strace/print_ifindex.c
Dmitry V. Levin b93d52fe3d Change the license of strace to LGPL-2.1-or-later
strace is now provided under the terms of the GNU Lesser General
Public License version 2.1 or later, see COPYING for more details.

strace test suite is now provided under the terms of the GNU General
Public License version 2 or later, see tests/COPYING for more details.
2018-12-10 00:00:00 +00:00

65 lines
1.3 KiB
C

/*
* Copyright (c) 2001-2018 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include <net/if.h>
#ifdef HAVE_IF_INDEXTONAME
# include "xstring.h"
# define INI_PFX "if_nametoindex(\""
# define INI_SFX "\")"
# define IFNAME_QUOTED_SZ (sizeof(IFNAMSIZ) * 4 + 3)
const char *
get_ifname(const unsigned int ifindex)
{
static char name_quoted_buf[IFNAME_QUOTED_SZ];
char name_buf[IFNAMSIZ];
if (!if_indextoname(ifindex, name_buf))
return NULL;
if (string_quote(name_buf, name_quoted_buf, sizeof(name_buf),
QUOTE_0_TERMINATED | QUOTE_OMIT_LEADING_TRAILING_QUOTES,
NULL))
return NULL;
return name_quoted_buf;
}
static const char *
sprint_ifname(const unsigned int ifindex)
{
static char res[IFNAME_QUOTED_SZ + sizeof(INI_PFX INI_SFX)];
const char *name_quoted = get_ifname(ifindex);
if (!name_quoted)
return NULL;
xsprintf(res, INI_PFX "%s" INI_SFX, name_quoted);
return res;
}
#else /* !HAVE_IF_INDEXTONAME */
const char *get_ifname(const unsigned int ifindex) { return NULL; }
#endif /* HAVE_IF_INDEXTONAME */
void
print_ifindex(const unsigned int ifindex)
{
#ifdef HAVE_IF_INDEXTONAME
print_xlat_ex(ifindex, sprint_ifname(ifindex), XLAT_STYLE_FMT_U);
#else
tprintf("%u", ifindex);
#endif
}