/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.30 Revision 1.61
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 1.30 2005/04/05 16:15:31 solar Exp $ 5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.61 2005/05/28 22:09:36 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#include <libgen.h>
28#include <limits.h>
27#define __USE_GNU 29#define __USE_GNU
28#include <string.h> 30#include <string.h>
29#include <errno.h> 31#include <errno.h>
30#include <unistd.h> 32#include <unistd.h>
31#include <sys/stat.h> 33#include <sys/stat.h>
32#include <dirent.h> 34#include <dirent.h>
33#include <getopt.h> 35#include <getopt.h>
34#include <assert.h> 36#include <assert.h>
35
36#include "paxelf.h" 37#include "paxelf.h"
37 38
38static const char *rcsid = "$Id: scanelf.c,v 1.30 2005/04/05 16:15:31 solar Exp $"; 39static const char *rcsid = "$Id: scanelf.c,v 1.61 2005/05/28 22:09:36 solar Exp $";
39 40#define argv0 "scanelf"
40
41/* helper functions for showing errors */
42#define argv0 "scanelf" /*((*argv != NULL) ? argv[0] : __FILE__ "\b\b")*/
43#define warn(fmt, args...) \
44 fprintf(stderr, "%s: " fmt "\n", argv0, ## args)
45#define warnf(fmt, args...) warn("%s(): " fmt, __FUNCTION__, ## args)
46#define err(fmt, args...) \
47 do { \
48 warn(fmt, ## args); \
49 exit(EXIT_FAILURE); \
50 } while (0)
51 41
52 42
53 43
54/* prototypes */ 44/* prototypes */
55static void scanelf_file(const char *filename); 45static void scanelf_file(const char *filename);
56static void scanelf_dir(const char *path); 46static void scanelf_dir(const char *path);
57static void scanelf_ldpath(); 47static void scanelf_ldpath();
58static void scanelf_envpath(); 48static void scanelf_envpath();
59static void usage(int status); 49static void usage(int status);
60static void parseargs(int argc, char *argv[]); 50static void parseargs(int argc, char *argv[]);
51static char *xstrdup(const char *s);
52static void *xmalloc(size_t size);
53static void xstrcat(char **dst, const char *src, size_t *curr_len);
54static inline void xchrcat(char **dst, const char append, size_t *curr_len);
61 55
62/* variables to control behavior */ 56/* variables to control behavior */
57static char *ldpaths[256];
63static char scan_ldpath = 0; 58static char scan_ldpath = 0;
64static char scan_envpath = 0; 59static char scan_envpath = 0;
60static char scan_symlink = 1;
65static char dir_recurse = 0; 61static char dir_recurse = 0;
66static char dir_crossmount = 1; 62static char dir_crossmount = 1;
67static char show_pax = 0; 63static char show_pax = 0;
68static char show_stack = 0; 64static char show_stack = 0;
69static char show_textrel = 0; 65static char show_textrel = 0;
70static char show_rpath = 0; 66static char show_rpath = 0;
67static char show_needed = 0;
68static char show_interp = 0;
69static char show_bind = 0;
71static char show_banner = 1; 70static char show_banner = 1;
72static char be_quiet = 0; 71static char be_quiet = 0;
73static char be_verbose = 0; 72static char be_verbose = 0;
73static char *find_sym = NULL, *versioned_symname = NULL;
74static char *find_sym = NULL; 74static char *out_format = NULL;
75 75
76 76
77 77/* sub-funcs for scanelf_file() */
78/* scan an elf file and show all the fun stuff */ 78static char *scanelf_file_pax(elfobj *elf, char *found_pax)
79static void scanelf_file(const char *filename)
80{ 79{
81 int i; 80 static char *paxflags;
82 char found_pax, found_stack, found_relro, found_textrel, found_rpath, found_sym; 81 static char ret[7];
83 elfobj *elf; 82 unsigned long i, shown;
84 83
85 found_pax = found_stack = found_relro = found_textrel = found_rpath = found_sym = 0;
86 84
87 /* verify this is real ELF */ 85 if (!show_pax) return NULL;
88 if ((elf = readelf(filename)) == NULL) {
89 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
90 return;
91 }
92 86
93 if (be_verbose > 1)
94 printf("%s: {%s,%s} scanning file\n", filename,
95 get_elfeitype(elf, EI_CLASS, elf->elf_class),
96 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
97 else if (be_verbose)
98 printf("%s: scanning file\n", filename);
99
100 /* show the header */
101 if (!be_quiet && show_banner) {
102 printf(" TYPE ");
103 if (show_pax) printf(" PAX ");
104 if (show_stack) printf(" STK/REL ");
105 if (show_textrel) printf("TEXTREL ");
106 if (show_rpath) printf("RPATH ");
107 printf(" FILE\n");
108 show_banner = 0; 87 shown = 0;
109 } 88 memset(&ret, 0, sizeof(ret));
110 89
111 /* dump all the good stuff */ 90 if (elf->phdr) {
112 if (!be_quiet) 91#define SHOW_PAX(B) \
113 printf("%-7s ", get_elfetype(elf)); 92 if (elf->elf_class == ELFCLASS ## B) { \
93 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
94 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
95 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
96 if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
97 continue; \
98 if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
99 continue; \
100 memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
101 *found_pax = 1; \
102 ++shown; \
103 break; \
104 } \
105 }
106 SHOW_PAX(32)
107 SHOW_PAX(64)
108 }
114 109
115 if (show_pax) { 110 /* fall back to EI_PAX if no PT_PAX was found */
