/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.89 - (show annotations) (download) (as text)
Thu Oct 13 01:53:55 2005 UTC (8 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.88: +8 -5 lines
File MIME type: text/x-csrc
split common non-elf features into paxinc.[ch]

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 1.88 2005/09/30 03:30:54 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 "paxinc.h"
24
25 static const char *rcsid = "$Id: scanelf.c,v 1.88 2005/09/30 03:30:54 vapier 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 '/': break;
343 case '.':
344 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
345 break;
346 case '\0':
347 warnf("Security problem NULL RPATH in %s", elf->filename);
348 break;
349 case '$':
350 if (fstat(elf->fd, &st) != -1)
351 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
352 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
353 item, elf->filename, st.st_mode & 07777);
354 break;
355 default:
356 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
357 break;
358 }
359 }
360 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
361 {
362 unsigned long i, s;
363 char *rpath, *runpath, **r;
364 void *strtbl_void;
365
366 if (!show_rpath) return;
367
368 strtbl_void = elf_findsecbyname(elf, ".dynstr");
369 rpath = runpath = NULL;
370
371 if (elf->phdr && strtbl_void) {
372 #define SHOW_RPATH(B) \
373 if (elf->elf_class == ELFCLASS ## B) { \
374 Elf ## B ## _Dyn *dyn; \
375 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
376 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
377 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
378 Elf ## B ## _Off offset; \
379 Elf ## B ## _Xword word; \
380 /* Scan all the program headers */ \
381 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
382 /* Just scan dynamic headers */ \
383 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
384 offset = EGET(phdr[i].p_offset); \
385 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
386 /* Just scan dynamic RPATH/RUNPATH headers */ \
387 dyn = DYN ## B (elf->data + offset); \
388 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
389 if (word == DT_RPATH) { \
390 r = &rpath; \
391 } else if (word == DT_RUNPATH) { \
392 r = &runpath; \
393 } else { \
394 ++dyn; \
395 continue; \
396 } \
397 /* Verify the memory is somewhat sane */ \
398 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
399 if (offset < (Elf ## B ## _Off)elf->len) { \
400 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
401 *r = (char*)(elf->data + offset); \
402 /* If quiet, don't output paths in ld.so.conf */ \
403 if (be_quiet) { \
404 size_t len; \
405 char *start, *end; \
406 /* note that we only 'chop' off leading known paths. */ \
407 /* since *r is read-only memory, we can only move the ptr forward. */ \
408 start = *r; \
409 /* scan each path in : delimited list */ \
410 while (start) { \
411 rpath_security_checks(elf, start); \
412 end = strchr(start, ':'); \
413 len = (end ? abs(end - start) : strlen(start)); \
414 for (s = 0; ldpaths[s]; ++s) { \
415 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
416 *r = (end ? end + 1 : NULL); \
417 break; \
418 } \
419 } \
420 if (!*r || !ldpaths[s] || !end) \
421 start = NULL; \
422 else \
423 start = start + len + 1; \
424 } \
425 } \
426 if (*r) *found_rpath = 1; \
427 } \
428 ++dyn; \
429 } \
430 } }
431 SHOW_RPATH(32)
432 SHOW_RPATH(64)
433 }
434
435 if (be_wewy_wewy_quiet) return;
436
437 if (rpath && runpath) {
438 if (!strcmp(rpath, runpath)) {
439 xstrcat(ret, runpath, ret_len);
440 } else {
441 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
442 xchrcat(ret, '{', ret_len);
443 xstrcat(ret, rpath, ret_len);
444 xchrcat(ret, ',', ret_len);
445 xstrcat(ret, runpath, ret_len);
446 xchrcat(ret, '}', ret_len);
447 }
448 } else if (rpath || runpath)
449 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
450 else if (!be_quiet)
451 xstrcat(ret, " - ", ret_len);
452 }
453 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
454 {
455 unsigned long i;
456 char *needed;
457 void *strtbl_void;
458
