spice-qemu-char.c

   1 #include "config-host.h"
   2 #include "trace.h"
   3 #include "ui/qemu-spice.h"
   4 #include <spice.h>
   5 #include <spice-experimental.h>
   6 #include <spice/protocol.h>
   7
   8 #include "osdep.h"
   9
  10 #define dprintf(_scd, _level, _fmt, ...)                                \
  11     do {                                                                \
  12         static unsigned __dprintf_counter = 0;                          \
  13         if (_scd->debug >= _level) {                                    \
  14             fprintf(stderr, "scd: %3d: " _fmt, ++__dprintf_counter, ## __VA_ARGS__);\
  15         }                                                               \
  16     } while (0)
  17
  18 typedef struct SpiceCharDriver {
  19     CharDriverState*      chr;
  20     SpiceCharDeviceInstance     sin;
  21     char                  *subtype;
  22     bool                  active;
  23     uint8_t               *buffer;
  24     uint8_t               *datapos;
  25     ssize_t               bufsize, datalen;
  26     uint32_t              debug;
  27     QLIST_ENTRY(SpiceCharDriver) next;
  28 } SpiceCharDriver;
  29
  30 static QLIST_HEAD(, SpiceCharDriver) spice_chars =
  31     QLIST_HEAD_INITIALIZER(spice_chars);
  32
  33 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
  34 {
  35     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  36     ssize_t out = 0;
  37     ssize_t last_out;
  38     uint8_t* p = (uint8_t*)buf;
  39
  40     while (len > 0) {
  41         last_out = MIN(len, qemu_chr_be_can_write(scd->chr));
  42         if (last_out <= 0) {
  43             break;
  44         }
  45         qemu_chr_be_write(scd->chr, p, last_out);
  46         out += last_out;
  47         len -= last_out;
  48         p += last_out;
  49     }
  50
  51     dprintf(scd, 3, "%s: %zu/%zd\n", __func__, out, len + out);
  52     trace_spice_vmc_write(out, len + out);
  53     return out;
  54 }
  55
  56 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
  57 {
  58     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  59     int bytes = MIN(len, scd->datalen);
  60
  61     dprintf(scd, 2, "%s: %p %d/%d/%zd\n", __func__, scd->datapos, len, bytes, scd->datalen);
  62     if (bytes > 0) {
  63         memcpy(buf, scd->datapos, bytes);
  64         scd->datapos += bytes;
  65         scd->datalen -= bytes;
  66         assert(scd->datalen >= 0);
  67         if (scd->datalen == 0) {
  68             scd->datapos = 0;
  69         }
  70     }
  71     trace_spice_vmc_read(bytes, len);
  72     return bytes;
  73 }
  74
  75 #if SPICE_SERVER_VERSION >= 0x000c02
  76 static void vmc_event(SpiceCharDeviceInstance *sin, uint8_t event)
  77 {
  78     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  79     int chr_event;
  80
  81     switch (event) {
  82     case SPICE_PORT_EVENT_BREAK:
  83         chr_event = CHR_EVENT_BREAK;
  84         break;
  85     default:
  86         dprintf(scd, 2, "%s: unknown %d\n", __func__, event);
  87         return;
  88     }
  89
  90     dprintf(scd, 2, "%s: %d\n", __func__, event);
  91     trace_spice_vmc_event(chr_event);
  92     qemu_chr_be_event(scd->chr, chr_event);
  93 }
  94 #endif
  95
  96 static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
  97 {
  98     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  99
 100 #if SPICE_SERVER_VERSION < 0x000901
 101     /*
 102      * spice-server calls the state callback for the agent channel when the
 103      * spice client connects / disconnects. Given that not the client but
 104      * the server is doing the parsing of the messages this is wrong as the
 105      * server is still listening. Worse, this causes the parser in the server
 106      * to go out of sync, so we ignore state calls for subtype vdagent
 107      * spicevmc chardevs. For the full story see:
 108      * http://lists.freedesktop.org/archives/spice-devel/2011-July/004837.html
 109      */
 110     if (strcmp(sin->subtype, "vdagent") == 0) {
 111         return;
 112     }
 113 #endif
 114
 115     if ((scd->chr->opened && connected) ||
 116         (!scd->chr->opened && !connected)) {
 117         return;
 118     }
 119
 120     qemu_chr_be_event(scd->chr,
 121                       connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
 122 }
 123
 124 static SpiceCharDeviceInterface vmc_interface = {
 125     .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
 126     .base.description   = "spice virtual channel char device",
 127     .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
 128     .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
 129     .state              = vmc_state,
 130     .write              = vmc_write,
 131     .read               = vmc_read,
