/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.22 Revision 1.43
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 1.22 2005/04/03 18:03:22 vapier Exp $ 5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.43 2005/05/06 02:55:27 vapier 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 1.22 2005/04/03 18:03:22 vapier Exp $"; 38static const char *rcsid = "$Id: scanelf.c,v 1.43 2005/05/06 02:55:27 vapier 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);
55static void scanelf_dir(const char *path); 45static void scanelf_dir(const char *path);
56static void scanelf_ldpath(); 46static void scanelf_ldpath();
57static void scanelf_envpath(); 47static void scanelf_envpath();
58static void usage(int status); 48static void usage(int status);
59static void parseargs(int argc, char *argv[]); 49static void parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s);
51static void *xmalloc(size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len);
53static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54static int xemptybuffer(const char *buff);
60 55
61/* variables to control behavior */ 56/* variables to control behavior */
62static char scan_ldpath = 0; 57static char scan_ldpath = 0;
63static char scan_envpath = 0; 58static char scan_envpath = 0;
59static char scan_symlink = 1;
64static char dir_recurse = 0; 60static char dir_recurse = 0;
65static char dir_crossmount = 1; 61static char dir_crossmount = 1;
66static char show_pax = 0; 62static char show_pax = 0;
67static char show_stack = 0; 63static char show_stack = 0;
68static char show_textrel = 0; 64static char show_textrel = 0;
69static char show_rpath = 0; 65static char show_rpath = 0;
66static char show_needed = 0;
67static char show_interp = 0;
70static char show_banner = 1; 68static char show_banner = 1;
71static char be_quiet = 0; 69static char be_quiet = 0;
72static char be_verbose = 0; 70static char be_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL;
72static char *out_format = NULL;
73 73
74 74
75 75
76/* sub-funcs for scanelf_file() */
77static char *scanelf_file_pax(elfobj *elf, char *found_pax)
78{
79 static char *paxflags;
80
81 if (!show_pax) return NULL;
82
83 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
84 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
85 *found_pax = 1;
86 return paxflags;
87 }
88
89 return NULL;
90}
91static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
92{
93 static char ret[8];
94 char *found;
95 int i, off, shown;
96
97 if (!show_stack) return NULL;
98
99 shown = 0;
100 strcpy(ret, "--- ---");
101#define SHOW_STACK(B) \
102 if (elf->elf_class == ELFCLASS ## B) { \
103 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
104 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
105 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
106 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
107 found = found_stack; \
108 off = 0; \
109 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
110 found = found_relro; \
111 off = 3; \
112 } else \
113 continue; \
114 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
115 continue; \
116 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
117 *found = 1; \
118 ++shown; \
119 } \
120 }
121 SHOW_STACK(32)
122 SHOW_STACK(64)
123 if (be_quiet && !shown)
124 return NULL;
125 else
126 return ret;
127}
128static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
129{
130 static char *ret = "TEXTREL";
131 int i;
132
133 if (!show_textrel) return NULL;
134
135#define SHOW_TEXTREL(B) \
136 if (elf->elf_class == ELFCLASS ## B) { \
137 Elf ## B ## _Dyn *dyn; \
138 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
139 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
