chardev/spice.c

   1 #include "qemu/osdep.h"
   2 #include "trace.h"
   3 #include "ui/qemu-spice.h"
   4 #include "chardev/char.h"
   5 #include "chardev/spice.h"
   6 #include "qapi/error.h"
   7 #include "qemu/error-report.h"
   8 #include "qemu/module.h"
   9 #include "qemu/option.h"
  10 #include <spice/protocol.h>
  11
  12 typedef struct SpiceCharSource {
  13     GSource               source;
  14     SpiceChardev       *scd;
  15 } SpiceCharSource;
  16
  17 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
  18 {
  19     SpiceChardev *scd = container_of(sin, SpiceChardev, sin);
  20     Chardev *chr = CHARDEV(scd);
  21     ssize_t out = 0;
  22     ssize_t last_out;
  23     uint8_t* p = (uint8_t*)buf;
  24
  25     while (len > 0) {
  26         int can_write = qemu_chr_be_can_write(chr);
  27         last_out = MIN(len, can_write);
  28         if (last_out <= 0) {
  29             break;
  30         }
  31         qemu_chr_be_write(chr, p, last_out);
  32         out += last_out;
  33         len -= last_out;
  34         p += last_out;
  35     }
  36
  37     trace_spice_vmc_write(out, len + out);
  38     return out;
  39 }
  40
  41 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
  42 {
  43     SpiceChardev *scd = container_of(sin, SpiceChardev, sin);
  44     int bytes = MIN(len, scd->datalen);
  45
  46     if (bytes > 0) {
  47         memcpy(buf, scd->datapos, bytes);
  48         scd->datapos += bytes;
  49         scd->datalen -= bytes;
  50         assert(scd->datalen >= 0);
  51     }
  52     if (scd->datalen == 0) {
  53         scd->datapos = 0;
  54         scd->blocked = false;
  55     }
  56     trace_spice_vmc_read(bytes, len);
  57     return bytes;
  58 }
  59
  60 static void vmc_event(SpiceCharDeviceInstance *sin, uint8_t event)
  61 {
  62     SpiceChardev *scd = container_of(sin, SpiceChardev, sin);
  63     Chardev *chr = CHARDEV(scd);
  64     int chr_event;
  65
  66     switch (event) {
  67     case SPICE_PORT_EVENT_BREAK:
  68         chr_event = CHR_EVENT_BREAK;
  69         break;
  70     default:
  71         return;
  72     }
  73
  74     trace_spice_vmc_event(chr_event);
  75     qemu_chr_be_event(chr, chr_event);
  76 }
  77
  78 static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
  79 {
  80     SpiceChardev *scd = container_of(sin, SpiceChardev, sin);
  81     Chardev *chr = CHARDEV(scd);
  82
  83     if ((chr->be_open && connected) ||
  84         (!chr->be_open && !connected)) {
  85         return;
  86     }
  87
  88     qemu_chr_be_event(chr,
  89                       connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
  90 }
  91
  92 static SpiceCharDeviceInterface vmc_interface = {
  93     .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
  94     .base.description   = "spice virtual channel char device",
  95     .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
  96     .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
  97     .state              = vmc_state,
  98     .write              = vmc_write,
  99     .read               = vmc_read,
 100     .event              = vmc_event,
 101 #if SPICE_SERVER_VERSION >= 0x000c06
 102     .flags              = SPICE_CHAR_DEVICE_NOTIFY_WRITABLE,
 103 #endif
 104 };
 105
 106
 107 static void vmc_register_interface(SpiceChardev *scd)
 108 {
 109     if (scd->active) {
 110         return;
 111     }
 112     scd->sin.base.sif = &vmc_interface.base;
 113     qemu_spice.add_interface(&scd->sin.base);
 114     scd->active = true;
 115     trace_spice_vmc_register_interface(scd);
 116 }
 117
 118 static void vmc_unregister_interface(SpiceChardev *scd)
 119 {
 120     if (!scd->active) {
 121         return;
 122     }
 123     spice_server_remove_interface(&scd->sin.base);
 124     scd->active = false;
 125     trace_spice_vmc_unregister_interface(scd);
 126 }
 127
 128 static gboolean spice_char_source_prepare(GSource *source, gint *timeout)
 129 {
 130     SpiceCharSource *src = (SpiceCharSource *)source;
 131     Chardev *chr = CHARDEV(src->scd);
 132
 133     *timeout = -1;
 134
 135     if (!chr->be_open) {
 136         return true;
 137     }
 138
 139     return !src->scd->blocked;
 140 }
 141
