/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.26 Revision 1.40
1/* 1/*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org> 2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation 3 * Copyright 1999-2005 Gentoo Foundation
4 * Distributed under the terms of the GNU General Public License v2 4 * Distributed under the terms of the GNU General Public License v2
5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.26 2005/04/05 00:51:33 vapier Exp $ 5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.40 2005/04/21 00:13:03 solar Exp $
6 * 6 *
7 ******************************************************************** 7 ********************************************************************
8 * This program is free software; you can redistribute it and/or 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 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 10 * published by the Free Software Foundation; either version 2 of the
22 */ 22 */
23 23
24#include <stdio.h> 24#include <stdio.h>
25#include <stdlib.h> 25#include <stdlib.h>
26#include <sys/types.h> 26#include <sys/types.h>
27#define __USE_GNU
27#include <string.h> 28#include <string.h>
28#include <errno.h> 29#include <errno.h>
29#include <unistd.h> 30#include <unistd.h>
30#include <sys/stat.h> 31#include <sys/stat.h>
31#include <dirent.h> 32#include <dirent.h>
32#include <getopt.h> 33#include <getopt.h>
33#include <assert.h> 34#include <assert.h>
34 35
35#include "paxelf.h" 36#include "paxelf.h"
36 37
37static const char *rcsid = "$Id: scanelf.c,v 1.26 2005/04/05 00:51:33 vapier Exp $"; 38static const char *rcsid = "$Id: scanelf.c,v 1.40 2005/04/21 00:13:03 solar Exp $";
38 39#define argv0 "scanelf"
39
40/* helper functions for showing errors */
41#define argv0 "scanelf" /*((*argv != NULL) ? argv[0] : __FILE__ "\b\b")*/
42#define warn(fmt, args...) \
43 fprintf(stderr, "%s: " fmt "\n", argv0, ## args)
44#define warnf(fmt, args...) warn("%s(): " fmt, __FUNCTION__, ## args)
45#define err(fmt, args...) \
46 do { \
47 warn(fmt, ## args); \
48 exit(EXIT_FAILURE); \
49 } while (0)
50 40
51 41
52 42
53/* prototypes */ 43/* prototypes */
54static void scanelf_file(const char *filename); 44static void scanelf_file(const char *filename);
59static void parseargs(int argc, char *argv[]); 49static void parseargs(int argc, char *argv[]);
60 50
61/* variables to control behavior */ 51/* variables to control behavior */
62static char scan_ldpath = 0; 52static char scan_ldpath = 0;
63static char scan_envpath = 0; 53static char scan_envpath = 0;
54static char scan_symlink = 1;
64static char dir_recurse = 0; 55static char dir_recurse = 0;
65static char dir_crossmount = 1; 56static char dir_crossmount = 1;
66static char show_pax = 0; 57static char show_pax = 0;
67static char show_stack = 0; 58static char show_stack = 0;
68static char show_textrel = 0; 59static char show_textrel = 0;
69static char show_rpath = 0; 60static char show_rpath = 0;
61static char show_needed = 0;
62static char show_interp = 0;
70static char show_banner = 1; 63static char show_banner = 1;
71static char be_quiet = 0; 64static char be_quiet = 0;
72static char be_verbose = 0; 65static char be_verbose = 0;
66static char *find_sym = NULL, *versioned_symname = NULL;
67static char *out_format = NULL;
73 68
74 69
75 70
76/* scan an elf file and show all the fun stuff */ 71/* sub-funcs for scanelf_file() */
77static void scanelf_file(const char *filename) 72static void scanelf_file_pax(elfobj *elf, char *found_pax)
73{
74 char *paxflags;
75 if (!show_pax) return;
76
77 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
78 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
79 *found_pax = 1;
80 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
81 }
82}
83static void scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
78{ 84{
79 int i; 85 int i;
80 char found_pax, found_stack, found_relro, found_textrel, found_rpath;
81 elfobj *elf;
82
83 found_pax = found_stack = found_relro = found_textrel = found_rpath = 0;
