lib/libc/ip/getifaddrs.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <fcntl.h>
   5 #include <ifaddrs.h>
   6 #include <sys/ioctl.h>
   7 #include <sys/socket.h>
   8 #include <sys/types.h>
   9 #include <netinet/in.h>
  10
  11 #include <net/gen/in.h>
  12 #include <net/gen/ip_io.h>
  13 #include <net/gen/tcp.h>
  14 #include <net/gen/udp.h>
  15
  16 int
  17 getifaddrs(struct ifaddrs **ifap)
  18 {
  19         static int fd = -1;
  20         nwio_ipconf_t ipconf;
  21         int flags;
  22         static struct ifaddrs ifa;
  23         static struct sockaddr_in addr, netmask;
  24
  25         memset(&ifa, 0, sizeof(ifa));
  26         memset(&addr, 0, sizeof(addr));
  27         memset(&netmask, 0, sizeof(netmask));
  28         ifa.ifa_next = NULL;
  29         ifa.ifa_name = "ip";
  30         addr.sin_family = netmask.sin_family = AF_INET;
  31         ifa.ifa_addr = (struct sockaddr *) &addr;
  32         ifa.ifa_netmask = (struct sockaddr *) &netmask;
  33         addr.sin_addr.s_addr = 0;
  34         netmask.sin_addr.s_addr = 0;
  35
  36         if(fd < 0) {
  37                 char *ipd;
  38                 if(!(ipd=getenv("IP_DEVICE")))
  39                         ipd="/dev/ip";
  40                 if((fd = open(ipd, O_RDWR)) < 0)
  41                         return -1;
  42         }
  43
  44         /* Code taken from commands/simple/ifconfig.c. */
  45
  46         if((flags = fcntl(fd, F_GETFL)) < 0 ||
  47            fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0 ||
  48            ioctl(fd, NWIOGIPCONF, &ipconf))
  49                 return 0;       /* Report interface as down. */
  50
  51         addr.sin_addr.s_addr = ipconf.nwic_ipaddr;
  52         netmask.sin_addr.s_addr = ipconf.nwic_netmask;
  53         if(addr.sin_addr.s_addr) ifa.ifa_flags = IFF_UP;
  54
  55         /* Just report on this interface. */
  56
  57         *ifap = &ifa;
  58
  59         return 0;
  60 }
  61
  62 void
  63 freeifaddrs(struct ifaddrs *ifp)
  64 {
  65         /* getifaddrs points to static data, so no need to free. */
  66         ;
  67 }
  68