On 24/07/13 19:07, nehaljwani wrote:
By querying the qemu guest agent with the QMP command
"guest-network-get-interfaces" and converting the received
JSON output to structured objects.
src/qemu/qemu_agent.h:
* Define qemuAgentGetInterfaces
src/qemu/qemu_agent.c:
* Implement qemuAgentGetInterface
src/qemu/qemu_driver.c:
* New function qemuDomainInterfacesAddresses
src/remote_protocol-sructs:
* Define new structs
---
src/qemu/qemu_agent.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_agent.h | 4 ++
src/qemu/qemu_driver.c | 57 +++++++++++++++++++
3 files changed, 211 insertions(+)
diff --git a/src/qemu/qemu_agent.c b/src/qemu/qemu_agent.c
index 72bf211..6889195 100644
--- a/src/qemu/qemu_agent.c
+++ b/src/qemu/qemu_agent.c
@@ -1323,6 +1323,156 @@ cleanup:
return ret;
}
+
+int
+qemuAgentGetInterfaces(qemuAgentPtr mon,
+ virDomainInterfacePtr *ifaces,
+ unsigned int *ifaces_count)
+{
+ int ret = -1;
+ size_t i, j;
+ int size = -1;
+ virJSONValuePtr cmd;
+ virJSONValuePtr reply = NULL;
+ virJSONValuePtr ret_array = NULL;
+
+ cmd = qemuAgentMakeCommand("guest-network-get-interfaces", NULL);
+
+ if (!cmd)
+ return -1;
+
+ if (qemuAgentCommand(mon, cmd, &reply, 1) < 0 ||
+ qemuAgentCheckError(cmd, reply) < 0)
+ goto cleanup;
+
+ if (!(ret_array = virJSONValueObjectGet(reply, "return"))) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("qemu agent didn't provide 'return' field"));
+ goto cleanup;
+ }
+
+ if ((size = virJSONValueArraySize(ret_array)) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("qemu agent didn't return an array of interfaces"));
+ goto cleanup;
+ }
+
+ *ifaces_count = (unsigned int) size;
+
+ if (VIR_ALLOC_N(*ifaces, size) < 0)
+ goto cleanup;
+
+ for (i = 0; i < size; i++) {
+ virJSONValuePtr tmp_iface = virJSONValueArrayGet(ret_array, i);
+ virJSONValuePtr ip_addr_arr = NULL;
+ const char *name, *hwaddr;
+ int ip_addr_arr_size;
+
+ /* Shouldn't happen but doesn't hurt to check neither */
+ if (!tmp_iface) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("something has went really wrong"));
+ goto cleanup;
see [1], from here, it should be changed into:
goto error;
+ }
+
+ /* interface name is required to be presented */
+ name = virJSONValueObjectGetString(tmp_iface, "name");
+ if (!name) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("qemu agent didn't provide 'name' field"));
+ goto cleanup;
+ }
+
+ if (VIR_STRDUP((*ifaces)[i].name, name) < 0)
+ goto cleanup;
+
+ /* hwaddr might be omitted */
+ hwaddr = virJSONValueObjectGetString(tmp_iface, "hardware-address");
+ if (hwaddr && VIR_STRDUP((*ifaces)[i].hwaddr, hwaddr) < 0)
+ goto cleanup;
+
+ /* as well as IP address which - moreover -
+ * can be presented multiple times */
+ ip_addr_arr = virJSONValueObjectGet(tmp_iface, "ip-addresses");
+ if (!ip_addr_arr)
+ continue;
+
+ if ((ip_addr_arr_size = virJSONValueArraySize(ip_addr_arr)) < 0)
+ /* Mmm, empty 'ip-address'? */
+ continue;
+
+ (*ifaces)[i].ip_addrs_count = (unsigned int) ip_addr_arr_size;
+
+ if (VIR_ALLOC_N((*ifaces)[i].ip_addrs, ip_addr_arr_size) < 0)
+ goto cleanup;
+
+ for (j = 0; j < ip_addr_arr_size; j++) {
+ virJSONValuePtr ip_addr_obj = virJSONValueArrayGet(ip_addr_arr, j);
+ virDomainIPAddressPtr ip_addr = &(*ifaces)[i].ip_addrs[j];
+ const char *type, *addr;
+
+ /* Shouldn't happen but doesn't hurt to check neither */
+ if (!ip_addr_obj) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("something has went really wrong"));
+ goto cleanup;
+ }
+
+ type = virJSONValueObjectGetString(ip_addr_obj, "ip-address-type");
+ if (!type) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("qemu agent didn't provide 'ip-address-type'"
+ " field for interface '%s'"), name);
+ goto cleanup;
+ } else if (STREQ(type, "ipv4")) {
+ ip_addr->type = VIR_IP_ADDR_TYPE_IPV4;
+ } else if (STREQ(type, "ipv6")) {
+ ip_addr->type = VIR_IP_ADDR_TYPE_IPV6;
+ } else {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("unknown ip address type '%s'"),
+ type);
+ goto cleanup;
+ }
+
+ addr = virJSONValueObjectGetString(ip_addr_obj, "ip-address");
+ if (!addr) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("qemu agent didn't provide 'ip-address'"
+ " field for interface '%s'"), name);
+ goto cleanup;
+ }
+ if (VIR_STRDUP(ip_addr->addr, addr) < 0)
+ goto cleanup;
+
+ if (virJSONValueObjectGetNumberInt(ip_addr_obj, "prefix",
+ &ip_addr->prefix) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("malformed 'prefix' field"));
+ goto cleanup;
+ }
+ }
+ }
+
+ ret = 0;
+
+cleanup:
+ if (ret < 0 && *ifaces && size> 0) {
+ for (i = 0; i < size; i++) {
+ VIR_FREE((*ifaces)[i].name);
+ VIR_FREE((*ifaces)[i].hwaddr);
+ for (j = 0; j < (*ifaces)[i].ip_addrs_count; j++)
+ VIR_FREE((*ifaces)[i].ip_addrs[j].addr);
+ VIR_FREE((*ifaces)[i].ip_addrs);
+ }
+ VIR_FREE(*ifaces);
+ }
[1]
using two lables here will make things more clear, e.g.
