/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.35 Revision 1.62
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 1.35 2005/04/14 00:17:30 solar Exp $ 5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.62 2005/05/29 06:25:48 vapier Exp $
6 * 6 *
7 ******************************************************************** 7 ********************************************************************
8 * This program is free software; you can redistribute it and/or 8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as 9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the 10 * published by the Free Software Foundation; either version 2 of the
22 */ 22 */
23 23
24#include <stdio.h> 24#include <stdio.h>
25#include <stdlib.h> 25#include <stdlib.h>
26#include <sys/types.h> 26#include <sys/types.h>
27#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 1.35 2005/04/14 00:17:30 solar Exp $"; 39static const char *rcsid = "$Id: scanelf.c,v 1.62 2005/05/29 06:25:48 vapier 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;
71static char show_needed = 0; 67static char show_needed = 0;
68static char show_interp = 0;
69static char show_bind = 0;
72static char show_banner = 1; 70static char show_banner = 1;
73static char be_quiet = 0; 71static char be_quiet = 0;
74static char be_verbose = 0; 72static char be_verbose = 0;
73static char *find_sym = NULL, *versioned_symname = NULL;
75static char *find_sym = NULL; 74static char *out_format = NULL;
76 75
77 76
78 77/* sub-funcs for scanelf_file() */
79/* scan an elf file and show all the fun stuff */ 78static char *scanelf_file_pax(elfobj *elf, char *found_pax)
80static void scanelf_file(const char *filename)
81{ 79{
82 int i; 80 static char *paxflags;
83 char found_pax, found_stack, found_relro, found_textrel, 81 static char ret[7];
84 found_rpath, found_needed, found_sym; 82 unsigned long i, shown;
85 elfobj *elf;
86 struct stat st;
87 83
88 /* make sure path exists */
89 if (lstat(filename, &st) == -1)
90 return;
91 if (!S_ISREG(st.st_mode))
92 return;
93 found_pax = found_stack = found_relro = found_textrel = \
94 found_rpath = found_needed = found_sym = 0;
95 84
96 /* verify this is real ELF */ 85 if (!show_pax) return NULL;
97 if ((elf = readelf(filename)) == NULL) {
98 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
99 return;
100 }
101 86
102 if (be_verbose > 1)
103 printf("%s: {%s,%s} scanning file\n", filename,
104 get_elfeitype(elf, EI_CLASS, elf->elf_class),
105 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
106 else if (be_verbose)
107 printf("%s: scanning file\n", filename);
108
109 /* show the header */
110 if (!be_quiet && show_banner) {
111 printf(" TYPE ");
112 if (show_pax) printf(" PAX ");
113 if (show_stack) printf("STK/REL ");
114 if (show_textrel) printf("TEXTREL ");
115 if (show_rpath) printf("RPATH ");
116 if (show_needed) printf("NEEDED ");
117 printf(" FILE\n");
118 show_banner = 0; 87 shown = 0;
119 } 88 memset(&ret, 0, sizeof(ret));
120 89
121 /* dump all the good stuff */ 90 if (elf->phdr) {
122 if (!be_quiet) 91#define SHOW_PAX(B) \
123 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 }
124 109
125 if (show_pax) { 110 /* fall back to EI_PAX if no PT_PAX was found */
111 if (!*ret) {
126 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); 112 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
127 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { 113 if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
128 found_pax = 1; 114 *found_pax = 1;
129 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf))); 115 return paxflags;
130 }
131 } 116 }
117 strncpy(ret, paxflags, sizeof(ret));
118 // ++shown;
119 }
132 120
133 /* stack fun */ 121 if (be_quiet && !shown)
134 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) {
135#define SHOW_STACK(B) \ 137#define SHOW_STACK(B) \
136 if (elf->elf_class == ELFCLASS ## B) { \ 138 if (elf->elf_class == ELFCLASS ## B) { \
137 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 139 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
138 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 140 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