459 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
460
461 strtbl_void = elf_findsecbyname(elf, ".dynstr");
462
463 if (elf->phdr && strtbl_void) {
464 #define SHOW_NEEDED(B) \
465 if (elf->elf_class == ELFCLASS ## B) { \
466 Elf ## B ## _Dyn *dyn; \
467 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
468 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
469 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
470 Elf ## B ## _Off offset; \
471 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
472 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
473 offset = EGET(phdr[i].p_offset); \
474 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
475 dyn = DYN ## B (elf->data + offset); \
476 while (EGET(dyn->d_tag) != DT_NULL) { \
477 if (EGET(dyn->d_tag) == DT_NEEDED) { \
478 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
479 if (offset >= (Elf ## B ## _Off)elf->len) { \
480 ++dyn; \
481 continue; \
482 } \
483 needed = (char*)(elf->data + offset); \
484 if (op == 0) { \
485 if (!be_wewy_wewy_quiet) { \
486 if (*found_needed) xchrcat(ret, ',', ret_len); \
487 xstrcat(ret, needed, ret_len); \
488 } \
489 *found_needed = 1; \
490 } else { \
491 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
492 *found_lib = 1; \
493 return (be_wewy_wewy_quiet ? NULL : needed); \
494 } \
495 } \
496 } \
497 ++dyn; \
498 } \
499 } }
500 SHOW_NEEDED(32)
501 SHOW_NEEDED(64)
502 if (op == 0 && !*found_needed && be_verbose)
503 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
504 }
505
506 return NULL;
507 }
508 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
509 {
510 void *strtbl_void;
511
512 if (!show_interp) return NULL;
513
514 strtbl_void = elf_findsecbyname(elf, ".interp");
515
516 if (strtbl_void) {
517 #define SHOW_INTERP(B) \
518 if (elf->elf_class == ELFCLASS ## B) { \
519 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
520 *found_interp = 1; \
521 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
522 }
523 SHOW_INTERP(32)
524 SHOW_INTERP(64)
525 }
526 return NULL;
527 }
528 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
529 {
530 unsigned long i;
531 struct stat s;
532
533 if (!show_bind) return NULL;
534 if (!elf->phdr) return NULL;
535
536 #define SHOW_BIND(B) \
537 if (elf->elf_class == ELFCLASS ## B) { \
538 Elf ## B ## _Dyn *dyn; \
539 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
540 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
541 Elf ## B ## _Off offset; \
542 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
543 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
544 offset = EGET(phdr[i].p_offset); \
545 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
546 dyn = DYN ## B (elf->data + offset); \
547 while (EGET(dyn->d_tag) != DT_NULL) { \
548 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
549 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
550 { \
551 if (be_quiet) return NULL; \
552 *found_bind = 1; \
553 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
554 } \
555 ++dyn; \
556 } \
557 } \
558 }
559 SHOW_BIND(32)
560 SHOW_BIND(64)
561
562 if (be_wewy_wewy_quiet) return NULL;
563
564 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
565 return NULL;
566 } else {
567 *found_bind = 1;
568 return (char *) "LAZY";
569 }
570 }
571 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
572 {
573 unsigned long i;
574 char *soname;
575 void *strtbl_void;
576
577 if (!show_soname) return NULL;
578
579 strtbl_void = elf_findsecbyname(elf, ".dynstr");
580
581 if (elf->phdr && strtbl_void) {
582 #define SHOW_SONAME(B) \
583 if (elf->elf_class == ELFCLASS ## B) { \
584 Elf ## B ## _Dyn *dyn; \
585 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
586 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
587 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
588 Elf ## B ## _Off offset; \
589 /* only look for soname in shared objects */ \
590 if (ehdr->e_type != ET_DYN) \
591 return NULL; \
592 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
593 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
