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Revision 1.110 - (hide annotations) (download) (as text)
Fri Jan 20 00:21:03 2006 UTC (8 years, 5 months ago) by vapier
Branch: MAIN
Changes since 1.109: +1 -1 lines
File MIME type: text/x-csrc
cast pointers as void* to get rid of warnings

1 solar 1.1 /*
2 vapier 1.98 * Copyright 2003-2006 Gentoo Foundation
3 solar 1.1 * Distributed under the terms of the GNU General Public License v2
4 vapier 1.109 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.108 2006/01/19 23:53:34 vapier Exp $
5 solar 1.1 *
6 vapier 1.98 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7     * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 solar 1.1 */
9    
10 vapier 1.89 #include "paxinc.h"
11 solar 1.1
12 vapier 1.109 static const char *rcsid = "$Id: scanelf.c,v 1.108 2006/01/19 23:53:34 vapier Exp $";
13 vapier 1.36 #define argv0 "scanelf"
14 vapier 1.10
15 vapier 1.70 #define IS_MODIFIER(c) (c == '%' || c == '#')
16    
17 vapier 1.10
18    
19     /* prototypes */
20 vapier 1.106 static int scanelf_elfobj(elfobj *elf);
21     static int scanelf_elf(const char *filename, int fd, size_t len);
22     static int scanelf_archive(const char *filename, int fd, size_t len);
23 vapier 1.10 static void scanelf_file(const char *filename);
24     static void scanelf_dir(const char *path);
25 vapier 1.106 static void scanelf_ldpath(void);
26     static void scanelf_envpath(void);
27 vapier 1.10 static void usage(int status);
28     static void parseargs(int argc, char *argv[]);
29 vapier 1.60 static char *xstrdup(const char *s);
30 vapier 1.41 static void *xmalloc(size_t size);
31 vapier 1.95 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
32     #define xstrcat(dst,src,curr_len) xstrncat(dst,src,curr_len,0)
33 vapier 1.41 static inline void xchrcat(char **dst, const char append, size_t *curr_len);
34 vapier 1.10
35     /* variables to control behavior */
36 vapier 1.48 static char *ldpaths[256];
37 vapier 1.10 static char scan_ldpath = 0;
38     static char scan_envpath = 0;
39 vapier 1.37 static char scan_symlink = 1;
40 vapier 1.105 static char scan_archives = 0;
41 vapier 1.10 static char dir_recurse = 0;
42 vapier 1.14 static char dir_crossmount = 1;
43 vapier 1.10 static char show_pax = 0;
44 solar 1.73 static char show_phdr = 0;
45 vapier 1.10 static char show_textrel = 0;
46     static char show_rpath = 0;
47 vapier 1.32 static char show_needed = 0;
48 vapier 1.38 static char show_interp = 0;
49 vapier 1.49 static char show_bind = 0;
50 vapier 1.84 static char show_soname = 0;
51 vapier 1.76 static char show_textrels = 0;
52 solar 1.16 static char show_banner = 1;
53 vapier 1.10 static char be_quiet = 0;
54 vapier 1.14 static char be_verbose = 0;
55 vapier 1.70 static char be_wewy_wewy_quiet = 0;
56 vapier 1.39 static char *find_sym = NULL, *versioned_symname = NULL;
57 vapier 1.72 static char *find_lib = NULL;
58 vapier 1.39 static char *out_format = NULL;
59 vapier 1.66 static char *search_path = NULL;
60 vapier 1.101 static char fix_elf = 0;
61 solar 1.86 static char gmatch = 0;
62 vapier 1.102 static char use_ldcache = 0;
63 solar 1.1
64 vapier 1.70
65 solar 1.96 caddr_t ldcache = 0;
66     size_t ldcache_size = 0;
67    
68 vapier 1.39 /* sub-funcs for scanelf_file() */
69 vapier 1.77 static void scanelf_file_get_symtabs(elfobj *elf, void **sym, void **tab)
70     {
71     /* find the best SHT_DYNSYM and SHT_STRTAB sections */
72     #define GET_SYMTABS(B) \
73     if (elf->elf_class == ELFCLASS ## B) { \
74     Elf ## B ## _Shdr *symtab, *strtab, *dynsym, *dynstr; \
75     /* debug sections */ \
76     symtab = SHDR ## B (elf_findsecbyname(elf, ".symtab")); \
77     strtab = SHDR ## B (elf_findsecbyname(elf, ".strtab")); \
78     /* runtime sections */ \
79     dynsym = SHDR ## B (elf_findsecbyname(elf, ".dynsym")); \
80     dynstr = SHDR ## B (elf_findsecbyname(elf, ".dynstr")); \
81     if (symtab && dynsym) { \
82     *sym = (void*)((EGET(symtab->sh_size) > EGET(dynsym->sh_size)) ? symtab : dynsym); \
83     } else { \
84     *sym = (void*)(symtab ? symtab : dynsym); \
85     } \
86     if (strtab && dynstr) { \
87     *tab = (void*)((EGET(strtab->sh_size) > EGET(dynstr->sh_size)) ? strtab : dynstr); \
88     } else { \
89     *tab = (void*)(strtab ? strtab : dynstr); \
90     } \
91     }
92     GET_SYMTABS(32)
93     GET_SYMTABS(64)
94     }
95 vapier 1.41 static char *scanelf_file_pax(elfobj *elf, char *found_pax)
96 solar 1.6 {
97 solar 1.61 static char ret[7];
98     unsigned long i, shown;
99    
100 vapier 1.41 if (!show_pax) return NULL;
101 vapier 1.10
102 solar 1.61 shown = 0;
103     memset(&ret, 0, sizeof(ret));
104    
105     if (elf->phdr) {
106     #define SHOW_PAX(B) \
107     if (elf->elf_class == ELFCLASS ## B) { \
108     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
109     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
110     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
111     if (EGET(phdr[i].p_type) != PT_PAX_FLAGS) \
112     continue; \
113     if (be_quiet && (EGET(phdr[i].p_flags) == 10240)) \
114     continue; \
115     memcpy(ret, pax_short_pf_flags(EGET(phdr[i].p_flags)), 6); \
116     *found_pax = 1; \
117     ++shown; \
118     break; \
119     } \
120     }
121     SHOW_PAX(32)
122     SHOW_PAX(64)
123     }
124    
125     /* fall back to EI_PAX if no PT_PAX was found */
126     if (!*ret) {
127 vapier 1.90 static char *paxflags;
128 solar 1.61 paxflags = pax_short_hf_flags(EI_PAX_FLAGS(elf));
129     if (!be_quiet || (be_quiet && EI_PAX_FLAGS(elf))) {
130     *found_pax = 1;
131 vapier 1.90 return (be_wewy_wewy_quiet ? NULL : paxflags);
132 solar 1.61 }
133     strncpy(ret, paxflags, sizeof(ret));
134 vapier 1.14 }
135 vapier 1.41
136 vapier 1.90 if (be_wewy_wewy_quiet || (be_quiet && !shown))
137 solar 1.61 return NULL;
138 vapier 1.90 else
139     return ret;
140     }
141 solar 1.61
142 solar 1.73 static char *scanelf_file_phdr(elfobj *elf, char *found_phdr, char *found_relro, char *found_load)
143 vapier 1.39 {
144 vapier 1.71 static char ret[12];
145 vapier 1.41 char *found;
146 vapier 1.99 unsigned long i, shown, multi_stack, multi_relro, multi_load;
147     int max_pt_load;
148 vapier 1.41
149 solar 1.73 if (!show_phdr) return NULL;
150 vapier 1.41
151 vapier 1.71 memcpy(ret, "--- --- ---\0", 12);
152    
153 vapier 1.41 shown = 0;
154 vapier 1.71 multi_stack = multi_relro = multi_load = 0;
155 vapier 1.99 max_pt_load = elf_max_pt_load(elf);
156 vapier 1.44
157 vapier 1.108 #define NOTE_GNU_STACK ".note.GNU-stack"
158 solar 1.73 #define SHOW_PHDR(B) \
159 vapier 1.39 if (elf->elf_class == ELFCLASS ## B) { \
160     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
161 vapier 1.91 Elf ## B ## _Off offset; \
162     uint32_t flags, check_flags; \
163     if (elf->phdr != NULL) { \
164     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
165     for (i = 0; i < EGET(ehdr->e_phnum); ++i) { \
166     if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
167     if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
168     found = found_phdr; \
169     offset = 0; \
170     check_flags = PF_X; \
171     } else if (EGET(phdr[i].p_type) == PT_GNU_RELRO) { \
172     if (multi_relro++) warnf("%s: multiple PT_GNU_RELRO's !?", elf->filename); \
173     found = found_relro; \
174     offset = 4; \
175     check_flags = PF_X; \
176     } else if (EGET(phdr[i].p_type) == PT_LOAD) { \
177 vapier 1.99 if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
178 vapier 1.91 found = found_load; \
