/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.35 Revision 1.56
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 1.56 2005/05/21 00:34:07 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
33#include <getopt.h> 33#include <getopt.h>
34#include <assert.h> 34#include <assert.h>
35 35
36#include "paxelf.h" 36#include "paxelf.h"
37 37
38static const char *rcsid = "$Id: scanelf.c,v 1.35 2005/04/14 00:17:30 solar Exp $"; 38static const char *rcsid = "$Id: scanelf.c,v 1.56 2005/05/21 00:34:07 vapier Exp $";
39 39#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 40
52 41
53 42
54/* prototypes */ 43/* prototypes */
55static void scanelf_file(const char *filename); 44static void scanelf_file(const char *filename);
56static void scanelf_dir(const char *path); 45static void scanelf_dir(const char *path);
57static void scanelf_ldpath(); 46static void scanelf_ldpath();
58static void scanelf_envpath(); 47static void scanelf_envpath();
59static void usage(int status); 48static void usage(int status);
60static void parseargs(int argc, char *argv[]); 49static void parseargs(int argc, char *argv[]);
50static char *xstrdup(char *s);
51static void *xmalloc(size_t size);
52static void xstrcat(char **dst, const char *src, size_t *curr_len);
53static inline void xchrcat(char **dst, const char append, size_t *curr_len);
61 54
62/* variables to control behavior */ 55/* variables to control behavior */
56static char *ldpaths[256];
63static char scan_ldpath = 0; 57static char scan_ldpath = 0;
64static char scan_envpath = 0; 58static char scan_envpath = 0;
59static char scan_symlink = 1;
65static char dir_recurse = 0; 60static char dir_recurse = 0;
66static char dir_crossmount = 1; 61static char dir_crossmount = 1;
67static char show_pax = 0; 62static char show_pax = 0;
68static char show_stack = 0; 63static char show_stack = 0;
69static char show_textrel = 0; 64static char show_textrel = 0;
70static char show_rpath = 0; 65static char show_rpath = 0;
71static char show_needed = 0; 66static char show_needed = 0;
67static char show_interp = 0;
68static char show_bind = 0;
72static char show_banner = 1; 69static char show_banner = 1;
73static char be_quiet = 0; 70static char be_quiet = 0;
74static char be_verbose = 0; 71static char be_verbose = 0;
72static char *find_sym = NULL, *versioned_symname = NULL;
75static char *find_sym = NULL; 73static char *out_format = NULL;
76 74
77 75
78 76
79/* scan an elf file and show all the fun stuff */ 77/* sub-funcs for scanelf_file() */
80static void scanelf_file(const char *filename) 78static char *scanelf_file_pax(elfobj *elf, char *found_pax)
81{ 79{
82 int i; 80 static char *paxflags;
83 char found_pax, found_stack, found_relro, found_textrel,
84 found_rpath, found_needed, found_sym;
85 elfobj *elf;
86 struct stat st;
87 81
88 /* make sure path exists */ 82 if (!show_pax) return NULL;
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 83
96 /* verify this is real ELF */
97 if ((elf = readelf(filename)) == NULL) {
98 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
99 return;
100 }
101
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;
119 }
120
121 /* dump all the good stuff */
122 if (!be_quiet)
123 printf("%-7s ", get_elfetype(elf));
124
125 if (show_pax) {
126 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); 84 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
127 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { 85 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
128 found_pax = 1; 86 *found_pax = 1;
129 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf))); 87 return paxflags;
130 } 88 }
131 }
132 89
133 /* stack fun */ 90 return NULL;
134 if (show_stack) { 91}
92static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
93{
94 static char ret[8];
95 char *found;
96 unsigned long i, off, shown;
97
98 if (!show_stack) return NULL;
99
100 shown = 0;
101 strcpy(ret, "--- ---");
102
103 if (elf->phdr) {
135#define SHOW_STACK(B) \ 104#define SHOW_STACK(B) \
136 if (elf->elf_class == ELFCLASS ## B) { \ 105 if (elf->elf_class == ELFCLASS ## B) { \
137 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 106 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
138 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 107 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
139 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 108 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
140 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 109 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
