/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.88 - (show annotations) (download) (as text)
Fri Sep 30 03:30:54 2005 UTC (8 years, 10 months ago) by vapier
Branch: MAIN
Changes since 1.87: +5 -4 lines
File MIME type: text/x-csrc
touchup output of TEXTREL matches and update the format help output

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/porting.h,v 1.3 2005/05/30 03:23:07 vapier Exp $
5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <sys/types.h>
13 #include <libgen.h>
14 #include <limits.h>
15 #define __USE_GNU
16 #include <string.h>
17 #include <errno.h>
18 #include <unistd.h>
19 #include <sys/stat.h>
20 #include <dirent.h>
21 #include <getopt.h>
22 #include <assert.h>
23 #include "paxelf.h"
24
25 static const char *rcsid = "$Id: scanelf.c,v 1.86 2005/09/24 16:17:53 solar Exp $";
26 #define argv0 "scanelf"
27
28 #define IS_MODIFIER(c) (c == '%' || c == '#')
29
30
31
32 /* prototypes */
33 static void scanelf_file(const char *filename);
34 static void scanelf_dir(const char *path);
35 static void scanelf_ldpath();
36 static void scanelf_envpath();
37 static void usage(int status);
38 static void parseargs(int argc, char *argv[]);
39 static char *xstrdup(const char *s);
40 static void *xmalloc(size_t size);
41 static void xstrcat(char **dst, const char *src, size_t *curr_len);
42 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
43
44 /* variables to control behavior */
45 static char *ldpaths[256];
46 static char scan_ldpath = 0;
47 static char scan_envpath = 0;
48 static char scan_symlink = 1;
49 static char dir_recurse = 0;
50 static char dir_crossmount = 1;
51 static char show_pax = 0;
52 static char show_phdr = 0;
53 static char show_textrel = 0;
54 static char show_rpath = 0;
55 static char show_needed = 0;
56 static char show_interp = 0;
57 static char show_bind = 0;
58 static char show_soname = 0;
59 static char show_textrels = 0;
60 static char show_banner = 1;
61 static char be_quiet = 0;
62 static char be_verbose = 0;
63 static char be_wewy_wewy_quiet = 0;
64 static char *find_sym = NULL, *versioned_symname = NULL;
65 static char *find_lib = NULL;
66 static char *out_format = NULL;
67 static char *search_path = NULL;
68 static char gmatch = 0;
69
70
71 /* sub-funcs for scanelf_file() */
72 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73 {
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
75 #define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
78 /* debug sections */ \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
81 /* runtime sections */ \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
84 if (symtab && dynsym) { \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
86 } else { \
87 *sym = (void*)(symtab ? symtab : dynsym); \
88 } \
89 if (strtab && dynstr) { \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
91 } else { \
92 *tab = (void*)(strtab ? strtab : dynstr); \
93 } \
94 }
95 GET_SYMTABS(32)
96 GET_SYMTABS(64)
97 }
98 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99 {
100 static char *paxflags;
101 static char ret[7];
102 unsigned long i, shown;
103
104 if (!show_pax) return NULL;
105
106 shown = 0;
107 memset(&ret, 0, sizeof(ret));
108
109 if (elf->phdr) {
110 #define SHOW_PAX(B) \
111 if (elf->elf_class == ELFCLASS ## B) { \
112 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
113 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
114 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
115 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
116 continue; \
117 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
118 continue; \
119 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
120 *found_pax = 1; \
121 ++shown; \
122 break; \
123 } \
124 }
125 SHOW_PAX(32)
126 SHOW_PAX(64)
127 }
128
129 /* fall back to EI_PAX if no PT_PAX was found */
130 if (!*ret) {
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1;
134 return paxflags;
135 }
136 strncpy(ret, paxflags, sizeof(ret));
137 }
138
139 if (be_quiet && !shown)
140 return NULL;
141 return ret;
142
143 }
144 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
145 {
146 static char ret[12];
147 char *found;
148 unsigned long i, off, shown, check_flags;
149 unsigned char multi_stack, multi_relro, multi_load;
150
151 if (!show_phdr) return NULL;
152
153 memcpy(ret, "--- --- ---\0", 12);
154
155 shown = 0;
156 multi_stack = multi_relro = multi_load = 0;
157
158 if (elf->phdr) {
159 #define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 uint32_t flags; \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
165 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
166 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
167 found = found_phdr; \
168 off = 0; \
169 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
