357 lines
8.2 KiB
C
357 lines
8.2 KiB
C
/*
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* Copyright (c) 1993 Paul Kranenburg
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/wait.h>
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#include <machine/elf.h>
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#include <arpa/inet.h>
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#include <a.out.h>
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#include <dlfcn.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "extern.h"
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/*
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* 32-bit ELF data structures can only be used if the system header[s] declare
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* them. There is no official macro for determining whether they are declared,
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* so check for the existence of one of the 32-macros defined in elf(5).
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*/
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#ifdef ELF32_R_TYPE
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#define ELF32_SUPPORTED
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#endif
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static int is_executable(const char *fname, int fd, int *is_shlib,
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int *type);
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static void usage(void);
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#define TYPE_UNKNOWN 0
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#define TYPE_AOUT 1
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#define TYPE_ELF 2 /* Architecture default */
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#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
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#define TYPE_ELF32 3 /* Explicit 32 bits on architectures >32 bits */
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#endif
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#define ENV_OBJECTS 0
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#define ENV_OBJECTS_FMT1 1
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#define ENV_OBJECTS_FMT2 2
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#define ENV_OBJECTS_PROGNAME 3
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#define ENV_OBJECTS_ALL 4
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#define ENV_LAST 5
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const char *envdef[ENV_LAST] = {
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"LD_TRACE_LOADED_OBJECTS",
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"LD_TRACE_LOADED_OBJECTS_FMT1",
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"LD_TRACE_LOADED_OBJECTS_FMT2",
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"LD_TRACE_LOADED_OBJECTS_PROGNAME",
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"LD_TRACE_LOADED_OBJECTS_ALL",
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};
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#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
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const char *env32[ENV_LAST] = {
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"LD_32_TRACE_LOADED_OBJECTS",
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"LD_32_TRACE_LOADED_OBJECTS_FMT1",
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"LD_32_TRACE_LOADED_OBJECTS_FMT2",
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"LD_32_TRACE_LOADED_OBJECTS_PROGNAME",
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"LD_32_TRACE_LOADED_OBJECTS_ALL",
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};
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#endif
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int
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main(int argc, char *argv[])
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{
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char *fmt1, *fmt2;
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int rval, c, aflag, vflag;
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aflag = vflag = 0;
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fmt1 = fmt2 = NULL;
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while ((c = getopt(argc, argv, "af:v")) != -1) {
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switch (c) {
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case 'a':
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aflag++;
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break;
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case 'f':
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if (fmt1 != NULL) {
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if (fmt2 != NULL)
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errx(1, "too many formats");
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fmt2 = optarg;
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} else
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fmt1 = optarg;
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break;
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case 'v':
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vflag++;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if (vflag && fmt1 != NULL)
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errx(1, "-v may not be used with -f");
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if (argc <= 0) {
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usage();
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/* NOTREACHED */
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}
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#ifdef __i386__
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if (vflag) {
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for (c = 0; c < argc; c++)
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dump_file(argv[c]);
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exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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#endif
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rval = 0;
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for (; argc > 0; argc--, argv++) {
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int fd, status, is_shlib, rv, type;
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const char **env;
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if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
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warn("%s", *argv);
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rval |= 1;
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continue;
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}
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rv = is_executable(*argv, fd, &is_shlib, &type);
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close(fd);
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if (rv == 0) {
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rval |= 1;
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continue;
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}
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switch (type) {
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case TYPE_ELF:
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case TYPE_AOUT:
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env = envdef;
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break;
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#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
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case TYPE_ELF32:
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env = env32;
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break;
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#endif
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case TYPE_UNKNOWN:
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default:
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/*
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* This shouldn't happen unless is_executable()
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* is broken.
