/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.32 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 1.32 2005/04/07 00:01:40 vapier 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 1.32 2005/04/07 00:01:40 vapier 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;
71static char show_needed = 0; 66static char show_needed = 0;
67static char show_interp = 0;
72static char show_banner = 1; 68static char show_banner = 1;
73static char be_quiet = 0; 69static char be_quiet = 0;
74static char be_verbose = 0; 70static char be_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL;
75static char *find_sym = NULL; 72static char *out_format = NULL;
76 73
77 74
78 75
79/* scan an elf file and show all the fun stuff */ 76/* sub-funcs for scanelf_file() */
80static void scanelf_file(const char *filename) 77static char *scanelf_file_pax(elfobj *elf, char *found_pax)
81{ 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";
82 int i; 131 int i;
83 char found_pax, found_stack, found_relro, found_textrel,
84 found_rpath, found_needed, found_sym;
85 elfobj *elf;
86 132
87 found_pax = found_stack = found_relro = found_textrel = \ 133 if (!show_textrel) return NULL;
88 found_rpath = found_needed = found_sym = 0;
89 134
90 /* verify this is real ELF */
91 if ((elf = readelf(filename)) == NULL) {
92 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
93 return;
94 }
95
96 if (be_verbose > 1)
97 printf("%s: {%s,%s} scanning file\n", filename,
98 get_elfeitype(elf, EI_CLASS, elf->elf_class),
99 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
100 else if (be_verbose)
101 printf("%s: scanning file\n", filename);
102
103 /* show the header */
104 if (!be_quiet && show_banner) {
105 printf(" TYPE ");
106 if (show_pax) printf(" PAX ");
107 if (show_stack) printf("STK/REL ");
108 if (show_textrel) printf("TEXTREL ");
109 if (show_rpath) printf("RPATH ");
110 if (show_needed) printf("NEEDED ");
111 printf(" FILE\n");
112 show_banner = 0;
113 }
114
115 /* dump all the good stuff */
116 if (!be_quiet)
117 printf("%-7s ", get_elfetype(elf));
118
119 if (show_pax) {
120 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
121 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
122 found_pax = 1;
123 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
124 }
125 }
126
127 /* stack fun */
128 if (show_stack) {
129#define SHOW_STACK(B) \ 135#define SHOW_TEXTREL(B) \
130 if (elf->elf_class == ELFCLASS ## B) { \ 136 if (elf->elf_class == ELFCLASS ## B) { \
137 Elf ## B ## _Dyn *dyn; \
131 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 138 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
132 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 139 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
133 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 140 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
134 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 141 if (phdr[i].p_type != PT_DYNAMIC) continue; \
135 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \ 142 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
136 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 143 while (EGET(dyn->d_tag) != DT_NULL) { \
137 continue; \ 144 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
138 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \
139 found_stack = 1; \
140 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \
141 found_relro = 1; \ 145 *found_textrel = 1; \
142 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; \
143 } \ 150 } \
144 }
145 SHOW_STACK(32)
146 SHOW_STACK(64)
147 if (!be_quiet && !found_stack) printf("--- ");
148 if (!be_quiet && !found_relro) printf("--- ");
149 }
150
151 /* textrel fun */
