/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.28 Revision 1.43
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 1.28 2005/04/05 03:41:27 solar Exp $ 5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.43 2005/05/06 02:55:27 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 1.28 2005/04/05 03:41:27 solar Exp $"; 38static const char *rcsid = "$Id: scanelf.c,v 1.43 2005/05/06 02:55:27 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);
54static int xemptybuffer(const char *buff);
61 55
62/* variables to control behavior */ 56/* variables to control behavior */
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;
66static char show_needed = 0;
67static char show_interp = 0;
71static char show_banner = 1; 68static char show_banner = 1;
72static char be_quiet = 0; 69static char be_quiet = 0;
73static char be_verbose = 0; 70static char be_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL;
74static char *find_sym = NULL; 72static char *out_format = NULL;
75 73
76 74
77 75
78/* scan an elf file and show all the fun stuff */ 76/* sub-funcs for scanelf_file() */
79static void scanelf_file(const char *filename) 77static char *scanelf_file_pax(elfobj *elf, char *found_pax)
80{ 78{
79 static char *paxflags;
80
81 if (!show_pax) return NULL;
82
83 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
84 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
85 *found_pax = 1;
86 return paxflags;
87 }
88
89 return NULL;
90}
91static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
92{
93 static char ret[8];
94 char *found;
95 int i, off, shown;
96
97 if (!show_stack) return NULL;
98
99 shown = 0;
100 strcpy(ret, "--- ---");
101#define SHOW_STACK(B) \
102 if (elf->elf_class == ELFCLASS ## B) { \
103 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
104 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
105 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
106 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
107 found = found_stack; \
108 off = 0; \
109 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
110 found = found_relro; \
111 off = 3; \
112 } else \
113 continue; \
114 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
115 continue; \
116 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
117 *found = 1; \
118 ++shown; \
119 } \
120 }
121 SHOW_STACK(32)
122 SHOW_STACK(64)
123 if (be_quiet && !shown)
124 return NULL;
125 else
126 return ret;
127}
128static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
129{
130 static char *ret = "TEXTREL";
81 int i; 131 int i;
82 char found_pax, found_stack, found_relro, found_textrel, found_rpath, found_sym;
83 elfobj *elf;
84 132
85 found_pax = found_stack = found_relro = found_textrel = found_rpath = found_sym = 0; 133 if (!show_textrel) return NULL;
86 134
87 /* verify this is real ELF */
88 if ((elf = readelf(filename)) == NULL) {
89 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
90 return;
91 }
92
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;
109 }
110
111 /* dump all the good stuff */
112 if (!be_quiet)
113 printf("%-7s ", get_elfetype(elf));
114
115 if (show_pax) {
116 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
117 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
118 found_pax = 1;
119 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
120 }
121 }
122
123 /* stack fun */
124 if (show_stack) {
125#define SHOW_STACK(B) \ 135#define SHOW_TEXTREL(B) \
126 if (elf->elf_class == ELFCLASS ## B) { \ 136 if (elf->elf_class == ELFCLASS ## B) { \
137 Elf ## B ## _Dyn *dyn; \
127 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 138 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
128 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 139 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
