lib/ip/getifaddrs.c

   1 #include <errno.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <fcntl.h>
   6 #include <ifaddrs.h>
   7 #include <sys/ioctl.h>
   8 #include <sys/socket.h>
   9 #include <sys/types.h>
  10 #include <netinet/in.h>
  11
  12 #include <net/gen/in.h>
  13 #include <net/gen/ip_io.h>
  14 #include <net/gen/tcp.h>
  15 #include <net/gen/tcp_io.h>
  16 #include <net/gen/udp.h>
  17 #include <net/gen/udp_io.h>
  18
  19 int
  20 getifaddrs(struct ifaddrs **ifap)
  21 {
  22         static int fd = -1;
  23         nwio_ipconf_t ipconf;
  24         int flags, err, r;
  25         static struct ifaddrs ifa;
  26         static struct sockaddr_in addr, netmask;
  27
  28         memset(&ifa, 0, sizeof(ifa));
  29         memset(&addr, 0, sizeof(addr));
  30         memset(&netmask, 0, sizeof(netmask));
  31         ifa.ifa_next = NULL;
  32         ifa.ifa_name = "ip";
  33         addr.sin_family = netmask.sin_family = AF_INET;
  34         ifa.ifa_addr = (struct sockaddr *) &addr;
  35         ifa.ifa_netmask = (struct sockaddr *) &netmask;
  36         addr.sin_addr.s_addr = 0;
  37         netmask.sin_addr.s_addr = 0;
  38
  39         if(fd < 0) {
  40                 char *ipd;
  41                 if(!(ipd=getenv("IP_DEVICE")))
  42                         ipd="/dev/ip";
  43                 if((fd = open(ipd, O_RDWR)) < 0)
  44                         return -1;
  45         }
  46
  47         /* Code taken from commands/simple/ifconfig.c. */
  48
  49         if((flags = fcntl(fd, F_GETFL)) < 0 ||
  50            fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0 ||
  51            ioctl(fd, NWIOGIPCONF, &ipconf))
  52                 return 0;       /* Report interface as down. */
  53
  54         addr.sin_addr.s_addr = ipconf.nwic_ipaddr;
  55         netmask.sin_addr.s_addr = ipconf.nwic_netmask;
  56         if(addr.sin_addr.s_addr) ifa.ifa_flags = IFF_UP;
  57
  58         /* Just report on this interface. */
  59
  60         *ifap = &ifa;
  61
  62         return 0;
  63 }
  64
  65 void
  66 freeifaddrs(struct ifaddrs *ifp)
  67 {
  68         /* getifaddrs points to static data, so no need to free. */
  69         ;
  70 }
  71