/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.100 - (show annotations) (download) (as text)
Tue Jan 10 01:38:17 2006 UTC (8 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.99: +9 -8 lines
File MIME type: text/x-csrc
make sure we warn about zero length rpaths and that we dont break out of the rpath checking too early.  also dont bother duping the arg for the -f option

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 1.99 2006/01/10 01:35:06 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 1.99 2006/01/10 01:35:06 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 gmatch = 0;
57 static char printcache = 0;
58
59
60 caddr_t ldcache = 0;
61 size_t ldcache_size = 0;
62
63 /* sub-funcs for scanelf_file() */
64 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
65 {
66 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
67 #define GET_SYMTABS(B) \
68 if (elf->elf_class == ELFCLASS ## B) { \
69 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
70 /* debug sections */ \
71 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
72 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
73 /* runtime sections */ \
74 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
75 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
76 if (symtab && dynsym) { \
77 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
78 } else { \
79 *sym = (void*)(symtab ? symtab : dynsym); \
80 } \
81 if (strtab && dynstr) { \
82 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
83 } else { \
84 *tab = (void*)(strtab ? strtab : dynstr); \
85 } \
86 }
87 GET_SYMTABS(32)
88 GET_SYMTABS(64)
89 }
90 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
91 {
92 static char ret[7];
93 unsigned long i, shown;
94
95 if (!show_pax) return NULL;
96
97 shown = 0;
98 memset(&ret, 0, sizeof(ret));
99
100 if (elf->phdr) {
101 #define SHOW_PAX(B) \
102 if (elf->elf_class == ELFCLASS ## B) { \
103 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
104 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
105 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
106 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
107 continue; \
108 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
109 continue; \
110 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
111 *found_pax = 1; \
112 ++shown; \
113 break; \
114 } \
115 }
116 SHOW_PAX(32)
117 SHOW_PAX(64)
118 }
119
120 /* fall back to EI_PAX if no PT_PAX was found */
121 if (!*ret) {
122 static char *paxflags;
123 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
124 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
125 *found_pax = 1;
126 return (be_wewy_wewy_quiet ? NULL : paxflags);
127 }
128 strncpy(ret, paxflags, sizeof(ret));
129 }
130
131 if (be_wewy_wewy_quiet || (be_quiet && !shown))
132 return NULL;
133 else
134 return ret;
135 }
136
137 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
138 {
139 static char ret[12];
140 char *found;
141 unsigned long i, shown, multi_stack, multi_relro, multi_load;
142 int max_pt_load;
143
144 if (!show_phdr) return NULL;
145
146 memcpy(ret, "--- --- ---\0", 12);
147
148 shown = 0;
149 multi_stack = multi_relro = multi_load = 0;
150 max_pt_load = elf_max_pt_load(elf);
151
152 #define SHOW_PHDR(B) \
153 if (elf->elf_class == ELFCLASS ## B) { \
154 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
155 Elf ## B ## _Off offset; \
156 uint32_t flags, check_flags; \
157 if (elf->phdr != NULL) { \
158 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
159 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
160 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
161 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
162 found = found_phdr; \
163 offset = 0; \
164 check_flags = PF_X; \
165 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
166 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
167 found = found_relro; \
168 offset = 4; \
169 check_flags = PF_X; \
170 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
171 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
172 found = found_load; \
173 offset = 8; \
174 check_flags = PF_W|PF_X; \
175 } else \
176 continue; \
177 flags = EGET(phdr[i].p_flags); \
178 if (be_quiet && ((flags & check_flags) != check_flags)) \
179 continue; \
180 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
181 *found = 1; \
182 ++shown; \
183 } \
184 } else if (elf->shdr != NULL) { \
185 /* no program headers which means this is prob an object file */ \
186 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
187 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
188 check_flags = SHF_WRITE|SHF_EXECINSTR; \
189 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
190 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
191 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
192 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
193 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
194 flags = EGET(shdr[i].sh_flags); \
195 if (be_quiet && ((flags & check_flags) != check_flags)) \
196 continue; \
197 ++*found_phdr; \
198 shown = 1; \
199 if (flags & SHF_WRITE) ret[0] = 'W'; \
200 if (flags & SHF_ALLOC) ret[1] = 'A'; \
201 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