140 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
141 if (phdr[i].p_type != PT_DYNAMIC) continue; \
142 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
143 while (EGET(dyn->d_tag) != DT_NULL) { \
144 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
145 *found_textrel = 1; \
146 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
147 return ret; \
148 } \
149 ++dyn; \
150 } \
151 } }
152 SHOW_TEXTREL(32)
153 SHOW_TEXTREL(64)
154 if (be_quiet)
155 return NULL;
156 else
157 return " - ";
158}
159static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
160{
161 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
162 int i;
163 char *rpath, *runpath;
164 void *strtbl_void;
165
166 if (!show_rpath) return;
167
168 strtbl_void = elf_findsecbyname(elf, ".dynstr");
169 rpath = runpath = NULL;
170
171 if (strtbl_void) {
172#define SHOW_RPATH(B) \
173 if (elf->elf_class == ELFCLASS ## B) { \
174 Elf ## B ## _Dyn *dyn; \
175 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
176 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
177 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
178 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
179 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
180 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
181 while (EGET(dyn->d_tag) != DT_NULL) { \
182 if (EGET(dyn->d_tag) == DT_RPATH) { \
183 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \
184 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
185 *found_rpath = 1; \
186 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
187 if (runpath) warn("ELF has multiple DT_RUNPATH's !?"); \
188 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
189 *found_rpath = 1; \
190 } \
191 ++dyn; \
192 } \
193 } }
194 SHOW_RPATH(32)
195 SHOW_RPATH(64)
196 }
197
198 if (rpath && runpath) {
199 if (!strcmp(rpath, runpath)) {
200 xstrcat(ret, runpath, ret_len);
201 } else {
202 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
203 xchrcat(ret, '{', ret_len);
204 xstrcat(ret, rpath, ret_len);
205 xchrcat(ret, ',', ret_len);
206 xstrcat(ret, runpath, ret_len);
207 xchrcat(ret, '}', ret_len);
208 }
209 } else if (rpath || runpath)
210 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
211 else if (!be_quiet)
212 xstrcat(ret, " - ", ret_len);
213}
214static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
215{
216 int i;
217 char *needed;
218 void *strtbl_void;
219
220 if (!show_needed) return;
221
222 strtbl_void = elf_findsecbyname(elf, ".dynstr");
223
224 if (strtbl_void) {
225#define SHOW_NEEDED(B) \
226 if (elf->elf_class == ELFCLASS ## B) { \
227 Elf ## B ## _Dyn *dyn; \
228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
229 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
231 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
232 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
233 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
234 while (EGET(dyn->d_tag) != DT_NULL) { \
235 if (EGET(dyn->d_tag) == DT_NEEDED) { \
236 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
237 if (*found_needed) xchrcat(ret, ',', ret_len); \
238 xstrcat(ret, needed, ret_len); \
239 *found_needed = 1; \
240 } \
241 ++dyn; \
242 } \
243 } }
244 SHOW_NEEDED(32)
245 SHOW_NEEDED(64)
246 }
247}
248static char *scanelf_file_interp(elfobj *elf, char *found_interp)
249{
250 void *strtbl_void;
251
252 if (!show_interp) return NULL;
253
254 strtbl_void = elf_findsecbyname(elf, ".interp");
255
256 if (strtbl_void) {
257#define SHOW_INTERP(B) \
258 if (elf->elf_class == ELFCLASS ## B) { \
259 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
260 *found_interp = 1; \
261 return elf->data + EGET(strtbl->sh_offset); \
262 }
263 SHOW_INTERP(32)
264 SHOW_INTERP(64)
265 }
