Merge pull request snabbco#52 from andywingo/checkies

Add "check" snabb_lwaftr program

src/program/snabb_lwaftr/README

@@ -1,6 +1,7 @@
 Usage:
   snabb-lwaftr run
   snabb-lwaftr transient
+  snabb-lwaftr check
 
 Use --help for per-command usage.
 Example:

src/program/snabb_lwaftr/check/README

@@ -0,0 +1,8 @@
+Usage: check BINDING-TABLE CONF IPV4-IN.PCAP IPV6-IN.PCAP IPV6-OUT.PCAP IPV6-OUT.PCAP
+
+  -h, --help
+                             Print usage information.
+
+Run the lwAFTR with input from IPV4-IN.PCAP and IPV6-IN.PCAP, and record
+output to IPV6-OUT.PCAP and IPV6-OUT.PCAP.  Exit when finished.  This
+program is used in the lwAFTR test suite.

src/program/snabb_lwaftr/check/README.inc

@@ -0,0 +1 @@
+README

src/program/snabb_lwaftr/check/check.lua

@@ -0,0 +1,47 @@
+module(..., package.seeall)
+
+local app = require("core.app")
+local config = require("core.config")
+local lib = require("core.lib")
+local pcap = require("apps.pcap.pcap")
+local lwaftr = require("apps.lwaftr.lwaftr")
+local bt = require("apps.lwaftr.binding_table")
+local conf = require("apps.lwaftr.conf")
+
+function show_usage(code)
+   print(require("program.snabb_lwaftr.check.README_inc"))
+   main.exit(code)
+end
+
+function parse_args(args)
+   local handlers = {}
+   function handlers.h() show_usage(0) end
+   args = lib.dogetopt(args, handlers, "h", { help="h" })
+   if #args ~= 6 then show_usage(1) end
+   return unpack(args)
+end
+
+function run(args)
+   local bt_file, conf_file, inv4_pcap, inv6_pcap, outv4_pcap, outv6_pcap =
+      parse_args(args)
+
+   -- It's essential to initialize the binding table before the aftrconf
+   bt.get_binding_table(bt_file)
+   local aftrconf = conf.get_aftrconf(conf_file)
+
+   local c = config.new()
+   config.app(c, "capturev4", pcap.PcapReader, inv4_pcap)
+   config.app(c, "capturev6", pcap.PcapReader, inv6_pcap)
+   config.app(c, "lwaftr", lwaftr.LwAftr, aftrconf)
+   config.app(c, "output_filev4", pcap.PcapWriter, outv4_pcap)
+   config.app(c, "output_filev6", pcap.PcapWriter, outv6_pcap)
+
+   config.link(c, "capturev4.output -> lwaftr.v4")
+   config.link(c, "capturev6.output -> lwaftr.v6")
+   config.link(c, "lwaftr.v4 -> output_filev4.input")
+   config.link(c, "lwaftr.v6 -> output_filev6.input")
+
+   app.configure(c)
+   app.main({duration=1})
+   print("done")
+end