#!/usr/bin/perl -w
#-
# Copyright (c) 2002-2003 Networks Associates Technology, Inc.
# Copyright (c) 2004-2017 Dag-Erling Smørgrav
# All rights reserved.
#
# This software was developed for the FreeBSD Project by ThinkSec AS and
# Network Associates Laboratories, the Security Research Division of
# Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
# ("CBOSS"), as part of the DARPA CHATS research program.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote
#    products derived from this software without specific prior written
#    permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

use strict;
use warnings;
use open qw(:utf8);
use utf8;
use Fcntl;
use Getopt::Std;
use POSIX qw(strftime);
use vars qw(%AUTHORS $TODAY %FUNCTIONS %PAMERR);

%AUTHORS = (
   THINKSEC => "developed for the
Fx
Project by ThinkSec AS and Network Associates Laboratories, the
Security Research Division of Network Associates, Inc.\\& under
DARPA/SPAWAR contract N66001-01-C-8035
Pq Dq CBOSS ,
as part of the DARPA CHATS research program.
Pp
The OpenPAM library is maintained by
An Dag-Erling Sm\\(/orgrav Aq Mt des\@des.dev .",
   UIO => "developed for the University of Oslo by
An Dag-Erling Sm\\(/orgrav Aq Mt des\@des.dev .",
   DES => "developed by
An Dag-Erling Sm\\(/orgrav Aq Mt des\@des.dev .",
);

%PAMERR = (
   PAM_SUCCESS                 => "Success",
   PAM_OPEN_ERR                => "Failed to load module",
   PAM_SYMBOL_ERR              => "Invalid symbol",
   PAM_SERVICE_ERR             => "Error in service module",
   PAM_SYSTEM_ERR              => "System error",
   PAM_BUF_ERR                 => "Memory buffer error",
   PAM_CONV_ERR                => "Conversation failure",
   PAM_PERM_DENIED             => "Permission denied",
   PAM_MAXTRIES                => "Maximum number of tries exceeded",
   PAM_AUTH_ERR                => "Authentication error",
   PAM_NEW_AUTHTOK_REQD        => "New authentication token required",
   PAM_CRED_INSUFFICIENT       => "Insufficient credentials",
   PAM_AUTHINFO_UNAVAIL        => "Authentication information is unavailable",
   PAM_USER_UNKNOWN            => "Unknown user",
   PAM_CRED_UNAVAIL            => "Failed to retrieve user credentials",
   PAM_CRED_EXPIRED            => "User credentials have expired",
   PAM_CRED_ERR                => "Failed to set user credentials",
   PAM_ACCT_EXPIRED            => "User account has expired",
   PAM_AUTHTOK_EXPIRED         => "Password has expired",
   PAM_SESSION_ERR             => "Session failure",
   PAM_AUTHTOK_ERR             => "Authentication token failure",
   PAM_AUTHTOK_RECOVERY_ERR    => "Failed to recover old authentication token",
   PAM_AUTHTOK_LOCK_BUSY       => "Authentication token lock busy",
   PAM_AUTHTOK_DISABLE_AGING   => "Authentication token aging disabled",
   PAM_NO_MODULE_DATA          => "Module data not found",
   PAM_IGNORE                  => "Ignore this module",
   PAM_ABORT                   => "General failure",
   PAM_TRY_AGAIN               => "Try again",
   PAM_MODULE_UNKNOWN          => "Unknown module type",
   PAM_DOMAIN_UNKNOWN          => "Unknown authentication domain",
   PAM_BAD_HANDLE              => "Invalid PAM handle",
   PAM_BAD_ITEM                => "Unrecognized or restricted item",
   PAM_BAD_FEATURE             => "Unrecognized or restricted feature",
   PAM_BAD_CONSTANT            => "Bad constant",
);

sub parse_source($) {
   my $fn = shift;

