1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
%{
/*
* Copyright (C) 2013-2014 Tobias Brunner
* HSR Hochschule fuer Technik Rapperswil
*
* 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.
*/
#define _GNU_SOURCE /* for asprintf() */
#include <stdio.h>
#include <utils/parser_helper.h>
#include <settings/settings_types.h>
#include <parser/conf_parser.h>
#include "parser.h"
#define YYDEBUG 1
/**
* Defined by the lexer
*/
int conf_parser_lex(YYSTYPE *lvalp, void *scanner);
int conf_parser_lex_init_extra(parser_helper_t *extra, void *scanner);
int conf_parser_lex_destroy(void *scanner);
int conf_parser_set_in(FILE *in, void *scanner);
void conf_parser_set_debug(int debug, void *scanner);
char *conf_parser_get_text(void *scanner);
int conf_parser_get_leng(void *scanner);
int conf_parser_get_lineno(void *scanner);
/* Custom functions in lexer */
bool conf_parser_open_next_file(parser_helper_t *ctx);
/**
* Forward declaration
*/
static void conf_parser_error(parser_helper_t *ctx, const char *s);
/**
* Make sure to call lexer with the proper context
*/
#undef yylex
static int yylex(YYSTYPE *lvalp, parser_helper_t *ctx)
{
return conf_parser_lex(lvalp, ctx->scanner);
}
%}
%debug
/* generate verbose error messages */
%error-verbose
/* generate a reentrant parser */
%define api.pure
/* prefix function/variable declarations */
%name-prefix "conf_parser_"
/* interact properly with the reentrant lexer */
%lex-param {parser_helper_t *ctx}
%parse-param {parser_helper_t *ctx}
/* types for terminal symbols... */
%union {
char *s;
conf_parser_section_t t;
}
%token <s> STRING
%token EQ SPACES NEWLINE CONFIG_SETUP CONN CA STRING_ERROR
/* ...and other symbols */
%type <t> section_type
%type <s> section_name value
/* make the equal sign left associative */
%left EQ
/* properly destroy STRING tokens, which are strdup()ed, on errors */
%destructor { free($$); } STRING section_name value
/* there are two shift/reduce conflicts because we allow empty lines (and lines
* with spaces) within settings and anywhere else (i.e. in the beginning) */
//%expect 2
%%
/**
* ipsec.conf grammar rules
*/
statements:
/* empty */
| statements NEWLINE
| statements statement
;
statement:
section
| SPACES setting
;
section:
section_type section_name
{
if ($1 != CONF_PARSER_CONFIG_SETUP && (!$2 || !strlen($2)))
{
PARSER_DBG1(ctx, "section name missing");
free($2);
YYERROR;
}
conf_parser_t *parser = (conf_parser_t*)ctx->context;
parser->add_section(parser, $1, $2);
}
;
section_type:
CONFIG_SETUP
{
$$ = CONF_PARSER_CONFIG_SETUP;
}
|
CONN
{
$$ = CONF_PARSER_CONN;
}
|
CA
{
$$ = CONF_PARSER_CA;
}
;
section_name:
/* empty */
{
$$ = NULL;
}
| STRING
{
$$ = $1;
}
;
setting:
/* empty */
|
STRING EQ value
{
if (!strlen($1))
{
PARSER_DBG1(ctx, "setting name can't be empty");
free($1);
free($3);
YYERROR;
}
conf_parser_t *parser = (conf_parser_t*)ctx->context;
parser->add_setting(parser, $1, $value);
}
|
STRING EQ
{
if (!strlen($1))
{
PARSER_DBG1(ctx, "setting name can't be empty");
free($1);
YYERROR;
}
conf_parser_t *parser = (conf_parser_t*)ctx->context;
parser->add_setting(parser, $1, NULL);
}
|
STRING
{
PARSER_DBG1(ctx, "missing value for setting '%s'", $1);
free($1);
YYERROR;
}
;
value:
STRING
| value STRING
{ /* just put a single space between them, use strings for more */
if (asprintf(&$$, "%s %s", $1, $2) < 0)
{
free($1);
free($2);
YYERROR;
}
free($1);
free($2);
}
;
%%
/**
* Referenced by the generated parser
*/
static void conf_parser_error(parser_helper_t *ctx, const char *s)
{
char *text = conf_parser_get_text(ctx->scanner);
int len = conf_parser_get_leng(ctx->scanner);
if (len && text[len-1] == '\n')
{ /* cut off newline at the end to avoid muti-line log messages */
len--;
}
PARSER_DBG1(ctx, "%s [%.*s]", s, (int)len, text);
}
/**
* Parse the given file
*/
bool conf_parser_parse_file(conf_parser_t *this, char *name)
{
parser_helper_t *helper;
bool success = FALSE;
helper = parser_helper_create(this);
helper->get_lineno = conf_parser_get_lineno;
if (conf_parser_lex_init_extra(helper, &helper->scanner) != 0)
{
helper->destroy(helper);
return FALSE;
}
helper->file_include(helper, name);
if (!conf_parser_open_next_file(helper))
{
DBG1(DBG_CFG, "failed to open config file '%s'", name);
}
else
{
if (getenv("DEBUG_CONF_PARSER"))
{
yydebug = 1;
conf_parser_set_debug(1, helper->scanner);
}
success = yyparse(helper) == 0;
if (!success)
{
DBG1(DBG_CFG, "invalid config file '%s'", name);
}
}
conf_parser_lex_destroy(helper->scanner);
helper->destroy(helper);
return success;
}
|
