[Qemu-devel] [PATCH 00/10] vnc: add support for multiple vnc displays

[Qemu-devel] [PATCH 00/10] vnc: add support for multiple vnc displays

[Gerd Hoffmann]

  Hi,

Next (and hopefully final) round of the multiple vnc display
patch series.  Renamed the monitor command from query-vnc2 to
query-vnc-servers as suggested by Markus.

please review,
  Gerd

Gerd Hoffmann (10):
  vnc: remove vnc_display global
  vnc: remove unused DisplayState parameter, add id instead.
  vnc: add display id to acl names
  vnc: switch to QemuOpts, allow multiple servers
  vnc: allow binding servers to qemu consoles
  vnc: update docs/multiseat.txt
  vnc: track & limit connections
  vnc: factor out qmp_query_client_list
  monitor: add query-vnc-servers command
  monitor: add vnc websockets

 docs/multiseat.txt   |  18 +-
 include/ui/console.h |  18 +-
 qapi-schema.json     |  73 +++++-
 qmp-commands.hx      |   5 +
 qmp.c                |  15 +-
 ui/vnc.c             | 634 ++++++++++++++++++++++++++++++++++++++-------------
 ui/vnc.h             |   5 +
 vl.c                 |  41 ++--
 8 files changed, 611 insertions(+), 198 deletions(-)

-- 
1.8.3.1

[Qemu-devel] [PATCH 01/10] vnc: remove vnc_display global

[Gerd Hoffmann]

Replace with a vnc_displays list, so we can have multiple vnc server
instances.  Add vnc_server_find function to lookup a display by id.
With no id supplied return the first vnc server, for backward
compatibility reasons.

It is not possible (yet) to actually create multiple vnc server
instances.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
---
 ui/vnc.c | 63 +++++++++++++++++++++++++++++++++++++++++----------------------
 ui/vnc.h |  2 ++
 2 files changed, 43 insertions(+), 22 deletions(-)

diff --git a/ui/vnc.c b/ui/vnc.c
index 5707015..a6549c8 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -46,7 +46,8 @@ static const struct timeval VNC_REFRESH_LOSSY = { 2, 0 };
 #include "vnc_keysym.h"
 #include "d3des.h"
 
-static VncDisplay *vnc_display; /* needed for info vnc */
+static QTAILQ_HEAD(, VncDisplay) vnc_displays =
+    QTAILQ_HEAD_INITIALIZER(vnc_displays);
 
 static int vnc_cursor_define(VncState *vs);
 static void vnc_release_modifiers(VncState *vs);
@@ -226,10 +227,10 @@ static const char *vnc_auth_name(VncDisplay *vd) {
     return "unknown";
 }
 
-static VncServerInfo *vnc_server_info_get(void)
+static VncServerInfo *vnc_server_info_get(VncDisplay *vd)
 {
     VncServerInfo *info;
-    VncBasicInfo *bi = vnc_basic_info_get_from_server_addr(vnc_display->lsock);
+    VncBasicInfo *bi = vnc_basic_info_get_from_server_addr(vd->lsock);
     if (!bi) {
         return NULL;
     }
@@ -237,7 +238,7 @@ static VncServerInfo *vnc_server_info_get(void)
     info = g_malloc(sizeof(*info));
     info->base = bi;
     info->has_auth = true;
-    info->auth = g_strdup(vnc_auth_name(vnc_display));
+    info->auth = g_strdup(vnc_auth_name(vd));
     return info;
 }
 
@@ -282,7 +283,7 @@ static void vnc_qmp_event(VncState *vs, QAPIEvent event)
     }
     g_assert(vs->info->base);
 
-    si = vnc_server_info_get();
+    si = vnc_server_info_get(vs->vd);
     if (!si) {
         return;
     }
@@ -345,11 +346,27 @@ static VncClientInfo *qmp_query_vnc_client(const VncState *client)
     return info;
 }
 
+static VncDisplay *vnc_display_find(const char *id)
+{
+    VncDisplay *vd;
+
+    if (id == NULL) {
+        return QTAILQ_FIRST(&vnc_displays);
+    }
+    QTAILQ_FOREACH(vd, &vnc_displays, next) {
+        if (strcmp(id, vd->id) == 0) {
+            return vd;
+        }
+    }
+    return NULL;
+}
+
 VncInfo *qmp_query_vnc(Error **errp)
 {
     VncInfo *info = g_malloc0(sizeof(*info));
+    VncDisplay *vd = vnc_display_find(NULL);
 
-    if (vnc_display == NULL || vnc_display->display == NULL) {
+    if (vd == NULL || vd->display == NULL) {
         info->enabled = false;
     } else {
         VncClientInfoList *cur_item = NULL;
@@ -364,7 +381,7 @@ VncInfo *qmp_query_vnc(Error **errp)
         /* for compatibility with the original command */
         info->has_clients = true;
 
-        QTAILQ_FOREACH(client, &vnc_display->clients, next) {
+        QTAILQ_FOREACH(client, &vd->clients, next) {
             VncClientInfoList *cinfo = g_malloc0(sizeof(*info));
             cinfo->value = qmp_query_vnc_client(client);
 
@@ -377,11 +394,11 @@ VncInfo *qmp_query_vnc(Error **errp)
             }
         }
 
-        if (vnc_display->lsock == -1) {
+        if (vd->lsock == -1) {
             return info;
         }
 
-        if (getsockname(vnc_display->lsock, (struct sockaddr *)&sa,
+        if (getsockname(vd->lsock, (struct sockaddr *)&sa,
                         &salen) == -1) {
             error_set(errp, QERR_UNDEFINED_ERROR);
             goto out_error;
@@ -405,7 +422,7 @@ VncInfo *qmp_query_vnc(Error **errp)
         info->family = inet_netfamily(sa.ss_family);
 
         info->has_auth = true;
-        info->auth = g_strdup(vnc_auth_name(vnc_display));
+        info->auth = g_strdup(vnc_auth_name(vd));
     }
 
     return info;
@@ -853,7 +870,7 @@ static int vnc_cursor_define(VncState *vs)
 static void vnc_dpy_cursor_define(DisplayChangeListener *dcl,
                                   QEMUCursor *c)
 {
-    VncDisplay *vd = vnc_display;
+    VncDisplay *vd = container_of(dcl, VncDisplay, dcl);
     VncState *vs;
 
     cursor_put(vd->cursor);
@@ -2818,6 +2835,7 @@ static void vnc_connect(VncDisplay *vd, int csock,
     int i;
 
     vs->csock = csock;
+    vs->vd = vd;
 
     if (skipauth) {
 	vs->auth = VNC_AUTH_NONE;
@@ -2862,8 +2880,6 @@ static void vnc_connect(VncDisplay *vd, int csock,
     vnc_qmp_event(vs, QAPI_EVENT_VNC_CONNECTED);
     vnc_set_share_mode(vs, VNC_SHARE_MODE_CONNECTING);
 
-    vs->vd = vd;
-
 #ifdef CONFIG_VNC_WS
     if (!vs->websocket)
 #endif
@@ -2955,7 +2971,7 @@ void vnc_display_init(DisplayState *ds)
 {
     VncDisplay *vs = g_malloc0(sizeof(*vs));
 
-    vnc_display = vs;
+    QTAILQ_INSERT_TAIL(&vnc_displays, vs, next);
 
     vs->lsock = -1;
 #ifdef CONFIG_VNC_WS
@@ -2985,7 +3001,7 @@ void vnc_display_init(DisplayState *ds)
 
 static void vnc_display_close(DisplayState *ds)
 {
-    VncDisplay *vs = vnc_display;
+    VncDisplay *vs = vnc_display_find(NULL);
 
     if (!vs)
         return;
@@ -3014,7 +3030,7 @@ static void vnc_display_close(DisplayState *ds)
 
 int vnc_display_password(DisplayState *ds, const char *password)
 {
-    VncDisplay *vs = vnc_display;
+    VncDisplay *vs = vnc_display_find(NULL);
 
     if (!vs) {
         return -EINVAL;
@@ -3033,7 +3049,7 @@ int vnc_display_password(DisplayState *ds, const char *password)
 
 int vnc_display_pw_expire(DisplayState *ds, time_t expires)
 {
-    VncDisplay *vs = vnc_display;
+    VncDisplay *vs = vnc_display_find(NULL);
 
     if (!vs) {
         return -EINVAL;
@@ -3045,14 +3061,14 @@ int vnc_display_pw_expire(DisplayState *ds, time_t expires)
 
 char *vnc_display_local_addr(DisplayState *ds)
 {
-    VncDisplay *vs = vnc_display;
-    
+    VncDisplay *vs = vnc_display_find(NULL);
+
     return vnc_socket_local_addr("%s:%s", vs->lsock);
 }
 
 void vnc_display_open(DisplayState *ds, const char *display, Error **errp)
 {
-    VncDisplay *vs = vnc_display;
+    VncDisplay *vs = vnc_display_find(NULL);
     const char *options;
     int password = 0;
     int reverse = 0;
@@ -3068,7 +3084,7 @@ void vnc_display_open(DisplayState *ds, const char *display, Error **errp)
 #endif
     int lock_key_sync = 1;
 
-    if (!vnc_display) {
+    if (!vs) {
         error_setg(errp, "VNC display not active");
         return;
     }
@@ -3367,7 +3383,10 @@ fail:
 
 void vnc_display_add_client(DisplayState *ds, int csock, bool skipauth)
 {
-    VncDisplay *vs = vnc_display;
+    VncDisplay *vs = vnc_display_find(NULL);
 
+    if (!vs) {
+        return;
+    }
     vnc_connect(vs, csock, skipauth, false);
 }
diff --git a/ui/vnc.h b/ui/vnc.h
index 334de9d..6fe8278 100644
--- a/ui/vnc.h
+++ b/ui/vnc.h
@@ -171,6 +171,8 @@ struct VncDisplay
     struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
     pixman_image_t *server;    /* vnc server surface */
 
+    const char *id;
+    QTAILQ_ENTRY(VncDisplay) next;
     char *display;
     char *password;
     time_t expires;
-- 
1.8.3.1

[Qemu-devel] [PATCH 02/10] vnc: remove unused DisplayState parameter, add id instead.

