/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.94 - (show annotations) (download) (as text)
Sat Dec 10 04:10:26 2005 UTC (8 years, 9 months ago) by vapier
Branch: MAIN
Changes since 1.93: +3 -3 lines
File MIME type: text/x-csrc
st_size is unsigned, so dont cast it to signed

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 1.93 2005/12/10 04:07:55 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 #include <string.h>
16 #include <errno.h>
17 #include <unistd.h>
18 #include <sys/stat.h>
19 #include <dirent.h>
20 #include <getopt.h>
21 #include <assert.h>
22 #include "paxinc.h"
23
24 static const char *rcsid = "$Id: scanelf.c,v 1.93 2005/12/10 04:07:55 vapier Exp $";
25 #define argv0 "scanelf"
26
27 #define IS_MODIFIER(c) (c == '%' || c == '#')
28
29
30
31 /* prototypes */
32 static void scanelf_file(const char *filename);
33 static void scanelf_dir(const char *path);
34 static void scanelf_ldpath();
35 static void scanelf_envpath();
36 static void usage(int status);
37 static void parseargs(int argc, char *argv[]);
38 static char *xstrdup(const char *s);
39 static void *xmalloc(size_t size);
40 static void xstrcat(char **dst, const char *src, size_t *curr_len);
41 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
42
43 /* variables to control behavior */
44 static char *ldpaths[256];
45 static char scan_ldpath = 0;
46 static char scan_envpath = 0;
47 static char scan_symlink = 1;
48 static char dir_recurse = 0;
49 static char dir_crossmount = 1;
50 static char show_pax = 0;
51 static char show_phdr = 0;
52 static char show_textrel = 0;
53 static char show_rpath = 0;
54 static char show_needed = 0;
55 static char show_interp = 0;
56 static char show_bind = 0;
57 static char show_soname = 0;
58 static char show_textrels = 0;
59 static char show_banner = 1;
60 static char be_quiet = 0;
61 static char be_verbose = 0;
62 static char be_wewy_wewy_quiet = 0;
63 static char *find_sym = NULL, *versioned_symname = NULL;
64 static char *find_lib = NULL;
65 static char *out_format = NULL;
66 static char *search_path = NULL;
67 static char gmatch = 0;
68
69
70 /* sub-funcs for scanelf_file() */
71 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
72 {
73 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
74 #define GET_SYMTABS(B) \
75 if (elf->elf_class == ELFCLASS ## B) { \
76 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
77 /* debug sections */ \
78 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
79 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
80 /* runtime sections */ \
81 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
82 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
83 if (symtab && dynsym) { \
84 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
85 } else { \
86 *sym = (void*)(symtab ? symtab : dynsym); \
87 } \
88 if (strtab && dynstr) { \
89 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
90 } else { \
91 *tab = (void*)(strtab ? strtab : dynstr); \
92 } \
93 }
94 GET_SYMTABS(32)
95 GET_SYMTABS(64)
96 }
97 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
98 {
99 static char ret[7];
100 unsigned long i, shown;
101
102 if (!show_pax) return NULL;
103
104 shown = 0;
105 memset(&ret, 0, sizeof(ret));
106
107 if (elf->phdr) {
108 #define SHOW_PAX(B) \
109 if (elf->elf_class == ELFCLASS ## B) { \
110 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
111 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
112 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
113 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
114 continue; \
115 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
116 continue; \
117 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
118 *found_pax = 1; \
119 ++shown; \
120 break; \
121 } \
122 }
123 SHOW_PAX(32)
124 SHOW_PAX(64)
125 }
126
127 /* fall back to EI_PAX if no PT_PAX was found */
128 if (!*ret) {
129 static char *paxflags;
130 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
131 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
132 *found_pax = 1;
133 return (be_wewy_wewy_quiet ? NULL : paxflags);
134 }
135 strncpy(ret, paxflags, sizeof(ret));
136 }
137
138 if (be_wewy_wewy_quiet || (be_quiet && !shown))
139 return NULL;
140 else
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, shown;
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 #define SHOW_PHDR(B) \
159 if (elf->elf_class == ELFCLASS ## B) { \
160 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
161 Elf ## B ## _Off offset; \
162 uint32_t flags, check_flags; \
163 if (elf->phdr != NULL) { \
164 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
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 offset = 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 offset = 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 offset = 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+offset, gnu_short_stack_flags(flags), 3); \
