/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.10 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 1.10 2005/03/30 23:43:30 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>
34#include <assert.h>
33 35
34#include "paxelf.h" 36#include "paxelf.h"
35 37
36static const char *rcsid = "$Id: scanelf.c,v 1.10 2005/03/30 23:43:30 vapier Exp $"; 38static const char *rcsid = "$Id: scanelf.c,v 1.40 2005/04/21 00:13:03 solar Exp $";
37 39#define argv0 "scanelf"
38
39/* helper functions for showing errors */
40#define argv0 "scanelf\0" /*((*argv != NULL) ? argv[0] : __FILE__ "\b\b")*/
41#define warn(fmt, args...) \
42 fprintf(stderr, "%s: " fmt "\n", argv0, ## args)
43#define warnf(fmt, args...) warn("%s(): " fmt, __FUNCTION__, ## args)
44#define err(fmt, args...) \
45 do { \
46 warn(fmt, ## args); \
47 exit(EXIT_FAILURE); \
48 } while (0)
49 40
50 41
51 42
52/* prototypes */ 43/* prototypes */
53static void scanelf_file(const char *filename); 44static void scanelf_file(const char *filename);
58static void parseargs(int argc, char *argv[]); 49static void parseargs(int argc, char *argv[]);
59 50
60/* variables to control behavior */ 51/* variables to control behavior */
61static char scan_ldpath = 0; 52static char scan_ldpath = 0;
62static char scan_envpath = 0; 53static char scan_envpath = 0;
54static char scan_symlink = 1;
63static char dir_recurse = 0; 55static char dir_recurse = 0;
56static char dir_crossmount = 1;
64static char show_pax = 0; 57static char show_pax = 0;
65static char show_stack = 0; 58static char show_stack = 0;
66static char show_textrel = 0; 59static char show_textrel = 0;
67static char show_rpath = 0; 60static char show_rpath = 0;
61static char show_needed = 0;
62static char show_interp = 0;
68static char show_header = 1; 63static char show_banner = 1;
69static char be_quiet = 0; 64static char be_quiet = 0;
65static char be_verbose = 0;
66static char *find_sym = NULL, *versioned_symname = NULL;
67static char *out_format = NULL;
70 68
71 69
72 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}
73/* scan an elf file and show all the fun stuff */ 287/* scan an elf file and show all the fun stuff */
74static void scanelf_file(const char *filename) 288static void scanelf_file(const char *filename)
75{ 289{
76 int i; 290 int i;
77 char found_stack = 0, found_textrel = 0, found_rpath = 0; 291 char found_pax, found_stack, found_relro, found_textrel,
78 Elf_Dyn *dyn; 292 found_rpath, found_needed, found_interp, found_sym,
293 found_file;
79 elfobj *elf = NULL; 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;
80 311
81 /* verify this is real ELF */ 312 /* verify this is real ELF */
82 if ((elf = readelf(filename)) == NULL) 313 if ((elf = readelf(filename)) == NULL) {
314 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
83 return; 315 return;
84 if (check_elf_header(elf->ehdr) || !IS_ELF(elf)) 316 }
85 goto bail; 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);
86 324
87 /* show the header */ 325 /* show the header */
88 if (!be_quiet && show_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 }
342 }
343 } else {
89 printf("TYPE "); 344 printf(" TYPE ");
90 if (show_pax) printf("PAX "); 345 if (show_pax) printf(" PAX ");
91 if (show_stack) printf("STACK "); 346 if (show_stack) printf("STK/REL ");
92 if (show_textrel) printf("TEXTREL "); 347 if (show_textrel) printf("TEXTREL ");
93 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");
94 printf("FILE\n"); 354 printf("\n");
95 show_header = 0; 355 show_banner = 0;
96 } 356 }
97 357
98 /* dump all the good stuff */ 358 /* dump all the good stuff */
