user/iplib/myipaddr.c

   1 /*
   2  * This file is part of the UCB release of Plan 9. It is subject to the license
   3  * terms in the LICENSE file found in the top-level directory of this
   4  * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
   5  * part of the UCB release of Plan 9, including this file, may be copied,
   6  * modified, propagated, or distributed except according to the terms contained
   7  * in the LICENSE file.
   8  */
   9 #include <stdlib.h>
  10
  11 #include <stdio.h>
  12 #include <parlib.h>
  13 #include <unistd.h>
  14 #include <signal.h>
  15 #include <iplib.h>
  16
  17 static uint8_t loopbacknet[IPaddrlen] = {
  18         0, 0, 0, 0,
  19         0, 0, 0, 0,
  20         0, 0, 0xff, 0xff,
  21         127, 0, 0, 0
  22 };
  23 static uint8_t loopbackmask[IPaddrlen] = {
  24         0xff, 0xff, 0xff, 0xff,
  25         0xff, 0xff, 0xff, 0xff,
  26         0xff, 0xff, 0xff, 0xff,
  27         0xff, 0, 0, 0
  28 };
  29
  30 // find first ip addr that isn't the friggin loopback address
  31 // unless there are no others
  32 int
  33 myipaddr(uint8_t *ip, char *net)
  34 {
  35         struct ipifc *nifc;
  36         struct iplifc *lifc;
  37         static struct ipifc *ifc;
  38         uint8_t mynet[IPaddrlen];
  39
  40         ifc = readipifc(net, ifc, -1);
  41         for(nifc = ifc; nifc; nifc = nifc->next)
  42                 for(lifc = nifc->lifc; lifc; lifc = lifc->next){
  43                         maskip(lifc->ip, loopbackmask, mynet);
  44                         if(ipcmp(mynet, loopbacknet) == 0){
  45                                 continue;
  46                         }
  47                         if(ipcmp(lifc->ip, IPnoaddr) != 0){
  48                                 ipmove(ip, lifc->ip);
  49                                 return 0;
  50                         }
  51                 }
  52         ipmove(ip, IPnoaddr);
  53         return -1;
  54 }