/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.84 - (show annotations) (download) (as text)
Fri Jul 22 00:10:51 2005 UTC (9 years, 1 month ago) by vapier
Branch: MAIN
Changes since 1.83: +69 -11 lines
File MIME type: text/x-csrc
add support for showing SONAME (-S)

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 1.83 2005/06/22 17:43:12 solar 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 1.83 2005/06/22 17:43:12 solar Exp $";
39 #define argv0 "scanelf"
40
41 #define IS_MODIFIER(c) (c == '%' || c == '#')
42
43
44
45 /* prototypes */
46 static void scanelf_file(const char *filename);
47 static void scanelf_dir(const char *path);
48 static void scanelf_ldpath();
49 static void scanelf_envpath();
50 static void usage(int status);
51 static void parseargs(int argc, char *argv[]);
52 static char *xstrdup(const char *s);
53 static void *xmalloc(size_t size);
54 static void xstrcat(char **dst, const char *src, size_t *curr_len);
55 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
56
57 /* variables to control behavior */
58 static char *ldpaths[256];
59 static char scan_ldpath = 0;
60 static char scan_envpath = 0;
61 static char scan_symlink = 1;
62 static char dir_recurse = 0;
63 static char dir_crossmount = 1;
64 static char show_pax = 0;
65 static char show_phdr = 0;
66 static char show_textrel = 0;
67 static char show_rpath = 0;
68 static char show_needed = 0;
69 static char show_interp = 0;
70 static char show_bind = 0;
71 static char show_soname = 0;
72 static char show_textrels = 0;
73 static char show_banner = 1;
74 static char be_quiet = 0;
75 static char be_verbose = 0;
76 static char be_wewy_wewy_quiet = 0;
77 static char *find_sym = NULL, *versioned_symname = NULL;
78 static char *find_lib = NULL;
79 static char *out_format = NULL;
80 static char *search_path = NULL;
81
82
83
84 /* sub-funcs for scanelf_file() */
85 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
86 {
87 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
88 #define GET_SYMTABS(B) \
89 if (elf->elf_class == ELFCLASS ## B) { \
90 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
91 /* debug sections */ \
92 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
93 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
94 /* runtime sections */ \
95 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
96 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
97 if (symtab && dynsym) { \
98 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
99 } else { \
100 *sym = (void*)(symtab ? symtab : dynsym); \
101 } \
102 if (strtab && dynstr) { \
103 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
104 } else { \
105 *tab = (void*)(strtab ? strtab : dynstr); \
106 } \
107 }
108 GET_SYMTABS(32)
109 GET_SYMTABS(64)
110 }
111 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
112 {
113 static char *paxflags;
114 static char ret[7];
115 unsigned long i, shown;
116
117 if (!show_pax) return NULL;
118
119 shown = 0;
120 memset(&ret, 0, sizeof(ret));
121
122 if (elf->phdr) {
123 #define SHOW_PAX(B) \
124 if (elf->elf_class == ELFCLASS ## B) { \
125 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
126 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
127 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
128 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
129 continue; \
130 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
131 continue; \
132 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
133 *found_pax = 1; \
134 ++shown; \
135 break; \
136 } \
137 }
138 SHOW_PAX(32)
139 SHOW_PAX(64)
140 }
141
142 /* fall back to EI_PAX if no PT_PAX was found */
143 if (!*ret) {
144 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
145 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
146 *found_pax = 1;
147 return paxflags;
148 }
149 strncpy(ret, paxflags, sizeof(ret));
150 }
151
152 if (be_quiet && !shown)
153 return NULL;
154 return ret;
155
156 }
157 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
158 {
159 static char ret[12];
160 char *found;
161 unsigned long i, off, shown, check_flags;
162 unsigned char multi_stack, multi_relro, multi_load;
163
164 if (!show_phdr) return NULL;
165
166 memcpy(ret, "--- --- ---\0", 12);
167
168 shown = 0;
169 multi_stack = multi_relro = multi_load = 0;
170
171 if (elf->phdr) {
172 #define SHOW_PHDR(B) \
173 if (elf->elf_class == ELFCLASS ## B) { \
174 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
175 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
176 uint32_t flags; \
177 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
178 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
179 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
180 found = found_phdr; \
181 off = 0; \
