/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.66 - (show annotations) (download) (as text)
Wed Jun 1 22:37:38 2005 UTC (9 years, 3 months ago) by vapier
Branch: MAIN
Changes since 1.65: +36 -6 lines
File MIME type: text/x-csrc
add support for mangling of the matched filename (%p->strip search path %f->just basename)

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 1.65 2005/05/30 03:23:07 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 1.65 2005/05/30 03:23:07 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(const 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
55 /* variables to control behavior */
56 static char *ldpaths[256];
57 static char scan_ldpath = 0;
58 static char scan_envpath = 0;
59 static char scan_symlink = 1;
60 static char dir_recurse = 0;
61 static char dir_crossmount = 1;
62 static char show_pax = 0;
63 static char show_stack = 0;
64 static char show_textrel = 0;
65 static char show_rpath = 0;
66 static char show_needed = 0;
67 static char show_interp = 0;
68 static char show_bind = 0;
69 static char show_banner = 1;
70 static char be_quiet = 0;
71 static char be_verbose = 0;
72 static char *find_sym = NULL, *versioned_symname = NULL;
73 static char *out_format = NULL;
74 static char *search_path = NULL;
75
76
77 /* sub-funcs for scanelf_file() */
78 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
79 {
80 static char *paxflags;
81 static char ret[7];
82 unsigned long i, shown;
83
84
85 if (!show_pax) return NULL;
86
87 shown = 0;
88 memset(&ret, 0, sizeof(ret));
89
90 if (elf->phdr) {
91 #define SHOW_PAX(B) \
92 if (elf->elf_class == ELFCLASS ## B) { \
93 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
94 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
95 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
96 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
97 continue; \
98 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
99 continue; \
100 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
101 *found_pax = 1; \
102 ++shown; \
103 break; \
104 } \
105 }
106 SHOW_PAX(32)
107 SHOW_PAX(64)
108 }
109
110 /* fall back to EI_PAX if no PT_PAX was found */
111 if (!*ret) {
112 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
113 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
114 *found_pax = 1;
115 return paxflags;
116 }
117 strncpy(ret, paxflags, sizeof(ret));
118 // ++shown;
119 }
120
121 if (be_quiet && !shown)
122 return NULL;
123 return ret;
124
125 }
126 static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
127 {
128 static char ret[8] = "--- ---";
129 char *found;
130 unsigned long i, off, shown;
131
132 if (!show_stack) return NULL;
133
134 shown = 0;
135
136 if (elf->phdr) {
137 #define SHOW_STACK(B) \
138 if (elf->elf_class == ELFCLASS ## B) { \
139 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
140 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
141 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
142 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
143 found = found_stack; \
144 off = 0; \
145 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
146 found = found_relro; \
147 off = 4; \
148 } else \
149 continue; \
150 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
151 continue; \
152 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
153 *found = 1; \
154 ++shown; \
155 } \
156 }
157 SHOW_STACK(32)
158 SHOW_STACK(64)
159 }
160
161 if (be_quiet && !shown)
162 return NULL;
163 else
164 return ret;
165 }
166 static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
167 {
168 static char *ret = "TEXTREL";
169 unsigned long i;
170
171 if (!show_textrel) return NULL;
172
173 if (elf->phdr) {
174 #define SHOW_TEXTREL(B) \
175 if (elf->elf_class == ELFCLASS ## B) { \
176 Elf ## B ## _Dyn *dyn; \
177 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
178 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
179 Elf ## B ## _Off offset; \
