Imported NetBSD's ld for shared libs.

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;
+}
+