| 1 |
/* |
| 2 |
* Copyright 2003 Ned Ludd <solar@gentoo.org> |
| 3 |
* Copyright 1999-2005 Gentoo Foundation |
| 4 |
* Distributed under the terms of the GNU General Public License v2 |
| 5 |
* $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.52 2005/05/18 14:37:21 solar Exp $ |
| 6 |
* |
| 7 |
******************************************************************** |
| 8 |
* This program is free software; you can redistribute it and/or |
| 9 |
* modify it under the terms of the GNU General Public License as |
| 10 |
* published by the Free Software Foundation; either version 2 of the |
| 11 |
* License, or (at your option) any later version. |
| 12 |
* |
| 13 |
* This program is distributed in the hope that it will be useful, but |
| 14 |
* WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 |
* General Public License for more details. |
| 17 |
* |
| 18 |
* You should have received a copy of the GNU General Public License |
| 19 |
* along with this program; if not, write to the Free Software |
| 20 |
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 21 |
* MA 02111-1307, USA. |
| 22 |
*/ |
| 23 |
|
| 24 |
#include <stdio.h> |
| 25 |
#include <stdlib.h> |
| 26 |
#include <sys/types.h> |
| 27 |
#define __USE_GNU |
| 28 |
#include <string.h> |
| 29 |
#include <errno.h> |
| 30 |
#include <unistd.h> |
| 31 |
#include <sys/stat.h> |
| 32 |
#include <dirent.h> |
| 33 |
#include <getopt.h> |
| 34 |
#include <assert.h> |
| 35 |
|
| 36 |
#include "paxelf.h" |
| 37 |
|
| 38 |
static const char *rcsid = "$Id: scanelf.c,v 1.52 2005/05/18 14:37:21 solar Exp $"; |
| 39 |
#define argv0 "scanelf" |
| 40 |
|
| 41 |
|
| 42 |
|
| 43 |
/* prototypes */ |
| 44 |
static void scanelf_file(const char *filename); |
| 45 |
static void scanelf_dir(const char *path); |
| 46 |
static void scanelf_ldpath(); |
| 47 |
static void scanelf_envpath(); |
| 48 |
static void usage(int status); |
| 49 |
static void parseargs(int argc, char *argv[]); |
| 50 |
static char *xstrdup(char *s); |
| 51 |
static void *xmalloc(size_t size); |
| 52 |
static void xstrcat(char **dst, const char *src, size_t *curr_len); |
| 53 |
static inline void xchrcat(char **dst, const char append, size_t *curr_len); |
| 54 |
static int xemptybuffer(const char *buff); |
| 55 |
|
| 56 |
/* variables to control behavior */ |
| 57 |
static char *ldpaths[256]; |
| 58 |
static char scan_ldpath = 0; |
| 59 |
static char scan_envpath = 0; |
| 60 |
static char scan_symlink = 1; |
| 61 |
static char dir_recurse = 0; |
| 62 |
static char dir_crossmount = 1; |
| 63 |
static char show_pax = 0; |
| 64 |
static char show_stack = 0; |
| 65 |
static char show_textrel = 0; |
| 66 |
static char show_rpath = 0; |
| 67 |
static char show_needed = 0; |
| 68 |
static char show_interp = 0; |
| 69 |
static char show_bind = 0; |
| 70 |
static char show_banner = 1; |
| 71 |
static char be_quiet = 0; |
| 72 |
static char be_verbose = 0; |
| 73 |
static char *find_sym = NULL, *versioned_symname = NULL; |
| 74 |
static char *out_format = NULL; |
| 75 |
|
| 76 |
|
| 77 |
|
| 78 |
/* sub-funcs for scanelf_file() */ |
| 79 |
static char *scanelf_file_pax(elfobj *elf, char *found_pax) |
| 80 |
{ |
| 81 |
static char *paxflags; |
| 82 |
|
| 83 |
if (!show_pax) return NULL; |
| 84 |
|
| 85 |
paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); |
| 86 |
if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { |
| 87 |
*found_pax = 1; |
| 88 |
return paxflags; |
| 89 |
} |
| 90 |
|
| 91 |
return NULL; |
| 92 |
} |
| 93 |
static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro) |
| 94 |
{ |
| 95 |
static char ret[8]; |
| 96 |
char *found; |
| 97 |
unsigned long i, off, shown; |
| 98 |
|
| 99 |
if (!show_stack) return NULL; |
| 100 |
|
| 101 |
shown = 0; |
| 102 |
strcpy(ret, "--- ---"); |
| 103 |
|
| 104 |
if (elf->phdr) { |
| 105 |
#define SHOW_STACK(B) \ |
| 106 |
if (elf->elf_class == ELFCLASS ## B) { \ |
| 107 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
| 108 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
| 109 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
| 110 |
