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

Contents of /pax-utils/scanelf.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.97 - (show annotations) (download) (as text)
Thu Dec 29 14:03:25 2005 UTC (8 years, 11 months ago) by vapier
Branch: MAIN
Changes since 1.96: +35 -13 lines
File MIME type: text/x-csrc
touchup lookup_cache_lib() func a bit by plugging some memleaks, adding some comments, and handling 64/32 bit multilib systems

1 /*
2 * Copyright 2003-2005 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 1.96 2005/12/28 22:26:47 solar Exp $
5 *
6 * Copyright 2003-2005 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2005 Mike Frysinger - <vapier@gentoo.org>
8 */
9
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <sys/types.h>
13 #include <libgen.h>
14 #include <limits.h>
15 #include <string.h>
16 #include <errno.h>
17 #include <unistd.h>
18 #include <sys/stat.h>
19 #include <sys/mman.h>
20 #include <fcntl.h>
21 #include <dirent.h>
22 #include <getopt.h>
23 #include <assert.h>
24 #include "paxinc.h"
25
26 static const char *rcsid = "$Id: scanelf.c,v 1.96 2005/12/28 22:26:47 solar Exp $";
27 #define argv0 "scanelf"
28
29 #define IS_MODIFIER(c) (c == '%' || c == '#')
30
31
32
33 /* prototypes */
34 static void scanelf_file(const char *filename);
35 static void scanelf_dir(const char *path);
36 static void scanelf_ldpath();
37 static void scanelf_envpath();
38 static void usage(int status);
39 static void parseargs(int argc, char *argv[]);
40 static char *xstrdup(const char *s);
41 static void *xmalloc(size_t size);
42 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
43 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
44 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
45
46 /* variables to control behavior */
47 static char *ldpaths[256];
48 static char scan_ldpath = 0;
49 static char scan_envpath = 0;
50 static char scan_symlink = 1;
51 static char dir_recurse = 0;
52 static char dir_crossmount = 1;
53 static char show_pax = 0;
54 static char show_phdr = 0;
55 static char show_textrel = 0;
56 static char show_rpath = 0;
57 static char show_needed = 0;
58 static char show_interp = 0;
59 static char show_bind = 0;
60 static char show_soname = 0;
61 static char show_textrels = 0;
62 static char show_banner = 1;
63 static char be_quiet = 0;
64 static char be_verbose = 0;
65 static char be_wewy_wewy_quiet = 0;
66 static char *find_sym = NULL, *versioned_symname = NULL;
67 static char *find_lib = NULL;
68 static char *out_format = NULL;
69 static char *search_path = NULL;
70 static char gmatch = 0;
71 static char printcache = 0;
72
73
74 caddr_t ldcache = 0;
75 size_t ldcache_size = 0;
76
77 /* sub-funcs for scanelf_file() */
78 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
79 {
80 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
81 #define GET_SYMTABS(B) \
82 if (elf->elf_class == ELFCLASS ## B) { \
83 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
84 /* debug sections */ \
85 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
86 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
87 /* runtime sections */ \
88 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
89 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
90 if (symtab && dynsym) { \
91 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
92 } else { \
93 *sym = (void*)(symtab ? symtab : dynsym); \
94 } \
95 if (strtab && dynstr) { \
96 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
97 } else { \
98 *tab = (void*)(strtab ? strtab : dynstr); \
99 } \
100 }
101 GET_SYMTABS(32)
102 GET_SYMTABS(64)
103 }
104 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
105 {
106 static char ret[7];
107 unsigned long i, shown;
108
109 if (!show_pax) return NULL;
110
111 shown = 0;
112 memset(&ret, 0, sizeof(ret));
113
114 if (elf->phdr) {
115 #define SHOW_PAX(B) \
116 if (elf->elf_class == ELFCLASS ## B) { \
117 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
118 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
119 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
120 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
121 continue; \
122 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
123 continue; \
124 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
125 *found_pax = 1; \
126 ++shown; \
127 break; \
128 } \
129 }
130 SHOW_PAX(32)
131 SHOW_PAX(64)
132 }
133
134 /* fall back to EI_PAX if no PT_PAX was found */
135 if (!*ret) {
136 static char *paxflags;
137 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
138 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
139 *found_pax = 1;
140 return (be_wewy_wewy_quiet ? NULL : paxflags);
141 }
142 strncpy(ret, paxflags, sizeof(ret));
143 }
144
145 if (be_wewy_wewy_quiet || (be_quiet && !shown))
146 return NULL;
147 else
148 return ret;
149 }
150
151 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
152 {
153 static char ret[12];
154 char *found;
155 unsigned long i, shown;
156 unsigned char multi_stack, multi_relro, multi_load;
157
158 if (!show_phdr) return NULL;
159
160 memcpy(ret, "--- --- ---\0", 12);
161
162 shown = 0;
163 multi_stack = multi_relro = multi_load = 0;
164
165 #define SHOW_PHDR(B) \
166 if (elf->elf_class == ELFCLASS ## B) { \
167 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
168 Elf ## B ## _Off offset; \
169 uint32_t flags, check_flags; \
170 if (elf->phdr != NULL) { \
171 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
