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Revision 1.50 - (show annotations) (download) (as text)
Wed May 18 04:10:14 2005 UTC (9 years, 3 months ago) by vapier
Branch: MAIN
Changes since 1.49: +4 -3 lines
File MIME type: text/x-csrc
add BIND to all output

1 /*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation
4 * Distributed under the terms of the GNU General Public License v2
5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.49 2005/05/18 04:08:30 vapier Exp $
6 *
7 ********************************************************************
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */
23
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <sys/types.h>
27 #define __USE_GNU
28 #include <string.h>
29 #include <errno.h>
30 #include <unistd.h>
31 #include <sys/stat.h>
32 #include <dirent.h>
33 #include <getopt.h>
34 #include <assert.h>
35
36 #include "paxelf.h"
37
38 static const char *rcsid = "$Id: scanelf.c,v 1.49 2005/05/18 04:08:30 vapier Exp $";
39 #define argv0 "scanelf"
40
41
42
43 /* prototypes */
44 static void scanelf_file(const char *filename);
45 static void scanelf_dir(const char *path);
46 static void scanelf_ldpath();
47 static void scanelf_envpath();
48 static void usage(int status);
49 static void parseargs(int argc, char *argv[]);
50 static char *xstrdup(char *s);
51 static void *xmalloc(size_t size);
52 static void xstrcat(char **dst, const char *src, size_t *curr_len);
53 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54 static int xemptybuffer(const char *buff);
55
56 /* variables to control behavior */
57 static char *ldpaths[256];
58 static char scan_ldpath = 0;
59 static char scan_envpath = 0;
60 static char scan_symlink = 1;
61 static char dir_recurse = 0;
62 static char dir_crossmount = 1;
63 static char show_pax = 0;
64 static char show_stack = 0;
65 static char show_textrel = 0;
66 static char show_rpath = 0;
67 static char show_needed = 0;
68 static char show_interp = 0;
69 static char show_bind = 0;
70 static char show_banner = 1;
71 static char be_quiet = 0;
72 static char be_verbose = 0;
73 static char *find_sym = NULL, *versioned_symname = NULL;
74 static char *out_format = NULL;
75
76
77
78 /* sub-funcs for scanelf_file() */
79 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
80 {
81 static char *paxflags;
82
83 if (!show_pax) return NULL;
84
85 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
86 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
87 *found_pax = 1;
88 return paxflags;
89 }
90
91 return NULL;
92 }
93 static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
94 {
95 static char ret[8];
96 char *found;
97 unsigned long i, off, shown;
98
99 if (!show_stack) return NULL;
100
101 shown = 0;
102 strcpy(ret, "--- ---");
103
104 if (elf->phdr) {
105 #define SHOW_STACK(B) \
106 if (elf->elf_class == ELFCLASS ## B) { \
107 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
108 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
109 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
110 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
111 found = found_stack; \
112 off = 0; \
113 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
114 found = found_relro; \
115 off = 3; \
116 } else \
117 continue; \
118 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
119 continue; \
120 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
121 *found = 1; \
122 ++shown; \
123 } \
124 }
125 SHOW_STACK(32)
126 SHOW_STACK(64)
127 }
128
129 if (be_quiet && !shown)
130 return NULL;
131 else
132 return ret;
133 }
134 static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
135 {
136 static char *ret = "TEXTREL";
137 unsigned long i;
138
139 if (!show_textrel) return NULL;
140
141 if (elf->phdr) {
142 #define SHOW_TEXTREL(B) \