179     offset = 8; \
180     check_flags = PF_W|PF_X; \
181     } else \
182     continue; \
183     flags = EGET(phdr[i].p_flags); \
184     if (be_quiet && ((flags & check_flags) != check_flags)) \
185     continue; \
186 vapier 1.101 if (fix_elf && ((flags & PF_X) != flags)) { \
187     ESET(phdr[i].p_flags, flags & (PF_X ^ (size_t)-1)); \
188     ret[3] = ret[7] = '!'; \
189     flags = EGET(phdr[i].p_flags); \
190     } \
191 vapier 1.91 memcpy(ret+offset, gnu_short_stack_flags(flags), 3); \
192     *found = 1; \
193     ++shown; \
194     } \
195     } else if (elf->shdr != NULL) { \
196     /* no program headers which means this is prob an object file */ \
197     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
198     Elf ## B ## _Shdr *strtbl = shdr + EGET(ehdr->e_shstrndx); \
199 vapier 1.108 char *str; \
200     if ((void*)strtbl > (void*)(elf->data + sizeof(*strtbl))) \
201     goto skip_this_shdr##B; \
202 vapier 1.91 check_flags = SHF_WRITE|SHF_EXECINSTR; \
203     for (i = 0; i < EGET(ehdr->e_shnum); ++i) { \
204     if (EGET(shdr[i].sh_type) != SHT_PROGBITS) continue; \
205     offset = EGET(strtbl->sh_offset) + EGET(shdr[i].sh_name); \
206 vapier 1.108 str = elf->data + offset; \
207     if (str > elf->data + offset + sizeof(NOTE_GNU_STACK)) continue; \
208     if (!strcmp(str, NOTE_GNU_STACK)) { \
209 vapier 1.91 if (multi_stack++) warnf("%s: multiple .note.GNU-stack's !?", elf->filename); \
210     flags = EGET(shdr[i].sh_flags); \
211     if (be_quiet && ((flags & check_flags) != check_flags)) \
212     continue; \
213     ++*found_phdr; \
214     shown = 1; \
215     if (flags & SHF_WRITE) ret[0] = 'W'; \
216     if (flags & SHF_ALLOC) ret[1] = 'A'; \
217     if (flags & SHF_EXECINSTR) ret[2] = 'X'; \
218     if (flags & 0xFFFFFFF8) warn("Invalid section flags for GNU-stack"); \
219     break; \
220     } \
221     } \
222 vapier 1.108 skip_this_shdr##B: \
223 vapier 1.91 if (!multi_stack) { \
224     *found_phdr = 1; \
225     shown = 1; \
226     memcpy(ret, "!WX", 3); \
227     } \
228 vapier 1.39 } \
229     }
230 solar 1.73 SHOW_PHDR(32)
231     SHOW_PHDR(64)
232 vapier 1.44
233 vapier 1.90 if (be_wewy_wewy_quiet || (be_quiet && !shown))
234 vapier 1.41 return NULL;
235     else
236     return ret;
237 vapier 1.39 }
238 vapier 1.90 static const char *scanelf_file_textrel(elfobj *elf, char *found_textrel)
239 vapier 1.39 {
240 vapier 1.90 static const char *ret = "TEXTREL";
241 vapier 1.44 unsigned long i;
242 vapier 1.41
243 vapier 1.79 if (!show_textrel && !show_textrels) return NULL;
244 vapier 1.41
245 vapier 1.44 if (elf->phdr) {
246 vapier 1.39 #define SHOW_TEXTREL(B) \
247     if (elf->elf_class == ELFCLASS ## B) { \
248     Elf ## B ## _Dyn *dyn; \
249     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
250     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
251 vapier 1.44 Elf ## B ## _Off offset; \
252 vapier 1.39 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
253 vapier 1.59 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
254 vapier 1.44 offset = EGET(phdr[i].p_offset); \
255     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
256     dyn = DYN ## B (elf->data + offset); \
257 vapier 1.39 while (EGET(dyn->d_tag) != DT_NULL) { \
258     if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
259     *found_textrel = 1; \
260     /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
261 vapier 1.70 return (be_wewy_wewy_quiet ? NULL : ret); \
262 vapier 1.39 } \
263     ++dyn; \
264 vapier 1.26 } \
265 vapier 1.39 } }
266     SHOW_TEXTREL(32)
267     SHOW_TEXTREL(64)
268 vapier 1.44 }
269    
270 vapier 1.70 if (be_quiet || be_wewy_wewy_quiet)
271 vapier 1.41 return NULL;
272     else
273 vapier 1.90 return " - ";
274 vapier 1.39 }
275 vapier 1.79 static char *scanelf_file_textrels(elfobj *elf, char *found_textrels, char *found_textrel)
276 vapier 1.76 {
277 vapier 1.82 unsigned long s, r, rmax;
278     void *symtab_void, *strtab_void, *text_void;
279 vapier 1.76
280     if (!show_textrels) return NULL;
281    
282 vapier 1.79 /* don't search for TEXTREL's if the ELF doesn't have any */
283     if (!*found_textrel) scanelf_file_textrel(elf, found_textrel);
284     if (!*found_textrel) return NULL;
285    
286 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
287 vapier 1.82 text_void = elf_findsecbyname(elf, ".text");
288 vapier 1.76
289 vapier 1.82 if (symtab_void && strtab_void && text_void && elf->shdr) {
290 vapier 1.76 #define SHOW_TEXTRELS(B) \
291     if (elf->elf_class == ELFCLASS ## B) { \
292     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
293     Elf ## B ## _Shdr *shdr = SHDR ## B (elf->shdr); \
294     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
295     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
296 vapier 1.82 Elf ## B ## _Shdr *text = SHDR ## B (text_void); \
297     Elf ## B ## _Addr vaddr = EGET(text->sh_addr); \
298     uint ## B ## _t memsz = EGET(text->sh_size); \
299 vapier 1.76 Elf ## B ## _Rel *rel; \
300     Elf ## B ## _Rela *rela; \
301     /* search the section headers for relocations */ \
302     for (s = 0; s < EGET(ehdr->e_shnum); ++s) { \
303     uint32_t sh_type = EGET(shdr[s].sh_type); \
304     if (sh_type == SHT_REL) { \
305     rel = REL ## B (elf->data + EGET(shdr[s].sh_offset)); \
306     rela = NULL; \
307     rmax = EGET(shdr[s].sh_size) / sizeof(*rel); \
308     } else if (sh_type == SHT_RELA) { \
309     rel = NULL; \
310     rela = RELA ## B (elf->data + EGET(shdr[s].sh_offset)); \
311     rmax = EGET(shdr[s].sh_size) / sizeof(*rela); \
312     } else \
313     continue; \
314 vapier 1.82 /* now see if any of the relocs are in the .text */ \
315     for (r = 0; r < rmax; ++r) { \
316     unsigned long sym_max; \
317     Elf ## B ## _Addr offset_tmp; \
318     Elf ## B ## _Sym *func; \
319     Elf ## B ## _Sym *sym; \
320     Elf ## B ## _Addr r_offset; \
321     uint ## B ## _t r_info; \
322     if (sh_type == SHT_REL) { \
323     r_offset = EGET(rel[r].r_offset); \
324     r_info = EGET(rel[r].r_info); \
325     } else { \
326     r_offset = EGET(rela[r].r_offset); \
327     r_info = EGET(rela[r].r_info); \
328     } \
329     /* make sure this relocation is inside of the .text */ \
330     if (r_offset < vaddr || r_offset >= vaddr + memsz) { \
331     if (be_verbose <= 2) continue; \
332     } else \
333 vapier 1.78 *found_textrels = 1; \
334 vapier 1.82 /* locate this relocation symbol name */ \
335     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
336 vapier 1.110 if ((void*)sym > (void*)elf->data) { \
337 vapier 1.109 warn("corrupt ELF symbol"); \
338     continue; \
339     } \
340 vapier 1.82 sym_max = ELF ## B ## _R_SYM(r_info); \
341     if (sym_max * EGET(symtab->sh_entsize) < symtab->sh_size) \
342     sym += sym_max; \
343     else \
344     sym = NULL; \
345     sym_max = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
346     /* show the raw details about this reloc */ \
347 vapier 1.88 printf(" %s: ", elf->base_filename); \
348 vapier 1.82 if (sym && sym->st_name) \
349     printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name))); \
350     else \
351 vapier 1.88 printf("(memory/fake?)"); \
352 vapier 1.82 printf(" [0x%lX]", (unsigned long)r_offset); \
353     /* now try to find the closest symbol that this rel is probably in */ \
354     sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
355     func = NULL; \
356     offset_tmp = 0; \
357     while (sym_max--) { \
