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Revision 1.98 - (show annotations) (download) (as text)
Thu Jan 5 03:12:07 2006 UTC (8 years, 7 months ago) by vapier
Branch: MAIN
Changes since 1.97: +5 -19 lines
File MIME type: text/x-csrc
update copyright years and unify headers in porting.h

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 1.97 2005/12/29 14:03:25 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 1.97 2005/12/29 14:03:25 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;
142 unsigned char multi_stack, multi_relro, multi_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
151 #define SHOW_PHDR(B) \
152 if (elf->elf_class == ELFCLASS ## B) { \
153 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
154 Elf ## B ## _Off offset; \
155 uint32_t flags, check_flags; \
156 if (elf->phdr != NULL) { \
157 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
158 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
159 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
160 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
161 found = found_phdr; \
162 offset = 0; \
163 check_flags = PF_X; \
164 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
165 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
166 found = found_relro; \
167 offset = 4; \
168 check_flags = PF_X; \
169 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
170 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
171 found = found_load; \
172 offset = 8; \
173 check_flags = PF_W|PF_X; \
174 } else \
175 continue; \
176 flags = EGET(phdr[i].p_flags); \
177 if (be_quiet && ((flags & check_flags) != check_flags)) \
178 continue; \
179 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
180 *found = 1; \
181 ++shown; \
182 } \
183 } else if (elf->shdr != NULL) { \
184 /* no program headers which means this is prob an object file */ \
185 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
186 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
187 check_flags = SHF_WRITE|SHF_EXECINSTR; \
188 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
189 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
190 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
191 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
192 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
193 flags = EGET(shdr[i].sh_flags); \
194 if (be_quiet && ((flags & check_flags) != check_flags)) \
195 continue; \
196 ++*found_phdr; \
197 shown = 1; \
198 if (flags & SHF_WRITE) ret[0] = 'W'; \
199 if (flags & SHF_ALLOC) ret[1] = 'A'; \
200 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
201 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
202 break; \
203 } \
204 } \
205 if (!multi_stack) { \
206 *found_phdr = 1; \
207 shown = 1; \
208 memcpy(ret, "!WX", 3); \
209 } \
210 } \
211 }
212 SHOW_PHDR(32)
213 SHOW_PHDR(64)
214
215 if (be_wewy_wewy_quiet || (be_quiet && !shown))
216 return NULL;
217 else
218 return ret;
219 }
220 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
221 {
222 static const char *ret = "TEXTREL";
223 unsigned long i;
224
225 if (!show_textrel && !show_textrels) return NULL;
226
227 if (elf->phdr) {
228 #define SHOW_TEXTREL(B) \
229 if (elf->elf_class == ELFCLASS ## B) { \
230 Elf ## B ## _Dyn *dyn; \
231 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
232 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
233 Elf ## B ## _Off offset; \
234 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
235 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
236 offset = EGET(phdr[i].p_offset); \
237 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
238 dyn = DYN ## B (elf->data + offset); \
239 while (EGET(dyn->d_tag) != DT_NULL) { \
240 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
241 *found_textrel = 1; \
242 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
243 return (be_wewy_wewy_quiet ? NULL : ret); \
244 } \
245 ++dyn; \
246 } \
247 } }
248 SHOW_TEXTREL(32)
249 SHOW_TEXTREL(64)
250 }
251
252 if (be_quiet || be_wewy_wewy_quiet)
253 return NULL;
254 else
255 return " - ";
256 }
257 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
258 {
259 unsigned long s, r, rmax;
260 void *symtab_void, *strtab_void, *text_void;
261
262 if (!show_textrels) return NULL;
263
264 /* don't search for TEXTREL's if the ELF doesn't have any */
265 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
266 if (!*found_textrel) return NULL;
267
268 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
269 text_void = elf_findsecbyname(elf, ".text");
270
271 if (symtab_void && strtab_void && text_void && elf->shdr) {
272 #define SHOW_TEXTRELS(B) \
273 if (elf->elf_class == ELFCLASS ## B) { \
274 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
275 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
276 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
277 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
