/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.56 - (show annotations) (download) (as text)
Sat May 21 00:34:07 2005 UTC (9 years, 4 months ago) by vapier
Branch: MAIN
Changes since 1.55: +3 -4 lines
File MIME type: text/x-csrc
only fstat when we need to

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 1.55 2005/05/19 22:17:11 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 1.55 2005/05/19 22:17:11 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
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
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
82 if (!show_pax) return NULL;
83
84 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
85 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
86 *found_pax = 1;
87 return paxflags;
88 }
89
90 return NULL;
91 }
92 static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
93 {
94 static char ret[8];
95 char *found;
96 unsigned long i, off, shown;
97
98 if (!show_stack) return NULL;
99
100 shown = 0;
101 strcpy(ret, "--- ---");
102
103 if (elf->phdr) {
104 #define SHOW_STACK(B) \
105 if (elf->elf_class == ELFCLASS ## B) { \
106 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
107 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
108 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
109 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
110 found = found_stack; \
111 off = 0; \
112 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
113 found = found_relro; \
114 off = 4; \
115 } else \
116 continue; \
117 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
118 continue; \
119 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
120 *found = 1; \
121 ++shown; \
122 } \
123 }
124 SHOW_STACK(32)
125 SHOW_STACK(64)
126 }
127
128 if (be_quiet && !shown)
129 return NULL;
130 else
131 return ret;
132 }
133 static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
134 {
135 static char *ret = "TEXTREL";
136 unsigned long i;
137
138 if (!show_textrel) return NULL;
139
140 if (elf->phdr) {
141 #define SHOW_TEXTREL(B) \
142 if (elf->elf_class == ELFCLASS ## B) { \
143 Elf ## B ## _Dyn *dyn; \
144 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
145 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
146 Elf ## B ## _Off offset; \
147 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
148 if (phdr[i].p_type != PT_DYNAMIC) continue; \
149 offset = EGET(phdr[i].p_offset); \
150 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
151 dyn = DYN ## B (elf->data + offset); \
152 while (EGET(dyn->d_tag) != DT_NULL) { \
153 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
154 *found_textrel = 1; \
155 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
156 return ret; \
157 } \
158 ++dyn; \
159 } \
160 } }
161 SHOW_TEXTREL(32)
162 SHOW_TEXTREL(64)
163 }
164
165 if (be_quiet)
166 return NULL;
167 else
168 return " - ";
169 }
170 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
171 {
172 /* TODO: when checking RPATH entries, check each subpath (between :) in ld.so.conf */
173 unsigned long i, s;
174 char *rpath, *runpath, **r;
175 void *strtbl_void;
176
177 if (!show_rpath) return;
178
179 strtbl_void = elf_findsecbyname(elf, ".dynstr");
180 rpath = runpath = NULL;
181
182 if (elf->phdr && strtbl_void) {
183 #define SHOW_RPATH(B) \
184 if (elf->elf_class == ELFCLASS ## B) { \
185 Elf ## B ## _Dyn *dyn; \
186 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
187 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
188 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
189 Elf ## B ## _Off offset; \
190 Elf ## B ## _Sxword word; \
191 /* Scan all the program headers */ \
192 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
193 /* Just scan dynamic headers */ \
194 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
195 offset = EGET(phdr[i].p_offset); \
196 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
197 /* Just scan dynamic RPATH/RUNPATH headers */ \
198 dyn = DYN ## B (elf->data + offset); \