if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ |
| 111 |
found = found_stack; \ |
| 112 |
off = 0; \ |
| 113 |
} else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ |
| 114 |
found = found_relro; \ |
| 115 |
off = 4; \ |
| 116 |
} else \ |
| 117 |
continue; \ |
| 118 |
if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ |
| 119 |
continue; \ |
| 120 |
memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ |
| 121 |
*found = 1; \ |
| 122 |
++shown; \ |
| 123 |
} \ |
| 124 |
} |
| 125 |
SHOW_STACK(32) |
| 126 |
SHOW_STACK(64) |
| 127 |
} |
| 128 |
|
| 129 |
if (be_quiet && !shown) |
| 130 |
return NULL; |
| 131 |
else |
| 132 |
return ret; |
| 133 |
} |
| 134 |
static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) |
| 135 |
{ |
| 136 |
static char *ret = "TEXTREL"; |
| 137 |
unsigned long i; |
| 138 |
|
| 139 |
if (!show_textrel) return NULL; |
| 140 |
|
| 141 |
if (elf->phdr) { |
| 142 |
#define SHOW_TEXTREL(B) \ |
| 143 |
if (elf->elf_class == ELFCLASS ## B) { \ |
| 144 |
Elf ## B ## _Dyn *dyn; \ |
| 145 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
| 146 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
| 147 |
Elf ## B ## _Off offset; \ |
| 148 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
| 149 |
if (phdr[i].p_type != PT_DYNAMIC) continue; \ |
| 150 |
offset = EGET(phdr[i].p_offset); \ |
| 151 |
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
| 152 |
dyn = DYN ## B (elf->data + offset); \ |
| 153 |
while (EGET(dyn->d_tag) != DT_NULL) { \ |
| 154 |
if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ |
| 155 |
*found_textrel = 1; \ |
| 156 |
/*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ |
| 157 |
return ret; \ |
| 158 |
} \ |
| 159 |
++dyn; \ |
| 160 |
} \ |
| 161 |
} } |
| 162 |
SHOW_TEXTREL(32) |
| 163 |
SHOW_TEXTREL(64) |
| 164 |
} |
| 165 |
|
| 166 |
if (be_quiet) |
| 167 |
return NULL; |
| 168 |
else |
| 169 |
return " - "; |
| 170 |
} |
| 171 |
static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) |
| 172 |
{ |
| 173 |
/* TODO: when checking RPATH entries, check each subpath (between :) in ld.so.conf */ |
| 174 |
unsigned long i, s; |
| 175 |
char *rpath, *runpath, **r; |
| 176 |
void *strtbl_void; |
| 177 |
|
| 178 |
if (!show_rpath) return; |
| 179 |
|
| 180 |
strtbl_void = elf_findsecbyname(elf, ".dynstr"); |
| 181 |
rpath = runpath = NULL; |
| 182 |
|
| 183 |
if (elf->phdr && strtbl_void) { |
| 184 |
#define SHOW_RPATH(B) \ |
| 185 |
if (elf->elf_class == ELFCLASS ## B) { \ |
| 186 |
Elf ## B ## _Dyn *dyn; \ |
| 187 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
| 188 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
| 189 |
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ |
| 190 |
Elf ## B ## _Off offset; \ |
| 191 |
Elf ## B ## _Sxword word; \ |
| 192 |
/* Scan all the program headers */ \ |
| 193 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
| 194 |
/* Just scan dynamic headers */ \ |
| 195 |
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ |
| 196 |
offset = EGET(phdr[i].p_offset); \ |
| 197 |
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
| 198 |
/* Just scan dynamic RPATH/RUNPATH headers */ \ |
| 199 |
dyn = DYN ## B (elf->data + offset); \ |
| 200 |
while ((word=EGET(dyn->d_tag)) != DT_NULL) { \ |
| 201 |
if (word == DT_RPATH) { \ |
| 202 |
r = &rpath; \ |
| 203 |
} else if (word == DT_RUNPATH) { \ |
| 204 |
r = &runpath; \ |
| 205 |
} else { \ |
| 206 |
++dyn; \ |
| 207 |
continue; \ |
| 208 |
} \ |
| 209 |
/* Verify the memory is somewhat sane */ \ |
| 210 |
offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ |
| 211 |
if (offset < elf->len) { \ |
| 212 |
if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \ |
| 213 |
*r = (char*)(elf->data + offset); \ |
| 214 |
/* If quiet, don't output paths in ld.so.conf */ \ |
| 215 |
if (be_quiet) \ |
| 216 |
for (s = 0; ldpaths[s]; ++s) \ |
| 217 |
if (!strcmp(ldpaths[s], *r)) { \ |
| 218 |
*r = NULL; \ |
| 219 |
break; \ |
| 220 |
} \ |
| 221 |
if (*r) *found_rpath = 1; \ |
| 222 |
} \ |
| 223 |
++dyn; \ |
| 224 |
} \ |
| 225 |
} } |
| 226 |
SHOW_RPATH(32) |
| 227 |
