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 *
get_ifname(const unsigned int ifindex)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 *
sprint_ifname(const unsigned int ifindex)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
get_ifname(const unsigned int ifindex)72 const char *get_ifname(const unsigned int ifindex) { return NULL; }
73
74 #endif /* HAVE_IF_INDEXTONAME */
75
76 void
print_ifindex(const unsigned int ifindex)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