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      1 /*
      2  * Copyright (c) 2001-2018 The strace developers.
      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  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. The name of the author may not be used to endorse or promote products
     14  *    derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "defs.h"
     29 #include <net/if.h>
     30 
     31 #ifdef HAVE_IF_INDEXTONAME
     32 # include "xstring.h"
     33 
     34 # define INI_PFX "if_nametoindex(\""
     35 # define INI_SFX "\")"
     36 # define IFNAME_QUOTED_SZ (sizeof(IFNAMSIZ) * 4 + 3)
     37 
     38 const char *
     39 get_ifname(const unsigned int ifindex)
     40 {
     41 	static char name_quoted_buf[IFNAME_QUOTED_SZ];
     42 	char name_buf[IFNAMSIZ];
     43 
     44 	if (!if_indextoname(ifindex, name_buf))
     45 		return NULL;
     46 
     47 	if (string_quote(name_buf, name_quoted_buf, sizeof(name_buf),
     48 			 QUOTE_0_TERMINATED | QUOTE_OMIT_LEADING_TRAILING_QUOTES,
     49 			 NULL))
     50 		return NULL;
     51 
     52 	return name_quoted_buf;
     53 }
     54 
     55 static const char *
     56 sprint_ifname(const unsigned int ifindex)
     57 {
     58 	static char res[IFNAME_QUOTED_SZ + sizeof(INI_PFX INI_SFX)];
     59 
     60 	const char *name_quoted = get_ifname(ifindex);
     61 
     62 	if (!name_quoted)
     63 		return NULL;
     64 
     65 	xsprintf(res, INI_PFX "%s" INI_SFX, name_quoted);
     66 
     67 	return res;
     68 }
     69 
     70 #else /* !HAVE_IF_INDEXTONAME */
     71 
     72 const char *get_ifname(const unsigned int ifindex) { return NULL; }
     73 
     74 #endif /* HAVE_IF_INDEXTONAME */
     75 
     76 void
     77 print_ifindex(const unsigned int ifindex)
     78 {
     79 #ifdef HAVE_IF_INDEXTONAME
     80 	print_xlat_ex(ifindex, sprint_ifname(ifindex), XLAT_STYLE_FMT_U);
     81 #else
     82 	tprintf("%u", ifindex);
     83 #endif
     84 }
     85