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Revision 1.102 - (show annotations) (download) (as text)
Wed Jan 11 01:12:12 2006 UTC (8 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.101: +31 -23 lines
File MIME type: text/x-csrc
improve rpath output thanks to Ludwig Nussel and touchup the rpath fixing code to handle some corner cases

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 1.101 2006/01/10 01:40:15 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 1.101 2006/01/10 01:40:15 vapier Exp $";
13 #define argv0 "scanelf"
14
15 #define IS_MODIFIER(c) (c == '%' || c == '#')
16
17
18
19 /* prototypes */
20 static void scanelf_file(const char *filename);
21 static void scanelf_dir(const char *path);
22 static void scanelf_ldpath();
23 static void scanelf_envpath();
24 static void usage(int status);
25 static void parseargs(int argc, char *argv[]);
26 static char *xstrdup(const char *s);
27 static void *xmalloc(size_t size);
28 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
29 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
30 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
31
32 /* variables to control behavior */
33 static char *ldpaths[256];
34 static char scan_ldpath = 0;
35 static char scan_envpath = 0;
36 static char scan_symlink = 1;
37 static char dir_recurse = 0;
38 static char dir_crossmount = 1;
39 static char show_pax = 0;
40 static char show_phdr = 0;
41 static char show_textrel = 0;
42 static char show_rpath = 0;
43 static char show_needed = 0;
44 static char show_interp = 0;
45 static char show_bind = 0;
46 static char show_soname = 0;
47 static char show_textrels = 0;
48 static char show_banner = 1;
49 static char be_quiet = 0;
50 static char be_verbose = 0;
51 static char be_wewy_wewy_quiet = 0;
52 static char *find_sym = NULL, *versioned_symname = NULL;
53 static char *find_lib = NULL;
54 static char *out_format = NULL;
55 static char *search_path = NULL;
56 static char fix_elf = 0;
57 static char gmatch = 0;
58 static char use_ldcache = 0;
59
60
61 caddr_t ldcache = 0;
62 size_t ldcache_size = 0;
63
64 /* sub-funcs for scanelf_file() */
65 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
66 {
67 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
68 #define GET_SYMTABS(B) \
69 if (elf->elf_class == ELFCLASS ## B) { \
70 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
71 /* debug sections */ \
72 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
73 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
74 /* runtime sections */ \
75 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
76 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
77 if (symtab && dynsym) { \
78 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
79 } else { \
80 *sym = (void*)(symtab ? symtab : dynsym); \
81 } \
82 if (strtab && dynstr) { \
83 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
84 } else { \
85 *tab = (void*)(strtab ? strtab : dynstr); \
86 } \
87 }
88 GET_SYMTABS(32)
89 GET_SYMTABS(64)
90 }
91 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
92 {
93 static char ret[7];
94 unsigned long i, shown;
95
96 if (!show_pax) return NULL;
97
98 shown = 0;
99 memset(&ret, 0, sizeof(ret));
100
101 if (elf->phdr) {
102 #define SHOW_PAX(B) \
103 if (elf->elf_class == ELFCLASS ## B) { \
104 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
105 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
106 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
107 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
108 continue; \
109 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
110 continue; \
111 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
112 *found_pax = 1; \
113 ++shown; \
114 break; \
115 } \
116 }
117 SHOW_PAX(32)
118 SHOW_PAX(64)
119 }
120
121 /* fall back to EI_PAX if no PT_PAX was found */
122 if (!*ret) {
123 static char *paxflags;
124 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
125 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
126 *found_pax = 1;
127 return (be_wewy_wewy_quiet ? NULL : paxflags);
128 }
129 strncpy(ret, paxflags, sizeof(ret));
130 }
131
132 if (be_wewy_wewy_quiet || (be_quiet && !shown))
133 return NULL;
134 else
135 return ret;
136 }
137
138 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
139 {
140 static char ret[12];
141 char *found;
142 unsigned long i, shown, multi_stack, multi_relro, multi_load;
143 int max_pt_load;
144
145 if (!show_phdr) return NULL;
146
147 memcpy(ret, "--- --- ---\0", 12);
148
149 shown = 0;
150 multi_stack = multi_relro = multi_load = 0;
151 max_pt_load = elf_max_pt_load(elf);
152
153 #define SHOW_PHDR(B) \
154 if (elf->elf_class == ELFCLASS ## B) { \
155 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
156 Elf ## B ## _Off offset; \
157 uint32_t flags, check_flags; \
