Utility to maintain shared library lookup "hints".
Does business in `/var/run/ld.so.hints'.
This commit is contained in:
pk
parent
5587236c81
commit
bfca4dbe69
12
gnu/usr.bin/ld/ldconfig/Makefile
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12
gnu/usr.bin/ld/ldconfig/Makefile
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# $Id: Makefile,v 1.1 1993/10/23 00:16:57 pk Exp $
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PROG= ldconfig
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SRCS= ldconfig.c shlib.c etc.c
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LDDIR?= $(.CURDIR)/..
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CFLAGS += -I$(LDDIR) -I$(.CURDIR) -I$(LDDIR)/$(MACHINE) -O
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BINDIR= ${DESTDIR}/sbin
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MAN8 = ldconfig.0
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.PATH: $(LDDIR) $(LDDIR)/$(MACHINE)
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.include <bsd.prog.mk>
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98
gnu/usr.bin/ld/ldconfig/ldconfig.8
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98
gnu/usr.bin/ld/ldconfig/ldconfig.8
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.Dd October 3, 1993
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.Dt LDCONFIG 8
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.Os NetBSD 0.9
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.Sh NAME
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.Nm ldconfig
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.Nd configure the shared library cache
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.Sh SYNOPSIS
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.Nm ldconfig
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.Op Fl rsv
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.Op Ar directory Ar ...
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.Sh DESCRIPTION
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.Nm
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is used to prepare a set of
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.Dq hints
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for use by the run-time linker
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.Xr ld.so
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to facilitate quick lookup of shared libraries available in multiple
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directories. It scans a set of built-in system directories and any
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.Ar directories
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specified on the command line (in the given order) looking for shared
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libraries and stores the results in the file
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.Xr /var/run/ld.so.hints
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to forstall the overhead that would otherwise result from the
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directory search operations
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.Xr ld.so
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would have to perform to load the required shared libraries.
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.Pp
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The shared libraries so found will be automatically available for loading
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if needed by the program being prepared for execution. This obviates the need
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for storing search paths within the executable.
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.Pp
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The
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.Ev LD_LIBRARY_PATH
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environment variable can be used to override the use of
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directories (or the order thereof) from the cache or to specify additional
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directories where shared libraries might be found.
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.Ev LD_LIBRARY_PATH
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is a
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.Sq \:
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separated list of directory paths which are searched by
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.Xr ld.so
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when it needs to load a shared library. It can be viewed as the run-time
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equivalent of the
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.Fl L
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switch of
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.Xr ld.
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.Pp
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.Nm Ldconfig
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is typically run as part of the boot sequence.
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.Pp
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The following options recognized by
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.Nm ldconfig:
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.Bl -tag -width indent
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.It Fl r
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Lists the current contents of
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.Xr ld.so.hints
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on the standard output. The hints file will not be modified.
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.It Fl s
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Do not scan
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.Nm ldconfig
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's builtin system directories
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.Sq /usr/lib
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and
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.Sq /usr/local/lib
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for shared libraries.
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.It Fl v
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Switch on verbose mode.
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.Sh Security
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Special care must be taken when loading shared libraries into the address
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space of
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.Ev set-user-Id
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programs. Whenever such a program is run,
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.Xr ld.so
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will only load shared libraries from the
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.Ev ld.so.hints
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file. In particular, the
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.Ev LD_LIBRARY_PATH
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is not used to search for libraries. Thus, the role of ldconfig is dual. In
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addition to building a set of hints for quick lookup, it also serves to
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specify the trusted collection of directories from which shared objects can
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be safely loaded. It is presumed that the set of directories specified to
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.Nm ldconfig
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are under control of the system's administrator.
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.Xr ld.so
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further assists set-user-Id programs by erasing the
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.Ev LD_LIBRARY_PATH
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from the environment.
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.Sh FILES
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.Xr /var/run/ld.so.hints
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.Sh SEE ALSO
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.Xr ld 1 ,
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.Xr link 5
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.Sh HISTORY
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A
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.Nm
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utility first appeared in SunOS 4.0, it appeared in its current form
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in NetBSD 0.9a.
