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