2012-06-25 20:13:31 +02:00
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/*
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* QEMU Random Number Generator Backend
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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2016-01-29 18:49:54 +01:00
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#include "qemu/osdep.h"
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2013-04-08 16:55:25 +02:00
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#include "sysemu/rng.h"
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#include "sysemu/char.h"
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include/qemu/osdep.h: Don't include qapi/error.h
Commit 57cb38b included qapi/error.h into qemu/osdep.h to get the
Error typedef. Since then, we've moved to include qemu/osdep.h
everywhere. Its file comment explains: "To avoid getting into
possible circular include dependencies, this file should not include
any other QEMU headers, with the exceptions of config-host.h,
compiler.h, os-posix.h and os-win32.h, all of which are doing a
similar job to this file and are under similar constraints."
qapi/error.h doesn't do a similar job, and it doesn't adhere to
similar constraints: it includes qapi-types.h. That's in excess of
100KiB of crap most .c files don't actually need.
Add the typedef to qemu/typedefs.h, and include that instead of
qapi/error.h. Include qapi/error.h in .c files that need it and don't
get it now. Include qapi-types.h in qom/object.h for uint16List.
Update scripts/clean-includes accordingly. Update it further to match
reality: replace config.h by config-target.h, add sysemu/os-posix.h,
sysemu/os-win32.h. Update the list of includes in the qemu/osdep.h
comment quoted above similarly.
This reduces the number of objects depending on qapi/error.h from "all
of them" to less than a third. Unfortunately, the number depending on
qapi-types.h shrinks only a little. More work is needed for that one.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
[Fix compilation without the spice devel packages. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-14 09:01:28 +01:00
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#include "qapi/error.h"
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2012-12-17 18:19:43 +01:00
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#include "qapi/qmp/qerror.h"
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2012-06-25 20:13:31 +02:00
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#define TYPE_RNG_EGD "rng-egd"
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#define RNG_EGD(obj) OBJECT_CHECK(RngEgd, (obj), TYPE_RNG_EGD)
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typedef struct RngEgd
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{
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RngBackend parent;
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2016-10-22 11:52:52 +02:00
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CharBackend chr;
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2012-06-25 20:13:31 +02:00
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char *chr_name;
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} RngEgd;
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2016-03-03 09:37:18 +01:00
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static void rng_egd_request_entropy(RngBackend *b, RngRequest *req)
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2012-06-25 20:13:31 +02:00
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{
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RngEgd *s = RNG_EGD(b);
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2016-03-03 09:37:18 +01:00
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size_t size = req->size;
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2012-06-25 20:13:31 +02:00
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while (size > 0) {
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uint8_t header[2];
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uint8_t len = MIN(size, 255);
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/* synchronous entropy request */
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header[0] = 0x02;
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header[1] = len;
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2016-09-06 15:56:04 +02:00
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/* XXX this blocks entire thread. Rewrite to use
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* qemu_chr_fe_write and background I/O callbacks */
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2016-10-22 11:52:55 +02:00
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qemu_chr_fe_write_all(&s->chr, header, sizeof(header));
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2012-06-25 20:13:31 +02:00
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size -= len;
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}
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}
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static int rng_egd_chr_can_read(void *opaque)
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{
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RngEgd *s = RNG_EGD(opaque);
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2016-03-03 14:16:11 +01:00
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RngRequest *req;
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2012-06-25 20:13:31 +02:00
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int size = 0;
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2016-03-03 14:16:11 +01:00
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QSIMPLEQ_FOREACH(req, &s->parent.requests, next) {
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2012-06-25 20:13:31 +02:00
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size += req->size - req->offset;
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}
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return size;
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}
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static void rng_egd_chr_read(void *opaque, const uint8_t *buf, int size)
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{
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RngEgd *s = RNG_EGD(opaque);
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2013-11-21 09:42:51 +01:00
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size_t buf_offset = 0;
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2012-06-25 20:13:31 +02:00
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2016-03-03 14:16:11 +01:00
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while (size > 0 && !QSIMPLEQ_EMPTY(&s->parent.requests)) {
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RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests);
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2012-06-25 20:13:31 +02:00
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int len = MIN(size, req->size - req->offset);
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2013-11-21 09:42:51 +01:00
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memcpy(req->data + req->offset, buf + buf_offset, len);
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buf_offset += len;
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2012-06-25 20:13:31 +02:00
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req->offset += len;
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size -= len;
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if (req->offset == req->size) {
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req->receive_entropy(req->opaque, req->data, req->size);
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2016-03-03 09:37:17 +01:00
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rng_backend_finalize_request(&s->parent, req);
