aboutsummaryrefslogtreecommitdiff
path: root/sbin
diff options
context:
space:
mode:
authorPaul Richards <paul@FreeBSD.org>1993-11-03 23:41:59 +0000
committerPaul Richards <paul@FreeBSD.org>1993-11-03 23:41:59 +0000
commitb9ae52e32a22d27416486dd65ba51ac1052384f4 (patch)
treeae9c655d7f7352058dd703d580c1f70430c1e5f7 /sbin
parent19bcb5e4a2321c910f9903d39de2957643afeadd (diff)
downloadsrc-b9ae52e32a22d27416486dd65ba51ac1052384f4.tar.gz
src-b9ae52e32a22d27416486dd65ba51ac1052384f4.zip
Imported NetBSD's ld for shared libs.
Notes
Notes: svn path=/head/; revision=696
Diffstat (limited to 'sbin')
-rw-r--r--sbin/ldconfig/Makefile13
-rw-r--r--sbin/ldconfig/ldconfig.898
-rw-r--r--sbin/ldconfig/ldconfig.c411
3 files changed, 522 insertions, 0 deletions
diff --git a/sbin/ldconfig/Makefile b/sbin/ldconfig/Makefile
new file mode 100644
index 000000000000..e655e2648df6
--- /dev/null
+++ b/sbin/ldconfig/Makefile
@@ -0,0 +1,13 @@
+# $Id: Makefile,v 1.2 1993/11/03 05:20:49 cgd Exp $
+
+PROG= ldconfig
+SRCS= ldconfig.c shlib.c etc.c
+LDDIR?= $(.CURDIR)/..
+LDFLAGS += -static
+CFLAGS += -I$(LDDIR) -I$(.CURDIR) -I$(LDDIR)/$(MACHINE) -O
+BINDIR= ${DESTDIR}/sbin
+MAN8 = ldconfig.0
+
+.PATH: $(LDDIR) $(LDDIR)/$(MACHINE)
+
+.include <bsd.prog.mk>
diff --git a/sbin/ldconfig/ldconfig.8 b/sbin/ldconfig/ldconfig.8
new file mode 100644
index 000000000000..e363269baab4
--- /dev/null
+++ b/sbin/ldconfig/ldconfig.8
@@ -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.
diff --git a/sbin/ldconfig/ldconfig.c b/sbin/ldconfig/ldconfig.c
new file mode 100644
index 000000000000..b4b9981c81d9
--- /dev/null
+++ b/sbin/ldconfig/ldconfig.c
@@ -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;
+}
+