net-dhcp-leases: Implement the remote protocol

Implement RPC calls for virNetworkGetDHCPLeases, virNetworkGetDHCPLeasesForMAC

daemon/remote.c
   * Define remoteSerializeNetworkDHCPLeases,
            remoteDispatchNetworkGetDHCPLeases
   * Define remoteDispatchNetworkGetDHCPLeasesForMAC
   * Define helper function remoteSerializeDHCPLease

src/remote/remote_driver.c
   * Define remoteNetworkGetDHCPLeases
   * Define remoteNetworkGetDHCPLeasesForMAC
   * Define helper function remoteSerializeDHCPLease

src/remote/remote_protocol.x
   * New RPC procedure: REMOTE_PROC_NETWORK_GET_DHCP_LEASES
   * Define structs remote_network_dhcp_leases, remote_network_get_dhcp_leases_args,
                    remote_network_get_dhcp_leases_ret
   * New RPC procedure: REMOTE_PROC_NETWORK_GET_DHCP_LEASES_FOR_MAC
   * Define structs remote_network_dhcp_leases_for_mac, remote_network_get_dhcp_leases_for_mac_args,
                    remote_network_get_dhcp_leases_for_mac_ret

src/remote_protocol-structs
   * New structs added

src/rpc/gendispatch.pl
   * Add exception (s/Dhcp/DHCP) for auto-generating names of the remote functions
     in daemon/remote_dispatch.h

daemon/remote.c

@@ -6202,7 +6202,190 @@ remoteDispatchNodeGetFreePages(virNetServerPtr server ATTRIBUTE_UNUSED,
         VIR_FREE(ret->counts.counts_val);
     }
     return rv;
+}
+
+/* Copy contents of virNetworkDHCPLeasePtr to remote_network_dhcp_lease */
+static int
+remoteSerializeDHCPLease(remote_network_dhcp_lease *lease_dst, virNetworkDHCPLeasePtr lease_src)
+{
+    char **mac_tmp = NULL;
+    char **iaid_tmp = NULL;
+    char **hostname_tmp = NULL;
+    char **clientid_tmp = NULL;
+
+    if (VIR_ALLOC(mac_tmp) < 0 ||
+        VIR_ALLOC(iaid_tmp) < 0 ||
+        VIR_ALLOC(hostname_tmp) < 0 ||
+        VIR_ALLOC(clientid_tmp) < 0)
+        goto error;
+
+    lease_dst->expirytime = lease_src->expirytime;
+    lease_dst->type = lease_src->type;
+    lease_dst->prefix = lease_src->prefix;
+
+    if (VIR_STRDUP(lease_dst->interface, lease_src->interface) < 0 ||
+        VIR_STRDUP(lease_dst->ipaddr, lease_src->ipaddr) < 0 ||
+        VIR_STRDUP(*mac_tmp, lease_src->mac) < 0 ||
+        VIR_STRDUP(*iaid_tmp, lease_src->iaid) < 0 ||
+        VIR_STRDUP(*hostname_tmp, lease_src->hostname) < 0 ||
+        VIR_STRDUP(*clientid_tmp, lease_src->clientid) < 0)
+        goto error;
+
+    lease_dst->mac = *mac_tmp ? mac_tmp : NULL;
+    lease_dst->iaid = *iaid_tmp ? iaid_tmp : NULL;
+    lease_dst->hostname = *hostname_tmp ? hostname_tmp : NULL;
+    lease_dst->clientid = *clientid_tmp ? clientid_tmp : NULL;
+
+    return 0;
+
+ error:
+    VIR_FREE(*mac_tmp);
+    VIR_FREE(*iaid_tmp);
+    VIR_FREE(*hostname_tmp);
+    VIR_FREE(*clientid_tmp);
+    VIR_FREE(mac_tmp);
+    VIR_FREE(iaid_tmp);
+    VIR_FREE(hostname_tmp);
+    VIR_FREE(clientid_tmp);
+    VIR_FREE(lease_dst->ipaddr);
+    VIR_FREE(lease_dst->interface);
+    return -1;
+}
+
+
+static int
+remoteDispatchNetworkGetDHCPLeases(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                   virNetServerClientPtr client,
+                                   virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                   virNetMessageErrorPtr rerr,
+                                   remote_network_get_dhcp_leases_args *args,
+                                   remote_network_get_dhcp_leases_ret *ret)
+{
+    int rv = -1;
+    size_t i;
+    struct daemonClientPrivate *priv = virNetServerClientGetPrivateData(client);
+    virNetworkDHCPLeasePtr *leases = NULL;
+    virNetworkPtr net = NULL;
+    int nleases = 0;
 