[Gerd Hoffmann]

DisplayState isn't used anywhere, drop it.  Add the vnc server ID as
parameter instead, so it is possible to specify the server instance.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
---
 include/ui/console.h | 16 ++++++++--------
 ui/vnc.c             | 29 ++++++++++++++---------------
 vl.c                 |  7 ++++---
 3 files changed, 26 insertions(+), 26 deletions(-)

diff --git a/include/ui/console.h b/include/ui/console.h
index 22ef8ca..5ff2e27 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -327,19 +327,19 @@ void sdl_display_init(DisplayState *ds, int full_screen, int no_frame);
 void cocoa_display_init(DisplayState *ds, int full_screen);
 
 /* vnc.c */
-void vnc_display_init(DisplayState *ds);
-void vnc_display_open(DisplayState *ds, const char *display, Error **errp);
-void vnc_display_add_client(DisplayState *ds, int csock, bool skipauth);
-char *vnc_display_local_addr(DisplayState *ds);
+void vnc_display_init(const char *id);
+void vnc_display_open(const char *id, const char *display, Error **errp);
+void vnc_display_add_client(const char *id, int csock, bool skipauth);
+char *vnc_display_local_addr(const char *id);
 #ifdef CONFIG_VNC
-int vnc_display_password(DisplayState *ds, const char *password);
-int vnc_display_pw_expire(DisplayState *ds, time_t expires);
+int vnc_display_password(const char *id, const char *password);
+int vnc_display_pw_expire(const char *id, time_t expires);
 #else
-static inline int vnc_display_password(DisplayState *ds, const char *password)
+static inline int vnc_display_password(const char *id, const char *password)
 {
     return -ENODEV;
 }
-static inline int vnc_display_pw_expire(DisplayState *ds, time_t expires)
+static inline int vnc_display_pw_expire(const char *id, time_t expires)
 {
     return -ENODEV;
 };
diff --git a/ui/vnc.c b/ui/vnc.c
index a6549c8..fce4861 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2967,10 +2967,11 @@ static const DisplayChangeListenerOps dcl_ops = {
     .dpy_cursor_define = vnc_dpy_cursor_define,
 };
 
-void vnc_display_init(DisplayState *ds)
+void vnc_display_init(const char *id)
 {
     VncDisplay *vs = g_malloc0(sizeof(*vs));
 
+    vs->id = strdup(id);
     QTAILQ_INSERT_TAIL(&vnc_displays, vs, next);
 
     vs->lsock = -1;
@@ -2999,10 +3000,8 @@ void vnc_display_init(DisplayState *ds)
 }
 
 
-static void vnc_display_close(DisplayState *ds)
+static void vnc_display_close(VncDisplay *vs)
 {
-    VncDisplay *vs = vnc_display_find(NULL);
-
     if (!vs)
         return;
     g_free(vs->display);
@@ -3028,9 +3027,9 @@ static void vnc_display_close(DisplayState *ds)
 #endif
 }
 
-int vnc_display_password(DisplayState *ds, const char *password)
+int vnc_display_password(const char *id, const char *password)
 {
-    VncDisplay *vs = vnc_display_find(NULL);
+    VncDisplay *vs = vnc_display_find(id);
 
     if (!vs) {
         return -EINVAL;
@@ -3047,9 +3046,9 @@ int vnc_display_password(DisplayState *ds, const char *password)
     return 0;
 }
 
-int vnc_display_pw_expire(DisplayState *ds, time_t expires)
+int vnc_display_pw_expire(const char *id, time_t expires)
 {
-    VncDisplay *vs = vnc_display_find(NULL);
+    VncDisplay *vs = vnc_display_find(id);
 
     if (!vs) {
         return -EINVAL;
@@ -3059,16 +3058,16 @@ int vnc_display_pw_expire(DisplayState *ds, time_t expires)
     return 0;
 }
 
-char *vnc_display_local_addr(DisplayState *ds)
+char *vnc_display_local_addr(const char *id)
 {
-    VncDisplay *vs = vnc_display_find(NULL);
+    VncDisplay *vs = vnc_display_find(id);
 
     return vnc_socket_local_addr("%s:%s", vs->lsock);
 }
 
-void vnc_display_open(DisplayState *ds, const char *display, Error **errp)
+void vnc_display_open(const char *id, const char *display, Error **errp)
 {
-    VncDisplay *vs = vnc_display_find(NULL);
+    VncDisplay *vs = vnc_display_find(id);
     const char *options;
     int password = 0;
     int reverse = 0;
@@ -3088,7 +3087,7 @@ void vnc_display_open(DisplayState *ds, const char *display, Error **errp)
         error_setg(errp, "VNC display not active");
         return;
     }
-    vnc_display_close(ds);
+    vnc_display_close(vs);
     if (strcmp(display, "none") == 0)
         return;
 
@@ -3381,9 +3380,9 @@ fail:
 #endif /* CONFIG_VNC_WS */
 }
 
-void vnc_display_add_client(DisplayState *ds, int csock, bool skipauth)
+void vnc_display_add_client(const char *id, int csock, bool skipauth)
 {
-    VncDisplay *vs = vnc_display_find(NULL);
+    VncDisplay *vs = vnc_display_find(id);
 
     if (!vs) {
         return;
diff --git a/vl.c b/vl.c
index bea9656..f29f04f 100644
--- a/vl.c
+++ b/vl.c
@@ -4276,8 +4276,9 @@ int main(int argc, char **argv, char **envp)
     /* init remote displays */
     if (vnc_display) {
         Error *local_err = NULL;
-        vnc_display_init(ds);
-        vnc_display_open(ds, vnc_display, &local_err);
+        const char *id = "default";
+        vnc_display_init(id);
+        vnc_display_open(id, vnc_display, &local_err);
         if (local_err != NULL) {
             error_report("Failed to start VNC server on `%s': %s",
                          vnc_display, error_get_pretty(local_err));
@@ -4286,7 +4287,7 @@ int main(int argc, char **argv, char **envp)
         }
 
         if (show_vnc_port) {
-            printf("VNC server running on `%s'\n", vnc_display_local_addr(ds));
+            printf("VNC server running on `%s'\n", vnc_display_local_addr(id));
         }
     }
 #endif
-- 
1.8.3.1

[Qemu-devel] [PATCH 03/10] vnc: add display id to acl names

[Gerd Hoffmann]

In case the display id is "default" (which is the one you get if you
don't explicitly assign one) we keep the old name scheme, without
display, for backward compatibility reasons.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
---
 ui/vnc.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/ui/vnc.c b/ui/vnc.c
index fce4861..1b86365 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -3206,18 +3206,36 @@ void vnc_display_open(const char *id, const char *display, Error **errp)
 
 #ifdef CONFIG_VNC_TLS
     if (acl && x509 && vs->tls.x509verify) {
-        if (!(vs->tls.acl = qemu_acl_init("vnc.x509dname"))) {
+        char *aclname;
+
+        if (strcmp(vs->id, "default") == 0) {
+            aclname = g_strdup("vnc.x509dname");
+        } else {
+            aclname = g_strdup_printf("vnc.%s.x509dname", vs->id);
+        }
+        vs->tls.acl = qemu_acl_init(aclname);
+        if (!vs->tls.acl) {
             fprintf(stderr, "Failed to create x509 dname ACL\n");
             exit(1);
         }
+        g_free(aclname);
     }
 #endif
 #ifdef CONFIG_VNC_SASL
     if (acl && sasl) {
-        if (!(vs->sasl.acl = qemu_acl_init("vnc.username"))) {
+        char *aclname;
+
+        if (strcmp(vs->id, "default") == 0) {
+            aclname = g_strdup("vnc.username");
+        } else {
+            aclname = g_strdup_printf("vnc.%s.username", vs->id);
+        }
+        vs->sasl.acl = qemu_acl_init(aclname);
+        if (!vs->sasl.acl) {
             fprintf(stderr, "Failed to create username ACL\n");
             exit(1);
         }
+        g_free(aclname);
     }
 #endif
 