187 *found = 1; \
188 ++shown; \
189 } \
190 } else if (elf->shdr != NULL) { \
191 /* no program headers which means this is prob an object file */ \
192 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
193 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
194 check_flags = SHF_WRITE|SHF_EXECINSTR; \
195 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
196 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
197 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
198 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
199 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
200 flags = EGET(shdr[i].sh_flags); \
201 if (be_quiet && ((flags & check_flags) != check_flags)) \
202 continue; \
203 ++*found_phdr; \
204 shown = 1; \
205 if (flags & SHF_WRITE) ret[0] = 'W'; \
206 if (flags & SHF_ALLOC) ret[1] = 'A'; \
207 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
208 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
209 break; \
210 } \
211 } \
212 if (!multi_stack) { \
213 *found_phdr = 1; \
214 shown = 1; \
215 memcpy(ret, "!WX", 3); \
216 } \
217 } \
218 }
219 SHOW_PHDR(32)
220 SHOW_PHDR(64)
221
222 if (be_wewy_wewy_quiet || (be_quiet && !shown))
223 return NULL;
224 else
225 return ret;
226 }
227 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
228 {
229 static const char *ret = "TEXTREL";
230 unsigned long i;
231
232 if (!show_textrel && !show_textrels) return NULL;
233
234 if (elf->phdr) {
235 #define SHOW_TEXTREL(B) \
236 if (elf->elf_class == ELFCLASS ## B) { \
237 Elf ## B ## _Dyn *dyn; \
238 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
239 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
240 Elf ## B ## _Off offset; \
241 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
242 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
243 offset = EGET(phdr[i].p_offset); \
244 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
245 dyn = DYN ## B (elf->data + offset); \
246 while (EGET(dyn->d_tag) != DT_NULL) { \
247 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
248 *found_textrel = 1; \
249 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
250 return (be_wewy_wewy_quiet ? NULL : ret); \
251 } \
252 ++dyn; \
253 } \
254 } }
255 SHOW_TEXTREL(32)
256 SHOW_TEXTREL(64)
257 }
258
259 if (be_quiet || be_wewy_wewy_quiet)
260 return NULL;
261 else
262 return " - ";
263 }
264 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
265 {
266 unsigned long s, r, rmax;
267 void *symtab_void, *strtab_void, *text_void;
268
269 if (!show_textrels) return NULL;
270
271 /* don't search for TEXTREL's if the ELF doesn't have any */
272 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
273 if (!*found_textrel) return NULL;
274
275 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
276 text_void = elf_findsecbyname(elf, ".text");
277
278 if (symtab_void && strtab_void && text_void && elf->shdr) {
279 #define SHOW_TEXTRELS(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
282 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
283 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
284 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
285 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
286 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
287 uint ## B ## _t memsz = EGET(text->sh_size); \
288 Elf ## B ## _Rel *rel; \
289 Elf ## B ## _Rela *rela; \
290 /* search the section headers for relocations */ \
291 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
292 uint32_t sh_type = EGET(shdr[s].sh_type); \
293 if (sh_type == SHT_REL) { \
294 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
295 rela = NULL; \
296 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
297 } else if (sh_type == SHT_RELA) { \
298 rel = NULL; \
299 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
300 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
301 } else \
302 continue; \
303 /* now see if any of the relocs are in the .text */ \
304 for (r = 0; r < rmax; ++r) { \
305 unsigned long sym_max; \
306 Elf ## B ## _Addr offset_tmp; \
307 Elf ## B ## _Sym *func; \
308 Elf ## B ## _Sym *sym; \
309 Elf ## B ## _Addr r_offset; \
310 uint ## B ## _t r_info; \
311 if (sh_type == SHT_REL) { \
312 r_offset = EGET(rel[r].r_offset); \
313 r_info = EGET(rel[r].r_info); \
314 } else { \
315 r_offset = EGET(rela[r].r_offset); \
316 r_info = EGET(rela[r].r_info); \
317 } \
318 /* make sure this relocation is inside of the .text */ \
319 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
320 if (be_verbose <= 2) continue; \
321 } else \
322 *found_textrels = 1; \
323 /* locate this relocation symbol name */ \
324 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
325 sym_max = ELF ## B ## _R_SYM(r_info); \
326 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