158 if (elf->phdr != NULL) { \
159 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
160 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
161 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
162 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
163 found = found_phdr; \
164 offset = 0; \
165 check_flags = PF_X; \
166 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
167 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
168 found = found_relro; \
169 offset = 4; \
170 check_flags = PF_X; \
171 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
172 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
173 found = found_load; \
174 offset = 8; \
175 check_flags = PF_W|PF_X; \
176 } else \
177 continue; \
178 flags = EGET(phdr[i].p_flags); \
179 if (be_quiet && ((flags & check_flags) != check_flags)) \
180 continue; \
181 if (fix_elf && ((flags & PF_X) != flags)) { \
182 ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
183 ret[3] = ret[7] = '!'; \
184 flags = EGET(phdr[i].p_flags); \
185 } \
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 *, const char *);
367 static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
368 {
369 struct stat st;
370 switch (*item) {
371 case '/': break;
372 case '.':
373 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
374 break;
375 case ':':
376 case '\0':
377 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
378 break;
379 case '$':
380 if (fstat(elf->fd, &st) != -1)
381 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
382 warnf("Security problem with %s='%s' in %s with mode set of %o",
383 dt_type, item, elf->filename, st.st_mode & 07777);
384 break;
385 default:
386 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
387 break;
388 }
389 }
390 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
391 {
392 unsigned long i, s;
393 char *rpath, *runpath, **r;
394 void *strtbl_void;
395
396 if (!show_rpath) return;
397
398 strtbl_void = elf_findsecbyname(elf, ".dynstr");
399 rpath = runpath = NULL;
400
401 if (elf->phdr && strtbl_void) {
402 #define SHOW_RPATH(B) \
403 if (elf->elf_class == ELFCLASS ## B) { \
404 Elf ## B ## _Dyn *dyn; \
405 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
406 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
407 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
408 Elf ## B ## _Off offset; \
409 Elf ## B ## _Xword word; \
410 /* Scan all the program headers */ \
411 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
412 /* Just scan dynamic headers */ \
413 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
414 offset = EGET(phdr[i].p_offset); \
415 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
416 /* Just scan dynamic RPATH/RUNPATH headers */ \
417 dyn = DYN ## B (elf->data + offset); \
418 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
419 if (word == DT_RPATH) { \
420 r = &rpath; \
421 } else if (word == DT_RUNPATH) { \
422 r = &runpath; \
423 } else { \
424 ++dyn; \
425 continue; \
426 } \
427 /* Verify the memory is somewhat sane */ \
428 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
429 if (offset < (Elf ## B ## _Off)elf->len) { \
430 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
431 *r = (char*)(elf->data + offset); \
432 /* If quiet, don't output paths in ld.so.conf */ \
433 if (be_quiet) { \
434 size_t len; \
435 char *start, *end; \
436 /* note that we only 'chop' off leading known paths. */ \
437 /* since *r is read-only memory, we can only move the ptr forward. */ \
438 start = *r; \
439 /* scan each path in : delimited list */ \
440 while (start) { \
441 rpath_security_checks(elf, start, get_elfdtype(word)); \
442 end = strchr(start, ':'); \
443 len = (end ? abs(end - start) : strlen(start)); \
444 if (use_ldcache) \
445 for (s = 0; ldpaths[s]; ++s) \
446 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
447 *r = end; \
448 /* corner case ... if RPATH reads "/usr/lib:", we want \
449 * to show ':' rather than '' */ \
450 if (end && end[1] != '\0') \
451 (*r)++; \
452 break; \
453 } \
454 if (!*r || !end) \
455 break; \
456 else \
457 start = start + len + 1; \
458 } \
459 } \
460 if (*r) { \
461 if (fix_elf > 2 || **r == '\0') { \
462 /* just nuke it */ \
463 nuke_it##B: \
464 *r = NULL; \
465 ESET(dyn->d_tag, DT_DEBUG); \
466 } else if (fix_elf) { \
467 /* try to clean "bad" paths */ \
468 size_t len, tmpdir_len; \
469 char *start, *end; \
470 const char *tmpdir; \
471 start = *r; \
472 tmpdir = (getenv("TMPDIR") ? : "."); \
473 tmpdir_len = strlen(tmpdir); \
474 while (1) { \
475 end = strchr(start, ':'); \
476 if (start == end) { \
477 eat_this_path##B: \
478 len = strlen(end); \
479 memmove(start, end+1, len); \
480 start[len-1] = '\0'; \
481 end = start - 1; \
482 } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
483 if (!end) { \
484 if (start == *r) \
