1 /* $OpenBSD: parser.c,v 1.4 2018/10/15 11:30:01 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 <sys/uio.h>
24 #include <netinet/in.h>
25 #include <err.h>
26 #include <errno.h>
27 #include <event.h>
28 #include <limits.h>
29 #include <netdb.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <unistd.h>
34
35 #include "iscsid.h"
36 #include "iscsictl.h"
37
38 enum token_type {
39 NOTOKEN,
40 ENDTOKEN,
41 KEYWORD,
42 ADDRESS,
43 NAME,
44 FLAG
45 };
46
47 struct token {
48 enum token_type type;
49 const char *keyword;
50 int value;
51 const struct token *next;
52 };
53
54 static const struct token t_main[];
55 static const struct token t_show[];
56 static const struct token t_log[];
57 static const struct token t_discovery[];
58 static const struct token t_session[];
59 static const struct token t_vscsi[];
60
61 static const struct token t_main[] = {
62 {KEYWORD, "reload", RELOAD, NULL},
63 {KEYWORD, "discover", DISCOVERY, t_discovery},
64 {KEYWORD, "show", SHOW_SUM, t_show},
65 {KEYWORD, "log", NONE, t_log},
66 {ENDTOKEN, "", NONE, NULL}
67 };
68
69 static const struct token t_show[] = {
70 {NOTOKEN, "", NONE, NULL},
71 {KEYWORD, "summary", SHOW_SUM, NULL},
72 {KEYWORD, "session", SHOW_SESS, t_session},
73 {KEYWORD, "vscsi", NONE, t_vscsi},
74 {ENDTOKEN, "", NONE, NULL}
75 };
76
77 static const struct token t_log[] = {
78 {KEYWORD, "verbose", LOG_VERBOSE, NULL},
79 {KEYWORD, "brief", LOG_BRIEF, NULL},
80 {ENDTOKEN, "", NONE, NULL}
81 };
82
83 static const struct token t_discovery[] = {
84 {ADDRESS, "", NONE, NULL},
85 {ENDTOKEN, "", NONE, NULL}
86 };
87
88 static const struct token t_session[] = {
89 {NAME, "", NONE, NULL},
90 {ENDTOKEN, "", NONE, NULL}
91 };
92
93 static const struct token t_vscsi[] = {
94 {KEYWORD, "stats", SHOW_VSCSI_STATS, NULL},
95 {ENDTOKEN, "", NONE, NULL}
96 };
97
98 static struct parse_result res;
99
100 struct parse_result *
parse(int argc,char * argv[])101 parse(int argc, char *argv[])
102 {
103 const struct token *table = t_main;
104 const struct token *match;
105
106 bzero(&res, sizeof(res));
107
108 while (argc >= 0) {
109 if ((match = match_token(argv[0], table)) == NULL) {
110 fprintf(stderr, "valid commands/args:\n");
111 show_valid_args(table);
112 return (NULL);
113 }
114
115 argc--;
116 argv++;
117
118 if (match->type == NOTOKEN || match->next == NULL)
119 break;
120
121 table = match->next;
122 }
123
124 if (argc > 0) {
125 fprintf(stderr, "superfluous argument: %s\n", argv[0]);
126 return (NULL);
127 }
128
129 return (&res);
130 }
131
132 const struct token *
match_token(const char * word,const struct token * table)133 match_token(const char *word, const struct token *table)
134 {
135 u_int i, match;
136 const struct token *t = NULL;
137
138 match = 0;
139
140 for (i = 0; table[i].type != ENDTOKEN; i++) {
141 switch (table[i].type) {
142 case NOTOKEN:
143 if (word == NULL || strlen(word) == 0) {
144 match++;
145 t = &table[i];
146 }
147 break;
148 case KEYWORD:
149 if (word != NULL && strncmp(word, table[i].keyword,
150 strlen(word)) == 0) {
151 match++;
152 t = &table[i];
153 if (t->value)
154 res.action = t->value;
155 }
156 break;
157 case FLAG:
158 if (word != NULL && strncmp(word, table[i].keyword,
159 strlen(word)) == 0) {
160 match++;
161 t = &table[i];
162 res.flags |= t->value;
163 }
164 break;
165 case ADDRESS:
166 if (!parse_addr(word, &res.addr)) {
167 match++;
168 t = &table[i];
169 if (t->value)
170 res.action = t->value;
171 }
172 break;
173 case NAME:
174 if (word != NULL && strlen(word) > 0) {
175 if (strlcpy(res.name, word, sizeof(res.name)) >=
176 sizeof(res.name))
177 errx(1, "name too long");
178 match++;
179 t = &table[i];
180 }
181 break;
182 case ENDTOKEN:
183 break;
184 }
185 }
186
187 if (match != 1) {
188 if (word == NULL)
189 fprintf(stderr, "missing argument:\n");
190 else if (match > 1)
191 fprintf(stderr, "ambiguous argument: %s\n", word);
192 else if (match < 1)
193 fprintf(stderr, "unknown argument: %s\n", word);
194 return (NULL);
195 }
196
197 return (t);
198 }
199
200 void
show_valid_args(const struct token * table)201 show_valid_args(const struct token *table)
202 {
203 int i;
204
205 for (i = 0; table[i].type != ENDTOKEN; i++) {
206 switch (table[i].type) {
207 case NOTOKEN:
208 fprintf(stderr, " <cr>\n");
209 break;
210 case KEYWORD:
211 case FLAG:
212 fprintf(stderr, " %s\n", table[i].keyword);
213 break;
214 case ADDRESS:
215 fprintf(stderr, " <address>\n");
216 break;
217 case NAME:
218 fprintf(stderr, " <name>\n");
219 break;
220 case ENDTOKEN:
221 break;
222 }
223 }
224 }
225
226 int
parse_addr(const char * word,struct sockaddr_storage * sa)227 parse_addr(const char *word, struct sockaddr_storage *sa)
228 {
229 struct addrinfo hints, *addrs;
230 int rv;
231
232 bzero(&hints, sizeof(hints));
233 hints.ai_family = PF_UNSPEC;
234 hints.ai_socktype = SOCK_STREAM;
235 hints.ai_protocol = IPPROTO_TCP;
236
237 if ((rv = getaddrinfo(word, "iscsi", &hints, &addrs)) == 0) {
238 bcopy(addrs->ai_addr, sa, addrs->ai_addrlen);
239 freeaddrinfo(addrs);
240 return (0);
241 }
242
243 errx(1, "parse_host: %s", gai_strerror(rv));
244 }
245