tmyipaddr.c - plan9port - [fork] Plan 9 from user space
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tmyipaddr.c (877B)
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1 #include <u.h>
2 #include <libc.h>
3 #include <ip.h>
4
5 static uchar loopbacknet[IPaddrlen] = {
6 0, 0, 0, 0,
7 0, 0, 0, 0,
8 0, 0, 0xff, 0xff,
9 127, 0, 0, 0
10 };
11 static uchar loopbackmask[IPaddrlen] = {
12 0xff, 0xff, 0xff, 0xff,
13 0xff, 0xff, 0xff, 0xff,
14 0xff, 0xff, 0xff, 0xff,
15 0xff, 0, 0, 0
16 };
17
18 /* find first ip addr that isn't the friggin loopback address */
19 /* unless there are no others */
20 int
21 myipaddr(uchar *ip, char *net)
22 {
23 Ipifc *nifc;
24 Iplifc *lifc;
25 Ipifc *ifc;
26 uchar mynet[IPaddrlen];
27
28 ifc = readipifc(net, nil, -1);
29 for(nifc = ifc; nifc; nifc = nifc->next)
30 for(lifc = nifc->lifc; lifc; lifc = lifc->next){
31 maskip(lifc->ip, loopbackmask, mynet);
32 if(ipcmp(mynet, loopbacknet) == 0){
33 continue;
34 }
35 if(ipcmp(lifc->ip, IPnoaddr) != 0){
36 ipmove(ip, lifc->ip);
37 freeipifc(ifc);
38 return 0;
39 }
40 }
41 ipmove(ip, IPnoaddr);
42 freeipifc(ifc);
43 return -1;
44 }