358     if (EGET(sym->st_value) < r_offset && EGET(sym->st_value) > offset_tmp) { \
359     func = sym; \
360     offset_tmp = EGET(sym->st_value); \
361 vapier 1.76 } \
362 vapier 1.82 ++sym; \
363 vapier 1.76 } \
364 vapier 1.82 printf(" in "); \
365     if (func && func->st_name) \
366     printf("%s", (char*)(elf->data + EGET(strtab->sh_offset) + EGET(func->st_name))); \
367     else \
368     printf("(NULL: fake?)"); \
369     printf(" [0x%lX]\n", (unsigned long)offset_tmp); \
370 vapier 1.76 } \
371     } }
372     SHOW_TEXTRELS(32)
373     SHOW_TEXTRELS(64)
374     }
375 vapier 1.82 if (!*found_textrels)
376     warnf("ELF %s has TEXTREL markings but doesnt appear to have any real TEXTREL's !?", elf->filename);
377 vapier 1.76
378     return NULL;
379     }
380 solar 1.83
381 vapier 1.102 static void rpath_security_checks(elfobj *, char *, const char *);
382     static void rpath_security_checks(elfobj *elf, char *item, const char *dt_type)
383 vapier 1.100 {
384 solar 1.83 struct stat st;
385 vapier 1.84 switch (*item) {
386 vapier 1.89 case '/': break;
387     case '.':
388 vapier 1.102 warnf("Security problem with relative %s '%s' in %s", dt_type, item, elf->filename);
389 vapier 1.89 break;
390 vapier 1.100 case ':':
391 vapier 1.89 case '\0':
392 vapier 1.102 warnf("Security problem NULL %s in %s", dt_type, elf->filename);
393 solar 1.83 break;
394     case '$':
395 vapier 1.84 if (fstat(elf->fd, &st) != -1)
396 solar 1.83 if ((st.st_mode & S_ISUID) || (st.st_mode & S_ISGID))
397 vapier 1.102 warnf("Security problem with %s='%s' in %s with mode set of %o",
398     dt_type, item, elf->filename, st.st_mode & 07777);
399 solar 1.83 break;
400     default:
401 vapier 1.102 warnf("Maybe? sec problem with %s='%s' in %s", dt_type, item, elf->filename);
402 solar 1.83 break;
403     }
404     }
405 vapier 1.41 static void scanelf_file_rpath(elfobj *elf, char *found_rpath, char **ret, size_t *ret_len)
406 vapier 1.39 {
407 vapier 1.48 unsigned long i, s;
408     char *rpath, *runpath, **r;
409 vapier 1.39 void *strtbl_void;
410 vapier 1.10
411 vapier 1.39 if (!show_rpath) return;
412 vapier 1.10
413 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
414     rpath = runpath = NULL;
415 vapier 1.10
416 vapier 1.44 if (elf->phdr && strtbl_void) {
417 vapier 1.26 #define SHOW_RPATH(B) \
418     if (elf->elf_class == ELFCLASS ## B) { \
419     Elf ## B ## _Dyn *dyn; \
420     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
421     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
422     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
423 vapier 1.44 Elf ## B ## _Off offset; \
424 vapier 1.60 Elf ## B ## _Xword word; \
425 vapier 1.48 /* Scan all the program headers */ \
426 vapier 1.26 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
427 vapier 1.48 /* Just scan dynamic headers */ \
428 vapier 1.26 if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
429 vapier 1.44 offset = EGET(phdr[i].p_offset); \
430     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
431 vapier 1.48 /* Just scan dynamic RPATH/RUNPATH headers */ \
432 vapier 1.44 dyn = DYN ## B (elf->data + offset); \
433 vapier 1.48 while ((word=EGET(dyn->d_tag)) != DT_NULL) { \
434     if (word == DT_RPATH) { \
435     r = &rpath; \
436     } else if (word == DT_RUNPATH) { \
437     r = &runpath; \
438     } else { \
439     ++dyn; \
440     continue; \
441     } \
442     /* Verify the memory is somewhat sane */ \
443     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
444 vapier 1.69 if (offset < (Elf ## B ## _Off)elf->len) { \
445 vapier 1.48 if (*r) warn("ELF has multiple %s's !?", get_elfdtype(word)); \
446     *r = (char*)(elf->data + offset); \
447 vapier 1.103 /* cache the length in case we need to nuke this section later on */ \
448     if (fix_elf) \
449     offset = strlen(*r); \
450 vapier 1.48 /* If quiet, don't output paths in ld.so.conf */ \
451 vapier 1.69 if (be_quiet) { \
452     size_t len; \
453     char *start, *end; \
454 vapier 1.75 /* note that we only 'chop' off leading known paths. */ \
455     /* since *r is read-only memory, we can only move the ptr forward. */ \
456     start = *r; \
457     /* scan each path in : delimited list */ \
458     while (start) { \
459 vapier 1.102 rpath_security_checks(elf, start, get_elfdtype(word)); \
460 vapier 1.69 end = strchr(start, ':'); \
461 vapier 1.75 len = (end ? abs(end - start) : strlen(start)); \
462 vapier 1.102 if (use_ldcache) \
463     for (s = 0; ldpaths[s]; ++s) \
464     if (!strncmp(ldpaths[s], start, len) && !ldpaths[s][len]) { \
465     *r = end; \
466     /* corner case ... if RPATH reads "/usr/lib:", we want \
467     * to show ':' rather than '' */ \
468     if (end && end[1] != '\0') \
469     (*r)++; \
470     break; \
471     } \
472 vapier 1.100 if (!*r || !end) \
473     break; \
474 vapier 1.75 else \
475     start = start + len + 1; \
476 vapier 1.69 } \
477     } \
478 vapier 1.101 if (*r) { \
479 solar 1.107 if (fix_elf > 2 || (fix_elf && **r == '\0')) { \
480 vapier 1.101 /* just nuke it */ \
481     nuke_it##B: \
482 vapier 1.103 memset(*r, 0x00, offset); \
483 vapier 1.102 *r = NULL; \
484 vapier 1.101 ESET(dyn->d_tag, DT_DEBUG); \
485 vapier 1.103 ESET(dyn->d_un.d_ptr, 0); \
486 vapier 1.101 } else if (fix_elf) { \
487     /* try to clean "bad" paths */ \
488     size_t len, tmpdir_len; \
489     char *start, *end; \
490     const char *tmpdir; \
491     start = *r; \
492     tmpdir = (getenv("TMPDIR") ? : "."); \
493     tmpdir_len = strlen(tmpdir); \
494     while (1) { \
495     end = strchr(start, ':'); \
496     if (start == end) { \
497     eat_this_path##B: \
498     len = strlen(end); \
499     memmove(start, end+1, len); \
500     start[len-1] = '\0'; \
501     end = start - 1; \
502     } else if (tmpdir && !strncmp(start, tmpdir, tmpdir_len)) { \
503     if (!end) { \
504     if (start == *r) \
505     goto nuke_it##B; \
506     *--start = '\0'; \
507     } else \
508     goto eat_this_path##B; \
509     } \
510     if (!end) \
511     break; \
512     start = end + 1; \
513     } \
514 vapier 1.102 if (**r == '\0') \
515     goto nuke_it##B; \
516 vapier 1.101 } \
517 vapier 1.102 if (*r) \
518     *found_rpath = 1; \
519 vapier 1.101 } \
520 vapier 1.26 } \
521     ++dyn; \
522     } \
523     } }
524     SHOW_RPATH(32)
525     SHOW_RPATH(64)
526 vapier 1.10 }
527 vapier 1.41
528 vapier 1.70 if (be_wewy_wewy_quiet) return;
529    
530 vapier 1.39 if (rpath && runpath) {
531 vapier 1.41 if (!strcmp(rpath, runpath)) {
532     xstrcat(ret, runpath, ret_len);
533     } else {
534 vapier 1.39 fprintf(stderr, "RPATH [%s] != RUNPATH [%s]\n", rpath, runpath);
535 vapier 1.41 xchrcat(ret, '{', ret_len);
536     xstrcat(ret, rpath, ret_len);
537     xchrcat(ret, ',', ret_len);
538     xstrcat(ret, runpath, ret_len);
539     xchrcat(ret, '}', ret_len);
540 vapier 1.39 }
541     } else if (rpath || runpath)
542 vapier 1.41 xstrcat(ret, (runpath ? runpath : rpath), ret_len);
543     else if (!be_quiet)
544     xstrcat(ret, " - ", ret_len);
545 vapier 1.39 }
546 solar 1.96
547     #define LDSO_CACHE_MAGIC "ld.so-"
548     #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
549     #define LDSO_CACHE_VER "1.7.0"
550     #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
551 vapier 1.97 #define FLAG_ANY -1
552     #define FLAG_TYPE_MASK 0x00ff
553     #define FLAG_LIBC4 0x0000
554     #define FLAG_ELF 0x0001
555     #define FLAG_ELF_LIBC5 0x0002
556     #define FLAG_ELF_LIBC6 0x0003
557     #define FLAG_REQUIRED_MASK 0xff00
558     #define FLAG_SPARC_LIB64 0x0100
