chardev/char-udp.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "qemu/osdep.h"
  25 #include "sysemu/char.h"
  26 #include "io/channel-socket.h"
  27 #include "qapi/error.h"
  28
  29 #include "char-io.h"
  30
  31 /***********************************************************/
  32 /* UDP Net console */
  33
  34 typedef struct {
  35     Chardev parent;
  36     QIOChannel *ioc;
  37     uint8_t buf[CHR_READ_BUF_LEN];
  38     int bufcnt;
  39     int bufptr;
  40     int max_size;
  41 } UdpChardev;
  42
  43 #define UDP_CHARDEV(obj) OBJECT_CHECK(UdpChardev, (obj), TYPE_CHARDEV_UDP)
  44
  45 /* Called with chr_write_lock held.  */
  46 static int udp_chr_write(Chardev *chr, const uint8_t *buf, int len)
  47 {
  48     UdpChardev *s = UDP_CHARDEV(chr);
  49
  50     return qio_channel_write(
  51         s->ioc, (const char *)buf, len, NULL);
  52 }
  53
  54 static int udp_chr_read_poll(void *opaque)
  55 {
  56     Chardev *chr = CHARDEV(opaque);
  57     UdpChardev *s = UDP_CHARDEV(opaque);
  58
  59     s->max_size = qemu_chr_be_can_write(chr);
  60
  61     /* If there were any stray characters in the queue process them
  62      * first
  63      */
  64     while (s->max_size > 0 && s->bufptr < s->bufcnt) {
  65         qemu_chr_be_write(chr, &s->buf[s->bufptr], 1);
  66         s->bufptr++;
  67         s->max_size = qemu_chr_be_can_write(chr);
  68     }
  69     return s->max_size;
  70 }
  71
  72 static gboolean udp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
  73 {
  74     Chardev *chr = CHARDEV(opaque);
  75     UdpChardev *s = UDP_CHARDEV(opaque);
  76     ssize_t ret;
  77
  78     if (s->max_size == 0) {
  79         return TRUE;
  80     }
  81     ret = qio_channel_read(
  82         s->ioc, (char *)s->buf, sizeof(s->buf), NULL);
  83     if (ret <= 0) {
  84         remove_fd_in_watch(chr);
  85         return FALSE;
  86     }
  87     s->bufcnt = ret;
  88
  89     s->bufptr = 0;
  90     while (s->max_size > 0 && s->bufptr < s->bufcnt) {
  91         qemu_chr_be_write(chr, &s->buf[s->bufptr], 1);
  92         s->bufptr++;
  93         s->max_size = qemu_chr_be_can_write(chr);
  94     }
  95
  96     return TRUE;
  97 }
  98
  99 static void udp_chr_update_read_handler(Chardev *chr,
 100                                         GMainContext *context)
 101 {
 102     UdpChardev *s = UDP_CHARDEV(chr);
 103
 104     remove_fd_in_watch(chr);
 105     if (s->ioc) {
 106         chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
 107                                            udp_chr_read_poll,
 108                                            udp_chr_read, chr,
 109                                            context);
 110     }
 111 }
 112
 113 static void char_udp_finalize(Object *obj)
 114 {
 115     Chardev *chr = CHARDEV(obj);
 116     UdpChardev *s = UDP_CHARDEV(obj);
 117
 118     remove_fd_in_watch(chr);
 119     if (s->ioc) {
 120         object_unref(OBJECT(s->ioc));
 121     }
 122     qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
 123 }
 124
 125 static void qemu_chr_parse_udp(QemuOpts *opts, ChardevBackend *backend,
 126                                Error **errp)
 127 {
 128     const char *host = qemu_opt_get(opts, "host");
 129     const char *port = qemu_opt_get(opts, "port");
 130     const char *localaddr = qemu_opt_get(opts, "localaddr");
 131     const char *localport = qemu_opt_get(opts, "localport");
 132     bool has_local = false;