327 sym += sym_max; \
328 else \
329 sym = NULL; \
330 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
331 /* show the raw details about this reloc */ \
332 printf(" %s: ", elf->base_filename); \
333 if (sym && sym->st_name) \
334 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
335 else \
336 printf("(memory/fake?)"); \
337 printf(" [0x%lX]", (unsigned long)r_offset); \
338 /* now try to find the closest symbol that this rel is probably in */ \
339 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
340 func = NULL; \
341 offset_tmp = 0; \
342 while (sym_max--) { \
343 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
344 func = sym; \
345 offset_tmp = EGET(sym->st_value); \
346 } \
347 ++sym; \
348 } \
349 printf(" in "); \
350 if (func && func->st_name) \
351 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
352 else \
353 printf("(NULL: fake?)"); \
354 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
355 } \
356 } }
357 SHOW_TEXTRELS(32)
358 SHOW_TEXTRELS(64)
359 }
360 if (!*found_textrels)
361 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
362
363 return NULL;
364 }
365
366 static void rpath_security_checks(elfobj *, char *);
367 static void rpath_security_checks(elfobj *elf, char *item) {
368 struct stat st;
369 switch (*item) {
370 case '/': break;
371 case '.':
372 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
373 break;
374 case '\0':
375 warnf("Security problem NULL RPATH in %s", elf->filename);
376 break;
377 case '$':
378 if (fstat(elf->fd, &st) != -1)
379 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
380 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
381 item, elf->filename, st.st_mode & 07777);
382 break;
383 default:
384 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
385 break;
386 }
387 }
388 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
389 {
390 unsigned long i, s;
391 char *rpath, *runpath, **r;
392 void *strtbl_void;
393
394 if (!show_rpath) return;
395
396 strtbl_void = elf_findsecbyname(elf, ".dynstr");
397 rpath = runpath = NULL;
398
399 if (elf->phdr && strtbl_void) {
400 #define SHOW_RPATH(B) \
401 if (elf->elf_class == ELFCLASS ## B) { \
402 Elf ## B ## _Dyn *dyn; \
403 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
404 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
405 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
406 Elf ## B ## _Off offset; \
407 Elf ## B ## _Xword word; \
408 /* Scan all the program headers */ \
409 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
410 /* Just scan dynamic headers */ \
411 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
412 offset = EGET(phdr[i].p_offset); \
413 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
414 /* Just scan dynamic RPATH/RUNPATH headers */ \
415 dyn = DYN ## B (elf->data + offset); \
416 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
417 if (word == DT_RPATH) { \
418 r = &rpath; \
419 } else if (word == DT_RUNPATH) { \
420 r = &runpath; \
421 } else { \
422 ++dyn; \
423 continue; \
424 } \
425 /* Verify the memory is somewhat sane */ \
426 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
427 if (offset < (Elf ## B ## _Off)elf->len) { \
428 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
429 *r = (char*)(elf->data + offset); \
430 /* If quiet, don't output paths in ld.so.conf */ \
431 if (be_quiet) { \
432 size_t len; \
433 char *start, *end; \
434 /* note that we only 'chop' off leading known paths. */ \
435 /* since *r is read-only memory, we can only move the ptr forward. */ \
436 start = *r; \
437 /* scan each path in : delimited list */ \
438 while (start) { \
439 rpath_security_checks(elf, start); \
440 end = strchr(start, ':'); \
441 len = (end ? abs(end - start) : strlen(start)); \
442 for (s = 0; ldpaths[s]; ++s) { \
443 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
444 *r = (end ? end + 1 : NULL); \
445 break; \
446 } \
447 } \
448 if (!*r || !ldpaths[s] || !end) \
449 start = NULL; \
450 else \
451 start = start + len + 1; \
452 } \
453 } \
454 if (*r) *found_rpath = 1; \
455 } \
456 ++dyn; \
457 } \
458 } }
459 SHOW_RPATH(32)
460 SHOW_RPATH(64)
461 }
462
463 if (be_wewy_wewy_quiet) return;
464
465 if (rpath && runpath) {
466 if (!strcmp(rpath, runpath)) {
467 xstrcat(ret, runpath, ret_len);
468 } else {
469 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
470 xchrcat(ret, '{', ret_len);
471 xstrcat(ret, rpath, ret_len);
472 xchrcat(ret, ',', ret_len);
473 xstrcat(ret, runpath, ret_len);
474 xchrcat(ret, '}', ret_len);
475 }
476 } else if (rpath || runpath)
477 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
478 else if (!be_quiet)
479 xstrcat(ret, " - ", ret_len);
480 }
481 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
482 {
483 unsigned long i;
484 char *needed;
485 void *strtbl_void;
486
487 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
