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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd



%%	header

/**	@file	dk4rnd.h	Random number generation.

NOT A GOOD IDEA: WE EITHER NEED CRYPTOGRAPHICALLY STRONG RANDOM DATA
OR LIGHTWEIGHT RANDOM DATA FOR GAMES OR SIMULATIONS.
ONE SIZE DOESN'T FIT ALL!
*/


#ifdef __cplusplus
extern "C" {
#endif

/**	Retrieve PRNG type.
	@return	PRNG type.
*/
int
dk4rnd_get_prng_type(void);

/**	Initialize (seed) PRNG.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.

	Error codes:
	- DK4_E_NOT_FOUND<br>
	  if the function failed to obtain seed data.
*/
int
dk4rnd_init(dk4_er_t *erp);

/**	Retrieve random bytes.
	@param	bptr	Pointer to destination buffer.
	@param	bs	Destination buffer size.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if bptr is NULL or bs is either 0 or too large,
	- DK4_E_SYNTAX<br>
	  if the PRNG was not yet initialized successfully,
	- DK4_E_NOT_FOUND<br>
	  if the function failed to obtain random data.
*/
int
dk4rnd_get_data(void *bptr, size_t bs, dk4_er_t *erp);

/**	Clean up PRNG.
*/
void
dk4rnd_cleanup(void);

#ifdef __cplusplus
}
#endif

/**	Random number generators.
*/
enum {
			/**	Use rand() function.
			*/
  DK4_PRNG_SIMPLE	=	1,

			/**	Use nrand48() function.
			*/
  DK4_PRNG_RAND48	=	2,

			/**	Use initstate()/setstate() functions.
			*/
  DK4_PRNG_STATE	=	4,

			/**	Use OpenSSL PRNG.
			*/
  DK4_PRNG_OPENSSL	=	8,

			/**	All the PRNGs above.
			*/
  DK4_PRNG_ALL		=	(
  					DK4_PRNG_SIMPLE
					| DK4_PRNG_RAND48
					| DK4_PRNG_STATE
					| DK4_PRNG_OPENSSL
  				)

};

%%	module

#include "dk4conf.h"

#include <stdio.h>

#if DK4_HAVE_STDLIB_H
#ifndef STDLIB_H_INCLUDED
#include <stdlib.h>
#endif
#endif

#if DK4_HAVE_SYS_TYPES_H
#ifndef SYS_TYPES_H_INCLUDED
#include <sys/types.h>
#define	SYS_TYPES_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_OPENSSL_RAND_H
#ifndef OPENSSL_RAND_H_INCLUDED
#include <openssl/rand.h>
#define	OPENSSL_RAND_H_INCLUDED	1
#endif
#endif

#include "dk4rnd.h"



$!trace-include



static const int dk4rnd_used_type =
#if DK4_HAVE_OPENSSL_RAND_H
  DK4_PRNG_OPENSSL
#else
#if DK4_HAVE_RANDOM
  DK4_PRNG_STATE
#else
#if DK4_HAVE_LRAND48
  DK4_PRNG_RAND48
#else
#if DK4_HAVE_RAND
  DK4_PRNG_SIMPLE
#else
  0
#endif
#endif
#endif
#endif
;



/**	Static keywords used by the module, not localized.
*/
static const char * const	dk4rnd_kwnl[] = {
$!string-table
#
#	0	Environment variable name, pointing to EGD socket
#
EGDSOCKET
#
#	1	The /dev/random device
#
/dev/random
#
#	2	The /dev/urandom device
#
/dev/urandom
$!end
};



/**	Flag: Already seeded.
*/
static int dk4rnd_seeded	=	0;



#if !DK4_HAVE_OPENSSL_RAND_H
#if DK4_HAVE_RANDOM || DK4_HAVE_LRAND48 || DK4_HAVE_RAND

/**	Attempt to obtain seed data.
	@param	bptr	Buffer pointer.
	@param	sz	Buffer size.
	@return	1 on success, 0 on error.

