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  1. /*
  2.  * Copyright (c) 2008 Jiri Svoboda
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup rtld rtld
  30.  * @brief
  31.  * @{
  32.  */
  33. /**
  34.  * @file
  35.  */
  36.  
  37. #include <stdio.h>
  38. #include <string.h>
  39.  
  40. #include <elf_dyn.h>
  41. #include <dynamic.h>
  42.  
  43. void dynamic_parse(elf_dyn_t *dyn_ptr, size_t bias, dyn_info_t *info)
  44. {
  45.     elf_dyn_t *dp = dyn_ptr;
  46.  
  47.     void *d_ptr;
  48.     elf_word d_val;
  49.  
  50.     elf_word soname_idx;
  51.     elf_word rpath_idx;
  52.  
  53.     printf("memset\n");
  54.     memset(info, 0, sizeof(info));
  55.  
  56.     soname_idx = 0;
  57.     rpath_idx = 0;
  58.  
  59.     printf("pass 1\n");
  60.     while (dp->d_tag != DT_NULL) {
  61.         d_ptr = (void *)((uint8_t *)dp->d_un.d_ptr + bias);
  62.         d_val = dp->d_un.d_val;
  63.  
  64.         switch (dp->d_tag) {
  65.  
  66.         case DT_PLTRELSZ:   info->plt_rel_sz = d_val; break;
  67.         case DT_PLTGOT:     info->plt_got = d_ptr; break;
  68.         case DT_HASH:       info->hash = d_ptr; break;
  69.         case DT_STRTAB:     info->str_tab = d_ptr; break;
  70.         case DT_SYMTAB:     info->sym_tab = d_ptr; break;
  71.         case DT_RELA:       info->rela = d_ptr; break;
  72.         case DT_RELASZ:     info->rela_sz = d_val; break;
  73.         case DT_RELAENT:    info->rela_ent = d_val; break;
  74.         case DT_STRSZ:      info->str_sz = d_val; break;
  75.         case DT_SYMENT:     info->sym_ent = d_val; break;
  76.         case DT_INIT:       info->init = d_ptr; break;
  77.         case DT_FINI:       info->fini = d_ptr; break;
  78.         case DT_SONAME:     soname_idx = d_val; break;
  79.         case DT_RPATH:      rpath_idx = d_val; break;
  80.         case DT_SYMBOLIC:   info->symbolic = true; break;
  81.         case DT_REL:        info->rel = d_ptr; break;
  82.         case DT_RELSZ:      info->rel_sz = d_val; break;
  83.         case DT_RELENT:     info->rel_ent = d_val; break;
  84.         case DT_PLTREL:     info->plt_rel = d_val; break;
  85.         case DT_TEXTREL:    info->text_rel = true; break;
  86.         case DT_JMPREL:     info->jmp_rel = d_ptr; break;
  87.         case DT_BIND_NOW:   info->bind_now = true; break;
  88.  
  89.         default: break;
  90.         }
  91.  
  92.         ++dp;
  93.     }
  94.  
  95.     info->soname = info->str_tab + soname_idx;
  96.     info->rpath = info->str_tab + rpath_idx;
  97.  
  98.     /* This will be useful for parsing dependencies later */
  99.     info->dynamic = dyn_ptr;
  100.  
  101.     printf("str_tab=0x%x, soname_idx=0x%x, soname=0x%x\n",
  102.         (uintptr_t)info->soname, soname_idx, (uintptr_t)info->soname);
  103.     printf("soname='%s'\n", info->soname);
  104.     printf("rpath='%s'\n", info->rpath);
  105.     printf("hash=0x%x\n", (uintptr_t)info->hash);
  106.  
  107.     /*
  108.      * Now that we have a pointer to the string table,
  109.      * we can parse DT_NEEDED fields (which contain offsets into it).
  110.      */
  111.  
  112.     printf("pass 2\n");
  113.     dp = dyn_ptr;
  114.     while (dp->d_tag != DT_NULL) {
  115.         d_val = dp->d_un.d_val;
  116.  
  117.         switch (dp->d_tag) {
  118.         case DT_NEEDED:
  119.             /* Assume just for now there's only one dependency */
  120.             info->needed = info->str_tab + d_val;
  121.             printf("needed:'%s'\n", info->needed);
  122.             break;
  123.  
  124.         default: break;
  125.         }
  126.  
  127.         ++dp;
  128.     }
  129. }
  130.  
  131. /** @}
  132.  */
  133.