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Revision 1.43 - (show annotations) (download) (as text)
Fri May 6 02:55:27 2005 UTC (9 years, 5 months ago) by vapier
Branch: MAIN
Changes since 1.42: +4 -4 lines
File MIME type: text/x-csrc
err we need the buffer to be a real string since we use it later in strcat

1 /*
2 * Copyright 2003 Ned Ludd <solar@gentoo.org>
3 * Copyright 1999-2005 Gentoo Foundation
4 * Distributed under the terms of the GNU General Public License v2
5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.42 2005/05/06 02:40:15 vapier Exp $
6 *
7 ********************************************************************
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 * MA 02111-1307, USA.
22 */
23
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <sys/types.h>
27 #define __USE_GNU
28 #include <string.h>
29 #include <errno.h>
30 #include <unistd.h>
31 #include <sys/stat.h>
32 #include <dirent.h>
33 #include <getopt.h>
34 #include <assert.h>
35
36 #include "paxelf.h"
37
38 static const char *rcsid = "$Id: scanelf.c,v 1.42 2005/05/06 02:40:15 vapier Exp $";
39 #define argv0 "scanelf"
40
41
42
43 /* prototypes */
44 static void scanelf_file(const char *filename);
45 static void scanelf_dir(const char *path);
46 static void scanelf_ldpath();
47 static void scanelf_envpath();
48 static void usage(int status);
49 static void parseargs(int argc, char *argv[]);
50 static char *xstrdup(char *s);
51 static void *xmalloc(size_t size);
52 static void xstrcat(char **dst, const char *src, size_t *curr_len);
53 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
54 static int xemptybuffer(const char *buff);
55
56 /* variables to control behavior */
57 static char scan_ldpath = 0;
58 static char scan_envpath = 0;
59 static char scan_symlink = 1;
60 static char dir_recurse = 0;
61 static char dir_crossmount = 1;
62 static char show_pax = 0;
63 static char show_stack = 0;
64 static char show_textrel = 0;
65 static char show_rpath = 0;
66 static char show_needed = 0;
67 static char show_interp = 0;
68 static char show_banner = 1;
69 static char be_quiet = 0;
70 static char be_verbose = 0;
71 static char *find_sym = NULL, *versioned_symname = NULL;
72 static char *out_format = NULL;
73
74
75
76 /* sub-funcs for scanelf_file() */
77 static 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 }
91 static 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 }
128 static 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 }
159 static 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 }
214 static 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 }
248 static 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 }
268 static 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 }
313 /* scan an elf file and show all the fun stuff */
314 #define prints(str) fputs(str, stdout)
315 static void scanelf_file(const char *filename)
316 {
317 int i;
318 char found_pax, found_stack, found_relro, found_textrel,
319 found_rpath, found_needed, found_interp, found_sym,
320 found_file;
321 elfobj *elf;
322 struct stat st;
323 static char *out_buffer = NULL;
324 static size_t out_len;
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
337 found_pax = found_stack = found_relro = found_textrel = \
338 found_rpath = found_needed = found_interp = found_sym = \
339 found_file = 0;
340
341 /* verify this is real ELF */
342 if ((elf = readelf(filename)) == NULL) {
343 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
344 return;
345 }
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)
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';
360
361 /* show the header */
362 if (!be_quiet && show_banner) {
363 for (i=0; out_format[i]; ++i) {
364 if (out_format[i] != '%') continue;
365
366 switch (out_format[++i]) {
367 case '%': break;
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");
380 show_banner = 0;
381 }
382
383 /* dump all the good stuff */
384 for (i=0; out_format[i]; ++i) {
385 const char *out;
386
387 /* make sure we trim leading spaces in quiet mode */
388 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
389 *out_buffer = '\0';
390
391 if (out_format[i] != '%') {
392 xchrcat(&out_buffer, out_format[i], &out_len);
393 continue;
394 }
395
396 out = NULL;
