/[gentoo-projects]/pax-utils/scanelf.c
Gentoo

Contents of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.53 - (show annotations) (download) (as text)
Wed May 18 21:01:56 2005 UTC (9 years, 4 months ago) by solar
Branch: MAIN
Changes since 1.52: +3 -3 lines
File MIME type: text/x-csrc
- update formating for stk/rel and updated the manpage

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 1.52 2005/05/18 14:37:21 solar 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 1.52 2005/05/18 14:37:21 solar Exp $";
39 #define argv0 "scanelf"
40
41
42
43 /* prototypes */
44 static void scanelf_file(const char *filename);
45 static void scanelf_dir(const char *path);
46 static void scanelf_ldpath();
47 static void scanelf_envpath();
48 static void usage(int status);
49 static void parseargs(int argc, char *argv[]);
50 static char *xstrdup(char *s);
51 static void *xmalloc(size_t size);
52 static void xstrcat(char **dst, const char *src, size_t *curr_len);
53 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54 static int xemptybuffer(const char *buff);
55
56 /* variables to control behavior */
57 static char *ldpaths[256];
58 static char scan_ldpath = 0;
59 static char scan_envpath = 0;
60 static char scan_symlink = 1;
61 static char dir_recurse = 0;
62 static char dir_crossmount = 1;
63 static char show_pax = 0;
64 static char show_stack = 0;
65 static char show_textrel = 0;
66 static char show_rpath = 0;
67 static char show_needed = 0;
68 static char show_interp = 0;
69 static char show_bind = 0;
70 static char show_banner = 1;
71 static char be_quiet = 0;
72 static char be_verbose = 0;
73 static char *find_sym = NULL, *versioned_symname = NULL;
74 static char *out_format = NULL;
75
76
77
78 /* sub-funcs for scanelf_file() */
79 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
80 {
81 static char *paxflags;
82
83 if (!show_pax) return NULL;
84
85 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
86 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
87 *found_pax = 1;
88 return paxflags;
89 }
90
91 return NULL;
92 }
93 static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
94 {
95 static char ret[8];
96 char *found;
97 unsigned long i, off, shown;
98
99 if (!show_stack) return NULL;
100
101 shown = 0;
102 strcpy(ret, "--- ---");
103
104 if (elf->phdr) {
105 #define SHOW_STACK(B) \
106 if (elf->elf_class == ELFCLASS ## B) { \
107 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
108 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
109 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
110 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
111 found = found_stack; \
112 off = 0; \
113 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
114 found = found_relro; \
115 off = 4; \
116 } else \
117 continue; \
118 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
119 continue; \
120 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
121 *found = 1; \
122 ++shown; \
123 } \
124 }
125 SHOW_STACK(32)
126 SHOW_STACK(64)
127 }
128
129 if (be_quiet && !shown)
130 return NULL;
131 else
132 return ret;
133 }
134 static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
135 {
136 static char *ret = "TEXTREL";
137 unsigned long i;
138
139 if (!show_textrel) return NULL;
140
141 if (elf->phdr) {
142 #define SHOW_TEXTREL(B) \
143 if (elf->elf_class == ELFCLASS ## B) { \
144 Elf ## B ## _Dyn *dyn; \
145 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
146 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
147 Elf ## B ## _Off offset; \
148 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
149 if (phdr[i].p_type != PT_DYNAMIC) continue; \
150 offset = EGET(phdr[i].p_offset); \
151 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
152 dyn = DYN ## B (elf->data + offset); \
153 while (EGET(dyn->d_tag) != DT_NULL) { \
154 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
155 *found_textrel = 1; \
156 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
157 return ret; \
158 } \
159 ++dyn; \
160 } \
161 } }
162 SHOW_TEXTREL(32)
163 SHOW_TEXTREL(64)
164 }
165
166 if (be_quiet)
167 return NULL;
168 else
169 return " - ";
170 }
171 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
172 {
173 /* TODO: when checking RPATH entries, check each subpath (between :) in ld.so.conf */
174 unsigned long i, s;
175 char *rpath, *runpath, **r;
