/[gentoo-projects]/pax-utils/scanelf.c
Gentoo

Contents of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.105 - (show annotations) (download) (as text)
Fri Jan 13 12:12:52 2006 UTC (8 years, 11 months ago) by vapier
Branch: MAIN
Changes since 1.104: +50 -24 lines
File MIME type: text/x-csrc
initial support for reading archive files (*.a)

1 /*
2 * Copyright 2003-2006 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 1.103 2006/01/11 23:46:21 vapier Exp $
5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 #include "paxinc.h"
11
12 static const char *rcsid = "$Id: scanelf.c,v 1.103 2006/01/11 23:46:21 vapier Exp $";
13 #define argv0 "scanelf"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#')
16
17
18
19 /* prototypes */
20 static int scanelf_elf(const char *filename);
21 static int scanelf_archive(const char *filename);
22 static void scanelf_file(const char *filename);
23 static void scanelf_dir(const char *path);
24 static void scanelf_ldpath();
25 static void scanelf_envpath();
26 static void usage(int status);
27 static void parseargs(int argc, char *argv[]);
28 static char *xstrdup(const char *s);
29 static void *xmalloc(size_t size);
30 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
31 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
32 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
33
34 /* variables to control behavior */
35 static char *ldpaths[256];
36 static char scan_ldpath = 0;
37 static char scan_envpath = 0;
38 static char scan_symlink = 1;
39 static char scan_archives = 0;
40 static char dir_recurse = 0;
41 static char dir_crossmount = 1;
42 static char show_pax = 0;
43 static char show_phdr = 0;
44 static char show_textrel = 0;
45 static char show_rpath = 0;
46 static char show_needed = 0;
47 static char show_interp = 0;
48 static char show_bind = 0;
49 static char show_soname = 0;
50 static char show_textrels = 0;
51 static char show_banner = 1;
52 static char be_quiet = 0;
53 static char be_verbose = 0;
54 static char be_wewy_wewy_quiet = 0;
55 static char *find_sym = NULL, *versioned_symname = NULL;
56 static char *find_lib = NULL;
57 static char *out_format = NULL;
58 static char *search_path = NULL;
59 static char fix_elf = 0;
60 static char gmatch = 0;
61 static char use_ldcache = 0;
62
63
64 caddr_t ldcache = 0;
65 size_t ldcache_size = 0;
66
67 /* sub-funcs for scanelf_file() */
68 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
69 {
70 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
71 #define GET_SYMTABS(B) \
72 if (elf->elf_class == ELFCLASS ## B) { \
73 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
74 /* debug sections */ \
75 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
76 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
77 /* runtime sections */ \
78 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
79 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
80 if (symtab && dynsym) { \
81 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
82 } else { \
83 *sym = (void*)(symtab ? symtab : dynsym); \
84 } \
85 if (strtab && dynstr) { \
86 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
87 } else { \
88 *tab = (void*)(strtab ? strtab : dynstr); \
89 } \
90 }
91 GET_SYMTABS(32)
92 GET_SYMTABS(64)
93 }
94 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
95 {
96 static char ret[7];
97 unsigned long i, shown;
98
99 if (!show_pax) return NULL;
100
101 shown = 0;
102 memset(&ret, 0, sizeof(ret));
103
104 if (elf->phdr) {
105 #define SHOW_PAX(B) \
106 if (elf->elf_class == ELFCLASS ## B) { \
107 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
108 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
109 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
110 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
111 continue; \
112 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
113 continue; \
114 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
115 *found_pax = 1; \
116 ++shown; \
117 break; \
118 } \
119 }
120 SHOW_PAX(32)
121 SHOW_PAX(64)
122 }
123
124 /* fall back to EI_PAX if no PT_PAX was found */
125 if (!*ret) {
126 static char *paxflags;
127 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
128 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
129 *found_pax = 1;
130 return (be_wewy_wewy_quiet ? NULL : paxflags);
131 }
132 strncpy(ret, paxflags, sizeof(ret));
133 }
134
135 if (be_wewy_wewy_quiet || (be_quiet && !shown))
136 return NULL;
137 else
138 return ret;
139 }
140
141 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
142 {
143 static char ret[12];
144 char *found;
145 unsigned long i, shown, multi_stack, multi_relro, multi_load;
146 int max_pt_load;
147
148 if (!show_phdr) return NULL;
149
150 memcpy(ret, "--- --- ---\0", 12);
151
152 shown = 0;
153 multi_stack = multi_relro = multi_load = 0;
154 max_pt_load = elf_max_pt_load(elf);
155
156 #define SHOW_PHDR(B) \
157 if (elf->elf_class == ELFCLASS ## B) { \
158 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
159 Elf ## B ## _Off offset; \
160 uint32_t flags, check_flags; \
161 if (elf->phdr != NULL) { \
162 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
163 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
164 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
165 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
166 found = found_phdr; \
167 offset = 0; \
168 check_flags = PF_X; \
169 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
170 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
171 found = found_relro; \
172 offset = 4; \
173 check_flags = PF_X; \
174 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
175 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
176 found = found_load; \