202 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
203 break; \
204 } \
205 } \
206 if (!multi_stack) { \
207 *found_phdr = 1; \
208 shown = 1; \
209 memcpy(ret, "!WX", 3); \
210 } \
211 } \
212 }
213 SHOW_PHDR(32)
214 SHOW_PHDR(64)
215
216 if (be_wewy_wewy_quiet || (be_quiet && !shown))
217 return NULL;
218 else
219 return ret;
220 }
221 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
222 {
223 static const char *ret = "TEXTREL";
224 unsigned long i;
225
226 if (!show_textrel && !show_textrels) return NULL;
227
228 if (elf->phdr) {
229 #define SHOW_TEXTREL(B) \
230 if (elf->elf_class == ELFCLASS ## B) { \
231 Elf ## B ## _Dyn *dyn; \
232 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
233 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
234 Elf ## B ## _Off offset; \
235 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
236 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
237 offset = EGET(phdr[i].p_offset); \
238 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
239 dyn = DYN ## B (elf->data + offset); \
240 while (EGET(dyn->d_tag) != DT_NULL) { \
241 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
242 *found_textrel = 1; \
243 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
244 return (be_wewy_wewy_quiet ? NULL : ret); \
245 } \
246 ++dyn; \
247 } \
248 } }
249 SHOW_TEXTREL(32)
250 SHOW_TEXTREL(64)
251 }
252
253 if (be_quiet || be_wewy_wewy_quiet)
254 return NULL;
255 else
256 return " - ";
257 }
258 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
259 {
260 unsigned long s, r, rmax;
261 void *symtab_void, *strtab_void, *text_void;
262
263 if (!show_textrels) return NULL;
264
265 /* don't search for TEXTREL's if the ELF doesn't have any */
266 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
267 if (!*found_textrel) return NULL;
268
269 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
270 text_void = elf_findsecbyname(elf, ".text");
271
272 if (symtab_void && strtab_void && text_void && elf->shdr) {
273 #define SHOW_TEXTRELS(B) \
274 if (elf->elf_class == ELFCLASS ## B) { \
275 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
276 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
277 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
278 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
279 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
280 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
281 uint ## B ## _t memsz = EGET(text->sh_size); \
282 Elf ## B ## _Rel *rel; \
283 Elf ## B ## _Rela *rela; \
284 /* search the section headers for relocations */ \
285 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
286 uint32_t sh_type = EGET(shdr[s].sh_type); \
287 if (sh_type == SHT_REL) { \
288 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
289 rela = NULL; \
290 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
291 } else if (sh_type == SHT_RELA) { \
292 rel = NULL; \
293 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
294 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
295 } else \
296 continue; \
297 /* now see if any of the relocs are in the .text */ \
298 for (r = 0; r < rmax; ++r) { \
299 unsigned long sym_max; \
300 Elf ## B ## _Addr offset_tmp; \
301 Elf ## B ## _Sym *func; \
302 Elf ## B ## _Sym *sym; \
303 Elf ## B ## _Addr r_offset; \
304 uint ## B ## _t r_info; \
305 if (sh_type == SHT_REL) { \
306 r_offset = EGET(rel[r].r_offset); \
307 r_info = EGET(rel[r].r_info); \
308 } else { \
309 r_offset = EGET(rela[r].r_offset); \
310 r_info = EGET(rela[r].r_info); \
311 } \
312 /* make sure this relocation is inside of the .text */ \
313 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
314 if (be_verbose <= 2) continue; \
315 } else \
316 *found_textrels = 1; \
317 /* locate this relocation symbol name */ \
318 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
319 sym_max = ELF ## B ## _R_SYM(r_info); \
320 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
321 sym += sym_max; \
322 else \
323 sym = NULL; \
324 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
325 /* show the raw details about this reloc */ \
326 printf(" %s: ", elf->base_filename); \
327 if (sym && sym->st_name) \
328 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
329 else \
330 printf("(memory/fake?)"); \
331 printf(" [0x%lX]", (unsigned long)r_offset); \
332 /* now try to find the closest symbol that this rel is probably in */ \
333 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
334 func = NULL; \
335 offset_tmp = 0; \
336 while (sym_max--) { \
337 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
338 func = sym; \
339 offset_tmp = EGET(sym->st_value); \
340 } \
341 ++sym; \
342 } \
343 printf(" in "); \
344 if (func && func->st_name) \
345 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
346 else \
347 printf("(NULL: fake?)"); \
348 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
349 } \
350 } }
351 SHOW_TEXTRELS(32)
352 SHOW_TEXTRELS(64)
353 }
354 if (!*found_textrels)
355 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
356
357 return NULL;
358 }
359
360 static void rpath_security_checks(elfobj *, char *);
361 static void rpath_security_checks(elfobj *elf, char *item)
362 {
363 struct stat st;