-- 
1.8.3.1

[Qemu-devel] [PATCH 04/10] vnc: switch to QemuOpts, allow multiple servers

[Gerd Hoffmann]

This patch switches vnc over to QemuOpts, and it (more or less
as side effect) allows multiple vnc server instances.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/ui/console.h |   4 +-
 qmp.c                |  15 ++-
 ui/vnc.c             | 270 ++++++++++++++++++++++++++++++++-------------------
 vl.c                 |  42 +++-----
 4 files changed, 199 insertions(+), 132 deletions(-)

diff --git a/include/ui/console.h b/include/ui/console.h
index 5ff2e27..887ed91 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -328,12 +328,14 @@ void cocoa_display_init(DisplayState *ds, int full_screen);
 
 /* vnc.c */
 void vnc_display_init(const char *id);
-void vnc_display_open(const char *id, const char *display, Error **errp);
+void vnc_display_open(const char *id, Error **errp);
 void vnc_display_add_client(const char *id, int csock, bool skipauth);
 char *vnc_display_local_addr(const char *id);
 #ifdef CONFIG_VNC
 int vnc_display_password(const char *id, const char *password);
 int vnc_display_pw_expire(const char *id, time_t expires);
+QemuOpts *vnc_parse_func(const char *str);
+int vnc_init_func(QemuOpts *opts, void *opaque);
 #else
 static inline int vnc_display_password(const char *id, const char *password)
 {
diff --git a/qmp.c b/qmp.c
index 0b4f131..963305c 100644
--- a/qmp.c
+++ b/qmp.c
@@ -368,7 +368,20 @@ void qmp_change_vnc_password(const char *password, Error **errp)
 
 static void qmp_change_vnc_listen(const char *target, Error **errp)
 {
-    vnc_display_open(NULL, target, errp);
+    QemuOptsList *olist = qemu_find_opts("vnc");
+    QemuOpts *opts;
+
+    if (strstr(target, "id=")) {
+        error_setg(errp, "id not supported");
+        return;
+    }
+
+    opts = qemu_opts_find(olist, "default");
+    if (opts) {
+        qemu_opts_del(opts);
+    }
+    opts = vnc_parse_func(target);
+    vnc_display_open("default", errp);
 }
 
 static void qmp_change_vnc(const char *target, bool has_arg, const char *arg,
diff --git a/ui/vnc.c b/ui/vnc.c
index 1b86365..ce1dd59 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -31,6 +31,7 @@
 #include "qemu/sockets.h"
 #include "qemu/timer.h"
 #include "qemu/acl.h"
+#include "qemu/config-file.h"
 #include "qapi/qmp/types.h"
 #include "qmp-commands.h"
 #include "qemu/osdep.h"
@@ -2969,7 +2970,12 @@ static const DisplayChangeListenerOps dcl_ops = {
 
 void vnc_display_init(const char *id)
 {
-    VncDisplay *vs = g_malloc0(sizeof(*vs));
+    VncDisplay *vs;
+
+    if (vnc_display_find(id) != NULL) {
+        return;
+    }
+    vs = g_malloc0(sizeof(*vs));
 
     vs->id = strdup(id);
     QTAILQ_INSERT_TAIL(&vnc_displays, vs, next);
@@ -3065,14 +3071,65 @@ char *vnc_display_local_addr(const char *id)
     return vnc_socket_local_addr("%s:%s", vs->lsock);
 }
 
-void vnc_display_open(const char *id, const char *display, Error **errp)
+static QemuOptsList qemu_vnc_opts = {
+    .name = "vnc",
+    .head = QTAILQ_HEAD_INITIALIZER(qemu_vnc_opts.head),
+    .implied_opt_name = "vnc",
+    .desc = {
+        {
+            .name = "vnc",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "websocket",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "x509",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "share",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "password",
+            .type = QEMU_OPT_BOOL,
+        },{
+            .name = "reverse",
+            .type = QEMU_OPT_BOOL,
+        },{
+            .name = "lock-key-sync",
+            .type = QEMU_OPT_BOOL,
+        },{
+            .name = "sasl",
+            .type = QEMU_OPT_BOOL,
+        },{
+            .name = "tls",
+            .type = QEMU_OPT_BOOL,
+        },{
+            .name = "x509verify",
+            .type = QEMU_OPT_BOOL,
+        },{
+            .name = "acl",
+            .type = QEMU_OPT_BOOL,
+        },{
+            .name = "lossy",
+            .type = QEMU_OPT_BOOL,
+        },{
+            .name = "non-adaptive",
+            .type = QEMU_OPT_BOOL,
+        },
+        { /* end of list */ }
+    },
+};
+
+void vnc_display_open(const char *id, Error **errp)
 {
     VncDisplay *vs = vnc_display_find(id);
-    const char *options;
+    QemuOpts *opts = qemu_opts_find(&qemu_vnc_opts, id);
+    const char *display, *websocket, *share;
     int password = 0;
     int reverse = 0;
 #ifdef CONFIG_VNC_TLS
     int tls = 0, x509 = 0;
+    const char *path;
 #endif
 #ifdef CONFIG_VNC_SASL
     int sasl = 0;
@@ -3088,115 +3145,86 @@ void vnc_display_open(const char *id, const char *display, Error **errp)
         return;
     }
     vnc_display_close(vs);
-    if (strcmp(display, "none") == 0)
-        return;
 
+    if (!opts) {
+        return;
+    }
+    display = qemu_opt_get(opts, "vnc");
+    if (!display || strcmp(display, "none") == 0) {
+        return;
+    }
     vs->display = g_strdup(display);
-    vs->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
-
-    options = display;
-    while ((options = strchr(options, ','))) {
-        options++;
-        if (strncmp(options, "password", 8) == 0) {
-            if (fips_get_state()) {
-                error_setg(errp,
-                           "VNC password auth disabled due to FIPS mode, "
-                           "consider using the VeNCrypt or SASL authentication "
-                           "methods as an alternative");
-                goto fail;
-            }
-            password = 1; /* Require password auth */
-        } else if (strncmp(options, "reverse", 7) == 0) {
-            reverse = 1;
-        } else if (strncmp(options, "no-lock-key-sync", 16) == 0) {
-            lock_key_sync = 0;
+
+    password = qemu_opt_get_bool(opts, "password", false);
+    if (password && fips_get_state()) {
+        error_setg(errp,
+                   "VNC password auth disabled due to FIPS mode, "
+                   "consider using the VeNCrypt or SASL authentication "
+                   "methods as an alternative");
+        goto fail;
+    }
+
+    reverse = qemu_opt_get_bool(opts, "reverse", false);
+    lock_key_sync = qemu_opt_get_bool(opts, "lock-key-sync", true);
 #ifdef CONFIG_VNC_SASL
-        } else if (strncmp(options, "sasl", 4) == 0) {
-            sasl = 1; /* Require SASL auth */
+    sasl = qemu_opt_get_bool(opts, "sasl", false);
 #endif
-#ifdef CONFIG_VNC_WS
-        } else if (strncmp(options, "websocket", 9) == 0) {
-            char *start, *end;
-            vs->websocket = 1;
-
-            /* Check for 'websocket=<port>' */
-            start = strchr(options, '=');
-            end = strchr(options, ',');
-            if (start && (!end || (start < end))) {
-                int len = end ? end-(start+1) : strlen(start+1);
-                if (len < 6) {
-                    /* extract the host specification from display */
-                    char  *host = NULL, *port = NULL, *host_end = NULL;
-                    port = g_strndup(start + 1, len);
-
-                    /* ipv6 hosts have colons */
-                    end = strchr(display, ',');
-                    host_end = g_strrstr_len(display, end - display, ":");
-
-                    if (host_end) {
-                        host = g_strndup(display, host_end - display + 1);
-                    } else {
-                        host = g_strndup(":", 1);
-                    }
-                    vs->ws_display = g_strconcat(host, port, NULL);
-                    g_free(host);
-                    g_free(port);
-                }
-            }
-#endif /* CONFIG_VNC_WS */
 #ifdef CONFIG_VNC_TLS
-        } else if (strncmp(options, "tls", 3) == 0) {
-            tls = 1; /* Require TLS */
-        } else if (strncmp(options, "x509", 4) == 0) {
-            char *start, *end;
-            x509 = 1; /* Require x509 certificates */
-            if (strncmp(options, "x509verify", 10) == 0)
-                vs->tls.x509verify = 1; /* ...and verify client certs */
-
-            /* Now check for 'x509=/some/path' postfix
-             * and use that to setup x509 certificate/key paths */
-            start = strchr(options, '=');
-            end = strchr(options, ',');
-            if (start && (!end || (start < end))) {
-                int len = end ? end-(start+1) : strlen(start+1);
-                char *path = g_strndup(start + 1, len);
-
-                VNC_DEBUG("Trying certificate path '%s'\n", path);
-                if (vnc_tls_set_x509_creds_dir(vs, path) < 0) {
-                    error_setg(errp, "Failed to find x509 certificates/keys in %s", path);
-                    g_free(path);
-                    goto fail;
-                }
-                g_free(path);
-            } else {
-                error_setg(errp, "No certificate path provided");
-                goto fail;
-            }
+    tls  = qemu_opt_get_bool(opts, "tls", false);
+    path = qemu_opt_get(opts, "x509");
+    if (path) {
+        x509 = 1;
+        vs->tls.x509verify = qemu_opt_get_bool(opts, "x509verify", false);
+        if (vnc_tls_set_x509_creds_dir(vs, path) < 0) {
+            error_setg(errp, "Failed to find x509 certificates/keys in %s",
+                       path);
+            goto fail;
+        }
+    }
 #endif
 #if defined(CONFIG_VNC_TLS) || defined(CONFIG_VNC_SASL)
-        } else if (strncmp(options, "acl", 3) == 0) {
-            acl = 1;
-#endif
-        } else if (strncmp(options, "lossy", 5) == 0) {
-#ifdef CONFIG_VNC_JPEG
-            vs->lossy = true;
+    acl = qemu_opt_get_bool(opts, "acl", false);
 #endif
-        } else if (strncmp(options, "non-adaptive", 12) == 0) {
-            vs->non_adaptive = true;
-        } else if (strncmp(options, "share=", 6) == 0) {
-            if (strncmp(options+6, "ignore", 6) == 0) {
-                vs->share_policy = VNC_SHARE_POLICY_IGNORE;
-            } else if (strncmp(options+6, "allow-exclusive", 15) == 0) {
-                vs->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
-            } else if (strncmp(options+6, "force-shared", 12) == 0) {
-                vs->share_policy = VNC_SHARE_POLICY_FORCE_SHARED;
-            } else {
-                error_setg(errp, "unknown vnc share= option");
-                goto fail;
-            }
+
+    share = qemu_opt_get(opts, "share");
+    if (share) {
+        if (strcmp(share, "ignore") == 0) {
+            vs->share_policy = VNC_SHARE_POLICY_IGNORE;
+        } else if (strcmp(share, "allow-exclusive") == 0) {
+            vs->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
+        } else if (strcmp(share, "force-shared") == 0) {
+            vs->share_policy = VNC_SHARE_POLICY_FORCE_SHARED;
+        } else {
+            error_setg(errp, "unknown vnc share= option");
+            goto fail;
+        }
+    } else {
+        vs->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
+    }
+
+ #ifdef CONFIG_VNC_WS
+    websocket = qemu_opt_get(opts, "websocket");
+    if (websocket) {
+        /* extract the host specification from display */
+        char  *host = NULL, *host_end = NULL;
+        vs->websocket = 1;
+
+        /* ipv6 hosts have colons */
+        host_end = strrchr(display, ':');
+        if (host_end) {
+            host = g_strndup(display, host_end - display + 1);
+        } else {
+            host = g_strdup(":");
         }
+        vs->ws_display = g_strconcat(host, websocket, NULL);
+        g_free(host);
     }
+#endif /* CONFIG_VNC_WS */
 
