/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.36 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 1.36 2005/04/15 22:02:03 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 1.36 2005/04/15 22:02:03 vapier Exp $"; 38static const char *rcsid = "$Id: scanelf.c,v 1.43 2005/05/06 02:55:27 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;
59static char scan_symlink = 1;
54static char dir_recurse = 0; 60static char dir_recurse = 0;
55static char dir_crossmount = 1; 61static char dir_crossmount = 1;
56static char show_pax = 0; 62static char show_pax = 0;
57static char show_stack = 0; 63static char show_stack = 0;
58static char show_textrel = 0; 64static char show_textrel = 0;
59static char show_rpath = 0; 65static char show_rpath = 0;
60static char show_needed = 0; 66static char show_needed = 0;
67static char show_interp = 0;
61static char show_banner = 1; 68static char show_banner = 1;
62static char be_quiet = 0; 69static char be_quiet = 0;
63static char be_verbose = 0; 70static char be_verbose = 0;
71static char *find_sym = NULL, *versioned_symname = NULL;
64static char *find_sym = NULL; 72static char *out_format = NULL;
65 73
66 74
67 75
68/* scan an elf file and show all the fun stuff */ 76/* sub-funcs for scanelf_file() */
69static void scanelf_file(const char *filename) 77static char *scanelf_file_pax(elfobj *elf, char *found_pax)
70{ 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";
71 int i; 131 int i;
72 char found_pax, found_stack, found_relro, found_textrel,
73 found_rpath, found_needed, found_sym;
74 elfobj *elf;
75 struct stat st;
76 132
77 /* make sure path exists */ 133 if (!show_textrel) return NULL;
78 if (lstat(filename, &st) == -1)
79 return;
80 if (!S_ISREG(st.st_mode))
81 return;
82 found_pax = found_stack = found_relro = found_textrel = \
83 found_rpath = found_needed = found_sym = 0;
84 134
85 /* verify this is real ELF */
86 if ((elf = readelf(filename)) == NULL) {
87 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
88 return;
89 }
90
91 if (be_verbose > 1)
92 printf("%s: {%s,%s} scanning file\n", filename,
93 get_elfeitype(elf, EI_CLASS, elf->elf_class),
94 get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
95 else if (be_verbose)
96 printf("%s: scanning file\n", filename);
97
98 /* show the header */
99 if (!be_quiet && show_banner) {
100 printf(" TYPE ");
101 if (show_pax) printf(" PAX ");
102 if (show_stack) printf("STK/REL ");
103 if (show_textrel) printf("TEXTREL ");
104 if (show_rpath) printf("RPATH ");
105 if (show_needed) printf("NEEDED ");
106 printf(" FILE\n");
107 show_banner = 0;
108 }
109
110 /* dump all the good stuff */
111 if (!be_quiet)
112 printf("%-7s ", get_elfetype(elf));
113
114 if (show_pax) {
115 char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
116 if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
117 found_pax = 1;
118 printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
119 }
120 }
121
122 /* stack fun */
123 if (show_stack) {
124#define SHOW_STACK(B) \ 135#define SHOW_TEXTREL(B) \
125 if (elf->elf_class == ELFCLASS ## B) { \ 136 if (elf->elf_class == ELFCLASS ## B) { \
137 Elf ## B ## _Dyn *dyn; \
126 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 138 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
127 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 139 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
128 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 140 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
129 if (EGET(phdr[i].p_type) != PT_GNU_STACK && \ 141 if (phdr[i].p_type != PT_DYNAMIC) continue; \
130 EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \ 142 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
131 if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \ 143 while (EGET(dyn->d_tag) != DT_NULL) { \
