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cap_mkdb.c revision 1.19 
      1 /*	$NetBSD: cap_mkdb.c,v 1.19 2003/10/16 06:43:52 itojun Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  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 University nor the names of its 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 REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, 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 #if HAVE_CONFIG_H
     33 #include "config.h"
     34 #endif
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(__COPYRIGHT) && !defined(lint)
     38 __COPYRIGHT("@(#) Copyright (c) 1992, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #if defined(__RCSID) && !defined(lint)
     43 #if 0
     44 static char sccsid[] = "@(#)cap_mkdb.c	8.2 (Berkeley) 4/27/95";
     45 #endif
     46 __RCSID("$NetBSD: cap_mkdb.c,v 1.19 2003/10/16 06:43:52 itojun Exp $");
     47 #endif /* not lint */
     48 
     49 #include <sys/param.h>
     50 #include <sys/stat.h>
     51 
     52 #include <db.h>
     53 #include <err.h>
     54 #include <fcntl.h>
     55 #include <stdio.h>
     56 #include <stdlib.h>
     57 #include <string.h>
     58 #include <unistd.h>
     59 #include <ctype.h>
     60 
     61 static void	db_build (char **);
     62 static void	dounlink (void);
     63 static void	usage (void);
     64 static int	count_records(char **);
     65 
     66 DB *capdbp;
     67 int verbose;
     68 char *capdb, *capname, buf[8 * 1024];
     69 
     70 HASHINFO openinfo = {
     71 	4096,		/* bsize */
     72 	16,		/* ffactor */
     73 	2048,		/* nelem */
     74 	2048 * 1024,	/* cachesize */
     75 	NULL,		/* hash() */
     76 	0		/* lorder */
     77 };
     78 
     79 /*
     80  * Mkcapdb creates a capability hash database for quick retrieval of capability
     81  * records.  The database contains 2 types of entries: records and references
     82  * marked by the first byte in the data.  A record entry contains the actual
     83  * capability record whereas a reference contains the name (key) under which
     84  * the correct record is stored.
     85  */
     86 int
     87 main(int argc, char *argv[])
     88 {
     89 	int c, byteorder;
     90 
     91 	capname = NULL;
     92 	byteorder = 0;
     93 	while ((c = getopt(argc, argv, "bf:lv")) != -1) {
     94 		switch(c) {
     95 		case 'b':
     96 		case 'l':
     97 			if (byteorder != 0)
     98 				usage();
     99 			byteorder = c == 'b' ? 4321 : 1234;
    100 			break;
    101 		case 'f':
    102 			capname = optarg;
    103 			break;
    104 		case 'v':
    105 			verbose = 1;
    106 			break;
    107 		case '?':
    108 		default:
    109 			usage();
    110 		}
    111 	}
    112 	argc -= optind;
    113 	argv += optind;
    114 
    115 	if (*argv == NULL)
    116 		usage();
    117 
    118 	/* Set byte order */
    119 	openinfo.lorder = byteorder;
    120 
    121 	/*
    122 	 * Set nelem to twice the value returned by count_record().
    123 	 */
    124 	openinfo.nelem = count_records(argv) << 1;
    125 
    126 	/*
    127 	 * The database file is the first argument if no name is specified.
    128 	 * Make arrangements to unlink it if exit badly.
    129 	 */
    130 	(void)snprintf(buf, sizeof(buf), "%s.db", capname ? capname : *argv);
    131 	if ((capname = strdup(buf)) == NULL)
    132 		err(1, "strdup");
    133 	if ((capdbp = dbopen(capname, O_CREAT | O_TRUNC | O_RDWR,
    134 	    DEFFILEMODE, DB_HASH, &openinfo)) == NULL)
    135 		err(1, "%s", buf);
    136 
    137 	if (atexit(dounlink))
    138 		err(1, "atexit");
    139 
    140 	db_build(argv);
    141 
    142 	if (capdbp->close(capdbp) < 0)
    143 		err(1, "%s", capname);
    144 	capname = NULL;
    145 	exit(0);
    146 }
    147 
    148 static void
    149 dounlink(void)
    150 {
    151 	if (capname != NULL)
    152 		(void)unlink(capname);
    153 }
    154 
    155 /*
    156  * Any changes to these definitions should be made also in the getcap(3)
    157  * library routines.
    158  */
    159 #define RECOK	(char)0
    160 #define TCERR	(char)1
    161 #define SHADOW	(char)2
    162 
    163 /*
    164  * Db_build() builds the name and capabilty databases according to the
    165  * details above.
    166  */
    167 static void
    168 db_build(char **ifiles)
    169 {
    170 	DBT key, data;
    171 	recno_t reccnt;
    172 	size_t len, bplen;
    173 	int st;
    174 	char *bp, *p, *t, *n;
    175 
    176 	data.data = NULL;
    177 	key.data = NULL;
    178 	for (reccnt = 0, bplen = 0; (st = cgetnext(&bp, ifiles)) > 0; free(bp)){
    179 
    180 		/*
    181 		 * Allocate enough memory to store record, terminating
    182 		 * NULL and one extra byte.
