327 lines
7.9 KiB
C
327 lines
7.9 KiB
C
/* $NetBSD: cap_mkdb.c,v 1.30 2021/12/03 13:27:39 andvar Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if !defined(lint)
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__COPYRIGHT("@(#) Copyright (c) 1992, 1993\
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The Regents of the University of California. All rights reserved.");
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#if 0
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static char sccsid[] = "@(#)cap_mkdb.c 8.2 (Berkeley) 4/27/95";
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#endif
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__RCSID("$NetBSD: cap_mkdb.c,v 1.30 2021/12/03 13:27:39 andvar Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <db.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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static void db_build(const char **);
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static void dounlink(void);
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static void usage(void) __dead;
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static int count_records(char **);
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static DB *capdbp;
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static int verbose;
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static char *capname, outfile[MAXPATHLEN];
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static HASHINFO openinfo = {
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4096, /* bsize */
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16, /* ffactor */
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2048, /* nelem */
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2048 * 1024, /* cachesize */
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NULL, /* hash() */
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0 /* lorder */
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};
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/*
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* Mkcapdb creates a capability hash database for quick retrieval of capability
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* records. The database contains 2 types of entries: records and references
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* marked by the first byte in the data. A record entry contains the actual
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* capability record whereas a reference contains the name (key) under which
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* the correct record is stored.
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*/
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int
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main(int argc, char *argv[])
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{
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int c, byteorder;
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char *p;
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capname = NULL;
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byteorder = 0;
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while ((c = getopt(argc, argv, "bf:lv")) != -1) {
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switch(c) {
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case 'b':
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case 'l':
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if (byteorder != 0)
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usage();
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byteorder = c == 'b' ? 4321 : 1234;
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break;
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case 'f':
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capname = optarg;
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break;
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case 'v':
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verbose = 1;
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (*argv == NULL)
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usage();
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/* Set byte order */
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openinfo.lorder = byteorder;
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/*
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* Set nelem to twice the value returned by count_record().
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*/
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openinfo.nelem = count_records(argv) << 1;
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/*
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* The database file is the first argument if no name is specified.
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* Make arrangements to unlink it if exit badly.
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*/
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(void)snprintf(outfile, sizeof(outfile), "%s.db.tmp",
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capname ? capname : *argv);
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if ((capname = strdup(outfile)) == NULL)
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err(1, "strdup");
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p = strrchr(outfile, '.');
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assert(p != NULL);
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*p = '\0';
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(void)unlink(outfile);
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if ((capdbp = dbopen(capname, O_CREAT | O_TRUNC | O_RDWR,
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DEFFILEMODE, DB_HASH, &openinfo)) == NULL)
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err(1, "%s", outfile);
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if (atexit(dounlink))
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err(1, "atexit");
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db_build((void *)argv);
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if (capdbp->close(capdbp) < 0)
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err(1, "%s", capname);
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if (rename(capname, outfile) == -1)
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err(1, "rename");
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free(capname);
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capname = NULL;
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return 0;
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}
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static void
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dounlink(void)
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{
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if (capname != NULL)
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unlink(capname);
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}
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/*
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* Any changes to these definitions should be made also in the getcap(3)
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* library routines.
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*/
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#define RECOK (char)0
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#define TCERR (char)1
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#define SHADOW (char)2
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/*
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* Db_build() builds the name and capability databases according to the
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* details above.
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*/
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static void
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db_build(const char **ifiles)
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{
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DBT key, data;
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recno_t reccnt;
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size_t len, bplen;
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int st;
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char *bp, *p, *t, *n;
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data.data = NULL;
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key.data = NULL;
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for (reccnt = 0, bplen = 0; (st = cgetnext(&bp, ifiles)) > 0; free(bp)){
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/*
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* Allocate enough memory to store record, terminating
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* NULL and one extra byte.
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*/
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len = strlen(bp);
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if (bplen <= len + 2) {
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if ((n = realloc(data.data,
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bplen + MAX(256, len + 2))) == NULL)
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err(1, "realloc");
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data.data = n;
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bplen += MAX(256, len + 2);
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}
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/* Find the end of the name field. */
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if ((p = strchr(bp, ':')) == NULL) {
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warnx("no name field: %.*s", (int)(MIN(len, 20)), bp);
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continue;
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}
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/* First byte of stored record indicates status. */
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switch(st) {
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case 1:
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((char *)(data.data))[0] = RECOK;
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break;
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case 2:
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((char *)(data.data))[0] = TCERR;
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warnx("Record not tc expanded: %.*s", (int)(p - bp),bp);
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break;
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}
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/* Create the stored record. */
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(void)memmove(&((u_char *)(data.data))[1], bp, len + 1);
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data.size = len + 2;
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/* Store the record under the name field. */
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key.data = bp;
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key.size = p - bp;
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switch(capdbp->put(capdbp, &key, &data, R_NOOVERWRITE)) {
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case -1:
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err(1, "put");
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/* NOTREACHED */
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case 1:
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warnx("ignored duplicate: %.*s",
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(int)key.size, (char *)key.data);
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continue;
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}
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++reccnt;
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/* If only one name, ignore the rest. */
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if ((p = strchr(bp, '|')) == NULL)
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continue;
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/* The rest of the names reference the entire name. */
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((char *)(data.data))[0] = SHADOW;
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(void)memmove(&((u_char *)(data.data))[1], key.data, key.size);
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data.size = key.size + 1;
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/* Store references for other names. */
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for (p = t = bp;; ++p) {
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if (p > t && (*p == ':' || *p == '|')) {
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key.size = p - t;
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key.data = t;
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switch(capdbp->put(capdbp,
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&key, &data, R_NOOVERWRITE)) {
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case -1:
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err(1, "put");
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/* NOTREACHED */
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case 1:
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warnx("ignored duplicate: %.*s",
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(int)key.size, (char *)key.data);
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}
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t = p + 1;
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}
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if (*p == ':')
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break;
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}
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}
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switch(st) {
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case -1:
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err(1, "file argument");
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/* NOTREACHED */
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case -2:
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errx(1, "potential reference loop detected");
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/* NOTREACHED */
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}
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if (verbose)
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(void)printf("cap_mkdb: %d capability records\n", reccnt);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"Usage: %s [-b|-l] [-v] [-f outfile] file1 [file2 ...]\n",
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getprogname());
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exit(1);
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}
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/*
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* Count number of records in input files. This does not need
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* to be really accurate (the result is used only as a hint).
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* It seems to match number of records should a cgetnext() be used, though.
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*/
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static int
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count_records(char **list)
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{
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FILE *fp;
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char *line;
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size_t len;
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int nelem, slash;
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/* scan input files and count individual records */
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for(nelem = 0, slash = 0; *list && (fp = fopen(*list++, "r")); ) {
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while((line = fgetln(fp, &len)) != NULL) {
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if (len < 2)
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continue;
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if (!isspace((unsigned char) *line) && *line != ':'
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&& *line != '#' && !slash)
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nelem++;
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slash = (line[len - 2] == '\\');
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}
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(void)fclose(fp);
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}
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if (nelem == 0) {
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/* no records found; pass default size hint */
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nelem = 1;
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} else if (!powerof2(nelem)) {
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/* set nelem to nearest bigger power-of-two number */
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int bt = 1;
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while(bt < nelem) bt <<= 1;
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nelem = bt;
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}
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return nelem;
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}
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