/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.23 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 1.23 2005/04/03 18:27:45 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 1.23 2005/04/03 18:27:45 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
71/* sub-funcs for scanelf_file() */
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)
84{
85 int i;
86 if (!show_stack) return;
87#define SHOW_STACK(B) \
88 if (elf->elf_class == ELFCLASS ## B) { \
89 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
90 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
91 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
92 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \
93 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \
94 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
95 continue; \
96 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \
97 *found_stack = 1; \
98 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \
99 *found_relro = 1; \
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; \
127 } \
128 } }
129 SHOW_TEXTREL(32)
130 SHOW_TEXTREL(64)
131 if (!be_quiet && !*found_textrel) printf("------- ");
132}
133static void scanelf_file_rpath(elfobj *elf, char *found_rpath)
134{
135 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
136 int i;
137 char *rpath, *runpath;
138 void *strtbl_void;
139
140 if (!show_rpath) return;
141
142 strtbl_void = elf_findsecbyname(elf, ".dynstr");
143 rpath = runpath = NULL;
144
145 if (strtbl_void) {
146#define SHOW_RPATH(B) \
147 if (elf->elf_class == ELFCLASS ## B) { \
148 Elf ## B ## _Dyn *dyn; \
149 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
150 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
151 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
152 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
153 if (EGET(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_RPATH) { \
157 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
158 *found_rpath = 1; \
159 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
160 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
161 *found_rpath = 1; \
162 } \
163 ++dyn; \
164 } \
165 } }
166 SHOW_RPATH(32)
167 SHOW_RPATH(64)
168 }
169 if (rpath && runpath) {
170 if (!strcmp(rpath, runpath))
171 printf("%-5s ", runpath);
172 else {
173 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", 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}
76/* scan an elf file and show all the fun stuff */ 287/* scan an elf file and show all the fun stuff */
77static void scanelf_file(const char *filename) 288static void scanelf_file(const char *filename)
78{ 289{
79 int i; 290 int i;
80 char found_pax, found_stack, found_relro, found_textrel, found_rpath; 291 char found_pax, found_stack, found_relro, found_textrel,
81 Elf_Dyn *dyn; 292 found_rpath, found_needed, found_interp, found_sym,
293 found_file;
82 elfobj *elf = NULL; 294 elfobj *elf;
295 struct stat st;
83 296
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
84 found_pax = found_stack = found_relro = found_textrel = found_rpath = 0; 308 found_pax = found_stack = found_relro = found_textrel = \
309 found_rpath = found_needed = found_interp = found_sym = \
310 found_file = 0;
85 311
86 /* verify this is real ELF */ 312 /* verify this is real ELF */
87 if ((elf = readelf(filename)) == NULL) { 313 if ((elf = readelf(filename)) == NULL) {
88 if (be_verbose > 1) printf("%s: not an ELF\n", filename); 314 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
89 return; 315 return;
90 } 316 }
91 317
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)
92 if (be_verbose) printf("%s: scanning file\n", filename); 323 printf("%s: scanning file\n", filename);
93 324
94 /* show the header */ 325 /* show the header */
95 if (!be_quiet && show_banner) { 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 }
342 }
343 } else {
96 printf(" TYPE "); 344 printf(" TYPE ");
97 if (show_pax) printf(" PAX "); 345 if (show_pax) printf(" PAX ");
98 if (show_stack) printf(" STK/REL "); 346 if (show_stack) printf("STK/REL ");