143 if (elf->elf_class == ELFCLASS ## B) { \
144 Elf ## B ## _Dyn *dyn; \
145 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
146 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
147 Elf ## B ## _Off offset; \
148 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
149 if (phdr[i].p_type != PT_DYNAMIC) continue; \
150 offset = EGET(phdr[i].p_offset); \
151 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
152 dyn = DYN ## B (elf->data + offset); \
153 while (EGET(dyn->d_tag) != DT_NULL) { \
154 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
155 *found_textrel = 1; \
156 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
157 return ret; \
158 } \
159 ++dyn; \
160 } \
161 } }
162 SHOW_TEXTREL(32)
163 SHOW_TEXTREL(64)
164 }
165
166 if (be_quiet)
167 return NULL;
168 else
169 return " - ";
170 }
171 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
172 {
173 /* TODO: when checking RPATH entries, check each subpath (between :) in ld.so.conf */
174 unsigned long i, s;
175 char *rpath, *runpath, **r;
176 void *strtbl_void;
177
178 if (!show_rpath) return;
179
180 strtbl_void = elf_findsecbyname(elf, ".dynstr");
181 rpath = runpath = NULL;
182
183 if (elf->phdr && strtbl_void) {
184 #define SHOW_RPATH(B) \
185 if (elf->elf_class == ELFCLASS ## B) { \
186 Elf ## B ## _Dyn *dyn; \
187 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
188 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
189 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
190 Elf ## B ## _Off offset; \
191 Elf ## B ## _Sxword word; \
192 /* Scan all the program headers */ \
193 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
194 /* Just scan dynamic headers */ \
195 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
196 offset = EGET(phdr[i].p_offset); \
197 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
198 /* Just scan dynamic RPATH/RUNPATH headers */ \
199 dyn = DYN ## B (elf->data + offset); \
200 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
201 if (word == DT_RPATH) { \
202 r = &rpath; \
203 } else if (word == DT_RUNPATH) { \
204 r = &runpath; \
205 } else { \
206 ++dyn; \
207 continue; \
208 } \
209 /* Verify the memory is somewhat sane */ \
210 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
211 if (offset < elf->len) { \
212 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
213 *r = (char*)(elf->data + offset); \
214 /* If quiet, don't output paths in ld.so.conf */ \
215 if (be_quiet) \
216 for (s = 0; ldpaths[s]; ++s) \
217 if (!strcmp(ldpaths[s], *r)) { \
218 *r = NULL; \
219 break; \
220 } \
221 if (*r) *found_rpath = 1; \
222 } \
223 ++dyn; \
224 } \
225 } }
226 SHOW_RPATH(32)
227 SHOW_RPATH(64)
228 }
229
230 if (rpath && runpath) {
231 if (!strcmp(rpath, runpath)) {
232 xstrcat(ret, runpath, ret_len);
233 } else {
234 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
235 xchrcat(ret, '{', ret_len);
236 xstrcat(ret, rpath, ret_len);
237 xchrcat(ret, ',', ret_len);
238 xstrcat(ret, runpath, ret_len);
239 xchrcat(ret, '}', ret_len);
240 }
241 } else if (rpath || runpath)
242 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
243 else if (!be_quiet)
244 xstrcat(ret, " - ", ret_len);
245 }
246 static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
247 {
248 unsigned long i;
249 char *needed;
250 void *strtbl_void;
251
252 if (!show_needed) return;
253
254 strtbl_void = elf_findsecbyname(elf, ".dynstr");
255
256 if (elf->phdr && strtbl_void) {
257 #define SHOW_NEEDED(B) \
258 if (elf->elf_class == ELFCLASS ## B) { \
259 Elf ## B ## _Dyn *dyn; \
260 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
261 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
262 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
263 Elf ## B ## _Off offset; \
264 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