171 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
172 found = found_relro; \
173 off = 4; \
174 check_flags = PF_X; \
175 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
176 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
177 found = found_load; \
178 off = 8; \
179 check_flags = PF_W|PF_X; \
180 } else \
181 continue; \
182 flags = EGET(phdr[i].p_flags); \
183 if (be_quiet && ((flags & check_flags) != check_flags)) \
184 continue; \
185 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \
186 *found = 1; \
187 ++shown; \
188 } \
189 }
190 SHOW_PHDR(32)
191 SHOW_PHDR(64)
192 }
193
194 if (be_quiet && !shown)
195 return NULL;
196 else
197 return ret;
198 }
199 static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
200 {
201 static char ret[] = "TEXTREL";
202 unsigned long i;
203
204 if (!show_textrel && !show_textrels) return NULL;
205
206 if (elf->phdr) {
207 #define SHOW_TEXTREL(B) \
208 if (elf->elf_class == ELFCLASS ## B) { \
209 Elf ## B ## _Dyn *dyn; \
210 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
211 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
212 Elf ## B ## _Off offset; \
213 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
214 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
215 offset = EGET(phdr[i].p_offset); \
216 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
217 dyn = DYN ## B (elf->data + offset); \
218 while (EGET(dyn->d_tag) != DT_NULL) { \
219 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
220 *found_textrel = 1; \
221 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
222 return (be_wewy_wewy_quiet ? NULL : ret); \
223 } \
224 ++dyn; \
225 } \
226 } }
227 SHOW_TEXTREL(32)
228 SHOW_TEXTREL(64)
229 }
230
231 if (be_quiet || be_wewy_wewy_quiet)
232 return NULL;
233 else
234 return (char *)" - ";
235 }
236 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
237 {
238 unsigned long s, r, rmax;
239 void *symtab_void, *strtab_void, *text_void;
240
241 if (!show_textrels) return NULL;
242
243 /* don't search for TEXTREL's if the ELF doesn't have any */
244 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
245 if (!*found_textrel) return NULL;
246
247 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
248 text_void = elf_findsecbyname(elf, ".text");
249
250 if (symtab_void && strtab_void && text_void && elf->shdr) {
251 #define SHOW_TEXTRELS(B) \
252 if (elf->elf_class == ELFCLASS ## B) { \
253 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
254 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
255 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
256 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
257 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
258 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
259 uint ## B ## _t memsz = EGET(text->sh_size); \
260 Elf ## B ## _Rel *rel; \
261 Elf ## B ## _Rela *rela; \
262 /* search the section headers for relocations */ \
263 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
264 uint32_t sh_type = EGET(shdr[s].sh_type); \
265 if (sh_type == SHT_REL) { \
266 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
267 rela = NULL; \
268 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
269 } else if (sh_type == SHT_RELA) { \
270 rel = NULL; \
271 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
272 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
273 } else \
274 continue; \
275 /* now see if any of the relocs are in the .text */ \
276 for (r = 0; r < rmax; ++r) { \
277 unsigned long sym_max; \
278 Elf ## B ## _Addr offset_tmp; \
279 Elf ## B ## _Sym *func; \
280 Elf ## B ## _Sym *sym; \
281 Elf ## B ## _Addr r_offset; \
282 uint ## B ## _t r_info; \
283 if (sh_type == SHT_REL) { \
284 r_offset = EGET(rel[r].r_offset); \
285 r_info = EGET(rel[r].r_info); \
286 } else { \
287 r_offset = EGET(rela[r].r_offset); \
288 r_info = EGET(rela[r].r_info); \
289 } \
290 /* make sure this relocation is inside of the .text */ \
291 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
292 if (be_verbose <= 2) continue; \
293 } else \
294 *found_textrels = 1; \
295 /* locate this relocation symbol name */ \
296 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
297 sym_max = ELF ## B ## _R_SYM(r_info); \
298 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
299 sym += sym_max; \
300 else \
301 sym = NULL; \
302 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
303 /* show the raw details about this reloc */ \
304 printf(" %s: ", elf->base_filename); \
305 if (sym && sym->st_name) \
306 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
307 else \
308 printf("(memory/fake?)"); \
309 printf(" [0x%lX]", (unsigned long)r_offset); \
310 /* now try to find the closest symbol that this rel is probably in */ \