485 goto nuke_it##B; \
486 *--start = '\0'; \
487 } else \
488 goto eat_this_path##B; \
489 } \
490 if (!end) \
491 break; \
492 start = end + 1; \
493 } \
494 if (**r == '\0') \
495 goto nuke_it##B; \
496 } \
497 if (*r) \
498 *found_rpath = 1; \
499 } \
500 } \
501 ++dyn; \
502 } \
503 } }
504 SHOW_RPATH(32)
505 SHOW_RPATH(64)
506 }
507
508 if (be_wewy_wewy_quiet) return;
509
510 if (rpath && runpath) {
511 if (!strcmp(rpath, runpath)) {
512 xstrcat(ret, runpath, ret_len);
513 } else {
514 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
515 xchrcat(ret, '{', ret_len);
516 xstrcat(ret, rpath, ret_len);
517 xchrcat(ret, ',', ret_len);
518 xstrcat(ret, runpath, ret_len);
519 xchrcat(ret, '}', ret_len);
520 }
521 } else if (rpath || runpath)
522 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
523 else if (!be_quiet)
524 xstrcat(ret, " - ", ret_len);
525 }
526
527 #define LDSO_CACHE_MAGIC "ld.so-"
528 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
529 #define LDSO_CACHE_VER "1.7.0"
530 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
531 #define FLAG_ANY -1
532 #define FLAG_TYPE_MASK 0x00ff
533 #define FLAG_LIBC4 0x0000
534 #define FLAG_ELF 0x0001
535 #define FLAG_ELF_LIBC5 0x0002
536 #define FLAG_ELF_LIBC6 0x0003
537 #define FLAG_REQUIRED_MASK 0xff00
538 #define FLAG_SPARC_LIB64 0x0100
539 #define FLAG_IA64_LIB64 0x0200
540 #define FLAG_X8664_LIB64 0x0300
541 #define FLAG_S390_LIB64 0x0400
542 #define FLAG_POWERPC_LIB64 0x0500
543 #define FLAG_MIPS64_LIBN32 0x0600
544 #define FLAG_MIPS64_LIBN64 0x0700
545
546 static char *lookup_cache_lib(elfobj *, char *);
547 static char *lookup_cache_lib(elfobj *elf, char *fname)
548 {
549 int fd = 0;
550 char *strs;
551 static char buf[_POSIX_PATH_MAX] = "";
552 const char *cachefile = "/etc/ld.so.cache";
553 struct stat st;
554
555 typedef struct {
556 char magic[LDSO_CACHE_MAGIC_LEN];
557 char version[LDSO_CACHE_VER_LEN];
558 int nlibs;
559 } header_t;
560 header_t *header;
561
562 typedef struct {
563 int flags;
564 int sooffset;
565 int liboffset;
566 } libentry_t;
567 libentry_t *libent;
568
569 if (fname == NULL)
570 return NULL;
571
572 if (ldcache == 0) {
573 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
574 return NULL;
575
576 /* cache these values so we only map/unmap the cache file once */
577 ldcache_size = st.st_size;
578 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
579
580 close(fd);
581
582 if (ldcache == (caddr_t)-1)
583 return NULL;
584
585 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
586 return NULL;
587 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
588 return NULL;
589 }
590
591 header = (header_t *) ldcache;
592 libent = (libentry_t *) (ldcache + sizeof(header_t));
593 strs = (char *) &libent[header->nlibs];
594
595 for (fd = 0; fd < header->nlibs; fd++) {
596 /* this should be more fine grained, but for now we assume that
597 * diff arches will not be cached together. and we ignore the
598 * the different multilib mips cases. */
599 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
600 continue;
601 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
602 continue;
603
604 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
605 continue;
606 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
607 }
608 return buf;
609 }
610
611
612 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
613 {
614 unsigned long i;
615 char *needed;
616 void *strtbl_void;
617 char *p;
618
619 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
620
621 strtbl_void = elf_findsecbyname(elf, ".dynstr");
622
623 if (elf->phdr && strtbl_void) {
624 #define SHOW_NEEDED(B) \
625 if (elf->elf_class == ELFCLASS ## B) { \
626 Elf ## B ## _Dyn *dyn; \
627 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
628 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
629 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
630 Elf ## B ## _Off offset; \
631 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
632 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
633 offset = EGET(phdr[i].p_offset); \
634 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
635 dyn = DYN ## B (elf->data + offset); \
636 while (EGET(dyn->d_tag) != DT_NULL) { \
637 if (EGET(dyn->d_tag) == DT_NEEDED) { \
638 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
639 if (offset >= (Elf ## B ## _Off)elf->len) { \
640 ++dyn; \
641 continue; \
642 } \
643 needed = (char*)(elf->data + offset); \
644 if (op == 0) { \
645 if (!be_wewy_wewy_quiet) { \
646 if (*found_needed) xchrcat(ret, ',', ret_len); \
647 if (use_ldcache) \
648 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
649 needed = p; \
650 xstrcat(ret, needed, ret_len); \
651 } \
652 *found_needed = 1; \
653 } else { \
654 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
655 *found_lib = 1; \
656 return (be_wewy_wewy_quiet ? NULL : needed); \