594 offset = EGET(phdr[i].p_offset); \
595 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
596 dyn = DYN ## B (elf->data + offset); \
597 while (EGET(dyn->d_tag) != DT_NULL) { \
598 if (EGET(dyn->d_tag) == DT_SONAME) { \
599 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
600 if (offset >= (Elf ## B ## _Off)elf->len) { \
601 ++dyn; \
602 continue; \
603 } \
604 soname = (char*)(elf->data + offset); \
605 *found_soname = 1; \
606 return (be_wewy_wewy_quiet ? NULL : soname); \
607 } \
608 ++dyn; \
609 } \
610 } }
611 SHOW_SONAME(32)
612 SHOW_SONAME(64)
613 }
614
615 return NULL;
616 }
617 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
618 {
619 unsigned long i;
620 void *symtab_void, *strtab_void;
621
622 if (!find_sym) return NULL;
623
624 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
625
626 if (symtab_void && strtab_void) {
627 #define FIND_SYM(B) \
628 if (elf->elf_class == ELFCLASS ## B) { \
629 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
630 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
631 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
632 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
633 char *symname; \
634 for (i = 0; i < cnt; ++i) { \
635 if (sym->st_name) { \
636 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
637 if (*find_sym == '*') { \
638 printf("%s(%s) %5lX %15s %s\n", \
639 ((*found_sym == 0) ? "\n\t" : "\t"), \
640 elf->base_filename, \
641 (long)sym->st_size, \
642 (char *)get_elfstttype(sym->st_info), \
643 symname); \
644 *found_sym = 1; \
645 } else if ((strcmp(find_sym, symname) == 0) || \
646 (strcmp(symname, versioned_symname) == 0)) \
647 (*found_sym)++; \
648 } \
649 ++sym; \
650 } }
651 FIND_SYM(32)
652 FIND_SYM(64)
653 }
654
655 if (be_wewy_wewy_quiet) return NULL;
656
657 if (*find_sym != '*' && *found_sym)
658 return find_sym;
659 if (be_quiet)
660 return NULL;
661 else
662 return (char *)" - ";
663 }
664 /* scan an elf file and show all the fun stuff */
665 #define prints(str) write(fileno(stdout), str, strlen(str))
666 static void scanelf_file(const char *filename)
667 {
668 unsigned long i;
669 char found_pax, found_phdr, found_relro, found_load, found_textrel,
670 found_rpath, found_needed, found_interp, found_bind, found_soname,
671 found_sym, found_lib, found_file, found_textrels;
672 elfobj *elf;
673 struct stat st;
674 static char *out_buffer = NULL;
675 static size_t out_len;
676
677 /* make sure 'filename' exists */
678 if (lstat(filename, &st) == -1) {
679 if (be_verbose > 2) printf("%s: does not exist\n", filename);
680 return;
681 }
682 /* always handle regular files and handle symlinked files if no -y */
683 if (S_ISLNK(st.st_mode)) {
684 if (!scan_symlink) return;
685 stat(filename, &st);
686 }
687 if (!S_ISREG(st.st_mode)) {
688 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
689 return;
690 }
691
692 found_pax = found_phdr = found_relro = found_load = found_textrel = \
693 found_rpath = found_needed = found_interp = found_bind = found_soname = \
694 found_sym = found_lib = found_file = found_textrels = 0;
695
696 /* verify this is real ELF */
697 if ((elf = readelf(filename)) == NULL) {
698 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
699 return;
700 }
701
702 if (be_verbose > 1)
703 printf("%s: scanning file {%s,%s}\n", filename,
704 get_elfeitype(EI_CLASS, elf->elf_class),
705 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
706 else if (be_verbose)
707 printf("%s: scanning file\n", filename);
708
709 /* init output buffer */
710 if (!out_buffer) {
711 out_len = sizeof(char) * 80;
712 out_buffer = (char*)xmalloc(out_len);
713 }
714 *out_buffer = '\0';
715
716 /* show the header */
717 if (!be_quiet && show_banner) {
718 for (i = 0; out_format[i]; ++i) {
719 if (!IS_MODIFIER(out_format[i])) continue;
720
721 switch (out_format[++i]) {
722 case '%': break;
723 case '#': break;
724 case 'F':
725 case 'p':
726 case 'f': prints("FILE "); found_file = 1; break;
727 case 'o': prints(" TYPE "); break;
728 case 'x': prints(" PAX "); break;
729 case 'e': prints("STK/REL/PTL "); break;