311 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
312 func = NULL; \
313 offset_tmp = 0; \
314 while (sym_max--) { \
315 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
316 func = sym; \
317 offset_tmp = EGET(sym->st_value); \
318 } \
319 ++sym; \
320 } \
321 printf(" in "); \
322 if (func && func->st_name) \
323 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
324 else \
325 printf("(NULL: fake?)"); \
326 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
327 } \
328 } }
329 SHOW_TEXTRELS(32)
330 SHOW_TEXTRELS(64)
331 }
332 if (!*found_textrels)
333 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
334
335 return NULL;
336 }
337
338 static void rpath_security_checks(elfobj *, char *);
339 static void rpath_security_checks(elfobj *elf, char *item) {
340 struct stat st;
341 switch (*item) {
342 case 0:
343 warnf("Security problem NULL RPATH in %s", elf->filename);
344 break;
345 case '/': break;
346 case '$':
347 if (fstat(elf->fd, &st) != -1)
348 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
349 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
350 item, elf->filename, st.st_mode & 07777);
351 break;
352 default:
353 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
354 break;
355 }
356 }
357 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
358 {
359 unsigned long i, s;
360 char *rpath, *runpath, **r;
361 void *strtbl_void;
362
363 if (!show_rpath) return;
364
365 strtbl_void = elf_findsecbyname(elf, ".dynstr");
366 rpath = runpath = NULL;
367
368 if (elf->phdr && strtbl_void) {
369 #define SHOW_RPATH(B) \
370 if (elf->elf_class == ELFCLASS ## B) { \
371 Elf ## B ## _Dyn *dyn; \
372 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
373 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
374 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
375 Elf ## B ## _Off offset; \
376 Elf ## B ## _Xword word; \
377 /* Scan all the program headers */ \
378 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
379 /* Just scan dynamic headers */ \
380 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
381 offset = EGET(phdr[i].p_offset); \
382 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
383 /* Just scan dynamic RPATH/RUNPATH headers */ \
384 dyn = DYN ## B (elf->data + offset); \
385 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
386 if (word == DT_RPATH) { \
387 r = &rpath; \
388 } else if (word == DT_RUNPATH) { \
389 r = &runpath; \
390 } else { \
391 ++dyn; \
392 continue; \
393 } \
394 /* Verify the memory is somewhat sane */ \
395 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
396 if (offset < (Elf ## B ## _Off)elf->len) { \
397 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
398 *r = (char*)(elf->data + offset); \
399 /* If quiet, don't output paths in ld.so.conf */ \
400 if (be_quiet) { \
401 size_t len; \
402 char *start, *end; \
403 /* note that we only 'chop' off leading known paths. */ \
404 /* since *r is read-only memory, we can only move the ptr forward. */ \
405 start = *r; \
406 /* scan each path in : delimited list */ \
407 while (start) { \
408 rpath_security_checks(elf, start); \
409 end = strchr(start, ':'); \
410 len = (end ? abs(end - start) : strlen(start)); \
411 for (s = 0; ldpaths[s]; ++s) { \
412 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
413 *r = (end ? end + 1 : NULL); \
414 break; \
415 } \
416 } \
417 if (!*r || !ldpaths[s] || !end) \
418 start = NULL; \
419 else \
420 start = start + len + 1; \
421 } \
422 } \
423 if (*r) *found_rpath = 1; \
424 } \
425 ++dyn; \
426 } \
427 } }
428 SHOW_RPATH(32)
429 SHOW_RPATH(64)
430 }
431
432 if (be_wewy_wewy_quiet) return;
433
434 if (rpath && runpath) {
435 if (!strcmp(rpath, runpath)) {
436 xstrcat(ret, runpath, ret_len);
437 } else {
438 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
439 xchrcat(ret, '{', ret_len);
440 xstrcat(ret, rpath, ret_len);
441 xchrcat(ret, ',', ret_len);
442 xstrcat(ret, runpath, ret_len);
443 xchrcat(ret, '}', ret_len);
444 }
445 } else if (rpath || runpath)
446 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
447 else if (!be_quiet)
448 xstrcat(ret, " - ", ret_len);
449 }
450 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
451 {
452 unsigned long i;
453 char *needed;
454 void *strtbl_void;
455
456 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
457
458 strtbl_void = elf_findsecbyname(elf, ".dynstr");
459
460 if (elf->phdr && strtbl_void) {
461 #define SHOW_NEEDED(B) \
462 if (elf->elf_class == ELFCLASS ## B) { \
463 Elf ## B ## _Dyn *dyn; \
464 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
465 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
466 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
467 Elf ## B ## _Off offset; \
468 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
