/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.75 - (show annotations) (download) (as text)
Mon Jun 6 23:32:38 2005 UTC (9 years, 5 months ago) by vapier
Branch: MAIN
Changes since 1.74: +13 -8 lines
File MIME type: text/x-csrc
fix runpath parsing in quiet mode

1 /*
2 * Copyright 2003-2005 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.74 2005/06/05 09:42:06 vapier Exp $
5 *
6 ********************************************************************
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 * MA 02111-1307, USA.
21 */
22
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <sys/types.h>
26 #include <libgen.h>
27 #include <limits.h>
28 #define __USE_GNU
29 #include <string.h>
30 #include <errno.h>
31 #include <unistd.h>
32 #include <sys/stat.h>
33 #include <dirent.h>
34 #include <getopt.h>
35 #include <assert.h>
36 #include "paxelf.h"
37
38 static const char *rcsid = "$Id: scanelf.c,v 1.74 2005/06/05 09:42:06 vapier Exp $";
39 #define argv0 "scanelf"
40
41 #define IS_MODIFIER(c) (c == '%' || c == '#')
42
43
44
45 /* prototypes */
46 static void scanelf_file(const char *filename);
47 static void scanelf_dir(const char *path);
48 static void scanelf_ldpath();
49 static void scanelf_envpath();
50 static void usage(int status);
51 static void parseargs(int argc, char *argv[]);
52 static char *xstrdup(const char *s);
53 static void *xmalloc(size_t size);
54 static void xstrcat(char **dst, const char *src, size_t *curr_len);
55 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
56
57 /* variables to control behavior */
58 static char *ldpaths[256];
59 static char scan_ldpath = 0;
60 static char scan_envpath = 0;
61 static char scan_symlink = 1;
62 static char dir_recurse = 0;
63 static char dir_crossmount = 1;
64 static char show_pax = 0;
65 static char show_phdr = 0;
66 static char show_textrel = 0;
67 static char show_rpath = 0;
68 static char show_needed = 0;
69 static char show_interp = 0;
70 static char show_bind = 0;
71 static char show_banner = 1;
72 static char be_quiet = 0;
73 static char be_verbose = 0;
74 static char be_wewy_wewy_quiet = 0;
75 static char *find_sym = NULL, *versioned_symname = NULL;
76 static char *find_lib = NULL;
77 static char *out_format = NULL;
78 static char *search_path = NULL;
79
80
81
82 /* sub-funcs for scanelf_file() */
83 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
84 {
85 static char *paxflags;
86 static char ret[7];
87 unsigned long i, shown;
88
89
90 if (!show_pax) return NULL;
91
92 shown = 0;
93 memset(&ret, 0, sizeof(ret));
94
95 if (elf->phdr) {
96 #define SHOW_PAX(B) \
97 if (elf->elf_class == ELFCLASS ## B) { \
98 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
99 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
100 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
101 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
102 continue; \
103 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
104 continue; \
105 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
106 *found_pax = 1; \
107 ++shown; \
108 break; \
109 } \
110 }
111 SHOW_PAX(32)
112 SHOW_PAX(64)
113 }
114
115 /* fall back to EI_PAX if no PT_PAX was found */
116 if (!*ret) {
117 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
118 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
119 *found_pax = 1;
120 return paxflags;
121 }
122 strncpy(ret, paxflags, sizeof(ret));
123 // ++shown;
124 }
125
126 if (be_quiet && !shown)
127 return NULL;
128 return ret;
129
130 }
131 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
132 {
133 static char ret[12];
134 char *found;
135 unsigned long i, off, shown, check_flags;
136 unsigned char multi_stack, multi_relro, multi_load;
137
138 if (!show_phdr) return NULL;
139
140 memcpy(ret, "--- --- ---\0", 12);
141
142 shown = 0;
143 multi_stack = multi_relro = multi_load = 0;
144
145 if (elf->phdr) {
146 #define SHOW_PHDR(B) \