    183 		 */
    184 		len = strlen(bp);
    185 		if (bplen <= len + 2) {
    186 			if ((n = realloc(data.data,
    187 			    bplen + MAX(256, len + 2))) == NULL)
    188 				err(1, "realloc");
    189 			data.data = n;
    190 			bplen += MAX(256, len + 2);
    191 		}
    192 
    193 		/* Find the end of the name field. */
    194 		if ((p = strchr(bp, ':')) == NULL) {
    195 			warnx("no name field: %.*s", (int)(MIN(len, 20)), bp);
    196 			continue;
    197 		}
    198 
    199 		/* First byte of stored record indicates status. */
    200 		switch(st) {
    201 		case 1:
    202 			((char *)(data.data))[0] = RECOK;
    203 			break;
    204 		case 2:
    205 			((char *)(data.data))[0] = TCERR;
    206 			warnx("Record not tc expanded: %.*s", (int)(p - bp),bp);
    207 			break;
    208 		}
    209 
    210 		/* Create the stored record. */
    211 		memmove(&((u_char *)(data.data))[1], bp, len + 1);
    212 		data.size = len + 2;
    213 
    214 		/* Store the record under the name field. */
    215 		key.data = bp;
    216 		key.size = p - bp;
    217 
    218 		switch(capdbp->put(capdbp, &key, &data, R_NOOVERWRITE)) {
    219 		case -1:
    220 			err(1, "put");
    221 			/* NOTREACHED */
    222 		case 1:
    223 			warnx("ignored duplicate: %.*s",
    224 			    (int)key.size, (char *)key.data);
    225 			continue;
    226 		}
    227 		++reccnt;
    228 
    229 		/* If only one name, ignore the rest. */
    230 		if ((p = strchr(bp, '|')) == NULL)
    231 			continue;
    232 
    233 		/* The rest of the names reference the entire name. */
    234 		((char *)(data.data))[0] = SHADOW;
    235 		memmove(&((u_char *)(data.data))[1], key.data, key.size);
    236 		data.size = key.size + 1;
    237 
    238 		/* Store references for other names. */
    239 		for (p = t = bp;; ++p) {
    240 			if (p > t && (*p == ':' || *p == '|')) {
    241 				key.size = p - t;
    242 				key.data = t;
    243 				switch(capdbp->put(capdbp,
    244 				    &key, &data, R_NOOVERWRITE)) {
    245 				case -1:
    246 					err(1, "put");
    247 					/* NOTREACHED */
    248 				case 1:
    249 					warnx("ignored duplicate: %.*s",
    250 					    (int)key.size, (char *)key.data);
    251 				}
    252 				t = p + 1;
    253 			}
    254 			if (*p == ':')
    255 				break;
    256 		}
    257 	}
    258 
    259 	switch(st) {
    260 	case -1:
    261 		err(1, "file argument");
    262 		/* NOTREACHED */
    263 	case -2:
    264 		errx(1, "potential reference loop detected");
    265 		/* NOTREACHED */
    266 	}
    267 
    268 	if (verbose)
    269 		(void)printf("cap_mkdb: %d capability records\n", reccnt);
    270 }
    271 
    272 static void
    273 usage(void)
    274 {
    275 	(void)fprintf(stderr,
    276 	    "usage: cap_mkdb [-b|-l] [-v] [-f outfile] file1 [file2 ...]\n");
    277 	exit(1);
    278 }
    279 
    280 /*
    281  * Count number of records in input files. This does not need
    282  * to be really accurate (the result is used only as a hint).
    283  * It seems to match number of records should a cgetnext() be used, though.
    284  */
    285 static int
    286 count_records(char **list)
    287 {
    288 	FILE *fp;
    289 	char *line;
    290 	size_t len;
    291 	int nelem, slash;
    292 
    293 	/* scan input files and count individual records */
    294 	for(nelem = 0, slash = 0; *list && (fp = fopen(*list++, "r")); ) {
    295 		while((line = fgetln(fp, &len))) {
    296 			if (len < 2)
    297 				continue;
    298 			if (!isspace((unsigned char) *line) && *line != ':'
    299 				&& *line != '#' && !slash)
    300 				nelem++;
    301 
    302 			slash = (line[len - 2] == '\\');
    303 		}
    304 		fclose(fp);
    305 	}
    306 
    307 	if (nelem == 0) {
    308 		/* no records found; pass default size hint */
    309 		nelem = 1;
    310 	} else if (!powerof2(nelem)) {
    311 		/* set nelem to nearest bigger power-of-two number */
    312 		int bt = 1;
    313 		while(bt < nelem) bt <<= 1;
    314 		nelem = bt;
    315 	}
    316 
    317 	return nelem;
    318 }
    319