+    if (!priv->conn) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("connection not open"));
+        goto cleanup;
+    }
+
+    if (!(net = get_nonnull_network(priv->conn, args->net)))
+        goto cleanup;
+
+    if ((nleases = virNetworkGetDHCPLeases(net,
+                                           args->need_results ? &leases : NULL,
+                                           args->flags)) < 0)
+        goto cleanup;
+
+    if (nleases > REMOTE_NETWORK_DHCP_LEASES_MAX) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Number of leases is %d, which exceeds max limit: %d"),
+                       nleases, REMOTE_NETWORK_DHCP_LEASES_MAX);
+        goto cleanup;
+    }
+
+    if (leases && nleases) {
+        if (VIR_ALLOC_N(ret->leases.leases_val, nleases) < 0)
+            goto cleanup;
+
+        ret->leases.leases_len = nleases;
+
+        for (i = 0; i < nleases; i++) {
+            if (remoteSerializeDHCPLease(ret->leases.leases_val + i, leases[i]) < 0)
+                goto cleanup;
+        }
+
+    } else {
+        ret->leases.leases_len = 0;
+        ret->leases.leases_val = NULL;
+    }
+
+    ret->ret = nleases;
+
+    rv = 0;
+
+ cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    if (leases) {
+        for (i = 0; i < nleases; i++)
+            virNetworkDHCPLeaseFree(leases[i]);
+        VIR_FREE(leases);
+    }
+    virNetworkFree(net);
+    return rv;
+}
+
+
+static int
+remoteDispatchNetworkGetDHCPLeasesForMAC(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                         virNetServerClientPtr client,
+                                         virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                         virNetMessageErrorPtr rerr,
+                                         remote_network_get_dhcp_leases_for_mac_args *args,
+                                         remote_network_get_dhcp_leases_for_mac_ret *ret)
+{
+    int rv = -1;
+    size_t i;
+    struct daemonClientPrivate *priv = virNetServerClientGetPrivateData(client);
+    virNetworkDHCPLeasePtr *leases = NULL;
+    virNetworkPtr net = NULL;
+    int nleases = 0;
+
+    if (!priv->conn) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("connection not open"));
+        goto cleanup;
+    }
+
+    if (!(net = get_nonnull_network(priv->conn, args->net)))
+        goto cleanup;
+
+    if ((nleases = virNetworkGetDHCPLeasesForMAC(net, args->mac,
+                                                 args->need_results ? &leases : NULL,
+                                                 args->flags)) < 0)
+        goto cleanup;
+
+    if (nleases > REMOTE_NETWORK_DHCP_LEASES_MAX) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Number of leases is %d, which exceeds max limit: %d"),
+                       nleases, REMOTE_NETWORK_DHCP_LEASES_MAX);
+        return -1;
+    }
+
+    if (leases && nleases) {
+        if (VIR_ALLOC_N(ret->leases.leases_val, nleases) < 0)
+            goto cleanup;
+
+        ret->leases.leases_len = nleases;
+
+        for (i = 0; i < nleases; i++) {
+            if (remoteSerializeDHCPLease(ret->leases.leases_val + i, leases[i]) < 0)
+                goto cleanup;
+        }
+
+    } else {
+        ret->leases.leases_len = 0;
+        ret->leases.leases_val = NULL;
+    }
+
+    ret->ret = nleases;
+
+    rv = 0;
+
+ cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    if (leases) {
+        for (i = 0; i < nleases; i++)
+            virNetworkDHCPLeaseFree(leases[i]);
+        VIR_FREE(leases);
+    }
+    virNetworkFree(net);
+    return rv;
 }
 