364 switch (*item) {
365 case '/': break;
366 case '.':
367 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
368 break;
369 case ':':
370 case '\0':
371 warnf("Security problem NULL RPATH in %s", elf->filename);
372 break;
373 case '$':
374 if (fstat(elf->fd, &st) != -1)
375 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
376 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
377 item, elf->filename, st.st_mode & 07777);
378 break;
379 default:
380 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
381 break;
382 }
383 }
384 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
385 {
386 unsigned long i, s;
387 char *rpath, *runpath, **r;
388 void *strtbl_void;
389
390 if (!show_rpath) return;
391
392 strtbl_void = elf_findsecbyname(elf, ".dynstr");
393 rpath = runpath = NULL;
394
395 if (elf->phdr && strtbl_void) {
396 #define SHOW_RPATH(B) \
397 if (elf->elf_class == ELFCLASS ## B) { \
398 Elf ## B ## _Dyn *dyn; \
399 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
400 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
401 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
402 Elf ## B ## _Off offset; \
403 Elf ## B ## _Xword word; \
404 /* Scan all the program headers */ \
405 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
406 /* Just scan dynamic headers */ \
407 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
408 offset = EGET(phdr[i].p_offset); \
409 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
410 /* Just scan dynamic RPATH/RUNPATH headers */ \
411 dyn = DYN ## B (elf->data + offset); \
412 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
413 if (word == DT_RPATH) { \
414 r = &rpath; \
415 } else if (word == DT_RUNPATH) { \
416 r = &runpath; \
417 } else { \
418 ++dyn; \
419 continue; \
420 } \
421 /* Verify the memory is somewhat sane */ \
422 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
423 if (offset < (Elf ## B ## _Off)elf->len) { \
424 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
425 *r = (char*)(elf->data + offset); \
426 /* If quiet, don't output paths in ld.so.conf */ \
427 if (be_quiet) { \
428 size_t len; \
429 char *start, *end; \
430 /* note that we only 'chop' off leading known paths. */ \
431 /* since *r is read-only memory, we can only move the ptr forward. */ \
432 start = *r; \
433 /* scan each path in : delimited list */ \
434 while (start) { \
435 rpath_security_checks(elf, start); \
436 end = strchr(start, ':'); \
437 len = (end ? abs(end - start) : strlen(start)); \
438 for (s = 0; ldpaths[s]; ++s) { \
439 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
440 *r = (end ? end + 1 : NULL); \
441 break; \
442 } \
443 } \
444 if (!*r || !end) \
445 break; \
446 else \
447 start = start + len + 1; \
448 } \
449 } \
450 if (*r) *found_rpath = 1; \
451 } \
452 ++dyn; \
453 } \
454 } }
455 SHOW_RPATH(32)
456 SHOW_RPATH(64)
457 }
458
459 if (be_wewy_wewy_quiet) return;
460
461 if (rpath && runpath) {
462 if (!strcmp(rpath, runpath)) {
463 xstrcat(ret, runpath, ret_len);
464 } else {
465 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
466 xchrcat(ret, '{', ret_len);
467 xstrcat(ret, rpath, ret_len);
468 xchrcat(ret, ',', ret_len);
469 xstrcat(ret, runpath, ret_len);
470 xchrcat(ret, '}', ret_len);
471 }
472 } else if (rpath || runpath)
473 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
474 else if (!be_quiet)
475 xstrcat(ret, " - ", ret_len);
476 }
477
478 #define LDSO_CACHE_MAGIC "ld.so-"
479 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
480 #define LDSO_CACHE_VER "1.7.0"
481 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
482 #define FLAG_ANY -1
483 #define FLAG_TYPE_MASK 0x00ff
484 #define FLAG_LIBC4 0x0000
485 #define FLAG_ELF 0x0001
486 #define FLAG_ELF_LIBC5 0x0002
487 #define FLAG_ELF_LIBC6 0x0003
488 #define FLAG_REQUIRED_MASK 0xff00
489 #define FLAG_SPARC_LIB64 0x0100
490 #define FLAG_IA64_LIB64 0x0200
491 #define FLAG_X8664_LIB64 0x0300
492 #define FLAG_S390_LIB64 0x0400
493 #define FLAG_POWERPC_LIB64 0x0500
494 #define FLAG_MIPS64_LIBN32 0x0600
495 #define FLAG_MIPS64_LIBN64 0x0700
496
497 static char *lookup_cache_lib(elfobj *, char *);
498 static char *lookup_cache_lib(elfobj *elf, char *fname)
499 {
500 int fd = 0;
501 char *strs;
502 static char buf[_POSIX_PATH_MAX] = "";
503 const char *cachefile = "/etc/ld.so.cache";
504 struct stat st;
505
506 typedef struct {
507 char magic[LDSO_CACHE_MAGIC_LEN];
508 char version[LDSO_CACHE_VER_LEN];
509 int nlibs;
510 } header_t;
511 header_t *header;
512
513 typedef struct {
514 int flags;
515 int sooffset;
516 int liboffset;
517 } libentry_t;
518 libentry_t *libent;
519
520 if (fname == NULL)
521 return NULL;
522
523 if (ldcache == 0) {
524 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
525 return NULL;
526
527 /* cache these values so we only map/unmap the cache file once */
528 ldcache_size = st.st_size;
529 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
530
531 close(fd);
532
533 if (ldcache == (caddr_t)-1)
534 return NULL;
535
536 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
537 return NULL;
538 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
539 return NULL;
540 }
541
542 header = (header_t *) ldcache;