180 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
181 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
182 offset = EGET(phdr[i].p_offset); \
183 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
184 dyn = DYN ## B (elf->data + offset); \
185 while (EGET(dyn->d_tag) != DT_NULL) { \
186 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
187 *found_textrel = 1; \
188 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
189 return ret; \
190 } \
191 ++dyn; \
192 } \
193 } }
194 SHOW_TEXTREL(32)
195 SHOW_TEXTREL(64)
196 }
197
198 if (be_quiet)
199 return NULL;
200 else
201 return " - ";
202 }
203 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
204 {
205 /* TODO: when checking RPATH entries, check each subpath (between :) in ld.so.conf */
206 unsigned long i, s;
207 char *rpath, *runpath, **r;
208 void *strtbl_void;
209
210 if (!show_rpath) return;
211
212 strtbl_void = elf_findsecbyname(elf, ".dynstr");
213 rpath = runpath = NULL;
214
215 if (elf->phdr && strtbl_void) {
216 #define SHOW_RPATH(B) \
217 if (elf->elf_class == ELFCLASS ## B) { \
218 Elf ## B ## _Dyn *dyn; \
219 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
220 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
221 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
222 Elf ## B ## _Off offset; \
223 Elf ## B ## _Xword word; \
224 /* Scan all the program headers */ \
225 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
226 /* Just scan dynamic headers */ \
227 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
228 offset = EGET(phdr[i].p_offset); \
229 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
230 /* Just scan dynamic RPATH/RUNPATH headers */ \
231 dyn = DYN ## B (elf->data + offset); \
232 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
233 if (word == DT_RPATH) { \
234 r = &rpath; \
235 } else if (word == DT_RUNPATH) { \
236 r = &runpath; \
237 } else { \
238 ++dyn; \
239 continue; \
240 } \
241 /* Verify the memory is somewhat sane */ \
242 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
243 if (offset < elf->len) { \
244 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
245 *r = (char*)(elf->data + offset); \
246 /* If quiet, don't output paths in ld.so.conf */ \
247 if (be_quiet) \
248 for (s = 0; ldpaths[s]; ++s) \
249 if (!strcmp(ldpaths[s], *r)) { \
250 *r = NULL; \
251 break; \
252 } \
253 if (*r) *found_rpath = 1; \
254 } \
255 ++dyn; \
256 } \
257 } }
258 SHOW_RPATH(32)
259 SHOW_RPATH(64)
260 }
261
262 if (rpath && runpath) {
263 if (!strcmp(rpath, runpath)) {
264 xstrcat(ret, runpath, ret_len);
265 } else {
266 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
267 xchrcat(ret, '{', ret_len);
268 xstrcat(ret, rpath, ret_len);
269 xchrcat(ret, ',', ret_len);
270 xstrcat(ret, runpath, ret_len);
271 xchrcat(ret, '}', ret_len);
272 }
273 } else if (rpath || runpath)
274 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
275 else if (!be_quiet)
276 xstrcat(ret, " - ", ret_len);
277 }
278 static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
279 {
280 unsigned long i;
281 char *needed;
282 void *strtbl_void;
283
284 if (!show_needed) return;
285
286 strtbl_void = elf_findsecbyname(elf, ".dynstr");
287
288 if (elf->phdr && strtbl_void) {
289 #define SHOW_NEEDED(B) \
290 if (elf->elf_class == ELFCLASS ## B) { \
291 Elf ## B ## _Dyn *dyn; \
292 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
293 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
294 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
295 Elf ## B ## _Off offset; \
296 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
297 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
298 offset = EGET(phdr[i].p_offset); \
299 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
300 dyn = DYN ## B (elf->data + offset); \
301 while (EGET(dyn->d_tag) != DT_NULL) { \
302 if (EGET(dyn->d_tag) == DT_NEEDED) { \
303 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
