domifaddr: Add virsh support

tools/virsh-domain-monitor.c
   * Introduce new command : domifaddr
     Usage: domifaddr <domain> [interface] [--full] [--source lease|agent]

     Example outputs:
     virsh # domifaddr f20
     Name       MAC address          Protocol     Address
     -------------------------------------------------------------------------------
     lo         00:00:00:00:00:00    ipv4         127.0.0.1/8
     -          -                    ipv6         ::1/128
     vnet0      52:54:00:2e:45:ce    ipv4         10.1.33.188/24
     -          -                    ipv6         2001:db8:0:f101::2/64
     -          -                    ipv6         fe80::5054:ff:fe2e:45ce/64
     vnet1      52:54:00:b1:70:19    ipv4         192.168.105.201/16
     -          -                    ipv4         192.168.201.195/16
     -          -                    ipv6         fe80::5054:ff:feb1:7019/64
     vnet2      52:54:00:36:2a:e5    N/A          N/A
     vnet3      52:54:00:20:70:3d    ipv4         192.168.105.240/16
     -          -                    ipv6         fe80::5054:ff:fe20:703d/64

     virsh # domifaddr f20 eth1 --source lease
     Name       MAC address          Protocol     Address
     -------------------------------------------------------------------------------
     vnet1      52:54:00:b1:70:19    ipv4         192.168.105.201/16
     -          -                    ipv4         192.168.201.195/16
     -          -                    ipv6         fe80::5054:ff:feb1:7019/64

     virsh # domifaddr f20 eth0 --source agent --full
     Name       MAC address          Protocol     Address
     -------------------------------------------------------------------------------
     eth0       52:54:00:2e:45:ce    ipv4         10.1.33.188/24
     eth0       52:54:00:2e:45:ce    ipv6         2001:db8:0:f101::2/64
     eth0       52:54:00:2e:45:ce    ipv6         fe80::5054:ff:fe2e:45ce/64

tools/virsh.pod
   * Document new command

Signed-off-by: Nehal J Wani <nehaljw.kkd1@gmail.com>

tools/virsh-domain-monitor.c

@@ -2197,6 +2197,143 @@ cmdDomstats(vshControl *ctl, const vshCmd *cmd)
     return ret;
 }
 
