/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.95 - (show annotations) (download) (as text)
Sat Dec 10 06:08:22 2005 UTC (8 years, 8 months ago) by vapier
Branch: MAIN
Changes since 1.94: +36 -13 lines
File MIME type: text/x-csrc
add support for scanning for multiple symbols at a time

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 1.93 2005/12/10 04:07:55 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 <dirent.h>
20 #include <getopt.h>
21 #include <assert.h>
22 #include "paxinc.h"
23
24 static const char *rcsid = "$Id: scanelf.c,v 1.93 2005/12/10 04:07:55 vapier Exp $";
25 #define argv0 "scanelf"
26
27 #define IS_MODIFIER(c) (c == '%' || c == '#')
28
29
30
31 /* prototypes */
32 static void scanelf_file(const char *filename);
33 static void scanelf_dir(const char *path);
34 static void scanelf_ldpath();
35 static void scanelf_envpath();
36 static void usage(int status);
37 static void parseargs(int argc, char *argv[]);
38 static char *xstrdup(const char *s);
39 static void *xmalloc(size_t size);
40 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
41 #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
42 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
43
44 /* variables to control behavior */
45 static char *ldpaths[256];
46 static char scan_ldpath = 0;
47 static char scan_envpath = 0;
48 static char scan_symlink = 1;
49 static char dir_recurse = 0;
50 static char dir_crossmount = 1;
51 static char show_pax = 0;
52 static char show_phdr = 0;
53 static char show_textrel = 0;
54 static char show_rpath = 0;
55 static char show_needed = 0;
56 static char show_interp = 0;
57 static char show_bind = 0;
58 static char show_soname = 0;
59 static char show_textrels = 0;
60 static char show_banner = 1;
61 static char be_quiet = 0;
62 static char be_verbose = 0;
63 static char be_wewy_wewy_quiet = 0;
64 static char *find_sym = NULL, *versioned_symname = NULL;
65 static char *find_lib = NULL;
66 static char *out_format = NULL;
67 static char *search_path = NULL;
68 static char gmatch = 0;
69
70
71 /* sub-funcs for scanelf_file() */
72 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
73 {
74 /* find the best SHT_DYNSYM and SHT_STRTAB sections */
75 #define GET_SYMTABS(B) \
76 if (elf->elf_class == ELFCLASS ## B) { \
77 Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
78 /* debug sections */ \
79 symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
80 strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
81 /* runtime sections */ \
82 dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
83 dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
84 if (symtab && dynsym) { \
85 *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
86 } else { \
87 *sym = (void*)(symtab ? symtab : dynsym); \
88 } \
89 if (strtab && dynstr) { \
90 *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
91 } else { \
92 *tab = (void*)(strtab ? strtab : dynstr); \
93 } \
94 }
95 GET_SYMTABS(32)
96 GET_SYMTABS(64)
97 }
98 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
99 {
100 static char ret[7];
101 unsigned long i, shown;
102
103 if (!show_pax) return NULL;
104
105 shown = 0;
106 memset(&ret, 0, sizeof(ret));
107
108 if (elf->phdr) {
109 #define SHOW_PAX(B) \
110 if (elf->elf_class == ELFCLASS ## B) { \
111 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
112 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
113 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
114 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
115 continue; \
116 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
117 continue; \
118 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
119 *found_pax = 1; \
120 ++shown; \
121 break; \
122 } \
123 }
124 SHOW_PAX(32)
125 SHOW_PAX(64)
126 }
127
128 /* fall back to EI_PAX if no PT_PAX was found */
129 if (!*ret) {
130 static char *paxflags;
131 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
132 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
133 *found_pax = 1;
134 return (be_wewy_wewy_quiet ? NULL : paxflags);
135 }
136 strncpy(ret, paxflags, sizeof(ret));
137 }
138
139 if (be_wewy_wewy_quiet || (be_quiet && !shown))
140 return NULL;
141 else
142 return ret;
143 }
144
145 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
146 {
147 static char ret[12];
148 char *found;
149 unsigned long i, shown;
150 unsigned char multi_stack, multi_relro, multi_load;
151
152 if (!show_phdr) return NULL;
153
154 memcpy(ret, "--- --- ---\0", 12);
155
156 shown = 0;
157 multi_stack = multi_relro = multi_load = 0;
158
159 #define SHOW_PHDR(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
162 Elf ## B ## _Off offset; \
163 uint32_t flags, check_flags; \
164 if (elf->phdr != NULL) { \
165 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
166 for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
167 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
168 if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
169 found = found_phdr; \
170 offset = 0; \
