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rndctl.c revision 1.20 
      1 /*	$NetBSD: rndctl.c,v 1.20 2011/08/27 18:48:59 joerg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997 Michael Graff.
      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  * 3. Neither the name of the author nor the names of other contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 #include <sys/cdefs.h>
     32 
     33 #ifndef lint
     34 __RCSID("$NetBSD: rndctl.c,v 1.20 2011/08/27 18:48:59 joerg Exp $");
     35 #endif
     36 
     37 
     38 #include <sys/types.h>
     39 #include <sys/ioctl.h>
     40 #include <sys/rnd.h>
     41 
     42 #include <stdio.h>
     43 #include <stdlib.h>
     44 #include <unistd.h>
     45 #include <fcntl.h>
     46 #include <errno.h>
     47 #include <err.h>
     48 #include <string.h>
     49 
     50 typedef struct {
     51 	const char *a_name;
     52 	u_int32_t a_type;
     53 } arg_t;
     54 
     55 static const arg_t source_types[] = {
     56 	{ "???",     RND_TYPE_UNKNOWN },
     57 	{ "disk",    RND_TYPE_DISK },
     58 	{ "net",     RND_TYPE_NET },
     59 	{ "tape",    RND_TYPE_TAPE },
     60 	{ "tty",     RND_TYPE_TTY },
     61 	{ "rng",     RND_TYPE_RNG },
     62 	{ NULL,      0 }
     63 };
     64 
     65 __dead static void usage(void);
     66 static u_int32_t find_type(const char *name);
     67 static const char *find_name(u_int32_t);
     68 static void do_ioctl(rndctl_t *);
     69 static char * strflags(u_int32_t);
     70 static void do_list(int, u_int32_t, char *);
     71 static void do_stats(void);
     72 
     73 static void
     74 usage(void)
     75 {
     76 
     77 	fprintf(stderr, "usage: %s -CEce [-d devname | -t devtype]\n",
     78 	    getprogname());
     79 	fprintf(stderr, "       %s -ls [-d devname | -t devtype]\n",
     80 	    getprogname());
     81 	exit(1);
     82 }
     83 
     84 static u_int32_t
     85 find_type(const char *name)
     86 {
     87 	const arg_t *a;
     88 
     89 	a = source_types;
     90 
     91 	while (a->a_name != NULL) {
     92 		if (strcmp(a->a_name, name) == 0)
     93 			return (a->a_type);
     94 		a++;
     95 	}
     96 
     97 	errx(1, "device name %s unknown", name);
     98 	return (0);
     99 }
    100 
    101 static const char *
    102 find_name(u_int32_t type)
    103 {
    104 	const arg_t *a;
    105 
    106 	a = source_types;
    107 
    108 	while (a->a_name != NULL) {
    109 		if (type == a->a_type)
    110 			return (a->a_name);
    111 		a++;
    112 	}
    113 
    114 	warnx("device type %u unknown", type);
    115 	return ("???");
    116 }
    117 
    118 static void
    119 do_ioctl(rndctl_t *rctl)
    120 {
    121 	int fd;
    122 	int res;
    123 
    124 	fd = open("/dev/urandom", O_RDONLY, 0644);
    125 	if (fd < 0)
    126 		err(1, "open");
    127 
    128 	res = ioctl(fd, RNDCTL, rctl);
    129 	if (res < 0)
    130 		err(1, "ioctl(RNDCTL)");
    131 
    132 	close(fd);
    133 }
    134 
    135 static char *
    136 strflags(u_int32_t fl)
    137 {
    138 	static char str[512];
    139 
    140 	str[0] = 0;
    141 	if (fl & RND_FLAG_NO_ESTIMATE)
    142 		;
    143 	else
    144 		strlcat(str, "estimate", sizeof(str));
    145 
    146 	if (fl & RND_FLAG_NO_COLLECT)
    147 		;
    148 	else {
    149 		if (str[0])
    150 			strlcat(str, ", ", sizeof(str));
    151 		strlcat(str, "collect", sizeof(str));
    152 	}
    153 
    154 	return (str);
    155 }
    156 
    157 #define HEADER "Source                 Bits Type      Flags\n"
    158 
    159 static void
    160 do_list(int all, u_int32_t type, char *name)
    161 {
    162 	rndstat_t rstat;
    163 	rndstat_name_t rstat_name;
    164 	int fd;
    165 	int res;
    166 	uint32_t i;
    167 	u_int32_t start;
    168 
    169 	fd = open("/dev/urandom", O_RDONLY, 0644);
    170 	if (fd < 0)
    171 		err(1, "open");
    172 
    173 	if (all == 0 && type == 0xff) {
    174 		strncpy(rstat_name.name, name, sizeof(rstat_name.name));
    175 		res = ioctl(fd, RNDGETSRCNAME, &rstat_name);
    176 		if (res < 0)
    177 			err(1, "ioctl(RNDGETSRCNAME)");
    178 		printf(HEADER);
    179 		printf("%-16s %10u %-4s %s\n",
    180 		    rstat_name.source.name,
    181 		    rstat_name.source.total,
    182 		    find_name(rstat_name.source.type),
    183 		    strflags(rstat_name.source.flags));
    184 		close(fd);
    185 		return;
    186 	}
    187 
    188 	/*
    189 	 * Run through all the devices present in the system, and either
    190 	 * print out ones that match, or print out all of them.
