4 This is a true OS/400 implementation, not a PASE implementation (for PASE,
5 use AIX implementation).
7 The biggest problem with OS/400 is EBCDIC. Libcurl implements an internal
8 conversion mechanism, but it has been designed for computers that have a
9 single native character set. OS/400 default native character set varies
10 depending on the country for which it has been localized. And more, a job
11 may dynamically alter its "native" character set.
12 Several characters that do not have fixed code in EBCDIC variants are
13 used in libcurl strings. As a consequence, using the existing conversion
14 mechanism would have lead in a localized binary library - not portable across
16 For this reason, and because libcurl was originally designed for ASCII based
17 operating systems, the current OS/400 implementation uses ASCII as internal
18 character set. This has been accomplished using the QADRT library and
19 include files, a C and system procedures ASCII wrapper library. See IBM QADRT
20 description for more information.
21 This then results in libcurl being an ASCII library: any function string
22 argument is taken/returned in ASCII and a C/C++ calling program built around
23 QADRT may use libcurl functions as on any other platform.
24 QADRT does not define ASCII wrappers for all C/system procedures: the
25 OS/400 configuration header file and an additional module (os400sys.c) define
26 some more of them, that are used by libcurl and that QADRT left out.
27 To support all the different variants of EBCDIC, non-standard wrapper
28 procedures have been added to libcurl on OS/400: they provide an additional
29 CCSID (numeric Coded Character Set ID specific to OS/400) parameter for each
30 string argument. String values passed to callback procedures are NOT converted,
31 so text gathered this way is (probably !) ASCII.
33 Another OS/400 problem comes from the fact that the last fixed argument of a
34 vararg procedure may not be of type char, unsigned char, short or unsigned
35 short. Enums that are internally implemented by the C compiler as one of these
36 types are also forbidden. Libcurl uses enums as vararg procedure tagfields...
37 Happily, there is a pragma forcing enums to type "int". The original libcurl
38 header files are thus altered during build process to use this pragma, in
39 order to force libcurl enums of being type int (the pragma disposition in use
40 before inclusion is restored before resuming the including unit compilation).
42 Secure socket layer is provided by the IBM GSKit API: unlike other SSL
43 implementations, GSKit is based on "certificate stores" or keyrings
44 rather than individual certificate/key files. Certificate stores, as well as
45 "certificate labels" are managed by external IBM-defined applications.
46 There are two ways to specify an SSL context:
47 - By an application identifier.
48 - By a keyring file pathname and (optionally) certificate label.
49 To identify an SSL context by application identifier, use option
50 SETOPT_SSLCERT to specify the application identifier.
51 To address an SSL context by keyring and certificate label, use CURLOPT_CAINFO
52 to set-up the keyring pathname, CURLOPT_SSLCERT to define the certificate label
53 (omitting it will cause the default certificate in keyring to be used) and
54 CURLOPT_KEYPASSWD to give the keyring password. If SSL is used without
55 defining any of these options, the default (i.e.: system) keyring is used for
56 server certificate validation.
58 Non-standard EBCDIC wrapper prototypes are defined in an additional header
59 file: ccsidcurl.h. These should be self-explanatory to an OS/400-aware
60 designer. CCSID 0 can be used to select the current job's CCSID.
61 Wrapper procedures with variable arguments are described below:
63 _ curl_easy_setopt_ccsid()