99 if (show_textrel) printf("TEXTREL "); 347 if (show_textrel) printf("TEXTREL ");
100 if (show_rpath) printf("RPATH "); 348 if (show_rpath) printf("RPATH ");
349 if (show_needed) printf("NEEDED ");
350 if (show_interp) printf("INTERP ");
351 if (find_sym) printf("SYM ");
352 }
353 if (!found_file) printf(" FILE");
101 printf(" FILE\n"); 354 printf("\n");
102 show_banner = 0; 355 show_banner = 0;
103 } 356 }
104 357
105 /* dump all the good stuff */ 358 /* dump all the good stuff */
106 if (!be_quiet) 359 if (!be_quiet && !out_format)
107 printf("%-7s ", get_elfetype(elf->ehdr->e_type)); 360 printf("%-7s ", get_elfetype(elf));
108 361
109 if (show_pax) { 362 if (out_format) {
110 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); 363 for (i=0; out_format[i]; ++i) {
111 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { 364 if (out_format[i] != '%') {
112 found_pax = 1; 365 printf("%c", out_format[i]);
113 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
114 }
115 }
116
117 /* stack fun */
118 if (show_stack) {
119 for (i = 0; i < elf->ehdr->e_phnum; i++) {
120 if (elf->phdr[i].p_type != PT_GNU_STACK && \
121 elf->phdr[i].p_type != PT_GNU_RELRO) continue;
122
123 if (be_quiet && !(elf->phdr[i].p_flags & PF_X))
124 continue; 366 continue;
125
126 if (elf->phdr[i].p_type == PT_GNU_STACK)
127 found_stack = 1;
128 if (elf->phdr[i].p_type == PT_GNU_RELRO)
129 found_relro = 1;
130
131 printf("%s ", gnu_short_stack_flags(elf->phdr[i].p_flags));
132 }
133 if (!be_quiet && !found_stack) printf("--- ");
134 if (!be_quiet && !found_relro) printf("--- ");
135 }
136
137 /* textrel fun */
138 if (show_textrel) {
139 for (i = 0; i < elf->ehdr->e_phnum; i++) {
140 if (elf->phdr[i].p_type != PT_DYNAMIC) continue;
141
142 dyn = (Elf_Dyn *)(elf->data + elf->phdr[i].p_offset);
143 while (dyn->d_tag != DT_NULL) {
144 if (dyn->d_tag == DT_TEXTREL) { //dyn->d_tag != DT_FLAGS)
145 found_textrel = 1;
146// if (dyn->d_un.d_val & DF_TEXTREL)
147 printf("TEXTREL ");
148 }
149 ++dyn;
150 } 367 }
151 }
152 if (!be_quiet && !found_textrel) printf("------- ");
153 }
154 368
155 /* rpath fun */ 369 switch (out_format[++i]) {
156 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 370 case '%': printf("%%"); break;
157 if (show_rpath) { 371 case 'F': found_file = 1; printf("%s ", filename); break;
158 char *rpath, *runpath; 372 case 'x': scanelf_file_pax(elf, &found_pax); break;
159 Elf_Shdr *strtbl = elf_findsecbyname(elf, ".dynstr"); 373 case 'e': scanelf_file_stack(elf, &found_stack, &found_relro); break;
160 rpath = runpath = NULL; 374 case 't': scanelf_file_textrel(elf, &found_textrel); break;
161 375 case 'r': scanelf_file_rpath(elf, &found_rpath); break;
162 if (strtbl) 376 case 'n': scanelf_file_needed(elf, &found_needed); break;
163 for (i = 0; i < elf->ehdr->e_phnum; i++) { 377 case 'i': scanelf_file_interp(elf, &found_interp); break;
164 if (elf->phdr[i].p_type != PT_DYNAMIC) continue; 378 case 's': scanelf_file_sym(elf, &found_sym, filename); break;
165
166 dyn = (Elf_Dyn *)(elf->data + elf->phdr[i].p_offset);
167 while (dyn->d_tag != DT_NULL) {
168 if (dyn->d_tag == DT_RPATH) { //|| dyn->d_tag != DT_RUNPATH)
169 rpath = elf->data + strtbl->sh_offset + dyn->d_un.d_ptr;
170 found_rpath = 1;
171 } else if (dyn->d_tag == DT_RUNPATH) {
172 runpath = elf->data + strtbl->sh_offset + dyn->d_un.d_ptr;
173 found_rpath = 1;
174 }
175 ++dyn;
176 } 379 }
177 } 380 }
178 if (rpath && runpath) {
179 if (!strcmp(rpath, runpath))
180 printf("%-5s ", runpath);
181 else { 381 } else {
182 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 382 scanelf_file_pax(elf, &found_pax);
183 printf("{%s,%s} ", rpath, runpath); 383 scanelf_file_stack(elf, &found_stack, &found_relro);
184 } 384 scanelf_file_textrel(elf, &found_textrel);
185 } else if (rpath || runpath) 385 scanelf_file_rpath(elf, &found_rpath);
186 printf("%-5s ", (runpath ? runpath : rpath)); 386 scanelf_file_needed(elf, &found_needed);
187 else if (!be_quiet && !found_rpath) 387 scanelf_file_interp(elf, &found_interp);