129 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 140 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
130 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 141 if (phdr[i].p_type != PT_DYNAMIC) continue; \
131 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \ 142 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
132 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 143 while (EGET(dyn->d_tag) != DT_NULL) { \
133 continue; \ 144 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
134 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \
135 found_stack = 1; \
136 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \
137 found_relro = 1; \ 145 *found_textrel = 1; \
138 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \ 146 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
147 return ret; \
148 } \
149 ++dyn; \
139 } \ 150 } \
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 } } 151 } }
166 SHOW_TEXTREL(32) 152 SHOW_TEXTREL(32)
167 SHOW_TEXTREL(64) 153 SHOW_TEXTREL(64)
168 if (!be_quiet && !found_textrel) printf("------- "); 154 if (be_quiet)
169 } 155 return NULL;
170 156 else
171 /* rpath fun */ 157 return " - ";
158}
159static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
160{
172 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 161 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
173 if (show_rpath) { 162 int i;
174 char *rpath, *runpath; 163 char *rpath, *runpath;
164 void *strtbl_void;
165
166 if (!show_rpath) return;
167
175 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 168 strtbl_void = elf_findsecbyname(elf, ".dynstr");
176 rpath = runpath = NULL; 169 rpath = runpath = NULL;
177 170
178 if (strtbl_void) { 171 if (strtbl_void) {
179#define SHOW_RPATH(B) \ 172#define SHOW_RPATH(B) \
180 if (elf->elf_class == ELFCLASS ## B) { \ 173 if (elf->elf_class == ELFCLASS ## B) { \
181 Elf ## B ## _Dyn *dyn; \ 174 Elf ## B ## _Dyn *dyn; \
182 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 175 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
183 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 176 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
185 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 178 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
186 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 179 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
187 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 180 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
188 while (EGET(dyn->d_tag) != DT_NULL) { \ 181 while (EGET(dyn->d_tag) != DT_NULL) { \
189 if (EGET(dyn->d_tag) == DT_RPATH) { \ 182 if (EGET(dyn->d_tag) == DT_RPATH) { \
183 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \
190 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 184 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
191 found_rpath = 1; \ 185 *found_rpath = 1; \
192 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 186 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
187 if (runpath) warn("ELF has multiple DT_RUNPATH's !?"); \
193 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 188 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
194 found_rpath = 1; \ 189 *found_rpath = 1; \
195 } \ 190 } \
196 ++dyn; \ 191 ++dyn; \
197 } \ 192 } \
198 } } 193 } }
199 SHOW_RPATH(32) 194 SHOW_RPATH(32)
200 SHOW_RPATH(64) 195 SHOW_RPATH(64)
201 } 196 }
197
202 if (rpath && runpath) { 198 if (rpath && runpath) {
203 if (!strcmp(rpath, runpath)) 199 if (!strcmp(rpath, runpath)) {
204 printf("%-5s ", runpath); 200 xstrcat(ret, runpath, ret_len);
205 else { 201 } else {
206 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 202 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
207 printf("{%s,%s} ", rpath, runpath); 203 xchrcat(ret, '{', ret_len);
