[GNUnet-developers] a couple of fixes for abstract sockets on linux

[Andrew Cann]

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These two patches fix a couple of bugs in the way abstract unix domain
sockets are used on Linux.

https://canndrew.org/misc/trim_abstract_socket_paths.diff

This changes the addrlen argument passed to the connect, bind and sendto
syscalls to reflect the length of the string in sockaddr_un.sun_path. I
was trying to talk to GNUnet services using socat and discovered that it
expects abstract sockets to be created this way and won't connect
otherwise. Looking at some other programs that I could talk to using
socat (dbus, X11), this is how they create abstract sockets as well.

https://canndrew.org/misc/dont_drop_first_character_of_abstract_socket_path.diff

Currently when using an abstract socket the first character of the path
get chopped off. So, for example, trying to create a socket called
"/tmp/gnunet-service-foo.sock" results in a socket called
"tmp/gnunet-service-foo.sock". This patch fixes this.

 - Andrew

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