remote: Auto-allocate params in remoteDeserializeTypedParameters

remoteDeserializeTypedParameters can now be called with either
preallocated params array (size of which is announced by nparams) or it
can allocate params array according to the number of parameters received
from the server.

src/remote/remote_driver.c

@@ -1543,67 +1543,78 @@ static int
 remoteDeserializeTypedParameters(remote_typed_param *ret_params_val,
                                  u_int ret_params_len,
                                  int limit,
-                                 virTypedParameterPtr params,
+                                 virTypedParameterPtr *params,
                                  int *nparams)
 {
     int i = 0;
     int rv = -1;
+    bool userAllocated = *params != NULL;
 
-    /* Check the length of the returned list carefully. */
-    if (ret_params_len > limit || ret_params_len > *nparams) {
-        virReportError(VIR_ERR_RPC, "%s",
-                       _("returned number of parameters exceeds limit"));
-        goto cleanup;
+    if (userAllocated) {
+        /* Check the length of the returned list carefully. */
+        if (ret_params_len > limit || ret_params_len > *nparams) {
+            virReportError(VIR_ERR_RPC, "%s",
+                           _("returned number of parameters exceeds limit"));
+            goto cleanup;
+        }
+    } else {
+        if (VIR_ALLOC_N(*params, ret_params_len) < 0) {
+            virReportOOMError();
+            goto cleanup;
+        }
     }
-
     *nparams = ret_params_len;
 
     /* Deserialise the result. */
     for (i = 0; i < ret_params_len; ++i) {
-        if (virStrcpyStatic(params[i].field,
-                            ret_params_val[i].field) == NULL) {
+        virTypedParameterPtr param = *params + i;
+        remote_typed_param *ret_param = ret_params_val + i;
+
+        if (virStrcpyStatic(param->field,
+                            ret_param->field) == NULL) {
             virReportError(VIR_ERR_INTERNAL_ERROR,
                            _("Parameter %s too big for destination"),
-                           ret_params_val[i].field);
+                           ret_param->field);
             goto cleanup;
         }
-        params[i].type = ret_params_val[i].value.type;
-        switch (params[i].type) {
+
+        param->type = ret_param->value.type;
+        switch (param->type) {
         case VIR_TYPED_PARAM_INT:
-            params[i].value.i =
-                ret_params_val[i].value.remote_typed_param_value_u.i;
+            param->value.i =
+                ret_param->value.remote_typed_param_value_u.i;
             break;
         case VIR_TYPED_PARAM_UINT:
-            params[i].value.ui =
-                ret_params_val[i].value.remote_typed_param_value_u.ui;
+            param->value.ui =
+                ret_param->value.remote_typed_param_value_u.ui;
             break;
         case VIR_TYPED_PARAM_LLONG:
-            params[i].value.l =
-                ret_params_val[i].value.remote_typed_param_value_u.l;
+            param->value.l =
+                ret_param->value.remote_typed_param_value_u.l;
             break;
         case VIR_TYPED_PARAM_ULLONG:
-            params[i].value.ul =
-                ret_params_val[i].value.remote_typed_param_value_u.ul;
+            param->value.ul =
+                ret_param->value.remote_typed_param_value_u.ul;
             break;
         case VIR_TYPED_PARAM_DOUBLE:
-            params[i].value.d =
-                ret_params_val[i].value.remote_typed_param_value_u.d;
+            param->value.d =
+                ret_param->value.remote_typed_param_value_u.d;
             break;
         case VIR_TYPED_PARAM_BOOLEAN:
-            params[i].value.b =
-                ret_params_val[i].value.remote_typed_param_value_u.b;
+            param->value.b =
+                ret_param->value.remote_typed_param_value_u.b;
             break;
         case VIR_TYPED_PARAM_STRING:
-            params[i].value.s =
-                strdup(ret_params_val[i].value.remote_typed_param_value_u.s);
-            if (params[i].value.s == NULL) {
+            param->value.s =
+                strdup(ret_param->value.remote_typed_param_value_u.s);
+            if (!param->value.s) {
                 virReportOOMError();
                 goto cleanup;
             }
             break;
         default:
             virReportError(VIR_ERR_RPC, _("unknown parameter type: %d"),
-                           params[i].type);
+                           param->type);
             goto cleanup;
         }
     }
@@ -1611,8 +1622,14 @@ remoteDeserializeTypedParameters(remote_typed_param *ret_params_val,
     rv = 0;
 
 cleanup:
-    if (rv < 0)
-        virTypedParamsClear(params, i);
+    if (rv < 0) {
+        if (userAllocated) {
+            virTypedParamsClear(*params, i);
+        } else {
+            virTypedParamsFree(*params, i);
+            *params = NULL;
+        }
+    }
     return rv;
 }
 
