qemu

char-udp.c (7263B)

---

 /*
  * 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);