3e019deaed
for unknown events. A number of modules return EINVAL in this instance, and I have left those alone for now and instead taught MOD_QUIESCE to accept this as "didn't do anything".
232 lines
5.3 KiB
C
232 lines
5.3 KiB
C
/*-
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* Copyright (c) 2000-2004 Mark R V Murray
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/filio.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/poll.h>
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#include <sys/proc.h>
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#include <sys/selinfo.h>
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#include <sys/uio.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <dev/random/randomdev.h>
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#define RANDOM_MINOR 0
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static d_close_t random_close;
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static d_read_t random_read;
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static d_write_t random_write;
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static d_ioctl_t random_ioctl;
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static d_poll_t random_poll;
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static struct cdevsw random_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_close = random_close,
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.d_read = random_read,
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.d_write = random_write,
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.d_ioctl = random_ioctl,
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.d_poll = random_poll,
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.d_name = "random",
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};
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struct random_systat random_systat;
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/* For use with make_dev(9)/destroy_dev(9). */
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static struct cdev *random_dev;
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/* Used to fake out unused random calls in random_systat */
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void
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random_null_func(void)
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{
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}
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/* ARGSUSED */
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static int
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random_close(struct cdev *dev __unused, int flags, int fmt __unused,
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struct thread *td)
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{
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if ((flags & FWRITE) && (suser(td) == 0)
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&& (securelevel_gt(td->td_ucred, 0) == 0)) {
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(*random_systat.reseed)();
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random_systat.seeded = 1;
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}
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return (0);
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}
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/* ARGSUSED */
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static int
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random_read(struct cdev *dev __unused, struct uio *uio, int flag)
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{
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int c, error = 0;
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void *random_buf;
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/* Blocking logic */
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while (!random_systat.seeded && !error) {
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if (flag & IO_NDELAY)
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error = EWOULDBLOCK;
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else {
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/* No complaints please. This is temporary! */
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printf("Entropy device is blocking. "
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"Dance fandango on keyboard to unblock.\n");
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error = tsleep(&random_systat,
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PUSER | PCATCH, "block", 0);
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}
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}
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/* The actual read */
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if (!error) {
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random_buf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
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while (uio->uio_resid > 0 && !error) {
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c = MIN(uio->uio_resid, PAGE_SIZE);
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c = (*random_systat.read)(random_buf, c);
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error = uiomove(random_buf, c, uio);
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}
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free(random_buf, M_TEMP);
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}
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return (error);
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}
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/* ARGSUSED */
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static int
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random_write(struct cdev *dev __unused, struct uio *uio, int flag __unused)
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{
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int c, error = 0;
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void *random_buf;
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random_buf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
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while (uio->uio_resid > 0) {
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c = MIN((int)uio->uio_resid, PAGE_SIZE);
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error = uiomove(random_buf, c, uio);
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if (error)
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break;
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(*random_systat.write)(random_buf, c);
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}
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free(random_buf, M_TEMP);
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return (error);
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}
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/* ARGSUSED */
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static int
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random_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr __unused,
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int flags __unused, struct thread *td __unused)
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{
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int error = 0;
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switch (cmd) {
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/* Really handled in upper layer */
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case FIOASYNC:
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case FIONBIO:
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break;
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default:
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error = ENOTTY;
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}
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return (error);
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}
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/* ARGSUSED */
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static int
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random_poll(struct cdev *dev __unused, int events, struct thread *td)
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{
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int revents = 0;
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if (events & (POLLIN | POLLRDNORM)) {
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if (random_systat.seeded)
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revents = events & (POLLIN | POLLRDNORM);
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else
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selrecord(td, &random_systat.rsel);
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}
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return (revents);
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}
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/* ARGSUSED */
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static int
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random_modevent(module_t mod __unused, int type, void *data __unused)
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{
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int error = 0;
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switch (type) {
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case MOD_LOAD:
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random_ident_hardware(&random_systat);
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(*random_systat.init)();
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if (bootverbose)
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printf("random: <entropy source, %s>\n",
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random_systat.ident);
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random_dev = make_dev(&random_cdevsw, RANDOM_MINOR,
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UID_ROOT, GID_WHEEL, 0666, "random");
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make_dev_alias(random_dev, "urandom"); /* XXX Deprecated */
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break;
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case MOD_UNLOAD:
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(*random_systat.deinit)();
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destroy_dev(random_dev);
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break;
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case MOD_SHUTDOWN:
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return (error);
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}
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DEV_MODULE(random, random_modevent, NULL);
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