Provided by: libparse-pidl-perl_4.7.6+dfsg~ubuntu-0ubuntu2.29_amd64 
NAME
pidl - An IDL compiler written in Perl
SYNOPSIS
pidl --help
pidl [--outputdir[=OUTNAME]] [--includedir DIR...] [--parse-idl-tree] [--dump-idl-tree] [--dump-ndr-tree]
[--header[=OUTPUT]] [--python[=OUTPUT]] [--ndr-parser[=OUTPUT]] [--client] [--server] [--warn-compat]
[--quiet] [--verbose] [--template] [--ws-parser[=OUTPUT]] [--diff] [--dump-idl] [--tdr-parser[=OUTPUT]]
[--samba3-ndr-client[=OUTPUT]] [--samba3-ndr-server[=OUTPUT]] [--typelib=[OUTPUT]] [<idlfile>.idl]...
DESCRIPTION
pidl is an IDL compiler written in Perl that aims to be somewhat compatible with the midl compiler. IDL
is short for "Interface Definition Language".
pidl can generate stubs for DCE/RPC server code, DCE/RPC client code and Wireshark dissectors for DCE/RPC
traffic.
IDL compilers like pidl take a description of an interface as their input and use it to generate C
(though support for other languages may be added later) code that can use these interfaces, pretty print
data sent using these interfaces, or even generate Wireshark dissectors that can parse data sent over the
wire by these interfaces.
pidl takes IDL files in the same format as is used by midl, converts it to a .pidl file (which contains
pidl's internal representation of the interface) and can then generate whatever output you need. .pidl
files should be used for debugging purposes only. Write your interface definitions in .idl format.
The goal of pidl is to implement a IDL compiler that can be used while developing the RPC subsystem in
Samba (for both marshalling/unmarshalling and debugging purposes).
OPTIONS
--help
Show list of available options.
--version
Show pidl version
--outputdir OUTNAME
Write output files to the specified directory. Defaults to the current directory.
--includedir DIR
Add DIR to the search path used by the preprocessor. This option can be specified multiple times.
--parse-idl-tree
Read internal tree structure from input files rather than assuming they contain IDL.
--dump-idl
Generate a new IDL file. File will be named OUTNAME.idl.
--header
Generate a C header file for the specified interface. Filename defaults to OUTNAME.h.
--ndr-parser
Generate a C file and C header containing NDR parsers. The filename for the parser defaults to
ndr_OUTNAME.c. The header filename will be the parser filename with the extension changed from .c to
.h.
--tdr-parser
Generate a C file and C header containing TDR parsers. The filename for the parser defaults to
tdr_OUTNAME.c. The header filename will be the parser filename with the extension changed from .c to
.h.
--typelib
Write type information to the specified file.
--server
Generate boilerplate for the RPC server that implements the interface. Filename defaults to
ndr_OUTNAME_s.c.
--template
Generate stubs for a RPC server that implements the interface. Output will be written to stdout.
--ws-parser
Generate an Wireshark dissector (in C) and header file. The dissector filename defaults to
packet-dcerpc-OUTNAME.c while the header filename defaults to packet-dcerpc-OUTNAME.h.
Pidl will read additional data from an Wireshark conformance file if present. Such a file should
have the same location as the IDL file but with the extension cnf rather than idl. See
Parse::Pidl::Wireshark::Conformance for details on the format of this file.
--diff
Parse an IDL file, generate a new IDL file based on the internal data structures and see if there
are any differences with the original IDL file. Useful for debugging pidl.
--dump-idl-tree
Tell pidl to dump the internal tree representation of an IDL file the to disk. Useful for debugging
pidl.
--dump-ndr-tree
Tell pidl to dump the internal NDR information tree it generated from the IDL file to disk. Useful
for debugging pidl.
--samba3-ndr-client
Generate client calls for Samba3, to be placed in rpc_client/. Instead of calling out to the code in
Samba3's rpc_parse/, this will call out to Samba4's NDR code instead.
--samba3-ndr-server
Generate server calls for Samba3, to be placed in rpc_server/. Instead of calling out to the code in
Samba3's rpc_parse/, this will call out to Samba4's NDR code instead.
IDL SYNTAX
IDL files are always preprocessed using the C preprocessor.
Pretty much everything in an interface (the interface itself, functions, parameters) can have attributes
(or properties whatever name you give them). Attributes always prepend the element they apply to and are
surrounded by square brackets ([]). Multiple attributes are separated by comma's; arguments to attributes
are specified between parentheses.
See the section COMPATIBILITY for the list of attributes that pidl supports.
C-style comments can be used.
CONFORMANT ARRAYS
A conformant array is one with that ends in [*] or []. The strange things about conformant arrays are
that they can only appear as the last element of a structure (unless there is a pointer to the conformant
array, of course) and the array size appears before the structure itself on the wire.
So, in this example:
typedef struct {
long abc;
long count;
long foo;
[size_is(count)] long s[*];
} Struct1;
it appears like this:
[size_is] [abc] [count] [foo] [s...]
the first [size_is] field is the allocation size of the array, and occurs before the array elements and
even before the structure alignment.
