/src/rc-gram.y

%{
/*
   rc-gram.y

   This file is part of GNU Anubis.
   Copyright (C) 2003-2014 The Anubis Team.

   GNU Anubis is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 3 of the License, or (at your
   option) any later version.

   GNU Anubis is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with GNU Anubis.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <setjmp.h>	
#include "headers.h"
#include "extern.h"
#include "rcfile.h"

extern int yylex (void);
int yyerror (const char *s);

static RC_SECTION *rc_section_create (char *, RC_LOC *, RC_STMT *);
static void rc_section_destroy (RC_SECTION **);
static void rc_section_print (RC_SECTION *);
static void rc_asgn_destroy (RC_ASGN *);
static void rc_bool_destroy (RC_BOOL *);
static void rc_level_print (int, char *);
static RC_NODE *rc_node_create (enum rc_node_type, struct rc_loc *loc);
static void rc_node_destroy (RC_NODE *);
static void rc_node_print (RC_NODE *);
static void rc_rule_destroy (RC_RULE *);
static void rc_cond_destroy (RC_COND *);
 static RC_STMT *rc_stmt_create (enum rc_stmt_type, struct rc_loc *loc);
static void rc_stmt_destroy (RC_STMT *);
static void rc_stmt_list_destroy (RC_STMT *);
static void rc_stmt_print (RC_STMT *, int);
 static int reg_modifier_add (int *, char *, struct rc_loc *);
static int check_kw (char *ident, int *flags);
static int is_prog_allowed (struct rc_loc *);
 
static RC_SECTION *rc_section;
static int debug_level;
static int error_count;
static int def_regex_modifier = R_POSIX;
static struct rc_secdef *rc_secdef;

#define YYLLOC_DEFAULT(Current, Rhs, N)			  \
  do							  \
    {							  \
      if (N)						  \
	{						  \
	  (Current).beg = YYRHSLOC(Rhs, 1).beg;		  \
	  (Current).end = YYRHSLOC(Rhs, N).end;		  \
	}						  \
      else						  \
	{						  \
	  (Current).beg = YYRHSLOC(Rhs, 0).end;		  \
	  (Current).end = (Current).beg;		  \
	}						  \
    }							  \
  while (0)

#define YY_LOCATION_PRINT(File, Loc)			    \
  do							    \
    {							    \
      if (RC_LOCUS_FILE_EQ(&(Loc).beg, &(Loc).end))	    \
	fprintf(File, "%s:%lu.%lu-%lu.%lu",		    \
		(Loc).beg.file,				    \
		(unsigned long) (Loc).beg.line,		    \
		(unsigned long) (Loc).beg.column,	    \
		(unsigned long) (Loc).end.line,		    \
		(unsigned long) (Loc).end.column);	    \
      else						    \
	fprintf(File, "%s:%lu.%lu-%s:%lu.%lu",		    \
		(Loc).beg.file,				    \
		(unsigned long) (Loc).beg.line,		    \
		(unsigned long) (Loc).beg.column,	    \
		(Loc).end.file,				    \
		(unsigned long) (Loc).end.line,		    \
		(unsigned long) (Loc).end.column);	    \
    }							    \
  while (0)
 
%}

%error-verbose
%locations
%expect 2

%union {
  char *string;
  RC_SECTION *section;
  RC_STMT *stmt;
  struct
  {
    RC_STMT *head;
    RC_STMT *tail;
  } stmtlist;
  RC_COND cond;
  RC_RULE rule;
  RC_NODE *node;
  RC_REGEX *regex;
  int num;
  struct
  {
    int part;
    RC_REGEX *key;
    char *string;
    char *sep;
  } msgpart;
  RC_LOC loc;
  char *begin_sec;
  ANUBIS_LIST list;
  int eq;
};

%token EOL T_BEGIN T_END AND OR NE
%token IF FI ELSE ELIF RULE DONE
%token CALL STOP ADD REMOVE MODIFY
%token <string> IDENT STRING REGEX D_BEGIN
%token <num> T_MSGPART

%left OR
%left AND
%left NOT

%type <string> keyword string modifier arg string_key opt_sep
%type <section> section seclist
%type <stmtlist> stmtlist
%type <stmt> stmt asgn_stmt cond_stmt else_cond rule_stmt inst_stmt modf_stmt
%type <num> modlist opt_modlist
%type <node> rule_start cond expr
%type <msgpart> msgpart s_msgpart r_msgpart key opt_key
%type <list> arglist
%type <regex> regex
%type <begin_sec> begin
%type <eq> meq

%%

input    : seclist
           {
           }
         ;

seclist  : section
           {
	     $$ = rc_section = $1;
	   }
         | seclist section
           {
	     if ($2)
	       {
		 if (rc_section == NULL)
		   {
		     $$ = rc_section = $2;
		   }
		 else
		   {
		     $1->next = $2;
		     $$ = $2;
		   }
	       }
	   }
         | seclist error
           {
	     lex_clear_state ();
	     yychar = error_sync_begin ();
	     if (yychar > 0)
	       {
		 yyerrok;
		 yyclearin;
	       }
	   }
         ;

section  : /* empty */ EOL
           {
	     $$ = NULL;
	   }
         | begin stmtlist end
           {
	     $$ = rc_section_create ($1, &@1.beg, $2.head);
	   }
         | begin end
           {
	     $$ = NULL;
	   }
         ;

begin    : T_BEGIN { verbatim (); } string EOL
           {
	     $$ = $3;
	     if (rc_section_lookup (rc_section, $3)) 
	       parse_error (&@3.beg, _("Section %s already defined"), $3);
	     rc_secdef = anubis_find_section ($3);
	   }
         | D_BEGIN EOL
           {
	     $$ = $1;
	     if (rc_section_lookup (rc_section, $1)) 
	       parse_error (&@1.beg, _("Section %s already defined"), $1);
	     rc_secdef = anubis_find_section ($1);
	   }		   
         ;