    191 	 */
    192 	printf(HEADER);
    193 	start = 0;
    194 	for (;;) {
    195 		rstat.count = RND_MAXSTATCOUNT;
    196 		rstat.start = start;
    197 		res = ioctl(fd, RNDGETSRCNUM, &rstat);
    198 		if (res < 0)
    199 			err(1, "ioctl(RNDGETSRCNUM)");
    200 
    201 		if (rstat.count == 0)
    202 			break;
    203 
    204 		for (i = 0; i < rstat.count; i++) {
    205 			if (all != 0 ||
    206 			    type == rstat.source[i].type)
    207 				printf("%-16s %10u %-4s %s\n",
    208 				    rstat.source[i].name,
    209 				    rstat.source[i].total,
    210 				    find_name(rstat.source[i].type),
    211 				    strflags(rstat.source[i].flags));
    212 		}
    213 		start += rstat.count;
    214 	}
    215 
    216 	close(fd);
    217 }
    218 
    219 static void
    220 do_stats(void)
    221 {
    222 	rndpoolstat_t rs;
    223 	int fd;
    224 
    225 	fd = open("/dev/urandom", O_RDONLY, 0644);
    226 	if (fd < 0)
    227 		err(1, "open");
    228 
    229 	if (ioctl(fd, RNDGETPOOLSTAT, &rs) < 0)
    230 		err(1, "ioctl(RNDGETPOOLSTAT)");
    231 
    232 	printf("\t%9u bits mixed into pool\n", rs.added);
    233 	printf("\t%9u bits currently stored in pool (max %u)\n",
    234 	    rs.curentropy, rs.maxentropy);
    235 	printf("\t%9u bits of entropy discarded due to full pool\n",
    236 	    rs.discarded);
    237 	printf("\t%9u hard-random bits generated\n", rs.removed);
    238 	printf("\t%9u pseudo-random bits generated\n", rs.generated);
    239 
    240 	close(fd);
    241 }
    242 
    243 int
    244 main(int argc, char **argv)
    245 {
    246 	rndctl_t rctl;
    247 	int ch, cmd, lflag, mflag, sflag;
    248 	u_int32_t type;
    249 	char name[16];
    250 
    251 	rctl.mask = 0;
    252 	rctl.flags = 0;
    253 
    254 	cmd = 0;
    255 	lflag = 0;
    256 	mflag = 0;
    257 	sflag = 0;
    258 	type = 0xff;
    259 
    260 	while ((ch = getopt(argc, argv, "CEcelt:d:s")) != -1) {
    261 		switch (ch) {
    262 		case 'C':
    263 			rctl.flags |= RND_FLAG_NO_COLLECT;
    264 			rctl.mask |= RND_FLAG_NO_COLLECT;
    265 			mflag++;
    266 			break;
    267 		case 'E':
    268 			rctl.flags |= RND_FLAG_NO_ESTIMATE;
    269 			rctl.mask |= RND_FLAG_NO_ESTIMATE;
    270 			mflag++;
    271 			break;
    272 		case 'c':
    273 			rctl.flags &= ~RND_FLAG_NO_COLLECT;
    274 			rctl.mask |= RND_FLAG_NO_COLLECT;
    275 			mflag++;
    276 			break;
    277 		case 'e':
    278 			rctl.flags &= ~RND_FLAG_NO_ESTIMATE;
    279 			rctl.mask |= RND_FLAG_NO_ESTIMATE;
    280 			mflag++;
    281 			break;
    282 		case 'l':
    283 			lflag++;
    284 			break;
    285 		case 't':
    286 			if (cmd != 0)
    287 				usage();
    288 			cmd = 't';
    289 
    290 			type = find_type(optarg);
    291 			break;
    292 		case 'd':
    293 			if (cmd != 0)
    294 				usage();
    295 			cmd = 'd';
    296 
    297 			type = 0xff;
    298 			strlcpy(name, optarg, sizeof(name));
    299 			break;
    300 		case 's':
    301 			sflag++;
    302 			break;
    303 		case '?':
    304 		default:
    305 			usage();
    306 		}
    307 	}
    308 	argc -= optind;
    309 	argv += optind;
    310 
    311 	/*
    312 	 * No leftover non-option arguments.
    313 	 */
    314 	if (argc > 0)
    315 		usage();
    316 
    317 	/*
    318 	 * Cannot list and modify at the same time.
    319 	 */
    320 	if ((lflag != 0 || sflag != 0) && mflag != 0)
    321 		usage();
    322 
    323 	/*
    324 	 * Bomb out on no-ops.
    325 	 */
    326 	if (lflag == 0 && mflag == 0 && sflag == 0)
    327 		usage();
    328 
    329 	/*
    330 	 * If not listing, we need a device name or a type.
    331 	 */
    332 	if (lflag == 0 && cmd == 0 && sflag == 0)
    333 		usage();
    334 
    335 	/*
    336 	 * Modify request.
    337 	 */
    338 	if (mflag != 0) {
    339 		rctl.type = type;
    340 		strncpy(rctl.name, name, sizeof(rctl.name));
    341 		do_ioctl(&rctl);
    342 
    343 		exit(0);
    344 	}
    345 
    346 	/*
    347 	 * List sources.
    348 	 */
    349 	if (lflag != 0)
    350 		do_list(cmd == 0, type, name);
    351 
    352 	if (sflag != 0)
    353 		do_stats();
    354 
    355 	exit(0);
    356 }
    357