657 } \
658 } \
659 } \
660 ++dyn; \
661 } \
662 } }
663 SHOW_NEEDED(32)
664 SHOW_NEEDED(64)
665 if (op == 0 && !*found_needed && be_verbose)
666 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
667 }
668
669 return NULL;
670 }
671 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
672 {
673 void *strtbl_void;
674
675 if (!show_interp) return NULL;
676
677 strtbl_void = elf_findsecbyname(elf, ".interp");
678
679 if (strtbl_void) {
680 #define SHOW_INTERP(B) \
681 if (elf->elf_class == ELFCLASS ## B) { \
682 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
683 *found_interp = 1; \
684 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
685 }
686 SHOW_INTERP(32)
687 SHOW_INTERP(64)
688 }
689 return NULL;
690 }
691 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
692 {
693 unsigned long i;
694 struct stat s;
695
696 if (!show_bind) return NULL;
697 if (!elf->phdr) return NULL;
698
699 #define SHOW_BIND(B) \
700 if (elf->elf_class == ELFCLASS ## B) { \
701 Elf ## B ## _Dyn *dyn; \
702 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
703 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
704 Elf ## B ## _Off offset; \
705 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
706 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
707 offset = EGET(phdr[i].p_offset); \
708 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
709 dyn = DYN ## B (elf->data + offset); \
710 while (EGET(dyn->d_tag) != DT_NULL) { \
711 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
712 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
713 { \
714 if (be_quiet) return NULL; \
715 *found_bind = 1; \
716 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
717 } \
718 ++dyn; \
719 } \
720 } \
721 }
722 SHOW_BIND(32)
723 SHOW_BIND(64)
724
725 if (be_wewy_wewy_quiet) return NULL;
726
727 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
728 return NULL;
729 } else {
730 *found_bind = 1;
731 return (char *) "LAZY";
732 }
733 }
734 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
735 {
736 unsigned long i;
737 char *soname;
738 void *strtbl_void;
739
740 if (!show_soname) return NULL;
741
742 strtbl_void = elf_findsecbyname(elf, ".dynstr");
743
744 if (elf->phdr && strtbl_void) {
745 #define SHOW_SONAME(B) \
746 if (elf->elf_class == ELFCLASS ## B) { \
747 Elf ## B ## _Dyn *dyn; \
748 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
749 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
750 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
751 Elf ## B ## _Off offset; \
752 /* only look for soname in shared objects */ \
753 if (ehdr->e_type != ET_DYN) \
754 return NULL; \
755 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
756 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
757 offset = EGET(phdr[i].p_offset); \
758 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
759 dyn = DYN ## B (elf->data + offset); \
760 while (EGET(dyn->d_tag) != DT_NULL) { \
761 if (EGET(dyn->d_tag) == DT_SONAME) { \
762 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
763 if (offset >= (Elf ## B ## _Off)elf->len) { \
764 ++dyn; \
765 continue; \
766 } \
767 soname = (char*)(elf->data + offset); \
768 *found_soname = 1; \
769 return (be_wewy_wewy_quiet ? NULL : soname); \
770 } \
771 ++dyn; \
772 } \
773 } }
774 SHOW_SONAME(32)
775 SHOW_SONAME(64)
776 }
777
778 return NULL;
779 }
780 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
781 {
782 unsigned long i;
783 char *ret;
784 void *symtab_void, *strtab_void;
785
786 if (!find_sym) return NULL;
787 ret = find_sym;
788
789 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
790
791 if (symtab_void && strtab_void) {
792 #define FIND_SYM(B) \
793 if (elf->elf_class == ELFCLASS ## B) { \
794 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
795 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
796 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
797 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
798 char *symname; \
799 for (i = 0; i < cnt; ++i) { \
800 if (sym->st_name) { \
801 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
802 if (*find_sym == '*') { \
803 printf("%s(%s) %5lX %15s %s\n", \
804 ((*found_sym == 0) ? "\n\t" : "\t"), \
805 elf->base_filename, \
806 (unsigned long)sym->st_size, \
807 get_elfstttype(sym->st_info), \
808 symname); \
809 *found_sym = 1; \
810 } else { \
811 char *this_sym, *next_sym; \
812 this_sym = find_sym; \
813 do { \
814 next_sym = strchr(this_sym, ','); \
815 if (next_sym == NULL) \
816 next_sym = this_sym + strlen(this_sym); \
817 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
818 (strcmp(symname, versioned_symname) == 0)) { \
819 ret = this_sym; \
820 (*found_sym)++; \
821 goto break_out; \
822 } \
823 this_sym = next_sym + 1; \
824 } while (*next_sym != '\0'); \
825 } \
826 } \