end      : T_END EOL
         ;

stmtlist : stmt
           {
	     $$.head = $$.tail = $1;
	   }
         | stmtlist stmt
           {
	     if ($2)
	       {
		 if ($$.head == NULL)
		   {
		     $$.head = $$.tail = $2;
		   }
		 else
		   {
		     $$.tail->next = $2;
		     $$.tail = $2;
		   } 
	       }
	   }
         ;

stmt     : /* empty */ EOL
           {
	     $$ = NULL;
	   }
         | asgn_stmt EOL
         | cond_stmt EOL
         | rule_stmt EOL
	 | inst_stmt EOL
	 | modf_stmt EOL
	 | error EOL
           {
	     lex_clear_state ();
	     yyerrok;
	     yyclearin;
	     $$ = NULL;
	   }
         ;

asgn_stmt: keyword arglist
           {
	     int flags;
	     if (!check_kw ($1, &flags))
	       {
		 parse_error (&@1.beg, _("unknown keyword: %s"), $1);
		 YYERROR;
	       }

	     $$ = rc_stmt_create (rc_stmt_asgn, &@1.beg);
	     $$->v.asgn.lhs = $1;
	     if (list_count ($2))
	       {
		 char *s = list_item ($2, 0);
		 if (s && !strcmp (s, "="))
		   list_remove ($2, s, NULL);
	       }
	     $$->v.asgn.rhs = $2;
	     $$->v.asgn.flags = flags;
	   }
         ;

keyword  : IDENT
           {
	     verbatim ();
	   }
         ;

arglist  : arg
           {
	     $$ = list_create ();
	     list_append ($$, $1);
	   }
         | arglist arg
           {
	     list_append ($1, $2);
	     $$ = $1;
	   }
         ;

arg      : string
         ;

cond_stmt: if cond stmtlist else_cond FI
           {
	     $$ = rc_stmt_create (rc_stmt_cond, &@1.beg);
	     $$->v.cond.node = $2;
	     $$->v.cond.iftrue = $3.head;
	     $$->v.cond.iffalse = $4;
	   }
	 ;

else_cond: /* empty */
           {
	     $$ = NULL;
	   }
         | ELIF cond stmtlist else_cond
	   {
	     $$ = rc_stmt_create (rc_stmt_cond, &@1.beg);
	     $$->v.cond.node = $2;
	     $$->v.cond.iftrue = $3.head;
	     $$->v.cond.iffalse = $4;
	   }
         | ELSE stmtlist
	   {
	     $$ = $2.head;
	   }
         ;

cond     : expr
         | '(' cond ')'
           {
	     $$ = $2;
	   }
         | cond AND cond
           {
	     $$ = rc_node_create (rc_node_bool, &@2.beg);
	     $$->v.bool.op = bool_and;
	     $$->v.bool.left = $1;
	     $$->v.bool.right = $3;
	   }
         | cond OR cond
           {
	     $$ = rc_node_create (rc_node_bool, &@2.beg);
	     $$->v.bool.op = bool_or;
	     $$->v.bool.left = $1;
	     $$->v.bool.right = $3;
	   }
         | NOT cond
           {
	     $$ = rc_node_create (rc_node_bool, &@1.beg);
	     $$->v.bool.op = bool_not;
	     $$->v.bool.left = $2;
	     $$->v.bool.right = NULL;
	   }
         ;

meq      : /* empty */
           {
	     $$ = 1;
	   }
         | '='
           {
	     $$ = 1;
	   }
         | NE
           {
	     $$ = 0;
	   }
         ;

key      : regex
           {
	     $$.part = HEADER;
	     $$.key = $1;
	     $$.string = NULL;
	   }
         | '[' string ']'
           {
	     $$.part = HEADER;
	     $$.key = NULL;
	     $$.string = $2;
	   }
         ;

opt_key  : /* empty */
           {
	     $$.string = NULL;
	     $$.key = NULL;
           }
         | key
	 ;

msgpart  : T_MSGPART opt_key 
           {
	     $$ = $2;
	     $$.sep = NULL;
	     $$.part = $1;
	   }
         | key
         ;

opt_sep  : /* empty */
           {
	     $$ = NULL;
	   }
         | '(' string ')'
           {
	     $$ = $2;
	   }
         ;

s_msgpart: msgpart
           {
	     $$ = $1;
	     if ($$.key)
	       parse_error (&@1.beg,
			    _("regexp is not allowed in this context"));
	   }
         ;

r_msgpart: msgpart
           {
	     $$ = $1;
	     if (!$$.key)
	       {
		 $$.key = anubis_regex_compile ($$.string, R_EXACT);
		 xfree ($$.string);
	       }
	   }
         ;

regex    : modlist '[' string ']'
           {
	     $$ = anubis_regex_compile ($3, $1);
	     free ($3);
	     if (!$$)
	       {
		 parse_error (&@3.beg,
			      _("Invalid regular expression (see the above message)"));
		 YYERROR;
	       }
	   }
         ;

string_key: /* empty */
           {
	     $$ = NULL;
	   }
         | '[' string ']'
           {
	     $$ = $2;
	   }
	 ;

expr     : s_msgpart opt_sep meq opt_modlist string
           {
	     RC_NODE *node = rc_node_create (rc_node_expr, &@1.beg);
	     node->v.expr.part = $1.part;
	     node->v.expr.key = $1.string;
	     node->v.expr.sep = $2;
	     node->v.expr.re = anubis_regex_compile ($5, $4);
	     free ($5);
	     if ($3)
	       $$ = node;
	     else
	       {
		 $$ = rc_node_create (rc_node_bool, &@1.beg);
		 $$->v.bool.op = bool_not;
		 $$->v.bool.left = node;
		 $$->v.bool.right = NULL;
	       }
	   }
         ;

