292 lines
7.1 KiB
C
292 lines
7.1 KiB
C
/* $OpenBSD: cap_mkdb.c,v 1.25 2020/09/15 07:41:38 kevlo Exp $ */
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/* $NetBSD: cap_mkdb.c,v 1.5 1995/09/02 05:47:12 jtc 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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#include <sys/stat.h>
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#include <db.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.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 <ctype.h>
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#include <unistd.h>
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#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
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#define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b))
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void db_build(char **);
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void dounlink(void);
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void usage(void);
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DB *capdbp;
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int verbose;
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char *capname, buf[8 * 1024];
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HASHINFO openinfo = {
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4096, /* bsize */
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16, /* ffactor */
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256, /* 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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* cap_mkdb 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;
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if (pledge("stdio rpath wpath cpath", NULL) == -1)
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err(1, "pledge");
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capname = NULL;
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while ((c = getopt(argc, argv, "f:iv")) != -1) {
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switch(c) {
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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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/*
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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 we exit badly.
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*/
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(void)snprintf(buf, sizeof(buf), "%s.db", capname ? capname : *argv);
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if ((capname = strdup(buf)) == NULL)
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err(1, NULL);
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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", buf);
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if (atexit(dounlink) != 0)
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err(1, "atexit");
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db_build(argv);
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if (capdbp->close(capdbp) < 0)
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err(1, "%s", capname);
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capname = NULL;
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exit(0);
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}
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void
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dounlink(void)
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{
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if (capname != NULL)
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(void)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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void
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db_build(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, *capbeg, *capend;
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cgetusedb(0); /* disable reading of .db files in getcap(3) */
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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;) {
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/*
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* Allocate enough memory to store the size of the record plus
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* a terminating 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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int newbplen = bplen + MAXIMUM(256, len + 2);
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void *newdata;
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if ((newdata = realloc(data.data, newbplen)) == NULL)
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err(1, NULL);
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data.data = newdata;
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bplen = newbplen;
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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)MINIMUM(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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t = (char *)data.data + 1;
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/* Copy the cap name and trailing ':' */
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len = p - bp + 1;
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memcpy(t, bp, len);
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t += len;
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/* Copy entry, collapsing empty fields. */
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capbeg = p + 1;
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while (*capbeg) {
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/* Skip empty fields. */
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if ((len = strspn(capbeg, ": \t\n\r")))
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capbeg += len;
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/* Find the end of this cap and copy it w/ : */
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capend = strchr(capbeg, ':');
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if (capend)
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len = capend - capbeg + 1;
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else
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len = strlen(capbeg);
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memcpy(t, capbeg, len);
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t += len;
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capbeg += len;
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}
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*t = '\0';
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data.size = t - (char *)data.data + 1;
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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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/*
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* If this is the last entry and contains any
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* spaces, it is a description rather than an
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* alias, so skip it and break.
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*/
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if (*p != '|' &&
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memchr(key.data, ' ', key.size) != NULL)
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break;
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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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free(bp);
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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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void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: cap_mkdb [-v] [-f outfile] file1 [file2 ...]\n");
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exit(1);
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}
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