 132 #if SPICE_SERVER_VERSION >= 0x000c02
 133     .event              = vmc_event,
 134 #endif
 135 };
 136
 137
 138 static void vmc_register_interface(SpiceCharDriver *scd)
 139 {
 140     if (scd->active) {
 141         return;
 142     }
 143     dprintf(scd, 1, "%s\n", __func__);
 144     scd->sin.base.sif = &vmc_interface.base;
 145     qemu_spice_add_interface(&scd->sin.base);
 146     scd->active = true;
 147     trace_spice_vmc_register_interface(scd);
 148 }
 149
 150 static void vmc_unregister_interface(SpiceCharDriver *scd)
 151 {
 152     if (!scd->active) {
 153         return;
 154     }
 155     dprintf(scd, 1, "%s\n", __func__);
 156     spice_server_remove_interface(&scd->sin.base);
 157     scd->active = false;
 158     trace_spice_vmc_unregister_interface(scd);
 159 }
 160
 161
 162 static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
 163 {
 164     SpiceCharDriver *s = chr->opaque;
 165
 166     dprintf(s, 2, "%s: %d\n", __func__, len);
 167     vmc_register_interface(s);
 168     assert(s->datalen == 0);
 169     if (s->bufsize < len) {
 170         s->bufsize = len;
 171         s->buffer = g_realloc(s->buffer, s->bufsize);
 172     }
 173     memcpy(s->buffer, buf, len);
 174     s->datapos = s->buffer;
 175     s->datalen = len;
 176     spice_server_char_device_wakeup(&s->sin);
 177     return len;
 178 }
 179
 180 static void spice_chr_close(struct CharDriverState *chr)
 181 {
 182     SpiceCharDriver *s = chr->opaque;
 183
 184     printf("%s\n", __func__);
 185     vmc_unregister_interface(s);
 186     QLIST_REMOVE(s, next);
 187     g_free(s);
 188 }
 189
 190 static void spice_chr_guest_open(struct CharDriverState *chr)
 191 {
 192     SpiceCharDriver *s = chr->opaque;
 193     vmc_register_interface(s);
 194 }
 195
 196 static void spice_chr_guest_close(struct CharDriverState *chr)
 197 {
 198     SpiceCharDriver *s = chr->opaque;
 199     vmc_unregister_interface(s);
 200 }
 201
 202 static void print_allowed_subtypes(void)
 203 {
 204     const char** psubtype;
 205     int i;
 206
 207     fprintf(stderr, "allowed names: ");
 208     for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
 209         *psubtype != NULL; ++psubtype, ++i) {
 210         if (i == 0) {
 211             fprintf(stderr, "%s", *psubtype);
 212         } else {
 213             fprintf(stderr, ", %s", *psubtype);
 214         }
 215     }
 216     fprintf(stderr, "\n");
 217 }
 218
 219 static CharDriverState *chr_open(QemuOpts *opts, const char *subtype)
 220 {
 221     CharDriverState *chr;
 222     SpiceCharDriver *s;
 223     uint32_t debug = qemu_opt_get_number(opts, "debug", 0);
 224
 225     chr = g_malloc0(sizeof(CharDriverState));
 226     s = g_malloc0(sizeof(SpiceCharDriver));
 227     s->chr = chr;
 228     s->debug = debug;
 229     s->active = false;
 230     s->sin.subtype = subtype;
 231     chr->opaque = s;
 232     chr->chr_write = spice_chr_write;
 233     chr->chr_close = spice_chr_close;
 234     chr->chr_guest_open = spice_chr_guest_open;
 235     chr->chr_guest_close = spice_chr_guest_close;
 236
 237     QLIST_INSERT_HEAD(&spice_chars, s, next);
 238
 239     return chr;
 240 }
 241
 242 CharDriverState *qemu_chr_open_spice(QemuOpts *opts)
 243 {
 244     CharDriverState *chr;
 245     const char *name = qemu_opt_get(opts, "name");
 246     const char **psubtype = spice_server_char_device_recognized_subtypes();
 247     const char *subtype = NULL;
 248
 249     if (name == NULL) {
 250         fprintf(stderr, "spice-qemu-char: missing name parameter\n");
 251         print_allowed_subtypes();
 252         return NULL;
 253     }
 254     for(;*psubtype != NULL; ++psubtype) {
 255         if (strcmp(name, *psubtype) == 0) {
 256             subtype = *psubtype;
 257             break;
 258         }
 259     }
 260     if (subtype == NULL) {
 261         fprintf(stderr, "spice-qemu-char: unsupported name: %s\n", name);
 262         print_allowed_subtypes();
 263         return NULL;
 264     }
 265
 266     chr = chr_open(opts, subtype);
 267
 268 #if SPICE_SERVER_VERSION < 0x000901
 269     /* See comment in vmc_state() */
 270     if (strcmp(subtype, "vdagent") == 0) {
 271         qemu_chr_generic_open(chr);
 272     }
 273 #endif
 274
 275     return chr;
 276 }
 277
 278 #if SPICE_SERVER_VERSION >= 0x000c02
 279 CharDriverState *qemu_chr_open_spice_port(QemuOpts *opts)
 280 {
 281     CharDriverState *chr;
 282     SpiceCharDriver *s;
 283     const char *name = qemu_opt_get(opts, "name");
 284
 285     if (name == NULL) {
 286         fprintf(stderr, "spice-qemu-char: missing name parameter\n");
 287         return NULL;
 288     }
 289
 290     chr = chr_open(opts, "port");
 291     s = chr->opaque;
 292     s->sin.portname = name;
 293
 294     return chr;
 295 }
 296 #endif