141 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \ 110 found = found_stack; \
111 off = 0; \
112 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
113 found = found_relro; \
114 off = 4; \
115 } else \
116 continue; \
142 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 117 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
143 continue; \ 118 continue; \
144 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \ 119 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
145 found_stack = 1; \ 120 *found = 1; \
146 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \ 121 ++shown; \
122 } \
123 }
124 SHOW_STACK(32)
125 SHOW_STACK(64)
126 }
127
128 if (be_quiet && !shown)
129 return NULL;
130 else
131 return ret;
132}
133static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
134{
135 static char *ret = "TEXTREL";
136 unsigned long i;
137
138 if (!show_textrel) return NULL;
139
140 if (elf->phdr) {
141#define SHOW_TEXTREL(B) \
142 if (elf->elf_class == ELFCLASS ## B) { \
143 Elf ## B ## _Dyn *dyn; \
144 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
145 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
146 Elf ## B ## _Off offset; \
147 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
148 if (phdr[i].p_type != PT_DYNAMIC) continue; \
149 offset = EGET(phdr[i].p_offset); \
150 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
151 dyn = DYN ## B (elf->data + offset); \
152 while (EGET(dyn->d_tag) != DT_NULL) { \
153 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
147 found_relro = 1; \ 154 *found_textrel = 1; \
148 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \ 155 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
156 return ret; \
157 } \
158 ++dyn; \
149 } \ 159 } \
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 } } 160 } }
176 SHOW_TEXTREL(32) 161 SHOW_TEXTREL(32)
177 SHOW_TEXTREL(64) 162 SHOW_TEXTREL(64)
178 if (!be_quiet && !found_textrel) fputs("------- ", stdout);
179 } 163 }
180 164
181 /* rpath fun */ 165 if (be_quiet)
182 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 166 return NULL;
183 if (show_rpath) { 167 else
168 return " - ";
169}
170static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
171{
172 /* TODO: when checking RPATH entries, check each subpath (between :) in ld.so.conf */
173 unsigned long i, s;
184 char *rpath, *runpath; 174 char *rpath, *runpath, **r;
175 void *strtbl_void;
176
177 if (!show_rpath) return;
178
185 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 179 strtbl_void = elf_findsecbyname(elf, ".dynstr");
186 rpath = runpath = NULL; 180 rpath = runpath = NULL;
187 181
188 if (strtbl_void) { 182 if (elf->phdr && strtbl_void) {
189#define SHOW_RPATH(B) \ 183#define SHOW_RPATH(B) \
190 if (elf->elf_class == ELFCLASS ## B) { \ 184 if (elf->elf_class == ELFCLASS ## B) { \
191 Elf ## B ## _Dyn *dyn; \ 185 Elf ## B ## _Dyn *dyn; \
192 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 186 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
193 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 187 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
194 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 188 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
189 Elf ## B ## _Off offset; \
190 Elf ## B ## _Sxword word; \
191 /* Scan all the program headers */ \
195 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 192 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
193 /* Just scan dynamic headers */ \
196 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 194 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
195 offset = EGET(phdr[i].p_offset); \
196 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
197 /* Just scan dynamic RPATH/RUNPATH headers */ \
197 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 198 dyn = DYN ## B (elf->data + offset); \
198 while (EGET(dyn->d_tag) != DT_NULL) { \ 199 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
199 if (EGET(dyn->d_tag) == DT_RPATH) { \ 200 if (word == DT_RPATH) { \
201 r = &rpath; \
202 } else if (word == DT_RUNPATH) { \
203 r = &runpath; \
204 } else { \
205 ++dyn; \
206 continue; \
207 } \
208 /* Verify the memory is somewhat sane */ \
200 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 209 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
210 if (offset < elf->len) { \
211 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
212 *r = (char*)(elf->data + offset); \
213 /* If quiet, don't output paths in ld.so.conf */ \
214 if (be_quiet) \
215 for (s = 0; ldpaths[s]; ++s) \
216 if (!strcmp(ldpaths[s], *r)) { \