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411
gnu/usr.bin/ld/ldconfig/ldconfig.c
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411
gnu/usr.bin/ld/ldconfig/ldconfig.c
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/*
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* Copyright (c) 1993 Paul Kranenburg
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: ldconfig.c,v 1.1 1993/10/23 00:17:03 pk Exp $
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*/
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#include <sys/param.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ar.h>
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#include <ranlib.h>
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#include <a.out.h>
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#include <stab.h>
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#include <string.h>
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#include <dirent.h>
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#include "ld.h"
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#undef major
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#undef minor
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char *progname;
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static int verbose;
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static int nostd;
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static int justread;
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#define MAXDEWEY 8
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struct shlib_list {
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/* Internal list of shared libraries found */
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char *name;
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char *path;
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int dewey[MAXDEWEY];
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int ndewey;
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#define major dewey[0]
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#define minor dewey[1]
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struct shlib_list *next;
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};
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static struct shlib_list *shlib_head = NULL, **shlib_tail = &shlib_head;
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static void enter __P((char *, char *, char *, int *, int));
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static int dodir __P((char *));
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static int build_hints __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int i, c;
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int rval = 0;
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extern int optind;
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if ((progname = strrchr(argv[0], '/')) == NULL)
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progname = argv[0];
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else
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progname++;
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while ((c = getopt(argc, argv, "rsv")) != EOF) {
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switch (c) {
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case 'v':
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verbose = 1;
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break;
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case 's':
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nostd = 1;
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break;
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case 'r':
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justread = 1;
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break;
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default:
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fprintf(stderr, "Usage: %s [-v] [dir ...]\n", progname);
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exit(1);
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break;
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}
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}
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if (justread)
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return listhints();
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if (!nostd)
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std_search_dirs(NULL);
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for (i = 0; i < n_search_dirs; i++)
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rval |= dodir(search_dirs[i]);
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for (i = optind; i < argc; i++)
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rval |= dodir(argv[i]);
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rval |= build_hints();
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return rval;
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}
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int
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dodir(dir)
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char *dir;
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{
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DIR *dd;
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struct dirent *dp;
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char name[MAXPATHLEN], rest[MAXPATHLEN];
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int dewey[MAXDEWEY], ndewey;
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if ((dd = opendir(dir)) == NULL) {
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perror(dir);
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return -1;
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}
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while ((dp = readdir(dd)) != NULL) {
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int n;
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name[0] = rest[0] = '\0';
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n = sscanf(dp->d_name, "lib%[^.].so.%s",
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name, rest);
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if (n < 2 || rest[0] == '\0')
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continue;
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ndewey = getdewey(dewey, rest);
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enter(dir, dp->d_name, name, dewey, ndewey);
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}
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return 0;
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}