 133     SocketAddress *addr;
 134     ChardevUdp *udp;
 135
 136     backend->type = CHARDEV_BACKEND_KIND_UDP;
 137     if (host == NULL || strlen(host) == 0) {
 138         host = "localhost";
 139     }
 140     if (port == NULL || strlen(port) == 0) {
 141         error_setg(errp, "chardev: udp: remote port not specified");
 142         return;
 143     }
 144     if (localport == NULL || strlen(localport) == 0) {
 145         localport = "0";
 146     } else {
 147         has_local = true;
 148     }
 149     if (localaddr == NULL || strlen(localaddr) == 0) {
 150         localaddr = "";
 151     } else {
 152         has_local = true;
 153     }
 154
 155     udp = backend->u.udp.data = g_new0(ChardevUdp, 1);
 156     qemu_chr_parse_common(opts, qapi_ChardevUdp_base(udp));
 157
 158     addr = g_new0(SocketAddress, 1);
 159     addr->type = SOCKET_ADDRESS_KIND_INET;
 160     addr->u.inet.data = g_new(InetSocketAddress, 1);
 161     *addr->u.inet.data = (InetSocketAddress) {
 162         .host = g_strdup(host),
 163         .port = g_strdup(port),
 164         .has_ipv4 = qemu_opt_get(opts, "ipv4"),
 165         .ipv4 = qemu_opt_get_bool(opts, "ipv4", 0),
 166         .has_ipv6 = qemu_opt_get(opts, "ipv6"),
 167         .ipv6 = qemu_opt_get_bool(opts, "ipv6", 0),
 168     };
 169     udp->remote = addr;
 170
 171     if (has_local) {
 172         udp->has_local = true;
 173         addr = g_new0(SocketAddress, 1);
 174         addr->type = SOCKET_ADDRESS_KIND_INET;
 175         addr->u.inet.data = g_new(InetSocketAddress, 1);
 176         *addr->u.inet.data = (InetSocketAddress) {
 177             .host = g_strdup(localaddr),
 178             .port = g_strdup(localport),
 179         };
 180         udp->local = addr;
 181     }
 182 }
 183
 184 static void qmp_chardev_open_udp(Chardev *chr,
 185                                  ChardevBackend *backend,
 186                                  bool *be_opened,
 187                                  Error **errp)
 188 {
 189     ChardevUdp *udp = backend->u.udp.data;
 190     QIOChannelSocket *sioc = qio_channel_socket_new();
 191     char *name;
 192     UdpChardev *s = UDP_CHARDEV(chr);
 193
 194     if (qio_channel_socket_dgram_sync(sioc,
 195                                       udp->local, udp->remote,
 196                                       errp) < 0) {
 197         object_unref(OBJECT(sioc));
 198         return;
 199     }
 200
 201     name = g_strdup_printf("chardev-udp-%s", chr->label);
 202     qio_channel_set_name(QIO_CHANNEL(sioc), name);
 203     g_free(name);
 204
 205     s->ioc = QIO_CHANNEL(sioc);
 206     /* be isn't opened until we get a connection */
 207     *be_opened = false;
 208 }
 209
 210 static void char_udp_class_init(ObjectClass *oc, void *data)
 211 {
 212     ChardevClass *cc = CHARDEV_CLASS(oc);
 213
 214     cc->parse = qemu_chr_parse_udp;
 215     cc->open = qmp_chardev_open_udp;
 216     cc->chr_write = udp_chr_write;
 217     cc->chr_update_read_handler = udp_chr_update_read_handler;
 218 }
 219
 220 static const TypeInfo char_udp_type_info = {
 221     .name = TYPE_CHARDEV_UDP,
 222     .parent = TYPE_CHARDEV,
 223     .instance_size = sizeof(UdpChardev),
 224     .instance_finalize = char_udp_finalize,
 225     .class_init = char_udp_class_init,
 226 };
 227
 228 static void register_types(void)
 229 {
 230     type_register_static(&char_udp_type_info);
 231 }
 232
 233 type_init(register_types);