80486DX2-66/C-bytebeat-render
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b/c...py: secure input and output files

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Do not use environmental variables `INPUT_FILE` and `OUTPUT_FILE`
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Intel A80486DX2-66 2024-08-26 22:44:58 +03:00
parent f70ef4c74d
commit 974f7eb53b
Signed by: 80486DX2-66
GPG Key ID: 83631EF27054609B
1 changed files with 9 additions and 13 deletions
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22
bytebeat_compiler.py
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@ -5,7 +5,7 @@ if __name__ == "__main__":
from argparse import ArgumentParser from argparse import ArgumentParser
from os import environ, makedirs, name as os_name, rename from os import environ, makedirs, name as os_name, rename
from os.path import basename, exists, join as path_join from os.path import exists, join as path_join
from shlex import join as command_line_join, split as command_line_split from shlex import join as command_line_join, split as command_line_split
from shutil import which from shutil import which
from sys import stdin, stdout from sys import stdin, stdout
@ -46,9 +46,7 @@ DEFAULT_PARAMETERS = {
"CC": "cc", "CC": "cc",
"CFLAGS": "-Ofast -march=native -mtune=native -Wall -Wextra -Wpedantic " "CFLAGS": "-Ofast -march=native -mtune=native -Wall -Wextra -Wpedantic "
"-pedantic -Wno-unused-variable -Wno-unused-but-set-variable " "-pedantic -Wno-unused-variable -Wno-unused-but-set-variable "
"-Wno-dangling-else -Wno-parentheses -std=c99", "-Wno-dangling-else -Wno-parentheses -std=c99"
"INPUT_FILE": PATHS["substitute_kept"],
"OUTPUT_FILE": PATHS["output_kept"]
} }
stdout_atty = hasattr(stdout, "isatty") and stdout.isatty() stdout_atty = hasattr(stdout, "isatty") and stdout.isatty()
@ -111,8 +109,6 @@ if os_name == "nt":
] ]
CFLAGS = fetch("CFLAGS") CFLAGS = fetch("CFLAGS")
INPUT_FILE = fetch("INPUT_FILE")
OUTPUT_FILE = fetch("OUTPUT_FILE")
if extra := fetch("CFLAGS_EXTRA"): if extra := fetch("CFLAGS_EXTRA"):
CFLAGS += " " + extra CFLAGS += " " + extra
@ -123,8 +119,8 @@ if __name__ == "__main__":
parser = ArgumentParser(description=\ parser = ArgumentParser(description=\
"Substitutes supplied C (non-JavaScript!) bytebeat into the template, " "Substitutes supplied C (non-JavaScript!) bytebeat into the template, "
"then attempts to compile the instance of the template. Accepts " "then attempts to compile the instance of the template. Accepts "
"environmental variables `CC`, `CFLAGS`, `INPUT_FILE`, `OUTPUT_FILE`. " "environmental variables `CC`, `CFLAGS`. `CFLAGS_EXTRA` can be used to "
"`CFLAGS_EXTRA` can be used to add to default `CFLAGS`.") "add to default `CFLAGS`.")
parser.add_argument("file", type=str, parser.add_argument("file", type=str,
help="bytebeat formula file (use `-` to read from stdin)") help="bytebeat formula file (use `-` to read from stdin)")
parser.add_argument("-o", "--output", default="output.wav", type=str, parser.add_argument("-o", "--output", default="output.wav", type=str,
@ -257,9 +253,9 @@ if __name__ == "__main__":
"CC.") "CC.")
with TemporaryDirectory() as tmpdirname: with TemporaryDirectory() as tmpdirname:
temporary_path = lambda path: path_join(tmpdirname, basename(path)) temporary_path = lambda path: path_join(tmpdirname, path)
substitute_temp = temporary_path(INPUT_FILE) substitute_temp = temporary_path(PATHS["substitute"])
rewrite_file(substitute_temp, substitute_vars({ rewrite_file(substitute_temp, substitute_vars({
"bytebeat_contents": bytebeat_contents, "bytebeat_contents": bytebeat_contents,
"output_file": C_str_repr(args.output), "output_file": C_str_repr(args.output),
@ -288,7 +284,7 @@ if __name__ == "__main__":
# Compile # Compile
print("Compiling") print("Compiling")
output_file_temp = temporary_path(OUTPUT_FILE) output_file_temp = temporary_path(PATHS["output"])
run_command( run_command(
CC, CC,
@ -303,5 +299,5 @@ if __name__ == "__main__":
if args.keep_files: if args.keep_files:
makedirs(PATHS["bin_dir"], exist_ok=True) makedirs(PATHS["bin_dir"], exist_ok=True)
rename(substitute_temp, INPUT_FILE) rename(substitute_temp, PATHS["substitute_kept"])
rename(output_file_temp, OUTPUT_FILE) rename(output_file_temp, PATHS["output_kept"])