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[libvirt] [PATCHv3 3/5] domifaddr: Implement the API for qemu



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  | 157 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/qemu/qemu_agent.h  |   3 +
 src/qemu/qemu_driver.c |  55 +++++++++++++++++
 tests/qemuagenttest.c  |  90 +++++++++++++++++++++++++++-
 4 files changed, 304 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_agent.c b/src/qemu/qemu_agent.c
index 2cd0ccc..015e752 100644
--- a/src/qemu/qemu_agent.c
+++ b/src/qemu/qemu_agent.c
@@ -844,6 +844,7 @@ static int qemuAgentSend(qemuAgentPtr mon,
         VIR_DEBUG("Attempt to send command while error is set %s",
                   NULLSTR(mon->lastError.message));
         virSetError(&mon->lastError);
+        printf("Upper\n");
         return -1;
     }
 
@@ -862,6 +863,7 @@ static int qemuAgentSend(qemuAgentPtr mon,
     while (!mon->msg->finished) {
         if ((then && virCondWaitUntil(&mon->notify, &mon->parent.lock, then) < 0) ||
             (!then && virCondWait(&mon->notify, &mon->parent.lock) < 0)) {
+
             if (errno == ETIMEDOUT) {
                 virReportError(VIR_ERR_AGENT_UNRESPONSIVE, "%s",
                                _("Guest agent not available for now"));
@@ -1319,6 +1321,161 @@ cleanup:
     return ret;
 }
 
+
+int
+qemuAgentGetInterfaces(qemuAgentPtr mon,
+                       virDomainInterfacePtr **ifaces)
+{
+    int ret = -1;
+    size_t i, j;
+    int size = -1;
+    virJSONValuePtr cmd = NULL;
+    virJSONValuePtr reply = NULL;
+    virJSONValuePtr ret_array = NULL;
+    int ifaces_count = 0;
+    virDomainInterfacePtr *ifaces_ret = NULL;
+
+    if (!(cmd = qemuAgentMakeCommand("guest-network-get-interfaces", NULL)))
+       return -1;
+
+    if (qemuAgentCommand(mon, cmd, &reply, VIR_DOMAIN_QEMU_AGENT_COMMAND_BLOCK) < 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_ret, 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;
+
+        if (VIR_ALLOC(ifaces_ret[i]) < 0)
+            goto cleanup;
+
+        /* 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 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 error;
+        }
+
+        if (VIR_STRDUP(ifaces_ret[i]->name, name) < 0)
+            goto error;
+
+        /* hwaddr might be omitted */
+        hwaddr = virJSONValueObjectGetString(tmp_iface, "hardware-address");
+        if (hwaddr && VIR_STRDUP(ifaces_ret[i]->hwaddr, hwaddr) < 0)
+            goto error;
+
+        /* 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_ret)[i]).naddrs = (unsigned int) ip_addr_arr_size;
+
+        if (VIR_ALLOC_N((*(ifaces_ret)[i]).addrs, ip_addr_arr_size) < 0)
+            goto error;
+
+        for (j = 0; j < ip_addr_arr_size; j++) {
+            virJSONValuePtr ip_addr_obj = virJSONValueArrayGet(ip_addr_arr, j);
+            virDomainIPAddressPtr ip_addr = &ifaces_ret[i]->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 error;
+            }
+
+            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 error;
+            } 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 error;
+            }
+
+            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 error;
+            }
+            if (VIR_STRDUP(ip_addr->addr, addr) < 0)
+                goto error;
+
+            if (virJSONValueObjectGetNumberInt(ip_addr_obj, "prefix",
+                                               &ip_addr->prefix) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                                _("malformed 'prefix' field"));
+                goto error;
+            }
+        }
+    }
+
+    *ifaces = ifaces_ret;
+    ifaces_ret = NULL;
+    ret = ifaces_count;
+
+cleanup:
+    virJSONValueFree(cmd);
+    virJSONValueFree(reply);
+    return ret;
+
+error:
+    if (ifaces_ret) {
+        for (i = 0; i < ifaces_count; i++) {
+            if (ifaces_ret[i])
+                virDomainInterfaceFree(ifaces_ret[i]);
+        }
+    }
+    VIR_FREE(ifaces_ret);
+    goto cleanup;
+}
+
+
 /*
  * qemuAgentFSThaw:
  * @mon: Agent
diff --git a/src/qemu/qemu_agent.h b/src/qemu/qemu_agent.h
index 5fbacdb..58b56fd 100644
--- a/src/qemu/qemu_agent.h
+++ b/src/qemu/qemu_agent.h
@@ -76,6 +76,9 @@ int qemuAgentFSThaw(qemuAgentPtr mon);
 int qemuAgentSuspend(qemuAgentPtr mon,
                      unsigned int target);
 
+int qemuAgentGetInterfaces(qemuAgentPtr mon,
+                           virDomainInterfacePtr **ifaces);
+
 int qemuAgentArbitraryCommand(qemuAgentPtr mon,
                               const char *cmd,
                               char **result,
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 0a8e518..0cd266f 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -16035,6 +16035,60 @@ qemuNodeSuspendForDuration(virConnectPtr conn,
     return nodeSuspendForDuration(target, duration, flags);
 }
 