171 check_flags = PF_X; \
172 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
173 if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
174 found = found_relro; \
175 offset = 4; \
176 check_flags = PF_X; \
177 } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
178 if (multi_load++ > 2) warnf("%s: more than 2 PT_LOAD's !?", elf->filename); \
179 found = found_load; \
180 offset = 8; \
181 check_flags = PF_W|PF_X; \
182 } else \
183 continue; \
184 flags = EGET(phdr[i].p_flags); \
185 if (be_quiet && ((flags & check_flags) != check_flags)) \
186 continue; \
187 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
188 *found = 1; \
189 ++shown; \
190 } \
191 } else if (elf->shdr != NULL) { \
192 /* no program headers which means this is prob an object file */ \
193 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
194 Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
195 check_flags = SHF_WRITE|SHF_EXECINSTR; \
196 for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
197 if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
198 offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
199 if (!strcmp((char*)(elf->data + offset), ".note.GNU-stack")) { \
200 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
201 flags = EGET(shdr[i].sh_flags); \
202 if (be_quiet && ((flags & check_flags) != check_flags)) \
203 continue; \
204 ++*found_phdr; \
205 shown = 1; \
206 if (flags & SHF_WRITE) ret[0] = 'W'; \
207 if (flags & SHF_ALLOC) ret[1] = 'A'; \
208 if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
209 if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
210 break; \
211 } \
212 } \
213 if (!multi_stack) { \
214 *found_phdr = 1; \
215 shown = 1; \
216 memcpy(ret, "!WX", 3); \
217 } \
218 } \
219 }
220 SHOW_PHDR(32)
221 SHOW_PHDR(64)
222
223 if (be_wewy_wewy_quiet || (be_quiet && !shown))
224 return NULL;
225 else
226 return ret;
227 }
228 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
229 {
230 static const char *ret = "TEXTREL";
231 unsigned long i;
232
233 if (!show_textrel && !show_textrels) return NULL;
234
235 if (elf->phdr) {
236 #define SHOW_TEXTREL(B) \
237 if (elf->elf_class == ELFCLASS ## B) { \
238 Elf ## B ## _Dyn *dyn; \
239 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
240 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
241 Elf ## B ## _Off offset; \
242 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
243 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
244 offset = EGET(phdr[i].p_offset); \
245 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
246 dyn = DYN ## B (elf->data + offset); \
247 while (EGET(dyn->d_tag) != DT_NULL) { \
248 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
249 *found_textrel = 1; \
250 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
251 return (be_wewy_wewy_quiet ? NULL : ret); \
252 } \
253 ++dyn; \
254 } \
255 } }
256 SHOW_TEXTREL(32)
257 SHOW_TEXTREL(64)
258 }
259
260 if (be_quiet || be_wewy_wewy_quiet)
261 return NULL;
262 else
263 return " - ";
264 }
265 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
266 {
267 unsigned long s, r, rmax;
268 void *symtab_void, *strtab_void, *text_void;
269
270 if (!show_textrels) return NULL;
271
272 /* don't search for TEXTREL's if the ELF doesn't have any */
273 if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
274 if (!*found_textrel) return NULL;
275
276 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
277 text_void = elf_findsecbyname(elf, ".text");
278
279 if (symtab_void && strtab_void && text_void && elf->shdr) {
280 #define SHOW_TEXTRELS(B) \
281 if (elf->elf_class == ELFCLASS ## B) { \
282 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
283 Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
284 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
285 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
286 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
287 Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
288 uint ## B ## _t memsz = EGET(text->sh_size); \
289 Elf ## B ## _Rel *rel; \
290 Elf ## B ## _Rela *rela; \
291 /* search the section headers for relocations */ \
292 for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
293 uint32_t sh_type = EGET(shdr[s].sh_type); \
294 if (sh_type == SHT_REL) { \
295 rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
296 rela = NULL; \
297 rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
298 } else if (sh_type == SHT_RELA) { \
299 rel = NULL; \
300 rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
301 rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
302 } else \
303 continue; \
304 /* now see if any of the relocs are in the .text */ \
305 for (r = 0; r < rmax; ++r) { \
306 unsigned long sym_max; \
307 Elf ## B ## _Addr offset_tmp; \
308 Elf ## B ## _Sym *func; \
309 Elf ## B ## _Sym *sym; \
310 Elf ## B ## _Addr r_offset; \
311 uint ## B ## _t r_info; \
312 if (sh_type == SHT_REL) { \
313 r_offset = EGET(rel[r].r_offset); \
314 r_info = EGET(rel[r].r_info); \