176 void *strtbl_void;
177
178 if (!show_rpath) return;
179
180 strtbl_void = elf_findsecbyname(elf, ".dynstr");
181 rpath = runpath = NULL;
182
183 if (elf->phdr && strtbl_void) {
184 #define SHOW_RPATH(B) \
185 if (elf->elf_class == ELFCLASS ## B) { \
186 Elf ## B ## _Dyn *dyn; \
187 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
188 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
189 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
190 Elf ## B ## _Off offset; \
191 Elf ## B ## _Sxword word; \
192 /* Scan all the program headers */ \
193 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
194 /* Just scan dynamic headers */ \
195 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
196 offset = EGET(phdr[i].p_offset); \
197 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
198 /* Just scan dynamic RPATH/RUNPATH headers */ \
199 dyn = DYN ## B (elf->data + offset); \
200 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
201 if (word == DT_RPATH) { \
202 r = &rpath; \
203 } else if (word == DT_RUNPATH) { \
204 r = &runpath; \
205 } else { \
206 ++dyn; \
207 continue; \
208 } \
209 /* Verify the memory is somewhat sane */ \
210 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
211 if (offset < elf->len) { \
212 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
213 *r = (char*)(elf->data + offset); \
214 /* If quiet, don't output paths in ld.so.conf */ \
215 if (be_quiet) \
216 for (s = 0; ldpaths[s]; ++s) \
217 if (!strcmp(ldpaths[s], *r)) { \
218 *r = NULL; \
219 break; \
220 } \
221 if (*r) *found_rpath = 1; \
222 } \
223 ++dyn; \
224 } \
225 } }
226 SHOW_RPATH(32)
227 SHOW_RPATH(64)
228 }
229
230 if (rpath && runpath) {
231 if (!strcmp(rpath, runpath)) {
232 xstrcat(ret, runpath, ret_len);
233 } else {
234 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
235 xchrcat(ret, '{', ret_len);
236 xstrcat(ret, rpath, ret_len);
237 xchrcat(ret, ',', ret_len);
238 xstrcat(ret, runpath, ret_len);
239 xchrcat(ret, '}', ret_len);
240 }
241 } else if (rpath || runpath)
242 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
243 else if (!be_quiet)
244 xstrcat(ret, " - ", ret_len);
245 }
246 static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
247 {
248 unsigned long i;
249 char *needed;
250 void *strtbl_void;
251
252 if (!show_needed) return;
253
254 strtbl_void = elf_findsecbyname(elf, ".dynstr");
255
256 if (elf->phdr && strtbl_void) {
257 #define SHOW_NEEDED(B) \
258 if (elf->elf_class == ELFCLASS ## B) { \
259 Elf ## B ## _Dyn *dyn; \
260 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
261 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
262 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
263 Elf ## B ## _Off offset; \
264 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
265 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
266 offset = EGET(phdr[i].p_offset); \
267 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
268 dyn = DYN ## B (elf->data + offset); \
269 while (EGET(dyn->d_tag) != DT_NULL) { \
270 if (EGET(dyn->d_tag) == DT_NEEDED) { \
271 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
272 if (offset >= elf->len) { \
273 ++dyn; \
274 continue; \
275 } \
276 needed = (char*)(elf->data + offset); \
277 if (*found_needed) xchrcat(ret, ',', ret_len); \
278 xstrcat(ret, needed, ret_len); \
279 *found_needed = 1; \
280 } \
281 ++dyn; \
282 } \
283 } }
284 SHOW_NEEDED(32)
285 SHOW_NEEDED(64)
286 }
287 }
288 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
289 {
290 void *strtbl_void;
291
292 if (!show_interp) return NULL;
293
294 strtbl_void = elf_findsecbyname(elf, ".interp");
295
296 if (strtbl_void) {
297 #define SHOW_INTERP(B) \
298 if (elf->elf_class == ELFCLASS ## B) { \
299 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
300 *found_interp = 1; \
301 return elf->data + EGET(strtbl->sh_offset); \
302 }
303 SHOW_INTERP(32)
304 SHOW_INTERP(64)
305 }
306 return NULL;
307 }
308 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
309 {
310 unsigned long i;
311 struct stat s;
312
313 if (!show_bind) return NULL;
314 if (!elf->phdr) return NULL;
315
316 #define SHOW_BIND(B) \
317 if (elf->elf_class == ELFCLASS ## B) { \
318 Elf ## B ## _Dyn *dyn; \
319 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
320 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
321 Elf ## B ## _Off offset; \