488
489 strtbl_void = elf_findsecbyname(elf, ".dynstr");
490
491 if (elf->phdr && strtbl_void) {
492 #define SHOW_NEEDED(B) \
493 if (elf->elf_class == ELFCLASS ## B) { \
494 Elf ## B ## _Dyn *dyn; \
495 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
496 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
497 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
498 Elf ## B ## _Off offset; \
499 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
500 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
501 offset = EGET(phdr[i].p_offset); \
502 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
503 dyn = DYN ## B (elf->data + offset); \
504 while (EGET(dyn->d_tag) != DT_NULL) { \
505 if (EGET(dyn->d_tag) == DT_NEEDED) { \
506 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
507 if (offset >= (Elf ## B ## _Off)elf->len) { \
508 ++dyn; \
509 continue; \
510 } \
511 needed = (char*)(elf->data + offset); \
512 if (op == 0) { \
513 if (!be_wewy_wewy_quiet) { \
514 if (*found_needed) xchrcat(ret, ',', ret_len); \
515 xstrcat(ret, needed, ret_len); \
516 } \
517 *found_needed = 1; \
518 } else { \
519 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
520 *found_lib = 1; \
521 return (be_wewy_wewy_quiet ? NULL : needed); \
522 } \
523 } \
524 } \
525 ++dyn; \
526 } \
527 } }
528 SHOW_NEEDED(32)
529 SHOW_NEEDED(64)
530 if (op == 0 && !*found_needed && be_verbose)
531 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
532 }
533
534 return NULL;
535 }
536 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
537 {
538 void *strtbl_void;
539
540 if (!show_interp) return NULL;
541
542 strtbl_void = elf_findsecbyname(elf, ".interp");
543
544 if (strtbl_void) {
545 #define SHOW_INTERP(B) \
546 if (elf->elf_class == ELFCLASS ## B) { \
547 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
548 *found_interp = 1; \
549 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
550 }
551 SHOW_INTERP(32)
552 SHOW_INTERP(64)
553 }
554 return NULL;
555 }
556 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
557 {
558 unsigned long i;
559 struct stat s;
560
561 if (!show_bind) return NULL;
562 if (!elf->phdr) return NULL;
563
564 #define SHOW_BIND(B) \
565 if (elf->elf_class == ELFCLASS ## B) { \
566 Elf ## B ## _Dyn *dyn; \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Off offset; \
570 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
571 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
572 offset = EGET(phdr[i].p_offset); \
573 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
574 dyn = DYN ## B (elf->data + offset); \
575 while (EGET(dyn->d_tag) != DT_NULL) { \
576 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
577 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
578 { \
579 if (be_quiet) return NULL; \
580 *found_bind = 1; \
581 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
582 } \
583 ++dyn; \
584 } \
585 } \
586 }
587 SHOW_BIND(32)
588 SHOW_BIND(64)
589
590 if (be_wewy_wewy_quiet) return NULL;
591
592 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
593 return NULL;
594 } else {
595 *found_bind = 1;
596 return (char *) "LAZY";
597 }
598 }
599 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
600 {
601 unsigned long i;
602 char *soname;
603 void *strtbl_void;
604
605 if (!show_soname) return NULL;
606
607 strtbl_void = elf_findsecbyname(elf, ".dynstr");
608
609 if (elf->phdr && strtbl_void) {
610 #define SHOW_SONAME(B) \
611 if (elf->elf_class == ELFCLASS ## B) { \
612 Elf ## B ## _Dyn *dyn; \
613 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
614 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
615 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
616 Elf ## B ## _Off offset; \
617 /* only look for soname in shared objects */ \
618 if (ehdr->e_type != ET_DYN) \
619 return NULL; \
620 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
621 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
622 offset = EGET(phdr[i].p_offset); \
623 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
624 dyn = DYN ## B (elf->data + offset); \
625 while (EGET(dyn->d_tag) != DT_NULL) { \
626 if (EGET(dyn->d_tag) == DT_SONAME) { \
627 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
628 if (offset >= (Elf ## B ## _Off)elf->len) { \
629 ++dyn; \
630 continue; \
631 } \
632 soname = (char*)(elf->data + offset); \
633 *found_soname = 1; \
634 return (be_wewy_wewy_quiet ? NULL : soname); \
635 } \
636 ++dyn; \
637 } \
638 } }
639 SHOW_SONAME(32)
640 SHOW_SONAME(64)
641 }
642
643 return NULL;
644 }
645 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
646 {
647 unsigned long i;
648 void *symtab_void, *strtab_void;
649
650 if (!find_sym) return NULL;
651
652 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
653
654 if (symtab_void && strtab_void) {
655 #define FIND_SYM(B) \
