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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/*
Copyright (C) 2001-2025 Free Software Foundation, Inc.
This file is part of GNU Inetutils.
GNU Inetutils is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Inetutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see `http://www.gnu.org/licenses/'. */
#include <config.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
/* Solaris at least earlier 2.6 and before does not include
the ioctl definitions if BSD_COMP is not set. */
#if defined __svr4__
# define BSD_COMP 1
#endif
#include <sys/ioctl.h>
#include <net/if.h>
#ifndef HAVE_STRUCT_IF_NAMEINDEX
unsigned int
if_nametoindex (const char *ifname)
{
int result = 0;
# ifdef SIOCGIFINDEX
{
int fd = socket (AF_INET, SOCK_DGRAM, 0);
if (fd >= 0)
{
int rc;
struct ifreq ifr;
strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
ifr.ifr_name[IFNAMSIZ - 1] = '\0';
rc = ioctl (fd, SIOCGIFINDEX, &ifr);
close (fd);
if (rc == 0)
return ifr.ifr_index;
}
}
# endif
{
struct if_nameindex *idx;
idx = if_nameindex ();
if (idx != NULL)
{
struct if_nameindex *p;
for (p = idx; p->if_index || p->if_name; ++p)
{
if (strncmp (p->if_name, ifname, IFNAMSIZ) == 0)
{
result = p->if_index;
break;
}
}
if_freenameindex (idx);
}
return result;
}
}
void
if_freenameindex (struct if_nameindex *ifn)
{
struct if_nameindex *ptr = ifn;
if (!ifn)
return;
while (ptr->if_name || ptr->if_index)
{
free (ptr->if_name);
++ptr;
}
free (ifn);
}
struct if_nameindex *
if_nameindex (void)
{
# if defined SIOCGIFCONF
int fd = socket (AF_INET, SOCK_DGRAM, 0);
struct ifconf ifc;
unsigned int i = 0;
int rq_len, last_len;
struct if_nameindex *idx = NULL;
struct ifreq *ifr, *end, *cur;
if (fd < 0)
return NULL;
/* A first estimate. */
rq_len = 4 * sizeof (struct ifreq);
ifc.ifc_buf = NULL;
ifc.ifc_len = 0;
/* Read all the interfaces out of the kernel. */
do
{
last_len = ifc.ifc_len;
ifc.ifc_buf = alloca (ifc.ifc_len = rq_len);
if (ifc.ifc_buf == NULL || ioctl (fd, SIOCGIFCONF, &ifc) < 0)
{
close (fd);
return NULL;
}
rq_len *= 2;
}
while (ifc.ifc_len != last_len);
i = 0;
ifr = (struct ifreq *) ifc.ifc_req;
end = (struct ifreq *) (ifr + ifc.ifc_len);
while (ifr < end)
{
cur = ifr;
++ifr;
/* We ignore the other families .. OK ? */
if (cur->ifr_addr.sa_family != AF_INET)
continue;
/* Make Room safely. */
{
struct if_nameindex *tidx = NULL;
tidx = realloc (idx, (i + 1) * sizeof (*idx));
if (tidx == NULL)
{
if_freenameindex (idx);
close (fd);
errno = ENOBUFS;
return NULL;
}
idx = tidx;
}
/* FIXME: We did not deal with duplicates or interface aliases. */
idx[i].if_name = strdup (cur->ifr_name);
if (idx[i].if_name == NULL)
{
if_freenameindex (idx);
close (fd);
errno = ENOBUFS;
return NULL;
}
# if defined SIOCGIFINDEX
if (ioctl (fd, SIOCGIFINDEX, cur) >= 0)
idx[i].if_index = cur->ifr_index;
else
# endif
idx[i].if_index = i + 1;
i++;
}
/* Terminate the array with an empty solt. */
{
struct if_nameindex *tidx = NULL;
tidx = realloc (idx, (i + 1) * sizeof (*idx));
if (tidx == NULL)
{
if_freenameindex (idx);
close (fd);
errno = ENOBUFS;
return NULL;
}
idx = tidx;
}
idx[i].if_index = 0;
idx[i].if_name = NULL;
close (fd);
return idx;
# else
errno = ENOSYS;
return NULL;
# endif
}
#endif
|