99 if (!be_quiet) 359 if (!be_quiet && !out_format)
100 printf("%-7s ", get_elfetype(elf->ehdr->e_type)); 360 printf("%-7s ", get_elfetype(elf));
101 361
102 if (show_pax) 362 if (out_format) {
103 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf))); 363 for (i=0; out_format[i]; ++i) {
104 364 if (out_format[i] != '%') {
105 /* stack fun */ 365 printf("%c", out_format[i]);
106 if (show_stack) {
107 for (i = 0; i < elf->ehdr->e_phnum; i++) {
108 if (elf->phdr[i].p_type != PT_GNU_STACK && \
109 elf->phdr[i].p_type != PT_GNU_RELRO) continue;
110
111 if (be_quiet && !(elf->phdr[i].p_flags & PF_X))
112 continue; 366 continue;
113
114 found_stack = 1;
115 printf("%s ", gnu_short_stack_flags(elf->phdr[i].p_flags));
116 }
117 if (!be_quiet && !found_stack) printf("- ");
118 }
119
120 /* textrel fun */
121 if (show_textrel) {
122 for (i = 0; i < elf->ehdr->e_phnum; i++) {
123 if (elf->phdr[i].p_type != PT_DYNAMIC) continue;
124
125 dyn = (Elf_Dyn *)(elf->data + elf->phdr[i].p_offset);
126 while (dyn->d_tag != DT_NULL) {
127 if (dyn->d_tag == DT_TEXTREL) { //dyn->d_tag != DT_FLAGS)
128 found_textrel = 1;
129// if (dyn->d_un.d_val & DF_TEXTREL)
130 printf("TEXTREL ");
131 }
132 ++dyn;
133 } 367 }
134 }
135 if (!be_quiet && !found_textrel) printf("- ");
136 }
137 368
138 /* rpath fun */ 369 switch (out_format[++i]) {
139 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 370 case '%': printf("%%"); break;
140 if (show_rpath) { 371 case 'F': found_file = 1; printf("%s ", filename); break;
141 Elf_Shdr *strtbl = elf_findsecbyname(elf, ".dynstr"); 372 case 'x': scanelf_file_pax(elf, &found_pax); break;
142 373 case 'e': scanelf_file_stack(elf, &found_stack, &found_relro); break;
143 if (strtbl) 374 case 't': scanelf_file_textrel(elf, &found_textrel); break;
144 for (i = 0; i < elf->ehdr->e_phnum; i++) { 375 case 'r': scanelf_file_rpath(elf, &found_rpath); break;
145 if (elf->phdr[i].p_type != PT_DYNAMIC) continue; 376 case 'n': scanelf_file_needed(elf, &found_needed); break;
146 377 case 'i': scanelf_file_interp(elf, &found_interp); break;
147 dyn = (Elf_Dyn *)(elf->data + elf->phdr[i].p_offset); 378 case 's': scanelf_file_sym(elf, &found_sym, filename); break;
148 while (dyn->d_tag != DT_NULL) {
149 if (dyn->d_tag == DT_RPATH) { //|| dyn->d_tag != DT_RUNPATH)
150 char *rpath = elf->data + strtbl->sh_offset + dyn->d_un.d_ptr;
151 found_rpath = 1;
152 printf("%s ", rpath);
153 }
154 ++dyn;
155 } 379 }
156 } 380 }
157 if (!be_quiet && !found_rpath) printf("- "); 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);
158 } 389 }
159 390
391 if (!found_file) {
160 if (!be_quiet || show_pax || found_stack || found_textrel || found_rpath) 392 if (!be_quiet || found_pax || found_stack || found_textrel || \
161 printf("%s\n", filename); 393 found_rpath || found_needed || found_sym)
394 puts(filename);
395 } else {
396 printf("\n");
397 }
162 398
163bail:
164 unreadelf(elf); 399 unreadelf(elf);
165} 400}
166 401
167/* 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 */
168static void scanelf_dir(const char *path) 403static void scanelf_dir(const char *path)
169{ 404{
170 register DIR *dir; 405 register DIR *dir;
171 register struct dirent *dentry; 406 register struct dirent *dentry;
172 struct stat st; 407 struct stat st_top, st;
173 char *p; 408 char buf[_POSIX_PATH_MAX];
174 int len = 0; 409 size_t pathlen = 0, len = 0;
175 410
176 /* make sure path exists */ 411 /* make sure path exists */
177 if (lstat(path, &st) == -1) 412 if (lstat(path, &st_top) == -1) {
413 if (be_verbose > 2) printf("%s: does not exist\n", path);
178 return; 414 return;
415 }
416