172 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
173 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
174 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
175 found = found_phdr; \
176 offset = 0; \
177 check_flags = PF_X; \
178 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
179 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
180 found = found_relro; \
181 offset = 4; \
182 check_flags = PF_X; \
183 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
184 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
185 found = found_load; \
186 offset = 8; \
187 check_flags = PF_W|PF_X; \
188 } else \
189 continue; \
190 flags = EGET(phdr[i].p_flags); \
191 if (be_quiet && ((flags & check_flags) != check_flags)) \
192 continue; \
193 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
194 *found = 1; \
195 ++shown; \
196 } \
197 } else if (elf->shdr != NULL) { \
198 /* no program headers which means this is prob an object file */ \
199 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
200 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
201 check_flags = SHF_WRITE|SHF_EXECINSTR; \
202 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
203 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
204 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
205 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
206 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
207 flags = EGET(shdr[i].sh_flags); \
208 if (be_quiet && ((flags & check_flags) != check_flags)) \
209 continue; \
210 ++*found_phdr; \
211 shown = 1; \
212 if (flags & SHF_WRITE) ret[0] = 'W'; \
213 if (flags & SHF_ALLOC) ret[1] = 'A'; \
214 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
215 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
216 break; \
217 } \
218 } \
219 if (!multi_stack) { \
220 *found_phdr = 1; \
221 shown = 1; \
222 memcpy(ret, "!WX", 3); \
223 } \
224 } \
225 }
226 SHOW_PHDR(32)
227 SHOW_PHDR(64)
228
229 if (be_wewy_wewy_quiet || (be_quiet && !shown))
230 return NULL;
231 else
232 return ret;
233 }
234 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
235 {
236 static const char *ret = "TEXTREL";
237 unsigned long i;
238
239 if (!show_textrel && !show_textrels) return NULL;
240
241 if (elf->phdr) {
242 #define SHOW_TEXTREL(B) \
243 if (elf->elf_class == ELFCLASS ## B) { \
244 Elf ## B ## _Dyn *dyn; \
245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
247 Elf ## B ## _Off offset; \
248 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
249 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
250 offset = EGET(phdr[i].p_offset); \
251 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
252 dyn = DYN ## B (elf->data + offset); \
253 while (EGET(dyn->d_tag) != DT_NULL) { \
254 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
255 *found_textrel = 1; \
256 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
257 return (be_wewy_wewy_quiet ? NULL : ret); \
258 } \
259 ++dyn; \
260 } \
261 } }
262 SHOW_TEXTREL(32)
263 SHOW_TEXTREL(64)
264 }
265
266 if (be_quiet || be_wewy_wewy_quiet)
267 return NULL;
268 else
269 return " - ";
270 }
271 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
272 {
273 unsigned long s, r, rmax;
274 void *symtab_void, *strtab_void, *text_void;
275
276 if (!show_textrels) return NULL;
277
278 /* don't search for TEXTREL's if the ELF doesn't have any */
279 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
280 if (!*found_textrel) return NULL;
281
282 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
283 text_void = elf_findsecbyname(elf, ".text");
284
285 if (symtab_void && strtab_void && text_void && elf->shdr) {
286 #define SHOW_TEXTRELS(B) \
287 if (elf->elf_class == ELFCLASS ## B) { \
288 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
289 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
290 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
291 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
292 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
293 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
294 uint ## B ## _t memsz = EGET(text->sh_size); \
295 Elf ## B ## _Rel *rel; \
296 Elf ## B ## _Rela *rela; \
297 /* search the section headers for relocations */ \
298 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
299 uint32_t sh_type = EGET(shdr[s].sh_type); \
300 if (sh_type == SHT_REL) { \
301 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
302 rela = NULL; \
303 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
304 } else if (sh_type == SHT_RELA) { \
305 rel = NULL; \
306 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
307 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
308 } else \
309 continue; \
310 /* now see if any of the relocs are in the .text */ \
311 for (r = 0; r < rmax; ++r) { \
312 unsigned long sym_max; \
313 Elf ## B ## _Addr offset_tmp; \
314 Elf ## B ## _Sym *func; \
315 Elf ## B ## _Sym *sym; \
316 Elf ## B ## _Addr r_offset; \
317 uint ## B ## _t r_info; \
318 if (sh_type == SHT_REL) { \
319 r_offset = EGET(rel[r].r_offset); \
320 r_info = EGET(rel[r].r_info); \
321 } else { \
322 r_offset = EGET(rela[r].r_offset); \
323 r_info = EGET(rela[r].r_info); \
324 } \
325 /* make sure this relocation is inside of the .text */ \
326 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
327 if (be_verbose <= 2) continue; \
328 } else \
329 *found_textrels = 1; \
330 /* locate this relocation symbol name */ \
