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Revision 1.99 - (show annotations) (download) (as text)
Tue Jan 10 01:35:06 2006 UTC (9 years, 3 months ago) by vapier
Branch: MAIN
Changes since 1.98: +6 -5 lines
File MIME type: text/x-csrc
split the pt_load check out into a sep func for easier managing in the future and to shut up openbsd

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 1.98 2006/01/05 03:12:07 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 1.98 2006/01/05 03:12:07 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 struct stat st;
363 switch (*item) {
364 case '/': break;
365 case '.':
366 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
367 break;
368 case '\0':
369 warnf("Security problem NULL RPATH in %s", elf->filename);
370 break;
371 case '$':
372 if (fstat(elf->fd, &st) != -1)
373 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
374 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
375 item, elf->filename, st.st_mode & 07777);
376 break;
377 default:
378 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
379 break;
380 }
381 }
382 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
383 {
384 unsigned long i, s;
385 char *rpath, *runpath, **r;
386 void *strtbl_void;
387
388 if (!show_rpath) return;
389
390 strtbl_void = elf_findsecbyname(elf, ".dynstr");
391 rpath = runpath = NULL;
392
393 if (elf->phdr && strtbl_void) {
394 #define SHOW_RPATH(B) \
395 if (elf->elf_class == ELFCLASS ## B) { \
396 Elf ## B ## _Dyn *dyn; \
397 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
398 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
399 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
400 Elf ## B ## _Off offset; \
401 Elf ## B ## _Xword word; \
402 /* Scan all the program headers */ \
403 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
404 /* Just scan dynamic headers */ \
405 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
406 offset = EGET(phdr[i].p_offset); \
407 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
408 /* Just scan dynamic RPATH/RUNPATH headers */ \
409 dyn = DYN ## B (elf->data + offset); \
410 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
411 if (word == DT_RPATH) { \
412 r = &rpath; \
413 } else if (word == DT_RUNPATH) { \
414 r = &runpath; \
415 } else { \
416 ++dyn; \
417 continue; \
418 } \
419 /* Verify the memory is somewhat sane */ \
420 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
421 if (offset < (Elf ## B ## _Off)elf->len) { \
422 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
423 *r = (char*)(elf->data + offset); \
424 /* If quiet, don't output paths in ld.so.conf */ \
425 if (be_quiet) { \
426 size_t len; \
427 char *start, *end; \
428 /* note that we only 'chop' off leading known paths. */ \
429 /* since *r is read-only memory, we can only move the ptr forward. */ \
430 start = *r; \
431 /* scan each path in : delimited list */ \
432 while (start) { \
433 rpath_security_checks(elf, start); \
434 end = strchr(start, ':'); \
435 len = (end ? abs(end - start) : strlen(start)); \
436 for (s = 0; ldpaths[s]; ++s) { \
437 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
438 *r = (end ? end + 1 : NULL); \
439 break; \
440 } \
441 } \
442 if (!*r || !ldpaths[s] || !end) \
443 start = NULL; \
444 else \
445 start = start + len + 1; \
446 } \
447 } \
448 if (*r) *found_rpath = 1; \
449 } \
450 ++dyn; \
451 } \
452 } }
453 SHOW_RPATH(32)
454 SHOW_RPATH(64)
455 }
456
457 if (be_wewy_wewy_quiet) return;
458
459 if (rpath && runpath) {
460 if (!strcmp(rpath, runpath)) {
461 xstrcat(ret, runpath, ret_len);
462 } else {
463 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
464 xchrcat(ret, '{', ret_len);
465 xstrcat(ret, rpath, ret_len);
466 xchrcat(ret, ',', ret_len);
467 xstrcat(ret, runpath, ret_len);
468 xchrcat(ret, '}', ret_len);
469 }
470 } else if (rpath || runpath)
471 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
472 else if (!be_quiet)
473 xstrcat(ret, " - ", ret_len);
474 }