111 if (!*ret) {
116 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); 112 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
117 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { 113 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
118 found_pax = 1; 114 *found_pax = 1;
119 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf))); 115 return paxflags;
120 }
121 } 116 }
117 strncpy(ret, paxflags, sizeof(ret));
118 // ++shown;
119 }
122 120
123 /* stack fun */ 121 if (be_quiet && !shown)
124 if (show_stack) { 122 return NULL;
123 return ret;
124
125}
126static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
127{
128 static char ret[8] = "--- ---";
129 char *found;
130 unsigned long i, off, shown;
131
132 if (!show_stack) return NULL;
133
134 shown = 0;
135
136 if (elf->phdr) {
125#define SHOW_STACK(B) \ 137#define SHOW_STACK(B) \
126 if (elf->elf_class == ELFCLASS ## B) { \ 138 if (elf->elf_class == ELFCLASS ## B) { \
127 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 139 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
128 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 140 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
129 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 141 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
130 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 142 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
131 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \ 143 found = found_stack; \
144 off = 0; \
145 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
146 found = found_relro; \
147 off = 4; \
148 } else \
149 continue; \
132 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 150 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
133 continue; \ 151 continue; \
152 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
153 *found = 1; \
154 ++shown; \
155 } \
156 }
157 SHOW_STACK(32)
158 SHOW_STACK(64)
159 }
160
161 if (be_quiet && !shown)
162 return NULL;
163 else
164 return ret;
165}
166static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
167{
168 static char *ret = "TEXTREL";
169 unsigned long i;
170
171 if (!show_textrel) return NULL;
172
173 if (elf->phdr) {
174#define SHOW_TEXTREL(B) \
175 if (elf->elf_class == ELFCLASS ## B) { \
176 Elf ## B ## _Dyn *dyn; \
177 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
178 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
179 Elf ## B ## _Off offset; \
180 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
134 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \ 181 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
135 found_stack = 1; \ 182 offset = EGET(phdr[i].p_offset); \
136 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \ 183 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
184 dyn = DYN ## B (elf->data + offset); \
185 while (EGET(dyn->d_tag) != DT_NULL) { \
186 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
137 found_relro = 1; \ 187 *found_textrel = 1; \
138 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \ 188 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
189 return ret; \
190 } \
191 ++dyn; \
139 } \ 192 } \
140 }
141 SHOW_STACK(32)
142 SHOW_STACK(64)
143 if (!be_quiet && !found_stack) printf("--- ");
144 if (!be_quiet && !found_relro) printf("--- ");
145 }
146
147 /* textrel fun */
148 if (show_textrel) {
149#define SHOW_TEXTREL(B) \
150 if (elf->elf_class == ELFCLASS ## B) { \
151 Elf ## B ## _Dyn *dyn; \
152 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
153 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
154 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
155 if (phdr[i].p_type != PT_DYNAMIC) continue; \
156 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
157 while (EGET(dyn->d_tag) != DT_NULL) { \
158 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
159 found_textrel = 1; \
160 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
161 printf("TEXTREL "); \
162 } \
163 ++dyn; \
164 } \
165 } } 193 } }
166 SHOW_TEXTREL(32) 194 SHOW_TEXTREL(32)
167 SHOW_TEXTREL(64) 195 SHOW_TEXTREL(64)
168 if (!be_quiet && !found_textrel) printf("------- ");
169 } 196 }
170 197
171 /* rpath fun */ 198 if (be_quiet)
172 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 199 return NULL;
173 if (show_rpath) { 200 else
201 return " - ";
202}
203static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
204{
205 /* TODO: when checking RPATH entries, check each subpath (between :) in ld.so.conf */
206 unsigned long i, s;
174 char *rpath, *runpath; 207 char *rpath, *runpath, **r;
208 void *strtbl_void;
209
210 if (!show_rpath) return;
211
175 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 212 strtbl_void = elf_findsecbyname(elf, ".dynstr");
176 rpath = runpath = NULL; 213 rpath = runpath = NULL;
177 214
178 if (strtbl_void) { 215 if (elf->phdr && strtbl_void) {
179#define SHOW_RPATH(B) \ 216#define SHOW_RPATH(B) \
180 if (elf->elf_class == ELFCLASS ## B) { \ 217 if (elf->elf_class == ELFCLASS ## B) { \
181 Elf ## B ## _Dyn *dyn; \ 218 Elf ## B ## _Dyn *dyn; \
