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https://gitlab.com/libvirt/libvirt.git
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Implement VNC password change in QEMU
Use the new virDomainUpdateDeviceFlags API to allow the VNC password to be changed on the fly * src/internal.h: Define STREQ_NULLABLE() which is like STREQ() but does not crash if either argument is NULL, and treats two NULLs as equal. * src/libvirt_private.syms: Export virDomainGraphicsTypeToString * src/qemu/qemu_driver.c: Support VNC password change on a live machine * src/qemu/qemu_monitor.c: Disable crazy debugging info. Treat a NULL password as "" (empty string), allowing passwords to be disabled in the monitor
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@ -58,6 +58,12 @@
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# define STRCASENEQLEN(a,b,n) (strncasecmp(a,b,n) != 0)
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# define STRPREFIX(a,b) (strncmp(a,b,strlen(b)) == 0)
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# define STREQ_NULLABLE(a, b) \
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((!(a) && !(b)) || ((a) && (b) && STREQ((a), (b))))
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# define STRNEQ_NULLABLE(a, b) \
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((!(a) ^ !(b)) || ((a) && (b) && STRNEQ((a), (b))))
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# define NUL_TERMINATE(buf) do { (buf)[sizeof(buf)-1] = '\0'; } while (0)
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# define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))
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@ -139,6 +139,7 @@ virDomainFindByName;
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virDomainFindByUUID;
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virDomainGetRootFilesystem;
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virDomainGraphicsTypeFromString;
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virDomainGraphicsTypeToString;
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virDomainGraphicsDefFree;
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virDomainHostdevDefFree;
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virDomainHostdevModeTypeToString;
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@ -7046,6 +7046,83 @@ static int qemudDomainAttachDeviceFlags(virDomainPtr dom,
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}
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static virDomainGraphicsDefPtr qemuDomainFindGraphics(virDomainObjPtr vm,
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virDomainGraphicsDefPtr dev)
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{
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int i;
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for (i = 0 ; i < vm->def->ngraphics ; i++) {
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if (vm->def->graphics[i]->type == dev->type)
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return vm->def->graphics[i];
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}
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return NULL;
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}
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static int
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qemuDomainChangeGraphics(struct qemud_driver *driver,
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virDomainObjPtr vm,
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virDomainGraphicsDefPtr dev)
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{
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virDomainGraphicsDefPtr olddev = qemuDomainFindGraphics(vm, dev);
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qemuDomainObjPrivatePtr priv = vm->privateData;
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int ret = -1;
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if (!olddev) {
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qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("cannot find existing graphics device to modify"));
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return -1;
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}
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switch (dev->type) {
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case VIR_DOMAIN_GRAPHICS_TYPE_VNC:
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if ((olddev->data.vnc.autoport != dev->data.vnc.autoport) ||
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(!dev->data.vnc.autoport && (olddev->data.vnc.port != dev->data.vnc.port))) {
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qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("cannot change port settings on vnc graphics"));
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return -1;
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}
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if (STRNEQ_NULLABLE(olddev->data.vnc.listenAddr, dev->data.vnc.listenAddr)) {
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qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("cannot change listen address setting on vnc graphics"));
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return -1;
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}
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if (STRNEQ_NULLABLE(olddev->data.vnc.keymap, dev->data.vnc.keymap)) {
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qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("cannot change keymap setting on vnc graphics"));
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return -1;
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}
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if (STRNEQ_NULLABLE(olddev->data.vnc.passwd, dev->data.vnc.passwd)) {
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VIR_DEBUG("Updating password on VNC server %p %p", dev->data.vnc.passwd, driver->vncPassword);
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qemuDomainObjEnterMonitorWithDriver(driver, vm);
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ret = qemuMonitorSetVNCPassword(priv->mon,
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dev->data.vnc.passwd ?