199 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
200 if (word == DT_RPATH) { \
201 r = &rpath; \
202 } else if (word == DT_RUNPATH) { \
203 r = &runpath; \
204 } else { \
205 ++dyn; \
206 continue; \
207 } \
208 /* Verify the memory is somewhat sane */ \
209 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
210 if (offset < elf->len) { \
211 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
212 *r = (char*)(elf->data + offset); \
213 /* If quiet, don't output paths in ld.so.conf */ \
214 if (be_quiet) \
215 for (s = 0; ldpaths[s]; ++s) \
216 if (!strcmp(ldpaths[s], *r)) { \
217 *r = NULL; \
218 break; \
219 } \
220 if (*r) *found_rpath = 1; \
221 } \
222 ++dyn; \
223 } \
224 } }
225 SHOW_RPATH(32)
226 SHOW_RPATH(64)
227 }
228
229 if (rpath && runpath) {
230 if (!strcmp(rpath, runpath)) {
231 xstrcat(ret, runpath, ret_len);
232 } else {
233 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
234 xchrcat(ret, '{', ret_len);
235 xstrcat(ret, rpath, ret_len);
236 xchrcat(ret, ',', ret_len);
237 xstrcat(ret, runpath, ret_len);
238 xchrcat(ret, '}', ret_len);
239 }
240 } else if (rpath || runpath)
241 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
242 else if (!be_quiet)
243 xstrcat(ret, " - ", ret_len);
244 }
245 static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
246 {
247 unsigned long i;
248 char *needed;
249 void *strtbl_void;
250
251 if (!show_needed) return;
252
253 strtbl_void = elf_findsecbyname(elf, ".dynstr");
254
255 if (elf->phdr && strtbl_void) {
256 #define SHOW_NEEDED(B) \
257 if (elf->elf_class == ELFCLASS ## B) { \
258 Elf ## B ## _Dyn *dyn; \
259 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
260 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
261 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
262 Elf ## B ## _Off offset; \
263 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
264 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
265 offset = EGET(phdr[i].p_offset); \
266 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
267 dyn = DYN ## B (elf->data + offset); \
268 while (EGET(dyn->d_tag) != DT_NULL) { \
269 if (EGET(dyn->d_tag) == DT_NEEDED) { \
270 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
271 if (offset >= elf->len) { \
272 ++dyn; \
273 continue; \
274 } \
275 needed = (char*)(elf->data + offset); \
276 if (*found_needed) xchrcat(ret, ',', ret_len); \
277 xstrcat(ret, needed, ret_len); \
278 *found_needed = 1; \
279 } \
280 ++dyn; \
281 } \
282 } }
283 SHOW_NEEDED(32)
284 SHOW_NEEDED(64)
285 }
286 }
287 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
288 {
289 void *strtbl_void;
290
291 if (!show_interp) return NULL;
292
293 strtbl_void = elf_findsecbyname(elf, ".interp");
294
295 if (strtbl_void) {
296 #define SHOW_INTERP(B) \
297 if (elf->elf_class == ELFCLASS ## B) { \
298 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
299 *found_interp = 1; \
300 return elf->data + EGET(strtbl->sh_offset); \
301 }
302 SHOW_INTERP(32)
303 SHOW_INTERP(64)
304 }
305 return NULL;
306 }
307 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
308 {
309 unsigned long i;
310 struct stat s;
311
312 if (!show_bind) return NULL;
313 if (!elf->phdr) 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 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
342 return NULL;
343 } else {
344 *found_bind = 1;
345 return "LAZY";
346 }
347 }
348 static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
349 {
350 unsigned long i;
351 void *symtab_void, *strtab_void;
352
353 if (!find_sym) return NULL;
354
355 symtab_void = elf_findsecbyname(elf, ".symtab");
356 strtab_void = elf_findsecbyname(elf, ".strtab");
357
358 if (symtab_void && strtab_void) {
359 #define FIND_SYM(B) \
360 if (elf->elf_class == ELFCLASS ## B) { \
361 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
362 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
363 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
364 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