 142 static gboolean spice_char_source_check(GSource *source)
 143 {
 144     SpiceCharSource *src = (SpiceCharSource *)source;
 145     Chardev *chr = CHARDEV(src->scd);
 146
 147     if (!chr->be_open) {
 148         return true;
 149     }
 150
 151     return !src->scd->blocked;
 152 }
 153
 154 static gboolean spice_char_source_dispatch(GSource *source,
 155     GSourceFunc callback, gpointer user_data)
 156 {
 157     SpiceCharSource *src = (SpiceCharSource *)source;
 158     Chardev *chr = CHARDEV(src->scd);
 159     GIOFunc func = (GIOFunc)callback;
 160     GIOCondition cond = chr->be_open ? G_IO_OUT : G_IO_HUP;
 161
 162     return func(NULL, cond, user_data);
 163 }
 164
 165 static GSourceFuncs SpiceCharSourceFuncs = {
 166     .prepare  = spice_char_source_prepare,
 167     .check    = spice_char_source_check,
 168     .dispatch = spice_char_source_dispatch,
 169 };
 170
 171 static GSource *spice_chr_add_watch(Chardev *chr, GIOCondition cond)
 172 {
 173     SpiceChardev *scd = SPICE_CHARDEV(chr);
 174     SpiceCharSource *src;
 175
 176     assert(cond & G_IO_OUT);
 177
 178     src = (SpiceCharSource *)g_source_new(&SpiceCharSourceFuncs,
 179                                           sizeof(SpiceCharSource));
 180     src->scd = scd;
 181
 182     return (GSource *)src;
 183 }
 184
 185 static int spice_chr_write(Chardev *chr, const uint8_t *buf, int len)
 186 {
 187     SpiceChardev *s = SPICE_CHARDEV(chr);
 188     int read_bytes;
 189
 190     assert(s->datalen == 0);
 191
 192     if (!chr->be_open) {
 193         trace_spice_chr_discard_write(len);
 194         return len;
 195     }
 196
 197     s->datapos = buf;
 198     s->datalen = len;
 199     spice_server_char_device_wakeup(&s->sin);
 200     read_bytes = len - s->datalen;
 201     if (read_bytes != len) {
 202         /* We'll get passed in the unconsumed data with the next call */
 203         s->datalen = 0;
 204         s->datapos = NULL;
 205         s->blocked = true;
 206     }
 207     return read_bytes;
 208 }
 209
 210 static void char_spice_finalize(Object *obj)
 211 {
 212     SpiceChardev *s = SPICE_CHARDEV(obj);
 213
 214     vmc_unregister_interface(s);
 215
 216     g_free((char *)s->sin.subtype);
 217     g_free((char *)s->sin.portname);
 218 }
 219
 220 static void spice_vmc_set_fe_open(struct Chardev *chr, int fe_open)
 221 {
 222     SpiceChardev *s = SPICE_CHARDEV(chr);
 223     if (fe_open) {
 224         vmc_register_interface(s);
 225     } else {
 226         vmc_unregister_interface(s);
 227     }
 228 }
 229
 230 static void spice_port_set_fe_open(struct Chardev *chr, int fe_open)
 231 {
 232     SpiceChardev *s = SPICE_CHARDEV(chr);
 233
 234     if (fe_open) {
 235         spice_server_port_event(&s->sin, SPICE_PORT_EVENT_OPENED);
 236     } else {
 237         spice_server_port_event(&s->sin, SPICE_PORT_EVENT_CLOSED);
 238     }
 239 }
 240
 241 static void spice_chr_accept_input(struct Chardev *chr)
 242 {
 243     SpiceChardev *s = SPICE_CHARDEV(chr);
 244
 245     spice_server_char_device_wakeup(&s->sin);
 246 }
 247
 248 static void chr_open(Chardev *chr, const char *subtype)
 249 {
 250     SpiceChardev *s = SPICE_CHARDEV(chr);
 251
 252     s->active = false;
 253     s->sin.subtype = g_strdup(subtype);
 254 }
 255
 256 static void qemu_chr_open_spice_vmc(Chardev *chr,
 257                                     ChardevBackend *backend,
 258                                     bool *be_opened,
 259                                     Error **errp)
 260 {
 261     ChardevSpiceChannel *spicevmc = backend->u.spicevmc.data;
 262     const char *type = spicevmc->type;
 263     const char **psubtype = spice_server_char_device_recognized_subtypes();
 264
 265     for (; *psubtype != NULL; ++psubtype) {
 266         if (strcmp(type, *psubtype) == 0) {
 267             break;
 268         }
 269     }
 270     if (*psubtype == NULL) {
 271         char *subtypes = g_strjoinv(", ",
 272             (gchar **)spice_server_char_device_recognized_subtypes());
 273
 274         error_setg(errp, "unsupported type name: %s", type);
 275         error_append_hint(errp, "allowed spice char type names: %s\n",
 276                           subtypes);
 277
 278         g_free(subtypes);
 279         return;