217 *r = NULL; \
218 break; \
219 } \
201 found_rpath = 1; \ 220 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 } \ 221 } \
206 ++dyn; \ 222 ++dyn; \
207 } \ 223 } \
208 } } 224 } }
209 SHOW_RPATH(32) 225 SHOW_RPATH(32)
210 SHOW_RPATH(64) 226 SHOW_RPATH(64)
211 } 227 }
228
212 if (rpath && runpath) { 229 if (rpath && runpath) {
213 if (!strcmp(rpath, runpath)) 230 if (!strcmp(rpath, runpath)) {
214 printf("%-5s ", runpath); 231 xstrcat(ret, runpath, ret_len);
215 else { 232 } else {
216 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 233 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
217 printf("{%s,%s} ", rpath, runpath); 234 xchrcat(ret, '{', ret_len);
235 xstrcat(ret, rpath, ret_len);
236 xchrcat(ret, ',', ret_len);
237 xstrcat(ret, runpath, ret_len);
238 xchrcat(ret, '}', ret_len);
218 } 239 }
219 } else if (rpath || runpath) 240 } else if (rpath || runpath)
220 printf("%-5s ", (runpath ? runpath : rpath)); 241 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
221 else if (!be_quiet && !found_rpath) 242 else if (!be_quiet)
222 printf(" - "); 243 xstrcat(ret, " - ", ret_len);
223 } 244}
224 245static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
225 /* print out all the NEEDED entries */ 246{
226 if (show_needed) { 247 unsigned long i;
227 char *needed; 248 char *needed;
249 void *strtbl_void;
250
251 if (!show_needed) return;
252
228 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 253 strtbl_void = elf_findsecbyname(elf, ".dynstr");
229 254
230 if (strtbl_void) { 255 if (elf->phdr && strtbl_void) {
231#define SHOW_NEEDED(B) \ 256#define SHOW_NEEDED(B) \
232 if (elf->elf_class == ELFCLASS ## B) { \ 257 if (elf->elf_class == ELFCLASS ## B) { \
233 Elf ## B ## _Dyn *dyn; \ 258 Elf ## B ## _Dyn *dyn; \
234 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 259 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
235 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 260 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
236 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 261 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
262 Elf ## B ## _Off offset; \
237 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 263 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; \ 264 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
265 offset = EGET(phdr[i].p_offset); \
266 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
244 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 267 dyn = DYN ## B (elf->data + offset); \
245 while (EGET(dyn->d_tag) != DT_NULL) { \ 268 while (EGET(dyn->d_tag) != DT_NULL) { \
246 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 269 if (EGET(dyn->d_tag) == DT_NEEDED) { \
247 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 270 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
248 if (found_needed) printf(","); \ 271 if (offset >= elf->len) { \
249 printf("%s", needed); \ 272 ++dyn; \
273 continue; \
274 } \
275 needed = (char*)(elf->data + offset); \
276 if (*found_needed) xchrcat(ret, ',', ret_len); \
277 xstrcat(ret, needed, ret_len); \
250 found_needed = 1; \ 278 *found_needed = 1; \
251 } \ 279 } \
252 ++dyn; \ 280 ++dyn; \
253 } \ 281 } \
254 } } 282 } }
255 SHOW_NEEDED(32) 283 SHOW_NEEDED(32)
256 SHOW_NEEDED(64) 284 SHOW_NEEDED(64)
257 } 285 }
258 if (!be_quiet && !found_needed) 286}
259 printf(" - "); 287static char *scanelf_file_interp(elfobj *elf, char *found_interp)
260 else if (found_needed) 288{
261 printf(" "); 289 void *strtbl_void;
290
291 if (!show_interp) return NULL;
292
293 strtbl_void = elf_findsecbyname(elf, ".interp");
294
295 if (strtbl_void) {
296#define SHOW_INTERP(B) \
297 if (elf->elf_class == ELFCLASS ## B) { \
298 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
299 *found_interp = 1; \
300 return elf->data + EGET(strtbl->sh_offset); \
262 } 301 }
302 SHOW_INTERP(32)
303 SHOW_INTERP(64)
304 }
305 return NULL;
306}
307static char *scanelf_file_bind(elfobj *elf, char *found_bind)
308{
309 unsigned long i;
310 struct stat s;
263 311
264 /* search the symbol table for a specified symbol */ 312 if (!show_bind) return NULL;
265 if (find_sym) { 313 if (!elf->phdr) return NULL;
314
315#define SHOW_BIND(B) \
316 if (elf->elf_class == ELFCLASS ## B) { \
317 Elf ## B ## _Dyn *dyn; \
318 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
319 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
320 Elf ## B ## _Off offset; \
321 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
322 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
323 offset = EGET(phdr[i].p_offset); \
