lib/libc/net/minix/getifaddrs.c

   1 #include <namespace.h>
   2
   3 #include <sys/ioctl.h>
   4 #include <sys/socket.h>
   5 #include <sys/types.h>
   6
   7 #include <net/if.h>
   8 #include <net/gen/in.h>
   9 #include <net/gen/ip_io.h>
  10 #include <net/gen/tcp.h>
  11 #include <net/gen/udp.h>
  12
  13 #include <netinet/in.h>
  14
  15 #include <fcntl.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <stdlib.h>
  19 #include <ifaddrs.h>
  20
  21 #if defined(__weak_alias)
  22 __weak_alias(getifaddrs,_getifaddrs)
  23 __weak_alias(freeifaddrs,_freeifaddrs)
  24 #endif
  25
  26 int
  27 getifaddrs(struct ifaddrs **ifap)
  28 {
  29         static int fd = -1;
  30         nwio_ipconf_t ipconf;
  31         int flags;
  32         static struct ifaddrs ifa;
  33         static struct sockaddr_in addr, netmask;
  34
  35         memset(&ifa, 0, sizeof(ifa));
  36         memset(&addr, 0, sizeof(addr));
  37         memset(&netmask, 0, sizeof(netmask));
  38         ifa.ifa_next = NULL;
  39         ifa.ifa_name = __UNCONST("ip");
  40         addr.sin_family = netmask.sin_family = AF_INET;
  41         ifa.ifa_addr = (struct sockaddr *) &addr;
  42         ifa.ifa_netmask = (struct sockaddr *) &netmask;
  43         addr.sin_addr.s_addr = 0;
  44         netmask.sin_addr.s_addr = 0;
  45
  46         *ifap = NULL;
  47
  48         if(fd < 0) {
  49                 char *ipd;
  50
  51                 if(!(ipd = getenv("IP_DEVICE")))
  52                         ipd = __UNCONST("/dev/ip");
  53                 if((fd = open(ipd, O_RDWR)) < 0)
  54                         return -1;
  55         }
  56
  57         /* Code taken from commands/simple/ifconfig.c. */
  58
  59         if((flags = fcntl(fd, F_GETFL)) < 0 ||
  60            fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0 ||
  61            ioctl(fd, NWIOGIPCONF, &ipconf))
  62                 return 0;       /* Report interface as down. */
  63
  64         addr.sin_addr.s_addr = ipconf.nwic_ipaddr;
  65         netmask.sin_addr.s_addr = ipconf.nwic_netmask;
  66         if(addr.sin_addr.s_addr) ifa.ifa_flags = IFF_UP;
  67
  68         /* Just report on this interface. */
  69
  70         *ifap = &ifa;
  71
  72         return 0;
  73 }
  74
  75 void
  76 freeifaddrs(struct ifaddrs *ifp)
  77 {
  78         /* getifaddrs points to static data, so no need to free. */
  79         ;
  80 }
  81