139 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 141 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
140 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 142 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
141 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; \
142 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 150 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
143 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++) { \
144 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \ 181 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
145 found_stack = 1; \ 182 offset = EGET(phdr[i].p_offset); \
146 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)*/ \
147 found_relro = 1; \ 187 *found_textrel = 1; \
148 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; \
149 } \ 192 } \
150 }
151 SHOW_STACK(32)
152 SHOW_STACK(64)
153 if (!be_quiet && !found_stack) printf("--- ");
154 if (!be_quiet && !found_relro) printf("--- ");
155 }
156
157 /* textrel fun */
158 if (show_textrel) {
159#define SHOW_TEXTREL(B) \
160 if (elf->elf_class == ELFCLASS ## B) { \
161 Elf ## B ## _Dyn *dyn; \
162 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
163 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
164 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
165 if (phdr[i].p_type != PT_DYNAMIC) continue; \
166 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
167 while (EGET(dyn->d_tag) != DT_NULL) { \
168 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
169 found_textrel = 1; \
170 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
171 fputs("TEXTREL ", stdout); \
172 } \
173 ++dyn; \
174 } \
175 } } 193 } }
176 SHOW_TEXTREL(32) 194 SHOW_TEXTREL(32)
177 SHOW_TEXTREL(64) 195 SHOW_TEXTREL(64)
178 if (!be_quiet && !found_textrel) fputs("------- ", stdout);
179 } 196 }
180 197
181 /* rpath fun */ 198 if (be_quiet)
182 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 199 return NULL;
183 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;
184 char *rpath, *runpath; 207 char *rpath, *runpath, **r;
208 void *strtbl_void;
209
210 if (!show_rpath) return;
211
185 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 212 strtbl_void = elf_findsecbyname(elf, ".dynstr");
186 rpath = runpath = NULL; 213 rpath = runpath = NULL;
187 214
188 if (strtbl_void) { 215 if (elf->phdr && strtbl_void) {
189#define SHOW_RPATH(B) \ 216#define SHOW_RPATH(B) \
190 if (elf->elf_class == ELFCLASS ## B) { \ 217 if (elf->elf_class == ELFCLASS ## B) { \
191 Elf ## B ## _Dyn *dyn; \ 218 Elf ## B ## _Dyn *dyn; \
192 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 219 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
193 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 220 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
194 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 */ \
195 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 225 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
226 /* Just scan dynamic headers */ \
196 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 */ \
197 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 231 dyn = DYN ## B (elf->data + offset); \
198 while (EGET(dyn->d_tag) != DT_NULL) { \ 232 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
199 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 */ \
200 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 } \
201 found_rpath = 1; \ 253 if (*r) *found_rpath = 1; \
202 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
203 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 found_rpath = 1; \
205 } \ 254 } \
206 ++dyn; \ 255 ++dyn; \
207 } \ 256 } \
208 } } 257 } }
209 SHOW_RPATH(32) 258 SHOW_RPATH(32)
210 SHOW_RPATH(64) 259 SHOW_RPATH(64)
211 } 260 }
261
212 if (rpath && runpath) { 262 if (rpath && runpath) {
213 if (!strcmp(rpath, runpath)) 263 if (!strcmp(rpath, runpath)) {
214 printf("%-5s ", runpath); 264 xstrcat(ret, runpath, ret_len);
215 else { 265 } else {
216 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 266 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
217 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);
218 } 272 }
219 } else if (rpath || runpath) 273 } else if (rpath || runpath)
