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main.c revision 1.23 
      1 /*	$NetBSD: main.c,v 1.23 2016/09/05 01:09:57 sevan Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 #ifndef lint
     31 __RCSID("$NetBSD: main.c,v 1.23 2016/09/05 01:09:57 sevan Exp $");
     32 #endif /* !lint */
     33 
     34 #include <sys/module.h>
     35 #include <sys/param.h>
     36 #include <sys/sysctl.h>
     37 
     38 #include <err.h>
     39 #include <errno.h>
     40 #include <stdio.h>
     41 #include <stdlib.h>
     42 #include <string.h>
     43 #include <unistd.h>
     44 #include <stdbool.h>
     45 
     46 #include "prog_ops.h"
     47 
     48 static void	usage(void) __dead;
     49 static int	modstatcmp(const void *, const void *);
     50 
     51 static const char *classes[] = {
     52 	"any",
     53 	"misc",
     54 	"vfs",
     55 	"driver",
     56 	"exec",
     57 	"secmodel"
     58 };
     59 const unsigned int class_max = __arraycount(classes);
     60 
     61 static const char *sources[] = {
     62 	"builtin",
     63 	"boot",
     64 	"filesys",
     65 };
     66 const unsigned int source_max = __arraycount(sources);
     67 
     68 static const char *modflags[] = {
     69 	"-", "f", "a", "af"
     70 };
     71 
     72 int
     73 main(int argc, char **argv)
     74 {
     75 	struct iovec iov;
     76 	modstat_t *ms;
     77 	size_t len;
     78 	const char *name;
     79 	char sbuf[32];
     80 	int ch, rc, modauto = 1;
     81 	size_t maxnamelen = 16, i, modautolen;
     82 	char loadable = '\0';
     83 	bool address = false;
     84 
     85 	name = NULL;
     86 
     87 	while ((ch = getopt(argc, argv, "Aaekn:")) != -1) {
     88 		switch (ch) {
     89 		case 'A':			/* FALLTHROUGH */
     90 		case 'a':			/* FALLTHROUGH */
     91 		case 'e':
     92 			loadable = (char)ch;
     93 			break;
     94 		case 'k':
     95 			address = true;
     96 			break;
     97 		case 'n':
     98 			name = optarg;
     99 			break;
    100 		default:
    101 			usage();
    102 			/* NOTREACHED */
    103 		}
    104 	}
    105 
    106 	argc -= optind;
    107 	argv += optind;
    108 	if (argc == 1 && name == NULL)
    109 		name = argv[0];
    110 	else if (argc != 0)
    111 		usage();
    112 
    113 	if (prog_init && prog_init() == -1)
    114 		err(1, "prog init failed");
    115 
    116 	if (loadable == 'A' || loadable == 'a') {
    117 		if (prog_modctl(MODCTL_EXISTS, (void *)(uintptr_t)1)) {
    118 			switch (errno) {
    119 			case ENOSYS:
    120 				errx(EXIT_FAILURE, "The kernel was compiled "
    121 				    "without options MODULAR.");
    122 				break;
    123 			case EPERM:
    124 				errx(EXIT_FAILURE, "Modules can not be "
    125 				    "autoloaded right now.");
    126 				break;
    127 			default:
    128 				err(EXIT_FAILURE, "modctl_exists for autoload");
    129 				break;
    130 			}
    131 		} else {
    132 			if (loadable == 'A') {
    133 				modautolen = sizeof(modauto);
    134 				rc = sysctlbyname("kern.module.autoload",
    135 				    &modauto, &modautolen, NULL, 0);
    136 				if (rc != 0) {
    137 					err(EXIT_FAILURE, "sysctl "
    138 					    "kern.module.autoload failed.");
    139 				}
    140 			}
