/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.90 - (show annotations) (download) (as text)
Sun Dec 4 18:12:44 2005 UTC (8 years, 9 months ago) by vapier
Branch: MAIN
Changes since 1.89: +12 -11 lines
File MIME type: text/x-csrc
fix #e (it used to act like %e)

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 1.89 2005/10/13 01:53:55 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 1.89 2005/10/13 01:53:55 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 ret[7];
101 unsigned long i, shown;
102
103 if (!show_pax) return NULL;
104
105 shown = 0;
106 memset(&ret, 0, sizeof(ret));
107
108 if (elf->phdr) {
109 #define SHOW_PAX(B) \
110 if (elf->elf_class == ELFCLASS ## B) { \
111 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
112 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
113 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
114 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
115 continue; \
116 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
117 continue; \
118 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found_pax = 1; \
120 ++shown; \
121 break; \
122 } \
123 }
124 SHOW_PAX(32)
125 SHOW_PAX(64)
126 }
127
128 /* fall back to EI_PAX if no PT_PAX was found */
129 if (!*ret) {
130 static char *paxflags;
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 (be_wewy_wewy_quiet ? NULL : paxflags);
135 }
136 strncpy(ret, paxflags, sizeof(ret));
137 }
138
139 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL;
141 else
142 return ret;
143 }
144
145 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
146 {
147 static char ret[12];
148 char *found;
149 unsigned long i, off, shown, check_flags;
150 unsigned char multi_stack, multi_relro, multi_load;
151
152 if (!show_phdr) return NULL;
153
154 memcpy(ret, "--- --- ---\0", 12);
155
156 shown = 0;
157 multi_stack = multi_relro = multi_load = 0;
158
159 if (elf->phdr) {
160 #define SHOW_PHDR(B) \
161 if (elf->elf_class == ELFCLASS ## B) { \
162 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
163 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
164 uint32_t flags; \
165 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
166 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
167 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
168 found = found_phdr; \
169 off = 0; \
170 check_flags = PF_X; \
171 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
172 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
173 found = found_relro; \
174 off = 4; \
175 check_flags = PF_X; \
176 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
177 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
178 found = found_load; \
179 off = 8; \
180 check_flags = PF_W|PF_X; \
181 } else \
182 continue; \
183 flags = EGET(phdr[i].p_flags); \
184 if (be_quiet && ((flags & check_flags) != check_flags)) \
185 continue; \
186 memcpy(ret+off, gnu_short_stack_flags(flags), 3); \
187 *found = 1; \
188 ++shown; \
189 } \
190 }
191 SHOW_PHDR(32)
192 SHOW_PHDR(64)
193 }
194
195 if (be_wewy_wewy_quiet || (be_quiet && !shown))
196 return NULL;
197 else
198 return ret;
199 }
200 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
201 {
202 static const char *ret = "TEXTREL";
203 unsigned long i;
204
205 if (!show_textrel && !show_textrels) return NULL;
206
207 if (elf->phdr) {
208 #define SHOW_TEXTREL(B) \
209 if (elf->elf_class == ELFCLASS ## B) { \
210 Elf ## B ## _Dyn *dyn; \
211 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
212 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
213 Elf ## B ## _Off offset; \
214 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
215 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
216 offset = EGET(phdr[i].p_offset); \
217 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
218 dyn = DYN ## B (elf->data + offset); \
219 while (EGET(dyn->d_tag) != DT_NULL) { \
220 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
221 *found_textrel = 1; \
222 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
223 return (be_wewy_wewy_quiet ? NULL : ret); \
224 } \
225 ++dyn; \
226 } \
227 } }
228 SHOW_TEXTREL(32)
229 SHOW_TEXTREL(64)
230 }
231
232 if (be_quiet || be_wewy_wewy_quiet)
233 return NULL;
234 else
235 return " - ";
236 }
237 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
238 {
239 unsigned long s, r, rmax;
240 void *symtab_void, *strtab_void, *text_void;
241
242 if (!show_textrels) return NULL;
243
244 /* don't search for TEXTREL's if the ELF doesn't have any */