220 printf("%-5s ", (runpath ? runpath : rpath)); 274 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
221 else if (!be_quiet && !found_rpath) 275 else if (!be_quiet)
222 printf(" - "); 276 xstrcat(ret, " - ", ret_len);
223 } 277}
224 278static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
225 /* print out all the NEEDED entries */ 279{
226 if (show_needed) { 280 unsigned long i;
227 char *needed; 281 char *needed;
282 void *strtbl_void;
283
284 if (!show_needed) return;
285
228 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 286 strtbl_void = elf_findsecbyname(elf, ".dynstr");
229 287
230 if (strtbl_void) { 288 if (elf->phdr && strtbl_void) {
231#define SHOW_NEEDED(B) \ 289#define SHOW_NEEDED(B) \
232 if (elf->elf_class == ELFCLASS ## B) { \ 290 if (elf->elf_class == ELFCLASS ## B) { \
233 Elf ## B ## _Dyn *dyn; \ 291 Elf ## B ## _Dyn *dyn; \
234 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 292 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 293 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
236 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 294 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
295 Elf ## B ## _Off offset; \
237 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 296 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
238 if (be_verbose && EGET(phdr[i].p_type) == PT_INTERP) { \
239 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
240 printf("%s\n", elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr)); \
241 exit(0); \
242 } \
243 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 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; \
244 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 300 dyn = DYN ## B (elf->data + offset); \
245 while (EGET(dyn->d_tag) != DT_NULL) { \ 301 while (EGET(dyn->d_tag) != DT_NULL) { \
246 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 302 if (EGET(dyn->d_tag) == DT_NEEDED) { \
247 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 303 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
248 if (found_needed) printf(","); \ 304 if (offset >= elf->len) { \
249 printf("%s", needed); \ 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); \
250 found_needed = 1; \ 311 *found_needed = 1; \
251 } \ 312 } \
252 ++dyn; \ 313 ++dyn; \
253 } \ 314 } \
254 } } 315 } }
255 SHOW_NEEDED(32) 316 SHOW_NEEDED(32)
256 SHOW_NEEDED(64) 317 SHOW_NEEDED(64)
257 } 318 }
258 if (!be_quiet && !found_needed) 319}
259 printf(" - "); 320static char *scanelf_file_interp(elfobj *elf, char *found_interp)
260 else if (found_needed) 321{
261 printf(" "); 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); \
262 } 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;
263 344
264 /* search the symbol table for a specified symbol */ 345 if (!show_bind) return NULL;
265 if (find_sym) { 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;
266 void *symtab_void, *strtab_void; 384 void *symtab_void, *strtab_void;
267 char *versioned_symname;
268 size_t len;
269 385
270 len = strlen(find_sym) + 1; 386 if (!find_sym) return NULL;
271 versioned_symname = (char *)malloc(sizeof(char) * (len+1));
272 if (!versioned_symname) {
273 warnf("Could not malloc() mem for sym scan");
274 return;
275 }
276 sprintf(versioned_symname, "%s@", find_sym);
277 387
278 symtab_void = elf_findsecbyname(elf, ".symtab"); 388 symtab_void = elf_findsecbyname(elf, ".symtab");
279 strtab_void = elf_findsecbyname(elf, ".strtab"); 389 strtab_void = elf_findsecbyname(elf, ".strtab");
280 390
281 if (symtab_void && strtab_void) { 391 if (symtab_void && strtab_void) {
392 char *base, *basemem;
393 basemem = xstrdup(filename);
394 base = basename(basemem);
282#define FIND_SYM(B) \ 395#define FIND_SYM(B) \
283 if (elf->elf_class == ELFCLASS ## B) { \ 396 if (elf->elf_class == ELFCLASS ## B) { \
284 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 397 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
285 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 398 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
286 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)); \
287 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 400 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
