/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.40 Revision 1.44
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 1.40 2005/04/21 00:13:03 solar Exp $ 5 * $Header: /var/cvsroot/gentoo-projects/pax-utils/Attic/scanelf.c,v 1.44 2005/05/10 22:54:25 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 1.40 2005/04/21 00:13:03 solar Exp $"; 38static const char *rcsid = "$Id: scanelf.c,v 1.44 2005/05/10 22:54:25 vapier Exp $";
39#define argv0 "scanelf" 39#define argv0 "scanelf"
40 40
41 41
42 42
43/* prototypes */ 43/* prototypes */
45static void scanelf_dir(const char *path); 45static void scanelf_dir(const char *path);
46static void scanelf_ldpath(); 46static void scanelf_ldpath();
47static void scanelf_envpath(); 47static void scanelf_envpath();
48static void usage(int status); 48static void usage(int status);
49static 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);
50 55
51/* variables to control behavior */ 56/* variables to control behavior */
52static char scan_ldpath = 0; 57static char scan_ldpath = 0;
53static char scan_envpath = 0; 58static char scan_envpath = 0;
54static char scan_symlink = 1; 59static char scan_symlink = 1;
67static char *out_format = NULL; 72static char *out_format = NULL;
68 73
69 74
70 75
71/* sub-funcs for scanelf_file() */ 76/* sub-funcs for scanelf_file() */
72static void scanelf_file_pax(elfobj *elf, char *found_pax) 77static char *scanelf_file_pax(elfobj *elf, char *found_pax)
73{ 78{
74 char *paxflags; 79 static char *paxflags;
80
75 if (!show_pax) return; 81 if (!show_pax) return NULL;
76 82
77 paxflags = pax_short_hf_flags(PAX_FLAGS(elf)); 83 paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
78 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) { 84 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
79 *found_pax = 1; 85 *found_pax = 1;
80 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf))); 86 return paxflags;
81 } 87 }
88
89 return NULL;
82} 90}
83static void scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro) 91static char *scanelf_file_stack(elfobj *elf, char *found_stack, char *found_relro)
84{ 92{
85 int i; 93 static char ret[8];
94 char *found;
95 unsigned long i, off, shown;
96
86 if (!show_stack) return; 97 if (!show_stack) return NULL;
98
99 shown = 0;
100 strcpy(ret, "--- ---");
101
102 if (elf->phdr) {
87#define SHOW_STACK(B) \ 103#define SHOW_STACK(B) \
88 if (elf->elf_class == ELFCLASS ## B) { \ 104 if (elf->elf_class == ELFCLASS ## B) { \
89 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 105 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
90 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 106 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
91 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 107 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
92 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 108 if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
109 found = found_stack; \
110 off = 0; \
93 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \ 111 } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
112 found = found_relro; \
113 off = 3; \
114 } else \
115 continue; \
94 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 116 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
95 continue; \ 117 continue; \
96 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \
97 *found_stack = 1; \
98 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \
99 *found_relro = 1; \
100 printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \ 118 memcpy(ret+off, gnu_short_stack_flags(EGET(phdr[i].p_flags)), 3); \
119 *found = 1; \
120 ++shown; \
101 } \ 121 } \
102 } 122 }
103 SHOW_STACK(32) 123 SHOW_STACK(32)
104 SHOW_STACK(64) 124 SHOW_STACK(64)
105 if (!be_quiet && !*found_stack) printf("--- "); 125 }
106 if (!be_quiet && !*found_relro) printf("--- "); 126
127 if (be_quiet && !shown)
128 return NULL;
129 else
130 return ret;
107} 131}
