char: move udp chardev in its own file

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Eric Blake <eblake@redhat.com>

chardev/Makefile.objs

@@ -5,5 +5,6 @@ chardev-obj-y += char-mux.o
 chardev-obj-y += char-null.o
 chardev-obj-y += char-ringbuf.o
 chardev-obj-y += char-socket.o
+chardev-obj-y += char-udp.o
 chardev-obj-$(CONFIG_WIN32) += char-win.o
 chardev-obj-$(CONFIG_WIN32) += char-win-stdio.o

chardev/char-udp.c

@@ -0,0 +1,233 @@
+/*
+ * 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);
+        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);
+    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);
+    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);