288 char *symname; \ 401 char *symname; \
289 for (i = 0; i < cnt; ++i) { \ 402 for (i = 0; i < cnt; ++i) { \
290 if (sym->st_name) { \ 403 if (sym->st_name) { \
291 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)); \
292 if (*find_sym == '*') { \ 405 if (*find_sym == '*') { \
293 printf("%s(%s) %5lX %15s %s\n", \ 406 printf("%s(%s) %5lX %15s %s\n", \
294 ((found_sym == 0) ? "\n\t" : "\t"), \ 407 ((*found_sym == 0) ? "\n\t" : "\t"), \
295 (char *)basename(filename), \ 408 base, \
296 (long)sym->st_size, \ 409 (long)sym->st_size, \
297 (char *)get_elfstttype(sym->st_info), \ 410 (char *)get_elfstttype(sym->st_info), \
298 symname); \ 411 symname); \
299 found_sym = 1; \ 412 *found_sym = 1; \
300 } else if ((strcmp(find_sym, symname) == 0) || \ 413 } else if ((strcmp(find_sym, symname) == 0) || \
301 (strncmp(symname, versioned_symname, len) == 0)) \ 414 (strcmp(symname, versioned_symname) == 0)) \
302 found_sym++; \ 415 (*found_sym)++; \
303 } \ 416 } \
304 ++sym; \ 417 ++sym; \
305 } } 418 } }
306 FIND_SYM(32) 419 FIND_SYM(32)
307 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;
308 } 500 }
309 free(versioned_symname);
310 if (*find_sym != '*') {
311 if (found_sym)
312 printf(" %s ", find_sym);
313 else if (!be_quiet)
314 fputs(" - ", stdout);
315 }
316 } 501 }
502 if (!found_file) prints("FILE ");
503 prints("\n");
504 found_file = 0;
505 show_banner = 0;
506 }
317 507
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() \
318 if (!be_quiet || found_pax || found_stack || found_textrel || \ 539 (found_pax || found_stack || found_textrel || found_rpath || \
319 found_rpath || found_needed || found_sym) 540 found_needed || found_interp || found_bind || found_sym)
320 puts(filename); 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);
321 548
322 unreadelf(elf); 549 unreadelf(elf);
323} 550}
324 551
325/* 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 */
330 struct stat st_top, st; 557 struct stat st_top, st;
331 char buf[_POSIX_PATH_MAX]; 558 char buf[_POSIX_PATH_MAX];
332 size_t pathlen = 0, len = 0; 559 size_t pathlen = 0, len = 0;
333 560
334 /* make sure path exists */ 561 /* make sure path exists */
335 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);
336 return; 564 return;
565 }
337 566
338 /* 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 */
339 if (!S_ISDIR(st_top.st_mode)) { 568 if (!S_ISDIR(st_top.st_mode)) {
340 scanelf_file(path); 569 scanelf_file(path);
341 return; 570 return;
368 } 597 }
369 } 598 }
370 closedir(dir); 599 closedir(dir);
371} 600}
372 601
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
373/* scan /etc/ld.so.conf for paths */ 652/* scan /etc/ld.so.conf for paths */
374static void scanelf_ldpath() 653static void scanelf_ldpath()
375{ 654{
376 char scan_l, scan_ul, scan_ull; 655 char scan_l, scan_ul, scan_ull;
377 char *path, *p; 656 int i = 0;
378 FILE *fp;
379 657
380 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 658 if (!ldpaths[0])
381 err("Unable to open ld.so.conf: %s", strerror(errno)); 659 err("Unable to load any paths from ld.so.conf");
382 660
383 scan_l = scan_ul = scan_ull = 0; 661 scan_l = scan_ul = scan_ull = 0;
384 662
385 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) { 663 while (ldpaths[i]) {
386 warn("Can not malloc() memory for ldpath scanning");
387 return;
388 }
389 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
390 if (*path == '/') {
391 if ((p = strrchr(path, '\r')) != NULL)
392 *p = 0;
393 if ((p = strrchr(path, '\n')) != NULL)
394 *p = 0;
395 if (!scan_l && !strcmp(path, "/lib")) scan_l = 1; 664 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
396 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 665 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
397 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 666 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
398 scanelf_dir(path); 667 scanelf_dir(ldpaths[i]);
668 ++i;
399 } 669 }
400 free(path);
401 fclose(fp);
402 670
403 if (!scan_l) scanelf_dir("/lib"); 671 if (!scan_l) scanelf_dir("/lib");
404 if (!scan_ul) scanelf_dir("/usr/lib"); 672 if (!scan_ul) scanelf_dir("/usr/lib");