204 xstrcat(ret, rpath, ret_len);
205 xchrcat(ret, ',', ret_len);
206 xstrcat(ret, runpath, ret_len);
207 xchrcat(ret, '}', ret_len);
208 } 208 }
209 } else if (rpath || runpath) 209 } else if (rpath || runpath)
210 printf("%-5s ", (runpath ? runpath : rpath)); 210 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
211 else if (!be_quiet && !found_rpath) 211 else if (!be_quiet)
212 printf(" - "); 212 xstrcat(ret, " - ", ret_len);
213}
214static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
215{
216 int i;
217 char *needed;
218 void *strtbl_void;
219
220 if (!show_needed) return;
221
222 strtbl_void = elf_findsecbyname(elf, ".dynstr");
223
224 if (strtbl_void) {
225#define SHOW_NEEDED(B) \
226 if (elf->elf_class == ELFCLASS ## B) { \
227 Elf ## B ## _Dyn *dyn; \
228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
229 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
231 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
232 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
233 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
234 while (EGET(dyn->d_tag) != DT_NULL) { \
235 if (EGET(dyn->d_tag) == DT_NEEDED) { \
236 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
237 if (*found_needed) xchrcat(ret, ',', ret_len); \
238 xstrcat(ret, needed, ret_len); \
239 *found_needed = 1; \
240 } \
241 ++dyn; \
242 } \
243 } }
244 SHOW_NEEDED(32)
245 SHOW_NEEDED(64)
246 }
247}
248static char *scanelf_file_interp(elfobj *elf, char *found_interp)
249{
250 void *strtbl_void;
251
252 if (!show_interp) return NULL;
253
254 strtbl_void = elf_findsecbyname(elf, ".interp");
255
256 if (strtbl_void) {
257#define SHOW_INTERP(B) \
258 if (elf->elf_class == ELFCLASS ## B) { \
259 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
260 *found_interp = 1; \
261 return elf->data + EGET(strtbl->sh_offset); \
213 } 262 }
214 263 SHOW_INTERP(32)
215 if (find_sym) { 264 SHOW_INTERP(64)
265 }
266 return NULL;
267}
268static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
269{
270 int i;
216 void *symtab_void, *strtab_void; 271 void *symtab_void, *strtab_void;
217 char found_sym = 0;
218 char *versioned_symname = malloc(strlen(find_sym)+1);
219 272
220 sprintf(versioned_symname, "%s@", find_sym); 273 if (!find_sym) return NULL;
274
221 symtab_void = elf_findsecbyname(elf, ".symtab"); 275 symtab_void = elf_findsecbyname(elf, ".symtab");
222 strtab_void = elf_findsecbyname(elf, ".strtab"); 276 strtab_void = elf_findsecbyname(elf, ".strtab");
223 277
224 if (symtab_void && strtab_void) { 278 if (symtab_void && strtab_void) {
225#define FIND_SYM(B) \ 279#define FIND_SYM(B) \
226 if (elf->elf_class == ELFCLASS ## B) { \ 280 if (elf->elf_class == ELFCLASS ## B) { \
227 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 281 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
228 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 282 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
229 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 283 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
231 char *symname; \ 285 char *symname; \
232 for (i = 0; i < cnt; ++i) { \ 286 for (i = 0; i < cnt; ++i) { \
233 if (sym->st_name) { \ 287 if (sym->st_name) { \
234 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 288 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
235 if (*find_sym == '*') { \ 289 if (*find_sym == '*') { \
236 printf("%s(%s) %5lX %15s %s\n", ((found_sym == 0) ? "\n\t" : "\t"), \ 290 printf("%s(%s) %5lX %15s %s\n", \
291 ((*found_sym == 0) ? "\n\t" : "\t"), \
237 (char *) basename(filename), \ 292 (char *)basename(filename), \
238 (long)sym->st_size, (char *) get_elfstttype(sym->st_info & 0xF), \ 293 (long)sym->st_size, \
239 symname); \ 294 (char *)get_elfstttype(sym->st_info), \
295 symname); \
240 found_sym = 1; \ 296 *found_sym = 1; \