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static void
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enter(dir, file, name, dewey, ndewey)
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char *dir, *file, *name;
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int dewey[], ndewey;
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{
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struct shlib_list *shp;
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for (shp = shlib_head; shp; shp = shp->next) {
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if (strcmp(name, shp->name) != 0 || major != shp->major)
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continue;
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/* Name matches existing entry */
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if (cmpndewey(dewey, ndewey, shp->dewey, shp->ndewey) > 0) {
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/* Update this entry with higher versioned lib */
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if (verbose)
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printf("Updating lib%s.%d.%d to %s/%s\n",
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shp->name, shp->major, shp->minor,
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dir, file);
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free(shp->name);
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shp->name = strdup(name);
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free(shp->path);
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shp->path = concat(dir, "/", file);
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bcopy(dewey, shp->dewey, sizeof(shp->dewey));
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shp->ndewey = ndewey;
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}
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break;
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}
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if (shp)
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/* Name exists: older version or just updated */
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return;
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/* Allocate new list element */
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if (verbose)
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printf("Adding %s/%s\n", dir, file);
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shp = (struct shlib_list *)xmalloc(sizeof *shp);
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shp->name = strdup(name);
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shp->path = concat(dir, "/", file);
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bcopy(dewey, shp->dewey, MAXDEWEY);
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shp->ndewey = ndewey;
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shp->next = NULL;
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*shlib_tail = shp;
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shlib_tail = &shp->next;
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}
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#if DEBUG
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/* test */
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#undef _PATH_LD_HINTS
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#define _PATH_LD_HINTS "./ld.so.hints"
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#endif
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int
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hinthash(cp, vmajor, vminor)
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char *cp;
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int vmajor, vminor;
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{
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int k = 0;
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while (*cp)
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k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
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k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
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k = (((k << 1) + (k >> 14)) ^ (vminor*167)) & 0x3fff;
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return k;
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}
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int
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build_hints()
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{
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struct hints_header hdr;
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struct hints_bucket *blist;
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struct shlib_list *shp;
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char *strtab;
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int i, n, str_index = 0;
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int strtab_sz = 0; /* Total length of strings */
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int nhints = 0; /* Total number of hints */
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int fd;
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char *tmpfile;
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for (shp = shlib_head; shp; shp = shp->next) {
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strtab_sz += 1 + strlen(shp->name);
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strtab_sz += 1 + strlen(shp->path);
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nhints++;
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}
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/* Fill hints file header */
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hdr.hh_magic = HH_MAGIC;
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hdr.hh_version = LD_HINTS_VERSION_1;
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hdr.hh_nbucket = 1 * nhints;
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n = hdr.hh_nbucket * sizeof(struct hints_bucket);
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hdr.hh_hashtab = sizeof(struct hints_header);
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hdr.hh_strtab = hdr.hh_hashtab + n;
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hdr.hh_strtab_sz = strtab_sz;
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hdr.hh_ehints = hdr.hh_strtab + hdr.hh_strtab_sz;
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if (verbose)
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printf("Totals: entries %d, buckets %d, string size %d\n",
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nhints, hdr.hh_nbucket, strtab_sz);
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/* Allocate buckets and string table */