331 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
332 sym_max = ELF ## B ## _R_SYM(r_info); \
333 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
334 sym += sym_max; \
335 else \
336 sym = NULL; \
337 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
338 /* show the raw details about this reloc */ \
339 printf(" %s: ", elf->base_filename); \
340 if (sym && sym->st_name) \
341 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
342 else \
343 printf("(memory/fake?)"); \
344 printf(" [0x%lX]", (unsigned long)r_offset); \
345 /* now try to find the closest symbol that this rel is probably in */ \
346 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
347 func = NULL; \
348 offset_tmp = 0; \
349 while (sym_max--) { \
350 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
351 func = sym; \
352 offset_tmp = EGET(sym->st_value); \
353 } \
354 ++sym; \
355 } \
356 printf(" in "); \
357 if (func && func->st_name) \
358 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
359 else \
360 printf("(NULL: fake?)"); \
361 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
362 } \
363 } }
364 SHOW_TEXTRELS(32)
365 SHOW_TEXTRELS(64)
366 }
367 if (!*found_textrels)
368 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
369
370 return NULL;
371 }
372
373 static void rpath_security_checks(elfobj *, char *);
374 static void rpath_security_checks(elfobj *elf, char *item) {
375 struct stat st;
376 switch (*item) {
377 case '/': break;
378 case '.':
379 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
380 break;
381 case '\0':
382 warnf("Security problem NULL RPATH in %s", elf->filename);
383 break;
384 case '$':
385 if (fstat(elf->fd, &st) != -1)
386 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
387 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
388 item, elf->filename, st.st_mode & 07777);
389 break;
390 default:
391 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
392 break;
393 }
394 }
395 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
396 {
397 unsigned long i, s;
398 char *rpath, *runpath, **r;
399 void *strtbl_void;
400
401 if (!show_rpath) return;
402
403 strtbl_void = elf_findsecbyname(elf, ".dynstr");
404 rpath = runpath = NULL;
405
406 if (elf->phdr && strtbl_void) {
407 #define SHOW_RPATH(B) \
408 if (elf->elf_class == ELFCLASS ## B) { \
409 Elf ## B ## _Dyn *dyn; \
410 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
411 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
412 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
413 Elf ## B ## _Off offset; \
414 Elf ## B ## _Xword word; \
415 /* Scan all the program headers */ \
416 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
417 /* Just scan dynamic headers */ \
418 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
419 offset = EGET(phdr[i].p_offset); \
420 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
421 /* Just scan dynamic RPATH/RUNPATH headers */ \
422 dyn = DYN ## B (elf->data + offset); \
423 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
424 if (word == DT_RPATH) { \
425 r = &rpath; \
426 } else if (word == DT_RUNPATH) { \
427 r = &runpath; \
428 } else { \
429 ++dyn; \
430 continue; \
431 } \
432 /* Verify the memory is somewhat sane */ \
433 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
434 if (offset < (Elf ## B ## _Off)elf->len) { \
435 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
436 *r = (char*)(elf->data + offset); \
437 /* If quiet, don't output paths in ld.so.conf */ \
438 if (be_quiet) { \
439 size_t len; \
440 char *start, *end; \
441 /* note that we only 'chop' off leading known paths. */ \
442 /* since *r is read-only memory, we can only move the ptr forward. */ \
443 start = *r; \
444 /* scan each path in : delimited list */ \
445 while (start) { \
446 rpath_security_checks(elf, start); \
447 end = strchr(start, ':'); \
448 len = (end ? abs(end - start) : strlen(start)); \
449 for (s = 0; ldpaths[s]; ++s) { \
450 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
451 *r = (end ? end + 1 : NULL); \
452 break; \
453 } \
454 } \
455 if (!*r || !ldpaths[s] || !end) \
456 start = NULL; \
457 else \
458 start = start + len + 1; \
459 } \
460 } \
461 if (*r) *found_rpath = 1; \
462 } \
463 ++dyn; \
464 } \
465 } }
466 SHOW_RPATH(32)
467 SHOW_RPATH(64)
468 }
469
470 if (be_wewy_wewy_quiet) return;
471
472 if (rpath && runpath) {
473 if (!strcmp(rpath, runpath)) {
474 xstrcat(ret, runpath, ret_len);
475 } else {
476 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
477 xchrcat(ret, '{', ret_len);
478 xstrcat(ret, rpath, ret_len);
479 xchrcat(ret, ',', ret_len);
480 xstrcat(ret, runpath, ret_len);
481 xchrcat(ret, '}', ret_len);
482 }
483 } else if (rpath || runpath)
484 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
485 else if (!be_quiet)
486 xstrcat(ret, " - ", ret_len);
487 }
488
489 #define LDSO_CACHE_MAGIC "ld.so-"
490 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
491 #define LDSO_CACHE_VER "1.7.0"
492 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
493 #define FLAG_ANY -1
494 #define FLAG_TYPE_MASK 0x00ff
495 #define FLAG_LIBC4 0x0000
496 #define FLAG_ELF 0x0001
497 #define FLAG_ELF_LIBC5 0x0002
498 #define FLAG_ELF_LIBC6 0x0003
499 #define FLAG_REQUIRED_MASK 0xff00
500 #define FLAG_SPARC_LIB64 0x0100
501 #define FLAG_IA64_LIB64 0x0200
502 #define FLAG_X8664_LIB64 0x0300
503 #define FLAG_S390_LIB64 0x0400
504 #define FLAG_POWERPC_LIB64 0x0500
505 #define FLAG_MIPS64_LIBN32 0x0600