265 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
266 offset = EGET(phdr[i].p_offset); \
267 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
268 dyn = DYN ## B (elf->data + offset); \
269 while (EGET(dyn->d_tag) != DT_NULL) { \
270 if (EGET(dyn->d_tag) == DT_NEEDED) { \
271 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
272 if (offset >= elf->len) { \
273 ++dyn; \
274 continue; \
275 } \
276 needed = (char*)(elf->data + offset); \
277 if (*found_needed) xchrcat(ret, ',', ret_len); \
278 xstrcat(ret, needed, ret_len); \
279 *found_needed = 1; \
280 } \
281 ++dyn; \
282 } \
283 } }
284 SHOW_NEEDED(32)
285 SHOW_NEEDED(64)
286 }
287 }
288 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
289 {
290 void *strtbl_void;
291
292 if (!show_interp) return NULL;
293
294 strtbl_void = elf_findsecbyname(elf, ".interp");
295
296 if (strtbl_void) {
297 #define SHOW_INTERP(B) \
298 if (elf->elf_class == ELFCLASS ## B) { \
299 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
300 *found_interp = 1; \
301 return elf->data + EGET(strtbl->sh_offset); \
302 }
303 SHOW_INTERP(32)
304 SHOW_INTERP(64)
305 }
306 return NULL;
307 }
308 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
309 {
310 unsigned long i;
311 struct stat s;
312
313 if (!show_bind) return NULL;
314
315 #define SHOW_BIND(B) \
316 if (elf->elf_class == ELFCLASS ## B) { \
317 Elf ## B ## _Dyn *dyn; \
318 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
319 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
320 Elf ## B ## _Off offset; \
321 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
322 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
323 offset = EGET(phdr[i].p_offset); \
324 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
325 dyn = DYN ## B (elf->data + offset); \
326 while (EGET(dyn->d_tag) != DT_NULL) { \
327 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
328 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
329 { \
330 if (be_quiet) return NULL; \
331 *found_bind = 1; \
332 return "NOW"; \
333 } \
334 ++dyn; \
335 } \
336 } \
337 }
338 SHOW_BIND(32)
339 SHOW_BIND(64)
340
341 fstat(elf->fd, &s);
342 if (be_quiet && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
343 return NULL;
344 } else {
345 *found_bind = 1;
346 return "LAZY";
347 }
348 }
349 static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
350 {
351 unsigned long i;
352 void *symtab_void, *strtab_void;
353
354 if (!find_sym) return NULL;
355
356 symtab_void = elf_findsecbyname(elf, ".symtab");
357 strtab_void = elf_findsecbyname(elf, ".strtab");
358
359 if (symtab_void && strtab_void) {
360 #define FIND_SYM(B) \
361 if (elf->elf_class == ELFCLASS ## B) { \
362 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
363 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
364 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
365 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
366 char *symname; \
367 for (i = 0; i < cnt; ++i) { \
368 if (sym->st_name) { \
369 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
370 if (*find_sym == '*') { \
371 printf("%s(%s) %5lX %15s %s\n", \
372 ((*found_sym == 0) ? "\n\t" : "\t"), \
373 (char *)basename(filename), \
374 (long)sym->st_size, \
375 (char *)get_elfstttype(sym->st_info), \
376 symname); \
377 *found_sym = 1; \
378 } else if ((strcmp(find_sym, symname) == 0) || \
379 (strcmp(symname, versioned_symname) == 0)) \
380 (*found_sym)++; \
381 } \
382 ++sym; \
383 } }
384 FIND_SYM(32)
385 FIND_SYM(64)
386 }
387 if (*find_sym != '*' && *found_sym)
388 return find_sym;
389 if (be_quiet)
390 return NULL;
391 else
392 return " - ";
393 }
394 /* scan an elf file and show all the fun stuff */
395 #define prints(str) fputs(str, stdout)
396 static void scanelf_file(const char *filename)