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blist = (struct hints_bucket *)xmalloc(n);
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bzero((char *)blist, n);
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for (i = 0; i < hdr.hh_nbucket; i++)
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/* Empty all buckets */
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blist[i].hi_next = -1;
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strtab = (char *)xmalloc(strtab_sz);
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/* Enter all */
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for (shp = shlib_head; shp; shp = shp->next) {
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struct hints_bucket *bp;
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bp = blist +
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(hinthash(shp->name, shp->major, shp->minor) % hdr.hh_nbucket);
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if (bp->hi_pathx) {
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int i;
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||||||
|
for (i = 0; i < hdr.hh_nbucket; i++) {
|
||||||
|
if (blist[i].hi_pathx == 0)
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (i == hdr.hh_nbucket) {
|
||||||
|
fprintf(stderr, "Bummer!\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
while (bp->hi_next != -1)
|
||||||
|
bp = &blist[bp->hi_next];
|
||||||
|
bp->hi_next = i;
|
||||||
|
bp = blist + i;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Insert strings in string table */
|
||||||
|
bp->hi_namex = str_index;
|
||||||
|
strcpy(strtab + str_index, shp->name);
|
||||||
|
str_index += 1 + strlen(shp->name);
|
||||||
|
|
||||||
|
bp->hi_pathx = str_index;
|
||||||
|
strcpy(strtab + str_index, shp->path);
|
||||||
|
str_index += 1 + strlen(shp->path);
|
||||||
|
|
||||||
|
/* Copy versions */
|
||||||
|
bcopy(shp->dewey, bp->hi_dewey, sizeof(bp->hi_dewey));
|
||||||
|
bp->hi_ndewey = shp->ndewey;
|
||||||
|
}
|
||||||
|
|
||||||
|
tmpfile = concat(_PATH_LD_HINTS, "+", "");
|
||||||
|
if ((fd = open(tmpfile, O_RDWR|O_CREAT|O_TRUNC, 0444)) == -1) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
mywrite(&hdr, 1, sizeof(struct hints_header), fd);
|
||||||
|
mywrite(blist, hdr.hh_nbucket, sizeof(struct hints_bucket), fd);
|
||||||
|
mywrite(strtab, strtab_sz, 1, fd);
|
||||||
|
|
||||||
|
if (close(fd) != 0) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Now, install real file */
|
||||||
|
if (unlink(_PATH_LD_HINTS) != 0 && errno != ENOENT) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (rename(tmpfile, _PATH_LD_HINTS) != 0) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
listhints()
|
||||||
|
{
|
||||||
|
int fd;
|
||||||
|
caddr_t addr;
|
||||||
|
long msize;
|
||||||
|
struct hints_header *hdr;
|
||||||
|
struct hints_bucket *blist;
|
||||||
|
char *strtab;
|
||||||
|
int i;
|
||||||
|
|
||||||
|
if ((fd = open(_PATH_LD_HINTS, O_RDONLY, 0)) == -1) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
msize = PAGSIZ;
|
||||||
|
addr = mmap(0, msize, PROT_READ, MAP_FILE|MAP_COPY, fd, 0);
|
||||||
|
|
||||||
|
if (addr == (caddr_t)-1) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
hdr = (struct hints_header *)addr;
|
||||||
|
if (HH_BADMAG(*hdr)) {
|
||||||
|
fprintf(stderr, "%s: Bad magic: %d\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (hdr->hh_version != LD_HINTS_VERSION_1) {
|
||||||
|
fprintf(stderr, "Unsupported version: %d\n", hdr->hh_version);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (hdr->hh_ehints > msize) {
|
||||||
|
if (mmap(addr+msize, hdr->hh_ehints - msize,
|
||||||
|
PROT_READ, MAP_FILE|MAP_COPY|MAP_FIXED,
|
||||||
|
fd, msize) != (caddr_t)(addr+msize)) {
|
||||||
|
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
close(fd);
|
||||||
|
|
||||||
|
blist = (struct hints_bucket *)(addr + hdr->hh_hashtab);
|
||||||
|
strtab = (char *)(addr + hdr->hh_strtab);
|
||||||
|
|
||||||
|
printf("%s:\n", _PATH_LD_HINTS);
|
||||||
|
for (i = 0; i < hdr->hh_nbucket; i++) {
|
||||||
|
struct hints_bucket *bp = &blist[i];
|
||||||
|
|
||||||
|
/* Sanity check */
|
||||||
|
if (bp->hi_namex >= hdr->hh_strtab_sz) {
|
||||||
|
fprintf(stderr, "Bad name index: %#x\n", bp->hi_namex);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
if (bp->hi_pathx >= hdr->hh_strtab_sz) {
|
||||||
|
fprintf(stderr, "Bad path index: %#x\n", bp->hi_pathx);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
printf("\t-l%s.%d.%d => %s\n",
|
||||||
|
strtab + bp->hi_namex, bp->hi_major, bp->hi_minor,
|
||||||
|
strtab + bp->hi_pathx);
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
12
sbin/ldconfig/Makefile
Normal file
12
sbin/ldconfig/Makefile
Normal file
@ -0,0 +1,12 @@
|
|||||||
|
# $Id: Makefile,v 1.1 1993/10/23 00:16:57 pk Exp $
|
||||||
|
|
||||||
|
PROG= ldconfig
|
||||||
|
SRCS= ldconfig.c shlib.c etc.c
|
||||||
|
LDDIR?= $(.CURDIR)/..
|
||||||
|
CFLAGS += -I$(LDDIR) -I$(.CURDIR) -I$(LDDIR)/$(MACHINE) -O
|
||||||
|
BINDIR= ${DESTDIR}/sbin
|
||||||
|
MAN8 = ldconfig.0
|
||||||
|
|
||||||
|
.PATH: $(LDDIR) $(LDDIR)/$(MACHINE)
|
||||||
|
|
||||||
|
.include <bsd.prog.mk>
|
||||||
98
sbin/ldconfig/ldconfig.8
Normal file
98
sbin/ldconfig/ldconfig.8
Normal file
@ -0,0 +1,98 @@
|
|||||||
|
.Dd October 3, 1993
|
||||||
|
.Dt LDCONFIG 8
|
||||||
|
.Os NetBSD 0.9
|
||||||
|
.Sh NAME
|
||||||
|
.Nm ldconfig
|
||||||
|
.Nd configure the shared library cache
|
||||||
|
.Sh SYNOPSIS
|
||||||
|
.Nm ldconfig
|
||||||
|
.Op Fl rsv
|
||||||
|
.Op Ar directory Ar ...
|
||||||
|
.Sh DESCRIPTION
|
||||||
|
.Nm
|
||||||
|
is used to prepare a set of
|
||||||
|
.Dq hints
|
||||||
|
for use by the run-time linker
|
||||||
|
.Xr ld.so
|
||||||
|
to facilitate quick lookup of shared libraries available in multiple
|
||||||
|
directories. It scans a set of built-in system directories and any
|
||||||
|
.Ar directories
|
||||||
|
specified on the command line (in the given order) looking for shared
|
||||||
|
libraries and stores the results in the file
|
||||||
|
.Xr /var/run/ld.so.hints
|
||||||
|
to forstall the overhead that would otherwise result from the
|
||||||
|
directory search operations
|
||||||
|
.Xr ld.so
|
||||||
|
would have to perform to load the required shared libraries.
|
||||||
|
.Pp
|
||||||
|
The shared libraries so found will be automatically available for loading
|
||||||
|
if needed by the program being prepared for execution. This obviates the need
|
||||||
|
for storing search paths within the executable.
|
||||||
|
.Pp
|
||||||
|
The
|
||||||
|
.Ev LD_LIBRARY_PATH
|
||||||
|
environment variable can be used to override the use of
|
||||||
|
directories (or the order thereof) from the cache or to specify additional
|
||||||
|
directories where shared libraries might be found.