245 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
246 if (!*found_textrel) return NULL;
247
248 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
249 text_void = elf_findsecbyname(elf, ".text");
250
251 if (symtab_void && strtab_void && text_void && elf->shdr) {
252 #define SHOW_TEXTRELS(B) \
253 if (elf->elf_class == ELFCLASS ## B) { \
254 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
255 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
256 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
257 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
258 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
259 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
260 uint ## B ## _t memsz = EGET(text->sh_size); \
261 Elf ## B ## _Rel *rel; \
262 Elf ## B ## _Rela *rela; \
263 /* search the section headers for relocations */ \
264 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
265 uint32_t sh_type = EGET(shdr[s].sh_type); \
266 if (sh_type == SHT_REL) { \
267 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
268 rela = NULL; \
269 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
270 } else if (sh_type == SHT_RELA) { \
271 rel = NULL; \
272 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
273 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
274 } else \
275 continue; \
276 /* now see if any of the relocs are in the .text */ \
277 for (r = 0; r < rmax; ++r) { \
278 unsigned long sym_max; \
279 Elf ## B ## _Addr offset_tmp; \
280 Elf ## B ## _Sym *func; \
281 Elf ## B ## _Sym *sym; \
282 Elf ## B ## _Addr r_offset; \
283 uint ## B ## _t r_info; \
284 if (sh_type == SHT_REL) { \
285 r_offset = EGET(rel[r].r_offset); \
286 r_info = EGET(rel[r].r_info); \
287 } else { \
288 r_offset = EGET(rela[r].r_offset); \
289 r_info = EGET(rela[r].r_info); \
290 } \
291 /* make sure this relocation is inside of the .text */ \
292 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
293 if (be_verbose <= 2) continue; \
294 } else \
295 *found_textrels = 1; \
296 /* locate this relocation symbol name */ \
297 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
298 sym_max = ELF ## B ## _R_SYM(r_info); \
299 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
300 sym += sym_max; \
301 else \
302 sym = NULL; \
303 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
304 /* show the raw details about this reloc */ \
305 printf(" %s: ", elf->base_filename); \
306 if (sym && sym->st_name) \
307 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
308 else \
309 printf("(memory/fake?)"); \
310 printf(" [0x%lX]", (unsigned long)r_offset); \
311 /* now try to find the closest symbol that this rel is probably in */ \
312 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
313 func = NULL; \
314 offset_tmp = 0; \
315 while (sym_max--) { \
316 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
317 func = sym; \
318 offset_tmp = EGET(sym->st_value); \
319 } \
320 ++sym; \
321 } \
322 printf(" in "); \
323 if (func && func->st_name) \
324 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
325 else \
326 printf("(NULL: fake?)"); \
327 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
328 } \
329 } }
330 SHOW_TEXTRELS(32)
331 SHOW_TEXTRELS(64)
332 }
333 if (!*found_textrels)
334 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
335
336 return NULL;
337 }
338
339 static void rpath_security_checks(elfobj *, char *);
340 static void rpath_security_checks(elfobj *elf, char *item) {
341 struct stat st;
342 switch (*item) {
343 case '/': break;
344 case '.':
345 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
346 break;
347 case '\0':
348 warnf("Security problem NULL RPATH in %s", elf->filename);
349 break;
350 case '$':
351 if (fstat(elf->fd, &st) != -1)
352 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
353 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
354 item, elf->filename, st.st_mode & 07777);
355 break;
356 default:
357 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
358 break;
359 }
360 }
361 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
362 {
363 unsigned long i, s;
364 char *rpath, *runpath, **r;
365 void *strtbl_void;
366
367 if (!show_rpath) return;
368
369 strtbl_void = elf_findsecbyname(elf, ".dynstr");
370 rpath = runpath = NULL;
371
372 if (elf->phdr && strtbl_void) {
373 #define SHOW_RPATH(B) \
374 if (elf->elf_class == ELFCLASS ## B) { \
375 Elf ## B ## _Dyn *dyn; \
376 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