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2012-06-25 20:13:31 +02:00
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}
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}
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}
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static void rng_egd_opened(RngBackend *b, Error **errp)
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{
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RngEgd *s = RNG_EGD(b);
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2016-12-07 14:20:22 +01:00
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Chardev *chr;
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2012-06-25 20:13:31 +02:00
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if (s->chr_name == NULL) {
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2015-03-17 11:54:50 +01:00
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error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
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"chardev", "a valid character device");
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2012-06-25 20:13:31 +02:00
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return;
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}
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2016-10-22 11:52:52 +02:00
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chr = qemu_chr_find(s->chr_name);
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if (chr == NULL) {
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2015-03-16 08:57:47 +01:00
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error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
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"Device '%s' not found", s->chr_name);
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2012-06-25 20:13:31 +02:00
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return;
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}
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2016-10-22 11:52:52 +02:00
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if (!qemu_chr_fe_init(&s->chr, chr, errp)) {
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return;
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}
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2013-03-27 20:29:40 +01:00
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2012-06-25 20:13:31 +02:00
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/* FIXME we should resubmit pending requests when the CDS reconnects. */
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2016-10-22 11:52:55 +02:00
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qemu_chr_fe_set_handlers(&s->chr, rng_egd_chr_can_read,
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2016-10-22 11:53:03 +02:00
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rng_egd_chr_read, NULL, s, NULL, true);
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2012-06-25 20:13:31 +02:00
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}
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static void rng_egd_set_chardev(Object *obj, const char *value, Error **errp)
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{
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RngBackend *b = RNG_BACKEND(obj);
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RngEgd *s = RNG_EGD(b);
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if (b->opened) {
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2015-03-17 11:54:50 +01:00
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error_setg(errp, QERR_PERMISSION_DENIED);
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2012-06-25 20:13:31 +02:00
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} else {
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2014-09-04 18:10:47 +02:00
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g_free(s->chr_name);
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2012-06-25 20:13:31 +02:00
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s->chr_name = g_strdup(value);
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}
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}
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static char *rng_egd_get_chardev(Object *obj, Error **errp)
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{
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RngEgd *s = RNG_EGD(obj);
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2016-12-07 14:20:22 +01:00
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Chardev *chr = qemu_chr_fe_get_driver(&s->chr);
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2012-06-25 20:13:31 +02:00
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2016-10-22 11:52:55 +02:00
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if (chr && chr->label) {
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return g_strdup(chr->label);
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2012-06-25 20:13:31 +02:00
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}
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return NULL;
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}
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static void rng_egd_init(Object *obj)
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{
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object_property_add_str(obj, "chardev",
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rng_egd_get_chardev, rng_egd_set_chardev,
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NULL);
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}
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static void rng_egd_finalize(Object *obj)
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{
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RngEgd *s = RNG_EGD(obj);
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2016-10-22 11:52:58 +02:00
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qemu_chr_fe_deinit(&s->chr);
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2012-06-25 20:13:31 +02:00
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g_free(s->chr_name);
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}
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static void rng_egd_class_init(ObjectClass *klass, void *data)
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{
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RngBackendClass *rbc = RNG_BACKEND_CLASS(klass);
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rbc->request_entropy = rng_egd_request_entropy;
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rbc->opened = rng_egd_opened;
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}
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2013-01-10 16:19:07 +01:00
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static const TypeInfo rng_egd_info = {
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2012-06-25 20:13:31 +02:00
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.name = TYPE_RNG_EGD,
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.parent = TYPE_RNG_BACKEND,
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.instance_size = sizeof(RngEgd),
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.class_init = rng_egd_class_init,
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.instance_init = rng_egd_init,
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.instance_finalize = rng_egd_finalize,
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};
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static void register_types(void)
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{
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type_register_static(&rng_egd_info);
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}
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type_init(register_types);
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