udpt: init at 2016-02-20

[makefu]

Motivation for this change

Adds an udp torrent tracker. This PR is in preparation to the udpt nix module i have in use.

Things done

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • OS X
  • Linux
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

---

[Mic92]

Fails to build with the following error:

g++ -g -std=gnu++11 -c -o main.o src/main.cpp -DBOOST_LOG_DYN_LINK
src/main.cpp: In function 'void daemonize(const boost::program_options::variables_map&)':
src/main.cpp:65:57: warning: ignoring return value of 'int chdir(const char*)', declared with attribute warn_unused_result [-Wunused-result]
  ::chdir(conf["daemon.chdir"].as<std::string>().c_str());
                                                         ^
g++ -g -std=gnu++11 -c -o udpTracker.o src/udpTracker.cpp -DBOOST_LOG_DYN_LINK
In file included from /nix/store/8sl4jfs3nq0pkq4gg655s3axrxdx7z29-glibc-2.24-dev/include/bits/byteswap.h:35:0,
                 from /nix/store/8sl4jfs3nq0pkq4gg655s3axrxdx7z29-glibc-2.24-dev/include/endian.h:60,
                 from /nix/store/8sl4jfs3nq0pkq4gg655s3axrxdx7z29-glibc-2.24-dev/include/sys/types.h:216,
                 from /nix/store/8sl4jfs3nq0pkq4gg655s3axrxdx7z29-glibc-2.24-dev/include/stdlib.h:275,
                 from /nix/store/hxj3mhv9cwnapzay50dwin8p05s0k89a-gcc-5.4.0/include/c++/5.4.0/cstdlib:72,
                 from /nix/store/hxj3mhv9cwnapzay50dwin8p05s0k89a-gcc-5.4.0/include/c++/5.4.0/bits/stl_algo.h:59,
                 from /nix/store/hxj3mhv9cwnapzay50dwin8p05s0k89a-gcc-5.4.0/include/c++/5.4.0/algorithm:62,
                 from src/udpTracker.hpp:26,
                 from src/udpTracker.cpp:20:
src/udpTracker.cpp: In member function 'void UDPT::UDPTracker::start()':
src/udpTracker.cpp:105:191: error: expected id-expression before '(' token
    BOOST_LOG_SEV(m_logger, boost::log::trivial::info) << "UDP tracker bound on " << ::inet_ntop(AF_INET, reinterpret_cast<LPVOID>(&m_localEndpoint.sin_addr), buff, sizeof(buff)) << ":" << ::htons(m_localEndpoint.sin_port);
                                                                                                                                                                                               ^
make: *** [Makefile:28: udpTracker.o] Error 1

[makefu]

@Mic92 Correct, it seems the issue is new to the latest version of boost packaged in master. I look into it.

EDIT: It looks like this is related to :: explicit global namespacing - https://bbs.archlinux.org/viewtopic.php?id=53751

The issue does not appear when building with nixpkgs stable (16.03)

EDIT2: more like it is related to Optimization in place where global functions maybe come macros ... https://stackoverflow.com/questions/14431776/c-ntohs-fails-on-higher-optimization-levels

[Mic92]

I guess the easiest way to solve this, is to report this in the upstream project.

[makefu]

@Mic92 you are right, let's wait for upstream.

[joachifm]

Somewhat unintuitively, you can "fix" the build by disabling fortify hardening (which imposes use of -O2, triggering the build error).

[makefu]

@Mic92 seems upstream fixed the issue with naim94a/udpt@e826b58 . i will test this later on