324 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
325 dyn = DYN ## B (elf->data + offset); \
326 while (EGET(dyn->d_tag) != DT_NULL) { \
327 if (EGET(dyn->d_tag) == DT_BIND_NOW || \
328 (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
329 { \
330 if (be_quiet) return NULL; \
331 *found_bind = 1; \
332 return "NOW"; \
333 } \
334 ++dyn; \
335 } \
336 } \
337 }
338 SHOW_BIND(32)
339 SHOW_BIND(64)
340
341 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
342 return NULL;
343 } else {
344 *found_bind = 1;
345 return "LAZY";
346 }
347}
348static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
349{
350 unsigned long i;
266 void *symtab_void, *strtab_void; 351 void *symtab_void, *strtab_void;
267 char *versioned_symname;
268 size_t len;
269 352
270 len = strlen(find_sym) + 1; 353 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);
277 354
278 symtab_void = elf_findsecbyname(elf, ".symtab"); 355 symtab_void = elf_findsecbyname(elf, ".symtab");
279 strtab_void = elf_findsecbyname(elf, ".strtab"); 356 strtab_void = elf_findsecbyname(elf, ".strtab");
280 357
281 if (symtab_void && strtab_void) { 358 if (symtab_void && strtab_void) {
282#define FIND_SYM(B) \ 359#define FIND_SYM(B) \
283 if (elf->elf_class == ELFCLASS ## B) { \ 360 if (elf->elf_class == ELFCLASS ## B) { \
284 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 361 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
285 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 362 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
286 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 363 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
287 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 364 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
288 char *symname; \ 365 char *symname; \
289 for (i = 0; i < cnt; ++i) { \ 366 for (i = 0; i < cnt; ++i) { \
290 if (sym->st_name) { \ 367 if (sym->st_name) { \
291 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 368 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
292 if (*find_sym == '*') { \ 369 if (*find_sym == '*') { \
293 printf("%s(%s) %5lX %15s %s\n", \ 370 printf("%s(%s) %5lX %15s %s\n", \
294 ((found_sym == 0) ? "\n\t" : "\t"), \ 371 ((*found_sym == 0) ? "\n\t" : "\t"), \
295 (char *)basename(filename), \ 372 (char *)basename(filename), \
296 (long)sym->st_size, \ 373 (long)sym->st_size, \
297 (char *)get_elfstttype(sym->st_info), \ 374 (char *)get_elfstttype(sym->st_info), \
298 symname); \ 375 symname); \
299 found_sym = 1; \ 376 *found_sym = 1; \
300 } else if ((strcmp(find_sym, symname) == 0) || \ 377 } else if ((strcmp(find_sym, symname) == 0) || \
301 (strncmp(symname, versioned_symname, len) == 0)) \ 378 (strcmp(symname, versioned_symname) == 0)) \
302 found_sym++; \ 379 (*found_sym)++; \
303 } \ 380 } \
304 ++sym; \ 381 ++sym; \
305 } } 382 } }
306 FIND_SYM(32) 383 FIND_SYM(32)
307 FIND_SYM(64) 384 FIND_SYM(64)
385 }
386 if (*find_sym != '*' && *found_sym)
387 return find_sym;
388 if (be_quiet)
389 return NULL;
390 else
391 return " - ";
392}
393/* scan an elf file and show all the fun stuff */
394#define prints(str) fputs(str, stdout)
395static void scanelf_file(const char *filename)
396{
397 unsigned long i;
398 char found_pax, found_stack, found_relro, found_textrel,
399 found_rpath, found_needed, found_interp, found_bind,
400 found_sym, found_file;
401 elfobj *elf;
402 struct stat st;
403 static char *out_buffer = NULL;
404 static size_t out_len;
405
406 /* make sure 'filename' exists */
407 if (lstat(filename, &st) == -1) {
408 if (be_verbose > 2) printf("%s: does not exist\n", filename);
409 return;
410 }
411 /* always handle regular files and handle symlinked files if no -y */
412 if (S_ISLNK(st.st_mode)) {
413 if (!scan_symlink) return;
414 stat(filename, &st);
415 }
416 if (!S_ISREG(st.st_mode)) {
417 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
418 return;
419 }
420
421 found_pax = found_stack = found_relro = found_textrel = \
422 found_rpath = found_needed = found_interp = found_bind = \
423 found_sym = found_file = 0;
424
425 /* verify this is real ELF */
426 if ((elf = readelf(filename)) == NULL) {
427 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
428 return;
429 }
430
431 if (be_verbose > 1)
432 printf("%s: scanning file {%s,%s}\n", filename,
433 get_elfeitype(elf, EI_CLASS, elf->elf_class),
434 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
435 else if (be_verbose)
436 printf("%s: scanning file\n", filename);
437
438 /* init output buffer */
439 if (!out_buffer) {
440 out_len = sizeof(char) * 80;