278 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
279 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
280 uint ## B ## _t memsz = EGET(text->sh_size); \
281 Elf ## B ## _Rel *rel; \
282 Elf ## B ## _Rela *rela; \
283 /* search the section headers for relocations */ \
284 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
285 uint32_t sh_type = EGET(shdr[s].sh_type); \
286 if (sh_type == SHT_REL) { \
287 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
288 rela = NULL; \
289 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
290 } else if (sh_type == SHT_RELA) { \
291 rel = NULL; \
292 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
293 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
294 } else \
295 continue; \
296 /* now see if any of the relocs are in the .text */ \
297 for (r = 0; r < rmax; ++r) { \
298 unsigned long sym_max; \
299 Elf ## B ## _Addr offset_tmp; \
300 Elf ## B ## _Sym *func; \
301 Elf ## B ## _Sym *sym; \
302 Elf ## B ## _Addr r_offset; \
303 uint ## B ## _t r_info; \
304 if (sh_type == SHT_REL) { \
305 r_offset = EGET(rel[r].r_offset); \
306 r_info = EGET(rel[r].r_info); \
307 } else { \
308 r_offset = EGET(rela[r].r_offset); \
309 r_info = EGET(rela[r].r_info); \
310 } \
311 /* make sure this relocation is inside of the .text */ \
312 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
313 if (be_verbose <= 2) continue; \
314 } else \
315 *found_textrels = 1; \
316 /* locate this relocation symbol name */ \
317 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
318 sym_max = ELF ## B ## _R_SYM(r_info); \
319 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
320 sym += sym_max; \
321 else \
322 sym = NULL; \
323 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
324 /* show the raw details about this reloc */ \
325 printf(" %s: ", elf->base_filename); \
326 if (sym && sym->st_name) \
327 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
328 else \
329 printf("(memory/fake?)"); \
330 printf(" [0x%lX]", (unsigned long)r_offset); \
331 /* now try to find the closest symbol that this rel is probably in */ \
332 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
333 func = NULL; \
334 offset_tmp = 0; \
335 while (sym_max--) { \
336 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
337 func = sym; \
338 offset_tmp = EGET(sym->st_value); \
339 } \
340 ++sym; \
341 } \
342 printf(" in "); \
343 if (func && func->st_name) \
344 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
345 else \
346 printf("(NULL: fake?)"); \
347 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
348 } \
349 } }
350 SHOW_TEXTRELS(32)
351 SHOW_TEXTRELS(64)
352 }
353 if (!*found_textrels)
354 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
355
356 return NULL;
357 }
358
359 static void rpath_security_checks(elfobj *, char *);
360 static void rpath_security_checks(elfobj *elf, char *item) {
361 struct stat st;
362 switch (*item) {
363 case '/': break;
364 case '.':
365 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
366 break;
367 case '\0':
368 warnf("Security problem NULL RPATH in %s", elf->filename);
369 break;
370 case '$':
371 if (fstat(elf->fd, &st) != -1)
372 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
373 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
374 item, elf->filename, st.st_mode & 07777);
375 break;
376 default:
377 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
378 break;
379 }
380 }
381 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
382 {
383 unsigned long i, s;
384 char *rpath, *runpath, **r;
385 void *strtbl_void;
386
387 if (!show_rpath) return;
388
389 strtbl_void = elf_findsecbyname(elf, ".dynstr");
390 rpath = runpath = NULL;
391
392 if (elf->phdr && strtbl_void) {
393 #define SHOW_RPATH(B) \
394 if (elf->elf_class == ELFCLASS ## B) { \
395 Elf ## B ## _Dyn *dyn; \
396 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
397 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
398 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
399 Elf ## B ## _Off offset; \
400 Elf ## B ## _Xword word; \
401 /* Scan all the program headers */ \
402 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
403 /* Just scan dynamic headers */ \
404 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
405 offset = EGET(phdr[i].p_offset); \
406 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
407 /* Just scan dynamic RPATH/RUNPATH headers */ \
408 dyn = DYN ## B (elf->data + offset); \
409 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
410 if (word == DT_RPATH) { \
411 r = &rpath; \
412 } else if (word == DT_RUNPATH) { \
413 r = &runpath; \
414 } else { \
415 ++dyn; \
416 continue; \
417 } \
418 /* Verify the memory is somewhat sane */ \
419 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
420 if (offset < (Elf ## B ## _Off)elf->len) { \
421 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
