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/* |
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* Copyright 2003 Ned Ludd <solar@gentoo.org> |
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* Copyright 1999-2005 Gentoo Foundation |
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* Distributed under the terms of the GNU General Public License v2 |
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* $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.52 2005/05/18 14:37:21 solar Exp $ |
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* |
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******************************************************************** |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
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* MA 02111-1307, USA. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <sys/types.h> |
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#define __USE_GNU |
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#include <string.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include <sys/stat.h> |
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#include <dirent.h> |
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#include <getopt.h> |
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#include <assert.h> |
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|
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#include "paxelf.h" |
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|
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static const char *rcsid = "$Id: scanelf.c,v 1.52 2005/05/18 14:37:21 solar Exp $"; |
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#define argv0 "scanelf" |
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|
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|
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|
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/* prototypes */ |
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static void scanelf_file(const char *filename); |
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static void scanelf_dir(const char *path); |
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static void scanelf_ldpath(); |
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static void scanelf_envpath(); |
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static void usage(int status); |
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static void parseargs(int argc, char *argv[]); |
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static char *xstrdup(char *s); |
51 |
static void *xmalloc(size_t size); |
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static void xstrcat(char **dst, const char *src, size_t *curr_len); |
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static inline void xchrcat(char **dst, const char append, size_t *curr_len); |
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static int xemptybuffer(const char *buff); |
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|
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/* variables to control behavior */ |
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static char *ldpaths[256]; |
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static char scan_ldpath = 0; |
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static char scan_envpath = 0; |
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static char scan_symlink = 1; |
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static char dir_recurse = 0; |
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static char dir_crossmount = 1; |
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static char show_pax = 0; |
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static char show_stack = 0; |
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static char show_textrel = 0; |
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static char show_rpath = 0; |
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static char show_needed = 0; |
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static char show_interp = 0; |
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static char show_bind = 0; |
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static char show_banner = 1; |
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static char be_quiet = 0; |
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static char be_verbose = 0; |
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static char *find_sym = NULL, *versioned_symname = NULL; |
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static char *out_format = NULL; |
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|
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|
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|
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/* sub-funcs for scanelf_file() */ |
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static char *scanelf_file_pax(elfobj *elf, char *found_pax) |
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{ |
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static char *paxflags; |
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|
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if (!show_pax) return NULL; |
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|
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paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); |
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if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { |
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*found_pax = 1; |
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return paxflags; |
89 |
} |
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|
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return NULL; |
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} |
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static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro) |
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{ |
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static char ret[8]; |
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char *found; |
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unsigned long i, off, shown; |
98 |
|
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if (!show_stack) return NULL; |
100 |
|
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shown = 0; |
102 |
strcpy(ret, "--- ---"); |
103 |
|
104 |
if (elf->phdr) { |
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#define SHOW_STACK(B) \ |
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if (elf->elf_class == ELFCLASS ## B) { \ |
107 |
Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
108 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
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for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
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if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \ |
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found = found_stack; \ |
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off = 0; \ |
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} else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \ |
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found = found_relro; \ |
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off = 4; \ |
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} else \ |
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continue; \ |
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if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ |
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continue; \ |
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memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \ |
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*found = 1; \ |
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++shown; \ |
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} \ |
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} |
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SHOW_STACK(32) |
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SHOW_STACK(64) |
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} |
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|
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if (be_quiet && !shown) |
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return NULL; |
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else |
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return ret; |
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} |
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static char *scanelf_file_textrel(elfobj *elf, char *found_textrel) |
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{ |
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static char *ret = "TEXTREL"; |
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unsigned long i; |
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|
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if (!show_textrel) return NULL; |
140 |
|
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if (elf->phdr) { |
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#define SHOW_TEXTREL(B) \ |
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if (elf->elf_class == ELFCLASS ## B) { \ |
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Elf ## B ## _Dyn *dyn; \ |
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Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
146 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
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Elf ## B ## _Off offset; \ |
148 |
for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ |
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if (phdr[i].p_type != PT_DYNAMIC) continue; \ |
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offset = EGET(phdr[i].p_offset); \ |
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if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \ |
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dyn = DYN ## B (elf->data + offset); \ |
153 |
while (EGET(dyn->d_tag) != DT_NULL) { \ |
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if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ |
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*found_textrel = 1; \ |
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/*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ |
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return ret; \ |
158 |
} \ |
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++dyn; \ |
160 |
} \ |
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} } |
162 |
SHOW_TEXTREL(32) |
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SHOW_TEXTREL(64) |
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} |
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|
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if (be_quiet) |
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return NULL; |
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else |
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return " - "; |
170 |
} |
171 |
static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len) |
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{ |
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/* TODO: when checking RPATH entries, check each subpath (between :) in ld.so.conf */ |
174 |
unsigned long i, s; |
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char *rpath, *runpath, **r; |
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void *strtbl_void; |
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|
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if (!show_rpath) return; |
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|
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strtbl_void = elf_findsecbyname(elf, ".dynstr"); |
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rpath = runpath = NULL; |
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|
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if (elf->phdr && strtbl_void) { |
184 |
#define SHOW_RPATH(B) \ |
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if (elf->elf_class == ELFCLASS ## B) { \ |
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Elf ## B ## _Dyn *dyn; \ |
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Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ |
188 |
Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ |
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Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ |
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Elf ## B ## _Off offset; \ |
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Elf ## B ## _Sxword word; \ |
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/* 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; \ |
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} \ |
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 |
} |