147 if (elf->elf_class == ELFCLASS ## B) { \
148 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
149 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
150 uint32_t flags; \
151 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
152 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
153 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
154 found = found_phdr; \
155 off = 0; \
156 check_flags = PF_X; \
157 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
158 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
159 found = found_relro; \
160 off = 4; \
161 check_flags = PF_X; \
162 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
163 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
164 found = found_load; \
165 off = 8; \
166 check_flags = PF_W|PF_X; \
167 } else \
168 continue; \
169 flags = EGET(phdr[i].p_flags); \
170 if (be_quiet && ((flags & check_flags) != check_flags)) \
171 continue; \
172 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \
173 *found = 1; \
174 ++shown; \
175 } \
176 }
177 SHOW_PHDR(32)
178 SHOW_PHDR(64)
179 }
180
181 if (be_quiet && !shown)
182 return NULL;
183 else
184 return ret;
185 }
186 static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
187 {
188 static char ret[] = "TEXTREL";
189 unsigned long i;
190
191 if (!show_textrel) return NULL;
192
193 if (elf->phdr) {
194 #define SHOW_TEXTREL(B) \
195 if (elf->elf_class == ELFCLASS ## B) { \
196 Elf ## B ## _Dyn *dyn; \
197 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
198 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
199 Elf ## B ## _Off offset; \
200 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
201 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
202 offset = EGET(phdr[i].p_offset); \
203 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
204 dyn = DYN ## B (elf->data + offset); \
205 while (EGET(dyn->d_tag) != DT_NULL) { \
206 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
207 *found_textrel = 1; \
208 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
209 return (be_wewy_wewy_quiet ? NULL : ret); \
210 } \
211 ++dyn; \
212 } \
213 } }
214 SHOW_TEXTREL(32)
215 SHOW_TEXTREL(64)
216 }
217
218 if (be_quiet || be_wewy_wewy_quiet)
219 return NULL;
220 else
221 return (char *)" - ";
222 }
223 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
224 {
225 unsigned long i, s;
226 char *rpath, *runpath, **r;
227 void *strtbl_void;
228
229 if (!show_rpath) return;
230
231 strtbl_void = elf_findsecbyname(elf, ".dynstr");
232 rpath = runpath = NULL;
233
234 if (elf->phdr && strtbl_void) {
235 #define SHOW_RPATH(B) \
236 if (elf->elf_class == ELFCLASS ## B) { \
237 Elf ## B ## _Dyn *dyn; \
238 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
240 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
241 Elf ## B ## _Off offset; \
242 Elf ## B ## _Xword word; \
243 /* Scan all the program headers */ \
244 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
245 /* Just scan dynamic headers */ \
246 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
247 offset = EGET(phdr[i].p_offset); \
248 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
249 /* Just scan dynamic RPATH/RUNPATH headers */ \
250 dyn = DYN ## B (elf->data + offset); \
251 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
252 if (word == DT_RPATH) { \
253 r = &rpath; \
254 } else if (word == DT_RUNPATH) { \
255 r = &runpath; \
256 } else { \
257 ++dyn; \
258 continue; \
259 } \
260 /* Verify the memory is somewhat sane */ \
261 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
262 if (offset < (Elf ## B ## _Off)elf->len) { \
263 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
264 *r = (char*)(elf->data + offset); \
265 /* If quiet, don't output paths in ld.so.conf */ \
266 if (be_quiet) { \
267 size_t len; \
268 char *start, *end; \
269 /* note that we only 'chop' off leading known paths. */ \
