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/* $OpenBSD: kvm_mkdb.c,v 1.28 2016/04/25 16:03:57 deraadt Exp $ */ |
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/*- |
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* Copyright (c) 1990, 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 <sys/types.h> |
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#include <sys/time.h> |
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#include <sys/resource.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 <libgen.h> |
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#include <paths.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 <grp.h> |
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#include "extern.h" |
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__dead void usage(void); |
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int kvm_mkdb(int, const char *, char *, char *, gid_t, int); |
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HASHINFO openinfo = { |
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4096, /* bsize */ |
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128, /* ffactor */ |
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1024, /* 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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int |
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main(int argc, char *argv[]) |
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{ |
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struct rlimit rl; |
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struct group *gr; |
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gid_t kvm_gid = -1; |
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int fd, rval, ch, verbose = 0; |
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char *nlistpath, *nlistname; |
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char dbdir[PATH_MAX]; |
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if (pledge("stdio rpath wpath cpath fattr getpw flock id", NULL) == -1) |
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err(1, "pledge"); |
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/* Try to use the kmem group to be able to fchown() in kvm_mkdb(). */ |
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if ((gr = getgrnam("kmem")) == NULL) { |
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warn("can't find kmem group"); |
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} else { |
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kvm_gid = gr->gr_gid; |
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if (setresgid(kvm_gid, kvm_gid, kvm_gid) == -1) |
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err(1, "setegid"); |
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} |
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/* Increase our data size to the max if we can. */ |
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if (getrlimit(RLIMIT_DATA, &rl) == 0) { |
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rl.rlim_cur = rl.rlim_max; |
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if (setrlimit(RLIMIT_DATA, &rl) < 0) |
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warn("can't set rlimit data size"); |
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} |
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if (pledge("stdio rpath wpath cpath fattr flock", NULL) == -1) |
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err(1, "pledge"); |
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strlcpy(dbdir, _PATH_VARDB, sizeof(dbdir)); |
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while ((ch = getopt(argc, argv, "vo:")) != -1) |
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switch (ch) { |
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case 'v': |
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verbose = 1; |
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break; |
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case 'o': |
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rval = strlcpy(dbdir, optarg, sizeof(dbdir)); |
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if (rval == 0 || rval + 1 >= sizeof(dbdir)) |
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errx(1, "Invalid directory"); |
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/* Make sure there is a '/' at the end of the path */ |
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if (dbdir[strlen(dbdir) - 1] != '/') |
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strlcat(dbdir, "/", sizeof(dbdir)); |
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break; |
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default: |
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usage(); |
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} |
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argc -= optind; |
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argv += optind; |
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if (argc > 1) |
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usage(); |
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/* If no kernel specified use _PATH_KSYMS and fall back to _PATH_UNIX */ |
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if (argc > 0) { |
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nlistpath = argv[0]; |
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nlistname = basename(nlistpath); |
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if ((fd = open(nlistpath, O_RDONLY, 0)) == -1) |
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err(1, "can't open %s", nlistpath); |
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rval = kvm_mkdb(fd, dbdir, nlistpath, nlistname, kvm_gid, |
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verbose); |
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} else { |
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nlistname = basename(_PATH_UNIX); |
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if ((fd = open((nlistpath = _PATH_KSYMS), O_RDONLY, 0)) == -1 || |
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(rval = kvm_mkdb(fd, dbdir, nlistpath, nlistname, kvm_gid, |
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verbose)) != 0) { |
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if (fd == -1) |
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warnx("can't open %s", _PATH_KSYMS); |
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else |
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warnx("will try again using %s instead", _PATH_UNIX); |
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if ((fd = open((nlistpath = _PATH_UNIX), O_RDONLY, 0)) == -1) |
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err(1, "can't open %s", nlistpath); |
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rval = kvm_mkdb(fd, dbdir, nlistpath, nlistname, |
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kvm_gid, verbose); |
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} |
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} |
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exit(rval); |
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} |
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int |
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kvm_mkdb(int fd, const char *dbdir, char *nlistpath, char *nlistname, gid_t gid, |
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int verbose) |
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{ |
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DB *db; |
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char dbtemp[PATH_MAX], dbname[PATH_MAX]; |
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int r; |
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r = snprintf(dbtemp, sizeof(dbtemp), "%skvm_%s.tmp", |
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dbdir, nlistname); |
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if (r < 0 || r >= sizeof(dbtemp)) { |
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warnx("Directory name too long"); |
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return (1); |
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} |
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r = snprintf(dbname, sizeof(dbname), "%skvm_%s.db", |
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dbdir, nlistname); |
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if (r < 0 || r >= sizeof(dbtemp)) { |
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warnx("Directory name too long"); |
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return (1); |
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} |
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/* If the existing db file matches the currently running kernel, exit */ |
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if (testdb(dbname)) { |
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if (verbose) |
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warnx("%s already up to date", dbname); |
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return(0); |
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} else if (verbose) |
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warnx("rebuilding %s", dbname); |
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(void)umask(0); |
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db = dbopen(dbtemp, O_CREAT | O_EXLOCK | O_TRUNC | O_RDWR, |
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S_IRUSR | S_IWUSR | S_IRGRP, DB_HASH, &openinfo); |
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if (db == NULL) { |
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warn("can't dbopen %s", dbtemp); |
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return(1); |
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} |
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if (gid != -1 && fchown(db->fd(db), -1, gid) == -1) { |
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warn("can't chown %s", dbtemp); |
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(void)unlink(dbtemp); |
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return(1); |
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} |
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if (create_knlist(nlistpath, fd, db) != 0) { |
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warn("cannot determine executable type of %s", nlistpath); |
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(void)unlink(dbtemp); |
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return(1); |
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} |
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if (db->close(db)) { |
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warn("can't dbclose %s", dbtemp); |
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(void)unlink(dbtemp); |
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return(1); |
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} |
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if (rename(dbtemp, dbname)) { |
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warn("rename %s to %s", dbtemp, dbname); |
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(void)unlink(dbtemp); |
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return(1); |
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} |
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return(0); |
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} |
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__dead void |
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usage(void) |
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{ |
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(void)fprintf(stderr, "usage: kvm_mkdb [-v] [-o directory] [file]\n"); |
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exit(1); |
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} |