177 offset = 8; \
178 check_flags = PF_W|PF_X; \
179 } else \
180 continue; \
181 flags = EGET(phdr[i].p_flags); \
182 if (be_quiet && ((flags & check_flags) != check_flags)) \
183 continue; \
184 if (fix_elf && ((flags & PF_X) != flags)) { \
185 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
186 ret[3] = ret[7] = '!'; \
187 flags = EGET(phdr[i].p_flags); \
188 } \
189 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
190 *found = 1; \
191 ++shown; \
192 } \
193 } else if (elf->shdr != NULL) { \
194 /* no program headers which means this is prob an object file */ \
195 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
196 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
197 check_flags = SHF_WRITE|SHF_EXECINSTR; \
198 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
199 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
200 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
201 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
202 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
203 flags = EGET(shdr[i].sh_flags); \
204 if (be_quiet && ((flags & check_flags) != check_flags)) \
205 continue; \
206 ++*found_phdr; \
207 shown = 1; \
208 if (flags & SHF_WRITE) ret[0] = 'W'; \
209 if (flags & SHF_ALLOC) ret[1] = 'A'; \
210 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
211 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
212 break; \
213 } \
214 } \
215 if (!multi_stack) { \
216 *found_phdr = 1; \
217 shown = 1; \
218 memcpy(ret, "!WX", 3); \
219 } \
220 } \
221 }
222 SHOW_PHDR(32)
223 SHOW_PHDR(64)
224
225 if (be_wewy_wewy_quiet || (be_quiet && !shown))
226 return NULL;
227 else
228 return ret;
229 }
230 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
231 {
232 static const char *ret = "TEXTREL";
233 unsigned long i;
234
235 if (!show_textrel && !show_textrels) return NULL;
236
237 if (elf->phdr) {
238 #define SHOW_TEXTREL(B) \
239 if (elf->elf_class == ELFCLASS ## B) { \
240 Elf ## B ## _Dyn *dyn; \
241 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
242 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
243 Elf ## B ## _Off offset; \
244 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
245 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
246 offset = EGET(phdr[i].p_offset); \
247 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
248 dyn = DYN ## B (elf->data + offset); \
249 while (EGET(dyn->d_tag) != DT_NULL) { \
250 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
251 *found_textrel = 1; \
252 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
253 return (be_wewy_wewy_quiet ? NULL : ret); \
254 } \
255 ++dyn; \
256 } \
257 } }
258 SHOW_TEXTREL(32)
259 SHOW_TEXTREL(64)
260 }
261
262 if (be_quiet || be_wewy_wewy_quiet)
263 return NULL;
264 else
265 return " - ";
266 }
267 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
268 {
269 unsigned long s, r, rmax;
270 void *symtab_void, *strtab_void, *text_void;
271
272 if (!show_textrels) return NULL;
273
274 /* don't search for TEXTREL's if the ELF doesn't have any */
275 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
276 if (!*found_textrel) return NULL;
277
278 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
279 text_void = elf_findsecbyname(elf, ".text");
280
281 if (symtab_void && strtab_void && text_void && elf->shdr) {
282 #define SHOW_TEXTRELS(B) \
283 if (elf->elf_class == ELFCLASS ## B) { \
284 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
285 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
286 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
287 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
288 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
289 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
290 uint ## B ## _t memsz = EGET(text->sh_size); \
291 Elf ## B ## _Rel *rel; \
292 Elf ## B ## _Rela *rela; \
293 /* search the section headers for relocations */ \
294 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
295 uint32_t sh_type = EGET(shdr[s].sh_type); \
296 if (sh_type == SHT_REL) { \
297 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
298 rela = NULL; \
299 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
300 } else if (sh_type == SHT_RELA) { \
301 rel = NULL; \
302 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
303 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
304 } else \
305 continue; \
306 /* now see if any of the relocs are in the .text */ \
307 for (r = 0; r < rmax; ++r) { \
308 unsigned long sym_max; \
309 Elf ## B ## _Addr offset_tmp; \
310 Elf ## B ## _Sym *func; \
311 Elf ## B ## _Sym *sym; \
312 Elf ## B ## _Addr r_offset; \
313 uint ## B ## _t r_info; \
314 if (sh_type == SHT_REL) { \
315 r_offset = EGET(rel[r].r_offset); \
316 r_info = EGET(rel[r].r_info); \
317 } else { \
318 r_offset = EGET(rela[r].r_offset); \
319 r_info = EGET(rela[r].r_info); \
320 } \
321 /* make sure this relocation is inside of the .text */ \
322 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
323 if (be_verbose <= 2) continue; \
324 } else \
325 *found_textrels = 1; \
326 /* locate this relocation symbol name */ \
327 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
328 sym_max = ELF ## B ## _R_SYM(r_info); \
329 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
330 sym += sym_max; \
331 else \
332 sym = NULL; \
333 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
334 /* show the raw details about this reloc */ \
335 printf(" %s: ", elf->base_filename); \
336 if (sym && sym->st_name) \
337 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
338 else \
339 printf("(memory/fake?)"); \
340 printf(" [0x%lX]", (unsigned long)r_offset); \
341 /* now try to find the closest symbol that this rel is probably in */ \