270 /* since *r is read-only memory, we can only move the ptr forward. */ \
271 start = *r; \
272 /* scan each path in : delimited list */ \
273 while (start) { \
274 end = strchr(start, ':'); \
275 len = (end ? abs(end - start) : strlen(start)); \
276 for (s = 0; ldpaths[s]; ++s) { \
277 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
278 *r = (end ? end + 1 : NULL); \
279 break; \
280 } \
281 } \
282 if (!*r || !ldpaths[s] || !end) \
283 start = NULL; \
284 else \
285 start = start + len + 1; \
286 } \
287 } \
288 if (*r) *found_rpath = 1; \
289 } \
290 ++dyn; \
291 } \
292 } }
293 SHOW_RPATH(32)
294 SHOW_RPATH(64)
295 }
296
297 if (be_wewy_wewy_quiet) return;
298
299 if (rpath && runpath) {
300 if (!strcmp(rpath, runpath)) {
301 xstrcat(ret, runpath, ret_len);
302 } else {
303 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
304 xchrcat(ret, '{', ret_len);
305 xstrcat(ret, rpath, ret_len);
306 xchrcat(ret, ',', ret_len);
307 xstrcat(ret, runpath, ret_len);
308 xchrcat(ret, '}', ret_len);
309 }
310 } else if (rpath || runpath)
311 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
312 else if (!be_quiet)
313 xstrcat(ret, " - ", ret_len);
314 }
315 static char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
316 {
317 unsigned long i;
318 char *needed;
319 void *strtbl_void;
320
321 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
322
323 strtbl_void = elf_findsecbyname(elf, ".dynstr");
324
325 if (elf->phdr && strtbl_void) {
326 #define SHOW_NEEDED(B) \
327 if (elf->elf_class == ELFCLASS ## B) { \
328 Elf ## B ## _Dyn *dyn; \
329 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
330 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
331 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
332 Elf ## B ## _Off offset; \
333 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
334 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
335 offset = EGET(phdr[i].p_offset); \
336 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
337 dyn = DYN ## B (elf->data + offset); \
338 while (EGET(dyn->d_tag) != DT_NULL) { \
339 if (EGET(dyn->d_tag) == DT_NEEDED) { \
340 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
341 if (offset >= (Elf ## B ## _Off)elf->len) { \
342 ++dyn; \
343 continue; \
344 } \
345 needed = (char*)(elf->data + offset); \
346 if (op == 0) { \
347 if (!be_wewy_wewy_quiet) { \
348 if (*found_needed) xchrcat(ret, ',', ret_len); \
349 xstrcat(ret, needed, ret_len); \
350 } \
351 *found_needed = 1; \
352 } else { \
353 if (strcmp(find_lib, needed)) return NULL; \
354 *found_lib = 1; \
355 return (be_wewy_wewy_quiet ? NULL : find_lib); \
356 } \
357 } \
358 ++dyn; \
359 } \
360 } }
361 SHOW_NEEDED(32)
362 SHOW_NEEDED(64)
363 }
364
365 return NULL;
366 }
367 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
368 {
369 void *strtbl_void;
370
371 if (!show_interp) return NULL;
372
373 strtbl_void = elf_findsecbyname(elf, ".interp");
374
375 if (strtbl_void) {
376 #define SHOW_INTERP(B) \
377 if (elf->elf_class == ELFCLASS ## B) { \
378 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
379 *found_interp = 1; \
380 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
381 }
382 SHOW_INTERP(32)
383 SHOW_INTERP(64)
384 }
385 return NULL;
386 }
387 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
388 {
389 unsigned long i;
390 struct stat s;
391
392 if (!show_bind) return NULL;
393 if (!elf->phdr) return NULL;
394
395 #define SHOW_BIND(B) \
396 if (elf->elf_class == ELFCLASS ## B) { \
397 Elf ## B ## _Dyn *dyn; \
398 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
399 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
400 Elf ## B ## _Off offset; \
401 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
402 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
403 offset = EGET(phdr[i].p_offset); \
404 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
405 dyn = DYN ## B (elf->data + offset); \