SHOW_RPATH(64) |
| 228 |
} |
| 229 |
|
| 230 |
if (rpath && runpath) { |
| 231 |
if (!strcmp(rpath, runpath)) { |
| 232 |
xstrcat(ret, runpath, ret_len); |
| 233 |
} else { |
| 234 |
fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath); |
| 235 |
xchrcat(ret, '{', ret_len); |
| 236 |
xstrcat(ret, rpath, ret_len); |
| 237 |
xchrcat(ret, ',', ret_len); |
| 238 |
xstrcat(ret, runpath, ret_len); |
| 239 |
xchrcat(ret, '}', ret_len); |
| 240 |
} |
| 241 |
} else if (rpath || runpath) |
| 242 |
xstrcat(ret, (runpath ? runpath : rpath), ret_len); |
| 243 |
else if (!be_quiet) |
| 244 |
xstrcat(ret, " - ", ret_len); |
| 245 |
} |
| 246 |
static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len) |
| 247 |
{ |
| 248 |
unsigned long i; |
| 249 |
char *needed; |
| 250 |
void *strtbl_void; |
| 251 |
|
| 252 |
if (!show_needed) return; |
| 253 |
|
| 254 |
strtbl_void = elf_findsecbyname(elf, ".dynstr"); |
| 255 |
|
| 256 |
if (elf->phdr && strtbl_void) { |
| 257 |
#define SHOW_NEEDED(B) \ |
| 258 |
if (elf->elf_class == ELFCLASS ## B) { \ |
| 259 |
Elf ## B ## _Dyn *dyn; \ |
| 260 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
| 261 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
| 262 |
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ |
| 263 |
Elf ## B ## _Off offset; \ |
| 264 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
| 265 |
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ |
| 266 |
offset = EGET(phdr[i].p_offset); \ |
| 267 |
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
| 268 |
dyn = DYN ## B (elf->data + offset); \ |
| 269 |
while (EGET(dyn->d_tag) != DT_NULL) { \ |
| 270 |
if (EGET(dyn->d_tag) == DT_NEEDED) { \ |
| 271 |
offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ |
| 272 |
if (offset >= elf->len) { \ |
| 273 |
++dyn; \ |
| 274 |
continue; \ |
| 275 |
} \ |
| 276 |
needed = (char*)(elf->data + offset); \ |
| 277 |
if (*found_needed) xchrcat(ret, ',', ret_len); \ |
| 278 |
xstrcat(ret, needed, ret_len); \ |
| 279 |
*found_needed = 1; \ |
| 280 |
} \ |
| 281 |
++dyn; \ |
| 282 |
} \ |
| 283 |
} } |
| 284 |
SHOW_NEEDED(32) |
| 285 |
SHOW_NEEDED(64) |
| 286 |
} |
| 287 |
} |
| 288 |
static char *scanelf_file_interp(elfobj *elf, char *found_interp) |
| 289 |
{ |
| 290 |
void *strtbl_void; |
| 291 |
|
| 292 |
if (!show_interp) return NULL; |
| 293 |
|
| 294 |
strtbl_void = elf_findsecbyname(elf, ".interp"); |
| 295 |
|
| 296 |
if (strtbl_void) { |
| 297 |
#define SHOW_INTERP(B) \ |
| 298 |
if (elf->elf_class == ELFCLASS ## B) { \ |
| 299 |
Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ |
| 300 |
*found_interp = 1; \ |
| 301 |
return elf->data + EGET(strtbl->sh_offset); \ |
| 302 |
} |
| 303 |
SHOW_INTERP(32) |
| 304 |
SHOW_INTERP(64) |
| 305 |
} |
| 306 |
return NULL; |
| 307 |
} |
| 308 |
static char *scanelf_file_bind(elfobj *elf, char *found_bind) |
| 309 |
{ |
| 310 |
unsigned long i; |
| 311 |
struct stat s; |
| 312 |
|
| 313 |
if (!show_bind) return NULL; |
| 314 |
if (!elf->phdr) return NULL; |
| 315 |
|
| 316 |
#define SHOW_BIND(B) \ |
| 317 |
if (elf->elf_class == ELFCLASS ## B) { \ |
| 318 |
Elf ## B ## _Dyn *dyn; \ |
| 319 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
| 320 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
| 321 |
Elf ## B ## _Off offset; \ |
| 322 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
| 323 |
if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ |
| 324 |
offset = EGET(phdr[i].p_offset); \ |
| 325 |
if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
| 326 |
dyn = DYN ## B (elf->data + offset); \ |
| 327 |
while (EGET(dyn->d_tag) != DT_NULL) { \ |
| 328 |
if (EGET(dyn->d_tag) == DT_BIND_NOW || \ |
| 329 |
(EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \ |
| 330 |
{ \ |
| 331 |
if (be_quiet) return NULL; \ |
| 332 |
*found_bind = 1; \ |
| 333 |
return "NOW"; \ |
| 334 |
} \ |
| 335 |
++dyn; \ |
| 336 |
} \ |
| 337 |
} \ |
| 338 |
} |
| 339 |
SHOW_BIND(32) |
| 340 |
SHOW_BIND(64) |
| 341 |
|
| 342 |
fstat(elf->fd, &s); |
| 343 |
if (be_quiet && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) { |
