OpenBSD-4.6/gnu/usr.bin/ld/shlib.c
/* $OpenBSD: shlib.c,v 1.15 2003/04/16 02:15:10 deraadt Exp $ */
/* $NetBSD: shlib.c,v 1.13 1998/04/04 01:00:29 fvdl Exp $ */
/*
* 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 without 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.
*
*/
#ifdef sun
char *strsep();
int isdigit();
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <ranlib.h>
#include <a.out.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ld.h"
/*
* Standard directories to search for files specified by -l.
*/
#ifndef STANDARD_SEARCH_DIRS
#define STANDARD_SEARCH_DIRS "/usr/lib"
#endif
/*
* Actual vector of library search directories,
* including `-L'ed and LD_LIBRARY_PATH spec'd ones.
*/
char **search_dirs;
int n_search_dirs;
char *standard_search_dirs[] = {
STANDARD_SEARCH_DIRS
};
void
add_search_dir(char *name)
{
int i, len;
len = strlen(name);
while (len > 1 && name[len - 1] == '/')
--len;
for (i = 0; i < n_search_dirs; i++)
if (strlen(search_dirs[i]) == len &&
!strncmp(search_dirs[i], name, len))
return;
n_search_dirs++;
search_dirs = (char **)
xrealloc(search_dirs, n_search_dirs * sizeof search_dirs[0]);
search_dirs[n_search_dirs - 1] = xmalloc(++len);
(void)strlcpy(search_dirs[n_search_dirs - 1], name, len);
}
void
remove_search_dir(char *name)
{
int i, len;
len = strlen(name);
while (len > 1 && name[len - 1] == '/')
--len;
for (i = 0; i < n_search_dirs; i++) {
if (strlen(search_dirs[i]) != len ||
strncmp(search_dirs[i], name, len))
continue;
free(search_dirs[i]);
if (i < (n_search_dirs - 1))
bcopy(&search_dirs[i+1], &search_dirs[i],
(n_search_dirs - i - 1) * sizeof search_dirs[0]);
n_search_dirs--;
search_dirs = (char **)xrealloc(search_dirs,
n_search_dirs * sizeof search_dirs[0]);
break;
}
}
void
add_search_path(char *path)
{
char *cp, *dup;
if (path == NULL)
return;
/* Add search directories from `path' */
path = dup = strdup(path);
while ((cp = strsep(&path, ":")) != NULL)
add_search_dir(cp);
free(dup);
}
void
remove_search_path(char *path)
{
char *cp, *dup;
if (path == NULL)
return;
/* Remove search directories from `path' */
path = dup = strdup(path);
while ((cp = strsep(&path, ":")) != NULL)
remove_search_dir(cp);
free(dup);
}
void
std_search_path(void)
{
int i, n;
/* Append standard search directories */
n = sizeof standard_search_dirs / sizeof standard_search_dirs[0];
for (i = 0; i < n; i++)
add_search_dir(standard_search_dirs[i]);
}
/*
* Return true if CP points to a valid dewey number.
* Decode and leave the result in the array DEWEY.
* Return the number of decoded entries in DEWEY.
*/
int
getdewey(int dewey[], char *cp)
{
int i, n;
for (n = 0, i = 0; i < MAXDEWEY; i++) {
if (*cp == '\0')
break;
if (*cp == '.') cp++;
#ifdef SUNOS_LIB_COMPAT
if (!(isdigit)(*cp))
#else
if (!isdigit(*cp))
#endif
return 0;
dewey[n++] = strtol(cp, &cp, 10);
}
return n;
}
/*
* Compare two dewey arrays.
* Return -1 if `d1' represents a smaller value than `d2'.
* Return 1 if `d1' represents a greater value than `d2'.
* Return 0 if equal.
*/
int
cmpndewey(int d1[], int n1, int d2[], int n2)
{
int i;
for (i = 0; i < n1 && i < n2; i++) {
if (d1[i] < d2[i])
return -1;
if (d1[i] > d2[i])
return 1;
}
if (n1 == n2)
return 0;
if (i == n1)
return -1;
if (i == n2)
return 1;
errx(1, "cmpndewey: cant happen");
return 0;
}
/*
* Search directories for a shared library matching the given
* major and minor version numbers.
*
* MAJOR == -1 && MINOR == -1 --> find highest version
* MAJOR != -1 && MINOR == -1 --> find highest minor version
* MAJOR == -1 && MINOR != -1 --> invalid
* MAJOR != -1 && MINOR != -1 --> find highest micro version
*/
/* Not interested in devices right now... */
#undef major
#undef minor
char *
findshlib(char *name, int *majorp, int *minorp, int do_dot_a)
{
int dewey[MAXDEWEY];
int ndewey;
int tmp[MAXDEWEY];
int i;
int len;
char *lname;
int major = *majorp, minor = *minorp;
len = strlen(name);
lname = (char *)alloca(len + sizeof("lib"));
snprintf(lname, len + sizeof("lib"), "lib%s", name);
len += 3;
ndewey = 0;
for (i = 0; i < n_search_dirs; i++) {
DIR *dd = opendir(search_dirs[i]);
struct dirent *dp;
char *path = NULL;
if (dd == NULL)
continue;
while ((dp = readdir(dd)) != NULL) {
int n;
if (do_dot_a && path == NULL &&
dp->d_namlen == len + 2 &&
strncmp(dp->d_name, lname, len) == 0 &&
(dp->d_name+len)[0] == '.' &&
(dp->d_name+len)[1] == 'a') {
path = concat(search_dirs[i], "/", dp->d_name);
}
if (dp->d_namlen < len + 4)
continue;
if (strncmp(dp->d_name, lname, len) != 0)
continue;
if (strncmp(dp->d_name+len, ".so.", 4) != 0)
continue;
if ((n = getdewey(tmp, dp->d_name+len+4)) == 0)
continue;
/* skip inappropriate versions. */
if (major != -1) {
if (tmp[0] != major)
continue;
if (n != 1 && minor != -1 && tmp[1] < minor)
continue;
}
if (cmpndewey(tmp, n, dewey, ndewey) <= 0)
continue;
/* We have a better version */
if (path)
free(path);
path = concat(search_dirs[i], "/", dp->d_name);
bcopy(tmp, dewey, sizeof(dewey));
ndewey = n;
*majorp = dewey[0];
*minorp = dewey[1];
}
closedir(dd);
if (path != NULL)
/*
* There's a lib in this dir; take it.
*/
return path;
}
return NULL;
}