315 } else { \
316 r_offset = EGET(rela[r].r_offset); \
317 r_info = EGET(rela[r].r_info); \
318 } \
319 /* make sure this relocation is inside of the .text */ \
320 if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
321 if (be_verbose <= 2) continue; \
322 } else \
323 *found_textrels = 1; \
324 /* locate this relocation symbol name */ \
325 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
326 sym_max = ELF ## B ## _R_SYM(r_info); \
327 if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
328 sym += sym_max; \
329 else \
330 sym = NULL; \
331 sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
332 /* show the raw details about this reloc */ \
333 printf(" %s: ", elf->base_filename); \
334 if (sym && sym->st_name) \
335 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
336 else \
337 printf("(memory/fake?)"); \
338 printf(" [0x%lX]", (unsigned long)r_offset); \
339 /* now try to find the closest symbol that this rel is probably in */ \
340 sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
341 func = NULL; \
342 offset_tmp = 0; \
343 while (sym_max--) { \
344 if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
345 func = sym; \
346 offset_tmp = EGET(sym->st_value); \
347 } \
348 ++sym; \
349 } \
350 printf(" in "); \
351 if (func && func->st_name) \
352 printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
353 else \
354 printf("(NULL: fake?)"); \
355 printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
356 } \
357 } }
358 SHOW_TEXTRELS(32)
359 SHOW_TEXTRELS(64)
360 }
361 if (!*found_textrels)
362 warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
363
364 return NULL;
365 }
366
367 static void rpath_security_checks(elfobj *, char *);
368 static void rpath_security_checks(elfobj *elf, char *item) {
369 struct stat st;
370 switch (*item) {
371 case '/': break;
372 case '.':
373 warnf("Security problem with relative RPATH '%s' in %s", item, elf->filename);
374 break;
375 case '\0':
376 warnf("Security problem NULL RPATH in %s", elf->filename);
377 break;
378 case '$':
379 if (fstat(elf->fd, &st) != -1)
380 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
381 warnf("Security problem with RPATH='%s' in %s with mode set of %o",
382 item, elf->filename, st.st_mode & 07777);
383 break;
384 default:
385 warnf("Maybe? sec problem with RPATH='%s' in %s", item, elf->filename);
386 break;
387 }
388 }
389 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
390 {
391 unsigned long i, s;
392 char *rpath, *runpath, **r;
393 void *strtbl_void;
394
395 if (!show_rpath) return;
396
397 strtbl_void = elf_findsecbyname(elf, ".dynstr");
398 rpath = runpath = NULL;
399
400 if (elf->phdr && strtbl_void) {
401 #define SHOW_RPATH(B) \
402 if (elf->elf_class == ELFCLASS ## B) { \
403 Elf ## B ## _Dyn *dyn; \
404 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
405 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
406 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
407 Elf ## B ## _Off offset; \
408 Elf ## B ## _Xword word; \
409 /* Scan all the program headers */ \
410 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
411 /* Just scan dynamic headers */ \
412 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
413 offset = EGET(phdr[i].p_offset); \
414 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
415 /* Just scan dynamic RPATH/RUNPATH headers */ \
416 dyn = DYN ## B (elf->data + offset); \
417 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
418 if (word == DT_RPATH) { \
419 r = &rpath; \
420 } else if (word == DT_RUNPATH) { \
421 r = &runpath; \
422 } else { \
423 ++dyn; \
424 continue; \
425 } \
426 /* Verify the memory is somewhat sane */ \
427 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
428 if (offset < (Elf ## B ## _Off)elf->len) { \
429 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
430 *r = (char*)(elf->data + offset); \
431 /* If quiet, don't output paths in ld.so.conf */ \
432 if (be_quiet) { \
433 size_t len; \
434 char *start, *end; \
435 /* note that we only 'chop' off leading known paths. */ \
436 /* since *r is read-only memory, we can only move the ptr forward. */ \
437 start = *r; \
438 /* scan each path in : delimited list */ \
439 while (start) { \
440 rpath_security_checks(elf, start); \
441 end = strchr(start, ':'); \
442 len = (end ? abs(end - start) : strlen(start)); \
443 for (s = 0; ldpaths[s]; ++s) { \
444 if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
445 *r = (end ? end + 1 : NULL); \
446 break; \
447 } \
448 } \
449 if (!*r || !ldpaths[s] || !end) \
450 start = NULL; \
451 else \
452 start = start + len + 1; \
453 } \
454 } \
455 if (*r) *found_rpath = 1; \
456 } \
457 ++dyn; \
458 } \
459 } }
460 SHOW_RPATH(32)
461 SHOW_RPATH(64)
462 }
463
464 if (be_wewy_wewy_quiet) return;
465
466 if (rpath && runpath) {
467 if (!strcmp(rpath, runpath)) {
468 xstrcat(ret, runpath, ret_len);
469 } else {
470 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
471 xchrcat(ret, '{', ret_len);
472 xstrcat(ret, rpath, ret_len);
