1  /*
       2   * Copyright (c) 2001-2021 The strace developers.
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: LGPL-2.1-or-later
       6   */
       7  
       8  #include "defs.h"
       9  #include <net/if.h>
      10  
      11  #ifdef HAVE_IF_INDEXTONAME
      12  # include "xstring.h"
      13  
      14  # define INI_PFX "if_nametoindex(\""
      15  # define INI_SFX "\")"
      16  # define IFNAME_QUOTED_SZ (IFNAMSIZ * 4 + 3)
      17  
      18  const char *
      19  get_ifname(const unsigned int ifindex)
      20  {
      21  	static char name_quoted_buf[IFNAME_QUOTED_SZ];
      22  	char name_buf[IFNAMSIZ];
      23  
      24  	if (!if_indextoname(ifindex, name_buf))
      25  		return NULL;
      26  
      27  	if (string_quote(name_buf, name_quoted_buf, sizeof(name_buf),
      28  			 QUOTE_0_TERMINATED | QUOTE_OMIT_LEADING_TRAILING_QUOTES,
      29  			 NULL))
      30  		return NULL;
      31  
      32  	return name_quoted_buf;
      33  }
      34  
      35  static const char *
      36  sprint_ifname(const unsigned int ifindex)
      37  {
      38  	static char res[IFNAME_QUOTED_SZ + sizeof(INI_PFX INI_SFX)];
      39  
      40  	const char *name_quoted = get_ifname(ifindex);
      41  
      42  	if (!name_quoted)
      43  		return NULL;
      44  
      45  	xsprintf(res, INI_PFX "%s" INI_SFX, name_quoted);
      46  
      47  	return res;
      48  }
      49  
      50  #else /* !HAVE_IF_INDEXTONAME */
      51  
      52  const char *get_ifname(const unsigned int ifindex) { return NULL; }
      53  
      54  #endif /* HAVE_IF_INDEXTONAME */
      55  
      56  void
      57  print_ifindex(const unsigned int ifindex)
      58  {
      59  #ifdef HAVE_IF_INDEXTONAME
      60  	print_xlat_ex(ifindex, sprint_ifname(ifindex), XLAT_STYLE_FMT_U);
      61  #else
      62  	PRINT_VAL_U(ifindex);
      63  #endif
      64  }