1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/* $OpenBSD: if.c,v 1.13 2003/02/12 15:11:31 markus Exp $ */
/* $EOM: if.c,v 1.12 1999/10/01 13:45:20 niklas Exp $ */
/*
* Copyright (c) 1998, 1999 Niklas Hallqvist. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Ericsson Radio Systems.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef HAVE_GETIFADDRS
#include <ifaddrs.h>
#endif
#include "sysdep.h"
#include "log.h"
#include "if.h"
#ifndef HAVE_GETIFADDRS
/* XXX Unsafe if either x or y has side-effects. */
#ifndef MAX
#define MAX(x, y) ((x) > (y) ? (x) : (y))
#endif
/* Most boxes has less than 16 interfaces, so this might be a good guess. */
#define INITIAL_IFREQ_COUNT 16
/*
* Get all network interface configurations.
* Return 0 if successful, -1 otherwise.
*/
int
siocgifconf (struct ifconf *ifcp)
{
int s;
int len;
caddr_t buf, new_buf;
/* Get a socket to ask for the network interface configurations. */
s = socket (AF_INET, SOCK_DGRAM, 0);
if (s == -1)
{
log_error ("siocgifconf: socket (AF_INET, SOCK_DGRAM, 0) failed");
return -1;
}
len = sizeof (struct ifreq) * INITIAL_IFREQ_COUNT;
buf = 0;
while (1)
{
/*
* Allocate a larger buffer each time around the loop and get the
* network interfaces configurations into it.
*/
ifcp->ifc_len = len;
new_buf = realloc (buf, len);
if (!new_buf)
{
log_error ("siocgifconf: realloc (%p, %d) failed", buf, len);
goto err;
}
ifcp->ifc_buf = buf = new_buf;
if (ioctl (s, SIOCGIFCONF, ifcp) == -1)
{
log_error ("siocgifconf: ioctl (%d, SIOCGIFCONF, ...) failed", s);
goto err;
}
/*
* If there is place for another ifreq we can be sure that the buffer
* was big enough, otherwise double the size and try again.
*/
if (len - ifcp->ifc_len >= sizeof (struct ifreq))
break;
len *= 2;
}
close (s);
return 0;
err:
if (buf)
free (buf);
close (s);
return -1;
}
#endif
int
if_map (int (*func) (char *, struct sockaddr *, void *), void *arg)
{
int err = 0;
#ifdef HAVE_GETIFADDRS
struct ifaddrs *ifap, *ifa;
if (getifaddrs(&ifap) < 0)
return -1;
for (ifa = ifap; ifa; ifa = ifa->ifa_next)
if ((*func) (ifa->ifa_name, ifa->ifa_addr, arg) == -1)
err = -1;
freeifaddrs(ifap);
#else
struct ifconf ifc;
struct ifreq *ifrp;
caddr_t limit, p;
size_t len;
if (siocgifconf (&ifc))
return -1;
limit = ifc.ifc_buf + ifc.ifc_len;
for (p = ifc.ifc_buf; p < limit; p += len)
{
ifrp = (struct ifreq *)p;
if ((*func) (ifrp->ifr_name, &ifrp->ifr_addr, arg) == -1)
err = -1;
len = sizeof ifrp->ifr_name
+ MAX (sysdep_sa_len (&ifrp->ifr_addr), sizeof ifrp->ifr_addr);
}
free (ifc.ifc_buf);
#endif
return err;
}
|