473 xchrcat(ret, ',', ret_len);
474 xstrcat(ret, runpath, ret_len);
475 xchrcat(ret, '}', ret_len);
476 }
477 } else if (rpath || runpath)
478 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
479 else if (!be_quiet)
480 xstrcat(ret, " - ", ret_len);
481 }
482 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
483 {
484 unsigned long i;
485 char *needed;
486 void *strtbl_void;
487
488 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
489
490 strtbl_void = elf_findsecbyname(elf, ".dynstr");
491
492 if (elf->phdr && strtbl_void) {
493 #define SHOW_NEEDED(B) \
494 if (elf->elf_class == ELFCLASS ## B) { \
495 Elf ## B ## _Dyn *dyn; \
496 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
497 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
498 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
499 Elf ## B ## _Off offset; \
500 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
501 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
502 offset = EGET(phdr[i].p_offset); \
503 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
504 dyn = DYN ## B (elf->data + offset); \
505 while (EGET(dyn->d_tag) != DT_NULL) { \
506 if (EGET(dyn->d_tag) == DT_NEEDED) { \
507 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
508 if (offset >= (Elf ## B ## _Off)elf->len) { \
509 ++dyn; \
510 continue; \
511 } \
512 needed = (char*)(elf->data + offset); \
513 if (op == 0) { \
514 if (!be_wewy_wewy_quiet) { \
515 if (*found_needed) xchrcat(ret, ',', ret_len); \
516 xstrcat(ret, needed, ret_len); \
517 } \
518 *found_needed = 1; \
519 } else { \
520 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
521 *found_lib = 1; \
522 return (be_wewy_wewy_quiet ? NULL : needed); \
523 } \
524 } \
525 } \
526 ++dyn; \
527 } \
528 } }
529 SHOW_NEEDED(32)
530 SHOW_NEEDED(64)
531 if (op == 0 && !*found_needed && be_verbose)
532 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
533 }
534
535 return NULL;
536 }
537 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
538 {
539 void *strtbl_void;
540
541 if (!show_interp) return NULL;
542
543 strtbl_void = elf_findsecbyname(elf, ".interp");
544
545 if (strtbl_void) {
546 #define SHOW_INTERP(B) \
547 if (elf->elf_class == ELFCLASS ## B) { \
548 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
549 *found_interp = 1; \
550 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
551 }
552 SHOW_INTERP(32)
553 SHOW_INTERP(64)
554 }
555 return NULL;
556 }
557 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
558 {
559 unsigned long i;
560 struct stat s;
561
562 if (!show_bind) return NULL;
563 if (!elf->phdr) return NULL;
564
565 #define SHOW_BIND(B) \
566 if (elf->elf_class == ELFCLASS ## B) { \
567 Elf ## B ## _Dyn *dyn; \
568 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
569 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
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_BIND_NOW || \
578 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
579 { \
580 if (be_quiet) return NULL; \
581 *found_bind = 1; \
582 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
583 } \
584 ++dyn; \
585 } \
586 } \
587 }
588 SHOW_BIND(32)
589 SHOW_BIND(64)
590
591 if (be_wewy_wewy_quiet) return NULL;
592
593 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
594 return NULL;
595 } else {
596 *found_bind = 1;
597 return (char *) "LAZY";
598 }
599 }
600 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
601 {
602 unsigned long i;
603 char *soname;
604 void *strtbl_void;
605
606 if (!show_soname) return NULL;
607
608 strtbl_void = elf_findsecbyname(elf, ".dynstr");
609
610 if (elf->phdr && strtbl_void) {
611 #define SHOW_SONAME(B) \
612 if (elf->elf_class == ELFCLASS ## B) { \
613 Elf ## B ## _Dyn *dyn; \
614 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
615 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
616 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
617 Elf ## B ## _Off offset; \
618 /* only look for soname in shared objects */ \
619 if (ehdr->e_type != ET_DYN) \
620 return NULL; \
621 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
622 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
623 offset = EGET(phdr[i].p_offset); \
624 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
625 dyn = DYN ## B (elf->data + offset); \
626 while (EGET(dyn->d_tag) != DT_NULL) { \
627 if (EGET(dyn->d_tag) == DT_SONAME) { \
628 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
629 if (offset >= (Elf ## B ## _Off)elf->len) { \
630 ++dyn; \
631 continue; \
632 } \
633 soname = (char*)(elf->data + offset); \
634 *found_soname = 1; \
635 return (be_wewy_wewy_quiet ? NULL : soname); \
636 } \
637 ++dyn; \
638 } \
639 } }
640 SHOW_SONAME(32)
641 SHOW_SONAME(64)
642 }
643
644 return NULL;
645 }
646 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
647 {
648 unsigned long i;
649 char *ret;
650 void *symtab_void, *strtab_void;
651
652 if (!find_sym) return NULL;
653 ret = find_sym;
654
655 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
656