441 out_buffer = (char*)xmalloc(out_len);
442 }
443 *out_buffer = '\0';
444
445 /* show the header */
446 if (!be_quiet && show_banner) {
447 for (i = 0; out_format[i]; ++i) {
448 if (out_format[i] != '%') continue;
449
450 switch (out_format[++i]) {
451 case '%': break;
452 case 'F': prints("FILE "); found_file = 1; break;
453 case 'o': prints(" TYPE "); break;
454 case 'x': prints(" PAX "); break;
455 case 'e': prints("STK/REL "); break;
456 case 't': prints("TEXTREL "); break;
457 case 'r': prints("RPATH "); break;
458 case 'n': prints("NEEDED "); break;
459 case 'i': prints("INTERP "); break;
460 case 'b': prints("BIND "); break;
461 case 's': prints("SYM "); break;
308 } 462 }
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 } 463 }
464 if (!found_file) prints("FILE ");
465 prints("\n");
466 found_file = 0;
467 show_banner = 0;
468 }
317 469
470 /* dump all the good stuff */
471 for (i = 0; out_format[i]; ++i) {
472 const char *out;
473
474 /* make sure we trim leading spaces in quiet mode */
475 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
476 *out_buffer = '\0';
477
478 if (out_format[i] != '%') {
479 xchrcat(&out_buffer, out_format[i], &out_len);
480 continue;
481 }
482
483 out = NULL;
484 switch (out_format[++i]) {
485 case '%': xchrcat(&out_buffer, '%', &out_len); break;
486 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
487 case 'o': out = get_elfetype(elf); break;
488 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
489 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
490 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
491 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
492 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
493 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
494 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
495 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
496 }
497 if (out) xstrcat(&out_buffer, out, &out_len);
498 }
499
500#define FOUND_SOMETHING() \
318 if (!be_quiet || found_pax || found_stack || found_textrel || \ 501 (found_pax || found_stack || found_textrel || found_rpath || \
319 found_rpath || found_needed || found_sym) 502 found_needed || found_interp || found_bind || found_sym)
320 puts(filename); 503
504 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
505 xchrcat(&out_buffer, ' ', &out_len);
506 xstrcat(&out_buffer, filename, &out_len);
507 }
508 if (!be_quiet || (be_quiet && FOUND_SOMETHING()))
509 puts(out_buffer);
321 510
322 unreadelf(elf); 511 unreadelf(elf);
323} 512}
324 513
325/* scan a directory for ET_EXEC files and print when we find one */ 514/* scan a directory for ET_EXEC files and print when we find one */
330 struct stat st_top, st; 519 struct stat st_top, st;
331 char buf[_POSIX_PATH_MAX]; 520 char buf[_POSIX_PATH_MAX];
332 size_t pathlen = 0, len = 0; 521 size_t pathlen = 0, len = 0;
333 522
334 /* make sure path exists */ 523 /* make sure path exists */
335 if (lstat(path, &st_top) == -1) 524 if (lstat(path, &st_top) == -1) {
525 if (be_verbose > 2) printf("%s: does not exist\n", path);
336 return; 526 return;
527 }
337 528
338 /* ok, if it isn't a directory, assume we can open it */ 529 /* ok, if it isn't a directory, assume we can open it */
339 if (!S_ISDIR(st_top.st_mode)) { 530 if (!S_ISDIR(st_top.st_mode)) {
340 scanelf_file(path); 531 scanelf_file(path);
341 return; 532 return;
368 } 559 }
369 } 560 }
370 closedir(dir); 561 closedir(dir);
371} 562}
372 563
564static int scanelf_from_file(char *filename)
565{
566 FILE *fp = NULL;
567 char *p;
568 char path[_POSIX_PATH_MAX];
569
570 if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
571 fp = stdin;
572 else if ((fp = fopen(filename, "r")) == NULL)
573 return 1;
574
575 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
576 if ((p = strchr(path, '\n')) != NULL)
577 *p = 0;
578 scanelf_dir(path);
579 }
580 if (fp != stdin)
581 fclose(fp);
582 return 0;
583}
584
585static void load_ld_so_conf()
586{
587 FILE *fp = NULL;
588 char *p;
589 char path[_POSIX_PATH_MAX];
590 int i = 0;
591
592 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
593 return;
594
595 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) {
596 if (*path != '/')
597 continue;
598
599 if ((p = strrchr(path, '\r')) != NULL)
600 *p = 0;
601 if ((p = strchr(path, '\n')) != NULL)
602 *p = 0;
603
604 ldpaths[i++] = xstrdup(path);
605
606 if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
607 break;
608 }
609 ldpaths[i] = NULL;
610
611 fclose(fp);
612}
613
373/* scan /etc/ld.so.conf for paths */ 614/* scan /etc/ld.so.conf for paths */