397 switch (out_format[++i]) {
398 case '%': xchrcat(&out_buffer, '%', &out_len); break;
399 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
400 case 'o': out = get_elfetype(elf); break;
401 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
402 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
403 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
404 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
405 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
406 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
407 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
408 }
409 if (out) xstrcat(&out_buffer, out, &out_len);
410 }
411
412 if (!found_file) {
413 if (!be_quiet || found_pax || found_stack || found_textrel || \
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);
419
420 unreadelf(elf);
421 }
422
423 /* scan a directory for ET_EXEC files and print when we find one */
424 static void scanelf_dir(const char *path)
425 {
426 register DIR *dir;
427 register struct dirent *dentry;
428 struct stat st_top, st;
429 char buf[_POSIX_PATH_MAX];
430 size_t pathlen = 0, len = 0;
431
432 /* make sure path exists */
433 if (lstat(path, &st_top) == -1) {
434 if (be_verbose > 2) printf("%s: does not exist\n", path);
435 return;
436 }
437
438 /* ok, if it isn't a directory, assume we can open it */
439 if (!S_ISDIR(st_top.st_mode)) {
440 scanelf_file(path);
441 return;
442 }
443
444 /* now scan the dir looking for fun stuff */
445 if ((dir = opendir(path)) == NULL) {
446 warnf("could not opendir %s: %s", path, strerror(errno));
447 return;
448 }
449 if (be_verbose) printf("%s: scanning dir\n", path);
450
451 pathlen = strlen(path);
452 while ((dentry = readdir(dir))) {
453 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
454 continue;
455 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
456 if (len >= sizeof(buf)) {
457 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
458 continue;
459 }
460 sprintf(buf, "%s/%s", path, dentry->d_name);
461 if (lstat(buf, &st) != -1) {
462 if (S_ISREG(st.st_mode))
463 scanelf_file(buf);
464 else if (dir_recurse && S_ISDIR(st.st_mode)) {
465 if (dir_crossmount || (st_top.st_dev == st.st_dev))
466 scanelf_dir(buf);
467 }
468 }
469 }
470 closedir(dir);
471 }
472
473 /* scan /etc/ld.so.conf for paths */
474 static void scanelf_ldpath()
475 {
476 char scan_l, scan_ul, scan_ull;
477 char *path, *p;
478 FILE *fp;
479
480 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
481 err("Unable to open ld.so.conf: %s", strerror(errno));
482
483 scan_l = scan_ul = scan_ull = 0;
484
485 path = (char*)xmalloc(_POSIX_PATH_MAX);
486 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
487 if (*path == '/') {
488 if ((p = strrchr(path, '\r')) != NULL)
489 *p = 0;
490 if ((p = strrchr(path, '\n')) != NULL)
491 *p = 0;
492 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1;
493 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1;
494 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
495 scanelf_dir(path);
496 }
497 free(path);
498 fclose(fp);
499
500 if (!scan_l) scanelf_dir("/lib");
501 if (!scan_ul) scanelf_dir("/usr/lib");
502 if (!scan_ull) scanelf_dir("/usr/local/lib");
503 }
504
505 /* scan env PATH for paths */
506 static void scanelf_envpath()
507 {
508 char *path, *p;
509
510 path = getenv("PATH");
511 if (!path)
512 err("PATH is not set in your env !");
513 path = xstrdup(path);
514
515 while ((p = strrchr(path, ':')) != NULL) {
516 scanelf_dir(p + 1);
517 *p = 0;
518 }
519
520 free(path);
521 }
522
523
524
525 /* usage / invocation handling functions */
526 #define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV"
527 #define a_argument required_argument
528 static struct option const long_opts[] = {
529 {"path", no_argument, NULL, 'p'},
530 {"ldpath", no_argument, NULL, 'l'},
531 {"recursive", no_argument, NULL, 'R'},
532 {"mount", no_argument, NULL, 'm'},
533 {"symlink", no_argument, NULL, 'y'},
534 {"pax", no_argument, NULL, 'x'},
535 {"header", no_argument, NULL, 'e'},
536 {"textrel", no_argument, NULL, 't'},
537 {"rpath", no_argument, NULL, 'r'},
538 {"needed", no_argument, NULL, 'n'},
539 {"interp", no_argument, NULL, 'i'},
540 {"symbol", a_argument, NULL, 's'},
541 {"all", no_argument, NULL, 'a'},