406 while (EGET(dyn->d_tag) != DT_NULL) { \
407 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
408 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
409 { \
410 if (be_quiet) return NULL; \
411 *found_bind = 1; \
412 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
413 } \
414 ++dyn; \
415 } \
416 } \
417 }
418 SHOW_BIND(32)
419 SHOW_BIND(64)
420
421 if (be_wewy_wewy_quiet) return NULL;
422
423 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
424 return NULL;
425 } else {
426 *found_bind = 1;
427 return (char *) "LAZY";
428 }
429 }
430 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
431 {
432 unsigned long i;
433 void *symtab_void, *strtab_void;
434
435 if (!find_sym) return NULL;
436
437 /* debug sections */
438 symtab_void = elf_findsecbyname(elf, ".symtab");
439 strtab_void = elf_findsecbyname(elf, ".strtab");
440 /* fall back to runtime sections */
441 if (!symtab_void || !strtab_void) {
442 symtab_void = elf_findsecbyname(elf, ".dynsym");
443 strtab_void = elf_findsecbyname(elf, ".dynstr");
444 }
445
446 if (symtab_void && strtab_void) {
447 char *base, *basemem;
448 basemem = xstrdup(elf->filename);
449 base = basename(basemem);
450 #define FIND_SYM(B) \
451 if (elf->elf_class == ELFCLASS ## B) { \
452 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
453 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
454 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
455 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
456 char *symname; \
457 for (i = 0; i < cnt; ++i) { \
458 if (sym->st_name) { \
459 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
460 if (*find_sym == '*') { \
461 printf("%s(%s) %5lX %15s %s\n", \
462 ((*found_sym == 0) ? "\n\t" : "\t"), \
463 base, \
464 (long)sym->st_size, \
465 (char *)get_elfstttype(sym->st_info), \
466 symname); \
467 *found_sym = 1; \
468 } else if ((strcmp(find_sym, symname) == 0) || \
469 (strcmp(symname, versioned_symname) == 0)) \
470 (*found_sym)++; \
471 } \
472 ++sym; \
473 } }
474 FIND_SYM(32)
475 FIND_SYM(64)
476 free(basemem);
477 }
478
479 if (be_wewy_wewy_quiet) return NULL;
480
481 if (*find_sym != '*' && *found_sym)
482 return find_sym;
483 if (be_quiet)
484 return NULL;
485 else
486 return (char *)" - ";
487 }
488 /* scan an elf file and show all the fun stuff */
489 #define prints(str) write(fileno(stdout), str, strlen(str))
490 static void scanelf_file(const char *filename)
491 {
492 unsigned long i;
493 char found_pax, found_phdr, found_relro, found_load, found_textrel,
494 found_rpath, found_needed, found_interp, found_bind,
495 found_sym, found_lib, found_file;
496 elfobj *elf;
497 struct stat st;
498 static char *out_buffer = NULL;
499 static size_t out_len;
500
501 /* make sure 'filename' exists */
502 if (lstat(filename, &st) == -1) {
503 if (be_verbose > 2) printf("%s: does not exist\n", filename);
504 return;
505 }
506 /* always handle regular files and handle symlinked files if no -y */
507 if (S_ISLNK(st.st_mode)) {
508 if (!scan_symlink) return;
509 stat(filename, &st);
510 }
511 if (!S_ISREG(st.st_mode)) {
512 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
513 return;
514 }
515
516 found_pax = found_phdr = found_relro = found_load = \
517 found_textrel = found_rpath = found_needed = found_interp = \
518 found_bind = found_sym = found_lib = found_file = 0;
519
520 /* verify this is real ELF */
521 if ((elf = readelf(filename)) == NULL) {
522 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
523 return;
524 }
525
526 if (be_verbose > 1)
527 printf("%s: scanning file {%s,%s}\n", filename,
528 get_elfeitype(EI_CLASS, elf->elf_class),
529 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
530 else if (be_verbose)
531 printf("%s: scanning file\n", filename);
532
533 /* init output buffer */
534 if (!out_buffer) {
535 out_len = sizeof(char) * 80;
536 out_buffer = (char*)xmalloc(out_len);
537 }
