

#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include "internal/e_os.h"
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/rand.h>
#include <openssl/crypto.h>
#include "crypto/rand_pool.h"
#include "crypto/rand.h"
#include "internal/dso.h"
#include "internal/nelem.h"
#include "prov/seeding.h"

#ifdef __linux
# include <sys/syscall.h>
# ifdef DEVRANDOM_WAIT
#  include <sys/shm.h>
#  include <sys/utsname.h>
# endif
#endif
#if (defined(__FreeBSD__) || defined(__NetBSD__)) && !defined(OPENSSL_SYS_UEFI)
# include <sys/types.h>
# include <sys/sysctl.h>
# include <sys/param.h>
#endif
#if defined(__OpenBSD__)
# include <sys/param.h>
#endif
#if defined(__DragonFly__)
# include <sys/param.h>
# include <sys/random.h>
#endif

#if (defined(OPENSSL_SYS_UNIX) && !defined(OPENSSL_SYS_VXWORKS)) \
     || defined(__DJGPP__)
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
# include <unistd.h>
# include <sys/time.h>

static uint64_t get_time_stamp(void);


# define TWO32TO64(a, b) ((((uint64_t)(a)) << 32) + (b))


# undef OSSL_POSIX_TIMER_OKAY

# if defined(_POSIX_TIMERS) && _POSIX_TIMERS -0 > 0
#  if defined(__GLIBC__)
#   if defined(__GLIBC_PREREQ)
#    if __GLIBC_PREREQ(2, 17)
#     define OSSL_POSIX_TIMER_OKAY
#    endif
#   endif
#  else
#   define OSSL_POSIX_TIMER_OKAY
#  endif
# endif
#endif 

#if defined(OPENSSL_RAND_SEED_NONE)

# undef OPENSSL_RAND_SEED_OS
# undef OPENSSL_RAND_SEED_GETRANDOM
# undef OPENSSL_RAND_SEED_LIBRANDOM
# undef OPENSSL_RAND_SEED_DEVRANDOM
# undef OPENSSL_RAND_SEED_RDTSC
# undef OPENSSL_RAND_SEED_RDCPU
# undef OPENSSL_RAND_SEED_EGD
#endif

#if defined(OPENSSL_SYS_UEFI) && !defined(OPENSSL_RAND_SEED_NONE)
# error "UEFI only supports seeding NONE"
#endif

#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) \
    || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_VXWORKS) \
    || defined(OPENSSL_SYS_UEFI))

# if defined(OPENSSL_SYS_VOS)

#  ifndef OPENSSL_RAND_SEED_OS
#   error "Unsupported seeding method configured; must be os"
#  endif

#  if defined(OPENSSL_SYS_VOS_HPPA) && defined(OPENSSL_SYS_VOS_IA32)
#   error "Unsupported HP-PA and IA32 at the same time."
#  endif
#  if !defined(OPENSSL_SYS_VOS_HPPA) && !defined(OPENSSL_SYS_VOS_IA32)
#   error "Must have one of HP-PA or IA32"
#  endif


size_t ossl_pool_acquire_entropy(RAND_POOL *pool)
{
    short int code;
    int i, k;
    size_t bytes_needed;
    struct timespec ts;
    unsigned char v;
#  ifdef OPENSSL_SYS_VOS_HPPA
    long duration;
    extern void s$sleep(long *_duration, short int *_code);
#  else
    long long duration;
    extern void s$sleep2(long long *_duration, short int *_code);
#  endif

    bytes_needed = ossl_rand_pool_bytes_needed(pool, 4 );

    for (i = 0; i < bytes_needed; i++) {
        
        for (k = 0; k < 99; k++)
            ts.tv_nsec = random();