    141 			errx(EXIT_SUCCESS, "Modules can be autoloaded%s.",
    142 			modauto ? "" : ", but kern.module.autoload = 0");
    143 		}
    144 	}
    145 
    146 	if (loadable == 'e') {
    147 		if (prog_modctl(MODCTL_EXISTS, (void *)(uintptr_t)0)) {
    148 			switch (errno) {
    149 			case ENOSYS:
    150 				errx(EXIT_FAILURE, "The kernel was compiled "
    151 				    "without options MODULAR.");
    152 				break;
    153 			case EPERM:
    154 				errx(EXIT_FAILURE, "You are not allowed to "
    155 				    "load modules right now.");
    156 				break;
    157 			default:
    158 				err(EXIT_FAILURE, "modctl_exists for autoload");
    159 				break;
    160 			}
    161 		} else {
    162 			errx(EXIT_SUCCESS, "You can load modules.");
    163 		}
    164 	}
    165 
    166 	for (len = 8192;;) {
    167 		iov.iov_base = malloc(len);
    168 		iov.iov_len = len;
    169 		if (prog_modctl(MODCTL_STAT, &iov)) {
    170 			err(EXIT_FAILURE, "modctl(MODCTL_STAT)");
    171 		}
    172 		if (len >= iov.iov_len) {
    173 			break;
    174 		}
    175 		free(iov.iov_base);
    176 		len = iov.iov_len;
    177 	}
    178 
    179 	len = iov.iov_len / sizeof(modstat_t);
    180 	qsort(iov.iov_base, len, sizeof(modstat_t), modstatcmp);
    181 	for (i = 0, ms = iov.iov_base; i < len; i++, ms++) {
    182 		size_t namelen = strlen(ms->ms_name);
    183 		if (maxnamelen < namelen)
    184 			maxnamelen = namelen;
    185 	}
    186 	printf("%-*s %-8s %-8s %-4s %5s ",
    187 	    (int)maxnamelen, "NAME", "CLASS", "SOURCE", "FLAG", "REFS");
    188 	if (address)
    189 		printf("%-16s ", "ADDRESS");
    190 	printf("%7s %s \n", "SIZE", "REQUIRES");
    191 	for (ms = iov.iov_base; len != 0; ms++, len--) {
    192 		const char *class;
    193 		const char *source;
    194 
    195 		if (name != NULL && strcmp(ms->ms_name, name) != 0) {
    196 			continue;
    197 		}
    198 		if (ms->ms_required[0] == '\0') {
    199 			ms->ms_required[0] = '-';
    200 			ms->ms_required[1] = '\0';
    201 		}
    202 		if (ms->ms_size == 0) {
    203 			sbuf[0] = '-';
    204 			sbuf[1] = '\0';
    205 		} else {
    206 			snprintf(sbuf, sizeof(sbuf), "%u", ms->ms_size);
    207 		}
    208 		if (ms->ms_class <= class_max)
    209 			class = classes[ms->ms_class];
    210 		else
    211 			class = "UNKNOWN";
    212 		if (ms->ms_source < source_max)
    213 			source = sources[ms->ms_source];
    214 		else
    215 			source = "UNKNOWN";
    216 
    217 		printf("%-*s %-8s %-8s %-4s %5d ",
    218 		    (int)maxnamelen, ms->ms_name, class, source,
    219 		    modflags[ms->ms_flags & (__arraycount(modflags) - 1)],
    220 		    ms->ms_refcnt);
    221 		if (address)
    222 			printf("%-16" PRIx64 " ", ms->ms_addr);
    223 		printf("%7s %s\n", sbuf, ms->ms_required);
    224 	}
    225 
    226 	exit(EXIT_SUCCESS);
    227 }
    228 
    229 static void
    230 usage(void)
    231 {
    232 
    233 	(void)fprintf(stderr, "Usage: %s [-Aaen] [name]\n", getprogname());
    234 	exit(EXIT_FAILURE);
    235 }
    236 
    237 static int
    238 modstatcmp(const void *a, const void *b)
    239 {
    240 	const modstat_t *msa, *msb;
    241 
    242 	msa = a;
    243 	msb = b;
    244 
    245 	return strcmp(msa->ms_name, msb->ms_name);
    246 }
    247