 

src/remote/remote_driver.c

@@ -7549,6 +7549,190 @@ remoteNodeGetFreePages(virConnectPtr conn,
 }
 
 
+/* Copy contents of remote_network_dhcp_lease to virNetworkDHCPLeasePtr */
+static int
+remoteSerializeDHCPLease(virNetworkDHCPLeasePtr lease_dst, remote_network_dhcp_lease *lease_src)
+{
+    lease_dst->expirytime = lease_src->expirytime;
+    lease_dst->type = lease_src->type;
+    lease_dst->prefix = lease_src->prefix;
+
+    if (VIR_STRDUP(lease_dst->interface, lease_src->interface) < 0)
+        goto error;
+
+    if (VIR_STRDUP(lease_dst->ipaddr, lease_src->ipaddr) < 0)
+        goto error;
+
+    if (lease_src->mac) {
+        if (VIR_STRDUP(lease_dst->mac, *lease_src->mac) < 0)
+            goto error;
+    } else {
+        lease_src->mac = NULL;
+    }
+
+    if (lease_src->iaid) {
+        if (VIR_STRDUP(lease_dst->iaid, *lease_src->iaid) < 0)
+            goto error;
+    } else {
+        lease_src->iaid = NULL;
+    }
+
+    if (lease_src->hostname) {
+        if (VIR_STRDUP(lease_dst->hostname, *lease_src->hostname) < 0)
+            goto error;
+    } else {
+        lease_src->hostname = NULL;
+    }
+
+    if (lease_src->clientid) {
+        if (VIR_STRDUP(lease_dst->clientid, *lease_src->clientid) < 0)
+            goto error;
+    } else {
+        lease_src->clientid = NULL;
+    }
+
+    return 0;
+
+ error:
+    virNetworkDHCPLeaseFree(lease_dst);
+    return -1;
+}
+
+
+static int
+remoteNetworkGetDHCPLeases(virNetworkPtr net,
+                           virNetworkDHCPLeasePtr **leases,
+                           unsigned int flags)
+{
+    int rv = -1;
+    size_t i;
+    struct private_data *priv = net->conn->networkPrivateData;
+    remote_network_get_dhcp_leases_args args;
+    remote_network_get_dhcp_leases_ret ret;
+
+    virNetworkDHCPLeasePtr *leases_ret = NULL;
+    remoteDriverLock(priv);
+
+    make_nonnull_network(&args.net, net);
+    args.flags = flags;
+    args.need_results = !!leases;
+
+    memset(&ret, 0, sizeof(ret));
+
+    if (call(net->conn, priv, 0, REMOTE_PROC_NETWORK_GET_DHCP_LEASES,
+             (xdrproc_t)xdr_remote_network_get_dhcp_leases_args, (char *)&args,
+             (xdrproc_t)xdr_remote_network_get_dhcp_leases_ret, (char *)&ret) == -1)
+        goto done;
+
+    if (ret.leases.leases_len > REMOTE_NETWORK_DHCP_LEASES_MAX) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Number of leases is %d, which exceeds max limit: %d"),
+                       ret.leases.leases_len, REMOTE_NETWORK_DHCP_LEASES_MAX);
+        goto cleanup;
+    }
+
+    if (leases) {
+        if (ret.leases.leases_len &&
+            VIR_ALLOC_N(leases_ret, ret.leases.leases_len + 1) < 0)
+            goto cleanup;
+
+        for (i = 0; i < ret.leases.leases_len; i++) {
+            if (VIR_ALLOC(leases_ret[i]) < 0)
+                goto cleanup;
+
+            if (remoteSerializeDHCPLease(leases_ret[i], &ret.leases.leases_val[i]) < 0)
+                goto cleanup;
+        }
+
+        *leases = leases_ret;
+        leases_ret = NULL;
+    }
+
+    rv = ret.ret;
+