422 *r = (char*)(elf->data + offset); \
423 /* If quiet, don't output paths in ld.so.conf */ \
424 if (be_quiet) { \
425 size_t len; \
426 char *start, *end; \
427 /* note that we only 'chop' off leading known paths. */ \
428 /* since *r is read-only memory, we can only move the ptr forward. */ \
429 start = *r; \
430 /* scan each path in : delimited list */ \
431 while (start) { \
432 rpath_security_checks(elf, start); \
433 end = strchr(start, ':'); \
434 len = (end ? abs(end - start) : strlen(start)); \
435 for (s = 0; ldpaths[s]; ++s) { \
436 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
437 *r = (end ? end + 1 : NULL); \
438 break; \
439 } \
440 } \
441 if (!*r || !ldpaths[s] || !end) \
442 start = NULL; \
443 else \
444 start = start + len + 1; \
445 } \
446 } \
447 if (*r) *found_rpath = 1; \
448 } \
449 ++dyn; \
450 } \
451 } }
452 SHOW_RPATH(32)
453 SHOW_RPATH(64)
454 }
455
456 if (be_wewy_wewy_quiet) return;
457
458 if (rpath && runpath) {
459 if (!strcmp(rpath, runpath)) {
460 xstrcat(ret, runpath, ret_len);
461 } else {
462 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
463 xchrcat(ret, '{', ret_len);
464 xstrcat(ret, rpath, ret_len);
465 xchrcat(ret, ',', ret_len);
466 xstrcat(ret, runpath, ret_len);
467 xchrcat(ret, '}', ret_len);
468 }
469 } else if (rpath || runpath)
470 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
471 else if (!be_quiet)
472 xstrcat(ret, " - ", ret_len);
473 }
474
475 #define LDSO_CACHE_MAGIC "ld.so-"
476 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
477 #define LDSO_CACHE_VER "1.7.0"
478 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
479 #define FLAG_ANY -1
480 #define FLAG_TYPE_MASK 0x00ff
481 #define FLAG_LIBC4 0x0000
482 #define FLAG_ELF 0x0001
483 #define FLAG_ELF_LIBC5 0x0002
484 #define FLAG_ELF_LIBC6 0x0003
485 #define FLAG_REQUIRED_MASK 0xff00
486 #define FLAG_SPARC_LIB64 0x0100
487 #define FLAG_IA64_LIB64 0x0200
488 #define FLAG_X8664_LIB64 0x0300
489 #define FLAG_S390_LIB64 0x0400
490 #define FLAG_POWERPC_LIB64 0x0500
491 #define FLAG_MIPS64_LIBN32 0x0600
492 #define FLAG_MIPS64_LIBN64 0x0700
493
494 static char *lookup_cache_lib(elfobj *, char *);
495 static char *lookup_cache_lib(elfobj *elf, char *fname)
496 {
497 int fd = 0;
498 char *strs;
499 static char buf[_POSIX_PATH_MAX] = "";
500 const char *cachefile = "/etc/ld.so.cache";
501 struct stat st;
502
503 typedef struct {
504 char magic[LDSO_CACHE_MAGIC_LEN];
505 char version[LDSO_CACHE_VER_LEN];
506 int nlibs;
507 } header_t;
508 header_t *header;
509
510 typedef struct {
511 int flags;
512 int sooffset;
513 int liboffset;
514 } libentry_t;
515 libentry_t *libent;
516
517 if (fname == NULL)
518 return NULL;
519
520 if (ldcache == 0) {
521 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
522 return NULL;
523
524 /* cache these values so we only map/unmap the cache file once */
525 ldcache_size = st.st_size;
526 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
527
528 close(fd);
529
530 if (ldcache == (caddr_t)-1)
531 return NULL;
532
533 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
534 return NULL;
535 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
536 return NULL;
537 }
538
539 header = (header_t *) ldcache;
540 libent = (libentry_t *) (ldcache + sizeof(header_t));
541 strs = (char *) &libent[header->nlibs];
542
543 for (fd = 0; fd < header->nlibs; fd++) {
544 /* this should be more fine grained, but for now we assume that
545 * diff arches will not be cached together. and we ignore the
546 * the different multilib mips cases. */
547 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
548 continue;
549 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
550 continue;
551
552 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
553 continue;
554 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
555 }
556 return buf;
557 }
558
559
560 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
561 {
562 unsigned long i;
563 char *needed;
564 void *strtbl_void;
565 char *p;
566
567 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
568
569 strtbl_void = elf_findsecbyname(elf, ".dynstr");
570
571 if (elf->phdr && strtbl_void) {
572 #define SHOW_NEEDED(B) \
573 if (elf->elf_class == ELFCLASS ## B) { \
574 Elf ## B ## _Dyn *dyn; \
575 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
576 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
577 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
578 Elf ## B ## _Off offset; \
579 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
580 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
581 offset = EGET(phdr[i].p_offset); \
582 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
583 dyn = DYN ## B (elf->data + offset); \
584 while (EGET(dyn->d_tag) != DT_NULL) { \
585 if (EGET(dyn->d_tag) == DT_NEEDED) { \
586 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