342 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
343 func = NULL; \
344 offset_tmp = 0; \
345 while (sym_max--) { \
346 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
347 func = sym; \
348 offset_tmp = EGET(sym->st_value); \
349 } \
350 ++sym; \
351 } \
352 printf(" in "); \
353 if (func && func->st_name) \
354 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
355 else \
356 printf("(NULL: fake?)"); \
357 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
358 } \
359 } }
360 SHOW_TEXTRELS(32)
361 SHOW_TEXTRELS(64)
362 }
363 if (!*found_textrels)
364 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
365
366 return NULL;
367 }
368
369 static void rpath_security_checks(elfobj *, char *, const char *);
370 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
371 {
372 struct stat st;
373 switch (*item) {
374 case '/': break;
375 case '.':
376 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
377 break;
378 case ':':
379 case '\0':
380 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
381 break;
382 case '$':
383 if (fstat(elf->fd, &st) != -1)
384 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
385 warnf("Security problem with %s='%s' in %s with mode set of %o",
386 dt_type, item, elf->filename, st.st_mode & 07777);
387 break;
388 default:
389 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
390 break;
391 }
392 }
393 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
394 {
395 unsigned long i, s;
396 char *rpath, *runpath, **r;
397 void *strtbl_void;
398
399 if (!show_rpath) return;
400
401 strtbl_void = elf_findsecbyname(elf, ".dynstr");
402 rpath = runpath = NULL;
403
404 if (elf->phdr && strtbl_void) {
405 #define SHOW_RPATH(B) \
406 if (elf->elf_class == ELFCLASS ## B) { \
407 Elf ## B ## _Dyn *dyn; \
408 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
409 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
410 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
411 Elf ## B ## _Off offset; \
412 Elf ## B ## _Xword word; \
413 /* Scan all the program headers */ \
414 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
415 /* Just scan dynamic headers */ \
416 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
417 offset = EGET(phdr[i].p_offset); \
418 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
419 /* Just scan dynamic RPATH/RUNPATH headers */ \
420 dyn = DYN ## B (elf->data + offset); \
421 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
422 if (word == DT_RPATH) { \
423 r = &rpath; \
424 } else if (word == DT_RUNPATH) { \
425 r = &runpath; \
426 } else { \
427 ++dyn; \
428 continue; \
429 } \
430 /* Verify the memory is somewhat sane */ \
431 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
432 if (offset < (Elf ## B ## _Off)elf->len) { \
433 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
434 *r = (char*)(elf->data + offset); \
435 /* cache the length in case we need to nuke this section later on */ \
436 if (fix_elf) \
437 offset = strlen(*r); \
438 /* If quiet, don't output paths in ld.so.conf */ \
439 if (be_quiet) { \
440 size_t len; \
441 char *start, *end; \
442 /* note that we only 'chop' off leading known paths. */ \
443 /* since *r is read-only memory, we can only move the ptr forward. */ \
444 start = *r; \
445 /* scan each path in : delimited list */ \
446 while (start) { \
447 rpath_security_checks(elf, start, get_elfdtype(word)); \
448 end = strchr(start, ':'); \
449 len = (end ? abs(end - start) : strlen(start)); \
450 if (use_ldcache) \
451 for (s = 0; ldpaths[s]; ++s) \
452 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
453 *r = end; \
454 /* corner case ... if RPATH reads "/usr/lib:", we want \
455 * to show ':' rather than '' */ \
456 if (end && end[1] != '\0') \
457 (*r)++; \
458 break; \
459 } \
460 if (!*r || !end) \
461 break; \
462 else \
463 start = start + len + 1; \
464 } \
465 } \
466 if (*r) { \
467 if (fix_elf > 2 || **r == '\0') { \
468 /* just nuke it */ \
469 nuke_it##B: \
470 memset(*r, 0x00, offset); \
471 *r = NULL; \
472 ESET(dyn->d_tag, DT_DEBUG); \
473 ESET(dyn->d_un.d_ptr, 0); \
474 } else if (fix_elf) { \
475 /* try to clean "bad" paths */ \
476 size_t len, tmpdir_len; \
477 char *start, *end; \
478 const char *tmpdir; \
479 start = *r; \
480 tmpdir = (getenv("TMPDIR") ? : "."); \
481 tmpdir_len = strlen(tmpdir); \
482 while (1) { \
483 end = strchr(start, ':'); \
484 if (start == end) { \
485 eat_this_path##B: \
486 len = strlen(end); \
487 memmove(start, end+1, len); \
488 start[len-1] = '\0'; \
489 end = start - 1; \
490 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
491 if (!end) { \
492 if (start == *r) \
493 goto nuke_it##B; \
494 *--start = '\0'; \
495 } else \
496 goto eat_this_path##B; \
497 } \
498 if (!end) \
499 break; \
500 start = end + 1; \
501 } \
502 if (**r == '\0') \
503 goto nuke_it##B; \
504 } \
505 if (*r) \
506 *found_rpath = 1; \
507 } \
508 } \
509 ++dyn; \
510 } \
511 } }
512 SHOW_RPATH(32)
513 SHOW_RPATH(64)
514 }
515
516 if (be_wewy_wewy_quiet) return;
517
518 if (rpath && runpath) {
519 if (!strcmp(rpath, runpath)) {
520 xstrcat(ret, runpath, ret_len);
521 } else {
522 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
523 xchrcat(ret, '{', ret_len);
524 xstrcat(ret, rpath, ret_len);
525 xchrcat(ret, ',', ret_len);
526 xstrcat(ret, runpath, ret_len);
527 xchrcat(ret, '}', ret_len);
528 }
529 } else if (rpath || runpath)
530 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
531 else if (!be_quiet)
532 xstrcat(ret, " - ", ret_len);
533 }
534
535 #define LDSO_CACHE_MAGIC "ld.so-"
536 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
537 #define LDSO_CACHE_VER "1.7.0"
538 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
539 #define FLAG_ANY -1