182 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 219 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
183 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 220 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
184 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 221 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
222 Elf ## B ## _Off offset; \
223 Elf ## B ## _Xword word; \
224 /* Scan all the program headers */ \
185 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 225 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
226 /* Just scan dynamic headers */ \
186 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 227 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
228 offset = EGET(phdr[i].p_offset); \
229 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
230 /* Just scan dynamic RPATH/RUNPATH headers */ \
187 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 231 dyn = DYN ## B (elf->data + offset); \
188 while (EGET(dyn->d_tag) != DT_NULL) { \ 232 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
189 if (EGET(dyn->d_tag) == DT_RPATH) { \ 233 if (word == DT_RPATH) { \
234 r = &rpath; \
235 } else if (word == DT_RUNPATH) { \
236 r = &runpath; \
237 } else { \
238 ++dyn; \
239 continue; \
240 } \
241 /* Verify the memory is somewhat sane */ \
190 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 242 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
243 if (offset < elf->len) { \
244 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
245 *r = (char*)(elf->data + offset); \
246 /* If quiet, don't output paths in ld.so.conf */ \
247 if (be_quiet) \
248 for (s = 0; ldpaths[s]; ++s) \
249 if (!strcmp(ldpaths[s], *r)) { \
250 *r = NULL; \
251 break; \
252 } \
191 found_rpath = 1; \ 253 if (*r) *found_rpath = 1; \
192 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
193 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
194 found_rpath = 1; \
195 } \ 254 } \
196 ++dyn; \ 255 ++dyn; \
197 } \ 256 } \
198 } } 257 } }
199 SHOW_RPATH(32) 258 SHOW_RPATH(32)
200 SHOW_RPATH(64) 259 SHOW_RPATH(64)
201 } 260 }
261
202 if (rpath && runpath) { 262 if (rpath && runpath) {
203 if (!strcmp(rpath, runpath)) 263 if (!strcmp(rpath, runpath)) {
204 printf("%-5s ", runpath); 264 xstrcat(ret, runpath, ret_len);
205 else { 265 } else {
206 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 266 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
207 printf("{%s,%s} ", rpath, runpath); 267 xchrcat(ret, '{', ret_len);
268 xstrcat(ret, rpath, ret_len);
269 xchrcat(ret, ',', ret_len);
270 xstrcat(ret, runpath, ret_len);
271 xchrcat(ret, '}', ret_len);
208 } 272 }
209 } else if (rpath || runpath) 273 } else if (rpath || runpath)
210 printf("%-5s ", (runpath ? runpath : rpath)); 274 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
211 else if (!be_quiet && !found_rpath) 275 else if (!be_quiet)
212 printf(" - "); 276 xstrcat(ret, " - ", ret_len);
277}
278static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
279{
280 unsigned long i;
281 char *needed;
282 void *strtbl_void;
283
284 if (!show_needed) return;
285
286 strtbl_void = elf_findsecbyname(elf, ".dynstr");
287
288 if (elf->phdr && strtbl_void) {
289#define SHOW_NEEDED(B) \
290 if (elf->elf_class == ELFCLASS ## B) { \
291 Elf ## B ## _Dyn *dyn; \
292 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
293 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
294 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
295 Elf ## B ## _Off offset; \
296 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
297 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
298 offset = EGET(phdr[i].p_offset); \
299 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
300 dyn = DYN ## B (elf->data + offset); \
301 while (EGET(dyn->d_tag) != DT_NULL) { \
302 if (EGET(dyn->d_tag) == DT_NEEDED) { \
303 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
304 if (offset >= elf->len) { \
305 ++dyn; \
306 continue; \
307 } \
308 needed = (char*)(elf->data + offset); \
309 if (*found_needed) xchrcat(ret, ',', ret_len); \
310 xstrcat(ret, needed, ret_len); \
311 *found_needed = 1; \
312 } \
313 ++dyn; \
314 } \
315 } }
316 SHOW_NEEDED(32)
317 SHOW_NEEDED(64)
318 }
319}
320static char *scanelf_file_interp(elfobj *elf, char *found_interp)
321{
322 void *strtbl_void;
323
324 if (!show_interp) return NULL;
325
326 strtbl_void = elf_findsecbyname(elf, ".interp");
327
328 if (strtbl_void) {
329#define SHOW_INTERP(B) \
330 if (elf->elf_class == ELFCLASS ## B) { \
331 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
332 *found_interp = 1; \
333 return elf->data + EGET(strtbl->sh_offset); \
213 } 334 }
335 SHOW_INTERP(32)
336 SHOW_INTERP(64)
337 }
338 return NULL;
339}
340static char *scanelf_file_bind(elfobj *elf, char *found_bind)
341{
342 unsigned long i;
343 struct stat s;
214 344
215 if (find_sym) { 345 if (!show_bind) return NULL;
346 if (!elf->phdr) return NULL;
347
348#define SHOW_BIND(B) \
349 if (elf->elf_class == ELFCLASS ## B) { \
350 Elf ## B ## _Dyn *dyn; \
351 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
