1/*
2 * Copyright (c) 1993 Paul Kranenburg
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Paul Kranenburg.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
| 1/*
2 * Copyright (c) 1993 Paul Kranenburg
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Paul Kranenburg.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
|
33
34#include <sys/wait.h>
35
36#include <machine/elf.h>
37
38#include <arpa/inet.h>
39
40#include <dlfcn.h>
41#include <err.h>
42#include <errno.h>
43#include <fcntl.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48
49#include "extern.h"
50
51/* We don't support a.out executables on arm64 and riscv */
52#if !defined(__aarch64__) && !defined(__riscv__)
53#include <a.out.h>
54#define AOUT_SUPPORTED
55#endif
56
57/*
58 * 32-bit ELF data structures can only be used if the system header[s] declare
59 * them. There is no official macro for determining whether they are declared,
60 * so check for the existence of one of the 32-macros defined in elf(5).
61 */
62#ifdef ELF32_R_TYPE
63#define ELF32_SUPPORTED
64#endif
65
66#define LDD_SETENV(name, value, overwrite) do { \
67 setenv("LD_" name, value, overwrite); \
68 setenv("LD_32_" name, value, overwrite); \
69} while (0)
70
71#define LDD_UNSETENV(name) do { \
72 unsetenv("LD_" name); \
73 unsetenv("LD_32_" name); \
74} while (0)
75
76static int is_executable(const char *fname, int fd, int *is_shlib,
77 int *type);
78static void usage(void);
79
80#define TYPE_UNKNOWN 0
81#define TYPE_AOUT 1
82#define TYPE_ELF 2 /* Architecture default */
83#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
84#define TYPE_ELF32 3 /* Explicit 32 bits on architectures >32 bits */
85
86#define _PATH_LDD32 "/usr/bin/ldd32"
87
88static int
89execldd32(char *file, char *fmt1, char *fmt2, int aflag, int vflag)
90{
| 33
34#include <sys/wait.h>
35
36#include <machine/elf.h>
37
38#include <arpa/inet.h>
39
40#include <dlfcn.h>
41#include <err.h>
42#include <errno.h>
43#include <fcntl.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48
49#include "extern.h"
50
51/* We don't support a.out executables on arm64 and riscv */
52#if !defined(__aarch64__) && !defined(__riscv__)
53#include <a.out.h>
54#define AOUT_SUPPORTED
55#endif
56
57/*
58 * 32-bit ELF data structures can only be used if the system header[s] declare
59 * them. There is no official macro for determining whether they are declared,
60 * so check for the existence of one of the 32-macros defined in elf(5).
61 */
62#ifdef ELF32_R_TYPE
63#define ELF32_SUPPORTED
64#endif
65
66#define LDD_SETENV(name, value, overwrite) do { \
67 setenv("LD_" name, value, overwrite); \
68 setenv("LD_32_" name, value, overwrite); \
69} while (0)
70
71#define LDD_UNSETENV(name) do { \
72 unsetenv("LD_" name); \
73 unsetenv("LD_32_" name); \
74} while (0)
75
76static int is_executable(const char *fname, int fd, int *is_shlib,
77 int *type);
78static void usage(void);
79
80#define TYPE_UNKNOWN 0
81#define TYPE_AOUT 1
82#define TYPE_ELF 2 /* Architecture default */
83#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
84#define TYPE_ELF32 3 /* Explicit 32 bits on architectures >32 bits */
85
86#define _PATH_LDD32 "/usr/bin/ldd32"
87
88static int
89execldd32(char *file, char *fmt1, char *fmt2, int aflag, int vflag)
90{
|
92 int i, rval, status;
93
94 LDD_UNSETENV("TRACE_LOADED_OBJECTS");
95 rval = 0;
96 i = 0;
97 argv[i++] = strdup(_PATH_LDD32);
98 if (aflag)
99 argv[i++] = strdup("-a");
100 if (vflag)
101 argv[i++] = strdup("-v");