405 if (!scan_ull) scanelf_dir("/usr/local/lib"); 673 if (!scan_ull) scanelf_dir("/usr/local/lib");
406} 674}
411 char *path, *p; 679 char *path, *p;
412 680
413 path = getenv("PATH"); 681 path = getenv("PATH");
414 if (!path) 682 if (!path)
415 err("PATH is not set in your env !"); 683 err("PATH is not set in your env !");
416 684 path = xstrdup(path);
417 if ((path = strdup(path)) == NULL)
418 err("strdup failed: %s", strerror(errno));
419 685
420 while ((p = strrchr(path, ':')) != NULL) { 686 while ((p = strrchr(path, ':')) != NULL) {
421 scanelf_dir(p + 1); 687 scanelf_dir(p + 1);
422 *p = 0; 688 *p = 0;
423 } 689 }
426} 692}
427 693
428 694
429 695
430/* usage / invocation handling functions */ 696/* usage / invocation handling functions */
431#define PARSE_FLAGS "plRmxetrns:aqvo:BhV" 697#define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV"
432#define a_argument required_argument 698#define a_argument required_argument
433static struct option const long_opts[] = { 699static struct option const long_opts[] = {
434 {"path", no_argument, NULL, 'p'}, 700 {"path", no_argument, NULL, 'p'},
435 {"ldpath", no_argument, NULL, 'l'}, 701 {"ldpath", no_argument, NULL, 'l'},
436 {"recursive", no_argument, NULL, 'R'}, 702 {"recursive", no_argument, NULL, 'R'},
437 {"mount", no_argument, NULL, 'm'}, 703 {"mount", no_argument, NULL, 'm'},
704 {"symlink", no_argument, NULL, 'y'},
438 {"pax", no_argument, NULL, 'x'}, 705 {"pax", no_argument, NULL, 'x'},
439 {"header", no_argument, NULL, 'e'}, 706 {"header", no_argument, NULL, 'e'},
440 {"textrel", no_argument, NULL, 't'}, 707 {"textrel", no_argument, NULL, 't'},
441 {"rpath", no_argument, NULL, 'r'}, 708 {"rpath", no_argument, NULL, 'r'},
442 {"needed", no_argument, NULL, 'n'}, 709 {"needed", no_argument, NULL, 'n'},
710 {"interp", no_argument, NULL, 'i'},
711 {"bind", no_argument, NULL, 'b'},
443 {"symbol", a_argument, NULL, 's'}, 712 {"symbol", a_argument, NULL, 's'},
444 {"all", no_argument, NULL, 'a'}, 713 {"all", no_argument, NULL, 'a'},
445 {"quiet", no_argument, NULL, 'q'}, 714 {"quiet", no_argument, NULL, 'q'},
446 {"verbose", no_argument, NULL, 'v'}, 715 {"verbose", no_argument, NULL, 'v'},
716 {"format", a_argument, NULL, 'F'},
717 {"from", a_argument, NULL, 'f'},
447 {"file", a_argument, NULL, 'o'}, 718 {"file", a_argument, NULL, 'o'},
448 {"nobanner", no_argument, NULL, 'B'}, 719 {"nobanner", no_argument, NULL, 'B'},
449 {"help", no_argument, NULL, 'h'}, 720 {"help", no_argument, NULL, 'h'},
450 {"version", no_argument, NULL, 'V'}, 721 {"version", no_argument, NULL, 'V'},
451 {NULL, no_argument, NULL, 0x0} 722 {NULL, no_argument, NULL, 0x0}
452}; 723};
724
453static char *opts_help[] = { 725static char *opts_help[] = {
454 "Scan all directories in PATH environment", 726 "Scan all directories in PATH environment",
455 "Scan all directories in /etc/ld.so.conf", 727 "Scan all directories in /etc/ld.so.conf",
456 "Scan directories recursively", 728 "Scan directories recursively",
457 "Don't recursively cross mount points\n", 729 "Don't recursively cross mount points",
730 "Don't scan symlinks\n",
458 "Print PaX markings", 731 "Print PaX markings",
459 "Print GNU_STACK markings", 732 "Print GNU_STACK markings",
460 "Print TEXTREL information", 733 "Print TEXTREL information",
461 "Print RPATH information", 734 "Print RPATH information",
462 "Print NEEDED information", 735 "Print NEEDED information",
736 "Print INTERP information",
737 "Print BIND information",
463 "Find a specified symbol", 738 "Find a specified symbol",
464 "Print all scanned info (-x -e -t -r)\n", 739 "Print all scanned info (-x -e -t -r -n -i -b)\n",
465 "Only output 'bad' things", 740 "Only output 'bad' things",
466 "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",
467 "Write output stream to a filename", 744 "Write output stream to a filename",
468 "Don't display the header", 745 "Don't display the header",
469 "Print this help and exit", 746 "Print this help and exit",
470 "Print version and exit", 747 "Print version and exit",
471 NULL 748 NULL
472}; 749};
473 750
474/* display usage and exit */ 751/* display usage and exit */
475static void usage(int status) 752static void usage(int status)
476{ 753{
477 int i; 754 unsigned long i;