108static void scanelf_file_textrel(elfobj *elf, char *found_textrel) 132static char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
109{ 133{
110 int i; 134 static char *ret = "TEXTREL";
135 unsigned long i;
136
111 if (!show_textrel) return; 137 if (!show_textrel) return NULL;
138
139 if (elf->phdr) {
112#define SHOW_TEXTREL(B) \ 140#define SHOW_TEXTREL(B) \
113 if (elf->elf_class == ELFCLASS ## B) { \ 141 if (elf->elf_class == ELFCLASS ## B) { \
114 Elf ## B ## _Dyn *dyn; \ 142 Elf ## B ## _Dyn *dyn; \
115 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 143 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
116 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 144 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
145 Elf ## B ## _Off offset; \
117 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 146 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
118 if (phdr[i].p_type != PT_DYNAMIC) continue; \ 147 if (phdr[i].p_type != PT_DYNAMIC) continue; \
148 offset = EGET(phdr[i].p_offset); \
149 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
119 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 150 dyn = DYN ## B (elf->data + offset); \
120 while (EGET(dyn->d_tag) != DT_NULL) { \ 151 while (EGET(dyn->d_tag) != DT_NULL) { \
121 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \ 152 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
122 *found_textrel = 1; \ 153 *found_textrel = 1; \
123 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \ 154 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
124 printf("TEXTREL "); \ 155 return ret; \
125 } \ 156 } \
126 ++dyn; \ 157 ++dyn; \
127 } \ 158 } \
128 } } 159 } }
129 SHOW_TEXTREL(32) 160 SHOW_TEXTREL(32)
130 SHOW_TEXTREL(64) 161 SHOW_TEXTREL(64)
131 if (!be_quiet && !*found_textrel) printf("------- "); 162 }
163
164 if (be_quiet)
165 return NULL;
166 else
167 return " - ";
132} 168}
133static void scanelf_file_rpath(elfobj *elf, char *found_rpath) 169static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
134{ 170{
135 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */ 171 /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
136 int i; 172 unsigned long i;
137 char *rpath, *runpath; 173 char *rpath, *runpath;
138 void *strtbl_void; 174 void *strtbl_void;
139 175
140 if (!show_rpath) return; 176 if (!show_rpath) return;
141 177
142 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 178 strtbl_void = elf_findsecbyname(elf, ".dynstr");
143 rpath = runpath = NULL; 179 rpath = runpath = NULL;
144 180
145 if (strtbl_void) { 181 if (elf->phdr && strtbl_void) {
146#define SHOW_RPATH(B) \ 182#define SHOW_RPATH(B) \
147 if (elf->elf_class == ELFCLASS ## B) { \ 183 if (elf->elf_class == ELFCLASS ## B) { \
148 Elf ## B ## _Dyn *dyn; \ 184 Elf ## B ## _Dyn *dyn; \
149 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 185 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
150 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 186 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
151 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 187 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
188 Elf ## B ## _Off offset; \
152 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
153 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
191 offset = EGET(phdr[i].p_offset); \
192 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
154 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 193 dyn = DYN ## B (elf->data + offset); \
155 while (EGET(dyn->d_tag) != DT_NULL) { \ 194 while (EGET(dyn->d_tag) != DT_NULL) { \
156 if (EGET(dyn->d_tag) == DT_RPATH) { \ 195 if (EGET(dyn->d_tag) == DT_RPATH) { \
196 if (rpath) warn("ELF has multiple DT_RPATH's !?"); \
157 rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 197 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
198 if (offset >= elf->len) continue; \
199 rpath = (char*)(elf->data + offset); \
158 *found_rpath = 1; \ 200 *found_rpath = 1; \
