Subversion Repositories or1k

char *readsonameXX(char *name, FILE *infile, int expected_type, int *type)

{

  ElfW(Ehdr) *epnt;

  ElfW(Phdr) *ppnt;

  int i, j;

  char *header;

  ElfW(Word) dynamic_addr = 0;

  ElfW(Word) dynamic_size = 0;

  unsigned long page_size = getpagesize();

  ElfW(Word) strtab_val = 0;

  ElfW(Word) needed_val;

  ElfW(Sword) loadaddr = -1;

  ElfW(Dyn) *dpnt;

  struct stat st;

  char *needed;

  char *soname = NULL;

  int multi_libcs = 0;

  if(expected_type == LIB_DLL)

    {

      warn("%s does not match type specified for directory!", name);

      expected_type = LIB_ANY;

    }

  *type = LIB_ELF;

  if (fstat(fileno(infile), &st))

    return NULL;

  header = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fileno(infile), 0);

  if (header == (caddr_t)-1)

    return NULL;

  epnt = (ElfW(Ehdr) *)header;

  if ((char *)(epnt+1) > (char *)(header + st.st_size))

    goto skip;

  ppnt = (ElfW(Phdr) *)&header[epnt->e_phoff];

  if ((char *)ppnt < (char *)header ||

      (char *)(ppnt+epnt->e_phnum) > (char *)(header + st.st_size))

    goto skip;

  for(i = 0; i < epnt->e_phnum; i++)

  {

    if (loadaddr == -1 && ppnt->p_type == PT_LOAD)

      loadaddr = (ppnt->p_vaddr & ~(page_size-1)) -

        (ppnt->p_offset & ~(page_size-1));

    if(ppnt->p_type == 2)

    {

      dynamic_addr = ppnt->p_offset;

      dynamic_size = ppnt->p_filesz;

    };

    ppnt++;

  };

  dpnt = (ElfW(Dyn) *) &header[dynamic_addr];

  dynamic_size = dynamic_size / sizeof(ElfW(Dyn));

  if ((char *)dpnt < (char *)header ||

      (char *)(dpnt+dynamic_size) > (char *)(header + st.st_size))

    goto skip;

  while (dpnt->d_tag != DT_NULL)

  {

    if (dpnt->d_tag == DT_STRTAB)

      strtab_val = dpnt->d_un.d_val;

    dpnt++;

  };

  if (!strtab_val)

    goto skip;

  dpnt = (ElfW(Dyn) *) &header[dynamic_addr];

  while (dpnt->d_tag != DT_NULL)

  {

    if (dpnt->d_tag == DT_SONAME || dpnt->d_tag == DT_NEEDED)

    {

      needed_val = dpnt->d_un.d_val;

      if (needed_val + strtab_val - loadaddr >= 0 ||

          needed_val + strtab_val - loadaddr < st.st_size)

      {

        needed = (char *) (header - loadaddr + strtab_val + needed_val);

        if (dpnt->d_tag == DT_SONAME)

          soname = xstrdup(needed);

        for (j = 0; needed_tab[j].soname != NULL; j++)

        {

          if (strcmp(needed, needed_tab[j].soname) == 0)

          {

            if (*type != LIB_ELF && *type != needed_tab[j].type)

              multi_libcs = 1;

            *type = needed_tab[j].type;

          }

        }

      }

    }

    dpnt++;

  };

  if (multi_libcs)

    warn("%s appears to be for multiple libc's", name);

  /* If we could not deduce the libc type, and we know what to expect, set the type */

  if(*type == LIB_ELF && expected_type != LIB_ANY) *type = expected_type;

  if(expected_type != LIB_ANY && expected_type != LIB_ELF &&

     expected_type != *type)

  {

      warn("%s does not match type specified for directory!", name);

  }

 skip:

  munmap(header, st.st_size);

  return soname;

}