538 *out_buffer = '\0';
539
540 /* show the header */
541 if (!be_quiet && show_banner) {
542 for (i = 0; out_format[i]; ++i) {
543 if (!IS_MODIFIER(out_format[i])) continue;
544
545 switch (out_format[++i]) {
546 case '%': break;
547 case '#': break;
548 case 'F':
549 case 'p':
550 case 'f': prints("FILE "); found_file = 1; break;
551 case 'o': prints(" TYPE "); break;
552 case 'x': prints(" PAX "); break;
553 case 'e': prints("STK/REL/PTL "); break;
554 case 't': prints("TEXTREL "); break;
555 case 'r': prints("RPATH "); break;
556 case 'n': prints("NEEDED "); break;
557 case 'i': prints("INTERP "); break;
558 case 'b': prints("BIND "); break;
559 case 's': prints("SYM "); break;
560 case 'N': prints("LIB "); break;
561 }
562 }
563 if (!found_file) prints("FILE ");
564 prints("\n");
565 found_file = 0;
566 show_banner = 0;
567 }
568
569 /* dump all the good stuff */
570 for (i = 0; out_format[i]; ++i) {
571 const char *out;
572 const char *tmp;
573
574 /* make sure we trim leading spaces in quiet mode */
575 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
576 *out_buffer = '\0';
577
578 if (!IS_MODIFIER(out_format[i])) {
579 xchrcat(&out_buffer, out_format[i], &out_len);
580 continue;
581 }
582
583 out = NULL;
584 be_wewy_wewy_quiet = (out_format[i] == '#');
585 switch (out_format[++i]) {
586 case '%':
587 case '#':
588 xchrcat(&out_buffer, out_format[i], &out_len); break;
589 case 'F':
590 if (be_wewy_wewy_quiet) break;
591 found_file = 1;
592 xstrcat(&out_buffer, filename, &out_len);
593 break;
594 case 'p':
595 if (be_wewy_wewy_quiet) break;
596 found_file = 1;
597 tmp = filename;
598 if (search_path) {
599 ssize_t len_search = strlen(search_path);
600 ssize_t len_file = strlen(filename);
601 if (!strncmp(filename, search_path, len_search) && \
602 len_file > len_search)
603 tmp += len_search;
604 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
605 }
606 xstrcat(&out_buffer, tmp, &out_len);
607 break;
608 case 'f':
609 if (be_wewy_wewy_quiet) break;
610 found_file = 1;
611 tmp = strrchr(filename, '/');
612 tmp = (tmp == NULL ? filename : tmp+1);
613 xstrcat(&out_buffer, tmp, &out_len);
614 break;
615 case 'o': out = get_elfetype(elf); break;
616 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
617 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
618 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
619 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
620 case 'n':
621 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
622 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
623 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
624 case 's': out = scanelf_file_sym(elf, &found_sym); break;
625 }
626 if (out) xstrcat(&out_buffer, out, &out_len);
627 }
628
629 #define FOUND_SOMETHING() \
630 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
631 found_rpath || found_needed || found_interp || found_bind || found_sym || found_lib)
632
633 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
634 xchrcat(&out_buffer, ' ', &out_len);
635 xstrcat(&out_buffer, filename, &out_len);
636 }
637 if (!be_quiet || (be_quiet && FOUND_SOMETHING()))
638 puts(out_buffer);
639
640 unreadelf(elf);
641 }
642
643 /* scan a directory for ET_EXEC files and print when we find one */
644 static void scanelf_dir(const char *path)
645 {
646 register DIR *dir;
647 register struct dirent *dentry;
648 struct stat st_top, st;
649 char buf[_POSIX_PATH_MAX];
650 size_t pathlen = 0, len = 0;
651
652 /* make sure path exists */
653 if (lstat(path, &st_top) == -1) {
654 if (be_verbose > 2) printf("%s: does not exist\n", path);
655 return;
656 }
657
658 /* ok, if it isn't a directory, assume we can open it */
659 if (!S_ISDIR(st_top.st_mode)) {
660 scanelf_file(path);
661 return;
662 }
663
664 /* now scan the dir looking for fun stuff */
665 if ((dir = opendir(path)) == NULL) {
666 warnf("could not opendir %s: %s", path, strerror(errno));