540 #define FLAG_TYPE_MASK 0x00ff
541 #define FLAG_LIBC4 0x0000
542 #define FLAG_ELF 0x0001
543 #define FLAG_ELF_LIBC5 0x0002
544 #define FLAG_ELF_LIBC6 0x0003
545 #define FLAG_REQUIRED_MASK 0xff00
546 #define FLAG_SPARC_LIB64 0x0100
547 #define FLAG_IA64_LIB64 0x0200
548 #define FLAG_X8664_LIB64 0x0300
549 #define FLAG_S390_LIB64 0x0400
550 #define FLAG_POWERPC_LIB64 0x0500
551 #define FLAG_MIPS64_LIBN32 0x0600
552 #define FLAG_MIPS64_LIBN64 0x0700
553
554 static char *lookup_cache_lib(elfobj *, char *);
555 static char *lookup_cache_lib(elfobj *elf, char *fname)
556 {
557 int fd = 0;
558 char *strs;
559 static char buf[__PAX_UTILS_PATH_MAX] = "";
560 const char *cachefile = "/etc/ld.so.cache";
561 struct stat st;
562
563 typedef struct {
564 char magic[LDSO_CACHE_MAGIC_LEN];
565 char version[LDSO_CACHE_VER_LEN];
566 int nlibs;
567 } header_t;
568 header_t *header;
569
570 typedef struct {
571 int flags;
572 int sooffset;
573 int liboffset;
574 } libentry_t;
575 libentry_t *libent;
576
577 if (fname == NULL)
578 return NULL;
579
580 if (ldcache == 0) {
581 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
582 return NULL;
583
584 /* cache these values so we only map/unmap the cache file once */
585 ldcache_size = st.st_size;
586 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
587
588 close(fd);
589
590 if (ldcache == (caddr_t)-1)
591 return NULL;
592
593 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
594 return NULL;
595 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
596 return NULL;
597 }
598
599 header = (header_t *) ldcache;
600 libent = (libentry_t *) (ldcache + sizeof(header_t));
601 strs = (char *) &libent[header->nlibs];
602
603 for (fd = 0; fd < header->nlibs; fd++) {
604 /* this should be more fine grained, but for now we assume that
605 * diff arches will not be cached together. and we ignore the
606 * the different multilib mips cases. */
607 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
608 continue;
609 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
610 continue;
611
612 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
613 continue;
614 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
615 }
616 return buf;
617 }
618
619
620 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
621 {
622 unsigned long i;
623 char *needed;
624 void *strtbl_void;
625 char *p;
626
627 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
628
629 strtbl_void = elf_findsecbyname(elf, ".dynstr");
630
631 if (elf->phdr && strtbl_void) {
632 #define SHOW_NEEDED(B) \
633 if (elf->elf_class == ELFCLASS ## B) { \
634 Elf ## B ## _Dyn *dyn; \
635 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
636 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
637 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
638 Elf ## B ## _Off offset; \
639 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
640 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
641 offset = EGET(phdr[i].p_offset); \
642 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
643 dyn = DYN ## B (elf->data + offset); \
644 while (EGET(dyn->d_tag) != DT_NULL) { \
645 if (EGET(dyn->d_tag) == DT_NEEDED) { \
646 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
647 if (offset >= (Elf ## B ## _Off)elf->len) { \
648 ++dyn; \
649 continue; \
650 } \
651 needed = (char*)(elf->data + offset); \
652 if (op == 0) { \
653 if (!be_wewy_wewy_quiet) { \
654 if (*found_needed) xchrcat(ret, ',', ret_len); \
655 if (use_ldcache) \
656 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
657 needed = p; \
658 xstrcat(ret, needed, ret_len); \
659 } \
660 *found_needed = 1; \
661 } else { \
662 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
663 *found_lib = 1; \
664 return (be_wewy_wewy_quiet ? NULL : needed); \
665 } \
666 } \
667 } \
668 ++dyn; \
669 } \
670 } }
671 SHOW_NEEDED(32)
672 SHOW_NEEDED(64)
673 if (op == 0 && !*found_needed && be_verbose)
674 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
675 }
676
677 return NULL;
678 }
679 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
680 {
681 void *strtbl_void;
682
683 if (!show_interp) return NULL;
684
685 strtbl_void = elf_findsecbyname(elf, ".interp");
686
687 if (strtbl_void) {
688 #define SHOW_INTERP(B) \
689 if (elf->elf_class == ELFCLASS ## B) { \
690 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
691 *found_interp = 1; \
692 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
693 }
694 SHOW_INTERP(32)
695 SHOW_INTERP(64)
696 }
697 return NULL;
698 }
699 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
700 {
701 unsigned long i;
702 struct stat s;
703
704 if (!show_bind) return NULL;
705 if (!elf->phdr) return NULL;
706
707 #define SHOW_BIND(B) \
708 if (elf->elf_class == ELFCLASS ## B) { \
709 Elf ## B ## _Dyn *dyn; \
710 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
711 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
712 Elf ## B ## _Off offset; \
713 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
714 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
715 offset = EGET(phdr[i].p_offset); \
716 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
717 dyn = DYN ## B (elf->data + offset); \
718 while (EGET(dyn->d_tag) != DT_NULL) { \
719 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
720 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
721 { \
722 if (be_quiet) return NULL; \
723 *found_bind = 1; \
724 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
725 } \
726 ++dyn; \
727 } \
728 } \
729 }
730 SHOW_BIND(32)
731 SHOW_BIND(64)
732
733 if (be_wewy_wewy_quiet) return NULL;
734
735 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
736 return NULL;
737 } else {
738 *found_bind = 1;
739 return (char *) "LAZY";