modlist  : modifier
           {
	     $$ = def_regex_modifier;
	     reg_modifier_add (&$$, $1, &@1.beg);
	     xfree ($1);
	   }
         | modlist modifier
           {
	     reg_modifier_add (&$1, $2, &@1.beg);
	     xfree ($2);
	     $$ = $1;
	   }
         ;

opt_modlist: /* empty */
           {
	     $$ = def_regex_modifier;
	   }
         | modlist
	 ;

modifier   : ':' IDENT
           {
	     $$ = $2;
	   }
         ;

if       : IF
           {
	     if (!is_prog_allowed (&@1.beg))
	       YYERROR;
	   }
         ;

rule_stmt: rule_start EOL stmtlist DONE
           {
	     $$ = rc_stmt_create (rc_stmt_rule, &@1.beg);
	     $$->v.rule.node = $1;
	     $$->v.rule.stmt = $3.head;
	   }
         ;

rule_start: rule opt_modlist string
           {
	     $$ = rc_node_create (rc_node_expr, &@1.beg);
	     $$->v.expr.part = HEADER;
	     $$->v.expr.key = strdup (X_ANUBIS_RULE_HEADER);
	     $$->v.expr.re = anubis_regex_compile ($3, $2);
	     free ($3);
	   }
         ;

rule     : RULE
           {
	     if (!is_prog_allowed (&@1.beg))
	       YYERROR;
	   }
         ;

string   : STRING
         | IDENT
         ;

inst_stmt: STOP
           {
	     if (!is_prog_allowed (&@1.beg))
	       YYERROR;

	     $$ = rc_stmt_create (rc_stmt_inst, &@1.beg);
	     $$->v.inst.opcode = inst_stop;
	     $$->v.inst.part = NIL;
	     $$->v.inst.key  = NULL;
	     $$->v.inst.key2 = NULL;
	     $$->v.inst.arg  = NULL;
	   }
         | CALL string
           {
	     if (!is_prog_allowed (&@1.beg))
	       YYERROR;

	     $$ = rc_stmt_create (rc_stmt_inst, &@1.beg);
	     $$->v.inst.opcode = inst_call;
	     $$->v.inst.key = NULL;
	     $$->v.inst.part = NIL;
	     $$->v.inst.key2 = NULL;
	     $$->v.inst.arg  = $2;
	   }
         | ADD s_msgpart string
           {
	     if (!is_prog_allowed (&@1.beg))
	       YYERROR;

	     if ($2.part == COMMAND)
	       {
		 parse_error (&@2.beg, _("command part is not allowed"));
		 YYERROR;
	       }
	     
	     $$ = rc_stmt_create (rc_stmt_inst, &@1.beg);
	     $$->v.inst.opcode = inst_add;
	     $$->v.inst.part = $2.part;
	     $$->v.inst.key  = NULL;
	     $$->v.inst.key2 = $2.string;
	     $$->v.inst.arg  = $3;
	   }
         | REMOVE r_msgpart
           {
	     if (!is_prog_allowed (&@1.beg))
	       YYERROR;

	     if ($2.part == COMMAND)
	       {
		 parse_error (&@2.beg, _("command part is not allowed"));
		 YYERROR;
	       }
	     
	     $$ = rc_stmt_create (rc_stmt_inst, &@1.beg);
	     $$->v.inst.opcode = inst_remove;
	     $$->v.inst.part = $2.part;
	     $$->v.inst.key = $2.key;
	     $$->v.inst.key2 = NULL;
	     $$->v.inst.arg  = NULL;
	   }
         | MODIFY r_msgpart string_key string
           {
	     if (!is_prog_allowed (&@1.beg))
	       YYERROR;

	     $$ = rc_stmt_create (rc_stmt_inst, &@1.beg);
	     $$->v.inst.opcode = inst_modify;
	     $$->v.inst.part = $2.part;
	     $$->v.inst.key  = $2.key;
	     $$->v.inst.key2 = $3;
	     $$->v.inst.arg  = $4;
	   }
         | MODIFY r_msgpart string_key 
           {
	     if (!is_prog_allowed (&@1.beg))
	       YYERROR;

	     $$ = rc_stmt_create (rc_stmt_inst, &@1.beg);
	     $$->v.inst.opcode = inst_modify;
	     $$->v.inst.part = $2.part;
	     $$->v.inst.key  = $2.key;
	     if ($3 == NULL && anubis_regex_refcnt ($2.key))
	       parse_error (&@2.end, _("missing replacement value"));
	     $$->v.inst.key2 = $3;
	     $$->v.inst.arg  = NULL;
	   }
         ;

modf_stmt: REGEX modlist
           {
	     if (!is_prog_allowed (&@1.beg))
	       YYERROR;

	     def_regex_modifier = $2;
	     $$ = NULL;
	   }
         ;

%%

static void
default_error_printer (void *data, 
		       struct rc_loc *loc,
		       const char *pfx,
		       const char *fmt, va_list ap)
{
  char buf[LINEBUFFER];
  vsnprintf (buf, sizeof buf, fmt, ap);
  if (topt & T_LOCATION_COLUMN)
    anubis_error (0, 0, "%s:%lu.%lu: %s%s%s",
		  loc->file,
		  (unsigned long)loc->line,
		  (unsigned long)loc->column,
		  pfx ? pfx : "",
		  pfx ? ": " : "",
		  buf);
  else
    anubis_error (0, 0, "%s:%lu: %s%s%s",
		  loc->file, (unsigned long)loc->line,
		  pfx ? pfx : "",
		  pfx ? ": " : "",
		  buf);
}	

static void *rc_error_printer_data;
static RC_ERROR_PRINTER rc_error_printer = default_error_printer;

