summaryrefslogtreecommitdiff
path: root/src/cfg_parse.y
blob: fb6d97bc95ea46e640dbdf54feff6367d19a96ed (plain) (blame)
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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
%{
/*
 *  tcpproxy
 *
 *  tcpproxy is a simple tcp connection proxy which combines the 
 *  features of rinetd and 6tunnel. tcpproxy supports IPv4 and 
 *  IPv6 and also supports connections from IPv6 to IPv4 
 *  endpoints and vice versa.
 *  
 *
 *  Copyright (C) 2010-2011 Christian Pointner <equinox@spreadspace.org>
 *                         
 *  This file is part of tcpproxy.
 *
 *  tcpproxy 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
 *  any later version.
 *
 *  tcpproxy 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 tcpproxy. If not, see <http://www.gnu.org/licenses/>.
 */

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

#include "datatypes.h"
#include "log.h"
#include "options.h"
#include "tcp.h"
#include "listener.h"

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

int line_cnt = 1;
options_t* gopt;
listeners_t* glisteners;

struct listener {
  char* la_;
  resolv_type_t lrt_;
  char* lp_;
  char* ra_;
  resolv_type_t rrt_;
  char* rp_;
  char* sa_;
};

static struct listener* new_listener_struct()
{
  struct listener* l = malloc(sizeof(struct listener));
  l->la_ = NULL;
  l->lrt_ = ANY;
  l->lp_ = NULL;
  l->ra_ = NULL;
  l->rrt_ = ANY;
  l->rp_ = NULL;
  l->sa_ = NULL;
}

static void clear_listener_struct(struct listener* l)
{
  if(l->la_)
    free(l->la_);
  if(l->lp_)
    free(l->lp_);
  if(l->ra_)
    free(l->ra_);
  if(l->rp_)
    free(l->rp_);
  if(l->sa_)
    free(l->sa_);

  free(l);
}

static void merge_listener_struct(struct listener* dest, struct listener* src)
{
  if(src->la_) {
    if(dest->la_)
      free(dest->la_);
    dest->la_ = src->la_;
  }
  
  if(src->lrt_ != ANY)
    dest->lrt_ = src->lrt_;

  if(src->lp_) {
    if(dest->lp_)
      free(dest->lp_);
    dest->lp_ = src->lp_;
  }

  if(src->ra_) {
    if(dest->ra_)
      free(dest->ra_);
    dest->ra_ = src->ra_;
  }

  if(src->rrt_ != ANY)
    dest->rrt_ = src->rrt_;

  if(src->rp_) {
    if(dest->rp_)
      free(dest->rp_);
    dest->rp_ = src->rp_;
  }

  if(src->sa_) {
    if(dest->sa_)
      free(dest->sa_);
    dest->sa_ = src->sa_;
  }

  free(src);
}


void yyinit(options_t* opt, listeners_t* listeners)
{
  gopt = opt;
  glisteners = listeners;
}

%}

%union 
{
  char null;
  char *string;
  int rtype;
  struct listener* listener;
}

%token <null> TOK_OPEN;
%token <null> TOK_CLOSE;
%token <null> TOK_COLON;
%token <null> TOK_SEMICOLON;
%token <null> TOK_ASTERISK;
%token <null> TOK_LISTEN;
%token <null> TOK_RESOLV;
%token <null> TOK_REMOTE;
%token <null> TOK_REMOTE_RESOLV;
%token <null> TOK_SOURCE;
%token <rtype> TOK_IPV4;
%token <rtype> TOK_IPV6;
%token <string> TOK_NUMBER;
%token <string> TOK_IPV4_ADDR;
%token <string> TOK_IPV6_ADDR;
%token <string> TOK_NAME;
%token <string> TOK_HOSTNAME;

%type <null> listen
%type <listener> listen_head
%type <listener> listen_body
%type <listener> listen_body_element
%type <listener> remote
%type <listener> source
%type <listener> resolv
%type <listener> remote_resolv
%type <rtype> resolv_type
%type <string> service
%type <string> host_or_addr
%%

cfg: 
               | cfg listen
               ;

listen:          listen_head TOK_OPEN listen_body TOK_CLOSE TOK_SEMICOLON
{
  merge_listener_struct($1, $3);

  int ret = listener_add(glisteners, $1->la_, $1->lrt_, $1->lp_, $1->ra_, $1->rrt_, $1->rp_, $1->sa_);
  clear_listener_struct($1);
  if(ret) {
    listener_clear(glisteners);
    options_clear(gopt);
    log_close();
    exit(-1);
  }
}
;

listen_head:     TOK_LISTEN host_or_addr service
{
  struct listener* l = new_listener_struct();
  l->la_ = $2;
  l->lp_ = $3;
  $$ = l;
}
               | TOK_LISTEN TOK_ASTERISK service
{
  struct listener* l = new_listener_struct();
  l->lp_ = $3;
  $$ = l;
}
;

listen_body:     listen_body_element
               | listen_body listen_body_element
{
  merge_listener_struct($1, $2);
  $$ = $1;
}
;

listen_body_element:    resolv TOK_SEMICOLON
                      | remote TOK_SEMICOLON
                      | remote_resolv TOK_SEMICOLON
                      | source TOK_SEMICOLON
                      ;

remote:          TOK_REMOTE TOK_COLON host_or_addr service
{
  struct listener* l = new_listener_struct();
  l->ra_ = $3;
  l->rp_ = $4;
  $$ = l;
}
;

source:          TOK_SOURCE TOK_COLON host_or_addr
{
  struct listener* l = new_listener_struct();
  l->sa_ = $3;
  $$ = l;
}
;

resolv:          TOK_RESOLV TOK_COLON resolv_type
{
  struct listener* l = new_listener_struct();
  l->lrt_ = $3;
  $$ = l;
}
;

remote_resolv:   TOK_REMOTE_RESOLV TOK_COLON resolv_type
{
  struct listener* l = new_listener_struct();
  l->rrt_ = $3;
  $$ = l;
}
;


resolv_type:     TOK_IPV4
               | TOK_IPV6
               ;

service:         TOK_NUMBER
               | TOK_NAME
               ;

host_or_addr:    TOK_NUMBER
               | TOK_NAME
               | TOK_HOSTNAME
               | TOK_IPV4_ADDR
               | TOK_IPV6_ADDR
               ;
%%

void yyerror (const char *string)
{
  log_printf(ERROR, "%s:%d %s\n", gopt->config_file_, line_cnt, string);
  listener_clear(glisteners);
  options_clear(gopt);
  log_close();
  exit(1);
}