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This is Gwenhywfar, a multi-platform helper library for networking and security applications and libraries. It is used by - Libchipcard (http://www.libchipcard.de), - OpenHBCI2 (http://www.openhbci.de), - Simthetic, the simulation tool (http://simthetic.sourceforge.net) - AqBanking/AqHBCI (http://www.aqbanking.de/). - and others by using one of the projects above Features ======== This library is written in C, and it follows the object-oriented programming paradigm for most of its parts. The header files can directly be used from C++, too. Gwenhywfar includes the following features: - Basic Data types for binary buffers, ring buffers, linked lists, error objects, string lists (src/base/), buffered IO operations (src/io/) - Macros for typesafe list management - OS abstraction functions for directory and Internet address handling and library loading (src/os/) - Networking functions which allow to manage many connections to be used economically even in single threaded applications - High-level functions for parsing files with a simplified "XML-like" format and accessing them like a hierarchical database (src/parser/) It is able to process valid XML files, too. - High-level cryptographic functions on top of OpenSSL functionality (src/crypt/) - Support for interprocess communication (HTTP on top of SSL or plain TCP/UDP sockets, with or without certificates for clients and/or servers) - A tool to generate simple data containers from XML files. It automatically generates getters, setters, constructor, destructor, deep-copy function, usage counter handling, modification tracking, functions for reading from and writing to GWEN_DBs (used by AqBanking to create the transaction class) Requirements ============ - GnuTLS >= 1.4 (>=2.0.1 recommended) - libgcrypt (>=1.2.0) Platforms ========= Gwenhywfar is being developed on Linux. But the following platforms are also supported: - Windows (98, NT and newer; for using this library from Microsoft Visual Studio C please see the explanations in test/README.MSVC) - FreeBSD - Linux (i386, amd64, alpha) - Mac OS-X - NetBSD (untested, but most likely to work) - OpenBSD (untested, but most likely to work) - SunOS 5.9 (compiles, untested, but most likely to work) On Windows, an .exe setup program is provided, created with the Inno Setup Compiler http://www.jrsoftware.org/isdl.php . Architectures ============= According to Debian Gwen runs on the following platforms: - alpha - amd64 - arm - hppa - i386 - ia64 - m68k - mips - mipsel - powerpc - s390 - sparc Environment Variables ===================== "GWEN_MEMORY_DEBUG" ------------------- This integer variable tells gwen whether (and how) to print the memory debugger statistic. This only works for sources compiled with the defined macro GWEN_MEMORY_DEBUG. - "0" shows ALL listed objects - "1" only shows those objects whose count is not 0 "GWEN_SSL_DEBUG" ---------------- If this environment variable exists the SSL code will append data received via an SSL connection to "/tmp/read.bin" and append data sent via an SSL connection to /tmp/written.bin". "GWEN_TLS_CIPHER_PRIORITIES" -------------------------- If this environment variable is set, the SSL code will initialize the GnuTLS library with the provided cipher priority list. If this environment variable is unset, the default cipher priority list of the GnuTLS library is being used. For the exact format of the cipher priority list and its default, please consult the GnuTLS documentation, section "Priority strings": http://gnutls.org/manual/html_node/Priority-Strings.html Registry Keys ============= On Windows platforms Gwen uses some keys below HKEY_CURRENT_USER to store information about file/folder locations. The keys are set in the Inno Setup file gwenhywfar.iss, so please check the [Registry] section in gwenyhwfar.iss.in for the authoritative source of available registry keys. "Software\\Gwenhywfar\\Paths\\dbio-plugins" ------------------------------------------- Complete path to the folder containing GWENs DBIO plugins. (and some more keys. See gwenhywfar.iss.in) Documentation ============= The documentation can be found in the header files. Many header files already include extensive comments in doxygen-format (however some don't). For a more or less complete API documentation use the command "make srcdoc" You will need the tool doxygen for this command to run. Contact ======= For questions about this library please ask on the mailing list of the AqBanking project aqbanking-devel (subscriber-only, please subscribe on http://lists.sourceforge.net/lists/listinfo/aqbanking-devel), since this is where the author(s) hang out. Authors ======= This library is being written by and is being maintained by Martin Preuss <email@example.com>. I also wish to thank Christian Stimming <firstname.lastname@example.org> for his contributions and for adding MSVC support to Gwen (thus making Gwen completely available on Windows). Name ==== The name of this library was chosen to honour a very special person ;-) (that should suffice as an explanation) Hamburg, Germany 2021/09/30