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Revision 1.96 - (show annotations) (download) (as text)
Wed Dec 28 22:26:47 2005 UTC (8 years, 3 months ago) by solar
Branch: MAIN
Changes since 1.95: +84 -5 lines
File MIME type: text/x-csrc
- initial function to do ld.so.cache lookups for DT_NEEDED entries

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 1.95 2005/12/10 06:08:22 vapier 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 1.95 2005/12/10 06:08:22 vapier 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
494 static char *lookup_cache_lib(char *);
495 static char *lookup_cache_lib(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
509 typedef struct {
510 int flags;
511 int sooffset;
512 int liboffset;
513 } libentry_t;
514
515 header_t *header;
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)) < 0)
523 return NULL;
524 /* save the cache size for latter unmapping */
525 ldcache_size = st.st_size;
526
527 if ((ldcache = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == (caddr_t) -1)
528 return NULL;
529
530 close(fd);
531
532 if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
533 return NULL;
534
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 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
545 continue;
546 strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
547 }
548 return buf;
549 }
550
551
552 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
553 {
554 unsigned long i;
555 char *needed;
556 void *strtbl_void;
557 char *p;
558
559 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
560
561 strtbl_void = elf_findsecbyname(elf, ".dynstr");
562
563 if (elf->phdr && strtbl_void) {
564 #define SHOW_NEEDED(B) \
565 if (elf->elf_class == ELFCLASS ## B) { \
566 Elf ## B ## _Dyn *dyn; \
567 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
568 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
569 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
570 Elf ## B ## _Off offset; \
571 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
572 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
573 offset = EGET(phdr[i].p_offset); \
574 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
575 dyn = DYN ## B (elf->data + offset); \
576 while (EGET(dyn->d_tag) != DT_NULL) { \
577 if (EGET(dyn->d_tag) == DT_NEEDED) { \
578 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
579 if (offset >= (Elf ## B ## _Off)elf->len) { \
580 ++dyn; \
581 continue; \
582 } \
583 needed = (char*)(elf->data + offset); \
584 if (op == 0) { \
585 if (!be_wewy_wewy_quiet) { \
586 if (*found_needed) xchrcat(ret, ',', ret_len); \
587 if (printcache) \
588 if ((p = lookup_cache_lib(needed)) != NULL) \
589 needed = p; \
590 xstrcat(ret, needed, ret_len); \
591 } \
592 *found_needed = 1; \
593 } else { \
594 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
595 *found_lib = 1; \
596 return (be_wewy_wewy_quiet ? NULL : needed); \
597 } \
598 } \
599 } \
600 ++dyn; \
601 } \
602 } }
603 SHOW_NEEDED(32)
604 SHOW_NEEDED(64)
605 if (op == 0 && !*found_needed && be_verbose)
606 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
607 }
608
609 return NULL;
610 }
611 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
612 {
613 void *strtbl_void;
614
615 if (!show_interp) return NULL;
616
617 strtbl_void = elf_findsecbyname(elf, ".interp");
618
619 if (strtbl_void) {
620 #define SHOW_INTERP(B) \
621 if (elf->elf_class == ELFCLASS ## B) { \
622 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
623 *found_interp = 1; \
624 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
625 }
626 SHOW_INTERP(32)
627 SHOW_INTERP(64)
628 }
629 return NULL;
630 }
631 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
632 {
633 unsigned long i;
634 struct stat s;
635
636 if (!show_bind) return NULL;
637 if (!elf->phdr) return NULL;
638