132 continue; \ 144 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
133 if (EGET(phdr[i].p_type) == PT_GNU_STACK) \
134 found_stack = 1; \
135 if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \
136 found_relro = 1; \ 145 *found_textrel = 1; \
137 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; \
138 } \ 150 } \
139 }
140 SHOW_STACK(32)
141 SHOW_STACK(64)
142 if (!be_quiet && !found_stack) printf("--- ");
143 if (!be_quiet && !found_relro) printf("--- ");
144 }
145
146 /* textrel fun */
147 if (show_textrel) {
148#define SHOW_TEXTREL(B) \
149 if (elf->elf_class == ELFCLASS ## B) { \
150 Elf ## B ## _Dyn *dyn; \
151 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
152 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
153 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
154 if (phdr[i].p_type != PT_DYNAMIC) continue; \
155 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
156 while (EGET(dyn->d_tag) != DT_NULL) { \
157 if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
158 found_textrel = 1; \
159 /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
160 fputs("TEXTREL ", stdout); \
161 } \
162 ++dyn; \
163 } \
164 } } 151 } }
165 SHOW_TEXTREL(32) 152 SHOW_TEXTREL(32)
166 SHOW_TEXTREL(64) 153 SHOW_TEXTREL(64)
167 if (!be_quiet && !found_textrel) fputs("------- ", stdout); 154 if (be_quiet)
168 } 155 return NULL;
169 156 else
170 /* rpath fun */ 157 return " - ";
158}
159static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
160{
171 /* 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 */
172 if (show_rpath) { 162 int i;
173 char *rpath, *runpath; 163 char *rpath, *runpath;
164 void *strtbl_void;
165
166 if (!show_rpath) return;
167
174 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 168 strtbl_void = elf_findsecbyname(elf, ".dynstr");
175 rpath = runpath = NULL; 169 rpath = runpath = NULL;
176 170
177 if (strtbl_void) { 171 if (strtbl_void) {
178#define SHOW_RPATH(B) \ 172#define SHOW_RPATH(B) \
179 if (elf->elf_class == ELFCLASS ## B) { \ 173 if (elf->elf_class == ELFCLASS ## B) { \
180 Elf ## B ## _Dyn *dyn; \ 174 Elf ## B ## _Dyn *dyn; \
181 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 175 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
182 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 176 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
184 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 178 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
185 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 179 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
186 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 180 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
187 while (EGET(dyn->d_tag) != DT_NULL) { \ 181 while (EGET(dyn->d_tag) != DT_NULL) { \
188 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 !?"); \
189 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); \
190 found_rpath = 1; \ 185 *found_rpath = 1; \
191 } 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 !?"); \
192 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); \
193 found_rpath = 1; \ 189 *found_rpath = 1; \
194 } \ 190 } \
195 ++dyn; \ 191 ++dyn; \
196 } \ 192 } \
197 } } 193 } }
198 SHOW_RPATH(32) 194 SHOW_RPATH(32)
199 SHOW_RPATH(64) 195 SHOW_RPATH(64)
200 } 196 }
197
201 if (rpath && runpath) { 198 if (rpath && runpath) {
202 if (!strcmp(rpath, runpath)) 199 if (!strcmp(rpath, runpath)) {
203 printf("%-5s ", runpath); 200 xstrcat(ret, runpath, ret_len);
204 else { 201 } else {
205 fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath); 202 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
206 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);
207 } 208 }
208 } else if (rpath || runpath) 209 } else if (rpath || runpath)
