getifname.c revision 145519 
1/*	$FreeBSD: head/contrib/ipfilter/lib/getifname.c 145519 2005-04-25 18:20:15Z darrenr $	*/
2
3#include "ipf.h"
4
5#include "kmem.h"
6
7/*
8 * Given a pointer to an interface in the kernel, return a pointer to a
9 * string which is the interface name.
10 */
11char *getifname(ptr)
12struct ifnet *ptr;
13{
14#if SOLARIS || defined(__hpux)
15# if SOLARIS
16#  include <sys/mutex.h>
17#  include <sys/condvar.h>
18# endif
19# ifdef __hpux
20#  include "compat.h"
21# endif
22# include "../pfil/qif.h"
23	char *ifname;
24	qif_t qif;
25
26	if ((void *)ptr == (void *)-1)
27		return "!";
28	if (ptr == NULL)
29		return "-";
30
31	if (kmemcpy((char *)&qif, (u_long)ptr, sizeof(qif)) == -1)
32		return "X";
33	ifname = strdup(qif.qf_name);
34	if ((ifname != NULL) && (*ifname == '\0')) {
35		free(ifname);
36		return "!";
37	}
38	return ifname;
39#else
40# if defined(NetBSD) && (NetBSD >= 199905) && (NetBSD < 1991011) || \
41    defined(__OpenBSD__) || \
42    (defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
43#else
44	char buf[32];
45	int len;
46# endif
47	struct ifnet netif;
48
49	if ((void *)ptr == (void *)-1)
50		return "!";
51	if (ptr == NULL)
52		return "-";
53
54	if (kmemcpy((char *)&netif, (u_long)ptr, sizeof(netif)) == -1)
55		return "X";
56# if defined(NetBSD) && (NetBSD >= 199905) && (NetBSD < 1991011) || \
57    defined(__OpenBSD__) || defined(linux) || \
58    (defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
59	return strdup(netif.if_xname);
60# else
61	if (kstrncpy(buf, (u_long)netif.if_name, sizeof(buf)) == -1)
62		return "X";
63	if (netif.if_unit < 10)
64		len = 2;
65	else if (netif.if_unit < 1000)
66		len = 3;
67	else if (netif.if_unit < 10000)
68		len = 4;
69	else
70		len = 5;
71	buf[sizeof(buf) - len] = '\0';
72	sprintf(buf + strlen(buf), "%d", netif.if_unit % 10000);
73	return strdup(buf);
74# endif
75#endif
76}
77