   local *FILE;
   my $source;
   my $func;
   my $descr;
   my $type;
   my $args;
   my $argnames;
   my $man;
   my $inlist;
   my $intaglist;
   my $inliteral;
   my $customrv;
   my $deprecated;
   my $experimental;
   my $version;
   my %xref;
   my %errors;
   my $author;

   if ($fn !~ m,\.c$,) {
       warn("$fn: not C source, ignoring\n");
       return undef;
   }

   open(FILE, "<", "$fn")
       or die("$fn: open(): $!\n");
   $source = join('', <FILE>);
   close(FILE);

   return undef
       if ($source =~ m/^ \* NOPARSE\s*$/m);

   if ($source =~ m/(\$OpenPAM:[^\$]+\$)/) {
       $version = $1;
   }

   $author = 'THINKSEC';
   if ($source =~ s/^ \* AUTHOR\s+(\w*)\s*$//m) {
       $author = $1;
   }

   if ($source =~ s/^ \* DEPRECATED\s*(\w*)\s*$//m) {
       $deprecated = $1 // 0;
   }

   if ($source =~ s/^ \* EXPERIMENTAL\s*$//m) {
       $experimental = 1;
   }

   $func = $fn;
   $func =~ s,^(?:.*/)?([^/]+)\.c$,$1,;
   if ($source !~ m,\n \* ([\S ]+)\n \*/\n\n([\S ]+)\n$func\((.*?)\)\n\{,s) {
       warn("$fn: can't find $func\n");
       return undef;
   }
   ($descr, $type, $args) = ($1, $2, $3);
   $descr =~ s,^([A-Z][a-z]),lc($1),e;
   $descr =~ s,[\.\s]*$,,;
   while ($args =~ s/^((?:[^\(]|\([^\)]*\))*),\s*/$1\" \"/g) {
       # nothing
   }
   $args =~ s/,\s+/, /gs;
   $args = "\"$args\"";

   %xref = (
       3 => { 'pam' => 1 },
   );

   if ($type eq "int") {
       foreach (split("\n", $source)) {
           next unless (m/^ \*\t(!?PAM_[A-Z_]+|=[a-z_]+)\s*(.*?)\s*$/);
           $errors{$1} = $2;
       }
       ++$xref{3}->{pam_strerror};
   }