188 printf(" - "); 388 scanelf_file_sym(elf, &found_sym, filename);
189 } 389 }
190 390
391 if (!found_file) {
191 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)
192 puts(filename); 394 puts(filename);
395 } else {
396 printf("\n");
397 }
193 398
194 unreadelf(elf); 399 unreadelf(elf);
195} 400}
196 401
197/* 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 */
199{ 404{
200 register DIR *dir; 405 register DIR *dir;
201 register struct dirent *dentry; 406 register struct dirent *dentry;
202 struct stat st_top, st; 407 struct stat st_top, st;
203 char buf[_POSIX_PATH_MAX]; 408 char buf[_POSIX_PATH_MAX];
204 size_t len = 0; 409 size_t pathlen = 0, len = 0;
205 410
206 /* make sure path exists */ 411 /* make sure path exists */
207 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);
208 return; 414 return;
415 }
209 416
210 /* 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 */
211 if (!S_ISDIR(st_top.st_mode)) { 418 if (!S_ISDIR(st_top.st_mode)) {
212 scanelf_file(path); 419 scanelf_file(path);
213 return; 420 return;
218 warnf("could not opendir %s: %s", path, strerror(errno)); 425 warnf("could not opendir %s: %s", path, strerror(errno));
219 return; 426 return;
220 } 427 }
221 if (be_verbose) printf("%s: scanning dir\n", path); 428 if (be_verbose) printf("%s: scanning dir\n", path);
222 429
430 pathlen = strlen(path);
223 while ((dentry = readdir(dir))) { 431 while ((dentry = readdir(dir))) {
224 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 432 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
225 continue; 433 continue;
226 len = (strlen(path) + 2 + strlen(dentry->d_name)); 434 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
227 assert(len < sizeof(buf)); 435 if (len >= sizeof(buf)) {
228 strncpy(buf, path, len); 436 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
229 strncat(buf, "/", len); 437 continue;
230 strncat(buf, dentry->d_name, len); 438 }
231 buf[sizeof(buf)] = 0; 439 sprintf(buf, "%s/%s", path, dentry->d_name);
232 if (lstat(buf, &st) != -1) { 440 if (lstat(buf, &st) != -1) {
233 if (S_ISREG(st.st_mode)) 441 if (S_ISREG(st.st_mode))
234 scanelf_file(buf); 442 scanelf_file(buf);
235 else if (dir_recurse && S_ISDIR(st.st_mode)) { 443 else if (dir_recurse && S_ISDIR(st.st_mode)) {
236 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 444 if (dir_crossmount || (st_top.st_dev == st.st_dev))
251 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 459 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
252 err("Unable to open ld.so.conf: %s", strerror(errno)); 460 err("Unable to open ld.so.conf: %s", strerror(errno));
253 461
254 scan_l = scan_ul = scan_ull = 0; 462 scan_l = scan_ul = scan_ull = 0;
255 463
256 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 }
257 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 468 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
258 if (*path == '/') { 469 if (*path == '/') {
259 if ((p = strrchr(path, '\r')) != NULL) 470 if ((p = strrchr(path, '\r')) != NULL)
260 *p = 0; 471 *p = 0;
261 if ((p = strrchr(path, '\n')) != NULL) 472 if ((p = strrchr(path, '\n')) != NULL)
264 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 475 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1;
265 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 476 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
266 scanelf_dir(path); 477 scanelf_dir(path);
267 } 478 }
268 free(path); 479 free(path);
480 fclose(fp);
269 481
270 if (!scan_l) scanelf_dir("/lib"); 482 if (!scan_l) scanelf_dir("/lib");
271 if (!scan_ul) scanelf_dir("/usr/lib"); 483 if (!scan_ul) scanelf_dir("/usr/lib");
272 if (!scan_ull) scanelf_dir("/usr/local/lib"); 484 if (!scan_ull) scanelf_dir("/usr/local/lib");
273
274 fclose(fp);
275} 485}
276 486
277/* scan env PATH for paths */ 487/* scan env PATH for paths */
278static void scanelf_envpath() 488static void scanelf_envpath()
279{ 489{
282 path = getenv("PATH"); 492 path = getenv("PATH");
283 if (!path) 493 if (!path)