|
||||||
|
.Ev LD_LIBRARY_PATH
|
||||||
|
is a
|
||||||
|
.Sq \:
|
||||||
|
separated list of directory paths which are searched by
|
||||||
|
.Xr ld.so
|
||||||
|
when it needs to load a shared library. It can be viewed as the run-time
|
||||||
|
equivalent of the
|
||||||
|
.Fl L
|
||||||
|
switch of
|
||||||
|
.Xr ld.
|
||||||
|
.Pp
|
||||||
|
.Nm Ldconfig
|
||||||
|
is typically run as part of the boot sequence.
|
||||||
|
.Pp
|
||||||
|
The following options recognized by
|
||||||
|
.Nm ldconfig:
|
||||||
|
.Bl -tag -width indent
|
||||||
|
.It Fl r
|
||||||
|
Lists the current contents of
|
||||||
|
.Xr ld.so.hints
|
||||||
|
on the standard output. The hints file will not be modified.
|
||||||
|
.It Fl s
|
||||||
|
Do not scan
|
||||||
|
.Nm ldconfig
|
||||||
|
's builtin system directories
|
||||||
|
.Sq /usr/lib
|
||||||
|
and
|
||||||
|
.Sq /usr/local/lib
|
||||||
|
for shared libraries.
|
||||||
|
.It Fl v
|
||||||
|
Switch on verbose mode.
|
||||||
|
.Sh Security
|
||||||
|
Special care must be taken when loading shared libraries into the address
|
||||||
|
space of
|
||||||
|
.Ev set-user-Id
|
||||||
|
programs. Whenever such a program is run,
|
||||||
|
.Xr ld.so
|
||||||
|
will only load shared libraries from the
|
||||||
|
.Ev ld.so.hints
|
||||||
|
file. In particular, the
|
||||||
|
.Ev LD_LIBRARY_PATH
|
||||||
|
is not used to search for libraries. Thus, the role of ldconfig is dual. In
|
||||||
|
addition to building a set of hints for quick lookup, it also serves to
|
||||||
|
specify the trusted collection of directories from which shared objects can
|
||||||
|
be safely loaded. It is presumed that the set of directories specified to
|
||||||
|
.Nm ldconfig
|
||||||
|
are under control of the system's administrator.
|
||||||
|
.Xr ld.so
|
||||||
|
further assists set-user-Id programs by erasing the
|
||||||
|
.Ev LD_LIBRARY_PATH
|
||||||
|
from the environment.
|
||||||
|
|
||||||
|
.Sh FILES
|
||||||
|
.Xr /var/run/ld.so.hints
|
||||||
|
.Sh SEE ALSO
|
||||||
|
.Xr ld 1 ,
|
||||||
|
.Xr link 5
|
||||||
|
.Sh HISTORY
|
||||||
|
A
|
||||||
|
.Nm
|
||||||
|
utility first appeared in SunOS 4.0, it appeared in its current form
|
||||||
|
in NetBSD 0.9a.
|
||||||
411
sbin/ldconfig/ldconfig.c
Normal file
411
sbin/ldconfig/ldconfig.c
Normal file
@ -0,0 +1,411 @@
|
|||||||
|
/*
|
||||||
|
* Copyright (c) 1993 Paul Kranenburg
|
||||||
|
* 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. All advertising materials mentioning features or use of this software
|
||||||
|
* must display the following acknowledgement:
|
||||||
|
* This product includes software developed by Paul Kranenburg.