587 if (offset >= (Elf ## B ## _Off)elf->len) { \
588 ++dyn; \
589 continue; \
590 } \
591 needed = (char*)(elf->data + offset); \
592 if (op == 0) { \
593 if (!be_wewy_wewy_quiet) { \
594 if (*found_needed) xchrcat(ret, ',', ret_len); \
595 if (printcache) \
596 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
597 needed = p; \
598 xstrcat(ret, needed, ret_len); \
599 } \
600 *found_needed = 1; \
601 } else { \
602 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
603 *found_lib = 1; \
604 return (be_wewy_wewy_quiet ? NULL : needed); \
605 } \
606 } \
607 } \
608 ++dyn; \
609 } \
610 } }
611 SHOW_NEEDED(32)
612 SHOW_NEEDED(64)
613 if (op == 0 && !*found_needed && be_verbose)
614 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
615 }
616
617 return NULL;
618 }
619 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
620 {
621 void *strtbl_void;
622
623 if (!show_interp) return NULL;
624
625 strtbl_void = elf_findsecbyname(elf, ".interp");
626
627 if (strtbl_void) {
628 #define SHOW_INTERP(B) \
629 if (elf->elf_class == ELFCLASS ## B) { \
630 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
631 *found_interp = 1; \
632 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
633 }
634 SHOW_INTERP(32)
635 SHOW_INTERP(64)
636 }
637 return NULL;
638 }
639 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
640 {
641 unsigned long i;
642 struct stat s;
643
644 if (!show_bind) return NULL;
645 if (!elf->phdr) return NULL;
646
647 #define SHOW_BIND(B) \
648 if (elf->elf_class == ELFCLASS ## B) { \
649 Elf ## B ## _Dyn *dyn; \
650 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
651 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
652 Elf ## B ## _Off offset; \
653 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
654 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
655 offset = EGET(phdr[i].p_offset); \
656 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
657 dyn = DYN ## B (elf->data + offset); \
658 while (EGET(dyn->d_tag) != DT_NULL) { \
659 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
660 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
661 { \
662 if (be_quiet) return NULL; \
663 *found_bind = 1; \
664 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
665 } \
666 ++dyn; \
667 } \
668 } \
669 }
670 SHOW_BIND(32)
671 SHOW_BIND(64)
672
673 if (be_wewy_wewy_quiet) return NULL;
674
675 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
676 return NULL;
677 } else {
678 *found_bind = 1;
679 return (char *) "LAZY";
680 }
681 }
682 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
683 {
684 unsigned long i;
685 char *soname;
686 void *strtbl_void;
687
688 if (!show_soname) return NULL;
689
690 strtbl_void = elf_findsecbyname(elf, ".dynstr");
691
692 if (elf->phdr && strtbl_void) {
693 #define SHOW_SONAME(B) \
694 if (elf->elf_class == ELFCLASS ## B) { \
695 Elf ## B ## _Dyn *dyn; \
696 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
697 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
698 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
699 Elf ## B ## _Off offset; \
700 /* only look for soname in shared objects */ \
701 if (ehdr->e_type != ET_DYN) \
702 return NULL; \
703 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
704 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
705 offset = EGET(phdr[i].p_offset); \
706 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
707 dyn = DYN ## B (elf->data + offset); \
708 while (EGET(dyn->d_tag) != DT_NULL) { \
709 if (EGET(dyn->d_tag) == DT_SONAME) { \
710 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
711 if (offset >= (Elf ## B ## _Off)elf->len) { \
712 ++dyn; \
713 continue; \
714 } \
715 soname = (char*)(elf->data + offset); \
716 *found_soname = 1; \
717 return (be_wewy_wewy_quiet ? NULL : soname); \
718 } \
719 ++dyn; \
720 } \
721 } }
722 SHOW_SONAME(32)
723 SHOW_SONAME(64)
724 }
725
726 return NULL;
727 }
728 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
729 {
730 unsigned long i;
731 char *ret;
732 void *symtab_void, *strtab_void;
733
734 if (!find_sym) return NULL;
735 ret = find_sym;
736
737 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
738
739 if (symtab_void && strtab_void) {
740 #define FIND_SYM(B) \
741 if (elf->elf_class == ELFCLASS ## B) { \
742 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
743 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
744 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
745 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
746 char *symname; \
747 for (i = 0; i < cnt; ++i) { \
748 if (sym->st_name) { \
749 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
750 if (*find_sym == '*') { \
751 printf("%s(%s) %5lX %15s %s\n", \
752 ((*found_sym == 0) ? "\n\t" : "\t"), \
753 elf->base_filename, \
754 (unsigned long)sym->st_size, \
755 get_elfstttype(sym->st_info), \
756 symname); \
757 *found_sym = 1; \
758 } else { \