284 err("PATH is not set in your env !"); 494 err("PATH is not set in your env !");
285 495
286 if ((path = strdup(path)) == NULL) 496 if ((path = strdup(path)) == NULL)
287 err("stdup failed: %s", strerror(errno)); 497 err("strdup failed: %s", strerror(errno));
288 498
289 while ((p = strrchr(path, ':')) != NULL) { 499 while ((p = strrchr(path, ':')) != NULL) {
290 scanelf_dir(p + 1); 500 scanelf_dir(p + 1);
291 *p = 0; 501 *p = 0;
292 } 502 }
295} 505}
296 506
297 507
298 508
299/* usage / invocation handling functions */ 509/* usage / invocation handling functions */
300#define PARSE_FLAGS "plRmxetro:aqvBhV" 510#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV"
511#define a_argument required_argument
301static struct option const long_opts[] = { 512static struct option const long_opts[] = {
302 {"path", no_argument, NULL, 'p'}, 513 {"path", no_argument, NULL, 'p'},
303 {"ldpath", no_argument, NULL, 'l'}, 514 {"ldpath", no_argument, NULL, 'l'},
304 {"recursive", no_argument, NULL, 'R'}, 515 {"recursive", no_argument, NULL, 'R'},
305 {"mount", no_argument, NULL, 'm'}, 516 {"mount", no_argument, NULL, 'm'},
517 {"symlink", no_argument, NULL, 'y'},
306 {"pax", no_argument, NULL, 'x'}, 518 {"pax", no_argument, NULL, 'x'},
307 {"header", no_argument, NULL, 'e'}, 519 {"header", no_argument, NULL, 'e'},
308 {"textrel", no_argument, NULL, 't'}, 520 {"textrel", no_argument, NULL, 't'},
309 {"rpath", no_argument, NULL, 'r'}, 521 {"rpath", no_argument, NULL, 'r'},
310 {"file",required_argument, NULL, 'o'}, 522 {"needed", no_argument, NULL, 'n'},
523 {"interp", no_argument, NULL, 'i'},
524 {"symbol", a_argument, NULL, 's'},
311 {"all", no_argument, NULL, 'a'}, 525 {"all", no_argument, NULL, 'a'},
312 {"quiet", no_argument, NULL, 'q'}, 526 {"quiet", no_argument, NULL, 'q'},
313 {"verbose", no_argument, NULL, 'v'}, 527 {"verbose", no_argument, NULL, 'v'},
528 {"format", a_argument, NULL, 'F'},
529 {"file", a_argument, NULL, 'o'},
314 {"nobanner", no_argument, NULL, 'B'}, 530 {"nobanner", no_argument, NULL, 'B'},
315 {"help", no_argument, NULL, 'h'}, 531 {"help", no_argument, NULL, 'h'},
316 {"version", no_argument, NULL, 'V'}, 532 {"version", no_argument, NULL, 'V'},
317 {NULL, no_argument, NULL, 0x0} 533 {NULL, no_argument, NULL, 0x0}
318}; 534};
319static char *opts_help[] = { 535static char *opts_help[] = {
320 "Scan all directories in PATH environment", 536 "Scan all directories in PATH environment",
321 "Scan all directories in /etc/ld.so.conf", 537 "Scan all directories in /etc/ld.so.conf",
322 "Scan directories recursively", 538 "Scan directories recursively",
323 "Don't recursively cross mount points\n", 539 "Don't recursively cross mount points",
540 "Don't scan symlinks\n",
324 "Print PaX markings", 541 "Print PaX markings",
325 "Print GNU_STACK markings", 542 "Print GNU_STACK markings",
326 "Print TEXTREL information", 543 "Print TEXTREL information",
327 "Print RPATH information", 544 "Print RPATH information",
328 "Write output stream to a filename", 545 "Print NEEDED information",
546 "Print INTERP information",
547 "Find a specified symbol",
329 "Print all scanned info (-x -e -t -r)\n", 548 "Print all scanned info (-x -e -t -r)\n",
330 "Only output 'bad' things", 549 "Only output 'bad' things",
331 "Be verbose (can be specified more than once)", 550 "Be verbose (can be specified more than once)",
551 "Use specified format for output",
552 "Write output stream to a filename",
332 "Don't display the header", 553 "Don't display the header",
333 "Print this help and exit", 554 "Print this help and exit",
334 "Print version and exit", 555 "Print version and exit",
335 NULL 556 NULL
336}; 557};
338/* display usage and exit */ 559/* display usage and exit */
339static void usage(int status) 560static void usage(int status)
340{ 561{
341 int i; 562 int i;
342 printf(" Scan ELF binaries for stuff\n\n" 563 printf(" Scan ELF binaries for stuff\n\n"
343 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 564 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