475
476 #define LDSO_CACHE_MAGIC "ld.so-"
477 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
478 #define LDSO_CACHE_VER "1.7.0"
479 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
480 #define FLAG_ANY -1
481 #define FLAG_TYPE_MASK 0x00ff
482 #define FLAG_LIBC4 0x0000
483 #define FLAG_ELF 0x0001
484 #define FLAG_ELF_LIBC5 0x0002
485 #define FLAG_ELF_LIBC6 0x0003
486 #define FLAG_REQUIRED_MASK 0xff00
487 #define FLAG_SPARC_LIB64 0x0100
488 #define FLAG_IA64_LIB64 0x0200
489 #define FLAG_X8664_LIB64 0x0300
490 #define FLAG_S390_LIB64 0x0400
491 #define FLAG_POWERPC_LIB64 0x0500
492 #define FLAG_MIPS64_LIBN32 0x0600
493 #define FLAG_MIPS64_LIBN64 0x0700
494
495 static char *lookup_cache_lib(elfobj *, char *);
496 static char *lookup_cache_lib(elfobj *elf, char *fname)
497 {
498 int fd = 0;
499 char *strs;
500 static char buf[_POSIX_PATH_MAX] = "";
501 const char *cachefile = "/etc/ld.so.cache";
502 struct stat st;
503
504 typedef struct {
505 char magic[LDSO_CACHE_MAGIC_LEN];
506 char version[LDSO_CACHE_VER_LEN];
507 int nlibs;
508 } header_t;
509 header_t *header;
510
511 typedef struct {
512 int flags;
513 int sooffset;
514 int liboffset;
515 } libentry_t;
516 libentry_t *libent;
517
518 if (fname == NULL)
519 return NULL;
520
521 if (ldcache == 0) {
522 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
523 return NULL;
524
525 /* cache these values so we only map/unmap the cache file once */
526 ldcache_size = st.st_size;
527 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
528
529 close(fd);
530
531 if (ldcache == (caddr_t)-1)
532 return NULL;
533
534 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
535 return NULL;
536 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
537 return NULL;
538 }
539
540 header = (header_t *) ldcache;
541 libent = (libentry_t *) (ldcache + sizeof(header_t));
542 strs = (char *) &libent[header->nlibs];
543
544 for (fd = 0; fd < header->nlibs; fd++) {
545 /* this should be more fine grained, but for now we assume that
546 * diff arches will not be cached together. and we ignore the
547 * the different multilib mips cases. */
548 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
549 continue;
550 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
551 continue;
552
553 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
554 continue;
555 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
556 }
557 return buf;
558 }
559
560
561 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
562 {
563 unsigned long i;
564 char *needed;
565 void *strtbl_void;
566 char *p;
567
568 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
569
570 strtbl_void = elf_findsecbyname(elf, ".dynstr");
571
572 if (elf->phdr && strtbl_void) {
573 #define SHOW_NEEDED(B) \
574 if (elf->elf_class == ELFCLASS ## B) { \
575 Elf ## B ## _Dyn *dyn; \
576 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
577 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
578 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
579 Elf ## B ## _Off offset; \
580 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
581 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
582 offset = EGET(phdr[i].p_offset); \
583 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
584 dyn = DYN ## B (elf->data + offset); \
585 while (EGET(dyn->d_tag) != DT_NULL) { \
586 if (EGET(dyn->d_tag) == DT_NEEDED) { \
587 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
588 if (offset >= (Elf ## B ## _Off)elf->len) { \
589 ++dyn; \
590 continue; \
591 } \
592 needed = (char*)(elf->data + offset); \
593 if (op == 0) { \
594 if (!be_wewy_wewy_quiet) { \
595 if (*found_needed) xchrcat(ret, ',', ret_len); \
596 if (printcache) \
597 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
598 needed = p; \
599 xstrcat(ret, needed, ret_len); \
600 } \
601 *found_needed = 1; \
602 } else { \
603 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
604 *found_lib = 1; \
605 return (be_wewy_wewy_quiet ? NULL : needed); \
606 } \