182 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
184 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
185 found = found_relro; \
186 off = 4; \
187 check_flags = PF_X; \
188 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
189 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
190 found = found_load; \
191 off = 8; \
192 check_flags = PF_W|PF_X; \
193 } else \
194 continue; \
195 flags = EGET(phdr[i].p_flags); \
196 if (be_quiet && ((flags & check_flags) != check_flags)) \
197 continue; \
198 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \
199 *found = 1; \
200 ++shown; \
201 } \
202 }
203 SHOW_PHDR(32)
204 SHOW_PHDR(64)
205 }
206
207 if (be_quiet && !shown)
208 return NULL;
209 else
210 return ret;
211 }
212 static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
213 {
214 static char ret[] = "TEXTREL";
215 unsigned long i;
216
217 if (!show_textrel && !show_textrels) return NULL;
218
219 if (elf->phdr) {
220 #define SHOW_TEXTREL(B) \
221 if (elf->elf_class == ELFCLASS ## B) { \
222 Elf ## B ## _Dyn *dyn; \
223 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
224 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
225 Elf ## B ## _Off offset; \
226 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
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 dyn = DYN ## B (elf->data + offset); \
231 while (EGET(dyn->d_tag) != DT_NULL) { \
232 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
233 *found_textrel = 1; \
234 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
235 return (be_wewy_wewy_quiet ? NULL : ret); \
236 } \
237 ++dyn; \
238 } \
239 } }
240 SHOW_TEXTREL(32)
241 SHOW_TEXTREL(64)
242 }
243
244 if (be_quiet || be_wewy_wewy_quiet)
245 return NULL;
246 else
247 return (char *)" - ";
248 }
249 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
250 {
251 unsigned long s, r, rmax;
252 void *symtab_void, *strtab_void, *text_void;
253
254 if (!show_textrels) return NULL;
255
256 /* don't search for TEXTREL's if the ELF doesn't have any */
257 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
258 if (!*found_textrel) return NULL;
259
260 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
261 text_void = elf_findsecbyname(elf, ".text");
262
263 if (symtab_void && strtab_void && text_void && elf->shdr) {
264 #define SHOW_TEXTRELS(B) \
265 if (elf->elf_class == ELFCLASS ## B) { \
266 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
267 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
268 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
269 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
270 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
271 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
272 uint ## B ## _t memsz = EGET(text->sh_size); \
273 Elf ## B ## _Rel *rel; \
274 Elf ## B ## _Rela *rela; \
275 /* search the section headers for relocations */ \
276 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
277 uint32_t sh_type = EGET(shdr[s].sh_type); \
278 if (sh_type == SHT_REL) { \
279 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
280 rela = NULL; \
281 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
282 } else if (sh_type == SHT_RELA) { \
283 rel = NULL; \
284 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
285 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
286 } else \
287 continue; \
288 /* now see if any of the relocs are in the .text */ \
289 for (r = 0; r < rmax; ++r) { \
290 unsigned long sym_max; \
291 Elf ## B ## _Addr offset_tmp; \
292 Elf ## B ## _Sym *func; \
293 Elf ## B ## _Sym *sym; \
294 Elf ## B ## _Addr r_offset; \
295 uint ## B ## _t r_info; \
296 if (sh_type == SHT_REL) { \
297 r_offset = EGET(rel[r].r_offset); \
298 r_info = EGET(rel[r].r_info); \
299 } else { \
300 r_offset = EGET(rela[r].r_offset); \
301 r_info = EGET(rela[r].r_info); \
302 } \
303 /* make sure this relocation is inside of the .text */ \
304 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
305 if (be_verbose <= 2) continue; \
306 } else \
307 *found_textrels = 1; \
308 /* locate this relocation symbol name */ \
309 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
310 sym_max = ELF ## B ## _R_SYM(r_info); \
311 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
312 sym += sym_max; \
313 else \
314 sym = NULL; \
315 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
316 /* show the raw details about this reloc */ \
317 printf("\tTEXTREL %s: ", elf->base_filename); \
318 if (sym && sym->st_name) \
319 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
320 else \
321 printf("(NULL: fake?)"); \
322 printf(" [0x%lX]", (unsigned long)r_offset); \
323 /* now try to find the closest symbol that this rel is probably in */ \
324 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