152 if (show_textrel) {
153#define SHOW_TEXTREL(B) \
154 if (elf->elf_class == ELFCLASS ## B) { \
155 Elf ## B ## _Dyn *dyn; \
156 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
157 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
158 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
159 if (phdr[i].p_type != PT_DYNAMIC) continue; \
160 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
161 while (EGET(dyn->d_tag) != DT_NULL) { \
162 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
163 found_textrel = 1; \
164 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
165 printf("TEXTREL "); \
166 } \
167 ++dyn; \
168 } \
169 } } 151 } }
170 SHOW_TEXTREL(32) 152 SHOW_TEXTREL(32)
171 SHOW_TEXTREL(64) 153 SHOW_TEXTREL(64)
172 if (!be_quiet && !found_textrel) printf("------- "); 154 if (be_quiet)
173 } 155 return NULL;
174 156 else
175 /* rpath fun */ 157 return " - ";
158}
159static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
160{
176 /* 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 */
177 if (show_rpath) { 162 int i;
178 char *rpath, *runpath; 163 char *rpath, *runpath;
164 void *strtbl_void;
165
166 if (!show_rpath) return;
167
179 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 168 strtbl_void = elf_findsecbyname(elf, ".dynstr");
180 rpath = runpath = NULL; 169 rpath = runpath = NULL;
181 170
182 if (strtbl_void) { 171 if (strtbl_void) {
183#define SHOW_RPATH(B) \ 172#define SHOW_RPATH(B) \
184 if (elf->elf_class == ELFCLASS ## B) { \ 173 if (elf->elf_class == ELFCLASS ## B) { \
185 Elf ## B ## _Dyn *dyn; \ 174 Elf ## B ## _Dyn *dyn; \
186 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 175 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
187 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 176 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
189 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 178 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
190 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 179 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
191 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 180 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
192 while (EGET(dyn->d_tag) != DT_NULL) { \ 181 while (EGET(dyn->d_tag) != DT_NULL) { \
193 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 !?"); \
194 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); \
195 found_rpath = 1; \ 185 *found_rpath = 1; \
196 } 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 !?"); \
197 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); \
198 found_rpath = 1; \ 189 *found_rpath = 1; \
199 } \ 190 } \
200 ++dyn; \ 191 ++dyn; \
201 } \ 192 } \
202 } } 193 } }
203 SHOW_RPATH(32) 194 SHOW_RPATH(32)
204 SHOW_RPATH(64) 195 SHOW_RPATH(64)
205 } 196 }
197
206 if (rpath && runpath) { 198 if (rpath && runpath) {
207 if (!strcmp(rpath, runpath)) 199 if (!strcmp(rpath, runpath)) {
208 printf("%-5s ", runpath); 200 xstrcat(ret, runpath, ret_len);
209 else { 201 } else {
210 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 202 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
211 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);
212 } 208 }
213 } else if (rpath || runpath) 209 } else if (rpath || runpath)
214 printf("%-5s ", (runpath ? runpath : rpath)); 210 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
215 else if (!be_quiet && !found_rpath) 211 else if (!be_quiet)
216 printf(" - "); 212 xstrcat(ret, " - ", ret_len);
217 } 213}
218 214static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
219 /* print out all the NEEDED entries */ 215{
220 if (show_needed) { 216 int i;
221 char *needed; 217 char *needed;
218 void *strtbl_void;
219
220 if (!show_needed) return;