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dev->data.vnc.passwd :
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driver->vncPassword);
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qemuDomainObjExitMonitorWithDriver(driver, vm);
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/* Steal the new dev's char * reference */
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VIR_FREE(olddev->data.vnc.passwd);
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olddev->data.vnc.passwd = dev->data.vnc.passwd;
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dev->data.vnc.passwd = NULL;
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} else {
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ret = 0;
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}
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break;
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default:
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qemuReportError(VIR_ERR_INTERNAL_ERROR,
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_("unable to change config on '%s' graphics type"),
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virDomainGraphicsTypeToString(dev->type));
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break;
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}
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return ret;
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}
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static int qemuDomainUpdateDeviceFlags(virDomainPtr dom,
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const char *xml,
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unsigned int flags)
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@ -7134,6 +7211,10 @@ static int qemuDomainUpdateDeviceFlags(virDomainPtr dom,
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}
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break;
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case VIR_DOMAIN_DEVICE_GRAPHICS:
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ret = qemuDomainChangeGraphics(driver, vm, dev->data.graphics);
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break;
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default:
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qemuReportError(VIR_ERR_NO_SUPPORT,
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_("disk device type '%s' cannot be updated"),
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@ -39,7 +39,8 @@
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#define VIR_FROM_THIS VIR_FROM_QEMU
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#define QEMU_DEBUG_RAW_IO 0
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#define DEBUG_IO 0
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#define DEBUG_RAW_IO 0
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struct _qemuMonitor {
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virMutex lock;
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@ -302,7 +303,8 @@ qemuMonitorIOProcess(qemuMonitorPtr mon)
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if (mon->msg && mon->msg->txOffset == mon->msg->txLength)
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msg = mon->msg;
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#if QEMU_DEBUG_RAW_IO
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#if DEBUG_IO
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#if DEBUG_RAW_IO
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char *str1 = qemuMonitorEscapeNonPrintable(msg ? msg->txBuffer : "");
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char *str2 = qemuMonitorEscapeNonPrintable(mon->buffer);
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VIR_ERROR("Process %d %p %p [[[[%s]]][[[%s]]]", (int)mon->bufferOffset, mon->msg, msg, str1, str2);
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@ -311,6 +313,8 @@ qemuMonitorIOProcess(qemuMonitorPtr mon)
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#else
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VIR_DEBUG("Process %d", (int)mon->bufferOffset);
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#endif
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#endif
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if (mon->json)
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len = qemuMonitorJSONIOProcess(mon,
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mon->buffer, mon->bufferOffset,
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@ -332,7 +336,9 @@ qemuMonitorIOProcess(qemuMonitorPtr mon)
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VIR_FREE(mon->buffer);
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mon->bufferOffset = mon->bufferLength = 0;
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}
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#if DEBUG_IO
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VIR_DEBUG("Process done %d used %d", (int)mon->bufferOffset, len);
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#endif
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if (msg && msg->finished)
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virCondBroadcast(&mon->notify);
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return len;
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@ -455,7 +461,9 @@ qemuMonitorIORead(qemuMonitorPtr mon)
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mon->buffer[mon->bufferOffset] = '\0';
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}
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#if DEBUG_IO
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VIR_DEBUG("Now read %d bytes of data", (int)mon->bufferOffset);
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#endif
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return ret;
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}
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@ -485,7 +493,9 @@ qemuMonitorIO(int watch, int fd, int events, void *opaque) {
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qemuMonitorLock(mon);
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qemuMonitorRef(mon);
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#if DEBUG_IO
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VIR_DEBUG("Monitor %p I/O on watch %d fd %d events %d", mon, watch, fd, events);
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#endif
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if (mon->fd != fd || mon->watch != watch) {
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VIR_ERROR("event from unexpected fd %d!=%d / watch %d!=%d", mon->fd, fd, mon->watch, watch);
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@ -981,6 +991,9 @@ int qemuMonitorSetVNCPassword(qemuMonitorPtr mon,
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int ret;
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DEBUG("mon=%p, fd=%d", mon, mon->fd);
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if (!password)
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password = "";
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if (mon->json)
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ret = qemuMonitorJSONSetVNCPassword(mon, password);
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else
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