209 printf("%-5s ", (runpath ? runpath : rpath)); 210 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
210 else if (!be_quiet && !found_rpath) 211 else if (!be_quiet)
211 printf(" - "); 212 xstrcat(ret, " - ", ret_len);
212 } 213}
213 214static void scanelf_file_needed(elfobj *elf, char *found_needed, char **ret, size_t *ret_len)
214 /* print out all the NEEDED entries */ 215{
215 if (show_needed) { 216 int i;
216 char *needed; 217 char *needed;
218 void *strtbl_void;
219
220 if (!show_needed) return;
221
217 void *strtbl_void = elf_findsecbyname(elf, ".dynstr"); 222 strtbl_void = elf_findsecbyname(elf, ".dynstr");
218 223
219 if (strtbl_void) { 224 if (strtbl_void) {
220#define SHOW_NEEDED(B) \ 225#define SHOW_NEEDED(B) \
221 if (elf->elf_class == ELFCLASS ## B) { \ 226 if (elf->elf_class == ELFCLASS ## B) { \
222 Elf ## B ## _Dyn *dyn; \ 227 Elf ## B ## _Dyn *dyn; \
223 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \ 228 Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
224 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \ 229 Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
225 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \ 230 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
226 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \ 231 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
227 if (be_verbose && EGET(phdr[i].p_type) == PT_INTERP) { \
228 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
229 printf("%s\n", elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr)); \
230 exit(0); \
231 } \
232 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \ 232 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
233 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \ 233 dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
234 while (EGET(dyn->d_tag) != DT_NULL) { \ 234 while (EGET(dyn->d_tag) != DT_NULL) { \
235 if (EGET(dyn->d_tag) == DT_NEEDED) { \ 235 if (EGET(dyn->d_tag) == DT_NEEDED) { \
236 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); \
237 if (found_needed) printf(","); \ 237 if (*found_needed) xchrcat(ret, ',', ret_len); \
238 printf("%s", needed); \ 238 xstrcat(ret, needed, ret_len); \
239 found_needed = 1; \ 239 *found_needed = 1; \
240 } \ 240 } \
241 ++dyn; \ 241 ++dyn; \
242 } \ 242 } \
243 } } 243 } }
244 SHOW_NEEDED(32) 244 SHOW_NEEDED(32)
245 SHOW_NEEDED(64) 245 SHOW_NEEDED(64)
246 } 246 }
247 if (!be_quiet && !found_needed) 247}
248 printf(" - "); 248static char *scanelf_file_interp(elfobj *elf, char *found_interp)
249 else if (found_needed) 249{
250 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); \
251 } 262 }
252 263 SHOW_INTERP(32)
253 /* search the symbol table for a specified symbol */ 264 SHOW_INTERP(64)
254 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;
255 void *symtab_void, *strtab_void; 271 void *symtab_void, *strtab_void;
256 char *versioned_symname;
257 size_t len;
258 272
259 len = strlen(find_sym) + 1; 273 if (!find_sym) return NULL;
260 versioned_symname = (char *)malloc(sizeof(char) * (len+1));
261 if (!versioned_symname) {
262 warnf("Could not malloc() mem for sym scan");
263 return;
264 }
265 sprintf(versioned_symname, "%s@", find_sym);
266 274
267 symtab_void = elf_findsecbyname(elf, ".symtab"); 275 symtab_void = elf_findsecbyname(elf, ".symtab");
268 strtab_void = elf_findsecbyname(elf, ".strtab"); 276 strtab_void = elf_findsecbyname(elf, ".strtab");
269 277
270 if (symtab_void && strtab_void) { 278 if (symtab_void && strtab_void) {
271#define FIND_SYM(B) \ 279#define FIND_SYM(B) \
272 if (elf->elf_class == ELFCLASS ## B) { \ 280 if (elf->elf_class == ELFCLASS ## B) { \
273 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \ 281 Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