266 return NULL;
267}
268static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
269{
270 int i;
271 void *symtab_void, *strtab_void;
272
273 if (!find_sym) return NULL;
274
275 symtab_void = elf_findsecbyname(elf, ".symtab");
276 strtab_void = elf_findsecbyname(elf, ".strtab");
277
278 if (symtab_void && strtab_void) {
279#define FIND_SYM(B) \
280 if (elf->elf_class == ELFCLASS ## B) { \
281 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
282 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
283 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
284 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
285 char *symname; \
286 for (i = 0; i < cnt; ++i) { \
287 if (sym->st_name) { \
288 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
289 if (*find_sym == '*') { \
290 printf("%s(%s) %5lX %15s %s\n", \
291 ((*found_sym == 0) ? "\n\t" : "\t"), \
292 (char *)basename(filename), \
293 (long)sym->st_size, \
294 (char *)get_elfstttype(sym->st_info), \
295 symname); \
296 *found_sym = 1; \
297 } else if ((strcmp(find_sym, symname) == 0) || \
298 (strcmp(symname, versioned_symname) == 0)) \
299 (*found_sym)++; \
300 } \
301 ++sym; \
302 } }
303 FIND_SYM(32)
304 FIND_SYM(64)
305 }
306 if (*find_sym != '*' && *found_sym)
307 return find_sym;
308 if (be_quiet)
309 return NULL;
310 else
311 return " - ";
312}
76/* scan an elf file and show all the fun stuff */ 313/* scan an elf file and show all the fun stuff */
314#define prints(str) fputs(str, stdout)
77static void scanelf_file(const char *filename) 315static void scanelf_file(const char *filename)
78{ 316{
79 int i; 317 int i;
80 char found_pax, found_stack, found_relro, found_textrel, found_rpath; 318 char found_pax, found_stack, found_relro, found_textrel,
81 Elf_Dyn *dyn; 319 found_rpath, found_needed, found_interp, found_sym,
320 found_file;
82 elfobj *elf = NULL; 321 elfobj *elf;
322 struct stat st;
323 static char *out_buffer = NULL;
324 static size_t out_len;
83 325
326 /* make sure 'filename' exists */
327 if (lstat(filename, &st) == -1) {
328 if (be_verbose > 2) printf("%s: does not exist\n", filename);
329 return;
330 }
331 /* always handle regular files and handle symlinked files if no -y */
332 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
333 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
334 return;
335 }
336
84 found_pax = found_stack = found_relro = found_textrel = found_rpath = 0; 337 found_pax = found_stack = found_relro = found_textrel = \
338 found_rpath = found_needed = found_interp = found_sym = \
339 found_file = 0;
85 340
86 /* verify this is real ELF */ 341 /* verify this is real ELF */
87 if ((elf = readelf(filename)) == NULL) { 342 if ((elf = readelf(filename)) == NULL) {
88 if (be_verbose > 1) printf("%s: not an ELF\n", filename); 343 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
89 return; 344 return;
90 } 345 }
91 346
347 if (be_verbose > 1)
348 printf("%s: scanning file {%s,%s}\n", filename,
349 get_elfeitype(elf, EI_CLASS, elf->elf_class),
350 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
351 else if (be_verbose)
92 if (be_verbose) printf("%s: scanning file\n", filename); 352 printf("%s: scanning file\n", filename);
353
354 /* init output buffer */
355 if (!out_buffer) {
356 out_len = sizeof(char) * 80;
357 out_buffer = (char*)xmalloc(out_len);
358 }
359 *out_buffer = '\0';
93 360
94 /* show the header */ 361 /* show the header */
95 if (!be_quiet && show_banner) { 362 if (!be_quiet && show_banner) {
96 fputs(" TYPE ", stdout); 363 for (i=0; out_format[i]; ++i) {
97 if (show_pax) fputs(" PAX ", stdout); 364 if (out_format[i] != '%') continue;
98 if (show_stack) fputs(" STK/REL ", stdout); 365
99 if (show_textrel) fputs("TEXTREL ", stdout); 366 switch (out_format[++i]) {