730 case 't': prints("TEXTREL "); break;
731 case 'r': prints("RPATH "); break;
732 case 'n': prints("NEEDED "); break;
733 case 'i': prints("INTERP "); break;
734 case 'b': prints("BIND "); break;
735 case 'S': prints("SONAME "); break;
736 case 's': prints("SYM "); break;
737 case 'N': prints("LIB "); break;
738 case 'T': prints("TEXTRELS "); break;
739 default: warnf("'%c' has no title ?", out_format[i]);
740 }
741 }
742 if (!found_file) prints("FILE ");
743 prints("\n");
744 found_file = 0;
745 show_banner = 0;
746 }
747
748 /* dump all the good stuff */
749 for (i = 0; out_format[i]; ++i) {
750 const char *out;
751 const char *tmp;
752
753 /* make sure we trim leading spaces in quiet mode */
754 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
755 *out_buffer = '\0';
756
757 if (!IS_MODIFIER(out_format[i])) {
758 xchrcat(&out_buffer, out_format[i], &out_len);
759 continue;
760 }
761
762 out = NULL;
763 be_wewy_wewy_quiet = (out_format[i] == '#');
764 switch (out_format[++i]) {
765 case '%':
766 case '#':
767 xchrcat(&out_buffer, out_format[i], &out_len); break;
768 case 'F':
769 found_file = 1;
770 if (be_wewy_wewy_quiet) break;
771 xstrcat(&out_buffer, filename, &out_len);
772 break;
773 case 'p':
774 found_file = 1;
775 if (be_wewy_wewy_quiet) break;
776 tmp = filename;
777 if (search_path) {
778 ssize_t len_search = strlen(search_path);
779 ssize_t len_file = strlen(filename);
780 if (!strncmp(filename, search_path, len_search) && \
781 len_file > len_search)
782 tmp += len_search;
783 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
784 }
785 xstrcat(&out_buffer, tmp, &out_len);
786 break;
787 case 'f':
788 found_file = 1;
789 if (be_wewy_wewy_quiet) break;
790 tmp = strrchr(filename, '/');
791 tmp = (tmp == NULL ? filename : tmp+1);
792 xstrcat(&out_buffer, tmp, &out_len);
793 break;
794 case 'o': out = get_elfetype(elf); break;
795 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
796 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
797 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
798 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
799 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
800 case 'n':
801 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
802 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
803 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
804 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
805 case 's': out = scanelf_file_sym(elf, &found_sym); break;
806 default: warnf("'%c' has no scan code?", out_format[i]);
807 }
808 if (out) xstrcat(&out_buffer, out, &out_len);
809 }
810
811 #define FOUND_SOMETHING() \
812 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
813 found_rpath || found_needed || found_interp || found_bind || \
814 found_soname || found_sym || found_lib || found_textrels)
815
816 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
817 xchrcat(&out_buffer, ' ', &out_len);
818 xstrcat(&out_buffer, filename, &out_len);
819 }
820 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
821 puts(out_buffer);
822 fflush(stdout);
823 }
824
825 unreadelf(elf);
826 }
827
828 /* scan a directory for ET_EXEC files and print when we find one */
829 static void scanelf_dir(const char *path)
830 {
831 register DIR *dir;
832 register struct dirent *dentry;
833 struct stat st_top, st;
834 char buf[_POSIX_PATH_MAX];
835 size_t pathlen = 0, len = 0;
836
837 /* make sure path exists */
838 if (lstat(path, &st_top) == -1) {
839 if (be_verbose > 2) printf("%s: does not exist\n", path);
840 return;
841 }
842
843 /* ok, if it isn't a directory, assume we can open it */
844 if (!S_ISDIR(st_top.st_mode)) {
845 scanelf_file(path);
846 return;
847 }
848
849 /* now scan the dir looking for fun stuff */
850 if ((dir = opendir(path)) == NULL) {
851 warnf("could not opendir %s: %s", path, strerror(errno));
852 return;
853 }
854 if (be_verbose) printf("%s: scanning dir\n", path);
855
856 pathlen = strlen(path);
857 while ((dentry = readdir(dir))) {
858 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
859 continue;
