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
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
|
/* $OpenBSD: parser.c,v 1.7 2005/03/26 13:37:16 claudio Exp $ */
/*
* Copyright (c) 2004 Esben Norby <norby@openbsd.org>
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ospfd.h"
#include "parser.h"
enum token_type {
NOTOKEN,
ENDTOKEN,
KEYWORD,
ADDRESS,
FLAG,
PREFIX,
IFNAME
};
struct token {
enum token_type type;
const char *keyword;
int value;
const struct token *next;
};
static const struct token t_main[];
static const struct token t_show[];
static const struct token t_show_iface[];
static const struct token t_show_db[];
static const struct token t_show_area[];
static const struct token t_show_nbr[];
static const struct token t_show_rib[];
static const struct token t_show_fib[];
static const struct token t_main[] = {
/* {KEYWORD, "reload", RELOAD, NULL}, */
{KEYWORD, "show", SHOW, t_show},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "interfaces", SHOW_IFACE, t_show_iface},
{KEYWORD, "database", SHOW_DB, t_show_db},
{KEYWORD, "neighbor", SHOW_NBR, t_show_nbr},
{KEYWORD, "rib", SHOW_RIB, t_show_rib},
{KEYWORD, "fib", SHOW_FIB, t_show_fib},
{KEYWORD, "summary", SHOW_SUM, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show_iface[] = {
{NOTOKEN, "", NONE, NULL},
{IFNAME, "", NONE, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show_db[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "area", SHOW_DBBYAREA, t_show_area},
/* {KEYWORD, "router", NONE, NULL},
{KEYWORD, "network", NONE, NULL}, */
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show_area[] = {
{ADDRESS, "", NONE, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show_nbr[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "detail", SHOW_NBR_DTAIL, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show_rib[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "detail", SHOW_RIB_DTAIL, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show_fib[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "interface", SHOW_FIB_IFACE, t_show_iface},
{FLAG, "connected", F_CONNECTED, t_show_fib},
{FLAG, "static", F_STATIC, t_show_fib},
{FLAG, "ospf", F_OSPFD_INSERTED, t_show_fib},
{ADDRESS, "", NONE, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static struct parse_result res;
struct parse_result *
parse(int argc, char *argv[])
{
const struct token *table = t_main;
const struct token *match;
bzero(&res, sizeof(res));
while (argc > 0) {
if ((match = match_token(argv[0], table)) == NULL) {
fprintf(stderr, "valid commands/args:\n");
show_valid_args(table);
return (NULL);
}
argc--;
argv++;
if (match->type == NOTOKEN || match->next == NULL)
break;
table = match->next;
}
if (argc > 0) {
fprintf(stderr, "superfluous argument: %s\n", argv[0]);
return (NULL);
}
return (&res);
}
const struct token *
match_token(const char *word, const struct token table[])
{
u_int i, match;
const struct token *t = NULL;
match = 0;
for (i = 0; table[i].type != ENDTOKEN; i++) {
switch (table[i].type) {
case NOTOKEN:
if (word == NULL || strlen(word) == 0) {
match++;
t = &table[i];
}
break;
case KEYWORD:
if (word != NULL && strncmp(word, table[i].keyword,
strlen(word)) == 0) {
match++;
t = &table[i];
if (t->value)
res.action = t->value;
}
break;
case FLAG:
if (word != NULL && strncmp(word, table[i].keyword,
strlen(word)) == 0) {
match++;
t = &table[i];
res.flags |= t->value;
}
break;
case ADDRESS:
if (parse_addr(word, &res.addr)) {
match++;
t = &table[i];
if (t->value)
res.action = t->value;
}
break;
case PREFIX:
if (parse_prefix(word, &res.addr, &res.prefixlen)) {
match++;
t = &table[i];
if (t->value)
res.action = t->value;
}
break;
case IFNAME:
if (!match && word != NULL && strlen(word) > 0) {
if (strlcpy(res.ifname, word,
sizeof(res.ifname)) >=
sizeof(res.ifname))
err(1, "interface name too long");
match++;
t = &table[i];
}
break;
case ENDTOKEN:
break;
}
}
if (match != 1) {
if (match > 1)
fprintf(stderr, "ambiguous argument: %s\n", word);
if (match < 1)
fprintf(stderr, "unknown argument: %s\n", word);
return (NULL);
}
return (t);
}
void
show_valid_args(const struct token table[])
{
int i;
for (i = 0; table[i].type != ENDTOKEN; i++) {
switch (table[i].type) {
case NOTOKEN:
fprintf(stderr, " <cr>\n");
break;
case KEYWORD:
case FLAG:
fprintf(stderr, " %s\n", table[i].keyword);
break;
case ADDRESS:
fprintf(stderr, " <address>\n");
break;
case PREFIX:
fprintf(stderr, " <address>[/<len>]\n");
break;
case IFNAME:
fprintf(stderr, " <interface>\n");
case ENDTOKEN:
break;
}
}
}
int
parse_addr(const char *word, struct in_addr *addr)
{
struct in_addr ina;
if (word == NULL)
return (0);
bzero(addr, sizeof(struct in_addr));
bzero(&ina, sizeof(ina));
if (inet_pton(AF_INET, word, &ina)) {
addr->s_addr = ina.s_addr;
return (1);
}
return (0);
}
int
parse_prefix(const char *word, struct in_addr *addr, u_int8_t *prefixlen)
{
struct in_addr ina;
int bits = 32;
if (word == NULL)
return (0);
bzero(addr, sizeof(struct in_addr));
bzero(&ina, sizeof(ina));
if (strrchr(word, '/') != NULL) {
if ((bits = inet_net_pton(AF_INET, word,
&ina, sizeof(ina))) == -1)
return (0);
addr->s_addr = ina.s_addr & htonl(0xffffffff << (32 - bits));
*prefixlen = bits;
return (1);
} else {
*prefixlen = 32;
return (parse_addr(word, addr));
}
return (0);
}
|