84
85 /* verify this is real ELF */
86 if ((elf = readelf(filename)) == NULL) {
87 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
88 return;
89 }
90
91 if (be_verbose > 1)
92 printf("%s: {%s,%s} scanning file\n", filename,
93 get_elfeitype(elf, EI_CLASS, elf->elf_class),
94 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
95 else if (be_verbose)
96 printf("%s: scanning file\n", filename);
97
98 /* show the header */
99 if (!be_quiet && show_banner) {
100 printf(" TYPE ");
101 if (show_pax) printf(" PAX ");
102 if (show_stack) printf(" STK/REL ");
103 if (show_textrel) printf("TEXTREL ");
104 if (show_rpath) printf("RPATH ");
105 printf(" FILE\n");
106 show_banner = 0;
107 }
108
109 /* dump all the good stuff */
110 if (!be_quiet)
111 printf("%-7s ", get_elfetype(elf));
112
113 if (show_pax) {
114 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
115 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
116 found_pax = 1;
117 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
118 }
119 }
120
121 /* stack fun */
122 if (show_stack) { 86 if (!show_stack) return;
123#define SHOW_STACK(B) \ 87#define SHOW_STACK(B) \
124 if (elf->elf_class == ELFCLASS ## B) { \ 88 if (elf->elf_class == ELFCLASS ## B) { \
125 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 89 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
126 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 90 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
127 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 91 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
128 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 92 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \
129 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \ 93 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \
130 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 94 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
131 continue; \ 95 continue; \
132 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \ 96 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \
133 found_stack = 1; \ 97 *found_stack = 1; \
134 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \ 98 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \
135 found_relro = 1; \ 99 *found_relro = 1; \
136 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \ 100 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \
101 } \
102 }
103 SHOW_STACK(32)
104 SHOW_STACK(64)
105 if (!be_quiet && !*found_stack) printf("--- ");
106 if (!be_quiet && !*found_relro) printf("--- ");
107}
108static void scanelf_file_textrel(elfobj *elf, char *found_textrel)
109{
110 int i;
111 if (!show_textrel) return;
112#define SHOW_TEXTREL(B) \
113 if (elf->elf_class == ELFCLASS ## B) { \
114 Elf ## B ## _Dyn *dyn; \
115 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
116 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
117 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
118 if (phdr[i].p_type != PT_DYNAMIC) continue; \
119 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
120 while (EGET(dyn->d_tag) != DT_NULL) { \
121 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
122 *found_textrel = 1; \
123 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
124 printf("TEXTREL "); \
125 } \
126 ++dyn; \
137 } \ 127 } \
138 }
139 SHOW_STACK(32)
140 SHOW_STACK(64)
141 if (!be_quiet && !found_stack) printf("--- ");
142 if (!be_quiet && !found_relro) printf("--- ");
143 }
144
145 /* textrel fun */
146 if (show_textrel) {
147#define SHOW_TEXTREL(B) \
148 if (elf->elf_class == ELFCLASS ## B) { \
149 Elf ## B ## _Dyn *dyn; \
150 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
151 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
152 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
153 if (phdr[i].p_type != PT_DYNAMIC) continue; \
154 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
155 while (EGET(dyn->d_tag) != DT_NULL) { \