64 Variable arguments are a string pointer and a CCSID (unsigned int) for
66 CURLOPT_ABSTRACT_UNIX_SOCKET
73 CURLOPT_COPYPOSTFIELDS
76 CURLOPT_DEFAULT_PROTOCOL
82 CURLOPT_FTP_ALTERNATIVE_TO_USER
93 CURLOPT_PINNEDPUBLICKEY
101 CURLOPT_PROXY_CRLFILE
102 CURLOPT_PROXY_KEYPASSWD
103 CURLOPT_PROXY_PINNEDPUBLICKEY
104 CURLOPT_PROXY_SERVICE_NAME
105 CURLOPT_PROXY_SSLCERT
106 CURLOPT_PROXY_SSLCERTTYPE
108 CURLOPT_PROXY_SSLKEYTYPE
109 CURLOPT_PROXY_SSL_CIPHER_LIST
110 CURLOPT_PROXY_TLSAUTH_PASSWORD
111 CURLOPT_PROXY_TLSAUTH_TYPE
112 CURLOPT_PROXY_TLSAUTH_USERNAME
116 CURLOPT_REQUEST_TARGET
117 CURLOPT_RTSP_SESSION_UID
118 CURLOPT_RTSP_STREAM_URI
119 CURLOPT_RTSP_TRANSPORT
121 CURLOPT_SOCKS5_GSSAPI_SERVICE
122 CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
123 CURLOPT_SSH_KNOWNHOSTS
124 CURLOPT_SSH_PRIVATE_KEYFILE
125 CURLOPT_SSH_PUBLIC_KEYFILE
131 CURLOPT_SSL_CIPHER_LIST
132 CURLOPT_TLSAUTH_PASSWORD
134 CURLOPT_TLSAUTH_USERNAME
135 CURLOPT_UNIX_SOCKET_PATH
140 CURLOPT_XOAUTH2_BEARER
141 Else it is the same as for curl_easy_setopt().
142 Note that CURLOPT_ERRORBUFFER is not in the list above, since it gives the
143 address of an (empty) character buffer, not the address of a string.
144 CURLOPT_POSTFIELDS stores the address of static binary data (of type void *) and
145 thus is not converted. If CURLOPT_COPYPOSTFIELDS is issued after
146 CURLOPT_POSTFIELDSIZE != -1, the data size is adjusted according to the
147 CCSID conversion result length.
149 _ curl_formadd_ccsid()
150 In the variable argument list, string pointers should be followed by a (long)
151 CCSID for the following options:
157 CURLFORM_COPYCONTENTS
160 If taken from an argument array, an additional array entry must follow each
161 entry containing one of the above option. This additional entry holds the CCSID
162 in its value field, and the option field is meaningless.
163 It is not possible to have a string pointer and its CCSID across a function
164 parameter/array boundary.
165 Please note that CURLFORM_PTRCONTENTS and CURLFORM_BUFFERPTR are considered
166 unconvertible strings and thus are NOT followed by a CCSID.
168 _ curl_easy_getinfo_ccsid()
169 The following options are followed by a 'char * *' and a CCSID. Unlike
170 curl_easy_getinfo(), the value returned in the pointer should be freed after
172 CURLINFO_EFFECTIVE_URL
173 CURLINFO_CONTENT_TYPE
174 CURLINFO_FTP_ENTRY_PATH
175 CURLINFO_REDIRECT_URL
177 CURLINFO_RTSP_SESSION_ID
180 Likewise, the following options are followed by a struct curl_slist * * and a
184 Lists returned should be released with curl_slist_free_all() after use.
185 Option CURLINFO_CERTINFO is followed by a struct curl_certinfo * * and a
186 CCSID. Returned structures should be free'ed using curl_certinfo_free_all()
188 Other options are processed like in curl_easy_getinfo().
190 _ curl_pushheader_bynum_cssid() and curl_pushheader_byname_ccsid()
191 Although the prototypes are self-explanatory, the returned string pointer
192 should be freed after use, as opposite to the non-ccsid versions of these
194 Please note that HTTP2 is not (yet) implemented on OS/400, thus these
195 functions will always return NULL.
198 Standard compilation environment does support neither autotools nor make;
199 in fact, very few common utilities are available. As a consequence, the
200 config-os400.h has been coded manually and the compilation scripts are
201 a set of shell scripts stored in subdirectory packages/OS400.
203 The "curl" command and the test environment are currently not supported on
207 Protocols currently implemented on OS/400:
212 _ FTP with secure transmission
218 _ IMAP with secure transmission
222 _ POP3 with secure transmission
224 _ SCP if libssh2 is enabled
225 _ SFTP if libssh2 is enabled
228 _ SMTP with secure transmission
236 These instructions targets people who knows about OS/400, compiling, IFS and
237 archive extraction. Do not ask questions about these subjects if you're not
240 _ As a prerequisite, QADRT development environment must be installed.
241 _ If data compression has to be supported, ZLIB development environment must
243 _ Likewise, if SCP and SFTP protocols have to be compiled in, LIBSSH2
244 developent environment must be installed.
245 _ Install the curl source directory in IFS. Do NOT install it in the
246 installation target directory (which defaults to /curl).