274 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \ 282 Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
275 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)); \
278 for (i = 0; i < cnt; ++i) { \ 286 for (i = 0; i < cnt; ++i) { \
279 if (sym->st_name) { \ 287 if (sym->st_name) { \
280 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)); \
281 if (*find_sym == '*') { \ 289 if (*find_sym == '*') { \
282 printf("%s(%s) %5lX %15s %s\n", \ 290 printf("%s(%s) %5lX %15s %s\n", \
283 ((found_sym == 0) ? "\n\t" : "\t"), \ 291 ((*found_sym == 0) ? "\n\t" : "\t"), \
284 (char *)basename(filename), \ 292 (char *)basename(filename), \
285 (long)sym->st_size, \ 293 (long)sym->st_size, \
286 (char *)get_elfstttype(sym->st_info), \ 294 (char *)get_elfstttype(sym->st_info), \
287 symname); \ 295 symname); \
288 found_sym = 1; \ 296 *found_sym = 1; \
289 } else if ((strcmp(find_sym, symname) == 0) || \ 297 } else if ((strcmp(find_sym, symname) == 0) || \
290 (strncmp(symname, versioned_symname, len) == 0)) \ 298 (strcmp(symname, versioned_symname) == 0)) \
291 found_sym++; \ 299 (*found_sym)++; \
292 } \ 300 } \
293 ++sym; \ 301 ++sym; \
294 } } 302 } }
295 FIND_SYM(32) 303 FIND_SYM(32)
296 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;
297 } 377 }
298 free(versioned_symname);
299 if (*find_sym != '*') {
300 if (found_sym)
301 printf(" %s ", find_sym);
302 else if (!be_quiet)
303 fputs(" - ", stdout);
304 }
305 } 378 }
379 prints("\n");
380 show_banner = 0;
381 }
306 382
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) {
307 if (!be_quiet || found_pax || found_stack || found_textrel || \ 413 if (!be_quiet || found_pax || found_stack || found_textrel || \
308 found_rpath || found_needed || found_sym) 414 found_rpath || found_needed || found_interp || found_sym)
309 puts(filename); 415 xstrcat(&out_buffer, filename, &out_len);
416 }
417 if (!(be_quiet && xemptybuffer(out_buffer)))
418 puts(out_buffer);
310 419
311 unreadelf(elf); 420 unreadelf(elf);
312} 421}
313 422
314/* 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 */
319 struct stat st_top, st; 428 struct stat st_top, st;
320 char buf[_POSIX_PATH_MAX]; 429 char buf[_POSIX_PATH_MAX];
321 size_t pathlen = 0, len = 0; 430 size_t pathlen = 0, len = 0;
322 431
323 /* make sure path exists */ 432 /* make sure path exists */
324 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);
325 return; 435 return;
436 }
326 437
327 /* 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 */
328 if (!S_ISDIR(st_top.st_mode)) { 439 if (!S_ISDIR(st_top.st_mode)) {
329 scanelf_file(path); 440 scanelf_file(path);
330 return; 441 return;
369 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL) 480 if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
370 err("Unable to open ld.so.conf: %s", strerror(errno)); 481 err("Unable to open ld.so.conf: %s", strerror(errno));
371 482
372 scan_l = scan_ul = scan_ull = 0; 483 scan_l = scan_ul = scan_ull = 0;
373 484
374 if ((path = malloc(_POSIX_PATH_MAX)) == NULL) { 485 path = (char*)xmalloc(_POSIX_PATH_MAX);
375 warn("Can not malloc() memory for ldpath scanning");
376 return;
377 }
378 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL) 486 while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
379 if (*path == '/') { 487 if (*path == '/') {
380 if ((p = strrchr(path, '\r')) != NULL) 488 if ((p = strrchr(path, '\r')) != NULL)
381 *p = 0; 489 *p = 0;
382 if ((p = strrchr(path, '\n')) != NULL) 490 if ((p = strrchr(path, '\n')) != NULL)
400 char *path, *p; 508 char *path, *p;
401 509
402 path = getenv("PATH"); 510 path = getenv("PATH");
403 if (!path) 511 if (!path)
404 err("PATH is not set in your env !"); 512 err("PATH is not set in your env !");
405 513 path = xstrdup(path);
406 if ((path = strdup(path)) == NULL)
407 err("strdup failed: %s", strerror(errno));
