Home | History | Annotate | Line # | Download | only in rndctl
rndctl.c revision 1.12 
      1 /*	$NetBSD: rndctl.c,v 1.12 2002/05/19 09:47:10 enami 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 
     32 #include <sys/types.h>
     33 #include <sys/ioctl.h>
     34 #include <sys/rnd.h>
     35 
     36 #include <stdio.h>
     37 #include <stdlib.h>
     38 #include <unistd.h>
     39 #include <fcntl.h>
     40 #include <errno.h>
     41 #include <err.h>
     42 #include <string.h>
     43 
     44 typedef struct {
     45 	char *a_name;
     46 	u_int32_t a_type;
     47 } arg_t;
     48 
     49 arg_t source_types[] = {
     50 	{ "???",     RND_TYPE_UNKNOWN },
     51 	{ "disk",    RND_TYPE_DISK },
     52 	{ "net",     RND_TYPE_NET },
     53 	{ "net",     RND_TYPE_NET },
     54 	{ "tape",    RND_TYPE_TAPE },
     55 	{ "tty",     RND_TYPE_TTY },
     56 	{ "rng",     RND_TYPE_RNG },
     57 	{ NULL,      0 }
     58 };
     59 
     60 static void usage(void);
     61 u_int32_t find_type(char *name);
     62 char *find_name(u_int32_t);
     63 void do_ioctl(rndctl_t *);
     64 char * strflags(u_int32_t);
     65 void do_list(int, u_int32_t, char *);
     66 void do_stats(void);
     67 
     68 static void
     69 usage(void)
     70 {
     71 
     72 	fprintf(stderr, "usage: %s -CEce [-t devtype] [-d devname]\n",
     73 	    getprogname());
     74 	fprintf(stderr, "       %s -ls [-t devtype] [-d devname]\n",
     75 	    getprogname());
     76 	exit(1);
     77 }
     78 
     79 u_int32_t
     80 find_type(char *name)
     81 {
     82 	arg_t *a;
     83 
     84 	a = source_types;
     85 
     86 	while (a->a_name != NULL) {
     87 		if (strcmp(a->a_name, name) == 0)
     88 			return (a->a_type);
     89 		a++;
     90 	}
     91 
     92 	errx(1, "device name %s unknown", name);
     93 	return (0);
     94 }
     95 
     96 char *
     97 find_name(u_int32_t type)
     98 {
     99 	arg_t *a;
    100 
    101 	a = source_types;
    102 
    103 	while (a->a_name != NULL) {
    104 		if (type == a->a_type)
    105 			return (a->a_name);
    106 		a++;
    107 	}
    108 
    109 	warnx("device type %u unknown", type);
    110 	return ("???");
    111 }
    112 
    113 void
    114 do_ioctl(rndctl_t *rctl)
    115 {
    116 	int fd;
    117 	int res;
    118 
    119 	fd = open("/dev/urandom", O_RDONLY, 0644);
    120 	if (fd < 0)
    121 		err(1, "open");
    122 
    123 	res = ioctl(fd, RNDCTL, rctl);
    124 	if (res < 0)
    125 		err(1, "ioctl(RNDCTL)");
    126 
    127 	close(fd);
    128 }
    129 
    130 char *
    131 strflags(u_int32_t fl)
    132 {
    133 	static char str[512];
    134 
    135 	str[0] = 0;
    136 	if (fl & RND_FLAG_NO_ESTIMATE)
    137 		;
    138 	else
    139 		strcat(str, "estimate");
    140 
    141 	if (fl & RND_FLAG_NO_COLLECT)
    142 		;
    143 	else {
    144 		if (str[0])
    145 			strcat(str, ", ");
    146 		strcat(str, "collect");
    147 	}
    148 
    149 	return (str);
    150 }
    151 
    152 #define HEADER "Source                 Bits Type      Flags\n"
    153 
    154 void
    155 do_list(int all, u_int32_t type, char *name)
    156 {
    157 	rndstat_t rstat;
    158 	rndstat_name_t rstat_name;
    159 	int fd;
    160 	int res;
    161 	u_int32_t start;
    162 
    163 	fd = open("/dev/urandom", O_RDONLY, 0644);
    164 	if (fd < 0)
    165 		err(1, "open");
    166 
    167 	if (all == 0 && type == 0xff) {
    168 		strncpy(rstat_name.name, name, 16);
    169 		res = ioctl(fd, RNDGETSRCNAME, &rstat_name);
    170 		if (res < 0)
    171 			err(1, "ioctl(RNDGETSRCNAME)");
    172 		printf(HEADER);
    173 		printf("%-16s %10u %-4s %s\n",
    174 		    rstat_name.source.name,
    175 		    rstat_name.source.total,
    176 		    find_name(rstat_name.source.type),
    177 		    strflags(rstat_name.source.flags));
    178 		close(fd);
    179 		return;
    180 	}
    181 
    182 	/*
    183 	 * Run through all the devices present in the system, and either
    184 	 * print out ones that match, or print out all of them.