469 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
470 offset = EGET(phdr[i].p_offset); \
471 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
472 dyn = DYN ## B (elf->data + offset); \
473 while (EGET(dyn->d_tag) != DT_NULL) { \
474 if (EGET(dyn->d_tag) == DT_NEEDED) { \
475 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
476 if (offset >= (Elf ## B ## _Off)elf->len) { \
477 ++dyn; \
478 continue; \
479 } \
480 needed = (char*)(elf->data + offset); \
481 if (op == 0) { \
482 if (!be_wewy_wewy_quiet) { \
483 if (*found_needed) xchrcat(ret, ',', ret_len); \
484 xstrcat(ret, needed, ret_len); \
485 } \
486 *found_needed = 1; \
487 } else { \
488 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
489 *found_lib = 1; \
490 return (be_wewy_wewy_quiet ? NULL : needed); \
491 } \
492 } \
493 } \
494 ++dyn; \
495 } \
496 } }
497 SHOW_NEEDED(32)
498 SHOW_NEEDED(64)
499 if (op == 0 && !*found_needed && be_verbose)
500 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
501 }
502
503 return NULL;
504 }
505 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
506 {
507 void *strtbl_void;
508
509 if (!show_interp) return NULL;
510
511 strtbl_void = elf_findsecbyname(elf, ".interp");
512
513 if (strtbl_void) {
514 #define SHOW_INTERP(B) \
515 if (elf->elf_class == ELFCLASS ## B) { \
516 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
517 *found_interp = 1; \
518 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
519 }
520 SHOW_INTERP(32)
521 SHOW_INTERP(64)
522 }
523 return NULL;
524 }
525 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
526 {
527 unsigned long i;
528 struct stat s;
529
530 if (!show_bind) return NULL;
531 if (!elf->phdr) return NULL;
532
533 #define SHOW_BIND(B) \
534 if (elf->elf_class == ELFCLASS ## B) { \
535 Elf ## B ## _Dyn *dyn; \
536 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
537 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
538 Elf ## B ## _Off offset; \
539 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
540 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
541 offset = EGET(phdr[i].p_offset); \
542 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
543 dyn = DYN ## B (elf->data + offset); \
544 while (EGET(dyn->d_tag) != DT_NULL) { \
545 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
546 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
547 { \
548 if (be_quiet) return NULL; \
549 *found_bind = 1; \
550 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
551 } \
552 ++dyn; \
553 } \
554 } \
555 }
556 SHOW_BIND(32)
557 SHOW_BIND(64)
558
559 if (be_wewy_wewy_quiet) return NULL;
560
561 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
562 return NULL;
563 } else {
564 *found_bind = 1;
565 return (char *) "LAZY";
566 }
567 }
568 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
569 {
570 unsigned long i;
571 char *soname;
572 void *strtbl_void;
573
574 if (!show_soname) return NULL;
575
576 strtbl_void = elf_findsecbyname(elf, ".dynstr");
577
578 if (elf->phdr && strtbl_void) {
579 #define SHOW_SONAME(B) \
580 if (elf->elf_class == ELFCLASS ## B) { \
581 Elf ## B ## _Dyn *dyn; \
582 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
583 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
584 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
585 Elf ## B ## _Off offset; \
586 /* only look for soname in shared objects */ \
587 if (ehdr->e_type != ET_DYN) \
588 return NULL; \
589 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
590 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
591 offset = EGET(phdr[i].p_offset); \
592 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
593 dyn = DYN ## B (elf->data + offset); \
594 while (EGET(dyn->d_tag) != DT_NULL) { \
595 if (EGET(dyn->d_tag) == DT_SONAME) { \
596 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
597 if (offset >= (Elf ## B ## _Off)elf->len) { \
598 ++dyn; \
599 continue; \
600 } \
601 soname = (char*)(elf->data + offset); \
602 *found_soname = 1; \
603 return (be_wewy_wewy_quiet ? NULL : soname); \
604 } \
605 ++dyn; \
606 } \
607 } }
608 SHOW_SONAME(32)
609 SHOW_SONAME(64)
610 }
611
612 return NULL;
613 }
614 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
615 {
616 unsigned long i;
617 void *symtab_void, *strtab_void;
618
619 if (!find_sym) return NULL;
620
621 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
622
623 if (symtab_void && strtab_void) {
624 #define FIND_SYM(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
627 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
628 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
629 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
630 char *symname; \
631 for (i = 0; i < cnt; ++i) { \
632 if (sym->st_name) { \