159 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \ 201 } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
202 if (runpath) warn("ELF has multiple DT_RUNPATH's !?"); \
160 runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 203 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 if (offset >= elf->len) continue; \
205 runpath = (char*)(elf->data + offset); \
161 *found_rpath = 1; \ 206 *found_rpath = 1; \
162 } \ 207 } \
163 ++dyn; \ 208 ++dyn; \
164 } \ 209 } \
165 } } 210 } }
166 SHOW_RPATH(32) 211 SHOW_RPATH(32)
167 SHOW_RPATH(64) 212 SHOW_RPATH(64)
168 } 213 }
214
169 if (rpath && runpath) { 215 if (rpath && runpath) {
170 if (!strcmp(rpath, runpath)) 216 if (!strcmp(rpath, runpath)) {
171 printf("%-5s ", runpath); 217 xstrcat(ret, runpath, ret_len);
172 else { 218 } else {
173 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath); 219 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
174 printf("{%s,%s} ", rpath, runpath); 220 xchrcat(ret, '{', ret_len);
221 xstrcat(ret, rpath, ret_len);
222 xchrcat(ret, ',', ret_len);
223 xstrcat(ret, runpath, ret_len);
224 xchrcat(ret, '}', ret_len);
175 } 225 }
176 } else if (rpath || runpath) 226 } else if (rpath || runpath)
177 printf("%-5s ", (runpath ? runpath : rpath)); 227 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
178 else if (!be_quiet && !*found_rpath) 228 else if (!be_quiet)
179 printf(" - "); 229 xstrcat(ret, " - ", ret_len);
180} 230}
181static void scanelf_file_needed(elfobj *elf, char *found_needed) 231static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
182{ 232{
183 int i; 233 unsigned long i;
184 char *needed; 234 char *needed;
185 void *strtbl_void; 235 void *strtbl_void;
186 236
187 if (!show_needed) return; 237 if (!show_needed) return;
188 238
189 strtbl_void = elf_findsecbyname(elf, ".dynstr"); 239 strtbl_void = elf_findsecbyname(elf, ".dynstr");
190 240
191 if (strtbl_void) { 241 if (elf->phdr && strtbl_void) {
192#define SHOW_NEEDED(B) \ 242#define SHOW_NEEDED(B) \
193 if (elf->elf_class == ELFCLASS ## B) { \ 243 if (elf->elf_class == ELFCLASS ## B) { \
194 Elf ## B ## _Dyn *dyn; \ 244 Elf ## B ## _Dyn *dyn; \
195 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 245 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
196 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 246 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
197 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 247 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
248 Elf ## B ## _Off offset; \
198 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 249 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
199 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 250 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
251 offset = EGET(phdr[i].p_offset); \
252 if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
200 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 253 dyn = DYN ## B (elf->data + offset); \
201 while (EGET(dyn->d_tag) != DT_NULL) { \ 254 while (EGET(dyn->d_tag) != DT_NULL) { \
202 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 255 if (EGET(dyn->d_tag) == DT_NEEDED) { \
203 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 256 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
204 if (*found_needed) printf(","); \ 257 if (offset >= elf->len) continue; \
205 printf("%s", needed); \ 258 needed = (char*)(elf->data + offset); \
259 if (*found_needed) xchrcat(ret, ',', ret_len); \
260 xstrcat(ret, needed, ret_len); \
206 *found_needed = 1; \ 261 *found_needed = 1; \
207 } \ 262 } \
208 ++dyn; \ 263 ++dyn; \
209 } \ 264 } \
210 } } 265 } }
211 SHOW_NEEDED(32) 266 SHOW_NEEDED(32)
212 SHOW_NEEDED(64) 267 SHOW_NEEDED(64)
213 } 268 }
214 if (!be_quiet && !*found_needed)
215 printf(" - ");
216 else if (*found_needed)
217 printf(" ");
218} 269}
219static void scanelf_file_interp(elfobj *elf, char *found_interp) 270static char *scanelf_file_interp(elfobj *elf, char *found_interp)