352 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
353 Elf ## B ## _Off offset; \
354 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
355 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
356 offset = EGET(phdr[i].p_offset); \
357 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
358 dyn = DYN ## B (elf->data + offset); \
359 while (EGET(dyn->d_tag) != DT_NULL) { \
360 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
361 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
362 { \
363 if (be_quiet) return NULL; \
364 *found_bind = 1; \
365 return "NOW"; \
366 } \
367 ++dyn; \
368 } \
369 } \
370 }
371 SHOW_BIND(32)
372 SHOW_BIND(64)
373
374 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
375 return NULL;
376 } else {
377 *found_bind = 1;
378 return "LAZY";
379 }
380}
381static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
382{
383 unsigned long i;
216 void *symtab_void, *strtab_void; 384 void *symtab_void, *strtab_void;
217 char *versioned_symname = malloc(strlen(find_sym)+2);
218 385
219 sprintf(versioned_symname, "%s@", find_sym); 386 if (!find_sym) return NULL;
387
220 symtab_void = elf_findsecbyname(elf, ".symtab"); 388 symtab_void = elf_findsecbyname(elf, ".symtab");
221 strtab_void = elf_findsecbyname(elf, ".strtab"); 389 strtab_void = elf_findsecbyname(elf, ".strtab");
222 390
223 if (symtab_void && strtab_void) { 391 if (symtab_void && strtab_void) {
392 char *base, *basemem;
393 basemem = xstrdup(filename);
394 base = basename(basemem);
224#define FIND_SYM(B) \ 395#define FIND_SYM(B) \
225 if (elf->elf_class == ELFCLASS ## B) { \ 396 if (elf->elf_class == ELFCLASS ## B) { \
226 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 397 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
227 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 398 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
228 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 399 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
229 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 400 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
230 char *symname; \ 401 char *symname; \
231 for (i = 0; i < cnt; ++i) { \ 402 for (i = 0; i < cnt; ++i) { \
232 if (sym->st_name) { \ 403 if (sym->st_name) { \
233 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 404 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
234 if (*find_sym == '*') { \ 405 if (*find_sym == '*') { \
235 printf("%s(%s) %5lX %15s %s\n", ((found_sym == 0) ? "\n\t" : "\t"), \ 406 printf("%s(%s) %5lX %15s %s\n", \
236 (char *) basename(filename), \ 407 ((*found_sym == 0) ? "\n\t" : "\t"), \
237 (long)sym->st_size, (char *) get_elfstttype(sym->st_info & 0xF), \ 408 base, \
238 symname); \ 409 (long)sym->st_size, \
410 (char *)get_elfstttype(sym->st_info), \
411 symname); \
239 found_sym = 1; \ 412 *found_sym = 1; \
240 } \
241 if ((strcmp(find_sym, symname) == 0) || \ 413 } else if ((strcmp(find_sym, symname) == 0) || \
242 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) \ 414 (strcmp(symname, versioned_symname) == 0)) \
243 found_sym++; \ 415 (*found_sym)++; \
244 } \ 416 } \
245 ++sym; \ 417 ++sym; \
246 } } 418 } }
247 FIND_SYM(32) 419 FIND_SYM(32)
248 FIND_SYM(64) 420 FIND_SYM(64)
421 free(basemem);
422 }
423 if (*find_sym != '*' && *found_sym)
424 return find_sym;
425 if (be_quiet)
426 return NULL;
427 else
428 return " - ";
429}
430/* scan an elf file and show all the fun stuff */
431// #define prints(str) fputs(str, stdout)
432#define prints(str) write(fileno(stdout), str, strlen(str))
433static void scanelf_file(const char *filename)
434{
435 unsigned long i;
436 char found_pax, found_stack, found_relro, found_textrel,
437 found_rpath, found_needed, found_interp, found_bind,
438 found_sym, found_file;
439 elfobj *elf;
440 struct stat st;
441 static char *out_buffer = NULL;
442 static size_t out_len;
443
444 /* make sure 'filename' exists */
445 if (lstat(filename, &st) == -1) {
446 if (be_verbose > 2) printf("%s: does not exist\n", filename);
447 return;
448 }
449 /* always handle regular files and handle symlinked files if no -y */
450 if (S_ISLNK(st.st_mode)) {
451 if (!scan_symlink) return;
452 stat(filename, &st);
453 }
454 if (!S_ISREG(st.st_mode)) {
455 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
456 return;
457 }
458
459 found_pax = found_stack = found_relro = found_textrel = \
460 found_rpath = found_needed = found_interp = found_bind = \
461 found_sym = found_file = 0;
462
463 /* verify this is real ELF */
464 if ((elf = readelf(filename)) == NULL) {
465 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
466 return;
467 }
468
469 if (be_verbose > 1)
470 printf("%s: scanning file {%s,%s}\n", filename,
471 get_elfeitype(elf, EI_CLASS, elf->elf_class),
472 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
473 else if (be_verbose)
474 printf("%s: scanning file\n", filename);
475
476 /* init output buffer */
477 if (!out_buffer) {
478 out_len = sizeof(char) * 80;
479 out_buffer = (char*)xmalloc(out_len);
480 }
481 *out_buffer = '\0';
482
483 /* show the header */
484 if (!be_quiet && show_banner) {