void
parse_error (struct rc_loc *loc, const char *fmt, ...)
{
  va_list ap;
  
  va_start (ap, fmt);
  rc_error_printer (rc_error_printer_data, loc ? loc : &rc_locus, NULL,
		    fmt, ap);
  va_end (ap);
  error_count++;
}

int
yyerror (const char *s)
{
  parse_error (NULL, "%s", s);
  return 0;
}

RC_SECTION *
rc_parse (char *name)
{
  int status;

  yydebug = yy_flex_debug = 0;
  if (debug_level > 1)
    {
      yydebug = 1;
      if (debug_level > 2)
	yy_flex_debug = 1;
    }

  if (rc_open (name))
    return NULL;

  rc_section = NULL;
  error_count = 0;
  status = yyparse ();
  if (status || error_count) 
    rc_section_list_destroy (&rc_section);
  if (debug_level)
    rc_section_print (rc_section);
  return rc_section;
}

/* Same as rc_parse() but also allows user to specify his own
   error printer function */
RC_SECTION *
rc_parse_ep (char *name, RC_ERROR_PRINTER errprn, void *data)
{
  void *save_ep_data = rc_error_printer_data;
  void *save_ep_handler = rc_error_printer;
  RC_SECTION *sec;
  rc_error_printer = errprn;
  rc_error_printer_data = data;
  sec = rc_parse (name);
  rc_error_printer = save_ep_handler;
  rc_error_printer_data = save_ep_data;
  return sec;
}

void
rc_set_debug_level (char *arg)
{
  if (!arg)
    debug_level = 0;
  else if (arg[1] != 0 || !isdigit (arg[0]))
    {
      mprintf (_("Not a valid debugging level: %s"), arg);
      return;
    }
  else
    debug_level = arg[0] - '0';
}


/* Locations */

/* To save space, each filename is allocated only once. Each filename
   has a reference count associated with it. It is incremented
   with each new allocation of the same string. It is decremented
   with each attempt to free the string. Only when the reference count
   drops to zero is the storage actually reclaimed */

struct strobj {
  char *value;          /* String value */
  size_t refcnt;        /* Reference count */
};

/* A list of string objects */
static ANUBIS_LIST /* of struct strobj */ string_list;

static int
string_comparator (void *item, void *data)
{
  struct strobj *s = item;
  return strcmp (s->value, (char*) data);
}

static int
value_comparator (void *item, void *data)
{
  struct strobj *s = item;
  return s->value != data;
}

/* Looks up a string object with the given value. If not found, a
   new object is created and added to the list. In any case the
   reference count of the objet is incremented.
   The return value is the string value associated with the object. */
char *
string_create (char *str)
{
  struct strobj *s = list_locate (string_list, str, string_comparator);
  if (!s)
    {
      s = xmalloc (sizeof (*s));
      s->value = strdup (str);
      s->refcnt = 0;
      list_prepend (string_list, s);
    }
  s->refcnt++;
  return s->value;
}

/* Destroys the object with the given string value */
void
string_destroy (char *str)
{
  struct strobj *s = list_locate (string_list, str, value_comparator);
  if (s)
    {
      if (--s->refcnt == 0)
	{
	  free (s->value);
	  list_remove (string_list, str, value_comparator);
	}
    }
}

/* Initializes LOC with the current location. If the second argument
   is not zero, it overrides the current line number. */
void
rc_mark_loc (RC_LOC *dst, RC_LOC *src)
{
  dst->file = string_create (src->file);
  dst->line = src->line;
  dst->column = src->column;
}

/* Reclaims the memory associated with the LOC */
void
rc_destroy_loc (RC_LOC *loc)
{
  string_destroy (loc->file);
}


/* Section manipulation */

RC_SECTION *
rc_section_create (char *name, struct rc_loc *loc, RC_STMT *stmt)
{
  RC_SECTION *p = xmalloc (sizeof (*p));
  rc_mark_loc (&p->loc, loc);
  p->next = NULL;
  p->name = name;
  p->stmt = stmt;
  return p;
}

void
rc_section_destroy (RC_SECTION **s)
{
  rc_stmt_list_destroy ((*s)->stmt);
  rc_destroy_loc (&(*s)->loc);
  xfree ((*s)->name);
  xfree (*s);
}

void
rc_section_list_destroy (RC_SECTION **s)
{
  while (*s)
    {
      RC_SECTION *next = (*s)->next;
      rc_section_destroy (s);
      *s = next;
    }
}

void
rc_section_print (RC_SECTION *sect)
{
  for (; sect; sect = sect->next)
    {
      printf ("BEGIN SECTION %s\n", sect->name);
      rc_stmt_print (sect->stmt, 1);
      printf ("END SECTION %s\n", sect->name);
    }
}

RC_SECTION *
rc_section_lookup (RC_SECTION *sec, char *name)
{
  for (; sec; sec = sec->next)
    if (strcmp (sec->name, name) == 0)
      break;
  return sec;
}

void
rc_section_link (RC_SECTION **ap, RC_SECTION *b)
{
  RC_SECTION *a, *prev;

  /* Remove all sections with prio == override (the default) */
  a = *ap;
  prev = NULL;
  while (a)
    {
      RC_SECTION *next = a->next;
      struct rc_secdef *sd = anubis_find_section (a->name);
      if (sd && sd->prio == prio_user_only)
	{
	  if (prev)
	    prev->next = next;
	  else
	    *ap = next;
	  rc_section_destroy (&a);
	} else
	  prev = a;
      a = next;
    }
		
  if (!*ap)
    {
      *ap = b;
      return;
    }

  for (a = *ap; a->next; a = a->next)
    ;

  while (b)
    {
      struct rc_secdef *sd;
      RC_SECTION *nxtptr = b->next;

      sd = anubis_find_section (b->name);
      if (sd)
	{
	  switch (sd->prio)
	    {
	    case prio_user:
	      b->next = *ap;
	      *ap = b;
	      break;
	    
	    case prio_system_only:
	      rc_section_destroy (&b);
	      break;
	    
	    default:
	      b->next = NULL;
	      a->next = b;
	      a = b;
	    }
	}
      else
	{
	  b->next = NULL;
	  a->next = b;
	  a = b;
	}
      b = nxtptr;
    }
}