860 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
861 if (len >= sizeof(buf)) {
862 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
863 (unsigned long)len, (unsigned long)sizeof(buf));
864 continue;
865 }
866 sprintf(buf, "%s/%s", path, dentry->d_name);
867 if (lstat(buf, &st) != -1) {
868 if (S_ISREG(st.st_mode))
869 scanelf_file(buf);
870 else if (dir_recurse && S_ISDIR(st.st_mode)) {
871 if (dir_crossmount || (st_top.st_dev == st.st_dev))
872 scanelf_dir(buf);
873 }
874 }
875 }
876 closedir(dir);
877 }
878
879 static int scanelf_from_file(char *filename)
880 {
881 FILE *fp = NULL;
882 char *p;
883 char path[_POSIX_PATH_MAX];
884
885 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
886 fp = stdin;
887 else if ((fp = fopen(filename, "r")) == NULL)
888 return 1;
889
890 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
891 if ((p = strchr(path, '\n')) != NULL)
892 *p = 0;
893 search_path = path;
894 scanelf_dir(path);
895 }
896 if (fp != stdin)
897 fclose(fp);
898 return 0;
899 }
900
901 static void load_ld_so_conf()
902 {
903 FILE *fp = NULL;
904 char *p;
905 char path[_POSIX_PATH_MAX];
906 int i = 0;
907
908 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
909 return;
910
911 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
912 if (*path != '/')
913 continue;
914
915 if ((p = strrchr(path, '\r')) != NULL)
916 *p = 0;
917 if ((p = strchr(path, '\n')) != NULL)
918 *p = 0;
919
920 ldpaths[i++] = xstrdup(path);
921
922 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
923 break;
924 }
925 ldpaths[i] = NULL;
926
927 fclose(fp);
928 }
929
930 /* scan /etc/ld.so.conf for paths */
931 static void scanelf_ldpath()
932 {
933 char scan_l, scan_ul, scan_ull;
934 int i = 0;
935
936 if (!ldpaths[0])
937 err("Unable to load any paths from ld.so.conf");
938
939 scan_l = scan_ul = scan_ull = 0;
940
941 while (ldpaths[i]) {
942 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
943 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
944 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
945 scanelf_dir(ldpaths[i]);
946 ++i;
947 }
948
949 if (!scan_l) scanelf_dir("/lib");
950 if (!scan_ul) scanelf_dir("/usr/lib");
951 if (!scan_ull) scanelf_dir("/usr/local/lib");
952 }
953
954 /* scan env PATH for paths */
955 static void scanelf_envpath()
956 {
957 char *path, *p;
958
959 path = getenv("PATH");
960 if (!path)
961 err("PATH is not set in your env !");
962 path = xstrdup(path);
963
964 while ((p = strrchr(path, ':')) != NULL) {
965 scanelf_dir(p + 1);
966 *p = 0;
967 }
968
969 free(path);
970 }
971
972
973
974 /* usage / invocation handling functions */
975 #define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV"
976 #define a_argument required_argument
977 static struct option const long_opts[] = {
978 {"path", no_argument, NULL, 'p'},
979 {"ldpath", no_argument, NULL, 'l'},
980 {"recursive", no_argument, NULL, 'R'},
981 {"mount", no_argument, NULL, 'm'},
982 {"symlink", no_argument, NULL, 'y'},
983 {"pax", no_argument, NULL, 'x'},
984 {"header", no_argument, NULL, 'e'},
985 {"textrel", no_argument, NULL, 't'},
986 {"rpath", no_argument, NULL, 'r'},
987 {"needed", no_argument, NULL, 'n'},
988 {"interp", no_argument, NULL, 'i'},
989 {"bind", no_argument, NULL, 'b'},
990 {"soname", no_argument, NULL, 'S'},
991 {"symbol", a_argument, NULL, 's'},
992 {"lib", a_argument, NULL, 'N'},
993 {"gmatch", no_argument, NULL, 'g'},
994 {"textrels", no_argument, NULL, 'T'},
995 {"all", no_argument, NULL, 'a'},
996 {"quiet", no_argument, NULL, 'q'},
997 {"verbose", no_argument, NULL, 'v'},
998 {"format", a_argument, NULL, 'F'},
999 {"from", a_argument, NULL, 'f'},
1000 {"file", a_argument, NULL, 'o'},
1001 {"nobanner", no_argument, NULL, 'B'},
1002 {"help", no_argument, NULL, 'h'},
1003 {"version", no_argument, NULL, 'V'},
1004 {NULL, no_argument, NULL, 0x0}
1005 };
1006
1007 static const char *opts_help[] = {
1008 "Scan all directories in PATH environment",
1009 "Scan all directories in /etc/ld.so.conf",
1010 "Scan directories recursively",
1011 "Don't recursively cross mount points",
1012 "Don't scan symlinks\n",