639 #define SHOW_BIND(B) \
640 if (elf->elf_class == ELFCLASS ## B) { \
641 Elf ## B ## _Dyn *dyn; \
642 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
643 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
644 Elf ## B ## _Off offset; \
645 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
646 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
647 offset = EGET(phdr[i].p_offset); \
648 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
649 dyn = DYN ## B (elf->data + offset); \
650 while (EGET(dyn->d_tag) != DT_NULL) { \
651 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
652 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
653 { \
654 if (be_quiet) return NULL; \
655 *found_bind = 1; \
656 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
657 } \
658 ++dyn; \
659 } \
660 } \
661 }
662 SHOW_BIND(32)
663 SHOW_BIND(64)
664
665 if (be_wewy_wewy_quiet) return NULL;
666
667 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
668 return NULL;
669 } else {
670 *found_bind = 1;
671 return (char *) "LAZY";
672 }
673 }
674 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
675 {
676 unsigned long i;
677 char *soname;
678 void *strtbl_void;
679
680 if (!show_soname) return NULL;
681
682 strtbl_void = elf_findsecbyname(elf, ".dynstr");
683
684 if (elf->phdr && strtbl_void) {
685 #define SHOW_SONAME(B) \
686 if (elf->elf_class == ELFCLASS ## B) { \
687 Elf ## B ## _Dyn *dyn; \
688 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
689 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
690 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
691 Elf ## B ## _Off offset; \
692 /* only look for soname in shared objects */ \
693 if (ehdr->e_type != ET_DYN) \
694 return NULL; \
695 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
696 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
697 offset = EGET(phdr[i].p_offset); \
698 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
699 dyn = DYN ## B (elf->data + offset); \
700 while (EGET(dyn->d_tag) != DT_NULL) { \
701 if (EGET(dyn->d_tag) == DT_SONAME) { \
702 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
703 if (offset >= (Elf ## B ## _Off)elf->len) { \
704 ++dyn; \
705 continue; \
706 } \
707 soname = (char*)(elf->data + offset); \
708 *found_soname = 1; \
709 return (be_wewy_wewy_quiet ? NULL : soname); \
710 } \
711 ++dyn; \
712 } \
713 } }
714 SHOW_SONAME(32)
715 SHOW_SONAME(64)
716 }
717
718 return NULL;
719 }
720 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
721 {
722 unsigned long i;
723 char *ret;
724 void *symtab_void, *strtab_void;
725
726 if (!find_sym) return NULL;
727 ret = find_sym;
728
729 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
730
731 if (symtab_void && strtab_void) {
732 #define FIND_SYM(B) \
733 if (elf->elf_class == ELFCLASS ## B) { \
734 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
735 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
736 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
737 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
738 char *symname; \
739 for (i = 0; i < cnt; ++i) { \
740 if (sym->st_name) { \
741 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
742 if (*find_sym == '*') { \
743 printf("%s(%s) %5lX %15s %s\n", \
744 ((*found_sym == 0) ? "\n\t" : "\t"), \
745 elf->base_filename, \
746 (unsigned long)sym->st_size, \
747 get_elfstttype(sym->st_info), \
748 symname); \
749 *found_sym = 1; \
750 } else { \
751 char *this_sym, *next_sym; \
752 this_sym = find_sym; \
753 do { \
754 next_sym = strchr(this_sym, ','); \
755 if (next_sym == NULL) \
756 next_sym = this_sym + strlen(this_sym); \
757 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
758 (strcmp(symname, versioned_symname) == 0)) { \
759 ret = this_sym; \
760 (*found_sym)++; \
761 goto break_out; \
762 } \
763 this_sym = next_sym + 1; \