/* Assignment manipulations */

void
rc_asgn_destroy (RC_ASGN *asgn)
{
  xfree (asgn->lhs);
  list_destroy (&asgn->rhs, anubis_free_list_item, NULL);
}

/* Bools */

void
rc_bool_destroy (RC_BOOL *bool)
{
  rc_node_destroy (bool->left);
  rc_node_destroy (bool->right);
}

/* Nodes */

/* FIXME: 2nd should better be struct rc_yyltype */
RC_NODE *
rc_node_create (enum rc_node_type t, struct rc_loc *loc)
{
  RC_NODE *p = xmalloc (sizeof (*p));
  memset (p, 0, sizeof (*p));
  rc_mark_loc (&p->loc, loc);
  p->type = t;
  return p;
}

void
rc_node_destroy (RC_NODE *node)
{
  if (!node)
    return;
  switch (node->type)
    {
    case rc_node_bool:
      rc_bool_destroy (&node->v.bool);
      break;
    
    case rc_node_expr:
      free (node->v.expr.key);
      anubis_regex_free (&node->v.expr.re);
    }
  rc_destroy_loc (&node->loc);
  xfree (node);
}

static char *
part_string (int part)
{
  switch (part)
    {
    case NIL:
      return "NIL";
    case COMMAND:
      return "COMMAND";
    case HEADER:
      return "HEADER";
    case BODY:
      return "BODY";
    default:
      return "UNKNOWN";
    }
}

void
rc_node_print (RC_NODE *node)
{
  switch (node->type)
    {
    case rc_node_expr:
      printf ("%s", part_string (node->v.expr.part));
      if (node->v.expr.key && node->v.expr.key[0] != '\n')
	printf ("[%s]",node->v.expr.key);
      if (node->v.expr.sep)
	printf ("(%s)", node->v.expr.sep);
      printf (" ");
      anubis_regex_print (node->v.expr.re);
      break;
		
    case rc_node_bool:
      switch (node->v.bool.op)
	{
	case bool_not:
	  printf ("NOT (");
	  rc_node_print (node->v.bool.left);
	  printf (")");
	  break;
      
	case bool_and:
	  printf ("AND (");
	  rc_node_print (node->v.bool.left);
	  printf (",");
	  rc_node_print (node->v.bool.right);
	  printf (")");
	  break;
      
	case bool_or:
	  printf ("OR (");
	  rc_node_print (node->v.bool.left);
	  printf (",");
	  rc_node_print (node->v.bool.right);
	  printf (")");
	  break;
	}
    }
}

/* Rules */

void
rc_rule_destroy (RC_RULE *rule)
{
  rc_node_destroy (rule->node);
  rc_stmt_list_destroy (rule->stmt);
}

/* Conditionals */

void
rc_cond_destroy (RC_COND *cond)
{
  rc_node_destroy (cond->node);
  rc_stmt_list_destroy (cond->iftrue);
  rc_stmt_list_destroy (cond->iffalse);
}

/* Instructions */

void
rc_inst_destroy (RC_INST *inst)
{
  anubis_regex_free (&inst->key);
  free (inst->key2);
  free (inst->arg);
}

static char *
inst_name (enum rc_inst_opcode opcode)
{
  switch (opcode)
    {
    case inst_stop:
      return "STOP";
    case inst_call:
      return "CALL";
    case inst_add:
      return "ADD";
    case inst_remove:
      return "REMOVE";
    case inst_modify:
      return "MODIFY";
    }
  return "UNKNOWN";
}

void
rc_inst_print (RC_INST *inst, int level)
{
  rc_level_print (level, inst_name (inst->opcode));
  switch (inst->opcode)
    {
    case inst_stop:
      break;
    
    case inst_call:
      printf (" %s", inst->arg);
      break;
    
    case inst_add:
      printf (" %s[%s]", part_string (inst->part), inst->key2);
      if (inst->arg)
	printf (" \"%s\"", inst->arg);
      break;
    
    default:
      printf (" %s ", part_string (inst->part));
      if (inst->key)
	anubis_regex_print (inst->key);
      if (inst->key2)
	printf (" [%s]", inst->key2);
      if (inst->arg)
	printf (" \"%s\"", inst->arg);
    }
}

/* Statements */
/* FIXME: See rc_node_create */
RC_STMT *
rc_stmt_create (enum rc_stmt_type type, struct rc_loc *loc)
{
  RC_STMT *p = xmalloc (sizeof (*p));
  memset (p, 0, sizeof (*p));
  rc_mark_loc (&p->loc, loc);
  p->type = type;
  return p;
}

void
rc_stmt_destroy (RC_STMT *stmt)
{
  switch (stmt->type)
    {
    case rc_stmt_asgn:
      rc_asgn_destroy (&stmt->v.asgn);
      break;
    
    case rc_stmt_rule:
      rc_rule_destroy (&stmt->v.rule);
      break;
    
    case rc_stmt_cond:
      rc_cond_destroy (&stmt->v.cond);
      break;
    
    case rc_stmt_inst:
      rc_inst_destroy (&stmt->v.inst);
    }
  rc_destroy_loc (&stmt->loc);
  xfree (stmt);
}

void
rc_stmt_list_destroy (RC_STMT *stmt)
{
  while (stmt)
    {
      RC_STMT *next = stmt->next;
      rc_stmt_destroy (stmt);
      stmt = next;
    }
}