221
222 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 222 strtbl_void = elf_findsecbyname(elf, ".dynstr");
223 223
224 if (strtbl_void) { 224 if (strtbl_void) {
225#define SHOW_NEEDED(B) \ 225#define SHOW_NEEDED(B) \
226 if (elf->elf_class == ELFCLASS ## B) { \ 226 if (elf->elf_class == ELFCLASS ## B) { \
227 Elf ## B ## _Dyn *dyn; \ 227 Elf ## B ## _Dyn *dyn; \
228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
229 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 229 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
231 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 231 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
232 if (be_verbose && EGET(phdr[i].p_type) == PT_INTERP) { \
233 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
234 printf("%s\n", elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr)); \
235 exit(0); \
236 } \
237 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 232 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
238 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 233 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
239 while (EGET(dyn->d_tag) != DT_NULL) { \ 234 while (EGET(dyn->d_tag) != DT_NULL) { \
240 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 235 if (EGET(dyn->d_tag) == DT_NEEDED) { \
241 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \ 236 needed = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
242 if (found_needed) printf(","); \ 237 if (*found_needed) xchrcat(ret, ',', ret_len); \
243 printf("%s", needed); \ 238 xstrcat(ret, needed, ret_len); \
244 found_needed = 1; \ 239 *found_needed = 1; \
245 } \ 240 } \
246 ++dyn; \ 241 ++dyn; \
247 } \ 242 } \
248 } } 243 } }
249 SHOW_NEEDED(32) 244 SHOW_NEEDED(32)
250 SHOW_NEEDED(64) 245 SHOW_NEEDED(64)
251 } 246 }
252 if (!be_quiet && !found_needed) 247}
253 printf(" - "); 248static char *scanelf_file_interp(elfobj *elf, char *found_interp)
254 else if (found_needed) 249{
255 printf(" "); 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); \
256 } 262 }
257 263 SHOW_INTERP(32)
258 /* search the symbol table for a specified symbol */ 264 SHOW_INTERP(64)
259 if (find_sym) { 265 }
266 return NULL;
267}
268static char *scanelf_file_sym(elfobj *elf, char *found_sym, const char *filename)
269{
270 int i;
260 void *symtab_void, *strtab_void; 271 void *symtab_void, *strtab_void;
261 char *versioned_symname;
262 size_t len;
263 272
264 len = strlen(find_sym) + 1; 273 if (!find_sym) return NULL;
265 versioned_symname = (char *)malloc(sizeof(char) * (len+1));
266 if (!versioned_symname) {
267 warnf("Could not malloc() mem for sym scan");
268 return;
269 }
270 sprintf(versioned_symname, "%s@", find_sym);
271 274
272 symtab_void = elf_findsecbyname(elf, ".symtab"); 275 symtab_void = elf_findsecbyname(elf, ".symtab");
273 strtab_void = elf_findsecbyname(elf, ".strtab"); 276 strtab_void = elf_findsecbyname(elf, ".strtab");
274 277
275 if (symtab_void && strtab_void) { 278 if (symtab_void && strtab_void) {
276#define FIND_SYM(B) \ 279#define FIND_SYM(B) \
277 if (elf->elf_class == ELFCLASS ## B) { \ 280 if (elf->elf_class == ELFCLASS ## B) { \
278 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 281 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
279 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 282 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
280 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)); \
283 for (i = 0; i < cnt; ++i) { \ 286 for (i = 0; i < cnt; ++i) { \
284 if (sym->st_name) { \ 287 if (sym->st_name) { \
285 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)); \
286 if (*find_sym == '*') { \ 289 if (*find_sym == '*') { \