325 func = NULL; \
326 offset_tmp = 0; \
327 while (sym_max--) { \
328 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
329 func = sym; \
330 offset_tmp = EGET(sym->st_value); \
331 } \
332 ++sym; \
333 } \
334 printf(" in "); \
335 if (func && func->st_name) \
336 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
337 else \
338 printf("(NULL: fake?)"); \
339 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
340 } \
341 } }
342 SHOW_TEXTRELS(32)
343 SHOW_TEXTRELS(64)
344 }
345 if (!*found_textrels)
346 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
347
348 return NULL;
349 }
350
351 static void rpath_security_checks(elfobj *, char *);
352 static void rpath_security_checks(elfobj *elf, char *item) {
353 struct stat st;
354 switch (*item) {
355 case 0:
356 warnf("Security problem NULL RPATH in %s", elf->filename);
357 break;
358 case '/': break;
359 case '$':
360 if (fstat(elf->fd, &st) != -1)
361 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
362 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
363 item, elf->filename, st.st_mode & 07777);
364 break;
365 default:
366 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
367 break;
368 }
369 }
370 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
371 {
372 unsigned long i, s;
373 char *rpath, *runpath, **r;
374 void *strtbl_void;
375
376 if (!show_rpath) return;
377
378 strtbl_void = elf_findsecbyname(elf, ".dynstr");
379 rpath = runpath = NULL;
380
381 if (elf->phdr && strtbl_void) {
382 #define SHOW_RPATH(B) \
383 if (elf->elf_class == ELFCLASS ## B) { \
384 Elf ## B ## _Dyn *dyn; \
385 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
386 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
387 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
388 Elf ## B ## _Off offset; \
389 Elf ## B ## _Xword word; \
390 /* Scan all the program headers */ \
391 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
392 /* Just scan dynamic headers */ \
393 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
394 offset = EGET(phdr[i].p_offset); \
395 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
396 /* Just scan dynamic RPATH/RUNPATH headers */ \
397 dyn = DYN ## B (elf->data + offset); \
398 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
399 if (word == DT_RPATH) { \
400 r = &rpath; \
401 } else if (word == DT_RUNPATH) { \
402 r = &runpath; \
403 } else { \
404 ++dyn; \
405 continue; \
406 } \
407 /* Verify the memory is somewhat sane */ \
408 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
409 if (offset < (Elf ## B ## _Off)elf->len) { \
410 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
411 *r = (char*)(elf->data + offset); \
412 /* If quiet, don't output paths in ld.so.conf */ \
413 if (be_quiet) { \
414 size_t len; \
415 char *start, *end; \
416 /* note that we only 'chop' off leading known paths. */ \
417 /* since *r is read-only memory, we can only move the ptr forward. */ \
418 start = *r; \
419 /* scan each path in : delimited list */ \
420 while (start) { \
421 rpath_security_checks(elf, start); \
422 end = strchr(start, ':'); \
423 len = (end ? abs(end - start) : strlen(start)); \
424 for (s = 0; ldpaths[s]; ++s) { \
425 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
426 *r = (end ? end + 1 : NULL); \
427 break; \
428 } \
429 } \
430 if (!*r || !ldpaths[s] || !end) \
431 start = NULL; \
432 else \
433 start = start + len + 1; \
434 } \
435 } \
436 if (*r) *found_rpath = 1; \
437 } \
438 ++dyn; \
439 } \
440 } }
441 SHOW_RPATH(32)
442 SHOW_RPATH(64)
443 }
444
445 if (be_wewy_wewy_quiet) return;
446
447 if (rpath && runpath) {
448 if (!strcmp(rpath, runpath)) {
449 xstrcat(ret, runpath, ret_len);
450 } else {
451 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
452 xchrcat(ret, '{', ret_len);
453 xstrcat(ret, rpath, ret_len);
454 xchrcat(ret, ',', ret_len);
455 xstrcat(ret, runpath, ret_len);
456 xchrcat(ret, '}', ret_len);
457 }
458 } else if (rpath || runpath)
459 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
460 else if (!be_quiet)
461 xstrcat(ret, " - ", ret_len);
462 }
463 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
464 {
465 unsigned long i;
466 char *needed;
467 void *strtbl_void;
468
469 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
470
471 strtbl_void = elf_findsecbyname(elf, ".dynstr");
472
473 if (elf->phdr && strtbl_void) {
474 #define SHOW_NEEDED(B) \
475 if (elf->elf_class == ELFCLASS ## B) { \
476 Elf ## B ## _Dyn *dyn; \
477 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
478 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
479 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
480 Elf ## B ## _Off offset; \
481 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
