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1 /*-
2  * Copyright (c) 2014 John Baldwin <jhb@FreeBSD.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/linker_set.h>
31 #include <devctl.h>
32 #include <err.h>
33 #include <errno.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <strings.h>
38 #include <unistd.h>
39
40 struct devctl_command {
41         const char *name;
42         int (*handler)(int ac, char **av);
43 };
44
45 #define DEVCTL_DATASET(name)    devctl_ ## name ## _table
46
47 #define DEVCTL_COMMAND(set, name, function)                             \
48         static struct devctl_command function ## _devctl_command =      \
49         { #name, function };                                            \
50         DATA_SET(DEVCTL_DATASET(set), function ## _devctl_command)
51
52 #define DEVCTL_TABLE(set, name)                                         \
53         SET_DECLARE(DEVCTL_DATASET(name), struct devctl_command);       \
54                                                                         \
55         static int                                                      \
56         devctl_ ## name ## _table_handler(int ac, char **av)            \
57         {                                                               \
58                 return (devctl_table_handler(SET_BEGIN(DEVCTL_DATASET(name)), \
59                     SET_LIMIT(DEVCTL_DATASET(name)), ac, av));          \
60         }                                                               \
61         DEVCTL_COMMAND(set, name, devctl_ ## name ## _table_handler)
62
63 static int      devctl_table_handler(struct devctl_command **start,
64     struct devctl_command **end, int ac, char **av);
65
66 SET_DECLARE(DEVCTL_DATASET(top), struct devctl_command);
67
68 DEVCTL_TABLE(top, set);
69
70 static void
71 usage(void)
72 {
73         fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n",
74             "usage: devctl attach device",
75             "       devctl detach [-f] device",
76             "       devctl disable [-f] device",
77             "       devctl enable device",
78             "       devctl set driver [-f] device driver");
79         exit(1);
80 }
81
82 static int
83 devctl_table_handler(struct devctl_command **start,
84     struct devctl_command **end, int ac, char **av)
85 {
86         struct devctl_command **cmd;
87
88         if (ac < 2) {
89                 warnx("The %s command requires a sub-command.", av[0]);
90                 return (EINVAL);
91         }
92         for (cmd = start; cmd < end; cmd++) {
93                 if (strcmp((*cmd)->name, av[1]) == 0)
94                         return ((*cmd)->handler(ac - 1, av + 1));
95         }
96
97         warnx("%s is not a valid sub-command of %s.", av[1], av[0]);
98         return (ENOENT);
99 }
100
101 static int
102 help(int ac __unused, char **av __unused)
103 {
104
105         usage();
106         return (0);
107 }
108 DEVCTL_COMMAND(top, help, help);
109
110 static int
111 attach(int ac, char **av)
112 {
113
114         if (ac != 2)
115                 usage();
116         if (devctl_attach(av[1]) < 0)
117                 err(1, "Failed to attach %s", av[1]);
118         return (0);
119 }
120 DEVCTL_COMMAND(top, attach, attach);
121
122 static void
123 detach_usage(void)
124 {
125
126         fprintf(stderr, "usage: devctl detach [-f] device\n");
127         exit(1);
128 }
129
130 static int
131 detach(int ac, char **av)
132 {
133         bool force;
134         int ch;
135
136         force = false;
137         while ((ch = getopt(ac, av, "f")) != -1)
138                 switch (ch) {
139                 case 'f':
140                         force = true;
141                         break;
142                 default:
143                         detach_usage();
144                 }
145         ac -= optind;
146         av += optind;
147
148         if (ac != 1)
149                 detach_usage();
150         if (devctl_detach(av[0], force) < 0)
151                 err(1, "Failed to detach %s", av[0]);
152         return (0);
153 }
154 DEVCTL_COMMAND(top, detach, detach);
155
156 static void
157 disable_usage(void)
158 {
159
160         fprintf(stderr, "usage: devctl disable [-f] device\n");
161         exit(1);
162 }
163
164 static int
165 disable(int ac, char **av)
166 {
167         bool force;
168         int ch;
169
170         force = false;
171         while ((ch = getopt(ac, av, "f")) != -1)
172                 switch (ch) {
173                 case 'f':
174                         force = true;
175                         break;
176                 default:
177                         disable_usage();
178                 }
179         ac -= optind;
180         av += optind;
181
182         if (ac != 1)
183                 disable_usage();
184         if (devctl_disable(av[0], force) < 0)
185                 err(1, "Failed to disable %s", av[0]);
186         return (0);
187 }
188 DEVCTL_COMMAND(top, disable, disable);
189
190 static int
191 enable(int ac, char **av)
192 {
193
194         if (ac != 2)
195                 usage();
196         if (devctl_enable(av[1]) < 0)
197                 err(1, "Failed to enable %s", av[1]);
198         return (0);
199 }
200 DEVCTL_COMMAND(top, enable, enable);
201
202 static void
203 set_driver_usage(void)
204 {
205
206         fprintf(stderr, "usage: devctl set driver [-f] device driver\n");
207         exit(1);
208 }
209
210 static int
211 set_driver(int ac, char **av)
212 {
213         bool force;
214         int ch;
215
216         force = false;
217         while ((ch = getopt(ac, av, "f")) != -1)
218                 switch (ch) {
219                 case 'f':
220                         force = true;
221                         break;
222                 default:
223                         set_driver_usage();
224                 }
225         ac -= optind;
226         av += optind;
227
228         if (ac != 2)
229                 set_driver_usage();
230         if (devctl_set_driver(av[0], av[1], force) < 0)
231                 err(1, "Failed to set %s driver to %s", av[0], av[1]);
232         return (0);
233 }
234 DEVCTL_COMMAND(set, driver, set_driver);
235
236 int
237 main(int ac, char *av[])
238 {
239         struct devctl_command **cmd;
240
241         if (ac == 1)
242                 usage();
243         ac--;
244         av++;
245
246         SET_FOREACH(cmd, DEVCTL_DATASET(top)) {
247                 if (strcmp((*cmd)->name, av[0]) == 0) {
248                         if ((*cmd)->handler(ac, av) != 0)
249                                 return (1);
250                         else
251                                 return (0);
252                 }
253         }
254         warnx("Unknown command %s.", av[0]);
255         return (1);
256 }