542 {"quiet", no_argument, NULL, 'q'},
543 {"verbose", no_argument, NULL, 'v'},
544 {"format", a_argument, NULL, 'F'},
545 {"file", a_argument, NULL, 'o'},
546 {"nobanner", no_argument, NULL, 'B'},
547 {"help", no_argument, NULL, 'h'},
548 {"version", no_argument, NULL, 'V'},
549 {NULL, no_argument, NULL, 0x0}
550 };
551 static char *opts_help[] = {
552 "Scan all directories in PATH environment",
553 "Scan all directories in /etc/ld.so.conf",
554 "Scan directories recursively",
555 "Don't recursively cross mount points",
556 "Don't scan symlinks\n",
557 "Print PaX markings",
558 "Print GNU_STACK markings",
559 "Print TEXTREL information",
560 "Print RPATH information",
561 "Print NEEDED information",
562 "Print INTERP information",
563 "Find a specified symbol",
564 "Print all scanned info (-x -e -t -r)\n",
565 "Only output 'bad' things",
566 "Be verbose (can be specified more than once)",
567 "Use specified format for output",
568 "Write output stream to a filename",
569 "Don't display the header",
570 "Print this help and exit",
571 "Print version and exit",
572 NULL
573 };
574
575 /* display usage and exit */
576 static void usage(int status)
577 {
578 int i;
579 printf(" Scan ELF binaries for stuff\n\n"
580 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
581 printf("Options: -[%s]\n", PARSE_FLAGS);
582 for (i = 0; long_opts[i].name; ++i)
583 if (long_opts[i].has_arg == no_argument)
584 printf(" -%c, --%-13s %s\n", long_opts[i].val,
585 long_opts[i].name, opts_help[i]);
586 else
587 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val,
588 long_opts[i].name, opts_help[i]);
589 exit(status);
590 }
591
592 /* parse command line arguments and preform needed actions */
593 static void parseargs(int argc, char *argv[])
594 {
595 int flag;
596
597 opterr = 0;
598 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
599 switch (flag) {
600
601 case 'V':
602 printf("%s compiled %s\n%s\n"
603 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
604 __FILE__, __DATE__, rcsid, argv0);
605 exit(EXIT_SUCCESS);
606 break;
607 case 'h': usage(EXIT_SUCCESS); break;
608
609 case 'o': {
610 FILE *fp = NULL;
611 fp = freopen(optarg, "w", stdout);
612 if (fp == NULL)
613 err("Could not open output stream '%s': %s", optarg, strerror(errno));
614 stdout = fp;
615 break;
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;
633 case 'B': show_banner = 0; break;
634 case 'l': scan_ldpath = 1; break;
635 case 'p': scan_envpath = 1; break;
636 case 'R': dir_recurse = 1; break;
637 case 'm': dir_crossmount = 0; break;
638 case 'x': show_pax = 1; break;
639 case 'e': show_stack = 1; break;
640 case 't': show_textrel = 1; break;
641 case 'r': show_rpath = 1; break;
642 case 'n': show_needed = 1; break;
643 case 'i': show_interp = 1; break;
644 case 'q': be_quiet = 1; break;
645 case 'v': be_verbose = (be_verbose % 20) + 1; break;
646 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break;
647
648 case ':':
649 warn("Option missing parameter\n");
650 usage(EXIT_FAILURE);
651 break;
652 case '?':
653 warn("Unknown option\n");
654 usage(EXIT_FAILURE);
655 break;
656 default:
657 err("Unhandled option '%c'", flag);
658 break;
659 }
660 }
661
662 if (be_quiet && be_verbose)
663 err("You can be quiet or you can be verbose, not both, stupid");
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 */
705 if (scan_ldpath) scanelf_ldpath();
706 if (scan_envpath) scanelf_envpath();
707 if (optind == argc && !scan_ldpath && !scan_envpath)
708 err("Nothing to scan !?");
709 while (optind < argc)
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 */
723 static char *xstrdup(char *s)
724 {
725 char *ret = strdup(s);
726 if (!ret) err("Could not strdup(): %s", strerror(errno));
727 return ret;
728 }
729 static 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 }
735 static 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 }
749 static 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 }
756 static 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;
763 }
764
765
766
767 int main(int argc, char *argv[])
768 {
769 if (argc < 2)
770 usage(EXIT_FAILURE);
771 parseargs(argc, argv);
772 fclose(stdout);
773 return EXIT_SUCCESS;
774 }

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