void
rc_level_print (int level, char *str)
{
  int i;
  
  for (i = 0; i < level*2; i++)
    putchar (' ');
  printf ("%s", str);
}

static int
_print_str (void *item, void *data)
{
  printf (" %s", (char*)item);
  return 0;
}

static int
_print_stars (void *item, void *data)
{
  printf (" ***");
  return 0;
}

void
rc_stmt_print (RC_STMT *stmt, int level)
{
  for (; stmt; stmt = stmt->next)
    {
      switch (stmt->type)
	{
	case rc_stmt_asgn:
	  rc_level_print (level, "ASGN: ");
	  printf ("%s =", stmt->v.asgn.lhs);
	  list_iterate (stmt->v.asgn.rhs,
			(stmt->v.asgn.flags & KWF_HIDDEN) ?
			_print_stars : _print_str, NULL);
	  break;
	
	case rc_stmt_cond:
	  rc_level_print (level, "COND: ");
	  rc_node_print (stmt->v.cond.node);
	  printf ("\n");
	  rc_level_print (level, "IFTRUE:\n");
	  rc_stmt_print (stmt->v.cond.iftrue, level+1);
	  if (stmt->v.cond.iffalse)
	    {
	      rc_level_print (level, "IFFALSE:\n");
	      rc_stmt_print (stmt->v.cond.iffalse, level+1);
	    }
	  rc_level_print (level, "END COND");
	  break;
	
	case rc_stmt_rule:
	  rc_level_print (level, "RULE: ");
	  rc_node_print (stmt->v.rule.node);
	  printf ("\n");
	  rc_level_print (level, "BODY\n");
	  rc_stmt_print (stmt->v.rule.stmt, level+1);
	  rc_level_print (level, "END RULE");
	  break;
	
	case rc_stmt_inst:
	  rc_inst_print (&stmt->v.inst, level);
	  break;
	
	default:
	  abort ();
	}
      printf ("\n");
    }
}

int
reg_modifier_add (int *flag, char *opt, struct rc_loc *loc)
{
  /* Regex types: */
  if (!strcasecmp (opt, "re") || !strcasecmp (opt, "regex"))
    {
      re_set_type (*flag, re_typeof (def_regex_modifier));
    }
  else if (!strcasecmp (opt, "posix"))
    {
      re_set_type (*flag, R_POSIX);
    }
#ifdef HAVE_PCRE
  else if (!strcasecmp (opt, "perlre")
	   || !strcasecmp (opt, "perl"))
    {
      re_set_type (*flag, R_PERLRE);
    }
#endif /* HAVE_PCRE */
  else if (!strcasecmp (opt, "ex") || !strcasecmp (opt, "exact"))
    {
      re_set_type (*flag, R_EXACT);
    }

  /* Modifiers: */
  else if (!strcasecmp (opt, "basic"))
    {
      re_set_type (*flag, R_POSIX);
      re_set_flag (*flag, R_BASIC);
    }
  else if (!strcasecmp (opt, "extended"))
    {
      re_set_type (*flag, R_POSIX);
      re_clear_flag (*flag, R_BASIC);
    }
  else if (!strcasecmp (opt, "scase"))
    re_set_flag (*flag, R_SCASE);
  else if (!strcasecmp (opt, "icase"))
    re_clear_flag (*flag, R_SCASE);
  else
    {
      parse_error (loc, _("Unknown regexp modifier"));
      return 1;
    }
  return 0;
}


/* ******************************* Runtime ********************************* */

static struct rc_secdef_child *
child_copy (struct rc_secdef_child *p)
{
  struct rc_secdef_child *newp = xmalloc (sizeof (*newp));
  memcpy (newp, p, sizeof (*newp));
  newp->next = NULL;
  return newp;
}	

void
rc_secdef_add_child (struct rc_secdef *def,
		     struct rc_secdef_child *child)
{
  struct rc_secdef_child *p = child_copy (child);
  if (!def->child)
    def->child = p;
  else
    {
      struct rc_secdef_child *last;
      for (last = def->child; last->next; last = last->next)
	;
      last->next = p;
    }
}

struct rc_secdef_child *
rc_child_lookup (struct rc_secdef_child *child, char *str,
		 int method, int *key, int *flags)
{
  for (; child; child = child->next)
    {
      if (child->method & method)
	{
	  struct rc_kwdef *kw;
	  for (kw = child->kwdef; kw->name; kw++)
	    if (!strcmp (kw->name, str))
	      {
		*key = kw->tok;
		if (flags)
		  *flags = kw->flags;
		return child;
	      }
	}
    }
  return NULL;
}


struct disabled_keyword
{
  int method_mask;
  char *keyword;
};


static ANUBIS_LIST disabled_keyword_list;

void
rc_disable_keyword (int mask, const char *kw)
{
  ITERATOR itr;
  struct disabled_keyword *p;
  
  if (!disabled_keyword_list)
    disabled_keyword_list = list_create ();

  itr = iterator_create (disabled_keyword_list);
  for (p = iterator_first (itr); p; p = iterator_next (itr))
    {
      if (strcmp (p->keyword, kw) == 0)
	{
	  p->method_mask |= mask;
	  break;
	}
    }
  iterator_destroy (&itr);
  
  if (!p)
    {
      p = xmalloc (sizeof (*p));
      p->method_mask = mask;
      p->keyword = xstrdup (kw);
      list_append (disabled_keyword_list, p);
    }
}

int
rc_keyword_is_disabled (int mask, const char *kw)
{
  int rc = 0;
  if (disabled_keyword_list)
    {
      ITERATOR itr = iterator_create (disabled_keyword_list);
      struct disabled_keyword *p;

      for (p = iterator_first (itr); p; p = iterator_next (itr))
	{
	  if ((rc = (p->method_mask & mask) && strcmp (p->keyword, kw) == 0))
	    break;
	}
      iterator_destroy (&itr);
    }
  return rc;
}