607 } \
608 } \
609 ++dyn; \
610 } \
611 } }
612 SHOW_NEEDED(32)
613 SHOW_NEEDED(64)
614 if (op == 0 && !*found_needed && be_verbose)
615 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
616 }
617
618 return NULL;
619 }
620 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
621 {
622 void *strtbl_void;
623
624 if (!show_interp) return NULL;
625
626 strtbl_void = elf_findsecbyname(elf, ".interp");
627
628 if (strtbl_void) {
629 #define SHOW_INTERP(B) \
630 if (elf->elf_class == ELFCLASS ## B) { \
631 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
632 *found_interp = 1; \
633 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
634 }
635 SHOW_INTERP(32)
636 SHOW_INTERP(64)
637 }
638 return NULL;
639 }
640 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
641 {
642 unsigned long i;
643 struct stat s;
644
645 if (!show_bind) return NULL;
646 if (!elf->phdr) return NULL;
647
648 #define SHOW_BIND(B) \
649 if (elf->elf_class == ELFCLASS ## B) { \
650 Elf ## B ## _Dyn *dyn; \
651 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
652 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
653 Elf ## B ## _Off offset; \
654 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
655 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
656 offset = EGET(phdr[i].p_offset); \
657 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
658 dyn = DYN ## B (elf->data + offset); \
659 while (EGET(dyn->d_tag) != DT_NULL) { \
660 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
661 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
662 { \
663 if (be_quiet) return NULL; \
664 *found_bind = 1; \
665 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
666 } \
667 ++dyn; \
668 } \
669 } \
670 }
671 SHOW_BIND(32)
672 SHOW_BIND(64)
673
674 if (be_wewy_wewy_quiet) return NULL;
675
676 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
677 return NULL;
678 } else {
679 *found_bind = 1;
680 return (char *) "LAZY";
681 }
682 }
683 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
684 {
685 unsigned long i;
686 char *soname;
687 void *strtbl_void;
688
689 if (!show_soname) return NULL;
690
691 strtbl_void = elf_findsecbyname(elf, ".dynstr");
692
693 if (elf->phdr && strtbl_void) {
694 #define SHOW_SONAME(B) \
695 if (elf->elf_class == ELFCLASS ## B) { \
696 Elf ## B ## _Dyn *dyn; \
697 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
698 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
699 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
700 Elf ## B ## _Off offset; \
701 /* only look for soname in shared objects */ \
702 if (ehdr->e_type != ET_DYN) \
703 return NULL; \
704 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
705 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
706 offset = EGET(phdr[i].p_offset); \
707 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
708 dyn = DYN ## B (elf->data + offset); \
709 while (EGET(dyn->d_tag) != DT_NULL) { \
710 if (EGET(dyn->d_tag) == DT_SONAME) { \
711 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
712 if (offset >= (Elf ## B ## _Off)elf->len) { \
713 ++dyn; \
714 continue; \
715 } \
716 soname = (char*)(elf->data + offset); \
717 *found_soname = 1; \
718 return (be_wewy_wewy_quiet ? NULL : soname); \
719 } \
720 ++dyn; \
721 } \
722 } }
723 SHOW_SONAME(32)
724 SHOW_SONAME(64)
725 }
726
727 return NULL;
728 }
729 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
730 {
731 unsigned long i;
732 char *ret;
733 void *symtab_void, *strtab_void;
734
735 if (!find_sym) return NULL;
736 ret = find_sym;
737
738 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
739
740 if (symtab_void && strtab_void) {
741 #define FIND_SYM(B) \
742 if (elf->elf_class == ELFCLASS ## B) { \
743 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
744 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
745 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
746 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
747 char *symname; \
748 for (i = 0; i < cnt; ++i) { \