Note that size_is() can refer to a constant, but that doesn't change the wire representation. It does not
make the array a fixed array.
midl.exe would write the above array as the following C header:
typedef struct {
long abc;
long count;
long foo;
long s[1];
} Struct1;
pidl takes a different approach, and writes it like this:
typedef struct {
long abc;
long count;
long foo;
long *s;
} Struct1;
VARYING ARRAYS
A varying array looks like this:
typedef struct {
long abc;
long count;
long foo;
[size_is(count)] long *s;
} Struct1;
This will look like this on the wire:
[abc] [count] [foo] [PTR_s] [count] [s...]
FIXED ARRAYS
A fixed array looks like this:
typedef struct {
long s[10];
} Struct1;
The NDR representation looks just like 10 separate long declarations. The array size is not encoded on
the wire.
pidl also supports "inline" arrays, which are not part of the IDL/NDR standard. These are declared like
this:
typedef struct {
uint32 foo;
uint32 count;
uint32 bar;
long s[count];
} Struct1;
This appears like this:
[foo] [count] [bar] [s...]
Fixed arrays are an extension added to support some of the strange embedded structures in security
descriptors and spoolss.
This section is by no means complete. See the OpenGroup and MSDN documentation for additional
information.
COMPATIBILITY WITH MIDL
Missing features in pidl
The following MIDL features are not (yet) implemented in pidl or are implemented with an incompatible
interface:
• Asynchronous communication
• Typelibs (.tlb files)
• Datagram support (ncadg_*)
Supported attributes and statements
in, out, ref, length_is, switch_is, size_is, uuid, case, default, string, unique, ptr, pointer_default,
v1_enum, object, helpstring, range, local, call_as, endpoint, switch_type, progid, coclass, iid_is,
represent_as, transmit_as, import, include, cpp_quote.
PIDL Specific properties
public
The [public] property on a structure or union is a pidl extension that forces the generated pull/push
functions to be non-static. This allows you to declare types that can be used between modules. If you
don't specify [public] then pull/push functions for other than top-level functions are declared
static.
noprint
The [noprint] property is a pidl extension that allows you to specify that pidl should not generate a
ndr_print_*() function for that structure or union. This is used when you wish to define your own
print function that prints a structure in a nicer manner. A good example is the use of [noprint] on
dom_sid, which allows the pretty-printing of SIDs.
value
The [value(expression)] property is a pidl extension that allows you to specify the value of a field
when it is put on the wire. This allows fields that always have a well-known value to be
automatically filled in, thus making the API more programmer friendly. The expression can be any C
expression.
relative
The [relative] property can be supplied on a pointer. When it is used it declares the pointer as a
spoolss style "relative" pointer, which means it appears on the wire as an offset within the current
encapsulating structure. This is not part of normal IDL/NDR, but it is a very useful extension as it
avoids the manual encoding of many complex structures.
subcontext(length)
Specifies that a size of length bytes should be read, followed by a blob of that size, which will be
parsed as NDR.
subcontext() is deprecated now, and should not be used in new code. Instead, use represent_as() or
transmit_as().
flag
Specify boolean options, mostly used for low-level NDR options. Several options can be specified
using the | character. Note that flags are inherited by substructures!
nodiscriminant
The [nodiscriminant] property on a union means that the usual uint16 discriminent field at the start
of the union on the wire is omitted. This is not normally allowed in IDL/NDR, but is used for some
spoolss structures.
charset(name)
Specify that the array or string uses the specified charset. If this attribute is specified, pidl
will take care of converting the character data from this format to the host format. Commonly used
values are UCS2, DOS and UTF8.
Unsupported MIDL properties or statements
aggregatable, appobject, async_uuid, bindable, control, defaultbind, defaultcollelem, defaultvalue,
defaultvtable, dispinterface, displaybind, dual, entry, first_is, helpcontext, helpfile,
helpstringcontext, helpstringdll, hidden, idl_module, idl_quote, id, immediatebind, importlib,
includelib, last_is, lcid, licensed, max_is, module, ms_union, no_injected_text, nonbrowsable,
noncreatable, nonextensible, odl, oleautomation, optional, pragma, propget, propputref, propput,
readonly, requestedit, restricted, retval, source, uidefault, usesgetlasterror, vararg, vi_progid,
wire_marshal.
EXAMPLES
# Generating an Wireshark parser
$ ./pidl --ws-parser -- atsvc.idl
# Generating a TDR parser and header
$ ./pidl --tdr-parser --header -- regf.idl
# Generating a Samba3 client and server
$ ./pidl --samba3-ndr-client --samba3-ndr-server -- dfs.idl
# Generating a Samba4 NDR parser, client and server
$ ./pidl --ndr-parser --ndr-client --ndr-server -- samr.idl
SEE ALSO
<https://msdn.microsoft.com/en-us/library/windows/desktop/aa373864%28v=vs.85%29.aspx>
<https://wiki.wireshark.org/DCE/RPC>, <https://www.samba.org/>, yapp(1)
LICENSE
pidl is licensed under the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.
AUTHOR
pidl was written by Andrew Tridgell, Stefan Metzmacher, Tim Potter and Jelmer Vernooij. The current
maintainer is Jelmer Vernooij.
This manpage was written by Jelmer Vernooij, partially based on the original pidl README by Andrew
Tridgell.