241 } \
242 if ((strcmp(find_sym, symname) == 0) || \ 297 } else if ((strcmp(find_sym, symname) == 0) || \
243 (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) \ 298 (strcmp(symname, versioned_symname) == 0)) \
244 found_sym++; \ 299 (*found_sym)++; \
245 } \ 300 } \
246 ++sym; \ 301 ++sym; \
247 } } 302 } }
248 FIND_SYM(32) 303 FIND_SYM(32)
249 FIND_SYM(64) 304 FIND_SYM(64)
305 }
306 if (*find_sym != '*' && *found_sym)
307 return find_sym;
308 if (be_quiet)
309 return NULL;
310 else
311 return " - ";
312}
313/* scan an elf file and show all the fun stuff */
314#define prints(str) fputs(str, stdout)
315static void scanelf_file(const char *filename)
316{
317 int i;
318 char found_pax, found_stack, found_relro, found_textrel,
319 found_rpath, found_needed, found_interp, found_sym,
320 found_file;
321 elfobj *elf;
322 struct stat st;
323 static char *out_buffer = NULL;
324 static size_t out_len;
325
326 /* make sure 'filename' exists */
327 if (lstat(filename, &st) == -1) {
328 if (be_verbose > 2) printf("%s: does not exist\n", filename);
329 return;
330 }
331 /* always handle regular files and handle symlinked files if no -y */
332 if (!(S_ISREG(st.st_mode) || (S_ISLNK(st.st_mode) && scan_symlink))) {
333 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
334 return;
335 }
336
337 found_pax = found_stack = found_relro = found_textrel = \
338 found_rpath = found_needed = found_interp = found_sym = \
339 found_file = 0;
340
341 /* verify this is real ELF */
342 if ((elf = readelf(filename)) == NULL) {
343 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
344 return;
345 }
346
347 if (be_verbose > 1)
348 printf("%s: scanning file {%s,%s}\n", filename,
349 get_elfeitype(elf, EI_CLASS, elf->elf_class),
350 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
351 else if (be_verbose)
352 printf("%s: scanning file\n", filename);
353
354 /* init output buffer */
355 if (!out_buffer) {
356 out_len = sizeof(char) * 80;
357 out_buffer = (char*)xmalloc(out_len);
358 }
359 *out_buffer = '\0';
360
361 /* show the header */
362 if (!be_quiet && show_banner) {
363 for (i=0; out_format[i]; ++i) {
364 if (out_format[i] != '%') continue;
365
366 switch (out_format[++i]) {
367 case '%': break;
368 case 'F': prints("FILE "); break;
369 case 'o': prints(" TYPE "); break;
370 case 'x': prints(" PAX "); break;
371 case 'e': prints("STK/REL "); break;
372 case 't': prints("TEXTREL "); break;
373 case 'r': prints("RPATH "); break;
374 case 'n': prints("NEEDED "); break;
375 case 'i': prints("INTERP "); break;
376 case 's': prints("SYM "); break;
250 } 377 }
251 free(versioned_symname);
252 if (*find_sym != '*')
253 printf(" %s ", (found_sym == 0) ? "-" : find_sym);
254 } 378 }
379 prints("\n");
380 show_banner = 0;
381 }
255 382
383 /* dump all the good stuff */
384 for (i=0; out_format[i]; ++i) {
385 const char *out;
386
387 /* make sure we trim leading spaces in quiet mode */
388 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
389 *out_buffer = '\0';
390
391 if (out_format[i] != '%') {
392 xchrcat(&out_buffer, out_format[i], &out_len);
393 continue;
394 }
395
396 out = NULL;
397 switch (out_format[++i]) {
398 case '%': xchrcat(&out_buffer, '%', &out_len); break;
399 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
400 case 'o': out = get_elfetype(elf); break;
401 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
402 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
403 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
404 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
405 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
406 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
407 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
408 }
409 if (out) xstrcat(&out_buffer, out, &out_len);
410 }
411