749 if (sym->st_name) { \
750 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
751 if (*find_sym == '*') { \
752 printf("%s(%s) %5lX %15s %s\n", \
753 ((*found_sym == 0) ? "\n\t" : "\t"), \
754 elf->base_filename, \
755 (unsigned long)sym->st_size, \
756 get_elfstttype(sym->st_info), \
757 symname); \
758 *found_sym = 1; \
759 } else { \
760 char *this_sym, *next_sym; \
761 this_sym = find_sym; \
762 do { \
763 next_sym = strchr(this_sym, ','); \
764 if (next_sym == NULL) \
765 next_sym = this_sym + strlen(this_sym); \
766 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
767 (strcmp(symname, versioned_symname) == 0)) { \
768 ret = this_sym; \
769 (*found_sym)++; \
770 goto break_out; \
771 } \
772 this_sym = next_sym + 1; \
773 } while (*next_sym != '\0'); \
774 } \
775 } \
776 ++sym; \
777 } }
778 FIND_SYM(32)
779 FIND_SYM(64)
780 }
781
782 break_out:
783 if (be_wewy_wewy_quiet) return NULL;
784
785 if (*find_sym != '*' && *found_sym)
786 return ret;
787 if (be_quiet)
788 return NULL;
789 else
790 return (char *)" - ";
791 }
792 /* scan an elf file and show all the fun stuff */
793 #define prints(str) write(fileno(stdout), str, strlen(str))
794 static void scanelf_file(const char *filename)
795 {
796 unsigned long i;
797 char found_pax, found_phdr, found_relro, found_load, found_textrel,
798 found_rpath, found_needed, found_interp, found_bind, found_soname,
799 found_sym, found_lib, found_file, found_textrels;
800 elfobj *elf;
801 struct stat st;
802 static char *out_buffer = NULL;
803 static size_t out_len;
804
805 /* make sure 'filename' exists */
806 if (lstat(filename, &st) == -1) {
807 if (be_verbose > 2) printf("%s: does not exist\n", filename);
808 return;
809 }
810 /* always handle regular files and handle symlinked files if no -y */
811 if (S_ISLNK(st.st_mode)) {
812 if (!scan_symlink) return;
813 stat(filename, &st);
814 }
815 if (!S_ISREG(st.st_mode)) {
816 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
817 return;
818 }
819
820 found_pax = found_phdr = found_relro = found_load = found_textrel = \
821 found_rpath = found_needed = found_interp = found_bind = found_soname = \
822 found_sym = found_lib = found_file = found_textrels = 0;
823
824 /* verify this is real ELF */
825 if ((elf = readelf(filename)) == NULL) {
826 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
827 return;
828 }
829
830 if (be_verbose > 1)
831 printf("%s: scanning file {%s,%s}\n", filename,
832 get_elfeitype(EI_CLASS, elf->elf_class),
833 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
834 else if (be_verbose)
835 printf("%s: scanning file\n", filename);
836
837 /* init output buffer */
838 if (!out_buffer) {
839 out_len = sizeof(char) * 80;
840 out_buffer = (char*)xmalloc(out_len);
841 }
842 *out_buffer = '\0';
843
844 /* show the header */
845 if (!be_quiet && show_banner) {
846 for (i = 0; out_format[i]; ++i) {
847 if (!IS_MODIFIER(out_format[i])) continue;
848
849 switch (out_format[++i]) {
850 case '%': break;
851 case '#': break;
852 case 'F':
853 case 'p':
854 case 'f': prints("FILE "); found_file = 1; break;
855 case 'o': prints(" TYPE "); break;
856 case 'x': prints(" PAX "); break;
857 case 'e': prints("STK/REL/PTL "); break;
858 case 't': prints("TEXTREL "); break;
859 case 'r': prints("RPATH "); break;
860 case 'n': prints("NEEDED "); break;
861 case 'i': prints("INTERP "); break;
862 case 'b': prints("BIND "); break;
863 case 'S': prints("SONAME "); break;
864 case 's': prints("SYM "); break;
865 case 'N': prints("LIB "); break;
866 case 'T': prints("TEXTRELS "); break;
867 default: warnf("'%c' has no title ?", out_format[i]);
868 }
869 }
870 if (!found_file) prints("FILE ");
871 prints("\n");
872 found_file = 0;
873 show_banner = 0;
874 }
875
876 /* dump all the good stuff */
877 for (i = 0; out_format[i]; ++i) {
878 const char *out;
879 const char *tmp;
880
881 /* make sure we trim leading spaces in quiet mode */
882 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
883 *out_buffer = '\0';