397 {
398 unsigned long i;
399 char found_pax, found_stack, found_relro, found_textrel,
400 found_rpath, found_needed, found_interp, found_bind,
401 found_sym, found_file;
402 elfobj *elf;
403 struct stat st;
404 static char *out_buffer = NULL;
405 static size_t out_len;
406
407 /* make sure 'filename' exists */
408 if (lstat(filename, &st) == -1) {
409 if (be_verbose > 2) printf("%s: does not exist\n", filename);
410 return;
411 }
412 /* always handle regular files and handle symlinked files if no -y */
413 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
414 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
415 return;
416 }
417
418 found_pax = found_stack = found_relro = found_textrel = \
419 found_rpath = found_needed = found_interp = found_bind = \
420 found_sym = found_file = 0;
421
422 /* verify this is real ELF */
423 if ((elf = readelf(filename)) == NULL) {
424 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
425 return;
426 }
427
428 if (be_verbose > 1)
429 printf("%s: scanning file {%s,%s}\n", filename,
430 get_elfeitype(elf, EI_CLASS, elf->elf_class),
431 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
432 else if (be_verbose)
433 printf("%s: scanning file\n", filename);
434
435 /* init output buffer */
436 if (!out_buffer) {
437 out_len = sizeof(char) * 80;
438 out_buffer = (char*)xmalloc(out_len);
439 }
440 *out_buffer = '\0';
441
442 /* show the header */
443 if (!be_quiet && show_banner) {
444 for (i = 0; out_format[i]; ++i) {
445 if (out_format[i] != '%') continue;
446
447 switch (out_format[++i]) {
448 case '%': break;
449 case 'F': prints("FILE "); found_file = 1; break;
450 case 'o': prints(" TYPE "); break;
451 case 'x': prints(" PAX "); break;
452 case 'e': prints("STK/REL "); break;
453 case 't': prints("TEXTREL "); break;
454 case 'r': prints("RPATH "); break;
455 case 'n': prints("NEEDED "); break;
456 case 'i': prints("INTERP "); break;
457 case 'b': prints("BIND "); break;
458 case 's': prints("SYM "); break;
459 }
460 }
461 if (!found_file) prints("FILE ");
462 prints("\n");
463 found_file = 0;
464 show_banner = 0;
465 }
466
467 /* dump all the good stuff */
468 for (i = 0; out_format[i]; ++i) {
469 const char *out;
470
471 /* make sure we trim leading spaces in quiet mode */
472 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
473 *out_buffer = '\0';
474
475 if (out_format[i] != '%') {
476 xchrcat(&out_buffer, out_format[i], &out_len);
477 continue;
478 }
479
480 out = NULL;
481 switch (out_format[++i]) {
482 case '%': xchrcat(&out_buffer, '%', &out_len); break;
483 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
484 case 'o': out = get_elfetype(elf); break;
485 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
486 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
487 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
488 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
489 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
490 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
491 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
492 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
493 }
494 if (out) xstrcat(&out_buffer, out, &out_len);
495 }
496
497 if (!found_file) {
498 if (!be_quiet || found_pax || found_stack || found_textrel || \
499 found_rpath || found_needed || found_interp || found_bind || \
500 found_sym)
501 {
502 xchrcat(&out_buffer, ' ', &out_len);
503 xstrcat(&out_buffer, filename, &out_len);
504 }
505 }
506 if (!(be_quiet && xemptybuffer(out_buffer)))
507 puts(out_buffer);
508
509 unreadelf(elf);
510 }
511
512 /* scan a directory for ET_EXEC files and print when we find one */
513 static void scanelf_dir(const char *path)
514 {
515 register DIR *dir;
516 register struct dirent *dentry;
517 struct stat st_top, st;