|
||||||
|
* 4. The name of the author may not be used to endorse or promote products
|
||||||
|
* derived from this software withough specific prior written permission
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
||||||
|
*
|
||||||
|
* $Id: ldconfig.c,v 1.1 1993/10/23 00:17:03 pk Exp $
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <sys/param.h>
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <sys/stat.h>
|
||||||
|
#include <sys/file.h>
|
||||||
|
#include <sys/time.h>
|
||||||
|
#include <sys/mman.h>
|
||||||
|
#include <sys/resource.h>
|
||||||
|
#include <fcntl.h>
|
||||||
|
#include <errno.h>
|
||||||
|
#include <ar.h>
|
||||||
|
#include <ranlib.h>
|
||||||
|
#include <a.out.h>
|
||||||
|
#include <stab.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <dirent.h>
|
||||||
|
|
||||||
|
#include "ld.h"
|
||||||
|
|
||||||
|
#undef major
|
||||||
|
#undef minor
|
||||||
|
|
||||||
|
char *progname;
|
||||||
|
static int verbose;
|
||||||
|
static int nostd;
|
||||||
|
static int justread;
|
||||||
|
|
||||||
|
#define MAXDEWEY 8
|
||||||
|
struct shlib_list {
|
||||||
|
/* Internal list of shared libraries found */
|
||||||
|
char *name;
|
||||||
|
char *path;
|
||||||
|
int dewey[MAXDEWEY];
|
||||||
|
int ndewey;
|
||||||
|
#define major dewey[0]
|
||||||
|
#define minor dewey[1]
|
||||||
|
struct shlib_list *next;
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct shlib_list *shlib_head = NULL, **shlib_tail = &shlib_head;
|
||||||
|
|
||||||
|
static void enter __P((char *, char *, char *, int *, int));
|
||||||
|
static int dodir __P((char *));
|
||||||
|
static int build_hints __P((void));
|
||||||
|
|
||||||
|
int
|
||||||
|
main(argc, argv)
|
||||||
|
int argc;
|
||||||
|
char *argv[];
|
||||||
|
{
|
||||||
|
int i, c;
|
||||||
|
int rval = 0;
|
||||||
|
extern int optind;
|
||||||
|
|
||||||
|
if ((progname = strrchr(argv[0], '/')) == NULL)
|
||||||
|
progname = argv[0];
|
||||||
|
else
|
||||||
|
progname++;
|
||||||
|
|
||||||
|
while ((c = getopt(argc, argv, "rsv")) != EOF) {
|
||||||
|
switch (c) {
|
||||||
|
case 'v':
|
||||||
|
verbose = 1;
|
||||||
|
break;
|
||||||
|
case 's':
|
||||||
|
nostd = 1;
|
||||||
|
break;
|
||||||
|
case 'r':
|
||||||
|
justread = 1;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
fprintf(stderr, "Usage: %s [-v] [dir ...]\n", progname);
|
||||||
|
exit(1);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (justread)
|
||||||
|
return listhints();
|
||||||
|
|
||||||
|
if (!nostd)
|
||||||
|
std_search_dirs(NULL);
|
||||||
|
|
||||||
|
for (i = 0; i < n_search_dirs; i++)
|
||||||
|
rval |= dodir(search_dirs[i]);
|
||||||
|
|
||||||
|
for (i = optind; i < argc; i++)
|
||||||
|
rval |= dodir(argv[i]);
|
||||||
|
|
||||||
|
rval |= build_hints();
|
||||||
|
|
||||||
|
return rval;
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
dodir(dir)
|
||||||
|
char *dir;
|
||||||
|
{
|
||||||
|
DIR *dd;
|
||||||
|
struct dirent *dp;
|
||||||
|
char name[MAXPATHLEN], rest[MAXPATHLEN];
|
||||||
|
int dewey[MAXDEWEY], ndewey;
|
||||||
|
|
||||||
|
if ((dd = opendir(dir)) == NULL) {
|
||||||
|
perror(dir);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
while ((dp = readdir(dd)) != NULL) {
|
||||||
|
int n;
|
||||||
|
|
||||||
|
name[0] = rest[0] = '\0';
|
||||||
|
|
||||||
|
n = sscanf(dp->d_name, "lib%[^.].so.%s",
|
||||||
|
name, rest);
|
||||||
|
|
||||||
|
if (n < 2 || rest[0] == '\0')
|
||||||
|
continue;
|
||||||
|
|
||||||
|
ndewey = getdewey(dewey, rest);
|
||||||
|
enter(dir, dp->d_name, name, dewey, ndewey);
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
enter(dir, file, name, dewey, ndewey)
|
||||||
|
char *dir, *file, *name;
|
||||||
|
int dewey[], ndewey;
|
||||||
|
{
|
||||||
|