485 for (i = 0; out_format[i]; ++i) {
486 if (out_format[i] != '%') continue;
487
488 switch (out_format[++i]) {
489 case '%': break;
490 case 'F': prints("FILE "); found_file = 1; break;
491 case 'o': prints(" TYPE "); break;
492 case 'x': prints(" PAX "); break;
493 case 'e': prints("STK/REL "); break;
494 case 't': prints("TEXTREL "); break;
495 case 'r': prints("RPATH "); break;
496 case 'n': prints("NEEDED "); break;
497 case 'i': prints("INTERP "); break;
498 case 'b': prints("BIND "); break;
499 case 's': prints("SYM "); break;
249 } 500 }
250 free(versioned_symname);
251 if (*find_sym != '*') {
252 if (found_sym)
253 printf(" %s ", find_sym);
254 else if (!be_quiet)
255 printf(" - ");
256 }
257 } 501 }
502 if (!found_file) prints("FILE ");
503 prints("\n");
504 found_file = 0;
505 show_banner = 0;
506 }
258 507
508 /* dump all the good stuff */
509 for (i = 0; out_format[i]; ++i) {
510 const char *out;
511
512 /* make sure we trim leading spaces in quiet mode */
513 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
514 *out_buffer = '\0';
515
516 if (out_format[i] != '%') {
517 xchrcat(&out_buffer, out_format[i], &out_len);
518 continue;
519 }
520
521 out = NULL;
522 switch (out_format[++i]) {
523 case '%': xchrcat(&out_buffer, '%', &out_len); break;
524 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
525 case 'o': out = get_elfetype(elf); break;
526 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
527 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
528 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
529 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
530 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
531 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
532 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
533 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
534 }
535 if (out) xstrcat(&out_buffer, out, &out_len);
536 }
537
538#define FOUND_SOMETHING() \
259 if (!be_quiet || found_pax || found_stack || found_textrel || found_rpath || found_sym) 539 (found_pax || found_stack || found_textrel || found_rpath || \
260 printf("%s\n", filename); 540 found_needed || found_interp || found_bind || found_sym)
541
542 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
543 xchrcat(&out_buffer, ' ', &out_len);
544 xstrcat(&out_buffer, filename, &out_len);
545 }
546 if (!be_quiet || (be_quiet && FOUND_SOMETHING()))
547 puts(out_buffer);
261 548
262 unreadelf(elf); 549 unreadelf(elf);
263} 550}
264 551
265/* scan a directory for ET_EXEC files and print when we find one */ 552/* scan a directory for ET_EXEC files and print when we find one */
267{ 554{
268 register DIR *dir; 555 register DIR *dir;
269 register struct dirent *dentry; 556 register struct dirent *dentry;
270 struct stat st_top, st; 557 struct stat st_top, st;
271 char buf[_POSIX_PATH_MAX]; 558 char buf[_POSIX_PATH_MAX];
272 size_t len = 0; 559 size_t pathlen = 0, len = 0;
273 560
274 /* make sure path exists */ 561 /* make sure path exists */
275 if (lstat(path, &st_top) == -1) 562 if (lstat(path, &st_top) == -1) {
563 if (be_verbose > 2) printf("%s: does not exist\n", path);
276 return; 564 return;
565 }
277 566
278 /* ok, if it isn't a directory, assume we can open it */ 567 /* ok, if it isn't a directory, assume we can open it */
279 if (!S_ISDIR(st_top.st_mode)) { 568 if (!S_ISDIR(st_top.st_mode)) {
280 scanelf_file(path); 569 scanelf_file(path);
281 return; 570 return;
286 warnf("could not opendir %s: %s", path, strerror(errno)); 575 warnf("could not opendir %s: %s", path, strerror(errno));
287 return; 576 return;
288 } 577 }
289 if (be_verbose) printf("%s: scanning dir\n", path); 578 if (be_verbose) printf("%s: scanning dir\n", path);
290 579
580 pathlen = strlen(path);
291 while ((dentry = readdir(dir))) { 581 while ((dentry = readdir(dir))) {
292 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 582 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
293 continue; 583 continue;
294 len = (strlen(path) + 2 + strlen(dentry->d_name)); 584 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
295 assert(len < sizeof(buf)); 585 if (len >= sizeof(buf)) {
296 strncpy(buf, path, len); 586 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
297 strncat(buf, "/", len); 587 continue;
298 strncat(buf, dentry->d_name, len); 588 }
299 buf[sizeof(buf)] = 0; 589 sprintf(buf, "%s/%s", path, dentry->d_name);
300 if (lstat(buf, &st) != -1) { 590 if (lstat(buf, &st) != -1) {
301 if (S_ISREG(st.st_mode)) 591 if (S_ISREG(st.st_mode))
302 scanelf_file(buf); 592 scanelf_file(buf);
303 else if (dir_recurse && S_ISDIR(st.st_mode)) { 593 else if (dir_recurse && S_ISDIR(st.st_mode)) {
304 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 594 if (dir_crossmount || (st_top.st_dev == st.st_dev))
307 } 597 }
308 } 598 }
309 closedir(dir); 599 closedir(dir);
310} 600}
311 601
602static int scanelf_from_file(char *filename)
603{
604 FILE *fp = NULL;
605 char *p;
606 char path[_POSIX_PATH_MAX];
607
608 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
609 fp = stdin;
610 else if ((fp = fopen(filename, "r")) == NULL)