+#ifdef CONFIG_VNC_JPEG
+    vs->lossy = qemu_opt_get_bool(opts, "lossy", false);
+#endif
+    vs->non_adaptive = qemu_opt_get_bool(opts, "non-adaptive", false);
     /* adaptive updates are only used with tight encoding and
      * if lossy updates are enabled so we can disable all the
      * calculations otherwise */
@@ -3407,3 +3435,43 @@ void vnc_display_add_client(const char *id, int csock, bool skipauth)
     }
     vnc_connect(vs, csock, skipauth, false);
 }
+
+QemuOpts *vnc_parse_func(const char *str)
+{
+    return qemu_opts_parse(qemu_find_opts("vnc"), str, 1);
+}
+
+int vnc_init_func(QemuOpts *opts, void *opaque)
+{
+    Error *local_err = NULL;
+    QemuOptsList *olist = qemu_find_opts("vnc");
+    char *id = (char *)qemu_opts_id(opts);
+
+    if (!id) {
+        /* auto-assign id if not present */
+        int i = 2;
+        id = g_strdup("default");
+        while (qemu_opts_find(olist, id)) {
+            g_free(id);
+            id = g_strdup_printf("vnc%d", i++);
+        }
+        qemu_opts_set_id(opts, id);
+    }
+
+    vnc_display_init(id);
+    vnc_display_open(id, &local_err);
+    if (local_err != NULL) {
+        error_report("Failed to start VNC server on `%s': %s",
+                     qemu_opt_get(opts, "display"),
+                     error_get_pretty(local_err));
+        error_free(local_err);
+        exit(1);
+    }
+    return 0;
+}
+
+static void vnc_register_config(void)
+{
+    qemu_add_opts(&qemu_vnc_opts);
+}
+machine_init(vnc_register_config);
diff --git a/vl.c b/vl.c
index f29f04f..00ee206 100644
--- a/vl.c
+++ b/vl.c
@@ -158,9 +158,6 @@ int smp_cpus = 1;
 int max_cpus = 0;
 int smp_cores = 1;
 int smp_threads = 1;
-#ifdef CONFIG_VNC
-const char *vnc_display;
-#endif
 int acpi_enabled = 1;
 int no_hpet = 0;
 int fd_bootchk = 1;
@@ -1994,16 +1991,12 @@ static DisplayType select_display(const char *p)
 #endif
     } else if (strstart(p, "vnc", &opts)) {
 #ifdef CONFIG_VNC
-        display_remote++;
-
-        if (*opts) {
-            const char *nextopt;
-
-            if (strstart(opts, "=", &nextopt)) {
-                vnc_display = nextopt;
+        if (*opts == '=') {
+            display_remote++;
+            if (vnc_parse_func(opts+1) == NULL) {
+                exit(1);
             }
-        }
-        if (!vnc_display) {
+        } else {
             fprintf(stderr, "VNC requires a display argument vnc=<display>\n");
             exit(1);
         }
@@ -3473,7 +3466,9 @@ int main(int argc, char **argv, char **envp)
 	    case QEMU_OPTION_vnc:
 #ifdef CONFIG_VNC
                 display_remote++;
-                vnc_display = optarg;
+                if (vnc_parse_func(optarg) == NULL) {
+                    exit(1);
+                }
 #else
                 fprintf(stderr, "VNC support is disabled\n");
                 exit(1);
@@ -3960,7 +3955,7 @@ int main(int argc, char **argv, char **envp)
 #elif defined(CONFIG_SDL) || defined(CONFIG_COCOA)
         display_type = DT_SDL;
 #elif defined(CONFIG_VNC)
-        vnc_display = "localhost:0,to=99";
+        vnc_parse_func("localhost:0,to=99,id=default");
         show_vnc_port = 1;
 #else
         display_type = DT_NONE;
@@ -4274,21 +4269,10 @@ int main(int argc, char **argv, char **envp)
 
 #ifdef CONFIG_VNC
     /* init remote displays */
-    if (vnc_display) {
-        Error *local_err = NULL;
-        const char *id = "default";
-        vnc_display_init(id);
-        vnc_display_open(id, vnc_display, &local_err);
-        if (local_err != NULL) {
-            error_report("Failed to start VNC server on `%s': %s",
-                         vnc_display, error_get_pretty(local_err));
-            error_free(local_err);
-            exit(1);
-        }
-
-        if (show_vnc_port) {
-            printf("VNC server running on `%s'\n", vnc_display_local_addr(id));
-        }
+    qemu_opts_foreach(qemu_find_opts("vnc"), vnc_init_func, NULL, 0);
+    if (show_vnc_port) {
+        printf("VNC server running on `%s'\n",
+               vnc_display_local_addr("default"));
     }
 #endif
 #ifdef CONFIG_SPICE
-- 
1.8.3.1

[Qemu-devel] [PATCH 05/10] vnc: allow binding servers to qemu consoles

[Gerd Hoffmann]

This patch adds a display= parameter to the vnc options.  This allows to
bind a vnc server instance to a specific display, allowing to create a
multiseat setup with a vnc server for each seat.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 ui/vnc.c | 50 +++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 43 insertions(+), 7 deletions(-)

diff --git a/ui/vnc.c b/ui/vnc.c
index ce1dd59..dd09fc1 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -27,6 +27,7 @@
 #include "vnc.h"
 #include "vnc-jobs.h"
 #include "trace.h"
+#include "hw/qdev.h"
 #include "sysemu/sysemu.h"
 #include "qemu/sockets.h"
 #include "qemu/timer.h"
@@ -1665,7 +1666,8 @@ static void do_key_event(VncState *vs, int down, int keycode, int sym)
             vs->modifiers_state[keycode] = 0;
         break;
     case 0x02 ... 0x0a: /* '1' to '9' keys */
-        if (down && vs->modifiers_state[0x1d] && vs->modifiers_state[0x38]) {
+        if (vs->vd->dcl.con == NULL &&
+            down && vs->modifiers_state[0x1d] && vs->modifiers_state[0x38]) {
             /* Reset the modifiers sent to the current console */
             reset_keys(vs);
             console_select(keycode - 0x02);
@@ -2073,8 +2075,8 @@ static void set_pixel_format(VncState *vs,
 
     set_pixel_conversion(vs);
 