482 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
483 offset = EGET(phdr[i].p_offset); \
484 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
485 dyn = DYN ## B (elf->data + offset); \
486 while (EGET(dyn->d_tag) != DT_NULL) { \
487 if (EGET(dyn->d_tag) == DT_NEEDED) { \
488 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
489 if (offset >= (Elf ## B ## _Off)elf->len) { \
490 ++dyn; \
491 continue; \
492 } \
493 needed = (char*)(elf->data + offset); \
494 if (op == 0) { \
495 if (!be_wewy_wewy_quiet) { \
496 if (*found_needed) xchrcat(ret, ',', ret_len); \
497 xstrcat(ret, needed, ret_len); \
498 } \
499 *found_needed = 1; \
500 } else { \
501 if (!strcmp(find_lib, needed)) { \
502 *found_lib = 1; \
503 return (be_wewy_wewy_quiet ? NULL : find_lib); \
504 } \
505 } \
506 } \
507 ++dyn; \
508 } \
509 } }
510 SHOW_NEEDED(32)
511 SHOW_NEEDED(64)
512 #if 0
513 if (op == 0 && !*found_needed)
514 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
515 #endif
516 }
517
518 return NULL;
519 }
520 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
521 {
522 void *strtbl_void;
523
524 if (!show_interp) return NULL;
525
526 strtbl_void = elf_findsecbyname(elf, ".interp");
527
528 if (strtbl_void) {
529 #define SHOW_INTERP(B) \
530 if (elf->elf_class == ELFCLASS ## B) { \
531 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
532 *found_interp = 1; \
533 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
534 }
535 SHOW_INTERP(32)
536 SHOW_INTERP(64)
537 }
538 return NULL;
539 }
540 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
541 {
542 unsigned long i;
543 struct stat s;
544
545 if (!show_bind) return NULL;
546 if (!elf->phdr) return NULL;
547
548 #define SHOW_BIND(B) \
549 if (elf->elf_class == ELFCLASS ## B) { \
550 Elf ## B ## _Dyn *dyn; \
551 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
552 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
553 Elf ## B ## _Off offset; \
554 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
555 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
556 offset = EGET(phdr[i].p_offset); \
557 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
558 dyn = DYN ## B (elf->data + offset); \
559 while (EGET(dyn->d_tag) != DT_NULL) { \
560 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
561 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
562 { \
563 if (be_quiet) return NULL; \
564 *found_bind = 1; \
565 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
566 } \
567 ++dyn; \
568 } \
569 } \
570 }
571 SHOW_BIND(32)
572 SHOW_BIND(64)
573
574 if (be_wewy_wewy_quiet) return NULL;
575
576 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
577 return NULL;
578 } else {
579 *found_bind = 1;
580 return (char *) "LAZY";
581 }
582 }
583 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
584 {
585 unsigned long i;
586 char *soname;
587 void *strtbl_void;
588
589 if (!show_soname) return NULL;
590
591 strtbl_void = elf_findsecbyname(elf, ".dynstr");
592
593 if (elf->phdr && strtbl_void) {
594 #define SHOW_SONAME(B) \
595 if (elf->elf_class == ELFCLASS ## B) { \
596 Elf ## B ## _Dyn *dyn; \
597 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
598 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
599 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
600 Elf ## B ## _Off offset; \
601 /* only look for soname in shared objects */ \
602 if (ehdr->e_type != ET_DYN) \
603 return NULL; \
604 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
605 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
606 offset = EGET(phdr[i].p_offset); \
607 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
608 dyn = DYN ## B (elf->data + offset); \
609 while (EGET(dyn->d_tag) != DT_NULL) { \
610 if (EGET(dyn->d_tag) == DT_SONAME) { \
611 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
612 if (offset >= (Elf ## B ## _Off)elf->len) { \
613 ++dyn; \
614 continue; \
615 } \
616 soname = (char*)(elf->data + offset); \
617 *found_soname = 1; \
618 return (be_wewy_wewy_quiet ? NULL : soname); \
619 } \
620 ++dyn; \
621 } \
622 } }
623 SHOW_SONAME(32)
624 SHOW_SONAME(64)
625 }
626
627 return NULL;
628 }
629 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
630 {
631 unsigned long i;
632 void *symtab_void, *strtab_void;
633
634 if (!find_sym) return NULL;
635
636 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
637
638 if (symtab_void && strtab_void) {
639 #define FIND_SYM(B) \
640 if (elf->elf_class == ELFCLASS ## B) { \
641 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
642 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
643 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
644 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
645 char *symname; \
646 for (i = 0; i < cnt; ++i) { \