287 printf("%s(%s) %5lX %15s %s\n", \ 290 printf("%s(%s) %5lX %15s %s\n", \
288 ((found_sym == 0) ? "\n\t" : "\t"), \ 291 ((*found_sym == 0) ? "\n\t" : "\t"), \
289 (char *)basename(filename), \ 292 (char *)basename(filename), \
290 (long)sym->st_size, \ 293 (long)sym->st_size, \
291 (char *)get_elfstttype(sym->st_info), \ 294 (char *)get_elfstttype(sym->st_info), \
292 symname); \ 295 symname); \
293 found_sym = 1; \ 296 *found_sym = 1; \
294 } else if ((strcmp(find_sym, symname) == 0) || \ 297 } else if ((strcmp(find_sym, symname) == 0) || \
295 (strncmp(symname, versioned_symname, len) == 0)) \ 298 (strcmp(symname, versioned_symname) == 0)) \
296 found_sym++; \ 299 (*found_sym)++; \
297 } \ 300 } \
298 ++sym; \ 301 ++sym; \
299 } } 302 } }
300 FIND_SYM(32) 303 FIND_SYM(32)
301 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;
302 } 377 }
303 free(versioned_symname);
304 if (*find_sym != '*') {
305 if (found_sym)
306 printf(" %s ", find_sym);
307 else if (!be_quiet)
308 printf(" - ");
309 }
310 } 378 }
379 prints("\n");
380 show_banner = 0;
381 }
311 382
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) {
312 if (!be_quiet || found_pax || found_stack || found_textrel || \ 413 if (!be_quiet || found_pax || found_stack || found_textrel || \
313 found_rpath || found_needed || found_sym) 414 found_rpath || found_needed || found_interp || found_sym)
314 printf("%s\n", filename); 415 xstrcat(&out_buffer, filename, &out_len);
416 }
417 if (!(be_quiet && xemptybuffer(out_buffer)))
418 puts(out_buffer);
315 419
316 unreadelf(elf); 420 unreadelf(elf);
317} 421}
318 422
319/* 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 */
324 struct stat st_top, st; 428 struct stat st_top, st;
325 char buf[_POSIX_PATH_MAX]; 429 char buf[_POSIX_PATH_MAX];
326 size_t pathlen = 0, len = 0; 430 size_t pathlen = 0, len = 0;
327 431
328 /* make sure path exists */ 432 /* make sure path exists */
329 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);
330 return; 435 return;
436 }
331 437
332 /* 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 */
333 if (!S_ISDIR(st_top.st_mode)) { 439 if (!S_ISDIR(st_top.st_mode)) {
334 scanelf_file(path); 440 scanelf_file(path);
335 return; 441 return;
374 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 480 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
375 err("Unable to open ld.so.conf: %s", strerror(errno)); 481 err("Unable to open ld.so.conf: %s", strerror(errno));
376 482
377 scan_l = scan_ul = scan_ull = 0; 483 scan_l = scan_ul = scan_ull = 0;
378 484
379 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) { 485 path = (char*)xmalloc(_POSIX_PATH_MAX);
380 warn("Can not malloc() memory for ldpath scanning");
381 return;
382 }
383 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 486 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
384 if (*path == '/') { 487 if (*path == '/') {
385 if ((p = strrchr(path, '\r')) != NULL) 488 if ((p = strrchr(path, '\r')) != NULL)
386 *p = 0; 489 *p = 0;
387 if ((p = strrchr(path, '\n')) != NULL) 490 if ((p = strrchr(path, '\n')) != NULL)
405 char *path, *p; 508 char *path, *p;
406 509
407 path = getenv("PATH"); 510 path = getenv("PATH");
408 if (!path) 511 if (!path)
409 err("PATH is not set in your env !"); 512 err("PATH is not set in your env !");
410 513 path = xstrdup(path);
411 if ((path = strdup(path)) == NULL)
412 err("strdup failed: %s", strerror(errno));
413 514
414 while ((p = strrchr(path, ':')) != NULL) { 515 while ((p = strrchr(path, ':')) != NULL) {
415 scanelf_dir(p + 1); 516 scanelf_dir(p + 1);
416 *p = 0; 517 *p = 0;
417 } 518 }
420} 521}
421 522
422 523
423 524
424/* usage / invocation handling functions */ 525/* usage / invocation handling functions */
