static void
do_save(const char *const filename)
{
int est1, est2;
rndpoolstat_t rp;
rndsave_t rs;
SHA1_CTX s;
int fd;
fd = open(_PATH_URANDOM, O_RDONLY, 0644);
if (fd < 0) {
err(1, "device open");
}
if (ioctl(fd, RNDGETPOOLSTAT, &rp) < 0) {
err(1, "ioctl(RNDGETPOOLSTAT)");
}
est1 = rp.curentropy;
if (read(fd, rs.data, sizeof(rs.data)) != sizeof(rs.data)) {
err(1, "entropy read");
}
if (ioctl(fd, RNDGETPOOLSTAT, &rp) < 0) {
err(1, "ioctl(RNDGETPOOLSTAT)");
}
est2 = rp.curentropy;
if (est1 - est2 < 0) {
rs.entropy = 0;
} else {
rs.entropy = est1 - est2;
}
SHA1Init(&s);
SHA1Update(&s, (uint8_t *)&rs.entropy, sizeof(rs.entropy));
SHA1Update(&s, rs.data, sizeof(rs.data));
SHA1Final(rs.digest, &s);
close(fd);
unlink(filename);
fd = open(filename, O_CREAT|O_EXCL|O_WRONLY, 0600);
if (fd < 0) {
err(1, "output open");
}
if (write(fd, &rs, sizeof(rs)) != sizeof(rs)) {
unlink(filename);
fsync_range(fd, FDATASYNC|FDISKSYNC, (off_t)0, (off_t)0);
err(1, "write");
}
fsync_range(fd, FDATASYNC|FDISKSYNC, (off_t)0, (off_t)0);
close(fd);
}
static void
do_load(const char *const filename)
{
int fd;
rndsave_t rs, rszero;
rnddata_t rd;
SHA1_CTX s;
uint8_t digest[SHA1_DIGEST_LENGTH];
fd = open(filename, O_RDWR, 0600);
if (fd < 0) {
err(1, "input open");
}
unlink(filename);
if (read(fd, &rs, sizeof(rs)) != sizeof(rs)) {
err(1, "read");
}
memset(&rszero, 0, sizeof(rszero));
if (pwrite(fd, &rszero, sizeof(rszero), (off_t)0) != sizeof(rszero))
err(1, "overwrite");
fsync_range(fd, FDATASYNC|FDISKSYNC, (off_t)0, (off_t)0);
close(fd);
SHA1Init(&s);
SHA1Update(&s, (uint8_t *)&rs.entropy, sizeof(rs.entropy));
SHA1Update(&s, rs.data, sizeof(rs.data));
SHA1Final(digest, &s);
if (memcmp(digest, rs.digest, sizeof(digest))) {
errx(1, "bad digest");
}
rd.len = MIN(sizeof(rd.data), sizeof(rs.data));
rd.entropy = rs.entropy;
memcpy(rd.data, rs.data, MIN(sizeof(rd.data), sizeof(rs.data)));
fd = open(_PATH_URANDOM, O_RDWR, 0644);
if (fd < 0) {
err(1, "device open");
}
if (ioctl(fd, RNDADDDATA, &rd) < 0) {
err(1, "ioctl");
}
close(fd);
}
int
rumpuser_syncfd(int fd, int flags, uint64_t start, uint64_t len)
{
int rv = 0;
/*
* For now, assume fd is regular file and does not care
* about read syncing
*/
if ((flags & RUMPUSER_SYNCFD_BOTH) == 0) {
rv = EINVAL;
goto out;
}
if ((flags & RUMPUSER_SYNCFD_WRITE) == 0) {
rv = 0;
goto out;
}
#ifdef __NetBSD__
{
int fsflags = FDATASYNC;
if (fsflags & RUMPUSER_SYNCFD_SYNC)
fsflags |= FDISKSYNC;
if (fsync_range(fd, fsflags, start, len) == -1)
rv = errno;
}
#else
/* el-simplo */
if (fsync(fd) == -1)
rv = errno;
#endif
out:
ET(rv);
}