656 if (elf->elf_class == ELFCLASS ## B) { \
657 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
658 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
659 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
660 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
661 char *symname; \
662 for (i = 0; i < cnt; ++i) { \
663 if (sym->st_name) { \
664 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
665 if (*find_sym == '*') { \
666 printf("%s(%s) %5lX %15s %s\n", \
667 ((*found_sym == 0) ? "\n\t" : "\t"), \
668 elf->base_filename, \
669 (unsigned long)sym->st_size, \
670 (char *)get_elfstttype(sym->st_info), \
671 symname); \
672 *found_sym = 1; \
673 } else if ((strcmp(find_sym, symname) == 0) || \
674 (strcmp(symname, versioned_symname) == 0)) \
675 (*found_sym)++; \
676 } \
677 ++sym; \
678 } }
679 FIND_SYM(32)
680 FIND_SYM(64)
681 }
682
683 if (be_wewy_wewy_quiet) return NULL;
684
685 if (*find_sym != '*' && *found_sym)
686 return find_sym;
687 if (be_quiet)
688 return NULL;
689 else
690 return (char *)" - ";
691 }
692 /* scan an elf file and show all the fun stuff */
693 #define prints(str) write(fileno(stdout), str, strlen(str))
694 static void scanelf_file(const char *filename)
695 {
696 unsigned long i;
697 char found_pax, found_phdr, found_relro, found_load, found_textrel,
698 found_rpath, found_needed, found_interp, found_bind, found_soname,
699 found_sym, found_lib, found_file, found_textrels;
700 elfobj *elf;
701 struct stat st;
702 static char *out_buffer = NULL;
703 static size_t out_len;
704
705 /* make sure 'filename' exists */
706 if (lstat(filename, &st) == -1) {
707 if (be_verbose > 2) printf("%s: does not exist\n", filename);
708 return;
709 }
710 /* always handle regular files and handle symlinked files if no -y */
711 if (S_ISLNK(st.st_mode)) {
712 if (!scan_symlink) return;
713 stat(filename, &st);
714 }
715 if (!S_ISREG(st.st_mode)) {
716 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
717 return;
718 }
719
720 found_pax = found_phdr = found_relro = found_load = found_textrel = \
721 found_rpath = found_needed = found_interp = found_bind = found_soname = \
722 found_sym = found_lib = found_file = found_textrels = 0;
723
724 /* verify this is real ELF */
725 if ((elf = readelf(filename)) == NULL) {
726 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
727 return;
728 }
729
730 if (be_verbose > 1)
731 printf("%s: scanning file {%s,%s}\n", filename,
732 get_elfeitype(EI_CLASS, elf->elf_class),
733 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
734 else if (be_verbose)
735 printf("%s: scanning file\n", filename);
736
737 /* init output buffer */
738 if (!out_buffer) {
739 out_len = sizeof(char) * 80;
740 out_buffer = (char*)xmalloc(out_len);
741 }
742 *out_buffer = '\0';
743
744 /* show the header */
745 if (!be_quiet && show_banner) {
746 for (i = 0; out_format[i]; ++i) {
747 if (!IS_MODIFIER(out_format[i])) continue;
748
749 switch (out_format[++i]) {
750 case '%': break;
751 case '#': break;
752 case 'F':
753 case 'p':
754 case 'f': prints("FILE "); found_file = 1; break;
755 case 'o': prints(" TYPE "); break;
756 case 'x': prints(" PAX "); break;
757 case 'e': prints("STK/REL/PTL "); break;
758 case 't': prints("TEXTREL "); break;
759 case 'r': prints("RPATH "); break;
760 case 'n': prints("NEEDED "); break;
761 case 'i': prints("INTERP "); break;
762 case 'b': prints("BIND "); break;
763 case 'S': prints("SONAME "); break;
764 case 's': prints("SYM "); break;
765 case 'N': prints("LIB "); break;
766 case 'T': prints("TEXTRELS "); break;
767 default: warnf("'%c' has no title ?", out_format[i]);
768 }
769 }
770 if (!found_file) prints("FILE ");
771 prints("\n");
772 found_file = 0;
773 show_banner = 0;
774 }
775
776 /* dump all the good stuff */
777 for (i = 0; out_format[i]; ++i) {
778 const char *out;
779 const char *tmp;
780
781 /* make sure we trim leading spaces in quiet mode */
782 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
783 *out_buffer = '\0';
784
785 if (!IS_MODIFIER(out_format[i])) {
786 xchrcat(&out_buffer, out_format[i], &out_len);
787 continue;
788 }
789
790 out = NULL;
791 be_wewy_wewy_quiet = (out_format[i] == '#');
792 switch (out_format[++i]) {
793 case '%':
794 case '#':
795 xchrcat(&out_buffer, out_format[i], &out_len); break;
796 case 'F':
797 found_file = 1;
798 if (be_wewy_wewy_quiet) break;
799 xstrcat(&out_buffer, filename, &out_len);
800 break;
801 case 'p':
802 found_file = 1;
803 if (be_wewy_wewy_quiet) break;
804 tmp = filename;
805 if (search_path) {
806 ssize_t len_search = strlen(search_path);
807 ssize_t len_file = strlen(filename);
808 if (!strncmp(filename, search_path, len_search) && \
809 len_file > len_search)
810 tmp += len_search;
811 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
812 }
813 xstrcat(&out_buffer, tmp, &out_len);
814 break;
815 case 'f':
816 found_file = 1;