248 _ Change current directory to the curl installation directory
249 _ Change current directory to ./packages/OS400
250 _ Edit file iniscript.sh. You may want to change tunable configuration
251 parameters, like debug info generation, optimisation level, listing option,
252 target library, ZLIB/LIBSSH2 availability and location, etc.
253 _ Copy any file in the current directory to makelog (i.e.:
254 cp initscript.sh makelog): this is intended to create the makelog file with
256 _ Enter the command "sh makefile.sh > makelog 2>&1'
257 _ Examine the makelog file to check for compilation errors.
259 Leaving file initscript.sh unchanged, this will produce the following OS/400
261 _ Library CURL. All other objects will be stored in this library.
262 _ Modules for all libcurl units.
263 _ Binding directory CURL_A, to be used at calling program link time for
264 statically binding the modules (specify BNDSRVPGM(QADRTTS QGLDCLNT QGLDBRDR)
265 when creating a program using CURL_A).
266 _ Service program CURL.<soname>, where <soname> is extracted from the
267 lib/Makefile.am VERSION variable. To be used at calling program run-time
268 when this program has dynamically bound curl at link time.
269 _ Binding directory CURL. To be used to dynamically bind libcurl when linking a
271 _ Source file H. It contains all the include members needed to compile a C/C++
272 module using libcurl, and an ILE/RPG /copy member for support in this
274 _ Standard C/C++ libcurl include members in file H.
275 _ CCSIDCURL member in file H. This defines the non-standard EBCDIC wrappers for
277 _ CURL.INC member in file H. This defines everything needed by an ILE/RPG
278 program using libcurl.
279 _ LIBxxx modules and programs. Although the test environment is not supported
280 on OS/400, the libcurl test programs are compiled for manual tests.
281 _ IFS directory /curl/include/curl containing the C header files for IFS source
282 C/C++ compilation and curl.inc.rpgle for IFS source ILE/RPG compilation.
286 Special programming consideration:
288 QADRT being used, the following points must be considered:
289 _ If static binding is used, service program QADRTTS must be linked too.
290 _ The EBCDIC CCSID used by QADRT is 37 by default, NOT THE JOB'S CCSID. If
291 another EBCDIC CCSID is required, it must be set via a locale through a call
292 to setlocale_a (QADRT's setlocale() ASCII wrapper) with category LC_ALL or
293 LC_CTYPE, or by setting environment variable QADRT_ENV_LOCALE to the locale
294 object path before executing the program.
295 _ Do not use original source include files unless you know what you are doing.
296 Use the installed members instead (in /QSYS.LIB/CURL.LIB/H.FILE and
303 Since 95% of the OS/400 programmers use ILE/RPG exclusively, a definition
304 /INCLUDE member is provided for this language. To include all libcurl
305 definitions in an ILE/RPG module, line
307 h bnddir('CURL/CURL')
309 must figure in the program header, and line
311 d/include curl/h,curl.inc
313 in the global data section of the module's source code.
315 No vararg procedure support exists in ILE/RPG: for this reason, the following
316 considerations apply:
317 _ Procedures curl_easy_setopt_long(), curl_easy_setopt_object(),
318 curl_easy_setopt_function() and curl_easy_setopt_offset() are all alias
319 prototypes to curl_easy_setopt(), but with different parameter lists.
320 _ Procedures curl_easy_getinfo_string(), curl_easy_getinfo_long(),
321 curl_easy_getinfo_double() and curl_easy_getinfo_slist() are all alias
322 prototypes to curl_easy_getinfo(), but with different parameter lists.
323 _ Procedures curl_multi_setopt_long(), curl_multi_setopt_object(),
324 curl_multi_setopt_function() and curl_multi_setopt_offset() are all alias
325 prototypes to curl_multi_setopt(), but with different parameter lists.
326 _ The prototype of procedure curl_formadd() allows specifying a pointer option
327 and the CURLFORM_END option. This makes possible to use an option array
328 without any additional definition. If some specific incompatible argument
329 list is used in the ILE/RPG program, the latter must define a specialised
330 alias. The same applies to curl_formadd_ccsid() too.
332 Since RPG cannot cast a long to a pointer, procedure curl_form_long_value()
333 is provided for that purpose: this allows storing a long value in the curl_forms