spice-qemu-char.c

   1 #include "config-host.h"
   2 #include "trace.h"
   3 #include "ui/qemu-spice.h"
   4 #include "char/char.h"
   5 #include <spice.h>
   6 #include <spice-experimental.h>
   7 #include <spice/protocol.h>
   8
   9 #include "qemu/osdep.h"
  10
  11 typedef struct SpiceCharDriver {
  12     CharDriverState*      chr;
  13     SpiceCharDeviceInstance     sin;
  14     char                  *subtype;
  15     bool                  active;
  16     uint8_t               *buffer;
  17     uint8_t               *datapos;
  18     ssize_t               bufsize, datalen;
  19     QLIST_ENTRY(SpiceCharDriver) next;
  20 } SpiceCharDriver;
  21
  22 static QLIST_HEAD(, SpiceCharDriver) spice_chars =
  23     QLIST_HEAD_INITIALIZER(spice_chars);
  24
  25 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
  26 {
  27     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  28     ssize_t out = 0;
  29     ssize_t last_out;
  30     uint8_t* p = (uint8_t*)buf;
  31
  32     while (len > 0) {
  33         last_out = MIN(len, qemu_chr_be_can_write(scd->chr));
  34         if (last_out <= 0) {
  35             break;
  36         }
  37         qemu_chr_be_write(scd->chr, p, last_out);
  38         out += last_out;
  39         len -= last_out;
  40         p += last_out;
  41     }
  42
  43     trace_spice_vmc_write(out, len + out);
  44     return out;
  45 }
  46
  47 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
  48 {
  49     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  50     int bytes = MIN(len, scd->datalen);
  51
  52     if (bytes > 0) {
  53         memcpy(buf, scd->datapos, bytes);
  54         scd->datapos += bytes;
  55         scd->datalen -= bytes;
  56         assert(scd->datalen >= 0);
  57         if (scd->datalen == 0) {
  58             scd->datapos = 0;
  59         }
  60     }
  61     trace_spice_vmc_read(bytes, len);
  62     return bytes;
  63 }
  64
  65 #if SPICE_SERVER_VERSION >= 0x000c02
  66 static void vmc_event(SpiceCharDeviceInstance *sin, uint8_t event)
  67 {
  68     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  69     int chr_event;
  70
  71     switch (event) {
  72     case SPICE_PORT_EVENT_BREAK:
  73         chr_event = CHR_EVENT_BREAK;
  74         break;
  75     default:
  76         return;
  77     }
  78
  79     trace_spice_vmc_event(chr_event);
  80     qemu_chr_be_event(scd->chr, chr_event);
  81 }
  82 #endif
  83
  84 static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
  85 {
  86     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  87
  88 #if SPICE_SERVER_VERSION < 0x000901
  89     /*
  90      * spice-server calls the state callback for the agent channel when the
  91      * spice client connects / disconnects. Given that not the client but
  92      * the server is doing the parsing of the messages this is wrong as the
  93      * server is still listening. Worse, this causes the parser in the server
  94      * to go out of sync, so we ignore state calls for subtype vdagent
  95      * spicevmc chardevs. For the full story see:
  96      * http://lists.freedesktop.org/archives/spice-devel/2011-July/004837.html
  97      */
  98     if (strcmp(sin->subtype, "vdagent") == 0) {
  99         return;
 100     }
 101 #endif
 102
 103     if ((scd->chr->opened && connected) ||
 104         (!scd->chr->opened && !connected)) {
 105         return;
 106     }
 107
 108     qemu_chr_be_event(scd->chr,
 109                       connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
 110 }
 111
 112 static SpiceCharDeviceInterface vmc_interface = {
 113     .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
 114     .base.description   = "spice virtual channel char device",
 115     .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
 116     .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
 117     .state              = vmc_state,
 118     .write              = vmc_write,
 119     .read               = vmc_read,
 120 #if SPICE_SERVER_VERSION >= 0x000c02
 121     .event              = vmc_event,
 122 #endif
 123 };
 124
 125
 126 static void vmc_register_interface(SpiceCharDriver *scd)
 127 {
 128     if (scd->active) {
 129         return;
 130     }
 131     scd->sin.base.sif = &vmc_interface.base;
 132     qemu_spice_add_interface(&scd->sin.base);
 133     scd->active = true;
 134     trace_spice_vmc_register_interface(scd);
 135 }
 136
 137 static void vmc_unregister_interface(SpiceCharDriver *scd)
 138 {
 139     if (!scd->active) {
 140         return;
 141     }
 142     spice_server_remove_interface(&scd->sin.base);
 143     scd->active = false;
 144     trace_spice_vmc_unregister_interface(scd);
 145 }
 146
 147
 148 static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
 149 {
 150     SpiceCharDriver *s = chr->opaque;
 151
 152     vmc_register_interface(s);
 153     assert(s->datalen == 0);
 154     if (s->bufsize < len) {
 155         s->bufsize = len;
 156         s->buffer = g_realloc(s->buffer, s->bufsize);