647 if (sym->st_name) { \
648 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
649 if (*find_sym == '*') { \
650 printf("%s(%s) %5lX %15s %s\n", \
651 ((*found_sym == 0) ? "\n\t" : "\t"), \
652 elf->base_filename, \
653 (long)sym->st_size, \
654 (char *)get_elfstttype(sym->st_info), \
655 symname); \
656 *found_sym = 1; \
657 } else if ((strcmp(find_sym, symname) == 0) || \
658 (strcmp(symname, versioned_symname) == 0)) \
659 (*found_sym)++; \
660 } \
661 ++sym; \
662 } }
663 FIND_SYM(32)
664 FIND_SYM(64)
665 }
666
667 if (be_wewy_wewy_quiet) return NULL;
668
669 if (*find_sym != '*' && *found_sym)
670 return find_sym;
671 if (be_quiet)
672 return NULL;
673 else
674 return (char *)" - ";
675 }
676 /* scan an elf file and show all the fun stuff */
677 #define prints(str) write(fileno(stdout), str, strlen(str))
678 static void scanelf_file(const char *filename)
679 {
680 unsigned long i;
681 char found_pax, found_phdr, found_relro, found_load, found_textrel,
682 found_rpath, found_needed, found_interp, found_bind, found_soname,
683 found_sym, found_lib, found_file, found_textrels;
684 elfobj *elf;
685 struct stat st;
686 static char *out_buffer = NULL;
687 static size_t out_len;
688
689 /* make sure 'filename' exists */
690 if (lstat(filename, &st) == -1) {
691 if (be_verbose > 2) printf("%s: does not exist\n", filename);
692 return;
693 }
694 /* always handle regular files and handle symlinked files if no -y */
695 if (S_ISLNK(st.st_mode)) {
696 if (!scan_symlink) return;
697 stat(filename, &st);
698 }
699 if (!S_ISREG(st.st_mode)) {
700 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
701 return;
702 }
703
704 found_pax = found_phdr = found_relro = found_load = found_textrel = \
705 found_rpath = found_needed = found_interp = found_bind = found_soname = \
706 found_sym = found_lib = found_file = found_textrels = 0;
707
708 /* verify this is real ELF */
709 if ((elf = readelf(filename)) == NULL) {
710 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
711 return;
712 }
713
714 if (be_verbose > 1)
715 printf("%s: scanning file {%s,%s}\n", filename,
716 get_elfeitype(EI_CLASS, elf->elf_class),
717 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
718 else if (be_verbose)
719 printf("%s: scanning file\n", filename);
720
721 /* init output buffer */
722 if (!out_buffer) {
723 out_len = sizeof(char) * 80;
724 out_buffer = (char*)xmalloc(out_len);
725 }
726 *out_buffer = '\0';
727
728 /* show the header */
729 if (!be_quiet && show_banner) {
730 for (i = 0; out_format[i]; ++i) {
731 if (!IS_MODIFIER(out_format[i])) continue;
732
733 switch (out_format[++i]) {
734 case '%': break;
735 case '#': break;
736 case 'F':
737 case 'p':
738 case 'f': prints("FILE "); found_file = 1; break;
739 case 'o': prints(" TYPE "); break;
740 case 'x': prints(" PAX "); break;
741 case 'e': prints("STK/REL/PTL "); break;
742 case 't': prints("TEXTREL "); break;
743 case 'r': prints("RPATH "); break;
744 case 'n': prints("NEEDED "); break;
745 case 'i': prints("INTERP "); break;
746 case 'b': prints("BIND "); break;
747 case 'S': prints("SONAME "); break;
748 case 's': prints("SYM "); break;
749 case 'N': prints("LIB "); break;
750 case 'T': prints("TEXTRELS "); break;
751 default: warnf("'%c' has no title ?", out_format[i]);
752 }
753 }
754 if (!found_file) prints("FILE ");
755 prints("\n");
756 found_file = 0;
757 show_banner = 0;
758 }
759
760 /* dump all the good stuff */
761 for (i = 0; out_format[i]; ++i) {
762 const char *out;
763 const char *tmp;
764
765 /* make sure we trim leading spaces in quiet mode */
766 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
767 *out_buffer = '\0';
768
769 if (!IS_MODIFIER(out_format[i])) {
770 xchrcat(&out_buffer, out_format[i], &out_len);
771 continue;
772 }
773
774 out = NULL;
775 be_wewy_wewy_quiet = (out_format[i] == '#');
776 switch (out_format[++i]) {
777 case '%':
778 case '#':
779 xchrcat(&out_buffer, out_format[i], &out_len); break;
780 case 'F':
781 found_file = 1;
782 if (be_wewy_wewy_quiet) break;
783 xstrcat(&out_buffer, filename, &out_len);
784 break;
785 case 'p':
786 found_file = 1;
787 if (be_wewy_wewy_quiet) break;
788 tmp = filename;
789 if (search_path) {
790 ssize_t len_search = strlen(search_path);
791 ssize_t len_file = strlen(filename);
792 if (!strncmp(filename, search_path, len_search) && \
793 len_file > len_search)
794 tmp += len_search;
795 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
796 }
797 xstrcat(&out_buffer, tmp, &out_len);
798 break;
799 case 'f':
800 found_file = 1;
801 if (be_wewy_wewy_quiet) break;
802 tmp = strrchr(filename, '/');
803 tmp = (tmp == NULL ? filename : tmp+1);
804 xstrcat(&out_buffer, tmp, &out_len);
805 break;
806 case 'o': out = get_elfetype(elf); break;
