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
72 CURLOPT_COPYPOSTFIELDS
75 CURLOPT_DEFAULT_PROTOCOL
80 CURLOPT_FTP_ALTERNATIVE_TO_USER
92 CURLOPT_PINNEDPUBLICKEY
97 CURLOPT_PROXY_SERVICE_NAME
101 CURLOPT_RTSP_SESSION_UID
102 CURLOPT_RTSP_STREAM_URI
103 CURLOPT_RTSP_TRANSPORT
105 CURLOPT_SOCKS5_GSSAPI_SERVICE
106 CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
107 CURLOPT_SSH_KNOWNHOSTS
108 CURLOPT_SSH_PRIVATE_KEYFILE
109 CURLOPT_SSH_PUBLIC_KEYFILE
112 CURLOPT_SSL_CIPHER_LIST
116 CURLOPT_TLSAUTH_PASSWORD
118 CURLOPT_TLSAUTH_USERNAME
119 CURLOPT_UNIX_SOCKET_PATH
124 CURLOPT_XOAUTH2_BEARER
125 Else it is the same as for curl_easy_setopt().
126 Note that CURLOPT_ERRORBUFFER is not in the list above, since it gives the
127 address of an (empty) character buffer, not the address of a string.
128 CURLOPT_POSTFIELDS stores the address of static binary data (of type void *) and
129 thus is not converted. If CURLOPT_COPYPOSTFIELDS is issued after
130 CURLOPT_POSTFIELDSIZE != -1, the data size is adjusted according to the
131 CCSID conversion result length.
133 _ curl_formadd_ccsid()
134 In the variable argument list, string pointers should be followed by a (long)
135 CCSID for the following options:
141 CURLFORM_COPYCONTENTS
144 If taken from an argument array, an additional array entry must follow each
145 entry containing one of the above option. This additional entry holds the CCSID
146 in its value field, and the option field is meaningless.
147 It is not possible to have a string pointer and its CCSID across a function
148 parameter/array boundary.
149 Please note that CURLFORM_PTRCONTENTS and CURLFORM_BUFFERPTR are considered
150 unconvertible strings and thus are NOT followed by a CCSID.
152 _ curl_easy_getinfo_ccsid()
153 The following options are followed by a 'char * *' and a CCSID. Unlike
154 curl_easy_getinfo(), the value returned in the pointer should be freed after
156 CURLINFO_EFFECTIVE_URL
157 CURLINFO_CONTENT_TYPE
158 CURLINFO_FTP_ENTRY_PATH
159 CURLINFO_REDIRECT_URL
161 CURLINFO_RTSP_SESSION_ID
163 Likewise, the following options are followed by a struct curl_slist * * and a
167 Lists returned should be released with curl_slist_free_all() after use.
168 Option CURLINFO_CERTINFO is followed by a struct curl_certinfo * * and a
169 CCSID. Returned structures sould be free'ed using curl_certinfo_free_all() after
171 Other options are processed like in curl_easy_getinfo().
173 _ curl_pushheader_bynum_cssid() and curl_pushheader_byname_ccsid()
174 Although the prototypes are self-explanatory, the returned string pointer
175 should be freed after use, as opposite to the non-ccsid versions of these
177 Please note that HTTP2 is not (yet) implemented on OS/400, thus these
178 functions will always return NULL.
181 Standard compilation environment does support neither autotools nor make;
182 in fact, very few common utilities are available. As a consequence, the
183 config-os400.h has been coded manually and the compilation scripts are
184 a set of shell scripts stored in subdirectory packages/OS400.
186 The "curl" command and the test environment are currently not supported on
190 Protocols currently implemented on OS/400:
195 _ FTP with secure transmission
201 _ IMAP with secure transmission
205 _ POP3 with secure transmission
207 _ SCP if libssh2 is enabled
208 _ SFTP if libssh2 is enabled
211 _ SMTP with secure transmission
219 These instructions targets people who knows about OS/400, compiling, IFS and
220 archive extraction. Do not ask questions about these subjects if you're not
223 _ As a prerequisite, QADRT development environment must be installed.
224 _ If data compression has to be supported, ZLIB development environment must
226 _ Likewise, if SCP and SFTP protocols have to be compiled in, LIBSSH2
227 developent environment must be installed.