304 if (offset >= elf->len) { \
305 ++dyn; \
306 continue; \
307 } \
308 needed = (char*)(elf->data + offset); \
309 if (*found_needed) xchrcat(ret, ',', ret_len); \
310 xstrcat(ret, needed, ret_len); \
311 *found_needed = 1; \
312 } \
313 ++dyn; \
314 } \
315 } }
316 SHOW_NEEDED(32)
317 SHOW_NEEDED(64)
318 }
319 }
320 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
321 {
322 void *strtbl_void;
323
324 if (!show_interp) return NULL;
325
326 strtbl_void = elf_findsecbyname(elf, ".interp");
327
328 if (strtbl_void) {
329 #define SHOW_INTERP(B) \
330 if (elf->elf_class == ELFCLASS ## B) { \
331 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
332 *found_interp = 1; \
333 return elf->data + EGET(strtbl->sh_offset); \
334 }
335 SHOW_INTERP(32)
336 SHOW_INTERP(64)
337 }
338 return NULL;
339 }
340 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
341 {
342 unsigned long i;
343 struct stat s;
344
345 if (!show_bind) return NULL;
346 if (!elf->phdr) return NULL;
347
348 #define SHOW_BIND(B) \
349 if (elf->elf_class == ELFCLASS ## B) { \
350 Elf ## B ## _Dyn *dyn; \
351 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
352 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
353 Elf ## B ## _Off offset; \
354 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
355 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
356 offset = EGET(phdr[i].p_offset); \
357 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
358 dyn = DYN ## B (elf->data + offset); \
359 while (EGET(dyn->d_tag) != DT_NULL) { \
360 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
361 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
362 { \
363 if (be_quiet) return NULL; \
364 *found_bind = 1; \
365 return "NOW"; \
366 } \
367 ++dyn; \
368 } \
369 } \
370 }
371 SHOW_BIND(32)
372 SHOW_BIND(64)
373
374 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
375 return NULL;
376 } else {
377 *found_bind = 1;
378 return "LAZY";
379 }
380 }
381 static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
382 {
383 unsigned long i;
384 void *symtab_void, *strtab_void;
385
386 if (!find_sym) return NULL;
387
388 symtab_void = elf_findsecbyname(elf, ".symtab");
389 strtab_void = elf_findsecbyname(elf, ".strtab");
390
391 if (symtab_void && strtab_void) {
392 char *base, *basemem;
393 basemem = xstrdup(filename);
394 base = basename(basemem);
395 #define FIND_SYM(B) \
396 if (elf->elf_class == ELFCLASS ## B) { \
397 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
398 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
399 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
400 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
401 char *symname; \
402 for (i = 0; i < cnt; ++i) { \
403 if (sym->st_name) { \
404 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
405 if (*find_sym == '*') { \
406 printf("%s(%s) %5lX %15s %s\n", \
407 ((*found_sym == 0) ? "\n\t" : "\t"), \
408 base, \
409 (long)sym->st_size, \
410 (char *)get_elfstttype(sym->st_info), \
411 symname); \
412 *found_sym = 1; \
413 } else if ((strcmp(find_sym, symname) == 0) || \
414 (strcmp(symname, versioned_symname) == 0)) \
415 (*found_sym)++; \
416 } \
417 ++sym; \
418 } }
419 FIND_SYM(32)
420 FIND_SYM(64)
421 free(basemem);
422 }
423 if (*find_sym != '*' && *found_sym)
424 return find_sym;
425 if (be_quiet)
426 return NULL;
427 else
428 return " - ";
429 }
430 /* scan an elf file and show all the fun stuff */
431 // #define prints(str) fputs(str, stdout)
432 #define prints(str) write(fileno(stdout), str, strlen(str))
433 static void scanelf_file(const char *filename)
434 {
435 unsigned long i;
436 char found_pax, found_stack, found_relro, found_textrel,
437 found_rpath, found_needed, found_interp, found_bind,
438 found_sym, found_file;
439 elfobj *elf;
440 struct stat st;
441 static char *out_buffer = NULL;
442 static size_t out_len;
443
444 /* make sure 'filename' exists */
445 if (lstat(filename, &st) == -1) {
