/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.48 - (show annotations) (download) (as text)
Wed May 18 02:51:02 2005 UTC (9 years, 7 months ago) by vapier
Branch: MAIN
Changes since 1.47: +83 -44 lines
File MIME type: text/x-csrc
cache /etc/ld.so.conf so we can check it while scanning rpath

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 1.47 2005/05/18 01:08:46 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 1.47 2005/05/18 01:08:46 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_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 = 3; \
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) continue; \
272 needed = (char*)(elf->data + offset); \
273 if (*found_needed) xchrcat(ret, ',', ret_len); \
274 xstrcat(ret, needed, ret_len); \
275 *found_needed = 1; \
276 } \
277 ++dyn; \
278 } \
279 } }
280 SHOW_NEEDED(32)
281 SHOW_NEEDED(64)
282 }
283 }
284 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
285 {
286 void *strtbl_void;
287
288 if (!show_interp) return NULL;
289
290 strtbl_void = elf_findsecbyname(elf, ".interp");
291
292 if (strtbl_void) {
293 #define SHOW_INTERP(B) \
294 if (elf->elf_class == ELFCLASS ## B) { \
295 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
296 *found_interp = 1; \
297 return elf->data + EGET(strtbl->sh_offset); \
298 }
299 SHOW_INTERP(32)
300 SHOW_INTERP(64)
301 }
302 return NULL;
303 }
304 static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
305 {
306 unsigned long i;
307 void *symtab_void, *strtab_void;
308
309 if (!find_sym) return NULL;
310
311 symtab_void = elf_findsecbyname(elf, ".symtab");
312 strtab_void = elf_findsecbyname(elf, ".strtab");
313
314 if (symtab_void && strtab_void) {
315 #define FIND_SYM(B) \
316 if (elf->elf_class == ELFCLASS ## B) { \
317 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
318 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
319 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
320 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
321 char *symname; \
322 for (i = 0; i < cnt; ++i) { \
323 if (sym->st_name) { \
324 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
325 if (*find_sym == '*') { \
326 printf("%s(%s) %5lX %15s %s\n", \
327 ((*found_sym == 0) ? "\n\t" : "\t"), \
328 (char *)basename(filename), \
329 (long)sym->st_size, \
330 (char *)get_elfstttype(sym->st_info), \
331 symname); \
332 *found_sym = 1; \
333 } else if ((strcmp(find_sym, symname) == 0) || \
334 (strcmp(symname, versioned_symname) == 0)) \
335 (*found_sym)++; \
336 } \
337 ++sym; \
338 } }
339 FIND_SYM(32)
340 FIND_SYM(64)
341 }
342 if (*find_sym != '*' && *found_sym)
343 return find_sym;
344 if (be_quiet)
345 return NULL;
346 else
347 return " - ";
348 }
349 /* scan an elf file and show all the fun stuff */
350 #define prints(str) fputs(str, stdout)
351 static void scanelf_file(const char *filename)
352 {
353 unsigned long i;
354 char found_pax, found_stack, found_relro, found_textrel,
355 found_rpath, found_needed, found_interp, found_sym,
356 found_file;
357 elfobj *elf;
358 struct stat st;
359 static char *out_buffer = NULL;
360 static size_t out_len;
361
362 /* make sure 'filename' exists */
363 if (lstat(filename, &st) == -1) {
364 if (be_verbose > 2) printf("%s: does not exist\n", filename);
365 return;
366 }
367 /* always handle regular files and handle symlinked files if no -y */
368 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
369 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
370 return;
371 }
372
373 found_pax = found_stack = found_relro = found_textrel = \
374 found_rpath = found_needed = found_interp = found_sym = \
375 found_file = 0;
376
377 /* verify this is real ELF */
378 if ((elf = readelf(filename)) == NULL) {
379 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
380 return;
381 }
382
383 if (be_verbose > 1)
384 printf("%s: scanning file {%s,%s}\n", filename,
385 get_elfeitype(elf, EI_CLASS, elf->elf_class),
386 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
387 else if (be_verbose)
388 printf("%s: scanning file\n", filename);
389
390 /* init output buffer */
391 if (!out_buffer) {
392 out_len = sizeof(char) * 80;
393 out_buffer = (char*)xmalloc(out_len);
394 }
395 *out_buffer = '\0';
396
397 /* show the header */
398 if (!be_quiet && show_banner) {
399 for (i=0; out_format[i]; ++i) {
400 if (out_format[i] != '%') continue;
401
402 switch (out_format[++i]) {
403 case '%': break;
