OpenBSD-4.6/usr.bin/cap_mkdb/cap_mkdb.c
/* $OpenBSD: cap_mkdb.c,v 1.14 2006/03/04 20:32:51 otto Exp $ */
/* $NetBSD: cap_mkdb.c,v 1.5 1995/09/02 05:47:12 jtc Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1992, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)cap_mkdb.c 8.2 (Berkeley) 4/27/95";
#endif
static char rcsid[] = "$OpenBSD: cap_mkdb.c,v 1.14 2006/03/04 20:32:51 otto Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
void db_build(char **);
void dounlink(void);
void usage(void);
int igetnext(char **, char **);
int main(int, char *[]);
DB *capdbp;
int info, verbose;
char *capname, buf[8 * 1024];
HASHINFO openinfo = {
4096, /* bsize */
16, /* ffactor */
256, /* nelem */
2048 * 1024, /* cachesize */
NULL, /* hash() */
0 /* lorder */
};
/*
* cap_mkdb creates a capability hash database for quick retrieval of capability
* records. The database contains 2 types of entries: records and references
* marked by the first byte in the data. A record entry contains the actual
* capability record whereas a reference contains the name (key) under which
* the correct record is stored.
*/
int
main(int argc, char *argv[])
{
int c;
capname = NULL;
while ((c = getopt(argc, argv, "f:iv")) != -1) {
switch(c) {
case 'f':
capname = optarg;
break;
case 'v':
verbose = 1;
break;
case 'i':
info = 1;
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (*argv == NULL)
usage();
/*
* The database file is the first argument if no name is specified.
* Make arrangements to unlink it if we exit badly.
*/
(void)snprintf(buf, sizeof(buf), "%s.db", capname ? capname : *argv);
if ((capname = strdup(buf)) == NULL)
err(1, NULL);
if ((capdbp = dbopen(capname, O_CREAT | O_TRUNC | O_RDWR,
DEFFILEMODE, DB_HASH, &openinfo)) == NULL)
err(1, "%s", buf);
if (atexit(dounlink))
err(1, "atexit");
db_build(argv);
if (capdbp->close(capdbp) < 0)
err(1, "%s", capname);
capname = NULL;
exit(0);
}
void
dounlink(void)
{
if (capname != NULL)
(void)unlink(capname);
}
/*
* Any changes to these definitions should be made also in the getcap(3)
* library routines.
*/
#define RECOK (char)0
#define TCERR (char)1
#define SHADOW (char)2
/*
* db_build() builds the name and capability databases according to the
* details above.
*/
void
db_build(char **ifiles)
{
DBT key, data;
recno_t reccnt;
size_t len, bplen;
int st;
char *bp, *p, *t;
cgetusedb(0); /* disable reading of .db files in getcap(3) */
data.data = NULL;
key.data = NULL;
for (reccnt = 0, bplen = 0;
(st = (info ? igetnext(&bp, ifiles) : cgetnext(&bp, ifiles))) > 0;) {
/*
* Allocate enough memory to store record, terminating
* NULL and one extra byte.
*/
len = strlen(bp);
if (bplen <= len + 2) {
int newbplen = bplen + MAX(256, len + 2);
void *newdata;
if ((newdata = realloc(data.data, newbplen)) == NULL)
err(1, NULL);
data.data = newdata;
bplen = newbplen;
}
/* Find the end of the name field. */
if ((p = strchr(bp, info ? ',' : ':')) == NULL) {
warnx("no name field: %.*s", (int)MIN(len, 20), bp);
continue;
}
/* First byte of stored record indicates status. */
switch(st) {
case 1:
((char *)(data.data))[0] = RECOK;
break;
case 2:
((char *)(data.data))[0] = TCERR;
warnx("Record not tc expanded: %.*s", (int)(p - bp), bp);
break;
}
/* Create the stored record. */
if (info) {
(void) memcpy(&((u_char *)(data.data))[1], bp, len + 1);
data.size = len + 2;
for (t = memchr((char *)data.data + 1, ',', data.size - 1);
t;
t = memchr(t, ',', data.size - (t - (char *)data.data)))
*t++ = ':';
if (memchr((char *)data.data + 1, '\0', data.size - 2)) {
warnx("NUL in entry: %.*s", (int)MIN(len, 20), bp);
continue;
}
} else {
char *capbeg, *capend;
t = (char *)data.data + 1;
/* Copy the cap name and trailing ':' */
len = p - bp + 1;
memcpy(t, bp, len);
t += len;
/* Copy entry, collapsing empty fields. */
capbeg = p + 1;
while (*capbeg) {
/* Skip empty fields. */
if ((len = strspn(capbeg, ": \t\n\r")))
capbeg += len;
/* Find the end of this cap and copy it w/ : */
capend = strchr(capbeg, ':');
if (capend)
len = capend - capbeg + 1;
else
len = strlen(capbeg);
memcpy(t, capbeg, len);
t += len;
capbeg += len;
}
*t = '\0';
data.size = t - (char *)data.data + 1;
}
/* Store the record under the name field. */
key.data = bp;
key.size = p - bp;
switch(capdbp->put(capdbp, &key, &data, R_NOOVERWRITE)) {
case -1:
err(1, "put");
/* NOTREACHED */
case 1:
warnx("ignored duplicate: %.*s",
(int)key.size, (char *)key.data);
continue;
}
++reccnt;
/* If only one name, ignore the rest. */
if ((p = strchr(bp, '|')) == NULL)
continue;
/* The rest of the names reference the entire name. */
((char *)(data.data))[0] = SHADOW;
(void) memmove(&((u_char *)(data.data))[1], key.data, key.size);
data.size = key.size + 1;
/* Store references for other names. */
for (p = t = bp;; ++p) {
if (p > t && (*p == (info ? ',' : ':') || *p == '|')) {
key.size = p - t;
key.data = t;
switch(capdbp->put(capdbp,
&key, &data, R_NOOVERWRITE)) {
case -1:
err(1, "put");
/* NOTREACHED */
case 1:
warnx("ignored duplicate: %.*s",
(int)key.size, (char *)key.data);
}
t = p + 1;
}
if (*p == (info ? ',' : ':'))
break;
}
free(bp);
}
switch(st) {
case -1:
err(1, "file argument");
/* NOTREACHED */
case -2:
errx(1, "potential reference loop detected");
/* NOTREACHED */
}
if (verbose)
(void)printf("cap_mkdb: %d capability records\n", reccnt);
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: cap_mkdb [-iv] [-f outfile] file1 [file2 ...]\n");
exit(1);
}