This is a simple wrapper that hooks calls to getenv or secure_getenv and replaces the value of the environment variable specified in argv[1] with data from stdin.
clang -ggdb -O2 tests/env.c -o tests/env
cargo build
LD_PRELOAD=./target/debug/libets.so ./tests/env ZSH <<< $(head /dev/urandom)Note: The changed environment variable only persist in the context of the run application.