220{ 271{
221 void *strtbl_void; 272 void *strtbl_void;
222 273
223 if (!show_interp) return; 274 if (!show_interp) return NULL;
224 275
225 strtbl_void = elf_findsecbyname(elf, ".interp"); 276 strtbl_void = elf_findsecbyname(elf, ".interp");
226 277
227 if (strtbl_void) { 278 if (strtbl_void) {
228#define SHOW_INTERP(B) \ 279#define SHOW_INTERP(B) \
229 if (elf->elf_class == ELFCLASS ## B) { \ 280 if (elf->elf_class == ELFCLASS ## B) { \
230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 281 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
231 printf("%s ", elf->data + EGET(strtbl->sh_offset)); \
232 *found_interp = 1; \ 282 *found_interp = 1; \
283 return elf->data + EGET(strtbl->sh_offset); \
233 } 284 }
234 SHOW_INTERP(32) 285 SHOW_INTERP(32)
235 SHOW_INTERP(64) 286 SHOW_INTERP(64)
236 } 287 }
237 if (!be_quiet && !*found_interp) 288 return NULL;
238 printf(" - ");
239 else if (*found_interp)
240 printf(" ");
241} 289}
242static void scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename) 290static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
243{ 291{
244 int i; 292 unsigned long i;
245 void *symtab_void, *strtab_void; 293 void *symtab_void, *strtab_void;
246 294
247 if (!find_sym) return; 295 if (!find_sym) return NULL;
248 296
249 symtab_void = elf_findsecbyname(elf, ".symtab"); 297 symtab_void = elf_findsecbyname(elf, ".symtab");
250 strtab_void = elf_findsecbyname(elf, ".strtab"); 298 strtab_void = elf_findsecbyname(elf, ".strtab");
251 299
252 if (symtab_void && strtab_void) { 300 if (symtab_void && strtab_void) {
253#define FIND_SYM(B) \ 301#define FIND_SYM(B) \
254 if (elf->elf_class == ELFCLASS ## B) { \ 302 if (elf->elf_class == ELFCLASS ## B) { \
255 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 303 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
256 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 304 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
257 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \ 305 Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
258 int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \ 306 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
259 char *symname; \ 307 char *symname; \
260 for (i = 0; i < cnt; ++i) { \ 308 for (i = 0; i < cnt; ++i) { \
261 if (sym->st_name) { \ 309 if (sym->st_name) { \
262 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \ 310 symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
263 if (*find_sym == '*') { \ 311 if (*find_sym == '*') { \
275 ++sym; \ 323 ++sym; \
276 } } 324 } }
277 FIND_SYM(32) 325 FIND_SYM(32)
278 FIND_SYM(64) 326 FIND_SYM(64)
279 } 327 }
280 if (*find_sym != '*') { 328 if (*find_sym != '*' && *found_sym)
281 if (*found_sym) 329 return find_sym;
282 printf(" %s ", find_sym);
283 else if (!be_quiet) 330 if (be_quiet)
284 printf(" - "); 331 return NULL;
285 } 332 else
333 return " - ";
286} 334}
287/* scan an elf file and show all the fun stuff */ 335/* scan an elf file and show all the fun stuff */
336#define prints(str) fputs(str, stdout)
288static void scanelf_file(const char *filename) 337static void scanelf_file(const char *filename)
289{ 338{
290 int i; 339 unsigned long i;
291 char found_pax, found_stack, found_relro, found_textrel, 340 char found_pax, found_stack, found_relro, found_textrel,
292 found_rpath, found_needed, found_interp, found_sym, 341 found_rpath, found_needed, found_interp, found_sym,
293 found_file; 342 found_file;
294 elfobj *elf; 343 elfobj *elf;
295 struct stat st; 344 struct stat st;
345 static char *out_buffer = NULL;
346 static size_t out_len;
296 347
297 /* make sure 'filename' exists */ 348 /* make sure 'filename' exists */
298 if (lstat(filename, &st) == -1) { 349 if (lstat(filename, &st) == -1) {
299 if (be_verbose > 2) printf("%s: does not exist\n", filename); 350 if (be_verbose > 2) printf("%s: does not exist\n", filename);
300 return; 351 return;