611 return 1;
612
613 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
614 if ((p = strchr(path, '\n')) != NULL)
615 *p = 0;
616 scanelf_dir(path);
617 }
618 if (fp != stdin)
619 fclose(fp);
620 return 0;
621}
622
623static void load_ld_so_conf()
624{
625 FILE *fp = NULL;
626 char *p;
627 char path[_POSIX_PATH_MAX];
628 int i = 0;
629
630 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
631 return;
632
633 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
634 if (*path != '/')
635 continue;
636
637 if ((p = strrchr(path, '\r')) != NULL)
638 *p = 0;
639 if ((p = strchr(path, '\n')) != NULL)
640 *p = 0;
641
642 ldpaths[i++] = xstrdup(path);
643
644 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
645 break;
646 }
647 ldpaths[i] = NULL;
648
649 fclose(fp);
650}
651
312/* scan /etc/ld.so.conf for paths */ 652/* scan /etc/ld.so.conf for paths */
313static void scanelf_ldpath() 653static void scanelf_ldpath()
314{ 654{
315 char scan_l, scan_ul, scan_ull; 655 char scan_l, scan_ul, scan_ull;
316 char *path, *p; 656 int i = 0;
317 FILE *fp;
318 657
319 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 658 if (!ldpaths[0])
320 err("Unable to open ld.so.conf: %s", strerror(errno)); 659 err("Unable to load any paths from ld.so.conf");
321 660
322 scan_l = scan_ul = scan_ull = 0; 661 scan_l = scan_ul = scan_ull = 0;
323 662
324 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) { 663 while (ldpaths[i]) {
325 warn("Can not malloc() memory for ldpath scanning");
326 return;
327 }
328 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
329 if (*path == '/') {
330 if ((p = strrchr(path, '\r')) != NULL)
331 *p = 0;
332 if ((p = strrchr(path, '\n')) != NULL)
333 *p = 0;
334 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1; 664 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
335 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 665 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
336 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 666 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
337 scanelf_dir(path); 667 scanelf_dir(ldpaths[i]);
668 ++i;
338 } 669 }
339 free(path);
340 670
341 if (!scan_l) scanelf_dir("/lib"); 671 if (!scan_l) scanelf_dir("/lib");
342 if (!scan_ul) scanelf_dir("/usr/lib"); 672 if (!scan_ul) scanelf_dir("/usr/lib");
343 if (!scan_ull) scanelf_dir("/usr/local/lib"); 673 if (!scan_ull) scanelf_dir("/usr/local/lib");
344
345 fclose(fp);
346} 674}
347 675
348/* scan env PATH for paths */ 676/* scan env PATH for paths */
349static void scanelf_envpath() 677static void scanelf_envpath()
350{ 678{
351 char *path, *p; 679 char *path, *p;
352 680
353 path = getenv("PATH"); 681 path = getenv("PATH");
354 if (!path) 682 if (!path)
355 err("PATH is not set in your env !"); 683 err("PATH is not set in your env !");
356 684 path = xstrdup(path);
357 if ((path = strdup(path)) == NULL)
358 err("stdup failed: %s", strerror(errno));
359 685
360 while ((p = strrchr(path, ':')) != NULL) { 686 while ((p = strrchr(path, ':')) != NULL) {
361 scanelf_dir(p + 1); 687 scanelf_dir(p + 1);
362 *p = 0; 688 *p = 0;
363 } 689 }
366} 692}
367 693
368 694
369 695
370/* usage / invocation handling functions */ 696/* usage / invocation handling functions */
371#define PARSE_FLAGS "plRmxetrs:aqvo:BhV" 697#define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV"
372#define a_argument required_argument 698#define a_argument required_argument
373static struct option const long_opts[] = { 699static struct option const long_opts[] = {
374 {"path", no_argument, NULL, 'p'}, 700 {"path", no_argument, NULL, 'p'},
375 {"ldpath", no_argument, NULL, 'l'}, 701 {"ldpath", no_argument, NULL, 'l'},
376 {"recursive", no_argument, NULL, 'R'}, 702 {"recursive", no_argument, NULL, 'R'},
377 {"mount", no_argument, NULL, 'm'}, 703 {"mount", no_argument, NULL, 'm'},
704 {"symlink", no_argument, NULL, 'y'},
378 {"pax", no_argument, NULL, 'x'}, 705 {"pax", no_argument, NULL, 'x'},
379 {"header", no_argument, NULL, 'e'}, 706 {"header", no_argument, NULL, 'e'},
380 {"textrel", no_argument, NULL, 't'}, 707 {"textrel", no_argument, NULL, 't'},
381 {"rpath", no_argument, NULL, 'r'}, 708 {"rpath", no_argument, NULL, 'r'},
709 {"needed", no_argument, NULL, 'n'},
710 {"interp", no_argument, NULL, 'i'},
711 {"bind", no_argument, NULL, 'b'},
382 {"symbol", a_argument, NULL, 's'}, 712 {"symbol", a_argument, NULL, 's'},
383 {"all", no_argument, NULL, 'a'}, 713 {"all", no_argument, NULL, 'a'},
384 {"quiet", no_argument, NULL, 'q'}, 714 {"quiet", no_argument, NULL, 'q'},
385 {"verbose", no_argument, NULL, 'v'}, 715 {"verbose", no_argument, NULL, 'v'},
716 {"format", a_argument, NULL, 'F'},
717 {"from", a_argument, NULL, 'f'},
386 {"file", a_argument, NULL, 'o'}, 718 {"file", a_argument, NULL, 'o'},
387 {"nobanner", no_argument, NULL, 'B'}, 719 {"nobanner", no_argument, NULL, 'B'},
388 {"help", no_argument, NULL, 'h'}, 720 {"help", no_argument, NULL, 'h'},
389 {"version", no_argument, NULL, 'V'}, 721 {"version", no_argument, NULL, 'V'},
390 {NULL, no_argument, NULL, 0x0} 722 {NULL, no_argument, NULL, 0x0}
391}; 723};
724