*/
static
int
dk4rnd_find_seed_data(void *bptr, size_t sz)
{
#if DK4_ON_WINDOWS
  HCRYPTPROV		 hcp;			/* Crypto provider */
  BOOL			 res;			/* Operation result */
#else
#if DK4_HAVE_SOCKET
  struct sockaddr_un	 soun;			/* Unix domain socket addr */
  socklen_t		 szs;			/* Socket length */
  ssize_t		 sobytes;		/* Bytes obtained */
  int			 udsock;		/* Unix domain socket */
#endif
  char			*egdsn	=	NULL;
#endif
  FILE			*fipo;
  size_t		 rdb;
  int			 back = 0;

  /*	EGD socket
  */
#if !DK4_ON_WINDOWS
  egdsn = getenv(dk4rnd_kwnl[0]);
  if (NULL != egdsn) {
    if (108 > strlen(egdsn)) {
      udsock = socket(AF_UNIX, SOCK_STREAM, 0);
      if (-1 < udsock) {
        soun.sun_family = AF_UNIX;
	strcpy(soun.sun_path, egdsn);
	szs = sizeof(struct sockaddr_un) - sizeof(soun.sun_path)
	      + strlen(soun.sun_path);
	if (0 == connect(udsock, (const struct sockaddr *)(&soun), szs)) {
	  sobytes = recv(udsock, bptr, sz, 0);
	  if (0 < sobytes) {
	    if ((size_t)sobytes == sz) {
	      back = 1;
	    }
	  } else {				$? "! recv"
	  }
	} else {				$? "! connect"
	}
        close(udsock);
      } else {					$? "! socket"
      }
    } else {					$? "! name too long"
    }
  } else {					$? "! not env var"
  }
  if (1 == back) { goto finished; }
#endif

  /*	System mechanisms.
  */
#if DK4_ON_WINDOWS
  res = CryptAcquireContext(
    &hcp, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT
  );
  if (res) {
    res = CryptGenRandom(hcp, (DWORD)sz, bptr);
    if (res) {
      back = 1;
    }
    CryptReleaseContext(hcp, (DWORD)0L);
  }
#else
  fipo = fopen(dk4rnd_kwnl[1], "rb");
  if (NULL != fipo) {
    rdb = fread(bptr, 1, sz, fipo);
    fclose(fipo);
    if ((0 < rdb) && (sz == rdb)) {
      back = 1;
    }
  } else {
    fipo = fopen(dk4rnd_kwnl[2], "rb");
    if (NULL != fipo) {
      rdb = fread(bptr, 1, sz, fipo);
      fclose(fipo);
      if ((0 < rdb) && (sz == rdb)) {
        back = 1;
      }
    }
  }
#endif
  finished:
  return back;
}

#endif
#endif


#if DK4_HAVE_OPENSSL_RAND_H
  /* +++++ OpenSSL available */

int
dk4rnd_init(dk4_er_t *erp)
{
  char		 sbuf[256];		/* Buffer for seed data */
#if DK4_ON_WINDOWS
  HCRYPTPROV	 hcp;
#endif
  FILE		*fipo	=	NULL;	/* Input file */
  size_t	 rdb	=	0;	/* Number of bytes read */
  char		*egdsn	=	NULL;	/* EGD socket name */
  int		 back	=	0;
#if DK4_ON_WINDOWS
  BOOL		 res	=	FALSE;
#endif

  /*	Let OpenSSL initialize itself.
  */
  if (1 == RAND_status()) {
    back = 1; goto finished;
  }

  /*	Attempt EGD socket.
  */
#if	DK4_HAVE_RAND_EGD && DK4_HAVE_STRUCT_SOCKADDR_UN
  egdsn = getenv(dk4rnd_kwnl[0]);
  if (NULL != egdsn) {
    RAND_egd(egdsn);
    if (1 == RAND_status()) {
      back = 1; goto finished;
    }
  }
#endif

  /*	Attempt native mechanisms.
  */
#if DK4_ON_WINDOWS
  res = CryptAcquireContext(
    &hcp, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT
  );
  if (res) {
    res = CryptGenRandom(hcp, (DWORD)sizeof(sbuf), sbuf);
    if (res) {
      RAND_seed(sbuf, sizeof(sbuf));
      if (1 == RAND_status()) {
        back = 1;
      }
    }
    CryptReleaseContext(hcp, (DWORD)0L);
  }
  if (1 == back) { goto finished; }
#else
  fipo = fopen(dk4rnd_kwnl[1], "rb");
  if (NULL != fipo) {
    rdb = fread(sbuf, 1, sizeof(sbuf), fipo);
    fclose(fipo);
    if (rdb > 0) {
      RAND_seed(sbuf, rdb);
      if (1 == RAND_status()) {
        back = 1; goto finished;
      }
    }
  } else {
    fipo = fopen(dk4rnd_kwnl[2], "rb");
    if (NULL != fipo) {
      rdb = fread(sbuf, 1, sizeof(sbuf), fipo);
      fclose(fipo);
      if (rdb > 0) {
        RAND_seed(sbuf, rdb);
	if (1 == RAND_status()) {
	  back = 1; goto finished;
	}
      }
    }
  }
#endif
  dk4error_set_simple_error_code(erp, DK4_E_NOT_FOUND);
finished:
  if (1 == back) {
    dk4rnd_seeded = 1;
  }
  return back;
}