314 if (be_verbose > 2) printf("%s: not an ELF\n", filename); 365 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
315 return; 366 return;
316 } 367 }
317 368
318 if (be_verbose > 1) 369 if (be_verbose > 1)
319 printf("%s: {%s,%s} scanning file\n", filename, 370 printf("%s: scanning file {%s,%s}\n", filename,
320 get_elfeitype(elf, EI_CLASS, elf->elf_class), 371 get_elfeitype(elf, EI_CLASS, elf->elf_class),
321 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA])); 372 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
322 else if (be_verbose) 373 else if (be_verbose)
323 printf("%s: scanning file\n", filename); 374 printf("%s: scanning file\n", filename);
324 375
376 /* init output buffer */
377 if (!out_buffer) {
378 out_len = sizeof(char) * 80;
379 out_buffer = (char*)xmalloc(out_len);
380 }
381 *out_buffer = '\0';
382
325 /* show the header */ 383 /* show the header */
326 if (!be_quiet && show_banner) { 384 if (!be_quiet && show_banner) {
327 if (out_format) {
328 for (i=0; out_format[i]; ++i) { 385 for (i=0; out_format[i]; ++i) {
329 if (out_format[i] != '%') continue; 386 if (out_format[i] != '%') continue;
330 387
331 switch (out_format[++i]) { 388 switch (out_format[++i]) {
332 case '%': break; 389 case '%': break;
333 case 'F': printf("FILE "); break; 390 case 'F': prints("FILE "); break;
391 case 'o': prints(" TYPE "); break;
334 case 'x': printf(" PAX "); break; 392 case 'x': prints(" PAX "); break;
335 case 'e': printf("STK/REL "); break; 393 case 'e': prints("STK/REL "); break;
336 case 't': printf("TEXTREL "); break; 394 case 't': prints("TEXTREL "); break;
337 case 'r': printf("RPATH "); break; 395 case 'r': prints("RPATH "); break;
338 case 'n': printf("NEEDED "); break; 396 case 'n': prints("NEEDED "); break;
339 case 'i': printf("INTERP "); break; 397 case 'i': prints("INTERP "); break;
340 case 's': printf("SYM "); break; 398 case 's': prints("SYM "); break;
341 }
342 } 399 }
343 } else {
344 printf(" TYPE ");
345 if (show_pax) printf(" PAX ");
346 if (show_stack) printf("STK/REL ");
347 if (show_textrel) printf("TEXTREL ");
348 if (show_rpath) printf("RPATH ");
349 if (show_needed) printf("NEEDED ");
350 if (show_interp) printf("INTERP ");
351 if (find_sym) printf("SYM ");
352 } 400 }
353 if (!found_file) printf(" FILE");
354 printf("\n"); 401 prints("\n");
355 show_banner = 0; 402 show_banner = 0;
356 } 403 }
357 404
358 /* dump all the good stuff */ 405 /* dump all the good stuff */
359 if (!be_quiet && !out_format)
360 printf("%-7s ", get_elfetype(elf));
361
362 if (out_format) {
363 for (i=0; out_format[i]; ++i) { 406 for (i=0; out_format[i]; ++i) {
407 const char *out;
408
409 /* make sure we trim leading spaces in quiet mode */
410 if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
411 *out_buffer = '\0';
412
364 if (out_format[i] != '%') { 413 if (out_format[i] != '%') {
365 printf("%c", out_format[i]); 414 xchrcat(&out_buffer, out_format[i], &out_len);
366 continue; 415 continue;
367 } 416 }
368 417
418 out = NULL;
369 switch (out_format[++i]) { 419 switch (out_format[++i]) {
370 case '%': printf("%%"); break; 420 case '%': xchrcat(&out_buffer, '%', &out_len); break;
371 case 'F': found_file = 1; printf("%s ", filename); break; 421 case 'F': found_file = 1; xstrcat(&out_buffer, filename, &out_len); break;
422 case 'o': out = get_elfetype(elf); break;
372 case 'x': scanelf_file_pax(elf, &found_pax); break; 423 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
373 case 'e': scanelf_file_stack(elf, &found_stack, &found_relro); break; 424 case 'e': out = scanelf_file_stack(elf, &found_stack, &found_relro); break;
374 case 't': scanelf_file_textrel(elf, &found_textrel); break; 425 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
375 case 'r': scanelf_file_rpath(elf, &found_rpath); break; 426 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
376 case 'n': scanelf_file_needed(elf, &found_needed); break; 427 case 'n': scanelf_file_needed(elf, &found_needed, &out_buffer, &out_len); break;
