/*      $NetBSD: ldd_elfxx.c,v 1.9 2026/07/01 19:29:58 riastradh 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 <matt@3am-software.com>
 * 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 1.9 2026/07/01 19:29:58 riastradh 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, NULL);

        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);
                }
        }
}