examples: add a Lua example getting IP configuration of a device

Unfortunately, there is a bug in lgi library causing the incorrect values
being returned and the example crashes. I am going to send a patch to lgi
to fix the issues.

diff --git a/examples/lua/lgi/Makefile.am b/examples/lua/lgi/Makefile.am
index 096061a..b282028 100644 (file)
--- a/examples/lua/lgi/Makefile.am
+++ b/examples/lua/lgi/Makefile.am
@@ -3,4 +3,5 @@ EXTRA_DIST = \
        list-connections.lua \
        list-devices.lua \
        show-wifi-networks.lua \
-       get-basic-nm-info.lua
+       get-basic-nm-info.lua \
+       get-ips.lua

diff --git a/examples/lua/lgi/get-ips.lua b/examples/lua/lgi/get-ips.lua
new file mode 100755 (executable)
index 0000000..9a70de4
--- /dev/null
+++ b/examples/lua/lgi/get-ips.lua
@@ -0,0 +1,160 @@
+#!/usr/bin/env lua
+-- -*- Mode: Lua; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+-- vim: ft=lua ts=2 sts=2 sw=2 et ai
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License along
+-- with this program; if not, write to the Free Software Foundation, Inc.,
+-- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+--
+-- Copyright 2015 Red Hat, Inc.
+--
+--
+-- This example shows how to get addresses, routes and DNS information from
+-- NMIP4Config and NMIP6Config (got out of NMDevice)
+-- The example uses libnm library using GObject introspection via Lua lgi module.
+-- Most distribution ship the module as lua-lgi package.
+-- libnm guide:   https://developer.gnome.org/libnm/1.0/
+-- Lua-lgi guide: https://github.com/pavouk/lgi/blob/master/docs/guide.md
+--
+
+local lgi = require 'lgi'
+local NM = lgi.NM
+
+AF_INET = 2
+AF_INET6 = 10
+
+function to_str(table)
+  local val = ""
+  for i, str in ipairs(table) do
+    local delim = i == #table and "" or ", "
+    val = val .. str .. delim
+  end
+  return val
+end
+
+function show_addresses(dev, family)
+  if (family == AF_INET) then ip_cfg = dev:get_ip4_config()
+  else ip_cfg = dev:get_ip6_config() end
+
+  if not ip_cfg then print("None") return end
+  local nm_addresses = ip_cfg:get_addresses()
+  if #nm_addresses == 0 then print("None") return end
+
+  for _, nm_address in ipairs(nm_addresses) do
+    addr = nm_address:get_address()
+    prefix = nm_address:get_prefix()
+    print(string.format("%s/%d", addr, prefix))
+  end
+end
+
+function show_gateway(dev, family)
+  if (family == AF_INET) then ip_cfg = dev:get_ip4_config()
+  else ip_cfg = dev:get_ip6_config() end
+
+  if not ip_cfg then print("None") return end
+  gw = ip_cfg:get_gateway()
+  print(gw)
+end
+
+function show_routes(dev, family)
+  if (family == AF_INET) then ip_cfg = dev:get_ip4_config()
+  else ip_cfg = dev:get_ip6_config() end
+
+  if not ip_cfg then print("None") return end
+  local nm_routes = ip_cfg:get_routes()
+  if #nm_routes == 0 then print("None") return end
+
+  for _, nm_route in ipairs(nm_routes) do
+    dest = nm_route:get_dest()
+    prefix = nm_route:get_prefix()
+    next_hop = nm_route:get_next_hop()
+    metric = nm_route:get_metric()
+    print(string.format("%s/%d  %s  %d", dest, prefix, next_hop, metric))
+  end
+end
+
+function show_dns(dev, family)
+  if (family == AF_INET) then ip_cfg = dev:get_ip4_config()
+  else ip_cfg = dev:get_ip6_config() end
+
+  if not ip_cfg then print("None") return end
+
+  print ("Nameservers:", to_str(ip_cfg:get_nameservers()))
+  print ("Domains:    ", to_str(ip_cfg:get_domains()))
+  print ("Searches:   ", to_str(ip_cfg:get_searches()))
+  if (family == AF_INET) then
+    print ("WINS:       ", to_str(ip_cfg:get_wins_servers()))
+  end
+end
+
+
+---------------------------
+-- Main code starts here --
+---------------------------
+if not arg[1] or arg[2] then
+  io.stderr:write(string.format("Usage: %s <interface>\n", arg[0]))
+  os.exit(1)
+end
+local dev_iface = arg[1]
+
+local c = NM.Client.new()
+local device = c:get_device_by_iface(dev_iface)
+if not device then
+  io.stderr:write(string.format("Device '%s' not found\n", dev_iface))
+  os.exit(1)
+end
+
+local header = string.format("Device: %s - %s", dev_iface, device:get_device_type())
+print(header)
+print(string.rep("=", #header))
+
+print("IPv4 addresses:")
+print("---------------")
+show_addresses(device, AF_INET)
+print("")
+
+print("IPv4 gateway:")
+print("-------------")
+show_gateway(device, AF_INET)
+print("")
+
+print("IPv4 routes:")
+print("------------")
+show_routes(device, AF_INET)
+print("")
+
+print "IPv6 addresses:"
+print("---------------")
+show_addresses(device, AF_INET6)
+print("")
+
+print("IPv6 gateway:")
+print("-------------")
+show_gateway(device, AF_INET6)
+print("")
+
+print "IPv6 routes:"
+print("------------")
+show_routes(device, AF_INET6)
+print("")
+
+print "IPv4 DNS:"
+print("---------")
+show_dns(device, AF_INET)
+print("")
+
+print "IPv6 DNS:"
+print("---------")
+show_dns(device, AF_INET6)
+print("")
+