827 ++sym; \
828 } }
829 FIND_SYM(32)
830 FIND_SYM(64)
831 }
832
833 break_out:
834 if (be_wewy_wewy_quiet) return NULL;
835
836 if (*find_sym != '*' && *found_sym)
837 return ret;
838 if (be_quiet)
839 return NULL;
840 else
841 return (char *)" - ";
842 }
843 /* scan an elf file and show all the fun stuff */
844 #define prints(str) write(fileno(stdout), str, strlen(str))
845 static void scanelf_file(const char *filename)
846 {
847 unsigned long i;
848 char found_pax, found_phdr, found_relro, found_load, found_textrel,
849 found_rpath, found_needed, found_interp, found_bind, found_soname,
850 found_sym, found_lib, found_file, found_textrels;
851 elfobj *elf;
852 struct stat st;
853 static char *out_buffer = NULL;
854 static size_t out_len;
855
856 /* make sure 'filename' exists */
857 if (lstat(filename, &st) == -1) {
858 if (be_verbose > 2) printf("%s: does not exist\n", filename);
859 return;
860 }
861 /* always handle regular files and handle symlinked files if no -y */
862 if (S_ISLNK(st.st_mode)) {
863 if (!scan_symlink) return;
864 stat(filename, &st);
865 }
866 if (!S_ISREG(st.st_mode)) {
867 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
868 return;
869 }
870
871 found_pax = found_phdr = found_relro = found_load = found_textrel = \
872 found_rpath = found_needed = found_interp = found_bind = found_soname = \
873 found_sym = found_lib = found_file = found_textrels = 0;
874
875 /* verify this is real ELF */
876 if ((elf = _readelf(filename, !fix_elf)) == NULL) {
877 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
878 return;
879 }
880
881 if (be_verbose > 1)
882 printf("%s: scanning file {%s,%s}\n", filename,
883 get_elfeitype(EI_CLASS, elf->elf_class),
884 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
885 else if (be_verbose)
886 printf("%s: scanning file\n", filename);
887
888 /* init output buffer */
889 if (!out_buffer) {
890 out_len = sizeof(char) * 80;
891 out_buffer = (char*)xmalloc(out_len);
892 }
893 *out_buffer = '\0';
894
895 /* show the header */
896 if (!be_quiet && show_banner) {
897 for (i = 0; out_format[i]; ++i) {
898 if (!IS_MODIFIER(out_format[i])) continue;
899
900 switch (out_format[++i]) {
901 case '%': break;
902 case '#': break;
903 case 'F':
904 case 'p':
905 case 'f': prints("FILE "); found_file = 1; break;
906 case 'o': prints(" TYPE "); break;
907 case 'x': prints(" PAX "); break;
908 case 'e': prints("STK/REL/PTL "); break;
909 case 't': prints("TEXTREL "); break;
910 case 'r': prints("RPATH "); break;
911 case 'n': prints("NEEDED "); break;
912 case 'i': prints("INTERP "); break;
913 case 'b': prints("BIND "); break;
914 case 'S': prints("SONAME "); break;
915 case 's': prints("SYM "); break;
916 case 'N': prints("LIB "); break;
917 case 'T': prints("TEXTRELS "); break;
918 default: warnf("'%c' has no title ?", out_format[i]);
919 }
920 }
921 if (!found_file) prints("FILE ");
922 prints("\n");
923 found_file = 0;
924 show_banner = 0;
925 }
926
927 /* dump all the good stuff */
928 for (i = 0; out_format[i]; ++i) {
929 const char *out;
930 const char *tmp;
931
932 /* make sure we trim leading spaces in quiet mode */
933 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
934 *out_buffer = '\0';
935
936 if (!IS_MODIFIER(out_format[i])) {
937 xchrcat(&out_buffer, out_format[i], &out_len);
938 continue;
939 }
940
941 out = NULL;
942 be_wewy_wewy_quiet = (out_format[i] == '#');
943 switch (out_format[++i]) {
944 case '%':
945 case '#':
946 xchrcat(&out_buffer, out_format[i], &out_len); break;
947 case 'F':
948 found_file = 1;
949 if (be_wewy_wewy_quiet) break;
950 xstrcat(&out_buffer, filename, &out_len);
951 break;
952 case 'p':
953 found_file = 1;
954 if (be_wewy_wewy_quiet) break;
955 tmp = filename;
956 if (search_path) {
957 ssize_t len_search = strlen(search_path);
958 ssize_t len_file = strlen(filename);
959 if (!strncmp(filename, search_path, len_search) && \
960 len_file > len_search)
961 tmp += len_search;
962 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
963 }
964 xstrcat(&out_buffer, tmp, &out_len);
965 break;
966 case 'f':
967 found_file = 1;
968 if (be_wewy_wewy_quiet) break;
969 tmp = strrchr(filename, '/');
970 tmp = (tmp == NULL ? filename : tmp+1);
971 xstrcat(&out_buffer, tmp, &out_len);
972 break;
973 case 'o': out = get_elfetype(elf); break;
974 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
975 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
976 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
977 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
978 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
979 case 'n':
980 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
981 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
982 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
983 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