392static char *opts_help[] = { 725static char *opts_help[] = {
393 "Scan all directories in PATH environment", 726 "Scan all directories in PATH environment",
394 "Scan all directories in /etc/ld.so.conf", 727 "Scan all directories in /etc/ld.so.conf",
395 "Scan directories recursively", 728 "Scan directories recursively",
396 "Don't recursively cross mount points\n", 729 "Don't recursively cross mount points",
730 "Don't scan symlinks\n",
397 "Print PaX markings", 731 "Print PaX markings",
398 "Print GNU_STACK markings", 732 "Print GNU_STACK markings",
399 "Print TEXTREL information", 733 "Print TEXTREL information",
400 "Print RPATH information", 734 "Print RPATH information",
735 "Print NEEDED information",
736 "Print INTERP information",
737 "Print BIND information",
401 "Find a specified symbol", 738 "Find a specified symbol",
402 "Print all scanned info (-x -e -t -r)\n", 739 "Print all scanned info (-x -e -t -r -n -i -b)\n",
403 "Only output 'bad' things", 740 "Only output 'bad' things",
404 "Be verbose (can be specified more than once)", 741 "Be verbose (can be specified more than once)",
742 "Use specified format for output",
743 "Read input stream from a filename",
405 "Write output stream to a filename", 744 "Write output stream to a filename",
406 "Don't display the header", 745 "Don't display the header",
407 "Print this help and exit", 746 "Print this help and exit",
408 "Print version and exit", 747 "Print version and exit",
409 NULL 748 NULL
410}; 749};
411 750
412/* display usage and exit */ 751/* display usage and exit */
413static void usage(int status) 752static void usage(int status)
414{ 753{
415 int i; 754 unsigned long i;
416 printf(" Scan ELF binaries for stuff\n" 755 printf("* Scan ELF binaries for stuff\n\n"
417 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 756 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
418 printf("Options:\n"); 757 printf("Options: -[%s]\n", PARSE_FLAGS);
419 for (i = 0; long_opts[i].name; ++i) 758 for (i = 0; long_opts[i].name; ++i)
420 if (long_opts[i].has_arg == no_argument) 759 if (long_opts[i].has_arg == no_argument)
421 printf(" -%c, --%-13s %s\n", long_opts[i].val, 760 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
422 long_opts[i].name, opts_help[i]); 761 long_opts[i].name, opts_help[i]);
423 else 762 else
424 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 763 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
425 long_opts[i].name, opts_help[i]); 764 long_opts[i].name, opts_help[i]);
765
766 if (status != EXIT_SUCCESS)
767 exit(status);
768
769 puts("\nThe format modifiers for the -F option are:");
770 puts(" %F Filename \t%x PaX Flags \t%e STACK/RELRO");
771 puts(" %t TEXTREL \t%r RPATH \t%n NEEDED");
772 puts(" %i INTERP \t%b BIND \t%s symbol");
773
426 exit(status); 774 exit(status);
427} 775}
428 776
429/* parse command line arguments and preform needed actions */ 777/* parse command line arguments and preform needed actions */
430static void parseargs(int argc, char *argv[]) 778static void parseargs(int argc, char *argv[])
431{ 779{
432 int flag; 780 int i;
781 char *from_file = NULL;
433 782
434 opterr = 0; 783 opterr = 0;
435 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 784 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
436 switch (flag) { 785 switch (i) {
437 786
438 case 'V': /* version info */ 787 case 'V':
439 printf("%s compiled %s\n%s\n" 788 printf("%s compiled %s\n%s\n"
440 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 789 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
441 __FILE__, __DATE__, rcsid, argv0); 790 __FILE__, __DATE__, rcsid, argv0);
442 exit(EXIT_SUCCESS); 791 exit(EXIT_SUCCESS);
443 break; 792 break;
444 case 'h': usage(EXIT_SUCCESS); break; 793 case 'h': usage(EXIT_SUCCESS); break;
445 794 case 'f':
795 if (from_file == NULL)
796 from_file = xstrdup(optarg);
797 break;
446 case 'o': { 798 case 'o': {
447 FILE *fp = NULL; 799 FILE *fp = NULL;
448 fp = freopen(optarg, "w", stdout); 800 fp = freopen(optarg, "w", stdout);
449 if (fp == NULL) 801 if (fp == NULL)
450 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 802 err("Could not open output stream '%s': %s", optarg, strerror(errno));
451 stdout = fp; 803 stdout = fp;
452 break; 804 break;
453 } 805 }
454 806
455 case 's': find_sym = strdup(optarg); break; 807 case 's': {
808 size_t len;
809 find_sym = xstrdup(optarg);
810 len = strlen(find_sym) + 1;
811 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
812 sprintf(versioned_symname, "%s@", find_sym);
813 break;
814 }
456 815
816 case 'F': {
817 if (!out_format)
818 out_format = xstrdup(optarg);
819 break;
820 }
821
822 case 'y': scan_symlink = 0; break;
457 case 'B': show_banner = 0; break; 823 case 'B': show_banner = 0; break;
458 case 'l': scan_ldpath = 1; break; 824 case 'l': scan_ldpath = 1; break;
459 case 'p': scan_envpath = 1; break; 825 case 'p': scan_envpath = 1; break;
460 case 'R': dir_recurse = 1; break; 826 case 'R': dir_recurse = 1; break;
461 case 'm': dir_crossmount = 0; break; 827 case 'm': dir_crossmount = 0; break;
462 case 'x': show_pax = 1; break; 828 case 'x': show_pax = 1; break;