377 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
378 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
379 Elf ## B ## _Off offset; \
380 Elf ## B ## _Xword word; \
381 /* Scan all the program headers */ \
382 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
383 /* Just scan dynamic headers */ \
384 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
385 offset = EGET(phdr[i].p_offset); \
386 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
387 /* Just scan dynamic RPATH/RUNPATH headers */ \
388 dyn = DYN ## B (elf->data + offset); \
389 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
390 if (word == DT_RPATH) { \
391 r = &rpath; \
392 } else if (word == DT_RUNPATH) { \
393 r = &runpath; \
394 } else { \
395 ++dyn; \
396 continue; \
397 } \
398 /* Verify the memory is somewhat sane */ \
399 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
400 if (offset < (Elf ## B ## _Off)elf->len) { \
401 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
402 *r = (char*)(elf->data + offset); \
403 /* If quiet, don't output paths in ld.so.conf */ \
404 if (be_quiet) { \
405 size_t len; \
406 char *start, *end; \
407 /* note that we only 'chop' off leading known paths. */ \
408 /* since *r is read-only memory, we can only move the ptr forward. */ \
409 start = *r; \
410 /* scan each path in : delimited list */ \
411 while (start) { \
412 rpath_security_checks(elf, start); \
413 end = strchr(start, ':'); \
414 len = (end ? abs(end - start) : strlen(start)); \
415 for (s = 0; ldpaths[s]; ++s) { \
416 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
417 *r = (end ? end + 1 : NULL); \
418 break; \
419 } \
420 } \
421 if (!*r || !ldpaths[s] || !end) \
422 start = NULL; \
423 else \
424 start = start + len + 1; \
425 } \
426 } \
427 if (*r) *found_rpath = 1; \
428 } \
429 ++dyn; \
430 } \
431 } }
432 SHOW_RPATH(32)
433 SHOW_RPATH(64)
434 }
435
436 if (be_wewy_wewy_quiet) return;
437
438 if (rpath && runpath) {
439 if (!strcmp(rpath, runpath)) {
440 xstrcat(ret, runpath, ret_len);
441 } else {
442 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
443 xchrcat(ret, '{', ret_len);
444 xstrcat(ret, rpath, ret_len);
445 xchrcat(ret, ',', ret_len);
446 xstrcat(ret, runpath, ret_len);
447 xchrcat(ret, '}', ret_len);
448 }
449 } else if (rpath || runpath)
450 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
451 else if (!be_quiet)
452 xstrcat(ret, " - ", ret_len);
453 }
454 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
455 {
456 unsigned long i;
457 char *needed;
458 void *strtbl_void;
459
460 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
461
462 strtbl_void = elf_findsecbyname(elf, ".dynstr");
463
464 if (elf->phdr && strtbl_void) {
465 #define SHOW_NEEDED(B) \
466 if (elf->elf_class == ELFCLASS ## B) { \
467 Elf ## B ## _Dyn *dyn; \
468 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
469 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
470 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
471 Elf ## B ## _Off offset; \
472 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
473 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
474 offset = EGET(phdr[i].p_offset); \
475 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
476 dyn = DYN ## B (elf->data + offset); \
477 while (EGET(dyn->d_tag) != DT_NULL) { \
478 if (EGET(dyn->d_tag) == DT_NEEDED) { \
479 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
480 if (offset >= (Elf ## B ## _Off)elf->len) { \
481 ++dyn; \
482 continue; \
483 } \
484 needed = (char*)(elf->data + offset); \
485 if (op == 0) { \
486 if (!be_wewy_wewy_quiet) { \
487 if (*found_needed) xchrcat(ret, ',', ret_len); \
488 xstrcat(ret, needed, ret_len); \
489 } \
490 *found_needed = 1; \
491 } else { \
492 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
493 *found_lib = 1; \
494 return (be_wewy_wewy_quiet ? NULL : needed); \
495 } \
496 } \
497 } \
498 ++dyn; \
499 } \
500 } }
501 SHOW_NEEDED(32)
502 SHOW_NEEDED(64)
503 if (op == 0 && !*found_needed && be_verbose)
504 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
505 }
506
507 return NULL;
508 }
509 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
510 {
511 void *strtbl_void;
512
513 if (!show_interp) return NULL;
514
515 strtbl_void = elf_findsecbyname(elf, ".interp");
516
517 if (strtbl_void) {
518 #define SHOW_INTERP(B) \
519 if (elf->elf_class == ELFCLASS ## B) { \
520 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
521 *found_interp = 1; \
522 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