228 _ Install the curl source directory in IFS.
230 _ Change current directory to the curl installation directory
231 _ Change current directory to ./packages/OS400
232 _ Edit file iniscript.sh. You may want to change tunable configuration
233 parameters, like debug info generation, optimisation level, listing option,
234 target library, ZLIB/LIBSSH2 availability and location, etc.
235 _ Copy any file in the current directory to makelog (i.e.:
236 cp initscript.sh makelog): this is intended to create the makelog file with
238 _ Enter the command "sh makefile.sh > makelog 2>&1'
239 _ Examine the makelog file to check for compilation errors.
241 Leaving file initscript.sh unchanged, this will produce the following OS/400
243 _ Library CURL. All other objects will be stored in this library.
244 _ Modules for all libcurl units.
245 _ Binding directory CURL_A, to be used at calling program link time for
246 statically binding the modules (specify BNDSRVPGM(QADRTTS QGLDCLNT QGLDBRDR)
247 when creating a program using CURL_A).
248 _ Service program CURL.<soname>, where <soname> is extracted from the
249 lib/Makefile.am VERSION variable. To be used at calling program run-time
250 when this program has dynamically bound curl at link time.
251 _ Binding directory CURL. To be used to dynamically bind libcurl when linking a
253 _ Source file H. It contains all the include members needed to compile a C/C++
254 module using libcurl, and an ILE/RPG /copy member for support in this
256 _ Standard C/C++ libcurl include members in file H.
257 _ CCSIDCURL member in file H. This defines the non-standard EBCDIC wrappers for
259 _ CURL.INC member in file H. This defines everything needed by an ILE/RPG
260 program using libcurl.
261 _ LIBxxx modules and programs. Although the test environment is not supported
262 on OS/400, the libcurl test programs are compiled for manual tests.
263 _ IFS directory /curl/include/curl containg the C header files for IFS source
264 C/C++ compilation and curl.inc.rpgle for IFS source ILE/RPG compilation.
268 Special programming consideration:
270 QADRT being used, the following points must be considered:
271 _ If static binding is used, service program QADRTTS must be linked too.
272 _ The EBCDIC CCSID used by QADRT is 37 by default, NOT THE JOB'S CCSID. If
273 another EBCDIC CCSID is required, it must be set via a locale through a call
274 to setlocale_a (QADRT's setlocale() ASCII wrapper) with category LC_ALL or
275 LC_CTYPE, or by setting environment variable QADRT_ENV_LOCALE to the locale
276 object path before executing the program.
277 _ Do not use original source include files unless you know what you are doing.
278 Use the installed members instead (in /QSYS.LIB/CURL.LIB/H.FILE and
285 Since 95% of the OS/400 programmers use ILE/RPG exclusively, a definition
286 /INCLUDE member is provided for this language. To include all libcurl
287 definitions in an ILE/RPG module, line
289 h bnddir('CURL/CURL')
291 must figure in the program header, and line
293 d/include curl/h,curl.inc
295 in the global data section of the module's source code.
297 No vararg procedure support exists in ILE/RPG: for this reason, the following
298 considerations apply:
299 _ Procedures curl_easy_setopt_long(), curl_easy_setopt_object(),
300 curl_easy_setopt_function() and curl_easy_setopt_offset() are all alias
301 prototypes to curl_easy_setopt(), but with different parameter lists.
302 _ Procedures curl_easy_getinfo_string(), curl_easy_getinfo_long(),
303 curl_easy_getinfo_double() and curl_easy_getinfo_slist() are all alias
304 prototypes to curl_easy_getinfo(), but with different parameter lists.
305 _ Procedures curl_multi_setopt_long(), curl_multi_setopt_object(),
306 curl_multi_setopt_function() and curl_multi_setopt_offset() are all alias
307 prototypes to curl_multi_setopt(), but with different parameter lists.
308 _ The prototype of procedure curl_formadd() allows specifying a pointer option
309 and the CURLFORM_END option. This makes possible to use an option array
310 without any additional definition. If some specific incompatible argument
311 list is used in the ILE/RPG program, the latter must define a specialised
312 alias. The same applies to curl_formadd_ccsid() too.
314 Since RPG cannot cast a long to a pointer, procedure curl_form_long_value()
315 is provided for that purpose: this allows storing a long value in the curl_forms