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/*
* 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 "sysemu/char.h"
#include "io/channel-socket.h"
#include "qapi/error.h"
#include "char-io.h"
/***********************************************************/
/* UDP Net console */
typedef struct {
Chardev parent;
QIOChannel *ioc;
uint8_t buf[CHR_READ_BUF_LEN];
int bufcnt;
int bufptr;
int max_size;
} UdpChardev;
#define UDP_CHARDEV(obj) OBJECT_CHECK(UdpChardev, (obj), 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 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
*/
while (s->max_size > 0 && s->bufptr < s->bufcnt) {
qemu_chr_be_write(chr, &s->buf[s->bufptr], 1);
s->bufptr++;
s->max_size = qemu_chr_be_can_write(chr);
}
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, NULL);
return FALSE;
}
s->bufcnt = ret;
s->bufptr = 0;
while (s->max_size > 0 && s->bufptr < s->bufcnt) {
qemu_chr_be_write(chr, &s->buf[s->bufptr], 1);
s->bufptr++;
s->max_size = qemu_chr_be_can_write(chr);
}
return TRUE;
}
static void udp_chr_update_read_handler(Chardev *chr,
GMainContext *context)
{
UdpChardev *s = UDP_CHARDEV(chr);
remove_fd_in_watch(chr, NULL);
if (s->ioc) {
chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
udp_chr_read_poll,
udp_chr_read, chr,
context);
}
}
static void char_udp_finalize(Object *obj)
{
Chardev *chr = CHARDEV(obj);
UdpChardev *s = UDP_CHARDEV(obj);
remove_fd_in_watch(chr, NULL);
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;
SocketAddress *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(SocketAddress, 1);
addr->type = SOCKET_ADDRESS_KIND_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(SocketAddress, 1);
addr->type = SOCKET_ADDRESS_KIND_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;
QIOChannelSocket *sioc = qio_channel_socket_new();
char *name;
UdpChardev *s = UDP_CHARDEV(chr);
if (qio_channel_socket_dgram_sync(sioc,
udp->local, udp->remote,
errp) < 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);
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