179 /* 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 */
180 if (!S_ISDIR(st.st_mode)) { 418 if (!S_ISDIR(st_top.st_mode)) {
181 scanelf_file(path); 419 scanelf_file(path);
182 return; 420 return;
183 } 421 }
184 422
185 /* now scan the dir looking for fun stuff */ 423 /* now scan the dir looking for fun stuff */
186 if ((dir = opendir(path)) == NULL) { 424 if ((dir = opendir(path)) == NULL) {
187 warnf("could not opendir %s: %s", path, strerror(errno)); 425 warnf("could not opendir %s: %s", path, strerror(errno));
188 return; 426 return;
189 } 427 }
428 if (be_verbose) printf("%s: scanning dir\n", path);
429
430 pathlen = strlen(path);
190 while ((dentry = readdir(dir))) { 431 while ((dentry = readdir(dir))) {
191 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 432 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
192 continue; 433 continue;
193 len = (strlen(path) + 2 + strlen(dentry->d_name)); 434 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
194 p = malloc(len); 435 if (len >= sizeof(buf)) {
195 if (!p) 436 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
196 err("scanelf_dir(): Could not malloc: %s", strerror(errno)); 437 continue;
197 strncpy(p, path, len); 438 }
198 strncat(p, "/", len); 439 sprintf(buf, "%s/%s", path, dentry->d_name);
199 strncat(p, dentry->d_name, len);
200 if (lstat(p, &st) != -1) { 440 if (lstat(buf, &st) != -1) {
201 if (S_ISREG(st.st_mode)) 441 if (S_ISREG(st.st_mode))
202 scanelf_file(p); 442 scanelf_file(buf);
203 else if (dir_recurse && S_ISDIR(st.st_mode)) { 443 else if (dir_recurse && S_ISDIR(st.st_mode)) {
444 if (dir_crossmount || (st_top.st_dev == st.st_dev))
204 scanelf_dir(p); 445 scanelf_dir(buf);
205 } 446 }
206 } 447 }
207 free(p);
208 } 448 }
209 closedir(dir); 449 closedir(dir);
210} 450}
211 451
212/* scan /etc/ld.so.conf for paths */ 452/* scan /etc/ld.so.conf for paths */
213static void scanelf_ldpath() 453static void scanelf_ldpath()
214{ 454{
455 char scan_l, scan_ul, scan_ull;
215 char *path, *p; 456 char *path, *p;
216 FILE *fp; 457 FILE *fp;
217 458
218 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 459 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
219 err("Unable to open ld.so.conf: %s", strerror(errno)); 460 err("Unable to open ld.so.conf: %s", strerror(errno));
220 461
462 scan_l = scan_ul = scan_ull = 0;
463
221 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 }
222 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 468 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
223 if (*path == '/') { 469 if (*path == '/') {
224 if ((p = strrchr(path, '\r')) != NULL) 470 if ((p = strrchr(path, '\r')) != NULL)
225 *p = 0; 471 *p = 0;
226 if ((p = strrchr(path, '\n')) != NULL) 472 if ((p = strrchr(path, '\n')) != NULL)
227 *p = 0; 473 *p = 0;
474 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1;
475 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1;
476 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
228 scanelf_dir(path); 477 scanelf_dir(path);
229 } 478 }
230 free(path); 479 free(path);
231
232 fclose(fp); 480 fclose(fp);
481
482 if (!scan_l) scanelf_dir("/lib");
483 if (!scan_ul) scanelf_dir("/usr/lib");
484 if (!scan_ull) scanelf_dir("/usr/local/lib");
233} 485}
234 486
235/* scan env PATH for paths */ 487/* scan env PATH for paths */
236static void scanelf_envpath() 488static void scanelf_envpath()
237{ 489{
240 path = getenv("PATH"); 492 path = getenv("PATH");
241 if (!path) 493 if (!path)
242 err("PATH is not set in your env !"); 494 err("PATH is not set in your env !");
243 495
244 if ((path = strdup(path)) == NULL) 496 if ((path = strdup(path)) == NULL)