518 char buf[_POSIX_PATH_MAX];
519 size_t pathlen = 0, len = 0;
520
521 /* make sure path exists */
522 if (lstat(path, &st_top) == -1) {
523 if (be_verbose > 2) printf("%s: does not exist\n", path);
524 return;
525 }
526
527 /* ok, if it isn't a directory, assume we can open it */
528 if (!S_ISDIR(st_top.st_mode)) {
529 scanelf_file(path);
530 return;
531 }
532
533 /* now scan the dir looking for fun stuff */
534 if ((dir = opendir(path)) == NULL) {
535 warnf("could not opendir %s: %s", path, strerror(errno));
536 return;
537 }
538 if (be_verbose) printf("%s: scanning dir\n", path);
539
540 pathlen = strlen(path);
541 while ((dentry = readdir(dir))) {
542 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
543 continue;
544 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
545 if (len >= sizeof(buf)) {
546 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
547 continue;
548 }
549 sprintf(buf, "%s/%s", path, dentry->d_name);
550 if (lstat(buf, &st) != -1) {
551 if (S_ISREG(st.st_mode))
552 scanelf_file(buf);
553 else if (dir_recurse && S_ISDIR(st.st_mode)) {
554 if (dir_crossmount || (st_top.st_dev == st.st_dev))
555 scanelf_dir(buf);
556 }
557 }
558 }
559 closedir(dir);
560 }
561
562 static int scanelf_from_file(char *filename)
563 {
564 FILE *fp = NULL;
565 char *p;
566 char path[_POSIX_PATH_MAX];
567
568 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
569 fp = stdin;
570 else if ((fp = fopen(filename, "r")) == NULL)
571 return 1;
572
573 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
574 if ((p = strchr(path, '\n')) != NULL)
575 *p = 0;
576 scanelf_dir(path);
577 }
578 if (fp != stdin)
579 fclose(fp);
580 return 0;
581 }
582
583 static void load_ld_so_conf()
584 {
585 FILE *fp = NULL;
586 char *p;
587 char path[_POSIX_PATH_MAX];
588 int i = 0;
589
590 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
591 return;
592
593 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
594 if (*path != '/')
595 continue;
596
597 if ((p = strrchr(path, '\r')) != NULL)
598 *p = 0;
599 if ((p = strchr(path, '\n')) != NULL)
600 *p = 0;
601
602 ldpaths[i++] = xstrdup(path);
603
604 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
605 break;
606 }
607 ldpaths[i] = NULL;
608
609 fclose(fp);
610 }
611
612 /* scan /etc/ld.so.conf for paths */
613 static void scanelf_ldpath()
614 {
615 char scan_l, scan_ul, scan_ull;
616 int i = 0;
617
618 if (!ldpaths[0])
619 err("Unable to load any paths from ld.so.conf");
620
621 scan_l = scan_ul = scan_ull = 0;
622
623 while (ldpaths[i]) {
624 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
625 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
626 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
627 scanelf_dir(ldpaths[i]);
628 ++i;
629 }
630
631 if (!scan_l) scanelf_dir("/lib");
632 if (!scan_ul) scanelf_dir("/usr/lib");
633 if (!scan_ull) scanelf_dir("/usr/local/lib");
634 }
635
636 /* scan env PATH for paths */
637 static void scanelf_envpath()
638 {
639 char *path, *p;
640
641 path = getenv("PATH");
642 if (!path)
643 err("PATH is not set in your env !");
644 path = xstrdup(path);
645
646 while ((p = strrchr(path, ':')) != NULL) {
647 scanelf_dir(p + 1);
648 *p = 0;
649 }
650
651 free(path);
652 }
653
654
655
656 /* usage / invocation handling functions */
657 #define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV"
658 #define a_argument required_argument
659 static struct option const long_opts[] = {
660 {"path", no_argument, NULL, 'p'},
661 {"ldpath", no_argument, NULL, 'l'},
662 {"recursive", no_argument, NULL, 'R'},
663 {"mount", no_argument, NULL, 'm'},
664 {"symlink", no_argument, NULL, 'y'},
665 {"pax", no_argument, NULL, 'x'},
666 {"header", no_argument, NULL, 'e'},
667 {"textrel", no_argument, NULL, 't'},
668 {"rpath", no_argument, NULL, 'r'},