657 if (symtab_void && strtab_void) {
658 #define FIND_SYM(B) \
659 if (elf->elf_class == ELFCLASS ## B) { \
660 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
661 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
662 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
663 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
664 char *symname; \
665 for (i = 0; i < cnt; ++i) { \
666 if (sym->st_name) { \
667 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
668 if (*find_sym == '*') { \
669 printf("%s(%s) %5lX %15s %s\n", \
670 ((*found_sym == 0) ? "\n\t" : "\t"), \
671 elf->base_filename, \
672 (unsigned long)sym->st_size, \
673 get_elfstttype(sym->st_info), \
674 symname); \
675 *found_sym = 1; \
676 } else { \
677 char *this_sym, *next_sym; \
678 this_sym = find_sym; \
679 do { \
680 next_sym = strchr(this_sym, ','); \
681 if (next_sym == NULL) \
682 next_sym = this_sym + strlen(this_sym); \
683 if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
684 (strcmp(symname, versioned_symname) == 0)) { \
685 ret = this_sym; \
686 (*found_sym)++; \
687 goto break_out; \
688 } \
689 this_sym = next_sym + 1; \
690 } while (*next_sym != '\0'); \
691 } \
692 } \
693 ++sym; \
694 } }
695 FIND_SYM(32)
696 FIND_SYM(64)
697 }
698
699 break_out:
700 if (be_wewy_wewy_quiet) return NULL;
701
702 if (*find_sym != '*' && *found_sym)
703 return ret;
704 if (be_quiet)
705 return NULL;
706 else
707 return (char *)" - ";
708 }
709 /* scan an elf file and show all the fun stuff */
710 #define prints(str) write(fileno(stdout), str, strlen(str))
711 static void scanelf_file(const char *filename)
712 {
713 unsigned long i;
714 char found_pax, found_phdr, found_relro, found_load, found_textrel,
715 found_rpath, found_needed, found_interp, found_bind, found_soname,
716 found_sym, found_lib, found_file, found_textrels;
717 elfobj *elf;
718 struct stat st;
719 static char *out_buffer = NULL;
720 static size_t out_len;
721
722 /* make sure 'filename' exists */
723 if (lstat(filename, &st) == -1) {
724 if (be_verbose > 2) printf("%s: does not exist\n", filename);
725 return;
726 }
727 /* always handle regular files and handle symlinked files if no -y */
728 if (S_ISLNK(st.st_mode)) {
729 if (!scan_symlink) return;
730 stat(filename, &st);
731 }
732 if (!S_ISREG(st.st_mode)) {
733 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
734 return;
735 }
736
737 found_pax = found_phdr = found_relro = found_load = found_textrel = \
738 found_rpath = found_needed = found_interp = found_bind = found_soname = \
739 found_sym = found_lib = found_file = found_textrels = 0;
740
741 /* verify this is real ELF */
742 if ((elf = readelf(filename)) == NULL) {
743 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
744 return;
745 }
746
747 if (be_verbose > 1)
748 printf("%s: scanning file {%s,%s}\n", filename,
749 get_elfeitype(EI_CLASS, elf->elf_class),
750 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
751 else if (be_verbose)
752 printf("%s: scanning file\n", filename);
753
754 /* init output buffer */
755 if (!out_buffer) {
756 out_len = sizeof(char) * 80;
757 out_buffer = (char*)xmalloc(out_len);
758 }
759 *out_buffer = '\0';
760
761 /* show the header */
762 if (!be_quiet && show_banner) {
763 for (i = 0; out_format[i]; ++i) {
764 if (!IS_MODIFIER(out_format[i])) continue;
765
766 switch (out_format[++i]) {
767 case '%': break;
768 case '#': break;
769 case 'F':
770 case 'p':
771 case 'f': prints("FILE "); found_file = 1; break;
772 case 'o': prints(" TYPE "); break;
773 case 'x': prints(" PAX "); break;
774 case 'e': prints("STK/REL/PTL "); break;
775 case 't': prints("TEXTREL "); break;
776 case 'r': prints("RPATH "); break;
777 case 'n': prints("NEEDED "); break;
778 case 'i': prints("INTERP "); break;
779 case 'b': prints("BIND "); break;
780 case 'S': prints("SONAME "); break;
781 case 's': prints("SYM "); break;
782 case 'N': prints("LIB "); break;
783 case 'T': prints("TEXTRELS "); break;
784 default: warnf("'%c' has no title ?", out_format[i]);
785 }
786 }
787 if (!found_file) prints("FILE ");
788 prints("\n");
789 found_file = 0;
790 show_banner = 0;
791 }
792
793 /* dump all the good stuff */
794 for (i = 0; out_format[i]; ++i) {
795 const char *out;
796 const char *tmp;
797
798 /* make sure we trim leading spaces in quiet mode */
799 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
800 *out_buffer = '\0';
801
802 if (!IS_MODIFIER(out_format[i])) {
803 xchrcat(&out_buffer, out_format[i], &out_len);
804 continue;
805 }
806
807 out = NULL;
808 be_wewy_wewy_quiet = (out_format[i] == '#');
809 switch (out_format[++i]) {
810 case '%':
811 case '#':
812 xchrcat(&out_buffer, out_format[i], &out_len); break;
813 case 'F':
814 found_file = 1;
815 if (be_wewy_wewy_quiet) break;
816 xstrcat(&out_buffer, filename, &out_len);
817 break;
818 case 'p':
819 found_file = 1;
820 if (be_wewy_wewy_quiet) break;
821 tmp = filename;
822 if (search_path) {
823 ssize_t len_search = strlen(search_path);
824 ssize_t len_file = strlen(filename);