463 case 'e': show_stack = 1; break; 829 case 'e': show_stack = 1; break;
464 case 't': show_textrel = 1; break; 830 case 't': show_textrel = 1; break;
465 case 'r': show_rpath = 1; break; 831 case 'r': show_rpath = 1; break;
832 case 'n': show_needed = 1; break;
833 case 'i': show_interp = 1; break;
834 case 'b': show_bind = 1; break;
466 case 'q': be_quiet = 1; break; 835 case 'q': be_quiet = 1; break;
467 case 'v': be_verbose = (be_verbose % 20) + 1; break; 836 case 'v': be_verbose = (be_verbose % 20) + 1; break;
468 case 'a': show_pax = show_stack = show_textrel = show_rpath = 1; break; 837 case 'a': show_pax = show_stack = show_textrel = show_rpath = \
838 show_needed = show_interp = show_bind = 1; break;
469 839
470 case ':': 840 case ':':
471 warn("Option missing parameter"); 841 err("Option missing parameter\n");
472 usage(EXIT_FAILURE);
473 break;
474 case '?': 842 case '?':
475 warn("Unknown option"); 843 err("Unknown option\n");
476 usage(EXIT_FAILURE);
477 break;
478 default: 844 default:
479 err("Unhandled option '%c'", flag); 845 err("Unhandled option '%c'", i);
480 break; 846 }
847 }
848
849 /* let the format option override all other options */
850 if (out_format) {
851 show_pax = show_stack = show_textrel = show_rpath = \
852 show_needed = show_interp = show_bind = 0;
853 for (i = 0; out_format[i]; ++i) {
854 if (out_format[i] != '%') continue;
855
856 switch (out_format[++i]) {
857 case '%': break;
858 case 'F': break;
859 case 's': break;
860 case 'o': break;
861 case 'x': show_pax = 1; break;
862 case 'e': show_stack = 1; break;
863 case 't': show_textrel = 1; break;
864 case 'r': show_rpath = 1; break;
865 case 'n': show_needed = 1; break;
866 case 'i': show_interp = 1; break;
867 case 'b': show_bind = 1; break;
868 default:
869 err("Invalid format specifier '%c' (byte %i)",
870 out_format[i], i+1);
481 } 871 }
482 } 872 }
483 873
484 if (be_quiet && be_verbose) 874 /* construct our default format */
485 err("You can be quiet or you can be verbose, not both, stupid"); 875 } else {
876 size_t fmt_len = 30;
877 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
878 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
879 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
880 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
881 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
882 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
883 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
884 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
885 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
886 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
887 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
888 }
889 if (be_verbose > 2) printf("Format: %s\n", out_format);
486 890
891 /* now lets actually do the scanning */
892 if (scan_ldpath || (show_rpath && be_quiet))
893 load_ld_so_conf();
487 if (scan_ldpath) scanelf_ldpath(); 894 if (scan_ldpath) scanelf_ldpath();
488 if (scan_envpath) scanelf_envpath(); 895 if (scan_envpath) scanelf_envpath();
896 if (from_file) {
897 scanelf_from_file(from_file);
898 free(from_file);
899 from_file = *argv;
900 }
489 if (optind == argc && !scan_ldpath && !scan_envpath) 901 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
490 err("Nothing to scan !?"); 902 err("Nothing to scan !?");
491 while (optind < argc) 903 while (optind < argc)
492 scanelf_dir(argv[optind++]); 904 scanelf_dir(argv[optind++]);
493 905
494 if (find_sym) free(find_sym); 906 /* clean up */
907 if (find_sym) {
908 free(find_sym);
909 free(versioned_symname);
910 }
911 if (out_format) free(out_format);
912 for (i = 0; ldpaths[i]; ++i)
913 free(ldpaths[i]);
495} 914}
496 915
916
917
918/* utility funcs */
919static char *xstrdup(const char *s)
920{
921 char *ret = strdup(s);
922 if (!ret) err("Could not strdup(): %s", strerror(errno));
923 return ret;
924}
925
926static void *xmalloc(size_t size)
927{
928 void *ret = malloc(size);
929 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
930 return ret;
931}
932
933static void xstrcat(char **dst, const char *src, size_t *curr_len)
934{
935 long new_len;
936
937 new_len = strlen(*dst) + strlen(src);
938 if (*curr_len <= new_len) {
939 *curr_len = new_len + (*curr_len / 2);
940 *dst = realloc(*dst, *curr_len);
941 if (!*dst)
942 err("could not realloc %li bytes", (unsigned long)*curr_len);
943 }
944
945 strcat(*dst, src);
946}
947
948static inline void xchrcat(char **dst, const char append, size_t *curr_len)
949{
950 static char my_app[2];
951 my_app[0] = append;
952 my_app[1] = '\0';
953 xstrcat(dst, my_app, curr_len);
954}
497 955
498 956
499int main(int argc, char *argv[]) 957int main(int argc, char *argv[])
500{ 958{
501 if (argc < 2) 959 if (argc < 2)
502 usage(EXIT_FAILURE); 960 usage(EXIT_FAILURE);
503 parseargs(argc, argv); 961 parseargs(argc, argv);
504 fclose(stdout); 962 fclose(stdout);
963#ifdef __BOUNDS_CHECKING_ON
964 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
965#endif
505 return EXIT_SUCCESS; 966 return EXIT_SUCCESS;
506} 967}

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