523 }
524 SHOW_INTERP(32)
525 SHOW_INTERP(64)
526 }
527 return NULL;
528 }
529 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
530 {
531 unsigned long i;
532 struct stat s;
533
534 if (!show_bind) return NULL;
535 if (!elf->phdr) return NULL;
536
537 #define SHOW_BIND(B) \
538 if (elf->elf_class == ELFCLASS ## B) { \
539 Elf ## B ## _Dyn *dyn; \
540 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
541 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
542 Elf ## B ## _Off offset; \
543 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
544 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
545 offset = EGET(phdr[i].p_offset); \
546 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
547 dyn = DYN ## B (elf->data + offset); \
548 while (EGET(dyn->d_tag) != DT_NULL) { \
549 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
550 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
551 { \
552 if (be_quiet) return NULL; \
553 *found_bind = 1; \
554 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
555 } \
556 ++dyn; \
557 } \
558 } \
559 }
560 SHOW_BIND(32)
561 SHOW_BIND(64)
562
563 if (be_wewy_wewy_quiet) return NULL;
564
565 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
566 return NULL;
567 } else {
568 *found_bind = 1;
569 return (char *) "LAZY";
570 }
571 }
572 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
573 {
574 unsigned long i;
575 char *soname;
576 void *strtbl_void;
577
578 if (!show_soname) return NULL;
579
580 strtbl_void = elf_findsecbyname(elf, ".dynstr");
581
582 if (elf->phdr && strtbl_void) {
583 #define SHOW_SONAME(B) \
584 if (elf->elf_class == ELFCLASS ## B) { \
585 Elf ## B ## _Dyn *dyn; \
586 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
587 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
588 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
589 Elf ## B ## _Off offset; \
590 /* only look for soname in shared objects */ \
591 if (ehdr->e_type != ET_DYN) \
592 return NULL; \
593 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
594 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
595 offset = EGET(phdr[i].p_offset); \
596 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
597 dyn = DYN ## B (elf->data + offset); \
598 while (EGET(dyn->d_tag) != DT_NULL) { \
599 if (EGET(dyn->d_tag) == DT_SONAME) { \
600 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
601 if (offset >= (Elf ## B ## _Off)elf->len) { \
602 ++dyn; \
603 continue; \
604 } \
605 soname = (char*)(elf->data + offset); \
606 *found_soname = 1; \
607 return (be_wewy_wewy_quiet ? NULL : soname); \
608 } \
609 ++dyn; \
610 } \
611 } }
612 SHOW_SONAME(32)
613 SHOW_SONAME(64)
614 }
615
616 return NULL;
617 }
618 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
619 {
620 unsigned long i;
621 void *symtab_void, *strtab_void;
622
623 if (!find_sym) return NULL;
624
625 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
626
627 if (symtab_void && strtab_void) {
628 #define FIND_SYM(B) \
629 if (elf->elf_class == ELFCLASS ## B) { \
630 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
631 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
632 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
633 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
634 char *symname; \
635 for (i = 0; i < cnt; ++i) { \
636 if (sym->st_name) { \
637 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
638 if (*find_sym == '*') { \
639 printf("%s(%s) %5lX %15s %s\n", \
640 ((*found_sym == 0) ? "\n\t" : "\t"), \
641 elf->base_filename, \
642 (long)sym->st_size, \
643 (char *)get_elfstttype(sym->st_info), \
644 symname); \
645 *found_sym = 1; \
646 } else if ((strcmp(find_sym, symname) == 0) || \
647 (strcmp(symname, versioned_symname) == 0)) \
648 (*found_sym)++; \
649 } \
650 ++sym; \
651 } }
652 FIND_SYM(32)
653 FIND_SYM(64)
654 }
655
656 if (be_wewy_wewy_quiet) return NULL;
657
658 if (*find_sym != '*' && *found_sym)
659 return find_sym;
660 if (be_quiet)
661 return NULL;
662 else
663 return (char *)" - ";
664 }
665 /* scan an elf file and show all the fun stuff */
666 #define prints(str) write(fileno(stdout), str, strlen(str))
667 static void scanelf_file(const char *filename)
668 {
669 unsigned long i;
670 char found_pax, found_phdr, found_relro, found_load, found_textrel,
671 found_rpath, found_needed, found_interp, found_bind, found_soname,
672 found_sym, found_lib, found_file, found_textrels;
673 elfobj *elf;
674 struct stat st;
675 static char *out_buffer = NULL;