404 case 'F': prints("FILE "); break;
405 case 'o': prints(" TYPE "); break;
406 case 'x': prints(" PAX "); break;
407 case 'e': prints("STK/REL "); break;
408 case 't': prints("TEXTREL "); break;
409 case 'r': prints("RPATH "); break;
410 case 'n': prints("NEEDED "); break;
411 case 'i': prints("INTERP "); break;
412 case 's': prints("SYM "); break;
413 }
414 }
415 prints("\n");
416 show_banner = 0;
417 }
418
419 /* dump all the good stuff */
420 for (i=0; out_format[i]; ++i) {
421 const char *out;
422
423 /* make sure we trim leading spaces in quiet mode */
424 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
425 *out_buffer = '\0';
426
427 if (out_format[i] != '%') {
428 xchrcat(&out_buffer, out_format[i], &out_len);
429 continue;
430 }
431
432 out = NULL;
433 switch (out_format[++i]) {
434 case '%': xchrcat(&out_buffer, '%', &out_len); break;
435 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
436 case 'o': out = get_elfetype(elf); break;
437 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
438 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
439 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
440 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
441 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
442 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
443 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
444 }
445 if (out) xstrcat(&out_buffer, out, &out_len);
446 }
447
448 if (!found_file) {
449 if (!be_quiet || found_pax || found_stack || found_textrel || \
450 found_rpath || found_needed || found_interp || found_sym)
451 xstrcat(&out_buffer, filename, &out_len);
452 }
453 if (!(be_quiet && xemptybuffer(out_buffer)))
454 puts(out_buffer);
455
456 unreadelf(elf);
457 }
458
459 /* scan a directory for ET_EXEC files and print when we find one */
460 static void scanelf_dir(const char *path)
461 {
462 register DIR *dir;
463 register struct dirent *dentry;
464 struct stat st_top, st;
465 char buf[_POSIX_PATH_MAX];
466 size_t pathlen = 0, len = 0;
467
468 /* make sure path exists */
469 if (lstat(path, &st_top) == -1) {
470 if (be_verbose > 2) printf("%s: does not exist\n", path);
471 return;
472 }
473
474 /* ok, if it isn't a directory, assume we can open it */
475 if (!S_ISDIR(st_top.st_mode)) {
476 scanelf_file(path);
477 return;
478 }
479
480 /* now scan the dir looking for fun stuff */
481 if ((dir = opendir(path)) == NULL) {
482 warnf("could not opendir %s: %s", path, strerror(errno));
483 return;
484 }
485 if (be_verbose) printf("%s: scanning dir\n", path);
486
487 pathlen = strlen(path);
488 while ((dentry = readdir(dir))) {
489 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
490 continue;
491 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
492 if (len >= sizeof(buf)) {
493 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
494 continue;
495 }
496 sprintf(buf, "%s/%s", path, dentry->d_name);
497 if (lstat(buf, &st) != -1) {
498 if (S_ISREG(st.st_mode))
499 scanelf_file(buf);
500 else if (dir_recurse && S_ISDIR(st.st_mode)) {
501 if (dir_crossmount || (st_top.st_dev == st.st_dev))
502 scanelf_dir(buf);
503 }
504 }
505 }
506 closedir(dir);
507 }
508
509 static int scanelf_from_file(char *filename)
510 {
511 FILE *fp = NULL;
512 char *p;
513 char path[_POSIX_PATH_MAX];
514
515 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
516 fp = stdin;
517 else if ((fp = fopen(filename, "r")) == NULL)
518 return 1;
519
520 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
521 if ((p = strchr(path, '\n')) != NULL)
522 *p = 0;
523 scanelf_dir(path);
524 }
525 if (fp != stdin)
526 fclose(fp);
527 return 0;
528 }
529
530 static void load_ld_so_conf()
531 {
532 FILE *fp = NULL;
533 char *p;
534 char path[_POSIX_PATH_MAX];
535 int i = 0;
536
537 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
538 return;
539
540 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
541 if (*path != '/')
542 continue;
543
544 if ((p = strrchr(path, '\r')) != NULL)
545 *p = 0;
546 if ((p = strchr(path, '\n')) != NULL)
547 *p = 0;
548
549 ldpaths[i++] = xstrdup(path);
550
551 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
552 break;
553 }
554 ldpaths[i] = NULL;
555
556 fclose(fp);
557 }
558
559 /* scan /etc/ld.so.conf for paths */
560 static void scanelf_ldpath()
561 {
562 char scan_l, scan_ul, scan_ull;
563 int i = 0;
564
565 if (!ldpaths[0])
566 err("Unable to load any paths from ld.so.conf");