   $argnames = $args;
   # extract names of regular arguments
   $argnames =~ s/\"[^\"]+\*?\b(\w+)\"/\"$1\"/g;
   # extract names of function pointer arguments
   $argnames =~ s/\"([\w\s\*]+)\(\*?(\w+)\)\([^\)]+\)\"/\"$2\"/g;
   # escape metacharacters (there shouldn't be any, but...)
   $argnames =~ s/([\|\[\]\(\)\.\*\+\?])/\\$1/g;
   # separate argument names with |
   $argnames =~ s/\" \"/|/g;
   # and surround with ()
   $argnames =~ s/^\"(.*)\"$/$1/;
   # $argnames is now a regexp that matches argument names
   $inliteral = $inlist = $intaglist = 0;
   foreach (split("\n", $source)) {
       s/\s*$//;
       if (!defined($man)) {
           if (m/^\/\*\*$/) {
               $man = "";
           }
           next;
       }
       last if (m/^ \*\/$/);
       s/^ \* ?//;
       s/\\(.)/$1/gs;
       if (m/^$/) {
           # paragraph separator
           if ($inlist || $intaglist) {
               # either a blank line between list items, or a blank
               # line after the final list item.  The latter case
               # will be handled further down.
               next;
           }
           if ($man =~ m/\n\.Sh [^\n]+\n$/s) {
               # a blank line after a section header
               next;
           }
           if ($man ne "" && $man !~ m/\.Pp\n$/s) {
               if ($inliteral) {
                   $man .= "\0\n";
               } else {
                   $man .= ".Pp\n";
               }
           }
           next;
       }
       if (m/^>(\w+)(\s+\d)?$/) {
           # "see also" cross-reference
           my ($page, $sect) = ($1, $2 ? int($2) : 3);
           ++$xref{$sect}->{$page};
           next;
       }
       if (s/^([A-Z][0-9A-Z -]+)$/.Sh $1/) {
           if ($1 eq "RETURN VALUES") {
               $customrv = $1;
           }
           $man =~ s/\n\.Pp$/\n/s;
           $man .= "$_\n";
           next;
       }
       if (s/^\s+-\s+//) {
           # item in bullet list
           if ($inliteral) {
               $man .= ".Ed\n";
               $inliteral = 0;
           }
           if ($intaglist) {
               $man .= ".El\n.Pp\n";
               $intaglist = 0;
           }
           if (!$inlist) {
               $man =~ s/\.Pp\n$//s;
               $man .= ".Bl -bullet\n";
               $inlist = 1;
           }
           $man .= ".It\n";
           # fall through
       } elsif (s/^\s+(\S+):\s*/.It $1/) {
           # item in tag list
           if ($inliteral) {
               $man .= ".Ed\n";
               $inliteral = 0;
           }
           if ($inlist) {
               $man .= ".El\n.Pp\n";
               $inlist = 0;
           }
           if (!$intaglist) {
               $man =~ s/\.Pp\n$//s;
               $man .= ".Bl -tag -width 18n\n";
               $intaglist = 1;
           }
           s/^\.It [=;]([A-Za-z][0-9A-Za-z_]+)$/.It Dv $1/gs;
           $man .= "$_\n";
           next;
       } elsif (($inlist || $intaglist) && m/^\S/) {
           # regular text after list
           $man .= ".El\n.Pp\n";
           $inlist = $intaglist = 0;
       } elsif ($inliteral && m/^\S/) {
           # regular text after literal section
           $man .= ".Ed\n";
           $inliteral = 0;
       } elsif ($inliteral) {
           # additional text within literal section
           $man .= "$_\n";
           next;
       } elsif ($inlist || $intaglist) {
           # additional text within list
           s/^\s+//;
       } elsif (m/^\s+/) {
           # new literal section
           $man .= ".Bd -literal\n";
           $inliteral = 1;
           $man .= "$_\n";
           next;
       }
       s/\s*=($func)\b\s*/\n.Fn $1\n/gs;
       s/\s*=($argnames)\b\s*/\n.Fa $1\n/gs;
       s/\s*=((?:enum|struct|union) \w+(?: \*)?)\b\s*/\n.Vt $1\n/gs;
       s/\s*:([a-z][0-9a-z_]+)\b\s*/\n.Va $1\n/gs;
       s/\s*;([a-z][0-9a-z_]+)\b\s*/\n.Dv $1\n/gs;
       s/\s*=!([a-z][0-9a-z_]+)\b\s*/\n.Xr $1 3\n/gs;
       while (s/\s*=([a-z][0-9a-z_]+)\b\s*/\n.Xr $1 3\n/s) {
           ++$xref{3}->{$1};
       }
       s/\s*\"(?=\w)/\n.Do\n/gs;
       s/\"(?!\w)\s*/\n.Dc\n/gs;
       s/\s*=([A-Z][0-9A-Z_]+)\b\s*(?![\.,:;])/\n.Dv $1\n/gs;
       s/\s*=([A-Z][0-9A-Z_]+)\b([\.,:;]+)\s*/\n.Dv $1 $2\n/gs;
       s/\s*{([A-Z][a-z] .*?)}\s*/\n.$1\n/gs;
       $man .= "$_\n";
   }
   if (defined($man)) {
       if ($inlist || $intaglist) {
           $man .= ".El\n";
           $inlist = $intaglist = 0;
       }
       if ($inliteral) {
           $man .= ".Ed\n";
           $inliteral = 0;
       }
       $man =~ s/\%/\\&\%/gs;
       $man =~ s/(\n\.[A-Z][a-z] [\w ]+)\n([.,:;-])\s+/$1 $2\n/gs;
       $man =~ s/\s*$/\n/gm;
       $man =~ s/\n+/\n/gs;
       $man =~ s/\0//gs;
       $man =~ s/\n\n\./\n\./gs;
       chomp($man);
   } else {
       $man = "No description available.";
   }