412 if (!found_file) {
256 if (!be_quiet || found_pax || found_stack || found_textrel || found_rpath) 413 if (!be_quiet || found_pax || found_stack || found_textrel || \
257 printf("%s\n", filename); 414 found_rpath || found_needed || found_interp || found_sym)
415 xstrcat(&out_buffer, filename, &out_len);
416 }
417 if (!(be_quiet && xemptybuffer(out_buffer)))
418 puts(out_buffer);
258 419
259 unreadelf(elf); 420 unreadelf(elf);
260} 421}
261 422
262/* scan a directory for ET_EXEC files and print when we find one */ 423/* scan a directory for ET_EXEC files and print when we find one */
264{ 425{
265 register DIR *dir; 426 register DIR *dir;
266 register struct dirent *dentry; 427 register struct dirent *dentry;
267 struct stat st_top, st; 428 struct stat st_top, st;
268 char buf[_POSIX_PATH_MAX]; 429 char buf[_POSIX_PATH_MAX];
269 size_t len = 0; 430 size_t pathlen = 0, len = 0;
270 431
271 /* make sure path exists */ 432 /* make sure path exists */
272 if (lstat(path, &st_top) == -1) 433 if (lstat(path, &st_top) == -1) {
434 if (be_verbose > 2) printf("%s: does not exist\n", path);
273 return; 435 return;
436 }
274 437
275 /* ok, if it isn't a directory, assume we can open it */ 438 /* ok, if it isn't a directory, assume we can open it */
276 if (!S_ISDIR(st_top.st_mode)) { 439 if (!S_ISDIR(st_top.st_mode)) {
277 scanelf_file(path); 440 scanelf_file(path);
278 return; 441 return;
283 warnf("could not opendir %s: %s", path, strerror(errno)); 446 warnf("could not opendir %s: %s", path, strerror(errno));
284 return; 447 return;
285 } 448 }
286 if (be_verbose) printf("%s: scanning dir\n", path); 449 if (be_verbose) printf("%s: scanning dir\n", path);
287 450
451 pathlen = strlen(path);
288 while ((dentry = readdir(dir))) { 452 while ((dentry = readdir(dir))) {
289 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, "..")) 453 if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
290 continue; 454 continue;
291 len = (strlen(path) + 2 + strlen(dentry->d_name)); 455 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
292 assert(len < sizeof(buf)); 456 if (len >= sizeof(buf)) {
293 strncpy(buf, path, len); 457 warnf("Skipping '%s': len > sizeof(buf); %d > %d\n", path, (int)len, (int)sizeof(buf));
294 strncat(buf, "/", len); 458 continue;
295 strncat(buf, dentry->d_name, len); 459 }
296 buf[sizeof(buf)] = 0; 460 sprintf(buf, "%s/%s", path, dentry->d_name);
297 if (lstat(buf, &st) != -1) { 461 if (lstat(buf, &st) != -1) {
298 if (S_ISREG(st.st_mode)) 462 if (S_ISREG(st.st_mode))
299 scanelf_file(buf); 463 scanelf_file(buf);
300 else if (dir_recurse && S_ISDIR(st.st_mode)) { 464 else if (dir_recurse && S_ISDIR(st.st_mode)) {
301 if (dir_crossmount || (st_top.st_dev == st.st_dev)) 465 if (dir_crossmount || (st_top.st_dev == st.st_dev))
316 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 480 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
317 err("Unable to open ld.so.conf: %s", strerror(errno)); 481 err("Unable to open ld.so.conf: %s", strerror(errno));
318 482
319 scan_l = scan_ul = scan_ull = 0; 483 scan_l = scan_ul = scan_ull = 0;
320 484
321 path = malloc(_POSIX_PATH_MAX); 485 path = (char*)xmalloc(_POSIX_PATH_MAX);
322 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 486 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
323 if (*path == '/') { 487 if (*path == '/') {
324 if ((p = strrchr(path, '\r')) != NULL) 488 if ((p = strrchr(path, '\r')) != NULL)
325 *p = 0; 489 *p = 0;
326 if ((p = strrchr(path, '\n')) != NULL) 490 if ((p = strrchr(path, '\n')) != NULL)
329 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1; 493 if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1;
330 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1; 494 if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
331 scanelf_dir(path); 495 scanelf_dir(path);