740 }
741 }
742 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
743 {
744 unsigned long i;
745 char *soname;
746 void *strtbl_void;
747
748 if (!show_soname) return NULL;
749
750 strtbl_void = elf_findsecbyname(elf, ".dynstr");
751
752 if (elf->phdr && strtbl_void) {
753 #define SHOW_SONAME(B) \
754 if (elf->elf_class == ELFCLASS ## B) { \
755 Elf ## B ## _Dyn *dyn; \
756 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
757 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
758 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
759 Elf ## B ## _Off offset; \
760 /* only look for soname in shared objects */ \
761 if (ehdr->e_type != ET_DYN) \
762 return NULL; \
763 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
764 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
765 offset = EGET(phdr[i].p_offset); \
766 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
767 dyn = DYN ## B (elf->data + offset); \
768 while (EGET(dyn->d_tag) != DT_NULL) { \
769 if (EGET(dyn->d_tag) == DT_SONAME) { \
770 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
771 if (offset >= (Elf ## B ## _Off)elf->len) { \
772 ++dyn; \
773 continue; \
774 } \
775 soname = (char*)(elf->data + offset); \
776 *found_soname = 1; \
777 return (be_wewy_wewy_quiet ? NULL : soname); \
778 } \
779 ++dyn; \
780 } \
781 } }
782 SHOW_SONAME(32)
783 SHOW_SONAME(64)
784 }
785
786 return NULL;
787 }
788 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
789 {
790 unsigned long i;
791 char *ret;
792 void *symtab_void, *strtab_void;
793
794 if (!find_sym) return NULL;
795 ret = find_sym;
796
797 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
798
799 if (symtab_void && strtab_void) {
800 #define FIND_SYM(B) \
801 if (elf->elf_class == ELFCLASS ## B) { \
802 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
803 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
804 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
805 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
806 char *symname; \
807 for (i = 0; i < cnt; ++i) { \
808 if (sym->st_name) { \
809 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
810 if (*find_sym == '*') { \
811 printf("%s(%s) %5lX %15s %s\n", \
812 ((*found_sym == 0) ? "\n\t" : "\t"), \
813 elf->base_filename, \
814 (unsigned long)sym->st_size, \
815 get_elfstttype(sym->st_info), \
816 symname); \
817 *found_sym = 1; \
818 } else { \
819 char *this_sym, *next_sym; \
820 this_sym = find_sym; \
821 do { \
822 next_sym = strchr(this_sym, ','); \
823 if (next_sym == NULL) \
824 next_sym = this_sym + strlen(this_sym); \
825 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
826 (strcmp(symname, versioned_symname) == 0)) { \
827 ret = this_sym; \
828 (*found_sym)++; \
829 goto break_out; \
830 } \
831 this_sym = next_sym + 1; \
832 } while (*next_sym != '\0'); \
833 } \
834 } \
835 ++sym; \
836 } }
837 FIND_SYM(32)
838 FIND_SYM(64)
839 }
840
841 break_out:
842 if (be_wewy_wewy_quiet) return NULL;
843
844 if (*find_sym != '*' && *found_sym)
845 return ret;
846 if (be_quiet)
847 return NULL;
848 else
849 return (char *)" - ";
850 }
851 /* scan an elf file and show all the fun stuff */
852 #define prints(str) write(fileno(stdout), str, strlen(str))
853 static int scanelf_elf(const char *filename)
854 {
855 unsigned long i;
856 char found_pax, found_phdr, found_relro, found_load, found_textrel,
857 found_rpath, found_needed, found_interp, found_bind, found_soname,
858 found_sym, found_lib, found_file, found_textrels;
859 elfobj *elf;
860 static char *out_buffer = NULL;
861 static size_t out_len;
862
863 found_pax = found_phdr = found_relro = found_load = found_textrel = \
864 found_rpath = found_needed = found_interp = found_bind = found_soname = \
865 found_sym = found_lib = found_file = found_textrels = 0;
866
867 /* verify this is real ELF */
868 if ((elf = _readelf(filename, !fix_elf)) == NULL) {
869 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
870 return 1;
871 }
872
873 if (be_verbose > 1)
874 printf("%s: scanning file {%s,%s}\n", filename,
875 get_elfeitype(EI_CLASS, elf->elf_class),
876 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
877 else if (be_verbose)
878 printf("%s: scanning file\n", filename);
879
880 /* init output buffer */
881 if (!out_buffer) {
882 out_len = sizeof(char) * 80;
883 out_buffer = (char*)xmalloc(out_len);
884 }
885 *out_buffer = '\0';
886
887 /* show the header */
888 if (!be_quiet && show_banner) {
889 for (i = 0; out_format[i]; ++i) {
890 if (!IS_MODIFIER(out_format[i])) continue;
891
892 switch (out_format[++i]) {
893 case '%': break;
894 case '#': break;
895 case 'F':
896 case 'p':
897 case 'f': prints("FILE "); found_file = 1; break;
898 case 'o': prints(" TYPE "); break;
899 case 'x': prints(" PAX "); break;
900 case 'e': prints("STK/REL/PTL "); break;
901 case 't': prints("TEXTREL "); break;
902 case 'r': prints("RPATH "); break;
903 case 'n': prints("NEEDED "); break;
904 case 'i': prints("INTERP "); break;
905 case 'b': prints("BIND "); break;
906 case 'S': prints("SONAME "); break;
907 case 's': prints("SYM "); break;
908 case 'N': prints("LIB "); break;
909 case 'T': prints("TEXTRELS "); break;
910 default: warnf("'%c' has no title ?", out_format[i]);
911 }
912 }
913 if (!found_file) prints("FILE ");
914 prints("\n");
915 found_file = 0;
916 show_banner = 0;
917 }
918
919 /* dump all the good stuff */
920 for (i = 0; out_format[i]; ++i) {
921 const char *out;
922 const char *tmp;
923
924 /* make sure we trim leading spaces in quiet mode */
925 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
926 *out_buffer = '\0';
927
928 if (!IS_MODIFIER(out_format[i])) {
929 xchrcat(&out_buffer, out_format[i], &out_len);
930 continue;
931 }
932