817 if (be_wewy_wewy_quiet) break;
818 tmp = strrchr(filename, '/');
819 tmp = (tmp == NULL ? filename : tmp+1);
820 xstrcat(&out_buffer, tmp, &out_len);
821 break;
822 case 'o': out = get_elfetype(elf); break;
823 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
824 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
825 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
826 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
827 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
828 case 'n':
829 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
830 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
831 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
832 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
833 case 's': out = scanelf_file_sym(elf, &found_sym); break;
834 default: warnf("'%c' has no scan code?", out_format[i]);
835 }
836 if (out) xstrcat(&out_buffer, out, &out_len);
837 }
838
839 #define FOUND_SOMETHING() \
840 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
841 found_rpath || found_needed || found_interp || found_bind || \
842 found_soname || found_sym || found_lib || found_textrels)
843
844 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
845 xchrcat(&out_buffer, ' ', &out_len);
846 xstrcat(&out_buffer, filename, &out_len);
847 }
848 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
849 puts(out_buffer);
850 fflush(stdout);
851 }
852
853 unreadelf(elf);
854 }
855
856 /* scan a directory for ET_EXEC files and print when we find one */
857 static void scanelf_dir(const char *path)
858 {
859 register DIR *dir;
860 register struct dirent *dentry;
861 struct stat st_top, st;
862 char buf[_POSIX_PATH_MAX];
863 size_t pathlen = 0, len = 0;
864
865 /* make sure path exists */
866 if (lstat(path, &st_top) == -1) {
867 if (be_verbose > 2) printf("%s: does not exist\n", path);
868 return;
869 }
870
871 /* ok, if it isn't a directory, assume we can open it */
872 if (!S_ISDIR(st_top.st_mode)) {
873 scanelf_file(path);
874 return;
875 }
876
877 /* now scan the dir looking for fun stuff */
878 if ((dir = opendir(path)) == NULL) {
879 warnf("could not opendir %s: %s", path, strerror(errno));
880 return;
881 }
882 if (be_verbose) printf("%s: scanning dir\n", path);
883
884 pathlen = strlen(path);
885 while ((dentry = readdir(dir))) {
886 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
887 continue;
888 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
889 if (len >= sizeof(buf)) {
890 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
891 (unsigned long)len, (unsigned long)sizeof(buf));
892 continue;
893 }
894 sprintf(buf, "%s/%s", path, dentry->d_name);
895 if (lstat(buf, &st) != -1) {
896 if (S_ISREG(st.st_mode))
897 scanelf_file(buf);
898 else if (dir_recurse && S_ISDIR(st.st_mode)) {
899 if (dir_crossmount || (st_top.st_dev == st.st_dev))
900 scanelf_dir(buf);
901 }
902 }
903 }
904 closedir(dir);
905 }
906
907 static int scanelf_from_file(char *filename)
908 {
909 FILE *fp = NULL;
910 char *p;
911 char path[_POSIX_PATH_MAX];
912
913 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
914 fp = stdin;
915 else if ((fp = fopen(filename, "r")) == NULL)
916 return 1;
917
918 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
919 if ((p = strchr(path, '\n')) != NULL)
920 *p = 0;
921 search_path = path;
922 scanelf_dir(path);
923 }
924 if (fp != stdin)
925 fclose(fp);
926 return 0;
927 }
928
929 static void load_ld_so_conf()
930 {
931 FILE *fp = NULL;
932 char *p;
933 char path[_POSIX_PATH_MAX];
934 int i = 0;
935
936 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
937 return;
938
939 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
940 if (*path != '/')
941 continue;
942
943 if ((p = strrchr(path, '\r')) != NULL)
944 *p = 0;
945 if ((p = strchr(path, '\n')) != NULL)
946 *p = 0;
947
948 ldpaths[i++] = xstrdup(path);
949
950 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
951 break;
952 }
953 ldpaths[i] = NULL;
954
955 fclose(fp);
956 }
957
958 /* scan /etc/ld.so.conf for paths */
959 static void scanelf_ldpath()
960 {
961 char scan_l, scan_ul, scan_ull;
962 int i = 0;
963
964 if (!ldpaths[0])
965 err("Unable to load any paths from ld.so.conf");
966
967 scan_l = scan_ul = scan_ull = 0;
968
969 while (ldpaths[i]) {
970 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
971 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
972 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
973 scanelf_dir(ldpaths[i]);
974 ++i;
975 }
976
977 if (!scan_l) scanelf_dir("/lib");
978 if (!scan_ul) scanelf_dir("/usr/lib");
979 if (!scan_ull) scanelf_dir("/usr/local/lib");
980 }
981
982 /* scan env PATH for paths */
983 static void scanelf_envpath()
984 {
985 char *path, *p;
986
987 path = getenv("PATH");
988 if (!path)
989 err("PATH is not set in your env !");
990 path = xstrdup(path);
991