764 } while (*next_sym != '\0'); \
765 } \
766 } \
767 ++sym; \
768 } }
769 FIND_SYM(32)
770 FIND_SYM(64)
771 }
772
773 break_out:
774 if (be_wewy_wewy_quiet) return NULL;
775
776 if (*find_sym != '*' && *found_sym)
777 return ret;
778 if (be_quiet)
779 return NULL;
780 else
781 return (char *)" - ";
782 }
783 /* scan an elf file and show all the fun stuff */
784 #define prints(str) write(fileno(stdout), str, strlen(str))
785 static void scanelf_file(const char *filename)
786 {
787 unsigned long i;
788 char found_pax, found_phdr, found_relro, found_load, found_textrel,
789 found_rpath, found_needed, found_interp, found_bind, found_soname,
790 found_sym, found_lib, found_file, found_textrels;
791 elfobj *elf;
792 struct stat st;
793 static char *out_buffer = NULL;
794 static size_t out_len;
795
796 /* make sure 'filename' exists */
797 if (lstat(filename, &st) == -1) {
798 if (be_verbose > 2) printf("%s: does not exist\n", filename);
799 return;
800 }
801 /* always handle regular files and handle symlinked files if no -y */
802 if (S_ISLNK(st.st_mode)) {
803 if (!scan_symlink) return;
804 stat(filename, &st);
805 }
806 if (!S_ISREG(st.st_mode)) {
807 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
808 return;
809 }
810
811 found_pax = found_phdr = found_relro = found_load = found_textrel = \
812 found_rpath = found_needed = found_interp = found_bind = found_soname = \
813 found_sym = found_lib = found_file = found_textrels = 0;
814
815 /* verify this is real ELF */
816 if ((elf = readelf(filename)) == NULL) {
817 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
818 return;
819 }
820
821 if (be_verbose > 1)
822 printf("%s: scanning file {%s,%s}\n", filename,
823 get_elfeitype(EI_CLASS, elf->elf_class),
824 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
825 else if (be_verbose)
826 printf("%s: scanning file\n", filename);
827
828 /* init output buffer */
829 if (!out_buffer) {
830 out_len = sizeof(char) * 80;
831 out_buffer = (char*)xmalloc(out_len);
832 }
833 *out_buffer = '\0';
834
835 /* show the header */
836 if (!be_quiet && show_banner) {
837 for (i = 0; out_format[i]; ++i) {
838 if (!IS_MODIFIER(out_format[i])) continue;
839
840 switch (out_format[++i]) {
841 case '%': break;
842 case '#': break;
843 case 'F':
844 case 'p':
845 case 'f': prints("FILE "); found_file = 1; break;
846 case 'o': prints(" TYPE "); break;
847 case 'x': prints(" PAX "); break;
848 case 'e': prints("STK/REL/PTL "); break;
849 case 't': prints("TEXTREL "); break;
850 case 'r': prints("RPATH "); break;
851 case 'n': prints("NEEDED "); break;
852 case 'i': prints("INTERP "); break;
853 case 'b': prints("BIND "); break;
854 case 'S': prints("SONAME "); break;
855 case 's': prints("SYM "); break;
856 case 'N': prints("LIB "); break;
857 case 'T': prints("TEXTRELS "); break;
858 default: warnf("'%c' has no title ?", out_format[i]);
859 }
860 }
861 if (!found_file) prints("FILE ");
862 prints("\n");
863 found_file = 0;
864 show_banner = 0;
865 }
866
867 /* dump all the good stuff */
868 for (i = 0; out_format[i]; ++i) {
869 const char *out;
870 const char *tmp;
871
872 /* make sure we trim leading spaces in quiet mode */
873 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
874 *out_buffer = '\0';
875
876 if (!IS_MODIFIER(out_format[i])) {
877 xchrcat(&out_buffer, out_format[i], &out_len);
878 continue;
879 }
880
881 out = NULL;
882 be_wewy_wewy_quiet = (out_format[i] == '#');
883 switch (out_format[++i]) {
884 case '%':
885 case '#':
886 xchrcat(&out_buffer, out_format[i], &out_len); break;
887 case 'F':
888 found_file = 1;
889 if (be_wewy_wewy_quiet) break;
890 xstrcat(&out_buffer, filename, &out_len);
891 break;
892 case 'p':
893 found_file = 1;
894 if (be_wewy_wewy_quiet) break;
895 tmp = filename;
896 if (search_path) {
897 ssize_t len_search = strlen(search_path);