559     #define FLAG_IA64_LIB64 0x0200
560     #define FLAG_X8664_LIB64 0x0300
561     #define FLAG_S390_LIB64 0x0400
562     #define FLAG_POWERPC_LIB64 0x0500
563     #define FLAG_MIPS64_LIBN32 0x0600
564     #define FLAG_MIPS64_LIBN64 0x0700
565 solar 1.96
566 vapier 1.97 static char *lookup_cache_lib(elfobj *, char *);
567     static char *lookup_cache_lib(elfobj *elf, char *fname)
568 solar 1.96 {
569     int fd = 0;
570     char *strs;
571 vapier 1.104 static char buf[__PAX_UTILS_PATH_MAX] = "";
572 solar 1.96 const char *cachefile = "/etc/ld.so.cache";
573     struct stat st;
574    
575     typedef struct {
576     char magic[LDSO_CACHE_MAGIC_LEN];
577     char version[LDSO_CACHE_VER_LEN];
578     int nlibs;
579     } header_t;
580 vapier 1.97 header_t *header;
581 solar 1.96
582     typedef struct {
583     int flags;
584     int sooffset;
585     int liboffset;
586     } libentry_t;
587     libentry_t *libent;
588    
589     if (fname == NULL)
590     return NULL;
591    
592     if (ldcache == 0) {
593 vapier 1.97 if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY)) == -1)
594 solar 1.96 return NULL;
595 vapier 1.97
596     /* cache these values so we only map/unmap the cache file once */
597 solar 1.96 ldcache_size = st.st_size;
598 vapier 1.97 ldcache = mmap(0, ldcache_size, PROT_READ, MAP_SHARED, fd, 0);
599    
600     close(fd);
601 solar 1.96
602 vapier 1.97 if (ldcache == (caddr_t)-1)
603 solar 1.96 return NULL;
604    
605     if (memcmp(((header_t *) ldcache)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN))
606     return NULL;
607     if (memcmp (((header_t *) ldcache)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN))
608     return NULL;
609     }
610    
611     header = (header_t *) ldcache;
612     libent = (libentry_t *) (ldcache + sizeof(header_t));
613     strs = (char *) &libent[header->nlibs];
614    
615     for (fd = 0; fd < header->nlibs; fd++) {
616 vapier 1.97 /* this should be more fine grained, but for now we assume that
617     * diff arches will not be cached together. and we ignore the
618     * the different multilib mips cases. */
619     if (elf->elf_class == ELFCLASS64 && !(libent[fd].flags & FLAG_REQUIRED_MASK))
620     continue;
621     if (elf->elf_class == ELFCLASS32 && (libent[fd].flags & FLAG_REQUIRED_MASK))
622     continue;
623    
624 solar 1.96 if (strcmp(fname, strs + libent[fd].sooffset) != 0)
625     continue;
626     strncpy(buf, strs + libent[fd].liboffset, sizeof(buf));
627     }
628     return buf;
629     }
630    
631    
632 vapier 1.84 static const char *scanelf_file_needed_lib(elfobj *elf, char *found_needed, char *found_lib, int op, char **ret, size_t *ret_len)
633 vapier 1.39 {
634 vapier 1.44 unsigned long i;
635 vapier 1.39 char *needed;
636     void *strtbl_void;
637 solar 1.96 char *p;
638 vapier 1.39
639 vapier 1.72 if ((op==0 && !show_needed) || (op==1 && !find_lib)) return NULL;
640 vapier 1.10
641 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".dynstr");
642 vapier 1.32
643 vapier 1.44 if (elf->phdr && strtbl_void) {
644 vapier 1.32 #define SHOW_NEEDED(B) \
645     if (elf->elf_class == ELFCLASS ## B) { \
646     Elf ## B ## _Dyn *dyn; \
647     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
648     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
649     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
650 vapier 1.44 Elf ## B ## _Off offset; \
651 vapier 1.32 for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
652     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
653 vapier 1.44 offset = EGET(phdr[i].p_offset); \
654     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
655     dyn = DYN ## B (elf->data + offset); \
656 vapier 1.32 while (EGET(dyn->d_tag) != DT_NULL) { \
657     if (EGET(dyn->d_tag) == DT_NEEDED) { \
658 vapier 1.44 offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
659 vapier 1.69 if (offset >= (Elf ## B ## _Off)elf->len) { \
660 vapier 1.49 ++dyn; \
661     continue; \
662     } \
663 vapier 1.44 needed = (char*)(elf->data + offset); \
664 vapier 1.72 if (op == 0) { \
665     if (!be_wewy_wewy_quiet) { \
666     if (*found_needed) xchrcat(ret, ',', ret_len); \
667 vapier 1.102 if (use_ldcache) \
668 vapier 1.97 if ((p = lookup_cache_lib(elf, needed)) != NULL) \
669 solar 1.96 needed = p; \
670 vapier 1.72 xstrcat(ret, needed, ret_len); \
671     } \
672     *found_needed = 1; \
673     } else { \
674 solar 1.86 if (!strncmp(find_lib, needed, strlen( !gmatch ? needed : find_lib))) { \
675 vapier 1.81 *found_lib = 1; \
676 solar 1.86 return (be_wewy_wewy_quiet ? NULL : needed); \
677 vapier 1.81 } \
678 vapier 1.72 } \
679 vapier 1.32 } \
680     ++dyn; \
681     } \
682     } }
683     SHOW_NEEDED(32)
684     SHOW_NEEDED(64)
685 vapier 1.85 if (op == 0 && !*found_needed && be_verbose)
686 vapier 1.84 warn("ELF lacks DT_NEEDED sections: %s", elf->filename);
687 vapier 1.32 }
688 vapier 1.72
689     return NULL;
690 vapier 1.39 }
691 vapier 1.41 static char *scanelf_file_interp(elfobj *elf, char *found_interp)
692 vapier 1.39 {
693     void *strtbl_void;
694    
695 vapier 1.41 if (!show_interp) return NULL;
696 vapier 1.32
697 vapier 1.39 strtbl_void = elf_findsecbyname(elf, ".interp");
698 vapier 1.38
699 vapier 1.39 if (strtbl_void) {
700 vapier 1.38 #define SHOW_INTERP(B) \
701     if (elf->elf_class == ELFCLASS ## B) { \
702 solar 1.40 Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
703     *found_interp = 1; \
704 vapier 1.70 return (be_wewy_wewy_quiet ? NULL : elf->data + EGET(strtbl->sh_offset)); \
705 vapier 1.38 }
706     SHOW_INTERP(32)
707     SHOW_INTERP(64)
708     }
709 vapier 1.41 return NULL;
710 vapier 1.39 }
711 vapier 1.49 static char *scanelf_file_bind(elfobj *elf, char *found_bind)
712     {
713     unsigned long i;
714     struct stat s;
715    
716     if (!show_bind) return NULL;
717 vapier 1.51 if (!elf->phdr) return NULL;
718 vapier 1.49
719     #define SHOW_BIND(B) \
720     if (elf->elf_class == ELFCLASS ## B) { \
721     Elf ## B ## _Dyn *dyn; \
722     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
723     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
724     Elf ## B ## _Off offset; \
725     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
726     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
727     offset = EGET(phdr[i].p_offset); \
728     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
729     dyn = DYN ## B (elf->data + offset); \
730     while (EGET(dyn->d_tag) != DT_NULL) { \
731     if (EGET(dyn->d_tag) == DT_BIND_NOW || \
732     (EGET(dyn->d_tag) == DT_FLAGS && EGET(dyn->d_un.d_val) & DF_BIND_NOW)) \
733     { \
734     if (be_quiet) return NULL; \
735     *found_bind = 1; \
736 vapier 1.70 return (char *)(be_wewy_wewy_quiet ? NULL : "NOW"); \
737 vapier 1.49 } \
738     ++dyn; \
739     } \
740     } \
741     }
742     SHOW_BIND(32)
743     SHOW_BIND(64)
744    
745 vapier 1.70 if (be_wewy_wewy_quiet) return NULL;
746    
747 vapier 1.56 if (be_quiet && !fstat(elf->fd, &s) && !(s.st_mode & S_ISUID || s.st_mode & S_ISGID)) {
748 vapier 1.49 return NULL;
749     } else {
750     *found_bind = 1;
751 solar 1.68 return (char *) "LAZY";
752 vapier 1.49 }
753     }
754 vapier 1.84 static char *scanelf_file_soname(elfobj *elf, char *found_soname)
755     {
756     unsigned long i;
757     char *soname;
758     void *strtbl_void;
759    
760     if (!show_soname) return NULL;
761    
762     strtbl_void = elf_findsecbyname(elf, ".dynstr");
763    