676 static size_t out_len;
677
678 /* make sure 'filename' exists */
679 if (lstat(filename, &st) == -1) {
680 if (be_verbose > 2) printf("%s: does not exist\n", filename);
681 return;
682 }
683 /* always handle regular files and handle symlinked files if no -y */
684 if (S_ISLNK(st.st_mode)) {
685 if (!scan_symlink) return;
686 stat(filename, &st);
687 }
688 if (!S_ISREG(st.st_mode)) {
689 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
690 return;
691 }
692
693 found_pax = found_phdr = found_relro = found_load = found_textrel = \
694 found_rpath = found_needed = found_interp = found_bind = found_soname = \
695 found_sym = found_lib = found_file = found_textrels = 0;
696
697 /* verify this is real ELF */
698 if ((elf = readelf(filename)) == NULL) {
699 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
700 return;
701 }
702
703 if (be_verbose > 1)
704 printf("%s: scanning file {%s,%s}\n", filename,
705 get_elfeitype(EI_CLASS, elf->elf_class),
706 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
707 else if (be_verbose)
708 printf("%s: scanning file\n", filename);
709
710 /* init output buffer */
711 if (!out_buffer) {
712 out_len = sizeof(char) * 80;
713 out_buffer = (char*)xmalloc(out_len);
714 }
715 *out_buffer = '\0';
716
717 /* show the header */
718 if (!be_quiet && show_banner) {
719 for (i = 0; out_format[i]; ++i) {
720 if (!IS_MODIFIER(out_format[i])) continue;
721
722 switch (out_format[++i]) {
723 case '%': break;
724 case '#': break;
725 case 'F':
726 case 'p':
727 case 'f': prints("FILE "); found_file = 1; break;
728 case 'o': prints(" TYPE "); break;
729 case 'x': prints(" PAX "); break;
730 case 'e': prints("STK/REL/PTL "); break;
731 case 't': prints("TEXTREL "); break;
732 case 'r': prints("RPATH "); break;
733 case 'n': prints("NEEDED "); break;
734 case 'i': prints("INTERP "); break;
735 case 'b': prints("BIND "); break;
736 case 'S': prints("SONAME "); break;
737 case 's': prints("SYM "); break;
738 case 'N': prints("LIB "); break;
739 case 'T': prints("TEXTRELS "); break;
740 default: warnf("'%c' has no title ?", out_format[i]);
741 }
742 }
743 if (!found_file) prints("FILE ");
744 prints("\n");
745 found_file = 0;
746 show_banner = 0;
747 }
748
749 /* dump all the good stuff */
750 for (i = 0; out_format[i]; ++i) {
751 const char *out;
752 const char *tmp;
753
754 /* make sure we trim leading spaces in quiet mode */
755 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
756 *out_buffer = '\0';
757
758 if (!IS_MODIFIER(out_format[i])) {
759 xchrcat(&out_buffer, out_format[i], &out_len);
760 continue;
761 }
762
763 out = NULL;
764 be_wewy_wewy_quiet = (out_format[i] == '#');
765 switch (out_format[++i]) {
766 case '%':
767 case '#':
768 xchrcat(&out_buffer, out_format[i], &out_len); break;
769 case 'F':
770 found_file = 1;
771 if (be_wewy_wewy_quiet) break;
772 xstrcat(&out_buffer, filename, &out_len);
773 break;
774 case 'p':
775 found_file = 1;
776 if (be_wewy_wewy_quiet) break;
777 tmp = filename;
778 if (search_path) {
779 ssize_t len_search = strlen(search_path);
780 ssize_t len_file = strlen(filename);
781 if (!strncmp(filename, search_path, len_search) && \
782 len_file > len_search)
783 tmp += len_search;
784 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
785 }
786 xstrcat(&out_buffer, tmp, &out_len);
787 break;
788 case 'f':
789 found_file = 1;
790 if (be_wewy_wewy_quiet) break;
791 tmp = strrchr(filename, '/');
792 tmp = (tmp == NULL ? filename : tmp+1);
793 xstrcat(&out_buffer, tmp, &out_len);
794 break;
795 case 'o': out = get_elfetype(elf); break;
796 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
797 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
798 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
799 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
800 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
801 case 'n':
802 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
803 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
804 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
805 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
806 case 's': out = scanelf_file_sym(elf, &found_sym); break;
807 default: warnf("'%c' has no scan code?", out_format[i]);
808 }
809 if (out) xstrcat(&out_buffer, out, &out_len);
810 }
811
812 #define FOUND_SOMETHING() \
813 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
814 found_rpath || found_needed || found_interp || found_bind || \
815 found_soname || found_sym || found_lib || found_textrels)