int
dk4rnd_get_data(void *bptr, size_t bs, dk4_er_t *erp)
{
  int		 back = 0;
  if ((NULL != bptr) && (0 < bs)) {
    if ((dk4_um_t)bs <= (dk4_um_t)INT_MAX) {
      if (0 != dk4rnd_seeded) {
        back = RAND_bytes(bptr, (int)bs);
        if (1 > back) {
          dk4error_set_simple_error_code(erp, DK4_E_NOT_FOUND);
        }
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
      }
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}

void
dk4rnd_cleanup(void)
{
  RAND_cleanup();
  dk4rnd_seeded = 0;
}

  /* ----- OpenSSL available */
#else
#if DK4_HAVE_RANDOM
  /* +++++ initstate(), setstate() and random() available */

/**	State array.
*/
static char	dk4rnd_random_state[256];

/**	The initial state array.
*/
static char	*dk4rnd_old_state	=	NULL;

int
dk4rnd_init(dk4_er_t *erp)
{
  unsigned int	 sv;		/* Seed value */
  int		 back = 0;

  if (0 != dk4rnd_find_seed_data(&sv, sizeof(sv))) {
    DK4_MEMRES(dk4rnd_random_state, sizeof(dk4rnd_random_state));
    if (NULL == dk4rnd_old_state) {
      dk4rnd_old_state = initstate(sv, dk4rnd_random_state, 256);
    } else {
      (void)initstate(sv, dk4rnd_random_state, 256);
    }
    back = 1;
  }
  if (1 == back) { dk4rnd_seeded = 1; }
  return back;
}

int
dk4rnd_get_data(void *bptr, size_t bs, dk4_er_t *erp)
{
  int		 back = 0;
  if ((NULL != bptr) && (0 < bs)) {
    if (0 != dk4rnd_seeded) {
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}

void
dk4rnd_cleanup(void)
{
}

  /* ----- initstate(), setstate() and random() available */
#else
#if DK4_HAVE_LRAND48
  /* +++++ lrand48(), nrand48() and seed48() available */

int
dk4rnd_init(dk4_er_t *erp)
{
  int		 back = 0;
finished:
  if (1 == back) { dk4rnd_seeded = 1; }
  return back;
}

int
dk4rnd_get_data(void *bptr, size_t bs, dk4_er_t *erp)
{
  int		 back = 0;
  if ((NULL != bptr) && (0 < bs)) {
    if (0 != dk4rnd_seeded) {
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}

void
dk4rnd_cleanup(void)
{
}

  /* ----- lrand48(), nrand48() and seed48() available */
#else
#if DK4_HAVE_RAND
  /* +++++ rand() and srand() available */

int
dk4rnd_init(dk4_er_t *erp)
{
  int		 back = 0;

finished:
  if (1 == back) { dk4rnd_seeded = 1; }
  return back;
}

int
dk4rnd_get_data(void *bptr, size_t bs, dk4_er_t *erp)
{
  int		 back = 0;
  if ((NULL != bptr) && (0 < bs)) {
    if (0 != dk4rnd_seeded) {
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}

void
dk4rnd_cleanup(void)
{
}

  /* ----- rand() and srand() available */
#else
  /* +++++ no PRNG available */

int
dk4rnd_init(dk4_er_t *erp)
{
  int		 back = 0;
  return back;
}

int
dk4rnd_get_data(void *bptr, size_t bs, dk4_er_t *erp)
{
  int		 back = 0;
  if ((NULL != bptr) && (0 < bs)) {
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}

void
dk4rnd_cleanup(void)
{
}

  /* ----- no PRNG available */
#endif
#endif
#endif
#endif

int
dk4rnd_get_prng_type(void)
{
  return dk4rnd_used_type;
}