322 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
323 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
324 offset = EGET(phdr[i].p_offset); \
325 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
326 dyn = DYN ## B (elf->data + offset); \
327 while (EGET(dyn->d_tag) != DT_NULL) { \
328 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
329 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
330 { \
331 if (be_quiet) return NULL; \
332 *found_bind = 1; \
333 return "NOW"; \
334 } \
335 ++dyn; \
336 } \
337 } \
338 }
339 SHOW_BIND(32)
340 SHOW_BIND(64)
341
342 fstat(elf->fd, &s);
343 if (be_quiet && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
344 return NULL;
345 } else {
346 *found_bind = 1;
347 return "LAZY";
348 }
349 }
350 static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
351 {
352 unsigned long i;
353 void *symtab_void, *strtab_void;
354
355 if (!find_sym) return NULL;
356
357 symtab_void = elf_findsecbyname(elf, ".symtab");
358 strtab_void = elf_findsecbyname(elf, ".strtab");
359
360 if (symtab_void && strtab_void) {
361 #define FIND_SYM(B) \
362 if (elf->elf_class == ELFCLASS ## B) { \
363 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
364 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
365 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
366 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
367 char *symname; \
368 for (i = 0; i < cnt; ++i) { \
369 if (sym->st_name) { \
370 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
371 if (*find_sym == '*') { \
372 printf("%s(%s) %5lX %15s %s\n", \
373 ((*found_sym == 0) ? "\n\t" : "\t"), \
374 (char *)basename(filename), \
375 (long)sym->st_size, \
376 (char *)get_elfstttype(sym->st_info), \
377 symname); \
378 *found_sym = 1; \
379 } else if ((strcmp(find_sym, symname) == 0) || \
380 (strcmp(symname, versioned_symname) == 0)) \
381 (*found_sym)++; \
382 } \
383 ++sym; \
384 } }
385 FIND_SYM(32)
386 FIND_SYM(64)
387 }
388 if (*find_sym != '*' && *found_sym)
389 return find_sym;
390 if (be_quiet)
391 return NULL;
392 else
393 return " - ";
394 }
395 /* scan an elf file and show all the fun stuff */
396 #define prints(str) fputs(str, stdout)
397 static void scanelf_file(const char *filename)
398 {
399 unsigned long i;
400 char found_pax, found_stack, found_relro, found_textrel,
401 found_rpath, found_needed, found_interp, found_bind,
402 found_sym, found_file;
403 elfobj *elf;
404 struct stat st;
405 static char *out_buffer = NULL;
406 static size_t out_len;
407
408 /* make sure 'filename' exists */
409 if (lstat(filename, &st) == -1) {
410 if (be_verbose > 2) printf("%s: does not exist\n", filename);
411 return;
412 }
413 /* always handle regular files and handle symlinked files if no -y */
414 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
415 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
416 return;
417 }
418
419 found_pax = found_stack = found_relro = found_textrel = \
420 found_rpath = found_needed = found_interp = found_bind = \
421 found_sym = found_file = 0;
422
423 /* verify this is real ELF */
424 if ((elf = readelf(filename)) == NULL) {
425 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
426 return;
427 }
428
429 if (be_verbose > 1)
430 printf("%s: scanning file {%s,%s}\n", filename,
431 get_elfeitype(elf, EI_CLASS, elf->elf_class),
432 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
433 else if (be_verbose)
434 printf("%s: scanning file\n", filename);
435
436 /* init output buffer */
437 if (!out_buffer) {
438 out_len = sizeof(char) * 80;
439 out_buffer = (char*)xmalloc(out_len);
440 }
441 *out_buffer = '\0';
442
443 /* show the header */
444 if (!be_quiet && show_banner) {
445 for (i = 0; out_format[i]; ++i) {
446 if (out_format[i] != '%') continue;
447
448 switch (out_format[++i]) {
449 case '%': break;
450 case 'F': prints("FILE "); found_file = 1; break;
451 case 'o': prints(" TYPE "); break;
452 case 'x': prints(" PAX "); break;
453 case 'e': prints("STK/REL "); break;
454 case 't': prints("TEXTREL "); break;
455 case 'r': prints("RPATH "); break;
456 case 'n': prints("NEEDED "); break;
457 case 'i': prints("INTERP "); break;
458 case 'b': prints("BIND "); break;
459 case 's': prints("SYM "); break;
460 }
461 }
462 if (!found_file) prints("FILE ");
463 prints("\n");
464 found_file = 0;
465 show_banner = 0;