156 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
157 found_textrel = 1; \
158 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
159 printf("TEXTREL "); \
160 } \
161 ++dyn; \
162 } \
163 } } 128 } }
164 SHOW_TEXTREL(32) 129 SHOW_TEXTREL(32)
165 SHOW_TEXTREL(64) 130 SHOW_TEXTREL(64)
166 if (!be_quiet && !found_textrel) printf("------- "); 131 if (!be_quiet && !*found_textrel) printf("------- ");
167 } 132}
168 133static void scanelf_file_rpath(elfobj *elf, char *found_rpath)
169 /* rpath fun */ 134{
170 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 135 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
171 if (show_rpath) { 136 int i;
172 char *rpath, *runpath; 137 char *rpath, *runpath;
138 void *strtbl_void;
139
140 if (!show_rpath) return;
141
173 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 142 strtbl_void = elf_findsecbyname(elf, ".dynstr");
174 rpath = runpath = NULL; 143 rpath = runpath = NULL;
175 144
176 if (strtbl_void) { 145 if (strtbl_void) {
177#define SHOW_RPATH(B) \ 146#define SHOW_RPATH(B) \
178 if (elf->elf_class == ELFCLASS ## B) { \ 147 if (elf->elf_class == ELFCLASS ## B) { \
179 Elf ## B ## _Dyn *dyn; \ 148 Elf ## B ## _Dyn *dyn; \
180 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 149 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
181 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 150 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
184 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 153 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
185 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 154 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
186 while (EGET(dyn->d_tag) != DT_NULL) { \ 155 while (EGET(dyn->d_tag) != DT_NULL) { \
187 if (EGET(dyn->d_tag) == DT_RPATH) { \ 156 if (EGET(dyn->d_tag) == DT_RPATH) { \
188 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 157 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
189 found_rpath = 1; \ 158 *found_rpath = 1; \
190 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 159 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
191 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 160 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
192 found_rpath = 1; \ 161 *found_rpath = 1; \
193 } \ 162 } \
194 ++dyn; \ 163 ++dyn; \
195 } \ 164 } \
196 } } 165 } }
197 SHOW_RPATH(32) 166 SHOW_RPATH(32)
198 SHOW_RPATH(64) 167 SHOW_RPATH(64)
199 } 168 }
200 if (rpath && runpath) { 169 if (rpath && runpath) {
201 if (!strcmp(rpath, runpath)) 170 if (!strcmp(rpath, runpath))
202 printf("%-5s ", runpath); 171 printf("%-5s ", runpath);
203 else { 172 else {
204 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 173 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
205 printf("{%s,%s} ", rpath, runpath); 174 printf("{%s,%s} ", rpath, runpath);
175 }
176 } else if (rpath || runpath)
177 printf("%-5s ", (runpath ? runpath : rpath));
178 else if (!be_quiet && !*found_rpath)
179 printf(" - ");
180}
181static void scanelf_file_needed(elfobj *elf, char *found_needed)
182{
183 int i;
184 char *needed;
185 void *strtbl_void;
186
187 if (!show_needed) return;
188
189 strtbl_void = elf_findsecbyname(elf, ".dynstr");
190
191 if (strtbl_void) {
192#define SHOW_NEEDED(B) \
193 if (elf->elf_class == ELFCLASS ## B) { \
194 Elf ## B ## _Dyn *dyn; \
195 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
196 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
197 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
198 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
199 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
200 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
201 while (EGET(dyn->d_tag) != DT_NULL) { \
202 if (EGET(dyn->d_tag) == DT_NEEDED) { \
203 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 if (*found_needed) printf(","); \
205 printf("%s", needed); \
206 *found_needed = 1; \
207 } \
208 ++dyn; \
209 } \
210 } }
211 SHOW_NEEDED(32)
