sys/src/libip/myipaddr.c

   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         static Ipifc *ifc;
  26         uchar mynet[IPaddrlen];
  27
  28         ifc = readipifc(net, ifc, -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                                 return 0;
  38                         }
  39                 }
  40         ipmove(ip, IPnoaddr);
  41         return -1;
  42 }