| 344 |
return NULL; |
| 345 |
} else { |
| 346 |
*found_bind = 1; |
| 347 |
return "LAZY"; |
| 348 |
} |
| 349 |
} |
| 350 |
static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) |
| 351 |
{ |
| 352 |
unsigned long i; |
| 353 |
void *symtab_void, *strtab_void; |
| 354 |
|
| 355 |
if (!find_sym) return NULL; |
| 356 |
|
| 357 |
symtab_void = elf_findsecbyname(elf, ".symtab"); |
| 358 |
strtab_void = elf_findsecbyname(elf, ".strtab"); |
| 359 |
|
| 360 |
if (symtab_void && strtab_void) { |
| 361 |
#define FIND_SYM(B) \ |
| 362 |
if (elf->elf_class == ELFCLASS ## B) { \ |
| 363 |
Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ |
| 364 |
Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ |
| 365 |
Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ |
| 366 |
unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ |
| 367 |
char *symname; \ |
| 368 |
for (i = 0; i < cnt; ++i) { \ |
| 369 |
if (sym->st_name) { \ |
| 370 |
symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ |
| 371 |
if (*find_sym == '*') { \ |
| 372 |
printf("%s(%s) %5lX %15s %s\n", \ |
| 373 |
((*found_sym == 0) ? "\n\t" : "\t"), \ |
| 374 |
(char *)basename(filename), \ |
| 375 |
(long)sym->st_size, \ |
| 376 |
(char *)get_elfstttype(sym->st_info), \ |
| 377 |
symname); \ |
| 378 |
*found_sym = 1; \ |
| 379 |
} else if ((strcmp(find_sym, symname) == 0) || \ |
| 380 |
(strcmp(symname, versioned_symname) == 0)) \ |
| 381 |
(*found_sym)++; \ |
| 382 |
} \ |
| 383 |
++sym; \ |
| 384 |
} } |
| 385 |
FIND_SYM(32) |
| 386 |
FIND_SYM(64) |
| 387 |
} |
| 388 |
if (*find_sym != '*' && *found_sym) |
| 389 |
return find_sym; |
| 390 |
if (be_quiet) |
| 391 |
return NULL; |
| 392 |
else |
| 393 |
return " - "; |
| 394 |
} |
| 395 |
/* scan an elf file and show all the fun stuff */ |
| 396 |
#define prints(str) fputs(str, stdout) |
| 397 |
static void scanelf_file(const char *filename) |
| 398 |
{ |
| 399 |
unsigned long i; |
| 400 |
char found_pax, found_stack, found_relro, found_textrel, |
| 401 |
found_rpath, found_needed, found_interp, found_bind, |
| 402 |
found_sym, found_file; |
| 403 |
elfobj *elf; |
| 404 |
struct stat st; |
| 405 |
static char *out_buffer = NULL; |
| 406 |
static size_t out_len; |
| 407 |
|
| 408 |
/* make sure 'filename' exists */ |
| 409 |
if (lstat(filename, &st) == -1) { |
| 410 |
if (be_verbose > 2) printf("%s: does not exist\n", filename); |
| 411 |
return; |
| 412 |
} |
| 413 |
/* always handle regular files and handle symlinked files if no -y */ |
| 414 |
if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) { |
| 415 |
if (be_verbose > 2) printf("%s: skipping non-file\n", filename); |
| 416 |
return; |
| 417 |
} |
| 418 |
|
| 419 |
found_pax = found_stack = found_relro = found_textrel = \ |
| 420 |
found_rpath = found_needed = found_interp = found_bind = \ |
| 421 |
found_sym = found_file = 0; |
| 422 |
|
| 423 |
/* verify this is real ELF */ |
| 424 |
if ((elf = readelf(filename)) == NULL) { |
| 425 |
if (be_verbose > 2) printf("%s: not an ELF\n", filename); |
| 426 |
return; |
| 427 |
} |
| 428 |
|
| 429 |
if (be_verbose > 1) |
| 430 |
printf("%s: scanning file {%s,%s}\n", filename, |
| 431 |
get_elfeitype(elf, EI_CLASS, elf->elf_class), |
| 432 |
get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); |
| 433 |
else if (be_verbose) |
| 434 |
printf("%s: scanning file\n", filename); |
| 435 |
|
| 436 |
/* init output buffer */ |
| 437 |
if (!out_buffer) { |
| 438 |
out_len = sizeof(char) * 80; |
| 439 |
out_buffer = (char*)xmalloc(out_len); |
| 440 |
} |
| 441 |
*out_buffer = '\0'; |
| 442 |
|
| 443 |
/* show the header */ |
| 444 |
if (!be_quiet && show_banner) { |
| 445 |
for (i = 0; out_format[i]; ++i) { |
| 446 |
if (out_format[i] != '%') continue; |
| 447 |
|
| 448 |
switch (out_format[++i]) { |
| 449 |
case '%': break; |
| 450 |
case 'F': prints("FILE "); found_file = 1; break; |
| 451 |
case 'o': prints(" TYPE "); break; |
| 452 |
case 'x': prints(" PAX "); break; |
| 453 |
case 'e': prints("STK/REL "); break; |
| 454 |
case 't': prints("TEXTREL "); break; |
| 455 |
case 'r': prints("RPATH "); break; |