669 {"needed", no_argument, NULL, 'n'},
670 {"interp", no_argument, NULL, 'i'},
671 {"bind", no_argument, NULL, 'b'},
672 {"symbol", a_argument, NULL, 's'},
673 {"all", no_argument, NULL, 'a'},
674 {"quiet", no_argument, NULL, 'q'},
675 {"verbose", no_argument, NULL, 'v'},
676 {"format", a_argument, NULL, 'F'},
677 {"from", a_argument, NULL, 'f'},
678 {"file", a_argument, NULL, 'o'},
679 {"nobanner", no_argument, NULL, 'B'},
680 {"help", no_argument, NULL, 'h'},
681 {"version", no_argument, NULL, 'V'},
682 {NULL, no_argument, NULL, 0x0}
683 };
684 static char *opts_help[] = {
685 "Scan all directories in PATH environment",
686 "Scan all directories in /etc/ld.so.conf",
687 "Scan directories recursively",
688 "Don't recursively cross mount points",
689 "Don't scan symlinks\n",
690 "Print PaX markings",
691 "Print GNU_STACK markings",
692 "Print TEXTREL information",
693 "Print RPATH information",
694 "Print NEEDED information",
695 "Print INTERP information",
696 "Print BIND information",
697 "Find a specified symbol",
698 "Print all scanned info (-x -e -t -r -n -i)\n",
699 "Only output 'bad' things",
700 "Be verbose (can be specified more than once)",
701 "Use specified format for output",
702 "Read input stream from a filename",
703 "Write output stream to a filename",
704 "Don't display the header",
705 "Print this help and exit",
706 "Print version and exit",
707 NULL
708 };
709
710 /* display usage and exit */
711 static void usage(int status)
712 {
713 unsigned long i;
714 printf(" Scan ELF binaries for stuff\n\n"
715 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
716 printf("Options: -[%s]\n", PARSE_FLAGS);
717 for (i = 0; long_opts[i].name; ++i)
718 if (long_opts[i].has_arg == no_argument)
719 printf(" -%c, --%-13s %s\n", long_opts[i].val,
720 long_opts[i].name, opts_help[i]);
721 else
722 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val,
723 long_opts[i].name, opts_help[i]);
724
725 if (status != EXIT_SUCCESS)
726 exit(status);
727
728 puts("\nThe format modifiers for the -F option are:");
729 puts(" %F Filename \t%x PaX Flags \t%e STACK/RELRO");
730 puts(" %t TEXTREL \t%r RPATH \t%n NEEDED");
731 puts(" %i INTERP \t%b BIND \t%s symbol");
732
733 exit(status);
734 }
735
736 /* parse command line arguments and preform needed actions */
737 static void parseargs(int argc, char *argv[])
738 {
739 int i;
740 char *from_file = NULL;
741
742 opterr = 0;
743 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
744 switch (i) {
745
746 case 'V':
747 printf("%s compiled %s\n%s\n"
748 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
749 __FILE__, __DATE__, rcsid, argv0);
750 exit(EXIT_SUCCESS);
751 break;
752 case 'h': usage(EXIT_SUCCESS); break;
753 case 'f':
754 if (from_file == NULL)
755 from_file = xstrdup(optarg);
756 break;
757 case 'o': {
758 FILE *fp = NULL;
759 fp = freopen(optarg, "w", stdout);
760 if (fp == NULL)
761 err("Could not open output stream '%s': %s", optarg, strerror(errno));
762 stdout = fp;
763 break;
764 }
765
766 case 's': {
767 size_t len;
768 find_sym = xstrdup(optarg);
769 len = strlen(find_sym) + 1;
770 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
771 sprintf(versioned_symname, "%s@", find_sym);
772 break;
773 }
774
775 case 'F': {
776 out_format = xstrdup(optarg);
777 break;
778 }
779
780 case 'y': scan_symlink = 0; break;
781 case 'B': show_banner = 0; break;
782 case 'l': scan_ldpath = 1; break;
783 case 'p': scan_envpath = 1; break;
784 case 'R': dir_recurse = 1; break;
785 case 'm': dir_crossmount = 0; break;
786 case 'x': show_pax = 1; break;
787 case 'e': show_stack = 1; break;
788 case 't': show_textrel = 1; break;
789 case 'r': show_rpath = 1; break;
790 case 'n': show_needed = 1; break;
791 case 'i': show_interp = 1; break;
792 case 'b': show_bind = 1; break;