212 SHOW_NEEDED(64)
213 }
214 if (!be_quiet && !*found_needed)
215 printf(" - ");
216 else if (*found_needed)
217 printf(" ");
218}
219static void scanelf_file_interp(elfobj *elf, char *found_interp)
220{
221 void *strtbl_void;
222
223 if (!show_interp) return;
224
225 strtbl_void = elf_findsecbyname(elf, ".interp");
226
227 if (strtbl_void) {
228#define SHOW_INTERP(B) \
229 if (elf->elf_class == ELFCLASS ## B) { \
230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
231 printf("%s ", elf->data + EGET(strtbl->sh_offset)); \
232 *found_interp = 1; \
233 }
234 SHOW_INTERP(32)
235 SHOW_INTERP(64)
236 }
237 if (!be_quiet && !*found_interp)
238 printf(" - ");
239 else if (*found_interp)
240 printf(" ");
241}
242static void scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
243{
244 int i;
245 void *symtab_void, *strtab_void;
246
247 if (!find_sym) return;
248
249 symtab_void = elf_findsecbyname(elf, ".symtab");
250 strtab_void = elf_findsecbyname(elf, ".strtab");
251
252 if (symtab_void && strtab_void) {
253#define FIND_SYM(B) \
254 if (elf->elf_class == ELFCLASS ## B) { \
255 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
256 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
257 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
258 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
259 char *symname; \
260 for (i = 0; i < cnt; ++i) { \
261 if (sym->st_name) { \
262 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
263 if (*find_sym == '*') { \
264 printf("%s(%s) %5lX %15s %s\n", \
265 ((*found_sym == 0) ? "\n\t" : "\t"), \
266 (char *)basename(filename), \
267 (long)sym->st_size, \
268 (char *)get_elfstttype(sym->st_info), \
269 symname); \
270 *found_sym = 1; \
271 } else if ((strcmp(find_sym, symname) == 0) || \
272 (strcmp(symname, versioned_symname) == 0)) \
273 (*found_sym)++; \
274 } \
275 ++sym; \
276 } }
277 FIND_SYM(32)
278 FIND_SYM(64)
279 }
280 if (*find_sym != '*') {
281 if (*found_sym)
282 printf(" %s ", find_sym);
283 else if (!be_quiet)
284 printf(" - ");
285 }
286}
287/* scan an elf file and show all the fun stuff */
288static void scanelf_file(const char *filename)
289{
290 int i;
291 char found_pax, found_stack, found_relro, found_textrel,
292 found_rpath, found_needed, found_interp, found_sym,
293 found_file;
294 elfobj *elf;
295 struct stat st;
296
297 /* make sure 'filename' exists */
298 if (lstat(filename, &st) == -1) {
299 if (be_verbose > 2) printf("%s: does not exist\n", filename);
300 return;
301 }
302 /* always handle regular files and handle symlinked files if no -y */
303 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
304 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
305 return;
306 }
307
308 found_pax = found_stack = found_relro = found_textrel = \
309 found_rpath = found_needed = found_interp = found_sym = \
310 found_file = 0;
311
312 /* verify this is real ELF */
313 if ((elf = readelf(filename)) == NULL) {
314 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
315 return;
316 }
317
318 if (be_verbose > 1)
319 printf("%s: {%s,%s} scanning file\n", filename,
320 get_elfeitype(elf, EI_CLASS, elf->elf_class),
321 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
322 else if (be_verbose)
323 printf("%s: scanning file\n", filename);
324
325 /* show the header */
326 if (!be_quiet && show_banner) {
327 if (out_format) {
328 for (i=0; out_format[i]; ++i) {
329 if (out_format[i] != '%') continue;
330
331 switch (out_format[++i]) {
332 case '%': break;
333 case 'F': printf("FILE "); break;
334 case 'x': printf(" PAX "); break;
335 case 'e': printf("STK/REL "); break;
336 case 't': printf("TEXTREL "); break;
337 case 'r': printf("RPATH "); break;
338 case 'n': printf("NEEDED "); break;
339 case 'i': printf("INTERP "); break;
340 case 's': printf("SYM "); break;
341 }
206 } 342 }
207 } else if (rpath || runpath) 343 } else {
208 printf("%-5s ", (runpath ? runpath : rpath));
209 else if (!be_quiet && !found_rpath)
210 printf(" - "); 344 printf(" TYPE ");
