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->be_open && connected) ||
 104         (!scd->chr->be_open && !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_set_fe_open(struct CharDriverState *chr, int fe_open)
 180 {
 181     SpiceCharDriver *s = chr->opaque;
 182     if (fe_open) {
 183         vmc_register_interface(s);
 184     } else {
 185         vmc_unregister_interface(s);
 186     }
 187 }
 188
 189 static void print_allowed_subtypes(void)
 190 {
 191     const char** psubtype;
 192     int i;
 193
 194     fprintf(stderr, "allowed names: ");
 195     for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
 196         *psubtype != NULL; ++psubtype, ++i) {
 197         if (i == 0) {
 198             fprintf(stderr, "%s", *psubtype);
 199         } else {
 200             fprintf(stderr, ", %s", *psubtype);
 201         }
 202     }
 203     fprintf(stderr, "\n");
 204 }
 205
 206 static CharDriverState *chr_open(const char *subtype)
 207 {
 208     CharDriverState *chr;
 209     SpiceCharDriver *s;
 210
 211     chr = g_malloc0(sizeof(CharDriverState));
 212     s = g_malloc0(sizeof(SpiceCharDriver));
 213     s->chr = chr;
 214     s->active = false;
 215     s->sin.subtype = g_strdup(subtype);
 216     chr->opaque = s;
 217     chr->chr_write = spice_chr_write;
 218     chr->chr_close = spice_chr_close;
 219     chr->chr_set_fe_open = spice_chr_set_fe_open;
 220
 221     QLIST_INSERT_HEAD(&spice_chars, s, next);
 222
 223     return chr;
 224 }
 225
 226 CharDriverState *qemu_chr_open_spice_vmc(const char *type)
 227 {
 228     CharDriverState *chr;
 229     const char **psubtype = spice_server_char_device_recognized_subtypes();
 230
 231     if (type == NULL) {
 232         fprintf(stderr, "spice-qemu-char: missing name parameter\n");
 233         print_allowed_subtypes();
 234         return NULL;
 235     }
 236     for (; *psubtype != NULL; ++psubtype) {
 237         if (strcmp(type, *psubtype) == 0) {
 238             break;
 239         }
 240     }
 241     if (*psubtype == NULL) {
 242         fprintf(stderr, "spice-qemu-char: unsupported type: %s\n", type);
 243         print_allowed_subtypes();
 244         return NULL;
 245     }
 246
 247     chr = chr_open(type);
 248
 249 #if SPICE_SERVER_VERSION < 0x000901
 250     /* See comment in vmc_state() */
 251     if (strcmp(type, "vdagent") == 0) {
 252         qemu_chr_generic_open(chr);
 253     }
 254 #endif
 255
 256     return chr;
 257 }
 258
 259 #if SPICE_SERVER_VERSION >= 0x000c02
 260 CharDriverState *qemu_chr_open_spice_port(const char *name)
 261 {
 262     CharDriverState *chr;
 263     SpiceCharDriver *s;
 264
 265     if (name == NULL) {
 266         fprintf(stderr, "spice-qemu-char: missing name parameter\n");
 267         return NULL;
 268     }
 269
 270     chr = chr_open("port");
 271     s = chr->opaque;
 272     s->sin.portname = g_strdup(name);
 273
 274     return chr;
 275 }
 276
 277 void qemu_spice_register_ports(void)
 278 {
 279     SpiceCharDriver *s;
 280
 281     QLIST_FOREACH(s, &spice_chars, next) {
 282         if (s->sin.portname == NULL) {
 283             continue;
 284         }
 285         vmc_register_interface(s);
 286     }
 287 }
 288 #endif
 289
 290 static void qemu_chr_parse_spice_vmc(QemuOpts *opts, ChardevBackend *backend,
 291                                      Error **errp)
 292 {
 293     const char *name = qemu_opt_get(opts, "name");
 294
 295     if (name == NULL) {
 296         error_setg(errp, "chardev: spice channel: no name given");
 297         return;
 298     }
 299     backend->spicevmc = g_new0(ChardevSpiceChannel, 1);
 300     backend->spicevmc->type = g_strdup(name);
 301 }
 302
 303 static void qemu_chr_parse_spice_port(QemuOpts *opts, ChardevBackend *backend,
 304                                       Error **errp)
 305 {
 306     const char *name = qemu_opt_get(opts, "name");
 307
 308     if (name == NULL) {
 309         error_setg(errp, "chardev: spice port: no name given");
 310         return;
 311     }
 312     backend->spiceport = g_new0(ChardevSpicePort, 1);
 313     backend->spiceport->fqdn = g_strdup(name);
 314 }
 315
 316 static void register_types(void)
 317 {
 318     register_char_driver_qapi("spicevmc", CHARDEV_BACKEND_KIND_SPICEVMC,
 319                               qemu_chr_parse_spice_vmc);
 320     register_char_driver_qapi("spiceport", CHARDEV_BACKEND_KIND_SPICEPORT,
 321                               qemu_chr_parse_spice_port);
 322 }
 323
 324 type_init(register_types);