567
568 scan_l = scan_ul = scan_ull = 0;
569
570 while (ldpaths[i]) {
571 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
572 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
573 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
574 scanelf_dir(ldpaths[i]);
575 ++i;
576 }
577
578 if (!scan_l) scanelf_dir("/lib");
579 if (!scan_ul) scanelf_dir("/usr/lib");
580 if (!scan_ull) scanelf_dir("/usr/local/lib");
581 }
582
583 /* scan env PATH for paths */
584 static void scanelf_envpath()
585 {
586 char *path, *p;
587
588 path = getenv("PATH");
589 if (!path)
590 err("PATH is not set in your env !");
591 path = xstrdup(path);
592
593 while ((p = strrchr(path, ':')) != NULL) {
594 scanelf_dir(p + 1);
595 *p = 0;
596 }
597
598 free(path);
599 }
600
601
602
603 /* usage / invocation handling functions */
604 #define PARSE_FLAGS "plRmyxetrnis:aqvF:f:o:BhV"
605 #define a_argument required_argument
606 static struct option const long_opts[] = {
607 {"path", no_argument, NULL, 'p'},
608 {"ldpath", no_argument, NULL, 'l'},
609 {"recursive", no_argument, NULL, 'R'},
610 {"mount", no_argument, NULL, 'm'},
611 {"symlink", no_argument, NULL, 'y'},
612 {"pax", no_argument, NULL, 'x'},
613 {"header", no_argument, NULL, 'e'},
614 {"textrel", no_argument, NULL, 't'},
615 {"rpath", no_argument, NULL, 'r'},
616 {"needed", no_argument, NULL, 'n'},
617 {"interp", no_argument, NULL, 'i'},
618 {"symbol", a_argument, NULL, 's'},
619 {"all", no_argument, NULL, 'a'},
620 {"quiet", no_argument, NULL, 'q'},
621 {"verbose", no_argument, NULL, 'v'},
622 {"format", a_argument, NULL, 'F'},
623 {"from", a_argument, NULL, 'f'},
624 {"file", a_argument, NULL, 'o'},
625 {"nobanner", no_argument, NULL, 'B'},
626 {"help", no_argument, NULL, 'h'},
627 {"version", no_argument, NULL, 'V'},
628 {NULL, no_argument, NULL, 0x0}
629 };
630 static char *opts_help[] = {
631 "Scan all directories in PATH environment",
632 "Scan all directories in /etc/ld.so.conf",
633 "Scan directories recursively",
634 "Don't recursively cross mount points",
635 "Don't scan symlinks\n",
636 "Print PaX markings",
637 "Print GNU_STACK markings",
638 "Print TEXTREL information",
639 "Print RPATH information",
640 "Print NEEDED information",
641 "Print INTERP information",
642 "Find a specified symbol",
643 "Print all scanned info (-x -e -t -r -n -i)\n",
644 "Only output 'bad' things",
645 "Be verbose (can be specified more than once)",
646 "Use specified format for output",
647 "Read input stream from a filename",
648 "Write output stream to a filename",
649 "Don't display the header",
650 "Print this help and exit",
651 "Print version and exit",
652 NULL
653 };
654
655 /* display usage and exit */
656 static void usage(int status)
657 {
658 unsigned long i;
659 printf(" Scan ELF binaries for stuff\n\n"
660 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
661 printf("Options: -[%s]\n", PARSE_FLAGS);
662 for (i = 0; long_opts[i].name; ++i)
663 if (long_opts[i].has_arg == no_argument)
664 printf(" -%c, --%-13s %s\n", long_opts[i].val,
665 long_opts[i].name, opts_help[i]);
666 else
667 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val,
668 long_opts[i].name, opts_help[i]);
669
670 if (status != EXIT_SUCCESS)
671 exit(status);
672
673 puts("\nThe format modifiers for the -F option are:");
674 puts(" %F Filename \t%x PaX Flags \t%e STACK/RELRO");
675 puts(" %t TEXTREL \t%r RPATH \t%n NEEDED");
676 puts(" %i INTERP \t%s symbol");
677
678 exit(status);
679 }
680
681 /* parse command line arguments and preform needed actions */
682 static void parseargs(int argc, char *argv[])
683 {
684 int i;
685 char *from_file = NULL;
686
687 opterr = 0;
688 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
689 switch (i) {
690
691 case 'V':
692 printf("%s compiled %s\n%s\n"
693 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
694 __FILE__, __DATE__, rcsid, argv0);
695 exit(EXIT_SUCCESS);
696 break;
697 case 'h': usage(EXIT_SUCCESS); break;
698 case 'f':
699 if (from_file == NULL)
700 from_file = xstrdup(optarg);
701 break;
702 case 'o': {
703 FILE *fp = NULL;
704 fp = freopen(optarg, "w", stdout);
705 if (fp == NULL)
706 err("Could not open output stream '%s': %s", optarg, strerror(errno));
707 stdout = fp;
708 break;
709 }
710
711 case 's': {
712 size_t len;
713 find_sym = xstrdup(optarg);
714 len = strlen(find_sym) + 1;
715 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