667 return;
668 }
669 if (be_verbose) printf("%s: scanning dir\n", path);
670
671 pathlen = strlen(path);
672 while ((dentry = readdir(dir))) {
673 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
674 continue;
675 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
676 if (len >= sizeof(buf)) {
677 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path, len, sizeof(buf));
678 continue;
679 }
680 sprintf(buf, "%s/%s", path, dentry->d_name);
681 if (lstat(buf, &st) != -1) {
682 if (S_ISREG(st.st_mode))
683 scanelf_file(buf);
684 else if (dir_recurse && S_ISDIR(st.st_mode)) {
685 if (dir_crossmount || (st_top.st_dev == st.st_dev))
686 scanelf_dir(buf);
687 }
688 }
689 }
690 closedir(dir);
691 }
692
693 static int scanelf_from_file(char *filename)
694 {
695 FILE *fp = NULL;
696 char *p;
697 char path[_POSIX_PATH_MAX];
698
699 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
700 fp = stdin;
701 else if ((fp = fopen(filename, "r")) == NULL)
702 return 1;
703
704 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
705 if ((p = strchr(path, '\n')) != NULL)
706 *p = 0;
707 search_path = path;
708 scanelf_dir(path);
709 }
710 if (fp != stdin)
711 fclose(fp);
712 return 0;
713 }
714
715 static void load_ld_so_conf()
716 {
717 FILE *fp = NULL;
718 char *p;
719 char path[_POSIX_PATH_MAX];
720 int i = 0;
721
722 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
723 return;
724
725 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
726 if (*path != '/')
727 continue;
728
729 if ((p = strrchr(path, '\r')) != NULL)
730 *p = 0;
731 if ((p = strchr(path, '\n')) != NULL)
732 *p = 0;
733
734 ldpaths[i++] = xstrdup(path);
735
736 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
737 break;
738 }
739 ldpaths[i] = NULL;
740
741 fclose(fp);
742 }
743
744 /* scan /etc/ld.so.conf for paths */
745 static void scanelf_ldpath()
746 {
747 char scan_l, scan_ul, scan_ull;
748 int i = 0;
749
750 if (!ldpaths[0])
751 err("Unable to load any paths from ld.so.conf");
752
753 scan_l = scan_ul = scan_ull = 0;
754
755 while (ldpaths[i]) {
756 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
757 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
758 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
759 scanelf_dir(ldpaths[i]);
760 ++i;
761 }
762
763 if (!scan_l) scanelf_dir("/lib");
764 if (!scan_ul) scanelf_dir("/usr/lib");
765 if (!scan_ull) scanelf_dir("/usr/local/lib");
766 }
767
768 /* scan env PATH for paths */
769 static void scanelf_envpath()
770 {
771 char *path, *p;
772
773 path = getenv("PATH");
774 if (!path)
775 err("PATH is not set in your env !");
776 path = xstrdup(path);
777
778 while ((p = strrchr(path, ':')) != NULL) {
779 scanelf_dir(p + 1);
780 *p = 0;
781 }
782
783 free(path);
784 }
785
786
787
788 /* usage / invocation handling functions */
789 #define PARSE_FLAGS "plRmyxetrnibs:N:aqvF:f:o:BhV"
790 #define a_argument required_argument
791 static struct option const long_opts[] = {
792 {"path", no_argument, NULL, 'p'},
793 {"ldpath", no_argument, NULL, 'l'},
794 {"recursive", no_argument, NULL, 'R'},
795 {"mount", no_argument, NULL, 'm'},
796 {"symlink", no_argument, NULL, 'y'},
797 {"pax", no_argument, NULL, 'x'},
798 {"header", no_argument, NULL, 'e'},
799 {"textrel", no_argument, NULL, 't'},
800 {"rpath", no_argument, NULL, 'r'},
801 {"needed", no_argument, NULL, 'n'},
802 {"interp", no_argument, NULL, 'i'},
803 {"bind", no_argument, NULL, 'b'},
804 {"symbol", a_argument, NULL, 's'},
805 {"lib", a_argument, NULL, 'N'},
806 {"all", no_argument, NULL, 'a'},
807 {"quiet", no_argument, NULL, 'q'},
808 {"verbose", no_argument, NULL, 'v'},
809 {"format", a_argument, NULL, 'F'},
810 {"from", a_argument, NULL, 'f'},
811 {"file", a_argument, NULL, 'o'},
812 {"nobanner", no_argument, NULL, 'B'},
813 {"help", no_argument, NULL, 'h'},
814 {"version", no_argument, NULL, 'V'},
815 {NULL, no_argument, NULL, 0x0}