543 libent = (libentry_t *) (ldcache + sizeof(header_t));
544 strs = (char *) &libent[header->nlibs];
545
546 for (fd = 0; fd < header->nlibs; fd++) {
547 /* this should be more fine grained, but for now we assume that
548 * diff arches will not be cached together. and we ignore the
549 * the different multilib mips cases. */
550 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
551 continue;
552 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
553 continue;
554
555 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
556 continue;
557 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
558 }
559 return buf;
560 }
561
562
563 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
564 {
565 unsigned long i;
566 char *needed;
567 void *strtbl_void;
568 char *p;
569
570 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
571
572 strtbl_void = elf_findsecbyname(elf, ".dynstr");
573
574 if (elf->phdr && strtbl_void) {
575 #define SHOW_NEEDED(B) \
576 if (elf->elf_class == ELFCLASS ## B) { \
577 Elf ## B ## _Dyn *dyn; \
578 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
579 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
580 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
581 Elf ## B ## _Off offset; \
582 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
583 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
584 offset = EGET(phdr[i].p_offset); \
585 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
586 dyn = DYN ## B (elf->data + offset); \
587 while (EGET(dyn->d_tag) != DT_NULL) { \
588 if (EGET(dyn->d_tag) == DT_NEEDED) { \
589 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
590 if (offset >= (Elf ## B ## _Off)elf->len) { \
591 ++dyn; \
592 continue; \
593 } \
594 needed = (char*)(elf->data + offset); \
595 if (op == 0) { \
596 if (!be_wewy_wewy_quiet) { \
597 if (*found_needed) xchrcat(ret, ',', ret_len); \
598 if (printcache) \
599 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
600 needed = p; \
601 xstrcat(ret, needed, ret_len); \
602 } \
603 *found_needed = 1; \
604 } else { \
605 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
606 *found_lib = 1; \
607 return (be_wewy_wewy_quiet ? NULL : needed); \
608 } \
609 } \
610 } \
611 ++dyn; \
612 } \
613 } }
614 SHOW_NEEDED(32)
615 SHOW_NEEDED(64)
616 if (op == 0 && !*found_needed && be_verbose)
617 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
618 }
619
620 return NULL;
621 }
622 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
623 {
624 void *strtbl_void;
625
626 if (!show_interp) return NULL;
627
628 strtbl_void = elf_findsecbyname(elf, ".interp");
629
630 if (strtbl_void) {
631 #define SHOW_INTERP(B) \
632 if (elf->elf_class == ELFCLASS ## B) { \
633 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
634 *found_interp = 1; \
635 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
636 }
637 SHOW_INTERP(32)
638 SHOW_INTERP(64)
639 }
640 return NULL;
641 }
642 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
643 {
644 unsigned long i;
645 struct stat s;
646
647 if (!show_bind) return NULL;
648 if (!elf->phdr) return NULL;
649
650 #define SHOW_BIND(B) \
651 if (elf->elf_class == ELFCLASS ## B) { \
652 Elf ## B ## _Dyn *dyn; \
653 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
654 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
655 Elf ## B ## _Off offset; \
656 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
657 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
658 offset = EGET(phdr[i].p_offset); \
659 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
660 dyn = DYN ## B (elf->data + offset); \
661 while (EGET(dyn->d_tag) != DT_NULL) { \
662 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
663 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
664 { \
665 if (be_quiet) return NULL; \
666 *found_bind = 1; \
667 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
668 } \
669 ++dyn; \
670 } \
671 } \
672 }
673 SHOW_BIND(32)
674 SHOW_BIND(64)
675
676 if (be_wewy_wewy_quiet) return NULL;
677
678 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
679 return NULL;
680 } else {
681 *found_bind = 1;
682 return (char *) "LAZY";
683 }
684 }
685 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
686 {
687 unsigned long i;
688 char *soname;
689 void *strtbl_void;
690
691 if (!show_soname) return NULL;
692
693 strtbl_void = elf_findsecbyname(elf, ".dynstr");
694
695 if (elf->phdr && strtbl_void) {
696 #define SHOW_SONAME(B) \
697 if (elf->elf_class == ELFCLASS ## B) { \
698 Elf ## B ## _Dyn *dyn; \
699 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
700 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
701 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
702 Elf ## B ## _Off offset; \
703 /* only look for soname in shared objects */ \
704 if (ehdr->e_type != ET_DYN) \
705 return NULL; \
706 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
707 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
708 offset = EGET(phdr[i].p_offset); \
709 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
710 dyn = DYN ## B (elf->data + offset); \
711 while (EGET(dyn->d_tag) != DT_NULL) { \
712 if (EGET(dyn->d_tag) == DT_SONAME) { \
713 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