506 #define FLAG_MIPS64_LIBN64 0x0700
507
508 static char *lookup_cache_lib(elfobj *, char *);
509 static char *lookup_cache_lib(elfobj *elf, char *fname)
510 {
511 int fd = 0;
512 char *strs;
513 static char buf[_POSIX_PATH_MAX] = "";
514 const char *cachefile = "/etc/ld.so.cache";
515 struct stat st;
516
517 typedef struct {
518 char magic[LDSO_CACHE_MAGIC_LEN];
519 char version[LDSO_CACHE_VER_LEN];
520 int nlibs;
521 } header_t;
522 header_t *header;
523
524 typedef struct {
525 int flags;
526 int sooffset;
527 int liboffset;
528 } libentry_t;
529 libentry_t *libent;
530
531 if (fname == NULL)
532 return NULL;
533
534 if (ldcache == 0) {
535 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
536 return NULL;
537
538 /* cache these values so we only map/unmap the cache file once */
539 ldcache_size = st.st_size;
540 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
541
542 close(fd);
543
544 if (ldcache == (caddr_t)-1)
545 return NULL;
546
547 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
548 return NULL;
549 if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
550 return NULL;
551 }
552
553 header = (header_t *) ldcache;
554 libent = (libentry_t *) (ldcache + sizeof(header_t));
555 strs = (char *) &libent[header->nlibs];
556
557 for (fd = 0; fd < header->nlibs; fd++) {
558 /* this should be more fine grained, but for now we assume that
559 * diff arches will not be cached together. and we ignore the
560 * the different multilib mips cases. */
561 if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
562 continue;
563 if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
564 continue;
565
566 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
567 continue;
568 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
569 }
570 return buf;
571 }
572
573
574 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
575 {
576 unsigned long i;
577 char *needed;
578 void *strtbl_void;
579 char *p;
580
581 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
582
583 strtbl_void = elf_findsecbyname(elf, ".dynstr");
584
585 if (elf->phdr && strtbl_void) {
586 #define SHOW_NEEDED(B) \
587 if (elf->elf_class == ELFCLASS ## B) { \
588 Elf ## B ## _Dyn *dyn; \
589 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
590 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
591 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
592 Elf ## B ## _Off offset; \
593 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
594 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
595 offset = EGET(phdr[i].p_offset); \
596 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
597 dyn = DYN ## B (elf->data + offset); \
598 while (EGET(dyn->d_tag) != DT_NULL) { \
599 if (EGET(dyn->d_tag) == DT_NEEDED) { \
600 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
601 if (offset >= (Elf ## B ## _Off)elf->len) { \
602 ++dyn; \
603 continue; \
604 } \
605 needed = (char*)(elf->data + offset); \
606 if (op == 0) { \
607 if (!be_wewy_wewy_quiet) { \
608 if (*found_needed) xchrcat(ret, ',', ret_len); \
609 if (printcache) \
610 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
611 needed = p; \
612 xstrcat(ret, needed, ret_len); \
613 } \
614 *found_needed = 1; \
615 } else { \
616 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
617 *found_lib = 1; \
618 return (be_wewy_wewy_quiet ? NULL : needed); \
619 } \
620 } \
621 } \
622 ++dyn; \
623 } \
624 } }
625 SHOW_NEEDED(32)
626 SHOW_NEEDED(64)
627 if (op == 0 && !*found_needed && be_verbose)
628 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
629 }
630
631 return NULL;
632 }
633 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
634 {
635 void *strtbl_void;
636
637 if (!show_interp) return NULL;
638
639 strtbl_void = elf_findsecbyname(elf, ".interp");
640
641 if (strtbl_void) {
642 #define SHOW_INTERP(B) \
643 if (elf->elf_class == ELFCLASS ## B) { \
644 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
645 *found_interp = 1; \
646 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
647 }
648 SHOW_INTERP(32)
649 SHOW_INTERP(64)
650 }
651 return NULL;
652 }
653 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
654 {
655 unsigned long i;
656 struct stat s;
657
658 if (!show_bind) return NULL;
659 if (!elf->phdr) return NULL;
660
661 #define SHOW_BIND(B) \
662 if (elf->elf_class == ELFCLASS ## B) { \
663 Elf ## B ## _Dyn *dyn; \
664 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
665 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
666 Elf ## B ## _Off offset; \
667 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
668 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
669 offset = EGET(phdr[i].p_offset); \
670 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
671 dyn = DYN ## B (elf->data + offset); \
672 while (EGET(dyn->d_tag) != DT_NULL) { \
673 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
674 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
675 { \
676 if (be_quiet) return NULL; \
677 *found_bind = 1; \
678 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
679 } \
680 ++dyn; \
681 } \
682 } \
683 }
684 SHOW_BIND(32)
685 SHOW_BIND(64)
686
687 if (be_wewy_wewy_quiet) return NULL;
688
689 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
690 return NULL;
691 } else {
692 *found_bind = 1;
693 return (char *) "LAZY";
694 }
695 }
696 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
697 {
698 unsigned long i;
699 char *soname;
700 void *strtbl_void;
701