332 } 496 }
333 free(path); 497 free(path);
498 fclose(fp);
334 499
335 if (!scan_l) scanelf_dir("/lib"); 500 if (!scan_l) scanelf_dir("/lib");
336 if (!scan_ul) scanelf_dir("/usr/lib"); 501 if (!scan_ul) scanelf_dir("/usr/lib");
337 if (!scan_ull) scanelf_dir("/usr/local/lib"); 502 if (!scan_ull) scanelf_dir("/usr/local/lib");
338
339 fclose(fp);
340} 503}
341 504
342/* scan env PATH for paths */ 505/* scan env PATH for paths */
343static void scanelf_envpath() 506static void scanelf_envpath()
344{ 507{
345 char *path, *p; 508 char *path, *p;
346 509
347 path = getenv("PATH"); 510 path = getenv("PATH");
348 if (!path) 511 if (!path)
349 err("PATH is not set in your env !"); 512 err("PATH is not set in your env !");
350 513 path = xstrdup(path);
351 if ((path = strdup(path)) == NULL)
352 err("stdup failed: %s", strerror(errno));
353 514
354 while ((p = strrchr(path, ':')) != NULL) { 515 while ((p = strrchr(path, ':')) != NULL) {
355 scanelf_dir(p + 1); 516 scanelf_dir(p + 1);
356 *p = 0; 517 *p = 0;
357 } 518 }
360} 521}
361 522
362 523
363 524
364/* usage / invocation handling functions */ 525/* usage / invocation handling functions */
365#define PARSE_FLAGS "plRmxetrs:aqvo:BhV" 526#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV"
366#define a_argument required_argument 527#define a_argument required_argument
367static struct option const long_opts[] = { 528static struct option const long_opts[] = {
368 {"path", no_argument, NULL, 'p'}, 529 {"path", no_argument, NULL, 'p'},
369 {"ldpath", no_argument, NULL, 'l'}, 530 {"ldpath", no_argument, NULL, 'l'},
370 {"recursive", no_argument, NULL, 'R'}, 531 {"recursive", no_argument, NULL, 'R'},
371 {"mount", no_argument, NULL, 'm'}, 532 {"mount", no_argument, NULL, 'm'},
533 {"symlink", no_argument, NULL, 'y'},
372 {"pax", no_argument, NULL, 'x'}, 534 {"pax", no_argument, NULL, 'x'},
373 {"header", no_argument, NULL, 'e'}, 535 {"header", no_argument, NULL, 'e'},
374 {"textrel", no_argument, NULL, 't'}, 536 {"textrel", no_argument, NULL, 't'},
375 {"rpath", no_argument, NULL, 'r'}, 537 {"rpath", no_argument, NULL, 'r'},
538 {"needed", no_argument, NULL, 'n'},
539 {"interp", no_argument, NULL, 'i'},
376 {"symbol", a_argument, NULL, 's'}, 540 {"symbol", a_argument, NULL, 's'},
377 {"all", no_argument, NULL, 'a'}, 541 {"all", no_argument, NULL, 'a'},
378 {"quiet", no_argument, NULL, 'q'}, 542 {"quiet", no_argument, NULL, 'q'},
379 {"verbose", no_argument, NULL, 'v'}, 543 {"verbose", no_argument, NULL, 'v'},
544 {"format", a_argument, NULL, 'F'},
380 {"file", a_argument, NULL, 'o'}, 545 {"file", a_argument, NULL, 'o'},
381 {"nobanner", no_argument, NULL, 'B'}, 546 {"nobanner", no_argument, NULL, 'B'},
382 {"help", no_argument, NULL, 'h'}, 547 {"help", no_argument, NULL, 'h'},
383 {"version", no_argument, NULL, 'V'}, 548 {"version", no_argument, NULL, 'V'},
384 {NULL, no_argument, NULL, 0x0} 549 {NULL, no_argument, NULL, 0x0}
385}; 550};
386static char *opts_help[] = { 551static char *opts_help[] = {
387 "Scan all directories in PATH environment", 552 "Scan all directories in PATH environment",
388 "Scan all directories in /etc/ld.so.conf", 553 "Scan all directories in /etc/ld.so.conf",
389 "Scan directories recursively", 554 "Scan directories recursively",
390 "Don't recursively cross mount points\n", 555 "Don't recursively cross mount points",
556 "Don't scan symlinks\n",
391 "Print PaX markings", 557 "Print PaX markings",
392 "Print GNU_STACK markings", 558 "Print GNU_STACK markings",
393 "Print TEXTREL information", 559 "Print TEXTREL information",
394 "Print RPATH information", 560 "Print RPATH information",
561 "Print NEEDED information",
562 "Print INTERP information",
395 "Find a specified symbol", 563 "Find a specified symbol",
396 "Print all scanned info (-x -e -t -r)\n", 564 "Print all scanned info (-x -e -t -r)\n",