714 if (offset >= (Elf ## B ## _Off)elf->len) { \
715 ++dyn; \
716 continue; \
717 } \
718 soname = (char*)(elf->data + offset); \
719 *found_soname = 1; \
720 return (be_wewy_wewy_quiet ? NULL : soname); \
721 } \
722 ++dyn; \
723 } \
724 } }
725 SHOW_SONAME(32)
726 SHOW_SONAME(64)
727 }
728
729 return NULL;
730 }
731 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
732 {
733 unsigned long i;
734 char *ret;
735 void *symtab_void, *strtab_void;
736
737 if (!find_sym) return NULL;
738 ret = find_sym;
739
740 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
741
742 if (symtab_void && strtab_void) {
743 #define FIND_SYM(B) \
744 if (elf->elf_class == ELFCLASS ## B) { \
745 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
746 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
747 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
748 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
749 char *symname; \
750 for (i = 0; i < cnt; ++i) { \
751 if (sym->st_name) { \
752 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
753 if (*find_sym == '*') { \
754 printf("%s(%s) %5lX %15s %s\n", \
755 ((*found_sym == 0) ? "\n\t" : "\t"), \
756 elf->base_filename, \
757 (unsigned long)sym->st_size, \
758 get_elfstttype(sym->st_info), \
759 symname); \
760 *found_sym = 1; \
761 } else { \
762 char *this_sym, *next_sym; \
763 this_sym = find_sym; \
764 do { \
765 next_sym = strchr(this_sym, ','); \
766 if (next_sym == NULL) \
767 next_sym = this_sym + strlen(this_sym); \
768 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
769 (strcmp(symname, versioned_symname) == 0)) { \
770 ret = this_sym; \
771 (*found_sym)++; \
772 goto break_out; \
773 } \
774 this_sym = next_sym + 1; \
775 } while (*next_sym != '\0'); \
776 } \
777 } \
778 ++sym; \
779 } }
780 FIND_SYM(32)
781 FIND_SYM(64)
782 }
783
784 break_out:
785 if (be_wewy_wewy_quiet) return NULL;
786
787 if (*find_sym != '*' && *found_sym)
788 return ret;
789 if (be_quiet)
790 return NULL;
791 else
792 return (char *)" - ";
793 }
794 /* scan an elf file and show all the fun stuff */
795 #define prints(str) write(fileno(stdout), str, strlen(str))
796 static void scanelf_file(const char *filename)
797 {
798 unsigned long i;
799 char found_pax, found_phdr, found_relro, found_load, found_textrel,
800 found_rpath, found_needed, found_interp, found_bind, found_soname,
801 found_sym, found_lib, found_file, found_textrels;
802 elfobj *elf;
803 struct stat st;
804 static char *out_buffer = NULL;
805 static size_t out_len;
806
807 /* make sure 'filename' exists */
808 if (lstat(filename, &st) == -1) {
809 if (be_verbose > 2) printf("%s: does not exist\n", filename);
810 return;
811 }
812 /* always handle regular files and handle symlinked files if no -y */
813 if (S_ISLNK(st.st_mode)) {
814 if (!scan_symlink) return;
815 stat(filename, &st);
816 }
817 if (!S_ISREG(st.st_mode)) {
818 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
819 return;
820 }
821
822 found_pax = found_phdr = found_relro = found_load = found_textrel = \
823 found_rpath = found_needed = found_interp = found_bind = found_soname = \
824 found_sym = found_lib = found_file = found_textrels = 0;
825
826 /* verify this is real ELF */
827 if ((elf = readelf(filename)) == NULL) {
828 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
829 return;
830 }
831
832 if (be_verbose > 1)
833 printf("%s: scanning file {%s,%s}\n", filename,
834 get_elfeitype(EI_CLASS, elf->elf_class),
835 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
836 else if (be_verbose)
837 printf("%s: scanning file\n", filename);
838
839 /* init output buffer */
840 if (!out_buffer) {
841 out_len = sizeof(char) * 80;
842 out_buffer = (char*)xmalloc(out_len);
843 }
844 *out_buffer = '\0';
845
846 /* show the header */
847 if (!be_quiet && show_banner) {
848 for (i = 0; out_format[i]; ++i) {
849 if (!IS_MODIFIER(out_format[i])) continue;
850
851 switch (out_format[++i]) {
852 case '%': break;
853 case '#': break;
854 case 'F':
855 case 'p':
856 case 'f': prints("FILE "); found_file = 1; break;
857 case 'o': prints(" TYPE "); break;
858 case 'x': prints(" PAX "); break;
859 case 'e': prints("STK/REL/PTL "); break;
860 case 't': prints("TEXTREL "); break;
861 case 'r': prints("RPATH "); break;
862 case 'n': prints("NEEDED "); break;
863 case 'i': prints("INTERP "); break;
864 case 'b': prints("BIND "); break;
865 case 'S': prints("SONAME "); break;
866 case 's': prints("SYM "); break;
867 case 'N': prints("LIB "); break;
868 case 'T': prints("TEXTRELS "); break;
869 default: warnf("'%c' has no title ?", out_format[i]);
870 }
871 }
872 if (!found_file) prints("FILE ");
873 prints("\n");
874 found_file = 0;
875 show_banner = 0;
876 }
877
878 /* dump all the good stuff */
879 for (i = 0; out_format[i]; ++i) {
880 const char *out;
881 const char *tmp;
882
883 /* make sure we trim leading spaces in quiet mode */
884 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
885 *out_buffer = '\0';
886
887 if (!IS_MODIFIER(out_format[i])) {
888 xchrcat(&out_buffer, out_format[i], &out_len);
889 continue;
890 }
891
892 out = NULL;
893 be_wewy_wewy_quiet = (out_format[i] == '#');
894 switch (out_format[++i]) {
895 case '%':
896 case '#':
897 xchrcat(&out_buffer, out_format[i], &out_len); break;
