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-rw-r--r--usr.bin/ldd/ldd.c389
1 files changed, 389 insertions, 0 deletions
diff --git a/usr.bin/ldd/ldd.c b/usr.bin/ldd/ldd.c
new file mode 100644
index 0000000..00c8797
--- /dev/null
+++ b/usr.bin/ldd/ldd.c
@@ -0,0 +1,389 @@
+/*
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/wait.h>
+
+#include <machine/elf.h>
+
+#include <arpa/inet.h>
+
+#include <a.out.h>
+#include <dlfcn.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "extern.h"
+
+#ifdef COMPAT_32BIT
+#define LD_ "LD_32_"
+#else
+#define LD_ "LD_"
+#endif
+
+/*
+ * 32-bit ELF data structures can only be used if the system header[s] declare
+ * them. There is no official macro for determining whether they are declared,
+ * so check for the existence of one of the 32-macros defined in elf(5).
+ */
+#ifdef ELF32_R_TYPE
+#define ELF32_SUPPORTED
+#endif
+
+static int is_executable(const char *fname, int fd, int *is_shlib,
+ int *type);
+static void usage(void);
+
+#define TYPE_UNKNOWN 0
+#define TYPE_AOUT 1
+#define TYPE_ELF 2 /* Architecture default */
+#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
+#define TYPE_ELF32 3 /* Explicit 32 bits on architectures >32 bits */
+
+#define _PATH_LDD32 "/usr/bin/ldd32"
+
+static int
+execldd32(char *file, char *fmt1, char *fmt2, int aflag, int vflag)
+{
+ char *argv[8];
+ int i, rval, status;
+
+ unsetenv(LD_ "TRACE_LOADED_OBJECTS");
+ rval = 0;
+ i = 0;
+ argv[i++] = strdup(_PATH_LDD32);
+ if (aflag)
+ argv[i++] = strdup("-a");
+ if (vflag)
+ argv[i++] = strdup("-v");
+ if (fmt1 != NULL) {
+ argv[i++] = strdup("-f");
+ argv[i++] = strdup(fmt1);
+ }
+ if (fmt2 != NULL) {
+ argv[i++] = strdup("-f");
+ argv[i++] = strdup(fmt2);
+ }
+ argv[i++] = strdup(file);
+ argv[i++] = NULL;
+
+ switch (fork()) {
+ case -1:
+ err(1, "fork");
+ break;
+ case 0:
+ execv(_PATH_LDD32, argv);
+ warn("%s", _PATH_LDD32);
+ _exit(127);
+ break;
+ default:
+ if (wait(&status) < 0)
+ rval = 1;
+ else if (WIFSIGNALED(status))
+ rval = 1;
+ else if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
+ rval = 1;
+ break;
+ }
+ while (i--)
+ free(argv[i]);
+ setenv(LD_ "TRACE_LOADED_OBJECTS", "yes", 1);
+ return (rval);
+}
+#endif
+
+int
+main(int argc, char *argv[])
+{
+ char *fmt1, *fmt2;
+ int rval, c, aflag, vflag;
+
+ aflag = vflag = 0;
+ fmt1 = fmt2 = NULL;
+
+ while ((c = getopt(argc, argv, "af:v")) != -1) {
+ switch (c) {
+ case 'a':
+ aflag++;
+ break;
+ case 'f':
+ if (fmt1 != NULL) {
+ if (fmt2 != NULL)
+ errx(1, "too many formats");
+ fmt2 = optarg;
+ } else
+ fmt1 = optarg;
+ break;
+ case 'v':
+ vflag++;
+ break;
+ default:
+ usage();
+ /* NOTREACHED */
+ }
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (vflag && fmt1 != NULL)
+ errx(1, "-v may not be used with -f");
+
+ if (argc <= 0) {
+ usage();
+ /* NOTREACHED */
+ }
+
+#ifdef __i386__
+ if (vflag) {
+ for (c = 0; c < argc; c++)
+ dump_file(argv[c]);
+ exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
+ }
+#endif
+
+ rval = 0;
+ for (; argc > 0; argc--, argv++) {
+ int fd, status, is_shlib, rv, type;
+
+ if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
+ warn("%s", *argv);
+ rval |= 1;
+ continue;
+ }
+ rv = is_executable(*argv, fd, &is_shlib, &type);
+ close(fd);
+ if (rv == 0) {
+ rval |= 1;
+ continue;
+ }
+
+ switch (type) {
+ case TYPE_ELF:
+ case TYPE_AOUT:
+ break;
+#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
+ case TYPE_ELF32:
+ rval |= execldd32(*argv, fmt1, fmt2, aflag, vflag);
+ continue;
+#endif
+ case TYPE_UNKNOWN:
+ default:
+ /*
+ * This shouldn't happen unless is_executable()
+ * is broken.