764     if (elf->phdr && strtbl_void) {
765     #define SHOW_SONAME(B) \
766     if (elf->elf_class == ELFCLASS ## B) { \
767     Elf ## B ## _Dyn *dyn; \
768     Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
769     Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
770     Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
771     Elf ## B ## _Off offset; \
772     /* only look for soname in shared objects */ \
773     if (ehdr->e_type != ET_DYN) \
774     return NULL; \
775     for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
776     if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
777     offset = EGET(phdr[i].p_offset); \
778     if (offset >= elf->len - sizeof(Elf ## B ## _Dyn)) continue; \
779     dyn = DYN ## B (elf->data + offset); \
780     while (EGET(dyn->d_tag) != DT_NULL) { \
781     if (EGET(dyn->d_tag) == DT_SONAME) { \
782     offset = EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
783     if (offset >= (Elf ## B ## _Off)elf->len) { \
784     ++dyn; \
785     continue; \
786     } \
787     soname = (char*)(elf->data + offset); \
788     *found_soname = 1; \
789     return (be_wewy_wewy_quiet ? NULL : soname); \
790     } \
791     ++dyn; \
792     } \
793     } }
794     SHOW_SONAME(32)
795     SHOW_SONAME(64)
796     }
797    
798     return NULL;
799     }
800 vapier 1.72 static char *scanelf_file_sym(elfobj *elf, char *found_sym)
801 vapier 1.39 {
802 vapier 1.44 unsigned long i;
803 vapier 1.95 char *ret;
804 vapier 1.39 void *symtab_void, *strtab_void;
805 vapier 1.38
806 vapier 1.41 if (!find_sym) return NULL;
807 vapier 1.95 ret = find_sym;
808 vapier 1.32
809 vapier 1.77 scanelf_file_get_symtabs(elf, &symtab_void, &strtab_void);
810 vapier 1.27
811 vapier 1.39 if (symtab_void && strtab_void) {
812 vapier 1.27 #define FIND_SYM(B) \
813     if (elf->elf_class == ELFCLASS ## B) { \
814     Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
815     Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
816     Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
817 vapier 1.44 unsigned long cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
818 vapier 1.27 char *symname; \
819     for (i = 0; i < cnt; ++i) { \
820     if (sym->st_name) { \
821     symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
822 solar 1.28 if (*find_sym == '*') { \
823 vapier 1.32 printf("%s(%s) %5lX %15s %s\n", \
824 vapier 1.39 ((*found_sym == 0) ? "\n\t" : "\t"), \
825 vapier 1.76 elf->base_filename, \
826 vapier 1.94 (unsigned long)sym->st_size, \
827 vapier 1.95 get_elfstttype(sym->st_info), \
828 vapier 1.32 symname); \
829 vapier 1.39 *found_sym = 1; \
830 vapier 1.95 } else { \
831     char *this_sym, *next_sym; \
832     this_sym = find_sym; \
833     do { \
834     next_sym = strchr(this_sym, ','); \
835     if (next_sym == NULL) \
836     next_sym = this_sym + strlen(this_sym); \
837     if ((strncmp(this_sym, symname, (next_sym-this_sym)) == 0 && symname[next_sym-this_sym] == '\0') || \
838     (strcmp(symname, versioned_symname) == 0)) { \
839     ret = this_sym; \
840     (*found_sym)++; \
841     goto break_out; \
842     } \
843     this_sym = next_sym + 1; \
844     } while (*next_sym != '\0'); \
845     } \
846 vapier 1.27 } \
847     ++sym; \
848     } }
849     FIND_SYM(32)
850     FIND_SYM(64)
851 vapier 1.39 }
852 vapier 1.70
853 vapier 1.95 break_out:
854 vapier 1.70 if (be_wewy_wewy_quiet) return NULL;
855    
856 vapier 1.41 if (*find_sym != '*' && *found_sym)
857 vapier 1.95 return ret;
858 vapier 1.41 if (be_quiet)
859     return NULL;
860     else
861 solar 1.68 return (char *)" - ";
862 vapier 1.39 }
863     /* scan an elf file and show all the fun stuff */
864 solar 1.57 #define prints(str) write(fileno(stdout), str, strlen(str))
865 vapier 1.106 static int scanelf_elfobj(elfobj *elf)
866 vapier 1.39 {
867 vapier 1.44 unsigned long i;
868 solar 1.73 char found_pax, found_phdr, found_relro, found_load, found_textrel,
869 vapier 1.84 found_rpath, found_needed, found_interp, found_bind, found_soname,
870 vapier 1.76 found_sym, found_lib, found_file, found_textrels;
871 vapier 1.41 static char *out_buffer = NULL;
872     static size_t out_len;
873 vapier 1.39
874 vapier 1.76 found_pax = found_phdr = found_relro = found_load = found_textrel = \
875 vapier 1.84 found_rpath = found_needed = found_interp = found_bind = found_soname = \
876 vapier 1.76 found_sym = found_lib = found_file = found_textrels = 0;
877 vapier 1.39
878     if (be_verbose > 1)
879 vapier 1.106 printf("%s: scanning file {%s,%s}\n", elf->filename,
880 vapier 1.69 get_elfeitype(EI_CLASS, elf->elf_class),
881     get_elfeitype(EI_DATA, elf->data[EI_DATA]));
882 vapier 1.39 else if (be_verbose)
883 vapier 1.106 printf("%s: scanning file\n", elf->filename);
884 vapier 1.39
885 vapier 1.41 /* init output buffer */
886     if (!out_buffer) {
887     out_len = sizeof(char) * 80;
888     out_buffer = (char*)xmalloc(out_len);
889     }
890     *out_buffer = '\0';
891    
892 vapier 1.39 /* show the header */
893     if (!be_quiet && show_banner) {
894 vapier 1.49 for (i = 0; out_format[i]; ++i) {
895 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
896 vapier 1.41
897     switch (out_format[++i]) {
898     case '%': break;
899 vapier 1.70 case '#': break;
900 vapier 1.66 case 'F':
901     case 'p':
902     case 'f': prints("FILE "); found_file = 1; break;
903 vapier 1.41 case 'o': prints(" TYPE "); break;
904     case 'x': prints(" PAX "); break;
905 vapier 1.71 case 'e': prints("STK/REL/PTL "); break;
906 vapier 1.41 case 't': prints("TEXTREL "); break;
907     case 'r': prints("RPATH "); break;
908     case 'n': prints("NEEDED "); break;
909     case 'i': prints("INTERP "); break;
910 vapier 1.49 case 'b': prints("BIND "); break;
911 vapier 1.84 case 'S': prints("SONAME "); break;
912 vapier 1.41 case 's': prints("SYM "); break;
913 vapier 1.72 case 'N': prints("LIB "); break;
914 vapier 1.76 case 'T': prints("TEXTRELS "); break;
915     default: warnf("'%c' has no title ?", out_format[i]);
916 vapier 1.39 }
917 vapier 1.27 }
918 vapier 1.49 if (!found_file) prints("FILE ");
919 vapier 1.41 prints("\n");
920 vapier 1.49 found_file = 0;
921 vapier 1.39 show_banner = 0;
922     }
923    
924     /* dump all the good stuff */
925 vapier 1.49 for (i = 0; out_format[i]; ++i) {
926 vapier 1.41 const char *out;
927 vapier 1.66 const char *tmp;
928 vapier 1.41
929     /* make sure we trim leading spaces in quiet mode */
930     if (be_quiet && *out_buffer == ' ' && !out_buffer[1])
931     *out_buffer = '\0';
932 vapier 1.39
933 vapier 1.70 if (!IS_MODIFIER(out_format[i])) {
934 vapier 1.41 xchrcat(&out_buffer, out_format[i], &out_len);
935     continue;
936     }
937 vapier 1.39
938 vapier 1.41 out = NULL;
939 vapier 1.70 be_wewy_wewy_quiet = (out_format[i] == '#');
940 vapier 1.41 switch (out_format[++i]) {
941 vapier 1.70 case '%':
942     case '#':
943     xchrcat(&out_buffer, out_format[i], &out_len); break;
944     case 'F':
945 vapier 1.76 found_file = 1;
946 vapier 1.70 if (be_wewy_wewy_quiet) break;
947 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
948 vapier 1.70 break;
949 vapier 1.66 case 'p':
950 vapier 1.76 found_file = 1;
951 vapier 1.70 if (be_wewy_wewy_quiet) break;
952 vapier 1.106 tmp = elf->filename;
953 vapier 1.66 if (search_path) {
954     ssize_t len_search = strlen(search_path);
955 vapier 1.106 ssize_t len_file = strlen(elf->filename);
956     if (!strncmp(elf->filename, search_path, len_search) && \
957 vapier 1.66 len_file > len_search)