702 if (!show_soname) return NULL;
703
704 strtbl_void = elf_findsecbyname(elf, ".dynstr");
705
706 if (elf->phdr && strtbl_void) {
707 #define SHOW_SONAME(B) \
708 if (elf->elf_class == ELFCLASS ## B) { \
709 Elf ## B ## _Dyn *dyn; \
710 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
711 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
712 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
713 Elf ## B ## _Off offset; \
714 /* only look for soname in shared objects */ \
715 if (ehdr->e_type != ET_DYN) \
716 return NULL; \
717 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
718 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
719 offset = EGET(phdr[i].p_offset); \
720 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
721 dyn = DYN ## B (elf->data + offset); \
722 while (EGET(dyn->d_tag) != DT_NULL) { \
723 if (EGET(dyn->d_tag) == DT_SONAME) { \
724 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
725 if (offset >= (Elf ## B ## _Off)elf->len) { \
726 ++dyn; \
727 continue; \
728 } \
729 soname = (char*)(elf->data + offset); \
730 *found_soname = 1; \
731 return (be_wewy_wewy_quiet ? NULL : soname); \
732 } \
733 ++dyn; \
734 } \
735 } }
736 SHOW_SONAME(32)
737 SHOW_SONAME(64)
738 }
739
740 return NULL;
741 }
742 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
743 {
744 unsigned long i;
745 char *ret;
746 void *symtab_void, *strtab_void;
747
748 if (!find_sym) return NULL;
749 ret = find_sym;
750
751 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
752
753 if (symtab_void && strtab_void) {
754 #define FIND_SYM(B) \
755 if (elf->elf_class == ELFCLASS ## B) { \
756 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
757 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
758 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
759 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
760 char *symname; \
761 for (i = 0; i < cnt; ++i) { \
762 if (sym->st_name) { \
763 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
764 if (*find_sym == '*') { \
765 printf("%s(%s) %5lX %15s %s\n", \
766 ((*found_sym == 0) ? "\n\t" : "\t"), \
767 elf->base_filename, \
768 (unsigned long)sym->st_size, \
769 get_elfstttype(sym->st_info), \
770 symname); \
771 *found_sym = 1; \
772 } else { \
773 char *this_sym, *next_sym; \
774 this_sym = find_sym; \
775 do { \
776 next_sym = strchr(this_sym, ','); \
777 if (next_sym == NULL) \
778 next_sym = this_sym + strlen(this_sym); \
779 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
780 (strcmp(symname, versioned_symname) == 0)) { \
781 ret = this_sym; \
782 (*found_sym)++; \
783 goto break_out; \
784 } \
785 this_sym = next_sym + 1; \
786 } while (*next_sym != '\0'); \
787 } \
788 } \
789 ++sym; \
790 } }
791 FIND_SYM(32)
792 FIND_SYM(64)
793 }
794
795 break_out:
796 if (be_wewy_wewy_quiet) return NULL;
797
798 if (*find_sym != '*' && *found_sym)
799 return ret;
800 if (be_quiet)
801 return NULL;
802 else
803 return (char *)" - ";
804 }
805 /* scan an elf file and show all the fun stuff */
806 #define prints(str) write(fileno(stdout), str, strlen(str))
807 static void scanelf_file(const char *filename)
808 {
809 unsigned long i;
810 char found_pax, found_phdr, found_relro, found_load, found_textrel,
811 found_rpath, found_needed, found_interp, found_bind, found_soname,
812 found_sym, found_lib, found_file, found_textrels;
813 elfobj *elf;
814 struct stat st;
815 static char *out_buffer = NULL;
816 static size_t out_len;
817
818 /* make sure 'filename' exists */
819 if (lstat(filename, &st) == -1) {
820 if (be_verbose > 2) printf("%s: does not exist\n", filename);
821 return;
822 }
823 /* always handle regular files and handle symlinked files if no -y */
824 if (S_ISLNK(st.st_mode)) {
825 if (!scan_symlink) return;
826 stat(filename, &st);
827 }
828 if (!S_ISREG(st.st_mode)) {
829 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
830 return;
831 }
832
833 found_pax = found_phdr = found_relro = found_load = found_textrel = \
834 found_rpath = found_needed = found_interp = found_bind = found_soname = \
835 found_sym = found_lib = found_file = found_textrels = 0;
836
837 /* verify this is real ELF */
838 if ((elf = readelf(filename)) == NULL) {
839 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
840 return;
841 }
842
843 if (be_verbose > 1)
844 printf("%s: scanning file {%s,%s}\n", filename,
845 get_elfeitype(EI_CLASS, elf->elf_class),
846 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
847 else if (be_verbose)
848 printf("%s: scanning file\n", filename);
849
850 /* init output buffer */
851 if (!out_buffer) {
852 out_len = sizeof(char) * 80;
853 out_buffer = (char*)xmalloc(out_len);
854 }
855 *out_buffer = '\0';
856
857 /* show the header */
858 if (!be_quiet && show_banner) {
859 for (i = 0; out_format[i]; ++i) {
860 if (!IS_MODIFIER(out_format[i])) continue;
861
862 switch (out_format[++i]) {
863 case '%': break;
864 case '#': break;
865 case 'F':
866 case 'p':
867 case 'f': prints("FILE "); found_file = 1; break;
868 case 'o': prints(" TYPE "); break;
869 case 'x': prints(" PAX "); break;
870 case 'e': prints("STK/REL/PTL "); break;
871 case 't': prints("TEXTREL "); break;
872 case 'r': prints("RPATH "); break;
873 case 'n': prints("NEEDED "); break;
874 case 'i': prints("INTERP "); break;
875 case 'b': prints("BIND "); break;
876 case 'S': prints("SONAME "); break;
877 case 's': prints("SYM "); break;
878 case 'N': prints("LIB "); break;
879 case 'T': prints("TEXTRELS "); break;