-    graphic_hw_invalidate(NULL);
-    graphic_hw_update(NULL);
+    graphic_hw_invalidate(vs->vd->dcl.con);
+    graphic_hw_update(vs->vd->dcl.con);
 }
 
 static void pixel_format_message (VncState *vs) {
@@ -2801,7 +2803,7 @@ static void vnc_refresh(DisplayChangeListener *dcl)
         return;
     }
 
-    graphic_hw_update(NULL);
+    graphic_hw_update(vd->dcl.con);
 
     if (vnc_trylock_display(vd)) {
         update_displaychangelistener(&vd->dcl, VNC_REFRESH_INTERVAL_BASE);
@@ -2907,7 +2909,7 @@ void vnc_init_state(VncState *vs)
 
     QTAILQ_INSERT_HEAD(&vd->clients, vs, next);
 
-    graphic_hw_update(NULL);
+    graphic_hw_update(vd->dcl.con);
 
     vnc_write(vs, "RFB 003.008\n", 12);
     vnc_flush(vs);
@@ -2930,7 +2932,7 @@ static void vnc_listen_read(void *opaque, bool websocket)
     int csock;
 
     /* Catch-up */
-    graphic_hw_update(NULL);
+    graphic_hw_update(vs->dcl.con);
 #ifdef CONFIG_VNC_WS
     if (websocket) {
         csock = qemu_accept(vs->lwebsock, (struct sockaddr *)&addr, &addrlen);
@@ -3089,6 +3091,12 @@ static QemuOptsList qemu_vnc_opts = {
             .name = "share",
             .type = QEMU_OPT_STRING,
         },{
+            .name = "display",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "head",
+            .type = QEMU_OPT_NUMBER,
+        },{
             .name = "password",
             .type = QEMU_OPT_BOOL,
         },{
@@ -3124,7 +3132,8 @@ void vnc_display_open(const char *id, Error **errp)
 {
     VncDisplay *vs = vnc_display_find(id);
     QemuOpts *opts = qemu_opts_find(&qemu_vnc_opts, id);
-    const char *display, *websocket, *share;
+    const char *display, *websocket, *share, *device_id;
+    QemuConsole *con;
     int password = 0;
     int reverse = 0;
 #ifdef CONFIG_VNC_TLS
@@ -3353,6 +3362,33 @@ void vnc_display_open(const char *id, Error **errp)
 #endif
     vs->lock_key_sync = lock_key_sync;
 
+    device_id = qemu_opt_get(opts, "display");
+    if (device_id) {
+        DeviceState *dev;
+        int head = qemu_opt_get_number(opts, "head", 0);
+
+        dev = qdev_find_recursive(sysbus_get_default(), device_id);
+        if (dev == NULL) {
+            error_set(errp, QERR_DEVICE_NOT_FOUND, device_id);
+            goto fail;
+        }
+
+        con = qemu_console_lookup_by_device(dev, head);
+        if (con == NULL) {
+            error_setg(errp, "Device %s is not bound to a QemuConsole",
+                       device_id);
+            goto fail;
+        }
+    } else {
+        con = NULL;
+    }
+
+    if (con != vs->dcl.con) {
+        unregister_displaychangelistener(&vs->dcl);
+        vs->dcl.con = con;
+        register_displaychangelistener(&vs->dcl);
+    }
+
     if (reverse) {
         /* connect to viewer */
         int csock;
-- 
1.8.3.1

[Qemu-devel] [PATCH 06/10] vnc: update docs/multiseat.txt

[Gerd Hoffmann]

vnc joins the party ;)
Also some s/head/seat/ to clarify.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 docs/multiseat.txt | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/docs/multiseat.txt b/docs/multiseat.txt
index 67151e0..b963665 100644
--- a/docs/multiseat.txt
+++ b/docs/multiseat.txt
@@ -7,7 +7,7 @@ host side
 
 First you must compile qemu with a user interface supporting
 multihead/multiseat and input event routing.  Right now this
-list includes sdl2 and gtk (both 2+3):
+list includes sdl2, gtk (both 2+3) and vnc:
 
   ./configure --enable-sdl --with-sdlabi=2.0
 
@@ -16,16 +16,16 @@ or
   ./configure --enable-gtk
 
 
-Next put together the qemu command line:
+Next put together the qemu command line (sdk/gtk):
 
 qemu	-enable-kvm -usb $memory $disk $whatever \
 	-display [ sdl | gtk ] \
 	-vga std \
 	-device usb-tablet
 
-That is it for the first head, which will use the standard vga, the
+That is it for the first seat, which will use the standard vga, the
 standard ps/2 keyboard (implicitly there) and the usb-tablet.  Now the
-additional switches for the second head:
+additional switches for the second seat:
 
 	-device pci-bridge,addr=12.0,chassis_nr=2,id=head.2 \
 	-device secondary-vga,bus=head.2,addr=02.0,id=video.2 \
@@ -47,6 +47,16 @@ in a separate tab.  You can either simply switch tabs to switch heads,
 or use the "View / Detach tab" menu item to move one of the displays
 to its own window so you can see both display devices side-by-side.
 
+For vnc some additional configuration on the command line is needed.
+We'll create two vnc server instances, and bind the second one to the
+second seat, simliar to input devices:
+
+	-display vnc=:1,id=primary \
+	-display vnc=:2,id=secondary,display=video.2
+
+Connecting to vnc display :1 gives you access to the first seat, and
+likewise connecting to vnc display :2 shows the second seat.
+
 Note on spice: Spice handles multihead just fine.  But it can't do
 multiseat.  For tablet events the event source is sent to the spice
 agent.  But qemu can't figure it, so it can't do input routing.
-- 
1.8.3.1

[Qemu-devel] [PATCH 07/10] vnc: track & limit connections

[Gerd Hoffmann]

Also track the number of connections in "connecting" and "shared" state
(in addition to the "exclusive" state).  Apply a configurable limit to
these connections.

The logic to apply the limit to connections in "shared" state is pretty
simple:  When the limit is reached no new connections are allowed.

The logic to apply the limit to connections in "connecting" state (this
is the state you are in *before* successful authentication) is
slightly different:  A new connect kicks out the oldest client which is
still in "connecting" state.  This avoids a easy DoS by unauthenticated
users by simply opening connections until the limit is reached.

Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 ui/vnc.c | 46 +++++++++++++++++++++++++++++++++++++++++++---
 ui/vnc.h |  3 +++
 2 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/ui/vnc.c b/ui/vnc.c
index dd09fc1..2ed16dc 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -68,12 +68,34 @@ static void vnc_set_share_mode(VncState *vs, VncShareMode mode)
             vs->csock, mn[vs->share_mode], mn[mode]);
 #endif
 
-    if (vs->share_mode == VNC_SHARE_MODE_EXCLUSIVE) {
+    switch (vs->share_mode) {
+    case VNC_SHARE_MODE_CONNECTING:
+        vs->vd->num_connecting--;
+        break;
+    case VNC_SHARE_MODE_SHARED:
+        vs->vd->num_shared--;
+        break;
+    case VNC_SHARE_MODE_EXCLUSIVE:
         vs->vd->num_exclusive--;
+        break;
+    default:
+        break;
     }
+
     vs->share_mode = mode;
-    if (vs->share_mode == VNC_SHARE_MODE_EXCLUSIVE) {
+
+    switch (vs->share_mode) {
+    case VNC_SHARE_MODE_CONNECTING:
+        vs->vd->num_connecting++;
+        break;
+    case VNC_SHARE_MODE_SHARED:
+        vs->vd->num_shared++;
+        break;
+    case VNC_SHARE_MODE_EXCLUSIVE:
         vs->vd->num_exclusive++;
+        break;
+    default:
+        break;
     }
 }
 
@@ -2337,6 +2359,11 @@ static int protocol_client_init(VncState *vs, uint8_t *data, size_t len)
     }
     vnc_set_share_mode(vs, mode);
 
+    if (vs->vd->num_shared > vs->vd->connections_limit) {
+        vnc_disconnect_start(vs);
+        return 0;
+    }
+
     vs->client_width = pixman_image_get_width(vs->vd->server);
     vs->client_height = pixman_image_get_height(vs->vd->server);
     vnc_write_u16(vs, vs->client_width);
@@ -2889,6 +2916,15 @@ static void vnc_connect(VncDisplay *vd, int csock,
     {
         vnc_init_state(vs);
     }
+
+    if (vd->num_connecting > vd->connections_limit) {
+        QTAILQ_FOREACH(vs, &vd->clients, next) {
+            if (vs->share_mode == VNC_SHARE_MODE_CONNECTING) {
+                vnc_disconnect_start(vs);
+                return;
+            }
+        }
+    }
 }
 
 void vnc_init_state(VncState *vs)
@@ -2907,7 +2943,7 @@ void vnc_init_state(VncState *vs)
     qemu_mutex_init(&vs->output_mutex);
     vs->bh = qemu_bh_new(vnc_jobs_bh, vs);
 
-    QTAILQ_INSERT_HEAD(&vd->clients, vs, next);
+    QTAILQ_INSERT_TAIL(&vd->clients, vs, next);
 
     graphic_hw_update(vd->dcl.con);
 