365 char *symname; \
366 for (i = 0; i < cnt; ++i) { \
367 if (sym->st_name) { \
368 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
369 if (*find_sym == '*') { \
370 printf("%s(%s) %5lX %15s %s\n", \
371 ((*found_sym == 0) ? "\n\t" : "\t"), \
372 (char *)basename(filename), \
373 (long)sym->st_size, \
374 (char *)get_elfstttype(sym->st_info), \
375 symname); \
376 *found_sym = 1; \
377 } else if ((strcmp(find_sym, symname) == 0) || \
378 (strcmp(symname, versioned_symname) == 0)) \
379 (*found_sym)++; \
380 } \
381 ++sym; \
382 } }
383 FIND_SYM(32)
384 FIND_SYM(64)
385 }
386 if (*find_sym != '*' && *found_sym)
387 return find_sym;
388 if (be_quiet)
389 return NULL;
390 else
391 return " - ";
392 }
393 /* scan an elf file and show all the fun stuff */
394 #define prints(str) fputs(str, stdout)
395 static void scanelf_file(const char *filename)
396 {
397 unsigned long i;
398 char found_pax, found_stack, found_relro, found_textrel,
399 found_rpath, found_needed, found_interp, found_bind,
400 found_sym, found_file;
401 elfobj *elf;
402 struct stat st;
403 static char *out_buffer = NULL;
404 static size_t out_len;
405
406 /* make sure 'filename' exists */
407 if (lstat(filename, &st) == -1) {
408 if (be_verbose > 2) printf("%s: does not exist\n", filename);
409 return;
410 }
411 /* always handle regular files and handle symlinked files if no -y */
412 if (S_ISLNK(st.st_mode)) {
413 if (!scan_symlink) return;
414 stat(filename, &st);
415 }
416 if (!S_ISREG(st.st_mode)) {
417 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
418 return;
419 }
420
421 found_pax = found_stack = found_relro = found_textrel = \
422 found_rpath = found_needed = found_interp = found_bind = \
423 found_sym = found_file = 0;
424
425 /* verify this is real ELF */
426 if ((elf = readelf(filename)) == NULL) {
427 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
428 return;
429 }
430
431 if (be_verbose > 1)
432 printf("%s: scanning file {%s,%s}\n", filename,
433 get_elfeitype(elf, EI_CLASS, elf->elf_class),
434 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
435 else if (be_verbose)
436 printf("%s: scanning file\n", filename);
437
438 /* init output buffer */
439 if (!out_buffer) {
440 out_len = sizeof(char) * 80;
441 out_buffer = (char*)xmalloc(out_len);
442 }
443 *out_buffer = '\0';
444
445 /* show the header */
446 if (!be_quiet && show_banner) {
447 for (i = 0; out_format[i]; ++i) {
448 if (out_format[i] != '%') continue;
449
450 switch (out_format[++i]) {
451 case '%': break;
452 case 'F': prints("FILE "); found_file = 1; break;
453 case 'o': prints(" TYPE "); break;
454 case 'x': prints(" PAX "); break;
455 case 'e': prints("STK/REL "); break;
456 case 't': prints("TEXTREL "); break;
457 case 'r': prints("RPATH "); break;
458 case 'n': prints("NEEDED "); break;
459 case 'i': prints("INTERP "); break;
460 case 'b': prints("BIND "); break;
461 case 's': prints("SYM "); break;
462 }
463 }
464 if (!found_file) prints("FILE ");
465 prints("\n");
466 found_file = 0;
467 show_banner = 0;
468 }
469
470 /* dump all the good stuff */
471 for (i = 0; out_format[i]; ++i) {
472 const char *out;
473
474 /* make sure we trim leading spaces in quiet mode */
475 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
476 *out_buffer = '\0';
477
478 if (out_format[i] != '%') {
479 xchrcat(&out_buffer, out_format[i], &out_len);
480 continue;
481 }
482
483 out = NULL;
484 switch (out_format[++i]) {
485 case '%': xchrcat(&out_buffer, '%', &out_len); break;
486 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
487 case 'o': out = get_elfetype(elf); break;
488 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
489 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
490 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
491 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
492 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
493 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
494 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