633 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
634 if (*find_sym == '*') { \
635 printf("%s(%s) %5lX %15s %s\n", \
636 ((*found_sym == 0) ? "\n\t" : "\t"), \
637 elf->base_filename, \
638 (long)sym->st_size, \
639 (char *)get_elfstttype(sym->st_info), \
640 symname); \
641 *found_sym = 1; \
642 } else if ((strcmp(find_sym, symname) == 0) || \
643 (strcmp(symname, versioned_symname) == 0)) \
644 (*found_sym)++; \
645 } \
646 ++sym; \
647 } }
648 FIND_SYM(32)
649 FIND_SYM(64)
650 }
651
652 if (be_wewy_wewy_quiet) return NULL;
653
654 if (*find_sym != '*' && *found_sym)
655 return find_sym;
656 if (be_quiet)
657 return NULL;
658 else
659 return (char *)" - ";
660 }
661 /* scan an elf file and show all the fun stuff */
662 #define prints(str) write(fileno(stdout), str, strlen(str))
663 static void scanelf_file(const char *filename)
664 {
665 unsigned long i;
666 char found_pax, found_phdr, found_relro, found_load, found_textrel,
667 found_rpath, found_needed, found_interp, found_bind, found_soname,
668 found_sym, found_lib, found_file, found_textrels;
669 elfobj *elf;
670 struct stat st;
671 static char *out_buffer = NULL;
672 static size_t out_len;
673
674 /* make sure 'filename' exists */
675 if (lstat(filename, &st) == -1) {
676 if (be_verbose > 2) printf("%s: does not exist\n", filename);
677 return;
678 }
679 /* always handle regular files and handle symlinked files if no -y */
680 if (S_ISLNK(st.st_mode)) {
681 if (!scan_symlink) return;
682 stat(filename, &st);
683 }
684 if (!S_ISREG(st.st_mode)) {
685 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
686 return;
687 }
688
689 found_pax = found_phdr = found_relro = found_load = found_textrel = \
690 found_rpath = found_needed = found_interp = found_bind = found_soname = \
691 found_sym = found_lib = found_file = found_textrels = 0;
692
693 /* verify this is real ELF */
694 if ((elf = readelf(filename)) == NULL) {
695 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
696 return;
697 }
698
699 if (be_verbose > 1)
700 printf("%s: scanning file {%s,%s}\n", filename,
701 get_elfeitype(EI_CLASS, elf->elf_class),
702 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
703 else if (be_verbose)
704 printf("%s: scanning file\n", filename);
705
706 /* init output buffer */
707 if (!out_buffer) {
708 out_len = sizeof(char) * 80;
709 out_buffer = (char*)xmalloc(out_len);
710 }
711 *out_buffer = '\0';
712
713 /* show the header */
714 if (!be_quiet && show_banner) {
715 for (i = 0; out_format[i]; ++i) {
716 if (!IS_MODIFIER(out_format[i])) continue;
717
718 switch (out_format[++i]) {
719 case '%': break;
720 case '#': break;
721 case 'F':
722 case 'p':
723 case 'f': prints("FILE "); found_file = 1; break;
724 case 'o': prints(" TYPE "); break;
725 case 'x': prints(" PAX "); break;
726 case 'e': prints("STK/REL/PTL "); break;
727 case 't': prints("TEXTREL "); break;
728 case 'r': prints("RPATH "); break;
729 case 'n': prints("NEEDED "); break;
730 case 'i': prints("INTERP "); break;
731 case 'b': prints("BIND "); break;
732 case 'S': prints("SONAME "); break;
733 case 's': prints("SYM "); break;
734 case 'N': prints("LIB "); break;
735 case 'T': prints("TEXTRELS "); break;
736 default: warnf("'%c' has no title ?", out_format[i]);
737 }
738 }
739 if (!found_file) prints("FILE ");
740 prints("\n");
741 found_file = 0;
742 show_banner = 0;
743 }
744
745 /* dump all the good stuff */
746 for (i = 0; out_format[i]; ++i) {
747 const char *out;
748 const char *tmp;
749
750 /* make sure we trim leading spaces in quiet mode */
751 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
752 *out_buffer = '\0';
753
754 if (!IS_MODIFIER(out_format[i])) {
755 xchrcat(&out_buffer, out_format[i], &out_len);
756 continue;
757 }
758
759 out = NULL;
760 be_wewy_wewy_quiet = (out_format[i] == '#');
761 switch (out_format[++i]) {
762 case '%':
763 case '#':
764 xchrcat(&out_buffer, out_format[i], &out_len); break;
765 case 'F':
766 found_file = 1;
767 if (be_wewy_wewy_quiet) break;
768 xstrcat(&out_buffer, filename, &out_len);
769 break;
770 case 'p':
771 found_file = 1;
772 if (be_wewy_wewy_quiet) break;
773 tmp = filename;
774 if (search_path) {
775 ssize_t len_search = strlen(search_path);
776 ssize_t len_file = strlen(filename);
777 if (!strncmp(filename, search_path, len_search) && \
778 len_file > len_search)
779 tmp += len_search;
780 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
781 }
782 xstrcat(&out_buffer, tmp, &out_len);
783 break;
784 case 'f':
785 found_file = 1;
786 if (be_wewy_wewy_quiet) break;
787 tmp = strrchr(filename, '/');
788 tmp = (tmp == NULL ? filename : tmp+1);
789 xstrcat(&out_buffer, tmp, &out_len);
790 break;
791 case 'o': out = get_elfetype(elf); break;
792 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