 157     }
 158     memcpy(s->buffer, buf, len);
 159     s->datapos = s->buffer;
 160     s->datalen = len;
 161     spice_server_char_device_wakeup(&s->sin);
 162     return len;
 163 }
 164
 165 static void spice_chr_close(struct CharDriverState *chr)
 166 {
 167     SpiceCharDriver *s = chr->opaque;
 168
 169     vmc_unregister_interface(s);
 170     QLIST_REMOVE(s, next);
 171
 172     g_free((char *)s->sin.subtype);
 173 #if SPICE_SERVER_VERSION >= 0x000c02
 174     g_free((char *)s->sin.portname);
 175 #endif
 176     g_free(s);
 177 }
 178
 179 static void spice_chr_guest_open(struct CharDriverState *chr)
 180 {
 181     SpiceCharDriver *s = chr->opaque;
 182     vmc_register_interface(s);
 183 }
 184
 185 static void spice_chr_guest_close(struct CharDriverState *chr)
 186 {
 187     SpiceCharDriver *s = chr->opaque;
 188     vmc_unregister_interface(s);
 189 }
 190
 191 static void print_allowed_subtypes(void)
 192 {
 193     const char** psubtype;
 194     int i;
 195
 196     fprintf(stderr, "allowed names: ");
 197     for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
 198         *psubtype != NULL; ++psubtype, ++i) {
 199         if (i == 0) {
 200             fprintf(stderr, "%s", *psubtype);
 201         } else {
 202             fprintf(stderr, ", %s", *psubtype);
 203         }
 204     }
 205     fprintf(stderr, "\n");
 206 }
 207
 208 static CharDriverState *chr_open(const char *subtype)
 209 {
 210     CharDriverState *chr;
 211     SpiceCharDriver *s;
 212
 213     chr = g_malloc0(sizeof(CharDriverState));
 214     s = g_malloc0(sizeof(SpiceCharDriver));
 215     s->chr = chr;
 216     s->active = false;
 217     s->sin.subtype = g_strdup(subtype);
 218     chr->opaque = s;
 219     chr->chr_write = spice_chr_write;
 220     chr->chr_close = spice_chr_close;
 221     chr->chr_guest_open = spice_chr_guest_open;
 222     chr->chr_guest_close = spice_chr_guest_close;
 223
 224     QLIST_INSERT_HEAD(&spice_chars, s, next);
 225
 226     return chr;
 227 }
 228
 229 CharDriverState *qemu_chr_open_spice_vmc(const char *type)
 230 {
 231     CharDriverState *chr;
 232     const char **psubtype = spice_server_char_device_recognized_subtypes();
 233
 234     if (type == NULL) {
 235         fprintf(stderr, "spice-qemu-char: missing name parameter\n");
 236         print_allowed_subtypes();
 237         return NULL;
 238     }
 239     for (; *psubtype != NULL; ++psubtype) {
 240         if (strcmp(type, *psubtype) == 0) {
 241             break;
 242         }
 243     }
 244     if (*psubtype == NULL) {
 245         fprintf(stderr, "spice-qemu-char: unsupported type: %s\n", type);
 246         print_allowed_subtypes();
 247         return NULL;
 248     }
 249
 250     chr = chr_open(type);
 251
 252 #if SPICE_SERVER_VERSION < 0x000901
 253     /* See comment in vmc_state() */
 254     if (strcmp(type, "vdagent") == 0) {
 255         qemu_chr_generic_open(chr);
 256     }
 257 #endif
 258
 259     return chr;
 260 }
 261
 262 #if SPICE_SERVER_VERSION >= 0x000c02
 263 CharDriverState *qemu_chr_open_spice_port(const char *name)
 264 {
 265     CharDriverState *chr;
 266     SpiceCharDriver *s;
 267
 268     if (name == NULL) {
 269         fprintf(stderr, "spice-qemu-char: missing name parameter\n");
 270         return NULL;
 271     }
 272
 273     chr = chr_open("port");
 274     s = chr->opaque;
 275     s->sin.portname = g_strdup(name);
 276
 277     return chr;
 278 }
 279
 280 void qemu_spice_register_ports(void)
 281 {
 282     SpiceCharDriver *s;
 283
 284     QLIST_FOREACH(s, &spice_chars, next) {
 285         if (s->sin.portname == NULL) {
 286             continue;
 287         }
 288         vmc_register_interface(s);
 289     }
 290 }
 291 #endif
 292
 293 static void qemu_chr_parse_spice_vmc(QemuOpts *opts, ChardevBackend *backend,
 294                                      Error **errp)
 295 {
 296     const char *name = qemu_opt_get(opts, "name");
 297
 298     if (name == NULL) {
 299         error_setg(errp, "chardev: spice channel: no name given");
 300         return;
 301     }
 302     backend->spicevmc = g_new0(ChardevSpiceChannel, 1);
 303     backend->spicevmc->type = g_strdup(name);
 304 }
 305
 306 static void qemu_chr_parse_spice_port(QemuOpts *opts, ChardevBackend *backend,
 307                                       Error **errp)
 308 {
 309     const char *name = qemu_opt_get(opts, "name");
 310
 311     if (name == NULL) {
 312         error_setg(errp, "chardev: spice port: no name given");
 313         return;
 314     }
 315     backend->spiceport = g_new0(ChardevSpicePort, 1);
 316     backend->spiceport->fqdn = g_strdup(name);
 317 }
 318
 319 static void register_types(void)
 320 {
 321     register_char_driver_qapi("spicevmc", CHARDEV_BACKEND_KIND_SPICEVMC,
 322                               qemu_chr_parse_spice_vmc);
 323     register_char_driver_qapi("spiceport", CHARDEV_BACKEND_KIND_SPICEPORT,
 324                               qemu_chr_parse_spice_port);
 325 }
 326
 327 type_init(register_types);