478 printf(" Scan ELF binaries for stuff\n" 755 printf("* Scan ELF binaries for stuff\n\n"
479 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 756 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
480 printf("Options: -[%s]\n", PARSE_FLAGS); 757 printf("Options: -[%s]\n", PARSE_FLAGS);
481 for (i = 0; long_opts[i].name; ++i) 758 for (i = 0; long_opts[i].name; ++i)
482 if (long_opts[i].has_arg == no_argument) 759 if (long_opts[i].has_arg == no_argument)
483 printf(" -%c, --%-13s %s\n", long_opts[i].val, 760 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
484 long_opts[i].name, opts_help[i]); 761 long_opts[i].name, opts_help[i]);
485 else 762 else
486 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 763 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
487 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
488 exit(status); 774 exit(status);
489} 775}
490 776
491/* parse command line arguments and preform needed actions */ 777/* parse command line arguments and preform needed actions */
492static void parseargs(int argc, char *argv[]) 778static void parseargs(int argc, char *argv[])
493{ 779{
494 int flag; 780 int i;
781 char *from_file = NULL;
495 782
496 opterr = 0; 783 opterr = 0;
497 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) {
498 switch (flag) { 785 switch (i) {
499 786
500 case 'V': /* version info */ 787 case 'V':
501 printf("%s compiled %s\n%s\n" 788 printf("%s compiled %s\n%s\n"
502 "%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",
503 __FILE__, __DATE__, rcsid, argv0); 790 __FILE__, __DATE__, rcsid, argv0);
504 exit(EXIT_SUCCESS); 791 exit(EXIT_SUCCESS);
505 break; 792 break;
506 case 'h': usage(EXIT_SUCCESS); break; 793 case 'h': usage(EXIT_SUCCESS); break;
507 794 case 'f':
795 if (from_file == NULL)
796 from_file = xstrdup(optarg);
797 else
798 err("Don't specify -f twice");
799 break;
508 case 'o': { 800 case 'o': {
509 FILE *fp = NULL; 801 FILE *fp = NULL;
510 fp = freopen(optarg, "w", stdout); 802 fp = freopen(optarg, "w", stdout);
511 if (fp == NULL) 803 if (fp == NULL)
512 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 804 err("Could not open output stream '%s': %s", optarg, strerror(errno));
513 stdout = fp; 805 stdout = fp;
514 break; 806 break;
515 } 807 }
516 808
517 case 's': find_sym = strdup(optarg); break; 809 case 's': {
810 size_t len;
811 if (!find_sym)
812 err("Don't specify -s twice");
813 find_sym = xstrdup(optarg);
814 len = strlen(find_sym) + 1;
815 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
816 sprintf(versioned_symname, "%s@", find_sym);
817 break;
818 }
518 819
820 case 'F': {
821 if (!out_format)
822 out_format = xstrdup(optarg);
823 else
824 err("Don't specify -F twice");
825 break;
826 }
827
828 case 'y': scan_symlink = 0; break;
519 case 'B': show_banner = 0; break; 829 case 'B': show_banner = 0; break;
520 case 'l': scan_ldpath = 1; break; 830 case 'l': scan_ldpath = 1; break;
521 case 'p': scan_envpath = 1; break; 831 case 'p': scan_envpath = 1; break;
522 case 'R': dir_recurse = 1; break; 832 case 'R': dir_recurse = 1; break;
523 case 'm': dir_crossmount = 0; break; 833 case 'm': dir_crossmount = 0; break;
524 case 'x': show_pax = 1; break; 834 case 'x': show_pax = 1; break;
525 case 'e': show_stack = 1; break; 835 case 'e': show_stack = 1; break;
526 case 't': show_textrel = 1; break; 836 case 't': show_textrel = 1; break;
527 case 'r': show_rpath = 1; break; 837 case 'r': show_rpath = 1; break;
528 case 'n': show_needed = 1; break; 838 case 'n': show_needed = 1; break;
839 case 'i': show_interp = 1; break;
840 case 'b': show_bind = 1; break;
529 case 'q': be_quiet = 1; break; 841 case 'q': be_quiet = 1; break;
530 case 'v': be_verbose = (be_verbose % 20) + 1; break; 842 case 'v': be_verbose = (be_verbose % 20) + 1; break;
531 case 'a': show_pax = show_stack = show_textrel = show_needed = show_rpath = 1; break; 843 case 'a': show_pax = show_stack = show_textrel = show_rpath = \
844 show_needed = show_interp = show_bind = 1; break;
532 845
533 case ':': 846 case ':':
534 warn("Option missing parameter"); 847 err("Option missing parameter\n");
535 usage(EXIT_FAILURE);
536 break;
537 case '?': 848 case '?':
