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       1                 :            : /* Find the debuginfo file for a module from its build ID.
       2                 :            :    Copyright (C) 2007, 2009 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            : 
       5                 :            :    This file is free software; you can redistribute it and/or modify
       6                 :            :    it under the terms of either
       7                 :            : 
       8                 :            :      * the GNU Lesser General Public License as published by the Free
       9                 :            :        Software Foundation; either version 3 of the License, or (at
      10                 :            :        your option) any later version
      11                 :            : 
      12                 :            :    or
      13                 :            : 
      14                 :            :      * the GNU General Public License as published by the Free
      15                 :            :        Software Foundation; either version 2 of the License, or (at
      16                 :            :        your option) any later version
      17                 :            : 
      18                 :            :    or both in parallel, as here.
      19                 :            : 
      20                 :            :    elfutils is distributed in the hope that it will be useful, but
      21                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23                 :            :    General Public License for more details.
      24                 :            : 
      25                 :            :    You should have received copies of the GNU General Public License and
      26                 :            :    the GNU Lesser General Public License along with this program.  If
      27                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      28                 :            : 
      29                 :            : #include "libdwflP.h"
      30                 :            : #include <unistd.h>
      31                 :            : 
      32                 :            : 
      33                 :            : int
      34                 :         45 : dwfl_build_id_find_debuginfo (Dwfl_Module *mod,
      35                 :            :                               void **userdata __attribute__ ((unused)),
      36                 :            :                               const char *modname __attribute__ ((unused)),
      37                 :            :                               Dwarf_Addr base __attribute__ ((unused)),
      38                 :            :                               const char *file __attribute__ ((unused)),
      39                 :            :                               const char *debuglink __attribute__ ((unused)),
      40                 :            :                               GElf_Word crc __attribute__ ((unused)),
      41                 :            :                               char **debuginfo_file_name)
      42                 :            : {
      43                 :         45 :   int fd = -1;
      44                 :            :   const unsigned char *bits;
      45                 :            :   GElf_Addr vaddr;
      46         [ +  - ]:         45 :   if (INTUSE(dwfl_module_build_id) (mod, &bits, &vaddr) > 0)
      47                 :         45 :     fd = __libdwfl_open_by_build_id (mod, true, debuginfo_file_name);
      48         [ +  + ]:         45 :   if (fd >= 0)
      49                 :            :     {
      50                 :            :       /* We need to open an Elf handle on the file so we can check its
      51                 :            :          build ID note for validation.  Backdoor the handle into the
      52                 :            :          module data structure since we had to open it early anyway.  */
      53                 :          9 :       Dwfl_Error error = __libdw_open_file (&fd, &mod->debug.elf, true, false);
      54         [ -  + ]:          9 :       if (error != DWFL_E_NOERROR)
      55                 :          0 :         __libdwfl_seterrno (error);
      56         [ +  - ]:          9 :       else if (likely (__libdwfl_find_build_id (mod, false,
      57                 :            :                                                 mod->debug.elf) == 2))
      58                 :            :         {
      59                 :            :           /* Also backdoor the gratuitous flag.  */
      60                 :          9 :           mod->debug.valid = true;
      61                 :          9 :           return fd;
      62                 :            :         }
      63                 :            :       else
      64                 :            :         {
      65                 :            :           /* A mismatch!  */
      66                 :          0 :           elf_end (mod->debug.elf);
      67                 :          0 :           mod->debug.elf = NULL;
      68                 :          0 :           close (fd);
      69                 :          0 :           fd = -1;
      70                 :            :         }
      71                 :          0 :       free (*debuginfo_file_name);
      72                 :          0 :       *debuginfo_file_name = NULL;
      73                 :          0 :       errno = 0;
      74                 :            :     }
      75                 :         45 :   return fd;
      76                 :            : }
      77                 :            : INTDEF (dwfl_build_id_find_debuginfo)