898 ssize_t len_file = strlen(filename);
899 if (!strncmp(filename, search_path, len_search) && \
900 len_file > len_search)
901 tmp += len_search;
902 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
903 }
904 xstrcat(&out_buffer, tmp, &out_len);
905 break;
906 case 'f':
907 found_file = 1;
908 if (be_wewy_wewy_quiet) break;
909 tmp = strrchr(filename, '/');
910 tmp = (tmp == NULL ? filename : tmp+1);
911 xstrcat(&out_buffer, tmp, &out_len);
912 break;
913 case 'o': out = get_elfetype(elf); break;
914 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
915 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
916 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
917 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
918 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
919 case 'n':
920 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
921 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
922 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
923 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
924 case 's': out = scanelf_file_sym(elf, &found_sym); break;
925 default: warnf("'%c' has no scan code?", out_format[i]);
926 }
927 if (out) {
928 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
929 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
930 xstrncat(&out_buffer, out, &out_len, (tmp-out));
931 else
932 xstrcat(&out_buffer, out, &out_len);
933 }
934 }
935
936 #define FOUND_SOMETHING() \
937 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
938 found_rpath || found_needed || found_interp || found_bind || \
939 found_soname || found_sym || found_lib || found_textrels)
940
941 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
942 xchrcat(&out_buffer, ' ', &out_len);
943 xstrcat(&out_buffer, filename, &out_len);
944 }
945 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
946 puts(out_buffer);
947 fflush(stdout);
948 }
949
950 unreadelf(elf);
951 }
952
953 /* scan a directory for ET_EXEC files and print when we find one */
954 static void scanelf_dir(const char *path)
955 {
956 register DIR *dir;
957 register struct dirent *dentry;
958 struct stat st_top, st;
959 char buf[_POSIX_PATH_MAX];
960 size_t pathlen = 0, len = 0;
961
962 /* make sure path exists */
963 if (lstat(path, &st_top) == -1) {
964 if (be_verbose > 2) printf("%s: does not exist\n", path);
965 return;
966 }
967
968 /* ok, if it isn't a directory, assume we can open it */
969 if (!S_ISDIR(st_top.st_mode)) {
970 scanelf_file(path);
971 return;
972 }
973
974 /* now scan the dir looking for fun stuff */
975 if ((dir = opendir(path)) == NULL) {
976 warnf("could not opendir %s: %s", path, strerror(errno));
977 return;
978 }
979 if (be_verbose) printf("%s: scanning dir\n", path);
980
981 pathlen = strlen(path);
982 while ((dentry = readdir(dir))) {
983 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
984 continue;
985 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
986 if (len >= sizeof(buf)) {
987 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
988 (unsigned long)len, (unsigned long)sizeof(buf));
989 continue;
990 }
991 sprintf(buf, "%s/%s", path, dentry->d_name);
992 if (lstat(buf, &st) != -1) {
993 if (S_ISREG(st.st_mode))
994 scanelf_file(buf);
995 else if (dir_recurse && S_ISDIR(st.st_mode)) {
996 if (dir_crossmount || (st_top.st_dev == st.st_dev))
997 scanelf_dir(buf);
998 }
999 }
1000 }
1001 closedir(dir);
1002 }
1003
1004 static int scanelf_from_file(char *filename)
1005 {
1006 FILE *fp = NULL;
1007 char *p;
1008 char path[_POSIX_PATH_MAX];
1009
1010 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1011 fp = stdin;
1012 else if ((fp = fopen(filename, "r")) == NULL)
1013 return 1;
1014
1015 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1016 if ((p = strchr(path, '\n')) != NULL)
1017 *p = 0;
1018 search_path = path;
1019 scanelf_dir(path);