884
885 if (!IS_MODIFIER(out_format[i])) {
886 xchrcat(&out_buffer, out_format[i], &out_len);
887 continue;
888 }
889
890 out = NULL;
891 be_wewy_wewy_quiet = (out_format[i] == '#');
892 switch (out_format[++i]) {
893 case '%':
894 case '#':
895 xchrcat(&out_buffer, out_format[i], &out_len); break;
896 case 'F':
897 found_file = 1;
898 if (be_wewy_wewy_quiet) break;
899 xstrcat(&out_buffer, filename, &out_len);
900 break;
901 case 'p':
902 found_file = 1;
903 if (be_wewy_wewy_quiet) break;
904 tmp = filename;
905 if (search_path) {
906 ssize_t len_search = strlen(search_path);
907 ssize_t len_file = strlen(filename);
908 if (!strncmp(filename, search_path, len_search) && \
909 len_file > len_search)
910 tmp += len_search;
911 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
912 }
913 xstrcat(&out_buffer, tmp, &out_len);
914 break;
915 case 'f':
916 found_file = 1;
917 if (be_wewy_wewy_quiet) break;
918 tmp = strrchr(filename, '/');
919 tmp = (tmp == NULL ? filename : tmp+1);
920 xstrcat(&out_buffer, tmp, &out_len);
921 break;
922 case 'o': out = get_elfetype(elf); break;
923 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
924 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
925 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
926 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
927 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
928 case 'n':
929 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
930 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
931 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
932 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
933 case 's': out = scanelf_file_sym(elf, &found_sym); break;
934 default: warnf("'%c' has no scan code?", out_format[i]);
935 }
936 if (out) {
937 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
938 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
939 xstrncat(&out_buffer, out, &out_len, (tmp-out));
940 else
941 xstrcat(&out_buffer, out, &out_len);
942 }
943 }
944
945 #define FOUND_SOMETHING() \
946 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
947 found_rpath || found_needed || found_interp || found_bind || \
948 found_soname || found_sym || found_lib || found_textrels)
949
950 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
951 xchrcat(&out_buffer, ' ', &out_len);
952 xstrcat(&out_buffer, filename, &out_len);
953 }
954 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
955 puts(out_buffer);
956 fflush(stdout);
957 }
958
959 unreadelf(elf);
960 }
961
962 /* scan a directory for ET_EXEC files and print when we find one */
963 static void scanelf_dir(const char *path)
964 {
965 register DIR *dir;
966 register struct dirent *dentry;
967 struct stat st_top, st;
968 char buf[_POSIX_PATH_MAX];
969 size_t pathlen = 0, len = 0;
970
971 /* make sure path exists */
972 if (lstat(path, &st_top) == -1) {
973 if (be_verbose > 2) printf("%s: does not exist\n", path);
974 return;
975 }
976
977 /* ok, if it isn't a directory, assume we can open it */
978 if (!S_ISDIR(st_top.st_mode)) {
979 scanelf_file(path);
980 return;
981 }
982
983 /* now scan the dir looking for fun stuff */
984 if ((dir = opendir(path)) == NULL) {
985 warnf("could not opendir %s: %s", path, strerror(errno));
986 return;
987 }
988 if (be_verbose) printf("%s: scanning dir\n", path);
989
990 pathlen = strlen(path);
991 while ((dentry = readdir(dir))) {
992 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
993 continue;
994 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
995 if (len >= sizeof(buf)) {
996 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
997 (unsigned long)len, (unsigned long)sizeof(buf));
998 continue;
999 }
1000 sprintf(buf, "%s/%s", path, dentry->d_name);
1001 if (lstat(buf, &st) != -1) {
1002 if (S_ISREG(st.st_mode))
1003 scanelf_file(buf);
1004 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1005 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1006 scanelf_dir(buf);
1007 }
1008 }
1009 }