984 case 's': out = scanelf_file_sym(elf, &found_sym); break;
985 default: warnf("'%c' has no scan code?", out_format[i]);
986 }
987 if (out) {
988 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
989 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
990 xstrncat(&out_buffer, out, &out_len, (tmp-out));
991 else
992 xstrcat(&out_buffer, out, &out_len);
993 }
994 }
995
996 #define FOUND_SOMETHING() \
997 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
998 found_rpath || found_needed || found_interp || found_bind || \
999 found_soname || found_sym || found_lib || found_textrels)
1000
1001 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
1002 xchrcat(&out_buffer, ' ', &out_len);
1003 xstrcat(&out_buffer, filename, &out_len);
1004 }
1005 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1006 puts(out_buffer);
1007 fflush(stdout);
1008 }
1009
1010 unreadelf(elf);
1011 }
1012
1013 /* scan a directory for ET_EXEC files and print when we find one */
1014 static void scanelf_dir(const char *path)
1015 {
1016 register DIR *dir;
1017 register struct dirent *dentry;
1018 struct stat st_top, st;
1019 char buf[_POSIX_PATH_MAX];
1020 size_t pathlen = 0, len = 0;
1021
1022 /* make sure path exists */
1023 if (lstat(path, &st_top) == -1) {
1024 if (be_verbose > 2) printf("%s: does not exist\n", path);
1025 return;
1026 }
1027
1028 /* ok, if it isn't a directory, assume we can open it */
1029 if (!S_ISDIR(st_top.st_mode)) {
1030 scanelf_file(path);
1031 return;
1032 }
1033
1034 /* now scan the dir looking for fun stuff */
1035 if ((dir = opendir(path)) == NULL) {
1036 warnf("could not opendir %s: %s", path, strerror(errno));
1037 return;
1038 }
1039 if (be_verbose) printf("%s: scanning dir\n", path);
1040
1041 pathlen = strlen(path);
1042 while ((dentry = readdir(dir))) {
1043 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1044 continue;
1045 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1046 if (len >= sizeof(buf)) {
1047 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1048 (unsigned long)len, (unsigned long)sizeof(buf));
1049 continue;
1050 }
1051 sprintf(buf, "%s/%s", path, dentry->d_name);
1052 if (lstat(buf, &st) != -1) {
1053 if (S_ISREG(st.st_mode))
1054 scanelf_file(buf);
1055 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1056 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1057 scanelf_dir(buf);
1058 }
1059 }
1060 }
1061 closedir(dir);
1062 }
1063
1064 static int scanelf_from_file(char *filename)
1065 {
1066 FILE *fp = NULL;
1067 char *p;
1068 char path[_POSIX_PATH_MAX];
1069
1070 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1071 fp = stdin;
1072 else if ((fp = fopen(filename, "r")) == NULL)
1073 return 1;
1074
1075 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1076 if ((p = strchr(path, '\n')) != NULL)
1077 *p = 0;
1078 search_path = path;
1079 scanelf_dir(path);
1080 }
1081 if (fp != stdin)
1082 fclose(fp);
1083 return 0;
1084 }
1085
1086 static void load_ld_so_conf()
1087 {
1088 FILE *fp = NULL;
1089 char *p;
1090 char path[_POSIX_PATH_MAX];
1091 int i = 0;
1092
1093 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1094 return;
1095
1096 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1097 if (*path != '/')
1098 continue;
1099
1100 if ((p = strrchr(path, '\r')) != NULL)
1101 *p = 0;
1102 if ((p = strchr(path, '\n')) != NULL)
1103 *p = 0;
1104
1105 ldpaths[i++] = xstrdup(path);
1106
1107 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1108 break;
1109 }
1110 ldpaths[i] = NULL;
1111
1112 fclose(fp);
1113 }
1114
1115 /* scan /etc/ld.so.conf for paths */
1116 static void scanelf_ldpath()
1117 {
1118 char scan_l, scan_ul, scan_ull;
1119 int i = 0;
1120
1121 if (!ldpaths[0])
1122 err("Unable to load any paths from ld.so.conf");
1123
1124 scan_l = scan_ul = scan_ull = 0;
1125
1126 while (ldpaths[i]) {
1127 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1128 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1129 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1130 scanelf_dir(ldpaths[i]);
1131 ++i;
1132 }
1133
1134 if (!scan_l) scanelf_dir("/lib");
1135 if (!scan_ul) scanelf_dir("/usr/lib");
1136 if (!scan_ull) scanelf_dir("/usr/local/lib");
1137 }
1138
1139 /* scan env PATH for paths */
1140 static void scanelf_envpath()
1141 {
1142 char *path, *p;
1143
1144 path = getenv("PATH");
1145 if (!path)
1146 err("PATH is not set in your env !");
1147 path = xstrdup(path);
1148
1149 while ((p = strrchr(path, ':')) != NULL) {
1150 scanelf_dir(p + 1);
1151 *p = 0;
1152 }
1153
1154 free(path);
1155 }
1156
1157
1158 /* usage / invocation handling functions */
1159 #define PARSE_FLAGS "plRmyXxetrnLibSs:gN:TaqvF:f:o:BhV"
1160 #define a_argument required_argument
1161 static struct option const long_opts[] = {
1162 {"path", no_argument, NULL, 'p'},
1163 {"ldpath", no_argument, NULL, 'l'},