538 warn("Unknown option"); 849 err("Unknown option\n");
539 usage(EXIT_FAILURE);
540 break;
541 default: 850 default:
542 err("Unhandled option '%c'", flag); 851 err("Unhandled option '%c'", i);
543 break; 852 }
853 }
854
855 /* let the format option override all other options */
856 if (out_format) {
857 show_pax = show_stack = show_textrel = show_rpath = \
858 show_needed = show_interp = show_bind = 0;
859 for (i = 0; out_format[i]; ++i) {
860 if (out_format[i] != '%') continue;
861
862 switch (out_format[++i]) {
863 case '%': break;
864 case 'F': break;
865 case 's': break;
866 case 'o': break;
867 case 'x': show_pax = 1; break;
868 case 'e': show_stack = 1; break;
869 case 't': show_textrel = 1; break;
870 case 'r': show_rpath = 1; break;
871 case 'n': show_needed = 1; break;
872 case 'i': show_interp = 1; break;
873 case 'b': show_bind = 1; break;
874 default:
875 err("Invalid format specifier '%c' (byte %i)",
876 out_format[i], i+1);
544 } 877 }
545 } 878 }
546 879
547 if (be_quiet && be_verbose) 880 /* construct our default format */
548 err("You can be quiet or you can be verbose, not both, stupid"); 881 } else {
882 size_t fmt_len = 30;
883 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
884 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
885 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
886 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
887 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
888 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
889 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
890 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
891 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
892 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
893 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
894 }
895 if (be_verbose > 2) printf("Format: %s\n", out_format);
549 896
897 /* now lets actually do the scanning */
898 if (scan_ldpath || (show_rpath && be_quiet))
899 load_ld_so_conf();
550 if (scan_ldpath) scanelf_ldpath(); 900 if (scan_ldpath) scanelf_ldpath();
551 if (scan_envpath) scanelf_envpath(); 901 if (scan_envpath) scanelf_envpath();
902 if (from_file) {
903 scanelf_from_file(from_file);
904 free(from_file);
905 from_file = *argv;
906 }
552 if (optind == argc && !scan_ldpath && !scan_envpath) 907 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
553 err("Nothing to scan !?"); 908 err("Nothing to scan !?");
554 while (optind < argc) 909 while (optind < argc)
555 scanelf_dir(argv[optind++]); 910 scanelf_dir(argv[optind++]);
556 911
557 if (find_sym) free(find_sym); 912 /* clean up */
913 if (find_sym) {
914 free(find_sym);
915 free(versioned_symname);
916 }
917 if (out_format) free(out_format);
918 for (i = 0; ldpaths[i]; ++i)
919 free(ldpaths[i]);
558} 920}
559 921
922
923
924/* utility funcs */
925static char *xstrdup(const char *s)
926{
927 char *ret = strdup(s);
928 if (!ret) err("Could not strdup(): %s", strerror(errno));
929 return ret;
930}
931
932static void *xmalloc(size_t size)
933{
934 void *ret = malloc(size);
935 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
936 return ret;
937}
938
939static void xstrcat(char **dst, const char *src, size_t *curr_len)
940{
941 long new_len;
942
943 new_len = strlen(*dst) + strlen(src);
944 if (*curr_len <= new_len) {
945 *curr_len = new_len + (*curr_len / 2);
946 *dst = realloc(*dst, *curr_len);
947 if (!*dst)
948 err("could not realloc %li bytes", (unsigned long)*curr_len);
949 }
950
951 strcat(*dst, src);
952}
953
954static inline void xchrcat(char **dst, const char append, size_t *curr_len)
955{
956 static char my_app[2];
957 my_app[0] = append;
958 my_app[1] = '\0';
959 xstrcat(dst, my_app, curr_len);
960}
560 961
561 962
562int main(int argc, char *argv[]) 963int main(int argc, char *argv[])
563{ 964{
564 if (argc < 2) 965 if (argc < 2)
565 usage(EXIT_FAILURE); 966 usage(EXIT_FAILURE);
566 parseargs(argc, argv); 967 parseargs(argc, argv);
567 fclose(stdout); 968 fclose(stdout);
969#ifdef __BOUNDS_CHECKING_ON
970 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
971#endif
568 return EXIT_SUCCESS; 972 return EXIT_SUCCESS;
569} 973}

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