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
|
#include <u.h>
#include <libc.h>
#include <ip.h>
static uchar loopbacknet[IPaddrlen] = {
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0xff, 0xff,
127, 0, 0, 0
};
static uchar loopbackmask[IPaddrlen] = {
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0, 0, 0
};
static uchar loopback6[IPaddrlen] = {
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 1
};
// find first ip that isn't a friggin loopback or
// link-local address. prefer v4 over v6.
int
myipaddr(uchar *ip, char *net)
{
Ipifc *nifc;
Iplifc *lifc;
static Ipifc *ifc;
uchar mynet[IPaddrlen];
ipmove(ip, IPnoaddr);
ifc = readipifc(net, ifc, -1);
for(nifc = ifc; nifc != nil; nifc = nifc->next){
for(lifc = nifc->lifc; lifc != nil; lifc = lifc->next){
/* unspecified */
if(ipcmp(lifc->ip, IPnoaddr) == 0)
continue;
if(isv4(lifc->ip)){
/* ipv4 loopback */
maskip(lifc->ip, loopbackmask, mynet);
if(ipcmp(mynet, loopbacknet) == 0)
continue;
ipmove(ip, lifc->ip);
return 0;
}
/* already got a v6 address? */
if(ipcmp(ip, IPnoaddr) != 0)
continue;
/* ipv6 loopback */
if(ipcmp(lifc->ip, loopback6) == 0)
continue;
/* ipv6 linklocal */
if(ISIPV6LINKLOCAL(lifc->ip))
continue;
/* save first v6 address */
ipmove(ip, lifc->ip);
}
}
return ipcmp(ip, IPnoaddr) != 0 ? 0 : -1;
}
|