100 if (show_rpath) fputs("RPATH ", stdout); 367 case '%': break;
101 fputs(" FILE\n", stdout); 368 case 'F': prints("FILE "); break;
369 case 'o': prints(" TYPE "); break;
370 case 'x': prints(" PAX "); break;
371 case 'e': prints("STK/REL "); break;
372 case 't': prints("TEXTREL "); break;
373 case 'r': prints("RPATH "); break;
374 case 'n': prints("NEEDED "); break;
375 case 'i': prints("INTERP "); break;
376 case 's': prints("SYM "); break;
377 }
378 }
379 prints("\n");
102 show_banner = 0; 380 show_banner = 0;
103 } 381 }
104 382
105 /* dump all the good stuff */ 383 /* dump all the good stuff */
106 if (!be_quiet) 384 for (i=0; out_format[i]; ++i) {
107 printf("%-7s ", get_elfetype(elf->ehdr->e_type)); 385 const char *out;
108 386
109 if (show_pax) { 387 /* make sure we trim leading spaces in quiet mode */
110 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); 388 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
111 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { 389 *out_buffer = '\0';
112 found_pax = 1;
113 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
114 }
115 }
116 390
117 /* stack fun */ 391 if (out_format[i] != '%') {
118 if (show_stack) { 392 xchrcat(&out_buffer, out_format[i], &out_len);
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; 393 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) fputs("--- ", stdout);
134 if (!be_quiet && !found_relro) fputs("--- ", stdout);
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 fputs("TEXTREL ", stdout);
148 }
149 ++dyn;
150 } 394 }
151 }
152 if (!be_quiet && !found_textrel) fputs("------- ", stdout);
153 }
154 395
155 /* rpath fun */ 396 out = NULL;
156 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 397 switch (out_format[++i]) {
157 if (show_rpath) { 398 case '%': xchrcat(&out_buffer, '%', &out_len); break;
158 Elf_Shdr *strtbl = elf_findsecbyname(elf, ".dynstr"); 399 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
159 400 case 'o': out = get_elfetype(elf); break;
160 if (strtbl) 401 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
161 for (i = 0; i < elf->ehdr->e_phnum; i++) { 402 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
162 if (elf->phdr[i].p_type != PT_DYNAMIC) continue; 403 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
163 404 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
164 dyn = (Elf_Dyn *)(elf->data + elf->phdr[i].p_offset); 405 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
165 while (dyn->d_tag != DT_NULL) { 406 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
166 if (dyn->d_tag == DT_RPATH) { //|| dyn->d_tag != DT_RUNPATH) 407 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
167 char *rpath = elf->data + strtbl->sh_offset + dyn->d_un.d_ptr;
168 found_rpath = 1;
169 printf("%s ", rpath);
170 }
171 ++dyn;
172 } 408 }
409 if (out) xstrcat(&out_buffer, out, &out_len);
173 } 410 }
174 if (!be_quiet && !found_rpath) fputs(" - ", stdout);
175 }
176 411
412 if (!found_file) {
177 if (!be_quiet || found_pax || found_stack || found_textrel || found_rpath) 413 if (!be_quiet || found_pax || found_stack || found_textrel || \
178 puts(filename); 414 found_rpath || found_needed || found_interp || found_sym)
415 xstrcat(&out_buffer, filename, &out_len);
416 }
417 if (!(be_quiet && xemptybuffer(out_buffer)))
418 puts(out_buffer);
179 419
180 unreadelf(elf); 420 unreadelf(elf);
181} 421}
182 422
183/* scan a directory for ET_EXEC files and print when we find one */ 423/* scan a directory for ET_EXEC files and print when we find one */
185{ 425{
186 register DIR *dir; 426 register DIR *dir;
187 register struct dirent *dentry; 427 register struct dirent *dentry;
188 struct stat st_top, st; 428 struct stat st_top, st;