759 char *this_sym, *next_sym; \
760 this_sym = find_sym; \
761 do { \
762 next_sym = strchr(this_sym, ','); \
763 if (next_sym == NULL) \
764 next_sym = this_sym + strlen(this_sym); \
765 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
766 (strcmp(symname, versioned_symname) == 0)) { \
767 ret = this_sym; \
768 (*found_sym)++; \
769 goto break_out; \
770 } \
771 this_sym = next_sym + 1; \
772 } while (*next_sym != '\0'); \
773 } \
774 } \
775 ++sym; \
776 } }
777 FIND_SYM(32)
778 FIND_SYM(64)
779 }
780
781 break_out:
782 if (be_wewy_wewy_quiet) return NULL;
783
784 if (*find_sym != '*' && *found_sym)
785 return ret;
786 if (be_quiet)
787 return NULL;
788 else
789 return (char *)" - ";
790 }
791 /* scan an elf file and show all the fun stuff */
792 #define prints(str) write(fileno(stdout), str, strlen(str))
793 static void scanelf_file(const char *filename)
794 {
795 unsigned long i;
796 char found_pax, found_phdr, found_relro, found_load, found_textrel,
797 found_rpath, found_needed, found_interp, found_bind, found_soname,
798 found_sym, found_lib, found_file, found_textrels;
799 elfobj *elf;
800 struct stat st;
801 static char *out_buffer = NULL;
802 static size_t out_len;
803
804 /* make sure 'filename' exists */
805 if (lstat(filename, &st) == -1) {
806 if (be_verbose > 2) printf("%s: does not exist\n", filename);
807 return;
808 }
809 /* always handle regular files and handle symlinked files if no -y */
810 if (S_ISLNK(st.st_mode)) {
811 if (!scan_symlink) return;
812 stat(filename, &st);
813 }
814 if (!S_ISREG(st.st_mode)) {
815 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
816 return;
817 }
818
819 found_pax = found_phdr = found_relro = found_load = found_textrel = \
820 found_rpath = found_needed = found_interp = found_bind = found_soname = \
821 found_sym = found_lib = found_file = found_textrels = 0;
822
823 /* verify this is real ELF */
824 if ((elf = readelf(filename)) == NULL) {
825 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
826 return;
827 }
828
829 if (be_verbose > 1)
830 printf("%s: scanning file {%s,%s}\n", filename,
831 get_elfeitype(EI_CLASS, elf->elf_class),
832 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
833 else if (be_verbose)
834 printf("%s: scanning file\n", filename);
835
836 /* init output buffer */
837 if (!out_buffer) {
838 out_len = sizeof(char) * 80;
839 out_buffer = (char*)xmalloc(out_len);
840 }
841 *out_buffer = '\0';
842
843 /* show the header */
844 if (!be_quiet && show_banner) {
845 for (i = 0; out_format[i]; ++i) {
846 if (!IS_MODIFIER(out_format[i])) continue;
847
848 switch (out_format[++i]) {
849 case '%': break;
850 case '#': break;
851 case 'F':
852 case 'p':
853 case 'f': prints("FILE "); found_file = 1; break;
854 case 'o': prints(" TYPE "); break;
855 case 'x': prints(" PAX "); break;
856 case 'e': prints("STK/REL/PTL "); break;
857 case 't': prints("TEXTREL "); break;
858 case 'r': prints("RPATH "); break;
859 case 'n': prints("NEEDED "); break;
860 case 'i': prints("INTERP "); break;
861 case 'b': prints("BIND "); break;
862 case 'S': prints("SONAME "); break;
863 case 's': prints("SYM "); break;
864 case 'N': prints("LIB "); break;
865 case 'T': prints("TEXTRELS "); break;
866 default: warnf("'%c' has no title ?", out_format[i]);
867 }
868 }
869 if (!found_file) prints("FILE ");
870 prints("\n");
871 found_file = 0;
872 show_banner = 0;
873 }
874
875 /* dump all the good stuff */
876 for (i = 0; out_format[i]; ++i) {
877 const char *out;
878 const char *tmp;
879
880 /* make sure we trim leading spaces in quiet mode */
881 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
882 *out_buffer = '\0';
883
884 if (!IS_MODIFIER(out_format[i])) {
885 xchrcat(&out_buffer, out_format[i], &out_len);
886 continue;
887 }
888
889 out = NULL;
890 be_wewy_wewy_quiet = (out_format[i] == '#');
891 switch (out_format[++i]) {
892 case '%':
893 case '#':
894 xchrcat(&out_buffer, out_format[i], &out_len); break;
895 case 'F':
896 found_file = 1;
897 if (be_wewy_wewy_quiet) break;
898 xstrcat(&out_buffer, filename, &out_len);
899 break;
900 case 'p':
901 found_file = 1;
902 if (be_wewy_wewy_quiet) break;
903 tmp = filename;
904 if (search_path) {
905 ssize_t len_search = strlen(search_path);
906 ssize_t len_file = strlen(filename);
907 if (!strncmp(filename, search_path, len_search) && \
908 len_file > len_search)
909 tmp += len_search;
910 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
911 }
912 xstrcat(&out_buffer, tmp, &out_len);
913 break;
914 case 'f':
915 found_file = 1;
916 if (be_wewy_wewy_quiet) break;
917 tmp = strrchr(filename, '/');
918 tmp = (tmp == NULL ? filename : tmp+1);
919 xstrcat(&out_buffer, tmp, &out_len);
920 break;
921 case 'o': out = get_elfetype(elf); break;
922 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
923 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
924 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
