Add a config file framework to opentracker

opentracker.conf.sample

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+# opentracker config file
+#
+
+# I)   Control directory where opentracker will chdir to. So all black/white
+#      list files may be put in that directory. (shell option -d)
+#
+# root_dir /usr/local/etc/opentracker
+#
+
+# II)  ip addresses for tcp connections, either bind to INADDR_ANY port 6969
+#      (when no shell option is present)
+#
+# connect_tcp 0.0.0.0
+#
+#      or specify them one by one (shell option -i 192.168.0.1 -p 6969)
+#
+# connect_tcp 192.168.0.1:6969
+# connect_tcp 192.168.0.2:6969
+# connect_tcp 192.168.0.3:6969
+
+# III) the same goes for udp connections (shell option -i 192.168.0.1 -P 6969)
+#
+# connect_udp 192.168.0.1:6969
+#
+#      Note, that using 0.0.0.0 for udp sockets may yield surprising results.
+#      An answer packet sent on that socket will not necessarily have the
+#      source address that the requesting client may expect, but any address
+#      on that interface
+#
+
+# IV)  If opentracker runs in a non-open mode, point it to files containing
+#      all torrent hashes that it will serve (shell option -w)
+#
+# whitelist_filename /path/to/whitelist
+#
+#      or, if opentracker was compiled to allow blacklisting (shell option -b)
+#
+# blacklist_filename ./blacklist
+#
+#      It is pointless and hence not possible to compile black AND white
+#      listing, so choose one of those options. File format is straight
+#      forward: "<hex info hash>\n<hex info hash>\n..."
+#
+
+# V)   opentracker can be told to answer to a "GET / HTTP"-request with a
+#      redirect to another location (shell option -r)
+#
+# redirect_url https://project.tracker.local/
+
+# VI)  Sync between trackers running in a cluster is restricted to packets
+#      coming from trusted ip addresses. While source ip verification is far
+#      from perfect, the authors of opentracker trust in the correct
+#      application of tunnels, filters and LAN setups (shell option -A)
+#
+# livesync_cluster_ip 192.168.0.4
+# livesync_cluster_ip 192.168.0.5
+# livesync_cluster_ip 192.168.0.6
+#
+# batchsync_cluster_ip 10.1.1.1
+#
+
+# VII) ip address to listen for outgoing and incoming live sync packets
+#      (shell option -i 192.168.0.1 -s 9696)
+#
+# livesync_udp 192.168.0.1:9696
+#
+#      Note that two udp sockets will be opened. One on ip address 0.0.0.0
+#      port 9696, that will join the multicast group 224.23.42.1 for incoming
+#      udp packets and one on ip address 192.168.0.1 port 9696 for outgoing
+#      udp packets.