345 if (show_pax) printf(" PAX ");
346 if (show_stack) printf("STK/REL ");
347 if (show_textrel) printf("TEXTREL ");
348 if (show_rpath) printf("RPATH ");
349 if (show_needed) printf("NEEDED ");
350 if (show_interp) printf("INTERP ");
351 if (find_sym) printf("SYM ");
211 } 352 }
353 if (!found_file) printf(" FILE");
354 printf("\n");
355 show_banner = 0;
356 }
212 357
358 /* dump all the good stuff */
359 if (!be_quiet && !out_format)
360 printf("%-7s ", get_elfetype(elf));
361
362 if (out_format) {
363 for (i=0; out_format[i]; ++i) {
364 if (out_format[i] != '%') {
365 printf("%c", out_format[i]);
366 continue;
367 }
368
369 switch (out_format[++i]) {
370 case '%': printf("%%"); break;
371 case 'F': found_file = 1; printf("%s ", filename); break;
372 case 'x': scanelf_file_pax(elf, &found_pax); break;
373 case 'e': scanelf_file_stack(elf, &found_stack, &found_relro); break;
374 case 't': scanelf_file_textrel(elf, &found_textrel); break;
375 case 'r': scanelf_file_rpath(elf, &found_rpath); break;
376 case 'n': scanelf_file_needed(elf, &found_needed); break;
377 case 'i': scanelf_file_interp(elf, &found_interp); break;
378 case 's': scanelf_file_sym(elf, &found_sym, filename); break;
379 }
380 }
381 } else {
382 scanelf_file_pax(elf, &found_pax);
383 scanelf_file_stack(elf, &found_stack, &found_relro);
384 scanelf_file_textrel(elf, &found_textrel);
385 scanelf_file_rpath(elf, &found_rpath);
386 scanelf_file_needed(elf, &found_needed);
387 scanelf_file_interp(elf, &found_interp);
388 scanelf_file_sym(elf, &found_sym, filename);
389 }
390
391 if (!found_file) {
213 if (!be_quiet || found_pax || found_stack || found_textrel || found_rpath) 392 if (!be_quiet || found_pax || found_stack || found_textrel || \
393 found_rpath || found_needed || found_sym)
214 puts(filename); 394 puts(filename);
395 } else {
396 printf("\n");
397 }
215 398
216 unreadelf(elf); 399 unreadelf(elf);
217} 400}
218 401
219/* scan a directory for ET_EXEC files and print when we find one */ 402/* scan a directory for ET_EXEC files and print when we find one */
221{ 404{
222 register DIR *dir; 405 register DIR *dir;
223 register struct dirent *dentry; 406 register struct dirent *dentry;
224 struct stat st_top, st; 407 struct stat st_top, st;
225 char buf[_POSIX_PATH_MAX]; 408 char buf[_POSIX_PATH_MAX];
226 size_t len = 0; 409 size_t pathlen = 0, len = 0;
227 410
228 /* make sure path exists */ 411 /* make sure path exists */
229 if (lstat(path, &st_top) == -1) 412 if (lstat(path, &st_top) == -1) {
413 if (be_verbose > 2) printf("%s: does not exist\n", path);
230 return; 414 return;
415 }
231 416
232 /* ok, if it isn't a directory, assume we can open it */ 417 /* ok, if it isn't a directory, assume we can open it */
233 if (!S_ISDIR(st_top.st_mode)) { 418 if (!S_ISDIR(st_top.st_mode)) {
234 scanelf_file(path); 419 scanelf_file(path);
235 return; 420 return;
240 warnf("could not opendir %s: %s", path, strerror(errno)); 425 warnf("could not opendir %s: %s", path, strerror(errno));
241 return; 426 return;
242 } 427 }
243 if (be_verbose) printf("%s: scanning dir\n", path); 428 if (be_verbose) printf("%s: scanning dir\n", path);
244 429
430 pathlen = strlen(path);
245 while ((dentry = readdir(dir))) { 431 while ((dentry = readdir(dir))) {
246 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 432 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
247 continue; 433 continue;
248 len = (strlen(path) + 2 + strlen(dentry->d_name)); 434 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
249 assert(len < sizeof(buf)); 435 if (len >= sizeof(buf)) {
250 strncpy(buf, path, len); 436 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
251 strncat(buf, "/", len); 437 continue;
252 strncat(buf, dentry->d_name, len); 438 }
253 buf[sizeof(buf)] = 0; 439 sprintf(buf, "%s/%s", path, dentry->d_name);
254 if (lstat(buf, &st) != -1) { 440 if (lstat(buf, &st) != -1) {
255 if (S_ISREG(st.st_mode)) 441 if (S_ISREG(st.st_mode))