880 default: warnf("'%c' has no title ?", out_format[i]);
881 }
882 }
883 if (!found_file) prints("FILE ");
884 prints("\n");
885 found_file = 0;
886 show_banner = 0;
887 }
888
889 /* dump all the good stuff */
890 for (i = 0; out_format[i]; ++i) {
891 const char *out;
892 const char *tmp;
893
894 /* make sure we trim leading spaces in quiet mode */
895 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
896 *out_buffer = '\0';
897
898 if (!IS_MODIFIER(out_format[i])) {
899 xchrcat(&out_buffer, out_format[i], &out_len);
900 continue;
901 }
902
903 out = NULL;
904 be_wewy_wewy_quiet = (out_format[i] == '#');
905 switch (out_format[++i]) {
906 case '%':
907 case '#':
908 xchrcat(&out_buffer, out_format[i], &out_len); break;
909 case 'F':
910 found_file = 1;
911 if (be_wewy_wewy_quiet) break;
912 xstrcat(&out_buffer, filename, &out_len);
913 break;
914 case 'p':
915 found_file = 1;
916 if (be_wewy_wewy_quiet) break;
917 tmp = filename;
918 if (search_path) {
919 ssize_t len_search = strlen(search_path);
920 ssize_t len_file = strlen(filename);
921 if (!strncmp(filename, search_path, len_search) && \
922 len_file > len_search)
923 tmp += len_search;
924 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
925 }
926 xstrcat(&out_buffer, tmp, &out_len);
927 break;
928 case 'f':
929 found_file = 1;
930 if (be_wewy_wewy_quiet) break;
931 tmp = strrchr(filename, '/');
932 tmp = (tmp == NULL ? filename : tmp+1);
933 xstrcat(&out_buffer, tmp, &out_len);
934 break;
935 case 'o': out = get_elfetype(elf); break;
936 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
937 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
938 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
939 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
940 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
941 case 'n':
942 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
943 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
944 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
945 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
946 case 's': out = scanelf_file_sym(elf, &found_sym); break;
947 default: warnf("'%c' has no scan code?", out_format[i]);
948 }
949 if (out) {
950 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
951 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
952 xstrncat(&out_buffer, out, &out_len, (tmp-out));
953 else
954 xstrcat(&out_buffer, out, &out_len);
955 }
956 }
957
958 #define FOUND_SOMETHING() \
959 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
960 found_rpath || found_needed || found_interp || found_bind || \
961 found_soname || found_sym || found_lib || found_textrels)
962
963 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
964 xchrcat(&out_buffer, ' ', &out_len);
965 xstrcat(&out_buffer, filename, &out_len);
966 }
967 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
968 puts(out_buffer);
969 fflush(stdout);
970 }
971
972 unreadelf(elf);
973 }
974
975 /* scan a directory for ET_EXEC files and print when we find one */
976 static void scanelf_dir(const char *path)
977 {
978 register DIR *dir;
979 register struct dirent *dentry;
980 struct stat st_top, st;
981 char buf[_POSIX_PATH_MAX];
982 size_t pathlen = 0, len = 0;
983
984 /* make sure path exists */
985 if (lstat(path, &st_top) == -1) {
986 if (be_verbose > 2) printf("%s: does not exist\n", path);
987 return;
988 }
989
990 /* ok, if it isn't a directory, assume we can open it */
991 if (!S_ISDIR(st_top.st_mode)) {
992 scanelf_file(path);
993 return;
994 }
995
996 /* now scan the dir looking for fun stuff */
997 if ((dir = opendir(path)) == NULL) {
998 warnf("could not opendir %s: %s", path, strerror(errno));
999 return;
1000 }
1001 if (be_verbose) printf("%s: scanning dir\n", path);
1002
1003 pathlen = strlen(path);
1004 while ((dentry = readdir(dir))) {
1005 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1006 continue;
1007 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1008 if (len >= sizeof(buf)) {
1009 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1010 (unsigned long)len, (unsigned long)sizeof(buf));
1011 continue;
1012 }
1013 sprintf(buf, "%s/%s", path, dentry->d_name);
1014 if (lstat(buf, &st) != -1) {
1015 if (S_ISREG(st.st_mode))
1016 scanelf_file(buf);
1017 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1018 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1019 scanelf_dir(buf);
1020 }
1021 }
1022 }
1023 closedir(dir);
1024 }
1025
1026 static int scanelf_from_file(char *filename)
1027 {
1028 FILE *fp = NULL;
1029 char *p;
1030 char path[_POSIX_PATH_MAX];
1031
1032 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1033 fp = stdin;
1034 else if ((fp = fopen(filename, "r")) == NULL)
1035 return 1;
1036
1037 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1038 if ((p = strchr(path, '\n')) != NULL)
1039 *p = 0;
1040 search_path = path;
1041 scanelf_dir(path);
1042 }
1043 if (fp != stdin)
1044 fclose(fp);
1045 return 0;
1046 }
1047
1048 static void load_ld_so_conf()
1049 {
1050 FILE *fp = NULL;
1051 char *p;
1052 char path[_POSIX_PATH_MAX];
1053 int i = 0;
1054
1055 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1056 return;
1057
1058 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1059 if (*path != '/')
1060 continue;
1061
1062 if ((p = strrchr(path, '\r')) != NULL)
1063 *p = 0;
1064 if ((p = strchr(path, '\n')) != NULL)
1065 *p = 0;
1066
1067 ldpaths[i++] = xstrdup(path);
1068