397 "Only output 'bad' things", 565 "Only output 'bad' things",
398 "Be verbose (can be specified more than once)", 566 "Be verbose (can be specified more than once)",
567 "Use specified format for output",
399 "Write output stream to a filename", 568 "Write output stream to a filename",
400 "Don't display the header", 569 "Don't display the header",
401 "Print this help and exit", 570 "Print this help and exit",
402 "Print version and exit", 571 "Print version and exit",
403 NULL 572 NULL
405 574
406/* display usage and exit */ 575/* display usage and exit */
407static void usage(int status) 576static void usage(int status)
408{ 577{
409 int i; 578 int i;
410 printf(" Scan ELF binaries for stuff\n" 579 printf(" Scan ELF binaries for stuff\n\n"
411 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 580 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
412 printf("Options:\n"); 581 printf("Options: -[%s]\n", PARSE_FLAGS);
413 for (i = 0; long_opts[i].name; ++i) 582 for (i = 0; long_opts[i].name; ++i)
414 if (long_opts[i].has_arg == no_argument) 583 if (long_opts[i].has_arg == no_argument)
415 printf(" -%c, --%-13s %s\n", long_opts[i].val, 584 printf(" -%c, --%-13s %s\n", long_opts[i].val,
416 long_opts[i].name, opts_help[i]); 585 long_opts[i].name, opts_help[i]);
417 else 586 else
427 596
428 opterr = 0; 597 opterr = 0;
429 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) { 598 while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
430 switch (flag) { 599 switch (flag) {
431 600
432 case 'V': /* version info */ 601 case 'V':
433 printf("%s compiled %s\n%s\n" 602 printf("%s compiled %s\n%s\n"
434 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n", 603 "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
435 __FILE__, __DATE__, rcsid, argv0); 604 __FILE__, __DATE__, rcsid, argv0);
436 exit(EXIT_SUCCESS); 605 exit(EXIT_SUCCESS);
437 break; 606 break;
444 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 613 err("Could not open output stream '%s': %s", optarg, strerror(errno));
445 stdout = fp; 614 stdout = fp;
446 break; 615 break;
447 } 616 }
448 617
449 case 's': find_sym = strdup(optarg); break; 618 case 's': {
619 size_t len;
620 find_sym = xstrdup(optarg);
621 len = strlen(find_sym) + 1;
622 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
623 sprintf(versioned_symname, "%s@", find_sym);
624 break;
625 }
450 626
627 case 'F': {
628 out_format = strdup(optarg);
629 break;
630 }
631
632 case 'y': scan_symlink = 0; break;
451 case 'B': show_banner = 0; break; 633 case 'B': show_banner = 0; break;
452 case 'l': scan_ldpath = 1; break; 634 case 'l': scan_ldpath = 1; break;
453 case 'p': scan_envpath = 1; break; 635 case 'p': scan_envpath = 1; break;
454 case 'R': dir_recurse = 1; break; 636 case 'R': dir_recurse = 1; break;
455 case 'm': dir_crossmount = 0; break; 637 case 'm': dir_crossmount = 0; break;
456 case 'x': show_pax = 1; break; 638 case 'x': show_pax = 1; break;
457 case 'e': show_stack = 1; break; 639 case 'e': show_stack = 1; break;
458 case 't': show_textrel = 1; break; 640 case 't': show_textrel = 1; break;
459 case 'r': show_rpath = 1; break; 641 case 'r': show_rpath = 1; break;
642 case 'n': show_needed = 1; break;
643 case 'i': show_interp = 1; break;
460 case 'q': be_quiet = 1; break; 644 case 'q': be_quiet = 1; break;
461 case 'v': be_verbose = (be_verbose % 20) + 1; break; 645 case 'v': be_verbose = (be_verbose % 20) + 1; break;
462 case 'a': show_pax = show_stack = show_textrel = show_rpath = 1; break; 646 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break;
463 647
464 case ':': 648 case ':':
465 warn("Option missing parameter"); 649 warn("Option missing parameter\n");
466 usage(EXIT_FAILURE); 650 usage(EXIT_FAILURE);
467 break; 651 break;
