#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main(int argc, char *argv[], char *envp[])
{
	char **new_envp;
	int i, j, n;

	for (n = 0; envp[n]; n++) {
		/* Just counting the environment variables. */
	}

	new_envp = malloc(n * sizeof (*new_envp));
	if (!new_envp) {
		/* Can't allocate the new environment. */
		exit(1);
	}

	for (i = j = 0; envp[i]; i++) {
		char const *equals;

		if ((equals = strchr(envp[i], '=')) && strncmp(equals + 1, "() {", 4) == 0) {
			/* Attempted function import - don't add it. */
		} else {
			new_envp[j++] = envp[i];
		}
	}

	execve("/bin/bash.real", argv, new_envp);
	exit(1);
}