1010 closedir(dir);
1011 }
1012
1013 static int scanelf_from_file(char *filename)
1014 {
1015 FILE *fp = NULL;
1016 char *p;
1017 char path[_POSIX_PATH_MAX];
1018
1019 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1020 fp = stdin;
1021 else if ((fp = fopen(filename, "r")) == NULL)
1022 return 1;
1023
1024 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1025 if ((p = strchr(path, '\n')) != NULL)
1026 *p = 0;
1027 search_path = path;
1028 scanelf_dir(path);
1029 }
1030 if (fp != stdin)
1031 fclose(fp);
1032 return 0;
1033 }
1034
1035 static void load_ld_so_conf()
1036 {
1037 FILE *fp = NULL;
1038 char *p;
1039 char path[_POSIX_PATH_MAX];
1040 int i = 0;
1041
1042 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1043 return;
1044
1045 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1046 if (*path != '/')
1047 continue;
1048
1049 if ((p = strrchr(path, '\r')) != NULL)
1050 *p = 0;
1051 if ((p = strchr(path, '\n')) != NULL)
1052 *p = 0;
1053
1054 ldpaths[i++] = xstrdup(path);
1055
1056 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1057 break;
1058 }
1059 ldpaths[i] = NULL;
1060
1061 fclose(fp);
1062 }
1063
1064 /* scan /etc/ld.so.conf for paths */
1065 static void scanelf_ldpath()
1066 {
1067 char scan_l, scan_ul, scan_ull;
1068 int i = 0;
1069
1070 if (!ldpaths[0])
1071 err("Unable to load any paths from ld.so.conf");
1072
1073 scan_l = scan_ul = scan_ull = 0;
1074
1075 while (ldpaths[i]) {
1076 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1077 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1078 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1079 scanelf_dir(ldpaths[i]);
1080 ++i;
1081 }
1082
1083 if (!scan_l) scanelf_dir("/lib");
1084 if (!scan_ul) scanelf_dir("/usr/lib");
1085 if (!scan_ull) scanelf_dir("/usr/local/lib");
1086 }
1087
1088 /* scan env PATH for paths */
1089 static void scanelf_envpath()
1090 {
1091 char *path, *p;
1092
1093 path = getenv("PATH");
1094 if (!path)
1095 err("PATH is not set in your env !");
1096 path = xstrdup(path);
1097
1098 while ((p = strrchr(path, ':')) != NULL) {
1099 scanelf_dir(p + 1);
1100 *p = 0;
1101 }
1102
1103 free(path);
1104 }
1105
1106
1107 /* usage / invocation handling functions */
1108 #define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV"
1109 #define a_argument required_argument
1110 static struct option const long_opts[] = {
1111 {"path", no_argument, NULL, 'p'},
1112 {"ldpath", no_argument, NULL, 'l'},
1113 {"recursive", no_argument, NULL, 'R'},
1114 {"mount", no_argument, NULL, 'm'},
1115 {"symlink", no_argument, NULL, 'y'},
1116 {"pax", no_argument, NULL, 'x'},
1117 {"header", no_argument, NULL, 'e'},
1118 {"textrel", no_argument, NULL, 't'},
1119 {"rpath", no_argument, NULL, 'r'},
1120 {"needed", no_argument, NULL, 'n'},
1121 {"ldcache", no_argument, NULL, 'L'},
1122 {"interp", no_argument, NULL, 'i'},
1123 {"bind", no_argument, NULL, 'b'},
1124 {"soname", no_argument, NULL, 'S'},
1125 {"symbol", a_argument, NULL, 's'},
1126 {"lib", a_argument, NULL, 'N'},
1127 {"gmatch", no_argument, NULL, 'g'},
1128 {"textrels", no_argument, NULL, 'T'},
1129 {"all", no_argument, NULL, 'a'},
1130 {"quiet", no_argument, NULL, 'q'},
1131 {"verbose", no_argument, NULL, 'v'},
1132 {"format", a_argument, NULL, 'F'},
1133 {"from", a_argument, NULL, 'f'},
1134 {"file", a_argument, NULL, 'o'},
1135 {"nobanner", no_argument, NULL, 'B'},
1136 {"help", no_argument, NULL, 'h'},
1137 {"version", no_argument, NULL, 'V'},
1138 {NULL, no_argument, NULL, 0x0}
1139 };
1140
1141 static const char *opts_help[] = {
1142 "Scan all directories in PATH environment",
1143 "Scan all directories in /etc/ld.so.conf",
1144 "Scan directories recursively",
1145 "Don't recursively cross mount points",
1146 "Don't scan symlinks\n",
1147 "Print PaX markings",
1148 "Print GNU_STACK/PT_LOAD markings",
1149 "Print TEXTREL information",
1150 "Print RPATH information",
1151 "Print NEEDED information",
1152 "Resolve NEEDED information (use with -n)",
1153 "Print INTERP information",