@@ -1698,7 +1715,7 @@ remoteDomainBlockStatsFlags(virDomainPtr domain,
     if (remoteDeserializeTypedParameters(ret.params.params_val,
                                          ret.params.params_len,
                                          REMOTE_DOMAIN_MEMORY_PARAMETERS_MAX,
-                                         params,
+                                         &params,
                                          nparams) < 0)
         goto cleanup;
 
@@ -1746,7 +1763,7 @@ remoteDomainGetMemoryParameters(virDomainPtr domain,
     if (remoteDeserializeTypedParameters(ret.params.params_val,
                                          ret.params.params_len,
                                          REMOTE_DOMAIN_MEMORY_PARAMETERS_MAX,
-                                         params,
+                                         &params,
                                          nparams) < 0)
         goto cleanup;
 
@@ -1794,7 +1811,7 @@ remoteDomainGetNumaParameters(virDomainPtr domain,
     if (remoteDeserializeTypedParameters(ret.params.params_val,
                                          ret.params.params_len,
                                          REMOTE_DOMAIN_NUMA_PARAMETERS_MAX,
-                                         params,
+                                         &params,
                                          nparams) < 0)
         goto cleanup;
 
@@ -1842,7 +1859,7 @@ remoteDomainGetBlkioParameters(virDomainPtr domain,
     if (remoteDeserializeTypedParameters(ret.params.params_val,
                                          ret.params.params_len,
                                          REMOTE_DOMAIN_BLKIO_PARAMETERS_MAX,
-                                         params,
+                                         &params,
                                          nparams) < 0)
         goto cleanup;
 
@@ -2658,7 +2675,7 @@ static int remoteDomainGetBlockIoTune(virDomainPtr domain,
     if (remoteDeserializeTypedParameters(ret.params.params_val,
                                          ret.params.params_len,
                                          REMOTE_DOMAIN_MEMORY_PARAMETERS_MAX,
-                                         params,
+                                         &params,
                                          nparams) < 0)
         goto cleanup;
 
@@ -2742,12 +2759,12 @@ static int remoteDomainGetCPUStats(virDomainPtr domain,
     ncpus = ret.params.params_len / ret.nparams;
     for (cpu = 0; cpu < ncpus; cpu++) {
         int tmp = nparams;
+        virTypedParameterPtr cpu_params = &params[cpu * nparams];
         remote_typed_param *stride = &ret.params.params_val[cpu * ret.nparams];
 
         if (remoteDeserializeTypedParameters(stride, ret.nparams,
                                              REMOTE_NODE_CPU_STATS_MAX,
-                                             &params[cpu * nparams],
-                                             &tmp) < 0)
+                                             &cpu_params, &tmp) < 0)
             goto cleanup;
     }
 
@@ -5648,7 +5665,7 @@ remoteDomainGetInterfaceParameters(virDomainPtr domain,
     if (remoteDeserializeTypedParameters(ret.params.params_val,
                                          ret.params.params_len,
                                          REMOTE_DOMAIN_INTERFACE_PARAMETERS_MAX,
-                                         params,
+                                         &params,
                                          nparams) < 0)
         goto cleanup;
 
@@ -5822,7 +5839,7 @@ remoteNodeGetMemoryParameters(virConnectPtr conn,
     if (remoteDeserializeTypedParameters(ret.params.params_val,
                                          ret.params.params_len,
                                          REMOTE_NODE_MEMORY_PARAMETERS_MAX,
-                                         params,
+                                         &params,
                                          nparams) < 0)
         goto cleanup;
 

src/rpc/gendispatch.pl

@@ -1343,7 +1343,7 @@ elsif ($opt_k) {
                     push(@ret_list2, "if (remoteDeserializeTypedParameters(ret.$1.$1_val,\n" .
                                      "                                         ret.$1.$1_len,\n" .
                                      "                                         $2,\n" .
-                                     "                                         $1,\n" .
+                                     "                                         &$1,\n" .
                                      "                                         n$1) < 0)\n" .
                                      "        goto cleanup;\n");
                     $single_ret_cleanup = 1;