+ cleanup:
+    if (leases_ret) {
+        for (i = 0; i < ret.leases.leases_len; i++)
+            virNetworkDHCPLeaseFree(leases_ret[i]);
+        VIR_FREE(leases_ret);
+    }
+    xdr_free((xdrproc_t)xdr_remote_network_get_dhcp_leases_ret,
+             (char *) &ret);
+
+ done:
+    remoteDriverUnlock(priv);
+    return rv;
+}
+
+
+static int
+remoteNetworkGetDHCPLeasesForMAC(virNetworkPtr net,
+                                 const char *mac,
+                                 virNetworkDHCPLeasePtr **leases,
+                                 unsigned int flags)
+{
+    int rv = -1;
+    size_t i;
+    struct private_data *priv = net->conn->networkPrivateData;
+    remote_network_get_dhcp_leases_for_mac_args args;
+    remote_network_get_dhcp_leases_for_mac_ret ret;
+
+    virNetworkDHCPLeasePtr *leases_ret = NULL;
+    remoteDriverLock(priv);
+
+    make_nonnull_network(&args.net, net);
+    args.mac = (char *) mac;
+    args.flags = flags;
+    args.need_results = !!leases;
+
+    memset(&ret, 0, sizeof(ret));
+
+    if (call(net->conn, priv, 0, REMOTE_PROC_NETWORK_GET_DHCP_LEASES_FOR_MAC,
+             (xdrproc_t)xdr_remote_network_get_dhcp_leases_for_mac_args, (char *)&args,
+             (xdrproc_t)xdr_remote_network_get_dhcp_leases_for_mac_ret, (char *)&ret) == -1)
+        goto done;
+
+    if (ret.leases.leases_len > REMOTE_NETWORK_DHCP_LEASES_MAX) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Number of leases is %d, which exceeds max limit: %d"),
+                       ret.leases.leases_len, REMOTE_NETWORK_DHCP_LEASES_MAX);
+        goto cleanup;
+    }
+
+    if (leases) {
+        if (ret.leases.leases_len &&
+            VIR_ALLOC_N(leases_ret, ret.leases.leases_len + 1) < 0)
+            goto cleanup;
+
+        for (i = 0; i < ret.leases.leases_len; i++) {
+            if (VIR_ALLOC(leases_ret[i]) < 0)
+                goto cleanup;
+
+            if (remoteSerializeDHCPLease(leases_ret[i], &ret.leases.leases_val[i]) < 0)
+                goto cleanup;
+        }
+
+        *leases = leases_ret;
+        leases_ret = NULL;
+    }
+
+    rv = ret.ret;
+
+ cleanup:
+    if (leases_ret) {
+        for (i = 0; i < ret.leases.leases_len; i++)
+            virNetworkDHCPLeaseFree(leases_ret[i]);
+        VIR_FREE(leases_ret);
+    }
+    xdr_free((xdrproc_t)xdr_remote_network_get_dhcp_leases_for_mac_ret,
+             (char *) &ret);
+
+ done:
+    remoteDriverUnlock(priv);
+    return rv;
+}
+
+
 /* get_nonnull_domain and get_nonnull_network turn an on-wire
  * (name, uuid) pair into virDomainPtr or virNetworkPtr object.
  * These can return NULL if underlying memory allocations fail,
@@ -7913,6 +8097,8 @@ static virNetworkDriver network_driver = {
     .networkSetAutostart = remoteNetworkSetAutostart, /* 0.3.0 */
     .networkIsActive = remoteNetworkIsActive, /* 0.7.3 */
     .networkIsPersistent = remoteNetworkIsPersistent, /* 0.7.3 */
+    .networkGetDHCPLeases = remoteNetworkGetDHCPLeases, /* 1.2.6 */
+    .networkGetDHCPLeasesForMAC = remoteNetworkGetDHCPLeasesForMAC, /* 1.2.6 */
 };
 