1013 "Print PaX markings",
1014 "Print GNU_STACK/PT_LOAD markings",
1015 "Print TEXTREL information",
1016 "Print RPATH information",
1017 "Print NEEDED information",
1018 "Print INTERP information",
1019 "Print BIND information",
1020 "Print SONAME information",
1021 "Find a specified symbol",
1022 "Find a specified library",
1023 "Use strncmp to match libraries. (use with -N)",
1024 "Locate cause of TEXTREL",
1025 "Print all scanned info (-x -e -t -r -b)\n",
1026 "Only output 'bad' things",
1027 "Be verbose (can be specified more than once)",
1028 "Use specified format for output",
1029 "Read input stream from a filename",
1030 "Write output stream to a filename",
1031 "Don't display the header",
1032 "Print this help and exit",
1033 "Print version and exit",
1034 NULL
1035 };
1036
1037 /* display usage and exit */
1038 static void usage(int status)
1039 {
1040 unsigned long i;
1041 printf("* Scan ELF binaries for stuff\n\n"
1042 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1043 printf("Options: -[%s]\n", PARSE_FLAGS);
1044 for (i = 0; long_opts[i].name; ++i)
1045 if (long_opts[i].has_arg == no_argument)
1046 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1047 long_opts[i].name, opts_help[i]);
1048 else
1049 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1050 long_opts[i].name, opts_help[i]);
1051
1052 if (status != EXIT_SUCCESS)
1053 exit(status);
1054
1055 puts("\nThe format modifiers for the -F option are:");
1056 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1057 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1058 puts(" i INTERP \tb BIND \ts symbol");
1059 puts(" N library \to Type \tT TEXTRELs");
1060 puts(" S SONAME");
1061 puts(" p filename (with search path removed)");
1062 puts(" f filename (short name/basename)");
1063 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1064
1065 exit(status);
1066 }
1067
1068 /* parse command line arguments and preform needed actions */
1069 static void parseargs(int argc, char *argv[])
1070 {
1071 int i;
1072 char *from_file = NULL;
1073
1074 opterr = 0;
1075 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1076 switch (i) {
1077
1078 case 'V':
1079 printf("pax-utils-%s: %s compiled %s\n%s\n"
1080 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1081 VERSION, __FILE__, __DATE__, rcsid, argv0);
1082 exit(EXIT_SUCCESS);
1083 break;
1084 case 'h': usage(EXIT_SUCCESS); break;
1085 case 'f':
1086 if (from_file) err("Don't specify -f twice");
1087 from_file = xstrdup(optarg);
1088 break;
1089 case 'o': {
1090 FILE *fp = NULL;
1091 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1092 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1093 SET_STDOUT(fp);
1094 break;
1095 }
1096
1097 case 's': {
1098 size_t len;
1099 if (find_sym) err("Don't specify -s twice");
1100 find_sym = xstrdup(optarg);
1101 len = strlen(find_sym) + 1;
1102 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1103 sprintf(versioned_symname, "%s@", find_sym);
1104 break;
1105 }
1106 case 'N': {
1107 if (find_lib) err("Don't specify -N twice");
1108 find_lib = xstrdup(optarg);
1109 break;
1110 }
1111
1112 case 'F': {
1113 if (out_format) err("Don't specify -F twice");
1114 out_format = xstrdup(optarg);
1115 break;
1116 }
1117
1118 case 'g': gmatch = 1;
1119 case 'y': scan_symlink = 0; break;
1120 case 'B': show_banner = 0; break;
1121 case 'l': scan_ldpath = 1; break;
1122 case 'p': scan_envpath = 1; break;
1123 case 'R': dir_recurse = 1; break;
1124 case 'm': dir_crossmount = 0; break;
1125 case 'x': show_pax = 1; break;
1126 case 'e': show_phdr = 1; break;
1127 case 't': show_textrel = 1; break;
1128 case 'r': show_rpath = 1; break;
1129 case 'n': show_needed = 1; break;
1130 case 'i': show_interp = 1; break;
1131 case 'b': show_bind = 1; break;
1132 case 'S': show_soname = 1; break;
1133 case 'T': show_textrels = 1; break;
1134 case 'q': be_quiet = 1; break;
1135 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1136 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1137
1138 case ':':
1139 err("Option missing parameter\n");
1140 case '?':