408 514
409 while ((p = strrchr(path, ':')) != NULL) { 515 while ((p = strrchr(path, ':')) != NULL) {
410 scanelf_dir(p + 1); 516 scanelf_dir(p + 1);
411 *p = 0; 517 *p = 0;
412 } 518 }
415} 521}
416 522
417 523
418 524
419/* usage / invocation handling functions */ 525/* usage / invocation handling functions */
420#define PARSE_FLAGS "plRmxetrns:aqvo:BhV" 526#define PARSE_FLAGS "plRmyxetrnis:aqvF:o:BhV"
421#define a_argument required_argument 527#define a_argument required_argument
422static struct option const long_opts[] = { 528static struct option const long_opts[] = {
423 {"path", no_argument, NULL, 'p'}, 529 {"path", no_argument, NULL, 'p'},
424 {"ldpath", no_argument, NULL, 'l'}, 530 {"ldpath", no_argument, NULL, 'l'},
425 {"recursive", no_argument, NULL, 'R'}, 531 {"recursive", no_argument, NULL, 'R'},
426 {"mount", no_argument, NULL, 'm'}, 532 {"mount", no_argument, NULL, 'm'},
533 {"symlink", no_argument, NULL, 'y'},
427 {"pax", no_argument, NULL, 'x'}, 534 {"pax", no_argument, NULL, 'x'},
428 {"header", no_argument, NULL, 'e'}, 535 {"header", no_argument, NULL, 'e'},
429 {"textrel", no_argument, NULL, 't'}, 536 {"textrel", no_argument, NULL, 't'},
430 {"rpath", no_argument, NULL, 'r'}, 537 {"rpath", no_argument, NULL, 'r'},
431 {"needed", no_argument, NULL, 'n'}, 538 {"needed", no_argument, NULL, 'n'},
539 {"interp", no_argument, NULL, 'i'},
432 {"symbol", a_argument, NULL, 's'}, 540 {"symbol", a_argument, NULL, 's'},
433 {"all", no_argument, NULL, 'a'}, 541 {"all", no_argument, NULL, 'a'},
434 {"quiet", no_argument, NULL, 'q'}, 542 {"quiet", no_argument, NULL, 'q'},
435 {"verbose", no_argument, NULL, 'v'}, 543 {"verbose", no_argument, NULL, 'v'},
544 {"format", a_argument, NULL, 'F'},
436 {"file", a_argument, NULL, 'o'}, 545 {"file", a_argument, NULL, 'o'},
437 {"nobanner", no_argument, NULL, 'B'}, 546 {"nobanner", no_argument, NULL, 'B'},
438 {"help", no_argument, NULL, 'h'}, 547 {"help", no_argument, NULL, 'h'},
439 {"version", no_argument, NULL, 'V'}, 548 {"version", no_argument, NULL, 'V'},
440 {NULL, no_argument, NULL, 0x0} 549 {NULL, no_argument, NULL, 0x0}
441}; 550};
442static char *opts_help[] = { 551static char *opts_help[] = {
443 "Scan all directories in PATH environment", 552 "Scan all directories in PATH environment",
444 "Scan all directories in /etc/ld.so.conf", 553 "Scan all directories in /etc/ld.so.conf",
445 "Scan directories recursively", 554 "Scan directories recursively",
446 "Don't recursively cross mount points\n", 555 "Don't recursively cross mount points",
556 "Don't scan symlinks\n",
447 "Print PaX markings", 557 "Print PaX markings",
448 "Print GNU_STACK markings", 558 "Print GNU_STACK markings",
449 "Print TEXTREL information", 559 "Print TEXTREL information",
450 "Print RPATH information", 560 "Print RPATH information",
451 "Print NEEDED information", 561 "Print NEEDED information",
562 "Print INTERP information",
452 "Find a specified symbol", 563 "Find a specified symbol",
453 "Print all scanned info (-x -e -t -r)\n", 564 "Print all scanned info (-x -e -t -r)\n",
454 "Only output 'bad' things", 565 "Only output 'bad' things",
455 "Be verbose (can be specified more than once)", 566 "Be verbose (can be specified more than once)",
567 "Use specified format for output",
456 "Write output stream to a filename", 568 "Write output stream to a filename",
457 "Don't display the header", 569 "Don't display the header",
458 "Print this help and exit", 570 "Print this help and exit",
459 "Print version and exit", 571 "Print version and exit",
460 NULL 572 NULL
462 574
463/* display usage and exit */ 575/* display usage and exit */
464static void usage(int status) 576static void usage(int status)
465{ 577{
466 int i; 578 int i;
467 printf(" Scan ELF binaries for stuff\n" 579 printf(" Scan ELF binaries for stuff\n\n"