466 }
467
468 /* dump all the good stuff */
469 for (i = 0; out_format[i]; ++i) {
470 const char *out;
471
472 /* make sure we trim leading spaces in quiet mode */
473 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
474 *out_buffer = '\0';
475
476 if (out_format[i] != '%') {
477 xchrcat(&out_buffer, out_format[i], &out_len);
478 continue;
479 }
480
481 out = NULL;
482 switch (out_format[++i]) {
483 case '%': xchrcat(&out_buffer, '%', &out_len); break;
484 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
485 case 'o': out = get_elfetype(elf); break;
486 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
487 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
488 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
489 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
490 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
491 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
492 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
493 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
494 }
495 if (out) xstrcat(&out_buffer, out, &out_len);
496 }
497
498 if (!found_file) {
499 if (!be_quiet || found_pax || found_stack || found_textrel || \
500 found_rpath || found_needed || found_interp || found_bind || \
501 found_sym)
502 {
503 xchrcat(&out_buffer, ' ', &out_len);
504 xstrcat(&out_buffer, filename, &out_len);
505 }
506 }
507 if (!(be_quiet && xemptybuffer(out_buffer)))
508 puts(out_buffer);
509
510 unreadelf(elf);
511 }
512
513 /* scan a directory for ET_EXEC files and print when we find one */
514 static void scanelf_dir(const char *path)
515 {
516 register DIR *dir;
517 register struct dirent *dentry;
518 struct stat st_top, st;
519 char buf[_POSIX_PATH_MAX];
520 size_t pathlen = 0, len = 0;
521
522 /* make sure path exists */
523 if (lstat(path, &st_top) == -1) {
524 if (be_verbose > 2) printf("%s: does not exist\n", path);
525 return;
526 }
527
528 /* ok, if it isn't a directory, assume we can open it */
529 if (!S_ISDIR(st_top.st_mode)) {
530 scanelf_file(path);
531 return;
532 }
533
534 /* now scan the dir looking for fun stuff */
535 if ((dir = opendir(path)) == NULL) {
536 warnf("could not opendir %s: %s", path, strerror(errno));
537 return;
538 }
539 if (be_verbose) printf("%s: scanning dir\n", path);
540
541 pathlen = strlen(path);
542 while ((dentry = readdir(dir))) {
543 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
544 continue;
545 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
546 if (len >= sizeof(buf)) {
547 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
548 continue;
549 }
550 sprintf(buf, "%s/%s", path, dentry->d_name);
551 if (lstat(buf, &st) != -1) {
552 if (S_ISREG(st.st_mode))
553 scanelf_file(buf);
554 else if (dir_recurse && S_ISDIR(st.st_mode)) {
555 if (dir_crossmount || (st_top.st_dev == st.st_dev))
556 scanelf_dir(buf);
557 }
558 }
559 }
560 closedir(dir);
561 }
562
563 static int scanelf_from_file(char *filename)
564 {
565 FILE *fp = NULL;
566 char *p;
567 char path[_POSIX_PATH_MAX];
568
569 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
570 fp = stdin;
571 else if ((fp = fopen(filename, "r")) == NULL)
572 return 1;
573
574 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
575 if ((p = strchr(path, '\n')) != NULL)
576 *p = 0;
577 scanelf_dir(path);
578 }
579 if (fp != stdin)
580 fclose(fp);
581 return 0;
582 }
583
584 static void load_ld_so_conf()
585 {
586 FILE *fp = NULL;
587 char *p;
588 char path[_POSIX_PATH_MAX];
589 int i = 0;
590
591 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
592 return;
593
594 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
595 if (*path != '/')
596 continue;
597
598 if ((p = strrchr(path, '\r')) != NULL)
599 *p = 0;
600 if ((p = strchr(path, '\n')) != NULL)
601 *p = 0;
602
603 ldpaths[i++] = xstrdup(path);
604
605 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
606 break;
607 }
608 ldpaths[i] = NULL;
609
610 fclose(fp);
611 }
612
613 /* scan /etc/ld.so.conf for paths */
614 static void scanelf_ldpath()
615 {
616 char scan_l, scan_ul, scan_ull;
617 int i = 0;
618
619 if (!ldpaths[0])
620 err("Unable to load any paths from ld.so.conf");
621
622 scan_l = scan_ul = scan_ull = 0;
623
624 while (ldpaths[i]) {
625 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
626 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