374static void scanelf_ldpath() 615static void scanelf_ldpath()
375{ 616{
376 char scan_l, scan_ul, scan_ull; 617 char scan_l, scan_ul, scan_ull;
377 char *path, *p; 618 int i = 0;
378 FILE *fp;
379 619
380 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 620 if (!ldpaths[0])
381 err("Unable to open ld.so.conf: %s", strerror(errno)); 621 err("Unable to load any paths from ld.so.conf");
382 622
383 scan_l = scan_ul = scan_ull = 0; 623 scan_l = scan_ul = scan_ull = 0;
384 624
385 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) { 625 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; 626 if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
396 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 627 if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
397 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 628 if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
398 scanelf_dir(path); 629 scanelf_dir(ldpaths[i]);
630 ++i;
399 } 631 }
400 free(path);
401 fclose(fp);
402 632
403 if (!scan_l) scanelf_dir("/lib"); 633 if (!scan_l) scanelf_dir("/lib");
404 if (!scan_ul) scanelf_dir("/usr/lib"); 634 if (!scan_ul) scanelf_dir("/usr/lib");
405 if (!scan_ull) scanelf_dir("/usr/local/lib"); 635 if (!scan_ull) scanelf_dir("/usr/local/lib");
406} 636}
411 char *path, *p; 641 char *path, *p;
412 642
413 path = getenv("PATH"); 643 path = getenv("PATH");
414 if (!path) 644 if (!path)
415 err("PATH is not set in your env !"); 645 err("PATH is not set in your env !");
416 646 path = xstrdup(path);
417 if ((path = strdup(path)) == NULL)
418 err("strdup failed: %s", strerror(errno));
419 647
420 while ((p = strrchr(path, ':')) != NULL) { 648 while ((p = strrchr(path, ':')) != NULL) {
421 scanelf_dir(p + 1); 649 scanelf_dir(p + 1);
422 *p = 0; 650 *p = 0;
423 } 651 }
426} 654}
427 655
428 656
429 657
430/* usage / invocation handling functions */ 658/* usage / invocation handling functions */
431#define PARSE_FLAGS "plRmxetrns:aqvo:BhV" 659#define PARSE_FLAGS "plRmyxetrnibs:aqvF:f:o:BhV"
432#define a_argument required_argument 660#define a_argument required_argument
433static struct option const long_opts[] = { 661static struct option const long_opts[] = {
434 {"path", no_argument, NULL, 'p'}, 662 {"path", no_argument, NULL, 'p'},
435 {"ldpath", no_argument, NULL, 'l'}, 663 {"ldpath", no_argument, NULL, 'l'},
436 {"recursive", no_argument, NULL, 'R'}, 664 {"recursive", no_argument, NULL, 'R'},
437 {"mount", no_argument, NULL, 'm'}, 665 {"mount", no_argument, NULL, 'm'},
666 {"symlink", no_argument, NULL, 'y'},
438 {"pax", no_argument, NULL, 'x'}, 667 {"pax", no_argument, NULL, 'x'},
439 {"header", no_argument, NULL, 'e'}, 668 {"header", no_argument, NULL, 'e'},
440 {"textrel", no_argument, NULL, 't'}, 669 {"textrel", no_argument, NULL, 't'},
441 {"rpath", no_argument, NULL, 'r'}, 670 {"rpath", no_argument, NULL, 'r'},
442 {"needed", no_argument, NULL, 'n'}, 671 {"needed", no_argument, NULL, 'n'},
672 {"interp", no_argument, NULL, 'i'},
673 {"bind", no_argument, NULL, 'b'},
443 {"symbol", a_argument, NULL, 's'}, 674 {"symbol", a_argument, NULL, 's'},
444 {"all", no_argument, NULL, 'a'}, 675 {"all", no_argument, NULL, 'a'},
445 {"quiet", no_argument, NULL, 'q'}, 676 {"quiet", no_argument, NULL, 'q'},
446 {"verbose", no_argument, NULL, 'v'}, 677 {"verbose", no_argument, NULL, 'v'},
678 {"format", a_argument, NULL, 'F'},
679 {"from", a_argument, NULL, 'f'},
447 {"file", a_argument, NULL, 'o'}, 680 {"file", a_argument, NULL, 'o'},
448 {"nobanner", no_argument, NULL, 'B'}, 681 {"nobanner", no_argument, NULL, 'B'},
449 {"help", no_argument, NULL, 'h'}, 682 {"help", no_argument, NULL, 'h'},
450 {"version", no_argument, NULL, 'V'}, 683 {"version", no_argument, NULL, 'V'},
451 {NULL, no_argument, NULL, 0x0} 684 {NULL, no_argument, NULL, 0x0}
452}; 685};
453static char *opts_help[] = { 686static char *opts_help[] = {
454 "Scan all directories in PATH environment", 687 "Scan all directories in PATH environment",
455 "Scan all directories in /etc/ld.so.conf", 688 "Scan all directories in /etc/ld.so.conf",
456 "Scan directories recursively", 689 "Scan directories recursively",
457 "Don't recursively cross mount points\n", 690 "Don't recursively cross mount points",
691 "Don't scan symlinks\n",
458 "Print PaX markings", 692 "Print PaX markings",
459 "Print GNU_STACK markings", 693 "Print GNU_STACK markings",
460 "Print TEXTREL information", 694 "Print TEXTREL information",
461 "Print RPATH information", 695 "Print RPATH information",
462 "Print NEEDED information", 696 "Print NEEDED information",