807 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
808 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
809 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
810 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
811 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
812 case 'n':
813 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
814 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
815 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
816 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
817 case 's': out = scanelf_file_sym(elf, &found_sym); break;
818 default: warnf("'%c' has no scan code?", out_format[i]);
819 }
820 if (out) xstrcat(&out_buffer, out, &out_len);
821 }
822
823 #define FOUND_SOMETHING() \
824 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
825 found_rpath || found_needed || found_interp || found_bind || \
826 found_soname || found_sym || found_lib || found_textrels)
827
828 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
829 xchrcat(&out_buffer, ' ', &out_len);
830 xstrcat(&out_buffer, filename, &out_len);
831 }
832 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
833 puts(out_buffer);
834 fflush(stdout);
835 }
836
837 unreadelf(elf);
838 }
839
840 /* scan a directory for ET_EXEC files and print when we find one */
841 static void scanelf_dir(const char *path)
842 {
843 register DIR *dir;
844 register struct dirent *dentry;
845 struct stat st_top, st;
846 char buf[_POSIX_PATH_MAX];
847 size_t pathlen = 0, len = 0;
848
849 /* make sure path exists */
850 if (lstat(path, &st_top) == -1) {
851 if (be_verbose > 2) printf("%s: does not exist\n", path);
852 return;
853 }
854
855 /* ok, if it isn't a directory, assume we can open it */
856 if (!S_ISDIR(st_top.st_mode)) {
857 scanelf_file(path);
858 return;
859 }
860
861 /* now scan the dir looking for fun stuff */
862 if ((dir = opendir(path)) == NULL) {
863 warnf("could not opendir %s: %s", path, strerror(errno));
864 return;
865 }
866 if (be_verbose) printf("%s: scanning dir\n", path);
867
868 pathlen = strlen(path);
869 while ((dentry = readdir(dir))) {
870 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
871 continue;
872 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
873 if (len >= sizeof(buf)) {
874 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
875 (unsigned long)len, (unsigned long)sizeof(buf));
876 continue;
877 }
878 sprintf(buf, "%s/%s", path, dentry->d_name);
879 if (lstat(buf, &st) != -1) {
880 if (S_ISREG(st.st_mode))
881 scanelf_file(buf);
882 else if (dir_recurse && S_ISDIR(st.st_mode)) {
883 if (dir_crossmount || (st_top.st_dev == st.st_dev))
884 scanelf_dir(buf);
885 }
886 }
887 }
888 closedir(dir);
889 }
890
891 static int scanelf_from_file(char *filename)
892 {
893 FILE *fp = NULL;
894 char *p;
895 char path[_POSIX_PATH_MAX];
896
897 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
898 fp = stdin;
899 else if ((fp = fopen(filename, "r")) == NULL)
900 return 1;
901
902 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
903 if ((p = strchr(path, '\n')) != NULL)
904 *p = 0;
905 search_path = path;
906 scanelf_dir(path);
907 }
908 if (fp != stdin)
909 fclose(fp);
910 return 0;
911 }
912
913 static void load_ld_so_conf()
914 {
915 FILE *fp = NULL;
916 char *p;
917 char path[_POSIX_PATH_MAX];
918 int i = 0;
919
920 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
921 return;
922
923 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
924 if (*path != '/')
925 continue;
926
927 if ((p = strrchr(path, '\r')) != NULL)
928 *p = 0;
929 if ((p = strchr(path, '\n')) != NULL)
930 *p = 0;
931
932 ldpaths[i++] = xstrdup(path);
933
934 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
935 break;
936 }
937 ldpaths[i] = NULL;
938
939 fclose(fp);
940 }
941
942 /* scan /etc/ld.so.conf for paths */
943 static void scanelf_ldpath()
944 {
945 char scan_l, scan_ul, scan_ull;
946 int i = 0;
947
948 if (!ldpaths[0])
949 err("Unable to load any paths from ld.so.conf");
950
951 scan_l = scan_ul = scan_ull = 0;
952
953 while (ldpaths[i]) {
954 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
955 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
956 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
957 scanelf_dir(ldpaths[i]);
958 ++i;
959 }
960
961 if (!scan_l) scanelf_dir("/lib");
962 if (!scan_ul) scanelf_dir("/usr/lib");
963 if (!scan_ull) scanelf_dir("/usr/local/lib");
964 }
965
966 /* scan env PATH for paths */
967 static void scanelf_envpath()
968 {
969 char *path, *p;
970
971 path = getenv("PATH");
972 if (!path)
973 err("PATH is not set in your env !");
974 path = xstrdup(path);
975
976 while ((p = strrchr(path, ':')) != NULL) {
977 scanelf_dir(p + 1);
978 *p = 0;
979 }
980
981 free(path);
982 }
983
984
985