933 out = NULL;
934 be_wewy_wewy_quiet = (out_format[i] == '#');
935 switch (out_format[++i]) {
936 case '%':
937 case '#':
938 xchrcat(&out_buffer, out_format[i], &out_len); break;
939 case 'F':
940 found_file = 1;
941 if (be_wewy_wewy_quiet) break;
942 xstrcat(&out_buffer, filename, &out_len);
943 break;
944 case 'p':
945 found_file = 1;
946 if (be_wewy_wewy_quiet) break;
947 tmp = filename;
948 if (search_path) {
949 ssize_t len_search = strlen(search_path);
950 ssize_t len_file = strlen(filename);
951 if (!strncmp(filename, search_path, len_search) && \
952 len_file > len_search)
953 tmp += len_search;
954 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
955 }
956 xstrcat(&out_buffer, tmp, &out_len);
957 break;
958 case 'f':
959 found_file = 1;
960 if (be_wewy_wewy_quiet) break;
961 tmp = strrchr(filename, '/');
962 tmp = (tmp == NULL ? filename : tmp+1);
963 xstrcat(&out_buffer, tmp, &out_len);
964 break;
965 case 'o': out = get_elfetype(elf); break;
966 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
967 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
968 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
969 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
970 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
971 case 'n':
972 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
973 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
974 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
975 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
976 case 's': out = scanelf_file_sym(elf, &found_sym); break;
977 default: warnf("'%c' has no scan code?", out_format[i]);
978 }
979 if (out) {
980 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
981 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
982 xstrncat(&out_buffer, out, &out_len, (tmp-out));
983 else
984 xstrcat(&out_buffer, out, &out_len);
985 }
986 }
987
988 #define FOUND_SOMETHING() \
989 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
990 found_rpath || found_needed || found_interp || found_bind || \
991 found_soname || found_sym || found_lib || found_textrels)
992
993 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
994 xchrcat(&out_buffer, ' ', &out_len);
995 xstrcat(&out_buffer, filename, &out_len);
996 }
997 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
998 puts(out_buffer);
999 fflush(stdout);
1000 }
1001
1002 unreadelf(elf);
1003
1004 return 0;
1005 }
1006
1007 /* scan an archive of elfs */
1008 static int scanelf_archive(const char *filename)
1009 {
1010 archive_handle *ar = ar_open(filename);
1011 archive_member *m;
1012 while ((m=ar_next(ar)) != NULL)
1013 printf("%o %i:%i %s\n", m->mode, m->uid, m->gid, m->name);
1014 return 0;
1015 }
1016
1017 /* scan a file which may be an elf or an archive or some other magical beast */
1018 static void scanelf_file(const char *filename)
1019 {
1020 struct stat st;
1021
1022 /* make sure 'filename' exists */
1023 if (lstat(filename, &st) == -1) {
1024 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1025 return;
1026 }
1027
1028 /* always handle regular files and handle symlinked files if no -y */
1029 if (S_ISLNK(st.st_mode)) {
1030 if (!scan_symlink) return;
1031 stat(filename, &st);
1032 }
1033 if (!S_ISREG(st.st_mode)) {
1034 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1035 return;
1036 }
1037
1038 if (scanelf_elf(filename) == 1 && scan_archives)
1039 /* if it isn't an ELF, maybe it's an .a archive */
1040 scanelf_archive(filename);
1041 }
1042
1043 /* scan a directory for ET_EXEC files and print when we find one */
1044 static void scanelf_dir(const char *path)
1045 {
1046 register DIR *dir;
1047 register struct dirent *dentry;
1048 struct stat st_top, st;
1049 char buf[__PAX_UTILS_PATH_MAX];
1050 size_t pathlen = 0, len = 0;
1051
1052 /* make sure path exists */
1053 if (lstat(path, &st_top) == -1) {
1054 if (be_verbose > 2) printf("%s: does not exist\n", path);
1055 return;
1056 }
1057
1058 /* ok, if it isn't a directory, assume we can open it */
1059 if (!S_ISDIR(st_top.st_mode)) {
1060 scanelf_file(path);
1061 return;
1062 }
1063
1064 /* now scan the dir looking for fun stuff */
1065 if ((dir = opendir(path)) == NULL) {
1066 warnf("could not opendir %s: %s", path, strerror(errno));
1067 return;
1068 }
1069 if (be_verbose) printf("%s: scanning dir\n", path);
1070
1071 pathlen = strlen(path);
1072 while ((dentry = readdir(dir))) {
1073 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1074 continue;
1075 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1076 if (len >= sizeof(buf)) {
1077 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1078 (unsigned long)len, (unsigned long)sizeof(buf));
1079 continue;
1080 }
1081 sprintf(buf, "%s/%s", path, dentry->d_name);
1082 if (lstat(buf, &st) != -1) {
1083 if (S_ISREG(st.st_mode))
1084 scanelf_file(buf);
1085 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1086 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1087 scanelf_dir(buf);
1088 }
1089 }
1090 }
1091 closedir(dir);
1092 }
1093
1094 static int scanelf_from_file(char *filename)
1095 {
1096 FILE *fp = NULL;
1097 char *p;
1098 char path[__PAX_UTILS_PATH_MAX];
1099
1100 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1101 fp = stdin;
1102 else if ((fp = fopen(filename, "r")) == NULL)
1103 return 1;
1104
1105 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1106 if ((p = strchr(path, '\n')) != NULL)
1107 *p = 0;
1108 search_path = path;
1109 scanelf_dir(path);
1110 }
1111 if (fp != stdin)
1112 fclose(fp);
1113 return 0;
1114 }
1115
1116 static void load_ld_so_conf()
1117 {
1118 FILE *fp = NULL;
1119 char *p;
1120 char path[__PAX_UTILS_PATH_MAX];
1121 int i = 0;
1122
1123 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1124 return;