898 case 'F':
899 found_file = 1;
900 if (be_wewy_wewy_quiet) break;
901 xstrcat(&out_buffer, filename, &out_len);
902 break;
903 case 'p':
904 found_file = 1;
905 if (be_wewy_wewy_quiet) break;
906 tmp = filename;
907 if (search_path) {
908 ssize_t len_search = strlen(search_path);
909 ssize_t len_file = strlen(filename);
910 if (!strncmp(filename, search_path, len_search) && \
911 len_file > len_search)
912 tmp += len_search;
913 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
914 }
915 xstrcat(&out_buffer, tmp, &out_len);
916 break;
917 case 'f':
918 found_file = 1;
919 if (be_wewy_wewy_quiet) break;
920 tmp = strrchr(filename, '/');
921 tmp = (tmp == NULL ? filename : tmp+1);
922 xstrcat(&out_buffer, tmp, &out_len);
923 break;
924 case 'o': out = get_elfetype(elf); break;
925 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
926 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
927 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
928 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
929 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
930 case 'n':
931 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
932 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
933 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
934 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
935 case 's': out = scanelf_file_sym(elf, &found_sym); break;
936 default: warnf("'%c' has no scan code?", out_format[i]);
937 }
938 if (out) {
939 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
940 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
941 xstrncat(&out_buffer, out, &out_len, (tmp-out));
942 else
943 xstrcat(&out_buffer, out, &out_len);
944 }
945 }
946
947 #define FOUND_SOMETHING() \
948 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
949 found_rpath || found_needed || found_interp || found_bind || \
950 found_soname || found_sym || found_lib || found_textrels)
951
952 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
953 xchrcat(&out_buffer, ' ', &out_len);
954 xstrcat(&out_buffer, filename, &out_len);
955 }
956 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
957 puts(out_buffer);
958 fflush(stdout);
959 }
960
961 unreadelf(elf);
962 }
963
964 /* scan a directory for ET_EXEC files and print when we find one */
965 static void scanelf_dir(const char *path)
966 {
967 register DIR *dir;
968 register struct dirent *dentry;
969 struct stat st_top, st;
970 char buf[_POSIX_PATH_MAX];
971 size_t pathlen = 0, len = 0;
972
973 /* make sure path exists */
974 if (lstat(path, &st_top) == -1) {
975 if (be_verbose > 2) printf("%s: does not exist\n", path);
976 return;
977 }
978
979 /* ok, if it isn't a directory, assume we can open it */
980 if (!S_ISDIR(st_top.st_mode)) {
981 scanelf_file(path);
982 return;
983 }
984
985 /* now scan the dir looking for fun stuff */
986 if ((dir = opendir(path)) == NULL) {
987 warnf("could not opendir %s: %s", path, strerror(errno));
988 return;
989 }
990 if (be_verbose) printf("%s: scanning dir\n", path);
991
992 pathlen = strlen(path);
993 while ((dentry = readdir(dir))) {
994 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
995 continue;
996 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
997 if (len >= sizeof(buf)) {
998 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
999 (unsigned long)len, (unsigned long)sizeof(buf));
1000 continue;
1001 }
1002 sprintf(buf, "%s/%s", path, dentry->d_name);
1003 if (lstat(buf, &st) != -1) {
1004 if (S_ISREG(st.st_mode))
1005 scanelf_file(buf);
1006 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1007 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1008 scanelf_dir(buf);
1009 }
1010 }
1011 }
1012 closedir(dir);
1013 }
1014
1015 static int scanelf_from_file(char *filename)
1016 {
1017 FILE *fp = NULL;
1018 char *p;
1019 char path[_POSIX_PATH_MAX];
1020
1021 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1022 fp = stdin;
1023 else if ((fp = fopen(filename, "r")) == NULL)
1024 return 1;
1025
1026 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1027 if ((p = strchr(path, '\n')) != NULL)
1028 *p = 0;
1029 search_path = path;
1030 scanelf_dir(path);
1031 }
1032 if (fp != stdin)
1033 fclose(fp);
1034 return 0;
1035 }
1036
1037 static void load_ld_so_conf()
1038 {
1039 FILE *fp = NULL;
1040 char *p;
1041 char path[_POSIX_PATH_MAX];
1042 int i = 0;
1043
1044 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1045 return;
1046
1047 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1048 if (*path != '/')
1049 continue;
1050
1051 if ((p = strrchr(path, '\r')) != NULL)
1052 *p = 0;
1053 if ((p = strchr(path, '\n')) != NULL)
1054 *p = 0;
1055
1056 ldpaths[i++] = xstrdup(path);
1057
1058 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1059 break;
1060 }
1061 ldpaths[i] = NULL;
1062
1063 fclose(fp);
1064 }
1065
1066 /* scan /etc/ld.so.conf for paths */
1067 static void scanelf_ldpath()
1068 {
1069 char scan_l, scan_ul, scan_ull;
1070 int i = 0;
1071
1072 if (!ldpaths[0])
1073 err("Unable to load any paths from ld.so.conf");
1074
1075 scan_l = scan_ul = scan_ull = 0;
1076
1077 while (ldpaths[i]) {