256 scanelf_file(buf); 442 scanelf_file(buf);
257 else if (dir_recurse && S_ISDIR(st.st_mode)) { 443 else if (dir_recurse && S_ISDIR(st.st_mode)) {
258 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 444 if (dir_crossmount || (st_top.st_dev == st.st_dev))
273 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 459 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
274 err("Unable to open ld.so.conf: %s", strerror(errno)); 460 err("Unable to open ld.so.conf: %s", strerror(errno));
275 461
276 scan_l = scan_ul = scan_ull = 0; 462 scan_l = scan_ul = scan_ull = 0;
277 463
278 path = malloc(_POSIX_PATH_MAX); 464 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) {
465 warn("Can not malloc() memory for ldpath scanning");
466 return;
467 }
279 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 468 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
280 if (*path == '/') { 469 if (*path == '/') {
281 if ((p = strrchr(path, '\r')) != NULL) 470 if ((p = strrchr(path, '\r')) != NULL)
282 *p = 0; 471 *p = 0;
283 if ((p = strrchr(path, '\n')) != NULL) 472 if ((p = strrchr(path, '\n')) != NULL)
286 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 475 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1;
287 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 476 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
288 scanelf_dir(path); 477 scanelf_dir(path);
289 } 478 }
290 free(path); 479 free(path);
480 fclose(fp);
291 481
292 if (!scan_l) scanelf_dir("/lib"); 482 if (!scan_l) scanelf_dir("/lib");
293 if (!scan_ul) scanelf_dir("/usr/lib"); 483 if (!scan_ul) scanelf_dir("/usr/lib");
294 if (!scan_ull) scanelf_dir("/usr/local/lib"); 484 if (!scan_ull) scanelf_dir("/usr/local/lib");
295
296 fclose(fp);
297} 485}
298 486
299/* scan env PATH for paths */ 487/* scan env PATH for paths */
300static void scanelf_envpath() 488static void scanelf_envpath()
301{ 489{
304 path = getenv("PATH"); 492 path = getenv("PATH");
305 if (!path) 493 if (!path)
306 err("PATH is not set in your env !"); 494 err("PATH is not set in your env !");
307 495
308 if ((path = strdup(path)) == NULL) 496 if ((path = strdup(path)) == NULL)
309 err("stdup failed: %s", strerror(errno)); 497 err("strdup failed: %s", strerror(errno));
310 498
311 while ((p = strrchr(path, ':')) != NULL) { 499 while ((p = strrchr(path, ':')) != NULL) {
312 scanelf_dir(p + 1); 500 scanelf_dir(p + 1);
313 *p = 0; 501 *p = 0;
314 } 502 }
317} 505}
318 506
319 507
320 508
321/* usage / invocation handling functions */ 509/* usage / invocation handling functions */
322#define PARSE_FLAGS "plRmxetraqvo:BhV" 510#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV"
511#define a_argument required_argument
323static struct option const long_opts[] = { 512static struct option const long_opts[] = {
324 {"path", no_argument, NULL, 'p'}, 513 {"path", no_argument, NULL, 'p'},
325 {"ldpath", no_argument, NULL, 'l'}, 514 {"ldpath", no_argument, NULL, 'l'},
326 {"recursive", no_argument, NULL, 'R'}, 515 {"recursive", no_argument, NULL, 'R'},
327 {"mount", no_argument, NULL, 'm'}, 516 {"mount", no_argument, NULL, 'm'},
517 {"symlink", no_argument, NULL, 'y'},
328 {"pax", no_argument, NULL, 'x'}, 518 {"pax", no_argument, NULL, 'x'},
329 {"header", no_argument, NULL, 'e'}, 519 {"header", no_argument, NULL, 'e'},
330 {"textrel", no_argument, NULL, 't'}, 520 {"textrel", no_argument, NULL, 't'},
331 {"rpath", no_argument, NULL, 'r'}, 521 {"rpath", no_argument, NULL, 'r'},
522 {"needed", no_argument, NULL, 'n'},
523 {"interp", no_argument, NULL, 'i'},
524 {"symbol", a_argument, NULL, 's'},
332 {"all", no_argument, NULL, 'a'}, 525 {"all", no_argument, NULL, 'a'},
333 {"quiet", no_argument, NULL, 'q'}, 526 {"quiet", no_argument, NULL, 'q'},
334 {"verbose", no_argument, NULL, 'v'}, 527 {"verbose", no_argument, NULL, 'v'},
528 {"format", a_argument, NULL, 'F'},
335 {"file",required_argument, NULL, 'o'}, 529 {"file", a_argument, NULL, 'o'},