| 456 |
case 'n': prints("NEEDED "); break; |
| 457 |
case 'i': prints("INTERP "); break; |
| 458 |
case 'b': prints("BIND "); break; |
| 459 |
case 's': prints("SYM "); break; |
| 460 |
} |
| 461 |
} |
| 462 |
if (!found_file) prints("FILE "); |
| 463 |
prints("\n"); |
| 464 |
found_file = 0; |
| 465 |
show_banner = 0; |
| 466 |
} |
| 467 |
|
| 468 |
/* dump all the good stuff */ |
| 469 |
for (i = 0; out_format[i]; ++i) { |
| 470 |
const char *out; |
| 471 |
|
| 472 |
/* make sure we trim leading spaces in quiet mode */ |
| 473 |
if (be_quiet && *out_buffer == ' ' && !out_buffer[1]) |
| 474 |
*out_buffer = '\0'; |
| 475 |
|
| 476 |
if (out_format[i] != '%') { |
| 477 |
xchrcat(&out_buffer, out_format[i], &out_len); |
| 478 |
continue; |
| 479 |
} |
| 480 |
|
| 481 |
out = NULL; |
| 482 |
switch (out_format[++i]) { |
| 483 |
case '%': xchrcat(&out_buffer, '%', &out_len); break; |
| 484 |
case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break; |
| 485 |
case 'o': out = get_elfetype(elf); break; |
| 486 |
case 'x': out = scanelf_file_pax(elf, &found_pax); break; |
| 487 |
case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break; |
| 488 |
case 't': out = scanelf_file_textrel(elf, &found_textrel); break; |
| 489 |
case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break; |
| 490 |
case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break; |
| 491 |
case 'i': out = scanelf_file_interp(elf, &found_interp); break; |
| 492 |
case 'b': out = scanelf_file_bind(elf, &found_bind); break; |
| 493 |
case 's': out = scanelf_file_sym(elf, &found_sym, filename); break; |
| 494 |
} |
| 495 |
if (out) xstrcat(&out_buffer, out, &out_len); |
| 496 |
} |
| 497 |
|
| 498 |
if (!found_file) { |
| 499 |
if (!be_quiet || found_pax || found_stack || found_textrel || \ |
| 500 |
found_rpath || found_needed || found_interp || found_bind || \ |
| 501 |
found_sym) |
| 502 |
{ |
| 503 |
xchrcat(&out_buffer, ' ', &out_len); |
| 504 |
xstrcat(&out_buffer, filename, &out_len); |
| 505 |
} |
| 506 |
} |
| 507 |
if (!(be_quiet && xemptybuffer(out_buffer))) |
| 508 |
puts(out_buffer); |
| 509 |
|
| 510 |
unreadelf(elf); |
| 511 |
} |
| 512 |
|
| 513 |
/* scan a directory for ET_EXEC files and print when we find one */ |
| 514 |
static void scanelf_dir(const char *path) |
| 515 |
{ |
| 516 |
register DIR *dir; |
| 517 |
register struct dirent *dentry; |
| 518 |
struct stat st_top, st; |
| 519 |
char buf[_POSIX_PATH_MAX]; |
| 520 |
size_t pathlen = 0, len = 0; |
| 521 |
|
| 522 |
/* make sure path exists */ |
| 523 |
if (lstat(path, &st_top) == -1) { |
| 524 |
if (be_verbose > 2) printf("%s: does not exist\n", path); |
| 525 |
return; |
| 526 |
} |
| 527 |
|
| 528 |
/* ok, if it isn't a directory, assume we can open it */ |
| 529 |
if (!S_ISDIR(st_top.st_mode)) { |
| 530 |
scanelf_file(path); |
| 531 |
return; |
| 532 |
} |
| 533 |
|
| 534 |
/* now scan the dir looking for fun stuff */ |
| 535 |
if ((dir = opendir(path)) == NULL) { |
| 536 |
warnf("could not opendir %s: %s", path, strerror(errno)); |
| 537 |
return; |
| 538 |
} |
| 539 |
if (be_verbose) printf("%s: scanning dir\n", path); |
| 540 |
|
| 541 |
pathlen = strlen(path); |
| 542 |
while ((dentry = readdir(dir))) { |
| 543 |
if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) |
| 544 |
continue; |
| 545 |
len = (pathlen + 1 + strlen(dentry->d_name) + 1); |
| 546 |
if (len >= sizeof(buf)) { |
| 547 |
warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf)); |
| 548 |
continue; |
| 549 |
} |
| 550 |
sprintf(buf, "%s/%s", path, dentry->d_name); |
| 551 |
if (lstat(buf, &st) != -1) { |
| 552 |
if (S_ISREG(st.st_mode)) |
| 553 |
scanelf_file(buf); |
| 554 |
else if (dir_recurse && S_ISDIR(st.st_mode)) { |
| 555 |
if (dir_crossmount || (st_top.st_dev == st.st_dev)) |
| 556 |
scanelf_dir(buf); |
| 557 |
} |
| 558 |
} |
| 559 |
} |
| 560 |
closedir(dir); |
| 561 |
} |
| 562 |
|
| 563 |
static int scanelf_from_file(char *filename) |
| 564 |
{ |
| 565 |
FILE *fp = NULL; |
| 566 |
char *p; |
| 567 |
char path[_POSIX_PATH_MAX]; |
| 568 |
|
| 569 |
if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL)) |