793 case 'q': be_quiet = 1; break;
794 case 'v': be_verbose = (be_verbose % 20) + 1; break;
795 case 'a': show_pax = show_stack = show_textrel = show_rpath = \
796 show_needed = show_interp = show_bind = 1; break;
797
798 case ':':
799 err("Option missing parameter\n");
800 case '?':
801 err("Unknown option\n");
802 default:
803 err("Unhandled option '%c'", i);
804 }
805 }
806
807 /* let the format option override all other options */
808 if (out_format) {
809 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0;
810 for (i = 0; out_format[i]; ++i) {
811 if (out_format[i] != '%') continue;
812
813 switch (out_format[++i]) {
814 case '%': break;
815 case 'F': break;
816 case 's': break;
817 case 'o': break;
818 case 'x': show_pax = 1; break;
819 case 'e': show_stack = 1; break;
820 case 't': show_textrel = 1; break;
821 case 'r': show_rpath = 1; break;
822 case 'n': show_needed = 1; break;
823 case 'i': show_interp = 1; break;
824 case 'b': show_bind = 1; break;
825 default:
826 err("Invalid format specifier '%c' (byte %i)",
827 out_format[i], i+1);
828 }
829 }
830
831 /* construct our default format */
832 } else {
833 size_t fmt_len = 30;
834 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
835 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
836 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
837 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
838 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
839 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
840 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
841 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
842 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
843 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
844 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
845 }
846 if (be_verbose > 2) printf("Format: %s\n", out_format);
847
848 /* now lets actually do the scanning */
849 if (scan_ldpath || (show_rpath && be_quiet))
850 load_ld_so_conf();
851 if (scan_ldpath) scanelf_ldpath();
852 if (scan_envpath) scanelf_envpath();
853 if (from_file) {
854 scanelf_from_file(from_file);
855 free(from_file);
856 from_file = *argv;
857 }
858 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
859 err("Nothing to scan !?");
860 while (optind < argc)
861 scanelf_dir(argv[optind++]);
862
863 /* clean up */
864 if (find_sym) {
865 free(find_sym);
866 free(versioned_symname);
867 }
868 if (out_format) free(out_format);
869 for (i = 0; ldpaths[i]; ++i)
870 free(ldpaths[i]);
871 }
872
873
874
875 /* utility funcs */
876 static char *xstrdup(char *s)
877 {
878 char *ret = strdup(s);
879 if (!ret) err("Could not strdup(): %s", strerror(errno));
880 return ret;
881 }
882 static void *xmalloc(size_t size)
883 {
884 void *ret = malloc(size);
885 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
886 return ret;
887 }
888 static void xstrcat(char **dst, const char *src, size_t *curr_len)
889 {
890 long new_len;
891
892 new_len = strlen(*dst) + strlen(src);
893 if (*curr_len <= new_len) {
894 *curr_len = new_len + (*curr_len / 2);
895 *dst = realloc(*dst, *curr_len);
896 if (!*dst)
897 err("could not realloc %li bytes", (unsigned long)*curr_len);
898 }
899
900 strcat(*dst, src);
901 }
902 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
903 {
904 static char my_app[2];
905 my_app[0] = append;
906 my_app[1] = '\0';
907 xstrcat(dst, my_app, curr_len);
908 }
909 static int xemptybuffer(const char *buff)
910 {
911 long i;
912 for (i = 0; buff[i]; ++i)
913 if (buff[i] != ' ')
914 return 0;
915 return 1;
916 }
917
918
919
920 int main(int argc, char *argv[])
921 {
922 if (argc < 2)
923 usage(EXIT_FAILURE);
924 parseargs(argc, argv);
925 fclose(stdout);
926 return EXIT_SUCCESS;
927 }

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