425#define PARSE_FLAGS "plRmxetrns:aqvo:BhV" 526#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV"
426#define a_argument required_argument 527#define a_argument required_argument
427static struct option const long_opts[] = { 528static struct option const long_opts[] = {
428 {"path", no_argument, NULL, 'p'}, 529 {"path", no_argument, NULL, 'p'},
429 {"ldpath", no_argument, NULL, 'l'}, 530 {"ldpath", no_argument, NULL, 'l'},
430 {"recursive", no_argument, NULL, 'R'}, 531 {"recursive", no_argument, NULL, 'R'},
431 {"mount", no_argument, NULL, 'm'}, 532 {"mount", no_argument, NULL, 'm'},
533 {"symlink", no_argument, NULL, 'y'},
432 {"pax", no_argument, NULL, 'x'}, 534 {"pax", no_argument, NULL, 'x'},
433 {"header", no_argument, NULL, 'e'}, 535 {"header", no_argument, NULL, 'e'},
434 {"textrel", no_argument, NULL, 't'}, 536 {"textrel", no_argument, NULL, 't'},
435 {"rpath", no_argument, NULL, 'r'}, 537 {"rpath", no_argument, NULL, 'r'},
436 {"needed", no_argument, NULL, 'n'}, 538 {"needed", no_argument, NULL, 'n'},
539 {"interp", no_argument, NULL, 'i'},
437 {"symbol", a_argument, NULL, 's'}, 540 {"symbol", a_argument, NULL, 's'},
438 {"all", no_argument, NULL, 'a'}, 541 {"all", no_argument, NULL, 'a'},
439 {"quiet", no_argument, NULL, 'q'}, 542 {"quiet", no_argument, NULL, 'q'},
440 {"verbose", no_argument, NULL, 'v'}, 543 {"verbose", no_argument, NULL, 'v'},
544 {"format", a_argument, NULL, 'F'},
441 {"file", a_argument, NULL, 'o'}, 545 {"file", a_argument, NULL, 'o'},
442 {"nobanner", no_argument, NULL, 'B'}, 546 {"nobanner", no_argument, NULL, 'B'},
443 {"help", no_argument, NULL, 'h'}, 547 {"help", no_argument, NULL, 'h'},
444 {"version", no_argument, NULL, 'V'}, 548 {"version", no_argument, NULL, 'V'},
445 {NULL, no_argument, NULL, 0x0} 549 {NULL, no_argument, NULL, 0x0}
446}; 550};
447static char *opts_help[] = { 551static char *opts_help[] = {
448 "Scan all directories in PATH environment", 552 "Scan all directories in PATH environment",
449 "Scan all directories in /etc/ld.so.conf", 553 "Scan all directories in /etc/ld.so.conf",
450 "Scan directories recursively", 554 "Scan directories recursively",
451 "Don't recursively cross mount points\n", 555 "Don't recursively cross mount points",
556 "Don't scan symlinks\n",
452 "Print PaX markings", 557 "Print PaX markings",
453 "Print GNU_STACK markings", 558 "Print GNU_STACK markings",
454 "Print TEXTREL information", 559 "Print TEXTREL information",
455 "Print RPATH information", 560 "Print RPATH information",
456 "Print NEEDED information", 561 "Print NEEDED information",
562 "Print INTERP information",
457 "Find a specified symbol", 563 "Find a specified symbol",
458 "Print all scanned info (-x -e -t -r)\n", 564 "Print all scanned info (-x -e -t -r)\n",
459 "Only output 'bad' things", 565 "Only output 'bad' things",
460 "Be verbose (can be specified more than once)", 566 "Be verbose (can be specified more than once)",
567 "Use specified format for output",
461 "Write output stream to a filename", 568 "Write output stream to a filename",
462 "Don't display the header", 569 "Don't display the header",
463 "Print this help and exit", 570 "Print this help and exit",
464 "Print version and exit", 571 "Print version and exit",
465 NULL 572 NULL
467 574
468/* display usage and exit */ 575/* display usage and exit */
469static void usage(int status) 576static void usage(int status)
470{ 577{
471 int i; 578 int i;
472 printf(" Scan ELF binaries for stuff\n" 579 printf(" Scan ELF binaries for stuff\n\n"
473 "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0); 580 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
474 printf("Options:\n"); 581 printf("Options: -[%s]\n", PARSE_FLAGS);
475 for (i = 0; long_opts[i].name; ++i) 582 for (i = 0; long_opts[i].name; ++i)