336 {"nobanner", no_argument, NULL, 'B'}, 530 {"nobanner", no_argument, NULL, 'B'},
337 {"help", no_argument, NULL, 'h'}, 531 {"help", no_argument, NULL, 'h'},
338 {"version", no_argument, NULL, 'V'}, 532 {"version", no_argument, NULL, 'V'},
339 {NULL, no_argument, NULL, 0x0} 533 {NULL, no_argument, NULL, 0x0}
340}; 534};
341static char *opts_help[] = { 535static char *opts_help[] = {
342 "Scan all directories in PATH environment", 536 "Scan all directories in PATH environment",
343 "Scan all directories in /etc/ld.so.conf", 537 "Scan all directories in /etc/ld.so.conf",
344 "Scan directories recursively", 538 "Scan directories recursively",
345 "Don't recursively cross mount points\n", 539 "Don't recursively cross mount points",
540 "Don't scan symlinks\n",
346 "Print PaX markings", 541 "Print PaX markings",
347 "Print GNU_STACK markings", 542 "Print GNU_STACK markings",
348 "Print TEXTREL information", 543 "Print TEXTREL information",
349 "Print RPATH information", 544 "Print RPATH information",
545 "Print NEEDED information",
546 "Print INTERP information",
547 "Find a specified symbol",
350 "Print all scanned info (-x -e -t -r)\n", 548 "Print all scanned info (-x -e -t -r)\n",
351 "Only output 'bad' things", 549 "Only output 'bad' things",
352 "Be verbose (can be specified more than once)", 550 "Be verbose (can be specified more than once)",
551 "Use specified format for output",
353 "Write output stream to a filename", 552 "Write output stream to a filename",
354 "Don't display the header", 553 "Don't display the header",
355 "Print this help and exit", 554 "Print this help and exit",
356 "Print version and exit", 555 "Print version and exit",
357 NULL 556 NULL
360/* display usage and exit */ 559/* display usage and exit */
361static void usage(int status) 560static void usage(int status)
362{ 561{
363 int i; 562 int i;
364 printf(" Scan ELF binaries for stuff\n\n" 563 printf(" Scan ELF binaries for stuff\n\n"
365 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 564 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
366 printf("Options:\n"); 565 printf("Options: -[%s]\n", PARSE_FLAGS);
367 for (i = 0; long_opts[i].name; ++i) 566 for (i = 0; long_opts[i].name; ++i)
567 if (long_opts[i].has_arg == no_argument)
368 printf(" -%c, --%-12s %s\n", long_opts[i].val, 568 printf(" -%c, --%-13s %s\n", long_opts[i].val,
369 long_opts[i].name, opts_help[i]); 569 long_opts[i].name, opts_help[i]);
370#ifdef MANLYPAGE 570 else
371 for (i = 0; long_opts[i].name; ++i) 571 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val,
372 printf(".TP\n\\fB\\-%c, \\-\\-%s\\fR\n%s\n", long_opts[i].val,
373 long_opts[i].name, opts_help[i]); 572 long_opts[i].name, opts_help[i]);
374#endif
375 exit(status); 573 exit(status);
376} 574}
377 575
378/* parse command line arguments and preform needed actions */ 576/* parse command line arguments and preform needed actions */
379static void parseargs(int argc, char *argv[]) 577static void parseargs(int argc, char *argv[])
382 580
383 opterr = 0; 581 opterr = 0;
384 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 582 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
385 switch (flag) { 583 switch (flag) {
386 584
387 case 'V': /* version info */ 585 case 'V':
388 printf("%s compiled %s\n%s\n" 586 printf("%s compiled %s\n%s\n"
389 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 587 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
390 __FILE__, __DATE__, rcsid, argv0); 588 __FILE__, __DATE__, rcsid, argv0);
391 exit(EXIT_SUCCESS); 589 exit(EXIT_SUCCESS);
392 break; 590 break;
393 case 's': /* reserved for -s, --symbol= */
394 case 'h': usage(EXIT_SUCCESS); break; 591 case 'h': usage(EXIT_SUCCESS); break;
395 592
396 case 'o': { 593 case 'o': {
397 FILE *fp = NULL; 594 FILE *fp = NULL;
398 fp = freopen(optarg, "w", stdout); 595 fp = freopen(optarg, "w", stdout);
400 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 597 err("Could not open output stream '%s': %s", optarg, strerror(errno));