+/* "domifaddr" command
+ */
+static const vshCmdInfo info_domifaddr[] = {
+    {"help", N_("Get network interfaces' addresses for a running domain")},
+    {"desc", N_("Get network interfaces' addresses for a running domain")},
+    {NULL, NULL}
+};
+
+static const vshCmdOptDef opts_domifaddr[] = {
+    {.name = "domain",
+     .type = VSH_OT_DATA,
+     .flags = VSH_OFLAG_REQ,
+     .help = N_("domain name, id or uuid")},
+    {.name = "interface",
+     .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_NONE,
+     .help = N_("network interface name")},
+    {.name = "full",
+     .type = VSH_OT_BOOL,
+     .flags = VSH_OFLAG_NONE,
+     .help = N_("display full fields")},
+    {.name = "source",
+     .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_NONE,
+     .help = N_("address source: 'lease' or 'agent'")},
+    {.name = NULL}
+};
+
+static bool
+cmdDomIfAddr(vshControl *ctl, const vshCmd *cmd)
+{
+    virDomainPtr dom = NULL;
+    const char *interface = NULL;
+    virDomainInterfacePtr *ifaces = NULL;
+    size_t i, j;
+    int ifaces_count = 0;
+    bool ret = false;
+    bool full = vshCommandOptBool(cmd, "full");
+    const char *sourcestr = NULL;
+    int source = VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_LEASE;
+
+    if (!(dom = vshCommandOptDomain(ctl, cmd, NULL)))
+        return false;
+
+    if (vshCommandOptString(cmd, "interface", &interface) < 0)
+        goto cleanup;
+    if (vshCommandOptString(cmd, "source", &sourcestr) < 0)
+        goto cleanup;
+
+    if (sourcestr) {
+        if (STREQ(sourcestr, "lease")) {
+            source = VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_LEASE;
+        } else if (STREQ(sourcestr, "agent")) {
+            source = VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_AGENT;
+        } else {
+            vshError(ctl, _("Unknown data source '%s'"), sourcestr);
+            goto cleanup;
+        }
+    }
+
+    if ((ifaces_count = virDomainInterfaceAddresses(dom, &ifaces, source, 0)) < 0) {
+        vshError(ctl, _("Failed to query for interfaces addresses"));
+        goto cleanup;
+    }
+
+    vshPrintExtra(ctl, " %-10s %-20s %-8s     %s\n%s%s\n", _("Name"),
+                  _("MAC address"), _("Protocol"), _("Address"),
+                  _("-------------------------------------------------"),
+                  _("------------------------------"));
+
+    for (i = 0; i < ifaces_count; i++) {
+        virDomainInterfacePtr iface = ifaces[i];
+        const char *ip_addr_str = NULL;
+        const char *type = NULL;
+
+        if (interface && STRNEQ(interface, iface->name))
+            continue;
+
+        /* When the interface has no IP address */
+        if (!iface->naddrs) {
+            vshPrintExtra(ctl, " %-10s %-17s    %-12s %s\n",
+                          iface->name, iface->hwaddr, "N/A", "N/A");
+            continue;
+        }
+
+        for (j = 0; j < iface->naddrs; j++) {
+            virBuffer buf = VIR_BUFFER_INITIALIZER;
+
+            switch (iface->addrs[j].type) {
+            case VIR_IP_ADDR_TYPE_IPV4:
+                type = "ipv4";
+                break;
+            case VIR_IP_ADDR_TYPE_IPV6:
+                type = "ipv6";
+                break;
+            }
+
+            virBufferAsprintf(&buf, "%-12s %s/%d",
+                              type, iface->addrs[j].addr,
+                              iface->addrs[j].prefix);
+
+            if (virBufferError(&buf)) {
+                virBufferFreeAndReset(&buf);
+                virReportOOMError();
+                goto cleanup;
+            }
+
+            ip_addr_str = virBufferContentAndReset(&buf);
+
+            if (!ip_addr_str)
+                ip_addr_str = "";
+
+            /* Don't repeat interface name */
+            if (full || !j)
+                vshPrintExtra(ctl, " %-10s %-17s    %s\n",
+                              iface->name, iface->hwaddr, ip_addr_str);
+            else
+                vshPrintExtra(ctl, " %-10s %-17s    %s\n",
+                              "-", "-", ip_addr_str);
+
+            virBufferFreeAndReset(&buf);
+        }
+    }
+
+    ret = true;
+
+ cleanup:
+    if (ifaces && ifaces_count > 0) {
+        for (i = 0; i < ifaces_count; i++)
+            virDomainInterfaceFree(ifaces[i]);
+    }
+    VIR_FREE(ifaces);
+
+    virDomainFree(dom);
+    return ret;
+}
+
 const vshCmdDef domMonitoringCmds[] = {
     {.name = "domblkerror",
      .handler = cmdDomBlkError,
@@ -2234,6 +2371,12 @@ const vshCmdDef domMonitoringCmds[] = {
      .info = info_domif_getlink,
      .flags = 0
     },
+    {.name = "domifaddr",
+     .handler = cmdDomIfAddr,
+     .opts = opts_domifaddr,
+     .info = info_domifaddr,
+     .flags = 0
+    },
     {.name = "domiflist",
      .handler = cmdDomiflist,
      .opts = opts_domiflist,

tools/virsh.pod

@@ -731,6 +731,22 @@ B<Explanation of fields> (fields appear in the following order):
   flush_total_times - total time flush operations took (ns)
     <-- other fields provided by hypervisor -->
 
+
+=item B<domifaddr> I<domain> [I<interface>] [I<--full>]
+              [I<--source lease|agent>]
+
+Get a list of interfaces of a running domain along with their IP and MAC
+addresses, or limited output just for one interface if I<interface> is
+specified. Note that I<interface> can be driver dependent, it can be the name
+within guest OS or the name you would see in domain XML. Moreover, the whole
+command may require a guest agent to be configured for the queried domain under
+some drivers, notably qemu. If I<--full> is specified, the interface name is
+always displayed when the interface has multiple addresses or alias, otherwise
+it only displays the interface name for the first address, and "-" for the
+others. The I<--source> argument specifies what data source to use for the
+addresses, currently one of 'lease' to read DHCP leases, or 'agent' to query
+the guest OS via an agent. If unspecified, 'lease' is the default.
+
 =item B<domifstat> I<domain> I<interface-device>
 
 Get network interface stats for a running domain.