1125
1126 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1127 if (*path != '/')
1128 continue;
1129
1130 if ((p = strrchr(path, '\r')) != NULL)
1131 *p = 0;
1132 if ((p = strchr(path, '\n')) != NULL)
1133 *p = 0;
1134
1135 ldpaths[i++] = xstrdup(path);
1136
1137 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1138 break;
1139 }
1140 ldpaths[i] = NULL;
1141
1142 fclose(fp);
1143 }
1144
1145 /* scan /etc/ld.so.conf for paths */
1146 static void scanelf_ldpath()
1147 {
1148 char scan_l, scan_ul, scan_ull;
1149 int i = 0;
1150
1151 if (!ldpaths[0])
1152 err("Unable to load any paths from ld.so.conf");
1153
1154 scan_l = scan_ul = scan_ull = 0;
1155
1156 while (ldpaths[i]) {
1157 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1158 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1159 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1160 scanelf_dir(ldpaths[i]);
1161 ++i;
1162 }
1163
1164 if (!scan_l) scanelf_dir("/lib");
1165 if (!scan_ul) scanelf_dir("/usr/lib");
1166 if (!scan_ull) scanelf_dir("/usr/local/lib");
1167 }
1168
1169 /* scan env PATH for paths */
1170 static void scanelf_envpath()
1171 {
1172 char *path, *p;
1173
1174 path = getenv("PATH");
1175 if (!path)
1176 err("PATH is not set in your env !");
1177 path = xstrdup(path);
1178
1179 while ((p = strrchr(path, ':')) != NULL) {
1180 scanelf_dir(p + 1);
1181 *p = 0;
1182 }
1183
1184 free(path);
1185 }
1186
1187
1188 /* usage / invocation handling functions */
1189 #define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:BhV"
1190 #define a_argument required_argument
1191 static struct option const long_opts[] = {
1192 {"path", no_argument, NULL, 'p'},
1193 {"ldpath", no_argument, NULL, 'l'},
1194 {"recursive", no_argument, NULL, 'R'},
1195 {"mount", no_argument, NULL, 'm'},
1196 {"symlink", no_argument, NULL, 'y'},
1197 {"archives", no_argument, NULL, 'A'},
1198 {"ldcache", no_argument, NULL, 'L'},
1199 {"fix", no_argument, NULL, 'X'},
1200 {"pax", no_argument, NULL, 'x'},
1201 {"header", no_argument, NULL, 'e'},
1202 {"textrel", no_argument, NULL, 't'},
1203 {"rpath", no_argument, NULL, 'r'},
1204 {"needed", no_argument, NULL, 'n'},
1205 {"interp", no_argument, NULL, 'i'},
1206 {"bind", no_argument, NULL, 'b'},
1207 {"soname", no_argument, NULL, 'S'},
1208 {"symbol", a_argument, NULL, 's'},
1209 {"lib", a_argument, NULL, 'N'},
1210 {"gmatch", no_argument, NULL, 'g'},
1211 {"textrels", no_argument, NULL, 'T'},
1212 {"all", no_argument, NULL, 'a'},
1213 {"quiet", no_argument, NULL, 'q'},
1214 {"verbose", no_argument, NULL, 'v'},
1215 {"format", a_argument, NULL, 'F'},
1216 {"from", a_argument, NULL, 'f'},
1217 {"file", a_argument, NULL, 'o'},
1218 {"nobanner", no_argument, NULL, 'B'},
1219 {"help", no_argument, NULL, 'h'},
1220 {"version", no_argument, NULL, 'V'},
1221 {NULL, no_argument, NULL, 0x0}
1222 };
1223
1224 static const char *opts_help[] = {
1225 "Scan all directories in PATH environment",
1226 "Scan all directories in /etc/ld.so.conf",
1227 "Scan directories recursively",
1228 "Don't recursively cross mount points",
1229 "Don't scan symlinks",
1230 "Scan archives (.a files)",
1231 "Utilize ld.so.cache information (use with -r/-n)",
1232 "Try and 'fix' bad things (use with -r/-e)\n",
1233 "Print PaX markings",
1234 "Print GNU_STACK/PT_LOAD markings",
1235 "Print TEXTREL information",
1236 "Print RPATH information",
1237 "Print NEEDED information",
1238 "Print INTERP information",
1239 "Print BIND information",
1240 "Print SONAME information",
1241 "Find a specified symbol",
1242 "Find a specified library",
1243 "Use strncmp to match libraries. (use with -N)",
1244 "Locate cause of TEXTREL",
1245 "Print all scanned info (-x -e -t -r -b)\n",
1246 "Only output 'bad' things",
1247 "Be verbose (can be specified more than once)",
1248 "Use specified format for output",
1249 "Read input stream from a filename",
1250 "Write output stream to a filename",
1251 "Don't display the header",
1252 "Print this help and exit",
1253 "Print version and exit",
1254 NULL
1255 };
1256
1257 /* display usage and exit */
1258 static void usage(int status)
1259 {
1260 unsigned long i;
1261 printf("* Scan ELF binaries for stuff\n\n"
1262 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1263 printf("Options: -[%s]\n", PARSE_FLAGS);
1264 for (i = 0; long_opts[i].name; ++i)
1265 if (long_opts[i].has_arg == no_argument)
1266 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1267 long_opts[i].name, opts_help[i]);
1268 else
1269 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1270 long_opts[i].name, opts_help[i]);
1271
1272 if (status != EXIT_SUCCESS)
1273 exit(status);
1274
1275 puts("\nThe format modifiers for the -F option are:");
1276 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1277 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1278 puts(" i INTERP \tb BIND \ts symbol");
1279 puts(" N library \to Type \tT TEXTRELs");
1280 puts(" S SONAME");
1281 puts(" p filename (with search path removed)");
1282 puts(" f filename (short name/basename)");
1283 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1284
1285 exit(status);
1286 }
1287
1288 /* parse command line arguments and preform needed actions */
1289 static void parseargs(int argc, char *argv[])
1290 {
1291 int i;
1292 char *from_file = NULL;
1293
1294 opterr = 0;
1295 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1296 switch (i) {
1297
1298 case 'V':
1299 printf("pax-utils-%s: %s compiled %s\n%s\n"
1300 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1301 VERSION, __FILE__, __DATE__, rcsid, argv0);
1302 exit(EXIT_SUCCESS);
1303 break;
1304 case 'h': usage(EXIT_SUCCESS); break;
1305 case 'f':
1306 if (from_file) warn("You prob don't want to specify -f twice");