992 while ((p = strrchr(path, ':')) != NULL) {
993 scanelf_dir(p + 1);
994 *p = 0;
995 }
996
997 free(path);
998 }
999
1000
1001
1002 /* usage / invocation handling functions */
1003 #define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV"
1004 #define a_argument required_argument
1005 static struct option const long_opts[] = {
1006 {"path", no_argument, NULL, 'p'},
1007 {"ldpath", no_argument, NULL, 'l'},
1008 {"recursive", no_argument, NULL, 'R'},
1009 {"mount", no_argument, NULL, 'm'},
1010 {"symlink", no_argument, NULL, 'y'},
1011 {"pax", no_argument, NULL, 'x'},
1012 {"header", no_argument, NULL, 'e'},
1013 {"textrel", no_argument, NULL, 't'},
1014 {"rpath", no_argument, NULL, 'r'},
1015 {"needed", no_argument, NULL, 'n'},
1016 {"interp", no_argument, NULL, 'i'},
1017 {"bind", no_argument, NULL, 'b'},
1018 {"soname", no_argument, NULL, 'S'},
1019 {"symbol", a_argument, NULL, 's'},
1020 {"lib", a_argument, NULL, 'N'},
1021 {"gmatch", no_argument, NULL, 'g'},
1022 {"textrels", no_argument, NULL, 'T'},
1023 {"all", no_argument, NULL, 'a'},
1024 {"quiet", no_argument, NULL, 'q'},
1025 {"verbose", no_argument, NULL, 'v'},
1026 {"format", a_argument, NULL, 'F'},
1027 {"from", a_argument, NULL, 'f'},
1028 {"file", a_argument, NULL, 'o'},
1029 {"nobanner", no_argument, NULL, 'B'},
1030 {"help", no_argument, NULL, 'h'},
1031 {"version", no_argument, NULL, 'V'},
1032 {NULL, no_argument, NULL, 0x0}
1033 };
1034
1035 static const char *opts_help[] = {
1036 "Scan all directories in PATH environment",
1037 "Scan all directories in /etc/ld.so.conf",
1038 "Scan directories recursively",
1039 "Don't recursively cross mount points",
1040 "Don't scan symlinks\n",
1041 "Print PaX markings",
1042 "Print GNU_STACK/PT_LOAD markings",
1043 "Print TEXTREL information",
1044 "Print RPATH information",
1045 "Print NEEDED information",
1046 "Print INTERP information",
1047 "Print BIND information",
1048 "Print SONAME information",
1049 "Find a specified symbol",
1050 "Find a specified library",
1051 "Use strncmp to match libraries. (use with -N)",
1052 "Locate cause of TEXTREL",
1053 "Print all scanned info (-x -e -t -r -b)\n",
1054 "Only output 'bad' things",
1055 "Be verbose (can be specified more than once)",
1056 "Use specified format for output",
1057 "Read input stream from a filename",
1058 "Write output stream to a filename",
1059 "Don't display the header",
1060 "Print this help and exit",
1061 "Print version and exit",
1062 NULL
1063 };
1064
1065 /* display usage and exit */
1066 static void usage(int status)
1067 {
1068 unsigned long i;
1069 printf("* Scan ELF binaries for stuff\n\n"
1070 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1071 printf("Options: -[%s]\n", PARSE_FLAGS);
1072 for (i = 0; long_opts[i].name; ++i)
1073 if (long_opts[i].has_arg == no_argument)
1074 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1075 long_opts[i].name, opts_help[i]);
1076 else
1077 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1078 long_opts[i].name, opts_help[i]);
1079
1080 if (status != EXIT_SUCCESS)
1081 exit(status);
1082
1083 puts("\nThe format modifiers for the -F option are:");
1084 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1085 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1086 puts(" i INTERP \tb BIND \ts symbol");
1087 puts(" N library \to Type \tT TEXTRELs");
1088 puts(" S SONAME");
1089 puts(" p filename (with search path removed)");
1090 puts(" f filename (short name/basename)");
1091 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1092
1093 exit(status);
1094 }
1095
1096 /* parse command line arguments and preform needed actions */
1097 static void parseargs(int argc, char *argv[])
1098 {
1099 int i;
1100 char *from_file = NULL;
1101
1102 opterr = 0;
1103 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1104 switch (i) {
1105
1106 case 'V':
1107 printf("pax-utils-%s: %s compiled %s\n%s\n"
1108 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1109 VERSION, __FILE__, __DATE__, rcsid, argv0);
1110 exit(EXIT_SUCCESS);
1111 break;
1112 case 'h': usage(EXIT_SUCCESS); break;
1113 case 'f':
1114 if (from_file) err("Don't specify -f twice");
1115 from_file = xstrdup(optarg);
1116 break;
1117 case 'o': {
1118 FILE *fp = NULL;
1119 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1120 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1121 SET_STDOUT(fp);
1122 break;
1123 }
1124
1125 case 's': {
1126 if (find_sym) warn("You prob don't want to specify -s twice");
1127 find_sym = optarg;
1128 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1129 sprintf(versioned_symname, "%s@", find_sym);
1130 break;
1131 }
1132 case 'N': {
1133 if (find_lib) warn("You prob don't want to specify -N twice");
1134 find_lib = optarg;
1135 break;
1136 }
1137
1138 case 'F': {
1139 if (out_format) warn("You prob don't want to specify -F twice");
1140 out_format = optarg;