476 if (long_opts[i].has_arg == no_argument) 583 if (long_opts[i].has_arg == no_argument)
477 printf(" -%c, --%-13s %s\n", long_opts[i].val, 584 printf(" -%c, --%-13s %s\n", long_opts[i].val,
478 long_opts[i].name, opts_help[i]); 585 long_opts[i].name, opts_help[i]);
479 else 586 else
489 596
490 opterr = 0; 597 opterr = 0;
491 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) {
492 switch (flag) { 599 switch (flag) {
493 600
494 case 'V': /* version info */ 601 case 'V':
495 printf("%s compiled %s\n%s\n" 602 printf("%s compiled %s\n%s\n"
496 "%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",
497 __FILE__, __DATE__, rcsid, argv0); 604 __FILE__, __DATE__, rcsid, argv0);
498 exit(EXIT_SUCCESS); 605 exit(EXIT_SUCCESS);
499 break; 606 break;
506 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 613 err("Could not open output stream '%s': %s", optarg, strerror(errno));
507 stdout = fp; 614 stdout = fp;
508 break; 615 break;
509 } 616 }
510 617
511 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 }
512 626
627 case 'F': {
628 out_format = strdup(optarg);
629 break;
630 }
631
632 case 'y': scan_symlink = 0; break;
513 case 'B': show_banner = 0; break; 633 case 'B': show_banner = 0; break;
514 case 'l': scan_ldpath = 1; break; 634 case 'l': scan_ldpath = 1; break;
515 case 'p': scan_envpath = 1; break; 635 case 'p': scan_envpath = 1; break;
516 case 'R': dir_recurse = 1; break; 636 case 'R': dir_recurse = 1; break;
517 case 'm': dir_crossmount = 0; break; 637 case 'm': dir_crossmount = 0; break;
518 case 'x': show_pax = 1; break; 638 case 'x': show_pax = 1; break;
519 case 'e': show_stack = 1; break; 639 case 'e': show_stack = 1; break;
520 case 't': show_textrel = 1; break; 640 case 't': show_textrel = 1; break;
521 case 'r': show_rpath = 1; break; 641 case 'r': show_rpath = 1; break;
522 case 'n': show_needed = 1; break; 642 case 'n': show_needed = 1; break;
643 case 'i': show_interp = 1; break;
523 case 'q': be_quiet = 1; break; 644 case 'q': be_quiet = 1; break;
524 case 'v': be_verbose = (be_verbose % 20) + 1; break; 645 case 'v': be_verbose = (be_verbose % 20) + 1; break;
525 case 'a': show_pax = show_stack = show_textrel = show_needed = show_rpath = 1; break; 646 case 'a': show_pax = show_stack = show_textrel = show_rpath = show_needed = show_interp = 1; break;
526 647
527 case ':': 648 case ':':
528 warn("Option missing parameter"); 649 warn("Option missing parameter\n");
529 usage(EXIT_FAILURE); 650 usage(EXIT_FAILURE);
530 break; 651 break;
531 case '?': 652 case '?':
532 warn("Unknown option"); 653 warn("Unknown option\n");
533 usage(EXIT_FAILURE); 654 usage(EXIT_FAILURE);
534 break; 655 break;
535 default: 656 default:
536 err("Unhandled option '%c'", flag); 657 err("Unhandled option '%c'", flag);
537 break; 658 break;
539 } 660 }
540 661
541 if (be_quiet && be_verbose) 662 if (be_quiet && be_verbose)
542 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");
543 664
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 */
544 if (scan_ldpath) scanelf_ldpath(); 705 if (scan_ldpath) scanelf_ldpath();
545 if (scan_envpath) scanelf_envpath(); 706 if (scan_envpath) scanelf_envpath();
546 if (optind == argc && !scan_ldpath && !scan_envpath) 707 if (optind == argc && !scan_ldpath && !scan_envpath)
547 err("Nothing to scan !?"); 708 err("Nothing to scan !?");
548 while (optind < argc) 709 while (optind < argc)
549 scanelf_dir(argv[optind++]); 710 scanelf_dir(argv[optind++]);
550 711
551 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;
552} 763}
553 764
554 765
555 766
556int main(int argc, char *argv[]) 767int main(int argc, char *argv[])

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