495 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
496 }
497 if (out) xstrcat(&out_buffer, out, &out_len);
498 }
499
500 #define FOUND_SOMETHING() \
501 (found_pax || found_stack || found_textrel || found_rpath || \
502 found_needed || found_interp || found_bind || found_sym)
503
504 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
505 xchrcat(&out_buffer, ' ', &out_len);
506 xstrcat(&out_buffer, filename, &out_len);
507 }
508 if (!be_quiet || (be_quiet && FOUND_SOMETHING()))
509 puts(out_buffer);
510
511 unreadelf(elf);
512 }
513
514 /* scan a directory for ET_EXEC files and print when we find one */
515 static void scanelf_dir(const char *path)
516 {
517 register DIR *dir;
518 register struct dirent *dentry;
519 struct stat st_top, st;
520 char buf[_POSIX_PATH_MAX];
521 size_t pathlen = 0, len = 0;
522
523 /* make sure path exists */
524 if (lstat(path, &st_top) == -1) {
525 if (be_verbose > 2) printf("%s: does not exist\n", path);
526 return;
527 }
528
529 /* ok, if it isn't a directory, assume we can open it */
530 if (!S_ISDIR(st_top.st_mode)) {
531 scanelf_file(path);
532 return;
533 }
534
535 /* now scan the dir looking for fun stuff */
536 if ((dir = opendir(path)) == NULL) {
537 warnf("could not opendir %s: %s", path, strerror(errno));
538 return;
539 }
540 if (be_verbose) printf("%s: scanning dir\n", path);
541
542 pathlen = strlen(path);
543 while ((dentry = readdir(dir))) {
544 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
545 continue;
546 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
547 if (len >= sizeof(buf)) {
548 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
549 continue;
550 }
551 sprintf(buf, "%s/%s", path, dentry->d_name);
552 if (lstat(buf, &st) != -1) {
553 if (S_ISREG(st.st_mode))
554 scanelf_file(buf);
555 else if (dir_recurse && S_ISDIR(st.st_mode)) {
556 if (dir_crossmount || (st_top.st_dev == st.st_dev))
557 scanelf_dir(buf);
558 }
559 }
560 }
561 closedir(dir);
562 }
563
564 static int scanelf_from_file(char *filename)
565 {
566 FILE *fp = NULL;
567 char *p;
568 char path[_POSIX_PATH_MAX];
569
570 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
571 fp = stdin;
572 else if ((fp = fopen(filename, "r")) == NULL)
573 return 1;
574
575 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
576 if ((p = strchr(path, '\n')) != NULL)
577 *p = 0;
578 scanelf_dir(path);
579 }
580 if (fp != stdin)
581 fclose(fp);
582 return 0;
583 }
584
585 static void load_ld_so_conf()
586 {
587 FILE *fp = NULL;
588 char *p;
589 char path[_POSIX_PATH_MAX];
590 int i = 0;
591
592 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
593 return;
594
595 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
596 if (*path != '/')
597 continue;
598
599 if ((p = strrchr(path, '\r')) != NULL)
600 *p = 0;
601 if ((p = strchr(path, '\n')) != NULL)
602 *p = 0;
603
604 ldpaths[i++] = xstrdup(path);
605
606 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
607 break;
608 }
609 ldpaths[i] = NULL;
610
611 fclose(fp);
612 }
613
614 /* scan /etc/ld.so.conf for paths */
615 static void scanelf_ldpath()
616 {
617 char scan_l, scan_ul, scan_ull;
618 int i = 0;
619
620 if (!ldpaths[0])
621 err("Unable to load any paths from ld.so.conf");
622
623 scan_l = scan_ul = scan_ull = 0;
624
625 while (ldpaths[i]) {
626 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
627 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
628 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
629 scanelf_dir(ldpaths[i]);
630 ++i;
631 }
632
633 if (!scan_l) scanelf_dir("/lib");
634 if (!scan_ul) scanelf_dir("/usr/lib");
635 if (!scan_ull) scanelf_dir("/usr/local/lib");
636 }
637
638 /* scan env PATH for paths */
639 static void scanelf_envpath()
640 {
641 char *path, *p;
642
643 path = getenv("PATH");
644 if (!path)
645 err("PATH is not set in your env !");
646 path = xstrdup(path);
647
648 while ((p = strrchr(path, ':')) != NULL) {
649 scanelf_dir(p + 1);
650 *p = 0;
651 }
652
653 free(path);
654 }
655
656
657