   $FUNCTIONS{$func} = {
       'source'        => $fn,
       'version'       => $version,
       'name'          => $func,
       'descr'         => $descr,
       'type'          => $type,
       'args'          => $args,
       'man'           => $man,
       'xref'          => \%xref,
       'errors'        => \%errors,
       'author'        => $author,
       'customrv'      => $customrv,
       'deprecated'    => $deprecated,
       'experimental'  => $experimental,
   };
   if ($source =~ m/^ \* NODOC\s*$/m) {
       $FUNCTIONS{$func}->{nodoc} = 1;
   }
   if ($source !~ m/^ \* XSSO \d/m) {
       $FUNCTIONS{$func}->{openpam} = 1;
   }
   expand_errors($FUNCTIONS{$func});
   return $FUNCTIONS{$func};
}

sub expand_errors($);
sub expand_errors($) {
   my $func = shift;           # Ref to function hash

   my %errors;
   my $ref;
   my $fn;

   if (defined($$func{recursed})) {
       warn("$$func{name}(): loop in error spec\n");
       return qw();
   }
   $$func{recursed} = 1;

   foreach (keys %{$$func{errors}}) {
       if (m/^(PAM_[A-Z_]+)$/) {
           if (!defined($PAMERR{$1})) {
               warn("$$func{name}(): unrecognized error: $1\n");
               next;
           }
           $errors{$1} = $$func{errors}->{$_};
       } elsif (m/^!(PAM_[A-Z_]+)$/) {
           # treat negations separately
       } elsif (m/^=([a-z_]+)$/) {
           $ref = $1;
           if (!defined($FUNCTIONS{$ref})) {
               $fn = $$func{source};
               $fn =~ s/$$func{name}/$ref/;
               parse_source($fn);
           }
           if (!defined($FUNCTIONS{$ref})) {
               warn("$$func{name}(): reference to unknown $ref()\n");
               next;
           }
           foreach (keys %{$FUNCTIONS{$ref}->{errors}}) {
               $errors{$_} //= $FUNCTIONS{$ref}->{errors}->{$_};
           }
       } else {
           warn("$$func{name}(): invalid error specification: $_\n");
       }
   }
   foreach (keys %{$$func{errors}}) {
       if (m/^!(PAM_[A-Z_]+)$/) {
           delete($errors{$1});
       }
   }
   delete($$func{recursed});
   $$func{errors} = \%errors;
}

sub dictionary_order($$) {
   my ($a, $b) = @_;

   $a =~ s/[^[:alpha:]]//g;
   $b =~ s/[^[:alpha:]]//g;
   $a cmp $b;
}

sub genxref($) {
   my $xref = shift;           # References

   my $mdoc = '';
   my @refs = ();
   foreach my $sect (sort(keys(%{$xref}))) {
       foreach my $page (sort(dictionary_order keys(%{$xref->{$sect}}))) {
           push(@refs, "$page $sect");
       }
   }
   while ($_ = shift(@refs)) {
       $mdoc .= ".Xr $_" .
           (@refs ? " ,\n" : "\n");
   }
   return $mdoc;
}

sub gendoc($) {
   my $func = shift;           # Ref to function hash

   local *FILE;
   my %errors;
   my $mdoc;
   my $fn;

   return if defined($$func{nodoc});