986 /* usage / invocation handling functions */
987 #define PARSE_FLAGS "plRmyxetrnibSs:N:TaqvF:f:o:BhV"
988 #define a_argument required_argument
989 static struct option const long_opts[] = {
990 {"path", no_argument, NULL, 'p'},
991 {"ldpath", no_argument, NULL, 'l'},
992 {"recursive", no_argument, NULL, 'R'},
993 {"mount", no_argument, NULL, 'm'},
994 {"symlink", no_argument, NULL, 'y'},
995 {"pax", no_argument, NULL, 'x'},
996 {"header", no_argument, NULL, 'e'},
997 {"textrel", no_argument, NULL, 't'},
998 {"rpath", no_argument, NULL, 'r'},
999 {"needed", no_argument, NULL, 'n'},
1000 {"interp", no_argument, NULL, 'i'},
1001 {"bind", no_argument, NULL, 'b'},
1002 {"soname", no_argument, NULL, 'S'},
1003 {"symbol", a_argument, NULL, 's'},
1004 {"lib", a_argument, NULL, 'N'},
1005 {"textrels", no_argument, NULL, 'T'},
1006 {"all", no_argument, NULL, 'a'},
1007 {"quiet", no_argument, NULL, 'q'},
1008 {"verbose", no_argument, NULL, 'v'},
1009 {"format", a_argument, NULL, 'F'},
1010 {"from", a_argument, NULL, 'f'},
1011 {"file", a_argument, NULL, 'o'},
1012 {"nobanner", no_argument, NULL, 'B'},
1013 {"help", no_argument, NULL, 'h'},
1014 {"version", no_argument, NULL, 'V'},
1015 {NULL, no_argument, NULL, 0x0}
1016 };
1017
1018 static const char *opts_help[] = {
1019 "Scan all directories in PATH environment",
1020 "Scan all directories in /etc/ld.so.conf",
1021 "Scan directories recursively",
1022 "Don't recursively cross mount points",
1023 "Don't scan symlinks\n",
1024 "Print PaX markings",
1025 "Print GNU_STACK/PT_LOAD markings",
1026 "Print TEXTREL information",
1027 "Print RPATH information",
1028 "Print NEEDED information",
1029 "Print INTERP information",
1030 "Print BIND information",
1031 "Print SONAME information",
1032 "Find a specified symbol",
1033 "Find a specified library",
1034 "Locate cause of TEXTREL",
1035 "Print all scanned info (-x -e -t -r -b)\n",
1036 "Only output 'bad' things",
1037 "Be verbose (can be specified more than once)",
1038 "Use specified format for output",
1039 "Read input stream from a filename",
1040 "Write output stream to a filename",
1041 "Don't display the header",
1042 "Print this help and exit",
1043 "Print version and exit",
1044 NULL
1045 };
1046
1047 /* display usage and exit */
1048 static void usage(int status)
1049 {
1050 unsigned long i;
1051 printf("* Scan ELF binaries for stuff\n\n"
1052 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1053 printf("Options: -[%s]\n", PARSE_FLAGS);
1054 for (i = 0; long_opts[i].name; ++i)
1055 if (long_opts[i].has_arg == no_argument)
1056 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1057 long_opts[i].name, opts_help[i]);
1058 else
1059 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1060 long_opts[i].name, opts_help[i]);
1061
1062 if (status != EXIT_SUCCESS)
1063 exit(status);
1064
1065 puts("\nThe format modifiers for the -F option are:");
1066 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1067 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1068 puts(" i INTERP \tb BIND \ts symbol");
1069 puts(" N library \to Type \tT TEXTRELs");
1070 puts(" p filename (with search path removed)");
1071 puts(" f base filename");
1072 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1073
1074 exit(status);
1075 }
1076
1077 /* parse command line arguments and preform needed actions */
1078 static void parseargs(int argc, char *argv[])
1079 {
1080 int i;
1081 char *from_file = NULL;
1082
1083 opterr = 0;
1084 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1085 switch (i) {
1086
1087 case 'V':
1088 printf("pax-utils-%s: %s compiled %s\n%s\n"
1089 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1090 VERSION, __FILE__, __DATE__, rcsid, argv0);
1091 exit(EXIT_SUCCESS);
1092 break;
1093 case 'h': usage(EXIT_SUCCESS); break;
1094 case 'f':
1095 if (from_file) err("Don't specify -f twice");
1096 from_file = xstrdup(optarg);
1097 break;
1098 case 'o': {
1099 FILE *fp = NULL;
1100 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1101 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1102 SET_STDOUT(fp);
1103 break;
1104 }
1105
1106 case 's': {
1107 size_t len;
1108 if (find_sym) err("Don't specify -s twice");
1109 find_sym = xstrdup(optarg);
1110 len = strlen(find_sym) + 1;
1111 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1112 sprintf(versioned_symname, "%s@", find_sym);
1113 break;
1114 }
1115 case 'N': {
1116 if (find_lib) err("Don't specify -N twice");
1117 find_lib = xstrdup(optarg);
1118 break;
1119 }
1120
1121 case 'F': {
1122 if (out_format) err("Don't specify -F twice");
1123 out_format = xstrdup(optarg);
1124 break;
1125 }
1126
1127 case 'y': scan_symlink = 0; break;
1128 case 'B': show_banner = 0; break;
1129 case 'l': scan_ldpath = 1; break;
1130 case 'p': scan_envpath = 1; break;