#  ifdef OPENSSL_SYS_VOS_HPPA
        
        duration = 1;
        s$sleep(&duration, &code);
#  else
        
        duration = 1;
        s$sleep2(&duration, &code);
#  endif

        
        clock_gettime(CLOCK_REALTIME, &ts);
        v = (unsigned char)(ts.tv_nsec & 0xFF);
        ossl_rand_pool_add(pool, arg, &v, sizeof(v), 2);
    }
    return ossl_rand_pool_entropy_available(pool);
}

void ossl_rand_pool_cleanup(void)
{
}

void ossl_rand_pool_keep_random_devices_open(int keep)
{
}

# else

#  if defined(OPENSSL_RAND_SEED_EGD) && \
        (defined(OPENSSL_NO_EGD) || !defined(DEVRANDOM_EGD))
#   error "Seeding uses EGD but EGD is turned off or no device given"
#  endif

#  if defined(OPENSSL_RAND_SEED_DEVRANDOM) && !defined(DEVRANDOM)
#   error "Seeding uses urandom but DEVRANDOM is not configured"
#  endif

#  if defined(OPENSSL_RAND_SEED_OS)
#   if !defined(DEVRANDOM)
#    error "OS seeding requires DEVRANDOM to be configured"
#   endif
#   define OPENSSL_RAND_SEED_GETRANDOM
#   define OPENSSL_RAND_SEED_DEVRANDOM
#  endif

#  if defined(OPENSSL_RAND_SEED_LIBRANDOM)
#   error "librandom not (yet) supported"
#  endif

#  if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(KERN_ARND)

static ssize_t sysctl_random(char *buf, size_t buflen)
{
    int mib[2];
    size_t done = 0;
    size_t len;

    

    
#if   defined(__FreeBSD__)
    if (!ossl_assert(buflen % sizeof(long) == 0)) {
        errno = EINVAL;
        return -1;
    }
#endif

    
#if   defined(__NetBSD__) && __NetBSD_Version__ < 400000000
    errno = ENOSYS;
    return -1;
#endif

    mib[0] = CTL_KERN;
    mib[1] = KERN_ARND;

    do {
        len = buflen > 256 ? 256 : buflen;
        if (sysctl(mib, 2, buf, &len, NULL, 0) == -1)
            return done > 0 ? done : -1;
        done += len;
        buf += len;
        buflen -= len;
    } while (buflen > 0);

    return done;
}
#  endif

#  if defined(OPENSSL_RAND_SEED_GETRANDOM)

#   if defined(__linux) && !defined(__NR_getrandom)
#    if defined(__arm__)
#     define __NR_getrandom    (__NR_SYSCALL_BASE+384)
#    elif defined(__i386__)
#     define __NR_getrandom    355
#    elif defined(__x86_64__)
#     if defined(__ILP32__)
#      define __NR_getrandom   (__X32_SYSCALL_BIT + 318)
#     else
#      define __NR_getrandom   318
#     endif
#    elif defined(__xtensa__)
#     define __NR_getrandom    338
#    elif defined(__s390__) || defined(__s390x__)
#     define __NR_getrandom    349
#    elif defined(__bfin__)
#     define __NR_getrandom    389
#    elif defined(__powerpc__)
#     define __NR_getrandom    359
#    elif defined(__mips__) || defined(__mips64)
#     if _MIPS_SIM == _MIPS_SIM_ABI32
#      define __NR_getrandom   (__NR_Linux + 353)
#     elif _MIPS_SIM == _MIPS_SIM_ABI64
#      define __NR_getrandom   (__NR_Linux + 313)
#     elif _MIPS_SIM == _MIPS_SIM_NABI32
#      define __NR_getrandom   (__NR_Linux + 317)
#     endif
#    elif defined(__hppa__)
#     define __NR_getrandom    (__NR_Linux + 339)
#    elif defined(__sparc__)
#     define __NR_getrandom    347
#    elif defined(__ia64__)
#     define __NR_getrandom    1339
#    elif defined(__alpha__)
#     define __NR_getrandom    511
#    elif defined(__sh__)
#     if defined(__SH5__)
#      define __NR_getrandom   373
#     else
#      define __NR_getrandom   384
#     endif
#    elif defined(__avr32__)
#     define __NR_getrandom    317
#    elif defined(__microblaze__)
#     define __NR_getrandom    385
#    elif defined(__m68k__)
#     define __NR_getrandom    352
#    elif defined(__cris__)
#     define __NR_getrandom    356
#    else 
#     define __NR_getrandom    278
#    endif
#   endif