816 };
817
818 static const char *opts_help[] = {
819 "Scan all directories in PATH environment",
820 "Scan all directories in /etc/ld.so.conf",
821 "Scan directories recursively",
822 "Don't recursively cross mount points",
823 "Don't scan symlinks\n",
824 "Print PaX markings",
825 "Print GNU_STACK/PT_LOAD markings",
826 "Print TEXTREL information",
827 "Print RPATH information",
828 "Print NEEDED information",
829 "Print INTERP information",
830 "Print BIND information",
831 "Find a specified symbol",
832 "Find a specified library",
833 "Print all scanned info (-x -e -t -r -n -i -b)\n",
834 "Only output 'bad' things",
835 "Be verbose (can be specified more than once)",
836 "Use specified format for output",
837 "Read input stream from a filename",
838 "Write output stream to a filename",
839 "Don't display the header",
840 "Print this help and exit",
841 "Print version and exit",
842 NULL
843 };
844
845 /* display usage and exit */
846 static void usage(int status)
847 {
848 unsigned long i;
849 printf("* Scan ELF binaries for stuff\n\n"
850 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
851 printf("Options: -[%s]\n", PARSE_FLAGS);
852 for (i = 0; long_opts[i].name; ++i)
853 if (long_opts[i].has_arg == no_argument)
854 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
855 long_opts[i].name, opts_help[i]);
856 else
857 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
858 long_opts[i].name, opts_help[i]);
859
860 if (status != EXIT_SUCCESS)
861 exit(status);
862
863 puts("\nThe format modifiers for the -F option are:");
864 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
865 puts(" t TEXTREL \tr RPATH \tn NEEDED");
866 puts(" i INTERP \tb BIND \ts symbol");
867 puts(" N library \to Type");
868 puts(" p filename (with search path removed)");
869 puts(" f base filename");
870 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
871
872 exit(status);
873 }
874
875 /* parse command line arguments and preform needed actions */
876 static void parseargs(int argc, char *argv[])
877 {
878 int i;
879 char *from_file = NULL;
880
881 opterr = 0;
882 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
883 switch (i) {
884
885 case 'V':
886 printf("%s compiled %s\n%s\n"
887 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
888 __FILE__, __DATE__, rcsid, argv0);
889 exit(EXIT_SUCCESS);
890 break;
891 case 'h': usage(EXIT_SUCCESS); break;
892 case 'f':
893 if (from_file) err("Don't specify -f twice");
894 from_file = xstrdup(optarg);
895 break;
896 case 'o': {
897 FILE *fp = NULL;
898 if ((fp = freopen(optarg, "w", stdout)) == NULL)
899 err("Could not open output stream '%s': %s", optarg, strerror(errno));
900 SET_STDOUT(fp);
901 break;
902 }
903
904 case 's': {
905 size_t len;
906 if (find_sym) err("Don't specify -s twice");
907 find_sym = xstrdup(optarg);
908 len = strlen(find_sym) + 1;
909 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
910 sprintf(versioned_symname, "%s@", find_sym);
911 break;
912 }
913 case 'N': {
914 if (find_lib) err("Don't specify -N twice");
915 find_lib = xstrdup(optarg);
916 break;
917 }
918
919 case 'F': {
920 if (out_format) err("Don't specify -F twice");
921 out_format = xstrdup(optarg);
922 break;
923 }
924
925 case 'y': scan_symlink = 0; break;
926 case 'B': show_banner = 0; break;
927 case 'l': scan_ldpath = 1; break;
928 case 'p': scan_envpath = 1; break;
929 case 'R': dir_recurse = 1; break;
930 case 'm': dir_crossmount = 0; break;
931 case 'x': show_pax = 1; break;
932 case 'e': show_phdr = 1; break;
933 case 't': show_textrel = 1; break;
934 case 'r': show_rpath = 1; break;
935 case 'n': show_needed = 1; break;
936 case 'i': show_interp = 1; break;
937 case 'b': show_bind = 1; break;
938 case 'q': be_quiet = 1; break;
939 case 'v': be_verbose = (be_verbose % 20) + 1; break;
940 case 'a': show_pax = show_phdr = show_textrel = show_rpath = \
941 show_needed = show_interp = show_bind = 1; break;