struct eval_env
{
  int method;
  int cmp_method;
  struct rc_secdef_child *child;
  MESSAGE msg;
  void *data;
  int refcnt;
  char **refstr;
  jmp_buf jmp;
  RC_LOC loc;
  int traceable;
};

struct rc_loc const *
eval_env_locus (struct eval_env *env)
{
  return &env->loc;
}

int
eval_env_method (struct eval_env *env)
{
  return env->method;
}

MESSAGE 
eval_env_message (struct eval_env *env)
{
  return env->msg;
}

void *
eval_env_data (struct eval_env *env)
{
  return env->data;
}

void
eval_error (int retcode, struct eval_env *env, const char *fmt, ...)
{
  va_list ap;
  va_start(ap, fmt);
  rc_error_printer (rc_error_printer_data, &env->loc, NULL, fmt, ap);
  va_end(ap);
  if (retcode)
    longjmp(env->jmp, retcode);
}

void
eval_warning (struct eval_env *env, const char *fmt, ...)
{
  va_list ap;
  
  va_start(ap, fmt);
  rc_error_printer (rc_error_printer_data, &env->loc, _("warning"),
		    fmt, ap);
  va_end(ap);
}

static void asgn_eval (struct eval_env *env, RC_ASGN *asgn);
static int node_eval (struct eval_env *env, RC_NODE *node);
static int bool_eval (struct eval_env *env, RC_BOOL *bool);
static void cond_eval (struct eval_env *env, RC_COND *cond);
static void rule_eval (struct eval_env *env, RC_RULE *rule);
static void stmt_list_eval (struct eval_env *env, RC_STMT *stmt);
static void inst_eval (struct eval_env *env, RC_INST *inst);

#define VALID_STR(s) ((s)?(s):"NULL")

void
inst_eval (struct eval_env *env, RC_INST *inst)
{
  char *arg = NULL, *argp = NULL;
  
  if (!env->msg)
    return; /* FIXME: bail out? */
	
  if (inst->arg)
    {
      if (env->refstr)
	arg = argp = substitute (inst->arg, env->refstr);
      else
	arg = inst->arg;
    }
  
  switch (inst->opcode)
    {
    case inst_stop:
      tracefile (&env->loc, _("STOP"));
      longjmp (env->jmp, 1);
      break;
    
    case inst_call:
      tracefile (&env->loc, _("Calling %s"), inst->arg);
      rcfile_call_section (env->method, inst->arg, "RULE",
			   env->data, env->msg);
      break;
    
    case inst_add:
      tracefile (&env->loc, _("ADD %s [%s] %s"),
		 part_string (inst->part),
		 VALID_STR (inst->key2), arg);
      if (inst->part == BODY) 
	message_add_body (env->msg, inst->key2, arg);
      else if (inst->part == HEADER)
	message_add_header (env->msg, inst->key2, arg);
      break;
    
    case inst_modify:
      tracefile (&env->loc, _("MODIFY %s [%s] [%s] %s"),
		 part_string (inst->part),
		 anubis_regex_source (inst->key), 
		 VALID_STR (inst->key2), arg);

      switch (inst->part)
	{
	case BODY:
	  message_modify_body (env->msg, inst->key, arg);
	  break;
	  
	case HEADER:
	  message_modify_headers (env->msg, inst->key, inst->key2, arg);
	  break;

	case COMMAND:
	  message_modify_command (env->msg, inst->key, inst->key2, arg);
	  break;
	}
      break;
    
    case inst_remove:
      tracefile (&env->loc, _("REMOVE HEADER [%s]"),
		 anubis_regex_source (inst->key));
      message_remove_headers (env->msg, inst->key);
      break;
    
    default:
      abort ();
    }
  
  if (argp)
    free (argp);
}
	
void
asgn_eval (struct eval_env *env, RC_ASGN *asgn)
{
  int key;
  struct rc_secdef_child *p = rc_child_lookup (env->child, asgn->lhs,
					       env->method, &key, NULL);
  if (!p)
    return;

  if (rc_keyword_is_disabled (env->method, asgn->lhs))
    {
      eval_warning (env,
		    _("ignoring statement overridden from the command line"));
      return;
    }

  if (env->traceable)
    tracefile (&env->loc, _("Executing %s"), asgn->lhs);

  if (env->refstr)
    {
      char *s;
      ANUBIS_LIST arg = list_create ();
      ITERATOR itr = iterator_create (asgn->rhs);
      for (s = iterator_first (itr); s; s = iterator_next (itr))
	{
	  char *str = substitute (s, env->refstr);
	  list_append (arg, str);
	}
      iterator_destroy (&itr);
      p->parser (env, key, arg, p->data);
      list_destroy (&arg, anubis_free_list_item, NULL);
    }
  else
    p->parser (env, key, asgn->rhs, p->data);
}


int
re_eval_list (struct eval_env *env, char *key, char *sep,
	      RC_REGEX *re, ANUBIS_LIST list)
{
  ASSOC *p;
  ITERATOR itr;
  int rc = 0;

  itr = iterator_create (list);
  if (sep)
    {
      char *tmpbuf = NULL;
      size_t tmpsize = 0;
      size_t seplen = strlen (sep);
      char *first_val = NULL;
      