1069 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1070 break;
1071 }
1072 ldpaths[i] = NULL;
1073
1074 fclose(fp);
1075 }
1076
1077 /* scan /etc/ld.so.conf for paths */
1078 static void scanelf_ldpath()
1079 {
1080 char scan_l, scan_ul, scan_ull;
1081 int i = 0;
1082
1083 if (!ldpaths[0])
1084 err("Unable to load any paths from ld.so.conf");
1085
1086 scan_l = scan_ul = scan_ull = 0;
1087
1088 while (ldpaths[i]) {
1089 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1090 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1091 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1092 scanelf_dir(ldpaths[i]);
1093 ++i;
1094 }
1095
1096 if (!scan_l) scanelf_dir("/lib");
1097 if (!scan_ul) scanelf_dir("/usr/lib");
1098 if (!scan_ull) scanelf_dir("/usr/local/lib");
1099 }
1100
1101 /* scan env PATH for paths */
1102 static void scanelf_envpath()
1103 {
1104 char *path, *p;
1105
1106 path = getenv("PATH");
1107 if (!path)
1108 err("PATH is not set in your env !");
1109 path = xstrdup(path);
1110
1111 while ((p = strrchr(path, ':')) != NULL) {
1112 scanelf_dir(p + 1);
1113 *p = 0;
1114 }
1115
1116 free(path);
1117 }
1118
1119
1120 /* usage / invocation handling functions */
1121 #define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV"
1122 #define a_argument required_argument
1123 static struct option const long_opts[] = {
1124 {"path", no_argument, NULL, 'p'},
1125 {"ldpath", no_argument, NULL, 'l'},
1126 {"recursive", no_argument, NULL, 'R'},
1127 {"mount", no_argument, NULL, 'm'},
1128 {"symlink", no_argument, NULL, 'y'},
1129 {"pax", no_argument, NULL, 'x'},
1130 {"header", no_argument, NULL, 'e'},
1131 {"textrel", no_argument, NULL, 't'},
1132 {"rpath", no_argument, NULL, 'r'},
1133 {"needed", no_argument, NULL, 'n'},
1134 {"ldcache", no_argument, NULL, 'L'},
1135 {"interp", no_argument, NULL, 'i'},
1136 {"bind", no_argument, NULL, 'b'},
1137 {"soname", no_argument, NULL, 'S'},
1138 {"symbol", a_argument, NULL, 's'},
1139 {"lib", a_argument, NULL, 'N'},
1140 {"gmatch", no_argument, NULL, 'g'},
1141 {"textrels", no_argument, NULL, 'T'},
1142 {"all", no_argument, NULL, 'a'},
1143 {"quiet", no_argument, NULL, 'q'},
1144 {"verbose", no_argument, NULL, 'v'},
1145 {"format", a_argument, NULL, 'F'},
1146 {"from", a_argument, NULL, 'f'},
1147 {"file", a_argument, NULL, 'o'},
1148 {"nobanner", no_argument, NULL, 'B'},
1149 {"help", no_argument, NULL, 'h'},
1150 {"version", no_argument, NULL, 'V'},
1151 {NULL, no_argument, NULL, 0x0}
1152 };
1153
1154 static const char *opts_help[] = {
1155 "Scan all directories in PATH environment",
1156 "Scan all directories in /etc/ld.so.conf",
1157 "Scan directories recursively",
1158 "Don't recursively cross mount points",
1159 "Don't scan symlinks\n",
1160 "Print PaX markings",
1161 "Print GNU_STACK/PT_LOAD markings",
1162 "Print TEXTREL information",
1163 "Print RPATH information",
1164 "Print NEEDED information",
1165 "Resolve NEEDED information (use with -n)",
1166 "Print INTERP information",
1167 "Print BIND information",
1168 "Print SONAME information",
1169 "Find a specified symbol",
1170 "Find a specified library",
1171 "Use strncmp to match libraries. (use with -N)",
1172 "Locate cause of TEXTREL",
1173 "Print all scanned info (-x -e -t -r -b)\n",
1174 "Only output 'bad' things",
1175 "Be verbose (can be specified more than once)",
1176 "Use specified format for output",
1177 "Read input stream from a filename",
1178 "Write output stream to a filename",
1179 "Don't display the header",
1180 "Print this help and exit",
1181 "Print version and exit",
1182 NULL
1183 };
1184
1185 /* display usage and exit */
1186 static void usage(int status)
1187 {
1188 unsigned long i;
1189 printf("* Scan ELF binaries for stuff\n\n"
1190 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1191 printf("Options: -[%s]\n", PARSE_FLAGS);
1192 for (i = 0; long_opts[i].name; ++i)
1193 if (long_opts[i].has_arg == no_argument)
1194 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1195 long_opts[i].name, opts_help[i]);
1196 else
1197 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1198 long_opts[i].name, opts_help[i]);
1199
1200 if (status != EXIT_SUCCESS)
1201 exit(status);
1202
1203 puts("\nThe format modifiers for the -F option are:");
1204 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1205 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1206 puts(" i INTERP \tb BIND \ts symbol");
1207 puts(" N library \to Type \tT TEXTRELs");
1208 puts(" S SONAME");
1209 puts(" p filename (with search path removed)");
1210 puts(" f filename (short name/basename)");
1211 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1212
1213 exit(status);
1214 }
1215
1216 /* parse command line arguments and preform needed actions */
1217 static void parseargs(int argc, char *argv[])
1218 {
1219 int i;
1220 char *from_file = NULL;
1221
1222 opterr = 0;
1223 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1224 switch (i) {
1225
1226 case 'V':
1227 printf("pax-utils-%s: %s compiled %s\n%s\n"
1228 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1229 VERSION, __FILE__, __DATE__, rcsid, argv0);
1230 exit(EXIT_SUCCESS);
1231 break;
1232 case 'h': usage(EXIT_SUCCESS); break;
1233 case 'f':
1234 if (from_file) err("Don't specify -f twice");
1235 from_file = xstrdup(optarg);
1236 break;
1237 case 'o': {
1238 FILE *fp = NULL;
1239 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1240 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1241 SET_STDOUT(fp);
1242 break;
1243 }