1164 {"recursive", no_argument, NULL, 'R'},
1165 {"mount", no_argument, NULL, 'm'},
1166 {"symlink", no_argument, NULL, 'y'},
1167 {"fix", no_argument, NULL, 'X'},
1168 {"pax", no_argument, NULL, 'x'},
1169 {"header", no_argument, NULL, 'e'},
1170 {"textrel", no_argument, NULL, 't'},
1171 {"rpath", no_argument, NULL, 'r'},
1172 {"needed", no_argument, NULL, 'n'},
1173 {"ldcache", no_argument, NULL, 'L'},
1174 {"interp", no_argument, NULL, 'i'},
1175 {"bind", no_argument, NULL, 'b'},
1176 {"soname", no_argument, NULL, 'S'},
1177 {"symbol", a_argument, NULL, 's'},
1178 {"lib", a_argument, NULL, 'N'},
1179 {"gmatch", no_argument, NULL, 'g'},
1180 {"textrels", no_argument, NULL, 'T'},
1181 {"all", no_argument, NULL, 'a'},
1182 {"quiet", no_argument, NULL, 'q'},
1183 {"verbose", no_argument, NULL, 'v'},
1184 {"format", a_argument, NULL, 'F'},
1185 {"from", a_argument, NULL, 'f'},
1186 {"file", a_argument, NULL, 'o'},
1187 {"nobanner", no_argument, NULL, 'B'},
1188 {"help", no_argument, NULL, 'h'},
1189 {"version", no_argument, NULL, 'V'},
1190 {NULL, no_argument, NULL, 0x0}
1191 };
1192
1193 static const char *opts_help[] = {
1194 "Scan all directories in PATH environment",
1195 "Scan all directories in /etc/ld.so.conf",
1196 "Scan directories recursively",
1197 "Don't recursively cross mount points",
1198 "Don't scan symlinks",
1199 "Try and 'fix' bad things (use with -r/-e)\n",
1200 "Print PaX markings",
1201 "Print GNU_STACK/PT_LOAD markings",
1202 "Print TEXTREL information",
1203 "Print RPATH information",
1204 "Print NEEDED information",
1205 "Utilize ld.so.cache information (use with -r/-n)",
1206 "Print INTERP information",
1207 "Print BIND information",
1208 "Print SONAME information",
1209 "Find a specified symbol",
1210 "Find a specified library",
1211 "Use strncmp to match libraries. (use with -N)",
1212 "Locate cause of TEXTREL",
1213 "Print all scanned info (-x -e -t -r -b)\n",
1214 "Only output 'bad' things",
1215 "Be verbose (can be specified more than once)",
1216 "Use specified format for output",
1217 "Read input stream from a filename",
1218 "Write output stream to a filename",
1219 "Don't display the header",
1220 "Print this help and exit",
1221 "Print version and exit",
1222 NULL
1223 };
1224
1225 /* display usage and exit */
1226 static void usage(int status)
1227 {
1228 unsigned long i;
1229 printf("* Scan ELF binaries for stuff\n\n"
1230 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1231 printf("Options: -[%s]\n", PARSE_FLAGS);
1232 for (i = 0; long_opts[i].name; ++i)
1233 if (long_opts[i].has_arg == no_argument)
1234 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1235 long_opts[i].name, opts_help[i]);
1236 else
1237 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1238 long_opts[i].name, opts_help[i]);
1239
1240 if (status != EXIT_SUCCESS)
1241 exit(status);
1242
1243 puts("\nThe format modifiers for the -F option are:");
1244 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1245 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1246 puts(" i INTERP \tb BIND \ts symbol");
1247 puts(" N library \to Type \tT TEXTRELs");
1248 puts(" S SONAME");
1249 puts(" p filename (with search path removed)");
1250 puts(" f filename (short name/basename)");
1251 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1252
1253 exit(status);
1254 }
1255
1256 /* parse command line arguments and preform needed actions */
1257 static void parseargs(int argc, char *argv[])
1258 {
1259 int i;
1260 char *from_file = NULL;
1261
1262 opterr = 0;
1263 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1264 switch (i) {
1265
1266 case 'V':
1267 printf("pax-utils-%s: %s compiled %s\n%s\n"
1268 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1269 VERSION, __FILE__, __DATE__, rcsid, argv0);
1270 exit(EXIT_SUCCESS);
1271 break;
1272 case 'h': usage(EXIT_SUCCESS); break;
1273 case 'f':
1274 if (from_file) warn("You prob don't want to specify -f twice");
1275 from_file = optarg;
1276 break;
1277 case 'o': {
1278 FILE *fp = NULL;
1279 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1280 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1281 SET_STDOUT(fp);
1282 break;
1283 }
1284
1285 case 's': {
1286 if (find_sym) warn("You prob don't want to specify -s twice");
1287 find_sym = optarg;
1288 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1289 sprintf(versioned_symname, "%s@", find_sym);
1290 break;
1291 }
1292 case 'N': {
1293 if (find_lib) warn("You prob don't want to specify -N twice");
1294 find_lib = optarg;
1295 break;
1296 }
1297
1298 case 'F': {
1299 if (out_format) warn("You prob don't want to specify -F twice");
1300 out_format = optarg;
1301 break;
1302 }
1303
1304 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1305 case 'L': use_ldcache = 1; break;
1306 case 'y': scan_symlink = 0; break;
