1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <sys/types.h>
27 #include <sys/mman.h>
28 #include <sys/stat.h>
29 #include <sys/wait.h>
30 #include <strings.h>
31 #include <unistd.h>
32 #include <errno.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <sys/modctl.h>
36 #include <zone.h>
37
38 void usage();
39 void exec_userfile(char *execfile, int id, char **envp);
40
41 extern void fatal(char *fmt, ...);
42 extern void error(char *fmt, ...);
43
44 /*
45 * Unload a loaded module.
46 */
47 int
main(int argc,char * argv[],char * envp[])48 main(int argc, char *argv[], char *envp[])
49 {
50 int child;
51 int status;
52 int id;
53 char *execfile = NULL;
54 int opt;
55 extern char *optarg;
56
57 if (argc < 3)
58 usage();
59
60 while ((opt = getopt(argc, argv, "i:e:")) != -1) {
61 switch (opt) {
62 case 'i':
63 if (sscanf(optarg, "%d", &id) != 1)
64 fatal("Invalid id %s\n", optarg);
65 break;
66 case 'e':
67 execfile = optarg;
68 }
69 }
70
71 if (getzoneid() != GLOBAL_ZONEID) {
72 fatal("modunload can only be run from the global zone\n");
73 }
74
75 if (execfile) {
76 child = fork();
77 if (child == -1)
78 error("can't fork %s", execfile);
79 else if (child == 0)
80 exec_userfile(execfile, id, envp);
81 else {
82 (void) wait(&status);
83 if (status != 0) {
84 (void) printf("%s returned error %d.\n",
85 execfile, status);
86 (void) exit(status >> 8);
87 }
88 }
89 }
90
91 /*
92 * Unload the module.
93 */
94 if (modctl(MODUNLOAD, id) < 0) {
95 if (errno == EPERM)
96 fatal("Insufficient privileges to unload a module\n");
97 else if (id != 0)
98 error("can't unload the module");
99 }
100
101 return (0); /* success */
102 }
103
104 /*
105 * exec the user file.
106 */
107 void
exec_userfile(char * execfile,int id,char ** envp)108 exec_userfile(char *execfile, int id, char **envp)
109 {
110 struct modinfo modinfo;
111
112 char modid[8];
113 char mod0[8];
114
115 modinfo.mi_id = modinfo.mi_nextid = id;
116 modinfo.mi_info = MI_INFO_ONE;
117 if (modctl(MODINFO, id, &modinfo) < 0)
118 error("can't get module information");
119
120 (void) sprintf(modid, "%d", id);
121 (void) sprintf(mod0, "%d", modinfo.mi_msinfo[0].msi_p0);
122
123 (void) execle(execfile, execfile, modid, mod0, NULL, envp);
124
125 error("couldn't exec %s\n", execfile);
126 }
127
128
129 void
usage()130 usage()
131 {
132 fatal("usage: modunload -i <module_id> [-e <exec_file>]\n");
133 }
134