446 if (be_verbose > 2) printf("%s: does not exist\n", filename);
447 return;
448 }
449 /* always handle regular files and handle symlinked files if no -y */
450 if (S_ISLNK(st.st_mode)) {
451 if (!scan_symlink) return;
452 stat(filename, &st);
453 }
454 if (!S_ISREG(st.st_mode)) {
455 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
456 return;
457 }
458
459 found_pax = found_stack = found_relro = found_textrel = \
460 found_rpath = found_needed = found_interp = found_bind = \
461 found_sym = found_file = 0;
462
463 /* verify this is real ELF */
464 if ((elf = readelf(filename)) == NULL) {
465 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
466 return;
467 }
468
469 if (be_verbose > 1)
470 printf("%s: scanning file {%s,%s}\n", filename,
471 get_elfeitype(elf, EI_CLASS, elf->elf_class),
472 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
473 else if (be_verbose)
474 printf("%s: scanning file\n", filename);
475
476 /* init output buffer */
477 if (!out_buffer) {
478 out_len = sizeof(char) * 80;
479 out_buffer = (char*)xmalloc(out_len);
480 }
481 *out_buffer = '\0';
482
483 /* show the header */
484 if (!be_quiet && show_banner) {
485 for (i = 0; out_format[i]; ++i) {
486 if (out_format[i] != '%') continue;
487
488 switch (out_format[++i]) {
489 case '%': break;
490 case 'F':
491 case 'p':
492 case 'f': prints("FILE "); found_file = 1; break;
493 case 'o': prints(" TYPE "); break;
494 case 'x': prints(" PAX "); break;
495 case 'e': prints("STK/REL "); break;
496 case 't': prints("TEXTREL "); break;
497 case 'r': prints("RPATH "); break;
498 case 'n': prints("NEEDED "); break;
499 case 'i': prints("INTERP "); break;
500 case 'b': prints("BIND "); break;
501 case 's': prints("SYM "); break;
502 }
503 }
504 if (!found_file) prints("FILE ");
505 prints("\n");
506 found_file = 0;
507 show_banner = 0;
508 }
509
510 /* dump all the good stuff */
511 for (i = 0; out_format[i]; ++i) {
512 const char *out;
513 const char *tmp;
514
515 /* make sure we trim leading spaces in quiet mode */
516 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
517 *out_buffer = '\0';
518
519 if (out_format[i] != '%') {
520 xchrcat(&out_buffer, out_format[i], &out_len);
521 continue;
522 }
523
524 out = NULL;
525 switch (out_format[++i]) {
526 case '%': xchrcat(&out_buffer, '%', &out_len); break;
527 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
528 case 'p':
529 found_file = 1;
530 tmp = filename;
531 if (search_path) {
532 ssize_t len_search = strlen(search_path);
533 ssize_t len_file = strlen(filename);
534 if (!strncmp(filename, search_path, len_search) && \
535 len_file > len_search)
536 tmp += len_search;
537 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
538 }
539 xstrcat(&out_buffer, tmp, &out_len);
540 break;
541 case 'f':
542 found_file = 1;
543 tmp = strrchr(filename, '/');
544 tmp = (tmp == NULL ? filename : tmp+1);
545 xstrcat(&out_buffer, tmp, &out_len);
546 break;
547 case 'o': out = get_elfetype(elf); break;
548 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
549 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
550 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
551 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
552 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
553 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
554 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
555 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
556 }
557 if (out) xstrcat(&out_buffer, out, &out_len);
558 }
559
560 #define FOUND_SOMETHING() \
561 (found_pax || found_stack || found_textrel || found_rpath || \
562 found_needed || found_interp || found_bind || found_sym)
563
564 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
565 xchrcat(&out_buffer, ' ', &out_len);
566 xstrcat(&out_buffer, filename, &out_len);
567 }
568 if (!be_quiet || (be_quiet && FOUND_SOMETHING()))
569 puts(out_buffer);
570
571 unreadelf(elf);
572 }
573
574 /* scan a directory for ET_EXEC files and print when we find one */
