba55565c0> /usr/lib/libutil.dylib
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0x1e47bd000 - 0x1e47bdfff liblaunch.dylib arm64e <8d8e0d74131d3353a96b2e382bd25d6a> /usr/lib/system/liblaunch.dylib
0x1e47be000 - 0x1e47c3fff libmacho.dylib arm64e /usr/lib/system/libmacho.dylib
0x1e47c4000 - 0x1e47c5fff libremovefile.dylib arm64e <532f053ab81634fa9785432a44ffec51> /usr/lib/system/libremovefile.dylib
0x1e47c6000 - 0x1e47c7fff libsystem_featureflags.dylib arm64e <8da1b6132fec3a1182233b68b5d13a59> /usr/lib/system/libsystem_featureflags.dylib.
0x1e47f6000 - 0x1e47fbfff libunwind.dylib arm64e /usr/lib/system/libunwind.dylib```

[annrein]

I also cannot connect VPN with Unc0ver higher than 4.0.0, in my case it is IPsec.

[mingoo0402]

I had same problem during using L2TP. When I reboot and return to unjailbreaken state, VPN works normlally. Even after updating to Unc0ver ver 4.1.1, the bug still persists.

[YtnbFirewings]

I had same problem during using IPSEC. iPhone XS Max
Unc0ver ver 4.0.3.
I can not jailbreak my device by use new unc0ver version（4.1.1 and above）.

[annrein]

VPN problems still exist in Unc0ver 4.2.1. Do you need crash logs?

[gkmasta]

The VPN issue seems to be resolved for me with unc0ver 4.3.1.
Before I was only able to establish a VPN connection using a third party app, but now my iPhone L2TP VPN profile seems to connect flawlessly. Thanks!