1078 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1079 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1080 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1081 scanelf_dir(ldpaths[i]);
1082 ++i;
1083 }
1084
1085 if (!scan_l) scanelf_dir("/lib");
1086 if (!scan_ul) scanelf_dir("/usr/lib");
1087 if (!scan_ull) scanelf_dir("/usr/local/lib");
1088 }
1089
1090 /* scan env PATH for paths */
1091 static void scanelf_envpath()
1092 {
1093 char *path, *p;
1094
1095 path = getenv("PATH");
1096 if (!path)
1097 err("PATH is not set in your env !");
1098 path = xstrdup(path);
1099
1100 while ((p = strrchr(path, ':')) != NULL) {
1101 scanelf_dir(p + 1);
1102 *p = 0;
1103 }
1104
1105 free(path);
1106 }
1107
1108
1109 /* usage / invocation handling functions */
1110 #define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV"
1111 #define a_argument required_argument
1112 static struct option const long_opts[] = {
1113 {"path", no_argument, NULL, 'p'},
1114 {"ldpath", no_argument, NULL, 'l'},
1115 {"recursive", no_argument, NULL, 'R'},
1116 {"mount", no_argument, NULL, 'm'},
1117 {"symlink", no_argument, NULL, 'y'},
1118 {"pax", no_argument, NULL, 'x'},
1119 {"header", no_argument, NULL, 'e'},
1120 {"textrel", no_argument, NULL, 't'},
1121 {"rpath", no_argument, NULL, 'r'},
1122 {"needed", no_argument, NULL, 'n'},
1123 {"ldcache", no_argument, NULL, 'L'},
1124 {"interp", no_argument, NULL, 'i'},
1125 {"bind", no_argument, NULL, 'b'},
1126 {"soname", no_argument, NULL, 'S'},
1127 {"symbol", a_argument, NULL, 's'},
1128 {"lib", a_argument, NULL, 'N'},
1129 {"gmatch", no_argument, NULL, 'g'},
1130 {"textrels", no_argument, NULL, 'T'},
1131 {"all", no_argument, NULL, 'a'},
1132 {"quiet", no_argument, NULL, 'q'},
1133 {"verbose", no_argument, NULL, 'v'},
1134 {"format", a_argument, NULL, 'F'},
1135 {"from", a_argument, NULL, 'f'},
1136 {"file", a_argument, NULL, 'o'},
1137 {"nobanner", no_argument, NULL, 'B'},
1138 {"help", no_argument, NULL, 'h'},
1139 {"version", no_argument, NULL, 'V'},
1140 {NULL, no_argument, NULL, 0x0}
1141 };
1142
1143 static const char *opts_help[] = {
1144 "Scan all directories in PATH environment",
1145 "Scan all directories in /etc/ld.so.conf",
1146 "Scan directories recursively",
1147 "Don't recursively cross mount points",
1148 "Don't scan symlinks\n",
1149 "Print PaX markings",
1150 "Print GNU_STACK/PT_LOAD markings",
1151 "Print TEXTREL information",
1152 "Print RPATH information",
1153 "Print NEEDED information",
1154 "Resolve NEEDED information (use with -n)",
1155 "Print INTERP information",
1156 "Print BIND information",
1157 "Print SONAME information",
1158 "Find a specified symbol",
1159 "Find a specified library",
1160 "Use strncmp to match libraries. (use with -N)",
1161 "Locate cause of TEXTREL",
1162 "Print all scanned info (-x -e -t -r -b)\n",
1163 "Only output 'bad' things",
1164 "Be verbose (can be specified more than once)",
1165 "Use specified format for output",
1166 "Read input stream from a filename",
1167 "Write output stream to a filename",
1168 "Don't display the header",
1169 "Print this help and exit",
1170 "Print version and exit",
1171 NULL
1172 };
1173
1174 /* display usage and exit */
1175 static void usage(int status)
1176 {
1177 unsigned long i;
1178 printf("* Scan ELF binaries for stuff\n\n"
1179 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1180 printf("Options: -[%s]\n", PARSE_FLAGS);
1181 for (i = 0; long_opts[i].name; ++i)
1182 if (long_opts[i].has_arg == no_argument)
1183 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1184 long_opts[i].name, opts_help[i]);
1185 else
1186 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1187 long_opts[i].name, opts_help[i]);
1188
1189 if (status != EXIT_SUCCESS)
1190 exit(status);
1191
1192 puts("\nThe format modifiers for the -F option are:");
1193 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1194 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1195 puts(" i INTERP \tb BIND \ts symbol");
1196 puts(" N library \to Type \tT TEXTRELs");
1197 puts(" S SONAME");
1198 puts(" p filename (with search path removed)");
1199 puts(" f filename (short name/basename)");
1200 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1201
1202 exit(status);
1203 }
1204
1205 /* parse command line arguments and preform needed actions */
1206 static void parseargs(int argc, char *argv[])
1207 {
1208 int i;
1209 char *from_file = NULL;
1210
1211 opterr = 0;
1212 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1213 switch (i) {
1214
1215 case 'V':
1216 printf("pax-utils-%s: %s compiled %s\n%s\n"
1217 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1218 VERSION, __FILE__, __DATE__, rcsid, argv0);
1219 exit(EXIT_SUCCESS);
1220 break;
1221 case 'h': usage(EXIT_SUCCESS); break;
1222 case 'f':
1223 if (from_file) warn("You prob don't want to specify -f twice");
1224 from_file = optarg;
1225 break;
1226 case 'o': {
1227 FILE *fp = NULL;
1228 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1229 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1230 SET_STDOUT(fp);
1231 break;
1232 }
1233
1234 case 's': {
1235 if (find_sym) warn("You prob don't want to specify -s twice");
1236 find_sym = optarg;
1237 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1238 sprintf(versioned_symname, "%s@", find_sym);