245 err("stdup failed: %s", strerror(errno)); 497 err("strdup failed: %s", strerror(errno));
246 498
247 while ((p = strrchr(path, ':')) != NULL) { 499 while ((p = strrchr(path, ':')) != NULL) {
248 scanelf_dir(p + 1); 500 scanelf_dir(p + 1);
249 *p = 0; 501 *p = 0;
250 } 502 }
503
251 free(path); 504 free(path);
252} 505}
253 506
254 507
255 508
256/* usage / invocation handling functions */ 509/* usage / invocation handling functions */
257#define PARSE_FLAGS "plRxstraqhV" 510#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV"
511#define a_argument required_argument
258static struct option const long_opts[] = { 512static struct option const long_opts[] = {
259 {"path", no_argument, NULL, 'p'}, 513 {"path", no_argument, NULL, 'p'},
260 {"ldpath", no_argument, NULL, 'l'}, 514 {"ldpath", no_argument, NULL, 'l'},
261 {"recursive", no_argument, NULL, 'R'}, 515 {"recursive", no_argument, NULL, 'R'},
516 {"mount", no_argument, NULL, 'm'},
517 {"symlink", no_argument, NULL, 'y'},
262 {"pax", no_argument, NULL, 'x'}, 518 {"pax", no_argument, NULL, 'x'},
263 {"stack", no_argument, NULL, 's'}, 519 {"header", no_argument, NULL, 'e'},
264 {"textrel", no_argument, NULL, 't'}, 520 {"textrel", no_argument, NULL, 't'},
265 {"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'},
266 {"all", no_argument, NULL, 'a'}, 525 {"all", no_argument, NULL, 'a'},
267 {"quiet", no_argument, NULL, 'q'}, 526 {"quiet", no_argument, NULL, 'q'},
268/* {"vebose", no_argument, NULL, 'v'},*/ 527 {"verbose", no_argument, NULL, 'v'},
528 {"format", a_argument, NULL, 'F'},
529 {"file", a_argument, NULL, 'o'},
530 {"nobanner", no_argument, NULL, 'B'},
269 {"help", no_argument, NULL, 'h'}, 531 {"help", no_argument, NULL, 'h'},
270 {"version", no_argument, NULL, 'V'}, 532 {"version", no_argument, NULL, 'V'},
271 {NULL, no_argument, NULL, 0x0} 533 {NULL, no_argument, NULL, 0x0}
272}; 534};
273static char *opts_help[] = { 535static char *opts_help[] = {
274 "Scan all directories in PATH environment", 536 "Scan all directories in PATH environment",
275 "Scan all directories in /etc/ld.so.conf", 537 "Scan all directories in /etc/ld.so.conf",
276 "Scan directories recursively\n", 538 "Scan directories recursively",
539 "Don't recursively cross mount points",
540 "Don't scan symlinks\n",
277 "Print PaX markings", 541 "Print PaX markings",
278 "Print GNU_STACK markings", 542 "Print GNU_STACK markings",
279 "Print TEXTREL information", 543 "Print TEXTREL information",
280 "Print RPATH information", 544 "Print RPATH information",
545 "Print NEEDED information",
546 "Print INTERP information",
547 "Find a specified symbol",
281 "Print all scanned info", 548 "Print all scanned info (-x -e -t -r)\n",
282 "Only output 'bad' things\n", 549 "Only output 'bad' things",
283/* "Be verbose !",*/ 550 "Be verbose (can be specified more than once)",
551 "Use specified format for output",
552 "Write output stream to a filename",
553 "Don't display the header",
284 "Print this help and exit", 554 "Print this help and exit",
285 "Print version and exit", 555 "Print version and exit",
286 NULL 556 NULL
287}; 557};
288 558
289/* display usage and exit */ 559/* display usage and exit */
290static void usage(int status) 560static void usage(int status)
291{ 561{
292 int i; 562 int i;
293 printf(" Scan ELF binaries for stuff\n\n" 563 printf(" Scan ELF binaries for stuff\n\n"
294 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 564 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
295 printf("Options:\n"); 565 printf("Options: -[%s]\n", PARSE_FLAGS);
296 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)