   $mdoc = ".\\\"\t\$".
"NetBSD\$
\\\"
   $$func{source} =~ m/([^\/]+)$/;
   $mdoc .= ".\\\" Generated from $1 by gendoc.pl\n";
   if ($$func{version}) {
       $mdoc .= ".\\\" $$func{version}\n";
   }
   $mdoc .= ".Dd $TODAY
Dt " . uc($$func{name}) . " 3
Os
Sh NAME
Nm $$func{name}
Nd $$func{descr}
";
   if ($func =~ m/^(?:open)?pam_/) {
       $mdoc .= ".Sh LIBRARY
Lb libpam
";
   }
   $mdoc .= ".Sh SYNOPSIS
In sys/types.h
";
   if ($$func{args} =~ m/\bFILE \*\b/) {
       $mdoc .= ".In stdio.h\n";
   }
   if ($$func{name} =~ m/^(?:open)?pam/) {
       $mdoc .= ".In security/pam_appl.h
";
   }
   if ($$func{name} =~ m/_sm_/) {
       $mdoc .= ".In security/pam_modules.h\n";
   }
   if ($$func{name} =~ m/openpam/) {
       $mdoc .= ".In security/openpam.h\n";
   }
   $mdoc .= ".Ft \"$$func{type}\"
Fn $$func{name} $$func{args}
Sh DESCRIPTION
";
   if (defined($$func{deprecated})) {
       $mdoc .= ".Bf Sy\n" .
           "This function is deprecated and may be removed " .
           "in a future release without further warning.\n";
       if ($$func{deprecated}) {
           $mdoc .= "The\n.Fn $$func{deprecated}\nfunction " .
               "may be used to achieve similar results.\n";
       }
       $mdoc .= ".Ef\n.Pp\n";
   }
   if ($$func{experimental}) {
       $mdoc .= ".Bf Sy\n" .
           "This function is experimental and may be modified or removed " .
           "in a future release without prior warning.\n";
       $mdoc .= ".Ef\n.Pp\n";
   }
   $mdoc .= "$$func{man}\n";
   %errors = %{$$func{errors}};
   if ($$func{customrv}) {
       # leave it
   } elsif ($$func{type} eq "int" && %errors) {
       $mdoc .= ".Sh RETURN VALUES
The
Fn $$func{name}
function returns one of the following values:
Bl -tag -width 18n
";
       delete($errors{PAM_SUCCESS});
       foreach ('PAM_SUCCESS', sort keys %errors) {
           $mdoc .= ".It Bq Er $_\n" .
               ($errors{$_} || $PAMERR{$_}) .
               ".\n";
       }
       $mdoc .= ".El\n";
   } elsif ($$func{type} eq "int") {
       $mdoc .= ".Sh RETURN VALUES
The
Fn $$func{name}
function returns 0 on success and -1 on failure.
";
   } elsif ($$func{type} =~ m/\*$/) {
       $mdoc .= ".Sh RETURN VALUES
The
Fn $$func{name}
function returns
Dv NULL
on failure.
";
   } elsif ($$func{type} ne "void") {
       warn("$$func{name}(): no error specification\n");
   }
   $mdoc .= ".Sh SEE ALSO\n" . genxref($$func{xref});
   $mdoc .= ".Sh STANDARDS\n";
   if ($$func{openpam}) {
       $mdoc .= "The
Fn $$func{name}
function is an OpenPAM extension.
";
   } else {
       $mdoc .= ".Rs
%T \"X/Open Single Sign-On Service (XSSO) - Pluggable Authentication Modules\"
%D \"June 1997\"
Re
";
   }
   $mdoc .= ".Sh AUTHORS
The
Fn $$func{name}
function and this manual page were\n";
   $mdoc .= $AUTHORS{$$func{author} // 'THINKSEC_DARPA'} . "\n";
   $fn = "$$func{name}.3";
   if (open(FILE, ">", $fn)) {
       print(FILE $mdoc);
       close(FILE);
   } else {
       warn("$fn: open(): $!\n");
   }
}