377 case 'i': scanelf_file_interp(elf, &found_interp); break; 428 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
378 case 's': scanelf_file_sym(elf, &found_sym, filename); break; 429 case 's': out = scanelf_file_sym(elf, &found_sym, filename); break;
379 } 430 }
380 } 431 if (out) xstrcat(&out_buffer, out, &out_len);
381 } else {
382 scanelf_file_pax(elf, &found_pax);
383 scanelf_file_stack(elf, &found_stack, &found_relro);
384 scanelf_file_textrel(elf, &found_textrel);
385 scanelf_file_rpath(elf, &found_rpath);
386 scanelf_file_needed(elf, &found_needed);
387 scanelf_file_interp(elf, &found_interp);
388 scanelf_file_sym(elf, &found_sym, filename);
389 } 432 }
390 433
391 if (!found_file) { 434 if (!found_file) {
392 if (!be_quiet || found_pax || found_stack || found_textrel || \ 435 if (!be_quiet || found_pax || found_stack || found_textrel || \
393 found_rpath || found_needed || found_sym) 436 found_rpath || found_needed || found_interp || found_sym)
394 puts(filename); 437 xstrcat(&out_buffer, filename, &out_len);
395 } else {
396 printf("\n");
397 } 438 }
439 if (!(be_quiet && xemptybuffer(out_buffer)))
440 puts(out_buffer);
398 441
399 unreadelf(elf); 442 unreadelf(elf);
400} 443}
401 444
402/* scan a directory for ET_EXEC files and print when we find one */ 445/* scan a directory for ET_EXEC files and print when we find one */
459 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 502 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
460 err("Unable to open ld.so.conf: %s", strerror(errno)); 503 err("Unable to open ld.so.conf: %s", strerror(errno));
461 504
462 scan_l = scan_ul = scan_ull = 0; 505 scan_l = scan_ul = scan_ull = 0;
463 506
464 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) { 507 path = (char*)xmalloc(_POSIX_PATH_MAX);
465 warn("Can not malloc() memory for ldpath scanning");
466 return;
467 }
468 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 508 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
469 if (*path == '/') { 509 if (*path == '/') {
470 if ((p = strrchr(path, '\r')) != NULL) 510 if ((p = strrchr(path, '\r')) != NULL)
471 *p = 0; 511 *p = 0;
472 if ((p = strrchr(path, '\n')) != NULL) 512 if ((p = strrchr(path, '\n')) != NULL)
490 char *path, *p; 530 char *path, *p;
491 531
492 path = getenv("PATH"); 532 path = getenv("PATH");
493 if (!path) 533 if (!path)
494 err("PATH is not set in your env !"); 534 err("PATH is not set in your env !");
495 535 path = xstrdup(path);
496 if ((path = strdup(path)) == NULL)
497 err("strdup failed: %s", strerror(errno));
498 536
499 while ((p = strrchr(path, ':')) != NULL) { 537 while ((p = strrchr(path, ':')) != NULL) {
500 scanelf_dir(p + 1); 538 scanelf_dir(p + 1);
501 *p = 0; 539 *p = 0;
502 } 540 }
557}; 595};
558 596
559/* display usage and exit */ 597/* display usage and exit */
560static void usage(int status) 598static void usage(int status)
561{ 599{
562 int i; 600 unsigned long i;
563 printf(" Scan ELF binaries for stuff\n\n" 601 printf(" Scan ELF binaries for stuff\n\n"
564 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 602 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
565 printf("Options: -[%s]\n", PARSE_FLAGS); 603 printf("Options: -[%s]\n", PARSE_FLAGS);
566 for (i = 0; long_opts[i].name; ++i) 604 for (i = 0; long_opts[i].name; ++i)
567 if (long_opts[i].has_arg == no_argument) 605 if (long_opts[i].has_arg == no_argument)
599 break; 637 break;
600 } 638 }
601 639
602 case 's': { 640 case 's': {
603 size_t len; 641 size_t len;
604 find_sym = strdup(optarg); 642 find_sym = xstrdup(optarg);
605 if (!find_sym) {
606 warnf("Could not malloc() mem for sym scan");
607 find_sym = NULL;
608 break;
609 }
610 len = strlen(find_sym) + 1; 643 len = strlen(find_sym) + 1;
611 versioned_symname = (char *)malloc(sizeof(char) * (len+1)); 644 versioned_symname = (char*)xmalloc(sizeof(char) * (len+1));
612 if (!versioned_symname) {
613 free(find_sym);