1141 err("Unknown option\n");
1142 default:
1143 err("Unhandled option '%c'", i);
1144 }
1145 }
1146
1147 /* let the format option override all other options */
1148 if (out_format) {
1149 show_pax = show_phdr = show_textrel = show_rpath = \
1150 show_needed = show_interp = show_bind = show_soname = \
1151 show_textrels = 0;
1152 for (i = 0; out_format[i]; ++i) {
1153 if (!IS_MODIFIER(out_format[i])) continue;
1154
1155 switch (out_format[++i]) {
1156 case '%': break;
1157 case '#': break;
1158 case 'F': break;
1159 case 'p': break;
1160 case 'f': break;
1161 case 's': break;
1162 case 'N': break;
1163 case 'o': break;
1164 case 'x': show_pax = 1; break;
1165 case 'e': show_phdr = 1; break;
1166 case 't': show_textrel = 1; break;
1167 case 'r': show_rpath = 1; break;
1168 case 'n': show_needed = 1; break;
1169 case 'i': show_interp = 1; break;
1170 case 'b': show_bind = 1; break;
1171 case 'S': show_soname = 1; break;
1172 case 'T': show_textrels = 1; break;
1173 default:
1174 err("Invalid format specifier '%c' (byte %i)",
1175 out_format[i], i+1);
1176 }
1177 }
1178
1179 /* construct our default format */
1180 } else {
1181 size_t fmt_len = 30;
1182 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1183 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1184 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1185 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1186 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1187 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1188 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1189 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1190 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1191 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1192 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1193 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1194 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1195 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1196 }
1197 if (be_verbose > 2) printf("Format: %s\n", out_format);
1198
1199 /* now lets actually do the scanning */
1200 if (scan_ldpath || (show_rpath && be_quiet))
1201 load_ld_so_conf();
1202 if (scan_ldpath) scanelf_ldpath();
1203 if (scan_envpath) scanelf_envpath();
1204 if (from_file) {
1205 scanelf_from_file(from_file);
1206 free(from_file);
1207 from_file = *argv;
1208 }
1209 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1210 err("Nothing to scan !?");
1211 while (optind < argc) {
1212 search_path = argv[optind++];
1213 scanelf_dir(search_path);
1214 }
1215
1216 /* clean up */
1217 if (find_sym) {
1218 free(find_sym);
1219 free(versioned_symname);
1220 }
1221 if (find_lib) free(find_lib);
1222 if (out_format) free(out_format);
1223 for (i = 0; ldpaths[i]; ++i)
1224 free(ldpaths[i]);
1225 }
1226
1227
1228
1229 /* utility funcs */
1230 static char *xstrdup(const char *s)
1231 {
1232 char *ret = strdup(s);
1233 if (!ret) err("Could not strdup(): %s", strerror(errno));
1234 return ret;
1235 }
1236
1237 static void *xmalloc(size_t size)
1238 {
1239 void *ret = malloc(size);
1240 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1241 return ret;
1242 }
1243
1244 static void xstrcat(char **dst, const char *src, size_t *curr_len)
1245 {
1246 size_t new_len;
1247
1248 new_len = strlen(*dst) + strlen(src);
1249 if (*curr_len <= new_len) {
1250 *curr_len = new_len + (*curr_len / 2);
1251 *dst = realloc(*dst, *curr_len);
1252 if (!*dst)
1253 err("could not realloc %li bytes", (unsigned long)*curr_len);
1254 }
1255
1256 strcat(*dst, src);
1257 }
1258
1259 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1260 {
1261 static char my_app[2];
1262 my_app[0] = append;
1263 my_app[1] = '\0';
1264 xstrcat(dst, my_app, curr_len);
1265 }
1266
1267
1268
1269 int main(int argc, char *argv[])
1270 {
1271 if (argc < 2)
1272 usage(EXIT_FAILURE);
1273 parseargs(argc, argv);
1274 fclose(stdout);
1275 #ifdef __BOUNDS_CHECKING_ON
1276 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1277 #endif
1278 return EXIT_SUCCESS;
1279 }

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