1131 case 'R': dir_recurse = 1; break;
1132 case 'm': dir_crossmount = 0; break;
1133 case 'x': show_pax = 1; break;
1134 case 'e': show_phdr = 1; break;
1135 case 't': show_textrel = 1; break;
1136 case 'r': show_rpath = 1; break;
1137 case 'n': show_needed = 1; break;
1138 case 'i': show_interp = 1; break;
1139 case 'b': show_bind = 1; break;
1140 case 'S': show_soname = 1; break;
1141 case 'T': show_textrels = 1; break;
1142 case 'q': be_quiet = 1; break;
1143 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1144 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1145
1146 case ':':
1147 err("Option missing parameter\n");
1148 case '?':
1149 err("Unknown option\n");
1150 default:
1151 err("Unhandled option '%c'", i);
1152 }
1153 }
1154
1155 /* let the format option override all other options */
1156 if (out_format) {
1157 show_pax = show_phdr = show_textrel = show_rpath = \
1158 show_needed = show_interp = show_bind = show_soname = \
1159 show_textrels = 0;
1160 for (i = 0; out_format[i]; ++i) {
1161 if (!IS_MODIFIER(out_format[i])) continue;
1162
1163 switch (out_format[++i]) {
1164 case '%': break;
1165 case '#': break;
1166 case 'F': break;
1167 case 'p': break;
1168 case 'f': break;
1169 case 's': break;
1170 case 'N': break;
1171 case 'o': break;
1172 case 'x': show_pax = 1; break;
1173 case 'e': show_phdr = 1; break;
1174 case 't': show_textrel = 1; break;
1175 case 'r': show_rpath = 1; break;
1176 case 'n': show_needed = 1; break;
1177 case 'i': show_interp = 1; break;
1178 case 'b': show_bind = 1; break;
1179 case 'S': show_soname = 1; break;
1180 case 'T': show_textrels = 1; break;
1181 default:
1182 err("Invalid format specifier '%c' (byte %i)",
1183 out_format[i], i+1);
1184 }
1185 }
1186
1187 /* construct our default format */
1188 } else {
1189 size_t fmt_len = 30;
1190 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1191 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1192 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1193 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1194 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1195 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1196 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1197 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1198 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1199 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1200 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1201 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1202 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1203 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1204 }
1205 if (be_verbose > 2) printf("Format: %s\n", out_format);
1206
1207 /* now lets actually do the scanning */
1208 if (scan_ldpath || (show_rpath && be_quiet))
1209 load_ld_so_conf();
1210 if (scan_ldpath) scanelf_ldpath();
1211 if (scan_envpath) scanelf_envpath();
1212 if (from_file) {
1213 scanelf_from_file(from_file);
1214 free(from_file);
1215 from_file = *argv;
1216 }
1217 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1218 err("Nothing to scan !?");
1219 while (optind < argc) {
1220 search_path = argv[optind++];
1221 scanelf_dir(search_path);
1222 }
1223
1224 /* clean up */
1225 if (find_sym) {
1226 free(find_sym);
1227 free(versioned_symname);
1228 }
1229 if (find_lib) free(find_lib);
1230 if (out_format) free(out_format);
1231 for (i = 0; ldpaths[i]; ++i)
1232 free(ldpaths[i]);
1233 }
1234
1235
1236
1237 /* utility funcs */
1238 static char *xstrdup(const char *s)
1239 {
1240 char *ret = strdup(s);
1241 if (!ret) err("Could not strdup(): %s", strerror(errno));
1242 return ret;
1243 }
1244
1245 static void *xmalloc(size_t size)
1246 {
1247 void *ret = malloc(size);
1248 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1249 return ret;
1250 }
1251
1252 static void xstrcat(char **dst, const char *src, size_t *curr_len)
1253 {
1254 size_t new_len;
1255
1256 new_len = strlen(*dst) + strlen(src);
1257 if (*curr_len <= new_len) {
1258 *curr_len = new_len + (*curr_len / 2);
1259 *dst = realloc(*dst, *curr_len);
1260 if (!*dst)
1261 err("could not realloc %li bytes", (unsigned long)*curr_len);
1262 }
1263
1264 strcat(*dst, src);
1265 }
1266
1267 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1268 {
1269 static char my_app[2];
1270 my_app[0] = append;
1271 my_app[1] = '\0';
1272 xstrcat(dst, my_app, curr_len);
1273 }
1274
1275
1276
1277 int main(int argc, char *argv[])
1278 {
1279 if (argc < 2)
1280 usage(EXIT_FAILURE);
1281 parseargs(argc, argv);
1282 fclose(stdout);
1283 #ifdef __BOUNDS_CHECKING_ON
1284 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1285 #endif
1286 return EXIT_SUCCESS;
1287 }

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