816
817 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
818 xchrcat(&out_buffer, ' ', &out_len);
819 xstrcat(&out_buffer, filename, &out_len);
820 }
821 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
822 puts(out_buffer);
823 fflush(stdout);
824 }
825
826 unreadelf(elf);
827 }
828
829 /* scan a directory for ET_EXEC files and print when we find one */
830 static void scanelf_dir(const char *path)
831 {
832 register DIR *dir;
833 register struct dirent *dentry;
834 struct stat st_top, st;
835 char buf[_POSIX_PATH_MAX];
836 size_t pathlen = 0, len = 0;
837
838 /* make sure path exists */
839 if (lstat(path, &st_top) == -1) {
840 if (be_verbose > 2) printf("%s: does not exist\n", path);
841 return;
842 }
843
844 /* ok, if it isn't a directory, assume we can open it */
845 if (!S_ISDIR(st_top.st_mode)) {
846 scanelf_file(path);
847 return;
848 }
849
850 /* now scan the dir looking for fun stuff */
851 if ((dir = opendir(path)) == NULL) {
852 warnf("could not opendir %s: %s", path, strerror(errno));
853 return;
854 }
855 if (be_verbose) printf("%s: scanning dir\n", path);
856
857 pathlen = strlen(path);
858 while ((dentry = readdir(dir))) {
859 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
860 continue;
861 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
862 if (len >= sizeof(buf)) {
863 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
864 (unsigned long)len, (unsigned long)sizeof(buf));
865 continue;
866 }
867 sprintf(buf, "%s/%s", path, dentry->d_name);
868 if (lstat(buf, &st) != -1) {
869 if (S_ISREG(st.st_mode))
870 scanelf_file(buf);
871 else if (dir_recurse && S_ISDIR(st.st_mode)) {
872 if (dir_crossmount || (st_top.st_dev == st.st_dev))
873 scanelf_dir(buf);
874 }
875 }
876 }
877 closedir(dir);
878 }
879
880 static int scanelf_from_file(char *filename)
881 {
882 FILE *fp = NULL;
883 char *p;
884 char path[_POSIX_PATH_MAX];
885
886 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
887 fp = stdin;
888 else if ((fp = fopen(filename, "r")) == NULL)
889 return 1;
890
891 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
892 if ((p = strchr(path, '\n')) != NULL)
893 *p = 0;
894 search_path = path;
895 scanelf_dir(path);
896 }
897 if (fp != stdin)
898 fclose(fp);
899 return 0;
900 }
901
902 static void load_ld_so_conf()
903 {
904 FILE *fp = NULL;
905 char *p;
906 char path[_POSIX_PATH_MAX];
907 int i = 0;
908
909 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
910 return;
911
912 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
913 if (*path != '/')
914 continue;
915
916 if ((p = strrchr(path, '\r')) != NULL)
917 *p = 0;
918 if ((p = strchr(path, '\n')) != NULL)
919 *p = 0;
920
921 ldpaths[i++] = xstrdup(path);
922
923 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
924 break;
925 }
926 ldpaths[i] = NULL;
927
928 fclose(fp);
929 }
930
931 /* scan /etc/ld.so.conf for paths */
932 static void scanelf_ldpath()
933 {
934 char scan_l, scan_ul, scan_ull;
935 int i = 0;
936
937 if (!ldpaths[0])
938 err("Unable to load any paths from ld.so.conf");
939
940 scan_l = scan_ul = scan_ull = 0;
941
942 while (ldpaths[i]) {
943 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
944 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
945 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
946 scanelf_dir(ldpaths[i]);
947 ++i;
948 }
949
950 if (!scan_l) scanelf_dir("/lib");
951 if (!scan_ul) scanelf_dir("/usr/lib");
952 if (!scan_ull) scanelf_dir("/usr/local/lib");
953 }
954
955 /* scan env PATH for paths */
956 static void scanelf_envpath()
957 {
958 char *path, *p;
959
960 path = getenv("PATH");
961 if (!path)
962 err("PATH is not set in your env !");
963 path = xstrdup(path);
964
965 while ((p = strrchr(path, ':')) != NULL) {
966 scanelf_dir(p + 1);
967 *p = 0;
968 }
969
970 free(path);
971 }
972
973
974
975 /* usage / invocation handling functions */
976 #define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV"
977 #define a_argument required_argument
978 static struct option const long_opts[] = {
979 {"path", no_argument, NULL, 'p'},
980 {"ldpath", no_argument, NULL, 'l'},
981 {"recursive", no_argument, NULL, 'R'},
982 {"mount", no_argument, NULL, 'm'},
983 {"symlink", no_argument, NULL, 'y'},
984 {"pax", no_argument, NULL, 'x'},
985 {"header", no_argument, NULL, 'e'},
986 {"textrel", no_argument, NULL, 't'},
987 {"rpath", no_argument, NULL, 'r'},
988 {"needed", no_argument, NULL, 'n'},
989 {"interp", no_argument, NULL, 'i'},
990 {"bind", no_argument, NULL, 'b'},