102 if (fmt1 != NULL) {
103 argv[i++] = strdup("-f");
104 argv[i++] = strdup(fmt1);
105 }
106 if (fmt2 != NULL) {
107 argv[i++] = strdup("-f");
108 argv[i++] = strdup(fmt2);
109 }
110 argv[i++] = strdup(file);
111 argv[i++] = NULL;
112
113 switch (fork()) {
114 case -1:
115 err(1, "fork");
116 break;
117 case 0:
118 execv(_PATH_LDD32, argv);
119 warn("%s", _PATH_LDD32);
120 _exit(127);
121 break;
122 default:
123 if (wait(&status) < 0)
124 rval = 1;
125 else if (WIFSIGNALED(status))
126 rval = 1;
127 else if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
128 rval = 1;
129 break;
130 }
131 while (i--)
132 free(argv[i]);
133 LDD_SETENV("TRACE_LOADED_OBJECTS", "yes", 1);
134 return (rval);
135}
136#endif
137
138int
139main(int argc, char *argv[])
140{
141 char *fmt1, *fmt2;
142 int rval, c, aflag, vflag;
143
144 aflag = vflag = 0;
145 fmt1 = fmt2 = NULL;
146
147 while ((c = getopt(argc, argv, "af:v")) != -1) {
148 switch (c) {
149 case 'a':
150 aflag++;
151 break;
152 case 'f':
153 if (fmt1 != NULL) {
154 if (fmt2 != NULL)
155 errx(1, "too many formats");
156 fmt2 = optarg;
157 } else
158 fmt1 = optarg;
159 break;
160 case 'v':
161 vflag++;
162 break;
163 default:
164 usage();
165 /* NOTREACHED */
166 }
167 }
168 argc -= optind;
169 argv += optind;
170
171 if (vflag && fmt1 != NULL)
172 errx(1, "-v may not be used with -f");
173
174 if (argc <= 0) {
175 usage();
176 /* NOTREACHED */
177 }
178
179#ifdef __i386__
180 if (vflag) {
181 for (c = 0; c < argc; c++)
182 dump_file(argv[c]);
183 exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
184 }
185#endif
186
187 rval = 0;
188 for (; argc > 0; argc--, argv++) {
189 int fd, status, is_shlib, rv, type;
190
191 if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
192 warn("%s", *argv);
193 rval |= 1;
194 continue;
195 }
196 rv = is_executable(*argv, fd, &is_shlib, &type);
197 close(fd);
198 if (rv == 0) {
199 rval |= 1;
200 continue;
201 }
202
203 switch (type) {
204 case TYPE_ELF:
205 case TYPE_AOUT:
206 break;
207#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
208 case TYPE_ELF32:
209 rval |= execldd32(*argv, fmt1, fmt2, aflag, vflag);
210 continue;
211#endif
212 case TYPE_UNKNOWN:
213 default:
214 /*
215 * This shouldn't happen unless is_executable()
216 * is broken.
217 */
218 errx(EDOOFUS, "unknown executable type");
219 }
220
221 /* ld.so magic */
222 LDD_SETENV("TRACE_LOADED_OBJECTS", "yes", 1);
223 if (fmt1 != NULL)
224 LDD_SETENV("TRACE_LOADED_OBJECTS_FMT1", fmt1, 1);
225 if (fmt2 != NULL)
226 LDD_SETENV("TRACE_LOADED_OBJECTS_FMT2", fmt2, 1);
227
228 LDD_SETENV("TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1);
229 if (aflag)
230 LDD_SETENV("TRACE_LOADED_OBJECTS_ALL", "1", 1);
231 else if (fmt1 == NULL && fmt2 == NULL)
232 /* Default formats */
233 printf("%s:\n", *argv);
234 fflush(stdout);
235
236 switch (fork()) {
237 case -1:
238 err(1, "fork");
239 break;
240 default:
241 if (wait(&status) < 0) {
242 warn("wait");
243 rval |= 1;
244 } else if (WIFSIGNALED(status)) {
245 fprintf(stderr, "%s: signal %d\n", *argv,
246 WTERMSIG(status));
247 rval |= 1;
248 } else if (WIFEXITED(status) &&
249 WEXITSTATUS(status) != 0) {
250 fprintf(stderr, "%s: exit status %d\n", *argv,
251 WEXITSTATUS(status));
252 rval |= 1;
253 }
254 break;
255 case 0:
256 if (is_shlib == 0) {
257 execl(*argv, *argv, (char *)NULL);
258 warn("%s", *argv);
259 } else {
260 dlopen(*argv, RTLD_TRACE);
261 warnx("%s: %s", *argv, dlerror());
262 }
263 _exit(1);
264 }