825 if (!strncmp(filename, search_path, len_search) && \
826 len_file > len_search)
827 tmp += len_search;
828 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
829 }
830 xstrcat(&out_buffer, tmp, &out_len);
831 break;
832 case 'f':
833 found_file = 1;
834 if (be_wewy_wewy_quiet) break;
835 tmp = strrchr(filename, '/');
836 tmp = (tmp == NULL ? filename : tmp+1);
837 xstrcat(&out_buffer, tmp, &out_len);
838 break;
839 case 'o': out = get_elfetype(elf); break;
840 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
841 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
842 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
843 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
844 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
845 case 'n':
846 case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
847 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
848 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
849 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
850 case 's': out = scanelf_file_sym(elf, &found_sym); break;
851 default: warnf("'%c' has no scan code?", out_format[i]);
852 }
853 if (out) {
854 /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
855 if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
856 xstrncat(&out_buffer, out, &out_len, (tmp-out));
857 else
858 xstrcat(&out_buffer, out, &out_len);
859 }
860 }
861
862 #define FOUND_SOMETHING() \
863 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
864 found_rpath || found_needed || found_interp || found_bind || \
865 found_soname || found_sym || found_lib || found_textrels)
866
867 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
868 xchrcat(&out_buffer, ' ', &out_len);
869 xstrcat(&out_buffer, filename, &out_len);
870 }
871 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
872 puts(out_buffer);
873 fflush(stdout);
874 }
875
876 unreadelf(elf);
877 }
878
879 /* scan a directory for ET_EXEC files and print when we find one */
880 static void scanelf_dir(const char *path)
881 {
882 register DIR *dir;
883 register struct dirent *dentry;
884 struct stat st_top, st;
885 char buf[_POSIX_PATH_MAX];
886 size_t pathlen = 0, len = 0;
887
888 /* make sure path exists */
889 if (lstat(path, &st_top) == -1) {
890 if (be_verbose > 2) printf("%s: does not exist\n", path);
891 return;
892 }
893
894 /* ok, if it isn't a directory, assume we can open it */
895 if (!S_ISDIR(st_top.st_mode)) {
896 scanelf_file(path);
897 return;
898 }
899
900 /* now scan the dir looking for fun stuff */
901 if ((dir = opendir(path)) == NULL) {
902 warnf("could not opendir %s: %s", path, strerror(errno));
903 return;
904 }
905 if (be_verbose) printf("%s: scanning dir\n", path);
906
907 pathlen = strlen(path);
908 while ((dentry = readdir(dir))) {
909 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
910 continue;
911 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
912 if (len >= sizeof(buf)) {
913 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
914 (unsigned long)len, (unsigned long)sizeof(buf));
915 continue;
916 }
917 sprintf(buf, "%s/%s", path, dentry->d_name);
918 if (lstat(buf, &st) != -1) {
919 if (S_ISREG(st.st_mode))
920 scanelf_file(buf);
921 else if (dir_recurse && S_ISDIR(st.st_mode)) {
922 if (dir_crossmount || (st_top.st_dev == st.st_dev))
923 scanelf_dir(buf);
924 }
925 }
926 }
927 closedir(dir);
928 }
929
930 static int scanelf_from_file(char *filename)
931 {
932 FILE *fp = NULL;
933 char *p;
934 char path[_POSIX_PATH_MAX];
935
936 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
937 fp = stdin;
938 else if ((fp = fopen(filename, "r")) == NULL)
939 return 1;
940
941 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
942 if ((p = strchr(path, '\n')) != NULL)
943 *p = 0;
944 search_path = path;
945 scanelf_dir(path);
946 }
947 if (fp != stdin)
948 fclose(fp);
949 return 0;
950 }
951
952 static void load_ld_so_conf()
953 {
954 FILE *fp = NULL;
955 char *p;
956 char path[_POSIX_PATH_MAX];
957 int i = 0;
958
959 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
960 return;
961
962 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
963 if (*path != '/')
964 continue;
965
966 if ((p = strrchr(path, '\r')) != NULL)
967 *p = 0;
968 if ((p = strchr(path, '\n')) != NULL)
969 *p = 0;
970
971 ldpaths[i++] = xstrdup(path);
972
973 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
974 break;
975 }
976 ldpaths[i] = NULL;
977
978 fclose(fp);
979 }
980
981 /* scan /etc/ld.so.conf for paths */
982 static void scanelf_ldpath()
983 {
984 char scan_l, scan_ul, scan_ull;
985 int i = 0;
986
987 if (!ldpaths[0])
988 err("Unable to load any paths from ld.so.conf");
989
990 scan_l = scan_ul = scan_ull = 0;
991
992 while (ldpaths[i]) {
993 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
994 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
995 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
996 scanelf_dir(ldpaths[i]);
997 ++i;
998 }
999
1000 if (!scan_l) scanelf_dir("/lib");
1001 if (!scan_ul) scanelf_dir("/usr/lib");