189 char buf[_POSIX_PATH_MAX]; 429 char buf[_POSIX_PATH_MAX];
190 size_t len = 0; 430 size_t pathlen = 0, len = 0;
191 431
192 /* make sure path exists */ 432 /* make sure path exists */
193 if (lstat(path, &st_top) == -1) 433 if (lstat(path, &st_top) == -1) {
434 if (be_verbose > 2) printf("%s: does not exist\n", path);
194 return; 435 return;
436 }
195 437
196 /* ok, if it isn't a directory, assume we can open it */ 438 /* ok, if it isn't a directory, assume we can open it */
197 if (!S_ISDIR(st_top.st_mode)) { 439 if (!S_ISDIR(st_top.st_mode)) {
198 scanelf_file(path); 440 scanelf_file(path);
199 return; 441 return;
204 warnf("could not opendir %s: %s", path, strerror(errno)); 446 warnf("could not opendir %s: %s", path, strerror(errno));
205 return; 447 return;
206 } 448 }
207 if (be_verbose) printf("%s: scanning dir\n", path); 449 if (be_verbose) printf("%s: scanning dir\n", path);
208 450
451 pathlen = strlen(path);
209 while ((dentry = readdir(dir))) { 452 while ((dentry = readdir(dir))) {
210 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 453 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
211 continue; 454 continue;
212 len = (strlen(path) + 2 + strlen(dentry->d_name)); 455 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
213 assert(len < sizeof(buf)); 456 if (len >= sizeof(buf)) {
214 strncpy(buf, path, len); 457 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
215 strncat(buf, "/", len); 458 continue;
216 strncat(buf, dentry->d_name, len); 459 }
217 buf[sizeof(buf)] = 0; 460 sprintf(buf, "%s/%s", path, dentry->d_name);
218 if (lstat(buf, &st) != -1) { 461 if (lstat(buf, &st) != -1) {
219 if (S_ISREG(st.st_mode)) 462 if (S_ISREG(st.st_mode))
220 scanelf_file(buf); 463 scanelf_file(buf);
221 else if (dir_recurse && S_ISDIR(st.st_mode)) { 464 else if (dir_recurse && S_ISDIR(st.st_mode)) {
222 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 465 if (dir_crossmount || (st_top.st_dev == st.st_dev))
237 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 480 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
238 err("Unable to open ld.so.conf: %s", strerror(errno)); 481 err("Unable to open ld.so.conf: %s", strerror(errno));
239 482
240 scan_l = scan_ul = scan_ull = 0; 483 scan_l = scan_ul = scan_ull = 0;
241 484
242 path = malloc(_POSIX_PATH_MAX); 485 path = (char*)xmalloc(_POSIX_PATH_MAX);
243 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 486 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
244 if (*path == '/') { 487 if (*path == '/') {
245 if ((p = strrchr(path, '\r')) != NULL) 488 if ((p = strrchr(path, '\r')) != NULL)
246 *p = 0; 489 *p = 0;
247 if ((p = strrchr(path, '\n')) != NULL) 490 if ((p = strrchr(path, '\n')) != NULL)
250 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 493 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1;
251 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 494 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
252 scanelf_dir(path); 495 scanelf_dir(path);
253 } 496 }
254 free(path); 497 free(path);
498 fclose(fp);
255 499
256 if (!scan_l) scanelf_dir("/lib"); 500 if (!scan_l) scanelf_dir("/lib");
257 if (!scan_ul) scanelf_dir("/usr/lib"); 501 if (!scan_ul) scanelf_dir("/usr/lib");
258 if (!scan_ull) scanelf_dir("/usr/local/lib"); 502 if (!scan_ull) scanelf_dir("/usr/local/lib");
259
260 fclose(fp);
261} 503}
262 504
263/* scan env PATH for paths */ 505/* scan env PATH for paths */
264static void scanelf_envpath() 506static void scanelf_envpath()
265{ 507{
266 char *path, *p; 508 char *path, *p;
267 509
268 path = getenv("PATH"); 510 path = getenv("PATH");
269 if (!path) 511 if (!path)
270 err("PATH is not set in your env !"); 512 err("PATH is not set in your env !");