@@ -3097,6 +3133,9 @@ static QemuOptsList qemu_vnc_opts = {
             .name = "head",
             .type = QEMU_OPT_NUMBER,
         },{
+            .name = "connections",
+            .type = QEMU_OPT_NUMBER,
+        },{
             .name = "password",
             .type = QEMU_OPT_BOOL,
         },{
@@ -3210,6 +3249,7 @@ void vnc_display_open(const char *id, Error **errp)
     } else {
         vs->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
     }
+    vs->connections_limit = qemu_opt_get_number(opts, "connections", 32);
 
  #ifdef CONFIG_VNC_WS
     websocket = qemu_opt_get(opts, "websocket");
diff --git a/ui/vnc.h b/ui/vnc.h
index 6fe8278..5e2b1a5 100644
--- a/ui/vnc.h
+++ b/ui/vnc.h
@@ -150,7 +150,10 @@ typedef enum VncSharePolicy {
 struct VncDisplay
 {
     QTAILQ_HEAD(, VncState) clients;
+    int num_connecting;
+    int num_shared;
     int num_exclusive;
+    int connections_limit;
     VncSharePolicy share_policy;
     int lsock;
 #ifdef CONFIG_VNC_WS
-- 
1.8.3.1

[Qemu-devel] [PATCH 08/10] vnc: factor out qmp_query_client_list

[Gerd Hoffmann]

so we can reuse it for the new vnc query command.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 ui/vnc.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/ui/vnc.c b/ui/vnc.c
index 2ed16dc..d7c7865 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -385,6 +385,20 @@ static VncDisplay *vnc_display_find(const char *id)
     return NULL;
 }
 
+static VncClientInfoList *qmp_query_client_list(VncDisplay *vd)
+{
+    VncClientInfoList *cinfo, *prev = NULL;
+    VncState *client;
+
+    QTAILQ_FOREACH(client, &vd->clients, next) {
+        cinfo = g_new0(VncClientInfoList, 1);
+        cinfo->value = qmp_query_vnc_client(client);
+        cinfo->next = prev;
+        prev = cinfo;
+    }
+    return prev;
+}
+
 VncInfo *qmp_query_vnc(Error **errp)
 {
     VncInfo *info = g_malloc0(sizeof(*info));
@@ -393,30 +407,16 @@ VncInfo *qmp_query_vnc(Error **errp)
     if (vd == NULL || vd->display == NULL) {
         info->enabled = false;
     } else {
-        VncClientInfoList *cur_item = NULL;
         struct sockaddr_storage sa;
         socklen_t salen = sizeof(sa);
         char host[NI_MAXHOST];
         char serv[NI_MAXSERV];
-        VncState *client;
 
         info->enabled = true;
 
         /* for compatibility with the original command */
         info->has_clients = true;
-
-        QTAILQ_FOREACH(client, &vd->clients, next) {
-            VncClientInfoList *cinfo = g_malloc0(sizeof(*info));
-            cinfo->value = qmp_query_vnc_client(client);
-
-            /* XXX: waiting for the qapi to support GSList */
-            if (!cur_item) {
-                info->clients = cur_item = cinfo;
-            } else {
-                cur_item->next = cinfo;
-                cur_item = cinfo;
-            }
-        }
+        info->clients = qmp_query_client_list(vd);
 
         if (vd->lsock == -1) {
             return info;
-- 
1.8.3.1

[Qemu-devel] [PATCH 09/10] monitor: add query-vnc-servers command

[Gerd Hoffmann]

Add new query vnc qmp command, for the lack of better ideas just name it
"query-vnc-servers".  Changes over query-vnc:

 * It returns a list of vnc servers, so multiple vnc server instances
   are covered.
 * Each vnc server returns a list of server sockets.  Followup patch
   will use that to also report websockets.  In case we add support for
   multiple server sockets server sockets (to better support ipv4+ipv6
   dualstack) we can add them to the list too.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 qapi-schema.json |  68 ++++++++++++++++++++++++++++
 qmp-commands.hx  |   5 +++
 ui/vnc.c         | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 206 insertions(+)

diff --git a/qapi-schema.json b/qapi-schema.json
index 563b4ad..8291f6b 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -751,6 +751,63 @@
            '*service': 'str', '*auth': 'str', '*clients': ['VncClientInfo']} }
 
 ##
+# @VncPriAuth:
+#
+# vnc primary authentication method.
+#
+# Since: 2.3
+##
+{ 'enum': 'VncPrimaryAuth',
+  'data': [ 'none', 'vnc', 'ra2', 'ra2ne', 'tight', 'ultra',
+            'tls', 'vencrypt', 'sasl' ] }
+
+##
+# @VncVencryptSubAuth:
+#
+# vnc sub authentication method with vencrypt.
+#
+# Since: 2.3
+##
+{ 'enum': 'VncVencryptSubAuth',
+  'data': [ 'plain',
+            'tls-none',  'x509-none',
+            'tls-vnc',   'x509-vnc',
+            'tls-plain', 'x509-plain',
+            'tls-sasl',  'x509-sasl' ] }
+
+##
+# @VncInfo2:
+#
+# Information about a vnc server
+#
+# @id: vnc server name.
+#
+# @server: A list of @VncBasincInfo describing all listening sockets.
+#          The list can be empty (in case the vnc server is disabled).
+#          It also may have multiple entries: normal + websocket,
+#          possibly also ipv4 + ipv6 in the future.
+#
+# @clients: A list of @VncClientInfo of all currently connected clients.
+#           The list can be empty, for obvious reasons.
+#
+# @auth: The current authentication type used by the server
+#
+# @vencrypt: #optional The vencrypt sub authentication type used by the server,
+#            only specified in case auth == vencrypt.
+#
+# @display: #optional The display device the vnc server is linked to.
+#
+# Since: 2.3
+##
+{ 'type': 'VncInfo2',
+  'data': { 'id'        : 'str',
+            'server'    : ['VncBasicInfo'],
+            'clients'   : ['VncClientInfo'],
+            'auth'      : 'VncPrimaryAuth',
+            '*vencrypt' : 'VncVencryptSubAuth',
+            '*display'  : 'str' } }
+
+##
 # @query-vnc:
 #
 # Returns information about the current VNC server
@@ -762,6 +819,17 @@
 { 'command': 'query-vnc', 'returns': 'VncInfo' }
 
 ##
+# @query-vnc-servers:
+#
+# Returns a list of vnc servers.  The list can be empty.
+#
+# Returns: a list of @VncInfo2
+#
+# Since: 2.3
+##
+{ 'command': 'query-vnc-servers', 'returns': ['VncInfo2'] }
+
+##
 # @SpiceBasicInfo
 #
 # The basic information for SPICE network connection
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 6945d30..00c004b 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2825,6 +2825,11 @@ EQMP
         .args_type  = "",
         .mhandler.cmd_new = qmp_marshal_input_query_vnc,
     },
+    {
+        .name       = "query-vnc-servers",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_input_query_vnc_servers,
+    },
 
 SQMP
 query-spice
diff --git a/ui/vnc.c b/ui/vnc.c
index d7c7865..f5dd92b 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -456,6 +456,139 @@ out_error:
     return NULL;
 }
 