1141 break;
1142 }
1143
1144 case 'g': gmatch = 1;
1145 case 'y': scan_symlink = 0; break;
1146 case 'B': show_banner = 0; break;
1147 case 'l': scan_ldpath = 1; break;
1148 case 'p': scan_envpath = 1; break;
1149 case 'R': dir_recurse = 1; break;
1150 case 'm': dir_crossmount = 0; break;
1151 case 'x': show_pax = 1; break;
1152 case 'e': show_phdr = 1; break;
1153 case 't': show_textrel = 1; break;
1154 case 'r': show_rpath = 1; break;
1155 case 'n': show_needed = 1; break;
1156 case 'i': show_interp = 1; break;
1157 case 'b': show_bind = 1; break;
1158 case 'S': show_soname = 1; break;
1159 case 'T': show_textrels = 1; break;
1160 case 'q': be_quiet = 1; break;
1161 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1162 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1163
1164 case ':':
1165 err("Option missing parameter\n");
1166 case '?':
1167 err("Unknown option\n");
1168 default:
1169 err("Unhandled option '%c'", i);
1170 }
1171 }
1172
1173 /* let the format option override all other options */
1174 if (out_format) {
1175 show_pax = show_phdr = show_textrel = show_rpath = \
1176 show_needed = show_interp = show_bind = show_soname = \
1177 show_textrels = 0;
1178 for (i = 0; out_format[i]; ++i) {
1179 if (!IS_MODIFIER(out_format[i])) continue;
1180
1181 switch (out_format[++i]) {
1182 case '%': break;
1183 case '#': break;
1184 case 'F': break;
1185 case 'p': break;
1186 case 'f': break;
1187 case 's': break;
1188 case 'N': break;
1189 case 'o': break;
1190 case 'x': show_pax = 1; break;
1191 case 'e': show_phdr = 1; break;
1192 case 't': show_textrel = 1; break;
1193 case 'r': show_rpath = 1; break;
1194 case 'n': show_needed = 1; break;
1195 case 'i': show_interp = 1; break;
1196 case 'b': show_bind = 1; break;
1197 case 'S': show_soname = 1; break;
1198 case 'T': show_textrels = 1; break;
1199 default:
1200 err("Invalid format specifier '%c' (byte %i)",
1201 out_format[i], i+1);
1202 }
1203 }
1204
1205 /* construct our default format */
1206 } else {
1207 size_t fmt_len = 30;
1208 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1209 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1210 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1211 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1212 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1213 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1214 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1215 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1216 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1217 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1218 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1219 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1220 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1221 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1222 }
1223 if (be_verbose > 2) printf("Format: %s\n", out_format);
1224
1225 /* now lets actually do the scanning */
1226 if (scan_ldpath || (show_rpath && be_quiet))
1227 load_ld_so_conf();
1228 if (scan_ldpath) scanelf_ldpath();
1229 if (scan_envpath) scanelf_envpath();
1230 if (from_file) {
1231 scanelf_from_file(from_file);
1232 free(from_file);
1233 from_file = *argv;
1234 }
1235 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1236 err("Nothing to scan !?");
1237 while (optind < argc) {
1238 search_path = argv[optind++];
1239 scanelf_dir(search_path);
1240 }
1241
1242 /* clean up */
1243 if (versioned_symname) free(versioned_symname);
1244 for (i = 0; ldpaths[i]; ++i)
1245 free(ldpaths[i]);
1246 }
1247
1248
1249
1250 /* utility funcs */
1251 static char *xstrdup(const char *s)
1252 {
1253 char *ret = strdup(s);
1254 if (!ret) err("Could not strdup(): %s", strerror(errno));
1255 return ret;
1256 }
1257
1258 static void *xmalloc(size_t size)
1259 {
1260 void *ret = malloc(size);
1261 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1262 return ret;
1263 }
1264
1265 static void xstrcat(char **dst, const char *src, size_t *curr_len)
1266 {
1267 size_t new_len;
1268
1269 new_len = strlen(*dst) + strlen(src);
1270 if (*curr_len <= new_len) {
1271 *curr_len = new_len + (*curr_len / 2);
1272 *dst = realloc(*dst, *curr_len);
1273 if (!*dst)
1274 err("could not realloc %li bytes", (unsigned long)*curr_len);
1275 }
1276
1277 strcat(*dst, src);
1278 }
1279
1280 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1281 {
1282 static char my_app[2];
1283 my_app[0] = append;
1284 my_app[1] = '\0';
1285 xstrcat(dst, my_app, curr_len);
1286 }
1287
1288
1289
1290 int main(int argc, char *argv[])
1291 {
1292 if (argc < 2)
1293 usage(EXIT_FAILURE);
1294 parseargs(argc, argv);
1295 fclose(stdout);
1296 #ifdef __BOUNDS_CHECKING_ON
1297 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1298 #endif
1299 return EXIT_SUCCESS;
1300 }

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