265 }
266
267 return rval;
268}
269
270static void
271usage(void)
272{
273
274 fprintf(stderr, "usage: ldd [-a] [-v] [-f format] program ...\n");
275 exit(1);
276}
277
278static int
279is_executable(const char *fname, int fd, int *is_shlib, int *type)
280{
281 union {
282#ifdef AOUT_SUPPORTED
283 struct exec aout;
284#endif
285#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
286 Elf32_Ehdr elf32;
287#endif
288 Elf_Ehdr elf;
289 } hdr;
290 int n;
291
292 *is_shlib = 0;
293 *type = TYPE_UNKNOWN;
294
295 if ((n = read(fd, &hdr, sizeof(hdr))) == -1) {
296 warn("%s: can't read program header", fname);
297 return (0);
298 }
299
300#ifdef AOUT_SUPPORTED
301 if ((size_t)n >= sizeof(hdr.aout) && !N_BADMAG(hdr.aout)) {
302 /* a.out file */
303 if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC
304#if 1 /* Compatibility */
305 || hdr.aout.a_entry < __LDPGSZ
306#endif
307 ) {
308 warnx("%s: not a dynamic executable", fname);
309 return (0);
310 }
311 *type = TYPE_AOUT;
312 return (1);
313 }
314#endif
315
316#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
317 if ((size_t)n >= sizeof(hdr.elf32) && IS_ELF(hdr.elf32) &&
318 hdr.elf32.e_ident[EI_CLASS] == ELFCLASS32) {
319 /* Handle 32 bit ELF objects */
320 Elf32_Phdr phdr;
321 int dynamic, i;
322
323 dynamic = 0;
324 *type = TYPE_ELF32;
325
326 if (lseek(fd, hdr.elf32.e_phoff, SEEK_SET) == -1) {
327 warnx("%s: header too short", fname);
328 return (0);
329 }
330 for (i = 0; i < hdr.elf32.e_phnum; i++) {
331 if (read(fd, &phdr, hdr.elf32.e_phentsize) !=
332 sizeof(phdr)) {
333 warnx("%s: can't read program header", fname);
334 return (0);
335 }
336 if (phdr.p_type == PT_DYNAMIC) {
337 dynamic = 1;
338 break;
339 }
340 }
341
342 if (!dynamic) {
343 warnx("%s: not a dynamic ELF executable", fname);
344 return (0);
345 }
346 if (hdr.elf32.e_type == ET_DYN) {
347 if (hdr.elf32.e_ident[EI_OSABI] == ELFOSABI_FREEBSD) {
348 *is_shlib = 1;
349 return (1);
350 }
351 warnx("%s: not a FreeBSD ELF shared object", fname);
352 return (0);
353 }
354
355 return (1);
356 }
357#endif
358
359 if ((size_t)n >= sizeof(hdr.elf) && IS_ELF(hdr.elf) &&
360 hdr.elf.e_ident[EI_CLASS] == ELF_TARG_CLASS) {
361 /* Handle default ELF objects on this architecture */
362 Elf_Phdr phdr;
363 int dynamic, i;
364
365 dynamic = 0;
366 *type = TYPE_ELF;
367
368 if (lseek(fd, hdr.elf.e_phoff, SEEK_SET) == -1) {
369 warnx("%s: header too short", fname);
370 return (0);
371 }
372 for (i = 0; i < hdr.elf.e_phnum; i++) {
373 if (read(fd, &phdr, hdr.elf.e_phentsize)
374 != sizeof(phdr)) {
375 warnx("%s: can't read program header", fname);
376 return (0);
377 }
378 if (phdr.p_type == PT_DYNAMIC) {
379 dynamic = 1;
380 break;
381 }
382 }
383
384 if (!dynamic) {
385 warnx("%s: not a dynamic ELF executable", fname);
386 return (0);
387 }
388 if (hdr.elf.e_type == ET_DYN) {
389 switch (hdr.elf.e_ident[EI_OSABI]) {
390 case ELFOSABI_FREEBSD:
391 *is_shlib = 1;
392 return (1);
393#ifdef __ARM_EABI__
394 case ELFOSABI_NONE:
395 if (hdr.elf.e_machine != EM_ARM)
396 break;
397 if (EF_ARM_EABI_VERSION(hdr.elf.e_flags) <
398 EF_ARM_EABI_FREEBSD_MIN)
399 break;
400 *is_shlib = 1;
401 return (1);
402#endif
403 }
404 warnx("%s: not a FreeBSD ELF shared object", fname);
405 return (0);
406 }
407
408 return (1);
409 }
410
411 warnx("%s: not a dynamic executable", fname);
412 return (0);
413}
| 92 int i, rval, status;
93
94 LDD_UNSETENV("TRACE_LOADED_OBJECTS");
95 rval = 0;
96 i = 0;
97 argv[i++] = strdup(_PATH_LDD32);
