/* $NetBSD: ldd_elfxx.c,v 1.8 2021/07/22 17:39:53 christos Exp $ */
/*-
* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
/*
* Copyright 1996 John D. Polstra.
* Copyright 1996 Matt Thomas <
[email protected]>
* 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 John Polstra.
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: ldd_elfxx.c,v 1.8 2021/07/22 17:39:53 christos Exp $");
#endif /* not lint */
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include "debug.h"
#include "rtld.h"
#include "ldd.h"
static void print_needed(Obj_Entry *, const char *, const char *);
static void fmtprint(const char *, Obj_Entry *, const char *, const char *);
/*
* elfxx_ldd() - bit-size independent ELF ldd implementation.
* returns 0 on success and -1 on failure.
*/
int
ELFNAME(ldd)(int fd, char *prog, char *path, const char *fmt1, const char *fmt2)
{
struct stat st;
if (lseek(fd, 0, SEEK_SET) < 0 ||
fstat(fd, &st) < 0) {
_rtld_error("%s: %s", path, strerror(errno));
return -1;
}
_rtld_pagesz = sysconf(_SC_PAGESIZE);
#ifdef RTLD_ARCH_SUBDIR
_rtld_add_paths(path, &_rtld_default_paths,
RTLD_DEFAULT_LIBRARY_PATH "/" RTLD_ARCH_SUBDIR);
#endif
_rtld_add_paths(path, &_rtld_default_paths, RTLD_DEFAULT_LIBRARY_PATH);
_rtld_paths = NULL;
_rtld_trust = (st.st_mode & (S_ISUID | S_ISGID)) == 0;
if (_rtld_trust)
_rtld_add_paths(path, &_rtld_paths, getenv("LD_LIBRARY_PATH"));
_rtld_process_hints(path, &_rtld_paths, &_rtld_xforms, _PATH_LD_HINTS);
_rtld_objmain = _rtld_map_object(xstrdup(path), fd, &st);
if (_rtld_objmain == NULL)
return -1;
_rtld_objmain->path = xstrdup(path);
_rtld_digest_dynamic(path, _rtld_objmain);
/* Link the main program into the list of objects. */
*_rtld_objtail = _rtld_objmain;
_rtld_objtail = &_rtld_objmain->next;
++_rtld_objmain->refcount;
(void) _rtld_load_needed_objects(_rtld_objmain, 0);
if (fmt1 == NULL)
printf("%s:\n", prog);
main_local = path;
main_progname = _rtld_objmain->path;
print_needed(_rtld_objmain, fmt1, fmt2);
while (_rtld_objlist != NULL) {
Obj_Entry *obj = _rtld_objlist;
_rtld_objlist = obj->next;
while (obj->rpaths != NULL) {
const Search_Path *rpath = obj->rpaths;
obj->rpaths = rpath->sp_next;
xfree(__UNCONST(rpath->sp_path));
xfree(__UNCONST(rpath));
}
while (obj->needed != NULL) {
const Needed_Entry *needed = obj->needed;
obj->needed = needed->next;
xfree(__UNCONST(needed));
}
(void) munmap(obj->mapbase, obj->mapsize);
xfree(obj->path);
xfree(obj);
}
_rtld_objmain = NULL;
_rtld_objtail = &_rtld_objlist;
/* Need to free _rtld_paths? */
return 0;
}
void
fmtprint(const char *libname, Obj_Entry *obj, const char *fmt1,
const char *fmt2)
{
const char *libpath = obj ? obj->path : "not found";
char libnamebuf[200];
char *libmajor = NULL;
const char *fmt;
char *cp;
int c;
if (strncmp(libname, "lib", 3) == 0 &&
(cp = strstr(libname, ".so")) != NULL) {
size_t i = cp - (libname + 3);
if (i >= sizeof(libnamebuf))
i = sizeof(libnamebuf) - 1;
(void)memcpy(libnamebuf, libname + 3, i);
libnamebuf[i] = '\0';
if (cp[3] && isdigit((unsigned char)cp[4]))
libmajor = &cp[4];
libname = libnamebuf;
}
if (fmt1 == NULL)
fmt1 = libmajor != NULL ?
"\t-l%o.%m => %p\n" :
"\t-l%o => %p\n";
if (fmt2 == NULL)
fmt2 = "\t%o => %p\n";
fmt = libname == libnamebuf ? fmt1 : fmt2;
while ((c = *fmt++) != '\0') {
switch (c) {
default:
putchar(c);
continue;
case '\\':
switch (c = *fmt) {
case '\0':
continue;
case 'n':
putchar('\n');
break;
case 't':
putchar('\t');
break;
}
break;
case '%':
switch (c = *fmt) {
case '\0':
continue;
case '%':
default:
putchar(c);
break;
case 'A':
printf("%s", main_local);
break;
case 'a':
printf("%s", main_progname);
break;
case 'o':
printf("%s", libname);
break;
case 'm':
printf("%s", libmajor);
break;
case 'n':
/* XXX: not supported for elf */
break;
case 'p':
printf("%s", libpath);
break;
case 'x':
printf("%p", obj ? obj->mapbase : 0);
break;
}
break;
}
++fmt;
}
}
void
print_needed(Obj_Entry *obj, const char *fmt1, const char *fmt2)
{
const Needed_Entry *needed;
for (needed = obj->needed; needed != NULL; needed = needed->next) {
const char *libname = obj->strtab + needed->name;
if (needed->obj != NULL) {
if (!needed->obj->printed) {
fmtprint(libname, needed->obj, fmt1, fmt2);
needed->obj->printed = 1;
print_needed(needed->obj, fmt1, fmt2);
}
} else {
fmtprint(libname, needed->obj, fmt1, fmt2);
}
}
}
