mirror of https://github.com/CPunch/Laika.git
56 lines
3.7 KiB
Markdown
56 lines
3.7 KiB
Markdown
# CONTRIBUTING to Laika
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HEAD: https://github.com/CPunch/Laika/tree/main
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## Directories explained
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- `/cmake-modules` holds helper functions for CMake.
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- `/lib` is a shared static library between the bot, shell & CNC. LibSodium is also vendor'd here.
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- `/cnc` is the Command aNd Control server. (Currently only targets Linux)
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- `/bot` is the bot client to be ran on the target machine. (Targets both Linux and Windows)
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- `/shell` is the main shell to connect to the CNC server with to issue commands. (Currently only targets Linux)
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- `/tools` holds tools for generating keypairs, etc.
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## Coding style
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Laika uses clang-format to enforce a consistent style across the codebase. Before committing changes, make sure to run `git clang-format` and add the changes to the commit. Pull requests with wrong styling will be rejected.
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## Tasks and TODOs
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Looking for some simple tasks that need to get done for that sweet 'contributor' cred? Check here!
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- Change `lib/lin/linshell.c` to use openpty() instead of forkpty() for BSD support
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- Fix address sanitizer for CMake DEBUG builds
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- Change laikaT_getTime in `lib/src/ltask.c` to not use C11 features
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- Implement more LAIKA_BOX_* VMs in `lib/include/lbox.h`
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## Lib: Error Handling
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Error handling in Laika is done via the 'lerror.h' header library. It's a small and simple error handling solution written for laika, however can be stripped and used as a simple error handling library. Error handling in Laika is used similarly to other languages, implementing a try & catch block and is achieved using setjmp(). The LAIKA_ERROR(...) is used to throw errors.
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Example:
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```C
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LAIKA_TRY
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printf("Ran first\n");
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LAIKA_ERROR("Debug message here\n");
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printf("You'll never see this\n");
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LAIKA_CATCH
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printf("Ran second!\n");
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LAIKA_TRYEND
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printf("Ran last!\n");
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```
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Some minor inconveniences include:
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- `return` or other control-flow statements that leave the current scope cannot be used in the LAIKA_TRY or LAIKA_CATCH scopes.
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- max of 32 depth, avoid using recursively.
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- not thread safe.
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## Lib: Packet Handlers
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Laika has a simple binary protocol & a small backend (see `lib/src/lpeer.c`) to handle packets to/from peers. `lib/include/lpacket.h` includes descriptions for each packet type. For an example of proper packet handler definitions see `bot/src/bot.c`. It boils down to passing a sLaika_peerPacketInfo table to laikaS_newPeer. To add packet handlers to the bot, add your handler info to laikaB_pktTbl in `bot/src/bot.c`. To add packet handlers to the shell, add your handler info to shellC_pktTbl in `shell/src/sclient.c`. For adding packet handlers to cnc, make sure you add them to the corresponding table in `cnc/src/cnc.c`, laikaC_botPktTbl for packets being received from a bot peer, laikaC_authPktTbl for packets being received from an auth peer (shell), or DEFAULT_PKT_TBL if it's received by all peer types (things like handshakes, keep-alive, etc.)
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## Lib: Task Service
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Tasks can be scheduled on a delta-period (call X function every approximate N seconds). laikaT_pollTasks() is used to check & run any currently queued tasks. This is useful for sending keep-alive packets, polling shell pipes, or other repeatably scheduled tasks. Most laikaT_pollTasks() calls are done in the peerHandler for each client/server.
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## Lib: VM Boxes
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Laika has a tiny VM for decrypting sensitive information. For details on the ISA read `lib/include/lvm.h`, for information on how to use them read `lib/include/lbox.h`. Feel free to write your own boxes and contribute them :D
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## Bot: Platform-specific backends
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`bot/win` and `bot/lin` include code for platform-specific code that can't be quickly "ifdef"d away. These mainly include stuff like persistence or opening pseudo-ttys. |