697 "Print INTERP information",
698 "Print BIND information",
463 "Find a specified symbol", 699 "Find a specified symbol",
464 "Print all scanned info (-x -e -t -r)\n", 700 "Print all scanned info (-x -e -t -r -n -i)\n",
465 "Only output 'bad' things", 701 "Only output 'bad' things",
466 "Be verbose (can be specified more than once)", 702 "Be verbose (can be specified more than once)",
703 "Use specified format for output",
704 "Read input stream from a filename",
467 "Write output stream to a filename", 705 "Write output stream to a filename",
468 "Don't display the header", 706 "Don't display the header",
469 "Print this help and exit", 707 "Print this help and exit",
470 "Print version and exit", 708 "Print version and exit",
471 NULL 709 NULL
472}; 710};
473 711
474/* display usage and exit */ 712/* display usage and exit */
475static void usage(int status) 713static void usage(int status)
476{ 714{
477 int i; 715 unsigned long i;
478 printf(" Scan ELF binaries for stuff\n" 716 printf("* Scan ELF binaries for stuff\n\n"
479 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 717 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
480 printf("Options: -[%s]\n", PARSE_FLAGS); 718 printf("Options: -[%s]\n", PARSE_FLAGS);
481 for (i = 0; long_opts[i].name; ++i) 719 for (i = 0; long_opts[i].name; ++i)
482 if (long_opts[i].has_arg == no_argument) 720 if (long_opts[i].has_arg == no_argument)
483 printf(" -%c, --%-13s %s\n", long_opts[i].val, 721 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
484 long_opts[i].name, opts_help[i]); 722 long_opts[i].name, opts_help[i]);
485 else 723 else
486 printf(" -%c, --%-6s <arg> %s\n", long_opts[i].val, 724 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
487 long_opts[i].name, opts_help[i]); 725 long_opts[i].name, opts_help[i]);
726
727 if (status != EXIT_SUCCESS)
728 exit(status);
729
730 puts("\nThe format modifiers for the -F option are:");
731 puts(" %F Filename \t%x PaX Flags \t%e STACK/RELRO");
732 puts(" %t TEXTREL \t%r RPATH \t%n NEEDED");
733 puts(" %i INTERP \t%b BIND \t%s symbol");
734
488 exit(status); 735 exit(status);
489} 736}
490 737
491/* parse command line arguments and preform needed actions */ 738/* parse command line arguments and preform needed actions */
492static void parseargs(int argc, char *argv[]) 739static void parseargs(int argc, char *argv[])
493{ 740{
494 int flag; 741 int i;
742 char *from_file = NULL;
495 743
496 opterr = 0; 744 opterr = 0;
497 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 745 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
498 switch (flag) { 746 switch (i) {
499 747
500 case 'V': /* version info */ 748 case 'V':
501 printf("%s compiled %s\n%s\n" 749 printf("%s compiled %s\n%s\n"
502 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 750 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
503 __FILE__, __DATE__, rcsid, argv0); 751 __FILE__, __DATE__, rcsid, argv0);
504 exit(EXIT_SUCCESS); 752 exit(EXIT_SUCCESS);
505 break; 753 break;
506 case 'h': usage(EXIT_SUCCESS); break; 754 case 'h': usage(EXIT_SUCCESS); break;
507 755 case 'f':
756 if (from_file == NULL)
757 from_file = xstrdup(optarg);
758 break;
508 case 'o': { 759 case 'o': {
509 FILE *fp = NULL; 760 FILE *fp = NULL;
510 fp = freopen(optarg, "w", stdout); 761 fp = freopen(optarg, "w", stdout);
511 if (fp == NULL) 762 if (fp == NULL)
512 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 763 err("Could not open output stream '%s': %s", optarg, strerror(errno));
513 stdout = fp; 764 stdout = fp;
514 break; 765 break;
515 } 766 }
516 767
517 case 's': find_sym = strdup(optarg); break; 768 case 's': {
769 size_t len;
770 find_sym = xstrdup(optarg);
771 len = strlen(find_sym) + 1;
772 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
773 sprintf(versioned_symname, "%s@", find_sym);
774 break;
775 }
518 776
777 case 'F': {
778 out_format = xstrdup(optarg);
779 break;
780 }
781
782 case 'y': scan_symlink = 0; break;
519 case 'B': show_banner = 0; break; 783 case 'B': show_banner = 0; break;
520 case 'l': scan_ldpath = 1; break; 784 case 'l': scan_ldpath = 1; break;
521 case 'p': scan_envpath = 1; break; 785 case 'p': scan_envpath = 1; break;
522 case 'R': dir_recurse = 1; break; 786 case 'R': dir_recurse = 1; break;
523 case 'm': dir_crossmount = 0; break; 787 case 'm': dir_crossmount = 0; break;
524 case 'x': show_pax = 1; break; 788 case 'x': show_pax = 1; break;
525 case 'e': show_stack = 1; break; 789 case 'e': show_stack = 1; break;
526 case 't': show_textrel = 1; break; 790 case 't': show_textrel = 1; break;