575 static void scanelf_dir(const char *path)
576 {
577 register DIR *dir;
578 register struct dirent *dentry;
579 struct stat st_top, st;
580 char buf[_POSIX_PATH_MAX];
581 size_t pathlen = 0, len = 0;
582
583 /* make sure path exists */
584 if (lstat(path, &st_top) == -1) {
585 if (be_verbose > 2) printf("%s: does not exist\n", path);
586 return;
587 }
588
589 /* ok, if it isn't a directory, assume we can open it */
590 if (!S_ISDIR(st_top.st_mode)) {
591 scanelf_file(path);
592 return;
593 }
594
595 /* now scan the dir looking for fun stuff */
596 if ((dir = opendir(path)) == NULL) {
597 warnf("could not opendir %s: %s", path, strerror(errno));
598 return;
599 }
600 if (be_verbose) printf("%s: scanning dir\n", path);
601
602 pathlen = strlen(path);
603 while ((dentry = readdir(dir))) {
604 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
605 continue;
606 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
607 if (len >= sizeof(buf)) {
608 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
609 continue;
610 }
611 sprintf(buf, "%s/%s", path, dentry->d_name);
612 if (lstat(buf, &st) != -1) {
613 if (S_ISREG(st.st_mode))
614 scanelf_file(buf);
615 else if (dir_recurse && S_ISDIR(st.st_mode)) {
616 if (dir_crossmount || (st_top.st_dev == st.st_dev))
617 scanelf_dir(buf);
618 }
619 }
620 }
621 closedir(dir);
622 }
623
624 static int scanelf_from_file(char *filename)
625 {
626 FILE *fp = NULL;
627 char *p;
628 char path[_POSIX_PATH_MAX];
629
630 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
631 fp = stdin;
632 else if ((fp = fopen(filename, "r")) == NULL)
633 return 1;
634
635 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
636 if ((p = strchr(path, '\n')) != NULL)
637 *p = 0;
638 search_path = path;
639 scanelf_dir(path);
640 }
641 if (fp != stdin)
642 fclose(fp);
643 return 0;
644 }
645
646 static void load_ld_so_conf()
647 {
648 FILE *fp = NULL;
649 char *p;
650 char path[_POSIX_PATH_MAX];
651 int i = 0;
652
653 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
654 return;
655
656 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
657 if (*path != '/')
658 continue;
659
660 if ((p = strrchr(path, '\r')) != NULL)
661 *p = 0;
662 if ((p = strchr(path, '\n')) != NULL)
663 *p = 0;
664
665 ldpaths[i++] = xstrdup(path);
666
667 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
668 break;
669 }
670 ldpaths[i] = NULL;
671
672 fclose(fp);
673 }
674
675 /* scan /etc/ld.so.conf for paths */
676 static void scanelf_ldpath()
677 {
678 char scan_l, scan_ul, scan_ull;
679 int i = 0;
680
681 if (!ldpaths[0])
682 err("Unable to load any paths from ld.so.conf");
683
684 scan_l = scan_ul = scan_ull = 0;
685
686 while (ldpaths[i]) {
687 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
688 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
689 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
690 scanelf_dir(ldpaths[i]);
691 ++i;
692 }
693
694 if (!scan_l) scanelf_dir("/lib");
695 if (!scan_ul) scanelf_dir("/usr/lib");
696 if (!scan_ull) scanelf_dir("/usr/local/lib");
697 }
698
699 /* scan env PATH for paths */
700 static void scanelf_envpath()
701 {
702 char *path, *p;
703
704 path = getenv("PATH");
705 if (!path)
706 err("PATH is not set in your env !");
707 path = xstrdup(path);
708
709 while ((p = strrchr(path, ':')) != NULL) {
710 scanelf_dir(p + 1);
711 *p = 0;
712 }
713
714 free(path);
715 }
716
717
718
719 /* usage / invocation handling functions */
720 #define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV"
721 #define a_argument required_argument
722 static struct option const long_opts[] = {
723 {"path", no_argument, NULL, 'p'},
724 {"ldpath", no_argument, NULL, 'l'},
725 {"recursive", no_argument, NULL, 'R'},
726 {"mount", no_argument, NULL, 'm'},
727 {"symlink", no_argument, NULL, 'y'},
728 {"pax", no_argument, NULL, 'x'},
729 {"header", no_argument, NULL, 'e'},
730 {"textrel", no_argument, NULL, 't'},
