1 /* $OpenBSD: parser.c,v 1.11 2019/12/18 09:18:28 florian Exp $ */
2
3 /*
4 * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
5 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <sys/types.h>
21 #include <sys/queue.h>
22 #include <sys/socket.h>
23 #include <netinet/in.h>
24 #include <arpa/inet.h>
25 #include <net/if.h>
26 #include <err.h>
27 #include <errno.h>
28 #include <event.h>
29 #include <imsg.h>
30 #include <limits.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34
35 #include "unwind.h"
36 #include "parser.h"
37
38 enum token_type {
39 NOTOKEN,
40 ENDTOKEN,
41 KEYWORD
42 };
43
44 struct token {
45 enum token_type type;
46 const char *keyword;
47 int value;
48 const struct token *next;
49 };
50
51 static const struct token t_main[];
52 static const struct token t_log[];
53 static const struct token t_status[];
54
55 static const struct token t_main[] = {
56 {KEYWORD, "reload", RELOAD, NULL},
57 {KEYWORD, "status", STATUS, t_status},
58 {KEYWORD, "log", NONE, t_log},
59 {ENDTOKEN, "", NONE, NULL}
60 };
61
62 static const struct token t_log[] = {
63 {KEYWORD, "debug", LOG_DEBUG, NULL},
64 {KEYWORD, "verbose", LOG_VERBOSE, NULL},
65 {KEYWORD, "brief", LOG_BRIEF, NULL},
66 {ENDTOKEN, "", NONE, NULL}
67 };
68
69 static const struct token t_status[] = {
70 {NOTOKEN, "", NONE, NULL},
71 {KEYWORD, "autoconf", AUTOCONF, NULL},
72 {KEYWORD, "memory", MEM, NULL},
73 {ENDTOKEN, "", NONE, NULL}
74 };
75
76 static const struct token *match_token(const char *, const struct token *,
77 struct parse_result *);
78 static void show_valid_args(const struct token *);
79
80 struct parse_result *
parse(int argc,char * argv[])81 parse(int argc, char *argv[])
82 {
83 static struct parse_result res;
84 const struct token *table = t_main;
85 const struct token *match;
86
87 memset(&res, 0, sizeof(res));
88
89 while (argc >= 0) {
90 if ((match = match_token(argv[0], table, &res)) == NULL) {
91 fprintf(stderr, "valid commands/args:\n");
92 show_valid_args(table);
93 return (NULL);
94 }
95
96 argc--;
97 argv++;
98
99 if (match->type == NOTOKEN || match->next == NULL)
100 break;
101
102 table = match->next;
103 }
104
105 if (argc > 0) {
106 fprintf(stderr, "superfluous argument: %s\n", argv[0]);
107 return (NULL);
108 }
109
110 return (&res);
111 }
112
113 static const struct token *
match_token(const char * word,const struct token * table,struct parse_result * res)114 match_token(const char *word, const struct token *table,
115 struct parse_result *res)
116 {
117 u_int i, match;
118 const struct token *t = NULL;
119
120 match = 0;
121
122 for (i = 0; table[i].type != ENDTOKEN; i++) {
123 switch (table[i].type) {
124 case NOTOKEN:
125 if (word == NULL || strlen(word) == 0) {
126 match++;
127 t = &table[i];
128 }
129 break;
130 case KEYWORD:
131 if (word != NULL && strncmp(word, table[i].keyword,
132 strlen(word)) == 0) {
133 match++;
134 t = &table[i];
135 if (t->value)
136 res->action = t->value;
137 }
138 break;
139 case ENDTOKEN:
140 break;
141 }
142 }
143
144 if (match != 1) {
145 if (word == NULL)
146 fprintf(stderr, "missing argument:\n");
147 else if (match > 1)
148 fprintf(stderr, "ambiguous argument: %s\n", word);
149 else if (match < 1)
150 fprintf(stderr, "unknown argument: %s\n", word);
151 return (NULL);
152 }
153
154 return (t);
155 }
156
157 static void
show_valid_args(const struct token * table)158 show_valid_args(const struct token *table)
159 {
160 int i;
161
162 for (i = 0; table[i].type != ENDTOKEN; i++) {
163 switch (table[i].type) {
164 case NOTOKEN:
165 fprintf(stderr, " <cr>\n");
166 break;
167 case KEYWORD:
168 fprintf(stderr, " %s\n", table[i].keyword);
169 break;
170 case ENDTOKEN:
171 break;
172 }
173 }
174 }
175