271 513 path = xstrdup(path);
272 if ((path = strdup(path)) == NULL)
273 err("stdup failed: %s", strerror(errno));
274 514
275 while ((p = strrchr(path, ':')) != NULL) { 515 while ((p = strrchr(path, ':')) != NULL) {
276 scanelf_dir(p + 1); 516 scanelf_dir(p + 1);
277 *p = 0; 517 *p = 0;
278 } 518 }
281} 521}
282 522
283 523
284 524
285/* usage / invocation handling functions */ 525/* usage / invocation handling functions */
286#define PARSE_FLAGS "plRmxetro:aqvBhV" 526#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV"
527#define a_argument required_argument
287static struct option const long_opts[] = { 528static struct option const long_opts[] = {
288 {"path", no_argument, NULL, 'p'}, 529 {"path", no_argument, NULL, 'p'},
289 {"ldpath", no_argument, NULL, 'l'}, 530 {"ldpath", no_argument, NULL, 'l'},
290 {"recursive", no_argument, NULL, 'R'}, 531 {"recursive", no_argument, NULL, 'R'},
291 {"mount", no_argument, NULL, 'm'}, 532 {"mount", no_argument, NULL, 'm'},
533 {"symlink", no_argument, NULL, 'y'},
292 {"pax", no_argument, NULL, 'x'}, 534 {"pax", no_argument, NULL, 'x'},
293 {"header", no_argument, NULL, 'e'}, 535 {"header", no_argument, NULL, 'e'},
294 {"textrel", no_argument, NULL, 't'}, 536 {"textrel", no_argument, NULL, 't'},
295 {"rpath", no_argument, NULL, 'r'}, 537 {"rpath", no_argument, NULL, 'r'},
296 {"file",required_argument, NULL, 'o'}, 538 {"needed", no_argument, NULL, 'n'},
539 {"interp", no_argument, NULL, 'i'},
540 {"symbol", a_argument, NULL, 's'},
297 {"all", no_argument, NULL, 'a'}, 541 {"all", no_argument, NULL, 'a'},
298 {"quiet", no_argument, NULL, 'q'}, 542 {"quiet", no_argument, NULL, 'q'},
299 {"verbose", no_argument, NULL, 'v'}, 543 {"verbose", no_argument, NULL, 'v'},
544 {"format", a_argument, NULL, 'F'},
545 {"file", a_argument, NULL, 'o'},
300 {"nobanner", no_argument, NULL, 'B'}, 546 {"nobanner", no_argument, NULL, 'B'},
301 {"help", no_argument, NULL, 'h'}, 547 {"help", no_argument, NULL, 'h'},
302 {"version", no_argument, NULL, 'V'}, 548 {"version", no_argument, NULL, 'V'},
303 {NULL, no_argument, NULL, 0x0} 549 {NULL, no_argument, NULL, 0x0}
304}; 550};
305static char *opts_help[] = { 551static char *opts_help[] = {
306 "Scan all directories in PATH environment", 552 "Scan all directories in PATH environment",
307 "Scan all directories in /etc/ld.so.conf", 553 "Scan all directories in /etc/ld.so.conf",
308 "Scan directories recursively", 554 "Scan directories recursively",
309 "Don't recursively cross mount points\n", 555 "Don't recursively cross mount points",
556 "Don't scan symlinks\n",
310 "Print PaX markings", 557 "Print PaX markings",
311 "Print GNU_STACK markings", 558 "Print GNU_STACK markings",
312 "Print TEXTREL information", 559 "Print TEXTREL information",
313 "Print RPATH information", 560 "Print RPATH information",
314 "Write output stream to a filename", 561 "Print NEEDED information",
562 "Print INTERP information",
563 "Find a specified symbol",
315 "Print all scanned info (-x -e -t -r)\n", 564 "Print all scanned info (-x -e -t -r)\n",
316 "Only output 'bad' things", 565 "Only output 'bad' things",
317 "Be verbose (can be specified more than once)", 566 "Be verbose (can be specified more than once)",
567 "Use specified format for output",
568 "Write output stream to a filename",
318 "Don't display the header", 569 "Don't display the header",
319 "Print this help and exit", 570 "Print this help and exit",
320 "Print version and exit", 571 "Print version and exit",
321 NULL 572 NULL
322}; 573};
324/* display usage and exit */ 575/* display usage and exit */
325static void usage(int status) 576static void usage(int status)
326{ 577{
327 int i; 578 int i;
328 printf(" Scan ELF binaries for stuff\n\n" 579 printf(" Scan ELF binaries for stuff\n\n"