731 {"rpath", no_argument, NULL, 'r'},
732 {"needed", no_argument, NULL, 'n'},
733 {"interp", no_argument, NULL, 'i'},
734 {"bind", no_argument, NULL, 'b'},
735 {"symbol", a_argument, NULL, 's'},
736 {"all", no_argument, NULL, 'a'},
737 {"quiet", no_argument, NULL, 'q'},
738 {"verbose", no_argument, NULL, 'v'},
739 {"format", a_argument, NULL, 'F'},
740 {"from", a_argument, NULL, 'f'},
741 {"file", a_argument, NULL, 'o'},
742 {"nobanner", no_argument, NULL, 'B'},
743 {"help", no_argument, NULL, 'h'},
744 {"version", no_argument, NULL, 'V'},
745 {NULL, no_argument, NULL, 0x0}
746 };
747
748 static char *opts_help[] = {
749 "Scan all directories in PATH environment",
750 "Scan all directories in /etc/ld.so.conf",
751 "Scan directories recursively",
752 "Don't recursively cross mount points",
753 "Don't scan symlinks\n",
754 "Print PaX markings",
755 "Print GNU_STACK markings",
756 "Print TEXTREL information",
757 "Print RPATH information",
758 "Print NEEDED information",
759 "Print INTERP information",
760 "Print BIND information",
761 "Find a specified symbol",
762 "Print all scanned info (-x -e -t -r -n -i -b)\n",
763 "Only output 'bad' things",
764 "Be verbose (can be specified more than once)",
765 "Use specified format for output",
766 "Read input stream from a filename",
767 "Write output stream to a filename",
768 "Don't display the header",
769 "Print this help and exit",
770 "Print version and exit",
771 NULL
772 };
773
774 /* display usage and exit */
775 static void usage(int status)
776 {
777 unsigned long i;
778 printf("* Scan ELF binaries for stuff\n\n"
779 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
780 printf("Options: -[%s]\n", PARSE_FLAGS);
781 for (i = 0; long_opts[i].name; ++i)
782 if (long_opts[i].has_arg == no_argument)
783 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
784 long_opts[i].name, opts_help[i]);
785 else
786 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
787 long_opts[i].name, opts_help[i]);
788
789 if (status != EXIT_SUCCESS)
790 exit(status);
791
792 puts("\nThe format modifiers for the -F option are:");
793 puts(" %F Filename \t%x PaX Flags \t%e STACK/RELRO");
794 puts(" %t TEXTREL \t%r RPATH \t%n NEEDED");
795 puts(" %i INTERP \t%b BIND \t%s symbol");
796 puts(" %p filename (with search path removed)");
797 puts(" %f base filename");
798
799 exit(status);
800 }
801
802 /* parse command line arguments and preform needed actions */
803 static void parseargs(int argc, char *argv[])
804 {
805 int i;
806 char *from_file = NULL;
807
808 opterr = 0;
809 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
810 switch (i) {
811
812 case 'V':
813 printf("%s compiled %s\n%s\n"
814 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
815 __FILE__, __DATE__, rcsid, argv0);
816 exit(EXIT_SUCCESS);
817 break;
818 case 'h': usage(EXIT_SUCCESS); break;
819 case 'f':
820 if (from_file) err("Don't specify -f twice");
821 from_file = xstrdup(optarg);
822 break;
823 case 'o': {
824 FILE *fp = NULL;
825 if ((fp = freopen(optarg, "w", stdout)) == NULL)
826 err("Could not open output stream '%s': %s", optarg, strerror(errno));
827 SET_STDOUT(fp);
828 break;
829 }
830
831 case 's': {
832 size_t len;
833 if (find_sym) err("Don't specify -s twice");
834 find_sym = xstrdup(optarg);
835 len = strlen(find_sym) + 1;
836 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
837 sprintf(versioned_symname, "%s@", find_sym);
838 break;
839 }
840
841 case 'F': {
842 if (out_format) err("Don't specify -F twice");
843 out_format = xstrdup(optarg);
844 break;
845 }
846
847 case 'y': scan_symlink = 0; break;
848 case 'B': show_banner = 0; break;
849 case 'l': scan_ldpath = 1; break;
850 case 'p': scan_envpath = 1; break;
851 case 'R': dir_recurse = 1; break;
852 case 'm': dir_crossmount = 0; break;
853 case 'x': show_pax = 1; break;
854 case 'e': show_stack = 1; break;
855 case 't': show_textrel = 1; break;
856 case 'r': show_rpath = 1; break;
857 case 'n': show_needed = 1; break;