658 /* usage / invocation handling functions */
659 #define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV"
660 #define a_argument required_argument
661 static struct option const long_opts[] = {
662 {"path", no_argument, NULL, 'p'},
663 {"ldpath", no_argument, NULL, 'l'},
664 {"recursive", no_argument, NULL, 'R'},
665 {"mount", no_argument, NULL, 'm'},
666 {"symlink", no_argument, NULL, 'y'},
667 {"pax", no_argument, NULL, 'x'},
668 {"header", no_argument, NULL, 'e'},
669 {"textrel", no_argument, NULL, 't'},
670 {"rpath", no_argument, NULL, 'r'},
671 {"needed", no_argument, NULL, 'n'},
672 {"interp", no_argument, NULL, 'i'},
673 {"bind", no_argument, NULL, 'b'},
674 {"symbol", a_argument, NULL, 's'},
675 {"all", no_argument, NULL, 'a'},
676 {"quiet", no_argument, NULL, 'q'},
677 {"verbose", no_argument, NULL, 'v'},
678 {"format", a_argument, NULL, 'F'},
679 {"from", a_argument, NULL, 'f'},
680 {"file", a_argument, NULL, 'o'},
681 {"nobanner", no_argument, NULL, 'B'},
682 {"help", no_argument, NULL, 'h'},
683 {"version", no_argument, NULL, 'V'},
684 {NULL, no_argument, NULL, 0x0}
685 };
686 static char *opts_help[] = {
687 "Scan all directories in PATH environment",
688 "Scan all directories in /etc/ld.so.conf",
689 "Scan directories recursively",
690 "Don't recursively cross mount points",
691 "Don't scan symlinks\n",
692 "Print PaX markings",
693 "Print GNU_STACK markings",
694 "Print TEXTREL information",
695 "Print RPATH information",
696 "Print NEEDED information",
697 "Print INTERP information",
698 "Print BIND information",
699 "Find a specified symbol",
700 "Print all scanned info (-x -e -t -r -n -i)\n",
701 "Only output 'bad' things",
702 "Be verbose (can be specified more than once)",
703 "Use specified format for output",
704 "Read input stream from a filename",
705 "Write output stream to a filename",
706 "Don't display the header",
707 "Print this help and exit",
708 "Print version and exit",
709 NULL
710 };
711
712 /* display usage and exit */
713 static void usage(int status)
714 {
715 unsigned long i;
716 printf("* Scan ELF binaries for stuff\n\n"
717 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
718 printf("Options: -[%s]\n", PARSE_FLAGS);
719 for (i = 0; long_opts[i].name; ++i)
720 if (long_opts[i].has_arg == no_argument)
721 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
722 long_opts[i].name, opts_help[i]);
723 else
724 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
725 long_opts[i].name, opts_help[i]);
726
727 if (status != EXIT_SUCCESS)
728 exit(status);
729
730 puts("\nThe format modifiers for the -F option are:");
731 puts(" %F Filename \t%x PaX Flags \t%e STACK/RELRO");
732 puts(" %t TEXTREL \t%r RPATH \t%n NEEDED");
733 puts(" %i INTERP \t%b BIND \t%s symbol");
734
735 exit(status);
736 }
737
738 /* parse command line arguments and preform needed actions */
739 static void parseargs(int argc, char *argv[])
740 {
741 int i;
742 char *from_file = NULL;
743
744 opterr = 0;
745 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
746 switch (i) {
747
748 case 'V':
749 printf("%s compiled %s\n%s\n"
750 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
751 __FILE__, __DATE__, rcsid, argv0);
752 exit(EXIT_SUCCESS);
753 break;
754 case 'h': usage(EXIT_SUCCESS); break;
755 case 'f':
756 if (from_file == NULL)
757 from_file = xstrdup(optarg);
758 break;
759 case 'o': {
760 FILE *fp = NULL;
761 fp = freopen(optarg, "w", stdout);
762 if (fp == NULL)
763 err("Could not open output stream '%s': %s", optarg, strerror(errno));
764 stdout = fp;
765 break;
766 }
767
768 case 's': {
769 size_t len;
770 find_sym = xstrdup(optarg);
771 len = strlen(find_sym) + 1;
772 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
773 sprintf(versioned_symname, "%s@", find_sym);
774 break;
775 }
776
777 case 'F': {
778 out_format = xstrdup(optarg);
779 break;
780 }
781
782 case 'y': scan_symlink = 0; break;
783 case 'B': show_banner = 0; break;
784 case 'l': scan_ldpath = 1; break;