+static VncBasicInfoList *qmp_query_server_entry(int socket,
+                                                VncBasicInfoList *prev)
+{
+    VncBasicInfoList *list;
+    VncBasicInfo *info;
+    struct sockaddr_storage sa;
+    socklen_t salen = sizeof(sa);
+    char host[NI_MAXHOST];
+    char serv[NI_MAXSERV];
+
+    if (getsockname(socket, (struct sockaddr *)&sa, &salen) < 0 ||
+        getnameinfo((struct sockaddr *)&sa, salen,
+                    host, sizeof(host), serv, sizeof(serv),
+                    NI_NUMERICHOST | NI_NUMERICSERV) < 0) {
+        return prev;
+    }
+
+    info = g_new0(VncBasicInfo, 1);
+    info->host = g_strdup(host);
+    info->service = g_strdup(serv);
+    info->family = inet_netfamily(sa.ss_family);
+
+    list = g_new0(VncBasicInfoList, 1);
+    list->value = info;
+    list->next = prev;
+    return list;
+}
+
+static void qmp_query_auth(VncDisplay *vd, VncInfo2 *info)
+{
+    switch (vd->auth) {
+    case VNC_AUTH_VNC:
+        info->auth = VNC_PRIMARY_AUTH_VNC;
+        break;
+    case VNC_AUTH_RA2:
+        info->auth = VNC_PRIMARY_AUTH_RA2;
+        break;
+    case VNC_AUTH_RA2NE:
+        info->auth = VNC_PRIMARY_AUTH_RA2NE;
+        break;
+    case VNC_AUTH_TIGHT:
+        info->auth = VNC_PRIMARY_AUTH_TIGHT;
+        break;
+    case VNC_AUTH_ULTRA:
+        info->auth = VNC_PRIMARY_AUTH_ULTRA;
+        break;
+    case VNC_AUTH_TLS:
+        info->auth = VNC_PRIMARY_AUTH_TLS;
+        break;
+    case VNC_AUTH_VENCRYPT:
+        info->auth = VNC_PRIMARY_AUTH_VENCRYPT;
+#ifdef CONFIG_VNC_TLS
+        info->has_vencrypt = true;
+        switch (vd->subauth) {
+        case VNC_AUTH_VENCRYPT_PLAIN:
+            info->vencrypt = VNC_VENCRYPT_SUB_AUTH_PLAIN;
+            break;
+        case VNC_AUTH_VENCRYPT_TLSNONE:
+            info->vencrypt = VNC_VENCRYPT_SUB_AUTH_TLS_NONE;
+            break;
+        case VNC_AUTH_VENCRYPT_TLSVNC:
+            info->vencrypt = VNC_VENCRYPT_SUB_AUTH_TLS_VNC;
+            break;
+        case VNC_AUTH_VENCRYPT_TLSPLAIN:
+            info->vencrypt = VNC_VENCRYPT_SUB_AUTH_TLS_PLAIN;
+            break;
+        case VNC_AUTH_VENCRYPT_X509NONE:
+            info->vencrypt = VNC_VENCRYPT_SUB_AUTH_X509_NONE;
+            break;
+        case VNC_AUTH_VENCRYPT_X509VNC:
+            info->vencrypt = VNC_VENCRYPT_SUB_AUTH_X509_VNC;
+            break;
+        case VNC_AUTH_VENCRYPT_X509PLAIN:
+            info->vencrypt = VNC_VENCRYPT_SUB_AUTH_X509_PLAIN;
+            break;
+        case VNC_AUTH_VENCRYPT_TLSSASL:
+            info->vencrypt = VNC_VENCRYPT_SUB_AUTH_TLS_SASL;
+            break;
+        case VNC_AUTH_VENCRYPT_X509SASL:
+            info->vencrypt = VNC_VENCRYPT_SUB_AUTH_X509_SASL;
+            break;
+        default:
+            info->has_vencrypt = false;
+            break;
+        }
+#endif
+        break;
+    case VNC_AUTH_SASL:
+        info->auth = VNC_PRIMARY_AUTH_SASL;
+        break;
+    case VNC_AUTH_NONE:
+    default:
+        info->auth = VNC_PRIMARY_AUTH_NONE;
+        break;
+    }
+}
+
+VncInfo2List *qmp_query_vnc_servers(Error **errp)
+{
+    VncInfo2List *item, *prev = NULL;
+    VncInfo2 *info;
+    VncDisplay *vd;
+    DeviceState *dev;
+
+    QTAILQ_FOREACH(vd, &vnc_displays, next) {
+        info = g_new0(VncInfo2, 1);
+        info->id = g_strdup(vd->id);
+        info->clients = qmp_query_client_list(vd);
+        qmp_query_auth(vd, info);
+        if (vd->dcl.con) {
+            dev = DEVICE(object_property_get_link(OBJECT(vd->dcl.con),
+                                                  "device", NULL));
+            info->has_display = true;
+            info->display = g_strdup(dev->id);
+        }
+        if (vd->lsock != -1) {
+            info->server = qmp_query_server_entry(vd->lsock,
+                                                  info->server);
+        }
+#ifdef CONFIG_VNC_WS
+        if (vd->lwebsock != -1) {
+            /* TODO */
+        }
+#endif
+
+        item = g_new0(VncInfo2List, 1);
+        item->value = info;
+        item->next = prev;
+        prev = item;
+    }
+    return prev;
+}
+
 /* TODO
    1) Get the queue working for IO.
    2) there is some weirdness when using the -S option (the screen is grey
-- 
1.8.3.1

[Qemu-devel] [PATCH 10/10] monitor: add vnc websockets

[Gerd Hoffmann]

Add websockets bool to VncBasicInfo, report websocket server sockets,
flag websocket client connections.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 qapi-schema.json |  5 ++++-
 ui/vnc.c         | 15 ++++++++++++---
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/qapi-schema.json b/qapi-schema.json
index 8291f6b..9d4b10e 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -672,12 +672,15 @@
 #
 # @family: address family
 #
+# @websocket: true in case the socket is a websocket (since 2.3).
+#
 # Since: 2.1
 ##
 { 'type': 'VncBasicInfo',
   'data': { 'host': 'str',
             'service': 'str',
-            'family': 'NetworkAddressFamily' } }
+            'family': 'NetworkAddressFamily',
+            'websocket': 'bool' } }
 
 ##
 # @VncServerInfo
diff --git a/ui/vnc.c b/ui/vnc.c
index f5dd92b..6aac416 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -353,6 +353,9 @@ static VncClientInfo *qmp_query_vnc_client(const VncState *client)
     info->base->host = g_strdup(host);
     info->base->service = g_strdup(serv);
     info->base->family = inet_netfamily(sa.ss_family);
+#ifdef CONFIG_VNC_WS
+    info->base->websocket = client->websocket;
+#endif
 
 #ifdef CONFIG_VNC_TLS
     if (client->tls.session && client->tls.dname) {
@@ -457,6 +460,7 @@ out_error:
 }
 
 static VncBasicInfoList *qmp_query_server_entry(int socket,
+                                                bool websocket,
                                                 VncBasicInfoList *prev)
 {
     VncBasicInfoList *list;
@@ -477,6 +481,7 @@ static VncBasicInfoList *qmp_query_server_entry(int socket,
     info->host = g_strdup(host);
     info->service = g_strdup(serv);
     info->family = inet_netfamily(sa.ss_family);
+    info->websocket = websocket;
 
     list = g_new0(VncBasicInfoList, 1);
     list->value = info;
@@ -572,12 +577,13 @@ VncInfo2List *qmp_query_vnc_servers(Error **errp)
             info->display = g_strdup(dev->id);
         }
         if (vd->lsock != -1) {
-            info->server = qmp_query_server_entry(vd->lsock,
+            info->server = qmp_query_server_entry(vd->lsock, false,
                                                   info->server);
         }
 #ifdef CONFIG_VNC_WS
         if (vd->lwebsock != -1) {
-            /* TODO */
+            info->server = qmp_query_server_entry(vd->lwebsock, true,
+                                                  info->server);
         }
 #endif
 
@@ -3304,10 +3310,13 @@ void vnc_display_open(const char *id, Error **errp)
 {
     VncDisplay *vs = vnc_display_find(id);
     QemuOpts *opts = qemu_opts_find(&qemu_vnc_opts, id);
-    const char *display, *websocket, *share, *device_id;
+    const char *display, *share, *device_id;
     QemuConsole *con;
     int password = 0;
     int reverse = 0;
+#ifdef CONFIG_VNC_WS
+    const char *websocket;
+#endif
 #ifdef CONFIG_VNC_TLS
     int tls = 0, x509 = 0;
     const char *path;
-- 
1.8.3.1

Re: [Qemu-devel] [PATCH 04/10] vnc: switch to QemuOpts, allow multiple servers

[Markus Armbruster]

Gerd Hoffmann <kraxel@redhat.com> writes:

> This patch switches vnc over to QemuOpts, and it (more or less
> as side effect) allows multiple vnc server instances.
>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

I'm afraid this broke monitor command change vnc.

Reproducer

    Terminal 1:

        $ qemu -nodefaults -S -display vnc=:0 -monitor stdio
        QEMU 2.2.50 monitor - type 'help' for more information

    Terminal 2:

        $ vncviewer :0 

    Terminal 1:

        (qemu) change vnc :1

    Terminal 3:

        $ vncviewer :1

Before this patch, vncviewer works both times.  The second one kills the
first one.

After this patch, the first one still works, but the second one fails.
netstat shows nobody's listening on the port.

Speculation on possible cause inline.

Furthermore, the conversion to QemuOpts makes VNC visible in
-writeconfig, but if you -readconfig it back, it doesn't quite work.

With -display vnc=:0, -writeconfig produces

    [vnc]
      vnc = ":0"

If I append that to the config file I -readconfig, I a working VNC
display on :0 (good), but I also get an SDL display (not good).

> ---
>  include/ui/console.h |   4 +-
>  qmp.c                |  15 ++-
>  ui/vnc.c             | 270 ++++++++++++++++++++++++++++++++-------------------
>  vl.c                 |  42 +++-----
>  4 files changed, 199 insertions(+), 132 deletions(-)
>
> diff --git a/include/ui/console.h b/include/ui/console.h
> index 5ff2e27..887ed91 100644
> --- a/include/ui/console.h
> +++ b/include/ui/console.h
> @@ -328,12 +328,14 @@ void cocoa_display_init(DisplayState *ds, int full_screen);
>  
>  /* vnc.c */
>  void vnc_display_init(const char *id);
> -void vnc_display_open(const char *id, const char *display, Error **errp);
> +void vnc_display_open(const char *id, Error **errp);
>  void vnc_display_add_client(const char *id, int csock, bool skipauth);
>  char *vnc_display_local_addr(const char *id);
>  #ifdef CONFIG_VNC
>  int vnc_display_password(const char *id, const char *password);
>  int vnc_display_pw_expire(const char *id, time_t expires);
> +QemuOpts *vnc_parse_func(const char *str);
> +int vnc_init_func(QemuOpts *opts, void *opaque);
>  #else
>  static inline int vnc_display_password(const char *id, const char *password)
>  {
> diff --git a/qmp.c b/qmp.c
> index 0b4f131..963305c 100644
> --- a/qmp.c
> +++ b/qmp.c
> @@ -368,7 +368,20 @@ void qmp_change_vnc_password(const char *password, Error **errp)
>  
>  static void qmp_change_vnc_listen(const char *target, Error **errp)
>  {
> -    vnc_display_open(NULL, target, errp);
> +    QemuOptsList *olist = qemu_find_opts("vnc");
> +    QemuOpts *opts;
> +
> +    if (strstr(target, "id=")) {
> +        error_setg(errp, "id not supported");
> +        return;
> +    }

Aside: this is unclean.  Could we somehow test qemu_opts_id() instead?

