Implementation notes: This is a true OS/400 implementation, not a PASE implementation (for PASE, use AIX implementation). It uses ASCII as internal character set. This has been accomplished using the QADRT library and include files, a C and system procedures ASCII wrapper library. See IBM QADRT description for more information. This results in libssh2 being an ASCII library: any function string argument is taken/returned in ASCII and a C/C++ calling program built around QADRT may use libssh2 functions as on any other platform. QADRT does not define ASCII wrappers for all C/system procedures: an additional module (os400sys.c) define some more of them, that are used by libssh2 and that QADRT left out. Since standard library entry points expect and return ASCII character strings, additional procedures are provided for string transcoding (see below). No wrappers to standard procedures are provided: however, nested calls to transcoding procedures may be used. Crypto API is provided by the IBM QC3 API library. It supports RSA, but not DSA. Standard compilation environment does support neither autotools nor make; in fact, very few common utilities are available. As a consequence, the libssh2_config.h has been coded manually and the compilation scripts are a set of shell scripts stored in subdirectory os400. The test environment is currently not supported on OS/400. Compiling on OS/400: These instructions target people who knows about OS/400, compiling, IFS and archive extraction. Do not ask questions about these subjects if you're not familiar with. _ As a prerequisite, QADRT development environment must be installed. _ Install the libssh2 sources directory in IFS. _ Enter shell (QSH) _ Change current directory to the libssh2 sources installation directory _ Change current directory to os400 _ Edit file iniscript.sh. You may want to change tunable configuration parameters, like debug info generation, optimisation level, listing option, target library, zlib availability and location, etc. _ Copy any file in the current directory to makelog (i.e.: cp initscript.sh makelog): this is intended to create the makelog file with an ASCII CCSID! _ Enter the command "sh make.sh > makelog 2>&1' _ Examine the makelog file to check for compilation errors. Leaving file initscript.sh unchanged, this will produce the following OS/400 objects: _ Library LIBSSH2. All other objects will be stored in this library. _ Modules for all libssh2 units. _ Binding directory LIBSSH2_A, to be used at calling program link time for statically binding the modules (specify BNDSRVPGM(QADRTTS) when creating a program using LIBSSH2_A. Also give access to the zlib BNDDIR/SRVPGM if libssh2 is compiled with zlib). _ Service program LIBSSH2., where is extracted from the src/Makefile.am VERSION variable. To be used at calling program run-time when this program has dynamically bound libssh2 at link time. _ Binding directory LIBSSH2. To be used to dynamically bind libssh2 when linking a calling program. _ Source file H. It contains all the include members needed to compile a C/C++ module using libssh2. _ LIBSSH2, SSH2_PKEY, SSH2_SFTP members in file H. These are the C/C++ header files. Original fames have been mangled to fit member name allowed syntax. _ Source file LIBSSH2RPG. It contains all the ILE/RPG /INCLUDE members needed to compile an ILE/RPG program calling libssh2 procedures. _ LIBSSH2, SSH2_PKEY, SSH2_SFTP members in file LIBSSH2RPG. These are ILE/RPG translations of the corresponding C header files. Special programming consideration: QADRT being used, the following points must be considered: _ If static binding is used, service program QADRTTS must be linked too. _ Likewise, if libssh2 has been compiled with zlib support, access to the zlib objects must be provided at link time. _ The EBCDIC CCSID used by QADRT is 37 by default, NOT THE JOB'S CCSID. If another EBCDIC CCSID is required, it must be set via a locale through a call to setlocale_a (QADRT's setlocale() ASCII wrapper) with category LC_ALL or LC_CTYPE, or by setting environment variable QADRT_ENV_LOCALE to the locale object path before executing the program. _ Do not use original source include files unless you know what you are doing. Use the installed members instead (in /QSYS.LIB/LIBSSH2.LIB/H.FILE). String transcoding support: To help passing arbitrarily encoded string arguments and/or receiving string values from/to the libssh2 API, three non-standard additional procedures are provided. They use a session pointer and a "string cache" pointer. Each time a string is transcoded, it is cached in the given cache. It is the responsibility of the caller to release the cache when its associted strings are no longer needed. These procedures and the string cache type are defined in a new libssh2_ccsid.h header file. To create a string cache, use: #include libssh2_string_cache * cache = NULL; To release all strings in a cache, call: libssh2_release_string_cache(session, &cache); The transcoding procedures are: char * libssh2_from_ccsid(LIBSSH2_SESSION *session, libssh2_string_cache **cache, unsigned short ccsid, const char *string, ssize_t inlen, size_t *outlen); char * libssh2_to_ccsid(LIBSSH2_SESSION *session, libssh2_string_cache **cache, unsigned short ccsid, const char *string, ssize_t inlen, size_t *outlen); where: session is a libssh2 session used for memory allocation. cache is the address of a string cache. ccsid is the external (i.e.: non libssh2) coded character set id. 65535 means no conversion and 0 means the current job's CCSID. string is the string to convert. inlen is the source string length in bytes: set to -1 if null-terminated. outlen if not NULL, is the address of a variable that will receive the transcoded string length upon return. libssh2_from_ccsid() transcodes the string from the given CCSID to libssh2 internal encoding (UTF-8). It is intended to be used to convert API input parameters. libssh2_to_ccsid() transcodes the string from libssh2 internal encoding (UTF-8) to the given CCSID. This has been implemented to get standard API string results in a program's native encoding. Both these functions return a pointer to the null-terminated converted string, or NULL if an error occurred. In addition, the variable pointed by outlen receives the effective byte length of the (cached) translated string, or -1 in case of error. ILE/RPG support: Since 95% of the OS/400 programmers use ILE/RPG exclusively, a definition /INCLUDE member is provided for this language. To include libssh2 definitions in an ILE/RPG module, line h bnddir('LIBSSH2/LIBSSH2') must figure in the program header, and line d/include libssh2/libssh2rpg,libssh2 in the global data section of the module's source code. If required, members ssh2_sftp, ssh2_pkey and ssh2_ccsid may also be included. For IFS source compilations, include members are located in directory /libssh2/include/libssh2rpg and have their original names retained. ILE/RPG lacks a serious macro preprocessor, thus C macros requiring this feature have not been translated. However, function-like C macros have been implemented as procedures and therefore supported in ILE/RPG.