1307 from_file = optarg;
1308 break;
1309 case 'o': {
1310 FILE *fp = NULL;
1311 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1312 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1313 SET_STDOUT(fp);
1314 break;
1315 }
1316
1317 case 's': {
1318 if (find_sym) warn("You prob don't want to specify -s twice");
1319 find_sym = optarg;
1320 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1321 sprintf(versioned_symname, "%s@", find_sym);
1322 break;
1323 }
1324 case 'N': {
1325 if (find_lib) warn("You prob don't want to specify -N twice");
1326 find_lib = optarg;
1327 break;
1328 }
1329
1330 case 'F': {
1331 if (out_format) warn("You prob don't want to specify -F twice");
1332 out_format = optarg;
1333 break;
1334 }
1335
1336 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1337 case 'L': use_ldcache = 1; break;
1338 case 'y': scan_symlink = 0; break;
1339 case 'A': scan_archives = 1; break;
1340 case 'B': show_banner = 0; break;
1341 case 'l': scan_ldpath = 1; break;
1342 case 'p': scan_envpath = 1; break;
1343 case 'R': dir_recurse = 1; break;
1344 case 'm': dir_crossmount = 0; break;
1345 case 'X': ++fix_elf; break;
1346 case 'x': show_pax = 1; break;
1347 case 'e': show_phdr = 1; break;
1348 case 't': show_textrel = 1; break;
1349 case 'r': show_rpath = 1; break;
1350 case 'n': show_needed = 1; break;
1351 case 'i': show_interp = 1; break;
1352 case 'b': show_bind = 1; break;
1353 case 'S': show_soname = 1; break;
1354 case 'T': show_textrels = 1; break;
1355 case 'q': be_quiet = 1; break;
1356 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1357 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1358
1359 case ':':
1360 err("Option missing parameter\n");
1361 case '?':
1362 err("Unknown option\n");
1363 default:
1364 err("Unhandled option '%c'", i);
1365 }
1366 }
1367
1368 /* let the format option override all other options */
1369 if (out_format) {
1370 show_pax = show_phdr = show_textrel = show_rpath = \
1371 show_needed = show_interp = show_bind = show_soname = \
1372 show_textrels = 0;
1373 for (i = 0; out_format[i]; ++i) {
1374 if (!IS_MODIFIER(out_format[i])) continue;
1375
1376 switch (out_format[++i]) {
1377 case '%': break;
1378 case '#': break;
1379 case 'F': break;
1380 case 'p': break;
1381 case 'f': break;
1382 case 's': break;
1383 case 'N': break;
1384 case 'o': break;
1385 case 'x': show_pax = 1; break;
1386 case 'e': show_phdr = 1; break;
1387 case 't': show_textrel = 1; break;
1388 case 'r': show_rpath = 1; break;
1389 case 'n': show_needed = 1; break;
1390 case 'i': show_interp = 1; break;
1391 case 'b': show_bind = 1; break;
1392 case 'S': show_soname = 1; break;
1393 case 'T': show_textrels = 1; break;
1394 default:
1395 err("Invalid format specifier '%c' (byte %i)",
1396 out_format[i], i+1);
1397 }
1398 }
1399
1400 /* construct our default format */
1401 } else {
1402 size_t fmt_len = 30;
1403 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1404 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1405 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1406 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1407 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1408 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1409 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1410 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1411 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1412 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1413 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1414 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1415 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1416 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1417 }
1418 if (be_verbose > 2) printf("Format: %s\n", out_format);
1419
1420 /* now lets actually do the scanning */
1421 if (scan_ldpath || use_ldcache)
1422 load_ld_so_conf();
1423 if (scan_ldpath) scanelf_ldpath();
1424 if (scan_envpath) scanelf_envpath();
1425 if (from_file) {
1426 scanelf_from_file(from_file);
1427 from_file = *argv;
1428 }
1429 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1430 err("Nothing to scan !?");
1431 while (optind < argc) {
1432 search_path = argv[optind++];
1433 scanelf_dir(search_path);
1434 }
1435
1436 /* clean up */
1437 if (versioned_symname) free(versioned_symname);
1438 for (i = 0; ldpaths[i]; ++i)
1439 free(ldpaths[i]);
1440
1441 if (ldcache != 0)
1442 munmap(ldcache, ldcache_size);
1443 }
1444
1445
1446
1447 /* utility funcs */
1448 static char *xstrdup(const char *s)
1449 {
1450 char *ret = strdup(s);
1451 if (!ret) err("Could not strdup(): %s", strerror(errno));
1452 return ret;
1453 }
1454 static void *xmalloc(size_t size)
1455 {
1456 void *ret = malloc(size);
1457 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1458 return ret;
1459 }
1460 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1461 {
1462 size_t new_len;
1463
1464 new_len = strlen(*dst) + strlen(src);
1465 if (*curr_len <= new_len) {
1466 *curr_len = new_len + (*curr_len / 2);
1467 *dst = realloc(*dst, *curr_len);
1468 if (!*dst)
1469 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1470 }
1471
1472 if (n)
1473 strncat(*dst, src, n);
1474 else
1475 strcat(*dst, src);
1476 }
1477 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1478 {
1479 static char my_app[2];
1480 my_app[0] = append;
1481 my_app[1] = '\0';
1482 xstrcat(dst, my_app, curr_len);
1483 }
1484
1485
1486
1487 int main(int argc, char *argv[])
1488 {
1489 if (argc < 2)
1490 usage(EXIT_FAILURE);
1491 parseargs(argc, argv);
1492 fclose(stdout);
1493 #ifdef __BOUNDS_CHECKING_ON
1494 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1495 #endif
1496 return EXIT_SUCCESS;
1497 }

  ViewVC Help
Powered by ViewVC 1.1.20