958     tmp += len_search;
959     if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
960     }
961     xstrcat(&out_buffer, tmp, &out_len);
962     break;
963     case 'f':
964 vapier 1.76 found_file = 1;
965 vapier 1.70 if (be_wewy_wewy_quiet) break;
966 vapier 1.106 tmp = strrchr(elf->filename, '/');
967     tmp = (tmp == NULL ? elf->filename : tmp+1);
968 vapier 1.66 xstrcat(&out_buffer, tmp, &out_len);
969     break;
970 vapier 1.41 case 'o': out = get_elfetype(elf); break;
971     case 'x': out = scanelf_file_pax(elf, &found_pax); break;
972 solar 1.73 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
973 vapier 1.41 case 't': out = scanelf_file_textrel(elf, &found_textrel); break;
974 vapier 1.79 case 'T': out = scanelf_file_textrels(elf, &found_textrels, &found_textrel); break;
975 vapier 1.41 case 'r': scanelf_file_rpath(elf, &found_rpath, &out_buffer, &out_len); break;
976 vapier 1.72 case 'n':
977     case 'N': out = scanelf_file_needed_lib(elf, &found_needed, &found_lib, (out_format[i]=='N'), &out_buffer, &out_len); break;
978 vapier 1.41 case 'i': out = scanelf_file_interp(elf, &found_interp); break;
979 vapier 1.49 case 'b': out = scanelf_file_bind(elf, &found_bind); break;
980 vapier 1.84 case 'S': out = scanelf_file_soname(elf, &found_soname); break;
981 vapier 1.72 case 's': out = scanelf_file_sym(elf, &found_sym); break;
982 vapier 1.76 default: warnf("'%c' has no scan code?", out_format[i]);
983 vapier 1.29 }
984 vapier 1.95 if (out) {
985     /* hack for comma delimited output like `scanelf -s sym1,sym2,sym3` */
986     if (out_format[i] == 's' && (tmp=strchr(out,',')) != NULL)
987     xstrncat(&out_buffer, out, &out_len, (tmp-out));
988     else
989     xstrcat(&out_buffer, out, &out_len);
990     }
991 vapier 1.39 }
992    
993 vapier 1.54 #define FOUND_SOMETHING() \
994 solar 1.73 (found_pax || found_phdr || found_relro || found_load || found_textrel || \
995 vapier 1.76 found_rpath || found_needed || found_interp || found_bind || \
996 vapier 1.84 found_soname || found_sym || found_lib || found_textrels)
997 vapier 1.54
998     if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
999     xchrcat(&out_buffer, ' ', &out_len);
1000 vapier 1.106 xstrcat(&out_buffer, elf->filename, &out_len);
1001 vapier 1.27 }
1002 vapier 1.79 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
1003 vapier 1.41 puts(out_buffer);
1004 vapier 1.79 fflush(stdout);
1005     }
1006 vapier 1.10
1007 vapier 1.105 return 0;
1008     }
1009    
1010 vapier 1.106 /* scan a single elf */
1011     static int scanelf_elf(const char *filename, int fd, size_t len)
1012     {
1013     int ret;
1014     elfobj *elf;
1015    
1016     /* verify this is real ELF */
1017     if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1018     if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1019     return 1;
1020     }
1021    
1022     ret = scanelf_elfobj(elf);
1023     unreadelf(elf);
1024     return ret;
1025     }
1026 vapier 1.105 /* scan an archive of elfs */
1027 vapier 1.106 static int scanelf_archive(const char *filename, int fd, size_t len)
1028 vapier 1.105 {
1029 vapier 1.106 archive_handle *ar;
1030 vapier 1.105 archive_member *m;
1031 vapier 1.106 char *ar_buffer;
1032     elfobj *elf;
1033    
1034     ar = ar_open_fd(filename, fd);
1035     if (ar == NULL)
1036     return 1;
1037    
1038     ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1039     while ((m=ar_next(ar)) != NULL) {
1040     elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1041     if (elf) {
1042     scanelf_elfobj(elf);
1043     unreadelf(elf);
1044     }
1045     }
1046     munmap(ar_buffer, len);
1047    
1048 vapier 1.105 return 0;
1049     }
1050     /* scan a file which may be an elf or an archive or some other magical beast */
1051     static void scanelf_file(const char *filename)
1052     {
1053     struct stat st;
1054 vapier 1.106 int fd;
1055 vapier 1.105
1056     /* make sure 'filename' exists */
1057     if (lstat(filename, &st) == -1) {
1058     if (be_verbose > 2) printf("%s: does not exist\n", filename);
1059     return;
1060     }
1061    
1062     /* always handle regular files and handle symlinked files if no -y */
1063     if (S_ISLNK(st.st_mode)) {
1064     if (!scan_symlink) return;
1065     stat(filename, &st);
1066     }
1067     if (!S_ISREG(st.st_mode)) {
1068     if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1069     return;
1070     }
1071    
1072 vapier 1.106 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1073     return;
1074    
1075     if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1076 vapier 1.105 /* if it isn't an ELF, maybe it's an .a archive */
1077 vapier 1.106 scanelf_archive(filename, fd, st.st_size);
1078    
1079     close(fd);
1080 solar 1.6 }
1081    
1082 solar 1.1 /* scan a directory for ET_EXEC files and print when we find one */
1083 vapier 1.10 static void scanelf_dir(const char *path)
1084 solar 1.1 {
1085 vapier 1.10 register DIR *dir;
1086     register struct dirent *dentry;
1087 vapier 1.14 struct stat st_top, st;
1088 vapier 1.104 char buf[__PAX_UTILS_PATH_MAX];
1089 vapier 1.32 size_t pathlen = 0, len = 0;
1090 vapier 1.10
1091     /* make sure path exists */
1092 vapier 1.39 if (lstat(path, &st_top) == -1) {
1093     if (be_verbose > 2) printf("%s: does not exist\n", path);
1094 vapier 1.10 return;
1095 vapier 1.39 }
1096 solar 1.11
1097 vapier 1.10 /* ok, if it isn't a directory, assume we can open it */
1098 vapier 1.14 if (!S_ISDIR(st_top.st_mode)) {
1099 vapier 1.10 scanelf_file(path);
1100     return;
1101     }
1102    
1103     /* now scan the dir looking for fun stuff */
1104     if ((dir = opendir(path)) == NULL) {
1105     warnf("could not opendir %s: %s", path, strerror(errno));
1106     return;
1107     }
1108 vapier 1.15 if (be_verbose) printf("%s: scanning dir\n", path);
1109 solar 1.11
1110 vapier 1.32 pathlen = strlen(path);
1111 vapier 1.10 while ((dentry = readdir(dir))) {
1112     if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
1113     continue;
1114 vapier 1.32 len = (pathlen + 1 + strlen(dentry->d_name) + 1);
1115     if (len >= sizeof(buf)) {
1116 vapier 1.76 warnf("Skipping '%s': len > sizeof(buf); %lu > %lu\n", path,
1117     (unsigned long)len, (unsigned long)sizeof(buf));
1118 vapier 1.32 continue;
1119     }
1120 solar 1.31 sprintf(buf, "%s/%s", path, dentry->d_name);
1121 solar 1.20 if (lstat(buf, &st) != -1) {
1122 vapier 1.10 if (S_ISREG(st.st_mode))
1123 solar 1.20 scanelf_file(buf);
1124 vapier 1.10 else if (dir_recurse && S_ISDIR(st.st_mode)) {
1125 vapier 1.14 if (dir_crossmount || (st_top.st_dev == st.st_dev))
1126 solar 1.20 scanelf_dir(buf);
1127 vapier 1.10 }
1128     }
1129     }
1130     closedir(dir);
1131 solar 1.1 }
1132    
1133 vapier 1.47 static int scanelf_from_file(char *filename)
1134     {
1135 solar 1.45 FILE *fp = NULL;
1136     char *p;
1137 vapier 1.104 char path[__PAX_UTILS_PATH_MAX];
1138 solar 1.45
1139     if (((strcmp(filename, "-")) == 0) && (ttyname(0) == NULL))
1140     fp = stdin;
1141     else if ((fp = fopen(filename, "r")) == NULL)
1142     return 1;
1143    
1144 vapier 1.104 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1145 solar 1.45 if ((p = strchr(path, '\n')) != NULL)
1146     *p = 0;
1147 vapier 1.66 search_path = path;
1148 solar 1.45 scanelf_dir(path);
1149     }
1150     if (fp != stdin)
1151     fclose(fp);
1152     return 0;
1153     }
1154    
1155 vapier 1.48 static void load_ld_so_conf()
1156     {
1157     FILE *fp = NULL;
1158     char *p;