| 570 |
fp = stdin; |
| 571 |
else if ((fp = fopen(filename, "r")) == NULL) |
| 572 |
return 1; |
| 573 |
|
| 574 |
while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { |
| 575 |
if ((p = strchr(path, '\n')) != NULL) |
| 576 |
*p = 0; |
| 577 |
scanelf_dir(path); |
| 578 |
} |
| 579 |
if (fp != stdin) |
| 580 |
fclose(fp); |
| 581 |
return 0; |
| 582 |
} |
| 583 |
|
| 584 |
static void load_ld_so_conf() |
| 585 |
{ |
| 586 |
FILE *fp = NULL; |
| 587 |
char *p; |
| 588 |
char path[_POSIX_PATH_MAX]; |
| 589 |
int i = 0; |
| 590 |
|
| 591 |
if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) |
| 592 |
return; |
| 593 |
|
| 594 |
while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) { |
| 595 |
if (*path != '/') |
| 596 |
continue; |
| 597 |
|
| 598 |
if ((p = strrchr(path, '\r')) != NULL) |
| 599 |
*p = 0; |
| 600 |
if ((p = strchr(path, '\n')) != NULL) |
| 601 |
*p = 0; |
| 602 |
|
| 603 |
ldpaths[i++] = xstrdup(path); |
| 604 |
|
| 605 |
if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths)) |
| 606 |
break; |
| 607 |
} |
| 608 |
ldpaths[i] = NULL; |
| 609 |
|
| 610 |
fclose(fp); |
| 611 |
} |
| 612 |
|
| 613 |
/* scan /etc/ld.so.conf for paths */ |
| 614 |
static void scanelf_ldpath() |
| 615 |
{ |
| 616 |
char scan_l, scan_ul, scan_ull; |
| 617 |
int i = 0; |
| 618 |
|
| 619 |
if (!ldpaths[0]) |
| 620 |
err("Unable to load any paths from ld.so.conf"); |
| 621 |
|
| 622 |
scan_l = scan_ul = scan_ull = 0; |
| 623 |
|
| 624 |
while (ldpaths[i]) { |
| 625 |
if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1; |
| 626 |
if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1; |
| 627 |
if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1; |
| 628 |
scanelf_dir(ldpaths[i]); |
| 629 |
++i; |
| 630 |
} |
| 631 |
|
| 632 |
if (!scan_l) scanelf_dir("/lib"); |
| 633 |
if (!scan_ul) scanelf_dir("/usr/lib"); |
| 634 |
if (!scan_ull) scanelf_dir("/usr/local/lib"); |
| 635 |
} |
| 636 |
|
| 637 |
/* scan env PATH for paths */ |
| 638 |
static void scanelf_envpath() |
| 639 |
{ |
| 640 |
char *path, *p; |
| 641 |
|
| 642 |
path = getenv("PATH"); |
| 643 |
if (!path) |
| 644 |
err("PATH is not set in your env !"); |
| 645 |
path = xstrdup(path); |
| 646 |
|
| 647 |
while ((p = strrchr(path, ':')) != NULL) { |
| 648 |
scanelf_dir(p + 1); |
| 649 |
*p = 0; |
| 650 |
} |
| 651 |
|
| 652 |
free(path); |
| 653 |
} |
| 654 |
|
| 655 |
|
| 656 |
|
| 657 |
/* usage / invocation handling functions */ |
| 658 |
#define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV" |
| 659 |
#define a_argument required_argument |
| 660 |
static struct option const long_opts[] = { |
| 661 |
{"path", no_argument, NULL, 'p'}, |
| 662 |
{"ldpath", no_argument, NULL, 'l'}, |
| 663 |
{"recursive", no_argument, NULL, 'R'}, |
| 664 |
{"mount", no_argument, NULL, 'm'}, |
| 665 |
{"symlink", no_argument, NULL, 'y'}, |
| 666 |
{"pax", no_argument, NULL, 'x'}, |
| 667 |
{"header", no_argument, NULL, 'e'}, |
| 668 |
{"textrel", no_argument, NULL, 't'}, |
| 669 |
{"rpath", no_argument, NULL, 'r'}, |
| 670 |
{"needed", no_argument, NULL, 'n'}, |
| 671 |
{"interp", no_argument, NULL, 'i'}, |
| 672 |
{"bind", no_argument, NULL, 'b'}, |
| 673 |
{"symbol", a_argument, NULL, 's'}, |
| 674 |
{"all", no_argument, NULL, 'a'}, |
| 675 |
{"quiet", no_argument, NULL, 'q'}, |
| 676 |
{"verbose", no_argument, NULL, 'v'}, |
| 677 |
{"format", a_argument, NULL, 'F'}, |
| 678 |
{"from", a_argument, NULL, 'f'}, |
| 679 |
{"file", a_argument, NULL, 'o'}, |
| 680 |
{"nobanner", no_argument, NULL, 'B'}, |
| 681 |
{"help", no_argument, NULL, 'h'}, |
| 682 |
{"version", no_argument, NULL, 'V'}, |
| 683 |
{NULL, no_argument, NULL, 0x0} |
| 684 |
}; |
| 685 |
static char *opts_help[] = { |
| 686 |
"Scan all directories in PATH environment", |
| 687 |
"Scan all directories in /etc/ld.so.conf", |
| 688 |
"Scan directories recursively", |
| 689 |
"Don't recursively cross mount points", |
| 690 |
"Don't scan symlinks\n", |
| 691 |
"Print PaX markings", |
| 692 |
"Print GNU_STACK markings", |
| 693 |
"Print TEXTREL information", |
| 694 |