344 printf("Options:\n"); 565 printf("Options: -[%s]\n", PARSE_FLAGS);
345 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)
346 printf(" -%c, --%-12s %s\n", long_opts[i].val, 568 printf(" -%c, --%-13s %s\n", long_opts[i].val,
347 long_opts[i].name, opts_help[i]); 569 long_opts[i].name, opts_help[i]);
348#ifdef MANLYPAGE 570 else
349 for (i = 0; long_opts[i].name; ++i) 571 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val,
350 printf(".TP\n\\fB\\-%c, \\-\\-%s\\fR\n%s\n", long_opts[i].val,
351 long_opts[i].name, opts_help[i]); 572 long_opts[i].name, opts_help[i]);
352#endif
353 exit(status); 573 exit(status);
354} 574}
355 575
356/* parse command line arguments and preform needed actions */ 576/* parse command line arguments and preform needed actions */
357static void parseargs(int argc, char *argv[]) 577static void parseargs(int argc, char *argv[])
360 580
361 opterr = 0; 581 opterr = 0;
362 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) {
363 switch (flag) { 583 switch (flag) {
364 584
365 case 'V': /* version info */ 585 case 'V':
366 printf("%s compiled %s\n%s\n" 586 printf("%s compiled %s\n%s\n"
367 "%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",
368 __FILE__, __DATE__, rcsid, argv0); 588 __FILE__, __DATE__, rcsid, argv0);
369 exit(EXIT_SUCCESS); 589 exit(EXIT_SUCCESS);
370 break; 590 break;
371 case 's': /* reserved for -s, --symbol= */
372 case 'h': usage(EXIT_SUCCESS); break; 591 case 'h': usage(EXIT_SUCCESS); break;
373 592
374 case 'o': 593 case 'o': {
375 {
376 FILE *fp = NULL; 594 FILE *fp = NULL;
377 fp = freopen(optarg, "w", stdout); 595 fp = freopen(optarg, "w", stdout);
378 if (fp == NULL) { 596 if (fp == NULL)
379 fputs("open ", stderr); 597 err("Could not open output stream '%s': %s", optarg, strerror(errno));
380 perror(optarg);
381 } else
382 stdout = fp; 598 stdout = fp;
383 break; 599 break;
384 } 600 }
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;
385 case 'B': show_banner = 0; break; 630 case 'B': show_banner = 0; break;
386 case 'l': scan_ldpath = 1; break; 631 case 'l': scan_ldpath = 1; break;
387 case 'p': scan_envpath = 1; break; 632 case 'p': scan_envpath = 1; break;
388 case 'R': dir_recurse = 1; break; 633 case 'R': dir_recurse = 1; break;
389 case 'm': dir_crossmount = 0; break; 634 case 'm': dir_crossmount = 0; break;
390 case 'x': show_pax = 1; break; 635 case 'x': show_pax = 1; break;
391 case 'e': show_stack = 1; break; 636 case 'e': show_stack = 1; break;
392 case 't': show_textrel = 1; break; 637 case 't': show_textrel = 1; break;
393 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;
394 case 'q': be_quiet = 1; break; 641 case 'q': be_quiet = 1; break;
395 case 'v': be_verbose = (be_verbose % 20) + 1; break; 642 case 'v': be_verbose = (be_verbose % 20) + 1; break;
396 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;
397 644
398 case ':': 645 case ':':
399 warn("Option missing parameter"); 646 warn("Option missing parameter\n");
400 usage(EXIT_FAILURE); 647 usage(EXIT_FAILURE);
401 break; 648 break;
402 case '?': 649 case '?':
403 warn("Unknown option"); 650 warn("Unknown option\n");
404 usage(EXIT_FAILURE); 651 usage(EXIT_FAILURE);
405 break; 652 break;
406 default: 653 default:
407 err("Unhandled option '%c'", flag); 654 err("Unhandled option '%c'", flag);
408 break; 655 break;
410 } 657 }
411 658
412 if (be_quiet && be_verbose) 659 if (be_quiet && be_verbose)
413 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");
414 661
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 */
415 if (scan_ldpath) scanelf_ldpath(); 686 if (scan_ldpath) scanelf_ldpath();
416 if (scan_envpath) scanelf_envpath(); 687 if (scan_envpath) scanelf_envpath();
688 if (optind == argc && !scan_ldpath && !scan_envpath)
689 err("Nothing to scan !?");
417 while (optind < argc) 690 while (optind < argc)
418 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);
419} 699}
420 700
421 701
422 702
423int main(int argc, char *argv[]) 703int main(int argc, char *argv[])

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