static ssize_t syscall_random(void *buf, size_t buflen)
{
    

    
#  if !defined(__DragonFly__) && !defined(__NetBSD__)
#    if defined(__GNUC__) && __GNUC__>=2 && defined(__ELF__) && !defined(__hpux)
    extern int getentropy(void *buffer, size_t length) __attribute__((weak));

    if (getentropy != NULL) {
        if (getentropy(buf, buflen) == 0)
            return (ssize_t)buflen;
        if (errno != ENOSYS)
            return -1;
    }
#    elif defined(OPENSSL_APPLE_CRYPTO_RANDOM)

    if (CCRandomGenerateBytes(buf, buflen) == kCCSuccess)
	    return (ssize_t)buflen;

    return -1;
#    else
    union {
        void *p;
        int (*f)(void *buffer, size_t length);
    } p_getentropy;

    
    ERR_set_mark();
    p_getentropy.p = DSO_global_lookup("getentropy");
    ERR_pop_to_mark();
    if (p_getentropy.p != NULL)
        return p_getentropy.f(buf, buflen) == 0 ? (ssize_t)buflen : -1;
#    endif
#  endif 

    
#  if defined(__linux) && defined(__NR_getrandom)
    return syscall(__NR_getrandom, buf, buflen, 0);
#  elif (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(KERN_ARND)
    return sysctl_random(buf, buflen);
#  elif (defined(__DragonFly__)  && __DragonFly_version >= 500700) \
     || (defined(__NetBSD__) && __NetBSD_Version >= 1000000000)
    return getrandom(buf, buflen, 0);
#  elif defined(__wasi__)
    if (getentropy(buf, buflen) == 0)
      return (ssize_t)buflen;
    return -1;
#  else
    errno = ENOSYS;
    return -1;
#  endif
}
#  endif    

#  if defined(OPENSSL_RAND_SEED_DEVRANDOM)
static const char *random_device_paths[] = { DEVRANDOM };
static struct random_device {
    int fd;
    dev_t dev;
    ino_t ino;
    mode_t mode;
    dev_t rdev;
} random_devices[OSSL_NELEM(random_device_paths)];
static int keep_random_devices_open = 1;

#   if defined(__linux) && defined(DEVRANDOM_WAIT) \
       && defined(OPENSSL_RAND_SEED_GETRANDOM)
static void *shm_addr;

static void cleanup_shm(void)
{
    shmdt(shm_addr);
}


static int wait_random_seeded(void)
{
    static int seeded = OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID < 0;
    static const int kernel_version[] = { DEVRANDOM_SAFE_KERNEL };
    int kernel[2];
    int shm_id, fd, r;
    char c, *p;
    struct utsname un;
    fd_set fds;

    if (!seeded) {
        
        if ((shm_id = shmget(OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID, 1, 0)) == -1) {
            
            if (uname(&un) == 0) {
                kernel[0] = atoi(un.release);
                p = strchr(un.release, '.');
                kernel[1] = p == NULL ? 0 : atoi(p + 1);
                if (kernel[0] > kernel_version[0]
                    || (kernel[0] == kernel_version[0]
                        && kernel[1] >= kernel_version[1])) {
                    return 0;
                }
            }
            