468 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0); 580 "Usage: %s [options] <dir1/file1> [dir2 dirN fileN ...]\n\n", argv0);
469 printf("Options: -[%s]\n", PARSE_FLAGS); 581 printf("Options: -[%s]\n", PARSE_FLAGS);
470 for (i = 0; long_opts[i].name; ++i) 582 for (i = 0; long_opts[i].name; ++i)
471 if (long_opts[i].has_arg == no_argument) 583 if (long_opts[i].has_arg == no_argument)
472 printf(" -%c, --%-13s %s\n", long_opts[i].val, 584 printf(" -%c, --%-13s %s\n", long_opts[i].val,
484 596
485 opterr = 0; 597 opterr = 0;
486 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) {
487 switch (flag) { 599 switch (flag) {
488 600
489 case 'V': /* version info */ 601 case 'V':
490 printf("%s compiled %s\n%s\n" 602 printf("%s compiled %s\n%s\n"
491 "%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",
492 __FILE__, __DATE__, rcsid, argv0); 604 __FILE__, __DATE__, rcsid, argv0);
493 exit(EXIT_SUCCESS); 605 exit(EXIT_SUCCESS);
494 break; 606 break;
501 err("Could not open output stream '%s': %s", optarg, strerror(errno)); 613 err("Could not open output stream '%s': %s", optarg, strerror(errno));
502 stdout = fp; 614 stdout = fp;
503 break; 615 break;
504 } 616 }
505 617
506 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 }
507 626
627 case 'F': {
628 out_format = strdup(optarg);
629 break;
630 }
631
632 case 'y': scan_symlink = 0; break;
508 case 'B': show_banner = 0; break; 633 case 'B': show_banner = 0; break;
509 case 'l': scan_ldpath = 1; break; 634 case 'l': scan_ldpath = 1; break;
510 case 'p': scan_envpath = 1; break; 635 case 'p': scan_envpath = 1; break;
511 case 'R': dir_recurse = 1; break; 636 case 'R': dir_recurse = 1; break;
512 case 'm': dir_crossmount = 0; break; 637 case 'm': dir_crossmount = 0; break;
513 case 'x': show_pax = 1; break; 638 case 'x': show_pax = 1; break;
514 case 'e': show_stack = 1; break; 639 case 'e': show_stack = 1; break;
515 case 't': show_textrel = 1; break; 640 case 't': show_textrel = 1; break;
516 case 'r': show_rpath = 1; break; 641 case 'r': show_rpath = 1; break;
517 case 'n': show_needed = 1; break; 642 case 'n': show_needed = 1; break;
643 case 'i': show_interp = 1; break;
518 case 'q': be_quiet = 1; break; 644 case 'q': be_quiet = 1; break;
519 case 'v': be_verbose = (be_verbose % 20) + 1; break; 645 case 'v': be_verbose = (be_verbose % 20) + 1; break;
520 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;
521 647
522 case ':': 648 case ':':
523 warn("Option missing parameter"); 649 warn("Option missing parameter\n");
524 usage(EXIT_FAILURE); 650 usage(EXIT_FAILURE);
525 break; 651 break;
526 case '?': 652 case '?':
527 warn("Unknown option"); 653 warn("Unknown option\n");
528 usage(EXIT_FAILURE); 654 usage(EXIT_FAILURE);
529 break; 655 break;
530 default: 656 default:
531 err("Unhandled option '%c'", flag); 657 err("Unhandled option '%c'", flag);
532 break; 658 break;
534 } 660 }
535 661
536 if (be_quiet && be_verbose) 662 if (be_quiet && be_verbose)
537 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");
538 664
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 */
539 if (scan_ldpath) scanelf_ldpath(); 705 if (scan_ldpath) scanelf_ldpath();
540 if (scan_envpath) scanelf_envpath(); 706 if (scan_envpath) scanelf_envpath();
541 if (optind == argc && !scan_ldpath && !scan_envpath) 707 if (optind == argc && !scan_ldpath && !scan_envpath)
542 err("Nothing to scan !?"); 708 err("Nothing to scan !?");
543 while (optind < argc) 709 while (optind < argc)
544 scanelf_dir(argv[optind++]); 710 scanelf_dir(argv[optind++]);
545 711
546 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;
547} 763}
548 764
549 765
550 766
551int main(int argc, char *argv[]) 767int main(int argc, char *argv[])

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