991 {"soname", no_argument, NULL, 'S'},
992 {"symbol", a_argument, NULL, 's'},
993 {"lib", a_argument, NULL, 'N'},
994 {"gmatch", no_argument, NULL, 'g'},
995 {"textrels", no_argument, NULL, 'T'},
996 {"all", no_argument, NULL, 'a'},
997 {"quiet", no_argument, NULL, 'q'},
998 {"verbose", no_argument, NULL, 'v'},
999 {"format", a_argument, NULL, 'F'},
1000 {"from", a_argument, NULL, 'f'},
1001 {"file", a_argument, NULL, 'o'},
1002 {"nobanner", no_argument, NULL, 'B'},
1003 {"help", no_argument, NULL, 'h'},
1004 {"version", no_argument, NULL, 'V'},
1005 {NULL, no_argument, NULL, 0x0}
1006 };
1007
1008 static const char *opts_help[] = {
1009 "Scan all directories in PATH environment",
1010 "Scan all directories in /etc/ld.so.conf",
1011 "Scan directories recursively",
1012 "Don't recursively cross mount points",
1013 "Don't scan symlinks\n",
1014 "Print PaX markings",
1015 "Print GNU_STACK/PT_LOAD markings",
1016 "Print TEXTREL information",
1017 "Print RPATH information",
1018 "Print NEEDED information",
1019 "Print INTERP information",
1020 "Print BIND information",
1021 "Print SONAME information",
1022 "Find a specified symbol",
1023 "Find a specified library",
1024 "Use strncmp to match libraries. (use with -N)",
1025 "Locate cause of TEXTREL",
1026 "Print all scanned info (-x -e -t -r -b)\n",
1027 "Only output 'bad' things",
1028 "Be verbose (can be specified more than once)",
1029 "Use specified format for output",
1030 "Read input stream from a filename",
1031 "Write output stream to a filename",
1032 "Don't display the header",
1033 "Print this help and exit",
1034 "Print version and exit",
1035 NULL
1036 };
1037
1038 /* display usage and exit */
1039 static void usage(int status)
1040 {
1041 unsigned long i;
1042 printf("* Scan ELF binaries for stuff\n\n"
1043 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1044 printf("Options: -[%s]\n", PARSE_FLAGS);
1045 for (i = 0; long_opts[i].name; ++i)
1046 if (long_opts[i].has_arg == no_argument)
1047 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1048 long_opts[i].name, opts_help[i]);
1049 else
1050 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1051 long_opts[i].name, opts_help[i]);
1052
1053 if (status != EXIT_SUCCESS)
1054 exit(status);
1055
1056 puts("\nThe format modifiers for the -F option are:");
1057 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1058 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1059 puts(" i INTERP \tb BIND \ts symbol");
1060 puts(" N library \to Type \tT TEXTRELs");
1061 puts(" S SONAME");
1062 puts(" p filename (with search path removed)");
1063 puts(" f filename (short name/basename)");
1064 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1065
1066 exit(status);
1067 }
1068
1069 /* parse command line arguments and preform needed actions */
1070 static void parseargs(int argc, char *argv[])
1071 {
1072 int i;
1073 char *from_file = NULL;
1074
1075 opterr = 0;
1076 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1077 switch (i) {
1078
1079 case 'V':
1080 printf("pax-utils-%s: %s compiled %s\n%s\n"
1081 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1082 VERSION, __FILE__, __DATE__, rcsid, argv0);
1083 exit(EXIT_SUCCESS);
1084 break;
1085 case 'h': usage(EXIT_SUCCESS); break;
1086 case 'f':
1087 if (from_file) err("Don't specify -f twice");
1088 from_file = xstrdup(optarg);
1089 break;
1090 case 'o': {
1091 FILE *fp = NULL;
1092 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1093 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1094 SET_STDOUT(fp);
1095 break;
1096 }
1097
1098 case 's': {
1099 size_t len;
1100 if (find_sym) err("Don't specify -s twice");
1101 find_sym = xstrdup(optarg);
1102 len = strlen(find_sym) + 1;
1103 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
1104 sprintf(versioned_symname, "%s@", find_sym);
1105 break;
1106 }
1107 case 'N': {
1108 if (find_lib) err("Don't specify -N twice");
1109 find_lib = xstrdup(optarg);
1110 break;
1111 }
1112
1113 case 'F': {
1114 if (out_format) err("Don't specify -F twice");
1115 out_format = xstrdup(optarg);
1116 break;
1117 }
1118
1119 case 'g': gmatch = 1;
1120 case 'y': scan_symlink = 0; break;
1121 case 'B': show_banner = 0; break;
1122 case 'l': scan_ldpath = 1; break;
1123 case 'p': scan_envpath = 1; break;
1124 case 'R': dir_recurse = 1; break;
1125 case 'm': dir_crossmount = 0; break;
1126 case 'x': show_pax = 1; break;
1127 case 'e': show_phdr = 1; break;
1128 case 't': show_textrel = 1; break;
1129 case 'r': show_rpath = 1; break;