793 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
794 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
795 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
796 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
797 case 'n':
798 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
799 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
800 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
801 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
802 case 's': out = scanelf_file_sym(elf, &found_sym); break;
803 default: warnf("'%c' has no scan code?", out_format[i]);
804 }
805 if (out) xstrcat(&out_buffer, out, &out_len);
806 }
807
808 #define FOUND_SOMETHING() \
809 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
810 found_rpath || found_needed || found_interp || found_bind || \
811 found_soname || found_sym || found_lib || found_textrels)
812
813 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
814 xchrcat(&out_buffer, ' ', &out_len);
815 xstrcat(&out_buffer, filename, &out_len);
816 }
817 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
818 puts(out_buffer);
819 fflush(stdout);
820 }
821
822 unreadelf(elf);
823 }
824
825 /* scan a directory for ET_EXEC files and print when we find one */
826 static void scanelf_dir(const char *path)
827 {
828 register DIR *dir;
829 register struct dirent *dentry;
830 struct stat st_top, st;
831 char buf[_POSIX_PATH_MAX];
832 size_t pathlen = 0, len = 0;
833
834 /* make sure path exists */
835 if (lstat(path, &st_top) == -1) {
836 if (be_verbose > 2) printf("%s: does not exist\n", path);
837 return;
838 }
839
840 /* ok, if it isn't a directory, assume we can open it */
841 if (!S_ISDIR(st_top.st_mode)) {
842 scanelf_file(path);
843 return;
844 }
845
846 /* now scan the dir looking for fun stuff */
847 if ((dir = opendir(path)) == NULL) {
848 warnf("could not opendir %s: %s", path, strerror(errno));
849 return;
850 }
851 if (be_verbose) printf("%s: scanning dir\n", path);
852
853 pathlen = strlen(path);
854 while ((dentry = readdir(dir))) {
855 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
856 continue;
857 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
858 if (len >= sizeof(buf)) {
859 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
860 (unsigned long)len, (unsigned long)sizeof(buf));
861 continue;
862 }
863 sprintf(buf, "%s/%s", path, dentry->d_name);
864 if (lstat(buf, &st) != -1) {
865 if (S_ISREG(st.st_mode))
866 scanelf_file(buf);
867 else if (dir_recurse && S_ISDIR(st.st_mode)) {
868 if (dir_crossmount || (st_top.st_dev == st.st_dev))
869 scanelf_dir(buf);
870 }
871 }
872 }
873 closedir(dir);
874 }
875
876 static int scanelf_from_file(char *filename)
877 {
878 FILE *fp = NULL;
879 char *p;
880 char path[_POSIX_PATH_MAX];
881
882 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
883 fp = stdin;
884 else if ((fp = fopen(filename, "r")) == NULL)
885 return 1;
886
887 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
888 if ((p = strchr(path, '\n')) != NULL)
889 *p = 0;
890 search_path = path;
891 scanelf_dir(path);
892 }
893 if (fp != stdin)
894 fclose(fp);
895 return 0;
896 }
897
898 static void load_ld_so_conf()
899 {
900 FILE *fp = NULL;
901 char *p;
902 char path[_POSIX_PATH_MAX];
903 int i = 0;
904
905 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
906 return;
907
908 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
909 if (*path != '/')
910 continue;
911
912 if ((p = strrchr(path, '\r')) != NULL)
913 *p = 0;
914 if ((p = strchr(path, '\n')) != NULL)
915 *p = 0;
916
917 ldpaths[i++] = xstrdup(path);
918
919 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
920 break;
921 }
922 ldpaths[i] = NULL;
923
924 fclose(fp);
925 }
926
927 /* scan /etc/ld.so.conf for paths */
928 static void scanelf_ldpath()
929 {
930 char scan_l, scan_ul, scan_ull;
931 int i = 0;
932
933 if (!ldpaths[0])
934 err("Unable to load any paths from ld.so.conf");
935
936 scan_l = scan_ul = scan_ull = 0;
937
938 while (ldpaths[i]) {
939 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
940 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
941 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
942 scanelf_dir(ldpaths[i]);
943 ++i;
944 }
945
946 if (!scan_l) scanelf_dir("/lib");
947 if (!scan_ul) scanelf_dir("/usr/lib");
948 if (!scan_ull) scanelf_dir("/usr/local/lib");
949 }
950
951 /* scan env PATH for paths */
952 static void scanelf_envpath()
953 {
954 char *path, *p;
955
956 path = getenv("PATH");
957 if (!path)
958 err("PATH is not set in your env !");
959 path = xstrdup(path);
960
961 while ((p = strrchr(path, ':')) != NULL) {
962 scanelf_dir(p + 1);
963 *p = 0;
964 }
965
966 free(path);
967 }
968
969
970
971 /* usage / invocation handling functions */
972 #define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV"