1002 if (!scan_ull) scanelf_dir("/usr/local/lib");
1003 }
1004
1005 /* scan env PATH for paths */
1006 static void scanelf_envpath()
1007 {
1008 char *path, *p;
1009
1010 path = getenv("PATH");
1011 if (!path)
1012 err("PATH is not set in your env !");
1013 path = xstrdup(path);
1014
1015 while ((p = strrchr(path, ':')) != NULL) {
1016 scanelf_dir(p + 1);
1017 *p = 0;
1018 }
1019
1020 free(path);
1021 }
1022
1023
1024
1025 /* usage / invocation handling functions */
1026 #define PARSE_FLAGS "plRmyxetrnibSs:gN:TaqvF:f:o:BhV"
1027 #define a_argument required_argument
1028 static struct option const long_opts[] = {
1029 {"path", no_argument, NULL, 'p'},
1030 {"ldpath", no_argument, NULL, 'l'},
1031 {"recursive", no_argument, NULL, 'R'},
1032 {"mount", no_argument, NULL, 'm'},
1033 {"symlink", no_argument, NULL, 'y'},
1034 {"pax", no_argument, NULL, 'x'},
1035 {"header", no_argument, NULL, 'e'},
1036 {"textrel", no_argument, NULL, 't'},
1037 {"rpath", no_argument, NULL, 'r'},
1038 {"needed", no_argument, NULL, 'n'},
1039 {"interp", no_argument, NULL, 'i'},
1040 {"bind", no_argument, NULL, 'b'},
1041 {"soname", no_argument, NULL, 'S'},
1042 {"symbol", a_argument, NULL, 's'},
1043 {"lib", a_argument, NULL, 'N'},
1044 {"gmatch", no_argument, NULL, 'g'},
1045 {"textrels", no_argument, NULL, 'T'},
1046 {"all", no_argument, NULL, 'a'},
1047 {"quiet", no_argument, NULL, 'q'},
1048 {"verbose", no_argument, NULL, 'v'},
1049 {"format", a_argument, NULL, 'F'},
1050 {"from", a_argument, NULL, 'f'},
1051 {"file", a_argument, NULL, 'o'},
1052 {"nobanner", no_argument, NULL, 'B'},
1053 {"help", no_argument, NULL, 'h'},
1054 {"version", no_argument, NULL, 'V'},
1055 {NULL, no_argument, NULL, 0x0}
1056 };
1057
1058 static const char *opts_help[] = {
1059 "Scan all directories in PATH environment",
1060 "Scan all directories in /etc/ld.so.conf",
1061 "Scan directories recursively",
1062 "Don't recursively cross mount points",
1063 "Don't scan symlinks\n",
1064 "Print PaX markings",
1065 "Print GNU_STACK/PT_LOAD markings",
1066 "Print TEXTREL information",
1067 "Print RPATH information",
1068 "Print NEEDED information",
1069 "Print INTERP information",
1070 "Print BIND information",
1071 "Print SONAME information",
1072 "Find a specified symbol",
1073 "Find a specified library",
1074 "Use strncmp to match libraries. (use with -N)",
1075 "Locate cause of TEXTREL",
1076 "Print all scanned info (-x -e -t -r -b)\n",
1077 "Only output 'bad' things",
1078 "Be verbose (can be specified more than once)",
1079 "Use specified format for output",
1080 "Read input stream from a filename",
1081 "Write output stream to a filename",
1082 "Don't display the header",
1083 "Print this help and exit",
1084 "Print version and exit",
1085 NULL
1086 };
1087
1088 /* display usage and exit */
1089 static void usage(int status)
1090 {
1091 unsigned long i;
1092 printf("* Scan ELF binaries for stuff\n\n"
1093 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
1094 printf("Options: -[%s]\n", PARSE_FLAGS);
1095 for (i = 0; long_opts[i].name; ++i)
1096 if (long_opts[i].has_arg == no_argument)
1097 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1098 long_opts[i].name, opts_help[i]);
1099 else
1100 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1101 long_opts[i].name, opts_help[i]);
1102
1103 if (status != EXIT_SUCCESS)
1104 exit(status);
1105
1106 puts("\nThe format modifiers for the -F option are:");
1107 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1108 puts(" t TEXTREL \tr RPATH \tn NEEDED");
1109 puts(" i INTERP \tb BIND \ts symbol");
1110 puts(" N library \to Type \tT TEXTRELs");
1111 puts(" S SONAME");
1112 puts(" p filename (with search path removed)");
1113 puts(" f filename (short name/basename)");
1114 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1115
1116 exit(status);
1117 }
1118
1119 /* parse command line arguments and preform needed actions */
1120 static void parseargs(int argc, char *argv[])
1121 {
1122 int i;
1123 char *from_file = NULL;
1124
1125 opterr = 0;
1126 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1127 switch (i) {
1128
1129 case 'V':
1130 printf("pax-utils-%s: %s compiled %s\n%s\n"
1131 "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1132 VERSION, __FILE__, __DATE__, rcsid, argv0);
1133 exit(EXIT_SUCCESS);
1134 break;
1135 case 'h': usage(EXIT_SUCCESS); break;
1136 case 'f':
1137 if (from_file) err("Don't specify -f twice");
1138 from_file = xstrdup(optarg);
1139 break;
1140 case 'o': {
1141 FILE *fp = NULL;
1142 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1143 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1144 SET_STDOUT(fp);
1145 break;
1146 }
1147
1148 case 's': {
1149 if (find_sym) warn("You prob don't want to specify -s twice");
1150 find_sym = optarg;
1151 versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1152 sprintf(versioned_symname, "%s@", find_sym);
1153 break;
1154 }
1155 case 'N': {
1156 if (find_lib) warn("You prob don't want to specify -N twice");
1157 find_lib = optarg;