struct shlib_list *shp;
|
||||||
|
|
||||||
|
for (shp = shlib_head; shp; shp = shp->next) {
|
||||||
|
if (strcmp(name, shp->name) != 0 || major != shp->major)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
/* Name matches existing entry */
|
||||||
|
if (cmpndewey(dewey, ndewey, shp->dewey, shp->ndewey) > 0) {
|
||||||
|
|
||||||
|
/* Update this entry with higher versioned lib */
|
||||||
|
if (verbose)
|
||||||
|
printf("Updating lib%s.%d.%d to %s/%s\n",
|
||||||
|
shp->name, shp->major, shp->minor,
|
||||||
|
dir, file);
|
||||||
|
|
||||||
|
free(shp->name);
|
||||||
|
shp->name = strdup(name);
|
||||||
|
free(shp->path);
|
||||||
|
shp->path = concat(dir, "/", file);
|
||||||
|
bcopy(dewey, shp->dewey, sizeof(shp->dewey));
|
||||||
|
shp->ndewey = ndewey;
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (shp)
|
||||||
|
/* Name exists: older version or just updated */
|
||||||
|
return;
|
||||||
|
|
||||||
|
/* Allocate new list element */
|
||||||
|
if (verbose)
|
||||||
|
printf("Adding %s/%s\n", dir, file);
|
||||||
|
|
||||||
|
shp = (struct shlib_list *)xmalloc(sizeof *shp);
|
||||||
|
shp->name = strdup(name);
|
||||||
|
shp->path = concat(dir, "/", file);
|
||||||
|
bcopy(dewey, shp->dewey, MAXDEWEY);
|
||||||
|
shp->ndewey = ndewey;
|
||||||
|
shp->next = NULL;
|
||||||
|
|
||||||
|
*shlib_tail = shp;
|
||||||
|
shlib_tail = &shp->next;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
#if DEBUG
|
||||||
|
/* test */
|
||||||
|
#undef _PATH_LD_HINTS
|
||||||
|
#define _PATH_LD_HINTS "./ld.so.hints"
|
||||||
|
#endif
|
||||||
|
|
||||||
|
int
|
||||||
|
hinthash(cp, vmajor, vminor)
|
||||||
|
char *cp;
|
||||||
|
int vmajor, vminor;
|
||||||
|
{
|
||||||
|
int k = 0;
|
||||||
|
|
||||||
|
while (*cp)
|
||||||
|
k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
|
||||||
|
|
||||||
|
k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
|
||||||
|
k = (((k << 1) + (k >> 14)) ^ (vminor*167)) & 0x3fff;
|
||||||
|
|
||||||
|
return k;
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
build_hints()
|
||||||
|
{
|
||||||
|
struct hints_header hdr;
|
||||||
|
struct hints_bucket *blist;
|
||||||
|
struct shlib_list *shp;
|
||||||
|
char *strtab;
|
||||||
|
int i, n, str_index = 0;
|
||||||
|
int strtab_sz = 0; /* Total length of strings */
|
||||||
|
int nhints = 0; /* Total number of hints */
|
||||||
|
int fd;
|
||||||
|
char *tmpfile;
|
||||||
|
|
||||||
|
for (shp = shlib_head; shp; shp = shp->next) {
|
||||||
|
strtab_sz += 1 + strlen(shp->name);
|
||||||
|
strtab_sz += 1 + strlen(shp->path);
|
||||||
|
nhints++;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Fill hints file header */
|
||||||
|
hdr.hh_magic = HH_MAGIC;
|
||||||
|
hdr.hh_version = LD_HINTS_VERSION_1;
|
||||||
|
hdr.hh_nbucket = 1 * nhints;
|
||||||
|
n = hdr.hh_nbucket * sizeof(struct hints_bucket);
|
||||||
|
hdr.hh_hashtab = sizeof(struct hints_header);
|
||||||
|
hdr.hh_strtab = hdr.hh_hashtab + n;
|
||||||
|
hdr.hh_strtab_sz = strtab_sz;
|
||||||
|
hdr.hh_ehints = hdr.hh_strtab + hdr.hh_strtab_sz;
|
||||||
|
|
||||||
|
if (verbose)
|
||||||
|
printf("Totals: entries %d, buckets %d, string size %d\n",
|
||||||
|
nhints, hdr.hh_nbucket, strtab_sz);
|
||||||
|
|
||||||
|
/* Allocate buckets and string table */
|
||||||
|
blist = (struct hints_bucket *)xmalloc(n);
|
||||||
|
bzero((char *)blist, n);
|
||||||
|
for (i = 0; i < hdr.hh_nbucket; i++)
|
||||||
|
/* Empty all buckets */
|
||||||
|
blist[i].hi_next = -1;
|
||||||
|
|
||||||
|
strtab = (char *)xmalloc(strtab_sz);
|
||||||
|
|
||||||
|
/* Enter all */
|
||||||
|
for (shp = shlib_head; shp; shp = shp->next) {
|
||||||
|
struct hints_bucket *bp;
|
||||||
|
|
||||||
|
bp = blist +
|
||||||
|