98 if (aflag)
99 argv[i++] = strdup("-a");
100 if (vflag)
101 argv[i++] = strdup("-v");
102 if (fmt1 != NULL) {
103 argv[i++] = strdup("-f");
104 argv[i++] = strdup(fmt1);
105 }
106 if (fmt2 != NULL) {
107 argv[i++] = strdup("-f");
108 argv[i++] = strdup(fmt2);
109 }
110 argv[i++] = strdup(file);
111 argv[i++] = NULL;
112
113 switch (fork()) {
114 case -1:
115 err(1, "fork");
116 break;
117 case 0:
118 execv(_PATH_LDD32, argv);
119 warn("%s", _PATH_LDD32);
120 _exit(127);
121 break;
122 default:
123 if (wait(&status) < 0)
124 rval = 1;
125 else if (WIFSIGNALED(status))
126 rval = 1;
127 else if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
128 rval = 1;
129 break;
130 }
131 while (i--)
132 free(argv[i]);
133 LDD_SETENV("TRACE_LOADED_OBJECTS", "yes", 1);
134 return (rval);
135}
136#endif
137
138int
139main(int argc, char *argv[])
140{
141 char *fmt1, *fmt2;
142 int rval, c, aflag, vflag;
143
144 aflag = vflag = 0;
145 fmt1 = fmt2 = NULL;
146
147 while ((c = getopt(argc, argv, "af:v")) != -1) {
148 switch (c) {
149 case 'a':
150 aflag++;
151 break;
152 case 'f':
153 if (fmt1 != NULL) {
154 if (fmt2 != NULL)
155 errx(1, "too many formats");
156 fmt2 = optarg;
157 } else
158 fmt1 = optarg;
159 break;
160 case 'v':
161 vflag++;
162 break;
163 default:
164 usage();
165 /* NOTREACHED */
166 }
167 }
168 argc -= optind;
169 argv += optind;
170
171 if (vflag && fmt1 != NULL)
172 errx(1, "-v may not be used with -f");
173
174 if (argc <= 0) {
175 usage();
176 /* NOTREACHED */
177 }
178
179#ifdef __i386__
180 if (vflag) {
181 for (c = 0; c < argc; c++)
182 dump_file(argv[c]);
183 exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
184 }
185#endif
186
187 rval = 0;
188 for (; argc > 0; argc--, argv++) {
189 int fd, status, is_shlib, rv, type;
190
191 if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
192 warn("%s", *argv);
193 rval |= 1;
194 continue;
195 }
196 rv = is_executable(*argv, fd, &is_shlib, &type);
197 close(fd);
198 if (rv == 0) {
199 rval |= 1;
200 continue;
201 }
202
203 switch (type) {
204 case TYPE_ELF:
205 case TYPE_AOUT:
206 break;
207#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
208 case TYPE_ELF32:
209 rval |= execldd32(*argv, fmt1, fmt2, aflag, vflag);
210 continue;
211#endif
212 case TYPE_UNKNOWN:
213 default:
214 /*
215 * This shouldn't happen unless is_executable()
216 * is broken.
217 */
218 errx(EDOOFUS, "unknown executable type");
219 }
220
221 /* ld.so magic */
222 LDD_SETENV("TRACE_LOADED_OBJECTS", "yes", 1);
223 if (fmt1 != NULL)
224 LDD_SETENV("TRACE_LOADED_OBJECTS_FMT1", fmt1, 1);
225 if (fmt2 != NULL)
226 LDD_SETENV("TRACE_LOADED_OBJECTS_FMT2", fmt2, 1);
227
228 LDD_SETENV("TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1);
229 if (aflag)
230 LDD_SETENV("TRACE_LOADED_OBJECTS_ALL", "1", 1);
231 else if (fmt1 == NULL && fmt2 == NULL)
232 /* Default formats */
233 printf("%s:\n", *argv);
234 fflush(stdout);
235
236 switch (fork()) {
237 case -1:
238 err(1, "fork");
239 break;
240 default:
241 if (wait(&status) < 0) {
242 warn("wait");
243 rval |= 1;
244 } else if (WIFSIGNALED(status)) {
245 fprintf(stderr, "%s: signal %d\n", *argv,
246 WTERMSIG(status));
247 rval |= 1;
248 } else if (WIFEXITED(status) &&
249 WEXITSTATUS(status) != 0) {
250 fprintf(stderr, "%s: exit status %d\n", *argv,
251 WEXITSTATUS(status));
252 rval |= 1;
253 }
254 break;
255 case 0:
256 if (is_shlib == 0) {
257 execl(*argv, *argv, (char *)NULL);
258 warn("%s", *argv);
259 } else {
260 dlopen(*argv, RTLD_TRACE);