1158 break;
1159 }
1160
1161 case 'F': {
1162 if (out_format) warn("You prob don't want to specify -F twice");
1163 out_format = optarg;
1164 break;
1165 }
1166
1167 case 'g': gmatch = 1;
1168 case 'y': scan_symlink = 0; break;
1169 case 'B': show_banner = 0; break;
1170 case 'l': scan_ldpath = 1; break;
1171 case 'p': scan_envpath = 1; break;
1172 case 'R': dir_recurse = 1; break;
1173 case 'm': dir_crossmount = 0; break;
1174 case 'x': show_pax = 1; break;
1175 case 'e': show_phdr = 1; break;
1176 case 't': show_textrel = 1; break;
1177 case 'r': show_rpath = 1; break;
1178 case 'n': show_needed = 1; break;
1179 case 'i': show_interp = 1; break;
1180 case 'b': show_bind = 1; break;
1181 case 'S': show_soname = 1; break;
1182 case 'T': show_textrels = 1; break;
1183 case 'q': be_quiet = 1; break;
1184 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1185 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1186
1187 case ':':
1188 err("Option missing parameter\n");
1189 case '?':
1190 err("Unknown option\n");
1191 default:
1192 err("Unhandled option '%c'", i);
1193 }
1194 }
1195
1196 /* let the format option override all other options */
1197 if (out_format) {
1198 show_pax = show_phdr = show_textrel = show_rpath = \
1199 show_needed = show_interp = show_bind = show_soname = \
1200 show_textrels = 0;
1201 for (i = 0; out_format[i]; ++i) {
1202 if (!IS_MODIFIER(out_format[i])) continue;
1203
1204 switch (out_format[++i]) {
1205 case '%': break;
1206 case '#': break;
1207 case 'F': break;
1208 case 'p': break;
1209 case 'f': break;
1210 case 's': break;
1211 case 'N': break;
1212 case 'o': break;
1213 case 'x': show_pax = 1; break;
1214 case 'e': show_phdr = 1; break;
1215 case 't': show_textrel = 1; break;
1216 case 'r': show_rpath = 1; break;
1217 case 'n': show_needed = 1; break;
1218 case 'i': show_interp = 1; break;
1219 case 'b': show_bind = 1; break;
1220 case 'S': show_soname = 1; break;
1221 case 'T': show_textrels = 1; break;
1222 default:
1223 err("Invalid format specifier '%c' (byte %i)",
1224 out_format[i], i+1);
1225 }
1226 }
1227
1228 /* construct our default format */
1229 } else {
1230 size_t fmt_len = 30;
1231 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1232 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1233 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1234 if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1235 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1236 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1237 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1238 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1239 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1240 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1241 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1242 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1243 if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1244 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1245 }
1246 if (be_verbose > 2) printf("Format: %s\n", out_format);
1247
1248 /* now lets actually do the scanning */
1249 if (scan_ldpath || (show_rpath && be_quiet))
1250 load_ld_so_conf();
1251 if (scan_ldpath) scanelf_ldpath();
1252 if (scan_envpath) scanelf_envpath();
1253 if (from_file) {
1254 scanelf_from_file(from_file);
1255 free(from_file);
1256 from_file = *argv;
1257 }
1258 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1259 err("Nothing to scan !?");
1260 while (optind < argc) {
1261 search_path = argv[optind++];
1262 scanelf_dir(search_path);
1263 }
1264
1265 /* clean up */
1266 if (versioned_symname) free(versioned_symname);
1267 for (i = 0; ldpaths[i]; ++i)
1268 free(ldpaths[i]);
1269 }
1270
1271
1272
1273 /* utility funcs */
1274 static char *xstrdup(const char *s)
1275 {
1276 char *ret = strdup(s);
1277 if (!ret) err("Could not strdup(): %s", strerror(errno));
1278 return ret;
1279 }
1280 static void *xmalloc(size_t size)
1281 {
1282 void *ret = malloc(size);
1283 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1284 return ret;
1285 }
1286 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1287 {
1288 size_t new_len;
1289
1290 new_len = strlen(*dst) + strlen(src);
1291 if (*curr_len <= new_len) {
1292 *curr_len = new_len + (*curr_len / 2);
1293 *dst = realloc(*dst, *curr_len);
1294 if (!*dst)
1295 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1296 }
1297
1298 if (n)
1299 strncat(*dst, src, n);
1300 else
1301 strcat(*dst, src);
1302 }
1303 static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1304 {
1305 static char my_app[2];
1306 my_app[0] = append;
1307 my_app[1] = '\0';
1308 xstrcat(dst, my_app, curr_len);
1309 }
1310
1311
1312
1313 int main(int argc, char *argv[])
1314 {
1315 if (argc < 2)
1316 usage(EXIT_FAILURE);
1317 parseargs(argc, argv);
1318 fclose(stdout);
1319 #ifdef __BOUNDS_CHECKING_ON
1320 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1321 #endif
1322 return EXIT_SUCCESS;
1323 }

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