(hinthash(shp->name, shp->major, shp->minor) % hdr.hh_nbucket);
|
||||||
|
|
||||||
|
if (bp->hi_pathx) {
|
||||||
|
int i;
|
||||||
|
|
||||||
|
for (i = 0; i < hdr.hh_nbucket; i++) {
|
||||||
|
if (blist[i].hi_pathx == 0)
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (i == hdr.hh_nbucket) {
|
||||||
|
fprintf(stderr, "Bummer!\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
while (bp->hi_next != -1)
|
||||||
|
bp = &blist[bp->hi_next];
|
||||||
|
bp->hi_next = i;
|
||||||
|
bp = blist + i;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Insert strings in string table */
|
||||||
|
bp->hi_namex = str_index;
|
||||||
|
strcpy(strtab + str_index, shp->name);
|
||||||
|
str_index += 1 + strlen(shp->name);
|
||||||
|
|
||||||
|
bp->hi_pathx = str_index;
|
||||||
|
strcpy(strtab + str_index, shp->path);
|
||||||
|
str_index += 1 + strlen(shp->path);
|
||||||
|
|
||||||
|
/* Copy versions */
|
||||||
|
bcopy(shp->dewey, bp->hi_dewey, sizeof(bp->hi_dewey));
|
||||||
|
bp->hi_ndewey = shp->ndewey;
|
||||||
|
}
|
||||||
|
|
||||||
|
tmpfile = concat(_PATH_LD_HINTS, "+", "");
|
||||||
|
if ((fd = open(tmpfile, O_RDWR|O_CREAT|O_TRUNC, 0444)) == -1) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
mywrite(&hdr, 1, sizeof(struct hints_header), fd);
|
||||||
|
mywrite(blist, hdr.hh_nbucket, sizeof(struct hints_bucket), fd);
|
||||||
|
mywrite(strtab, strtab_sz, 1, fd);
|
||||||
|
|
||||||
|
if (close(fd) != 0) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Now, install real file */
|
||||||
|
if (unlink(_PATH_LD_HINTS) != 0 && errno != ENOENT) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (rename(tmpfile, _PATH_LD_HINTS) != 0) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
listhints()
|
||||||
|
{
|
||||||
|
int fd;
|
||||||
|
caddr_t addr;
|
||||||
|
long msize;
|
||||||
|
struct hints_header *hdr;
|
||||||
|
struct hints_bucket *blist;
|
||||||
|
char *strtab;
|
||||||
|
int i;
|
||||||
|
|
||||||
|
if ((fd = open(_PATH_LD_HINTS, O_RDONLY, 0)) == -1) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
msize = PAGSIZ;
|
||||||
|
addr = mmap(0, msize, PROT_READ, MAP_FILE|MAP_COPY, fd, 0);
|
||||||
|
|
||||||
|
if (addr == (caddr_t)-1) {
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
hdr = (struct hints_header *)addr;
|
||||||
|
if (HH_BADMAG(*hdr)) {
|
||||||
|
fprintf(stderr, "%s: Bad magic: %d\n");
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (hdr->hh_version != LD_HINTS_VERSION_1) {
|
||||||
|
fprintf(stderr, "Unsupported version: %d\n", hdr->hh_version);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (hdr->hh_ehints > msize) {
|
||||||
|
if (mmap(addr+msize, hdr->hh_ehints - msize,
|
||||||
|
PROT_READ, MAP_FILE|MAP_COPY|MAP_FIXED,
|
||||||
|
fd, msize) != (caddr_t)(addr+msize)) {
|
||||||
|
|
||||||
|
perror(_PATH_LD_HINTS);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
close(fd);
|
||||||
|
|
||||||
|
blist = (struct hints_bucket *)(addr + hdr->hh_hashtab);
|
||||||
|
strtab = (char *)(addr + hdr->hh_strtab);
|
||||||
|
|
||||||
|
printf("%s:\n", _PATH_LD_HINTS);
|
||||||
|
for (i = 0; i < hdr->hh_nbucket; i++) {
|
||||||
|
struct hints_bucket *bp = &blist[i];
|
||||||
|
|
||||||
|
/* Sanity check */
|
||||||
|
if (bp->hi_namex >= hdr->hh_strtab_sz) {
|
||||||
|
fprintf(stderr, "Bad name index: %#x\n", bp->hi_namex);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
if (bp->hi_pathx >= hdr->hh_strtab_sz) {
|
||||||
|
fprintf(stderr, "Bad path index: %#x\n", bp->hi_pathx);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
printf("\t-l%s.%d.%d => %s\n",
|
||||||
|
strtab + bp->hi_namex, bp->hi_major, bp->hi_minor,
|
||||||
|
strtab + bp->hi_pathx);
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
Loading…
Reference in New Issue
Block a user