858 case 'i': show_interp = 1; break;
859 case 'b': show_bind = 1; break;
860 case 'q': be_quiet = 1; break;
861 case 'v': be_verbose = (be_verbose % 20) + 1; break;
862 case 'a': show_pax = show_stack = show_textrel = show_rpath = \
863 show_needed = show_interp = show_bind = 1; break;
864
865 case ':':
866 err("Option missing parameter\n");
867 case '?':
868 err("Unknown option\n");
869 default:
870 err("Unhandled option '%c'", i);
871 }
872 }
873
874 /* let the format option override all other options */
875 if (out_format) {
876 show_pax = show_stack = show_textrel = show_rpath = \
877 show_needed = show_interp = show_bind = 0;
878 for (i = 0; out_format[i]; ++i) {
879 if (out_format[i] != '%') continue;
880
881 switch (out_format[++i]) {
882 case '%': break;
883 case 'F': break;
884 case 'p': break;
885 case 'f': break;
886 case 's': break;
887 case 'o': break;
888 case 'x': show_pax = 1; break;
889 case 'e': show_stack = 1; break;
890 case 't': show_textrel = 1; break;
891 case 'r': show_rpath = 1; break;
892 case 'n': show_needed = 1; break;
893 case 'i': show_interp = 1; break;
894 case 'b': show_bind = 1; break;
895 default:
896 err("Invalid format specifier '%c' (byte %i)",
897 out_format[i], i+1);
898 }
899 }
900
901 /* construct our default format */
902 } else {
903 size_t fmt_len = 30;
904 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
905 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
906 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
907 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
908 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
909 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
910 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
911 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
912 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
913 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
914 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
915 }
916 if (be_verbose > 2) printf("Format: %s\n", out_format);
917
918 /* now lets actually do the scanning */
919 if (scan_ldpath || (show_rpath && be_quiet))
920 load_ld_so_conf();
921 if (scan_ldpath) scanelf_ldpath();
922 if (scan_envpath) scanelf_envpath();
923 if (from_file) {
924 scanelf_from_file(from_file);
925 free(from_file);
926 from_file = *argv;
927 }
928 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
929 err("Nothing to scan !?");
930 while (optind < argc) {
931 search_path = argv[optind++];
932 scanelf_dir(search_path);
933 }
934
935 /* clean up */
936 if (find_sym) {
937 free(find_sym);
938 free(versioned_symname);
939 }
940 if (out_format) free(out_format);
941 for (i = 0; ldpaths[i]; ++i)
942 free(ldpaths[i]);
943 }
944
945
946
947 /* utility funcs */
948 static char *xstrdup(const char *s)
949 {
950 char *ret = strdup(s);
951 if (!ret) err("Could not strdup(): %s", strerror(errno));
952 return ret;
953 }
954
955 static void *xmalloc(size_t size)
956 {
957 void *ret = malloc(size);
958 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
959 return ret;
960 }
961
962 static void xstrcat(char **dst, const char *src, size_t *curr_len)
963 {
964 long new_len;
965
966 new_len = strlen(*dst) + strlen(src);
967 if (*curr_len <= new_len) {
968 *curr_len = new_len + (*curr_len / 2);
969 *dst = realloc(*dst, *curr_len);
970 if (!*dst)
971 err("could not realloc %li bytes", (unsigned long)*curr_len);
972 }
973
974 strcat(*dst, src);
975 }
976
977 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
978 {
979 static char my_app[2];
980 my_app[0] = append;
981 my_app[1] = '\0';
982 xstrcat(dst, my_app, curr_len);
983 }
984
985
986 int main(int argc, char *argv[])
987 {
988 if (argc < 2)
989 usage(EXIT_FAILURE);
990 parseargs(argc, argv);
991 fclose(stdout);
992 #ifdef __BOUNDS_CHECKING_ON
993 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
994 #endif
995 return EXIT_SUCCESS;
996 }

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