1154 "Print BIND information",
1155 "Print SONAME information",
1156 "Find a specified symbol",
1157 "Find a specified library",
1158 "Use strncmp to match libraries. (use with -N)",
1159 "Locate cause of TEXTREL",
1160 "Print all scanned info (-x -e -t -r -b)\n",
1161 "Only output 'bad' things",
1162 "Be verbose (can be specified more than once)",
1163 "Use specified format for output",
1164 "Read input stream from a filename",
1165 "Write output stream to a filename",
1166 "Don't display the header",
1167 "Print this help and exit",
1168 "Print version and exit",
1169 NULL
1170 };
1171
1172 /* display usage and exit */
1173 static void usage(int status)
1174 {
1175 unsigned long i;
1176 printf("* Scan ELF binaries for stuff\n\n"
1177 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1178 printf("Options: -[%s]\n", PARSE_FLAGS);
1179 for (i = 0; long_opts[i].name; ++i)
1180 if (long_opts[i].has_arg == no_argument)
1181 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1182 long_opts[i].name, opts_help[i]);
1183 else
1184 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1185 long_opts[i].name, opts_help[i]);
1186
1187 if (status != EXIT_SUCCESS)
1188 exit(status);
1189
1190 puts("\nThe format modifiers for the -F option are:");
1191 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1192 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1193 puts(" i INTERP \tb BIND \ts symbol");
1194 puts(" N library \to Type \tT TEXTRELs");
1195 puts(" S SONAME");
1196 puts(" p filename (with search path removed)");
1197 puts(" f filename (short name/basename)");
1198 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1199
1200 exit(status);
1201 }
1202
1203 /* parse command line arguments and preform needed actions */
1204 static void parseargs(int argc, char *argv[])
1205 {
1206 int i;
1207 char *from_file = NULL;
1208
1209 opterr = 0;
1210 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1211 switch (i) {
1212
1213 case 'V':
1214 printf("pax-utils-%s: %s compiled %s\n%s\n"
1215 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1216 VERSION, __FILE__, __DATE__, rcsid, argv0);
1217 exit(EXIT_SUCCESS);
1218 break;
1219 case 'h': usage(EXIT_SUCCESS); break;
1220 case 'f':
1221 if (from_file) err("Don't specify -f twice");
1222 from_file = xstrdup(optarg);
1223 break;
1224 case 'o': {
1225 FILE *fp = NULL;
1226 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1227 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1228 SET_STDOUT(fp);
1229 break;
1230 }
1231
1232 case 's': {
1233 if (find_sym) warn("You prob don't want to specify -s twice");
1234 find_sym = optarg;
1235 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1236 sprintf(versioned_symname, "%s@", find_sym);
1237 break;
1238 }
1239 case 'N': {
1240 if (find_lib) warn("You prob don't want to specify -N twice");
1241 find_lib = optarg;
1242 break;
1243 }
1244
1245 case 'F': {
1246 if (out_format) warn("You prob don't want to specify -F twice");
1247 out_format = optarg;
1248 break;
1249 }
1250
1251 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1252 case 'L': printcache = 1; break;
1253 case 'y': scan_symlink = 0; break;
1254 case 'B': show_banner = 0; break;
1255 case 'l': scan_ldpath = 1; break;
1256 case 'p': scan_envpath = 1; break;
1257 case 'R': dir_recurse = 1; break;
1258 case 'm': dir_crossmount = 0; break;
1259 case 'x': show_pax = 1; break;
1260 case 'e': show_phdr = 1; break;
1261 case 't': show_textrel = 1; break;
1262 case 'r': show_rpath = 1; break;
1263 case 'n': show_needed = 1; break;
1264 case 'i': show_interp = 1; break;
1265 case 'b': show_bind = 1; break;
1266 case 'S': show_soname = 1; break;
1267 case 'T': show_textrels = 1; break;
1268 case 'q': be_quiet = 1; break;
1269 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1270 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1271
1272 case ':':
1273 err("Option missing parameter\n");
1274 case '?':
1275 err("Unknown option\n");
1276 default:
1277 err("Unhandled option '%c'", i);