1130 case 'n': show_needed = 1; break;
1131 case 'i': show_interp = 1; break;
1132 case 'b': show_bind = 1; break;
1133 case 'S': show_soname = 1; break;
1134 case 'T': show_textrels = 1; break;
1135 case 'q': be_quiet = 1; break;
1136 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1137 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1138
1139 case ':':
1140 err("Option missing parameter\n");
1141 case '?':
1142 err("Unknown option\n");
1143 default:
1144 err("Unhandled option '%c'", i);
1145 }
1146 }
1147
1148 /* let the format option override all other options */
1149 if (out_format) {
1150 show_pax = show_phdr = show_textrel = show_rpath = \
1151 show_needed = show_interp = show_bind = show_soname = \
1152 show_textrels = 0;
1153 for (i = 0; out_format[i]; ++i) {
1154 if (!IS_MODIFIER(out_format[i])) continue;
1155
1156 switch (out_format[++i]) {
1157 case '%': break;
1158 case '#': break;
1159 case 'F': break;
1160 case 'p': break;
1161 case 'f': break;
1162 case 's': break;
1163 case 'N': break;
1164 case 'o': break;
1165 case 'x': show_pax = 1; break;
1166 case 'e': show_phdr = 1; break;
1167 case 't': show_textrel = 1; break;
1168 case 'r': show_rpath = 1; break;
1169 case 'n': show_needed = 1; break;
1170 case 'i': show_interp = 1; break;
1171 case 'b': show_bind = 1; break;
1172 case 'S': show_soname = 1; break;
1173 case 'T': show_textrels = 1; break;
1174 default:
1175 err("Invalid format specifier '%c' (byte %i)",
1176 out_format[i], i+1);
1177 }
1178 }
1179
1180 /* construct our default format */
1181 } else {
1182 size_t fmt_len = 30;
1183 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1184 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1185 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1186 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1187 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1188 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1189 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1190 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1191 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1192 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1193 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1194 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1195 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1196 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1197 }
1198 if (be_verbose > 2) printf("Format: %s\n", out_format);
1199
1200 /* now lets actually do the scanning */
1201 if (scan_ldpath || (show_rpath && be_quiet))
1202 load_ld_so_conf();
1203 if (scan_ldpath) scanelf_ldpath();
1204 if (scan_envpath) scanelf_envpath();
1205 if (from_file) {
1206 scanelf_from_file(from_file);
1207 free(from_file);
1208 from_file = *argv;
1209 }
1210 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1211 err("Nothing to scan !?");
1212 while (optind < argc) {
1213 search_path = argv[optind++];
1214 scanelf_dir(search_path);
1215 }
1216
1217 /* clean up */
1218 if (find_sym) {
1219 free(find_sym);
1220 free(versioned_symname);
1221 }
1222 if (find_lib) free(find_lib);
1223 if (out_format) free(out_format);
1224 for (i = 0; ldpaths[i]; ++i)
1225 free(ldpaths[i]);
1226 }
1227
1228
1229
1230 /* utility funcs */
1231 static char *xstrdup(const char *s)
1232 {
1233 char *ret = strdup(s);
1234 if (!ret) err("Could not strdup(): %s", strerror(errno));
1235 return ret;
1236 }
1237
1238 static void *xmalloc(size_t size)
1239 {
1240 void *ret = malloc(size);
1241 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1242 return ret;
1243 }
1244
1245 static void xstrcat(char **dst, const char *src, size_t *curr_len)
1246 {
1247 size_t new_len;
1248
1249 new_len = strlen(*dst) + strlen(src);
1250 if (*curr_len <= new_len) {
1251 *curr_len = new_len + (*curr_len / 2);
1252 *dst = realloc(*dst, *curr_len);
1253 if (!*dst)
1254 err("could not realloc %li bytes", (unsigned long)*curr_len);
1255 }
1256
1257 strcat(*dst, src);
1258 }
1259
1260 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1261 {
1262 static char my_app[2];
1263 my_app[0] = append;
1264 my_app[1] = '\0';
1265 xstrcat(dst, my_app, curr_len);
1266 }
1267
1268
1269
1270 int main(int argc, char *argv[])
1271 {
1272 if (argc < 2)
1273 usage(EXIT_FAILURE);
1274 parseargs(argc, argv);
1275 fclose(stdout);
1276 #ifdef __BOUNDS_CHECKING_ON
1277 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1278 #endif
1279 return EXIT_SUCCESS;
1280 }

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