527 case 'r': show_rpath = 1; break; 791 case 'r': show_rpath = 1; break;
528 case 'n': show_needed = 1; break; 792 case 'n': show_needed = 1; break;
793 case 'i': show_interp = 1; break;
794 case 'b': show_bind = 1; break;
529 case 'q': be_quiet = 1; break; 795 case 'q': be_quiet = 1; break;
530 case 'v': be_verbose = (be_verbose % 20) + 1; break; 796 case 'v': be_verbose = (be_verbose % 20) + 1; break;
531 case 'a': show_pax = show_stack = show_textrel = show_needed = show_rpath = 1; break; 797 case 'a': show_pax = show_stack = show_textrel = show_rpath = \
798 show_needed = show_interp = show_bind = 1; break;
532 799
533 case ':': 800 case ':':
534 warn("Option missing parameter"); 801 err("Option missing parameter\n");
535 usage(EXIT_FAILURE);
536 break;
537 case '?': 802 case '?':
538 warn("Unknown option"); 803 err("Unknown option\n");
539 usage(EXIT_FAILURE);
540 break;
541 default: 804 default:
542 err("Unhandled option '%c'", flag); 805 err("Unhandled option '%c'", i);
543 break; 806 }
807 }
808
809 /* let the format option override all other options */
810 if (out_format) {
811 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0;
812 for (i = 0; out_format[i]; ++i) {
813 if (out_format[i] != '%') continue;
814
815 switch (out_format[++i]) {
816 case '%': break;
817 case 'F': break;
818 case 's': break;
819 case 'o': break;
820 case 'x': show_pax = 1; break;
821 case 'e': show_stack = 1; break;
822 case 't': show_textrel = 1; break;
823 case 'r': show_rpath = 1; break;
824 case 'n': show_needed = 1; break;
825 case 'i': show_interp = 1; break;
826 case 'b': show_bind = 1; break;
827 default:
828 err("Invalid format specifier '%c' (byte %i)",
829 out_format[i], i+1);
544 } 830 }
545 } 831 }
546 832
547 if (be_quiet && be_verbose) 833 /* construct our default format */
548 err("You can be quiet or you can be verbose, not both, stupid"); 834 } else {
835 size_t fmt_len = 30;
836 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
837 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
838 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
839 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
840 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
841 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
842 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
843 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
844 if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
845 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
846 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
847 }
848 if (be_verbose > 2) printf("Format: %s\n", out_format);
549 849
850 /* now lets actually do the scanning */
851 if (scan_ldpath || (show_rpath && be_quiet))
852 load_ld_so_conf();
550 if (scan_ldpath) scanelf_ldpath(); 853 if (scan_ldpath) scanelf_ldpath();
551 if (scan_envpath) scanelf_envpath(); 854 if (scan_envpath) scanelf_envpath();
855 if (from_file) {
856 scanelf_from_file(from_file);
857 free(from_file);
858 from_file = *argv;
859 }
552 if (optind == argc && !scan_ldpath && !scan_envpath) 860 if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
553 err("Nothing to scan !?"); 861 err("Nothing to scan !?");
554 while (optind < argc) 862 while (optind < argc)
555 scanelf_dir(argv[optind++]); 863 scanelf_dir(argv[optind++]);
556 864
557 if (find_sym) free(find_sym); 865 /* clean up */
866 if (find_sym) {
867 free(find_sym);
868 free(versioned_symname);
869 }
870 if (out_format) free(out_format);
871 for (i = 0; ldpaths[i]; ++i)
872 free(ldpaths[i]);
873}
874
875
876
877/* utility funcs */
878static char *xstrdup(char *s)
879{
880 char *ret = strdup(s);
881 if (!ret) err("Could not strdup(): %s", strerror(errno));
882 return ret;
883}
884static void *xmalloc(size_t size)
885{
886 void *ret = malloc(size);
887 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
888 return ret;
889}
890static void xstrcat(char **dst, const char *src, size_t *curr_len)
891{
892 long new_len;
893
894 new_len = strlen(*dst) + strlen(src);
895 if (*curr_len <= new_len) {
896 *curr_len = new_len + (*curr_len / 2);
897 *dst = realloc(*dst, *curr_len);
898 if (!*dst)
899 err("could not realloc %li bytes", (unsigned long)*curr_len);
900 }
901
902 strcat(*dst, src);
903}
904static inline void xchrcat(char **dst, const char append, size_t *curr_len)
905{
906 static char my_app[2];
907 my_app[0] = append;
908 my_app[1] = '\0';
909 xstrcat(dst, my_app, curr_len);
558} 910}
559 911
560 912
561 913
562int main(int argc, char *argv[]) 914int main(int argc, char *argv[])

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