1307 case 'B': show_banner = 0; break;
1308 case 'l': scan_ldpath = 1; break;
1309 case 'p': scan_envpath = 1; break;
1310 case 'R': dir_recurse = 1; break;
1311 case 'm': dir_crossmount = 0; break;
1312 case 'X': ++fix_elf; break;
1313 case 'x': show_pax = 1; break;
1314 case 'e': show_phdr = 1; break;
1315 case 't': show_textrel = 1; break;
1316 case 'r': show_rpath = 1; break;
1317 case 'n': show_needed = 1; break;
1318 case 'i': show_interp = 1; break;
1319 case 'b': show_bind = 1; break;
1320 case 'S': show_soname = 1; break;
1321 case 'T': show_textrels = 1; break;
1322 case 'q': be_quiet = 1; break;
1323 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1324 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1325
1326 case ':':
1327 err("Option missing parameter\n");
1328 case '?':
1329 err("Unknown option\n");
1330 default:
1331 err("Unhandled option '%c'", i);
1332 }
1333 }
1334
1335 /* let the format option override all other options */
1336 if (out_format) {
1337 show_pax = show_phdr = show_textrel = show_rpath = \
1338 show_needed = show_interp = show_bind = show_soname = \
1339 show_textrels = 0;
1340 for (i = 0; out_format[i]; ++i) {
1341 if (!IS_MODIFIER(out_format[i])) continue;
1342
1343 switch (out_format[++i]) {
1344 case '%': break;
1345 case '#': break;
1346 case 'F': break;
1347 case 'p': break;
1348 case 'f': break;
1349 case 's': break;
1350 case 'N': break;
1351 case 'o': break;
1352 case 'x': show_pax = 1; break;
1353 case 'e': show_phdr = 1; break;
1354 case 't': show_textrel = 1; break;
1355 case 'r': show_rpath = 1; break;
1356 case 'n': show_needed = 1; break;
1357 case 'i': show_interp = 1; break;
1358 case 'b': show_bind = 1; break;
1359 case 'S': show_soname = 1; break;
1360 case 'T': show_textrels = 1; break;
1361 default:
1362 err("Invalid format specifier '%c' (byte %i)",
1363 out_format[i], i+1);
1364 }
1365 }
1366
1367 /* construct our default format */
1368 } else {
1369 size_t fmt_len = 30;
1370 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1371 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1372 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1373 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1374 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1375 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1376 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1377 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1378 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1379 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1380 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1381 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1382 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1383 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1384 }
1385 if (be_verbose > 2) printf("Format: %s\n", out_format);
1386
1387 /* now lets actually do the scanning */
1388 if (scan_ldpath || use_ldcache)
1389 load_ld_so_conf();
1390 if (scan_ldpath) scanelf_ldpath();
1391 if (scan_envpath) scanelf_envpath();
1392 if (from_file) {
1393 scanelf_from_file(from_file);
1394 from_file = *argv;
1395 }
1396 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1397 err("Nothing to scan !?");
1398 while (optind < argc) {
1399 search_path = argv[optind++];
1400 scanelf_dir(search_path);
1401 }
1402
1403 /* clean up */
1404 if (versioned_symname) free(versioned_symname);
1405 for (i = 0; ldpaths[i]; ++i)
1406 free(ldpaths[i]);
1407
1408 if (ldcache != 0)
1409 munmap(ldcache, ldcache_size);
1410 }
1411
1412
1413
1414 /* utility funcs */
1415 static char *xstrdup(const char *s)
1416 {
1417 char *ret = strdup(s);
1418 if (!ret) err("Could not strdup(): %s", strerror(errno));
1419 return ret;
1420 }
1421 static void *xmalloc(size_t size)
1422 {
1423 void *ret = malloc(size);
1424 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1425 return ret;
1426 }
1427 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1428 {
1429 size_t new_len;
1430
1431 new_len = strlen(*dst) + strlen(src);
1432 if (*curr_len <= new_len) {
1433 *curr_len = new_len + (*curr_len / 2);
1434 *dst = realloc(*dst, *curr_len);
1435 if (!*dst)
1436 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1437 }
1438
1439 if (n)
1440 strncat(*dst, src, n);
1441 else
1442 strcat(*dst, src);
1443 }
1444 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1445 {
1446 static char my_app[2];
1447 my_app[0] = append;
1448 my_app[1] = '\0';
1449 xstrcat(dst, my_app, curr_len);
1450 }
1451
1452
1453
1454 int main(int argc, char *argv[])
1455 {
1456 if (argc < 2)
1457 usage(EXIT_FAILURE);
1458 parseargs(argc, argv);
1459 fclose(stdout);
1460 #ifdef __BOUNDS_CHECKING_ON
1461 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1462 #endif
1463 return EXIT_SUCCESS;
1464 }

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