      for (p = iterator_first (itr); p; p = iterator_next (itr))
	{
	  if (!p->key || !strcasecmp (p->key, key))
	    {
	      if (tmpsize == 0)
		{
		  if (!first_val)
		    {
		      first_val = p->value; /* Initialize copy on write */
		      continue;
		    }
		  else
		    {
		      tmpbuf = xstrdup (first_val);
		      tmpsize = strlen (tmpbuf);
		      first_val = NULL;
		    }
		}
	      tmpsize += seplen + strlen (p->value);
	      tmpbuf = xrealloc (tmpbuf, tmpsize + 1);
	      strcat (tmpbuf, sep);
	      strcat (tmpbuf, p->value);
	    }
	}
      rc = anubis_regex_match (re, first_val ? first_val : tmpbuf,
			       &env->refcnt, &env->refstr);
      free (tmpbuf);
    }
  else
    {
      for (p = iterator_first (itr); rc == 0 && p; p = iterator_next (itr))
	{
	  if (!p->key || !strcasecmp (p->key, key))
	    rc = anubis_regex_match (re, p->value,
				     &env->refcnt, &env->refstr);
	}
    }
  iterator_destroy (&itr);
  return rc;
}

int
re_eval_text (struct eval_env *env, RC_REGEX *re, const char *text)
{
  /* FIXME */
  return anubis_regex_match (re, text, &env->refcnt, &env->refstr);
}

int
expr_eval (struct eval_env *env, RC_EXPR *expr)
{
  int rc;

  if (env->refstr && anubis_regex_refcnt (expr->re))
    {
      argcv_free (-1, env->refstr);
      env->refcnt = 0;
      env->refstr = NULL;
    }
  
  switch (expr->part)
    {
    case COMMAND:
      rc = re_eval_list (env, expr->key, expr->sep, expr->re,
			 message_get_commands (env->msg));
      break;
    
    case HEADER:
      rc = re_eval_list (env, expr->key, expr->sep, expr->re,
			 message_get_header (env->msg));
      break;
    
    case BODY:
      rc = re_eval_text (env, expr->re, message_get_body (env->msg));
      break;
    
    default:
      abort ();
    }

  if (rc)
    {
      if (!strcmp (VALID_STR (expr->key), X_ANUBIS_RULE_HEADER))
	tracefile (&env->loc, _("Matched trigger \"%s\""),
		   anubis_regex_source (expr->re));
      else
	tracefile (&env->loc, 
		   _("Matched condition %s[%s] \"%s\""),
		   part_string (expr->part),
		   VALID_STR (expr->key),
		   anubis_regex_source (expr->re));
    }
  return rc;
}

int
node_eval (struct eval_env *env, RC_NODE *node)
{
  int rc; /* It won't be used uninitialized despite what cc says.
	     Note default: branch below */
  
  env->loc = node->loc;
  switch (node->type)
    {
    case rc_node_bool:
      rc = bool_eval (env, &node->v.bool);
      break;
    
    case rc_node_expr:
      rc = expr_eval (env, &node->v.expr);
      break;
    
    default:
      abort ();
    }
  
  return rc;
}

int
bool_eval (struct eval_env *env, RC_BOOL *bool)
{
  int rc = node_eval (env, bool->left);

  switch (bool->op)
    {
    case bool_not:
      return !rc;
    
    case bool_and:
      if (!rc)
	return 0;
      break;
    
    case bool_or:
      if (rc)
	return 1;
      break;
    }
  return node_eval (env, bool->right);
}

void
cond_eval (struct eval_env *env, RC_COND *cond)
{
  if (node_eval (env, cond->node))
    stmt_list_eval (env, cond->iftrue);
  else
    stmt_list_eval (env, cond->iffalse);
}

void
rule_eval (struct eval_env *env, RC_RULE *rule)
{
  if (node_eval (env, rule->node))
    stmt_list_eval (env, rule->stmt);
}

void
stmt_list_eval (struct eval_env *env, RC_STMT *stmt)
{
  for (; stmt; stmt = stmt->next)
    {
      env->loc = stmt->loc;
      
      switch (stmt->type)
	{
	case rc_stmt_asgn:
	  asgn_eval (env, &stmt->v.asgn);
	  break;
	
	case rc_stmt_cond:
	  cond_eval (env, &stmt->v.cond);
	  break;
	
	case rc_stmt_rule:
	  rule_eval (env, &stmt->v.rule);
	  break;
	
	case rc_stmt_inst:
	  inst_eval (env, &stmt->v.inst);
	}
    }
}

void
eval_section (int method, RC_SECTION *sec, struct rc_secdef *secdef,
	      void *data, MESSAGE msg)
{
  struct eval_env env;
  env.method = method;
  env.child = secdef->child;
  env.refcnt = 0;
  env.refstr = NULL;
  env.msg = msg;
  env.data = data;
  env.loc = sec->loc;
  env.traceable = secdef->allow_prog;

  if (env.traceable)
    tracefile (&sec->loc, _("Section %s"), sec->name);
  
  if (setjmp (env.jmp) == 0)
    stmt_list_eval (&env, sec->stmt);
  
  if (env.refstr)
    argcv_free (-1, env.refstr);
}	

void
rc_run_section (int method, RC_SECTION *sec, struct rc_secdef *secdef,
		const char *class_name, 
		void *data, MESSAGE msg)
{
  if (!sec)
    return;
  if (!class_name)
    class_name = sec->name;
  
  for (; secdef->name; secdef++)
    {
      if (!strcmp (secdef->name, class_name))
	{
	  eval_section (method, sec, secdef, data, msg);
	  return;
	}
    }
  anubis_error (0, 0, _("Unknown section: %s"), sec->name);
}


static int
check_kw (char *ident, int *flags)
{
  struct rc_secdef *p = rc_secdef;
  int key;
  
  if (!p)
    p = anubis_find_section ("RULE");
  return rc_child_lookup (p->child, ident, CF_ALL, &key, flags) != NULL;
}

static int
is_prog_allowed (struct rc_loc *loc)
{
  struct rc_secdef *p = rc_secdef;
  if (!p)
    p = anubis_find_section ("RULE");
  
  if (!p->allow_prog)
    parse_error (loc, _("program is not allowed in this section"));
  return p->allow_prog;
}