785 case 'p': scan_envpath = 1; break;
786 case 'R': dir_recurse = 1; break;
787 case 'm': dir_crossmount = 0; break;
788 case 'x': show_pax = 1; break;
789 case 'e': show_stack = 1; break;
790 case 't': show_textrel = 1; break;
791 case 'r': show_rpath = 1; break;
792 case 'n': show_needed = 1; break;
793 case 'i': show_interp = 1; break;
794 case 'b': show_bind = 1; break;
795 case 'q': be_quiet = 1; break;
796 case 'v': be_verbose = (be_verbose % 20) + 1; break;
797 case 'a': show_pax = show_stack = show_textrel = show_rpath = \
798 show_needed = show_interp = show_bind = 1; break;
799
800 case ':':
801 err("Option missing parameter\n");
802 case '?':
803 err("Unknown option\n");
804 default:
805 err("Unhandled option '%c'", i);
806 }
807 }
808
809 /* let the format option override all other options */
810 if (out_format) {
811 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0;
812 for (i = 0; out_format[i]; ++i) {
813 if (out_format[i] != '%') continue;
814
815 switch (out_format[++i]) {
816 case '%': break;
817 case 'F': break;
818 case 's': break;
819 case 'o': break;
820 case 'x': show_pax = 1; break;
821 case 'e': show_stack = 1; break;
822 case 't': show_textrel = 1; break;
823 case 'r': show_rpath = 1; break;
824 case 'n': show_needed = 1; break;
825 case 'i': show_interp = 1; break;
826 case 'b': show_bind = 1; break;
827 default:
828 err("Invalid format specifier '%c' (byte %i)",
829 out_format[i], i+1);
830 }
831 }
832
833 /* construct our default format */
834 } else {
835 size_t fmt_len = 30;
836 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
837 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
838 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
839 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
840 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
841 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
842 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
843 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
844 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
845 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
846 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
847 }
848 if (be_verbose > 2) printf("Format: %s\n", out_format);
849
850 /* now lets actually do the scanning */
851 if (scan_ldpath || (show_rpath && be_quiet))
852 load_ld_so_conf();
853 if (scan_ldpath) scanelf_ldpath();
854 if (scan_envpath) scanelf_envpath();
855 if (from_file) {
856 scanelf_from_file(from_file);
857 free(from_file);
858 from_file = *argv;
859 }
860 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
861 err("Nothing to scan !?");
862 while (optind < argc)
863 scanelf_dir(argv[optind++]);
864
865 /* clean up */
866 if (find_sym) {
867 free(find_sym);
868 free(versioned_symname);
869 }
870 if (out_format) free(out_format);
871 for (i = 0; ldpaths[i]; ++i)
872 free(ldpaths[i]);
873 }
874
875
876
877 /* utility funcs */
878 static char *xstrdup(char *s)
879 {
880 char *ret = strdup(s);
881 if (!ret) err("Could not strdup(): %s", strerror(errno));
882 return ret;
883 }
884 static void *xmalloc(size_t size)
885 {
886 void *ret = malloc(size);
887 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
888 return ret;
889 }
890 static void xstrcat(char **dst, const char *src, size_t *curr_len)
891 {
892 long new_len;
893
894 new_len = strlen(*dst) + strlen(src);
895 if (*curr_len <= new_len) {
896 *curr_len = new_len + (*curr_len / 2);
897 *dst = realloc(*dst, *curr_len);
898 if (!*dst)
899 err("could not realloc %li bytes", (unsigned long)*curr_len);
900 }
901
902 strcat(*dst, src);
903 }
904 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
905 {
906 static char my_app[2];
907 my_app[0] = append;
908 my_app[1] = '\0';
909 xstrcat(dst, my_app, curr_len);
910 }
911
912
913
914 int main(int argc, char *argv[])
915 {
916 if (argc < 2)
917 usage(EXIT_FAILURE);
918 parseargs(argc, argv);
919 fclose(stdout);
920 return EXIT_SUCCESS;
921 }

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