973 #define a_argument required_argument
974 static struct option const long_opts[] = {
975 {"path", no_argument, NULL, 'p'},
976 {"ldpath", no_argument, NULL, 'l'},
977 {"recursive", no_argument, NULL, 'R'},
978 {"mount", no_argument, NULL, 'm'},
979 {"symlink", no_argument, NULL, 'y'},
980 {"pax", no_argument, NULL, 'x'},
981 {"header", no_argument, NULL, 'e'},
982 {"textrel", no_argument, NULL, 't'},
983 {"rpath", no_argument, NULL, 'r'},
984 {"needed", no_argument, NULL, 'n'},
985 {"interp", no_argument, NULL, 'i'},
986 {"bind", no_argument, NULL, 'b'},
987 {"soname", no_argument, NULL, 'S'},
988 {"symbol", a_argument, NULL, 's'},
989 {"lib", a_argument, NULL, 'N'},
990 {"gmatch", no_argument, NULL, 'g'},
991 {"textrels", no_argument, NULL, 'T'},
992 {"all", no_argument, NULL, 'a'},
993 {"quiet", no_argument, NULL, 'q'},
994 {"verbose", no_argument, NULL, 'v'},
995 {"format", a_argument, NULL, 'F'},
996 {"from", a_argument, NULL, 'f'},
997 {"file", a_argument, NULL, 'o'},
998 {"nobanner", no_argument, NULL, 'B'},
999 {"help", no_argument, NULL, 'h'},
1000 {"version", no_argument, NULL, 'V'},
1001 {NULL, no_argument, NULL, 0x0}
1002 };
1003
1004 static const char *opts_help[] = {
1005 "Scan all directories in PATH environment",
1006 "Scan all directories in /etc/ld.so.conf",
1007 "Scan directories recursively",
1008 "Don't recursively cross mount points",
1009 "Don't scan symlinks\n",
1010 "Print PaX markings",
1011 "Print GNU_STACK/PT_LOAD markings",
1012 "Print TEXTREL information",
1013 "Print RPATH information",
1014 "Print NEEDED information",
1015 "Print INTERP information",
1016 "Print BIND information",
1017 "Print SONAME information",
1018 "Find a specified symbol",
1019 "Find a specified library",
1020 "Use strncmp to match libraries. (use with -N)",
1021 "Locate cause of TEXTREL",
1022 "Print all scanned info (-x -e -t -r -b)\n",
1023 "Only output 'bad' things",
1024 "Be verbose (can be specified more than once)",
1025 "Use specified format for output",
1026 "Read input stream from a filename",
1027 "Write output stream to a filename",
1028 "Don't display the header",
1029 "Print this help and exit",
1030 "Print version and exit",
1031 NULL
1032 };
1033
1034 /* display usage and exit */
1035 static void usage(int status)
1036 {
1037 unsigned long i;
1038 printf("* Scan ELF binaries for stuff\n\n"
1039 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1040 printf("Options: -[%s]\n", PARSE_FLAGS);
1041 for (i = 0; long_opts[i].name; ++i)
1042 if (long_opts[i].has_arg == no_argument)
1043 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1044 long_opts[i].name, opts_help[i]);
1045 else
1046 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]);
1048
1049 if (status != EXIT_SUCCESS)
1050 exit(status);
1051
1052 puts("\nThe format modifiers for the -F option are:");
1053 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1054 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1055 puts(" i INTERP \tb BIND \ts symbol");
1056 puts(" N library \to Type \tT TEXTRELs");
1057 puts(" S SONAME");
1058 puts(" p filename (with search path removed)");
1059 puts(" f filename (short name/basename)");
1060 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1061
1062 exit(status);
1063 }
1064
1065 /* parse command line arguments and preform needed actions */
1066 static void parseargs(int argc, char *argv[])
1067 {
1068 int i;
1069 char *from_file = NULL;
1070
1071 opterr = 0;
1072 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1073 switch (i) {
1074
1075 case 'V':
1076 printf("pax-utils-%s: %s compiled %s\n%s\n"
1077 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1078 VERSION, __FILE__, __DATE__, rcsid, argv0);
1079 exit(EXIT_SUCCESS);
1080 break;
1081 case 'h': usage(EXIT_SUCCESS); break;
1082 case 'f':
1083 if (from_file) err("Don't specify -f twice");
1084 from_file = xstrdup(optarg);
1085 break;
1086 case 'o': {
1087 FILE *fp = NULL;
1088 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1089 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1090 SET_STDOUT(fp);
1091 break;
1092 }
1093
1094 case 's': {
1095 size_t len;
1096 if (find_sym) err("Don't specify -s twice");
1097 find_sym = xstrdup(optarg);
1098 len = strlen(find_sym) + 1;
1099 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1100 sprintf(versioned_symname, "%s@", find_sym);
1101 break;
1102 }
1103 case 'N': {
1104 if (find_lib) err("Don't specify -N twice");
1105 find_lib = xstrdup(optarg);
1106 break;
1107 }
1108
1109 case 'F': {
1110 if (out_format) err("Don't specify -F twice");
1111 out_format = xstrdup(optarg);
1112 break;
1113 }
1114
1115 case 'g': gmatch = 1;
1116 case 'y': scan_symlink = 0; break;
1117 case 'B': show_banner = 0; break;
1118 case 'l': scan_ldpath = 1; break;
