%{
/* FreeS/WAN config file parser (parser.l)
 * Copyright (C) 2001 Mathieu Lafon - Arkoon Network Security
 *
 * This program 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 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program 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.
 *
 * RCSID $Id: parser.l,v 1.5 2006/03/28 22:32:33 as Exp $
 */

#include <string.h>
#include <stdlib.h>
#include <glob.h>

#include "y.tab.h"

#define MAX_INCLUDE_DEPTH  20

#define YY_NO_UNPUT
extern void yyerror(const char *);
extern int yylex (void);

static struct {
	int stack_ptr;
	YY_BUFFER_STATE stack[MAX_INCLUDE_DEPTH];
	FILE *file[MAX_INCLUDE_DEPTH];
	unsigned int line[MAX_INCLUDE_DEPTH];
	char *filename[MAX_INCLUDE_DEPTH];
} __parser_y_private;

void _parser_y_error(char *b, int size, const char *s);
void _parser_y_init (const char *f);
void _parser_y_fini (void);
int _parser_y_include (const char *filename);

void _parser_y_error(char *b, int size, const char *s)
{
    extern char *yytext; // was: char yytext[];

    snprintf(b, size, "%s:%d: %s [%s]",
	    __parser_y_private.filename[__parser_y_private.stack_ptr],
	    __parser_y_private.line[__parser_y_private.stack_ptr],
	    s, yytext);
}

void _parser_y_init (const char *f)
{
    memset(&__parser_y_private, 0, sizeof(__parser_y_private));
    __parser_y_private.line[0] = 1;
    __parser_y_private.filename[0] = strdup(f);
}

void _parser_y_fini (void)
{
    unsigned int i;

    for (i = 0; i < MAX_INCLUDE_DEPTH; i++)
    {
	if (__parser_y_private.filename[i])
	    free(__parser_y_private.filename[i]);
	if (__parser_y_private.file[i])
	    fclose(__parser_y_private.file[i]);
    }
    memset(&__parser_y_private, 0, sizeof(__parser_y_private));
}

int _parser_y_include (const char *filename)
{
    glob_t files;
    int i, ret;

    ret = glob(filename, GLOB_ERR, NULL, &files);
    if (ret)
    {
	const char *err;

	switch (ret)
	{
	case GLOB_NOSPACE:
	    err = "include files ran out of memory";
	    break;
	case GLOB_ABORTED:
	    err = "include files aborted due to read error";
	    break;
	case GLOB_NOMATCH:
	    err = "include files found no matches";
	    break;
	default:
	    err = "unknown include files error";
	}
	yyerror(err);
	return 1;
    }

    for (i = 0; i < files.gl_pathc; i++)
    {
	FILE *f;
	unsigned int p = __parser_y_private.stack_ptr + 1;

	if (p >= MAX_INCLUDE_DEPTH)
	{
	    yyerror("max inclusion depth reached");
	    return 1;
	}

	f = fopen(files.gl_pathv[i], "r");
	if (!f)
	{
	    yyerror("can't open include filename");
	    continue;
	}

	__parser_y_private.stack_ptr++;
	__parser_y_private.file[p] = f;
	__parser_y_private.stack[p] = YY_CURRENT_BUFFER;
	__parser_y_private.line[p] = 1;
	__parser_y_private.filename[p] = strdup(files.gl_pathv[i]);

	yy_switch_to_buffer(yy_create_buffer(f, YY_BUF_SIZE));
    }
    globfree(&files);
    return 0;
}

%}

%%

<<EOF>>	{
	if (__parser_y_private.filename[__parser_y_private.stack_ptr]) {
		free(__parser_y_private.filename[__parser_y_private.stack_ptr]);
		__parser_y_private.filename[__parser_y_private.stack_ptr] = NULL;
	}
	if (__parser_y_private.file[__parser_y_private.stack_ptr]) {
		fclose(__parser_y_private.file[__parser_y_private.stack_ptr]);
		__parser_y_private.file[__parser_y_private.stack_ptr] = NULL;
		yy_delete_buffer (YY_CURRENT_BUFFER);
		yy_switch_to_buffer
			(__parser_y_private.stack[__parser_y_private.stack_ptr]);
	}
	if (--__parser_y_private.stack_ptr < 0) {
		yyterminate();
	}
}

^[\t ]+			return FIRST_SPACES;

[\t ]+			/* ignore spaces in line */ ;

=				return EQUAL;

\n|#.*\n		{
					__parser_y_private.line[__parser_y_private.stack_ptr]++;
					return EOL;
				}

config			return CONFIG;
setup			return SETUP;
conn			return CONN;
ca			return CA;
include			return INCLUDE;
version			return FILE_VERSION;

[^\"= \t\n]+	{
					yylval.s = strdup(yytext);
					return STRING;
				}

\"[^\"\n]*\"	{
					yylval.s = strdup(yytext+1);
					if (yylval.s) yylval.s[strlen(yylval.s)-1]='\0';
					return STRING;
				}

.				yyerror(yytext);

%%

int yywrap(void)
{
    return 1;
}