1159 vapier 1.104 char path[__PAX_UTILS_PATH_MAX];
1160 vapier 1.48 int i = 0;
1161    
1162     if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
1163     return;
1164    
1165 vapier 1.104 while ((fgets(path, __PAX_UTILS_PATH_MAX, fp)) != NULL) {
1166 vapier 1.48 if (*path != '/')
1167     continue;
1168    
1169     if ((p = strrchr(path, '\r')) != NULL)
1170     *p = 0;
1171     if ((p = strchr(path, '\n')) != NULL)
1172     *p = 0;
1173    
1174     ldpaths[i++] = xstrdup(path);
1175    
1176     if (i + 1 == sizeof(ldpaths) / sizeof(*ldpaths))
1177     break;
1178     }
1179     ldpaths[i] = NULL;
1180    
1181     fclose(fp);
1182     }
1183    
1184 vapier 1.10 /* scan /etc/ld.so.conf for paths */
1185     static void scanelf_ldpath()
1186     {
1187 vapier 1.17 char scan_l, scan_ul, scan_ull;
1188 vapier 1.48 int i = 0;
1189 vapier 1.10
1190 vapier 1.48 if (!ldpaths[0])
1191     err("Unable to load any paths from ld.so.conf");
1192 vapier 1.10
1193 vapier 1.17 scan_l = scan_ul = scan_ull = 0;
1194    
1195 vapier 1.48 while (ldpaths[i]) {
1196     if (!scan_l && !strcmp(ldpaths[i], "/lib")) scan_l = 1;
1197     if (!scan_ul && !strcmp(ldpaths[i], "/usr/lib")) scan_ul = 1;
1198     if (!scan_ull && !strcmp(ldpaths[i], "/usr/local/lib")) scan_ull = 1;
1199     scanelf_dir(ldpaths[i]);
1200     ++i;
1201     }
1202 vapier 1.10
1203 vapier 1.17 if (!scan_l) scanelf_dir("/lib");
1204     if (!scan_ul) scanelf_dir("/usr/lib");
1205     if (!scan_ull) scanelf_dir("/usr/local/lib");
1206 vapier 1.10 }
1207 solar 1.1
1208 vapier 1.10 /* scan env PATH for paths */
1209     static void scanelf_envpath()
1210 solar 1.1 {
1211 solar 1.34 char *path, *p;
1212 vapier 1.10
1213     path = getenv("PATH");
1214     if (!path)
1215     err("PATH is not set in your env !");
1216 vapier 1.41 path = xstrdup(path);
1217 vapier 1.10
1218     while ((p = strrchr(path, ':')) != NULL) {
1219     scanelf_dir(p + 1);
1220     *p = 0;
1221     }
1222 vapier 1.17
1223 solar 1.34 free(path);
1224 solar 1.1 }
1225    
1226    
1227 vapier 1.10 /* usage / invocation handling functions */
1228 vapier 1.105 #define PARSE_FLAGS "plRmyAXxetrnLibSs:gN:TaqvF:f:o:BhV"
1229 vapier 1.27 #define a_argument required_argument
1230 vapier 1.10 static struct option const long_opts[] = {
1231     {"path", no_argument, NULL, 'p'},
1232     {"ldpath", no_argument, NULL, 'l'},
1233     {"recursive", no_argument, NULL, 'R'},
1234 vapier 1.14 {"mount", no_argument, NULL, 'm'},
1235 vapier 1.37 {"symlink", no_argument, NULL, 'y'},
1236 vapier 1.105 {"archives", no_argument, NULL, 'A'},
1237     {"ldcache", no_argument, NULL, 'L'},
1238 vapier 1.101 {"fix", no_argument, NULL, 'X'},
1239 vapier 1.10 {"pax", no_argument, NULL, 'x'},
1240 solar 1.16 {"header", no_argument, NULL, 'e'},
1241 vapier 1.10 {"textrel", no_argument, NULL, 't'},
1242     {"rpath", no_argument, NULL, 'r'},
1243 vapier 1.32 {"needed", no_argument, NULL, 'n'},
1244 vapier 1.38 {"interp", no_argument, NULL, 'i'},
1245 vapier 1.49 {"bind", no_argument, NULL, 'b'},
1246 vapier 1.84 {"soname", no_argument, NULL, 'S'},
1247 vapier 1.76 {"symbol", a_argument, NULL, 's'},
1248     {"lib", a_argument, NULL, 'N'},
1249 solar 1.86 {"gmatch", no_argument, NULL, 'g'},
1250 vapier 1.76 {"textrels", no_argument, NULL, 'T'},
1251 vapier 1.10 {"all", no_argument, NULL, 'a'},
1252     {"quiet", no_argument, NULL, 'q'},
1253 vapier 1.14 {"verbose", no_argument, NULL, 'v'},
1254 vapier 1.76 {"format", a_argument, NULL, 'F'},
1255     {"from", a_argument, NULL, 'f'},
1256     {"file", a_argument, NULL, 'o'},
1257 solar 1.16 {"nobanner", no_argument, NULL, 'B'},
1258 vapier 1.10 {"help", no_argument, NULL, 'h'},
1259     {"version", no_argument, NULL, 'V'},
1260     {NULL, no_argument, NULL, 0x0}
1261     };
1262 solar 1.57
1263 solar 1.68 static const char *opts_help[] = {
1264 vapier 1.10 "Scan all directories in PATH environment",
1265     "Scan all directories in /etc/ld.so.conf",
1266 vapier 1.14 "Scan directories recursively",
1267 vapier 1.37 "Don't recursively cross mount points",
1268 vapier 1.101 "Don't scan symlinks",
1269 vapier 1.105 "Scan archives (.a files)",
1270     "Utilize ld.so.cache information (use with -r/-n)",
1271 vapier 1.101 "Try and 'fix' bad things (use with -r/-e)\n",
1272 vapier 1.10 "Print PaX markings",
1273 vapier 1.71 "Print GNU_STACK/PT_LOAD markings",
1274 vapier 1.10 "Print TEXTREL information",
1275     "Print RPATH information",
1276 vapier 1.32 "Print NEEDED information",
1277 vapier 1.38 "Print INTERP information",
1278 vapier 1.49 "Print BIND information",
1279 vapier 1.84 "Print SONAME information",
1280 vapier 1.27 "Find a specified symbol",
1281 vapier 1.72 "Find a specified library",
1282 solar 1.86 "Use strncmp to match libraries. (use with -N)",
1283 vapier 1.76 "Locate cause of TEXTREL",
1284 vapier 1.82 "Print all scanned info (-x -e -t -r -b)\n",
1285 vapier 1.14 "Only output 'bad' things",
1286     "Be verbose (can be specified more than once)",
1287 vapier 1.39 "Use specified format for output",
1288 solar 1.45 "Read input stream from a filename",
1289 vapier 1.24 "Write output stream to a filename",
1290 vapier 1.14 "Don't display the header",
1291 vapier 1.10 "Print this help and exit",
1292     "Print version and exit",
1293     NULL
1294     };
1295    
1296     /* display usage and exit */
1297     static void usage(int status)
1298 solar 1.1 {
1299 vapier 1.44 unsigned long i;
1300 solar 1.52 printf("* Scan ELF binaries for stuff\n\n"
1301 vapier 1.105 "Usage: %s [options] <dir1/file1> [dir2 dirN file2 fileN ...]\n\n", argv0);
1302 solar 1.35 printf("Options: -[%s]\n", PARSE_FLAGS);
1303 vapier 1.10 for (i = 0; long_opts[i].name; ++i)
1304 vapier 1.27 if (long_opts[i].has_arg == no_argument)
1305 solar 1.52 printf(" -%c, --%-13s* %s\n", long_opts[i].val,
1306 vapier 1.27 long_opts[i].name, opts_help[i]);
1307     else
1308 solar 1.52 printf(" -%c, --%-6s <arg> * %s\n", long_opts[i].val,
1309 vapier 1.27 long_opts[i].name, opts_help[i]);
1310 solar 1.45
1311     if (status != EXIT_SUCCESS)
1312     exit(status);
1313    
1314 vapier 1.46 puts("\nThe format modifiers for the -F option are:");
1315 vapier 1.70 puts(" F Filename \tx PaX Flags \te STACK/RELRO");
1316     puts(" t TEXTREL \tr RPATH \tn NEEDED");
1317     puts(" i INTERP \tb BIND \ts symbol");
1318 vapier 1.76 puts(" N library \to Type \tT TEXTRELs");
1319 vapier 1.88 puts(" S SONAME");
1320 vapier 1.70 puts(" p filename (with search path removed)");
1321 vapier 1.88 puts(" f filename (short name/basename)");
1322 vapier 1.70 puts("Prefix each modifier with '%' (verbose) or '#' (silent)");
1323 solar 1.45
1324 vapier 1.10 exit(status);
1325 solar 1.1 }
1326    
1327     /* parse command line arguments and preform needed actions */
1328 vapier 1.10 static void parseargs(int argc, char *argv[])
1329     {
1330 vapier 1.48 int i;
1331 solar 1.45 char *from_file = NULL;
1332 vapier 1.10
1333     opterr = 0;
1334 vapier 1.48 while ((i=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
1335     switch (i) {
1336 vapier 1.10
1337 vapier 1.39 case 'V':
1338 vapier 1.80 printf("pax-utils-%s: %s compiled %s\n%s\n"
1339     "%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
1340     VERSION, __FILE__, __DATE__, rcsid, argv0);
1341 vapier 1.10 exit(EXIT_SUCCESS);
1342     break;
1343     case 'h': usage(EXIT_SUCCESS); break;
1344 solar 1.45 case 'f':
1345 vapier 1.100 if (from_file) warn("You prob don't want to specify -f twice");
1346     from_file = optarg;
1347 solar 1.45 break;
