qemu/chardev/char-udp.c
Markus Armbruster 935a867c87 qapi: Convert simple union SocketAddressLegacy to flat one
Simple unions predate flat unions.  Having both complicates the QAPI
schema language and the QAPI generator.  We haven't been using simple
unions in new code for a long time, because they are less flexible and
somewhat awkward on the wire.

To prepare for their removal, convert simple union SocketAddressLegacy
to an equivalent flat one, with existing enum SocketAddressType
replacing implicit enum type SocketAddressLegacyKind.  Adds some
boilerplate to the schema, which is a bit ugly, but a lot easier to
maintain than the simple union feature.

Cc: "Daniel P. Berrangé" <berrange@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210917143134.412106-9-armbru@redhat.com>
2021-09-27 08:23:25 +02:00

247 lines
7.1 KiB
C

/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "chardev/char.h"
#include "io/channel-socket.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "chardev/char-io.h"
#include "qom/object.h"
/***********************************************************/
/* UDP Net console */
struct UdpChardev {
Chardev parent;
QIOChannel *ioc;
uint8_t buf[CHR_READ_BUF_LEN];
int bufcnt;
int bufptr;
int max_size;
};
typedef struct UdpChardev UdpChardev;
DECLARE_INSTANCE_CHECKER(UdpChardev, UDP_CHARDEV,
TYPE_CHARDEV_UDP)
/* Called with chr_write_lock held. */
static int udp_chr_write(Chardev *chr, const uint8_t *buf, int len)
{
UdpChardev *s = UDP_CHARDEV(chr);
return qio_channel_write(
s->ioc, (const char *)buf, len, NULL);
}
static void udp_chr_flush_buffer(UdpChardev *s)
{
Chardev *chr = CHARDEV(s);
while (s->max_size > 0 && s->bufptr < s->bufcnt) {
int n = MIN(s->max_size, s->bufcnt - s->bufptr);
qemu_chr_be_write(chr, &s->buf[s->bufptr], n);
s->bufptr += n;
s->max_size = qemu_chr_be_can_write(chr);
}
}
static int udp_chr_read_poll(void *opaque)
{
Chardev *chr = CHARDEV(opaque);
UdpChardev *s = UDP_CHARDEV(opaque);
s->max_size = qemu_chr_be_can_write(chr);
/* If there were any stray characters in the queue process them
* first
*/
udp_chr_flush_buffer(s);
return s->max_size;
}
static gboolean udp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
{
Chardev *chr = CHARDEV(opaque);
UdpChardev *s = UDP_CHARDEV(opaque);
ssize_t ret;
if (s->max_size == 0) {
return TRUE;
}
ret = qio_channel_read(
s->ioc, (char *)s->buf, sizeof(s->buf), NULL);
if (ret <= 0) {
remove_fd_in_watch(chr);
return FALSE;
}
s->bufcnt = ret;
s->bufptr = 0;
udp_chr_flush_buffer(s);
return TRUE;
}
static void udp_chr_update_read_handler(Chardev *chr)
{
UdpChardev *s = UDP_CHARDEV(chr);
remove_fd_in_watch(chr);
if (s->ioc) {
chr->gsource = io_add_watch_poll(chr, s->ioc,
udp_chr_read_poll,
udp_chr_read, chr,
chr->gcontext);
}
}
static void char_udp_finalize(Object *obj)
{
Chardev *chr = CHARDEV(obj);
UdpChardev *s = UDP_CHARDEV(obj);
remove_fd_in_watch(chr);
if (s->ioc) {
object_unref(OBJECT(s->ioc));
}
qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
}
static void qemu_chr_parse_udp(QemuOpts *opts, ChardevBackend *backend,
Error **errp)
{
const char *host = qemu_opt_get(opts, "host");
const char *port = qemu_opt_get(opts, "port");
const char *localaddr = qemu_opt_get(opts, "localaddr");
const char *localport = qemu_opt_get(opts, "localport");
bool has_local = false;
SocketAddressLegacy *addr;
ChardevUdp *udp;
backend->type = CHARDEV_BACKEND_KIND_UDP;
if (host == NULL || strlen(host) == 0) {
host = "localhost";
}
if (port == NULL || strlen(port) == 0) {
error_setg(errp, "chardev: udp: remote port not specified");
return;
}
if (localport == NULL || strlen(localport) == 0) {
localport = "0";
} else {
has_local = true;
}
if (localaddr == NULL || strlen(localaddr) == 0) {
localaddr = "";
} else {
has_local = true;
}
udp = backend->u.udp.data = g_new0(ChardevUdp, 1);
qemu_chr_parse_common(opts, qapi_ChardevUdp_base(udp));
addr = g_new0(SocketAddressLegacy, 1);
addr->type = SOCKET_ADDRESS_TYPE_INET;
addr->u.inet.data = g_new(InetSocketAddress, 1);
*addr->u.inet.data = (InetSocketAddress) {
.host = g_strdup(host),
.port = g_strdup(port),
.has_ipv4 = qemu_opt_get(opts, "ipv4"),
.ipv4 = qemu_opt_get_bool(opts, "ipv4", 0),
.has_ipv6 = qemu_opt_get(opts, "ipv6"),
.ipv6 = qemu_opt_get_bool(opts, "ipv6", 0),
};
udp->remote = addr;
if (has_local) {
udp->has_local = true;
addr = g_new0(SocketAddressLegacy, 1);
addr->type = SOCKET_ADDRESS_TYPE_INET;
addr->u.inet.data = g_new(InetSocketAddress, 1);
*addr->u.inet.data = (InetSocketAddress) {
.host = g_strdup(localaddr),
.port = g_strdup(localport),
};
udp->local = addr;
}
}
static void qmp_chardev_open_udp(Chardev *chr,
ChardevBackend *backend,
bool *be_opened,
Error **errp)
{
ChardevUdp *udp = backend->u.udp.data;
SocketAddress *local_addr = socket_address_flatten(udp->local);
SocketAddress *remote_addr = socket_address_flatten(udp->remote);
QIOChannelSocket *sioc = qio_channel_socket_new();
char *name;
UdpChardev *s = UDP_CHARDEV(chr);
int ret;
ret = qio_channel_socket_dgram_sync(sioc, local_addr, remote_addr, errp);
qapi_free_SocketAddress(local_addr);
qapi_free_SocketAddress(remote_addr);
if (ret < 0) {
object_unref(OBJECT(sioc));
return;
}
name = g_strdup_printf("chardev-udp-%s", chr->label);
qio_channel_set_name(QIO_CHANNEL(sioc), name);
g_free(name);
s->ioc = QIO_CHANNEL(sioc);
/* be isn't opened until we get a connection */
*be_opened = false;
}
static void char_udp_class_init(ObjectClass *oc, void *data)
{
ChardevClass *cc = CHARDEV_CLASS(oc);
cc->parse = qemu_chr_parse_udp;
cc->open = qmp_chardev_open_udp;
cc->chr_write = udp_chr_write;
cc->chr_update_read_handler = udp_chr_update_read_handler;
}
static const TypeInfo char_udp_type_info = {
.name = TYPE_CHARDEV_UDP,
.parent = TYPE_CHARDEV,
.instance_size = sizeof(UdpChardev),
.instance_finalize = char_udp_finalize,
.class_init = char_udp_class_init,
};
static void register_types(void)
{
type_register_static(&char_udp_type_info);
}
type_init(register_types);