329 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 580 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
330 fputs("Options:\n", stdout); 581 printf("Options: -[%s]\n", PARSE_FLAGS);
331 for (i = 0; long_opts[i].name; ++i) 582 for (i = 0; long_opts[i].name; ++i)
583 if (long_opts[i].has_arg == no_argument)
332 printf(" -%c, --%-12s %s\n", long_opts[i].val, 584 printf(" -%c, --%-13s %s\n", long_opts[i].val,
333 long_opts[i].name, opts_help[i]); 585 long_opts[i].name, opts_help[i]);
334#ifdef MANLYPAGE 586 else
335 for (i = 0; long_opts[i].name; ++i) 587 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val,
336 printf(".TP\n\\fB\\-%c, \\-\\-%s\\fR\n%s\n", long_opts[i].val,
337 long_opts[i].name, opts_help[i]); 588 long_opts[i].name, opts_help[i]);
338#endif
339 exit(status); 589 exit(status);
340} 590}
341 591
342/* parse command line arguments and preform needed actions */ 592/* parse command line arguments and preform needed actions */
343static void parseargs(int argc, char *argv[]) 593static void parseargs(int argc, char *argv[])
346 596
347 opterr = 0; 597 opterr = 0;
348 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 598 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
349 switch (flag) { 599 switch (flag) {
350 600
351 case 'V': /* version info */ 601 case 'V':
352 printf("%s compiled %s\n%s\n" 602 printf("%s compiled %s\n%s\n"
353 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 603 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
354 __FILE__, __DATE__, rcsid, argv0); 604 __FILE__, __DATE__, rcsid, argv0);
355 exit(EXIT_SUCCESS); 605 exit(EXIT_SUCCESS);
356 break; 606 break;
357 case 's': /* reserved for -s, --symbol= */
358 case 'h': usage(EXIT_SUCCESS); break; 607 case 'h': usage(EXIT_SUCCESS); break;
359 608
360 case 'o': 609 case 'o': {
361 {
362 FILE *fp = NULL; 610 FILE *fp = NULL;
363 fp = freopen(optarg, "w", stdout); 611 fp = freopen(optarg, "w", stdout);
364 if (fp == NULL) { 612 if (fp == NULL)
365 fputs("open ", stderr); 613 err("Could not open output stream '%s': %s", optarg, strerror(errno));
366 perror(optarg);
367 } else
368 stdout = fp; 614 stdout = fp;
369 break; 615 break;
370 } 616 }
617
618 case 's': {
619 size_t len;
620 find_sym = xstrdup(optarg);
621 len = strlen(find_sym) + 1;
622 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
623 sprintf(versioned_symname, "%s@", find_sym);
624 break;
625 }
626
627 case 'F': {
628 out_format = strdup(optarg);
629 break;
630 }
631
632 case 'y': scan_symlink = 0; break;
371 case 'B': show_banner = 0; break; 633 case 'B': show_banner = 0; break;
372 case 'l': scan_ldpath = 1; break; 634 case 'l': scan_ldpath = 1; break;
373 case 'p': scan_envpath = 1; break; 635 case 'p': scan_envpath = 1; break;
374 case 'R': dir_recurse = 1; break; 636 case 'R': dir_recurse = 1; break;
375 case 'm': dir_crossmount = 0; break; 637 case 'm': dir_crossmount = 0; break;
376 case 'x': show_pax = 1; break; 638 case 'x': show_pax = 1; break;
377 case 'e': show_stack = 1; break; 639 case 'e': show_stack = 1; break;
378 case 't': show_textrel = 1; break; 640 case 't': show_textrel = 1; break;
379 case 'r': show_rpath = 1; break; 641 case 'r': show_rpath = 1; break;
642 case 'n': show_needed = 1; break;
643 case 'i': show_interp = 1; break;
380 case 'q': be_quiet = 1; break; 644 case 'q': be_quiet = 1; break;
381 case 'v': be_verbose = (be_verbose % 20) + 1; break; 645 case 'v': be_verbose = (be_verbose % 20) + 1; break;
382 case 'a': show_pax = show_stack = show_textrel = show_rpath = 1; break; 646 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break;
383 647
384 case ':': 648 case ':':
385 warn("Option missing parameter"); 649 warn("Option missing parameter\n");