261 warnx("%s: %s", *argv, dlerror());
262 }
263 _exit(1);
264 }
265 }
266
267 return rval;
268}
269
270static void
271usage(void)
272{
273
274 fprintf(stderr, "usage: ldd [-a] [-v] [-f format] program ...\n");
275 exit(1);
276}
277
278static int
279is_executable(const char *fname, int fd, int *is_shlib, int *type)
280{
281 union {
282#ifdef AOUT_SUPPORTED
283 struct exec aout;
284#endif
285#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
286 Elf32_Ehdr elf32;
287#endif
288 Elf_Ehdr elf;
289 } hdr;
290 int n;
291
292 *is_shlib = 0;
293 *type = TYPE_UNKNOWN;
294
295 if ((n = read(fd, &hdr, sizeof(hdr))) == -1) {
296 warn("%s: can't read program header", fname);
297 return (0);
298 }
299
300#ifdef AOUT_SUPPORTED
301 if ((size_t)n >= sizeof(hdr.aout) && !N_BADMAG(hdr.aout)) {
302 /* a.out file */
303 if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC
304#if 1 /* Compatibility */
305 || hdr.aout.a_entry < __LDPGSZ
306#endif
307 ) {
308 warnx("%s: not a dynamic executable", fname);
309 return (0);
310 }
311 *type = TYPE_AOUT;
312 return (1);
313 }
314#endif
315
316#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
317 if ((size_t)n >= sizeof(hdr.elf32) && IS_ELF(hdr.elf32) &&
318 hdr.elf32.e_ident[EI_CLASS] == ELFCLASS32) {
319 /* Handle 32 bit ELF objects */
320 Elf32_Phdr phdr;
321 int dynamic, i;
322
323 dynamic = 0;
324 *type = TYPE_ELF32;
325
326 if (lseek(fd, hdr.elf32.e_phoff, SEEK_SET) == -1) {
327 warnx("%s: header too short", fname);
328 return (0);
329 }
330 for (i = 0; i < hdr.elf32.e_phnum; i++) {
331 if (read(fd, &phdr, hdr.elf32.e_phentsize) !=
332 sizeof(phdr)) {
333 warnx("%s: can't read program header", fname);
334 return (0);
335 }
336 if (phdr.p_type == PT_DYNAMIC) {
337 dynamic = 1;
338 break;
339 }
340 }
341
342 if (!dynamic) {
343 warnx("%s: not a dynamic ELF executable", fname);
344 return (0);
345 }
346 if (hdr.elf32.e_type == ET_DYN) {
347 if (hdr.elf32.e_ident[EI_OSABI] == ELFOSABI_FREEBSD) {
348 *is_shlib = 1;
349 return (1);
350 }
351 warnx("%s: not a FreeBSD ELF shared object", fname);
352 return (0);
353 }
354
355 return (1);
356 }
357#endif
358
359 if ((size_t)n >= sizeof(hdr.elf) && IS_ELF(hdr.elf) &&
360 hdr.elf.e_ident[EI_CLASS] == ELF_TARG_CLASS) {
361 /* Handle default ELF objects on this architecture */
362 Elf_Phdr phdr;
363 int dynamic, i;
364
365 dynamic = 0;
366 *type = TYPE_ELF;
367
368 if (lseek(fd, hdr.elf.e_phoff, SEEK_SET) == -1) {
369 warnx("%s: header too short", fname);
370 return (0);
371 }
372 for (i = 0; i < hdr.elf.e_phnum; i++) {
373 if (read(fd, &phdr, hdr.elf.e_phentsize)
374 != sizeof(phdr)) {
375 warnx("%s: can't read program header", fname);
376 return (0);
377 }
378 if (phdr.p_type == PT_DYNAMIC) {
379 dynamic = 1;
380 break;
381 }
382 }
383
384 if (!dynamic) {
385 warnx("%s: not a dynamic ELF executable", fname);
386 return (0);
387 }
388 if (hdr.elf.e_type == ET_DYN) {
389 switch (hdr.elf.e_ident[EI_OSABI]) {
390 case ELFOSABI_FREEBSD:
391 *is_shlib = 1;
392 return (1);
393#ifdef __ARM_EABI__
394 case ELFOSABI_NONE:
395 if (hdr.elf.e_machine != EM_ARM)
396 break;
397 if (EF_ARM_EABI_VERSION(hdr.elf.e_flags) <
398 EF_ARM_EABI_FREEBSD_MIN)
399 break;
400 *is_shlib = 1;
401 return (1);
402#endif
403 }
404 warnx("%s: not a FreeBSD ELF shared object", fname);
405 return (0);
406 }
407
408 return (1);
409 }
410
411 warnx("%s: not a dynamic executable", fname);
412 return (0);
413}
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