942
943 case ':':
944 err("Option missing parameter\n");
945 case '?':
946 err("Unknown option\n");
947 default:
948 err("Unhandled option '%c'", i);
949 }
950 }
951
952 /* let the format option override all other options */
953 if (out_format) {
954 show_pax = show_phdr = show_textrel = show_rpath = \
955 show_needed = show_interp = show_bind = 0;
956 for (i = 0; out_format[i]; ++i) {
957 if (!IS_MODIFIER(out_format[i])) continue;
958
959 switch (out_format[++i]) {
960 case '%': break;
961 case '#': break;
962 case 'F': break;
963 case 'p': break;
964 case 'f': break;
965 case 's': break;
966 case 'N': break;
967 case 'o': break;
968 case 'x': show_pax = 1; break;
969 case 'e': show_phdr = 1; break;
970 case 't': show_textrel = 1; break;
971 case 'r': show_rpath = 1; break;
972 case 'n': show_needed = 1; break;
973 case 'i': show_interp = 1; break;
974 case 'b': show_bind = 1; break;
975 default:
976 err("Invalid format specifier '%c' (byte %i)",
977 out_format[i], i+1);
978 }
979 }
980
981 /* construct our default format */
982 } else {
983 size_t fmt_len = 30;
984 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
985 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
986 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
987 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
988 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
989 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
990 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
991 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
992 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
993 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
994 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
995 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
996 }
997 if (be_verbose > 2) printf("Format: %s\n", out_format);
998
999 /* now lets actually do the scanning */
1000 if (scan_ldpath || (show_rpath && be_quiet))
1001 load_ld_so_conf();
1002 if (scan_ldpath) scanelf_ldpath();
1003 if (scan_envpath) scanelf_envpath();
1004 if (from_file) {
1005 scanelf_from_file(from_file);
1006 free(from_file);
1007 from_file = *argv;
1008 }
1009 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1010 err("Nothing to scan !?");
1011 while (optind < argc) {
1012 search_path = argv[optind++];
1013 scanelf_dir(search_path);
1014 }
1015
1016 /* clean up */
1017 if (find_sym) {
1018 free(find_sym);
1019 free(versioned_symname);
1020 }
1021 if (find_lib) free(find_lib);
1022 if (out_format) free(out_format);
1023 for (i = 0; ldpaths[i]; ++i)
1024 free(ldpaths[i]);
1025 }
1026
1027
1028
1029 /* utility funcs */
1030 static char *xstrdup(const char *s)
1031 {
1032 char *ret = strdup(s);
1033 if (!ret) err("Could not strdup(): %s", strerror(errno));
1034 return ret;
1035 }
1036
1037 static void *xmalloc(size_t size)
1038 {
1039 void *ret = malloc(size);
1040 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1041 return ret;
1042 }
1043
1044 static void xstrcat(char **dst, const char *src, size_t *curr_len)
1045 {
1046 size_t new_len;
1047
1048 new_len = strlen(*dst) + strlen(src);
1049 if (*curr_len <= new_len) {
1050 *curr_len = new_len + (*curr_len / 2);
1051 *dst = realloc(*dst, *curr_len);
1052 if (!*dst)
1053 err("could not realloc %li bytes", (unsigned long)*curr_len);
1054 }
1055
1056 strcat(*dst, src);
1057 }
1058
1059 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1060 {
1061 static char my_app[2];
1062 my_app[0] = append;
1063 my_app[1] = '\0';
1064 xstrcat(dst, my_app, curr_len);
1065 }
1066
1067
1068
1069 int main(int argc, char *argv[])
1070 {
1071 if (argc < 2)
1072 usage(EXIT_FAILURE);
1073 parseargs(argc, argv);
1074 fclose(stdout);
1075 #ifdef __BOUNDS_CHECKING_ON
1076 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1077 #endif
1078 return EXIT_SUCCESS;
1079 }

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