627 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
628 scanelf_dir(ldpaths[i]);
629 ++i;
630 }
631
632 if (!scan_l) scanelf_dir("/lib");
633 if (!scan_ul) scanelf_dir("/usr/lib");
634 if (!scan_ull) scanelf_dir("/usr/local/lib");
635 }
636
637 /* scan env PATH for paths */
638 static void scanelf_envpath()
639 {
640 char *path, *p;
641
642 path = getenv("PATH");
643 if (!path)
644 err("PATH is not set in your env !");
645 path = xstrdup(path);
646
647 while ((p = strrchr(path, ':')) != NULL) {
648 scanelf_dir(p + 1);
649 *p = 0;
650 }
651
652 free(path);
653 }
654
655
656
657 /* usage / invocation handling functions */
658 #define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV"
659 #define a_argument required_argument
660 static struct option const long_opts[] = {
661 {"path", no_argument, NULL, 'p'},
662 {"ldpath", no_argument, NULL, 'l'},
663 {"recursive", no_argument, NULL, 'R'},
664 {"mount", no_argument, NULL, 'm'},
665 {"symlink", no_argument, NULL, 'y'},
666 {"pax", no_argument, NULL, 'x'},
667 {"header", no_argument, NULL, 'e'},
668 {"textrel", no_argument, NULL, 't'},
669 {"rpath", no_argument, NULL, 'r'},
670 {"needed", no_argument, NULL, 'n'},
671 {"interp", no_argument, NULL, 'i'},
672 {"bind", no_argument, NULL, 'b'},
673 {"symbol", a_argument, NULL, 's'},
674 {"all", no_argument, NULL, 'a'},
675 {"quiet", no_argument, NULL, 'q'},
676 {"verbose", no_argument, NULL, 'v'},
677 {"format", a_argument, NULL, 'F'},
678 {"from", a_argument, NULL, 'f'},
679 {"file", a_argument, NULL, 'o'},
680 {"nobanner", no_argument, NULL, 'B'},
681 {"help", no_argument, NULL, 'h'},
682 {"version", no_argument, NULL, 'V'},
683 {NULL, no_argument, NULL, 0x0}
684 };
685 static char *opts_help[] = {
686 "Scan all directories in PATH environment",
687 "Scan all directories in /etc/ld.so.conf",
688 "Scan directories recursively",
689 "Don't recursively cross mount points",
690 "Don't scan symlinks\n",
691 "Print PaX markings",
692 "Print GNU_STACK markings",
693 "Print TEXTREL information",
694 "Print RPATH information",
695 "Print NEEDED information",
696 "Print INTERP information",
697 "Print BIND information",
698 "Find a specified symbol",
699 "Print all scanned info (-x -e -t -r -n -i)\n",
700 "Only output 'bad' things",
701 "Be verbose (can be specified more than once)",
702 "Use specified format for output",
703 "Read input stream from a filename",
704 "Write output stream to a filename",
705 "Don't display the header",
706 "Print this help and exit",
707 "Print version and exit",
708 NULL
709 };
710
711 /* display usage and exit */
712 static void usage(int status)
713 {
714 unsigned long i;
715 printf("* Scan ELF binaries for stuff\n\n"
716 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
717 printf("Options: -[%s]\n", PARSE_FLAGS);
718 for (i = 0; long_opts[i].name; ++i)
719 if (long_opts[i].has_arg == no_argument)
720 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
721 long_opts[i].name, opts_help[i]);
722 else
723 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
724 long_opts[i].name, opts_help[i]);
725
726 if (status != EXIT_SUCCESS)
727 exit(status);
728
729 puts("\nThe format modifiers for the -F option are:");
730 puts(" %F Filename \t%x PaX Flags \t%e STACK/RELRO");
731 puts(" %t TEXTREL \t%r RPATH \t%n NEEDED");
732 puts(" %i INTERP \t%b BIND \t%s symbol");
733
734 exit(status);
735 }
736
737 /* parse command line arguments and preform needed actions */
738 static void parseargs(int argc, char *argv[])
739 {
740 int i;
741 char *from_file = NULL;
742
743 opterr = 0;
744 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
745 switch (i) {
746
747 case 'V':
748 printf("%s compiled %s\n%s\n"
749 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
750 __FILE__, __DATE__, rcsid, argv0);
751 exit(EXIT_SUCCESS);
752 break;
753 case 'h': usage(EXIT_SUCCESS); break;
754 case 'f':
755 if (from_file == NULL)
756 from_file = xstrdup(optarg);
757 break;
758 case 'o': {
759 FILE *fp = NULL;
760 fp = freopen(optarg, "w", stdout);
761 if (fp == NULL)
762 err("Could not open output stream '%s': %s", optarg, strerror(errno));
763 stdout = fp;
764 break;
765 }
766
767 case 's': {
768 size_t len;
769 find_sym = xstrdup(optarg);
770 len = strlen(find_sym) + 1;
771 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
772 sprintf(versioned_symname, "%s@", find_sym);