401 stdout = fp; 598 stdout = fp;
402 break; 599 break;
403 } 600 }
404 601
602 case 's': {
603 size_t len;
604 find_sym = strdup(optarg);
605 if (!find_sym) {
606 warnf("Could not malloc() mem for sym scan");
607 find_sym = NULL;
608 break;
609 }
610 len = strlen(find_sym) + 1;
611 versioned_symname = (char *)malloc(sizeof(char) * (len+1));
612 if (!versioned_symname) {
613 free(find_sym);
614 find_sym = NULL;
615 warnf("Could not malloc() mem for sym scan");
616 break;
617 }
618 sprintf(versioned_symname, "%s@", find_sym);
619 break;
620 }
621
622 case 'F': {
623 out_format = strdup(optarg);
624 if (!out_format)
625 err("Could not malloc() mem for output format");
626 break;
627 }
628
629 case 'y': scan_symlink = 0; break;
405 case 'B': show_banner = 0; break; 630 case 'B': show_banner = 0; break;
406 case 'l': scan_ldpath = 1; break; 631 case 'l': scan_ldpath = 1; break;
407 case 'p': scan_envpath = 1; break; 632 case 'p': scan_envpath = 1; break;
408 case 'R': dir_recurse = 1; break; 633 case 'R': dir_recurse = 1; break;
409 case 'm': dir_crossmount = 0; break; 634 case 'm': dir_crossmount = 0; break;
410 case 'x': show_pax = 1; break; 635 case 'x': show_pax = 1; break;
411 case 'e': show_stack = 1; break; 636 case 'e': show_stack = 1; break;
412 case 't': show_textrel = 1; break; 637 case 't': show_textrel = 1; break;
413 case 'r': show_rpath = 1; break; 638 case 'r': show_rpath = 1; break;
639 case 'n': show_needed = 1; break;
640 case 'i': show_interp = 1; break;
414 case 'q': be_quiet = 1; break; 641 case 'q': be_quiet = 1; break;
415 case 'v': be_verbose = (be_verbose % 20) + 1; break; 642 case 'v': be_verbose = (be_verbose % 20) + 1; break;
416 case 'a': show_pax = show_stack = show_textrel = show_rpath = 1; break; 643 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break;
417 644
418 case ':': 645 case ':':
419 warn("Option missing parameter"); 646 warn("Option missing parameter\n");
420 usage(EXIT_FAILURE); 647 usage(EXIT_FAILURE);
421 break; 648 break;
422 case '?': 649 case '?':
423 warn("Unknown option"); 650 warn("Unknown option\n");
424 usage(EXIT_FAILURE); 651 usage(EXIT_FAILURE);
425 break; 652 break;
426 default: 653 default:
427 err("Unhandled option '%c'", flag); 654 err("Unhandled option '%c'", flag);
428 break; 655 break;
430 } 657 }
431 658
432 if (be_quiet && be_verbose) 659 if (be_quiet && be_verbose)
433 err("You can be quiet or you can be verbose, not both, stupid"); 660 err("You can be quiet or you can be verbose, not both, stupid");
434 661
662 /* let the format option override all other options */
663 if (out_format) {
664 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0;
665 for (flag=0; out_format[flag]; ++flag) {
666 if (out_format[flag] != '%') continue;
667
668 switch (out_format[++flag]) {
669 case '%': break;
670 case 'F': break;
671 case 's': break;
672 case 'x': show_pax = 1; break;
673 case 'e': show_stack = 1; break;
674 case 't': show_textrel = 1; break;
675 case 'r': show_rpath = 1; break;
676 case 'n': show_needed = 1; break;
677 case 'i': show_interp = 1; break;
678 default:
679 err("Invalid format specifier '%c' (byte %i)",
680 out_format[flag], flag+1);
681 }
682 }
683 }
684
685 /* now lets actually do the scanning */
435 if (scan_ldpath) scanelf_ldpath(); 686 if (scan_ldpath) scanelf_ldpath();
436 if (scan_envpath) scanelf_envpath(); 687 if (scan_envpath) scanelf_envpath();
437 if (optind == argc && !scan_ldpath && !scan_envpath) 688 if (optind == argc && !scan_ldpath && !scan_envpath)
438 err("Nothing to scan !?"); 689 err("Nothing to scan !?");
439 while (optind < argc) 690 while (optind < argc)
440 scanelf_dir(argv[optind++]); 691 scanelf_dir(argv[optind++]);
692
693 /* clean up */
694 if (find_sym) {
695 free(find_sym);
696 free(versioned_symname);
697 }
698 if (out_format) free(out_format);
441} 699}
442 700
443 701
444 702
445int main(int argc, char *argv[]) 703int main(int argc, char *argv[])

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