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*/
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errx(EDOOFUS, "unknown executable type");
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}
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/* ld.so magic */
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setenv(env[ENV_OBJECTS], "yes", 1);
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if (fmt1 != NULL)
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setenv(env[ENV_OBJECTS_FMT1], fmt1, 1);
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if (fmt2 != NULL)
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setenv(env[ENV_OBJECTS_FMT2], fmt2, 1);
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setenv(env[ENV_OBJECTS_PROGNAME], *argv, 1);
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if (aflag)
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setenv(env[ENV_OBJECTS_ALL], "1", 1);
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else if (fmt1 == NULL && fmt2 == NULL)
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/* Default formats */
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printf("%s:\n", *argv);
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fflush(stdout);
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switch (fork()) {
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case -1:
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err(1, "fork");
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break;
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default:
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if (wait(&status) <= 0) {
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warn("wait");
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rval |= 1;
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} else if (WIFSIGNALED(status)) {
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fprintf(stderr, "%s: signal %d\n", *argv,
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WTERMSIG(status));
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rval |= 1;
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} else if (WIFEXITED(status) && WEXITSTATUS(status)) {
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fprintf(stderr, "%s: exit status %d\n", *argv,
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WEXITSTATUS(status));
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rval |= 1;
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}
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break;
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case 0:
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if (is_shlib == 0) {
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execl(*argv, *argv, (char *)NULL);
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warn("%s", *argv);
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} else {
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dlopen(*argv, RTLD_TRACE);
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warnx("%s: %s", *argv, dlerror());
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}
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_exit(1);
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}
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}
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return rval;
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: ldd [-a] [-v] [-f format] program ...\n");
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exit(1);
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}
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static int
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is_executable(const char *fname, int fd, int *is_shlib, int *type)
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{
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union {
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struct exec aout;
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#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
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Elf32_Ehdr elf32;
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#endif
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Elf_Ehdr elf;
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} hdr;
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int n;
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*is_shlib = 0;
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*type = TYPE_UNKNOWN;
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if ((n = read(fd, &hdr, sizeof(hdr))) == -1) {
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warn("%s: can't read program header", fname);
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return (0);
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}
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if ((size_t)n >= sizeof(hdr.aout) && !N_BADMAG(hdr.aout)) {
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/* a.out file */
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if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC
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#if 1 /* Compatibility */
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|| hdr.aout.a_entry < __LDPGSZ
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#endif
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) {
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warnx("%s: not a dynamic executable", fname);
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return (0);
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}
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*type = TYPE_AOUT;
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return (1);
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}
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#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
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if ((size_t)n >= sizeof(hdr.elf32) && IS_ELF(hdr.elf32) &&
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hdr.elf32.e_ident[EI_CLASS] == ELFCLASS32) {
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/* Handle 32 bit ELF objects */
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Elf32_Phdr phdr;
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int dynamic, i;
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dynamic = 0;
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*type = TYPE_ELF32;
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if (lseek(fd, hdr.elf32.e_phoff, SEEK_SET) == -1) {
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warnx("%s: header too short", fname);
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return (0);
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}
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for (i = 0; i < hdr.elf32.e_phnum; i++) {
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if (read(fd, &phdr, hdr.elf32.e_phentsize) !=
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sizeof(phdr)) {
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warnx("%s: can't read program header", fname);
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return (0);
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}
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if (phdr.p_type == PT_DYNAMIC) {
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dynamic = 1;
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break;
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}
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}
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if (!dynamic) {
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warnx("%s: not a dynamic ELF executable", fname);
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return (0);
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}
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if (hdr.elf32.e_type == ET_DYN) {
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if (hdr.elf32.e_ident[EI_OSABI] & ELFOSABI_FREEBSD) {
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*is_shlib = 1;
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return (1);
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}
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warnx("%s: not a FreeBSD ELF shared object", fname);
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return (0);
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}
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return (1);
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}
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#endif
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if ((size_t)n >= sizeof(hdr.elf) && IS_ELF(hdr.elf) &&
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hdr.elf.e_ident[EI_CLASS] == ELF_TARG_CLASS) {
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/* Handle default ELF objects on this architecture */
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Elf_Phdr phdr;
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int dynamic, i;
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dynamic = 0;
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*type = TYPE_ELF;
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if (lseek(fd, hdr.elf.e_phoff, SEEK_SET) == -1) {
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warnx("%s: header too short", fname);
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return (0);
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}
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for (i = 0; i < hdr.elf.e_phnum; i++) {
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if (read(fd, &phdr, hdr.elf.e_phentsize)
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!= sizeof(phdr)) {
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warnx("%s: can't read program header", fname);
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return (0);
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}
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if (phdr.p_type == PT_DYNAMIC) {
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dynamic = 1;
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break;
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}
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}
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if (!dynamic) {
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warnx("%s: not a dynamic ELF executable", fname);
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return (0);
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}
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if (hdr.elf.e_type == ET_DYN) {
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if (hdr.elf.e_ident[EI_OSABI] & ELFOSABI_FREEBSD) {
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*is_shlib = 1;
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return (1);
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}
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warnx("%s: not a FreeBSD ELF shared object", fname);
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return (0);
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}
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return (1);
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}
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warnx("%s: not a dynamic executable", fname);
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return (0);
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}
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