773 break;
774 }
775
776 case 'F': {
777 out_format = xstrdup(optarg);
778 break;
779 }
780
781 case 'y': scan_symlink = 0; break;
782 case 'B': show_banner = 0; break;
783 case 'l': scan_ldpath = 1; break;
784 case 'p': scan_envpath = 1; break;
785 case 'R': dir_recurse = 1; break;
786 case 'm': dir_crossmount = 0; break;
787 case 'x': show_pax = 1; break;
788 case 'e': show_stack = 1; break;
789 case 't': show_textrel = 1; break;
790 case 'r': show_rpath = 1; break;
791 case 'n': show_needed = 1; break;
792 case 'i': show_interp = 1; break;
793 case 'b': show_bind = 1; break;
794 case 'q': be_quiet = 1; break;
795 case 'v': be_verbose = (be_verbose % 20) + 1; break;
796 case 'a': show_pax = show_stack = show_textrel = show_rpath = \
797 show_needed = show_interp = show_bind = 1; break;
798
799 case ':':
800 err("Option missing parameter\n");
801 case '?':
802 err("Unknown option\n");
803 default:
804 err("Unhandled option '%c'", i);
805 }
806 }
807
808 /* let the format option override all other options */
809 if (out_format) {
810 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0;
811 for (i = 0; out_format[i]; ++i) {
812 if (out_format[i] != '%') continue;
813
814 switch (out_format[++i]) {
815 case '%': break;
816 case 'F': break;
817 case 's': break;
818 case 'o': break;
819 case 'x': show_pax = 1; break;
820 case 'e': show_stack = 1; break;
821 case 't': show_textrel = 1; break;
822 case 'r': show_rpath = 1; break;
823 case 'n': show_needed = 1; break;
824 case 'i': show_interp = 1; break;
825 case 'b': show_bind = 1; break;
826 default:
827 err("Invalid format specifier '%c' (byte %i)",
828 out_format[i], i+1);
829 }
830 }
831
832 /* construct our default format */
833 } else {
834 size_t fmt_len = 30;
835 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
836 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
837 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
838 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
839 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
840 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
841 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
842 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
843 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
844 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
845 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
846 }
847 if (be_verbose > 2) printf("Format: %s\n", out_format);
848
849 /* now lets actually do the scanning */
850 if (scan_ldpath || (show_rpath && be_quiet))
851 load_ld_so_conf();
852 if (scan_ldpath) scanelf_ldpath();
853 if (scan_envpath) scanelf_envpath();
854 if (from_file) {
855 scanelf_from_file(from_file);
856 free(from_file);
857 from_file = *argv;
858 }
859 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
860 err("Nothing to scan !?");
861 while (optind < argc)
862 scanelf_dir(argv[optind++]);
863
864 /* clean up */
865 if (find_sym) {
866 free(find_sym);
867 free(versioned_symname);
868 }
869 if (out_format) free(out_format);
870 for (i = 0; ldpaths[i]; ++i)
871 free(ldpaths[i]);
872 }
873
874
875
876 /* utility funcs */
877 static char *xstrdup(char *s)
878 {
879 char *ret = strdup(s);
880 if (!ret) err("Could not strdup(): %s", strerror(errno));
881 return ret;
882 }
883 static void *xmalloc(size_t size)
884 {
885 void *ret = malloc(size);
886 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
887 return ret;
888 }
889 static void xstrcat(char **dst, const char *src, size_t *curr_len)
890 {
891 long new_len;
892
893 new_len = strlen(*dst) + strlen(src);
894 if (*curr_len <= new_len) {
895 *curr_len = new_len + (*curr_len / 2);
896 *dst = realloc(*dst, *curr_len);
897 if (!*dst)
898 err("could not realloc %li bytes", (unsigned long)*curr_len);
899 }
900
901 strcat(*dst, src);
902 }
903 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
904 {
905 static char my_app[2];
906 my_app[0] = append;
907 my_app[1] = '\0';
908 xstrcat(dst, my_app, curr_len);
909 }
910 static int xemptybuffer(const char *buff)
911 {
912 long i;
913 for (i = 0; buff[i]; ++i)
914 if (buff[i] != ' ')
915 return 0;
916 return 1;
917 }
918
919
920
921 int main(int argc, char *argv[])
922 {
923 if (argc < 2)
924 usage(EXIT_FAILURE);
925 parseargs(argc, argv);
926 fclose(stdout);
927 return EXIT_SUCCESS;
928 }

  ViewVC Help
Powered by ViewVC 1.1.20