1239 break;
1240 }
1241 case 'N': {
1242 if (find_lib) warn("You prob don't want to specify -N twice");
1243 find_lib = optarg;
1244 break;
1245 }
1246
1247 case 'F': {
1248 if (out_format) warn("You prob don't want to specify -F twice");
1249 out_format = optarg;
1250 break;
1251 }
1252
1253 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1254 case 'L': printcache = 1; break;
1255 case 'y': scan_symlink = 0; break;
1256 case 'B': show_banner = 0; break;
1257 case 'l': scan_ldpath = 1; break;
1258 case 'p': scan_envpath = 1; break;
1259 case 'R': dir_recurse = 1; break;
1260 case 'm': dir_crossmount = 0; break;
1261 case 'x': show_pax = 1; break;
1262 case 'e': show_phdr = 1; break;
1263 case 't': show_textrel = 1; break;
1264 case 'r': show_rpath = 1; break;
1265 case 'n': show_needed = 1; break;
1266 case 'i': show_interp = 1; break;
1267 case 'b': show_bind = 1; break;
1268 case 'S': show_soname = 1; break;
1269 case 'T': show_textrels = 1; break;
1270 case 'q': be_quiet = 1; break;
1271 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1272 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1273
1274 case ':':
1275 err("Option missing parameter\n");
1276 case '?':
1277 err("Unknown option\n");
1278 default:
1279 err("Unhandled option '%c'", i);
1280 }
1281 }
1282
1283 /* let the format option override all other options */
1284 if (out_format) {
1285 show_pax = show_phdr = show_textrel = show_rpath = \
1286 show_needed = show_interp = show_bind = show_soname = \
1287 show_textrels = 0;
1288 for (i = 0; out_format[i]; ++i) {
1289 if (!IS_MODIFIER(out_format[i])) continue;
1290
1291 switch (out_format[++i]) {
1292 case '%': break;
1293 case '#': break;
1294 case 'F': break;
1295 case 'p': break;
1296 case 'f': break;
1297 case 's': break;
1298 case 'N': break;
1299 case 'o': break;
1300 case 'x': show_pax = 1; break;
1301 case 'e': show_phdr = 1; break;
1302 case 't': show_textrel = 1; break;
1303 case 'r': show_rpath = 1; break;
1304 case 'n': show_needed = 1; break;
1305 case 'i': show_interp = 1; break;
1306 case 'b': show_bind = 1; break;
1307 case 'S': show_soname = 1; break;
1308 case 'T': show_textrels = 1; break;
1309 default:
1310 err("Invalid format specifier '%c' (byte %i)",
1311 out_format[i], i+1);
1312 }
1313 }
1314
1315 /* construct our default format */
1316 } else {
1317 size_t fmt_len = 30;
1318 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1319 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1320 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1321 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1322 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1323 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1324 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1325 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1326 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1327 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1328 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1329 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1330 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1331 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1332 }
1333 if (be_verbose > 2) printf("Format: %s\n", out_format);
1334
1335 /* now lets actually do the scanning */
1336 if (scan_ldpath || (show_rpath && be_quiet))
1337 load_ld_so_conf();
1338 if (scan_ldpath) scanelf_ldpath();
1339 if (scan_envpath) scanelf_envpath();
1340 if (from_file) {
1341 scanelf_from_file(from_file);
1342 from_file = *argv;
1343 }
1344 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1345 err("Nothing to scan !?");
1346 while (optind < argc) {
1347 search_path = argv[optind++];
1348 scanelf_dir(search_path);
1349 }
1350
1351 /* clean up */
1352 if (versioned_symname) free(versioned_symname);
1353 for (i = 0; ldpaths[i]; ++i)
1354 free(ldpaths[i]);
1355
1356 if (ldcache != 0)
1357 munmap(ldcache, ldcache_size);
1358 }
1359
1360
1361
1362 /* utility funcs */
1363 static char *xstrdup(const char *s)
1364 {
1365 char *ret = strdup(s);
1366 if (!ret) err("Could not strdup(): %s", strerror(errno));
1367 return ret;
1368 }
1369 static void *xmalloc(size_t size)
1370 {
1371 void *ret = malloc(size);
1372 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1373 return ret;
1374 }
1375 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1376 {
1377 size_t new_len;
1378
1379 new_len = strlen(*dst) + strlen(src);
1380 if (*curr_len <= new_len) {
1381 *curr_len = new_len + (*curr_len / 2);
1382 *dst = realloc(*dst, *curr_len);
1383 if (!*dst)
1384 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1385 }
1386
1387 if (n)
1388 strncat(*dst, src, n);
1389 else
1390 strcat(*dst, src);
1391 }
1392 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1393 {
1394 static char my_app[2];
1395 my_app[0] = append;
1396 my_app[1] = '\0';
1397 xstrcat(dst, my_app, curr_len);
1398 }
1399
1400
1401
1402 int main(int argc, char *argv[])
1403 {
1404 if (argc < 2)
1405 usage(EXIT_FAILURE);
1406 parseargs(argc, argv);
1407 fclose(stdout);
1408 #ifdef __BOUNDS_CHECKING_ON
1409 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1410 #endif
1411 return EXIT_SUCCESS;
1412 }

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