debian-random.so.c

// gcc -shared -fPIC -Wall -Werror -o debian-random.so debian-random.so.c

#define _GNU_SOURCE
#include <dlfcn.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>

int null_fd = -1;
int (*real_open)(const char *pathname, int flags, mode_t mode) = NULL;
int (*real_close)(int fd) = NULL;

double drand48(void)
{
	return .0;
}

double erand48(unsigned short xsubi[3])
{
	return .0;
}

long int lrand48(void)
{
	return 0;
}

long int nrand48(unsigned short xsubi[3])
{
	return 0;
}

long int mrand48(void)
{
	return 0;
}

long int jrand48(unsigned short xsubi[3])
{
	return 0;
}

int random_r(struct random_data *buf, int32_t *result)
{
	*result = 0;
	return 0;
}

long int random()
{
	return 0;
}

int rand()
{
	return 0;
}

int rand_r(unsigned int *seedp)
{
	return 0;
}

int close(int fd)
{
	if (real_close == NULL)
		real_close = dlsym(RTLD_NEXT, "close");

	if (fd == null_fd)
		return 0;

	return real_close(fd);
}

int open(const char *pathname, int flags, mode_t mode)
{
	if (real_open == NULL)
		real_open = dlsym(RTLD_NEXT, "open");

	if (strcmp(pathname, "/dev/random") == 0 ||
			strcmp(pathname, "/dev/urandom") == 0)
	{
		if (null_fd == -1)
			null_fd = real_open("/dev/zero", 2, 0);

		return null_fd;
	}

	return real_open(pathname, flags, mode);
}