ret = 0;
cleanup:
virJSONValueFree(cmd);
virJSONValueFree(reply);
return ret;
error:
for (i = 0; i < *ifaces_count; i++) {
/* free the stuffs here */
}
goto cleanup;
Note that I use "*ifaces_count" instead of "size", they have same value, but
"*ifaces_count" makes more sense, it make the code more readable, as you
are freeing the *ifaces.
Also you don't need to do checking like the old code, *ifaces must be not
NULL as long as the code go through to "error" label.
+ virJSONValueFree(cmd);
+ virJSONValueFree(reply);
+ return ret;
+}
+
+
/*
* qemuAgentFSThaw:
* @mon: Agent
diff --git a/src/qemu/qemu_agent.h b/src/qemu/qemu_agent.h
index cf70653..4afc028 100644
--- a/src/qemu/qemu_agent.h
+++ b/src/qemu/qemu_agent.h
@@ -76,6 +76,10 @@ int qemuAgentFSThaw(qemuAgentPtr mon);
int qemuAgentSuspend(qemuAgentPtr mon,
unsigned int target);
+int qemuAgentGetInterfaces(qemuAgentPtr mon,
+ virDomainInterfacePtr *ifaces,
+ unsigned int *ifaces_count);
+
int qemuAgentArbitraryCommand(qemuAgentPtr mon,
const char *cmd,
char **result,
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 96f87cd..1d204dc 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -16050,6 +16050,62 @@ qemuNodeSuspendForDuration(virConnectPtr conn,
return nodeSuspendForDuration(target, duration, flags);
}
+static int
+qemuDomainInterfacesAddresses(virDomainPtr dom,
+ virDomainInterfacePtr *ifaces,
+ unsigned int *ifaces_count,
+ unsigned int flags)
+{
+ virQEMUDriverPtr driver = dom->conn->privateData;
+ qemuDomainObjPrivatePtr priv = NULL;
+ virDomainObjPtr vm = NULL;
+ int ret = -1;
+
+ virCheckFlags(0, -1);
+
+ if (!(vm = qemuDomObjFromDomain(dom)))
+ goto cleanup;
+
+ if (!virDomainObjIsActive(vm)) {
+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+ _("domain is not running"));
+ goto endjob;
+ }
+
+ priv = vm->privateData;
+
+ if (virDomainInterfacesAddressesEnsureACL(dom->conn, vm->def) < 0)
+ goto cleanup;
+
+ if (priv->agentError) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("QEMU guest agent is not "
+ "available due to an error"));
+ goto cleanup;
+ }
+
+ if (!priv->agent) {
+ virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
+ _("QEMU guest agent is not configured"));
+ goto cleanup;
+ }
+
+ if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_QUERY) < 0)
+ goto cleanup;
+
+ qemuDomainObjEnterAgent(vm);
+ ret = qemuAgentGetInterfaces(priv->agent, ifaces, ifaces_count);
+ qemuDomainObjExitAgent(vm);
+
+endjob:
+ if (qemuDomainObjEndJob(driver, vm) == 0)
+ vm = NULL;
"endjob" label is never used. simply removeing it is fine.
+
+cleanup:
+ if (vm)
+ virObjectUnlock(vm);
+ return ret;
+}
static virDriver qemuDriver = {
.no = VIR_DRV_QEMU,
@@ -16145,6 +16201,7 @@ static virDriver qemuDriver = {
.domainMemoryPeek = qemuDomainMemoryPeek, /* 0.4.4 */
.domainGetBlockInfo = qemuDomainGetBlockInfo, /* 0.8.1 */
.nodeGetCPUStats = qemuNodeGetCPUStats, /* 0.9.3 */
+ .domainInterfacesAddresses = qemuDomainInterfacesAddresses, /* 1.1.2 */
.nodeGetMemoryStats = qemuNodeGetMemoryStats, /* 0.9.3 */
.nodeGetCellsFreeMemory = qemuNodeGetCellsFreeMemory, /* 0.4.4 */
.nodeGetFreeMemory = qemuNodeGetFreeMemory, /* 0.4.4 */
--
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