386 usage(EXIT_FAILURE); 650 usage(EXIT_FAILURE);
387 break; 651 break;
388 case '?': 652 case '?':
389 warn("Unknown option"); 653 warn("Unknown option\n");
390 usage(EXIT_FAILURE); 654 usage(EXIT_FAILURE);
391 break; 655 break;
392 default: 656 default:
393 err("Unhandled option '%c'", flag); 657 err("Unhandled option '%c'", flag);
394 break; 658 break;
396 } 660 }
397 661
398 if (be_quiet && be_verbose) 662 if (be_quiet && be_verbose)
399 err("You can be quiet or you can be verbose, not both, stupid"); 663 err("You can be quiet or you can be verbose, not both, stupid");
400 664
665 /* let the format option override all other options */
666 if (out_format) {
667 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0;
668 for (flag=0; out_format[flag]; ++flag) {
669 if (out_format[flag] != '%') continue;
670
671 switch (out_format[++flag]) {
672 case '%': break;
673 case 'F': break;
674 case 's': break;
675 case 'o': break;
676 case 'x': show_pax = 1; break;
677 case 'e': show_stack = 1; break;
678 case 't': show_textrel = 1; break;
679 case 'r': show_rpath = 1; break;
680 case 'n': show_needed = 1; break;
681 case 'i': show_interp = 1; break;
682 default:
683 err("Invalid format specifier '%c' (byte %i)",
684 out_format[flag], flag+1);
685 }
686 }
687
688 /* construct our default format */
689 } else {
690 size_t fmt_len = 30;
691 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
692 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
693 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
694 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
695 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
696 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
697 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
698 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
699 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
700 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
701 }
702 if (be_verbose > 2) printf("Format: %s\n", out_format);
703
704 /* now lets actually do the scanning */
401 if (scan_ldpath) scanelf_ldpath(); 705 if (scan_ldpath) scanelf_ldpath();
402 if (scan_envpath) scanelf_envpath(); 706 if (scan_envpath) scanelf_envpath();
707 if (optind == argc && !scan_ldpath && !scan_envpath)
708 err("Nothing to scan !?");
403 while (optind < argc) 709 while (optind < argc)
404 scanelf_dir(argv[optind++]); 710 scanelf_dir(argv[optind++]);
711
712 /* clean up */
713 if (find_sym) {
714 free(find_sym);
715 free(versioned_symname);
716 }
717 if (out_format) free(out_format);
718}
719
720
721
722/* utility funcs */
723static char *xstrdup(char *s)
724{
725 char *ret = strdup(s);
726 if (!ret) err("Could not strdup(): %s", strerror(errno));
727 return ret;
728}
729static void *xmalloc(size_t size)
730{
731 void *ret = malloc(size);
732 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
733 return ret;
734}
735static void xstrcat(char **dst, const char *src, size_t *curr_len)
736{
737 long new_len;
738
739 new_len = strlen(*dst) + strlen(src);
740 if (*curr_len <= new_len) {
741 *curr_len = new_len + (*curr_len / 2);
742 *dst = realloc(*dst, *curr_len);
743 if (!*dst)
744 err("could not realloc %li bytes", (unsigned long)*curr_len);
745 }
746
747 strcat(*dst, src);
748}
749static inline void xchrcat(char **dst, const char append, size_t *curr_len)
750{
751 static char my_app[2];
752 my_app[0] = append;
753 my_app[1] = '\0';
754 xstrcat(dst, my_app, curr_len);
755}
756static int xemptybuffer(const char *buff)
757{
758 long i;
759 for (i=0; buff[i]; ++i)
760 if (buff[i] != ' ')
761 return 0;
762 return 1;
405} 763}
406 764
407 765
408 766
409int main(int argc, char *argv[]) 767int main(int argc, char *argv[])

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