    185 	 */
    186 	printf(HEADER);
    187 	start = 0;
    188 	for (;;) {
    189 		rstat.count = RND_MAXSTATCOUNT;
    190 		rstat.start = start;
    191 		res = ioctl(fd, RNDGETSRCNUM, &rstat);
    192 		if (res < 0)
    193 			err(1, "ioctl(RNDGETSRCNUM)");
    194 
    195 		if (rstat.count == 0)
    196 			break;
    197 
    198 		for (res = 0; res < rstat.count; res++) {
    199 			if (all != 0 ||
    200 			    type == rstat.source[res].type)
    201 				printf("%-16s %10u %-4s %s\n",
    202 				    rstat.source[res].name,
    203 				    rstat.source[res].total,
    204 				    find_name(rstat.source[res].type),
    205 				    strflags(rstat.source[res].flags));
    206 		}
    207 		start += rstat.count;
    208 	}
    209 
    210 	close(fd);
    211 }
    212 
    213 void
    214 do_stats()
    215 {
    216 	rndpoolstat_t rs;
    217 	int fd;
    218 
    219 	fd = open("/dev/urandom", O_RDONLY, 0644);
    220 	if (fd < 0)
    221 		err(1, "open");
    222 
    223 	if (ioctl(fd, RNDGETPOOLSTAT, &rs) < 0)
    224 		err(1, "ioctl(RNDGETPOOLSTAT)");
    225 
    226 	printf("\t%9u bits mixed into pool\n", rs.added);
    227 	printf("\t%9u bits currently stored in pool (max %u)\n",
    228 	    rs.curentropy, rs.maxentropy);
    229 	printf("\t%9u bits of entropy discarded due to full pool\n",
    230 	    rs.discarded);
    231 	printf("\t%9u hard-random bits generated\n", rs.removed);
    232 	printf("\t%9u pseudo-random bits generated\n", rs.generated);
    233 
    234 	close(fd);
    235 }
    236 
    237 int
    238 main(int argc, char **argv)
    239 {
    240 	rndctl_t rctl;
    241 	int ch, cmd, lflag, mflag, sflag;
    242 	u_int32_t type;
    243 	char name[16];
    244 
    245 	rctl.mask = 0;
    246 	rctl.flags = 0;
    247 
    248 	cmd = 0;
    249 	lflag = 0;
    250 	mflag = 0;
    251 	sflag = 0;
    252 	type = 0xff;
    253 
    254 	while ((ch = getopt(argc, argv, "CEcelt:d:s")) != -1)
    255 		switch (ch) {
    256 		case 'C':
    257 			rctl.flags |= RND_FLAG_NO_COLLECT;
    258 			rctl.mask |= RND_FLAG_NO_COLLECT;
    259 			mflag++;
    260 			break;
    261 		case 'E':
    262 			rctl.flags |= RND_FLAG_NO_ESTIMATE;
    263 			rctl.mask |= RND_FLAG_NO_ESTIMATE;
    264 			mflag++;
    265 			break;
    266 		case 'c':
    267 			rctl.flags &= ~RND_FLAG_NO_COLLECT;
    268 			rctl.mask |= RND_FLAG_NO_COLLECT;
    269 			mflag++;
    270 			break;
    271 		case 'e':
    272 			rctl.flags &= ~RND_FLAG_NO_ESTIMATE;
    273 			rctl.mask |= RND_FLAG_NO_ESTIMATE;
    274 			mflag++;
    275 			break;
    276 		case 'l':
    277 			lflag++;
    278 			break;
    279 		case 't':
    280 			if (cmd != 0)
    281 				usage();
    282 			cmd = 't';
    283 
    284 			type = find_type(optarg);
    285 			break;
    286 		case 'd':
    287 			if (cmd != 0)
    288 				usage();
    289 			cmd = 'd';
    290 
    291 			type = 0xff;
    292 			strncpy(name, optarg, 16);
    293 			break;
    294 		case 's':
    295 			sflag++;
    296 			break;
    297 		case '?':
    298 		default:
    299 			usage();
    300 		}
    301 
    302 	/*
    303 	 * Cannot list and modify at the same time.
    304 	 */
    305 	if ((lflag != 0 || sflag != 0) && mflag != 0)
    306 		usage();
    307 
    308 	/*
    309 	 * Bomb out on no-ops.
    310 	 */
    311 	if (lflag == 0 && mflag == 0 && sflag == 0)
    312 		usage();
    313 
    314 	/*
    315 	 * If not listing, we need a device name or a type.
    316 	 */
    317 	if (lflag == 0 && cmd == 0 && sflag == 0)
    318 		usage();
    319 
    320 	/*
    321 	 * Modify request.
    322 	 */
    323 	if (mflag != 0) {
    324 		rctl.type = type;
    325 		strncpy(rctl.name, name, 16);
    326 		do_ioctl(&rctl);
    327 
    328 		exit(0);
    329 	}
    330 
    331 	/*
    332 	 * List sources.
    333 	 */
    334 	if (lflag != 0)
    335 		do_list(cmd == 0, type, name);
    336 
    337 	if (sflag != 0)
    338 		do_stats();
    339 
    340 	exit(0);
    341 }
    342