> +

This deletes the QemuOpts with id=default:

> +    opts = qemu_opts_find(olist, "default");
> +    if (opts) {
> +        qemu_opts_del(opts);
> +    }

But this creates one without id:

> +    opts = vnc_parse_func(target);

The first argument orders vnc_display_open() to look for QemuOpts with
id=default, which doesn't exist anymore:

> +    vnc_display_open("default", errp);

>  }
>  
>  static void qmp_change_vnc(const char *target, bool has_arg, const char *arg,
[...]

Re: [Qemu-devel] [PATCH 04/10] vnc: switch to QemuOpts, allow multiple servers

[Markus Armbruster]

One more question...

Gerd Hoffmann <kraxel@redhat.com> writes:

> This patch switches vnc over to QemuOpts, and it (more or less
> as side effect) allows multiple vnc server instances.
>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  include/ui/console.h |   4 +-
>  qmp.c                |  15 ++-
>  ui/vnc.c             | 270 ++++++++++++++++++++++++++++++++-------------------
>  vl.c                 |  42 +++-----
>  4 files changed, 199 insertions(+), 132 deletions(-)
>
> diff --git a/include/ui/console.h b/include/ui/console.h
> index 5ff2e27..887ed91 100644
> --- a/include/ui/console.h
> +++ b/include/ui/console.h
> @@ -328,12 +328,14 @@ void cocoa_display_init(DisplayState *ds, int full_screen);
>  
>  /* vnc.c */
>  void vnc_display_init(const char *id);
> -void vnc_display_open(const char *id, const char *display, Error **errp);
> +void vnc_display_open(const char *id, Error **errp);
>  void vnc_display_add_client(const char *id, int csock, bool skipauth);
>  char *vnc_display_local_addr(const char *id);
>  #ifdef CONFIG_VNC
>  int vnc_display_password(const char *id, const char *password);
>  int vnc_display_pw_expire(const char *id, time_t expires);
> +QemuOpts *vnc_parse_func(const char *str);
> +int vnc_init_func(QemuOpts *opts, void *opaque);
>  #else
>  static inline int vnc_display_password(const char *id, const char *password)
>  {
> diff --git a/qmp.c b/qmp.c
> index 0b4f131..963305c 100644
> --- a/qmp.c
> +++ b/qmp.c
> @@ -368,7 +368,20 @@ void qmp_change_vnc_password(const char *password, Error **errp)
>  
>  static void qmp_change_vnc_listen(const char *target, Error **errp)
>  {
> -    vnc_display_open(NULL, target, errp);
> +    QemuOptsList *olist = qemu_find_opts("vnc");
> +    QemuOpts *opts;
> +
> +    if (strstr(target, "id=")) {
> +        error_setg(errp, "id not supported");
> +        return;
> +    }
> +
> +    opts = qemu_opts_find(olist, "default");
> +    if (opts) {
> +        qemu_opts_del(opts);
> +    }
> +    opts = vnc_parse_func(target);
> +    vnc_display_open("default", errp);

vnc_parse_func() can fail.  Shouldn't we keep the old display
configuration then?

>  }
>  
[...]

Re: [Qemu-devel] [PATCH 09/10] monitor: add query-vnc-servers command

[Eric Blake]

[-- Attachment #1: Type: text/plain, Size: 1004 bytes --]

On 01/12/2015 05:53 AM, Gerd Hoffmann wrote:
> Add new query vnc qmp command, for the lack of better ideas just name it
> "query-vnc-servers".  Changes over query-vnc:
> 
>  * It returns a list of vnc servers, so multiple vnc server instances
>    are covered.
>  * Each vnc server returns a list of server sockets.  Followup patch
>    will use that to also report websockets.  In case we add support for
>    multiple server sockets server sockets (to better support ipv4+ipv6

s/( server sockets){2}/\1/

>    dualstack) we can add them to the list too.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  qapi-schema.json |  68 ++++++++++++++++++++++++++++
>  qmp-commands.hx  |   5 +++
>  ui/vnc.c         | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 206 insertions(+)
> 

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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Re: [Qemu-devel] [PATCH 10/10] monitor: add vnc websockets

[Eric Blake]

[-- Attachment #1: Type: text/plain, Size: 510 bytes --]

On 01/12/2015 05:53 AM, Gerd Hoffmann wrote:
> Add websockets bool to VncBasicInfo, report websocket server sockets,
> flag websocket client connections.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  qapi-schema.json |  5 ++++-
>  ui/vnc.c         | 15 ++++++++++++---
>  2 files changed, 16 insertions(+), 4 deletions(-)
> 

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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Re: [Qemu-devel] [PATCH 04/10] vnc: switch to QemuOpts, allow multiple servers

[Gerd Hoffmann]

On Fr, 2015-02-13 at 19:25 +0100, Markus Armbruster wrote:
> Gerd Hoffmann <kraxel@redhat.com> writes:
> 
> > This patch switches vnc over to QemuOpts, and it (more or less
> > as side effect) allows multiple vnc server instances.
> >
> > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> 
> I'm afraid this broke monitor command change vnc.
> 
> Reproducer
> 
>     Terminal 1:
> 
>         $ qemu -nodefaults -S -display vnc=:0 -monitor stdio
>         QEMU 2.2.50 monitor - type 'help' for more information
> 
>     Terminal 2:
> 
>         $ vncviewer :0 
> 
>     Terminal 1:
> 
>         (qemu) change vnc :1
> 
>     Terminal 3:
> 
>         $ vncviewer :1
> 
> Before this patch, vncviewer works both times.  The second one kills the
> first one.
> 
> After this patch, the first one still works, but the second one fails.
> netstat shows nobody's listening on the port.

Fix for this is on the list already (Gonglei) and included in the
pending vnc pull request.

> Furthermore, the conversion to QemuOpts makes VNC visible in
> -writeconfig, but if you -readconfig it back, it doesn't quite work.
> 
> With -display vnc=:0, -writeconfig produces
> 
>     [vnc]
>       vnc = ":0"
> 
> If I append that to the config file I -readconfig, I a working VNC
> display on :0 (good), but I also get an SDL display (not good).

Will send a fix to the list in a moment.

cheers,
  Gerd

Re: [Qemu-devel] [PATCH 04/10] vnc: switch to QemuOpts, allow multiple servers

[Gerd Hoffmann]

  Hi,

> >  static void qmp_change_vnc_listen(const char *target, Error **errp)
> >  {
> > -    vnc_display_open(NULL, target, errp);
> > +    QemuOptsList *olist = qemu_find_opts("vnc");
> > +    QemuOpts *opts;
> > +
> > +    if (strstr(target, "id=")) {
> > +        error_setg(errp, "id not supported");
> > +        return;
> > +    }
> 
> Aside: this is unclean.  Could we somehow test qemu_opts_id() instead?

For that we would have to parse it first, which has some ugly corner
cases on id clashes ...

All I wanna do here is keep it alive for the existing use cases, without
support for multiple displays, with minimum effort.

Should we need support for vnc config change in a multiple vnc server
setup a new qmp monitor command should be designed for that.

cheers,
  Gerd

Re: [Qemu-devel] [PATCH 04/10] vnc: switch to QemuOpts, allow multiple servers

[Markus Armbruster]

Gerd Hoffmann <kraxel@redhat.com> writes:

>   Hi,
>
>> >  static void qmp_change_vnc_listen(const char *target, Error **errp)
>> >  {
>> > -    vnc_display_open(NULL, target, errp);
>> > +    QemuOptsList *olist = qemu_find_opts("vnc");
>> > +    QemuOpts *opts;
>> > +
>> > +    if (strstr(target, "id=")) {
>> > +        error_setg(errp, "id not supported");
>> > +        return;
>> > +    }
>> 
>> Aside: this is unclean.  Could we somehow test qemu_opts_id() instead?
>
> For that we would have to parse it first, which has some ugly corner
> cases on id clashes ...
>
> All I wanna do here is keep it alive for the existing use cases, without
> support for multiple displays, with minimum effort.
>
> Should we need support for vnc config change in a multiple vnc server
> setup a new qmp monitor command should be designed for that.

Fair enough.  Suggests that the QemuOpts API is lacking, though.