716 sprintf(versioned_symname, "%s@", find_sym);
717 break;
718 }
719
720 case 'F': {
721 out_format = xstrdup(optarg);
722 break;
723 }
724
725 case 'y': scan_symlink = 0; break;
726 case 'B': show_banner = 0; break;
727 case 'l': scan_ldpath = 1; break;
728 case 'p': scan_envpath = 1; break;
729 case 'R': dir_recurse = 1; break;
730 case 'm': dir_crossmount = 0; break;
731 case 'x': show_pax = 1; break;
732 case 'e': show_stack = 1; break;
733 case 't': show_textrel = 1; break;
734 case 'r': show_rpath = 1; break;
735 case 'n': show_needed = 1; break;
736 case 'i': show_interp = 1; break;
737 case 'q': be_quiet = 1; break;
738 case 'v': be_verbose = (be_verbose % 20) + 1; break;
739 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break;
740
741 case ':':
742 warn("Option missing parameter\n");
743 usage(EXIT_FAILURE);
744 break;
745 case '?':
746 warn("Unknown option\n");
747 usage(EXIT_FAILURE);
748 break;
749 default:
750 err("Unhandled option '%c'", i);
751 break;
752 }
753 }
754
755 if (be_quiet && be_verbose)
756 err("You can be quiet or you can be verbose, not both, stupid");
757
758 /* let the format option override all other options */
759 if (out_format) {
760 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0;
761 for (i = 0; out_format[i]; ++i) {
762 if (out_format[i] != '%') continue;
763
764 switch (out_format[++i]) {
765 case '%': break;
766 case 'F': break;
767 case 's': break;
768 case 'o': break;
769 case 'x': show_pax = 1; break;
770 case 'e': show_stack = 1; break;
771 case 't': show_textrel = 1; break;
772 case 'r': show_rpath = 1; break;
773 case 'n': show_needed = 1; break;
774 case 'i': show_interp = 1; break;
775 default:
776 err("Invalid format specifier '%c' (byte %i)",
777 out_format[i], i+1);
778 }
779 }
780
781 /* construct our default format */
782 } else {
783 size_t fmt_len = 30;
784 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
785 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
786 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
787 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
788 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
789 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
790 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
791 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
792 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
793 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
794 }
795 if (be_verbose > 2) printf("Format: %s\n", out_format);
796
797 /* now lets actually do the scanning */
798 if (scan_ldpath || (show_rpath && be_quiet))
799 load_ld_so_conf();
800 if (scan_ldpath) scanelf_ldpath();
801 if (scan_envpath) scanelf_envpath();
802 if (from_file) {
803 scanelf_from_file(from_file);
804 free(from_file);
805 from_file = *argv;
806 }
807 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
808 err("Nothing to scan !?");
809 while (optind < argc)
810 scanelf_dir(argv[optind++]);
811
812 /* clean up */
813 if (find_sym) {
814 free(find_sym);
815 free(versioned_symname);
816 }
817 if (out_format) free(out_format);
818 for (i = 0; ldpaths[i]; ++i)
819 free(ldpaths[i]);
820 }
821
822
823
824 /* utility funcs */
825 static char *xstrdup(char *s)
826 {
827 char *ret = strdup(s);
828 if (!ret) err("Could not strdup(): %s", strerror(errno));
829 return ret;
830 }
831 static void *xmalloc(size_t size)
832 {
833 void *ret = malloc(size);
834 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
835 return ret;
836 }
837 static void xstrcat(char **dst, const char *src, size_t *curr_len)
838 {
839 long new_len;
840
841 new_len = strlen(*dst) + strlen(src);
842 if (*curr_len <= new_len) {
843 *curr_len = new_len + (*curr_len / 2);
844 *dst = realloc(*dst, *curr_len);
845 if (!*dst)
846 err("could not realloc %li bytes", (unsigned long)*curr_len);
847 }
848
849 strcat(*dst, src);
850 }
851 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
852 {
853 static char my_app[2];
854 my_app[0] = append;
855 my_app[1] = '\0';
856 xstrcat(dst, my_app, curr_len);
857 }
858 static int xemptybuffer(const char *buff)
859 {
860 long i;
861 for (i=0; buff[i]; ++i)
862 if (buff[i] != ' ')
863 return 0;
864 return 1;
865 }
866
867
868
869 int main(int argc, char *argv[])
870 {
871 if (argc < 2)
872 usage(EXIT_FAILURE);
873 parseargs(argc, argv);
874 fclose(stdout);
875 return EXIT_SUCCESS;
876 }

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