 static virInterfaceDriver interface_driver = {

src/remote/remote_protocol.x

@@ -238,6 +238,9 @@ const REMOTE_CONNECT_CPU_MODELS_MAX = 8192;
 /* Upper limit on number of mountpoints to frozen */
 const REMOTE_DOMAIN_FSFREEZE_MOUNTPOINTS_MAX = 256;
 
+/* Upper limit on the maximum number of leases in one lease file */
+const REMOTE_NETWORK_DHCP_LEASES_MAX = 65536;
+
 /* UUID.  VIR_UUID_BUFLEN definition comes from libvirt.h */
 typedef opaque remote_uuid[VIR_UUID_BUFLEN];
 
@@ -3018,6 +3021,40 @@ struct remote_node_get_free_pages_ret {
     unsigned hyper counts<REMOTE_NODE_MAX_CELLS>;
 };
 
+struct remote_network_dhcp_lease {
+    remote_nonnull_string interface;
+    hyper expirytime;
+    int type;
+    remote_string mac;
+    remote_string iaid;
+    remote_nonnull_string ipaddr;
+    unsigned int prefix;
+    remote_string hostname;
+    remote_string clientid;
+};
+
+struct remote_network_get_dhcp_leases_args {
+    remote_nonnull_network net;
+    int need_results;
+    unsigned int flags;
+};
+
+struct remote_network_get_dhcp_leases_ret {
+    remote_network_dhcp_lease leases<REMOTE_NETWORK_DHCP_LEASES_MAX>;
+    unsigned int ret;
+};
+
+struct remote_network_get_dhcp_leases_for_mac_args {
+    remote_nonnull_network net;
+    remote_nonnull_string mac;
+    int need_results;
+    unsigned int flags;
+};
+
+struct remote_network_get_dhcp_leases_for_mac_ret {
+    remote_network_dhcp_lease leases<REMOTE_NETWORK_DHCP_LEASES_MAX>;
+    unsigned int ret;
+};
 
 /*----- Protocol. -----*/
 
@@ -5370,5 +5407,17 @@ enum remote_procedure {
      * @priority: high
      * @acl: connect:read
      */
-    REMOTE_PROC_NODE_GET_FREE_PAGES = 340
+    REMOTE_PROC_NODE_GET_FREE_PAGES = 340,
+
+    /**
+     * @generate: none
+     * @acl: network:read
+     */
+    REMOTE_PROC_NETWORK_GET_DHCP_LEASES = 341,
+
+    /**
+     * @generate: none
+     * @acl: network:read
+     */
+    REMOTE_PROC_NETWORK_GET_DHCP_LEASES_FOR_MAC = 342
 };

src/remote_protocol-structs

@@ -2485,6 +2485,42 @@ struct remote_node_get_free_pages_ret {
                 uint64_t *         counts_val;
         } counts;
 };
+struct remote_network_dhcp_lease {
+        remote_nonnull_string      interface;
+        int64_t                    expirytime;
+        int                        type;
+        remote_string              mac;
+        remote_string              iaid;
+        remote_nonnull_string      ipaddr;
+        u_int                      prefix;
+        remote_string              hostname;
+        remote_string              clientid;
+};
+struct remote_network_get_dhcp_leases_args {
+        remote_nonnull_network     net;
+        int                        need_results;
+        u_int                      flags;
+};
+struct remote_network_get_dhcp_leases_ret {
+        struct {
+                u_int              leases_len;
+                remote_network_dhcp_lease * leases_val;
+        } leases;
+        u_int                      ret;
+};
+struct remote_network_get_dhcp_leases_for_mac_args {
+        remote_nonnull_network     net;
+        remote_nonnull_string      mac;
+        int                        need_results;
+        u_int                      flags;
+};
+struct remote_network_get_dhcp_leases_for_mac_ret {
+        struct {
+                u_int              leases_len;
+                remote_network_dhcp_lease * leases_val;
+        } leases;
+        u_int                      ret;
+};
 enum remote_procedure {
         REMOTE_PROC_CONNECT_OPEN = 1,
         REMOTE_PROC_CONNECT_CLOSE = 2,
@@ -2826,4 +2862,6 @@ enum remote_procedure {
         REMOTE_PROC_DOMAIN_SET_TIME = 338,
         REMOTE_PROC_DOMAIN_EVENT_BLOCK_JOB_2 = 339,
         REMOTE_PROC_NODE_GET_FREE_PAGES = 340,
+        REMOTE_PROC_NETWORK_GET_DHCP_LEASES = 341,
+        REMOTE_PROC_NETWORK_GET_DHCP_LEASES_FOR_MAC = 342,
 };

src/rpc/gendispatch.pl

@@ -68,6 +68,7 @@ sub fixup_name {
     $name =~ s/Fsthaw$/FSThaw/;
     $name =~ s/Scsi/SCSI/;
     $name =~ s/Wwn$/WWN/;
+    $name =~ s/Dhcp$/DHCP/;
 
     return $name;
 }