614 find_sym = NULL;
615 warnf("Could not malloc() mem for sym scan");
616 break;
617 }
618 sprintf(versioned_symname, "%s@", find_sym); 645 sprintf(versioned_symname, "%s@", find_sym);
619 break; 646 break;
620 } 647 }
621 648
622 case 'F': { 649 case 'F': {
623 out_format = strdup(optarg); 650 out_format = strdup(optarg);
624 if (!out_format)
625 err("Could not malloc() mem for output format");
626 break; 651 break;
627 } 652 }
628 653
629 case 'y': scan_symlink = 0; break; 654 case 'y': scan_symlink = 0; break;
630 case 'B': show_banner = 0; break; 655 case 'B': show_banner = 0; break;
667 692
668 switch (out_format[++flag]) { 693 switch (out_format[++flag]) {
669 case '%': break; 694 case '%': break;
670 case 'F': break; 695 case 'F': break;
671 case 's': break; 696 case 's': break;
697 case 'o': break;
672 case 'x': show_pax = 1; break; 698 case 'x': show_pax = 1; break;
673 case 'e': show_stack = 1; break; 699 case 'e': show_stack = 1; break;
674 case 't': show_textrel = 1; break; 700 case 't': show_textrel = 1; break;
675 case 'r': show_rpath = 1; break; 701 case 'r': show_rpath = 1; break;
676 case 'n': show_needed = 1; break; 702 case 'n': show_needed = 1; break;
678 default: 704 default:
679 err("Invalid format specifier '%c' (byte %i)", 705 err("Invalid format specifier '%c' (byte %i)",
680 out_format[flag], flag+1); 706 out_format[flag], flag+1);
681 } 707 }
682 } 708 }
709
710 /* construct our default format */
711 } else {
712 size_t fmt_len = 30;
713 out_format = (char*)xmalloc(sizeof(char) * fmt_len);
714 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
715 if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
716 if (show_stack) xstrcat(&out_format, "%e ", &fmt_len);
717 if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
718 if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
719 if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
720 if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
721 if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
722 if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
683 } 723 }
724 if (be_verbose > 2) printf("Format: %s\n", out_format);
684 725
685 /* now lets actually do the scanning */ 726 /* now lets actually do the scanning */
686 if (scan_ldpath) scanelf_ldpath(); 727 if (scan_ldpath) scanelf_ldpath();
687 if (scan_envpath) scanelf_envpath(); 728 if (scan_envpath) scanelf_envpath();
688 if (optind == argc && !scan_ldpath && !scan_envpath) 729 if (optind == argc && !scan_ldpath && !scan_envpath)
698 if (out_format) free(out_format); 739 if (out_format) free(out_format);
699} 740}
700 741
701 742
702 743
744/* utility funcs */
745static char *xstrdup(char *s)
746{
747 char *ret = strdup(s);
748 if (!ret) err("Could not strdup(): %s", strerror(errno));
749 return ret;
750}
751static void *xmalloc(size_t size)
752{
753 void *ret = malloc(size);
754 if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
755 return ret;
756}
757static void xstrcat(char **dst, const char *src, size_t *curr_len)
758{
759 long new_len;
760
761 new_len = strlen(*dst) + strlen(src);
762 if (*curr_len <= new_len) {
763 *curr_len = new_len + (*curr_len / 2);
764 *dst = realloc(*dst, *curr_len);
765 if (!*dst)
766 err("could not realloc %li bytes", (unsigned long)*curr_len);
767 }
768
769 strcat(*dst, src);
770}
771static inline void xchrcat(char **dst, const char append, size_t *curr_len)
772{
773 static char my_app[2];
774 my_app[0] = append;
775 my_app[1] = '\0';
776 xstrcat(dst, my_app, curr_len);
777}
778static int xemptybuffer(const char *buff)
779{
780 long i;
781 for (i=0; buff[i]; ++i)
782 if (buff[i] != ' ')
783 return 0;
784 return 1;
785}
786
787
788
703int main(int argc, char *argv[]) 789int main(int argc, char *argv[])
704{ 790{
705 if (argc < 2) 791 if (argc < 2)
706 usage(EXIT_FAILURE); 792 usage(EXIT_FAILURE);
707 parseargs(argc, argv); 793 parseargs(argc, argv);

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