sub readproto($) {
   my $fn = shift;             # File name

   local *FILE;
   my %func;

   open(FILE, "<", "$fn")
       or die("$fn: open(): $!\n");
   while (<FILE>) {
       if (m/^\.Nm ((?:(?:open)?pam)_.*?)\s*$/) {
           $func{Nm} = $func{Nm} || $1;
       } elsif (m/^\.Ft (\S.*?)\s*$/) {
           $func{Ft} = $func{Ft} || $1;
       } elsif (m/^\.Fn (\S.*?)\s*$/) {
           $func{Fn} = $func{Fn} || $1;
       }
   }
   close(FILE);
   if ($func{Nm}) {
       $FUNCTIONS{$func{Nm}} = \%func;
   } else {
       warn("No function found\n");
   }
}

sub gensummary($) {
   my $page = shift;           # Which page to produce

   local *FILE;
   my $upage;
   my $func;
   my %xref;

   open(FILE, ">", "$page.3")
       or die("$page.3: $!\n");

   $page =~ m/(\w+)$/;
   $upage = uc($1);
   print FILE ".\\\" Generated by gendoc.pl
Dd $TODAY
Dt $upage 3
Os
Sh NAME
";
   my @funcs = sort(keys(%FUNCTIONS));
   while ($func = shift(@funcs)) {
       print FILE ".Nm $FUNCTIONS{$func}->{Nm}";
       print FILE " ,"
               if (@funcs);
       print FILE "\n";
   }
   print FILE ".Nd Pluggable Authentication Modules Library
Sh LIBRARY
Lb libpam
Sh SYNOPSIS\n";
   if ($page eq 'pam') {
       print FILE ".In security/pam_appl.h\n";
   } else {
       print FILE ".In security/openpam.h\n";
   }
   foreach $func (sort(keys(%FUNCTIONS))) {
       print FILE ".Ft $FUNCTIONS{$func}->{Ft}\n";
       print FILE ".Fn $FUNCTIONS{$func}->{Fn}\n";
   }
   while (<STDIN>) {
       if (m/^\.Xr (\S+)\s*(\d)\s*$/) {
           ++$xref{int($2)}->{$1};
       }
       print FILE $_;
   }

   if ($page eq 'pam') {
       print FILE ".Sh RETURN VALUES
The following return codes are defined by
In security/pam_constants.h :
Bl -tag -width 18n
";
       foreach (sort(keys(%PAMERR))) {
           print FILE ".It Bq Er $_\n$PAMERR{$_}.\n";
       }
       print FILE ".El\n";
   }
   print FILE ".Sh SEE ALSO
";
   if ($page eq 'pam') {
       ++$xref{3}->{openpam};
   }
   foreach $func (keys(%FUNCTIONS)) {
       ++$xref{3}->{$func};
   }
   print FILE genxref(\%xref);
   print FILE ".Sh STANDARDS
Rs
%T \"X/Open Single Sign-On Service (XSSO) - Pluggable Authentication Modules\"
%D \"June 1997\"
Re
";
   print FILE ".Sh AUTHORS
The OpenPAM library and this manual page were $AUTHORS{THINKSEC}
";
   close(FILE);
}

sub usage() {

   print(STDERR "usage: gendoc [-op] source [...]\n");
   exit(1);
}

MAIN:{
   my %opts;

   usage()
       unless (@ARGV && getopts("op", \%opts));
   $TODAY = strftime("%B %e, %Y", localtime(time()));
   $TODAY =~ s,\s+, ,g;
   if ($opts{o} || $opts{p}) {
       foreach my $fn (@ARGV) {
           readproto($fn);
       }
       gensummary('openpam')
           if ($opts{o});
       gensummary('pam')
           if ($opts{p});
   } else {
       foreach my $fn (@ARGV) {
           my $func = parse_source($fn);
           gendoc($func)
               if (defined($func));
       }
   }
   exit(0);
}

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