1244
1245 case 's': {
1246 if (find_sym) warn("You prob don't want to specify -s twice");
1247 find_sym = optarg;
1248 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1249 sprintf(versioned_symname, "%s@", find_sym);
1250 break;
1251 }
1252 case 'N': {
1253 if (find_lib) warn("You prob don't want to specify -N twice");
1254 find_lib = optarg;
1255 break;
1256 }
1257
1258 case 'F': {
1259 if (out_format) warn("You prob don't want to specify -F twice");
1260 out_format = optarg;
1261 break;
1262 }
1263
1264 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1265 case 'L': printcache = 1; break;
1266 case 'y': scan_symlink = 0; break;
1267 case 'B': show_banner = 0; break;
1268 case 'l': scan_ldpath = 1; break;
1269 case 'p': scan_envpath = 1; break;
1270 case 'R': dir_recurse = 1; break;
1271 case 'm': dir_crossmount = 0; break;
1272 case 'x': show_pax = 1; break;
1273 case 'e': show_phdr = 1; break;
1274 case 't': show_textrel = 1; break;
1275 case 'r': show_rpath = 1; break;
1276 case 'n': show_needed = 1; break;
1277 case 'i': show_interp = 1; break;
1278 case 'b': show_bind = 1; break;
1279 case 'S': show_soname = 1; break;
1280 case 'T': show_textrels = 1; break;
1281 case 'q': be_quiet = 1; break;
1282 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1283 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1284
1285 case ':':
1286 err("Option missing parameter\n");
1287 case '?':
1288 err("Unknown option\n");
1289 default:
1290 err("Unhandled option '%c'", i);
1291 }
1292 }
1293
1294 /* let the format option override all other options */
1295 if (out_format) {
1296 show_pax = show_phdr = show_textrel = show_rpath = \
1297 show_needed = show_interp = show_bind = show_soname = \
1298 show_textrels = 0;
1299 for (i = 0; out_format[i]; ++i) {
1300 if (!IS_MODIFIER(out_format[i])) continue;
1301
1302 switch (out_format[++i]) {
1303 case '%': break;
1304 case '#': break;
1305 case 'F': break;
1306 case 'p': break;
1307 case 'f': break;
1308 case 's': break;
1309 case 'N': break;
1310 case 'o': break;
1311 case 'x': show_pax = 1; break;
1312 case 'e': show_phdr = 1; break;
1313 case 't': show_textrel = 1; break;
1314 case 'r': show_rpath = 1; break;
1315 case 'n': show_needed = 1; break;
1316 case 'i': show_interp = 1; break;
1317 case 'b': show_bind = 1; break;
1318 case 'S': show_soname = 1; break;
1319 case 'T': show_textrels = 1; break;
1320 default:
1321 err("Invalid format specifier '%c' (byte %i)",
1322 out_format[i], i+1);
1323 }
1324 }
1325
1326 /* construct our default format */
1327 } else {
1328 size_t fmt_len = 30;
1329 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1330 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1331 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1332 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1333 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1334 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1335 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1336 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1337 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1338 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1339 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1340 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1341 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1342 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1343 }
1344 if (be_verbose > 2) printf("Format: %s\n", out_format);
1345
1346 /* now lets actually do the scanning */
1347 if (scan_ldpath || (show_rpath && be_quiet))
1348 load_ld_so_conf();
1349 if (scan_ldpath) scanelf_ldpath();
1350 if (scan_envpath) scanelf_envpath();
1351 if (from_file) {
1352 scanelf_from_file(from_file);
1353 free(from_file);
1354 from_file = *argv;
1355 }
1356 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1357 err("Nothing to scan !?");
1358 while (optind < argc) {
1359 search_path = argv[optind++];
1360 scanelf_dir(search_path);
1361 }
1362
1363 /* clean up */
1364 if (versioned_symname) free(versioned_symname);
1365 for (i = 0; ldpaths[i]; ++i)
1366 free(ldpaths[i]);
1367
1368 if (ldcache != 0)
1369 munmap(ldcache, ldcache_size);
1370 }
1371
1372
1373
1374 /* utility funcs */
1375 static char *xstrdup(const char *s)
1376 {
1377 char *ret = strdup(s);
1378 if (!ret) err("Could not strdup(): %s", strerror(errno));
1379 return ret;
1380 }
1381 static void *xmalloc(size_t size)
1382 {
1383 void *ret = malloc(size);
1384 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1385 return ret;
1386 }
1387 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1388 {
1389 size_t new_len;
1390
1391 new_len = strlen(*dst) + strlen(src);
1392 if (*curr_len <= new_len) {
1393 *curr_len = new_len + (*curr_len / 2);
1394 *dst = realloc(*dst, *curr_len);
1395 if (!*dst)
1396 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1397 }
1398
1399 if (n)
1400 strncat(*dst, src, n);
1401 else
1402 strcat(*dst, src);
1403 }
1404 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1405 {
1406 static char my_app[2];
1407 my_app[0] = append;
1408 my_app[1] = '\0';
1409 xstrcat(dst, my_app, curr_len);
1410 }
1411
1412
1413
1414 int main(int argc, char *argv[])
1415 {
1416 if (argc < 2)
1417 usage(EXIT_FAILURE);
1418 parseargs(argc, argv);
1419 fclose(stdout);
1420 #ifdef __BOUNDS_CHECKING_ON
1421 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1422 #endif
1423 return EXIT_SUCCESS;
1424 }

  ViewVC Help
Powered by ViewVC 1.1.20