1020 }
1021 if (fp != stdin)
1022 fclose(fp);
1023 return 0;
1024 }
1025
1026 static void load_ld_so_conf()
1027 {
1028 FILE *fp = NULL;
1029 char *p;
1030 char path[_POSIX_PATH_MAX];
1031 int i = 0;
1032
1033 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1034 return;
1035
1036 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
1037 if (*path != '/')
1038 continue;
1039
1040 if ((p = strrchr(path, '\r')) != NULL)
1041 *p = 0;
1042 if ((p = strchr(path, '\n')) != NULL)
1043 *p = 0;
1044
1045 ldpaths[i++] = xstrdup(path);
1046
1047 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1048 break;
1049 }
1050 ldpaths[i] = NULL;
1051
1052 fclose(fp);
1053 }
1054
1055 /* scan /etc/ld.so.conf for paths */
1056 static void scanelf_ldpath()
1057 {
1058 char scan_l, scan_ul, scan_ull;
1059 int i = 0;
1060
1061 if (!ldpaths[0])
1062 err("Unable to load any paths from ld.so.conf");
1063
1064 scan_l = scan_ul = scan_ull = 0;
1065
1066 while (ldpaths[i]) {
1067 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1068 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1069 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1070 scanelf_dir(ldpaths[i]);
1071 ++i;
1072 }
1073
1074 if (!scan_l) scanelf_dir("/lib");
1075 if (!scan_ul) scanelf_dir("/usr/lib");
1076 if (!scan_ull) scanelf_dir("/usr/local/lib");
1077 }
1078
1079 /* scan env PATH for paths */
1080 static void scanelf_envpath()
1081 {
1082 char *path, *p;
1083
1084 path = getenv("PATH");
1085 if (!path)
1086 err("PATH is not set in your env !");
1087 path = xstrdup(path);
1088
1089 while ((p = strrchr(path, ':')) != NULL) {
1090 scanelf_dir(p + 1);
1091 *p = 0;
1092 }
1093
1094 free(path);
1095 }
1096
1097
1098 /* usage / invocation handling functions */
1099 #define PARSE_FLAGS "plRmyxetrnLibSs:gN:TaqvF:f:o:BhV"
1100 #define a_argument required_argument
1101 static struct option const long_opts[] = {
1102 {"path", no_argument, NULL, 'p'},
1103 {"ldpath", no_argument, NULL, 'l'},
1104 {"recursive", no_argument, NULL, 'R'},
1105 {"mount", no_argument, NULL, 'm'},
1106 {"symlink", no_argument, NULL, 'y'},
1107 {"pax", no_argument, NULL, 'x'},
1108 {"header", no_argument, NULL, 'e'},
1109 {"textrel", no_argument, NULL, 't'},
1110 {"rpath", no_argument, NULL, 'r'},
1111 {"needed", no_argument, NULL, 'n'},
1112 {"ldcache", no_argument, NULL, 'L'},
1113 {"interp", no_argument, NULL, 'i'},
1114 {"bind", no_argument, NULL, 'b'},
1115 {"soname", no_argument, NULL, 'S'},
1116 {"symbol", a_argument, NULL, 's'},
1117 {"lib", a_argument, NULL, 'N'},
1118 {"gmatch", no_argument, NULL, 'g'},
1119 {"textrels", no_argument, NULL, 'T'},
1120 {"all", no_argument, NULL, 'a'},
1121 {"quiet", no_argument, NULL, 'q'},
1122 {"verbose", no_argument, NULL, 'v'},
1123 {"format", a_argument, NULL, 'F'},
1124 {"from", a_argument, NULL, 'f'},
1125 {"file", a_argument, NULL, 'o'},
1126 {"nobanner", no_argument, NULL, 'B'},
1127 {"help", no_argument, NULL, 'h'},
1128 {"version", no_argument, NULL, 'V'},
1129 {NULL, no_argument, NULL, 0x0}
1130 };
1131
1132 static const char *opts_help[] = {
1133 "Scan all directories in PATH environment",
1134 "Scan all directories in /etc/ld.so.conf",
1135 "Scan directories recursively",
1136 "Don't recursively cross mount points",
1137 "Don't scan symlinks\n",
1138 "Print PaX markings",
1139 "Print GNU_STACK/PT_LOAD markings",
1140 "Print TEXTREL information",
1141 "Print RPATH information",
1142 "Print NEEDED information",
1143 "Resolve NEEDED information (use with -n)",
1144 "Print INTERP information",
1145 "Print BIND information",
1146 "Print SONAME information",
1147 "Find a specified symbol",
1148 "Find a specified library",
1149 "Use strncmp to match libraries. (use with -N)",
1150 "Locate cause of TEXTREL",
1151 "Print all scanned info (-x -e -t -r -b)\n",
1152 "Only output 'bad' things",