1278 }
1279 }
1280
1281 /* let the format option override all other options */
1282 if (out_format) {
1283 show_pax = show_phdr = show_textrel = show_rpath = \
1284 show_needed = show_interp = show_bind = show_soname = \
1285 show_textrels = 0;
1286 for (i = 0; out_format[i]; ++i) {
1287 if (!IS_MODIFIER(out_format[i])) continue;
1288
1289 switch (out_format[++i]) {
1290 case '%': break;
1291 case '#': break;
1292 case 'F': break;
1293 case 'p': break;
1294 case 'f': break;
1295 case 's': break;
1296 case 'N': break;
1297 case 'o': break;
1298 case 'x': show_pax = 1; break;
1299 case 'e': show_phdr = 1; break;
1300 case 't': show_textrel = 1; break;
1301 case 'r': show_rpath = 1; break;
1302 case 'n': show_needed = 1; break;
1303 case 'i': show_interp = 1; break;
1304 case 'b': show_bind = 1; break;
1305 case 'S': show_soname = 1; break;
1306 case 'T': show_textrels = 1; break;
1307 default:
1308 err("Invalid format specifier '%c' (byte %i)",
1309 out_format[i], i+1);
1310 }
1311 }
1312
1313 /* construct our default format */
1314 } else {
1315 size_t fmt_len = 30;
1316 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1317 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1318 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1319 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1320 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1321 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1322 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1323 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1324 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1325 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1326 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1327 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1328 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1329 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1330 }
1331 if (be_verbose > 2) printf("Format: %s\n", out_format);
1332
1333 /* now lets actually do the scanning */
1334 if (scan_ldpath || (show_rpath && be_quiet))
1335 load_ld_so_conf();
1336 if (scan_ldpath) scanelf_ldpath();
1337 if (scan_envpath) scanelf_envpath();
1338 if (from_file) {
1339 scanelf_from_file(from_file);
1340 free(from_file);
1341 from_file = *argv;
1342 }
1343 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1344 err("Nothing to scan !?");
1345 while (optind < argc) {
1346 search_path = argv[optind++];
1347 scanelf_dir(search_path);
1348 }
1349
1350 /* clean up */
1351 if (versioned_symname) free(versioned_symname);
1352 for (i = 0; ldpaths[i]; ++i)
1353 free(ldpaths[i]);
1354
1355 if (ldcache != 0)
1356 munmap(ldcache, ldcache_size);
1357 }
1358
1359
1360
1361 /* utility funcs */
1362 static char *xstrdup(const char *s)
1363 {
1364 char *ret = strdup(s);
1365 if (!ret) err("Could not strdup(): %s", strerror(errno));
1366 return ret;
1367 }
1368 static void *xmalloc(size_t size)
1369 {
1370 void *ret = malloc(size);
1371 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1372 return ret;
1373 }
1374 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1375 {
1376 size_t new_len;
1377
1378 new_len = strlen(*dst) + strlen(src);
1379 if (*curr_len <= new_len) {
1380 *curr_len = new_len + (*curr_len / 2);
1381 *dst = realloc(*dst, *curr_len);
1382 if (!*dst)
1383 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1384 }
1385
1386 if (n)
1387 strncat(*dst, src, n);
1388 else
1389 strcat(*dst, src);
1390 }
1391 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1392 {
1393 static char my_app[2];
1394 my_app[0] = append;
1395 my_app[1] = '\0';
1396 xstrcat(dst, my_app, curr_len);
1397 }
1398
1399
1400
1401 int main(int argc, char *argv[])
1402 {
1403 if (argc < 2)
1404 usage(EXIT_FAILURE);
1405 parseargs(argc, argv);
1406 fclose(stdout);
1407 #ifdef __BOUNDS_CHECKING_ON
1408 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1409 #endif
1410 return EXIT_SUCCESS;
1411 }

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