            if ((fd = open(DEVRANDOM_WAIT, O_RDONLY)) != -1) {
                if (DEVRANDM_WAIT_USE_SELECT && fd < FD_SETSIZE) {
                    FD_ZERO(&fds);
                    FD_SET(fd, &fds);
                    while ((r = select(fd + 1, &fds, NULL, NULL, NULL)) < 0
                           && errno == EINTR);
                } else {
                    while ((r = read(fd, &c, 1)) < 0 && errno == EINTR);
                }
                close(fd);
                if (r == 1) {
                    seeded = 1;
                    
                    shm_id = shmget(OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID, 1,
                                    IPC_CREAT | S_IRUSR | S_IRGRP | S_IROTH);
                }
            }
        }
        if (shm_id != -1) {
            seeded = 1;
            
            shm_addr = shmat(shm_id, NULL, SHM_RDONLY);
            if (shm_addr != (void *)-1)
                OPENSSL_atexit(&cleanup_shm);
        }
    }
    return seeded;
}
#   else 
static int wait_random_seeded(void)
{
    return 1;
}
#   endif


static int check_random_device(struct random_device *rd)
{
    struct stat st;

    return rd->fd != -1
           && fstat(rd->fd, &st) != -1
           && rd->dev == st.st_dev
           && rd->ino == st.st_ino
           && ((rd->mode ^ st.st_mode) & ~(S_IRWXU | S_IRWXG | S_IRWXO)) == 0
           && rd->rdev == st.st_rdev;
}


static int get_random_device(size_t n)
{
    struct stat st;
    struct random_device *rd = &random_devices[n];

    
    if (check_random_device(rd))
        return rd->fd;

    
    if ((rd->fd = open(random_device_paths[n], O_RDONLY)) == -1)
        return rd->fd;

    
    if (fstat(rd->fd, &st) != -1) {
        rd->dev = st.st_dev;
        rd->ino = st.st_ino;
        rd->mode = st.st_mode;
        rd->rdev = st.st_rdev;
    } else {
        close(rd->fd);
        rd->fd = -1;
    }

    return rd->fd;
}


static void close_random_device(size_t n)
{
    struct random_device *rd = &random_devices[n];

    if (check_random_device(rd))
        close(rd->fd);
    rd->fd = -1;
}

int ossl_rand_pool_init(void)
{
    size_t i;

    for (i = 0; i < OSSL_NELEM(random_devices); i++)
        random_devices[i].fd = -1;

    return 1;
}

void ossl_rand_pool_cleanup(void)
{
    size_t i;

    for (i = 0; i < OSSL_NELEM(random_devices); i++)
        close_random_device(i);
}

void ossl_rand_pool_keep_random_devices_open(int keep)
{
    if (!keep)
        ossl_rand_pool_cleanup();

    keep_random_devices_open = keep;
}

#  else     

int ossl_rand_pool_init(void)
{
    return 1;
}

void ossl_rand_pool_cleanup(void)
{
}

void ossl_rand_pool_keep_random_devices_open(int keep)
{
}

#  endif    


size_t ossl_pool_acquire_entropy(RAND_POOL *pool)
{
#  if defined(OPENSSL_RAND_SEED_NONE)
    return ossl_rand_pool_entropy_available(pool);
#  else
    size_t entropy_available = 0;

    (void)entropy_available;    

#   if defined(OPENSSL_RAND_SEED_GETRANDOM)
    {
        size_t bytes_needed;
        unsigned char *buffer;
        ssize_t bytes;
        
        int attempts = 3;

        bytes_needed = ossl_rand_pool_bytes_needed(pool, 1 );
        while (bytes_needed != 0 && attempts-- > 0) {
            buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
            bytes = syscall_random(buffer, bytes_needed);
            if (bytes > 0) {
                ossl_rand_pool_add_end(pool, bytes, 8 * bytes);
                bytes_needed -= bytes;
                attempts = 3; 
            } else if (bytes < 0 && errno != EINTR) {
                break;
            }
        }
    }
    entropy_available = ossl_rand_pool_entropy_available(pool);
    if (entropy_available > 0)
        return entropy_available;
#   endif