1153 "Be verbose (can be specified more than once)",
1154 "Use specified format for output",
1155 "Read input stream from a filename",
1156 "Write output stream to a filename",
1157 "Don't display the header",
1158 "Print this help and exit",
1159 "Print version and exit",
1160 NULL
1161 };
1162
1163 /* display usage and exit */
1164 static void usage(int status)
1165 {
1166 unsigned long i;
1167 printf("* Scan ELF binaries for stuff\n\n"
1168 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1169 printf("Options: -[%s]\n", PARSE_FLAGS);
1170 for (i = 0; long_opts[i].name; ++i)
1171 if (long_opts[i].has_arg == no_argument)
1172 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1173 long_opts[i].name, opts_help[i]);
1174 else
1175 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1176 long_opts[i].name, opts_help[i]);
1177
1178 if (status != EXIT_SUCCESS)
1179 exit(status);
1180
1181 puts("\nThe format modifiers for the -F option are:");
1182 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1183 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1184 puts(" i INTERP \tb BIND \ts symbol");
1185 puts(" N library \to Type \tT TEXTRELs");
1186 puts(" S SONAME");
1187 puts(" p filename (with search path removed)");
1188 puts(" f filename (short name/basename)");
1189 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1190
1191 exit(status);
1192 }
1193
1194 /* parse command line arguments and preform needed actions */
1195 static void parseargs(int argc, char *argv[])
1196 {
1197 int i;
1198 char *from_file = NULL;
1199
1200 opterr = 0;
1201 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1202 switch (i) {
1203
1204 case 'V':
1205 printf("pax-utils-%s: %s compiled %s\n%s\n"
1206 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1207 VERSION, __FILE__, __DATE__, rcsid, argv0);
1208 exit(EXIT_SUCCESS);
1209 break;
1210 case 'h': usage(EXIT_SUCCESS); break;
1211 case 'f':
1212 if (from_file) err("Don't specify -f twice");
1213 from_file = xstrdup(optarg);
1214 break;
1215 case 'o': {
1216 FILE *fp = NULL;
1217 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1218 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1219 SET_STDOUT(fp);
1220 break;
1221 }
1222
1223 case 's': {
1224 if (find_sym) warn("You prob don't want to specify -s twice");
1225 find_sym = optarg;
1226 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1227 sprintf(versioned_symname, "%s@", find_sym);
1228 break;
1229 }
1230 case 'N': {
1231 if (find_lib) warn("You prob don't want to specify -N twice");
1232 find_lib = optarg;
1233 break;
1234 }
1235
1236 case 'F': {
1237 if (out_format) warn("You prob don't want to specify -F twice");
1238 out_format = optarg;
1239 break;
1240 }
1241
1242 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1243 case 'L': printcache = 1; break;
1244 case 'y': scan_symlink = 0; break;
1245 case 'B': show_banner = 0; break;
1246 case 'l': scan_ldpath = 1; break;
1247 case 'p': scan_envpath = 1; break;
1248 case 'R': dir_recurse = 1; break;
1249 case 'm': dir_crossmount = 0; break;
1250 case 'x': show_pax = 1; break;
1251 case 'e': show_phdr = 1; break;
1252 case 't': show_textrel = 1; break;
1253 case 'r': show_rpath = 1; break;
1254 case 'n': show_needed = 1; break;
1255 case 'i': show_interp = 1; break;
1256 case 'b': show_bind = 1; break;
1257 case 'S': show_soname = 1; break;
1258 case 'T': show_textrels = 1; break;
1259 case 'q': be_quiet = 1; break;
1260 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1261 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1262
1263 case ':':
1264 err("Option missing parameter\n");
1265 case '?':
1266 err("Unknown option\n");
1267 default:
1268 err("Unhandled option '%c'", i);
1269 }
1270 }
1271
1272 /* let the format option override all other options */
1273 if (out_format) {
1274 show_pax = show_phdr = show_textrel = show_rpath = \
