parser.c revision 1.13 
1/*	$OpenBSD: parser.c,v 1.13 2007/09/28 13:29:56 pyr Exp $	*/
2
3/*
4 * Copyright (c) 2006 Pierre-Yves Ritschard <pyr@openbsd.org>
5 * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
6 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21#include <sys/types.h>
22#include <sys/socket.h>
23#include <sys/queue.h>
24#include <netinet/in.h>
25#include <net/if.h>
26#include <arpa/inet.h>
27#include <err.h>
28#include <errno.h>
29#include <limits.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <event.h>
34
35#include <openssl/ssl.h>
36
37#include "hoststated.h"
38
39#include "parser.h"
40
41enum token_type {
42	NOTOKEN,
43	ENDTOKEN,
44	HOSTID,
45	TABLEID,
46	SERVICEID,
47	KEYWORD
48};
49
50struct token {
51	enum token_type		 type;
52	const char		*keyword;
53	int			 value;
54	const struct token	*next;
55};
56
57static const struct token t_main[];
58static const struct token t_show[];
59static const struct token t_service[];
60static const struct token t_table[];
61static const struct token t_host[];
62static const struct token t_service_id[];
63static const struct token t_table_id[];
64static const struct token t_host_id[];
65
66static const struct token t_main[] = {
67	{KEYWORD,	"monitor",	MONITOR,	NULL},
68	{KEYWORD,	"show",		NULL,		t_show},
69	{KEYWORD,	"reload",	RELOAD,		NULL},
70	{KEYWORD,	"stop",		SHUTDOWN,	NULL},
71	{KEYWORD,	"service",	NONE,		t_service},
72	{KEYWORD,	"table",	NONE,		t_table},
73	{KEYWORD,	"host",		NONE,		t_host},
74	{ENDTOKEN,	"",		NONE,		NULL}
75};
76
77static const struct token t_show[] = {
78	{KEYWORD,	"summary",	SHOW_SUM,	NULL},
79	{KEYWORD,	"hosts",	SHOW_HOSTS,	NULL},
80	{KEYWORD,	"relays",	SHOW_RELAYS,	NULL},
81	{KEYWORD,	"sessions",	SHOW_SESSIONS,	NULL},
82	{ENDTOKEN,	"",		NONE,		NULL}
83};
84
85static const struct token t_service[] = {
86	{NOTOKEN,	"",		NONE,		NULL},
87	{KEYWORD,	"disable",	SERV_DISABLE,	t_service_id},
88	{KEYWORD,	"enable",	SERV_ENABLE,	t_service_id},
89	{ENDTOKEN,	"",		NONE,		NULL}
90};
91
92static const struct token t_table[] = {
93	{NOTOKEN,	"",		NONE,		NULL},
94	{KEYWORD,	"disable",	TABLE_DISABLE,	t_table_id},
95	{KEYWORD,	"enable",	TABLE_ENABLE,	t_table_id},
96	{ENDTOKEN,	"",		NONE,		NULL}
97};
98
99static const struct token t_host[] = {
100	{NOTOKEN,	"",		NONE,		NULL},
101	{KEYWORD,	"disable",	HOST_DISABLE,	t_host_id},
102	{KEYWORD,	"enable",	HOST_ENABLE,	t_host_id},
103	{ENDTOKEN,	"",		NONE,		NULL}
104};
105
106static const struct token t_service_id[] = {
107	{SERVICEID,	"",		NONE,		NULL},
108	{ENDTOKEN,	"",		NONE,		NULL}
109};
110
111static const struct token t_table_id[] = {
112	{TABLEID,	"",		NONE,		NULL},
113	{ENDTOKEN,	"",		NONE,		NULL}
114};
115
116static const struct token t_host_id[] = {
117	{HOSTID,	"",		NONE,		NULL},
118	{ENDTOKEN,	"",		NONE,		NULL}
119};
120
121static struct parse_result	res;
122
123struct parse_result *
124parse(int argc, char *argv[])
125{
126	const struct token	*table = t_main;
127	const struct token	*match;
128
129	bzero(&res, sizeof(res));
130
131	while (argc >= 0) {
132		if ((match = match_token(argv[0], table)) == NULL) {
133			fprintf(stderr, "valid commands/args:\n");
134			show_valid_args(table);
135			return (NULL);
136		}
137
138		argc--;
139		argv++;
140
141		if (match->type == NOTOKEN || match->next == NULL)
142			break;
143
144		table = match->next;
145	}
146
147	if (argc > 0) {
148		fprintf(stderr, "superfluous argument: %s\n", argv[0]);
149		return (NULL);
150	}
151
152	return (&res);
153}
154
155const struct token *
156match_token(const char *word, const struct token table[])
157{
158	u_int			 i, match;
159	const struct token	*t = NULL;
160	const char		*errstr;
161
162	match = 0;
163
164	for (i = 0; table[i].type != ENDTOKEN; i++) {
165		switch (table[i].type) {
166		case NOTOKEN:
167			if (word == NULL || strlen(word) == 0) {
168				match++;
169				t = &table[i];
170			}
171			break;
172		case KEYWORD:
173			if (word != NULL && strncmp(word, table[i].keyword,
174			    strlen(word)) == 0) {
175				match++;
176				t = &table[i];
177				if (t->value)
178					res.action = t->value;
179			}
180			break;
181		case HOSTID:
182			if (word == NULL)
183				break;
184			res.id.id = strtonum(word, 0, UINT_MAX, &errstr);
185			if (errstr) {
186				strlcpy(res.id.name, word, sizeof(res.id.name));
187				res.id.id = EMPTY_ID;
188			}
189			t = &table[i];
190			match++;
191			break;
192		case TABLEID:
193			if (word == NULL)
194				break;
195			res.id.id = strtonum(word, 0, UINT_MAX, &errstr);
196			if (errstr) {
197				strlcpy(res.id.name, word, sizeof(res.id.name));
198				res.id.id = EMPTY_ID;
199			}
200			t = &table[i];
201			match++;
202			break;
203		case SERVICEID:
204			if (word == NULL)
205				break;
206			res.id.id = strtonum(word, 0, UINT_MAX, &errstr);
207			if (errstr) {
208				strlcpy(res.id.name, word, sizeof(res.id.name));
209				res.id.id = EMPTY_ID;
210			}
211			t = &table[i];
212			match++;
213			break;
214		case ENDTOKEN:
215			break;
216		}
217	}
218
219	if (match != 1) {
220		if (word == NULL)
221			fprintf(stderr, "missing argument:\n");
222		else if (match > 1)
223			fprintf(stderr, "ambiguous argument: %s\n", word);
224		else if (match < 1)
225			fprintf(stderr, "unknown argument: %s\n", word);
226		return (NULL);
227	}
228
229	return (t);
230}
231
232void
233show_valid_args(const struct token table[])
234{
235	int	i;
236
237	for (i = 0; table[i].type != ENDTOKEN; i++) {
238		switch (table[i].type) {
239		case NOTOKEN:
240			fprintf(stderr, "  <cr>\n");
241			break;
242		case KEYWORD:
243			fprintf(stderr, "  %s\n", table[i].keyword);
244			break;
245		case SERVICEID:
246			fprintf(stderr, "  <serviceid>\n");
247			break;
248		case TABLEID:
249			fprintf(stderr, "  <tableid>\n");
250			break;
251		case HOSTID:
252			fprintf(stderr, "  <hostid>\n");
253			break;
254		case ENDTOKEN:
255			break;
256		}
257	}
258}
259