297 printf(" -%c, --%-12s %s\n", long_opts[i].val, 568 printf(" -%c, --%-13s %s\n", long_opts[i].val,
298 long_opts[i].name, opts_help[i]); 569 long_opts[i].name, opts_help[i]);
570 else
571 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val,
572 long_opts[i].name, opts_help[i]);
299 exit(status); 573 exit(status);
300} 574}
301 575
302/* parse command line arguments and preform needed actions */ 576/* parse command line arguments and preform needed actions */
303static void parseargs(int argc, char *argv[]) 577static void parseargs(int argc, char *argv[])
306 580
307 opterr = 0; 581 opterr = 0;
308 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) {
309 switch (flag) { 583 switch (flag) {
310 584
311 case 'V': /* version info */ 585 case 'V':
312 printf("%s compiled %s\n" 586 printf("%s compiled %s\n%s\n"
313 "%s written for Gentoo Linux by <solar@gentoo.org>\n" 587 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
314 "%s\n",
315 __FILE__, __DATE__, argv0, rcsid); 588 __FILE__, __DATE__, rcsid, argv0);
316 exit(EXIT_SUCCESS); 589 exit(EXIT_SUCCESS);
317 break; 590 break;
318 case 'h': usage(EXIT_SUCCESS); break; 591 case 'h': usage(EXIT_SUCCESS); break;
319 592
593 case 'o': {
594 FILE *fp = NULL;
595 fp = freopen(optarg, "w", stdout);
596 if (fp == NULL)
597 err("Could not open output stream '%s': %s", optarg, strerror(errno));
598 stdout = fp;
599 break;
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;
630 case 'B': show_banner = 0; break;
320 case 'l': scan_ldpath = 1; break; 631 case 'l': scan_ldpath = 1; break;
321 case 'p': scan_envpath = 1; break; 632 case 'p': scan_envpath = 1; break;
322 case 'R': dir_recurse = 1; break; 633 case 'R': dir_recurse = 1; break;
634 case 'm': dir_crossmount = 0; break;
323 case 'x': show_pax = 1; break; 635 case 'x': show_pax = 1; break;
324 case 's': show_stack = 1; break; 636 case 'e': show_stack = 1; break;
325 case 't': show_textrel = 1; break; 637 case 't': show_textrel = 1; break;
326 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;
327 case 'q': be_quiet = 1; break; 641 case 'q': be_quiet = 1; break;
642 case 'v': be_verbose = (be_verbose % 20) + 1; break;
328 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;
329 644
330 case ':': 645 case ':':
331 warn("Option missing parameter"); 646 warn("Option missing parameter\n");
332 usage(EXIT_FAILURE); 647 usage(EXIT_FAILURE);
333 break; 648 break;
334 case '?': 649 case '?':
335 warn("Unknown option"); 650 warn("Unknown option\n");
336 usage(EXIT_FAILURE); 651 usage(EXIT_FAILURE);
337 break; 652 break;
338 default: 653 default:
339 err("Unhandled option '%c'", flag); 654 err("Unhandled option '%c'", flag);
340 break; 655 break;
341 } 656 }
342 } 657 }
343 658
659 if (be_quiet && be_verbose)
660 err("You can be quiet or you can be verbose, not both, stupid");
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 */
344 if (scan_ldpath) scanelf_ldpath(); 686 if (scan_ldpath) scanelf_ldpath();
345 if (scan_envpath) scanelf_envpath(); 687 if (scan_envpath) scanelf_envpath();
688 if (optind == argc && !scan_ldpath && !scan_envpath)
689 err("Nothing to scan !?");
346 while (optind < argc) 690 while (optind < argc)
347 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);
348} 699}
349 700
350 701
351 702
352int main(int argc, char *argv[]) 703int main(int argc, char *argv[])
353{ 704{
354 if (argc < 2) 705 if (argc < 2)
355 usage(EXIT_FAILURE); 706 usage(EXIT_FAILURE);
356 parseargs(argc, argv); 707 parseargs(argc, argv);
708 fclose(stdout);
357 return EXIT_SUCCESS; 709 return EXIT_SUCCESS;
358} 710}

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