+static int
+qemuDomainInterfacesAddresses(virDomainPtr dom,
+                              virDomainInterfacePtr **ifaces,
+                              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 cleanup;
+    }
+
+    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);
+    qemuDomainObjExitAgent(vm);
+
+    if (qemuDomainObjEndJob(driver, vm) == 0)
+        vm = NULL;
+
+cleanup:
+    if (vm)
+        virObjectUnlock(vm);
+    return ret;
+}
 
 static virDriver qemuDriver = {
     .no = VIR_DRV_QEMU,
@@ -16130,6 +16184,7 @@ 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 */
diff --git a/tests/qemuagenttest.c b/tests/qemuagenttest.c
index 4e27981..6b6c47f 100644
--- a/tests/qemuagenttest.c
+++ b/tests/qemuagenttest.c
@@ -31,6 +31,8 @@
 
 #define VIR_FROM_THIS VIR_FROM_NONE
 
+
+
 static int
 testQemuAgentFSFreeze(const void *data)
 {
@@ -271,6 +273,7 @@ cleanup:
 }
 
 
+
 static int
 testQemuAgentShutdown(const void *data)
 {
@@ -496,7 +499,7 @@ testQemuAgentArbitraryCommand(const void *data)
         goto cleanup;
 
     if (qemuAgentArbitraryCommand(qemuMonitorTestGetAgent(test),
-                                  "{\"execute\":\"ble\"}",
+                                 "{\"execute\":\"ble\"}",
                                   &reply,
                                   VIR_DOMAIN_QEMU_AGENT_COMMAND_BLOCK) < 0)
         goto cleanup;
@@ -576,6 +579,90 @@ cleanup:
     return ret;
 }
 
+static const char testQemuAgentGetInterfacesResponse[] =
+    "{\"return\": "
+    "    ["
+    "       {\"name\":\"lo\","
+    "        \"ip-addresses\":"
+    "          ["
+    "             {\"ip-address-type\":\"ipv4\","
+    "              \"ip-address\":\"127.0.0.1\","
+    "              \"prefix\":8"
+    "             },"
+    "             {\"ip-address-type\":\"ipv6\","
+    "              \"ip-address\":\"::1\","
+    "              \"prefix\":128"
+    "             }"
+    "          ],"
+    "        \"hardware-address\":\"00:00:00:00:00:00\""
+    "       },"
+    "       {\"name\":\"eth0\","
+    "        \"ip-addresses\":"
+    "          ["
+    "             {\"ip-address-type\":\"ipv4\","
+    "              \"ip-address\":\"192.168.102.142\","
+    "              \"prefix\":24"
+    "             },"
+    "             {\"ip-address-type\":\"ipv6\","
+    "              \"ip-address\":\"fe80::5054:ff:fe89:ad35\","
+    "              \"prefix\":64"
+    "             }"
+    "          ],"
+    "        \"hardware-address\":\"52:54:00:89:ad:35\""
+    "       },"
+    "       {\"name\":\"eth1\","
+    "        \"ip-addresses\":"
+    "          ["
+    "             {\"ip-address-type\":\"ipv4\","
+    "              \"ip-address\":\"192.168.103.83\","
+    "              \"prefix\":24"
+    "             },"
+    "             {\"ip-address-type\":\"ipv6\","
+    "              \"ip-address\":\"fe80::5054:ff:fed3:39ee\","
+    "              \"prefix\":64"
+    "             }"
+    "          ],"
+    "        \"hardware-address\":\"52:54:00:d3:39:ee\""
+    "       }"
+    "    ]"
+    "}";
+
+static int
+testQemuAgentGetInterfaces(const void *data)
+{
+    virDomainXMLOptionPtr xmlopt = (virDomainXMLOptionPtr)data;
+    qemuMonitorTestPtr test = qemuMonitorTestNewAgent(xmlopt);
+    int ret = -1;
+    int ifaces_count = 0;
+    virDomainInterfacePtr *ifaces;
+
+    if (!test)
+        return -1;
+
+    if (qemuMonitorTestAddAgentSyncResponse(test) < 0)
+        goto cleanup;
+
+    if (qemuMonitorTestAddItem(test, "guest-network-get-interfaces",
+                               testQemuAgentGetInterfacesResponse) < 0)
+        goto cleanup;
+
+    if ((ifaces_count = qemuAgentGetInterfaces(qemuMonitorTestGetAgent(test),
+                                               &ifaces)) < 0) {
+        goto cleanup;
+    }
+
+    if (ifaces_count != 3) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       "expected 3 interfaces, got %d", ret);
+        goto cleanup;
+    }
+
+    ret = 0;
+
+cleanup:
+    qemuMonitorTestFree(test);
+    return ret;
+}
 
 static int
 mymain(void)
@@ -605,6 +692,7 @@ mymain(void)
     DO_TEST(Shutdown);
     DO_TEST(CPU);
     DO_TEST(ArbitraryCommand);
+    DO_TEST(GetInterfaces);
 
     DO_TEST(Timeout); /* Timeout should always be called last */
 
-- 
1.7.11.7


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