+ */
+ errx(EDOOFUS, "unknown executable type");
+ }
+
+ /* ld.so magic */
+ setenv(LD_ "TRACE_LOADED_OBJECTS", "yes", 1);
+ if (fmt1 != NULL)
+ setenv(LD_ "TRACE_LOADED_OBJECTS_FMT1", fmt1, 1);
+ if (fmt2 != NULL)
+ setenv(LD_ "TRACE_LOADED_OBJECTS_FMT2", fmt2, 1);
+
+ setenv(LD_ "TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1);
+ if (aflag)
+ setenv(LD_ "TRACE_LOADED_OBJECTS_ALL", "1", 1);
+ else if (fmt1 == NULL && fmt2 == NULL)
+ /* Default formats */
+ printf("%s:\n", *argv);
+ fflush(stdout);
+
+ switch (fork()) {
+ case -1:
+ err(1, "fork");
+ break;
+ default:
+ if (wait(&status) < 0) {
+ warn("wait");
+ rval |= 1;
+ } else if (WIFSIGNALED(status)) {
+ fprintf(stderr, "%s: signal %d\n", *argv,
+ WTERMSIG(status));
+ rval |= 1;
+ } else if (WIFEXITED(status) &&
+ WEXITSTATUS(status) != 0) {
+ fprintf(stderr, "%s: exit status %d\n", *argv,
+ WEXITSTATUS(status));
+ rval |= 1;
+ }
+ break;
+ case 0:
+ if (is_shlib == 0) {
+ execl(*argv, *argv, (char *)NULL);
+ warn("%s", *argv);
+ } else {
+ dlopen(*argv, RTLD_TRACE);
+ warnx("%s: %s", *argv, dlerror());
+ }
+ _exit(1);
+ }
+ }
+
+ return rval;
+}
+
+static void
+usage(void)
+{
+
+ fprintf(stderr, "usage: ldd [-a] [-v] [-f format] program ...\n");
+ exit(1);
+}
+
+static int
+is_executable(const char *fname, int fd, int *is_shlib, int *type)
+{
+ union {
+ struct exec aout;
+#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
+ Elf32_Ehdr elf32;
+#endif
+ Elf_Ehdr elf;
+ } hdr;
+ int n;
+
+ *is_shlib = 0;
+ *type = TYPE_UNKNOWN;
+
+ if ((n = read(fd, &hdr, sizeof(hdr))) == -1) {
+ warn("%s: can't read program header", fname);
+ return (0);
+ }
+
+ if ((size_t)n >= sizeof(hdr.aout) && !N_BADMAG(hdr.aout)) {
+ /* a.out file */
+ if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC
+#if 1 /* Compatibility */
+ || hdr.aout.a_entry < __LDPGSZ
+#endif
+ ) {
+ warnx("%s: not a dynamic executable", fname);
+ return (0);
+ }
+ *type = TYPE_AOUT;
+ return (1);
+ }
+
+#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
+ if ((size_t)n >= sizeof(hdr.elf32) && IS_ELF(hdr.elf32) &&
+ hdr.elf32.e_ident[EI_CLASS] == ELFCLASS32) {
+ /* Handle 32 bit ELF objects */
+ Elf32_Phdr phdr;
+ int dynamic, i;
+
+ dynamic = 0;
+ *type = TYPE_ELF32;
+
+ if (lseek(fd, hdr.elf32.e_phoff, SEEK_SET) == -1) {
+ warnx("%s: header too short", fname);
+ return (0);
+ }
+ for (i = 0; i < hdr.elf32.e_phnum; i++) {
+ if (read(fd, &phdr, hdr.elf32.e_phentsize) !=
+ sizeof(phdr)) {
+ warnx("%s: can't read program header", fname);
+ return (0);
+ }
+ if (phdr.p_type == PT_DYNAMIC) {
+ dynamic = 1;
+ break;
+ }
+ }
+
+ if (!dynamic) {
+ warnx("%s: not a dynamic ELF executable", fname);
+ return (0);
+ }
+ if (hdr.elf32.e_type == ET_DYN) {
+ if (hdr.elf32.e_ident[EI_OSABI] == ELFOSABI_FREEBSD) {
+ *is_shlib = 1;
+ return (1);
+ }
+ warnx("%s: not a FreeBSD ELF shared object", fname);
+ return (0);
+ }
+
+ return (1);
+ }
+#endif
+
+ if ((size_t)n >= sizeof(hdr.elf) && IS_ELF(hdr.elf) &&
+ hdr.elf.e_ident[EI_CLASS] == ELF_TARG_CLASS) {
+ /* Handle default ELF objects on this architecture */
+ Elf_Phdr phdr;
+ int dynamic, i;
+
+ dynamic = 0;
+ *type = TYPE_ELF;
+
+ if (lseek(fd, hdr.elf.e_phoff, SEEK_SET) == -1) {
+ warnx("%s: header too short", fname);
+ return (0);
+ }
+ for (i = 0; i < hdr.elf.e_phnum; i++) {
+ if (read(fd, &phdr, hdr.elf.e_phentsize)
+ != sizeof(phdr)) {
+ warnx("%s: can't read program header", fname);
+ return (0);
+ }
+ if (phdr.p_type == PT_DYNAMIC) {
+ dynamic = 1;
+ break;
+ }
+ }
+
+ if (!dynamic) {
+ warnx("%s: not a dynamic ELF executable", fname);
+ return (0);
+ }
+ if (hdr.elf.e_type == ET_DYN) {
+ if (hdr.elf.e_ident[EI_OSABI] == ELFOSABI_FREEBSD) {
+ *is_shlib = 1;
+ return (1);
+ }
+ warnx("%s: not a FreeBSD ELF shared object", fname);
+ return (0);
+ }
+
+ return (1);
+ }
+
+ warnx("%s: not a dynamic executable", fname);
+ return (0);
+}
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