468 case '?': 652 case '?':
469 warn("Unknown option"); 653 warn("Unknown option\n");
470 usage(EXIT_FAILURE); 654 usage(EXIT_FAILURE);
471 break; 655 break;
472 default: 656 default:
473 err("Unhandled option '%c'", flag); 657 err("Unhandled option '%c'", flag);
474 break; 658 break;
476 } 660 }
477 661
478 if (be_quiet && be_verbose) 662 if (be_quiet && be_verbose)
479 err("You can be quiet or you can be verbose, not both, stupid"); 663 err("You can be quiet or you can be verbose, not both, stupid");
480 664
665 /* let the format option override all other options */
666 if (out_format) {
667 show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 0;
668 for (flag=0; out_format[flag]; ++flag) {
669 if (out_format[flag] != '%') continue;
670
671 switch (out_format[++flag]) {
672 case '%': break;
673 case 'F': break;
674 case 's': break;
675 case 'o': break;
676 case 'x': show_pax = 1; break;
677 case 'e': show_stack = 1; break;
678 case 't': show_textrel = 1; break;
679 case 'r': show_rpath = 1; break;
680 case 'n': show_needed = 1; break;
681 case 'i': show_interp = 1; break;
682 default:
683 err("Invalid format specifier '%c' (byte %i)",
684 out_format[flag], flag+1);
685 }
686 }
687
688 /* construct our default format */
689 } else {
690 size_t fmt_len = 30;
691 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
692 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
693 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
694 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
695 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
696 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
697 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
698 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
699 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
700 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
701 }
702 if (be_verbose > 2) printf("Format: %s\n", out_format);
703
704 /* now lets actually do the scanning */
481 if (scan_ldpath) scanelf_ldpath(); 705 if (scan_ldpath) scanelf_ldpath();
482 if (scan_envpath) scanelf_envpath(); 706 if (scan_envpath) scanelf_envpath();
483 if (optind == argc && !scan_ldpath && !scan_envpath) 707 if (optind == argc && !scan_ldpath && !scan_envpath)
484 err("Nothing to scan !?"); 708 err("Nothing to scan !?");
485 while (optind < argc) 709 while (optind < argc)
486 scanelf_dir(argv[optind++]); 710 scanelf_dir(argv[optind++]);
487 711
488 if (find_sym) free(find_sym); 712 /* clean up */
713 if (find_sym) {
714 free(find_sym);
715 free(versioned_symname);
716 }
717 if (out_format) free(out_format);
718}
719
720
721
722/* utility funcs */
723static char *xstrdup(char *s)
724{
725 char *ret = strdup(s);
726 if (!ret) err("Could not strdup(): %s", strerror(errno));
727 return ret;
728}
729static void *xmalloc(size_t size)
730{
731 void *ret = malloc(size);
732 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
733 return ret;
734}
735static void xstrcat(char **dst, const char *src, size_t *curr_len)
736{
737 long new_len;
738
739 new_len = strlen(*dst) + strlen(src);
740 if (*curr_len <= new_len) {
741 *curr_len = new_len + (*curr_len / 2);
742 *dst = realloc(*dst, *curr_len);
743 if (!*dst)
744 err("could not realloc %li bytes", (unsigned long)*curr_len);
745 }
746
747 strcat(*dst, src);
748}
749static inline void xchrcat(char **dst, const char append, size_t *curr_len)
750{
751 static char my_app[2];
752 my_app[0] = append;
753 my_app[1] = '\0';
754 xstrcat(dst, my_app, curr_len);
755}
756static int xemptybuffer(const char *buff)
757{
758 long i;
759 for (i=0; buff[i]; ++i)
760 if (buff[i] != ' ')
761 return 0;
762 return 1;
489} 763}
490 764
491 765
492 766
493int main(int argc, char *argv[]) 767int main(int argc, char *argv[])

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