"Print RPATH information", |
| 695 |
"Print NEEDED information", |
| 696 |
"Print INTERP information", |
| 697 |
"Print BIND information", |
| 698 |
"Find a specified symbol", |
| 699 |
"Print all scanned info (-x -e -t -r -n -i)\n", |
| 700 |
"Only output 'bad' things", |
| 701 |
"Be verbose (can be specified more than once)", |
| 702 |
"Use specified format for output", |
| 703 |
"Read input stream from a filename", |
| 704 |
"Write output stream to a filename", |
| 705 |
"Don't display the header", |
| 706 |
"Print this help and exit", |
| 707 |
"Print version and exit", |
| 708 |
NULL |
| 709 |
}; |
| 710 |
|
| 711 |
/* display usage and exit */ |
| 712 |
static void usage(int status) |
| 713 |
{ |
| 714 |
unsigned long i; |
| 715 |
printf("* Scan ELF binaries for stuff\n\n" |
| 716 |
"Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); |
| 717 |
printf("Options: -[%s]\n", PARSE_FLAGS); |
| 718 |
for (i = 0; long_opts[i].name; ++i) |
| 719 |
if (long_opts[i].has_arg == no_argument) |
| 720 |
printf(" -%c, --%-13s* %s\n", long_opts[i].val, |
| 721 |
long_opts[i].name, opts_help[i]); |
| 722 |
else |
| 723 |
printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val, |
| 724 |
long_opts[i].name, opts_help[i]); |
| 725 |
|
| 726 |
if (status != EXIT_SUCCESS) |
| 727 |
exit(status); |
| 728 |
|
| 729 |
puts("\nThe format modifiers for the -F option are:"); |
| 730 |
puts(" %F Filename \t%x PaX Flags \t%e STACK/RELRO"); |
| 731 |
puts(" %t TEXTREL \t%r RPATH \t%n NEEDED"); |
| 732 |
puts(" %i INTERP \t%b BIND \t%s symbol"); |
| 733 |
|
| 734 |
exit(status); |
| 735 |
} |
| 736 |
|
| 737 |
/* parse command line arguments and preform needed actions */ |
| 738 |
static void parseargs(int argc, char *argv[]) |
| 739 |
{ |
| 740 |
int i; |
| 741 |
char *from_file = NULL; |
| 742 |
|
| 743 |
opterr = 0; |
| 744 |
while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { |
| 745 |
switch (i) { |
| 746 |
|
| 747 |
case 'V': |
| 748 |
printf("%s compiled %s\n%s\n" |
| 749 |
"%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", |
| 750 |
__FILE__, __DATE__, rcsid, argv0); |
| 751 |
exit(EXIT_SUCCESS); |
| 752 |
break; |
| 753 |
case 'h': usage(EXIT_SUCCESS); break; |
| 754 |
case 'f': |
| 755 |
if (from_file == NULL) |
| 756 |
from_file = xstrdup(optarg); |
| 757 |
break; |
| 758 |
case 'o': { |
| 759 |
FILE *fp = NULL; |
| 760 |
fp = freopen(optarg, "w", stdout); |
| 761 |
if (fp == NULL) |
| 762 |
err("Could not open output stream '%s': %s", optarg, strerror(errno)); |
| 763 |
stdout = fp; |
| 764 |
break; |
| 765 |
} |
| 766 |
|
| 767 |
case 's': { |
| 768 |
size_t len; |
| 769 |
find_sym = xstrdup(optarg); |
| 770 |
len = strlen(find_sym) + 1; |
| 771 |
versioned_symname = (char*)xmalloc(sizeof(char) * (len+1)); |
| 772 |
sprintf(versioned_symname, "%s@", find_sym); |
| 773 |
break; |
| 774 |
} |
| 775 |
|
| 776 |
case 'F': { |
| 777 |
out_format = xstrdup(optarg); |
| 778 |
break; |
| 779 |
} |
| 780 |
|
| 781 |
case 'y': scan_symlink = 0; break; |
| 782 |
case 'B': show_banner = 0; break; |
| 783 |
case 'l': scan_ldpath = 1; break; |
| 784 |
case 'p': scan_envpath = 1; break; |
| 785 |
case 'R': dir_recurse = 1; break; |
| 786 |
case 'm': dir_crossmount = 0; break; |
| 787 |
case 'x': show_pax = 1; break; |
| 788 |
case 'e': show_stack = 1; break; |
| 789 |
case 't': show_textrel = 1; break; |
| 790 |
case 'r': show_rpath = 1; break; |
| 791 |
case 'n': show_needed = 1; break; |
| 792 |
case 'i': show_interp = 1; break; |
| 793 |
case 'b': show_bind = 1; break; |
| 794 |
case 'q': be_quiet = 1; break; |
| 795 |
case 'v': be_verbose = (be_verbose % 20) + 1; break; |
| 796 |
case 'a': show_pax = show_stack = show_textrel = show_rpath = \ |
| 797 |
show_needed = show_interp = show_bind = 1; break; |
| 798 |
|
| 799 |
case ':': |
| 800 |
err("Option missing parameter\n"); |
| 801 |
case '?': |
| 802 |
err("Unknown option\n"); |
| 803 |
default: |
| 804 |
err("Unhandled option '%c'", i); |
| 805 |
} |
| 806 |
} |
| 807 |
|
| 808 |
/* let the format option override all other options */ |
| 809 |
if (out_format) { |
| 810 |
