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https://codeberg.org/libreboot/lbmk.git
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Leah Rowe
50695c9fbd
i still use a global variable, but now only one, which is a structure containing the state of the entire program now i can easily start modifying it to make functions generic, and then i can start making parts of it into easy libraries Signed-off-by: Leah Rowe <leah@libreboot.org>
135 lines
4.4 KiB
C
135 lines
4.4 KiB
C
/* SPDX-License-Identifier: MIT
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*
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* Copyright (c) 2026 Leah Rowe <leah@libreboot.org>
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*
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* Five Year Plan
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*/
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/*
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* Major TODO: split this into multiple files.
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* This program has become quite large now, mostly
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* due to all the extra sanity checks / portability.
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* Make most of nvmutil a *library* for re-use
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*
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* TODO: gettimeofday not posible - use portable functions.
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* TODO: ux fallback: modify the program instead
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* to run on 16-bit systems: smaller buffers, and do
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* operations byte-based instead of word-based.
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*
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* TODO: _XOPEN_SOURCE 500 probably not needed anymore.
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* the portable fallbacks alone are likely enough.
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* e.g. i don't need stdint, and i don't use pwrite/pread
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* anymore.
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*
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* TODO: version detection of various BSDs to detect
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* arc4random, use that if available. but also work on
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* older versions of those BSDs (also MacOS) that lack it.
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*
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* TODO: portability/testing on non-Unix systems:
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* old DOS. all windows versions (probably irrelevant
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* because you can use cygwin/wsl, whatever), classic MacOS,
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* also test really old unix e.g. sunos and irix. Be/Haiku too!
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*
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* TODO: reliance on global variables for status. make
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* functions use structs passed as args instead, make
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* functions re-useable (including libraries), etc.
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*
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* TODO: bound checks for files per-command, e.g. only
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* first 6 bytes for CMD_SETMAC
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*
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* TODO: in command sanitizer: verify that each given
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* entry corresponds to the correct function, in the
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* pointer (this check is currently missing)
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*
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* TODO: general modularisierung of the entire codebase.
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* TODO: better explain copy/swap read inversion trick
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* by improving existing comments
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* TODO: lots of overwritten comments in code. tidy it up.
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*
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* TODO: use getopt for nvmutil args, so that multiple
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* operations can be performed, and also on many
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* files at once (noting limitations with cat)
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* BONUS: implement own getopt(), for portability
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*
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* TODO: document fuzzing / analysis methods
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* for the code, and:
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* TODO: implement rigorous unit tests (separate util)
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* NOTE: this would *include* known good test files
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* in various configurations, also invalid files.
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* the tests would likely be portable posix shell
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* scripts rather than a new C program, but a modularisiert
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* codebase would allow me to write a separate C
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* program to test some finer intricacies
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* TODO: the unit tests would basically test regressions
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* TODO: after writing back a gbe to file, x_i_close() and
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* open() it again, read it again, and check that
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* the contents were written correctly, providing
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* a warning if they were. do this in the main
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* program.
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* TODO: the unit tests would include an aggressive set
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* of fuzz tests, under controlled conditions
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*
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* TODO: also document the layout of Intel GbE files, so
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* that wily individuals can easily expand the
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* featureset of nvmutil.
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* TODO: write a manpage
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* TODO: simplify the command sanitization, implement more
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* of it as build time checks, e.g. asserts.
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* generally remove cleverness from the code, instead
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* prefyerring readibility
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* TODO: also document nvmutil's coding style, which is
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* its own style at this point!
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* TODO: when all the above (and possibly more) is done,
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* submit this tool to coreboot with a further change
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* to their build system that lets users modify
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* GbE images, especially set MAC addresses, when
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* including GbE files in coreboot configs.
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*/
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/*
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BONUS TODO:
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CI/CD. woodpecker is good enough, sourcehut also has one.
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tie this in with other things mentioned here,
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e.g. fuzzer / unit tests
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*/
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/* Major TODO: reproducible builds
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Test with and without these:
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CFLAGS += -fno-record-gcc-switches
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CFLAGS += -ffile-prefix-map=$(PWD)=.
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CFLAGS += -fdebug-prefix-map=$(PWD)=.
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I already avoid unique timestamps per-build,
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by not using them, e.g. not reporting build
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time in the program.
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When splitting the nvmutil.c file later, do e.g.:
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SRC = main.c io.c nvm.c cmd.c
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OBJ = $(SRC:.c=.o)
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^ explicitly declare the order in which to build
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*/
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/*
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TODO:
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further note when fuzzing is implemented:
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use deterministic randomisation, with a
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guaranteed seed - so e.g. don't use /dev/urandom
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in test builds. e.g. just use normal rand()
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but with a seed e.g. 1234
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*/
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/*
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TODO: stricter build flags, e.g.
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CFLAGS += -fstack-protector-strong
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CFLAGS += -fno-common
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CFLAGS += -D_FORTIFY_SOURCE=2
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CFLAGS += -fPIE
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also consider:
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-fstack-clash-protection
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-Wl,-z,relro
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-Wl,-z,now
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*/
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