925 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
926 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
927 case 'n':
928 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
929 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
930 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
931 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
932 case 's': out = scanelf_file_sym(elf, &found_sym); break;
933 default: warnf("'%c' has no scan code?", out_format[i]);
934 }
935 if (out) {
936 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
937 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
938 xstrncat(&out_buffer, out, &out_len, (tmp-out));
939 else
940 xstrcat(&out_buffer, out, &out_len);
941 }
942 }
943
944 #define FOUND_SOMETHING() \
945 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
946 found_rpath || found_needed || found_interp || found_bind || \
947 found_soname || found_sym || found_lib || found_textrels)
948
949 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
950 xchrcat(&out_buffer, ' ', &out_len);
951 xstrcat(&out_buffer, filename, &out_len);
952 }
953 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
954 puts(out_buffer);
955 fflush(stdout);
956 }
957
958 unreadelf(elf);
959 }
960
961 /* scan a directory for ET_EXEC files and print when we find one */
962 static void scanelf_dir(const char *path)
963 {
964 register DIR *dir;
965 register struct dirent *dentry;
966 struct stat st_top, st;
967 char buf[_POSIX_PATH_MAX];
968 size_t pathlen = 0, len = 0;
969
970 /* make sure path exists */
971 if (lstat(path, &st_top) == -1) {
972 if (be_verbose > 2) printf("%s: does not exist\n", path);
973 return;
974 }
975
976 /* ok, if it isn't a directory, assume we can open it */
977 if (!S_ISDIR(st_top.st_mode)) {
978 scanelf_file(path);
979 return;
980 }
981
982 /* now scan the dir looking for fun stuff */
983 if ((dir = opendir(path)) == NULL) {
984 warnf("could not opendir %s: %s", path, strerror(errno));
985 return;
986 }
987 if (be_verbose) printf("%s: scanning dir\n", path);
988
989 pathlen = strlen(path);
990 while ((dentry = readdir(dir))) {
991 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
992 continue;
993 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
994 if (len >= sizeof(buf)) {
995 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
996 (unsigned long)len, (unsigned long)sizeof(buf));
997 continue;
998 }
999 sprintf(buf, "%s/%s", path, dentry->d_name);
1000 if (lstat(buf, &st) != -1) {
1001 if (S_ISREG(st.st_mode))
1002 scanelf_file(buf);
1003 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1004 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1005 scanelf_dir(buf);
1006 }
1007 }
1008 }
1009 closedir(dir);
1010 }
1011
1012 static int scanelf_from_file(char *filename)
1013 {
1014 FILE *fp = NULL;
1015 char *p;
1016 char path[_POSIX_PATH_MAX];
1017
1018 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1019 fp = stdin;
1020 else if ((fp = fopen(filename, "r")) == NULL)
1021 return 1;
1022
1023 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1024 if ((p = strchr(path, '\n')) != NULL)
1025 *p = 0;
1026 search_path = path;
1027 scanelf_dir(path);
1028 }
1029 if (fp != stdin)
1030 fclose(fp);
1031 return 0;
1032 }
1033
1034 static void load_ld_so_conf()
1035 {
1036 FILE *fp = NULL;
1037 char *p;
1038 char path[_POSIX_PATH_MAX];
1039 int i = 0;
1040
1041 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1042 return;
1043
1044 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1045 if (*path != '/')
1046 continue;
1047
1048 if ((p = strrchr(path, '\r')) != NULL)
1049 *p = 0;
1050 if ((p = strchr(path, '\n')) != NULL)
1051 *p = 0;
1052
1053 ldpaths[i++] = xstrdup(path);
1054
1055 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1056 break;
1057 }
1058 ldpaths[i] = NULL;
1059
1060 fclose(fp);
1061 }
1062
1063 /* scan /etc/ld.so.conf for paths */
1064 static void scanelf_ldpath()
1065 {
1066 char scan_l, scan_ul, scan_ull;
1067 int i = 0;
1068
1069 if (!ldpaths[0])
1070 err("Unable to load any paths from ld.so.conf");
1071
1072 scan_l = scan_ul = scan_ull = 0;
1073
1074 while (ldpaths[i]) {
1075 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1076 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1077 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1078 scanelf_dir(ldpaths[i]);
1079 ++i;
1080 }
1081
1082 if (!scan_l) scanelf_dir("/lib");
1083 if (!scan_ul) scanelf_dir("/usr/lib");
1084 if (!scan_ull) scanelf_dir("/usr/local/lib");
1085 }
1086
1087 /* scan env PATH for paths */
1088 static void scanelf_envpath()
1089 {
1090 char *path, *p;
1091
1092 path = getenv("PATH");
1093 if (!path)
1094 err("PATH is not set in your env !");
1095 path = xstrdup(path);
1096
1097 while ((p = strrchr(path, ':')) != NULL) {
1098 scanelf_dir(p + 1);
1099 *p = 0;
1100 }
1101
1102 free(path);
1103 }
1104
1105