show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0; |
| 811 |
for (i = 0; out_format[i]; ++i) { |
| 812 |
if (out_format[i] != '%') continue; |
| 813 |
|
| 814 |
switch (out_format[++i]) { |
| 815 |
case '%': break; |
| 816 |
case 'F': break; |
| 817 |
case 's': break; |
| 818 |
case 'o': break; |
| 819 |
case 'x': show_pax = 1; break; |
| 820 |
case 'e': show_stack = 1; break; |
| 821 |
case 't': show_textrel = 1; break; |
| 822 |
case 'r': show_rpath = 1; break; |
| 823 |
case 'n': show_needed = 1; break; |
| 824 |
case 'i': show_interp = 1; break; |
| 825 |
case 'b': show_bind = 1; break; |
| 826 |
default: |
| 827 |
err("Invalid format specifier '%c' (byte %i)", |
| 828 |
out_format[i], i+1); |
| 829 |
} |
| 830 |
} |
| 831 |
|
| 832 |
/* construct our default format */ |
| 833 |
} else { |
| 834 |
size_t fmt_len = 30; |
| 835 |
out_format = (char*)xmalloc(sizeof(char) * fmt_len); |
| 836 |
if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len); |
| 837 |
if (show_pax) xstrcat(&out_format, "%x ", &fmt_len); |
| 838 |
if (show_stack) xstrcat(&out_format, "%e ", &fmt_len); |
| 839 |
if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len); |
| 840 |
if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len); |
| 841 |
if (show_needed) xstrcat(&out_format, "%n ", &fmt_len); |
| 842 |
if (show_interp) xstrcat(&out_format, "%i ", &fmt_len); |
| 843 |
if (show_bind) xstrcat(&out_format, "%b ", &fmt_len); |
| 844 |
if (find_sym) xstrcat(&out_format, "%s ", &fmt_len); |
| 845 |
if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len); |
| 846 |
} |
| 847 |
if (be_verbose > 2) printf("Format: %s\n", out_format); |
| 848 |
|
| 849 |
/* now lets actually do the scanning */ |
| 850 |
if (scan_ldpath || (show_rpath && be_quiet)) |
| 851 |
load_ld_so_conf(); |
| 852 |
if (scan_ldpath) scanelf_ldpath(); |
| 853 |
if (scan_envpath) scanelf_envpath(); |
| 854 |
if (from_file) { |
| 855 |
scanelf_from_file(from_file); |
| 856 |
free(from_file); |
| 857 |
from_file = *argv; |
| 858 |
} |
| 859 |
if (optind == argc && !scan_ldpath && !scan_envpath && !from_file) |
| 860 |
err("Nothing to scan !?"); |
| 861 |
while (optind < argc) |
| 862 |
scanelf_dir(argv[optind++]); |
| 863 |
|
| 864 |
/* clean up */ |
| 865 |
if (find_sym) { |
| 866 |
free(find_sym); |
| 867 |
free(versioned_symname); |
| 868 |
} |
| 869 |
if (out_format) free(out_format); |
| 870 |
for (i = 0; ldpaths[i]; ++i) |
| 871 |
free(ldpaths[i]); |
| 872 |
} |
| 873 |
|
| 874 |
|
| 875 |
|
| 876 |
/* utility funcs */ |
| 877 |
static char *xstrdup(char *s) |
| 878 |
{ |
| 879 |
char *ret = strdup(s); |
| 880 |
if (!ret) err("Could not strdup(): %s", strerror(errno)); |
| 881 |
return ret; |
| 882 |
} |
| 883 |
static void *xmalloc(size_t size) |
| 884 |
{ |
| 885 |
void *ret = malloc(size); |
| 886 |
if (!ret) err("Could not malloc() %li bytes", (unsigned long)size); |
| 887 |
return ret; |
| 888 |
} |
| 889 |
static void xstrcat(char **dst, const char *src, size_t *curr_len) |
| 890 |
{ |
| 891 |
long new_len; |
| 892 |
|
| 893 |
new_len = strlen(*dst) + strlen(src); |
| 894 |
if (*curr_len <= new_len) { |
| 895 |
*curr_len = new_len + (*curr_len / 2); |
| 896 |
*dst = realloc(*dst, *curr_len); |
| 897 |
if (!*dst) |
| 898 |
err("could not realloc %li bytes", (unsigned long)*curr_len); |
| 899 |
} |
| 900 |
|
| 901 |
strcat(*dst, src); |
| 902 |
} |
| 903 |
static inline void xchrcat(char **dst, const char append, size_t *curr_len) |
| 904 |
{ |
| 905 |
static char my_app[2]; |
| 906 |
my_app[0] = append; |
| 907 |
my_app[1] = '\0'; |
| 908 |
xstrcat(dst, my_app, curr_len); |
| 909 |
} |
| 910 |
static int xemptybuffer(const char *buff) |
| 911 |
{ |
| 912 |
long i; |
| 913 |
for (i = 0; buff[i]; ++i) |
| 914 |
if (buff[i] != ' ') |
| 915 |
return 0; |
| 916 |
return 1; |
| 917 |
} |
| 918 |
|
| 919 |
|
| 920 |
|
| 921 |
int main(int argc, char *argv[]) |
| 922 |
{ |
| 923 |
if (argc < 2) |
| 924 |
usage(EXIT_FAILURE); |
| 925 |
parseargs(argc, argv); |
| 926 |
fclose(stdout); |
| 927 |
return EXIT_SUCCESS; |
| 928 |
} |
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