1119 case 'p': scan_envpath = 1; break;
1120 case 'R': dir_recurse = 1; break;
1121 case 'm': dir_crossmount = 0; break;
1122 case 'x': show_pax = 1; break;
1123 case 'e': show_phdr = 1; break;
1124 case 't': show_textrel = 1; break;
1125 case 'r': show_rpath = 1; break;
1126 case 'n': show_needed = 1; break;
1127 case 'i': show_interp = 1; break;
1128 case 'b': show_bind = 1; break;
1129 case 'S': show_soname = 1; break;
1130 case 'T': show_textrels = 1; break;
1131 case 'q': be_quiet = 1; break;
1132 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1133 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1134
1135 case ':':
1136 err("Option missing parameter\n");
1137 case '?':
1138 err("Unknown option\n");
1139 default:
1140 err("Unhandled option '%c'", i);
1141 }
1142 }
1143
1144 /* let the format option override all other options */
1145 if (out_format) {
1146 show_pax = show_phdr = show_textrel = show_rpath = \
1147 show_needed = show_interp = show_bind = show_soname = \
1148 show_textrels = 0;
1149 for (i = 0; out_format[i]; ++i) {
1150 if (!IS_MODIFIER(out_format[i])) continue;
1151
1152 switch (out_format[++i]) {
1153 case '%': break;
1154 case '#': break;
1155 case 'F': break;
1156 case 'p': break;
1157 case 'f': break;
1158 case 's': break;
1159 case 'N': break;
1160 case 'o': break;
1161 case 'x': show_pax = 1; break;
1162 case 'e': show_phdr = 1; break;
1163 case 't': show_textrel = 1; break;
1164 case 'r': show_rpath = 1; break;
1165 case 'n': show_needed = 1; break;
1166 case 'i': show_interp = 1; break;
1167 case 'b': show_bind = 1; break;
1168 case 'S': show_soname = 1; break;
1169 case 'T': show_textrels = 1; break;
1170 default:
1171 err("Invalid format specifier '%c' (byte %i)",
1172 out_format[i], i+1);
1173 }
1174 }
1175
1176 /* construct our default format */
1177 } else {
1178 size_t fmt_len = 30;
1179 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1180 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1181 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1182 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1183 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1184 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1185 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1186 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1187 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1188 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1189 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1190 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1191 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1192 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1193 }
1194 if (be_verbose > 2) printf("Format: %s\n", out_format);
1195
1196 /* now lets actually do the scanning */
1197 if (scan_ldpath || (show_rpath && be_quiet))
1198 load_ld_so_conf();
1199 if (scan_ldpath) scanelf_ldpath();
1200 if (scan_envpath) scanelf_envpath();
1201 if (from_file) {
1202 scanelf_from_file(from_file);
1203 free(from_file);
1204 from_file = *argv;
1205 }
1206 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1207 err("Nothing to scan !?");
1208 while (optind < argc) {
1209 search_path = argv[optind++];
1210 scanelf_dir(search_path);
1211 }
1212
1213 /* clean up */
1214 if (find_sym) {
1215 free(find_sym);
1216 free(versioned_symname);
1217 }
1218 if (find_lib) free(find_lib);
1219 if (out_format) free(out_format);
1220 for (i = 0; ldpaths[i]; ++i)
1221 free(ldpaths[i]);
1222 }
1223
1224
1225
1226 /* utility funcs */
1227 static char *xstrdup(const char *s)
1228 {
1229 char *ret = strdup(s);
1230 if (!ret) err("Could not strdup(): %s", strerror(errno));
1231 return ret;
1232 }
1233
1234 static void *xmalloc(size_t size)
1235 {
1236 void *ret = malloc(size);
1237 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1238 return ret;
1239 }
1240
1241 static void xstrcat(char **dst, const char *src, size_t *curr_len)
1242 {
1243 size_t new_len;
1244
1245 new_len = strlen(*dst) + strlen(src);
1246 if (*curr_len <= new_len) {
1247 *curr_len = new_len + (*curr_len / 2);
1248 *dst = realloc(*dst, *curr_len);
1249 if (!*dst)
1250 err("could not realloc %li bytes", (unsigned long)*curr_len);
1251 }
1252
1253 strcat(*dst, src);
1254 }
1255
1256 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1257 {
1258 static char my_app[2];
1259 my_app[0] = append;
1260 my_app[1] = '\0';
1261 xstrcat(dst, my_app, curr_len);
1262 }
1263
1264
1265
1266 int main(int argc, char *argv[])
1267 {
1268 if (argc < 2)
1269 usage(EXIT_FAILURE);
1270 parseargs(argc, argv);
1271 fclose(stdout);
1272 #ifdef __BOUNDS_CHECKING_ON
1273 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1274 #endif
1275 return EXIT_SUCCESS;
1276 }

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