1106 /* usage / invocation handling functions */
1107 #define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV"
1108 #define a_argument required_argument
1109 static struct option const long_opts[] = {
1110 {"path", no_argument, NULL, 'p'},
1111 {"ldpath", no_argument, NULL, 'l'},
1112 {"recursive", no_argument, NULL, 'R'},
1113 {"mount", no_argument, NULL, 'm'},
1114 {"symlink", no_argument, NULL, 'y'},
1115 {"pax", no_argument, NULL, 'x'},
1116 {"header", no_argument, NULL, 'e'},
1117 {"textrel", no_argument, NULL, 't'},
1118 {"rpath", no_argument, NULL, 'r'},
1119 {"needed", no_argument, NULL, 'n'},
1120 {"ldcache", no_argument, NULL, 'L'},
1121 {"interp", no_argument, NULL, 'i'},
1122 {"bind", no_argument, NULL, 'b'},
1123 {"soname", no_argument, NULL, 'S'},
1124 {"symbol", a_argument, NULL, 's'},
1125 {"lib", a_argument, NULL, 'N'},
1126 {"gmatch", no_argument, NULL, 'g'},
1127 {"textrels", no_argument, NULL, 'T'},
1128 {"all", no_argument, NULL, 'a'},
1129 {"quiet", no_argument, NULL, 'q'},
1130 {"verbose", no_argument, NULL, 'v'},
1131 {"format", a_argument, NULL, 'F'},
1132 {"from", a_argument, NULL, 'f'},
1133 {"file", a_argument, NULL, 'o'},
1134 {"nobanner", no_argument, NULL, 'B'},
1135 {"help", no_argument, NULL, 'h'},
1136 {"version", no_argument, NULL, 'V'},
1137 {NULL, no_argument, NULL, 0x0}
1138 };
1139
1140 static const char *opts_help[] = {
1141 "Scan all directories in PATH environment",
1142 "Scan all directories in /etc/ld.so.conf",
1143 "Scan directories recursively",
1144 "Don't recursively cross mount points",
1145 "Don't scan symlinks\n",
1146 "Print PaX markings",
1147 "Print GNU_STACK/PT_LOAD markings",
1148 "Print TEXTREL information",
1149 "Print RPATH information",
1150 "Print NEEDED information",
1151 "Resolve NEEDED information (use with -n)",
1152 "Print INTERP information",
1153 "Print BIND information",
1154 "Print SONAME information",
1155 "Find a specified symbol",
1156 "Find a specified library",
1157 "Use strncmp to match libraries. (use with -N)",
1158 "Locate cause of TEXTREL",
1159 "Print all scanned info (-x -e -t -r -b)\n",
1160 "Only output 'bad' things",
1161 "Be verbose (can be specified more than once)",
1162 "Use specified format for output",
1163 "Read input stream from a filename",
1164 "Write output stream to a filename",
1165 "Don't display the header",
1166 "Print this help and exit",
1167 "Print version and exit",
1168 NULL
1169 };
1170
1171 /* display usage and exit */
1172 static void usage(int status)
1173 {
1174 unsigned long i;
1175 printf("* Scan ELF binaries for stuff\n\n"
1176 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1177 printf("Options: -[%s]\n", PARSE_FLAGS);
1178 for (i = 0; long_opts[i].name; ++i)
1179 if (long_opts[i].has_arg == no_argument)
1180 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1181 long_opts[i].name, opts_help[i]);
1182 else
1183 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1184 long_opts[i].name, opts_help[i]);
1185
1186 if (status != EXIT_SUCCESS)
1187 exit(status);
1188
1189 puts("\nThe format modifiers for the -F option are:");
1190 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1191 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1192 puts(" i INTERP \tb BIND \ts symbol");
1193 puts(" N library \to Type \tT TEXTRELs");
1194 puts(" S SONAME");
1195 puts(" p filename (with search path removed)");
1196 puts(" f filename (short name/basename)");
1197 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1198
1199 exit(status);
1200 }
1201
1202 /* parse command line arguments and preform needed actions */
1203 static void parseargs(int argc, char *argv[])
1204 {
1205 int i;
1206 char *from_file = NULL;
1207
1208 opterr = 0;
1209 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1210 switch (i) {
1211
1212 case 'V':
1213 printf("pax-utils-%s: %s compiled %s\n%s\n"
1214 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1215 VERSION, __FILE__, __DATE__, rcsid, argv0);
1216 exit(EXIT_SUCCESS);
1217 break;
1218 case 'h': usage(EXIT_SUCCESS); break;
1219 case 'f':
1220 if (from_file) err("Don't specify -f twice");
1221 from_file = xstrdup(optarg);
1222 break;
1223 case 'o': {
1224 FILE *fp = NULL;
1225 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1226 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1227 SET_STDOUT(fp);
1228 break;
1229 }
1230
1231 case 's': {
1232 if (find_sym) warn("You prob don't want to specify -s twice");
1233 find_sym = optarg;
1234 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1235 sprintf(versioned_symname, "%s@", find_sym);
1236 break;
1237 }
1238 case 'N': {
1239 if (find_lib) warn("You prob don't want to specify -N twice");
1240 find_lib = optarg;
1241 break;
1242 }
1243
1244 case 'F': {
1245 if (out_format) warn("You prob don't want to specify -F twice");
1246 out_format = optarg;
1247 break;
1248 }
1249
1250 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1251 case 'L': printcache = 1; break;