1275 show_needed = show_interp = show_bind = show_soname = \
1276 show_textrels = 0;
1277 for (i = 0; out_format[i]; ++i) {
1278 if (!IS_MODIFIER(out_format[i])) continue;
1279
1280 switch (out_format[++i]) {
1281 case '%': break;
1282 case '#': break;
1283 case 'F': break;
1284 case 'p': break;
1285 case 'f': break;
1286 case 's': break;
1287 case 'N': break;
1288 case 'o': break;
1289 case 'x': show_pax = 1; break;
1290 case 'e': show_phdr = 1; break;
1291 case 't': show_textrel = 1; break;
1292 case 'r': show_rpath = 1; break;
1293 case 'n': show_needed = 1; break;
1294 case 'i': show_interp = 1; break;
1295 case 'b': show_bind = 1; break;
1296 case 'S': show_soname = 1; break;
1297 case 'T': show_textrels = 1; break;
1298 default:
1299 err("Invalid format specifier '%c' (byte %i)",
1300 out_format[i], i+1);
1301 }
1302 }
1303
1304 /* construct our default format */
1305 } else {
1306 size_t fmt_len = 30;
1307 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1308 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1309 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1310 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1311 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1312 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1313 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1314 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1315 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1316 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1317 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1318 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1319 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1320 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1321 }
1322 if (be_verbose > 2) printf("Format: %s\n", out_format);
1323
1324 /* now lets actually do the scanning */
1325 if (scan_ldpath || (show_rpath && be_quiet))
1326 load_ld_so_conf();
1327 if (scan_ldpath) scanelf_ldpath();
1328 if (scan_envpath) scanelf_envpath();
1329 if (from_file) {
1330 scanelf_from_file(from_file);
1331 free(from_file);
1332 from_file = *argv;
1333 }
1334 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1335 err("Nothing to scan !?");
1336 while (optind < argc) {
1337 search_path = argv[optind++];
1338 scanelf_dir(search_path);
1339 }
1340
1341 /* clean up */
1342 if (versioned_symname) free(versioned_symname);
1343 for (i = 0; ldpaths[i]; ++i)
1344 free(ldpaths[i]);
1345
1346 if (ldcache != 0)
1347 munmap(ldcache, ldcache_size);
1348 }
1349
1350
1351
1352 /* utility funcs */
1353 static char *xstrdup(const char *s)
1354 {
1355 char *ret = strdup(s);
1356 if (!ret) err("Could not strdup(): %s", strerror(errno));
1357 return ret;
1358 }
1359 static void *xmalloc(size_t size)
1360 {
1361 void *ret = malloc(size);
1362 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1363 return ret;
1364 }
1365 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1366 {
1367 size_t new_len;
1368
1369 new_len = strlen(*dst) + strlen(src);
1370 if (*curr_len <= new_len) {
1371 *curr_len = new_len + (*curr_len / 2);
1372 *dst = realloc(*dst, *curr_len);
1373 if (!*dst)
1374 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1375 }
1376
1377 if (n)
1378 strncat(*dst, src, n);
1379 else
1380 strcat(*dst, src);
1381 }
1382 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1383 {
1384 static char my_app[2];
1385 my_app[0] = append;
1386 my_app[1] = '\0';
1387 xstrcat(dst, my_app, curr_len);
1388 }
1389
1390
1391
1392 int main(int argc, char *argv[])
1393 {
1394 if (argc < 2)
1395 usage(EXIT_FAILURE);
1396 parseargs(argc, argv);
1397 fclose(stdout);
1398 #ifdef __BOUNDS_CHECKING_ON
1399 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1400 #endif
1401 return EXIT_SUCCESS;
1402 }

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