#   if defined(OPENSSL_RAND_SEED_LIBRANDOM)
    {
        
    }
#   endif

#   if defined(OPENSSL_RAND_SEED_DEVRANDOM)
    if (wait_random_seeded()) {
        size_t bytes_needed;
        unsigned char *buffer;
        size_t i;

        bytes_needed = ossl_rand_pool_bytes_needed(pool, 1 );
        for (i = 0; bytes_needed > 0 && i < OSSL_NELEM(random_device_paths);
             i++) {
            ssize_t bytes = 0;
            
            int attempts = 3;
            const int fd = get_random_device(i);

            if (fd == -1)
                continue;

            while (bytes_needed != 0 && attempts-- > 0) {
                buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
                bytes = read(fd, buffer, bytes_needed);

                if (bytes > 0) {
                    ossl_rand_pool_add_end(pool, bytes, 8 * bytes);
                    bytes_needed -= bytes;
                    attempts = 3; 
                } else if (bytes < 0 && errno != EINTR) {
                    break;
                }
            }
            if (bytes < 0 || !keep_random_devices_open)
                close_random_device(i);

            bytes_needed = ossl_rand_pool_bytes_needed(pool, 1);
        }
        entropy_available = ossl_rand_pool_entropy_available(pool);
        if (entropy_available > 0)
            return entropy_available;
    }
#   endif

#   if defined(OPENSSL_RAND_SEED_RDTSC)
    entropy_available = ossl_prov_acquire_entropy_from_tsc(pool);
    if (entropy_available > 0)
        return entropy_available;
#   endif

#   if defined(OPENSSL_RAND_SEED_RDCPU)
    entropy_available = ossl_prov_acquire_entropy_from_cpu(pool);
    if (entropy_available > 0)
        return entropy_available;
#   endif

#   if defined(OPENSSL_RAND_SEED_EGD)
    {
        static const char *paths[] = { DEVRANDOM_EGD, NULL };
        size_t bytes_needed;
        unsigned char *buffer;
        int i;

        bytes_needed = ossl_rand_pool_bytes_needed(pool, 1 );
        for (i = 0; bytes_needed > 0 && paths[i] != NULL; i++) {
            size_t bytes = 0;
            int num;

            buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
            num = RAND_query_egd_bytes(paths[i],
                                       buffer, (int)bytes_needed);
            if (num == (int)bytes_needed)
                bytes = bytes_needed;

            ossl_rand_pool_add_end(pool, bytes, 8 * bytes);
            bytes_needed = ossl_rand_pool_bytes_needed(pool, 1);
        }
        entropy_available = ossl_rand_pool_entropy_available(pool);
        if (entropy_available > 0)
            return entropy_available;
    }
#   endif

    return ossl_rand_pool_entropy_available(pool);
#  endif
}
# endif
#endif

#if (defined(OPENSSL_SYS_UNIX) && !defined(OPENSSL_SYS_VXWORKS)) \
     || defined(__DJGPP__)
int ossl_pool_add_nonce_data(RAND_POOL *pool)
{
    struct {
        pid_t pid;
        CRYPTO_THREAD_ID tid;
        uint64_t time;
    } data;

    
    memset(&data, 0, sizeof(data));

    
    data.pid = getpid();
    data.tid = CRYPTO_THREAD_get_current_id();
    data.time = get_time_stamp();

    return ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
}


static uint64_t get_time_stamp(void)
{
# if defined(OSSL_POSIX_TIMER_OKAY)
    {
        struct timespec ts;

        if (clock_gettime(CLOCK_REALTIME, &ts) == 0)
            return TWO32TO64(ts.tv_sec, ts.tv_nsec);
    }
# endif
# if defined(__unix__) \
     || (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L)
    {
        struct timeval tv;

        if (gettimeofday(&tv, NULL) == 0)
            return TWO32TO64(tv.tv_sec, tv.tv_usec);
    }
# endif
    return time(NULL);
}

#endif 