1348 vapier 1.24 case 'o': {
1349 solar 1.21 FILE *fp = NULL;
1350 solar 1.64 if ((fp = freopen(optarg, "w", stdout)) == NULL)
1351 vapier 1.24 err("Could not open output stream '%s': %s", optarg, strerror(errno));
1352 vapier 1.65 SET_STDOUT(fp);
1353 solar 1.21 break;
1354     }
1355 vapier 1.24
1356 vapier 1.39 case 's': {
1357 vapier 1.93 if (find_sym) warn("You prob don't want to specify -s twice");
1358     find_sym = optarg;
1359     versioned_symname = (char*)xmalloc(sizeof(char) * (strlen(find_sym)+1+1));
1360 vapier 1.39 sprintf(versioned_symname, "%s@", find_sym);
1361     break;
1362     }
1363 vapier 1.72 case 'N': {
1364 vapier 1.93 if (find_lib) warn("You prob don't want to specify -N twice");
1365     find_lib = optarg;
1366 vapier 1.72 break;
1367     }
1368 vapier 1.39
1369     case 'F': {
1370 vapier 1.93 if (out_format) warn("You prob don't want to specify -F twice");
1371     out_format = optarg;
1372 vapier 1.39 break;
1373     }
1374 vapier 1.27
1375 solar 1.96 case 'g': gmatch = 1; /* break; any reason we dont breal; here ? */
1376 vapier 1.102 case 'L': use_ldcache = 1; break;
1377 vapier 1.37 case 'y': scan_symlink = 0; break;
1378 vapier 1.105 case 'A': scan_archives = 1; break;
1379 solar 1.16 case 'B': show_banner = 0; break;
1380 vapier 1.10 case 'l': scan_ldpath = 1; break;
1381     case 'p': scan_envpath = 1; break;
1382     case 'R': dir_recurse = 1; break;
1383 vapier 1.14 case 'm': dir_crossmount = 0; break;
1384 vapier 1.101 case 'X': ++fix_elf; break;
1385 vapier 1.10 case 'x': show_pax = 1; break;
1386 solar 1.73 case 'e': show_phdr = 1; break;
1387 vapier 1.10 case 't': show_textrel = 1; break;
1388     case 'r': show_rpath = 1; break;
1389 vapier 1.32 case 'n': show_needed = 1; break;
1390 vapier 1.38 case 'i': show_interp = 1; break;
1391 vapier 1.49 case 'b': show_bind = 1; break;
1392 vapier 1.84 case 'S': show_soname = 1; break;
1393 vapier 1.76 case 'T': show_textrels = 1; break;
1394 vapier 1.10 case 'q': be_quiet = 1; break;
1395 vapier 1.14 case 'v': be_verbose = (be_verbose % 20) + 1; break;
1396 vapier 1.82 case 'a': show_pax = show_phdr = show_textrel = show_rpath = show_bind = 1; break;
1397 vapier 1.10
1398     case ':':
1399 vapier 1.49 err("Option missing parameter\n");
1400 vapier 1.10 case '?':
1401 vapier 1.49 err("Unknown option\n");
1402 vapier 1.10 default:
1403 vapier 1.48 err("Unhandled option '%c'", i);
1404 vapier 1.10 }
1405     }
1406    
1407 vapier 1.39 /* let the format option override all other options */
1408     if (out_format) {
1409 solar 1.73 show_pax = show_phdr = show_textrel = show_rpath = \
1410 vapier 1.84 show_needed = show_interp = show_bind = show_soname = \
1411     show_textrels = 0;
1412 vapier 1.48 for (i = 0; out_format[i]; ++i) {
1413 vapier 1.70 if (!IS_MODIFIER(out_format[i])) continue;
1414 vapier 1.39
1415 vapier 1.48 switch (out_format[++i]) {
1416 vapier 1.39 case '%': break;
1417 vapier 1.70 case '#': break;
1418 vapier 1.39 case 'F': break;
1419 vapier 1.66 case 'p': break;
1420     case 'f': break;
1421 vapier 1.39 case 's': break;
1422 vapier 1.72 case 'N': break;
1423 vapier 1.41 case 'o': break;
1424 vapier 1.39 case 'x': show_pax = 1; break;
1425 solar 1.73 case 'e': show_phdr = 1; break;
1426 vapier 1.39 case 't': show_textrel = 1; break;
1427     case 'r': show_rpath = 1; break;
1428     case 'n': show_needed = 1; break;
1429     case 'i': show_interp = 1; break;
1430 vapier 1.49 case 'b': show_bind = 1; break;
1431 vapier 1.84 case 'S': show_soname = 1; break;
1432 vapier 1.76 case 'T': show_textrels = 1; break;
1433 vapier 1.39 default:
1434     err("Invalid format specifier '%c' (byte %i)",
1435 vapier 1.48 out_format[i], i+1);
1436 vapier 1.39 }
1437     }
1438 vapier 1.41
1439     /* construct our default format */
1440     } else {
1441     size_t fmt_len = 30;
1442     out_format = (char*)xmalloc(sizeof(char) * fmt_len);
1443 vapier 1.76 if (!be_quiet) xstrcat(&out_format, "%o ", &fmt_len);
1444     if (show_pax) xstrcat(&out_format, "%x ", &fmt_len);
1445     if (show_phdr) xstrcat(&out_format, "%e ", &fmt_len);
1446     if (show_textrel) xstrcat(&out_format, "%t ", &fmt_len);
1447     if (show_rpath) xstrcat(&out_format, "%r ", &fmt_len);
1448     if (show_needed) xstrcat(&out_format, "%n ", &fmt_len);
1449     if (show_interp) xstrcat(&out_format, "%i ", &fmt_len);
1450     if (show_bind) xstrcat(&out_format, "%b ", &fmt_len);
1451 vapier 1.84 if (show_soname) xstrcat(&out_format, "%S ", &fmt_len);
1452 vapier 1.76 if (show_textrels) xstrcat(&out_format, "%T ", &fmt_len);
1453     if (find_sym) xstrcat(&out_format, "%s ", &fmt_len);
1454     if (find_lib) xstrcat(&out_format, "%N ", &fmt_len);
1455     if (!be_quiet) xstrcat(&out_format, "%F ", &fmt_len);
1456 vapier 1.39 }
1457 vapier 1.41 if (be_verbose > 2) printf("Format: %s\n", out_format);
1458 vapier 1.39
1459     /* now lets actually do the scanning */
1460 vapier 1.102 if (scan_ldpath || use_ldcache)
1461 vapier 1.48 load_ld_so_conf();
1462 vapier 1.10 if (scan_ldpath) scanelf_ldpath();
1463     if (scan_envpath) scanelf_envpath();
1464 solar 1.45 if (from_file) {
1465     scanelf_from_file(from_file);
1466     from_file = *argv;
1467     }
1468     if (optind == argc && !scan_ldpath && !scan_envpath && !from_file)
1469 vapier 1.25 err("Nothing to scan !?");
1470 vapier 1.66 while (optind < argc) {
1471     search_path = argv[optind++];
1472     scanelf_dir(search_path);
1473     }
1474 vapier 1.27
1475 vapier 1.39 /* clean up */
1476 vapier 1.93 if (versioned_symname) free(versioned_symname);
1477 vapier 1.48 for (i = 0; ldpaths[i]; ++i)
1478     free(ldpaths[i]);
1479 solar 1.96
1480     if (ldcache != 0)
1481     munmap(ldcache, ldcache_size);
1482 vapier 1.10 }
1483    
1484    
1485    
1486 vapier 1.41 /* utility funcs */
1487 vapier 1.60 static char *xstrdup(const char *s)
1488 vapier 1.41 {
1489     char *ret = strdup(s);
1490     if (!ret) err("Could not strdup(): %s", strerror(errno));
1491     return ret;
1492     }
1493     static void *xmalloc(size_t size)
1494     {
1495     void *ret = malloc(size);
1496     if (!ret) err("Could not malloc() %li bytes", (unsigned long)size);
1497     return ret;
1498     }
1499 vapier 1.95 static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n)
1500 vapier 1.41 {
1501 vapier 1.69 size_t new_len;
1502 vapier 1.41
1503     new_len = strlen(*dst) + strlen(src);
1504     if (*curr_len <= new_len) {
1505     *curr_len = new_len + (*curr_len / 2);
1506     *dst = realloc(*dst, *curr_len);
1507     if (!*dst)
1508 vapier 1.95 err("could not realloc() %li bytes", (unsigned long)*curr_len);
1509 vapier 1.41 }
1510    
1511 vapier 1.95 if (n)
1512     strncat(*dst, src, n);
1513     else
1514     strcat(*dst, src);
1515 vapier 1.41 }
1516     static inline void xchrcat(char **dst, const char append, size_t *curr_len)
1517     {
1518     static char my_app[2];
1519     my_app[0] = append;
1520     my_app[1] = '\0';
1521     xstrcat(dst, my_app, curr_len);
1522     }
1523    
1524    
1525 vapier 1.72
1526 vapier 1.10 int main(int argc, char *argv[])
1527 solar 1.1 {
1528 vapier 1.10 if (argc < 2)
1529     usage(EXIT_FAILURE);
1530     parseargs(argc, argv);
1531 solar 1.21 fclose(stdout);
1532 solar 1.61 #ifdef __BOUNDS_CHECKING_ON
1533 vapier 1.66 warn("The calls to add/delete heap should be off by 1 due to the out_buffer not being freed in scanelf_file()");
1534 solar 1.61 #endif
1535 vapier 1.10 return EXIT_SUCCESS;
1536 solar 1.1 }

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