 280     }
 281
 282     *be_opened = false;
 283 #if SPICE_SERVER_VERSION < 0x000e02
 284     /* Spice < 0.14.2 doesn't explicitly open smartcard chardev */
 285     if (strcmp(type, "smartcard") == 0) {
 286         *be_opened = true;
 287     }
 288 #endif
 289     chr_open(chr, type);
 290 }
 291
 292 static void qemu_chr_open_spice_port(Chardev *chr,
 293                                      ChardevBackend *backend,
 294                                      bool *be_opened,
 295                                      Error **errp)
 296 {
 297     ChardevSpicePort *spiceport = backend->u.spiceport.data;
 298     const char *name = spiceport->fqdn;
 299     SpiceChardev *s;
 300
 301     if (name == NULL) {
 302         error_setg(errp, "missing name parameter");
 303         return;
 304     }
 305
 306     if (!using_spice) {
 307         error_setg(errp, "spice not enabled");
 308         return;
 309     }
 310
 311     chr_open(chr, "port");
 312
 313     *be_opened = false;
 314     s = SPICE_CHARDEV(chr);
 315     s->sin.portname = g_strdup(name);
 316
 317     vmc_register_interface(s);
 318 }
 319
 320 static void qemu_chr_parse_spice_vmc(QemuOpts *opts, ChardevBackend *backend,
 321                                      Error **errp)
 322 {
 323     const char *name = qemu_opt_get(opts, "name");
 324     ChardevSpiceChannel *spicevmc;
 325
 326     if (name == NULL) {
 327         error_setg(errp, "chardev: spice channel: no name given");
 328         return;
 329     }
 330     backend->type = CHARDEV_BACKEND_KIND_SPICEVMC;
 331     spicevmc = backend->u.spicevmc.data = g_new0(ChardevSpiceChannel, 1);
 332     qemu_chr_parse_common(opts, qapi_ChardevSpiceChannel_base(spicevmc));
 333     spicevmc->type = g_strdup(name);
 334 }
 335
 336 static void qemu_chr_parse_spice_port(QemuOpts *opts, ChardevBackend *backend,
 337                                       Error **errp)
 338 {
 339     const char *name = qemu_opt_get(opts, "name");
 340     ChardevSpicePort *spiceport;
 341
 342     if (name == NULL) {
 343         error_setg(errp, "chardev: spice port: no name given");
 344         return;
 345     }
 346     backend->type = CHARDEV_BACKEND_KIND_SPICEPORT;
 347     spiceport = backend->u.spiceport.data = g_new0(ChardevSpicePort, 1);
 348     qemu_chr_parse_common(opts, qapi_ChardevSpicePort_base(spiceport));
 349     spiceport->fqdn = g_strdup(name);
 350 }
 351
 352 static void char_spice_class_init(ObjectClass *oc, void *data)
 353 {
 354     ChardevClass *cc = CHARDEV_CLASS(oc);
 355
 356     cc->chr_write = spice_chr_write;
 357     cc->chr_add_watch = spice_chr_add_watch;
 358     cc->chr_accept_input = spice_chr_accept_input;
 359 }
 360
 361 static const TypeInfo char_spice_type_info = {
 362     .name = TYPE_CHARDEV_SPICE,
 363     .parent = TYPE_CHARDEV,
 364     .instance_size = sizeof(SpiceChardev),
 365     .instance_finalize = char_spice_finalize,
 366     .class_init = char_spice_class_init,
 367     .abstract = true,
 368 };
 369
 370 static void char_spicevmc_class_init(ObjectClass *oc, void *data)
 371 {
 372     ChardevClass *cc = CHARDEV_CLASS(oc);
 373
 374     cc->parse = qemu_chr_parse_spice_vmc;
 375     cc->open = qemu_chr_open_spice_vmc;
 376     cc->chr_set_fe_open = spice_vmc_set_fe_open;
 377 }
 378
 379 static const TypeInfo char_spicevmc_type_info = {
 380     .name = TYPE_CHARDEV_SPICEVMC,
 381     .parent = TYPE_CHARDEV_SPICE,
 382     .class_init = char_spicevmc_class_init,
 383 };
 384
 385 static void char_spiceport_class_init(ObjectClass *oc, void *data)
 386 {
 387     ChardevClass *cc = CHARDEV_CLASS(oc);
 388
 389     cc->parse = qemu_chr_parse_spice_port;
 390     cc->open = qemu_chr_open_spice_port;
 391     cc->chr_set_fe_open = spice_port_set_fe_open;
 392 }
 393
 394 static const TypeInfo char_spiceport_type_info = {
 395     .name = TYPE_CHARDEV_SPICEPORT,
 396     .parent = TYPE_CHARDEV_SPICE,
 397     .class_init = char_spiceport_class_init,
 398 };
 399
 400 static void register_types(void)
 401 {
 402     type_register_static(&char_spice_type_info);
 403     type_register_static(&char_spicevmc_type_info);
 404     type_register_static(&char_spiceport_type_info);
 405 }
 406
 407 type_init(register_types);