lib/libc/net/minix/getifaddrs.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <fcntl.h>
   5 #include <net/if.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/udp.h>
  16
  17 int
  18 getifaddrs(struct ifaddrs **ifap)
  19 {
  20         static int fd = -1;
  21         nwio_ipconf_t ipconf;
  22         int flags;
  23         static struct ifaddrs ifa;
  24         static struct sockaddr_in addr, netmask;
  25
  26         memset(&ifa, 0, sizeof(ifa));
  27         memset(&addr, 0, sizeof(addr));
  28         memset(&netmask, 0, sizeof(netmask));
  29         ifa.ifa_next = NULL;
  30         ifa.ifa_name = __UNCONST("ip");
  31         addr.sin_family = netmask.sin_family = AF_INET;
  32         ifa.ifa_addr = (struct sockaddr *) &addr;
  33         ifa.ifa_netmask = (struct sockaddr *) &netmask;
  34         addr.sin_addr.s_addr = 0;
  35         netmask.sin_addr.s_addr = 0;
  36
  37         *ifap = NULL;
  38
  39         if(fd < 0) {
  40                 char *ipd;
  41
  42                 if(!(ipd = getenv("IP_DEVICE")))
  43                         ipd = __UNCONST("/dev/ip");
  44                 if((fd = open(ipd, O_RDWR)) < 0)
  45                         return -1;
  46         }
  47
  48         /* Code taken from commands/simple/ifconfig.c. */
  49
  50         if((flags = fcntl(fd, F_GETFL)) < 0 ||
  51            fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0 ||
  52            ioctl(fd, NWIOGIPCONF, &ipconf))
  53                 return 0;       /* Report interface as down. */
  54
  55         addr.sin_addr.s_addr = ipconf.nwic_ipaddr;
  56         netmask.sin_addr.s_addr = ipconf.nwic_netmask;
  57         if(addr.sin_addr.s_addr) ifa.ifa_flags = IFF_UP;
  58
  59         /* Just report on this interface. */
  60
  61         *ifap = &ifa;
  62
  63         return 0;
  64 }
  65
  66 void
  67 freeifaddrs(struct ifaddrs *ifp)
  68 {
  69         /* getifaddrs points to static data, so no need to free. */
  70         ;
  71 }
  72