1252 case 'y': scan_symlink = 0; break;
1253 case 'B': show_banner = 0; break;
1254 case 'l': scan_ldpath = 1; break;
1255 case 'p': scan_envpath = 1; break;
1256 case 'R': dir_recurse = 1; break;
1257 case 'm': dir_crossmount = 0; break;
1258 case 'x': show_pax = 1; break;
1259 case 'e': show_phdr = 1; break;
1260 case 't': show_textrel = 1; break;
1261 case 'r': show_rpath = 1; break;
1262 case 'n': show_needed = 1; break;
1263 case 'i': show_interp = 1; break;
1264 case 'b': show_bind = 1; break;
1265 case 'S': show_soname = 1; break;
1266 case 'T': show_textrels = 1; break;
1267 case 'q': be_quiet = 1; break;
1268 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1269 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1270
1271 case ':':
1272 err("Option missing parameter\n");
1273 case '?':
1274 err("Unknown option\n");
1275 default:
1276 err("Unhandled option '%c'", i);
1277 }
1278 }
1279
1280 /* let the format option override all other options */
1281 if (out_format) {
1282 show_pax = show_phdr = show_textrel = show_rpath = \
1283 show_needed = show_interp = show_bind = show_soname = \
1284 show_textrels = 0;
1285 for (i = 0; out_format[i]; ++i) {
1286 if (!IS_MODIFIER(out_format[i])) continue;
1287
1288 switch (out_format[++i]) {
1289 case '%': break;
1290 case '#': break;
1291 case 'F': break;
1292 case 'p': break;
1293 case 'f': break;
1294 case 's': break;
1295 case 'N': break;
1296 case 'o': break;
1297 case 'x': show_pax = 1; break;
1298 case 'e': show_phdr = 1; break;
1299 case 't': show_textrel = 1; break;
1300 case 'r': show_rpath = 1; break;
1301 case 'n': show_needed = 1; break;
1302 case 'i': show_interp = 1; break;
1303 case 'b': show_bind = 1; break;
1304 case 'S': show_soname = 1; break;
1305 case 'T': show_textrels = 1; break;
1306 default:
1307 err("Invalid format specifier '%c' (byte %i)",
1308 out_format[i], i+1);
1309 }
1310 }
1311
1312 /* construct our default format */
1313 } else {
1314 size_t fmt_len = 30;
1315 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1316 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1317 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1318 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1319 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1320 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1321 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1322 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1323 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1324 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1325 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1326 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1327 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1328 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1329 }
1330 if (be_verbose > 2) printf("Format: %s\n", out_format);
1331
1332 /* now lets actually do the scanning */
1333 if (scan_ldpath || (show_rpath && be_quiet))
1334 load_ld_so_conf();
1335 if (scan_ldpath) scanelf_ldpath();
1336 if (scan_envpath) scanelf_envpath();
1337 if (from_file) {
1338 scanelf_from_file(from_file);
1339 free(from_file);
1340 from_file = *argv;
1341 }
1342 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1343 err("Nothing to scan !?");
1344 while (optind < argc) {
1345 search_path = argv[optind++];
1346 scanelf_dir(search_path);
1347 }
1348
1349 /* clean up */
1350 if (versioned_symname) free(versioned_symname);
1351 for (i = 0; ldpaths[i]; ++i)
1352 free(ldpaths[i]);
1353
1354 if (ldcache != 0)
1355 munmap(ldcache, ldcache_size);
1356 }
1357
1358
1359
1360 /* utility funcs */
1361 static char *xstrdup(const char *s)
1362 {
1363 char *ret = strdup(s);
1364 if (!ret) err("Could not strdup(): %s", strerror(errno));
1365 return ret;
1366 }
1367 static void *xmalloc(size_t size)
1368 {
1369 void *ret = malloc(size);
1370 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1371 return ret;
1372 }
1373 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1374 {
1375 size_t new_len;
1376
1377 new_len = strlen(*dst) + strlen(src);
1378 if (*curr_len <= new_len) {
1379 *curr_len = new_len + (*curr_len / 2);
1380 *dst = realloc(*dst, *curr_len);
1381 if (!*dst)
1382 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1383 }
1384
1385 if (n)
1386 strncat(*dst, src, n);
1387 else
1388 strcat(*dst, src);
1389 }
1390 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1391 {
1392 static char my_app[2];
1393 my_app[0] = append;
1394 my_app[1] = '\0';
1395 xstrcat(dst, my_app, curr_len);
1396 }
1397
1398
1399
1400 int main(int argc, char *argv[])
1401 {
1402 if (argc < 2)
1403 usage(EXIT_FAILURE);
1404 parseargs(argc, argv);
1405 fclose(stdout);
1406 #ifdef __BOUNDS_CHECKING_ON
1407 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1408 #endif
1409 return EXIT_SUCCESS;
1410 }

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